Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Mostly platform independent upcall operations to Venus: | |
3 | * -- upcalls | |
4 | * -- upcall routines | |
5 | * | |
6 | * Linux 2.0 version | |
7 | * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>, | |
8 | * Michael Callahan <callahan@maths.ox.ac.uk> | |
9 | * | |
10 | * Redone for Linux 2.1 | |
11 | * Copyright (C) 1997 Carnegie Mellon University | |
12 | * | |
13 | * Carnegie Mellon University encourages users of this code to contribute | |
14 | * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. | |
15 | */ | |
16 | ||
17 | #include <asm/system.h> | |
18 | #include <linux/signal.h> | |
e8edc6e0 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/file.h> | |
26 | #include <linux/stat.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/vfs.h> | |
32 | ||
33 | #include <linux/coda.h> | |
34 | #include <linux/coda_linux.h> | |
35 | #include <linux/coda_psdev.h> | |
36 | #include <linux/coda_fs_i.h> | |
37 | #include <linux/coda_cache.h> | |
3cf01f28 JH |
38 | |
39 | #include "coda_int.h" | |
1da177e4 | 40 | |
a1b0aa87 | 41 | static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize, |
1da177e4 LT |
42 | union inputArgs *buffer); |
43 | ||
44 | static void *alloc_upcall(int opcode, int size) | |
45 | { | |
46 | union inputArgs *inp; | |
47 | ||
48 | CODA_ALLOC(inp, union inputArgs *, size); | |
49 | if (!inp) | |
50 | return ERR_PTR(-ENOMEM); | |
51 | ||
52 | inp->ih.opcode = opcode; | |
53 | inp->ih.pid = current->pid; | |
54 | inp->ih.pgid = process_group(current); | |
55 | #ifdef CONFIG_CODA_FS_OLD_API | |
56 | memset(&inp->ih.cred, 0, sizeof(struct coda_cred)); | |
57 | inp->ih.cred.cr_fsuid = current->fsuid; | |
58 | #else | |
59 | inp->ih.uid = current->fsuid; | |
60 | #endif | |
61 | return (void*)inp; | |
62 | } | |
63 | ||
64 | #define UPARG(op)\ | |
65 | do {\ | |
66 | inp = (union inputArgs *)alloc_upcall(op, insize); \ | |
67 | if (IS_ERR(inp)) { return PTR_ERR(inp); }\ | |
68 | outp = (union outputArgs *)(inp); \ | |
69 | outsize = insize; \ | |
70 | } while (0) | |
71 | ||
72 | #define INSIZE(tag) sizeof(struct coda_ ## tag ## _in) | |
73 | #define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out) | |
74 | #define SIZE(tag) max_t(unsigned int, INSIZE(tag), OUTSIZE(tag)) | |
75 | ||
76 | ||
77 | /* the upcalls */ | |
78 | int venus_rootfid(struct super_block *sb, struct CodaFid *fidp) | |
79 | { | |
80 | union inputArgs *inp; | |
81 | union outputArgs *outp; | |
82 | int insize, outsize, error; | |
83 | ||
84 | insize = SIZE(root); | |
85 | UPARG(CODA_ROOT); | |
86 | ||
a1b0aa87 | 87 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb | 88 | if (!error) |
1da177e4 | 89 | *fidp = outp->coda_root.VFid; |
1da177e4 LT |
90 | |
91 | CODA_FREE(inp, insize); | |
92 | return error; | |
93 | } | |
94 | ||
95 | int venus_getattr(struct super_block *sb, struct CodaFid *fid, | |
96 | struct coda_vattr *attr) | |
97 | { | |
98 | union inputArgs *inp; | |
99 | union outputArgs *outp; | |
100 | int insize, outsize, error; | |
101 | ||
102 | insize = SIZE(getattr); | |
103 | UPARG(CODA_GETATTR); | |
104 | inp->coda_getattr.VFid = *fid; | |
105 | ||
a1b0aa87 | 106 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
107 | if (!error) |
108 | *attr = outp->coda_getattr.attr; | |
1da177e4 LT |
109 | |
110 | CODA_FREE(inp, insize); | |
111 | return error; | |
112 | } | |
113 | ||
114 | int venus_setattr(struct super_block *sb, struct CodaFid *fid, | |
115 | struct coda_vattr *vattr) | |
116 | { | |
117 | union inputArgs *inp; | |
118 | union outputArgs *outp; | |
119 | int insize, outsize, error; | |
120 | ||
121 | insize = SIZE(setattr); | |
122 | UPARG(CODA_SETATTR); | |
123 | ||
124 | inp->coda_setattr.VFid = *fid; | |
125 | inp->coda_setattr.attr = *vattr; | |
126 | ||
a1b0aa87 | 127 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
128 | |
129 | CODA_FREE(inp, insize); | |
