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
  28 static const char * const quota_cmd_group_usage[] = {
  29         "btrfs quota <command> [options] <path>",
  30         NULL
  31 };
  32
  33 int quota_ctl(int cmd, int argc, char **argv)
  34 {
  35         int ret = 0;
  36         int fd;
  37         int e;
  38         char *path = argv[1];
  39         struct btrfs_ioctl_quota_ctl_args args;
  40
  41         if (check_argc_exact(argc, 2))
  42                 return -1;
  43
  44         memset(&args, 0, sizeof(args));
  45         args.cmd = cmd;
  46
  47         fd = open_file_or_dir(path);
  48         if (fd < 0) {
  49                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
  50                 return 12;
  51         }
  52
  53         ret = ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args);
  54         e = errno;
  55         close(fd);
  56         if (ret < 0) {
  57                 fprintf(stderr, "ERROR: quota command failed: %s\n",
  58                         strerror(e));
  59                 return 30;
  60         }
  61         return 0;
  62 }
  63
  64 static const char * const cmd_quota_enable_usage[] = {
  65         "btrfs quota enable <path>",
  66         "Enable subvolume quota support for a filesystem.",
  67         NULL
  68 };
  69
  70 static int cmd_quota_enable(int argc, char **argv)
  71 {
  72         int ret = quota_ctl(BTRFS_QUOTA_CTL_ENABLE, argc, argv);
  73         if (ret < 0)
  74                 usage(cmd_quota_enable_usage);
  75         return ret;
  76 }
  77
  78 static const char * const cmd_quota_disable_usage[] = {
  79         "btrfs quota disable <path>",
  80         "Disable subvolume quota support for a filesystem.",
  81         NULL
  82 };
  83
  84 static int cmd_quota_disable(int argc, char **argv)
  85 {
  86         int ret = quota_ctl(BTRFS_QUOTA_CTL_DISABLE, argc, argv);
  87         if (ret < 0)
  88                 usage(cmd_quota_disable_usage);
  89         return ret;
  90 }
  91
  92 static const char * const cmd_quota_rescan_usage[] = {
  93         "btrfs quota rescan <path>",
  94         "Rescan the subvolume for a changed quota setting.",
  95         NULL
  96 };
  97
  98 static int cmd_quota_rescan(int argc, char **argv)
  99 {
 100         int ret = quota_ctl(BTRFS_QUOTA_CTL_RESCAN, argc, argv);
 101         if (ret < 0)
 102                 usage(cmd_quota_rescan_usage);
 103         return ret;
 104 }
 105
 106 const struct cmd_group quota_cmd_group = {
 107         quota_cmd_group_usage, NULL, {
 108                 { "enable", cmd_quota_enable, cmd_quota_enable_usage, NULL, 0 },
 109                 { "disable", cmd_quota_disable, cmd_quota_disable_usage, 0, 0 },
 110                 { "rescan", cmd_quota_rescan, cmd_quota_rescan_usage, NULL, 0 },
 111                 { 0, 0, 0, 0, 0 }
 112         }
 113 };
 114
 115 int cmd_quota(int argc, char **argv)
 116 {
 117         return handle_command_group(&quota_cmd_group, argc, argv);
 118 }