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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-03-27 02:51:39 +0900 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-04-13 09:53:49 +0900 |
| commit | bcb48891b05b4179edc86298d3dccb2ce90d5413 (patch) | |
| tree | c7cd9e37ca46e4f7241be2faa5f5c6e7625d7520 /fs/nilfs2/bmap.c | |
| parent | c306af23e19d3c94c9229263c39fe487e915e774 (diff) | |
| download | linux-bcb48891b05b4179edc86298d3dccb2ce90d5413.tar.bz2 | |
nilfs2: fix lockdep recursive locking warning on bmap
The bmap semaphore of DAT file can be held while a bmap of other files
is locked. This has caused the following false detection of lockdep
check:
mount.nilfs2/4667 is trying to acquire lock:
(&bmap->b_sem){..--}, at: [<d0c6c4b4>] nilfs_bmap_lookup_at_level+0x1a/0x74 [nilfs2]
but task is already holding lock:
(&bmap->b_sem){..--}, at: [<d0c6c4b4>] nilfs_bmap_lookup_at_level+0x1a/0x74 [nilfs2]
This will fix the false detection by distinguishing semaphores of the
DAT and other files.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/bmap.c')
| -rw-r--r-- | fs/nilfs2/bmap.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c index 24638e059bf3..064279e33bbb 100644 --- a/fs/nilfs2/bmap.c +++ b/fs/nilfs2/bmap.c @@ -688,6 +688,8 @@ static const struct nilfs_bmap_ptr_operations nilfs_bmap_ptr_ops_gc = { .bpop_translate = NULL, }; +static struct lock_class_key nilfs_bmap_dat_lock_key; + /** * nilfs_bmap_read - read a bmap from an inode * @bmap: bmap @@ -715,6 +717,7 @@ int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode) bmap->b_pops = &nilfs_bmap_ptr_ops_p; bmap->b_last_allocated_key = 0; /* XXX: use macro */ bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT; + lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key); break; case NILFS_CPFILE_INO: case NILFS_SUFILE_INO: @@ -772,6 +775,7 @@ void nilfs_bmap_init_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap) { memcpy(gcbmap, bmap, sizeof(union nilfs_bmap_union)); init_rwsem(&gcbmap->b_sem); + lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key); gcbmap->b_inode = &NILFS_BMAP_I(gcbmap)->vfs_inode; } @@ -779,5 +783,6 @@ void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap) { memcpy(bmap, gcbmap, sizeof(union nilfs_bmap_union)); init_rwsem(&bmap->b_sem); + lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key); bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; } |