130 | return error; | |
131 | } | |
132 | ||
133 | int venus_lookup(struct super_block *sb, struct CodaFid *fid, | |
134 | const char *name, int length, int * type, | |
135 | struct CodaFid *resfid) | |
136 | { | |
137 | union inputArgs *inp; | |
138 | union outputArgs *outp; | |
139 | int insize, outsize, error; | |
140 | int offset; | |
141 | ||
142 | offset = INSIZE(lookup); | |
143 | insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup)); | |
144 | UPARG(CODA_LOOKUP); | |
145 | ||
146 | inp->coda_lookup.VFid = *fid; | |
147 | inp->coda_lookup.name = offset; | |
148 | inp->coda_lookup.flags = CLU_CASE_SENSITIVE; | |
149 | /* send Venus a null terminated string */ | |
150 | memcpy((char *)(inp) + offset, name, length); | |
151 | *((char *)inp + offset + length) = '\0'; | |
152 | ||
a1b0aa87 | 153 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
154 | if (!error) { |
155 | *resfid = outp->coda_lookup.VFid; | |
156 | *type = outp->coda_lookup.vtype; | |
157 | } | |
1da177e4 LT |
158 | |
159 | CODA_FREE(inp, insize); | |
160 | return error; | |
161 | } | |
162 | ||
163 | int venus_store(struct super_block *sb, struct CodaFid *fid, int flags, | |
164 | vuid_t uid) | |
165 | { | |
166 | union inputArgs *inp; | |
167 | union outputArgs *outp; | |
168 | int insize, outsize, error; | |
169 | #ifdef CONFIG_CODA_FS_OLD_API | |
170 | struct coda_cred cred = { 0, }; | |
171 | cred.cr_fsuid = uid; | |
172 | #endif | |
173 | ||
174 | insize = SIZE(store); | |
175 | UPARG(CODA_STORE); | |
176 | ||
177 | #ifdef CONFIG_CODA_FS_OLD_API | |
178 | memcpy(&(inp->ih.cred), &cred, sizeof(cred)); | |
179 | #else | |
180 | inp->ih.uid = uid; | |
181 | #endif | |
182 | ||
183 | inp->coda_store.VFid = *fid; | |
184 | inp->coda_store.flags = flags; | |
185 | ||
a1b0aa87 | 186 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
187 | |
188 | CODA_FREE(inp, insize); | |
189 | return error; | |
190 | } | |
191 | ||
192 | int venus_release(struct super_block *sb, struct CodaFid *fid, int flags) | |
193 | { | |
194 | union inputArgs *inp; | |
195 | union outputArgs *outp; | |
196 | int insize, outsize, error; | |
197 | ||
198 | insize = SIZE(release); | |
199 | UPARG(CODA_RELEASE); | |
200 | ||
201 | inp->coda_release.VFid = *fid; | |
202 | inp->coda_release.flags = flags; | |
203 | ||
a1b0aa87 | 204 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
205 | |
206 | CODA_FREE(inp, insize); | |
207 | return error; | |
208 | } | |
209 | ||
210 | int venus_close(struct super_block *sb, struct CodaFid *fid, int flags, | |
211 | vuid_t uid) | |
212 | { | |
213 | union inputArgs *inp; | |
214 | union outputArgs *outp; | |
215 | int insize, outsize, error; | |
216 | #ifdef CONFIG_CODA_FS_OLD_API | |
217 | struct coda_cred cred = { 0, }; | |
218 | cred.cr_fsuid = uid; | |
219 | #endif | |
220 | ||
221 | insize = SIZE(release); | |
222 | UPARG(CODA_CLOSE); | |
223 | ||
224 | #ifdef CONFIG_CODA_FS_OLD_API | |
225 | memcpy(&(inp->ih.cred), &cred, sizeof(cred)); | |
226 | #else | |
227 | inp->ih.uid = uid; | |
228 | #endif | |
229 | ||
230 | inp->coda_close.VFid = *fid; | |
231 | inp->coda_close.flags = flags; | |
232 | ||
a1b0aa87 | 233 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
234 | |
235 | CODA_FREE(inp, insize); | |
236 | return error; | |
237 | } | |
238 | ||
239 | int venus_open(struct super_block *sb, struct CodaFid *fid, | |
240 | int flags, struct file **fh) | |
241 | { | |
242 | union inputArgs *inp; | |
243 | union outputArgs *outp; | |
244 | int insize, outsize, error; | |
245 | ||
246 | insize = SIZE(open_by_fd); | |
247 | UPARG(CODA_OPEN_BY_FD); | |
248 | ||
38c2e437 JH |
249 | inp->coda_open_by_fd.VFid = *fid; |
250 | inp->coda_open_by_fd.flags = flags; | |
1da177e4 | 251 | |
a1b0aa87 | 252 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
38c2e437 JH |
253 | if (!error) |
254 | *fh = outp->coda_open_by_fd.fh; | |
1da177e4 LT |
255 | |
256 | CODA_FREE(inp, insize); | |
