forked from Mirrors/btrfs-progs
445 lines
8.8 KiB
C
445 lines
8.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <libgen.h>
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#include <limits.h>
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#include "kerncompat.h"
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#include "ioctl.h"
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#include "btrfs_cmds.h"
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/* btrfs-list.c */
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int list_subvols(int fd, int print_parent, int get_default);
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int find_updated_files(int fd, u64 root_id, u64 oldest_gen);
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/*
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* test if path is a directory
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* this function return
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* 0-> path exists but it is not a directory
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* 1-> path exists and it is a directory
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* -1 -> path is unaccessible
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*/
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static int test_isdir(char *path)
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{
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struct stat st;
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int res;
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res = stat(path, &st);
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if(res < 0 )
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return -1;
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return S_ISDIR(st.st_mode);
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}
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int do_create_subvol(int argc, char **argv)
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{
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int res, fddst, len, e;
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char *newname;
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char *dstdir;
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struct btrfs_ioctl_vol_args args;
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char *dst = argv[1];
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res = test_isdir(dst);
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if(res >= 0 ){
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fprintf(stderr, "ERROR: '%s' exists\n", dst);
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return 12;
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}
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newname = strdup(dst);
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newname = basename(newname);
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dstdir = strdup(dst);
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dstdir = dirname(dstdir);
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if( !strcmp(newname,".") || !strcmp(newname,"..") ||
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strchr(newname, '/') ){
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fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
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newname);
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return 14;
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}
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len = strlen(newname);
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if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
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fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
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newname);
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return 14;
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}
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fddst = open_file_or_dir(dstdir);
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if (fddst < 0) {
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fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
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return 12;
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}
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printf("Create subvolume '%s/%s'\n", dstdir, newname);
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strncpy(args.name, newname, BTRFS_PATH_NAME_MAX);
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res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
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e = errno;
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close(fddst);
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if(res < 0 ){
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fprintf( stderr, "ERROR: cannot create subvolume - %s\n",
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strerror(e));
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return 11;
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}
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return 0;
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}
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/*
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* test if path is a subvolume:
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* this function return
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* 0-> path exists but it is not a subvolume
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* 1-> path exists and it is a subvolume
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* -1 -> path is unaccessible
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*/
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static int test_issubvolume(char *path)
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{
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struct stat st;
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int res;
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res = stat(path, &st);
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if(res < 0 )
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return -1;
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return (st.st_ino == 256) && S_ISDIR(st.st_mode);
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}
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int do_delete_subvolume(int argc, char **argv)
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{
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int res, fd, len, e;
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struct btrfs_ioctl_vol_args args;
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char *dname, *vname, *cpath;
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char *path = argv[1];
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res = test_issubvolume(path);
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if(res<0){
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fprintf(stderr, "ERROR: error accessing '%s'\n", path);
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return 12;
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}
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if(!res){
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fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
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return 13;
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}
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cpath = realpath(path, 0);
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dname = strdup(cpath);
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dname = dirname(dname);
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vname = strdup(cpath);
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vname = basename(vname);
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free(cpath);
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if( !strcmp(vname,".") || !strcmp(vname,"..") ||
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strchr(vname, '/') ){
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fprintf(stderr, "ERROR: incorrect subvolume name ('%s')\n",
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vname);
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return 14;
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}
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len = strlen(vname);
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if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
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fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
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vname);
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return 14;
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}
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fd = open_file_or_dir(dname);
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if (fd < 0) {
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close(fd);
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fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
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return 12;
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}
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printf("Delete subvolume '%s/%s'\n", dname, vname);
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strncpy(args.name, vname, BTRFS_PATH_NAME_MAX);
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res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
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e = errno;
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close(fd);
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if(res < 0 ){
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fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
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dname, vname, strerror(e));
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return 11;
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}
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return 0;
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}
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int do_subvol_list(int argc, char **argv)
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{
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int fd;
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int ret;
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int print_parent = 0;
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char *subvol;
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int optind = 1;
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while(1) {
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int c = getopt(argc, argv, "p");
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if (c < 0) break;
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switch(c) {
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case 'p':
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print_parent = 1;
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optind++;
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break;
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}
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}
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if (argc - optind != 1) {
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fprintf(stderr, "ERROR: invalid arguments for subvolume list\n");
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return 1;
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}
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subvol = argv[optind];
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ret = test_issubvolume(subvol);
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if (ret < 0) {
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fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
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return 12;
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}
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if (!ret) {
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fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
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return 13;
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}
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fd = open_file_or_dir(subvol);
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if (fd < 0) {
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fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
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return 12;
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}
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ret = list_subvols(fd, print_parent, 0);
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if (ret)
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return 19;
