[thirdparty/mdadm.git] / mdopen.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"
#include "md_p.h"
#include <ctype.h>


void make_parts(char *dev, int cnt)
{
	/* make 'cnt' partition devices for 'dev'
	 * If dev is a device name we use the
	 *  major/minor from dev and add 1..cnt
	 * If it is a symlink, we make similar symlinks.
	 * If dev ends with a digit, we add "p%d" else "%d"
	 * If the name exists, we use it's owner/mode,
	 * else that of dev
	 */
	struct stat stb;
	int major_num = major_num; /* quiet gcc -Os unitialized warning */
	int minor_num = minor_num; /* quiet gcc -Os unitialized warning */
	int odig = odig; /* quiet gcc -Os unitialized warning */
	int i;
	int nlen = strlen(dev) + 20;
	char *name = malloc(nlen);
	int dig = isdigit(dev[strlen(dev)-1]);
	char orig[1024];
	char sym[1024];
	int err;

	if (cnt==0) cnt=4;
	if (lstat(dev, &stb)!= 0)
		return;
	if (S_ISLNK(stb.st_mode)) {
		int len = readlink(dev, orig, sizeof(orig));
		if (len < 0 || len > 1000)
			return;
		orig[len] = 0;
		odig = isdigit(orig[len-1]);
	} else if (S_ISBLK(stb.st_mode)) {
		major_num = major(stb.st_rdev);
		minor_num = minor(stb.st_rdev);
	} else
		   return;
	for (i=1; i <= cnt ; i++) {
		struct stat stb2;
		snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i);
		if (stat(name, &stb2)==0) {
			if (!S_ISBLK(stb2.st_mode))
				continue;
			if (stb2.st_rdev == makedev(major_num, minor_num+i))
				continue;
			unlink(name);
		} else {
			stb2 = stb;
		}
		if (S_ISBLK(stb.st_mode)) {
			if (mknod(name, S_IFBLK | 0600,
				  makedev(major_num, minor_num+i)))
				perror("mknod");
			if (chown(name, stb2.st_uid, stb2.st_gid))
				perror("chown");
			if (chmod(name, stb2.st_mode & 07777))
				perror("chmod");
			err = 0;
		} else {
			snprintf(sym, sizeof(sym), "%s%s%d", orig, odig?"p":"", i);
			err = symlink(sym, name);
		}

		if (err == 0 && stat(name, &stb2) == 0)
			add_dev(name, &stb2, 0, NULL);
	}
}


/*
 * We need a new md device to assemble/build/create an array.
 * 'dev' is a name given us by the user (command line or mdadm.conf)
 * It might start with /dev or /dev/md any might end with a digit
 * string.
 * If it starts with just /dev, it must be /dev/mdX or /dev/md_dX
 * If it ends with a digit string, then it must be as above, or
 * 'trustworthy' must be 'METADATA' and the 'dev' must be
 *  /dev/md/'name'NN or 'name'NN
 * If it doesn't end with a digit string, it must be /dev/md/'name'
 * or 'name' or must be NULL.
 * If the digit string is present, it gives the minor number to use
 * If not, we choose a high, unused minor number.
 * If the 'dev' is a standard name, it devices whether 'md' or 'mdp'.
 * else if the name is 'd[0-9]+' then we use mdp
 * else if trustworthy is 'METADATA' we use md
 * else the choice depends on 'autof'.
 * If name is NULL it is assumed to match whatever dev provides.
 * If both name and dev are NULL, we choose a name 'mdXX' or 'mdpXX'
 *
 * If 'name' is given, and 'trustworthy' is 'foreign' and name is not
 * supported by 'dev', we add a "_%d" suffix based on the minor number
 * use that.
 *
 * If udev is configured, we create a temporary device, open it, and 
 * unlink it.
 * If not, we create the /dev/mdXX device, and is name is usable,
 * /dev/md/name
 * In any case we return /dev/md/name or (if that isn't available)
 * /dev/mdXX in 'chosen'.
 *
 * When we create devices, we use uid/gid/umask from config file.
 */

