[thirdparty/mdadm.git] / Build.c

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
 *
 *
 *    This program 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 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Neil Brown
 *    Email: <neilb@cse.unsw.edu.au>
 *    Paper: Neil Brown
 *           School of Computer Science and Engineering
 *           The University of New South Wales
 *           Sydney, 2052
 *           Australia
 */

#include "mdadm.h"

#define REGISTER_DEV 		_IO (MD_MAJOR, 1)
#define START_MD     		_IO (MD_MAJOR, 2)
#define STOP_MD      		_IO (MD_MAJOR, 3)

int Build(char *mddev, int chunk, int level, int layout,
	  int raiddisks, mddev_dev_t devlist, int assume_clean,
	  char *bitmap_file, int bitmap_chunk, int write_behind,
	  int delay, int verbose, int autof)
{
	/* Build a linear or raid0 arrays without superblocks
	 * We cannot really do any checks, we just do it.
	 * For md_version < 0.90.0, we call REGISTER_DEV
	 * with the device numbers, and then
	 * START_MD giving the "geometry"
	 * geometry is 0xpp00cc
	 * where pp is personality: 1==linear, 2=raid0
	 * cc = chunk size factor: 0==4k, 1==8k etc.
	 *
	 * For md_version >= 0.90.0 we call
	 * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
	 *
	 */
	int i;
	int vers;
	struct stat stb;
	int subdevs = 0, missing_disks = 0;
	mddev_dev_t dv;
	int bitmap_fd;
	unsigned long long size = ~0ULL;
	unsigned long long bitmapsize;
	int mdfd;

	/* scan all devices, make sure they really are block devices */
	for (dv = devlist; dv; dv=dv->next) {
		subdevs++;
		if (strcmp("missing", dv->devname) == 0) {
			missing_disks++;
			continue;
		}
		if (stat(dv->devname, &stb)) {
			fprintf(stderr, Name ": Cannot find %s: %s\n",
				dv->devname, strerror(errno));
			return 1;
		}
		if ((stb.st_mode & S_IFMT) != S_IFBLK) {
			fprintf(stderr, Name ": %s is not a block device.\n",
				dv->devname);
			return 1;
		}
	}

	if (raiddisks != subdevs) {
		fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
			raiddisks, subdevs);
		return 1;
	}

	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;
		}

	/* We need to create the device.  It can have no name. */
	mdfd = create_mddev(mddev, NULL, autof, LOCAL, NULL);
	if (mdfd < 0)
		return 1;

	vers = md_get_version(mdfd);

	/* looks Ok, go for it */
	if (vers >= 9000) {
		mdu_array_info_t array;
		array.level = level;
		array.size = 0;
		array.nr_disks = raiddisks;
		array.raid_disks = raiddisks;
		array.md_minor = 0;
		if (fstat(mdfd, &stb)==0)
			array.md_minor = minor(stb.st_rdev);
		array.not_persistent = 1;
		array.state = 0; /* not clean, but no errors */
		if (assume_clean)
			array.state |= 1;
		array.active_disks = raiddisks - missing_disks;
		array.working_disks = raiddisks - missing_disks;
		array.spare_disks = 0;
		array.failed_disks = missing_disks;
		if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
			chunk = 64;
		array.chunk_size = chunk*1024;
		array.layout = layout;
		if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
			fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
				mddev, strerror(errno));
			goto abort;
		}
	} else if (bitmap_file) {
		fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
		goto abort;
	}

