Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
eb668bc6 KM |
2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
3 | * All rights reserved. | |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
eb668bc6 | 6 | * |
63992c37 | 7 | * @(#)vfs_vnops.c 7.31 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
961945a8 | 9 | |
94368568 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
eb668bc6 | 12 | #include "kernel.h" |
94368568 | 13 | #include "file.h" |
eb668bc6 KM |
14 | #include "stat.h" |
15 | #include "buf.h" | |
16 | #include "proc.h" | |
eb668bc6 | 17 | #include "mount.h" |
a9194d51 | 18 | #include "namei.h" |
eb668bc6 | 19 | #include "vnode.h" |
eb668bc6 KM |
20 | #include "ioctl.h" |
21 | #include "tty.h" | |
fc96c615 | 22 | |
eb668bc6 KM |
23 | struct fileops vnops = |
24 | { vn_read, vn_write, vn_ioctl, vn_select, vn_close }; | |
d301d150 | 25 | |
fc96c615 | 26 | /* |
eb668bc6 KM |
27 | * Common code for vnode open operations. |
28 | * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. | |
fc96c615 | 29 | */ |
8429d022 | 30 | vn_open(ndp, p, fmode, cmode) |
eb668bc6 | 31 | register struct nameidata *ndp; |
8429d022 | 32 | struct proc *p; |
eb668bc6 KM |
33 | int fmode, cmode; |
34 | { | |
35 | register struct vnode *vp; | |
8429d022 | 36 | register struct ucred *cred = p->p_ucred; |
eb668bc6 KM |
37 | struct vattr vat; |
38 | struct vattr *vap = &vat; | |
39 | int error; | |
40 | ||
63992c37 | 41 | if (fmode & O_CREAT) { |
eb668bc6 | 42 | ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF; |
63992c37 | 43 | if ((fmode & O_EXCL) == 0) |
eb668bc6 | 44 | ndp->ni_nameiop |= FOLLOW; |
8429d022 | 45 | if (error = namei(ndp, p)) |
eb668bc6 KM |
46 | return (error); |
47 | if (ndp->ni_vp == NULL) { | |
3ee1461b | 48 | VATTR_NULL(vap); |
eb668bc6 KM |
49 | vap->va_type = VREG; |
50 | vap->va_mode = cmode; | |
a9194d51 | 51 | if (error = VOP_CREATE(ndp, vap, p)) |
eb668bc6 | 52 | return (error); |
63992c37 | 53 | fmode &= ~O_TRUNC; |
eb668bc6 KM |
54 | vp = ndp->ni_vp; |
55 | } else { | |
e4a57ff3 | 56 | VOP_ABORTOP(ndp); |
3f530a7b KM |
57 | if (ndp->ni_dvp == ndp->ni_vp) |
58 | vrele(ndp->ni_dvp); | |
7341981c | 59 | else |
3f530a7b KM |
60 | vput(ndp->ni_dvp); |
61 | ndp->ni_dvp = NULL; | |
eb668bc6 | 62 | vp = ndp->ni_vp; |
63992c37 | 63 | if (fmode & O_EXCL) { |
eb668bc6 KM |
64 | error = EEXIST; |
65 | goto bad; | |
66 | } | |
63992c37 | 67 | fmode &= ~O_CREAT; |
eb668bc6 KM |
68 | } |
69 | } else { | |
70 | ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF; | |
8429d022 | 71 | if (error = namei(ndp, p)) |
eb668bc6 KM |
72 | return (error); |
73 | vp = ndp->ni_vp; | |
74 | } | |
75 | if (vp->v_type == VSOCK) { | |
76 | error = EOPNOTSUPP; | |
77 | goto bad; | |
78 | } | |
63992c37 | 79 | if ((fmode & O_CREAT) == 0) { |
eb668bc6 | 80 | if (fmode & FREAD) { |
a9194d51 | 81 | if (error = VOP_ACCESS(vp, VREAD, cred, p)) |
eb668bc6 KM |
82 | goto bad; |
83 | } | |
63992c37 | 84 | if (fmode & (FWRITE | O_TRUNC)) { |
eb668bc6 KM |
85 | if (vp->v_type == VDIR) { |
86 | error = EISDIR; | |
87 | goto bad; | |
88 | } | |
cd811e9a | 89 | if ((error = vn_writechk(vp)) || |
a9194d51 | 90 | (error = VOP_ACCESS(vp, VWRITE, cred, p))) |
