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> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/vfs.h> | |
33 | ||
34 | #include <linux/coda.h> | |
35 | #include <linux/coda_linux.h> | |
36 | #include <linux/coda_psdev.h> | |
37 | #include <linux/coda_fs_i.h> | |
38 | #include <linux/coda_cache.h> | |
3cf01f28 JH |
39 | |
40 | #include "coda_int.h" | |
1da177e4 | 41 | |
a1b0aa87 | 42 | static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize, |
1da177e4 LT |
43 | union inputArgs *buffer); |
44 | ||
45 | static 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; | |
a47afb0f | 55 | inp->ih.pgid = task_pgrp_nr(current); |
97b7702c | 56 | inp->ih.uid = current_fsuid(); |
de0ca06a | 57 | |
1da177e4 LT |
58 | return (void*)inp; |
59 | } | |
60 | ||
61 | #define UPARG(op)\ | |
62 | do {\ | |
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 */ | |
75 | int 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 | ||
a1b0aa87 | 84 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb | 85 | if (!error) |
1da177e4 | 86 | *fidp = outp->coda_root.VFid; |
1da177e4 LT |
87 | |
88 | CODA_FREE(inp, insize); | |
89 | return error; | |
90 | } | |
91 | ||
92 | int 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 | ||
a1b0aa87 | 103 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
104 | if (!error) |
105 | *attr = outp->coda_getattr.attr; | |
1da177e4 LT |
106 | |
107 | CODA_FREE(inp, insize); | |
108 | return error; | |
109 | } | |
110 | ||
111 | int 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 | ||
a1b0aa87 | 124 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
125 | |
126 | CODA_FREE(inp, insize); | |
127 | return error; | |
128 | } | |
129 | ||
130 | int 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 | ||
a1b0aa87 | 150 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
151 | if (!error) { |
152 | *resfid = outp->coda_lookup.VFid; | |
153 | *type = outp->coda_lookup.vtype; | |
154 | } | |
1da177e4 LT |
155 | |
156 | CODA_FREE(inp, insize); | |
157 | return error; | |
158 | } | |
159 | ||
1da177e4 | 160 | int venus_close(struct super_block *sb, struct CodaFid *fid, int flags, |
d3fec424 | 161 | vuid_t uid) |
1da177e4 LT |
162 | { |
163 | union inputArgs *inp; | |
164 | union outputArgs *outp; | |
165 | int insize, outsize, error; | |
1da177e4 LT |
166 | |
167 | insize = SIZE(release); | |
168 | UPARG(CODA_CLOSE); | |
169 | ||
1da177e4 | 170 | inp->ih.uid = uid; |
1da177e4 LT |
171 | inp->coda_close.VFid = *fid; |
172 | inp->coda_close.flags = flags; | |
173 | ||
a1b0aa87 | 174 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
175 | |
176 | CODA_FREE(inp, insize); | |
177 | return error; | |
178 | } | |
179 | ||
180 | int 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 | ||
38c2e437 JH |
190 | inp->coda_open_by_fd.VFid = *fid; |
191 | inp->coda_open_by_fd.flags = flags; | |
1da177e4 | 192 | |
a1b0aa87 | 193 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
38c2e437 JH |
194 | if (!error) |
195 | *fh = outp->coda_open_by_fd.fh; | |
1da177e4 LT |
196 | |
197 | CODA_FREE(inp, insize); | |
198 | return error; | |
199 | } | |
200 | ||
201 | int 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'; | |
1da177e4 | 220 | |
a1b0aa87 | 221 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
222 | if (!error) { |
223 | *attrs = outp->coda_mkdir.attr; | |
224 | *newfid = outp->coda_mkdir.VFid; | |
