[PATCH AUTOSEL for 4.4 054/101] Btrfs: send, fix file hole not being preserved due to inline extent

Sasha Levin
2018-03-08T05:32:41Z

From: Filipe Manana <fdmanana@suse.com>

[ Upstream commit e1cbfd7bf6dabdac561c75d08357571f44040a45 ]

Normally we don't have inline extents followed by regular extents, but
there's currently at least one harmless case where this happens. For
example, when the page size is 4Kb and compression is enabled:

$ mkfs.btrfs -f /dev/sdb
$ mount -o compress /dev/sdb /mnt
$ xfs_io -f -c "pwrite -S 0xaa 0 4K" -c "fsync" /mnt/foobar
$ xfs_io -c "pwrite -S 0xbb 8K 4K" -c "fsync" /mnt/foobar

In this case we get a compressed inline extent, representing 4Kb of
data, followed by a hole extent and then a regular data extent. The
inline extent was not expanded/converted to a regular extent exactly
because it represents 4Kb of data. This does not cause any apparent
problem (such as the issue solved by commit e1699d2d7bf6
("btrfs: add missing memset while reading compressed inline extents"))
except trigger an unexpected case in the incremental send code path
that makes us issue an operation to write a hole when it's not needed,
resulting in more writes at the receiver and wasting space at the
receiver.

So teach the incremental send code to deal with this particular case.

The issue can be currently triggered by running fstests btrfs/137 with
compression enabled (MOUNT_OPTIONS="-o compress" ./check btrfs/137).

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
fs/btrfs/send.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index c5bbb5300658..19b56873b797 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -5008,13 +5008,19 @@ static int is_extent_unchanged(struct send_ctx *sctx,
while (key.offset < ekey->offset + left_len) {
ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
right_type = btrfs_file_extent_type(eb, ei);
- if (right_type != BTRFS_FILE_EXTENT_REG) {
+ if (right_type != BTRFS_FILE_EXTENT_REG &&
+ right_type != BTRFS_FILE_EXTENT_INLINE) {
ret = 0;
goto out;
}

right_disknr = btrfs_file_extent_disk_bytenr(eb, ei);
- right_len = btrfs_file_extent_num_bytes(eb, ei);
+ if (right_type == BTRFS_FILE_EXTENT_INLINE) {
+ right_len = btrfs_file_extent_inline_len(eb, slot, ei);
+ right_len = PAGE_ALIGN(right_len);
+ } else {
+ right_len = btrfs_file_extent_num_bytes(eb, ei);
+ }
right_offset = btrfs_file_extent_offset(eb, ei);
right_gen = btrfs_file_extent_generation(eb, ei);

@@ -5028,6 +5034,19 @@ static int is_extent_unchanged(struct send_ctx *sctx,
goto out;
}

+ /*
+ * We just wanted to see if when we have an inline extent, what
+ * follows it is a regular extent (wanted to check the above
+ * condition for inline extents too). This should normally not
+ * happen but it's possible for example when we have an inline
+ * compressed extent representing data with a size matching
+ * the page size (currently the same as sector size).
+ */
+ if (right_type == BTRFS_FILE_EXTENT_INLINE) {
+ ret = 0;
+ goto out;
+ }
+
left_offset_fixed = left_offset;
if (key.offset < ekey->offset) {
/* Fix the right offset for 2a and 7. */
--
2.14.1