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 | * | |
692a90df | 11 | * @(#)union_vnops.c 1.9 (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 (;;) { | |
692a90df JSP |
46 | /* |
47 | * Don't do the NOCROSSMOUNT check | |
48 | * at this level. By definition, | |
49 | * union fs deals with namespaces, not | |
50 | * filesystems. | |
51 | */ | |
52 | if ((dvp->v_flag & VROOT) == 0) | |
a1fa407d JSP |
53 | break; |
54 | ||
55 | tdvp = dvp; | |
56 | dvp = dvp->v_mount->mnt_vnodecovered; | |
57 | vput(tdvp); | |
58 | VREF(dvp); | |
59 | VOP_LOCK(dvp); | |
60 | } | |
61 | } | |
ed5969c8 | 62 | |
a1fa407d JSP |
63 | error = VOP_LOOKUP(dvp, &tdvp, cnp); |
64 | if (error) | |
65 | return (error); | |
66 | ||
81be6ee0 | 67 | /* |
ed5969c8 JSP |
68 | * The parent directory will have been unlocked, unless lookup |
69 | * found the last component. In which case, re-lock the node | |
70 | * here to allow it to be unlocked again (phew) in union_lookup. | |
81be6ee0 | 71 | */ |
ed5969c8 | 72 | if (dvp != tdvp && !(cnp->cn_flags & ISLASTCN)) |
81be6ee0 JSP |
73 | VOP_LOCK(dvp); |
74 | ||
a1fa407d | 75 | dvp = tdvp; |
81be6ee0 JSP |
76 | |
77 | /* | |
78 | * Lastly check if the current node is a mount point in | |
692a90df | 79 | * which case walk up the mount hierarchy making sure not to |
81be6ee0 JSP |
80 | * bump into the root of the mount tree (ie. dvp != udvp). |
81 | */ | |
79f80c71 | 82 | while (dvp != udvp && (dvp->v_type == VDIR) && |
692a90df | 83 | (mp = dvp->v_mountedhere)) { |
a1fa407d JSP |
84 | |
85 | if (mp->mnt_flag & MNT_MLOCK) { | |
86 | mp->mnt_flag |= MNT_MWAIT; | |
87 | sleep((caddr_t) mp, PVFS); | |
88 | continue; | |
89 | } | |
90 | ||
91 | if (error = VFS_ROOT(mp, &tdvp)) { | |
92 | vput(dvp); | |
93 | return (error); | |
94 | } | |
95 | ||
01dac67e | 96 | vput(dvp); |
a1fa407d JSP |
97 | dvp = tdvp; |
98 | } | |
99 | ||
100 | *vpp = dvp; | |
101 | return (0); | |
102 | } | |
103 | ||
104 | int | |
105 | union_lookup(ap) | |
106 | struct vop_lookup_args /* { | |
107 | struct vnodeop_desc *a_desc; | |
108 | struct vnode *a_dvp; | |
109 | struct vnode **a_vpp; | |
110 | struct componentname *a_cnp; | |
111 | } */ *ap; | |
112 | { | |
01dac67e | 113 | int error; |
a1fa407d JSP |
114 | int uerror, lerror; |
115 | struct vnode *uppervp, *lowervp; | |
116 | struct vnode *upperdvp, *lowerdvp; | |
117 | struct vnode *dvp = ap->a_dvp; | |
79f80c71 | 118 | struct union_node *dun = VTOUNION(dvp); |
a1fa407d JSP |
119 | struct componentname *cnp = ap->a_cnp; |
120 | int lockparent = cnp->cn_flags & LOCKPARENT; | |
81be6ee0 | 121 | int rdonly = cnp->cn_flags & RDONLY; |
3b293975 | 122 | struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount); |
a1fa407d | 123 | |
01dac67e JSP |
124 | cnp->cn_flags |= LOCKPARENT; |
125 | ||
a1fa407d JSP |
126 | upperdvp = dun->un_uppervp; |
127 | lowerdvp = dun->un_lowervp; | |
3b293975 JSP |
128 | uppervp = NULLVP; |
129 | lowervp = NULLVP; | |
a1fa407d JSP |
130 | |
131 | /* | |
132 | * do the lookup in the upper level. | |
133 | * if that level comsumes additional pathnames, | |
134 | * then assume that something special is going | |
135 | * on and just return that vnode. | |
136 | */ | |
a1fa407d | 137 | if (upperdvp) { |
01dac67e | 138 | VOP_LOCK(upperdvp); |
3b293975 JSP |
139 | uerror = union_lookup1(um->um_uppervp, upperdvp, |
140 | &uppervp, cnp); | |
79f80c71 JSP |
141 | if (uppervp != upperdvp) |
142 | VOP_UNLOCK(upperdvp); | |
01dac67e | 143 | |
a1fa407d JSP |
144 | if (cnp->cn_consume != 0) { |
145 | *ap->a_vpp = uppervp; | |
01dac67e JSP |
146 | if (!lockparent) |
147 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
148 | return (uerror); |
149 | } | |
a1fa407d JSP |
150 | } else { |
151 | uerror = ENOENT; | |
152 | } | |
153 | ||
154 | /* | |
155 | * in a similar way to the upper layer, do the lookup | |
156 | * in the lower layer. this time, if there is some | |
157 | * component magic going on, then vput whatever we got | |
158 | * back from the upper layer and return the lower vnode | |
159 | * instead. | |
160 | */ | |
a1fa407d | 161 | if (lowerdvp) { |
01dac67e | 162 | VOP_LOCK(lowerdvp); |
3b293975 JSP |
163 | lerror = union_lookup1(um->um_lowervp, lowerdvp, |
164 | &lowervp, cnp); | |
79f80c71 JSP |
165 | if (lowervp != lowerdvp) |
166 | VOP_UNLOCK(lowerdvp); | |
01dac67e | 167 | |
a1fa407d JSP |
168 | if (cnp->cn_consume != 0) { |
169 | if (uppervp) { | |
170 | vput(uppervp); | |
3b293975 | 171 | uppervp = NULLVP; |
a1fa407d JSP |
172 | } |
173 | *ap->a_vpp = lowervp; | |
01dac67e JSP |
174 | if (!lockparent) |
175 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
176 | return (lerror); |
177 | } | |
a1fa407d JSP |
178 | } else { |
179 | lerror = ENOENT; | |
180 | } | |
181 | ||
01dac67e JSP |
182 | if (!lockparent) |
183 | cnp->cn_flags &= ~LOCKPARENT; | |
184 | ||
a1fa407d JSP |
185 | /* |
186 | * at this point, we have uerror and lerror indicating | |
187 | * possible errors with the lookups in the upper and lower | |
