blob: 3a731976dc5e999ffb53b10458cb6dc72540fab8 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/signal.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040018#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/types.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/time.h>
23#include <linux/fs.h>
24#include <linux/file.h>
25#include <linux/stat.h>
26#include <linux/errno.h>
27#include <linux/string.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Yoshihisa Abeda47c192010-10-25 02:03:46 -040029#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/uaccess.h>
31#include <linux/vmalloc.h>
32#include <linux/vfs.h>
33
34#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050036#include "coda_linux.h"
37#include "coda_cache.h"
Jan Harkes3cf01f22007-07-19 01:48:51 -070038
39#include "coda_int.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Jan Harkesa1b0aa82007-07-19 01:48:50 -070041static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 union inputArgs *buffer);
43
44static 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;
Eric W. Biederman9fd973e2013-01-30 18:50:54 -080053 inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns);
54 inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns);
Eric W. Biedermand83f5902013-01-30 19:21:14 -080055 inp->ih.uid = from_kuid(&init_user_ns, current_fsuid());
Adrian Bunkde0ca062008-07-25 01:46:34 -070056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return (void*)inp;
58}
59
60#define UPARG(op)\
61do {\
62 inp = (union inputArgs *)alloc_upcall(op, insize); \
63 if (IS_ERR(inp)) { return PTR_ERR(inp); }\
64 outp = (union outputArgs *)(inp); \
65 outsize = insize; \
66} while (0)
67
68#define INSIZE(tag) sizeof(struct coda_ ## tag ## _in)
69#define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out)
70#define SIZE(tag) max_t(unsigned int, INSIZE(tag), OUTSIZE(tag))
71
72
73/* the upcalls */
74int venus_rootfid(struct super_block *sb, struct CodaFid *fidp)
75{
76 union inputArgs *inp;
77 union outputArgs *outp;
78 int insize, outsize, error;
79
80 insize = SIZE(root);
81 UPARG(CODA_ROOT);
82
Jan Harkesa1b0aa82007-07-19 01:48:50 -070083 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -070084 if (!error)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 *fidp = outp->coda_root.VFid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 CODA_FREE(inp, insize);
88 return error;
89}
90
91int venus_getattr(struct super_block *sb, struct CodaFid *fid,
92 struct coda_vattr *attr)
93{
94 union inputArgs *inp;
95 union outputArgs *outp;
96 int insize, outsize, error;
97
98 insize = SIZE(getattr);
99 UPARG(CODA_GETATTR);
100 inp->coda_getattr.VFid = *fid;
101
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700102 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700103 if (!error)
104 *attr = outp->coda_getattr.attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 CODA_FREE(inp, insize);
107 return error;
108}
109
110int venus_setattr(struct super_block *sb, struct CodaFid *fid,
111 struct coda_vattr *vattr)
112{
113 union inputArgs *inp;
114 union outputArgs *outp;
115 int insize, outsize, error;
116
117 insize = SIZE(setattr);
118 UPARG(CODA_SETATTR);
119
120 inp->coda_setattr.VFid = *fid;
121 inp->coda_setattr.attr = *vattr;
122
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700123 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 CODA_FREE(inp, insize);
126 return error;
127}
128
129int venus_lookup(struct super_block *sb, struct CodaFid *fid,
130 const char *name, int length, int * type,
131 struct CodaFid *resfid)
132{
133 union inputArgs *inp;
134 union outputArgs *outp;
135 int insize, outsize, error;
136 int offset;
137
138 offset = INSIZE(lookup);
139 insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup));
140 UPARG(CODA_LOOKUP);
141
142 inp->coda_lookup.VFid = *fid;
143 inp->coda_lookup.name = offset;
144 inp->coda_lookup.flags = CLU_CASE_SENSITIVE;
145 /* send Venus a null terminated string */
146 memcpy((char *)(inp) + offset, name, length);
147 *((char *)inp + offset + length) = '\0';
148
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700149 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700150 if (!error) {
