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devnodes.c revision 1.7
      1  1.7  joerg /*	$NetBSD: devnodes.c,v 1.7 2012/09/21 16:38:54 joerg Exp $	*/
      2  1.1  pooka 
      3  1.1  pooka /*
      4  1.1  pooka  * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
      5  1.1  pooka  *
      6  1.1  pooka  * Redistribution and use in source and binary forms, with or without
      7  1.1  pooka  * modification, are permitted provided that the following conditions
      8  1.1  pooka  * are met:
      9  1.1  pooka  * 1. Redistributions of source code must retain the above copyright
     10  1.1  pooka  *    notice, this list of conditions and the following disclaimer.
     11  1.1  pooka  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.1  pooka  *    notice, this list of conditions and the following disclaimer in the
     13  1.1  pooka  *    documentation and/or other materials provided with the distribution.
     14  1.1  pooka  *
     15  1.1  pooka  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  1.1  pooka  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  1.1  pooka  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  1.1  pooka  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  1.1  pooka  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  1.1  pooka  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  1.1  pooka  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  1.1  pooka  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  1.1  pooka  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  1.1  pooka  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  1.1  pooka  * SUCH DAMAGE.
     26  1.1  pooka  */
     27  1.1  pooka 
     28  1.1  pooka #include <sys/cdefs.h>
     29  1.7  joerg __KERNEL_RCSID(0, "$NetBSD: devnodes.c,v 1.7 2012/09/21 16:38:54 joerg Exp $");
     30  1.1  pooka 
     31  1.1  pooka #include <sys/param.h>
     32  1.1  pooka #include <sys/device.h>
     33  1.1  pooka #include <sys/filedesc.h>
     34  1.1  pooka #include <sys/kmem.h>
     35  1.1  pooka #include <sys/lwp.h>
     36  1.5  pooka #include <sys/namei.h>
     37  1.1  pooka #include <sys/stat.h>
     38  1.1  pooka #include <sys/vfs_syscalls.h>
     39  1.1  pooka 
     40  1.1  pooka #include "rump_vfs_private.h"
     41  1.1  pooka 
     42  1.1  pooka /* realqvik(tm) "devfs" */
     43  1.1  pooka int
     44  1.4  pooka rump_vfs_makeonedevnode(dev_t devtype, const char *devname,
     45  1.4  pooka 	devmajor_t majnum, devminor_t minnum)
     46  1.4  pooka {
     47  1.4  pooka 	register_t retval;
     48  1.5  pooka 	int error;
     49  1.4  pooka 
     50  1.5  pooka 	error = do_sys_mknod(curlwp, devname, 0666 | devtype,
     51  1.4  pooka 	    makedev(majnum, minnum), &retval, UIO_SYSSPACE);
     52  1.5  pooka 	if (error == EEXIST) /* XXX: should check it's actually the same */
     53  1.5  pooka 		error = 0;
     54  1.5  pooka 
     55  1.5  pooka 	return 0;
     56  1.4  pooka }
     57  1.4  pooka 
     58  1.4  pooka int
     59  1.1  pooka rump_vfs_makedevnodes(dev_t devtype, const char *basename, char minchar,
     60  1.1  pooka 	devmajor_t maj, devminor_t minnum, int nnodes)
     61  1.1  pooka {
     62  1.3   tron 	int error = 0;
     63  1.1  pooka 	char *devname, *p;
     64  1.1  pooka 	size_t devlen;
     65  1.1  pooka 	register_t retval;
