1 |
/* |
2 |
FUSE: Filesystem in Userspace |
3 |
Copyright (C) 2001-2004 Miklos Szeredi <miklos@szeredi.hu> |
4 |
|
5 |
This program can be distributed under the terms of the GNU LGPL. |
6 |
See the file COPYING.LIB |
7 |
*/ |
8 |
|
9 |
#include <config.h> |
10 |
#include "fuse_i.h" |
11 |
#include <linux/fuse.h> |
12 |
|
13 |
#include <string.h> |
14 |
#include <stdlib.h> |
15 |
#include <unistd.h> |
16 |
#include <limits.h> |
17 |
#include <errno.h> |
18 |
#include <sys/param.h> |
19 |
|
20 |
#define FUSE_MAX_PATH 4096 |
21 |
#define PARAM(inarg) (((char *)(inarg)) + sizeof(*inarg)) |
22 |
|
23 |
#define ENTRY_REVALIDATE_TIME 1 /* sec */ |
24 |
#define ATTR_REVALIDATE_TIME 1 /* sec */ |
25 |
|
26 |
static const char *opname(enum fuse_opcode opcode) |
27 |
{ |
28 |
switch (opcode) { |
29 |
case FUSE_LOOKUP: return "LOOKUP"; |
30 |
case FUSE_FORGET: return "FORGET"; |
31 |
case FUSE_GETATTR: return "GETATTR"; |
32 |
case FUSE_SETATTR: return "SETATTR"; |
33 |
case FUSE_READLINK: return "READLINK"; |
34 |
case FUSE_SYMLINK: return "SYMLINK"; |
35 |
case FUSE_GETDIR: return "GETDIR"; |
36 |
case FUSE_MKNOD: return "MKNOD"; |
37 |
case FUSE_MKDIR: return "MKDIR"; |
38 |
case FUSE_UNLINK: return "UNLINK"; |
39 |
case FUSE_RMDIR: return "RMDIR"; |
40 |
case FUSE_RENAME: return "RENAME"; |
41 |
case FUSE_LINK: return "LINK"; |
42 |
case FUSE_OPEN: return "OPEN"; |
43 |
case FUSE_READ: return "READ"; |
44 |
case FUSE_WRITE: return "WRITE"; |
45 |
case FUSE_STATFS: return "STATFS"; |
46 |
case FUSE_FLUSH: return "FLUSH"; |
47 |
case FUSE_RELEASE: return "RELEASE"; |
48 |
case FUSE_FSYNC: return "FSYNC"; |
49 |
case FUSE_SETXATTR: return "SETXATTR"; |
50 |
case FUSE_GETXATTR: return "GETXATTR"; |
51 |
case FUSE_LISTXATTR: return "LISTXATTR"; |
52 |
case FUSE_REMOVEXATTR: return "REMOVEXATTR"; |
53 |
default: return "???"; |
54 |
} |
55 |
} |
56 |
|
57 |
|
58 |
static inline void dec_avail(struct fuse *f) |
59 |
{ |
60 |
pthread_mutex_lock(&f->lock); |
61 |
f->numavail --; |
62 |
pthread_mutex_unlock(&f->lock); |
63 |
} |
64 |
|
65 |
static struct node *__get_node(struct fuse *f, fino_t ino) |
66 |
{ |
67 |
size_t hash = ino % f->ino_table_size; |
68 |
struct node *node; |
69 |
|
70 |
for (node = f->ino_table[hash]; node != NULL; node = node->ino_next) |
71 |
if (node->ino == ino) |
72 |
return node; |
73 |
|
74 |
return NULL; |
75 |
} |
76 |
|
77 |
static struct node *get_node(struct fuse *f, fino_t ino) |
78 |
{ |
79 |
struct node *node = __get_node(f, ino); |
80 |
if (node != NULL) |
81 |
return node; |
82 |
|
83 |
fprintf(stderr, "fuse internal error: inode %lu not found\n", ino); |
84 |
abort(); |
85 |
} |
86 |
|
87 |
static void hash_ino(struct fuse *f, struct node *node) |
88 |
{ |
89 |
size_t hash = node->ino % f->ino_table_size; |
90 |
node->ino_next = f->ino_table[hash]; |
91 |
f->ino_table[hash] = node; |
92 |
} |
93 |
|
94 |
static void unhash_ino(struct fuse *f, struct node *node) |
95 |
{ |
96 |
size_t hash = node->ino % f->ino_table_size; |
97 |
struct node **nodep = &f->ino_table[hash]; |
98 |
|
99 |
for (; *nodep != NULL; nodep = &(*nodep)->ino_next) |
100 |
if (*nodep == node) { |
101 |
*nodep = node->ino_next; |
102 |
return; |
103 |
} |
104 |
} |
105 |
|
106 |
static fino_t next_ino(struct fuse *f) |
107 |
{ |
108 |
do { |
109 |
f->ctr++; |
110 |
if (!f->ctr) |
111 |
f->generation ++; |
112 |
} while (f->ctr == 0 || __get_node(f, f->ctr) != NULL); |
113 |
return f->ctr; |
114 |
} |
115 |
|
116 |
static void free_node(struct node *node) |
117 |
{ |
118 |
free(node->name); |
119 |
free(node); |
120 |
} |
121 |
|
122 |
static unsigned int name_hash(struct fuse *f, fino_t parent, const char *name) |
123 |
{ |
124 |
unsigned int hash = *name; |
125 |
|
126 |
if (hash) |
127 |
for (name += 1; *name != '\0'; name++) |
128 |
hash = (hash << 5) - hash + *name; |
129 |
|
130 |
return (hash + parent) % f->name_table_size; |
131 |
} |
132 |
|
133 |
static struct node *__lookup_node(struct fuse *f, fino_t parent, |
134 |
const char *name) |
135 |
{ |
136 |
size_t hash = name_hash(f, parent, name); |
137 |
struct node *node; |
138 |
|
139 |
for (node = f->name_table[hash]; node != NULL; node = node->name_next) |
140 |
if (node->parent == parent && strcmp(node->name, name) == 0) |
141 |
return node; |
142 |
|
143 |
return NULL; |
144 |
} |
145 |
|
146 |
static struct node *lookup_node(struct fuse *f, fino_t parent, |
147 |
const char *name) |
148 |
{ |
149 |
struct node *node; |
150 |
|
151 |
pthread_mutex_lock(&f->lock); |
152 |
node = __lookup_node(f, parent, name); |
153 |
pthread_mutex_unlock(&f->lock); |
154 |
if (node != NULL) |
155 |
return node; |
156 |
|
157 |
fprintf(stderr, "fuse internal error: node %lu/%s not found\n", parent, |
158 |
name); |
159 |
abort(); |
160 |
} |
161 |
|
162 |
static void hash_name(struct fuse *f, struct node *node, fino_t parent, |
163 |
const char *name) |
164 |
{ |
165 |
size_t hash = name_hash(f, parent, name); |
166 |
node->parent = parent; |
167 |
node->name = strdup(name); |
168 |
node->name_next = f->name_table[hash]; |
169 |
f->name_table[hash] = node; |
170 |
} |
171 |
|
172 |
static void unhash_name(struct fuse *f, struct node *node) |
173 |
{ |
174 |
if (node->name != NULL) { |
175 |
size_t hash = name_hash(f, node->parent, node->name); |
176 |
struct node **nodep = &f->name_table[hash]; |
177 |
|
178 |
for (; *nodep != NULL; nodep = &(*nodep)->name_next) |
179 |
if (*nodep == node) { |
180 |
*nodep = node->name_next; |
181 |
node->name_next = NULL; |
182 |
free(node->name); |
183 |
node->name = NULL; |
184 |
node->parent = 0; |
185 |
return; |
186 |
} |
187 |
fprintf(stderr, "fuse internal error: unable to unhash node: %lu\n", |
188 |
node->ino); |
189 |
abort(); |
190 |
} |
191 |
} |
192 |
|
193 |
static struct node *find_node(struct fuse *f, fino_t parent, char *name, |
194 |
struct fuse_attr *attr, int version) |
195 |
{ |
196 |
struct node *node; |
197 |
int mode = attr->mode & S_IFMT; |
198 |
int rdev = 0; |
199 |
|
200 |
if (S_ISCHR(mode) || S_ISBLK(mode)) |
201 |
rdev = attr->rdev; |
202 |
|
203 |
pthread_mutex_lock(&f->lock); |
204 |
node = __lookup_node(f, parent, name); |
205 |
if (node != NULL) { |
206 |
if (node->mode == mode && node->rdev == rdev) |
207 |
goto out; |
208 |
|
209 |
unhash_name(f, node); |
210 |
} |
211 |
|
212 |
