btrfs: use appropriate define for the fsid

Though BTRFS_FSID_SIZE and BTRFS_UUID_SIZE are of the same size, we
should use the matching constant for the fsid buffer.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/check-integrity.c

@@ -1732,7 +1732,7 @@ static int btrfsic_test_for_metadata(struct btrfsic_state *state,
 	num_pages = state->metablock_size >> PAGE_SHIFT;
 	h = (struct btrfs_header *)datav[0];
 
-	if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
+	if (memcmp(h->fsid, fs_info->fsid, BTRFS_FSID_SIZE))
 		return 1;
 
 	for (i = 0; i < num_pages; i++) {

fs/btrfs/disk-io.c

@@ -529,7 +529,7 @@ static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
 				 struct extent_buffer *eb)
 {
 	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
-	u8 fsid[BTRFS_UUID_SIZE];
+	u8 fsid[BTRFS_FSID_SIZE];
 	int ret = 1;
 
 	read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
@@ -3681,7 +3681,7 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
 		btrfs_set_stack_device_io_width(dev_item, dev->io_width);
 		btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
 		memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
-		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
+		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_FSID_SIZE);
 
 		flags = btrfs_super_flags(sb);
 		btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
@@ -4120,7 +4120,7 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info)
 		ret = -EINVAL;
 	}
 
-	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
+	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
 		btrfs_err(fs_info,
 			   "dev_item UUID does not match fsid: %pU != %pU",
 			   fs_info->fsid, sb->dev_item.fsid);

fs/btrfs/scrub.c

@@ -1769,7 +1769,7 @@ static inline int scrub_check_fsid(u8 fsid[],
 	struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
 	int ret;
 
-	ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE);
+	ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
 	return !ret;
 }
 

fs/btrfs/volumes.c

@@ -1719,7 +1719,7 @@ static int btrfs_add_device(struct btrfs_trans_handle *trans,
 	ptr = btrfs_device_uuid(dev_item);
 	write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
 	ptr = btrfs_device_fsid(dev_item);
-	write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_UUID_SIZE);
+	write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_FSID_SIZE);
 	btrfs_mark_buffer_dirty(leaf);
 
 	ret = 0;
@@ -2249,7 +2249,7 @@ static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
 	struct btrfs_dev_item *dev_item;
 	struct btrfs_device *device;
 	struct btrfs_key key;
-	u8 fs_uuid[BTRFS_UUID_SIZE];
+	u8 fs_uuid[BTRFS_FSID_SIZE];
 	u8 dev_uuid[BTRFS_UUID_SIZE];
 	u64 devid;
 	int ret;
@@ -2292,7 +2292,7 @@ static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
 		read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
 				   BTRFS_UUID_SIZE);
 		read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
-				   BTRFS_UUID_SIZE);
+				   BTRFS_FSID_SIZE);
 		device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
 		BUG_ON(!device); /* Logic error */
 
@@ -6243,7 +6243,7 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 	cur_devices = fs_info->fs_devices;
 	while (cur_devices) {
 		if (!fsid ||
-		    !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
+		    !memcmp(cur_devices->fsid, fsid, BTRFS_FSID_SIZE)) {
 			device = find_device(cur_devices, devid, uuid);
 			if (device)
 				return device;
@@ -6518,7 +6518,7 @@ static struct btrfs_fs_devices *open_seed_devices(struct btrfs_fs_info *fs_info,
 
 	fs_devices = fs_info->fs_devices->seed;
 	while (fs_devices) {
-		if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE))
+		if (!memcmp(fs_devices->fsid, fsid, BTRFS_FSID_SIZE))
 			return fs_devices;
 
 		fs_devices = fs_devices->seed;
@@ -6571,16 +6571,16 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
 	struct btrfs_device *device;
 	u64 devid;
 	int ret;
-	u8 fs_uuid[BTRFS_UUID_SIZE];
+	u8 fs_uuid[BTRFS_FSID_SIZE];
 	u8 dev_uuid[BTRFS_UUID_SIZE];
 
 	devid = btrfs_device_id(leaf, dev_item);
 	read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
 			   BTRFS_UUID_SIZE);
 	read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
-			   BTRFS_UUID_SIZE);
+			   BTRFS_FSID_SIZE);
 
-	if (memcmp(fs_uuid, fs_info->fsid, BTRFS_UUID_SIZE)) {
+	if (memcmp(fs_uuid, fs_info->fsid, BTRFS_FSID_SIZE)) {
 		fs_devices = open_seed_devices(fs_info, fs_uuid);
 		if (IS_ERR(fs_devices))
 			return PTR_ERR(fs_devices);