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 | * |
a9194d51 | 7 | * @(#)vfs_vnops.c 7.29 (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 | ||
41 | if (fmode & FCREAT) { | |
42 | ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF; | |
43 | if ((fmode & FEXCL) == 0) | |
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 KM |
52 | return (error); |
53 | fmode &= ~FTRUNC; | |
54 | vp = ndp->ni_vp; | |
55 | } else { | |
3f530a7b KM |
56 | if (ndp->ni_dvp == ndp->ni_vp) |
57 | vrele(ndp->ni_dvp); | |
7341981c | 58 | else |
3f530a7b KM |
59 | vput(ndp->ni_dvp); |
60 | ndp->ni_dvp = NULL; | |
eb668bc6 | 61 | vp = ndp->ni_vp; |
eb668bc6 KM |
62 | if (fmode & FEXCL) { |
63 | error = EEXIST; | |
64 | goto bad; | |
65 | } | |
66 | fmode &= ~FCREAT; | |
67 | } | |
68 | } else { | |
69 | ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF; | |
8429d022 | 70 | if (error = namei(ndp, p)) |
eb668bc6 KM |
71 | return (error); |
72 | vp = ndp->ni_vp; | |
73 | } | |
74 | if (vp->v_type == VSOCK) { | |
75 | error = EOPNOTSUPP; | |
76 | goto bad; | |
77 | } | |
78 | if ((fmode & FCREAT) == 0) { | |
79 | if (fmode & FREAD) { | |
a9194d51 | 80 | if (error = VOP_ACCESS(vp, VREAD, cred, p)) |
eb668bc6 KM |
81 | goto bad; |
82 | } | |
83 | if (fmode & (FWRITE|FTRUNC)) { | |
eb668bc6 KM |
84 | if (vp->v_type == VDIR) { |
85 | error = EISDIR; | |
86 | goto bad; | |
87 | } | |
cd811e9a | 88 | if ((error = vn_writechk(vp)) || |
a9194d51 | 89 | (error = VOP_ACCESS(vp, VWRITE, cred, p))) |
cd811e9a | 90 | goto bad; |
eb668bc6 KM |
91 | } |
92 | } | |
93 | if (fmode & FTRUNC) { | |
3ee1461b | 94 | VATTR_NULL(vap); |
eb668bc6 | 95 | vap->va_size = 0; |
a9194d51 | 96 | if (error = VOP_SETATTR(vp, vap, cred, p)) |
eb668bc6 KM |
97 | goto bad; |
98 | } | |
99 | VOP_UNLOCK(vp); | |
a9194d51 | 100 | error = VOP_OPEN(vp, fmode, cred, p); |
d099f49b KM |
101 | if (error) |
102 | vrele(vp); | |
103 | return (error); | |
eb668bc6 KM |
104 | |
105 | bad: | |
106 | vput(vp); | |
ccee3c59 | 107 | return (error); |
eb668bc6 KM |
108 | } |
109 | ||
110 | /* | |
cd811e9a KM |
111 | * Check for write permissions on the specified vnode. |
112 | * The read-only status of the file system is checked. | |
113 | * Also, prototype text segments cannot be written. | |
eb668bc6 | 114 | */ |
cd811e9a | 115 | vn_writechk(vp) |
eb668bc6 | 116 | register struct vnode *vp; |
fc96c615 | 117 | { |
fc96c615 | 118 | |
cd811e9a KM |
119 | /* |
120 | * Disallow write attempts on read-only file systems; | |
121 | * unless the file is a socket or a block or character | |
122 | * device resident on the file system. | |
123 | */ | |
5216fbe4 KM |
124 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
125 | switch (vp->v_type) { | |
126 | case VREG: case VDIR: case VLNK: | |
127 | return (EROFS); | |
128 | } | |
129 | } | |
cd811e9a KM |
130 | /* |
131 | * If there's shared text associated with | |
132 | * the vnode, try to free it up once. If | |
133 | * we fail, we can't allow writing. | |
134 | */ | |
9db58063 | 135 | if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp)) |
cd811e9a KM |
136 | return (ETXTBSY); |
137 | return (0); | |
eb668bc6 KM |
138 | } |
139 | ||
140 | /* | |
141 | * Vnode version of rdwri() for calls on file systems. | |
142 | */ | |
a9194d51 | 143 | vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) |
eb668bc6 KM |
144 | enum uio_rw rw; |
145 | struct vnode *vp; | |
146 | caddr_t base; | |
147 | int len; | |
148 | off_t offset; | |
149 | enum uio_seg segflg; | |
150 | int ioflg; | |
151 | struct ucred *cred; | |
152 | int *aresid; | |
a9194d51 | 153 | struct proc *p; |
eb668bc6 KM |
154 | { |
155 | struct uio auio; | |
156 | struct iovec aiov; | |
157 | int error; | |