node = (struct node *) calloc(1, sizeof(struct node)); |
213 |
node->mode = mode; |
214 |
node->rdev = rdev; |
215 |
node->open_count = 0; |
216 |
node->is_hidden = 0; |
217 |
node->ino = next_ino(f); |
218 |
node->generation = f->generation; |
219 |
hash_ino(f, node); |
220 |
hash_name(f, node, parent, name); |
221 |
|
222 |
out: |
223 |
node->version = version; |
224 |
pthread_mutex_unlock(&f->lock); |
225 |
return node; |
226 |
} |
227 |
|
228 |
static int path_lookup(struct fuse *f, const char *path, fino_t *inop) |
229 |
{ |
230 |
fino_t ino; |
231 |
int err; |
232 |
char *s; |
233 |
char *name; |
234 |
char *tmp = strdup(path); |
235 |
if (!tmp) |
236 |
return -ENOMEM; |
237 |
|
238 |
pthread_mutex_lock(&f->lock); |
239 |
ino = FUSE_ROOT_INO; |
240 |
err = 0; |
241 |
for (s = tmp; (name = strsep(&s, "/")) != NULL; ) { |
242 |
if (name[0]) { |
243 |
struct node *node = __lookup_node(f, ino, name); |
244 |
if (node == NULL) { |
245 |
err = -ENOENT; |
246 |
break; |
247 |
} |
248 |
ino = node->ino; |
249 |
} |
250 |
} |
251 |
pthread_mutex_unlock(&f->lock); |
252 |
free(tmp); |
253 |
if (!err) |
254 |
*inop = ino; |
255 |
|
256 |
return err; |
257 |
} |
258 |
|
259 |
static char *add_name(char *buf, char *s, const char *name) |
260 |
{ |
261 |
size_t len = strlen(name); |
262 |
s -= len; |
263 |
if (s <= buf) { |
264 |
fprintf(stderr, "fuse: path too long: ...%s\n", s + len); |
265 |
return NULL; |
266 |
} |
267 |
strncpy(s, name, len); |
268 |
s--; |
269 |
*s = '/'; |
270 |
|
271 |
return s; |
272 |
} |
273 |
|
274 |
static char *get_path_name(struct fuse *f, fino_t ino, const char *name) |
275 |
{ |
276 |
char buf[FUSE_MAX_PATH]; |
277 |
char *s = buf + FUSE_MAX_PATH - 1; |
278 |
struct node *node; |
279 |
|
280 |
*s = '\0'; |
281 |
|
282 |
if (name != NULL) { |
283 |
s = add_name(buf, s, name); |
284 |
if (s == NULL) |
285 |
return NULL; |
286 |
} |
287 |
|
288 |
pthread_mutex_lock(&f->lock); |
289 |
for (node = get_node(f, ino); node->ino != FUSE_ROOT_INO; |
290 |
node = get_node(f, node->parent)) { |
291 |
if (node->name == NULL) { |
292 |
s = NULL; |
293 |
break; |
294 |
} |
295 |
|
296 |
s = add_name(buf, s, node->name); |
297 |
if (s == NULL) |
298 |
break; |
299 |
} |
300 |
pthread_mutex_unlock(&f->lock); |
301 |
|
302 |
if (s == NULL) |
303 |
return NULL; |
304 |
else if (*s == '\0') |
305 |
return strdup("/"); |
306 |
else |
307 |
return strdup(s); |
308 |
} |
309 |
|
310 |
static char *get_path(struct fuse *f, fino_t ino) |
311 |
{ |
312 |
return get_path_name(f, ino, NULL); |
313 |
} |
314 |
|
315 |
static void destroy_node(struct fuse *f, fino_t ino, int version) |
316 |
{ |
317 |
struct node *node; |
318 |
|
319 |
pthread_mutex_lock(&f->lock); |
320 |
node = get_node(f, ino); |
321 |
if (node->version == version && ino != FUSE_ROOT_INO) { |
322 |
unhash_name(f, node); |
323 |
unhash_ino(f, node); |
324 |
free_node(node); |
325 |
} |
326 |
pthread_mutex_unlock(&f->lock); |
327 |
|
328 |
} |
329 |
|
330 |
static void remove_node(struct fuse *f, fino_t dir, const char *name) |
331 |
{ |
332 |
struct node *node; |
333 |
|
334 |
pthread_mutex_lock(&f->lock); |
335 |
node = __lookup_node(f, dir, name); |
336 |
if (node == NULL) { |
337 |
fprintf(stderr, "fuse internal error: unable to remove node %lu/%s\n", |
338 |
dir, name); |
339 |
abort(); |
340 |
} |
341 |
unhash_name(f, node); |
342 |
pthread_mutex_unlock(&f->lock); |
343 |
} |
344 |
|
345 |
static int rename_node(struct fuse *f, fino_t olddir, const char *oldname, |
346 |
fino_t newdir, const char *newname, int hide) |
347 |
{ |
348 |
struct node *node; |
349 |
struct node *newnode; |
350 |
int err = 0; |
351 |
|
352 |
pthread_mutex_lock(&f->lock); |
353 |
node = __lookup_node(f, olddir, oldname); |
354 |
newnode = __lookup_node(f, newdir, newname); |
355 |
if (node == NULL) { |
356 |
fprintf(stderr, "fuse internal error: unable to rename node %lu/%s\n", |
357 |
olddir, oldname); |
358 |
abort(); |
359 |
} |
360 |
|
361 |
if (newnode != NULL) { |
362 |
if (hide) { |
363 |
fprintf(stderr, "fuse: hidden file got created during hiding\n"); |
364 |
err = -1; |
365 |
goto out; |
366 |
} |
367 |
unhash_name(f, newnode); |
368 |
} |
369 |
|
370 |
unhash_name(f, node); |
371 |
hash_name(f, node, newdir, newname); |
372 |
if (hide) |
373 |
node->is_hidden = 1; |
374 |
|
375 |
out: |
376 |
pthread_mutex_unlock(&f->lock); |
377 |
return err; |
378 |
} |
379 |
|
380 |
static void convert_stat(struct stat *stbuf, struct fuse_attr *attr) |
381 |
{ |
382 |
attr->mode = stbuf->st_mode; |
383 |
attr->nlink = stbuf->st_nlink; |
384 |
attr->uid = stbuf->st_uid; |
385 |
attr->gid = stbuf->st_gid; |
386 |
attr->rdev = stbuf->st_rdev; |
387 |
attr->size = stbuf->st_size; |
388 |
attr->blocks = stbuf->st_blocks; |
389 |
attr->atime = stbuf->st_atime; |
390 |
attr->mtime = stbuf->st_mtime; |
391 |
attr->ctime = stbuf->st_ctime; |
392 |
#ifdef HAVE_STRUCT_STAT_ST_ATIM |
393 |
attr->atimensec = stbuf->st_atim.tv_nsec; |
394 |
attr->mtimensec = stbuf->st_mtim.tv_nsec; |
395 |
attr->ctimensec = stbuf->st_ctim.tv_nsec; |
396 |
#endif |
397 |
} |
398 |
|
399 |
static int fill_dir(struct fuse_dirhandle *dh, char *name, int type) |
400 |
{ |
401 |
struct fuse_dirent dirent; |
402 |
size_t reclen; |
403 |
size_t res; |
404 |
|
405 |
dirent.ino = (unsigned long) -1; |
406 |
dirent.namelen = strlen(name); |
407 |
strncpy(dirent.name, name, sizeof(dirent.name)); |
408 |
dirent.type = type; |
409 |
reclen = FUSE_DIRENT_SIZE(&dirent); |
410 |
res = fwrite(&dirent, reclen, 1, dh->fp); |
411 |
if (res == 0) { |
412 |
perror("fuse: writing directory file"); |
413 |
return -EIO; |
414 |
} |
415 |
return 0; |
416 |
} |
417 |
|
418 |
static int send_reply_raw(struct fuse *f, char *outbuf, size_t outsize, |
419 |
int locked) |
420 |
{ |
421 |
int res; |
422 |
|
423 |
if ((f->flags & FUSE_DEBUG)) { |
424 |
struct fuse_out_header *out = (struct fuse_out_header *) outbuf; |
425 |
printf(" unique: %i, error: %i (%s), outsize: %i\n", out->unique, |
426 |
out->error, strerror(-out->error), outsize); |
427 |
fflush(stdout); |
428 |
} |
429 |
|
430 |
/* This needs to be done before the reply, otherwise the scheduler |
431 |
could play tricks with us, and only let the counter be increased |
432 |
long after the operation is done */ |
433 |
if (!locked) |
434 |
