[PATCH] Printk for ENOSPC due to lack of inodes

[Eric Sandeen]

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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