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"
34 int list_subvols(int fd
, int print_parent
, int get_default
);
35 int find_updated_files(int fd
, u64 root_id
, u64 oldest_gen
);
37 static const char * const subvolume_cmd_group_usage
[] = {
38 "btrfs subvolume <command> <args>",
43 * test if path is a directory
44 * this function return
45 * 0-> path exists but it is not a directory
46 * 1-> path exists and it is a directory
47 * -1 -> path is unaccessible
49 static int test_isdir(char *path
)
54 res
= stat(path
, &st
);
58 return S_ISDIR(st
.st_mode
);
61 static const char * const cmd_subvol_create_usage
[] = {
62 "btrfs subvolume create [<dest>/]<name>",
64 "Create a subvolume <name> in <dest>. If <dest> is not given",
65 "subvolume <name> will be created in the current directory.",
69 static int cmd_subvol_create(int argc
, char **argv
)
71 int res
, fddst
, len
, e
;
75 struct btrfs_qgroup_inherit
*inherit
= NULL
;
79 int c
= getopt(argc
, argv
, "c:i:r");
85 res
= qgroup_inherit_add_copy(&inherit
, optarg
, 0);
90 res
= qgroup_inherit_add_group(&inherit
, optarg
);
95 usage(cmd_subvol_create_usage
);
99 if (check_argc_exact(argc
- optind
, 1))
100 usage(cmd_subvol_create_usage
);
104 res
= test_isdir(dst
);
106 fprintf(stderr
, "ERROR: '%s' exists\n", dst
);
110 newname
= strdup(dst
);
111 newname
= basename(newname
);
112 dstdir
= strdup(dst
);
113 dstdir
= dirname(dstdir
);
115 if( !strcmp(newname
,".") || !strcmp(newname
,"..") ||
116 strchr(newname
, '/') ){
117 fprintf(stderr
, "ERROR: uncorrect subvolume name ('%s')\n",
122 len
= strlen(newname
);
123 if (len
== 0 || len
>= BTRFS_VOL_NAME_MAX
) {
124 fprintf(stderr
, "ERROR: subvolume name too long ('%s)\n",
129 fddst
= open_file_or_dir(dstdir
);
131 fprintf(stderr
, "ERROR: can't access to '%s'\n", dstdir
);
135 printf("Create subvolume '%s/%s'\n", dstdir
, newname
);
137 struct btrfs_ioctl_vol_args_v2 args
;
139 memset(&args
, 0, sizeof(args
));
140 strncpy(args
.name
, newname
, BTRFS_SUBVOL_NAME_MAX
);
141 args
.name
[BTRFS_SUBVOL_NAME_MAX
-1] = 0;
142 args
.flags
|= BTRFS_SUBVOL_QGROUP_INHERIT
;
143 args
.size
= qgroup_inherit_size(inherit
);
144 args
.qgroup_inherit
= inherit
;
146 res
= ioctl(fddst
, BTRFS_IOC_SUBVOL_CREATE_V2
, &args
);
148 struct btrfs_ioctl_vol_args args
;
150 memset(&args
, 0, sizeof(args
));
151 strncpy(args
.name
, newname
, BTRFS_SUBVOL_NAME_MAX
);
152 args
.name
[BTRFS_SUBVOL_NAME_MAX
-1] = 0;
154 res
= ioctl(fddst
, BTRFS_IOC_SUBVOL_CREATE
, &args
);
162 fprintf( stderr
, "ERROR: cannot create subvolume - %s\n",
172 * test if path is a subvolume:
173 * this function return
174 * 0-> path exists but it is not a subvolume
175 * 1-> path exists and it is a subvolume
176 * -1 -> path is unaccessible
178 int test_issubvolume(char *path
)
183 res
= stat(path
, &st
);
187 return (st
.st_ino
== 256) && S_ISDIR(st
.st_mode
);
190 static const char * const cmd_subvol_delete_usage
[] = {
191 "btrfs subvolume delete <name>",
192 "Delete a subvolume",
196 static int cmd_subvol_delete(int argc
, char **argv
)
199 struct btrfs_ioctl_vol_args args
;
200 char *dname
, *vname
, *cpath
;
203 if (check_argc_exact(argc
, 2))
204 usage(cmd_subvol_delete_usage
);
208 res
= test_issubvolume(path
);
210 fprintf(stderr
, "ERROR: error accessing '%s'\n", path
);
214 fprintf(stderr
, "ERROR: '%s' is not a subvolume\n", path
