/*
- * mdctl - manage Linux "md" devices aka RAID arrays.
+ * mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2001 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* Australia
*/
-#include "mdctl.h"
+#include "mdadm.h"
+#include "md_u.h"
+#include "md_p.h"
+#include <ctype.h>
-int Create(char *mddev, int mdfd,
- int chunk, int level, int layout, int raiddisks, int sparedisks,
- int subdevs, char *subdev[],
- int runstop)
+int Create(struct supertype *st, char *mddev, int mdfd,
+ int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
+ char *name, char *homehost, int *uuid,
+ int subdevs, mddev_dev_t devlist,
+ int runstop, int verbose, int force, int assume_clean,
+ char *bitmap_file, int bitmap_chunk, int write_behind, int delay)
{
+ /*
+ * Create a new raid array.
+ *
+ * First check that necessary details are available
+ * (i.e. level, raid-disks)
+ *
+ * Then check each disk to see what might be on it
+ * and report anything interesting.
+ *
+ * If anything looks odd, and runstop not set,
+ * abort.
+ *
+ * SET_ARRAY_INFO and ADD_NEW_DISK, and
+ * if runstop==run, or raiddisks disks were used,
+ * RUN_ARRAY
+ */
+ unsigned long long minsize=0, maxsize=0;
+ char *mindisc = NULL;
+ char *maxdisc = NULL;
+ int dnum;
+ mddev_dev_t dv;
+ int fail=0, warn=0;
+ struct stat stb;
+ int first_missing = subdevs * 2;
+ int second_missing = subdevs * 2;
+ int missing_disks = 0;
+ int insert_point = subdevs * 2; /* where to insert a missing drive */
+ int pass;
+ int vers;
+ int rv;
+ int bitmap_fd;
+ unsigned long long bitmapsize;
+ struct mdinfo info;
+
+ int major_num = BITMAP_MAJOR_HI;
+
+ memset(&info, 0, sizeof(info));
+
+ vers = md_get_version(mdfd);
+ if (vers < 9000) {
+ fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
+ return 1;
+ } else {
+ mdu_array_info_t inf;
+ memset(&inf, 0, sizeof(inf));
+ ioctl(mdfd, GET_ARRAY_INFO, &inf);
+ if (inf.working_disks != 0) {
+ fprintf(stderr, Name ": another array by this name"
+ " is already running.\n");
+ return 1;
+ }
+ }
+ if (level == UnSet) {
+ fprintf(stderr,
+ Name ": a RAID level is needed to create an array.\n");
+ return 1;
+ }
+ if (raiddisks < 4 && level == 6) {
+ fprintf(stderr,
+ Name ": at least 4 raid-devices needed for level 6\n");
+ return 1;
+ }
+ if (raiddisks > 256 && level == 6) {
+ fprintf(stderr,
+ Name ": no more than 256 raid-devices supported for level 6\n");
+ return 1;
+ }
+ if (raiddisks < 2 && level >= 4) {
+ fprintf(stderr,
+ Name ": at least 2 raid-devices needed for level 4 or 5\n");
+ return 1;
+ }
+ if (level <= 0 && sparedisks) {
+ fprintf(stderr,
+ Name ": This level does not support spare devices\n");
+ return 1;
+ }
+ if (subdevs > raiddisks+sparedisks) {
+ fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
+ return 1;
+ }
+ if (subdevs < raiddisks+sparedisks) {
+ fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
+ return 1;
+ }
+ if (bitmap_file && level <= 0) {
+ fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
+ map_num(pers, level)?:"given");
+ return 1;
+ }
+
+ /* now set some defaults */
+ if (layout == UnSet)
+ switch(level) {
+ default: /* no layout */
+ layout = 0;
+ break;
+ case 10:
+ layout = 0x102; /* near=2, far=1 */
+ if (verbose > 0)
+ fprintf(stderr,
+ Name ": layout defaults to n1\n");
+ break;
+ case 5:
+ case 6:
+ layout = map_name(r5layout, "default");
+ if (verbose > 0)
+ fprintf(stderr,
+ Name ": layout defaults to %s\n", map_num(r5layout, layout));
+ break;
+ case LEVEL_FAULTY:
+ layout = map_name(faultylayout, "default");
+
+ if (verbose > 0)
+ fprintf(stderr,
+ Name ": layout defaults to %s\n", map_num(faultylayout, layout));
+ break;
+ }
+
+ if (level == 10)
+ /* check layout fits in array*/
+ if ((layout&255) * ((layout>>8)&255) > raiddisks) {
+ fprintf(stderr, Name ": that layout requires at least %d devices\n",
+ (layout&255) * ((layout>>8)&255));
+ return 1;
+ }
+
+ switch(level) {
+ case 4:
+ case 5:
+ case 10:
+ case 6:
+ case 0:
+ case LEVEL_LINEAR: /* linear */
