From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/gfs2/ops_fstype.c | 1409 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1409 insertions(+) create mode 100644 fs/gfs2/ops_fstype.c (limited to 'fs/gfs2/ops_fstype.c') diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c new file mode 100644 index 000000000..35b49f44c --- /dev/null +++ b/fs/gfs2/ops_fstype.c @@ -0,0 +1,1409 @@ +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License version 2. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gfs2.h" +#include "incore.h" +#include "bmap.h" +#include "glock.h" +#include "glops.h" +#include "inode.h" +#include "recovery.h" +#include "rgrp.h" +#include "super.h" +#include "sys.h" +#include "util.h" +#include "log.h" +#include "quota.h" +#include "dir.h" +#include "meta_io.h" +#include "trace_gfs2.h" + +#define DO 0 +#define UNDO 1 + +/** + * gfs2_tune_init - Fill a gfs2_tune structure with default values + * @gt: tune + * + */ + +static void gfs2_tune_init(struct gfs2_tune *gt) +{ + spin_lock_init(>->gt_spin); + + gt->gt_quota_warn_period = 10; + gt->gt_quota_scale_num = 1; + gt->gt_quota_scale_den = 1; + gt->gt_new_files_jdata = 0; + gt->gt_max_readahead = 1 << 18; + gt->gt_complain_secs = 10; +} + +static struct gfs2_sbd *init_sbd(struct super_block *sb) +{ + struct gfs2_sbd *sdp; + struct address_space *mapping; + + sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); + if (!sdp) + return NULL; + + sb->s_fs_info = sdp; + sdp->sd_vfs = sb; + sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); + if (!sdp->sd_lkstats) { + kfree(sdp); + return NULL; + } + + set_bit(SDF_NOJOURNALID, &sdp->sd_flags); + gfs2_tune_init(&sdp->sd_tune); + + init_waitqueue_head(&sdp->sd_glock_wait); + atomic_set(&sdp->sd_glock_disposal, 0); + init_completion(&sdp->sd_locking_init); + init_completion(&sdp->sd_wdack); + spin_lock_init(&sdp->sd_statfs_spin); + + spin_lock_init(&sdp->sd_rindex_spin); + sdp->sd_rindex_tree.rb_node = NULL; + + INIT_LIST_HEAD(&sdp->sd_jindex_list); + spin_lock_init(&sdp->sd_jindex_spin); + mutex_init(&sdp->sd_jindex_mutex); + init_completion(&sdp->sd_journal_ready); + + INIT_LIST_HEAD(&sdp->sd_quota_list); + mutex_init(&sdp->sd_quota_mutex); + mutex_init(&sdp->sd_quota_sync_mutex); + init_waitqueue_head(&sdp->sd_quota_wait); + INIT_LIST_HEAD(&sdp->sd_trunc_list); + spin_lock_init(&sdp->sd_trunc_lock); + spin_lock_init(&sdp->sd_bitmap_lock); + + mapping = &sdp->sd_aspace; + + address_space_init_once(mapping); + mapping->a_ops = &gfs2_rgrp_aops; + mapping->host = sb->s_bdev->bd_inode; + mapping->flags = 0; + mapping_set_gfp_mask(mapping, GFP_NOFS); + mapping->private_data = NULL; + mapping->writeback_index = 0; + + spin_lock_init(&sdp->sd_log_lock); + atomic_set(&sdp->sd_log_pinned, 0); + INIT_LIST_HEAD(&sdp->sd_log_le_revoke); + INIT_LIST_HEAD(&sdp->sd_log_le_ordered); + spin_lock_init(&sdp->sd_ordered_lock); + + init_waitqueue_head(&sdp->sd_log_waitq); + init_waitqueue_head(&sdp->sd_logd_waitq); + spin_lock_init(&sdp->sd_ail_lock); + INIT_LIST_HEAD(&sdp->sd_ail1_list); + INIT_LIST_HEAD(&sdp->sd_ail2_list); + + init_rwsem(&sdp->sd_log_flush_lock); + atomic_set(&sdp->sd_log_in_flight, 0); + atomic_set(&sdp->sd_reserving_log, 0); + init_waitqueue_head(&sdp->sd_reserving_log_wait); + init_waitqueue_head(&sdp->sd_log_flush_wait); + atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); + mutex_init(&sdp->sd_freeze_mutex); + + return sdp; +} + + +/** + * gfs2_check_sb - Check superblock + * @sdp: the filesystem + * @sb: The superblock + * @silent: Don't print a message if the check fails + * + * Checks the version code of the FS is one that we understand how to + * read and that the sizes of the various on-disk structures have not + * changed. + */ + +static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) +{ + struct gfs2_sb_host *sb = &sdp->sd_sb; + + if (sb->sb_magic != GFS2_MAGIC || + sb->sb_type != GFS2_METATYPE_SB) { + if (!silent) + pr_warn("not a GFS2 filesystem\n"); + return -EINVAL; + } + + /* If format numbers match exactly, we're done. */ + + if (sb->sb_fs_format == GFS2_FORMAT_FS && + sb->sb_multihost_format == GFS2_FORMAT_MULTI) + return 0; + + fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); + + return -EINVAL; +} + +static void end_bio_io_page(struct bio *bio, int error) +{ + struct page *page = bio->bi_private; + + if (!error) + SetPageUptodate(page); + else + pr_warn("error %d reading superblock\n", error); + unlock_page(page); +} + +static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) +{ + struct gfs2_sb_host *sb = &sdp->sd_sb; + struct super_block *s = sdp->sd_vfs; + const struct gfs2_sb *str = buf; + + sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); + sb->sb_type = be32_to_cpu(str->sb_header.mh_type); + sb->sb_format = be32_to_cpu(str->sb_header.mh_format); + sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); + sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); + sb->sb_bsize = be32_to_cpu(str->sb_bsize); + sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); + sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); + sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); + sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); + sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); + + memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); + memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); + memcpy(s->s_uuid, str->sb_uuid, 16); +} + +/** + * gfs2_read_super - Read the gfs2 super block from disk + * @sdp: The GFS2 super block + * @sector: The location of the super block + * @error: The error code to return + * + * This uses the bio functions to read the super block from disk + * because we want to be 100% sure that we never read cached data. + * A super block is read twice only during each GFS2 mount and is + * never written to by the filesystem. The first time its read no + * locks are held, and the only details which are looked at are those + * relating to the locking protocol. Once locking is up and working, + * the sb is read again under the lock to establish the location of + * the master directory (contains pointers to journals etc) and the + * root directory. + * + * Returns: 0 on success or error + */ + +static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) +{ + struct super_block *sb = sdp->sd_vfs; + struct gfs2_sb *p; + struct page *page; + struct bio *bio; + + page = alloc_page(GFP_NOFS); + if (unlikely(!page)) + return -ENOMEM; + + ClearPageUptodate(page); + ClearPageDirty(page); + lock_page(page); + + bio = bio_alloc(GFP_NOFS, 1); + bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); + bio->bi_bdev = sb->s_bdev; + bio_add_page(bio, page, PAGE_SIZE, 0); + + bio->bi_end_io = end_bio_io_page; + bio->bi_private = page; + submit_bio(READ_SYNC | REQ_META, bio); + wait_on_page_locked(page); + bio_put(bio); + if (!PageUptodate(page)) { + __free_page(page); + return -EIO; + } + p = kmap(page); + gfs2_sb_in(sdp, p); + kunmap(page); + __free_page(page); + return gfs2_check_sb(sdp, silent); +} + +/** + * gfs2_read_sb - Read super block + * @sdp: The GFS2 superblock + * @silent: Don't print message if mount fails + * + */ + +static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) +{ + u32 hash_blocks, ind_blocks, leaf_blocks; + u32 tmp_blocks; + unsigned int x; + int error; + + error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); + if (error) { + if (!silent) + fs_err(sdp, "can't read superblock\n"); + return error; + } + + sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - + GFS2_BASIC_BLOCK_SHIFT; + sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; + sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_dinode)) / sizeof(u64); + sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) / sizeof(u64); + sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); + sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; + sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; + sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); + sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) / + sizeof(struct gfs2_quota_change); + sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) + * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ + + /* Compute maximum reservation required to add a entry to a directory */ + + hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), + sdp->sd_jbsize); + + ind_blocks = 0; + for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { + tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); + ind_blocks += tmp_blocks; + } + + leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; + + sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; + + sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_dinode); + sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; + for (x = 2;; x++) { + u64 space, d; + u32 m; + + space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; + d = space; + m = do_div(d, sdp->sd_inptrs); + + if (d != sdp->sd_heightsize[x - 1] || m) + break; + sdp->sd_heightsize[x] = space; + } + sdp->sd_max_height = x; + sdp->sd_heightsize[x] = ~0; + gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); + + sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_dinode); + sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; + for (x = 2;; x++) { + u64 space, d; + u32 m; + + space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; + d = space; + m = do_div(d, sdp->sd_inptrs); + + if (d != sdp->sd_jheightsize[x - 1] || m) + break; + sdp->sd_jheightsize[x] = space; + } + sdp->sd_max_jheight = x; + sdp->sd_jheightsize[x] = ~0; + gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); + + return 0; +} + +static int init_names(struct gfs2_sbd *sdp, int silent) +{ + char *proto, *table; + int error = 0; + + proto = sdp->sd_args.ar_lockproto; + table = sdp->sd_args.ar_locktable; + + /* Try to autodetect */ + + if (!proto[0] || !table[0]) { + error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); + if (error) + return error; + + if (!proto[0]) + proto = sdp->sd_sb.sb_lockproto; + if (!table[0]) + table = sdp->sd_sb.sb_locktable; + } + + if (!table[0]) + table = sdp->sd_vfs->s_id; + + strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); + strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); + + table = sdp->sd_table_name; + while ((table = strchr(table, '/'))) + *table = '_'; + + return error; +} + +static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, + int undo) +{ + int error = 0; + + if (undo) + goto fail_trans; + + error = gfs2_glock_nq_num(sdp, + GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, + LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, + mount_gh); + if (error) { + fs_err(sdp, "can't acquire mount glock: %d\n", error); + goto fail; + } + + error = gfs2_glock_nq_num(sdp, + GFS2_LIVE_LOCK, &gfs2_nondisk_glops, + LM_ST_SHARED, + LM_FLAG_NOEXP | GL_EXACT, + &sdp->sd_live_gh); + if (error) { + fs_err(sdp, "can't acquire live glock: %d\n", error); + goto fail_mount; + } + + error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, + CREATE, &sdp->sd_rename_gl); + if (error) { + fs_err(sdp, "can't create rename glock: %d\n", error); + goto fail_live; + } + + error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, + CREATE, &sdp->sd_freeze_gl); + if (error) { + fs_err(sdp, "can't create transaction glock: %d\n", error); + goto fail_rename; + } + + return 0; + +fail_trans: + gfs2_glock_put(sdp->sd_freeze_gl); +fail_rename: + gfs2_glock_put(sdp->sd_rename_gl); +fail_live: + gfs2_glock_dq_uninit(&sdp->sd_live_gh); +fail_mount: + gfs2_glock_dq_uninit(mount_gh); +fail: + return error; +} + +static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, + u64 no_addr, const char *name) +{ + struct gfs2_sbd *sdp = sb->s_fs_info; + struct dentry *dentry; + struct inode *inode; + + inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0); + if (IS_ERR(inode)) { + fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); + return PTR_ERR(inode); + } + dentry = d_make_root(inode); + if (!dentry) { + fs_err(sdp, "can't alloc %s dentry\n", name); + return -ENOMEM; + } + *dptr = dentry; + return 0; +} + +static int init_sb(struct gfs2_sbd *sdp, int silent) +{ + struct super_block *sb = sdp->sd_vfs; + struct gfs2_holder sb_gh; + u64 no_addr; + int ret; + + ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, + LM_ST_SHARED, 0, &sb_gh); + if (ret) { + fs_err(sdp, "can't acquire superblock glock: %d\n", ret); + return ret; + } + + ret = gfs2_read_sb(sdp, silent); + if (ret) { + fs_err(sdp, "can't read superblock: %d\n", ret); + goto out; + } + + /* Set up the buffer cache and SB for real */ + if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { + ret = -EINVAL; + fs_err(sdp, "FS block size (%u) is too small for device " + "block size (%u)\n", + sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); + goto out; + } + if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { + ret = -EINVAL; + fs_err(sdp, "FS block size (%u) is too big for machine " + "page size (%u)\n", + sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); + goto out; + } + sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); + + /* Get the root inode */ + no_addr = sdp->sd_sb.sb_root_dir.no_addr; + ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); + if (ret) + goto out; + + /* Get the master inode */ + no_addr = sdp->sd_sb.sb_master_dir.no_addr; + ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); + if (ret) { + dput(sdp->sd_root_dir); + goto out; + } + sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); +out: + gfs2_glock_dq_uninit(&sb_gh); + return ret; +} + +static void gfs2_others_may_mount(struct gfs2_sbd *sdp) +{ + char *message = "FIRSTMOUNT=Done"; + char *envp[] = { message, NULL }; + + fs_info(sdp, "first mount done, others may mount\n"); + + if (sdp->sd_lockstruct.ls_ops->lm_first_done) + sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); + + kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); +} + +/** + * gfs2_jindex_hold - Grab a lock on the jindex + * @sdp: The GFS2 superblock + * @ji_gh: the holder for the jindex glock + * + * Returns: errno + */ + +static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) +{ + struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); + struct qstr name; + char buf[20]; + struct gfs2_jdesc *jd; + int error; + + name.name = buf; + + mutex_lock(&sdp->sd_jindex_mutex); + + for (;;) { + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); + if (error) + break; + + name.len = sprintf(buf, "journal%u", sdp->sd_journals); + name.hash = gfs2_disk_hash(name.name, name.len); + + error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); + if (error == -ENOENT) { + error = 0; + break; + } + + gfs2_glock_dq_uninit(ji_gh); + + if (error) + break; + + error = -ENOMEM; + jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); + if (!jd) + break; + + INIT_LIST_HEAD(&jd->extent_list); + INIT_LIST_HEAD(&jd->jd_revoke_list); + + INIT_WORK(&jd->jd_work, gfs2_recover_func); + jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); + if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { + if (!jd->jd_inode) + error = -ENOENT; + else + error = PTR_ERR(jd->jd_inode); + kfree(jd); + break; + } + + spin_lock(&sdp->sd_jindex_spin); + jd->jd_jid = sdp->sd_journals++; + list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); + spin_unlock(&sdp->sd_jindex_spin); + } + + mutex_unlock(&sdp->sd_jindex_mutex); + + return error; +} + +/** + * check_journal_clean - Make sure a journal is clean for a spectator mount + * @sdp: The GFS2 superblock + * @jd: The journal descriptor + * + * Returns: 0 if the journal is clean or locked, else an error + */ +static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) +{ + int error; + struct gfs2_holder j_gh; + struct gfs2_log_header_host head; + struct gfs2_inode *ip; + + ip = GFS2_I(jd->jd_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | + GL_EXACT | GL_NOCACHE, &j_gh); + if (error) { + fs_err(sdp, "Error locking journal for spectator mount.\n"); + return -EPERM; + } + error = gfs2_jdesc_check(jd); + if (error) { + fs_err(sdp, "Error checking journal for spectator mount.\n"); + goto out_unlock; + } + error = gfs2_find_jhead(jd, &head); + if (error) { + fs_err(sdp, "Error parsing journal for spectator mount.\n"); + goto out_unlock; + } + if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { + error = -EPERM; + fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " + "must not be a spectator.\n", jd->jd_jid); + } + +out_unlock: + gfs2_glock_dq_uninit(&j_gh); + return error; +} + +static int init_journal(struct gfs2_sbd *sdp, int undo) +{ + struct inode *master = d_inode(sdp->sd_master_dir); + struct gfs2_holder ji_gh; + struct gfs2_inode *ip; + int jindex = 1; + int error = 0; + + if (undo) { + jindex = 0; + goto fail_jinode_gh; + } + + sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); + if (IS_ERR(sdp->sd_jindex)) { + fs_err(sdp, "can't lookup journal index: %d\n", error); + return PTR_ERR(sdp->sd_jindex); + } + + /* Load in the journal index special file */ + + error = gfs2_jindex_hold(sdp, &ji_gh); + if (error) { + fs_err(sdp, "can't read journal index: %d\n", error); + goto fail; + } + + error = -EUSERS; + if (!gfs2_jindex_size(sdp)) { + fs_err(sdp, "no journals!