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 | * | |
9192c54f | 11 | * @(#)union_vnops.c 8.17 (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> | |
58572fc0 | 25 | #include <sys/queue.h> |
2e1ae99e | 26 | #include <miscfs/union/union.h> |
a1fa407d | 27 | |
c1b204a8 JSP |
28 | #define FIXUP(un) { \ |
29 | if (((un)->un_flags & UN_ULOCK) == 0) { \ | |
30 | union_fixup(un); \ | |
31 | } \ | |
32 | } | |
33 | ||
34 | static void | |
35 | union_fixup(un) | |
36 | struct union_node *un; | |
37 | { | |
38 | ||
39 | VOP_LOCK(un->un_uppervp); | |
40 | un->un_flags |= UN_ULOCK; | |
41 | } | |
42 | ||
a1fa407d | 43 | static int |
df24bc61 | 44 | union_lookup1(udvp, dvpp, vpp, cnp) |
79f80c71 | 45 | struct vnode *udvp; |
df24bc61 | 46 | struct vnode **dvpp; |
a1fa407d JSP |
47 | struct vnode **vpp; |
48 | struct componentname *cnp; | |
49 | { | |
50 | int error; | |
51 | struct vnode *tdvp; | |
df24bc61 | 52 | struct vnode *dvp; |
a1fa407d JSP |
53 | struct mount *mp; |
54 | ||
df24bc61 JSP |
55 | dvp = *dvpp; |
56 | ||
81be6ee0 JSP |
57 | /* |
58 | * If stepping up the directory tree, check for going | |
59 | * back across the mount point, in which case do what | |
60 | * lookup would do by stepping back down the mount | |
61 | * hierarchy. | |
62 | */ | |
a1fa407d | 63 | if (cnp->cn_flags & ISDOTDOT) { |
df24bc61 | 64 | while ((dvp != udvp) && (dvp->v_flag & VROOT)) { |
692a90df JSP |
65 | /* |
66 | * Don't do the NOCROSSMOUNT check | |
67 | * at this level. By definition, | |
68 | * union fs deals with namespaces, not | |
69 | * filesystems. | |
70 | */ | |
a1fa407d | 71 | tdvp = dvp; |
df24bc61 | 72 | *dvpp = dvp = dvp->v_mount->mnt_vnodecovered; |
a1fa407d JSP |
73 | vput(tdvp); |
74 | VREF(dvp); | |
75 | VOP_LOCK(dvp); | |
76 | } | |
77 | } | |
ed5969c8 | 78 | |
a1fa407d JSP |
79 | error = VOP_LOOKUP(dvp, &tdvp, cnp); |
80 | if (error) | |
81 | return (error); | |
82 | ||
81be6ee0 | 83 | /* |
ed5969c8 JSP |
84 | * The parent directory will have been unlocked, unless lookup |
85 | * found the last component. In which case, re-lock the node | |
86 | * here to allow it to be unlocked again (phew) in union_lookup. | |
81be6ee0 | 87 | */ |
ed5969c8 | 88 | if (dvp != tdvp && !(cnp->cn_flags & ISLASTCN)) |
81be6ee0 JSP |
89 | VOP_LOCK(dvp); |
90 | ||
a1fa407d | 91 | dvp = tdvp; |
81be6ee0 JSP |
92 | |
93 | /* | |
94 | * Lastly check if the current node is a mount point in | |
692a90df | 95 | * which case walk up the mount hierarchy making sure not to |
81be6ee0 JSP |
96 | * bump into the root of the mount tree (ie. dvp != udvp). |
97 | */ | |
79f80c71 | 98 | while (dvp != udvp && (dvp->v_type == VDIR) && |
692a90df | 99 | (mp = dvp->v_mountedhere)) { |
a1fa407d JSP |
100 | |
101 | if (mp->mnt_flag & MNT_MLOCK) { | |
102 | mp->mnt_flag |= MNT_MWAIT; | |
103 | sleep((caddr_t) mp, PVFS); | |
104 | continue; | |
105 | } | |
106 | ||
107 | if (error = VFS_ROOT(mp, &tdvp)) { | |
108 | vput(dvp); | |
109 | return (error); | |
110 | } | |
111 | ||
01dac67e | 112 | vput(dvp); |
a1fa407d JSP |
113 | dvp = tdvp; |
114 | } | |
115 | ||
116 | *vpp = dvp; | |
117 | return (0); | |
118 | } | |
119 | ||
120 | int | |
121 | union_lookup(ap) | |
122 | struct vop_lookup_args /* { | |
123 | struct vnodeop_desc *a_desc; | |
124 | struct vnode *a_dvp; | |
125 | struct vnode **a_vpp; | |
126 | struct componentname *a_cnp; | |
127 | } */ *ap; | |
128 | { | |
01dac67e | 129 | int error; |
a1fa407d JSP |
130 | int uerror, lerror; |
131 | struct vnode *uppervp, *lowervp; | |
132 | struct vnode *upperdvp, *lowerdvp; | |
133 | struct vnode *dvp = ap->a_dvp; | |
79f80c71 | 134 | struct union_node *dun = VTOUNION(dvp); |
a1fa407d JSP |
135 | struct componentname *cnp = ap->a_cnp; |
136 | int lockparent = cnp->cn_flags & LOCKPARENT; | |
81be6ee0 | 137 | int rdonly = cnp->cn_flags & RDONLY; |
3b293975 | 138 | struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount); |
c1b204a8 | 139 | struct ucred *saved_cred; |
a1fa407d | 140 | |
01dac67e JSP |
141 | cnp->cn_flags |= LOCKPARENT; |
142 | ||
a1fa407d JSP |
143 | upperdvp = dun->un_uppervp; |
144 | lowerdvp = dun->un_lowervp; | |
3b293975 JSP |
145 | uppervp = NULLVP; |
146 | lowervp = NULLVP; | |
a1fa407d JSP |
147 | |
148 | /* | |
149 | * do the lookup in the upper level. | |
150 | * if that level comsumes additional pathnames, | |
151 | * then assume that something special is going | |
152 | * on and just return that vnode. | |
153 | */ | |
050766c6 | 154 | if (upperdvp != NULLVP) { |
c1b204a8 | 155 | FIXUP(dun); |
df24bc61 | 156 | uerror = union_lookup1(um->um_uppervp, &upperdvp, |
3b293975 | 157 | &uppervp, cnp); |
e2a2f3a7 JSP |
158 | /*if (uppervp == upperdvp) |
159 | dun->un_flags |= UN_KLOCK;*/ | |
01dac67e | 160 | |
a1fa407d JSP |
161 | if (cnp->cn_consume != 0) { |
162 | *ap->a_vpp = uppervp; | |
01dac67e JSP |
163 | if (!lockparent) |
164 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
165 | return (uerror); |
166 | } | |
a1fa407d JSP |
167 | } else { |
168 | uerror = ENOENT; | |
169 | } | |
170 | ||
171 | /* | |
172 | * in a similar way to the upper layer, do the lookup | |
173 | * in the lower layer. this time, if there is some | |
174 | * component magic going on, then vput whatever we got | |
175 | * back from the upper layer and return the lower vnode | |
176 | * instead. | |
177 | */ | |
050766c6 | 178 | if (lowerdvp != NULLVP) { |
e2a2f3a7 JSP |
179 | int nameiop; |
180 | ||
01dac67e | 181 | VOP_LOCK(lowerdvp); |
e2a2f3a7 JSP |
182 | |
183 | /* | |
184 | * Only do a LOOKUP on the bottom node, since | |
185 | * we won't be making changes to it anyway. | |
186 | */ | |
187 | nameiop = cnp->cn_nameiop; | |
188 | cnp->cn_nameiop = LOOKUP; | |
c1b204a8 JSP |
189 | if (um->um_op == UNMNT_BELOW) { |
190 | saved_cred = cnp->cn_cred; | |
191 | cnp->cn_cred = um->um_cred; | |
192 | } | |
df24bc61 | 193 | lerror = union_lookup1(um->um_lowervp, &lowerdvp, |
e2a2f3a7 | 194 | &lowervp, cnp); |
c1b204a8 JSP |
195 | if (um->um_op == UNMNT_BELOW) |
196 | cnp->cn_cred = saved_cred; | |
