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 | * | |
1479a47a | 11 | * @(#)union_vnops.c 8.24 (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 | 18 | #include <sys/time.h> |
88edbcd4 | 19 | #include <sys/stat.h> |
a1fa407d JSP |
20 | #include <sys/types.h> |
21 | #include <sys/vnode.h> | |
22 | #include <sys/mount.h> | |
23 | #include <sys/namei.h> | |
24 | #include <sys/malloc.h> | |
25 | #include <sys/buf.h> | |
58572fc0 | 26 | #include <sys/queue.h> |
2e1ae99e | 27 | #include <miscfs/union/union.h> |
a1fa407d | 28 | |
c1b204a8 JSP |
29 | #define FIXUP(un) { \ |
30 | if (((un)->un_flags & UN_ULOCK) == 0) { \ | |
31 | union_fixup(un); \ | |
32 | } \ | |
33 | } | |
34 | ||
35 | static void | |
36 | union_fixup(un) | |
37 | struct union_node *un; | |
38 | { | |
39 | ||
40 | VOP_LOCK(un->un_uppervp); | |
41 | un->un_flags |= UN_ULOCK; | |
42 | } | |
43 | ||
a1fa407d | 44 | static int |
df24bc61 | 45 | union_lookup1(udvp, dvpp, vpp, cnp) |
79f80c71 | 46 | struct vnode *udvp; |
df24bc61 | 47 | struct vnode **dvpp; |
a1fa407d JSP |
48 | struct vnode **vpp; |
49 | struct componentname *cnp; | |
50 | { | |
51 | int error; | |
52 | struct vnode *tdvp; | |
df24bc61 | 53 | struct vnode *dvp; |
a1fa407d JSP |
54 | struct mount *mp; |
55 | ||
df24bc61 JSP |
56 | dvp = *dvpp; |
57 | ||
81be6ee0 JSP |
58 | /* |
59 | * If stepping up the directory tree, check for going | |
60 | * back across the mount point, in which case do what | |
61 | * lookup would do by stepping back down the mount | |
62 | * hierarchy. | |
63 | */ | |
a1fa407d | 64 | if (cnp->cn_flags & ISDOTDOT) { |
df24bc61 | 65 | while ((dvp != udvp) && (dvp->v_flag & VROOT)) { |
692a90df JSP |
66 | /* |
67 | * Don't do the NOCROSSMOUNT check | |
68 | * at this level. By definition, | |
69 | * union fs deals with namespaces, not | |
70 | * filesystems. | |
71 | */ | |
a1fa407d | 72 | tdvp = dvp; |
df24bc61 | 73 | *dvpp = dvp = dvp->v_mount->mnt_vnodecovered; |
a1fa407d JSP |
74 | vput(tdvp); |
75 | VREF(dvp); | |
76 | VOP_LOCK(dvp); | |
77 | } | |
78 | } | |
ed5969c8 | 79 | |
a1fa407d JSP |
80 | error = VOP_LOOKUP(dvp, &tdvp, cnp); |
81 | if (error) | |
82 | return (error); | |
83 | ||
81be6ee0 | 84 | /* |
ed5969c8 JSP |
85 | * The parent directory will have been unlocked, unless lookup |
86 | * found the last component. In which case, re-lock the node | |
87 | * here to allow it to be unlocked again (phew) in union_lookup. | |
81be6ee0 | 88 | */ |
ed5969c8 | 89 | if (dvp != tdvp && !(cnp->cn_flags & ISLASTCN)) |
81be6ee0 JSP |
90 | VOP_LOCK(dvp); |
91 | ||
a1fa407d | 92 | dvp = tdvp; |
81be6ee0 JSP |
93 | |
94 | /* | |
95 | * Lastly check if the current node is a mount point in | |
692a90df | 96 | * which case walk up the mount hierarchy making sure not to |
81be6ee0 JSP |
97 | * bump into the root of the mount tree (ie. dvp != udvp). |
98 | */ | |
79f80c71 | 99 | while (dvp != udvp && (dvp->v_type == VDIR) && |
692a90df | 100 | (mp = dvp->v_mountedhere)) { |
a1fa407d JSP |
101 | |
102 | if (mp->mnt_flag & MNT_MLOCK) { | |
103 | mp->mnt_flag |= MNT_MWAIT; | |
104 | sleep((caddr_t) mp, PVFS); | |
105 | continue; | |
106 | } | |
107 | ||
108 | if (error = VFS_ROOT(mp, &tdvp)) { | |
109 | vput(dvp); | |
110 | return (error); | |
111 | } | |
112 | ||
01dac67e | 113 | vput(dvp); |
a1fa407d JSP |
114 | dvp = tdvp; |
115 | } | |
116 | ||
117 | *vpp = dvp; | |
118 | return (0); | |
119 | } | |
120 | ||
121 | int | |
122 | union_lookup(ap) | |
123 | struct vop_lookup_args /* { | |
124 | struct vnodeop_desc *a_desc; | |
125 | struct vnode *a_dvp; | |
126 | struct vnode **a_vpp; | |
127 | struct componentname *a_cnp; | |
128 | } */ *ap; | |
129 | { | |
01dac67e | 130 | int error; |
a1fa407d JSP |
131 | int uerror, lerror; |
132 | struct vnode *uppervp, *lowervp; | |
133 | struct vnode *upperdvp, *lowerdvp; | |
134 | struct vnode *dvp = ap->a_dvp; | |
79f80c71 | 135 | struct union_node *dun = VTOUNION(dvp); |
a1fa407d JSP |
136 | struct componentname *cnp = ap->a_cnp; |
137 | int lockparent = cnp->cn_flags & LOCKPARENT; | |
81be6ee0 | 138 | int rdonly = cnp->cn_flags & RDONLY; |
3b293975 | 139 | struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount); |
c1b204a8 | 140 | struct ucred *saved_cred; |
88edbcd4 JSP |
141 | int iswhiteout; |
142 | struct vattr va; | |
a1fa407d | 143 | |
5bc3cb24 JSP |
144 | #ifdef notyet |
145 | if (cnp->cn_namelen == 3 && | |
146 | cnp->cn_nameptr[2] == '.' && | |
147 | cnp->cn_nameptr[1] == '.' && | |
148 | cnp->cn_nameptr[0] == '.') { | |
149 | dvp = *ap->a_vpp = LOWERVP(ap->a_dvp); | |
150 | if (dvp == NULLVP) | |
151 | return (ENOENT); | |
152 | VREF(dvp); | |
153 | VOP_LOCK(dvp); | |
154 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
155 | VOP_UNLOCK(ap->a_dvp); | |
156 | return (0); | |
157 | } | |
158 | #endif | |
159 | ||
01dac67e JSP |
160 | cnp->cn_flags |= LOCKPARENT; |
161 | ||
a1fa407d JSP |
162 | upperdvp = dun->un_uppervp; |
163 | lowerdvp = dun->un_lowervp; | |
3b293975 JSP |
164 | uppervp = NULLVP; |
165 | lowervp = NULLVP; | |
88edbcd4 | 166 | iswhiteout = 0; |
a1fa407d JSP |
167 | |
168 | /* | |
169 | * do the lookup in the upper level. | |
170 | * if that level comsumes additional pathnames, | |
171 | * then assume that something special is going | |
172 | * on and just return that vnode. | |
173 | */ | |
050766c6 | 174 | if (upperdvp != NULLVP) { |
c1b204a8 | 175 | FIXUP(dun); |
df24bc61 | 176 | uerror = union_lookup1(um->um_uppervp, &upperdvp, |
3b293975 | 177 | &uppervp, cnp); |
e2a2f3a7 JSP |
178 | /*if (uppervp == upperdvp) |
179 | dun->un_flags |= UN_KLOCK;*/ | |
01dac67e | 180 | |
a1fa407d JSP |
181 | if (cnp->cn_consume != 0) { |
182 | *ap->a_vpp = uppervp; | |
01dac67e JSP |
183 | if (!lockparent) |
184 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
185 | return (uerror); |
186 | } | |
88edbcd4 JSP |
187 | if (uerror == ENOENT || uerror == EJUSTRETURN) { |
188 | if (cnp->cn_flags & ISWHITEOUT) { | |
189 | iswhiteout = 1; | |
190 | } else if (lowerdvp != NULLVP) { | |
191 | lerror = VOP_GETATTR(upperdvp, &va, | |
192 | cnp->cn_cred, cnp->cn_proc); | |
193 | if (lerror == 0 && (va.va_flags & OPAQUE)) | |
194 | iswhiteout = 1; | |
195 | } | |
196 | } | |
a1fa407d JSP |
197 | } else { |
198 | uerror = ENOENT; | |
199 | } | |
200 | ||
201 | /* | |
202 | * in a similar way to the upper layer, do the lookup | |
203 | * in the lower layer. this time, if there is some | |
