[v3,08/10] btrfs-progs: undelete-subvol: add undelete-subvol subcommand
diff mbox

Message ID 20180507031033.4125-9-lufq.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Lu Fengqi May 7, 2018, 3:10 a.m. UTC
Add the undelete-subvol subcommand for btrfs rescue. This subcommand is
used to recover deleted subvolume left intact on the device.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
V3: remove OPEN_CTREE_PARTIAL flag.
V2: add -s option to specify subvol_id.

 cmds-rescue.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

Patch
diff mbox

diff --git a/cmds-rescue.c b/cmds-rescue.c
index c40088ad374e..536d6b37ac50 100644
--- a/cmds-rescue.c
+++ b/cmds-rescue.c
@@ -25,6 +25,7 @@ 
 #include "disk-io.h"
 #include "commands.h"
 #include "utils.h"
+#include "undelete-subvol.h"
 #include "help.h"
 
 static const char * const rescue_cmd_group_usage[] = {
@@ -248,6 +249,72 @@  out:
 	return !!ret;
 }
 
+static const char * const cmd_rescue_undelete_subvol_usage[] = {
+	"btrfs rescue undelete-subvol [-s <subvolid>] <device>",
+	"Undelete deleted subvolume",
+	"All deleted subvolume that still left intact on the device will be",
+	"recovered. If -s <subvolid> option is given, then just recover the",
+	"subvolume which specified by <subvolid>.",
+	"",
+	"-s <subvolid>	specify the subvolume which will be recovered.",
+	NULL
+};
+
+static int cmd_rescue_undelete_subvol(int argc, char **argv)
+{
+	struct btrfs_fs_info *fs_info;
+	char *devname;
+	u64 subvol_id = 0;
+	int ret;
+
+	while (1) {
+		int c = getopt(argc, argv, "s:");
+
+		if (c < 0)
+			break;
+		switch (c) {
+		case 's':
+			subvol_id = arg_strtou64(optarg);
+			if (!is_fstree(subvol_id)) {
+				error("%llu is not a valid subvolume id",
+						subvol_id);
+				ret = -EINVAL;
+				goto out;
+			}
+			break;
+		default:
+			usage(cmd_rescue_undelete_subvol_usage);
+		}
+	}
+
+	if (check_argc_exact(argc - optind, 1))
+		usage(cmd_rescue_undelete_subvol_usage);
+
+	devname = argv[optind];
+	ret = check_mounted(devname);
+	if (ret < 0) {
+		error("could not check mount status: %s", strerror(-ret));
+		goto out;
+	} else if (ret) {
+		error("%s is currently mounted", devname);
+		ret = -EBUSY;
+		goto out;
+	}
+
+	fs_info = open_ctree_fs_info(devname, 0, 0, 0, OPEN_CTREE_WRITES);
+	if (!fs_info) {
+		error("could not open btrfs");
+		ret = -EIO;
+		goto out;
+	}
+
+	ret = btrfs_undelete_subvols(fs_info, subvol_id);
+
+	close_ctree(fs_info->tree_root);
+out:
+	return ret;
+}
+
 static const char rescue_cmd_group_info[] =
 "toolbox for specific rescue operations";
 
@@ -260,6 +327,8 @@  const struct cmd_group rescue_cmd_group = {
 		{ "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
 		{ "fix-device-size", cmd_rescue_fix_device_size,
 			cmd_rescue_fix_device_size_usage, NULL, 0},
+		{ "undelete-subvol", cmd_rescue_undelete_subvol,
+			cmd_rescue_undelete_subvol_usage, NULL, 0},
 		NULL_CMD_STRUCT
 	}
 };