188 | * layers. additionally, uppervp and lowervp are (locked) | |
189 | * references to existing vnodes in the upper and lower layers. | |
190 | * | |
191 | * there are now three cases to consider. | |
192 | * 1. if both layers returned an error, then return whatever | |
193 | * error the upper layer generated. | |
194 | * | |
195 | * 2. if the top layer failed and the bottom layer succeeded | |
196 | * then two subcases occur. | |
197 | * a. the bottom vnode is not a directory, in which | |
198 | * case just return a new union vnode referencing | |
199 | * an empty top layer and the existing bottom layer. | |
200 | * b. the bottom vnode is a directory, in which case | |
201 | * create a new directory in the top-level and | |
202 | * continue as in case 3. | |
203 | * | |
204 | * 3. if the top layer succeeded then return a new union | |
205 | * vnode referencing whatever the new top layer and | |
206 | * whatever the bottom layer returned. | |
207 | */ | |
208 | ||
ed5969c8 JSP |
209 | *ap->a_vpp = NULLVP; |
210 | ||
a1fa407d JSP |
211 | /* case 1. */ |
212 | if ((uerror != 0) && (lerror != 0)) { | |
a1fa407d JSP |
213 | return (uerror); |
214 | } | |
215 | ||
216 | /* case 2. */ | |
217 | if (uerror != 0 /* && (lerror == 0) */ ) { | |
218 | if (lowervp->v_type == VDIR) { /* case 2b. */ | |
3b293975 | 219 | uerror = union_mkshadow(um, upperdvp, cnp, &uppervp); |
a1fa407d JSP |
220 | if (uerror) { |
221 | if (lowervp) { | |
222 | vput(lowervp); | |
3b293975 | 223 | lowervp = NULLVP; |
a1fa407d JSP |
224 | } |
225 | return (uerror); | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
01dac67e JSP |
230 | if (uppervp) |
231 | VOP_UNLOCK(uppervp); | |
232 | if (lowervp) | |
233 | VOP_UNLOCK(lowervp); | |
234 | ||
3b293975 JSP |
235 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
236 | uppervp, lowervp); | |
237 | ||
01dac67e JSP |
238 | if (error) { |
239 | if (uppervp) | |
240 | vrele(uppervp); | |
241 | if (lowervp) | |
242 | vrele(lowervp); | |
243 | } else { | |
81be6ee0 JSP |
244 | if (*ap->a_vpp != dvp) |
245 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
246 | VOP_UNLOCK(dvp); | |
01dac67e JSP |
247 | } |
248 | ||
249 | return (error); | |
a1fa407d JSP |
250 | } |
251 | ||
12abe7b1 JSP |
252 | int |
253 | union_create(ap) | |
254 | struct vop_create_args /* { | |
255 | struct vnode *a_dvp; | |
256 | struct vnode **a_vpp; | |
257 | struct componentname *a_cnp; | |
258 | struct vattr *a_vap; | |
259 | } */ *ap; | |
260 | { | |
261 | struct union_node *un = VTOUNION(ap->a_dvp); | |
262 | struct vnode *dvp = un->un_uppervp; | |
263 | ||
264 | if (dvp) { | |
265 | int error; | |
266 | struct vnode *vp; | |
12abe7b1 JSP |
267 | |
268 | VREF(dvp); | |
269 | VOP_LOCK(dvp); | |
270 | vput(ap->a_dvp); | |
271 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
272 | if (error) | |
273 | return (error); | |
274 | ||
3b293975 JSP |
275 | VOP_UNLOCK(vp); |
276 | ||
12abe7b1 JSP |
277 | error = union_allocvp( |
278 | ap->a_vpp, | |
79f80c71 JSP |
279 | ap->a_dvp->v_mount, |
280 | ap->a_dvp, | |
01dac67e | 281 | NULLVP, |
12abe7b1 JSP |
282 | ap->a_cnp, |
283 | vp, | |
284 | NULLVP); | |
01dac67e JSP |
285 | if (error) |
286 | vrele(vp); | |
12abe7b1 JSP |
287 | return (error); |
288 | } | |
289 | ||
290 | vput(ap->a_dvp); | |
291 | return (EROFS); | |
292 | } | |
293 | ||
294 | int | |
295 | union_mknod(ap) | |
296 | struct vop_mknod_args /* { | |
297 | struct vnode *a_dvp; | |
298 | struct vnode **a_vpp; | |
299 | struct componentname *a_cnp; | |
300 | struct vattr *a_vap; | |
301 | } */ *ap; | |
302 | { | |
303 | struct union_node *un = VTOUNION(ap->a_dvp); | |
304 | struct vnode *dvp = un->un_uppervp; | |
305 | ||
306 | if (dvp) { | |
307 | int error; | |
308 | struct vnode *vp; | |
12abe7b1 JSP |
309 | |
310 | VREF(dvp); | |
311 | VOP_LOCK(dvp); | |
312 | vput(ap->a_dvp); | |
313 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
314 | if (error) | |
315 | return (error); | |
316 | ||
01dac67e | 317 | if (vp) { |
3b293975 JSP |
318 | VOP_UNLOCK(vp); |
319 | ||
01dac67e JSP |
320 | error = union_allocvp( |
321 | ap->a_vpp, | |
79f80c71 JSP |
322 | ap->a_dvp->v_mount, |
323 | ap->a_dvp, | |
01dac67e JSP |
324 | NULLVP, |
325 | ap->a_cnp, | |
326 | vp, | |
327 | NULLVP); | |
01dac67e JSP |
328 | if (error) |
329 | vrele(vp); | |
330 | } | |
12abe7b1 JSP |
331 | return (error); |
332 | } | |
333 | ||
334 | vput(ap->a_dvp); | |
335 | return (EROFS); | |
336 | } | |
337 | ||
a1fa407d JSP |
338 | int |
339 | union_open(ap) | |
340 | struct vop_open_args /* { | |
341 | struct vnodeop_desc *a_desc; | |
342 | struct vnode *a_vp; | |
343 | int a_mode; | |
344 | struct ucred *a_cred; | |
345 | struct proc *a_p; | |
346 | } */ *ap; | |
347 | { | |
348 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 349 | struct vnode *tvp; |
a1fa407d JSP |
350 | int mode = ap->a_mode; |
351 | struct ucred *cred = ap->a_cred; | |
352 | struct proc *p = ap->a_p; | |
01dac67e | 353 | int error; |
