cmds-quota.c

   1 /*
   2  * Copyright (C) 2012 STRATO.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <sys/ioctl.h>
  20 #include <unistd.h>
  21
  22 #include "ctree.h"
  23 #include "ioctl.h"
  24
  25 #include "commands.h"
  26 #include "utils.h"
  27 #include "help.h"
  28
  29 static const char * const quota_cmd_group_usage[] = {
  30         "btrfs quota <command> [options] <path>",
  31         NULL
  32 };
  33
  34 static int quota_ctl(int cmd, int argc, char **argv)
  35 {
  36         int ret = 0;
  37         int fd;
  38         char *path = argv[1];
  39         struct btrfs_ioctl_quota_ctl_args args;
  40         DIR *dirstream = NULL;
  41
  42         if (check_argc_exact(argc, 2))
  43                 return -1;
  44
  45         memset(&args, 0, sizeof(args));
  46         args.cmd = cmd;
  47
  48         fd = btrfs_open_dir(path, &dirstream, 1);
  49         if (fd < 0)
  50                 return 1;
  51
  52         ret = ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args);
  53         close_file_or_dir(fd, dirstream);
  54         if (ret < 0) {
  55                 error("quota command failed: %m");
  56                 return 1;
  57         }
  58         return 0;
  59 }
  60
  61 static const char * const cmd_quota_enable_usage[] = {
  62         "btrfs quota enable <path>",
  63         "Enable subvolume quota support for a filesystem.",
  64         "Any data already present on the filesystem will not count towards",
  65         "the space usage numbers. It is recommended to enable quota for a",
  66         "filesystem before writing any data to it.",
  67         NULL
  68 };
  69
  70 static int cmd_quota_enable(int argc, char **argv)
  71 {
  72         int ret;
  73
  74         clean_args_no_options(argc, argv, cmd_quota_enable_usage);
  75
  76         ret = quota_ctl(BTRFS_QUOTA_CTL_ENABLE, argc, argv);
  77
  78         if (ret < 0)
  79                 usage(cmd_quota_enable_usage);
  80         return ret;
  81 }
  82
  83 static const char * const cmd_quota_disable_usage[] = {
  84         "btrfs quota disable <path>",
  85         "Disable subvolume quota support for a filesystem.",
  86         NULL
  87 };
  88
  89 static int cmd_quota_disable(int argc, char **argv)
  90 {
  91         int ret;
  92
  93         clean_args_no_options(argc, argv, cmd_quota_disable_usage);
  94
  95         ret = quota_ctl(BTRFS_QUOTA_CTL_DISABLE, argc, argv);
  96
  97         if (ret < 0)
  98                 usage(cmd_quota_disable_usage);
  99         return ret;
 100 }
 101
 102 static const char * const cmd_quota_rescan_usage[] = {
 103         "btrfs quota rescan [-sw] <path>",
 104         "Trash all qgroup numbers and scan the metadata again with the current config.",
 105         "",
 106         "-s   show status of a running rescan operation",
 107         "-w   wait for rescan operation to finish (can be already in progress)",
 108         NULL
 109 };
 110
 111 static int cmd_quota_rescan(int argc, char **argv)
 112 {
 113         int ret = 0;
 114         int fd;
 115         int e;
 116         char *path = NULL;
 117         struct btrfs_ioctl_quota_rescan_args args;
 118         unsigned long ioctlnum = BTRFS_IOC_QUOTA_RESCAN;
 119         DIR *dirstream = NULL;
 120         int wait_for_completion = 0;
 121
 122         optind = 0;
 123         while (1) {
 124                 int c = getopt(argc, argv, "sw");
 125                 if (c < 0)
 126                         break;
 127                 switch (c) {
 128                 case 's':
 129                         ioctlnum = BTRFS_IOC_QUOTA_RESCAN_STATUS;
 130                         break;
 131                 case 'w':
 132                         wait_for_completion = 1;
 133                         break;
 134                 default:
 135                         usage(cmd_quota_rescan_usage);
 136                 }
 137         }
 138
 139         if (ioctlnum != BTRFS_IOC_QUOTA_RESCAN && wait_for_completion) {
 140                 error("switch -w cannot be used with -s");
 141                 return 1;
 142         }
 143
 144         if (check_argc_exact(argc - optind, 1))
 145                 usage(cmd_quota_rescan_usage);
 146
 147         memset(&args, 0, sizeof(args));
 148
 149         path = argv[optind];
 150         fd = btrfs_open_dir(path, &dirstream, 1);
 151         if (fd < 0)
 152                 return 1;
 153
 154         ret = ioctl(fd, ioctlnum, &args);
 155         e = errno;
 156
 157         if (ioctlnum == BTRFS_IOC_QUOTA_RESCAN_STATUS) {
 158                 close_file_or_dir(fd, dirstream);
 159                 if (ret < 0) {
 160                         error("could not obtain quota rescan status: %m");
 161                         return 1;
 162                 }
 163                 if (!args.flags)
 164                         printf("no rescan operation in progress\n");
 165                 else
 166                         printf("rescan operation running (current key %lld)\n",
 167                                 args.progress);
 168                 return 0;
 169         }
 170
 171         if (ret == 0) {
 172                 printf("quota rescan started\n");
 173                 fflush(stdout);
 174         } else if (ret < 0 && (!wait_for_completion || e != EINPROGRESS)) {
 175                 error("quota rescan failed: %m");
 176                 close_file_or_dir(fd, dirstream);
 177                 return 1;
 178         }
 179
 180         if (wait_for_completion) {
 181                 ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT, &args);
 182                 e = errno;
 183                 if (ret < 0) {
 184                         error("quota rescan wait failed: %m");
 185                         close_file_or_dir(fd, dirstream);
 186                         return 1;
 187                 }
 188         }
 189
 190         close_file_or_dir(fd, dirstream);
 191         return 0;
 192 }
 193
 194 static const char quota_cmd_group_info[] =
 195 "manage filesystem quota settings";
 196
 197 const struct cmd_group quota_cmd_group = {
 198         quota_cmd_group_usage, quota_cmd_group_info, {
 199                 { "enable", cmd_quota_enable, cmd_quota_enable_usage, NULL, 0 },
 200                 { "disable", cmd_quota_disable, cmd_quota_disable_usage,
 201                    NULL, 0 },
 202                 { "rescan", cmd_quota_rescan, cmd_quota_rescan_usage, NULL, 0 },
 203                 NULL_CMD_STRUCT
 204         }
 205 };
 206
 207 int cmd_quota(int argc, char **argv)
 208 {
 209         return handle_command_group(&quota_cmd_group, argc, argv);
 210 }