[PATCH] Printk for ENOSPC due to lack of inodes

[Raghavendra D Prabhu]

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.

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;
  	}
  
-- 
1.7.9.2

Regards,
-- 
Raghavendra Prabhu
GPG Id : 0xD72BE977
Fingerprint: B93F EBCB 8E05 7039 CD3C A4B8 A616 DCA1 D72B E977
www: wnohang.net
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