[PATCH] reiserfs: reiserfs write_ordered_buffers should not oops on dirty non-uptodate bh

write_ordered_buffers should handle dirty non-uptodate buffers without a
BUG()

Signed-off-by: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 1b2402a..47c9f43 100644 (file)
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -846,6 +846,14 @@ static int write_ordered_buffers(spinlock_t * lock,
                        spin_lock(lock);
                        goto loop_next;
                }
+               /* in theory, dirty non-uptodate buffers should never get here,
+                * but the upper layer io error paths still have a few quirks.
+                * Handle them here as gracefully as we can
+                */
+               if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
+                       clear_buffer_dirty(bh);
+                       ret = -EIO;
+               }
                if (buffer_dirty(bh)) {
                        list_del_init(&jh->list);
                        list_add(&jh->list, &tmp);
@@ -1030,9 +1038,12 @@ static int flush_commit_list(struct super_block *s,
        }
 
        if (!list_empty(&jl->j_bh_list)) {
+               int ret;
                unlock_kernel();
-               write_ordered_buffers(&journal->j_dirty_buffers_lock,
-                                     journal, jl, &jl->j_bh_list);
+               ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
+                                           journal, jl, &jl->j_bh_list);
+               if (ret < 0 && retval == 0)
+                       retval = ret;
                lock_kernel();
        }
        BUG_ON(!list_empty(&jl->j_bh_list));