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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>
19#include <linux/sched.h>
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 <linux/slab.h>
30#include <linux/mutex.h>
31#include <asm/uaccess.h>
32#include <linux/vmalloc.h>
33#include <linux/vfs.h>
34
35#include <linux/coda.h>
36#include <linux/coda_psdev.h>
37#include "coda_linux.h"
38#include "coda_cache.h"
39
40#include "coda_int.h"
41
42static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
43 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;
55 inp->ih.pgid = task_pgrp_nr(current);
56 inp->ih.uid = current_fsuid();
57
58 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
84 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
85 if (!error)
86 *fidp = outp->coda_root.VFid;
87
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
103 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
104 if (!error)
105 *attr = outp->coda_getattr.attr;
106
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
124 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
125
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
150 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
151 if (!error) {
152 *resfid = outp->coda_lookup.VFid;
153 *type = outp->coda_lookup.vtype;
154 }
155
156 CODA_FREE(inp, insize);
157 return error;
158}
159
160int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
161 vuid_t uid)
162{
163 union inputArgs *inp;
164 union outputArgs *outp;
165 int insize, outsize, error;
166
167 insize = SIZE(release);
168 UPARG(CODA_CLOSE);
169
170 inp->ih.uid = uid;
171 inp->coda_close.VFid = *fid;
172 inp->coda_close.flags = flags;
173
174 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
175
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
190 inp->coda_open_by_fd.VFid = *fid;
191 inp->coda_open_by_fd.flags = flags;
192
193 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
194 if (!error)
195 *fh = outp->coda_open_by_fd.fh;
196
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';
220
221 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
222 if (!error) {
223 *attrs = outp->coda_mkdir.attr;
224 *newfid = outp->coda_mkdir.VFid;
225 }
226
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
263 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
264
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';
291
292 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
293 if (!error) {
294 *attrs = outp->coda_create.attr;
295 *newfid = outp->coda_create.VFid;
296 }
297
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';
318
319 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
320
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';
340
341 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
342
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;
361
362 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
363 if (!error) {
364 retlen = outp->coda_readlink.count;
365 if ( retlen > *length )
366 retlen = *length;
367 *length = retlen;
368 result = (char *)outp + (long)outp->coda_readlink.data;
369 memcpy(buffer, result, retlen);
370 *(buffer + retlen) = '\0';
371 }
372
373 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';
398
399 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
400
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
434 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
435
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
449 inp->coda_fsync.VFid = *fid;
450 error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs),
451 &outsize, inp);
452
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
469 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
470
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
518 error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size,
519 &outsize, inp);
520
521 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
551int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
552{
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
560 error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp);
561 if (!error) {
562 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;
567 }
568
569 CODA_FREE(inp, insize);
570 return error;
571}
572
573/*
574 * coda_upcall and coda_downcall routines.
575 */
576static void coda_block_signals(sigset_t *old)
577{
578 spin_lock_irq(¤t->sighand->siglock);
579 *old = current->blocked;
580
581 sigfillset(¤t->blocked);
582 sigdelset(¤t->blocked, SIGKILL);
583 sigdelset(¤t->blocked, SIGSTOP);
584 sigdelset(¤t->blocked, SIGINT);
585
586 recalc_sigpending();
587 spin_unlock_irq(¤t->sighand->siglock);
588}
589
590static void coda_unblock_signals(sigset_t *old)
591{
592 spin_lock_irq(¤t->sighand->siglock);
593 current->blocked = *old;