151 *resfid = outp->coda_lookup.VFid;
152 *type = outp->coda_lookup.vtype;
153 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 CODA_FREE(inp, insize);
156 return error;
157}
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
Eric W. Biedermand83f5902013-01-30 19:21:14 -0800160 kuid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 union inputArgs *inp;
163 union outputArgs *outp;
164 int insize, outsize, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 insize = SIZE(release);
167 UPARG(CODA_CLOSE);
168
Eric W. Biedermand83f5902013-01-30 19:21:14 -0800169 inp->ih.uid = from_kuid(&init_user_ns, uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 inp->coda_close.VFid = *fid;
171 inp->coda_close.flags = flags;
172
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700173 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 CODA_FREE(inp, insize);
176 return error;
177}
178
179int venus_open(struct super_block *sb, struct CodaFid *fid,
180 int flags, struct file **fh)
181{
182 union inputArgs *inp;
183 union outputArgs *outp;
184 int insize, outsize, error;
185
186 insize = SIZE(open_by_fd);
187 UPARG(CODA_OPEN_BY_FD);
188
Jan Harkes38c2e432007-07-19 01:48:41 -0700189 inp->coda_open_by_fd.VFid = *fid;
190 inp->coda_open_by_fd.flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700192 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes38c2e432007-07-19 01:48:41 -0700193 if (!error)
194 *fh = outp->coda_open_by_fd.fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 CODA_FREE(inp, insize);
197 return error;
198}
199
200int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid,
201 const char *name, int length,
202 struct CodaFid *newfid, struct coda_vattr *attrs)
203{
204 union inputArgs *inp;
205 union outputArgs *outp;
206 int insize, outsize, error;
207 int offset;
208
209 offset = INSIZE(mkdir);
210 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir));
211 UPARG(CODA_MKDIR);
212
213 inp->coda_mkdir.VFid = *dirfid;
214 inp->coda_mkdir.attr = *attrs;
215 inp->coda_mkdir.name = offset;
216 /* Venus must get null terminated string */
217 memcpy((char *)(inp) + offset, name, length);
218 *((char *)inp + offset + length) = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700220 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700221 if (!error) {
222 *attrs = outp->coda_mkdir.attr;
223 *newfid = outp->coda_mkdir.VFid;
224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 CODA_FREE(inp, insize);
227 return error;
228}
229
230
231int venus_rename(struct super_block *sb, struct CodaFid *old_fid,
232 struct CodaFid *new_fid, size_t old_length,
233 size_t new_length, const char *old_name,
234 const char *new_name)
235{
236 union inputArgs *inp;
237 union outputArgs *outp;
238 int insize, outsize, error;
239 int offset, s;
240
241 offset = INSIZE(rename);
242 insize = max_t(unsigned int, offset + new_length + old_length + 8,
243 OUTSIZE(rename));
244 UPARG(CODA_RENAME);
245
246 inp->coda_rename.sourceFid = *old_fid;
247 inp->coda_rename.destFid = *new_fid;
248 inp->coda_rename.srcname = offset;
249
250 /* Venus must receive an null terminated string */
251 s = ( old_length & ~0x3) +4; /* round up to word boundary */
252 memcpy((char *)(inp) + offset, old_name, old_length);
253 *((char *)inp + offset + old_length) = '\0';
254
255 /* another null terminated string for Venus */
256 offset += s;
257 inp->coda_rename.destname = offset;
258 s = ( new_length & ~0x3) +4; /* round up to word boundary */
259 memcpy((char *)(inp) + offset, new_name, new_length);
260 *((char *)inp + offset + new_length) = '\0';
261
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700262 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 CODA_FREE(inp, insize);
265 return error;
266}
267
268int venus_create(struct super_block *sb, struct CodaFid *dirfid,
269 const char *name, int length, int excl, int mode,
270 struct CodaFid *newfid, struct coda_vattr *attrs)
271{
272 union inputArgs *inp;
273 union outputArgs *outp;
274 int insize, outsize, error;
275 int offset;
276
277 offset = INSIZE(create);
278 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create));
279 UPARG(CODA_CREATE);
280
281 inp->coda_create.VFid = *dirfid;