225 | } | |
1da177e4 LT |
226 | |
227 | CODA_FREE(inp, insize); | |
228 | return error; | |
229 | } | |
230 | ||
231 | ||
232 | int 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 | ||
a1b0aa87 | 263 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
264 | |
265 | CODA_FREE(inp, insize); | |
266 | return error; | |
267 | } | |
268 | ||
269 | int 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'; | |
1da177e4 | 291 | |
a1b0aa87 | 292 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
293 | if (!error) { |
294 | *attrs = outp->coda_create.attr; | |
295 | *newfid = outp->coda_create.VFid; | |
296 | } | |
1da177e4 LT |
297 | |
298 | CODA_FREE(inp, insize); | |
299 | return error; | |
300 | } | |
301 | ||
302 | int 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'; | |
a1b0aa87 JH |
318 | |
319 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
320 | |
321 | CODA_FREE(inp, insize); | |
322 | return error; | |
323 | } | |
324 | ||
325 | int 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'; | |
a1b0aa87 JH |
340 | |
341 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
342 | |
343 | CODA_FREE(inp, insize); | |
344 | return error; | |
345 | } | |
346 | ||
347 | int 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; | |
970648eb | 361 | |
a1b0aa87 | 362 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
970648eb JH |
363 | if (!error) { |
364 | retlen = outp->coda_readlink.count; | |
1da177e4 | 365 | if ( retlen > *length ) |
970648eb | 366 | retlen = *length; |
1da177e4 LT |
367 | *length = retlen; |
368 | result = (char *)outp + (long)outp->coda_readlink.data; | |
369 | memcpy(buffer, result, retlen); | |
370 | *(buffer + retlen) = '\0'; | |
371 | } | |
970648eb | 372 | |
1da177e4 LT |
373 | CODA_FREE(inp, insize); |
374 | return error; | |
375 | } | |
376 | ||
377 | ||
378 | ||
379 | int 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'; | |
a1b0aa87 JH |
398 | |
399 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); | |
1da177e4 LT |
400 | |
401 | CODA_FREE(inp, insize); | |
402 | return error; | |
403 | } | |
404 | ||
405 | int 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 | ||
a1b0aa87 | 434 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
435 | |
436 | CODA_FREE(inp, insize); | |
437 | return error; | |
438 | } | |
439 | ||
440 | int 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 | ||
a1b0aa87 JH |
449 | inp->coda_fsync.VFid = *fid; |
450 | error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs), | |
451 | &outsize, inp); | |
1da177e4 LT |
452 | |
453 | CODA_FREE(inp, insize); | |
454 | return error; | |
455 | } | |
456 | ||
457 | int 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 | ||
a1b0aa87 | 469 | error = coda_upcall(coda_vcp(sb), insize, &outsize, inp); |
1da177e4 LT |
470 | |
471 | CODA_FREE(inp, insize); | |
472 | return error; | |
473 | } | |
474 | ||
475 | ||
476 | int 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 | ||
a1b0aa87 JH |
518 | error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size, |
519 | &outsize, inp); | |
520 | ||
1da177e4 LT |
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 | ||
726c3342 | 551 | int venus_statfs(struct dentry *dentry, struct kstatfs *sfs) |
1da177e4 LT |
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 | ||
a1b0aa87 | 560 | error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp); |