int create_mddev(char *dev, char *name, int autof, int trustworthy,
		 char *chosen)
{
	int mdfd;
	struct stat stb;
	int num = -1;
	int use_mdp = -1;
	struct createinfo *ci = conf_get_create_info();
	int parts;
	char *cname;
	char devname[20];
	char cbuf[400];
	if (chosen == NULL)
		chosen = cbuf;


	if (autof == 0)
		autof = ci->autof;

	parts = autof >> 3;
	autof &= 7;

	strcpy(chosen, "/dev/md/");
	cname = chosen + strlen(chosen);


	if (dev) {
		
		if (strncmp(dev, "/dev/md/", 8) == 0) {
			strcpy(cname, dev+8);
		} else if (strncmp(dev, "/dev/", 5) == 0) {
			char *e = dev + strlen(dev);
			while (e > dev && isdigit(e[-1]))
				e--;
			if (e[0])
				num = strtoul(e, NULL, 10);
			strcpy(cname, dev+5);
			cname[e-(dev+5)] = 0;
			/* name *must* be mdXX or md_dXX in this context */
			if (num < 0 ||
			    (strcmp(cname, "md") != 0 && strcmp(cname, "md_d") != 0)) {
				fprintf(stderr, Name ": %s is an invalid name "
					"for an md device.  Try /dev/md/%s\n",
					dev, dev+5);
				return -1;
			}
			if (strcmp(cname, "md") == 0)
				use_mdp = 0;
			else
				use_mdp = 1;
			/* recreate name: /dev/md/0 or /dev/md/d0 */
			sprintf(cname, "%s%d", use_mdp?"d":"", num);
		} else
			strcpy(cname, dev);

		/* 'cname' must not contain a slash, and may not be
		 * empty.
		 */
		if (strchr(cname, '/') != NULL) {
			fprintf(stderr, Name ": %s is an invalid name "
				"for an md device.\n", dev);
			return -1;
		}
		if (cname[0] == 0) {
			fprintf(stderr, Name ": %s is an invalid name "
				"for an md device (empty!).", dev);
			return -1;
		}
		if (num < 0) {
			/* If cname  is 'N' or 'dN', we get dev number
			 * from there.
			 */
			char *sp = cname;
			char *ep;
			if (cname[0] == 'd')
				sp++;
			num = strtoul(sp, &ep, 10);
			if (ep == sp || *ep || num < 0)
				num = -1;
			else if (cname[0] == 'd')
				use_mdp = 1;
			else
				use_mdp = 0;
		}
	}

	/* Now determine device number */
	/* named 'METADATA' cannot use 'mdp'. */
	if (name && name[0] == 0)
		name = NULL;
	if (name && trustworthy == METADATA && use_mdp == 1) {
		fprintf(stderr, Name ": %s is not allowed for a %s container. "
			"Consider /dev/md%d.\n", dev, name, num);
		return -1;
	}
	if (name && trustworthy == METADATA)
		use_mdp = 0;
	if (use_mdp == -1) {
		if (autof == 4 || autof == 6)
			use_mdp = 1;
		else
			use_mdp = 0;
	}
	if (num < 0 && trustworthy == LOCAL && name) {
		/* if name is numeric, use that for num
		 * if it is not already in use */
		char *ep;
		num = strtoul(name, &ep, 10);
		if (ep == name || *ep)
			num = -1;
		else if (mddev_busy(use_mdp ? (-1-num) : num))
			num = -1;
	}

	if (num < 0) {
		/* need to choose a free number. */
		num = find_free_devnum(use_mdp);
		if (num == NoMdDev) {
			fprintf(stderr, Name ": No avail md devices - aborting\n");
			return -1;
		}
	} else {
		num = use_mdp ? (-1-num) : num;
		if (mddev_busy(num)) {
			fprintf(stderr, Name ": %s is already in use.\n",
				dev);
			return -1;
		}
	}

	if (num < 0)
		sprintf(devname, "/dev/md_d%d", -1-num);
	else
		sprintf(devname, "/dev/md%d", num);

