Patch "btrfs: Fix quota reservation leak on preallocated files" has been added to the 4.14-stable tree

Patch "btrfs: Fix quota reservation leak on preallocated files" has been added to the 4.14-stable tree

[gregkh]

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

    btrfs: Fix quota reservation leak on preallocated files

to the 4.14-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:
     btrfs-fix-quota-reservation-leak-on-preallocated-files.patch
and it can be found in the queue-4.14 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 foo@baz Fri Feb 23 11:45:09 CET 2018
From: Justin Maggard <jmaggard10@gmail.com>
Date: Mon, 30 Oct 2017 15:29:10 -0700
Subject: btrfs: Fix quota reservation leak on preallocated files

From: Justin Maggard <jmaggard10@gmail.com>


[ Upstream commit b430b7751286b3acff2d324553c8cec4f1e87764 ]

Commit c6887cd11149 ("Btrfs: don't do nocow check unless we have to")
changed the behavior of __btrfs_buffered_write() so that it first tries
to get a data space reservation, and then skips the relatively expensive
nocow check if the reservation succeeded.

If we have quotas enabled, the data space reservation also includes a
quota reservation.  But in the rewrite case, the space has already been
accounted for in qgroups.  So btrfs_check_data_free_space() increases
the quota reservation, but it never gets decreased when the data
actually gets written and overwrites the pre-existing data.  So we're
left with both the qgroup and qgroup reservation accounting for the same
space.

This commit adds the missing btrfs_qgroup_free_data() call in the case
of BTRFS_ORDERED_PREALLOC extents.

Fixes: c6887cd11149 ("Btrfs: don't do nocow check unless we have to")
Signed-off-by: Justin Maggard <jmaggard@netgear.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/btrfs/inode.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3016,6 +3016,8 @@ static int btrfs_finish_ordered_io(struc
 		compress_type = ordered_extent->compress_type;
 	if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
 		BUG_ON(compress_type);
+		btrfs_qgroup_free_data(inode, NULL, ordered_extent->file_offset,
+				       ordered_extent->len);
 		ret = btrfs_mark_extent_written(trans, BTRFS_I(inode),
 						ordered_extent->file_offset,
 						ordered_extent->file_offset +


Patches currently in stable-queue which might be from jmaggard10@gmail.com are

queue-4.14/btrfs-fix-quota-reservation-leak-on-preallocated-files.patch