[PATCH] Printk for ENOSPC due to lack of inodes

[Raghavendra D Prabhu]

Hi,

Thanks for the review. I have now moved it inside xfs_dialloc. 
Along with adding the message, I noticed that the loop 


	while (!agi->agi_freecount) {
	}

is redundant when noroom=1 and okalloc=0.

Also, xfs_ialloc_ag_alloc function in the loop calls  

============
	if (mp->m_maxicount &&
	    mp->m_sb.sb_icount + XFS_IALLOC_INODES(mp) > mp->m_maxicount) {

===============

condition again.

So I have moved xfs_tran_brelse etc. into the condition along 
with message.

Is this logic valid? If it is, then I will look into 
rate-limiting the message etc. 

* On Wed, Mar 07, 2012 at 11:39:24AM -0600, Eric Sandeen <sandeen at sandeen.net> wrote:
>On 2/26/12 6:37 PM, Raghavendra D Prabhu wrote:
>> Hi,
>>
>> While diagnosing a MySQL crash (on a Centos 5.7 box), I noticed that
>> it had failed with ENOSPC earlier; it was rebooted after that; now
>> after reboot, even though space was there, ENOSPC was showing up, I
>> also did df -i and it showed inodes available. At this point,
>> mounting with inode64 option was tried, which fixed it.
>> http://oss.sgi.com/archives/xfs/2011-03/msg00299.html helped me
>> here.
>
>Yeah, that's kind of a bummer.  And given the semi-ugly situation
>we're in with inode32, maybe a syslog message would be good.
>
>But a few things; I don't think we want to warn on every inode-allocation
>ENOSPC.  Ideally I'd probably do a WARN_ON_ONCE or a ratelimited printk.
>xfs_warn_once_per_fs()?  :)
>
>I'd probably also want to only do it in the case where the ENOSPC was due
>to either inode32, or due to fragmented freespace.
>
>Without looking very hard yet; could this be done in xfs_dialloc() so that
>the exact reason for the ENOSPC can be issued?  (maxicount, inode32, or
>no free contiguous space...)
>
>-Eric
>
>>
>> So, I have attached a patch here.
>>
>> =====================================================================
>>
>>
>> When a ENOSPC is encountered and it is due to lack of inodes (particularly
>> without inode64), it is not possible to detect this (df -i doesn't help here),
>> so adding a printk which can aid in detecting this.
>>
>> Signed-off-by: Raghavendra D Prabhu <rprabhu at wnohang.net>
>> ---
>>  fs/xfs/xfs_qm.c       |    3 +++
>>  fs/xfs/xfs_vnodeops.c |   10 ++++++++--
>>  2 files changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
>> index c872fea..fbefa87 100644
>> --- a/fs/xfs/xfs_qm.c
>> +++ b/fs/xfs/xfs_qm.c
>> @@ -987,6 +987,9 @@ xfs_qm_qino_alloc(
>>
>>      error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
>>      if (error) {
>> +        if (error == ENOSPC)
>> +            xfs_err(mp, "Out of inodes: Required %d, Current %llu, Maximum %llu",
>> +                    XFS_IALLOC_INODES(mp), mp->m_sb.sb_icount, mp->m_maxicount);
>>          xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
>>                   XFS_TRANS_ABORT);
>>          return error;
>> diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
>> index ebdb888..7542c36 100644
>> --- a/fs/xfs/xfs_vnodeops.c
>> +++ b/fs/xfs/xfs_vnodeops.c
>> @@ -946,8 +946,11 @@ xfs_create(
>>      error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
>>                     prid, resblks > 0, &ip, &committed);
>>      if (error) {
>> -        if (error == ENOSPC)
>> +        if (error == ENOSPC) {
>> +            xfs_err(mp, "Out of inodes: Required %d, Current %llu, Maximum %llu",
>> +                    XFS_IALLOC_INODES(mp), mp->m_sb.sb_icount, mp->m_maxicount);
>>              goto out_trans_cancel;
>> +        }
>>          goto out_trans_abort;
>>      }
>>
>> @@ -1610,8 +1613,11 @@ xfs_symlink(
>>      error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
>>                     prid, resblks > 0, &ip, NULL);
>>      if (error) {
>> -        if (error == ENOSPC)
>> +        if (error == ENOSPC) {
>> +            xfs_err(mp, "Out of inodes: Required %d, Current %llu, Maximum %llu",
>> +                    XFS_IALLOC_INODES(mp), mp->m_sb.sb_icount, mp->m_maxicount);
>>              goto error_return;
>> +        }
>>          goto error1;
>>      }
>>
>>
>>
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>
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Regards,
-- 
Raghavendra Prabhu
GPG Id : 0xD72BE977
Fingerprint: B93F EBCB 8E05 7039 CD3C A4B8 A616 DCA1 D72B E977
www: wnohang.net
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