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btrfs: Go readonly on bad extent refs in update_ref_for_cow()

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update_ref_for_cow() will BUG_ON() after it's call to
btrfs_lookup_extent_info() if no existing references are found.  Since refs
are computed directly from disk, this should be treated as a corruption
instead of a logic error.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
This commit is contained in:
Mark Fasheh 2011-08-29 14:17:04 -07:00 committed by David Sterba
parent 4ed1d16e94
commit e5df957328
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/ctree.c
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@ -333,7 +333,11 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
buf->len, &refs, &flags);
if (ret)
return ret;
BUG_ON(refs == 0);
if (refs == 0) {
ret = -EROFS;
btrfs_std_error(root->fs_info, ret);
return ret;
}
} else {
refs = 1;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||