btrfs: simplify check for extent item overrun at lookup_inline_extent_backref()

At lookup_inline_extent_backref() we can simplify the check for an overrun
of the extent item by making the while loop's condition to be "ptr < end"
and then check after the loop if an overrun happened ("ptr > end"). This
reduces indentation and makes the loop condition more clear. So move the
check out of the loop and change the loop condition accordingly, while
also adding the 'unlikely' tag to the check since it's not supposed to be
triggered.

Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Filipe Manana <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

1 files changed, 11 insertions, 11 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ae4380a7f88e..128fc7840160 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -883,17 +883,7 @@ again:
 		needed = BTRFS_REF_TYPE_BLOCK;
 
 	ret = -ENOENT;
-	while (1) {
-		if (ptr >= end) {
-			if (ptr > end) {
-				ret = -EUCLEAN;
-				btrfs_print_leaf(path->nodes[0]);
-				btrfs_crit(fs_info,
-"overrun extent record at slot %d while looking for inline extent for root %llu owner %llu offset %llu parent %llu",
-					path->slots[0], root_objectid, owner, offset, parent);
-			}
-			break;
-		}
+	while (ptr < end) {
 		iref = (struct btrfs_extent_inline_ref *)ptr;
 		type = btrfs_get_extent_inline_ref_type(leaf, iref, needed);
 		if (type == BTRFS_REF_TYPE_INVALID) {
@@ -940,6 +930,16 @@ again:
 		}
 		ptr += btrfs_extent_inline_ref_size(type);
 	}
+
+	if (unlikely(ptr > end)) {
+		ret = -EUCLEAN;
+		btrfs_print_leaf(path->nodes[0]);
+		btrfs_crit(fs_info,
+"overrun extent record at slot %d while looking for inline extent for root %llu owner %llu offset %llu parent %llu",
+			   path->slots[0], root_objectid, owner, offset, parent);
+		goto out;
+	}
+
 	if (ret == -ENOENT && insert) {
 		if (item_size + extra_size >=
 		    BTRFS_MAX_EXTENT_ITEM_SIZE(root)) {