/*

* Copyright (C) 2012 Alexander Block. All rights reserved.

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public

* License v2 as published by the Free Software Foundation.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* General Public License for more details.

*

* You should have received a copy of the GNU General Public

* License along with this program; if not, write to the

* Free Software Foundation, Inc., 59 Temple Place - Suite 330,

* Boston, MA 021110-1307, USA.

*/

#define _GNU_SOURCE

#define _POSIX_C_SOURCE 200809

#define _XOPEN_SOURCE 700

#define _BSD_SOURCE

#include "kerncompat.h"

#include <unistd.h>

#include <stdint.h>

#include <dirent.h>

#include <fcntl.h>

#include <pthread.h>

#include <math.h>

#include <ftw.h>

#include <wait.h>

#include <assert.h>

#include <getopt.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <sys/types.h>

#include <sys/xattr.h>

#include <uuid/uuid.h>

#include "ctree.h"

#include "ioctl.h"

#include "commands.h"

#include "utils.h"

#include "list.h"

#include "btrfs-list.h"

#include "send.h"

#include "send-stream.h"

#include "send-utils.h"

static int g_verbose = 0;

struct btrfs_receive

};

static int finish_subvol(struct btrfs_receive *r)

{

int ret;

int subvol_fd = -1;

struct btrfs_ioctl_received_subvol_args rs_args;

char uuid_str[BTRFS_UUID_UNPARSED_SIZE];

u64 flags;

if (r->cur_subvol == NULL)

return 0;

subvol_fd = openat(r->mnt_fd, r->cur_subvol->path,

O_RDONLY | O_NOATIME);

if (subvol_fd < 0) {

ret = -errno;

fprintf(stderr, "ERROR: open %s failed. %s\n",

r->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;

if (g_verbose >= 1) {

uuid_unparse((u8*)rs_args.uuid, uuid_str);

fprintf(stderr, "BTRFS_IOC_SET_RECEIVED_SUBVOL uuid=%s, "

"stransid=%llu\n", uuid_str, rs_args.stransid);

}

ret = ioctl(subvol_fd, BTRFS_IOC_SET_RECEIVED_SUBVOL, &rs_args);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: BTRFS_IOC_SET_RECEIVED_SUBVOL failed. %s\n",

strerror(-ret));

goto out;

}

r->cur_subvol->rtransid = rs_args.rtransid;

ret = ioctl(subvol_fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: BTRFS_IOC_SUBVOL_GETFLAGS failed. %s\n",

strerror(-ret));

goto out;

}

flags |= BTRFS_SUBVOL_RDONLY;

ret = ioctl(subvol_fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: failed to make subvolume read only. "

"%s\n", strerror(-ret));

goto out;

}

ret = 0;

out:

if (r->cur_subvol) {

free(r->cur_subvol->path);

free(r->cur_subvol);

r->cur_subvol = NULL;

}

if (subvol_fd != -1)

close(subvol_fd);

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;

}

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_mkfile(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "mkfile %s\n", path);

ret = creat(full_path, 0600);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: mkfile %s failed. %s\n", path,

strerror(-ret));

goto out;

}

close(ret);

ret = 0;

out:

free(full_path);

return ret;

}

static int process_mkdir(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "mkdir %s\n", path);

ret = mkdir(full_path, 0700);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: mkdir %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int process_mknod(const char *path, u64 mode, u64 dev, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "mknod %s mode=%llu, dev=%llu\n",

path, mode, dev);

ret = mknod(full_path, mode & S_IFMT, dev);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: mknod %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int process_mkfifo(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "mkfifo %s\n", path);

ret = mkfifo(full_path, 0600);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: mkfifo %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int process_mksock(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "mksock %s\n", path);

ret = mknod(full_path, 0600 | S_IFSOCK, 0);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: mknod %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int process_symlink(const char *path, const char *lnk, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "symlink %s -> %s\n", path, lnk);

ret = symlink(lnk, full_path);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: symlink %s -> %s failed. %s\n", path,

lnk, strerror(-ret));

}

free(full_path);

return ret;

}

static int process_rename(const char *from, const char *to, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_from = path_cat(r->full_subvol_path, from);

char *full_to = path_cat(r->full_subvol_path, to);

if (g_verbose >= 2)

fprintf(stderr, "rename %s -> %s\n", from, to);

ret = rename(full_from, full_to);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: rename %s -> %s failed. %s\n", from,

to, strerror(-ret));

}

free(full_from);

free(full_to);

return ret;

}

static int process_link(const char *path, const char *lnk, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

char *full_link_path = path_cat(r->full_subvol_path, lnk);

if (g_verbose >= 2)

fprintf(stderr, "link %s -> %s\n", path, lnk);

ret = link(full_link_path, full_path);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: link %s -> %s failed. %s\n", path,

lnk, strerror(-ret));

}

free(full_path);

free(full_link_path);

return ret;

}

static int process_unlink(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "unlink %s\n", path);

ret = unlink(full_path);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: unlink %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int process_rmdir(const char *path, void *user)

{

int ret;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "rmdir %s\n", path);

ret = rmdir(full_path);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: rmdir %s failed. %s\n", path,

strerror(-ret));

}

free(full_path);

return ret;

}

static int open_inode_for_write(struct btrfs_receive *r, const char *path)

{

int ret = 0;

if (r->write_fd != -1) {

if (strcmp(r->write_path, path) == 0)

goto out;

close(r->write_fd);

r->write_fd = -1;

}

r->write_fd = open(path, O_RDWR);

if (r->write_fd < 0) {

ret = -errno;

fprintf(stderr, "ERROR: open %s failed. %s\n", path,

strerror(-ret));

goto out;