     66  1.1  pooka 
     67  1.2  pooka 	devlen = strlen(basename) + 1 + 1; /* +letter +0 */
     68  1.1  pooka 	devname = kmem_zalloc(devlen, KM_SLEEP);
     69  1.2  pooka 	strlcpy(devname, basename, devlen);
     70  1.1  pooka 	p = devname + devlen-2;
     71  1.1  pooka 
     72  1.1  pooka 	for (; nnodes > 0; nnodes--, minchar++, minnum++) {
     73  1.1  pooka 		KASSERT(minchar <= 'z');
     74  1.1  pooka 		*p = minchar;
     75  1.1  pooka 
     76  1.1  pooka 		if ((error = do_sys_mknod(curlwp, devname, 0666 | devtype,
     77  1.5  pooka 		    makedev(maj, minnum), &retval, UIO_SYSSPACE))) {
     78  1.5  pooka 			if (error == EEXIST)
     79  1.5  pooka 				error = 0;
     80  1.5  pooka 			else
     81  1.5  pooka 				goto out;
     82  1.5  pooka 		}
     83  1.1  pooka 	}
     84  1.1  pooka 
     85  1.1  pooka  out:
     86  1.1  pooka 	kmem_free(devname, devlen);
     87  1.1  pooka 	return error;
     88  1.1  pooka }
     89  1.5  pooka 
     90  1.5  pooka enum { NOTEXIST, SAME, DIFFERENT };
     91  1.5  pooka static int
     92  1.5  pooka doesitexist(const char *path, bool isblk, devmajor_t dmaj, devminor_t dmin)
     93  1.5  pooka {
     94  1.5  pooka 	struct stat sb;
     95  1.5  pooka 	int error;
     96  1.5  pooka 
     97  1.5  pooka 	error = do_sys_stat(path, 0, &sb);
     98  1.5  pooka 	/* even if not ENOENT, we might be able to create it */
     99  1.5  pooka 	if (error)
    100  1.5  pooka 		return NOTEXIST;
    101  1.5  pooka 
    102  1.5  pooka 	if (major(sb.st_rdev) != dmaj || minor(sb.st_rdev) != dmin)
    103  1.5  pooka 		return DIFFERENT;
    104  1.5  pooka 	if (isblk && !S_ISBLK(sb.st_mode))
    105  1.5  pooka 		return DIFFERENT;
    106  1.5  pooka 	if (!isblk && !S_ISCHR(sb.st_mode))
    107  1.5  pooka 		return DIFFERENT;
    108  1.5  pooka 
    109  1.5  pooka 	return SAME;
    110  1.5  pooka }
    111  1.5  pooka 
    112  1.5  pooka static void
    113  1.5  pooka makeonenode(char *buf, devmajor_t blk, devmajor_t chr, devminor_t dmin,
    114  1.5  pooka 	const char *base, int c1, int c2)
    115  1.5  pooka {
    116  1.5  pooka 	char cstr1[2] = {0,0}, cstr2[2] = {0,0};
    117  1.5  pooka 	register_t rv;
    118  1.5  pooka 	int error;
    119  1.5  pooka 
    120  1.5  pooka 	if (c1 != -1) {
    121  1.5  pooka 		cstr1[0] = '0' + c1;
    122  1.5  pooka 		cstr1[1] = '\0';
    123  1.5  pooka 	}
    124  1.5  pooka 
    125  1.5  pooka 	if (c2 != -1) {
    126  1.5  pooka 		cstr2[0] = 'a' + c2;
    127  1.5  pooka 		cstr2[1] = '\0';
    128  1.5  pooka 
    129  1.5  pooka 	}
    130  1.5  pooka 
    131  1.5  pooka 	/* block device */
    132  1.5  pooka 	snprintf(buf, MAXPATHLEN, "/dev/%s%s%s", base, cstr1, cstr2);
    133  1.7  joerg 	if (blk != NODEVMAJOR) {
    134  1.5  pooka 		switch (doesitexist(buf, true, blk, dmin)) {
    135  1.5  pooka 		case DIFFERENT:
    136  1.5  pooka 			aprint_verbose("mkdevnodes: block device %s "
    137  1.5  pooka 			    "already exists\n", buf);
    138  1.5  pooka 			break;
    139  1.5  pooka 		case NOTEXIST:
    140  1.5  pooka 			if ((error = do_sys_mknod(curlwp, buf, 0600 | S_IFBLK,
    141  1.5  pooka 			    makedev(blk, dmin), &rv, UIO_SYSSPACE)) != 0)
    142  1.5  pooka 				aprint_verbose("mkdevnodes: failed to "
    143  1.5  pooka 				    "create %s: %d\n", buf, error);
    144  1.5  pooka 			break;
