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 | * | |
5bc3cb24 | 11 | * @(#)union_vnops.c 8.18 (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 | |
5bc3cb24 JSP |
141 | #ifdef notyet |
142 | if (cnp->cn_namelen == 3 && | |
143 | cnp->cn_nameptr[2] == '.' && | |
144 | cnp->cn_nameptr[1] == '.' && | |
145 | cnp->cn_nameptr[0] == '.') { | |
146 | dvp = *ap->a_vpp = LOWERVP(ap->a_dvp); | |
147 | if (dvp == NULLVP) | |
148 | return (ENOENT); | |
149 | VREF(dvp); | |
150 | VOP_LOCK(dvp); | |
151 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
152 | VOP_UNLOCK(ap->a_dvp); | |
153 | return (0); | |
154 | } | |
155 | #endif | |
156 | ||
01dac67e JSP |
157 | cnp->cn_flags |= LOCKPARENT; |
158 | ||
a1fa407d JSP |
159 | upperdvp = dun->un_uppervp; |
160 | lowerdvp = dun->un_lowervp; | |
3b293975 JSP |
161 | uppervp = NULLVP; |
162 | lowervp = NULLVP; | |
a1fa407d JSP |
163 | |
164 | /* | |
165 | * do the lookup in the upper level. | |
166 | * if that level comsumes additional pathnames, | |
167 | * then assume that something special is going | |
168 | * on and just return that vnode. | |
169 | */ | |
050766c6 | 170 | if (upperdvp != NULLVP) { |
c1b204a8 | 171 | FIXUP(dun); |
df24bc61 | 172 | uerror = union_lookup1(um->um_uppervp, &upperdvp, |
3b293975 | 173 | &uppervp, cnp); |
e2a2f3a7 JSP |
174 | /*if (uppervp == upperdvp) |
175 | dun->un_flags |= UN_KLOCK;*/ | |
01dac67e | 176 | |
a1fa407d JSP |
177 | if (cnp->cn_consume != 0) { |
178 | *ap->a_vpp = uppervp; | |
01dac67e JSP |
179 | if (!lockparent) |
180 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
181 | return (uerror); |
182 | } | |
a1fa407d JSP |
183 | } else { |
184 | uerror = ENOENT; | |
185 | } | |
186 | ||
187 | /* | |
188 | * in a similar way to the upper layer, do the lookup | |
189 | * in the lower layer. this time, if there is some | |
190 | * component magic going on, then vput whatever we got | |
191 | * back from the upper layer and return the lower vnode | |
192 | * instead. | |
193 | */ | |
050766c6 | 194 | if (lowerdvp != NULLVP) { |
e2a2f3a7 JSP |
195 | int nameiop; |
196 | ||
01dac67e | 197 | VOP_LOCK(lowerdvp); |
e2a2f3a7 JSP |
198 | |
199 | /* | |
200 | * Only do a LOOKUP on the bottom node, since | |
201 | * we won't be making changes to it anyway. | |
202 | */ | |
203 | nameiop = cnp->cn_nameiop; | |
204 | cnp->cn_nameiop = LOOKUP; | |
c1b204a8 JSP |
205 | if (um->um_op == UNMNT_BELOW) { |
206 | saved_cred = cnp->cn_cred; | |
207 | cnp->cn_cred = um->um_cred; | |
208 | } | |
df24bc61 | 209 | lerror = union_lookup1(um->um_lowervp, &lowerdvp, |
e2a2f3a7 | 210 | &lowervp, cnp); |
c1b204a8 JSP |
211 | if (um->um_op == UNMNT_BELOW) |
212 | cnp->cn_cred = saved_cred; | |
e2a2f3a7 JSP |
213 | cnp->cn_nameiop = nameiop; |
214 | ||
79f80c71 JSP |
215 | if (lowervp != lowerdvp) |
216 | VOP_UNLOCK(lowerdvp); | |
01dac67e | 217 | |
a1fa407d | 218 | if (cnp->cn_consume != 0) { |
050766c6 | 219 | if (uppervp != NULLVP) { |
e2a2f3a7 JSP |
220 | if (uppervp == upperdvp) |
221 | vrele(uppervp); | |
222 | else | |
223 | vput(uppervp); | |
3b293975 | 224 | uppervp = NULLVP; |
a1fa407d JSP |
225 | } |
226 | *ap->a_vpp = lowervp; | |
01dac67e JSP |
227 | if (!lockparent) |
228 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
229 | return (lerror); |
230 | } | |
a1fa407d JSP |
231 | } else { |
232 | lerror = ENOENT; | |
9192c54f JSP |
233 | if ((cnp->cn_flags & ISDOTDOT) && dun->un_pvp != NULLVP) { |
234 | lowervp = LOWERVP(dun->un_pvp); | |
235 | if (lowervp != NULLVP) { | |
236 | VREF(lowervp); | |
237 | VOP_LOCK(lowervp); | |
238 | lerror = 0; | |
239 | } | |
240 | } | |
a1fa407d JSP |
241 | } |
242 | ||
01dac67e JSP |
243 | if (!lockparent) |
244 | cnp->cn_flags &= ~LOCKPARENT; | |
245 | ||
a1fa407d JSP |
246 | /* |
247 | * at this point, we have uerror and lerror indicating | |
248 | * possible errors with the lookups in the upper and lower | |
249 | * layers. additionally, uppervp and lowervp are (locked) | |
250 | * references to existing vnodes in the upper and lower layers. | |
251 | * | |
252 | * there are now three cases to consider. | |
253 | * 1. if both layers returned an error, then return whatever | |
254 | * error the upper layer generated. | |
255 | * | |
256 | * 2. if the top layer failed and the bottom layer succeeded | |
257 | * then two subcases occur. | |
258 | * a. the bottom vnode is not a directory, in which | |
259 | * case just return a new union vnode referencing | |
260 | * an empty top layer and the existing bottom layer. | |
261 | * b. the bottom vnode is a directory, in which case | |
262 | * create a new directory in the top-level and | |
263 | * continue as in case 3. | |
264 | * | |
265 | * 3. if the top layer succeeded then return a new union | |
266 | * vnode referencing whatever the new top layer and | |
267 | * whatever the bottom layer returned. | |
268 | */ | |
269 | ||
ed5969c8 JSP |
270 | *ap->a_vpp = NULLVP; |
271 | ||
a1fa407d JSP |
272 | /* case 1. */ |
273 | if ((uerror != 0) && (lerror != 0)) { | |
a1fa407d JSP |
274 | return (uerror); |
275 | } | |
276 | ||
277 | /* case 2. */ | |
278 | if (uerror != 0 /* && (lerror == 0) */ ) { | |
279 | if (lowervp->v_type == VDIR) { /* case 2b. */ | |
e2a2f3a7 JSP |
280 | dun->un_flags &= ~UN_ULOCK; |
281 | VOP_UNLOCK(upperdvp); | |
3b293975 | 282 | uerror = union_mkshadow(um, upperdvp, cnp, &uppervp); |
e2a2f3a7 JSP |
283 | VOP_LOCK(upperdvp); |
284 | dun->un_flags |= UN_ULOCK; | |
285 | ||
a1fa407d | 286 | if (uerror) { |
050766c6 | 287 | if (lowervp != NULLVP) { |
a1fa407d | 288 | vput(lowervp); |
3b293975 | 289 | lowervp = NULLVP; |