257 | return error; | |
258 | } | |
259 | ||
260 | int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid, | |
261 | const char *name, int length, | |
262 | struct CodaFid *newfid, struct coda_vattr *attrs) | |
263 | { | |
264 | union inputArgs *inp; | |
265 | union outputArgs *outp; | |
266 | int insize, outsize, error; | |
267 | int offset; | |
268 | ||
269 | offset = INSIZE(mkdir); | |
270 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir)); | |
271 | UPARG(CODA_MKDIR); | |
272 | ||
273 | inp->coda_mkdir.VFid = *dirfid; | |
274 | inp->coda_mkdir.attr = *attrs; | |
275 | inp->coda_mkdir.name = offset; | |
276 | /* Venus must get null terminated string */ | |
277 | memcpy((char *)(inp) + offset, name, length); | |
278 | *((char *)inp + offset + length) = '\0'; | |
1da177e4 | 279 | |
a1b0aa87 | 280 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
281 | if (!error) { |
282 | *attrs = outp->coda_mkdir.attr; | |
283 | *newfid = outp->coda_mkdir.VFid; | |
284 | } | |
1da177e4 LT |
285 | |
286 | CODA_FREE(inp, insize); | |
287 | return error; | |
288 | } | |
289 | ||
290 | ||
291 | int venus_rename(struct super_block *sb, struct CodaFid *old_fid, | |
292 | struct CodaFid *new_fid, size_t old_length, | |
293 | size_t new_length, const char *old_name, | |
294 | const char *new_name) | |
295 | { | |
296 | union inputArgs *inp; | |
297 | union outputArgs *outp; | |
298 | int insize, outsize, error; | |
299 | int offset, s; | |
300 | ||
301 | offset = INSIZE(rename); | |
302 | insize = max_t(unsigned int, offset + new_length + old_length + 8, | |
303 | OUTSIZE(rename)); | |
304 | UPARG(CODA_RENAME); | |
305 | ||
306 | inp->coda_rename.sourceFid = *old_fid; | |
307 | inp->coda_rename.destFid = *new_fid; | |
308 | inp->coda_rename.srcname = offset; | |
309 | ||
310 | /* Venus must receive an null terminated string */ | |
311 | s = ( old_length & ~0x3) +4; /* round up to word boundary */ | |
312 | memcpy((char *)(inp) + offset, old_name, old_length); | |
313 | *((char *)inp + offset + old_length) = '\0'; | |
314 | ||
315 | /* another null terminated string for Venus */ | |
316 | offset += s; | |
317 | inp->coda_rename.destname = offset; | |
318 | s = ( new_length & ~0x3) +4; /* round up to word boundary */ | |
319 | memcpy((char *)(inp) + offset, new_name, new_length); | |
320 | *((char *)inp + offset + new_length) = '\0'; | |
321 | ||
a1b0aa87 | 322 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
323 | |
324 | CODA_FREE(inp, insize); | |
325 | return error; | |
326 | } | |
327 | ||
328 | int venus_create(struct super_block *sb, struct CodaFid *dirfid, | |
329 | const char *name, int length, int excl, int mode, | |
330 | struct CodaFid *newfid, struct coda_vattr *attrs) | |
331 | { | |
332 | union inputArgs *inp; | |
333 | union outputArgs *outp; | |
334 | int insize, outsize, error; | |
335 | int offset; | |
336 | ||
337 | offset = INSIZE(create); | |
338 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create)); | |
339 | UPARG(CODA_CREATE); | |
340 | ||
341 | inp->coda_create.VFid = *dirfid; | |
342 | inp->coda_create.attr.va_mode = mode; | |
343 | inp->coda_create.excl = excl; | |
344 | inp->coda_create.mode = mode; | |
345 | inp->coda_create.name = offset; | |
346 | ||
347 | /* Venus must get null terminated string */ | |
348 | memcpy((char *)(inp) + offset, name, length); | |
349 | *((char *)inp + offset + length) = '\0'; | |
1da177e4 | 350 | |
a1b0aa87 | 351 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
352 | if (!error) { |
353 | *attrs = outp->coda_create.attr; | |
354 | *newfid = outp->coda_create.VFid; | |
355 | } | |
1da177e4 LT |
356 | |
357 | CODA_FREE(inp, insize); | |
358 | return error; | |
359 | } | |
360 | ||
361 | int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid, | |
362 | const char *name, int length) | |
363 | { | |
364 | union inputArgs *inp; | |
365 | union outputArgs *outp; | |
366 | int insize, outsize, error; | |