204 | * component magic going on, then vput whatever we got | |
205 | * back from the upper layer and return the lower vnode | |
206 | * instead. | |
207 | */ | |
88edbcd4 | 208 | if (lowerdvp != NULLVP && !iswhiteout) { |
e2a2f3a7 JSP |
209 | int nameiop; |
210 | ||
01dac67e | 211 | VOP_LOCK(lowerdvp); |
e2a2f3a7 JSP |
212 | |
213 | /* | |
214 | * Only do a LOOKUP on the bottom node, since | |
215 | * we won't be making changes to it anyway. | |
216 | */ | |
217 | nameiop = cnp->cn_nameiop; | |
218 | cnp->cn_nameiop = LOOKUP; | |
c1b204a8 JSP |
219 | if (um->um_op == UNMNT_BELOW) { |
220 | saved_cred = cnp->cn_cred; | |
221 | cnp->cn_cred = um->um_cred; | |
222 | } | |
df24bc61 | 223 | lerror = union_lookup1(um->um_lowervp, &lowerdvp, |
e2a2f3a7 | 224 | &lowervp, cnp); |
c1b204a8 JSP |
225 | if (um->um_op == UNMNT_BELOW) |
226 | cnp->cn_cred = saved_cred; | |
e2a2f3a7 JSP |
227 | cnp->cn_nameiop = nameiop; |
228 | ||
79f80c71 JSP |
229 | if (lowervp != lowerdvp) |
230 | VOP_UNLOCK(lowerdvp); | |
01dac67e | 231 | |
a1fa407d | 232 | if (cnp->cn_consume != 0) { |
050766c6 | 233 | if (uppervp != NULLVP) { |
e2a2f3a7 JSP |
234 | if (uppervp == upperdvp) |
235 | vrele(uppervp); | |
236 | else | |
237 | vput(uppervp); | |
3b293975 | 238 | uppervp = NULLVP; |
a1fa407d JSP |
239 | } |
240 | *ap->a_vpp = lowervp; | |
01dac67e JSP |
241 | if (!lockparent) |
242 | cnp->cn_flags &= ~LOCKPARENT; | |
a1fa407d JSP |
243 | return (lerror); |
244 | } | |
a1fa407d JSP |
245 | } else { |
246 | lerror = ENOENT; | |
9192c54f JSP |
247 | if ((cnp->cn_flags & ISDOTDOT) && dun->un_pvp != NULLVP) { |
248 | lowervp = LOWERVP(dun->un_pvp); | |
249 | if (lowervp != NULLVP) { | |
250 | VREF(lowervp); | |
251 | VOP_LOCK(lowervp); | |
252 | lerror = 0; | |
253 | } | |
254 | } | |
a1fa407d JSP |
255 | } |
256 | ||
01dac67e JSP |
257 | if (!lockparent) |
258 | cnp->cn_flags &= ~LOCKPARENT; | |
259 | ||
a1fa407d JSP |
260 | /* |
261 | * at this point, we have uerror and lerror indicating | |
262 | * possible errors with the lookups in the upper and lower | |
263 | * layers. additionally, uppervp and lowervp are (locked) | |
264 | * references to existing vnodes in the upper and lower layers. | |
265 | * | |
266 | * there are now three cases to consider. | |
267 | * 1. if both layers returned an error, then return whatever | |
268 | * error the upper layer generated. | |
269 | * | |
270 | * 2. if the top layer failed and the bottom layer succeeded | |
271 | * then two subcases occur. | |
272 | * a. the bottom vnode is not a directory, in which | |
273 | * case just return a new union vnode referencing | |
274 | * an empty top layer and the existing bottom layer. | |
275 | * b. the bottom vnode is a directory, in which case | |
276 | * create a new directory in the top-level and | |
277 | * continue as in case 3. | |
278 | * | |
279 | * 3. if the top layer succeeded then return a new union | |
280 | * vnode referencing whatever the new top layer and | |
281 | * whatever the bottom layer returned. | |
282 | */ | |
283 | ||
ed5969c8 JSP |
284 | *ap->a_vpp = NULLVP; |
285 | ||
a1fa407d JSP |
286 | /* case 1. */ |
287 | if ((uerror != 0) && (lerror != 0)) { | |
a1fa407d JSP |
288 | return (uerror); |
289 | } | |
290 | ||
291 | /* case 2. */ | |
292 | if (uerror != 0 /* && (lerror == 0) */ ) { | |
293 | if (lowervp->v_type == VDIR) { /* case 2b. */ | |
e2a2f3a7 JSP |
294 | dun->un_flags &= ~UN_ULOCK; |
295 | VOP_UNLOCK(upperdvp); | |
3b293975 | 296 | uerror = union_mkshadow(um, upperdvp, cnp, &uppervp); |
e2a2f3a7 JSP |
297 | VOP_LOCK(upperdvp); |
298 | dun->un_flags |= UN_ULOCK; | |
299 | ||
a1fa407d | 300 | if (uerror) { |
050766c6 | 301 | if (lowervp != NULLVP) { |
a1fa407d | 302 | vput(lowervp); |
3b293975 | 303 | lowervp = NULLVP; |
a1fa407d JSP |
304 | } |
305 | return (uerror); | |
306 | } | |
307 | } | |
308 | } | |
309 | ||
050766c6 | 310 | if (lowervp != NULLVP) |
01dac67e JSP |
311 | VOP_UNLOCK(lowervp); |
312 | ||
3b293975 | 313 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
825ff80f | 314 | uppervp, lowervp, 1); |
3b293975 | 315 | |
01dac67e | 316 | if (error) { |
050766c6 | 317 | if (uppervp != NULLVP) |
e2a2f3a7 | 318 | vput(uppervp); |
050766c6 | 319 | if (lowervp != NULLVP) |
01dac67e JSP |
320 | vrele(lowervp); |
321 | } else { | |
81be6ee0 JSP |
322 | if (*ap->a_vpp != dvp) |
323 | if (!lockparent || !(cnp->cn_flags & ISLASTCN)) | |
324 | VOP_UNLOCK(dvp); | |
01dac67e JSP |
325 | } |
326 | ||
327 | return (error); | |
a1fa407d JSP |
328 | } |
329 | ||
12abe7b1 JSP |
330 | int |
331 | union_create(ap) | |
332 | struct vop_create_args /* { | |
333 | struct vnode *a_dvp; | |
334 | struct vnode **a_vpp; | |
335 | struct componentname *a_cnp; | |
336 | struct vattr *a_vap; | |
337 | } */ *ap; | |
338 | { | |
339 | struct union_node *un = VTOUNION(ap->a_dvp); | |
340 | struct vnode *dvp = un->un_uppervp; | |
341 | ||
050766c6 | 342 | if (dvp != NULLVP) { |
12abe7b1 JSP |
343 | int error; |
344 | struct vnode *vp; | |
825ff80f | 345 | struct mount *mp; |
12abe7b1 | 346 | |
c1b204a8 JSP |
347 | FIXUP(un); |
348 | ||
12abe7b1 | 349 | VREF(dvp); |
e2a2f3a7 | 350 | un->un_flags |= UN_KLOCK; |
825ff80f | 351 | mp = ap->a_dvp->v_mount; |
12abe7b1 JSP |
352 | vput(ap->a_dvp); |
353 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
354 | if (error) | |
355 | return (error); | |
356 | ||
357 | error = union_allocvp( | |
358 | ap->a_vpp, | |
825ff80f JSP |
359 | mp, |
360 | NULLVP, | |
01dac67e | 361 | NULLVP, |
12abe7b1 JSP |
362 | ap->a_cnp, |
363 | vp, | |
825ff80f JSP |
364 | NULLVP, |
365 | 1); | |
01dac67e | 366 | if (error) |
e2a2f3a7 | 367 | vput(vp); |
12abe7b1 JSP |
368 | return (error); |
369 | } | |
370 | ||
371 | vput(ap->a_dvp); | |
372 | return (EROFS); | |
373 | } | |
374 | ||
88edbcd4 JSP |
375 | int |
376 | union_whiteout(ap) | |
377 | struct vop_whiteout_args /* { | |
378 | struct vnode *a_dvp; | |
379 | struct componentname *a_cnp; | |
380 | int a_flags; | |
381 | } */ *ap; | |
382 | { | |
383 | struct union_node *un = VTOUNION(ap->a_dvp); | |
384 | ||
385 | if (un->un_uppervp == NULLVP) | |
386 | return (EOPNOTSUPP); | |
387 | ||
388 | FIXUP(un); | |
389 | return (VOP_WHITEOUT(un->un_uppervp, ap->a_cnp, ap->a_flags)); | |
390 | } | |
391 | ||
12abe7b1 JSP |
392 | int |
393 | union_mknod(ap) | |
394 | struct vop_mknod_args /* { | |
395 | struct vnode *a_dvp; | |
396 | struct vnode **a_vpp; | |
