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Add ->flock() operation to low and high level interfaces
[fuse.git] / lib / fuse_lowlevel.c
blobb1015236c15f0a599da7e9e84973d880a20777fd
1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU LGPLv2.
6 See the file COPYING.LIB
7 */
8
9 #define _GNU_SOURCE
10
11 #include "fuse_i.h"
12 #include "fuse_kernel.h"
13 #include "fuse_opt.h"
14 #include "fuse_misc.h"
15 #include "fuse_common_compat.h"
16 #include "fuse_lowlevel_compat.h"
17
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <stddef.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <limits.h>
24 #include <errno.h>
25 #include <assert.h>
26
27 #ifndef F_LINUX_SPECIFIC_BASE
28 #define F_LINUX_SPECIFIC_BASE 1024
29 #endif
30 #ifndef F_SETPIPE_SZ
31 #define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
32 #endif
33
34
35 #define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg)))
36 #define OFFSET_MAX 0x7fffffffffffffffLL
37
38 #define container_of(ptr, type, member) ({ \
39 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
40 (type *)( (char *)__mptr - offsetof(type,member) );})
41
42 struct fuse_pollhandle {
43 uint64_t kh;
44 struct fuse_chan *ch;
45 struct fuse_ll *f;
46 };
47
48 static size_t pagesize;
49
50 static __attribute__((constructor)) void fuse_ll_init_pagesize(void)
51 {
52 pagesize = getpagesize();
53 }
54
55 static void convert_stat(const struct stat *stbuf, struct fuse_attr *attr)
56 {
57 attr->ino = stbuf->st_ino;
58 attr->mode = stbuf->st_mode;
59 attr->nlink = stbuf->st_nlink;
60 attr->uid = stbuf->st_uid;
61 attr->gid = stbuf->st_gid;
62 attr->rdev = stbuf->st_rdev;
63 attr->size = stbuf->st_size;
64 attr->blksize = stbuf->st_blksize;
65 attr->blocks = stbuf->st_blocks;
66 attr->atime = stbuf->st_atime;
67 attr->mtime = stbuf->st_mtime;
68 attr->ctime = stbuf->st_ctime;
69 attr->atimensec = ST_ATIM_NSEC(stbuf);
70 attr->mtimensec = ST_MTIM_NSEC(stbuf);
71 attr->ctimensec = ST_CTIM_NSEC(stbuf);
72 }
73
74 static void convert_attr(const struct fuse_setattr_in *attr, struct stat *stbuf)
75 {
76 stbuf->st_mode = attr->mode;
77 stbuf->st_uid = attr->uid;
78 stbuf->st_gid = attr->gid;
79 stbuf->st_size = attr->size;
80 stbuf->st_atime = attr->atime;
81 stbuf->st_mtime = attr->mtime;
82 ST_ATIM_NSEC_SET(stbuf, attr->atimensec);
83 ST_MTIM_NSEC_SET(stbuf, attr->mtimensec);
84 }
85
86 static size_t iov_length(const struct iovec *iov, size_t count)
87 {
88 size_t seg;
89 size_t ret = 0;
90
91 for (seg = 0; seg < count; seg++)
92 ret += iov[seg].iov_len;
93 return ret;
94 }
95
96 static void list_init_req(struct fuse_req *req)
97 {
98 req->next = req;
99 req->prev = req;
100 }
101
102 static void list_del_req(struct fuse_req *req)
103 {
104 struct fuse_req *prev = req->prev;
105 struct fuse_req *next = req->next;
106 prev->next = next;
107 next->prev = prev;
108 }
109
110 static void list_add_req(struct fuse_req *req, struct fuse_req *next)
111 {
112 struct fuse_req *prev = next->prev;
113 req->next = next;
114 req->prev = prev;
115 prev->next = req;
116 next->prev = req;
117 }
118
119 static void destroy_req(fuse_req_t req)
120 {
121 pthread_mutex_destroy(&req->lock);
122 free(req);
123 }
124
125 void fuse_free_req(fuse_req_t req)
126 {
127 int ctr;
128 struct fuse_ll *f = req->f;
129
130 pthread_mutex_lock(&f->lock);
131 req->u.ni.func = NULL;
132 req->u.ni.data = NULL;
133 list_del_req(req);
134 ctr = --req->ctr;
135 pthread_mutex_unlock(&f->lock);
136 if (!ctr)
137 destroy_req(req);
138 }
139
140 static struct fuse_req *fuse_ll_alloc_req(struct fuse_ll *f)
141 {
142 struct fuse_req *req;
143
144 req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
145 if (req == NULL) {
146 fprintf(stderr, "fuse: failed to allocate request\n");
147 } else {
148 req->f = f;
149 req->ctr = 1;
150 list_init_req(req);
151 fuse_mutex_init(&req->lock);
152 }
153
154 return req;
155 }
156
157
158 static int fuse_send_msg(struct fuse_ll *f, struct fuse_chan *ch,
159 struct iovec *iov, int count)
160 {
161 struct fuse_out_header *out = iov[0].iov_base;
162
163 out->len = iov_length(iov, count);
164 if (f->debug) {
165 if (out->unique == 0) {
166 fprintf(stderr, "NOTIFY: code=%d length=%u\n",
167 out->error, out->len);
168 } else if (out->error) {
169 fprintf(stderr,
170 " unique: %llu, error: %i (%s), outsize: %i\n",
171 (unsigned long long) out->unique, out->error,
172 strerror(-out->error), out->len);
173 } else {
174 fprintf(stderr,
175 " unique: %llu, success, outsize: %i\n",
176 (unsigned long long) out->unique, out->len);
177 }
178 }
179
180 return fuse_chan_send(ch, iov, count);
181 }
182
183 int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
184 int count)
185 {
186 struct fuse_out_header out;
187
188 if (error <= -1000 || error > 0) {
189 fprintf(stderr, "fuse: bad error value: %i\n", error);
190 error = -ERANGE;
191 }
192
193 out.unique = req->unique;
194 out.error = error;
195
196 iov[0].iov_base = &out;
197 iov[0].iov_len = sizeof(struct fuse_out_header);
198
199 return fuse_send_msg(req->f, req->ch, iov, count);
200 }
201
202 static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
203 int count)
204 {
205 int res;
206
207 res = fuse_send_reply_iov_nofree(req, error, iov, count);
208 fuse_free_req(req);
209 return res;
210 }
211
212 static int send_reply(fuse_req_t req, int error, const void *arg,
213 size_t argsize)
214 {
215 struct iovec iov[2];
216 int count = 1;
217 if (argsize) {
218 iov[1].iov_base = (void *) arg;
219 iov[1].iov_len = argsize;
220 count++;
221 }
222 return send_reply_iov(req, error, iov, count);
223 }
224
225 int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
226 {
227 int res;
228 struct iovec *padded_iov;
229
230 padded_iov = malloc((count + 1) * sizeof(struct iovec));
231 if (padded_iov == NULL)
232 return fuse_reply_err(req, ENOMEM);
233
234 memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
235 count++;
236
237 res = send_reply_iov(req, 0, padded_iov, count);
238 free(padded_iov);
239
240 return res;
241 }
242
243 size_t fuse_dirent_size(size_t namelen)
244 {
245 return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen);
246 }
247
248 char *fuse_add_dirent(char *buf, const char *name, const struct stat *stbuf,
249 off_t off)
250 {
251 unsigned namelen = strlen(name);
252 unsigned entlen = FUSE_NAME_OFFSET + namelen;
253 unsigned entsize = fuse_dirent_size(namelen);
254 unsigned padlen = entsize - entlen;
255 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
256
257 dirent->ino = stbuf->st_ino;
258 dirent->off = off;
259 dirent->namelen = namelen;
260 dirent->type = (stbuf->st_mode & 0170000) >> 12;
261 strncpy(dirent->name, name, namelen);
262 if (padlen)
263 memset(buf + entlen, 0, padlen);
264
265 return buf + entsize;
266 }
267
268 size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
269 const char *name, const struct stat *stbuf, off_t off)
270 {
271 size_t entsize;
272
273 (void) req;
274 entsize = fuse_dirent_size(strlen(name));
275 if (entsize <= bufsize && buf)
276 fuse_add_dirent(buf, name, stbuf, off);
277 return entsize;
278 }
279
280 static void convert_statfs(const struct statvfs *stbuf,
281 struct fuse_kstatfs *kstatfs)
282 {
283 kstatfs->bsize = stbuf->f_bsize;
284 kstatfs->frsize = stbuf->f_frsize;
285 kstatfs->blocks = stbuf->f_blocks;
286 kstatfs->bfree = stbuf->f_bfree;
287 kstatfs->bavail = stbuf->f_bavail;
288 kstatfs->files = stbuf->f_files;
289 kstatfs->ffree = stbuf->f_ffree;
290 kstatfs->namelen = stbuf->f_namemax;
291 }
292
293 static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize)
294 {
295 return send_reply(req, 0, arg, argsize);
296 }
297
298 int fuse_reply_err(fuse_req_t req, int err)
299 {
300 return send_reply(req, -err, NULL, 0);
301 }
302
303 void fuse_reply_none(fuse_req_t req)
304 {
305 if (req->ch)
306 fuse_chan_send(req->ch, NULL, 0);
307 fuse_free_req(req);
308 }
309
310 static unsigned long calc_timeout_sec(double t)
311 {
312 if (t > (double) ULONG_MAX)
313 return ULONG_MAX;
314 else if (t < 0.0)
315 return 0;
316 else
317 return (unsigned long) t;
318 }
319
320 static unsigned int calc_timeout_nsec(double t)
321 {
322 double f = t - (double) calc_timeout_sec(t);
323 if (f < 0.0)
324 return 0;
325 else if (f >= 0.999999999)
326 return 999999999;
327 else
328 return (unsigned int) (f * 1.0e9);
329 }
330
331 static void fill_entry(struct fuse_entry_out *arg,
332 const struct fuse_entry_param *e)
333 {
334 arg->nodeid = e->ino;
335 arg->generation = e->generation;
336 arg->entry_valid = calc_timeout_sec(e->entry_timeout);
337 arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout);
338 arg->attr_valid = calc_timeout_sec(e->attr_timeout);
339 arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout);
340 convert_stat(&e->attr, &arg->attr);
341 }
342
343 static void fill_open(struct fuse_open_out *arg,
344 const struct fuse_file_info *f)
345 {
346 arg->fh = f->fh;
347 if (f->direct_io)
348 arg->open_flags |= FOPEN_DIRECT_IO;
349 if (f->keep_cache)
350 arg->open_flags |= FOPEN_KEEP_CACHE;
351 if (f->nonseekable)
352 arg->open_flags |= FOPEN_NONSEEKABLE;
353 }
354
355 int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
356 {
357 struct fuse_entry_out arg;
358 size_t size = req->f->conn.proto_minor < 9 ?
359 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);
360
361 /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
362 negative entry */
363 if (!e->ino && req->f->conn.proto_minor < 4)
364 return fuse_reply_err(req, ENOENT);
365
366 memset(&arg, 0, sizeof(arg));
367 fill_entry(&arg, e);
368 return send_reply_ok(req, &arg, size);
369 }
370
371 int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
372 const struct fuse_file_info *f)
373 {
374 char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)];
375 size_t entrysize = req->f->conn.proto_minor < 9 ?
376 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
377 struct fuse_entry_out *earg = (struct fuse_entry_out *) buf;
378 struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize);
379
380 memset(buf, 0, sizeof(buf));
381 fill_entry(earg, e);
382 fill_open(oarg, f);
383 return send_reply_ok(req, buf,
384 entrysize + sizeof(struct fuse_open_out));
385 }
386
387 int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
388 double attr_timeout)
389 {
390 struct fuse_attr_out arg;
391 size_t size = req->f->conn.proto_minor < 9 ?