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return 0;
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}
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int do_clone(int argc, char **argv)
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{
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char *subvol, *dst;
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int res, fd, fddst, len, e, optind = 0, readonly = 0;
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char *newname;
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char *dstdir;
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struct btrfs_ioctl_vol_args_v2 args;
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memset(&args, 0, sizeof(args));
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while (1) {
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int c = getopt(argc, argv, "r");
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if (c < 0)
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break;
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switch (c) {
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case 'r':
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optind++;
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readonly = 1;
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break;
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default:
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fprintf(stderr,
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"Invalid arguments for subvolume snapshot\n");
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free(argv);
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return 1;
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}
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}
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if (argc - optind != 3) {
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fprintf(stderr, "Invalid arguments for subvolume snapshot\n");
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free(argv);
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return 1;
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}
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subvol = argv[optind+1];
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dst = argv[optind+2];
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res = test_issubvolume(subvol);
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if(res<0){
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fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
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return 12;
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}
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if(!res){
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fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
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return 13;
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}
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res = test_isdir(dst);
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if(res == 0 ){
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fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", dst);
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return 12;
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}
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if(res>0){
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newname = strdup(subvol);
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newname = basename(newname);
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dstdir = dst;
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}else{
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newname = strdup(dst);
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newname = basename(newname);
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dstdir = strdup(dst);
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dstdir = dirname(dstdir);
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}
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if( !strcmp(newname,".") || !strcmp(newname,"..") ||
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strchr(newname, '/') ){
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fprintf(stderr, "ERROR: incorrect snapshot name ('%s')\n",
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newname);
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return 14;
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}
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len = strlen(newname);
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if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
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fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
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newname);
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return 14;
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}
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fddst = open_file_or_dir(dstdir);
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if (fddst < 0) {
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fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
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return 12;
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}
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fd = open_file_or_dir(subvol);
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if (fd < 0) {
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close(fddst);
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fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
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return 12;
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}
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if (readonly) {
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args.flags |= BTRFS_SUBVOL_RDONLY;
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printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
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subvol, dstdir, newname);
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} else {
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printf("Create a snapshot of '%s' in '%s/%s'\n",
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subvol, dstdir, newname);
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}
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args.fd = fd;
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strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
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res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args);
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e = errno;
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close(fd);
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close(fddst);
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if(res < 0 ){
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fprintf( stderr, "ERROR: cannot snapshot '%s' - %s\n",
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subvol, strerror(e));
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return 11;
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}
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return 0;
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}
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int do_get_default_subvol(int nargs, char **argv)
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{
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int fd;
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int ret;
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char *subvol;
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subvol = argv[1];
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ret = test_issubvolume(subvol);
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if (ret < 0) {
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fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
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return 12;
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}
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if (!ret) {
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fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
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return 13;
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}
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fd = open_file_or_dir(subvol);
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if (fd < 0) {
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fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
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return 12;
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}
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ret = list_subvols(fd, 0, 1);
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if (ret)
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return 19;
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return 0;
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}
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int do_set_default_subvol(int nargs, char **argv)
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{
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int ret=0, fd, e;
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u64 objectid;
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char *path = argv[2];
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char *subvolid = argv[1];
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fd = open_file_or_dir(path);
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if (fd < 0) {
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fprintf(stderr, "ERROR: can't access to '%s'\n", path);
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return 12;
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}
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objectid = (unsigned long long)strtoll(subvolid, NULL, 0);
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if (errno == ERANGE) {
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fprintf(stderr, "ERROR: invalid tree id (%s)\n",subvolid);
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return 30;
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}
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ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
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e = errno;
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close(fd);
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if( ret < 0 ){
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fprintf(stderr, "ERROR: unable to set a new default subvolume - %s\n",
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strerror(e));
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return 30;
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}
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return 0;
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}
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int do_find_newer(int argc, char **argv)
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{
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int fd;
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int ret;
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char *subvol;
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u64 last_gen;
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subvol = argv[1];
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last_gen = atoll(argv[2]);
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ret = test_issubvolume(subvol);
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if (ret < 0) {
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fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
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return 12;
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}
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if (!ret) {
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fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
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return 13;
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}
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fd = open_file_or_dir(subvol);
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if (fd < 0) {
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fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
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return 12;
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}
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ret = find_updated_files(fd, 0, last_gen);
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if (ret)
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return 19;
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return 0;
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}
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