397 | struct componentname *a_cnp; | |
398 | struct vattr *a_vap; | |
399 | } */ *ap; | |
400 | { | |
401 | struct union_node *un = VTOUNION(ap->a_dvp); | |
402 | struct vnode *dvp = un->un_uppervp; | |
403 | ||
050766c6 | 404 | if (dvp != NULLVP) { |
12abe7b1 JSP |
405 | int error; |
406 | struct vnode *vp; | |
825ff80f | 407 | struct mount *mp; |
12abe7b1 | 408 | |
c1b204a8 JSP |
409 | FIXUP(un); |
410 | ||
12abe7b1 | 411 | VREF(dvp); |
e2a2f3a7 | 412 | un->un_flags |= UN_KLOCK; |
825ff80f | 413 | mp = ap->a_dvp->v_mount; |
12abe7b1 JSP |
414 | vput(ap->a_dvp); |
415 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
416 | if (error) | |
417 | return (error); | |
418 | ||
050766c6 | 419 | if (vp != NULLVP) { |
01dac67e JSP |
420 | error = union_allocvp( |
421 | ap->a_vpp, | |
825ff80f JSP |
422 | mp, |
423 | NULLVP, | |
01dac67e JSP |
424 | NULLVP, |
425 | ap->a_cnp, | |
426 | vp, | |
825ff80f JSP |
427 | NULLVP, |
428 | 1); | |
01dac67e | 429 | if (error) |
e2a2f3a7 | 430 | vput(vp); |
01dac67e | 431 | } |
12abe7b1 JSP |
432 | return (error); |
433 | } | |
434 | ||
435 | vput(ap->a_dvp); | |
436 | return (EROFS); | |
437 | } | |
438 | ||
a1fa407d JSP |
439 | int |
440 | union_open(ap) | |
441 | struct vop_open_args /* { | |
442 | struct vnodeop_desc *a_desc; | |
443 | struct vnode *a_vp; | |
444 | int a_mode; | |
445 | struct ucred *a_cred; | |
446 | struct proc *a_p; | |
447 | } */ *ap; | |
448 | { | |
449 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 450 | struct vnode *tvp; |
a1fa407d JSP |
451 | int mode = ap->a_mode; |
452 | struct ucred *cred = ap->a_cred; | |
453 | struct proc *p = ap->a_p; | |
01dac67e | 454 | int error; |
a1fa407d JSP |
455 | |
456 | /* | |
457 | * If there is an existing upper vp then simply open that. | |
458 | */ | |
01dac67e JSP |
459 | tvp = un->un_uppervp; |
460 | if (tvp == NULLVP) { | |
a1fa407d | 461 | /* |
01dac67e JSP |
462 | * If the lower vnode is being opened for writing, then |
463 | * copy the file contents to the upper vnode and open that, | |
464 | * otherwise can simply open the lower vnode. | |
a1fa407d | 465 | */ |
01dac67e JSP |
466 | tvp = un->un_lowervp; |
467 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
6f40eb24 | 468 | error = union_copyup(un, (mode&O_TRUNC) == 0, cred, p); |
01dac67e JSP |
469 | if (error == 0) |
470 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
01dac67e | 471 | return (error); |
a1fa407d | 472 | } |
e2a2f3a7 JSP |
473 | |
474 | /* | |
475 | * Just open the lower vnode | |
476 | */ | |
ed5969c8 | 477 | un->un_openl++; |
e2a2f3a7 JSP |
478 | VOP_LOCK(tvp); |
479 | error = VOP_OPEN(tvp, mode, cred, p); | |
480 | VOP_UNLOCK(tvp); | |
481 | ||
482 | return (error); | |
a1fa407d JSP |
483 | } |
484 | ||
c1b204a8 JSP |
485 | FIXUP(un); |
486 | ||
01dac67e | 487 | error = VOP_OPEN(tvp, mode, cred, p); |
01dac67e JSP |
488 | |
489 | return (error); | |
a1fa407d JSP |
490 | } |
491 | ||
12abe7b1 JSP |
492 | int |
493 | union_close(ap) | |
494 | struct vop_close_args /* { | |
495 | struct vnode *a_vp; | |
496 | int a_fflag; | |
497 | struct ucred *a_cred; | |
498 | struct proc *a_p; | |
499 | } */ *ap; | |
500 | { | |
3b293975 JSP |
501 | struct union_node *un = VTOUNION(ap->a_vp); |
502 | struct vnode *vp; | |
12abe7b1 | 503 | |
050766c6 | 504 | if (un->un_uppervp != NULLVP) { |
3b293975 JSP |
505 | vp = un->un_uppervp; |
506 | } else { | |
ed5969c8 JSP |
507 | #ifdef UNION_DIAGNOSTIC |
508 | if (un->un_openl <= 0) | |
509 | panic("union: un_openl cnt"); | |
3b293975 | 510 | #endif |
ed5969c8 | 511 | --un->un_openl; |
3b293975 JSP |
512 | vp = un->un_lowervp; |
513 | } | |
ed5969c8 | 514 | |
3b293975 | 515 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
516 | } |
517 | ||
518 | /* | |
519 | * Check access permission on the union vnode. | |
520 | * The access check being enforced is to check | |
521 | * against both the underlying vnode, and any | |
522 | * copied vnode. This ensures that no additional | |
523 | * file permissions are given away simply because | |
524 | * the user caused an implicit file copy. | |
525 | */ | |
526 | int | |
527 | union_access(ap) | |
528 | struct vop_access_args /* { | |
529 | struct vnodeop_desc *a_desc; | |
530 | struct vnode *a_vp; | |
531 | int a_mode; | |
532 | struct ucred *a_cred; | |
533 | struct proc *a_p; | |
534 | } */ *ap; | |
535 | { | |
536 | struct union_node *un = VTOUNION(ap->a_vp); | |
7315c41f | 537 | int error = EACCES; |
12abe7b1 JSP |
538 | struct vnode *vp; |
539 | ||
050766c6 | 540 | if ((vp = un->un_uppervp) != NULLVP) { |
c1b204a8 JSP |
541 | FIXUP(un); |
542 | return (VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p)); | |
543 | } | |
544 | ||
050766c6 | 545 | if ((vp = un->un_lowervp) != NULLVP) { |
01dac67e | 546 | VOP_LOCK(vp); |
12abe7b1 | 547 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
c1b204a8 JSP |
548 | if (error == 0) { |
549 | struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount); | |
550 | ||
551 | if (um->um_op == UNMNT_BELOW) | |
552 | error = VOP_ACCESS(vp, ap->a_mode, | |
553 | um->um_cred, ap->a_p); | |
554 | } | |
01dac67e | 555 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
556 | if (error) |
557 | return (error); | |
558 | } | |
559 | ||
01dac67e | 560 | return (error); |
12abe7b1 JSP |
561 | } |
562 | ||
a1fa407d | 563 | /* |
8a9c17f6 JSP |
564 | * We handle getattr only to change the fsid and |
565 | * track object sizes | |
a1fa407d JSP |
566 | */ |
567 | int | |
568 | union_getattr(ap) | |
569 | struct vop_getattr_args /* { | |
570 | struct vnode *a_vp; | |
571 | struct vattr *a_vap; | |
572 | struct ucred *a_cred; | |
573 | struct proc *a_p; | |
574 | } */ *ap; | |
575 | { | |
576 | int error; | |
0931f2d9 JSP |
577 | struct union_node *un = VTOUNION(ap->a_vp); |
578 | struct vnode *vp = un->un_uppervp; | |
579 | struct vattr *vap; | |
580 | struct vattr va; | |
581 | ||
582 | ||
583 | /* | |
584 | * Some programs walk the filesystem hierarchy by counting | |
585 | * links to directories to avoid stat'ing all the time. | |
586 | * This means the link count on directories needs to be "correct". | |
587 | * The only way to do that is to call getattr on both layers | |
588 | * and fix up the link count. The link count will not necessarily | |
589 | * be accurate but will be large enough to defeat the tree walkers. | |
590 | */ | |
591 | ||
592 | vap = ap->a_vap; | |