cd811e9a | 91 | goto bad; |
eb668bc6 KM |
92 | } |
93 | } | |
63992c37 | 94 | if (fmode & O_TRUNC) { |
3ee1461b | 95 | VATTR_NULL(vap); |
eb668bc6 | 96 | vap->va_size = 0; |
a9194d51 | 97 | if (error = VOP_SETATTR(vp, vap, cred, p)) |
eb668bc6 KM |
98 | goto bad; |
99 | } | |
63992c37 KM |
100 | if ((error = VOP_OPEN(vp, fmode, cred, p)) == 0) |
101 | return (0); | |
eb668bc6 KM |
102 | bad: |
103 | vput(vp); | |
ccee3c59 | 104 | return (error); |
eb668bc6 KM |
105 | } |
106 | ||
107 | /* | |
cd811e9a KM |
108 | * Check for write permissions on the specified vnode. |
109 | * The read-only status of the file system is checked. | |
110 | * Also, prototype text segments cannot be written. | |
eb668bc6 | 111 | */ |
cd811e9a | 112 | vn_writechk(vp) |
eb668bc6 | 113 | register struct vnode *vp; |
fc96c615 | 114 | { |
fc96c615 | 115 | |
cd811e9a KM |
116 | /* |
117 | * Disallow write attempts on read-only file systems; | |
118 | * unless the file is a socket or a block or character | |
119 | * device resident on the file system. | |
120 | */ | |
5216fbe4 KM |
121 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
122 | switch (vp->v_type) { | |
123 | case VREG: case VDIR: case VLNK: | |
124 | return (EROFS); | |
125 | } | |
126 | } | |
cd811e9a KM |
127 | /* |
128 | * If there's shared text associated with | |
129 | * the vnode, try to free it up once. If | |
130 | * we fail, we can't allow writing. | |
131 | */ | |
9db58063 | 132 | if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp)) |
cd811e9a KM |
133 | return (ETXTBSY); |
134 | return (0); | |
eb668bc6 KM |
135 | } |
136 | ||
137 | /* | |
138 | * Vnode version of rdwri() for calls on file systems. | |
139 | */ | |
a9194d51 | 140 | vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) |
eb668bc6 KM |
141 | enum uio_rw rw; |
142 | struct vnode *vp; | |
143 | caddr_t base; | |
144 | int len; | |
145 | off_t offset; | |
146 | enum uio_seg segflg; | |
147 | int ioflg; | |
148 | struct ucred *cred; | |
149 | int *aresid; | |
a9194d51 | 150 | struct proc *p; |
eb668bc6 KM |
151 | { |
152 | struct uio auio; | |
153 | struct iovec aiov; | |
154 | int error; | |
155 | ||
cde34f67 KM |
156 | if ((ioflg & IO_NODELOCKED) == 0) |
157 | VOP_LOCK(vp); | |
eb668bc6 KM |
158 | auio.uio_iov = &aiov; |
159 | auio.uio_iovcnt = 1; | |
160 | aiov.iov_base = base; | |
161 | aiov.iov_len = len; | |
162 | auio.uio_resid = len; | |
163 | auio.uio_offset = offset; | |
164 | auio.uio_segflg = segflg; | |
165 | auio.uio_rw = rw; | |
a9194d51 | 166 | auio.uio_procp = p; |
eb668bc6 | 167 | if (rw == UIO_READ) |
cde34f67 | 168 | error = VOP_READ(vp, &auio, ioflg, cred); |
eb668bc6 | 169 | else |
cde34f67 | 170 | error = VOP_WRITE(vp, &auio, ioflg, cred); |
eb668bc6 KM |
171 | if (aresid) |
172 | *aresid = auio.uio_resid; | |
173 | else | |
174 | if (auio.uio_resid && error == 0) | |
175 | error = EIO; | |
cde34f67 KM |
176 | if ((ioflg & IO_NODELOCKED) == 0) |
177 | VOP_UNLOCK(vp); | |
eb668bc6 KM |
178 | return (error); |
179 | } | |
180 | ||
181 | vn_read(fp, uio, cred) | |
182 | struct file *fp; | |
183 | struct uio *uio; | |
184 | struct ucred *cred; | |
185 | { | |
cde34f67 KM |
186 | register struct vnode *vp = (struct vnode *)fp->f_data; |
