Commit | Line | Data |
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a1fa407d JSP |
1 | /* |
2 | * Copyright (c) 1992, 1993, 1994 The Regents of the University of California. | |
3 | * Copyright (c) 1992, 1993, 1994 Jan-Simon Pendry. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
12abe7b1 | 7 | * Jan-Simon Pendry. |
a1fa407d JSP |
8 | * |
9 | * %sccs.include.redist.c% | |
10 | * | |
ed5969c8 | 11 | * @(#)union_vnops.c 1.7 (Berkeley) %G% |
a1fa407d JSP |
12 | */ |
13 | ||
14 | #include <sys/param.h> | |
15 | #include <sys/systm.h> | |
16 | #include <sys/proc.h> | |
17 | #include <sys/file.h> | |
a1fa407d JSP |
18 | #include <sys/time.h> |
19 | #include <sys/types.h> | |
20 | #include <sys/vnode.h> | |
21 | #include <sys/mount.h> | |
22 | #include <sys/namei.h> | |
23 | #include <sys/malloc.h> | |
24 | #include <sys/buf.h> | |
25 | #include "union.h" | |
26 | ||
a1fa407d | 27 | static int |
79f80c71 JSP |
28 | union_lookup1(udvp, dvp, vpp, cnp) |
29 | struct vnode *udvp; | |
a1fa407d JSP |
30 | struct vnode *dvp; |
31 | struct vnode **vpp; | |
32 | struct componentname *cnp; | |
33 | { | |
34 | int error; | |
35 | struct vnode *tdvp; | |
36 | struct mount *mp; | |
37 | ||
81be6ee0 JSP |
38 | /* |
39 | * If stepping up the directory tree, check for going | |
40 | * back across the mount point, in which case do what | |
41 | * lookup would do by stepping back down the mount | |
42 | * hierarchy. | |
43 | */ | |
a1fa407d JSP |
44 | if (cnp->cn_flags & ISDOTDOT) { |
45 | for (;;) { | |
46 | if ((dvp->v_flag & VROOT) == 0 || | |
47 | (cnp->cn_flags & NOCROSSMOUNT)) | |
48 | break; | |
49 | ||
50 | tdvp = dvp; | |
51 | dvp = dvp->v_mount->mnt_vnodecovered; | |
52 | vput(tdvp); | |
53 | VREF(dvp); | |
54 | VOP_LOCK(dvp); | |
55 | } | |
56 | } | |
ed5969c8 | 57 | |
a1fa407d JSP |
58 | error = VOP_LOOKUP(dvp, &tdvp, cnp); |
59 | if (error) | |
60 | return (error); | |
61 | ||
81be6ee0 | 62 | /* |
ed5969c8 JSP |
63 | * The parent directory will have been unlocked, unless lookup |
64 | * found the last component. In which case, re-lock the node | |
65 | * here to allow it to be unlocked again (phew) in union_lookup. | |
81be6ee0 | 66 | */ |
ed5969c8 | 67 | if (dvp != tdvp && !(cnp->cn_flags & ISLASTCN)) |
81be6ee0 JSP |
68 | VOP_LOCK(dvp); |
69 | ||
a1fa407d | 70 | dvp = tdvp; |
81be6ee0 JSP |
71 | |
72 | /* | |
73 | * Lastly check if the current node is a mount point in | |
74 | * which cse walk up the mount hierarchy making sure not to | |
75 | * bump into the root of the mount tree (ie. dvp != udvp). | |
76 | */ | |
79f80c71 JSP |
77 | while (dvp != udvp && (dvp->v_type == VDIR) && |
78 | (mp = dvp->v_mountedhere) && | |
a1fa407d JSP |
79 | (cnp->cn_flags & NOCROSSMOUNT) == 0) { |
80 | ||
81 | if (mp->mnt_flag & MNT_MLOCK) { | |
82 | mp->mnt_flag |= MNT_MWAIT; | |
83 | sleep((caddr_t) mp, PVFS); | |
84 | continue; | |
85 | } | |
86 | ||
87 | if (error = VFS_ROOT(mp, &tdvp)) { | |
88 | vput(dvp); | |
89 | return (error); | |
90 | } | |
91 | ||
01dac67e | 92 | vput(dvp); |
a1fa407d JSP |
93 | dvp = tdvp; |
94 | } | |
95 | ||
96 | *vpp = dvp; | |
97 | return (0); | |
98 | } | |
99 | ||
100 | int | |
101 | union_lookup(ap) | |
102 | struct vop_lookup_args /* { | |
103 | struct vnodeop_desc *a_desc; | |
104 | struct vnode *a_dvp; | |
105 | struct vnode **a_vpp; | |
106 | struct componentname *a_cnp; | |
107 | } */ *ap; | |
108 | { | |
01dac67e | 109 | int error; |
a1fa407d JSP |
110 | int uerror, lerror; |
111 | struct vnode *uppervp, *lowervp; | |
112 | struct vnode *upperdvp, *lowerdvp; | |
113 | struct vnode *dvp = ap->a_dvp; | |
79f80c71 | 114 | struct union_node *dun = VTOUNION(dvp); |
a1fa407d JSP |
115 | struct componentname *cnp = ap->a_cnp; |
116 | int lockparent = cnp->cn_flags & LOCKPARENT; | |
81be6ee0 | 117 | int rdonly = cnp->cn_flags & RDONLY; |
3b293975 | 118 | struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount); |
a1fa407d | 119 | |
01dac67e JSP |
120 | cnp->cn_flags |= LOCKPARENT; |
121 | ||
a1fa407d JSP |
122 | upperdvp = dun->un_uppervp; |
123 | lowerdvp = dun->un_lowervp; | |
3b293975 JSP |
124 | uppervp = NULLVP; |
125 | lowervp = NULLVP; | |
a1fa407d JSP |
126 | |
127 | /* | |
128 | * do the lookup in the upper level. | |
129 | * if that level comsumes additional pathnames, | |
130 | * then assume that something special is going | |
131 | * on and just return that vnode. | |
132 | */ | |
a1fa407d | 133 | if (upperdvp) { |
01dac67e | 134 | VOP_LOCK(upperdvp); |
3b293975 JSP |
135 | uerror = union_lookup1(um->um_uppervp, upperdvp, |
136 | &uppervp, cnp); | |
79f80c71 JSP |
137 | if (uppervp != upperdvp) |
138 | VOP_UNLOCK(upperdvp); | |
01dac67e | 139 | |
a1fa407d JSP |
140 | if (cnp->cn_consume != 0) { |
141 | *ap->a_vpp = uppervp; | |
01dac67e JSP |
142 | if (!lockparent) |
143 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
144 | return (uerror); |
145 | } | |
a1fa407d JSP |
146 | } else { |
147 | uerror = ENOENT; | |
148 | } | |
149 | ||
150 | /* | |
151 | * in a similar way to the upper layer, do the lookup | |
152 | * in the lower layer. this time, if there is some | |