a1fa407d JSP |
290 | } |
291 | return (uerror); | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
050766c6 | 296 | if (lowervp != NULLVP) |
01dac67e JSP |
297 | VOP_UNLOCK(lowervp); |
298 | ||
3b293975 JSP |
299 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
300 | uppervp, lowervp); | |
301 | ||
01dac67e | 302 | if (error) { |
050766c6 | 303 | if (uppervp != NULLVP) |
e2a2f3a7 | 304 | vput(uppervp); |
050766c6 | 305 | if (lowervp != NULLVP) |
01dac67e JSP |
306 | vrele(lowervp); |
307 | } else { | |
81be6ee0 JSP |
308 | if (*ap->a_vpp != dvp) |
309 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
310 | VOP_UNLOCK(dvp); | |
01dac67e JSP |
311 | } |
312 | ||
313 | return (error); | |
a1fa407d JSP |
314 | } |
315 | ||
12abe7b1 JSP |
316 | int |
317 | union_create(ap) | |
318 | struct vop_create_args /* { | |
319 | struct vnode *a_dvp; | |
320 | struct vnode **a_vpp; | |
321 | struct componentname *a_cnp; | |
322 | struct vattr *a_vap; | |
323 | } */ *ap; | |
324 | { | |
325 | struct union_node *un = VTOUNION(ap->a_dvp); | |
326 | struct vnode *dvp = un->un_uppervp; | |
327 | ||
050766c6 | 328 | if (dvp != NULLVP) { |
12abe7b1 JSP |
329 | int error; |
330 | struct vnode *vp; | |
12abe7b1 | 331 | |
c1b204a8 JSP |
332 | FIXUP(un); |
333 | ||
12abe7b1 | 334 | VREF(dvp); |
e2a2f3a7 | 335 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
336 | vput(ap->a_dvp); |
337 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
338 | if (error) | |
339 | return (error); | |
340 | ||
341 | error = union_allocvp( | |
342 | ap->a_vpp, | |
79f80c71 JSP |
343 | ap->a_dvp->v_mount, |
344 | ap->a_dvp, | |
01dac67e | 345 | NULLVP, |
12abe7b1 JSP |
346 | ap->a_cnp, |
347 | vp, | |
348 | NULLVP); | |
01dac67e | 349 | if (error) |
e2a2f3a7 | 350 | vput(vp); |
12abe7b1 JSP |
351 | return (error); |
352 | } | |
353 | ||
354 | vput(ap->a_dvp); | |
355 | return (EROFS); | |
356 | } | |
357 | ||
358 | int | |
359 | union_mknod(ap) | |
360 | struct vop_mknod_args /* { | |
361 | struct vnode *a_dvp; | |
362 | struct vnode **a_vpp; | |
363 | struct componentname *a_cnp; | |
364 | struct vattr *a_vap; | |
365 | } */ *ap; | |
366 | { | |
367 | struct union_node *un = VTOUNION(ap->a_dvp); | |
368 | struct vnode *dvp = un->un_uppervp; | |
369 | ||
050766c6 | 370 | if (dvp != NULLVP) { |
12abe7b1 JSP |
371 | int error; |
372 | struct vnode *vp; | |
12abe7b1 | 373 | |
c1b204a8 JSP |
374 | FIXUP(un); |
375 | ||
12abe7b1 | 376 | VREF(dvp); |
e2a2f3a7 | 377 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
378 | vput(ap->a_dvp); |
379 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
380 | if (error) | |
381 | return (error); | |
382 | ||
050766c6 | 383 | if (vp != NULLVP) { |
01dac67e JSP |
384 | error = union_allocvp( |
385 | ap->a_vpp, | |
79f80c71 JSP |
386 | ap->a_dvp->v_mount, |
387 | ap->a_dvp, | |
01dac67e JSP |
388 | NULLVP, |
389 | ap->a_cnp, | |
390 | vp, | |
391 | NULLVP); | |
01dac67e | 392 | if (error) |
e2a2f3a7 | 393 | vput(vp); |
01dac67e | 394 | } |
12abe7b1 JSP |
395 | return (error); |
396 | } | |
397 | ||
398 | vput(ap->a_dvp); | |
399 | return (EROFS); | |
400 | } | |
401 | ||
a1fa407d JSP |
402 | int |
403 | union_open(ap) | |
404 | struct vop_open_args /* { | |
405 | struct vnodeop_desc *a_desc; | |
406 | struct vnode *a_vp; | |
407 | int a_mode; | |
408 | struct ucred *a_cred; | |
409 | struct proc *a_p; | |
410 | } */ *ap; | |
411 | { | |
412 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 413 | struct vnode *tvp; |
a1fa407d JSP |
414 | int mode = ap->a_mode; |
415 | struct ucred *cred = ap->a_cred; | |
416 | struct proc *p = ap->a_p; | |
01dac67e | 417 | int error; |
a1fa407d JSP |
418 | |
419 | /* | |
420 | * If there is an existing upper vp then simply open that. | |
421 | */ | |
01dac67e JSP |
422 | tvp = un->un_uppervp; |
423 | if (tvp == NULLVP) { | |
a1fa407d | 424 | /* |
01dac67e JSP |
425 | * If the lower vnode is being opened for writing, then |
426 | * copy the file contents to the upper vnode and open that, | |
427 | * otherwise can simply open the lower vnode. | |
a1fa407d | 428 | */ |
01dac67e JSP |
429 | tvp = un->un_lowervp; |
430 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
6f40eb24 | 431 | error = union_copyup(un, (mode&O_TRUNC) == 0, cred, p); |
01dac67e JSP |
432 | if (error == 0) |
433 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
01dac67e | 434 | return (error); |
a1fa407d | 435 | } |
e2a2f3a7 JSP |
436 | |
437 | /* | |
438 | * Just open the lower vnode | |
439 | */ | |
ed5969c8 | 440 | un->un_openl++; |
e2a2f3a7 JSP |
441 | VOP_LOCK(tvp); |
442 | error = VOP_OPEN(tvp, mode, cred, p); | |
443 | VOP_UNLOCK(tvp); | |
444 | ||
445 | return (error); | |
a1fa407d JSP |
446 | } |
447 | ||
c1b204a8 JSP |
448 | FIXUP(un); |
449 | ||
01dac67e | 450 | error = VOP_OPEN(tvp, mode, cred, p); |
01dac67e JSP |
451 | |
452 | return (error); | |
a1fa407d JSP |
453 | } |
454 | ||
12abe7b1 JSP |
455 | int |
456 | union_close(ap) | |
457 | struct vop_close_args /* { | |
458 | struct vnode *a_vp; | |
459 | int a_fflag; | |
460 | struct ucred *a_cred; | |
461 | struct proc *a_p; | |
462 | } */ *ap; | |
463 | { | |
3b293975 JSP |
464 | struct union_node *un = VTOUNION(ap->a_vp); |
465 | struct vnode *vp; | |
12abe7b1 | 466 | |
050766c6 | 467 | if (un->un_uppervp != NULLVP) { |
3b293975 JSP |
468 | vp = un->un_uppervp; |
469 | } else { | |
ed5969c8 JSP |
470 | #ifdef UNION_DIAGNOSTIC |
471 | if (un->un_openl <= 0) | |
472 | panic("union: un_openl cnt"); | |
3b293975 | 473 | #endif |
ed5969c8 | 474 | --un->un_openl; |
3b293975 JSP |
475 | vp = un->un_lowervp; |