593 | ||
594 | vp = un->un_uppervp; | |
595 | if (vp != NULLVP) { | |
463c0360 JSP |
596 | /* |
597 | * It's not clear whether VOP_GETATTR is to be | |
598 | * called with the vnode locked or not. stat() calls | |
599 | * it with (vp) locked, and fstat calls it with | |
600 | * (vp) unlocked. | |
601 | * In the mean time, compensate here by checking | |
602 | * the union_node's lock flag. | |
603 | */ | |
604 | if (un->un_flags & UN_LOCKED) | |
605 | FIXUP(un); | |
606 | ||
0931f2d9 JSP |
607 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
608 | if (error) | |
609 | return (error); | |
8a9c17f6 | 610 | union_newsize(ap->a_vp, vap->va_size, VNOVAL); |
0931f2d9 | 611 | } |
01dac67e | 612 | |
0931f2d9 JSP |
613 | if (vp == NULLVP) { |
614 | vp = un->un_lowervp; | |
615 | } else if (vp->v_type == VDIR) { | |
616 | vp = un->un_lowervp; | |
617 | vap = &va; | |
618 | } else { | |
619 | vp = NULLVP; | |
620 | } | |
621 | ||
622 | if (vp != NULLVP) { | |
0931f2d9 | 623 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
0931f2d9 JSP |
624 | if (error) |
625 | return (error); | |
8a9c17f6 | 626 | union_newsize(ap->a_vp, VNOVAL, vap->va_size); |
0931f2d9 JSP |
627 | } |
628 | ||
629 | if ((vap != ap->a_vap) && (vap->va_type == VDIR)) | |
630 | ap->a_vap->va_nlink += vap->va_nlink; | |
a1fa407d | 631 | |
8de82e02 | 632 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; |
a1fa407d JSP |
633 | return (0); |
634 | } | |
635 | ||
a1fa407d | 636 | int |
01dac67e | 637 | union_setattr(ap) |
12abe7b1 | 638 | struct vop_setattr_args /* { |
a1fa407d | 639 | struct vnode *a_vp; |
12abe7b1 | 640 | struct vattr *a_vap; |
a1fa407d | 641 | struct ucred *a_cred; |
12abe7b1 | 642 | struct proc *a_p; |
a1fa407d JSP |
643 | } */ *ap; |
644 | { | |
645 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 646 | int error; |
a1fa407d | 647 | |
d596128e JSP |
648 | /* |
649 | * Handle case of truncating lower object to zero size, | |
650 | * by creating a zero length upper object. This is to | |
651 | * handle the case of open with O_TRUNC and O_CREAT. | |
652 | */ | |
653 | if ((un->un_uppervp == NULLVP) && | |
654 | /* assert(un->un_lowervp != NULLVP) */ | |
88edbcd4 JSP |
655 | (un->un_lowervp->v_type == VREG)) { |
656 | error = union_copyup(un, (ap->a_vap->va_size != 0), | |
657 | ap->a_cred, ap->a_p); | |
d596128e JSP |
658 | if (error) |
659 | return (error); | |
d596128e JSP |
660 | } |
661 | ||
662 | /* | |
663 | * Try to set attributes in upper layer, | |
664 | * otherwise return read-only filesystem error. | |
665 | */ | |
666 | if (un->un_uppervp != NULLVP) { | |
c1b204a8 | 667 | FIXUP(un); |
12abe7b1 JSP |
668 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, |
669 | ap->a_cred, ap->a_p); | |
8a9c17f6 JSP |
670 | if ((error == 0) && (ap->a_vap->va_size != VNOVAL)) |
671 | union_newsize(ap->a_vp, ap->a_vap->va_size, VNOVAL); | |
12abe7b1 | 672 | } else { |
12abe7b1 JSP |
673 | error = EROFS; |
674 | } | |
a1fa407d | 675 | |
12abe7b1 | 676 | return (error); |
a1fa407d JSP |
677 | } |
678 | ||
679 | int | |
12abe7b1 JSP |
680 | union_read(ap) |
681 | struct vop_read_args /* { | |
a1fa407d | 682 | struct vnode *a_vp; |
12abe7b1 JSP |
683 | struct uio *a_uio; |
684 | int a_ioflag; | |
685 | struct ucred *a_cred; | |
a1fa407d JSP |
686 | } */ *ap; |
687 | { | |
12abe7b1 JSP |
688 | int error; |
689 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 690 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 691 | |
e2a2f3a7 JSP |
692 | if (dolock) |
693 | VOP_LOCK(vp); | |
c1b204a8 JSP |
694 | else |
695 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 696 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
697 | if (dolock) |
698 | VOP_UNLOCK(vp); | |
12abe7b1 | 699 | |
8a9c17f6 JSP |
700 | /* |
701 | * XXX | |
702 | * perhaps the size of the underlying object has changed under | |
703 | * our feet. take advantage of the offset information present | |
704 | * in the uio structure. | |
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 | 719 | return (error); |
a1fa407d JSP |
720 | } |
721 | ||
722 | int | |
12abe7b1 JSP |
723 | union_write(ap) |
724 | struct vop_read_args /* { | |
a1fa407d | 725 | struct vnode *a_vp; |
12abe7b1 JSP |
726 | struct uio *a_uio; |
727 | int a_ioflag; | |
728 | struct ucred *a_cred; | |
a1fa407d JSP |
729 | } */ *ap; |
730 | { | |
12abe7b1 | 731 | int error; |
88edbcd4 JSP |
732 | struct vnode *vp; |
733 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 734 | |
88edbcd4 JSP |
735 | vp = UPPERVP(ap->a_vp); |
736 | if (vp == NULLVP) | |
737 | panic("union: missing upper layer in write"); | |
738 | ||
739 | FIXUP(un); | |
12abe7b1 | 740 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
a1fa407d | 741 | |
8a9c17f6 JSP |
742 | /* |
743 | * the size of the underlying object may be changed by the | |
744 | * write. | |
745 | */ | |
746 | if (error == 0) { | |
8a9c17f6 JSP |
747 | off_t cur = ap->a_uio->uio_offset; |
748 | ||
88edbcd4 JSP |
749 | if (cur > un->un_uppersz) |
750 | union_newsize(ap->a_vp, cur, VNOVAL); | |
8a9c17f6 JSP |
751 | } |
752 | ||
12abe7b1 JSP |
753 | return (error); |
754 | } | |
a1fa407d | 755 | |
e77dc0c1 JSP |
756 | union_lease(ap) |
757 | struct vop_lease_args /* { | |
758 | struct vnode *a_vp; | |
759 | struct proc *a_p; | |
760 | struct ucred *a_cred; | |
761 | int a_flag; | |
762 | } */ *ap; | |
763 | { | |
764 | ||
765 | return (VOP_LEASE(OTHERVP(ap->a_vp), ap->a_p, ap->a_cred, ap->a_flag)); | |
766 | } | |
767 | ||
a1fa407d | 768 | int |
12abe7b1 JSP |
769 | union_ioctl(ap) |
770 | struct vop_ioctl_args /* { | |
a1fa407d | 771 | struct vnode *a_vp; |
12abe7b1 JSP |
772 | int a_command; |
773 | caddr_t a_data; | |
774 | int a_fflag; | |
775 | struct ucred *a_cred; | |
776 | struct proc *a_p; | |
a1fa407d JSP |
777 | } */ *ap; |
778 | { | |
a1fa407d | 779 | |
12abe7b1 JSP |
780 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
781 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
782 | } |
783 | ||
a1fa407d | 784 | int |
12abe7b1 JSP |
785 | union_select(ap) |
786 | struct vop_select_args /* { | |
787 | struct vnode *a_vp; | |
788 | int a_which; | |
789 | int a_fflags; | |
790 | struct ucred *a_cred; | |
791 | struct proc *a_p; | |
792 | } */ *ap; | |
793 | { | |
794 | ||
795 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
796 | ap->a_cred, ap->a_p)); | |
797 | } | |
798 | ||
799 | int | |
800 | union_mmap(ap) | |
