blob: 9727e0c525793354cee16b4ccb3df71598ddd843 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040019#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Yoshihisa Abeda47c192010-10-25 02:03:46 -040030#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/uaccess.h>
32#include <linux/vmalloc.h>
33#include <linux/vfs.h>
34
35#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050037#include "coda_linux.h"
38#include "coda_cache.h"
Jan Harkes3cf01f22007-07-19 01:48:51 -070039
40#include "coda_int.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Jan Harkesa1b0aa82007-07-19 01:48:50 -070042static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 union inputArgs *buffer);
44
45static void *alloc_upcall(int opcode, int size)
46{
47 union inputArgs *inp;
48
49 CODA_ALLOC(inp, union inputArgs *, size);
50 if (!inp)
51 return ERR_PTR(-ENOMEM);
52
53 inp->ih.opcode = opcode;
54 inp->ih.pid = current->pid;
Pavel Emelianova47afb02007-10-18 23:39:46 -070055 inp->ih.pgid = task_pgrp_nr(current);
David Howells97b77022008-11-14 10:38:48 +110056 inp->ih.uid = current_fsuid();
Adrian Bunkde0ca062008-07-25 01:46:34 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return (void*)inp;
59}
60
61#define UPARG(op)\
62do {\
63 inp = (union inputArgs *)alloc_upcall(op, insize); \
64 if (IS_ERR(inp)) { return PTR_ERR(inp); }\
65 outp = (union outputArgs *)(inp); \
66 outsize = insize; \
67} while (0)
68
69#define INSIZE(tag) sizeof(struct coda_ ## tag ## _in)
70#define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out)
71#define SIZE(tag) max_t(unsigned int, INSIZE(tag), OUTSIZE(tag))
72
73
74/* the upcalls */
75int venus_rootfid(struct super_block *sb, struct CodaFid *fidp)
76{
77 union inputArgs *inp;
78 union outputArgs *outp;
79 int insize, outsize, error;
80
81 insize = SIZE(root);
82 UPARG(CODA_ROOT);
83
Jan Harkesa1b0aa82007-07-19 01:48:50 -070084 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -070085 if (!error)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 *fidp = outp->coda_root.VFid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 CODA_FREE(inp, insize);
89 return error;
90}
91
92int venus_getattr(struct super_block *sb, struct CodaFid *fid,
93 struct coda_vattr *attr)
94{
95 union inputArgs *inp;
96 union outputArgs *outp;
97 int insize, outsize, error;
98
99 insize = SIZE(getattr);
100 UPARG(CODA_GETATTR);
101 inp->coda_getattr.VFid = *fid;
102
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700103 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700104 if (!error)
105 *attr = outp->coda_getattr.attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 CODA_FREE(inp, insize);
108 return error;
109}
110
111int venus_setattr(struct super_block *sb, struct CodaFid *fid,
112 struct coda_vattr *vattr)
113{
114 union inputArgs *inp;
115 union outputArgs *outp;
116 int insize, outsize, error;
117
118 insize = SIZE(setattr);
119 UPARG(CODA_SETATTR);
120
121 inp->coda_setattr.VFid = *fid;
122 inp->coda_setattr.attr = *vattr;
123
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700124 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 CODA_FREE(inp, insize);
127 return error;
128}
129
130int venus_lookup(struct super_block *sb, struct CodaFid *fid,
131 const char *name, int length, int * type,
132 struct CodaFid *resfid)
133{
134 union inputArgs *inp;
135 union outputArgs *outp;
136 int insize, outsize, error;
137 int offset;
138
139 offset = INSIZE(lookup);
140 insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup));
141 UPARG(CODA_LOOKUP);
142
143 inp->coda_lookup.VFid = *fid;
144 inp->coda_lookup.name = offset;
145 inp->coda_lookup.flags = CLU_CASE_SENSITIVE;
146 /* send Venus a null terminated string */
147 memcpy((char *)(inp) + offset, name, length);
148 *((char *)inp + offset + length) = '\0';
149
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700150 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700151 if (!error) {
152 *resfid = outp->coda_lookup.VFid;
153 *type = outp->coda_lookup.vtype;
154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 CODA_FREE(inp, insize);
157 return error;
158}
