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Bug 1051985 - btrfs-progs: btrfs scrub returns non-zero but reports no errors
Summary: btrfs-progs: btrfs scrub returns non-zero but reports no errors
Keywords:
Status: CLOSED DUPLICATE of bug 1134981
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: btrfs-progs
Version: 7.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: fs-maint
QA Contact: Filesystem QE
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-01-13 03:32 UTC by Eryu Guan
Modified: 2014-10-15 23:18 UTC (History)
2 users (show)

Fixed In Version: btrfs-progs-3.16-1.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-10-15 23:13:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Bug fix for your problem (2.76 KB, patch)
2014-03-22 07:19 UTC, Wang Shilong 		no flags Details | Diff
View All

Description Eryu Guan 2014-01-13 03:32:41 UTC 
Description of problem:
After converting btrfs to raid5 or raid6 profile, btrfs scrub returns non-zero return value, but the output of scrub indicates no errors, dmesg shows no errors either.

Not sure it's a kernel issue or a btrfs-progs issue, take it as btrfs-progs though.

[root@ibm-p750e-02-lp1 profile-conversion]# mkfs -t btrfs -m raid0 -d raid0 -f -K /dev/loop{0..3}

WARNING! - Btrfs v3.12 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

Turning ON incompat feature 'extref': increased hardlink limit per file to 65536
adding device /dev/loop1 id 2
adding device /dev/loop2 id 3
adding device /dev/loop3 id 4
fs created label (null) on /dev/loop0
        nodesize 65536 leafsize 65536 sectorsize 65536 size 4.00GiB
Btrfs v3.12
[root@ibm-p750e-02-lp1 profile-conversion]# mount /dev/loop0 /mnt/btrfs
[root@ibm-p750e-02-lp1 profile-conversion]# btrfs fi balance start -mconvert=raid5 -dconvert=raid5 /mnt/btrfs
Done, had to relocate 6 out of 6 chunks
[root@ibm-p750e-02-lp1 profile-conversion]# umount /mnt/btrfs
[root@ibm-p750e-02-lp1 profile-conversion]# mount /dev/loop0 /mnt/btrfs
[root@ibm-p750e-02-lp1 profile-conversion]# btrfs scrub start -B /mnt/btrfs
scrub done for 12e251f9-bc07-4fbd-a25a-a50679bc3545
        scrub started at Sun Jan 12 22:25:24 2014 and finished after 0 seconds
        total bytes scrubbed: 7.50MiB with 0 errors
[root@ibm-p750e-02-lp1 profile-conversion]# echo $?
3


Version-Release number of selected component (if applicable):
btrfs-progs-3.12-1.el7
kernel-3.10.0-64.el7

How reproducible:
always

Steps to Reproduce:
1. mkfs -t btrfs -m raid0 -d raid0 -f -K /dev/loop{0..3}
2. mount /dev/loop0 /mnt/btrfs
3. btrfs fi balance start -mconvert=raid5 -dconvert=raid6 /mnt/btrfs
4. btrfs scrub start -B /mnt/btrfs

Actual results:
btrfs scrub returns 3, but no error messages in stderr nor in dmesg

Expected results:
btrfs scrub returns 0 or show some error messages if there're really some errors

Additional info:
Comment 1 Eryu Guan 2014-03-03 09:24:15 UTC 
1. mkfs -t btrfs -m raid0 -d raid0 -f -K /dev/loop{0..3}
2. mount /dev/loop0 /mnt/btrfs
3. btrfs fi balance start -mconvert=raid5 -dconvert=raid5 /mnt/btrfs
4. btrfs scrub start -B /mnt/btrfs

Still fails with btrfs-progs-3.12-4.el7
Comment 2 Wang Shilong 2014-03-22 07:19:37 UTC 
Created attachment 877550 [details]
Bug fix for your problem
Comment 3 Wang Shilong 2014-03-22 07:22:37 UTC 
(In reply to Wang Shilong from comment #2)
> Created attachment 877550 [details]
> Bug fix for your problem

This patch can be applied to btrfs-next, and it should can fix your problem, i'd like you can test it before i send this patch out to list.

Thanks for reporting.
Comment 5 Eric Sandeen 2014-07-17 02:59:59 UTC 
Note, FJ has sent a patchset for this:

[PATCH 1/4] btrfs-progs: adjust the return values for scrub
Comment 6 Eric Sandeen 2014-10-15 23:13:31 UTC 
Fixed in v3.16 with:
965cd86 btrfs-progs: adjust the return values for scrub

Closing this and others with NEXTRELEASE since it's part of a rebase, but if you prefer we can re-open, get all the acks, and add it to the errata.  I'm not sure if that's worth it, but if you want to, please let me know.

Thanks,
-Eric
Comment 7 Eric Sandeen 2014-10-15 23:18:14 UTC 
Actually, probably better to dup to the rebase bug.

*** This bug has been marked as a duplicate of bug 1134981 ***
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