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authorMisono Tomohiro <misono.tomohiro@jp.fujitsu.com>2018-03-23 17:16:49 +0900
committerDavid Sterba <dsterba@suse.com>2018-03-30 22:15:54 +0200
commit0a0a03554aaf56a6e7245e74fa7d8b3c53f1c20f (patch)
treec78e8b0fb65cd6516fb4cec7569182688ab4fe3e
parent30b852cd7e2299ba7795cd302d783724d88e101f (diff)
btrfs-progs: mkfs: add uuid and otime to ROOT_ITEM of, FS_TREE
Currently, the top-level subvolume lacks the UUID. As a result, both non-snapshot subvolume and snapshot of top-level subvolume do not have Parent UUID and cannot be distinguisued. Therefore "fi show" of top-level lists all the subvolumes which lacks the UUID in "Snapshot(s)" filed. Also, it lacks the otime information. Fix this by adding the UUID and otime at the mkfs time. As a consequence, snapshots of top-level subvolume now have a Parent UUID and UUID tree will create an entry for top-level subvolume at mount time. This should not cause the problem for current kernel, but user program which relies on the empty Parent UUID may be affected by this change. Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--mkfs/common.c14
-rw-r--r--mkfs/main.c5
2 files changed, 19 insertions, 0 deletions
diff --git a/mkfs/common.c b/mkfs/common.c
index 16916ca..6924d9b 100644
--- a/mkfs/common.c
+++ b/mkfs/common.c
@@ -44,6 +44,7 @@ static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
u32 itemoff;
int ret = 0;
int blk;
+ u8 uuid[BTRFS_UUID_SIZE];
memset(buf->data + sizeof(struct btrfs_header), 0,
cfg->nodesize - sizeof(struct btrfs_header));
@@ -77,6 +78,19 @@ static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
btrfs_set_item_size(buf, btrfs_item_nr(nritems),
sizeof(root_item));
+ if (blk == MKFS_FS_TREE) {
+ time_t now = time(NULL);
+
+ uuid_generate(uuid);
+ memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+ btrfs_set_stack_timespec_sec(&root_item.otime, now);
+ btrfs_set_stack_timespec_sec(&root_item.ctime, now);
+ } else {
+ memset(uuid, 0, BTRFS_UUID_SIZE);
+ memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+ btrfs_set_stack_timespec_sec(&root_item.otime, 0);
+ btrfs_set_stack_timespec_sec(&root_item.ctime, 0);
+ }
write_extent_buffer(buf, &root_item,
btrfs_item_ptr_offset(buf, nritems),
sizeof(root_item));
diff --git a/mkfs/main.c b/mkfs/main.c
index 5a717f7..40efa26 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -315,6 +315,7 @@ static int create_tree(struct btrfs_trans_handle *trans,
struct btrfs_key location;
struct btrfs_root_item root_item;
struct extent_buffer *tmp;
+ u8 uuid[BTRFS_UUID_SIZE] = {0};
int ret;
ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
@@ -325,6 +326,10 @@ static int create_tree(struct btrfs_trans_handle *trans,
btrfs_set_root_bytenr(&root_item, tmp->start);
btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
btrfs_set_root_generation(&root_item, trans->transid);
+ /* clear uuid and o/ctime of source tree */
+ memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+ btrfs_set_stack_timespec_sec(&root_item.otime, 0);
+ btrfs_set_stack_timespec_sec(&root_item.ctime, 0);
free_extent_buffer(tmp);
location.objectid = objectid;