File: | msdosfs/msdosfs_vnops.c |
Warning: | line 1360, column 2 Value stored to 'error' is never read |
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1 | /* $OpenBSD: msdosfs_vnops.c,v 1.140 2023/09/08 20:00:28 mvs Exp $ */ |
2 | /* $NetBSD: msdosfs_vnops.c,v 1.63 1997/10/17 11:24:19 ws Exp $ */ |
3 | |
4 | /*- |
5 | * Copyright (C) 2005 Thomas Wang. |
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 | #include <sys/param.h> |
53 | #include <sys/systm.h> |
54 | #include <sys/namei.h> |
55 | #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ |
56 | #include <sys/fcntl.h> /* define FWRITE ... */ |
57 | #include <sys/file.h> |
58 | #include <sys/stat.h> |
59 | #include <sys/buf.h> |
60 | #include <sys/proc.h> |
61 | #include <sys/mount.h> |
62 | #include <sys/vnode.h> |
63 | #include <sys/lock.h> |
64 | #include <sys/signalvar.h> |
65 | #include <sys/specdev.h> /* XXX */ /* defines v_rdev */ |
66 | #include <sys/malloc.h> |
67 | #include <sys/pool.h> |
68 | #include <sys/dirent.h> /* defines dirent structure */ |
69 | #include <sys/lockf.h> |
70 | #include <sys/unistd.h> |
71 | |
72 | #include <msdosfs/bpb.h> |
73 | #include <msdosfs/direntry.h> |
74 | #include <msdosfs/denode.h> |
75 | #include <msdosfs/msdosfsmount.h> |
76 | #include <msdosfs/fat.h> |
77 | |
78 | static uint32_t fileidhash(uint64_t); |
79 | |
80 | int msdosfs_bmaparray(struct vnode *, uint32_t, daddr_t *, int *); |
81 | int msdosfs_kqfilter(void *); |
82 | int filt_msdosfsread(struct knote *, long); |
83 | int filt_msdosfswrite(struct knote *, long); |
84 | int filt_msdosfsvnode(struct knote *, long); |
85 | void filt_msdosfsdetach(struct knote *); |
86 | |
87 | /* |
88 | * Some general notes: |
89 | * |
90 | * In the ufs filesystem the inodes, superblocks, and indirect blocks are |
91 | * read/written using the vnode for the filesystem. Blocks that represent |
92 | * the contents of a file are read/written using the vnode for the file |
93 | * (including directories when they are read/written as files). This |
94 | * presents problems for the dos filesystem because data that should be in |
95 | * an inode (if dos had them) resides in the directory itself. Since we |
96 | * must update directory entries without the benefit of having the vnode |
97 | * for the directory we must use the vnode for the filesystem. This means |
98 | * that when a directory is actually read/written (via read, write, or |
99 | * readdir, or seek) we must use the vnode for the filesystem instead of |
100 | * the vnode for the directory as would happen in ufs. This is to insure we |
101 | * retrieve the correct block from the buffer cache since the hash value is |
102 | * based upon the vnode address and the desired block number. |
103 | */ |
104 | |
105 | /* |
106 | * Create a regular file. On entry the directory to contain the file being |
107 | * created is locked. We must release before we return. We must also free |
108 | * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or |
109 | * only if the SAVESTART bit in cn_flags is clear on success. |
110 | */ |
111 | int |
112 | msdosfs_create(void *v) |
113 | { |
114 | struct vop_create_args *ap = v; |
115 | struct componentname *cnp = ap->a_cnp; |
116 | struct denode ndirent; |
117 | struct denode *dep; |
118 | struct denode *pdep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
119 | int error; |
120 | struct timespec ts; |
121 | |
122 | #ifdef MSDOSFS_DEBUG |
123 | printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); |
124 | #endif |
125 | |
126 | /* |
127 | * If this is the root directory and there is no space left we |
128 | * can't do anything. This is because the root directory can not |
129 | * change size. |
130 | */ |
131 | if (pdep->de_StartCluster == MSDOSFSROOT0 |
132 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
133 | error = ENOSPC28; |
134 | goto bad; |
135 | } |
136 | |
137 | /* |
138 | * Create a directory entry for the file, then call createde() to |
139 | * have it installed. NOTE: DOS files are always executable. We |
140 | * use the absence of the owner write bit to make the file |
141 | * readonly. |
142 | */ |
143 | #ifdef DIAGNOSTIC1 |
144 | if ((cnp->cn_flags & HASBUF0x000400) == 0) |
145 | panic("msdosfs_create: no name"); |
146 | #endif |
147 | bzero(&ndirent, sizeof(ndirent))__builtin_bzero((&ndirent), (sizeof(ndirent))); |
148 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
149 | goto bad; |
150 | |
151 | ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE00200) ? |
152 | ATTR_ARCHIVE0x20 : ATTR_ARCHIVE0x20 | ATTR_READONLY0x01; |
153 | ndirent.de_StartCluster = 0; |
154 | ndirent.de_FileSize = 0; |
155 | ndirent.de_dev = pdep->de_dev; |
156 | ndirent.de_devvp = pdep->de_devvp; |
157 | ndirent.de_pmp = pdep->de_pmp; |
158 | ndirent.de_flag = DE_ACCESS0x0010 | DE_CREATE0x0008 | DE_UPDATE0x0004; |
159 | getnanotime(&ts); |
160 | DETIMES(&ndirent, &ts, &ts, &ts)if ((&ndirent)->de_flag & (0x0004 | 0x0008 | 0x0010 )) { (&ndirent)->de_flag |= 0x0020; if ((&ndirent) ->de_flag & 0x0004) { unix2dostime((&ts), &(& ndirent)->de_MDate, &(&ndirent)->de_MTime, ((void *)0)); (&ndirent)->de_Attributes |= 0x20; } if (!((& ndirent)->de_pmp->pm_flags & 0x04)) { if ((&ndirent )->de_flag & 0x0010) unix2dostime((&ts), &(& ndirent)->de_ADate, ((void *)0), ((void *)0)); if ((&ndirent )->de_flag & 0x0008) unix2dostime((&ts), &(& ndirent)->de_CDate, &(&ndirent)->de_CTime, & (&ndirent)->de_CTimeHundredth); } (&ndirent)->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
161 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
162 | goto bad; |
163 | if ((cnp->cn_flags & SAVESTART0x001000) == 0) |
164 | pool_put(&namei_pool, cnp->cn_pnbuf); |
165 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)knote_locked(&ap->a_dvp->v_klist, (0x0002)); |
166 | *ap->a_vpp = DETOV(dep)((dep)->de_vnode); |
167 | return (0); |
168 | |
169 | bad: |
170 | pool_put(&namei_pool, cnp->cn_pnbuf); |
171 | return (error); |
172 | } |
173 | |
174 | int |
175 | msdosfs_mknod(void *v) |
176 | { |
177 | struct vop_mknod_args *ap = v; |
178 | |
179 | pool_put(&namei_pool, ap->a_cnp->cn_pnbuf); |
180 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)knote_locked(&ap->a_dvp->v_klist, (0x0002)); |
181 | return (EINVAL22); |
182 | } |
183 | |
184 | int |
185 | msdosfs_open(void *v) |
186 | { |
187 | return (0); |
188 | } |
189 | |
190 | int |
191 | msdosfs_close(void *v) |
192 | { |
193 | struct vop_close_args *ap = v; |
194 | struct vnode *vp = ap->a_vp; |
195 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
196 | struct timespec ts; |
197 | |
198 | if (vp->v_usecount > 1 && !VOP_ISLOCKED(vp)) { |
199 | getnanotime(&ts); |
200 | DETIMES(dep, &ts, &ts, &ts)if ((dep)->de_flag & (0x0004 | 0x0008 | 0x0010)) { (dep )->de_flag |= 0x0020; if ((dep)->de_flag & 0x0004) { unix2dostime((&ts), &(dep)->de_MDate, &(dep)-> de_MTime, ((void *)0)); (dep)->de_Attributes |= 0x20; } if (!((dep)->de_pmp->pm_flags & 0x04)) { if ((dep)-> de_flag & 0x0010) unix2dostime((&ts), &(dep)-> de_ADate, ((void *)0), ((void *)0)); if ((dep)->de_flag & 0x0008) unix2dostime((&ts), &(dep)->de_CDate, & (dep)->de_CTime, &(dep)->de_CTimeHundredth); } (dep )->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
201 | } |
202 | return (0); |
203 | } |
204 | |
205 | int |
206 | msdosfs_access(void *v) |
207 | { |
208 | struct vop_access_args *ap = v; |
209 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
210 | struct msdosfsmount *pmp = dep->de_pmp; |
211 | mode_t dosmode; |
212 | |
213 | dosmode = (S_IRUSR0000400 | S_IRGRP0000040 | S_IROTH0000004); |
214 | if ((dep->de_Attributes & ATTR_READONLY0x01) == 0) |
215 | dosmode |= (S_IWUSR0000200 | S_IWGRP0000020 | S_IWOTH0000002); |
216 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
217 | dosmode |= (S_IXUSR0000100 | S_IXGRP0000010 | S_IXOTH0000001); |
218 | dosmode &= pmp->pm_mask; |
219 | |
220 | return (vaccess(ap->a_vp->v_type, dosmode, pmp->pm_uid, pmp->pm_gid, |
221 | ap->a_mode, ap->a_cred)); |
222 | } |
223 | |
224 | int |
225 | msdosfs_getattr(void *v) |
226 | { |
227 | struct vop_getattr_args *ap = v; |
228 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
229 | struct msdosfsmount *pmp = dep->de_pmp; |
230 | struct vattr *vap = ap->a_vap; |
231 | struct timespec ts; |
232 | uint32_t fileid; |
233 | |
234 | getnanotime(&ts); |
235 | DETIMES(dep, &ts, &ts, &ts)if ((dep)->de_flag & (0x0004 | 0x0008 | 0x0010)) { (dep )->de_flag |= 0x0020; if ((dep)->de_flag & 0x0004) { unix2dostime((&ts), &(dep)->de_MDate, &(dep)-> de_MTime, ((void *)0)); (dep)->de_Attributes |= 0x20; } if (!((dep)->de_pmp->pm_flags & 0x04)) { if ((dep)-> de_flag & 0x0010) unix2dostime((&ts), &(dep)-> de_ADate, ((void *)0), ((void *)0)); if ((dep)->de_flag & 0x0008) unix2dostime((&ts), &(dep)->de_CDate, & (dep)->de_CTime, &(dep)->de_CTimeHundredth); } (dep )->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
236 | vap->va_fsid = dep->de_dev; |
237 | |
238 | /* |
239 | * The following computation of the fileid must be the same as |
240 | * that used in msdosfs_readdir() to compute d_fileno. If not, |
241 | * pwd doesn't work. |
242 | * |
243 | * We now use the starting cluster number as the fileid/fileno. |
244 | * This works for both files and directories (including the root |