153 | * component magic going on, then vput whatever we got | |
154 | * back from the upper layer and return the lower vnode | |
155 | * instead. | |
156 | */ | |
a1fa407d | 157 | if (lowerdvp) { |
01dac67e | 158 | VOP_LOCK(lowerdvp); |
3b293975 JSP |
159 | lerror = union_lookup1(um->um_lowervp, lowerdvp, |
160 | &lowervp, cnp); | |
79f80c71 JSP |
161 | if (lowervp != lowerdvp) |
162 | VOP_UNLOCK(lowerdvp); | |
01dac67e | 163 | |
a1fa407d JSP |
164 | if (cnp->cn_consume != 0) { |
165 | if (uppervp) { | |
166 | vput(uppervp); | |
3b293975 | 167 | uppervp = NULLVP; |
a1fa407d JSP |
168 | } |
169 | *ap->a_vpp = lowervp; | |
01dac67e JSP |
170 | if (!lockparent) |
171 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
172 | return (lerror); |
173 | } | |
a1fa407d JSP |
174 | } else { |
175 | lerror = ENOENT; | |
176 | } | |
177 | ||
01dac67e JSP |
178 | if (!lockparent) |
179 | cnp->cn_flags &= ~LOCKPARENT; | |
180 | ||
a1fa407d JSP |
181 | /* |
182 | * at this point, we have uerror and lerror indicating | |
183 | * possible errors with the lookups in the upper and lower | |
184 | * layers. additionally, uppervp and lowervp are (locked) | |
185 | * references to existing vnodes in the upper and lower layers. | |
186 | * | |
187 | * there are now three cases to consider. | |
188 | * 1. if both layers returned an error, then return whatever | |
189 | * error the upper layer generated. | |
190 | * | |
191 | * 2. if the top layer failed and the bottom layer succeeded | |
192 | * then two subcases occur. | |
193 | * a. the bottom vnode is not a directory, in which | |
194 | * case just return a new union vnode referencing | |
195 | * an empty top layer and the existing bottom layer. | |
196 | * b. the bottom vnode is a directory, in which case | |
197 | * create a new directory in the top-level and | |
198 | * continue as in case 3. | |
199 | * | |
200 | * 3. if the top layer succeeded then return a new union | |
201 | * vnode referencing whatever the new top layer and | |
202 | * whatever the bottom layer returned. | |
203 | */ | |
204 | ||
ed5969c8 JSP |
205 | *ap->a_vpp = NULLVP; |
206 | ||
a1fa407d JSP |
207 | /* case 1. */ |
208 | if ((uerror != 0) && (lerror != 0)) { | |
a1fa407d JSP |
209 | return (uerror); |
210 | } | |
211 | ||
212 | /* case 2. */ | |
213 | if (uerror != 0 /* && (lerror == 0) */ ) { | |
214 | if (lowervp->v_type == VDIR) { /* case 2b. */ | |
3b293975 | 215 | uerror = union_mkshadow(um, upperdvp, cnp, &uppervp); |
a1fa407d JSP |
216 | if (uerror) { |
217 | if (lowervp) { | |
218 | vput(lowervp); | |
3b293975 | 219 | lowervp = NULLVP; |
a1fa407d JSP |
220 | } |
221 | return (uerror); | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
01dac67e JSP |
226 | if (uppervp) |
227 | VOP_UNLOCK(uppervp); | |
228 | if (lowervp) | |
229 | VOP_UNLOCK(lowervp); | |
230 | ||
3b293975 JSP |
231 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
232 | uppervp, lowervp); | |
233 | ||
01dac67e JSP |
234 | if (error) { |
235 | if (uppervp) | |
236 | vrele(uppervp); | |
237 | if (lowervp) | |
238 | vrele(lowervp); | |
239 | } else { | |
81be6ee0 JSP |
240 | if (*ap->a_vpp != dvp) |
241 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
242 | VOP_UNLOCK(dvp); | |
01dac67e JSP |
243 | } |
244 | ||
245 | return (error); | |
a1fa407d JSP |
246 | } |
247 | ||
12abe7b1 JSP |
248 | int |
249 | union_create(ap) | |
250 | struct vop_create_args /* { | |
251 | struct vnode *a_dvp; | |
252 | struct vnode **a_vpp; | |
253 | struct componentname *a_cnp; | |
254 | struct vattr *a_vap; | |
255 | } */ *ap; | |
256 | { | |
257 | struct union_node *un = VTOUNION(ap->a_dvp); | |
258 | struct vnode *dvp = un->un_uppervp; | |
259 | ||
260 | if (dvp) { | |
261 | int error; | |
262 | struct vnode *vp; | |
12abe7b1 JSP |
263 | |
264 | VREF(dvp); | |
265 | VOP_LOCK(dvp); | |
266 | vput(ap->a_dvp); | |
267 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
268 | if (error) | |
269 | return (error); | |
270 | ||
3b293975 JSP |
271 | VOP_UNLOCK(vp); |
272 | ||
12abe7b1 JSP |
273 | error = union_allocvp( |
274 | ap->a_vpp, | |
79f80c71 JSP |
275 | ap->a_dvp->v_mount, |
276 | ap->a_dvp, | |
01dac67e | 277 | NULLVP, |
12abe7b1 JSP |
278 | ap->a_cnp, |
279 | vp, | |
280 | NULLVP); | |
01dac67e JSP |
281 | if (error) |
282 | vrele(vp); | |
12abe7b1 JSP |
283 | return (error); |
284 | } | |
285 | ||
286 | vput(ap->a_dvp); | |
287 | return (EROFS); | |
288 | } | |
289 | ||
290 | int | |
291 | union_mknod(ap) | |
292 | struct vop_mknod_args /* { | |
293 | struct vnode *a_dvp; | |
294 | struct vnode **a_vpp; | |
295 | struct componentname *a_cnp; | |
296 | struct vattr *a_vap; | |
297 | } */ *ap; | |
298 | { | |
299 | struct union_node *un = VTOUNION(ap->a_dvp); | |
300 | struct vnode *dvp = un->un_uppervp; | |
301 | ||
302 | if (dvp) { | |
303 | int error; | |
304 | struct vnode *vp; | |
12abe7b1 JSP |
305 | |
306 | VREF(dvp); | |
307 | VOP_LOCK(dvp); | |
308 | vput(ap->a_dvp); | |
309 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
310 | if (error) | |
311 | return (error); | |
312 | ||
01dac67e | 313 | if (vp) { |
3b293975 JSP |
314 | VOP_UNLOCK(vp); |
