#include "send.h"
#include "send-stream.h"
#include "send-utils.h"
+#include "send-dump.h"
+#include "help.h"
static int g_verbose = 0;
int cached_capabilities_len;
};
-static int finish_subvol(struct btrfs_receive *r)
+static int finish_subvol(struct btrfs_receive *rctx)
{
int ret;
int subvol_fd = -1;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
u64 flags;
- if (r->cur_subvol_path[0] == 0)
+ if (rctx->cur_subvol_path[0] == 0)
return 0;
- subvol_fd = openat(r->mnt_fd, r->cur_subvol_path,
- O_RDONLY | O_NOATIME);
+ subvol_fd = openat(rctx->mnt_fd, rctx->cur_subvol_path,
+ O_RDONLY | O_NOATIME);
if (subvol_fd < 0) {
ret = -errno;
- error("cannot open %s: %s\n",
- r->cur_subvol_path, strerror(-ret));
+ error("cannot open %s: %s",
+ rctx->cur_subvol_path, strerror(-ret));
goto out;
}
memset(&rs_args, 0, sizeof(rs_args));
- memcpy(rs_args.uuid, r->cur_subvol.received_uuid, BTRFS_UUID_SIZE);
- rs_args.stransid = r->cur_subvol.stransid;
+ memcpy(rs_args.uuid, rctx->cur_subvol.received_uuid, BTRFS_UUID_SIZE);
+ rs_args.stransid = rctx->cur_subvol.stransid;
if (g_verbose >= 1) {
uuid_unparse((u8*)rs_args.uuid, uuid_str);
strerror(-ret));
goto out;
}
- r->cur_subvol.rtransid = rs_args.rtransid;
+ rctx->cur_subvol.rtransid = rs_args.rtransid;
ret = ioctl(subvol_fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
if (ret < 0) {
ret = 0;
out:
- if (r->cur_subvol_path[0]) {
- r->cur_subvol_path[0] = 0;
+ if (rctx->cur_subvol_path[0]) {
+ rctx->cur_subvol_path[0] = 0;
}
if (subvol_fd != -1)
close(subvol_fd);
void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
struct btrfs_ioctl_vol_args args_v1;
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
- ret = finish_subvol(r);
+ ret = finish_subvol(rctx);
if (ret < 0)
goto out;
- BUG_ON(r->cur_subvol.path);
- BUG_ON(r->cur_subvol_path[0]);
+ if (rctx->cur_subvol.path) {
+ error("subvol: another one already started, path ptr: %s",
+ rctx->cur_subvol.path);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (rctx->cur_subvol_path[0]) {
+ error("subvol: another one already started, path buf: %s",
+ rctx->cur_subvol.path);
+ ret = -EINVAL;
+ goto out;
+ }
- if (*r->dest_dir_path == 0) {
- strncpy_null(r->cur_subvol_path, path);
+ if (*rctx->dest_dir_path == 0) {
+ strncpy_null(rctx->cur_subvol_path, path);
} else {
- ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
+ ret = path_cat_out(rctx->cur_subvol_path, rctx->dest_dir_path,
+ path);
if (ret < 0) {
- error("subvol: path invalid: %s\n", path);
+ error("subvol: path invalid: %s", path);
goto out;
}
}
- ret = path_cat3_out(r->full_subvol_path, r->root_path,
- r->dest_dir_path, path);
+ ret = path_cat3_out(rctx->full_subvol_path, rctx->root_path,
+ rctx->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;
+ memcpy(rctx->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
+ rctx->cur_subvol.stransid = ctransid;
if (g_verbose) {
- uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
+ uuid_unparse((u8*)rctx->cur_subvol.received_uuid, uuid_str);
fprintf(stderr, "receiving subvol %s uuid=%s, stransid=%llu\n",
path, uuid_str,
- r->cur_subvol.stransid);
+ rctx->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);
+ ret = ioctl(rctx->dest_dir_fd, BTRFS_IOC_SUBVOL_CREATE, &args_v1);
if (ret < 0) {
ret = -errno;
error("creating subvolume %s failed: %s", path, strerror(-ret));
