![Joel Becker](/assets/img/avatar_default.png)
This is the code that computes crc32 and ecc for ocfs2 metadata blocks. There are high-level functions that check whether the filesystem has the ecc feature, mid-level functions that work on a single block or array of buffer_heads, and the low-level ecc hamming code that can handle multiple buffers like crc32_le(). It's not hooked up to the filesystem yet. Signed-off-by: Joel Becker <joel.becker@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
628 lines
16 KiB
C
628 lines
16 KiB
C
/* -*- 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"
|
|
|
|
/* 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_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_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 *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 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;
|
|
|
|
#ifdef CONFIG_OCFS2_FS_STATS
|
|
struct dentry *local_alloc_debug;
|
|
char *local_alloc_debug_buf;
|
|
#endif
|
|
|
|
/* 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_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_dlm_debug *osb_dlm_debug;
|
|
|
|
struct dentry *osb_debug_root;
|
|
|
|
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;
|
|
|
|
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;
|
|
};
|
|
|
|
#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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))
|
|
|
|
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_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 */
|
|
|