970648eb | 561 | if (!error) { |
1da177e4 LT |
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; | |
1da177e4 LT |
567 | } |
568 | ||
569 | CODA_FREE(inp, insize); | |
570 | return error; | |
571 | } | |
572 | ||
573 | /* | |
574 | * coda_upcall and coda_downcall routines. | |
1da177e4 | 575 | */ |
5f47c7ea | 576 | static void coda_block_signals(sigset_t *old) |
d9664c95 JH |
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 | ||
5f47c7ea | 590 | static void coda_unblock_signals(sigset_t *old) |
d9664c95 JH |
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 & REQ_READ)) | |
1da177e4 | 608 | |
d9664c95 | 609 | static inline void coda_waitfor_upcall(struct upc_req *req) |
1da177e4 LT |
610 | { |
611 | DECLARE_WAITQUEUE(wait, current); | |
d9664c95 JH |
612 | unsigned long timeout = jiffies + coda_timeout * HZ; |
613 | sigset_t old; | |
614 | int blocked; | |
1da177e4 | 615 | |
5f47c7ea | 616 | coda_block_signals(&old); |
d9664c95 | 617 | blocked = 1; |
1da177e4 | 618 | |
d9664c95 | 619 | add_wait_queue(&req->uc_sleep, &wait); |
1da177e4 | 620 | for (;;) { |
d9664c95 | 621 | if (CODA_INTERRUPTIBLE(req)) |
1da177e4 LT |
622 | set_current_state(TASK_INTERRUPTIBLE); |
623 | else | |
624 | set_current_state(TASK_UNINTERRUPTIBLE); | |
625 | ||
1da177e4 | 626 | /* got a reply */ |
d9664c95 | 627 | if (req->uc_flags & (REQ_WRITE | REQ_ABORT)) |
1da177e4 LT |
628 | break; |
629 | ||
d9664c95 JH |
630 | if (blocked && time_after(jiffies, timeout) && |
631 | CODA_INTERRUPTIBLE(req)) | |
632 | { | |
5f47c7ea | 633 | coda_unblock_signals(&old); |
d9664c95 | 634 | blocked = 0; |
1da177e4 | 635 | } |
d9664c95 JH |
636 | |
637 | if (signal_pending(current)) { | |
638 | list_del(&req->uc_chain); | |
639 | break; | |
640 | } | |
641 | ||
642 | if (blocked) | |
643 | schedule_timeout(HZ); | |
644 | else | |
645 | schedule(); | |
1da177e4 | 646 | } |
d9664c95 | 647 | if (blocked) |
5f47c7ea | 648 | coda_unblock_signals(&old); |
1da177e4 | 649 | |
d9664c95 JH |
650 | remove_wait_queue(&req->uc_sleep, &wait); |
651 | set_current_state(TASK_RUNNING); | |
1da177e4 LT |
652 | } |
653 | ||
654 | ||
a1b0aa87 JH |
655 | /* |
656 | * coda_upcall will return an error in the case of | |
1da177e4 LT |
657 | * failed communication with Venus _or_ will peek at Venus |
658 | * reply and return Venus' error. | |
659 | * | |
660 | * As venus has 2 types of errors, normal errors (positive) and internal | |
661 | * errors (negative), normal errors are negated, while internal errors | |
662 | * are all mapped to -EINTR, while showing a nice warning message. (jh) | |
1da177e4 | 663 | */ |
a1b0aa87 | 664 | static int coda_upcall(struct venus_comm *vcp, |
fe71b5f3 JH |
665 | int inSize, int *outSize, |
666 | union inputArgs *buffer) | |
1da177e4 | 667 | { |
1da177e4 | 668 | union outputArgs *out; |
fe71b5f3 JH |
669 | union inputArgs *sig_inputArgs; |
670 | struct upc_req *req, *sig_req; | |
1da177e4 LT |
671 | int error = 0; |
672 | ||
a1b0aa87 | 673 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
674 | printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n"); |
675 | return -ENXIO; | |
1da177e4 LT |
676 | } |
677 | ||
678 | /* Format the request message. */ | |
37461e19 | 679 | req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 | 680 | if (!req) |
1da177e4 | 681 | return -ENOMEM; |
fe71b5f3 | 682 | |
1da177e4 LT |
683 | req->uc_data = (void *)buffer; |