void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = 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);
+ ret = finish_subvol(rctx);
if (ret < 0)
goto out;
- BUG_ON(r->cur_subvol.path);
- BUG_ON(r->cur_subvol_path[0]);
+ if (rctx->cur_subvol.path) {
+ error("snapshot: another one already started, path ptr: %s",
+ rctx->cur_subvol.path);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (rctx->cur_subvol_path[0]) {
+ error("snapshot: another one already started, path buf: %s",
+ rctx->cur_subvol.path);
+ ret = -EINVAL;
+ goto out;
+ }
- if (*r->dest_dir_path == 0) {
- strncpy_null(r->cur_subvol_path, path);
+ if (*rctx->dest_dir_path == 0) {
+ strncpy_null(rctx->cur_subvol_path, path);
} else {
- ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
+ ret = path_cat_out(rctx->cur_subvol_path, rctx->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);
+ ret = path_cat3_out(rctx->full_subvol_path, rctx->root_path,
+ rctx->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;
+ memcpy(rctx->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
+ rctx->cur_subvol.stransid = ctransid;
if (g_verbose) {
- uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
+ uuid_unparse((u8*)rctx->cur_subvol.received_uuid, uuid_str);
fprintf(stderr, "receiving snapshot %s uuid=%s, "
"ctransid=%llu ", path, uuid_str,
- r->cur_subvol.stransid);
+ rctx->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);
+ parent_subvol = subvol_uuid_search(&rctx->sus, 0, parent_uuid,
+ parent_ctransid, NULL,
+ subvol_search_by_received_uuid);
+ if (IS_ERR_OR_NULL(parent_subvol)) {
+ parent_subvol = subvol_uuid_search(&rctx->sus, 0, parent_uuid,
+ parent_ctransid, NULL,
+ subvol_search_by_uuid);
}
- if (!parent_subvol) {
- ret = -ENOENT;
+ if (IS_ERR_OR_NULL(parent_subvol)) {
+ if (!parent_subvol)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(parent_subvol);
error("cannot find parent subvolume");
goto out;
}
* subvolume under the root subvolume, so try and adjust the path to be
* relative to our root path.
*/
- if (r->full_root_path) {
+ if (rctx->full_root_path) {
size_t root_len;
size_t sub_len;
- root_len = strlen(r->full_root_path);
+ root_len = strlen(rctx->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) {
+ if (strstr(parent_subvol->path, rctx->full_root_path) != parent_subvol->path ||
+ (sub_len > root_len && parent_subvol->path[root_len] != '/')) {
error(
"parent subvol is not reachable from inside the root subvol");
ret = -ENOENT;
}
if (sub_len == root_len) {
- parent_subvol->path[0] = '/';
+ parent_subvol->path[0] = '.';
parent_subvol->path[1] = '\0';
} else {
/*
}*/
if (*parent_subvol->path == 0)
- args_v2.fd = dup(r->mnt_fd);
+ args_v2.fd = dup(rctx->mnt_fd);
else
- args_v2.fd = openat(r->mnt_fd, parent_subvol->path,
- O_RDONLY | O_NOATIME);
+ args_v2.fd = openat(rctx->mnt_fd, parent_subvol->path,
+ O_RDONLY | O_NOATIME);
if (args_v2.fd < 0) {
ret = -errno;
if (errno != ENOENT)
goto out;
}
- ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
+ ret = ioctl(rctx->dest_dir_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
close(args_v2.fd);
if (ret < 0) {
ret = -errno;
static int process_mkfile(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("mkfile: path invalid: %s", path);
goto out;
static int process_mkdir(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("mkdir: path invalid: %s", path);
