diff options
Diffstat (limited to 'cmds-rescue.c')
-rw-r--r-- | cmds-rescue.c | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/cmds-rescue.c b/cmds-rescue.c index ebe1dda3..64193678 100644 --- 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 +152,61 @@ 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; +} + const struct cmd_group rescue_cmd_group = { rescue_cmd_group_usage, NULL, { { "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 } }; |