367 | int offset; | |
368 | ||
369 | offset = INSIZE(rmdir); | |
370 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir)); | |
371 | UPARG(CODA_RMDIR); | |
372 | ||
373 | inp->coda_rmdir.VFid = *dirfid; | |
374 | inp->coda_rmdir.name = offset; | |
375 | memcpy((char *)(inp) + offset, name, length); | |
376 | *((char *)inp + offset + length) = '\0'; | |
a1b0aa87 JH |
377 | |
378 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
379 | |
380 | CODA_FREE(inp, insize); | |
381 | return error; | |
382 | } | |
383 | ||
384 | int venus_remove(struct super_block *sb, struct CodaFid *dirfid, | |
385 | const char *name, int length) | |
386 | { | |
387 | union inputArgs *inp; | |
388 | union outputArgs *outp; | |
389 | int error=0, insize, outsize, offset; | |
390 | ||
391 | offset = INSIZE(remove); | |
392 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove)); | |
393 | UPARG(CODA_REMOVE); | |
394 | ||
395 | inp->coda_remove.VFid = *dirfid; | |
396 | inp->coda_remove.name = offset; | |
397 | memcpy((char *)(inp) + offset, name, length); | |
398 | *((char *)inp + offset + length) = '\0'; | |
a1b0aa87 JH |
399 | |
400 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
401 | |
402 | CODA_FREE(inp, insize); | |
403 | return error; | |
404 | } | |
405 | ||
406 | int venus_readlink(struct super_block *sb, struct CodaFid *fid, | |
407 | char *buffer, int *length) | |
408 | { | |
409 | union inputArgs *inp; | |
410 | union outputArgs *outp; | |
411 | int insize, outsize, error; | |
412 | int retlen; | |
413 | char *result; | |
414 | ||
415 | insize = max_t(unsigned int, | |
416 | INSIZE(readlink), OUTSIZE(readlink)+ *length + 1); | |
417 | UPARG(CODA_READLINK); | |
418 | ||
419 | inp->coda_readlink.VFid = *fid; | |
970648eb | 420 | |
a1b0aa87 | 421 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
422 | if (!error) { |
423 | retlen = outp->coda_readlink.count; | |
1da177e4 | 424 | if ( retlen > *length ) |
970648eb | 425 | retlen = *length; |
1da177e4 LT |
426 | *length = retlen; |
427 | result = (char *)outp + (long)outp->coda_readlink.data; | |
428 | memcpy(buffer, result, retlen); | |
429 | *(buffer + retlen) = '\0'; | |
430 | } | |
970648eb | 431 | |
1da177e4 LT |
432 | CODA_FREE(inp, insize); |
433 | return error; | |
434 | } | |
435 | ||
436 | ||
437 | ||
438 | int venus_link(struct super_block *sb, struct CodaFid *fid, | |
439 | struct CodaFid *dirfid, const char *name, int len ) | |
440 | { | |
441 | union inputArgs *inp; | |
442 | union outputArgs *outp; | |
443 | int insize, outsize, error; | |
444 | int offset; | |
445 | ||
446 | offset = INSIZE(link); | |
447 | insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link)); | |
448 | UPARG(CODA_LINK); | |
449 | ||
450 | inp->coda_link.sourceFid = *fid; | |
451 | inp->coda_link.destFid = *dirfid; | |
452 | inp->coda_link.tname = offset; | |
453 | ||
454 | /* make sure strings are null terminated */ | |
455 | memcpy((char *)(inp) + offset, name, len); | |
456 | *((char *)inp + offset + len) = '\0'; | |
a1b0aa87 JH |
457 | |
458 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
459 | |
460 | CODA_FREE(inp, insize); | |
461 | return error; | |
462 | } | |
463 | ||
464 | int venus_symlink(struct super_block *sb, struct CodaFid *fid, | |
465 | const char *name, int len, | |
466 | const char *symname, int symlen) | |
467 | { | |
468 | union inputArgs *inp; | |
469 | union outputArgs *outp; | |
470 | int insize, outsize, error; | |
471 | int offset, s; | |
472 | ||
473 | offset = INSIZE(symlink); | |
474 | insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink)); | |
475 | UPARG(CODA_SYMLINK); | |
476 | ||
477 | /* inp->coda_symlink.attr = *tva; XXXXXX */ | |
478 | inp->coda_symlink.VFid = *fid; | |
479 | ||
480 | /* Round up to word boundary and null terminate */ | |
481 | inp->coda_symlink.srcname = offset; | |
482 | s = ( symlen & ~0x3 ) + 4; | |
483 | memcpy((char *)(inp) + offset, symname, symlen); | |
