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linux_old1/fs/ocfs2/ocfs2.h

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/* -*- 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/rbtree.h>
#include <linux/workqueue.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#ifndef CONFIG_OCFS2_COMPAT_JBD
# include <linux/jbd2.h>
#else
# include <linux/jbd.h>
# include "ocfs2_jbd_compat.h"
#endif
/* For union ocfs2_dlm_lksb */
#include "stackglue.h"
#include "ocfs2_fs.h"
#include "ocfs2_lockid.h"
/* For struct ocfs2_blockcheck_stats */
#include "blockcheck.h"
/* 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_INODE_MAX_CACHE_ARRAY 2
struct ocfs2_caching_info {
unsigned int ci_num_cached;
union {
sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
struct rb_root ci_tree;
} ci_cache;
};
/* 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. */
struct ocfs2_lock_res_ops;
typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
struct ocfs2_lock_res {
void *l_priv;
struct ocfs2_lock_res_ops *l_ops;
spinlock_t l_lock;
struct list_head l_blocked_list;
struct list_head l_mask_waiters;
enum ocfs2_lock_type l_type;
unsigned long l_flags;
char l_name[OCFS2_LOCK_ID_MAX_LEN];
int l_level;
unsigned int l_ro_holders;
unsigned int l_ex_holders;
union ocfs2_dlm_lksb l_lksb;
/* used from AST/BAST funcs. */
enum ocfs2_ast_action l_action;
enum ocfs2_unlock_action l_unlock_action;
int l_requested;
int l_blocking;
unsigned int l_pending_gen;
wait_queue_head_t l_event;
struct list_head l_debug_list;
#ifdef CONFIG_OCFS2_FS_STATS
unsigned long long l_lock_num_prmode; /* PR acquires */
unsigned long long l_lock_num_exmode; /* EX acquires */
unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
unsigned long long l_lock_total_prmode; /* Tot wait for PR */
unsigned long long l_lock_total_exmode; /* Tot wait for EX */
unsigned int l_lock_max_prmode; /* Max wait for PR */
unsigned int l_lock_max_exmode; /* Max wait for EX */
unsigned int l_lock_refresh; /* Disk refreshes */
#endif
};
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 */
};
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, /* Heartbeat started in local mode */
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, /* POSIX access control lists */
OCFS2_MOUNT_USRQUOTA = 1 << 9, /* We support user quotas */
OCFS2_MOUNT_GRPQUOTA = 1 << 10, /* We support group quotas */
};
#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_dentry_lock;
struct ocfs2_super
{
struct task_struct *commit_task;
struct super_block *sb;
struct inode *root_inode;
struct inode *sys_root_inode;
struct inode *system_inodes[NUM_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;
atomic_t s_num_inodes_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;
atomic_t needs_checkpoint;
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;
enum ocfs2_local_alloc_state local_alloc_state; /* protected
* by osb_lock */
struct buffer_head *local_alloc_bh;
u64 la_last_gd;
/* 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 */
char osb_cluster_stack[OCFS2_STACK_LABEL_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 dentry locks to release. Anyone can add locks to
* the list, ocfs2_wq processes the list */
struct ocfs2_dentry_lock *dentry_lock_list;
struct work_struct dentry_lock_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;
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;
};
#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 inode *inode,
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_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 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);
}
/* 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_userspace_stack(struct ocfs2_super *osb)
{
return (osb->s_feature_incompat &
OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
}
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))
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 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 void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
{
spin_lock(&osb->osb_lock);
osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
spin_unlock(&osb->osb_lock);
atomic_set(&osb->s_num_inodes_stolen, 0);
}
static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb,
s16 slot)
{
spin_lock(&osb->osb_lock);
osb->s_inode_steal_slot = slot;
spin_unlock(&osb->osb_lock);
}
static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
{
s16 slot;
spin_lock(&osb->osb_lock);
slot = osb->s_inode_steal_slot;
spin_unlock(&osb->osb_lock);
return slot;
}
#define ocfs2_set_bit ext2_set_bit
#define ocfs2_clear_bit ext2_clear_bit
#define ocfs2_test_bit ext2_test_bit
#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
#define ocfs2_find_next_bit ext2_find_next_bit
#endif /* OCFS2_H */
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