2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
21 #include <sys/ioctl.h>
27 #include "kerncompat.h"
33 int list_subvols(int fd, int print_parent, int get_default);
34 int find_updated_files(int fd, u64 root_id, u64 oldest_gen);
36 static const char * const subvolume_cmd_group_usage[] = {
37 "btrfs subvolume <command> <args>",
42 * test if path is a directory
43 * this function return
44 * 0-> path exists but it is not a directory
45 * 1-> path exists and it is a directory
46 * -1 -> path is unaccessible
48 static int test_isdir(char *path)
53 res = stat(path, &st);
57 return S_ISDIR(st.st_mode);
60 static const char * const cmd_subvol_create_usage[] = {
61 "btrfs subvolume create [<dest>/]<name>",
63 "Create a subvolume <name> in <dest>. If <dest> is not given",
64 "subvolume <name> will be created in the current directory.",
68 static int cmd_subvol_create(int argc, char **argv)
70 int res, fddst, len, e;
73 struct btrfs_ioctl_vol_args args;
76 if (check_argc_exact(argc, 2))
77 usage(cmd_subvol_create_usage);
81 res = test_isdir(dst);
83 fprintf(stderr, "ERROR: '%s' exists\n", dst);
87 newname = strdup(dst);
88 newname = basename(newname);
90 dstdir = dirname(dstdir);
92 if( !strcmp(newname,".") || !strcmp(newname,"..") ||
93 strchr(newname, '/') ){
94 fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
99 len = strlen(newname);
100 if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
101 fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
106 fddst = open_file_or_dir(dstdir);
108 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
112 printf("Create subvolume '%s/%s'\n", dstdir, newname);
113 strncpy(args.name, newname, BTRFS_PATH_NAME_MAX);
114 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
115 res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
121 fprintf( stderr, "ERROR: cannot create subvolume - %s\n",
130 * test if path is a subvolume:
131 * this function return
132 * 0-> path exists but it is not a subvolume
133 * 1-> path exists and it is a subvolume
134 * -1 -> path is unaccessible
136 static int test_issubvolume(char *path)
141 res = stat(path, &st);
145 return (st.st_ino == 256) && S_ISDIR(st.st_mode);
148 static const char * const cmd_subvol_delete_usage[] = {
149 "btrfs subvolume delete <name>",
150 "Delete a subvolume",
154 static int cmd_subvol_delete(int argc, char **argv)
157 struct btrfs_ioctl_vol_args args;
158 char *dname, *vname, *cpath;
161 if (check_argc_exact(argc, 2))
162 usage(cmd_subvol_delete_usage);
166 res = test_issubvolume(path);
168 fprintf(stderr, "ERROR: error accessing '%s'\n", path);
172 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
176 cpath = realpath(path, 0);
177 dname = strdup(cpath);
178 dname = dirname(dname);
179 vname = strdup(cpath);
180 vname = basename(vname);
183 if( !strcmp(vname,".") || !strcmp(vname,"..") ||
184 strchr(vname, '/') ){
185 fprintf(stderr, "ERROR: incorrect subvolume name ('%s')\n",
191 if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
192 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
197 fd = open_file_or_dir(dname);
200 fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
204 printf("Delete subvolume '%s/%s'\n", dname, vname);
205 strncpy(args.name, vname, BTRFS_PATH_NAME_MAX);
206 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
207 res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
213 fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
214 dname, vname, strerror(e));
221 static const char * const cmd_subvol_list_usage[] = {
222 "btrfs subvolume list [-p] <path>",
223 "List subvolumes (and snapshots)",
225 "-p print parent ID",
229 static int cmd_subvol_list(int argc, char **argv)
233 int print_parent = 0;
238 int c = getopt(argc, argv, "p");
247 usage(cmd_subvol_list_usage);
251 if (check_argc_exact(argc - optind, 1))
252 usage(cmd_subvol_list_usage);
254 subvol = argv[optind];
256 ret = test_issubvolume(subvol);
258 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
262 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
266 fd = open_file_or_dir(subvol);
268 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
271 ret = list_subvols(fd, print_parent, 0);
277 static const char * const cmd_snapshot_usage[] = {
278 "btrfs subvolume snapshot [-r] <source> [<dest>/]<name>",
279 "Create a snapshot of the subvolume",
280 "Create a writable/readonly snapshot of the subvolume <source> with",