	if (cname[0] == 0 && name) {
		/* Need to find a name if we can
		 * We don't completely trust 'name'.  Truncate to
		 * reasonable length and remove '/'
		 */
		char *cp;
		struct map_ent *map = NULL;
		int conflict = 1;
		int unum = 0;
		int cnlen;
		strncpy(cname, name, 200);
		cname[200] = 0;
		while ((cp = strchr(cname, '/')) != NULL)
			*cp = '-';
		if (trustworthy == LOCAL ||
		    (trustworthy == FOREIGN && strchr(cname, ':') != NULL)) {
			/* Only need suffix if there is a conflict */
			if (map_by_name(&map, cname) == NULL)
				conflict = 0;
		}
		cnlen = strlen(cname);
		while (conflict) {
			if (trustworthy == METADATA)
				sprintf(cname+cnlen, "%d", unum);
			else
				/* add _%d to FOREIGN array that don't 
				 * a 'host:' prefix
				 */
				sprintf(cname+cnlen, "_%d", unum);
			unum++;
			if (map_by_name(&map, cname) == NULL)
				conflict = 0;
		}
	}
	if (cname[0] == 0)
		strcpy(chosen, devname);

	/* We have a device number and name.
	 * If we cannot detect udev, we need to make
	 * devices and links ourselves.
	 */
	if (stat("/dev/.udev", &stb) != 0 ||
	    check_env("MDADM_NO_UDEV")) {
		/* Make sure 'devname' exists and 'chosen' is a symlink to it */
		if (lstat(devname, &stb) == 0) {
			/* Must be the correct device, else error */
			if ((stb.st_mode&S_IFMT) != S_IFBLK ||
			    stb.st_rdev != makedev(dev2major(num),dev2minor(num))) {
				fprintf(stderr, Name ": %s exists but looks wrong, please fix\n",
					devname);
				return -1;
			}
		} else {
			if (mknod(devname, S_IFBLK|0600,
				  makedev(dev2major(num),dev2minor(num))) != 0) {
				fprintf(stderr, Name ": failed to create %s\n",
					devname);
				return -1;
			}
			if (chown(devname, ci->uid, ci->gid))
				perror("chown");
			if (chmod(devname, ci->mode))
				perror("chmod");
			stat(devname, &stb);
			add_dev(devname, &stb, 0, NULL);
		}
		if (use_mdp == 1)
			make_parts(devname, parts);
		if (strcmp(chosen, devname) != 0) {

			if (mkdir("/dev/md",0700)==0) {
				if (chown("/dev/md", ci->uid, ci->gid))
					perror("chown /dev/md");
				if (chmod("/dev/md", ci->mode| ((ci->mode>>2) & 0111)))
					perror("chmod /dev/md");
			}

			if (dev && strcmp(chosen, dev) == 0)
				/* We know we are allowed to use this name */
				unlink(chosen);

			if (lstat(chosen, &stb) == 0) {
				char buf[300];
				if ((stb.st_mode & S_IFMT) != S_IFLNK ||
				    readlink(chosen, buf, 300) <0 ||
				    strcmp(buf, devname) != 0) {
					fprintf(stderr, Name ": %s exists - ignoring\n",
						chosen);
					strcpy(chosen, devname);
				}
			} else if (symlink(devname, chosen) != 0)
				fprintf(stderr, Name ": failed to create %s: %s\n",
					chosen, strerror(errno));
			if (use_mdp && strcmp(chosen, devname) != 0)
				make_parts(chosen, parts);
		}
	}
	mdfd = open_dev_excl(num);
	if (mdfd < 0)
		fprintf(stderr, Name ": unexpected failure opening %s\n",
			devname);
	return mdfd;
}