476 | } | |
ed5969c8 | 477 | |
3b293975 | 478 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
479 | } |
480 | ||
481 | /* | |
482 | * Check access permission on the union vnode. | |
483 | * The access check being enforced is to check | |
484 | * against both the underlying vnode, and any | |
485 | * copied vnode. This ensures that no additional | |
486 | * file permissions are given away simply because | |
487 | * the user caused an implicit file copy. | |
488 | */ | |
489 | int | |
490 | union_access(ap) | |
491 | struct vop_access_args /* { | |
492 | struct vnodeop_desc *a_desc; | |
493 | struct vnode *a_vp; | |
494 | int a_mode; | |
495 | struct ucred *a_cred; | |
496 | struct proc *a_p; | |
497 | } */ *ap; | |
498 | { | |
499 | struct union_node *un = VTOUNION(ap->a_vp); | |
7315c41f | 500 | int error = EACCES; |
12abe7b1 JSP |
501 | struct vnode *vp; |
502 | ||
050766c6 | 503 | if ((vp = un->un_uppervp) != NULLVP) { |
c1b204a8 JSP |
504 | FIXUP(un); |
505 | return (VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p)); | |
506 | } | |
507 | ||
050766c6 | 508 | if ((vp = un->un_lowervp) != NULLVP) { |
01dac67e | 509 | VOP_LOCK(vp); |
12abe7b1 | 510 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
c1b204a8 JSP |
511 | if (error == 0) { |
512 | struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount); | |
513 | ||
514 | if (um->um_op == UNMNT_BELOW) | |
515 | error = VOP_ACCESS(vp, ap->a_mode, | |
516 | um->um_cred, ap->a_p); | |
517 | } | |
01dac67e | 518 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
519 | if (error) |
520 | return (error); | |
521 | } | |
522 | ||
01dac67e | 523 | return (error); |
12abe7b1 JSP |
524 | } |
525 | ||
a1fa407d | 526 | /* |
8a9c17f6 JSP |
527 | * We handle getattr only to change the fsid and |
528 | * track object sizes | |
a1fa407d JSP |
529 | */ |
530 | int | |
531 | union_getattr(ap) | |
532 | struct vop_getattr_args /* { | |
533 | struct vnode *a_vp; | |
534 | struct vattr *a_vap; | |
535 | struct ucred *a_cred; | |
536 | struct proc *a_p; | |
537 | } */ *ap; | |
538 | { | |
539 | int error; | |
0931f2d9 JSP |
540 | struct union_node *un = VTOUNION(ap->a_vp); |
541 | struct vnode *vp = un->un_uppervp; | |
542 | struct vattr *vap; | |
543 | struct vattr va; | |
544 | ||
545 | ||
546 | /* | |
547 | * Some programs walk the filesystem hierarchy by counting | |
548 | * links to directories to avoid stat'ing all the time. | |
549 | * This means the link count on directories needs to be "correct". | |
550 | * The only way to do that is to call getattr on both layers | |
551 | * and fix up the link count. The link count will not necessarily | |
552 | * be accurate but will be large enough to defeat the tree walkers. | |
553 | */ | |
554 | ||
555 | vap = ap->a_vap; | |
556 | ||
557 | vp = un->un_uppervp; | |
558 | if (vp != NULLVP) { | |
463c0360 JSP |
559 | /* |
560 | * It's not clear whether VOP_GETATTR is to be | |
561 | * called with the vnode locked or not. stat() calls | |
562 | * it with (vp) locked, and fstat calls it with | |
563 | * (vp) unlocked. | |
564 | * In the mean time, compensate here by checking | |
565 | * the union_node's lock flag. | |
566 | */ | |
567 | if (un->un_flags & UN_LOCKED) | |
568 | FIXUP(un); | |
569 | ||
0931f2d9 JSP |
570 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
571 | if (error) | |
572 | return (error); | |
8a9c17f6 | 573 | union_newsize(ap->a_vp, vap->va_size, VNOVAL); |
0931f2d9 | 574 | } |
01dac67e | 575 | |
0931f2d9 JSP |
576 | if (vp == NULLVP) { |
577 | vp = un->un_lowervp; | |
578 | } else if (vp->v_type == VDIR) { | |
579 | vp = un->un_lowervp; | |
580 | vap = &va; | |
581 | } else { | |
582 | vp = NULLVP; | |
583 | } | |
584 | ||
585 | if (vp != NULLVP) { | |
e2a2f3a7 | 586 | VOP_LOCK(vp); |
0931f2d9 | 587 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
e2a2f3a7 | 588 | VOP_UNLOCK(vp); |
0931f2d9 JSP |
589 | if (error) |
590 | return (error); | |
8a9c17f6 | 591 | union_newsize(ap->a_vp, VNOVAL, vap->va_size); |
0931f2d9 JSP |
592 | } |
593 | ||
594 | if ((vap != ap->a_vap) && (vap->va_type == VDIR)) | |
595 | ap->a_vap->va_nlink += vap->va_nlink; | |
a1fa407d | 596 | |
8de82e02 | 597 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; |
a1fa407d JSP |
598 | return (0); |
599 | } | |
600 | ||
a1fa407d | 601 | int |
01dac67e | 602 | union_setattr(ap) |
12abe7b1 | 603 | struct vop_setattr_args /* { |
a1fa407d | 604 | struct vnode *a_vp; |
12abe7b1 | 605 | struct vattr *a_vap; |
a1fa407d | 606 | struct ucred *a_cred; |
12abe7b1 | 607 | struct proc *a_p; |
a1fa407d JSP |
608 | } */ *ap; |
609 | { | |
610 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 611 | int error; |
a1fa407d | 612 | |
d596128e JSP |
613 | /* |
614 | * Handle case of truncating lower object to zero size, | |
615 | * by creating a zero length upper object. This is to | |
616 | * handle the case of open with O_TRUNC and O_CREAT. | |
617 | */ | |
618 | if ((un->un_uppervp == NULLVP) && | |
619 | /* assert(un->un_lowervp != NULLVP) */ | |
620 | (un->un_lowervp->v_type == VREG) && | |
621 | (ap->a_vap->va_size == 0)) { | |
622 | struct vnode *vp; | |
623 | ||
624 | error = union_vn_create(&vp, un, ap->a_p); | |
625 | if (error) | |
626 | return (error); | |
627 | ||
628 | /* at this point, uppervp is locked */ | |
629 | union_newupper(un, vp); | |
630 | ||
631 | VOP_UNLOCK(vp); | |
632 | union_vn_close(un->un_uppervp, FWRITE, ap->a_cred, ap->a_p); | |
633 | VOP_LOCK(vp); | |
634 | un->un_flags |= UN_ULOCK; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Try to set attributes in upper layer, | |