187 | int count, error; | |
eb668bc6 | 188 | |
cde34f67 KM |
189 | VOP_LOCK(vp); |
190 | uio->uio_offset = fp->f_offset; | |
191 | count = uio->uio_resid; | |
63992c37 KM |
192 | error = VOP_READ(vp, uio, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, |
193 | cred); | |
cde34f67 KM |
194 | fp->f_offset += count - uio->uio_resid; |
195 | VOP_UNLOCK(vp); | |
196 | return (error); | |
eb668bc6 KM |
197 | } |
198 | ||
199 | vn_write(fp, uio, cred) | |
200 | struct file *fp; | |
201 | struct uio *uio; | |
202 | struct ucred *cred; | |
203 | { | |
204 | register struct vnode *vp = (struct vnode *)fp->f_data; | |
cde34f67 | 205 | int count, error, ioflag = 0; |
eb668bc6 | 206 | |
63992c37 | 207 | if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) |
eb668bc6 | 208 | ioflag |= IO_APPEND; |
63992c37 | 209 | if (fp->f_flag & FNONBLOCK) |
eb668bc6 | 210 | ioflag |= IO_NDELAY; |
cde34f67 KM |
211 | VOP_LOCK(vp); |
212 | uio->uio_offset = fp->f_offset; | |
213 | count = uio->uio_resid; | |
214 | error = VOP_WRITE(vp, uio, ioflag, cred); | |
215 | if (ioflag & IO_APPEND) | |
216 | fp->f_offset = uio->uio_offset; | |
217 | else | |
218 | fp->f_offset += count - uio->uio_resid; | |
219 | VOP_UNLOCK(vp); | |
220 | return (error); | |
eb668bc6 KM |
221 | } |
222 | ||
223 | /* | |
224 | * Get stat info for a vnode. | |
225 | */ | |
a9194d51 | 226 | vn_stat(vp, sb, p) |
eb668bc6 KM |
227 | struct vnode *vp; |
228 | register struct stat *sb; | |
a9194d51 | 229 | struct proc *p; |
eb668bc6 KM |
230 | { |
231 | struct vattr vattr; | |
232 | register struct vattr *vap; | |
233 | int error; | |
234 | u_short mode; | |
235 | ||
236 | vap = &vattr; | |
a9194d51 | 237 | error = VOP_GETATTR(vp, vap, p->p_ucred, p); |
eb668bc6 KM |
238 | if (error) |
239 | return (error); | |
240 | /* | |
241 | * Copy from vattr table | |
242 | */ | |
243 | sb->st_dev = vap->va_fsid; | |
244 | sb->st_ino = vap->va_fileid; | |
245 | mode = vap->va_mode; | |
246 | switch (vp->v_type) { | |
247 | case VREG: | |
2e3baa4b | 248 | mode |= S_IFREG; |
eb668bc6 KM |
249 | break; |
250 | case VDIR: | |
2e3baa4b | 251 | mode |= S_IFDIR; |
eb668bc6 KM |
252 | break; |
253 | case VBLK: | |
2e3baa4b | 254 | mode |= S_IFBLK; |
eb668bc6 KM |
255 | break; |
256 | case VCHR: | |
2e3baa4b | 257 | mode |= S_IFCHR; |
eb668bc6 KM |
258 | break; |
259 | case VLNK: | |
2e3baa4b | 260 | mode |= S_IFLNK; |
eb668bc6 KM |
261 | break; |
262 | case VSOCK: | |
2e3baa4b | 263 | mode |= S_IFSOCK; |
eb668bc6 | 264 | break; |
0099f400 KM |
265 | case VFIFO: |
266 | mode |= S_IFIFO; | |
267 | break; | |
eb668bc6 KM |
268 | default: |
269 | return (EBADF); | |
270 | }; | |
271 | sb->st_mode = mode; | |
272 | sb->st_nlink = vap->va_nlink; | |
273 | sb->st_uid = vap->va_uid; | |
274 | sb->st_gid = vap->va_gid; | |
275 | sb->st_rdev = vap->va_rdev; | |
276 | sb->st_size = vap->va_size; | |
277 | sb->st_atime = vap->va_atime.tv_sec; | |
278 | sb->st_spare1 = 0; | |
279 | sb->st_mtime = vap->va_mtime.tv_sec; | |
280 | sb->st_spare2 = 0; | |
281 | sb->st_ctime = vap->va_ctime.tv_sec; | |
282 | sb->st_spare3 = 0; | |
283 | sb->st_blksize = vap->va_blocksize; | |
2ff0b8da KM |
284 | sb->st_flags = vap->va_flags; |
285 | sb->st_gen = vap->va_gen; | |