/* Open this and check that it is an md device.
 * On success, return filedescriptor.
 * On failure, return -1 if it doesn't exist,
 * or -2 if it exists but is not an md device.
 */
int open_mddev(char *dev, int report_errors)
{
	int mdfd = open(dev, O_RDWR);
	if (mdfd < 0) {
		if (report_errors)
			fprintf(stderr, Name ": error opening %s: %s\n",
				dev, strerror(errno));
		return -1;
	}
	if (md_get_version(mdfd) <= 0) {
		close(mdfd);
		if (report_errors)
			fprintf(stderr, Name ": %s does not appear to be "
				"an md device\n", dev);
		return -2;
	}
	return mdfd;
}
Commit	Line	Data
b5e64645 NB	1	/*
	2	* mdadm - manage Linux "md" devices aka RAID arrays.
	3	*
4f589ad0	4	* Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
b5e64645 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
	30	#include "mdadm.h"
	31	#include "md_p.h"
	32	#include <ctype.h>
	33
0a6e1c67	34
c4fe2d4f	35	void make_parts(char *dev, int cnt)
b5e64645 NB	36	{
b5e64645 NB	37	/* make 'cnt' partition devices for 'dev'
c4fe2d4f N	38	* If dev is a device name we use the
	39	* major/minor from dev and add 1..cnt
	40	* If it is a symlink, we make similar symlinks.
8d80900b	41	* If dev ends with a digit, we add "p%d" else "%d"
b5e64645 NB	42	* If the name exists, we use it's owner/mode,
	43	* else that of dev
	44	*/
	45	struct stat stb;
197e3eb6 DW	46	int major_num = major_num; /* quiet gcc -Os unitialized warning */
	47	int minor_num = minor_num; /* quiet gcc -Os unitialized warning */
	48	int odig = odig; /* quiet gcc -Os unitialized warning */
b5e64645	49	int i;
8f23b0b3 NB	50	int nlen = strlen(dev) + 20;
8f23b0b3 NB	51	char *name = malloc(nlen);
b5e64645	52	int dig = isdigit(dev[strlen(dev)-1]);
c4fe2d4f N	53	char orig[1024];
c4fe2d4f N	54	char sym[1024];
614825ea	55	int err;
b5e64645	56
f1ae21c4	57	if (cnt==0) cnt=4;
c4fe2d4f	58	if (lstat(dev, &stb)!= 0)
b5e64645	59	return;
c4fe2d4f N	60	if (S_ISLNK(stb.st_mode)) {
	61	int len = readlink(dev, orig, sizeof(orig));
	62	if (len < 0 \|\| len > 1000)
	63	return;
	64	orig[len] = 0;
	65	odig = isdigit(orig[len-1]);
	66	} else if (S_ISBLK(stb.st_mode)) {
	67	major_num = major(stb.st_rdev);
	68	minor_num = minor(stb.st_rdev);
	69	} else
	70	return;
b5e64645 NB	71	for (i=1; i <= cnt ; i++) {
b5e64645 NB	72	struct stat stb2;
8f23b0b3	73	snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i);
b5e64645 NB	74	if (stat(name, &stb2)==0) {
	75	if (!S_ISBLK(stb2.st_mode))
	76	continue;
b440882e	77	if (stb2.st_rdev == makedev(major_num, minor_num+i))
b5e64645 NB	78	continue;
	79	unlink(name);
	80	} else {
	81	stb2 = stb;
	82	}
c4fe2d4f N	83	if (S_ISBLK(stb.st_mode)) {
	84	if (mknod(name, S_IFBLK \| 0600,
	85	makedev(major_num, minor_num+i)))
	86	perror("mknod");
	87	if (chown(name, stb2.st_uid, stb2.st_gid))
	88	perror("chown");
	89	if (chmod(name, stb2.st_mode & 07777))
	90	perror("chmod");
614825ea	91	err = 0;
c4fe2d4f	92	} else {
e10a79c3	93	snprintf(sym, sizeof(sym), "%s%s%d", orig, odig?"p":"", i);
614825ea	94	err = symlink(sym, name);
c4fe2d4f	95	}
614825ea DW	96
	97	if (err == 0 && stat(name, &stb2) == 0)
	98	add_dev(name, &stb2, 0, NULL);
b5e64645 NB	99	}
	100	}
	101
0a6e1c67	102
b5e64645	103	/*