639 | * otherwise return read-only filesystem error. | |
640 | */ | |
641 | if (un->un_uppervp != NULLVP) { | |
c1b204a8 | 642 | FIXUP(un); |
12abe7b1 JSP |
643 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, |
644 | ap->a_cred, ap->a_p); | |
8a9c17f6 JSP |
645 | if ((error == 0) && (ap->a_vap->va_size != VNOVAL)) |
646 | union_newsize(ap->a_vp, ap->a_vap->va_size, VNOVAL); | |
12abe7b1 | 647 | } else { |
12abe7b1 JSP |
648 | error = EROFS; |
649 | } | |
a1fa407d | 650 | |
12abe7b1 | 651 | return (error); |
a1fa407d JSP |
652 | } |
653 | ||
654 | int | |
12abe7b1 JSP |
655 | union_read(ap) |
656 | struct vop_read_args /* { | |
a1fa407d | 657 | struct vnode *a_vp; |
12abe7b1 JSP |
658 | struct uio *a_uio; |
659 | int a_ioflag; | |
660 | struct ucred *a_cred; | |
a1fa407d JSP |
661 | } */ *ap; |
662 | { | |
12abe7b1 JSP |
663 | int error; |
664 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 665 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 666 | |
e2a2f3a7 JSP |
667 | if (dolock) |
668 | VOP_LOCK(vp); | |
c1b204a8 JSP |
669 | else |
670 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 671 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
672 | if (dolock) |
673 | VOP_UNLOCK(vp); | |
12abe7b1 | 674 | |
8a9c17f6 JSP |
675 | /* |
676 | * XXX | |
677 | * perhaps the size of the underlying object has changed under | |
678 | * our feet. take advantage of the offset information present | |
679 | * in the uio structure. | |
680 | */ | |
681 | if (error == 0) { | |
682 | struct union_node *un = VTOUNION(ap->a_vp); | |
683 | off_t cur = ap->a_uio->uio_offset; | |
684 | ||
685 | if (vp == un->un_uppervp) { | |
686 | if (cur > un->un_uppersz) | |
687 | union_newsize(ap->a_vp, cur, VNOVAL); | |
688 | } else { | |
689 | if (cur > un->un_lowersz) | |
690 | union_newsize(ap->a_vp, VNOVAL, cur); | |
691 | } | |
692 | } | |
693 | ||
12abe7b1 | 694 | return (error); |
a1fa407d JSP |
695 | } |
696 | ||
697 | int | |
12abe7b1 JSP |
698 | union_write(ap) |
699 | struct vop_read_args /* { | |
a1fa407d | 700 | struct vnode *a_vp; |
12abe7b1 JSP |
701 | struct uio *a_uio; |
702 | int a_ioflag; | |
703 | struct ucred *a_cred; | |
a1fa407d JSP |
704 | } */ *ap; |
705 | { | |
12abe7b1 JSP |
706 | int error; |
707 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 708 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 709 | |
e2a2f3a7 JSP |
710 | if (dolock) |
711 | VOP_LOCK(vp); | |
c1b204a8 JSP |
712 | else |
713 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 714 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
715 | if (dolock) |
716 | VOP_UNLOCK(vp); | |
a1fa407d | 717 | |
8a9c17f6 JSP |
718 | /* |
719 | * the size of the underlying object may be changed by the | |
720 | * write. | |
721 | */ | |
722 | if (error == 0) { | |
723 | struct union_node *un = VTOUNION(ap->a_vp); | |
724 | off_t cur = ap->a_uio->uio_offset; | |
725 | ||
726 | if (vp == un->un_uppervp) { | |
727 | if (cur > un->un_uppersz) | |
728 | union_newsize(ap->a_vp, cur, VNOVAL); | |
729 | } else { | |
730 | if (cur > un->un_lowersz) | |
731 | union_newsize(ap->a_vp, VNOVAL, cur); | |
732 | } | |
733 | } | |
734 | ||
12abe7b1 JSP |
735 | return (error); |
736 | } | |
a1fa407d JSP |
737 | |
738 | int | |
12abe7b1 JSP |
739 | union_ioctl(ap) |
740 | struct vop_ioctl_args /* { | |
a1fa407d | 741 | struct vnode *a_vp; |
12abe7b1 JSP |
742 | int a_command; |
743 | caddr_t a_data; | |
744 | int a_fflag; | |
745 | struct ucred *a_cred; | |
746 | struct proc *a_p; | |
a1fa407d JSP |
747 | } */ *ap; |
748 | { | |
a1fa407d | 749 | |
12abe7b1 JSP |
750 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
751 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
752 | } |
753 | ||
a1fa407d | 754 | int |
12abe7b1 JSP |
755 | union_select(ap) |
756 | struct vop_select_args /* { | |
757 | struct vnode *a_vp; | |
758 | int a_which; | |
759 | int a_fflags; | |
760 | struct ucred *a_cred; | |
761 | struct proc *a_p; | |
762 | } */ *ap; | |
763 | { | |
764 | ||
765 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
766 | ap->a_cred, ap->a_p)); | |
767 | } | |
768 | ||
769 | int | |
770 | union_mmap(ap) | |
771 | struct vop_mmap_args /* { | |
772 | struct vnode *a_vp; | |
773 | int a_fflags; | |
774 | struct ucred *a_cred; | |
775 | struct proc *a_p; | |
776 | } */ *ap; | |
777 | { | |
778 | ||
779 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
780 | ap->a_cred, ap->a_p)); | |
781 | } | |
782 | ||
783 | int | |
784 | union_fsync(ap) | |
785 | struct vop_fsync_args /* { | |
786 | struct vnode *a_vp; | |
787 | struct ucred *a_cred; | |
788 | int a_waitfor; | |
789 | struct proc *a_p; | |
790 | } */ *ap; | |
791 | { | |
792 | int error = 0; | |
793 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
794 | ||
050766c6 | 795 | if (targetvp != NULLVP) { |
e2a2f3a7 JSP |
796 | int dolock = (targetvp == LOWERVP(ap->a_vp)); |
797 | ||
798 | if (dolock) | |
799 | VOP_LOCK(targetvp); | |
c1b204a8 JSP |
800 | else |
801 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 JSP |
802 | error = VOP_FSYNC(targetvp, ap->a_cred, |
803 | ap->a_waitfor, ap->a_p); | |
e2a2f3a7 JSP |
804 | if (dolock) |
805 | VOP_UNLOCK(targetvp); | |
12abe7b1 JSP |
806 | } |
807 | ||
808 | return (error); | |
809 | } | |
810 | ||
811 | int | |
812 | union_seek(ap) | |
813 | struct vop_seek_args /* { | |
814 | struct vnode *a_vp; | |
815 | off_t a_oldoff; | |
816 | off_t a_newoff; | |
817 | struct ucred *a_cred; | |
818 | } */ *ap; | |
819 | { | |
820 | ||
821 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
822 | } | |
823 | ||
824 | int | |
825 | union_remove(ap) | |
