/* hostdisk.c - emulate biosdisk */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004,2006,2007,2008,2009,2010 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 . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __linux__ # include /* ioctl */ # include # if !defined(__GLIBC__) || \ ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))) /* Maybe libc doesn't have large file support. */ # include /* _llseek */ # endif /* (GLIBC < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR < 1)) */ # ifndef BLKFLSBUF # define BLKFLSBUF _IO (0x12,97) /* flush buffer cache */ # endif /* ! BLKFLSBUF */ # include /* 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 BLKGETSIZE64 # define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size */ # endif /* ! BLKGETSIZE64 */ #endif /* __linux__ */ #ifdef __CYGWIN__ # include # include /* BLKGETSIZE64 */ # include /* HDIO_GETGEO */ #endif #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) # include /* DIOCGMEDIASIZE */ # include # include # include #include #endif #if defined (__sun__) # include #endif #if defined(__APPLE__) # include #endif #ifdef HAVE_DEVICE_MAPPER # include #endif #if defined(__NetBSD__) # define HAVE_DIOCGDINFO # include # include /* struct disklabel */ # include /* struct dkwedge_info */ #else /* !defined(__NetBSD__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) */ # undef HAVE_DIOCGDINFO #endif /* defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) */ #if defined(__NetBSD__) # ifdef HAVE_GETRAWPARTITION # include /* getrawpartition */ # endif /* HAVE_GETRAWPARTITION */ # include # ifndef RAW_FLOPPY_MAJOR # define RAW_FLOPPY_MAJOR 9 # endif /* ! RAW_FLOPPY_MAJOR */ #endif /* defined(__NetBSD__) */ struct { char *drive; char *device; int device_map; } map[256]; struct grub_util_biosdisk_data { char *dev; int access_mode; int fd; int is_disk; int device_map; }; #ifdef __linux__ /* Check if we have devfs support. */ static int have_devfs (void) { static int dev_devfsd_exists = -1; if (dev_devfsd_exists < 0) { struct stat st; dev_devfsd_exists = stat ("/dev/.devfsd", &st) == 0; } return dev_devfsd_exists; } #endif /* __linux__ */ #if defined(__NetBSD__) /* Adjust device driver parameters. This function should be called just after successfully opening the device. For now, it simply prevents the floppy driver from retrying operations on failure, as otherwise the driver takes a while to abort when there is no floppy in the drive. */ static void configure_device_driver (int fd) { struct stat st; if (fstat (fd, &st) < 0 || ! S_ISCHR (st.st_mode)) return; if (major(st.st_rdev) == RAW_FLOPPY_MAJOR) { int floppy_opts; if (ioctl (fd, FDIOCGETOPTS, &floppy_opts) == -1) return; floppy_opts |= FDOPT_NORETRY; if (ioctl (fd, FDIOCSETOPTS, &floppy_opts) == -1) return; } } #endif /* defined(__NetBSD__) */ static int unescape_cmp (const char *a, const char *b_escaped) { while (*a || *b_escaped) { if (*b_escaped == '\\' && b_escaped[1] != 0) b_escaped++; if (*a < *b_escaped) return -1; if (*a > *b_escaped) return +1; a++; b_escaped++; } if (*a) return +1; if (*b_escaped) return -1; return 0; } static int find_grub_drive (const char *name) { unsigned int i; if (name) { for (i = 0; i < ARRAY_SIZE (map); i++) if (map[i].drive && unescape_cmp (map[i].drive, name) == 0) return i; } return -1; } static int find_free_slot (void) { unsigned int i; for (i = 0; i < sizeof (map) / sizeof (map[0]); i++) if (! map[i].drive) return i; return -1; } static int grub_util_biosdisk_iterate (int (*hook) (const char *name), grub_disk_pull_t