vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

* configure.ac: Check for Linux device-mapper support.

Browse source 
* util/hostdisk.c (device_is_mapped): New function.
(find_partition_start): New function, partly broken out from
linux_find_partition and grub_util_biosdisk_get_grub_dev but with
device-mapper support added.
(linux_find_partition): Use find_partition_start.
(convert_system_partition_to_system_disk): Add `st' argument.
Support Linux /dev/mapper/* devices if device-mapper support is
available; only DM-RAID devices are understood at present.
(find_system_device): Add `st' argument.  Pass it to
convert_system_partition_to_system_disk.
(grub_util_biosdisk_get_grub_dev): Pass stat result to
find_system_device and convert_system_partition_to_system_disk.  Use
find_partition_start.
* conf/common.rmk (grub_mkdevicemap_SOURCES): Add kern/env.c,
kern/err.c, kern/list.c, kern/misc.c, and kern/emu/mm.c.
* util/deviceiter.c [__linux__]: Define MINOR.
(grub_util_iterate_devices): Add support for DM-RAID disk devices.
* util/mkdevicemap.c (grub_putchar): New function.
(grub_getkey): New function.
(grub_refresh): New function.
(main): Set debug=all if -v -v is used.
This commit is contained in:
Colin Watson 2010-05-18 12:33:35 +01:00
commit 74cbf5bdcb
6 changed files with 455 additions and 61 deletions
Download patch file Download diff file Expand all files Collapse all files

308
kern/emu/hostdisk.c
View file

@ -98,6 +98,10 @@ struct hd_geometry
# include <sys/disk.h>
#endif
#ifdef HAVE_DEVICE_MAPPER
# include <libdevmapper.h>
#endif
#if defined(__NetBSD__)
# include <sys/ioctl.h>
# include <sys/disklabel.h> /* struct disklabel */
@ -312,6 +316,140 @@ grub_util_biosdisk_open (const char *name, grub_disk_t disk)
return GRUB_ERR_NONE;
}
#ifdef HAVE_DEVICE_MAPPER
static int
device_is_mapped (const char *dev)
{
struct stat st;
if (stat (dev, &st) < 0)
return 0;
return dm_is_dm_major (major (st.st_rdev));
}
#endif /* HAVE_DEVICE_MAPPER */
#if defined(__linux__) || defined(__CYGWIN__) || defined(__NetBSD__)
static grub_disk_addr_t
find_partition_start (const char *dev)
{
int fd;
# if !defined(__NetBSD__)
struct hd_geometry hdg;
# else /* defined(__NetBSD__) */
struct disklabel label;
int index;
# endif /* !defined(__NetBSD__) */
# ifdef HAVE_DEVICE_MAPPER
if (device_is_mapped (dev)) {
struct dm_task *task = NULL;
grub_uint64_t start, length;
char *target_type, *params, *space;
grub_disk_addr_t partition_start;
/* If any device-mapper operation fails, we fall back silently to
HDIO_GETGEO. */
task = dm_task_create (DM_DEVICE_TABLE);
if (! task)
{
grub_dprintf ("hostdisk", "dm_task_create failed\n");
goto devmapper_fail;
}
if (! dm_task_set_name (task, dev))
{
grub_dprintf ("hostdisk", "dm_task_set_name failed\n");
goto devmapper_fail;
}
if (! dm_task_run (task))
{
grub_dprintf ("hostdisk", "dm_task_run failed\n");
goto devmapper_fail;
}
dm_get_next_target (task, NULL, &start, &length, &target_type, &params);
if (! target_type)
{
grub_dprintf ("hostdisk", "no dm target\n");
goto devmapper_fail;
}
if (strcmp (target_type, "linear") != 0)
{
grub_dprintf ("hostdisk", "ignoring dm target %s (not linear)\n",
target_type);
goto devmapper_fail;
}
if (! params)
{
grub_dprintf ("hostdisk", "no dm params\n");
goto devmapper_fail;
}
/* The params string for a linear target looks like this:
DEVICE-NAME START-SECTOR
Parse this out. */
space = strchr (params, ' ');
if (! space)
goto devmapper_fail;
errno = 0;
partition_start = strtoull (space + 1, NULL, 10);
if (errno == 0)
{
grub_dprintf ("hostdisk", "dm %s starts at %llu\n",
dev, (unsigned long long) partition_start);
dm_task_destroy (task);
return partition_start;
}