594 recalc_sigpending();
595 spin_unlock_irq(¤t->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) || \
607 (r)->uc_flags & CODA_REQ_READ))
608
609static inline void coda_waitfor_upcall(struct venus_comm *vcp,
610 struct upc_req *req)
611{
612 DECLARE_WAITQUEUE(wait, current);
613 unsigned long timeout = jiffies + coda_timeout * HZ;
614 sigset_t old;
615 int blocked;
616
617 coda_block_signals(&old);
618 blocked = 1;
619
620 add_wait_queue(&req->uc_sleep, &wait);
621 for (;;) {
622 if (CODA_INTERRUPTIBLE(req))
623 set_current_state(TASK_INTERRUPTIBLE);
624 else
625 set_current_state(TASK_UNINTERRUPTIBLE);
626
627 /* got a reply */
628 if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
629 break;
630
631 if (blocked && time_after(jiffies, timeout) &&
632 CODA_INTERRUPTIBLE(req))
633 {
634 coda_unblock_signals(&old);
635 blocked = 0;
636 }
637
638 if (signal_pending(current)) {
639 list_del(&req->uc_chain);
640 break;
641 }
642
643 mutex_unlock(&vcp->vc_mutex);
644 if (blocked)
645 schedule_timeout(HZ);
646 else
647 schedule();
648 mutex_lock(&vcp->vc_mutex);
649 }
650 if (blocked)
651 coda_unblock_signals(&old);
652
653 remove_wait_queue(&req->uc_sleep, &wait);
654 set_current_state(TASK_RUNNING);
655}
656
657
658/*
659 * coda_upcall will return an error in the case of
660 * 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)
666 */
667static int coda_upcall(struct venus_comm *vcp,
668 int inSize, int *outSize,
669 union inputArgs *buffer)
670{
671 union outputArgs *out;
672 union inputArgs *sig_inputArgs;
673 struct upc_req *req = NULL, *sig_req;
674 int error;
675
676 mutex_lock(&vcp->vc_mutex);
677
678 if (!vcp->vc_inuse) {
679 printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n");
680 error = -ENXIO;
681 goto exit;
682 }
683
684 /* Format the request message. */
685 req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
686 if (!req) {
687 error = -ENOMEM;
688 goto exit;
689 }
690
691 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;
696 req->uc_unique = ++vcp->vc_seq;
697 init_waitqueue_head(&req->uc_sleep);
698
699 /* 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. */
703 list_add_tail(&req->uc_chain, &vcp->vc_pending);
704
705 wake_up_interruptible(&vcp->vc_waitq);
706 /* 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. */
716 coda_waitfor_upcall(vcp, req);
717
718 /* Op went through, interrupt or not... */
719 if (req->uc_flags & CODA_REQ_WRITE) {
720 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;
725 }
726
727 error = -EINTR;
728 if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
729 printk(KERN_WARNING "coda: Unexpected interruption.\n");
730 goto exit;
731 }
732
733 /* Interrupted before venus read it. */
734 if (!(req->uc_flags & CODA_REQ_READ))
735 goto exit;
736
737 /* Venus saw the upcall, make sure we can send interrupt signal */
738 if (!vcp->vc_inuse) {
739 printk(KERN_INFO "coda: Venus dead, not sending signal.\n");
740 goto exit;
741 }
742
743 error = -ENOMEM;
744 sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
745 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) {
749 kfree(sig_req);
750 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
758 sig_req->uc_flags = CODA_REQ_ASYNC;
759 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! */
765 list_add(&(sig_req->uc_chain), &vcp->vc_pending);
766 wake_up_interruptible(&vcp->vc_waitq);
767
768exit:
769 kfree(req);
770 mutex_unlock(&vcp->vc_mutex);
771 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
808int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out)
809{
810 struct inode *inode = NULL;
811 struct CodaFid *fid = NULL, *newfid;
812 struct super_block *sb;
813
814 /* Handle invalidation requests. */
815 mutex_lock(&vcp->vc_mutex);
816 sb = vcp->vc_sb;
817 if (!sb || !sb->s_root)
818 goto unlock_out;
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 break;
835
836 case CODA_ZAPFILE:
837 fid = &out->coda_zapfile.CodaFid;
838 break;
839
840 case CODA_PURGEFID:
841 fid = &out->coda_purgefid.CodaFid;
842 break;
843
844 case CODA_REPLACE:
845 fid = &out->coda_replace.OldFid;
846 break;
847 }
848 if (fid)
849 inode = coda_fid_to_inode(fid, sb);
850
851unlock_out:
852 mutex_unlock(&vcp->vc_mutex);
853
854 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);
881 return 0;
882}
883
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Mostly platform independent upcall operations to Venus:
4 * -- upcalls
5 * -- upcall routines
6 *
7 * Linux 2.0 version
8 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>,
9 * Michael Callahan <callahan@maths.ox.ac.uk>
10 *
11 * Redone for Linux 2.1
12 * Copyright (C) 1997 Carnegie Mellon University
13 *
14 * Carnegie Mellon University encourages users of this code to contribute
