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Diffstat (limited to 'fs/ocfs2/alloc.c')
| -rw-r--r-- | fs/ocfs2/alloc.c | 7405 |
1 files changed, 7405 insertions, 0 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c new file mode 100644 index 000000000..2d7f76e52 --- /dev/null +++ b/fs/ocfs2/alloc.c @@ -0,0 +1,7405 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * alloc.c + * + * Extent allocs and frees + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/swap.h> +#include <linux/quotaops.h> +#include <linux/blkdev.h> + +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "aops.h" +#include "blockcheck.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "inode.h" +#include "journal.h" +#include "localalloc.h" +#include "suballoc.h" +#include "sysfile.h" +#include "file.h" +#include "super.h" +#include "uptodate.h" +#include "xattr.h" +#include "refcounttree.h" +#include "ocfs2_trace.h" + +#include "buffer_head_io.h" + +enum ocfs2_contig_type { + CONTIG_NONE = 0, + CONTIG_LEFT, + CONTIG_RIGHT, + CONTIG_LEFTRIGHT, +}; + +static enum ocfs2_contig_type + ocfs2_extent_rec_contig(struct super_block *sb, + struct ocfs2_extent_rec *ext, + struct ocfs2_extent_rec *insert_rec); +/* + * Operations for a specific extent tree type. + * + * To implement an on-disk btree (extent tree) type in ocfs2, add + * an ocfs2_extent_tree_operations structure and the matching + * ocfs2_init_<thingy>_extent_tree() function. That's pretty much it + * for the allocation portion of the extent tree. + */ +struct ocfs2_extent_tree_operations { + /* + * last_eb_blk is the block number of the right most leaf extent + * block. Most on-disk structures containing an extent tree store + * this value for fast access. The ->eo_set_last_eb_blk() and + * ->eo_get_last_eb_blk() operations access this value. They are + * both required. + */ + void (*eo_set_last_eb_blk)(struct ocfs2_extent_tree *et, + u64 blkno); + u64 (*eo_get_last_eb_blk)(struct ocfs2_extent_tree *et); + + /* + * The on-disk structure usually keeps track of how many total + * clusters are stored in this extent tree. This function updates + * that value. new_clusters is the delta, and must be + * added to the total. Required. + */ + void (*eo_update_clusters)(struct ocfs2_extent_tree *et, + u32 new_clusters); + + /* + * If this extent tree is supported by an extent map, insert + * a record into the map. + */ + void (*eo_extent_map_insert)(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec); + + /* + * If this extent tree is supported by an extent map, truncate the + * map to clusters, + */ + void (*eo_extent_map_truncate)(struct ocfs2_extent_tree *et, + u32 clusters); + + /* + * If ->eo_insert_check() exists, it is called before rec is + * inserted into the extent tree. It is optional. + */ + int (*eo_insert_check)(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec); + int (*eo_sanity_check)(struct ocfs2_extent_tree *et); + + /* + * -------------------------------------------------------------- + * The remaining are internal to ocfs2_extent_tree and don't have + * accessor functions + */ + + /* + * ->eo_fill_root_el() takes et->et_object and sets et->et_root_el. + * It is required. + */ + void (*eo_fill_root_el)(struct ocfs2_extent_tree *et); + + /* + * ->eo_fill_max_leaf_clusters sets et->et_max_leaf_clusters if + * it exists. If it does not, et->et_max_leaf_clusters is set + * to 0 (unlimited). Optional. + */ + void (*eo_fill_max_leaf_clusters)(struct ocfs2_extent_tree *et); + + /* + * ->eo_extent_contig test whether the 2 ocfs2_extent_rec + * are contiguous or not. Optional. Don't need to set it if use + * ocfs2_extent_rec as the tree leaf. + */ + enum ocfs2_contig_type + (*eo_extent_contig)(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *ext, + struct ocfs2_extent_rec *insert_rec); +}; + + +/* + * Pre-declare ocfs2_dinode_et_ops so we can use it as a sanity check + * in the methods. + */ +static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et); +static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno); +static void ocfs2_dinode_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters); +static void ocfs2_dinode_extent_map_insert(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec); +static void ocfs2_dinode_extent_map_truncate(struct ocfs2_extent_tree *et, + u32 clusters); +static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec); +static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et); +static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et); +static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = { + .eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk, + .eo_update_clusters = ocfs2_dinode_update_clusters, + .eo_extent_map_insert = ocfs2_dinode_extent_map_insert, + .eo_extent_map_truncate = ocfs2_dinode_extent_map_truncate, + .eo_insert_check = ocfs2_dinode_insert_check, + .eo_sanity_check = ocfs2_dinode_sanity_check, + .eo_fill_root_el = ocfs2_dinode_fill_root_el, +}; + +static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno) +{ + struct ocfs2_dinode *di = et->et_object; + + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); + di->i_last_eb_blk = cpu_to_le64(blkno); +} + +static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dinode *di = et->et_object; + + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); + return le64_to_cpu(di->i_last_eb_blk); +} + +static void ocfs2_dinode_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct ocfs2_inode_info *oi = cache_info_to_inode(et->et_ci); + struct ocfs2_dinode *di = et->et_object; + + le32_add_cpu(&di->i_clusters, clusters); + spin_lock(&oi->ip_lock); + oi->ip_clusters = le32_to_cpu(di->i_clusters); + spin_unlock(&oi->ip_lock); +} + +static void ocfs2_dinode_extent_map_insert(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec) +{ + struct inode *inode = &cache_info_to_inode(et->et_ci)->vfs_inode; + + ocfs2_extent_map_insert_rec(inode, rec); +} + +static void ocfs2_dinode_extent_map_truncate(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct inode *inode = &cache_info_to_inode(et->et_ci)->vfs_inode; + + ocfs2_extent_map_trunc(inode, clusters); +} + +static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec) +{ + struct ocfs2_inode_info *oi = cache_info_to_inode(et->et_ci); + struct ocfs2_super *osb = OCFS2_SB(oi->vfs_inode.i_sb); + + BUG_ON(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL); + mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) && + (oi->ip_clusters != le32_to_cpu(rec->e_cpos)), + "Device %s, asking for sparse allocation: inode %llu, " + "cpos %u, clusters %u\n", + osb->dev_str, + (unsigned long long)oi->ip_blkno, + rec->e_cpos, oi->ip_clusters); + + return 0; +} + +static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dinode *di = et->et_object; + + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); + BUG_ON(!OCFS2_IS_VALID_DINODE(di)); + + return 0; +} + +static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dinode *di = et->et_object; + + et->et_root_el = &di->id2.i_list; +} + + +static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_xattr_value_buf *vb = et->et_object; + + et->et_root_el = &vb->vb_xv->xr_list; +} + +static void ocfs2_xattr_value_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno) +{ + struct ocfs2_xattr_value_buf *vb = et->et_object; + + vb->vb_xv->xr_last_eb_blk = cpu_to_le64(blkno); +} + +static u64 ocfs2_xattr_value_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + struct ocfs2_xattr_value_buf *vb = et->et_object; + + return le64_to_cpu(vb->vb_xv->xr_last_eb_blk); +} + +static void ocfs2_xattr_value_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct ocfs2_xattr_value_buf *vb = et->et_object; + + le32_add_cpu(&vb->vb_xv->xr_clusters, clusters); +} + +static struct ocfs2_extent_tree_operations ocfs2_xattr_value_et_ops = { + .eo_set_last_eb_blk = ocfs2_xattr_value_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_xattr_value_get_last_eb_blk, + .eo_update_clusters = ocfs2_xattr_value_update_clusters, + .eo_fill_root_el = ocfs2_xattr_value_fill_root_el, +}; + +static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_xattr_block *xb = et->et_object; + + et->et_root_el = &xb->xb_attrs.xb_root.xt_list; +} + +static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct ocfs2_extent_tree *et) +{ + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + et->et_max_leaf_clusters = + ocfs2_clusters_for_bytes(sb, OCFS2_MAX_XATTR_TREE_LEAF_SIZE); +} + +static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno) +{ + struct ocfs2_xattr_block *xb = et->et_object; + struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; + + xt->xt_last_eb_blk = cpu_to_le64(blkno); +} + +static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + struct ocfs2_xattr_block *xb = et->et_object; + struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; + + return le64_to_cpu(xt->xt_last_eb_blk); +} + +static void ocfs2_xattr_tree_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct ocfs2_xattr_block *xb = et->et_object; + + le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters); +} + +static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = { + .eo_set_last_eb_blk = ocfs2_xattr_tree_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_xattr_tree_get_last_eb_blk, + .eo_update_clusters = ocfs2_xattr_tree_update_clusters, + .eo_fill_root_el = ocfs2_xattr_tree_fill_root_el, + .eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters, +}; + +static void ocfs2_dx_root_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno) +{ + struct ocfs2_dx_root_block *dx_root = et->et_object; + + dx_root->dr_last_eb_blk = cpu_to_le64(blkno); +} + +static u64 ocfs2_dx_root_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dx_root_block *dx_root = et->et_object; + + return le64_to_cpu(dx_root->dr_last_eb_blk); +} + +static void ocfs2_dx_root_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct ocfs2_dx_root_block *dx_root = et->et_object; + + le32_add_cpu(&dx_root->dr_clusters, clusters); +} + +static int ocfs2_dx_root_sanity_check(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dx_root_block *dx_root = et->et_object; + + BUG_ON(!OCFS2_IS_VALID_DX_ROOT(dx_root)); + + return 0; +} + +static void ocfs2_dx_root_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dx_root_block *dx_root = et->et_object; + + et->et_root_el = &dx_root->dr_list; +} + +static struct ocfs2_extent_tree_operations ocfs2_dx_root_et_ops = { + .eo_set_last_eb_blk = ocfs2_dx_root_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_dx_root_get_last_eb_blk, + .eo_update_clusters = ocfs2_dx_root_update_clusters, + .eo_sanity_check = ocfs2_dx_root_sanity_check, + .eo_fill_root_el = ocfs2_dx_root_fill_root_el, +}; + +static void ocfs2_refcount_tree_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_refcount_block *rb = et->et_object; + + et->et_root_el = &rb->rf_list; +} + +static void ocfs2_refcount_tree_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno) +{ + struct ocfs2_refcount_block *rb = et->et_object; + + rb->rf_last_eb_blk = cpu_to_le64(blkno); +} + +static u64 ocfs2_refcount_tree_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + struct ocfs2_refcount_block *rb = et->et_object; + + return le64_to_cpu(rb->rf_last_eb_blk); +} + +static void ocfs2_refcount_tree_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + struct ocfs2_refcount_block *rb = et->et_object; + + le32_add_cpu(&rb->rf_clusters, clusters); +} + +static enum ocfs2_contig_type +ocfs2_refcount_tree_extent_contig(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *ext, + struct ocfs2_extent_rec *insert_rec) +{ + return CONTIG_NONE; +} + +static struct ocfs2_extent_tree_operations ocfs2_refcount_tree_et_ops = { + .eo_set_last_eb_blk = ocfs2_refcount_tree_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_refcount_tree_get_last_eb_blk, + .eo_update_clusters = ocfs2_refcount_tree_update_clusters, + .eo_fill_root_el = ocfs2_refcount_tree_fill_root_el, + .eo_extent_contig = ocfs2_refcount_tree_extent_contig, +}; + +static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct buffer_head *bh, + ocfs2_journal_access_func access, + void *obj, + struct ocfs2_extent_tree_operations *ops) +{ + et->et_ops = ops; + et->et_root_bh = bh; + et->et_ci = ci; + et->et_root_journal_access = access; + if (!obj) + obj = (void *)bh->b_data; + et->et_object = obj; + + et->et_ops->eo_fill_root_el(et); + if (!et->et_ops->eo_fill_max_leaf_clusters) + et->et_max_leaf_clusters = 0; + else + et->et_ops->eo_fill_max_leaf_clusters(et); +} + +void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct buffer_head *bh) +{ + __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_di, + NULL, &ocfs2_dinode_et_ops); +} + +void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct buffer_head *bh) +{ + __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_xb, + NULL, &ocfs2_xattr_tree_et_ops); +} + +void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct ocfs2_xattr_value_buf *vb) +{ + __ocfs2_init_extent_tree(et, ci, vb->vb_bh, vb->vb_access, vb, + &ocfs2_xattr_value_et_ops); +} + +void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct buffer_head *bh) +{ + __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_dr, + NULL, &ocfs2_dx_root_et_ops); +} + +void ocfs2_init_refcount_extent_tree(struct ocfs2_extent_tree *et, + struct ocfs2_caching_info *ci, + struct buffer_head *bh) +{ + __ocfs2_init_extent_tree(et, ci, bh, ocfs2_journal_access_rb, + NULL, &ocfs2_refcount_tree_et_ops); +} + +static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 new_last_eb_blk) +{ + et->et_ops->eo_set_last_eb_blk(et, new_last_eb_blk); +} + +static inline u64 ocfs2_et_get_last_eb_blk(struct ocfs2_extent_tree *et) +{ + return et->et_ops->eo_get_last_eb_blk(et); +} + +static inline void ocfs2_et_update_clusters(struct ocfs2_extent_tree *et, + u32 clusters) +{ + et->et_ops->eo_update_clusters(et, clusters); +} + +static inline void ocfs2_et_extent_map_insert(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec) +{ + if (et->et_ops->eo_extent_map_insert) + et->et_ops->eo_extent_map_insert(et, rec); +} + +static inline void ocfs2_et_extent_map_truncate(struct ocfs2_extent_tree *et, + u32 clusters) +{ + if (et->et_ops->eo_extent_map_truncate) + et->et_ops->eo_extent_map_truncate(et, clusters); +} + +static inline int ocfs2_et_root_journal_access(handle_t *handle, + struct ocfs2_extent_tree *et, + int type) +{ + return et->et_root_journal_access(handle, et->et_ci, et->et_root_bh, + type); +} + +static inline enum ocfs2_contig_type + ocfs2_et_extent_contig(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec, + struct ocfs2_extent_rec *insert_rec) +{ + if (et->et_ops->eo_extent_contig) + return et->et_ops->eo_extent_contig(et, rec, insert_rec); + + return ocfs2_extent_rec_contig( + ocfs2_metadata_cache_get_super(et->et_ci), + rec, insert_rec); +} + +static inline int ocfs2_et_insert_check(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec) +{ + int ret = 0; + + if (et->et_ops->eo_insert_check) + ret = et->et_ops->eo_insert_check(et, rec); + return ret; +} + +static inline int ocfs2_et_sanity_check(struct ocfs2_extent_tree *et) +{ + int ret = 0; + + if (et->et_ops->eo_sanity_check) + ret = et->et_ops->eo_sanity_check(et); + return ret; +} + +static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt, + struct ocfs2_extent_block *eb); +static void ocfs2_adjust_rightmost_records(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_extent_rec *insert_rec); +/* + * Reset the actual path elements so that we can re-use the structure + * to build another path. Generally, this involves freeing the buffer + * heads. + */ +void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root) +{ + int i, start = 0, depth = 0; + struct ocfs2_path_item *node; + + if (keep_root) + start = 1; + + for(i = start; i < path_num_items(path); i++) { + node = &path->p_node[i]; + + brelse(node->bh); + node->bh = NULL; + node->el = NULL; + } + + /* + * Tree depth may change during truncate, or insert. If we're + * keeping the root extent list, then make sure that our path + * structure reflects the proper depth. + */ + if (keep_root) + depth = le16_to_cpu(path_root_el(path)->l_tree_depth); + else + path_root_access(path) = NULL; + + path->p_tree_depth = depth; +} + +void ocfs2_free_path(struct ocfs2_path *path) +{ + if (path) { + ocfs2_reinit_path(path, 0); + kfree(path); + } +} + +/* + * All the elements of src into dest. After this call, src could be freed + * without affecting dest. + * + * Both paths should have the same root. Any non-root elements of dest + * will be freed. + */ +static void ocfs2_cp_path(struct ocfs2_path *dest, struct ocfs2_path *src) +{ + int i; + + BUG_ON(path_root_bh(dest) != path_root_bh(src)); + BUG_ON(path_root_el(dest) != path_root_el(src)); + BUG_ON(path_root_access(dest) != path_root_access(src)); + + ocfs2_reinit_path(dest, 1); + + for(i = 1; i < OCFS2_MAX_PATH_DEPTH; i++) { + dest->p_node[i].bh = src->p_node[i].bh; + dest->p_node[i].el = src->p_node[i].el; + + if (dest->p_node[i].bh) + get_bh(dest->p_node[i].bh); + } +} + +/* + * Make the *dest path the same as src and re-initialize src path to + * have a root only. + */ +static void ocfs2_mv_path(struct ocfs2_path *dest, struct ocfs2_path *src) +{ + int i; + + BUG_ON(path_root_bh(dest) != path_root_bh(src)); + BUG_ON(path_root_access(dest) != path_root_access(src)); + + for(i = 1; i < OCFS2_MAX_PATH_DEPTH; i++) { + brelse(dest->p_node[i].bh); + + dest->p_node[i].bh = src->p_node[i].bh; + dest->p_node[i].el = src->p_node[i].el; + + src->p_node[i].bh = NULL; + src->p_node[i].el = NULL; + } +} + +/* + * Insert an extent block at given index. + * + * This will not take an additional reference on eb_bh. + */ +static inline void ocfs2_path_insert_eb(struct ocfs2_path *path, int index, + struct buffer_head *eb_bh) +{ + struct ocfs2_extent_block *eb = (struct ocfs2_extent_block *)eb_bh->b_data; + + /* + * Right now, no root bh is an extent block, so this helps + * catch code errors with dinode trees. The assertion can be + * safely removed if we ever need to insert extent block + * structures at the root. + */ + BUG_ON(index == 0); + + path->p_node[index].bh = eb_bh; + path->p_node[index].el = &eb->h_list; +} + +static struct ocfs2_path *ocfs2_new_path(struct buffer_head *root_bh, + struct ocfs2_extent_list *root_el, + ocfs2_journal_access_func access) +{ + struct ocfs2_path *path; + + BUG_ON(le16_to_cpu(root_el->l_tree_depth) >= OCFS2_MAX_PATH_DEPTH); + + path = kzalloc(sizeof(*path), GFP_NOFS); + if (path) { + path->p_tree_depth = le16_to_cpu(root_el->l_tree_depth); + get_bh(root_bh); + path_root_bh(path) = root_bh; + path_root_el(path) = root_el; + path_root_access(path) = access; + } + + return path; +} + +struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path) +{ + return ocfs2_new_path(path_root_bh(path), path_root_el(path), + path_root_access(path)); +} + +struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et) +{ + return ocfs2_new_path(et->et_root_bh, et->et_root_el, + et->et_root_journal_access); +} + +/* + * Journal the buffer at depth idx. All idx>0 are extent_blocks, + * otherwise it's the root_access function. + * + * I don't like the way this function's name looks next to + * ocfs2_journal_access_path(), but I don't have a better one. + */ +int ocfs2_path_bh_journal_access(handle_t *handle, + struct ocfs2_caching_info *ci, + struct ocfs2_path *path, + int idx) +{ + ocfs2_journal_access_func access = path_root_access(path); + + if (!access) + access = ocfs2_journal_access; + + if (idx) + access = ocfs2_journal_access_eb; + + return access(handle, ci, path->p_node[idx].bh, + OCFS2_JOURNAL_ACCESS_WRITE); +} + +/* + * Convenience function to journal all components in a path. + */ +int ocfs2_journal_access_path(struct ocfs2_caching_info *ci, + handle_t *handle, + struct ocfs2_path *path) +{ + int i, ret = 0; + + if (!path) + goto out; + + for(i = 0; i < path_num_items(path); i++) { + ret = ocfs2_path_bh_journal_access(handle, ci, path, i); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + +out: + return ret; +} + +/* + * Return the index of the extent record which contains cluster #v_cluster. + * -1 is returned if it was not found. + * + * Should work fine on interior and exterior nodes. + */ +int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster) +{ + int ret = -1; + int i; + struct ocfs2_extent_rec *rec; + u32 rec_end, rec_start, clusters; + + for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { + rec = &el->l_recs[i]; + + rec_start = le32_to_cpu(rec->e_cpos); + clusters = ocfs2_rec_clusters(el, rec); + + rec_end = rec_start + clusters; + + if (v_cluster >= rec_start && v_cluster < rec_end) { + ret = i; + break; + } + } + + return ret; +} + +/* + * NOTE: ocfs2_block_extent_contig(), ocfs2_extents_adjacent() and + * ocfs2_extent_rec_contig only work properly against leaf nodes! + */ +static int ocfs2_block_extent_contig(struct super_block *sb, + struct ocfs2_extent_rec *ext, + u64 blkno) +{ + u64 blk_end = le64_to_cpu(ext->e_blkno); + + blk_end += ocfs2_clusters_to_blocks(sb, + le16_to_cpu(ext->e_leaf_clusters)); + + return blkno == blk_end; +} + +static int ocfs2_extents_adjacent(struct ocfs2_extent_rec *left, + struct ocfs2_extent_rec *right) +{ + u32 left_range; + + left_range = le32_to_cpu(left->e_cpos) + + le16_to_cpu(left->e_leaf_clusters); + + return (left_range == le32_to_cpu(right->e_cpos)); +} + +static enum ocfs2_contig_type + ocfs2_extent_rec_contig(struct super_block *sb, + struct ocfs2_extent_rec *ext, + struct ocfs2_extent_rec *insert_rec) +{ + u64 blkno = le64_to_cpu(insert_rec->e_blkno); + + /* + * Refuse to coalesce extent records with different flag + * fields - we don't want to mix unwritten extents with user + * data. + */ + if (ext->e_flags != insert_rec->e_flags) + return CONTIG_NONE; + + if (ocfs2_extents_adjacent(ext, insert_rec) && + ocfs2_block_extent_contig(sb, ext, blkno)) + return CONTIG_RIGHT; + + blkno = le64_to_cpu(ext->e_blkno); + if (ocfs2_extents_adjacent(insert_rec, ext) && + ocfs2_block_extent_contig(sb, insert_rec, blkno)) + return CONTIG_LEFT; + + return CONTIG_NONE; +} + +/* + * NOTE: We can have pretty much any combination of contiguousness and + * appending. + * + * The usefulness of APPEND_TAIL is more in that it lets us know that + * we'll have to update the path to that leaf. + */ +enum ocfs2_append_type { + APPEND_NONE = 0, + APPEND_TAIL, +}; + +enum ocfs2_split_type { + SPLIT_NONE = 0, + SPLIT_LEFT, + SPLIT_RIGHT, +}; + +struct ocfs2_insert_type { + enum ocfs2_split_type ins_split; + enum ocfs2_append_type ins_appending; + enum ocfs2_contig_type ins_contig; + int ins_contig_index; + int ins_tree_depth; +}; + +struct ocfs2_merge_ctxt { + enum ocfs2_contig_type c_contig_type; + int c_has_empty_extent; + int c_split_covers_rec; +}; + +static int ocfs2_validate_extent_block(struct super_block *sb, + struct buffer_head *bh) +{ + int rc; + struct ocfs2_extent_block *eb = + (struct ocfs2_extent_block *)bh->b_data; + + trace_ocfs2_validate_extent_block((unsigned long long)bh->b_blocknr); + + BUG_ON(!buffer_uptodate(bh)); + + /* + * If the ecc fails, we return the error but otherwise + * leave the filesystem running. We know any error is + * local to this block. + */ + rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &eb->h_check); + if (rc) { + mlog(ML_ERROR, "Checksum failed for extent block %llu\n", + (unsigned long long)bh->b_blocknr); + return rc; + } + + /* + * Errors after here are fatal. + */ + + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + ocfs2_error(sb, + "Extent block #%llu has bad signature %.