315 | ||
01dac67e JSP |
316 | error = union_allocvp( |
317 | ap->a_vpp, | |
79f80c71 JSP |
318 | ap->a_dvp->v_mount, |
319 | ap->a_dvp, | |
01dac67e JSP |
320 | NULLVP, |
321 | ap->a_cnp, | |
322 | vp, | |
323 | NULLVP); | |
01dac67e JSP |
324 | if (error) |
325 | vrele(vp); | |
326 | } | |
12abe7b1 JSP |
327 | return (error); |
328 | } | |
329 | ||
330 | vput(ap->a_dvp); | |
331 | return (EROFS); | |
332 | } | |
333 | ||
a1fa407d JSP |
334 | int |
335 | union_open(ap) | |
336 | struct vop_open_args /* { | |
337 | struct vnodeop_desc *a_desc; | |
338 | struct vnode *a_vp; | |
339 | int a_mode; | |
340 | struct ucred *a_cred; | |
341 | struct proc *a_p; | |
342 | } */ *ap; | |
343 | { | |
344 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 345 | struct vnode *tvp; |
a1fa407d JSP |
346 | int mode = ap->a_mode; |
347 | struct ucred *cred = ap->a_cred; | |
348 | struct proc *p = ap->a_p; | |
01dac67e | 349 | int error; |
a1fa407d JSP |
350 | |
351 | /* | |
352 | * If there is an existing upper vp then simply open that. | |
353 | */ | |
01dac67e JSP |
354 | tvp = un->un_uppervp; |
355 | if (tvp == NULLVP) { | |
a1fa407d | 356 | /* |
01dac67e JSP |
357 | * If the lower vnode is being opened for writing, then |
358 | * copy the file contents to the upper vnode and open that, | |
359 | * otherwise can simply open the lower vnode. | |
a1fa407d | 360 | */ |
01dac67e JSP |
361 | tvp = un->un_lowervp; |
362 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
81be6ee0 | 363 | struct vnode *vp; |
3b293975 | 364 | int i; |
01dac67e JSP |
365 | |
366 | /* | |
367 | * Open the named file in the upper layer. Note that | |
368 | * the file may have come into existence *since* the | |
369 | * lookup was done, since the upper layer may really | |
370 | * be a loopback mount of some other filesystem... | |
371 | * so open the file with exclusive create and barf if | |
372 | * it already exists. | |
ed5969c8 | 373 | * XXX - perhaps should re-lookup the node (once more |
01dac67e JSP |
374 | * with feeling) and simply open that. Who knows. |
375 | */ | |
3b293975 | 376 | error = union_vn_create(&vp, un, p); |
01dac67e JSP |
377 | if (error) |
378 | return (error); | |
81be6ee0 | 379 | un->un_uppervp = vp; /* XXX */ |
01dac67e JSP |
380 | /* at this point, uppervp is locked */ |
381 | ||
382 | /* | |
383 | * Now, if the file is being opened with truncation, | |
384 | * then the (new) upper vnode is ready to fly, | |
385 | * otherwise the data from the lower vnode must be | |
386 | * copied to the upper layer first. This only works | |
387 | * for regular files (check is made above). | |
388 | */ | |
389 | if ((mode & O_TRUNC) == 0) { | |
390 | /* | |
391 | * XXX - should not ignore errors | |
392 | * from VOP_CLOSE | |
393 | */ | |
81be6ee0 | 394 | VOP_LOCK(tvp); |
01dac67e JSP |
395 | error = VOP_OPEN(tvp, FREAD, cred, p); |
396 | if (error == 0) { | |
397 | error = union_copyfile(p, cred, | |
398 | tvp, un->un_uppervp); | |
399 | VOP_UNLOCK(tvp); | |
400 | (void) VOP_CLOSE(tvp, FREAD); | |
401 | } else { | |
402 | VOP_UNLOCK(tvp); | |
403 | } | |
404 | VOP_UNLOCK(un->un_uppervp); | |
ed5969c8 | 405 | union_vn_close(un->un_uppervp, FWRITE); |
01dac67e | 406 | VOP_LOCK(un->un_uppervp); |
3b293975 | 407 | if (!error) |
ed5969c8 | 408 | uprintf("union: copied up %s\n", |
3b293975 JSP |
409 | un->un_path); |
410 | } | |
411 | ||
412 | /* | |
413 | * Subsequent IOs will go to the top layer, so | |
414 | * call close on the lower vnode and open on the | |
415 | * upper vnode to ensure that the filesystem keeps | |
416 | * its references counts right. This doesn't do | |
417 | * the right thing with (cred) and (FREAD) though. | |
418 | * Ignoring error returns is not righ, either. | |
419 | */ | |
ed5969c8 | 420 | for (i = 0; i < un->un_openl; i++) { |
3b293975 JSP |
421 | (void) VOP_CLOSE(tvp, FREAD); |
422 | (void) VOP_OPEN(un->un_uppervp, FREAD, cred, p); | |
a1fa407d | 423 | } |
ed5969c8 | 424 | un->un_openl = 0; |
3b293975 | 425 | |
01dac67e JSP |
426 | if (error == 0) |
427 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
12abe7b1 | 428 | VOP_UNLOCK(un->un_uppervp); |
01dac67e | 429 | return (error); |
a1fa407d | 430 | } |
ed5969c8 | 431 | un->un_openl++; |
a1fa407d JSP |
432 | } |
433 | ||
01dac67e JSP |
434 | VOP_LOCK(tvp); |
435 | error = VOP_OPEN(tvp, mode, cred, p); | |
436 | VOP_UNLOCK(tvp); | |
437 | ||
438 | return (error); | |
a1fa407d JSP |
439 | } |
440 | ||
12abe7b1 JSP |
441 | int |
442 | union_close(ap) | |
443 | struct vop_close_args /* { | |
444 | struct vnode *a_vp; | |
445 | int a_fflag; | |
446 | struct ucred *a_cred; | |
447 | struct proc *a_p; | |
448 | } */ *ap; | |
449 | { | |
3b293975 JSP |
450 | struct union_node *un = VTOUNION(ap->a_vp); |
451 | struct vnode *vp; | |
12abe7b1 | 452 | |
3b293975 JSP |
453 | if (un->un_uppervp) { |
454 | vp = un->un_uppervp; | |
455 | } else { | |
ed5969c8 JSP |
456 | #ifdef UNION_DIAGNOSTIC |
457 | if (un->un_openl <= 0) | |
458 | panic("union: un_openl cnt"); | |
3b293975 | 459 | #endif |
ed5969c8 | 460 | --un->un_openl; |
3b293975 JSP |
461 | vp = un->un_lowervp; |
462 | } | |