pthread_mutex_lock(&f->lock); |
435 |
f->numavail ++; |
436 |
if (!locked) |
437 |
pthread_mutex_unlock(&f->lock); |
438 |
|
439 |
res = write(f->fd, outbuf, outsize); |
440 |
if (res == -1) { |
441 |
/* ENOENT means the operation was interrupted */ |
442 |
if (!f->exited && errno != ENOENT) |
443 |
perror("fuse: writing device"); |
444 |
return -errno; |
445 |
} |
446 |
return 0; |
447 |
} |
448 |
|
449 |
static int __send_reply(struct fuse *f, struct fuse_in_header *in, int error, |
450 |
void *arg, size_t argsize, int locked) |
451 |
{ |
452 |
int res; |
453 |
char *outbuf; |
454 |
size_t outsize; |
455 |
struct fuse_out_header *out; |
456 |
|
457 |
if (error <= -1000 || error > 0) { |
458 |
fprintf(stderr, "fuse: bad error value: %i\n", error); |
459 |
error = -ERANGE; |
460 |
} |
461 |
|
462 |
if (error) |
463 |
argsize = 0; |
464 |
|
465 |
outsize = sizeof(struct fuse_out_header) + argsize; |
466 |
outbuf = (char *) malloc(outsize); |
467 |
out = (struct fuse_out_header *) outbuf; |
468 |
memset(out, 0, sizeof(struct fuse_out_header)); |
469 |
out->unique = in->unique; |
470 |
out->error = error; |
471 |
if (argsize != 0) |
472 |
memcpy(outbuf + sizeof(struct fuse_out_header), arg, argsize); |
473 |
|
474 |
res = send_reply_raw(f, outbuf, outsize, locked); |
475 |
free(outbuf); |
476 |
|
477 |
return res; |
478 |
} |
479 |
|
480 |
static int send_reply(struct fuse *f, struct fuse_in_header *in, int error, |
481 |
void *arg, size_t argsize) |
482 |
{ |
483 |
return __send_reply(f, in, error, arg, argsize, 0); |
484 |
} |
485 |
|
486 |
static int is_open(struct fuse *f, fino_t dir, const char *name) |
487 |
{ |
488 |
struct node *node; |
489 |
int isopen = 0; |
490 |
pthread_mutex_lock(&f->lock); |
491 |
node = __lookup_node(f, dir, name); |
492 |
if (node && node->open_count > 0) |
493 |
isopen = 1; |
494 |
pthread_mutex_unlock(&f->lock); |
495 |
return isopen; |
496 |
} |
497 |
|
498 |
static char *hidden_name(struct fuse *f, fino_t dir, const char *oldname, |
499 |
char *newname, size_t bufsize) |
500 |
{ |
501 |
struct stat buf; |
502 |
struct node *node; |
503 |
struct node *newnode; |
504 |
char *newpath; |
505 |
int res; |
506 |
int failctr = 10; |
507 |
|
508 |
if (!f->op.getattr) |
509 |
return NULL; |
510 |
|
511 |
do { |
512 |
node = lookup_node(f, dir, oldname); |
513 |
pthread_mutex_lock(&f->lock); |
514 |
do { |
515 |
f->hidectr ++; |
516 |
snprintf(newname, bufsize, ".fuse_hidden%08x%08x", |
517 |
(unsigned int) node->ino, f->hidectr); |
518 |
newnode = __lookup_node(f, dir, newname); |
519 |
} while(newnode); |
520 |
pthread_mutex_unlock(&f->lock); |
521 |
|
522 |
newpath = get_path_name(f, dir, newname); |
523 |
if (!newpath) |
524 |
break; |
525 |
|
526 |
res = f->op.getattr(newpath, &buf); |
527 |
if (res != 0) |
528 |
break; |
529 |
free(newpath); |
530 |
newpath = NULL; |
531 |
} while(--failctr); |
532 |
|
533 |
return newpath; |
534 |
} |
535 |
|
536 |
static int hide_node(struct fuse *f, const char *oldpath, fino_t dir, |
537 |
const char *oldname) |
538 |
{ |
539 |
char newname[64]; |
540 |
char *newpath; |
541 |
int err = -1; |
542 |
|
543 |
if (!f->op.rename || !f->op.unlink) |
544 |
return -EBUSY; |
545 |
|
546 |
newpath = hidden_name(f, dir, oldname, newname, sizeof(newname)); |
547 |
if (newpath) { |
548 |
err = f->op.rename(oldpath, newpath); |
549 |
if (!err) |
550 |
err = rename_node(f, dir, oldname, dir, newname, 1); |
551 |
free(newpath); |
552 |
} |
553 |
if (err) |
554 |
return -EBUSY; |
555 |
|
556 |
return 0; |
557 |
} |
558 |
|
559 |
static int lookup_path(struct fuse *f, fino_t ino, int version, char *name, |
560 |
const char *path, struct fuse_entry_out *arg) |
561 |
{ |
562 |
int res; |
563 |
struct stat buf; |
564 |
|
565 |
res = f->op.getattr(path, &buf); |
566 |
if (res == 0) { |
567 |
struct node *node; |
568 |
|
569 |
memset(arg, 0, sizeof(struct fuse_entry_out)); |
570 |
convert_stat(&buf, &arg->attr); |
571 |
node = find_node(f, ino, name, &arg->attr, version); |
572 |
arg->ino = node->ino; |
573 |
arg->generation = node->generation; |
574 |
arg->entry_valid = ENTRY_REVALIDATE_TIME; |
575 |
arg->entry_valid_nsec = 0; |
576 |
arg->attr_valid = ATTR_REVALIDATE_TIME; |
577 |
arg->attr_valid_nsec = 0; |
578 |
if (f->flags & FUSE_DEBUG) { |
579 |
printf(" INO: %li\n", arg->ino); |
580 |
fflush(stdout); |
581 |
} |
582 |
} |
583 |
return res; |
584 |
} |
585 |
|
586 |
static void do_lookup(struct fuse *f, struct fuse_in_header *in, char *name) |
587 |
{ |
588 |
int res; |
589 |
int res2; |
590 |
char *path; |
591 |
struct fuse_entry_out arg; |
592 |
|
593 |
res = -ENOENT; |
594 |
path = get_path_name(f, in->ino, name); |
595 |
if (path != NULL) { |
596 |
if (f->flags & FUSE_DEBUG) { |
597 |
printf("LOOKUP %s\n", path); |
598 |
fflush(stdout); |
599 |
} |
600 |
res = -ENOSYS; |
601 |
if (f->op.getattr) |
602 |
res = lookup_path(f, in->ino, in->unique, name, path, &arg); |
603 |
free(path); |
604 |
} |
605 |
res2 = send_reply(f, in, res, &arg, sizeof(arg)); |
606 |
if (res == 0 && res2 == -ENOENT) |
607 |
destroy_node(f, arg.ino, in->unique); |
608 |
} |
609 |
|
610 |
static void do_forget(struct fuse *f, struct fuse_in_header *in, |
611 |
struct fuse_forget_in *arg) |
612 |
{ |
613 |
if (f->flags & FUSE_DEBUG) { |
614 |
printf("FORGET %li/%i\n", in->ino, arg->version); |
615 |
fflush(stdout); |
616 |
} |
617 |
destroy_node(f, in->ino, arg->version); |
618 |
} |
619 |
|
620 |
static void do_getattr(struct fuse *f, struct fuse_in_header *in) |
621 |
{ |
622 |
int res; |
623 |
char *path; |
624 |
struct stat buf; |
625 |
struct fuse_attr_out arg; |
626 |
|
627 |
res = -ENOENT; |
628 |
path = get_path(f, in->ino); |
629 |
if (path != NULL) { |
630 |
res = -ENOSYS; |
631 |
if (f->op.getattr) |
632 |
res = f->op.getattr(path, &buf); |
633 |
free(path); |
634 |
} |
635 |
|
636 |
if (res == 0) { |
637 |
memset(&arg, 0, sizeof(struct fuse_attr_out)); |
638 |
arg.attr_valid = ATTR_REVALIDATE_TIME; |
639 |
arg.attr_valid_nsec = 0; |
640 |
convert_stat(&buf, &arg.attr); |
641 |
} |
642 |
|
643 |
send_reply(f, in, res, &arg, sizeof(arg)); |
644 |
} |
645 |
|
646 |
static int do_chmod(struct fuse *f, const char *path, struct fuse_attr *attr) |
647 |
{ |
648 |
int res; |
649 |
|
650 |
res = -ENOSYS; |
651 |
if (f->op.chmod) |
652 |
res = f->op.chmod(path, attr->mode); |
