1 /* $OpenBSD: denode.h,v 1.2 2016/12/17 16:43:30 krw Exp $ */ 2 /* $NetBSD: denode.h,v 1.24 2014/07/08 09:21:52 hannken Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 #ifndef _MSDOSFS_DENODE_H_ 51 #define _MSDOSFS_DENODE_H_ 52 53 struct genfs_node { 54 }; 55 struct mkfsvnode; 56 struct msdosfsmount; 57 struct mkfsbuf; 58 59 /* 60 * This is the pc filesystem specific portion of the mkfsvnode structure. 61 * 62 * To describe a file uniquely the de_dirclust, de_diroffset, and 63 * de_StartCluster fields are used. 64 * 65 * de_dirclust contains the cluster number of the directory cluster 66 * containing the entry for a file or directory. 67 * de_diroffset is the index into the cluster for the entry describing 68 * a file or directory. 69 * de_StartCluster is the number of the first cluster of the file or directory. 70 * 71 * Now to describe the quirks of the pc filesystem. 72 * - Clusters 0 and 1 are reserved. 73 * - The first allocatable cluster is 2. 74 * - The root directory is of fixed size and all blocks that make it up 75 * are contiguous. 76 * - Cluster 0 refers to the root directory when it is found in the 77 * startcluster field of a directory entry that points to another directory. 78 * - Cluster 0 implies a 0 length file when found in the start cluster field 79 * of a directory entry that points to a file. 80 * - You can't use the cluster number 0 to derive the address of the root 81 * directory. 82 * - Multiple directory entries can point to a directory. The entry in the 83 * parent directory points to a child directory. Any directories in the 84 * child directory contain a ".." entry that points back to the parent. 85 * The child directory itself contains a "." entry that points to itself. 86 * - The root directory does not contain a "." or ".." entry. 87 * - Directory entries for directories are never changed once they are created 88 * (except when removed). The size stays 0, and the last modification time 89 * is never changed. This is because so many directory entries can point to 90 * the physical clusters that make up a directory. It would lead to an 91 * update nightmare. 92 * - The length field in a directory entry pointing to a directory contains 0 93 * (always). The only way to find the end of a directory is to follow the 94 * cluster chain until the "last cluster" marker is found. 95 * 96 * My extensions to make this house of cards work. These apply only to the in 97 * memory copy of the directory entry. 98 * - A reference count for each denode will be kept since dos doesn't keep such 99 * things. 100 */ 101 102 /* 103 * Internal pseudo-offset for (nonexistent) directory entry for the root 104 * dir in the root dir 105 */ 106 #define MSDOSFSROOT_OFS 0x1fffffff 107 108 /* 109 * The FAT cache structure. fc_fsrcn is the filesystem relative cluster 110 * number that corresponds to the file relative cluster number in this 111 * structure (fc_frcn). 112 */ 113 struct fatcache { 114 u_long fc_frcn; /* file relative cluster number */ 115 u_long fc_fsrcn; /* filesystem relative cluster number */ 116 }; 117 118 /* 119 * The FAT entry cache as it stands helps make extending files a "quick" 120 * operation by avoiding having to scan the FAT to discover the last 121 * cluster of the file. The cache also helps sequential reads by 122 * remembering the last cluster read from the file. This also prevents us 123 * from having to rescan the FAT to find the next cluster to read. This 124 * cache is probably pretty worthless if a file is opened by multiple 125 * processes. 126 */ 127 #define FC_SIZE 3 /* number of entries in the cache */ 128 #define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved 129 * to */ 130 #define FC_LASTFC 1 /* entry for the last cluster in the file */ 131 #define FC_NEXTTOLASTFC 2 /* entry for a close to the last cluster in the file */ 132 133 #define FCE_EMPTY 0xffffffff /* doesn't represent an actual cluster # */ 134 135 /* 136 * Set a slot in the FAT cache. 