a1fa407d JSP |
354 | |
355 | /* | |
356 | * If there is an existing upper vp then simply open that. | |
357 | */ | |
01dac67e JSP |
358 | tvp = un->un_uppervp; |
359 | if (tvp == NULLVP) { | |
a1fa407d | 360 | /* |
01dac67e JSP |
361 | * If the lower vnode is being opened for writing, then |
362 | * copy the file contents to the upper vnode and open that, | |
363 | * otherwise can simply open the lower vnode. | |
a1fa407d | 364 | */ |
01dac67e JSP |
365 | tvp = un->un_lowervp; |
366 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
81be6ee0 | 367 | struct vnode *vp; |
3b293975 | 368 | int i; |
01dac67e JSP |
369 | |
370 | /* | |
371 | * Open the named file in the upper layer. Note that | |
372 | * the file may have come into existence *since* the | |
373 | * lookup was done, since the upper layer may really | |
374 | * be a loopback mount of some other filesystem... | |
375 | * so open the file with exclusive create and barf if | |
376 | * it already exists. | |
ed5969c8 | 377 | * XXX - perhaps should re-lookup the node (once more |
01dac67e JSP |
378 | * with feeling) and simply open that. Who knows. |
379 | */ | |
3b293975 | 380 | error = union_vn_create(&vp, un, p); |
01dac67e JSP |
381 | if (error) |
382 | return (error); | |
81be6ee0 | 383 | un->un_uppervp = vp; /* XXX */ |
01dac67e JSP |
384 | /* at this point, uppervp is locked */ |
385 | ||
386 | /* | |
387 | * Now, if the file is being opened with truncation, | |
388 | * then the (new) upper vnode is ready to fly, | |
389 | * otherwise the data from the lower vnode must be | |
390 | * copied to the upper layer first. This only works | |
391 | * for regular files (check is made above). | |
392 | */ | |
393 | if ((mode & O_TRUNC) == 0) { | |
394 | /* | |
395 | * XXX - should not ignore errors | |
396 | * from VOP_CLOSE | |
397 | */ | |
81be6ee0 | 398 | VOP_LOCK(tvp); |
01dac67e JSP |
399 | error = VOP_OPEN(tvp, FREAD, cred, p); |
400 | if (error == 0) { | |
401 | error = union_copyfile(p, cred, | |
402 | tvp, un->un_uppervp); | |
403 | VOP_UNLOCK(tvp); | |
404 | (void) VOP_CLOSE(tvp, FREAD); | |
405 | } else { | |
406 | VOP_UNLOCK(tvp); | |
407 | } | |
408 | VOP_UNLOCK(un->un_uppervp); | |
15a86f7e | 409 | union_vn_close(un->un_uppervp, FWRITE, cred, p); |
01dac67e | 410 | VOP_LOCK(un->un_uppervp); |
3b293975 | 411 | if (!error) |
ed5969c8 | 412 | uprintf("union: copied up %s\n", |
3b293975 JSP |
413 | un->un_path); |
414 | } | |
415 | ||
416 | /* | |
417 | * Subsequent IOs will go to the top layer, so | |
418 | * call close on the lower vnode and open on the | |
419 | * upper vnode to ensure that the filesystem keeps | |
420 | * its references counts right. This doesn't do | |
421 | * the right thing with (cred) and (FREAD) though. | |
422 | * Ignoring error returns is not righ, either. | |
423 | */ | |
ed5969c8 | 424 | for (i = 0; i < un->un_openl; i++) { |
3b293975 JSP |
425 | (void) VOP_CLOSE(tvp, FREAD); |
426 | (void) VOP_OPEN(un->un_uppervp, FREAD, cred, p); | |
a1fa407d | 427 | } |
ed5969c8 | 428 | un->un_openl = 0; |
3b293975 | 429 | |
01dac67e JSP |
430 | if (error == 0) |
431 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
12abe7b1 | 432 | VOP_UNLOCK(un->un_uppervp); |
01dac67e | 433 | return (error); |
a1fa407d | 434 | } |
ed5969c8 | 435 | un->un_openl++; |
a1fa407d JSP |
436 | } |
437 | ||
01dac67e JSP |
438 | VOP_LOCK(tvp); |
439 | error = VOP_OPEN(tvp, mode, cred, p); | |
440 | VOP_UNLOCK(tvp); | |
441 | ||
442 | return (error); | |
a1fa407d JSP |
443 | } |
444 | ||
12abe7b1 JSP |
445 | int |
446 | union_close(ap) | |
447 | struct vop_close_args /* { | |
448 | struct vnode *a_vp; | |
449 | int a_fflag; | |
450 | struct ucred *a_cred; | |
451 | struct proc *a_p; | |
452 | } */ *ap; | |
453 | { | |
3b293975 JSP |
454 | struct union_node *un = VTOUNION(ap->a_vp); |
455 | struct vnode *vp; | |
12abe7b1 | 456 | |
3b293975 JSP |
457 | if (un->un_uppervp) { |
458 | vp = un->un_uppervp; | |
459 | } else { | |
ed5969c8 JSP |
460 | #ifdef UNION_DIAGNOSTIC |
461 | if (un->un_openl <= 0) | |
462 | panic("union: un_openl cnt"); | |
3b293975 | 463 | #endif |
ed5969c8 | 464 | --un->un_openl; |
3b293975 JSP |
465 | vp = un->un_lowervp; |
466 | } | |
ed5969c8 | 467 | |
3b293975 | 468 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
469 | } |
470 | ||
471 | /* | |
472 | * Check access permission on the union vnode. | |
473 | * The access check being enforced is to check | |
474 | * against both the underlying vnode, and any | |
475 | * copied vnode. This ensures that no additional | |
476 | * file permissions are given away simply because | |
477 | * the user caused an implicit file copy. | |
478 | */ | |
479 | int | |
480 | union_access(ap) | |
481 | struct vop_access_args /* { | |
482 | struct vnodeop_desc *a_desc; | |
483 | struct vnode *a_vp; | |
484 | int a_mode; | |
485 | struct ucred *a_cred; | |
486 | struct proc *a_p; | |
487 | } */ *ap; | |
488 | { | |
489 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 490 | int error = 0; |
