diff options
Diffstat (limited to 'grub-core/osdep/devmapper/hostdisk.c')
| -rw-r--r-- | grub-core/osdep/devmapper/hostdisk.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/grub-core/osdep/devmapper/hostdisk.c b/grub-core/osdep/devmapper/hostdisk.c new file mode 100644 index 0000000..a8afc0c --- /dev/null +++ b/grub-core/osdep/devmapper/hostdisk.c @@ -0,0 +1,230 @@ +#include <config-util.h> + +#include <grub/disk.h> +#include <grub/partition.h> +#include <grub/msdos_partition.h> +#include <grub/types.h> +#include <grub/err.h> +#include <grub/emu/misc.h> +#include <grub/emu/hostdisk.h> +#include <grub/emu/getroot.h> +#include <grub/misc.h> +#include <grub/i18n.h> +#include <grub/list.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <assert.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#include <limits.h> + +#if defined(MAJOR_IN_MKDEV) +#include <sys/mkdev.h> +#elif defined(MAJOR_IN_SYSMACROS) +#include <sys/sysmacros.h> +#endif + +#ifdef HAVE_DEVICE_MAPPER +# include <libdevmapper.h> + +static void device_mapper_null_log (int level __attribute__ ((unused)), + const char *file __attribute__ ((unused)), + int line __attribute__ ((unused)), + int dm_errno __attribute__ ((unused)), + const char *f __attribute__ ((unused)), + ...) +{ +} + +int +grub_device_mapper_supported (void) +{ + static int supported = -1; + + if (supported == -1) + { + struct dm_task *dmt; + + /* Suppress annoying log messages. */ + dm_log_with_errno_init (&device_mapper_null_log); + + dmt = dm_task_create (DM_DEVICE_VERSION); + supported = (dmt != NULL); + if (dmt) + dm_task_destroy (dmt); + + /* Restore the original logger. */ + dm_log_with_errno_init (NULL); + } + + return supported; +} + +int +grub_util_device_is_mapped (const char *dev) +{ + struct stat st; + + if (!grub_device_mapper_supported ()) + return 0; + + if (stat (dev, &st) < 0) + return 0; + +#if GRUB_DISK_DEVS_ARE_CHAR + if (! S_ISCHR (st.st_mode)) +#else + if (! S_ISBLK (st.st_mode)) +#endif + return 0; + + return dm_is_dm_major (major (st.st_rdev)); +} + +int +grub_util_device_is_mapped_stat (struct stat *st) +{ +#if GRUB_DISK_DEVS_ARE_CHAR + if (! S_ISCHR (st->st_mode)) +#else + if (! S_ISBLK (st->st_mode)) +#endif + return 0; + + if (!grub_device_mapper_supported ()) + return 0; + + return dm_is_dm_major (major (st->st_rdev)); +} + + +int +grub_util_get_dm_node_linear_info (dev_t dev, + int *maj, int *min, + grub_disk_addr_t *st) +{ + struct dm_task *dmt; + void *next = NULL; + uint64_t length, start; + char *target, *params; + const char *ptr; + int major = 0, minor = 0; + int first = 1; + grub_disk_addr_t partstart = 0; + const char *node_uuid; + + major = major (dev); + minor = minor (dev); + + while (1) + { + dmt = dm_task_create(DM_DEVICE_TABLE); + if (!dmt) + break; + + if (! (dm_task_set_major_minor (dmt, major, minor, 0))) + { + dm_task_destroy (dmt); + break; + } + dm_task_no_open_count(dmt); + if (!dm_task_run(dmt)) + { + dm_task_destroy (dmt); + break; + } + node_uuid = dm_task_get_uuid (dmt); + if (node_uuid && (strncmp (node_uuid, "LVM-", 4) == 0 + || strncmp (node_uuid, "mpath-", 6) == 0)) + { + dm_task_destroy (dmt); + break; + } + + next = dm_get_next_target(dmt, next, &start, &length, + &target, ¶ms); + if (grub_strcmp (target, "linear") != 0) + { + dm_task_destroy (dmt); + break; + } + major = grub_strtoul (params, &ptr, 10); + if (grub_errno) + { + dm_task_destroy (dmt); + grub_errno = GRUB_ERR_NONE; + return 0; + } + if (*ptr != ':') + { + dm_task_destroy (dmt); + return 0; + } + ptr++; + minor = grub_strtoul (ptr, &ptr, 10); + if (grub_errno) + { + grub_errno = GRUB_ERR_NONE; + dm_task_destroy (dmt); + return 0; + } + + if (*ptr != ' ') + { + dm_task_destroy (dmt); + return 0; + } + ptr++; + partstart += grub_strtoull (ptr, &ptr, 10); + if (grub_errno) + { + grub_errno = GRUB_ERR_NONE; + dm_task_destroy (dmt); + return 0; + } + + dm_task_destroy (dmt); + first = 0; + if (!dm_is_dm_major (major)) + break; + } + if (first) + return 0; + if (maj) + *maj = major; + if (min) + *min = minor; + if (st) + *st = partstart; + return 1; +} +#else + +int +grub_util_device_is_mapped (const char *dev __attribute__ ((unused))) +{ + return 0; +} + +int +grub_util_get_dm_node_linear_info (dev_t dev __attribute__ ((unused)), + int *maj __attribute__ ((unused)), + int *min __attribute__ ((unused)), + grub_disk_addr_t *st __attribute__ ((unused))) +{ + return 0; +} + +int +grub_util_device_is_mapped_stat (struct stat *st __attribute__ ((unused))) +{ + return 0; +} + +#endif |