static int process_subvol(const char *path, const u8 *uuid, u64 ctransid,
void *user)
{
int ret;
struct btrfs_receive *r = user;
struct btrfs_ioctl_vol_args args_v1;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
ret = finish_subvol(r);
if (ret < 0)
goto out;
BUG_ON(r->cur_subvol.path);
BUG_ON(r->cur_subvol_path[0]);
if (*r->dest_dir_path == 0) {
strncpy_null(r->cur_subvol_path, path);
} else {
ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
if (ret < 0) {
error("subvol: path invalid: %s\n", path);
goto out;
}
}
ret = path_cat3_out(r->full_subvol_path, r->root_path,
r->dest_dir_path, path);
if (ret < 0) {
error("subvol: path invalid: %s", path);
goto out;
}
fprintf(stderr, "At subvol %s\n", path);
memcpy(r->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
r->cur_subvol.stransid = ctransid;
if (g_verbose) {
uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
fprintf(stderr, "receiving subvol %s uuid=%s, stransid=%llu\n",
path, uuid_str,
r->cur_subvol.stransid);
}
memset(&args_v1, 0, sizeof(args_v1));
strncpy_null(args_v1.name, path);
ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SUBVOL_CREATE, &args_v1);
if (ret < 0) {
ret = -errno;
error("creating subvolume %s failed: %s", path, strerror(-ret));
goto out;
}
out:
return ret;
}
static int process_subvol(const char *path, const u8 *uuid, u64 ctransid,
void *user)
{
int ret;
struct btrfs_receive *r = user;
struct btrfs_ioctl_vol_args args_v1;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
ret = finish_subvol(r);
if (ret < 0)
goto out;
r->cur_subvol = calloc(1, sizeof(*r->cur_subvol));
if (strlen(r->dest_dir_path) == 0)
r->cur_subvol->path = strdup(path);
else
r->cur_subvol->path = path_cat(r->dest_dir_path, path);
free(r->full_subvol_path);
r->full_subvol_path = path_cat3(r->root_path, r->dest_dir_path, path);
fprintf(stderr, "At subvol %s\n", path);
memcpy(r->cur_subvol->received_uuid, uuid, BTRFS_UUID_SIZE);
r->cur_subvol->stransid = ctransid;
if (g_verbose) {
uuid_unparse((u8*)r->cur_subvol->received_uuid, uuid_str);
fprintf(stderr, "receiving subvol %s uuid=%s, stransid=%llu\n",
path, uuid_str,
r->cur_subvol->stransid);
}
memset(&args_v1, 0, sizeof(args_v1));
strncpy_null(args_v1.name, path);
ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SUBVOL_CREATE, &args_v1);
if (ret < 0) {
ret = -errno;
fprintf(stderr, "ERROR: creating subvolume %s failed. "
"%s\n", path, strerror(-ret));
goto out;
}
out:
return ret;
}
int do_receive(struct btrfs_receive *r, const char *tomnt, int r_fd)
{
int ret;
int end = 0;
r->root_path = strdup(tomnt);
r->mnt_fd = open(tomnt, O_RDONLY | O_NOATIME);
if (r->mnt_fd < 0) {
ret = -errno;
fprintf(stderr, "ERROR: failed to open %s. %s\n", tomnt,
strerror(-ret));
goto out;
}
ret = subvol_uuid_search_init(r->mnt_fd, &r->sus);
if (ret < 0)
return ret;
r->write_fd = -1;
while (!end) {
ret = btrfs_read_and_process_send_stream(r_fd, &send_ops, r);
if (ret < 0)
goto out;
if (ret)
end = 1;
ret = close_inode_for_write(r);
if (ret < 0)
goto out;
ret = finish_subvol(r);
if (ret < 0)
goto out;
}
ret = 0;
out:
return ret;
}
static int process_snapshot(const char *path, const u8 *uuid, u64 ctransid,
const u8 *parent_uuid, u64 parent_ctransid,
void *user)
{
int ret;
struct btrfs_receive *r = user;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
struct btrfs_ioctl_vol_args_v2 args_v2;
struct subvol_info *parent_subvol = NULL;
ret = finish_subvol(r);
if (ret < 0)
goto out;
BUG_ON(r->cur_subvol.path);
BUG_ON(r->cur_subvol_path[0]);
if (*r->dest_dir_path == 0) {
strncpy_null(r->cur_subvol_path, path);
} else {
ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
if (ret < 0) {
error("snapshot: path invalid: %s", path);
goto out;
}
}
ret = path_cat3_out(r->full_subvol_path, r->root_path,
r->dest_dir_path, path);
if (ret < 0) {
error("snapshot: path invalid: %s", path);
goto out;
}
fprintf(stdout, "At snapshot %s\n", path);
memcpy(r->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
r->cur_subvol.stransid = ctransid;
if (g_verbose) {
uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
fprintf(stderr, "receiving snapshot %s uuid=%s, "
"ctransid=%llu ", path, uuid_str,
r->cur_subvol.stransid);
uuid_unparse(parent_uuid, uuid_str);
fprintf(stderr, "parent_uuid=%s, parent_ctransid=%llu\n",
uuid_str, parent_ctransid);
}
memset(&args_v2, 0, sizeof(args_v2));
strncpy_null(args_v2.name, path);
parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
parent_ctransid, NULL, subvol_search_by_received_uuid);
if (!parent_subvol) {
parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
parent_ctransid, NULL, subvol_search_by_uuid);
}
if (!parent_subvol) {
ret = -ENOENT;
error("cannot find parent subvolume");
goto out;
}
/*
* The path is resolved from the root subvol, but we could be in some
* subvolume under the root subvolume, so try and adjust the path to be
* relative to our root path.
*/
if (r->full_root_path) {
size_t root_len;
size_t sub_len;
root_len = strlen(r->full_root_path);
sub_len = strlen(parent_subvol->path);
/* First make sure the parent subvol is actually in our path */
if (sub_len < root_len ||
strstr(parent_subvol->path, r->full_root_path) == NULL) {
error(
"parent subvol is not reachable from inside the root subvol");
ret = -ENOENT;
goto out;
}
if (sub_len == root_len) {
parent_subvol->path[0] = '/';
parent_subvol->path[1] = '\0';
} else {
/*
* root path is foo/bar
* subvol path is foo/bar/baz
*
* we need to have baz be the path, so we need to move
* the bit after foo/bar/, so path + root_len + 1, and
* move the part we care about, so sub_len - root_len -
* 1.
*/
memmove(parent_subvol->path,
parent_subvol->path + root_len + 1,
sub_len - root_len - 1);
parent_subvol->path[sub_len - root_len - 1] = '\0';
}
}
/*if (rs_args.ctransid > rs_args.rtransid) {
if (!r->force) {
ret = -EINVAL;
fprintf(stderr, "ERROR: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
goto out;
} else {
fprintf(stderr, "WARNING: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
}
}*/
if (*parent_subvol->path == 0)
args_v2.fd = dup(r->mnt_fd);
else
args_v2.fd = openat(r->mnt_fd, parent_subvol->path,
O_RDONLY | O_NOATIME);
if (args_v2.fd < 0) {
ret = -errno;
if (errno != ENOENT)
error("cannot open %s: %s",
parent_subvol->path, strerror(-ret));
else
fprintf(stderr,
"It seems that you have changed your default "
"subvolume or you specify other subvolume to\n"
"mount btrfs, try to remount this btrfs filesystem "
"with fs tree, and run btrfs receive again!\n");
goto out;
}
ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
close(args_v2.fd);
if (ret < 0) {
ret = -errno;
error("creating snapshot %s -> %s failed: %s",
parent_subvol->path, path, strerror(-ret));
goto out;
}
out:
if (parent_subvol) {
free(parent_subvol->path);
free(parent_subvol);
}
return ret;
}
static int do_receive(struct btrfs_receive *r, const char *tomnt,
char *realmnt, int r_fd, u64 max_errors)
{
u64 subvol_id;
int ret;
char *dest_dir_full_path;
char root_subvol_path[PATH_MAX];
int end = 0;
dest_dir_full_path = realpath(tomnt, NULL);
if (!dest_dir_full_path) {
ret = -errno;
error("realpath(%s) failed: %s", tomnt, strerror(-ret));
goto out;
}
r->dest_dir_fd = open(dest_dir_full_path, O_RDONLY | O_NOATIME);
if (r->dest_dir_fd < 0) {
ret = -errno;
error("cannot open destination directory %s: %s",
dest_dir_full_path, strerror(-ret));
goto out;
}
if (realmnt[0]) {
r->root_path = realmnt;
} else {
ret = find_mount_root(dest_dir_full_path, &r->root_path);
if (ret < 0) {
error("failed to determine mount point for %s: %s",
dest_dir_full_path, strerror(-ret));
ret = -EINVAL;
goto out;
}
if (ret > 0) {
error("%s doesn't belong to btrfs mount point",
dest_dir_full_path);
ret = -EINVAL;
goto out;
}
}
r->mnt_fd = open(r->root_path, O_RDONLY | O_NOATIME);
if (r->mnt_fd < 0) {
ret = -errno;
error("cannot open %s: %s", r->root_path, strerror(-ret));
goto out;
}
/*
* If we use -m or a default subvol we want to resolve the path to the
* subvolume we're sitting in so that we can adjust the paths of any
* subvols we want to receive in.
