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ca7bd36e WJ |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * @(#)vfs_vnops.c 7.33 (Berkeley) 6/27/91 | |
34 | */ | |
35 | ||
36 | #include "param.h" | |
37 | #include "systm.h" | |
38 | #include "kernel.h" | |
39 | #include "file.h" | |
40 | #include "stat.h" | |
41 | #include "buf.h" | |
42 | #include "proc.h" | |
43 | #include "mount.h" | |
44 | #include "namei.h" | |
45 | #include "vnode.h" | |
46 | #include "ioctl.h" | |
47 | #include "tty.h" | |
48 | ||
49 | struct fileops vnops = | |
50 | { vn_read, vn_write, vn_ioctl, vn_select, vn_closefile }; | |
51 | ||
52 | /* | |
53 | * Common code for vnode open operations. | |
54 | * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. | |
55 | */ | |
56 | vn_open(ndp, p, fmode, cmode) | |
57 | register struct nameidata *ndp; | |
58 | struct proc *p; | |
59 | int fmode, cmode; | |
60 | { | |
61 | register struct vnode *vp; | |
62 | register struct ucred *cred = p->p_ucred; | |
63 | struct vattr vat; | |
64 | struct vattr *vap = &vat; | |
65 | int error; | |
66 | ||
67 | if (fmode & O_CREAT) { | |
68 | ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF; | |
69 | if ((fmode & O_EXCL) == 0) | |
70 | ndp->ni_nameiop |= FOLLOW; | |
71 | if (error = namei(ndp, p)) | |
72 | return (error); | |
73 | if (ndp->ni_vp == NULL) { | |
74 | VATTR_NULL(vap); | |
75 | vap->va_type = VREG; | |
76 | vap->va_mode = cmode; | |
77 | if (error = VOP_CREATE(ndp, vap, p)) | |
78 | return (error); | |
79 | fmode &= ~O_TRUNC; | |
80 | vp = ndp->ni_vp; | |
81 | } else { | |
82 | VOP_ABORTOP(ndp); | |
83 | if (ndp->ni_dvp == ndp->ni_vp) | |
84 | vrele(ndp->ni_dvp); | |
85 | else | |
86 | vput(ndp->ni_dvp); | |
87 | ndp->ni_dvp = NULL; | |
88 | vp = ndp->ni_vp; | |
89 | if (fmode & O_EXCL) { | |
90 | error = EEXIST; | |
91 | goto bad; | |
92 | } | |
93 | fmode &= ~O_CREAT; | |
94 | } | |
95 | } else { | |
96 | ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF; | |
97 | if (error = namei(ndp, p)) | |
98 | return (error); | |
99 | vp = ndp->ni_vp; | |
100 | } | |
101 | if (vp->v_type == VSOCK) { | |
102 | error = EOPNOTSUPP; | |
103 | goto bad; | |
104 | } | |
105 | if ((fmode & O_CREAT) == 0) { | |
106 | if (fmode & FREAD) { | |
107 | if (error = VOP_ACCESS(vp, VREAD, cred, p)) | |
108 | goto bad; | |
109 | } | |
110 | if (fmode & (FWRITE | O_TRUNC)) { | |
111 | if (vp->v_type == VDIR) { | |
112 | error = EISDIR; | |
113 | goto bad; | |
114 | } | |
115 | if ((error = vn_writechk(vp)) || | |
116 | (error = VOP_ACCESS(vp, VWRITE, cred, p))) | |
117 | goto bad; | |
118 | } | |
119 | } | |
120 | if (fmode & O_TRUNC) { | |
121 | VATTR_NULL(vap); | |
122 | vap->va_size = 0; | |
123 | if (error = VOP_SETATTR(vp, vap, cred, p)) | |
124 | goto bad; | |
125 | } | |
126 | if (error = VOP_OPEN(vp, fmode, cred, p)) | |
127 | goto bad; | |
128 | if (fmode & FWRITE) | |
129 | vp->v_writecount++; | |
130 | return (0); | |
131 | bad: | |
132 | vput(vp); | |
133 | return (error); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Check for write permissions on the specified vnode. | |
138 | * The read-only status of the file system is checked. | |
139 | * Also, prototype text segments cannot be written. | |
140 | */ | |
141 | vn_writechk(vp) | |
142 | register struct vnode *vp; | |
143 | { | |
144 | ||
145 | /* | |
146 | * Disallow write attempts on read-only file systems; | |
147 | * unless the file is a socket or a block or character | |
148 | * device resident on the file system. | |
149 | */ | |
150 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { | |
151 | switch (vp->v_type) { | |
152 | case VREG: case VDIR: case VLNK: | |
153 | return (EROFS); | |
154 | } | |
155 | } | |
156 | /* | |
157 | * If there's shared text associated with | |
158 | * the vnode, try to free it up once. If | |