484 | *((char *)inp + offset + symlen) = '\0'; | |
485 | ||
486 | /* Round up to word boundary and null terminate */ | |
487 | offset += s; | |
488 | inp->coda_symlink.tname = offset; | |
489 | s = (len & ~0x3) + 4; | |
490 | memcpy((char *)(inp) + offset, name, len); | |
491 | *((char *)inp + offset + len) = '\0'; | |
492 | ||
a1b0aa87 | 493 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
494 | |
495 | CODA_FREE(inp, insize); | |
496 | return error; | |
497 | } | |
498 | ||
499 | int venus_fsync(struct super_block *sb, struct CodaFid *fid) | |
500 | { | |
501 | union inputArgs *inp; | |
502 | union outputArgs *outp; | |
503 | int insize, outsize, error; | |
504 | ||
505 | insize=SIZE(fsync); | |
506 | UPARG(CODA_FSYNC); | |
507 | ||
a1b0aa87 JH |
508 | inp->coda_fsync.VFid = *fid; |
509 | error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs), | |
510 | &outsize, inp); | |
1da177e4 LT |
511 | |
512 | CODA_FREE(inp, insize); | |
513 | return error; | |
514 | } | |
515 | ||
516 | int venus_access(struct super_block *sb, struct CodaFid *fid, int mask) | |
517 | { | |
518 | union inputArgs *inp; | |
519 | union outputArgs *outp; | |
520 | int insize, outsize, error; | |
521 | ||
522 | insize = SIZE(access); | |
523 | UPARG(CODA_ACCESS); | |
524 | ||
525 | inp->coda_access.VFid = *fid; | |
526 | inp->coda_access.flags = mask; | |
527 | ||
a1b0aa87 | 528 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
529 | |
530 | CODA_FREE(inp, insize); | |
531 | return error; | |
532 | } | |
533 | ||
534 | ||
535 | int venus_pioctl(struct super_block *sb, struct CodaFid *fid, | |
536 | unsigned int cmd, struct PioctlData *data) | |
537 | { | |
538 | union inputArgs *inp; | |
539 | union outputArgs *outp; | |
540 | int insize, outsize, error; | |
541 | int iocsize; | |
542 | ||
543 | insize = VC_MAXMSGSIZE; | |
544 | UPARG(CODA_IOCTL); | |
545 | ||
546 | /* build packet for Venus */ | |
547 | if (data->vi.in_size > VC_MAXDATASIZE) { | |
548 | error = -EINVAL; | |
549 | goto exit; | |
550 | } | |
551 | ||
552 | if (data->vi.out_size > VC_MAXDATASIZE) { | |
553 | error = -EINVAL; | |
554 | goto exit; | |
555 | } | |
556 | ||
557 | inp->coda_ioctl.VFid = *fid; | |
558 | ||
559 | /* the cmd field was mutated by increasing its size field to | |
560 | * reflect the path and follow args. We need to subtract that | |
561 | * out before sending the command to Venus. */ | |
562 | inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16)); | |
563 | iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int); | |
564 | inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16; | |
565 | ||
566 | /* in->coda_ioctl.rwflag = flag; */ | |
567 | inp->coda_ioctl.len = data->vi.in_size; | |
568 | inp->coda_ioctl.data = (char *)(INSIZE(ioctl)); | |
569 | ||
570 | /* get the data out of user space */ | |
571 | if ( copy_from_user((char*)inp + (long)inp->coda_ioctl.data, | |
572 | data->vi.in, data->vi.in_size) ) { | |
573 | error = -EINVAL; | |
574 | goto exit; | |
575 | } | |
576 | ||
a1b0aa87 JH |
577 | error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size, |
578 | &outsize, inp); | |
579 | ||
1da177e4 LT |
580 | if (error) { |
581 | printk("coda_pioctl: Venus returns: %d for %s\n", | |
582 | error, coda_f2s(fid)); | |
583 | goto exit; | |
584 | } | |
585 | ||
586 | if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) { | |
587 | error = -EINVAL; | |
588 | goto exit; | |
589 | } | |
590 | ||
591 | /* Copy out the OUT buffer. */ | |
592 | if (outp->coda_ioctl.len > data->vi.out_size) { | |
593 | error = -EINVAL; | |
594 | goto exit; | |
595 | } | |
596 | ||
597 | /* Copy out the OUT buffer. */ | |
598 | if (copy_to_user(data->vi.out, | |
599 | (char *)outp + (long)outp->coda_ioctl.data, | |
600 | outp->coda_ioctl.len)) { | |
601 | error = -EFAULT; | |
602 | goto exit; | |
603 | } | |
604 | ||
605 | exit: | |
606 | CODA_FREE(inp, insize); | |
