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fs: introduce bgl_lock_ptr()

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As suggested by Andreas Dilger, introduce a bgl_lock_ptr() helper in
<linux/blockgroup_lock.h> and add separate sb_bgl_lock() helpers to
filesystem specific header files to break the hidden dependency to
struct ext[234]_sb_info.

Also, while at it, convert the macros to static inlines to try make up
for all the times I broke Andrew Morton's tree.

Acked-by: Andreas Dilger <adilger@sun.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pekka Enberg 2009-01-04 12:00:48 -08:00 committed by Linus Torvalds
parent 0a30c5cefa
commit c644f0e4b5
4 changed files with 23 additions and 2 deletions
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6
fs/ext4/ext4_sb.h
View File

@ -146,4 +146,10 @@ struct ext4_sb_info {
struct flex_groups *s_flex_groups;
};
static inline spinlock_t *
sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group)
{
return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group);
}
#endif /* _EXT4_SB */

7
include/linux/blockgroup_lock.h
View File

@ -53,7 +53,10 @@ static inline void bgl_lock_init(struct blockgroup_lock *bgl)
* The accessor is a macro so we can embed a blockgroup_lock into different
* superblock types
*/
#define sb_bgl_lock(sb, block_group) \
(&(sb)->s_blockgroup_lock.locks[(block_group) & (NR_BG_LOCKS-1)].lock)
static inline spinlock_t *
bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
{
return &bgl->locks[(block_group) & (NR_BG_LOCKS-1)].lock;
}
#endif

6
include/linux/ext2_fs_sb.h
View File

@ -108,4 +108,10 @@ struct ext2_sb_info {
struct ext2_reserve_window_node s_rsv_window_head;
};
static inline spinlock_t *
sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
{
return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group);
}
#endif /* _LINUX_EXT2_FS_SB */

6
include/linux/ext3_fs_sb.h
View File

@ -83,4 +83,10 @@ struct ext3_sb_info {
#endif
};
static inline spinlock_t *
sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
{
return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group);
}
#endif /* _LINUX_EXT3_FS_SB */