+ if (chunk == 0) {
+ chunk = 64;
+ if (verbose > 0)
+ fprintf(stderr, Name ": chunk size defaults to 64K\n");
+ }
+ break;
+ case 1:
+ case LEVEL_FAULTY:
+ case LEVEL_MULTIPATH:
+ case LEVEL_CONTAINER:
+ if (chunk) {
+ chunk = 0;
+ if (verbose > 0)
+ fprintf(stderr, Name ": chunk size ignored for this level\n");
+ }
+ break;
+ default:
+ fprintf(stderr, Name ": unknown level %d\n", level);
+ return 1;
+ }
+
+ if (st && ! st->ss->validate_geometry(st, level, layout, raiddisks,
+ chunk, size, NULL, NULL))
+ return 1;
+
+ /* now look at the subdevs */
+ info.array.active_disks = 0;
+ info.array.working_disks = 0;
+ dnum = 0;
+ for (dv=devlist; dv; dv=dv->next, dnum++) {
+ char *dname = dv->devname;
+ unsigned long long freesize;
+ if (strcasecmp(dname, "missing")==0) {
+ if (first_missing > dnum)
+ first_missing = dnum;
+ if (second_missing > dnum && dnum > first_missing)
+ second_missing = dnum;
+ missing_disks ++;
+ continue;
+ }
+ info.array.working_disks++;
+ if (dnum < raiddisks)
+ info.array.active_disks++;
+ if (st == NULL) {
+ struct createinfo *ci = conf_get_create_info();
+ if (ci)
+ st = ci->supertype;
+ }
+ if (st == NULL) {
+ /* Need to choose a default metadata, which is different
+ * depending on geometry of array.
+ */
+ int i;
+ char *name = "default";
+ for(i=0; !st && superlist[i]; i++) {
+ st = superlist[i]->match_metadata_desc(name);
+ if (st && !st->ss->validate_geometry
+ (st, level, layout, raiddisks,
+ chunk, size, dname, &freesize))
+ st = NULL;
+ }
+
+ if (!st) {
+ fprintf(stderr, Name ": device %s not suitable "
+ "for any style of array\n",
+ dname);
+ exit(2);
+ }
+ if (st->ss->major != 0 ||
+ st->minor_version != 90)
+ fprintf(stderr, Name ": Defaulting to version"
+ " %d.%d metadata\n",
+ st->ss->major,
+ st->minor_version);
+ } else {
+ if (!st->ss->validate_geometry(st, level, layout,
+ raiddisks,
+ chunk, size, dname,
+ &freesize)) {
+
+ fprintf(stderr,
+ Name ": %s is not suitable for "
+ "this array.\n",
+ dname);
+ fail = 1;
+ continue;
+ }
+ }
+
+ freesize /= 2; /* convert to K */
+ if (chunk) {
+ /* round to chunk size */
+ freesize = freesize & ~(chunk-1);
+ }
+
+ if (size && freesize < size) {
+ fprintf(stderr, Name ": %s is smaller that given size."
+ " %lluK < %lluK + metadata\n",
+ dname, freesize, size);
+ fail = 1;
+ continue;
+ }
+ if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
+ maxdisc = dname;
+ maxsize = freesize;
+ }
+ if (mindisc ==NULL || (mindisc && freesize < minsize)) {
+ mindisc = dname;
+ minsize = freesize;
+ }
+ if (runstop != 1 || verbose >= 0) {
+ int fd = open(dname, O_RDONLY, 0);
+ if (fd <0 ) {
+ fprintf(stderr, Name ": Cannot open %s: %s\n",
+ dname, strerror(errno));
+ fail=1;
+ continue;
+ }
+ warn |= check_ext2(fd, dname);
+ warn |= check_reiser(fd, dname);
+ warn |= check_raid(fd, dname);
+ close(fd);
+ }
+ }
+ if (fail) {
+ fprintf(stderr, Name ": create aborted\n");
+ return 1;
+ }
+ if (size == 0) {
+ if (mindisc == NULL) {
+ fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
+ return 1;
+ }
+ if (level > 0 || level == LEVEL_MULTIPATH || level == LEVEL_FAULTY) {
+ /* size is meaningful */
+ if (minsize > 0x100000000ULL && st->ss->major == 0) {
+ fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
+ return 1;
+ }
+ size = minsize;
+ if (verbose > 0)
+ fprintf(stderr, Name ": size set to %lluK\n", size);
+ }
+ }
+ if (level > 0 && ((maxsize-size)*100 > maxsize)) {
+ if (runstop != 1 || verbose >= 0)
+ fprintf(stderr, Name ": largest drive (%s) exceed size (%lluK) by more than 1%%\n",
+ maxdisc, size);
+ warn = 1;
+ }
+
+ if (warn) {
+ if (runstop!= 1) {
+ if (!ask("Continue creating array? ")) {
+ fprintf(stderr, Name ": create aborted.\n");
+ return 1;
+ }
+ } else {
+ if (verbose > 0)
+ fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
+ }
+ }
+
+ /* If this is raid4/5, we want to configure the last active slot
+ * as missing, so that a reconstruct happens (faster than re-parity)
+ * FIX: Can we do this for raid6 as well?