ed5969c8 | 463 | |
3b293975 | 464 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
465 | } |
466 | ||
467 | /* | |
468 | * Check access permission on the union vnode. | |
469 | * The access check being enforced is to check | |
470 | * against both the underlying vnode, and any | |
471 | * copied vnode. This ensures that no additional | |
472 | * file permissions are given away simply because | |
473 | * the user caused an implicit file copy. | |
474 | */ | |
475 | int | |
476 | union_access(ap) | |
477 | struct vop_access_args /* { | |
478 | struct vnodeop_desc *a_desc; | |
479 | struct vnode *a_vp; | |
480 | int a_mode; | |
481 | struct ucred *a_cred; | |
482 | struct proc *a_p; | |
483 | } */ *ap; | |
484 | { | |
485 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 486 | int error = 0; |
12abe7b1 JSP |
487 | struct vnode *vp; |
488 | ||
489 | if (vp = un->un_lowervp) { | |
01dac67e | 490 | VOP_LOCK(vp); |
12abe7b1 | 491 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
01dac67e | 492 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
493 | if (error) |
494 | return (error); | |
495 | } | |
496 | ||
01dac67e JSP |
497 | if (vp = un->un_uppervp) { |
498 | VOP_LOCK(vp); | |
499 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); | |
500 | VOP_UNLOCK(vp); | |
501 | } | |
502 | ||
503 | return (error); | |
12abe7b1 JSP |
504 | } |
505 | ||
a1fa407d JSP |
506 | /* |
507 | * We handle getattr only to change the fsid. | |
508 | */ | |
509 | int | |
510 | union_getattr(ap) | |
511 | struct vop_getattr_args /* { | |
512 | struct vnode *a_vp; | |
513 | struct vattr *a_vap; | |
514 | struct ucred *a_cred; | |
515 | struct proc *a_p; | |
516 | } */ *ap; | |
517 | { | |
518 | int error; | |
01dac67e JSP |
519 | struct vnode *vp = OTHERVP(ap->a_vp); |
520 | ||
521 | VOP_LOCK(vp); | |
522 | error = VOP_GETATTR(vp, ap->a_vap, ap->a_cred, ap->a_p); | |
523 | VOP_UNLOCK(vp); | |
a1fa407d | 524 | |
a1fa407d JSP |
525 | /* Requires that arguments be restored. */ |
526 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; | |
527 | return (0); | |
528 | } | |
529 | ||
a1fa407d | 530 | int |
01dac67e | 531 | union_setattr(ap) |
12abe7b1 | 532 | struct vop_setattr_args /* { |
a1fa407d | 533 | struct vnode *a_vp; |
12abe7b1 | 534 | struct vattr *a_vap; |
a1fa407d | 535 | struct ucred *a_cred; |
12abe7b1 | 536 | struct proc *a_p; |
a1fa407d JSP |
537 | } */ *ap; |
538 | { | |
539 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 540 | int error; |
a1fa407d | 541 | |
12abe7b1 JSP |
542 | if (un->un_uppervp) { |
543 | VOP_LOCK(un->un_uppervp); | |
544 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, | |
545 | ap->a_cred, ap->a_p); | |
546 | VOP_UNLOCK(un->un_uppervp); | |
547 | } else { | |
548 | /* | |
549 | * XXX should do a copyfile (perhaps only if | |
550 | * the file permission change, which would not | |
551 | * track va_ctime correctly). | |
552 | */ | |
553 | error = EROFS; | |
554 | } | |
a1fa407d | 555 | |
12abe7b1 | 556 | return (error); |
a1fa407d JSP |
557 | } |
558 | ||
559 | int | |
12abe7b1 JSP |
560 | union_read(ap) |
561 | struct vop_read_args /* { | |
a1fa407d | 562 | struct vnode *a_vp; |
12abe7b1 JSP |
563 | struct uio *a_uio; |
564 | int a_ioflag; | |
565 | struct ucred *a_cred; | |
a1fa407d JSP |
566 | } */ *ap; |
567 | { | |
12abe7b1 JSP |
568 | int error; |
569 | struct vnode *vp = OTHERVP(ap->a_vp); | |
a1fa407d | 570 | |
01dac67e | 571 | VOP_LOCK(vp); |
12abe7b1 | 572 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
01dac67e | 573 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
574 | |
575 | return (error); | |
a1fa407d JSP |
576 | } |
577 | ||
578 | int | |
12abe7b1 JSP |
579 | union_write(ap) |
580 | struct vop_read_args /* { | |
a1fa407d | 581 | struct vnode *a_vp; |
12abe7b1 JSP |
582 | struct uio *a_uio; |
583 | int a_ioflag; | |
584 | struct ucred *a_cred; | |
a1fa407d JSP |
585 | } */ *ap; |
586 | { | |
12abe7b1 JSP |
587 | int error; |
588 | struct vnode *vp = OTHERVP(ap->a_vp); | |
a1fa407d | 589 | |
12abe7b1 JSP |
590 | VOP_LOCK(vp); |
591 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); | |
592 | VOP_UNLOCK(vp); | |
a1fa407d | 593 | |
12abe7b1 JSP |
594 | return (error); |
595 | } | |
a1fa407d JSP |
596 | |
597 | int | |
12abe7b1 JSP |
598 | union_ioctl(ap) |
599 | struct vop_ioctl_args /* { | |
a1fa407d | 600 | struct vnode *a_vp; |
12abe7b1 JSP |
601 | int a_command; |
602 | caddr_t a_data; | |
603 | int a_fflag; | |
604 | struct ucred *a_cred; | |
605 | struct proc *a_p; | |
a1fa407d JSP |
606 | } */ *ap; |
607 | { | |
a1fa407d | 608 | |
12abe7b1 JSP |
609 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
610 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
611 | } |
612 | ||
a1fa407d | 613 | int |
12abe7b1 JSP |
614 | union_select(ap) |
615 | struct vop_select_args /* { | |
616 | struct vnode *a_vp; | |
617 | int a_which; | |
618 | int a_fflags; | |
619 | struct ucred *a_cred; | |
620 | struct proc *a_p; | |
621 | } */ *ap; | |
622 | { | |
623 | ||
624 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
625 | ap->a_cred, ap->a_p)); | |
