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; | |
a47afb0f | 54 | inp->ih.pgid = task_pgrp_nr(current); |
1da177e4 LT |
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 | ||
1da177e4 | 163 | int venus_close(struct super_block *sb, struct CodaFid *fid, int flags, |
d3fec424 | 164 | vuid_t uid) |
1da177e4 LT |
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(release); | |
175 | UPARG(CODA_CLOSE); | |
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_close.VFid = *fid; | |
184 | inp->coda_close.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_open(struct super_block *sb, struct CodaFid *fid, | |
193 | int flags, struct file **fh) | |
194 | { | |
195 | union inputArgs *inp; | |
196 | union outputArgs *outp; | |
197 | int insize, outsize, error; | |
198 | ||
199 | insize = SIZE(open_by_fd); | |
200 | UPARG(CODA_OPEN_BY_FD); | |
201 | ||
38c2e437 JH |
202 | inp->coda_open_by_fd.VFid = *fid; |
203 | inp->coda_open_by_fd.flags = flags; | |
1da177e4 | 204 | |
a1b0aa87 | 205 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
38c2e437 JH |
206 | if (!error) |
207 | *fh = outp->coda_open_by_fd.fh; | |
1da177e4 LT |
208 | |
209 | CODA_FREE(inp, insize); | |
210 | return error; | |
211 | } | |
212 | ||
213 | int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid, | |
214 | const char *name, int length, | |
215 | struct CodaFid *newfid, struct coda_vattr *attrs) | |
216 | { | |
217 | union inputArgs *inp; | |
218 | union outputArgs *outp; | |
219 | int insize, outsize, error; | |
220 | int offset; | |
221 | ||
222 | offset = INSIZE(mkdir); | |
223 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir)); | |
224 | UPARG(CODA_MKDIR); | |
225 | ||
226 | inp->coda_mkdir.VFid = *dirfid; | |
227 | inp->coda_mkdir.attr = *attrs; | |
228 | inp->coda_mkdir.name = offset; | |
229 | /* Venus must get null terminated string */ | |
230 | memcpy((char *)(inp) + offset, name, length); | |
231 | *((char *)inp + offset + length) = '\0'; | |
1da177e4 | 232 | |
a1b0aa87 | 233 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
234 | if (!error) { |
235 | *attrs = outp->coda_mkdir.attr; | |
236 | *newfid = outp->coda_mkdir.VFid; | |
237 | } | |
1da177e4 LT |
238 | |
239 | CODA_FREE(inp, insize); | |
240 | return error; | |
241 | } | |
242 | ||
243 | ||
244 | int venus_rename(struct super_block *sb, struct CodaFid *old_fid, | |
245 | struct CodaFid *new_fid, size_t old_length, | |
246 | size_t new_length, const char *old_name, | |
247 | const char *new_name) | |
248 | { | |
249 | union inputArgs *inp; | |
250 | union outputArgs *outp; | |
251 | int insize, outsize, error; | |
252 | int offset, s; | |
253 | ||
254 | offset = INSIZE(rename); | |
255 | insize = max_t(unsigned int, offset + new_length + old_length + 8, | |
256 | OUTSIZE(rename)); | |
257 | UPARG(CODA_RENAME); | |
258 | ||
259 | inp->coda_rename.sourceFid = *old_fid; | |
260 | inp->coda_rename.destFid = *new_fid; | |
261 | inp->coda_rename.srcname = offset; | |
262 | ||
263 | /* Venus must receive an null terminated string */ | |
264 | s = ( old_length & ~0x3) +4; /* round up to word boundary */ | |
265 | memcpy((char *)(inp) + offset, old_name, old_length); | |
266 | *((char *)inp + offset + old_length) = '\0'; | |
267 | ||
268 | /* another null terminated string for Venus */ | |
269 | offset += s; | |
270 | inp->coda_rename.destname = offset; | |
271 | s = ( new_length & ~0x3) +4; /* round up to word boundary */ | |
272 | memcpy((char *)(inp) + offset, new_name, new_length); | |
273 | *((char *)inp + offset + new_length) = '\0'; | |
