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grub/util/deviceiter.c

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/* deviceiter.c - iterate over system devices */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <dirent.h>
#include <grub/util/misc.h>
#include <grub/util/deviceiter.h>
#include <grub/list.h>
#include <grub/misc.h>
#include <grub/emu/misc.h>
#ifdef __linux__
# if !defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))
/* Maybe libc doesn't have large file support. */
# include <linux/unistd.h> /* _llseek */
# endif /* (GLIBC < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR < 1)) */
# include <sys/ioctl.h> /* ioctl */
# ifndef HDIO_GETGEO
# define HDIO_GETGEO 0x0301 /* get device geometry */
/* If HDIO_GETGEO is not defined, it is unlikely that hd_geometry is
defined. */
struct hd_geometry
{
unsigned char heads;
unsigned char sectors;
unsigned short cylinders;
unsigned long start;
};
# endif /* ! HDIO_GETGEO */
# ifndef FLOPPY_MAJOR
# define FLOPPY_MAJOR 2 /* the major number for floppy */
# endif /* ! FLOPPY_MAJOR */
# ifndef MAJOR
# define MAJOR(dev) \
({ \
unsigned long long __dev = (dev); \
(unsigned) ((__dev >> 8) & 0xfff) \
| ((unsigned int) (__dev >> 32) & ~0xfff); \
})
# endif /* ! MAJOR */
# ifndef MINOR
# define MINOR(dev) \
({ \
unsigned long long __dev = (dev); \
(unsigned) (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); \
})
# endif /* ! MINOR */
# ifndef CDROM_GET_CAPABILITY
# define CDROM_GET_CAPABILITY 0x5331 /* get capabilities */
# endif /* ! CDROM_GET_CAPABILITY */
# ifndef BLKGETSIZE
# define BLKGETSIZE _IO(0x12,96) /* return device size */
# endif /* ! BLKGETSIZE */
#ifdef HAVE_DEVICE_MAPPER
# include <libdevmapper.h>
#endif
#endif /* __linux__ */
/* Use __FreeBSD_kernel__ instead of __FreeBSD__ for compatibility with
kFreeBSD-based non-FreeBSD systems (e.g. GNU/kFreeBSD) */
#if defined(__FreeBSD__) && ! defined(__FreeBSD_kernel__)
# define __FreeBSD_kernel__
#endif
#ifdef __FreeBSD_kernel__
/* Obtain version of kFreeBSD headers */
# include <osreldate.h>
# ifndef __FreeBSD_kernel_version
# define __FreeBSD_kernel_version __FreeBSD_version
# endif
/* Runtime detection of kernel */
# include <sys/utsname.h>
int
get_kfreebsd_version (void)
{
struct utsname uts;
int major;
int minor;
int v[2];
uname (&uts);
sscanf (uts.release, "%d.%d", &major, &minor);
if (major >= 9)
major = 9;
if (major >= 5)
{
v[0] = minor/10; v[1] = minor%10;
}
else
{
v[0] = minor%10; v[1] = minor/10;
}
return major*100000+v[0]*10000+v[1]*1000;
}
#endif /* __FreeBSD_kernel__ */
#if defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
# include <sys/ioctl.h> /* ioctl */
# include <sys/disklabel.h>
# include <sys/cdio.h> /* CDIOCCLRDEBUG */
# if defined(__FreeBSD_kernel__)
# include <sys/param.h>
# if __FreeBSD_kernel_version >= 500040
# include <sys/disk.h>
# endif
# endif /* __FreeBSD_kernel__ */
#endif /* __FreeBSD_kernel__ || __NetBSD__ || __OpenBSD__ */
#ifdef HAVE_OPENDISK
# include <util.h>
#endif /* HAVE_OPENDISK */
#ifdef __linux__
/* Check if we have devfs support. */
static int
have_devfs (void)
{
struct stat st;
return stat ("/dev/.devfsd", &st) == 0;
}
#endif /* __linux__ */
/* These three functions are quite different among OSes. */
static void
get_floppy_disk_name (char *name, int unit)
{
#if defined(__linux__)
/* GNU/Linux */
if (have_devfs ())
sprintf (name, "/dev/floppy/%d", unit);
else
sprintf (name, "/dev/fd%d", unit);
#elif defined(__GNU__)
/* GNU/Hurd */
sprintf (name, "/dev/fd%d", unit);
#elif defined(__FreeBSD_kernel__)
/* kFreeBSD */
if (get_kfreebsd_version () >= 400000)
sprintf (name, "/dev/fd%d", unit);
else
sprintf (name, "/dev/rfd%d", unit);
#elif defined(__NetBSD__)
/* NetBSD */
/* opendisk() doesn't work for floppies. */
sprintf (name, "/dev/rfd%da", unit);
#elif defined(__OpenBSD__)
/* OpenBSD */
sprintf (name, "/dev/rfd%dc", unit);
#elif defined(__QNXNTO__)
/* QNX RTP */
sprintf (name, "/dev/fd%d", unit);
#elif defined(__CYGWIN__)
/* Cygwin */
sprintf (name, "/dev/fd%d", unit);
#elif defined(__MINGW32__)
(void) unit;
*name = 0;