626 | } | |
627 | ||
628 | int | |
629 | union_mmap(ap) | |
630 | struct vop_mmap_args /* { | |
631 | struct vnode *a_vp; | |
632 | int a_fflags; | |
633 | struct ucred *a_cred; | |
634 | struct proc *a_p; | |
635 | } */ *ap; | |
636 | { | |
637 | ||
638 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
639 | ap->a_cred, ap->a_p)); | |
640 | } | |
641 | ||
642 | int | |
643 | union_fsync(ap) | |
644 | struct vop_fsync_args /* { | |
645 | struct vnode *a_vp; | |
646 | struct ucred *a_cred; | |
647 | int a_waitfor; | |
648 | struct proc *a_p; | |
649 | } */ *ap; | |
650 | { | |
651 | int error = 0; | |
652 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
653 | ||
654 | if (targetvp) { | |
655 | VOP_LOCK(targetvp); | |
656 | error = VOP_FSYNC(targetvp, ap->a_cred, | |
657 | ap->a_waitfor, ap->a_p); | |
658 | VOP_UNLOCK(targetvp); | |
659 | } | |
660 | ||
661 | return (error); | |
662 | } | |
663 | ||
664 | int | |
665 | union_seek(ap) | |
666 | struct vop_seek_args /* { | |
667 | struct vnode *a_vp; | |
668 | off_t a_oldoff; | |
669 | off_t a_newoff; | |
670 | struct ucred *a_cred; | |
671 | } */ *ap; | |
672 | { | |
673 | ||
674 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
675 | } | |
676 | ||
677 | int | |
678 | union_remove(ap) | |
679 | struct vop_remove_args /* { | |
680 | struct vnode *a_dvp; | |
681 | struct vnode *a_vp; | |
682 | struct componentname *a_cnp; | |
a1fa407d JSP |
683 | } */ *ap; |
684 | { | |
a1fa407d | 685 | int error; |
12abe7b1 JSP |
686 | struct union_node *dun = VTOUNION(ap->a_dvp); |
687 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 688 | |
12abe7b1 JSP |
689 | if (dun->un_uppervp && un->un_uppervp) { |
690 | struct vnode *dvp = dun->un_uppervp; | |
691 | struct vnode *vp = un->un_uppervp; | |
a1fa407d | 692 | |
12abe7b1 JSP |
693 | VREF(dvp); |
694 | VOP_LOCK(dvp); | |
695 | vput(ap->a_dvp); | |
696 | VREF(vp); | |
697 | VOP_LOCK(vp); | |
698 | vput(ap->a_vp); | |
a1fa407d | 699 | |
12abe7b1 | 700 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
701 | if (!error) |
702 | union_removed_upper(un); | |
703 | ||
704 | /* | |
705 | * XXX: should create a whiteout here | |
706 | */ | |
12abe7b1 JSP |
707 | } else { |
708 | /* | |
709 | * XXX: should create a whiteout here | |
710 | */ | |
711 | vput(ap->a_dvp); | |
712 | vput(ap->a_vp); | |
713 | error = EROFS; | |
714 | } | |
715 | ||
716 | return (error); | |
717 | } | |
718 | ||
719 | int | |
720 | union_link(ap) | |
721 | struct vop_link_args /* { | |
722 | struct vnode *a_vp; | |
723 | struct vnode *a_tdvp; | |
724 | struct componentname *a_cnp; | |
725 | } */ *ap; | |
726 | { | |
727 | int error; | |
728 | struct union_node *dun = VTOUNION(ap->a_vp); | |
729 | struct union_node *un = VTOUNION(ap->a_tdvp); | |
730 | ||
731 | if (dun->un_uppervp && un->un_uppervp) { | |
732 | struct vnode *dvp = dun->un_uppervp; | |
733 | struct vnode *vp = un->un_uppervp; | |
734 | ||
735 | VREF(dvp); | |
736 | VOP_LOCK(dvp); | |
737 | vput(ap->a_vp); | |
738 | VREF(vp); | |
739 | vrele(ap->a_tdvp); | |
740 | ||
741 | error = VOP_LINK(dvp, vp, ap->a_cnp); | |
742 | } else { | |
743 | /* | |
744 | * XXX: need to copy to upper layer | |
745 | * and do the link there. | |
746 | */ | |
747 | vput(ap->a_vp); | |
748 | vrele(ap->a_tdvp); | |
749 | error = EROFS; | |
750 | } | |
a1fa407d JSP |
751 | |
752 | return (error); | |
753 | } | |
754 | ||
12abe7b1 JSP |
755 | int |
756 | union_rename(ap) | |
757 | struct vop_rename_args /* { | |
758 | struct vnode *a_fdvp; | |
759 | struct vnode *a_fvp; | |
760 | struct componentname *a_fcnp; | |
761 | struct vnode *a_tdvp; | |
762 | struct vnode *a_tvp; | |
763 | struct componentname *a_tcnp; | |
764 | } */ *ap; | |
765 | { | |
766 | int error; | |
767 | ||
768 | struct vnode *fdvp = ap->a_fdvp; | |
769 | struct vnode *fvp = ap->a_fvp; | |
770 | struct vnode *tdvp = ap->a_tdvp; | |
771 | struct vnode *tvp = ap->a_tvp; | |
772 | ||
773 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
774 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 775 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
776 | error = EROFS; |
777 | goto bad; | |
778 | } | |
779 | ||
780 | fdvp = un->un_uppervp; | |
781 | VREF(fdvp); | |
782 | vrele(ap->a_fdvp); | |
783 | } | |
784 | ||
785 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
786 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 787 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
788 | error = EROFS; |
789 | goto bad; | |
790 | } | |
791 | ||
792 | fvp = un->un_uppervp; | |
793 | VREF(fvp); | |
794 | vrele(ap->a_fvp); | |
795 | } | |
796 | ||
797 | if (tdvp->v_op == union_vnodeop_p) { | |
798 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 799 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
800 | error = EROFS; |
801 | goto bad; | |
802 | } | |
803 | ||
804 | tdvp = un->un_uppervp; | |
805 | VREF(tdvp); | |
806 | VOP_LOCK(tdvp); | |
3b293975 | 807 | vput(ap->a_tdvp); |
12abe7b1 JSP |
808 | } |
809 | ||
810 | if (tvp && tvp->v_op == union_vnodeop_p) { | |
811 | struct union_node *un = VTOUNION(tvp); | |