282 inp->coda_create.attr.va_mode = mode;
283 inp->coda_create.excl = excl;
284 inp->coda_create.mode = mode;
285 inp->coda_create.name = offset;
286
287 /* Venus must get null terminated string */
288 memcpy((char *)(inp) + offset, name, length);
289 *((char *)inp + offset + length) = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700291 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700292 if (!error) {
293 *attrs = outp->coda_create.attr;
294 *newfid = outp->coda_create.VFid;
295 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 CODA_FREE(inp, insize);
298 return error;
299}
300
301int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid,
302 const char *name, int length)
303{
304 union inputArgs *inp;
305 union outputArgs *outp;
306 int insize, outsize, error;
307 int offset;
308
309 offset = INSIZE(rmdir);
310 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir));
311 UPARG(CODA_RMDIR);
312
313 inp->coda_rmdir.VFid = *dirfid;
314 inp->coda_rmdir.name = offset;
315 memcpy((char *)(inp) + offset, name, length);
316 *((char *)inp + offset + length) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700317
318 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 CODA_FREE(inp, insize);
321 return error;
322}
323
324int venus_remove(struct super_block *sb, struct CodaFid *dirfid,
325 const char *name, int length)
326{
327 union inputArgs *inp;
328 union outputArgs *outp;
329 int error=0, insize, outsize, offset;
330
331 offset = INSIZE(remove);
332 insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove));
333 UPARG(CODA_REMOVE);
334
335 inp->coda_remove.VFid = *dirfid;
336 inp->coda_remove.name = offset;
337 memcpy((char *)(inp) + offset, name, length);
338 *((char *)inp + offset + length) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700339
340 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 CODA_FREE(inp, insize);
343 return error;
344}
345
346int venus_readlink(struct super_block *sb, struct CodaFid *fid,
347 char *buffer, int *length)
348{
349 union inputArgs *inp;
350 union outputArgs *outp;
351 int insize, outsize, error;
352 int retlen;
353 char *result;
354
355 insize = max_t(unsigned int,
356 INSIZE(readlink), OUTSIZE(readlink)+ *length + 1);
357 UPARG(CODA_READLINK);
358
359 inp->coda_readlink.VFid = *fid;
Jan Harkes970648e2007-07-19 01:48:48 -0700360
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700361 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700362 if (!error) {
363 retlen = outp->coda_readlink.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if ( retlen > *length )
Jan Harkes970648e2007-07-19 01:48:48 -0700365 retlen = *length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 *length = retlen;
367 result = (char *)outp + (long)outp->coda_readlink.data;
368 memcpy(buffer, result, retlen);
369 *(buffer + retlen) = '\0';
370 }
Jan Harkes970648e2007-07-19 01:48:48 -0700371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 CODA_FREE(inp, insize);
373 return error;
374}
375
376
377
378int venus_link(struct super_block *sb, struct CodaFid *fid,
379 struct CodaFid *dirfid, const char *name, int len )
380{
381 union inputArgs *inp;
382 union outputArgs *outp;
383 int insize, outsize, error;
384 int offset;
385
386 offset = INSIZE(link);
387 insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link));
388 UPARG(CODA_LINK);
389
390 inp->coda_link.sourceFid = *fid;
391 inp->coda_link.destFid = *dirfid;
392 inp->coda_link.tname = offset;
393
394 /* make sure strings are null terminated */
395 memcpy((char *)(inp) + offset, name, len);
396 *((char *)inp + offset + len) = '\0';
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700397
398 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 CODA_FREE(inp, insize);
401 return error;
402}
403
404int venus_symlink(struct super_block *sb, struct CodaFid *fid,
405 const char *name, int len,
406 const char *symname, int symlen)
407{
408 union inputArgs *inp;
409 union outputArgs *outp;
410 int insize, outsize, error;
411 int offset, s;
412
413 offset = INSIZE(symlink);
414 insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink));
415 UPARG(CODA_SYMLINK);
416
417 /* inp->coda_symlink.attr = *tva; XXXXXX */
