1 /* $FreeBSD: src/sys/msdosfs/denode.h,v 1.20 1999/12/29 04:54:52 peter Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/denode.h,v 1.11 2006/05/06 02:43:14 dillon Exp $ */ 3 /* $NetBSD: denode.h,v 1.25 1997/11/17 15:36:28 ws Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 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 denode *de_next; /* Hash chain forward */ 140 struct vnode *de_vnode; /* addr of vnode we are part of */ 141 struct vnode *de_devvp; /* vnode of blk dev we live on */ 142 u_long de_flag; /* flag bits */ 143 dev_t de_dev; /* device where direntry lives */ 144 u_long de_dirclust; /* cluster of the directory file containing this entry */ 145 u_long de_diroffset; /* offset of this entry in the directory cluster */ 146 u_long de_fndoffset; /* offset of found dir entry */ 147 int de_fndcnt; /* number of slots before de_fndoffset */ 148 long de_refcnt; /* reference count */ 149 struct msdosfsmount *de_pmp; /* addr of our mount struct */ 150 u_char de_Name[12]; /* name, from DOS directory entry */ 151 u_char de_Attributes; /* attributes, from directory entry */ 152 u_char de_LowerCase; /* NT VFAT lower case flags */ 153 u_char de_CHun; /* Hundredth of second of CTime*/ 154 u_short de_CTime; /* creation time */ 155 u_short de_CDate; /* creation date */ 156 u_short de_ADate; /* access date */ 157 u_short de_MTime; /* modification time */ 158 u_short de_MDate; /* modification date */ 159 u_long de_StartCluster; /* starting cluster of file */ 160 u_long de_FileSize; /* size of file in bytes */ 161 struct fatcache de_fc[FC_SIZE]; /* fat cache */ 162 u_quad_t de_modrev; /* Revision level for lease. */ 163 }; 164 165 /* 166 * Values for the de_flag field of the denode. 167 */ 168 #define DE_UPDATE 0x0004 /* Modification time update request */ 169 #define DE_CREATE 0x0008 /* Creation time update */ 170 #define DE_ACCESS 0x0010 /* Access time update */ 171 #define DE_MODIFIED 0x0020 /* Denode has been modified */ 172 #define DE_RENAME 0x0040 /* Denode is in the process of being renamed */ 173 174 175 /* 176 * Transfer directory entries between internal and external form. 177 * dep is a struct denode * (internal form), 178 * dp is a struct direntry * (external form). 179 */ 180 #define DE_INTERNALIZE32(dep, dp) \ 181 ((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16) 182 #define DE_INTERNALIZE(dep, dp) \ 183 (bcopy((dp)->deName, (dep)->de_Name, 11), \ 184 (dep)->de_Attributes = (dp)->deAttributes, \ 185 (dep)->de_LowerCase = (dp)->deLowerCase, \ 186 (dep)->de_CHun = (dp)->deCHundredth, \ 187 (dep)->de_CTime = getushort((dp)->deCTime), \ 188 (dep)->de_CDate = getushort((dp)->deCDate), \ 189 (dep)->de_ADate = getushort((dp)->deADate), \ 190 (dep)->de_MTime = getushort((dp)->deMTime), \ 191 (dep)->de_MDate = getushort((dp)->deMDate), \ 192 (dep)->de_StartCluster = getushort((dp)->deStartCluster), \ 193 (dep)->de_FileSize = getulong((dp)->deFileSize), \ 194 (FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0)) 195 196 #define DE_EXTERNALIZE(dp, dep) \ 197 (bcopy((dep)->de_Name, (dp)->deName, 11), \ 198 (dp)->deAttributes = (dep)->de_Attributes, \ 199 (dp)->deLowerCase = (dep)->de_LowerCase, \ 200 (dp)->deCHundredth = (dep)->de_CHun, \ 201 putushort((dp)->deCTime, (dep)->de_CTime), \ 202 putushort((dp)->deCDate, (dep)->de_CDate), \ 203 putushort((dp)->deADate, (dep)->de_ADate), \ 204 putushort((dp)->deMTime, (dep)->de_MTime), \ 205 putushort((dp)->deMDate, (dep)->de_MDate), \ 206 putushort((dp)->deStartCluster, (dep)->de_StartCluster), \ 207 putulong((dp)->deFileSize, \ 208 ((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \ 209 putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16)) 210 211 #define de_forw de_chain[0] 212 #define de_back de_chain[1] 213 214 #ifdef _KERNEL 215 216 #define VTODE(vp) ((struct denode *)(vp)->v_data) 217 #define DETOV(de) ((de)->de_vnode) 218 219 #define DETIMES(dep, acc, mod, cre) do { \ 220 if ((dep)->de_flag & DE_UPDATE) { \ 221 (dep)->de_flag |= DE_MODIFIED; \ 222 unix2dostime((mod), &(dep)->de_MDate, &(dep)->de_MTime, \ 223 NULL); \ 224 (dep)->de_Attributes |= ATTR_ARCHIVE; \ 225 } \ 226 if ((dep)->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) { \ 227 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \ 228 break; \ 229 } \ 230 if ((dep)->de_flag & DE_ACCESS) { \ 231 u_int16_t adate; \ 232 \ 233 unix2dostime((acc), &adate, NULL, NULL); \ 234 if (adate != (dep)->de_ADate) { \ 235 (dep)->de_flag |= DE_MODIFIED; \ 236 (dep)->de_ADate = adate; \ 237 } \ 238 } \ 239 if ((dep)->de_flag & DE_CREATE) { \ 240 unix2dostime((cre), &(dep)->de_CDate, &(dep)->de_CTime, \ 241 &(dep)->de_CHun); \ 242 (dep)->de_flag |= DE_MODIFIED; \ 243 } \ 244 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \ 245 } while (0); 246 247 /* 248 * This overlays the fid structure (see mount.h) 249 */ 250 struct defid { 251 u_short defid_len; /* length of structure */ 252 u_short defid_pad; /* force long alignment */ 253 254 u_long defid_dirclust; /* cluster this dir entry came from */ 255 u_long defid_dirofs; /* offset of entry within the cluster */ 256 #if 0 257 u_long defid_gen; /* generation number */ 258 #endif 259 }; 260 261 int msdosfs_lookup (struct vop_old_lookup_args *); 262 int msdosfs_inactive (struct vop_inactive_args *); 263 int msdosfs_reclaim (struct vop_reclaim_args *); 264 265 /* 266 * Internal service routine prototypes. 267 */ 268 int deget (struct msdosfsmount *, u_long, u_long, struct denode **); 269 int uniqdosname (struct denode *, struct componentname *, u_char *); 270 int findwin95 (struct denode *); 271 272 int readep (struct msdosfsmount *pmp, u_long dirclu, u_long dirofs, struct buf **bpp, struct direntry **epp); 273 int readde (struct denode *dep, struct buf **bpp, struct direntry **epp); 274 int deextend (struct denode *dep, u_long length); 275 int fillinusemap (struct msdosfsmount *pmp); 276 void msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset); 277 int dosdirempty (struct denode *dep); 278 int createde (struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp); 279 int deupdat (struct denode *dep, int waitfor); 280 int removede (struct denode *pdep, struct denode *dep); 281 int detrunc (struct denode *dep, u_long length, int flags); 282 int doscheckpath ( struct denode *source, struct denode *target); 283 #endif /* _KERNEL */ 284