1 /* $NetBSD: denode.h,v 1.8 2005/09/12 16:24:41 christos Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <miscfs/genfs/genfs_node.h> 51 52 /* 53 * This is the pc filesystem specific portion of the vnode structure. 54 * 55 * To describe a file uniquely the de_dirclust, de_diroffset, and 56 * de_StartCluster fields are used. 57 * 58 * de_dirclust contains the cluster number of the directory cluster 59 * containing the entry for a file or directory. 60 * de_diroffset is the index into the cluster for the entry describing 61 * a file or directory. 62 * de_StartCluster is the number of the first cluster of the file or directory. 63 * 64 * Now to describe the quirks of the pc filesystem. 65 * - Clusters 0 and 1 are reserved. 66 * - The first allocatable cluster is 2. 67 * - The root directory is of fixed size and all blocks that make it up 68 * are contiguous. 69 * - Cluster 0 refers to the root directory when it is found in the 70 * startcluster field of a directory entry that points to another directory. 71 * - Cluster 0 implies a 0 length file when found in the start cluster field 72 * of a directory entry that points to a file. 73 * - You can't use the cluster number 0 to derive the address of the root 74 * directory. 75 * - Multiple directory entries can point to a directory. The entry in the 76 * parent directory points to a child directory. Any directories in the 77 * child directory contain a ".." entry that points back to the parent. 78 * The child directory itself contains a "." entry that points to itself. 79 * - The root directory does not contain a "." or ".." entry. 80 * - Directory entries for directories are never changed once they are created 81 * (except when removed). The size stays 0, and the last modification time 82 * is never changed. This is because so many directory entries can point to 83 * the physical clusters that make up a directory. It would lead to an 84 * update nightmare. 85 * - The length field in a directory entry pointing to a directory contains 0 86 * (always). The only way to find the end of a directory is to follow the 87 * cluster chain until the "last cluster" marker is found. 88 * 89 * My extensions to make this house of cards work. These apply only to the in 90 * memory copy of the directory entry. 91 * - A reference count for each denode will be kept since dos doesn't keep such 92 * things. 93 */ 94 95 /* 96 * Internal pseudo-offset for (nonexistent) directory entry for the root 97 * dir in the root dir 98 */ 99 #define MSDOSFSROOT_OFS 0x1fffffff 100 101 /* 102 * The fat cache structure. fc_fsrcn is the filesystem relative cluster 103 * number that corresponds to the file relative cluster number in this 104 * structure (fc_frcn). 105 */ 106 struct fatcache { 107 u_long fc_frcn; /* file relative cluster number */ 108 u_long fc_fsrcn; /* filesystem relative cluster number */ 109 }; 110 111 /* 112 * The fat entry cache as it stands helps make extending files a "quick" 113 * operation by avoiding having to scan the fat to discover the last 114 * cluster of the file. The cache also helps sequential reads by 115 * remembering the last cluster read from the file. This also prevents us 116 * from having to rescan the fat to find the next cluster to read. This 117 * cache is probably pretty worthless if a file is opened by multiple 118 * processes. 119 */ 120 #define FC_SIZE 2 /* number of entries in the cache */ 121 #define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved 122 * to */ 123 #define FC_LASTFC 1 /* entry for the last cluster in the file */ 124 125 #define FCE_EMPTY 0xffffffff /* doesn't represent an actual cluster # */ 126 127 /* 128 * Set a slot in the fat cache. 