12abe7b1 JSP |
491 | struct vnode *vp; |
492 | ||
493 | if (vp = un->un_lowervp) { | |
01dac67e | 494 | VOP_LOCK(vp); |
12abe7b1 | 495 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
01dac67e | 496 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
497 | if (error) |
498 | return (error); | |
499 | } | |
500 | ||
01dac67e JSP |
501 | if (vp = un->un_uppervp) { |
502 | VOP_LOCK(vp); | |
503 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); | |
504 | VOP_UNLOCK(vp); | |
505 | } | |
506 | ||
507 | return (error); | |
12abe7b1 JSP |
508 | } |
509 | ||
a1fa407d JSP |
510 | /* |
511 | * We handle getattr only to change the fsid. | |
512 | */ | |
513 | int | |
514 | union_getattr(ap) | |
515 | struct vop_getattr_args /* { | |
516 | struct vnode *a_vp; | |
517 | struct vattr *a_vap; | |
518 | struct ucred *a_cred; | |
519 | struct proc *a_p; | |
520 | } */ *ap; | |
521 | { | |
522 | int error; | |
01dac67e JSP |
523 | struct vnode *vp = OTHERVP(ap->a_vp); |
524 | ||
525 | VOP_LOCK(vp); | |
526 | error = VOP_GETATTR(vp, ap->a_vap, ap->a_cred, ap->a_p); | |
527 | VOP_UNLOCK(vp); | |
a1fa407d | 528 | |
a1fa407d JSP |
529 | /* Requires that arguments be restored. */ |
530 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; | |
531 | return (0); | |
532 | } | |
533 | ||
a1fa407d | 534 | int |
01dac67e | 535 | union_setattr(ap) |
12abe7b1 | 536 | struct vop_setattr_args /* { |
a1fa407d | 537 | struct vnode *a_vp; |
12abe7b1 | 538 | struct vattr *a_vap; |
a1fa407d | 539 | struct ucred *a_cred; |
12abe7b1 | 540 | struct proc *a_p; |
a1fa407d JSP |
541 | } */ *ap; |
542 | { | |
543 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 544 | int error; |
a1fa407d | 545 | |
12abe7b1 JSP |
546 | if (un->un_uppervp) { |
547 | VOP_LOCK(un->un_uppervp); | |
548 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, | |
549 | ap->a_cred, ap->a_p); | |
550 | VOP_UNLOCK(un->un_uppervp); | |
551 | } else { | |
552 | /* | |
553 | * XXX should do a copyfile (perhaps only if | |
554 | * the file permission change, which would not | |
555 | * track va_ctime correctly). | |
556 | */ | |
557 | error = EROFS; | |
558 | } | |
a1fa407d | 559 | |
12abe7b1 | 560 | return (error); |
a1fa407d JSP |
561 | } |
562 | ||
563 | int | |
12abe7b1 JSP |
564 | union_read(ap) |
565 | struct vop_read_args /* { | |
a1fa407d | 566 | struct vnode *a_vp; |
12abe7b1 JSP |
567 | struct uio *a_uio; |
568 | int a_ioflag; | |
569 | struct ucred *a_cred; | |
a1fa407d JSP |
570 | } */ *ap; |
571 | { | |
12abe7b1 JSP |
572 | int error; |
573 | struct vnode *vp = OTHERVP(ap->a_vp); | |
a1fa407d | 574 | |
01dac67e | 575 | VOP_LOCK(vp); |
12abe7b1 | 576 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
01dac67e | 577 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
578 | |
579 | return (error); | |
a1fa407d JSP |
580 | } |
581 | ||
582 | int | |
12abe7b1 JSP |
583 | union_write(ap) |
584 | struct vop_read_args /* { | |
a1fa407d | 585 | struct vnode *a_vp; |
12abe7b1 JSP |
586 | struct uio *a_uio; |
587 | int a_ioflag; | |
588 | struct ucred *a_cred; | |
a1fa407d JSP |
589 | } */ *ap; |
590 | { | |
12abe7b1 JSP |
591 | int error; |
592 | struct vnode *vp = OTHERVP(ap->a_vp); | |
a1fa407d | 593 | |
12abe7b1 JSP |
594 | VOP_LOCK(vp); |
595 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); | |
596 | VOP_UNLOCK(vp); | |
a1fa407d | 597 | |
12abe7b1 JSP |
598 | return (error); |
599 | } | |
a1fa407d JSP |
600 | |
601 | int | |
12abe7b1 JSP |
602 | union_ioctl(ap) |
603 | struct vop_ioctl_args /* { | |
a1fa407d | 604 | struct vnode *a_vp; |
12abe7b1 JSP |
605 | int a_command; |
606 | caddr_t a_data; | |
607 | int a_fflag; | |
608 | struct ucred *a_cred; | |
609 | struct proc *a_p; | |
a1fa407d JSP |
610 | } */ *ap; |
611 | { | |
a1fa407d | 612 | |
12abe7b1 JSP |
613 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
614 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
615 | } |
616 | ||
a1fa407d | 617 | int |
12abe7b1 JSP |
618 | union_select(ap) |
619 | struct vop_select_args /* { | |
620 | struct vnode *a_vp; | |
621 | int a_which; | |
622 | int a_fflags; | |
623 | struct ucred *a_cred; | |
624 | struct proc *a_p; | |
625 | } */ *ap; | |
626 | { | |
627 | ||
628 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
629 | ap->a_cred, ap->a_p)); | |
630 | } | |
631 | ||
632 | int | |
633 | union_mmap(ap) | |
634 | struct vop_mmap_args /* { | |
635 | struct vnode *a_vp; | |
636 | int a_fflags; | |
637 | struct ucred *a_cred; | |
638 | struct proc *a_p; | |
639 | } */ *ap; | |
640 | { | |
641 | ||
642 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
643 | ap->a_cred, ap->a_p)); | |
644 | } | |
645 | ||
646 | int | |
647 | union_fsync(ap) | |
648 | struct vop_fsync_args /* { | |
649 | struct vnode *a_vp; | |
650 | struct ucred *a_cred; | |
651 | int a_waitfor; | |
652 | struct proc *a_p; | |
653 | } */ *ap; | |
654 | { | |
655 | int error = 0; | |
656 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
