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ext4: add lockdep annotations for i_data_sem for ea_inode's

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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>
This commit is contained in:
Theodore Ts'o 2023-05-23 23:49:51 -04:00
parent 2bc7e7c1a3
commit aff3bea953
2 changed files with 6 additions and 0 deletions
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2
fs/ext4/ext4.h
View File

@ -918,11 +918,13 @@ do { \
* where the second inode has larger inode number
* than the first
* I_DATA_SEM_QUOTA - Used for quota inodes only
* I_DATA_SEM_EA - Used for ea_inodes only
*/
enum {
I_DATA_SEM_NORMAL = 0,
I_DATA_SEM_OTHER,
I_DATA_SEM_QUOTA,
I_DATA_SEM_EA
};

4
fs/ext4/xattr.c
View File

@ -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