/* deviceiter.c - iterate over system devices */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2011 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 #ifdef __linux__ # 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)) */ # 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 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 #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 # ifndef __FreeBSD_kernel_version # define __FreeBSD_kernel_version __FreeBSD_version # endif /* Runtime detection of kernel */ # include 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 /* ioctl */ # include # include /* CDIOCCLRDEBUG */ # if defined(__FreeBSD_kernel__) # include # if __FreeBSD_kernel_version >= 500040 # include # endif # endif /* __FreeBSD_kernel__ */ #endif /* __FreeBSD_kernel__ || __NetBSD__ || __OpenBSD__ */ #ifdef HAVE_OPENDISK # include #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 __FreeBSD_kernel__ static void get_ada_disk_name (char *name, int unit) { sprintf (name, "/dev/ada%d", unit); } static void get_ataraid_disk_name (char *name, int unit) { sprintf (name, "/dev/ar%d", unit); } static void get_mfi_disk_name (char *name, int unit) { sprintf (name, "/dev/mfid%d", unit); } #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; struct seen_device **prev; 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 __FreeBSD_kernel__ /* IDE disks using ATA Direct Access driver. */ if (get_kfreebsd_version () >= 800000) for (i = 0; i < 96; i++) { char name[16]; get_ada_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; } } /* LSI MegaRAID SAS. */ for (i = 0; i < 32; i++) { char name[20]; get_mfi_disk_name (name, i); if (check_device_readable_unique (name)) { if (hook (name, 0)) goto out; } } #endif #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/cdp. 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/cdp. */ { 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/cdp. */ { 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/cdp. */ { 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 */ { 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 (); }