245 | * directory, on FAT32). Even on FAT32, this will at most be a |
246 | * 28-bit number, as the high 4 bits of FAT32 cluster numbers |
247 | * are reserved. |
248 | * |
249 | * However, we do need to do something for 0-length files, which |
250 | * will not have a starting cluster number. |
251 | * |
252 | * These files cannot be directories, since (except for /, which |
253 | * is special-cased anyway) directories contain entries for . and |
254 | * .., so must have non-zero length. |
255 | * |
256 | * In this case, we just create a non-cryptographic hash of the |
257 | * original fileid calculation, and set the top bit. |
258 | * |
259 | * This algorithm has the benefit that all directories, and all |
260 | * non-zero-length files, will have fileids that are persistent |
261 | * across mounts and reboots, and that cannot collide (as long |
262 | * as the filesystem is not corrupt). Zero-length files will |
263 | * have fileids that are persistent, but that may collide. We |
264 | * will just have to live with that. |
265 | */ |
266 | fileid = dep->de_StartCluster; |
267 | |
268 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) { |
269 | /* Special-case root */ |
270 | if (dep->de_StartCluster == MSDOSFSROOT0) |
271 | fileid = FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) ? pmp->pm_rootdirblk : 1; |
272 | } else { |
273 | if (dep->de_FileSize == 0) { |
274 | uint32_t dirsperblk; |
275 | uint64_t fileid64; |
276 | |
277 | dirsperblk = pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec / |
278 | sizeof(struct direntry); |
279 | |
280 | fileid64 = (dep->de_dirclust == MSDOSFSROOT0) ? |
281 | roottobn(pmp, 0)((((((((0))) >> (((pmp)))->pm_cnshift)) << ((( pmp))->pm_cnshift - ((pmp))->pm_bnshift))) + (pmp)-> pm_rootdirblk) : cntobn(pmp, dep->de_dirclust)((((dep->de_dirclust)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift)) + (pmp)->pm_firstcluster); |
282 | fileid64 *= dirsperblk; |
283 | fileid64 += dep->de_diroffset / sizeof(struct direntry); |
284 | |
285 | fileid = fileidhash(fileid64); |
286 | } |
287 | } |
288 | |
289 | vap->va_fileid = fileid; |
290 | vap->va_mode = (S_IRUSR0000400|S_IRGRP0000040|S_IROTH0000004); |
291 | if ((dep->de_Attributes & ATTR_READONLY0x01) == 0) |
292 | vap->va_mode |= (S_IWUSR0000200|S_IWGRP0000020|S_IWOTH0000002); |
293 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) { |
294 | vap->va_mode |= S_IFDIR0040000; |
295 | vap->va_mode |= (vap->va_mode & S_IRUSR0000400) ? S_IXUSR0000100 : 0; |
296 | vap->va_mode |= (vap->va_mode & S_IRGRP0000040) ? S_IXGRP0000010 : 0; |
297 | vap->va_mode |= (vap->va_mode & S_IROTH0000004) ? S_IXOTH0000001 : 0; |
298 | } |
299 | vap->va_mode &= dep->de_pmp->pm_mask; |
300 | vap->va_nlink = 1; |
301 | vap->va_gid = dep->de_pmp->pm_gid; |
302 | vap->va_uid = dep->de_pmp->pm_uid; |
303 | vap->va_rdev = 0; |
304 | vap->va_size = dep->de_FileSize; |
305 | dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); |
306 | if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME0x02) { |
307 | dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); |
308 | dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CTimeHundredth, &vap->va_ctime); |
309 | } else { |
310 | vap->va_atime = vap->va_mtime; |
311 | vap->va_ctime = vap->va_mtime; |
312 | } |
313 | vap->va_flags = 0; |
314 | if ((dep->de_Attributes & ATTR_ARCHIVE0x20) == 0) |
315 | vap->va_flags |= SF_ARCHIVED0x00010000; |
316 | vap->va_gen = 0; |
317 | vap->va_blocksize = dep->de_pmp->pm_bpcluster; |
318 | vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) & |
319 | ~(dep->de_pmp->pm_crbomask); |
320 | vap->va_type = ap->a_vp->v_type; |
321 | return (0); |
322 | } |
323 | |
324 | int |
325 | msdosfs_setattr(void *v) |
326 | { |
327 | struct vop_setattr_args *ap = v; |
328 | struct vnode *vp = ap->a_vp; |
329 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
330 | struct msdosfsmount *pmp = dep->de_pmp; |
331 | struct vattr *vap = ap->a_vap; |
332 | struct ucred *cred = ap->a_cred; |
333 | int error = 0; |
334 | |
335 | #ifdef MSDOSFS_DEBUG |
336 | printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", |
337 | ap->a_vp, vap, cred, ap->a_p); |
338 | #endif |
339 | if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL(-1)) || |
340 | (vap->va_fsid != VNOVAL(-1)) || (vap->va_fileid != VNOVAL(-1)) || |
341 | (vap->va_blocksize != VNOVAL(-1)) || (vap->va_rdev != VNOVAL(-1)) || |
342 | (vap->va_bytes != VNOVAL(-1)) || (vap->va_gen != VNOVAL(-1))) { |
343 | #ifdef MSDOSFS_DEBUG |
344 | printf("msdosfs_setattr(): returning EINVAL\n"); |
345 | printf(" va_type %d, va_nlink %x, va_fsid %ld, " |
346 | "va_fileid %llx\n", vap->va_type, vap->va_nlink, |
347 | vap->va_fsid, (unsigned long long)vap->va_fileid); |
348 | printf(" va_blocksize %lx, va_rdev %x, va_bytes %llx, " |
349 | "va_gen %lx\n", vap->va_blocksize, |
350 | (unsigned int)vap->va_rdev, |
351 | (unsigned long long)vap->va_bytes, vap->va_gen); |
352 | #endif |
353 | return (EINVAL22); |
354 | } |
355 | if (vap->va_flags != VNOVAL(-1)) { |
356 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
357 | return (EINVAL22); |
358 | if (cred->cr_uid != pmp->pm_uid) { |
359 | error = suser_ucred(cred); |
360 | if (error) |
361 | return (error); |
362 | } |
363 | /* |
364 | * We are very inconsistent about handling unsupported |
365 | * attributes. We ignored the access time and the |
366 | * read and execute bits. We were strict for the other |
367 | * attributes. |
368 | * |
369 | * Here we are strict, stricter than ufs in not allowing |
370 | * users to attempt to set SF_SETTABLE bits or anyone to |
371 | * set unsupported bits. However, we ignore attempts to |
372 | * set ATTR_ARCHIVE for directories `cp -pr' from a more |
373 | * sensible filesystem attempts it a lot. |
374 | */ |
375 | if (vap->va_flags & SF_SETTABLE0xffff0000) { |
376 | error = suser_ucred(cred); |
377 | if (error) |
378 | return (error); |
379 | } |
380 | if (vap->va_flags & ~SF_ARCHIVED0x00010000) |
381 | return EOPNOTSUPP45; |
382 | if (vap->va_flags & SF_ARCHIVED0x00010000) |
383 | dep->de_Attributes &= ~ATTR_ARCHIVE0x20; |
384 | else if (!(dep->de_Attributes & ATTR_DIRECTORY0x10)) |
385 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
386 | dep->de_flag |= DE_MODIFIED0x0020; |
387 | } |
388 | |
389 | if (vap->va_uid != (uid_t)VNOVAL(-1) || vap->va_gid != (gid_t)VNOVAL(-1)) { |
390 | uid_t uid; |
391 | gid_t gid; |
392 | |
393 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
394 | return (EINVAL22); |
395 | uid = vap->va_uid; |
396 | if (uid == (uid_t)VNOVAL(-1)) |
397 | uid = pmp->pm_uid; |
398 | gid = vap->va_gid; |
399 | if (gid == (gid_t)VNOVAL(-1)) |
400 | gid = pmp->pm_gid; |
401 | if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || |
402 | (gid != pmp->pm_gid && !groupmember(gid, cred))) { |
403 | error = suser_ucred(cred); |
404 | if (error) |
405 | return (error); |
406 | } |
407 | if (uid != pmp->pm_uid || gid != pmp->pm_gid) |
408 | return EINVAL22; |
409 | } |
410 | |
411 | if (vap->va_size != VNOVAL(-1)) { |
412 | switch (vp->v_type) { |
413 | case VDIR: |
414 | return (EISDIR21); |
415 | case VREG: |
416 | /* |
417 | * Truncation is only supported for regular files, |
418 | * Disallow it if the filesystem is read-only. |
419 | */ |
420 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
421 | return (EINVAL22); |
422 | break; |
423 | default: |
424 | /* |
425 | * According to POSIX, the result is unspecified |
426 | * for file types other than regular files, |
427 | * directories and shared memory objects. We |
428 | * don't support any file types except regular |
429 | * files and directories in this file system, so |
430 | * this (default) case is unreachable and can do |
431 | * anything. Keep falling through to detrunc() |
432 | * for now. |
433 | */ |
434 | break; |
435 | } |
436 | error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); |
437 | if (error) |
438 | return error; |
439 | } |
440 | if ((vap->va_vaflags & VA_UTIMES_CHANGE0x04) || |
441 | vap->va_atime.tv_nsec != VNOVAL(-1) || |
442 | vap->va_mtime.tv_nsec != VNOVAL(-1)) { |
443 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
444 | return (EINVAL22); |
445 | if (cred->cr_uid != pmp->pm_uid && |
446 | (error = suser_ucred(cred)) && |
447 | ((vap->va_vaflags & VA_UTIMES_NULL0x01) == 0 || |
448 | (error = VOP_ACCESS(ap->a_vp, VWRITE00200, cred, ap->a_p)))) |
449 | return (error); |
450 | if (vp->v_type != VDIR) { |
451 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN950x04) == 0 && |
452 | vap->va_atime.tv_nsec != VNOVAL(-1)) { |
453 | dep->de_flag &= ~DE_ACCESS0x0010; |
454 | unix2dostime(&vap->va_atime, &dep->de_ADate, |
455 | NULL((void *)0), NULL((void *)0)); |
456 | } |
457 | if (vap->va_mtime.tv_nsec != VNOVAL(-1)) { |
458 | dep->de_flag &= ~DE_UPDATE0x0004; |
459 | unix2dostime(&vap->va_mtime, &dep->de_MDate, |
460 | &dep->de_MTime, NULL((void *)0)); |
461 | } |
462 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
463 | dep->de_flag |= DE_MODIFIED0x0020; |
464 | } |
465 | } |
466 | /* |
467 | * DOS files only have the ability to have their writability |
468 | * attribute set, so we use the owner write bit to set the readonly |
469 | * attribute. |
470 | */ |
