proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / msdosfs / denode.h
CommitLineData
984263bc 1/* $FreeBSD: src/sys/msdosfs/denode.h,v 1.20 1999/12/29 04:54:52 peter Exp $ */
dadab5e9 2/* $DragonFly: src/sys/vfs/msdosfs/denode.h,v 1.3 2003/06/25 03:56:01 dillon Exp $ */
984263bc
MD
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 */
106struct 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 */
138struct denode {
139 struct lock de_lock; /* denode lock >Keep this first< */
140 struct denode *de_next; /* Hash chain forward */
141 struct denode **de_prev; /* Hash chain back */
142 struct vnode *de_vnode; /* addr of vnode we are part of */
143 struct vnode *de_devvp; /* vnode of blk dev we live on */
144 u_long de_flag; /* flag bits */
145 dev_t de_dev; /* device where direntry lives */
146 u_long de_dirclust; /* cluster of the directory file containing this entry */
147 u_long de_diroffset; /* offset of this entry in the directory cluster */
148 u_long de_fndoffset; /* offset of found dir entry */
149 int de_fndcnt; /* number of slots before de_fndoffset */
150 long de_refcnt; /* reference count */
151 struct msdosfsmount *de_pmp; /* addr of our mount struct */
152 u_char de_Name[12]; /* name, from DOS directory entry */
153 u_char de_Attributes; /* attributes, from directory entry */
154 u_char de_LowerCase; /* NT VFAT lower case flags */
155 u_char de_CHun; /* Hundredth of second of CTime*/
156 u_short de_CTime; /* creation time */
157 u_short de_CDate; /* creation date */
158 u_short de_ADate; /* access date */
159 u_short de_MTime; /* modification time */
160 u_short de_MDate; /* modification date */
161 u_long de_StartCluster; /* starting cluster of file */
162 u_long de_FileSize; /* size of file in bytes */
163 struct fatcache de_fc[FC_SIZE]; /* fat cache */
164 u_quad_t de_modrev; /* Revision level for lease. */
165};
166
167/*
168 * Values for the de_flag field of the denode.
169 */
170#define DE_UPDATE 0x0004 /* Modification time update request */
171#define DE_CREATE 0x0008 /* Creation time update */
172#define DE_ACCESS 0x0010 /* Access time update */
173#define DE_MODIFIED 0x0020 /* Denode has been modified */
174#define DE_RENAME 0x0040 /* Denode is in the process of being renamed */
175
176
177/*
178 * Transfer directory entries between internal and external form.
179 * dep is a struct denode * (internal form),
180 * dp is a struct direntry * (external form).
181 */
182#define DE_INTERNALIZE32(dep, dp) \
183 ((dep)->de_StartCluster |= getushort((dp)->deHighClust) << 16)
184#define DE_INTERNALIZE(dep, dp) \
185 (bcopy((dp)->deName, (dep)->de_Name, 11), \
186 (dep)->de_Attributes = (dp)->deAttributes, \
187 (dep)->de_LowerCase = (dp)->deLowerCase, \
188 (dep)->de_CHun = (dp)->deCHundredth, \
189 (dep)->de_CTime = getushort((dp)->deCTime), \
190 (dep)->de_CDate = getushort((dp)->deCDate), \
191 (dep)->de_ADate = getushort((dp)->deADate), \
192 (dep)->de_MTime = getushort((dp)->deMTime), \
193 (dep)->de_MDate = getushort((dp)->deMDate), \
194 (dep)->de_StartCluster = getushort((dp)->deStartCluster), \
195 (dep)->de_FileSize = getulong((dp)->deFileSize), \
196 (FAT32((dep)->de_pmp) ? DE_INTERNALIZE32((dep), (dp)) : 0))
197
198#define DE_EXTERNALIZE(dp, dep) \
199 (bcopy((dep)->de_Name, (dp)->deName, 11), \
200 (dp)->deAttributes = (dep)->de_Attributes, \