devmapper_fail:
if (task)
dm_task_destroy (task);
}
# endif /* HAVE_DEVICE_MAPPER */
fd = open (dev, O_RDONLY);
if (fd == -1)
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot open `%s' while attempting to get disk geometry", dev);
return 0;
}
# if !defined(__NetBSD__)
if (ioctl (fd, HDIO_GETGEO, &hdg))
# else /* defined(__NetBSD__) */
configure_device_driver (fd);
if (ioctl (fd, DIOCGDINFO, &label) == -1)
# endif /* !defined(__NetBSD__) */
{
grub_error (GRUB_ERR_BAD_DEVICE,
"cannot get disk geometry of `%s'", dev);
close (fd);
return 0;
}
close (fd);
# if !defined(__NetBSD__)
return hdg.start;
# else /* defined(__NetBSD__) */
/* Since dev and convert_system_partition_to_system_disk (dev) are
* different, we know that dev is of the form /dev/r[wsc]d[0-9]+[a-z]
* and in particular it cannot be a floppy device. */
index = dev[strlen(dev) - 1] - 'a';
if (index >= label.d_npartitions)
{
grub_error (GRUB_ERR_BAD_DEVICE,
"no disk label entry for `%s'", dev);
return 0;
}
return (grub_disk_addr_t) label.d_partitions[index].p_offset;
# endif /* !defined(__NetBSD__) */
}
#endif /* __linux__ || __CYGWIN__ */
#ifdef __linux__
/* Cache of partition start sectors for each disk. */
struct linux_partition_cache
@ -365,28 +503,26 @@ linux_find_partition (char *dev, unsigned long sector)
for (i = 1; i < 10000; i++)
{
int fd;
struct hd_geometry hdg;
grub_disk_addr_t start;
sprintf (p, format, i);
fd = open (real_dev, O_RDONLY);
if (fd == -1)
return 0;
if (ioctl (fd, HDIO_GETGEO, &hdg))
{
close (fd);
return 0;
}
close (fd);
if (hdg.start == sector)
start = find_partition_start (real_dev);
/* We don't care about errors here. */
grub_errno = GRUB_ERR_NONE;
if (start == sector)
{
struct linux_partition_cache *new_cache_item;
new_cache_item = xmalloc (sizeof *new_cache_item);
new_cache_item->dev = xstrdup (dev);
new_cache_item->start = hdg.start;
new_cache_item->start = start;
new_cache_item->partno = i;
grub_list_push (GRUB_AS_LIST_P (&linux_partition_cache_list),
GRUB_AS_LIST (new_cache_item));
@ -877,7 +1013,7 @@ make_device_name (int drive, int dos_part, int bsd_part)
}
static char *
convert_system_partition_to_system_disk (const char *os_dev)
convert_system_partition_to_system_disk (const char *os_dev, struct stat *st)
{
#if defined(__linux__)
char *path = xmalloc (PATH_MAX);
@ -995,6 +1131,96 @@ convert_system_partition_to_system_disk (const char *os_dev)
p[4] = '\0';
return path;
}
#ifdef HAVE_DEVICE_MAPPER
/* If this is a DM-RAID device. */
if ((strncmp ("mapper/", p, 7) == 0))
{
static struct dm_tree *tree = NULL;
uint32_t maj, min;
struct dm_tree_node *node, *child;
void *handle;
const char *node_uuid, *mapper_name, *child_uuid, *child_name;
if (! tree)
tree = dm_tree_create ();
if (! tree)
{
grub_dprintf ("hostdisk", "dm_tree_create failed\n");
return NULL;
}
maj = major (st->st_rdev);
min = minor (st->st_rdev);
if (! dm_tree_add_dev (tree, maj, min))
{
grub_dprintf ("hostdisk", "dm_tree_add_dev failed\n");
return NULL;
}
node = dm_tree_find_node (tree, maj, min);
if (! node)
{
grub_dprintf ("hostdisk", "dm_tree_find_node failed\n");
return NULL;
}
node_uuid = dm_tree_node_get_uuid (node);
if (! node_uuid)
{
grub_dprintf ("hostdisk", "%s has no DM uuid\n", path);
return NULL;
}
else if (strncmp (node_uuid, "DMRAID-", 7) != 0)
{
grub_dprintf ("hostdisk", "%s is not DM-RAID\n", path);
return NULL;
}
handle = NULL;
mapper_name = NULL;
/* Counter-intuitively, device-mapper refers to the disk-like
device containing a DM-RAID partition device as a "child" of
the partition device. */
child = dm_tree_next_child (&handle, node, 0);
if (! child)
{
grub_dprintf ("hostdisk", "%s has no DM children\n", path);
goto devmapper_out;