684 | req->uc_flags = 0; | |
685 | req->uc_inSize = inSize; | |
686 | req->uc_outSize = *outSize ? *outSize : inSize; | |
687 | req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode; | |
a1b0aa87 | 688 | req->uc_unique = ++vcp->vc_seq; |
1da177e4 | 689 | init_waitqueue_head(&req->uc_sleep); |
fe71b5f3 | 690 | |
1da177e4 LT |
691 | /* Fill in the common input args. */ |
692 | ((union inputArgs *)buffer)->ih.unique = req->uc_unique; | |
693 | ||
694 | /* Append msg to pending queue and poke Venus. */ | |
a1b0aa87 | 695 | list_add_tail(&req->uc_chain, &vcp->vc_pending); |
fe71b5f3 | 696 | |
a1b0aa87 | 697 | wake_up_interruptible(&vcp->vc_waitq); |
1da177e4 LT |
698 | /* We can be interrupted while we wait for Venus to process |
699 | * our request. If the interrupt occurs before Venus has read | |
700 | * the request, we dequeue and return. If it occurs after the | |
701 | * read but before the reply, we dequeue, send a signal | |
702 | * message, and return. If it occurs after the reply we ignore | |
703 | * it. In no case do we want to restart the syscall. If it | |
704 | * was interrupted by a venus shutdown (psdev_close), return | |
705 | * ENODEV. */ | |
706 | ||
707 | /* Go to sleep. Wake up on signals only after the timeout. */ | |
87065519 | 708 | coda_waitfor_upcall(req); |
1da177e4 | 709 | |
fe71b5f3 JH |
710 | /* Op went through, interrupt or not... */ |
711 | if (req->uc_flags & REQ_WRITE) { | |
1da177e4 LT |
712 | out = (union outputArgs *)req->uc_data; |
713 | /* here we map positive Venus errors to kernel errors */ | |
714 | error = -out->oh.result; | |
715 | *outSize = req->uc_outSize; | |
716 | goto exit; | |
fe71b5f3 JH |
717 | } |
718 | ||
719 | error = -EINTR; | |
720 | if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) { | |
721 | printk(KERN_WARNING "coda: Unexpected interruption.\n"); | |
1da177e4 | 722 | goto exit; |
1da177e4 LT |
723 | } |
724 | ||
fe71b5f3 JH |
725 | /* Interrupted before venus read it. */ |
726 | if (!(req->uc_flags & REQ_READ)) | |
727 | goto exit; | |
728 | ||
729 | /* Venus saw the upcall, make sure we can send interrupt signal */ | |
a1b0aa87 | 730 | if (!vcp->vc_inuse) { |
fe71b5f3 JH |
731 | printk(KERN_INFO "coda: Venus dead, not sending signal.\n"); |
732 | goto exit; | |
733 | } | |
734 | ||
735 | error = -ENOMEM; | |
37461e19 | 736 | sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL); |
fe71b5f3 JH |
737 | if (!sig_req) goto exit; |
738 | ||
739 | CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr)); | |
740 | if (!sig_req->uc_data) { | |
37461e19 | 741 | kfree(sig_req); |
fe71b5f3 JH |
742 | goto exit; |
743 | } | |
744 | ||
745 | error = -EINTR; | |
746 | sig_inputArgs = (union inputArgs *)sig_req->uc_data; | |
747 | sig_inputArgs->ih.opcode = CODA_SIGNAL; | |
748 | sig_inputArgs->ih.unique = req->uc_unique; | |
749 | ||
750 | sig_req->uc_flags = REQ_ASYNC; | |
751 | sig_req->uc_opcode = sig_inputArgs->ih.opcode; | |
752 | sig_req->uc_unique = sig_inputArgs->ih.unique; | |
753 | sig_req->uc_inSize = sizeof(struct coda_in_hdr); | |
754 | sig_req->uc_outSize = sizeof(struct coda_in_hdr); | |
755 | ||
756 | /* insert at head of queue! */ | |
a1b0aa87 JH |
757 | list_add(&(sig_req->uc_chain), &vcp->vc_pending); |
758 | wake_up_interruptible(&vcp->vc_waitq); | |
fe71b5f3 JH |
759 | |
760 | exit: | |
37461e19 | 761 | kfree(req); |
1da177e4 LT |
762 | return error; |
763 | } | |
764 | ||