15 * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
16 */
17
18#include <linux/signal.h>
19#include <linux/sched/signal.h>
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 <linux/slab.h>
30#include <linux/mutex.h>
31#include <linux/uaccess.h>
32#include <linux/vmalloc.h>
33#include <linux/vfs.h>
34
35#include <linux/coda.h>
36#include <linux/coda_psdev.h>
37#include "coda_linux.h"
38#include "coda_cache.h"
39
40#include "coda_int.h"
41
42static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
43 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 = task_pid_nr_ns(current, &init_pid_ns);
55 inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns);
56 inp->ih.uid = from_kuid(&init_user_ns, current_fsuid());
57
58 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
84 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
85 if (!error)
86 *fidp = outp->coda_root.VFid;
87
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
103 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
104 if (!error)
105 *attr = outp->coda_getattr.attr;
106
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
124 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
125
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
150 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
151 if (!error) {
152 *resfid = outp->coda_lookup.VFid;
153 *type = outp->coda_lookup.vtype;
154 }
155
156 CODA_FREE(inp, insize);
157 return error;
158}
159
160int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
161 kuid_t uid)
162{
163 union inputArgs *inp;
164 union outputArgs *outp;
165 int insize, outsize, error;
166
167 insize = SIZE(release);
168 UPARG(CODA_CLOSE);
169
170 inp->ih.uid = from_kuid(&init_user_ns, uid);
171 inp->coda_close.VFid = *fid;
172 inp->coda_close.flags = flags;
173
174 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
175
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
190 inp->coda_open_by_fd.VFid = *fid;
191 inp->coda_open_by_fd.flags = flags;
192
193 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
194 if (!error)
195 *fh = outp->coda_open_by_fd.fh;
196
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';
220
221 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
222 if (!error) {
223 *attrs = outp->coda_mkdir.attr;
224 *newfid = outp->coda_mkdir.VFid;
225 }
226
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
263 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
264
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';
291
292 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
293 if (!error) {
294 *attrs = outp->coda_create.attr;
295 *newfid = outp->coda_create.VFid;
296 }
297
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';
318
319 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
320
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';
340
341 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
342
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);
358 UPARG(CODA_READLINK);
359
360 inp->coda_readlink.VFid = *fid;
361
362 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
363 if (!error) {
364 retlen = outp->coda_readlink.count;
365 if (retlen >= *length)
366 retlen = *length - 1;
367 *length = retlen;
368 result = (char *)outp + (long)outp->coda_readlink.data;
369 memcpy(buffer, result, retlen);
370 *(buffer + retlen) = '\0';
371 }
372
373 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';
398
399 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
400
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
434 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
435
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
449 inp->coda_fsync.VFid = *fid;
450 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
451
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
468 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
469
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
517 error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size,
518 &outsize, inp);
519
520 if (error) {
521 pr_warn("%s: Venus returns: %d for %s\n",
522 __func__, 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
550int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
551{
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
559 error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp);
560 if (!error) {
561 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;
566 }
567
568 CODA_FREE(inp, insize);
569 return error;
570}
571
572/*
573 * coda_upcall and coda_downcall routines.
574 */
575static void coda_block_signals(sigset_t *old)
576{
577 spin_lock_irq(¤t->sighand->siglock);
578 *old = current->blocked;
579
580 sigfillset(¤t->blocked);
581 sigdelset(¤t->blocked, SIGKILL);
582 sigdelset(¤t->blocked, SIGSTOP);