653 |
|
654 |
return res; |
655 |
} |
656 |
|
657 |
static int do_chown(struct fuse *f, const char *path, struct fuse_attr *attr, |
658 |
int valid) |
659 |
{ |
660 |
int res; |
661 |
uid_t uid = (valid & FATTR_UID) ? attr->uid : (uid_t) -1; |
662 |
gid_t gid = (valid & FATTR_GID) ? attr->gid : (gid_t) -1; |
663 |
|
664 |
res = -ENOSYS; |
665 |
if (f->op.chown) |
666 |
res = f->op.chown(path, uid, gid); |
667 |
|
668 |
return res; |
669 |
} |
670 |
|
671 |
static int do_truncate(struct fuse *f, const char *path, |
672 |
struct fuse_attr *attr) |
673 |
{ |
674 |
int res; |
675 |
|
676 |
res = -ENOSYS; |
677 |
if (f->op.truncate) |
678 |
res = f->op.truncate(path, attr->size); |
679 |
|
680 |
return res; |
681 |
} |
682 |
|
683 |
static int do_utime(struct fuse *f, const char *path, struct fuse_attr *attr) |
684 |
{ |
685 |
int res; |
686 |
struct utimbuf buf; |
687 |
buf.actime = attr->atime; |
688 |
buf.modtime = attr->mtime; |
689 |
res = -ENOSYS; |
690 |
if (f->op.utime) |
691 |
res = f->op.utime(path, &buf); |
692 |
|
693 |
return res; |
694 |
} |
695 |
|
696 |
static void do_setattr(struct fuse *f, struct fuse_in_header *in, |
697 |
struct fuse_setattr_in *arg) |
698 |
{ |
699 |
int res; |
700 |
char *path; |
701 |
int valid = arg->valid; |
702 |
struct fuse_attr *attr = &arg->attr; |
703 |
struct fuse_attr_out outarg; |
704 |
|
705 |
res = -ENOENT; |
706 |
path = get_path(f, in->ino); |
707 |
if (path != NULL) { |
708 |
res = -ENOSYS; |
709 |
if (f->op.getattr) { |
710 |
res = 0; |
711 |
if (!res && (valid & FATTR_MODE)) |
712 |
res = do_chmod(f, path, attr); |
713 |
if (!res && (valid & (FATTR_UID | FATTR_GID))) |
714 |
res = do_chown(f, path, attr, valid); |
715 |
if (!res && (valid & FATTR_SIZE)) |
716 |
res = do_truncate(f, path, attr); |
717 |
if (!res && (valid & (FATTR_ATIME | FATTR_MTIME)) == |
718 |
(FATTR_ATIME | FATTR_MTIME)) |
719 |
res = do_utime(f, path, attr); |
720 |
if (!res) { |
721 |
struct stat buf; |
722 |
res = f->op.getattr(path, &buf); |
723 |
if (!res) { |
724 |
memset(&outarg, 0, sizeof(struct fuse_attr_out)); |
725 |
outarg.attr_valid = ATTR_REVALIDATE_TIME; |
726 |
outarg.attr_valid_nsec = 0; |
727 |
convert_stat(&buf, &outarg.attr); |
728 |
} |
729 |
} |
730 |
} |
731 |
free(path); |
732 |
} |
733 |
send_reply(f, in, res, &outarg, sizeof(outarg)); |
734 |
} |
735 |
|
736 |
static void do_readlink(struct fuse *f, struct fuse_in_header *in) |
737 |
{ |
738 |
int res; |
739 |
char link[PATH_MAX + 1]; |
740 |
char *path; |
741 |
|
742 |
res = -ENOENT; |
743 |
path = get_path(f, in->ino); |
744 |
if (path != NULL) { |
745 |
res = -ENOSYS; |
746 |
if (f->op.readlink) |
747 |
res = f->op.readlink(path, link, sizeof(link)); |
748 |
free(path); |
749 |
} |
750 |
link[PATH_MAX] = '\0'; |
751 |
send_reply(f, in, res, link, res == 0 ? strlen(link) : 0); |
752 |
} |
753 |
|
754 |
static void do_getdir(struct fuse *f, struct fuse_in_header *in) |
755 |
{ |
756 |
int res; |
757 |
struct fuse_getdir_out arg; |
758 |
struct fuse_dirhandle dh; |
759 |
char *path; |
760 |
|
761 |
dh.fuse = f; |
762 |
dh.fp = tmpfile(); |
763 |
dh.dir = in->ino; |
764 |
res = -ENOENT; |
765 |
path = get_path(f, in->ino); |
766 |
if (path != NULL) { |
767 |
res = -ENOSYS; |
768 |
if (f->op.getdir) |
769 |
res = f->op.getdir(path, &dh, (fuse_dirfil_t) fill_dir); |
770 |
free(path); |
771 |
} |
772 |
fflush(dh.fp); |
773 |
|
774 |
memset(&arg, 0, sizeof(struct fuse_getdir_out)); |
775 |
arg.fd = fileno(dh.fp); |
776 |
send_reply(f, in, res, &arg, sizeof(arg)); |
777 |
fclose(dh.fp); |
778 |
} |
779 |
|
780 |
static void do_mknod(struct fuse *f, struct fuse_in_header *in, |
781 |
struct fuse_mknod_in *inarg) |
782 |
{ |
783 |
int res; |
784 |
int res2; |
785 |
char *path; |
786 |
char *name = PARAM(inarg); |
787 |
struct fuse_entry_out outarg; |
788 |
|
789 |
res = -ENOENT; |
790 |
path = get_path_name(f, in->ino, name); |
791 |
if (path != NULL) { |
792 |
if (f->flags & FUSE_DEBUG) { |
793 |
printf("MKNOD %s\n", path); |
794 |
fflush(stdout); |
795 |
} |
796 |
res = -ENOSYS; |
797 |
if (f->op.mknod && f->op.getattr) { |
798 |
res = f->op.mknod(path, inarg->mode, inarg->rdev); |
799 |
if (res == 0) |
800 |
res = lookup_path(f, in->ino, in->unique, name, path, &outarg); |
801 |
} |
802 |
free(path); |
803 |
} |
804 |
res2 = send_reply(f, in, res, &outarg, sizeof(outarg)); |
805 |
if (res == 0 && res2 == -ENOENT) |
806 |
destroy_node(f, outarg.ino, in->unique); |
807 |
} |
808 |
|
809 |
static void do_mkdir(struct fuse *f, struct fuse_in_header *in, |
810 |
struct fuse_mkdir_in *inarg) |
811 |
{ |
812 |
int res; |
813 |
int res2; |
814 |
char *path; |
815 |
char *name = PARAM(inarg); |
816 |
struct fuse_entry_out outarg; |
817 |
|
818 |
res = -ENOENT; |
819 |
path = get_path_name(f, in->ino, name); |
820 |
if (path != NULL) { |
821 |
if (f->flags & FUSE_DEBUG) { |
822 |
printf("MKDIR %s\n", path); |
823 |
fflush(stdout); |
824 |
} |
825 |
res = -ENOSYS; |
826 |
if (f->op.mkdir && f->op.getattr) { |
827 |
res = f->op.mkdir(path, inarg->mode); |
828 |
if (res == 0) |
829 |
res = lookup_path(f, in->ino, in->unique, name, path, &outarg); |
830 |
} |
831 |
free(path); |
832 |
} |
833 |
res2 = send_reply(f, in, res, &outarg, sizeof(outarg)); |
834 |
if (res == 0 && res2 == -ENOENT) |
835 |
destroy_node(f, outarg.ino, in->unique); |
836 |
} |
837 |
|
838 |
static void do_unlink(struct fuse *f, struct fuse_in_header *in, char *name) |
839 |
{ |
840 |
int res; |
841 |
char *path; |
842 |
|
843 |
res = -ENOENT; |
844 |
path = get_path_name(f, in->ino, name); |
845 |
if (path != NULL) { |
846 |
if (f->flags & FUSE_DEBUG) { |
847 |
printf("UNLINK %s\n", path); |
848 |
fflush(stdout); |
849 |
} |
850 |
res = -ENOSYS; |
851 |
if (f->op.unlink) { |
852 |
if (!(f->flags & FUSE_HARD_REMOVE) && is_open(f, in->ino, name)) |
853 |
res = hide_node(f, path, in->ino, name); |
854 |
else { |
855 |
res = f->op.unlink(path); |
856 |
if (res == 0) |
857 |
remove_node(f, in->ino, name); |
858 |
} |
859 |
} |
860 |
free(path); |
861 |
} |
862 |
send_reply(f, in, res, NULL, 0); |
863 |
} |
864 |
|
865 |
static void do_rmdir(struct fuse *f, struct fuse_in_header *in, char *name) |
866 |
{ |
867 |
int res; |
868 |
char *path; |
869 |
|
870 |
res = -ENOENT; |
871 |
path = get_path_name(f, in->ino, name); |
872 |
