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 | * | |
88edbcd4 | 11 | * @(#)union_vnops.c 8.19 (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 JSP |
313 | error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, |
314 | uppervp, lowervp); | |
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; | |
12abe7b1 | 345 | |
c1b204a8 JSP |
346 | FIXUP(un); |
347 | ||
12abe7b1 | 348 | VREF(dvp); |
e2a2f3a7 | 349 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
350 | vput(ap->a_dvp); |
351 | error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap); | |
352 | if (error) | |
353 | return (error); | |
354 | ||
355 | error = union_allocvp( | |
356 | ap->a_vpp, | |
79f80c71 JSP |
357 | ap->a_dvp->v_mount, |
358 | ap->a_dvp, | |
01dac67e | 359 | NULLVP, |
12abe7b1 JSP |
360 | ap->a_cnp, |
361 | vp, | |
362 | NULLVP); | |
01dac67e | 363 | if (error) |
e2a2f3a7 | 364 | vput(vp); |
12abe7b1 JSP |
365 | return (error); |
366 | } | |
367 | ||
368 | vput(ap->a_dvp); | |
369 | return (EROFS); | |
370 | } | |
371 | ||
88edbcd4 JSP |
372 | int |
373 | union_whiteout(ap) | |
374 | struct vop_whiteout_args /* { | |
375 | struct vnode *a_dvp; | |
376 | struct componentname *a_cnp; | |
377 | int a_flags; | |
378 | } */ *ap; | |
379 | { | |
380 | struct union_node *un = VTOUNION(ap->a_dvp); | |
381 | ||
382 | if (un->un_uppervp == NULLVP) | |
383 | return (EOPNOTSUPP); | |
384 | ||
385 | FIXUP(un); | |
386 | return (VOP_WHITEOUT(un->un_uppervp, ap->a_cnp, ap->a_flags)); | |
387 | } | |
388 | ||
12abe7b1 JSP |
389 | int |
390 | union_mknod(ap) | |
391 | struct vop_mknod_args /* { | |
392 | struct vnode *a_dvp; | |
393 | struct vnode **a_vpp; | |
394 | struct componentname *a_cnp; | |
395 | struct vattr *a_vap; | |
396 | } */ *ap; | |
397 | { | |
398 | struct union_node *un = VTOUNION(ap->a_dvp); | |
399 | struct vnode *dvp = un->un_uppervp; | |
400 | ||
050766c6 | 401 | if (dvp != NULLVP) { |
12abe7b1 JSP |
402 | int error; |
403 | struct vnode *vp; | |
12abe7b1 | 404 | |
c1b204a8 JSP |
405 | FIXUP(un); |
406 | ||
12abe7b1 | 407 | VREF(dvp); |
e2a2f3a7 | 408 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
409 | vput(ap->a_dvp); |
410 | error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap); | |
411 | if (error) | |
412 | return (error); | |
413 | ||
050766c6 | 414 | if (vp != NULLVP) { |
01dac67e JSP |
415 | error = union_allocvp( |
416 | ap->a_vpp, | |
79f80c71 JSP |
417 | ap->a_dvp->v_mount, |
418 | ap->a_dvp, | |
01dac67e JSP |
419 | NULLVP, |
420 | ap->a_cnp, | |
421 | vp, | |
422 | NULLVP); | |
01dac67e | 423 | if (error) |
e2a2f3a7 | 424 | vput(vp); |
01dac67e | 425 | } |
12abe7b1 JSP |
426 | return (error); |
427 | } | |
428 | ||
429 | vput(ap->a_dvp); | |
430 | return (EROFS); | |
431 | } | |
432 | ||
a1fa407d JSP |
433 | int |
434 | union_open(ap) | |
435 | struct vop_open_args /* { | |
436 | struct vnodeop_desc *a_desc; | |
437 | struct vnode *a_vp; | |
438 | int a_mode; | |
439 | struct ucred *a_cred; | |
440 | struct proc *a_p; | |
441 | } */ *ap; | |
442 | { | |
443 | struct union_node *un = VTOUNION(ap->a_vp); | |
01dac67e | 444 | struct vnode *tvp; |
a1fa407d JSP |
445 | int mode = ap->a_mode; |
446 | struct ucred *cred = ap->a_cred; | |
447 | struct proc *p = ap->a_p; | |
01dac67e | 448 | int error; |
a1fa407d JSP |
449 | |
450 | /* | |
451 | * If there is an existing upper vp then simply open that. | |
452 | */ | |
01dac67e JSP |
453 | tvp = un->un_uppervp; |
454 | if (tvp == NULLVP) { | |
a1fa407d | 455 | /* |
01dac67e JSP |
456 | * If the lower vnode is being opened for writing, then |
457 | * copy the file contents to the upper vnode and open that, | |
458 | * otherwise can simply open the lower vnode. | |
a1fa407d | 459 | */ |
01dac67e JSP |
460 | tvp = un->un_lowervp; |
461 | if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { | |
6f40eb24 | 462 | error = union_copyup(un, (mode&O_TRUNC) == 0, cred, p); |
01dac67e JSP |
463 | if (error == 0) |
464 | error = VOP_OPEN(un->un_uppervp, mode, cred, p); | |
01dac67e | 465 | return (error); |
a1fa407d | 466 | } |
e2a2f3a7 JSP |
467 | |
468 | /* | |
469 | * Just open the lower vnode | |
470 | */ | |
ed5969c8 | 471 | un->un_openl++; |
e2a2f3a7 JSP |
472 | VOP_LOCK(tvp); |
473 | error = VOP_OPEN(tvp, mode, cred, p); | |
474 | VOP_UNLOCK(tvp); | |
475 | ||
476 | return (error); | |
a1fa407d JSP |
477 | } |
478 | ||
c1b204a8 JSP |
479 | FIXUP(un); |
480 | ||
01dac67e | 481 | error = VOP_OPEN(tvp, mode, cred, p); |
01dac67e JSP |
482 | |
483 | return (error); | |
a1fa407d JSP |
484 | } |
485 | ||
12abe7b1 JSP |
486 | int |
487 | union_close(ap) | |
488 | struct vop_close_args /* { | |
489 | struct vnode *a_vp; | |
490 | int a_fflag; | |
491 | struct ucred *a_cred; | |
492 | struct proc *a_p; | |
493 | } */ *ap; | |
494 | { | |
3b293975 JSP |
495 | struct union_node *un = VTOUNION(ap->a_vp); |
496 | struct vnode *vp; | |
12abe7b1 | 497 | |
050766c6 | 498 | if (un->un_uppervp != NULLVP) { |