801 | struct vop_mmap_args /* { | |
802 | struct vnode *a_vp; | |
803 | int a_fflags; | |
804 | struct ucred *a_cred; | |
805 | struct proc *a_p; | |
806 | } */ *ap; | |
807 | { | |
808 | ||
809 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
810 | ap->a_cred, ap->a_p)); | |
811 | } | |
812 | ||
813 | int | |
814 | union_fsync(ap) | |
815 | struct vop_fsync_args /* { | |
816 | struct vnode *a_vp; | |
817 | struct ucred *a_cred; | |
818 | int a_waitfor; | |
819 | struct proc *a_p; | |
820 | } */ *ap; | |
821 | { | |
822 | int error = 0; | |
823 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
824 | ||
050766c6 | 825 | if (targetvp != NULLVP) { |
e2a2f3a7 JSP |
826 | int dolock = (targetvp == LOWERVP(ap->a_vp)); |
827 | ||
828 | if (dolock) | |
829 | VOP_LOCK(targetvp); | |
c1b204a8 JSP |
830 | else |
831 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 JSP |
832 | error = VOP_FSYNC(targetvp, ap->a_cred, |
833 | ap->a_waitfor, ap->a_p); | |
e2a2f3a7 JSP |
834 | if (dolock) |
835 | VOP_UNLOCK(targetvp); | |
12abe7b1 JSP |
836 | } |
837 | ||
838 | return (error); | |
839 | } | |
840 | ||
841 | int | |
842 | union_seek(ap) | |
843 | struct vop_seek_args /* { | |
844 | struct vnode *a_vp; | |
845 | off_t a_oldoff; | |
846 | off_t a_newoff; | |
847 | struct ucred *a_cred; | |
848 | } */ *ap; | |
849 | { | |
850 | ||
851 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
852 | } | |
853 | ||
854 | int | |
855 | union_remove(ap) | |
856 | struct vop_remove_args /* { | |
857 | struct vnode *a_dvp; | |
858 | struct vnode *a_vp; | |
859 | struct componentname *a_cnp; | |
a1fa407d JSP |
860 | } */ *ap; |
861 | { | |
a1fa407d | 862 | int error; |
12abe7b1 JSP |
863 | struct union_node *dun = VTOUNION(ap->a_dvp); |
864 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 865 | |
88edbcd4 JSP |
866 | if (dun->un_uppervp == NULLVP) |
867 | panic("union remove: null upper vnode"); | |
868 | ||
869 | if (un->un_uppervp != NULLVP) { | |
12abe7b1 JSP |
870 | struct vnode *dvp = dun->un_uppervp; |
871 | struct vnode *vp = un->un_uppervp; | |
feef08bc | 872 | struct componentname *cnp = ap->a_cnp; |
a1fa407d | 873 | |
c1b204a8 | 874 | FIXUP(dun); |
12abe7b1 | 875 | VREF(dvp); |
e2a2f3a7 | 876 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 877 | vput(ap->a_dvp); |
c1b204a8 | 878 | FIXUP(un); |
12abe7b1 | 879 | VREF(vp); |
e2a2f3a7 | 880 | un->un_flags |= UN_KLOCK; |
12abe7b1 | 881 | vput(ap->a_vp); |
a1fa407d | 882 | |
feef08bc JSP |
883 | if (union_dowhiteout(un, cnp->cn_cred, cnp->cn_proc)) |
884 | cnp->cn_flags |= DOWHITEOUT; | |
885 | error = VOP_REMOVE(dvp, vp, cnp); | |
ed5969c8 JSP |
886 | if (!error) |
887 | union_removed_upper(un); | |
12abe7b1 | 888 | } else { |
88edbcd4 JSP |
889 | FIXUP(dun); |
890 | error = union_mkwhiteout( | |
891 | MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), | |
892 | dun->un_uppervp, ap->a_cnp, un->un_path); | |
12abe7b1 JSP |
893 | vput(ap->a_dvp); |
894 | vput(ap->a_vp); | |
12abe7b1 JSP |
895 | } |
896 | ||
897 | return (error); | |
898 | } | |
899 | ||
900 | int | |
901 | union_link(ap) | |
902 | struct vop_link_args /* { | |
903 | struct vnode *a_vp; | |
904 | struct vnode *a_tdvp; | |
905 | struct componentname *a_cnp; | |
906 | } */ *ap; | |
907 | { | |
6f40eb24 JSP |
908 | int error = 0; |
909 | struct union_node *un; | |
910 | struct vnode *vp; | |
911 | struct vnode *tdvp; | |
12abe7b1 | 912 | |
1479a47a | 913 | un = VTOUNION(ap->a_tdvp); |
12abe7b1 | 914 | |
1479a47a KM |
915 | if (ap->a_tdvp->v_op != ap->a_vp->v_op) { |
916 | vp = ap->a_vp; | |
12abe7b1 | 917 | } else { |
1479a47a KM |
918 | struct union_node *tun = VTOUNION(ap->a_vp); |
919 | if (tun->un_uppervp == NULLVP) { | |
920 | VOP_LOCK(ap->a_vp); | |
921 | if (un->un_uppervp == tun->un_dirvp) { | |
6f40eb24 JSP |
922 | un->un_flags &= ~UN_ULOCK; |
923 | VOP_UNLOCK(un->un_uppervp); | |
924 | } | |
1479a47a | 925 | error = union_copyup(tun, 1, ap->a_cnp->cn_cred, |
6f40eb24 | 926 | ap->a_cnp->cn_proc); |
1479a47a | 927 | if (un->un_uppervp == tun->un_dirvp) { |
6f40eb24 JSP |
928 | VOP_LOCK(un->un_uppervp); |
929 | un->un_flags |= UN_ULOCK; | |
930 | } | |
1479a47a | 931 | VOP_UNLOCK(ap->a_vp); |
6f40eb24 | 932 | } |
1479a47a | 933 | vp = tun->un_uppervp; |
6f40eb24 JSP |
934 | } |
935 | ||
1479a47a KM |
936 | tdvp = un->un_uppervp; |
937 | if (tdvp == NULLVP) | |
12abe7b1 | 938 | error = EROFS; |
6f40eb24 JSP |
939 | |
940 | if (error) { | |
1479a47a | 941 | vput(ap->a_tdvp); |
6f40eb24 | 942 | return (error); |
12abe7b1 | 943 | } |
a1fa407d | 944 | |
6f40eb24 | 945 | FIXUP(un); |
1479a47a | 946 | VREF(tdvp); |
6f40eb24 | 947 | un->un_flags |= UN_KLOCK; |
1479a47a | 948 | vput(ap->a_tdvp); |
6f40eb24 JSP |
949 | |
950 | return (VOP_LINK(vp, tdvp, ap->a_cnp)); | |
a1fa407d JSP |
951 | } |
952 | ||
12abe7b1 JSP |
953 | int |
954 | union_rename(ap) | |
955 | struct vop_rename_args /* { | |
956 | struct vnode *a_fdvp; | |
957 | struct vnode *a_fvp; | |
958 | struct componentname *a_fcnp; | |
959 | struct vnode *a_tdvp; | |
960 | struct vnode *a_tvp; | |
961 | struct componentname *a_tcnp; | |
962 | } */ *ap; | |
963 | { | |
964 | int error; | |
965 | ||
966 | struct vnode *fdvp = ap->a_fdvp; | |
967 | struct vnode *fvp = ap->a_fvp; | |
968 | struct vnode *tdvp = ap->a_tdvp; | |
969 | struct vnode *tvp = ap->a_tvp; | |
970 | ||
971 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
972 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 973 | if (un->un_uppervp == NULLVP) { |
88edbcd4 JSP |
974 | /* |
975 | * this should never happen in normal | |
976 | * operation but might if there was | |
977 | * a problem creating the top-level shadow | |
978 | * directory. | |
979 | */ | |
980 | error = EXDEV; | |
12abe7b1 JSP |
981 | goto bad; |
982 | } | |
983 | ||
984 | fdvp = un->un_uppervp; | |
985 | VREF(fdvp); | |
986 | vrele(ap->a_fdvp); | |
987 | } | |
988 | ||
989 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
990 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 991 | if (un->un_uppervp == NULLVP) { |
88edbcd4 JSP |
992 | /* XXX: should do a copyup */ |
993 | error = EXDEV; | |
12abe7b1 JSP |
994 | goto bad; |
995 | } | |
996 | ||
88edbcd4 JSP |
997 | if (un->un_lowervp != NULLVP) |
998 | ap->a_fcnp->cn_flags |= DOWHITEOUT; | |
999 | ||
12abe7b1 JSP |
1000 | fvp = un->un_uppervp; |
1001 | VREF(fvp); | |
1002 | vrele(ap->a_fvp); | |
1003 | } | |
1004 | ||
