| /* |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/ioctl.h> |
| #include <errno.h> |
| #include <sys/stat.h> |
| #include <sys/vfs.h> |
| #include <libgen.h> |
| #include <limits.h> |
| #include <getopt.h> |
| #include <uuid/uuid.h> |
| #include <linux/magic.h> |
| |
| #include "kerncompat.h" |
| #include "ioctl.h" |
| #include "qgroup.h" |
| |
| #include "ctree.h" |
| #include "commands.h" |
| #include "utils.h" |
| #include "btrfs-list.h" |
| #include "utils.h" |
| #include "help.h" |
| |
| static int is_subvolume_cleaned(int fd, u64 subvolid) |
| { |
| int ret; |
| struct btrfs_ioctl_search_args args; |
| struct btrfs_ioctl_search_key *sk = &args.key; |
| |
| sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; |
| sk->min_objectid = subvolid; |
| sk->max_objectid = subvolid; |
| sk->min_type = BTRFS_ROOT_ITEM_KEY; |
| sk->max_type = BTRFS_ROOT_ITEM_KEY; |
| sk->min_offset = 0; |
| sk->max_offset = (u64)-1; |
| sk->min_transid = 0; |
| sk->max_transid = (u64)-1; |
| sk->nr_items = 1; |
| |
| ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); |
| if (ret < 0) |
| return -errno; |
| |
| if (sk->nr_items == 0) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int wait_for_subvolume_cleaning(int fd, int count, u64 *ids, |
| int sleep_interval) |
| { |
| int ret; |
| int i; |
| |
| while (1) { |
| int clean = 1; |
| |
| for (i = 0; i < count; i++) { |
| if (!ids[i]) |
| continue; |
| ret = is_subvolume_cleaned(fd, ids[i]); |
| if (ret < 0) { |
| error( |
| "cannot read status of dead subvolume %llu: %s", |
| (unsigned long long)ids[i], strerror(-ret)); |
| return ret; |
| } |
| if (ret) { |
| printf("Subvolume id %llu is gone\n", ids[i]); |
| ids[i] = 0; |
| } else { |
| clean = 0; |
| } |
| } |
| if (clean) |
| break; |
| sleep(sleep_interval); |
| } |
| |
| return 0; |
| } |
| |
| static const char * const subvolume_cmd_group_usage[] = { |
| "btrfs subvolume <command> <args>", |
| NULL |
| }; |
| |
| static const char * const cmd_subvol_create_usage[] = { |
| "btrfs subvolume create [-i <qgroupid>] [<dest>/]<name>", |
| "Create a subvolume", |
| "Create a subvolume <name> in <dest>. If <dest> is not given", |
| "subvolume <name> will be created in the current directory.", |
| "", |
| "-i <qgroupid> add the newly created subvolume to a qgroup. This", |
| " option can be given multiple times.", |
| NULL |
| }; |
| |
| static int cmd_subvol_create(int argc, char **argv) |
| { |
| int retval, res, len; |
| int fddst = -1; |
| char *dupname = NULL; |
| char *dupdir = NULL; |
| char *newname; |
| char *dstdir; |
| char *dst; |
| struct btrfs_qgroup_inherit *inherit = NULL; |
| DIR *dirstream = NULL; |
| |
| while (1) { |
| int c = getopt(argc, argv, "c:i:"); |
| if (c < 0) |
| break; |
| |
| switch (c) { |
| case 'c': |
| res = qgroup_inherit_add_copy(&inherit, optarg, 0); |
| if (res) { |
| retval = res; |
| goto out; |
| } |
| break; |
| case 'i': |
| res = qgroup_inherit_add_group(&inherit, optarg); |
| if (res) { |
| retval = res; |
| goto out; |
| } |
| break; |
| default: |
| usage(cmd_subvol_create_usage); |
| } |
| } |
| |
| if (check_argc_exact(argc - optind, 1)) |
| usage(cmd_subvol_create_usage); |
| |
| dst = argv[optind]; |
| |
| retval = 1; /* failure */ |
| res = test_isdir(dst); |
| if (res < 0 && res != -ENOENT) { |
| error("cannot access %s: %s", dst, strerror(-res)); |
| goto out; |
| } |
| if (res >= 0) { |
| error("target path already exists: %s", dst); |
| goto out; |
| } |
| |
| dupname = strdup(dst); |
| newname = basename(dupname); |
| dupdir = strdup(dst); |
| dstdir = dirname(dupdir); |
| |
| if (!test_issubvolname(newname)) { |
| error("invalid subvolume name: %s", newname); |
| goto out; |
| } |
| |
| len = strlen(newname); |
| if (len == 0 || len >= BTRFS_VOL_NAME_MAX) { |
| error("subvolume name too long: %s", newname); |
| goto out; |
| } |
| |
| fddst = btrfs_open_dir(dstdir, &dirstream, 1); |
| if (fddst < 0) |
| goto out; |
| |
| printf("Create subvolume '%s/%s'\n", dstdir, newname); |
| if (inherit) { |