3b293975 | 812 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
813 | error = EROFS; |
814 | goto bad; | |
815 | } | |
816 | ||
817 | tvp = un->un_uppervp; | |
818 | VREF(tvp); | |
819 | VOP_LOCK(tvp); | |
820 | vput(ap->a_tvp); | |
821 | } | |
822 | ||
823 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
824 | ||
825 | bad: | |
826 | vrele(fdvp); | |
827 | vrele(fvp); | |
828 | vput(tdvp); | |
829 | if (tvp) | |
830 | vput(tvp); | |
831 | ||
832 | return (error); | |
833 | } | |
834 | ||
835 | int | |
836 | union_mkdir(ap) | |
837 | struct vop_mkdir_args /* { | |
838 | struct vnode *a_dvp; | |
839 | struct vnode **a_vpp; | |
840 | struct componentname *a_cnp; | |
841 | struct vattr *a_vap; | |
842 | } */ *ap; | |
843 | { | |
844 | struct union_node *un = VTOUNION(ap->a_dvp); | |
845 | struct vnode *dvp = un->un_uppervp; | |
846 | ||
847 | if (dvp) { | |
848 | int error; | |
849 | struct vnode *vp; | |
12abe7b1 JSP |
850 | |
851 | VREF(dvp); | |
852 | VOP_LOCK(dvp); | |
853 | vput(ap->a_dvp); | |
854 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); | |
855 | if (error) | |
856 | return (error); | |
857 | ||
3b293975 | 858 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
859 | error = union_allocvp( |
860 | ap->a_vpp, | |
79f80c71 JSP |
861 | ap->a_dvp->v_mount, |
862 | ap->a_dvp, | |
01dac67e | 863 | NULLVP, |
12abe7b1 JSP |
864 | ap->a_cnp, |
865 | vp, | |
866 | NULLVP); | |
01dac67e JSP |
867 | if (error) |
868 | vrele(vp); | |
12abe7b1 JSP |
869 | return (error); |
870 | } | |
871 | ||
872 | vput(ap->a_dvp); | |
873 | return (EROFS); | |
874 | } | |
875 | ||
876 | int | |
877 | union_rmdir(ap) | |
878 | struct vop_rmdir_args /* { | |
879 | struct vnode *a_dvp; | |
880 | struct vnode *a_vp; | |
881 | struct componentname *a_cnp; | |
882 | } */ *ap; | |
883 | { | |
884 | int error; | |
885 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
886 | struct union_node *un = VTOUNION(ap->a_vp); | |
887 | ||
888 | if (dun->un_uppervp && un->un_uppervp) { | |
889 | struct vnode *dvp = dun->un_uppervp; | |
890 | struct vnode *vp = un->un_uppervp; | |
891 | ||
892 | VREF(dvp); | |
893 | VOP_LOCK(dvp); | |
894 | vput(ap->a_dvp); | |
895 | VREF(vp); | |
896 | VOP_LOCK(vp); | |
897 | vput(ap->a_vp); | |
898 | ||
899 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); | |
ed5969c8 JSP |
900 | if (!error) |
901 | union_removed_upper(un); | |
902 | ||
903 | /* | |
904 | * XXX: should create a whiteout here | |
905 | */ | |
12abe7b1 JSP |
906 | } else { |
907 | /* | |
908 | * XXX: should create a whiteout here | |
909 | */ | |
910 | vput(ap->a_dvp); | |
911 | vput(ap->a_vp); | |
912 | error = EROFS; | |
913 | } | |
914 | ||
915 | return (error); | |
916 | } | |
917 | ||
918 | int | |
919 | union_symlink(ap) | |
920 | struct vop_symlink_args /* { | |
921 | struct vnode *a_dvp; | |
922 | struct vnode **a_vpp; | |
923 | struct componentname *a_cnp; | |
924 | struct vattr *a_vap; | |
925 | char *a_target; | |
926 | } */ *ap; | |
927 | { | |
928 | struct union_node *un = VTOUNION(ap->a_dvp); | |
929 | struct vnode *dvp = un->un_uppervp; | |
930 | ||
931 | if (dvp) { | |
932 | int error; | |
933 | struct vnode *vp; | |
934 | struct mount *mp = ap->a_dvp->v_mount; | |
935 | ||
936 | VREF(dvp); | |
937 | VOP_LOCK(dvp); | |
938 | vput(ap->a_dvp); | |
939 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
940 | ap->a_vap, ap->a_target); | |
3b293975 | 941 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
942 | return (error); |
943 | } | |
944 | ||
945 | vput(ap->a_dvp); | |
946 | return (EROFS); | |
947 | } | |
a1fa407d JSP |
948 | |
949 | /* | |
12abe7b1 JSP |
950 | * union_readdir works in concert with getdirentries and |
951 | * readdir(3) to provide a list of entries in the unioned | |
952 | * directories. getdirentries is responsible for walking | |
953 | * down the union stack. readdir(3) is responsible for | |
954 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
955 | */ |
956 | int | |
12abe7b1 JSP |
957 | union_readdir(ap) |
958 | struct vop_readdir_args /* { | |
959 | struct vnodeop_desc *a_desc; | |
960 | struct vnode *a_vp; | |
961 | struct uio *a_uio; | |
962 | struct ucred *a_cred; | |
963 | } */ *ap; | |
964 | { | |
965 | int error = 0; | |
966 | struct union_node *un = VTOUNION(ap->a_vp); | |
967 | ||
968 | if (un->un_uppervp) { | |
969 | struct vnode *vp = OTHERVP(ap->a_vp); | |
970 | ||
971 | VOP_LOCK(vp); | |
972 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); | |
973 | VOP_UNLOCK(vp); | |
974 | } | |
975 | ||
976 | return (error); | |
977 | } | |
978 | ||
979 | int | |
980 | union_readlink(ap) | |
981 | struct vop_readlink_args /* { | |
982 | struct vnode *a_vp; | |
983 | struct uio *a_uio; | |
984 | struct ucred *a_cred; | |
a1fa407d JSP |
985 | } */ *ap; |
986 | { | |
a1fa407d | 987 | int error; |
12abe7b1 | 988 | struct vnode *vp = OTHERVP(ap->a_vp); |
a1fa407d | 989 | |
12abe7b1 JSP |
990 | VOP_LOCK(vp); |
991 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); | |
992 | VOP_UNLOCK(vp); | |
a1fa407d | 993 | |
12abe7b1 JSP |
994 | return (error); |
995 | } | |
a1fa407d | 996 | |
12abe7b1 JSP |
997 | int |