e2a2f3a7 JSP |
197 | cnp->cn_nameiop = nameiop; |
198 | ||
79f80c71 JSP |
199 | if (lowervp != lowerdvp) |
200 | VOP_UNLOCK(lowerdvp); | |
01dac67e | 201 | |
a1fa407d | 202 | if (cnp->cn_consume != 0) { |
050766c6 | 203 | if (uppervp != NULLVP) { |
e2a2f3a7 JSP |
204 | if (uppervp == upperdvp) |
205 | vrele(uppervp); | |
206 | else | |
207 | vput(uppervp); | |
3b293975 | 208 | uppervp = NULLVP; |
a1fa407d JSP |
209 | } |
210 | *ap->a_vpp = lowervp; | |
01dac67e JSP |
211 | if (!lockparent) |
212 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
213 | return (lerror); |
214 | } | |
a1fa407d JSP |
215 | } else { |
216 | lerror = ENOENT; | |
9192c54f JSP |
217 | if ((cnp->cn_flags & ISDOTDOT) && dun->un_pvp != NULLVP) { |
218 | lowervp = LOWERVP(dun->un_pvp); | |
219 | if (lowervp != NULLVP) { | |
220 | VREF(lowervp); | |
221 | VOP_LOCK(lowervp); | |
222 | lerror = 0; | |
223 | } | |
224 | } | |
a1fa407d JSP |
225 | } |
226 | ||
01dac67e JSP |
227 | if (!lockparent) |
228 | cnp->cn_flags &= ~LOCKPARENT; | |
229 | ||
a1fa407d JSP |
230 | /* |
231 | * at this point, we have uerror and lerror indicating | |
232 | * possible errors with the lookups in the upper and lower | |
233 | * layers. additionally, uppervp and lowervp are (locked) | |
234 | * references to existing vnodes in the upper and lower layers. | |
235 | * | |
236 | * there are now three cases to consider. | |
237 | * 1. if both layers returned an error, then return whatever | |
238 | * error the upper layer generated. | |
239 | * | |
240 | * 2. if the top layer failed and the bottom layer succeeded | |
241 | * then two subcases occur. | |
242 | * a. the bottom vnode is not a directory, in which | |
243 | * case just return a new union vnode referencing | |
244 | * an empty top layer and the existing bottom layer. | |
245 | * b. the bottom vnode is a directory, in which case | |
246 | * create a new directory in the top-level and | |
247 | * continue as in case 3. | |
248 | * | |
249 | * 3. if the top layer succeeded then return a new union | |
250 | * vnode referencing whatever the new top layer and | |
251 | * whatever the bottom layer returned. | |
252 | */ | |
253 | ||
ed5969c8 JSP |
254 | *ap->a_vpp = NULLVP; |
255 | ||
a1fa407d JSP |
256 | /* case 1. */ |
257 | if ((uerror != 0) && (lerror != 0)) { | |
a1fa407d JSP |
258 | return (uerror); |
259 | } | |
260 | ||
261 | /* case 2. */ | |
262 | if (uerror != 0 /* && (lerror == 0) */ ) { | |
263 | if (lowervp->v_type == VDIR) { /* case 2b. */ | |
e2a2f3a7 JSP |
264 | dun->un_flags &= ~UN_ULOCK; |
265 | VOP_UNLOCK(upperdvp); | |
3b293975 | 266 | uerror = union_mkshadow(um, upperdvp, cnp, &uppervp); |
e2a2f3a7 JSP |
267 | VOP_LOCK(upperdvp); |
268 | dun->un_flags |= UN_ULOCK; | |
269 | ||
a1fa407d | 270 | if (uerror) { |
050766c6 | 271 | if (lowervp != NULLVP) { |
a1fa407d | 272 | vput(lowervp); |
3b293975 | 273 | lowervp = NULLVP; |
a1fa407d JSP |
274 | } |
275 | return (uerror); | |
276 | } | |
277 | } | |
278 | } | |
279 | ||
050766c6 | 280 | if (lowervp != NULLVP) |
01dac67e JSP |
281 | VOP_UNLOCK(lowervp); |
282 | ||
3b293975 JSP |
283 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
284 | uppervp, lowervp); | |
285 | ||
01dac67e | 286 | if (error) { |
050766c6 | 287 | if (uppervp != NULLVP) |
e2a2f3a7 | 288 | vput(uppervp); |
050766c6 | 289 | if (lowervp != NULLVP) |
01dac67e JSP |
290 | vrele(lowervp); |
291 | } else { | |
81be6ee0 JSP |
292 | if (*ap->a_vpp != dvp) |
293 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
294 | VOP_UNLOCK(dvp); | |
01dac67e JSP |
295 | } |
296 | ||
297 | return (error); | |
a1fa407d JSP |
298 | } |
299 | ||
12abe7b1 JSP |
300 | int |
301 | union_create(ap) | |
302 | struct vop_create_args /* { | |
303 | struct vnode *a_dvp; | |
304 | struct vnode **a_vpp; | |
305 | struct componentname *a_cnp; | |
306 | struct vattr *a_vap; | |
307 | } */ *ap; | |
308 | { | |
309 | struct union_node *un = VTOUNION(ap->a_dvp); | |
310 | struct vnode *dvp = un->un_uppervp; | |
311 | ||
050766c6 | 312 | if (dvp != NULLVP) { |
12abe7b1 JSP |
313 | int error; |
314 | struct vnode *vp; | |
12abe7b1 | 315 | |
c1b204a8 JSP |
316 | FIXUP(un); |
317 | ||
12abe7b1 | 318 | VREF(dvp); |
e2a2f3a7 | 319 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
320 | vput(ap->a_dvp); |
321 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
322 | if (error) | |
323 | return (error); | |
324 | ||
325 | error = union_allocvp( | |
326 | ap->a_vpp, | |
79f80c71 JSP |
327 | ap->a_dvp->v_mount, |
328 | ap->a_dvp, | |
01dac67e | 329 | NULLVP, |
12abe7b1 JSP |
330 | ap->a_cnp, |
331 | vp, | |
332 | NULLVP); | |
01dac67e | 333 | if (error) |
e2a2f3a7 | 334 | vput(vp); |
12abe7b1 JSP |
335 | return (error); |
336 | } | |
337 | ||
338 | vput(ap->a_dvp); | |
339 | return (EROFS); | |
340 | } | |
341 | ||
342 | int | |
343 | union_mknod(ap) | |
344 | struct vop_mknod_args /* { | |
345 | struct vnode *a_dvp; | |
346 | struct vnode **a_vpp; | |
347 | struct componentname *a_cnp; | |
348 | struct vattr *a_vap; | |
349 | } */ *ap; | |
350 | { | |
351 | struct union_node *un = VTOUNION(ap->a_dvp); | |
352 | struct vnode *dvp = un->un_uppervp; | |
353 | ||
050766c6 | 354 | if (dvp != NULLVP) { |
12abe7b1 JSP |
355 | int error; |
356 | struct vnode *vp; | |
12abe7b1 | 357 | |
c1b204a8 JSP |
358 | FIXUP(un); |
359 | ||
12abe7b1 | 360 | VREF(dvp); |
e2a2f3a7 | 361 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
362 | vput(ap->a_dvp); |
363 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
364 | if (error) | |
365 | return (error); | |
366 | ||
050766c6 | 367 | if (vp != NULLVP) { |
01dac67e JSP |
368 | error = union_allocvp( |
369 | ap->a_vpp, | |
79f80c71 JSP |
370 | ap->a_dvp->v_mount, |
371 | ap->a_dvp, | |
01dac67e JSP |
372 | NULLVP, |
373 | ap->a_cnp, | |
374 | vp, | |
375 | NULLVP); | |
01dac67e | 376 | if (error) |
e2a2f3a7 | 377 | vput(vp); |
01dac67e | 378 | } |
12abe7b1 JSP |
379 | return (error); |
380 | } | |
381 | ||
382 | vput(ap->a_dvp); | |
383 | return (EROFS); | |