201 (dp)->deLowerCase = (dep)->de_LowerCase, \
202 (dp)->deCHundredth = (dep)->de_CHun, \
203 putushort((dp)->deCTime, (dep)->de_CTime), \
204 putushort((dp)->deCDate, (dep)->de_CDate), \
205 putushort((dp)->deADate, (dep)->de_ADate), \
206 putushort((dp)->deMTime, (dep)->de_MTime), \
207 putushort((dp)->deMDate, (dep)->de_MDate), \
208 putushort((dp)->deStartCluster, (dep)->de_StartCluster), \
209 putulong((dp)->deFileSize, \
210 ((dep)->de_Attributes & ATTR_DIRECTORY) ? 0 : (dep)->de_FileSize), \
211 putushort((dp)->deHighClust, (dep)->de_StartCluster >> 16))
212
213#define de_forw de_chain[0]
214#define de_back de_chain[1]
215
216#ifdef _KERNEL
217
218#define VTODE(vp) ((struct denode *)(vp)->v_data)
219#define DETOV(de) ((de)->de_vnode)
220
221#define DETIMES(dep, acc, mod, cre) do { \
222 if ((dep)->de_flag & DE_UPDATE) { \
223 (dep)->de_flag |= DE_MODIFIED; \
224 unix2dostime((mod), &(dep)->de_MDate, &(dep)->de_MTime, \
225 NULL); \
226 (dep)->de_Attributes |= ATTR_ARCHIVE; \
227 } \
228 if ((dep)->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) { \
229 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \
230 break; \
231 } \
232 if ((dep)->de_flag & DE_ACCESS) { \
233 u_int16_t adate; \
234 \
235 unix2dostime((acc), &adate, NULL, NULL); \
236 if (adate != (dep)->de_ADate) { \
237 (dep)->de_flag |= DE_MODIFIED; \
238 (dep)->de_ADate = adate; \
239 } \
240 } \
241 if ((dep)->de_flag & DE_CREATE) { \
242 unix2dostime((cre), &(dep)->de_CDate, &(dep)->de_CTime, \
243 &(dep)->de_CHun); \
244 (dep)->de_flag |= DE_MODIFIED; \
245 } \
246 (dep)->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); \
247} while (0);
248
249/*
250 * This overlays the fid structure (see mount.h)
251 */
252struct defid {
253 u_short defid_len; /* length of structure */
254 u_short defid_pad; /* force long alignment */
255
256 u_long defid_dirclust; /* cluster this dir entry came from */
257 u_long defid_dirofs; /* offset of entry within the cluster */
258#if 0
259 u_long defid_gen; /* generation number */
260#endif
261};
262
263extern vop_t **msdosfs_vnodeop_p;
264
265int msdosfs_lookup __P((struct vop_cachedlookup_args *));
266int msdosfs_inactive __P((struct vop_inactive_args *));
267int msdosfs_reclaim __P((struct vop_reclaim_args *));
268
269/*
270 * Internal service routine prototypes.
271 */
272int deget __P((struct msdosfsmount *, u_long, u_long, struct denode **));
273int uniqdosname __P((struct denode *, struct componentname *, u_char *));
274int findwin95 __P((struct denode *));
275
276int readep __P((struct msdosfsmount *pmp, u_long dirclu, u_long dirofs, struct buf **bpp, struct direntry **epp));
277int readde __P((struct denode *dep, struct buf **bpp, struct direntry **epp));
278int deextend __P((struct denode *dep, u_long length, struct ucred *cred));
279int fillinusemap __P((struct msdosfsmount *pmp));
280void reinsert __P((struct denode *dep));
281int dosdirempty __P((struct denode *dep));
282int createde __P((struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp));
283int deupdat __P((struct denode *dep, int waitfor));
284int removede __P((struct denode *pdep, struct denode *dep));
dadab5e9 285int detrunc __P((struct denode *dep, u_long length, int flags, struct ucred *cred, struct thread *td));
984263bc
MD
286int doscheckpath __P(( struct denode *source, struct denode *target));
287#endif /* _KERNEL */