392 FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);
393
394 memset(&arg, 0, sizeof(arg));
395 arg.attr_valid = calc_timeout_sec(attr_timeout);
396 arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout);
397 convert_stat(attr, &arg.attr);
398
399 return send_reply_ok(req, &arg, size);
400 }
401
402 int fuse_reply_readlink(fuse_req_t req, const char *linkname)
403 {
404 return send_reply_ok(req, linkname, strlen(linkname));
405 }
406
407 int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f)
408 {
409 struct fuse_open_out arg;
410
411 memset(&arg, 0, sizeof(arg));
412 fill_open(&arg, f);
413 return send_reply_ok(req, &arg, sizeof(arg));
414 }
415
416 int fuse_reply_write(fuse_req_t req, size_t count)
417 {
418 struct fuse_write_out arg;
419
420 memset(&arg, 0, sizeof(arg));
421 arg.size = count;
422
423 return send_reply_ok(req, &arg, sizeof(arg));
424 }
425
426 int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
427 {
428 return send_reply_ok(req, buf, size);
429 }
430
431 static int fuse_send_data_iov_fallback(struct fuse_ll *f, struct fuse_chan *ch,
432 struct iovec *iov, int iov_count,
433 struct fuse_bufvec *buf,
434 size_t len)
435 {
436 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
437 void *mbuf;
438 int res;
439
440 /* FIXME: Avoid memory copy if none of the buffers contain an fd */
441 res = posix_memalign(&mbuf, pagesize, len);
442 if (res != 0)
443 return res;
444
445 mem_buf.buf[0].mem = mbuf;
446 res = fuse_buf_copy(&mem_buf, buf, 0);
447 if (res < 0) {
448 free(mbuf);
449 return -res;
450 }
451 len = res;
452
453 iov[iov_count].iov_base = mbuf;
454 iov[iov_count].iov_len = len;
455 iov_count++;
456 res = fuse_send_msg(f, ch, iov, iov_count);
457 free(mbuf);
458
459 return res;
460 }
461
462 struct fuse_ll_pipe {
463 size_t size;
464 int can_grow;
465 int pipe[2];
466 };
467
468 static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp)
469 {
470 close(llp->pipe[0]);
471 close(llp->pipe[1]);
472 free(llp);
473 }
474
475 #ifdef HAVE_SPLICE
476 static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_ll *f)
477 {
478 struct fuse_ll_pipe *llp = pthread_getspecific(f->pipe_key);
479 if (llp == NULL) {
480 int res;
481
482 llp = malloc(sizeof(struct fuse_ll_pipe));
483 if (llp == NULL)
484 return NULL;
485
486 res = pipe(llp->pipe);
487 if (res == -1) {
488 free(llp);
489 return NULL;
490 }
491
492 if (fcntl(llp->pipe[0], F_SETFL, O_NONBLOCK) == -1 ||
493 fcntl(llp->pipe[1], F_SETFL, O_NONBLOCK) == -1) {
494 close(llp->pipe[0]);
495 close(llp->pipe[1]);
496 free(llp);
497 return NULL;
498 }
499
500 /*
501 *the default size is 16 pages on linux
502 */
503 llp->size = pagesize * 16;
504 llp->can_grow = 1;
505
506 pthread_setspecific(f->pipe_key, llp);
507 }
508
509 return llp;
510 }
511 #endif
512
513 static void fuse_ll_clear_pipe(struct fuse_ll *f)
514 {
515 struct fuse_ll_pipe *llp = pthread_getspecific(f->pipe_key);
516 if (llp) {
517 pthread_setspecific(f->pipe_key, NULL);
518 fuse_ll_pipe_free(llp);
519 }
520 }
521
522 #if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE)
523 static int read_back(int fd, char *buf, size_t len)
524 {
525 int res;
526
527 res = read(fd, buf, len);
528 if (res == -1) {
529 fprintf(stderr, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno));
530 return -EIO;
531 }
532 if (res != len) {
533 fprintf(stderr, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len);
534 return -EIO;
535 }
536 return 0;
537 }
538
539 static int fuse_send_data_iov(struct fuse_ll *f, struct fuse_chan *ch,
540 struct iovec *iov, int iov_count,
541 struct fuse_bufvec *buf, unsigned int flags)
542 {
543 int res;
544 size_t len = fuse_buf_size(buf);
545 struct fuse_out_header *out = iov[0].iov_base;
546 struct fuse_ll_pipe *llp;
547 int splice_flags;
548 size_t pipesize;
549 size_t total_fd_size;
550 size_t idx;
551 size_t headerlen;
552 struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len);
553
554 if (f->broken_splice_nonblock)
555 goto fallback;
556
557 if (flags & FUSE_BUF_NO_SPLICE)
558 goto fallback;
559
560 total_fd_size = 0;
561 for (idx = buf->idx; idx < buf->count; idx++) {
562 if (buf->buf[idx].flags & FUSE_BUF_IS_FD) {
563 total_fd_size = buf->buf[idx].size;
564 if (idx == buf->idx)
565 total_fd_size -= buf->off;
566 }
567 }
568 if (total_fd_size < 2 * pagesize)
569 goto fallback;
570
571 if (f->conn.proto_minor < 14 ||
572 !(f->conn.want & FUSE_CAP_SPLICE_WRITE))
573 goto fallback;
574
575 llp = fuse_ll_get_pipe(f);
576 if (llp == NULL)
577 goto fallback;
578
579
580 headerlen = iov_length(iov, iov_count);
581
582 out->len = headerlen + len;
583
584 /*
585 * Heuristic for the required pipe size, does not work if the
586 * source contains less than page size fragments
587 */
588 pipesize = pagesize * (iov_count + buf->count + 1) + out->len;
589
590 if (llp->size < pipesize) {
591 if (llp->can_grow) {
592 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize);
593 if (res == -1) {
594 llp->can_grow = 0;
595 goto fallback;
596 }
597 llp->size = res;
598 }
599 if (llp->size < pipesize)
600 goto fallback;
601 }
602
603
604 res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK);
605 if (res == -1)
606 goto fallback;
607
608 if (res != headerlen) {
609 res = -EIO;
610 fprintf(stderr, "fuse: short vmsplice to pipe: %u/%zu\n", res,
611 headerlen);
612 goto clear_pipe;
613 }
614
615 pipe_buf.buf[0].flags = FUSE_BUF_IS_FD;
616 pipe_buf.buf[0].fd = llp->pipe[1];
617
618 res = fuse_buf_copy(&pipe_buf, buf,
619 FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK);
620 if (res < 0) {
621 if (res == -EAGAIN || res == -EINVAL) {
622 /*
623 * Should only get EAGAIN on kernels with
624 * broken SPLICE_F_NONBLOCK support (<=
625 * 2.6.35) where this error or a short read is
626 * returned even if the pipe itself is not
627 * full
628 *
629 * EINVAL might mean that splice can't handle
630 * this combination of input and output.
631 */
632 if (res == -EAGAIN)
633 f->broken_splice_nonblock = 1;
634
635 pthread_setspecific(f->pipe_key, NULL);
636 fuse_ll_pipe_free(llp);
637 goto fallback;
638 }
639 res = -res;
640 goto clear_pipe;
641 }
642
643 if (res != 0 && res < len) {
644 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
645 void *mbuf;
646 size_t now_len = res;
647 /*
648 * For regular files a short count is either
649 * 1) due to EOF, or
650 * 2) because of broken SPLICE_F_NONBLOCK (see above)
651 *
652 * For other inputs it's possible that we overflowed
653 * the pipe because of small buffer fragments.
654 */
655
656 res = posix_memalign(&mbuf, pagesize, len);
657 if (res != 0)
658 goto clear_pipe;
659
660 mem_buf.buf[0].mem = mbuf;
661 mem_buf.off = now_len;
662 res = fuse_buf_copy(&mem_buf, buf, 0);
663 if (res > 0) {
664 char *tmpbuf;
665 size_t extra_len = res;
666 /*
667 * Trickiest case: got more data. Need to get
668 * back the data from the pipe and then fall
669 * back to regular write.
670 */
671 tmpbuf = malloc(headerlen);
672 if (tmpbuf == NULL) {
673 free(mbuf);
674 res = ENOMEM;
675 goto clear_pipe;
676 }
677 res = read_back(llp->pipe[0], tmpbuf, headerlen);
678 if (res != 0) {
679 free(mbuf);
680 goto clear_pipe;
681 }
682 free(tmpbuf);
683 res = read_back(llp->pipe[0], mbuf, now_len);
684 if (res != 0) {
685 free(mbuf);
686 goto clear_pipe;
687 }
688 len = now_len + extra_len;
689 iov[iov_count].iov_base = mbuf;
690 iov[iov_count].iov_len = len;
691 iov_count++;
692 res = fuse_send_msg(f, ch, iov, iov_count);
693 free(mbuf);
694 return res;
695 }
696 free(mbuf);
697 res = now_len;
698 }
699 len = res;
700 out->len = headerlen + len;
701
702 if (f->debug) {
703 fprintf(stderr,
704 " unique: %llu, success, outsize: %i (splice)\n",
705 (unsigned long long) out->unique, out->len);
706 }
707
708 splice_flags = 0;
709 if ((flags & FUSE_BUF_SPLICE_MOVE) &&
710 (f->conn.want & FUSE_CAP_SPLICE_MOVE))
711 splice_flags |= SPLICE_F_MOVE;
712
713 res = splice(llp->pipe[0], NULL,
714 fuse_chan_fd(ch), NULL, out->len, splice_flags);
715 if (res == -1) {
716 res = -errno;
717 perror("fuse: splice from pipe");
718 goto clear_pipe;
719 }
720 if (res != out->len) {
721 res = -EIO;
722 fprintf(stderr, "fuse: short splice from pipe: %u/%u\n",
723 res, out->len);
724 goto clear_pipe;
725 }
726 return 0;
727
728 clear_pipe:
729 fuse_ll_clear_pipe(f);
730 return res;
731
732 fallback:
733 return fuse_send_data_iov_fallback(f, ch, iov, iov_count, buf, len);
734 }
735 #else
736 static int fuse_send_data_iov(struct fuse_ll *f, struct fuse_chan *ch,
737 struct iovec *iov, int iov_count,
738 struct fuse_bufvec *buf, unsigned int flags)
739 {
740 size_t len = fuse_buf_size(buf);
741 (void) flags;
742
743 return fuse_send_data_iov_fallback(f, ch, iov, iov_count, buf, len);
744 }
745 #endif
746
747 int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv,
748 enum fuse_buf_copy_flags flags)
749 {
750 struct iovec iov[2];
751 struct fuse_out_header out;
752 int res;
753
754 iov[0].iov_base = &out;
755 iov[0].iov_len = sizeof(struct fuse_out_header);
756
757 out.unique = req->unique;
758 out.error = 0;
759
760 res = fuse_send_data_iov(req->f, req->ch, iov, 1, bufv, flags);
761 if (res <= 0)
762 return res;
763 else
764 return fuse_reply_err(req, res);
765 }
766
767 int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
768 {
769 struct fuse_statfs_out arg;
770 size_t size = req->f->conn.proto_minor < 4 ?
