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| author | Justin Maggard <jmaggard10@gmail.com> | 2017-10-31 01:29:10 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-12-07 02:28:12 +0300 |
| commit | b430b7751286b3acff2d324553c8cec4f1e87764 (patch) | |
| tree | ca2af23f06f099dadbf6b58524e9a45e5025496c /fs | |
| parent | ea37d5998b50a72b9045ba60a132eeb20e1c4230 (diff) | |
| download | linux-b430b7751286b3acff2d324553c8cec4f1e87764.tar.xz | |
btrfs: Fix quota reservation leak on preallocated files
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/inode.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 993061f83067..e1a7f3cb5be9 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3005,6 +3005,8 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) 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 + |