Annotation of prex-old/usr/server/fs/devfs/devfs_vnops.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <sys/stat.h>
! 32: #include <sys/vnode.h>
! 33: #include <sys/file.h>
! 34: #include <sys/mount.h>
! 35: #include <sys/syslog.h>
! 36:
! 37: #include <ctype.h>
! 38: #include <unistd.h>
! 39: #include <errno.h>
! 40: #include <string.h>
! 41: #include <stdlib.h>
! 42: #include <limits.h>
! 43: #include <fcntl.h>
! 44:
! 45: #include "devfs.h"
! 46:
! 47:
! 48: #define devfs_mount ((vfsop_mount_t)vfs_nullop)
! 49: #define devfs_unmount ((vfsop_umount_t)vfs_nullop)
! 50: #define devfs_sync ((vfsop_sync_t)vfs_nullop)
! 51: #define devfs_vget ((vfsop_vget_t)vfs_nullop)
! 52: #define devfs_statfs ((vfsop_statfs_t)vfs_nullop)
! 53:
! 54: static int devfs_open(vnode_t, mode_t);
! 55: static int devfs_close(vnode_t, file_t);
! 56: static int devfs_read(vnode_t, file_t, void *, size_t, size_t *);
! 57: static int devfs_write(vnode_t, file_t, void *, size_t, size_t *);
! 58: #define devfs_seek ((vnop_seek_t)vop_nullop)
! 59: static int devfs_ioctl(vnode_t, file_t, int, u_long);
! 60: #define devfs_fsync ((vnop_fsync_t)vop_nullop)
! 61: static int devfs_readdir(vnode_t, file_t, struct dirent *);
! 62: static int devfs_lookup(vnode_t, char *, vnode_t);
! 63: #define devfs_create ((vnop_create_t)vop_einval)
! 64: #define devfs_remove ((vnop_remove_t)vop_einval)
! 65: #define devfs_rename ((vnop_rename_t)vop_einval)
! 66: #define devfs_mkdir ((vnop_mkdir_t)vop_einval)
! 67: #define devfs_rmdir ((vnop_rmdir_t)vop_einval)
! 68: #define devfs_getattr ((vnop_getattr_t)vop_nullop)
! 69: #define devfs_setattr ((vnop_setattr_t)vop_nullop)
! 70: #define devfs_inactive ((vnop_inactive_t)vop_nullop)
! 71: #define devfs_truncate ((vnop_truncate_t)vop_nullop)
! 72:
! 73: struct vnops devfs_vnops;
! 74:
! 75: /*
! 76: * File system operations
! 77: */
! 78: struct vfsops devfs_vfsops = {
! 79: devfs_mount, /* mount */
! 80: devfs_unmount, /* unmount */
! 81: devfs_sync, /* sync */
! 82: devfs_vget, /* vget */
! 83: devfs_statfs, /* statfs */
! 84: &devfs_vnops, /* vnops */
! 85: };
! 86:
! 87: /*
! 88: * vnode operations
! 89: */
! 90: struct vnops devfs_vnops = {
! 91: devfs_open, /* open */
! 92: devfs_close, /* close */
! 93: devfs_read, /* read */
! 94: devfs_write, /* write */
! 95: devfs_seek, /* seek */
! 96: devfs_ioctl, /* ioctl */
! 97: devfs_fsync, /* fsync */
! 98: devfs_readdir, /* readdir */
! 99: devfs_lookup, /* lookup */
! 100: devfs_create, /* create */
! 101: devfs_remove, /* remove */
! 102: devfs_rename, /* remame */
! 103: devfs_mkdir, /* mkdir */
! 104: devfs_rmdir, /* rmdir */
! 105: devfs_getattr, /* getattr */
! 106: devfs_setattr, /* setattr */
! 107: devfs_inactive, /* inactive */
! 108: devfs_truncate, /* truncate */
! 109: };
! 110:
! 111: static int
! 112: devfs_open(vnode_t vp, mode_t mode)
! 113: {
! 114: char *path;
! 115: device_t dev;
! 116: int err;
! 117:
! 118: dprintf("devfs_open: path=%s\n", vp->v_path);
! 119:
! 120: path = vp->v_path;
! 121: if (!strcmp(path, "/")) /* root ? */
! 122: return 0;
! 123:
! 124: if (*path == '/')
! 125: path++;
! 126: err = device_open(path, mode & DO_RWMASK, &dev);
! 127: if (err) {
! 128: dprintf("devfs_open: can not open device = %s error=%d\n",
! 129: path, err);
! 130: return err;
! 131: }
! 132: vp->v_data = (void *)dev; /* Store private data */
! 133: return 0;
! 134: }
! 135:
! 136: static int
! 137: devfs_close(vnode_t vp, file_t fp)
! 138: {
! 139:
! 140: dprintf("devfs_close: fp=%x\n", fp);
! 141:
! 142: if (!strcmp(vp->v_path, "/")) /* root ? */
! 143: return 0;
! 144:
! 145: return device_close((device_t)vp->v_data);
! 146: }
! 147:
! 148: static int
! 149: devfs_read(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
! 150: {
! 151: int err;
! 152: size_t len;
! 153:
! 154: len = size;
! 155: err = device_read((device_t)vp->v_data, buf, &len, fp->f_offset);
! 156: if (!err)
! 157: *result = len;
! 158: return err;
! 159: }
! 160:
! 161: static int
! 162: devfs_write(vnode_t vp, file_t fp, void *buf, size_t size, size_t *result)
! 163: {
! 164: int err;
! 165: size_t len;
! 166:
! 167: len = size;
! 168: err = device_write((device_t)vp->v_data, buf, &len, fp->f_offset);
! 169: if (!err)
! 170: *result = len;
! 171: dprintf("devfs_write: err=%d len=%d\n", err, len);
! 172: return err;
! 173: }
! 174:
! 175: static int
! 176: devfs_ioctl(vnode_t vp, file_t fp, int cmd, u_long arg)
! 177: {
! 178: dprintf("devfs_ioctl\n");
! 179: return EINVAL;
! 180: }
! 181:
! 182: static int
! 183: devfs_lookup(vnode_t dvp, char *name, vnode_t vp)
! 184: {
! 185: struct info_device info;
! 186: int err, i;
! 187:
! 188: dprintf("devfs_lookup:%s\n", name);
! 189:
! 190: if (*name == '\0')
! 191: return ENOENT;
! 192:
! 193: i = 0;
! 194: err = 0;
! 195: info.cookie = 0;
! 196: for (;;) {
! 197: err = sys_info(INFO_DEVICE, &info);
! 198: if (err)
! 199: return ENOENT;
! 200: if (!strncmp(info.name, name, MAXDEVNAME))
! 201: break;
! 202: i++;
! 203: }
! 204: vp->v_type = (info.flags & DF_CHR) ? VCHR : VBLK;
! 205: vp->v_mode = (mode_t)(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP
! 206: | S_IROTH | S_IWOTH);
! 207: return 0;
! 208: }
! 209:
! 210: /*
! 211: * @vp: vnode of the directory.
! 212: */
! 213: static int
! 214: devfs_readdir(vnode_t vp, file_t fp, struct dirent *dir)
! 215: {
! 216: struct info_device info;
! 217: int err, i;
! 218:
! 219: dprintf("devfs_readdir offset=%d\n", fp->f_offset);
! 220:
! 221: i = 0;
! 222: err = 0;
! 223: info.cookie = 0;
! 224: do {
! 225: err = sys_info(INFO_DEVICE, &info);
! 226: if (err)
! 227: return ENOENT;
! 228: } while (i++ != fp->f_offset);
! 229:
! 230: dir->d_type = 0;
! 231: if (info.flags & DF_CHR)
! 232: dir->d_type = DT_CHR;
! 233: else if (info.flags & DF_BLK)
! 234: dir->d_type = DT_BLK;
! 235: strcpy((char *)&dir->d_name, info.name);
! 236: dir->d_fileno = fp->f_offset;
! 237: dir->d_namlen = strlen(dir->d_name);
! 238:
! 239: dprintf("devfs_readdir: %s\n", dir->d_name);
! 240: fp->f_offset++;
! 241: return 0;
! 242: }
! 243:
! 244: int
! 245: devfs_init(void)
! 246: {
! 247: return 0;
! 248: }
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