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SubjectRe: 2.6.0-test2: resiserfs BUG on Alt-SysRq-U
Hello!

On Mon, Aug 04, 2003 at 08:56:15PM +0400, Andrey Borzenkov wrote:

> this has been around since 2.5.75 at least and may be before it as well.
> kernel BUG at fs/reiserfs/journal.c:409!

Hm, indeed.
So they are calling ->remount() without lock_kernel these days.
The patch below should help, please verify.

Thank you.

Bye,
Oleg
===== fs/reiserfs/super.c 1.66 vs edited =====
--- 1.66/fs/reiserfs/super.c Sat Jun 21 00:16:06 2003
+++ edited/fs/reiserfs/super.c Tue Aug 5 12:22:10 2003
@@ -761,6 +761,7 @@
if (!reiserfs_parse_options(s, arg, &mount_options, &blocks, NULL))
return -EINVAL;

+ reiserfs_write_lock(s);
handle_attrs(s);

/* Add options that are safe here */
@@ -778,17 +779,22 @@

if(blocks) {
int rc = reiserfs_resize(s, blocks);
- if (rc != 0)
+ if (rc != 0) {
+ reiserfs_write_unlock(s);
return rc;
+ }
}

if (*mount_flags & MS_RDONLY) {
/* remount read-only */
- if (s->s_flags & MS_RDONLY)
+ if (s->s_flags & MS_RDONLY) {
/* it is read-only already */
+ reiserfs_write_unlock(s);
return 0;
+ }
/* try to remount file system with read-only permissions */
if (sb_umount_state(rs) == REISERFS_VALID_FS || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
+ reiserfs_write_unlock(s);
return 0;
}

@@ -800,8 +806,10 @@
s->s_dirt = 0;
} else {
/* remount read-write */
- if (!(s->s_flags & MS_RDONLY))
+ if (!(s->s_flags & MS_RDONLY)) {
+ reiserfs_write_unlock(s);
return 0; /* We are read-write already */
+ }

REISERFS_SB(s)->s_mount_state = sb_umount_state(rs) ;
s->s_flags &= ~MS_RDONLY ; /* now it is safe to call journal_begin */
@@ -824,6 +832,7 @@
if (!( *mount_flags & MS_RDONLY ) )
finish_unfinished( s );

+ reiserfs_write_unlock(s);
return 0;
}

-
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