Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Mostly platform independent upcall operations to Venus: | |
3 | * -- upcalls | |
4 | * -- upcall routines | |
5 | * | |
6 | * Linux 2.0 version | |
7 | * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>, | |
8 | * Michael Callahan <callahan@maths.ox.ac.uk> | |
9 | * | |
10 | * Redone for Linux 2.1 | |
11 | * Copyright (C) 1997 Carnegie Mellon University | |
12 | * | |
13 | * Carnegie Mellon University encourages users of this code to contribute | |
14 | * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. | |
15 | */ | |
16 | ||
17 | #include <asm/system.h> | |
18 | #include <linux/signal.h> | |
e8edc6e0 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/file.h> | |
26 | #include <linux/stat.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/vfs.h> | |
32 | ||
33 | #include <linux/coda.h> | |
34 | #include <linux/coda_linux.h> | |
35 | #include <linux/coda_psdev.h> | |
36 | #include <linux/coda_fs_i.h> | |
37 | #include <linux/coda_cache.h> | |
3cf01f28 JH |
38 | |
39 | #include "coda_int.h" | |
1da177e4 | 40 | |
a1b0aa87 | 41 | static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize, |
1da177e4 LT |
42 | union inputArgs *buffer); |
43 | ||
44 | static void *alloc_upcall(int opcode, int size) | |
45 | { | |
46 | union inputArgs *inp; | |
47 | ||
48 | CODA_ALLOC(inp, union inputArgs *, size); | |
49 | if (!inp) | |
50 | return ERR_PTR(-ENOMEM); | |
51 | ||
52 | inp->ih.opcode = opcode; | |
53 | inp->ih.pid = current->pid; | |
a47afb0f | 54 | inp->ih.pgid = task_pgrp_nr(current); |
97b7702c | 55 | inp->ih.uid = current_fsuid(); |
de0ca06a | 56 | |
1da177e4 LT |
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 | ||
a1b0aa87 | 83 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb | 84 | if (!error) |
1da177e4 | 85 | *fidp = outp->coda_root.VFid; |
1da177e4 LT |
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 | ||
a1b0aa87 | 102 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
103 | if (!error) |
104 | *attr = outp->coda_getattr.attr; | |
1da177e4 LT |
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 | ||
a1b0aa87 | 123 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
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 | ||
a1b0aa87 | 149 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
150 | if (!error) { |
151 | *resfid = outp->coda_lookup.VFid; | |
152 | *type = outp->coda_lookup.vtype; | |
153 | } | |
1da177e4 LT |
154 | |
155 | CODA_FREE(inp, insize); | |
156 | return error; | |
157 | } | |
158 | ||
1da177e4 | 159 | int venus_close(struct super_block *sb, struct CodaFid *fid, int flags, |
d3fec424 | 160 | vuid_t uid) |
1da177e4 LT |
161 | { |
162 | union inputArgs *inp; | |
163 | union outputArgs *outp; | |
164 | int insize, outsize, error; | |
1da177e4 LT |
165 | |
166 | insize = SIZE(release); | |
167 | UPARG(CODA_CLOSE); | |
168 | ||
1da177e4 | 169 | inp->ih.uid = uid; |
1da177e4 LT |
170 | inp->coda_close.VFid = *fid; |
171 | inp->coda_close.flags = flags; | |
172 | ||
a1b0aa87 | 173 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
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 | ||
38c2e437 JH |
189 | inp->coda_open_by_fd.VFid = *fid; |
190 | inp->coda_open_by_fd.flags = flags; | |
1da177e4 | 191 | |
a1b0aa87 | 192 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
38c2e437 JH |
193 | if (!error) |
194 | *fh = outp->coda_open_by_fd.fh; | |
1da177e4 LT |
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'; | |
1da177e4 | 219 | |
a1b0aa87 | 220 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
221 | if (!error) { |
222 | *attrs = outp->coda_mkdir.attr; | |
223 | *newfid = outp->coda_mkdir.VFid; | |
224 | } | |