69207ff6 N	104	* We need a new md device to assemble/build/create an array.
	105	* 'dev' is a name given us by the user (command line or mdadm.conf)
	106	* It might start with /dev or /dev/md any might end with a digit
	107	* string.
	108	* If it starts with just /dev, it must be /dev/mdX or /dev/md_dX
	109	* If it ends with a digit string, then it must be as above, or
	110	* 'trustworthy' must be 'METADATA' and the 'dev' must be
	111	* /dev/md/'name'NN or 'name'NN
	112	* If it doesn't end with a digit string, it must be /dev/md/'name'
	113	* or 'name' or must be NULL.
	114	* If the digit string is present, it gives the minor number to use
	115	* If not, we choose a high, unused minor number.
	116	* If the 'dev' is a standard name, it devices whether 'md' or 'mdp'.
	117	* else if the name is 'd[0-9]+' then we use mdp
	118	* else if trustworthy is 'METADATA' we use md
	119	* else the choice depends on 'autof'.
	120	* If name is NULL it is assumed to match whatever dev provides.
	121	* If both name and dev are NULL, we choose a name 'mdXX' or 'mdpXX'
	122	*
	123	* If 'name' is given, and 'trustworthy' is 'foreign' and name is not
	124	* supported by 'dev', we add a "_%d" suffix based on the minor number
	125	* use that.
	126	*
	127	* If udev is configured, we create a temporary device, open it, and
	128	* unlink it.
	129	* If not, we create the /dev/mdXX device, and is name is usable,
	130	* /dev/md/name
	131	* In any case we return /dev/md/name or (if that isn't available)
	132	* /dev/mdXX in 'chosen'.
	133	*
	134	* When we create devices, we use uid/gid/umask from config file.
b5e64645	135	*/
69207ff6 N	136
	137	int create_mddev(char dev, char name, int autof, int trustworthy,
	138	char *chosen)
b5e64645 NB	139	{
	140	int mdfd;
	141	struct stat stb;
69207ff6 N	142	int num = -1;
69207ff6 N	143	int use_mdp = -1;
8aec876d	144	struct createinfo *ci = conf_get_create_info();
f1ae21c4	145	int parts;
69207ff6 N	146	char *cname;
	147	char devname[20];
	148	char cbuf[400];
	149	if (chosen == NULL)
	150	chosen = cbuf;
	151
b5e64645	152
5bbb4842 NB	153	if (autof == 0)
	154	autof = ci->autof;
	155
f1ae21c4 NB	156	parts = autof >> 3;
	157	autof &= 7;
	158
69207ff6 N	159	strcpy(chosen, "/dev/md/");
	160	cname = chosen + strlen(chosen);
	161
	162
	163	if (dev) {
	164
	165	if (strncmp(dev, "/dev/md/", 8) == 0) {
	166	strcpy(cname, dev+8);
	167	} else if (strncmp(dev, "/dev/", 5) == 0) {
	168	char *e = dev + strlen(dev);
	169	while (e > dev && isdigit(e[-1]))
	170	e--;
	171	if (e[0])
	172	num = strtoul(e, NULL, 10);
	173	strcpy(cname, dev+5);
	174	cname[e-(dev+5)] = 0;
	175	/* name must be mdXX or md_dXX in this context */
	176	if (num < 0 \|\|
	177	(strcmp(cname, "md") != 0 && strcmp(cname, "md_d") != 0)) {
	178	fprintf(stderr, Name ": %s is an invalid name "
	179	"for an md device. Try /dev/md/%s\n",
	180	dev, dev+5);
f1ae21c4 NB	181	return -1;
f1ae21c4 NB	182	}
69207ff6 N	183	if (strcmp(cname, "md") == 0)
	184	use_mdp = 0;
	185	else
	186	use_mdp = 1;
11fb4c05 N	187	/* recreate name: /dev/md/0 or /dev/md/d0 */
11fb4c05 N	188	sprintf(cname, "%s%d", use_mdp?"d":"", num);
69207ff6 N	189	} else
	190	strcpy(cname, dev);
	191