826 | struct vop_remove_args /* { | |
827 | struct vnode *a_dvp; | |
828 | struct vnode *a_vp; | |
829 | struct componentname *a_cnp; | |
a1fa407d JSP |
830 | } */ *ap; |
831 | { | |
a1fa407d | 832 | int error; |
12abe7b1 JSP |
833 | struct union_node *dun = VTOUNION(ap->a_dvp); |
834 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 835 | |
050766c6 | 836 | if (dun->un_uppervp != NULLVP && un->un_uppervp != NULLVP) { |
12abe7b1 JSP |
837 | struct vnode *dvp = dun->un_uppervp; |
838 | struct vnode *vp = un->un_uppervp; | |
a1fa407d | 839 | |
c1b204a8 | 840 | FIXUP(dun); |
12abe7b1 | 841 | VREF(dvp); |
e2a2f3a7 | 842 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 843 | vput(ap->a_dvp); |
c1b204a8 | 844 | FIXUP(un); |
12abe7b1 | 845 | VREF(vp); |
e2a2f3a7 | 846 | un->un_flags |= UN_KLOCK; |
12abe7b1 | 847 | vput(ap->a_vp); |
a1fa407d | 848 | |
12abe7b1 | 849 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
850 | if (!error) |
851 | union_removed_upper(un); | |
852 | ||
853 | /* | |
854 | * XXX: should create a whiteout here | |
855 | */ | |
12abe7b1 JSP |
856 | } else { |
857 | /* | |
858 | * XXX: should create a whiteout here | |
859 | */ | |
860 | vput(ap->a_dvp); | |
861 | vput(ap->a_vp); | |
862 | error = EROFS; | |
863 | } | |
864 | ||
865 | return (error); | |
866 | } | |
867 | ||
868 | int | |
869 | union_link(ap) | |
870 | struct vop_link_args /* { | |
871 | struct vnode *a_vp; | |
872 | struct vnode *a_tdvp; | |
873 | struct componentname *a_cnp; | |
874 | } */ *ap; | |
875 | { | |
6f40eb24 JSP |
876 | int error = 0; |
877 | struct union_node *un; | |
878 | struct vnode *vp; | |
879 | struct vnode *tdvp; | |
12abe7b1 | 880 | |
6f40eb24 | 881 | un = VTOUNION(ap->a_vp); |
12abe7b1 | 882 | |
6f40eb24 JSP |
883 | if (ap->a_vp->v_op != ap->a_tdvp->v_op) { |
884 | tdvp = ap->a_tdvp; | |
12abe7b1 | 885 | } else { |
6f40eb24 JSP |
886 | struct union_node *tdun = VTOUNION(ap->a_tdvp); |
887 | if (tdun->un_uppervp == NULLVP) { | |
888 | VOP_LOCK(ap->a_tdvp); | |
889 | if (un->un_uppervp == tdun->un_dirvp) { | |
890 | un->un_flags &= ~UN_ULOCK; | |
891 | VOP_UNLOCK(un->un_uppervp); | |
892 | } | |
893 | error = union_copyup(tdun, 1, ap->a_cnp->cn_cred, | |
894 | ap->a_cnp->cn_proc); | |
895 | if (un->un_uppervp == tdun->un_dirvp) { | |
896 | VOP_LOCK(un->un_uppervp); | |
897 | un->un_flags |= UN_ULOCK; | |
898 | } | |
899 | VOP_UNLOCK(ap->a_tdvp); | |
900 | } | |
901 | tdvp = tdun->un_uppervp; | |
902 | } | |
903 | ||
904 | vp = un->un_uppervp; | |
905 | if (vp == NULLVP) | |
12abe7b1 | 906 | error = EROFS; |
6f40eb24 JSP |
907 | |
908 | if (error) { | |
909 | vput(ap->a_vp); | |
910 | return (error); | |
12abe7b1 | 911 | } |
a1fa407d | 912 | |
6f40eb24 JSP |
913 | FIXUP(un); |
914 | VREF(vp); | |
915 | un->un_flags |= UN_KLOCK; | |
916 | vput(ap->a_vp); | |
917 | ||
918 | return (VOP_LINK(vp, tdvp, ap->a_cnp)); | |
a1fa407d JSP |
919 | } |
920 | ||
12abe7b1 JSP |
921 | int |
922 | union_rename(ap) | |
923 | struct vop_rename_args /* { | |
924 | struct vnode *a_fdvp; | |
925 | struct vnode *a_fvp; | |
926 | struct componentname *a_fcnp; | |
927 | struct vnode *a_tdvp; | |
928 | struct vnode *a_tvp; | |
929 | struct componentname *a_tcnp; | |
930 | } */ *ap; | |
931 | { | |
932 | int error; | |
933 | ||
934 | struct vnode *fdvp = ap->a_fdvp; | |
935 | struct vnode *fvp = ap->a_fvp; | |
936 | struct vnode *tdvp = ap->a_tdvp; | |
937 | struct vnode *tvp = ap->a_tvp; | |
938 | ||
939 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
940 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 941 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
942 | error = EROFS; |
943 | goto bad; | |
944 | } | |
945 | ||
946 | fdvp = un->un_uppervp; | |
947 | VREF(fdvp); | |
948 | vrele(ap->a_fdvp); | |
949 | } | |
950 | ||
951 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
952 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 953 | if (un->un_uppervp == NULLVP) { |
12abe7b1 JSP |
954 | error = EROFS; |
955 | goto bad; | |
956 | } | |
957 | ||
958 | fvp = un->un_uppervp; | |
959 | VREF(fvp); | |
960 | vrele(ap->a_fvp); | |
961 | } | |
962 | ||
963 | if (tdvp->v_op == union_vnodeop_p) { | |
964 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 965 | if (un->un_uppervp == NULLVP) { |
050766c6 JSP |
966 | /* |
967 | * this should never happen in normal | |
968 | * operation but might if there was | |
969 | * a problem creating the top-level shadow | |
970 | * directory. | |
971 | */ | |
12abe7b1 JSP |
972 | error = EROFS; |
973 | goto bad; | |
974 | } | |
975 | ||
976 | tdvp = un->un_uppervp; | |
977 | VREF(tdvp); | |
e2a2f3a7 | 978 | un->un_flags |= UN_KLOCK; |
3b293975 | 979 | vput(ap->a_tdvp); |
12abe7b1 JSP |
980 | } |
981 | ||
050766c6 | 982 | if (tvp != NULLVP && tvp->v_op == union_vnodeop_p) { |
12abe7b1 | 983 | struct union_node *un = VTOUNION(tvp); |
12abe7b1 JSP |
984 | |
985 | tvp = un->un_uppervp; | |
050766c6 JSP |
986 | if (tvp != NULLVP) { |
987 | VREF(tvp); | |
988 | un->un_flags |= UN_KLOCK; | |
989 | } | |
12abe7b1 JSP |
990 | vput(ap->a_tvp); |
991 | } | |
992 | ||
993 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
994 | ||
995 | bad: | |
996 | vrele(fdvp); | |
997 | vrele(fvp); | |
998 | vput(tdvp); | |
050766c6 | 999 | if (tvp != NULLVP) |
12abe7b1 JSP |
1000 | vput(tvp); |
1001 | ||
1002 | return (error); | |
1003 | } | |
1004 | ||
1005 | int | |
1006 | union_mkdir(ap) | |
1007 | struct vop_mkdir_args /* { | |
1008 | struct vnode *a_dvp; | |
1009 | struct vnode **a_vpp; | |
1010 | struct componentname *a_cnp; | |
1011 | struct vattr *a_vap; | |