goto out;
static int process_mknod(const char *path, u64 mode, u64 dev, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("mknod: path invalid: %s", path);
goto out;
static int process_mkfifo(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("mkfifo: path invalid: %s", path);
goto out;
static int process_mksock(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("mksock: path invalid: %s", path);
goto out;
static int process_symlink(const char *path, const char *lnk, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("symlink: path invalid: %s", path);
goto out;
static int process_rename(const char *from, const char *to, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_from[PATH_MAX];
char full_to[PATH_MAX];
- ret = path_cat_out(full_from, r->full_subvol_path, from);
+ ret = path_cat_out(full_from, rctx->full_subvol_path, from);
if (ret < 0) {
error("rename: source path invalid: %s", from);
goto out;
}
- ret = path_cat_out(full_to, r->full_subvol_path, to);
+ ret = path_cat_out(full_to, rctx->full_subvol_path, to);
if (ret < 0) {
error("rename: target path invalid: %s", to);
goto out;
static int process_link(const char *path, const char *lnk, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
char full_link_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("link: source path invalid: %s", full_path);
goto out;
}
- ret = path_cat_out(full_link_path, r->full_subvol_path, lnk);
+ ret = path_cat_out(full_link_path, rctx->full_subvol_path, lnk);
if (ret < 0) {
error("link: target path invalid: %s", full_link_path);
goto out;
static int process_unlink(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("unlink: path invalid: %s", path);
goto out;
static int process_rmdir(const char *path, void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("rmdir: path invalid: %s", path);
goto out;
return ret;
}
-static int open_inode_for_write(struct btrfs_receive *r, const char *path)
+static int open_inode_for_write(struct btrfs_receive *rctx, const char *path)
{
int ret = 0;
- if (r->write_fd != -1) {
- if (strcmp(r->write_path, path) == 0)
+ if (rctx->write_fd != -1) {
+ if (strcmp(rctx->write_path, path) == 0)
goto out;
- close(r->write_fd);
- r->write_fd = -1;
+ close(rctx->write_fd);
+ rctx->write_fd = -1;
}
- r->write_fd = open(path, O_RDWR);
- if (r->write_fd < 0) {
+ rctx->write_fd = open(path, O_RDWR);
+ if (rctx->write_fd < 0) {
ret = -errno;
error("cannot open %s: %s", path, strerror(-ret));
goto out;
}
- strncpy_null(r->write_path, path);
+ strncpy_null(rctx->write_path, path);
out:
return ret;
}
-static void close_inode_for_write(struct btrfs_receive *r)
+static void close_inode_for_write(struct btrfs_receive *rctx)
{
- if(r->write_fd == -1)
+ if(rctx->write_fd == -1)
return;
- close(r->write_fd);
- r->write_fd = -1;
- r->write_path[0] = 0;
+ close(rctx->write_fd);
+ rctx->write_fd = -1;
+ rctx->write_path[0] = 0;
}
static int process_write(const char *path, const void *data, u64 offset,
u64 len, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
u64 pos = 0;
int w;
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("write: path invalid: %s", path);
goto out;
}
- ret = open_inode_for_write(r, full_path);
+ ret = open_inode_for_write(rctx, full_path);
if (ret < 0)
goto out;
while (pos < len) {
- w = pwrite(r->write_fd, (char*)data + pos, len - pos,