11fb4c05 N	192	/* 'cname' must not contain a slash, and may not be
11fb4c05 N	193	* empty.
69207ff6	194	*/
11fb4c05	195	if (strchr(cname, '/') != NULL) {
69207ff6 N	196	fprintf(stderr, Name ": %s is an invalid name "
	197	"for an md device.\n", dev);
	198	return -1;
f1ae21c4	199	}
11fb4c05	200	if (cname[0] == 0) {
69207ff6 N	201	fprintf(stderr, Name ": %s is an invalid name "
	202	"for an md device (empty!).", dev);
	203	return -1;
b5e64645	204	}
11fb4c05 N	205	if (num < 0) {
	206	/* If cname is 'N' or 'dN', we get dev number
	207	* from there.
	208	*/
	209	char *sp = cname;
	210	char *ep;
	211	if (cname[0] == 'd')
	212	sp++;
	213	num = strtoul(sp, &ep, 10);
	214	if (ep == sp \|\| *ep \|\| num < 0)
	215	num = -1;
	216	else if (cname[0] == 'd')
	217	use_mdp = 1;
	218	else
	219	use_mdp = 0;
	220	}
69207ff6	221	}
f1ae21c4	222
69207ff6 N	223	/* Now determine device number */
	224	/* named 'METADATA' cannot use 'mdp'. */
	225	if (name && name[0] == 0)
	226	name = NULL;
	227	if (name && trustworthy == METADATA && use_mdp == 1) {
	228	fprintf(stderr, Name ": %s is not allowed for a %s container. "
	229	"Consider /dev/md%d.\n", dev, name, num);
	230	return -1;
	231	}
	232	if (name && trustworthy == METADATA)
	233	use_mdp = 0;
	234	if (use_mdp == -1) {
	235	if (autof == 4 \|\| autof == 6)
	236	use_mdp = 1;
f1ae21c4	237	else
69207ff6 N	238	use_mdp = 0;
	239	}
	240	if (num < 0 && trustworthy == LOCAL && name) {
bde2c6e2 N	241	/* if name is numeric, use that for num
bde2c6e2 N	242	* if it is not already in use */
69207ff6 N	243	char *ep;
	244	num = strtoul(name, &ep, 10);
	245	if (ep == name \|\| *ep)
	246	num = -1;
bde2c6e2 N	247	else if (mddev_busy(use_mdp ? (-1-num) : num))
bde2c6e2 N	248	num = -1;
69207ff6 N	249	}
	250
	251	if (num < 0) {
	252	/* need to choose a free number. */
	253	num = find_free_devnum(use_mdp);
	254	if (num == NoMdDev) {
	255	fprintf(stderr, Name ": No avail md devices - aborting\n");
	256	return -1;
	257	}
	258	} else {
	259	num = use_mdp ? (-1-num) : num;
	260	if (mddev_busy(num)) {
	261	fprintf(stderr, Name ": %s is already in use.\n",
	262	dev);
	263	return -1;
	264	}
	265	}
	266
	267	if (num < 0)
	268	sprintf(devname, "/dev/md_d%d", -1-num);
	269	else
	270	sprintf(devname, "/dev/md%d", num);
f1ae21c4	271
69207ff6 N	272	if (cname[0] == 0 && name) {
	273	/* Need to find a name if we can
	274	* We don't completely trust 'name'. Truncate to
	275	* reasonable length and remove '/'
8d80900b	276	*/
69207ff6	277	char *cp;
f2e55ecc N	278	struct map_ent *map = NULL;
	279	int conflict = 1;
	280	int unum = 0;
	281	int cnlen;
69207ff6 N	282	strncpy(cname, name, 200);
	283	cname[200] = 0;
	284	while ((cp = strchr(cname, '/')) != NULL)
	285	*cp = '-';
f2e55ecc N	286	if (trustworthy == LOCAL \|\|
	287	(trustworthy == FOREIGN && strchr(cname, ':') != NULL)) {
	288	/* Only need suffix if there is a conflict */
	289	if (map_by_name(&map, cname) == NULL)
	290	conflict = 0;
	291	}
	292	cnlen = strlen(cname);
	293	while (conflict) {
	294	if (trustworthy == METADATA)
	295	sprintf(cname+cnlen, "%d", unum);
	296	else
	297	/* add _%d to FOREIGN array that don't
	298	* a 'host:' prefix
	299	*/
	300	sprintf(cname+cnlen, "_%d", unum);