471 | if (vap->va_mode != (mode_t)VNOVAL(-1)) { |
472 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
473 | return (EINVAL22); |
474 | if (cred->cr_uid != pmp->pm_uid) { |
475 | error = suser_ucred(cred); |
476 | if (error) |
477 | return (error); |
478 | } |
479 | if (vp->v_type != VDIR) { |
480 | /* We ignore the read and execute bits. */ |
481 | if (vap->va_mode & VWRITE00200) |
482 | dep->de_Attributes &= ~ATTR_READONLY0x01; |
483 | else |
484 | dep->de_Attributes |= ATTR_READONLY0x01; |
485 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
486 | dep->de_flag |= DE_MODIFIED0x0020; |
487 | } |
488 | } |
489 | VN_KNOTE(ap->a_vp, NOTE_ATTRIB)knote_locked(&ap->a_vp->v_klist, (0x0008)); |
490 | return (deupdat(dep, 1)); |
491 | } |
492 | |
493 | int |
494 | msdosfs_read(void *v) |
495 | { |
496 | struct vop_read_args *ap = v; |
497 | struct vnode *vp = ap->a_vp; |
498 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
499 | struct msdosfsmount *pmp = dep->de_pmp; |
500 | struct uio *uio = ap->a_uio; |
501 | int isadir, error = 0; |
502 | uint32_t n, diff, size, on; |
503 | struct buf *bp; |
504 | uint32_t cn; |
505 | daddr_t bn; |
506 | |
507 | /* |
508 | * If they didn't ask for any data, then we are done. |
509 | */ |
510 | if (uio->uio_resid == 0) |
511 | return (0); |
512 | if (uio->uio_offset < 0) |
513 | return (EINVAL22); |
514 | |
515 | isadir = dep->de_Attributes & ATTR_DIRECTORY0x10; |
516 | do { |
517 | if (uio->uio_offset >= dep->de_FileSize) |
518 | return (0); |
519 | |
520 | cn = de_cluster(pmp, uio->uio_offset)((uio->uio_offset) >> (pmp)->pm_cnshift); |
521 | size = pmp->pm_bpcluster; |
522 | on = uio->uio_offset & pmp->pm_crbomask; |
523 | n = ulmin(pmp->pm_bpcluster - on, uio->uio_resid); |
524 | |
525 | /* |
526 | * de_FileSize is uint32_t, and we know that uio_offset < |
527 | * de_FileSize, so uio->uio_offset < 2^32. Therefore |
528 | * the cast to uint32_t on the next line is safe. |
529 | */ |
530 | diff = dep->de_FileSize - (uint32_t)uio->uio_offset; |
531 | if (diff < n) |
532 | n = diff; |
533 | |
534 | /* |
535 | * If we are operating on a directory file then be sure to |
536 | * do i/o with the vnode for the filesystem instead of the |
537 | * vnode for the directory. |
538 | */ |
539 | if (isadir) { |
540 | /* convert cluster # to block # */ |
541 | error = pcbmap(dep, cn, &bn, 0, &size); |
542 | if (error) |
543 | return (error); |
544 | error = bread(pmp->pm_devvp, bn, size, &bp); |
545 | } else { |
546 | if (de_cn2off(pmp, cn + 1)((cn + 1) << (pmp)->pm_cnshift) >= dep->de_FileSize) |
547 | error = bread(vp, cn, size, &bp); |
548 | else |
549 | error = bread_cluster(vp, cn, size, &bp); |
550 | } |
551 | n = min(n, pmp->pm_bpcluster - bp->b_resid); |
552 | if (error) { |
553 | brelse(bp); |
554 | return (error); |
555 | } |
556 | error = uiomove(bp->b_data + on, n, uio); |
557 | brelse(bp); |
558 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
559 | if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME0x00008000)) |
560 | dep->de_flag |= DE_ACCESS0x0010; |
561 | return (error); |
562 | } |
563 | |
564 | /* |
565 | * Write data to a file or directory. |
566 | */ |
567 | int |
568 | msdosfs_write(void *v) |
569 | { |
570 | struct vop_write_args *ap = v; |
571 | uint32_t n, croffset; |
572 | size_t resid; |
573 | ssize_t overrun; |
574 | int extended = 0; |
575 | uint32_t osize; |
576 | int error = 0; |
577 | uint32_t count, lastcn, cn; |
578 | struct buf *bp; |
579 | int ioflag = ap->a_ioflag; |
580 | struct uio *uio = ap->a_uio; |
581 | struct vnode *vp = ap->a_vp; |
582 | struct vnode *thisvp; |
583 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
584 | struct msdosfsmount *pmp = dep->de_pmp; |
585 | struct ucred *cred = ap->a_cred; |
586 | |
587 | #ifdef MSDOSFS_DEBUG |
588 | printf("msdosfs_write(vp %p, uio %p, ioflag %08x, cred %p\n", |
589 | vp, uio, ioflag, cred); |
590 | printf("msdosfs_write(): diroff %d, dirclust %d, startcluster %d\n", |
591 | dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); |
592 | #endif |
593 | |
594 | switch (vp->v_type) { |
595 | case VREG: |
596 | if (ioflag & IO_APPEND0x02) |
597 | uio->uio_offset = dep->de_FileSize; |
598 | thisvp = vp; |
599 | break; |
600 | case VDIR: |
601 | return EISDIR21; |
602 | default: |
603 | panic("msdosfs_write(): bad file type"); |
604 | } |
605 | |
606 | if (uio->uio_offset < 0) |
607 | return (EINVAL22); |
608 | |
609 | if (uio->uio_resid == 0) |
610 | return (0); |
611 | |
612 | /* Don't bother to try to write files larger than the f/s limit */ |
613 | if (uio->uio_offset > MSDOSFS_FILESIZE_MAX0xFFFFFFFFLL || |
614 | uio->uio_resid > (MSDOSFS_FILESIZE_MAX0xFFFFFFFFLL - uio->uio_offset)) |
615 | return (EFBIG27); |
616 | |
617 | /* do the filesize rlimit check */ |
618 | if ((error = vn_fsizechk(vp, uio, ioflag, &overrun))) |
619 | return (error); |
620 | |
621 | /* |
622 | * If the offset we are starting the write at is beyond the end of |
623 | * the file, then they've done a seek. Unix filesystems allow |
624 | * files with holes in them, DOS doesn't so we must fill the hole |
625 | * with zeroed blocks. |
626 | */ |
627 | if (uio->uio_offset > dep->de_FileSize) { |
628 | if ((error = deextend(dep, uio->uio_offset, cred)) != 0) |
629 | goto out; |
630 | } |
631 | |
632 | /* |
633 | * Remember some values in case the write fails. |
634 | */ |
635 | resid = uio->uio_resid; |
636 | osize = dep->de_FileSize; |
637 | |
638 | /* |
639 | * If we write beyond the end of the file, extend it to its ultimate |
640 | * size ahead of the time to hopefully get a contiguous area. |
641 | */ |
642 | if (uio->uio_offset + resid > osize) { |
643 | extended = 1; |
644 | count = de_clcount(pmp, uio->uio_offset + resid)(((uio->uio_offset + resid) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) - |
645 | de_clcount(pmp, osize)(((osize) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ); |
646 | if ((error = extendfile(dep, count, NULL((void *)0), NULL((void *)0), 0)) && |
647 | (error != ENOSPC28 || (ioflag & IO_UNIT0x01))) |
648 | goto errexit; |
649 | lastcn = dep->de_fc[FC_LASTFC1].fc_frcn; |
650 | } else |
651 | lastcn = de_clcount(pmp, osize)(((osize) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ) - 1; |
652 | |
653 | do { |
654 | croffset = uio->uio_offset & pmp->pm_crbomask; |
655 | cn = de_cluster(pmp, uio->uio_offset)((uio->uio_offset) >> (pmp)->pm_cnshift); |
656 | |
657 | if (cn > lastcn) { |
658 | error = ENOSPC28; |
659 | break; |
660 | } |
661 | |
662 | if (croffset == 0 && |
663 | (de_cluster(pmp, uio->uio_offset + uio->uio_resid)((uio->uio_offset + uio->uio_resid) >> (pmp)-> pm_cnshift) > cn || |
664 | (uio->uio_offset + uio->uio_resid) >= dep->de_FileSize)) { |
665 | /* |
666 | * If either the whole cluster gets written, |
667 | * or we write the cluster from its start beyond EOF, |
668 | * then no need to read data from disk. |
669 | */ |
670 | bp = getblk(thisvp, cn, pmp->pm_bpcluster, 0, INFSLP0xffffffffffffffffULL); |
671 | clrbuf(bp){ __builtin_bzero(((bp)->b_data), ((bp)->b_bcount)); (bp )->b_resid = 0; }; |
672 | /* |
673 | * Do the bmap now, since pcbmap needs buffers |
674 | * for the fat table. (see msdosfs_strategy) |
675 | */ |
676 | if (bp->b_blkno == bp->b_lblkno) { |
677 | error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); |
678 | if (error) |
679 | bp->b_blkno = -1; |
680 | } |
681 | if (bp->b_blkno == -1) { |
682 | brelse(bp); |
683 | if (!error) |
684 | error = EIO5; /* XXX */ |
685 | break; |
686 | } |
687 | } else { |
688 | /* |
689 | * The block we need to write into exists, so |
690 | * read it in. |
691 | */ |
692 | error = bread(thisvp, cn, pmp->pm_bpcluster, &bp); |
693 | if (error) { |
694 | brelse(bp); |
695 | break; |
696 | } |
697 | } |
698 | |
699 | n = ulmin(uio->uio_resid, pmp->pm_bpcluster - croffset); |
700 | if (uio->uio_offset + n > dep->de_FileSize) { |
701 | dep->de_FileSize = uio->uio_offset + n; |
702 | uvm_vnp_setsize(vp, dep->de_FileSize); |
703 | } |
704 | uvm_vnp_uncache(vp); |
705 | /* |
706 | * Should these vnode_pager_* functions be done on dir |
707 | * files? |
708 | */ |
709 | |
710 | /* |
711 | * Copy the data from user space into the buf header. |
712 | */ |
713 | error = uiomove(bp->b_data + croffset, n, uio); |
714 | |
715 | /* |
716 | * If they want this synchronous then write it and wait for |
717 | * it. Otherwise, if on a cluster boundary write it |
718 | * asynchronously so we can move on to the next block |
719 | * without delay. Otherwise do a delayed write because we |
720 | * may want to write somemore into the block later. |
721 | */ |
722 | #if 0 |
723 | if (ioflag & IO_NOCACHE0x40) |
724 | bp->b_flags |= B_NOCACHE0x00001000; |
725 | #endif |
726 | if (ioflag & IO_SYNC0x04) |
727 | (void) bwrite(bp); |
728 | else if (n + croffset == pmp->pm_bpcluster) |
729 | bawrite(bp); |
730 | else |
731 | bdwrite(bp); |
732 | dep->de_flag |= DE_UPDATE0x0004; |
733 | } while (error == 0 && uio->uio_resid > 0); |
734 | |
735 | if (resid > uio->uio_resid) |
736 | VN_KNOTE(ap->a_vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0))knote_locked(&ap->a_vp->v_klist, (0x0002 | (extended ? 0x0004 : 0))); |
737 | |
738 | if (dep->de_FileSize < osize) |
739 | VN_KNOTE(ap->a_vp, NOTE_TRUNCATE)knote_locked(&ap->a_vp->v_klist, (0x0080)); |