657 | ||
658 | if (targetvp) { | |
659 | VOP_LOCK(targetvp); | |
660 | error = VOP_FSYNC(targetvp, ap->a_cred, | |
661 | ap->a_waitfor, ap->a_p); | |
662 | VOP_UNLOCK(targetvp); | |
663 | } | |
664 | ||
665 | return (error); | |
666 | } | |
667 | ||
668 | int | |
669 | union_seek(ap) | |
670 | struct vop_seek_args /* { | |
671 | struct vnode *a_vp; | |
672 | off_t a_oldoff; | |
673 | off_t a_newoff; | |
674 | struct ucred *a_cred; | |
675 | } */ *ap; | |
676 | { | |
677 | ||
678 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
679 | } | |
680 | ||
681 | int | |
682 | union_remove(ap) | |
683 | struct vop_remove_args /* { | |
684 | struct vnode *a_dvp; | |
685 | struct vnode *a_vp; | |
686 | struct componentname *a_cnp; | |
a1fa407d JSP |
687 | } */ *ap; |
688 | { | |
a1fa407d | 689 | int error; |
12abe7b1 JSP |
690 | struct union_node *dun = VTOUNION(ap->a_dvp); |
691 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 692 | |
12abe7b1 JSP |
693 | if (dun->un_uppervp && un->un_uppervp) { |
694 | struct vnode *dvp = dun->un_uppervp; | |
695 | struct vnode *vp = un->un_uppervp; | |
a1fa407d | 696 | |
12abe7b1 JSP |
697 | VREF(dvp); |
698 | VOP_LOCK(dvp); | |
699 | vput(ap->a_dvp); | |
700 | VREF(vp); | |
701 | VOP_LOCK(vp); | |
702 | vput(ap->a_vp); | |
a1fa407d | 703 | |
12abe7b1 | 704 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
705 | if (!error) |
706 | union_removed_upper(un); | |
707 | ||
708 | /* | |
709 | * XXX: should create a whiteout here | |
710 | */ | |
12abe7b1 JSP |
711 | } else { |
712 | /* | |
713 | * XXX: should create a whiteout here | |
714 | */ | |
715 | vput(ap->a_dvp); | |
716 | vput(ap->a_vp); | |
717 | error = EROFS; | |
718 | } | |
719 | ||
720 | return (error); | |
721 | } | |
722 | ||
723 | int | |
724 | union_link(ap) | |
725 | struct vop_link_args /* { | |
726 | struct vnode *a_vp; | |
727 | struct vnode *a_tdvp; | |
728 | struct componentname *a_cnp; | |
729 | } */ *ap; | |
730 | { | |
731 | int error; | |
732 | struct union_node *dun = VTOUNION(ap->a_vp); | |
733 | struct union_node *un = VTOUNION(ap->a_tdvp); | |
734 | ||
735 | if (dun->un_uppervp && un->un_uppervp) { | |
736 | struct vnode *dvp = dun->un_uppervp; | |
737 | struct vnode *vp = un->un_uppervp; | |
738 | ||
739 | VREF(dvp); | |
740 | VOP_LOCK(dvp); | |
741 | vput(ap->a_vp); | |
742 | VREF(vp); | |
743 | vrele(ap->a_tdvp); | |
744 | ||
745 | error = VOP_LINK(dvp, vp, ap->a_cnp); | |
746 | } else { | |
747 | /* | |
748 | * XXX: need to copy to upper layer | |
749 | * and do the link there. | |
750 | */ | |
751 | vput(ap->a_vp); | |
752 | vrele(ap->a_tdvp); | |
753 | error = EROFS; | |
754 | } | |
a1fa407d JSP |
755 | |
756 | return (error); | |
757 | } | |
758 | ||
12abe7b1 JSP |
759 | int |
760 | union_rename(ap) | |
761 | struct vop_rename_args /* { | |
762 | struct vnode *a_fdvp; | |
763 | struct vnode *a_fvp; | |
764 | struct componentname *a_fcnp; | |
765 | struct vnode *a_tdvp; | |
766 | struct vnode *a_tvp; | |
767 | struct componentname *a_tcnp; | |
768 | } */ *ap; | |
769 | { | |
770 | int error; | |
771 | ||
772 | struct vnode *fdvp = ap->a_fdvp; | |
773 | struct vnode *fvp = ap->a_fvp; | |
774 | struct vnode *tdvp = ap->a_tdvp; | |
775 | struct vnode *tvp = ap->a_tvp; | |
776 | ||
777 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
778 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 779 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
780 | error = EROFS; |
781 | goto bad; | |
782 | } | |
783 | ||
784 | fdvp = un->un_uppervp; | |
785 | VREF(fdvp); | |
786 | vrele(ap->a_fdvp); | |
787 | } | |
788 | ||
789 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
790 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 791 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
792 | error = EROFS; |
793 | goto bad; | |
794 | } | |
795 | ||
796 | fvp = un->un_uppervp; | |
797 | VREF(fvp); | |
798 | vrele(ap->a_fvp); | |
799 | } | |
800 | ||
801 | if (tdvp->v_op == union_vnodeop_p) { | |
802 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 803 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
804 | error = EROFS; |
805 | goto bad; | |
806 | } | |
807 | ||
808 | tdvp = un->un_uppervp; | |
809 | VREF(tdvp); | |
810 | VOP_LOCK(tdvp); | |
3b293975 | 811 | vput(ap->a_tdvp); |
12abe7b1 JSP |
812 | } |
813 | ||
814 | if (tvp && tvp->v_op == union_vnodeop_p) { | |
815 | struct union_node *un = VTOUNION(tvp); | |
3b293975 | 816 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
817 | error = EROFS; |
818 | goto bad; | |
819 | } | |
820 | ||
821 | tvp = un->un_uppervp; | |
822 | VREF(tvp); | |
823 | VOP_LOCK(tvp); | |
824 | vput(ap->a_tvp); | |
825 | } | |
826 | ||
827 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
828 | ||
829 | bad: | |
830 | vrele(fdvp); | |
831 | vrele(fvp); | |
832 | vput(tdvp); | |
833 | if (tvp) | |
834 | vput(tvp); | |
835 | ||
836 | return (error); | |
837 | } | |
838 | ||
839 | int | |
840 | union_mkdir(ap) | |
