On Mon, May 05, 2014 at 11:10:54PM -0700, David Brown wrote:
On Mon, Feb 24, 2014 at 10:36:52PM -0800, Marc MERLIN wrote:
I got this during a btrfs send:
BTRFS error (device dm-2): did not find backref in send_root. inode=22672,
offset=524288, disk_byte=1490517954560 found extent=1490517954560
I'll try a scrub when I've finished my backup, but is there anything I
can run on the file I've found from the inode?
gargamel:/mnt/dshelf1/Sound# btrfs inspect-internal inode-resolve -v 22672
file.mp3
ioctl ret=0, bytes_left=3998, bytes_missing=0, cnt=1, missed=0
file.mp3
I've just seen this error:
BTRFS error (device sda4): did not find backref in send_root. inode=411890,
offset=307200, disk_byte=48100618240 found extent=48100618240
during a send between two snapshots I have.
after moving to 3.14.2. I've seen it on two filesystems now since
moving to 3.14. I have the two readonly snapshots if there is
anything helpful I can figure out from them.
After bisecting it seems to be caused by
commit 7ef81ac86c8a44ab9f4e6e04e1f4c9ea53615b8a
Author: Josef Bacik <jba...@fb.com>
Date: Fri Jan 24 14:05:42 2014 -0500
Btrfs: only process as many file extents as there are refs
The backref walking code will search down to the key it is looking for
and then
proceed to walk _all_ of the extents on the file until it hits the end.
This is
suboptimal with large files, we only need to look for as many extents as
we have
references for that inode. I have a testcase that creates a randomly
written 4
gig file and before this patch it took 6min 30sec to do the initial
send, with
this patch it takes 2min 30sec to do the intial send. Thanks,
Signed-off-by: Josef Bacik <jba...@fb.com>
Signed-off-by: Chris Mason <c...@fb.com>
This appears to be fixed in 3.15-rc5, but I wonder if either the extra
fixes, or a revert of the above should be applied to 3.14 stable?
David
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