740 | |
741 | /* |
742 | * If the write failed and they want us to, truncate the file back |
743 | * to the size it was before the write was attempted. |
744 | */ |
745 | errexit: |
746 | if (error) { |
747 | if (ioflag & IO_UNIT0x01) { |
748 | detrunc(dep, osize, ioflag & IO_SYNC0x04, NOCRED((struct ucred *)-1), curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
749 | uio->uio_offset -= resid - uio->uio_resid; |
750 | uio->uio_resid = resid; |
751 | } else { |
752 | detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC0x04, NOCRED((struct ucred *)-1), curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
753 | if (uio->uio_resid != resid) |
754 | error = 0; |
755 | } |
756 | } else if (ioflag & IO_SYNC0x04) |
757 | error = deupdat(dep, 1); |
758 | |
759 | out: |
760 | /* correct the result for writes clamped by vn_fsizechk() */ |
761 | uio->uio_resid += overrun; |
762 | return (error); |
763 | } |
764 | |
765 | int |
766 | msdosfs_ioctl(void *v) |
767 | { |
768 | return (ENOTTY25); |
769 | } |
770 | |
771 | /* |
772 | * Flush the blocks of a file to disk. |
773 | * |
774 | * This function is worthless for vnodes that represent directories. Maybe we |
775 | * could just do a sync if they try an fsync on a directory file. |
776 | */ |
777 | int |
778 | msdosfs_fsync(void *v) |
779 | { |
780 | struct vop_fsync_args *ap = v; |
781 | struct vnode *vp = ap->a_vp; |
782 | |
783 | vflushbuf(vp, ap->a_waitfor == MNT_WAIT1); |
784 | return (deupdat(VTODE(vp)((struct denode *)(vp)->v_data), ap->a_waitfor == MNT_WAIT1)); |
785 | } |
786 | |
787 | /* |
788 | * Flush the blocks of a file to disk. |
789 | * |
790 | * This function is worthless for vnodes that represent directories. Maybe we |
791 | * could just do a sync if they try an fsync on a directory file. |
792 | */ |
793 | int |
794 | msdosfs_remove(void *v) |
795 | { |
796 | struct vop_remove_args *ap = v; |
797 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
798 | struct denode *ddep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
799 | int error; |
800 | |
801 | if (ap->a_vp->v_type == VDIR) |
802 | error = EPERM1; |
803 | else |
804 | error = removede(ddep, dep); |
805 | |
806 | VN_KNOTE(ap->a_vp, NOTE_DELETE)knote_locked(&ap->a_vp->v_klist, (0x0001)); |
807 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)knote_locked(&ap->a_dvp->v_klist, (0x0002)); |
808 | |
809 | #ifdef MSDOSFS_DEBUG |
810 | printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, |
811 | ap->a_vp->v_usecount); |
812 | #endif |
813 | if (ddep == dep) |
814 | vrele(ap->a_vp); |
815 | else |
816 | vput(ap->a_vp); /* causes msdosfs_inactive() to be called |
817 | * via vrele() */ |
818 | vput(ap->a_dvp); |
819 | return (error); |
820 | } |
821 | |
822 | /* |
823 | * DOS filesystems don't know what links are. But since we already called |
824 | * msdosfs_lookup() with create and lockparent, the parent is locked so we |
825 | * have to free it before we return the error. |
826 | */ |
827 | int |
828 | msdosfs_link(void *v) |
829 | { |
830 | struct vop_link_args *ap = v; |
831 | |
832 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
833 | vput(ap->a_dvp); |
834 | return (EOPNOTSUPP45); |
835 | } |
836 | |
837 | /* |
838 | * Renames on files require moving the denode to a new hash queue since the |
839 | * denode's location is used to compute which hash queue to put the file |
840 | * in. Unless it is a rename in place. For example "mv a b". |
841 | * |
842 | * What follows is the basic algorithm: |
843 | * |
844 | * if (file move) { |
845 | * if (dest file exists) { |
846 | * remove dest file |
847 | * } |
848 | * if (dest and src in same directory) { |
849 | * rewrite name in existing directory slot |
850 | * } else { |
851 | * write new entry in dest directory |
852 | * update offset and dirclust in denode |
853 | * move denode to new hash chain |
854 | * clear old directory entry |
855 | * } |
856 | * } else { |
857 | * directory move |
858 | * if (dest directory exists) { |
859 | * if (dest is not empty) { |
860 | * return ENOTEMPTY |
861 | * } |
862 | * remove dest directory |
863 | * } |
864 | * if (dest and src in same directory) { |
865 | * rewrite name in existing entry |
866 | * } else { |
867 | * be sure dest is not a child of src directory |
868 | * write entry in dest directory |
869 | * update "." and ".." in moved directory |
870 | * update offset and dirclust in denode |
871 | * move denode to new hash chain |
872 | * clear old directory entry for moved directory |
873 | * } |
874 | * } |
875 | * |
876 | * On entry: |
877 | * source's parent directory is unlocked |
878 | * source file or directory is unlocked |
879 | * destination's parent directory is locked |
880 | * destination file or directory is locked if it exists |
881 | * |
882 | * On exit: |
883 | * all denodes should be released |
884 | * |
885 | * Notes: |
886 | * I'm not sure how the memory containing the pathnames pointed at by the |
887 | * componentname structures is freed, there may be some memory bleeding |
888 | * for each rename done. |
889 | */ |
890 | int |
891 | msdosfs_rename(void *v) |
892 | { |
893 | struct vop_rename_args *ap = v; |
894 | struct vnode *tvp = ap->a_tvp; |
895 | struct vnode *tdvp = ap->a_tdvp; |
896 | struct vnode *fvp = ap->a_fvp; |
897 | struct vnode *fdvp = ap->a_fdvp; |
898 | struct componentname *tcnp = ap->a_tcnp; |
899 | struct componentname *fcnp = ap->a_fcnp; |
900 | struct denode *ip, *xp, *dp, *zp; |
901 | u_char toname[11], oldname[11]; |
902 | uint32_t from_diroffset, to_diroffset; |
903 | u_char to_count; |
904 | int doingdirectory = 0, newparent = 0; |
905 | int error; |
906 | uint32_t cn, pcl; |
907 | daddr_t bn; |
908 | struct msdosfsmount *pmp; |
909 | struct direntry *dotdotp; |
910 | struct buf *bp; |
911 | |
912 | pmp = VFSTOMSDOSFS(fdvp->v_mount)((struct msdosfsmount *)fdvp->v_mount->mnt_data); |
913 | |
914 | #ifdef DIAGNOSTIC1 |
915 | if ((tcnp->cn_flags & HASBUF0x000400) == 0 || |
916 | (fcnp->cn_flags & HASBUF0x000400) == 0) |
917 | panic("msdosfs_rename: no name"); |
918 | #endif |
919 | /* |
920 | * Check for cross-device rename. |
921 | */ |
922 | if ((fvp->v_mount != tdvp->v_mount) || |
923 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
924 | error = EXDEV18; |
925 | abortit: |
926 | VOP_ABORTOP(tdvp, tcnp); |
927 | if (tdvp == tvp) |
928 | vrele(tdvp); |
929 | else |
930 | vput(tdvp); |
931 | if (tvp) |
932 | vput(tvp); |
933 | VOP_ABORTOP(fdvp, fcnp); |
934 | vrele(fdvp); |
935 | vrele(fvp); |
936 | return (error); |
937 | } |
938 | |
939 | /* |
940 | * If source and dest are the same, do nothing. |
941 | */ |
942 | if (tvp == fvp) { |
943 | error = 0; |
944 | goto abortit; |
945 | } |
946 | |
947 | /* */ |
948 | if ((error = vn_lock(fvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL)) != 0) |
949 | goto abortit; |
950 | dp = VTODE(fdvp)((struct denode *)(fdvp)->v_data); |
951 | ip = VTODE(fvp)((struct denode *)(fvp)->v_data); |
952 | |
953 | /* |
954 | * Be sure we are not renaming ".", "..", or an alias of ".". This |
955 | * leads to a crippled directory tree. It's pretty tough to do a |
956 | * "ls" or "pwd" with the "." directory entry missing, and "cd .." |
957 | * doesn't work if the ".." entry is missing. |
958 | */ |
959 | if (ip->de_Attributes & ATTR_DIRECTORY0x10) { |
960 | /* |
961 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
962 | */ |
963 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
964 | dp == ip || |
965 | (fcnp->cn_flags & ISDOTDOT0x002000) || |
966 | (tcnp->cn_flags & ISDOTDOT0x002000) || |
967 | (ip->de_flag & DE_RENAME0x0040)) { |
968 | VOP_UNLOCK(fvp); |
969 | error = EINVAL22; |
970 | goto abortit; |
971 | } |
972 | ip->de_flag |= DE_RENAME0x0040; |
973 | doingdirectory++; |
974 | } |
975 | VN_KNOTE(fdvp, NOTE_WRITE)knote_locked(&fdvp->v_klist, (0x0002)); /* XXX right place? */ |
976 | |
977 | /* |
978 | * When the target exists, both the directory |
979 | * and target vnodes are returned locked. |
980 | */ |
981 | dp = VTODE(tdvp)((struct denode *)(tdvp)->v_data); |
982 | xp = tvp ? VTODE(tvp)((struct denode *)(tvp)->v_data) : NULL((void *)0); |
983 | /* |
984 | * Remember direntry place to use for destination |
985 | */ |
986 | to_diroffset = dp->de_fndoffset; |
987 | to_count = dp->de_fndcnt; |
988 | |
989 | /* |
990 | * If ".." must be changed (ie the directory gets a new |
991 | * parent) then the source directory must not be in the |
992 | * directory hierarchy above the target, as this would |
993 | * orphan everything below the source directory. Also |
994 | * the user must have write permission in the source so |
995 | * as to be able to change "..". We must repeat the call |
996 | * to namei, as the parent directory is unlocked by the |
997 | * call to doscheckpath(). |
998 | */ |
999 | error = VOP_ACCESS(fvp, VWRITE00200, tcnp->cn_cred, tcnp->cn_proc); |
1000 | VOP_UNLOCK(fvp); |
1001 | if (VTODE(fdvp)((struct denode *)(fdvp)->v_data)->de_StartCluster != VTODE(tdvp)((struct denode *)(tdvp)->v_data)->de_StartCluster) |
1002 | newparent = 1; |
1003 | vrele(fdvp); |
1004 | if (doingdirectory && newparent) { |
1005 | if (error) /* write access check above */ |
1006 | goto bad1; |
