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