*s", + (unsigned long long)bh->b_blocknr, 7, + eb->h_signature); + return -EINVAL; + } + + if (le64_to_cpu(eb->h_blkno) != bh->b_blocknr) { + ocfs2_error(sb, + "Extent block #%llu has an invalid h_blkno " + "of %llu", + (unsigned long long)bh->b_blocknr, + (unsigned long long)le64_to_cpu(eb->h_blkno)); + return -EINVAL; + } + + if (le32_to_cpu(eb->h_fs_generation) != OCFS2_SB(sb)->fs_generation) { + ocfs2_error(sb, + "Extent block #%llu has an invalid " + "h_fs_generation of #%u", + (unsigned long long)bh->b_blocknr, + le32_to_cpu(eb->h_fs_generation)); + return -EINVAL; + } + + return 0; +} + +int ocfs2_read_extent_block(struct ocfs2_caching_info *ci, u64 eb_blkno, + struct buffer_head **bh) +{ + int rc; + struct buffer_head *tmp = *bh; + + rc = ocfs2_read_block(ci, eb_blkno, &tmp, + ocfs2_validate_extent_block); + + /* If ocfs2_read_block() got us a new bh, pass it up. */ + if (!rc && !*bh) + *bh = tmp; + + return rc; +} + + +/* + * How many free extents have we got before we need more meta data? + */ +int ocfs2_num_free_extents(struct ocfs2_super *osb, + struct ocfs2_extent_tree *et) +{ + int retval; + struct ocfs2_extent_list *el = NULL; + struct ocfs2_extent_block *eb; + struct buffer_head *eb_bh = NULL; + u64 last_eb_blk = 0; + + el = et->et_root_el; + last_eb_blk = ocfs2_et_get_last_eb_blk(et); + + if (last_eb_blk) { + retval = ocfs2_read_extent_block(et->et_ci, last_eb_blk, + &eb_bh); + if (retval < 0) { + mlog_errno(retval); + goto bail; + } + eb = (struct ocfs2_extent_block *) eb_bh->b_data; + el = &eb->h_list; + } + + BUG_ON(el->l_tree_depth != 0); + + retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec); +bail: + brelse(eb_bh); + + trace_ocfs2_num_free_extents(retval); + return retval; +} + +/* expects array to already be allocated + * + * sets h_signature, h_blkno, h_suballoc_bit, h_suballoc_slot, and + * l_count for you + */ +static int ocfs2_create_new_meta_bhs(handle_t *handle, + struct ocfs2_extent_tree *et, + int wanted, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head *bhs[]) +{ + int count, status, i; + u16 suballoc_bit_start; + u32 num_got; + u64 suballoc_loc, first_blkno; + struct ocfs2_super *osb = + OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci)); + struct ocfs2_extent_block *eb; + + count = 0; + while (count < wanted) { + status = ocfs2_claim_metadata(handle, + meta_ac, + wanted - count, + &suballoc_loc, + &suballoc_bit_start, + &num_got, + &first_blkno); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + for(i = count; i < (num_got + count); i++) { + bhs[i] = sb_getblk(osb->sb, first_blkno); + if (bhs[i] == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + ocfs2_set_new_buffer_uptodate(et->et_ci, bhs[i]); + + status = ocfs2_journal_access_eb(handle, et->et_ci, + bhs[i], + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + memset(bhs[i]->b_data, 0, osb->sb->s_blocksize); + eb = (struct ocfs2_extent_block *) bhs[i]->b_data; + /* Ok, setup the minimal stuff here. */ + strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE); + eb->h_blkno = cpu_to_le64(first_blkno); + eb->h_fs_generation = cpu_to_le32(osb->fs_generation); + eb->h_suballoc_slot = + cpu_to_le16(meta_ac->ac_alloc_slot); + eb->h_suballoc_loc = cpu_to_le64(suballoc_loc); + eb->h_suballoc_bit = cpu_to_le16(suballoc_bit_start); + eb->h_list.l_count = + cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb)); + + suballoc_bit_start++; + first_blkno++; + + /* We'll also be dirtied by the caller, so + * this isn't absolutely necessary. */ + ocfs2_journal_dirty(handle, bhs[i]); + } + + count += num_got; + } + + status = 0; +bail: + if (status < 0) { + for(i = 0; i < wanted; i++) { + brelse(bhs[i]); + bhs[i] = NULL; + } + mlog_errno(status); + } + return status; +} + +/* + * Helper function for ocfs2_add_branch() and ocfs2_shift_tree_depth(). + * + * Returns the sum of the rightmost extent rec logical offset and + * cluster count. + * + * ocfs2_add_branch() uses this to determine what logical cluster + * value should be populated into the leftmost new branch records. + * + * ocfs2_shift_tree_depth() uses this to determine the # clusters + * value for the new topmost tree record. + */ +static inline u32 ocfs2_sum_rightmost_rec(struct ocfs2_extent_list *el) +{ + int i; + + i = le16_to_cpu(el->l_next_free_rec) - 1; + + return le32_to_cpu(el->l_recs[i].e_cpos) + + ocfs2_rec_clusters(el, &el->l_recs[i]); +} + +/* + * Change range of the branches in the right most path according to the leaf + * extent block's rightmost record. + */ +static int ocfs2_adjust_rightmost_branch(handle_t *handle, + struct ocfs2_extent_tree *et) +{ + int status; + struct ocfs2_path *path = NULL; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + + path = ocfs2_new_path_from_et(et); + if (!path) { + status = -ENOMEM; + return status; + } + + status = ocfs2_find_path(et->et_ci, path, UINT_MAX); + if (status < 0) { + mlog_errno(status); + goto out; + } + + status = ocfs2_extend_trans(handle, path_num_items(path)); + if (status < 0) { + mlog_errno(status); + goto out; + } + + status = ocfs2_journal_access_path(et->et_ci, handle, path); + if (status < 0) { + mlog_errno(status); + goto out; + } + + el = path_leaf_el(path); + rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec) - 1]; + + ocfs2_adjust_rightmost_records(handle, et, path, rec); + +out: + ocfs2_free_path(path); + return status; +} + +/* + * Add an entire tree branch to our inode. eb_bh is the extent block + * to start at, if we don't want to start the branch at the root + * structure. + * + * last_eb_bh is required as we have to update it's next_leaf pointer + * for the new last extent block. + * + * the new branch will be 'empty' in the sense that every block will + * contain a single record with cluster count == 0. + */ +static int ocfs2_add_branch(handle_t *handle, + struct ocfs2_extent_tree *et, + struct buffer_head *eb_bh, + struct buffer_head **last_eb_bh, + struct ocfs2_alloc_context *meta_ac) +{ + int status, new_blocks, i; + u64 next_blkno, new_last_eb_blk; + struct buffer_head *bh; + struct buffer_head **new_eb_bhs = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *eb_el; + struct ocfs2_extent_list *el; + u32 new_cpos, root_end; + + BUG_ON(!last_eb_bh || !*last_eb_bh); + + if (eb_bh) { + eb = (struct ocfs2_extent_block *) eb_bh->b_data; + el = &eb->h_list; + } else + el = et->et_root_el; + + /* we never add a branch to a leaf. */ + BUG_ON(!el->l_tree_depth); + + new_blocks = le16_to_cpu(el->l_tree_depth); + + eb = (struct ocfs2_extent_block *)(*last_eb_bh)->b_data; + new_cpos = ocfs2_sum_rightmost_rec(&eb->h_list); + root_end = ocfs2_sum_rightmost_rec(et->et_root_el); + + /* + * If there is a gap before the root end and the real end + * of the righmost leaf block, we need to remove the gap + * between new_cpos and root_end first so that the tree + * is consistent after we add a new branch(it will start + * from new_cpos). + */ + if (root_end > new_cpos) { + trace_ocfs2_adjust_rightmost_branch( + (unsigned long long) + ocfs2_metadata_cache_owner(et->et_ci), + root_end, new_cpos); + + status = ocfs2_adjust_rightmost_branch(handle, et); + if (status) { + mlog_errno(status); + goto bail; + } + } + + /* allocate the number of new eb blocks we need */ + new_eb_bhs = kcalloc(new_blocks, sizeof(struct buffer_head *), + GFP_KERNEL); + if (!new_eb_bhs) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + status = ocfs2_create_new_meta_bhs(handle, et, new_blocks, + meta_ac, new_eb_bhs); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* Note: new_eb_bhs[new_blocks - 1] is the guy which will be + * linked with the rest of the tree. + * conversly, new_eb_bhs[0] is the new bottommost leaf. + * + * when we leave the loop, new_last_eb_blk will point to the + * newest leaf, and next_blkno will point to the topmost extent + * block. */ + next_blkno = new_last_eb_blk = 0; + for(i = 0; i < new_blocks; i++) { + bh = new_eb_bhs[i]; + eb = (struct ocfs2_extent_block *) bh->b_data; + /* ocfs2_create_new_meta_bhs() should create it right! */ + BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb)); + eb_el = &eb->h_list; + + status = ocfs2_journal_access_eb(handle, et->et_ci, bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb->h_next_leaf_blk = 0; + eb_el->l_tree_depth = cpu_to_le16(i); + eb_el->l_next_free_rec = cpu_to_le16(1); + /* + * This actually counts as an empty extent as + * c_clusters == 0 + */ + eb_el->l_recs[0].e_cpos = cpu_to_le32(new_cpos); + eb_el->l_recs[0].e_blkno = cpu_to_le64(next_blkno); + /* + * eb_el isn't always an interior node, but even leaf + * nodes want a zero'd flags and reserved field so + * this gets the whole 32 bits regardless of use. + */ + eb_el->l_recs[0].e_int_clusters = cpu_to_le32(0); + if (!eb_el->l_tree_depth) + new_last_eb_blk = le64_to_cpu(eb->h_blkno); + + ocfs2_journal_dirty(handle, bh); + next_blkno = le64_to_cpu(eb->h_blkno); + } + + /* This is a bit hairy. We want to update up to three blocks + * here without leaving any of them in an inconsistent state + * in case of error. We don't have to worry about + * journal_dirty erroring as it won't unless we've aborted the + * handle (in which case we would never be here) so reserving + * the write with journal_access is all we need to do. */ + status = ocfs2_journal_access_eb(handle, et->et_ci, *last_eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + status = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + if (eb_bh) { + status = ocfs2_journal_access_eb(handle, et->et_ci, eb_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* Link the new branch into the rest of the tree (el will + * either be on the root_bh, or the extent block passed in. */ + i = le16_to_cpu(el->l_next_free_rec); + el->l_recs[i].e_blkno = cpu_to_le64(next_blkno); + el->l_recs[i].e_cpos = cpu_to_le32(new_cpos); + el->l_recs[i].e_int_clusters = 0; + le16_add_cpu(&el->l_next_free_rec, 1); + + /* fe needs a new last extent block pointer, as does the + * next_leaf on the previously last-extent-block. */ + ocfs2_et_set_last_eb_blk(et, new_last_eb_blk); + + eb = (struct ocfs2_extent_block *) (*last_eb_bh)->b_data; + eb->h_next_leaf_blk = cpu_to_le64(new_last_eb_blk); + + ocfs2_journal_dirty(handle, *last_eb_bh); + ocfs2_journal_dirty(handle, et->et_root_bh); + if (eb_bh) + ocfs2_journal_dirty(handle, eb_bh); + + /* + * Some callers want to track the rightmost leaf so pass it + * back here. + */ + brelse(*last_eb_bh); + get_bh(new_eb_bhs[0]); + *last_eb_bh = new_eb_bhs[0]; + + status = 0; +bail: + if (new_eb_bhs) { + for (i = 0; i < new_blocks; i++) + brelse(new_eb_bhs[i]); + kfree(new_eb_bhs); + } + + return status; +} + +/* + * adds another level to the allocation tree. + * returns back the new extent block so you can add a branch to it + * after this call. + */ +static int ocfs2_shift_tree_depth(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_alloc_context *meta_ac, + struct buffer_head **ret_new_eb_bh) +{ + int status, i; + u32 new_clusters; + struct buffer_head *new_eb_bh = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *root_el; + struct ocfs2_extent_list *eb_el; + + status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac, + &new_eb_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb = (struct ocfs2_extent_block *) new_eb_bh->b_data; + /* ocfs2_create_new_meta_bhs() should create it right! */ + BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb)); + + eb_el = &eb->h_list; + root_el = et->et_root_el; + + status = ocfs2_journal_access_eb(handle, et->et_ci, new_eb_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* copy the root extent list data into the new extent block */ + eb_el->l_tree_depth = root_el->l_tree_depth; + eb_el->l_next_free_rec = root_el->l_next_free_rec; + for (i = 0; i < le16_to_cpu(root_el->l_next_free_rec); i++) + eb_el->l_recs[i] = root_el->l_recs[i]; + + ocfs2_journal_dirty(handle, new_eb_bh); + + status = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + new_clusters = ocfs2_sum_rightmost_rec(eb_el); + + /* update root_bh now */ + le16_add_cpu(&root_el->l_tree_depth, 1); + root_el->l_recs[0].e_cpos = 0; + root_el->l_recs[0].e_blkno = eb->h_blkno; + root_el->l_recs[0].e_int_clusters = cpu_to_le32(new_clusters); + for (i = 1; i < le16_to_cpu(root_el->l_next_free_rec); i++) + memset(&root_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec)); + root_el->l_next_free_rec = cpu_to_le16(1); + + /* If this is our 1st tree depth shift, then last_eb_blk + * becomes the allocated extent block */ + if (root_el->l_tree_depth == cpu_to_le16(1)) + ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno)); + + ocfs2_journal_dirty(handle, et->et_root_bh); + + *ret_new_eb_bh = new_eb_bh; + new_eb_bh = NULL; + status = 0; +bail: + brelse(new_eb_bh); + + return status; +} + +/* + * Should only be called when there is no space left in any of the + * leaf nodes. What we want to do is find the lowest tree depth + * non-leaf extent block with room for new records. There are three + * valid results of this search: + * + * 1) a lowest extent block is found, then we pass it back in + * *lowest_eb_bh and return '0' + * + * 2) the search fails to find anything, but the root_el has room. We + * pass NULL back in *lowest_eb_bh, but still return '0' + * + * 3) the search fails to find anything AND the root_el is full, in + * which case we return > 0 + * + * return status < 0 indicates an error. + */ +static int ocfs2_find_branch_target(struct ocfs2_extent_tree *et, + struct buffer_head **target_bh) +{ + int status = 0, i; + u64 blkno; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *bh = NULL; + struct buffer_head *lowest_bh = NULL; + + *target_bh = NULL; + + el = et->et_root_el; + + while(le16_to_cpu(el->l_tree_depth) > 1) { + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has empty " + "extent list (next_free_rec == 0)", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci)); + status = -EIO; + goto bail; + } + i = le16_to_cpu(el->l_next_free_rec) - 1; + blkno = le64_to_cpu(el->l_recs[i].e_blkno); + if (!blkno) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has extent " + "list where extent # %d has no physical " + "block start", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), i); + status = -EIO; + goto bail; + } + + brelse(bh); + bh = NULL; + + status = ocfs2_read_extent_block(et->et_ci, blkno, &bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + eb = (struct ocfs2_extent_block *) bh->b_data; + el = &eb->h_list; + + if (le16_to_cpu(el->l_next_free_rec) < + le16_to_cpu(el->l_count)) { + brelse(lowest_bh); + lowest_bh = bh; + get_bh(lowest_bh); + } + } + + /* If we didn't find one and the fe doesn't have any room, + * then return '1' */ + el = et->et_root_el; + if (!lowest_bh && (el->l_next_free_rec == el->l_count)) + status = 1; + + *target_bh = lowest_bh; +bail: + brelse(bh); + + return status; +} + +/* + * Grow a b-tree so that it has more records. + * + * We might shift the tree depth in which case existing paths should + * be considered invalid. + * + * Tree depth after the grow is returned via *final_depth. + * + * *last_eb_bh will be updated by ocfs2_add_branch(). + */ +static int ocfs2_grow_tree(handle_t *handle, struct ocfs2_extent_tree *et, + int *final_depth, struct buffer_head **last_eb_bh, + struct ocfs2_alloc_context *meta_ac) +{ + int ret, shift; + struct ocfs2_extent_list *el = et->et_root_el; + int depth = le16_to_cpu(el->l_tree_depth); + struct buffer_head *bh = NULL; + + BUG_ON(meta_ac == NULL); + + shift = ocfs2_find_branch_target(et, &bh); + if (shift < 0) { + ret = shift; + mlog_errno(ret); + goto out; + } + + /* We traveled all the way to the bottom of the allocation tree + * and didn't find room for any more extents - we need to add + * another tree level */ + if (shift) { + BUG_ON(bh); + trace_ocfs2_grow_tree( + (unsigned long long) + ocfs2_metadata_cache_owner(et->et_ci), + depth); + + /* ocfs2_shift_tree_depth will return us a buffer with + * the new extent block (so we can pass that to + * ocfs2_add_branch). */ + ret = ocfs2_shift_tree_depth(handle, et, meta_ac, &bh); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + depth++; + if (depth == 1) { + /* + * Special case: we have room now if we shifted from + * tree_depth 0, so no more work needs to be done. + * + * We won't be calling add_branch, so pass + * back *last_eb_bh as the new leaf. At depth + * zero, it should always be null so there's + * no reason to brelse. + */ + BUG_ON(*last_eb_bh); + get_bh(bh); + *last_eb_bh = bh; + goto out; + } + } + + /* call ocfs2_add_branch to add the final part of the tree with + * the new data. */ + ret = ocfs2_add_branch(handle, et, bh, last_eb_bh, + meta_ac); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + +out: + if (final_depth) + *final_depth = depth; + brelse(bh); + return ret; +} + +/* + * This function will discard the rightmost extent record. + */ +static void ocfs2_shift_records_right(struct ocfs2_extent_list *el) +{ + int next_free = le16_to_cpu(el->l_next_free_rec); + int count = le16_to_cpu(el->l_count); + unsigned int num_bytes; + + BUG_ON(!next_free); + /* This will cause us to go off the end of our extent list. */ + BUG_ON(next_free >= count); + + num_bytes = sizeof(struct ocfs2_extent_rec) * next_free; + + memmove(&el->l_recs[1], &el->l_recs[0], num_bytes); +} + +static void ocfs2_rotate_leaf(struct ocfs2_extent_list *el, + struct ocfs2_extent_rec *insert_rec) +{ + int i, insert_index, next_free, has_empty, num_bytes; + u32 insert_cpos = le32_to_cpu(insert_rec->e_cpos); + struct ocfs2_extent_rec *rec; + + next_free = le16_to_cpu(el->l_next_free_rec); + has_empty = ocfs2_is_empty_extent(&el->l_recs[0]); + + BUG_ON(!next_free); + + /* The tree code before us didn't allow enough room in the leaf. */ + BUG_ON(el->l_next_free_rec == el->l_count && !has_empty); + + /* + * The easiest way to approach this is to just remove the + * empty extent and temporarily decrement next_free. + */ + if (has_empty) { + /* + * If next_free was 1 (only an empty extent), this + * loop won't execute, which is fine. We still want + * the decrement above to happen. + */ + for(i = 0; i < (next_free - 1); i++) + el->l_recs[i] = el->l_recs[i+1]; + + next_free--; + } + + /* + * Figure out what the new record index should be. + */ + for(i = 0; i < next_free; i++) { + rec = &el->l_recs[i]; + + if (insert_cpos < le32_to_cpu(rec->e_cpos)) + break; + } + insert_index = i; + + trace_ocfs2_rotate_leaf(insert_cpos, insert_index, + has_empty, next_free, + le16_to_cpu(el->l_count)); + + BUG_ON(insert_index < 0); + BUG_ON(insert_index >= le16_to_cpu(el->l_count)); + BUG_ON(insert_index > next_free); + + /* + * No need to memmove if we're just adding to the tail. + */ + if (insert_index != next_free) { + BUG_ON(next_free >= le16_to_cpu(el->l_count)); + + num_bytes = next_free - insert_index; + num_bytes *= sizeof(struct ocfs2_extent_rec); + memmove(&el->l_recs[insert_index + 1], + &el->l_recs[insert_index], + num_bytes); + } + + /* + * Either we had an empty extent, and need to re-increment or + * there was no empty extent on a non full rightmost leaf node, + * in which case we still need to increment. + */ + next_free++; + el->l_next_free_rec = cpu_to_le16(next_free); + /* + * Make sure none of the math above just messed up our tree. + */ + BUG_ON(le16_to_cpu(el->l_next_free_rec) > le16_to_cpu(el->l_count)); + + el->l_recs[insert_index] = *insert_rec; + +} + +static void ocfs2_remove_empty_extent(struct ocfs2_extent_list *el) +{ + int size, num_recs = le16_to_cpu(el->l_next_free_rec); + + BUG_ON(num_recs == 0); + + if (ocfs2_is_empty_extent(&el->l_recs[0])) { + num_recs--; + size = num_recs * sizeof(struct ocfs2_extent_rec); + memmove(&el->l_recs[0], &el->l_recs[1], size); + memset(&el->l_recs[num_recs], 0, + sizeof(struct ocfs2_extent_rec)); + el->l_next_free_rec = cpu_to_le16(num_recs); + } +} + +/* + * Create an empty extent record . + * + * l_next_free_rec may be updated. + * + * If an empty extent already exists do nothing. + */ +static void ocfs2_create_empty_extent(struct ocfs2_extent_list *el) +{ + int next_free = le16_to_cpu(el->l_next_free_rec); + + BUG_ON(le16_to_cpu(el->l_tree_depth) != 0); + + if (next_free == 0) + goto set_and_inc; + + if (ocfs2_is_empty_extent(&el->l_recs[0])) + return; + + mlog_bug_on_msg(el->l_count == el->l_next_free_rec, + "Asked to create an empty extent in a full list:\n" + "count = %u, tree depth = %u", + le16_to_cpu(el->l_count), + le16_to_cpu(el->l_tree_depth)); + + ocfs2_shift_records_right(el); + +set_and_inc: + le16_add_cpu(&el->l_next_free_rec, 1); + memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec)); +} + +/* + * For a rotation which involves two leaf nodes, the "root node" is + * the lowest level tree node which contains a path to both leafs. This + * resulting set of information can be used to form a complete "subtree" + * + * This function is passed two full paths from the dinode down to a + * pair of adjacent leaves. It's task is to figure out which path + * index contains the subtree root - this can be the root index itself + * in a worst-case rotation. + * + * The array index of the subtree root is passed back. + */ +int ocfs2_find_subtree_root(struct ocfs2_extent_tree *et, + struct ocfs2_path *left, + struct ocfs2_path *right) +{ + int i = 0; + + /* + * Check that the caller passed in two paths from the same tree. + */ + BUG_ON(path_root_bh(left) != path_root_bh(right)); + + do { + i++; + + /* + * The caller didn't pass two adjacent paths. + */ + mlog_bug_on_msg(i > left->p_tree_depth, + "Owner %llu, left depth %u, right depth %u\n" + "left leaf blk %llu, right leaf blk %llu\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + left->p_tree_depth, right->p_tree_depth, + (unsigned long long)path_leaf_bh(left)->b_blocknr, + (unsigned long long)path_leaf_bh(right)->b_blocknr); + } while (left->p_node[i].bh->b_blocknr == + right->p_node[i].bh->b_blocknr); + + return i - 1; +} + +typedef void (path_insert_t)(void *, struct buffer_head *); + +/* + * Traverse a btree path in search of cpos, starting at root_el. + * + * This code can be called with a cpos larger than the tree, in which + * case it will return the rightmost path. + */ +static int __ocfs2_find_path(struct ocfs2_caching_info *ci, + struct ocfs2_extent_list *root_el, u32 cpos, + path_insert_t *func, void *data) +{ + int i, ret = 0; + u32 range; + u64 blkno; + struct buffer_head *bh = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + + el = root_el; + while (el->l_tree_depth) { + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ocfs2_error(ocfs2_metadata_cache_get_super(ci), + "Owner %llu has empty extent list at " + "depth %u\n", + (unsigned long long)ocfs2_metadata_cache_owner(ci), + le16_to_cpu(el->l_tree_depth)); + ret = -EROFS; + goto out; + + } + + for(i = 0; i < le16_to_cpu(el->l_next_free_rec) - 1; i++) { + rec = &el->l_recs[i]; + + /* + * In the case that cpos is off the allocation + * tree, this should just wind up returning the + * rightmost record. + */ + range = le32_to_cpu(rec->e_cpos) + + ocfs2_rec_clusters(el, rec); + if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range) + break; + } + + blkno = le64_to_cpu(el->l_recs[i].e_blkno); + if (blkno == 0) { + ocfs2_error(ocfs2_metadata_cache_get_super(ci), + "Owner %llu has bad blkno in extent list " + "at depth %u (index %d)\n", + (unsigned long long)ocfs2_metadata_cache_owner(ci), + le16_to_cpu(el->l_tree_depth), i); + ret = -EROFS; + goto out; + } + + brelse(bh); + bh = NULL; + ret = ocfs2_read_extent_block(ci, blkno, &bh); + if (ret) { + mlog_errno(ret); + goto out; + } + + eb = (struct ocfs2_extent_block *) bh->b_data; + el = &eb->h_list; + + if (le16_to_cpu(el->l_next_free_rec) > + le16_to_cpu(el->l_count)) { + ocfs2_error(ocfs2_metadata_cache_get_super(ci), + "Owner %llu has bad count in extent list " + "at block %llu (next free=%u, count=%u)\n", + (unsigned long long)ocfs2_metadata_cache_owner(ci), + (unsigned long long)bh->b_blocknr, + le16_to_cpu(el->l_next_free_rec), + le16_to_cpu(el->l_count)); + ret = -EROFS; + goto out; + } + + if (func) + func(data, bh); + } + +out: + /* + * Catch any trailing bh that the loop didn't handle. + */ + brelse(bh); + + return ret; +} + +/* + * Given an initialized path (that is, it has a valid root extent + * list), this function will traverse the btree in search of the path + * which would contain cpos. + * + * The path traveled is recorded in the path structure. + * + * Note that this will not do any comparisons on leaf node extent + * records, so it will work fine in the case that we just added a tree + * branch. + */ +struct find_path_data { + int index; + struct ocfs2_path *path; +}; +static void find_path_ins(void *data, struct buffer_head *bh) +{ + struct find_path_data *fp = data; + + get_bh(bh); + ocfs2_path_insert_eb(fp->path, fp->index, bh); + fp->index++; +} +int ocfs2_find_path(struct ocfs2_caching_info *ci, + struct ocfs2_path *path, u32 cpos) +{ + struct find_path_data data; + + data.index = 1; + data.path = path; + return __ocfs2_find_path(ci, path_root_el(path), cpos, + find_path_ins, &data); +} + +static void find_leaf_ins(void *data, struct buffer_head *bh) +{ + struct ocfs2_extent_block *eb =(struct ocfs2_extent_block *)bh->b_data; + struct ocfs2_extent_list *el = &eb->h_list; + struct buffer_head **ret = data; + + /* We want to retain only the leaf block. */ + if (le16_to_cpu(el->l_tree_depth) == 0) { + get_bh(bh); + *ret = bh; + } +} +/* + * Find the leaf block in the tree which would contain cpos. No + * checking of the actual leaf is done. + * + * Some paths want to call this instead of allocating a path structure + * and calling ocfs2_find_path(). + * + * This function doesn't handle non btree extent lists. + */ +int ocfs2_find_leaf(struct ocfs2_caching_info *ci, + struct ocfs2_extent_list *root_el, u32 cpos, + struct buffer_head **leaf_bh) +{ + int ret; + struct buffer_head *bh = NULL; + + ret = __ocfs2_find_path(ci, root_el, cpos, find_leaf_ins, &bh); + if (ret) { + mlog_errno(ret); + goto out; + } + + *leaf_bh = bh; +out: + return ret; +} + +/* + * Adjust the adjacent records (left_rec, right_rec) involved in a rotation. + * + * Basically, we've moved stuff around at the bottom of the tree and + * we need to fix up the extent records above the changes to reflect + * the new changes. + * + * left_rec: the record on the left. + * left_child_el: is the child list pointed to by left_rec + * right_rec: the record to the right of left_rec + * right_child_el: is the child list pointed to by right_rec + * + * By definition, this only works on interior nodes. + */ +static void ocfs2_adjust_adjacent_records(struct ocfs2_extent_rec *left_rec, + struct ocfs2_extent_list *left_child_el, + struct ocfs2_extent_rec *right_rec, + struct ocfs2_extent_list *right_child_el) +{ + u32 left_clusters, right_end; + + /* + * Interior nodes never have holes. Their cpos is the cpos of + * the leftmost record in their child list. Their cluster + * count covers the full theoretical range of their child list + * - the range between their cpos and the cpos of the record + * immediately to their right. + */ + left_clusters = le32_to_cpu(right_child_el->l_recs[0].e_cpos); + if (!ocfs2_rec_clusters(right_child_el, &right_child_el->l_recs[0])) { + BUG_ON(right_child_el->l_tree_depth); + BUG_ON(le16_to_cpu(right_child_el->l_next_free_rec) <= 1); + left_clusters = le32_to_cpu(right_child_el->l_recs[1].e_cpos); + } + left_clusters -= le32_to_cpu(left_rec->e_cpos); + left_rec->e_int_clusters = cpu_to_le32(left_clusters); + + /* + * Calculate the rightmost cluster count boundary before + * moving cpos - we will need to adjust clusters after + * updating e_cpos to keep the same highest cluster count. + */ + right_end = le32_to_cpu(right_rec->e_cpos); + right_end += le32_to_cpu(right_rec->e_int_clusters); + + right_rec->e_cpos = left_rec->e_cpos; + le32_add_cpu(&right_rec->e_cpos, left_clusters); + + right_end -= le32_to_cpu(right_rec->e_cpos); + right_rec->e_int_clusters = cpu_to_le32(right_end); +} + +/* + * Adjust the adjacent root node records involved in a + * rotation. left_el_blkno is passed in as a key so that we can easily + * find it's index in the root list. + */ +static void ocfs2_adjust_root_records(struct ocfs2_extent_list *root_el, + struct ocfs2_extent_list *left_el, + struct ocfs2_extent_list *right_el, + u64 left_el_blkno) +{ + int i; + + BUG_ON(le16_to_cpu(root_el->l_tree_depth) <= + le16_to_cpu(left_el->l_tree_depth)); + + for(i = 0; i < le16_to_cpu(root_el->l_next_free_rec) - 1; i++) { + if (le64_to_cpu(root_el->l_recs[i].e_blkno) == left_el_blkno) + break; + } + + /* + * The path walking code should have never returned a root and + * two paths which are not adjacent. + */ + BUG_ON(i >= (le16_to_cpu(root_el->l_next_free_rec) - 1)); + + ocfs2_adjust_adjacent_records(&root_el->l_recs[i], left_el, + &root_el->l_recs[i + 1], right_el); +} + +/* + * We've changed a leaf block (in right_path) and need to reflect that + * change back up the subtree. + * + * This happens in multiple places: + * - When we've moved an extent record from the left path leaf to the right + * path leaf to make room for an empty extent in the left path leaf. + * - When our insert into the right path leaf is at the leftmost edge + * and requires an update of the path immediately to it's left. This + * can occur at the end of some types of rotation and appending inserts. + * - When we've adjusted the last extent record in the left path leaf and the + * 1st extent record in the right path leaf during cross extent block merge. + */ +static void ocfs2_complete_edge_insert(handle_t *handle, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + int subtree_index) +{ + int i, idx; + struct ocfs2_extent_list *el, *left_el, *right_el; + struct ocfs2_extent_rec *left_rec, *right_rec; + struct buffer_head *root_bh = left_path->p_node[subtree_index].bh; + + /* + * Update the counts and position values within all the + * interior nodes to reflect the leaf rotation we just did. + * + * The root node is handled below the loop. + * + * We begin the loop with right_el and left_el pointing to the + * leaf lists and work our way up. + * + * NOTE: within this loop, left_el and right_el always refer + * to the *child* lists. + */ + left_el = path_leaf_el(left_path); + right_el = path_leaf_el(right_path); + for(i = left_path->p_tree_depth - 1; i > subtree_index; i--) { + trace_ocfs2_complete_edge_insert(i); + + /* + * One nice property of knowing that all of these + * nodes are below the root is that we only deal with + * the leftmost right node record and the rightmost + * left node record. + */ + el = left_path->p_node[i].el; + idx = le16_to_cpu(left_el->l_next_free_rec) - 1; + left_rec = &el->l_recs[idx]; + + el = right_path->p_node[i].el; + right_rec = &el->l_recs[0]; + + ocfs2_adjust_adjacent_records(left_rec, left_el, right_rec, + right_el); + + ocfs2_journal_dirty(handle, left_path->p_node[i].bh); + ocfs2_journal_dirty(handle, right_path->p_node[i].bh); + + /* + * Setup our list pointers now so that the current + * parents become children in the next iteration. + */ + left_el = left_path->p_node[i].el; + right_el = right_path->p_node[i].el; + } + + /* + * At the root node, adjust the two adjacent records which + * begin our path to the leaves. + */ + + el = left_path->p_node[subtree_index].el; + left_el = left_path->p_node[subtree_index + 1].el; + right_el = right_path->p_node[subtree_index + 1].el; + + ocfs2_adjust_root_records(el, left_el, right_el, + left_path->p_node[subtree_index + 1].bh->b_blocknr); + + root_bh = left_path->p_node[subtree_index].bh; + + ocfs2_journal_dirty(handle, root_bh); +} + +static int ocfs2_rotate_subtree_right(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + int subtree_index) +{ + int ret, i; + struct buffer_head *right_leaf_bh; + struct buffer_head *left_leaf_bh = NULL; + struct buffer_head *root_bh; + struct ocfs2_extent_list *right_el, *left_el; + struct ocfs2_extent_rec move_rec; + + left_leaf_bh = path_leaf_bh(left_path); + left_el = path_leaf_el(left_path); + + if (left_el->l_next_free_rec != left_el->l_count) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Inode %llu has non-full interior leaf node %llu" + "(next free = %u)", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + (unsigned long long)left_leaf_bh->b_blocknr, + le16_to_cpu(left_el->l_next_free_rec)); + return -EROFS; + } + + /* + * This extent block may already have an empty record, so we + * return early if so. + */ + if (ocfs2_is_empty_extent(&left_el->l_recs[0])) + return 0; + + root_bh = left_path->p_node[subtree_index].bh; + BUG_ON(root_bh != right_path->p_node[subtree_index].bh); + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path, + subtree_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + for(i = subtree_index + 1; i < path_num_items(right_path); i++) { + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + right_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + left_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + right_leaf_bh = path_leaf_bh(right_path); + right_el = path_leaf_el(right_path); + + /* This is a code error, not a disk corruption. */ + mlog_bug_on_msg(!right_el->l_next_free_rec, "Inode %llu: Rotate fails " + "because rightmost leaf block %llu is empty\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + (unsigned long long)right_leaf_bh->b_blocknr); + + ocfs2_create_empty_extent(right_el); + + ocfs2_journal_dirty(handle, right_leaf_bh); + + /* Do the copy now. */ + i = le16_to_cpu(left_el->l_next_free_rec) - 1; + move_rec = left_el->l_recs[i]; + right_el->l_recs[0] = move_rec; + + /* + * Clear out the record we just copied and shift everything + * over, leaving an empty extent in the left leaf. + * + * We temporarily subtract from next_free_rec so that the + * shift will lose the tail record (which is now defunct). + */ + le16_add_cpu(&left_el->l_next_free_rec, -1); + ocfs2_shift_records_right(left_el); + memset(&left_el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec)); + le16_add_cpu(&left_el->l_next_free_rec, 1); + + ocfs2_journal_dirty(handle, left_leaf_bh); + + ocfs2_complete_edge_insert(handle, left_path, right_path, + subtree_index); + +out: + return ret; +} + +/* + * Given a full path, determine what cpos value would return us a path + * containing the leaf immediately to the left of the current one. + * + * Will return zero if the path passed in is already the leftmost path. + */ +int ocfs2_find_cpos_for_left_leaf(struct super_block *sb, + struct ocfs2_path *path, u32 *cpos) +{ + int i, j, ret = 0; + u64 blkno; + struct ocfs2_extent_list *el; + + BUG_ON(path->p_tree_depth == 0); + + *cpos = 0; + + blkno = path_leaf_bh(path)->b_blocknr; + + /* Start at the tree node just above the leaf and work our way up. */ + i = path->p_tree_depth - 1; + while (i >= 0) { + el = path->p_node[i].el; + + /* + * Find the extent record just before the one in our + * path. + */ + for(j = 0; j < le16_to_cpu(el->l_next_free_rec); j++) { + if (le64_to_cpu(el->l_recs[j].e_blkno) == blkno) { + if (j == 0) { + if (i == 0) { + /* + * We've determined that the + * path specified is already + * the leftmost one - return a + * cpos of zero. + */ + goto out; + } + /* + * The leftmost record points to our + * leaf - we need to travel up the + * tree one level. + */ + goto next_node; + } + + *cpos = le32_to_cpu(el->l_recs[j - 1].e_cpos); + *cpos = *cpos + ocfs2_rec_clusters(el, + &el->l_recs[j - 1]); + *cpos = *cpos - 1; + goto out; + } + } + + /* + * If we got here, we never found a valid node where + * the tree indicated one should be. + */ + ocfs2_error(sb, + "Invalid extent tree at extent block %llu\n", + (unsigned long long)blkno); + ret = -EROFS; + goto out; + +next_node: + blkno = path->p_node[i].bh->b_blocknr; + i--; + } + +out: + return ret; +} + +/* + * Extend the transaction by enough credits to complete the rotation, + * and still leave at least the original number of credits allocated + * to this transaction. + */ +static int ocfs2_extend_rotate_transaction(handle_t *handle, int subtree_depth, + int op_credits, + struct ocfs2_path *path) +{ + int ret = 0; + int credits = (path->p_tree_depth - subtree_depth) * 2 + 1 + op_credits; + + if (handle->h_buffer_credits < credits) + ret = ocfs2_extend_trans(handle, + credits - handle->h_buffer_credits); + + return ret; +} + +/* + * Trap the case where we're inserting into the theoretical range past + * the _actual_ left leaf range. Otherwise, we'll rotate a record + * whose cpos is less than ours into the right leaf. + * + * It's only necessary to look at the rightmost record of the left + * leaf because the logic that calls us should ensure that the + * theoretical ranges in the path components above the leaves are + * correct. + */ +static int ocfs2_rotate_requires_path_adjustment(struct ocfs2_path *left_path, + u32 insert_cpos) +{ + struct ocfs2_extent_list *left_el; + struct ocfs2_extent_rec *rec; + int next_free; + + left_el = path_leaf_el(left_path); + next_free = le16_to_cpu(left_el->l_next_free_rec); + rec = &left_el->l_recs[next_free - 1]; + + if (insert_cpos > le32_to_cpu(rec->e_cpos)) + return 1; + return 0; +} + +static int ocfs2_leftmost_rec_contains(struct ocfs2_extent_list *el, u32 cpos) +{ + int next_free = le16_to_cpu(el->l_next_free_rec); + unsigned int range; + struct ocfs2_extent_rec *rec; + + if (next_free == 0) + return 0; + + rec = &el->l_recs[0]; + if (ocfs2_is_empty_extent(rec)) { + /* Empty list. */ + if (next_free == 1) + return 0; + rec = &el->l_recs[1]; + } + + range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); + if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range) + return 1; + return 0; +} + +/* + * Rotate all the records in a btree right one record, starting at insert_cpos. + * + * The path to the rightmost leaf should be passed in. + * + * The array is assumed to be large enough to hold an entire path (tree depth). + * + * Upon successful return from this function: + * + * - The 'right_path' array will contain a path to the leaf block + * whose range contains e_cpos. + * - That leaf block will have a single empty extent in list index 0. + * - In the case that the rotation requires a post-insert update, + * *ret_left_path will contain a valid path which can be passed to + * ocfs2_insert_path(). + */ +static int ocfs2_rotate_tree_right(handle_t *handle, + struct ocfs2_extent_tree *et, + enum ocfs2_split_type split, + u32 insert_cpos, + struct ocfs2_path *right_path, + struct ocfs2_path **ret_left_path) +{ + int ret, start, orig_credits = handle->h_buffer_credits; + u32 cpos; + struct ocfs2_path *left_path = NULL; + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + + *ret_left_path = NULL; + + left_path = ocfs2_new_path_from_path(right_path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_cpos_for_left_leaf(sb, right_path, &cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + trace_ocfs2_rotate_tree_right( + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + insert_cpos, cpos); + + /* + * What we want to do here is: + * + * 1) Start with the rightmost path. + * + * 2) Determine a path to the leaf block directly to the left + * of that leaf. + * + * 3) Determine the 'subtree root' - the lowest level tree node + * which contains a path to both leaves. + * + * 4) Rotate the subtree. + * + * 5) Find the next subtree by considering the left path to be + * the new right path. + * + * The check at the top of this while loop also accepts + * insert_cpos == cpos because cpos is only a _theoretical_ + * value to get us the left path - insert_cpos might very well + * be filling that hole. + * + * Stop at a cpos of '0' because we either started at the + * leftmost branch (i.e., a tree with one branch and a + * rotation inside of it), or we've gone as far as we can in + * rotating subtrees. + */ + while (cpos && insert_cpos <= cpos) { + trace_ocfs2_rotate_tree_right( + (unsigned long long) + ocfs2_metadata_cache_owner(et->et_ci), + insert_cpos, cpos); + + ret = ocfs2_find_path(et->et_ci, left_path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + mlog_bug_on_msg(path_leaf_bh(left_path) == + path_leaf_bh(right_path), + "Owner %llu: error during insert of %u " + "(left path cpos %u) results in two identical " + "paths ending at %llu\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + insert_cpos, cpos, + (unsigned long long) + path_leaf_bh(left_path)->b_blocknr); + + if (split == SPLIT_NONE && + ocfs2_rotate_requires_path_adjustment(left_path, + insert_cpos)) { + + /* + * We've rotated the tree as much as we + * should. The rest is up to + * ocfs2_insert_path() to complete, after the + * record insertion. We indicate this + * situation by returning the left path. + * + * The reason we don't adjust the records here + * before the record insert is that an error + * later might break the rule where a parent + * record e_cpos will reflect the actual + * e_cpos of the 1st nonempty record of the + * child list. + */ + *ret_left_path = left_path; + goto out_ret_path; + } + + start = ocfs2_find_subtree_root(et, left_path, right_path); + + trace_ocfs2_rotate_subtree(start, + (unsigned long long) + right_path->p_node[start].bh->b_blocknr, + right_path->p_tree_depth); + + ret = ocfs2_extend_rotate_transaction(handle, start, + orig_credits, right_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_rotate_subtree_right(handle, et, left_path, + right_path, start); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (split != SPLIT_NONE && + ocfs2_leftmost_rec_contains(path_leaf_el(right_path), + insert_cpos)) { + /* + * A rotate moves the rightmost left leaf + * record over to the leftmost right leaf + * slot. If we're doing an extent split + * instead of a real insert, then we have to + * check that the extent to be split wasn't + * just moved over. If it was, then we can + * exit here, passing left_path back - + * ocfs2_split_extent() is smart enough to + * search both leaves. + */ + *ret_left_path = left_path; + goto out_ret_path; + } + + /* + * There is no need to re-read the next right path + * as we know that it'll be our current left + * path. Optimize by copying values instead. + */ + ocfs2_mv_path(right_path, left_path); + + ret = ocfs2_find_cpos_for_left_leaf(sb, right_path, &cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + } + +out: + ocfs2_free_path(left_path); + +out_ret_path: + return ret; +} + +static int ocfs2_update_edge_lengths(handle_t *handle, + struct ocfs2_extent_tree *et, + int subtree_index, struct ocfs2_path *path) +{ + int i, idx, ret; + struct ocfs2_extent_rec *rec; + struct ocfs2_extent_list *el; + struct ocfs2_extent_block *eb; + u32 range; + + /* + * In normal tree rotation process, we will never touch the + * tree branch above subtree_index and ocfs2_extend_rotate_transaction + * doesn't reserve the credits for them either. + * + * But we do have a special case here which will update the rightmost + * records for all the bh in the path. + * So we have to allocate extra credits and access them. + */ + ret = ocfs2_extend_trans(handle, subtree_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, path); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* Path should always be rightmost. */ + eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data; + BUG_ON(eb->h_next_leaf_blk != 0ULL); + + el = &eb->h_list; + BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0); + idx = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[idx]; + range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); + + for (i = 0; i < path->p_tree_depth; i++) { + el = path->p_node[i].el; + idx = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[idx]; + + rec->e_int_clusters = cpu_to_le32(range); + le32_add_cpu(&rec->e_int_clusters, -le32_to_cpu(rec->e_cpos)); + + ocfs2_journal_dirty(handle, path->p_node[i].bh); + } +out: + return ret; +} + +static void ocfs2_unlink_path(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_cached_dealloc_ctxt *dealloc, + struct ocfs2_path *path, int unlink_start) +{ + int ret, i; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct buffer_head *bh; + + for(i = unlink_start; i < path_num_items(path); i++) { + bh = path->p_node[i].bh; + + eb = (struct ocfs2_extent_block *)bh->b_data; + /* + * Not all nodes might have had their final count + * decremented by the caller - handle this here. + */ + el = &eb->h_list; + if (le16_to_cpu(el->l_next_free_rec) > 1) { + mlog(ML_ERROR, + "Inode %llu, attempted to remove extent block " + "%llu with %u records\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + (unsigned long long)le64_to_cpu(eb->h_blkno), + le16_to_cpu(el->l_next_free_rec)); + + ocfs2_journal_dirty(handle, bh); + ocfs2_remove_from_cache(et->et_ci, bh); + continue; + } + + el->l_next_free_rec = 0; + memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec)); + + ocfs2_journal_dirty(handle, bh); + + ret = ocfs2_cache_extent_block_free(dealloc, eb); + if (ret) + mlog_errno(ret); + + ocfs2_remove_from_cache(et->et_ci, bh); + } +} + +static void ocfs2_unlink_subtree(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + int subtree_index, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int i; + struct buffer_head *root_bh = left_path->p_node[subtree_index].bh; + struct ocfs2_extent_list *root_el = left_path->p_node[subtree_index].el; + struct ocfs2_extent_list *el; + struct ocfs2_extent_block *eb; + + el = path_leaf_el(left_path); + + eb = (struct ocfs2_extent_block *)right_path->p_node[subtree_index + 