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
Jan Harkesd3fec422007-07-21 04:37:26 -0700161 vuid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 union inputArgs *inp;
164 union outputArgs *outp;
165 int insize, outsize, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 insize = SIZE(release);
168 UPARG(CODA_CLOSE);
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 inp->ih.uid = uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 inp->coda_close.VFid = *fid;
172 inp->coda_close.flags = flags;
173
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700174 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 CODA_FREE(inp, insize);
177 return error;
178}
179
180int venus_open(struct super_block *sb, struct CodaFid *fid,
181 int flags, struct file **fh)
182{
183 union inputArgs *inp;
184 union outputArgs *outp;
185 int insize, outsize, error;
186
187 insize = SIZE(open_by_fd);
188 UPARG(CODA_OPEN_BY_FD);
189
Jan Harkes38c2e432007-07-19 01:48:41 -0700190 inp->coda_open_by_fd.VFid = *fid;
191 inp->coda_open_by_fd.flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700193 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes38c2e432007-07-19 01:48:41 -0700194 if (!error)
195 *fh = outp->coda_open_by_fd.fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 CODA_FREE(inp, insize);
198 return error;
199}
200
201int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid,
202 const char *name, int length,
203 struct CodaFid *newfid, struct coda_vattr *attrs)
204{
205 union inputArgs *inp;
206 union outputArgs *outp;
207 int insize, outsize, error;
208 int offset;
209
210 offset = INSIZE(mkdir);
211 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir));
212 UPARG(CODA_MKDIR);
213
214 inp->coda_mkdir.VFid = *dirfid;
215 inp->coda_mkdir.attr = *attrs;
216 inp->coda_mkdir.name = offset;
217 /* Venus must get null terminated string */
218 memcpy((char *)(inp) + offset, name, length);
219 *((char *)inp + offset + length) = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700221 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700222 if (!error) {
223 *attrs = outp->coda_mkdir.attr;
224 *newfid = outp->coda_mkdir.VFid;
225 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 CODA_FREE(inp, insize);
228 return error;
229}
230
231
232int venus_rename(struct super_block *sb, struct CodaFid *old_fid,
233 struct CodaFid *new_fid, size_t old_length,
234 size_t new_length, const char *old_name,
235 const char *new_name)
236{
237 union inputArgs *inp;
238 union outputArgs *outp;
239 int insize, outsize, error;
240 int offset, s;
241
242 offset = INSIZE(rename);
243 insize = max_t(unsigned int, offset + new_length + old_length + 8,
244 OUTSIZE(rename));
245 UPARG(CODA_RENAME);
246
247 inp->coda_rename.sourceFid = *old_fid;
248 inp->coda_rename.destFid = *new_fid;
249 inp->coda_rename.srcname = offset;
250
251 /* Venus must receive an null terminated string */
252 s = ( old_length & ~0x3) +4; /* round up to word boundary */
253 memcpy((char *)(inp) + offset, old_name, old_length);
254 *((char *)inp + offset + old_length) = '\0';
255
256 /* another null terminated string for Venus */
257 offset += s;
258 inp->coda_rename.destname = offset;
259 s = ( new_length & ~0x3) +4; /* round up to word boundary */
260 memcpy((char *)(inp) + offset, new_name, new_length);
261 *((char *)inp + offset + new_length) = '\0';
262
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700263 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 CODA_FREE(inp, insize);
266 return error;
267}
268
269int venus_create(struct super_block *sb, struct CodaFid *dirfid,
270 const char *name, int length, int excl, int mode,
271 struct CodaFid *newfid, struct coda_vattr *attrs)
272{
273 union inputArgs *inp;
274 union outputArgs *outp;
275 int insize, outsize, error;
276 int offset;
277
278 offset = INSIZE(create);
279 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create));
280 UPARG(CODA_CREATE);
281
282 inp->coda_create.VFid = *dirfid;
283 inp->coda_create.attr.va_mode = mode;
284 inp->coda_create.excl = excl;
285 inp->coda_create.mode = mode;
286 inp->coda_create.name = offset;
287