\n"); + goto fail_jindex; + } + + if (sdp->sd_args.ar_spectator) { + sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); + atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); + atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); + atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); + } else { + if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { + fs_err(sdp, "can't mount journal #%u\n", + sdp->sd_lockstruct.ls_jid); + fs_err(sdp, "there are only %u journals (0 - %u)\n", + gfs2_jindex_size(sdp), + gfs2_jindex_size(sdp) - 1); + goto fail_jindex; + } + sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); + + error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, + &gfs2_journal_glops, + LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, + &sdp->sd_journal_gh); + if (error) { + fs_err(sdp, "can't acquire journal glock: %d\n", error); + goto fail_jindex; + } + + ip = GFS2_I(sdp->sd_jdesc->jd_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, + LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, + &sdp->sd_jinode_gh); + if (error) { + fs_err(sdp, "can't acquire journal inode glock: %d\n", + error); + goto fail_journal_gh; + } + + error = gfs2_jdesc_check(sdp->sd_jdesc); + if (error) { + fs_err(sdp, "my journal (%u) is bad: %d\n", + sdp->sd_jdesc->jd_jid, error); + goto fail_jinode_gh; + } + atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); + atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); + atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); + + /* Map the extents for this journal's blocks */ + gfs2_map_journal_extents(sdp, sdp->sd_jdesc); + } + trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); + + if (sdp->sd_lockstruct.ls_first) { + unsigned int x; + for (x = 0; x < sdp->sd_journals; x++) { + struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); + + if (sdp->sd_args.ar_spectator) { + error = check_journal_clean(sdp, jd); + if (error) + goto fail_jinode_gh; + continue; + } + error = gfs2_recover_journal(jd, true); + if (error) { + fs_err(sdp, "error recovering journal %u: %d\n", + x, error); + goto fail_jinode_gh; + } + } + + gfs2_others_may_mount(sdp); + } else if (!sdp->sd_args.ar_spectator) { + error = gfs2_recover_journal(sdp->sd_jdesc, true); + if (error) { + fs_err(sdp, "error recovering my journal: %d\n", error); + goto fail_jinode_gh; + } + } + + set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); + gfs2_glock_dq_uninit(&ji_gh); + jindex = 0; + INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); + return 0; + +fail_jinode_gh: + if (!sdp->sd_args.ar_spectator) + gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); +fail_journal_gh: + if (!sdp->sd_args.ar_spectator) + gfs2_glock_dq_uninit(&sdp->sd_journal_gh); +fail_jindex: + gfs2_jindex_free(sdp); + if (jindex) + gfs2_glock_dq_uninit(&ji_gh); +fail: + iput(sdp->sd_jindex); + return error; +} + +static struct lock_class_key gfs2_quota_imutex_key; + +static int init_inodes(struct gfs2_sbd *sdp, int undo) +{ + int error = 0; + struct inode *master = d_inode(sdp->sd_master_dir); + + if (undo) + goto fail_qinode; + + error = init_journal(sdp, undo); + complete_all(&sdp->sd_journal_ready); + if (error) + goto fail; + + /* Read in the master statfs inode */ + sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); + if (IS_ERR(sdp->sd_statfs_inode)) { + error = PTR_ERR(sdp->sd_statfs_inode); + fs_err(sdp, "can't read in statfs inode: %d\n", error); + goto fail_journal; + } + + /* Read in the resource index inode */ + sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); + if (IS_ERR(sdp->sd_rindex)) { + error = PTR_ERR(sdp->sd_rindex); + fs_err(sdp, "can't get resource index inode: %d\n", error); + goto fail_statfs; + } + sdp->sd_rindex_uptodate = 0; + + /* Read in the quota inode */ + sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); + if (IS_ERR(sdp->sd_quota_inode)) { + error = PTR_ERR(sdp->sd_quota_inode); + fs_err(sdp, "can't get quota file inode: %d\n", error); + goto fail_rindex; + } + /* + * i_mutex on quota files is special. Since this inode is hidden system + * file, we are safe to define locking ourselves. + */ + lockdep_set_class(&sdp->sd_quota_inode->i_mutex, + &gfs2_quota_imutex_key); + + error = gfs2_rindex_update(sdp); + if (error) + goto fail_qinode; + + return 0; + +fail_qinode: + iput(sdp->sd_quota_inode); +fail_rindex: + gfs2_clear_rgrpd(sdp); + iput(sdp->sd_rindex); +fail_statfs: + iput(sdp->sd_statfs_inode); +fail_journal: + init_journal(sdp, UNDO); +fail: + return error; +} + +static int init_per_node(struct gfs2_sbd *sdp, int undo) +{ + struct inode *pn = NULL; + char buf[30]; + int error = 0; + struct gfs2_inode *ip; + struct inode *master = d_inode(sdp->sd_master_dir); + + if (sdp->sd_args.ar_spectator) + return 0; + + if (undo) + goto fail_qc_gh; + + pn = gfs2_lookup_simple(master, "per_node"); + if (IS_ERR(pn)) { + error = PTR_ERR(pn); + fs_err(sdp, "can't find per_node directory: %d\n", error); + return error; + } + + sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); + sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); + if (IS_ERR(sdp->sd_sc_inode)) { + error = PTR_ERR(sdp->sd_sc_inode); + fs_err(sdp, "can't find local \"sc\" file: %d\n", error); + goto fail; + } + + sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); + sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); + if (IS_ERR(sdp->sd_qc_inode)) { + error = PTR_ERR(sdp->sd_qc_inode); + fs_err(sdp, "can't find local \"qc\" file: %d\n", error); + goto fail_ut_i; + } + + iput(pn); + pn = NULL; + + ip = GFS2_I(sdp->sd_sc_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, + &sdp->sd_sc_gh); + if (error) { + fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); + goto fail_qc_i; + } + + ip = GFS2_I(sdp->sd_qc_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, + &sdp->sd_qc_gh); + if (error) { + fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); + goto fail_ut_gh; + } + + return 0; + +fail_qc_gh: + gfs2_glock_dq_uninit(&sdp->sd_qc_gh); +fail_ut_gh: + gfs2_glock_dq_uninit(&sdp->sd_sc_gh); +fail_qc_i: + iput(sdp->sd_qc_inode); +fail_ut_i: + iput(sdp->sd_sc_inode); +fail: + if (pn) + iput(pn); + return error; +} + +static const match_table_t nolock_tokens = { + { Opt_jid, "jid=%d\n", }, + { Opt_err, NULL }, +}; + +static const struct lm_lockops nolock_ops = { + .lm_proto_name = "lock_nolock", + .lm_put_lock = gfs2_glock_free, + .lm_tokens = &nolock_tokens, +}; + +/** + * gfs2_lm_mount - mount a locking protocol + * @sdp: the filesystem + * @args: mount arguments + * @silent: if 1, don't complain if the FS isn't a GFS2 fs + * + * Returns: errno + */ + +static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) +{ + const struct lm_lockops *lm; + struct lm_lockstruct *ls = &sdp->sd_lockstruct; + struct gfs2_args *args = &sdp->sd_args; + const char *proto = sdp->sd_proto_name; + const char *table = sdp->sd_table_name; + char *o, *options; + int ret; + + if (!strcmp("lock_nolock", proto)) { + lm = &nolock_ops; + sdp->sd_args.ar_localflocks = 1; +#ifdef CONFIG_GFS2_FS_LOCKING_DLM + } else if (!strcmp("lock_dlm", proto)) { + lm = &gfs2_dlm_ops; +#endif + } else { + pr_info("can't find protocol %s\n", proto); + return -ENOENT; + } + + fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); + + ls->ls_ops = lm; + ls->ls_first = 1; + + for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { + substring_t tmp[MAX_OPT_ARGS]; + int token, option; + + if (!o || !*o) + continue; + + token = match_token(o, *lm->lm_tokens, tmp); + switch (token) { + case Opt_jid: + ret = match_int(&tmp[0], &option); + if (ret || option < 0) + goto hostdata_error; + if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) + ls->ls_jid = option; + break; + case Opt_id: + case Opt_nodir: + /* Obsolete, but left for backward compat purposes */ + break; + case Opt_first: + ret = match_int(&tmp[0], &option); + if (ret || (option != 0 && option != 1)) + goto hostdata_error; + ls->ls_first = option; + break; + case Opt_err: + default: +hostdata_error: + fs_info(sdp, "unknown hostdata (%s)\n", o); + return -EINVAL; + } + } + + if (lm->lm_mount == NULL) { + fs_info(sdp, "Now mounting FS...\n"); + complete_all(&sdp->sd_locking_init); + return 0; + } + ret = lm->lm_mount(sdp, table); + if (ret == 0) + fs_info(sdp, "Joined cluster. Now mounting FS...\n"); + complete_all(&sdp->sd_locking_init); + return ret; +} + +void gfs2_lm_unmount(struct gfs2_sbd *sdp) +{ + const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; + if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && + lm->lm_unmount) + lm->lm_unmount(sdp); +} + +static int wait_on_journal(struct gfs2_sbd *sdp) +{ + if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) + return 0; + + return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) + ? -EINTR : 0; +} + +void gfs2_online_uevent(struct gfs2_sbd *sdp) +{ + struct super_block *sb = sdp->sd_vfs; + char ro[20]; + char spectator[20]; + char *envp[] = { ro, spectator, NULL }; + sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); + sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); + kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); +} + +/** + * fill_super - Read in superblock + * @sb: The VFS superblock + * @data: Mount options + * @silent: Don't complain if it's not a GFS2 filesystem + * + * Returns: errno + */ + +static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) +{ + struct gfs2_sbd *sdp; + struct gfs2_holder mount_gh; + int error; + + sdp = init_sbd(sb); + if (!sdp) { + pr_warn("can't alloc struct