When using send/receive, it it useful to be able to match up source
subvols on the send side (as, say, for -p or -c clone sources) with their
corresponding copies on the receive side. This patch adds a -R option to
btrfs sub list to show the received subvolume UUID on the receive side,
allowing the user to perform that matching correctly.
Signed-off-by: Hugo Mills <h...@carfax.org.uk>
---
btrfs-list.c | 32 +++++++++++++++++++++++++++-----
btrfs-list.h | 2 ++
cmds-subvolume.c | 6 +++++-
3 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/btrfs-list.c b/btrfs-list.c
index 542dfe0..01ccca9 100644
--- a/btrfs-list.c
+++ b/btrfs-list.c
@@ -85,6 +85,11 @@ static struct {
.need_print = 0,
},
{
+ .name = "received_uuid",
+ .column_name = "Received UUID",
+ .need_print = 0,
+ },
+ {
.name = "uuid",
.column_name = "UUID",
.need_print = 0,
@@ -391,7 +396,7 @@ static struct root_info *root_tree_search(struct
root_lookup *root_tree,
static int update_root(struct root_lookup *root_lookup,
u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
- time_t ot, void *uuid, void *puuid)
+ time_t ot, void *uuid, void *puuid, void *ruuid)
{
struct root_info *ri;
@@ -429,6 +434,8 @@ static int update_root(struct root_lookup *root_lookup,
memcpy(&ri->uuid, uuid, BTRFS_UUID_SIZE);
if (puuid)
memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
+ if (ruuid)
+ memcpy(&ri->ruuid, ruuid, BTRFS_UUID_SIZE);
return 0;
}
@@ -447,17 +454,19 @@ static int update_root(struct root_lookup *root_lookup,
* ot: the original time(create time) of the root
* uuid: uuid of the root
* puuid: uuid of the root parent if any
+ * ruuid: uuid of the received subvol, if any
*/
static int add_root(struct root_lookup *root_lookup,
u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
- time_t ot, void *uuid, void *puuid)
+ time_t ot, void *uuid, void *puuid, void *ruuid)
{
struct root_info *ri;
int ret;
ret = update_root(root_lookup, root_id, ref_tree, root_offset, flags,
- dir_id, name, name_len, ogen, gen, ot, uuid, puuid);
+ dir_id, name, name_len, ogen, gen, ot,
+ uuid, puuid, ruuid);
if (!ret)
return 0;
@@ -501,6 +510,9 @@ static int add_root(struct root_lookup *root_lookup,
if (puuid)
memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
+ if (ruuid)
+ memcpy(&ri->ruuid, ruuid, BTRFS_UUID_SIZE);
+
ret = root_tree_insert(root_lookup, ri);
if (ret) {
printf("failed to insert tree %llu\n", (unsigned long
long)root_id);
@@ -978,6 +990,7 @@ static int __list_subvol_search(int fd, struct root_lookup
*root_lookup)
time_t t;
u8 uuid[BTRFS_UUID_SIZE];
u8 puuid[BTRFS_UUID_SIZE];
+ u8 ruuid[BTRFS_UUID_SIZE];
root_lookup_init(root_lookup);
memset(&args, 0, sizeof(args));
@@ -1030,7 +1043,7 @@ static int __list_subvol_search(int fd, struct
root_lookup *root_lookup)
add_root(root_lookup, sh.objectid, sh.offset,
0, 0, dir_id, name, name_len, 0, 0, 0,
- NULL, NULL);
+ NULL, NULL, NULL);
} else if (sh.type == BTRFS_ROOT_ITEM_KEY) {
ri = (struct btrfs_root_item *)(args.buf + off);
gen = btrfs_root_generation(ri);
@@ -1041,16 +1054,18 @@ static int __list_subvol_search(int fd, struct
root_lookup *root_lookup)
ogen = btrfs_root_otransid(ri);
memcpy(uuid, ri->uuid, BTRFS_UUID_SIZE);
memcpy(puuid, ri->parent_uuid,
BTRFS_UUID_SIZE);
+ memcpy(ruuid, ri->received_uuid,
BTRFS_UUID_SIZE);
} else {
t = 0;
ogen = 0;
memset(uuid, 0, BTRFS_UUID_SIZE);
memset(puuid, 0, BTRFS_UUID_SIZE);
+ memset(ruuid, 0, BTRFS_UUID_SIZE);
}
add_root(root_lookup, sh.objectid, 0,
sh.offset, flags, 0, NULL, 0, ogen,
- gen, t, uuid, puuid);
+ gen, t, uuid, puuid, ruuid);
}
off += sh.len;
@@ -1361,6 +1376,13 @@ static void print_subvolume_column(struct root_info
*subv,
uuid_unparse(subv->puuid, uuidparse);
printf("%s", uuidparse);
break;
+ case BTRFS_LIST_RUUID:
+ if (uuid_is_null(subv->ruuid))
+ strcpy(uuidparse, "-");
+ else
+ uuid_unparse(subv->ruuid, uuidparse);
+ printf("%s", uuidparse);
+ break;
case BTRFS_LIST_PATH:
BUG_ON(!subv->full_path);
printf("%s", subv->full_path);
diff --git a/btrfs-list.h b/btrfs-list.h
index 8ead9da..ee2aea5 100644
--- a/btrfs-list.h
+++ b/btrfs-list.h
@@ -61,6 +61,7 @@ struct root_info {
u8 uuid[BTRFS_UUID_SIZE];
u8 puuid[BTRFS_UUID_SIZE];
+ u8 ruuid[BTRFS_UUID_SIZE];
/* path from the subvol we live in to this root, including the
* root's name. This is null until we do the extra lookup ioctl.
@@ -110,6 +111,7 @@ enum btrfs_list_column_enum {
BTRFS_LIST_TOP_LEVEL,
BTRFS_LIST_OTIME,
BTRFS_LIST_PUUID,
+ BTRFS_LIST_RUUID,
BTRFS_LIST_UUID,
BTRFS_LIST_PATH,
BTRFS_LIST_ALL,
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 5e821c7..5216e53 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -393,6 +393,7 @@ static const char * const cmd_subvol_list_usage[] = {
"-o print only subvolumes bellow specified path",
"-u print the uuid of subvolumes (and snapshots)",
"-q print the parent uuid of the snapshots",
+ "-R print the uuid of the received snapshots",
"-t print the result as a table",
"-s list snapshots only in the filesystem",
"-r list readonly subvolumes (including snapshots)",
@@ -435,7 +436,7 @@ static int cmd_subvol_list(int argc, char **argv)
optind = 1;
while(1) {
c = getopt_long(argc, argv,
- "acdgopqsurG:C:t", long_options, NULL);
+ "acdgopqsurRG:C:t", long_options, NULL);
if (c < 0)
break;
@@ -476,6 +477,9 @@ static int cmd_subvol_list(int argc, char **argv)
case 'q':
btrfs_list_setup_print_column(BTRFS_LIST_PUUID);
break;
+ case 'R':
+ btrfs_list_setup_print_column(BTRFS_LIST_RUUID);
+ break;
case 'r':
flags |= BTRFS_ROOT_SUBVOL_RDONLY;
break;
--
2.0.1
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