pull) { unsigned i; if (pull != GRUB_DISK_PULL_NONE) return 0; for (i = 0; i < sizeof (map) / sizeof (map[0]); i++) if (map[i].drive && hook (map[i].drive)) return 1; return 0; } #if !defined(__MINGW32__) grub_uint64_t grub_util_get_fd_sectors (int fd, const char *name, unsigned *log_secsize) { # if defined(__NetBSD__) struct disklabel label; # elif defined (__sun__) struct dk_minfo minfo; #else unsigned long long nr; # endif unsigned sector_size, log_sector_size; struct stat st; if (fstat (fd, &st) < 0) grub_util_error (_("cannot stat `%s': %s"), name, strerror (errno)); #if defined(__linux__) || defined(__CYGWIN__) || defined(__FreeBSD__) || \ defined(__FreeBSD_kernel__) || defined(__APPLE__) || defined(__NetBSD__) \ || defined (__sun__) # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) || defined(__NetBSD__) || defined (__sun__) if (! S_ISCHR (st.st_mode)) # else if (! S_ISBLK (st.st_mode)) # endif goto fail; # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) if (ioctl (fd, DIOCGMEDIASIZE, &nr)) # elif defined(__APPLE__) if (ioctl (fd, DKIOCGETBLOCKCOUNT, &nr)) # elif defined(__NetBSD__) configure_device_driver (fd); if (ioctl (fd, DIOCGDINFO, &label) == -1) # elif defined (__sun__) if (!ioctl (fd, DKIOCGMEDIAINFO, &minfo)) # else if (ioctl (fd, BLKGETSIZE64, &nr)) # endif goto fail; # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) if (ioctl (fd, DIOCGSECTORSIZE, §or_size)) goto fail; # elif defined(__sun__) sector_size = minfo.dki_lbsize; # elif defined(__NetBSD__) sector_size = label.d_secsize; # else if (ioctl (fd, BLKSSZGET, §or_size)) goto fail; # endif if (sector_size & (sector_size - 1) || !sector_size) goto fail; for (log_sector_size = 0; (1 << log_sector_size) < sector_size; log_sector_size++); if (log_secsize) *log_secsize = log_sector_size; # if defined (__APPLE__) return nr; # elif defined(__NetBSD__) return label.d_secperunit; # elif defined (__sun__) return minfo.dki_capacity; # else if (nr & ((1 << log_sector_size) - 1)) grub_util_error ("%s", _("unaligned device size")); return (nr >> log_sector_size); # endif fail: /* In GNU/Hurd, stat() will return the right size. */ #elif !defined (__GNU__) # warning "No special routine to get the size of a block device is implemented for your OS. This is not possibly fatal." #endif sector_size = 512; log_sector_size = 9; if (log_secsize) *log_secsize = 9; return st.st_size >> 9; } #endif static grub_err_t grub_util_biosdisk_open (const char *name, grub_disk_t disk) { int drive; struct stat st; struct grub_util_biosdisk_data *data; drive = find_grub_drive (name); if (drive < 0) return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no mapping exists for `%s'", name); disk->id = drive; disk->data = data = xmalloc (sizeof (struct grub_util_biosdisk_data)); data->dev = NULL; data->access_mode = 0; data->fd = -1; data->is_disk = 0; data->device_map = map[drive].device_map; /* Get the size. */ #if defined(__MINGW32__) { grub_uint64_t size; size = grub_util_get_disk_size (map[drive].device); if (size % 512) grub_util_error (_("unaligned device size")); disk->total_sectors = size >> 9; grub_util_info ("the size of %s is %llu", name, disk->total_sectors); return GRUB_ERR_NONE; } #else { int fd; fd = open (map[drive].device, O_RDONLY); if (fd == -1) return grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("cannot open `%s': %s"), map[drive].device, strerror (errno)); disk->total_sectors = grub_util_get_fd_sectors (fd, map[drive].device, &disk->log_sector_size); # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) || defined(__NetBSD__) if (fstat (fd, &st) < 0 || ! S_ISCHR (st.st_mode)) # else if (fstat (fd, &st) < 0 || ! S_ISBLK (st.st_mode)) # endif data->is_disk = 1; close (fd); grub_util_info ("the size of %s is %" PRIuGRUB_UINT64_T, name, disk->total_sectors); return GRUB_ERR_NONE; } #endif } int grub_util_device_is_mapped (const char *dev) { #ifdef HAVE_DEVICE_MAPPER struct stat st; if (!grub_device_mapper_supported ()) return 0; if (stat (dev, &st) < 0) return 0; return dm_is_dm_major (major (st.st_rdev)); #else return 0; #endif /* HAVE_DEVICE_MAPPER */ } #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) /* FIXME: geom actually gives us the whole container hierarchy. It can be used more efficiently than this. */ void grub_util_follow_gpart_up (const char *name, grub_disk_addr_t *off_out, char **name_out) { struct gmesh mesh; struct gclass *class; int error; struct ggeom *geom; grub_util_info ("following geom '%s'", name); error = geom_gettree (&mesh); if (error != 0) /* TRANSLATORS: geom is the name of (k)FreeBSD device framework. Usually left untranslated. */ grub_util_error (_("couldn't open geom")); LIST_FOREACH (class, &mesh.lg_class, lg_class) if (strcasecmp (class->lg_name, "part") == 0) break; if (!class) /* TRANSLATORS: geom is the name of (k)FreeBSD device framework. Usually left untranslated. */ grub_util_error (_("couldn't find geom `part' class")); LIST_FOREACH (geom, &class->lg_geom, lg_geom) { struct gprovider *provider; LIST_FOREACH (provider, &geom->lg_provider, lg_provider) if (strcmp (provider->lg_name, name) == 0) { char *name_tmp = xstrdup (geom->lg_name); grub_disk_addr_t off = 0; struct gconfig *config; grub_util_info ("geom '%s' has parent '%s'", name, geom->lg_name); grub_util_follow_gpart_up (name_tmp, &off, name_out); free (name_tmp); LIST_FOREACH (config, &provider->lg_config, lg_config) if (strcasecmp (config->lg_name, "start") == 0) off += strtoull (config->lg_val, 0, 10); if (off_out) *off_out = off; return; } } grub_util_info ("geom '%s' has no parent", name); if (name_out) *name_out = xstrdup (name); if (off_out) *off_out = 0; } grub_disk_addr_t grub_hostdisk_find_partition_start (const char *dev) { grub_disk_addr_t out; if (strncmp (dev, "/dev/", sizeof ("/dev/") - 1) != 0) return 0; grub_util_follow_gpart_up (dev + sizeof ("/dev/") - 1, &out, NULL); return out; } #elif defined(__linux__) || defined(__CYGWIN__) || defined(HAVE_DIOCGDINFO) || defined (__sun__) grub_disk_addr_t grub_hostdisk_find_partition_start (const char *dev) { int fd; #ifdef __sun__ struct extpart_info pinfo; # elif !defined(HAVE_DIOCGDINFO) struct hd_geometry hdg; # else /* defined(HAVE_DIOCGDINFO) */ # if defined(__NetBSD__) struct dkwedge_info dkw; # endif /* defined(__NetBSD__) */ struct disklabel label; int p_index; # endif /* !defined(HAVE_DIOCGDINFO) */ # ifdef HAVE_DEVICE_MAPPER if (grub_util_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, ¶ms); 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, N_("cannot open `%s': %s"), dev, strerror (errno)); return 0; } #if defined(__sun__) if (ioctl (fd, DKIOCEXTPARTINFO, &pinfo)) # elif !defined(HAVE_DIOCGDINFO) if (ioctl (fd, HDIO_GETGEO, &hdg)) # else /* defined(HAVE_DIOCGDINFO) */ # if defined(__NetBSD__) configure_device_driver (fd); /* First handle the case of disk wedges. */ if (ioctl (fd, DIOCGWEDGEINFO, &dkw) == 0) { close (fd); return (grub_disk_addr_t) dkw.dkw_offset; } # endif /* defined(__NetBSD__) */ if (ioctl (fd, DIOCGDINFO, &label) == -1) # endif /* !defined(HAVE_DIOCGDINFO) */ { grub_error (GRUB_ERR_BAD_DEVICE, # if !defined(HAVE_DIOCGDINFO) "cannot