1].bh->b_data; + + for(i = 1; i < le16_to_cpu(root_el->l_next_free_rec); i++) + if (root_el->l_recs[i].e_blkno == eb->h_blkno) + break; + + BUG_ON(i >= le16_to_cpu(root_el->l_next_free_rec)); + + memset(&root_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec)); + le16_add_cpu(&root_el->l_next_free_rec, -1); + + eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data; + eb->h_next_leaf_blk = 0; + + ocfs2_journal_dirty(handle, root_bh); + ocfs2_journal_dirty(handle, path_leaf_bh(left_path)); + + ocfs2_unlink_path(handle, et, dealloc, right_path, + subtree_index + 1); +} + +static int ocfs2_rotate_subtree_left(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + int subtree_index, + struct ocfs2_cached_dealloc_ctxt *dealloc, + int *deleted) +{ + int ret, i, del_right_subtree = 0, right_has_empty = 0; + struct buffer_head *root_bh, *et_root_bh = path_root_bh(right_path); + struct ocfs2_extent_list *right_leaf_el, *left_leaf_el; + struct ocfs2_extent_block *eb; + + *deleted = 0; + + right_leaf_el = path_leaf_el(right_path); + left_leaf_el = path_leaf_el(left_path); + root_bh = left_path->p_node[subtree_index].bh; + BUG_ON(root_bh != right_path->p_node[subtree_index].bh); + + if (!ocfs2_is_empty_extent(&left_leaf_el->l_recs[0])) + return 0; + + eb = (struct ocfs2_extent_block *)path_leaf_bh(right_path)->b_data; + if (ocfs2_is_empty_extent(&right_leaf_el->l_recs[0])) { + /* + * It's legal for us to proceed if the right leaf is + * the rightmost one and it has an empty extent. There + * are two cases to handle - whether the leaf will be + * empty after removal or not. If the leaf isn't empty + * then just remove the empty extent up front. The + * next block will handle empty leaves by flagging + * them for unlink. + * + * Non rightmost leaves will throw -EAGAIN and the + * caller can manually move the subtree and retry. + */ + + if (eb->h_next_leaf_blk != 0ULL) + return -EAGAIN; + + if (le16_to_cpu(right_leaf_el->l_next_free_rec) > 1) { + ret = ocfs2_journal_access_eb(handle, et->et_ci, + path_leaf_bh(right_path), + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out; + } + + ocfs2_remove_empty_extent(right_leaf_el); + } else + right_has_empty = 1; + } + + if (eb->h_next_leaf_blk == 0ULL && + le16_to_cpu(right_leaf_el->l_next_free_rec) == 1) { + /* + * We have to update i_last_eb_blk during the meta + * data delete. + */ + ret = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out; + } + + del_right_subtree = 1; + } + + /* + * Getting here with an empty extent in the right path implies + * that it's the rightmost path and will be deleted. + */ + BUG_ON(right_has_empty && !del_right_subtree); + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path, + subtree_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + for(i = subtree_index + 1; i < path_num_items(right_path); i++) { + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + right_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + left_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + if (!right_has_empty) { + /* + * Only do this if we're moving a real + * record. Otherwise, the action is delayed until + * after removal of the right path in which case we + * can do a simple shift to remove the empty extent. + */ + ocfs2_rotate_leaf(left_leaf_el, &right_leaf_el->l_recs[0]); + memset(&right_leaf_el->l_recs[0], 0, + sizeof(struct ocfs2_extent_rec)); + } + if (eb->h_next_leaf_blk == 0ULL) { + /* + * Move recs over to get rid of empty extent, decrease + * next_free. This is allowed to remove the last + * extent in our leaf (setting l_next_free_rec to + * zero) - the delete code below won't care. + */ + ocfs2_remove_empty_extent(right_leaf_el); + } + + ocfs2_journal_dirty(handle, path_leaf_bh(left_path)); + ocfs2_journal_dirty(handle, path_leaf_bh(right_path)); + + if (del_right_subtree) { + ocfs2_unlink_subtree(handle, et, left_path, right_path, + subtree_index, dealloc); + ret = ocfs2_update_edge_lengths(handle, et, subtree_index, + left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data; + ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno)); + + /* + * Removal of the extent in the left leaf was skipped + * above so we could delete the right path + * 1st. + */ + if (right_has_empty) + ocfs2_remove_empty_extent(left_leaf_el); + + ocfs2_journal_dirty(handle, et_root_bh); + + *deleted = 1; + } else + ocfs2_complete_edge_insert(handle, left_path, right_path, + subtree_index); + +out: + return ret; +} + +/* + * Given a full path, determine what cpos value would return us a path + * containing the leaf immediately to the right of the current one. + * + * Will return zero if the path passed in is already the rightmost path. + * + * This looks similar, but is subtly different to + * ocfs2_find_cpos_for_left_leaf(). + */ +int ocfs2_find_cpos_for_right_leaf(struct super_block *sb, + struct ocfs2_path *path, u32 *cpos) +{ + int i, j, ret = 0; + u64 blkno; + struct ocfs2_extent_list *el; + + *cpos = 0; + + if (path->p_tree_depth == 0) + return 0; + + blkno = path_leaf_bh(path)->b_blocknr; + + /* Start at the tree node just above the leaf and work our way up. */ + i = path->p_tree_depth - 1; + while (i >= 0) { + int next_free; + + el = path->p_node[i].el; + + /* + * Find the extent record just after the one in our + * path. + */ + next_free = le16_to_cpu(el->l_next_free_rec); + for(j = 0; j < le16_to_cpu(el->l_next_free_rec); j++) { + if (le64_to_cpu(el->l_recs[j].e_blkno) == blkno) { + if (j == (next_free - 1)) { + if (i == 0) { + /* + * We've determined that the + * path specified is already + * the rightmost one - return a + * cpos of zero. + */ + goto out; + } + /* + * The rightmost record points to our + * leaf - we need to travel up the + * tree one level. + */ + goto next_node; + } + + *cpos = le32_to_cpu(el->l_recs[j + 1].e_cpos); + goto out; + } + } + + /* + * If we got here, we never found a valid node where + * the tree indicated one should be. + */ + ocfs2_error(sb, + "Invalid extent tree at extent block %llu\n", + (unsigned long long)blkno); + ret = -EROFS; + goto out; + +next_node: + blkno = path->p_node[i].bh->b_blocknr; + i--; + } + +out: + return ret; +} + +static int ocfs2_rotate_rightmost_leaf_left(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path) +{ + int ret; + struct buffer_head *bh = path_leaf_bh(path); + struct ocfs2_extent_list *el = path_leaf_el(path); + + if (!ocfs2_is_empty_extent(&el->l_recs[0])) + return 0; + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, path, + path_num_items(path) - 1); + if (ret) { + mlog_errno(ret); + goto out; + } + + ocfs2_remove_empty_extent(el); + ocfs2_journal_dirty(handle, bh); + +out: + return ret; +} + +static int __ocfs2_rotate_tree_left(handle_t *handle, + struct ocfs2_extent_tree *et, + int orig_credits, + struct ocfs2_path *path, + struct ocfs2_cached_dealloc_ctxt *dealloc, + struct ocfs2_path **empty_extent_path) +{ + int ret, subtree_root, deleted; + u32 right_cpos; + struct ocfs2_path *left_path = NULL; + struct ocfs2_path *right_path = NULL; + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + + BUG_ON(!ocfs2_is_empty_extent(&(path_leaf_el(path)->l_recs[0]))); + + *empty_extent_path = NULL; + + ret = ocfs2_find_cpos_for_right_leaf(sb, path, &right_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + left_path = ocfs2_new_path_from_path(path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ocfs2_cp_path(left_path, path); + + right_path = ocfs2_new_path_from_path(path); + if (!right_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + while (right_cpos) { + ret = ocfs2_find_path(et->et_ci, right_path, right_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + subtree_root = ocfs2_find_subtree_root(et, left_path, + right_path); + + trace_ocfs2_rotate_subtree(subtree_root, + (unsigned long long) + right_path->p_node[subtree_root].bh->b_blocknr, + right_path->p_tree_depth); + + ret = ocfs2_extend_rotate_transaction(handle, subtree_root, + orig_credits, left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * Caller might still want to make changes to the + * tree root, so re-add it to the journal here. + */ + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + left_path, 0); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_rotate_subtree_left(handle, et, left_path, + right_path, subtree_root, + dealloc, &deleted); + if (ret == -EAGAIN) { + /* + * The rotation has to temporarily stop due to + * the right subtree having an empty + * extent. Pass it back to the caller for a + * fixup. + */ + *empty_extent_path = right_path; + right_path = NULL; + goto out; + } + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * The subtree rotate might have removed records on + * the rightmost edge. If so, then rotation is + * complete. + */ + if (deleted) + break; + + ocfs2_mv_path(left_path, right_path); + + ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, + &right_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + } + +out: + ocfs2_free_path(right_path); + ocfs2_free_path(left_path); + + return ret; +} + +static int ocfs2_remove_rightmost_path(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int ret, subtree_index; + u32 cpos; + struct ocfs2_path *left_path = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + + + ret = ocfs2_et_sanity_check(et); + if (ret) + goto out; + /* + * There's two ways we handle this depending on + * whether path is the only existing one. + */ + ret = ocfs2_extend_rotate_transaction(handle, 0, + handle->h_buffer_credits, + path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci), + path, &cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (cpos) { + /* + * We have a path to the left of this one - it needs + * an update too. + */ + left_path = ocfs2_new_path_from_path(path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, left_path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + subtree_index = ocfs2_find_subtree_root(et, left_path, path); + + ocfs2_unlink_subtree(handle, et, left_path, path, + subtree_index, dealloc); + ret = ocfs2_update_edge_lengths(handle, et, subtree_index, + left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data; + ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno)); + } else { + /* + * 'path' is also the leftmost path which + * means it must be the only one. This gets + * handled differently because we want to + * revert the root back to having extents + * in-line. + */ + ocfs2_unlink_path(handle, et, dealloc, path, 1); + + el = et->et_root_el; + el->l_tree_depth = 0; + el->l_next_free_rec = 0; + memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec)); + + ocfs2_et_set_last_eb_blk(et, 0); + } + + ocfs2_journal_dirty(handle, path_root_bh(path)); + +out: + ocfs2_free_path(left_path); + return ret; +} + +/* + * Left rotation of btree records. + * + * In many ways, this is (unsurprisingly) the opposite of right + * rotation. We start at some non-rightmost path containing an empty + * extent in the leaf block. The code works its way to the rightmost + * path by rotating records to the left in every subtree. + * + * This is used by any code which reduces the number of extent records + * in a leaf. After removal, an empty record should be placed in the + * leftmost list position. + * + * This won't handle a length update of the rightmost path records if + * the rightmost tree leaf record is removed so the caller is + * responsible for detecting and correcting that. + */ +static int ocfs2_rotate_tree_left(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int ret, orig_credits = handle->h_buffer_credits; + struct ocfs2_path *tmp_path = NULL, *restart_path = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + + el = path_leaf_el(path); + if (!ocfs2_is_empty_extent(&el->l_recs[0])) + return 0; + + if (path->p_tree_depth == 0) { +rightmost_no_delete: + /* + * Inline extents. This is trivially handled, so do + * it up front. + */ + ret = ocfs2_rotate_rightmost_leaf_left(handle, et, path); + if (ret) + mlog_errno(ret); + goto out; + } + + /* + * Handle rightmost branch now. There's several cases: + * 1) simple rotation leaving records in there. That's trivial. + * 2) rotation requiring a branch delete - there's no more + * records left. Two cases of this: + * a) There are branches to the left. + * b) This is also the leftmost (the only) branch. + * + * 1) is handled via ocfs2_rotate_rightmost_leaf_left() + * 2a) we need the left branch so that we can update it with the unlink + * 2b) we need to bring the root back to inline extents. + */ + + eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data; + el = &eb->h_list; + if (eb->h_next_leaf_blk == 0) { + /* + * This gets a bit tricky if we're going to delete the + * rightmost path. Get the other cases out of the way + * 1st. + */ + if (le16_to_cpu(el->l_next_free_rec) > 1) + goto rightmost_no_delete; + + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ret = -EIO; + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has empty extent block at %llu", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + (unsigned long long)le64_to_cpu(eb->h_blkno)); + goto out; + } + + /* + * XXX: The caller can not trust "path" any more after + * this as it will have been deleted. What do we do? + * + * In theory the rotate-for-merge code will never get + * here because it'll always ask for a rotate in a + * nonempty list. + */ + + ret = ocfs2_remove_rightmost_path(handle, et, path, + dealloc); + if (ret) + mlog_errno(ret); + goto out; + } + + /* + * Now we can loop, remembering the path we get from -EAGAIN + * and restarting from there. + */ +try_rotate: + ret = __ocfs2_rotate_tree_left(handle, et, orig_credits, path, + dealloc, &restart_path); + if (ret && ret != -EAGAIN) { + mlog_errno(ret); + goto out; + } + + while (ret == -EAGAIN) { + tmp_path = restart_path; + restart_path = NULL; + + ret = __ocfs2_rotate_tree_left(handle, et, orig_credits, + tmp_path, dealloc, + &restart_path); + if (ret && ret != -EAGAIN) { + mlog_errno(ret); + goto out; + } + + ocfs2_free_path(tmp_path); + tmp_path = NULL; + + if (ret == 0) + goto try_rotate; + } + +out: + ocfs2_free_path(tmp_path); + ocfs2_free_path(restart_path); + return ret; +} + +static void ocfs2_cleanup_merge(struct ocfs2_extent_list *el, + int index) +{ + struct ocfs2_extent_rec *rec = &el->l_recs[index]; + unsigned int size; + + if (rec->e_leaf_clusters == 0) { + /* + * We consumed all of the merged-from record. An empty + * extent cannot exist anywhere but the 1st array + * position, so move things over if the merged-from + * record doesn't occupy that position. + * + * This creates a new empty extent so the caller + * should be smart enough to have removed any existing + * ones. + */ + if (index > 0) { + BUG_ON(ocfs2_is_empty_extent(&el->l_recs[0])); + size = index * sizeof(struct ocfs2_extent_rec); + memmove(&el->l_recs[1], &el->l_recs[0], size); + } + + /* + * Always memset - the caller doesn't check whether it + * created an empty extent, so there could be junk in + * the other fields. + */ + memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec)); + } +} + +static int ocfs2_get_right_path(struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path **ret_right_path) +{ + int ret; + u32 right_cpos; + struct ocfs2_path *right_path = NULL; + struct ocfs2_extent_list *left_el; + + *ret_right_path = NULL; + + /* This function shouldn't be called for non-trees. */ + BUG_ON(left_path->p_tree_depth == 0); + + left_el = path_leaf_el(left_path); + BUG_ON(left_el->l_next_free_rec != left_el->l_count); + + ret = ocfs2_find_cpos_for_right_leaf(ocfs2_metadata_cache_get_super(et->et_ci), + left_path, &right_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* This function shouldn't be called for the rightmost leaf. */ + BUG_ON(right_cpos == 0); + + right_path = ocfs2_new_path_from_path(left_path); + if (!right_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, right_path, right_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + *ret_right_path = right_path; +out: + if (ret) + ocfs2_free_path(right_path); + return ret; +} + +/* + * Remove split_rec clusters from the record at index and merge them + * onto the beginning of the record "next" to it. + * For index < l_count - 1, the next means the extent rec at index + 1. + * For index == l_count - 1, the "next" means the 1st extent rec of the + * next extent block. + */ +static int ocfs2_merge_rec_right(struct ocfs2_path *left_path, + handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *split_rec, + int index) +{ + int ret, next_free, i; + unsigned int split_clusters = le16_to_cpu(split_rec->e_leaf_clusters); + struct ocfs2_extent_rec *left_rec; + struct ocfs2_extent_rec *right_rec; + struct ocfs2_extent_list *right_el; + struct ocfs2_path *right_path = NULL; + int subtree_index = 0; + struct ocfs2_extent_list *el = path_leaf_el(left_path); + struct buffer_head *bh = path_leaf_bh(left_path); + struct buffer_head *root_bh = NULL; + + BUG_ON(index >= le16_to_cpu(el->l_next_free_rec)); + left_rec = &el->l_recs[index]; + + if (index == le16_to_cpu(el->l_next_free_rec) - 1 && + le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count)) { + /* we meet with a cross extent block merge. */ + ret = ocfs2_get_right_path(et, left_path, &right_path); + if (ret) { + mlog_errno(ret); + return ret; + } + + right_el = path_leaf_el(right_path); + next_free = le16_to_cpu(right_el->l_next_free_rec); + BUG_ON(next_free <= 0); + right_rec = &right_el->l_recs[0]; + if (ocfs2_is_empty_extent(right_rec)) { + BUG_ON(next_free <= 1); + right_rec = &right_el->l_recs[1]; + } + + BUG_ON(le32_to_cpu(left_rec->e_cpos) + + le16_to_cpu(left_rec->e_leaf_clusters) != + le32_to_cpu(right_rec->e_cpos)); + + subtree_index = ocfs2_find_subtree_root(et, left_path, + right_path); + + ret = ocfs2_extend_rotate_transaction(handle, subtree_index, + handle->h_buffer_credits, + right_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + root_bh = left_path->p_node[subtree_index].bh; + BUG_ON(root_bh != right_path->p_node[subtree_index].bh); + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path, + subtree_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + for (i = subtree_index + 1; + i < path_num_items(right_path); i++) { + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + right_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + left_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + } else { + BUG_ON(index == le16_to_cpu(el->l_next_free_rec) - 1); + right_rec = &el->l_recs[index + 1]; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, left_path, + path_num_items(left_path) - 1); + if (ret) { + mlog_errno(ret); + goto out; + } + + le16_add_cpu(&left_rec->e_leaf_clusters, -split_clusters); + + le32_add_cpu(&right_rec->e_cpos, -split_clusters); + le64_add_cpu(&right_rec->e_blkno, + -ocfs2_clusters_to_blocks(ocfs2_metadata_cache_get_super(et->et_ci), + split_clusters)); + le16_add_cpu(&right_rec->e_leaf_clusters, split_clusters); + + ocfs2_cleanup_merge(el, index); + + ocfs2_journal_dirty(handle, bh); + if (right_path) { + ocfs2_journal_dirty(handle, path_leaf_bh(right_path)); + ocfs2_complete_edge_insert(handle, left_path, right_path, + subtree_index); + } +out: + ocfs2_free_path(right_path); + return ret; +} + +static int ocfs2_get_left_path(struct ocfs2_extent_tree *et, + struct ocfs2_path *right_path, + struct ocfs2_path **ret_left_path) +{ + int ret; + u32 left_cpos; + struct ocfs2_path *left_path = NULL; + + *ret_left_path = NULL; + + /* This function shouldn't be called for non-trees. */ + BUG_ON(right_path->p_tree_depth == 0); + + ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci), + right_path, &left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* This function shouldn't be called for the leftmost leaf. */ + BUG_ON(left_cpos == 0); + + left_path = ocfs2_new_path_from_path(right_path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, left_path, left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + *ret_left_path = left_path; +out: + if (ret) + ocfs2_free_path(left_path); + return ret; +} + +/* + * Remove split_rec clusters from the record at index and merge them + * onto the tail of the record "before" it. + * For index > 0, the "before" means the extent rec at index - 1. + * + * For index == 0, the "before" means the last record of the previous + * extent block. And there is also a situation that we may need to + * remove the rightmost leaf extent block in the right_path and change + * the right path to indicate the new rightmost path. + */ +static int ocfs2_merge_rec_left(struct ocfs2_path *right_path, + handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *split_rec, + struct ocfs2_cached_dealloc_ctxt *dealloc, + int index) +{ + int ret, i, subtree_index = 0, has_empty_extent = 0; + unsigned int split_clusters = le16_to_cpu(split_rec->e_leaf_clusters); + struct ocfs2_extent_rec *left_rec; + struct ocfs2_extent_rec *right_rec; + struct ocfs2_extent_list *el = path_leaf_el(right_path); + struct buffer_head *bh = path_leaf_bh(right_path); + struct buffer_head *root_bh = NULL; + struct ocfs2_path *left_path = NULL; + struct ocfs2_extent_list *left_el; + + BUG_ON(index < 0); + + right_rec = &el->l_recs[index]; + if (index == 0) { + /* we meet with a cross extent block merge. */ + ret = ocfs2_get_left_path(et, right_path, &left_path); + if (ret) { + mlog_errno(ret); + return ret; + } + + left_el = path_leaf_el(left_path); + BUG_ON(le16_to_cpu(left_el->l_next_free_rec) != + le16_to_cpu(left_el->l_count)); + + left_rec = &left_el->l_recs[ + le16_to_cpu(left_el->l_next_free_rec) - 1]; + BUG_ON(le32_to_cpu(left_rec->e_cpos) + + le16_to_cpu(left_rec->e_leaf_clusters) != + le32_to_cpu(split_rec->e_cpos)); + + subtree_index = ocfs2_find_subtree_root(et, left_path, + right_path); + + ret = ocfs2_extend_rotate_transaction(handle, subtree_index, + handle->h_buffer_credits, + left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + root_bh = left_path->p_node[subtree_index].bh; + BUG_ON(root_bh != right_path->p_node[subtree_index].bh); + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path, + subtree_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + for (i = subtree_index + 1; + i < path_num_items(right_path); i++) { + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + right_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, + left_path, i); + if (ret) { + mlog_errno(ret); + goto out; + } + } + } else { + left_rec = &el->l_recs[index - 1]; + if (ocfs2_is_empty_extent(&el->l_recs[0])) + has_empty_extent = 1; + } + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, right_path, + path_num_items(right_path) - 1); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (has_empty_extent && index == 1) { + /* + * The easy case - we can just plop the record right in. + */ + *left_rec = *split_rec; + + has_empty_extent = 0; + } else + le16_add_cpu(&left_rec->e_leaf_clusters, split_clusters); + + le32_add_cpu(&right_rec->e_cpos, split_clusters); + le64_add_cpu(&right_rec->e_blkno, + ocfs2_clusters_to_blocks(ocfs2_metadata_cache_get_super(et->et_ci), + split_clusters)); + le16_add_cpu(&right_rec->e_leaf_clusters, -split_clusters); + + ocfs2_cleanup_merge(el, index); + + ocfs2_journal_dirty(handle, bh); + if (left_path) { + ocfs2_journal_dirty(handle, path_leaf_bh(left_path)); + + /* + * In the situation that the right_rec is empty and the extent + * block is empty also, ocfs2_complete_edge_insert can't handle + * it and we need to delete the right extent block. + */ + if (le16_to_cpu(right_rec->e_leaf_clusters) == 0 && + le16_to_cpu(el->l_next_free_rec) == 1) { + + ret = ocfs2_remove_rightmost_path(handle, et, + right_path, + dealloc); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* Now the rightmost extent block has been deleted. + * So we use the new rightmost path. + */ + ocfs2_mv_path(right_path, left_path); + left_path = NULL; + } else + ocfs2_complete_edge_insert(handle, left_path, + right_path, subtree_index); + } +out: + ocfs2_free_path(left_path); + return ret; +} + +static int ocfs2_try_to_merge_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + int split_index, + struct ocfs2_extent_rec *split_rec, + struct ocfs2_cached_dealloc_ctxt *dealloc, + struct ocfs2_merge_ctxt *ctxt) +{ + int ret = 0; + struct ocfs2_extent_list *el = path_leaf_el(path); + struct ocfs2_extent_rec *rec = &el->l_recs[split_index]; + + BUG_ON(ctxt->c_contig_type == CONTIG_NONE); + + if (ctxt->c_split_covers_rec && ctxt->c_has_empty_extent) { + /* + * The merge code will need to create an empty + * extent to take the place of the newly + * emptied slot. Remove any pre-existing empty + * extents - having more than one in a leaf is + * illegal. + */ + ret = ocfs2_rotate_tree_left(handle, et, path, dealloc); + if (ret) { + mlog_errno(ret); + goto out; + } + split_index--; + rec = &el->l_recs[split_index]; + } + + if (ctxt->c_contig_type == CONTIG_LEFTRIGHT) { + /* + * Left-right contig implies this. + */ + BUG_ON(!ctxt->c_split_covers_rec); + + /* + * Since the leftright insert always covers the entire + * extent, this call will delete the insert record + * entirely, resulting in an empty extent record added to + * the extent block. + * + * Since the adding of an empty extent shifts + * everything back to the right, there's no need to + * update split_index here. + * + * When the split_index is zero, we need to merge it to the + * prevoius extent block. It is more efficient and easier + * if we do merge_right first and merge_left later. + */ + ret = ocfs2_merge_rec_right(path, handle, et, split_rec, + split_index); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * We can only get this from logic error above. + */ + BUG_ON(!ocfs2_is_empty_extent(&el->l_recs[0])); + + /* The merge left us with an empty extent, remove it. */ + ret = ocfs2_rotate_tree_left(handle, et, path, dealloc); + if (ret) { + mlog_errno(ret); + goto out; + } + + rec = &el->l_recs[split_index]; + + /* + * Note that we don't pass split_rec here on purpose - + * we've merged it into the rec already. + */ + ret = ocfs2_merge_rec_left(path, handle, et, rec, + dealloc, split_index); + + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_rotate_tree_left(handle, et, path, dealloc); + /* + * Error from this last rotate is not critical, so + * print but don't bubble it up. + */ + if (ret) + mlog_errno(ret); + ret = 0; + } else { + /* + * Merge a record to the left or right. + * + * 'contig_type' is relative to the existing record, + * so for example, if we're "right contig", it's to + * the record on the left (hence the left merge). + */ + if (ctxt->c_contig_type == CONTIG_RIGHT) { + ret = ocfs2_merge_rec_left(path, handle, et, + split_rec, dealloc, + split_index); + if (ret) { + mlog_errno(ret); + goto out; + } + } else { + ret = ocfs2_merge_rec_right(path, handle, + et, split_rec, + split_index); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + if (ctxt->c_split_covers_rec) { + /* + * The merge may have left an empty extent in + * our leaf. Try to rotate it away. + */ + ret = ocfs2_rotate_tree_left(handle, et, path, + dealloc); + if (ret) + mlog_errno(ret); + ret = 0; + } + } + +out: + return ret; +} + +static void ocfs2_subtract_from_rec(struct super_block *sb, + enum ocfs2_split_type split, + struct ocfs2_extent_rec *rec, + struct ocfs2_extent_rec *split_rec) +{ + u64 len_blocks; + + len_blocks = ocfs2_clusters_to_blocks(sb, + le16_to_cpu(split_rec->e_leaf_clusters)); + + if (split == SPLIT_LEFT) { + /* + * Region is on the left edge of the existing + * record. + */ + le32_add_cpu(&rec->e_cpos, + le16_to_cpu(split_rec->e_leaf_clusters)); + le64_add_cpu(&rec->e_blkno, len_blocks); + le16_add_cpu(&rec->e_leaf_clusters, + -le16_to_cpu(split_rec->e_leaf_clusters)); + } else { + /* + * Region is on the right edge of the existing + * record. + */ + le16_add_cpu(&rec->e_leaf_clusters, + -le16_to_cpu(split_rec->e_leaf_clusters)); + } +} + +/* + * Do the final bits of extent record insertion at the target leaf + * list. If this leaf is part of an allocation tree, it is assumed + * that the tree above has been prepared. + */ +static void ocfs2_insert_at_leaf(struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *insert_rec, + struct ocfs2_extent_list *el, + struct ocfs2_insert_type *insert) +{ + int i = insert->ins_contig_index; + unsigned int range; + struct ocfs2_extent_rec *rec; + + BUG_ON(le16_to_cpu(el->l_tree_depth) != 0); + + if (insert->ins_split != SPLIT_NONE) { + i = ocfs2_search_extent_list(el, le32_to_cpu(insert_rec->e_cpos)); + BUG_ON(i == -1); + rec = &el->l_recs[i]; + ocfs2_subtract_from_rec(ocfs2_metadata_cache_get_super(et->et_ci), + insert->ins_split, rec, + insert_rec); + goto rotate; + } + + /* + * Contiguous insert - either left or right. + */ + if (insert->ins_contig != CONTIG_NONE) { + rec = &el->l_recs[i]; + if (insert->ins_contig == CONTIG_LEFT) { + rec->e_blkno = insert_rec->e_blkno; + rec->e_cpos = insert_rec->e_cpos; + } + le16_add_cpu(&rec->e_leaf_clusters, + le16_to_cpu(insert_rec->e_leaf_clusters)); + return; + } + + /* + * Handle insert into an empty leaf. + */ + if (le16_to_cpu(el->l_next_free_rec) == 0 || + ((le16_to_cpu(el->l_next_free_rec) == 1) && + ocfs2_is_empty_extent(&el->l_recs[0]))) { + el->l_recs[0] = *insert_rec; + el->l_next_free_rec = cpu_to_le16(1); + return; + } + + /* + * Appending insert. + */ + if (insert->ins_appending == APPEND_TAIL) { + i = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[i]; + range = le32_to_cpu(rec->e_cpos) + + le16_to_cpu(rec->e_leaf_clusters); + BUG_ON(le32_to_cpu(insert_rec->e_cpos) < range); + + mlog_bug_on_msg(le16_to_cpu(el->l_next_free_rec) >= + le16_to_cpu(el->l_count), + "owner %llu, depth %u, count %u, next free %u, " + "rec.cpos %u, rec.clusters %u, " + "insert.cpos %u, insert.clusters %u\n", + ocfs2_metadata_cache_owner(et->et_ci), + le16_to_cpu(el->l_tree_depth), + le16_to_cpu(el->l_count), + le16_to_cpu(el->l_next_free_rec), + le32_to_cpu(el->l_recs[i].e_cpos), + le16_to_cpu(el->l_recs[i].e_leaf_clusters), + le32_to_cpu(insert_rec->e_cpos), + le16_to_cpu(insert_rec->e_leaf_clusters)); + i++; + el->l_recs[i] = *insert_rec; + le16_add_cpu(&el->l_next_free_rec, 1); + return; + } + +rotate: + /* + * Ok, we have to rotate. + * + * At this point, it is safe to assume that inserting into an + * empty leaf and appending to a leaf have both been handled + * above. + * + * This leaf needs to have space, either by the empty 1st + * extent record, or by virtue of an l_next_rec < l_count. + */ + ocfs2_rotate_leaf(el, insert_rec); +} + +static void ocfs2_adjust_rightmost_records(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_extent_rec *insert_rec) +{ + int ret, i, next_free; + struct buffer_head *bh; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + + /* + * Update everything except the leaf block. + */ + for (i = 0; i < path->p_tree_depth; i++) { + bh = path->p_node[i].bh; + el = path->p_node[i].el; + + next_free = le16_to_cpu(el->l_next_free_rec); + if (next_free == 0) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has a bad extent list", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci)); + ret = -EIO; + return; + } + + rec = &el->l_recs[next_free - 1]; + + rec->e_int_clusters = insert_rec->e_cpos; + le32_add_cpu(&rec->e_int_clusters, + le16_to_cpu(insert_rec->e_leaf_clusters)); + le32_add_cpu(&rec->e_int_clusters, + -le32_to_cpu(rec->e_cpos)); + + ocfs2_journal_dirty(handle, bh); + } +} + +static int ocfs2_append_rec_to_path(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *insert_rec, + struct ocfs2_path *right_path, + struct ocfs2_path **ret_left_path) +{ + int ret, next_free; + struct ocfs2_extent_list *el; + struct ocfs2_path *left_path = NULL; + + *ret_left_path = NULL; + + /* + * This shouldn't happen for non-trees. The extent rec cluster + * count manipulation below only works for interior nodes. + */ + BUG_ON(right_path->p_tree_depth == 0); + + /* + * If our appending insert is at the leftmost edge of a leaf, + * then we might need to update the rightmost records of the + * neighboring path. + */ + el = path_leaf_el(right_path); + next_free = le16_to_cpu(el->l_next_free_rec); + if (next_free == 0 || + (next_free == 1 && ocfs2_is_empty_extent(&el->l_recs[0]))) { + u32 left_cpos; + + ret = ocfs2_find_cpos_for_left_leaf(ocfs2_metadata_cache_get_super(et->et_ci), + right_path, &left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + trace_ocfs2_append_rec_to_path( + (unsigned long long) + ocfs2_metadata_cache_owner(et->et_ci), + le32_to_cpu(insert_rec->e_cpos), + left_cpos); + + /* + * No need to worry if the append is already in the + * leftmost leaf. + */ + if (left_cpos) { + left_path = ocfs2_new_path_from_path(right_path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, left_path, + left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * ocfs2_insert_path() will pass the left_path to the + * journal for us. + */ + } + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, right_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ocfs2_adjust_rightmost_records(handle, et, right_path, insert_rec); + + *ret_left_path = left_path; + ret = 0; +out: + if (ret != 0) + ocfs2_free_path(left_path); + + return ret; +} + +static void ocfs2_split_record(struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + struct ocfs2_extent_rec *split_rec, + enum ocfs2_split_type split) +{ + int index; + u32 cpos = le32_to_cpu(split_rec->e_cpos); + struct ocfs2_extent_list *left_el = NULL, *right_el, *insert_el, *el; + struct ocfs2_extent_rec *rec, *tmprec; + + right_el = path_leaf_el(right_path); + if (left_path) + left_el = path_leaf_el(left_path); + + el = right_el; + insert_el = right_el; + index = ocfs2_search_extent_list(el, cpos); + if (index != -1) { + if (index == 0 && left_path) { + BUG_ON(ocfs2_is_empty_extent(&el->l_recs[0])); + + /* + * This typically means that the record + * started in the left path but moved to the + * right as a result of rotation. We either + * move the existing record to the left, or we + * do the later insert there. + * + * In this case, the left path should always + * exist as the rotate code will have passed + * it back for a post-insert update. + */ + + if (split == SPLIT_LEFT) { + /* + * It's a left split. Since we know + * that the rotate code gave us an + * empty extent in the left path, we + * can just do the insert there. + */ + insert_el = left_el; + } else { + /* + * Right split - we have to move the + * existing record over to the left + * leaf. The insert will be into the + * newly created empty extent in the + * right leaf. + */ + tmprec = &right_el->l_recs[index]; + ocfs2_rotate_leaf(left_el, tmprec); + el = left_el; + + memset(tmprec, 0, sizeof(*tmprec)); + index = ocfs2_search_extent_list(left_el, cpos); + BUG_ON(index == -1); + } + } + } else { + BUG_ON(!left_path); + BUG_ON(!ocfs2_is_empty_extent(&left_el->l_recs[0])); + /* + * Left path is easy - we can just allow the insert to + * happen. + */ + el = left_el; + insert_el = left_el; + index = ocfs2_search_extent_list(el, cpos); + BUG_ON(index == -1); + } + + rec = &el->l_recs[index]; + ocfs2_subtract_from_rec(ocfs2_metadata_cache_get_super(et->et_ci), + split, rec, split_rec); + ocfs2_rotate_leaf(insert_el, split_rec); +} + +/* + * This function only does inserts on an allocation b-tree. For tree + * depth = 0, ocfs2_insert_at_leaf() is called directly. + * + * right_path is the path we want to do the actual insert + * in. left_path should only be passed in if we need to update that + * portion of the tree after an edge insert. + */ +static int ocfs2_insert_path(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *left_path, + struct ocfs2_path *right_path, + struct ocfs2_extent_rec *insert_rec, + struct ocfs2_insert_type *insert) +{ + int ret, subtree_index; + struct buffer_head *leaf_bh = path_leaf_bh(right_path); + + if (left_path) { + /* + * There's a chance that left_path got passed back to + * us without being accounted for in the + * journal. Extend our transaction here to be sure we + * can change those blocks. + */ + ret = ocfs2_extend_trans(handle, left_path->p_tree_depth); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, left_path); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + /* + * Pass both paths to the journal. The majority of inserts + * will be touching all components anyway. + */ + ret = ocfs2_journal_access_path(et->et_ci, handle, right_path); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + if (insert->ins_split != SPLIT_NONE) { + /* + * We could call ocfs2_insert_at_leaf() for some types + * of splits, but it's easier to just let one separate + * function sort it all out. + */ + ocfs2_split_record(et, left_path, right_path, + insert_rec, insert->ins_split); + + /* + * Split might have modified either leaf and we don't + * have a guarantee that the later edge insert will + * dirty this for us. + */ + if (left_path) + ocfs2_journal_dirty(handle, + path_leaf_bh(left_path)); + } else + ocfs2_insert_at_leaf(et, insert_rec, path_leaf_el(right_path), + insert); + + ocfs2_journal_dirty(handle, leaf_bh); + + if (left_path) { + /* + * The rotate code has indicated that we need to fix + * up portions of the tree after the insert. + * + * XXX: Should we extend the transaction here? + */ + subtree_index = ocfs2_find_subtree_root(et, left_path, + right_path); + ocfs2_complete_edge_insert(handle, left_path, right_path, + subtree_index); + } + + ret = 0; +out: + return ret; +} + +static int ocfs2_do_insert_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *insert_rec, + struct ocfs2_insert_type *type) +{ + int ret, rotate = 0; + u32 cpos; + struct ocfs2_path *right_path = NULL; + struct ocfs2_path *left_path = NULL; + struct ocfs2_extent_list *el; + + el = et->et_root_el; + + ret = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (le16_to_cpu(el->l_tree_depth) == 0) { + ocfs2_insert_at_leaf(et, insert_rec, el, type); + goto out_update_clusters; + } + + right_path = ocfs2_new_path_from_et(et); + if (!right_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + /* + * Determine the path to start with. Rotations need the + * rightmost path, everything else can go directly to the + * target leaf. + */ + cpos = le32_to_cpu(insert_rec->e_cpos); + if (type->ins_appending == APPEND_NONE && + type->ins_contig == CONTIG_NONE) { + rotate = 1; + cpos = UINT_MAX; + } + + ret = ocfs2_find_path(et->et_ci, right_path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * Rotations and appends need special treatment - they modify + * parts of the tree's above them. + * + * Both might pass back a path immediate to the left of the + * one being inserted to. This will be cause + * ocfs2_insert_path() to modify the rightmost records of + * left_path to account for an edge insert. + * + * XXX: When modifying this code, keep in mind that an insert + * can wind up skipping both of these two special cases... + */ + if (rotate) { + ret = ocfs2_rotate_tree_right(handle, et, type->ins_split, + le32_to_cpu(insert_rec->e_cpos), + right_path, &left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * ocfs2_rotate_tree_right() might have extended the + * transaction without re-journaling our tree root. + */ + ret = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out; + } + } else if (type->ins_appending == APPEND_TAIL + && type->ins_contig != CONTIG_LEFT) { + ret = ocfs2_append_rec_to_path(handle, et, insert_rec, + right_path, &left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + ret = ocfs2_insert_path(handle, et, left_path, right_path, + insert_rec, type); + if (ret) { + mlog_errno(ret); + goto out; + } + +out_update_clusters: + if (type->ins_split == SPLIT_NONE) + ocfs2_et_update_clusters(et, + le16_to_cpu(insert_rec->e_leaf_clusters)); + + ocfs2_journal_dirty(handle, et->et_root_bh); + +out: + ocfs2_free_path(left_path); + ocfs2_free_path(right_path); + + return ret; +} + +static enum ocfs2_contig_type +ocfs2_figure_merge_contig_type(struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_extent_list *el, int index, + struct ocfs2_extent_rec *split_rec) +{ + int status; + enum ocfs2_contig_type ret = CONTIG_NONE; + u32 left_cpos, right_cpos; + struct ocfs2_extent_rec *rec = NULL; + struct ocfs2_extent_list *new_el; + struct ocfs2_path *left_path = NULL, *right_path = NULL; + struct buffer_head *bh; + struct ocfs2_extent_block *eb; + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + + if (index > 0) { + rec = &el->l_recs[index - 1]; + } else if (path->p_tree_depth > 0) { + status = ocfs2_find_cpos_for_left_leaf(sb, path, &left_cpos); + if (status) + goto exit; + + if (left_cpos != 0) { + left_path = ocfs2_new_path_from_path(path); + if (!left_path) + goto exit; + + status = ocfs2_find_path(et->et_ci, left_path, + left_cpos); + if (status) + goto free_left_path; + + new_el = path_leaf_el(left_path); + + if (le16_to_cpu(new_el->l_next_free_rec) != + le16_to_cpu(new_el->l_count)) { + bh = path_leaf_bh(left_path); + eb = (struct ocfs2_extent_block *)bh->b_data; + ocfs2_error(sb, + "Extent block #%llu has an " + "invalid l_next_free_rec of " + "%d. It should have " + "matched the l_count of %d", + (unsigned long long)le64_to_cpu(eb->h_blkno), + le16_to_cpu(new_el->l_next_free_rec), + le16_to_cpu(new_el->l_count)); + status = -EINVAL; + goto free_left_path; + } + rec = &new_el->l_recs[ + le16_to_cpu(new_el->l_next_free_rec) - 1]; + } + } + + /* + * We're careful to check for an empty extent record here - + * the merge code will know what to do if it sees one. + */ + if (rec) { + if (index == 1 && ocfs2_is_empty_extent(rec)) { + if (split_rec->e_cpos == el->l_recs[index].e_cpos) + ret = CONTIG_RIGHT; + } else { + ret = ocfs2_et_extent_contig(et, rec, split_rec); + } + } + + rec = NULL; + if (index < (le16_to_cpu(el->l_next_free_rec) - 1)) + rec = &el->l_recs[index + 1]; + else if (le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count) && + path->p_tree_depth > 0) { + status = ocfs2_find_cpos_for_right_leaf(sb, path, &right_cpos); + if (status) + goto free_left_path; + + if (right_cpos == 0) + goto free_left_path; + + right_path = ocfs2_new_path_from_path(path); + if (!right_path) + goto free_left_path; + + status = ocfs2_find_path(et->et_ci, right_path, right_cpos); + if (status) + goto free_right_path; + + new_el = path_leaf_el(right_path); + rec = &new_el->l_recs[0]; + if (ocfs2_is_empty_extent(rec)) { + if (le16_to_cpu(new_el->l_next_free_rec) <= 1) { + bh = path_leaf_bh(right_path); + eb = (struct ocfs2_extent_block *)bh->b_data; + ocfs2_error(sb, + "Extent block #%llu has an " + "invalid l_next_free_rec of %d", + (unsigned long long)le64_to_cpu(eb->h_blkno), + le16_to_cpu(new_el->l_next_free_rec)); + status = -EINVAL; + goto free_right_path; + } + rec = &new_el->l_recs[1]; + } + } + + if (rec) { + enum ocfs2_contig_type contig_type; + + contig_type = ocfs2_et_extent_contig(et, rec, split_rec); + + if (contig_type == CONTIG_LEFT && ret == CONTIG_RIGHT) + ret = CONTIG_LEFTRIGHT; + else if (ret == CONTIG_NONE) + ret = contig_type; + } + +free_right_path: + ocfs2_free_path(right_path); +free_left_path: + ocfs2_free_path(left_path); +exit: + return ret; +} + +static void ocfs2_figure_contig_type(struct ocfs2_extent_tree *et, + struct ocfs2_insert_type *insert, + struct ocfs2_extent_list *el, + struct ocfs2_extent_rec *insert_rec) +{ + int i; + enum ocfs2_contig_type contig_type = CONTIG_NONE; + + BUG_ON(le16_to_cpu(el->l_tree_depth) != 0); + + for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { + contig_type = ocfs2_et_extent_contig(et, &el->l_recs[i], + insert_rec); + if (contig_type != CONTIG_NONE) { + insert->ins_contig_index = i; + break; + } + } + insert->ins_contig = contig_type; + + if (insert->ins_contig != CONTIG_NONE) { + struct ocfs2_extent_rec *rec = + &el->l_recs[insert->ins_contig_index]; + unsigned int len = le16_to_cpu(rec->e_leaf_clusters) + + le16_to_cpu(insert_rec->e_leaf_clusters); + + /* + * Caller might want us to limit the size of extents, don't + * calculate contiguousness if we might exceed that limit. + */ + if (et->et_max_leaf_clusters && + (len > et->et_max_leaf_clusters)) + insert->ins_contig = CONTIG_NONE; + } +} + +/* + * This should only be called against the righmost leaf extent list. + * + * ocfs2_figure_appending_type() will figure out whether we'll have to + * insert at the tail of the rightmost leaf. + * + * This should also work against the root extent list for tree's with 0 + * depth. If we consider the root extent list to be the rightmost leaf node + * then the logic here makes sense. + */ +static void ocfs2_figure_appending_type(struct ocfs2_insert_type *insert, + struct ocfs2_extent_list *el, + struct ocfs2_extent_rec *insert_rec) +{ + int i; + u32 cpos = le32_to_cpu(insert_rec->e_cpos); + struct ocfs2_extent_rec *rec; + + insert->ins_appending = APPEND_NONE; + + BUG_ON(le16_to_cpu(el->l_tree_depth) != 0); + + if (!el->l_next_free_rec) + goto set_tail_append; + + if (ocfs2_is_empty_extent(&el->l_recs[0])) { + /* Were all records empty? */ + if (le16_to_cpu(el->l_next_free_rec) == 1) + goto set_tail_append; + } + + i = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[i]; + + if (cpos >= + (le32_to_cpu(rec->e_cpos) + le16_to_cpu(rec->e_leaf_clusters))) + goto set_tail_append; + + return; + +set_tail_append: + insert->ins_appending = APPEND_TAIL; +} + +/* + * Helper function called at the beginning of an insert. + * + * This computes a few things that are commonly used in the process of + * inserting into the btree: + * - Whether the new extent is contiguous with an existing one. + * - The current tree depth. + * - Whether the insert is an appending one. + * - The total # of free records in the tree. + * + * All of the information is stored on the ocfs2_insert_type + * structure. + */ +static int ocfs2_figure_insert_type(struct ocfs2_extent_tree *et, + struct buffer_head **last_eb_bh, + struct ocfs2_extent_rec *insert_rec, + int *free_records, + struct ocfs2_insert_type *insert) +{ + int ret; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *el; + struct ocfs2_path *path = NULL; + struct buffer_head *bh = NULL; + + insert->ins_split = SPLIT_NONE; + + el = et->et_root_el; + insert->ins_tree_depth = le16_to_cpu(el->l_tree_depth); + + if (el->l_tree_depth) { + /* + * If we have tree depth, we read in the + * rightmost extent block ahead of time as + * ocfs2_figure_insert_type() and ocfs2_add_branch() + * may want it later. + */ + ret = ocfs2_read_extent_block(et->et_ci, + ocfs2_et_get_last_eb_blk(et), + &bh); + if (ret) { + mlog_errno(ret); + goto out; + } + eb = (struct ocfs2_extent_block *) bh->b_data; + el = &eb->h_list; + } + + /* + * Unless we have a contiguous insert, we'll need to know if + * there is room left in our allocation tree for another + * extent record. + * + * XXX: This test is simplistic, we can search for empty + * extent records too. + */ + *free_records = le16_to_cpu(el->l_count) - + le16_to_cpu(el->l_next_free_rec); + + if (!insert->ins_tree_depth) { + ocfs2_figure_contig_type(et, insert, el, insert_rec); + ocfs2_figure_appending_type(insert, el, insert_rec); + return 0; + } + + path = ocfs2_new_path_from_et(et); + if (!path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + /* + * In the case that we're inserting past what the tree + * currently accounts for, ocfs2_find_path() will return for + * us the rightmost tree path. This is accounted for below in + * the appending code. + */ + ret = ocfs2_find_path(et->et_ci, path, le32_to_cpu(insert_rec->e_cpos)); + if (ret) { + mlog_errno(ret); + goto out; + } + + el = path_leaf_el(path); + + /* + * Now that we have the path, there's two things we want to determine: + * 1) Contiguousness (also set contig_index if this is so) + * + * 2) Are we doing an append? We can trivially break this up + * into two types of appends: simple record append, or a + * rotate inside the tail leaf. + */ + ocfs2_figure_contig_type(et, insert, el, insert_rec); + + /* + * The insert code isn't quite ready to deal with all cases of + * left contiguousness. Specifically, if it's an insert into + * the 1st record in a leaf, it will require the adjustment of + * cluster count on the last record of the path directly to it's + * left. For now, just catch that case and fool the layers + * above us. This works just fine for tree_depth == 0, which + * is why we allow that above. + */ + if (insert->ins_contig == CONTIG_LEFT && + insert->ins_contig_index == 0) + insert->ins_contig = CONTIG_NONE; + + /* + * Ok, so we can simply compare against last_eb to figure out + * whether the path doesn't exist. This will only happen in + * the case that we're doing a tail append, so maybe we can + * take advantage of that information somehow. + */ + if (ocfs2_et_get_last_eb_blk(et) == + path_leaf_bh(path)->b_blocknr) { + /* + * Ok, ocfs2_find_path() returned us the rightmost + * tree path. This might be an appending insert. There are + * two cases: + * 1) We're doing a true append at the tail: + * -This might even be off the end of the leaf + * 2) We're "appending" by rotating in the tail + */ + ocfs2_figure_appending_type(insert, el, insert_rec); + } + +out: + ocfs2_free_path(path); + + if (ret == 0) + *last_eb_bh = bh; + else + brelse(bh); + return ret; +} + +/* + * Insert an extent into a btree. + * + * The caller needs to update the owning btree's cluster count. + */ +int ocfs2_insert_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + u32 cpos, + u64 start_blk, + u32 new_clusters, + u8 flags, + struct ocfs2_alloc_context *meta_ac) +{ + int status; + int uninitialized_var(free_records); + struct buffer_head *last_eb_bh = NULL; + struct ocfs2_insert_type insert = {0, }; + struct ocfs2_extent_rec rec; + + trace_ocfs2_insert_extent_start( + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos, new_clusters); + + memset(&rec, 0, sizeof(rec)); + rec.e_cpos = cpu_to_le32(cpos); + rec.e_blkno = cpu_to_le64(start_blk); + rec.e_leaf_clusters = cpu_to_le16(new_clusters); + rec.e_flags = flags; + status = ocfs2_et_insert_check(et, &rec); + if (status) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_figure_insert_type(et, &last_eb_bh, &rec, + &free_records, &insert); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + trace_ocfs2_insert_extent(insert.ins_appending, insert.ins_contig, + insert.ins_contig_index, free_records, + insert.ins_tree_depth); + + if (insert.ins_contig == CONTIG_NONE && free_records == 0) { + status = ocfs2_grow_tree(handle, et, + &insert.ins_tree_depth, &last_eb_bh, + meta_ac); + if (status) { + mlog_errno(status); + goto bail; + } + } + + /* Finally, we can add clusters. This might rotate the tree for us. */ + status = ocfs2_do_insert_extent(handle, et, &rec, &insert); + if (status < 0) + mlog_errno(status); + else + ocfs2_et_extent_map_insert(et, &rec); + +bail: + brelse(last_eb_bh); + + return status; +} + +/* + * Allcate and add clusters into the extent b-tree. + * The new clusters(clusters_to_add) will be inserted at logical_offset. + * The extent b-tree's root is specified by et, and + * it is not limited to the file storage. Any extent tree can use this + * function if it implements the proper ocfs2_extent_tree. + */ +int ocfs2_add_clusters_in_btree(handle_t *handle, + struct ocfs2_extent_tree *et, + u32 *logical_offset, + u32 clusters_to_add, + int mark_unwritten, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + enum ocfs2_alloc_restarted *reason_ret) +{ + int status = 0, err = 0; + int need_free = 0; + int free_extents; + enum ocfs2_alloc_restarted reason = RESTART_NONE; + u32 bit_off, num_bits; + u64 block; + u8 flags = 0; + struct ocfs2_super *osb = + OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci)); + + BUG_ON(!clusters_to_add); + + if (mark_unwritten) + flags = OCFS2_EXT_UNWRITTEN; + + free_extents = ocfs2_num_free_extents(osb, et); + if (free_extents < 0) { + status = free_extents; + mlog_errno(status); + goto leave; + } + + /* there are two cases which could cause us to EAGAIN in the + * we-need-more-metadata case: + * 1) we haven't reserved *any* + * 2) we are so fragmented, we've needed to add metadata too + * many times. */ + if (!free_extents && !meta_ac) { + err = -1; + status = -EAGAIN; + reason = RESTART_META; + goto leave; + } else if ((!free_extents) + && (ocfs2_alloc_context_bits_left(meta_ac) + < ocfs2_extend_meta_needed(et->et_root_el))) { + err = -2; + status = -EAGAIN; + reason = RESTART_META; + goto leave; + } + + status = __ocfs2_claim_clusters(handle, data_ac, 1, + clusters_to_add, &bit_off, &num_bits); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + BUG_ON(num_bits > clusters_to_add); + + /* reserve our write early -- insert_extent may update the tree root */ + status = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + need_free = 1; + goto bail; + } + + block = ocfs2_clusters_to_blocks(osb->sb, bit_off); + trace_ocfs2_add_clusters_in_btree( + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + bit_off, num_bits); + status = ocfs2_insert_extent(handle, et, *logical_offset, block, + num_bits, flags, meta_ac); + if (status < 0) { + mlog_errno(status); + need_free = 1; + goto bail; + } + + ocfs2_journal_dirty(handle, et->et_root_bh); + + clusters_to_add -= num_bits; + *logical_offset += num_bits; + + if (clusters_to_add) { + err = clusters_to_add; + status = -EAGAIN; + reason = RESTART_TRANS; + } + +bail: + if (need_free) { + if (data_ac->ac_which == OCFS2_AC_USE_LOCAL) + ocfs2_free_local_alloc_bits(osb, handle, data_ac, + bit_off, num_bits); + else + ocfs2_free_clusters(handle, + data_ac->ac_inode, + data_ac->ac_bh, + ocfs2_clusters_to_blocks(osb->sb, bit_off), + num_bits); + } + +leave: + if (reason_ret) + *reason_ret = reason; + trace_ocfs2_add_clusters_in_btree_ret(status, reason, err); + return status; +} + +static void ocfs2_make_right_split_rec(struct super_block *sb, + struct ocfs2_extent_rec *split_rec, + u32 cpos, + struct ocfs2_extent_rec *rec) +{ + u32 rec_cpos = le32_to_cpu(rec->e_cpos); + u32 rec_range = rec_cpos + le16_to_cpu(rec->e_leaf_clusters); + + memset(split_rec, 0, sizeof(struct ocfs2_extent_rec)); + + split_rec->e_cpos = cpu_to_le32(cpos); + split_rec->e_leaf_clusters = cpu_to_le16(rec_range - cpos); + + split_rec->e_blkno = rec->e_blkno; + le64_add_cpu(&split_rec->e_blkno, + ocfs2_clusters_to_blocks(sb, cpos - rec_cpos)); + + split_rec->e_flags = rec->e_flags; +} + +static int ocfs2_split_and_insert(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct buffer_head **last_eb_bh, + int split_index, + struct ocfs2_extent_rec *orig_split_rec, + struct ocfs2_alloc_context *meta_ac) +{ + int ret = 0, depth; + unsigned int insert_range, rec_range, do_leftright = 0; + struct ocfs2_extent_rec tmprec; + struct ocfs2_extent_list *rightmost_el; + struct ocfs2_extent_rec rec; + struct ocfs2_extent_rec split_rec = *orig_split_rec; + struct ocfs2_insert_type insert; + struct ocfs2_extent_block *eb; + +leftright: + /* + * Store a copy of the record on the stack - it might move + * around as the tree is manipulated below. + */ + rec = path_leaf_el(path)->l_recs[split_index]; + + rightmost_el = et->et_root_el; + + depth = le16_to_cpu(rightmost_el->l_tree_depth); + if (depth) { + BUG_ON(!(*last_eb_bh)); + eb = (struct ocfs2_extent_block *) (*last_eb_bh)->b_data; + rightmost_el = &eb->h_list; + } + + if (le16_to_cpu(rightmost_el->l_next_free_rec) == + le16_to_cpu(rightmost_el->l_count)) { + ret = ocfs2_grow_tree(handle, et, + &depth, last_eb_bh, meta_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + memset(&insert, 0, sizeof(struct ocfs2_insert_type)); + insert.ins_appending = APPEND_NONE; + insert.ins_contig = CONTIG_NONE; + insert.ins_tree_depth = depth; + + insert_range = le32_to_cpu(split_rec.e_cpos) + + le16_to_cpu(split_rec.e_leaf_clusters); + rec_range = le32_to_cpu(rec.e_cpos) + + le16_to_cpu(rec.e_leaf_clusters); + + if (split_rec.e_cpos == rec.e_cpos) { + insert.ins_split = SPLIT_LEFT; + } else if (insert_range == rec_range) { + insert.ins_split = SPLIT_RIGHT; + } else { + /* + * Left/right split. We fake this as a right split + * first and then make a second pass as a left split. + */ + insert.ins_split = SPLIT_RIGHT; + + ocfs2_make_right_split_rec(ocfs2_metadata_cache_get_super(et->et_ci), + &tmprec, insert_range, &rec); + + split_rec = tmprec; + + BUG_ON(do_leftright); + do_leftright = 1; + } + + ret = ocfs2_do_insert_extent(handle, et, &split_rec, &insert); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (do_leftright == 1) { + u32 cpos; + struct ocfs2_extent_list *el; + + do_leftright++; + split_rec = *orig_split_rec; + + ocfs2_reinit_path(path, 1); + + cpos = le32_to_cpu(split_rec.e_cpos); + ret = ocfs2_find_path(et->et_ci, path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + el = path_leaf_el(path); + split_index = ocfs2_search_extent_list(el, cpos); + if (split_index == -1) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has an extent at cpos %u " + "which can no longer be found.\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos); + ret = -EROFS; + goto out; + } + goto leftright; + } +out: + + return ret; +} + +static int ocfs2_replace_extent_rec(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + struct ocfs2_extent_list *el, + int split_index, + struct ocfs2_extent_rec *split_rec) +{ + int ret; + + ret = ocfs2_path_bh_journal_access(handle, et->et_ci, path, + path_num_items(path) - 1); + if (ret) { + mlog_errno(ret); + goto out; + } + + el->l_recs[split_index] = *split_rec; + + ocfs2_journal_dirty(handle, path_leaf_bh(path)); +out: + return ret; +} + +/* + * Split part or all of the extent record at split_index in the leaf + * pointed to by path. Merge with the contiguous extent record if needed. + * + * Care is taken to handle contiguousness so as to not grow the tree. + * + * meta_ac is not strictly necessary - we only truly need it if growth + * of the tree is required. All other cases will degrade into a less + * optimal tree layout. + * + * last_eb_bh should be the rightmost leaf block for any extent + * btree. Since a split may grow the tree or a merge might shrink it, + * the caller cannot trust the contents of that buffer after this call. + * + * This code is optimized for readability - several passes might be + * made over certain portions of the tree. All of those blocks will + * have been brought into cache (and pinned via the journal), so the + * extra overhead is not expressed in terms of disk reads. + */ +int ocfs2_split_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + int split_index, + struct ocfs2_extent_rec *split_rec, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int ret = 0; + struct ocfs2_extent_list *el = path_leaf_el(path); + struct buffer_head *last_eb_bh = NULL; + struct ocfs2_extent_rec *rec = &el->l_recs[split_index]; + struct ocfs2_merge_ctxt ctxt; + struct ocfs2_extent_list *rightmost_el; + + if (le32_to_cpu(rec->e_cpos) > le32_to_cpu(split_rec->e_cpos) || + ((le32_to_cpu(rec->e_cpos) + le16_to_cpu(rec->e_leaf_clusters)) < + (le32_to_cpu(split_rec->e_cpos) + le16_to_cpu(split_rec->e_leaf_clusters)))) { + ret = -EIO; + mlog_errno(ret); + goto out; + } + + ctxt.c_contig_type = ocfs2_figure_merge_contig_type(et, path, el, + split_index, + split_rec); + + /* + * The core merge / split code wants to know how much room is + * left in this allocation tree, so we pass the + * rightmost extent list. + */ + if (path->p_tree_depth) { + struct ocfs2_extent_block *eb; + + ret = ocfs2_read_extent_block(et->et_ci, + ocfs2_et_get_last_eb_blk(et), + &last_eb_bh); + if (ret) { + mlog_errno(ret); + goto out; + } + + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + rightmost_el = &eb->h_list; + } else + rightmost_el = path_root_el(path); + + if (rec->e_cpos == split_rec->e_cpos && + rec->e_leaf_clusters == split_rec->e_leaf_clusters) + ctxt.c_split_covers_rec = 1; + else + ctxt.c_split_covers_rec = 0; + + ctxt.c_has_empty_extent = ocfs2_is_empty_extent(&el->l_recs[0]); + + trace_ocfs2_split_extent(split_index, ctxt.c_contig_type, + ctxt.c_has_empty_extent, + ctxt.c_split_covers_rec); + + if (ctxt.c_contig_type == CONTIG_NONE) { + if (ctxt.c_split_covers_rec) + ret = ocfs2_replace_extent_rec(handle, et, path, el, + split_index, split_rec); + else + ret = ocfs2_split_and_insert(handle, et, path, + &last_eb_bh, split_index, + split_rec, meta_ac); + if (ret) + mlog_errno(ret); + } else { + ret = ocfs2_try_to_merge_extent(handle, et, path, + split_index, split_rec, + dealloc, &ctxt); + if (ret) + mlog_errno(ret); + } + +out: + brelse(last_eb_bh); + return ret; +} + +/* + * Change the flags of the already-existing extent at cpos for len clusters. + * + * new_flags: the flags we want to set. + * clear_flags: the flags we want to clear. + * phys: the new physical offset we want this new extent starts from. + * + * If the existing extent is larger than the request, initiate a + * split. An attempt will be made at merging with adjacent extents. + * + * The caller is responsible for passing down meta_ac if we'll need it. + */ +int ocfs2_change_extent_flag(handle_t *handle, + struct ocfs2_extent_tree *et, + u32 cpos, u32 len, u32 phys, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_cached_dealloc_ctxt *dealloc, + int new_flags, int clear_flags) +{ + int ret, index; + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + u64 start_blkno = ocfs2_clusters_to_blocks(sb, phys); + struct ocfs2_extent_rec split_rec; + struct ocfs2_path *left_path = NULL; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + + left_path = ocfs2_new_path_from_et(et); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, left_path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + el = path_leaf_el(left_path); + + index = ocfs2_search_extent_list(el, cpos); + if (index == -1) { + ocfs2_error(sb, + "Owner %llu has an extent at cpos %u which can no " + "longer be found.\n", + (unsigned long long) + ocfs2_metadata_cache_owner(et->et_ci), cpos); + ret = -EROFS; + goto out; + } + + ret = -EIO; + rec = &el->l_recs[index]; + if (new_flags && (rec->e_flags & new_flags)) { + mlog(ML_ERROR, "Owner %llu tried to set %d flags on an " + "extent that already had them", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + new_flags); + goto out; + } + + if (clear_flags && !(rec->e_flags & clear_flags)) { + mlog(ML_ERROR, "Owner %llu tried to clear %d flags on an " + "extent that didn't have them", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + clear_flags); + goto out; + } + + memset(&split_rec, 0, sizeof(struct ocfs2_extent_rec)); + split_rec.e_cpos = cpu_to_le32(cpos); + split_rec.e_leaf_clusters = cpu_to_le16(len); + split_rec.e_blkno = cpu_to_le64(start_blkno); + split_rec.e_flags = rec->e_flags; + if (new_flags) + split_rec.e_flags |= new_flags; + if (clear_flags) + split_rec.e_flags &= ~clear_flags; + + ret = ocfs2_split_extent(handle, et, left_path, + index, &split_rec, meta_ac, + dealloc); + if (ret) + mlog_errno(ret); + +out: + ocfs2_free_path(left_path); + return ret; + +} + +/* + * Mark the already-existing extent at cpos as written for len clusters. + * This removes the unwritten extent flag. + * + * If the existing extent is larger than the request, initiate a + * split. An attempt will be made at merging with adjacent extents. + * + * The caller is responsible for passing down meta_ac if we'll need it. + */ +int ocfs2_mark_extent_written(struct inode *inode, + struct ocfs2_extent_tree *et, + handle_t *handle, u32 cpos, u32 len, u32 phys, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int ret; + + trace_ocfs2_mark_extent_written( + (unsigned long long)OCFS2_I(inode)->ip_blkno, + cpos, len, phys); + + if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) { + ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents " + "that are being written to, but the feature bit " + "is not set in the super block.", + (unsigned long long)OCFS2_I(inode)->ip_blkno); + ret = -EROFS; + goto out; + } + + /* + * XXX: This should be fixed up so that we just re-insert the + * next extent records. + */ + ocfs2_et_extent_map_truncate(et, 0); + + ret = ocfs2_change_extent_flag(handle, et, cpos, + len, phys, meta_ac, dealloc, + 0, OCFS2_EXT_UNWRITTEN); + if (ret) + mlog_errno(ret); + +out: + return ret; +} + +static int ocfs2_split_tree(handle_t *handle, struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + int index, u32 new_range, + struct ocfs2_alloc_context *meta_ac) +{ + int ret, depth, credits; + struct buffer_head *last_eb_bh = NULL; + struct ocfs2_extent_block *eb; + struct ocfs2_extent_list *rightmost_el, *el; + struct ocfs2_extent_rec split_rec; + struct ocfs2_extent_rec *rec; + struct ocfs2_insert_type insert; + + /* + * Setup the record to split before we grow the tree. + */ + el = path_leaf_el(path); + rec = &el->l_recs[index]; + ocfs2_make_right_split_rec(ocfs2_metadata_cache_get_super(et->et_ci), + &split_rec, new_range, rec); + + depth = path->p_tree_depth; + if (depth > 0) { + ret = ocfs2_read_extent_block(et->et_ci, + ocfs2_et_get_last_eb_blk(et), + &last_eb_bh); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; + rightmost_el = &eb->h_list; + } else + rightmost_el = path_leaf_el(path); + + credits = path->p_tree_depth + + ocfs2_extend_meta_needed(et->et_root_el); + ret = ocfs2_extend_trans(handle, credits); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (le16_to_cpu(rightmost_el->l_next_free_rec) == + le16_to_cpu(rightmost_el->l_count)) { + ret = ocfs2_grow_tree(handle, et, &depth, &last_eb_bh, + meta_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + memset(&insert, 0, sizeof(struct ocfs2_insert_type)); + insert.ins_appending = APPEND_NONE; + insert.ins_contig = CONTIG_NONE; + insert.ins_split = SPLIT_RIGHT; + insert.ins_tree_depth = depth; + + ret = ocfs2_do_insert_extent(handle, et, &split_rec, &insert); + if (ret) + mlog_errno(ret); + +out: + brelse(last_eb_bh); + return ret; +} + +static int ocfs2_truncate_rec(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, int index, + struct ocfs2_cached_dealloc_ctxt *dealloc, + u32 cpos, u32 len) +{ + int ret; + u32 left_cpos, rec_range, trunc_range; + int wants_rotate = 0, is_rightmost_tree_rec = 0; + struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); + struct ocfs2_path *left_path = NULL; + struct ocfs2_extent_list *el = path_leaf_el(path); + struct ocfs2_extent_rec *rec; + struct ocfs2_extent_block *eb; + + if (ocfs2_is_empty_extent(&el->l_recs[0]) && index > 0) { + ret = ocfs2_rotate_tree_left(handle, et, path, dealloc); + if (ret) { + mlog_errno(ret); + goto out; + } + + index--; + } + + if (index == (le16_to_cpu(el->l_next_free_rec) - 1) && + path->p_tree_depth) { + /* + * Check whether this is the rightmost tree record. If + * we remove all of this record or part of its right + * edge then an update of the record lengths above it + * will be required. + */ + eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data; + if (eb->h_next_leaf_blk == 0) + is_rightmost_tree_rec = 1; + } + + rec = &el->l_recs[index]; + if (index == 0 && path->p_tree_depth && + le32_to_cpu(rec->e_cpos) == cpos) { + /* + * Changing the leftmost offset (via partial or whole + * record truncate) of an interior (or rightmost) path + * means we have to update the subtree that is formed + * by this leaf and the one to it's left. + * + * There are two cases we can skip: + * 1) Path is the leftmost one in our btree. + * 2) The leaf is rightmost and will be empty after + * we remove the extent record - the rotate code + * knows how to update the newly formed edge. + */ + + ret = ocfs2_find_cpos_for_left_leaf(sb, path, &left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (left_cpos && le16_to_cpu(el->l_next_free_rec) > 1) { + left_path = ocfs2_new_path_from_path(path); + if (!left_path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, left_path, + left_cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + } + } + + ret = ocfs2_extend_rotate_transaction(handle, 0, + handle->h_buffer_credits, + path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, path); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_path(et->et_ci, handle, left_path); + if (ret) { + mlog_errno(ret); + goto out; + } + + rec_range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); + trunc_range = cpos + len; + + if (le32_to_cpu(rec->e_cpos) == cpos && rec_range == trunc_range) { + int next_free; + + memset(rec, 0, sizeof(*rec)); + ocfs2_cleanup_merge(el, index); + wants_rotate = 1; + + next_free = le16_to_cpu(el->l_next_free_rec); + if (is_rightmost_tree_rec && next_free > 1) { + /* + * We skip the edge update if this path will + * be deleted by the rotate code. + */ + rec = &el->l_recs[next_free - 1]; + ocfs2_adjust_rightmost_records(handle, et, path, + rec); + } + } else if (le32_to_cpu(rec->e_cpos) == cpos) { + /* Remove leftmost portion of the record. */ + le32_add_cpu(&rec->e_cpos, len); + le64_add_cpu(&rec->e_blkno, ocfs2_clusters_to_blocks(sb, len)); + le16_add_cpu(&rec->e_leaf_clusters, -len); + } else if (rec_range == trunc_range) { + /* Remove rightmost portion of the record */ + le16_add_cpu(&rec->e_leaf_clusters, -len); + if (is_rightmost_tree_rec) + ocfs2_adjust_rightmost_records(handle, et, path, rec); + } else { + /* Caller should have trapped this. */ + mlog(ML_ERROR, "Owner %llu: Invalid record truncate: (%u, %u) " + "(%u, %u)\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + le32_to_cpu(rec->e_cpos), + le16_to_cpu(rec->e_leaf_clusters), cpos, len); + BUG(); + } + + if (left_path) { + int subtree_index; + + subtree_index = ocfs2_find_subtree_root(et, left_path, path); + ocfs2_complete_edge_insert(handle, left_path, path, + subtree_index); + } + + ocfs2_journal_dirty(handle, path_leaf_bh(path)); + + ret = ocfs2_rotate_tree_left(handle, et, path, dealloc); + if (ret) { + mlog_errno(ret); + goto out; + } + +out: + ocfs2_free_path(left_path); + return ret; +} + +int ocfs2_remove_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + u32 cpos, u32 len, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_cached_dealloc_ctxt *dealloc) +{ + int ret, index; + u32 rec_range, trunc_range; + struct ocfs2_extent_rec *rec; + struct ocfs2_extent_list *el; + struct ocfs2_path *path = NULL; + + /* + * XXX: Why are we truncating to 0 instead of wherever this + * affects us? + */ + ocfs2_et_extent_map_truncate(et, 0); + + path = ocfs2_new_path_from_et(et); + if (!path) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + ret = ocfs2_find_path(et->et_ci, path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + el = path_leaf_el(path); + index = ocfs2_search_extent_list(el, cpos); + if (index == -1) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu has an extent at cpos %u which can no " + "longer be found.