	301	unum++;
	302	if (map_by_name(&map, cname) == NULL)
	303	conflict = 0;
	304	}
69207ff6 N	305	}
	306	if (cname[0] == 0)
	307	strcpy(chosen, devname);
8d80900b	308
69207ff6	309	/* We have a device number and name.
11fb4c05 N	310	* If we cannot detect udev, we need to make
11fb4c05 N	311	* devices and links ourselves.
69207ff6 N	312	*/
	313	if (stat("/dev/.udev", &stb) != 0 \|\|
	314	check_env("MDADM_NO_UDEV")) {
	315	/* Make sure 'devname' exists and 'chosen' is a symlink to it */
	316	if (lstat(devname, &stb) == 0) {
	317	/* Must be the correct device, else error */
	318	if ((stb.st_mode&S_IFMT) != S_IFBLK \|\|
	319	stb.st_rdev != makedev(dev2major(num),dev2minor(num))) {
	320	fprintf(stderr, Name ": %s exists but looks wrong, please fix\n",
	321	devname);
	322	return -1;
0a6e1c67	323	}
69207ff6 N	324	} else {
	325	if (mknod(devname, S_IFBLK\|0600,
	326	makedev(dev2major(num),dev2minor(num))) != 0) {
	327	fprintf(stderr, Name ": failed to create %s\n",
	328	devname);
b5e64645 NB	329	return -1;
b5e64645 NB	330	}
69207ff6 N	331	if (chown(devname, ci->uid, ci->gid))
	332	perror("chown");
	333	if (chmod(devname, ci->mode))
	334	perror("chmod");
	335	stat(devname, &stb);
	336	add_dev(devname, &stb, 0, NULL);
	337	}
c4fe2d4f N	338	if (use_mdp == 1)
c4fe2d4f N	339	make_parts(devname, parts);
69207ff6 N	340	if (strcmp(chosen, devname) != 0) {
	341
	342	if (mkdir("/dev/md",0700)==0) {
	343	if (chown("/dev/md", ci->uid, ci->gid))
	344	perror("chown /dev/md");
	345	if (chmod("/dev/md", ci->mode\| ((ci->mode>>2) & 0111)))
	346	perror("chmod /dev/md");
8d80900b	347	}
69207ff6 N	348
	349	if (dev && strcmp(chosen, dev) == 0)
	350	/* We know we are allowed to use this name */
	351	unlink(chosen);
	352
	353	if (lstat(chosen, &stb) == 0) {
	354	char buf[300];
	355	if ((stb.st_mode & S_IFMT) != S_IFLNK \|\|
	356	readlink(chosen, buf, 300) <0 \|\|
	357	strcmp(buf, devname) != 0) {
	358	fprintf(stderr, Name ": %s exists - ignoring\n",
	359	chosen);
	360	strcpy(chosen, devname);
	361	}
614825ea DW	362	} else if (symlink(devname, chosen) != 0)
	363	fprintf(stderr, Name ": failed to create %s: %s\n",
	364	chosen, strerror(errno));
c4fe2d4f N	365	if (use_mdp && strcmp(chosen, devname) != 0)
c4fe2d4f N	366	make_parts(chosen, parts);
b5e64645	367	}
b5e64645	368	}
69207ff6 N	369	mdfd = open_dev_excl(num);
	370	if (mdfd < 0)
	371	fprintf(stderr, Name ": unexpected failure opening %s\n",
	372	devname);
6be1d39d N	373	return mdfd;
	374	}
	375
69207ff6	376
6be1d39d N	377	/* Open this and check that it is an md device.
	378	* On success, return filedescriptor.
	379	* On failure, return -1 if it doesn't exist,
	380	* or -2 if it exists but is not an md device.
	381	*/
	382	int open_mddev(char *dev, int report_errors)
	383	{
	384	int mdfd = open(dev, O_RDWR);
	385	if (mdfd < 0) {
	386	if (report_errors)
	387	fprintf(stderr, Name ": error opening %s: %s\n",
	388	dev, strerror(errno));
	389	return -1;
	390	}
	391	if (md_get_version(mdfd) <= 0) {
b5e64645	392	close(mdfd);
6be1d39d N	393	if (report_errors)
	394	fprintf(stderr, Name ": %s does not appear to be "
	395	"an md device\n", dev);
	396	return -2;
b5e64645 NB	397	}
	398	return mdfd;
	399	}