771 FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
772
773 memset(&arg, 0, sizeof(arg));
774 convert_statfs(stbuf, &arg.st);
775
776 return send_reply_ok(req, &arg, size);
777 }
778
779 int fuse_reply_xattr(fuse_req_t req, size_t count)
780 {
781 struct fuse_getxattr_out arg;
782
783 memset(&arg, 0, sizeof(arg));
784 arg.size = count;
785
786 return send_reply_ok(req, &arg, sizeof(arg));
787 }
788
789 int fuse_reply_lock(fuse_req_t req, struct flock *lock)
790 {
791 struct fuse_lk_out arg;
792
793 memset(&arg, 0, sizeof(arg));
794 arg.lk.type = lock->l_type;
795 if (lock->l_type != F_UNLCK) {
796 arg.lk.start = lock->l_start;
797 if (lock->l_len == 0)
798 arg.lk.end = OFFSET_MAX;
799 else
800 arg.lk.end = lock->l_start + lock->l_len - 1;
801 }
802 arg.lk.pid = lock->l_pid;
803 return send_reply_ok(req, &arg, sizeof(arg));
804 }
805
806 int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
807 {
808 struct fuse_bmap_out arg;
809
810 memset(&arg, 0, sizeof(arg));
811 arg.block = idx;
812
813 return send_reply_ok(req, &arg, sizeof(arg));
814 }
815
816 static struct fuse_ioctl_iovec *fuse_ioctl_iovec_copy(const struct iovec *iov,
817 size_t count)
818 {
819 struct fuse_ioctl_iovec *fiov;
820 size_t i;
821
822 fiov = malloc(sizeof(fiov[0]) * count);
823 if (!fiov)
824 return NULL;
825
826 for (i = 0; i < count; i++) {
827 fiov[i].base = (uintptr_t) iov[i].iov_base;
828 fiov[i].len = iov[i].iov_len;
829 }
830
831 return fiov;
832 }
833
834 int fuse_reply_ioctl_retry(fuse_req_t req,
835 const struct iovec *in_iov, size_t in_count,
836 const struct iovec *out_iov, size_t out_count)
837 {
838 struct fuse_ioctl_out arg;
839 struct fuse_ioctl_iovec *in_fiov = NULL;
840 struct fuse_ioctl_iovec *out_fiov = NULL;
841 struct iovec iov[4];
842 size_t count = 1;
843 int res;
844
845 memset(&arg, 0, sizeof(arg));
846 arg.flags |= FUSE_IOCTL_RETRY;
847 arg.in_iovs = in_count;
848 arg.out_iovs = out_count;
849 iov[count].iov_base = &arg;
850 iov[count].iov_len = sizeof(arg);
851 count++;
852
853 if (req->f->conn.proto_minor < 16) {
854 if (in_count) {
855 iov[count].iov_base = (void *)in_iov;
856 iov[count].iov_len = sizeof(in_iov[0]) * in_count;
857 count++;
858 }
859
860 if (out_count) {
861 iov[count].iov_base = (void *)out_iov;
862 iov[count].iov_len = sizeof(out_iov[0]) * out_count;
863 count++;
864 }
865 } else {
866 /* Can't handle non-compat 64bit ioctls on 32bit */
867 if (sizeof(void *) == 4 && req->ioctl_64bit) {
868 res = fuse_reply_err(req, EINVAL);
869 goto out;
870 }
871
872 if (in_count) {
873 in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
874 if (!in_fiov)
875 goto enomem;
876
877 iov[count].iov_base = (void *)in_fiov;
878 iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
879 count++;
880 }
881 if (out_count) {
882 out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
883 if (!out_fiov)
884 goto enomem;
885
886 iov[count].iov_base = (void *)out_fiov;
887 iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
888 count++;
889 }
890 }
891
892 res = send_reply_iov(req, 0, iov, count);
893 out:
894 free(in_fiov);
895 free(out_fiov);
896
897 return res;
898
899 enomem:
900 res = fuse_reply_err(req, ENOMEM);
901 goto out;
902 }
903
904 int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
905 {
906 struct fuse_ioctl_out arg;
907 struct iovec iov[3];
908 size_t count = 1;
909
910 memset(&arg, 0, sizeof(arg));
911 arg.result = result;
912 iov[count].iov_base = &arg;
913 iov[count].iov_len = sizeof(arg);
914 count++;
915
916 if (size) {
917 iov[count].iov_base = (char *) buf;
918 iov[count].iov_len = size;
919 count++;
920 }
921
922 return send_reply_iov(req, 0, iov, count);
923 }
924
925 int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
926 int count)
927 {
928 struct iovec *padded_iov;
929 struct fuse_ioctl_out arg;
930 int res;
931
932 padded_iov = malloc((count + 2) * sizeof(struct iovec));
933 if (padded_iov == NULL)
934 return fuse_reply_err(req, ENOMEM);
935
936 memset(&arg, 0, sizeof(arg));
937 arg.result = result;
938 padded_iov[1].iov_base = &arg;
939 padded_iov[1].iov_len = sizeof(arg);
940
941 memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
942
943 res = send_reply_iov(req, 0, padded_iov, count + 2);
944 free(padded_iov);
945
946 return res;
947 }
948
949 int fuse_reply_poll(fuse_req_t req, unsigned revents)
950 {
951 struct fuse_poll_out arg;
952
953 memset(&arg, 0, sizeof(arg));
954 arg.revents = revents;
955
956 return send_reply_ok(req, &arg, sizeof(arg));
957 }
958
959 static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
960 {
961 char *name = (char *) inarg;
962
963 if (req->f->op.lookup)
964 req->f->op.lookup(req, nodeid, name);
965 else
966 fuse_reply_err(req, ENOSYS);
967 }
968
969 static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
970 {
971 struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;
972
973 if (req->f->op.forget)
974 req->f->op.forget(req, nodeid, arg->nlookup);
975 else
976 fuse_reply_none(req);
977 }
978
979 static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid,
980 const void *inarg)
981 {
982 struct fuse_batch_forget_in *arg = (void *) inarg;
983 struct fuse_forget_one *param = (void *) PARAM(arg);
984 unsigned int i;
985
986 (void) nodeid;
987
988 if (req->f->op.forget_multi) {
989 req->f->op.forget_multi(req, arg->count,
990 (struct fuse_forget_data *) param);
991 } else if (req->f->op.forget) {
992 for (i = 0; i < arg->count; i++) {
993 struct fuse_forget_one *forget = &param[i];
994 struct fuse_req *dummy_req;
995
996 dummy_req = fuse_ll_alloc_req(req->f);
997 if (dummy_req == NULL)
998 break;
999
1000 dummy_req->unique = req->unique;
1001 dummy_req->ctx = req->ctx;
1002 dummy_req->ch = NULL;
1003
1004 req->f->op.forget(dummy_req, forget->nodeid,
1005 forget->nlookup);
1006 }
1007 fuse_reply_none(req);
1008 } else {
1009 fuse_reply_none(req);
1010 }
1011 }
1012
1013 static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1014 {
1015 struct fuse_file_info *fip = NULL;
1016 struct fuse_file_info fi;
1017
1018 if (req->f->conn.proto_minor >= 9) {
1019 struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;
1020
1021 if (arg->getattr_flags & FUSE_GETATTR_FH) {
1022 memset(&fi, 0, sizeof(fi));
1023 fi.fh = arg->fh;
1024 fi.fh_old = fi.fh;
1025 fip = &fi;
1026 }
1027 }
1028
1029 if (req->f->op.getattr)
1030 req->f->op.getattr(req, nodeid, fip);
1031 else
1032 fuse_reply_err(req, ENOSYS);
1033 }
1034
1035 static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1036 {
1037 struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;
1038
1039 if (req->f->op.setattr) {
1040 struct fuse_file_info *fi = NULL;
1041 struct fuse_file_info fi_store;
1042 struct stat stbuf;
1043 memset(&stbuf, 0, sizeof(stbuf));
1044 convert_attr(arg, &stbuf);
1045 if (arg->valid & FATTR_FH) {
1046 arg->valid &= ~FATTR_FH;
1047 memset(&fi_store, 0, sizeof(fi_store));
1048 fi = &fi_store;
1049 fi->fh = arg->fh;
1050 fi->fh_old = fi->fh;
1051 }
1052 arg->valid &=
1053 FUSE_SET_ATTR_MODE |
1054 FUSE_SET_ATTR_UID |
1055 FUSE_SET_ATTR_GID |
1056 FUSE_SET_ATTR_SIZE |
1057 FUSE_SET_ATTR_ATIME |
1058 FUSE_SET_ATTR_MTIME |
1059 FUSE_SET_ATTR_ATIME_NOW |
1060 FUSE_SET_ATTR_MTIME_NOW;
1061
1062 req->f->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
1063 } else
1064 fuse_reply_err(req, ENOSYS);
1065 }
1066
1067 static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1068 {
1069 struct fuse_access_in *arg = (struct fuse_access_in *) inarg;
1070
1071 if (req->f->op.access)
1072 req->f->op.access(req, nodeid, arg->mask);
1073 else
1074 fuse_reply_err(req, ENOSYS);
1075 }
1076
1077 static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1078 {
1079 (void) inarg;
1080
1081 if (req->f->op.readlink)
1082 req->f->op.readlink(req, nodeid);
1083 else
1084 fuse_reply_err(req, ENOSYS);
1085 }
1086
1087 static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1088 {
1089 struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
1090 char *name = PARAM(arg);
1091
1092 if (req->f->conn.proto_minor >= 12)
1093 req->ctx.umask = arg->umask;
1094 else
1095 name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
1096
1097 if (req->f->op.mknod)
1098 req->f->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
1099 else
1100 fuse_reply_err(req, ENOSYS);
1101 }
1102
1103 static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1104 {
1105 struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;
1106
1107 if (req->f->conn.proto_minor >= 12)
1108 req->ctx.umask = arg->umask;
1109
1110 if (req->f->op.mkdir)
1111 req->f->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
1112 else
1113 fuse_reply_err(req, ENOSYS);
1114 }
1115
1116 static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1117 {
1118 char *name = (char *) inarg;
1119
1120 if (req->f->op.unlink)
1121 req->f->op.unlink(req, nodeid, name);
1122 else
1123 fuse_reply_err(req, ENOSYS);
1124 }
1125
1126 static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1127 {
1128 char *name = (char *) inarg;
1129
1130 if (req->f->op.rmdir)
1131 req->f->op.rmdir(req, nodeid, name);
1132 else
1133 fuse_reply_err(req, ENOSYS);
1134 }
1135
1136 static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1137 {
1138 char *name = (char *) inarg;
1139 char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;
1140
1141 if (req->f->op.symlink)
1142 req->f->op.symlink(req, linkname, nodeid, name);
1143 else
1144 fuse_reply_err(req, ENOSYS);
1145 }
1146
1147 static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1148 {
1149 struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
1150 char *oldname = PARAM(arg);
1151 char *newname = oldname + strlen(oldname) + 1;
1152
1153 if (req->f->op.rename)
1154 req->f->op.rename(req, nodeid, oldname, arg->newdir, newname);
1155 else
1156 fuse_reply_err(req, ENOSYS);
1157 }
1158
1159 static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1160 {
1161 struct fuse_link_in *arg = (struct fuse_link_in *) inarg;
1162
1163 if (req->f->op.link)