);
218 cpath
= realpath(path
, 0);
219 dname
= strdup(cpath
);
220 dname
= dirname(dname
);
221 vname
= strdup(cpath
);
222 vname
= basename(vname
);
225 if( !strcmp(vname
,".") || !strcmp(vname
,"..") ||
226 strchr(vname
, '/') ){
227 fprintf(stderr
, "ERROR: incorrect subvolume name ('%s')\n",
233 if (len
== 0 || len
>= BTRFS_VOL_NAME_MAX
) {
234 fprintf(stderr
, "ERROR: snapshot name too long ('%s)\n",
239 fd
= open_file_or_dir(dname
);
242 fprintf(stderr
, "ERROR: can't access to '%s'\n", dname
);
246 printf("Delete subvolume '%s/%s'\n", dname
, vname
);
247 strncpy(args
.name
, vname
, BTRFS_PATH_NAME_MAX
);
248 args
.name
[BTRFS_PATH_NAME_MAX
-1] = 0;
249 res
= ioctl(fd
, BTRFS_IOC_SNAP_DESTROY
, &args
);
255 fprintf( stderr
, "ERROR: cannot delete '%s/%s' - %s\n",
256 dname
, vname
, strerror(e
));
263 static const char * const cmd_subvol_list_usage
[] = {
264 "btrfs subvolume list [-p] <path>",
265 "List subvolumes (and snapshots)",
267 "-p print parent ID",
271 static int cmd_subvol_list(int argc
, char **argv
)
275 int print_parent
= 0;
280 int c
= getopt(argc
, argv
, "p");
289 usage(cmd_subvol_list_usage
);
293 if (check_argc_exact(argc
- optind
, 1))
294 usage(cmd_subvol_list_usage
);
296 subvol
= argv
[optind
];
298 ret
= test_issubvolume(subvol
);
300 fprintf(stderr
, "ERROR: error accessing '%s'\n", subvol
);
304 fprintf(stderr
, "ERROR: '%s' is not a subvolume\n", subvol
);
308 fd
= open_file_or_dir(subvol
);
310 fprintf(stderr
, "ERROR: can't access '%s'\n", subvol
);
313 ret
= list_subvols(fd
, print_parent
, 0);
319 static const char * const cmd_snapshot_usage
[] = {
320 "btrfs subvolume snapshot [-r] <source> [<dest>/]<name>",
321 "Create a snapshot of the subvolume",
322 "Create a writable/readonly snapshot of the subvolume <source> with",
323 "the name <name> in the <dest> directory",
325 "-r create a readonly snapshot",
329 static int cmd_snapshot(int argc
, char **argv
)
332 int res
, fd
, fddst
, len
, e
, readonly
= 0;
335 struct btrfs_ioctl_vol_args_v2 args
;
336 struct btrfs_qgroup_inherit
*inherit
= NULL
;
339 memset(&args
, 0, sizeof(args
));
341 int c
= getopt(argc
, argv
, "c:i:r");
347 res
= qgroup_inherit_add_copy(&inherit
, optarg
, 0);
352 res
= qgroup_inherit_add_group(&inherit
, optarg
);
360 res
= qgroup_inherit_add_copy(&inherit
, optarg
, 1);
365 usage(cmd_snapshot_usage
);
369 if (check_argc_exact(argc
- optind
, 2))
370 usage(cmd_snapshot_usage
);
372 subvol
= argv
[optind
];
373 dst
= argv
[optind
+ 1];
375 res
= test_issubvolume(subvol
);
377 fprintf(stderr
, "ERROR: error accessing '%s'\n", subvol
);
381 fprintf(stderr
, "ERROR: '%s' is not a subvolume\n", subvol
);
385 res
= test_isdir(dst
);
387 fprintf(stderr
, "ERROR: '%s' exists and it is not a directory\n", dst
);
392 newname
= strdup(subvol
);
393 newname
= basename(newname
);
396 newname
= strdup(dst
);
397 newname
= basename(newname
);
398 dstdir
= strdup(dst
);
399 dstdir
= dirname(dstdir
);
402 if( !strcmp(newname
,".") || !strcmp(newname
,"..") ||
403 strchr(newname
, '/') ){
404 fprintf(stderr
, "ERROR: incorrect snapshot name ('%s')\n",
409 len
= strlen(newname
);
410 if (len
== 0 || len
>= BTRFS_VOL_NAME_MAX
) {
411 fprintf(stderr
, "ERROR: snapshot name too long ('%s)\n",
416 fddst
= open_file_or_dir(dstdir
);
418 fprintf(stderr
, "ERROR: can't access to '%s'\n", dstdir
);
422 fd