384 | } | |
385 | ||
a1fa407d JSP |
386 | int |
387 | union_open(ap) | |
388 | struct vop_open_args /* { | |
389 | struct vnodeop_desc *a_desc; | |
390 | struct vnode *a_vp; | |
391 | int a_mode; | |
392 | struct ucred *a_cred; | |
393 | struct proc *a_p; | |
394 | } */ *ap; | |
395 | { | |
396 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 397 | struct vnode *tvp; |
a1fa407d JSP |
398 | int mode = ap->a_mode; |
399 | struct ucred *cred = ap->a_cred; | |
400 | struct proc *p = ap->a_p; | |
01dac67e | 401 | int error; |
a1fa407d JSP |
402 | |
403 | /* | |
404 | * If there is an existing upper vp then simply open that. | |
405 | */ | |
01dac67e JSP |
406 | tvp = un->un_uppervp; |
407 | if (tvp == NULLVP) { | |
a1fa407d | 408 | /* |
01dac67e JSP |
409 | * If the lower vnode is being opened for writing, then |
410 | * copy the file contents to the upper vnode and open that, | |
411 | * otherwise can simply open the lower vnode. | |
a1fa407d | 412 | */ |
01dac67e JSP |
413 | tvp = un->un_lowervp; |
414 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
6f40eb24 | 415 | error = union_copyup(un, (mode&O_TRUNC) == 0, cred, p); |
01dac67e JSP |
416 | if (error == 0) |
417 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
01dac67e | 418 | return (error); |
a1fa407d | 419 | } |
e2a2f3a7 JSP |
420 | |
421 | /* | |
422 | * Just open the lower vnode | |
423 | */ | |
ed5969c8 | 424 | un->un_openl++; |
e2a2f3a7 JSP |
425 | VOP_LOCK(tvp); |
426 | error = VOP_OPEN(tvp, mode, cred, p); | |
427 | VOP_UNLOCK(tvp); | |
428 | ||
429 | return (error); | |
a1fa407d JSP |
430 | } |
431 | ||
c1b204a8 JSP |
432 | FIXUP(un); |
433 | ||
01dac67e | 434 | error = VOP_OPEN(tvp, mode, cred, p); |
01dac67e JSP |
435 | |
436 | return (error); | |
a1fa407d JSP |
437 | } |
438 | ||
12abe7b1 JSP |
439 | int |
440 | union_close(ap) | |
441 | struct vop_close_args /* { | |
442 | struct vnode *a_vp; | |
443 | int a_fflag; | |
444 | struct ucred *a_cred; | |
445 | struct proc *a_p; | |
446 | } */ *ap; | |
447 | { | |
3b293975 JSP |
448 | struct union_node *un = VTOUNION(ap->a_vp); |
449 | struct vnode *vp; | |
12abe7b1 | 450 | |
050766c6 | 451 | if (un->un_uppervp != NULLVP) { |
3b293975 JSP |
452 | vp = un->un_uppervp; |
453 | } else { | |
ed5969c8 JSP |
454 | #ifdef UNION_DIAGNOSTIC |
455 | if (un->un_openl <= 0) | |
456 | panic("union: un_openl cnt"); | |
3b293975 | 457 | #endif |
ed5969c8 | 458 | --un->un_openl; |
3b293975 JSP |
459 | vp = un->un_lowervp; |
460 | } | |
ed5969c8 | 461 | |
3b293975 | 462 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
463 | } |
464 | ||
465 | /* | |
466 | * Check access permission on the union vnode. | |
467 | * The access check being enforced is to check | |
468 | * against both the underlying vnode, and any | |
469 | * copied vnode. This ensures that no additional | |
470 | * file permissions are given away simply because | |
471 | * the user caused an implicit file copy. | |
472 | */ | |
473 | int | |
474 | union_access(ap) | |
475 | struct vop_access_args /* { | |
476 | struct vnodeop_desc *a_desc; | |
477 | struct vnode *a_vp; | |
478 | int a_mode; | |
479 | struct ucred *a_cred; | |
480 | struct proc *a_p; | |
481 | } */ *ap; | |
482 | { | |
483 | struct union_node *un = VTOUNION(ap->a_vp); | |
7315c41f | 484 | int error = EACCES; |
12abe7b1 JSP |
485 | struct vnode *vp; |
486 | ||
050766c6 | 487 | if ((vp = un->un_uppervp) != NULLVP) { |
c1b204a8 JSP |
488 | FIXUP(un); |
489 | return (VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p)); | |
490 | } | |
491 | ||
050766c6 | 492 | if ((vp = un->un_lowervp) != NULLVP) { |
01dac67e | 493 | VOP_LOCK(vp); |
12abe7b1 | 494 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
c1b204a8 JSP |
495 | if (error == 0) { |
496 | struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount); | |
497 | ||
498 | if (um->um_op == UNMNT_BELOW) | |
499 | error = VOP_ACCESS(vp, ap->a_mode, | |
500 | um->um_cred, ap->a_p); | |
501 | } | |
01dac67e | 502 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
503 | if (error) |
504 | return (error); | |
505 | } | |
506 | ||
01dac67e | 507 | return (error); |
12abe7b1 JSP |
508 | } |
509 | ||
a1fa407d | 510 | /* |
8a9c17f6 JSP |
511 | * We handle getattr only to change the fsid and |
512 | * track object sizes | |
a1fa407d JSP |
513 | */ |
514 | int | |
515 | union_getattr(ap) | |
516 | struct vop_getattr_args /* { | |
517 | struct vnode *a_vp; | |
518 | struct vattr *a_vap; | |
519 | struct ucred *a_cred; | |
520 | struct proc *a_p; | |
521 | } */ *ap; | |
522 | { | |
523 | int error; | |
0931f2d9 JSP |
524 | struct union_node *un = VTOUNION(ap->a_vp); |
525 | struct vnode *vp = un->un_uppervp; | |
526 | struct vattr *vap; | |
527 | struct vattr va; | |
528 | ||
529 | ||
530 | /* | |
531 | * Some programs walk the filesystem hierarchy by counting | |
532 | * links to directories to avoid stat'ing all the time. | |
533 | * This means the link count on directories needs to be "correct". | |
534 | * The only way to do that is to call getattr on both layers | |
535 | * and fix up the link count. The link count will not necessarily | |
536 | * be accurate but will be large enough to defeat the tree walkers. | |
537 | */ | |
538 | ||
539 | vap = ap->a_vap; | |
540 | ||
541 | vp = un->un_uppervp; | |
542 | if (vp != NULLVP) { | |
463c0360 JSP |
543 | /* |
544 | * It's not clear whether VOP_GETATTR is to be | |
545 | * called with the vnode locked or not. stat() calls | |
546 | * it with (vp) locked, and fstat calls it with | |
547 | * (vp) unlocked. | |
548 | * In the mean time, compensate here by checking | |
549 | * the union_node's lock flag. | |
550 | */ | |
551 | if (un->un_flags & UN_LOCKED) | |
552 | FIXUP(un); | |
553 | ||
0931f2d9 JSP |
554 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
555 | if (error) | |
556 | return (error); | |
8a9c17f6 | 557 | union_newsize(ap->a_vp, vap->va_size, VNOVAL); |
0931f2d9 | 558 | } |
01dac67e | 559 | |
0931f2d9 JSP |
560 | if (vp == NULLVP) { |