1007 | if (xp != NULL((void *)0)) |
1008 | vput(tvp); |
1009 | /* |
1010 | * doscheckpath() vput()'s dp, |
1011 | * so we have to do a relookup afterwards |
1012 | */ |
1013 | if ((error = doscheckpath(ip, dp)) != 0) |
1014 | goto out; |
1015 | if ((tcnp->cn_flags & SAVESTART0x001000) == 0) |
1016 | panic("msdosfs_rename: lost to startdir"); |
1017 | if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0) |
1018 | goto out; |
1019 | dp = VTODE(tdvp)((struct denode *)(tdvp)->v_data); |
1020 | xp = tvp ? VTODE(tvp)((struct denode *)(tvp)->v_data) : NULL((void *)0); |
1021 | } |
1022 | |
1023 | VN_KNOTE(tdvp, NOTE_WRITE)knote_locked(&tdvp->v_klist, (0x0002)); |
1024 | |
1025 | if (xp != NULL((void *)0)) { |
1026 | /* |
1027 | * Target must be empty if a directory and have no links |
1028 | * to it. Also, ensure source and target are compatible |
1029 | * (both directories, or both not directories). |
1030 | */ |
1031 | if (xp->de_Attributes & ATTR_DIRECTORY0x10) { |
1032 | if (!dosdirempty(xp)) { |
1033 | error = ENOTEMPTY66; |
1034 | goto bad1; |
1035 | } |
1036 | if (!doingdirectory) { |
1037 | error = ENOTDIR20; |
1038 | goto bad1; |
1039 | } |
1040 | cache_purge(tdvp); |
1041 | } else if (doingdirectory) { |
1042 | error = EISDIR21; |
1043 | goto bad1; |
1044 | } |
1045 | if ((error = removede(dp, xp)) != 0) |
1046 | goto bad1; |
1047 | VN_KNOTE(tvp, NOTE_DELETE)knote_locked(&tvp->v_klist, (0x0001)); |
1048 | vput(tvp); |
1049 | xp = NULL((void *)0); |
1050 | } |
1051 | |
1052 | /* |
1053 | * Convert the filename in tcnp into a dos filename. We copy this |
1054 | * into the denode and directory entry for the destination |
1055 | * file/directory. |
1056 | */ |
1057 | if ((error = uniqdosname(VTODE(tdvp)((struct denode *)(tdvp)->v_data), tcnp, toname)) != 0) |
1058 | goto bad1; |
1059 | |
1060 | /* |
1061 | * Since from wasn't locked at various places above, |
1062 | * have to do a relookup here. |
1063 | */ |
1064 | fcnp->cn_flags &= ~MODMASK0x00fc; |
1065 | fcnp->cn_flags |= LOCKPARENT0x0008 | LOCKLEAF0x0004; |
1066 | if ((fcnp->cn_flags & SAVESTART0x001000) == 0) |
1067 | panic("msdosfs_rename: lost from startdir"); |
1068 | if (!newparent) |
1069 | VOP_UNLOCK(tdvp); |
1070 | (void) vfs_relookup(fdvp, &fvp, fcnp); |
1071 | if (fvp == NULL((void *)0)) { |
1072 | /* |
1073 | * From name has disappeared. |
1074 | */ |
1075 | if (doingdirectory) |
1076 | panic("rename: lost dir entry"); |
1077 | vrele(ap->a_fvp); |
1078 | if (newparent) |
1079 | VOP_UNLOCK(tdvp); |
1080 | vrele(tdvp); |
1081 | return 0; |
1082 | } |
1083 | xp = VTODE(fvp)((struct denode *)(fvp)->v_data); |
1084 | zp = VTODE(fdvp)((struct denode *)(fdvp)->v_data); |
1085 | from_diroffset = zp->de_fndoffset; |
1086 | |
1087 | /* |
1088 | * Ensure that the directory entry still exists and has not |
1089 | * changed till now. If the source is a file the entry may |
1090 | * have been unlinked or renamed. In either case there is |
1091 | * no further work to be done. If the source is a directory |
1092 | * then it cannot have been rmdir'ed or renamed; this is |
1093 | * prohibited by the DE_RENAME flag. |
1094 | */ |
1095 | if (xp != ip) { |
1096 | if (doingdirectory) |
1097 | panic("rename: lost dir entry"); |
1098 | vrele(ap->a_fvp); |
1099 | if (newparent) |
1100 | VOP_UNLOCK(fdvp); |
1101 | xp = NULL((void *)0); |
1102 | } else { |
1103 | vrele(fvp); |
1104 | xp = NULL((void *)0); |
1105 | |
1106 | /* |
1107 | * First write a new entry in the destination |
1108 | * directory and mark the entry in the source directory |
1109 | * as deleted. Then move the denode to the correct hash |
1110 | * chain for its new location in the filesystem. And, if |
1111 | * we moved a directory, then update its .. entry to point |
1112 | * to the new parent directory. |
1113 | */ |
1114 | bcopy(ip->de_Name, oldname, 11); |
1115 | bcopy(toname, ip->de_Name, 11); /* update denode */ |
1116 | dp->de_fndoffset = to_diroffset; |
1117 | dp->de_fndcnt = to_count; |
1118 | error = createde(ip, dp, NULL((void *)0), tcnp); |
1119 | if (error) { |
1120 | bcopy(oldname, ip->de_Name, 11); |
1121 | if (newparent) |
1122 | VOP_UNLOCK(fdvp); |
1123 | goto bad; |
1124 | } |
1125 | ip->de_refcnt++; |
1126 | zp->de_fndoffset = from_diroffset; |
1127 | if ((error = removede(zp, ip)) != 0) { |
1128 | /* XXX should really panic here, fs is corrupt */ |
1129 | if (newparent) |
1130 | VOP_UNLOCK(fdvp); |
1131 | goto bad; |
1132 | } |
1133 | |
1134 | cache_purge(fvp); |
1135 | |
1136 | if (!doingdirectory) { |
1137 | error = pcbmap(dp, de_cluster(pmp, to_diroffset)((to_diroffset) >> (pmp)->pm_cnshift), 0, |
1138 | &ip->de_dirclust, 0); |
1139 | if (error) { |
1140 | /* XXX should really panic here, fs is corrupt */ |
1141 | if (newparent) |
1142 | VOP_UNLOCK(fdvp); |
1143 | goto bad; |
1144 | } |
1145 | ip->de_diroffset = to_diroffset; |
1146 | if (ip->de_dirclust != MSDOSFSROOT0) |
1147 | ip->de_diroffset &= pmp->pm_crbomask; |
1148 | } |
1149 | reinsert(ip); |
1150 | if (newparent) |
1151 | VOP_UNLOCK(fdvp); |
1152 | } |
1153 | |
1154 | /* |
1155 | * If we moved a directory to a new parent directory, then we must |
1156 | * fixup the ".." entry in the moved directory. |
1157 | */ |
1158 | if (doingdirectory && newparent) { |
1159 | cn = ip->de_StartCluster; |
1160 | if (cn == MSDOSFSROOT0) { |
1161 | /* this should never happen */ |
1162 | panic("msdosfs_rename: updating .. in root directory?"); |
1163 | } else |
1164 | bn = cntobn(pmp, cn)((((cn)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift )) + (pmp)->pm_firstcluster); |
1165 | error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); |
1166 | if (error) { |
1167 | /* XXX should really panic here, fs is corrupt */ |
1168 | brelse(bp); |
1169 | goto bad; |
1170 | } |
1171 | dotdotp = (struct direntry *)bp->b_data; |
1172 | putushort(dotdotp[0].deStartCluster, cn)(*((u_int16_t *)(dotdotp[0].deStartCluster)) = (cn)); |
1173 | pcl = dp->de_StartCluster; |
1174 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && pcl == pmp->pm_rootdirblk) |
1175 | pcl = 0; |
1176 | putushort(dotdotp[1].deStartCluster, pcl)(*((u_int16_t *)(dotdotp[1].deStartCluster)) = (pcl)); |
1177 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
1178 | putushort(dotdotp[0].deHighClust, cn >> 16)(*((u_int16_t *)(dotdotp[0].deHighClust)) = (cn >> 16)); |
1179 | putushort(dotdotp[1].deHighClust, pcl >> 16)(*((u_int16_t *)(dotdotp[1].deHighClust)) = (pcl >> 16) ); |
1180 | } |
1181 | if ((error = bwrite(bp)) != 0) { |
1182 | /* XXX should really panic here, fs is corrupt */ |
1183 | goto bad; |
1184 | } |
1185 | } |
1186 | |
1187 | VN_KNOTE(fvp, NOTE_RENAME)knote_locked(&fvp->v_klist, (0x0020)); |
1188 | |
1189 | bad: |
1190 | VOP_UNLOCK(fvp); |
1191 | vrele(fdvp); |
1192 | bad1: |
1193 | if (xp) |
1194 | vput(tvp); |
1195 | vput(tdvp); |
1196 | out: |
1197 | ip->de_flag &= ~DE_RENAME0x0040; |
1198 | vrele(fvp); |
1199 | return (error); |
1200 | |
1201 | } |
1202 | |
1203 | struct { |
1204 | struct direntry dot; |
1205 | struct direntry dotdot; |
1206 | } dosdirtemplate = { |
1207 | { ". ", " ", /* the . entry */ |
1208 | ATTR_DIRECTORY0x10, /* file attribute */ |
1209 | CASE_LOWER_BASE0x08 | CASE_LOWER_EXT0x10, /* lower case */ |
1210 | 0, /* create time 100ths */ |
1211 | { 0, 0 }, { 0, 0 }, /* create time & date */ |
1212 | { 0, 0 }, /* access date */ |
1213 | { 0, 0 }, /* high bits of start cluster */ |
1214 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
1215 | { 0, 0 }, /* startcluster */ |
1216 | { 0, 0, 0, 0 } /* filesize */ |
1217 | }, |
1218 | { ".. ", " ", /* the .. entry */ |
1219 | ATTR_DIRECTORY0x10, /* file attribute */ |
1220 | CASE_LOWER_BASE0x08 | CASE_LOWER_EXT0x10, /* lower case */ |
1221 | 0, /* create time 100ths */ |
1222 | { 0, 0 }, { 0, 0 }, /* create time & date */ |
1223 | { 0, 0 }, /* access date */ |
1224 | { 0, 0 }, /* high bits of start cluster */ |
1225 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
1226 | { 0, 0 }, /* startcluster */ |
1227 | { 0, 0, 0, 0 } /* filesize */ |
1228 | } |
1229 | }; |
1230 | |
1231 | int |
1232 | msdosfs_mkdir(void *v) |
1233 | { |
1234 | struct vop_mkdir_args *ap = v; |
1235 | struct componentname *cnp = ap->a_cnp; |
1236 | struct denode ndirent; |
1237 | struct denode *dep; |
1238 | struct denode *pdep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
1239 | int error; |
1240 | daddr_t bn; |
1241 | uint32_t newcluster, pcl; |
1242 | struct direntry *denp; |
1243 | struct msdosfsmount *pmp = pdep->de_pmp; |
1244 | struct buf *bp; |
1245 | struct timespec ts; |
1246 | |
1247 | /* |
1248 | * If this is the root directory and there is no space left we |
1249 | * can't do anything. This is because the root directory can not |
1250 | * change size. |
1251 | */ |
1252 | if (pdep->de_StartCluster == MSDOSFSROOT0 |
1253 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
1254 | error = ENOSPC28; |
1255 | goto bad2; |
1256 | } |
1257 | |
1258 | /* |
1259 | * Allocate a cluster to hold the about to be created directory. |
1260 | */ |
1261 | error = clusteralloc(pmp, 0, 1, &newcluster, NULL((void *)0)); |
1262 | if (error) |
1263 | goto bad2; |
1264 | |
1265 | bzero(&ndirent, sizeof(ndirent))__builtin_bzero((&ndirent), (sizeof(ndirent))); |
1266 | ndirent.de_pmp = pmp; |