841 | struct vop_mkdir_args /* { | |
842 | struct vnode *a_dvp; | |
843 | struct vnode **a_vpp; | |
844 | struct componentname *a_cnp; | |
845 | struct vattr *a_vap; | |
846 | } */ *ap; | |
847 | { | |
848 | struct union_node *un = VTOUNION(ap->a_dvp); | |
849 | struct vnode *dvp = un->un_uppervp; | |
850 | ||
851 | if (dvp) { | |
852 | int error; | |
853 | struct vnode *vp; | |
12abe7b1 JSP |
854 | |
855 | VREF(dvp); | |
856 | VOP_LOCK(dvp); | |
857 | vput(ap->a_dvp); | |
858 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); | |
859 | if (error) | |
860 | return (error); | |
861 | ||
3b293975 | 862 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
863 | error = union_allocvp( |
864 | ap->a_vpp, | |
79f80c71 JSP |
865 | ap->a_dvp->v_mount, |
866 | ap->a_dvp, | |
01dac67e | 867 | NULLVP, |
12abe7b1 JSP |
868 | ap->a_cnp, |
869 | vp, | |
870 | NULLVP); | |
01dac67e JSP |
871 | if (error) |
872 | vrele(vp); | |
12abe7b1 JSP |
873 | return (error); |
874 | } | |
875 | ||
876 | vput(ap->a_dvp); | |
877 | return (EROFS); | |
878 | } | |
879 | ||
880 | int | |
881 | union_rmdir(ap) | |
882 | struct vop_rmdir_args /* { | |
883 | struct vnode *a_dvp; | |
884 | struct vnode *a_vp; | |
885 | struct componentname *a_cnp; | |
886 | } */ *ap; | |
887 | { | |
888 | int error; | |
889 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
890 | struct union_node *un = VTOUNION(ap->a_vp); | |
891 | ||
892 | if (dun->un_uppervp && un->un_uppervp) { | |
893 | struct vnode *dvp = dun->un_uppervp; | |
894 | struct vnode *vp = un->un_uppervp; | |
895 | ||
896 | VREF(dvp); | |
897 | VOP_LOCK(dvp); | |
898 | vput(ap->a_dvp); | |
899 | VREF(vp); | |
900 | VOP_LOCK(vp); | |
901 | vput(ap->a_vp); | |
902 | ||
903 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); | |
ed5969c8 JSP |
904 | if (!error) |
905 | union_removed_upper(un); | |
906 | ||
907 | /* | |
908 | * XXX: should create a whiteout here | |
909 | */ | |
12abe7b1 JSP |
910 | } else { |
911 | /* | |
912 | * XXX: should create a whiteout here | |
913 | */ | |
914 | vput(ap->a_dvp); | |
915 | vput(ap->a_vp); | |
916 | error = EROFS; | |
917 | } | |
918 | ||
919 | return (error); | |
920 | } | |
921 | ||
922 | int | |
923 | union_symlink(ap) | |
924 | struct vop_symlink_args /* { | |
925 | struct vnode *a_dvp; | |
926 | struct vnode **a_vpp; | |
927 | struct componentname *a_cnp; | |
928 | struct vattr *a_vap; | |
929 | char *a_target; | |
930 | } */ *ap; | |
931 | { | |
932 | struct union_node *un = VTOUNION(ap->a_dvp); | |
933 | struct vnode *dvp = un->un_uppervp; | |
934 | ||
935 | if (dvp) { | |
936 | int error; | |
937 | struct vnode *vp; | |
938 | struct mount *mp = ap->a_dvp->v_mount; | |
939 | ||
940 | VREF(dvp); | |
941 | VOP_LOCK(dvp); | |
942 | vput(ap->a_dvp); | |
943 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
944 | ap->a_vap, ap->a_target); | |
3b293975 | 945 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
946 | return (error); |
947 | } | |
948 | ||
949 | vput(ap->a_dvp); | |
950 | return (EROFS); | |
951 | } | |
a1fa407d JSP |
952 | |
953 | /* | |
12abe7b1 JSP |
954 | * union_readdir works in concert with getdirentries and |
955 | * readdir(3) to provide a list of entries in the unioned | |
956 | * directories. getdirentries is responsible for walking | |
957 | * down the union stack. readdir(3) is responsible for | |
958 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
959 | */ |
960 | int | |
12abe7b1 JSP |
961 | union_readdir(ap) |
962 | struct vop_readdir_args /* { | |
963 | struct vnodeop_desc *a_desc; | |
964 | struct vnode *a_vp; | |
965 | struct uio *a_uio; | |
966 | struct ucred *a_cred; | |
967 | } */ *ap; | |
968 | { | |
969 | int error = 0; | |
970 | struct union_node *un = VTOUNION(ap->a_vp); | |
971 | ||
972 | if (un->un_uppervp) { | |
15a86f7e | 973 | struct vnode *vp = un->un_uppervp; |
12abe7b1 JSP |
974 | |
975 | VOP_LOCK(vp); | |
976 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); | |
977 | VOP_UNLOCK(vp); | |
978 | } | |
979 | ||
980 | return (error); | |
981 | } | |
982 | ||
983 | int | |
984 | union_readlink(ap) | |
985 | struct vop_readlink_args /* { | |
986 | struct vnode *a_vp; | |
987 | struct uio *a_uio; | |
988 | struct ucred *a_cred; | |
a1fa407d JSP |
989 | } */ *ap; |
990 | { | |
a1fa407d | 991 | int error; |
12abe7b1 | 992 | struct vnode *vp = OTHERVP(ap->a_vp); |
a1fa407d | 993 | |
12abe7b1 JSP |
994 | VOP_LOCK(vp); |
995 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); | |
996 | VOP_UNLOCK(vp); | |
a1fa407d | 997 | |
12abe7b1 JSP |
998 | return (error); |
999 | } | |
a1fa407d | 1000 | |
12abe7b1 JSP |
1001 | int |
1002 | union_abortop(ap) | |
1003 | struct vop_abortop_args /* { | |
1004 | struct vnode *a_dvp; | |
1005 | struct componentname *a_cnp; | |
1006 | } */ *ap; | |
1007 | { | |
1008 | int error; | |
01dac67e | 1009 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1010 | struct union_node *un = VTOUNION(ap->a_dvp); |
1011 | int islocked = un->un_flags & UN_LOCKED; | |
