btrfs-progs: alias btrfs device delete to btrfs device remove

[platform/upstream/btrfs-progs.git] / cmds-rescue.c

diff --git a/cmds-rescue.c b/cmds-rescue.c
index ebe1dda..a82da16 100644 (file)
--- a/cmds-rescue.c
+++ b/cmds-rescue.c
@@ -19,6 +19,9 @@
 #include "kerncompat.h"
 
 #include <getopt.h>
+#include "ctree.h"
+#include "transaction.h"
+#include "disk-io.h"
 #include "commands.h"
 #include "utils.h"
 
@@ -149,11 +152,64 @@ int cmd_super_recover(int argc, char **argv)
        return ret;
 }
 
+const char * const cmd_rescue_zero_log_usage[] = {
+       "btrfs rescue zero-log <device>",
+       "Clear the tree log. Usable if it's corrupted and prevents mount.",
+       "",
+       NULL
+};
+
+int cmd_rescue_zero_log(int argc, char **argv)
+{
+       struct btrfs_root *root;
+       struct btrfs_trans_handle *trans;
+       struct btrfs_super_block *sb;
+       char *devname;
+       int ret;
+
+       if (check_argc_exact(argc, 2))
+               usage(cmd_rescue_zero_log_usage);
+
+       devname = argv[optind];
+       ret = check_mounted(devname);
+       if (ret < 0) {
+               fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret));
+               goto out;
+       } else if (ret) {
+               fprintf(stderr, "%s is currently mounted. Aborting.\n", devname);
+               ret = -EBUSY;
+       }
+
+       root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
+       if (!root) {
+               fprintf(stderr, "Could not open ctree\n");
+               return 1;
+       }
+
+       sb = root->fs_info->super_copy;
+       printf("Clearing log on %s, previous log_root %llu, level %u\n",
+                       devname,
+                       (unsigned long long)btrfs_super_log_root(sb),
+                       (unsigned)btrfs_super_log_root_level(sb));
+       trans = btrfs_start_transaction(root, 1);
+       btrfs_set_super_log_root(sb, 0);
+       btrfs_set_super_log_root_level(sb, 0);
+       btrfs_commit_transaction(trans, root);
+       close_ctree(root);
+
+out:
+       return !!ret;
+}
+
+static const char rescue_cmd_group_info[] =
+"toolbox for specific rescue operations";
+
 const struct cmd_group rescue_cmd_group = {
-       rescue_cmd_group_usage, NULL, {
+       rescue_cmd_group_usage, rescue_cmd_group_info, {
                { "chunk-recover", cmd_chunk_recover, cmd_chunk_recover_usage, NULL, 0},
                { "super-recover", cmd_super_recover, cmd_super_recover_usage, NULL, 0},
-               { 0, 0, 0, 0, 0 }
+               { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
+               NULL_CMD_STRUCT
        }
 };