[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 mdfd, 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)
{
	/* 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;

	/* 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;
		}


	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));
			return 1;
		}
	} else if (bitmap_file) {
		fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
		return 1;
	}
	/* now add the devices */
	for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
		unsigned 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 (ioctl(fd, BLKGETSIZE, &dsize) == 0 && dsize > 0) {
			unsigned long long ldsize = dsize;
			ldsize <<= 9;
			if (size== 0 || ldsize < size)
				size = ldsize;
		}
		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)
				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);
					return 1;
				}
#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)) {
					return 1;
				}
				bitmap_fd = open(bitmap_file, O_RDWR);
				if (bitmap_fd < 0) {
					fprintf(stderr, Name ": %s cannot be openned.",
						bitmap_file);
					return 1;
				}
			}				
			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));
					return 1;
				}
			}
		}
		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);
	return 0;

 abort:
	if (vers >= 9000)
	    ioctl(mdfd, STOP_ARRAY, 0);
	else
	    ioctl(mdfd, STOP_MD, 0);
	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
b5e64645	36	int Build(char *mddev, int mdfd, int chunk, int level, int layout,
64c4757e	37	int raiddisks,
c82f047c	38	mddev_dev_t devlist, int assume_clean,
dab6685f	39	char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose)
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;
82b27616 NB	62
82b27616 NB	63	/* scan all devices, make sure they really are block devices */
cd29a5c8	64	for (dv = devlist; dv; dv=dv->next) {
98ce3849 NB	65	subdevs++;
	66	if (strcmp("missing", dv->devname) == 0) {
	67	missing_disks++;
	68	continue;
	69	}
cd29a5c8	70	if (stat(dv->devname, &stb)) {
82b27616	71	fprintf(stderr, Name ": Cannot find %s: %s\n",
cd29a5c8	72	dv->devname, strerror(errno));
82b27616 NB	73	return 1;
	74	}
	75	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
	76	fprintf(stderr, Name ": %s is not a block device.\n",
cd29a5c8	77	dv->devname);
82b27616 NB	78	return 1;
82b27616 NB	79	}
cd29a5c8 NB	80	}
	81
	82	if (raiddisks != subdevs) {
	83	fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
	84	raiddisks, subdevs);
	85	return 1;
82b27616 NB	86	}
82b27616 NB	87
b5e64645 NB	88	if (layout == UnSet)
	89	switch(level) {
	90	default: /* no layout */
	91	layout = 0;
	92	break;
	93	case 10:
	94	layout = 0x102; /* near=2, far=1 */
dab6685f	95	if (verbose > 0)
b5e64645 NB	96	fprintf(stderr,
	97	Name ": layout defaults to n1\n");
	98	break;
	99	case 5:
	100	case 6:
	101	layout = map_name(r5layout, "default");
dab6685f	102	if (verbose > 0)
b5e64645 NB	103	fprintf(stderr,
	104	Name ": layout defaults to %s\n", map_num(r5layout, layout));
	105	break;
	106	case LEVEL_FAULTY:
	107	layout = map_name(faultylayout, "default");
	108
dab6685f	109	if (verbose > 0)
b5e64645 NB	110	fprintf(stderr,
	111	Name ": layout defaults to %s\n", map_num(faultylayout, layout));
	112	break;
	113	}
	114
	115
82b27616 NB	116	vers = md_get_version(mdfd);
	117
	118	/* looks Ok, go for it */
cd29a5c8	119	if (vers >= 9000) {
82b27616 NB	120	mdu_array_info_t array;
	121	array.level = level;
	122	array.size = 0;
	123	array.nr_disks = raiddisks;
	124	array.raid_disks = raiddisks;
	125	array.md_minor = 0;
	126	if (fstat(mdfd, &stb)==0)
0df46c2a	127	array.md_minor = minor(stb.st_rdev);
cd29a5c8	128	array.not_persistent = 1;
82b27616	129	array.state = 0; /* not clean, but no errors */
dd0781e5 NB	130	if (assume_clean)
dd0781e5 NB	131	array.state \|= 1;
98ce3849 NB	132	array.active_disks = raiddisks - missing_disks;
98ce3849 NB	133	array.working_disks = raiddisks - missing_disks;
82b27616	134	array.spare_disks = 0;
98ce3849	135	array.failed_disks = missing_disks;
699f9899	136	if (chunk == 0 && (level==0 \|\| level==LEVEL_LINEAR))
cd29a5c8	137	chunk = 64;
82b27616	138	array.chunk_size = chunk*1024;
b5e64645	139	array.layout = layout;
82b27616 NB	140	if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