274 | ||
a1b0aa87 | 275 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
276 | |
277 | CODA_FREE(inp, insize); | |
278 | return error; | |
279 | } | |
280 | ||
281 | int venus_create(struct super_block *sb, struct CodaFid *dirfid, | |
282 | const char *name, int length, int excl, int mode, | |
283 | struct CodaFid *newfid, struct coda_vattr *attrs) | |
284 | { | |
285 | union inputArgs *inp; | |
286 | union outputArgs *outp; | |
287 | int insize, outsize, error; | |
288 | int offset; | |
289 | ||
290 | offset = INSIZE(create); | |
291 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create)); | |
292 | UPARG(CODA_CREATE); | |
293 | ||
294 | inp->coda_create.VFid = *dirfid; | |
295 | inp->coda_create.attr.va_mode = mode; | |
296 | inp->coda_create.excl = excl; | |
297 | inp->coda_create.mode = mode; | |
298 | inp->coda_create.name = offset; | |
299 | ||
300 | /* Venus must get null terminated string */ | |
301 | memcpy((char *)(inp) + offset, name, length); | |
302 | *((char *)inp + offset + length) = '\0'; | |
1da177e4 | 303 | |
a1b0aa87 | 304 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
305 | if (!error) { |
306 | *attrs = outp->coda_create.attr; | |
307 | *newfid = outp->coda_create.VFid; | |
308 | } | |
1da177e4 LT |
309 | |
310 | CODA_FREE(inp, insize); | |
311 | return error; | |
312 | } | |
313 | ||
314 | int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid, | |
315 | const char *name, int length) | |
316 | { | |
317 | union inputArgs *inp; | |
318 | union outputArgs *outp; | |
319 | int insize, outsize, error; | |
320 | int offset; | |
321 | ||
322 | offset = INSIZE(rmdir); | |
323 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir)); | |
324 | UPARG(CODA_RMDIR); | |
325 | ||
326 | inp->coda_rmdir.VFid = *dirfid; | |
327 | inp->coda_rmdir.name = offset; | |
328 | memcpy((char *)(inp) + offset, name, length); | |
329 | *((char *)inp + offset + length) = '\0'; | |
a1b0aa87 JH |
330 | |
331 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
332 | |
333 | CODA_FREE(inp, insize); | |
334 | return error; | |
335 | } | |
336 | ||
337 | int venus_remove(struct super_block *sb, struct CodaFid *dirfid, | |
338 | const char *name, int length) | |
339 | { | |
340 | union inputArgs *inp; | |
341 | union outputArgs *outp; | |
342 | int error=0, insize, outsize, offset; | |
343 | ||
344 | offset = INSIZE(remove); | |
345 | insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove)); | |
346 | UPARG(CODA_REMOVE); | |
347 | ||
348 | inp->coda_remove.VFid = *dirfid; | |
349 | inp->coda_remove.name = offset; | |
350 | memcpy((char *)(inp) + offset, name, length); | |
351 | *((char *)inp + offset + length) = '\0'; | |
a1b0aa87 JH |
352 | |
353 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
354 | |
355 | CODA_FREE(inp, insize); | |
356 | return error; | |
357 | } | |
358 | ||
359 | int venus_readlink(struct super_block *sb, struct CodaFid *fid, | |
360 | char *buffer, int *length) | |
361 | { | |
362 | union inputArgs *inp; | |
363 | union outputArgs *outp; | |
364 | int insize, outsize, error; | |
365 | int retlen; | |
366 | char *result; | |
367 | ||
368 | insize = max_t(unsigned int, | |
369 | INSIZE(readlink), OUTSIZE(readlink)+ *length + 1); | |
370 | UPARG(CODA_READLINK); | |
371 | ||
372 | inp->coda_readlink.VFid = *fid; | |
970648eb | 373 | |
a1b0aa87 | 374 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
375 | if (!error) { |
376 | retlen = outp->coda_readlink.count; | |
1da177e4 | 377 | if ( retlen > *length ) |