3b293975 JSP |
499 | vp = un->un_uppervp; |
500 | } else { | |
ed5969c8 JSP |
501 | #ifdef UNION_DIAGNOSTIC |
502 | if (un->un_openl <= 0) | |
503 | panic("union: un_openl cnt"); | |
3b293975 | 504 | #endif |
ed5969c8 | 505 | --un->un_openl; |
3b293975 JSP |
506 | vp = un->un_lowervp; |
507 | } | |
ed5969c8 | 508 | |
3b293975 | 509 | return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p)); |
12abe7b1 JSP |
510 | } |
511 | ||
512 | /* | |
513 | * Check access permission on the union vnode. | |
514 | * The access check being enforced is to check | |
515 | * against both the underlying vnode, and any | |
516 | * copied vnode. This ensures that no additional | |
517 | * file permissions are given away simply because | |
518 | * the user caused an implicit file copy. | |
519 | */ | |
520 | int | |
521 | union_access(ap) | |
522 | struct vop_access_args /* { | |
523 | struct vnodeop_desc *a_desc; | |
524 | struct vnode *a_vp; | |
525 | int a_mode; | |
526 | struct ucred *a_cred; | |
527 | struct proc *a_p; | |
528 | } */ *ap; | |
529 | { | |
530 | struct union_node *un = VTOUNION(ap->a_vp); | |
7315c41f | 531 | int error = EACCES; |
12abe7b1 JSP |
532 | struct vnode *vp; |
533 | ||
050766c6 | 534 | if ((vp = un->un_uppervp) != NULLVP) { |
c1b204a8 JSP |
535 | FIXUP(un); |
536 | return (VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p)); | |
537 | } | |
538 | ||
050766c6 | 539 | if ((vp = un->un_lowervp) != NULLVP) { |
01dac67e | 540 | VOP_LOCK(vp); |
12abe7b1 | 541 | error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p); |
c1b204a8 JSP |
542 | if (error == 0) { |
543 | struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount); | |
544 | ||
545 | if (um->um_op == UNMNT_BELOW) | |
546 | error = VOP_ACCESS(vp, ap->a_mode, | |
547 | um->um_cred, ap->a_p); | |
548 | } | |
01dac67e | 549 | VOP_UNLOCK(vp); |
12abe7b1 JSP |
550 | if (error) |
551 | return (error); | |
552 | } | |
553 | ||
01dac67e | 554 | return (error); |
12abe7b1 JSP |
555 | } |
556 | ||
a1fa407d | 557 | /* |
8a9c17f6 JSP |
558 | * We handle getattr only to change the fsid and |
559 | * track object sizes | |
a1fa407d JSP |
560 | */ |
561 | int | |
562 | union_getattr(ap) | |
563 | struct vop_getattr_args /* { | |
564 | struct vnode *a_vp; | |
565 | struct vattr *a_vap; | |
566 | struct ucred *a_cred; | |
567 | struct proc *a_p; | |
568 | } */ *ap; | |
569 | { | |
570 | int error; | |
0931f2d9 JSP |
571 | struct union_node *un = VTOUNION(ap->a_vp); |
572 | struct vnode *vp = un->un_uppervp; | |
573 | struct vattr *vap; | |
574 | struct vattr va; | |
575 | ||
576 | ||
577 | /* | |
578 | * Some programs walk the filesystem hierarchy by counting | |
579 | * links to directories to avoid stat'ing all the time. | |
580 | * This means the link count on directories needs to be "correct". | |
581 | * The only way to do that is to call getattr on both layers | |
582 | * and fix up the link count. The link count will not necessarily | |
583 | * be accurate but will be large enough to defeat the tree walkers. | |
584 | */ | |
585 | ||
586 | vap = ap->a_vap; | |
587 | ||
588 | vp = un->un_uppervp; | |
589 | if (vp != NULLVP) { | |
463c0360 JSP |
590 | /* |
591 | * It's not clear whether VOP_GETATTR is to be | |
592 | * called with the vnode locked or not. stat() calls | |
593 | * it with (vp) locked, and fstat calls it with | |
594 | * (vp) unlocked. | |
595 | * In the mean time, compensate here by checking | |
596 | * the union_node's lock flag. | |
597 | */ | |
598 | if (un->un_flags & UN_LOCKED) | |
599 | FIXUP(un); | |
600 | ||
0931f2d9 JSP |
601 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
602 | if (error) | |
603 | return (error); | |
8a9c17f6 | 604 | union_newsize(ap->a_vp, vap->va_size, VNOVAL); |
0931f2d9 | 605 | } |
01dac67e | 606 | |
0931f2d9 JSP |
607 | if (vp == NULLVP) { |
608 | vp = un->un_lowervp; | |
609 | } else if (vp->v_type == VDIR) { | |
610 | vp = un->un_lowervp; | |
611 | vap = &va; | |
612 | } else { | |
613 | vp = NULLVP; | |
614 | } | |
615 | ||
616 | if (vp != NULLVP) { | |
e2a2f3a7 | 617 | VOP_LOCK(vp); |
0931f2d9 | 618 | error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p); |
e2a2f3a7 | 619 | VOP_UNLOCK(vp); |
0931f2d9 JSP |
620 | if (error) |
621 | return (error); | |
8a9c17f6 | 622 | union_newsize(ap->a_vp, VNOVAL, vap->va_size); |
0931f2d9 JSP |
623 | } |
624 | ||
625 | if ((vap != ap->a_vap) && (vap->va_type == VDIR)) | |
626 | ap->a_vap->va_nlink += vap->va_nlink; | |
a1fa407d | 627 | |
8de82e02 | 628 | ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; |
a1fa407d JSP |
629 | return (0); |
630 | } | |
631 | ||
a1fa407d | 632 | int |
01dac67e | 633 | union_setattr(ap) |
12abe7b1 | 634 | struct vop_setattr_args /* { |
a1fa407d | 635 | struct vnode *a_vp; |
12abe7b1 | 636 | struct vattr *a_vap; |
a1fa407d | 637 | struct ucred *a_cred; |
12abe7b1 | 638 | struct proc *a_p; |
a1fa407d JSP |
639 | } */ *ap; |
640 | { | |