158 | ||
cde34f67 KM |
159 | if ((ioflg & IO_NODELOCKED) == 0) |
160 | VOP_LOCK(vp); | |
eb668bc6 KM |
161 | auio.uio_iov = &aiov; |
162 | auio.uio_iovcnt = 1; | |
163 | aiov.iov_base = base; | |
164 | aiov.iov_len = len; | |
165 | auio.uio_resid = len; | |
166 | auio.uio_offset = offset; | |
167 | auio.uio_segflg = segflg; | |
168 | auio.uio_rw = rw; | |
a9194d51 | 169 | auio.uio_procp = p; |
eb668bc6 | 170 | if (rw == UIO_READ) |
cde34f67 | 171 | error = VOP_READ(vp, &auio, ioflg, cred); |
eb668bc6 | 172 | else |
cde34f67 | 173 | error = VOP_WRITE(vp, &auio, ioflg, cred); |
eb668bc6 KM |
174 | if (aresid) |
175 | *aresid = auio.uio_resid; | |
176 | else | |
177 | if (auio.uio_resid && error == 0) | |
178 | error = EIO; | |
cde34f67 KM |
179 | if ((ioflg & IO_NODELOCKED) == 0) |
180 | VOP_UNLOCK(vp); | |
eb668bc6 KM |
181 | return (error); |
182 | } | |
183 | ||
184 | vn_read(fp, uio, cred) | |
185 | struct file *fp; | |
186 | struct uio *uio; | |
187 | struct ucred *cred; | |
188 | { | |
cde34f67 KM |
189 | register struct vnode *vp = (struct vnode *)fp->f_data; |
190 | int count, error; | |
eb668bc6 | 191 | |
cde34f67 KM |
192 | VOP_LOCK(vp); |
193 | uio->uio_offset = fp->f_offset; | |
194 | count = uio->uio_resid; | |
195 | error = VOP_READ(vp, uio, (fp->f_flag & FNDELAY) ? IO_NDELAY : 0, cred); | |
196 | fp->f_offset += count - uio->uio_resid; | |
197 | VOP_UNLOCK(vp); | |
198 | return (error); | |
eb668bc6 KM |
199 | } |
200 | ||
201 | vn_write(fp, uio, cred) | |
202 | struct file *fp; | |
203 | struct uio *uio; | |
204 | struct ucred *cred; | |
205 | { | |
206 | register struct vnode *vp = (struct vnode *)fp->f_data; | |
cde34f67 | 207 | int count, error, ioflag = 0; |
eb668bc6 KM |
208 | |
209 | if (vp->v_type == VREG && (fp->f_flag & FAPPEND)) | |
210 | ioflag |= IO_APPEND; | |
211 | if (fp->f_flag & FNDELAY) | |
212 | ioflag |= IO_NDELAY; | |
cde34f67 KM |
213 | VOP_LOCK(vp); |
214 | uio->uio_offset = fp->f_offset; | |
215 | count = uio->uio_resid; | |
216 | error = VOP_WRITE(vp, uio, ioflag, cred); | |
217 | if (ioflag & IO_APPEND) | |
218 | fp->f_offset = uio->uio_offset; | |
219 | else | |
220 | fp->f_offset += count - uio->uio_resid; | |
221 | VOP_UNLOCK(vp); | |
222 | return (error); | |
eb668bc6 KM |
223 | } |
224 | ||
225 | /* | |
226 | * Get stat info for a vnode. | |
227 | */ | |
a9194d51 | 228 | vn_stat(vp, sb, p) |
eb668bc6 KM |
229 | struct vnode *vp; |
230 | register struct stat *sb; | |
a9194d51 | 231 | struct proc *p; |
eb668bc6 KM |
232 | { |
233 | struct vattr vattr; | |
234 | register struct vattr *vap; | |
235 | int error; | |
236 | u_short mode; | |
237 | ||
238 | vap = &vattr; | |
a9194d51 | 239 | error = VOP_GETATTR(vp, vap, p->p_ucred, p); |
eb668bc6 KM |
240 | if (error) |
241 | return (error); | |
242 | /* | |
243 | * Copy from vattr table | |
244 | */ | |
245 | sb->st_dev = vap->va_fsid; | |
246 | sb->st_ino = vap->va_fileid; | |
247 | mode = vap->va_mode; | |
248 | switch (vp->v_type) { | |
249 | case VREG: | |
2e3baa4b | 250 | mode |= S_IFREG; |
eb668bc6 KM |
251 | break; |
252 | case VDIR: | |
2e3baa4b | 253 | mode |= S_IFDIR; |
eb668bc6 KM |
254 | break; |
255 | case VBLK: | |
2e3baa4b | 256 | mode |= S_IFBLK; |
eb668bc6 KM |
257 | break; |
258 | case VCHR: | |
2e3baa4b | 259 | mode |= S_IFCHR; |
eb668bc6 KM |
260 | break; |
261 | case VLNK: | |
2e3baa4b | 262 | mode |= S_IFLNK; |
eb668bc6 KM |
263 | break; |
264 | case VSOCK: | |
2e3baa4b | 265 | mode |= S_IFSOCK; |
eb668bc6 | 266 | break; |
0099f400 KM |
267 | case VFIFO: |
268 | mode |= S_IFIFO; | |
269 | break; | |
eb668bc6 KM |
270 | default: |
271 | return (EBADF); | |
272 | }; | |
273 | sb->st_mode = mode; | |
274 | sb->st_nlink = vap->va_nlink; | |