137 */ 138 #define fc_setcache(dep, slot, frcn, fsrcn) \ 139 (dep)->de_fc[slot].fc_frcn = frcn; \ 140 (dep)->de_fc[slot].fc_fsrcn = fsrcn; 141 142 #define fc_last_to_nexttolast(dep) \ 143 do { \ 144 (dep)->de_fc[FC_NEXTTOLASTFC].fc_frcn = (dep)->de_fc[FC_LASTFC].fc_frcn; \ 145 (dep)->de_fc[FC_NEXTTOLASTFC].fc_fsrcn = (dep)->de_fc[FC_LASTFC].fc_fsrcn; \ 146 } while (0) 147 148 149 /* 150 * This is the in memory variant of a dos directory entry. It is usually 151 * contained within a mkfsvnode. 152 */ 153 struct denode_key { 154 u_long dk_dirclust; /* cluster of the directory file containing this entry */ 155 u_long dk_diroffset; /* offset of this entry in the directory cluster */ 156 void *dk_dirgen; /* non zero and unique for unlinked nodes */ 157 }; 158 struct denode { 159 struct genfs_node de_gnode; 160 struct mkfsvnode *de_mkfsvnode; /* addr of mkfsvnode we are part of */ 161 struct mkfsvnode *de_devvp; /* mkfsvnode of blk dev we live on */ 162 u_long de_flag; /* flag bits */ 163 dev_t de_dev; /* device where direntry lives */ 164 struct denode_key de_key; 165 #define de_dirclust de_key.dk_dirclust 166 #define de_diroffset de_key.dk_diroffset 167 #define de_dirgen de_key.dk_dirgen 168 u_long de_fndoffset; /* offset of found dir entry */ 169 int de_fndcnt; /* number of slots before de_fndoffset */ 170 long de_refcnt; /* reference count */ 171 struct msdosfsmount *de_pmp; /* addr of our mount struct */ 172 struct lockf *de_lockf; /* byte level lock list */ 173 u_char de_Name[12]; /* name, from DOS directory entry */ 174 u_char de_Attributes; /* attributes, from directory entry */ 175 u_char de_CHun; /* Hundredth of second of CTime*/ 176 u_short de_CTime; /* creation time */ 177 u_short de_CDate; /* creation date */ 178 u_short de_ADate; /* access date */ 179 u_short de_MTime; /* modification time */ 180 u_short de_MDate; /* modification date */ 181 u_long de_StartCluster; /* starting cluster of file */ 182 u_long de_FileSize; /* size of file in bytes */ 183 struct fatcache de_fc[FC_SIZE]; /* FAT cache */ 184 }; 185 186 /* 187 * Values for the de_flag field of the denode. 188 */ 189 #define DE_UPDATE 0x0001 /* Modification time update request. */ 190 #define DE_CREATE 0x0002 /* Creation time update */ 191 #define DE_ACCESS 0x0004 /* Access time update */ 192 #define DE_MODIFIED 0x0008 /* Denode has been modified. */ 193 #define DE_RENAME 0x0010 /* Denode is in the process of being renamed */ 194 195 /* 196 * Maximum filename length in Win95 197 * Note: Must be < sizeof(dirent.d_name) 198 */ 199 #define WIN_MAXLEN 255 200 201 /* Maximum size of a file on a FAT filesystem */ 202 #define MSDOSFS_FILESIZE_MAX 0xFFFFFFFFLL 203 204 /* 205 * Transfer directory entries between internal and external form. 206 * dep is a struct denode * (internal form), 207 * dp is a struct direntry * (external form). 208 */ 209 #define DE_INTERNALIZE32(dep, dp) \ 210 ((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16) 211 #define DE_INTERNALIZE(dep, dp) \ 212 (memcpy((dep)->de_Name, (dp)->deName, 11), \ 213 (dep)->de_Attributes = (dp)->deAttributes, \ 214 (dep)->de_CHun = (dp)->deCTimeHundredth, \ 215 (dep)->de_CTime = getushort((dp)->deCTime), \ 216 (dep)->de_CDate = getushort((dp)->deCDate), \ 217 (dep)->de_ADate = getushort((dp)->deADate), \ 218 (dep)->de_MTime = getushort((dp)->deMTime), \ 219 (dep)->de_MDate = getushort((dp)->deMDate), \ 220 (dep)->de_StartCluster = getushort((dp)->deStartCluster), \ 221 (dep)->de_FileSize = getulong((dp)->deFileSize), \ 222 (FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0)) 223 224 #define DE_EXTERNALIZE32(dp, dep) \ 225 putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16) 226 #define DE_EXTERNALIZE16(dp, dep) \ 