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Add logic to try and recover an inode with an invalid mode

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When an inode is detected with invalid mode bits the safe thing to
do is panic the system.  This indicates a problem with the contents
of a dnode and it should never be possible.  This is the default
behavior.

Unfortunately, due to flaws in the system attribute (SA) implementation
(on all platforms) it was possible that ZFS could create a damaged dnode.
This was a rare issue which only impacted dnodes which used a spill
block.  Normally only symlinks and files with ACLs would require a
spill block.  However, if the dataset had the xattr=sa property set
and extended attributes were used this problem could occur.

As of the 0.6.4 tag the root cause of this issue has been fixed.  For
pools which are exhibiting this damage the 'zfs_recover=1' module option
may be set.  This will cause ZFS to interpret the dnode with invalid
mode bits as a normal file.  This may allow the files to be accessed
for recovery purposes.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3548
This commit is contained in:
Brian Behlendorf 2015-07-13 14:51:59 -07:00
parent 47a4a6fd5f
commit 53b1d9794e
1 changed files with 11 additions and 4 deletions
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15
module/zfs/zfs_znode.c
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@ -329,8 +329,8 @@ zfs_inode_set_ops(zfs_sb_t *zsb, struct inode *ip)
*/ */
case S_IFCHR: case S_IFCHR:
case S_IFBLK: case S_IFBLK:
VERIFY(sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zsb), sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zsb), &rdev,
&rdev, sizeof (rdev)) == 0); sizeof (rdev));
/*FALLTHROUGH*/ /*FALLTHROUGH*/
case S_IFIFO: case S_IFIFO:
case S_IFSOCK: case S_IFSOCK:
@ -339,8 +339,15 @@ zfs_inode_set_ops(zfs_sb_t *zsb, struct inode *ip)
break; break;
default: default:
printk("ZFS: Invalid mode: 0x%x\n", ip->i_mode); zfs_panic_recover("inode %llu has invalid mode: 0x%x\n",
VERIFY(0); (u_longlong_t)ip->i_ino, ip->i_mode);
/* Assume the inode is a file and attempt to continue */
ip->i_mode = S_IFREG | 0644;
ip->i_op = &zpl_inode_operations;
ip->i_fop = &zpl_file_operations;
ip->i_mapping->a_ops = &zpl_address_space_operations;
break;
} }
} }