+ w = pwrite(rctx->write_fd, (char*)data + pos, len - pos,
offset + pos);
if (w < 0) {
ret = -errno;
- error("writing to %s failed: %s\n",
+ error("writing to %s failed: %s",
path, strerror(-ret));
goto out;
}
void *user)
{
int ret;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
struct btrfs_ioctl_clone_range_args clone_args;
struct subvol_info *si = NULL;
char full_path[PATH_MAX];
char full_clone_path[PATH_MAX];
int clone_fd = -1;
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("clone: source path invalid: %s", path);
goto out;
}
- ret = open_inode_for_write(r, full_path);
+ ret = open_inode_for_write(rctx, full_path);
if (ret < 0)
goto out;
- si = subvol_uuid_search(&r->sus, 0, clone_uuid, clone_ctransid, NULL,
- subvol_search_by_received_uuid);
- if (!si) {
- if (memcmp(clone_uuid, r->cur_subvol.received_uuid,
+ si = subvol_uuid_search(&rctx->sus, 0, clone_uuid, clone_ctransid,
+ NULL,
+ subvol_search_by_received_uuid);
+ if (IS_ERR_OR_NULL(si)) {
+ if (memcmp(clone_uuid, rctx->cur_subvol.received_uuid,
BTRFS_UUID_SIZE) == 0) {
/* TODO check generation of extent */
- subvol_path = strdup(r->cur_subvol_path);
+ subvol_path = strdup(rctx->cur_subvol_path);
} else {
- ret = -ENOENT;
+ if (!si)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(si);
error("clone: did not find source subvol");
goto out;
}
r->subvol_parent_name);
}
}*/
- subvol_path = strdup(si->path);
+
+ /* strip the subvolume that we are receiving to from the start of subvol_path */
+ if (rctx->full_root_path) {
+ size_t root_len = strlen(rctx->full_root_path);
+ size_t sub_len = strlen(si->path);
+
+ if (sub_len > root_len &&
+ strstr(si->path, rctx->full_root_path) == si->path &&
+ si->path[root_len] == '/') {
+ subvol_path = strdup(si->path + root_len + 1);
+ } else {
+ error("clone: source subvol path %s unreachable from %s",
+ si->path, rctx->full_root_path);
+ goto out;
+ }
+ } else {
+ subvol_path = strdup(si->path);
+ }
}
ret = path_cat_out(full_clone_path, subvol_path, clone_path);
goto out;
}
- clone_fd = openat(r->mnt_fd, full_clone_path, O_RDONLY | O_NOATIME);
+ clone_fd = openat(rctx->mnt_fd, full_clone_path, O_RDONLY | O_NOATIME);
if (clone_fd < 0) {
ret = -errno;
error("cannot open %s: %s", full_clone_path, strerror(-ret));
clone_args.src_offset = clone_offset;
clone_args.src_length = len;
clone_args.dest_offset = offset;
- ret = ioctl(r->write_fd, BTRFS_IOC_CLONE_RANGE, &clone_args);
+ ret = ioctl(rctx->write_fd, BTRFS_IOC_CLONE_RANGE, &clone_args);
if (ret < 0) {
ret = -errno;
- error("failed to clone extents to %s\n%s\n",
+ error("failed to clone extents to %s\n%s",
path, strerror(-ret));
goto out;
}
const void *data, int len, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("set_xattr: path invalid: %s", path);
goto out;
if (strcmp("security.capability", name) == 0) {
if (g_verbose >= 3)
fprintf(stderr, "set_xattr: cache capabilities\n");
- if (r->cached_capabilities_len)
+ if (rctx->cached_capabilities_len)
warning("capabilities set multiple times per file: %s",
full_path);
- if (len > sizeof(r->cached_capabilities)) {
+ if (len > sizeof(rctx->cached_capabilities)) {
error("capabilities encoded to %d bytes, buffer too small",
len);
ret = -E2BIG;
goto out;
}
- r->cached_capabilities_len = len;
- memcpy(r->cached_capabilities, data, len);
+ rctx->cached_capabilities_len = len;