1267 | ndirent.de_flag = DE_ACCESS0x0010 | DE_CREATE0x0008 | DE_UPDATE0x0004; |
1268 | getnanotime(&ts); |
1269 | DETIMES(&ndirent, &ts, &ts, &ts)if ((&ndirent)->de_flag & (0x0004 | 0x0008 | 0x0010 )) { (&ndirent)->de_flag |= 0x0020; if ((&ndirent) ->de_flag & 0x0004) { unix2dostime((&ts), &(& ndirent)->de_MDate, &(&ndirent)->de_MTime, ((void *)0)); (&ndirent)->de_Attributes |= 0x20; } if (!((& ndirent)->de_pmp->pm_flags & 0x04)) { if ((&ndirent )->de_flag & 0x0010) unix2dostime((&ts), &(& ndirent)->de_ADate, ((void *)0), ((void *)0)); if ((&ndirent )->de_flag & 0x0008) unix2dostime((&ts), &(& ndirent)->de_CDate, &(&ndirent)->de_CTime, & (&ndirent)->de_CTimeHundredth); } (&ndirent)->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
1270 | |
1271 | /* |
1272 | * Now fill the cluster with the "." and ".." entries. And write |
1273 | * the cluster to disk. This way it is there for the parent |
1274 | * directory to be pointing at if there were a crash. |
1275 | */ |
1276 | bn = cntobn(pmp, newcluster)((((newcluster)-2) << (((pmp))->pm_cnshift - ((pmp)) ->pm_bnshift)) + (pmp)->pm_firstcluster); |
1277 | /* always succeeds */ |
1278 | bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, INFSLP0xffffffffffffffffULL); |
1279 | bzero(bp->b_data, pmp->pm_bpcluster)__builtin_bzero((bp->b_data), (pmp->pm_bpcluster)); |
1280 | bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); |
1281 | denp = (struct direntry *)bp->b_data; |
1282 | putushort(denp[0].deStartCluster, newcluster)(*((u_int16_t *)(denp[0].deStartCluster)) = (newcluster)); |
1283 | putushort(denp[0].deCDate, ndirent.de_CDate)(*((u_int16_t *)(denp[0].deCDate)) = (ndirent.de_CDate)); |
1284 | putushort(denp[0].deCTime, ndirent.de_CTime)(*((u_int16_t *)(denp[0].deCTime)) = (ndirent.de_CTime)); |
1285 | denp[0].deCTimeHundredth = ndirent.de_CTimeHundredth; |
1286 | putushort(denp[0].deADate, ndirent.de_ADate)(*((u_int16_t *)(denp[0].deADate)) = (ndirent.de_ADate)); |
1287 | putushort(denp[0].deMDate, ndirent.de_MDate)(*((u_int16_t *)(denp[0].deMDate)) = (ndirent.de_MDate)); |
1288 | putushort(denp[0].deMTime, ndirent.de_MTime)(*((u_int16_t *)(denp[0].deMTime)) = (ndirent.de_MTime)); |
1289 | pcl = pdep->de_StartCluster; |
1290 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && pcl == pmp->pm_rootdirblk) |
1291 | pcl = 0; |
1292 | putushort(denp[1].deStartCluster, pcl)(*((u_int16_t *)(denp[1].deStartCluster)) = (pcl)); |
1293 | putushort(denp[1].deCDate, ndirent.de_CDate)(*((u_int16_t *)(denp[1].deCDate)) = (ndirent.de_CDate)); |
1294 | putushort(denp[1].deCTime, ndirent.de_CTime)(*((u_int16_t *)(denp[1].deCTime)) = (ndirent.de_CTime)); |
1295 | denp[1].deCTimeHundredth = ndirent.de_CTimeHundredth; |
1296 | putushort(denp[1].deADate, ndirent.de_ADate)(*((u_int16_t *)(denp[1].deADate)) = (ndirent.de_ADate)); |
1297 | putushort(denp[1].deMDate, ndirent.de_MDate)(*((u_int16_t *)(denp[1].deMDate)) = (ndirent.de_MDate)); |
1298 | putushort(denp[1].deMTime, ndirent.de_MTime)(*((u_int16_t *)(denp[1].deMTime)) = (ndirent.de_MTime)); |
1299 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
1300 | putushort(denp[0].deHighClust, newcluster >> 16)(*((u_int16_t *)(denp[0].deHighClust)) = (newcluster >> 16)); |
1301 | putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16)(*((u_int16_t *)(denp[1].deHighClust)) = (pdep->de_StartCluster >> 16)); |
1302 | } |
1303 | |
1304 | if ((error = bwrite(bp)) != 0) |
1305 | goto bad; |
1306 | |
1307 | /* |
1308 | * Now build up a directory entry pointing to the newly allocated |
1309 | * cluster. This will be written to an empty slot in the parent |
1310 | * directory. |
1311 | */ |
1312 | #ifdef DIAGNOSTIC1 |
1313 | if ((cnp->cn_flags & HASBUF0x000400) == 0) |
1314 | panic("msdosfs_mkdir: no name"); |
1315 | #endif |
1316 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
1317 | goto bad; |
1318 | |
1319 | ndirent.de_Attributes = ATTR_DIRECTORY0x10; |
1320 | ndirent.de_StartCluster = newcluster; |
1321 | ndirent.de_FileSize = 0; |
1322 | ndirent.de_dev = pdep->de_dev; |
1323 | ndirent.de_devvp = pdep->de_devvp; |
1324 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
1325 | goto bad; |
1326 | if ((cnp->cn_flags & SAVESTART0x001000) == 0) |
1327 | pool_put(&namei_pool, cnp->cn_pnbuf); |
1328 | VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK)knote_locked(&ap->a_dvp->v_klist, (0x0002 | 0x0010) ); |
1329 | vput(ap->a_dvp); |
1330 | *ap->a_vpp = DETOV(dep)((dep)->de_vnode); |
1331 | return (0); |
1332 | |
1333 | bad: |
1334 | clusterfree(pmp, newcluster, NULL((void *)0)); |
1335 | bad2: |
1336 | pool_put(&namei_pool, cnp->cn_pnbuf); |
1337 | vput(ap->a_dvp); |
1338 | return (error); |
1339 | } |
1340 | |
1341 | int |
1342 | msdosfs_rmdir(void *v) |
1343 | { |
1344 | struct vop_rmdir_args *ap = v; |
1345 | struct vnode *vp = ap->a_vp; |
1346 | struct vnode *dvp = ap->a_dvp; |
1347 | struct componentname *cnp = ap->a_cnp; |
1348 | struct denode *ip, *dp; |
1349 | int error; |
1350 | |
1351 | ip = VTODE(vp)((struct denode *)(vp)->v_data); |
1352 | dp = VTODE(dvp)((struct denode *)(dvp)->v_data); |
1353 | /* |
1354 | * Verify the directory is empty (and valid). |
1355 | * (Rmdir ".." won't be valid since |
1356 | * ".." will contain a reference to |
1357 | * the current directory and thus be |
1358 | * non-empty.) |
1359 | */ |
1360 | error = 0; |
Value stored to 'error' is never read | |
1361 | if (!dosdirempty(ip) || ip->de_flag & DE_RENAME0x0040) { |
1362 | error = ENOTEMPTY66; |
1363 | goto out; |
1364 | } |
1365 | |
1366 | VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK)knote_locked(&dvp->v_klist, (0x0002 | 0x0010)); |
1367 | |
1368 | /* |
1369 | * Delete the entry from the directory. For dos filesystems this |
1370 | * gets rid of the directory entry on disk, the in memory copy |
1371 | * still exists but the de_refcnt is <= 0. This prevents it from |
1372 | * being found by deget(). When the vput() on dep is done we give |
1373 | * up access and eventually msdosfs_reclaim() will be called which |
1374 | * will remove it from the denode cache. |
1375 | */ |
1376 | if ((error = removede(dp, ip)) != 0) |
1377 | goto out; |
1378 | /* |
1379 | * This is where we decrement the link count in the parent |
1380 | * directory. Since dos filesystems don't do this we just purge |
1381 | * the name cache and let go of the parent directory denode. |
1382 | */ |
1383 | cache_purge(dvp); |
1384 | vput(dvp); |
1385 | dvp = NULL((void *)0); |
1386 | /* |
1387 | * Truncate the directory that is being deleted. |
1388 | */ |
1389 | error = detrunc(ip, (uint32_t)0, IO_SYNC0x04, cnp->cn_cred, cnp->cn_proc); |
1390 | cache_purge(vp); |
1391 | out: |
1392 | if (dvp) |
1393 | vput(dvp); |
1394 | VN_KNOTE(vp, NOTE_DELETE)knote_locked(&vp->v_klist, (0x0001)); |
1395 | vput(vp); |
1396 | return (error); |
1397 | } |
1398 | |
1399 | /* |
1400 | * DOS filesystems don't know what symlinks are. |
1401 | */ |
1402 | int |
1403 | msdosfs_symlink(void *v) |
1404 | { |
1405 | struct vop_symlink_args *ap = v; |
1406 | |
1407 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
1408 | vput(ap->a_dvp); |
1409 | return (EOPNOTSUPP45); |
1410 | } |
1411 | |
1412 | int |
1413 | msdosfs_readdir(void *v) |
1414 | { |
1415 | struct vop_readdir_args *ap = v; |
1416 | int error = 0; |
1417 | int diff; |
1418 | long n; |
1419 | int blsize; |
1420 | long on; |
1421 | long lost; |
1422 | long count; |
1423 | uint32_t dirsperblk; |
1424 | uint32_t cn, lbn; |
1425 | uint32_t fileno; |
1426 | long bias = 0; |
1427 | daddr_t bn; |
1428 | struct buf *bp; |
1429 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
1430 | struct msdosfsmount *pmp = dep->de_pmp; |
1431 | struct direntry *dentp; |
1432 | struct dirent dirbuf; |
1433 | struct uio *uio = ap->a_uio; |
1434 | off_t offset, wlast = -1; |
1435 | int chksum = -1; |
1436 | |
1437 | #ifdef MSDOSFS_DEBUG |
1438 | printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", |
1439 | ap->a_vp, uio, ap->a_cred, ap->a_eofflag); |
1440 | #endif |
1441 | |
1442 | /* |
1443 | * msdosfs_readdir() won't operate properly on regular files since |
1444 | * it does i/o only with the filesystem vnode, and hence can |
1445 | * retrieve the wrong block from the buffer cache for a plain file. |
1446 | * So, fail attempts to readdir() on a plain file. |
1447 | */ |
1448 | if ((dep->de_Attributes & ATTR_DIRECTORY0x10) == 0) |
1449 | return (ENOTDIR20); |
1450 | |
1451 | /* |
1452 | * To be safe, initialize dirbuf |
1453 | */ |
1454 | bzero(&dirbuf, sizeof(dirbuf))__builtin_bzero((&dirbuf), (sizeof(dirbuf))); |
1455 | |
1456 | /* |
1457 | * If the user buffer is smaller than the size of one dos directory |
1458 | * entry or the file offset is not a multiple of the size of a |
1459 | * directory entry, then we fail the read. |
1460 | */ |
1461 | count = uio->uio_resid & ~(sizeof(struct direntry) - 1); |
1462 | offset = uio->uio_offset; |
1463 | if (count < sizeof(struct direntry) || |
1464 | (offset & (sizeof(struct direntry) - 1))) |
1465 | return (EINVAL22); |
1466 | lost = uio->uio_resid - count; |
1467 | uio->uio_resid = count; |
1468 | |
1469 | dirsperblk = pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec / sizeof(struct direntry); |
1470 | |
1471 | /* |