159 | * we fail, we can't allow writing. | |
160 | */ | |
161 | if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp)) | |
162 | return (ETXTBSY); | |
163 | return (0); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Vnode close call | |
168 | */ | |
169 | vn_close(vp, flags, cred, p) | |
170 | register struct vnode *vp; | |
171 | int flags; | |
172 | struct ucred *cred; | |
173 | struct proc *p; | |
174 | { | |
175 | int error; | |
176 | ||
177 | if (flags & FWRITE) | |
178 | vp->v_writecount--; | |
179 | error = VOP_CLOSE(vp, flags, cred, p); | |
180 | vrele(vp); | |
181 | return (error); | |
182 | } | |
183 | ||
184 | /* | |
185 | * Package up an I/O request on a vnode into a uio and do it. | |
186 | * [internal interface to file i/o for kernel only] | |
187 | */ | |
188 | vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) | |
189 | enum uio_rw rw; | |
190 | struct vnode *vp; | |
191 | caddr_t base; | |
192 | int len; | |
193 | off_t offset; | |
194 | enum uio_seg segflg; | |
195 | int ioflg; | |
196 | struct ucred *cred; | |
197 | int *aresid; | |
198 | struct proc *p; | |
199 | { | |
200 | struct uio auio; | |
201 | struct iovec aiov; | |
202 | int error; | |
203 | ||
204 | if ((ioflg & IO_NODELOCKED) == 0) | |
205 | VOP_LOCK(vp); | |
206 | auio.uio_iov = &aiov; | |
207 | auio.uio_iovcnt = 1; | |
208 | aiov.iov_base = base; | |
209 | aiov.iov_len = len; | |
210 | auio.uio_resid = len; | |
211 | auio.uio_offset = offset; | |
212 | auio.uio_segflg = segflg; | |
213 | auio.uio_rw = rw; | |
214 | auio.uio_procp = p; | |
215 | if (rw == UIO_READ) | |
216 | error = VOP_READ(vp, &auio, ioflg, cred); | |
217 | else | |
218 | error = VOP_WRITE(vp, &auio, ioflg, cred); | |
219 | if (aresid) | |
220 | *aresid = auio.uio_resid; | |
221 | else | |
222 | if (auio.uio_resid && error == 0) | |
223 | error = EIO; | |
224 | if ((ioflg & IO_NODELOCKED) == 0) | |
225 | VOP_UNLOCK(vp); | |
226 | return (error); | |
227 | } | |
228 | ||
229 | /* | |
230 | * File table vnode read routine. | |
231 | */ | |
232 | vn_read(fp, uio, cred) | |
233 | struct file *fp; | |
234 | struct uio *uio; | |
235 | struct ucred *cred; | |
236 | { | |
237 | register struct vnode *vp = (struct vnode *)fp->f_data; | |
238 | int count, error; | |
239 | ||
240 | VOP_LOCK(vp); | |
241 | uio->uio_offset = fp->f_offset; | |
242 | count = uio->uio_resid; | |
243 | error = VOP_READ(vp, uio, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, | |
244 | cred); | |
245 | fp->f_offset += count - uio->uio_resid; | |
246 | VOP_UNLOCK(vp); | |
247 | return (error); | |
248 | } | |
249 | ||
250 | /* | |
251 | * File table vnode write routine. | |
252 | */ | |
253 | vn_write(fp, uio, cred) | |
254 | struct file *fp; | |
255 | struct uio *uio; | |
256 | struct ucred *cred; | |
257 | { | |
258 | register struct vnode *vp = (struct vnode *)fp->f_data; | |
259 | int count, error, ioflag = 0; | |
260 | ||
261 | if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) | |
262 | ioflag |= IO_APPEND; | |
263 | if (fp->f_flag & FNONBLOCK) | |
264 | ioflag |= IO_NDELAY; | |
265 | VOP_LOCK(vp); | |
266 | uio->uio_offset = fp->f_offset; | |
267 | count = uio->uio_resid; | |
268 | error = VOP_WRITE(vp, uio, ioflag, cred); | |
269 | if (ioflag & IO_APPEND) | |
270 | fp->f_offset = uio->uio_offset; | |
271 | else | |
272 | fp->f_offset += count - uio->uio_resid; | |
273 | VOP_UNLOCK(vp); | |
274 | return (error); | |
275 | } | |
276 | ||
277 | /* | |
278 | * File table vnode stat routine. | |
279 | */ | |
280 | vn_stat(vp, sb, p) | |
281 | struct vnode *vp; | |
282 | register struct stat *sb; | |
283 | struct proc *p; | |
284 | { | |
285 | struct vattr vattr; | |
286 | register struct vattr *vap; | |
287 | int error; | |
288 | u_short mode; | |
289 | ||
290 | vap = &vattr; | |
291 | error = VOP_GETATTR(vp, vap, p->p_ucred, p); | |
292 | if (error) | |
