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Diffstat (limited to 'fs/ocfs2/ocfs2.h')
| -rw-r--r-- | fs/ocfs2/ocfs2.h | 919 |
1 files changed, 919 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h new file mode 100644 index 000000000..460c6c37e --- /dev/null +++ b/fs/ocfs2/ocfs2.h @@ -0,0 +1,919 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ocfs2.h + * + * Defines macros and structures used in OCFS2 + * + * 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. + */ + +#ifndef OCFS2_H +#define OCFS2_H + +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/list.h> +#include <linux/llist.h> +#include <linux/rbtree.h> +#include <linux/workqueue.h> +#include <linux/kref.h> +#include <linux/mutex.h> +#include <linux/lockdep.h> +#include <linux/jbd2.h> + +/* For union ocfs2_dlm_lksb */ +#include "stackglue.h" + +#include "ocfs2_fs.h" +#include "ocfs2_lockid.h" +#include "ocfs2_ioctl.h" + +/* For struct ocfs2_blockcheck_stats */ +#include "blockcheck.h" + +#include "reservations.h" + +/* Caching of metadata buffers */ + +/* Most user visible OCFS2 inodes will have very few pieces of + * metadata, but larger files (including bitmaps, etc) must be taken + * into account when designing an access scheme. We allow a small + * amount of inlined blocks to be stored on an array and grow the + * structure into a rb tree when necessary. */ +#define OCFS2_CACHE_INFO_MAX_ARRAY 2 + +/* Flags for ocfs2_caching_info */ + +enum ocfs2_caching_info_flags { + /* Indicates that the metadata cache is using the inline array */ + OCFS2_CACHE_FL_INLINE = 1<<1, +}; + +struct ocfs2_caching_operations; +struct ocfs2_caching_info { + /* + * The parent structure provides the locks, but because the + * parent structure can differ, it provides locking operations + * to struct ocfs2_caching_info. + */ + const struct ocfs2_caching_operations *ci_ops; + + /* next two are protected by trans_inc_lock */ + /* which transaction were we created on? Zero if none. */ + unsigned long ci_created_trans; + /* last transaction we were a part of. */ + unsigned long ci_last_trans; + + /* Cache structures */ + unsigned int ci_flags; + unsigned int ci_num_cached; + union { + sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY]; + struct rb_root ci_tree; + } ci_cache; +}; +/* + * Need this prototype here instead of in uptodate.h because journal.h + * uses it. + */ +struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci); + +/* this limits us to 256 nodes + * if we need more, we can do a kmalloc for the map */ +#define OCFS2_NODE_MAP_MAX_NODES 256 +struct ocfs2_node_map { + u16 num_nodes; + unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; +}; + +enum ocfs2_ast_action { + OCFS2_AST_INVALID = 0, + OCFS2_AST_ATTACH, + OCFS2_AST_CONVERT, + OCFS2_AST_DOWNCONVERT, +}; + +/* actions for an unlockast function to take. */ +enum ocfs2_unlock_action { + OCFS2_UNLOCK_INVALID = 0, + OCFS2_UNLOCK_CANCEL_CONVERT, + OCFS2_UNLOCK_DROP_LOCK, +}; + +/* ocfs2_lock_res->l_flags flags. */ +#define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized + * the lvb */ +#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in + * dlm_lock */ +#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to + * downconvert*/ +#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ +#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) +#define OCFS2_LOCK_REFRESHING (0x00000020) +#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization + * for shutdown paths */ +#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track + * when to skip queueing + * a lock because it's + * about to be + * dropped. */ +#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ +#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ +#define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a + call to dlm_lock. Only + exists with BUSY set. */ +#define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread + * from downconverting + * before the upconvert + * has completed */ + +#define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster + * lock has already + * returned, do not block + * dc thread from + * downconverting */ + +struct ocfs2_lock_res_ops; + +typedef void (*ocfs2_lock_callback)(int status, unsigned long data); + +#ifdef CONFIG_OCFS2_FS_STATS +struct ocfs2_lock_stats { + u64 ls_total; /* Total wait in NSEC */ + u32 ls_gets; /* Num acquires */ + u32 ls_fail; /* Num failed acquires */ + + /* Storing max wait in usecs saves 24 bytes per inode */ + u32 ls_max; /* Max wait in USEC */ +}; +#endif + +struct ocfs2_lock_res { + void *l_priv; + struct ocfs2_lock_res_ops *l_ops; + + + struct list_head l_blocked_list; + struct list_head l_mask_waiters; + + unsigned long