* Boston, MA 021110-1307, USA.
*/
-#define _GNU_SOURCE
+
+#include "kerncompat.h"
#include <unistd.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
-
+#include <libgen.h>
+#include <mntent.h>
+#include <assert.h>
+#include <getopt.h>
#include <uuid/uuid.h>
+#include <limits.h>
#include "ctree.h"
#include "ioctl.h"
#include "commands.h"
#include "list.h"
+#include "utils.h"
#include "send.h"
#include "send-utils.h"
+#include "help.h"
-static int g_verbose = 0;
+#define SEND_BUFFER_SIZE SZ_64K
+
+/*
+ * Default is 1 for historical reasons, changing may break scripts that expect
+ * the 'At subvol' message.
+ */
+static int g_verbose = 1;
struct btrfs_send {
int send_fd;
struct subvol_uuid_search sus;
};
-int find_mount_root(const char *path, char **mount_root)
-{
- int ret;
- char cur[BTRFS_PATH_NAME_MAX];
- char fsid[BTRFS_FSID_SIZE];
- int fd;
- struct stat st;
- int pos;
- char *tmp;
-
- struct btrfs_ioctl_fs_info_args args;
-
- fd = open(path, O_RDONLY | O_NOATIME);
- if (fd < 0) {
- ret = -errno;
- goto out;
- }
-
- ret = fstat(fd, &st);
- if (fd < 0) {
- ret = -errno;
- goto out;
- }
- if (!S_ISDIR(st.st_mode)) {
- ret = -ENOTDIR;
- goto out;
- }
-
- ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
- if (fd < 0) {
- ret = -errno;
- goto out;
- }
- memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
- close(fd);
- fd = -1;
-
- strcpy(cur, path);
- while (1) {
- tmp = strrchr(cur, '/');
- if (!tmp)
- break;
- if (tmp == cur)
- break;
- pos = tmp - cur;
- cur[pos] = 0;
-
- fd = open(cur, O_RDONLY | O_NOATIME);
- if (fd < 0) {
- ret = -errno;
- goto out;
- }
-
- ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
- close(fd);
- fd = -1;
- if (ret < 0) {
- cur[pos] = '/';
- break;
- }
- if (memcmp(fsid, args.fsid, BTRFS_FSID_SIZE) != 0) {
- cur[pos] = '/';
- break;
- }
- }
-
- ret = 0;
- *mount_root = realpath(cur, NULL);
-
-out:
- if (fd != -1)
- close(fd);
- return ret;
-}
-
-static int get_root_id(struct btrfs_send *s, const char *path, u64 *root_id)
+static int get_root_id(struct btrfs_send *sctx, const char *path, u64 *root_id)
{
struct subvol_info *si;
- si = subvol_uuid_search(&s->sus, 0, NULL, 0, path,
+ si = subvol_uuid_search(&sctx->sus, 0, NULL, 0, path,
subvol_search_by_path);
- if (!si)
- return -ENOENT;
+ if (IS_ERR_OR_NULL(si)) {
+ if (!si)
+ return -ENOENT;
+ else
+ return PTR_ERR(si);
+ }
*root_id = si->root_id;
+ free(si->path);
+ free(si);
return 0;
}
-static struct subvol_info *get_parent(struct btrfs_send *s, u64 root_id)
+static struct subvol_info *get_parent(struct btrfs_send *sctx, u64 root_id)
{
+ struct subvol_info *si_tmp;
struct subvol_info *si;
- si = subvol_uuid_search(&s->sus, root_id, NULL, 0, NULL,
+ si_tmp = subvol_uuid_search(&sctx->sus, root_id, NULL, 0, NULL,
subvol_search_by_root_id);
- if (!si)
- return NULL;
+ if (IS_ERR_OR_NULL(si_tmp))
+ return si_tmp;
- si = subvol_uuid_search(&s->sus, 0, si->parent_uuid, 0, NULL,
+ si = subvol_uuid_search(&sctx->sus, 0, si_tmp->parent_uuid, 0, NULL,
subvol_search_by_uuid);
- if (!si)
- return NULL;
+ free(si_tmp->path);
+ free(si_tmp);
return si;
}
-static int find_good_parent(struct btrfs_send *s, u64 root_id, u64 *found)