1164 req->f->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
1165 else
1166 fuse_reply_err(req, ENOSYS);
1167 }
1168
1169 static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1170 {
1171 struct fuse_create_in *arg = (struct fuse_create_in *) inarg;
1172
1173 if (req->f->op.create) {
1174 struct fuse_file_info fi;
1175 char *name = PARAM(arg);
1176
1177 memset(&fi, 0, sizeof(fi));
1178 fi.flags = arg->flags;
1179
1180 if (req->f->conn.proto_minor >= 12)
1181 req->ctx.umask = arg->umask;
1182 else
1183 name = (char *) inarg + sizeof(struct fuse_open_in);
1184
1185 req->f->op.create(req, nodeid, name, arg->mode, &fi);
1186 } else
1187 fuse_reply_err(req, ENOSYS);
1188 }
1189
1190 static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1191 {
1192 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1193 struct fuse_file_info fi;
1194
1195 memset(&fi, 0, sizeof(fi));
1196 fi.flags = arg->flags;
1197
1198 if (req->f->op.open)
1199 req->f->op.open(req, nodeid, &fi);
1200 else
1201 fuse_reply_open(req, &fi);
1202 }
1203
1204 static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1205 {
1206 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1207
1208 if (req->f->op.read) {
1209 struct fuse_file_info fi;
1210
1211 memset(&fi, 0, sizeof(fi));
1212 fi.fh = arg->fh;
1213 fi.fh_old = fi.fh;
1214 if (req->f->conn.proto_minor >= 9) {
1215 fi.lock_owner = arg->lock_owner;
1216 fi.flags = arg->flags;
1217 }
1218 req->f->op.read(req, nodeid, arg->size, arg->offset, &fi);
1219 } else
1220 fuse_reply_err(req, ENOSYS);
1221 }
1222
1223 static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1224 {
1225 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1226 struct fuse_file_info fi;
1227 char *param;
1228
1229 memset(&fi, 0, sizeof(fi));
1230 fi.fh = arg->fh;
1231 fi.fh_old = fi.fh;
1232 fi.writepage = arg->write_flags & 1;
1233
1234 if (req->f->conn.proto_minor < 9) {
1235 param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1236 } else {
1237 fi.lock_owner = arg->lock_owner;
1238 fi.flags = arg->flags;
1239 param = PARAM(arg);
1240 }
1241
1242 if (req->f->op.write)
1243 req->f->op.write(req, nodeid, param, arg->size,
1244 arg->offset, &fi);
1245 else
1246 fuse_reply_err(req, ENOSYS);
1247 }
1248
1249 static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
1250 const struct fuse_buf *ibuf)
1251 {
1252 struct fuse_ll *f = req->f;
1253 struct fuse_bufvec bufv = {
1254 .buf[0] = *ibuf,
1255 .count = 1,
1256 };
1257 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1258 struct fuse_file_info fi;
1259
1260 memset(&fi, 0, sizeof(fi));
1261 fi.fh = arg->fh;
1262 fi.fh_old = fi.fh;
1263 fi.writepage = arg->write_flags & 1;
1264
1265 if (req->f->conn.proto_minor < 9) {
1266 bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1267 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1268 FUSE_COMPAT_WRITE_IN_SIZE;
1269 assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD));
1270 } else {
1271 fi.lock_owner = arg->lock_owner;
1272 fi.flags = arg->flags;
1273 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
1274 bufv.buf[0].mem = PARAM(arg);
1275
1276 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1277 sizeof(struct fuse_write_in);
1278 }
1279 if (bufv.buf[0].size < arg->size) {
1280 fprintf(stderr, "fuse: do_write_buf: buffer size too small\n");
1281 fuse_reply_err(req, EIO);
1282 goto out;
1283 }
1284 bufv.buf[0].size = arg->size;
1285
1286 req->f->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
1287
1288 out:
1289 /* Need to reset the pipe if ->write_buf() didn't consume all data */
1290 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
1291 fuse_ll_clear_pipe(f);
1292 }
1293
1294 static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1295 {
1296 struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
1297 struct fuse_file_info fi;
1298
1299 memset(&fi, 0, sizeof(fi));
1300 fi.fh = arg->fh;
1301 fi.fh_old = fi.fh;
1302 fi.flush = 1;
1303 if (req->f->conn.proto_minor >= 7)
1304 fi.lock_owner = arg->lock_owner;
1305
1306 if (req->f->op.flush)
1307 req->f->op.flush(req, nodeid, &fi);
1308 else
1309 fuse_reply_err(req, ENOSYS);
1310 }
1311
1312 static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1313 {
1314 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1315 struct fuse_file_info fi;
1316
1317 memset(&fi, 0, sizeof(fi));
1318 fi.flags = arg->flags;
1319 fi.fh = arg->fh;
1320 fi.fh_old = fi.fh;
1321 if (req->f->conn.proto_minor >= 8) {
1322 fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
1323 fi.lock_owner = arg->lock_owner;
1324 }
1325 if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) {
1326 fi.flock_release = 1;
1327 fi.lock_owner = arg->lock_owner;
1328 }
1329
1330 if (req->f->op.release)
1331 req->f->op.release(req, nodeid, &fi);
1332 else
1333 fuse_reply_err(req, 0);
1334 }
1335
1336 static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1337 {
1338 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1339 struct fuse_file_info fi;
1340
1341 memset(&fi, 0, sizeof(fi));
1342 fi.fh = arg->fh;
1343 fi.fh_old = fi.fh;
1344
1345 if (req->f->op.fsync)
1346 req->f->op.fsync(req, nodeid, arg->fsync_flags & 1, &fi);
1347 else
1348 fuse_reply_err(req, ENOSYS);
1349 }
1350
1351 static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1352 {
1353 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1354 struct fuse_file_info fi;
1355
1356 memset(&fi, 0, sizeof(fi));
1357 fi.flags = arg->flags;
1358
1359 if (req->f->op.opendir)
1360 req->f->op.opendir(req, nodeid, &fi);
1361 else
1362 fuse_reply_open(req, &fi);
1363 }
1364
1365 static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1366 {
1367 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1368 struct fuse_file_info fi;
1369
1370 memset(&fi, 0, sizeof(fi));
1371 fi.fh = arg->fh;
1372 fi.fh_old = fi.fh;
1373
1374 if (req->f->op.readdir)
1375 req->f->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
1376 else
1377 fuse_reply_err(req, ENOSYS);
1378 }
1379
1380 static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1381 {
1382 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1383 struct fuse_file_info fi;
1384
1385 memset(&fi, 0, sizeof(fi));
1386 fi.flags = arg->flags;
1387 fi.fh = arg->fh;
1388 fi.fh_old = fi.fh;
1389
1390 if (req->f->op.releasedir)
1391 req->f->op.releasedir(req, nodeid, &fi);
1392 else
1393 fuse_reply_err(req, 0);
1394 }
1395
1396 static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1397 {
1398 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1399 struct fuse_file_info fi;
1400
1401 memset(&fi, 0, sizeof(fi));
1402 fi.fh = arg->fh;
1403 fi.fh_old = fi.fh;
1404
1405 if (req->f->op.fsyncdir)
1406 req->f->op.fsyncdir(req, nodeid, arg->fsync_flags & 1, &fi);
1407 else
1408 fuse_reply_err(req, ENOSYS);
1409 }
1410
1411 static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1412 {
1413 (void) nodeid;
1414 (void) inarg;
1415
1416 if (req->f->op.statfs)
1417 req->f->op.statfs(req, nodeid);
1418 else {
1419 struct statvfs buf = {
1420 .f_namemax = 255,
1421 .f_bsize = 512,
1422 };
1423 fuse_reply_statfs(req, &buf);
1424 }
1425 }
1426
1427 static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1428 {
1429 struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
1430 char *name = PARAM(arg);
1431 char *value = name + strlen(name) + 1;
1432
1433 if (req->f->op.setxattr)
1434 req->f->op.setxattr(req, nodeid, name, value, arg->size,
1435 arg->flags);
1436 else
1437 fuse_reply_err(req, ENOSYS);
1438 }
1439
1440 static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1441 {
1442 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1443
1444 if (req->f->op.getxattr)
1445 req->f->op.getxattr(req, nodeid, PARAM(arg), arg->size);
1446 else
1447 fuse_reply_err(req, ENOSYS);
1448 }
1449
1450 static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1451 {
1452 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1453
1454 if (req->f->op.listxattr)
1455 req->f->op.listxattr(req, nodeid, arg->size);
1456 else
1457 fuse_reply_err(req, ENOSYS);
1458 }
1459
1460 static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1461 {
1462 char *name = (char *) inarg;
1463
1464 if (req->f->op.removexattr)
1465 req->f->op.removexattr(req, nodeid, name);
1466 else
1467 fuse_reply_err(req, ENOSYS);
1468 }
1469
1470 static void convert_fuse_file_lock(struct fuse_file_lock *fl,
1471 struct flock *flock)
1472 {
1473 memset(flock, 0, sizeof(struct flock));
1474 flock->l_type = fl->type;
1475 flock->l_whence = SEEK_SET;
1476 flock->l_start = fl->start;
1477 if (fl->end == OFFSET_MAX)
1478 flock->l_len = 0;
1479 else
1480 flock->l_len = fl->end - fl->start + 1;
1481 flock->l_pid = fl->pid;
1482 }
1483
1484 static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1485 {
1486 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1487 struct fuse_file_info fi;
1488 struct flock flock;
1489
1490 memset(&fi, 0, sizeof(fi));
1491 fi.fh = arg->fh;
1492 fi.lock_owner = arg->owner;
1493
1494 convert_fuse_file_lock(&arg->lk, &flock);
1495 if (req->f->op.getlk)
1496 req->f->op.getlk(req, nodeid, &fi, &flock);
1497 else
1498 fuse_reply_err(req, ENOSYS);
1499 }
1500
1501 static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
1502 const void *inarg, int sleep)
1503 {
1504 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1505 struct fuse_file_info fi;
1506 struct flock flock;
1507
1508 memset(&fi, 0, sizeof(fi));
1509 fi.fh = arg->fh;
1510 fi.lock_owner = arg->owner;
1511
1512 if (arg->lk_flags & FUSE_LK_FLOCK) {
1513 int op = 0;
1514
1515 switch (arg->lk.type) {
1516 case F_RDLCK:
1517 op = LOCK_SH;
1518 break;
1519 case F_WRLCK:
1520 op = LOCK_EX;
1521 break;
1522 case F_UNLCK:
1523 op = LOCK_UN;
1524 break;
1525 }
1526 if (!sleep)
1527 op |= LOCK_NB;
1528
1529 if (req->f->op.flock)
1530 req->f->op.flock(req, nodeid, &fi, op);
1531 else
1532 fuse_reply_err(req, ENOSYS);
1533 } else {
1534 convert_fuse_file_lock(&arg->lk, &flock);
1535 if (req->f->op.setlk)