1da177e4 LT |
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 | ||
a1b0aa87 | 262 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
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'; | |
1da177e4 | 290 | |
a1b0aa87 | 291 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
292 | if (!error) { |
293 | *attrs = outp->coda_create.attr; | |
294 | *newfid = outp->coda_create.VFid; | |
295 | } | |
1da177e4 LT |
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'; | |
a1b0aa87 JH |
317 | |
318 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
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'; | |
a1b0aa87 JH |
339 | |
340 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
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; | |
970648eb | 360 | |
a1b0aa87 | 361 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
362 | if (!error) { |
363 | retlen = outp->coda_readlink.count; | |
1da177e4 | 364 | if ( retlen > *length ) |
970648eb | 365 | retlen = *length; |
1da177e4 LT |
366 | *length = retlen; |
367 | result = (char *)outp + (long)outp->coda_readlink.data; | |
368 | memcpy(buffer, result, retlen); | |
369 | *(buffer + retlen) = '\0'; | |
370 | } | |
970648eb | 371 | |
1da177e4 LT |
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'; | |
a1b0aa87 JH |
397 | |
398 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
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 | ||
a1b0aa87 | 433 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
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 | ||
a1b0aa87 JH |
448 | inp->coda_fsync.VFid = *fid; |
449 | error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs), | |
450 | &outsize, inp); | |
1da177e4 LT |
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 | ||
a1b0aa87 | 468 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
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 | ||
a1b0aa87 JH |
517 | error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size, |
518 | &outsize, inp); | |
519 | ||
1da177e4 LT |
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 | ||
726c3342 | 550 | int venus_statfs(struct dentry *dentry, struct kstatfs *sfs) |
1da177e4 LT |
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 | ||
a1b0aa87 | 559 | error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp); |
970648eb | 560 | if (!error) { |
1da177e4 LT |
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; | |
1da177e4 LT |
566 | } |
567 | ||
568 | CODA_FREE(inp, insize); | |
569 | return error; | |
570 | } | |
571 | ||
572 | /* | |
573 | * coda_upcall and coda_downcall routines. | |
1da177e4 | 574 | */ |
5f47c7ea | 575 | static void coda_block_signals(sigset_t *old) |
d9664c95 JH |
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 | ||
5f47c7ea | 589 | static void coda_unblock_signals(sigset_t *old) |
d9664c95 JH |
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)) | |
1da177e4 | 607 | |
d9664c95 | 608 | static inline void coda_waitfor_upcall(struct upc_req *req) |
1da177e4 LT |
609 | { |
610 | DECLARE_WAITQUEUE(wait, current); | |
d9664c95 JH |
611 | unsigned long timeout = jiffies + coda_timeout * HZ; |
612 | sigset_t old; | |
613 | int blocked; | |
1da177e4 | 614 | |
5f47c7ea | 615 | coda_block_signals(&old); |
d9664c95 | 616 | blocked = 1; |
1da177e4 | 617 | |
d9664c95 | 618 | add_wait_queue(&req->uc_sleep, &wait); |
1da177e4 | 619 | for (;;) { |
d9664c95 | 620 | if (CODA_INTERRUPTIBLE(req)) |
1da177e4 LT |
621 | set_current_state(TASK_INTERRUPTIBLE); |
622 | else | |
623 | set_current_state(TASK_UNINTERRUPTIBLE); | |
624 | ||
1da177e4 | 625 | /* got a reply */ |
d9664c95 | 626 | if (req->uc_flags & (REQ_WRITE | REQ_ABORT)) |
1da177e4 LT |