| struct btrfs_ioctl_vol_args_v2 args; |
| |
| memset(&args, 0, sizeof(args)); |
| strncpy_null(args.name, newname); |
| args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT; |
| args.size = qgroup_inherit_size(inherit); |
| args.qgroup_inherit = inherit; |
| |
| res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE_V2, &args); |
| } else { |
| struct btrfs_ioctl_vol_args args; |
| |
| memset(&args, 0, sizeof(args)); |
| strncpy_null(args.name, newname); |
| |
| res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args); |
| } |
| |
| if (res < 0) { |
| error("cannot create subvolume: %s", strerror(errno)); |
| goto out; |
| } |
| |
| retval = 0; /* success */ |
| out: |
| close_file_or_dir(fddst, dirstream); |
| free(inherit); |
| free(dupname); |
| free(dupdir); |
| |
| return retval; |
| } |
| |
| static int wait_for_commit(int fd) |
| { |
| int ret; |
| |
| ret = ioctl(fd, BTRFS_IOC_START_SYNC, NULL); |
| if (ret < 0) |
| return ret; |
| return ioctl(fd, BTRFS_IOC_WAIT_SYNC, NULL); |
| } |
| |
| static const char * const cmd_subvol_delete_usage[] = { |
| "btrfs subvolume delete [options] <subvolume> [<subvolume>...]", |
| "Delete subvolume(s)", |
| "Delete subvolumes from the filesystem. The corresponding directory", |
| "is removed instantly but the data blocks are removed later.", |
| "The deletion does not involve full commit by default due to", |
| "performance reasons (as a consequence, the subvolume may appear again", |
| "after a crash). Use one of the --commit options to wait until the", |
| "operation is safely stored on the media.", |
| "", |
| "-c|--commit-after wait for transaction commit at the end of the operation", |
| "-C|--commit-each wait for transaction commit after deleting each subvolume", |
| "-v|--verbose verbose output of operations", |
| NULL |
| }; |
| |
| static int cmd_subvol_delete(int argc, char **argv) |
| { |
| int res, ret = 0; |
| int cnt; |
| int fd = -1; |
| struct btrfs_ioctl_vol_args args; |
| char *dname, *vname, *cpath; |
| char *dupdname = NULL; |
| char *dupvname = NULL; |
| char *path; |
| DIR *dirstream = NULL; |
| int verbose = 0; |
| int commit_mode = 0; |
| |
| while (1) { |
| int c; |
| static const struct option long_options[] = { |
| {"commit-after", no_argument, NULL, 'c'}, /* commit mode 1 */ |
| {"commit-each", no_argument, NULL, 'C'}, /* commit mode 2 */ |
| {"verbose", no_argument, NULL, 'v'}, |
| {NULL, 0, NULL, 0} |
| }; |
| |
| c = getopt_long(argc, argv, "cCv", long_options, NULL); |
| if (c < 0) |
| break; |
| |
| switch(c) { |
| case 'c': |
| commit_mode = 1; |
| break; |
| case 'C': |
| commit_mode = 2; |
| break; |
| case 'v': |
| verbose++; |
| break; |
| default: |
| usage(cmd_subvol_delete_usage); |
| } |
| } |
| |
| if (check_argc_min(argc - optind, 1)) |
| usage(cmd_subvol_delete_usage); |
| |
| if (verbose > 0) { |
| printf("Transaction commit: %s\n", |
| !commit_mode ? "none (default)" : |
| commit_mode == 1 ? "at the end" : "after each"); |
| } |
| |
| cnt = optind; |
| |
| again: |
| path = argv[cnt]; |
| |
| res = test_issubvolume(path); |
| if (res < 0) { |
| error("cannot access subvolume %s: %s", path, strerror(-res)); |
| ret = 1; |
| goto out; |
| } |
| if (!res) { |
| error("not a subvolume: %s", path); |
| ret = 1; |
| goto out; |
| } |
| |
| cpath = realpath(path, NULL); |
| if (!cpath) { |
| ret = errno; |
| error("cannot find real path for '%s': %s", |
| path, strerror(errno)); |
| goto out; |
| } |
| dupdname = strdup(cpath); |
| dname = dirname(dupdname); |
| dupvname = strdup(cpath); |
| vname = basename(dupvname); |
| free(cpath); |
| |
| fd = btrfs_open_dir(dname, &dirstream, 1); |
| if (fd < 0) { |
| ret = 1; |
| goto out; |
| } |
| |
| printf("Delete subvolume (%s): '%s/%s'\n", |
| commit_mode == 2 || (commit_mode == 1 && cnt + 1 == argc) |
| ? "commit" : "no-commit", dname, vname); |
| memset(&args, 0, sizeof(args)); |
| strncpy_null(args.name, vname); |
| res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args); |
| if(res < 0 ){ |