}

free(r->write_path);

r->write_path = strdup(path);

out:

return ret;

}

static void close_inode_for_write(struct btrfs_receive *r)

{

if(r->write_fd == -1)

return;

close(r->write_fd);

r->write_fd = -1;

r->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;

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_cat(r->full_subvol_path, path);

char *subvol_path = NULL;

char *full_clone_path = NULL;

int clone_fd = -1;

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;

fprintf(stderr, "ERROR: did not find source subvol.\n");

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);

}

full_clone_path = path_cat3(r->root_path, subvol_path, clone_path);

clone_fd = open(full_clone_path, O_RDONLY | O_NOATIME);

if (clone_fd < 0) {

ret = -errno;

fprintf(stderr, "ERROR: failed to open %s. %s\n",

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) {

ret = -errno;

fprintf(stderr, "ERROR: failed to clone extents to %s\n%s\n",

path, strerror(-ret));

goto out;

}

out:

if (si) {

free(si->path);

free(si);

}

free(full_path);

free(full_clone_path);

free(subvol_path);

if (clone_fd != -1)

close(clone_fd);

return ret;

}

static int process_set_xattr(const char *path, const char *name,

const void *data, int len, void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2) {

fprintf(stderr, "set_xattr %s - name=%s data_len=%d "

"data=%.*s\n", path, name, len,

len, (char*)data);

}

ret = lsetxattr(full_path, name, data, len, 0);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: lsetxattr %s %s=%.*s failed. %s\n",

path, name, len, (char*)data, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static int process_remove_xattr(const char *path, const char *name, void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2) {

fprintf(stderr, "remove_xattr %s - name=%s\n",

path, name);

}

ret = lremovexattr(full_path, name);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: lremovexattr %s %s failed. %s\n",

path, name, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static int process_truncate(const char *path, u64 size, void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "truncate %s size=%llu\n", path, size);

ret = truncate(full_path, size);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: truncate %s failed. %s\n",

path, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static int process_chmod(const char *path, u64 mode, void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "chmod %s - mode=0%o\n", path, (int)mode);

ret = chmod(full_path, mode);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: chmod %s failed. %s\n",

path, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static int process_chown(const char *path, u64 uid, u64 gid, void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

if (g_verbose >= 2)

fprintf(stderr, "chown %s - uid=%llu, gid=%llu\n", path,

uid, gid);

ret = lchown(full_path, uid, gid);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: chown %s failed. %s\n",

path, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static int process_utimes(const char *path, struct timespec *at,

struct timespec *mt, struct timespec *ct,

void *user)

{

int ret = 0;

struct btrfs_receive *r = user;

char *full_path = path_cat(r->full_subvol_path, path);

struct timespec tv[2];

if (g_verbose >= 2)

fprintf(stderr, "utimes %s\n", path);

tv[0] = *at;

tv[1] = *mt;

ret = utimensat(AT_FDCWD, full_path, tv, AT_SYMLINK_NOFOLLOW);

if (ret < 0) {

ret = -errno;

fprintf(stderr, "ERROR: utimes %s failed. %s\n",

path, strerror(-ret));

goto out;

}

out:

free(full_path);

return ret;

}

static struct btrfs_send_ops send_ops = {

.subvol = process_subvol,

.snapshot = process_snapshot,

.mkfile = process_mkfile,

.mkdir = process_mkdir,

.mknod = process_mknod,

.mkfifo = process_mkfifo,

.mksock = process_mksock,

.symlink = process_symlink,

.rename = process_rename,

.link = process_link,

.unlink = process_unlink,

.rmdir = process_rmdir,

.write = process_write,

.clone = process_clone,

.set_xattr = process_set_xattr,

.remove_xattr = process_remove_xattr,

.truncate = process_truncate,

.chmod = process_chmod,

.chown = process_chown,

.utimes = process_utimes,

};

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 const struct option long_opts[] = {

{ "max-errors", 1, NULL, 'E' },

{ NULL, 0, NULL, 0 }

};

int cmd_receive(int argc, char **argv)

{

int c;

char *tomnt = NULL;

char *fromfile = NULL;

struct btrfs_receive r;

int receive_fd = fileno(stdin);

u64 max_errors = 1;

int ret;

memset(&r, 0, sizeof(r));

r.mnt_fd = -1;

r.write_fd = -1;

r.dest_dir_fd = -1;

while ((c = getopt_long(argc, argv, "evf:", long_opts, NULL)) != -1) {

switch (c) {

case 'v':

g_verbose++;

break;

case 'f':

fromfile = optarg;

break;

case 'e':

r.honor_end_cmd = 1;

break;

case 'E':

max_errors = arg_strtou64(optarg);

break;

case '?':

default:

fprintf(stderr, "ERROR: receive args invalid.\n");

return 1;

}

}

if (check_argc_exact(argc - optind, 1))

usage(cmd_receive_usage);

tomnt = argv[optind];

if (fromfile) {

receive_fd = open(fromfile, O_RDONLY | O_NOATIME);

if (receive_fd < 0) {

fprintf(stderr, "ERROR: failed to open %s\n", fromfile);

return 1;

}

}

ret = do_receive(&r, tomnt, receive_fd, max_errors);

return !!ret;

}

const char * const cmd_receive_usage[] = {

"btrfs receive [-ve] [-f <infile>] [--max-errors <N>] <mount>",

"Receive subvolumes from stdin.",

"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",

"already exists. It will also fail in case a previously",

"received subvolume was 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.",