281 "the name <name> in the <dest> directory",
283 "-r create a readonly snapshot",
287 static int cmd_snapshot(int argc, char **argv)
290 int res, fd, fddst, len, e, readonly = 0;
293 struct btrfs_ioctl_vol_args_v2 args;
295 memset(&args, 0, sizeof(args));
299 int c = getopt(argc, argv, "r");
308 usage(cmd_snapshot_usage);
312 if (check_argc_exact(argc - optind, 2))
313 usage(cmd_snapshot_usage);
315 subvol = argv[optind];
316 dst = argv[optind + 1];
318 res = test_issubvolume(subvol);
320 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
324 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
328 res = test_isdir(dst);
330 fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", dst);
335 newname = strdup(subvol);
336 newname = basename(newname);
339 newname = strdup(dst);
340 newname = basename(newname);
341 dstdir = strdup(dst);
342 dstdir = dirname(dstdir);
345 if( !strcmp(newname,".") || !strcmp(newname,"..") ||
346 strchr(newname, '/') ){
347 fprintf(stderr, "ERROR: incorrect snapshot name ('%s')\n",
352 len = strlen(newname);
353 if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
354 fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
359 fddst = open_file_or_dir(dstdir);
361 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
365 fd = open_file_or_dir(subvol);
368 fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
373 args.flags |= BTRFS_SUBVOL_RDONLY;
374 printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
375 subvol, dstdir, newname);
377 printf("Create a snapshot of '%s' in '%s/%s'\n",
378 subvol, dstdir, newname);
382 strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
383 args.name[BTRFS_SUBVOL_NAME_MAX-1] = 0;
384 res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args);
391 fprintf( stderr, "ERROR: cannot snapshot '%s' - %s\n",
392 subvol, strerror(e));
399 static const char * const cmd_subvol_get_default_usage[] = {
400 "btrfs subvolume get-dafault <path>",
401 "Get the default subvolume of a filesystem",
405 static int cmd_subvol_get_default(int argc, char **argv)
411 if (check_argc_exact(argc, 2))
412 usage(cmd_subvol_get_default_usage);
416 ret = test_issubvolume(subvol);
418 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
422 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
426 fd = open_file_or_dir(subvol);
428 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
431 ret = list_subvols(fd, 0, 1);
437 static const char * const cmd_subvol_set_default_usage[] = {
438 "btrfs subvolume set-dafault <subvolid> <path>",
439 "Set the default subvolume of a filesystem",
443 static int cmd_subvol_set_default(int argc, char **argv)
450 if (check_argc_exact(argc, 3))
451 usage(cmd_subvol_set_default_usage);
456 fd = open_file_or_dir(path);
458 fprintf(stderr, "ERROR: can't access to '%s'\n", path);
462 objectid = (unsigned long long)strtoll(subvolid, NULL, 0);
463 if (errno == ERANGE) {
464 fprintf(stderr, "ERROR: invalid tree id (%s)\n",subvolid);
467 ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
471 fprintf(stderr, "ERROR: unable to set a new default subvolume - %s\n",
478 static const char * const cmd_find_new_usage[] = {
479 "btrfs subvolume find-new <path> <lastgen>",
480 "List the recently modified files in a filesystem",
484 static int cmd_find_new(int argc, char **argv)
491 if (check_argc_exact(argc, 3))
492 usage(cmd_find_new_usage);
495 last_gen = atoll(argv[2]);
497 ret = test_issubvolume(subvol);
499 fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
503 fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
507 fd = open_file_or_dir(subvol);
509 fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
512 ret = find_updated_files(fd, 0, last_gen);
518 const struct cmd_group subvolume_cmd_group = {
519 subvolume_cmd_group_usage, NULL, {
520 { "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
521 { "delete", cmd_subvol_delete, cmd_subvol_delete_usage, NULL, 0 },
522 { "list", cmd_subvol_list, cmd_subvol_list_usage, NULL, 0 },
523 { "snapshot", cmd_snapshot, cmd_snapshot_usage, NULL, 0 },
524 { "get-default", cmd_subvol_get_default,
525 cmd_subvol_get_default_usage, NULL, 0 },
526 { "set-default", cmd_subvol_set_default,
527 cmd_subvol_set_default_usage, NULL, 0 },
528 { "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
533 int cmd_subvolume(int argc, char **argv)
535 return handle_command_group(&subvolume_cmd_group, argc, argv);