| error("cannot delete '%s/%s': %s", dname, vname, |
| strerror(errno)); |
| ret = 1; |
| goto out; |
| } |
| |
| if (commit_mode == 1) { |
| res = wait_for_commit(fd); |
| if (res < 0) { |
| error("unable to wait for commit after '%s': %s", |
| path, strerror(errno)); |
| ret = 1; |
| } |
| } |
| |
| out: |
| free(dupdname); |
| free(dupvname); |
| dupdname = NULL; |
| dupvname = NULL; |
| cnt++; |
| if (cnt < argc) { |
| close_file_or_dir(fd, dirstream); |
| /* avoid double free */ |
| fd = -1; |
| dirstream = NULL; |
| goto again; |
| } |
| |
| if (commit_mode == 2 && fd != -1) { |
| res = wait_for_commit(fd); |
| if (res < 0) { |
| error("unable to do final sync after deletion: %s", |
| strerror(errno)); |
| ret = 1; |
| } |
| } |
| close_file_or_dir(fd, dirstream); |
| |
| return ret; |
| } |
| |
| /* |
| * Naming of options: |
| * - uppercase for filters and sort options |
| * - lowercase for enabling specific items in the output |
| */ |
| static const char * const cmd_subvol_list_usage[] = { |
| "btrfs subvolume list [options] [-G [+|-]value] [-C [+|-]value] " |
| "[--sort=gen,ogen,rootid,path] <path>", |
| "List subvolumes (and snapshots)", |
| "", |
| "-p print parent ID", |
| "-a print all the subvolumes in the filesystem and", |
| " distinguish absolute and relative path with respect", |
| " to the given <path>", |
| "-c print the ogeneration of the subvolume", |
| "-g print the generation of the subvolume", |
| "-o print only subvolumes below specified path", |
| "-u print the uuid of subvolumes (and snapshots)", |
| "-q print the parent uuid of the snapshots", |
| "-R print the uuid of the received snapshots", |
| "-t print the result as a table", |
| "-s list snapshots only in the filesystem", |
| "-r list readonly subvolumes (including snapshots)", |
| "-d list deleted subvolumes that are not yet cleaned", |
| "-G [+|-]value", |
| " filter the subvolumes by generation", |
| " (+value: >= value; -value: <= value; value: = value)", |
| "-C [+|-]value", |
| " filter the subvolumes by ogeneration", |
| " (+value: >= value; -value: <= value; value: = value)", |
| "--sort=gen,ogen,rootid,path", |
| " list the subvolume in order of gen, ogen, rootid or path", |
| " you also can add '+' or '-' in front of each items.", |
| " (+:ascending, -:descending, ascending default)", |
| NULL, |
| }; |
| |
| static int cmd_subvol_list(int argc, char **argv) |
| { |
| struct btrfs_list_filter_set *filter_set; |
| struct btrfs_list_comparer_set *comparer_set; |
| u64 flags = 0; |
| int fd = -1; |
| u64 top_id; |
| int ret = -1, uerr = 0; |
| char *subvol; |
| int is_list_all = 0; |
| int is_only_in_path = 0; |
| DIR *dirstream = NULL; |
| enum btrfs_list_layout layout = BTRFS_LIST_LAYOUT_DEFAULT; |
| |
| filter_set = btrfs_list_alloc_filter_set(); |
| comparer_set = btrfs_list_alloc_comparer_set(); |
| |
| while(1) { |
| int c; |
| static const struct option long_options[] = { |
| {"sort", required_argument, NULL, 'S'}, |
| {NULL, 0, NULL, 0} |
| }; |
| |
| c = getopt_long(argc, argv, |
| "acdgopqsurRG:C:t", long_options, NULL); |
| if (c < 0) |
| break; |
| |
| switch(c) { |
| case 'p': |
| btrfs_list_setup_print_column(BTRFS_LIST_PARENT); |
| break; |
| case 'a': |
| is_list_all = 1; |
| break; |
| case 'c': |
| btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION); |
| break; |
| case 'd': |
| btrfs_list_setup_filter(&filter_set, |
| BTRFS_LIST_FILTER_DELETED, |
| 0); |
| break; |
| case 'g': |
| btrfs_list_setup_print_column(BTRFS_LIST_GENERATION); |
| break; |
| case 'o': |
| is_only_in_path = 1; |
| break; |
| case 't': |
| layout = BTRFS_LIST_LAYOUT_TABLE; |
| break; |
| case 's': |
| btrfs_list_setup_filter(&filter_set, |
| BTRFS_LIST_FILTER_SNAPSHOT_ONLY, |
| 0); |
| btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION); |
| btrfs_list_setup_print_column(BTRFS_LIST_OTIME); |
| break; |
| case 'u': |
| btrfs_list_setup_print_column(BTRFS_LIST_UUID); |
| break; |
| case 'q': |
| btrfs_list_setup_print_column(BTRFS_LIST_PUUID); |
