The patch below does not apply to the 3.16-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From ad3714b82c631a34724da09a7daa53afcab952fa Mon Sep 17 00:00:00 2001
From: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Mon, 4 Aug 2014 12:59:31 +1000
Subject: [PATCH] xfs: dquot recovery needs verifiers
dquot recovery should add verifiers to the dquot buffers that it
recovers changes into. Unfortunately, it doesn't attached the
verifiers to the buffers in a consistent manner. For example,
xlog_recover_dquot_pass2() reads dquot buffers without a verifier
and then writes it without ever having attached a verifier to the
buffer.
Further, dquot buffer recovery may write a dquot buffer that has not
been modified, or indeed, shoul dbe written because quotas are not
enabled and hence changes to the buffer were not replayed. In this
case, we again write buffers without verifiers attached because that
doesn't happen until after the buffer changes have been replayed.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 8a7d8a79a7be..1fd5787add99 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2399,8 +2399,11 @@ xlog_recover_do_reg_buffer(
* Simple algorithm: if we have found a QUOTAOFF log item of the same type
* (ie. USR or GRP), then just toss this buffer away; don't recover it.
* Else, treat it as a regular buffer and do recovery.
+ *
+ * Return false if the buffer was tossed and true if we recovered the buffer to
+ * indicate to the caller if the buffer needs writing.
*/
-STATIC void
+STATIC bool
xlog_recover_do_dquot_buffer(
struct xfs_mount *mp,
struct xlog *log,
@@ -2415,9 +2418,8 @@ xlog_recover_do_dquot_buffer(
/*
* Filesystems are required to send in quota flags at mount time.
*/
- if (mp->m_qflags == 0) {
- return;
- }
+ if (!mp->m_qflags)
+ return false;
type = 0;
if (buf_f->blf_flags & XFS_BLF_UDQUOT_BUF)
@@ -2430,9 +2432,10 @@ xlog_recover_do_dquot_buffer(
* This type of quotas was turned off, so ignore this buffer
*/
if (log->l_quotaoffs_flag & type)
- return;
+ return false;
xlog_recover_do_reg_buffer(mp, item, bp, buf_f);
+ return true;
}
/*
@@ -2525,14 +2528,18 @@ xlog_recover_buffer_pass2(
if (buf_f->blf_flags & XFS_BLF_INODE_BUF) {
error = xlog_recover_do_inode_buffer(mp, item, bp, buf_f);
+ if (error)
+ goto out_release;
} else if (buf_f->blf_flags &
(XFS_BLF_UDQUOT_BUF|XFS_BLF_PDQUOT_BUF|XFS_BLF_GDQUOT_BUF)) {
- xlog_recover_do_dquot_buffer(mp, log, item, bp, buf_f);
+ bool dirty;
+
+ dirty = xlog_recover_do_dquot_buffer(mp, log, item, bp, buf_f);
+ if (!dirty)
+ goto out_release;
} else {
xlog_recover_do_reg_buffer(mp, item, bp, buf_f);
}
- if (error)
- goto out_release;
/*
* Perform delayed write on the buffer. Asynchronous writes will be
@@ -3022,9 +3029,16 @@ xlog_recover_dquot_pass2(
return -EIO;
ASSERT(dq_f->qlf_len == 1);
+ /*
+ * At this point we are assuming that the dquots have been allocated
+ * and hence the buffer has valid dquots stamped in it. It should,
+ * therefore, pass verifier validation. If the dquot is bad, then the
+ * we'll return an error here, so we don't need to specifically check
+ * the dquot in the buffer after the verifier has run.
+ */
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dq_f->qlf_blkno,
XFS_FSB_TO_BB(mp, dq_f->qlf_len), 0, &bp,
- NULL);
+ &xfs_dquot_buf_ops);
if (error)
return error;
@@ -3032,18 +3046,6 @@ xlog_recover_dquot_pass2(
ddq = (xfs_disk_dquot_t *)xfs_buf_offset(bp, dq_f->qlf_boffset);
/*
- * At least the magic num portion should be on disk because this
- * was among a chunk of dquots created earlier, and we did some
- * minimal initialization then.
- */
- error = xfs_dqcheck(mp, ddq, dq_f->qlf_id, 0, XFS_QMOPT_DOWARN,
- "xlog_recover_dquot_pass2");
- if (error) {
- xfs_buf_relse(bp);
- return -EIO;
- }
-
- /*
* If the dquot has an LSN in it, recover the dquot only if it's less
* than the lsn of the transaction we are replaying.
*/
--
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