607 | return error; | |
608 | } | |
609 | ||
726c3342 | 610 | int venus_statfs(struct dentry *dentry, struct kstatfs *sfs) |
1da177e4 LT |
611 | { |
612 | union inputArgs *inp; | |
613 | union outputArgs *outp; | |
614 | int insize, outsize, error; | |
615 | ||
616 | insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs)); | |
617 | UPARG(CODA_STATFS); | |
618 | ||
a1b0aa87 | 619 | error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp); |
970648eb | 620 | if (!error) { |
1da177e4 LT |
621 | sfs->f_blocks = outp->coda_statfs.stat.f_blocks; |
622 | sfs->f_bfree = outp->coda_statfs.stat.f_bfree; | |
623 | sfs->f_bavail = outp->coda_statfs.stat.f_bavail; | |
624 | sfs->f_files = outp->coda_statfs.stat.f_files; | |
625 | sfs->f_ffree = outp->coda_statfs.stat.f_ffree; | |
1da177e4 LT |
626 | } |
627 | ||
628 | CODA_FREE(inp, insize); | |
629 | return error; | |
630 | } | |
631 | ||
632 | /* | |
633 | * coda_upcall and coda_downcall routines. | |
1da177e4 | 634 | */ |
5f47c7ea | 635 | static void coda_block_signals(sigset_t *old) |
d9664c95 JH |
636 | { |
637 | spin_lock_irq(¤t->sighand->siglock); | |
638 | *old = current->blocked; | |
639 | ||
640 | sigfillset(¤t->blocked); | |
641 | sigdelset(¤t->blocked, SIGKILL); | |
642 | sigdelset(¤t->blocked, SIGSTOP); | |
643 | sigdelset(¤t->blocked, SIGINT); | |
644 | ||
645 | recalc_sigpending(); | |
646 | spin_unlock_irq(¤t->sighand->siglock); | |
647 | } | |
648 | ||
5f47c7ea | 649 | static void coda_unblock_signals(sigset_t *old) |
d9664c95 JH |
650 | { |
651 | spin_lock_irq(¤t->sighand->siglock); | |
652 | current->blocked = *old; | |
653 | recalc_sigpending(); | |
654 | spin_unlock_irq(¤t->sighand->siglock); | |
655 | } | |
656 | ||
657 | /* Don't allow signals to interrupt the following upcalls before venus | |
658 | * has seen them, | |
659 | * - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems) | |
660 | * - CODA_STORE (to avoid data loss) | |
661 | */ | |
662 | #define CODA_INTERRUPTIBLE(r) (!coda_hard && \ | |
663 | (((r)->uc_opcode != CODA_CLOSE && \ | |
664 | (r)->uc_opcode != CODA_STORE && \ | |
665 | (r)->uc_opcode != CODA_RELEASE) || \ | |
666 | (r)->uc_flags & REQ_READ)) | |
1da177e4 | 667 | |
d9664c95 | 668 | static inline void coda_waitfor_upcall(struct upc_req *req) |
1da177e4 LT |
669 | { |
670 | DECLARE_WAITQUEUE(wait, current); | |
d9664c95 JH |
671 | unsigned long timeout = jiffies + coda_timeout * HZ; |
672 | sigset_t old; | |
673 | int blocked; | |
1da177e4 | 674 | |
5f47c7ea | 675 | coda_block_signals(&old); |
d9664c95 | 676 | blocked = 1; |
1da177e4 | 677 | |
d9664c95 | 678 | add_wait_queue(&req->uc_sleep, &wait); |
1da177e4 | 679 | for (;;) { |
d9664c95 | 680 | if (CODA_INTERRUPTIBLE(req)) |
1da177e4 LT |
681 | set_current_state(TASK_INTERRUPTIBLE); |
682 | else | |
683 | set_current_state(TASK_UNINTERRUPTIBLE); | |
684 | ||
1da177e4 | 685 | /* got a reply */ |
d9664c95 | 686 | if (req->uc_flags & (REQ_WRITE | REQ_ABORT)) |
1da177e4 LT |
687 | break; |
688 | ||
d9664c95 JH |
689 | if (blocked && time_after(jiffies, timeout) && |
690 | CODA_INTERRUPTIBLE(req)) | |
691 | { | |
5f47c7ea | 692 | coda_unblock_signals(&old); |
d9664c95 | 693 | blocked = 0; |
1da177e4 | 694 | } |
d9664c95 JH |
695 | |
696 | if (signal_pending(current)) { | |
697 | list_del(&req->uc_chain); | |
698 | break; | |
699 | } | |
700 | ||
701 | if (blocked) | |
702 | schedule_timeout(HZ); | |
703 | else | |
704 | schedule(); | |
1da177e4 | 705 | } |
d9664c95 | 706 | if (blocked) |
5f47c7ea | 707 | coda_unblock_signals(&old); |
1da177e4 | 708 | |
d9664c95 JH |
709 | remove_wait_queue(&req->uc_sleep, &wait); |
710 | set_current_state(TASK_RUNNING); | |
1da177e4 LT |
711 | } |
712 | ||
713 | ||
a1b0aa87 JH |
714 | /* |
715 | * coda_upcall will return an error in the case of | |
1da177e4 LT |
716 | * failed communication with Venus _or_ will peek at Venus |
717 | * reply and return Venus' error. | |
718 | * | |