129 */ 130 #define fc_setcache(dep, slot, frcn, fsrcn) \ 131 (dep)->de_fc[slot].fc_frcn = frcn; \ 132 (dep)->de_fc[slot].fc_fsrcn = fsrcn; 133 134 /* 135 * This is the in memory variant of a dos directory entry. It is usually 136 * contained within a vnode. 137 */ 138 struct denode { 139 struct genfs_node de_gnode; 140 LIST_ENTRY(denode) de_hash; 141 struct vnode *de_vnode; /* addr of vnode we are part of */ 142 struct vnode *de_devvp; /* vnode of blk dev we live on */ 143 u_long de_flag; /* flag bits */ 144 dev_t de_dev; /* device where direntry lives */ 145 u_long de_dirclust; /* cluster of the directory file containing this entry */ 146 u_long de_diroffset; /* offset of this entry in the directory cluster */ 147 u_long de_fndoffset; /* offset of found dir entry */ 148 int de_fndcnt; /* number of slots before de_fndoffset */ 149 long de_refcnt; /* reference count */ 150 struct msdosfsmount *de_pmp; /* addr of our mount struct */ 151 struct lockf *de_lockf; /* byte level lock list */ 152 u_char de_Name[12]; /* name, from DOS directory entry */ 153 u_char de_Attributes; /* attributes, from directory entry */ 154 u_char de_CHun; /* Hundredth of second of CTime*/ 155 u_short de_CTime; /* creation time */ 156 u_short de_CDate; /* creation date */ 157 u_short de_ADate; /* access date */ 158 u_short de_MTime; /* modification time */ 159 u_short de_MDate; /* modification date */ 160 u_long de_StartCluster; /* starting cluster of file */ 161 u_long de_FileSize; /* size of file in bytes */ 162 struct fatcache de_fc[FC_SIZE]; /* fat cache */ 163 }; 164 165 /* 166 * Values for the de_flag field of the denode. 167 */ 168 #define DE_UPDATE 0x0001 /* Modification time update request. */ 169 #define DE_CREATE 0x0002 /* Creation time update */ 170 #define DE_ACCESS 0x0004 /* Access time update */ 171 #define DE_MODIFIED 0x0008 /* Denode has been modified. */ 172 #define DE_RENAME 0x0010 /* Denode is in the process of being renamed */ 173 174 /* 175 * Maximum filename length in Win95 176 * Note: Must be < sizeof(dirent.d_name) 177 */ 178 #define WIN_MAXLEN 255 179 180 /* Maximum size of a file on a FAT filesystem */ 181 #define MSDOSFS_FILESIZE_MAX 0xFFFFFFFFLL 182 183 /* 184 * Transfer directory entries between internal and external form. 185 * dep is a struct denode * (internal form), 186 * dp is a struct direntry * (external form). 187 */ 188 #define DE_INTERNALIZE32(dep, dp) \ 189 ((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16) 190 #define DE_INTERNALIZE(dep, dp) \ 191 (memcpy((dep)->de_Name, (dp)->deName, 11), \ 192 (dep)->de_Attributes = (dp)->deAttributes, \ 193 (dep)->de_CHun = (dp)->deCHundredth, \ 194 (dep)->de_CTime = getushort((dp)->deCTime), \ 195 (dep)->de_CDate = getushort((dp)->deCDate), \ 196 (dep)->de_ADate = getushort((dp)->deADate), \ 197 (dep)->de_MTime = getushort((dp)->deMTime), \ 198 (dep)->de_MDate = getushort((dp)->deMDate), \ 199 (dep)->de_StartCluster = getushort((dp)->deStartCluster), \ 200 (dep)->de_FileSize = getulong((dp)->deFileSize), \ 201 (FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0)) 202 203 #define DE_EXTERNALIZE32(dp, dep) \ 204 putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16) 205 #define DE_EXTERNALIZE(dp, dep) \ 206 (memcpy((dp)->deName, (dep)->de_Name, 11), \ 207 (dp)->deAttributes = (dep)->de_Attributes, \ 208 (dp)->deCHundredth = (dep)->de_CHun, \ 209 putushort((dp)->deCTime, (dep)->de_CTime), \ 210 putushort((dp)->deCDate, (dep)->de_CDate), \ 