641 | struct union_node *un = VTOUNION(ap->a_vp); | |
12abe7b1 | 642 | int error; |
a1fa407d | 643 | |
d596128e JSP |
644 | /* |
645 | * Handle case of truncating lower object to zero size, | |
646 | * by creating a zero length upper object. This is to | |
647 | * handle the case of open with O_TRUNC and O_CREAT. | |
648 | */ | |
649 | if ((un->un_uppervp == NULLVP) && | |
650 | /* assert(un->un_lowervp != NULLVP) */ | |
88edbcd4 JSP |
651 | (un->un_lowervp->v_type == VREG)) { |
652 | error = union_copyup(un, (ap->a_vap->va_size != 0), | |
653 | ap->a_cred, ap->a_p); | |
d596128e JSP |
654 | if (error) |
655 | return (error); | |
d596128e JSP |
656 | } |
657 | ||
658 | /* | |
659 | * Try to set attributes in upper layer, | |
660 | * otherwise return read-only filesystem error. | |
661 | */ | |
662 | if (un->un_uppervp != NULLVP) { | |
c1b204a8 | 663 | FIXUP(un); |
12abe7b1 JSP |
664 | error = VOP_SETATTR(un->un_uppervp, ap->a_vap, |
665 | ap->a_cred, ap->a_p); | |
8a9c17f6 JSP |
666 | if ((error == 0) && (ap->a_vap->va_size != VNOVAL)) |
667 | union_newsize(ap->a_vp, ap->a_vap->va_size, VNOVAL); | |
12abe7b1 | 668 | } else { |
12abe7b1 JSP |
669 | error = EROFS; |
670 | } | |
a1fa407d | 671 | |
12abe7b1 | 672 | return (error); |
a1fa407d JSP |
673 | } |
674 | ||
675 | int | |
12abe7b1 JSP |
676 | union_read(ap) |
677 | struct vop_read_args /* { | |
a1fa407d | 678 | struct vnode *a_vp; |
12abe7b1 JSP |
679 | struct uio *a_uio; |
680 | int a_ioflag; | |
681 | struct ucred *a_cred; | |
a1fa407d JSP |
682 | } */ *ap; |
683 | { | |
12abe7b1 JSP |
684 | int error; |
685 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 686 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 687 | |
e2a2f3a7 JSP |
688 | if (dolock) |
689 | VOP_LOCK(vp); | |
c1b204a8 JSP |
690 | else |
691 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 692 | error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
e2a2f3a7 JSP |
693 | if (dolock) |
694 | VOP_UNLOCK(vp); | |
12abe7b1 | 695 | |
8a9c17f6 JSP |
696 | /* |
697 | * XXX | |
698 | * perhaps the size of the underlying object has changed under | |
699 | * our feet. take advantage of the offset information present | |
700 | * in the uio structure. | |
701 | */ | |
702 | if (error == 0) { | |
703 | struct union_node *un = VTOUNION(ap->a_vp); | |
704 | off_t cur = ap->a_uio->uio_offset; | |
705 | ||
706 | if (vp == un->un_uppervp) { | |
707 | if (cur > un->un_uppersz) | |
708 | union_newsize(ap->a_vp, cur, VNOVAL); | |
709 | } else { | |
710 | if (cur > un->un_lowersz) | |
711 | union_newsize(ap->a_vp, VNOVAL, cur); | |
712 | } | |
713 | } | |
714 | ||
12abe7b1 | 715 | return (error); |
a1fa407d JSP |
716 | } |
717 | ||
718 | int | |
12abe7b1 JSP |
719 | union_write(ap) |
720 | struct vop_read_args /* { | |
a1fa407d | 721 | struct vnode *a_vp; |
12abe7b1 JSP |
722 | struct uio *a_uio; |
723 | int a_ioflag; | |
724 | struct ucred *a_cred; | |
a1fa407d JSP |
725 | } */ *ap; |
726 | { | |
12abe7b1 | 727 | int error; |
88edbcd4 JSP |
728 | struct vnode *vp; |
729 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 730 | |
88edbcd4 JSP |
731 | vp = UPPERVP(ap->a_vp); |
732 | if (vp == NULLVP) | |
733 | panic("union: missing upper layer in write"); | |
734 | ||
735 | FIXUP(un); | |
12abe7b1 | 736 | error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); |
a1fa407d | 737 | |
8a9c17f6 JSP |
738 | /* |
739 | * the size of the underlying object may be changed by the | |
740 | * write. | |
741 | */ | |
742 | if (error == 0) { | |
8a9c17f6 JSP |
743 | off_t cur = ap->a_uio->uio_offset; |
744 | ||
88edbcd4 JSP |
745 | if (cur > un->un_uppersz) |
746 | union_newsize(ap->a_vp, cur, VNOVAL); | |
8a9c17f6 JSP |
747 | } |
748 | ||
12abe7b1 JSP |
749 | return (error); |
750 | } | |
a1fa407d JSP |
751 | |
752 | int | |
12abe7b1 JSP |
753 | union_ioctl(ap) |
754 | struct vop_ioctl_args /* { | |
a1fa407d | 755 | struct vnode *a_vp; |
12abe7b1 JSP |
756 | int a_command; |
757 | caddr_t a_data; | |
758 | int a_fflag; | |
759 | struct ucred *a_cred; | |
760 | struct proc *a_p; | |
a1fa407d JSP |
761 | } */ *ap; |
762 | { | |
a1fa407d | 763 | |
12abe7b1 JSP |
764 | return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data, |
765 | ap->a_fflag, ap->a_cred, ap->a_p)); | |
a1fa407d JSP |
766 | } |
767 | ||
a1fa407d | 768 | int |
12abe7b1 JSP |
769 | union_select(ap) |
770 | struct vop_select_args /* { | |
771 | struct vnode *a_vp; | |
772 | int a_which; | |
773 | int a_fflags; | |
774 | struct ucred *a_cred; | |
775 | struct proc *a_p; | |
776 | } */ *ap; | |
777 | { | |
778 | ||
779 | return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags, | |
780 | ap->a_cred, ap->a_p)); | |
781 | } | |
782 | ||
783 | int | |
784 | union_mmap(ap) | |
785 | struct vop_mmap_args /* { | |
786 | struct vnode *a_vp; | |
787 | int a_fflags; | |
788 | struct ucred *a_cred; | |
789 | struct proc *a_p; | |
790 | } */ *ap; | |
791 | { | |
792 | ||