583 sigdelset(¤t->blocked, SIGINT);
584
585 recalc_sigpending();
586 spin_unlock_irq(¤t->sighand->siglock);
587}
588
589static void coda_unblock_signals(sigset_t *old)
590{
591 spin_lock_irq(¤t->sighand->siglock);
592 current->blocked = *old;
593 recalc_sigpending();
594 spin_unlock_irq(¤t->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) || \
606 (r)->uc_flags & CODA_REQ_READ))
607
608static inline void coda_waitfor_upcall(struct venus_comm *vcp,
609 struct upc_req *req)
610{
611 DECLARE_WAITQUEUE(wait, current);
612 unsigned long timeout = jiffies + coda_timeout * HZ;
613 sigset_t old;
614 int blocked;
615
616 coda_block_signals(&old);
617 blocked = 1;
618
619 add_wait_queue(&req->uc_sleep, &wait);
620 for (;;) {
621 if (CODA_INTERRUPTIBLE(req))
622 set_current_state(TASK_INTERRUPTIBLE);
623 else
624 set_current_state(TASK_UNINTERRUPTIBLE);
625
626 /* got a reply */
627 if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
628 break;
629
630 if (blocked && time_after(jiffies, timeout) &&
631 CODA_INTERRUPTIBLE(req))
632 {
633 coda_unblock_signals(&old);
634 blocked = 0;
635 }
636
637 if (signal_pending(current)) {
638 list_del(&req->uc_chain);
639 break;
640 }
641
642 mutex_unlock(&vcp->vc_mutex);
643 if (blocked)
644 schedule_timeout(HZ);
645 else
646 schedule();
647 mutex_lock(&vcp->vc_mutex);
648 }
649 if (blocked)
650 coda_unblock_signals(&old);
651
652 remove_wait_queue(&req->uc_sleep, &wait);
653 set_current_state(TASK_RUNNING);
654}
655
656
657/*
658 * coda_upcall will return an error in the case of
659 * 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)
665 */
666static int coda_upcall(struct venus_comm *vcp,
667 int inSize, int *outSize,
668 union inputArgs *buffer)
669{
670 union outputArgs *out;
671 union inputArgs *sig_inputArgs;
672 struct upc_req *req = NULL, *sig_req;
673 int error;
674
675 mutex_lock(&vcp->vc_mutex);
676
677 if (!vcp->vc_inuse) {
678 pr_notice("Venus dead, not sending upcall\n");
679 error = -ENXIO;
680 goto exit;
681 }
682
683 /* Format the request message. */
684 req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
685 if (!req) {
686 error = -ENOMEM;
687 goto exit;
688 }
689
690 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;
695 req->uc_unique = ++vcp->vc_seq;
696 init_waitqueue_head(&req->uc_sleep);
697
698 /* 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. */
702 list_add_tail(&req->uc_chain, &vcp->vc_pending);
703
704 wake_up_interruptible(&vcp->vc_waitq);
705 /* 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. */
715 coda_waitfor_upcall(vcp, req);
716
717 /* Op went through, interrupt or not... */
718 if (req->uc_flags & CODA_REQ_WRITE) {
719 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;
724 }
725
726 error = -EINTR;
727 if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
728 pr_warn("Unexpected interruption.\n");
729 goto exit;
730 }
731
732 /* Interrupted before venus read it. */
733 if (!(req->uc_flags & CODA_REQ_READ))
734 goto exit;
735
736 /* Venus saw the upcall, make sure we can send interrupt signal */
737 if (!vcp->vc_inuse) {
738 pr_info("Venus dead, not sending signal.\n");
739 goto exit;
740 }
741
742 error = -ENOMEM;
743 sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
744 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) {
748 kfree(sig_req);
749 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
757 sig_req->uc_flags = CODA_REQ_ASYNC;
758 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! */
764 list_add(&(sig_req->uc_chain), &vcp->vc_pending);
765 wake_up_interruptible(&vcp->vc_waitq);
766
767exit:
768 kfree(req);
769 mutex_unlock(&vcp->vc_mutex);
770 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
807int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out)
808{
809 struct inode *inode = NULL;
810 struct CodaFid *fid = NULL, *newfid;
811 struct super_block *sb;
812
813 /* Handle invalidation requests. */
814 mutex_lock(&vcp->vc_mutex);
815 sb = vcp->vc_sb;
816 if (!sb || !sb->s_root)
817 goto unlock_out;
818
819 switch (opcode) {
820 case CODA_FLUSH:
821 coda_cache_clear_all(sb);
822 shrink_dcache_sb(sb);
823 if (d_really_is_positive(sb->s_root))
824 coda_flag_inode(d_inode(sb->s_root), C_FLUSH);
825 break;
826
827 case CODA_PURGEUSER:
828 coda_cache_clear_all(sb);
829 break;
830
831 case CODA_ZAPDIR:
832 fid = &out->coda_zapdir.CodaFid;
833 break;
834
835 case CODA_ZAPFILE:
836 fid = &out->coda_zapfile.CodaFid;
837 break;
838
839 case CODA_PURGEFID:
840 fid = &out->coda_purgefid.CodaFid;
841 break;
842
843 case CODA_REPLACE:
844 fid = &out->coda_replace.OldFid;
845 break;
846 }
847 if (fid)
848 inode = coda_fid_to_inode(fid, sb);
849
850unlock_out:
851 mutex_unlock(&vcp->vc_mutex);
852
853 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);
880 return 0;
881}
882