719 | * As venus has 2 types of errors, normal errors (positive) and internal | |
720 | * errors (negative), normal errors are negated, while internal errors | |
721 | * are all mapped to -EINTR, while showing a nice warning message. (jh) | |
1da177e4 | 722 | */ |
a1b0aa87 | 723 | static int coda_upcall(struct venus_comm *vcp, |
fe71b5f3 JH |
724 | int inSize, int *outSize, |
725 | union inputArgs *buffer) | |
1da177e4 | 726 | { |
1da177e4 | 727 | union outputArgs *out; |
fe71b5f3 JH |
728 | union inputArgs *sig_inputArgs; |
729 | struct upc_req *req, *sig_req; | |
1da177e4 LT |
730 | int error = 0; |
731 | ||
a1b0aa87 | 732 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
733 | printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n"); |
734 | return -ENXIO; | |
1da177e4 LT |
735 | } |
736 | ||
737 | /* Format the request message. */ | |
37461e19 | 738 | req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 | 739 | if (!req) |
1da177e4 | 740 | return -ENOMEM; |
fe71b5f3 | 741 | |
1da177e4 LT |
742 | req->uc_data = (void *)buffer; |
743 | req->uc_flags = 0; | |
744 | req->uc_inSize = inSize; | |
745 | req->uc_outSize = *outSize ? *outSize : inSize; | |
746 | req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode; | |
a1b0aa87 | 747 | req->uc_unique = ++vcp->vc_seq; |
1da177e4 | 748 | init_waitqueue_head(&req->uc_sleep); |
fe71b5f3 | 749 | |
1da177e4 LT |
750 | /* Fill in the common input args. */ |
751 | ((union inputArgs *)buffer)->ih.unique = req->uc_unique; | |
752 | ||
753 | /* Append msg to pending queue and poke Venus. */ | |
a1b0aa87 | 754 | list_add_tail(&req->uc_chain, &vcp->vc_pending); |
fe71b5f3 | 755 | |
a1b0aa87 | 756 | wake_up_interruptible(&vcp->vc_waitq); |
1da177e4 LT |
757 | /* We can be interrupted while we wait for Venus to process |
758 | * our request. If the interrupt occurs before Venus has read | |
759 | * the request, we dequeue and return. If it occurs after the | |
760 | * read but before the reply, we dequeue, send a signal | |
761 | * message, and return. If it occurs after the reply we ignore | |
762 | * it. In no case do we want to restart the syscall. If it | |
763 | * was interrupted by a venus shutdown (psdev_close), return | |
764 | * ENODEV. */ | |
765 | ||
766 | /* Go to sleep. Wake up on signals only after the timeout. */ | |
87065519 | 767 | coda_waitfor_upcall(req); |
1da177e4 | 768 | |
fe71b5f3 JH |
769 | /* Op went through, interrupt or not... */ |
770 | if (req->uc_flags & REQ_WRITE) { | |
1da177e4 LT |
771 | out = (union outputArgs *)req->uc_data; |
772 | /* here we map positive Venus errors to kernel errors */ | |
773 | error = -out->oh.result; | |
774 | *outSize = req->uc_outSize; | |
775 | goto exit; | |
fe71b5f3 JH |
776 | } |
777 | ||
778 | error = -EINTR; | |
779 | if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) { | |
780 | printk(KERN_WARNING "coda: Unexpected interruption.\n"); | |
1da177e4 | 781 | goto exit; |
1da177e4 LT |
782 | } |
783 | ||
fe71b5f3 JH |
784 | /* Interrupted before venus read it. */ |
785 | if (!(req->uc_flags & REQ_READ)) | |
786 | goto exit; | |
787 | ||
788 | /* Venus saw the upcall, make sure we can send interrupt signal */ | |
a1b0aa87 | 789 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
790 | printk(KERN_INFO "coda: Venus dead, not sending signal.\n"); |
791 | goto exit; | |
792 | } | |
793 | ||
794 | error = -ENOMEM; | |
37461e19 | 795 | sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 JH |
796 | if (!sig_req) goto exit; |
797 | ||
798 | CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr)); | |
799 | if (!sig_req->uc_data) { | |
37461e19 | 800 | kfree(sig_req); |
fe71b5f3 JH |
801 | goto exit; |
802 | } | |
803 | ||
804 | error = -EINTR; | |
805 | sig_inputArgs = (union inputArgs *)sig_req->uc_data; | |
806 | sig_inputArgs->ih.opcode = CODA_SIGNAL; | |
807 | sig_inputArgs->ih.unique = req->uc_unique; | |
808 | ||
809 | sig_req->uc_flags = REQ_ASYNC; | |
