I'm posting this here partly because I hope Chris Mason is reading(!) and partly
because it may be of some use to others on the list.
There seems to be a problem when reading from a deactivated snapshot of a
reiserfs volume that causes a panic.
The problem is caused by the fact that when a snapshot becomes full, LVM
returns I/O errors for the volume and when reiserfs hits an I/O error it panics.
The solution is, of course, to make your snapshots large enough that this never
happens :-) but just in case this is not possible the following patch may be of
use:
diff -u fs/reiserfs/namei.c.orig fs/reiserfs/namei.c
--- fs/reiserfs/namei.c.orig Thu Nov 29 16:13:28 2001
+++ fs/reiserfs/namei.c Thu Nov 29 16:34:49 2001
@@ -320,9 +320,10 @@
while (1) {
retval = search_by_entry_key (dir->i_sb, &key_to_search, path_to_entry, de);
- if (retval == IO_ERROR)
+ if (retval == IO_ERROR)
+ return NAME_NOT_FOUND;
// FIXME: still has to be dealt with
- reiserfs_panic (dir->i_sb, "zam-7001: io error in " __FUNCTION__ "\n");
+ // reiserfs_panic (dir->i_sb, "zam-7001: io error in " __FUNCTION__ "\n");
/* compare names for all entries having given hash value */
retval = linear_search_in_dir_item (&key_to_search, de, name, namelen);
patrick