+static int find_good_parent(struct btrfs_send *sctx, u64 root_id, u64 *found)
{
int ret;
- struct subvol_info *parent;
- struct subvol_info *parent2;
+ struct subvol_info *parent = NULL;
+ struct subvol_info *parent2 = NULL;
struct subvol_info *best_parent = NULL;
- __s64 tmp;
u64 best_diff = (u64)-1;
int i;
- parent = get_parent(s, root_id);
- if (!parent) {
- ret = -ENOENT;
+ parent = get_parent(sctx, root_id);
+ if (IS_ERR_OR_NULL(parent)) {
+ if (!parent)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(parent);
goto out;
}
- for (i = 0; i < s->clone_sources_count; i++) {
- if (s->clone_sources[i] == parent->root_id) {
+ for (i = 0; i < sctx->clone_sources_count; i++) {
+ if (sctx->clone_sources[i] == parent->root_id) {
best_parent = parent;
+ parent = NULL;
goto out_found;
}
}
- for (i = 0; i < s->clone_sources_count; i++) {
- parent2 = get_parent(s, s->clone_sources[i]);
- if (parent2 != parent)
- continue;
+ for (i = 0; i < sctx->clone_sources_count; i++) {
+ s64 tmp;
- parent2 = subvol_uuid_search(&s->sus, s->clone_sources[i], NULL,
- 0, NULL, subvol_search_by_root_id);
+ parent2 = get_parent(sctx, sctx->clone_sources[i]);
+ if (IS_ERR_OR_NULL(parent2))
+ continue;
+ if (parent2->root_id != parent->root_id) {
+ free(parent2->path);
+ free(parent2);
+ parent2 = NULL;
+ continue;
+ }
+ free(parent2->path);
+ free(parent2);
+ parent2 = subvol_uuid_search(&sctx->sus,
+ sctx->clone_sources[i], NULL, 0, NULL,
+ subvol_search_by_root_id);
+ if (IS_ERR_OR_NULL(parent2)) {
+ if (!parent2)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(parent2);
+ goto out;
+ }
tmp = parent2->ctransid - parent->ctransid;
if (tmp < 0)
- tmp *= -1;
+ tmp = -tmp;
if (tmp < best_diff) {
- best_parent = parent;
+ if (best_parent) {
+ free(best_parent->path);
+ free(best_parent);
+ }
+ best_parent = parent2;
+ parent2 = NULL;
best_diff = tmp;
+ } else {
+ free(parent2->path);
+ free(parent2);
+ parent2 = NULL;
}
}
ret = 0;
out:
+ if (parent) {
+ free(parent->path);
+ free(parent);
+ }
+ if (best_parent) {
+ free(best_parent->path);
+ free(best_parent);
+ }
return ret;
}
-static void add_clone_source(struct btrfs_send *s, u64 root_id)
+static int add_clone_source(struct btrfs_send *sctx, u64 root_id)
{
- s->clone_sources = realloc(s->clone_sources,
- sizeof(*s->clone_sources) * (s->clone_sources_count + 1));
- s->clone_sources[s->clone_sources_count++] = root_id;
+ void *tmp;
+
+ tmp = sctx->clone_sources;
+ sctx->clone_sources = realloc(sctx->clone_sources,
+ sizeof(*sctx->clone_sources) * (sctx->clone_sources_count + 1));
+
+ if (!sctx->clone_sources) {
+ free(tmp);
+ return -ENOMEM;
+ }
+ sctx->clone_sources[sctx->clone_sources_count++] = root_id;
+
+ return 0;
}
-static int write_buf(int fd, const void *buf, int size)
+#if 0
+static int write_buf(int fd, const char *buf, size_t size)
{
int ret;
- int pos = 0;
+ size_t pos = 0;
while (pos < size) {
- ret = write(fd, (char*)buf + pos, size - pos);
- if (ret < 0) {
+ ssize_t wbytes;
+
+ wbytes = write(fd, buf + pos, size - pos);
+ if (wbytes < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: failed to dump stream. %s",
- strerror(-ret));
+ error("failed to dump stream: %s", strerror(-ret));