288 /* Venus must get null terminated string */
289 memcpy((char *)(inp) + offset, name, length);
290 *((char *)inp + offset + length) = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700292 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700293 if (!error) {
294 *attrs = outp->coda_create.attr;
295 *newfid = outp->coda_create.VFid;
296 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 CODA_FREE(inp, insize);
299 return error;
300}
301
302int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid,
303 const char *name, int length)
304{
305 union inputArgs *inp;
306 union outputArgs *outp;
307 int insize, outsize, error;
308 int offset;
309
310 offset = INSIZE(rmdir);
311 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir));
312 UPARG(CODA_RMDIR);
313
314 inp->coda_rmdir.VFid = *dirfid;
315 inp->coda_rmdir.name = offset;
316 memcpy((char *)(inp) + offset, name, length);
317 *((char *)inp + offset + length) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700318
319 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 CODA_FREE(inp, insize);
322 return error;
323}
324
325int venus_remove(struct super_block *sb, struct CodaFid *dirfid,
326 const char *name, int length)
327{
328 union inputArgs *inp;
329 union outputArgs *outp;
330 int error=0, insize, outsize, offset;
331
332 offset = INSIZE(remove);
333 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove));
334 UPARG(CODA_REMOVE);
335
336 inp->coda_remove.VFid = *dirfid;
337 inp->coda_remove.name = offset;
338 memcpy((char *)(inp) + offset, name, length);
339 *((char *)inp + offset + length) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700340
341 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 CODA_FREE(inp, insize);
344 return error;
345}
346
347int venus_readlink(struct super_block *sb, struct CodaFid *fid,
348 char *buffer, int *length)
349{
350 union inputArgs *inp;
351 union outputArgs *outp;
352 int insize, outsize, error;
353 int retlen;
354 char *result;
355
356 insize = max_t(unsigned int,
357 INSIZE(readlink), OUTSIZE(readlink)+ *length + 1);
358 UPARG(CODA_READLINK);
359
360 inp->coda_readlink.VFid = *fid;
Jan Harkes970648e2007-07-19 01:48:48 -0700361
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700362 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700363 if (!error) {
364 retlen = outp->coda_readlink.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if ( retlen > *length )
Jan Harkes970648e2007-07-19 01:48:48 -0700366 retlen = *length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 *length = retlen;
368 result = (char *)outp + (long)outp->coda_readlink.data;
369 memcpy(buffer, result, retlen);
370 *(buffer + retlen) = '\0';
371 }
Jan Harkes970648e2007-07-19 01:48:48 -0700372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 CODA_FREE(inp, insize);
374 return error;
375}
376
377
378
379int venus_link(struct super_block *sb, struct CodaFid *fid,
380 struct CodaFid *dirfid, const char *name, int len )
381{
382 union inputArgs *inp;
383 union outputArgs *outp;
384 int insize, outsize, error;
385 int offset;
386
387 offset = INSIZE(link);
388 insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link));
389 UPARG(CODA_LINK);
390
391 inp->coda_link.sourceFid = *fid;
392 inp->coda_link.destFid = *dirfid;
393 inp->coda_link.tname = offset;
394
395 /* make sure strings are null terminated */
396 memcpy((char *)(inp) + offset, name, len);
397 *((char *)inp + offset + len) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700398
399 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 CODA_FREE(inp, insize);
402 return error;
403}
404
405int venus_symlink(struct super_block *sb, struct CodaFid *fid,
406 const char *name, int len,
407 const char *symname, int symlen)
408{
409 union inputArgs *inp;
410 union outputArgs *outp;
411 int insize, outsize, error;
412 int offset, s;
413
414 offset = INSIZE(symlink);
415 insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink));
416 UPARG(CODA_SYMLINK);
417
418 /* inp->coda_symlink.attr = *tva; XXXXXX */
419 inp->coda_symlink.VFid = *fid;
420
421 /* Round up to word boundary and null terminate */
