Re: How to use increased number of ACL entries?

Michael L. Semon
2013-11-04T04:18:17Z

On 11/03/2013 09:37 PM, Eric Sandeen wrote:
> On 11/3/13, 6:39 PM, Dave Chinner wrote:
>> On Sun, Nov 03, 2013 at 09:17:04AM +0100, Kasparek Tomas wrote:
>>> Hello,
>>>
>>> I'm trying to get more then 25 ACLs entries to work according to
>>> http://oss.sgi.com/pipermail/xfs/2013-May/026544.html . I'm running 3.10.x
>>> kernel which seems to contain these changes. I understand, that this is
>>> on-disk format change, so I expect to need new xfsprogs too. I tried the
>>> version from CentOS 6.4 (3.1.1) and one from git repo (
>>> git://oss.sgi.com/xfs/cmds/xfsprogs), but still it fails to create more then
>>> 25 ACL entries (21 user defined). Is there something I'm still missing?
>>
>> You haven't told mkfs to change the on disk format to enable more
>> than 25 ACLs. Only the version from git will do it, and your CentOS
>> kernel will not support it.
>
> but the 3.10.x kernel you're running will IIRC; use "-m crc=1" on the mkfs.xfs
> commandline from a git mkfs.xfs.
>
> -Eric
>
>> Cheers,
>>
>> Dave.

Y'know, Eric, your best suggestions are always made when I'm working on a
non-test PC that I don't really want to touch ;-) But anyway, (i686 Pentium
4, kernel 3.10.17)...

git xfsprogs will make the filesystem in question:

root@bpserver:/storage/devel/git-xfsprogs# mkfs/mkfs.xfs /dev/sdb3
mkfs.xfs: /dev/sdb3 appears to contain an existing filesystem (swap).
mkfs.xfs: Use the -f option to force overwrite.
root@bpserver:/storage/devel/git-xfsprogs# mkfs/mkfs.xfs -f -m crc=1 /dev/sdb3
meta-data=/dev/sdb3 isize=512 agcount=4, agsize=65536 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1
data = bsize=4096 blocks=262144, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=12800, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

However, it should be dirent (ftype=1 in the above output) that keeps a
vanilla 3.10.17 kernel from mounting the resulting filesystem:

[438326.624667] XFS (sdb3): Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!
[438326.624667] Use of these features in this kernel is at your own risk!
[438326.624762] XFS (sdb3): Superblock has unknown incompatible features (0x1) enabled.
[438326.624762] Filesystem can not be safely mounted by this kernel.
[438326.624769] 8d76c000: 58 46 53 42 00 00 10 00 00 00 00 00 00 04 00 00 XFSB............
[438326.624833] 8d76c010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[438326.624897] 8d76c020: 60 b9 e2 ff 8f c5 41 f5 87 32 bc ea 7d 7b 8c 1b `.....A..2..}{..
[438326.624961] 8d76c030: 00 00 00 00 00 02 00 04 00 00 00 00 00 00 00 40 ...............@
[438326.625026] XFS (sdb3): Internal error xfs_sb_read_verify at line 730 of file fs/xfs/xfs_mount.c. Caller 0x81123144
[438326.625026]
[438326.625108] CPU: 0 PID: 58 Comm: kworker/0:1H Not tainted 3.10.17 #2
[438326.625110] Hardware name: Dell Computer Corporation Dimension 3000 /0N6381, BIOS A02 11/08/2004
[438326.625119] Workqueue: xfslogd xfs_buf_iodone_work
[438326.625123] a4b38400 a4b38400 bde73e90 813ab881 bde73eb4 81124b91 a4b38400 00000008
[438326.625130] 814593ac 813c5439 000002da 8145fee6 81123144 bde73ed4 81124bd6 8145fee6
[438326.625136] 000002da 81123144 954cf500 00000016 a4b38400 bde73f00 811693c4 8d76c000
[438326.625142] Call Trace:
[438326.625151] [<813ab881>] dump_stack+0x16/0x18
[438326.625155] [<81124b91>] xfs_error_report+0x45/0x47
[438326.625160] [<81123144>] ? xfs_buf_iodone_work+0x52/0x67
[438326.625163] [<81124bd6>] xfs_corruption_error+0x43/0x5d
[438326.625167] [<81123144>] ? xfs_buf_iodone_work+0x52/0x67
[438326.625173] [<811693c4>] xfs_sb_read_verify+0xd4/0xe5
[438326.625177] [<81123144>] ? xfs_buf_iodone_work+0x52/0x67
[438326.625181] [<81123144>] xfs_buf_iodone_work+0x52/0x67
[438326.625187] [<81038920>] process_one_work+0xd5/0x2eb
[438326.625191] [<8103923c>] worker_thread+0xea/0x2f8
[438326.625196] [<81039152>] ? manage_workers.isra.37+0x21a/0x21a
[438326.625200] [<8103d4c4>] kthread+0x8e/0x90
[438326.625207] [<813af737>] ret_from_kernel_thread+0x1b/0x28
[438326.625211] [<8103d436>] ? kthread_worker_fn+0xd3/0xd3
[438326.625214] XFS (sdb3): Corruption detected. Unmount and run xfs_repair
[438326.625271] XFS (sdb3): SB validate failed with error 22.

I don't know if the CentOS kernel has any extra patches that would enable
this filesystem to be mounted.

There might be a way to bisect or revert the git xfsprogs back before dirent
and giving that a try. However, it seems best to start working with v5/CRC
XFS starting with kernel 3.11. If my luck with recent AIO commits was better,
I'd recommend 3.12 instead because that's the real correct answer, problems
aside.

Thanks!

Michael