static int process_write(const char *path, const void *data, u64 offset,
u64 len, void *user)
{
int ret = 0;
struct btrfs_receive *r = user;
char full_path[PATH_MAX];
u64 pos = 0;
int w;
ret = path_cat_out(full_path, r->full_subvol_path, path);
if (ret < 0) {
error("write: path invalid: %s", path);
goto out;
}
ret = open_inode_for_write(r, full_path);
if (ret < 0)
goto out;
while (pos < len) {
w = pwrite(r->write_fd, (char*)data + pos, len - pos,
offset + pos);
if (w < 0) {
ret = -errno;
error("writing to %s failed: %s\n",
path, strerror(-ret));
goto out;
}
pos += w;
}
out:
return ret;
}
static int process_write(const char *path, const void *data, u64 offset,
u64 len, void *user)
{
int ret = 0;
struct btrfs_receive *r = user;
char *full_path = path_cat(r->full_subvol_path, path);
u64 pos = 0;
int w;
ret = open_inode_for_write(r, full_path);
if (ret < 0)
goto out;
while (pos < len) {
w = pwrite(r->write_fd, (char*)data + pos, len - pos,
offset + pos);
if (w < 0) {
ret = -errno;
fprintf(stderr, "ERROR: writing to %s failed. %s\n",
path, strerror(-ret));
goto out;
}
pos += w;
}
out:
free(full_path);
return ret;
}
static int process_clone(const char *path, u64 offset, u64 len,
const u8 *clone_uuid, u64 clone_ctransid,
const char *clone_path, u64 clone_offset,
void *user)
{
int ret;
struct btrfs_receive *r = user;
struct btrfs_ioctl_clone_range_args clone_args;
struct subvol_info *si = NULL;
char full_path[PATH_MAX];
char *subvol_path = NULL;
char full_clone_path[PATH_MAX];
int clone_fd = -1;
ret = path_cat_out(full_path, r->full_subvol_path, path);
if (ret < 0) {
error("clone: source path invalid: %s", path);
goto out;
}
ret = open_inode_for_write(r, 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,
BTRFS_UUID_SIZE) == 0) {
/* TODO check generation of extent */
subvol_path = strdup(r->cur_subvol_path);
} else {
ret = -ENOENT;
error("clone: did not find source subvol");
goto out;
}
} else {
/*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);
}
}*/
subvol_path = strdup(si->path);
}
ret = path_cat_out(full_clone_path, subvol_path, clone_path);
if (ret < 0) {
error("clone: target path invalid: %s", clone_path);
goto out;
}
clone_fd = openat(r->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));
goto out;
}
clone_args.src_fd = clone_fd;
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);
if (ret < 0) {
ret = -errno;
error("failed to clone extents to %s\n%s\n",
path, strerror(-ret));
goto out;
}
out:
if (si) {
free(si->path);
free(si);
}
free(subvol_path);
if (clone_fd != -1)
close(clone_fd);
return ret;
}
