From: Josef Bacik <josef@xxxxxxxxxx>
If the normal fs tree is hosed and the user has multiple subvolumes it's handy
to be able to specify just one of the subvolumes to restore. It's also handy if
a user only wants to restore say /home instead of his entire disk. Thanks,
Signed-off-by: Josef Bacik <josef@xxxxxxxxxx>
---
cmds-restore.c | 32 ++++++++++++++++++++++++++++----
1 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/cmds-restore.c b/cmds-restore.c
index 4a14f93..467e5ef 100644
--- a/cmds-restore.c
+++ b/cmds-restore.c
@@ -773,13 +773,14 @@ int cmd_restore(int argc, char **argv)
char dir_name[128];
u64 tree_location = 0;
u64 fs_location = 0;
+ u64 root_objectid = 0;
int len;
int ret;
int opt;
int super_mirror = 0;
int find_dir = 0;
- while ((opt = getopt(argc, argv, "sviot:u:df:")) != -1) {
+ while ((opt = getopt(argc, argv, "sviot:u:df:r:")) != -1) {
switch (opt) {
case 's':
get_snaps = 1;
@@ -822,6 +823,14 @@ int cmd_restore(int argc, char **argv)
case 'd':
find_dir = 1;
break;
+ case 'r':
+ errno = 0;
+ root_objectid = (u64)strtoll(optarg, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "Root objectid not valid\n");
+ exit(1);
+ }
+ break;
default:
usage(cmd_restore_usage);
}
@@ -852,8 +861,6 @@ int cmd_restore(int argc, char **argv)
}
}
- printf("Root objectid is %Lu\n", root->objectid);
-
memset(path_name, 0, 4096);
strncpy(dir_name, argv[optind + 1], sizeof dir_name);
@@ -865,6 +872,23 @@ int cmd_restore(int argc, char **argv)
dir_name[len] = '\0';
}
+ if (root_objectid != 0) {
+ struct btrfs_root *orig_root = root;
+
+ key.objectid = root_objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ root = btrfs_read_fs_root(orig_root->fs_info, &key);
+ if (IS_ERR(root)) {
+ fprintf(stderr, "Error reading root\n");
+ root = orig_root;
+ ret = 1;
+ goto out;
+ }
+ key.type = 0;
+ key.offset = 0;
+ }
+
if (find_dir) {
ret = find_first_dir(root, &key.objectid);
if (ret)
@@ -873,7 +897,7 @@ int cmd_restore(int argc, char **argv)
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
}
- ret = search_dir(root->fs_info->fs_root, &key, dir_name);
+ ret = search_dir(root, &key, dir_name);
out:
close_ctree(root);
--
1.7.7.6
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