	if (bitmap_file && level <= 0) {
		fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
			map_num(pers, level)?:"given");
		goto abort;
	}
	/* now add the devices */
	for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
		unsigned long long dsize;
		int fd;
		if (strcmp("missing", dv->devname) == 0)
			continue;
		if (stat(dv->devname, &stb)) {
			fprintf(stderr, Name ": Weird: %s has disappeared.\n",
				dv->devname);
			goto abort;
		}
		if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
			fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
				dv->devname);
			goto abort;
		}
		fd = open(dv->devname, O_RDONLY|O_EXCL);
		if (fd < 0) {
			fprintf(stderr, Name ": Cannot open %s: %s\n",
				dv->devname, strerror(errno));
			goto abort;
		}
		if (get_dev_size(fd, NULL, &dsize) &&
		    (size == 0 || dsize < size))
				size = dsize;
		close(fd);
		if (vers>= 9000) {
			mdu_disk_info_t disk;
			disk.number = i;
			disk.raid_disk = i;
			disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
			if (dv->writemostly == 1)
				disk.state |= 1<<MD_DISK_WRITEMOSTLY;
			disk.major = major(stb.st_rdev);
			disk.minor = minor(stb.st_rdev);
			if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
				fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
					dv->devname, strerror(errno));
				goto abort;
			}
		} else {
			if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
				fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
					dv->devname, strerror(errno));
				goto abort;
			}
		}
	}
	/* now to start it */
	if (vers >= 9000) {
		mdu_param_t param; /* not used by syscall */
		if (bitmap_file) {
			bitmap_fd = open(bitmap_file, O_RDWR);
			if (bitmap_fd < 0) {
				int major = BITMAP_MAJOR_HI;
#if 0
				if (bitmap_chunk == UnSet) {
					fprintf(stderr, Name ": %s cannot be openned.",
						bitmap_file);
					goto abort;
				}
#endif
				if (vers < 9003) {
					major = BITMAP_MAJOR_HOSTENDIAN;
#ifdef __BIG_ENDIAN
					fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
						"  between different architectures.  Consider upgrading the Linux kernel.\n");
#endif
				}
				bitmapsize = size>>9; /* FIXME wrong for RAID10 */
				if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
						 delay, write_behind, bitmapsize, major)) {
					goto abort;
				}
				bitmap_fd = open(bitmap_file, O_RDWR);
				if (bitmap_fd < 0) {
					fprintf(stderr, Name ": %s cannot be openned.",
						bitmap_file);
					goto abort;
				}
			}
			if (bitmap_fd >= 0) {
				if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
					fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
						mddev, strerror(errno));
					goto abort;
				}
			}
		}
		if (ioctl(mdfd, RUN_ARRAY, &param)) {
			fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
				strerror(errno));
			goto abort;
		}
	} else {
		unsigned long arg;
		arg=0;
		while (chunk > 4096) {
			arg++;
			chunk >>= 1;
		}
		if (level == 0)
			chunk |= 0x20000;
		else 	chunk |= 0x10000;
		if (ioctl(mdfd, START_MD, arg)) {
			fprintf(stderr, Name ": START_MD failed: %s\n",
				strerror(errno));
			goto abort;
		}
	}
	if (verbose >= 0)
		fprintf(stderr, Name ": array %s built and started.\n",
			mddev);
	close(mdfd);
	return 0;