= open_file_or_dir(subvol
);
425 fprintf(stderr
, "ERROR: can't access to '%s'\n", dstdir
);
430 args
.flags
|= BTRFS_SUBVOL_RDONLY
;
431 printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
432 subvol
, dstdir
, newname
);
434 printf("Create a snapshot of '%s' in '%s/%s'\n",
435 subvol
, dstdir
, newname
);
440 args
.flags
|= BTRFS_SUBVOL_QGROUP_INHERIT
;
441 args
.size
= qgroup_inherit_size(inherit
);
442 args
.qgroup_inherit
= inherit
;
444 strncpy(args
.name
, newname
, BTRFS_SUBVOL_NAME_MAX
);
445 args
.name
[BTRFS_SUBVOL_NAME_MAX
-1] = 0;
446 res
= ioctl(fddst
, BTRFS_IOC_SNAP_CREATE_V2
, &args
);
453 fprintf( stderr
, "ERROR: cannot snapshot '%s' - %s\n",
454 subvol
, strerror(e
));
462 static const char * const cmd_subvol_get_default_usage
[] = {
463 "btrfs subvolume get-default <path>",
464 "Get the default subvolume of a filesystem",
468 static int cmd_subvol_get_default(int argc
, char **argv
)
474 if (check_argc_exact(argc
, 2))
475 usage(cmd_subvol_get_default_usage
);
479 ret
= test_issubvolume(subvol
);
481 fprintf(stderr
, "ERROR: error accessing '%s'\n", subvol
);
485 fprintf(stderr
, "ERROR: '%s' is not a subvolume\n", subvol
);
489 fd
= open_file_or_dir(subvol
);
491 fprintf(stderr
, "ERROR: can't access '%s'\n", subvol
);
494 ret
= list_subvols(fd
, 0, 1);
500 static const char * const cmd_subvol_set_default_usage
[] = {
501 "btrfs subvolume set-default <subvolid> <path>",
502 "Set the default subvolume of a filesystem",
506 static int cmd_subvol_set_default(int argc
, char **argv
)
513 if (check_argc_exact(argc
, 3))
514 usage(cmd_subvol_set_default_usage
);
519 fd
= open_file_or_dir(path
);
521 fprintf(stderr
, "ERROR: can't access to '%s'\n", path
);
525 objectid
= (unsigned long long)strtoll(subvolid
, NULL
, 0);
526 if (errno
== ERANGE
) {
527 fprintf(stderr
, "ERROR: invalid tree id (%s)\n",subvolid
);
530 ret
= ioctl(fd
, BTRFS_IOC_DEFAULT_SUBVOL
, &objectid
);
534 fprintf(stderr
, "ERROR: unable to set a new default subvolume - %s\n",
541 static const char * const cmd_find_new_usage
[] = {
542 "btrfs subvolume find-new <path> <lastgen>",
543 "List the recently modified files in a filesystem",
547 static int cmd_find_new(int argc
, char **argv
)
554 if (check_argc_exact(argc
, 3))
555 usage(cmd_find_new_usage
);
558 last_gen
= atoll(argv
[2]);
560 ret
= test_issubvolume(subvol
);
562 fprintf(stderr
, "ERROR: error accessing '%s'\n", subvol
);
566 fprintf(stderr
, "ERROR: '%s' is not a subvolume\n", subvol
);
570 fd
= open_file_or_dir(subvol
);
572 fprintf(stderr
, "ERROR: can't access '%s'\n", subvol
);
575 ret
= find_updated_files(fd
, 0, last_gen
);
581 const struct cmd_group subvolume_cmd_group
= {
582 subvolume_cmd_group_usage
, NULL
, {
583 { "create", cmd_subvol_create
, cmd_subvol_create_usage
, NULL
, 0 },
584 { "delete", cmd_subvol_delete
, cmd_subvol_delete_usage
, NULL
, 0 },
585 { "list", cmd_subvol_list
, cmd_subvol_list_usage
, NULL
, 0 },
586 { "snapshot", cmd_snapshot
, cmd_snapshot_usage
, NULL
, 0 },
587 { "get-default", cmd_subvol_get_default
,
588 cmd_subvol_get_default_usage
, NULL
, 0 },
589 { "set-default", cmd_subvol_set_default
,
590 cmd_subvol_set_default_usage
, NULL
, 0 },
591 { "find-new", cmd_find_new
, cmd_find_new_usage
, NULL
, 0 },
596 int cmd_subvolume(int argc
, char **argv
)
598 return handle_command_group(&subvolume_cmd_group
, argc
, argv
);