l_flags; + char l_name[OCFS2_LOCK_ID_MAX_LEN]; + unsigned int l_ro_holders; + unsigned int l_ex_holders; + signed char l_level; + signed char l_requested; + signed char l_blocking; + + /* Data packed - type enum ocfs2_lock_type */ + unsigned char l_type; + + /* used from AST/BAST funcs. */ + /* Data packed - enum type ocfs2_ast_action */ + unsigned char l_action; + /* Data packed - enum type ocfs2_unlock_action */ + unsigned char l_unlock_action; + unsigned int l_pending_gen; + + spinlock_t l_lock; + + struct ocfs2_dlm_lksb l_lksb; + + wait_queue_head_t l_event; + + struct list_head l_debug_list; + +#ifdef CONFIG_OCFS2_FS_STATS + struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */ + u32 l_lock_refresh; /* Disk refreshes */ + struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */ +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map l_lockdep_map; +#endif +}; + +enum ocfs2_orphan_reco_type { + ORPHAN_NO_NEED_TRUNCATE = 0, + ORPHAN_NEED_TRUNCATE, +}; + +enum ocfs2_orphan_scan_state { + ORPHAN_SCAN_ACTIVE, + ORPHAN_SCAN_INACTIVE +}; + +struct ocfs2_orphan_scan { + struct mutex os_lock; + struct ocfs2_super *os_osb; + struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ + struct delayed_work os_orphan_scan_work; + struct timespec os_scantime; /* time this node ran the scan */ + u32 os_count; /* tracks node specific scans */ + u32 os_seqno; /* tracks cluster wide scans */ + atomic_t os_state; /* ACTIVE or INACTIVE */ +}; + +struct ocfs2_dlm_debug { + struct kref d_refcnt; + struct dentry *d_locking_state; + struct list_head d_lockres_tracking; +}; + +enum ocfs2_vol_state +{ + VOLUME_INIT = 0, + VOLUME_MOUNTED, + VOLUME_MOUNTED_QUOTAS, + VOLUME_DISMOUNTED, + VOLUME_DISABLED +}; + +struct ocfs2_alloc_stats +{ + atomic_t moves; + atomic_t local_data; + atomic_t bitmap_data; + atomic_t bg_allocs; + atomic_t bg_extends; +}; + +enum ocfs2_local_alloc_state +{ + OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for + * this mountpoint. */ + OCFS2_LA_ENABLED, /* Local alloc is in use. */ + OCFS2_LA_THROTTLED, /* Local alloc is in use, but number + * of bits has been reduced. */ + OCFS2_LA_DISABLED /* Local alloc has temporarily been + * disabled. */ +}; + +enum ocfs2_mount_options +{ + OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */ + OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ + OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ + OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ + OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ + OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ + OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ + OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ + OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ + OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access + control lists */ + OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ + OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ + OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT + writes */ + OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */ + OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */ + + OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15, /* Journal Async Commit */ +}; + +#define OCFS2_OSB_SOFT_RO 0x0001 +#define OCFS2_OSB_HARD_RO 0x0002 +#define OCFS2_OSB_ERROR_FS 0x0004 +#define OCFS2_DEFAULT_ATIME_QUANTUM 60 + +struct ocfs2_journal; +struct ocfs2_slot_info; +struct ocfs2_recovery_map; +struct ocfs2_replay_map; +struct ocfs2_quota_recovery; +struct ocfs2_super +{ + struct task_struct *commit_task; + struct super_block *sb; + struct inode *root_inode; + struct inode *sys_root_inode; + struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES]; + struct inode **local_system_inodes; + + struct ocfs2_slot_info *slot_info; + + u32 *slot_recovery_generations; + + spinlock_t node_map_lock; + + u64 root_blkno; + u64 system_dir_blkno; + u64 bitmap_blkno; + u32 bitmap_cpg; + u8 *uuid; + char *uuid_str; + u32 uuid_hash; + u8 *vol_label; + u64 first_cluster_group_blkno; + u32 fs_generation; + + u32 s_feature_compat; + u32 s_feature_incompat; + u32 s_feature_ro_compat; + + /* Protects s_next_generation, osb_flags and s_inode_steal_slot. + * Could protect more on osb as it's very short lived. + */ + spinlock_t osb_lock; + u32 s_next_generation; + unsigned long osb_flags; + s16 s_inode_steal_slot; + s16 s_meta_steal_slot; + atomic_t s_num_inodes_stolen; + atomic_t s_num_meta_stolen; + + unsigned long s_mount_opt; + unsigned int s_atime_quantum; + + unsigned int max_slots; + unsigned int node_num; + int slot_num; + int preferred_slot; + int s_sectsize_bits; + int s_clustersize; + int s_clustersize_bits; + unsigned int