if (path != NULL) { |
873 |
if (f->flags & FUSE_DEBUG) { |
874 |
printf("RMDIR %s\n", path); |
875 |
fflush(stdout); |
876 |
} |
877 |
res = -ENOSYS; |
878 |
if (f->op.rmdir) { |
879 |
res = f->op.rmdir(path); |
880 |
if (res == 0) |
881 |
remove_node(f, in->ino, name); |
882 |
} |
883 |
free(path); |
884 |
} |
885 |
send_reply(f, in, res, NULL, 0); |
886 |
} |
887 |
|
888 |
static void do_symlink(struct fuse *f, struct fuse_in_header *in, char *name, |
889 |
char *link) |
890 |
{ |
891 |
int res; |
892 |
int res2; |
893 |
char *path; |
894 |
struct fuse_entry_out outarg; |
895 |
|
896 |
res = -ENOENT; |
897 |
path = get_path_name(f, in->ino, name); |
898 |
if (path != NULL) { |
899 |
if (f->flags & FUSE_DEBUG) { |
900 |
printf("SYMLINK %s\n", path); |
901 |
fflush(stdout); |
902 |
} |
903 |
res = -ENOSYS; |
904 |
if (f->op.symlink && f->op.getattr) { |
905 |
res = f->op.symlink(link, path); |
906 |
if (res == 0) |
907 |
res = lookup_path(f, in->ino, in->unique, name, path, &outarg); |
908 |
} |
909 |
free(path); |
910 |
} |
911 |
res2 = send_reply(f, in, res, &outarg, sizeof(outarg)); |
912 |
if (res == 0 && res2 == -ENOENT) |
913 |
destroy_node(f, outarg.ino, in->unique); |
914 |
|
915 |
} |
916 |
|
917 |
static void do_rename(struct fuse *f, struct fuse_in_header *in, |
918 |
struct fuse_rename_in *inarg) |
919 |
{ |
920 |
int res; |
921 |
fino_t olddir = in->ino; |
922 |
fino_t newdir = inarg->newdir; |
923 |
char *oldname = PARAM(inarg); |
924 |
char *newname = oldname + strlen(oldname) + 1; |
925 |
char *oldpath; |
926 |
char *newpath; |
927 |
|
928 |
res = -ENOENT; |
929 |
oldpath = get_path_name(f, olddir, oldname); |
930 |
if (oldpath != NULL) { |
931 |
newpath = get_path_name(f, newdir, newname); |
932 |
if (newpath != NULL) { |
933 |
if (f->flags & FUSE_DEBUG) { |
934 |
printf("RENAME %s -> %s\n", oldpath, newpath); |
935 |
fflush(stdout); |
936 |
} |
937 |
res = -ENOSYS; |
938 |
if (f->op.rename) { |
939 |
res = 0; |
940 |
if (!(f->flags & FUSE_HARD_REMOVE) && |
941 |
is_open(f, newdir, newname)) |
942 |
res = hide_node(f, newpath, newdir, newname); |
943 |
if (res == 0) { |
944 |
res = f->op.rename(oldpath, newpath); |
945 |
if (res == 0) |
946 |
rename_node(f, olddir, oldname, newdir, newname, 0); |
947 |
} |
948 |
} |
949 |
free(newpath); |
950 |
} |
951 |
free(oldpath); |
952 |
} |
953 |
send_reply(f, in, res, NULL, 0); |
954 |
} |
955 |
|
956 |
static void do_link(struct fuse *f, struct fuse_in_header *in, |
957 |
struct fuse_link_in *arg) |
958 |
{ |
959 |
int res; |
960 |
int res2; |
961 |
char *oldpath; |
962 |
char *newpath; |
963 |
char *name = PARAM(arg); |
964 |
struct fuse_entry_out outarg; |
965 |
|
966 |
res = -ENOENT; |
967 |
oldpath = get_path(f, in->ino); |
968 |
if (oldpath != NULL) { |
969 |
newpath = get_path_name(f, arg->newdir, name); |
970 |
if (newpath != NULL) { |
971 |
if (f->flags & FUSE_DEBUG) { |
972 |
printf("LINK %s\n", newpath); |
973 |
fflush(stdout); |
974 |
} |
975 |
res = -ENOSYS; |
976 |
if (f->op.link && f->op.getattr) { |
977 |
res = f->op.link(oldpath, newpath); |
978 |
if (res == 0) |
979 |
res = lookup_path(f, arg->newdir, in->unique, name, |
980 |
newpath, &outarg); |
981 |
} |
982 |
free(newpath); |
983 |
} |
984 |
free(oldpath); |
985 |
} |
986 |
res2 = send_reply(f, in, res, &outarg, sizeof(outarg)); |
987 |
if (res == 0 && res2 == -ENOENT) |
988 |
destroy_node(f, outarg.ino, in->unique); |
989 |
} |
990 |
|
991 |
static void do_open(struct fuse *f, struct fuse_in_header *in, |
992 |
struct fuse_open_in *arg) |
993 |
{ |
994 |
int res; |
995 |
char *path; |
996 |
struct fuse_open_out outarg; |
997 |
|
998 |
res = -ENOENT; |
999 |
path = get_path(f, in->ino); |
1000 |
if (path != NULL) { |
1001 |
res = -ENOSYS; |
1002 |
if (f->op.open) |
1003 |
res = f->op.open(path, arg->flags); |
1004 |
} |
1005 |
if (res == 0) { |
1006 |
int res2; |
1007 |
|
1008 |
/* If the request is interrupted the lock must be held until |
1009 |
the cancellation is finished. Otherwise there could be |
1010 |
races with rename/unlink, against which the kernel can't |
1011 |
protect */ |
1012 |
pthread_mutex_lock(&f->lock); |
1013 |
f->fh_ctr ++; |
1014 |
outarg.fh = f->fh_ctr; |
1015 |
if (f->flags & FUSE_DEBUG) { |
1016 |
printf("OPEN[%u] flags: 0x%x\n", outarg.fh, arg->flags); |
1017 |
fflush(stdout); |
1018 |
} |
1019 |
|
1020 |
res2 = __send_reply(f, in, res, &outarg, sizeof(outarg), 1); |
1021 |
if(res2 == -ENOENT) { |
1022 |
/* The open syscall was interrupted, so it must be cancelled */ |
1023 |
if(f->op.release) |
1024 |
f->op.release(path, arg->flags); |
1025 |
} else |
1026 |
get_node(f, in->ino)->open_count ++; |
1027 |
pthread_mutex_unlock(&f->lock); |
1028 |
|
1029 |
} else |
1030 |
send_reply(f, in, res, NULL, 0); |
1031 |
|
1032 |
if (path) |
1033 |
free(path); |
1034 |
} |
1035 |
|
1036 |
static void do_flush(struct fuse *f, struct fuse_in_header *in, |
1037 |
struct fuse_flush_in *arg) |
1038 |
{ |
1039 |
char *path; |
1040 |
int res; |
1041 |
|
1042 |
res = -ENOENT; |
1043 |
path = get_path(f, in->ino); |
1044 |
if (path != NULL) { |
1045 |
if (f->flags & FUSE_DEBUG) { |
1046 |
printf("FLUSH[%u]\n", arg->fh); |
1047 |
fflush(stdout); |
1048 |
} |
1049 |
res = -ENOSYS; |
1050 |
if (f->op.flush) |
1051 |
res = f->op.flush(path); |
1052 |
free(path); |
1053 |
} |
1054 |
send_reply(f, in, res, NULL, 0); |
1055 |
} |
1056 |
|
1057 |
static void do_release(struct fuse *f, struct fuse_in_header *in, |
1058 |
struct fuse_release_in *arg) |
1059 |
{ |
1060 |
struct node *node; |
1061 |
char *path; |
1062 |
|
1063 |
pthread_mutex_lock(&f->lock); |
1064 |
node = get_node(f, in->ino); |
1065 |
--node->open_count; |
1066 |
pthread_mutex_unlock(&f->lock); |
1067 |
|
1068 |
path = get_path(f, in->ino); |
1069 |
if (path != NULL) { |
1070 |
if (f->flags & FUSE_DEBUG) { |
1071 |
printf("RELEASE[%u]\n", arg->fh); |
1072 |
fflush(stdout); |
1073 |
} |
1074 |
if (f->op.release) |
1075 |
f->op.release(path, arg->flags); |
1076 |
|
1077 |
if(node->is_hidden && node->open_count == 0) |
1078 |
/* can now clean up this hidden file */ |
1079 |
f->op.unlink(path); |
1080 |
|
1081 |
free(path); |
1082 |
} |
1083 |
send_reply(f, in, 0, NULL, 0); |
1084 |
} |
1085 |
|
1086 |
static void do_read(struct fuse *f, struct fuse_in_header *in, |
1087 |
struct fuse_read_in *arg) |
1088 |