1012 | } */ *ap; | |
1013 | { | |
1014 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1015 | struct vnode *dvp = un->un_uppervp; | |
1016 | ||
050766c6 | 1017 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1018 | int error; |
1019 | struct vnode *vp; | |
12abe7b1 | 1020 | |
c1b204a8 | 1021 | FIXUP(un); |
12abe7b1 | 1022 | VREF(dvp); |
e2a2f3a7 | 1023 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1024 | vput(ap->a_dvp); |
1025 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); | |
1026 | if (error) | |
1027 | return (error); | |
1028 | ||
1029 | error = union_allocvp( | |
1030 | ap->a_vpp, | |
79f80c71 JSP |
1031 | ap->a_dvp->v_mount, |
1032 | ap->a_dvp, | |
01dac67e | 1033 | NULLVP, |
12abe7b1 JSP |
1034 | ap->a_cnp, |
1035 | vp, | |
1036 | NULLVP); | |
01dac67e | 1037 | if (error) |
e2a2f3a7 | 1038 | vput(vp); |
12abe7b1 JSP |
1039 | return (error); |
1040 | } | |
1041 | ||
1042 | vput(ap->a_dvp); | |
1043 | return (EROFS); | |
1044 | } | |
1045 | ||
1046 | int | |
1047 | union_rmdir(ap) | |
1048 | struct vop_rmdir_args /* { | |
1049 | struct vnode *a_dvp; | |
1050 | struct vnode *a_vp; | |
1051 | struct componentname *a_cnp; | |
1052 | } */ *ap; | |
1053 | { | |
1054 | int error; | |
1055 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
1056 | struct union_node *un = VTOUNION(ap->a_vp); | |
1057 | ||
050766c6 | 1058 | if (dun->un_uppervp != NULLVP && un->un_uppervp != NULLVP) { |
12abe7b1 JSP |
1059 | struct vnode *dvp = dun->un_uppervp; |
1060 | struct vnode *vp = un->un_uppervp; | |
1061 | ||
c1b204a8 | 1062 | FIXUP(dun); |
12abe7b1 | 1063 | VREF(dvp); |
e2a2f3a7 | 1064 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 1065 | vput(ap->a_dvp); |
c1b204a8 | 1066 | FIXUP(un); |
12abe7b1 | 1067 | VREF(vp); |
e2a2f3a7 | 1068 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1069 | vput(ap->a_vp); |
1070 | ||
e2a2f3a7 | 1071 | error = VOP_RMDIR(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
1072 | if (!error) |
1073 | union_removed_upper(un); | |
1074 | ||
1075 | /* | |
1076 | * XXX: should create a whiteout here | |
1077 | */ | |
12abe7b1 JSP |
1078 | } else { |
1079 | /* | |
1080 | * XXX: should create a whiteout here | |
1081 | */ | |
1082 | vput(ap->a_dvp); | |
1083 | vput(ap->a_vp); | |
1084 | error = EROFS; | |
1085 | } | |
1086 | ||
1087 | return (error); | |
1088 | } | |
1089 | ||
1090 | int | |
1091 | union_symlink(ap) | |
1092 | struct vop_symlink_args /* { | |
1093 | struct vnode *a_dvp; | |
1094 | struct vnode **a_vpp; | |
1095 | struct componentname *a_cnp; | |
1096 | struct vattr *a_vap; | |
1097 | char *a_target; | |
1098 | } */ *ap; | |
1099 | { | |
1100 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1101 | struct vnode *dvp = un->un_uppervp; | |
1102 | ||
050766c6 | 1103 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1104 | int error; |
1105 | struct vnode *vp; | |
1106 | struct mount *mp = ap->a_dvp->v_mount; | |
1107 | ||
c1b204a8 | 1108 | FIXUP(un); |
12abe7b1 | 1109 | VREF(dvp); |
e2a2f3a7 | 1110 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1111 | vput(ap->a_dvp); |
1112 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
1113 | ap->a_vap, ap->a_target); | |
3b293975 | 1114 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
1115 | return (error); |
1116 | } | |
1117 | ||
1118 | vput(ap->a_dvp); | |
1119 | return (EROFS); | |
1120 | } | |
a1fa407d JSP |
1121 | |
1122 | /* | |
12abe7b1 JSP |
1123 | * union_readdir works in concert with getdirentries and |
1124 | * readdir(3) to provide a list of entries in the unioned | |
1125 | * directories. getdirentries is responsible for walking | |
1126 | * down the union stack. readdir(3) is responsible for | |
1127 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
1128 | */ |
1129 | int | |
12abe7b1 JSP |
1130 | union_readdir(ap) |
1131 | struct vop_readdir_args /* { | |
1132 | struct vnodeop_desc *a_desc; | |
1133 | struct vnode *a_vp; | |
1134 | struct uio *a_uio; | |
1135 | struct ucred *a_cred; | |
94b29fae KM |
1136 | int *a_eofflag; |
1137 | u_long *a_cookies; | |
1138 | int a_ncookies; | |
12abe7b1 JSP |
1139 | } */ *ap; |
1140 | { | |
94b29fae KM |
1141 | register struct union_node *un = VTOUNION(ap->a_vp); |
1142 | register struct vnode *uvp = un->un_uppervp; | |
12abe7b1 | 1143 | |
94b29fae KM |
1144 | if (uvp == NULLVP) |
1145 | return (0); | |
12abe7b1 | 1146 | |
94b29fae KM |
1147 | FIXUP(un); |
1148 | ap->a_vp = uvp; | |
1149 | return (VOCALL(uvp->v_op, VOFFSET(vop_readdir), ap)); | |
12abe7b1 JSP |
1150 | } |
1151 | ||
1152 | int | |
1153 | union_readlink(ap) | |
1154 | struct vop_readlink_args /* { | |
1155 | struct vnode *a_vp; | |
1156 | struct uio *a_uio; | |
1157 | struct ucred *a_cred; | |
a1fa407d JSP |
1158 | } */ *ap; |
1159 | { | |
a1fa407d | 1160 | int error; |
12abe7b1 | 1161 | struct vnode *vp = OTHERVP(ap->a_vp); |
e2a2f3a7 | 1162 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 1163 | |
e2a2f3a7 JSP |
1164 | if (dolock) |
1165 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1166 | else |
1167 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1168 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); |
e2a2f3a7 JSP |
1169 | if (dolock) |
1170 | VOP_UNLOCK(vp); | |
a1fa407d | 1171 | |
12abe7b1 JSP |
1172 | return (error); |
1173 | } | |
a1fa407d | 1174 | |
12abe7b1 JSP |
1175 | int |
1176 | union_abortop(ap) | |
1177 | struct vop_abortop_args /* { | |
1178 | struct vnode *a_dvp; | |
1179 | struct componentname *a_cnp; | |
1180 | } */ *ap; | |
1181 | { | |
1182 | int error; | |
