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 <asm/uaccess.h>
30 #include <linux/vmalloc.h>
31 #include <linux/vfs.h>
32
33 #include <linux/coda.h>
34 #include <linux/coda_linux.h>
35 #include <linux/coda_psdev.h>
36 #include <linux/coda_fs_i.h>
37 #include <linux/coda_cache.h>
38
39 #include "coda_int.h"
40
41 static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
42 union inputArgs *buffer);
43
44 static void *alloc_upcall(int opcode, int size)
45 {
46 union inputArgs *inp;
47
48 CODA_ALLOC(inp, union inputArgs *, size);
49 if (!inp)
50 return ERR_PTR(-ENOMEM);
51
52 inp->ih.opcode = opcode;
53 inp->ih.pid = current->pid;
54 inp->ih.pgid = task_pgrp_nr(current);
55 inp->ih.uid = current_fsuid();
56
57 return (void*)inp;
58 }
59
60 #define UPARG(op)\
61 do {\
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 */
74 int 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
83 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
84 if (!error)
85 *fidp = outp->coda_root.VFid;
86
87 CODA_FREE(inp, insize);
88 return error;
89 }
90
91 int 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
102 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
103 if (!error)
104 *attr = outp->coda_getattr.attr;
105
106 CODA_FREE(inp, insize);
107 return error;
108 }
109
110 int 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
123 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
124
125 CODA_FREE(inp, insize);
126 return error;
127 }
128
129 int 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
149 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
150 if (!error) {
151 *resfid = outp->coda_lookup.VFid;
152 *type = outp->coda_lookup.vtype;
153 }
154
155 CODA_FREE(inp, insize);
156 return error;
157 }
158
159 int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
160 vuid_t uid)
161 {
162 union inputArgs *inp;
163 union outputArgs *outp;
164 int insize, outsize, error;
165
166 insize = SIZE(release);
167 UPARG(CODA_CLOSE);
168
169 inp->ih.uid = uid;
170 inp->coda_close.VFid = *fid;
171 inp->coda_close.flags = flags;
172
173 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
174
175 CODA_FREE(inp, insize);
176 return error;
177 }
178
179 int 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
189 inp->coda_open_by_fd.VFid = *fid;
190 inp->coda_open_by_fd.flags = flags;
191
192 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
193 if (!error)
194 *fh = outp->coda_open_by_fd.fh;
195
196 CODA_FREE(inp, insize);
197 return error;
198 }
199
200 int 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';
219
220 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
221 if (!error) {
222 *attrs = outp->coda_mkdir.attr;
223 *newfid = outp->coda_mkdir.VFid;
224 }
225
226 CODA_FREE(inp, insize);
227 return error;
228 }
229
230
231 int 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
262 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
263
264 CODA_FREE(inp, insize);
265 return error;
266 }
267
268 int 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';
290
291 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
292 if (!error) {
293 *attrs = outp->coda_create.attr;
294 *newfid = outp->coda_create.VFid;
295 }
296
297 CODA_FREE(inp, insize);
298 return error;
299 }
300
301 int 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';
317
318 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
319
320 CODA_FREE(inp, insize);
321 return error;
322 }
323
324 int 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';
339
340 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
341
342 CODA_FREE(inp, insize);
343 return error;
344 }
345
346 int 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;
360
361 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
362 if (!error) {
363 retlen = outp->coda_readlink.count;
364 if ( retlen > *length )
365 retlen = *length;
366 *length = retlen;
367 result = (char *)outp + (long)outp->coda_readlink.data;
368 memcpy(buffer, result, retlen);
369 *(buffer + retlen) = '\0';
370 }
371
372 CODA_FREE(inp, insize);
373 return error;
374 }
375
376
377
378 int 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';
397
398 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
399
400 CODA_FREE(inp, insize);
401 return error;
402 }
403
404 int 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
433 error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
434
435 CODA_FREE(inp, insize);
436 return error;
437 }
438
439 int 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
448 inp->coda_fsync.VFid = *fid;
449 error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs),
450 &outsize, inp);
451
452 CODA_FREE(inp, insize);
453 return error;
454 }
455
456 int 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
475 int 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 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