422 inp->coda_symlink.srcname = offset;
423 s = ( symlen & ~0x3 ) + 4;
424 memcpy((char *)(inp) + offset, symname, symlen);
425 *((char *)inp + offset + symlen) = '\0';
426
427 /* Round up to word boundary and null terminate */
428 offset += s;
429 inp->coda_symlink.tname = offset;
430 s = (len & ~0x3) + 4;
431 memcpy((char *)(inp) + offset, name, len);
432 *((char *)inp + offset + len) = '\0';
433
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700434 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 CODA_FREE(inp, insize);
437 return error;
438}
439
440int venus_fsync(struct super_block *sb, struct CodaFid *fid)
441{
442 union inputArgs *inp;
443 union outputArgs *outp;
444 int insize, outsize, error;
445
446 insize=SIZE(fsync);
447 UPARG(CODA_FSYNC);
448
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700449 inp->coda_fsync.VFid = *fid;
450 error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs),
451 &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 CODA_FREE(inp, insize);
454 return error;
455}
456
457int venus_access(struct super_block *sb, struct CodaFid *fid, int mask)
458{
459 union inputArgs *inp;
460 union outputArgs *outp;
461 int insize, outsize, error;
462
463 insize = SIZE(access);
464 UPARG(CODA_ACCESS);
465
466 inp->coda_access.VFid = *fid;
467 inp->coda_access.flags = mask;
468
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700469 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471 CODA_FREE(inp, insize);
472 return error;
473}
474
475
476int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
477 unsigned int cmd, struct PioctlData *data)
478{
479 union inputArgs *inp;
480 union outputArgs *outp;
481 int insize, outsize, error;
482 int iocsize;
483
484 insize = VC_MAXMSGSIZE;
485 UPARG(CODA_IOCTL);
486
487 /* build packet for Venus */
488 if (data->vi.in_size > VC_MAXDATASIZE) {
489 error = -EINVAL;
490 goto exit;
491 }
492
493 if (data->vi.out_size > VC_MAXDATASIZE) {
494 error = -EINVAL;
495 goto exit;
496 }
497
498 inp->coda_ioctl.VFid = *fid;
499
500 /* the cmd field was mutated by increasing its size field to
501 * reflect the path and follow args. We need to subtract that
502 * out before sending the command to Venus. */
503 inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16));
504 iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int);
505 inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16;
506
507 /* in->coda_ioctl.rwflag = flag; */
508 inp->coda_ioctl.len = data->vi.in_size;
509 inp->coda_ioctl.data = (char *)(INSIZE(ioctl));
510
511 /* get the data out of user space */
512 if ( copy_from_user((char*)inp + (long)inp->coda_ioctl.data,
513 data->vi.in, data->vi.in_size) ) {
514 error = -EINVAL;
515 goto exit;
516 }
517
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700518 error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size,
519 &outsize, inp);
520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 if (error) {
522 printk("coda_pioctl: Venus returns: %d for %s\n",
523 error, coda_f2s(fid));
524 goto exit;
525 }
526
527 if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) {
528 error = -EINVAL;
529 goto exit;
530 }
531
532 /* Copy out the OUT buffer. */
533 if (outp->coda_ioctl.len > data->vi.out_size) {
534 error = -EINVAL;
535 goto exit;
536 }
537
538 /* Copy out the OUT buffer. */
539 if (copy_to_user(data->vi.out,
540 (char *)outp + (long)outp->coda_ioctl.data,
541 outp->coda_ioctl.len)) {
542 error = -EFAULT;
543 goto exit;
544 }
545
546 exit:
547 CODA_FREE(inp, insize);
548 return error;
549}
550
David Howells726c3342006-06-23 02:02:58 -0700551int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 union inputArgs *inp;
554 union outputArgs *outp;
555 int insize, outsize, error;
556
557 insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs));
558 UPARG(CODA_STATFS);
559
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700560 error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700561 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 sfs->f_blocks = outp->coda_statfs.stat.f_blocks;
563 sfs->f_bfree = outp->coda_statfs.stat.f_bfree;