{ |
1089 |
int res; |
1090 |
char *path; |
1091 |
char *outbuf = (char *) malloc(sizeof(struct fuse_out_header) + arg->size); |
1092 |
struct fuse_out_header *out = (struct fuse_out_header *) outbuf; |
1093 |
char *buf = outbuf + sizeof(struct fuse_out_header); |
1094 |
size_t size; |
1095 |
size_t outsize; |
1096 |
|
1097 |
res = -ENOENT; |
1098 |
path = get_path(f, in->ino); |
1099 |
if (path != NULL) { |
1100 |
if (f->flags & FUSE_DEBUG) { |
1101 |
printf("READ[%u] %u bytes from %llu\n", arg->fh, arg->size, |
1102 |
arg->offset); |
1103 |
fflush(stdout); |
1104 |
} |
1105 |
|
1106 |
res = -ENOSYS; |
1107 |
if (f->op.read) |
1108 |
res = f->op.read(path, buf, arg->size, arg->offset); |
1109 |
free(path); |
1110 |
} |
1111 |
|
1112 |
size = 0; |
1113 |
if (res >= 0) { |
1114 |
size = res; |
1115 |
res = 0; |
1116 |
if (f->flags & FUSE_DEBUG) { |
1117 |
printf(" READ[%u] %u bytes\n", arg->fh, size); |
1118 |
fflush(stdout); |
1119 |
} |
1120 |
} |
1121 |
memset(out, 0, sizeof(struct fuse_out_header)); |
1122 |
out->unique = in->unique; |
1123 |
out->error = res; |
1124 |
outsize = sizeof(struct fuse_out_header) + size; |
1125 |
|
1126 |
send_reply_raw(f, outbuf, outsize, 0); |
1127 |
free(outbuf); |
1128 |
} |
1129 |
|
1130 |
static void do_write(struct fuse *f, struct fuse_in_header *in, |
1131 |
struct fuse_write_in *arg) |
1132 |
{ |
1133 |
int res; |
1134 |
char *path; |
1135 |
struct fuse_write_out outarg; |
1136 |
|
1137 |
res = -ENOENT; |
1138 |
path = get_path(f, in->ino); |
1139 |
if (path != NULL) { |
1140 |
if (f->flags & FUSE_DEBUG) { |
1141 |
printf("WRITE%s[%u] %u bytes to %llu\n", |
1142 |
arg->writepage ? "PAGE" : "", arg->fh, arg->size, |
1143 |
arg->offset); |
1144 |
fflush(stdout); |
1145 |
} |
1146 |
|
1147 |
res = -ENOSYS; |
1148 |
if (f->op.write) |
1149 |
res = f->op.write(path, PARAM(arg), arg->size, arg->offset); |
1150 |
free(path); |
1151 |
} |
1152 |
|
1153 |
if (res >= 0) { |
1154 |
outarg.size = res; |
1155 |
res = 0; |
1156 |
} |
1157 |
|
1158 |
send_reply(f, in, res, &outarg, sizeof(outarg)); |
1159 |
} |
1160 |
|
1161 |
static int default_statfs(struct statfs *buf) |
1162 |
{ |
1163 |
buf->f_namelen = 255; |
1164 |
buf->f_bsize = 512; |
1165 |
return 0; |
1166 |
} |
1167 |
|
1168 |
static void convert_statfs(struct statfs *statfs, struct fuse_kstatfs *kstatfs) |
1169 |
{ |
1170 |
kstatfs->bsize = statfs->f_bsize; |
1171 |
kstatfs->blocks = statfs->f_blocks; |
1172 |
kstatfs->bfree = statfs->f_bfree; |
1173 |
kstatfs->bavail = statfs->f_bavail; |
1174 |
kstatfs->files = statfs->f_files; |
1175 |
kstatfs->ffree = statfs->f_ffree; |
1176 |
kstatfs->namelen = statfs->f_namelen; |
1177 |
} |
1178 |
|
1179 |
static void do_statfs(struct fuse *f, struct fuse_in_header *in) |
1180 |
{ |
1181 |
int res; |
1182 |
struct fuse_statfs_out arg; |
1183 |
struct statfs buf; |
1184 |
|
1185 |
memset(&buf, 0, sizeof(struct statfs)); |
1186 |
if (f->op.statfs) |
1187 |
res = f->op.statfs("/", &buf); |
1188 |
else |
1189 |
res = default_statfs(&buf); |
1190 |
|
1191 |
if (res == 0) |
1192 |
convert_statfs(&buf, &arg.st); |
1193 |
|
1194 |
send_reply(f, in, res, &arg, sizeof(arg)); |
1195 |
} |
1196 |
|
1197 |
static void do_fsync(struct fuse *f, struct fuse_in_header *in, |
1198 |
struct fuse_fsync_in *inarg) |
1199 |
{ |
1200 |
int res; |
1201 |
char *path; |
1202 |
|
1203 |
res = -ENOENT; |
1204 |
path = get_path(f, in->ino); |
1205 |
if (path != NULL) { |
1206 |
if (f->flags & FUSE_DEBUG) { |
1207 |
printf("FSYNC[%u]\n", inarg->fh); |
1208 |
fflush(stdout); |
1209 |
} |
1210 |
res = -ENOSYS; |
1211 |
if (f->op.fsync) |
1212 |
res = f->op.fsync(path, inarg->datasync); |
1213 |
free(path); |
1214 |
} |
1215 |
send_reply(f, in, res, NULL, 0); |
1216 |
} |
1217 |
|
1218 |
static void do_setxattr(struct fuse *f, struct fuse_in_header *in, |
1219 |
struct fuse_setxattr_in *arg) |
1220 |
{ |
1221 |
int res; |
1222 |
char *path; |
1223 |
char *name = PARAM(arg); |
1224 |
unsigned char *value = name + strlen(name) + 1; |
1225 |
|
1226 |
res = -ENOENT; |
1227 |
path = get_path(f, in->ino); |
1228 |
if (path != NULL) { |
1229 |
res = -ENOSYS; |
1230 |
if (f->op.setxattr) |
1231 |
res = f->op.setxattr(path, name, value, arg->size, arg->flags); |
1232 |
free(path); |
1233 |
} |
1234 |
send_reply(f, in, res, NULL, 0); |
1235 |
} |
1236 |
|
1237 |
static int common_getxattr(struct fuse *f, struct fuse_in_header *in, |
1238 |
const char *name, char *value, size_t size) |
1239 |
{ |
1240 |
int res; |
1241 |
char *path; |
1242 |
|
1243 |
res = -ENOENT; |
1244 |
path = get_path(f, in->ino); |
1245 |
if (path != NULL) { |
1246 |
res = -ENOSYS; |
1247 |
if (f->op.getxattr) |
1248 |
res = f->op.getxattr(path, name, value, size); |
1249 |
free(path); |
1250 |
} |
1251 |
return res; |
1252 |
} |
1253 |
|
1254 |
static void do_getxattr_read(struct fuse *f, struct fuse_in_header *in, |
1255 |
const char *name, size_t size) |
1256 |
{ |
1257 |
int res; |
1258 |
char *outbuf = (char *) malloc(sizeof(struct fuse_out_header) + size); |
1259 |
struct fuse_out_header *out = (struct fuse_out_header *) outbuf; |
1260 |
char *value = outbuf + sizeof(struct fuse_out_header); |
1261 |
|
1262 |
res = common_getxattr(f, in, name, value, size); |
1263 |
size = 0; |
1264 |
if (res > 0) { |
1265 |
size = res; |
1266 |
res = 0; |
1267 |
} |
1268 |
memset(out, 0, sizeof(struct fuse_out_header)); |
1269 |
out->unique = in->unique; |
1270 |
out->error = res; |
1271 |
|
1272 |
send_reply_raw(f, outbuf, sizeof(struct fuse_out_header) + size, 0); |
1273 |
free(outbuf); |
1274 |
} |
1275 |
|
1276 |
static void do_getxattr_size(struct fuse *f, struct fuse_in_header *in, |
1277 |
const char *name) |
1278 |
{ |
1279 |
int res; |
1280 |
struct fuse_getxattr_out arg; |
1281 |
|
1282 |
res = common_getxattr(f, in, name, NULL, 0); |
1283 |
if (res >= 0) { |
1284 |
arg.size = res; |
1285 |
res = 0; |
1286 |
} |
1287 |
send_reply(f, in, res, &arg, sizeof(arg)); |
1288 |
} |
1289 |
|
1290 |
static void do_getxattr(struct fuse *f, struct fuse_in_header *in, |
1291 |
struct fuse_getxattr_in *arg) |
1292 |
{ |
1293 |
char *name = PARAM(arg); |
1294 |
|
1295 |
if (arg->size) |
1296 |
do_getxattr_read(f, in, name, arg->size); |
1297 |
else |
1298 |
do_getxattr_size(f, in, name); |
1299 |
} |
1300 |
|
1301 |