550 int 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 */
575 static 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
589 static 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 & REQ_READ))
607
608 static inline void coda_waitfor_upcall(struct upc_req *req)
609 {
610 DECLARE_WAITQUEUE(wait, current);
611 unsigned long timeout = jiffies + coda_timeout * HZ;
612 sigset_t old;
613 int blocked;
614
615 coda_block_signals(&old);
616 blocked = 1;
617
618 add_wait_queue(&req->uc_sleep, &wait);
619 for (;;) {
620 if (CODA_INTERRUPTIBLE(req))
621 set_current_state(TASK_INTERRUPTIBLE);
622 else
623 set_current_state(TASK_UNINTERRUPTIBLE);
624
625 /* got a reply */
626 if (req->uc_flags & (REQ_WRITE | REQ_ABORT))
627 break;
628
629 if (blocked && time_after(jiffies, timeout) &&
630 CODA_INTERRUPTIBLE(req))
631 {
632 coda_unblock_signals(&old);
633 blocked = 0;
634 }
635
636 if (signal_pending(current)) {
637 list_del(&req->uc_chain);
638 break;
639 }
640
641 if (blocked)
642 schedule_timeout(HZ);
643 else
644 schedule();
645 }
646 if (blocked)
647 coda_unblock_signals(&old);
648
649 remove_wait_queue(&req->uc_sleep, &wait);
650 set_current_state(TASK_RUNNING);
651 }
652
653
654 /*
655 * coda_upcall will return an error in the case of
656 * failed communication with Venus _or_ will peek at Venus
657 * reply and return Venus' error.
658 *
659 * As venus has 2 types of errors, normal errors (positive) and internal
660 * errors (negative), normal errors are negated, while internal errors
661 * are all mapped to -EINTR, while showing a nice warning message. (jh)
662 */
663 static int coda_upcall(struct venus_comm *vcp,
664 int inSize, int *outSize,
665 union inputArgs *buffer)
666 {
667 union outputArgs *out;
668 union inputArgs *sig_inputArgs;
669 struct upc_req *req, *sig_req;
670 int error = 0;
671
672 if (!vcp->vc_inuse) {
673 printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n");
674 return -ENXIO;
675 }
676
677 /* Format the request message. */
678 req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
679 if (!req)
680 return -ENOMEM;
681
682 req->uc_data = (void *)buffer;
683 req->uc_flags = 0;
684 req->uc_inSize = inSize;
685 req->uc_outSize = *outSize ? *outSize : inSize;
686 req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
687 req->uc_unique = ++vcp->vc_seq;
688 init_waitqueue_head(&req->uc_sleep);
689
690 /* Fill in the common input args. */
691 ((union inputArgs *)buffer)->ih.unique = req->uc_unique;
692
693 /* Append msg to pending queue and poke Venus. */
694 list_add_tail(&req->uc_chain, &vcp->vc_pending);
695
696 wake_up_interruptible(&vcp->vc_waitq);
697 /* We can be interrupted while we wait for Venus to process
698 * our request. If the interrupt occurs before Venus has read
699 * the request, we dequeue and return. If it occurs after the
700 * read but before the reply, we dequeue, send a signal
701 * message, and return. If it occurs after the reply we ignore
702 * it. In no case do we want to restart the syscall. If it
703 * was interrupted by a venus shutdown (psdev_close), return
704 * ENODEV. */
705
706 /* Go to sleep. Wake up on signals only after the timeout. */
707 coda_waitfor_upcall(req);
708
709 /* Op went through, interrupt or not... */
710 if (req->uc_flags & REQ_WRITE) {
711 out = (union outputArgs *)req->uc_data;
712 /* here we map positive Venus errors to kernel errors */
713 error = -out->oh.result;
714 *outSize = req->uc_outSize;
715 goto exit;
716 }
717
718 error = -EINTR;
719 if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) {
720 printk(KERN_WARNING "coda: Unexpected interruption.\n");
721 goto exit;
722 }
723
724 /* Interrupted before venus read it. */
725 if (!(req->uc_flags & REQ_READ))
726 goto exit;
727
728 /* Venus saw the upcall, make sure we can send interrupt signal */
729 if (!vcp->vc_inuse) {
730 printk(KERN_INFO "coda: Venus dead, not sending signal.\n");
731 goto exit;
732 }
733
734 error = -ENOMEM;
735 sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
736 if (!sig_req) goto exit;
737
738 CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
739 if (!sig_req->uc_data) {
740 kfree(sig_req);
741 goto exit;
742 }
743
744 error = -EINTR;
745 sig_inputArgs = (union inputArgs *)sig_req->uc_data;
746 sig_inputArgs->ih.opcode = CODA_SIGNAL;
747 sig_inputArgs->ih.unique = req->uc_unique;
748
749 sig_req->uc_flags = REQ_ASYNC;
750 sig_req->uc_opcode = sig_inputArgs->ih.opcode;
751 sig_req->uc_unique = sig_inputArgs->ih.unique;
752 sig_req->uc_inSize = sizeof(struct coda_in_hdr);
753 sig_req->uc_outSize = sizeof(struct coda_in_hdr);
754
755 /* insert at head of queue! */
756 list_add(&(sig_req->uc_chain), &vcp->vc_pending);
757 wake_up_interruptible(&vcp->vc_waitq);
758
759 exit:
760 kfree(req);
761 return error;
762 }
763
764 /*
765 The statements below are part of the Coda opportunistic
766 programming -- taken from the Mach/BSD kernel code for Coda.
