Btrfs: fix deadlock when mounting a degraded fs

The deadlock happened when we mount degraded filesystem, the reproduced
steps are following:
 # mkfs.btrfs -f -m raid1 -d raid1 <dev0> <dev1>
 # echo 1 > /sys/block/`basename <dev0>`/device/delete
 # mount -o degraded <dev1> <mnt>

The reason was that the counter -- bi_remaining was wrong. If the missing
or unwriteable device was the last device in the mapping array, we would
not submit the original bio, so we shouldn't increase bi_remaining of it
in btrfs_end_bio(), or we would skip the final endio handle.

Fix this problem by adding a flag into btrfs bio structure. If we submit
the original bio, we will set the flag, and we increase bi_remaining counter,
or we don't.

Though there is another way to fix it -- decrease bi_remaining counter of the
original bio when we make sure the original bio is not submitted, this method
need add more check and is easy to make mistake.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 31f9036f3171..4ca3c92a54b3 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5415,8 +5415,12 @@ static void btrfs_end_bio(struct bio *bio, int err)
                         set_bit(BIO_UPTODATE, &bio->bi_flags);
                         err = 0;
                 }
+
+                if (likely(bbio->flags & BTRFS_BIO_ORIG_BIO_SUBMITTED))
+                        bio_endio_nodec(bio, err);
+                else
+                        bio_endio(bio, err);
                 kfree(bbio);
-                bio_endio_nodec(bio, err);
         } else if (!is_orig_bio) {
                 bio_put(bio);
         }
@@ -5671,6 +5675,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
                         BUG_ON(!bio); /* -ENOMEM */
                 } else {
                         bio = first_bio;
+                        bbio->flags |= BTRFS_BIO_ORIG_BIO_SUBMITTED;
                 }
 
                 submit_stripe_bio(root, bbio, bio,
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 1a15bbeb65e2..2aaa00c47816 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -190,11 +190,14 @@ struct btrfs_bio_stripe {
 struct btrfs_bio;
 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
 
+#define BTRFS_BIO_ORIG_BIO_SUBMITTED    0x1
+
 struct btrfs_bio {
         atomic_t stripes_pending;
         struct btrfs_fs_info *fs_info;
         bio_end_io_t *end_io;
         struct bio *orig_bio;
+        unsigned long flags;
         void *private;
         atomic_t error;
         int max_errors;