418 inp->coda_symlink.VFid = *fid;
419
420 /* Round up to word boundary and null terminate */
421 inp->coda_symlink.srcname = offset;
422 s = ( symlen & ~0x3 ) + 4;
423 memcpy((char *)(inp) + offset, symname, symlen);
424 *((char *)inp + offset + symlen) = '\0';
425
426 /* Round up to word boundary and null terminate */
427 offset += s;
428 inp->coda_symlink.tname = offset;
429 s = (len & ~0x3) + 4;
430 memcpy((char *)(inp) + offset, name, len);
431 *((char *)inp + offset + len) = '\0';
432
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700433 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 CODA_FREE(inp, insize);
436 return error;
437}
438
439int venus_fsync(struct super_block *sb, struct CodaFid *fid)
440{
441 union inputArgs *inp;
442 union outputArgs *outp;
443 int insize, outsize, error;
444
445 insize=SIZE(fsync);
446 UPARG(CODA_FSYNC);
447
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700448 inp->coda_fsync.VFid = *fid;
449 error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs),
450 &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452 CODA_FREE(inp, insize);
453 return error;
454}
455
456int venus_access(struct super_block *sb, struct CodaFid *fid, int mask)
457{
458 union inputArgs *inp;
459 union outputArgs *outp;
460 int insize, outsize, error;
461
462 insize = SIZE(access);
463 UPARG(CODA_ACCESS);
464
465 inp->coda_access.VFid = *fid;
466 inp->coda_access.flags = mask;
467
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700468 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 CODA_FREE(inp, insize);
471 return error;
472}
473
474
475int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
476 unsigned int cmd, struct PioctlData *data)
477{
478 union inputArgs *inp;
479 union outputArgs *outp;
480 int insize, outsize, error;
481 int iocsize;
482
483 insize = VC_MAXMSGSIZE;
484 UPARG(CODA_IOCTL);
485
486 /* build packet for Venus */
487 if (data->vi.in_size > VC_MAXDATASIZE) {
488 error = -EINVAL;
489 goto exit;
490 }
491
492 if (data->vi.out_size > VC_MAXDATASIZE) {
493 error = -EINVAL;
494 goto exit;
495 }
496
497 inp->coda_ioctl.VFid = *fid;
498
499 /* the cmd field was mutated by increasing its size field to
500 * reflect the path and follow args. We need to subtract that
501 * out before sending the command to Venus. */
502 inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16));
503 iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int);
504 inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16;
505
506 /* in->coda_ioctl.rwflag = flag; */
507 inp->coda_ioctl.len = data->vi.in_size;
508 inp->coda_ioctl.data = (char *)(INSIZE(ioctl));
509
510 /* get the data out of user space */
511 if ( copy_from_user((char*)inp + (long)inp->coda_ioctl.data,
512 data->vi.in, data->vi.in_size) ) {
513 error = -EINVAL;
514 goto exit;
515 }
516
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700517 error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size,
518 &outsize, inp);
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (error) {
521 printk("coda_pioctl: Venus returns: %d for %s\n",
522 error, coda_f2s(fid));
523 goto exit;
524 }
525
526 if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) {
527 error = -EINVAL;
528 goto exit;
529 }
530
531 /* Copy out the OUT buffer. */
532 if (outp->coda_ioctl.len > data->vi.out_size) {
533 error = -EINVAL;
534 goto exit;
535 }
536
537 /* Copy out the OUT buffer. */
538 if (copy_to_user(data->vi.out,
539 (char *)outp + (long)outp->coda_ioctl.data,
540 outp->coda_ioctl.len)) {
541 error = -EFAULT;
542 goto exit;
543 }
544
545 exit:
546 CODA_FREE(inp, insize);
547 return error;
548}
549
David Howells726c3342006-06-23 02:02:58 -0700550int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
552 union inputArgs *inp;
553 union outputArgs *outp;
554 int insize, outsize, error;
555
556 insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs));
557 UPARG(CODA_STATFS);
558
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700559 error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp);
Jan Harkes970648e2007-07-19 01:48:48 -0700560 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 sfs->f_blocks = outp->coda_statfs.stat.f_blocks;
