From 3d69435ee3292b4b1db2d61c4784789d75883821 Mon Sep 17 00:00:00 2001 From: Dimitri John Ledkov Date: Tue, 26 Jul 2016 13:24:39 +0100 Subject: Imported Upstream version 4.6.1 --- cmds-subvolume.c | 1297 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1297 insertions(+) create mode 100644 cmds-subvolume.c (limited to 'cmds-subvolume.c') diff --git a/cmds-subvolume.c b/cmds-subvolume.c new file mode 100644 index 00000000..e3d2cbce --- /dev/null +++ b/cmds-subvolume.c @@ -0,0 +1,1297 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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" + +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 ", + NULL +}; + +static const char * const cmd_subvol_create_usage[] = { + "btrfs subvolume create [-i ] [/]", + "Create a subvolume", + "Create a subvolume in . If is not given", + "subvolume will be created in the current directory.", + "", + "-i 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; + + optind = 1; + while (1) { + int c = getopt(argc, argv, "c:i:v"); + 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] [...]", + "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", + 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; + + optind = 1; + 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 */ + {NULL, 0, NULL, 0} + }; + + c = getopt_long(argc, argv, "cC", 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] ", + "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 ", + "-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_tab_result = 0; + int is_list_all = 0; + int is_only_in_path = 0; + DIR *dirstream = NULL; + + filter_set = btrfs_list_alloc_filter_set(); + comparer_set = btrfs_list_alloc_comparer_set(); + + optind = 1; + 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': + is_tab_result = 1; + 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 (flags) + btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_FLAGS, + flags); + + 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; + } + + ret = btrfs_list_get_path_rootid(fd, &top_id); + if (ret) { + error("can't get rootid for '%s'", subvol); + 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); + + if (is_tab_result) + ret = btrfs_list_subvols_print(fd, filter_set, comparer_set, + BTRFS_LIST_LAYOUT_TABLE, + !is_list_all && !is_only_in_path, NULL); + else + ret = btrfs_list_subvols_print(fd, filter_set, comparer_set, + BTRFS_LIST_LAYOUT_DEFAULT, + !is_list_all && !is_only_in_path, NULL); + +out: + close_file_or_dir(fd, dirstream); + if (filter_set) + btrfs_list_free_filter_set(filter_set); + if (comparer_set) + btrfs_list_free_comparer_set(comparer_set); + if (uerr) + usage(cmd_subvol_list_usage); + return !!ret; +} + +static const char * const cmd_subvol_snapshot_usage[] = { + "btrfs subvolume snapshot [-r] [-i ] |[/]", + "Create a snapshot of the subvolume", + "Create a writable/readonly snapshot of the subvolume with", + "the name in the directory. If only is given,", + "the subvolume will be named the basename of .", + "", + "-r create a readonly snapshot", + "-i 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; + + optind = 1; + 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 ", + "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) + btrfs_list_free_filter_set(filter_set); +out: + close_file_or_dir(fd, dirstream); + return !!ret; +} + +static const char * const cmd_subvol_set_default_usage[] = { + "btrfs subvolume set-default ", + "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 ", + "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 ", + "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 == 2) { + /* + * Since the top level btrfs was given don't + * take that as error + */ + printf("%s is toplevel subvolume\n", fullpath); + ret = 0; + goto out; + } + if (ret) { + ret < 0 ? + error("Failed to get subvol info %s: %s\n", + fullpath, strerror(-ret)): + error("Failed to get subvol info %s: %d\n", + 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); + btrfs_list_free_filter_set(filter_set); + + close_file_or_dir(fd, dirstream1); + free(fullpath); + return !!ret; +} + +static const char * const cmd_subvol_sync_usage[] = { + "btrfs subvolume sync [...]", + "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 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; + + optind = 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\n", 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); +} -- cgit v1.2.3