564 sfs->f_bavail = outp->coda_statfs.stat.f_bavail;
565 sfs->f_files = outp->coda_statfs.stat.f_files;
566 sfs->f_ffree = outp->coda_statfs.stat.f_ffree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 }
568
569 CODA_FREE(inp, insize);
570 return error;
571}
572
573/*
574 * coda_upcall and coda_downcall routines.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 */
Al Viro5f47c7e2007-07-20 00:23:31 +0100576static void coda_block_signals(sigset_t *old)
Jan Harkesd9664c92007-07-19 01:48:46 -0700577{
578 spin_lock_irq(&current->sighand->siglock);
579 *old = current->blocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Jan Harkesd9664c92007-07-19 01:48:46 -0700581 sigfillset(&current->blocked);
582 sigdelset(&current->blocked, SIGKILL);
583 sigdelset(&current->blocked, SIGSTOP);
584 sigdelset(&current->blocked, SIGINT);
585
586 recalc_sigpending();
587 spin_unlock_irq(&current->sighand->siglock);
588}
589
Al Viro5f47c7e2007-07-20 00:23:31 +0100590static void coda_unblock_signals(sigset_t *old)
Jan Harkesd9664c92007-07-19 01:48:46 -0700591{
592 spin_lock_irq(&current->sighand->siglock);
593 current->blocked = *old;
594 recalc_sigpending();
595 spin_unlock_irq(&current->sighand->siglock);
596}
597
598/* Don't allow signals to interrupt the following upcalls before venus
599 * has seen them,
600 * - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems)
601 * - CODA_STORE (to avoid data loss)
602 */
603#define CODA_INTERRUPTIBLE(r) (!coda_hard && \
604 (((r)->uc_opcode != CODA_CLOSE && \
605 (r)->uc_opcode != CODA_STORE && \
606 (r)->uc_opcode != CODA_RELEASE) || \
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200607 (r)->uc_flags & CODA_REQ_READ))
Jan Harkesd9664c92007-07-19 01:48:46 -0700608
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400609static inline void coda_waitfor_upcall(struct venus_comm *vcp,
610 struct upc_req *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
612 DECLARE_WAITQUEUE(wait, current);
Jan Harkesd9664c92007-07-19 01:48:46 -0700613 unsigned long timeout = jiffies + coda_timeout * HZ;
614 sigset_t old;
615 int blocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Al Viro5f47c7e2007-07-20 00:23:31 +0100617 coda_block_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700618 blocked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Jan Harkesd9664c92007-07-19 01:48:46 -0700620 add_wait_queue(&req->uc_sleep, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 for (;;) {
Jan Harkesd9664c92007-07-19 01:48:46 -0700622 if (CODA_INTERRUPTIBLE(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 set_current_state(TASK_INTERRUPTIBLE);
624 else
625 set_current_state(TASK_UNINTERRUPTIBLE);
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 /* got a reply */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200628 if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 break;
630
Jan Harkesd9664c92007-07-19 01:48:46 -0700631 if (blocked && time_after(jiffies, timeout) &&
632 CODA_INTERRUPTIBLE(req))
633 {
Al Viro5f47c7e2007-07-20 00:23:31 +0100634 coda_unblock_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700635 blocked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Jan Harkesd9664c92007-07-19 01:48:46 -0700638 if (signal_pending(current)) {
639 list_del(&req->uc_chain);
640 break;
641 }
642
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400643 mutex_unlock(&vcp->vc_mutex);
Jan Harkesd9664c92007-07-19 01:48:46 -0700644 if (blocked)
645 schedule_timeout(HZ);
646 else
647 schedule();
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400648 mutex_lock(&vcp->vc_mutex);
Jan Harkesd9664c92007-07-19 01:48:46 -0700649 }
650 if (blocked)
Al Viro5f47c7e2007-07-20 00:23:31 +0100651 coda_unblock_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700652
653 remove_wait_queue(&req->uc_sleep, &wait);
654 set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
656
657
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700658/*
659 * coda_upcall will return an error in the case of
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 * failed communication with Venus _or_ will peek at Venus
661 * reply and return Venus' error.