 abort:
	if (vers >= 9000)
	    ioctl(mdfd, STOP_ARRAY, 0);
	else
	    ioctl(mdfd, STOP_MD, 0);
	close(mdfd);
	return 1;
}
Commit	Line	Data
64c4757e	1	/*
9a9dab36	2	* mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e	3	*
4f589ad0	4	* Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
64c4757e NB	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Author: Neil Brown
	22	* Email: <neilb@cse.unsw.edu.au>
	23	* Paper: Neil Brown
	24	* School of Computer Science and Engineering
	25	* The University of New South Wales
	26	* Sydney, 2052
	27	* Australia
	28	*/
	29
9a9dab36	30	#include "mdadm.h"
64c4757e	31
82b27616 NB	32	#define REGISTER_DEV _IO (MD_MAJOR, 1)
	33	#define START_MD _IO (MD_MAJOR, 2)
	34	#define STOP_MD _IO (MD_MAJOR, 3)
	35
7f91af49 N	36	int Build(char *mddev, int chunk, int level, int layout,
	37	int raiddisks, mddev_dev_t devlist, int assume_clean,
	38	char *bitmap_file, int bitmap_chunk, int write_behind,
	39	int delay, int verbose, int autof)
64c4757e	40	{
82b27616 NB	41	/* Build a linear or raid0 arrays without superblocks
	42	* We cannot really do any checks, we just do it.
	43	* For md_version < 0.90.0, we call REGISTER_DEV
	44	* with the device numbers, and then
	45	* START_MD giving the "geometry"
	46	* geometry is 0xpp00cc
	47	* where pp is personality: 1==linear, 2=raid0
	48	* cc = chunk size factor: 0==4k, 1==8k etc.
	49	*
	50	* For md_version >= 0.90.0 we call
	51	* SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY
	52	*
	53	*/
	54	int i;
	55	int vers;
	56	struct stat stb;
98ce3849	57	int subdevs = 0, missing_disks = 0;
cd29a5c8	58	mddev_dev_t dv;
c82f047c	59	int bitmap_fd;
fe80f49b	60	unsigned long long size = ~0ULL;
f9c25f1d	61	unsigned long long bitmapsize;
7f91af49	62	int mdfd;
82b27616 NB	63
82b27616 NB	64	/* scan all devices, make sure they really are block devices */
cd29a5c8	65	for (dv = devlist; dv; dv=dv->next) {
98ce3849 NB	66	subdevs++;
	67	if (strcmp("missing", dv->devname) == 0) {
	68	missing_disks++;
	69	continue;
	70	}
cd29a5c8	71	if (stat(dv->devname, &stb)) {
82b27616	72	fprintf(stderr, Name ": Cannot find %s: %s\n",
cd29a5c8	73	dv->devname, strerror(errno));
82b27616 NB	74	return 1;
	75	}
	76	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
	77	fprintf(stderr, Name ": %s is not a block device.\n",
cd29a5c8	78	dv->devname);
82b27616 NB	79	return 1;
82b27616 NB	80	}
cd29a5c8 NB	81	}
	82
	83	if (raiddisks != subdevs) {
	84	fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
	85	raiddisks, subdevs);
	86	return 1;
82b27616 NB	87	}
82b27616 NB	88
b5e64645 NB	89	if (layout == UnSet)
	90	switch(level) {
	91	default: /* no layout */
	92	layout = 0;
	93	break;
	94	case 10:
	95	layout = 0x102; /* near=2, far=1 */
dab6685f	96	if (verbose > 0)
b5e64645 NB	97	fprintf(stderr,
	98	Name ": layout defaults to n1\n");
	99	break;
	100	case 5:
	101	case 6:
	102	layout = map_name(r5layout, "default");
dab6685f	103	if (verbose > 0)
b5e64645 NB	104	fprintf(stderr,
	105	Name ": layout defaults to %s\n", map_num(r5layout, layout));
	106	break;
	107	case LEVEL_FAULTY:
	108	layout = map_name(faultylayout, "default");
	109
dab6685f	110	if (verbose > 0)
b5e64645 NB	111	fprintf(stderr,
	112	Name ": layout defaults to %s\n", map_num(faultylayout, layout));
	113	break;
	114	}
	115
69207ff6 N	116	/* We need to create the device. It can have no name. */
69207ff6 N	117	mdfd = create_mddev(mddev, NULL, autof, LOCAL, NULL);
7f91af49 N	118	if (mdfd < 0)
7f91af49 N	119	return 1;
b5e64645	120
82b27616	121	vers = md_get_version(mdfd);
aba69144	122
82b27616	123	/* looks Ok, go for it */
cd29a5c8	124	if (vers >= 9000) {
82b27616 NB	125	mdu_array_info_t array;
	126	array.level = level;
	127	array.size = 0;
	128	array.nr_disks = raiddisks;
	129	array.raid_disks = raiddisks;
	130	array.md_minor = 0;
	131	if (fstat(mdfd, &stb)==0)
0df46c2a	132	array.md_minor = minor(stb.st_rdev);
cd29a5c8	133	array.not_persistent = 1;
82b27616	134	array.state = 0; /* not clean, but no errors */
dd0781e5 NB	135	if (assume_clean)
dd0781e5 NB	136	array.state \|= 1;
98ce3849 NB	137	array.active_disks = raiddisks - missing_disks;
98ce3849 NB	138	array.working_disks = raiddisks - missing_disks;
82b27616	139	array.spare_disks = 0;
98ce3849	140	array.failed_disks = missing_disks;
699f9899	141	if (chunk == 0 && (level==0 \|\| level==LEVEL_LINEAR))
cd29a5c8	142	chunk = 64;
82b27616	143	array.chunk_size = chunk*1024;
b5e64645	144	array.layout = layout;
82b27616 NB	145	if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
	146	fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