gfs2_sbd\n"); + return -ENOMEM; + } + sdp->sd_args = *args; + + if (sdp->sd_args.ar_spectator) { + sb->s_flags |= MS_RDONLY; + set_bit(SDF_RORECOVERY, &sdp->sd_flags); + } + if (sdp->sd_args.ar_posix_acl) + sb->s_flags |= MS_POSIXACL; + if (sdp->sd_args.ar_nobarrier) + set_bit(SDF_NOBARRIERS, &sdp->sd_flags); + + sb->s_flags |= MS_NOSEC; + sb->s_magic = GFS2_MAGIC; + sb->s_op = &gfs2_super_ops; + sb->s_d_op = &gfs2_dops; + sb->s_export_op = &gfs2_export_ops; + sb->s_xattr = gfs2_xattr_handlers; + sb->s_qcop = &gfs2_quotactl_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; + sb->s_time_gran = 1; + sb->s_maxbytes = MAX_LFS_FILESIZE; + + /* Set up the buffer cache and fill in some fake block size values + to allow us to read-in the on-disk superblock. */ + sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); + sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; + sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - + GFS2_BASIC_BLOCK_SHIFT; + sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; + + sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; + sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; + if (sdp->sd_args.ar_statfs_quantum) { + sdp->sd_tune.gt_statfs_slow = 0; + sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; + } else { + sdp->sd_tune.gt_statfs_slow = 1; + sdp->sd_tune.gt_statfs_quantum = 30; + } + + error = init_names(sdp, silent); + if (error) { + /* In this case, we haven't initialized sysfs, so we have to + manually free the sdp. */ + free_percpu(sdp->sd_lkstats); + kfree(sdp); + sb->s_fs_info = NULL; + return error; + } + + snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); + + error = gfs2_sys_fs_add(sdp); + /* + * If we hit an error here, gfs2_sys_fs_add will have called function + * kobject_put which causes the sysfs usage count to go to zero, which + * causes sysfs to call function gfs2_sbd_release, which frees sdp. + * Subsequent error paths here will call gfs2_sys_fs_del, which also + * kobject_put to free sdp. + */ + if (error) + return error; + + gfs2_create_debugfs_file(sdp); + + error = gfs2_lm_mount(sdp, silent); + if (error) + goto fail_debug; + + error = init_locking(sdp, &mount_gh, DO); + if (error) + goto fail_lm; + + error = init_sb(sdp, silent); + if (error) + goto fail_locking; + + error = wait_on_journal(sdp); + if (error) + goto fail_sb; + + /* + * If user space has failed to join the cluster or some similar + * failure has occurred, then the journal id will contain a + * negative (error) number. This will then be returned to the + * caller (of the mount syscall). We do this even for spectator + * mounts (which just write a jid of 0 to indicate "ok" even though + * the jid is unused in the spectator case) + */ + if (sdp->sd_lockstruct.ls_jid < 0) { + error = sdp->sd_lockstruct.ls_jid; + sdp->sd_lockstruct.ls_jid = 0; + goto fail_sb; + } + + if (sdp->sd_args.ar_spectator) + snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", + sdp->sd_table_name); + else + snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", + sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); + + error = init_inodes(sdp, DO); + if (error) + goto fail_sb; + + error = init_per_node(sdp, DO); + if (error) + goto fail_inodes; + + error = gfs2_statfs_init(sdp); + if (error) { + fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); + goto fail_per_node; + } + + if (!(sb->s_flags & MS_RDONLY)) { + error = gfs2_make_fs_rw(sdp); + if (error) { + fs_err(sdp, "can't make FS RW: %d\n", error); + goto fail_per_node; + } + } + + gfs2_glock_dq_uninit(&mount_gh); + gfs2_online_uevent(sdp); + return 0; + +fail_per_node: + init_per_node(sdp, UNDO); +fail_inodes: + init_inodes(sdp, UNDO); +fail_sb: + if (sdp->sd_root_dir) + dput(sdp->sd_root_dir); + if (sdp->sd_master_dir) + dput(sdp->sd_master_dir); + if (sb->s_root) + dput(sb->s_root); + sb->s_root = NULL; +fail_locking: + init_locking(sdp, &mount_gh, UNDO); +fail_lm: + complete_all(&sdp->sd_journal_ready); + gfs2_gl_hash_clear(sdp); + gfs2_lm_unmount(sdp); +fail_debug: + gfs2_delete_debugfs_file(sdp); + free_percpu(sdp->sd_lkstats); + /* gfs2_sys_fs_del must be the last thing we do, since it causes + * sysfs to call function gfs2_sbd_release, which frees sdp. */ + gfs2_sys_fs_del(sdp); + sb->s_fs_info = NULL; + return error; +} + +static int set_gfs2_super(struct super_block *s, void *data) +{ + s->s_bdev = data; + s->s_dev = s->s_bdev->bd_dev; + + /* + * We set the bdi here to the queue backing, file systems can + * overwrite this in ->fill_super() + */ + s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; + return 0; +} + +static int test_gfs2_super(struct super_block *s, void *ptr) +{ + struct block_device *bdev = ptr; + return (bdev == s->s_bdev); +} + +/** + * gfs2_mount - Get the GFS2 superblock + * @fs_type: The GFS2 filesystem type + * @flags: Mount flags + * @dev_name: The name of the device + * @data: The mount arguments + * + * Q. Why not use get_sb_bdev() ? + * A. We need to select one of two root directories to mount, independent + * of whether this is the initial, or subsequent, mount of this sb + * + * Returns: 0 or -ve on error + */ + +static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data) +{ + struct block_device *bdev; + struct super_block *s; + fmode_t mode = FMODE_READ | FMODE_EXCL; + int error; + struct gfs2_args args; + struct gfs2_sbd *sdp; + + if (!(flags & MS_RDONLY)) + mode |= FMODE_WRITE; + + bdev = blkdev_get_by_path(dev_name, mode, fs_type); + if (IS_ERR(bdev)) + return ERR_CAST(bdev); + + /* + * once the super is inserted into the list by sget, s_umount + * will protect the lockfs code from trying to start a snapshot + * while we are mounting + */ + mutex_lock(&bdev->bd_fsfreeze_mutex); + if (bdev->bd_fsfreeze_count > 0) { + mutex_unlock(&bdev->bd_fsfreeze_mutex); + error = -EBUSY; + goto error_bdev; + } + s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); + mutex_unlock(&bdev->bd_fsfreeze_mutex); + error = PTR_ERR(s); + if (IS_ERR(s)) + goto error_bdev; + + if (s->s_root) { + /* + * s_umount nests inside bd_mutex during + * __invalidate_device(). blkdev_put() acquires + * bd_mutex and can't be called under s_umount. Drop + * s_umount temporarily. This is safe as we're + * holding an active reference. + */ + up_write(&s->s_umount); + blkdev_put(bdev, mode); + down_write(&s->s_umount); + } + + memset(&args, 0, sizeof(args)); + args.ar_quota = GFS2_QUOTA_DEFAULT; + args.ar_data = GFS2_DATA_DEFAULT; + args.ar_commit = 30; + args.ar_statfs_quantum = 30; + args.ar_quota_quantum = 60; + args.ar_errors = GFS2_ERRORS_DEFAULT; + + error = gfs2_mount_args(&args, data); + if (error) { + pr_warn("can't parse mount arguments\n"); + goto error_super; + } + + if (s->s_root) { + error = -EBUSY; + if ((flags ^ s->s_flags) & MS_RDONLY) + goto error_super; + } else { + char b[BDEVNAME_SIZE]; + + s->s_mode = mode; + strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); + sb_set_blocksize(s, block_size(bdev)); + error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); + if (error) + goto error_super; + s->s_flags |= MS_ACTIVE; + bdev->bd_super = s; + } + + sdp = s->s_fs_info; + if (args.ar_meta) + return dget(sdp->sd_master_dir); + else + return dget(sdp->sd_root_dir); + +error_super: + deactivate_locked_super(s); + return ERR_PTR(error); +error_bdev: + blkdev_put(bdev, mode); + return ERR_PTR(error); +} + +static int set_meta_super(struct super_block *s, void *ptr) +{ + return -EINVAL; +} + +static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + struct super_block *s; + struct gfs2_sbd *sdp; + struct path path; + int error; + + error = kern_path(dev_name, LOOKUP_FOLLOW, &path); + if (error) { + pr_warn("path_lookup on %s returned error %d\n", + dev_name, error); + return ERR_PTR(error); + } + s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, + d_inode(path.dentry)->i_sb->s_bdev); + path_put(&path); + if (IS_ERR(s)) { + pr_warn("gfs2 mount does not exist\n"); + return ERR_CAST(s); + } + if ((flags ^ s->s_flags) & MS_RDONLY) { + deactivate_locked_super(s); + return ERR_PTR(-EBUSY); + } + sdp = s->s_fs_info; + return dget(sdp->sd_master_dir); +} + +static void gfs2_kill_sb(struct super_block *sb) +{ + struct gfs2_sbd *sdp = sb->s_fs_info; + + if (sdp == NULL) { + kill_block_super(sb); + return; + } + + gfs2_log_flush(sdp, NULL, SYNC_FLUSH); + dput(sdp->sd_root_dir); + dput(sdp->sd_master_dir); + sdp->sd_root_dir = NULL; + sdp->sd_master_dir = NULL; + shrink_dcache_sb(sb); + gfs2_delete_debugfs_file(sdp); + free_percpu(sdp->sd_lkstats); + kill_block_super(sb); +} + +struct file_system_type gfs2_fs_type = { + .name = "gfs2", + .fs_flags = FS_REQUIRES_DEV, + .mount = gfs2_mount, + .kill_sb = gfs2_kill_sb, + .owner = THIS_MODULE, +}; +MODULE_ALIAS_FS("gfs2"); + +struct file_system_type gfs2meta_fs_type = { + .name = "gfs2meta", + .fs_flags = FS_REQUIRES_DEV, + .mount = gfs2_mount_meta, + .owner = THIS_MODULE, +}; +MODULE_ALIAS_FS("gfs2meta"); -- cgit v1.2.3-54-g00ecf