1536 req->f->op.setlk(req, nodeid, &fi, &flock, sleep);
1537 else
1538 fuse_reply_err(req, ENOSYS);
1539 }
1540 }
1541
1542 static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1543 {
1544 do_setlk_common(req, nodeid, inarg, 0);
1545 }
1546
1547 static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1548 {
1549 do_setlk_common(req, nodeid, inarg, 1);
1550 }
1551
1552 static int find_interrupted(struct fuse_ll *f, struct fuse_req *req)
1553 {
1554 struct fuse_req *curr;
1555
1556 for (curr = f->list.next; curr != &f->list; curr = curr->next) {
1557 if (curr->unique == req->u.i.unique) {
1558 fuse_interrupt_func_t func;
1559 void *data;
1560
1561 curr->ctr++;
1562 pthread_mutex_unlock(&f->lock);
1563
1564 /* Ugh, ugly locking */
1565 pthread_mutex_lock(&curr->lock);
1566 pthread_mutex_lock(&f->lock);
1567 curr->interrupted = 1;
1568 func = curr->u.ni.func;
1569 data = curr->u.ni.data;
1570 pthread_mutex_unlock(&f->lock);
1571 if (func)
1572 func(curr, data);
1573 pthread_mutex_unlock(&curr->lock);
1574
1575 pthread_mutex_lock(&f->lock);
1576 curr->ctr--;
1577 if (!curr->ctr)
1578 destroy_req(curr);
1579
1580 return 1;
1581 }
1582 }
1583 for (curr = f->interrupts.next; curr != &f->interrupts;
1584 curr = curr->next) {
1585 if (curr->u.i.unique == req->u.i.unique)
1586 return 1;
1587 }
1588 return 0;
1589 }
1590
1591 static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1592 {
1593 struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
1594 struct fuse_ll *f = req->f;
1595
1596 (void) nodeid;
1597 if (f->debug)
1598 fprintf(stderr, "INTERRUPT: %llu\n",
1599 (unsigned long long) arg->unique);
1600
1601 req->u.i.unique = arg->unique;
1602
1603 pthread_mutex_lock(&f->lock);
1604 if (find_interrupted(f, req))
1605 destroy_req(req);
1606 else
1607 list_add_req(req, &f->interrupts);
1608 pthread_mutex_unlock(&f->lock);
1609 }
1610
1611 static struct fuse_req *check_interrupt(struct fuse_ll *f, struct fuse_req *req)
1612 {
1613 struct fuse_req *curr;
1614
1615 for (curr = f->interrupts.next; curr != &f->interrupts;
1616 curr = curr->next) {
1617 if (curr->u.i.unique == req->unique) {
1618 req->interrupted = 1;
1619 list_del_req(curr);
1620 free(curr);
1621 return NULL;
1622 }
1623 }
1624 curr = f->interrupts.next;
1625 if (curr != &f->interrupts) {
1626 list_del_req(curr);
1627 list_init_req(curr);
1628 return curr;
1629 } else
1630 return NULL;
1631 }
1632
1633 static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1634 {
1635 struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;
1636
1637 if (req->f->op.bmap)
1638 req->f->op.bmap(req, nodeid, arg->blocksize, arg->block);
1639 else
1640 fuse_reply_err(req, ENOSYS);
1641 }
1642
1643 static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1644 {
1645 struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
1646 unsigned int flags = arg->flags;
1647 void *in_buf = arg->in_size ? PARAM(arg) : NULL;
1648 struct fuse_file_info fi;
1649
1650 memset(&fi, 0, sizeof(fi));
1651 fi.fh = arg->fh;
1652 fi.fh_old = fi.fh;
1653
1654 if (sizeof(void *) == 4 && req->f->conn.proto_minor >= 16 &&
1655 !(flags & FUSE_IOCTL_32BIT)) {
1656 req->ioctl_64bit = 1;
1657 }
1658
1659 if (req->f->op.ioctl)
1660 req->f->op.ioctl(req, nodeid, arg->cmd,
1661 (void *)(uintptr_t)arg->arg, &fi, flags,
1662 in_buf, arg->in_size, arg->out_size);
1663 else
1664 fuse_reply_err(req, ENOSYS);
1665 }
1666
1667 void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
1668 {
1669 free(ph);
1670 }
1671
1672 static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1673 {
1674 struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
1675 struct fuse_file_info fi;
1676
1677 memset(&fi, 0, sizeof(fi));
1678 fi.fh = arg->fh;
1679 fi.fh_old = fi.fh;
1680
1681 if (req->f->op.poll) {
1682 struct fuse_pollhandle *ph = NULL;
1683
1684 if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
1685 ph = malloc(sizeof(struct fuse_pollhandle));
1686 if (ph == NULL) {
1687 fuse_reply_err(req, ENOMEM);
1688 return;
1689 }
1690 ph->kh = arg->kh;
1691 ph->ch = req->ch;
1692 ph->f = req->f;
1693 }
1694
1695 req->f->op.poll(req, nodeid, &fi, ph);
1696 } else {
1697 fuse_reply_err(req, ENOSYS);
1698 }
1699 }
1700
1701 static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1702 {
1703 struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
1704 struct fuse_init_out outarg;
1705 struct fuse_ll *f = req->f;
1706 size_t bufsize = fuse_chan_bufsize(req->ch);
1707
1708 (void) nodeid;
1709 if (f->debug) {
1710 fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
1711 if (arg->major == 7 && arg->minor >= 6) {
1712 fprintf(stderr, "flags=0x%08x\n", arg->flags);
1713 fprintf(stderr, "max_readahead=0x%08x\n",
1714 arg->max_readahead);
1715 }
1716 }
1717 f->conn.proto_major = arg->major;
1718 f->conn.proto_minor = arg->minor;
1719 f->conn.capable = 0;
1720 f->conn.want = 0;
1721
1722 memset(&outarg, 0, sizeof(outarg));
1723 outarg.major = FUSE_KERNEL_VERSION;
1724 outarg.minor = FUSE_KERNEL_MINOR_VERSION;
1725
1726 if (arg->major < 7) {
1727 fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
1728 arg->major, arg->minor);
1729 fuse_reply_err(req, EPROTO);
1730 return;
1731 }
1732
1733 if (arg->major > 7) {
1734 /* Wait for a second INIT request with a 7.X version */
1735 send_reply_ok(req, &outarg, sizeof(outarg));
1736 return;
1737 }
1738
1739 if (arg->minor >= 6) {
1740 if (f->conn.async_read)
1741 f->conn.async_read = arg->flags & FUSE_ASYNC_READ;
1742 if (arg->max_readahead < f->conn.max_readahead)
1743 f->conn.max_readahead = arg->max_readahead;
1744 if (arg->flags & FUSE_ASYNC_READ)
1745 f->conn.capable |= FUSE_CAP_ASYNC_READ;
1746 if (arg->flags & FUSE_POSIX_LOCKS)
1747 f->conn.capable |= FUSE_CAP_POSIX_LOCKS;
1748 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
1749 f->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
1750 if (arg->flags & FUSE_EXPORT_SUPPORT)
1751 f->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
1752 if (arg->flags & FUSE_BIG_WRITES)
1753 f->conn.capable |= FUSE_CAP_BIG_WRITES;
1754 if (arg->flags & FUSE_DONT_MASK)
1755 f->conn.capable |= FUSE_CAP_DONT_MASK;
1756 if (arg->flags & FUSE_FLOCK_LOCKS)
1757 f->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
1758 } else {
1759 f->conn.async_read = 0;
1760 f->conn.max_readahead = 0;
1761 }
1762
1763 if (req->f->conn.proto_minor >= 14) {
1764 #ifdef HAVE_SPLICE
1765 #ifdef HAVE_VMSPLICE
1766 f->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
1767 if (f->splice_write)
1768 f->conn.want |= FUSE_CAP_SPLICE_WRITE;
1769 if (f->splice_move)
1770 f->conn.want |= FUSE_CAP_SPLICE_MOVE;
1771 #endif
1772 f->conn.capable |= FUSE_CAP_SPLICE_READ;
1773 if (f->splice_read)
1774 f->conn.want |= FUSE_CAP_SPLICE_READ;
1775 #endif
1776 }
1777
1778 if (f->atomic_o_trunc)
1779 f->conn.want |= FUSE_CAP_ATOMIC_O_TRUNC;
1780 if (f->op.getlk && f->op.setlk && !f->no_remote_posix_lock)
1781 f->conn.want |= FUSE_CAP_POSIX_LOCKS;
1782 if (f->op.flock && !f->no_remote_flock)
1783 f->conn.want |= FUSE_CAP_FLOCK_LOCKS;
1784 if (f->big_writes)
1785 f->conn.want |= FUSE_CAP_BIG_WRITES;
1786
1787 if (bufsize < FUSE_MIN_READ_BUFFER) {
1788 fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
1789 bufsize);
1790 bufsize = FUSE_MIN_READ_BUFFER;
1791 }
1792
1793 bufsize -= 4096;
1794 if (bufsize < f->conn.max_write)
1795 f->conn.max_write = bufsize;
1796
1797 f->got_init = 1;
1798 if (f->op.init)
1799 f->op.init(f->userdata, &f->conn);
1800
1801 if (f->no_splice_read)
1802 f->conn.want &= ~FUSE_CAP_SPLICE_READ;
1803 if (f->no_splice_write)
1804 f->conn.want &= ~FUSE_CAP_SPLICE_WRITE;
1805 if (f->no_splice_move)
1806 f->conn.want &= ~FUSE_CAP_SPLICE_MOVE;
1807
1808 if (f->conn.async_read || (f->conn.want & FUSE_CAP_ASYNC_READ))
1809 outarg.flags |= FUSE_ASYNC_READ;
1810 if (f->conn.want & FUSE_CAP_POSIX_LOCKS)
1811 outarg.flags |= FUSE_POSIX_LOCKS;
1812 if (f->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
1813 outarg.flags |= FUSE_ATOMIC_O_TRUNC;
1814 if (f->conn.want & FUSE_CAP_EXPORT_SUPPORT)
1815 outarg.flags |= FUSE_EXPORT_SUPPORT;
1816 if (f->conn.want & FUSE_CAP_BIG_WRITES)
1817 outarg.flags |= FUSE_BIG_WRITES;
1818 if (f->conn.want & FUSE_CAP_DONT_MASK)
1819 outarg.flags |= FUSE_DONT_MASK;
1820 if (f->conn.want & FUSE_CAP_FLOCK_LOCKS)
1821 outarg.flags |= FUSE_FLOCK_LOCKS;
1822 outarg.max_readahead = f->conn.max_readahead;
1823 outarg.max_write = f->conn.max_write;
1824 if (f->conn.proto_minor >= 13) {
1825 if (f->conn.max_background >= (1 << 16))
1826 f->conn.max_background = (1 << 16) - 1;
1827 if (f->conn.congestion_threshold > f->conn.max_background)
1828 f->conn.congestion_threshold = f->conn.max_background;
1829 if (!f->conn.congestion_threshold) {
1830 f->conn.congestion_threshold =
1831 f->conn.max_background * 3 / 4;
1832 }
1833
1834 outarg.max_background = f->conn.max_background;
1835 outarg.congestion_threshold = f->conn.congestion_threshold;
1836 }
1837
1838 if (f->debug) {
1839 fprintf(stderr, " INIT: %u.%u\n", outarg.major, outarg.minor);
1840 fprintf(stderr, " flags=0x%08x\n", outarg.flags);
1841 fprintf(stderr, " max_readahead=0x%08x\n",
1842 outarg.max_readahead);
1843 fprintf(stderr, " max_write=0x%08x\n", outarg.max_write);
1844 fprintf(stderr, " max_background=%i\n",
1845 outarg.max_background);
1846 fprintf(stderr, " congestion_threshold=%i\n",
1847 outarg.congestion_threshold);
1848 }
1849
1850 send_reply_ok(req, &outarg, arg->minor < 5 ? 8 : sizeof(outarg));
1851 }
1852
1853 static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1854 {
1855 struct fuse_ll *f = req->f;
1856
1857 (void) nodeid;
1858 (void) inarg;
1859
1860 f->got_destroy = 1;
1861 if (f->op.destroy)
1862 f->op.destroy(f->userdata);
1863
1864 send_reply_ok(req, NULL, 0);
1865 }
1866
1867 static void list_del_nreq(struct fuse_notify_req *nreq)
1868 {
1869 struct fuse_notify_req *prev = nreq->prev;
1870 struct fuse_notify_req *next = nreq->next;
1871 prev->next = next;
1872 next->prev = prev;
1873 }
1874