+ memcpy(rctx->cached_capabilities, data, len);
}
if (g_verbose >= 2) {
static int process_remove_xattr(const char *path, const char *name, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("remove_xattr: path invalid: %s", path);
goto out;
static int process_truncate(const char *path, u64 size, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("truncate: path invalid: %s", path);
goto out;
static int process_chmod(const char *path, u64 mode, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("chmod: path invalid: %s", path);
goto out;
static int process_chown(const char *path, u64 uid, u64 gid, void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("chown: path invalid: %s", path);
goto out;
goto out;
}
- if (r->cached_capabilities_len) {
+ if (rctx->cached_capabilities_len) {
if (g_verbose >= 2)
fprintf(stderr, "chown: restore capabilities\n");
ret = lsetxattr(full_path, "security.capability",
- r->cached_capabilities,
- r->cached_capabilities_len, 0);
- memset(r->cached_capabilities, 0,
- sizeof(r->cached_capabilities));
- r->cached_capabilities_len = 0;
+ rctx->cached_capabilities,
+ rctx->cached_capabilities_len, 0);
+ memset(rctx->cached_capabilities, 0,
+ sizeof(rctx->cached_capabilities));
+ rctx->cached_capabilities_len = 0;
if (ret < 0) {
ret = -errno;
error("restoring capabilities %s: %s",
void *user)
{
int ret = 0;
- struct btrfs_receive *r = user;
+ struct btrfs_receive *rctx = user;
char full_path[PATH_MAX];
struct timespec tv[2];
- ret = path_cat_out(full_path, r->full_subvol_path, path);
+ ret = path_cat_out(full_path, rctx->full_subvol_path, path);
if (ret < 0) {
error("utimes: path invalid: %s", path);
goto out;
.update_extent = process_update_extent,
};
-static int do_receive(struct btrfs_receive *r, const char *tomnt,
+static int do_receive(struct btrfs_receive *rctx, const char *tomnt,
char *realmnt, int r_fd, u64 max_errors)
{
u64 subvol_id;
char *dest_dir_full_path;
char root_subvol_path[PATH_MAX];
int end = 0;
+ int iterations = 0;
dest_dir_full_path = realpath(tomnt, NULL);
if (!dest_dir_full_path) {
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) {
+ rctx->dest_dir_fd = open(dest_dir_full_path, O_RDONLY | O_NOATIME);
+ if (rctx->dest_dir_fd < 0) {
ret = -errno;
error("cannot open destination directory %s: %s",
dest_dir_full_path, strerror(-ret));
}
if (realmnt[0]) {
- r->root_path = realmnt;
+ rctx->root_path = realmnt;
} else {
- ret = find_mount_root(dest_dir_full_path, &r->root_path);
+ ret = find_mount_root(dest_dir_full_path, &rctx->root_path);
if (ret < 0) {
error("failed to determine mount point for %s: %s",
dest_dir_full_path, strerror(-ret));
goto out;
}
}
- r->mnt_fd = open(r->root_path, O_RDONLY | O_NOATIME);
- if (r->mnt_fd < 0) {
+ rctx->mnt_fd = open(rctx->root_path, O_RDONLY | O_NOATIME);
+ if (rctx->mnt_fd < 0) {
ret = -errno;
- error("cannot open %s: %s", r->root_path, strerror(-ret));
+ error("cannot open %s: %s", rctx->root_path, strerror(-ret));
goto out;
}
* 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);
+ ret = btrfs_list_get_path_rootid(rctx->mnt_fd, &subvol_id);
+ if (ret)
goto out;
- }
root_subvol_path[0] = 0;
- ret = btrfs_subvolid_resolve(r->mnt_fd, root_subvol_path,
+ ret = btrfs_subvolid_resolve(rctx->mnt_fd, root_subvol_path,
PATH_MAX, subvol_id);
if (ret) {
error("cannot resolve our subvol path");
* actually set full_root_path.