a1fa407d | 1012 | |
12abe7b1 JSP |
1013 | if (islocked) |
1014 | VOP_LOCK(vp); | |
1015 | error = VOP_ABORTOP(vp, ap->a_cnp); | |
1016 | if (islocked) | |
1017 | VOP_UNLOCK(vp); | |
a1fa407d JSP |
1018 | |
1019 | return (error); | |
1020 | } | |
1021 | ||
12abe7b1 JSP |
1022 | int |
1023 | union_inactive(ap) | |
1024 | struct vop_inactive_args /* { | |
1025 | struct vnode *a_vp; | |
1026 | } */ *ap; | |
1027 | { | |
1028 | ||
1029 | /* | |
1030 | * Do nothing (and _don't_ bypass). | |
1031 | * Wait to vrele lowervp until reclaim, | |
1032 | * so that until then our union_node is in the | |
1033 | * cache and reusable. | |
1034 | * | |
1035 | * NEEDSWORK: Someday, consider inactive'ing | |
1036 | * the lowervp and then trying to reactivate it | |
1037 | * with capabilities (v_id) | |
1038 | * like they do in the name lookup cache code. | |
1039 | * That's too much work for now. | |
1040 | */ | |
79f80c71 | 1041 | |
ed5969c8 | 1042 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1043 | struct union_node *un = VTOUNION(ap->a_vp); |
1044 | ||
1045 | if (un->un_flags & UN_LOCKED) | |
1046 | panic("union: inactivating locked node"); | |
1047 | #endif | |
1048 | ||
12abe7b1 JSP |
1049 | return (0); |
1050 | } | |
1051 | ||
1052 | int | |
1053 | union_reclaim(ap) | |
1054 | struct vop_reclaim_args /* { | |
1055 | struct vnode *a_vp; | |
1056 | } */ *ap; | |
1057 | { | |
1058 | struct vnode *vp = ap->a_vp; | |
1059 | struct union_node *un = VTOUNION(vp); | |
1060 | struct vnode *uppervp = un->un_uppervp; | |
1061 | struct vnode *lowervp = un->un_lowervp; | |
1062 | struct vnode *dirvp = un->un_dirvp; | |
1063 | char *path = un->un_path; | |
1064 | ||
1065 | /* | |
1066 | * Note: in vop_reclaim, vp->v_op == dead_vnodeop_p, | |
1067 | * so we can't call VOPs on ourself. | |
1068 | */ | |
1069 | /* After this assignment, this node will not be re-used. */ | |
3b293975 JSP |
1070 | un->un_uppervp = NULLVP; |
1071 | un->un_lowervp = NULLVP; | |
1072 | un->un_dirvp = NULLVP; | |
12abe7b1 JSP |
1073 | un->un_path = NULL; |
1074 | union_freevp(vp); | |
1075 | if (uppervp) | |
1076 | vrele(uppervp); | |
1077 | if (lowervp) | |
1078 | vrele(lowervp); | |
1079 | if (dirvp) | |
1080 | vrele(dirvp); | |
1081 | if (path) | |
1082 | free(path, M_TEMP); | |
1083 | return (0); | |
1084 | } | |
1085 | ||
a1fa407d JSP |
1086 | int |
1087 | union_lock(ap) | |
1088 | struct vop_lock_args *ap; | |
1089 | { | |
1090 | struct union_node *un = VTOUNION(ap->a_vp); | |
1091 | ||
01dac67e | 1092 | while (un->un_flags & UN_LOCKED) { |
a1fa407d | 1093 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1094 | if (curproc && un->un_pid == curproc->p_pid && |
1095 | un->un_pid > -1 && curproc->p_pid > -1) | |
1096 | panic("union: locking against myself"); | |
a1fa407d | 1097 | #endif |
a1fa407d JSP |
1098 | un->un_flags |= UN_WANT; |
1099 | sleep((caddr_t) &un->un_flags, PINOD); | |
1100 | } | |
1101 | un->un_flags |= UN_LOCKED; | |
79f80c71 | 1102 | |
a1fa407d | 1103 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1104 | if (curproc) |
1105 | un->un_pid = curproc->p_pid; | |
1106 | else | |
1107 | un->un_pid = -1; | |
a1fa407d | 1108 | #endif |
15a86f7e JSP |
1109 | |
1110 | return (0); | |
a1fa407d JSP |
1111 | } |
1112 | ||
1113 | int | |
1114 | union_unlock(ap) | |
1115 | struct vop_lock_args *ap; | |
1116 | { | |
1117 | struct union_node *un = VTOUNION(ap->a_vp); | |
1118 | ||
1119 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1120 | if ((un->un_flags & UN_LOCKED) == 0) |
1121 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1122 | if (curproc && un->un_pid != curproc->p_pid && |
1123 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1124 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1125 | #endif |
1126 | ||
a1fa407d JSP |
1127 | un->un_flags &= ~UN_LOCKED; |
1128 | if (un->un_flags & UN_WANT) { | |
1129 | un->un_flags &= ~UN_WANT; | |
1130 | wakeup((caddr_t) &un->un_flags); | |
1131 | } | |
1132 | ||
1133 | #ifdef DIAGNOSTIC | |
1134 | un->un_pid = 0; | |
1135 | #endif | |
15a86f7e JSP |
1136 | |
1137 | return (0); | |
a1fa407d JSP |
1138 | } |
1139 | ||
12abe7b1 JSP |
1140 | int |
1141 | union_bmap(ap) | |
1142 | struct vop_bmap_args /* { | |
1143 | struct vnode *a_vp; | |
1144 | daddr_t a_bn; | |
1145 | struct vnode **a_vpp; | |
1146 | daddr_t *a_bnp; | |
1147 | int *a_runp; | |
1148 | } */ *ap; | |
1149 | { | |
1150 | int error; | |
1151 | struct vnode *vp = OTHERVP(ap->a_vp); | |
1152 | ||
1153 | VOP_LOCK(vp); | |
1154 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); | |
1155 | VOP_UNLOCK(vp); | |
1156 | ||
1157 | return (error); | |
1158 | } | |
1159 | ||
1160 | int | |
1161 | union_print(ap) | |
1162 | struct vop_print_args /* { | |
1163 | struct vnode *a_vp; | |
1164 | } */ *ap; | |
1165 | { | |
1166 | struct vnode *vp = ap->a_vp; | |
1167 | ||
1168 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1169 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1170 | return (0); | |
