diff options
| author | Filipe Manana <fdmanana@suse.com> | 2018-02-06 20:39:20 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:52:09 +0200 |
| commit | 9925eea3225eae9f86cec251e73715ca484bd614 (patch) | |
| tree | 34a859f8cf9bd32ad9b30fada93478ea388b55ec /fs/btrfs/send.c | |
| parent | b114296692b08e196f5bd900d1158487c1a34983 (diff) | |
Btrfs: send, fix issuing write op when processing hole in no data mode
[ Upstream commit d4dfc0f4d39475ccbbac947880b5464a74c30b99 ]
When doing an incremental send of a filesystem with the no-holes feature
enabled, we end up issuing a write operation when using the no data mode
send flag, instead of issuing an update extent operation. Fix this by
issuing the update extent operation instead.
Trivial reproducer:
$ mkfs.btrfs -f -O no-holes /dev/sdc
$ mkfs.btrfs -f /dev/sdd
$ mount /dev/sdc /mnt/sdc
$ mount /dev/sdd /mnt/sdd
$ xfs_io -f -c "pwrite -S 0xab 0 32K" /mnt/sdc/foobar
$ btrfs subvolume snapshot -r /mnt/sdc /mnt/sdc/snap1
$ xfs_io -c "fpunch 8K 8K" /mnt/sdc/foobar
$ btrfs subvolume snapshot -r /mnt/sdc /mnt/sdc/snap2
$ btrfs send /mnt/sdc/snap1 | btrfs receive /mnt/sdd
$ btrfs send --no-data -p /mnt/sdc/snap1 /mnt/sdc/snap2 \
| btrfs receive -vv /mnt/sdd
Before this change the output of the second receive command is:
receiving snapshot snap2 uuid=f6922049-8c22-e544-9ff9-fc6755918447...
utimes
write foobar, offset 8192, len 8192
utimes foobar
BTRFS_IOC_SET_RECEIVED_SUBVOL uuid=f6922049-8c22-e544-9ff9-...
After this change it is:
receiving snapshot snap2 uuid=564d36a3-ebc8-7343-aec9-bf6fda278e64...
utimes
update_extent foobar: offset=8192, len=8192
utimes foobar
BTRFS_IOC_SET_RECEIVED_SUBVOL uuid=564d36a3-ebc8-7343-aec9-bf6fda278e64...
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs/send.c')
| -rw-r--r-- | fs/btrfs/send.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 2c35717a3470..baf5a4cd7ffc 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -5008,6 +5008,9 @@ static int send_hole(struct send_ctx *sctx, u64 end) u64 len; int ret = 0; + if (sctx->flags & BTRFS_SEND_FLAG_NO_FILE_DATA) + return send_update_extent(sctx, offset, end - offset); + p = fs_path_alloc(); if (!p) return -ENOMEM; |