goto out;
}
- if (!ret) {
+ if (!wbytes) {
ret = -EIO;
- fprintf(stderr, "ERROR: failed to dump stream. %s",
- strerror(-ret));
+ error("failed to dump stream: %s", strerror(-ret));
goto out;
}
- pos += ret;
+ pos += wbytes;
}
ret = 0;
return ret;
}
-static void *dump_thread(void *arg_)
+static void* read_sent_data_copy(void *arg)
{
int ret;
- struct btrfs_send *s = (struct btrfs_send*)arg_;
- char buf[4096];
- int readed;
+ struct btrfs_send *sctx = (struct btrfs_send*)arg;
+ char buf[SEND_BUFFER_SIZE];
while (1) {
- readed = read(s->send_fd, buf, sizeof(buf));
- if (readed < 0) {
+ ssize_t rbytes;
+
+ rbytes = read(sctx->send_fd, buf, sizeof(buf));
+ if (rbytes < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: failed to read stream from "
- "kernel. %s\n", strerror(-ret));
+ error("failed to read stream from kernel: %s",
+ strerror(-ret));
goto out;
}
- if (!readed) {
+ if (!rbytes) {
ret = 0;
goto out;
}
- ret = write_buf(s->dump_fd, buf, readed);
+ ret = write_buf(sctx->dump_fd, buf, rbytes);
if (ret < 0)
goto out;
}
out:
- if (ret < 0) {
+ if (ret < 0)
exit(-ret);
+
+ return ERR_PTR(ret);
+}
+#endif
+
+static void *read_sent_data(void *arg)
+{
+ int ret;
+ struct btrfs_send *sctx = (struct btrfs_send*)arg;
+
+ while (1) {
+ ssize_t sbytes;
+
+ /* Source is a pipe, output is either file or stdout */
+ sbytes = splice(sctx->send_fd, NULL, sctx->dump_fd,
+ NULL, SEND_BUFFER_SIZE, SPLICE_F_MORE);
+ if (sbytes < 0) {
+ ret = -errno;
+ error("failed to read stream from kernel: %s",
+ strerror(-ret));
+ goto out;
+ }
+ if (!sbytes) {
+ ret = 0;
+ goto out;
+ }
}
+out:
+ if (ret < 0)
+ exit(-ret);
+
return ERR_PTR(ret);
}
-static int do_send(struct btrfs_send *send, u64 root_id, u64 parent_root)
+static int do_send(struct btrfs_send *send, u64 parent_root_id,
+ int is_first_subvol, int is_last_subvol, const char *subvol,
+ u64 flags)
{
int ret;
pthread_t t_read;
- pthread_attr_t t_attr;
struct btrfs_ioctl_send_args io_send;
- struct subvol_info *si;
void *t_err = NULL;
int subvol_fd = -1;
- int pipefd[2];
+ int pipefd[2] = {-1, -1};
- si = subvol_uuid_search(&send->sus, root_id, NULL, 0, NULL,
- subvol_search_by_root_id);
- if (!si) {
- ret = -ENOENT;
- fprintf(stderr, "ERROR: could not find subvol info for %llu",
- root_id);
- goto out;
- }
-
- subvol_fd = openat(send->mnt_fd, si->path, O_RDONLY | O_NOATIME);
+ subvol_fd = openat(send->mnt_fd, subvol, O_RDONLY | O_NOATIME);
if (subvol_fd < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: open %s failed. %s\n", si->path,
- strerror(-ret));
+ error("cannot open %s: %s", subvol, strerror(-ret));
goto out;
}
- ret = pthread_attr_init(&t_attr);
-
ret = pipe(pipefd);
if (ret < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: pipe failed. %s\n", strerror(-ret));
+ error("pipe failed: %s", strerror(-ret));
goto out;
}
+ memset(&io_send, 0, sizeof(io_send));
io_send.send_fd = pipefd[1];
send->send_fd = pipefd[0];
if (!ret)
- ret = pthread_create(&t_read, &t_attr, dump_thread,
- send);
+ ret = pthread_create(&t_read, NULL, read_sent_data, send);
if (ret) {
ret = -ret;
- fprintf(stderr, "ERROR: thread setup failed: %s\n",
- strerror(-ret));