01dac67e | 1183 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1184 | struct union_node *un = VTOUNION(ap->a_dvp); |
1185 | int islocked = un->un_flags & UN_LOCKED; | |
e2a2f3a7 | 1186 | int dolock = (vp == LOWERVP(ap->a_dvp)); |
a1fa407d | 1187 | |
c1b204a8 JSP |
1188 | if (islocked) { |
1189 | if (dolock) | |
1190 | VOP_LOCK(vp); | |
1191 | else | |
1192 | FIXUP(VTOUNION(ap->a_dvp)); | |
1193 | } | |
12abe7b1 | 1194 | error = VOP_ABORTOP(vp, ap->a_cnp); |
e2a2f3a7 | 1195 | if (islocked && dolock) |
12abe7b1 | 1196 | VOP_UNLOCK(vp); |
a1fa407d JSP |
1197 | |
1198 | return (error); | |
1199 | } | |
1200 | ||
12abe7b1 JSP |
1201 | int |
1202 | union_inactive(ap) | |
1203 | struct vop_inactive_args /* { | |
1204 | struct vnode *a_vp; | |
1205 | } */ *ap; | |
1206 | { | |
463c0360 | 1207 | struct union_node *un = VTOUNION(ap->a_vp); |
12abe7b1 JSP |
1208 | |
1209 | /* | |
1210 | * Do nothing (and _don't_ bypass). | |
1211 | * Wait to vrele lowervp until reclaim, | |
1212 | * so that until then our union_node is in the | |
1213 | * cache and reusable. | |
1214 | * | |
1215 | * NEEDSWORK: Someday, consider inactive'ing | |
1216 | * the lowervp and then trying to reactivate it | |
1217 | * with capabilities (v_id) | |
1218 | * like they do in the name lookup cache code. | |
1219 | * That's too much work for now. | |
1220 | */ | |
79f80c71 | 1221 | |
ed5969c8 | 1222 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1223 | if (un->un_flags & UN_LOCKED) |
1224 | panic("union: inactivating locked node"); | |
463c0360 JSP |
1225 | if (un->un_flags & UN_ULOCK) |
1226 | panic("union: inactivating w/locked upper node"); | |
79f80c71 JSP |
1227 | #endif |
1228 | ||
463c0360 JSP |
1229 | if ((un->un_flags & UN_CACHED) == 0) |
1230 | vgone(ap->a_vp); | |
1231 | ||
12abe7b1 JSP |
1232 | return (0); |
1233 | } | |
1234 | ||
1235 | int | |
1236 | union_reclaim(ap) | |
1237 | struct vop_reclaim_args /* { | |
1238 | struct vnode *a_vp; | |
1239 | } */ *ap; | |
1240 | { | |
12abe7b1 | 1241 | |
58572fc0 JSP |
1242 | union_freevp(ap->a_vp); |
1243 | ||
12abe7b1 JSP |
1244 | return (0); |
1245 | } | |
1246 | ||
a1fa407d JSP |
1247 | int |
1248 | union_lock(ap) | |
1249 | struct vop_lock_args *ap; | |
1250 | { | |
7315c41f JSP |
1251 | struct vnode *vp = ap->a_vp; |
1252 | struct union_node *un; | |
1253 | ||
1254 | start: | |
1255 | while (vp->v_flag & VXLOCK) { | |
1256 | vp->v_flag |= VXWANT; | |
1257 | sleep((caddr_t)vp, PINOD); | |
1258 | } | |
1259 | ||
1260 | un = VTOUNION(vp); | |
a1fa407d | 1261 | |
050766c6 | 1262 | if (un->un_uppervp != NULLVP) { |
2e2839fc JSP |
1263 | if (((un->un_flags & UN_ULOCK) == 0) && |
1264 | (vp->v_usecount != 0)) { | |
e2a2f3a7 | 1265 | un->un_flags |= UN_ULOCK; |
7315c41f | 1266 | VOP_LOCK(un->un_uppervp); |
e2a2f3a7 JSP |
1267 | } |
1268 | #ifdef DIAGNOSTIC | |
1269 | if (un->un_flags & UN_KLOCK) | |
1270 | panic("union: dangling upper lock"); | |
1271 | #endif | |
1272 | } | |
1273 | ||
7315c41f | 1274 | if (un->un_flags & UN_LOCKED) { |
a1fa407d | 1275 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1276 | if (curproc && un->un_pid == curproc->p_pid && |
1277 | un->un_pid > -1 && curproc->p_pid > -1) | |
1278 | panic("union: locking against myself"); | |
a1fa407d | 1279 | #endif |
a1fa407d JSP |
1280 | un->un_flags |= UN_WANT; |
1281 | sleep((caddr_t) &un->un_flags, PINOD); | |
7315c41f | 1282 | goto start; |
a1fa407d | 1283 | } |
79f80c71 | 1284 | |
a1fa407d | 1285 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1286 | if (curproc) |
1287 | un->un_pid = curproc->p_pid; | |
1288 | else | |
1289 | un->un_pid = -1; | |
a1fa407d | 1290 | #endif |
15a86f7e | 1291 | |
7315c41f | 1292 | un->un_flags |= UN_LOCKED; |
15a86f7e | 1293 | return (0); |
a1fa407d JSP |
1294 | } |
1295 | ||
1296 | int | |
1297 | union_unlock(ap) | |
1298 | struct vop_lock_args *ap; | |
1299 | { | |
1300 | struct union_node *un = VTOUNION(ap->a_vp); | |
1301 | ||
1302 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1303 | if ((un->un_flags & UN_LOCKED) == 0) |
1304 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1305 | if (curproc && un->un_pid != curproc->p_pid && |
1306 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1307 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1308 | #endif |
1309 | ||
a1fa407d | 1310 | un->un_flags &= ~UN_LOCKED; |
e2a2f3a7 JSP |
1311 | |
1312 | if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK) | |
1313 | VOP_UNLOCK(un->un_uppervp); | |
1314 | ||
1315 | un->un_flags &= ~(UN_ULOCK|UN_KLOCK); | |
1316 | ||
a1fa407d JSP |
1317 | if (un->un_flags & UN_WANT) { |
1318 | un->un_flags &= ~UN_WANT; | |
1319 | wakeup((caddr_t) &un->un_flags); | |
1320 | } | |
1321 | ||
1322 | #ifdef DIAGNOSTIC | |
1323 | un->un_pid = 0; | |
1324 | #endif | |
15a86f7e JSP |
1325 | |
1326 | return (0); | |
a1fa407d JSP |
1327 | } |
1328 | ||
12abe7b1 JSP |
1329 | int |
1330 | union_bmap(ap) | |
1331 | struct vop_bmap_args /* { | |
1332 | struct vnode *a_vp; | |
1333 | daddr_t a_bn; | |
1334 | struct vnode **a_vpp; | |
1335 | daddr_t *a_bnp; | |
1336 | int *a_runp; | |
1337 | } */ *ap; | |
1338 | { | |
1339 | int error; | |
1340 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1341 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1342 | |
e2a2f3a7 JSP |
1343 | if (dolock) |
1344 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1345 | else |
1346 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1347 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); |
e2a2f3a7 JSP |
1348 | if (dolock) |
1349 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1350 | |
1351 | return (error); | |
1352 | } | |