*/
ret = btrfs_list_get_path_rootid(r->mnt_fd, &subvol_id);
if (ret) {
error("cannot resolve our subvolid: %d",
ret);
goto out;
}
root_subvol_path[0] = 0;
ret = btrfs_subvolid_resolve(r->mnt_fd, root_subvol_path,
PATH_MAX, subvol_id);
if (ret) {
error("cannot resolve our subvol path");
goto out;
}
/*
* Ok we're inside of a subvol off of the root subvol, we need to
* actually set full_root_path.
*/
if (*root_subvol_path)
r->full_root_path = root_subvol_path;
if (r->dest_dir_chroot) {
if (chroot(dest_dir_full_path)) {
ret = -errno;
error("failed to chroot to %s: %s",
dest_dir_full_path, strerror(-ret));
goto out;
}
if (chdir("/")) {
ret = -errno;
error("failed to chdir to / after chroot: %s",
strerror(-ret));
goto out;
}
fprintf(stderr, "Chroot to %s\n", dest_dir_full_path);
r->root_path = strdup("/");
r->dest_dir_path = r->root_path;
} else {
/*
* find_mount_root returns a root_path that is a subpath of
* dest_dir_full_path. Now get the other part of root_path,
* which is the destination dir relative to root_path.
*/
r->dest_dir_path = dest_dir_full_path + strlen(r->root_path);
while (r->dest_dir_path[0] == '/')
r->dest_dir_path++;
}
ret = subvol_uuid_search_init(r->mnt_fd, &r->sus);
if (ret < 0)
goto out;
while (!end) {
if (r->cached_capabilities_len) {
if (g_verbose >= 3)
fprintf(stderr, "clear cached capabilities\n");
memset(r->cached_capabilities, 0,
sizeof(r->cached_capabilities));
r->cached_capabilities_len = 0;
}
ret = btrfs_read_and_process_send_stream(r_fd, &send_ops, r,
r->honor_end_cmd,
max_errors);
if (ret < 0)
goto out;
if (ret)
end = 1;
close_inode_for_write(r);
ret = finish_subvol(r);
if (ret < 0)
goto out;
}
ret = 0;
out:
if (r->write_fd != -1) {
close(r->write_fd);
r->write_fd = -1;
}
if (r->root_path != realmnt)
free(r->root_path);
r->root_path = NULL;
r->dest_dir_path = NULL;
free(dest_dir_full_path);
subvol_uuid_search_finit(&r->sus);
if (r->mnt_fd != -1) {
close(r->mnt_fd);
r->mnt_fd = -1;
}
if (r->dest_dir_fd != -1) {
close(r->dest_dir_fd);
r->dest_dir_fd = -1;
}
return ret;
}
static int do_receive(struct btrfs_receive *r, const char *tomnt, int r_fd,
u64 max_errors)
{
int ret;
char *dest_dir_full_path;
int end = 0;
dest_dir_full_path = realpath(tomnt, NULL);
if (!dest_dir_full_path) {
ret = -errno;
fprintf(stderr, "ERROR: realpath(%s) failed. %s\n", tomnt,
strerror(-ret));
goto out;
}
r->dest_dir_fd = open(dest_dir_full_path, O_RDONLY | O_NOATIME);
if (r->dest_dir_fd < 0) {
ret = -errno;
fprintf(stderr,
"ERROR: failed to open destination directory %s. %s\n",
dest_dir_full_path, strerror(-ret));
goto out;
}
ret = find_mount_root(dest_dir_full_path, &r->root_path);
if (ret < 0) {
fprintf(stderr,
"ERROR: failed to determine mount point for %s: %s\n",
dest_dir_full_path, strerror(-ret));
ret = -EINVAL;
goto out;
}
if (ret > 0) {
fprintf(stderr,
"ERROR: %s doesn't belong to btrfs mount point\n",
dest_dir_full_path);
ret = -EINVAL;
