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Btrfs: remove BUG_ON()'s in btrfs_map_block 

btrfs_map_block can go horribly wrong in the face of fs corruption, lets agree
to not be assholes and panic at any possible chance things are all fucked up.

Signed-off-by: Josef Bacik <jbacik@fb.com>
[ removed type casts ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2016-04-12 12:54:40 -04:00 committed by David Sterba
parent 3d8da67817
commit e042d1ec44
1 changed files with 16 additions and 2 deletions
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18
fs/btrfs/volumes.c
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@ -5290,7 +5290,15 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
stripe_nr = div64_u64(stripe_nr, stripe_len);
stripe_offset = stripe_nr * stripe_len;
BUG_ON(offset < stripe_offset);
if (offset < stripe_offset) {
btrfs_crit(fs_info, "stripe math has gone wrong, "
"stripe_offset=%llu, offset=%llu, start=%llu, "
"logical=%llu, stripe_len=%llu",
stripe_offset, offset, em->start, logical,
stripe_len);
free_extent_map(em);
return -EINVAL;
}
/* stripe_offset is the offset of this block in its stripe*/
stripe_offset = offset - stripe_offset;
@ -5531,7 +5539,13 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
&stripe_index);
mirror_num = stripe_index + 1;
}
BUG_ON(stripe_index >= map->num_stripes);
if (stripe_index >= map->num_stripes) {
btrfs_crit(fs_info, "stripe index math went horribly wrong, "
"got stripe_index=%u, num_stripes=%u",
stripe_index, map->num_stripes);
ret = -EINVAL;
goto out;
}
num_alloc_stripes = num_stripes;
if (dev_replace_is_ongoing) {