+ error("thread setup failed: %s", strerror(-ret));
goto out;
}
+ io_send.flags = flags;
io_send.clone_sources = (__u64*)send->clone_sources;
io_send.clone_sources_count = send->clone_sources_count;
- io_send.parent_root = parent_root;
+ io_send.parent_root = parent_root_id;
+ if (!is_first_subvol)
+ io_send.flags |= BTRFS_SEND_FLAG_OMIT_STREAM_HEADER;
+ if (!is_last_subvol)
+ io_send.flags |= BTRFS_SEND_FLAG_OMIT_END_CMD;
ret = ioctl(subvol_fd, BTRFS_IOC_SEND, &io_send);
- if (ret) {
+ if (ret < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: send ioctl failed with %d: %s\n", ret,
- strerror(-ret));
+ error("send ioctl failed with %d: %s", ret, strerror(-ret));
+ if (ret == -EINVAL && (!is_first_subvol || !is_last_subvol))
+ fprintf(stderr,
+ "Try upgrading your kernel or don't use -e.\n");
goto out;
}
- if (g_verbose > 0)
+ if (g_verbose > 1)
fprintf(stderr, "BTRFS_IOC_SEND returned %d\n", ret);
- if (g_verbose > 0)
+ if (g_verbose > 1)
fprintf(stderr, "joining genl thread\n");
close(pipefd[1]);
- pipefd[1] = 0;
+ pipefd[1] = -1;
ret = pthread_join(t_read, &t_err);
if (ret) {
ret = -ret;
- fprintf(stderr, "ERROR: pthread_join failed: %s\n",
- strerror(-ret));
+ error("pthread_join failed: %s", strerror(-ret));
goto out;
}
if (t_err) {
ret = (long int)t_err;
- fprintf(stderr, "ERROR: failed to process send stream, ret=%ld "
- "(%s)\n", (long int)t_err, strerror(-ret));
+ error("failed to process send stream, ret=%ld (%s)",
+ (long int)t_err, strerror(-ret));
goto out;
}
- pthread_attr_destroy(&t_attr);
-
ret = 0;
out:
if (subvol_fd != -1)
close(subvol_fd);
- if (pipefd[0])
+ if (pipefd[0] != -1)
close(pipefd[0]);
- if (pipefd[1])
+ if (pipefd[1] != -1)
close(pipefd[1]);
return ret;
}
-static const char *get_subvol_name(struct btrfs_send *s, const char *full_path)
-{
- return full_path + strlen(s->root_path) + 1;
-}
-
-static int init_root_path(struct btrfs_send *s, const char *subvol)
+static int init_root_path(struct btrfs_send *sctx, const char *subvol)
{
int ret = 0;
- if (s->root_path)
+ if (sctx->root_path)
goto out;
- ret = find_mount_root(subvol, &s->root_path);
+ ret = find_mount_root(subvol, &sctx->root_path);
if (ret < 0) {
+ error("failed to determine mount point for %s: %s",
+ subvol, strerror(-ret));
+ ret = -EINVAL;
+ goto out;
+ }
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point", subvol);
ret = -EINVAL;
- fprintf(stderr, "ERROR: failed to determine mount point "
- "for %s\n", subvol);
goto out;
}
- s->mnt_fd = open(s->root_path, O_RDONLY | O_NOATIME);
- if (s->mnt_fd < 0) {
+ sctx->mnt_fd = open(sctx->root_path, O_RDONLY | O_NOATIME);
+ if (sctx->mnt_fd < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: can't open '%s': %s\n", s->root_path,
- strerror(-ret));
+ error("cannot open '%s': %s", sctx->root_path, strerror(-ret));
goto out;
}
- ret = subvol_uuid_search_init(s->mnt_fd, &s->sus);
+ ret = subvol_uuid_search_init(sctx->mnt_fd, &sctx->sus);
if (ret < 0) {
- fprintf(stderr, "ERROR: failed to initialize subvol search. "
- "%s\n", strerror(-ret));
+ error("failed to initialize subvol search: %s",
+ strerror(-ret));
goto out;
}
}
-static int is_subvol_ro(struct btrfs_send *s, char *subvol)