1005 | if (tdvp->v_op == union_vnodeop_p) { | |
1006 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 1007 | if (un->un_uppervp == NULLVP) { |
050766c6 JSP |
1008 | /* |
1009 | * this should never happen in normal | |
1010 | * operation but might if there was | |
1011 | * a problem creating the top-level shadow | |
1012 | * directory. | |
1013 | */ | |
88edbcd4 | 1014 | error = EXDEV; |
12abe7b1 JSP |
1015 | goto bad; |
1016 | } | |
1017 | ||
1018 | tdvp = un->un_uppervp; | |
1019 | VREF(tdvp); | |
e2a2f3a7 | 1020 | un->un_flags |= UN_KLOCK; |
3b293975 | 1021 | vput(ap->a_tdvp); |
12abe7b1 JSP |
1022 | } |
1023 | ||
050766c6 | 1024 | if (tvp != NULLVP && tvp->v_op == union_vnodeop_p) { |
12abe7b1 | 1025 | struct union_node *un = VTOUNION(tvp); |
12abe7b1 JSP |
1026 | |
1027 | tvp = un->un_uppervp; | |
050766c6 JSP |
1028 | if (tvp != NULLVP) { |
1029 | VREF(tvp); | |
1030 | un->un_flags |= UN_KLOCK; | |
1031 | } | |
12abe7b1 JSP |
1032 | vput(ap->a_tvp); |
1033 | } | |
1034 | ||
1035 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
1036 | ||
1037 | bad: | |
1038 | vrele(fdvp); | |
1039 | vrele(fvp); | |
1040 | vput(tdvp); | |
050766c6 | 1041 | if (tvp != NULLVP) |
12abe7b1 JSP |
1042 | vput(tvp); |
1043 | ||
1044 | return (error); | |
1045 | } | |
1046 | ||
1047 | int | |
1048 | union_mkdir(ap) | |
1049 | struct vop_mkdir_args /* { | |
1050 | struct vnode *a_dvp; | |
1051 | struct vnode **a_vpp; | |
1052 | struct componentname *a_cnp; | |
1053 | struct vattr *a_vap; | |
1054 | } */ *ap; | |
1055 | { | |
1056 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1057 | struct vnode *dvp = un->un_uppervp; | |
1058 | ||
050766c6 | 1059 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1060 | int error; |
1061 | struct vnode *vp; | |
12abe7b1 | 1062 | |
c1b204a8 | 1063 | FIXUP(un); |
12abe7b1 | 1064 | VREF(dvp); |
e2a2f3a7 | 1065 | un->un_flags |= UN_KLOCK; |
825ff80f | 1066 | VOP_UNLOCK(ap->a_dvp); |
12abe7b1 | 1067 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); |
825ff80f JSP |
1068 | if (error) { |
1069 | vrele(ap->a_dvp); | |
12abe7b1 | 1070 | return (error); |
825ff80f | 1071 | } |
12abe7b1 JSP |
1072 | |
1073 | error = union_allocvp( | |
1074 | ap->a_vpp, | |
79f80c71 JSP |
1075 | ap->a_dvp->v_mount, |
1076 | ap->a_dvp, | |
01dac67e | 1077 | NULLVP, |
12abe7b1 JSP |
1078 | ap->a_cnp, |
1079 | vp, | |
825ff80f JSP |
1080 | NULLVP, |
1081 | 1); | |
1082 | vrele(ap->a_dvp); | |
01dac67e | 1083 | if (error) |
e2a2f3a7 | 1084 | vput(vp); |
12abe7b1 JSP |
1085 | return (error); |
1086 | } | |
1087 | ||
1088 | vput(ap->a_dvp); | |
1089 | return (EROFS); | |
1090 | } | |
1091 | ||
1092 | int | |
1093 | union_rmdir(ap) | |
1094 | struct vop_rmdir_args /* { | |
1095 | struct vnode *a_dvp; | |
1096 | struct vnode *a_vp; | |
1097 | struct componentname *a_cnp; | |
1098 | } */ *ap; | |
1099 | { | |
1100 | int error; | |
1101 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
1102 | struct union_node *un = VTOUNION(ap->a_vp); | |
1103 | ||
88edbcd4 JSP |
1104 | if (dun->un_uppervp == NULLVP) |
1105 | panic("union rmdir: null upper vnode"); | |
1106 | ||
1107 | if (un->un_uppervp != NULLVP) { | |
12abe7b1 JSP |
1108 | struct vnode *dvp = dun->un_uppervp; |
1109 | struct vnode *vp = un->un_uppervp; | |
feef08bc | 1110 | struct componentname *cnp = ap->a_cnp; |
12abe7b1 | 1111 | |
c1b204a8 | 1112 | FIXUP(dun); |
12abe7b1 | 1113 | VREF(dvp); |
e2a2f3a7 | 1114 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 1115 | vput(ap->a_dvp); |
c1b204a8 | 1116 | FIXUP(un); |
12abe7b1 | 1117 | VREF(vp); |
e2a2f3a7 | 1118 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1119 | vput(ap->a_vp); |
1120 | ||
feef08bc JSP |
1121 | if (union_dowhiteout(un, cnp->cn_cred, cnp->cn_proc)) |
1122 | cnp->cn_flags |= DOWHITEOUT; | |
e2a2f3a7 | 1123 | error = VOP_RMDIR(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
1124 | if (!error) |
1125 | union_removed_upper(un); | |
12abe7b1 | 1126 | } else { |
88edbcd4 JSP |
1127 | FIXUP(dun); |
1128 | error = union_mkwhiteout( | |
1129 | MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), | |
1130 | dun->un_uppervp, ap->a_cnp, un->un_path); | |
12abe7b1 JSP |
1131 | vput(ap->a_dvp); |
1132 | vput(ap->a_vp); | |
12abe7b1 JSP |
1133 | } |
1134 | ||
1135 | return (error); | |
1136 | } | |
1137 | ||
1138 | int | |
1139 | union_symlink(ap) | |
1140 | struct vop_symlink_args /* { | |
1141 | struct vnode *a_dvp; | |
1142 | struct vnode **a_vpp; | |
1143 | struct componentname *a_cnp; | |
1144 | struct vattr *a_vap; | |
1145 | char *a_target; | |
1146 | } */ *ap; | |
1147 | { | |
1148 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1149 | struct vnode *dvp = un->un_uppervp; | |
1150 | ||
050766c6 | 1151 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1152 | int error; |
1153 | struct vnode *vp; | |
1154 | struct mount *mp = ap->a_dvp->v_mount; | |
1155 | ||
c1b204a8 | 1156 | FIXUP(un); |
12abe7b1 | 1157 | VREF(dvp); |
e2a2f3a7 | 1158 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1159 | vput(ap->a_dvp); |
1160 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
1161 | ap->a_vap, ap->a_target); | |
3b293975 | 1162 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
1163 | return (error); |
1164 | } | |
1165 | ||
1166 | vput(ap->a_dvp); | |
1167 | return (EROFS); | |
1168 | } | |
a1fa407d JSP |
1169 | |
1170 | /* | |
12abe7b1 JSP |
1171 | * union_readdir works in concert with getdirentries and |
1172 | * readdir(3) to provide a list of entries in the unioned | |
1173 | * directories. getdirentries is responsible for walking | |
1174 | * down the union stack. readdir(3) is responsible for | |
1175 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
1176 | */ |
1177 | int | |
12abe7b1 JSP |
1178 | union_readdir(ap) |
1179 | struct vop_readdir_args /* { | |
1180 | struct vnodeop_desc *a_desc; | |
1181 | struct vnode *a_vp; | |
1182 | struct uio *a_uio; | |
1183 | struct ucred *a_cred; | |
94b29fae KM |
1184 | int *a_eofflag; |
1185 | u_long *a_cookies; | |
1186 | int a_ncookies; | |
12abe7b1 JSP |
1187 | } */ *ap; |
1188 | { | |
94b29fae KM |
1189 | register struct union_node *un = VTOUNION(ap->a_vp); |
1190 | register struct vnode *uvp = un->un_uppervp; | |
12abe7b1 | 1191 | |
94b29fae KM |
1192 | if (uvp == NULLVP) |
1193 | return (0); | |
12abe7b1 | 1194 | |
94b29fae KM |
1195 | FIXUP(un); |
1196 | ap->a_vp = uvp; | |
