[PATCH] md: fix BUG when raid10 rebuilds without enough drives

This shouldn't be a BUG.  We should cope.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 834bf0f862225c471648fbea0863d8cb1541ad88..5bd1e9ec899d8b23f02d498664ca7d29c76a9a7c 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1474,7 +1474,13 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                                        }
                                }
                                if (j == conf->copies) {
-                                       BUG();
+                                       /* Cannot recover, so abort the recovery */
+                                       put_buf(r10_bio);
+                                       r10_bio = rb2;
+                                       if (!test_and_set_bit(MD_RECOVERY_ERR, &mddev->recovery))
+                                               printk(KERN_INFO "raid10: %s: insufficient working devices for recovery.\n",
+                                                      mdname(mddev));
+                                       break;
                                }
                        }
                if (biolist == NULL) {