devfs_devs.c revision 65132
1#define DEBUG 1 2/* 3 * Copyright (c) 2000 4 * Poul-Henning Kamp. 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. Neither the name of the University nor the names of its contributors 12 * may be used to endorse or promote products derived from this software 13 * without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36 28 * 29 * $FreeBSD: head/sys/fs/devfs/devfs_devs.c 65132 2000-08-27 14:46:36Z phk $ 30 */ 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/dirent.h> 35#include <sys/conf.h> 36#include <sys/vnode.h> 37#include <sys/malloc.h> 38#include <sys/eventhandler.h> 39#include <sys/ctype.h> 40 41#define DEVFS_INTERN 42#include <fs/devfs/devfs.h> 43 44struct devfs_dirent * 45devfs_find(struct devfs_dirent *dd, const char *name, int namelen) 46{ 47 struct devfs_dirent *de; 48 49 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 50 if (namelen != de->de_dirent->d_namlen) 51 continue; 52 if (bcmp(name, de->de_dirent->d_name, namelen) != 0) 53 continue; 54 break; 55 } 56 return (de); 57} 58 59struct devfs_dirent * 60devfs_newdirent(char *name, int namelen) 61{ 62 int i; 63 struct devfs_dirent *de; 64 struct dirent d; 65 66 d.d_namlen = namelen; 67 i = sizeof (*de) + GENERIC_DIRSIZ(&d); 68 MALLOC(de, struct devfs_dirent *, i, M_DEVFS, M_WAITOK); 69 bzero(de, i); 70 de->de_dirent = (struct dirent *)(de + 1); 71 de->de_dirent->d_namlen = namelen; 72 de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d); 73 bcopy(name, de->de_dirent->d_name, namelen + 1); 74 nanotime(&de->de_ctime); 75 de->de_mtime = de->de_atime = de->de_ctime; 76 de->de_links = 1; 77 return (de); 78} 79 80struct devfs_dirent * 81devfs_vmkdir(char *name, int namelen, struct devfs_dirent *dotdot) 82{ 83 struct devfs_dirent *dd; 84 struct devfs_dirent *de; 85 86 dd = devfs_newdirent(name, namelen); 87 88 TAILQ_INIT(&dd->de_dlist); 89 90 dd->de_dirent->d_type = DT_DIR; 91 dd->de_mode = 0755; 92 dd->de_links = 2; 93 dd->de_dir = dd; 94 95 de = devfs_newdirent(".", 1); 96 de->de_dirent->d_type = DT_DIR; 97 de->de_dir = dd; 98 de->de_flags |= DE_DOT; 99 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 100 101 de = devfs_newdirent("..", 2); 102 de->de_dirent->d_type = DT_DIR; 103 if (dotdot == NULL) 104 de->de_dir = dd; 105 else 106 de->de_dir = dotdot; 107 de->de_flags |= DE_DOTDOT; 108 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 109 110 return (dd); 111} 112 113static void 114devfs_delete(struct devfs_dirent *dd, struct devfs_dirent *de) 115{ 116 117 if (de->de_symlink) { 118 FREE(de->de_symlink, M_DEVFS); 119 de->de_symlink = NULL; 120 } 121 if (de->de_vnode) { 122 de->de_vnode->v_data = NULL; 123 vdrop(de->de_vnode); 124 } 125 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 126 FREE(de, M_DEVFS); 127} 128 129void 130devfs_purge(struct devfs_dirent *dd) 131{ 132 struct devfs_dirent *de; 133 134 for (;;) { 135 de = TAILQ_FIRST(&dd->de_dlist); 136 if (de == NULL) 137 break; 138 devfs_delete(dd, de); 139 } 140 FREE(dd, M_DEVFS); 141} 142 143 144int 145devfs_populate(struct devfs_mount *dm) 146{ 147 int i, j; 148 dev_t dev, pdev; 149 struct devfs_dirent *dd; 150 struct devfs_dirent *de; 151 char *q, *s; 152 153 while (dm->dm_generation != devfs_generation) { 154 dm->dm_generation = devfs_generation; 155 for (i = 0; i < NDEVINO; i++) { 156 dev = devfs_inot[i]; 157 de = dm->dm_dirent[i]; 158 if (dev == NULL && de == DE_DELETED) { 159 dm->dm_dirent[i] = NULL; 160 continue; 161 } 162 if (dev == NULL && de != NULL) { 163 dd = de->de_dir; 164 dm->dm_dirent[i] = NULL; 165 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 166 if (de->de_vnode) { 167 de->de_vnode->v_data = NULL; 168 vdrop(de->de_vnode); 169 } 170 FREE(de, M_DEVFS); 171 continue; 172 } 173 if (dev == NULL) 174 continue; 175 if (de != NULL) 176 continue; 177 dd = dm->dm_basedir; 178 s = dev->si_name; 179 for (;;) { 180 for (q = s; *q != '/' && *q != '\0'; q++) 181 continue; 182 if (*q != '/') 183 break; 184 de = devfs_find(dd, s, q - s); 185 if (de == NULL) { 186 de = devfs_vmkdir(s, q - s, dd); 187 de->de_inode = dm->dm_inode++; 188 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 189 dd->de_links++; 190 } 191 s = q + 1; 192 dd = de; 193 } 194 de = devfs_newdirent(s, q - s); 195 if (dev->si_flags & SI_ALIAS) { 196 de->de_inode = dm->dm_inode++; 197 de->de_uid = 0; 198 de->de_gid = 0; 199 de->de_mode = 0666; 200 de->de_dirent->d_type = DT_LNK; 201 pdev = dev->si_drv1; 202 j = strlen(pdev->si_name) + 1; 203 MALLOC(de->de_symlink, char *, j, M_DEVFS, M_WAITOK); 204 bcopy(pdev->si_name, de->de_symlink, j); 205 } else { 206 de->de_inode = i; 207 de->de_uid = dev->si_uid; 208 de->de_gid = dev->si_gid; 209 de->de_mode = dev->si_mode; 210 de->de_dirent->d_type = DT_CHR; 211 } 212 dm->dm_dirent[i] = de; 213 de->de_dir = dd; 214 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 215#if 0 216 printf("Add ino%d %s\n", i, dev->si_name); 217#endif 218 } 219 } 220 return (0); 221} 222 223dev_t devfs_inot[NDEVINO]; 224int devfs_nino = 3; 225unsigned devfs_generation; 226 227static void 228devfs_create(dev_t dev) 229{ 230 if (dev->si_inode == 0 && devfs_nino < NDEVINO) 231 dev->si_inode = devfs_nino++; 232 if (dev->si_inode == 0) { 233 printf("NDEVINO too small\n"); 234 return; 235 } 236 devfs_inot[dev->si_inode] = dev; 237 devfs_generation++; 238} 239 240static void 241devfs_remove(dev_t dev) 242{ 243 devfs_inot[dev->si_inode] = NULL; 244 devfs_generation++; 245} 246 247devfs_create_t *devfs_create_hook = devfs_create; 248devfs_remove_t *devfs_remove_hook = devfs_remove; 249 250int 251devfs_stdclone(char *name, char **namep, char *stem, int *unit) 252{ 253 int u, i; 254 255 if (bcmp(stem, name, strlen(stem)) != 0) 256 return (0); 257 i = strlen(stem); 258 if (!isdigit(name[i])) 259 return (0); 260 u = 0; 261 while (isdigit(name[i])) { 262 u *= 10; 263 u += name[i++] - '0'; 264 } 265 *unit = u; 266 if (namep) 267 *namep = &name[i]; 268 if (name[i]) 269 return (2); 270 return (1); 271} 272