+static int is_subvol_ro(struct btrfs_send *sctx, const char *subvol)
{
int ret;
u64 flags;
int fd = -1;
- fd = openat(s->mnt_fd, subvol, O_RDONLY | O_NOATIME);
+ fd = openat(sctx->mnt_fd, subvol, O_RDONLY | O_NOATIME);
if (fd < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: failed to open %s. %s\n",
- subvol, strerror(-ret));
+ error("cannot open %s: %s", subvol, strerror(-ret));
goto out;
}
ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
if (ret < 0) {
ret = -errno;
- fprintf(stderr, "ERROR: failed to get flags for subvolume. "
- "%s\n", strerror(-ret));
+ error("failed to get flags for subvolume %s: %s",
+ subvol, strerror(-ret));
goto out;
}
return ret;
}
-int cmd_send_start(int argc, char **argv)
+static int set_root_info(struct btrfs_send *sctx, const char *subvol,
+ u64 *root_id)
+{
+ int ret;
+
+ ret = init_root_path(sctx, subvol);
+ if (ret < 0)
+ goto out;
+
+ ret = get_root_id(sctx, subvol_strip_mountpoint(sctx->root_path, subvol),
+ root_id);
+ if (ret < 0) {
+ error("cannot resolve rootid for %s", subvol);
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static void free_send_info(struct btrfs_send *sctx)
+{
+ if (sctx->mnt_fd >= 0) {
+ close(sctx->mnt_fd);
+ sctx->mnt_fd = -1;
+ }
+ free(sctx->root_path);
+ sctx->root_path = NULL;
+ subvol_uuid_search_finit(&sctx->sus);
+}
+
+int cmd_send(int argc, char **argv)
{
char *subvol = NULL;
- char c;
int ret;
- char *outname = NULL;
+ char outname[PATH_MAX];
struct btrfs_send send;
u32 i;
char *mount_root = NULL;
char *snapshot_parent = NULL;
- u64 root_id;
+ u64 root_id = 0;
u64 parent_root_id = 0;
+ int full_send = 1;
+ int new_end_cmd_semantic = 0;
+ u64 send_flags = 0;
memset(&send, 0, sizeof(send));
send.dump_fd = fileno(stdout);
+ outname[0] = 0;
+
+ while (1) {
+ enum { GETOPT_VAL_SEND_NO_DATA = 256 };
+ static const struct option long_options[] = {
+ { "verbose", no_argument, NULL, 'v' },
+ { "quiet", no_argument, NULL, 'q' },
+ { "no-data", no_argument, NULL, GETOPT_VAL_SEND_NO_DATA }
+ };
+ int c = getopt_long(argc, argv, "vqec:f:i:p:", long_options, NULL);
+
+ if (c < 0)
+ break;
- while ((c = getopt(argc, argv, "vf:i:p:")) != -1) {
switch (c) {
case 'v':
g_verbose++;
break;
- case 'i': {
+ case 'q':
+ g_verbose = 0;
+ break;
+ case 'e':
+ new_end_cmd_semantic = 1;
+ break;
+ case 'c':
subvol = realpath(optarg, NULL);
if (!subvol) {
ret = -errno;
- fprintf(stderr, "ERROR: realpath %s failed. "
- "%s\n", optarg, strerror(-ret));
+ error("realpath %s failed: %s\n", optarg, strerror(-ret));
goto out;
}
- ret = init_root_path(&send, subvol);
+ ret = set_root_info(&send, subvol, &root_id);
+ if (ret < 0)
+ goto out;
+
+ ret = is_subvol_ro(&send, subvol);
if (ret < 0)
goto out;
+ if (!ret) {
+ ret = -EINVAL;
+ error("cloned subvolume %s is not read-only", subvol);
+ goto out;
+ }
- ret = get_root_id(&send, get_subvol_name(&send, subvol),
- &root_id);
+ ret = add_clone_source(&send, root_id);
if (ret < 0) {
- fprintf(stderr, "ERROR: could not resolve "
- "root_id for %s\n", subvol);
+ error("cannot add clone source: %s", strerror(-ret));
goto out;
}
- add_clone_source(&send, root_id);
free(subvol);
+ subvol = NULL;
