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Annotation of sys/dev/bio.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $   */
                      2:
                      3: /*
                      4:  * Copyright (c) 2002 Niklas Hallqvist.  All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      9:  * 1. Redistributions of source code must retain the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer.
                     11:  * 2. Redistributions in binary form must reproduce the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer in the
                     13:  *    documentation and/or other materials provided with the distribution.
                     14:  *
                     15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     17:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     18:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     19:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     20:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     24:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26:
                     27: /* A device controller ioctl tunnelling device.  */
                     28:
                     29: #include <sys/param.h>
                     30: #include <sys/device.h>
                     31: #include <sys/ioctl.h>
                     32: #include <sys/malloc.h>
                     33: #include <sys/queue.h>
                     34: #include <sys/systm.h>
                     35:
                     36: #include <dev/biovar.h>
                     37:
                     38: struct bio_mapping {
                     39:        LIST_ENTRY(bio_mapping) bm_link;
                     40:        struct device *bm_dev;
                     41:        int (*bm_ioctl)(struct device *, u_long, caddr_t);
                     42: };
                     43:
                     44: LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
                     45:
                     46: void   bioattach(int);
                     47: int    bioclose(dev_t, int, int, struct proc *);
                     48: int    bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
                     49: int    bioopen(dev_t, int, int, struct proc *);
                     50:
                     51: int    bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t);
                     52: struct bio_mapping *bio_lookup(char *);
                     53: int    bio_validate(void *);
                     54:
                     55: void
                     56: bioattach(int nunits)
                     57: {
                     58: }
                     59:
                     60: int
                     61: bioopen(dev_t dev, int flags, int mode, struct proc *p)
                     62: {
                     63:        return (0);
                     64: }
                     65:
                     66: int
                     67: bioclose(dev_t dev, int flags, int mode, struct proc *p)
                     68: {
                     69:        return (0);
                     70: }
                     71:
                     72: int
                     73: bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
                     74: {
                     75:        struct bio_locate *locate;
                     76:        struct bio_common *common;
                     77:        char name[16];
                     78:        int error;
                     79:
                     80:        switch (cmd) {
                     81:        case BIOCLOCATE:
                     82:                locate = (struct bio_locate *)addr;
                     83:                error = copyinstr(locate->bl_name, name, 16, NULL);
                     84:                if (error != 0)
                     85:                        return (error);
                     86:                locate->bl_cookie = bio_lookup(name);
                     87:                if (locate->bl_cookie == NULL)
                     88:                        return (ENOENT);
                     89:                break;
                     90:
                     91:        default:
                     92:                common = (struct bio_common *)addr;
                     93:                if (!bio_validate(common->bc_cookie))
                     94:                        return (ENOENT);
                     95:                return (bio_delegate_ioctl(
                     96:                    (struct bio_mapping *)common->bc_cookie, cmd, addr));
                     97:        }
                     98:        return (0);
                     99: }
                    100:
                    101: int
                    102: bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
                    103: {
                    104:        struct bio_mapping *bm;
                    105:
                    106:        MALLOC(bm, struct bio_mapping *, sizeof *bm, M_DEVBUF, M_NOWAIT);
                    107:        if (bm == NULL)
                    108:                return (ENOMEM);
                    109:        bm->bm_dev = dev;
                    110:        bm->bm_ioctl = ioctl;
                    111:        LIST_INSERT_HEAD(&bios, bm, bm_link);
                    112:        return (0);
                    113: }
                    114:
                    115: void
                    116: bio_unregister(struct device *dev)
                    117: {
                    118:        struct bio_mapping *bm, *next;
                    119:
                    120:        for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
                    121:                next = LIST_NEXT(bm, bm_link);
                    122:
                    123:                if (dev == bm->bm_dev) {
                    124:                        LIST_REMOVE(bm, bm_link);
                    125:                        free(bm, M_DEVBUF);
                    126:                }
                    127:        }
                    128: }
                    129:
                    130: struct bio_mapping *
                    131: bio_lookup(char *name)
                    132: {
                    133:        struct bio_mapping *bm;
                    134:
                    135:        LIST_FOREACH(bm, &bios, bm_link)
                    136:                if (strcmp(name, bm->bm_dev->dv_xname) == 0)
                    137:                        return (bm);
                    138:        return (NULL);
                    139: }
                    140:
                    141: int
                    142: bio_validate(void *cookie)
                    143: {
                    144:        struct bio_mapping *bm;
                    145:
                    146:        LIST_FOREACH(bm, &bios, bm_link)
                    147:                if (bm == cookie)
                    148:                        return (1);
                    149:        return (0);
                    150: }
                    151:
                    152: int
                    153: bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, caddr_t addr)
                    154: {
                    155:        return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
                    156: }