	147	mddev, strerror(errno));
7f91af49	148	goto abort;
82b27616	149	}
c82f047c NB	150	} else if (bitmap_file) {
c82f047c NB	151	fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
7f91af49	152	goto abort;
82b27616	153	}
5b28bd56 NB	154
	155	if (bitmap_file && level <= 0) {
	156	fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
	157	map_num(pers, level)?:"given");
7f91af49	158	goto abort;
5b28bd56	159	}
82b27616	160	/* now add the devices */
cd29a5c8	161	for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
beae1dfe	162	unsigned long long dsize;
fe80f49b	163	int fd;
98ce3849 NB	164	if (strcmp("missing", dv->devname) == 0)
98ce3849 NB	165	continue;
cd29a5c8	166	if (stat(dv->devname, &stb)) {
98ce3849	167	fprintf(stderr, Name ": Weird: %s has disappeared.\n",
cd29a5c8	168	dv->devname);
82b27616 NB	169	goto abort;
82b27616 NB	170	}
cd29a5c8	171	if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
82b27616	172	fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
cd29a5c8	173	dv->devname);
82b27616 NB	174	goto abort;
82b27616 NB	175	}
fe80f49b NB	176	fd = open(dv->devname, O_RDONLY\|O_EXCL);
fe80f49b NB	177	if (fd < 0) {
aba69144	178	fprintf(stderr, Name ": Cannot open %s: %s\n",
fe80f49b NB	179	dv->devname, strerror(errno));
	180	goto abort;
	181	}
beae1dfe NB	182	if (get_dev_size(fd, NULL, &dsize) &&
	183	(size == 0 \|\| dsize < size))
	184	size = dsize;
fe80f49b	185	close(fd);
cd29a5c8	186	if (vers>= 9000) {
82b27616 NB	187	mdu_disk_info_t disk;
	188	disk.number = i;
	189	disk.raid_disk = i;
dfd4d8ee	190	disk.state = (1<<MD_DISK_SYNC) \| (1<<MD_DISK_ACTIVE);
b3d31955	191	if (dv->writemostly == 1)
dfd4d8ee	192	disk.state \|= 1<<MD_DISK_WRITEMOSTLY;
0df46c2a NB	193	disk.major = major(stb.st_rdev);
0df46c2a NB	194	disk.minor = minor(stb.st_rdev);
82b27616 NB	195	if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
82b27616 NB	196	fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
cd29a5c8	197	dv->devname, strerror(errno));
82b27616 NB	198	goto abort;
	199	}
	200	} else {
	201	if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
e0d19036	202	fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
cd29a5c8	203	dv->devname, strerror(errno));
82b27616 NB	204	goto abort;
	205	}
	206	}
	207	}
	208	/* now to start it */
cd29a5c8	209	if (vers >= 9000) {
82b27616	210	mdu_param_t param; /* not used by syscall */
c82f047c NB	211	if (bitmap_file) {
	212	bitmap_fd = open(bitmap_file, O_RDWR);
	213	if (bitmap_fd < 0) {
dcec9ee5	214	int major = BITMAP_MAJOR_HI;
1bfdbe01	215	#if 0
c82f047c NB	216	if (bitmap_chunk == UnSet) {
	217	fprintf(stderr, Name ": %s cannot be openned.",
	218	bitmap_file);
7f91af49	219	goto abort;
c82f047c	220	}
1bfdbe01	221	#endif
dcec9ee5 NB	222	if (vers < 9003) {
	223	major = BITMAP_MAJOR_HOSTENDIAN;
	224	#ifdef __BIG_ENDIAN
	225	fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
1bfdbe01	226	" between different architectures. Consider upgrading the Linux kernel.\n");
dcec9ee5 NB	227	#endif
dcec9ee5 NB	228	}
f9c25f1d	229	bitmapsize = size>>9; /* FIXME wrong for RAID10 */
c82f047c	230	if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
f9c25f1d	231	delay, write_behind, bitmapsize, major)) {
7f91af49	232	goto abort;
c82f047c NB	233	}
	234	bitmap_fd = open(bitmap_file, O_RDWR);
	235	if (bitmap_fd < 0) {
	236	fprintf(stderr, Name ": %s cannot be openned.",
	237	bitmap_file);
7f91af49	238	goto abort;
c82f047c	239	}
aba69144	240	}
c82f047c NB	241	if (bitmap_fd >= 0) {
	242	if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
	243	fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
	244	mddev, strerror(errno));
7f91af49	245	goto abort;
c82f047c NB	246	}
	247	}
	248	}
cd29a5c8	249	if (ioctl(mdfd, RUN_ARRAY, &param)) {
82b27616 NB	250	fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
	251	strerror(errno));
	252	goto abort;
	253	}
	254	} else {
cd29a5c8	255	unsigned long arg;
82b27616 NB	256	arg=0;
	257	while (chunk > 4096) {
	258	arg++;
	259	chunk >>= 1;
	260	}
	261	if (level == 0)
	262	chunk \|= 0x20000;
	263	else chunk \|= 0x10000;
	264	if (ioctl(mdfd, START_MD, arg)) {
	265	fprintf(stderr, Name ": START_MD failed: %s\n",
	266	strerror(errno));
	267	goto abort;
	268	}
	269	}
dab6685f NB	270	if (verbose >= 0)
	271	fprintf(stderr, Name ": array %s built and started.\n",
	272	mddev);
7f91af49	273	close(mdfd);
82b27616 NB	274	return 0;
	275
	276	abort:
cd29a5c8	277	if (vers >= 9000)
82b27616 NB	278	ioctl(mdfd, STOP_ARRAY, 0);
	279	else
	280	ioctl(mdfd, STOP_MD, 0);
7f91af49	281	close(mdfd);
82b27616	282	return 1;
64c4757e	283	}