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quota: fix infinite loop

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If we fail to start a transaction when releasing dquot, we have to call
dquot_release() anyway to mark dquot structure as inactive.  Otherwise we
end in an infinite loop inside dqput().

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: xb <xavier.bru@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara
2007-09-11 15:23:29 -07:00
committed by Linus Torvalds
parent af7b83f932
commit 9c3013e9b9
3 changed files with 31 additions and 4 deletions
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11
fs/ext4/super.c
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@@ -2698,8 +2698,11 @@ static int ext4_release_dquot(struct dquot *dquot)
handle = ext4_journal_start(dquot_to_inode(dquot),
EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
if (IS_ERR(handle))
if (IS_ERR(handle)) {
/* Release dquot anyway to avoid endless cycle in dqput() */
dquot_release(dquot);
return PTR_ERR(handle);
}
ret = dquot_release(dquot);
err = ext4_journal_stop(handle);
if (!ret)
@@ -2832,6 +2835,12 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
struct buffer_head *bh;
handle_t *handle = journal_current_handle();
if (!handle) {
printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
" cancelled because transaction is not started.\n",
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
while (towrite > 0) {
tocopy = sb->s_blocksize - offset < towrite ?