Patch "xfs: try any AG when allocating the first btree block when reflinking" has been added to the 4.10-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    xfs: try any AG when allocating the first btree block when reflinking

to the 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xfs-try-any-ag-when-allocating-the-first-btree-block-when-reflinking.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 2fcc319d2467a5f5b78f35f79fd6e22741a31b1e Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 8 Mar 2017 10:38:53 -0800
Subject: xfs: try any AG when allocating the first btree block when reflinking

From: Christoph Hellwig <hch@lst.de>

commit 2fcc319d2467a5f5b78f35f79fd6e22741a31b1e upstream.

When a reflink operation causes the bmap code to allocate a btree block
we're currently doing single-AG allocations due to having ->firstblock
set and then try any higher AG due a little reflink quirk we've put in
when adding the reflink code.  But given that we do not have a minleft
reservation of any kind in this AG we can still not have any space in
the same or higher AG even if the file system has enough free space.
To fix this use a XFS_ALLOCTYPE_FIRST_AG allocation in this fall back
path instead.

[And yes, we need to redo this properly instead of piling hacks over
 hacks.  I'm working on that, but it's not going to be a small series.
 In the meantime this fixes the customer reported issue]

Also add a warning for failing allocations to make it easier to debug.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/xfs/libxfs/xfs_bmap.c       |   10 +++++++---
 fs/xfs/libxfs/xfs_bmap_btree.c |    6 +++---
 2 files changed, 10 insertions(+), 6 deletions(-)

--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -769,8 +769,8 @@ xfs_bmap_extents_to_btree(
 		args.type = XFS_ALLOCTYPE_START_BNO;
 		args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
 	} else if (dfops->dop_low) {
-try_another_ag:
 		args.type = XFS_ALLOCTYPE_START_BNO;
+try_another_ag:
 		args.fsbno = *firstblock;
 	} else {
 		args.type = XFS_ALLOCTYPE_NEAR_BNO;
@@ -796,13 +796,17 @@ try_another_ag:
 	if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) &&
 	    args.fsbno == NULLFSBLOCK &&
 	    args.type == XFS_ALLOCTYPE_NEAR_BNO) {
-		dfops->dop_low = true;
+		args.type = XFS_ALLOCTYPE_FIRST_AG;
 		goto try_another_ag;
 	}
+	if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
+		xfs_iroot_realloc(ip, -1, whichfork);
+		xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+		return -ENOSPC;
+	}
 	/*
 	 * Allocation can't fail, the space was reserved.
 	 */
-	ASSERT(args.fsbno != NULLFSBLOCK);
 	ASSERT(*firstblock == NULLFSBLOCK ||
 	       args.agno >= XFS_FSB_TO_AGNO(mp, *firstblock));
 	*firstblock = cur->bc_private.b.firstblock = args.fsbno;
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -453,8 +453,8 @@ xfs_bmbt_alloc_block(
 
 	if (args.fsbno == NULLFSBLOCK) {
 		args.fsbno = be64_to_cpu(start->l);
-try_another_ag:
 		args.type = XFS_ALLOCTYPE_START_BNO;
+try_another_ag:
 		/*
 		 * Make sure there is sufficient room left in the AG to
 		 * complete a full tree split for an extent insert.  If
@@ -494,8 +494,8 @@ try_another_ag:
 	if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) &&
 	    args.fsbno == NULLFSBLOCK &&
 	    args.type == XFS_ALLOCTYPE_NEAR_BNO) {
-		cur->bc_private.b.dfops->dop_low = true;
 		args.fsbno = cur->bc_private.b.firstblock;
+		args.type = XFS_ALLOCTYPE_FIRST_AG;
 		goto try_another_ag;
 	}
 
@@ -512,7 +512,7 @@ try_another_ag:
 			goto error0;
 		cur->bc_private.b.dfops->dop_low = true;
 	}
-	if (args.fsbno == NULLFSBLOCK) {
+	if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
 		XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 		*stat = 0;
 		return 0;


Patches currently in stable-queue which might be from hch@lst.de are

queue-4.10/xfs-mark-speculative-prealloc-cow-fork-extents-unwritten.patch
queue-4.10/xfs-fix-toctou-race-when-locking-an-inode-to-access-the-data-map.patch
queue-4.10/xfs-use-iomap-new-flag-for-newly-allocated-delalloc-blocks.patch
queue-4.10/xfs-reject-all-unaligned-direct-writes-to-reflinked-files.patch
queue-4.10/xfs-allow-unwritten-extents-in-the-cow-fork.patch
queue-4.10/xfs-tune-down-agno-asserts-in-the-bmap-code.patch
queue-4.10/xfs-verify-free-block-header-fields.patch
queue-4.10/xfs-check-for-obviously-bad-level-values-in-the-bmbt-root.patch
queue-4.10/xfs-don-t-fail-xfs_extent_busy-allocation.patch
queue-4.10/xfs-sync-eofblocks-scans-under-iolock-are-livelock-prone.patch
queue-4.10/xfs-pull-up-iolock-from-xfs_free_eofblocks.patch
queue-4.10/xfs-fail-_dir_open-when-readahead-fails.patch
queue-4.10/xfs-update-ctime-and-mtime-on-clone-destinatation-inodes.patch
queue-4.10/xfs-use-xfs_icluster_size_fsb-to-calculate-inode-chunk-alignment.patch
queue-4.10/xfs-only-reclaim-unwritten-cow-extents-periodically.patch
queue-4.10/xfs-try-any-ag-when-allocating-the-first-btree-block-when-reflinking.patch
queue-4.10/xfs-fix-and-streamline-error-handling-in-xfs_end_io.patch
queue-4.10/xfs-fix-eofblocks-race-with-file-extending-async-dio-writes.patch