From: David Sterba <dsterba@suse.com>
Date: Tue, 26 Jun 2018 14:20:59 +0000 (+0200)
Subject: btrfs: annotate unlikely branches after V0 extent type removal
X-Git-Tag: 4.19-rc-smb3~133^2~117
X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=6d8ff4e4584cd84093b751671351c8103ead551d

btrfs: annotate unlikely branches after V0 extent type removal

The v0 extent type checks are the right case for the unlikely
annotations as we don't expect to ever see them, so let's give the
compiler some hint.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 71283faa85e2..352b7e95f657 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1304,7 +1304,7 @@ static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
 		ref2 = btrfs_item_ptr(leaf, path->slots[0],
 				      struct btrfs_shared_data_ref);
 		num_refs = btrfs_shared_data_ref_count(leaf, ref2);
-	} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
+	} else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) {
 		btrfs_print_v0_err(trans->fs_info);
 		btrfs_abort_transaction(trans, -EINVAL);
 		return -EINVAL;
@@ -1555,7 +1555,7 @@ again:
 
 	leaf = path->nodes[0];
 	item_size = btrfs_item_size_nr(leaf, path->slots[0]);
-	if (item_size < sizeof(*ei)) {
+	if (unlikely(item_size < sizeof(*ei))) {
 		err = -EINVAL;
 		btrfs_print_v0_err(fs_info);
 		btrfs_abort_transaction(trans, err);
@@ -2285,7 +2285,7 @@ again:
 	leaf = path->nodes[0];
 	item_size = btrfs_item_size_nr(leaf, path->slots[0]);
 
-	if (item_size < sizeof(*ei)) {
+	if (unlikely(item_size < sizeof(*ei))) {
 		err = -EINVAL;
 		btrfs_print_v0_err(fs_info);
 		btrfs_abort_transaction(trans, err);
@@ -6822,7 +6822,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 
 	leaf = path->nodes[0];
 	item_size = btrfs_item_size_nr(leaf, extent_slot);
-	if (item_size < sizeof(*ei)) {
+	if (unlikely(item_size < sizeof(*ei))) {
 		ret = -EINVAL;
 		btrfs_print_v0_err(info);
 		btrfs_abort_transaction(trans, ret);
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index cc945376c244..df49931ffe92 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -52,7 +52,7 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 	u64 offset;
 	int ref_index = 0;
 
-	if (item_size < sizeof(*ei)) {
+	if (unlikely(item_size < sizeof(*ei))) {
 		btrfs_print_v0_err(eb->fs_info);
 		btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
 	}
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index eaf59c742dc8..229f721cbde9 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -830,7 +830,7 @@ again:
 			edge->node[UPPER] = upper;
 
 			goto next;
-		} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
+		} else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) {
 			err = -EINVAL;
 			btrfs_print_v0_err(rc->extent_root->fs_info);
 			btrfs_handle_fs_error(rc->extent_root->fs_info, err,
@@ -3325,7 +3325,7 @@ static int add_tree_block(struct reloc_control *rc,
 			level = (int)extent_key->offset;
 		}
 		generation = btrfs_extent_generation(eb, ei);
-	} else if (item_size == sizeof(struct btrfs_extent_item_v0)) {
+	} else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) {
 		btrfs_print_v0_err(eb->fs_info);
 		btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
 		return -EINVAL;
@@ -3742,7 +3742,7 @@ int add_data_references(struct reloc_control *rc,
 					      struct btrfs_extent_data_ref);
 			ret = find_data_references(rc, extent_key,
 						   eb, dref, blocks);
-		} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
+		} else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) {
 			btrfs_print_v0_err(eb->fs_info);
 			btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
 			ret = -EINVAL;
@@ -3984,7 +3984,7 @@ restart:
 			flags = btrfs_extent_flags(path->nodes[0], ei);
 			ret = check_extent_flags(flags);
 			BUG_ON(ret);
-		} else if (item_size == sizeof(struct btrfs_extent_item_v0)) {
+		} else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) {
 			err = -EINVAL;
 			btrfs_print_v0_err(trans->fs_info);
 			btrfs_abort_transaction(trans, err);