| break; |
| case 'R': |
| btrfs_list_setup_print_column(BTRFS_LIST_RUUID); |
| break; |
| case 'r': |
| flags |= BTRFS_ROOT_SUBVOL_RDONLY; |
| break; |
| case 'G': |
| btrfs_list_setup_print_column(BTRFS_LIST_GENERATION); |
| ret = btrfs_list_parse_filter_string(optarg, |
| &filter_set, |
| BTRFS_LIST_FILTER_GEN); |
| if (ret) { |
| uerr = 1; |
| goto out; |
| } |
| break; |
| |
| case 'C': |
| btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION); |
| ret = btrfs_list_parse_filter_string(optarg, |
| &filter_set, |
| BTRFS_LIST_FILTER_CGEN); |
| if (ret) { |
| uerr = 1; |
| goto out; |
| } |
| break; |
| case 'S': |
| ret = btrfs_list_parse_sort_string(optarg, |
| &comparer_set); |
| if (ret) { |
| uerr = 1; |
| goto out; |
| } |
| break; |
| |
| default: |
| uerr = 1; |
| goto out; |
| } |
| } |
| |
| if (check_argc_exact(argc - optind, 1)) { |
| uerr = 1; |
| goto out; |
| } |
| |
| subvol = argv[optind]; |
| fd = btrfs_open_dir(subvol, &dirstream, 1); |
| if (fd < 0) { |
| ret = -1; |
| error("can't access '%s'", subvol); |
| goto out; |
| } |
| |
| if (flags) |
| btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_FLAGS, |
| flags); |
| |
| ret = btrfs_list_get_path_rootid(fd, &top_id); |
| if (ret) |
| goto out; |
| |
| if (is_list_all) |
| btrfs_list_setup_filter(&filter_set, |
| BTRFS_LIST_FILTER_FULL_PATH, |
| top_id); |
| else if (is_only_in_path) |
| btrfs_list_setup_filter(&filter_set, |
| BTRFS_LIST_FILTER_TOPID_EQUAL, |
| top_id); |
| |
| /* by default we shall print the following columns*/ |
| btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID); |
| btrfs_list_setup_print_column(BTRFS_LIST_GENERATION); |
| btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL); |
| btrfs_list_setup_print_column(BTRFS_LIST_PATH); |
| |
| ret = btrfs_list_subvols_print(fd, filter_set, comparer_set, |
| layout, !is_list_all && !is_only_in_path, NULL); |
| |
| out: |
| close_file_or_dir(fd, dirstream); |
| if (filter_set) |
| free(filter_set); |
| if (comparer_set) |
| free(comparer_set); |
| if (uerr) |
| usage(cmd_subvol_list_usage); |
| return !!ret; |
| } |
| |
| static const char * const cmd_subvol_snapshot_usage[] = { |
| "btrfs subvolume snapshot [-r] [-i <qgroupid>] <source> <dest>|[<dest>/]<name>", |
| "Create a snapshot of the subvolume", |
| "Create a writable/readonly snapshot of the subvolume <source> with", |
| "the name <name> in the <dest> directory. If only <dest> is given,", |
| "the subvolume will be named the basename of <source>.", |
| "", |
| "-r create a readonly snapshot", |
| "-i <qgroupid> add the newly created snapshot to a qgroup. This", |
| " option can be given multiple times.", |
| NULL |
| }; |
| |
| static int cmd_subvol_snapshot(int argc, char **argv) |
| { |
| char *subvol, *dst; |
| int res, retval; |
| int fd = -1, fddst = -1; |
| int len, readonly = 0; |
| char *dupname = NULL; |
| char *dupdir = NULL; |
| char *newname; |
| char *dstdir; |
| struct btrfs_ioctl_vol_args_v2 args; |
| struct btrfs_qgroup_inherit *inherit = NULL; |
| DIR *dirstream1 = NULL, *dirstream2 = NULL; |
| |
| memset(&args, 0, sizeof(args)); |
| while (1) { |
| int c = getopt(argc, argv, "c:i:r"); |
| if (c < 0) |
| break; |
| |
| switch (c) { |
| case 'c': |
| res = qgroup_inherit_add_copy(&inherit, optarg, 0); |
| if (res) { |
| retval = res; |
| goto out; |
| } |
| break; |
| case 'i': |
| res = qgroup_inherit_add_group(&inherit, optarg); |
| if (res) { |
| retval = res; |
| goto out; |
| } |
| break; |
| case 'r': |
| readonly = 1; |
| break; |
| case 'x': |
| res = qgroup_inherit_add_copy(&inherit, optarg, 1); |
| if (res) { |
| retval = res; |
| goto out; |
| } |
| break; |
| default: |
| usage(cmd_subvol_snapshot_usage); |
| } |
| } |
| |
| if (check_argc_exact(argc - optind, 2)) |
| usage(cmd_subvol_snapshot_usage); |
| |
| subvol = argv[optind]; |
| dst = argv[optind + 1]; |
| |
| retval = 1; /* failure */ |
| res = test_issubvolume(subvol); |
| if (res < 0) { |
| error("cannot access subvolume %s: %s", subvol, strerror(-res)); |