561 | vp = un->un_lowervp; | |
562 | } else if (vp->v_type == VDIR) { | |
563 | vp = un->un_lowervp; | |
564 | vap = &va; | |
565 | } else { | |
566 | vp = NULLVP; | |
567 | } | |
568 | ||
569 | if (vp != NULLVP) { | |
e2a2f3a7 | 570 | VOP_LOCK(vp); |
0931f2d9 | 571 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
e2a2f3a7 | 572 | VOP_UNLOCK(vp); |
0931f2d9 JSP |
573 | if (error) |
574 | return (error); | |
8a9c17f6 | 575 | union_newsize(ap->a_vp, VNOVAL, vap->va_size); |
0931f2d9 JSP |
576 | } |
577 | ||
578 | if ((vap != ap->a_vap) && (vap->va_type == VDIR)) | |
579 | ap->a_vap->va_nlink += vap->va_nlink; | |
a1fa407d | 580 | |
8de82e02 | 581 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; |
a1fa407d JSP |
582 | return (0); |
583 | } | |
584 | ||
a1fa407d | 585 | int |
01dac67e | 586 | union_setattr(ap) |
12abe7b1 | 587 | struct vop_setattr_args /* { |
a1fa407d | 588 | struct vnode *a_vp; |
12abe7b1 | 589 | struct vattr *a_vap; |
a1fa407d | 590 | struct ucred *a_cred; |
12abe7b1 | 591 | struct proc *a_p; |
a1fa407d JSP |
592 | } */ *ap; |
593 | { | |
594 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 595 | int error; |
a1fa407d | 596 | |
d596128e JSP |
597 | /* |
598 | * Handle case of truncating lower object to zero size, | |
599 | * by creating a zero length upper object. This is to | |
600 | * handle the case of open with O_TRUNC and O_CREAT. | |
601 | */ | |
602 | if ((un->un_uppervp == NULLVP) && | |
603 | /* assert(un->un_lowervp != NULLVP) */ | |
604 | (un->un_lowervp->v_type == VREG) && | |
605 | (ap->a_vap->va_size == 0)) { | |
606 | struct vnode *vp; | |
607 | ||
608 | error = union_vn_create(&vp, un, ap->a_p); | |
609 | if (error) | |
610 | return (error); | |
611 | ||
612 | /* at this point, uppervp is locked */ | |
613 | union_newupper(un, vp); | |
614 | ||
615 | VOP_UNLOCK(vp); | |
616 | union_vn_close(un->un_uppervp, FWRITE, ap->a_cred, ap->a_p); | |
617 | VOP_LOCK(vp); | |
618 | un->un_flags |= UN_ULOCK; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Try to set attributes in upper layer, | |
623 | * otherwise return read-only filesystem error. | |
624 | */ | |
625 | if (un->un_uppervp != NULLVP) { | |
c1b204a8 | 626 | FIXUP(un); |
12abe7b1 JSP |
627 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, |
628 | ap->a_cred, ap->a_p); | |
8a9c17f6 JSP |
629 | if ((error == 0) && (ap->a_vap->va_size != VNOVAL)) |
630 | union_newsize(ap->a_vp, ap->a_vap->va_size, VNOVAL); | |
12abe7b1 | 631 | } else { |
12abe7b1 JSP |
632 | error = EROFS; |
633 | } | |
a1fa407d | 634 | |
12abe7b1 | 635 | return (error); |
a1fa407d JSP |
636 | } |
637 | ||
638 | int | |
12abe7b1 JSP |
639 | union_read(ap) |
640 | struct vop_read_args /* { | |
a1fa407d | 641 | struct vnode *a_vp; |
12abe7b1 JSP |
642 | struct uio *a_uio; |
643 | int a_ioflag; | |
644 | struct ucred *a_cred; | |
a1fa407d JSP |
645 | } */ *ap; |
646 | { | |
12abe7b1 JSP |
647 | int error; |
648 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 649 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 650 | |
e2a2f3a7 JSP |
651 | if (dolock) |
652 | VOP_LOCK(vp); | |
c1b204a8 JSP |
653 | else |
654 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 655 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
656 | if (dolock) |
657 | VOP_UNLOCK(vp); | |
12abe7b1 | 658 | |
8a9c17f6 JSP |
659 | /* |
660 | * XXX | |
661 | * perhaps the size of the underlying object has changed under | |
662 | * our feet. take advantage of the offset information present | |
663 | * in the uio structure. | |
664 | */ | |
665 | if (error == 0) { | |
666 | struct union_node *un = VTOUNION(ap->a_vp); | |
667 | off_t cur = ap->a_uio->uio_offset; | |
668 | ||
669 | if (vp == un->un_uppervp) { | |
670 | if (cur > un->un_uppersz) | |
671 | union_newsize(ap->a_vp, cur, VNOVAL); | |
672 | } else { | |
673 | if (cur > un->un_lowersz) | |
674 | union_newsize(ap->a_vp, VNOVAL, cur); | |
675 | } | |
676 | } | |
677 | ||
12abe7b1 | 678 | return (error); |
a1fa407d JSP |
679 | } |
680 | ||
681 | int | |
12abe7b1 JSP |
682 | union_write(ap) |
683 | struct vop_read_args /* { | |
a1fa407d | 684 | struct vnode *a_vp; |
12abe7b1 JSP |
685 | struct uio *a_uio; |
686 | int a_ioflag; | |
687 | struct ucred *a_cred; | |
a1fa407d JSP |
688 | } */ *ap; |
689 | { | |
12abe7b1 JSP |
690 | int error; |
691 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 692 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 693 | |
e2a2f3a7 JSP |
694 | if (dolock) |
695 | VOP_LOCK(vp); | |
c1b204a8 JSP |
696 | else |
697 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 698 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
699 | if (dolock) |
700 | VOP_UNLOCK(vp); | |
a1fa407d | 701 | |
8a9c17f6 JSP |
702 | /* |
703 | * the size of the underlying object may be changed by the | |
704 | * write. | |
705 | */ | |
706 | if (error == 0) { | |
707 | struct union_node *un = VTOUNION(ap->a_vp); | |
708 | off_t cur = ap->a_uio->uio_offset; | |
709 | ||
710 | if (vp == un->un_uppervp) { | |
711 | if (cur > un->un_uppersz) | |
712 | union_newsize(ap->a_vp, cur, VNOVAL); | |
713 | } else { | |
714 | if (cur > un->un_lowersz) | |
715 | union_newsize(ap->a_vp, VNOVAL, cur); | |
716 | } | |
717 | } | |
718 | ||
12abe7b1 JSP |
719 | return (error); |
720 | } | |
a1fa407d JSP |
721 | |
722 | int | |
12abe7b1 JSP |
723 | union_ioctl(ap) |
724 | struct vop_ioctl_args /* { | |
a1fa407d | 725 | struct vnode *a_vp; |
12abe7b1 JSP |
726 | int a_command; |
727 | caddr_t a_data; | |
728 | int a_fflag; | |
729 | struct ucred *a_cred; | |
730 | struct proc *a_p; | |
a1fa407d JSP |
731 | } */ *ap; |
732 | { | |
a1fa407d | 733 | |
12abe7b1 JSP |
734 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
735 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
736 | } |
737 | ||
a1fa407d | 738 | int |
12abe7b1 JSP |
739 | union_select(ap) |
740 | struct vop_select_args /* { | |
741 | struct vnode *a_vp; | |
742 | int a_which; | |
743 | int a_fflags; | |
744 | struct ucred *a_cred; | |