970648eb | 378 | retlen = *length; |
1da177e4 LT |
379 | *length = retlen; |
380 | result = (char *)outp + (long)outp->coda_readlink.data; | |
381 | memcpy(buffer, result, retlen); | |
382 | *(buffer + retlen) = '\0'; | |
383 | } | |
970648eb | 384 | |
1da177e4 LT |
385 | CODA_FREE(inp, insize); |
386 | return error; | |
387 | } | |
388 | ||
389 | ||
390 | ||
391 | int venus_link(struct super_block *sb, struct CodaFid *fid, | |
392 | struct CodaFid *dirfid, const char *name, int len ) | |
393 | { | |
394 | union inputArgs *inp; | |
395 | union outputArgs *outp; | |
396 | int insize, outsize, error; | |
397 | int offset; | |
398 | ||
399 | offset = INSIZE(link); | |
400 | insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link)); | |
401 | UPARG(CODA_LINK); | |
402 | ||
403 | inp->coda_link.sourceFid = *fid; | |
404 | inp->coda_link.destFid = *dirfid; | |
405 | inp->coda_link.tname = offset; | |
406 | ||
407 | /* make sure strings are null terminated */ | |
408 | memcpy((char *)(inp) + offset, name, len); | |
409 | *((char *)inp + offset + len) = '\0'; | |
a1b0aa87 JH |
410 | |
411 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
412 | |
413 | CODA_FREE(inp, insize); | |
414 | return error; | |
415 | } | |
416 | ||
417 | int venus_symlink(struct super_block *sb, struct CodaFid *fid, | |
418 | const char *name, int len, | |
419 | const char *symname, int symlen) | |
420 | { | |
421 | union inputArgs *inp; | |
422 | union outputArgs *outp; | |
423 | int insize, outsize, error; | |
424 | int offset, s; | |
425 | ||
426 | offset = INSIZE(symlink); | |
427 | insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink)); | |
428 | UPARG(CODA_SYMLINK); | |
429 | ||
430 | /* inp->coda_symlink.attr = *tva; XXXXXX */ | |
431 | inp->coda_symlink.VFid = *fid; | |
432 | ||
433 | /* Round up to word boundary and null terminate */ | |
434 | inp->coda_symlink.srcname = offset; | |
435 | s = ( symlen & ~0x3 ) + 4; | |
436 | memcpy((char *)(inp) + offset, symname, symlen); | |
437 | *((char *)inp + offset + symlen) = '\0'; | |
438 | ||
439 | /* Round up to word boundary and null terminate */ | |
440 | offset += s; | |
441 | inp->coda_symlink.tname = offset; | |
442 | s = (len & ~0x3) + 4; | |
443 | memcpy((char *)(inp) + offset, name, len); | |
444 | *((char *)inp + offset + len) = '\0'; | |
445 | ||
a1b0aa87 | 446 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
447 | |
448 | CODA_FREE(inp, insize); | |
449 | return error; | |
450 | } | |
451 | ||
452 | int venus_fsync(struct super_block *sb, struct CodaFid *fid) | |
453 | { | |
454 | union inputArgs *inp; | |
455 | union outputArgs *outp; | |
456 | int insize, outsize, error; | |
457 | ||
458 | insize=SIZE(fsync); | |
459 | UPARG(CODA_FSYNC); | |
460 | ||
a1b0aa87 JH |
461 | inp->coda_fsync.VFid = *fid; |
462 | error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs), | |
463 | &outsize, inp); | |
1da177e4 LT |
464 | |
465 | CODA_FREE(inp, insize); | |
466 | return error; | |
467 | } | |
468 | ||
469 | int venus_access(struct super_block *sb, struct CodaFid *fid, int mask) | |
470 | { | |
471 | union inputArgs *inp; | |
472 | union outputArgs *outp; | |
473 | int insize, outsize, error; | |
474 | ||
475 | insize = SIZE(access); | |
476 | UPARG(CODA_ACCESS); | |
477 | ||
478 | inp->coda_access.VFid = *fid; | |
479 | inp->coda_access.flags = mask; | |
480 | ||
a1b0aa87 | 481 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
482 | |
483 | CODA_FREE(inp, insize); | |
484 | return error; | |
485 | } | |
486 | ||
487 | ||