s_xattr_inline_size; + + atomic_t vol_state; + struct mutex recovery_lock; + struct ocfs2_recovery_map *recovery_map; + struct ocfs2_replay_map *replay_map; + struct task_struct *recovery_thread_task; + int disable_recovery; + wait_queue_head_t checkpoint_event; + struct ocfs2_journal *journal; + unsigned long osb_commit_interval; + + struct delayed_work la_enable_wq; + + /* + * Must hold local alloc i_mutex and osb->osb_lock to change + * local_alloc_bits. Reads can be done under either lock. + */ + unsigned int local_alloc_bits; + unsigned int local_alloc_default_bits; + /* osb_clusters_at_boot can become stale! Do not trust it to + * be up to date. */ + unsigned int osb_clusters_at_boot; + + enum ocfs2_local_alloc_state local_alloc_state; /* protected + * by osb_lock */ + + struct buffer_head *local_alloc_bh; + + u64 la_last_gd; + + struct ocfs2_reservation_map osb_la_resmap; + + unsigned int osb_resv_level; + unsigned int osb_dir_resv_level; + + /* Next three fields are for local node slot recovery during + * mount. */ + int dirty; + struct ocfs2_dinode *local_alloc_copy; + struct ocfs2_quota_recovery *quota_rec; + + struct ocfs2_blockcheck_stats osb_ecc_stats; + struct ocfs2_alloc_stats alloc_stats; + char dev_str[20]; /* "major,minor" of the device */ + + u8 osb_stackflags; + + char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; + char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1]; + struct ocfs2_cluster_connection *cconn; + struct ocfs2_lock_res osb_super_lockres; + struct ocfs2_lock_res osb_rename_lockres; + struct ocfs2_lock_res osb_nfs_sync_lockres; + struct ocfs2_dlm_debug *osb_dlm_debug; + + struct dentry *osb_debug_root; + struct dentry *osb_ctxt; + + wait_queue_head_t recovery_event; + + spinlock_t dc_task_lock; + struct task_struct *dc_task; + wait_queue_head_t dc_event; + unsigned long dc_wake_sequence; + unsigned long dc_work_sequence; + + /* + * Any thread can add locks to the list, but the downconvert + * thread is the only one allowed to remove locks. Any change + * to this rule requires updating + * ocfs2_downconvert_thread_do_work(). + */ + struct list_head blocked_lock_list; + unsigned long blocked_lock_count; + + /* List of dquot structures to drop last reference to */ + struct llist_head dquot_drop_list; + struct work_struct dquot_drop_work; + + wait_queue_head_t osb_mount_event; + + /* Truncate log info */ + struct inode *osb_tl_inode; + struct buffer_head *osb_tl_bh; + struct delayed_work osb_truncate_log_wq; + atomic_t osb_tl_disable; + /* + * How many clusters in our truncate log. + * It must be protected by osb_tl_inode->i_mutex. + */ + unsigned int truncated_clusters; + + struct ocfs2_node_map osb_recovering_orphan_dirs; + unsigned int *osb_orphan_wipes; + wait_queue_head_t osb_wipe_event; + + struct ocfs2_orphan_scan osb_orphan_scan; + + /* used to protect metaecc calculation check of xattr. */ + spinlock_t osb_xattr_lock; + + unsigned int osb_dx_mask; + u32 osb_dx_seed[4]; + + /* the group we used to allocate inodes. */ + u64 osb_inode_alloc_group; + + /* rb tree root for refcount lock. */ + struct rb_root osb_rf_lock_tree; + struct ocfs2_refcount_tree *osb_ref_tree_lru; + + struct mutex system_file_mutex; +}; + +#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) + +/* Useful typedef for passing around journal access functions */ +typedef int (*ocfs2_journal_access_func)(handle_t *handle, + struct ocfs2_caching_info *ci, + struct buffer_head *bh, int type); + +static inline int ocfs2_should_order_data(struct inode *inode) +{ + if (!S_ISREG(inode->i_mode)) + return 0; + if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) + return 0; + return 1; +} + +static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) + return 1; + return 0; +} + +static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) +{ + /* + * Support for sparse files is a pre-requisite + */ + if (!ocfs2_sparse_alloc(osb)) + return 0; + + if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) + return 1; + return 0; +} + +static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO) + return 1; + return 0; +} + + +static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) + return 1; + return 0; +} + +static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) + return 1; + return 0; +} + +static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) + return 1; + return 0; +} + +static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) + return 1; + return 0; +} + +static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) + return 1; + return 0; +} + +static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) +{ + if (ocfs2_supports_indexed_dirs(osb)) + return OCFS2_DX_LINK_MAX; + return