745 | struct proc *a_p; | |
746 | } */ *ap; | |
747 | { | |
748 | ||
749 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
750 | ap->a_cred, ap->a_p)); | |
751 | } | |
752 | ||
753 | int | |
754 | union_mmap(ap) | |
755 | struct vop_mmap_args /* { | |
756 | struct vnode *a_vp; | |
757 | int a_fflags; | |
758 | struct ucred *a_cred; | |
759 | struct proc *a_p; | |
760 | } */ *ap; | |
761 | { | |
762 | ||
763 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
764 | ap->a_cred, ap->a_p)); | |
765 | } | |
766 | ||
767 | int | |
768 | union_fsync(ap) | |
769 | struct vop_fsync_args /* { | |
770 | struct vnode *a_vp; | |
771 | struct ucred *a_cred; | |
772 | int a_waitfor; | |
773 | struct proc *a_p; | |
774 | } */ *ap; | |
775 | { | |
776 | int error = 0; | |
777 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
778 | ||
050766c6 | 779 | if (targetvp != NULLVP) { |
e2a2f3a7 JSP |
780 | int dolock = (targetvp == LOWERVP(ap->a_vp)); |
781 | ||
782 | if (dolock) | |
783 | VOP_LOCK(targetvp); | |
c1b204a8 JSP |
784 | else |
785 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 JSP |
786 | error = VOP_FSYNC(targetvp, ap->a_cred, |
787 | ap->a_waitfor, ap->a_p); | |
e2a2f3a7 JSP |
788 | if (dolock) |
789 | VOP_UNLOCK(targetvp); | |
12abe7b1 JSP |
790 | } |
791 | ||
792 | return (error); | |
793 | } | |
794 | ||
795 | int | |
796 | union_seek(ap) | |
797 | struct vop_seek_args /* { | |
798 | struct vnode *a_vp; | |
799 | off_t a_oldoff; | |
800 | off_t a_newoff; | |
801 | struct ucred *a_cred; | |
802 | } */ *ap; | |
803 | { | |
804 | ||
805 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
806 | } | |
807 | ||
808 | int | |
809 | union_remove(ap) | |
810 | struct vop_remove_args /* { | |
811 | struct vnode *a_dvp; | |
812 | struct vnode *a_vp; | |
813 | struct componentname *a_cnp; | |
a1fa407d JSP |
814 | } */ *ap; |
815 | { | |
a1fa407d | 816 | int error; |
12abe7b1 JSP |
817 | struct union_node *dun = VTOUNION(ap->a_dvp); |
818 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 819 | |
050766c6 | 820 | if (dun->un_uppervp != NULLVP && un->un_uppervp != NULLVP) { |
12abe7b1 JSP |
821 | struct vnode *dvp = dun->un_uppervp; |
822 | struct vnode *vp = un->un_uppervp; | |
a1fa407d | 823 | |
c1b204a8 | 824 | FIXUP(dun); |
12abe7b1 | 825 | VREF(dvp); |
e2a2f3a7 | 826 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 827 | vput(ap->a_dvp); |
c1b204a8 | 828 | FIXUP(un); |
12abe7b1 | 829 | VREF(vp); |
e2a2f3a7 | 830 | un->un_flags |= UN_KLOCK; |
12abe7b1 | 831 | vput(ap->a_vp); |
a1fa407d | 832 | |
12abe7b1 | 833 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
834 | if (!error) |
835 | union_removed_upper(un); | |
836 | ||
837 | /* | |
838 | * XXX: should create a whiteout here | |
839 | */ | |
12abe7b1 JSP |
840 | } else { |
841 | /* | |
842 | * XXX: should create a whiteout here | |
843 | */ | |
844 | vput(ap->a_dvp); | |
845 | vput(ap->a_vp); | |
846 | error = EROFS; | |
847 | } | |
848 | ||
849 | return (error); | |
850 | } | |
851 | ||
852 | int | |
853 | union_link(ap) | |
854 | struct vop_link_args /* { | |
855 | struct vnode *a_vp; | |
856 | struct vnode *a_tdvp; | |
857 | struct componentname *a_cnp; | |
858 | } */ *ap; | |
859 | { | |
6f40eb24 JSP |
860 | int error = 0; |
861 | struct union_node *un; | |
862 | struct vnode *vp; | |
863 | struct vnode *tdvp; | |
12abe7b1 | 864 | |
6f40eb24 | 865 | un = VTOUNION(ap->a_vp); |
12abe7b1 | 866 | |
6f40eb24 JSP |
867 | if (ap->a_vp->v_op != ap->a_tdvp->v_op) { |
868 | tdvp = ap->a_tdvp; | |
12abe7b1 | 869 | } else { |
6f40eb24 JSP |
870 | struct union_node *tdun = VTOUNION(ap->a_tdvp); |
871 | if (tdun->un_uppervp == NULLVP) { | |
872 | VOP_LOCK(ap->a_tdvp); | |
873 | if (un->un_uppervp == tdun->un_dirvp) { | |
874 | un->un_flags &= ~UN_ULOCK; | |
875 | VOP_UNLOCK(un->un_uppervp); | |
876 | } | |
877 | error = union_copyup(tdun, 1, ap->a_cnp->cn_cred, | |
878 | ap->a_cnp->cn_proc); | |
879 | if (un->un_uppervp == tdun->un_dirvp) { | |
880 | VOP_LOCK(un->un_uppervp); | |
881 | un->un_flags |= UN_ULOCK; | |
882 | } | |
883 | VOP_UNLOCK(ap->a_tdvp); | |
884 | } | |
885 | tdvp = tdun->un_uppervp; | |
886 | } | |
887 | ||
888 | vp = un->un_uppervp; | |
889 | if (vp == NULLVP) | |
12abe7b1 | 890 | error = EROFS; |
6f40eb24 JSP |
891 | |
892 | if (error) { | |
893 | vput(ap->a_vp); | |
894 | return (error); | |
12abe7b1 | 895 | } |
a1fa407d | 896 | |
6f40eb24 JSP |
897 | FIXUP(un); |
898 | VREF(vp); | |
899 | un->un_flags |= UN_KLOCK; | |
900 | vput(ap->a_vp); | |
901 | ||
902 | return (VOP_LINK(vp, tdvp, ap->a_cnp)); | |
a1fa407d JSP |
903 | } |
904 | ||
12abe7b1 JSP |
905 | int |
906 | union_rename(ap) | |
907 | struct vop_rename_args /* { | |
908 | struct vnode *a_fdvp; | |
909 | struct vnode *a_fvp; | |
910 | struct componentname *a_fcnp; | |
911 | struct vnode *a_tdvp; | |
912 | struct vnode *a_tvp; | |
913 | struct componentname *a_tcnp; | |
914 | } */ *ap; | |
915 | { | |
916 | int error; | |
917 | ||
918 | struct vnode *fdvp = ap->a_fdvp; | |
919 | struct vnode *fvp = ap->a_fvp; | |
920 | struct vnode *tdvp = ap->a_tdvp; | |
921 | struct vnode *tvp = ap->a_tvp; | |
922 | ||
923 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
924 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 925 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
926 | error = EROFS; |
927 | goto bad; | |
928 | } | |
929 | ||
930 | fdvp = un->un_uppervp; | |
931 | VREF(fdvp); | |
932 | vrele(ap->a_fdvp); | |
933 | } | |
934 | ||
935 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
936 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 937 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
938 | error = EROFS; |
939 | goto bad; | |
940 | } | |
941 | ||
942 | fvp = un->un_uppervp; | |
943 | VREF(fvp); | |
944 | vrele(ap->a_fvp); | |
945 | } | |
946 | ||
947 | if (tdvp->v_op == union_vnodeop_p) { | |
948 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 949 | if (un->un_uppervp == NULLVP) { |
050766c6 JSP |
950 | /* |
951 | * this should never happen in normal | |