765 | /* | |
766 | The statements below are part of the Coda opportunistic | |
767 | programming -- taken from the Mach/BSD kernel code for Coda. | |
768 | You don't get correct semantics by stating what needs to be | |
769 | done without guaranteeing the invariants needed for it to happen. | |
770 | When will be have time to find out what exactly is going on? (pjb) | |
771 | */ | |
772 | ||
773 | ||
774 | /* | |
775 | * There are 7 cases where cache invalidations occur. The semantics | |
776 | * of each is listed here: | |
777 | * | |
778 | * CODA_FLUSH -- flush all entries from the name cache and the cnode cache. | |
779 | * CODA_PURGEUSER -- flush all entries from the name cache for a specific user | |
780 | * This call is a result of token expiration. | |
781 | * | |
782 | * The next arise as the result of callbacks on a file or directory. | |
783 | * CODA_ZAPFILE -- flush the cached attributes for a file. | |
784 | ||
785 | * CODA_ZAPDIR -- flush the attributes for the dir and | |
786 | * force a new lookup for all the children | |
787 | of this dir. | |
788 | ||
789 | * | |
790 | * The next is a result of Venus detecting an inconsistent file. | |
791 | * CODA_PURGEFID -- flush the attribute for the file | |
792 | * purge it and its children from the dcache | |
793 | * | |
794 | * The last allows Venus to replace local fids with global ones | |
795 | * during reintegration. | |
796 | * | |
797 | * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */ | |
798 | ||
799 | int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb) | |
800 | { | |
5fd31e9a JH |
801 | struct inode *inode = NULL; |
802 | struct CodaFid *fid, *newfid; | |
803 | ||
1da177e4 | 804 | /* Handle invalidation requests. */ |
5fd31e9a JH |
805 | if ( !sb || !sb->s_root) |
806 | return 0; | |
807 | ||
808 | switch (opcode) { | |
809 | case CODA_FLUSH: | |
810 | coda_cache_clear_all(sb); | |
811 | shrink_dcache_sb(sb); | |
812 | if (sb->s_root->d_inode) | |
813 | coda_flag_inode(sb->s_root->d_inode, C_FLUSH); | |
814 | break; | |
815 | ||
816 | case CODA_PURGEUSER: | |
817 | coda_cache_clear_all(sb); | |
818 | break; | |
819 | ||
820 | case CODA_ZAPDIR: | |
821 | fid = &out->coda_zapdir.CodaFid; | |
822 | inode = coda_fid_to_inode(fid, sb); | |
823 | if (inode) { | |
824 | coda_flag_inode_children(inode, C_PURGE); | |
825 | coda_flag_inode(inode, C_VATTR); | |
826 | } | |
827 | break; | |
828 | ||
829 | case CODA_ZAPFILE: | |
830 | fid = &out->coda_zapfile.CodaFid; | |
831 | inode = coda_fid_to_inode(fid, sb); | |
832 | if (inode) | |
833 | coda_flag_inode(inode, C_VATTR); | |
834 | break; | |
835 | ||
836 | case CODA_PURGEFID: | |
837 | fid = &out->coda_purgefid.CodaFid; | |
838 | inode = coda_fid_to_inode(fid, sb); | |
839 | if (inode) { | |
1da177e4 LT |
840 | coda_flag_inode_children(inode, C_PURGE); |
841 | ||
842 | /* catch the dentries later if some are still busy */ | |
843 | coda_flag_inode(inode, C_PURGE); | |
844 | d_prune_aliases(inode); | |
845 | ||
5fd31e9a JH |
846 | } |
847 | break; | |
848 | ||
849 | case CODA_REPLACE: | |
850 | fid = &out->coda_replace.OldFid; | |
851 | newfid = &out->coda_replace.NewFid; | |
852 | inode = coda_fid_to_inode(fid, sb); | |
853 | if (inode) | |
854 | coda_replace_fid(inode, fid, newfid); | |
855 | break; | |
856 | } | |
857 | ||
858 | if (inode) | |
859 | iput(inode); | |
860 | ||
861 | return 0; | |
1da177e4 LT |
862 | } |
863 |