goto out;
}
r->mnt_fd = open(r->root_path, O_RDONLY | O_NOATIME);
if (r->mnt_fd < 0) {
ret = -errno;
fprintf(stderr, "ERROR: failed to open %s. %s\n", r->root_path,
strerror(-ret));
goto out;
}
/*
* find_mount_root returns a root_path that is a subpath of
* dest_dir_full_path. Now get the other part of root_path,
* which is the destination dir relative to root_path.
*/
r->dest_dir_path = dest_dir_full_path + strlen(r->root_path);
while (r->dest_dir_path[0] == '/')
r->dest_dir_path++;
ret = subvol_uuid_search_init(r->mnt_fd, &r->sus);
if (ret < 0)
goto out;
while (!end) {
ret = btrfs_read_and_process_send_stream(r_fd, &send_ops, r,
r->honor_end_cmd,
max_errors);
if (ret < 0)
goto out;
if (ret)
end = 1;
close_inode_for_write(r);
ret = finish_subvol(r);
if (ret < 0)
goto out;
}
ret = 0;
out:
if (r->write_fd != -1) {
close(r->write_fd);
r->write_fd = -1;
}
free(r->root_path);
r->root_path = NULL;
free(r->write_path);
r->write_path = NULL;
free(r->full_subvol_path);
r->full_subvol_path = NULL;
r->dest_dir_path = NULL;
free(dest_dir_full_path);
if (r->cur_subvol) {
free(r->cur_subvol->path);
free(r->cur_subvol);
r->cur_subvol = NULL;
}
subvol_uuid_search_finit(&r->sus);
if (r->mnt_fd != -1) {
close(r->mnt_fd);
r->mnt_fd = -1;
}
if (r->dest_dir_fd != -1) {
close(r->dest_dir_fd);
r->dest_dir_fd = -1;
}
return ret;
}
static int process_snapshot(const char *path, const u8 *uuid, u64 ctransid,
const u8 *parent_uuid, u64 parent_ctransid,
void *user)
{
int ret;
struct btrfs_receive *r = user;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
struct btrfs_ioctl_vol_args_v2 args_v2;
struct subvol_info *parent_subvol = NULL;
ret = finish_subvol(r);
if (ret < 0)
goto out;
r->cur_subvol = calloc(1, sizeof(*r->cur_subvol));
if (strlen(r->dest_dir_path) == 0)
r->cur_subvol->path = strdup(path);
else
r->cur_subvol->path = path_cat(r->dest_dir_path, path);
free(r->full_subvol_path);
r->full_subvol_path = path_cat3(r->root_path, r->dest_dir_path, path);
fprintf(stdout, "At snapshot %s\n", path);
memcpy(r->cur_subvol->received_uuid, uuid, BTRFS_UUID_SIZE);
r->cur_subvol->stransid = ctransid;
if (g_verbose) {
uuid_unparse((u8*)r->cur_subvol->received_uuid, uuid_str);
fprintf(stderr, "receiving snapshot %s uuid=%s, "
"ctransid=%llu ", path, uuid_str,
r->cur_subvol->stransid);
uuid_unparse(parent_uuid, uuid_str);
fprintf(stderr, "parent_uuid=%s, parent_ctransid=%llu\n",
uuid_str, parent_ctransid);
}
memset(&args_v2, 0, sizeof(args_v2));
strncpy_null(args_v2.name, path);
parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
parent_ctransid, NULL, subvol_search_by_received_uuid);
if (!parent_subvol) {
parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
parent_ctransid, NULL, subvol_search_by_uuid);
}
if (!parent_subvol) {
ret = -ENOENT;
fprintf(stderr, "ERROR: could not find parent subvolume\n");
goto out;
}
/*if (rs_args.ctransid > rs_args.rtransid) {
if (!r->force) {