#else
# warning "BIOS floppy drives cannot be guessed in your operating system."
/* Set NAME to a bogus string. */
*name = 0;
#endif
}
static void
get_ide_disk_name (char *name, int unit)
{
#if defined(__linux__)
/* GNU/Linux */
sprintf (name, "/dev/hd%c", unit + 'a');
#elif defined(__GNU__)
/* GNU/Hurd */
sprintf (name, "/dev/hd%d", unit);
#elif defined(__FreeBSD_kernel__)
/* kFreeBSD */
if (get_kfreebsd_version () >= 400000)
sprintf (name, "/dev/ad%d", unit);
else
sprintf (name, "/dev/rwd%d", unit);
#elif defined(__NetBSD__) && defined(HAVE_OPENDISK)
/* NetBSD */
char shortname[16];
int fd;
sprintf (shortname, "wd%d", unit);
fd = opendisk (shortname, O_RDONLY, name,
16, /* length of NAME */
0 /* char device */
);
close (fd);
#elif defined(__OpenBSD__)
/* OpenBSD */
sprintf (name, "/dev/rwd%dc", unit);
#elif defined(__QNXNTO__)
/* QNX RTP */
/* Actually, QNX RTP doesn't distinguish IDE from SCSI, so this could
contain SCSI disks. */
sprintf (name, "/dev/hd%d", unit);
#elif defined(__CYGWIN__)
/* Cygwin emulates all disks as /dev/sdX. */
(void) unit;
*name = 0;
#elif defined(__MINGW32__)
sprintf (name, "//./PHYSICALDRIVE%d", unit);
#else
# warning "BIOS IDE drives cannot be guessed in your operating system."
/* Set NAME to a bogus string. */
*name = 0;
#endif
}
static void
get_scsi_disk_name (char *name, int unit)
{
#if defined(__linux__)
/* GNU/Linux */
sprintf (name, "/dev/sd%c", unit + 'a');
#elif defined(__GNU__)
/* GNU/Hurd */
sprintf (name, "/dev/sd%d", unit);
#elif defined(__FreeBSD_kernel__)
/* kFreeBSD */
if (get_kfreebsd_version () >= 400000)
sprintf (name, "/dev/da%d", unit);
else
sprintf (name, "/dev/rda%d", unit);
#elif defined(__NetBSD__) && defined(HAVE_OPENDISK)
/* NetBSD */
char shortname[16];
int fd;
sprintf (shortname, "sd%d", unit);
fd = opendisk (shortname, O_RDONLY, name,
16, /* length of NAME */
0 /* char device */
);
close (fd);
#elif defined(__OpenBSD__)
/* OpenBSD */
sprintf (name, "/dev/rsd%dc", unit);
#elif defined(__QNXNTO__)
/* QNX RTP */
/* QNX RTP doesn't distinguish SCSI from IDE, so it is better to
disable the detection of SCSI disks here. */
*name = 0;
#elif defined(__CYGWIN__)
/* Cygwin emulates all disks as /dev/sdX. */
sprintf (name, "/dev/sd%c", unit + 'a');
#elif defined(__MINGW32__)
(void) unit;
*name = 0;