get disk geometry of `%s'", dev); # else /* defined(HAVE_DIOCGDINFO) */ "cannot get disk label of `%s'", dev); # endif /* !defined(HAVE_DIOCGDINFO) */ close (fd); return 0; } close (fd); #ifdef __sun__ return pinfo.p_start; # elif !defined(HAVE_DIOCGDINFO) return hdg.start; # else /* defined(HAVE_DIOCGDINFO) */ if (dev[0]) p_index = dev[strlen(dev) - 1] - 'a'; else p_index = -1; if (p_index >= label.d_npartitions || p_index < 0) { grub_error (GRUB_ERR_BAD_DEVICE, "no disk label entry for `%s'", dev); return 0; } return (grub_disk_addr_t) label.d_partitions[p_index].p_offset; # endif /* !defined(HAVE_DIOCGDINFO) */ } #endif /* __linux__ || __CYGWIN__ || HAVE_DIOCGDINFO */ #ifdef __linux__ /* Cache of partition start sectors for each disk. */ struct linux_partition_cache { struct linux_partition_cache *next; struct linux_partition_cache **prev; char *dev; unsigned long start; int partno; }; struct linux_partition_cache *linux_partition_cache_list; static int linux_find_partition (char *dev, grub_disk_addr_t sector) { size_t len = strlen (dev); const char *format; char *p; int i; char real_dev[PATH_MAX]; struct linux_partition_cache *cache; int missing = 0; strcpy(real_dev, dev); if (have_devfs () && strcmp (real_dev + len - 5, "/disc") == 0) { p = real_dev + len - 4; format = "part%d"; } else if (strncmp (real_dev, "/dev/disk/by-id/", sizeof ("/dev/disk/by-id/") - 1) == 0) { p = real_dev + len; format = "-part%d"; } else if (real_dev[len - 1] >= '0' && real_dev[len - 1] <= '9') { p = real_dev + len; format = "p%d"; } else { p = real_dev + len; format = "%d"; } for (cache = linux_partition_cache_list; cache; cache = cache->next) { if (strcmp (cache->dev, dev) == 0 && cache->start == sector) { sprintf (p, format, cache->partno); strcpy (dev, real_dev); return 1; } } for (i = 1; i < 10000; i++) { int fd; grub_disk_addr_t start; sprintf (p, format, i); fd = open (real_dev, O_RDONLY); if (fd == -1) { if (missing++ < 10) continue; else return 0; } missing = 0; close (fd); start = grub_hostdisk_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 = start; new_cache_item->partno = i; grub_list_push (GRUB_AS_LIST_P (&linux_partition_cache_list), GRUB_AS_LIST (new_cache_item)); strcpy (dev, real_dev); return 1; } } return 0; } #endif /* __linux__ */ #if defined(__linux__) && (!defined(__GLIBC__) || \ ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))) /* Maybe libc doesn't have large file support. */ grub_err_t grub_util_fd_seek (int fd, const char *name, grub_uint64_t off) { loff_t offset, result; static int _llseek (uint filedes, ulong hi, ulong lo, loff_t *res, uint wh); _syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo, loff_t *, res, uint, wh); offset = (loff_t) off; if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET)) return grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot seek `%s': %s"), name, strerror (errno)); return GRUB_ERR_NONE; } #else grub_err_t grub_util_fd_seek (int fd, const char *name, grub_uint64_t off) { off_t offset = (off_t) off; if (lseek (fd, offset, SEEK_SET) != offset) return grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot seek `%s': %s"), name, strerror (errno)); return 0; } #endif const char * grub_hostdisk_os_dev_to_grub_drive (const char *os_disk, int add) { unsigned int i; for (i = 0; i < ARRAY_SIZE (map); i++) if (! map[i].device) break; else if (strcmp (map[i].device, os_disk) == 0) return map[i].drive; if (!add) return NULL; if (i == ARRAY_SIZE (map)) /* TRANSLATORS: it refers to the lack of free slots. */ grub_util_error ("%s", _("device count exceeds limit")); map[i].device = xstrdup (os_disk); map[i].drive = xmalloc (sizeof ("hostdisk/") + strlen (os_disk)); strcpy (map[i].drive, "hostdisk/"); strcpy (map[i].drive + sizeof ("hostdisk/") - 1, os_disk); map[i].device_map = 0; return map[i].drive; } static int open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags) { int fd; struct grub_util_biosdisk_data *data = disk->data; #ifdef O_LARGEFILE flags |= O_LARGEFILE; #endif #ifdef O_SYNC flags |= O_SYNC; #endif #ifdef O_FSYNC flags |= O_FSYNC; #endif #ifdef O_BINARY flags |= O_BINARY; #endif #ifdef __linux__ /* Linux has a bug that the disk cache for a whole disk is not consistent with the one for a partition of the disk. */ { int is_partition = 0; char dev[PATH_MAX]; grub_disk_addr_t part_start = 0; part_start = grub_partition_get_start (disk->partition); strcpy (dev, map[disk->id].device); if (disk->partition && sector >= part_start && strncmp (map[disk->id].device, "/dev/", 5) == 0) is_partition = linux_find_partition (dev, part_start); if (data->dev && strcmp (data->dev, dev) == 0 && data->access_mode == (flags & O_ACCMODE)) { grub_dprintf ("hostdisk", "reusing open device `%s'\n", dev); fd = data->fd; } else { free (data->dev); if (data->fd != -1) { if (data->access_mode == O_RDWR || data->access_mode == O_WRONLY) { fsync (data->fd); #ifdef __linux__ if (data->is_disk) ioctl (data->fd, BLKFLSBUF, 0); #endif } close (data->fd); data->fd = -1; } /* Open the partition. */ grub_dprintf ("hostdisk", "opening the device `%s' in open_device()\n", dev); fd = open (dev, flags); if (fd < 0) { grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot open `%s': %s"), dev, strerror (errno)); return -1; } data->dev = xstrdup (dev); data->access_mode = (flags & O_ACCMODE); data->fd = fd; } if (is_partition) sector -= part_start; } #else /* ! __linux__ */ #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) int sysctl_flags, sysctl_oldflags; size_t sysctl_size = sizeof (sysctl_flags); if (sysctlbyname ("kern.geom.debugflags", &sysctl_oldflags, &sysctl_size, NULL, 0)) { grub_error (GRUB_ERR_BAD_DEVICE, "cannot get current flags of sysctl kern.geom.debugflags"); return -1; } sysctl_flags = sysctl_oldflags | 0x10; if (! (sysctl_oldflags & 0x10) && sysctlbyname ("kern.geom.debugflags", NULL , 0, &sysctl_flags, sysctl_size)) { grub_error (GRUB_ERR_BAD_DEVICE, "cannot set flags of sysctl kern.geom.debugflags"); return -1; } #endif if (data->dev && strcmp (data->dev, map[disk->id].device) == 0 && data->access_mode == (flags & O_ACCMODE)) { grub_dprintf ("hostdisk", "reusing open device `%s'\n", data->dev); fd = data->fd; } else { free (data->dev); if (data->fd != -1) { if (data->access_mode == O_RDWR || data->access_mode == O_WRONLY) { fsync (data->fd); #ifdef __linux__ if (data->is_disk) ioctl (data->fd, BLKFLSBUF, 0); #endif } close (data->fd); data->fd = -1; } fd = open (map[disk->id].device, flags); if (fd >= 0) { data->dev = xstrdup (map[disk->id].device); data->access_mode = (flags & O_ACCMODE); data->fd = fd; } } #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) if (! (sysctl_oldflags & 0x10) && sysctlbyname ("kern.geom.debugflags", NULL , 0, &sysctl_oldflags, sysctl_size)) { grub_error (GRUB_ERR_BAD_DEVICE, "cannot set flags back to the old value for sysctl kern.geom.debugflags"); return -1; } #endif #if defined(__APPLE__) /* If we can't have exclusive access, try shared access */ if (fd < 0) fd = open(map[disk->id].device, flags | O_SHLOCK); #endif if (fd < 0) { grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot open `%s': %s"), map[disk->id].device, strerror (errno)); return -1; } #endif /* ! __linux__ */ #if defined(__NetBSD__) configure_device_driver (fd); #endif /* defined(__NetBSD__) */ if (grub_util_fd_seek (fd, map[disk->id].device, sector << disk->log_sector_size)) { close (fd); return -1; } return fd; } /* Read LEN bytes from FD in BUF. Return less than or equal to zero if an error occurs, otherwise return LEN. */ ssize_t grub_util_fd_read (int fd, char *buf, size_t len) { ssize_t size = len; while (len) { ssize_t ret = read (fd, buf, len); if (ret <= 0) { if (errno == EINTR) continue; else return ret; } len -= ret; buf += ret; } return size; } /* Write LEN bytes from BUF to FD. Return less than or equal to zero if an error occurs, otherwise return LEN. */ ssize_t grub_util_fd_write (int fd, const char *buf, size_t len) { ssize_t size = len; while (len) { ssize_t ret = write (fd, buf, len); if (ret <= 0) { if (errno == EINTR) continue; else return ret; } len -= ret; buf += ret; } return size; } static grub_err_t grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector, grub_size_t size, char *buf) { int fd; /* Split pre-partition and partition reads. */ if (disk->partition && sector < disk->partition->start && sector + size > disk->partition->start) { grub_err_t err; err = grub_util_biosdisk_read (disk, sector, disk->partition->start - sector, buf); if (err) return err; return grub_util_biosdisk_read (disk, disk->partition->start, size - (disk->partition->start - sector), buf + ((disk->partition->start - sector) << GRUB_DISK_SECTOR_BITS)); } fd = open_device (disk, sector, O_RDONLY); if (fd < 0) return grub_errno; #ifdef __linux__ if (sector == 0 && size > 1) { /* Work around a bug in Linux ez remapping. Linux remaps all sectors that are read together with the MBR in one read. It should only remap the MBR, so we split the read in two parts. -jochen */ if (grub_util_fd_read (fd, buf, (1 << disk->log_sector_size)) != (1 << disk->log_sector_size)) { grub_error (GRUB_ERR_READ_ERROR, N_("cannot read `%s': %s"), map[disk->id].device, strerror (errno)); return grub_errno; } buf += (1 << disk->log_sector_size); size--; } #endif /* __linux__ */ if (grub_util_fd_read (fd, buf, size << disk->log_sector_size) != (ssize_t) (size << disk->log_sector_size)) grub_error (GRUB_ERR_READ_ERROR, N_("cannot read `%s': %s"), map[disk->id].device, strerror (errno)); return grub_errno; } static grub_err_t grub_util_biosdisk_write (grub_disk_t disk, grub_disk_addr_t sector, grub_size_t size, const char *buf) { int fd; /* Split pre-partition and partition writes. */ if (disk->partition && sector < disk->partition->start && sector + size > disk->partition->start) { grub_err_t err; err = grub_util_biosdisk_write (disk, sector, disk->partition->start - sector, buf); if (err) return err; return grub_util_biosdisk_write (disk, disk->partition->start, size - (disk->partition->start - sector), buf + ((disk->partition->start - sector) << GRUB_DISK_SECTOR_BITS)); } fd = open_device (disk, sector, O_WRONLY); if (fd < 0) return grub_errno; if (grub_util_fd_write (fd, buf, size << disk->log_sector_size) != (ssize_t) (size << disk->log_sector_size)) grub_error (GRUB_ERR_WRITE_ERROR, N_("cannot write to `%s': %s"), map[disk->id].device, strerror (errno)); return grub_errno; } grub_err_t grub_util_biosdisk_flush (struct grub_disk *disk) { struct grub_util_biosdisk_data *data = disk->data; if (disk->dev->id != GRUB_DISK_DEVICE_BIOSDISK_ID) return GRUB_ERR_NONE; if (data->fd == -1) { data->fd = open_device (disk, 0, O_RDONLY); if (data->fd < 0) return grub_errno; } fsync (data->fd); #ifdef __linux__ if (data->is_disk) ioctl (data->fd, BLKFLSBUF, 0); #endif return GRUB_ERR_NONE; } static void grub_util_biosdisk_close (struct grub_disk *disk) { struct grub_util_biosdisk_data *data = disk->data; free (data->dev); if (data->fd != -1) { if (data->access_mode == O_RDWR || data->access_mode == O_WRONLY) grub_util_biosdisk_flush (disk); close (data->fd); } free (data); } static struct grub_disk_dev grub_util_biosdisk_dev = { .name = "hostdisk", .id = GRUB_DISK_DEVICE_HOSTDISK_ID, .iterate = grub_util_biosdisk_iterate, .open = grub_util_biosdisk_open, .close = grub_util_biosdisk_close, .read = grub_util_biosdisk_read, .write = grub_util_biosdisk_write, .next = 0 }; static void read_device_map (const char *dev_map) { FILE *fp; char buf[1024]; /* XXX */ int lineno = 0; struct stat st; auto void show_error (const char *msg) __attribute__ ((noreturn)); void __attribute__ ((noreturn)) show_error (const char *msg) { grub_util_error ("%s:%d: %s", dev_map, lineno, msg); } if (dev_map[0] == '\0') { grub_util_info ("no device.map"); return; } fp = fopen (dev_map, "r"); if (! fp) { grub_util_info (_("cannot open `%s': %s"), dev_map, strerror (errno)); return; } while (fgets (buf, sizeof (buf), fp)) { char *p = buf; char *e; int drive; lineno++; /* Skip leading spaces. */ while (*p && isspace (*p)) p++; /* If the first character is `#' or NUL, skip this line. */ if (*p == '\0' || *p == '#') continue; if (*p != '(') { char *tmp; tmp = xasprintf (_("missing `%c' symbol"), '('); show_error (tmp); } p++; /* Find a free slot. */ drive = find_free_slot (); if (drive < 0) show_error (_("device count exceeds limit")); e = p; p = strchr (p, ')'); if (! p) { char *tmp; tmp = xasprintf (_("missing `%c' symbol"), ')'); show_error (tmp); } map[drive].drive = xmalloc (p - e + sizeof ('\0')); strncpy (map[drive].drive, e, p - e + sizeof ('\0')); map[drive].drive[p - e] = '\0'; map[drive].device_map = 1; p++; /* Skip leading spaces. */ while (*p && isspace (*p)) p++; if (*p == '\0') show_error (_("filename expected")); /* NUL-terminate the filename. */ e = p; while (*e && ! isspace (*e)) e++; *e = '\0'; #ifdef __MINGW32__ (void) st; if (grub_util_get_disk_size (p) == -1LL) #else if (stat (p, &st) == -1) #endif { free (map[drive].drive); map[drive].drive = NULL; grub_util_info ("Cannot stat `%s', skipping", p); continue; } #ifdef __linux__ /* On Linux, the devfs uses symbolic links horribly, and that confuses the interface very much, so use realpath to expand symbolic links. Leave /dev/mapper/ alone, though. */ if (strncmp (p, "/dev/mapper/", 12) != 0) { map[drive].device = xmalloc (PATH_MAX); if (! realpath (p, map[drive].device)) grub_util_error (_("failed to get canonical path of %s"), p); } else #endif map[drive].device = xstrdup (p); } fclose (fp); } void grub_util_biosdisk_init (const char *dev_map) { read_device_map (dev_map); grub_disk_dev_register (&grub_util_biosdisk_dev); } void grub_util_biosdisk_fini (void) { unsigned i; for (i = 0; i < sizeof (map) / sizeof (map[0]); i++) { if (map[i].drive) free (map[i].drive); if (map[i].device) free (map[i].device); map[i].drive = map[i].device = NULL; } grub_disk_dev_unregister (&grub_util_biosdisk_dev); } const char * grub_util_biosdisk_get_compatibility_hint (grub_disk_t disk) { if (disk->dev != &grub_util_biosdisk_dev || map[disk->id].device_map) return disk->name; return 0; } const char * grub_util_biosdisk_get_osdev (grub_disk_t disk) { if (disk->dev != &grub_util_biosdisk_dev) return 0; return map[disk->id].device; }