562 sfs->f_bfree = outp->coda_statfs.stat.f_bfree;
563 sfs->f_bavail = outp->coda_statfs.stat.f_bavail;
564 sfs->f_files = outp->coda_statfs.stat.f_files;
565 sfs->f_ffree = outp->coda_statfs.stat.f_ffree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
567
568 CODA_FREE(inp, insize);
569 return error;
570}
571
572/*
573 * coda_upcall and coda_downcall routines.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 */
Al Viro5f47c7e2007-07-20 00:23:31 +0100575static void coda_block_signals(sigset_t *old)
Jan Harkesd9664c92007-07-19 01:48:46 -0700576{
577 spin_lock_irq(&current->sighand->siglock);
578 *old = current->blocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Jan Harkesd9664c92007-07-19 01:48:46 -0700580 sigfillset(&current->blocked);
581 sigdelset(&current->blocked, SIGKILL);
582 sigdelset(&current->blocked, SIGSTOP);
583 sigdelset(&current->blocked, SIGINT);
584
585 recalc_sigpending();
586 spin_unlock_irq(&current->sighand->siglock);
587}
588
Al Viro5f47c7e2007-07-20 00:23:31 +0100589static void coda_unblock_signals(sigset_t *old)
Jan Harkesd9664c92007-07-19 01:48:46 -0700590{
591 spin_lock_irq(&current->sighand->siglock);
592 current->blocked = *old;
593 recalc_sigpending();
594 spin_unlock_irq(&current->sighand->siglock);
595}
596
597/* Don't allow signals to interrupt the following upcalls before venus
598 * has seen them,
599 * - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems)
600 * - CODA_STORE (to avoid data loss)
601 */
602#define CODA_INTERRUPTIBLE(r) (!coda_hard && \
603 (((r)->uc_opcode != CODA_CLOSE && \
604 (r)->uc_opcode != CODA_STORE && \
605 (r)->uc_opcode != CODA_RELEASE) || \
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200606 (r)->uc_flags & CODA_REQ_READ))
Jan Harkesd9664c92007-07-19 01:48:46 -0700607
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400608static inline void coda_waitfor_upcall(struct venus_comm *vcp,
609 struct upc_req *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
611 DECLARE_WAITQUEUE(wait, current);
Jan Harkesd9664c92007-07-19 01:48:46 -0700612 unsigned long timeout = jiffies + coda_timeout * HZ;
613 sigset_t old;
614 int blocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Al Viro5f47c7e2007-07-20 00:23:31 +0100616 coda_block_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700617 blocked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Jan Harkesd9664c92007-07-19 01:48:46 -0700619 add_wait_queue(&req->uc_sleep, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 for (;;) {
Jan Harkesd9664c92007-07-19 01:48:46 -0700621 if (CODA_INTERRUPTIBLE(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 set_current_state(TASK_INTERRUPTIBLE);
623 else
624 set_current_state(TASK_UNINTERRUPTIBLE);
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 /* got a reply */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200627 if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 break;
629
Jan Harkesd9664c92007-07-19 01:48:46 -0700630 if (blocked && time_after(jiffies, timeout) &&
631 CODA_INTERRUPTIBLE(req))
632 {
Al Viro5f47c7e2007-07-20 00:23:31 +0100633 coda_unblock_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700634 blocked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Jan Harkesd9664c92007-07-19 01:48:46 -0700637 if (signal_pending(current)) {
638 list_del(&req->uc_chain);
639 break;
640 }
641
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400642 mutex_unlock(&vcp->vc_mutex);
Jan Harkesd9664c92007-07-19 01:48:46 -0700643 if (blocked)
644 schedule_timeout(HZ);
645 else
646 schedule();
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400647 mutex_lock(&vcp->vc_mutex);
Jan Harkesd9664c92007-07-19 01:48:46 -0700648 }
649 if (blocked)
Al Viro5f47c7e2007-07-20 00:23:31 +0100650 coda_unblock_signals(&old);
Jan Harkesd9664c92007-07-19 01:48:46 -0700651
652 remove_wait_queue(&req->uc_sleep, &wait);
653 set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
656
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700657/*
658 * coda_upcall will return an error in the case of
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 * failed communication with Venus _or_ will peek at Venus
660 * reply and return Venus' error.
