| /* |
| * 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 _DEFAULT_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 |
| { |
| int mnt_fd; |
| int dest_dir_fd; |
| |
| int write_fd; |
| char *write_path; |
| |
| char *root_path; |
| char *dest_dir_path; /* relative to root_path */ |
| char *full_subvol_path; |
| |
| struct subvol_info *cur_subvol; |
| |
| struct subvol_uuid_search sus; |
| |
| int honor_end_cmd; |
| }; |
| |
| 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.", |
| "-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.", |
| "--max-errors <N> Terminate as soon as N errors happened while", |
| " processing commands from the send stream.", |
| " Default value is 1. A value of 0 means no limit.", |
| NULL |
| }; |