1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 typedef int (*block_dev_func_t)(const char *dev,
33 char ***r, int *size, int *alloc);
35 /* Execute a given function for each discovered block device */
37 foreach_block_device (block_dev_func_t func)
40 int size = 0, alloc = 0;
46 dir = opendir ("/sys/block");
48 reply_with_perror ("opendir: /sys/block");
53 while ((d = readdir (dir)) != NULL) {
54 if (strncmp (d->d_name, "sd", 2) == 0 ||
55 strncmp (d->d_name, "hd", 2) == 0 ||
56 strncmp (d->d_name, "vd", 2) == 0 ||
57 strncmp (d->d_name, "sr", 2) == 0) {
59 snprintf (dev_path, sizeof dev_path, "/dev/%s", d->d_name);
61 /* RHBZ#514505: Some versions of qemu <= 0.10 add a
62 * CD-ROM device even though we didn't request it. Try to
63 * detect this by seeing if the device contains media.
65 int fd = open (dev_path, O_RDONLY);
72 /* Call the map function for this device */
73 if((*func)(d->d_name, &r, &size, &alloc) != 0) {
80 /* Check readdir didn't fail */
82 reply_with_perror ("readdir: /sys/block");
83 free_stringslen(r, size);
87 /* Close the directory handle */
88 if (closedir (dir) == -1) {
89 reply_with_perror ("closedir: /sys/block");
90 free_stringslen(r, size);
94 /* Free the result list on error */
96 free_stringslen(r, size);
100 /* Sort the devices */
101 sort_strings (r, size);
103 /* NULL terminate the list */
104 if (add_string (&r, &size, &alloc, NULL) == -1) {
111 /* Add a device to the list of devices */
113 add_device(const char *device,
114 char ***const r, int *const size, int *const alloc)
117 snprintf (dev_path, sizeof dev_path, "/dev/%s", device);
119 if (add_string (r, size, alloc, dev_path) == -1) {
127 do_list_devices (void)
129 return foreach_block_device(add_device);
133 add_partitions(const char *device,
134 char ***const r, int *const size, int *const alloc)
138 /* Open the device's directory under /sys/block */
139 snprintf (devdir, sizeof devdir, "/sys/block/%s", device);
141 DIR *dir = opendir (devdir);
143 reply_with_perror ("opendir: %s", devdir);
144 free_stringslen (*r, *size);
148 /* Look in /sys/block/<device>/ for entries starting with <device>
149 * e.g. /sys/block/sda/sda1
153 while ((d = readdir (dir)) != NULL) {
154 if (strncmp (d->d_name, device, strlen (device)) == 0) {
156 snprintf (part, sizeof part, "/dev/%s", d->d_name);
158 if (add_string (r, size, alloc, part) == -1) {
165 /* Check if readdir failed */
167 reply_with_perror ("readdir: %s", devdir);
168 free_stringslen(*r, *size);
172 /* Close the directory handle */
173 if (closedir (dir) == -1) {
174 reply_with_perror ("closedir: /sys/block/%s", device);
175 free_stringslen (*r, *size);
183 do_list_partitions (void)
185 return foreach_block_device(add_partitions);
189 do_mkfs (char *fstype, char *device)
194 IS_DEVICE (device, -1);
196 r = command (NULL, &err, "/sbin/mkfs", "-t", fstype, device, NULL);
198 reply_with_error ("mkfs: %s", err);