1875 static void list_add_nreq(struct fuse_notify_req *nreq,
1876 struct fuse_notify_req *next)
1877 {
1878 struct fuse_notify_req *prev = next->prev;
1879 nreq->next = next;
1880 nreq->prev = prev;
1881 prev->next = nreq;
1882 next->prev = nreq;
1883 }
1884
1885 static void list_init_nreq(struct fuse_notify_req *nreq)
1886 {
1887 nreq->next = nreq;
1888 nreq->prev = nreq;
1889 }
1890
1891 static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
1892 const void *inarg, const struct fuse_buf *buf)
1893 {
1894 struct fuse_ll *f = req->f;
1895 struct fuse_notify_req *nreq;
1896 struct fuse_notify_req *head;
1897
1898 pthread_mutex_lock(&f->lock);
1899 head = &f->notify_list;
1900 for (nreq = head->next; nreq != head; nreq = nreq->next) {
1901 if (nreq->unique == req->unique) {
1902 list_del_nreq(nreq);
1903 break;
1904 }
1905 }
1906 pthread_mutex_unlock(&f->lock);
1907
1908 if (nreq != head)
1909 nreq->reply(nreq, req, nodeid, inarg, buf);
1910 }
1911
1912 static int send_notify_iov(struct fuse_ll *f, struct fuse_chan *ch,
1913 int notify_code, struct iovec *iov, int count)
1914 {
1915 struct fuse_out_header out;
1916
1917 if (!f->got_init)
1918 return -ENOTCONN;
1919
1920 out.unique = 0;
1921 out.error = notify_code;
1922 iov[0].iov_base = &out;
1923 iov[0].iov_len = sizeof(struct fuse_out_header);
1924
1925 return fuse_send_msg(f, ch, iov, count);
1926 }
1927
1928 int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
1929 {
1930 if (ph != NULL) {
1931 struct fuse_notify_poll_wakeup_out outarg;
1932 struct iovec iov[2];
1933
1934 outarg.kh = ph->kh;
1935
1936 iov[1].iov_base = &outarg;
1937 iov[1].iov_len = sizeof(outarg);
1938
1939 return send_notify_iov(ph->f, ph->ch, FUSE_NOTIFY_POLL, iov, 2);
1940 } else {
1941 return 0;
1942 }
1943 }
1944
1945 int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, fuse_ino_t ino,
1946 off_t off, off_t len)
1947 {
1948 struct fuse_notify_inval_inode_out outarg;
1949 struct fuse_ll *f;
1950 struct iovec iov[2];
1951
1952 if (!ch)
1953 return -EINVAL;
1954
1955 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
1956 if (!f)
1957 return -ENODEV;
1958
1959 outarg.ino = ino;
1960 outarg.off = off;
1961 outarg.len = len;
1962
1963 iov[1].iov_base = &outarg;
1964 iov[1].iov_len = sizeof(outarg);
1965
1966 return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2);
1967 }
1968
1969 int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, fuse_ino_t parent,
1970 const char *name, size_t namelen)
1971 {
1972 struct fuse_notify_inval_entry_out outarg;
1973 struct fuse_ll *f;
1974 struct iovec iov[3];
1975
1976 if (!ch)
1977 return -EINVAL;
1978
1979 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
1980 if (!f)
1981 return -ENODEV;
1982
1983 outarg.parent = parent;
1984 outarg.namelen = namelen;
1985 outarg.padding = 0;
1986
1987 iov[1].iov_base = &outarg;
1988 iov[1].iov_len = sizeof(outarg);
1989 iov[2].iov_base = (void *)name;
1990 iov[2].iov_len = namelen + 1;
1991
1992 return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
1993 }
1994
1995 int fuse_lowlevel_notify_store(struct fuse_chan *ch, fuse_ino_t ino,
1996 off_t offset, struct fuse_bufvec *bufv,
1997 enum fuse_buf_copy_flags flags)
1998 {
1999 struct fuse_out_header out;
2000 struct fuse_notify_store_out outarg;
2001 struct fuse_ll *f;
2002 struct iovec iov[3];
2003 size_t size = fuse_buf_size(bufv);
2004 int res;
2005
2006 if (!ch)
2007 return -EINVAL;
2008
2009 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2010 if (!f)
2011 return -ENODEV;
2012
2013 out.unique = 0;
2014 out.error = FUSE_NOTIFY_STORE;
2015
2016 outarg.nodeid = ino;
2017 outarg.offset = offset;
2018 outarg.size = size;
2019
2020 iov[0].iov_base = &out;
2021 iov[0].iov_len = sizeof(out);
2022 iov[1].iov_base = &outarg;
2023 iov[1].iov_len = sizeof(outarg);
2024
2025 res = fuse_send_data_iov(f, ch, iov, 2, bufv, flags);
2026 if (res > 0)
2027 res = -res;
2028
2029 return res;
2030 }
2031
2032 struct fuse_retrieve_req {
2033 struct fuse_notify_req nreq;
2034 void *cookie;
2035 };
2036
2037 static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
2038 fuse_req_t req, fuse_ino_t ino,
2039 const void *inarg,
2040 const struct fuse_buf *ibuf)
2041 {
2042 struct fuse_ll *f = req->f;
2043 struct fuse_retrieve_req *rreq =
2044 container_of(nreq, struct fuse_retrieve_req, nreq);
2045 const struct fuse_notify_retrieve_in *arg = inarg;
2046 struct fuse_bufvec bufv = {
2047 .buf[0] = *ibuf,
2048 .count = 1,
2049 };
2050
2051 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
2052 bufv.buf[0].mem = PARAM(arg);
2053
2054 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
2055 sizeof(struct fuse_notify_retrieve_in);
2056
2057 if (bufv.buf[0].size < arg->size) {
2058 fprintf(stderr, "fuse: retrieve reply: buffer size too small\n");
2059 fuse_reply_none(req);
2060 goto out;
2061 }
2062 bufv.buf[0].size = arg->size;
2063
2064 if (req->f->op.retrieve_reply)
2065 req->f->op.retrieve_reply(rreq->cookie, ino, arg->offset, &bufv);
2066 fuse_reply_none(req);
2067 free(rreq);
2068
2069 out:
2070 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
2071 fuse_ll_clear_pipe(f);
2072 }
2073
2074 int fuse_lowlevel_notify_retrieve(struct fuse_chan *ch, fuse_ino_t ino,
2075 size_t size, off_t offset, void *cookie)
2076 {
2077 struct fuse_notify_retrieve_out outarg;
2078 struct fuse_ll *f;
2079 struct iovec iov[2];
2080 struct fuse_retrieve_req *rreq;
2081 int err;
2082
2083 if (!ch)
2084 return -EINVAL;
2085
2086 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2087 if (!f)
2088 return -ENODEV;
2089
2090 rreq = malloc(sizeof(*rreq));
2091 if (rreq == NULL)
2092 return -ENOMEM;
2093
2094 pthread_mutex_lock(&f->lock);
2095 rreq->cookie = cookie;
2096 rreq->nreq.unique = f->notify_ctr++;
2097 rreq->nreq.reply = fuse_ll_retrieve_reply;
2098 list_add_nreq(&rreq->nreq, &f->notify_list);
2099 pthread_mutex_unlock(&f->lock);
2100
2101 outarg.notify_unique = rreq->nreq.unique;
2102 outarg.nodeid = ino;
2103 outarg.offset = offset;
2104 outarg.size = size;
2105
2106 iov[1].iov_base = &outarg;
2107 iov[1].iov_len = sizeof(outarg);
2108
2109 err = send_notify_iov(f, ch, FUSE_NOTIFY_RETRIEVE, iov, 2);
2110 if (err) {
2111 pthread_mutex_lock(&f->lock);
2112 list_del_nreq(&rreq->nreq);
2113 pthread_mutex_unlock(&f->lock);
2114 free(rreq);
2115 }
2116
2117 return err;
2118 }
2119
2120 void *fuse_req_userdata(fuse_req_t req)
2121 {
2122 return req->f->userdata;
2123 }
2124
2125 const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
2126 {
2127 return &req->ctx;
2128 }
2129
2130 /*
2131 * The size of fuse_ctx got extended, so need to be careful about
2132 * incompatibility (i.e. a new binary cannot work with an old
2133 * library).
2134 */
2135 const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req);
2136 const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req)
2137 {
2138 return fuse_req_ctx(req);
2139 }
2140 #ifndef __NetBSD__
2141 FUSE_SYMVER(".symver fuse_req_ctx_compat24,fuse_req_ctx@FUSE_2.4");
2142 #endif
2143
2144
2145 void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
2146 void *data)
2147 {
2148 pthread_mutex_lock(&req->lock);
2149 pthread_mutex_lock(&req->f->lock);
2150 req->u.ni.func = func;
2151 req->u.ni.data = data;
2152 pthread_mutex_unlock(&req->f->lock);
2153 if (req->interrupted && func)
2154 func(req, data);
2155 pthread_mutex_unlock(&req->lock);
2156 }
2157
2158 int fuse_req_interrupted(fuse_req_t req)
2159 {
2160 int interrupted;
2161
2162 pthread_mutex_lock(&req->f->lock);
2163 interrupted = req->interrupted;
2164 pthread_mutex_unlock(&req->f->lock);
2165
2166 return interrupted;
2167 }
2168
2169 static struct {
2170 void (*func)(fuse_req_t, fuse_ino_t, const void *);
2171 const char *name;
2172 } fuse_ll_ops[] = {
2173 [FUSE_LOOKUP] = { do_lookup, "LOOKUP" },
2174 [FUSE_FORGET] = { do_forget, "FORGET" },
2175 [FUSE_GETATTR] = { do_getattr, "GETATTR" },
2176 [FUSE_SETATTR] = { do_setattr, "SETATTR" },
2177 [FUSE_READLINK] = { do_readlink, "READLINK" },
2178 [FUSE_SYMLINK] = { do_symlink, "SYMLINK" },
2179 [FUSE_MKNOD] = { do_mknod, "MKNOD" },
2180 [FUSE_MKDIR] = { do_mkdir, "MKDIR" },
2181 [FUSE_UNLINK] = { do_unlink, "UNLINK" },
2182 [FUSE_RMDIR] = { do_rmdir, "RMDIR" },
2183 [FUSE_RENAME] = { do_rename, "RENAME" },
2184 [FUSE_LINK] = { do_link, "LINK" },
2185 [FUSE_OPEN] = { do_open, "OPEN" },
2186 [FUSE_READ] = { do_read, "READ" },
2187 [FUSE_WRITE] = { do_write, "WRITE" },
2188 [FUSE_STATFS] = { do_statfs, "STATFS" },
2189 [FUSE_RELEASE] = { do_release, "RELEASE" },
2190 [FUSE_FSYNC] = { do_fsync, "FSYNC" },
2191 [FUSE_SETXATTR] = { do_setxattr, "SETXATTR" },
2192 [FUSE_GETXATTR] = { do_getxattr, "GETXATTR" },
2193 [FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" },
2194 [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
2195 [FUSE_FLUSH] = { do_flush, "FLUSH" },
2196 [FUSE_INIT] = { do_init, "INIT" },
2197 [FUSE_OPENDIR] = { do_opendir, "OPENDIR" },
2198 [FUSE_READDIR] = { do_readdir, "READDIR" },
2199 [FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" },
2200 [FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" },
2201 [FUSE_GETLK] = { do_getlk, "GETLK" },
2202 [FUSE_SETLK] = { do_setlk, "SETLK" },
2203 [FUSE_SETLKW] = { do_setlkw, "SETLKW" },
2204 [FUSE_ACCESS] = { do_access, "ACCESS" },
2205 [FUSE_CREATE] = { do_create, "CREATE" },
2206 [FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" },
2207 [FUSE_BMAP] = { do_bmap, "BMAP" },
2208 [FUSE_IOCTL] = { do_ioctl, "IOCTL" },
2209 [FUSE_POLL] = { do_poll, "POLL" },
2210 [FUSE_DESTROY] = { do_destroy, "DESTROY" },
2211 [FUSE_NOTIFY_REPLY] = { (void *) 1, "NOTIFY_REPLY" },
2212 [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
2213 [CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" },
2214 };
2215
2216 #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))
2217
2218 static const char *opname(enum fuse_opcode opcode)
2219 {
2220 if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
2221 return "???";
2222 else