+ free_send_info(&send);
+ full_send = 0;
break;
- }
case 'f':
- outname = optarg;
+ if (arg_copy_path(outname, optarg, sizeof(outname))) {
+ error("output file path too long (%zu)", strlen(optarg));
+ ret = 1;
+ goto out;
+ }
break;
case 'p':
+ if (snapshot_parent) {
+ error("you cannot have more than one parent (-p)");
+ ret = 1;
+ goto out;
+ }
snapshot_parent = realpath(optarg, NULL);
if (!snapshot_parent) {
ret = -errno;
- fprintf(stderr, "ERROR: realpath %s failed. "
- "%s\n", optarg, strerror(-ret));
+ error("realpath %s failed: %s", optarg, strerror(-ret));
goto out;
}
+
+ ret = is_subvol_ro(&send, snapshot_parent);
+ if (ret < 0)
+ goto out;
+ if (!ret) {
+ ret = -EINVAL;
+ error("parent subvolume %s is not read-only",
+ snapshot_parent);
+ goto out;
+ }
+
+ full_send = 0;
+ break;
+ case 'i':
+ error("option -i was removed, use -c instead");
+ ret = 1;
+ goto out;
+ case GETOPT_VAL_SEND_NO_DATA:
+ send_flags |= BTRFS_SEND_FLAG_NO_FILE_DATA;
break;
case '?':
default:
- fprintf(stderr, "ERROR: send args invalid.\n");
- return 1;
+ error("send arguments invalid");
+ ret = 1;
+ goto out;
}
}
- if (optind == argc) {
- fprintf(stderr, "ERROR: send needs path to snapshot\n");
- return 1;
- }
-
- if (outname != NULL) {
- send.dump_fd = creat(outname, 0600);
+ if (check_argc_min(argc - optind, 1))
+ usage(cmd_send_usage);
+
+ if (outname[0]) {
+ int tmpfd;
+
+ /*
+ * Try to use an existing file first. Even if send runs as
+ * root, it might not have permissions to create file (eg. on a
+ * NFS) but it should still be able to use a pre-created file.
+ */
+ tmpfd = open(outname, O_WRONLY | O_TRUNC);
+ if (tmpfd < 0) {
+ if (errno == ENOENT)
+ tmpfd = open(outname,
+ O_CREAT | O_WRONLY | O_TRUNC, 0600);
+ }
+ send.dump_fd = tmpfd;
if (send.dump_fd == -1) {
ret = -errno;
- fprintf(stderr, "ERROR: can't create '%s': %s\n",
- outname, strerror(-ret));
+ error("cannot create '%s': %s", outname, strerror(-ret));
goto out;
}
}
+ if (isatty(send.dump_fd)) {
+ error(
+ "not dumping send stream into a terminal, redirect it into a file");
+ ret = 1;
+ goto out;
+ }
+
/* use first send subvol to determine mount_root */
- subvol = argv[optind];
+ subvol = realpath(argv[optind], NULL);
+ if (!subvol) {
+ ret = -errno;
+ error("unable to resolve %s", argv[optind]);
+ goto out;
+ }
ret = init_root_path(&send, subvol);
if (ret < 0)
if (snapshot_parent != NULL) {
ret = get_root_id(&send,
- get_subvol_name(&send, snapshot_parent),
- &parent_root_id);
+ subvol_strip_mountpoint(send.root_path, snapshot_parent),
+ &parent_root_id);
if (ret < 0) {
- fprintf(stderr, "ERROR: could not resolve root_id "
- "for %s\n", snapshot_parent);
+ error("could not resolve rootid for %s", snapshot_parent);
goto out;
}
- add_clone_source(&send, parent_root_id);
+ ret = add_clone_source(&send, parent_root_id);
+ if (ret < 0) {
+ error("cannot add clone source: %s", strerror(-ret));
+ goto out;
+ }
}
for (i = optind; i < argc; i++) {
- subvol = argv[i];
+ free(subvol);
+ subvol = realpath(argv[i], NULL);
+ if (!subvol) {
+ ret = -errno;
+ error("unable to resolve %s", argv[i]);
+ goto out;
+ }
ret = find_mount_root(subvol, &mount_root);
if (ret < 0) {
