1 /* $FreeBSD$ */ 2 /* $NetBSD: denode.h,v 1.25 1997/11/17 15:36:28 ws 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 51 /* 52 * This is the pc filesystem specific portion of the vnode structure. 53 * 54 * To describe a file uniquely the de_dirclust, de_diroffset, and 55 * de_StartCluster fields are used. 56 * 57 * de_dirclust contains the cluster number of the directory cluster 58 * containing the entry for a file or directory. 59 * de_diroffset is the index into the cluster for the entry describing 60 * a file or directory. 61 * de_StartCluster is the number of the first cluster of the file or directory. 62 * 63 * Now to describe the quirks of the pc filesystem. 64 * - Clusters 0 and 1 are reserved. 65 * - The first allocatable cluster is 2. 66 * - The root directory is of fixed size and all blocks that make it up 67 * are contiguous. 68 * - Cluster 0 refers to the root directory when it is found in the 69 * startcluster field of a directory entry that points to another directory. 70 * - Cluster 0 implies a 0 length file when found in the start cluster field 71 * of a directory entry that points to a file. 72 * - You can't use the cluster number 0 to derive the address of the root 73 * directory. 74 * - Multiple directory entries can point to a directory. The entry in the 75 * parent directory points to a child directory. Any directories in the 76 * child directory contain a ".." entry that points back to the parent. 77 * The child directory itself contains a "." entry that points to itself. 78 * - The root directory does not contain a "." or ".." entry. 79 * - Directory entries for directories are never changed once they are created 80 * (except when removed). The size stays 0, and the last modification time 81 * is never changed. This is because so many directory entries can point to 82 * the physical clusters that make up a directory. It would lead to an 83 * update nightmare. 84 * - The length field in a directory entry pointing to a directory contains 0 85 * (always). The only way to find the end of a directory is to follow the 86 * cluster chain until the "last cluster" marker is found. 87 * 88 * My extensions to make this house of cards work. These apply only to the in 89 * memory copy of the directory entry. 90 * - A reference count for each denode will be kept since dos doesn't keep such 91 * things. 92 */ 93 94 /* 95 * Internal pseudo-offset for (nonexistent) directory entry for the root 96 * dir in the root dir 97 */ 98 #define MSDOSFSROOT_OFS 0x1fffffff 99 100 /* 101 * The fat cache structure. fc_fsrcn is the filesystem relative cluster 102 * number that corresponds to the file relative cluster number in this 103 * structure (fc_frcn). 104 */ 105 struct fatcache { 106 u_long fc_frcn; /* file relative cluster number */ 107 u_long fc_fsrcn; /* filesystem relative cluster number */ 108 }; 109 110 /* 111 * The fat entry cache as it stands helps make extending files a "quick" 112 * operation by avoiding having to scan the fat to discover the last 113 * cluster of the file. The cache also helps sequential reads by 114 * remembering the last cluster read from the file. This also prevents us 115 * from having to rescan the fat to find the next cluster to read. This 116 * cache is probably pretty worthless if a file is opened by multiple 117 * processes. 118 */ 119 #define FC_SIZE 2 /* number of entries in the cache */ 120 #define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved 121 * to */ 122 #define FC_LASTFC 1 /* entry for the last cluster in the file */ 123 124 #define FCE_EMPTY 0xffffffff /* doesn't represent an actual cluster # */ 125 126 /* 127 * Set a slot in the fat cache. 128 */ 129 #define fc_setcache(dep, slot, frcn, fsrcn) \ 130 (dep)->de_fc[(slot)].fc_frcn = (frcn); \ 131 (dep)->de_fc[(slot)].fc_fsrcn = (fsrcn); 132 133 /* 134 * This is the in memory variant of a dos directory entry. It is usually 135 * contained within a vnode. 136 */ 137 struct denode { 138 struct denode *de_next; /* Hash chain forward */ 139 struct denode **de_prev; /* Hash chain back */ 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 struct cdev *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 struct lockf *de_lockf; /* lockf */ 164 }; 165 166 /* 167 * Values for the de_flag field of the denode. 