793 | return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags, | |
794 | ap->a_cred, ap->a_p)); | |
795 | } | |
796 | ||
797 | int | |
798 | union_fsync(ap) | |
799 | struct vop_fsync_args /* { | |
800 | struct vnode *a_vp; | |
801 | struct ucred *a_cred; | |
802 | int a_waitfor; | |
803 | struct proc *a_p; | |
804 | } */ *ap; | |
805 | { | |
806 | int error = 0; | |
807 | struct vnode *targetvp = OTHERVP(ap->a_vp); | |
808 | ||
050766c6 | 809 | if (targetvp != NULLVP) { |
e2a2f3a7 JSP |
810 | int dolock = (targetvp == LOWERVP(ap->a_vp)); |
811 | ||
812 | if (dolock) | |
813 | VOP_LOCK(targetvp); | |
c1b204a8 JSP |
814 | else |
815 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 JSP |
816 | error = VOP_FSYNC(targetvp, ap->a_cred, |
817 | ap->a_waitfor, ap->a_p); | |
e2a2f3a7 JSP |
818 | if (dolock) |
819 | VOP_UNLOCK(targetvp); | |
12abe7b1 JSP |
820 | } |
821 | ||
822 | return (error); | |
823 | } | |
824 | ||
825 | int | |
826 | union_seek(ap) | |
827 | struct vop_seek_args /* { | |
828 | struct vnode *a_vp; | |
829 | off_t a_oldoff; | |
830 | off_t a_newoff; | |
831 | struct ucred *a_cred; | |
832 | } */ *ap; | |
833 | { | |
834 | ||
835 | return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred)); | |
836 | } | |
837 | ||
838 | int | |
839 | union_remove(ap) | |
840 | struct vop_remove_args /* { | |
841 | struct vnode *a_dvp; | |
842 | struct vnode *a_vp; | |
843 | struct componentname *a_cnp; | |
a1fa407d JSP |
844 | } */ *ap; |
845 | { | |
a1fa407d | 846 | int error; |
12abe7b1 JSP |
847 | struct union_node *dun = VTOUNION(ap->a_dvp); |
848 | struct union_node *un = VTOUNION(ap->a_vp); | |
a1fa407d | 849 | |
88edbcd4 JSP |
850 | if (dun->un_uppervp == NULLVP) |
851 | panic("union remove: null upper vnode"); | |
852 | ||
853 | if (un->un_uppervp != NULLVP) { | |
12abe7b1 JSP |
854 | struct vnode *dvp = dun->un_uppervp; |
855 | struct vnode *vp = un->un_uppervp; | |
a1fa407d | 856 | |
c1b204a8 | 857 | FIXUP(dun); |
12abe7b1 | 858 | VREF(dvp); |
e2a2f3a7 | 859 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 860 | vput(ap->a_dvp); |
c1b204a8 | 861 | FIXUP(un); |
12abe7b1 | 862 | VREF(vp); |
e2a2f3a7 | 863 | un->un_flags |= UN_KLOCK; |
12abe7b1 | 864 | vput(ap->a_vp); |
a1fa407d | 865 | |
88edbcd4 JSP |
866 | if (un->un_lowervp != NULLVP) |
867 | ap->a_cnp->cn_flags |= DOWHITEOUT; | |
12abe7b1 | 868 | error = VOP_REMOVE(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
869 | if (!error) |
870 | union_removed_upper(un); | |
12abe7b1 | 871 | } else { |
88edbcd4 JSP |
872 | FIXUP(dun); |
873 | error = union_mkwhiteout( | |
874 | MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), | |
875 | dun->un_uppervp, ap->a_cnp, un->un_path); | |
12abe7b1 JSP |
876 | vput(ap->a_dvp); |
877 | vput(ap->a_vp); | |
12abe7b1 JSP |
878 | } |
879 | ||
880 | return (error); | |
881 | } | |
882 | ||
883 | int | |
884 | union_link(ap) | |
885 | struct vop_link_args /* { | |
886 | struct vnode *a_vp; | |
887 | struct vnode *a_tdvp; | |
888 | struct componentname *a_cnp; | |
889 | } */ *ap; | |
890 | { | |
6f40eb24 JSP |
891 | int error = 0; |
892 | struct union_node *un; | |
893 | struct vnode *vp; | |
894 | struct vnode *tdvp; | |
12abe7b1 | 895 | |
6f40eb24 | 896 | un = VTOUNION(ap->a_vp); |
12abe7b1 | 897 | |
6f40eb24 JSP |
898 | if (ap->a_vp->v_op != ap->a_tdvp->v_op) { |
899 | tdvp = ap->a_tdvp; | |
12abe7b1 | 900 | } else { |
6f40eb24 JSP |
901 | struct union_node *tdun = VTOUNION(ap->a_tdvp); |
902 | if (tdun->un_uppervp == NULLVP) { | |
903 | VOP_LOCK(ap->a_tdvp); | |
904 | if (un->un_uppervp == tdun->un_dirvp) { | |
905 | un->un_flags &= ~UN_ULOCK; | |
906 | VOP_UNLOCK(un->un_uppervp); | |
907 | } | |
908 | error = union_copyup(tdun, 1, ap->a_cnp->cn_cred, | |
909 | ap->a_cnp->cn_proc); | |
910 | if (un->un_uppervp == tdun->un_dirvp) { | |
911 | VOP_LOCK(un->un_uppervp); | |
912 | un->un_flags |= UN_ULOCK; | |
913 | } | |
914 | VOP_UNLOCK(ap->a_tdvp); | |
915 | } | |
916 | tdvp = tdun->un_uppervp; | |
917 | } | |
918 | ||
919 | vp = un->un_uppervp; | |
920 | if (vp == NULLVP) | |
12abe7b1 | 921 | error = EROFS; |
6f40eb24 JSP |
922 | |
923 | if (error) { | |
924 | vput(ap->a_vp); | |
925 | return (error); | |
12abe7b1 | 926 | } |
a1fa407d | 927 | |
6f40eb24 JSP |
928 | FIXUP(un); |
929 | VREF(vp); | |
930 | un->un_flags |= UN_KLOCK; | |
931 | vput(ap->a_vp); | |
932 | ||
933 | return (VOP_LINK(vp, tdvp, ap->a_cnp)); | |
a1fa407d JSP |
934 | } |
935 | ||
12abe7b1 JSP |
936 | int |
937 | union_rename(ap) | |
938 | struct vop_rename_args /* { | |
939 | struct vnode *a_fdvp; | |
940 | struct vnode *a_fvp; | |
941 | struct componentname *a_fcnp; | |
942 | struct vnode *a_tdvp; | |
943 | struct vnode *a_tvp; | |
944 | struct componentname *a_tcnp; | |
945 | } */ *ap; | |
946 | { | |
947 | int error; | |
948 | ||
949 | struct vnode *fdvp = ap->a_fdvp; | |
950 | struct vnode *fvp = ap->a_fvp; | |
951 | struct vnode *tdvp = ap->a_tdvp; | |