| goto out; |
| } |
| if (!res) { |
| error("not a subvolume: %s", subvol); |
| goto out; |
| } |
| |
| res = test_isdir(dst); |
| if (res < 0 && res != -ENOENT) { |
| error("cannot access %s: %s", dst, strerror(-res)); |
| goto out; |
| } |
| if (res == 0) { |
| error("'%s' exists and it is not a directory", dst); |
| goto out; |
| } |
| |
| if (res > 0) { |
| dupname = strdup(subvol); |
| newname = basename(dupname); |
| dstdir = dst; |
| } else { |
| dupname = strdup(dst); |
| newname = basename(dupname); |
| dupdir = strdup(dst); |
| dstdir = dirname(dupdir); |
| } |
| |
| if (!test_issubvolname(newname)) { |
| error("invalid snapshot name '%s'", newname); |
| goto out; |
| } |
| |
| len = strlen(newname); |
| if (len == 0 || len >= BTRFS_VOL_NAME_MAX) { |
| error("snapshot name too long '%s'", newname); |
| goto out; |
| } |
| |
| fddst = btrfs_open_dir(dstdir, &dirstream1, 1); |
| if (fddst < 0) |
| goto out; |
| |
| fd = btrfs_open_dir(subvol, &dirstream2, 1); |
| if (fd < 0) |
| goto out; |
| |
| if (readonly) { |
| args.flags |= BTRFS_SUBVOL_RDONLY; |
| printf("Create a readonly snapshot of '%s' in '%s/%s'\n", |
| subvol, dstdir, newname); |
| } else { |
| printf("Create a snapshot of '%s' in '%s/%s'\n", |
| subvol, dstdir, newname); |
| } |
| |
| args.fd = fd; |
| if (inherit) { |
| args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT; |
| args.size = qgroup_inherit_size(inherit); |
| args.qgroup_inherit = inherit; |
| } |
| strncpy_null(args.name, newname); |
| |
| res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args); |
| |
| if (res < 0) { |
| error("cannot snapshot '%s': %s", subvol, strerror(errno)); |
| goto out; |
| } |
| |
| retval = 0; /* success */ |
| |
| out: |
| close_file_or_dir(fddst, dirstream1); |
| close_file_or_dir(fd, dirstream2); |
| free(inherit); |
| free(dupname); |
| free(dupdir); |
| |
| return retval; |
| } |
| |
| static const char * const cmd_subvol_get_default_usage[] = { |
| "btrfs subvolume get-default <path>", |
| "Get the default subvolume of a filesystem", |
| NULL |
| }; |
| |
| static int cmd_subvol_get_default(int argc, char **argv) |
| { |
| int fd = -1; |
| int ret; |
| char *subvol; |
| struct btrfs_list_filter_set *filter_set; |
| u64 default_id; |
| DIR *dirstream = NULL; |
| |
| clean_args_no_options(argc, argv, cmd_subvol_get_default_usage); |
| |
| if (check_argc_exact(argc - optind, 1)) |
| usage(cmd_subvol_get_default_usage); |
| |
| subvol = argv[1]; |
| fd = btrfs_open_dir(subvol, &dirstream, 1); |
| if (fd < 0) |
| return 1; |
| |
| ret = btrfs_list_get_default_subvolume(fd, &default_id); |
| if (ret) { |
| error("failed to look up default subvolume: %s", |
| strerror(errno)); |
| goto out; |
| } |
| |
| ret = 1; |
| if (default_id == 0) { |
| error("'default' dir item not found"); |
| goto out; |
| } |
| |
| /* no need to resolve roots if FS_TREE is default */ |
| if (default_id == BTRFS_FS_TREE_OBJECTID) { |
| printf("ID 5 (FS_TREE)\n"); |
| ret = 0; |
| goto out; |
| } |
| |
| filter_set = btrfs_list_alloc_filter_set(); |
| btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_ROOTID, |
| default_id); |
| |
| /* by default we shall print the following columns*/ |
| btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID); |
| btrfs_list_setup_print_column(BTRFS_LIST_GENERATION); |
| btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL); |
| btrfs_list_setup_print_column(BTRFS_LIST_PATH); |
| |
| ret = btrfs_list_subvols_print(fd, filter_set, NULL, |
| BTRFS_LIST_LAYOUT_DEFAULT, 1, NULL); |
| |
| if (filter_set) |
| free(filter_set); |
| out: |
| close_file_or_dir(fd, dirstream); |
| return !!ret; |
| } |
| |
| static const char * const cmd_subvol_set_default_usage[] = { |
| "btrfs subvolume set-default <subvolid> <path>", |
| "Set the default subvolume of a filesystem", |
| NULL |
| }; |
| |
| static int cmd_subvol_set_default(int argc, char **argv) |
| { |
| int ret=0, fd, e; |
| u64 objectid; |
| char *path; |
| char *subvolid; |