1353 | ||
1354 | int | |
1355 | union_print(ap) | |
1356 | struct vop_print_args /* { | |
1357 | struct vnode *a_vp; | |
1358 | } */ *ap; | |
1359 | { | |
1360 | struct vnode *vp = ap->a_vp; | |
1361 | ||
1362 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1363 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1364 | return (0); | |
1365 | } | |
1366 | ||
1367 | int | |
1368 | union_islocked(ap) | |
1369 | struct vop_islocked_args /* { | |
1370 | struct vnode *a_vp; | |
1371 | } */ *ap; | |
1372 | { | |
1373 | ||
1374 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1375 | } | |
1376 | ||
1377 | int | |
1378 | union_pathconf(ap) | |
1379 | struct vop_pathconf_args /* { | |
1380 | struct vnode *a_vp; | |
1381 | int a_name; | |
1382 | int *a_retval; | |
1383 | } */ *ap; | |
1384 | { | |
1385 | int error; | |
1386 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1387 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1388 | |
e2a2f3a7 JSP |
1389 | if (dolock) |
1390 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1391 | else |
1392 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1393 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); |
e2a2f3a7 JSP |
1394 | if (dolock) |
1395 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1396 | |
1397 | return (error); | |
1398 | } | |
1399 | ||
1400 | int | |
1401 | union_advlock(ap) | |
1402 | struct vop_advlock_args /* { | |
1403 | struct vnode *a_vp; | |
1404 | caddr_t a_id; | |
1405 | int a_op; | |
1406 | struct flock *a_fl; | |
1407 | int a_flags; | |
1408 | } */ *ap; | |
1409 | { | |
1410 | ||
1411 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1412 | ap->a_fl, ap->a_flags)); | |
1413 | } | |
1414 | ||
1415 | ||
a1fa407d | 1416 | /* |
12abe7b1 JSP |
1417 | * XXX - vop_strategy must be hand coded because it has no |
1418 | * vnode in its arguments. | |
1419 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1420 | */ |
12abe7b1 JSP |
1421 | int |
1422 | union_strategy(ap) | |
1423 | struct vop_strategy_args /* { | |
1424 | struct buf *a_bp; | |
1425 | } */ *ap; | |
1426 | { | |
1427 | struct buf *bp = ap->a_bp; | |
1428 | int error; | |
1429 | struct vnode *savedvp; | |
1430 | ||
1431 | savedvp = bp->b_vp; | |
1432 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1433 | |
12abe7b1 | 1434 | #ifdef DIAGNOSTIC |
3b293975 | 1435 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1436 | panic("union_strategy: nil vp"); |
1437 | if (((bp->b_flags & B_READ) == 0) && | |
1438 | (bp->b_vp == LOWERVP(savedvp))) | |
1439 | panic("union_strategy: writing to lowervp"); | |
1440 | #endif | |
a1fa407d | 1441 | |
12abe7b1 JSP |
1442 | error = VOP_STRATEGY(bp); |
1443 | bp->b_vp = savedvp; | |
a1fa407d | 1444 | |
12abe7b1 JSP |
1445 | return (error); |
1446 | } | |
a1fa407d | 1447 | |
12abe7b1 JSP |
1448 | /* |
1449 | * Global vfs data structures | |
1450 | */ | |
1451 | int (**union_vnodeop_p)(); | |
01dac67e | 1452 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1453 | { &vop_default_desc, vn_default_error }, |
1454 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1455 | { &vop_create_desc, union_create }, /* create */ | |
1456 | { &vop_mknod_desc, union_mknod }, /* mknod */ | |
1457 | { &vop_open_desc, union_open }, /* open */ | |
1458 | { &vop_close_desc, union_close }, /* close */ | |
1459 | { &vop_access_desc, union_access }, /* access */ | |
1460 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1461 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1462 | { &vop_read_desc, union_read }, /* read */ | |
1463 | { &vop_write_desc, union_write }, /* write */ | |
1464 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ | |
1465 | { &vop_select_desc, union_select }, /* select */ | |
1466 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1467 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1468 | { &vop_seek_desc, union_seek }, /* seek */ | |
1469 | { &vop_remove_desc, union_remove }, /* remove */ | |
1470 | { &vop_link_desc, union_link }, /* link */ | |
1471 | { &vop_rename_desc, union_rename }, /* rename */ | |
1472 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1473 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1474 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1475 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1476 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1477 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1478 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1479 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1480 | { &vop_lock_desc, union_lock }, /* lock */ | |
1481 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1482 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1483 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1484 | { &vop_print_desc, union_print }, /* print */ | |
1485 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1486 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1487 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1488 | #ifdef notdef | |
1489 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1490 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1491 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1492 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1493 | { &vop_update_desc, union_update }, /* update */ | |
1494 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1495 | #endif | |
a1fa407d JSP |
1496 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1497 | }; | |
1498 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1499 | { &union_vnodeop_p, union_vnodeop_entries }; |