- fprintf(stderr, "ERROR: find_mount_root failed on %s: "
- "%s\n", subvol,
+ error("find_mount_root failed on %s: %s", subvol,
strerror(-ret));
goto out;
}
+ if (ret > 0) {
+ error("%s does not belong to btrfs mount point",
+ subvol);
+ ret = -EINVAL;
+ goto out;
+ }
if (strcmp(send.root_path, mount_root) != 0) {
ret = -EINVAL;
- fprintf(stderr, "ERROR: all subvols must be from the "
- "same fs.\n");
+ error("all subvolumes must be from the same filesystem");
goto out;
}
free(mount_root);
goto out;
if (!ret) {
ret = -EINVAL;
- fprintf(stderr, "ERROR: %s is not read-only.\n",
- subvol);
+ error("subvolume %s is not read-only", subvol);
goto out;
}
}
+ if ((send_flags & BTRFS_SEND_FLAG_NO_FILE_DATA) && g_verbose > 1)
+ if (g_verbose > 1)
+ fprintf(stderr, "Mode NO_FILE_DATA enabled\n");
+
for (i = optind; i < argc; i++) {
+ int is_first_subvol;
+ int is_last_subvol;
+
+ free(subvol);
subvol = argv[i];
- fprintf(stderr, "At subvol %s\n", subvol);
+ if (g_verbose > 0)
+ fprintf(stderr, "At subvol %s\n", subvol);
subvol = realpath(subvol, NULL);
if (!subvol) {
ret = -errno;
- fprintf(stderr, "ERROR: realpath %s failed. "
- "%s\n", argv[i], strerror(-ret));
+ error("realpath %s failed: %s", argv[i], strerror(-ret));
goto out;
}
- ret = get_root_id(&send, get_subvol_name(&send, subvol),
- &root_id);
- if (ret < 0) {
- fprintf(stderr, "ERROR: could not resolve root_id "
- "for %s\n", subvol);
- goto out;
- }
+ if (!full_send && !snapshot_parent) {
+ ret = set_root_info(&send, subvol, &root_id);
+ if (ret < 0)
+ goto out;
- if (!parent_root_id) {
ret = find_good_parent(&send, root_id, &parent_root_id);
- if (ret < 0)
- parent_root_id = 0;
+ if (ret < 0) {
+ error("parent determination failed for %lld",
+ root_id);
+ goto out;
+ }
}
- ret = is_subvol_ro(&send, subvol);
- if (ret < 0)
- goto out;
- if (!ret) {
- ret = -EINVAL;
- fprintf(stderr, "ERROR: %s is not read-only.\n",
- subvol);
- goto out;
+ if (new_end_cmd_semantic) {
+ /* require new kernel */
+ is_first_subvol = (i == optind);
+ is_last_subvol = (i == argc - 1);
+ } else {
+ /* be compatible to old and new kernel */
+ is_first_subvol = 1;
+ is_last_subvol = 1;
}
-
- ret = do_send(&send, root_id, parent_root_id);
+ ret = do_send(&send, parent_root_id, is_first_subvol,
+ is_last_subvol, subvol, send_flags);
if (ret < 0)
goto out;
- /* done with this subvol, so add it to the clone sources */
- add_clone_source(&send, root_id);
-
- parent_root_id = 0;
- free(subvol);
+ if (!full_send && !snapshot_parent) {
+ /* done with this subvol, so add it to the clone sources */
+ ret = add_clone_source(&send, root_id);
+ if (ret < 0) {
+ error("cannot add clone source: %s", strerror(-ret));
+ goto out;
+ }
+ free_send_info(&send);
+ }
}
ret = 0;
out:
- if (send.mnt_fd >= 0)
- close(send.mnt_fd);
- return ret;
+ free(subvol);
+ free(snapshot_parent);
+ free(send.clone_sources);
+ free_send_info(&send);
+ return !!ret;
}
-static const char * const send_cmd_group_usage[] = {
- "btrfs send <command> <args>",
- NULL
-};
-
-static const char * const cmd_send_usage[] = {
- "btrfs send [-v] [-i <subvol>] [-p <parent>] <subvol>",
- "Send the subvolume to stdout.",
- "Sends the subvolume specified by <subvol> to stdout.",