810 | sig_req->uc_opcode = sig_inputArgs->ih.opcode; | |
811 | sig_req->uc_unique = sig_inputArgs->ih.unique; | |
812 | sig_req->uc_inSize = sizeof(struct coda_in_hdr); | |
813 | sig_req->uc_outSize = sizeof(struct coda_in_hdr); | |
814 | ||
815 | /* insert at head of queue! */ | |
a1b0aa87 JH |
816 | list_add(&(sig_req->uc_chain), &vcp->vc_pending); |
817 | wake_up_interruptible(&vcp->vc_waitq); | |
fe71b5f3 JH |
818 | |
819 | exit: | |
37461e19 | 820 | kfree(req); |
1da177e4 LT |
821 | return error; |
822 | } | |
823 | ||
824 | /* | |
825 | The statements below are part of the Coda opportunistic | |
826 | programming -- taken from the Mach/BSD kernel code for Coda. | |
827 | You don't get correct semantics by stating what needs to be | |
828 | done without guaranteeing the invariants needed for it to happen. | |
829 | When will be have time to find out what exactly is going on? (pjb) | |
830 | */ | |
831 | ||
832 | ||
833 | /* | |
834 | * There are 7 cases where cache invalidations occur. The semantics | |
835 | * of each is listed here: | |
836 | * | |
837 | * CODA_FLUSH -- flush all entries from the name cache and the cnode cache. | |
838 | * CODA_PURGEUSER -- flush all entries from the name cache for a specific user | |
839 | * This call is a result of token expiration. | |
840 | * | |
841 | * The next arise as the result of callbacks on a file or directory. | |
842 | * CODA_ZAPFILE -- flush the cached attributes for a file. | |
843 | ||
844 | * CODA_ZAPDIR -- flush the attributes for the dir and | |
845 | * force a new lookup for all the children | |
846 | of this dir. | |
847 | ||
848 | * | |
849 | * The next is a result of Venus detecting an inconsistent file. | |
850 | * CODA_PURGEFID -- flush the attribute for the file | |
851 | * purge it and its children from the dcache | |
852 | * | |
853 | * The last allows Venus to replace local fids with global ones | |
854 | * during reintegration. | |
855 | * | |
856 | * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */ | |
857 | ||
858 | int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb) | |
859 | { | |
5fd31e9a JH |
860 | struct inode *inode = NULL; |
861 | struct CodaFid *fid, *newfid; | |
862 | ||
1da177e4 | 863 | /* Handle invalidation requests. */ |
5fd31e9a JH |
864 | if ( !sb || !sb->s_root) |
865 | return 0; | |
866 | ||
867 | switch (opcode) { | |
868 | case CODA_FLUSH: | |
869 | coda_cache_clear_all(sb); | |
870 | shrink_dcache_sb(sb); | |
871 | if (sb->s_root->d_inode) | |
872 | coda_flag_inode(sb->s_root->d_inode, C_FLUSH); | |
873 | break; | |
874 | ||
875 | case CODA_PURGEUSER: | |
876 | coda_cache_clear_all(sb); | |
877 | break; | |
878 | ||
879 | case CODA_ZAPDIR: | |
880 | fid = &out->coda_zapdir.CodaFid; | |
881 | inode = coda_fid_to_inode(fid, sb); | |
882 | if (inode) { | |
883 | coda_flag_inode_children(inode, C_PURGE); | |
884 | coda_flag_inode(inode, C_VATTR); | |
885 | } | |
886 | break; | |
887 | ||
888 | case CODA_ZAPFILE: | |
889 | fid = &out->coda_zapfile.CodaFid; | |
890 | inode = coda_fid_to_inode(fid, sb); | |
891 | if (inode) | |
892 | coda_flag_inode(inode, C_VATTR); | |
893 | break; | |
894 | ||
895 | case CODA_PURGEFID: | |
896 | fid = &out->coda_purgefid.CodaFid; | |
897 | inode = coda_fid_to_inode(fid, sb); | |
898 | if (inode) { | |
1da177e4 LT |
899 | coda_flag_inode_children(inode, C_PURGE); |
900 | ||
901 | /* catch the dentries later if some are still busy */ | |
902 | coda_flag_inode(inode, C_PURGE); | |
903 | d_prune_aliases(inode); | |
904 | ||
5fd31e9a JH |
905 | } |
906 | break; | |
907 | ||
908 | case CODA_REPLACE: | |
909 | fid = &out->coda_replace.OldFid; | |
910 | newfid = &out->coda_replace.NewFid; | |
911 | inode = coda_fid_to_inode(fid, sb); | |
912 | if (inode) | |
913 | coda_replace_fid(inode, fid, newfid); | |
914 | break; | |
915 | } | |
916 | ||
917 | if (inode) | |
918 | iput(inode); | |
919 | ||
920 | return 0; | |
1da177e4 LT |
921 | } |
922 |