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authorNikolay Borisov <nborisov@suse.com>2020-02-18 17:56:07 +0300
committerDavid Sterba <dsterba@suse.com>2020-03-23 19:01:41 +0300
commit560b7a4aa2258e27ad38eb417aabebc1e2c05f5f (patch)
treeebf708c69f70656b7c2f89361b096fb6b0294925 /fs/btrfs/uuid-tree.c
parentc17af96554a8a8777cbb0fd53b8497250e548b43 (diff)
downloadlinux-560b7a4aa2258e27ad38eb417aabebc1e2c05f5f.tar.xz
btrfs: call btrfs_check_uuid_tree_entry directly in btrfs_uuid_tree_iterate
btrfs_uuid_tree_iterate is called from only once place and its 2nd argument is always btrfs_check_uuid_tree_entry. Simplify btrfs_uuid_tree_iterate's signature by removing its 2nd argument and directly calling btrfs_check_uuid_tree_entry. Also move the latter into uuid-tree.h. No functional changes. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/uuid-tree.c')
-rw-r--r--fs/btrfs/uuid-tree.c53
1 files changed, 49 insertions, 4 deletions
diff --git a/fs/btrfs/uuid-tree.c b/fs/btrfs/uuid-tree.c
index 76b84f2397b1..dc95e954ebbe 100644
--- a/fs/btrfs/uuid-tree.c
+++ b/fs/btrfs/uuid-tree.c
@@ -246,9 +246,53 @@ out:
return ret;
}
-int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
- int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
- u64))
+/*
+ * Check if there's an matching subvolume for given UUID
+ *
+ * Return:
+ * 0 check succeeded, the entry is not outdated
+ * > 0 if the check failed, the caller should remove the entry
+ * < 0 if an error occurred
+ */
+static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
+ u8 *uuid, u8 type, u64 subvolid)
+{
+ struct btrfs_key key;
+ int ret = 0;
+ struct btrfs_root *subvol_root;
+
+ if (type != BTRFS_UUID_KEY_SUBVOL &&
+ type != BTRFS_UUID_KEY_RECEIVED_SUBVOL)
+ goto out;
+
+ key.objectid = subvolid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ subvol_root = btrfs_get_fs_root(fs_info, &key, true);
+ if (IS_ERR(subvol_root)) {
+ ret = PTR_ERR(subvol_root);
+ if (ret == -ENOENT)
+ ret = 1;
+ goto out;
+ }
+
+ switch (type) {
+ case BTRFS_UUID_KEY_SUBVOL:
+ if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE))
+ ret = 1;
+ break;
+ case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
+ if (memcmp(uuid, subvol_root->root_item.received_uuid,
+ BTRFS_UUID_SIZE))
+ ret = 1;
+ break;
+ }
+ btrfs_put_root(subvol_root);
+out:
+ return ret;
+}
+
+int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = fs_info->uuid_root;
struct btrfs_key key;
@@ -305,7 +349,8 @@ again_search_slot:
read_extent_buffer(leaf, &subid_le, offset,
sizeof(subid_le));
subid_cpu = le64_to_cpu(subid_le);
- ret = check_func(fs_info, uuid, key.type, subid_cpu);
+ ret = btrfs_check_uuid_tree_entry(fs_info, uuid,
+ key.type, subid_cpu);
if (ret < 0)
goto out;
if (ret > 0) {