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| author | Yunlei He <heyunlei@huawei.com> | 2017-09-07 05:40:54 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-09-08 06:57:20 +0300 |
| commit | 27161f13e3c3241944846ac24942a85cceda0a2c (patch) | |
| tree | bdd36b6171f9d48fd4a3c68c6f091697bb4cfaba /fs/f2fs/super.c | |
| parent | 13ba41e346170e594b7ce582561b3efa5b85f18f (diff) | |
| download | linux-27161f13e3c3241944846ac24942a85cceda0a2c.tar.xz | |
f2fs: avoid race in between read xattr & write xattr
Thread A: Thread B:
-f2fs_getxattr
-lookup_all_xattrs
-xnid = F2FS_I(inode)->i_xattr_nid;
-f2fs_setxattr
-__f2fs_setxattr
-write_all_xattrs
-truncate_xattr_node
... ...
-write_checkpoint
... ...
-alloc_nid <- nid reuse
-get_node_page
-f2fs_bug_on <- nid != node_footer->nid
It's need a rw_sem to avoid the race
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/super.c')
| -rw-r--r-- | fs/f2fs/super.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 7730316c19c6..89f61eb3d167 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -630,6 +630,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb) init_rwsem(&fi->dio_rwsem[READ]); init_rwsem(&fi->dio_rwsem[WRITE]); init_rwsem(&fi->i_mmap_sem); + init_rwsem(&fi->i_xattr_sem); #ifdef CONFIG_QUOTA memset(&fi->i_dquot, 0, sizeof(fi->i_dquot)); |