\n", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos); + ret = -EROFS; + goto out; + } + + /* + * We have 3 cases of extent removal: + * 1) Range covers the entire extent rec + * 2) Range begins or ends on one edge of the extent rec + * 3) Range is in the middle of the extent rec (no shared edges) + * + * For case 1 we remove the extent rec and left rotate to + * fill the hole. + * + * For case 2 we just shrink the existing extent rec, with a + * tree update if the shrinking edge is also the edge of an + * extent block. + * + * For case 3 we do a right split to turn the extent rec into + * something case 2 can handle. + */ + rec = &el->l_recs[index]; + rec_range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); + trunc_range = cpos + len; + + BUG_ON(cpos < le32_to_cpu(rec->e_cpos) || trunc_range > rec_range); + + trace_ocfs2_remove_extent( + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos, len, index, le32_to_cpu(rec->e_cpos), + ocfs2_rec_clusters(el, rec)); + + if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) { + ret = ocfs2_truncate_rec(handle, et, path, index, dealloc, + cpos, len); + if (ret) { + mlog_errno(ret); + goto out; + } + } else { + ret = ocfs2_split_tree(handle, et, path, index, + trunc_range, meta_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * The split could have manipulated the tree enough to + * move the record location, so we have to look for it again. + */ + ocfs2_reinit_path(path, 1); + + ret = ocfs2_find_path(et->et_ci, path, cpos); + if (ret) { + mlog_errno(ret); + goto out; + } + + el = path_leaf_el(path); + index = ocfs2_search_extent_list(el, cpos); + if (index == -1) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu: split at cpos %u lost record.", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos); + ret = -EROFS; + goto out; + } + + /* + * Double check our values here. If anything is fishy, + * it's easier to catch it at the top level. + */ + rec = &el->l_recs[index]; + rec_range = le32_to_cpu(rec->e_cpos) + + ocfs2_rec_clusters(el, rec); + if (rec_range != trunc_range) { + ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci), + "Owner %llu: error after split at cpos %u" + "trunc len %u, existing record is (%u,%u)", + (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), + cpos, len, le32_to_cpu(rec->e_cpos), + ocfs2_rec_clusters(el, rec)); + ret = -EROFS; + goto out; + } + + ret = ocfs2_truncate_rec(handle, et, path, index, dealloc, + cpos, len); + if (ret) { + mlog_errno(ret); + goto out; + } + } + +out: + ocfs2_free_path(path); + return ret; +} + +/* + * ocfs2_reserve_blocks_for_rec_trunc() would look basically the + * same as ocfs2_lock_alloctors(), except for it accepts a blocks + * number to reserve some extra blocks, and it only handles meta + * data allocations. + * + * Currently, only ocfs2_remove_btree_range() uses it for truncating + * and punching holes. + */ +static int ocfs2_reserve_blocks_for_rec_trunc(struct inode *inode, + struct ocfs2_extent_tree *et, + u32 extents_to_split, + struct ocfs2_alloc_context **ac, + int extra_blocks) +{ + int ret = 0, num_free_extents; + unsigned int max_recs_needed = 2 * extents_to_split; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + *ac = NULL; + + num_free_extents = ocfs2_num_free_extents(osb, et); + if (num_free_extents < 0) { + ret = num_free_extents; + mlog_errno(ret); + goto out; + } + + if (!num_free_extents || + (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) + extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); + + if (extra_blocks) { + ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, ac); + if (ret < 0) { + if (ret != -ENOSPC) + mlog_errno(ret); + goto out; + } + } + +out: + if (ret) { + if (*ac) { + ocfs2_free_alloc_context(*ac); + *ac = NULL; + } + } + + return ret; +} + +int ocfs2_remove_btree_range(struct inode *inode, + struct ocfs2_extent_tree *et, + u32 cpos, u32 phys_cpos, u32 len, int flags, + struct ocfs2_cached_dealloc_ctxt *dealloc, + u64 refcount_loc, bool refcount_tree_locked) +{ + int ret, credits = 0, extra_blocks = 0; + u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct inode *tl_inode = osb->osb_tl_inode; + handle_t *handle; + struct ocfs2_alloc_context *meta_ac = NULL; + struct ocfs2_refcount_tree *ref_tree = NULL; + + if ((flags & OCFS2_EXT_REFCOUNTED) && len) { + BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & + OCFS2_HAS_REFCOUNT_FL)); + + if (!refcount_tree_locked) { + ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1, + &ref_tree, NULL); + if (ret) { + mlog_errno(ret); + goto bail; + } + } + + ret = ocfs2_prepare_refcount_change_for_del(inode, + refcount_loc, + phys_blkno, + len, + &credits, + &extra_blocks); + if (ret < 0) { + mlog_errno(ret); + goto bail; + } + } + + ret = ocfs2_reserve_blocks_for_rec_trunc(inode, et, 1, &meta_ac, + extra_blocks); + if (ret) { + mlog_errno(ret); + goto bail; + } + + mutex_lock(&tl_inode->i_mutex); + + if (ocfs2_truncate_log_needs_flush(osb)) { + ret = __ocfs2_flush_truncate_log(osb); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + handle = ocfs2_start_trans(osb, + ocfs2_remove_extent_credits(osb->sb) + credits); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out; + } + + ret = ocfs2_et_root_journal_access(handle, et, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + dquot_free_space_nodirty(inode, + ocfs2_clusters_to_bytes(inode->i_sb, len)); + + ret = ocfs2_remove_extent(handle, et, cpos, len, meta_ac, dealloc); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + ocfs2_et_update_clusters(et, -len); + ocfs2_update_inode_fsync_trans(handle, inode, 1); + + ocfs2_journal_dirty(handle, et->et_root_bh); + + if (phys_blkno) { + if (flags & OCFS2_EXT_REFCOUNTED) + ret = ocfs2_decrease_refcount(inode, handle, + ocfs2_blocks_to_clusters(osb->sb, + phys_blkno), + len, meta_ac, + dealloc, 1); + else + ret = ocfs2_truncate_log_append(osb, handle, + phys_blkno, len); + if (ret) + mlog_errno(ret); + + } + +out_commit: + ocfs2_commit_trans(osb, handle); +out: + mutex_unlock(&tl_inode->i_mutex); +bail: + if (meta_ac) + ocfs2_free_alloc_context(meta_ac); + + if (ref_tree) + ocfs2_unlock_refcount_tree(osb, ref_tree, 1); + + return ret; +} + +int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb) +{ + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + + mlog_bug_on_msg(le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count), + "slot %d, invalid truncate log parameters: used = " + "%u, count = %u\n", osb->slot_num, + le16_to_cpu(tl->tl_used), le16_to_cpu(tl->tl_count)); + return le16_to_cpu(tl->tl_used) == le16_to_cpu(tl->tl_count); +} + +static int ocfs2_truncate_log_can_coalesce(struct ocfs2_truncate_log *tl, + unsigned int new_start) +{ + unsigned int tail_index; + unsigned int current_tail; + + /* No records, nothing to coalesce */ + if (!le16_to_cpu(tl->tl_used)) + return 0; + + tail_index = le16_to_cpu(tl->tl_used) - 1; + current_tail = le32_to_cpu(tl->tl_recs[tail_index].t_start); + current_tail += le32_to_cpu(tl->tl_recs[tail_index].t_clusters); + + return current_tail == new_start; +} + +int ocfs2_truncate_log_append(struct ocfs2_super *osb, + handle_t *handle, + u64 start_blk, + unsigned int num_clusters) +{ + int status, index; + unsigned int start_cluster, tl_count; + struct inode *tl_inode = osb->osb_tl_inode; + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + BUG_ON(mutex_trylock(&tl_inode->i_mutex)); + + start_cluster = ocfs2_blocks_to_clusters(osb->sb, start_blk); + + di = (struct ocfs2_dinode *) tl_bh->b_data; + + /* tl_bh is loaded from ocfs2_truncate_log_init(). It's validated + * by the underlying call to ocfs2_read_inode_block(), so any + * corruption is a code bug */ + BUG_ON(!OCFS2_IS_VALID_DINODE(di)); + + tl = &di->id2.i_dealloc; + tl_count = le16_to_cpu(tl->tl_count); + mlog_bug_on_msg(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) || + tl_count == 0, + "Truncate record count on #%llu invalid " + "wanted %u, actual %u\n", + (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, + ocfs2_truncate_recs_per_inode(osb->sb), + le16_to_cpu(tl->tl_count)); + + /* Caller should have known to flush before calling us. */ + index = le16_to_cpu(tl->tl_used); + if (index >= tl_count) { + status = -ENOSPC; + mlog_errno(status); + goto bail; + } + + status = ocfs2_journal_access_di(handle, INODE_CACHE(tl_inode), tl_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + trace_ocfs2_truncate_log_append( + (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, index, + start_cluster, num_clusters); + if (ocfs2_truncate_log_can_coalesce(tl, start_cluster)) { + /* + * Move index back to the record we are coalescing with. + * ocfs2_truncate_log_can_coalesce() guarantees nonzero + */ + index--; + + num_clusters += le32_to_cpu(tl->tl_recs[index].t_clusters); + trace_ocfs2_truncate_log_append( + (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, + index, le32_to_cpu(tl->tl_recs[index].t_start), + num_clusters); + } else { + tl->tl_recs[index].t_start = cpu_to_le32(start_cluster); + tl->tl_used = cpu_to_le16(index + 1); + } + tl->tl_recs[index].t_clusters = cpu_to_le32(num_clusters); + + ocfs2_journal_dirty(handle, tl_bh); + + osb->truncated_clusters += num_clusters; +bail: + return status; +} + +static int ocfs2_replay_truncate_records(struct ocfs2_super *osb, + handle_t *handle, + struct inode *data_alloc_inode, + struct buffer_head *data_alloc_bh) +{ + int status = 0; + int i; + unsigned int num_clusters; + u64 start_blk; + struct ocfs2_truncate_rec rec; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + struct inode *tl_inode = osb->osb_tl_inode; + struct buffer_head *tl_bh = osb->osb_tl_bh; + + di = (struct ocfs2_dinode *) tl_bh->b_data; + tl = &di->id2.i_dealloc; + i = le16_to_cpu(tl->tl_used) - 1; + while (i >= 0) { + /* Caller has given us at least enough credits to + * update the truncate log dinode */ + status = ocfs2_journal_access_di(handle, INODE_CACHE(tl_inode), tl_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + tl->tl_used = cpu_to_le16(i); + + ocfs2_journal_dirty(handle, tl_bh); + + /* TODO: Perhaps we can calculate the bulk of the + * credits up front rather than extending like + * this. */ + status = ocfs2_extend_trans(handle, + OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + rec = tl->tl_recs[i]; + start_blk = ocfs2_clusters_to_blocks(data_alloc_inode->i_sb, + le32_to_cpu(rec.t_start)); + num_clusters = le32_to_cpu(rec.t_clusters); + + /* if start_blk is not set, we ignore the record as + * invalid. */ + if (start_blk) { + trace_ocfs2_replay_truncate_records( + (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, + i, le32_to_cpu(rec.t_start), num_clusters); + + status = ocfs2_free_clusters(handle, data_alloc_inode, + data_alloc_bh, start_blk, + num_clusters); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + i--; + } + + osb->truncated_clusters = 0; + +bail: + return status; +} + +/* Expects you to already be holding tl_inode->i_mutex */ +int __ocfs2_flush_truncate_log(struct ocfs2_super *osb) +{ + int status; + unsigned int num_to_flush; + handle_t *handle; + struct inode *tl_inode = osb->osb_tl_inode; + struct inode *data_alloc_inode = NULL; + struct buffer_head *tl_bh = osb->osb_tl_bh; + struct buffer_head *data_alloc_bh = NULL; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + BUG_ON(mutex_trylock(&tl_inode->i_mutex)); + + di = (struct ocfs2_dinode *) tl_bh->b_data; + + /* tl_bh is loaded from ocfs2_truncate_log_init(). It's validated + * by the underlying call to ocfs2_read_inode_block(), so any + * corruption is a code bug */ + BUG_ON(!OCFS2_IS_VALID_DINODE(di)); + + tl = &di->id2.i_dealloc; + num_to_flush = le16_to_cpu(tl->tl_used); + trace_ocfs2_flush_truncate_log( + (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, + num_to_flush); + if (!num_to_flush) { + status = 0; + goto out; + } + + data_alloc_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!data_alloc_inode) { + status = -EINVAL; + mlog(ML_ERROR, "Could not get bitmap inode!\n"); + goto out; + } + + mutex_lock(&data_alloc_inode->i_mutex); + + status = ocfs2_inode_lock(data_alloc_inode, &data_alloc_bh, 1); + if (status < 0) { + mlog_errno(status); + goto out_mutex; + } + + handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto out_unlock; + } + + status = ocfs2_replay_truncate_records(osb, handle, data_alloc_inode, + data_alloc_bh); + if (status < 0) + mlog_errno(status); + + ocfs2_commit_trans(osb, handle); + +out_unlock: + brelse(data_alloc_bh); + ocfs2_inode_unlock(data_alloc_inode, 1); + +out_mutex: + mutex_unlock(&data_alloc_inode->i_mutex); + iput(data_alloc_inode); + +out: + return status; +} + +int ocfs2_flush_truncate_log(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = osb->osb_tl_inode; + + mutex_lock(&tl_inode->i_mutex); + status = __ocfs2_flush_truncate_log(osb); + mutex_unlock(&tl_inode->i_mutex); + + return status; +} + +static void ocfs2_truncate_log_worker(struct work_struct *work) +{ + int status; + struct ocfs2_super *osb = + container_of(work, struct ocfs2_super, + osb_truncate_log_wq.work); + + status = ocfs2_flush_truncate_log(osb); + if (status < 0) + mlog_errno(status); + else + ocfs2_init_steal_slots(osb); +} + +#define OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL (2 * HZ) +void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, + int cancel) +{ + if (osb->osb_tl_inode && + atomic_read(&osb->osb_tl_disable) == 0) { + /* We want to push off log flushes while truncates are + * still running. */ + if (cancel) + cancel_delayed_work(&osb->osb_truncate_log_wq); + + queue_delayed_work(ocfs2_wq, &osb->osb_truncate_log_wq, + OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL); + } +} + +static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb, + int slot_num, + struct inode **tl_inode, + struct buffer_head **tl_bh) +{ + int status; + struct inode *inode = NULL; + struct buffer_head *bh = NULL; + + inode = ocfs2_get_system_file_inode(osb, + TRUNCATE_LOG_SYSTEM_INODE, + slot_num); + if (!inode) { + status = -EINVAL; + mlog(ML_ERROR, "Could not get load truncate log inode!\n"); + goto bail; + } + + status = ocfs2_read_inode_block(inode, &bh); + if (status < 0) { + iput(inode); + mlog_errno(status); + goto bail; + } + + *tl_inode = inode; + *tl_bh = bh; +bail: + return status; +} + +/* called during the 1st stage of node recovery. we stamp a clean + * truncate log and pass back a copy for processing later. if the + * truncate log does not require processing, a *tl_copy is set to + * NULL. */ +int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, + int slot_num, + struct ocfs2_dinode **tl_copy) +{ + int status; + struct inode *tl_inode = NULL; + struct buffer_head *tl_bh = NULL; + struct ocfs2_dinode *di; + struct ocfs2_truncate_log *tl; + + *tl_copy = NULL; + + trace_ocfs2_begin_truncate_log_recovery(slot_num); + + status = ocfs2_get_truncate_log_info(osb, slot_num, &tl_inode, &tl_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + di = (struct ocfs2_dinode *) tl_bh->b_data; + + /* tl_bh is loaded from ocfs2_get_truncate_log_info(). It's + * validated by the underlying call to ocfs2_read_inode_block(), + * so any corruption is a code bug */ + BUG_ON(!OCFS2_IS_VALID_DINODE(di)); + + tl = &di->id2.i_dealloc; + if (le16_to_cpu(tl->tl_used)) { + trace_ocfs2_truncate_log_recovery_num(le16_to_cpu(tl->tl_used)); + + *tl_copy = kmalloc(tl_bh->b_size, GFP_KERNEL); + if (!(*tl_copy)) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* Assuming the write-out below goes well, this copy + * will be passed back to recovery for processing. */ + memcpy(*tl_copy, tl_bh->b_data, tl_bh->b_size); + + /* All we need to do to clear the truncate log is set + * tl_used. */ + tl->tl_used = 0; + + ocfs2_compute_meta_ecc(osb->sb, tl_bh->b_data, &di->i_check); + status = ocfs2_write_block(osb, tl_bh, INODE_CACHE(tl_inode)); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + +bail: + if (tl_inode) + iput(tl_inode); + brelse(tl_bh); + + if (status < 0 && (*tl_copy)) { + kfree(*tl_copy); + *tl_copy = NULL; + mlog_errno(status); + } + + return status; +} + +int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, + struct ocfs2_dinode *tl_copy) +{ + int status = 0; + int i; + unsigned int clusters, num_recs, start_cluster; + u64 start_blk; + handle_t *handle; + struct inode *tl_inode = osb->osb_tl_inode; + struct ocfs2_truncate_log *tl; + + if (OCFS2_I(tl_inode)->ip_blkno == le64_to_cpu(tl_copy->i_blkno)) { + mlog(ML_ERROR, "Asked to recover my own truncate log!\n"); + return -EINVAL; + } + + tl = &tl_copy->id2.i_dealloc; + num_recs = le16_to_cpu(tl->tl_used); + trace_ocfs2_complete_truncate_log_recovery( + (unsigned long long)le64_to_cpu(tl_copy->i_blkno), + num_recs); + + mutex_lock(&tl_inode->i_mutex); + for(i = 0; i < num_recs; i++) { + if (ocfs2_truncate_log_needs_flush(osb)) { + status = __ocfs2_flush_truncate_log(osb); + if (status < 0) { + mlog_errno(status); + goto bail_up; + } + } + + handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + mlog_errno(status); + goto bail_up; + } + + clusters = le32_to_cpu(tl->tl_recs[i].t_clusters); + start_cluster = le32_to_cpu(tl->tl_recs[i].t_start); + start_blk = ocfs2_clusters_to_blocks(osb->sb, start_cluster); + + status = ocfs2_truncate_log_append(osb, handle, + start_blk, clusters); + ocfs2_commit_trans(osb, handle); + if (status < 0) { + mlog_errno(status); + goto bail_up; + } + } + +bail_up: + mutex_unlock(&tl_inode->i_mutex); + + return status; +} + +void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = osb->osb_tl_inode; + + atomic_set(&osb->osb_tl_disable, 1); + + if (tl_inode) { + cancel_delayed_work(&osb->osb_truncate_log_wq); + flush_workqueue(ocfs2_wq); + + status = ocfs2_flush_truncate_log(osb); + if (status < 0) + mlog_errno(status); + + brelse(osb->osb_tl_bh); + iput(osb->osb_tl_inode); + } +} + +int ocfs2_truncate_log_init(struct ocfs2_super *osb) +{ + int status; + struct inode *tl_inode = NULL; + struct buffer_head *tl_bh = NULL; + + status = ocfs2_get_truncate_log_info(osb, + osb->slot_num, + &tl_inode, + &tl_bh); + if (status < 0) + mlog_errno(status); + + /* ocfs2_truncate_log_shutdown keys on the existence of + * osb->osb_tl_inode so we don't set any of the osb variables + * until we're sure all is well. */ + INIT_DELAYED_WORK(&osb->osb_truncate_log_wq, + ocfs2_truncate_log_worker); + atomic_set(&osb->osb_tl_disable, 0); + osb->osb_tl_bh = tl_bh; + osb->osb_tl_inode = tl_inode; + + return status; +} + +/* + * Delayed de-allocation of suballocator blocks. + * + * Some sets of block de-allocations might involve multiple suballocator inodes. + * + * The locking for this can get extremely complicated, especially when + * the suballocator inodes to delete from aren't known until deep + * within an unrelated codepath. + * + * ocfs2_extent_block structures are a good example of this - an inode + * btree could have been grown by any number of nodes each allocating + * out of their own suballoc inode. + * + * These structures allow the delay of block de-allocation until a + * later time, when locking of multiple cluster inodes won't cause + * deadlock. + */ + +/* + * Describe a single bit freed from a suballocator. For the block + * suballocators, it represents one block. For the global cluster + * allocator, it represents some clusters and free_bit indicates + * clusters number. + */ +struct ocfs2_cached_block_free { + struct ocfs2_cached_block_free *free_next; + u64 free_bg; + u64 free_blk; + unsigned int free_bit; +}; + +struct ocfs2_per_slot_free_list { + struct ocfs2_per_slot_free_list *f_next_suballocator; + int f_inode_type; + int f_slot; + struct ocfs2_cached_block_free *f_first; +}; + +static int ocfs2_free_cached_blocks(struct ocfs2_super *osb, + int sysfile_type, + int slot, + struct ocfs2_cached_block_free *head) +{ + int ret; + u64 bg_blkno; + handle_t *handle; + struct inode *inode; + struct buffer_head *di_bh = NULL; + struct ocfs2_cached_block_free *tmp; + + inode = ocfs2_get_system_file_inode(osb, sysfile_type, slot); + if (!inode) { + ret = -EINVAL; + mlog_errno(ret); + goto out; + } + + mutex_lock(&inode->i_mutex); + + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret) { + mlog_errno(ret); + goto out_mutex; + } + + handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out_unlock; + } + + while (head) { + if (head->free_bg) + bg_blkno = head->free_bg; + else + bg_blkno = ocfs2_which_suballoc_group(head->free_blk, + head->free_bit); + trace_ocfs2_free_cached_blocks( + (unsigned long long)head->free_blk, head->free_bit); + + ret = ocfs2_free_suballoc_bits(handle, inode, di_bh, + head->free_bit, bg_blkno, 1); + if (ret) { + mlog_errno(ret); + goto out_journal; + } + + ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE); + if (ret) { + mlog_errno(ret); + goto out_journal; + } + + tmp = head; + head = head->free_next; + kfree(tmp); + } + +out_journal: + ocfs2_commit_trans(osb, handle); + +out_unlock: + ocfs2_inode_unlock(inode, 1); + brelse(di_bh); +out_mutex: + mutex_unlock(&inode->i_mutex); + iput(inode); +out: + while(head) { + /* Premature exit may have left some dangling items. */ + tmp = head; + head = head->free_next; + kfree(tmp); + } + + return ret; +} + +int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt, + u64 blkno, unsigned int bit) +{ + int ret = 0; + struct ocfs2_cached_block_free *item; + + item = kzalloc(sizeof(*item), GFP_NOFS); + if (item == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + return ret; + } + + trace_ocfs2_cache_cluster_dealloc((unsigned long long)blkno, bit); + + item->free_blk = blkno; + item->free_bit = bit; + item->free_next = ctxt->c_global_allocator; + + ctxt->c_global_allocator = item; + return ret; +} + +static int ocfs2_free_cached_clusters(struct ocfs2_super *osb, + struct ocfs2_cached_block_free *head) +{ + struct ocfs2_cached_block_free *tmp; + struct inode *tl_inode = osb->osb_tl_inode; + handle_t *handle; + int ret = 0; + + mutex_lock(&tl_inode->i_mutex); + + while (head) { + if (ocfs2_truncate_log_needs_flush(osb)) { + ret = __ocfs2_flush_truncate_log(osb); + if (ret < 0) { + mlog_errno(ret); + break; + } + } + + handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + break; + } + + ret = ocfs2_truncate_log_append(osb, handle, head->free_blk, + head->free_bit); + + ocfs2_commit_trans(osb, handle); + tmp = head; + head = head->free_next; + kfree(tmp); + + if (ret < 0) { + mlog_errno(ret); + break; + } + } + + mutex_unlock(&tl_inode->i_mutex); + + while (head) { + /* Premature exit may have left some dangling items. */ + tmp = head; + head = head->free_next; + kfree(tmp); + } + + return ret; +} + +int ocfs2_run_deallocs(struct ocfs2_super *osb, + struct ocfs2_cached_dealloc_ctxt *ctxt) +{ + int ret = 0, ret2; + struct ocfs2_per_slot_free_list *fl; + + if (!ctxt) + return 0; + + while (ctxt->c_first_suballocator) { + fl = ctxt->c_first_suballocator; + + if (fl->f_first) { + trace_ocfs2_run_deallocs(fl->f_inode_type, + fl->f_slot); + ret2 = ocfs2_free_cached_blocks(osb, + fl->f_inode_type, + fl->f_slot, + fl->f_first); + if (ret2) + mlog_errno(ret2); + if (!ret) + ret = ret2; + } + + ctxt->c_first_suballocator = fl->f_next_suballocator; + kfree(fl); + } + + if (ctxt->c_global_allocator) { + ret2 = ocfs2_free_cached_clusters(osb, + ctxt->c_global_allocator); + if (ret2) + mlog_errno(ret2); + if (!ret) + ret = ret2; + + ctxt->c_global_allocator = NULL; + } + + return ret; +} + +static struct ocfs2_per_slot_free_list * +ocfs2_find_per_slot_free_list(int type, + int slot, + struct ocfs2_cached_dealloc_ctxt *ctxt) +{ + struct ocfs2_per_slot_free_list *fl = ctxt->c_first_suballocator; + + while (fl) { + if (fl->f_inode_type == type && fl->f_slot == slot) + return fl; + + fl = fl->f_next_suballocator; + } + + fl = kmalloc(sizeof(*fl), GFP_NOFS); + if (fl) { + fl->f_inode_type = type; + fl->f_slot = slot; + fl->f_first = NULL; + fl->f_next_suballocator = ctxt->c_first_suballocator; + + ctxt->c_first_suballocator = fl; + } + return fl; +} + +int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt, + int type, int slot, u64 suballoc, + u64 blkno, unsigned int bit) +{ + int ret; + struct ocfs2_per_slot_free_list *fl; + struct ocfs2_cached_block_free *item; + + fl = ocfs2_find_per_slot_free_list(type, slot, ctxt); + if (fl == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + item = kzalloc(sizeof(*item), GFP_NOFS); + if (item == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + trace_ocfs2_cache_block_dealloc(type, slot, + (unsigned long long)suballoc, + (unsigned long long)blkno, bit); + + item->free_bg = suballoc; + item->free_blk = blkno; + item->free_bit = bit; + item->free_next = fl->f_first; + + fl->f_first = item; + + ret = 0; +out: + return ret; +} + +static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt, + struct ocfs2_extent_block *eb) +{ + return ocfs2_cache_block_dealloc(ctxt, EXTENT_ALLOC_SYSTEM_INODE, + le16_to_cpu(eb->h_suballoc_slot), + le64_to_cpu(eb->h_suballoc_loc), + le64_to_cpu(eb->h_blkno), + le16_to_cpu(eb->h_suballoc_bit)); +} + +static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh) +{ + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + return 0; +} + +void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle, + unsigned int from, unsigned int to, + struct page *page, int zero, u64 *phys) +{ + int ret, partial = 0; + + ret = ocfs2_map_page_blocks(page, phys, inode, from, to, 0); + if (ret) + mlog_errno(ret); + + if (zero) + zero_user_segment(page, from, to); + + /* + * Need to set the buffers we zero'd into uptodate + * here if they aren't - ocfs2_map_page_blocks() + * might've skipped some + */ + ret = walk_page_buffers(handle, page_buffers(page), + from, to, &partial, + ocfs2_zero_func); + if (ret < 0) + mlog_errno(ret); + else if (ocfs2_should_order_data(inode)) { + ret = ocfs2_jbd2_file_inode(handle, inode); + if (ret < 0) + mlog_errno(ret); + } + + if (!partial) + SetPageUptodate(page); + + flush_dcache_page(page); +} + +static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t start, + loff_t end, struct page **pages, + int numpages, u64 phys, handle_t *handle) +{ + int i; + struct page *page; + unsigned int from, to = PAGE_CACHE_SIZE; + struct super_block *sb = inode->i_sb; + + BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(sb))); + + if (numpages == 0) + goto out; + + to = PAGE_CACHE_SIZE; + for(i = 0; i < numpages; i++) { + page = pages[i]; + + from = start & (PAGE_CACHE_SIZE - 1); + if ((end >> PAGE_CACHE_SHIFT) == page->index) + to = end & (PAGE_CACHE_SIZE - 1); + + BUG_ON(from > PAGE_CACHE_SIZE); + BUG_ON(to > PAGE_CACHE_SIZE); + + ocfs2_map_and_dirty_page(inode, handle, from, to, page, 1, + &phys); + + start = (page->index + 1) << PAGE_CACHE_SHIFT; + } +out: + if (pages) + ocfs2_unlock_and_free_pages(pages, numpages); +} + +int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end, + struct page **pages, int *num) +{ + int numpages, ret = 0; + struct address_space *mapping = inode->i_mapping; + unsigned long index; + loff_t last_page_bytes; + + BUG_ON(start > end); + + numpages = 0; + last_page_bytes = PAGE_ALIGN(end); + index = start >> PAGE_CACHE_SHIFT; + do { + pages[numpages] = find_or_create_page(mapping, index, GFP_NOFS); + if (!pages[numpages]) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + numpages++; + index++; + } while (index < (last_page_bytes >> PAGE_CACHE_SHIFT)); + +out: + if (ret != 0) { + if (pages) + ocfs2_unlock_and_free_pages(pages, numpages); + numpages = 0; + } + + *num = numpages; + + return ret; +} + +static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end, + struct page **pages, int *num) +{ + struct super_block *sb = inode->i_sb; + + BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits != + (end - 1) >> OCFS2_SB(sb)->s_clustersize_bits); + + return ocfs2_grab_pages(inode, start, end, pages, num); +} + +/* + * Zero the area past i_size but still within an allocated + * cluster. This avoids exposing nonzero data on subsequent file + * extends. + * + * We need to call this before i_size is updated on the inode because + * otherwise block_write_full_page() will skip writeout of pages past + * i_size. The new_i_size parameter is passed for this reason. + */ +int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle, + u64 range_start, u64 range_end) +{ + int ret = 0, numpages; + struct page **pages = NULL; + u64 phys; + unsigned int ext_flags; + struct super_block *sb = inode->i_sb; + + /* + * File systems which don't support sparse files zero on every + * extend. + */ + if (!ocfs2_sparse_alloc(OCFS2_SB(sb))) + return 0; + + pages = kcalloc(ocfs2_pages_per_cluster(sb), + sizeof(struct page *), GFP_NOFS); + if (pages == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + if (range_start == range_end) + goto out; + + ret = ocfs2_extent_map_get_blocks(inode, + range_start >> sb->s_blocksize_bits, + &phys, NULL, &ext_flags); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * Tail is a hole, or is marked unwritten. In either case, we + * can count on read and write to return/push zero's. + */ + if (phys == 0 || ext_flags & OCFS2_EXT_UNWRITTEN) + goto out; + + ret = ocfs2_grab_eof_pages(inode, range_start, range_end, pages, + &numpages); + if (ret) { + mlog_errno(ret); + goto out; + } + + ocfs2_zero_cluster_pages(inode, range_start, range_end, pages, + numpages, phys, handle); + + /* + * Initiate writeout of the pages we zero'd here. We don't + * wait on them - the truncate_inode_pages() call later will + * do that for us. + */ + ret = filemap_fdatawrite_range(inode->i_mapping, range_start, + range_end - 1); + if (ret) + mlog_errno(ret); + +out: + kfree(pages); + + return ret; +} + +static void ocfs2_zero_dinode_id2_with_xattr(struct inode *inode, + struct ocfs2_dinode *di) +{ + unsigned int blocksize = 1 << inode->i_sb->s_blocksize_bits; + unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); + + if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) + memset(&di->id2, 0, blocksize - + offsetof(struct ocfs2_dinode, id2) - + xattrsize); + else + memset(&di->id2, 0, blocksize - + offsetof(struct ocfs2_dinode, id2)); +} + +void ocfs2_dinode_new_extent_list(struct inode *inode, + struct ocfs2_dinode *di) +{ + ocfs2_zero_dinode_id2_with_xattr(inode, di); + di->id2.i_list.l_tree_depth = 0; + di->id2.i_list.l_next_free_rec = 0; + di->id2.i_list.l_count = cpu_to_le16( + ocfs2_extent_recs_per_inode_with_xattr(inode->i_sb, di)); +} + +void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_inline_data *idata = &di->id2.i_data; + + spin_lock(&oi->ip_lock); + oi->ip_dyn_features |= OCFS2_INLINE_DATA_FL; + di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); + spin_unlock(&oi->ip_lock); + + /* + * We clear the entire i_data structure here so that all + * fields can be properly initialized. + */ + ocfs2_zero_dinode_id2_with_xattr(inode, di); + + idata->id_count = cpu_to_le16( + ocfs2_max_inline_data_with_xattr(inode->i_sb, di)); +} + +int ocfs2_convert_inline_data_to_extents(struct inode *inode, + struct buffer_head *di_bh) +{ + int ret, i, has_data, num_pages = 0; + int need_free = 0; + u32 bit_off, num; + handle_t *handle; + u64 uninitialized_var(block); + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + struct ocfs2_alloc_context *data_ac = NULL; + struct page **pages = NULL; + loff_t end = osb->s_clustersize; + struct ocfs2_extent_tree et; + int did_quota = 0; + + has_data = i_size_read(inode) ? 1 : 0; + + if (has_data) { + pages = kcalloc(ocfs2_pages_per_cluster(osb->sb), + sizeof(struct page *), GFP_NOFS); + if (pages == NULL) { + ret = -ENOMEM; + mlog_errno(ret); + return ret; + } + + ret = ocfs2_reserve_clusters(osb, 1, &data_ac); + if (ret) { + mlog_errno(ret); + goto free_pages; + } + } + + handle = ocfs2_start_trans(osb, + ocfs2_inline_to_extents_credits(osb->sb)); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + if (has_data) { + unsigned int page_end; + u64 phys; + + ret = dquot_alloc_space_nodirty(inode, + ocfs2_clusters_to_bytes(osb->sb, 1)); + if (ret) + goto out_commit; + did_quota = 1; + + data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; + + ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, + &num); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + /* + * Save two copies, one for insert, and one that can + * be changed by ocfs2_map_and_dirty_page() below. + */ + block = phys = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); + + /* + * Non sparse file systems zero on extend, so no need + * to do that now. + */ + if (!ocfs2_sparse_alloc(osb) && + PAGE_CACHE_SIZE < osb->s_clustersize) + end = PAGE_CACHE_SIZE; + + ret = ocfs2_grab_eof_pages(inode, 0, end, pages, &num_pages); + if (ret) { + mlog_errno(ret); + need_free = 1; + goto out_commit; + } + + /* + * This should populate the 1st page for us and mark + * it up to date. + */ + ret = ocfs2_read_inline_data(inode, pages[0], di_bh); + if (ret) { + mlog_errno(ret); + need_free = 1; + goto out_unlock; + } + + page_end = PAGE_CACHE_SIZE; + if (PAGE_CACHE_SIZE > osb->s_clustersize) + page_end = osb->s_clustersize; + + for (i = 0; i < num_pages; i++) + ocfs2_map_and_dirty_page(inode, handle, 0, page_end, + pages[i], i > 0, &phys); + } + + spin_lock(&oi->ip_lock); + oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL; + di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); + spin_unlock(&oi->ip_lock); + + ocfs2_update_inode_fsync_trans(handle, inode, 1); + ocfs2_dinode_new_extent_list(inode, di); + + ocfs2_journal_dirty(handle, di_bh); + + if (has_data) { + /* + * An error at this point should be extremely rare. If + * this proves to be false, we could always re-build + * the in-inode data from our pages. + */ + ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); + ret = ocfs2_insert_extent(handle, &et, 0, block, 1, 0, NULL); + if (ret) { + mlog_errno(ret); + need_free = 1; + goto out_unlock; + } + + inode->i_blocks = ocfs2_inode_sector_count(inode); + } + +out_unlock: + if (pages) + ocfs2_unlock_and_free_pages(pages, num_pages); + +out_commit: + if (ret < 0 && did_quota) + dquot_free_space_nodirty(inode, + ocfs2_clusters_to_bytes(osb->sb, 1)); + + if (need_free) { + if (data_ac->ac_which == OCFS2_AC_USE_LOCAL) + ocfs2_free_local_alloc_bits(osb, handle, data_ac, + bit_off, num); + else + ocfs2_free_clusters(handle, + data_ac->ac_inode, + data_ac->ac_bh, + ocfs2_clusters_to_blocks(osb->sb, bit_off), + num); + } + + ocfs2_commit_trans(osb, handle); + +out: + if (data_ac) + ocfs2_free_alloc_context(data_ac); +free_pages: + kfree(pages); + return ret; +} + +/* + * It is expected, that by the time you call this function, + * inode->i_size and fe->i_size have been adjusted. + * + * WARNING: This will kfree the truncate context + */ +int ocfs2_commit_truncate(struct ocfs2_super *osb, + struct inode *inode, + struct buffer_head *di_bh) +{ + int status = 0, i, flags = 0; + u32 new_highest_cpos, range, trunc_cpos, trunc_len, phys_cpos, coff; + u64 blkno = 0; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + struct ocfs2_path *path = NULL; + struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + struct ocfs2_extent_list *root_el = &(di->id2.i_list); + u64 refcount_loc = le64_to_cpu(di->i_refcount_loc); + struct ocfs2_extent_tree et; + struct ocfs2_cached_dealloc_ctxt dealloc; + struct ocfs2_refcount_tree *ref_tree = NULL; + + ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); + ocfs2_init_dealloc_ctxt(&dealloc); + + new_highest_cpos = ocfs2_clusters_for_bytes(osb->sb, + i_size_read(inode)); + + path = ocfs2_new_path(di_bh, &di->id2.i_list, + ocfs2_journal_access_di); + if (!path) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + ocfs2_extent_map_trunc(inode, new_highest_cpos); + +start: + /* + * Check that we still have allocation to delete. + */ + if (OCFS2_I(inode)->ip_clusters == 0) { + status = 0; + goto bail; + } + + /* + * Truncate always works against the rightmost tree branch. + */ + status = ocfs2_find_path(INODE_CACHE(inode), path, UINT_MAX); + if (status) { + mlog_errno(status); + goto bail; + } + + trace_ocfs2_commit_truncate( + (unsigned long long)OCFS2_I(inode)->ip_blkno, + new_highest_cpos, + OCFS2_I(inode)->ip_clusters, + path->p_tree_depth); + + /* + * By now, el will point to the extent list on the bottom most + * portion of this tree. Only the tail record is considered in + * each pass. + * + * We handle the following cases, in order: + * - empty extent: delete the remaining branch + * - remove the entire record + * - remove a partial record + * - no record needs to be removed (truncate has completed) + */ + el = path_leaf_el(path); + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ocfs2_error(inode->i_sb, + "Inode %llu has empty extent block at %llu\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)path_leaf_bh(path)->b_blocknr); + status = -EROFS; + goto bail; + } + + i = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[i]; + flags = rec->e_flags; + range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); + + if (i == 0 && ocfs2_is_empty_extent(rec)) { + /* + * Lower levels depend on this never happening, but it's best + * to check it up here before changing the tree. + */ + if (root_el->l_tree_depth && rec->e_int_clusters == 0) { + ocfs2_error(inode->i_sb, "Inode %lu has an empty " + "extent record, depth %u\n", inode->i_ino, + le16_to_cpu(root_el->l_tree_depth)); + status = -EROFS; + goto bail; + } + trunc_cpos = le32_to_cpu(rec->e_cpos); + trunc_len = 0; + blkno = 0; + } else if (le32_to_cpu(rec->e_cpos) >= new_highest_cpos) { + /* + * Truncate entire record. + */ + trunc_cpos = le32_to_cpu(rec->e_cpos); + trunc_len = ocfs2_rec_clusters(el, rec); + blkno = le64_to_cpu(rec->e_blkno); + } else if (range > new_highest_cpos) { + /* + * Partial truncate. it also should be + * the last truncate we're doing. + */ + trunc_cpos = new_highest_cpos; + trunc_len = range - new_highest_cpos; + coff = new_highest_cpos - le32_to_cpu(rec->e_cpos); + blkno = le64_to_cpu(rec->e_blkno) + + ocfs2_clusters_to_blocks(inode->i_sb, coff); + } else { + /* + * Truncate completed, leave happily. + */ + status = 0; + goto bail; + } + + phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno); + + if ((flags & OCFS2_EXT_REFCOUNTED) && trunc_len && !ref_tree) { + status = ocfs2_lock_refcount_tree(osb, refcount_loc, 1, + &ref_tree, NULL); + if (status) { + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_remove_btree_range(inode, &et, trunc_cpos, + phys_cpos, trunc_len, flags, &dealloc, + refcount_loc, true); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + ocfs2_reinit_path(path, 1); + + /* + * The check above will catch the case where we've truncated + * away all allocation. + */ + goto start; + +bail: + if (ref_tree) + ocfs2_unlock_refcount_tree(osb, ref_tree, 1); + + ocfs2_schedule_truncate_log_flush(osb, 1); + + ocfs2_run_deallocs(osb, &dealloc); + + ocfs2_free_path(path); + + return status; +} + +/* + * 'start' is inclusive, 'end' is not. + */ +int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh, + unsigned int start, unsigned int end, int trunc) +{ + int ret; + unsigned int numbytes; + handle_t *handle; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + struct ocfs2_inline_data *idata = &di->id2.i_data; + + if (end > i_size_read(inode)) + end = i_size_read(inode); + + BUG_ON(start > end); + + if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) || + !(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL) || + !ocfs2_supports_inline_data(osb)) { + ocfs2_error(inode->i_sb, + "Inline data flags for inode %llu don't agree! " + "Disk: 0x%x, Memory: 0x%x, Superblock: 0x%x\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + le16_to_cpu(di->i_dyn_features), + OCFS2_I(inode)->ip_dyn_features, + osb->s_feature_incompat); + ret = -EROFS; + goto out; + } + + handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out; + } + + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out_commit; + } + + numbytes = end - start; + memset(idata->id_data + start, 0, numbytes); + + /* + * No need to worry about the data page here - it's been + * truncated already and inline data doesn't need it for + * pushing zero's to disk, so we'll let readpage pick it up + * later. + */ + if (trunc) { + i_size_write(inode, start); + di->i_size = cpu_to_le64(start); + } + + inode->i_blocks = ocfs2_inode_sector_count(inode); + inode->i_ctime = inode->i_mtime = CURRENT_TIME; + + di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec); + di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); + + ocfs2_update_inode_fsync_trans(handle, inode, 1); + ocfs2_journal_dirty(handle, di_bh); + +out_commit: + ocfs2_commit_trans(osb, handle); + +out: + return ret; +} + +static int ocfs2_trim_extent(struct super_block *sb, + struct ocfs2_group_desc *gd, + u32 start, u32 count) +{ + u64 discard, bcount; + + bcount = ocfs2_clusters_to_blocks(sb, count); + discard = le64_to_cpu(gd->bg_blkno) + + ocfs2_clusters_to_blocks(sb, start); + + trace_ocfs2_trim_extent(sb, (unsigned long long)discard, bcount); + + return sb_issue_discard(sb, discard, bcount, GFP_NOFS, 0); +} + +static int ocfs2_trim_group(struct super_block *sb, + struct ocfs2_group_desc *gd, + u32 start, u32 max, u32 minbits) +{ + int ret = 0, count = 0, next; + void *bitmap = gd->bg_bitmap; + + if (le16_to_cpu(gd->bg_free_bits_count) < minbits) + return 0; + + trace_ocfs2_trim_group((unsigned long long)le64_to_cpu(gd->bg_blkno), + start, max, minbits); + + while (start < max) { + start = ocfs2_find_next_zero_bit(bitmap, max, start); + if (start >= max) + break; + next = ocfs2_find_next_bit(bitmap, max, start); + + if ((next - start) >= minbits) { + ret = ocfs2_trim_extent(sb, gd, + start, next - start); + if (ret < 0) { + mlog_errno(ret); + break; + } + count += next - start; + } + start = next + 1; + + if (fatal_signal_pending(current)) { + count = -ERESTARTSYS; + break; + } + + if ((le16_to_cpu(gd->bg_free_bits_count) - count) < minbits) + break; + } + + if (ret < 0) + count = ret; + + return count; +} + +int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range) +{ + struct ocfs2_super *osb = OCFS2_SB(sb); + u64 start, len, trimmed, first_group, last_group, group; + int ret, cnt; + u32 first_bit, last_bit, minlen; + struct buffer_head *main_bm_bh = NULL; + struct inode *main_bm_inode = NULL; + struct buffer_head *gd_bh = NULL; + struct ocfs2_dinode *main_bm; + struct ocfs2_group_desc *gd = NULL; + + start = range->start >> osb->s_clustersize_bits; + len = range->len >> osb->s_clustersize_bits; + minlen = range->minlen >> osb->s_clustersize_bits; + + if (minlen >= osb->bitmap_cpg || range->len < sb->s_blocksize) + return -EINVAL; + + main_bm_inode = ocfs2_get_system_file_inode(osb, + GLOBAL_BITMAP_SYSTEM_INODE, + OCFS2_INVALID_SLOT); + if (!main_bm_inode) { + ret = -EIO; + mlog_errno(ret); + goto out; + } + + mutex_lock(&main_bm_inode->i_mutex); + + ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 0); + if (ret < 0) { + mlog_errno(ret); + goto out_mutex; + } + main_bm = (struct ocfs2_dinode *)main_bm_bh->b_data; + + if (start >= le32_to_cpu(main_bm->i_clusters)) { + ret = -EINVAL; + goto out_unlock; + } + + len = range->len >> osb->s_clustersize_bits; + if (start + len > le32_to_cpu(main_bm->i_clusters)) + len = le32_to_cpu(main_bm->i_clusters) - start; + + trace_ocfs2_trim_fs(start, len, minlen); + + /* Determine first and last group to examine based on start and len */ + first_group = ocfs2_which_cluster_group(main_bm_inode, start); + if (first_group == osb->first_cluster_group_blkno) + first_bit = start; + else + first_bit = start - ocfs2_blocks_to_clusters(sb, first_group); + last_group = ocfs2_which_cluster_group(main_bm_inode, start + len - 1); + last_bit = osb->bitmap_cpg; + + trimmed = 0; + for (group = first_group; group <= last_group;) { + if (first_bit + len >= osb->bitmap_cpg) + last_bit = osb->bitmap_cpg; + else + last_bit = first_bit + len; + + ret = ocfs2_read_group_descriptor(main_bm_inode, + main_bm, group, + &gd_bh); + if (ret < 0) { + mlog_errno(ret); + break; + } + + gd = (struct ocfs2_group_desc *)gd_bh->b_data; + cnt = ocfs2_trim_group(sb, gd, first_bit, last_bit, minlen); + brelse(gd_bh); + gd_bh = NULL; + if (cnt < 0) { + ret = cnt; + mlog_errno(ret); + break; + } + + trimmed += cnt; + len -= osb->bitmap_cpg - first_bit; + first_bit = 0; + if (group == osb->first_cluster_group_blkno) + group = ocfs2_clusters_to_blocks(sb, osb->bitmap_cpg); + else + group += ocfs2_clusters_to_blocks(sb, osb->bitmap_cpg); + } + range->len = trimmed * sb->s_blocksize; +out_unlock: + ocfs2_inode_unlock(main_bm_inode, 0); + brelse(main_bm_bh); +out_mutex: + mutex_unlock(&main_bm_inode->i_mutex); + iput(main_bm_inode); +out: + return ret; +} |