ret = -EINVAL;
fprintf(stderr, "ERROR: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
goto out;
} else {
fprintf(stderr, "WARNING: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
}
}*/
args_v2.fd = openat(r->mnt_fd, parent_subvol->path,
O_RDONLY | O_NOATIME);
if (args_v2.fd < 0) {
ret = -errno;
if (errno != ENOENT)
fprintf(stderr, "ERROR: open %s failed. %s\n",
parent_subvol->path, strerror(-ret));
else
fprintf(stderr,
"It seems that you have changed your default "
"subvolume or you specify other subvolume to\n"
"mount btrfs, try to remount this btrfs filesystem "
"with fs tree, and run btrfs receive again!\n");
goto out;
}
ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
close(args_v2.fd);
if (ret < 0) {
ret = -errno;
fprintf(stderr, "ERROR: creating snapshot %s -> %s "
"failed. %s\n", parent_subvol->path,
path, strerror(-ret));
goto out;
}
out:
if (parent_subvol) {
free(parent_subvol->path);
free(parent_subvol);
}
return ret;
}
static int process_snapshot(const char *path, const u8 *uuid, u64 ctransid,
const u8 *parent_uuid, u64 parent_ctransid,
void *user)
{
int ret;
struct btrfs_receive *r = user;
char uuid_str[128];
struct btrfs_ioctl_vol_args_v2 args_v2;
ret = finish_subvol(r);
if (ret < 0)
goto out;
r->cur_subvol = calloc(1, sizeof(*r->cur_subvol));
r->parent_subvol = NULL;
r->cur_subvol->path = strdup(path);
r->full_subvol_path = path_cat(r->root_path, path);
fprintf(stderr, "At snapshot %s\n", path);
memcpy(r->cur_subvol->received_uuid, uuid, BTRFS_UUID_SIZE);
r->cur_subvol->stransid = ctransid;
if (g_verbose) {
uuid_unparse((u8*)r->cur_subvol->received_uuid, uuid_str);
fprintf(stderr, "receiving snapshot %s uuid=%s, "
"ctransid=%llu ", path, uuid_str,
r->cur_subvol->stransid);
uuid_unparse(parent_uuid, uuid_str);
fprintf(stderr, "parent_uuid=%s, parent_ctransid=%llu\n",
uuid_str, parent_ctransid);
}
memset(&args_v2, 0, sizeof(args_v2));
strcpy(args_v2.name, path);
r->parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
parent_ctransid, NULL, subvol_search_by_received_uuid);
if (!r->parent_subvol) {
ret = -ENOENT;
fprintf(stderr, "ERROR: could not find parent subvolume\n");
goto out;
}
/*if (rs_args.ctransid > rs_args.rtransid) {
if (!r->force) {
ret = -EINVAL;
fprintf(stderr, "ERROR: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
goto out;
} else {
fprintf(stderr, "WARNING: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
}
}*/
args_v2.fd = openat(r->mnt_fd, r->parent_subvol->path,
O_RDONLY | O_NOATIME);
if (args_v2.fd < 0) {
ret = -errno;
fprintf(stderr, "ERROR: open %s failed. %s\n",
r->parent_subvol->path, strerror(-ret));
goto out;
}
ret = ioctl(r->mnt_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
close(args_v2.fd);
if (ret < 0) {
ret = -errno;
fprintf(stderr, "ERROR: creating snapshot %s -> %s "
"failed. %s\n", r->parent_subvol->path,
path, strerror(-ret));
goto out;
}
out:
return ret;
}