488 | int venus_pioctl(struct super_block *sb, struct CodaFid *fid, | |
489 | unsigned int cmd, struct PioctlData *data) | |
490 | { | |
491 | union inputArgs *inp; | |
492 | union outputArgs *outp; | |
493 | int insize, outsize, error; | |
494 | int iocsize; | |
495 | ||
496 | insize = VC_MAXMSGSIZE; | |
497 | UPARG(CODA_IOCTL); | |
498 | ||
499 | /* build packet for Venus */ | |
500 | if (data->vi.in_size > VC_MAXDATASIZE) { | |
501 | error = -EINVAL; | |
502 | goto exit; | |
503 | } | |
504 | ||
505 | if (data->vi.out_size > VC_MAXDATASIZE) { | |
506 | error = -EINVAL; | |
507 | goto exit; | |
508 | } | |
509 | ||
510 | inp->coda_ioctl.VFid = *fid; | |
511 | ||
512 | /* the cmd field was mutated by increasing its size field to | |
513 | * reflect the path and follow args. We need to subtract that | |
514 | * out before sending the command to Venus. */ | |
515 | inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16)); | |
516 | iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int); | |
517 | inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16; | |
518 | ||
519 | /* in->coda_ioctl.rwflag = flag; */ | |
520 | inp->coda_ioctl.len = data->vi.in_size; | |
521 | inp->coda_ioctl.data = (char *)(INSIZE(ioctl)); | |
522 | ||
523 | /* get the data out of user space */ | |
524 | if ( copy_from_user((char*)inp + (long)inp->coda_ioctl.data, | |
525 | data->vi.in, data->vi.in_size) ) { | |
526 | error = -EINVAL; | |
527 | goto exit; | |
528 | } | |
529 | ||
a1b0aa87 JH |
530 | error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size, |
531 | &outsize, inp); | |
532 | ||
1da177e4 LT |
533 | if (error) { |
534 | printk("coda_pioctl: Venus returns: %d for %s\n", | |
535 | error, coda_f2s(fid)); | |
536 | goto exit; | |
537 | } | |
538 | ||
539 | if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) { | |
540 | error = -EINVAL; | |
541 | goto exit; | |
542 | } | |
543 | ||
544 | /* Copy out the OUT buffer. */ | |
545 | if (outp->coda_ioctl.len > data->vi.out_size) { | |
546 | error = -EINVAL; | |
547 | goto exit; | |
548 | } | |
549 | ||
550 | /* Copy out the OUT buffer. */ | |
551 | if (copy_to_user(data->vi.out, | |
552 | (char *)outp + (long)outp->coda_ioctl.data, | |
553 | outp->coda_ioctl.len)) { | |
554 | error = -EFAULT; | |
555 | goto exit; | |
556 | } | |
557 | ||
558 | exit: | |
559 | CODA_FREE(inp, insize); | |
560 | return error; | |
561 | } | |
562 | ||
726c3342 | 563 | int venus_statfs(struct dentry *dentry, struct kstatfs *sfs) |
1da177e4 LT |
564 | { |
565 | union inputArgs *inp; | |
566 | union outputArgs *outp; | |
567 | int insize, outsize, error; | |
568 | ||
569 | insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs)); | |
570 | UPARG(CODA_STATFS); | |
571 | ||
a1b0aa87 | 572 | error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp); |
970648eb | 573 | if (!error) { |
1da177e4 LT |
574 | sfs->f_blocks = outp->coda_statfs.stat.f_blocks; |
575 | sfs->f_bfree = outp->coda_statfs.stat.f_bfree; | |
576 | sfs->f_bavail = outp->coda_statfs.stat.f_bavail; | |
577 | sfs->f_files = outp->coda_statfs.stat.f_files; | |
578 | sfs->f_ffree = outp->coda_statfs.stat.f_ffree; | |
1da177e4 LT |
579 | } |
580 | ||
581 | CODA_FREE(inp, insize); | |
582 | return error; | |
583 | } | |
584 | ||
585 | /* | |
586 | * coda_upcall and coda_downcall routines. | |
1da177e4 | 587 | */ |
5f47c7ea | 588 | static void coda_block_signals(sigset_t *old) |
d9664c95 JH |
589 | { |
590 | spin_lock_irq(¤t->sighand->siglock); | |
591 | *old = current->blocked; | |
592 | ||
593 | sigfillset(¤t->blocked); | |