+ */
+ if (assume_clean==0 && force == 0 && first_missing >= raiddisks) {
+ switch ( level ) {
+ case 4:
+ case 5:
+ insert_point = raiddisks-1;
+ sparedisks++;
+ info.array.active_disks--;
+ missing_disks++;
+ break;
+ default:
+ break;
+ }
+ }
+ /* For raid6, if creating with 1 missing drive, make a good drive
+ * into a spare, else the create will fail
+ */
+ if (assume_clean == 0 && force == 0 && first_missing < raiddisks &&
+ second_missing >= raiddisks && level == 6) {
+ insert_point = raiddisks - 1;
+ if (insert_point == first_missing)
+ insert_point--;
+ sparedisks ++;
+ info.array.active_disks--;
+ missing_disks++;
+ }
+
+ if (level <= 0 && first_missing != subdevs * 2) {
+ fprintf(stderr,
+ Name ": This level does not support missing devices\n");
+ return 1;
+ }
+
+ /* Ok, lets try some ioctls */
+
+ info.array.level = level;
+ info.array.size = size;
+ info.array.raid_disks = raiddisks;
+ /* The kernel should *know* what md_minor we are dealing
+ * with, but it chooses to trust me instead. Sigh
+ */
+ info.array.md_minor = 0;
+ if (fstat(mdfd, &stb)==0)
+ info.array.md_minor = minor(stb.st_rdev);
+ info.array.not_persistent = 0;
+
+ if ( ( (level == 4 || level == 5) &&
+ (insert_point < raiddisks || first_missing < raiddisks) )
+ ||
+ ( level == 6 && (insert_point < raiddisks
+ || second_missing < raiddisks))
+ ||
+ assume_clean
+ )
+ info.array.state = 1; /* clean, but one+ drive will be missing*/
+ else
+ info.array.state = 0; /* not clean, but no errors */
+
+ if (level == 10) {
+ /* for raid10, the bitmap size is the capacity of the array,
+ * which is array.size * raid_disks / ncopies;
+ * .. but convert to sectors.
+ */
+ int ncopies = ((layout>>8) & 255) * (layout & 255);
+ bitmapsize = (unsigned long long)size * raiddisks / ncopies * 2;
+/* printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, size, raiddisks, ncopies);*/
+ } else
+ bitmapsize = (unsigned long long)size * 2;
+
+ /* There is lots of redundancy in these disk counts,
+ * raid_disks is the most meaningful value
+ * it describes the geometry of the array
+ * it is constant
+ * nr_disks is total number of used slots.
+ * it should be raid_disks+spare_disks
+ * spare_disks is the number of extra disks present
+ * see above
+ * active_disks is the number of working disks in
+ * active slots. (With raid_disks)
+ * working_disks is the total number of working disks,
+ * including spares
+ * failed_disks is the number of disks marked failed
+ *
+ * Ideally, the kernel would keep these (except raid_disks)
+ * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
+ * So for now, we assume that all raid and spare
+ * devices will be given.