952 | struct vnode *tvp = ap->a_tvp; | |
953 | ||
954 | if (fdvp->v_op == union_vnodeop_p) { /* always true */ | |
955 | struct union_node *un = VTOUNION(fdvp); | |
3b293975 | 956 | if (un->un_uppervp == NULLVP) { |
88edbcd4 JSP |
957 | /* |
958 | * this should never happen in normal | |
959 | * operation but might if there was | |
960 | * a problem creating the top-level shadow | |
961 | * directory. | |
962 | */ | |
963 | error = EXDEV; | |
12abe7b1 JSP |
964 | goto bad; |
965 | } | |
966 | ||
967 | fdvp = un->un_uppervp; | |
968 | VREF(fdvp); | |
969 | vrele(ap->a_fdvp); | |
970 | } | |
971 | ||
972 | if (fvp->v_op == union_vnodeop_p) { /* always true */ | |
973 | struct union_node *un = VTOUNION(fvp); | |
3b293975 | 974 | if (un->un_uppervp == NULLVP) { |
88edbcd4 JSP |
975 | /* XXX: should do a copyup */ |
976 | error = EXDEV; | |
12abe7b1 JSP |
977 | goto bad; |
978 | } | |
979 | ||
88edbcd4 JSP |
980 | if (un->un_lowervp != NULLVP) |
981 | ap->a_fcnp->cn_flags |= DOWHITEOUT; | |
982 | ||
12abe7b1 JSP |
983 | fvp = un->un_uppervp; |
984 | VREF(fvp); | |
985 | vrele(ap->a_fvp); | |
986 | } | |
987 | ||
988 | if (tdvp->v_op == union_vnodeop_p) { | |
989 | struct union_node *un = VTOUNION(tdvp); | |
3b293975 | 990 | if (un->un_uppervp == NULLVP) { |
050766c6 JSP |
991 | /* |
992 | * this should never happen in normal | |
993 | * operation but might if there was | |
994 | * a problem creating the top-level shadow | |
995 | * directory. | |
996 | */ | |
88edbcd4 | 997 | error = EXDEV; |
12abe7b1 JSP |
998 | goto bad; |
999 | } | |
1000 | ||
1001 | tdvp = un->un_uppervp; | |
1002 | VREF(tdvp); | |
e2a2f3a7 | 1003 | un->un_flags |= UN_KLOCK; |
3b293975 | 1004 | vput(ap->a_tdvp); |
12abe7b1 JSP |
1005 | } |
1006 | ||
050766c6 | 1007 | if (tvp != NULLVP && tvp->v_op == union_vnodeop_p) { |
12abe7b1 | 1008 | struct union_node *un = VTOUNION(tvp); |
12abe7b1 JSP |
1009 | |
1010 | tvp = un->un_uppervp; | |
050766c6 JSP |
1011 | if (tvp != NULLVP) { |
1012 | VREF(tvp); | |
1013 | un->un_flags |= UN_KLOCK; | |
1014 | } | |
12abe7b1 JSP |
1015 | vput(ap->a_tvp); |
1016 | } | |
1017 | ||
1018 | return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp)); | |
1019 | ||
1020 | bad: | |
1021 | vrele(fdvp); | |
1022 | vrele(fvp); | |
1023 | vput(tdvp); | |
050766c6 | 1024 | if (tvp != NULLVP) |
12abe7b1 JSP |
1025 | vput(tvp); |
1026 | ||
1027 | return (error); | |
1028 | } | |
1029 | ||
1030 | int | |
1031 | union_mkdir(ap) | |
1032 | struct vop_mkdir_args /* { | |
1033 | struct vnode *a_dvp; | |
1034 | struct vnode **a_vpp; | |
1035 | struct componentname *a_cnp; | |
1036 | struct vattr *a_vap; | |
1037 | } */ *ap; | |
1038 | { | |
1039 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1040 | struct vnode *dvp = un->un_uppervp; | |
1041 | ||
050766c6 | 1042 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1043 | int error; |
1044 | struct vnode *vp; | |
12abe7b1 | 1045 | |
c1b204a8 | 1046 | FIXUP(un); |
12abe7b1 | 1047 | VREF(dvp); |
e2a2f3a7 | 1048 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1049 | vput(ap->a_dvp); |
1050 | error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap); | |
1051 | if (error) | |
1052 | return (error); | |
1053 | ||
1054 | error = union_allocvp( | |
1055 | ap->a_vpp, | |
79f80c71 JSP |
1056 | ap->a_dvp->v_mount, |
1057 | ap->a_dvp, | |
01dac67e | 1058 | NULLVP, |
12abe7b1 JSP |
1059 | ap->a_cnp, |
1060 | vp, | |
1061 | NULLVP); | |
01dac67e | 1062 | if (error) |
e2a2f3a7 | 1063 | vput(vp); |
12abe7b1 JSP |
1064 | return (error); |
1065 | } | |
1066 | ||
1067 | vput(ap->a_dvp); | |
1068 | return (EROFS); | |
1069 | } | |
1070 | ||
1071 | int | |
1072 | union_rmdir(ap) | |
1073 | struct vop_rmdir_args /* { | |
1074 | struct vnode *a_dvp; | |
1075 | struct vnode *a_vp; | |
1076 | struct componentname *a_cnp; | |
1077 | } */ *ap; | |
1078 | { | |
1079 | int error; | |
1080 | struct union_node *dun = VTOUNION(ap->a_dvp); | |
1081 | struct union_node *un = VTOUNION(ap->a_vp); | |
1082 | ||
88edbcd4 JSP |
1083 | if (dun->un_uppervp == NULLVP) |
1084 | panic("union rmdir: null upper vnode"); | |
1085 | ||
1086 | if (un->un_uppervp != NULLVP) { | |
12abe7b1 JSP |
1087 | struct vnode *dvp = dun->un_uppervp; |
1088 | struct vnode *vp = un->un_uppervp; | |
1089 | ||
c1b204a8 | 1090 | FIXUP(dun); |
12abe7b1 | 1091 | VREF(dvp); |
e2a2f3a7 | 1092 | dun->un_flags |= UN_KLOCK; |
12abe7b1 | 1093 | vput(ap->a_dvp); |
c1b204a8 | 1094 | FIXUP(un); |
12abe7b1 | 1095 | VREF(vp); |
e2a2f3a7 | 1096 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1097 | vput(ap->a_vp); |
1098 | ||
88edbcd4 JSP |
1099 | if (un->un_lowervp != NULLVP) |
1100 | ap->a_cnp->cn_flags |= DOWHITEOUT; | |
e2a2f3a7 | 1101 | error = VOP_RMDIR(dvp, vp, ap->a_cnp); |
ed5969c8 JSP |
1102 | if (!error) |
1103 | union_removed_upper(un); | |
12abe7b1 | 1104 | } else { |
88edbcd4 JSP |
1105 | FIXUP(dun); |
1106 | error = union_mkwhiteout( | |
1107 | MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), | |