- "By default, this will send the whole subvolume. To do",
- "an incremental send, one or multiple '-i <clone_source>'",
- "arguments have to be specified. A 'clone source' is",
- "a subvolume that is known to exist on the receiving",
- "side in exactly the same state as on the sending side.\n",
- "Normally, a good snapshot parent is searched automatically",
- "in the list of 'clone sources'. To override this, use",
- "'-p <parent>' to manually specify a snapshot parent.",
- "A manually specified snapshot parent is also regarded",
- "as 'clone source'.\n",
- "-v Enable verbose debug output. Each",
- " occurrency of this option increases the",
- " verbose level more.",
- "-i <subvol> Informs btrfs send that this subvolume,",
- " can be taken as 'clone source'. This can",
- " be used for incremental sends.",
- "-p <subvol> Disable automatic snaphot parent",
- " determination and use <subvol> as parent.",
- " This subvolume is also added to the list",
- " of 'clone sources' (see -i).",
- "-f <outfile> Output is normally written to stdout.",
- " To write to a file, use this option.",
- " An alternative would be to use pipes.",
+const char * const cmd_send_usage[] = {
+ "btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] <subvol> [<subvol>...]",
+ "Send the subvolume(s) to stdout.",
+ "Sends the subvolume(s) specified by <subvol> to stdout.",
+ "<subvol> should be read-only here.",
+ "By default, this will send the whole subvolume. To do an incremental",
+ "send, use '-p <parent>'. If you want to allow btrfs to clone from",
+ "any additional local snapshots, use '-c <clone-src>' (multiple times",
+ "where applicable). You must not specify clone sources unless you",
+ "guarantee that these snapshots are exactly in the same state on both",
+ "sides, the sender and the receiver. It is allowed to omit the",
+ "'-p <parent>' option when '-c <clone-src>' options are given, in",
+ "which case 'btrfs send' will determine a suitable parent among the",
+ "clone sources itself.",
+ "\n",
+ "-e If sending multiple subvols at once, use the new",
+ " format and omit the end-cmd between the subvols.",
+ "-p <parent> Send an incremental stream from <parent> to",
+ " <subvol>.",
+ "-c <clone-src> Use this snapshot as a clone source for an ",
+ " incremental send (multiple allowed)",
+ "-f <outfile> Output is normally written to stdout. To write to",
+ " a file, use this option. An alternative would be to",
+ " use pipes.",
+ "--no-data send in NO_FILE_DATA mode, Note: the output stream",
+ " does not contain any file data and thus cannot be used",
+ " to transfer changes. This mode is faster and useful to",
+ " show the differences in metadata.",
+ "-v|--verbose enable verbose output to stderr, each occurrence of",
+ " this option increases verbosity",
+ "-q|--quiet suppress all messages, except errors",
NULL
};
-
-const struct cmd_group send_cmd_group = {
- send_cmd_group_usage, NULL, {
- { "send", cmd_send_start, cmd_send_usage, NULL, 0 },
- { 0, 0, 0, 0, 0 },
- },
-};
-
-int cmd_send(int argc, char **argv)
-{
- return cmd_send_start(argc, argv);
-}
projects / platform / upstream / btrfs-progs.git / blobdiff