#else
# warning "BIOS SCSI drives cannot be guessed in your operating system."
/* Set NAME to a bogus string. */
*name = 0;
#endif
}
#ifdef __linux__
static void
get_virtio_disk_name (char *name, int unit)
{
#ifdef __sparc__
sprintf (name, "/dev/vdisk%c", unit + 'a');
#else
sprintf (name, "/dev/vd%c", unit + 'a');
#endif
}
static void
get_dac960_disk_name (char *name, int controller, int drive)
{
sprintf (name, "/dev/rd/c%dd%d", controller, drive);
}
static void
get_acceleraid_disk_name (char *name, int controller, int drive)
{
sprintf (name, "/dev/rs/c%dd%d", controller, drive);
}
static void
get_ataraid_disk_name (char *name, int unit)
{
sprintf (name, "/dev/ataraid/d%c", unit + '0');
}
static void
get_i2o_disk_name (char *name, char unit)
{
sprintf (name, "/dev/i2o/hd%c", unit);
}
static void
get_cciss_disk_name (char *name, int controller, int drive)
{
sprintf (name, "/dev/cciss/c%dd%d", controller, drive);
}
static void
get_ida_disk_name (char *name, int controller, int drive)
{
sprintf (name, "/dev/ida/c%dd%d", controller, drive);
}
static void
get_mmc_disk_name (char *name, int unit)
{
sprintf (name, "/dev/mmcblk%d", unit);
}
static void
get_xvd_disk_name (char *name, int unit)
{
sprintf (name, "/dev/xvd%c", unit + 'a');
}
#endif
static struct seen_device
{
struct seen_device *next;
const char *name;
} *seen;
/* Check if DEVICE can be read. Skip any DEVICE that we have already seen.
If an error occurs, return zero, otherwise return non-zero. */
static int
check_device_readable_unique (const char *device)
{
char *real_device;
char buf[512];
FILE *fp;
struct seen_device *seen_elt;
/* If DEVICE is empty, just return error. */
if (*device == 0)
return 0;
/* Have we seen this device already? */
real_device = canonicalize_file_name (device);
if (! real_device)
return 0;
if (grub_named_list_find (GRUB_AS_NAMED_LIST (seen), real_device))
{
grub_dprintf ("deviceiter", "Already seen %s (%s)\n",
device, real_device);
goto fail;
}
fp = fopen (device, "r");
if (! fp)
{
switch (errno)
{
#ifdef ENOMEDIUM
case ENOMEDIUM:
# if 0
/* At the moment, this finds only CDROMs, which can't be
read anyway, so leave it out. Code should be
reactivated if `removable disks' and CDROMs are
supported. */
/* Accept it, it may be inserted. */
return 1;
# endif
break;
#endif /* ENOMEDIUM */
default:
/* Break case and leave. */
break;
}
/* Error opening the device. */
goto fail;
}
/* Make sure CD-ROMs don't get assigned a BIOS disk number
before SCSI disks! */
#ifdef __linux__
# ifdef CDROM_GET_CAPABILITY
if (ioctl (fileno (fp), CDROM_GET_CAPABILITY, 0) >= 0)
goto fail;
# else /* ! CDROM_GET_CAPABILITY */
/* Check if DEVICE is a CD-ROM drive by the HDIO_GETGEO ioctl. */
{
struct hd_geometry hdg;
struct stat st;
if (fstat (fileno (fp), &st))
goto fail;
/* If it is a block device and isn't a floppy, check if HDIO_GETGEO
succeeds. */
if (S_ISBLK (st.st_mode)
&& MAJOR (st.st_rdev) != FLOPPY_MAJOR
&& ioctl (fileno (fp), HDIO_GETGEO, &hdg))
goto fail;
}
# endif /* ! CDROM_GET_CAPABILITY */
#endif /* __linux__ */
#if defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
# ifdef CDIOCCLRDEBUG
if (ioctl (fileno (fp), CDIOCCLRDEBUG, 0) >= 0)
goto fail;
# endif /* CDIOCCLRDEBUG */
#endif /* __FreeBSD_kernel__ || __NetBSD__ || __OpenBSD__ */
/* Attempt to read the first sector. */
if (fread (buf, 1, 512, fp) != 512)
{
fclose (fp);
goto fail;
}
/* Remember that we've seen this device. */
seen_elt = xmalloc (sizeof (*seen_elt));
seen_elt->name = real_device; /* steal memory */
grub_list_push (GRUB_AS_LIST_P (&seen), GRUB_AS_LIST (seen_elt));
fclose (fp);
return 1;
fail:
free (real_device);
return 0;
}
static void
clear_seen_devices (void)
{
while (seen)
{
struct seen_device *seen_elt = seen;
seen = seen->next;
free (seen_elt);
}
seen = NULL;
}
#ifdef __linux__
struct device
{
char *stable;
char *kernel;
};
/* Sort by the kernel name for preference since that most closely matches
older device.map files, but sort by stable by-id names as a fallback.