*/
if (*root_subvol_path)
- r->full_root_path = root_subvol_path;
+ rctx->full_root_path = root_subvol_path;
- if (r->dest_dir_chroot) {
+ if (rctx->dest_dir_chroot) {
if (chroot(dest_dir_full_path)) {
ret = -errno;
error("failed to chroot to %s: %s",
goto out;
}
fprintf(stderr, "Chroot to %s\n", dest_dir_full_path);
- r->root_path = strdup("/");
- r->dest_dir_path = r->root_path;
+ rctx->root_path = strdup("/");
+ rctx->dest_dir_path = rctx->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++;
+ rctx->dest_dir_path = dest_dir_full_path + strlen(rctx->root_path);
+ while (rctx->dest_dir_path[0] == '/')
+ rctx->dest_dir_path++;
}
- ret = subvol_uuid_search_init(r->mnt_fd, &r->sus);
+ ret = subvol_uuid_search_init(rctx->mnt_fd, &rctx->sus);
if (ret < 0)
goto out;
while (!end) {
- if (r->cached_capabilities_len) {
+ if (rctx->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;
+ memset(rctx->cached_capabilities, 0,
+ sizeof(rctx->cached_capabilities));
+ rctx->cached_capabilities_len = 0;
}
- ret = btrfs_read_and_process_send_stream(r_fd, &send_ops, r,
- r->honor_end_cmd,
+ ret = btrfs_read_and_process_send_stream(r_fd, &send_ops,
+ rctx,
+ rctx->honor_end_cmd,
max_errors);
- if (ret < 0)
- goto out;
- if (ret)
+ if (ret < 0) {
+ if (ret != -ENODATA)
+ goto out;
+
+ /* Empty stream is invalid */
+ if (iterations == 0) {
+ error("empty stream is not considered valid");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = 1;
+ }
+ if (ret > 0)
end = 1;
- close_inode_for_write(r);
- ret = finish_subvol(r);
+ close_inode_for_write(rctx);
+ ret = finish_subvol(rctx);
if (ret < 0)
goto out;
+
+ iterations++;
}
ret = 0;
out:
- if (r->write_fd != -1) {
- close(r->write_fd);
- r->write_fd = -1;
+ if (rctx->write_fd != -1) {
+ close(rctx->write_fd);
+ rctx->write_fd = -1;
}
- if (r->root_path != realmnt)
- free(r->root_path);
- r->root_path = NULL;
- r->dest_dir_path = NULL;
+ if (rctx->root_path != realmnt)
+ free(rctx->root_path);
+ rctx->root_path = NULL;
+ rctx->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;
+ subvol_uuid_search_finit(&rctx->sus);
+ if (rctx->mnt_fd != -1) {
+ close(rctx->mnt_fd);
+ rctx->mnt_fd = -1;
}
- if (r->dest_dir_fd != -1) {
- close(r->dest_dir_fd);
- r->dest_dir_fd = -1;
+ if (rctx->dest_dir_fd != -1) {
+ close(rctx->dest_dir_fd);
+ rctx->dest_dir_fd = -1;
}
return ret;
char *tomnt = NULL;
char fromfile[PATH_MAX];
char realmnt[PATH_MAX];
- struct btrfs_receive r;
+ struct btrfs_receive rctx;
int receive_fd = fileno(stdin);
u64 max_errors = 1;
+ int dump = 0;
int ret = 0;
- memset(&r, 0, sizeof(r));
- r.mnt_fd = -1;
- r.write_fd = -1;
- r.dest_dir_fd = -1;
- r.dest_dir_chroot = 0;
+ memset(&rctx, 0, sizeof(rctx));
+ rctx.mnt_fd = -1;
+ rctx.write_fd = -1;
+ rctx.dest_dir_fd = -1;
+ rctx.dest_dir_chroot = 0;
realmnt[0] = 0;
fromfile[0] = 0;
while (1) {
int c;
+ enum { GETOPT_VAL_DUMP = 257 };
static const struct option long_opts[] = {
{ "max-errors", required_argument, NULL, 'E' },
{ "chroot", no_argument, NULL, 'C' },
+ { "dump", no_argument, NULL, GETOPT_VAL_DUMP },
{ NULL, 0, NULL, 0 }
};
- c = getopt_long(argc, argv, "Cevf:m:", long_opts, NULL);
+ c = getopt_long(argc, argv, "Cevf:m:E:", long_opts, NULL);
if (c < 0)
break;
}
break;
case 'e':
- r.honor_end_cmd = 1;
+ rctx.honor_end_cmd = 1;
break;
case 'C':
- r.dest_dir_chroot = 1;
+ rctx.dest_dir_chroot = 1;
break;
case 'E':
max_errors = arg_strtou64(optarg);
goto out;
}
break;