1472 | * If they are reading from the root directory then, we simulate |
1473 | * the . and .. entries since these don't exist in the root |
1474 | * directory. We also set the offset bias to make up for having to |
1475 | * simulate these entries. By this I mean that at file offset 64 we |
1476 | * read the first entry in the root directory that lives on disk. |
1477 | */ |
1478 | if (dep->de_StartCluster == MSDOSFSROOT0 |
1479 | || (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dep->de_StartCluster == pmp->pm_rootdirblk)) { |
1480 | #if 0 |
1481 | printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", |
1482 | offset); |
1483 | #endif |
1484 | bias = 2 * sizeof(struct direntry); |
1485 | if (offset < bias) { |
1486 | for (n = (int)offset / sizeof(struct direntry); |
1487 | n < 2; n++) { |
1488 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
1489 | dirbuf.d_fileno = pmp->pm_rootdirblk; |
1490 | else |
1491 | dirbuf.d_fileno = 1; |
1492 | dirbuf.d_type = DT_DIR4; |
1493 | switch (n) { |
1494 | case 0: |
1495 | dirbuf.d_namlen = 1; |
1496 | strlcpy(dirbuf.d_name, ".", |
1497 | sizeof dirbuf.d_name); |
1498 | break; |
1499 | case 1: |
1500 | dirbuf.d_namlen = 2; |
1501 | strlcpy(dirbuf.d_name, "..", |
1502 | sizeof dirbuf.d_name); |
1503 | break; |
1504 | } |
1505 | dirbuf.d_reclen = DIRENT_SIZE(&dirbuf)((__builtin_offsetof(struct dirent, d_name) + ((&dirbuf)-> d_namlen) + 1 + 7) &~ 7); |
1506 | dirbuf.d_off = offset + |
1507 | sizeof(struct direntry); |
1508 | if (uio->uio_resid < dirbuf.d_reclen) |
1509 | goto out; |
1510 | error = uiomove(&dirbuf, dirbuf.d_reclen, uio); |
1511 | if (error) |
1512 | goto out; |
1513 | offset = dirbuf.d_off; |
1514 | } |
1515 | } |
1516 | } |
1517 | |
1518 | while (uio->uio_resid > 0) { |
1519 | lbn = de_cluster(pmp, offset - bias)((offset - bias) >> (pmp)->pm_cnshift); |
1520 | on = (offset - bias) & pmp->pm_crbomask; |
1521 | n = min(pmp->pm_bpcluster - on, uio->uio_resid); |
1522 | diff = dep->de_FileSize - (offset - bias); |
1523 | if (diff <= 0) |
1524 | break; |
1525 | n = min(n, diff); |
1526 | if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) |
1527 | break; |
1528 | error = bread(pmp->pm_devvp, bn, blsize, &bp); |
1529 | if (error) { |
1530 | brelse(bp); |
1531 | return (error); |
1532 | } |
1533 | n = min(n, blsize - bp->b_resid); |
1534 | |
1535 | /* |
1536 | * Convert from dos directory entries to fs-independent |
1537 | * directory entries. |
1538 | */ |
1539 | for (dentp = (struct direntry *)(bp->b_data + on); |
1540 | (char *)dentp < bp->b_data + on + n; |
1541 | dentp++, offset += sizeof(struct direntry)) { |
1542 | #if 0 |
1543 | printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", |
1544 | dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); |
1545 | #endif |
1546 | /* |
1547 | * If this is an unused entry, we can stop. |
1548 | */ |
1549 | if (dentp->deName[0] == SLOT_EMPTY0x00) { |
1550 | brelse(bp); |
1551 | goto out; |
1552 | } |
1553 | /* |
1554 | * Skip deleted entries. |
1555 | */ |
1556 | if (dentp->deName[0] == SLOT_DELETED0xe5) { |
1557 | chksum = -1; |
1558 | wlast = -1; |
1559 | continue; |
1560 | } |
1561 | |
1562 | /* |
1563 | * Handle Win95 long directory entries |
1564 | */ |
1565 | if (dentp->deAttributes == ATTR_WIN950x0f) { |
1566 | struct winentry *wep; |
1567 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME0x01) |
1568 | continue; |
1569 | wep = (struct winentry *)dentp; |
1570 | chksum = win2unixfn(wep, &dirbuf, chksum); |
1571 | if (wep->weCnt & WIN_LAST0x40) |
1572 | wlast = offset; |
1573 | continue; |
1574 | } |
1575 | |
1576 | /* |
1577 | * Skip volume labels |
1578 | */ |
1579 | if (dentp->deAttributes & ATTR_VOLUME0x08) { |
1580 | chksum = -1; |
1581 | wlast = -1; |
1582 | continue; |
1583 | } |
1584 | |
1585 | /* |
1586 | * This computation of d_fileno must match |
1587 | * the computation of va_fileid in |
1588 | * msdosfs_getattr. |
1589 | */ |
1590 | fileno = getushort(dentp->deStartCluster)*((u_int16_t *)(dentp->deStartCluster)); |
1591 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
1592 | fileno |= getushort(dentp->deHighClust)*((u_int16_t *)(dentp->deHighClust)) << 16; |
1593 | |
1594 | if (dentp->deAttributes & ATTR_DIRECTORY0x10) { |
1595 | /* Special-case root */ |
1596 | if (fileno == MSDOSFSROOT0) { |
1597 | fileno = FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) ? |
1598 | pmp->pm_rootdirblk : 1; |
1599 | } |
1600 | |
1601 | dirbuf.d_fileno = fileno; |
1602 | dirbuf.d_type = DT_DIR4; |
1603 | } else { |
1604 | if (getulong(dentp->deFileSize)*((u_int32_t *)(dentp->deFileSize)) == 0) { |
1605 | uint64_t fileno64; |
1606 | |
1607 | fileno64 = (cn == MSDOSFSROOT0) ? |
1608 | roottobn(pmp, 0)((((((((0))) >> (((pmp)))->pm_cnshift)) << ((( pmp))->pm_cnshift - ((pmp))->pm_bnshift))) + (pmp)-> pm_rootdirblk) : cntobn(pmp, cn)((((cn)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift )) + (pmp)->pm_firstcluster); |
1609 | |
1610 | fileno64 *= dirsperblk; |
1611 | fileno64 += dentp - |
1612 | (struct direntry *)bp->b_data; |
1613 | |
1614 | fileno = fileidhash(fileno64); |
1615 | } |
1616 | |
1617 | dirbuf.d_fileno = fileno; |
1618 | dirbuf.d_type = DT_REG8; |
1619 | } |
1620 | |
1621 | if (chksum != winChksum(dentp->deName)) |
1622 | dirbuf.d_namlen = dos2unixfn(dentp->deName, |
1623 | (u_char *)dirbuf.d_name, |
1624 | pmp->pm_flags & MSDOSFSMNT_SHORTNAME0x01); |
1625 | else |
1626 | dirbuf.d_name[dirbuf.d_namlen] = 0; |
1627 | chksum = -1; |
1628 | dirbuf.d_reclen = DIRENT_SIZE(&dirbuf)((__builtin_offsetof(struct dirent, d_name) + ((&dirbuf)-> d_namlen) + 1 + 7) &~ 7); |
1629 | dirbuf.d_off = offset + sizeof(struct direntry); |
1630 | if (uio->uio_resid < dirbuf.d_reclen) { |
1631 | brelse(bp); |
1632 | /* Remember long-name offset. */ |
1633 | if (wlast != -1) |
1634 | offset = wlast; |
1635 | goto out; |
1636 | } |
1637 | wlast = -1; |
1638 | error = uiomove(&dirbuf, dirbuf.d_reclen, uio); |
1639 | if (error) { |
1640 | brelse(bp); |
1641 | goto out; |
1642 | } |
1643 | } |
1644 | brelse(bp); |
1645 | } |
1646 | |
1647 | out: |
1648 | uio->uio_offset = offset; |
1649 | uio->uio_resid += lost; |
1650 | if (dep->de_FileSize - (offset - bias) <= 0) |
1651 | *ap->a_eofflag = 1; |
1652 | else |
1653 | *ap->a_eofflag = 0; |
1654 | return (error); |
1655 | } |
1656 | |
1657 | /* |
1658 | * DOS filesystems don't know what symlinks are. |
1659 | */ |
1660 | int |
1661 | msdosfs_readlink(void *v) |
1662 | { |
1663 | #if 0 |
1664 | struct vop_readlink_args /* { |
1665 | struct vnode *a_vp; |
1666 | struct uio *a_uio; |
1667 | struct ucred *a_cred; |
1668 | } */ *ap; |
1669 | #endif |
1670 | |
1671 | return (EINVAL22); |
1672 | } |
1673 | |
1674 | int |
1675 | msdosfs_lock(void *v) |
1676 | { |
1677 | struct vop_lock_args *ap = v; |
1678 | struct vnode *vp = ap->a_vp; |
1679 | |
1680 | return rrw_enter(&VTODE(vp)((struct denode *)(vp)->v_data)->de_lock, ap->a_flags & LK_RWFLAGS(0x0001UL|0x0002UL|0x0040UL|0x0080UL|0x0100UL)); |
1681 | } |
1682 | |
1683 | int |
1684 | msdosfs_unlock(void *v) |
1685 | { |
1686 | struct vop_unlock_args *ap = v; |
1687 | struct vnode *vp = ap->a_vp; |
1688 | |
1689 | rrw_exit(&VTODE(vp)((struct denode *)(vp)->v_data)->de_lock); |
1690 | return 0; |
1691 | } |
1692 | |
1693 | int |
1694 | msdosfs_islocked(void *v) |
1695 | { |
1696 | struct vop_islocked_args *ap = v; |
1697 | |
1698 | return rrw_status(&VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data)->de_lock); |
1699 | } |
1700 | |
1701 | /* |
1702 | * vp - address of vnode file the file |
1703 | * bn - which cluster we are interested in mapping to a filesystem block number |
1704 | * vpp - returns the vnode for the block special file holding the filesystem |
1705 | * containing the file of interest |
1706 | * bnp - address of where to return the filesystem relative block number |
1707 | */ |
1708 | int |
1709 | msdosfs_bmap(void *v) |
1710 | { |
1711 | struct vop_bmap_args *ap = v; |
1712 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
1713 | uint32_t cn; |
1714 | |
1715 | if (ap->a_vpp != NULL((void *)0)) |
1716 | *ap->a_vpp = dep->de_devvp; |
1717 | if (ap->a_bnp == NULL((void *)0)) |
1718 | return (0); |
1719 | |
1720 | cn = ap->a_bn; |
1721 | if (cn != ap->a_bn) |
1722 | return (EFBIG27); |
1723 | |
1724 | return (msdosfs_bmaparray(ap->a_vp, cn, ap->a_bnp, ap->a_runp)); |
1725 | } |
1726 | |
1727 | int |
1728 | msdosfs_bmaparray(struct vnode *vp, uint32_t cn, daddr_t *bnp, int *runp) |
1729 | { |
1730 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
1731 | struct msdosfsmount *pmp = dep->de_pmp; |
1732 | struct mount *mp; |
1733 | int error, maxrun = 0, run; |
1734 | daddr_t runbn; |
1735 | |
1736 | mp = vp->v_mount; |
1737 | |
1738 | if (runp) { |
1739 | /* |
1740 | * XXX |
1741 | * If MAXBSIZE is the largest transfer the disks can handle, |
1742 | * we probably want maxrun to be 1 block less so that we |
1743 | * don't create a block larger than the device can handle. |
1744 | */ |
1745 | *runp = 0; |
1746 | maxrun = min(MAXBSIZE(64 * 1024) / mp->mnt_stat.f_iosize - 1, |
1747 | pmp->pm_maxcluster - cn); |
1748 | } |
1749 | |
1750 | if ((error = pcbmap(dep, cn, bnp, 0, 0)) != 0) |
1751 | return (error); |
1752 | |
1753 | for (run = 1; run <= maxrun; run++) { |