293 | return (error); | |
294 | /* | |
295 | * Copy from vattr table | |
296 | */ | |
297 | sb->st_dev = vap->va_fsid; | |
298 | sb->st_ino = vap->va_fileid; | |
299 | mode = vap->va_mode; | |
300 | switch (vp->v_type) { | |
301 | case VREG: | |
302 | mode |= S_IFREG; | |
303 | break; | |
304 | case VDIR: | |
305 | mode |= S_IFDIR; | |
306 | break; | |
307 | case VBLK: | |
308 | mode |= S_IFBLK; | |
309 | break; | |
310 | case VCHR: | |
311 | mode |= S_IFCHR; | |
312 | break; | |
313 | case VLNK: | |
314 | mode |= S_IFLNK; | |
315 | break; | |
316 | case VSOCK: | |
317 | mode |= S_IFSOCK; | |
318 | break; | |
319 | case VFIFO: | |
320 | mode |= S_IFIFO; | |
321 | break; | |
322 | default: | |
323 | return (EBADF); | |
324 | }; | |
325 | sb->st_mode = mode; | |
326 | sb->st_nlink = vap->va_nlink; | |
327 | sb->st_uid = vap->va_uid; | |
328 | sb->st_gid = vap->va_gid; | |
329 | sb->st_rdev = vap->va_rdev; | |
330 | sb->st_size = vap->va_size; | |
331 | sb->st_atime = vap->va_atime.tv_sec; | |
332 | sb->st_spare1 = 0; | |
333 | sb->st_mtime = vap->va_mtime.tv_sec; | |
334 | sb->st_spare2 = 0; | |
335 | sb->st_ctime = vap->va_ctime.tv_sec; | |
336 | sb->st_spare3 = 0; | |
337 | sb->st_blksize = vap->va_blocksize; | |
338 | sb->st_flags = vap->va_flags; | |
339 | sb->st_gen = vap->va_gen; | |
340 | sb->st_blocks = vap->va_bytes / S_BLKSIZE; | |
341 | return (0); | |
342 | } | |
343 | ||
344 | /* | |
345 | * File table vnode ioctl routine. | |
346 | */ | |
347 | vn_ioctl(fp, com, data, p) | |
348 | struct file *fp; | |
349 | int com; | |
350 | caddr_t data; | |
351 | struct proc *p; | |
352 | { | |
353 | register struct vnode *vp = ((struct vnode *)fp->f_data); | |
354 | struct vattr vattr; | |
355 | int error; | |
356 | ||
357 | switch (vp->v_type) { | |
358 | ||
359 | case VREG: | |
360 | case VDIR: | |
361 | if (com == FIONREAD) { | |
362 | if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) | |
363 | return (error); | |
364 | *(off_t *)data = vattr.va_size - fp->f_offset; | |
365 | return (0); | |
366 | } | |
367 | if (com == FIONBIO || com == FIOASYNC) /* XXX */ | |
368 | return (0); /* XXX */ | |
369 | /* fall into ... */ | |
370 | ||
371 | default: | |
372 | return (ENOTTY); | |
373 | ||
374 | case VFIFO: | |
375 | case VCHR: | |
376 | case VBLK: | |
377 | error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); | |
378 | if (error == 0 && com == TIOCSCTTY) { | |
379 | p->p_session->s_ttyvp = vp; | |
380 | VREF(vp); | |
381 | } | |
382 | return (error); | |
383 | } | |
384 | } | |
385 | ||
386 | /* | |
387 | * File table vnode select routine. | |
388 | */ | |
389 | vn_select(fp, which, p) | |
390 | struct file *fp; | |
391 | int which; | |
392 | struct proc *p; | |
393 | { | |
394 | ||
395 | return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag, | |
396 | fp->f_cred, p)); | |
397 | } | |
398 | ||
399 | /* | |
400 | * File table vnode close routine. | |
401 | */ | |
402 | vn_closefile(fp, p) | |
403 | struct file *fp; | |
404 | struct proc *p; | |
405 | { | |
406 | ||
407 | return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, | |
408 | fp->f_cred, p)); | |
409 | } | |
410 | ||
411 | /* | |
412 | * vn_fhtovp() - convert a fh to a vnode ptr (optionally locked) | |
413 | * - look up fsid in mount list (if not found ret error) | |
414 | * - get vp by calling VFS_FHTOVP() macro | |
415 | * - if lockflag lock it with VOP_LOCK() | |
416 | */ | |
417 | vn_fhtovp(fhp, lockflag, vpp) | |
418 | fhandle_t *fhp; | |
419 | int lockflag; | |
420 | struct vnode **vpp; | |
421 | { | |
422 | register struct mount *mp; | |
423 | ||
424 | if ((mp = getvfs(&fhp->fh_fsid)) == NULL) | |
425 | return (ESTALE); | |
426 | if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp)) | |
427 | return (ESTALE); | |
428 | if (!lockflag) | |
429 | VOP_UNLOCK(*vpp); | |
430 | return (0); | |
431 | } |