This is because /dev/disk/by-id/ usually has a few alternative
identifications of devices (e.g. ATA vs. SATA).
check_device_readable_unique will ensure that we only get one for any
given disk, but sort the list so that the choice of which one we get is
stable. */
static int
compare_devices (const void *a, const void *b)
{
const struct device *left = (const struct device *) a;
const struct device *right = (const struct device *) b;
if (left->kernel && right->kernel)
{
int ret = strcmp (left->kernel, right->kernel);
if (ret)
return ret;
}
return strcmp (left->stable, right->stable);
}
#endif /* __linux__ */
void
grub_util_iterate_devices (int NESTED_FUNC_ATTR (*hook) (const char *, int),
int floppy_disks)
{
int i;
clear_seen_devices ();
/* Floppies. */
for (i = 0; i < floppy_disks; i++)
{
char name[16];
struct stat st;
get_floppy_disk_name (name, i);
if (stat (name, &st) < 0)
break;
/* In floppies, write the map, whether check_device_readable_unique
succeeds or not, because the user just may not insert floppies. */
if (hook (name, 1))
goto out;
}
#ifdef __linux__
{
DIR *dir = opendir ("/dev/disk/by-id");
if (dir)
{
struct dirent *entry;
struct device *devs;
size_t devs_len = 0, devs_max = 1024, i;
devs = xmalloc (devs_max * sizeof (*devs));
/* Dump all the directory entries into names, resizing if
necessary. */
for (entry = readdir (dir); entry; entry = readdir (dir))
{
/* Skip current and parent directory entries. */
if (strcmp (entry->d_name, ".") == 0 ||
strcmp (entry->d_name, "..") == 0)
continue;
/* Skip partition entries. */
if (strstr (entry->d_name, "-part"))
continue;
/* Skip device-mapper entries; we'll handle the ones we want
later. */
if (strncmp (entry->d_name, "dm-", sizeof ("dm-") - 1) == 0)
continue;
/* Skip RAID entries; they are handled by upper layers. */
if (strncmp (entry->d_name, "md-", sizeof ("md-") - 1) == 0)
continue;
if (devs_len >= devs_max)
{
devs_max *= 2;
devs = xrealloc (devs, devs_max * sizeof (*devs));
}
devs[devs_len].stable =
xasprintf ("/dev/disk/by-id/%s", entry->d_name);
devs[devs_len].kernel =
canonicalize_file_name (devs[devs_len].stable);
devs_len++;
}
qsort (devs, devs_len, sizeof (*devs), &compare_devices);
closedir (dir);
/* Now add all the devices in sorted order. */
for (i = 0; i < devs_len; ++i)
{
if (check_device_readable_unique (devs[i].stable))
{
if (hook (devs[i].stable, 0))
goto out;
}
free (devs[i].stable);
free (devs[i].kernel);
}
free (devs);
}
}
if (have_devfs ())
{
i = 0;
while (1)
{
char discn[32];
char name[PATH_MAX];
struct stat st;
/* Linux creates symlinks "/dev/discs/discN" for convenience.
The way to number disks is the same as GRUB's. */
sprintf (discn, "/dev/discs/disc%d", i++);
if (stat (discn, &st) < 0)
break;
if (realpath (discn, name))
{
strcat (name, "/disc");
if (hook (name, 0))
goto out;
}
}
goto out;
}
#endif /* __linux__ */
/* IDE disks. */
for (i = 0; i < 96; i++)
{
char name[16];
get_ide_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
#ifdef __linux__
/* Virtio disks. */
for (i = 0; i < 26; i++)
{
char name[16];
get_virtio_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
/* ATARAID disks. */
for (i = 0; i < 8; i++)
{
char name[20];
get_ataraid_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
/* Xen virtual block devices. */
for (i = 0; i < 26; i++)
{
char name[16];
get_xvd_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
#endif /* __linux__ */
/* The rest is SCSI disks. */
for (i = 0; i < 48; i++)
{
char name[16];
get_scsi_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
#ifdef __linux__
/* This is for DAC960 - we have
/dev/rd/c<controller>d<logical drive>p<partition>.