227 putushort((dp)->deHighClust, 0) 228 #define DE_EXTERNALIZE(dp, dep) \ 229 (memcpy((dp)->deName, (dep)->de_Name, 11), \ 230 (dp)->deAttributes = (dep)->de_Attributes, \ 231 (dp)->deCTimeHundredth = (dep)->de_CHun, \ 232 putushort((dp)->deCTime, (dep)->de_CTime), \ 233 putushort((dp)->deCDate, (dep)->de_CDate), \ 234 putushort((dp)->deADate, (dep)->de_ADate), \ 235 putushort((dp)->deMTime, (dep)->de_MTime), \ 236 putushort((dp)->deMDate, (dep)->de_MDate), \ 237 putushort((dp)->deStartCluster, (dep)->de_StartCluster), \ 238 putulong((dp)->deFileSize, \ 239 ((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \ 240 (FAT32((dep)->de_pmp) ? DE_EXTERNALIZE32((dp), (dep)) : DE_EXTERNALIZE16((dp), (dep)))) 241 242 #define de_forw de_chain[0] 243 #define de_back de_chain[1] 244 245 246 #define VTODE(vp) ((struct denode *)(vp)->v_data) 247 #define DETOV(de) ((de)->de_mkfsvnode) 248 249 #define DETIMES(dep, acc, mod, cre, gmtoff) \ 250 while ((dep)->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)) \ 251 msdosfs_detimes(dep, acc, mod, cre, gmtoff) 252 253 /* 254 * This overlays the fid structure (see fstypes.h) 255 */ 256 struct defid { 257 u_int16_t defid_len; /* length of structure */ 258 u_int16_t defid_pad; /* force 4-byte alignment */ 259 260 u_int32_t defid_dirclust; /* cluster this dir entry came from */ 261 u_int32_t defid_dirofs; /* offset of entry within the cluster */ 262 u_int32_t defid_gen; /* generation number */ 263 }; 264 265 /* 266 * Prototypes for MSDOSFS mkfsvnode operations 267 */ 268 int msdosfs_lookup (void *); 269 int msdosfs_create (void *); 270 int msdosfs_close (void *); 271 int msdosfs_access (void *); 272 int msdosfs_getattr (void *); 273 int msdosfs_setattr (void *); 274 int msdosfs_read (void *); 275 int msdosfs_write (void *); 276 #define msdosfs_lease_check genfs_lease_check 277 #define msdosfs_ioctl genfs_enoioctl 278 #define msdosfs_poll genfs_poll 279 #define msdosfs_revoke genfs_revoke 280 #define msdosfs_mmap genfs_mmap 281 int msdosfs_fsync (void *); 282 #define msdosfs_seek genfs_seek 283 int msdosfs_remove (void *); 284 int msdosfs_rename (void *); 285 int msdosfs_mkdir (void *); 286 int msdosfs_rmdir (void *); 287 int msdosfs_readdir (void *); 288 #define msdosfs_abortop genfs_abortop 289 int msdosfs_inactive (void *); 290 int msdosfs_reclaim (void *); 291 int msdosfs_bmap (void *); 292 int msdosfs_strategy (void *); 293 int msdosfs_print (void *); 294 int msdosfs_advlock (void *); 295 int msdosfs_pathconf (void *); 296 297 /* 298 * Internal service routine prototypes. 299 */ 300 struct componentname; 301 struct direntry; 302 int msdosfs_update(struct mkfsvnode *, const struct timespec *, 303 const struct timespec *, int); 304 int createde(struct denode *, struct denode *, 305 struct denode **, struct componentname *); 306 int deextend(struct denode *, u_long); 307 int deget(struct msdosfsmount *, u_long, u_long, struct denode **); 308 int detrunc(struct denode *, u_long, int); 309 int deupdat(struct denode *, int); 310 int readde(struct denode *, struct mkfsbuf **, struct direntry **); 311 int readep(struct msdosfsmount *, u_long, u_long, 312 struct mkfsbuf **, struct direntry **); 313 int uniqdosname(struct denode *, struct componentname *, u_char *); 314 int msdosfs_gop_alloc(struct mkfsvnode *, off_t, off_t, int); 315 void msdosfs_gop_markupdate(struct mkfsvnode *, int); 316 void msdosfs_detimes(struct denode *, const struct timespec *, 317 const struct timespec *, const struct timespec *, int); 318 int msdosfs_fh_enter(struct msdosfsmount *, uint32_t, uint32_t, uint32_t *); 319 int msdosfs_fh_remove(struct msdosfsmount *, uint32_t, uint32_t); 320 int msdosfs_fh_lookup(struct msdosfsmount *, uint32_t, uint32_t, uint32_t *); 321 void msdosfs_fh_destroy(struct msdosfsmount *); 322 #endif /* _MSDOSFS_DENODE_H_ */ 323