	141	fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
	142	mddev, strerror(errno));
	143	return 1;
	144	}
c82f047c NB	145	} else if (bitmap_file) {
	146	fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
	147	return 1;
82b27616 NB	148	}
82b27616 NB	149	/* now add the devices */
cd29a5c8	150	for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
fe80f49b NB	151	unsigned long dsize;
fe80f49b NB	152	int fd;
98ce3849 NB	153	if (strcmp("missing", dv->devname) == 0)
98ce3849 NB	154	continue;
cd29a5c8	155	if (stat(dv->devname, &stb)) {
98ce3849	156	fprintf(stderr, Name ": Weird: %s has disappeared.\n",
cd29a5c8	157	dv->devname);
82b27616 NB	158	goto abort;
82b27616 NB	159	}
cd29a5c8	160	if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
82b27616	161	fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
cd29a5c8	162	dv->devname);
82b27616 NB	163	goto abort;
82b27616 NB	164	}
fe80f49b NB	165	fd = open(dv->devname, O_RDONLY\|O_EXCL);
	166	if (fd < 0) {
	167	fprintf(stderr, Name ": Cannot open %s: %s\n",
	168	dv->devname, strerror(errno));
	169	goto abort;
	170	}
	171	if (ioctl(fd, BLKGETSIZE, &dsize) == 0 && dsize > 0) {
	172	unsigned long long ldsize = dsize;
	173	ldsize <<= 9;
	174	if (size== 0 \|\| ldsize < size)
	175	size = ldsize;
	176	}
	177	close(fd);
cd29a5c8	178	if (vers>= 9000) {
82b27616 NB	179	mdu_disk_info_t disk;
	180	disk.number = i;
	181	disk.raid_disk = i;
dfd4d8ee NB	182	disk.state = (1<<MD_DISK_SYNC) \| (1<<MD_DISK_ACTIVE);
	183	if (dv->writemostly)
	184	disk.state \|= 1<<MD_DISK_WRITEMOSTLY;
0df46c2a NB	185	disk.major = major(stb.st_rdev);
0df46c2a NB	186	disk.minor = minor(stb.st_rdev);
82b27616 NB	187	if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
82b27616 NB	188	fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
cd29a5c8	189	dv->devname, strerror(errno));
82b27616 NB	190	goto abort;
	191	}
	192	} else {
	193	if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
e0d19036	194	fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
cd29a5c8	195	dv->devname, strerror(errno));
82b27616 NB	196	goto abort;
	197	}
	198	}
	199	}
	200	/* now to start it */
cd29a5c8	201	if (vers >= 9000) {
82b27616	202	mdu_param_t param; /* not used by syscall */
c82f047c NB	203	if (bitmap_file) {
	204	bitmap_fd = open(bitmap_file, O_RDWR);
	205	if (bitmap_fd < 0) {
dcec9ee5	206	int major = BITMAP_MAJOR_HI;
1bfdbe01	207	#if 0
c82f047c NB	208	if (bitmap_chunk == UnSet) {
	209	fprintf(stderr, Name ": %s cannot be openned.",
	210	bitmap_file);
	211	return 1;
	212	}
1bfdbe01	213	#endif
dcec9ee5 NB	214	if (vers < 9003) {
	215	major = BITMAP_MAJOR_HOSTENDIAN;
	216	#ifdef __BIG_ENDIAN
	217	fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
1bfdbe01	218	" between different architectures. Consider upgrading the Linux kernel.\n");
dcec9ee5 NB	219	#endif
dcec9ee5 NB	220	}
f9c25f1d	221	bitmapsize = size>>9; /* FIXME wrong for RAID10 */
c82f047c	222	if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
f9c25f1d	223	delay, write_behind, bitmapsize, major)) {
c82f047c NB	224	return 1;
	225	}
	226	bitmap_fd = open(bitmap_file, O_RDWR);
	227	if (bitmap_fd < 0) {
	228	fprintf(stderr, Name ": %s cannot be openned.",
	229	bitmap_file);
	230	return 1;
	231	}
	232	}
	233	if (bitmap_fd >= 0) {
	234	if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
	235	fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
	236	mddev, strerror(errno));
	237	return 1;
	238	}
	239	}
	240	}
cd29a5c8	241	if (ioctl(mdfd, RUN_ARRAY, &param)) {
82b27616 NB	242	fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
	243	strerror(errno));
	244	goto abort;
	245	}
	246	} else {
cd29a5c8	247	unsigned long arg;
82b27616 NB	248	arg=0;
	249	while (chunk > 4096) {
	250	arg++;
	251	chunk >>= 1;
	252	}
	253	if (level == 0)
	254	chunk \|= 0x20000;
	255	else chunk \|= 0x10000;
	256	if (ioctl(mdfd, START_MD, arg)) {
	257	fprintf(stderr, Name ": START_MD failed: %s\n",
	258	strerror(errno));
	259	goto abort;
	260	}
	261	}
dab6685f NB	262	if (verbose >= 0)
	263	fprintf(stderr, Name ": array %s built and started.\n",
	264	mddev);
82b27616 NB	265	return 0;
	266
	267	abort:
cd29a5c8	268	if (vers >= 9000)
82b27616 NB	269	ioctl(mdfd, STOP_ARRAY, 0);
	270	else
	271	ioctl(mdfd, STOP_MD, 0);
	272	return 1;
	273
64c4757e	274	}