linux-kernel - Re: XFS assertion from truncate. (3.10-rc2)

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Date:	Tue, 21 May 2013 20:08:03 -0400
From:	Dave Jones <davej@...hat.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: XFS assertion from truncate. (3.10-rc2)

On Wed, May 22, 2013 at 09:54:10AM +1000, Dave Chinner wrote:
 > On Tue, May 21, 2013 at 07:40:16PM -0400, Dave Jones wrote:
 > > On Wed, May 22, 2013 at 09:34:29AM +1000, Dave Chinner wrote:
 > >  > On Tue, May 21, 2013 at 06:52:57PM -0400, Dave Jones wrote:
 > >  > > [  464.210598] XFS: Assertion failed: (mask & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID| ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0, file: fs/xfs/xfs_iops.c, line: 719
 > >  > 
 > >  > Never seen that fire before, but this is why we have ASSERT()s like
 > >  > this - we're being handed something by the VFS we don't expect...
 > >  > 
 > >  > Can you give me some context of the file permissions before the
 > >  > syscall and what the syscall parameters are? i.e. is this likely to
 > >  > be trying to strip SUID/SGID during the truncate operation?
 > > 
 > > no idea tbh. Is there something I can add to that assert to dump
 > > which file it was triggered by ?
 > 
 > Convert the assert to a if (), and then in the body do something
 > like:
 > 
 > 	if (mask & (...) {
 > 		char buf[MAX_PATHLEN];
 > 
 > 		d_path(VFS_I(ip)->i_dentry, buf, MAXPATHLEN);
 > 		xfs_warn(mp, "%s: mask 0x%x mismatch on file %s\n",
 > 			 __func__, mask, buf);
 > 		ASSERT(0);
 > 	}

fs/xfs/xfs_iops.c: In function ‘xfs_setattr_size’:
fs/xfs/xfs_iops.c:723:17: error: incompatible type for argument 1 of ‘d_path’
                 d_path(VFS_I(ip)->i_dentry, buf, MAXPATHLEN);
                 ^
In file included from include/linux/fs.h:8:0,
                 from include/linux/genhd.h:65,
                 from include/linux/blkdev.h:9,
                 from fs/xfs/xfs_linux.h:45,
                 from fs/xfs/xfs.h:32,
                 from fs/xfs/xfs_iops.c:18:
include/linux/dcache.h:338:14: note: expected ‘const struct path *’ but argument is of type ‘struct hlist_head’
 extern char *d_path(const struct path *, char *, int);
              ^


	Dave
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