+ case GETOPT_VAL_DUMP:
+ dump = 1;
+ break;
case '?':
default:
error("receive args invalid");
}
}
- if (check_argc_exact(argc - optind, 1))
+ if (dump && check_argc_exact(argc - optind, 0))
+ usage(cmd_receive_usage);
+ if (!dump && check_argc_exact(argc - optind, 1))
usage(cmd_receive_usage);
tomnt = argv[optind];
if (fromfile[0]) {
receive_fd = open(fromfile, O_RDONLY | O_NOATIME);
if (receive_fd < 0) {
- error("cannot open %s: %s", fromfile, strerror(errno));
+ error("cannot open %s: %m", fromfile);
goto out;
}
}
- ret = do_receive(&r, tomnt, realmnt, receive_fd, max_errors);
+ if (dump) {
+ struct btrfs_dump_send_args dump_args;
+
+ dump_args.root_path[0] = '.';
+ dump_args.root_path[1] = '\0';
+ dump_args.full_subvol_path[0] = '.';
+ dump_args.full_subvol_path[1] = '\0';
+ ret = btrfs_read_and_process_send_stream(receive_fd,
+ &btrfs_print_send_ops, &dump_args, 0, 0);
+ if (ret < 0)
+ error("failed to dump the send stream: %s",
+ strerror(-ret));
+ } else {
+ ret = do_receive(&rctx, tomnt, realmnt, receive_fd, max_errors);
+ }
+
if (receive_fd != fileno(stdin))
close(receive_fd);
-
out:
return !!ret;
}
const char * const cmd_receive_usage[] = {
- "btrfs receive [-ve] [-f <infile>] [--max-errors <N>] <mount>",
- "Receive subvolumes from stdin.",
+ "btrfs receive [options] <mount>\n"
+ "btrfs receive --dump [options]",
+ "Receive subvolumes from a stream",
"Receives one or more subvolumes that were previously",
"sent with btrfs send. The received subvolumes are stored",
- "into <mount>.",
- "btrfs receive will fail in case a receiving subvolume",
+ "into MOUNT.",
+ "The receive will fail in case the receiving subvolume",
"already exists. It will also fail in case a previously",
- "received subvolume was changed after it was received.",
+ "received subvolume has been changed after it was received.",
"After receiving a subvolume, it is immediately set to",
- "read only.\n",
- "-v Enable verbose debug output. Each",
- " occurrence of this option increases the",
- " verbose level more.",
- "-f <infile> By default, btrfs receive uses stdin",
- " to receive the subvolumes. Use this",
- " option to specify a file to use instead.",
- "-e Terminate after receiving an <end cmd>",
- " in the data stream. Without this option,",
- " the receiver terminates only if an error",
- " is recognized or on EOF.",
+ "read-only.",
+ "",
+ "-v increase verbosity about performed actions",
+ "-f FILE read the stream from FILE instead of stdin",
+ "-e terminate after receiving an <end cmd> marker in the stream.",
+ " Without this option the receiver side terminates only in case",
+ " of an error on end of file.",
"-C|--chroot confine the process to <mount> using chroot",
- "--max-errors <N> Terminate as soon as N errors happened while",
- " processing commands from the send stream.",
+ "-E|--max-errors NERR",
+ " terminate as soon as NERR errors occur while",
+ " stream processing commands from the stream.",
" Default value is 1. A value of 0 means no limit.",
- "-m <mountpoint> The root mount point of the destination fs.",
- " If you do not have /proc use this to tell us where ",
+ "-m ROOTMOUNT the root mount point of the destination filesystem.",
+ " If /proc is not accessible, use this to tell us where",
" this file system is mounted.",
+ "--dump dump stream metadata, one line per operation,",
+ " does not require the MOUNT parameter",
NULL
};
projects / platform / upstream / btrfs-progs.git / blobdiff