}
child_uuid = dm_tree_node_get_uuid (child);
if (! child_uuid)
{
grub_dprintf ("hostdisk", "%s child has no DM uuid\n", path);
goto devmapper_out;
}
else if (strncmp (child_uuid, "DMRAID-", 7) != 0)
{
grub_dprintf ("hostdisk", "%s child is not DM-RAID\n", path);
goto devmapper_out;
}
child_name = dm_tree_node_get_name (child);
if (! child_name)
{
grub_dprintf ("hostdisk", "%s child has no DM name\n", path);
goto devmapper_out;
}
mapper_name = child_name;
devmapper_out:
if (! mapper_name)
{
/* This is a DM-RAID disk, not a partition. */
mapper_name = dm_tree_node_get_name (node);
if (! mapper_name)
{
grub_dprintf ("hostdisk", "%s has no DM name\n", path);
return NULL;
}
}
return xasprintf ("/dev/mapper/%s", mapper_name);
}
#endif /* HAVE_DEVICE_MAPPER */
}
return path;
@ -1091,12 +1317,12 @@ device_is_wholedisk (const char *os_dev)
#endif /* defined(__NetBSD__) */
static int
find_system_device (const char *os_dev)
find_system_device (const char *os_dev, struct stat *st)
{
unsigned int i;
char *os_disk;
os_disk = convert_system_partition_to_system_disk (os_dev);
os_disk = convert_system_partition_to_system_disk (os_dev, st);
if (! os_disk)
return -1;
@ -1130,7 +1356,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
return 0;
}
drive = find_system_device (os_dev);
drive = find_system_device (os_dev, &st);
if (drive < 0)
{
grub_error (GRUB_ERR_UNKNOWN_DEVICE,
@ -1138,8 +1364,8 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
return 0;
}
if (grub_strcmp (os_dev, convert_system_partition_to_system_disk (os_dev))
== 0)
if (grub_strcmp (os_dev,
convert_system_partition_to_system_disk (os_dev, &st)) == 0)
return make_device_name (drive, -1, -1);
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) || defined(__NetBSD__)
@ -1164,15 +1390,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
{
char *name;
grub_disk_t disk;
int fd;
# if !defined(__NetBSD__)
struct hd_geometry hdg;
typeof (hdg.start) p_offset;
# else /* defined(__NetBSD__) */
struct disklabel label;
int index;
u_int32_t p_offset;
# endif /* !defined(__NetBSD__) */
grub_disk_addr_t start;
int dos_part = -1;
int bsd_part = -1;
auto int find_partition (grub_disk_t dsk,
@ -1187,7 +1405,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
part_start = grub_partition_get_start (partition);
if (p_offset == part_start)
if (start == part_start)
{
if (partition->parent)
{
@ -1218,46 +1436,16 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
index = os_dev[strlen(os_dev) - 1] - 'a';
# endif /* !defined(__NetBSD__) */
fd = open (os_dev, O_RDONLY);
if (fd == -1)
start = find_partition_start (os_dev);
if (grub_errno != GRUB_ERR_NONE)
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot open `%s' while attempting to get disk geometry", os_dev);
free (name);
return 0;
}
# if !defined(__NetBSD__)
if (ioctl (fd, HDIO_GETGEO, &hdg))
# else /* defined(__NetBSD__) */
configure_device_driver (fd);
if (ioctl (fd, DIOCGDINFO, &label) == -1)
# endif /* !defined(__NetBSD__) */
{
grub_error (GRUB_ERR_BAD_DEVICE,
"cannot get disk geometry of `%s'", os_dev);
close (fd);
free (name);
return 0;
}
grub_util_info ("%s starts from %lu", os_dev, start);
close (fd);
# if !defined(__NetBSD__)
p_offset = hdg.start;
# else /* defined(__NetBSD__) */
if (index >= label.d_npartitions)
{
grub_error (GRUB_ERR_BAD_DEVICE,
"no disk label entry for `%s'", os_dev);
free (name);
return 0;
}
p_offset = label.d_partitions[index].p_offset;
# endif /* !defined(__NetBSD__) */
grub_util_info ("%s starts from %lu", os_dev, p_offset);
if (p_offset == 0 && device_is_wholedisk (os_dev))
if (start == 0 && device_is_wholedisk (os_dev))
return name;
grub_util_info ("opening the device %s", name);