952 | * operation but might if there was | |
953 | * a problem creating the top-level shadow | |
954 | * directory. | |
955 | */ | |
12abe7b1 JSP |
956 | error = EROFS; |
957 | goto bad; | |
958 | } | |
959 | ||
960 | tdvp = un->un_uppervp; | |
961 | VREF(tdvp); | |
e2a2f3a7 | 962 | un->un_flags |= UN_KLOCK; |
3b293975 | 963 | vput(ap->a_tdvp); |
12abe7b1 JSP |
964 | } |
965 | ||
050766c6 | 966 | if (tvp != NULLVP && tvp->v_op == union_vnodeop_p) { |
12abe7b1 | 967 | struct union_node *un = VTOUNION(tvp); |
12abe7b1 JSP |
968 | |
969 | tvp = un->un_uppervp; | |
050766c6 JSP |
970 | if (tvp != NULLVP) { |
971 | VREF(tvp); | |
972 | un->un_flags |= UN_KLOCK; | |
973 | } | |
12abe7b1 JSP |
974 | vput(ap->a_tvp); |
975 | } | |
976 | ||
977 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
978 | ||
979 | bad: | |
980 | vrele(fdvp); | |
981 | vrele(fvp); | |
982 | vput(tdvp); | |
050766c6 | 983 | if (tvp != NULLVP) |
12abe7b1 JSP |
984 | vput(tvp); |
985 | ||
986 | return (error); | |
987 | } | |
988 | ||
989 | int | |
990 | union_mkdir(ap) | |
991 | struct vop_mkdir_args /* { | |
992 | struct vnode *a_dvp; | |
993 | struct vnode **a_vpp; | |
994 | struct componentname *a_cnp; | |
995 | struct vattr *a_vap; | |
996 | } */ *ap; | |
997 | { | |
998 | struct union_node *un = VTOUNION(ap->a_dvp); | |
999 | struct vnode *dvp = un->un_uppervp; | |
1000 | ||
050766c6 | 1001 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1002 | int error; |
1003 | struct vnode *vp; | |
12abe7b1 | 1004 | |
c1b204a8 | 1005 | FIXUP(un); |
12abe7b1 | 1006 | VREF(dvp); |
e2a2f3a7 | 1007 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1008 | vput(ap->a_dvp); |
1009 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); | |
1010 | if (error) | |
1011 | return (error); | |
1012 | ||
1013 | error = union_allocvp( | |
1014 | ap->a_vpp, | |
79f80c71 JSP |
1015 | ap->a_dvp->v_mount, |
1016 | ap->a_dvp, | |
01dac67e | 1017 | NULLVP, |
12abe7b1 JSP |
1018 | ap->a_cnp, |
1019 | vp, | |
1020 | NULLVP); | |
01dac67e | 1021 | if (error) |
e2a2f3a7 | 1022 | vput(vp); |
12abe7b1 JSP |
1023 | return (error); |
1024 | } | |
1025 | ||
1026 | vput(ap->a_dvp); | |
1027 | return (EROFS); | |
1028 | } | |
1029 | ||
1030 | int | |
1031 | union_rmdir(ap) | |
1032 | struct vop_rmdir_args /* { | |
1033 | struct vnode *a_dvp; | |
1034 | struct vnode *a_vp; | |
1035 | struct componentname *a_cnp; | |
1036 | } */ *ap; | |
1037 | { | |
1038 | int error; | |
1039 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
1040 | struct union_node *un = VTOUNION(ap->a_vp); | |
1041 | ||
050766c6 | 1042 | if (dun->un_uppervp != NULLVP && un->un_uppervp != NULLVP) { |
12abe7b1 JSP |
1043 | struct vnode *dvp = dun->un_uppervp; |
1044 | struct vnode *vp = un->un_uppervp; | |
1045 | ||
c1b204a8 | 1046 | FIXUP(dun); |
12abe7b1 | 1047 | VREF(dvp); |
e2a2f3a7 | 1048 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 1049 | vput(ap->a_dvp); |
c1b204a8 | 1050 | FIXUP(un); |
12abe7b1 | 1051 | VREF(vp); |
e2a2f3a7 | 1052 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1053 | vput(ap->a_vp); |
1054 | ||
e2a2f3a7 | 1055 | error = VOP_RMDIR(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
1056 | if (!error) |
1057 | union_removed_upper(un); | |
1058 | ||
1059 | /* | |
1060 | * XXX: should create a whiteout here | |
1061 | */ | |
12abe7b1 JSP |
1062 | } else { |
1063 | /* | |
1064 | * XXX: should create a whiteout here | |
1065 | */ | |
1066 | vput(ap->a_dvp); | |
1067 | vput(ap->a_vp); | |
1068 | error = EROFS; | |
1069 | } | |
1070 | ||
1071 | return (error); | |
1072 | } | |
1073 | ||
1074 | int | |
1075 | union_symlink(ap) | |
1076 | struct vop_symlink_args /* { | |
1077 | struct vnode *a_dvp; | |
1078 | struct vnode **a_vpp; | |
1079 | struct componentname *a_cnp; | |
1080 | struct vattr *a_vap; | |
1081 | char *a_target; | |
1082 | } */ *ap; | |
1083 | { | |
1084 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1085 | struct vnode *dvp = un->un_uppervp; | |
1086 | ||
050766c6 | 1087 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1088 | int error; |
1089 | struct vnode *vp; | |
1090 | struct mount *mp = ap->a_dvp->v_mount; | |
1091 | ||
c1b204a8 | 1092 | FIXUP(un); |
12abe7b1 | 1093 | VREF(dvp); |
e2a2f3a7 | 1094 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1095 | vput(ap->a_dvp); |
1096 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
1097 | ap->a_vap, ap->a_target); | |
3b293975 | 1098 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
1099 | return (error); |
1100 | } | |
1101 | ||
1102 | vput(ap->a_dvp); | |
1103 | return (EROFS); | |
1104 | } | |
a1fa407d JSP |
1105 | |
1106 | /* | |
12abe7b1 JSP |
1107 | * union_readdir works in concert with getdirentries and |
1108 | * readdir(3) to provide a list of entries in the unioned | |
1109 | * directories. getdirentries is responsible for walking | |
1110 | * down the union stack. readdir(3) is responsible for | |
1111 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
1112 | */ |
1113 | int | |
12abe7b1 JSP |
1114 | union_readdir(ap) |
1115 | struct vop_readdir_args /* { | |
1116 | struct vnodeop_desc *a_desc; | |
1117 | struct vnode *a_vp; | |
1118 | struct uio *a_uio; | |
1119 | struct ucred *a_cred; | |
94b29fae KM |
1120 | int *a_eofflag; |
1121 | u_long *a_cookies; | |
1122 | int a_ncookies; | |
12abe7b1 JSP |
1123 | } */ *ap; |
1124 | { | |
94b29fae KM |
1125 | register struct union_node *un = VTOUNION(ap->a_vp); |
1126 | register struct vnode *uvp = un->un_uppervp; | |
12abe7b1 | 1127 | |
94b29fae KM |
1128 | if (uvp == NULLVP) |
1129 | return (0); | |
12abe7b1 | 1130 | |
94b29fae KM |
1131 | FIXUP(un); |
1132 | ap->a_vp = uvp; | |
1133 | return (VOCALL(uvp->v_op, VOFFSET(vop_readdir), ap)); | |
12abe7b1 JSP |
1134 | } |
1135 | ||
1136 | int | |
1137 | union_readlink(ap) | |
1138 | struct vop_readlink_args /* { | |
1139 | struct vnode *a_vp; | |
1140 | struct uio *a_uio; | |
1141 | struct ucred *a_cred; | |
a1fa407d JSP |
1142 | } */ *ap; |
1143 | { | |