| DIR *dirstream = NULL; |
| |
| clean_args_no_options(argc, argv, cmd_subvol_set_default_usage); |
| |
| if (check_argc_exact(argc - optind, 2)) |
| usage(cmd_subvol_set_default_usage); |
| |
| subvolid = argv[optind]; |
| path = argv[optind + 1]; |
| |
| objectid = arg_strtou64(subvolid); |
| |
| fd = btrfs_open_dir(path, &dirstream, 1); |
| if (fd < 0) |
| return 1; |
| |
| ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid); |
| e = errno; |
| close_file_or_dir(fd, dirstream); |
| if (ret < 0) { |
| error("unable to set a new default subvolume: %s", |
| strerror(e)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| static const char * const cmd_subvol_find_new_usage[] = { |
| "btrfs subvolume find-new <path> <lastgen>", |
| "List the recently modified files in a filesystem", |
| NULL |
| }; |
| |
| static int cmd_subvol_find_new(int argc, char **argv) |
| { |
| int fd; |
| int ret; |
| char *subvol; |
| u64 last_gen; |
| DIR *dirstream = NULL; |
| |
| clean_args_no_options(argc, argv, cmd_subvol_find_new_usage); |
| |
| if (check_argc_exact(argc - optind, 2)) |
| usage(cmd_subvol_find_new_usage); |
| |
| subvol = argv[optind]; |
| last_gen = arg_strtou64(argv[optind + 1]); |
| |
| ret = test_issubvolume(subvol); |
| if (ret < 0) { |
| error("cannot access subvolume %s: %s", subvol, strerror(-ret)); |
| return 1; |
| } |
| if (!ret) { |
| error("not a subvolume: %s", subvol); |
| return 1; |
| } |
| |
| fd = btrfs_open_dir(subvol, &dirstream, 1); |
| if (fd < 0) |
| return 1; |
| |
| ret = ioctl(fd, BTRFS_IOC_SYNC); |
| if (ret < 0) { |
| error("sync ioctl failed on '%s': %s", |
| subvol, strerror(errno)); |
| close_file_or_dir(fd, dirstream); |
| return 1; |
| } |
| |
| ret = btrfs_list_find_updated_files(fd, 0, last_gen); |
| close_file_or_dir(fd, dirstream); |
| return !!ret; |
| } |
| |
| static const char * const cmd_subvol_show_usage[] = { |
| "btrfs subvolume show <subvol-path>", |
| "Show more information of the subvolume", |
| NULL |
| }; |
| |
| static int cmd_subvol_show(int argc, char **argv) |
| { |
| struct root_info get_ri; |
| struct btrfs_list_filter_set *filter_set = NULL; |
| char tstr[256]; |
| char uuidparse[BTRFS_UUID_UNPARSED_SIZE]; |
| char *fullpath = NULL; |
| char raw_prefix[] = "\t\t\t\t"; |
| int fd = -1; |
| int ret = 1; |
| DIR *dirstream1 = NULL; |
| |
| clean_args_no_options(argc, argv, cmd_subvol_show_usage); |
| |
| if (check_argc_exact(argc - optind, 1)) |
| usage(cmd_subvol_show_usage); |
| |
| memset(&get_ri, 0, sizeof(get_ri)); |
| fullpath = realpath(argv[optind], NULL); |
| if (!fullpath) { |
| error("cannot find real path for '%s': %s", |
| argv[optind], strerror(errno)); |
| goto out; |
| } |
| |
| ret = get_subvol_info(fullpath, &get_ri); |
| if (ret) { |
| if (ret < 0) { |
| error("Failed to get subvol info %s: %s", |
| fullpath, strerror(-ret)); |
| } else { |
| error("Failed to get subvol info %s: %d", |
| fullpath, ret); |
| } |
| return ret; |
| } |
| |
| /* print the info */ |
| printf("%s\n", fullpath); |
| printf("\tName: \t\t\t%s\n", get_ri.name); |
| |
| if (uuid_is_null(get_ri.uuid)) |
| strcpy(uuidparse, "-"); |
| else |
| uuid_unparse(get_ri.uuid, uuidparse); |
| printf("\tUUID: \t\t\t%s\n", uuidparse); |
| |
| if (uuid_is_null(get_ri.puuid)) |
| strcpy(uuidparse, "-"); |
| else |
| uuid_unparse(get_ri.puuid, uuidparse); |
| printf("\tParent UUID: \t\t%s\n", uuidparse); |
| |
| if (uuid_is_null(get_ri.ruuid)) |
| strcpy(uuidparse, "-"); |
| else |
| uuid_unparse(get_ri.ruuid, uuidparse); |
| printf("\tReceived UUID: \t\t%s\n", uuidparse); |
| |
| if (get_ri.otime) { |
| struct tm tm; |
| |
| localtime_r(&get_ri.otime, &tm); |
| strftime(tstr, 256, "%Y-%m-%d %X %z", &tm); |
| } else |
| strcpy(tstr, "-"); |
| printf("\tCreation time: \t\t%s\n", tstr); |
| |
| printf("\tSubvolume ID: \t\t%llu\n", get_ri.root_id); |
| printf("\tGeneration: \t\t%llu\n", get_ri.gen); |
| printf("\tGen at creation: \t%llu\n", get_ri.ogen); |
| printf("\tParent ID: \t\t%llu\n", get_ri.ref_tree); |