+ */
+ info.array.spare_disks=sparedisks;
+ info.array.failed_disks=missing_disks;
+ info.array.nr_disks = info.array.working_disks
+ + info.array.failed_disks;
+ info.array.layout = layout;
+ info.array.chunk_size = chunk*1024;
+ info.array.major_version = st->ss->major;
+
+ if (name == NULL || *name == 0) {
+ /* base name on mddev */
+ /* /dev/md0 -> 0
+ * /dev/md_d0 -> d0
+ * /dev/md/1 -> 1
+ * /dev/md/d1 -> d1
+ * /dev/md/home -> home
+ * /dev/mdhome -> home
+ */
+ name = strrchr(mddev, '/');
+ if (name) {
+ name++;
+ if (strncmp(name, "md_d", 4)==0 &&
+ strlen(name) > 4 &&
+ isdigit(name[4]) &&
+ (name-mddev) == 5 /* /dev/ */)
+ name += 3;
+ else if (strncmp(name, "md", 2)==0 &&
+ strlen(name) > 2 &&
+ isdigit(name[2]) &&
+ (name-mddev) == 5 /* /dev/ */)
+ name += 2;
+ }
+ }
+ if (!st->ss->init_super(st, &info.array, size, name, homehost, uuid))
+ return 1;
+
+ if (bitmap_file && vers < 9003) {
+ major_num = BITMAP_MAJOR_HOSTENDIAN;
+#ifdef __BIG_ENDIAN
+ fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
+ " between different architectured. Consider upgrading the Linux kernel.\n");
+#endif
+ }
+
+ if (bitmap_file && strcmp(bitmap_file, "internal")==0) {
+ if ((vers%100) < 2) {
+ fprintf(stderr, Name ": internal bitmaps not supported by this kernel.\n");
+ return 1;
+ }
+ if (!st->ss->add_internal_bitmap(st, &bitmap_chunk,
+ delay, write_behind,
+ bitmapsize, 1, major_num)) {
+ fprintf(stderr, Name ": Given bitmap chunk size not supported.\n");
+ return 1;
+ }
+ bitmap_file = NULL;
+ }
+
+
+
+ if ((vers % 100) >= 1) { /* can use different versions */
+ mdu_array_info_t inf;
+ memset(&inf, 0, sizeof(inf));
+ inf.major_version = st->ss->major;
+ inf.minor_version = st->minor_version;
+ rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
+ } else
+ rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
+ if (rv) {
+ fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
+ mddev, strerror(errno));
+ return 1;
+ }
+
+ if (bitmap_file) {
+ int uuid[4];
+
+ st->ss->uuid_from_super(st, uuid);
+ if (CreateBitmap(bitmap_file, force, (char*)uuid, bitmap_chunk,
+ delay, write_behind,
+ bitmapsize,
+ major_num)) {
+ return 1;
+ }
+ bitmap_fd = open(bitmap_file, O_RDWR);
+ if (bitmap_fd < 0) {
+ fprintf(stderr, Name ": weird: %s cannot be openned\n",
+ bitmap_file);
+ return 1;
+ }
+ if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
+ fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
+ mddev, strerror(errno));
+ return 1;
+ }
+ }
+
+
+
+ for (pass=1; pass <=2 ; pass++) {
+ mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
+
+ for (dnum=0, dv = devlist ; dv ;
+ dv=(dv->next)?(dv->next):moved_disk, dnum++) {
+ int fd;
+ struct stat stb;
+
+ info.disk.number = dnum;
+ if (dnum == insert_point) {
+ moved_disk = dv;
+ }
+ info.disk.raid_disk = info.disk.number;
+ if (info.disk.raid_disk < raiddisks)
+ info.disk.state = (1<<MD_DISK_ACTIVE) |
+ (1<<MD_DISK_SYNC);
+ else
+ info.disk.state = 0;
+ if (dv->writemostly)
+ info.disk.state |= (1<<MD_DISK_WRITEMOSTLY);
+
+ if (dnum == insert_point ||
+ strcasecmp(dv->devname, "missing")==0)
+ continue;
+
+ fd = open(dv->devname, O_RDWR|O_EXCL, 0);
+ if (fd < 0) {
+ fprintf(stderr, Name ": failed to open %s "
+ "after earlier success - aborting\n",
+ dv->devname);
+ return 1;
+ }
+ fstat(fd, &stb);
+ info.disk.major = major(stb.st_rdev);
+ info.disk.minor = minor(stb.st_rdev);
+
+ switch(pass){
+ case 1:
+ remove_partitions(fd);
+ st->ss->add_to_super(st, &info.disk,
+ fd, dv->devname);
+ break;
+ case 2:
+ close(fd);
+
+ if (ioctl(mdfd, ADD_NEW_DISK, &info.disk)) {
+ fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
+ dv->devname, strerror(errno));
+ st->ss->free_super(st);
+ return 1;
+ }
+
+ break;
+ }
+ if (dv == moved_disk && dnum != insert_point) break;
+ }
+ if (pass == 1)
+ st->ss->write_init_super(st);
+ }
+ st->ss->free_super(st);
+
+ /* param is not actually used */
+ if (level == LEVEL_CONTAINER)
+ /* No need to start */
+ ;
+ else if (runstop == 1 || subdevs >= raiddisks) {
+ mdu_param_t param;
+ if (ioctl(mdfd, RUN_ARRAY, ¶m)) {
+ fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
+ strerror(errno));
+ Manage_runstop(mddev, mdfd, -1, 0);
+ return 1;
+ }
+ if (verbose >= 0)
+ fprintf(stderr, Name ": array %s started.\n", mddev);
+ } else {
+ fprintf(stderr, Name ": not starting array - not enough devices.\n");
+ }
+ return 0;
}
projects / thirdparty / mdadm.git / blobdiff