661 *
662 * As venus has 2 types of errors, normal errors (positive) and internal
663 * errors (negative), normal errors are negated, while internal errors
664 * are all mapped to -EINTR, while showing a nice warning message. (jh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700666static int coda_upcall(struct venus_comm *vcp,
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700667 int inSize, int *outSize,
668 union inputArgs *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 union outputArgs *out;
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700671 union inputArgs *sig_inputArgs;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400672 struct upc_req *req = NULL, *sig_req;
673 int error;
674
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400675 mutex_lock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700677 if (!vcp->vc_inuse) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700678 printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n");
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400679 error = -ENXIO;
680 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 }
682
683 /* Format the request message. */
Jan Harkes37461e12007-07-19 01:48:48 -0700684 req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400685 if (!req) {
686 error = -ENOMEM;
687 goto exit;
688 }
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 req->uc_data = (void *)buffer;
691 req->uc_flags = 0;
692 req->uc_inSize = inSize;
693 req->uc_outSize = *outSize ? *outSize : inSize;
694 req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700695 req->uc_unique = ++vcp->vc_seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 init_waitqueue_head(&req->uc_sleep);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 /* Fill in the common input args. */
699 ((union inputArgs *)buffer)->ih.unique = req->uc_unique;
700
701 /* Append msg to pending queue and poke Venus. */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700702 list_add_tail(&req->uc_chain, &vcp->vc_pending);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700703
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700704 wake_up_interruptible(&vcp->vc_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 /* We can be interrupted while we wait for Venus to process
706 * our request. If the interrupt occurs before Venus has read
707 * the request, we dequeue and return. If it occurs after the
708 * read but before the reply, we dequeue, send a signal
709 * message, and return. If it occurs after the reply we ignore
710 * it. In no case do we want to restart the syscall. If it
711 * was interrupted by a venus shutdown (psdev_close), return
712 * ENODEV. */
713
714 /* Go to sleep. Wake up on signals only after the timeout. */
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400715 coda_waitfor_upcall(vcp, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700717 /* Op went through, interrupt or not... */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200718 if (req->uc_flags & CODA_REQ_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 out = (union outputArgs *)req->uc_data;
720 /* here we map positive Venus errors to kernel errors */
721 error = -out->oh.result;
722 *outSize = req->uc_outSize;
723 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
725
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700726 error = -EINTR;
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200727 if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700728 printk(KERN_WARNING "coda: Unexpected interruption.\n");
729 goto exit;
730 }
731
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700732 /* Interrupted before venus read it. */
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200733 if (!(req->uc_flags & CODA_REQ_READ))
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700734 goto exit;
735
736 /* Venus saw the upcall, make sure we can send interrupt signal */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700737 if (!vcp->vc_inuse) {
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700738 printk(KERN_INFO "coda: Venus dead, not sending signal.\n");
739 goto exit;
740 }
741
742 error = -ENOMEM;
Jan Harkes37461e12007-07-19 01:48:48 -0700743 sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700744 if (!sig_req) goto exit;
745
746 CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
747 if (!sig_req->uc_data) {
Jan Harkes37461e12007-07-19 01:48:48 -0700748 kfree(sig_req);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700749 goto exit;
750 }
751
752 error = -EINTR;
753 sig_inputArgs = (union inputArgs *)sig_req->uc_data;
754 sig_inputArgs->ih.opcode = CODA_SIGNAL;
755 sig_inputArgs->ih.unique = req->uc_unique;
756
Jens Axboe4aeefdc2010-08-03 13:22:51 +0200757 sig_req->uc_flags = CODA_REQ_ASYNC;
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700758 sig_req->uc_opcode = sig_inputArgs->ih.opcode;
759 sig_req->uc_unique = sig_inputArgs->ih.unique;
760 sig_req->uc_inSize = sizeof(struct coda_in_hdr);
761 sig_req->uc_outSize = sizeof(struct coda_in_hdr);
762
763 /* insert at head of queue! */
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700764 list_add(&(sig_req->uc_chain), &vcp->vc_pending);
765 wake_up_interruptible(&vcp->vc_waitq);
Jan Harkesfe71b5f2007-07-19 01:48:46 -0700766
767exit:
Jan Harkes37461e12007-07-19 01:48:48 -0700768 kfree(req);
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400769 mutex_unlock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 return error;
771}
772
773/*
774 The statements below are part of the Coda opportunistic
775 programming -- taken from the Mach/BSD kernel code for Coda.
