ext2: Silence lockdep warning about reclaim under xattr_sem

Lockdep complains about a chain:
  sb_internal#2 --> &ei->xattr_sem#2 --> fs_reclaim

and shrink_dentry_list -> ext2_evict_inode -> ext2_xattr_delete_inode ->
down_write(ei->xattr_sem) creating a locking cycle in the reclaim path.
This is however a false positive because when we are in
ext2_evict_inode() we are the only holder of the inode reference and
nobody else should touch xattr_sem of that inode. So we cannot ever
block on acquiring the xattr_sem in the reclaim path.

Silence the lockdep warning by using down_write_trylock() in
ext2_xattr_delete_inode() to not create false locking dependency.

Reported-by: "J. R. Okajima" <hooanon05g@gmail.com>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2020-02-24 12:52:17 +01:00
parent f8788d86ab
commit bc36dfffd5

View File

@ -790,7 +790,15 @@ ext2_xattr_delete_inode(struct inode *inode)
struct buffer_head *bh = NULL;
struct ext2_sb_info *sbi = EXT2_SB(inode->i_sb);
down_write(&EXT2_I(inode)->xattr_sem);
/*
* We are the only ones holding inode reference. The xattr_sem should
* better be unlocked! We could as well just not acquire xattr_sem at
* all but this makes the code more futureproof. OTOH we need trylock
* here to avoid false-positive warning from lockdep about reclaim
* circular dependency.
*/
if (WARN_ON_ONCE(!down_write_trylock(&EXT2_I(inode)->xattr_sem)))
return;
if (!EXT2_I(inode)->i_file_acl)
goto cleanup;