a1fa407d | 1144 | int error; |
12abe7b1 | 1145 | struct vnode *vp = OTHERVP(ap->a_vp); |
e2a2f3a7 | 1146 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 1147 | |
e2a2f3a7 JSP |
1148 | if (dolock) |
1149 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1150 | else |
1151 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1152 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); |
e2a2f3a7 JSP |
1153 | if (dolock) |
1154 | VOP_UNLOCK(vp); | |
a1fa407d | 1155 | |
12abe7b1 JSP |
1156 | return (error); |
1157 | } | |
a1fa407d | 1158 | |
12abe7b1 JSP |
1159 | int |
1160 | union_abortop(ap) | |
1161 | struct vop_abortop_args /* { | |
1162 | struct vnode *a_dvp; | |
1163 | struct componentname *a_cnp; | |
1164 | } */ *ap; | |
1165 | { | |
1166 | int error; | |
01dac67e | 1167 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1168 | struct union_node *un = VTOUNION(ap->a_dvp); |
1169 | int islocked = un->un_flags & UN_LOCKED; | |
e2a2f3a7 | 1170 | int dolock = (vp == LOWERVP(ap->a_dvp)); |
a1fa407d | 1171 | |
c1b204a8 JSP |
1172 | if (islocked) { |
1173 | if (dolock) | |
1174 | VOP_LOCK(vp); | |
1175 | else | |
1176 | FIXUP(VTOUNION(ap->a_dvp)); | |
1177 | } | |
12abe7b1 | 1178 | error = VOP_ABORTOP(vp, ap->a_cnp); |
e2a2f3a7 | 1179 | if (islocked && dolock) |
12abe7b1 | 1180 | VOP_UNLOCK(vp); |
a1fa407d JSP |
1181 | |
1182 | return (error); | |
1183 | } | |
1184 | ||
12abe7b1 JSP |
1185 | int |
1186 | union_inactive(ap) | |
1187 | struct vop_inactive_args /* { | |
1188 | struct vnode *a_vp; | |
1189 | } */ *ap; | |
1190 | { | |
463c0360 | 1191 | struct union_node *un = VTOUNION(ap->a_vp); |
12abe7b1 JSP |
1192 | |
1193 | /* | |
1194 | * Do nothing (and _don't_ bypass). | |
1195 | * Wait to vrele lowervp until reclaim, | |
1196 | * so that until then our union_node is in the | |
1197 | * cache and reusable. | |
1198 | * | |
1199 | * NEEDSWORK: Someday, consider inactive'ing | |
1200 | * the lowervp and then trying to reactivate it | |
1201 | * with capabilities (v_id) | |
1202 | * like they do in the name lookup cache code. | |
1203 | * That's too much work for now. | |
1204 | */ | |
79f80c71 | 1205 | |
ed5969c8 | 1206 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1207 | if (un->un_flags & UN_LOCKED) |
1208 | panic("union: inactivating locked node"); | |
463c0360 JSP |
1209 | if (un->un_flags & UN_ULOCK) |
1210 | panic("union: inactivating w/locked upper node"); | |
79f80c71 JSP |
1211 | #endif |
1212 | ||
463c0360 JSP |
1213 | if ((un->un_flags & UN_CACHED) == 0) |
1214 | vgone(ap->a_vp); | |
1215 | ||
12abe7b1 JSP |
1216 | return (0); |
1217 | } | |
1218 | ||
1219 | int | |
1220 | union_reclaim(ap) | |
1221 | struct vop_reclaim_args /* { | |
1222 | struct vnode *a_vp; | |
1223 | } */ *ap; | |
1224 | { | |
12abe7b1 | 1225 | |
58572fc0 JSP |
1226 | union_freevp(ap->a_vp); |
1227 | ||
12abe7b1 JSP |
1228 | return (0); |
1229 | } | |
1230 | ||
a1fa407d JSP |
1231 | int |
1232 | union_lock(ap) | |
1233 | struct vop_lock_args *ap; | |
1234 | { | |
7315c41f JSP |
1235 | struct vnode *vp = ap->a_vp; |
1236 | struct union_node *un; | |
1237 | ||
1238 | start: | |
1239 | while (vp->v_flag & VXLOCK) { | |
1240 | vp->v_flag |= VXWANT; | |
1241 | sleep((caddr_t)vp, PINOD); | |
1242 | } | |
1243 | ||
1244 | un = VTOUNION(vp); | |
a1fa407d | 1245 | |
050766c6 | 1246 | if (un->un_uppervp != NULLVP) { |
2e2839fc JSP |
1247 | if (((un->un_flags & UN_ULOCK) == 0) && |
1248 | (vp->v_usecount != 0)) { | |
e2a2f3a7 | 1249 | un->un_flags |= UN_ULOCK; |
7315c41f | 1250 | VOP_LOCK(un->un_uppervp); |
e2a2f3a7 JSP |
1251 | } |
1252 | #ifdef DIAGNOSTIC | |
1253 | if (un->un_flags & UN_KLOCK) | |
1254 | panic("union: dangling upper lock"); | |
1255 | #endif | |
1256 | } | |
1257 | ||
7315c41f | 1258 | if (un->un_flags & UN_LOCKED) { |
a1fa407d | 1259 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1260 | if (curproc && un->un_pid == curproc->p_pid && |
1261 | un->un_pid > -1 && curproc->p_pid > -1) | |
1262 | panic("union: locking against myself"); | |
a1fa407d | 1263 | #endif |
a1fa407d JSP |
1264 | un->un_flags |= UN_WANT; |
1265 | sleep((caddr_t) &un->un_flags, PINOD); | |
7315c41f | 1266 | goto start; |
a1fa407d | 1267 | } |
79f80c71 | 1268 | |
a1fa407d | 1269 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1270 | if (curproc) |
1271 | un->un_pid = curproc->p_pid; | |
1272 | else | |
1273 | un->un_pid = -1; | |
a1fa407d | 1274 | #endif |
15a86f7e | 1275 | |
7315c41f | 1276 | un->un_flags |= UN_LOCKED; |
15a86f7e | 1277 | return (0); |
a1fa407d JSP |
1278 | } |
1279 | ||
1280 | int | |
1281 | union_unlock(ap) | |
1282 | struct vop_lock_args *ap; | |
1283 | { | |
1284 | struct union_node *un = VTOUNION(ap->a_vp); | |
1285 | ||
1286 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1287 | if ((un->un_flags & UN_LOCKED) == 0) |
1288 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1289 | if (curproc && un->un_pid != curproc->p_pid && |
1290 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1291 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1292 | #endif |
1293 | ||
a1fa407d | 1294 | un->un_flags &= ~UN_LOCKED; |
e2a2f3a7 JSP |
1295 | |
1296 | if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK) | |
1297 | VOP_UNLOCK(un->un_uppervp); | |
1298 | ||
1299 | un->un_flags &= ~(UN_ULOCK|UN_KLOCK); | |
1300 | ||
a1fa407d JSP |
1301 | if (un->un_flags & UN_WANT) { |
1302 | un->un_flags &= ~UN_WANT; | |
1303 | wakeup((caddr_t) &un->un_flags); | |
1304 | } | |
1305 | ||
1306 | #ifdef DIAGNOSTIC | |
1307 | un->un_pid = 0; | |
1308 | #endif | |
15a86f7e JSP |
1309 | |
1310 | return (0); | |
a1fa407d JSP |
1311 | } |
1312 | ||
12abe7b1 JSP |
1313 | int |
1314 | union_bmap(ap) | |
1315 | struct vop_bmap_args /* { | |
1316 | struct vnode *a_vp; | |
1317 | daddr_t a_bn; | |
1318 | struct vnode **a_vpp; | |
1319 | daddr_t *a_bnp; | |
1320 | int *a_runp; | |
1321 | } */ *ap; | |
1322 | { | |
1323 | int error; | |
1324 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1325 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1326 | |