275 | sb->st_uid = vap->va_uid; | |
276 | sb->st_gid = vap->va_gid; | |
277 | sb->st_rdev = vap->va_rdev; | |
278 | sb->st_size = vap->va_size; | |
279 | sb->st_atime = vap->va_atime.tv_sec; | |
280 | sb->st_spare1 = 0; | |
281 | sb->st_mtime = vap->va_mtime.tv_sec; | |
282 | sb->st_spare2 = 0; | |
283 | sb->st_ctime = vap->va_ctime.tv_sec; | |
284 | sb->st_spare3 = 0; | |
285 | sb->st_blksize = vap->va_blocksize; | |
2ff0b8da KM |
286 | sb->st_flags = vap->va_flags; |
287 | sb->st_gen = vap->va_gen; | |
366f2ef0 | 288 | sb->st_blocks = vap->va_bytes / S_BLKSIZE; |
eb668bc6 KM |
289 | return (0); |
290 | } | |
291 | ||
292 | /* | |
293 | * Vnode ioctl call | |
294 | */ | |
a9194d51 | 295 | vn_ioctl(fp, com, data, p) |
eb668bc6 KM |
296 | struct file *fp; |
297 | int com; | |
298 | caddr_t data; | |
a9194d51 | 299 | struct proc *p; |
eb668bc6 KM |
300 | { |
301 | register struct vnode *vp = ((struct vnode *)fp->f_data); | |
302 | struct vattr vattr; | |
303 | int error; | |
304 | ||
305 | switch (vp->v_type) { | |
306 | ||
307 | case VREG: | |
308 | case VDIR: | |
309 | if (com == FIONREAD) { | |
a9194d51 | 310 | if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) |
eb668bc6 KM |
311 | return (error); |
312 | *(off_t *)data = vattr.va_size - fp->f_offset; | |
313 | return (0); | |
314 | } | |
315 | if (com == FIONBIO || com == FIOASYNC) /* XXX */ | |
316 | return (0); /* XXX */ | |
317 | /* fall into ... */ | |
318 | ||
319 | default: | |
320 | return (ENOTTY); | |
321 | ||
0099f400 | 322 | case VFIFO: |
eb668bc6 KM |
323 | case VCHR: |
324 | case VBLK: | |
a9194d51 | 325 | error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); |
1665da5a | 326 | if (error == 0 && com == TIOCSCTTY) { |
8429d022 | 327 | p->p_session->s_ttyvp = vp; |
1665da5a MT |
328 | VREF(vp); |
329 | } | |
330 | return (error); | |
fc96c615 | 331 | } |
eb668bc6 KM |
332 | } |
333 | ||
334 | /* | |
335 | * Vnode select call | |
336 | */ | |
a9194d51 | 337 | vn_select(fp, which, p) |
eb668bc6 KM |
338 | struct file *fp; |
339 | int which; | |
a9194d51 | 340 | struct proc *p; |
eb668bc6 | 341 | { |
8429d022 | 342 | |
ccee3c59 | 343 | return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag, |
a9194d51 | 344 | p->p_ucred, p)); |
eb668bc6 KM |
345 | } |
346 | ||
347 | /* | |
348 | * Vnode close call | |
349 | */ | |
a9194d51 | 350 | vn_close(fp, p) |
eb668bc6 | 351 | register struct file *fp; |
a9194d51 | 352 | struct proc *p; |
eb668bc6 KM |
353 | { |
354 | struct vnode *vp = ((struct vnode *)fp->f_data); | |
355 | int error; | |
356 | ||
40123f2c | 357 | /* |
eb668bc6 KM |
358 | * Must delete vnode reference from this file entry |
359 | * before VOP_CLOSE, so that only other references | |
360 | * will prevent close. | |
40123f2c | 361 | */ |
eb668bc6 | 362 | fp->f_data = (caddr_t) 0; |
a9194d51 | 363 | error = VOP_CLOSE(vp, fp->f_flag, fp->f_cred, p); |
eb668bc6 KM |
364 | vrele(vp); |
365 | return (error); | |
366 | } | |
367 | ||
eb668bc6 KM |
368 | /* |
369 | * vn_fhtovp() - convert a fh to a vnode ptr (optionally locked) | |
370 | * - look up fsid in mount list (if not found ret error) | |
371 | * - get vp by calling VFS_FHTOVP() macro | |
372 | * - if lockflag lock it with VOP_LOCK() | |
373 | */ | |
374 | vn_fhtovp(fhp, lockflag, vpp) | |
375 | fhandle_t *fhp; | |
376 | int lockflag; | |
377 | struct vnode **vpp; | |
378 | { | |
379 | register struct mount *mp; | |
eb668bc6 KM |
380 | |
381 | if ((mp = getvfs(&fhp->fh_fsid)) == NULL) | |
382 | return (ESTALE); | |
a2f658f9 KM |
383 | if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp)) |
384 | return (ESTALE); | |
385 | if (!lockflag) | |
386 | VOP_UNLOCK(*vpp); | |
eb668bc6 KM |
387 | return (0); |
388 | } |