594 | sigdelset(¤t->blocked, SIGKILL); | |
595 | sigdelset(¤t->blocked, SIGSTOP); | |
596 | sigdelset(¤t->blocked, SIGINT); | |
597 | ||
598 | recalc_sigpending(); | |
599 | spin_unlock_irq(¤t->sighand->siglock); | |
600 | } | |
601 | ||
5f47c7ea | 602 | static void coda_unblock_signals(sigset_t *old) |
d9664c95 JH |
603 | { |
604 | spin_lock_irq(¤t->sighand->siglock); | |
605 | current->blocked = *old; | |
606 | recalc_sigpending(); | |
607 | spin_unlock_irq(¤t->sighand->siglock); | |
608 | } | |
609 | ||
610 | /* Don't allow signals to interrupt the following upcalls before venus | |
611 | * has seen them, | |
612 | * - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems) | |
613 | * - CODA_STORE (to avoid data loss) | |
614 | */ | |
615 | #define CODA_INTERRUPTIBLE(r) (!coda_hard && \ | |
616 | (((r)->uc_opcode != CODA_CLOSE && \ | |
617 | (r)->uc_opcode != CODA_STORE && \ | |
618 | (r)->uc_opcode != CODA_RELEASE) || \ | |
619 | (r)->uc_flags & REQ_READ)) | |
1da177e4 | 620 | |
d9664c95 | 621 | static inline void coda_waitfor_upcall(struct upc_req *req) |
1da177e4 LT |
622 | { |
623 | DECLARE_WAITQUEUE(wait, current); | |
d9664c95 JH |
624 | unsigned long timeout = jiffies + coda_timeout * HZ; |
625 | sigset_t old; | |
626 | int blocked; | |
1da177e4 | 627 | |
5f47c7ea | 628 | coda_block_signals(&old); |
d9664c95 | 629 | blocked = 1; |
1da177e4 | 630 | |
d9664c95 | 631 | add_wait_queue(&req->uc_sleep, &wait); |
1da177e4 | 632 | for (;;) { |
d9664c95 | 633 | if (CODA_INTERRUPTIBLE(req)) |
1da177e4 LT |
634 | set_current_state(TASK_INTERRUPTIBLE); |
635 | else | |
636 | set_current_state(TASK_UNINTERRUPTIBLE); | |
637 | ||
1da177e4 | 638 | /* got a reply */ |
d9664c95 | 639 | if (req->uc_flags & (REQ_WRITE | REQ_ABORT)) |
1da177e4 LT |
640 | break; |
641 | ||
d9664c95 JH |
642 | if (blocked && time_after(jiffies, timeout) && |
643 | CODA_INTERRUPTIBLE(req)) | |
644 | { | |
5f47c7ea | 645 | coda_unblock_signals(&old); |
d9664c95 | 646 | blocked = 0; |
1da177e4 | 647 | } |
d9664c95 JH |
648 | |
649 | if (signal_pending(current)) { | |
650 | list_del(&req->uc_chain); | |
651 | break; | |
652 | } | |
653 | ||
654 | if (blocked) | |
655 | schedule_timeout(HZ); | |
656 | else | |
657 | schedule(); | |
1da177e4 | 658 | } |
d9664c95 | 659 | if (blocked) |
5f47c7ea | 660 | coda_unblock_signals(&old); |
1da177e4 | 661 | |
d9664c95 JH |
662 | remove_wait_queue(&req->uc_sleep, &wait); |
663 | set_current_state(TASK_RUNNING); | |
1da177e4 LT |
664 | } |
665 | ||
666 | ||
a1b0aa87 JH |
667 | /* |
668 | * coda_upcall will return an error in the case of | |
1da177e4 LT |
669 | * failed communication with Venus _or_ will peek at Venus |
670 | * reply and return Venus' error. | |
671 | * | |
672 | * As venus has 2 types of errors, normal errors (positive) and internal | |
673 | * errors (negative), normal errors are negated, while internal errors | |
674 | * are all mapped to -EINTR, while showing a nice warning message. (jh) | |
1da177e4 | 675 | */ |
a1b0aa87 | 676 | static int coda_upcall(struct venus_comm *vcp, |
fe71b5f3 JH |
677 | int inSize, int *outSize, |
678 | union inputArgs *buffer) | |
1da177e4 | 679 | { |
1da177e4 | 680 | union outputArgs *out; |
fe71b5f3 JH |
681 | union inputArgs *sig_inputArgs; |
682 | struct upc_req *req, *sig_req; | |
1da177e4 LT |
683 | int error = 0; |
684 | ||
a1b0aa87 | 685 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
686 | printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n"); |
687 | return -ENXIO; | |
1da177e4 LT |