e2a2f3a7 JSP |
1327 | if (dolock) |
1328 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1329 | else |
1330 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1331 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); |
e2a2f3a7 JSP |
1332 | if (dolock) |
1333 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1334 | |
1335 | return (error); | |
1336 | } | |
1337 | ||
1338 | int | |
1339 | union_print(ap) | |
1340 | struct vop_print_args /* { | |
1341 | struct vnode *a_vp; | |
1342 | } */ *ap; | |
1343 | { | |
1344 | struct vnode *vp = ap->a_vp; | |
1345 | ||
1346 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1347 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1348 | return (0); | |
1349 | } | |
1350 | ||
1351 | int | |
1352 | union_islocked(ap) | |
1353 | struct vop_islocked_args /* { | |
1354 | struct vnode *a_vp; | |
1355 | } */ *ap; | |
1356 | { | |
1357 | ||
1358 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1359 | } | |
1360 | ||
1361 | int | |
1362 | union_pathconf(ap) | |
1363 | struct vop_pathconf_args /* { | |
1364 | struct vnode *a_vp; | |
1365 | int a_name; | |
1366 | int *a_retval; | |
1367 | } */ *ap; | |
1368 | { | |
1369 | int error; | |
1370 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1371 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1372 | |
e2a2f3a7 JSP |
1373 | if (dolock) |
1374 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1375 | else |
1376 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1377 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); |
e2a2f3a7 JSP |
1378 | if (dolock) |
1379 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1380 | |
1381 | return (error); | |
1382 | } | |
1383 | ||
1384 | int | |
1385 | union_advlock(ap) | |
1386 | struct vop_advlock_args /* { | |
1387 | struct vnode *a_vp; | |
1388 | caddr_t a_id; | |
1389 | int a_op; | |
1390 | struct flock *a_fl; | |
1391 | int a_flags; | |
1392 | } */ *ap; | |
1393 | { | |
1394 | ||
1395 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1396 | ap->a_fl, ap->a_flags)); | |
1397 | } | |
1398 | ||
1399 | ||
a1fa407d | 1400 | /* |
12abe7b1 JSP |
1401 | * XXX - vop_strategy must be hand coded because it has no |
1402 | * vnode in its arguments. | |
1403 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1404 | */ |
12abe7b1 JSP |
1405 | int |
1406 | union_strategy(ap) | |
1407 | struct vop_strategy_args /* { | |
1408 | struct buf *a_bp; | |
1409 | } */ *ap; | |
1410 | { | |
1411 | struct buf *bp = ap->a_bp; | |
1412 | int error; | |
1413 | struct vnode *savedvp; | |
1414 | ||
1415 | savedvp = bp->b_vp; | |
1416 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1417 | |
12abe7b1 | 1418 | #ifdef DIAGNOSTIC |
3b293975 | 1419 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1420 | panic("union_strategy: nil vp"); |
1421 | if (((bp->b_flags & B_READ) == 0) && | |
1422 | (bp->b_vp == LOWERVP(savedvp))) | |
1423 | panic("union_strategy: writing to lowervp"); | |
1424 | #endif | |
a1fa407d | 1425 | |
12abe7b1 JSP |
1426 | error = VOP_STRATEGY(bp); |
1427 | bp->b_vp = savedvp; | |
a1fa407d | 1428 | |
12abe7b1 JSP |
1429 | return (error); |
1430 | } | |
a1fa407d | 1431 | |
12abe7b1 JSP |
1432 | /* |
1433 | * Global vfs data structures | |
1434 | */ | |
1435 | int (**union_vnodeop_p)(); | |
01dac67e | 1436 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1437 | { &vop_default_desc, vn_default_error }, |
1438 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1439 | { &vop_create_desc, union_create }, /* create */ | |
1440 | { &vop_mknod_desc, union_mknod }, /* mknod */ | |
1441 | { &vop_open_desc, union_open }, /* open */ | |
1442 | { &vop_close_desc, union_close }, /* close */ | |
1443 | { &vop_access_desc, union_access }, /* access */ | |
1444 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1445 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1446 | { &vop_read_desc, union_read }, /* read */ | |
1447 | { &vop_write_desc, union_write }, /* write */ | |
1448 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ | |
1449 | { &vop_select_desc, union_select }, /* select */ | |
1450 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1451 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1452 | { &vop_seek_desc, union_seek }, /* seek */ | |
1453 | { &vop_remove_desc, union_remove }, /* remove */ | |
1454 | { &vop_link_desc, union_link }, /* link */ | |
1455 | { &vop_rename_desc, union_rename }, /* rename */ | |
1456 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1457 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1458 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1459 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1460 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1461 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1462 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1463 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1464 | { &vop_lock_desc, union_lock }, /* lock */ | |
1465 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1466 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1467 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1468 | { &vop_print_desc, union_print }, /* print */ | |
1469 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1470 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1471 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1472 | #ifdef notdef | |
1473 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1474 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1475 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1476 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1477 | { &vop_update_desc, union_update }, /* update */ | |
1478 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1479 | #endif | |
a1fa407d JSP |
1480 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1481 | }; | |
1482 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1483 | { &union_vnodeop_p, union_vnodeop_entries }; |