Commit a2af23b7 authored Apr 04, 2016 by Chandan Rajendra Committed by David Sterba Apr 28, 2016

Btrfs: __btrfs_buffered_write: Pass valid file offset when releasing delalloc space



The delalloc reserved space is calculated in terms of number of bytes
used by an integral number of blocks. This is done by rounding down the
value of 'pos' to the nearest multiple of sectorsize.

The file offset value held by 'pos' variable may not be aligned to
sectorsize and hence when passing it as an argument to
btrfs_delalloc_release_space(), we may end up releasing larger delalloc
space than we originally had reserved.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 894b36e3

fs/btrfs/file.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1696,7 +1696,9 @@ again:
		btrfs_end_write_no_snapshoting(root);
		btrfs_delalloc_release_metadata(inode, release_bytes);
		} else {
		btrfs_delalloc_release_space(inode, pos, release_bytes);
		btrfs_delalloc_release_space(inode,
		round_down(pos, root->sectorsize),
		release_bytes);
		}
		}

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