| printf("\tTop level ID: \t\t%llu\n", get_ri.top_id); |
| |
| if (get_ri.flags & BTRFS_ROOT_SUBVOL_RDONLY) |
| printf("\tFlags: \t\t\treadonly\n"); |
| else |
| printf("\tFlags: \t\t\t-\n"); |
| |
| /* print the snapshots of the given subvol if any*/ |
| printf("\tSnapshot(s):\n"); |
| filter_set = btrfs_list_alloc_filter_set(); |
| btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_BY_PARENT, |
| (u64)(unsigned long)get_ri.uuid); |
| btrfs_list_setup_print_column(BTRFS_LIST_PATH); |
| |
| fd = open_file_or_dir(fullpath, &dirstream1); |
| if (fd < 0) { |
| fprintf(stderr, "ERROR: can't access '%s'\n", fullpath); |
| goto out; |
| } |
| btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW, |
| 1, raw_prefix); |
| |
| out: |
| /* clean up */ |
| free(get_ri.path); |
| free(get_ri.name); |
| free(get_ri.full_path); |
| free(filter_set); |
| |
| close_file_or_dir(fd, dirstream1); |
| free(fullpath); |
| return !!ret; |
| } |
| |
| static const char * const cmd_subvol_sync_usage[] = { |
| "btrfs subvolume sync <path> [<subvol-id>...]", |
| "Wait until given subvolume(s) are completely removed from the filesystem.", |
| "Wait until given subvolume(s) are completely removed from the filesystem", |
| "after deletion.", |
| "If no subvolume id is given, wait until all current deletion requests", |
| "are completed, but do not wait for subvolumes deleted meanwhile.", |
| "The status of subvolume ids is checked periodically.", |
| "", |
| "-s <N> sleep N seconds between checks (default: 1)", |
| NULL |
| }; |
| |
| #if 0 |
| /* |
| * If we're looking for any dead subvolume, take a shortcut and look |
| * for any ORPHAN_ITEMs in the tree root |
| */ |
| static int fs_has_dead_subvolumes(int fd) |
| { |
| int ret; |
| struct btrfs_ioctl_search_args args; |
| struct btrfs_ioctl_search_key *sk = &args.key; |
| struct btrfs_ioctl_search_header sh; |
| u64 min_subvolid = 0; |
| |
| again: |
| sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; |
| sk->min_objectid = BTRFS_ORPHAN_OBJECTID; |
| sk->max_objectid = BTRFS_ORPHAN_OBJECTID; |
| sk->min_type = BTRFS_ORPHAN_ITEM_KEY; |
| sk->max_type = BTRFS_ORPHAN_ITEM_KEY; |
| sk->min_offset = min_subvolid; |
| sk->max_offset = (u64)-1; |
| sk->min_transid = 0; |
| sk->max_transid = (u64)-1; |
| sk->nr_items = 1; |
| |
| ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); |
| if (ret < 0) |
| return -errno; |
| |
| if (!sk->nr_items) |
| return 0; |
| |
| memcpy(&sh, args.buf, sizeof(sh)); |
| min_subvolid = sh.offset; |
| |
| /* |
| * Verify that the root item is really there and we haven't hit |
| * a stale orphan |
| */ |
| sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; |
| sk->min_objectid = min_subvolid; |
| sk->max_objectid = min_subvolid; |
| sk->min_type = BTRFS_ROOT_ITEM_KEY; |
| sk->max_type = BTRFS_ROOT_ITEM_KEY; |
| sk->min_offset = 0; |
| sk->max_offset = (u64)-1; |
| sk->min_transid = 0; |
| sk->max_transid = (u64)-1; |
| sk->nr_items = 1; |
| |
| ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); |
| if (ret < 0) |
| return -errno; |
| |
| /* |
| * Stale orphan, try the next one |
| */ |
| if (!sk->nr_items) { |
| min_subvolid++; |
| goto again; |
| } |
| |
| return 1; |
| } |
| #endif |
| |
| #define SUBVOL_ID_BATCH 1024 |
| |
| /* |
| * Enumerate all dead subvolumes that exist in the filesystem. |
| * Fill @ids and reallocate to bigger size if needed. |
| */ |
| static int enumerate_dead_subvols(int fd, u64 **ids) |
| { |
| int ret; |
| struct btrfs_ioctl_search_args args; |
| struct btrfs_ioctl_search_key *sk = &args.key; |
| int idx = 0; |
| int count = 0; |
| |
| memset(&args, 0, sizeof(args)); |
| |
| sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; |
| sk->min_objectid = BTRFS_ORPHAN_OBJECTID; |
| sk->max_objectid = BTRFS_ORPHAN_OBJECTID; |
| sk->min_type = BTRFS_ORPHAN_ITEM_KEY; |
| sk->max_type = BTRFS_ORPHAN_ITEM_KEY; |
| sk->min_offset = 0; |
| sk->max_offset = (u64)-1; |
| sk->min_transid = 0; |
| sk->max_transid = (u64)-1; |
| sk->nr_items = 4096; |
| |
