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Subject[BUG] loop.c oopses
loop.c oopses when bio_copy() returns NULL. This was encountered while
running dbench 16 on a loopback-mounted reiserfs filesystem.

It still gets buffer layer errors with this patch, but they appear to
be non-fatal.

Backtrace from buffer layer errors:

Trace; c013ec00 <try_to_free_buffers+158/228>
Trace; c01bbbea <reiserfs_releasepage+66/90>
Trace; c013d727 <try_to_release_page+3f/54>
Trace; c013192d <shrink_cache+241/3d4>
Trace; c0131c57 <shrink_caches+5f/94>
Trace; c0131cac <try_to_free_pages+20/44>
Trace; c0132800 <balance_classzone+40/188>
Trace; c01bbb0d <reiserfs_commit_write+f1/168>
Trace; c0132a9b <__alloc_pages+153/1a0>
Trace; c01327b9 <_alloc_pages+19/20>
Trace; c012dac8 <generic_file_write+458/648>
Trace; c013b2af <vfs_write+9b/120>
Trace; c013b39e <sys_write+2a/40>
Trace; c010899b <syscall_call+7/b>

If what I've done is proper, it may be necessary to allow
try_to_free_buffers() to fail if (!was_uptodate && PageUptodate(page))

Below is the attempt I made to fix this (be gentle, I'm no block io expert):


===== drivers/block/loop.c 1.51 vs edited =====
--- 1.51/drivers/block/loop.c Sun Jun 16 15:50:19 2002
+++ edited/drivers/block/loop.c Tue Jul 16 00:02:22 2002
@@ -458,6 +458,9 @@

bio = bio_copy(rbh, GFP_NOIO, rbh->bi_rw & WRITE);

+ if (!bio)
+ return NULL;
bio->bi_end_io = loop_end_io_transfer;
bio->bi_private = rbh;

@@ -477,6 +480,9 @@
struct bio_vec *from_bvec, *to_bvec;
char *vto, *vfrom;
int ret = 0, i;
+ if (!to_bio)
+ return -ENOMEM;

__bio_for_each_segment(from_bvec, from_bio, i, 0) {
to_bvec = &to_bio->bi_io_vec[i];
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