688 | } |
689 | ||
690 | /* Format the request message. */ | |
37461e19 | 691 | req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 | 692 | if (!req) |
1da177e4 | 693 | return -ENOMEM; |
fe71b5f3 | 694 | |
1da177e4 LT |
695 | req->uc_data = (void *)buffer; |
696 | req->uc_flags = 0; | |
697 | req->uc_inSize = inSize; | |
698 | req->uc_outSize = *outSize ? *outSize : inSize; | |
699 | req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode; | |
a1b0aa87 | 700 | req->uc_unique = ++vcp->vc_seq; |
1da177e4 | 701 | init_waitqueue_head(&req->uc_sleep); |
fe71b5f3 | 702 | |
1da177e4 LT |
703 | /* Fill in the common input args. */ |
704 | ((union inputArgs *)buffer)->ih.unique = req->uc_unique; | |
705 | ||
706 | /* Append msg to pending queue and poke Venus. */ | |
a1b0aa87 | 707 | list_add_tail(&req->uc_chain, &vcp->vc_pending); |
fe71b5f3 | 708 | |
a1b0aa87 | 709 | wake_up_interruptible(&vcp->vc_waitq); |
1da177e4 LT |
710 | /* We can be interrupted while we wait for Venus to process |
711 | * our request. If the interrupt occurs before Venus has read | |
712 | * the request, we dequeue and return. If it occurs after the | |
713 | * read but before the reply, we dequeue, send a signal | |
714 | * message, and return. If it occurs after the reply we ignore | |
715 | * it. In no case do we want to restart the syscall. If it | |
716 | * was interrupted by a venus shutdown (psdev_close), return | |
717 | * ENODEV. */ | |
718 | ||
719 | /* Go to sleep. Wake up on signals only after the timeout. */ | |
87065519 | 720 | coda_waitfor_upcall(req); |
1da177e4 | 721 | |
fe71b5f3 JH |
722 | /* Op went through, interrupt or not... */ |
723 | if (req->uc_flags & REQ_WRITE) { | |
1da177e4 LT |
724 | out = (union outputArgs *)req->uc_data; |
725 | /* here we map positive Venus errors to kernel errors */ | |
726 | error = -out->oh.result; | |
727 | *outSize = req->uc_outSize; | |
728 | goto exit; | |
fe71b5f3 JH |
729 | } |
730 | ||
731 | error = -EINTR; | |
732 | if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) { | |
733 | printk(KERN_WARNING "coda: Unexpected interruption.\n"); | |
1da177e4 | 734 | goto exit; |
1da177e4 LT |
735 | } |
736 | ||
fe71b5f3 JH |
737 | /* Interrupted before venus read it. */ |
738 | if (!(req->uc_flags & REQ_READ)) | |
739 | goto exit; | |
740 | ||
741 | /* Venus saw the upcall, make sure we can send interrupt signal */ | |
a1b0aa87 | 742 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
743 | printk(KERN_INFO "coda: Venus dead, not sending signal.\n"); |
744 | goto exit; | |
745 | } | |
746 | ||
747 | error = -ENOMEM; | |
37461e19 | 748 | sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 JH |
749 | if (!sig_req) goto exit; |
750 | ||
751 | CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr)); | |
752 | if (!sig_req->uc_data) { | |
37461e19 | 753 | kfree(sig_req); |
fe71b5f3 JH |
754 | goto exit; |
755 | } | |
756 | ||
757 | error = -EINTR; | |
758 | sig_inputArgs = (union inputArgs *)sig_req->uc_data; | |
759 | sig_inputArgs->ih.opcode = CODA_SIGNAL; | |
760 | sig_inputArgs->ih.unique = req->uc_unique; | |
761 | ||
762 | sig_req->uc_flags = REQ_ASYNC; | |
763 | sig_req->uc_opcode = sig_inputArgs->ih.opcode; | |
764 | sig_req->uc_unique = sig_inputArgs->ih.unique; | |
765 | sig_req->uc_inSize = sizeof(struct coda_in_hdr); | |
766 | sig_req->uc_outSize = sizeof(struct coda_in_hdr); | |
767 | ||
768 | /* insert at head of queue! */ | |
a1b0aa87 JH |
769 | list_add(&(sig_req->uc_chain), &vcp->vc_pending); |
770 | wake_up_interruptible(&vcp->vc_waitq); | |