1108 | dun->un_uppervp, ap->a_cnp, un->un_path); | |
12abe7b1 JSP |
1109 | vput(ap->a_dvp); |
1110 | vput(ap->a_vp); | |
12abe7b1 JSP |
1111 | } |
1112 | ||
1113 | return (error); | |
1114 | } | |
1115 | ||
1116 | int | |
1117 | union_symlink(ap) | |
1118 | struct vop_symlink_args /* { | |
1119 | struct vnode *a_dvp; | |
1120 | struct vnode **a_vpp; | |
1121 | struct componentname *a_cnp; | |
1122 | struct vattr *a_vap; | |
1123 | char *a_target; | |
1124 | } */ *ap; | |
1125 | { | |
1126 | struct union_node *un = VTOUNION(ap->a_dvp); | |
1127 | struct vnode *dvp = un->un_uppervp; | |
1128 | ||
050766c6 | 1129 | if (dvp != NULLVP) { |
12abe7b1 JSP |
1130 | int error; |
1131 | struct vnode *vp; | |
1132 | struct mount *mp = ap->a_dvp->v_mount; | |
1133 | ||
c1b204a8 | 1134 | FIXUP(un); |
12abe7b1 | 1135 | VREF(dvp); |
e2a2f3a7 | 1136 | un->un_flags |= UN_KLOCK; |
12abe7b1 JSP |
1137 | vput(ap->a_dvp); |
1138 | error = VOP_SYMLINK(dvp, &vp, ap->a_cnp, | |
1139 | ap->a_vap, ap->a_target); | |
3b293975 | 1140 | *ap->a_vpp = NULLVP; |
12abe7b1 JSP |
1141 | return (error); |
1142 | } | |
1143 | ||
1144 | vput(ap->a_dvp); | |
1145 | return (EROFS); | |
1146 | } | |
a1fa407d JSP |
1147 | |
1148 | /* | |
12abe7b1 JSP |
1149 | * union_readdir works in concert with getdirentries and |
1150 | * readdir(3) to provide a list of entries in the unioned | |
1151 | * directories. getdirentries is responsible for walking | |
1152 | * down the union stack. readdir(3) is responsible for | |
1153 | * eliminating duplicate names from the returned data stream. | |
a1fa407d JSP |
1154 | */ |
1155 | int | |
12abe7b1 JSP |
1156 | union_readdir(ap) |
1157 | struct vop_readdir_args /* { | |
1158 | struct vnodeop_desc *a_desc; | |
1159 | struct vnode *a_vp; | |
1160 | struct uio *a_uio; | |
1161 | struct ucred *a_cred; | |
94b29fae KM |
1162 | int *a_eofflag; |
1163 | u_long *a_cookies; | |
1164 | int a_ncookies; | |
12abe7b1 JSP |
1165 | } */ *ap; |
1166 | { | |
94b29fae KM |
1167 | register struct union_node *un = VTOUNION(ap->a_vp); |
1168 | register struct vnode *uvp = un->un_uppervp; | |
12abe7b1 | 1169 | |
94b29fae KM |
1170 | if (uvp == NULLVP) |
1171 | return (0); | |
12abe7b1 | 1172 | |
94b29fae KM |
1173 | FIXUP(un); |
1174 | ap->a_vp = uvp; | |
1175 | return (VOCALL(uvp->v_op, VOFFSET(vop_readdir), ap)); | |
12abe7b1 JSP |
1176 | } |
1177 | ||
1178 | int | |
1179 | union_readlink(ap) | |
1180 | struct vop_readlink_args /* { | |
1181 | struct vnode *a_vp; | |
1182 | struct uio *a_uio; | |
1183 | struct ucred *a_cred; | |
a1fa407d JSP |
1184 | } */ *ap; |
1185 | { | |
a1fa407d | 1186 | int error; |
12abe7b1 | 1187 | struct vnode *vp = OTHERVP(ap->a_vp); |
e2a2f3a7 | 1188 | int dolock = (vp == LOWERVP(ap->a_vp)); |
a1fa407d | 1189 | |
e2a2f3a7 JSP |
1190 | if (dolock) |
1191 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1192 | else |
1193 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1194 | error = VOP_READLINK(vp, ap->a_uio, ap->a_cred); |
e2a2f3a7 JSP |
1195 | if (dolock) |
1196 | VOP_UNLOCK(vp); | |
a1fa407d | 1197 | |
12abe7b1 JSP |
1198 | return (error); |
1199 | } | |
a1fa407d | 1200 | |
12abe7b1 JSP |
1201 | int |
1202 | union_abortop(ap) | |
1203 | struct vop_abortop_args /* { | |
1204 | struct vnode *a_dvp; | |
1205 | struct componentname *a_cnp; | |
1206 | } */ *ap; | |
1207 | { | |
1208 | int error; | |
01dac67e | 1209 | struct vnode *vp = OTHERVP(ap->a_dvp); |
12abe7b1 JSP |
1210 | struct union_node *un = VTOUNION(ap->a_dvp); |
1211 | int islocked = un->un_flags & UN_LOCKED; | |
e2a2f3a7 | 1212 | int dolock = (vp == LOWERVP(ap->a_dvp)); |
a1fa407d | 1213 | |
c1b204a8 JSP |
1214 | if (islocked) { |
1215 | if (dolock) | |
1216 | VOP_LOCK(vp); | |
1217 | else | |
1218 | FIXUP(VTOUNION(ap->a_dvp)); | |
1219 | } | |
12abe7b1 | 1220 | error = VOP_ABORTOP(vp, ap->a_cnp); |
e2a2f3a7 | 1221 | if (islocked && dolock) |
12abe7b1 | 1222 | VOP_UNLOCK(vp); |
a1fa407d JSP |
1223 | |
1224 | return (error); | |
1225 | } | |
1226 | ||
12abe7b1 JSP |
1227 | int |
1228 | union_inactive(ap) | |
1229 | struct vop_inactive_args /* { | |
1230 | struct vnode *a_vp; | |
1231 | } */ *ap; | |
1232 | { | |
463c0360 | 1233 | struct union_node *un = VTOUNION(ap->a_vp); |
12abe7b1 JSP |
1234 | |
1235 | /* | |
1236 | * Do nothing (and _don't_ bypass). | |
1237 | * Wait to vrele lowervp until reclaim, | |
1238 | * so that until then our union_node is in the | |
1239 | * cache and reusable. | |
1240 | * | |
1241 | * NEEDSWORK: Someday, consider inactive'ing | |
1242 | * the lowervp and then trying to reactivate it | |
1243 | * with capabilities (v_id) | |
1244 | * like they do in the name lookup cache code. | |
1245 | * That's too much work for now. | |
1246 | */ | |
79f80c71 | 1247 | |
ed5969c8 | 1248 | #ifdef UNION_DIAGNOSTIC |
79f80c71 JSP |
1249 | if (un->un_flags & UN_LOCKED) |
1250 | panic("union: inactivating locked node"); | |
463c0360 JSP |