| *ids = NULL; |
| while (1) { |
| struct btrfs_ioctl_search_header *sh; |
| unsigned long off; |
| int i; |
| |
| ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); |
| if (ret < 0) |
| return -errno; |
| |
| if (!sk->nr_items) |
| return idx; |
| |
| off = 0; |
| for (i = 0; i < sk->nr_items; i++) { |
| sh = (struct btrfs_ioctl_search_header*)(args.buf + off); |
| off += sizeof(*sh); |
| |
| if (btrfs_search_header_type(sh) |
| == BTRFS_ORPHAN_ITEM_KEY) { |
| if (idx >= count) { |
| u64 *newids; |
| |
| count += SUBVOL_ID_BATCH; |
| newids = (u64*)realloc(*ids, |
| count * sizeof(u64)); |
| if (!newids) |
| return -ENOMEM; |
| *ids = newids; |
| } |
| (*ids)[idx] = btrfs_search_header_offset(sh); |
| idx++; |
| } |
| off += btrfs_search_header_len(sh); |
| |
| sk->min_objectid = btrfs_search_header_objectid(sh); |
| sk->min_type = btrfs_search_header_type(sh); |
| sk->min_offset = btrfs_search_header_offset(sh); |
| } |
| if (sk->min_offset < (u64)-1) |
| sk->min_offset++; |
| else |
| break; |
| if (sk->min_type != BTRFS_ORPHAN_ITEM_KEY) |
| break; |
| if (sk->min_objectid != BTRFS_ORPHAN_OBJECTID) |
| break; |
| } |
| |
| return idx; |
| } |
| |
| static int cmd_subvol_sync(int argc, char **argv) |
| { |
| int fd = -1; |
| int i; |
| int ret = 1; |
| DIR *dirstream = NULL; |
| u64 *ids = NULL; |
| int id_count; |
| int sleep_interval = 1; |
| |
| while (1) { |
| int c = getopt(argc, argv, "s:"); |
| |
| if (c < 0) |
| break; |
| |
| switch (c) { |
| case 's': |
| sleep_interval = atoi(optarg); |
| if (sleep_interval < 1) { |
| error("invalid sleep interval %s", optarg); |
| ret = 1; |
| goto out; |
| } |
| break; |
| default: |
| usage(cmd_subvol_sync_usage); |
| } |
| } |
| |
| if (check_argc_min(argc - optind, 1)) |
| usage(cmd_subvol_sync_usage); |
| |
| fd = btrfs_open_dir(argv[optind], &dirstream, 1); |
| if (fd < 0) { |
| ret = 1; |
| goto out; |
| } |
| optind++; |
| |
| id_count = argc - optind; |
| if (!id_count) { |
| id_count = enumerate_dead_subvols(fd, &ids); |
| if (id_count < 0) { |
| error("can't enumerate dead subvolumes: %s", |
| strerror(-id_count)); |
| ret = 1; |
| goto out; |
| } |
| if (id_count == 0) { |
| ret = 0; |
| goto out; |
| } |
| } else { |
| ids = (u64*)malloc(id_count * sizeof(u64)); |
| if (!ids) { |
| error("not enough memory"); |
| ret = 1; |
| goto out; |
| } |
| |
| for (i = 0; i < id_count; i++) { |
| u64 id; |
| const char *arg; |
| |
| arg = argv[optind + i]; |
| errno = 0; |
| id = strtoull(arg, NULL, 10); |
| if (errno < 0) { |
| error("unrecognized subvolume id %s", arg); |
| ret = 1; |
| goto out; |
| } |
| if (id < BTRFS_FIRST_FREE_OBJECTID |
| || id > BTRFS_LAST_FREE_OBJECTID) { |
| error("subvolume id %s out of range", arg); |
| ret = 1; |
| goto out; |
| } |
| ids[i] = id; |
| } |
| } |
| |
| ret = wait_for_subvolume_cleaning(fd, id_count, ids, sleep_interval); |
| |
| out: |
| free(ids); |
| close_file_or_dir(fd, dirstream); |
| |
| return !!ret; |
| } |
| |
| static const char subvolume_cmd_group_info[] = |
| "manage subvolumes: create, delete, list, etc"; |
| |
| const struct cmd_group subvolume_cmd_group = { |
| subvolume_cmd_group_usage, subvolume_cmd_group_info, { |
| { "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 }, |
| { "delete", cmd_subvol_delete, cmd_subvol_delete_usage, NULL, 0 }, |
| { "list", cmd_subvol_list, cmd_subvol_list_usage, NULL, 0 }, |
| { "snapshot", cmd_subvol_snapshot, cmd_subvol_snapshot_usage, |
| NULL, 0 }, |
| { "get-default", cmd_subvol_get_default, |
| cmd_subvol_get_default_usage, NULL, 0 }, |
| { "set-default", cmd_subvol_set_default, |
| cmd_subvol_set_default_usage, NULL, 0 }, |
| { "find-new", cmd_subvol_find_new, cmd_subvol_find_new_usage, |
| NULL, 0 }, |
| { "show", cmd_subvol_show, cmd_subvol_show_usage, NULL, 0 }, |
| { "sync", cmd_subvol_sync, cmd_subvol_sync_usage, NULL, 0 }, |
| NULL_CMD_STRUCT |
| } |
| }; |
| |
| int cmd_subvolume(int argc, char **argv) |
| { |
| return handle_command_group(&subvolume_cmd_group, argc, argv); |
| } |