662 *
663 * As venus has 2 types of errors, normal errors (positive) and internal
664 * errors (negative), normal errors are negated, while internal errors
665 * are all mapped to -EINTR, while showing a nice warning message. (jh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700667static int coda_upcall(struct venus_comm *vcp,
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700668 int inSize, int *outSize,
669 union inputArgs *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 union outputArgs *out;
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700672 union inputArgs *sig_inputArgs;
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400673 struct upc_req *req = NULL, *sig_req;
674 int error;
675
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400676 mutex_lock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700678 if (!vcp->vc_inuse) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700679 printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n");
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400680 error = -ENXIO;
681 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 }
683
684 /* Format the request message. */
Jan Harkes37461e12007-07-19 01:48:48 -0700685 req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400686 if (!req) {
687 error = -ENOMEM;
688 goto exit;
689 }
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 req->uc_data = (void *)buffer;
692 req->uc_flags = 0;
693 req->uc_inSize = inSize;
694 req->uc_outSize = *outSize ? *outSize : inSize;
695 req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700696 req->uc_unique = ++vcp->vc_seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 init_waitqueue_head(&req->uc_sleep);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 /* Fill in the common input args. */
700 ((union inputArgs *)buffer)->ih.unique = req->uc_unique;
701
702 /* Append msg to pending queue and poke Venus. */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700703 list_add_tail(&req->uc_chain, &vcp->vc_pending);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700704
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700705 wake_up_interruptible(&vcp->vc_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 /* We can be interrupted while we wait for Venus to process
707 * our request. If the interrupt occurs before Venus has read
708 * the request, we dequeue and return. If it occurs after the
709 * read but before the reply, we dequeue, send a signal
710 * message, and return. If it occurs after the reply we ignore
711 * it. In no case do we want to restart the syscall. If it
712 * was interrupted by a venus shutdown (psdev_close), return
713 * ENODEV. */
714
715 /* Go to sleep. Wake up on signals only after the timeout. */
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400716 coda_waitfor_upcall(vcp, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700718 /* Op went through, interrupt or not... */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200719 if (req->uc_flags & CODA_REQ_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 out = (union outputArgs *)req->uc_data;
721 /* here we map positive Venus errors to kernel errors */
722 error = -out->oh.result;
723 *outSize = req->uc_outSize;
724 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 }
726
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700727 error = -EINTR;
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200728 if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700729 printk(KERN_WARNING "coda: Unexpected interruption.\n");
730 goto exit;
731 }
732
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700733 /* Interrupted before venus read it. */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200734 if (!(req->uc_flags & CODA_REQ_READ))
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700735 goto exit;
736
737 /* Venus saw the upcall, make sure we can send interrupt signal */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700738 if (!vcp->vc_inuse) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700739 printk(KERN_INFO "coda: Venus dead, not sending signal.\n");
740 goto exit;
741 }
742
743 error = -ENOMEM;
Jan Harkes37461e12007-07-19 01:48:48 -0700744 sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700745 if (!sig_req) goto exit;
746
747 CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
748 if (!sig_req->uc_data) {
Jan Harkes37461e12007-07-19 01:48:48 -0700749 kfree(sig_req);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700750 goto exit;
751 }
752
753 error = -EINTR;
754 sig_inputArgs = (union inputArgs *)sig_req->uc_data;
755 sig_inputArgs->ih.opcode = CODA_SIGNAL;
756 sig_inputArgs->ih.unique = req->uc_unique;
757
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200758 sig_req->uc_flags = CODA_REQ_ASYNC;
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700759 sig_req->uc_opcode = sig_inputArgs->ih.opcode;
760 sig_req->uc_unique = sig_inputArgs->ih.unique;
761 sig_req->uc_inSize = sizeof(struct coda_in_hdr);
762 sig_req->uc_outSize = sizeof(struct coda_in_hdr);
763
764 /* insert at head of queue! */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700765 list_add(&(sig_req->uc_chain), &vcp->vc_pending);
766 wake_up_interruptible(&vcp->vc_waitq);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700767
768exit:
Jan Harkes37461e12007-07-19 01:48:48 -0700769 kfree(req);
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400770 mutex_unlock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 return error;
772}
773
774/*
775 The statements below are part of the Coda opportunistic
776 programming -- taken from the Mach/BSD kernel code for Coda.
