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authorDavid Woodhouse <dwmw2@infradead.org>2009-07-22 20:49:01 (GMT)
committerChris Mason <chris.mason@oracle.com>2009-07-22 20:49:01 (GMT)
commit3acada49c2794c5aac21849e2ea05790c6dd2faa (patch)
tree0b8fe86b5ce08aac59014053a5fb1738b9705609 /fs/btrfs/volumes.c
parent29c5e8ce01f9dad7e24b99c21e4f836d6b0289e0 (diff)
downloadlinux-3acada49c2794c5aac21849e2ea05790c6dd2faa.tar.xz
Btrfs: Remove broken sanity check from btrfs_rmap_block()
It was never actually doing anything anyway (see the loop condition), and it would be difficult to make it work for RAID[56]. Even if it was actually working, it's checking for the wrong thing anyway. Instead of checking whether we list a block which _doesn't_ land at the relevant physical location, it should be checking that we _have_ listed all the logical blocks which refer to the required physical location on all devices. This function is only called from remove_sb_from_cache() to ensure that we reserve the logical blocks which would reside at the same physical location as the superblock copies. So listing more blocks than we need is actually OK. With RAID[56] we're going to throw away an entire stripe for each block we have to ignore, so we _are_ going to list blocks other than the ones which actually contain the superblock. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c20
1 files changed, 0 insertions, 20 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f057730..55c3727 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2795,26 +2795,6 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
}
}
- for (i = 0; i > nr; i++) {
- struct btrfs_multi_bio *multi;
- struct btrfs_bio_stripe *stripe;
- int ret;
-
- length = 1;
- ret = btrfs_map_block(map_tree, WRITE, buf[i],
- &length, &multi, 0);
- BUG_ON(ret);
-
- stripe = multi->stripes;
- for (j = 0; j < multi->num_stripes; j++) {
- if (stripe->physical >= physical &&
- physical < stripe->physical + length)
- break;
- }
- BUG_ON(j >= multi->num_stripes);
- kfree(multi);
- }
-
*logical = buf;
*naddrs = nr;
*stripe_len = map->stripe_len;