static int common_listxattr(struct fuse *f, struct fuse_in_header *in, |
1302 |
char *list, size_t size) |
1303 |
{ |
1304 |
int res; |
1305 |
char *path; |
1306 |
|
1307 |
res = -ENOENT; |
1308 |
path = get_path(f, in->ino); |
1309 |
if (path != NULL) { |
1310 |
res = -ENOSYS; |
1311 |
if (f->op.listxattr) |
1312 |
res = f->op.listxattr(path, list, size); |
1313 |
free(path); |
1314 |
} |
1315 |
return res; |
1316 |
} |
1317 |
|
1318 |
static void do_listxattr_read(struct fuse *f, struct fuse_in_header *in, |
1319 |
size_t size) |
1320 |
{ |
1321 |
int res; |
1322 |
char *outbuf = (char *) malloc(sizeof(struct fuse_out_header) + size); |
1323 |
struct fuse_out_header *out = (struct fuse_out_header *) outbuf; |
1324 |
char *list = outbuf + sizeof(struct fuse_out_header); |
1325 |
|
1326 |
res = common_listxattr(f, in, list, size); |
1327 |
size = 0; |
1328 |
if (res > 0) { |
1329 |
size = res; |
1330 |
res = 0; |
1331 |
} |
1332 |
memset(out, 0, sizeof(struct fuse_out_header)); |
1333 |
out->unique = in->unique; |
1334 |
out->error = res; |
1335 |
|
1336 |
send_reply_raw(f, outbuf, sizeof(struct fuse_out_header) + size, 0); |
1337 |
free(outbuf); |
1338 |
} |
1339 |
|
1340 |
static void do_listxattr_size(struct fuse *f, struct fuse_in_header *in) |
1341 |
{ |
1342 |
int res; |
1343 |
struct fuse_getxattr_out arg; |
1344 |
|
1345 |
res = common_listxattr(f, in, NULL, 0); |
1346 |
if (res >= 0) { |
1347 |
arg.size = res; |
1348 |
res = 0; |
1349 |
} |
1350 |
send_reply(f, in, res, &arg, sizeof(arg)); |
1351 |
} |
1352 |
|
1353 |
static void do_listxattr(struct fuse *f, struct fuse_in_header *in, |
1354 |
struct fuse_getxattr_in *arg) |
1355 |
{ |
1356 |
if (arg->size) |
1357 |
do_listxattr_read(f, in, arg->size); |
1358 |
else |
1359 |
do_listxattr_size(f, in); |
1360 |
} |
1361 |
|
1362 |
static void do_removexattr(struct fuse *f, struct fuse_in_header *in, |
1363 |
char *name) |
1364 |
{ |
1365 |
int res; |
1366 |
char *path; |
1367 |
|
1368 |
res = -ENOENT; |
1369 |
path = get_path(f, in->ino); |
1370 |
if (path != NULL) { |
1371 |
res = -ENOSYS; |
1372 |
if (f->op.removexattr) |
1373 |
res = f->op.removexattr(path, name); |
1374 |
free(path); |
1375 |
} |
1376 |
send_reply(f, in, res, NULL, 0); |
1377 |
} |
1378 |
|
1379 |
|
1380 |
static void free_cmd(struct fuse_cmd *cmd) |
1381 |
{ |
1382 |
free(cmd->buf); |
1383 |
free(cmd); |
1384 |
} |
1385 |
|
1386 |
void __fuse_process_cmd(struct fuse *f, struct fuse_cmd *cmd) |
1387 |
{ |
1388 |
struct fuse_in_header *in = (struct fuse_in_header *) cmd->buf; |
1389 |
void *inarg = cmd->buf + sizeof(struct fuse_in_header); |
1390 |
size_t argsize; |
1391 |
struct fuse_context *ctx = fuse_get_context(f); |
1392 |
|
1393 |
dec_avail(f); |
1394 |
|
1395 |
if ((f->flags & FUSE_DEBUG)) { |
1396 |
printf("unique: %i, opcode: %s (%i), ino: %li, insize: %i\n", |
1397 |
in->unique, opname(in->opcode), in->opcode, in->ino, |
1398 |
cmd->buflen); |
1399 |
fflush(stdout); |
1400 |
} |
1401 |
|
1402 |
ctx->uid = in->uid; |
1403 |
ctx->gid = in->gid; |
1404 |
|
1405 |
argsize = cmd->buflen - sizeof(struct fuse_in_header); |
1406 |
|
1407 |
switch (in->opcode) { |
1408 |
case FUSE_LOOKUP: |
1409 |
do_lookup(f, in, (char *) inarg); |
1410 |
break; |
1411 |
|
1412 |
case FUSE_GETATTR: |
1413 |
do_getattr(f, in); |
1414 |
break; |
1415 |
|
1416 |
case FUSE_SETATTR: |
1417 |
do_setattr(f, in, (struct fuse_setattr_in *) inarg); |
1418 |
break; |
1419 |
|
1420 |
case FUSE_READLINK: |
1421 |
do_readlink(f, in); |
1422 |
break; |
1423 |
|
1424 |
case FUSE_GETDIR: |
1425 |
do_getdir(f, in); |
1426 |
break; |
1427 |
|
1428 |
case FUSE_MKNOD: |
1429 |
do_mknod(f, in, (struct fuse_mknod_in *) inarg); |
1430 |
break; |
1431 |
|
1432 |
case FUSE_MKDIR: |
1433 |
do_mkdir(f, in, (struct fuse_mkdir_in *) inarg); |
1434 |
break; |
1435 |
|
1436 |
case FUSE_UNLINK: |
1437 |
do_unlink(f, in, (char *) inarg); |
1438 |
break; |
1439 |
|
1440 |
case FUSE_RMDIR: |
1441 |
do_rmdir(f, in, (char *) inarg); |
1442 |
break; |
1443 |
|
1444 |
case FUSE_SYMLINK: |
1445 |
do_symlink(f, in, (char *) inarg, |
1446 |
((char *) inarg) + strlen((char *) inarg) + 1); |
1447 |
break; |
1448 |
|
1449 |
case FUSE_RENAME: |
1450 |
do_rename(f, in, (struct fuse_rename_in *) inarg); |
1451 |
break; |
1452 |
|
1453 |
case FUSE_LINK: |
1454 |
do_link(f, in, (struct fuse_link_in *) inarg); |
1455 |
break; |
1456 |
|
1457 |
case FUSE_OPEN: |
1458 |
do_open(f, in, (struct fuse_open_in *) inarg); |
1459 |
break; |
1460 |
|
1461 |
case FUSE_FLUSH: |
1462 |
do_flush(f, in, (struct fuse_flush_in *) inarg); |
1463 |
break; |
1464 |
|
1465 |
case FUSE_RELEASE: |
1466 |
do_release(f, in, (struct fuse_release_in *) inarg); |
1467 |
break; |
1468 |
|
1469 |
case FUSE_READ: |
1470 |
do_read(f, in, (struct fuse_read_in *) inarg); |
1471 |
break; |
1472 |
|
1473 |
case FUSE_WRITE: |
1474 |
do_write(f, in, (struct fuse_write_in *) inarg); |
1475 |
break; |
1476 |
|
1477 |
case FUSE_STATFS: |
1478 |
do_statfs(f, in); |
1479 |
break; |
1480 |
|
1481 |
case FUSE_FSYNC: |
1482 |
do_fsync(f, in, (struct fuse_fsync_in *) inarg); |
1483 |
break; |
1484 |
|
1485 |
case FUSE_SETXATTR: |
1486 |
do_setxattr(f, in, (struct fuse_setxattr_in *) inarg); |
1487 |
break; |
1488 |
|
1489 |
case FUSE_GETXATTR: |
1490 |
do_getxattr(f, in, (struct fuse_getxattr_in *) inarg); |
1491 |
break; |
1492 |
|
1493 |
case FUSE_LISTXATTR: |
1494 |
do_listxattr(f, in, (struct fuse_getxattr_in *) inarg); |
1495 |
break; |
1496 |
|
1497 |
case FUSE_REMOVEXATTR: |
1498 |
do_removexattr(f, in, (char *) inarg); |
1499 |
break; |
1500 |
|
1501 |
default: |
1502 |
send_reply(f, in, -ENOSYS, NULL, 0); |
1503 |
} |
1504 |
|
1505 |
free_cmd(cmd); |
1506 |
} |
1507 |
|
1508 |
int __fuse_exited(struct fuse* f) |
1509 |
{ |
1510 |
return f->exited; |
1511 |
} |
1512 |
|
1513 |
struct fuse_cmd *__fuse_read_cmd(struct fuse *f) |
1514 |
{ |
1515 |
ssize_t res; |
1516 |
struct fuse_cmd *cmd; |
1517 |
struct fuse_in_header *in; |
1518 |
void *inarg; |
1519 |
|
1520 |
cmd = (struct fuse_cmd *) malloc(sizeof(struct fuse_cmd)); |
1521 |
cmd->buf = (char *) malloc(FUSE_MAX_IN); |
1522 |
in = (struct fuse_in_header *) cmd->buf; |
1523 |
inarg = cmd->buf + sizeof(struct fuse_in_header); |
1524 |
|
1525 |
res = read(f->fd, cmd->buf, FUSE_MAX_IN); |
1526 |
if (res == -1) { |
1527 |
free_cmd(cmd); |
