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| author | Yongqiang Yang <xiaoqiangnk@gmail.com> | 2011-07-27 05:35:44 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-07-27 05:35:44 +0400 |
| commit | 8f82f840ec6ab873f520364d443ff6fa1b3f8e22 (patch) | |
| tree | 72d90cdc8f7311ef913b7471e53f718bebbf7414 /fs/ext4/ext4.h | |
| parent | 2d859db3e4a82a365572592d57624a5f996ed0ec (diff) | |
| download | linux-8f82f840ec6ab873f520364d443ff6fa1b3f8e22.tar.xz | |
ext4: prevent parallel resizers by atomic bit ops
Before this patch, parallel resizers are allowed and protected by a
mutex lock, actually, there is no need to support parallel resizer, so
this patch prevents parallel resizers by atmoic bit ops, like
lock_page() and unlock_page() do.
To do this, the patch removed the mutex lock s_resize_lock from struct
ext4_sb_info and added a unsigned long field named s_resize_flags
which inidicates if there is a resizer.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 62cee2b6fe79..bb0f7760c7c8 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1127,7 +1127,8 @@ struct ext4_sb_info { struct journal_s *s_journal; struct list_head s_orphan; struct mutex s_orphan_lock; - struct mutex s_resize_lock; + unsigned long s_resize_flags; /* Flags indicating if there + is a resizer */ unsigned long s_commit_interval; u32 s_max_batch_time; u32 s_min_batch_time; @@ -2269,6 +2270,10 @@ static inline void set_bitmap_uptodate(struct buffer_head *bh) extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; +#define EXT4_RESIZING 0 +extern int ext4_resize_begin(struct super_block *sb); +extern void ext4_resize_end(struct super_block *sb); + #endif /* __KERNEL__ */ #endif /* _EXT4_H */ |