627 | break; |
628 | ||
d9664c95 JH |
629 | if (blocked && time_after(jiffies, timeout) && |
630 | CODA_INTERRUPTIBLE(req)) | |
631 | { | |
5f47c7ea | 632 | coda_unblock_signals(&old); |
d9664c95 | 633 | blocked = 0; |
1da177e4 | 634 | } |
d9664c95 JH |
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(); | |
1da177e4 | 645 | } |
d9664c95 | 646 | if (blocked) |
5f47c7ea | 647 | coda_unblock_signals(&old); |
1da177e4 | 648 | |
d9664c95 JH |
649 | remove_wait_queue(&req->uc_sleep, &wait); |
650 | set_current_state(TASK_RUNNING); | |
1da177e4 LT |
651 | } |
652 | ||
653 | ||
a1b0aa87 JH |
654 | /* |
655 | * coda_upcall will return an error in the case of | |
1da177e4 LT |
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) | |
1da177e4 | 662 | */ |
a1b0aa87 | 663 | static int coda_upcall(struct venus_comm *vcp, |
fe71b5f3 JH |
664 | int inSize, int *outSize, |
665 | union inputArgs *buffer) | |
1da177e4 | 666 | { |
1da177e4 | 667 | union outputArgs *out; |
fe71b5f3 JH |
668 | union inputArgs *sig_inputArgs; |
669 | struct upc_req *req, *sig_req; | |
1da177e4 LT |
670 | int error = 0; |
671 | ||
a1b0aa87 | 672 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
673 | printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n"); |
674 | return -ENXIO; | |
1da177e4 LT |
675 | } |
676 | ||
677 | /* Format the request message. */ | |
37461e19 | 678 | req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 | 679 | if (!req) |
1da177e4 | 680 | return -ENOMEM; |
fe71b5f3 | 681 | |
1da177e4 LT |
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; | |
a1b0aa87 | 687 | req->uc_unique = ++vcp->vc_seq; |
1da177e4 | 688 | init_waitqueue_head(&req->uc_sleep); |
fe71b5f3 | 689 | |
1da177e4 LT |
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. */ | |
a1b0aa87 | 694 | list_add_tail(&req->uc_chain, &vcp->vc_pending); |
fe71b5f3 | 695 | |
a1b0aa87 | 696 | wake_up_interruptible(&vcp->vc_waitq); |
1da177e4 LT |
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. */ | |
87065519 | 707 | coda_waitfor_upcall(req); |
1da177e4 | 708 | |
fe71b5f3 JH |
709 | /* Op went through, interrupt or not... */ |
710 | if (req->uc_flags & REQ_WRITE) { | |
1da177e4 LT |
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; | |
fe71b5f3 JH |
716 | } |
717 | ||
718 | error = -EINTR; | |
719 | if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) { | |
720 | printk(KERN_WARNING "coda: Unexpected interruption.\n"); | |
1da177e4 | 721 | goto exit; |
1da177e4 LT |
722 | } |
723 | ||
fe71b5f3 JH |
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 */ | |
a1b0aa87 | 729 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
730 | printk(KERN_INFO "coda: Venus dead, not sending signal.\n"); |
731 | goto exit; | |
732 | } | |
733 | ||
734 | error = -ENOMEM; | |
37461e19 | 735 | sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 JH |
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) { | |
37461e19 | 740 | kfree(sig_req); |
fe71b5f3 JH |
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! */ | |
a1b0aa87 JH |
756 | list_add(&(sig_req->uc_chain), &vcp->vc_pending); |
757 | wake_up_interruptible(&vcp->vc_waitq); | |
fe71b5f3 JH |
758 | |
759 | exit: | |
37461e19 | 760 | kfree(req); |
1da177e4 LT |
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 | { | |
5fd31e9a JH |
800 | struct inode *inode = NULL; |
801 | struct CodaFid *fid, *newfid; | |
802 | ||
1da177e4 | 803 | /* Handle invalidation requests. */ |
5fd31e9a JH |
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) { | |
1da177e4 LT |
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 | ||
5fd31e9a JH |
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; | |
1da177e4 LT |
861 | } |
862 |