    145  1.5  pooka 		case SAME:
    146  1.5  pooka 			/* done */
    147  1.5  pooka 			break;
    148  1.5  pooka 		}
    149  1.5  pooka 		sprintf(buf, "/dev/r%s%s%s", base, cstr1, cstr2);
    150  1.5  pooka 	}
    151  1.5  pooka 
    152  1.5  pooka 	switch (doesitexist(buf, true, chr, dmin)) {
    153  1.5  pooka 	case DIFFERENT:
    154  1.5  pooka 		aprint_verbose("mkdevnodes: character device %s "
    155  1.5  pooka 		    "already exists\n", buf);
    156  1.5  pooka 		break;
    157  1.5  pooka 	case NOTEXIST:
    158  1.5  pooka 		if ((error = do_sys_mknod(curlwp, buf, 0600 | S_IFCHR,
    159  1.5  pooka 		    makedev(chr, dmin), &rv, UIO_SYSSPACE)) != 0)
    160  1.5  pooka 			aprint_verbose("mkdevnodes: failed to "
    161  1.5  pooka 			    "create %s: %d\n", buf, error);
    162  1.5  pooka 		break;
    163  1.5  pooka 	case SAME:
    164  1.5  pooka 		/* yeehaa */
    165  1.5  pooka 		break;
    166  1.5  pooka 	}
    167  1.5  pooka }
    168  1.5  pooka 
    169  1.5  pooka void
    170  1.5  pooka rump_vfs_builddevs(struct devsw_conv *dcvec, size_t dcvecsize)
    171  1.5  pooka {
    172  1.5  pooka 	char *pnbuf = PNBUF_GET();
    173  1.6  pooka 	devminor_t themin;
    174  1.5  pooka 	struct devsw_conv *dc;
    175  1.5  pooka 	size_t i;
    176  1.5  pooka 	int v1, v2;
    177  1.5  pooka 
    178  1.5  pooka 	for (i = 0; i < dcvecsize; i++) {
    179  1.5  pooka 		dc = &dcvec[i];
    180  1.5  pooka 
    181  1.5  pooka 		switch (dc->d_class) {
    182  1.5  pooka 		case DEVNODE_DONTBOTHER:
    183  1.5  pooka 			break;
    184  1.5  pooka 		case DEVNODE_SINGLE:
    185  1.6  pooka 			if (dc->d_flags & DEVNODE_FLAG_ISMINOR0) {
    186  1.6  pooka 				themin = dc->d_vectdim[0];
    187  1.6  pooka 			} else {
    188  1.6  pooka 				themin = 0;
    189  1.6  pooka 			}
    190  1.5  pooka 			makeonenode(pnbuf,
    191  1.6  pooka 			    dc->d_bmajor, dc->d_cmajor, themin,
    192  1.6  pooka 			    dc->d_name, -1, -1);
    193  1.5  pooka 			break;
    194  1.5  pooka 		case DEVNODE_VECTOR:
    195  1.5  pooka 			for (v1 = 0; v1 < dc->d_vectdim[0]; v1++) {
    196  1.5  pooka 				if (dc->d_vectdim[1] == 0) {
    197  1.5  pooka 					makeonenode(pnbuf,
    198  1.5  pooka 					    dc->d_bmajor, dc->d_cmajor,
    199  1.5  pooka 					    v1, dc->d_name, v1, -1);
    200  1.5  pooka 				} else {
    201  1.5  pooka 					for (v2 = 0;
    202  1.5  pooka 					    v2 < dc->d_vectdim[1]; v2++) {
    203  1.5  pooka 						makeonenode(pnbuf,
    204  1.5  pooka 						    dc->d_bmajor, dc->d_cmajor,
    205  1.5  pooka 						    v1 * dc->d_vectdim[1] + v2,
    206  1.5  pooka 						    dc->d_name, v1, v2);
    207  1.5  pooka 					}
    208  1.5  pooka 				}
    209  1.5  pooka 			}
    210  1.5  pooka 
    211  1.5  pooka 			/* add some extra sanity checks here */
    212  1.5  pooka 			if (dc->d_flags & DEVNODE_FLAG_LINKZERO) {
    213  1.5  pooka 				/*
    214  1.5  pooka 				 * ok, so we cheat a bit since
    215  1.5  pooka 				 * symlink isn't supported on rumpfs ...
    216  1.5  pooka 				 */
    217  1.5  pooka 				makeonenode(pnbuf, -1, dc->d_cmajor, 0,
    218  1.5  pooka 				    dc->d_name, -1, -1);
    219  1.5  pooka 
    220  1.5  pooka 			}
    221  1.5  pooka 			break;
    222  1.5  pooka 		}
    223  1.5  pooka 	}
    224  1.5  pooka 
    225  1.5  pooka 	PNBUF_PUT(pnbuf);
    226  1.5  pooka }
    227