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) {
fprintf(stderr, "ERROR: '%s' exists\n", dst);
goto out;
}
dupname = strdup(dst);
newname = basename(dupname);
dupdir = strdup(dst);
dstdir = dirname(dupdir);
if (!test_issubvolname(newname)) {
fprintf(stderr, "ERROR: incorrect subvolume name '%s'\n",
newname);
goto out;
}
len = strlen(newname);
if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
fprintf(stderr, "ERROR: subvolume name too long '%s'\n",
newname);
goto out;
}
fddst = open_file_or_dir(dstdir, &dirstream);
if (fddst < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", dstdir);
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) {
fprintf(stderr, "ERROR: cannot create subvolume - %s\n",
strerror(errno));
goto out;
}
retval = 0; /* success */
out:
close_file_or_dir(fddst, dirstream);
free(inherit);
free(dupname);
free(dupdir);
return retval;
}
static int cmd_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_snapshot_usage);
}
}
if (check_argc_exact(argc - optind, 2))
usage(cmd_snapshot_usage);
subvol = argv[optind];
dst = argv[optind + 1];
retval = 1; /* failure */
res = test_issubvolume(subvol);
if (res < 0) {
fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
goto out;
}
if (!res) {
fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
goto out;
}
res = test_isdir(dst);
if (res == 0) {
fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", 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)) {
fprintf(stderr, "ERROR: incorrect snapshot name '%s'\n",
newname);
goto out;
}
len = strlen(newname);
if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
fprintf(stderr, "ERROR: snapshot name too long '%s'\n",
newname);
goto out;
}
fddst = open_file_or_dir(dstdir, &dirstream1);
if (fddst < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", dstdir);
goto out;
}
fd = open_file_or_dir(subvol, &dirstream2);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", dstdir);
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) {
fprintf( stderr, "ERROR: cannot snapshot '%s' - %s\n",
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 int cmd_subvol_delete(int argc, char **argv)
{
int res, len, e, 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 sync_mode = 0;
struct option long_options[] = {
{"commit-after", no_argument, NULL, 'c'}, /* sync mode 1 */
{"commit-each", no_argument, NULL, 'C'}, /* sync mode 2 */
{NULL, 0, NULL, 0}
};
optind = 1;
while (1) {
int c;
c = getopt_long(argc, argv, "cC", long_options, NULL);
if (c < 0)
break;
switch(c) {
case 'c':
sync_mode = 1;
break;
case 'C':
sync_mode = 2;
break;
default:
usage(cmd_subvol_delete_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_subvol_delete_usage);
printf("Transaction commit: %s\n",
!sync_mode ? "none (default)" :
sync_mode == 1 ? "at the end" : "after each");
cnt = optind;
again:
path = argv[cnt];
res = test_issubvolume(path);
if (res < 0) {
fprintf(stderr, "ERROR: error accessing '%s'\n", path);
ret = 1;
goto out;
}
if (!res) {
fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
ret = 1;
goto out;
}
cpath = realpath(path, NULL);
if (!cpath) {
ret = errno;
fprintf(stderr, "ERROR: finding real path for '%s': %s\n",
path, strerror(errno));
goto out;
}
dupdname = strdup(cpath);
dname = dirname(dupdname);
dupvname = strdup(cpath);
vname = basename(dupvname);
free(cpath);
if (!test_issubvolname(vname)) {
fprintf(stderr, "ERROR: incorrect subvolume name '%s'\n",
vname);
ret = 1;
goto out;
}
len = strlen(vname);
if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
fprintf(stderr, "ERROR: snapshot name too long '%s'\n",
vname);
ret = 1;
goto out;
}
fd = open_file_or_dir(dname, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", dname);
ret = 1;
goto out;
}
printf("Delete subvolume '%s/%s'\n", dname, vname);
strncpy_null(args.name, vname);
res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
e = errno;
if(res < 0 ){
fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
dname, vname, strerror(e));
ret = 1;
goto out;
}
if (sync_mode == 1) {
res = wait_for_commit(fd);
if (res < 0) {
fprintf(stderr,
"ERROR: unable to wait for commit after '%s': %s\n",
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 (sync_mode == 2 && fd != -1) {
res = wait_for_commit(fd);
if (res < 0) {
fprintf(stderr,
"ERROR: unable to do final sync: %s\n",
strerror(errno));
ret = 1;
}
}
close_file_or_dir(fd, dirstream);
return ret;
}