2223 return fuse_ll_ops[opcode].name;
2224 }
2225
2226 static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst,
2227 struct fuse_bufvec *src)
2228 {
2229 int res = fuse_buf_copy(dst, src, 0);
2230 if (res < 0) {
2231 fprintf(stderr, "fuse: copy from pipe: %s\n", strerror(-res));
2232 return res;
2233 }
2234 if (res < fuse_buf_size(dst)) {
2235 fprintf(stderr, "fuse: copy from pipe: short read\n");
2236 return -1;
2237 }
2238 return 0;
2239 }
2240
2241 static void fuse_ll_process_buf(void *data, const struct fuse_buf *buf,
2242 struct fuse_chan *ch)
2243 {
2244 struct fuse_ll *f = (struct fuse_ll *) data;
2245 const size_t write_header_size = sizeof(struct fuse_in_header) +
2246 sizeof(struct fuse_write_in);
2247 struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
2248 struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size);
2249 struct fuse_in_header *in;
2250 const void *inarg;
2251 struct fuse_req *req;
2252 void *mbuf = NULL;
2253 int err;
2254 int res;
2255
2256 if (buf->flags & FUSE_BUF_IS_FD) {
2257 if (buf->size < tmpbuf.buf[0].size)
2258 tmpbuf.buf[0].size = buf->size;
2259
2260 mbuf = malloc(tmpbuf.buf[0].size);
2261 if (mbuf == NULL) {
2262 fprintf(stderr, "fuse: failed to allocate header\n");
2263 goto clear_pipe;
2264 }
2265 tmpbuf.buf[0].mem = mbuf;
2266
2267 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2268 if (res < 0)
2269 goto clear_pipe;
2270
2271 in = mbuf;
2272 } else {
2273 in = buf->mem;
2274 }
2275
2276 req = fuse_ll_alloc_req(f);
2277 if (req == NULL)
2278 goto clear_pipe;
2279
2280 req->unique = in->unique;
2281 req->ctx.uid = in->uid;
2282 req->ctx.gid = in->gid;
2283 req->ctx.pid = in->pid;
2284 req->ch = ch;
2285
2286 if (f->debug)
2287 fprintf(stderr,
2288 "unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %zu, pid: %u\n",
2289 (unsigned long long) in->unique,
2290 opname((enum fuse_opcode) in->opcode), in->opcode,
2291 (unsigned long) in->nodeid, buf->size, in->pid);
2292
2293
2294 err = EIO;
2295 if (!f->got_init) {
2296 enum fuse_opcode expected;
2297
2298 expected = f->cuse_data ? CUSE_INIT : FUSE_INIT;
2299 if (in->opcode != expected)
2300 goto reply_err;
2301 } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
2302 goto reply_err;
2303
2304 err = EACCES;
2305 if (f->allow_root && in->uid != f->owner && in->uid != 0 &&
2306 in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
2307 in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
2308 in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
2309 in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR &&
2310 in->opcode != FUSE_NOTIFY_REPLY)
2311 goto reply_err;
2312
2313 err = ENOSYS;
2314 if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
2315 goto reply_err;
2316 if (in->opcode != FUSE_INTERRUPT) {
2317 struct fuse_req *intr;
2318 pthread_mutex_lock(&f->lock);
2319 intr = check_interrupt(f, req);
2320 list_add_req(req, &f->list);
2321 pthread_mutex_unlock(&f->lock);
2322 if (intr)
2323 fuse_reply_err(intr, EAGAIN);
2324 }
2325
2326 if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size &&
2327 (in->opcode != FUSE_WRITE || !f->op.write_buf) &&
2328 in->opcode != FUSE_NOTIFY_REPLY) {
2329 void *newmbuf;
2330
2331 err = ENOMEM;
2332 newmbuf = realloc(mbuf, buf->size);
2333 if (newmbuf == NULL)
2334 goto reply_err;
2335 mbuf = newmbuf;
2336
2337 tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size);
2338 tmpbuf.buf[0].mem = mbuf + write_header_size;
2339
2340 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2341 err = -res;
2342 if (res < 0)
2343 goto reply_err;
2344
2345 in = mbuf;
2346 }
2347
2348 inarg = (void *) &in[1];
2349 if (in->opcode == FUSE_WRITE && f->op.write_buf)
2350 do_write_buf(req, in->nodeid, inarg, buf);
2351 else if (in->opcode == FUSE_NOTIFY_REPLY)
2352 do_notify_reply(req, in->nodeid, inarg, buf);
2353 else
2354 fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
2355
2356 out_free:
2357 free(mbuf);
2358 return;
2359
2360 reply_err:
2361 fuse_reply_err(req, err);
2362 clear_pipe:
2363 if (buf->flags & FUSE_BUF_IS_FD)
2364 fuse_ll_clear_pipe(f);
2365 goto out_free;
2366 }
2367
2368 static void fuse_ll_process(void *data, const char *buf, size_t len,
2369 struct fuse_chan *ch)
2370 {
2371 struct fuse_buf fbuf = {
2372 .mem = (void *) buf,
2373 .size = len,
2374 };
2375
2376 fuse_ll_process_buf(data, &fbuf, ch);
2377 }
2378
2379 enum {
2380 KEY_HELP,
2381 KEY_VERSION,
2382 };
2383
2384 static struct fuse_opt fuse_ll_opts[] = {
2385 { "debug", offsetof(struct fuse_ll, debug), 1 },
2386 { "-d", offsetof(struct fuse_ll, debug), 1 },
2387 { "allow_root", offsetof(struct fuse_ll, allow_root), 1 },
2388 { "max_write=%u", offsetof(struct fuse_ll, conn.max_write), 0 },
2389 { "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 },
2390 { "max_background=%u", offsetof(struct fuse_ll, conn.max_background), 0 },
2391 { "congestion_threshold=%u",
2392 offsetof(struct fuse_ll, conn.congestion_threshold), 0 },
2393 { "async_read", offsetof(struct fuse_ll, conn.async_read), 1 },
2394 { "sync_read", offsetof(struct fuse_ll, conn.async_read), 0 },
2395 { "atomic_o_trunc", offsetof(struct fuse_ll, atomic_o_trunc), 1},
2396 { "no_remote_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1},
2397 { "no_remote_lock", offsetof(struct fuse_ll, no_remote_flock), 1},
2398 { "no_remote_flock", offsetof(struct fuse_ll, no_remote_flock), 1},
2399 { "no_remote_posix_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1},
2400 { "big_writes", offsetof(struct fuse_ll, big_writes), 1},
2401 { "splice_write", offsetof(struct fuse_ll, splice_write), 1},
2402 { "no_splice_write", offsetof(struct fuse_ll, no_splice_write), 1},
2403 { "splice_move", offsetof(struct fuse_ll, splice_move), 1},
2404 { "no_splice_move", offsetof(struct fuse_ll, no_splice_move), 1},
2405 { "splice_read", offsetof(struct fuse_ll, splice_read), 1},
2406 { "no_splice_read", offsetof(struct fuse_ll, no_splice_read), 1},
2407 FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD),
2408 FUSE_OPT_KEY("-h", KEY_HELP),
2409 FUSE_OPT_KEY("--help", KEY_HELP),
2410 FUSE_OPT_KEY("-V", KEY_VERSION),
2411 FUSE_OPT_KEY("--version", KEY_VERSION),
2412 FUSE_OPT_END
2413 };
2414
2415 static void fuse_ll_version(void)
2416 {
2417 fprintf(stderr, "using FUSE kernel interface version %i.%i\n",
2418 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
2419 }
2420
2421 static void fuse_ll_help(void)
2422 {
2423 fprintf(stderr,
2424 " -o max_write=N set maximum size of write requests\n"
2425 " -o max_readahead=N set maximum readahead\n"
2426 " -o max_background=N set number of maximum background requests\n"
2427 " -o congestion_threshold=N set kernel's congestion threshold\n"
2428 " -o async_read perform reads asynchronously (default)\n"
2429 " -o sync_read perform reads synchronously\n"
2430 " -o atomic_o_trunc enable atomic open+truncate support\n"
2431 " -o big_writes enable larger than 4kB writes\n"
2432 " -o no_remote_lock disable remote file locking\n"
2433 " -o no_remote_flock disable remote file locking (BSD)\n"
2434 " -o no_remote_posix_lock disable remove file locking (POSIX)\n"
2435 " -o [no_]splice_write use splice to write to the fuse device\n"
2436 " -o [no_]splice_move move data while splicing to the fuse device\n"
2437 " -o [no_]splice_read use splice to read from the fuse device\n"
2438 );
2439 }
2440
2441 static int fuse_ll_opt_proc(void *data, const char *arg, int key,
2442 struct fuse_args *outargs)
2443 {
2444 (void) data; (void) outargs;
2445
2446 switch (key) {
2447 case KEY_HELP:
2448 fuse_ll_help();
2449 break;
2450
2451 case KEY_VERSION:
2452 fuse_ll_version();
2453 break;
2454
2455 default:
2456 fprintf(stderr, "fuse: unknown option `%s'\n", arg);
2457 }
2458
2459 return -1;
2460 }
2461
2462 int fuse_lowlevel_is_lib_option(const char *opt)
2463 {
2464 return fuse_opt_match(fuse_ll_opts, opt);
2465 }
2466
2467 static void fuse_ll_destroy(void *data)
2468 {
2469 struct fuse_ll *f = (struct fuse_ll *) data;
2470 struct fuse_ll_pipe *llp;
2471
2472 if (f->got_init && !f->got_destroy) {
2473 if (f->op.destroy)
2474 f->op.destroy(f->userdata);
2475 }
2476 llp = pthread_getspecific(f->pipe_key);
2477 if (llp != NULL)
2478 fuse_ll_pipe_free(llp);
2479 pthread_key_delete(f->pipe_key);
2480 pthread_mutex_destroy(&f->lock);
2481 free(f->cuse_data);
2482 free(f);
2483 }
2484
2485 static void fuse_ll_pipe_destructor(void *data)
2486 {
2487 struct fuse_ll_pipe *llp = data;
2488 fuse_ll_pipe_free(llp);
2489 }
2490
2491 #ifdef HAVE_SPLICE
2492 static int fuse_ll_receive_buf(struct fuse_session *se, struct fuse_buf *buf,
2493 struct fuse_chan **chp)
2494 {
2495 struct fuse_chan *ch = *chp;
2496 struct fuse_ll *f = fuse_session_data(se);
2497 size_t bufsize = buf->size;
2498 struct fuse_ll_pipe *llp;
2499 struct fuse_buf tmpbuf;
2500 int err;
2501 int res;
2502
2503 if (f->conn.proto_minor < 14 || !(f->conn.want & FUSE_CAP_SPLICE_READ))
2504 goto fallback;
2505
2506 llp = fuse_ll_get_pipe(f);
2507 if (llp == NULL)
2508 goto fallback;
2509
2510 if (llp->size < bufsize) {
2511 if (llp->can_grow) {
2512 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize);
2513 if (res == -1) {
2514 llp->can_grow = 0;
2515 goto fallback;
2516 }
2517 llp->size = res;
2518 }
2519 if (llp->size < bufsize)
2520 goto fallback;
2521 }
2522
2523 res = splice(fuse_chan_fd(ch), NULL, llp->pipe[1], NULL, bufsize, 0);
2524 err = errno;
2525
2526 if (fuse_session_exited(se))
2527 return 0;
2528
2529 if (res == -1) {
2530 if (err == ENODEV) {
2531 fuse_session_exit(se);
2532 return 0;
2533 }
2534 if (err != EINTR && err != EAGAIN)
2535 perror("fuse: splice from device");
2536 return -err;
2537 }
2538
2539 if (res < sizeof(struct fuse_in_header)) {
2540 fprintf(stderr, "short splice from fuse device\n");
2541 return -EIO;
2542 }
2543
2544 tmpbuf = (struct fuse_buf) {
2545 .size = res,
2546 .flags = FUSE_BUF_IS_FD,
2547 .fd = llp->pipe[0],
2548 };
2549
2550 /*
2551 * Don't bother with zero copy for small requests.