168 */ 169 #define DE_UPDATE 0x0004 /* Modification time update request */ 170 #define DE_CREATE 0x0008 /* Creation time update */ 171 #define DE_ACCESS 0x0010 /* Access time update */ 172 #define DE_MODIFIED 0x0020 /* Denode has been modified */ 173 #define DE_RENAME 0x0040 /* Denode is in the process of being renamed */ 174 175 176 /* 177 * Transfer directory entries between internal and external form. 178 * dep is a struct denode * (internal form), 179 * dp is a struct direntry * (external form). 180 */ 181 #define DE_INTERNALIZE32(dep, dp) \ 182 ((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16) 183 #define DE_INTERNALIZE(dep, dp) \ 184 (bcopy((dp)->deName, (dep)->de_Name, 11), \ 185 (dep)->de_Attributes = (dp)->deAttributes, \ 186 (dep)->de_LowerCase = (dp)->deLowerCase, \ 187 (dep)->de_CHun = (dp)->deCHundredth, \ 188 (dep)->de_CTime = getushort((dp)->deCTime), \ 189 (dep)->de_CDate = getushort((dp)->deCDate), \ 190 (dep)->de_ADate = getushort((dp)->deADate), \ 191 (dep)->de_MTime = getushort((dp)->deMTime), \ 192 (dep)->de_MDate = getushort((dp)->deMDate), \ 193 (dep)->de_StartCluster = getushort((dp)->deStartCluster), \ 194 (dep)->de_FileSize = getulong((dp)->deFileSize), \ 195 (FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0)) 196 197 #define DE_EXTERNALIZE(dp, dep) \ 198 (bcopy((dep)->de_Name, (dp)->deName, 11), \ 199 (dp)->deAttributes = (dep)->de_Attributes, \ 200 (dp)->deLowerCase = (dep)->de_LowerCase, \ 201 (dp)->deCHundredth = (dep)->de_CHun, \ 202 putushort((dp)->deCTime, (dep)->de_CTime), \ 203 putushort((dp)->deCDate, (dep)->de_CDate), \ 204 putushort((dp)->deADate, (dep)->de_ADate), \ 205 putushort((dp)->deMTime, (dep)->de_MTime), \ 206 putushort((dp)->deMDate, (dep)->de_MDate), \ 207 putushort((dp)->deStartCluster, (dep)->de_StartCluster), \ 208 putulong((dp)->deFileSize, \ 209 ((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \ 210 putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16)) 211 212 #define de_forw de_chain[0] 213 #define de_back de_chain[1] 214 215 #ifdef _KERNEL 216 217 #define VTODE(vp) ((struct denode *)(vp)->v_data) 218 #define DETOV(de) ((de)->de_vnode) 219 220 #define DETIMES(dep, acc, mod, cre) do { \ 221 if ((dep)->de_flag & DE_UPDATE) { \ 222 (dep)->de_flag |= DE_MODIFIED; \ 223 unix2dostime((mod), &(dep)->de_MDate, &(dep)->de_MTime, \ 224 NULL); \ 225 (dep)->de_Attributes |= ATTR_ARCHIVE; \ 226 } \ 227 if ((dep)->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) { \ 228 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \ 229 break; \ 230 } \ 231 if ((dep)->de_flag & DE_ACCESS) { \ 232 u_int16_t adate; \ 233 \ 234 unix2dostime((acc), &adate, NULL, NULL); \ 235 if (adate != (dep)->de_ADate) { \ 236 (dep)->de_flag |= DE_MODIFIED; \ 237 (dep)->de_ADate = adate; \ 238 } \ 239 } \ 240 if ((dep)->de_flag & DE_CREATE) { \ 241 unix2dostime((cre), &(dep)->de_CDate, &(dep)->de_CTime, \ 242 &(dep)->de_CHun); \ 243 (dep)->de_flag |= DE_MODIFIED; \ 244 } \ 245 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \ 246 } while (0); 247 248 /* 249 * This overlays the fid structure (see mount.h) 250 */ 251 struct defid { 252 u_short defid_len; /* length of structure */ 253 u_short defid_pad; /* force long alignment */ 254 255 u_long defid_dirclust; /* cluster this dir entry came from */ 256 u_long defid_dirofs; /* offset of entry within the cluster */ 257 #if 0 258 u_long defid_gen; /* generation number */ 259 #endif 260 }; 261 262 extern vop_t **msdosfs_vnodeop_p; 263 264 int msdosfs_lookup(struct vop_cachedlookup_args *); 265 int msdosfs_inactive(struct vop_inactive_args *); 266 int msdosfs_reclaim(struct vop_reclaim_args *); 267 268 /* 269 * Internal service routine prototypes. 270 */ 271 int deget(struct msdosfsmount *, u_long, u_long, struct denode **); 272 int uniqdosname(struct denode *, struct componentname *, u_char *); 273 int findwin95(struct denode *); 274 275 int readep(struct msdosfsmount *pmp, u_long dirclu, u_long dirofs, struct buf **bpp, struct direntry **epp); 276 int readde(struct denode *dep, struct buf **bpp, struct direntry **epp); 277 int deextend(struct denode *dep, u_long length, struct ucred *cred); 278 int fillinusemap(struct msdosfsmount *pmp); 279 void reinsert(struct denode *dep); 280 int dosdirempty(struct denode *dep); 281 int createde(struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp); 282 int deupdat(struct denode *dep, int waitfor); 283 int removede(struct denode *pdep, struct denode *dep); 284 int detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred, struct thread *td); 285 int doscheckpath( struct denode *source, struct denode *target); 286 #endif /* _KERNEL */ 287