1528 |
if (__fuse_exited(f) || errno == EINTR) |
1529 |
return NULL; |
1530 |
|
1531 |
/* ENODEV means we got unmounted, so we silenty return failure */ |
1532 |
if (errno != ENODEV) { |
1533 |
/* BAD... This will happen again */ |
1534 |
perror("fuse: reading device"); |
1535 |
} |
1536 |
|
1537 |
fuse_exit(f); |
1538 |
return NULL; |
1539 |
} |
1540 |
if ((size_t) res < sizeof(struct fuse_in_header)) { |
1541 |
free_cmd(cmd); |
1542 |
/* Cannot happen */ |
1543 |
fprintf(stderr, "short read on fuse device\n"); |
1544 |
fuse_exit(f); |
1545 |
return NULL; |
1546 |
} |
1547 |
cmd->buflen = res; |
1548 |
|
1549 |
/* Forget is special, it can be done without messing with threads. */ |
1550 |
if (in->opcode == FUSE_FORGET) { |
1551 |
do_forget(f, in, (struct fuse_forget_in *) inarg); |
1552 |
free_cmd(cmd); |
1553 |
return NULL; |
1554 |
} |
1555 |
|
1556 |
return cmd; |
1557 |
} |
1558 |
|
1559 |
void fuse_loop(struct fuse *f) |
1560 |
{ |
1561 |
if (f == NULL) |
1562 |
return; |
1563 |
|
1564 |
while (1) { |
1565 |
struct fuse_cmd *cmd; |
1566 |
|
1567 |
if (__fuse_exited(f)) |
1568 |
return; |
1569 |
|
1570 |
cmd = __fuse_read_cmd(f); |
1571 |
if (cmd == NULL) |
1572 |
continue; |
1573 |
|
1574 |
__fuse_process_cmd(f, cmd); |
1575 |
} |
1576 |
} |
1577 |
|
1578 |
int fuse_invalidate(struct fuse *f, const char *path) |
1579 |
{ |
1580 |
int res; |
1581 |
int err; |
1582 |
fino_t ino; |
1583 |
struct fuse_user_header h; |
1584 |
|
1585 |
err = path_lookup(f, path, &ino); |
1586 |
if (err) { |
1587 |
if (err == -ENOENT) |
1588 |
return 0; |
1589 |
else |
1590 |
return err; |
1591 |
} |
1592 |
|
1593 |
memset(&h, 0, sizeof(struct fuse_user_header)); |
1594 |
h.opcode = FUSE_INVALIDATE; |
1595 |
h.ino = ino; |
1596 |
|
1597 |
if ((f->flags & FUSE_DEBUG)) { |
1598 |
printf("INVALIDATE ino: %li\n", ino); |
1599 |
fflush(stdout); |
1600 |
} |
1601 |
|
1602 |
res = write(f->fd, &h, sizeof(struct fuse_user_header)); |
1603 |
if (res == -1) { |
1604 |
if (errno != ENOENT) { |
1605 |
perror("fuse: writing device"); |
1606 |
return -errno; |
1607 |
} |
1608 |
} |
1609 |
return 0; |
1610 |
} |
1611 |
|
1612 |
void fuse_exit(struct fuse *f) |
1613 |
{ |
1614 |
f->exited = 1; |
1615 |
} |
1616 |
|
1617 |
struct fuse_context *fuse_get_context(struct fuse *f) |
1618 |
{ |
1619 |
if (f->getcontext) |
1620 |
return f->getcontext(f); |
1621 |
else |
1622 |
return &f->context; |
1623 |
} |
1624 |
|
1625 |
static int check_version(struct fuse *f) |
1626 |
{ |
1627 |
int res; |
1628 |
FILE *vf = fopen(FUSE_VERSION_FILE, "r"); |
1629 |
if (vf == NULL) { |
1630 |
fprintf(stderr, "fuse: kernel interface too old, need >= %i.%i\n", |
1631 |
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1632 |
return -1; |
1633 |
} |
1634 |
res = fscanf(vf, "%i.%i", &f->majorver, &f->minorver); |
1635 |
fclose(vf); |
1636 |
if (res != 2) { |
1637 |
fprintf(stderr, "fuse: error reading %s\n", FUSE_VERSION_FILE); |
1638 |
return -1; |
1639 |
} |
1640 |
if (f->majorver != FUSE_KERNEL_VERSION) { |
1641 |
fprintf(stderr, "fuse: bad kernel interface major version: needs %i\n", |
1642 |
FUSE_KERNEL_VERSION); |
1643 |
return -1; |
1644 |
} |
1645 |
if (f->minorver < FUSE_KERNEL_MINOR_VERSION) { |
1646 |
fprintf(stderr, "fuse: kernel interface too old: need >= %i.%i", |
1647 |
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
1648 |
return -1; |
1649 |
} |
1650 |
|
1651 |
return 0; |
1652 |
} |
1653 |
|
1654 |
|
1655 |
int fuse_is_lib_option(const char *opt) |
1656 |
{ |
1657 |
if (strcmp(opt, "debug") == 0 || |
1658 |
strcmp(opt, "hard_remove") == 0) |
1659 |
return 1; |
1660 |
else |
1661 |
return 0; |
1662 |
} |
1663 |
|
1664 |
static void parse_lib_opts(struct fuse *f, const char *opts) |
1665 |
{ |
1666 |
if (opts) { |
1667 |
char *xopts = strdup(opts); |
1668 |
char *s = xopts; |
1669 |
char *opt; |
1670 |
|
1671 |
while((opt = strsep(&s, ","))) { |
1672 |
if (strcmp(opt, "debug") == 0) |
1673 |
f->flags |= FUSE_DEBUG; |
1674 |
else if (strcmp(opt, "hard_remove") == 0) |
1675 |
f->flags |= FUSE_HARD_REMOVE; |
1676 |
else |
1677 |
fprintf(stderr, "fuse: warning: unknown option `%s'\n", opt); |
1678 |
} |
1679 |
free(xopts); |
1680 |
} |
1681 |
} |
1682 |
|
1683 |
struct fuse *fuse_new(int fd, const char *opts, const struct fuse_operations *op) |
1684 |
{ |
1685 |
struct fuse *f; |
1686 |
struct node *root; |
1687 |
|
1688 |
f = (struct fuse *) calloc(1, sizeof(struct fuse)); |
1689 |
|
1690 |
if (check_version(f) == -1) { |
1691 |
free(f); |
1692 |
return NULL; |
1693 |
} |
1694 |
|
1695 |
parse_lib_opts(f, opts); |
1696 |
f->fd = fd; |
1697 |
f->ctr = 0; |
1698 |
f->generation = 0; |
1699 |
/* FIXME: Dynamic hash table */ |
1700 |
f->name_table_size = 14057; |
1701 |
f->name_table = (struct node **) |
1702 |
calloc(1, sizeof(struct node *) * f->name_table_size); |
1703 |
f->ino_table_size = 14057; |
1704 |
f->ino_table = (struct node **) |
1705 |
calloc(1, sizeof(struct node *) * f->ino_table_size); |
1706 |
pthread_mutex_init(&f->lock, NULL); |
1707 |
f->numworker = 0; |
1708 |
f->numavail = 0; |
1709 |
f->op = *op; |
1710 |
f->getcontext = NULL; |
1711 |
f->context.uid = 0; |
1712 |
f->context.gid = 0; |
1713 |
f->exited = 0; |
1714 |
|
1715 |
root = (struct node *) calloc(1, sizeof(struct node)); |
1716 |
root->mode = 0; |
1717 |
root->rdev = 0; |
1718 |
root->name = strdup("/"); |
1719 |
root->parent = 0; |
1720 |
root->ino = FUSE_ROOT_INO; |
1721 |
root->generation = 0; |
1722 |
hash_ino(f, root); |
1723 |
|
1724 |
return f; |
1725 |
} |
1726 |
|
1727 |
void fuse_destroy(struct fuse *f) |
1728 |
{ |
1729 |
size_t i; |
1730 |
for (i = 0; i < f->ino_table_size; i++) { |
1731 |
struct node *node; |
1732 |
|
1733 |
for (node = f->ino_table[i]; node != NULL; node = node->ino_next) { |
1734 |
if (node->is_hidden) { |
1735 |
char *path = get_path(f, node->ino); |
1736 |
if (path) |
1737 |
f->op.unlink(path); |
1738 |
} |
1739 |
} |
1740 |
} |
1741 |
for (i = 0; i < f->ino_table_size; i++) { |
1742 |
struct node *node; |
1743 |
struct node *next; |
1744 |
|
1745 |
for (node = f->ino_table[i]; node != NULL; node = next) { |
1746 |
next = node->ino_next; |
1747 |
free_node(node); |
1748 |
} |
1749 |
} |
1750 |
free(f->ino_table); |
1751 |
free(f->name_table); |
1752 |
pthread_mutex_destroy(&f->lock); |
1753 |
free(f); |
1754 |
} |