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Re: XFS internal error xfs_iformat(realtime) even after xfs_repair.

To: Ajeet Yadav <ajeet.yadav.77@xxxxxxxxx>
Subject: Re: XFS internal error xfs_iformat(realtime) even after xfs_repair.
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 18 Jan 2011 15:57:30 +1100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <AANLkTin=nqXCVJRgqBuTDx6nxMx1GLiG2DortJG+pz2L@xxxxxxxxxxxxxx>
References: <AANLkTin=nqXCVJRgqBuTDx6nxMx1GLiG2DortJG+pz2L@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Mon, Jan 17, 2011 at 09:12:54PM +0900, Ajeet Yadav wrote:
> Kernel: 2.6.30.9, XFS backported from 2.6.34, xfsprogs-3.0.5
> 
> I used a script
> 1. create some file, directories, symlinks
> 2. unmount the file system
> 3. run xfs_bd with blocktrash
> 4. xfs_xfsrepair -L
> 5. list "ls -lR"
> 6. remove all file and directory "rm -rf *

OK, so you are effectively corrupting random blocks by introducing
random bit errors in the blocks. No surprise that some errors are
not being detected - what is the blocktrash command that you are
using?

> Often during testing I get the below backtrace from kernel during ls, rm
> even though I already run xfs_repair on it.
> Is it related to xfsrepair or xfs ?. I think xfs_repair must have detected
> this problem and corrected it.

xfs_repair is not checking the di_flags field in the inode for
sanity, hence having a wrong flag set is going unnoticed.

> There is similar problem already reported by
> http://oss.sgi.com/archives/xfs/2010-06/msg00349.html

Similar error message (xfs_iformt found an inode corruption), but
that one is a completely different problem.

Does the patch below (compile tested only) detect the bad inode?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

xfs_repair: validate inode di_flags field

xfs_repair is not validating the di_flags field in the inode for
sanity. Block fuzzing indicates that we are not picking situations
like the RT bit being set on filesystems without realtime devices.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
 repair/dinode.c |   62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/repair/dinode.c b/repair/dinode.c
index 2fa850d..e05d4e0 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -2519,6 +2519,68 @@ process_dinode_int(xfs_mount_t *mp,
                goto clear_bad_out;
        }
 
+       /*
+        * check that we only have valid flags set, and those that are set make
+        * sense.
+        */
+       if (dino->di_flags) {
+               uint16_t flags = be16_to_cpu(dino->di_flags);
+
+               if (flags & ~XFS_DIFLAG_ANY) {
+                       do_warn(_("Bad flags set in inode %llu"), lino);
+                       flags &= ~XFS_DIFLAG_ANY;
+               }
+
+               if (flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_RTINHERIT)) {
+                       /* need an rt-dev! */
+                       if (!rt_name) {
+                               do_warn(_(
+       "inode %llu has RT flag set but there is no RT device"), lino);
+                               flags &= ~(XFS_DIFLAG_REALTIME |
+                                               XFS_DIFLAG_RTINHERIT);
+                       }
+               }
+               if (flags & XFS_DIFLAG_NEWRTBM_BIT) {
+                       /* must be a rt bitmap inode */
+                       if (lino != mp->m_sb.sb_rbmino) {
+                               do_warn(_("inode %llu not rt bitmap"), lino);
+                               flags &= ~XFS_DIFLAG_NEWRTBM_BIT;
+                       }
+               }
+               if (flags & (XFS_DIFLAG_RTINHERIT |
+                            XFS_DIFLAG_EXTSZINHERIT |
+                            XFS_DIFLAG_PROJINHERIT |
+                            XFS_DIFLAG_NOSYMLINKS)) {
+                       /* must be a directory */
+                       if (di_mode && !S_ISDIR(di_mode)) {
+                               do_warn(_(
+                       "directory flags set on non-directory inode %llu"),
+                                       lino);
+                               flags &= ~(XFS_DIFLAG_RTINHERIT |
+                                               XFS_DIFLAG_EXTSZINHERIT |
+                                               XFS_DIFLAG_PROJINHERIT |
+                                               XFS_DIFLAG_NOSYMLINKS);
+                       }
+               }
+               if (flags & (XFS_DIFLAG_REALTIME | XFS_XFLAG_EXTSIZE)) {
+                       /* must be a file */
+                       if (di_mode && !S_ISREG(di_mode)) {
+                               do_warn(_(
+                       "file flags set on non-file inode %llu"), lino);
+                               flags &= ~(XFS_DIFLAG_REALTIME |
+                                               XFS_XFLAG_EXTSIZE);
+                       }
+               }
+               if (!verify_mode && flags != be16_to_cpu(dino->di_flags)) {
+                       if (!no_modify) {
+                               do_warn(_(", fixing bad flags.\n"));
+                               dino->di_flags = cpu_to_be16(flags);
+                               *dirty = 1;
+                       } else
+                               do_warn(_(", would fix bad flags.\n"));
+               }
+       }
+
        if (verify_mode)
                return retval;
 

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