2552 * fuse_loop_mt() needs to check for FORGET so this more than
2553 * just an optimization.
2554 */
2555 if (res < sizeof(struct fuse_in_header) +
2556 sizeof(struct fuse_write_in) + pagesize) {
2557 struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 };
2558 struct fuse_bufvec dst = { .buf[0] = *buf, .count = 1 };
2559
2560 res = fuse_buf_copy(&dst, &src, 0);
2561 if (res < 0) {
2562 fprintf(stderr, "fuse: copy from pipe: %s\n",
2563 strerror(-res));
2564 fuse_ll_clear_pipe(f);
2565 return res;
2566 }
2567 if (res < tmpbuf.size) {
2568 fprintf(stderr, "fuse: copy from pipe: short read\n");
2569 fuse_ll_clear_pipe(f);
2570 return -EIO;
2571 }
2572 buf->size = tmpbuf.size;
2573 return buf->size;
2574 }
2575
2576 *buf = tmpbuf;
2577
2578 return res;
2579
2580 fallback:
2581 res = fuse_chan_recv(chp, buf->mem, bufsize);
2582 if (res <= 0)
2583 return res;
2584
2585 buf->size = res;
2586
2587 return res;
2588 }
2589 #else
2590 static int fuse_ll_receive_buf(struct fuse_session *se, struct fuse_buf *buf,
2591 struct fuse_chan **chp)
2592 {
2593 (void) se;
2594
2595 int res = fuse_chan_recv(chp, buf->mem, buf->size);
2596 if (res <= 0)
2597 return res;
2598
2599 buf->size = res;
2600
2601 return res;
2602 }
2603 #endif
2604
2605
2606 /*
2607 * always call fuse_lowlevel_new_common() internally, to work around a
2608 * misfeature in the FreeBSD runtime linker, which links the old
2609 * version of a symbol to internal references.
2610 */
2611 struct fuse_session *fuse_lowlevel_new_common(struct fuse_args *args,
2612 const struct fuse_lowlevel_ops *op,
2613 size_t op_size, void *userdata)
2614 {
2615 int err;
2616 struct fuse_ll *f;
2617 struct fuse_session *se;
2618 struct fuse_session_ops sop = {
2619 .process = fuse_ll_process,
2620 .destroy = fuse_ll_destroy,
2621 };
2622
2623 if (sizeof(struct fuse_lowlevel_ops) < op_size) {
2624 fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
2625 op_size = sizeof(struct fuse_lowlevel_ops);
2626 }
2627
2628 f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll));
2629 if (f == NULL) {
2630 fprintf(stderr, "fuse: failed to allocate fuse object\n");
2631 goto out;
2632 }
2633
2634 f->conn.async_read = 1;
2635 f->conn.max_write = UINT_MAX;
2636 f->conn.max_readahead = UINT_MAX;
2637 f->atomic_o_trunc = 0;
2638 list_init_req(&f->list);
2639 list_init_req(&f->interrupts);
2640 list_init_nreq(&f->notify_list);
2641 f->notify_ctr = 1;
2642 fuse_mutex_init(&f->lock);
2643
2644 err = pthread_key_create(&f->pipe_key, fuse_ll_pipe_destructor);
2645 if (err) {
2646 fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
2647 strerror(err));
2648 goto out_free;
2649 }
2650
2651 if (fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1)
2652 goto out_key_destroy;
2653
2654 if (f->debug)
2655 fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION);
2656
2657 memcpy(&f->op, op, op_size);
2658 f->owner = getuid();
2659 f->userdata = userdata;
2660
2661 se = fuse_session_new(&sop, f);
2662 if (!se)
2663 goto out_key_destroy;
2664
2665 se->receive_buf = fuse_ll_receive_buf;
2666 se->process_buf = fuse_ll_process_buf;
2667
2668 return se;
2669
2670 out_key_destroy:
2671 pthread_key_delete(f->pipe_key);
2672 out_free:
2673 pthread_mutex_destroy(&f->lock);
2674 free(f);
2675 out:
2676 return NULL;
2677 }
2678
2679
2680 struct fuse_session *fuse_lowlevel_new(struct fuse_args *args,
2681 const struct fuse_lowlevel_ops *op,
2682 size_t op_size, void *userdata)
2683 {
2684 return fuse_lowlevel_new_common(args, op, op_size, userdata);
2685 }
2686
2687 #ifdef linux
2688 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
2689 {
2690 char *buf;
2691 size_t bufsize = 1024;
2692 char path[128];
2693 int ret;
2694 int fd;
2695 unsigned long pid = req->ctx.pid;
2696 char *s;
2697
2698 sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);
2699
2700 retry:
2701 buf = malloc(bufsize);
2702 if (buf == NULL)
2703 return -ENOMEM;
2704
2705 ret = -EIO;
2706 fd = open(path, O_RDONLY);
2707 if (fd == -1)
2708 goto out_free;
2709
2710 ret = read(fd, buf, bufsize);
2711 close(fd);
2712 if (ret == -1) {
2713 ret = -EIO;
2714 goto out_free;
2715 }
2716
2717 if (ret == bufsize) {
2718 free(buf);
2719 bufsize *= 4;
2720 goto retry;
2721 }
2722
2723 ret = -EIO;
2724 s = strstr(buf, "\nGroups:");
2725 if (s == NULL)
2726 goto out_free;
2727
2728 s += 8;
2729 ret = 0;
2730 while (1) {
2731 char *end;
2732 unsigned long val = strtoul(s, &end, 0);
2733 if (end == s)
2734 break;
2735
2736 s = end;
2737 if (ret < size)
2738 list[ret] = val;
2739 ret++;
2740 }
2741
2742 out_free:
2743 free(buf);
2744 return ret;
2745 }
2746 #else /* linux */
2747 /*
2748 * This is currently not implemented on other than Linux...
2749 */
2750 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
2751 {
2752 return -ENOSYS;
2753 }
2754 #endif
2755
2756 #if !defined(__FreeBSD__) && !defined(__NetBSD__)
2757
2758 static void fill_open_compat(struct fuse_open_out *arg,
2759 const struct fuse_file_info_compat *f)
2760 {
2761 arg->fh = f->fh;
2762 if (f->direct_io)
2763 arg->open_flags |= FOPEN_DIRECT_IO;
2764 if (f->keep_cache)
2765 arg->open_flags |= FOPEN_KEEP_CACHE;
2766 }
2767
2768 static void convert_statfs_compat(const struct statfs *compatbuf,
2769 struct statvfs *buf)
2770 {
2771 buf->f_bsize = compatbuf->f_bsize;
2772 buf->f_blocks = compatbuf->f_blocks;
2773 buf->f_bfree = compatbuf->f_bfree;
2774 buf->f_bavail = compatbuf->f_bavail;
2775 buf->f_files = compatbuf->f_files;
2776 buf->f_ffree = compatbuf->f_ffree;
2777 buf->f_namemax = compatbuf->f_namelen;
2778 }
2779
2780 int fuse_reply_open_compat(fuse_req_t req,
2781 const struct fuse_file_info_compat *f)
2782 {
2783 struct fuse_open_out arg;
2784
2785 memset(&arg, 0, sizeof(arg));
2786 fill_open_compat(&arg, f);
2787 return send_reply_ok(req, &arg, sizeof(arg));
2788 }
2789
2790 int fuse_reply_statfs_compat(fuse_req_t req, const struct statfs *stbuf)
2791 {
2792 struct statvfs newbuf;
2793
2794 memset(&newbuf, 0, sizeof(newbuf));
2795 convert_statfs_compat(stbuf, &newbuf);
2796
2797 return fuse_reply_statfs(req, &newbuf);
2798 }
2799
2800 struct fuse_session *fuse_lowlevel_new_compat(const char *opts,
2801 const struct fuse_lowlevel_ops_compat *op,
2802 size_t op_size, void *userdata)
2803 {
2804 struct fuse_session *se;
2805 struct fuse_args args = FUSE_ARGS_INIT(0, NULL);
2806
2807 if (opts &&
2808 (fuse_opt_add_arg(&args, "") == -1 ||
2809 fuse_opt_add_arg(&args, "-o") == -1 ||
2810 fuse_opt_add_arg(&args, opts) == -1)) {
2811 fuse_opt_free_args(&args);
2812 return NULL;
2813 }
2814 se = fuse_lowlevel_new(&args, (const struct fuse_lowlevel_ops *) op,
2815 op_size, userdata);
2816 fuse_opt_free_args(&args);
2817
2818 return se;
2819 }
2820
2821 struct fuse_ll_compat_conf {
2822 unsigned max_read;
2823 int set_max_read;
2824 };
2825
2826 static const struct fuse_opt fuse_ll_opts_compat[] = {
2827 { "max_read=", offsetof(struct fuse_ll_compat_conf, set_max_read), 1 },
2828 { "max_read=%u", offsetof(struct fuse_ll_compat_conf, max_read), 0 },
2829 FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_KEEP),
2830 FUSE_OPT_END
2831 };
2832
2833 int fuse_sync_compat_args(struct fuse_args *args)
2834 {
2835 struct fuse_ll_compat_conf conf;
2836
2837 memset(&conf, 0, sizeof(conf));
2838 if (fuse_opt_parse(args, &conf, fuse_ll_opts_compat, NULL) == -1)
2839 return -1;
2840
2841 if (fuse_opt_insert_arg(args, 1, "-osync_read"))
2842 return -1;
2843
2844 if (conf.set_max_read) {
2845 char tmpbuf[64];
2846
2847 sprintf(tmpbuf, "-omax_readahead=%u", conf.max_read);
2848 if (fuse_opt_insert_arg(args, 1, tmpbuf) == -1)
2849 return -1;
2850 }
2851 return 0;
2852 }
2853
2854 FUSE_SYMVER(".symver fuse_reply_statfs_compat,fuse_reply_statfs@FUSE_2.4");
2855 FUSE_SYMVER(".symver fuse_reply_open_compat,fuse_reply_open@FUSE_2.4");
2856 FUSE_SYMVER(".symver fuse_lowlevel_new_compat,fuse_lowlevel_new@FUSE_2.4");
2857
2858 #else /* __FreeBSD__ || __NetBSD__ */
2859
2860 int fuse_sync_compat_args(struct fuse_args *args)
2861 {
2862 (void) args;
2863 return 0;
2864 }
2865
2866 #endif /* __FreeBSD__ || __NetBSD__ */
2867
2868 struct fuse_session *fuse_lowlevel_new_compat25(struct fuse_args *args,
2869 const struct fuse_lowlevel_ops_compat25 *op,
2870 size_t op_size, void *userdata)
2871 {
2872 if (fuse_sync_compat_args(args) == -1)
2873 return NULL;
2874
2875 return fuse_lowlevel_new_common(args,
2876 (const struct fuse_lowlevel_ops *) op,
2877 op_size, userdata);
2878 }
2879
2880 FUSE_SYMVER(".symver fuse_lowlevel_new_compat25,fuse_lowlevel_new@FUSE_2.5");
mirror for fuse