1197 | return (VOCALL(uvp->v_op, VOFFSET(vop_readdir), ap)); | |
12abe7b1 JSP |
1198 | } |
1199 | ||
1200 | int | |
1201 | union_readlink(ap) | |
1202 | struct vop_readlink_args /* { | |
1203 | struct vnode *a_vp; | |
1204 | struct uio *a_uio; | |
1205 | struct ucred *a_cred; | |
a1fa407d JSP |
1206 | } */ *ap; |
1207 | { | |
a1fa407d | 1208 | int error; |
12abe7b1 | 1209 | struct vnode *vp = OTHERVP(ap->a_vp); |
e2a2f3a7 | 1210 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 1211 | |
e2a2f3a7 JSP |
1212 | if (dolock) |
1213 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1214 | else |
1215 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1216 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); |
e2a2f3a7 JSP |
1217 | if (dolock) |
1218 | VOP_UNLOCK(vp); | |
a1fa407d | 1219 | |
12abe7b1 JSP |
1220 | return (error); |
1221 | } | |
a1fa407d | 1222 | |
12abe7b1 JSP |
1223 | int |
1224 | union_abortop(ap) | |
1225 | struct vop_abortop_args /* { | |
1226 | struct vnode *a_dvp; | |
1227 | struct componentname *a_cnp; | |
1228 | } */ *ap; | |
1229 | { | |
1230 | int error; | |
01dac67e | 1231 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1232 | struct union_node *un = VTOUNION(ap->a_dvp); |
1233 | int islocked = un->un_flags & UN_LOCKED; | |
e2a2f3a7 | 1234 | int dolock = (vp == LOWERVP(ap->a_dvp)); |
a1fa407d | 1235 | |
c1b204a8 JSP |
1236 | if (islocked) { |
1237 | if (dolock) | |
1238 | VOP_LOCK(vp); | |
1239 | else | |
1240 | FIXUP(VTOUNION(ap->a_dvp)); | |
1241 | } | |
12abe7b1 | 1242 | error = VOP_ABORTOP(vp, ap->a_cnp); |
e2a2f3a7 | 1243 | if (islocked && dolock) |
12abe7b1 | 1244 | VOP_UNLOCK(vp); |
a1fa407d JSP |
1245 | |
1246 | return (error); | |
1247 | } | |
1248 | ||
12abe7b1 JSP |
1249 | int |
1250 | union_inactive(ap) | |
1251 | struct vop_inactive_args /* { | |
1252 | struct vnode *a_vp; | |
1253 | } */ *ap; | |
1254 | { | |
463c0360 | 1255 | struct union_node *un = VTOUNION(ap->a_vp); |
825ff80f | 1256 | struct vnode **vpp; |
12abe7b1 JSP |
1257 | |
1258 | /* | |
1259 | * Do nothing (and _don't_ bypass). | |
1260 | * Wait to vrele lowervp until reclaim, | |
1261 | * so that until then our union_node is in the | |
1262 | * cache and reusable. | |
1263 | * | |
1264 | * NEEDSWORK: Someday, consider inactive'ing | |
1265 | * the lowervp and then trying to reactivate it | |
1266 | * with capabilities (v_id) | |
1267 | * like they do in the name lookup cache code. | |
1268 | * That's too much work for now. | |
1269 | */ | |
79f80c71 | 1270 | |
ed5969c8 | 1271 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1272 | if (un->un_flags & UN_LOCKED) |
1273 | panic("union: inactivating locked node"); | |
463c0360 JSP |
1274 | if (un->un_flags & UN_ULOCK) |
1275 | panic("union: inactivating w/locked upper node"); | |
79f80c71 JSP |
1276 | #endif |
1277 | ||
825ff80f JSP |
1278 | if (un->un_dircache != 0) { |
1279 | for (vpp = un->un_dircache; *vpp != NULLVP; vpp++) | |
1280 | vrele(*vpp); | |
1281 | free(un->un_dircache, M_TEMP); | |
1282 | un->un_dircache = 0; | |
1283 | } | |
1284 | ||
463c0360 | 1285 | if ((un->un_flags & UN_CACHED) == 0) |
91e07565 | 1286 | VOP_REVOKE(ap->a_vp, 0); |
463c0360 | 1287 | |
12abe7b1 JSP |
1288 | return (0); |
1289 | } | |
1290 | ||
1291 | int | |
1292 | union_reclaim(ap) | |
1293 | struct vop_reclaim_args /* { | |
1294 | struct vnode *a_vp; | |
1295 | } */ *ap; | |
1296 | { | |
12abe7b1 | 1297 | |
58572fc0 JSP |
1298 | union_freevp(ap->a_vp); |
1299 | ||
12abe7b1 JSP |
1300 | return (0); |
1301 | } | |
1302 | ||
a1fa407d JSP |
1303 | int |
1304 | union_lock(ap) | |
1305 | struct vop_lock_args *ap; | |
1306 | { | |
7315c41f JSP |
1307 | struct vnode *vp = ap->a_vp; |
1308 | struct union_node *un; | |
1309 | ||
1310 | start: | |
1311 | while (vp->v_flag & VXLOCK) { | |
1312 | vp->v_flag |= VXWANT; | |
1313 | sleep((caddr_t)vp, PINOD); | |
1314 | } | |
1315 | ||
1316 | un = VTOUNION(vp); | |
a1fa407d | 1317 | |
050766c6 | 1318 | if (un->un_uppervp != NULLVP) { |
2e2839fc JSP |
1319 | if (((un->un_flags & UN_ULOCK) == 0) && |
1320 | (vp->v_usecount != 0)) { | |
e2a2f3a7 | 1321 | un->un_flags |= UN_ULOCK; |
7315c41f | 1322 | VOP_LOCK(un->un_uppervp); |
e2a2f3a7 JSP |
1323 | } |
1324 | #ifdef DIAGNOSTIC | |
1325 | if (un->un_flags & UN_KLOCK) | |
1326 | panic("union: dangling upper lock"); | |
1327 | #endif | |
1328 | } | |
1329 | ||
7315c41f | 1330 | if (un->un_flags & UN_LOCKED) { |
a1fa407d | 1331 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1332 | if (curproc && un->un_pid == curproc->p_pid && |
1333 | un->un_pid > -1 && curproc->p_pid > -1) | |
1334 | panic("union: locking against myself"); | |
a1fa407d | 1335 | #endif |
a1fa407d JSP |
1336 | un->un_flags |= UN_WANT; |
1337 | sleep((caddr_t) &un->un_flags, PINOD); | |
7315c41f | 1338 | goto start; |
a1fa407d | 1339 | } |
79f80c71 | 1340 | |
a1fa407d | 1341 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1342 | if (curproc) |
1343 | un->un_pid = curproc->p_pid; | |
1344 | else | |
1345 | un->un_pid = -1; | |
a1fa407d | 1346 | #endif |
15a86f7e | 1347 | |
7315c41f | 1348 | un->un_flags |= UN_LOCKED; |
15a86f7e | 1349 | return (0); |
a1fa407d JSP |
1350 | } |
1351 | ||
1352 | int | |
1353 | union_unlock(ap) | |
1354 | struct vop_lock_args *ap; | |
1355 | { | |
1356 | struct union_node *un = VTOUNION(ap->a_vp); | |
1357 | ||
1358 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1359 | if ((un->un_flags & UN_LOCKED) == 0) |
1360 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1361 | if (curproc && un->un_pid != curproc->p_pid && |
1362 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1363 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1364 | #endif |
1365 | ||
a1fa407d | 1366 | un->un_flags &= ~UN_LOCKED; |
e2a2f3a7 JSP |
1367 | |
1368 | if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK) | |
1369 | VOP_UNLOCK(un->un_uppervp); | |
1370 | ||
1371 | un->un_flags &= ~(UN_ULOCK|UN_KLOCK); | |
1372 | ||
a1fa407d JSP |
1373 | if (un->un_flags & UN_WANT) { |
1374 | un->un_flags &= ~UN_WANT; | |
1375 | wakeup((caddr_t) &un->un_flags); | |
1376 | } | |
1377 | ||
1378 | #ifdef DIAGNOSTIC | |
1379 | un->un_pid = 0; | |
1380 | #endif | |
15a86f7e JSP |
1381 | |
1382 | return (0); | |
a1fa407d JSP |
1383 | } |
1384 | ||
12abe7b1 JSP |
1385 | int |
1386 | union_bmap(ap) | |
1387 | struct vop_bmap_args /* { | |
1388 | struct vnode *a_vp; | |
1389 | daddr_t a_bn; | |