211 putushort((dp)->deADate, (dep)->de_ADate), \ 212 putushort((dp)->deMTime, (dep)->de_MTime), \ 213 putushort((dp)->deMDate, (dep)->de_MDate), \ 214 putushort((dp)->deStartCluster, (dep)->de_StartCluster), \ 215 putulong((dp)->deFileSize, \ 216 ((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \ 217 (FAT32((dep)->de_pmp) ? DE_EXTERNALIZE32((dp), (dep)) : 0)) 218 219 #define de_forw de_chain[0] 220 #define de_back de_chain[1] 221 222 #ifdef _KERNEL 223 224 #define VTODE(vp) ((struct denode *)(vp)->v_data) 225 #define DETOV(de) ((de)->de_vnode) 226 227 #define DETIMES(dep, acc, mod, cre, gmtoff) \ 228 while ((dep)->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)) \ 229 msdosfs_detimes(dep, acc, mod, cre, gmtoff) 230 231 /* 232 * This overlays the fid structure (see mount.h) 233 */ 234 struct defid { 235 u_int16_t defid_len; /* length of structure */ 236 u_int16_t defid_pad; /* force 4-byte alignment */ 237 238 u_int32_t defid_dirclust; /* cluster this dir entry came from */ 239 u_int32_t defid_dirofs; /* offset of entry within the cluster */ 240 #if 0 241 u_int32_t defid_gen; /* generation number */ 242 #endif 243 }; 244 245 /* 246 * Prototypes for MSDOSFS vnode operations 247 */ 248 int msdosfs_lookup (void *); 249 int msdosfs_create (void *); 250 int msdosfs_mknod (void *); 251 int msdosfs_open (void *); 252 int msdosfs_close (void *); 253 int msdosfs_access (void *); 254 int msdosfs_getattr (void *); 255 int msdosfs_setattr (void *); 256 int msdosfs_read (void *); 257 int msdosfs_write (void *); 258 #define msdosfs_lease_check genfs_lease_check 259 #define msdosfs_ioctl genfs_enoioctl 260 #define msdosfs_poll genfs_poll 261 #define msdosfs_revoke genfs_revoke 262 #define msdosfs_mmap genfs_mmap 263 #define msdosfs_fsync genfs_fsync 264 #define msdosfs_seek genfs_seek 265 int msdosfs_remove (void *); 266 int msdosfs_link (void *); 267 int msdosfs_rename (void *); 268 int msdosfs_mkdir (void *); 269 int msdosfs_rmdir (void *); 270 int msdosfs_symlink (void *); 271 int msdosfs_readdir (void *); 272 int msdosfs_readlink (void *); 273 #define msdosfs_abortop genfs_abortop 274 int msdosfs_inactive (void *); 275 int msdosfs_reclaim (void *); 276 int msdosfs_bmap (void *); 277 int msdosfs_strategy (void *); 278 int msdosfs_print (void *); 279 int msdosfs_advlock (void *); 280 int msdosfs_reallocblks (void *); 281 int msdosfs_pathconf (void *); 282 int msdosfs_update (void *); 283 284 /* 285 * Internal service routine prototypes. 286 */ 287 int createde(struct denode *, struct denode *, 288 struct denode **, struct componentname *); 289 int deextend(struct denode *, u_long, struct ucred *); 290 int deget(struct msdosfsmount *, u_long, u_long, struct denode **); 291 int detrunc(struct denode *, u_long, int, struct ucred *, struct proc *); 292 int deupdat(struct denode *, int); 293 int doscheckpath(struct denode *, struct denode *); 294 int dosdirempty(struct denode *); 295 int readde(struct denode *, struct buf **, struct direntry **); 296 int readep(struct msdosfsmount *, u_long, u_long, 297 struct buf **, struct direntry **); 298 void reinsert(struct denode *); 299 int removede(struct denode *, struct denode *); 300 int uniqdosname(struct denode *, struct componentname *, u_char *); 301 int findwin95(struct denode *); 302 int msdosfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *); 303 void msdosfs_gop_markupdate(struct vnode *, int); 304 void msdosfs_detimes(struct denode *, const struct timespec *, 305 const struct timespec *, const struct timespec *, int); 306 #endif /* _KERNEL */ 307