776 You don't get correct semantics by stating what needs to be
777 done without guaranteeing the invariants needed for it to happen.
778 When will be have time to find out what exactly is going on? (pjb)
779*/
780
781
782/*
783 * There are 7 cases where cache invalidations occur. The semantics
784 * of each is listed here:
785 *
786 * CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
787 * CODA_PURGEUSER -- flush all entries from the name cache for a specific user
788 * This call is a result of token expiration.
789 *
790 * The next arise as the result of callbacks on a file or directory.
791 * CODA_ZAPFILE -- flush the cached attributes for a file.
792
793 * CODA_ZAPDIR -- flush the attributes for the dir and
794 * force a new lookup for all the children
795 of this dir.
796
797 *
798 * The next is a result of Venus detecting an inconsistent file.
799 * CODA_PURGEFID -- flush the attribute for the file
800 * purge it and its children from the dcache
801 *
802 * The last allows Venus to replace local fids with global ones
803 * during reintegration.
804 *
805 * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */
806
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400807int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Jan Harkes5fd31e92007-07-19 01:48:49 -0700809 struct inode *inode = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400810 struct CodaFid *fid = NULL, *newfid;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400811 struct super_block *sb;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 /* Handle invalidation requests. */
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400814 mutex_lock(&vcp->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400815 sb = vcp->vc_sb;
816 if (!sb || !sb->s_root)
817 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
Jan Harkes5fd31e92007-07-19 01:48:49 -0700819 switch (opcode) {
820 case CODA_FLUSH:
821 coda_cache_clear_all(sb);
822 shrink_dcache_sb(sb);
823 if (sb->s_root->d_inode)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400824 coda_flag_inode(sb->s_root->d_inode, C_FLUSH);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700825 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Jan Harkes5fd31e92007-07-19 01:48:49 -0700827 case CODA_PURGEUSER:
828 coda_cache_clear_all(sb);
829 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Jan Harkes5fd31e92007-07-19 01:48:49 -0700831 case CODA_ZAPDIR:
832 fid = &out->coda_zapdir.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700833 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Jan Harkes5fd31e92007-07-19 01:48:49 -0700835 case CODA_ZAPFILE:
836 fid = &out->coda_zapfile.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700837 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Jan Harkes5fd31e92007-07-19 01:48:49 -0700839 case CODA_PURGEFID:
840 fid = &out->coda_purgefid.CodaFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700841 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Jan Harkes5fd31e92007-07-19 01:48:49 -0700843 case CODA_REPLACE:
844 fid = &out->coda_replace.OldFid;
Jan Harkes5fd31e92007-07-19 01:48:49 -0700845 break;
846 }
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400847 if (fid)
848 inode = coda_fid_to_inode(fid, sb);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700849
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400850unlock_out:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400851 mutex_unlock(&vcp->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400852
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400853 if (!inode)
854 return 0;
855
856 switch (opcode) {
857 case CODA_ZAPDIR:
858 coda_flag_inode_children(inode, C_PURGE);
859 coda_flag_inode(inode, C_VATTR);
860 break;
861
862 case CODA_ZAPFILE:
863 coda_flag_inode(inode, C_VATTR);
864 break;
865
866 case CODA_PURGEFID:
867 coda_flag_inode_children(inode, C_PURGE);
868
869 /* catch the dentries later if some are still busy */
870 coda_flag_inode(inode, C_PURGE);
871 d_prune_aliases(inode);
872 break;
873
874 case CODA_REPLACE:
875 newfid = &out->coda_replace.NewFid;
876 coda_replace_fid(inode, fid, newfid);
877 break;
878 }
879 iput(inode);
Jan Harkes5fd31e92007-07-19 01:48:49 -0700880 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881}
882