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-rw-r--r--cmds-subvolume.c1347
1 files changed, 1347 insertions, 0 deletions
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
new file mode 100644
index 00000000..9d9b0af7
--- /dev/null
+++ b/cmds-subvolume.c
@@ -0,0 +1,1347 @@
+/*
+ * 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"
+
+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;
+
+ 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;
+}
+
+/*
+ * Test if path is a subvolume
+ * Returns:
+ * 0 - path exists but it is not a subvolume
+ * 1 - path exists and it is a subvolume
+ * < 0 - error
+ */
+int test_issubvolume(const char *path)
+{
+ struct stat st;
+ struct statfs stfs;
+ int res;
+
+ res = stat(path, &st);
+ if (res < 0)
+ return -errno;
+
+ if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode))
+ return 0;
+
+ res = statfs(path, &stfs);
+ if (res < 0)
+ return -errno;
+
+ return (int)stfs.f_type == BTRFS_SUPER_MAGIC;
+}
+
+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",
+ 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] <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_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 <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;
+
+ 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 <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;
+
+ if (check_argc_exact(argc, 2))
+ 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 <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;
+
+ if (check_argc_exact(argc, 3))
+ usage(cmd_subvol_set_default_usage);
+
+ subvolid = argv[1];
+ path = argv[2];
+
+ 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;
+
+ if (check_argc_exact(argc, 3))
+ usage(cmd_subvol_find_new_usage);
+
+ subvol = argv[1];
+ last_gen = arg_strtou64(argv[2]);
+
+ 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;
+ char tstr[256];
+ char uuidparse[BTRFS_UUID_UNPARSED_SIZE];
+ char *fullpath = NULL, *svpath = NULL, *mnt = NULL;
+ char raw_prefix[] = "\t\t\t\t";
+ u64 sv_id;
+ int fd = -1, mntfd = -1;
+ int ret = 1;
+ DIR *dirstream1 = NULL, *dirstream2 = NULL;
+
+ clean_args_no_options(argc, argv, cmd_subvol_show_usage);
+
+ if (check_argc_exact(argc - optind, 1))
+ usage(cmd_subvol_show_usage);
+
+ fullpath = realpath(argv[optind], NULL);
+ if (!fullpath) {
+ error("cannot find real path for '%s': %s",
+ argv[optind], strerror(errno));
+ goto out;
+ }
+
+ ret = test_issubvolume(fullpath);
+ if (ret < 0) {
+ error("cannot access subvolume %s: %s", fullpath,
+ strerror(-ret));
+ goto out;
+ }
+ if (!ret) {
+ error("not a subvolume: %s", fullpath);
+ ret = 1;
+ goto out;
+ }
+
+ ret = find_mount_root(fullpath, &mnt);
+ if (ret < 0) {
+ error("find_mount_root failed on '%s': %s",
+ fullpath, strerror(-ret));
+ goto out;
+ }
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point", fullpath);
+ goto out;
+ }
+ ret = 1;
+ svpath = get_subvol_name(mnt, fullpath);
+
+ fd = btrfs_open_dir(fullpath, &dirstream1, 1);
+ if (fd < 0)
+ goto out;
+
+ ret = btrfs_list_get_path_rootid(fd, &sv_id);
+ if (ret) {
+ error("can't get rootid for '%s'", fullpath);
+ goto out;
+ }
+
+ mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
+ if (mntfd < 0)
+ goto out;
+
+ if (sv_id == BTRFS_FS_TREE_OBJECTID) {
+ printf("%s is toplevel subvolume\n", fullpath);
+ goto out;
+ }
+
+ memset(&get_ri, 0, sizeof(get_ri));
+ get_ri.root_id = sv_id;
+
+ ret = btrfs_get_subvol(mntfd, &get_ri);
+ if (ret) {
+ error("can't find '%s'", svpath);
+ goto out;
+ }
+
+ /* 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);
+ btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW,
+ 1, raw_prefix);
+
+ /* clean up */
+ free(get_ri.path);
+ free(get_ri.name);
+ free(get_ri.full_path);
+ btrfs_list_free_filter_set(filter_set);
+
+out:
+ close_file_or_dir(fd, dirstream1);
+ close_file_or_dir(mntfd, dirstream2);
+ free(mnt);
+ 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 (sh->type == BTRFS_ORPHAN_ITEM_KEY) {
+ if (idx >= count) {
+ u64 *newids;
+
+ count += SUBVOL_ID_BATCH;
+ newids = (u64*)realloc(*ids, count);
+ if (!newids)
+ return -ENOMEM;
+ *ids = newids;
+ }
+ (*ids)[idx] = sh->offset;
+ idx++;
+ }
+ off += sh->len;
+
+ sk->min_objectid = sh->objectid;
+ sk->min_type = sh->type;
+ sk->min_offset = sh->offset;
+ }
+ 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(argv[optind]);
+ if (sleep_interval < 1) {
+ error("invalid sleep interval %s",
+ argv[optind]);
+ 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 06:48:40 +0000