767 You don't get correct semantics by stating what needs to be
768 done without guaranteeing the invariants needed for it to happen.
769 When will be have time to find out what exactly is going on? (pjb)
770 */
771
772
773 /*
774 * There are 7 cases where cache invalidations occur. The semantics
775 * of each is listed here:
776 *
777 * CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
778 * CODA_PURGEUSER -- flush all entries from the name cache for a specific user
779 * This call is a result of token expiration.
780 *
781 * The next arise as the result of callbacks on a file or directory.
782 * CODA_ZAPFILE -- flush the cached attributes for a file.
783
784 * CODA_ZAPDIR -- flush the attributes for the dir and
785 * force a new lookup for all the children
786 of this dir.
787
788 *
789 * The next is a result of Venus detecting an inconsistent file.
790 * CODA_PURGEFID -- flush the attribute for the file
791 * purge it and its children from the dcache
792 *
793 * The last allows Venus to replace local fids with global ones
794 * during reintegration.
795 *
796 * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */
797
798 int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
799 {
800 struct inode *inode = NULL;
801 struct CodaFid *fid, *newfid;
802
803 /* Handle invalidation requests. */
804 if ( !sb || !sb->s_root)
805 return 0;
806
807 switch (opcode) {
808 case CODA_FLUSH:
809 coda_cache_clear_all(sb);
810 shrink_dcache_sb(sb);
811 if (sb->s_root->d_inode)
812 coda_flag_inode(sb->s_root->d_inode, C_FLUSH);
813 break;
814
815 case CODA_PURGEUSER:
816 coda_cache_clear_all(sb);
817 break;
818
819 case CODA_ZAPDIR:
820 fid = &out->coda_zapdir.CodaFid;
821 inode = coda_fid_to_inode(fid, sb);
822 if (inode) {
823 coda_flag_inode_children(inode, C_PURGE);
824 coda_flag_inode(inode, C_VATTR);
825 }
826 break;
827
828 case CODA_ZAPFILE:
829 fid = &out->coda_zapfile.CodaFid;
830 inode = coda_fid_to_inode(fid, sb);
831 if (inode)
832 coda_flag_inode(inode, C_VATTR);
833 break;
834
835 case CODA_PURGEFID:
836 fid = &out->coda_purgefid.CodaFid;
837 inode = coda_fid_to_inode(fid, sb);
838 if (inode) {
839 coda_flag_inode_children(inode, C_PURGE);
840
841 /* catch the dentries later if some are still busy */
842 coda_flag_inode(inode, C_PURGE);
843 d_prune_aliases(inode);
844
845 }
846 break;
847
848 case CODA_REPLACE:
849 fid = &out->coda_replace.OldFid;
850 newfid = &out->coda_replace.NewFid;
851 inode = coda_fid_to_inode(fid, sb);
852 if (inode)
853 coda_replace_fid(inode, fid, newfid);
854 break;
855 }
856
857 if (inode)
858 iput(inode);
859
860 return 0;
861 }
862
863
|
This page was automatically generated by the
LXR engine.
|