366f2ef0 | 286 | sb->st_blocks = vap->va_bytes / S_BLKSIZE; |
eb668bc6 KM |
287 | return (0); |
288 | } | |
289 | ||
290 | /* | |
291 | * Vnode ioctl call | |
292 | */ | |
a9194d51 | 293 | vn_ioctl(fp, com, data, p) |
eb668bc6 KM |
294 | struct file *fp; |
295 | int com; | |
296 | caddr_t data; | |
a9194d51 | 297 | struct proc *p; |
eb668bc6 KM |
298 | { |
299 | register struct vnode *vp = ((struct vnode *)fp->f_data); | |
300 | struct vattr vattr; | |
301 | int error; | |
302 | ||
303 | switch (vp->v_type) { | |
304 | ||
305 | case VREG: | |
306 | case VDIR: | |
307 | if (com == FIONREAD) { | |
a9194d51 | 308 | if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) |
eb668bc6 KM |
309 | return (error); |
310 | *(off_t *)data = vattr.va_size - fp->f_offset; | |
311 | return (0); | |
312 | } | |
313 | if (com == FIONBIO || com == FIOASYNC) /* XXX */ | |
314 | return (0); /* XXX */ | |
315 | /* fall into ... */ | |
316 | ||
317 | default: | |
318 | return (ENOTTY); | |
319 | ||
0099f400 | 320 | case VFIFO: |
eb668bc6 KM |
321 | case VCHR: |
322 | case VBLK: | |
a9194d51 | 323 | error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); |
1665da5a | 324 | if (error == 0 && com == TIOCSCTTY) { |
8429d022 | 325 | p->p_session->s_ttyvp = vp; |
1665da5a MT |
326 | VREF(vp); |
327 | } | |
328 | return (error); | |
fc96c615 | 329 | } |
eb668bc6 KM |
330 | } |
331 | ||
332 | /* | |
333 | * Vnode select call | |
334 | */ | |
a9194d51 | 335 | vn_select(fp, which, p) |
eb668bc6 KM |
336 | struct file *fp; |
337 | int which; | |
a9194d51 | 338 | struct proc *p; |
eb668bc6 | 339 | { |
8429d022 | 340 | |
ccee3c59 | 341 | return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag, |
a9194d51 | 342 | p->p_ucred, p)); |
eb668bc6 KM |
343 | } |
344 | ||
345 | /* | |
346 | * Vnode close call | |
347 | */ | |
a9194d51 | 348 | vn_close(fp, p) |
eb668bc6 | 349 | register struct file *fp; |
a9194d51 | 350 | struct proc *p; |
eb668bc6 KM |
351 | { |
352 | struct vnode *vp = ((struct vnode *)fp->f_data); | |
353 | int error; | |
354 | ||
40123f2c | 355 | /* |
eb668bc6 KM |
356 | * Must delete vnode reference from this file entry |
357 | * before VOP_CLOSE, so that only other references | |
358 | * will prevent close. | |
40123f2c | 359 | */ |
eb668bc6 | 360 | fp->f_data = (caddr_t) 0; |
a9194d51 | 361 | error = VOP_CLOSE(vp, fp->f_flag, fp->f_cred, p); |
eb668bc6 KM |
362 | vrele(vp); |
363 | return (error); | |
364 | } | |
365 | ||
eb668bc6 KM |
366 | /* |
367 | * vn_fhtovp() - convert a fh to a vnode ptr (optionally locked) | |
368 | * - look up fsid in mount list (if not found ret error) | |
369 | * - get vp by calling VFS_FHTOVP() macro | |
370 | * - if lockflag lock it with VOP_LOCK() | |
371 | */ | |
372 | vn_fhtovp(fhp, lockflag, vpp) | |
373 | fhandle_t *fhp; | |
374 | int lockflag; | |
375 | struct vnode **vpp; | |
376 | { | |
377 | register struct mount *mp; | |
eb668bc6 KM |
378 | |
379 | if ((mp = getvfs(&fhp->fh_fsid)) == NULL) | |
380 | return (ESTALE); | |
a2f658f9 KM |
381 | if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp)) |
382 | return (ESTALE); | |
383 | if (!lockflag) | |
384 | VOP_UNLOCK(*vpp); | |
eb668bc6 KM |
385 | return (0); |
386 | } |