1754 | error = pcbmap(dep, cn + run, &runbn, 0, 0); |
1755 | if (error != 0 || (runbn != *bnp + de_cn2bn(pmp, run)((run) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift) ))) |
1756 | break; |
1757 | } |
1758 | |
1759 | if (runp) |
1760 | *runp = run - 1; |
1761 | |
1762 | return (0); |
1763 | } |
1764 | |
1765 | int |
1766 | msdosfs_strategy(void *v) |
1767 | { |
1768 | struct vop_strategy_args *ap = v; |
1769 | struct buf *bp = ap->a_bp; |
1770 | struct denode *dep = VTODE(bp->b_vp)((struct denode *)(bp->b_vp)->v_data); |
1771 | struct vnode *vp; |
1772 | int error = 0; |
1773 | int s; |
1774 | |
1775 | if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) |
1776 | panic("msdosfs_strategy: spec"); |
1777 | /* |
1778 | * If we don't already know the filesystem relative block number |
1779 | * then get it using pcbmap(). If pcbmap() returns the block |
1780 | * number as -1 then we've got a hole in the file. DOS filesystems |
1781 | * don't allow files with holes, so we shouldn't ever see this. |
1782 | */ |
1783 | if (bp->b_blkno == bp->b_lblkno) { |
1784 | error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); |
1785 | if (error) |
1786 | bp->b_blkno = -1; |
1787 | if (bp->b_blkno == -1) |
1788 | clrbuf(bp){ __builtin_bzero(((bp)->b_data), ((bp)->b_bcount)); (bp )->b_resid = 0; }; |
1789 | } |
1790 | if (bp->b_blkno == -1) { |
1791 | s = splbio()splraise(0x3); |
1792 | biodone(bp); |
1793 | splx(s)spllower(s); |
1794 | return (error); |
1795 | } |
1796 | |
1797 | /* |
1798 | * Read/write the block from/to the disk that contains the desired |
1799 | * file block. |
1800 | */ |
1801 | |
1802 | vp = dep->de_devvp; |
1803 | bp->b_dev = vp->v_rdevv_un.vu_specinfo->si_rdev; |
1804 | VOP_STRATEGY(vp, bp); |
1805 | return (0); |
1806 | } |
1807 | |
1808 | int |
1809 | msdosfs_print(void *v) |
1810 | { |
1811 | struct vop_print_args *ap = v; |
1812 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
1813 | |
1814 | printf( |
1815 | "tag VT_MSDOSFS, startcluster %u, dircluster %u, diroffset %u ", |
1816 | dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); |
1817 | printf(" dev %d, %d, %s\n", |
1818 | major(dep->de_dev)(((unsigned)(dep->de_dev) >> 8) & 0xff), minor(dep->de_dev)((unsigned)((dep->de_dev) & 0xff) | (((dep->de_dev) & 0xffff0000) >> 8)), |
1819 | VOP_ISLOCKED(ap->a_vp) ? "(LOCKED)" : ""); |
1820 | #ifdef DIAGNOSTIC1 |
1821 | printf("\n"); |
1822 | #endif |
1823 | |
1824 | return (0); |
1825 | } |
1826 | |
1827 | int |
1828 | msdosfs_advlock(void *v) |
1829 | { |
1830 | struct vop_advlock_args *ap = v; |
1831 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
1832 | |
1833 | return (lf_advlock(&dep->de_lockf, dep->de_FileSize, ap->a_id, ap->a_op, |
1834 | ap->a_fl, ap->a_flags)); |
1835 | } |
1836 | |
1837 | int |
1838 | msdosfs_pathconf(void *v) |
1839 | { |
1840 | struct vop_pathconf_args *ap = v; |
1841 | struct msdosfsmount *pmp = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data)->de_pmp; |
1842 | int error = 0; |
1843 | |
1844 | switch (ap->a_name) { |
1845 | case _PC_LINK_MAX1: |
1846 | *ap->a_retval = 1; |
1847 | break; |
1848 | case _PC_NAME_MAX4: |
1849 | *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME0x02 ? WIN_MAXLEN255 : 12; |
1850 | break; |
1851 | case _PC_CHOWN_RESTRICTED7: |
1852 | *ap->a_retval = 1; |
1853 | break; |
1854 | case _PC_NO_TRUNC8: |
1855 | *ap->a_retval = 0; |
1856 | break; |
1857 | case _PC_TIMESTAMP_RESOLUTION21: |
1858 | *ap->a_retval = 2000000000; /* 2 billion nanoseconds */ |
1859 | break; |
1860 | default: |
1861 | error = EINVAL22; |
1862 | break; |
1863 | } |
1864 | |
1865 | return (error); |
1866 | } |
1867 | |
1868 | /* |
1869 | * Thomas Wang's hash function, severely hacked to always set the high |
1870 | * bit on the number it returns (so no longer a proper hash function). |
1871 | */ |
1872 | static uint32_t |
1873 | fileidhash(uint64_t fileid) |
1874 | { |
1875 | uint64_t c1 = 0x6e5ea73858134343LL; |
1876 | uint64_t c2 = 0xb34e8f99a2ec9ef5LL; |
1877 | |
1878 | /* |
1879 | * We now have the original fileid value, as 64-bit value. |
1880 | * We need to reduce it to 32-bits, with the top bit set. |
1881 | */ |
1882 | fileid ^= ((c1 ^ fileid) >> 32); |
1883 | fileid *= c1; |
1884 | fileid ^= ((c2 ^ fileid) >> 31); |
1885 | fileid *= c2; |
1886 | fileid ^= ((c1 ^ fileid) >> 32); |
1887 | |
1888 | return (uint32_t)(fileid | 0x80000000); |
1889 | } |
1890 | |
1891 | /* Global vfs data structures for msdosfs */ |
1892 | const struct vops msdosfs_vops = { |
1893 | .vop_lookup = msdosfs_lookup, |
1894 | .vop_create = msdosfs_create, |
1895 | .vop_mknod = msdosfs_mknod, |
1896 | .vop_open = msdosfs_open, |
1897 | .vop_close = msdosfs_close, |
1898 | .vop_access = msdosfs_access, |
1899 | .vop_getattr = msdosfs_getattr, |
1900 | .vop_setattr = msdosfs_setattr, |
1901 | .vop_read = msdosfs_read, |
1902 | .vop_write = msdosfs_write, |
1903 | .vop_ioctl = msdosfs_ioctl, |
1904 | .vop_kqfilter = msdosfs_kqfilter, |
1905 | .vop_fsync = msdosfs_fsync, |
1906 | .vop_remove = msdosfs_remove, |
1907 | .vop_link = msdosfs_link, |
1908 | .vop_rename = msdosfs_rename, |
1909 | .vop_mkdir = msdosfs_mkdir, |
1910 | .vop_rmdir = msdosfs_rmdir, |
1911 | .vop_symlink = msdosfs_symlink, |
1912 | .vop_readdir = msdosfs_readdir, |
1913 | .vop_readlink = msdosfs_readlink, |
1914 | .vop_abortop = vop_generic_abortop, |
1915 | .vop_inactive = msdosfs_inactive, |
1916 | .vop_reclaim = msdosfs_reclaim, |
1917 | .vop_lock = msdosfs_lock, |
1918 | .vop_unlock = msdosfs_unlock, |
1919 | .vop_bmap = msdosfs_bmap, |
1920 | .vop_strategy = msdosfs_strategy, |
1921 | .vop_print = msdosfs_print, |
1922 | .vop_islocked = msdosfs_islocked, |
1923 | .vop_pathconf = msdosfs_pathconf, |
1924 | .vop_advlock = msdosfs_advlock, |
1925 | .vop_bwrite = vop_generic_bwrite, |
1926 | .vop_revoke = vop_generic_revoke, |
1927 | }; |
1928 | |
1929 | const struct filterops msdosfsread_filtops = { |
1930 | .f_flags = FILTEROP_ISFD0x00000001, |
1931 | .f_attach = NULL((void *)0), |
1932 | .f_detach = filt_msdosfsdetach, |
1933 | .f_event = filt_msdosfsread, |
1934 | }; |
1935 | |
1936 | const struct filterops msdosfswrite_filtops = { |
1937 | .f_flags = FILTEROP_ISFD0x00000001, |
1938 | .f_attach = NULL((void *)0), |
1939 | .f_detach = filt_msdosfsdetach, |
1940 | .f_event = filt_msdosfswrite, |
1941 | }; |
1942 | |
1943 | const struct filterops msdosfsvnode_filtops = { |
1944 | .f_flags = FILTEROP_ISFD0x00000001, |
1945 | .f_attach = NULL((void *)0), |
1946 | .f_detach = filt_msdosfsdetach, |
1947 | .f_event = filt_msdosfsvnode, |
1948 | }; |
1949 | |
1950 | int |
1951 | msdosfs_kqfilter(void *v) |
1952 | { |
1953 | struct vop_kqfilter_args *ap = v; |
1954 | struct vnode *vp = ap->a_vp; |
1955 | struct knote *kn = ap->a_kn; |
1956 | |
1957 | switch (kn->kn_filterkn_kevent.filter) { |
1958 | case EVFILT_READ(-1): |
1959 | kn->kn_fop = &msdosfsread_filtops; |
1960 | break; |
1961 | case EVFILT_WRITE(-2): |
1962 | kn->kn_fop = &msdosfswrite_filtops; |
1963 | break; |
1964 | case EVFILT_VNODE(-4): |
1965 | kn->kn_fop = &msdosfsvnode_filtops; |
1966 | break; |
1967 | default: |
1968 | return (EINVAL22); |
1969 | } |
1970 | |
1971 | kn->kn_hook = (caddr_t)vp; |
1972 | |
1973 | klist_insert_locked(&vp->v_klist, kn); |
1974 | |
1975 | return (0); |
1976 | } |
1977 | |
1978 | void |
1979 | filt_msdosfsdetach(struct knote *kn) |
1980 | { |
1981 | struct vnode *vp = (struct vnode *)kn->kn_hook; |
1982 | |
1983 | klist_remove_locked(&vp->v_klist, kn); |
1984 | } |
1985 | |
1986 | int |
1987 | filt_msdosfsread(struct knote *kn, long hint) |
1988 | { |
1989 | struct vnode *vp = (struct vnode *)kn->kn_hook; |
1990 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
1991 | |
1992 | /* |
1993 | * filesystem is gone, so set the EOF flag and schedule |
1994 | * the knote for deletion. |
1995 | */ |
1996 | if (hint == NOTE_REVOKE0x0040) { |
1997 | kn->kn_flagskn_kevent.flags |= (EV_EOF0x8000 | EV_ONESHOT0x0010); |
1998 | return (1); |
1999 | } |
2000 | |
2001 | kn->kn_datakn_kevent.data = dep->de_FileSize - foffset(kn->kn_fpkn_ptr.p_fp); |
2002 | if (kn->kn_datakn_kevent.data == 0 && kn->kn_sfflags & NOTE_EOF0x0002) { |
2003 | kn->kn_fflagskn_kevent.fflags |= NOTE_EOF0x0002; |
2004 | return (1); |
2005 | } |
2006 | |
2007 | if (kn->kn_flagskn_kevent.flags & (__EV_POLL0x1000 | __EV_SELECT0x0800)) |
2008 | return (1); |
2009 | |
2010 | return (kn->kn_datakn_kevent.data != 0); |
2011 | } |
2012 | |
2013 | int |
2014 | filt_msdosfswrite(struct knote *kn, long hint) |
2015 | { |
2016 | /* |
2017 | * filesystem is gone, so set the EOF flag and schedule |
2018 | * the knote for deletion. |
2019 | */ |
2020 | if (hint == NOTE_REVOKE0x0040) { |
2021 | kn->kn_flagskn_kevent.flags |= (EV_EOF0x8000 | EV_ONESHOT0x0010); |
2022 | return (1); |
2023 | } |
2024 | |
2025 | kn->kn_datakn_kevent.data = 0; |
2026 | return (1); |
2027 | } |
2028 | |
2029 | int |
2030 | filt_msdosfsvnode(struct knote *kn, long hint) |
2031 | { |
2032 | if (kn->kn_sfflags & hint) |
2033 | kn->kn_fflagskn_kevent.fflags |= hint; |
2034 | if (hint == NOTE_REVOKE0x0040) { |
2035 | kn->kn_flagskn_kevent.flags |= EV_EOF0x8000; |
2036 | return (1); |
2037 | } |
2038 | return (kn->kn_fflagskn_kevent.fflags != 0); |
2039 | } |