777 You don't get correct semantics by stating what needs to be
778 done without guaranteeing the invariants needed for it to happen.
779 When will be have time to find out what exactly is going on? (pjb)
780*/
781
782
783/*
784 * There are 7 cases where cache invalidations occur. The semantics
785 * of each is listed here:
786 *
787 * CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
788 * CODA_PURGEUSER -- flush all entries from the name cache for a specific user
789 * This call is a result of token expiration.
790 *
791 * The next arise as the result of callbacks on a file or directory.
792 * CODA_ZAPFILE -- flush the cached attributes for a file.
793
794 * CODA_ZAPDIR -- flush the attributes for the dir and
795 * force a new lookup for all the children
796 of this dir.
797
798 *
799 * The next is a result of Venus detecting an inconsistent file.
800 * CODA_PURGEFID -- flush the attribute for the file
801 * purge it and its children from the dcache
802 *
803 * The last allows Venus to replace local fids with global ones
804 * during reintegration.
805 *
806 * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */
807
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400808int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
Jan Harkes5fd31e92007-07-19 01:48:49 -0700810 struct inode *inode = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400811 struct CodaFid *fid = NULL, *newfid;
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400812 struct super_block *sb;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 /* Handle invalidation requests. */
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400815 mutex_lock(&vcp->vc_mutex);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400816 sb = vcp->vc_sb;
817 if (!sb || !sb->s_root)
818 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Jan Harkes5fd31e92007-07-19 01:48:49 -0700820 switch (opcode) {
821 case CODA_FLUSH:
822 coda_cache_clear_all(sb);
823 shrink_dcache_sb(sb);
824 if (sb->s_root->d_inode)
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400825 coda_flag_inode(sb->s_root->d_inode, C_FLUSH);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700826 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Jan Harkes5fd31e92007-07-19 01:48:49 -0700828 case CODA_PURGEUSER:
829 coda_cache_clear_all(sb);
830 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Jan Harkes5fd31e92007-07-19 01:48:49 -0700832 case CODA_ZAPDIR:
833 fid = &out->coda_zapdir.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700834 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
Jan Harkes5fd31e92007-07-19 01:48:49 -0700836 case CODA_ZAPFILE:
837 fid = &out->coda_zapfile.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700838 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Jan Harkes5fd31e92007-07-19 01:48:49 -0700840 case CODA_PURGEFID:
841 fid = &out->coda_purgefid.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700842 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Jan Harkes5fd31e92007-07-19 01:48:49 -0700844 case CODA_REPLACE:
845 fid = &out->coda_replace.OldFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700846 break;
847 }
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400848 if (fid)
849 inode = coda_fid_to_inode(fid, sb);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700850
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400851unlock_out:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400852 mutex_unlock(&vcp->vc_mutex);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400853
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400854 if (!inode)
855 return 0;
856
857 switch (opcode) {
858 case CODA_ZAPDIR:
859 coda_flag_inode_children(inode, C_PURGE);
860 coda_flag_inode(inode, C_VATTR);
861 break;
862
863 case CODA_ZAPFILE:
864 coda_flag_inode(inode, C_VATTR);
865 break;
866
867 case CODA_PURGEFID:
868 coda_flag_inode_children(inode, C_PURGE);
869
870 /* catch the dentries later if some are still busy */
871 coda_flag_inode(inode, C_PURGE);
872 d_prune_aliases(inode);
873 break;
874
875 case CODA_REPLACE:
876 newfid = &out->coda_replace.NewFid;
877 coda_replace_fid(inode, fid, newfid);
878 break;
879 }
880 iput(inode);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700881 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882}
883