998 | union_abortop(ap) | |
999 | struct vop_abortop_args /* { | |
1000 | struct vnode *a_dvp; | |
1001 | struct componentname *a_cnp; | |
1002 | } */ *ap; | |
1003 | { | |
1004 | int error; | |
01dac67e | 1005 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1006 | struct union_node *un = VTOUNION(ap->a_dvp); |
1007 | int islocked = un->un_flags & UN_LOCKED; | |
a1fa407d | 1008 | |
12abe7b1 JSP |
1009 | if (islocked) |
1010 | VOP_LOCK(vp); | |
1011 | error = VOP_ABORTOP(vp, ap->a_cnp); | |
1012 | if (islocked) | |
1013 | VOP_UNLOCK(vp); | |
a1fa407d JSP |
1014 | |
1015 | return (error); | |
1016 | } | |
1017 | ||
12abe7b1 JSP |
1018 | int |
1019 | union_inactive(ap) | |
1020 | struct vop_inactive_args /* { | |
1021 | struct vnode *a_vp; | |
1022 | } */ *ap; | |
1023 | { | |
1024 | ||
1025 | /* | |
1026 | * Do nothing (and _don't_ bypass). | |
1027 | * Wait to vrele lowervp until reclaim, | |
1028 | * so that until then our union_node is in the | |
1029 | * cache and reusable. | |
1030 | * | |
1031 | * NEEDSWORK: Someday, consider inactive'ing | |
1032 | * the lowervp and then trying to reactivate it | |
1033 | * with capabilities (v_id) | |
1034 | * like they do in the name lookup cache code. | |
1035 | * That's too much work for now. | |
1036 | */ | |
79f80c71 | 1037 | |
ed5969c8 | 1038 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1039 | struct union_node *un = VTOUNION(ap->a_vp); |
1040 | ||
1041 | if (un->un_flags & UN_LOCKED) | |
1042 | panic("union: inactivating locked node"); | |
1043 | #endif | |
1044 | ||
12abe7b1 JSP |
1045 | return (0); |
1046 | } | |
1047 | ||
1048 | int | |
1049 | union_reclaim(ap) | |
1050 | struct vop_reclaim_args /* { | |
1051 | struct vnode *a_vp; | |
1052 | } */ *ap; | |
1053 | { | |
1054 | struct vnode *vp = ap->a_vp; | |
1055 | struct union_node *un = VTOUNION(vp); | |
1056 | struct vnode *uppervp = un->un_uppervp; | |
1057 | struct vnode *lowervp = un->un_lowervp; | |
1058 | struct vnode *dirvp = un->un_dirvp; | |
1059 | char *path = un->un_path; | |
1060 | ||
1061 | /* | |
1062 | * Note: in vop_reclaim, vp->v_op == dead_vnodeop_p, | |
1063 | * so we can't call VOPs on ourself. | |
1064 | */ | |
1065 | /* After this assignment, this node will not be re-used. */ | |
3b293975 JSP |
1066 | un->un_uppervp = NULLVP; |
1067 | un->un_lowervp = NULLVP; | |
1068 | un->un_dirvp = NULLVP; | |
12abe7b1 JSP |
1069 | un->un_path = NULL; |
1070 | union_freevp(vp); | |
1071 | if (uppervp) | |
1072 | vrele(uppervp); | |
1073 | if (lowervp) | |
1074 | vrele(lowervp); | |
1075 | if (dirvp) | |
1076 | vrele(dirvp); | |
1077 | if (path) | |
1078 | free(path, M_TEMP); | |
1079 | return (0); | |
1080 | } | |
1081 | ||
a1fa407d JSP |
1082 | int |
1083 | union_lock(ap) | |
1084 | struct vop_lock_args *ap; | |
1085 | { | |
1086 | struct union_node *un = VTOUNION(ap->a_vp); | |
1087 | ||
01dac67e | 1088 | while (un->un_flags & UN_LOCKED) { |
a1fa407d | 1089 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1090 | if (curproc && un->un_pid == curproc->p_pid && |
1091 | un->un_pid > -1 && curproc->p_pid > -1) | |
1092 | panic("union: locking against myself"); | |
a1fa407d | 1093 | #endif |
a1fa407d JSP |
1094 | un->un_flags |= UN_WANT; |
1095 | sleep((caddr_t) &un->un_flags, PINOD); | |
1096 | } | |
1097 | un->un_flags |= UN_LOCKED; | |
79f80c71 | 1098 | |
a1fa407d | 1099 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1100 | if (curproc) |
1101 | un->un_pid = curproc->p_pid; | |
1102 | else | |
1103 | un->un_pid = -1; | |
a1fa407d | 1104 | #endif |
a1fa407d JSP |
1105 | } |
1106 | ||
1107 | int | |
1108 | union_unlock(ap) | |
1109 | struct vop_lock_args *ap; | |
1110 | { | |
1111 | struct union_node *un = VTOUNION(ap->a_vp); | |
1112 | ||
1113 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1114 | if ((un->un_flags & UN_LOCKED) == 0) |
1115 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1116 | if (curproc && un->un_pid != curproc->p_pid && |
1117 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1118 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1119 | #endif |
1120 | ||
a1fa407d JSP |
1121 | un->un_flags &= ~UN_LOCKED; |
1122 | if (un->un_flags & UN_WANT) { | |
1123 | un->un_flags &= ~UN_WANT; | |
1124 | wakeup((caddr_t) &un->un_flags); | |
1125 | } | |
1126 | ||
1127 | #ifdef DIAGNOSTIC | |
1128 | un->un_pid = 0; | |
1129 | #endif | |
1130 | } | |
1131 | ||
12abe7b1 JSP |
1132 | int |
1133 | union_bmap(ap) | |
1134 | struct vop_bmap_args /* { | |
1135 | struct vnode *a_vp; | |
1136 | daddr_t a_bn; | |
1137 | struct vnode **a_vpp; | |
1138 | daddr_t *a_bnp; | |
1139 | int *a_runp; | |
1140 | } */ *ap; | |
1141 | { | |
1142 | int error; | |
1143 | struct vnode *vp = OTHERVP(ap->a_vp); | |
1144 | ||
1145 | VOP_LOCK(vp); | |
1146 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); | |
1147 | VOP_UNLOCK(vp); | |
1148 | ||
1149 | return (error); | |
1150 | } | |
1151 | ||
1152 | int | |
1153 | union_print(ap) | |
1154 | struct vop_print_args /* { | |
1155 | struct vnode *a_vp; | |
1156 | } */ *ap; | |
1157 | { | |
1158 | struct vnode *vp = ap->a_vp; | |
1159 | ||