fe71b5f3 JH |
771 | |
772 | exit: | |
37461e19 | 773 | kfree(req); |
1da177e4 LT |
774 | return error; |
775 | } | |
776 | ||
777 | /* | |
778 | The statements below are part of the Coda opportunistic | |
779 | programming -- taken from the Mach/BSD kernel code for Coda. | |
780 | You don't get correct semantics by stating what needs to be | |
781 | done without guaranteeing the invariants needed for it to happen. | |
782 | When will be have time to find out what exactly is going on? (pjb) | |
783 | */ | |
784 | ||
785 | ||
786 | /* | |
787 | * There are 7 cases where cache invalidations occur. The semantics | |
788 | * of each is listed here: | |
789 | * | |
790 | * CODA_FLUSH -- flush all entries from the name cache and the cnode cache. | |
791 | * CODA_PURGEUSER -- flush all entries from the name cache for a specific user | |
792 | * This call is a result of token expiration. | |
793 | * | |
794 | * The next arise as the result of callbacks on a file or directory. | |
795 | * CODA_ZAPFILE -- flush the cached attributes for a file. | |
796 | ||
797 | * CODA_ZAPDIR -- flush the attributes for the dir and | |
798 | * force a new lookup for all the children | |
799 | of this dir. | |
800 | ||
801 | * | |
802 | * The next is a result of Venus detecting an inconsistent file. | |
803 | * CODA_PURGEFID -- flush the attribute for the file | |
804 | * purge it and its children from the dcache | |
805 | * | |
806 | * The last allows Venus to replace local fids with global ones | |
807 | * during reintegration. | |
808 | * | |
809 | * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */ | |
810 | ||
811 | int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb) | |
812 | { | |
5fd31e9a JH |
813 | struct inode *inode = NULL; |
814 | struct CodaFid *fid, *newfid; | |
815 | ||
1da177e4 | 816 | /* Handle invalidation requests. */ |
5fd31e9a JH |
817 | if ( !sb || !sb->s_root) |
818 | return 0; | |
819 | ||
820 | switch (opcode) { | |
821 | case CODA_FLUSH: | |
822 | coda_cache_clear_all(sb); | |
823 | shrink_dcache_sb(sb); | |
824 | if (sb->s_root->d_inode) | |
825 | coda_flag_inode(sb->s_root->d_inode, C_FLUSH); | |
826 | break; | |
827 | ||
828 | case CODA_PURGEUSER: | |
829 | coda_cache_clear_all(sb); | |
830 | break; | |
831 | ||
832 | case CODA_ZAPDIR: | |
833 | fid = &out->coda_zapdir.CodaFid; | |
834 | inode = coda_fid_to_inode(fid, sb); | |
835 | if (inode) { | |
836 | coda_flag_inode_children(inode, C_PURGE); | |
837 | coda_flag_inode(inode, C_VATTR); | |
838 | } | |
839 | break; | |
840 | ||
841 | case CODA_ZAPFILE: | |
842 | fid = &out->coda_zapfile.CodaFid; | |
843 | inode = coda_fid_to_inode(fid, sb); | |
844 | if (inode) | |
845 | coda_flag_inode(inode, C_VATTR); | |
846 | break; | |
847 | ||
848 | case CODA_PURGEFID: | |
849 | fid = &out->coda_purgefid.CodaFid; | |
850 | inode = coda_fid_to_inode(fid, sb); | |
851 | if (inode) { | |
1da177e4 LT |
852 | coda_flag_inode_children(inode, C_PURGE); |
853 | ||
854 | /* catch the dentries later if some are still busy */ | |
855 | coda_flag_inode(inode, C_PURGE); | |
856 | d_prune_aliases(inode); | |
857 | ||
5fd31e9a JH |
858 | } |
859 | break; | |
860 | ||
861 | case CODA_REPLACE: | |
862 | fid = &out->coda_replace.OldFid; | |
863 | newfid = &out->coda_replace.NewFid; | |
864 | inode = coda_fid_to_inode(fid, sb); | |
865 | if (inode) | |
866 | coda_replace_fid(inode, fid, newfid); | |
867 | break; | |
868 | } | |
869 | ||
870 | if (inode) | |
871 | iput(inode); | |
872 | ||
873 | return 0; | |
1da177e4 LT |
874 | } |
875 |