1251 | if (un->un_flags & UN_ULOCK) |
1252 | panic("union: inactivating w/locked upper node"); | |
79f80c71 JSP |
1253 | #endif |
1254 | ||
463c0360 JSP |
1255 | if ((un->un_flags & UN_CACHED) == 0) |
1256 | vgone(ap->a_vp); | |
1257 | ||
12abe7b1 JSP |
1258 | return (0); |
1259 | } | |
1260 | ||
1261 | int | |
1262 | union_reclaim(ap) | |
1263 | struct vop_reclaim_args /* { | |
1264 | struct vnode *a_vp; | |
1265 | } */ *ap; | |
1266 | { | |
12abe7b1 | 1267 | |
58572fc0 JSP |
1268 | union_freevp(ap->a_vp); |
1269 | ||
12abe7b1 JSP |
1270 | return (0); |
1271 | } | |
1272 | ||
a1fa407d JSP |
1273 | int |
1274 | union_lock(ap) | |
1275 | struct vop_lock_args *ap; | |
1276 | { | |
7315c41f JSP |
1277 | struct vnode *vp = ap->a_vp; |
1278 | struct union_node *un; | |
1279 | ||
1280 | start: | |
1281 | while (vp->v_flag & VXLOCK) { | |
1282 | vp->v_flag |= VXWANT; | |
1283 | sleep((caddr_t)vp, PINOD); | |
1284 | } | |
1285 | ||
1286 | un = VTOUNION(vp); | |
a1fa407d | 1287 | |
050766c6 | 1288 | if (un->un_uppervp != NULLVP) { |
2e2839fc JSP |
1289 | if (((un->un_flags & UN_ULOCK) == 0) && |
1290 | (vp->v_usecount != 0)) { | |
e2a2f3a7 | 1291 | un->un_flags |= UN_ULOCK; |
7315c41f | 1292 | VOP_LOCK(un->un_uppervp); |
e2a2f3a7 JSP |
1293 | } |
1294 | #ifdef DIAGNOSTIC | |
1295 | if (un->un_flags & UN_KLOCK) | |
1296 | panic("union: dangling upper lock"); | |
1297 | #endif | |
1298 | } | |
1299 | ||
7315c41f | 1300 | if (un->un_flags & UN_LOCKED) { |
a1fa407d | 1301 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1302 | if (curproc && un->un_pid == curproc->p_pid && |
1303 | un->un_pid > -1 && curproc->p_pid > -1) | |
1304 | panic("union: locking against myself"); | |
a1fa407d | 1305 | #endif |
a1fa407d JSP |
1306 | un->un_flags |= UN_WANT; |
1307 | sleep((caddr_t) &un->un_flags, PINOD); | |
7315c41f | 1308 | goto start; |
a1fa407d | 1309 | } |
79f80c71 | 1310 | |
a1fa407d | 1311 | #ifdef DIAGNOSTIC |
79f80c71 JSP |
1312 | if (curproc) |
1313 | un->un_pid = curproc->p_pid; | |
1314 | else | |
1315 | un->un_pid = -1; | |
a1fa407d | 1316 | #endif |
15a86f7e | 1317 | |
7315c41f | 1318 | un->un_flags |= UN_LOCKED; |
15a86f7e | 1319 | return (0); |
a1fa407d JSP |
1320 | } |
1321 | ||
1322 | int | |
1323 | union_unlock(ap) | |
1324 | struct vop_lock_args *ap; | |
1325 | { | |
1326 | struct union_node *un = VTOUNION(ap->a_vp); | |
1327 | ||
1328 | #ifdef DIAGNOSTIC | |
a1fa407d JSP |
1329 | if ((un->un_flags & UN_LOCKED) == 0) |
1330 | panic("union: unlock unlocked node"); | |
79f80c71 JSP |
1331 | if (curproc && un->un_pid != curproc->p_pid && |
1332 | curproc->p_pid > -1 && un->un_pid > -1) | |
01dac67e | 1333 | panic("union: unlocking other process's union node"); |
a1fa407d JSP |
1334 | #endif |
1335 | ||
a1fa407d | 1336 | un->un_flags &= ~UN_LOCKED; |
e2a2f3a7 JSP |
1337 | |
1338 | if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK) | |
1339 | VOP_UNLOCK(un->un_uppervp); | |
1340 | ||
1341 | un->un_flags &= ~(UN_ULOCK|UN_KLOCK); | |
1342 | ||
a1fa407d JSP |
1343 | if (un->un_flags & UN_WANT) { |
1344 | un->un_flags &= ~UN_WANT; | |
1345 | wakeup((caddr_t) &un->un_flags); | |
1346 | } | |
1347 | ||
1348 | #ifdef DIAGNOSTIC | |
1349 | un->un_pid = 0; | |
1350 | #endif | |
15a86f7e JSP |
1351 | |
1352 | return (0); | |
a1fa407d JSP |
1353 | } |
1354 | ||
12abe7b1 JSP |
1355 | int |
1356 | union_bmap(ap) | |
1357 | struct vop_bmap_args /* { | |
1358 | struct vnode *a_vp; | |
1359 | daddr_t a_bn; | |
1360 | struct vnode **a_vpp; | |
1361 | daddr_t *a_bnp; | |
1362 | int *a_runp; | |
1363 | } */ *ap; | |
1364 | { | |
1365 | int error; | |
1366 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1367 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1368 | |
e2a2f3a7 JSP |
1369 | if (dolock) |
1370 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1371 | else |
1372 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1373 | error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp); |
e2a2f3a7 JSP |
1374 | if (dolock) |
1375 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1376 | |
1377 | return (error); | |
1378 | } | |
1379 | ||
1380 | int | |
1381 | union_print(ap) | |
1382 | struct vop_print_args /* { | |
1383 | struct vnode *a_vp; | |
1384 | } */ *ap; | |
1385 | { | |
1386 | struct vnode *vp = ap->a_vp; | |
1387 | ||
1388 | printf("\ttag VT_UNION, vp=%x, uppervp=%x, lowervp=%x\n", | |
1389 | vp, UPPERVP(vp), LOWERVP(vp)); | |
1390 | return (0); | |
1391 | } | |
1392 | ||
1393 | int | |
1394 | union_islocked(ap) | |
1395 | struct vop_islocked_args /* { | |
1396 | struct vnode *a_vp; | |
1397 | } */ *ap; | |
1398 | { | |
1399 | ||
1400 | return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); | |
1401 | } | |
1402 | ||
1403 | int | |
1404 | union_pathconf(ap) | |
1405 | struct vop_pathconf_args /* { | |
1406 | struct vnode *a_vp; | |
1407 | int a_name; | |
1408 | int *a_retval; | |
1409 | } */ *ap; | |
1410 | { | |
1411 | int error; | |
