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| author | Theodore Ts'o <tytso@mit.edu> | 2023-05-23 23:49:51 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-05-30 15:33:57 -0400 |
| commit | aff3bea95388299eec63440389b4545c8041b357 (patch) | |
| tree | 669708b2e170f2e9097040fcf334c17c5b6bc010 /fs/ext4/xattr.c | |
| parent | 2bc7e7c1a3bc9bd0cbf0f71006f6fe7ef24a00c2 (diff) | |
| download | lwn-aff3bea95388299eec63440389b4545c8041b357.tar.gz lwn-aff3bea95388299eec63440389b4545c8041b357.zip | |
ext4: add lockdep annotations for i_data_sem for ea_inode's
Treat i_data_sem for ea_inodes as being in their own lockdep class to
avoid lockdep complaints about ext4_setattr's use of inode_lock() on
normal inodes potentially causing lock ordering with i_data_sem on
ea_inodes in ext4_xattr_inode_write(). However, ea_inodes will be
operated on by ext4_setattr(), so this isn't a problem.
Cc: stable@kernel.org
Link: https://syzkaller.appspot.com/bug?extid=298c5d8fb4a128bc27b0
Reported-by: syzbot+298c5d8fb4a128bc27b0@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230524034951.779531-5-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index ff7ab63c5b4f..13d7f17a9c8c 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -121,7 +121,11 @@ ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, #ifdef CONFIG_LOCKDEP void ext4_xattr_inode_set_class(struct inode *ea_inode) { + struct ext4_inode_info *ei = EXT4_I(ea_inode); + lockdep_set_subclass(&ea_inode->i_rwsem, 1); + (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ + lockdep_set_subclass(&ei->i_data_sem, I_DATA_SEM_EA); } #endif |