DAC960 driver currently supports up to 8 controllers, 32 logical
drives, and 7 partitions. */
{
int controller, drive;
for (controller = 0; controller < 8; controller++)
{
for (drive = 0; drive < 15; drive++)
{
char name[24];
get_dac960_disk_name (name, controller, drive);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
}
}
/* This is for Mylex Acceleraid - we have
/dev/rd/c<controller>d<logical drive>p<partition>. */
{
int controller, drive;
for (controller = 0; controller < 8; controller++)
{
for (drive = 0; drive < 15; drive++)
{
char name[24];
get_acceleraid_disk_name (name, controller, drive);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
}
}
/* This is for CCISS - we have
/dev/cciss/c<controller>d<logical drive>p<partition>. */
{
int controller, drive;
for (controller = 0; controller < 3; controller++)
{
for (drive = 0; drive < 16; drive++)
{
char name[24];
get_cciss_disk_name (name, controller, drive);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
}
}
/* This is for Compaq Intelligent Drive Array - we have
/dev/ida/c<controller>d<logical drive>p<partition>. */
{
int controller, drive;
for (controller = 0; controller < 3; controller++)
{
for (drive = 0; drive < 16; drive++)
{
char name[24];
get_ida_disk_name (name, controller, drive);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
}
}
/* This is for I2O - we have /dev/i2o/hd<logical drive><partition> */
{
char unit;
for (unit = 'a'; unit < 'f'; unit++)
{
char name[24];
get_i2o_disk_name (name, unit);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
}
/* MultiMediaCard (MMC). */
for (i = 0; i < 10; i++)
{
char name[16];
get_mmc_disk_name (name, i);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
goto out;
}
}
# ifdef HAVE_DEVICE_MAPPER
# define dmraid_check(cond, ...) \
if (! (cond)) \
{ \
grub_dprintf ("deviceiter", __VA_ARGS__); \
goto dmraid_end; \
}
/* DM-RAID. */
if (grub_device_mapper_supported ())
{
struct dm_tree *tree = NULL;
struct dm_task *task = NULL;
struct dm_names *names = NULL;
unsigned int next = 0;
void *top_handle, *second_handle;
struct dm_tree_node *root, *top, *second;
/* Build DM tree for all devices. */
tree = dm_tree_create ();
dmraid_check (tree, "dm_tree_create failed\n");
task = dm_task_create (DM_DEVICE_LIST);
dmraid_check (task, "dm_task_create failed\n");
dmraid_check (dm_task_run (task), "dm_task_run failed\n");
names = dm_task_get_names (task);
dmraid_check (names, "dm_task_get_names failed\n");
dmraid_check (names->dev, "No DM devices found\n");
do
{
names = (void *) names + next;
dmraid_check (dm_tree_add_dev (tree, MAJOR (names->dev),
MINOR (names->dev)),
"dm_tree_add_dev (%s) failed\n", names->name);
next = names->next;
}
while (next);
/* Walk the second-level children of the inverted tree; that is, devices
which are directly composed of non-DM devices such as hard disks.
This class includes all DM-RAID disks and excludes all DM-RAID
partitions. */
root = dm_tree_find_node (tree, 0, 0);
top_handle = NULL;
top = dm_tree_next_child (&top_handle, root, 1);
while (top)
{
second_handle = NULL;
second = dm_tree_next_child (&second_handle, top, 1);
while (second)
{
const char *node_name, *node_uuid;
char *name;
node_name = dm_tree_node_get_name (second);
dmraid_check (node_name, "dm_tree_node_get_name failed\n");
node_uuid = dm_tree_node_get_uuid (second);
dmraid_check (node_uuid, "dm_tree_node_get_uuid failed\n");
if (strncmp (node_uuid, "DMRAID-", 7) != 0)
{
grub_dprintf ("deviceiter", "%s is not DM-RAID\n", node_name);
goto dmraid_next_child;
}
name = xasprintf ("/dev/mapper/%s", node_name);
if (check_device_readable_unique (name))
{
if (hook (name, 0))
{
free (name);
if (task)
dm_task_destroy (task);
if (tree)
dm_tree_free (tree);
goto out;
}
}
free (name);
dmraid_next_child:
second = dm_tree_next_child (&second_handle, top, 1);
}
top = dm_tree_next_child (&top_handle, root, 1);
}
dmraid_end:
if (task)
dm_task_destroy (task);
if (tree)
dm_tree_free (tree);
}
# endif /* HAVE_DEVICE_MAPPER */
#endif /* __linux__ */
out:
clear_seen_devices ();
}
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