OCFS2_LINK_MAX; +} + +static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) +{ + u32 nlink = le16_to_cpu(di->i_links_count); + u32 hi = le16_to_cpu(di->i_links_count_hi); + + if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) + nlink |= (hi << OCFS2_LINKS_HI_SHIFT); + + return nlink; +} + +static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) +{ + u16 lo, hi; + + lo = nlink; + hi = nlink >> OCFS2_LINKS_HI_SHIFT; + + di->i_links_count = cpu_to_le16(lo); + di->i_links_count_hi = cpu_to_le16(hi); +} + +static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) +{ + u32 links = ocfs2_read_links_count(di); + + links += n; + + ocfs2_set_links_count(di, links); +} + +static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) +{ + if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) + return 1; + return 0; +} + +/* set / clear functions because cluster events can make these happen + * in parallel so we want the transitions to be atomic. this also + * means that any future flags osb_flags must be protected by spinlock + * too! */ +static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, + unsigned long flag) +{ + spin_lock(&osb->osb_lock); + osb->osb_flags |= flag; + spin_unlock(&osb->osb_lock); +} + +static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, + int hard) +{ + spin_lock(&osb->osb_lock); + osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); + if (hard) + osb->osb_flags |= OCFS2_OSB_HARD_RO; + else + osb->osb_flags |= OCFS2_OSB_SOFT_RO; + spin_unlock(&osb->osb_lock); +} + +static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) +{ + int ret; + + spin_lock(&osb->osb_lock); + ret = osb->osb_flags & OCFS2_OSB_HARD_RO; + spin_unlock(&osb->osb_lock); + + return ret; +} + +static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) +{ + int ret; + + spin_lock(&osb->osb_lock); + ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; + spin_unlock(&osb->osb_lock); + + return ret; +} + +static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) +{ + return (osb->s_feature_incompat & + (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | + OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); +} + +static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) +{ + if (ocfs2_clusterinfo_valid(osb) && + memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, + OCFS2_STACK_LABEL_LEN)) + return 1; + return 0; +} + +static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb) +{ + if (ocfs2_clusterinfo_valid(osb) && + !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, + OCFS2_STACK_LABEL_LEN)) + return 1; + return 0; +} + +static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) +{ + return ocfs2_o2cb_stack(osb) && + (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); +} + +static inline int ocfs2_mount_local(struct ocfs2_super *osb) +{ + return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); +} + +static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) +{ + return (osb->s_feature_incompat & + OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); +} + + +#define OCFS2_IS_VALID_DINODE(ptr) \ + (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) + +#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ + (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) + +#define OCFS2_IS_VALID_GROUP_DESC(ptr) \ + (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) + + +#define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ + (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) + +#define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ + (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) + +#define OCFS2_IS_VALID_DX_ROOT(ptr) \ + (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) + +#define OCFS2_IS_VALID_DX_LEAF(ptr) \ + (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) + +#define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ + (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) + +static inline unsigned long ino_from_blkno(struct super_block *sb, + u64 blkno) +{ + return (unsigned long)(blkno & (u64)ULONG_MAX); +} + +static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, + u32 clusters) +{ + int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - + sb->s_blocksize_bits; + + return (u64)clusters << c_to_b_bits; +} + +static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, + u64 blocks) +{ + int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - + sb->s_blocksize_bits; + + return (u32)(blocks >> b_to_c_bits); +} + +static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, + u64 bytes) +{ + int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int clusters; + + bytes += OCFS2_SB(sb)->s_clustersize - 1; + /* OCFS2 just cannot have enough clusters to overflow this */ + clusters = (unsigned int)(bytes >> cl_bits); + + return clusters; +} + +static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb, + u64 bytes) +{ + int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int clusters; + + clusters = (unsigned int)(bytes >> cl_bits); + return clusters; +} + +static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, + u64 bytes) +{ + bytes += sb->s_blocksize - 1; + return bytes >> sb->s_blocksize_bits; +} + +static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, + u32 clusters) +{ + return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; +} + +static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, + u64 blocks) +{ + int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; + unsigned int clusters; + + clusters = ocfs2_blocks_to_clusters(sb, blocks); + return (u64)clusters << bits; +} + +static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, + u64 bytes) +{ + int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int clusters; + + clusters = ocfs2_clusters_for_bytes(sb, bytes); + return (u64)clusters << cl_bits; +} + +static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, + u64 bytes) +{ + u64 blocks; + + blocks = ocfs2_blocks_for_bytes(sb, bytes); + return blocks << sb->s_blocksize_bits; +} + +static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) +{ + return (unsigned long)((bytes + 511) >> 9); +} + +static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, + unsigned long pg_index) +{ + u32 clusters = pg_index; + unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; + + if (unlikely(PAGE_CACHE_SHIFT > cbits)) + clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); + else if (PAGE_CACHE_SHIFT < cbits) + clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); + + return clusters; +} + +/* + * Find the 1st page index which covers the given clusters. + */ +static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, + u32 clusters) +{ + unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; + pgoff_t index = clusters; + + if (PAGE_CACHE_SHIFT > cbits) { + index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); + } else if (PAGE_CACHE_SHIFT < cbits) { + index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); + } + + return index; +} + +static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) +{ + unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; + unsigned int pages_per_cluster = 1; + + if (PAGE_CACHE_SHIFT < cbits) + pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); + + return pages_per_cluster; +} + +static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, + unsigned int megs) +{ + BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); + + return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); +} + +static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, + unsigned int clusters) +{ + return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); +} + +static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) +{ + __set_bit_le(bit, bitmap); +} +#define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) + +static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) +{ + __clear_bit_le(bit, bitmap); +} +#define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) + +#define ocfs2_test_bit test_bit_le +#define ocfs2_find_next_zero_bit find_next_zero_bit_le +#define ocfs2_find_next_bit find_next_bit_le + +static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr) +{ +#if BITS_PER_LONG == 64 + *bit += ((unsigned long) addr & 7UL) << 3; + addr = (void *) ((unsigned long) addr & ~7UL); +#elif BITS_PER_LONG == 32 + *bit += ((unsigned long) addr & 3UL) << 3; + addr = (void *) ((unsigned long) addr & ~3UL); +#else +#error "how many bits you are?!" +#endif + return addr; +} + +static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap) +{ + bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); + ocfs2_set_bit(bit, bitmap); +} + +static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap) +{ + bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); + ocfs2_clear_bit(bit, bitmap); +} + +static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap) +{ + bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); + return ocfs2_test_bit(bit, bitmap); +} + +static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max, + int start) +{ + int fix = 0, ret, tmpmax; + bitmap = correct_addr_and_bit_unaligned(&fix, bitmap); + tmpmax = max + fix; + start += fix; + + ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix; + if (ret > max) + return max; + return ret; +} + +#endif /* OCFS2_H */ + |