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ext4: fix deadlock with quota feature

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We didn't mark hidden quota files with S_NOQUOTA flag and thus quota was
accounted even for quota files. Thus we could recurse back to quota code
when adding new blocks to quota file which can easily deadlock. Mark
hidden quota files properly.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara 2013-04-09 09:21:41 -04:00 committed by Theodore Ts'o
parent e8238f9a83
commit bcb1385096
1 changed files with 2 additions and 0 deletions
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fs/ext4/super.c
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@ -4953,6 +4953,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
return PTR_ERR(qf_inode);
}
/* Don't account quota for quota files to avoid recursion */
qf_inode->i_flags |= S_NOQUOTA;
err = dquot_enable(qf_inode, type, format_id, flags);
iput(qf_inode);