1412 | struct vnode *vp = OTHERVP(ap->a_vp); | |
e2a2f3a7 | 1413 | int dolock = (vp == LOWERVP(ap->a_vp)); |
12abe7b1 | 1414 | |
e2a2f3a7 JSP |
1415 | if (dolock) |
1416 | VOP_LOCK(vp); | |
c1b204a8 JSP |
1417 | else |
1418 | FIXUP(VTOUNION(ap->a_vp)); | |
12abe7b1 | 1419 | error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval); |
e2a2f3a7 JSP |
1420 | if (dolock) |
1421 | VOP_UNLOCK(vp); | |
12abe7b1 JSP |
1422 | |
1423 | return (error); | |
1424 | } | |
1425 | ||
1426 | int | |
1427 | union_advlock(ap) | |
1428 | struct vop_advlock_args /* { | |
1429 | struct vnode *a_vp; | |
1430 | caddr_t a_id; | |
1431 | int a_op; | |
1432 | struct flock *a_fl; | |
1433 | int a_flags; | |
1434 | } */ *ap; | |
1435 | { | |
1436 | ||
1437 | return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op, | |
1438 | ap->a_fl, ap->a_flags)); | |
1439 | } | |
1440 | ||
1441 | ||
a1fa407d | 1442 | /* |
12abe7b1 JSP |
1443 | * XXX - vop_strategy must be hand coded because it has no |
1444 | * vnode in its arguments. | |
1445 | * This goes away with a merged VM/buffer cache. | |
a1fa407d | 1446 | */ |
12abe7b1 JSP |
1447 | int |
1448 | union_strategy(ap) | |
1449 | struct vop_strategy_args /* { | |
1450 | struct buf *a_bp; | |
1451 | } */ *ap; | |
1452 | { | |
1453 | struct buf *bp = ap->a_bp; | |
1454 | int error; | |
1455 | struct vnode *savedvp; | |
1456 | ||
1457 | savedvp = bp->b_vp; | |
1458 | bp->b_vp = OTHERVP(bp->b_vp); | |
a1fa407d | 1459 | |
12abe7b1 | 1460 | #ifdef DIAGNOSTIC |
3b293975 | 1461 | if (bp->b_vp == NULLVP) |
12abe7b1 JSP |
1462 | panic("union_strategy: nil vp"); |
1463 | if (((bp->b_flags & B_READ) == 0) && | |
1464 | (bp->b_vp == LOWERVP(savedvp))) | |
1465 | panic("union_strategy: writing to lowervp"); | |
1466 | #endif | |
a1fa407d | 1467 | |
12abe7b1 JSP |
1468 | error = VOP_STRATEGY(bp); |
1469 | bp->b_vp = savedvp; | |
a1fa407d | 1470 | |
12abe7b1 JSP |
1471 | return (error); |
1472 | } | |
a1fa407d | 1473 | |
12abe7b1 JSP |
1474 | /* |
1475 | * Global vfs data structures | |
1476 | */ | |
1477 | int (**union_vnodeop_p)(); | |
01dac67e | 1478 | struct vnodeopv_entry_desc union_vnodeop_entries[] = { |
12abe7b1 JSP |
1479 | { &vop_default_desc, vn_default_error }, |
1480 | { &vop_lookup_desc, union_lookup }, /* lookup */ | |
1481 | { &vop_create_desc, union_create }, /* create */ | |
88edbcd4 | 1482 | { &vop_whiteout_desc, union_whiteout }, /* whiteout */ |
12abe7b1 JSP |
1483 | { &vop_mknod_desc, union_mknod }, /* mknod */ |
1484 | { &vop_open_desc, union_open }, /* open */ | |
1485 | { &vop_close_desc, union_close }, /* close */ | |
1486 | { &vop_access_desc, union_access }, /* access */ | |
1487 | { &vop_getattr_desc, union_getattr }, /* getattr */ | |
1488 | { &vop_setattr_desc, union_setattr }, /* setattr */ | |
1489 | { &vop_read_desc, union_read }, /* read */ | |
1490 | { &vop_write_desc, union_write }, /* write */ | |
1491 | { &vop_ioctl_desc, union_ioctl }, /* ioctl */ | |
1492 | { &vop_select_desc, union_select }, /* select */ | |
1493 | { &vop_mmap_desc, union_mmap }, /* mmap */ | |
1494 | { &vop_fsync_desc, union_fsync }, /* fsync */ | |
1495 | { &vop_seek_desc, union_seek }, /* seek */ | |
1496 | { &vop_remove_desc, union_remove }, /* remove */ | |
1497 | { &vop_link_desc, union_link }, /* link */ | |
1498 | { &vop_rename_desc, union_rename }, /* rename */ | |
1499 | { &vop_mkdir_desc, union_mkdir }, /* mkdir */ | |
1500 | { &vop_rmdir_desc, union_rmdir }, /* rmdir */ | |
1501 | { &vop_symlink_desc, union_symlink }, /* symlink */ | |
1502 | { &vop_readdir_desc, union_readdir }, /* readdir */ | |
1503 | { &vop_readlink_desc, union_readlink }, /* readlink */ | |
1504 | { &vop_abortop_desc, union_abortop }, /* abortop */ | |
1505 | { &vop_inactive_desc, union_inactive }, /* inactive */ | |
1506 | { &vop_reclaim_desc, union_reclaim }, /* reclaim */ | |
1507 | { &vop_lock_desc, union_lock }, /* lock */ | |
1508 | { &vop_unlock_desc, union_unlock }, /* unlock */ | |
1509 | { &vop_bmap_desc, union_bmap }, /* bmap */ | |
1510 | { &vop_strategy_desc, union_strategy }, /* strategy */ | |
1511 | { &vop_print_desc, union_print }, /* print */ | |
1512 | { &vop_islocked_desc, union_islocked }, /* islocked */ | |
1513 | { &vop_pathconf_desc, union_pathconf }, /* pathconf */ | |
1514 | { &vop_advlock_desc, union_advlock }, /* advlock */ | |
1515 | #ifdef notdef | |
1516 | { &vop_blkatoff_desc, union_blkatoff }, /* blkatoff */ | |
1517 | { &vop_valloc_desc, union_valloc }, /* valloc */ | |
1518 | { &vop_vfree_desc, union_vfree }, /* vfree */ | |
1519 | { &vop_truncate_desc, union_truncate }, /* truncate */ | |
1520 | { &vop_update_desc, union_update }, /* update */ | |
1521 | { &vop_bwrite_desc, union_bwrite }, /* bwrite */ | |
1522 | #endif | |
a1fa407d JSP |
1523 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } |
1524 | }; | |
1525 | struct vnodeopv_desc union_vnodeop_opv_desc = | |
1526 | { &union_vnodeop_p, union_vnodeop_entries }; |