From be1a5564fd39fa2ca6adbb41c75fb08f96a1ffcb Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Mon, 8 Aug 2011 13:20:18 -0700 Subject: [PATCH] btrfs: Don't BUG_ON() errors in update_ref_for_cow() The only caller of update_ref_for_cow() is __btrfs_cow_block() which was originally ignoring any return values. update_ref_for_cow() however doesn't look like a candidate to become a void function - there are a few places where errors can occur. So instead I changed update_ref_for_cow() to bubble all errors up (instead of BUG_ON). __btrfs_cow_block() was then updated to catch and BUG_ON() any errors from update_ref_for_cow(). The end effect is that we have no change in behavior, but about 8 different places where a BUG_ON(ret) was removed. Obviously a future patch will have to address the BUG_ON() in __btrfs_cow_block(). Signed-off-by: Mark Fasheh --- fs/btrfs/ctree.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 9d472c2..e2e43c0 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -331,7 +331,8 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans, if (btrfs_block_can_be_shared(root, buf)) { ret = btrfs_lookup_extent_info(trans, root, buf->start, buf->len, &refs, &flags); - BUG_ON(ret); + if (ret) + return ret; BUG_ON(refs == 0); } else { refs = 1; @@ -375,7 +376,8 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans, buf->start, buf->len, new_flags, 0); - BUG_ON(ret); + if (ret) + return ret; } } else { if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { @@ -415,7 +417,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans, { struct btrfs_disk_key disk_key; struct extent_buffer *cow; - int level; + int level, ret; int last_ref = 0; int unlock_orig = 0; u64 parent_start; @@ -467,7 +469,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans, (unsigned long)btrfs_header_fsid(cow), BTRFS_FSID_SIZE); - update_ref_for_cow(trans, root, buf, cow, &last_ref); + ret = update_ref_for_cow(trans, root, buf, cow, &last_ref); + BUG_ON(ret); if (root->ref_cows) btrfs_reloc_cow_block(trans, root, buf, cow); -- 2.7.4