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Btrfs-progs: add an option for specifying the root to restore

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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@redhat.com>
This commit is contained in:
Josef Bacik 2013-03-12 13:38:08 -04:00 committed by David Sterba
parent 572343ae26
commit 331295de05
1 changed files with 28 additions and 4 deletions
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32
cmds-restore.c
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@ -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);