1171 | } | |
1172 | ||
1173 | int | |
1174 | union_islocked(ap) | |
1175 | struct vop_islocked_args /* { | |
1176 | struct vnode *a_vp; | |
1177 | } */ *ap; | |
1178 | { | |
1179 | ||
1180 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1181 | } | |
1182 | ||
1183 | int | |
1184 | union_pathconf(ap) | |
1185 | struct vop_pathconf_args /* { | |
1186 | struct vnode *a_vp; | |
1187 | int a_name; | |
1188 | int *a_retval; | |
1189 | } */ *ap; | |
1190 | { | |
1191 | int error; | |
1192 | struct vnode *vp = OTHERVP(ap->a_vp); | |
1193 | ||
1194 | VOP_LOCK(vp); | |
1195 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); | |
1196 | VOP_UNLOCK(vp); | |
1197 | ||
1198 | return (error); | |
1199 | } | |
1200 | ||
1201 | int | |
1202 | union_advlock(ap) | |
1203 | struct vop_advlock_args /* { | |
1204 | struct vnode *a_vp; | |
1205 | caddr_t a_id; | |
1206 | int a_op; | |
1207 | struct flock *a_fl; | |
1208 | int a_flags; | |
1209 | } */ *ap; | |
1210 | { | |
1211 | ||
1212 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1213 | ap->a_fl, ap->a_flags)); | |
1214 | } | |
1215 | ||
1216 | ||
a1fa407d | 1217 | /* |
12abe7b1 JSP |
1218 | * XXX - vop_strategy must be hand coded because it has no |
1219 | * vnode in its arguments. | |
1220 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1221 | */ |
12abe7b1 JSP |
1222 | int |
1223 | union_strategy(ap) | |
1224 | struct vop_strategy_args /* { | |
1225 | struct buf *a_bp; | |
1226 | } */ *ap; | |
1227 | { | |
1228 | struct buf *bp = ap->a_bp; | |
1229 | int error; | |
1230 | struct vnode *savedvp; | |
1231 | ||
1232 | savedvp = bp->b_vp; | |
1233 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1234 | |
12abe7b1 | 1235 | #ifdef DIAGNOSTIC |
3b293975 | 1236 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1237 | panic("union_strategy: nil vp"); |
1238 | if (((bp->b_flags & B_READ) == 0) && | |
1239 | (bp->b_vp == LOWERVP(savedvp))) | |
1240 | panic("union_strategy: writing to lowervp"); | |
1241 | #endif | |
a1fa407d | 1242 | |
12abe7b1 JSP |
1243 | error = VOP_STRATEGY(bp); |
1244 | bp->b_vp = savedvp; | |
a1fa407d | 1245 | |
12abe7b1 JSP |
1246 | return (error); |
1247 | } | |
a1fa407d | 1248 | |
12abe7b1 JSP |
1249 | /* |
1250 | * Global vfs data structures | |
1251 | */ | |
1252 | int (**union_vnodeop_p)(); | |
01dac67e | 1253 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1254 | { &vop_default_desc, vn_default_error }, |
1255 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1256 | { &vop_create_desc, union_create }, /* create */ | |
1257 | { &vop_mknod_desc, union_mknod }, /* mknod */ | |
1258 | { &vop_open_desc, union_open }, /* open */ | |
1259 | { &vop_close_desc, union_close }, /* close */ | |
1260 | { &vop_access_desc, union_access }, /* access */ | |
1261 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1262 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1263 | { &vop_read_desc, union_read }, /* read */ | |
1264 | { &vop_write_desc, union_write }, /* write */ | |
1265 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ | |
1266 | { &vop_select_desc, union_select }, /* select */ | |
1267 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1268 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1269 | { &vop_seek_desc, union_seek }, /* seek */ | |
1270 | { &vop_remove_desc, union_remove }, /* remove */ | |
1271 | { &vop_link_desc, union_link }, /* link */ | |
1272 | { &vop_rename_desc, union_rename }, /* rename */ | |
1273 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1274 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1275 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1276 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1277 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1278 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1279 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1280 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1281 | { &vop_lock_desc, union_lock }, /* lock */ | |
1282 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1283 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1284 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1285 | { &vop_print_desc, union_print }, /* print */ | |
1286 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1287 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1288 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1289 | #ifdef notdef | |
1290 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1291 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1292 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1293 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1294 | { &vop_update_desc, union_update }, /* update */ | |
1295 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1296 | #endif | |
a1fa407d JSP |
1297 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1298 | }; | |
1299 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1300 | { &union_vnodeop_p, union_vnodeop_entries }; |