1390 | struct vnode **a_vpp; | |
1391 | daddr_t *a_bnp; | |
1392 | int *a_runp; | |
1393 | } */ *ap; | |
1394 | { | |
1395 | int error; | |
1396 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1397 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1398 | |
e2a2f3a7 JSP |
1399 | if (dolock) |
1400 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1401 | else |
1402 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1403 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); |
e2a2f3a7 JSP |
1404 | if (dolock) |
1405 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1406 | |
1407 | return (error); | |
1408 | } | |
1409 | ||
1410 | int | |
1411 | union_print(ap) | |
1412 | struct vop_print_args /* { | |
1413 | struct vnode *a_vp; | |
1414 | } */ *ap; | |
1415 | { | |
1416 | struct vnode *vp = ap->a_vp; | |
1417 | ||
1418 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1419 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1420 | return (0); | |
1421 | } | |
1422 | ||
1423 | int | |
1424 | union_islocked(ap) | |
1425 | struct vop_islocked_args /* { | |
1426 | struct vnode *a_vp; | |
1427 | } */ *ap; | |
1428 | { | |
1429 | ||
1430 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1431 | } | |
1432 | ||
1433 | int | |
1434 | union_pathconf(ap) | |
1435 | struct vop_pathconf_args /* { | |
1436 | struct vnode *a_vp; | |
1437 | int a_name; | |
1438 | int *a_retval; | |
1439 | } */ *ap; | |
1440 | { | |
1441 | int error; | |
1442 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1443 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1444 | |
e2a2f3a7 JSP |
1445 | if (dolock) |
1446 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1447 | else |
1448 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1449 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); |
e2a2f3a7 JSP |
1450 | if (dolock) |
1451 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1452 | |
1453 | return (error); | |
1454 | } | |
1455 | ||
1456 | int | |
1457 | union_advlock(ap) | |
1458 | struct vop_advlock_args /* { | |
1459 | struct vnode *a_vp; | |
1460 | caddr_t a_id; | |
1461 | int a_op; | |
1462 | struct flock *a_fl; | |
1463 | int a_flags; | |
1464 | } */ *ap; | |
1465 | { | |
1466 | ||
1467 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1468 | ap->a_fl, ap->a_flags)); | |
1469 | } | |
1470 | ||
1471 | ||
a1fa407d | 1472 | /* |
12abe7b1 JSP |
1473 | * XXX - vop_strategy must be hand coded because it has no |
1474 | * vnode in its arguments. | |
1475 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1476 | */ |
12abe7b1 JSP |
1477 | int |
1478 | union_strategy(ap) | |
1479 | struct vop_strategy_args /* { | |
1480 | struct buf *a_bp; | |
1481 | } */ *ap; | |
1482 | { | |
1483 | struct buf *bp = ap->a_bp; | |
1484 | int error; | |
1485 | struct vnode *savedvp; | |
1486 | ||
1487 | savedvp = bp->b_vp; | |
1488 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1489 | |
12abe7b1 | 1490 | #ifdef DIAGNOSTIC |
3b293975 | 1491 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1492 | panic("union_strategy: nil vp"); |
1493 | if (((bp->b_flags & B_READ) == 0) && | |
1494 | (bp->b_vp == LOWERVP(savedvp))) | |
1495 | panic("union_strategy: writing to lowervp"); | |
1496 | #endif | |
a1fa407d | 1497 | |
12abe7b1 JSP |
1498 | error = VOP_STRATEGY(bp); |
1499 | bp->b_vp = savedvp; | |
a1fa407d | 1500 | |
12abe7b1 JSP |
1501 | return (error); |
1502 | } | |
a1fa407d | 1503 | |
12abe7b1 JSP |
1504 | /* |
1505 | * Global vfs data structures | |
1506 | */ | |
1507 | int (**union_vnodeop_p)(); | |
01dac67e | 1508 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1509 | { &vop_default_desc, vn_default_error }, |
1510 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1511 | { &vop_create_desc, union_create }, /* create */ | |
88edbcd4 | 1512 | { &vop_whiteout_desc, union_whiteout }, /* whiteout */ |
12abe7b1 JSP |
1513 | { &vop_mknod_desc, union_mknod }, /* mknod */ |
1514 | { &vop_open_desc, union_open }, /* open */ | |
1515 | { &vop_close_desc, union_close }, /* close */ | |
1516 | { &vop_access_desc, union_access }, /* access */ | |
1517 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1518 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1519 | { &vop_read_desc, union_read }, /* read */ | |
1520 | { &vop_write_desc, union_write }, /* write */ | |
e77dc0c1 | 1521 | { &vop_lease_desc, union_lease }, /* lease */ |
12abe7b1 JSP |
1522 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ |
1523 | { &vop_select_desc, union_select }, /* select */ | |
1524 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1525 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1526 | { &vop_seek_desc, union_seek }, /* seek */ | |
1527 | { &vop_remove_desc, union_remove }, /* remove */ | |
1528 | { &vop_link_desc, union_link }, /* link */ | |
1529 | { &vop_rename_desc, union_rename }, /* rename */ | |
1530 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1531 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1532 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1533 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1534 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1535 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1536 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1537 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1538 | { &vop_lock_desc, union_lock }, /* lock */ | |
1539 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1540 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1541 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1542 | { &vop_print_desc, union_print }, /* print */ | |
1543 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1544 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1545 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1546 | #ifdef notdef | |
1547 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1548 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1549 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1550 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1551 | { &vop_update_desc, union_update }, /* update */ | |
1552 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1553 | #endif | |
a1fa407d JSP |
1554 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1555 | }; | |
1556 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1557 | { &union_vnodeop_p, union_vnodeop_entries }; |