1160 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1161 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1162 | return (0); | |
1163 | } | |
1164 | ||
1165 | int | |
1166 | union_islocked(ap) | |
1167 | struct vop_islocked_args /* { | |
1168 | struct vnode *a_vp; | |
1169 | } */ *ap; | |
1170 | { | |
1171 | ||
1172 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1173 | } | |
1174 | ||
1175 | int | |
1176 | union_pathconf(ap) | |
1177 | struct vop_pathconf_args /* { | |
1178 | struct vnode *a_vp; | |
1179 | int a_name; | |
1180 | int *a_retval; | |
1181 | } */ *ap; | |
1182 | { | |
1183 | int error; | |
1184 | struct vnode *vp = OTHERVP(ap->a_vp); | |
1185 | ||
1186 | VOP_LOCK(vp); | |
1187 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); | |
1188 | VOP_UNLOCK(vp); | |
1189 | ||
1190 | return (error); | |
1191 | } | |
1192 | ||
1193 | int | |
1194 | union_advlock(ap) | |
1195 | struct vop_advlock_args /* { | |
1196 | struct vnode *a_vp; | |
1197 | caddr_t a_id; | |
1198 | int a_op; | |
1199 | struct flock *a_fl; | |
1200 | int a_flags; | |
1201 | } */ *ap; | |
1202 | { | |
1203 | ||
1204 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1205 | ap->a_fl, ap->a_flags)); | |
1206 | } | |
1207 | ||
1208 | ||
a1fa407d | 1209 | /* |
12abe7b1 JSP |
1210 | * XXX - vop_strategy must be hand coded because it has no |
1211 | * vnode in its arguments. | |
1212 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1213 | */ |
12abe7b1 JSP |
1214 | int |
1215 | union_strategy(ap) | |
1216 | struct vop_strategy_args /* { | |
1217 | struct buf *a_bp; | |
1218 | } */ *ap; | |
1219 | { | |
1220 | struct buf *bp = ap->a_bp; | |
1221 | int error; | |
1222 | struct vnode *savedvp; | |
1223 | ||
1224 | savedvp = bp->b_vp; | |
1225 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1226 | |
12abe7b1 | 1227 | #ifdef DIAGNOSTIC |
3b293975 | 1228 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1229 | panic("union_strategy: nil vp"); |
1230 | if (((bp->b_flags & B_READ) == 0) && | |
1231 | (bp->b_vp == LOWERVP(savedvp))) | |
1232 | panic("union_strategy: writing to lowervp"); | |
1233 | #endif | |
a1fa407d | 1234 | |
12abe7b1 JSP |
1235 | error = VOP_STRATEGY(bp); |
1236 | bp->b_vp = savedvp; | |
a1fa407d | 1237 | |
12abe7b1 JSP |
1238 | return (error); |
1239 | } | |
a1fa407d | 1240 | |
12abe7b1 JSP |
1241 | /* |
1242 | * Global vfs data structures | |
1243 | */ | |
1244 | int (**union_vnodeop_p)(); | |
01dac67e | 1245 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1246 | { &vop_default_desc, vn_default_error }, |
1247 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1248 | { &vop_create_desc, union_create }, /* create */ | |
1249 | { &vop_mknod_desc, union_mknod }, /* mknod */ | |
1250 | { &vop_open_desc, union_open }, /* open */ | |
1251 | { &vop_close_desc, union_close }, /* close */ | |
1252 | { &vop_access_desc, union_access }, /* access */ | |
1253 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1254 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1255 | { &vop_read_desc, union_read }, /* read */ | |
1256 | { &vop_write_desc, union_write }, /* write */ | |
1257 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ | |
1258 | { &vop_select_desc, union_select }, /* select */ | |
1259 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1260 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1261 | { &vop_seek_desc, union_seek }, /* seek */ | |
1262 | { &vop_remove_desc, union_remove }, /* remove */ | |
1263 | { &vop_link_desc, union_link }, /* link */ | |
1264 | { &vop_rename_desc, union_rename }, /* rename */ | |
1265 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1266 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1267 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1268 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1269 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1270 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1271 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1272 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1273 | { &vop_lock_desc, union_lock }, /* lock */ | |
1274 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1275 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1276 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1277 | { &vop_print_desc, union_print }, /* print */ | |
1278 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1279 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1280 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1281 | #ifdef notdef | |
1282 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1283 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1284 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1285 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1286 | { &vop_update_desc, union_update }, /* update */ | |
1287 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1288 | #endif | |
a1fa407d JSP |
1289 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1290 | }; | |
1291 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1292 | { &union_vnodeop_p, union_vnodeop_entries }; |