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Interpret octal escape codes in options
[fuse.git] / lib / fuse_lowlevel.c
bloba0d4887655c2dea4028c1aec0cd4d3901466f814
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 /* Optimize common case */
441 if (buf->count == 1 && buf->idx == 0 && buf->off == 0 &&
442 !(buf->buf[0].flags & FUSE_BUF_IS_FD)) {
443 /* FIXME: also avoid memory copy if there are multiple buffers
444 but none of them contain an fd */
445
446 iov[iov_count].iov_base = buf->buf[0].mem;
447 iov[iov_count].iov_len = len;
448 iov_count++;
449 return fuse_send_msg(f, ch, iov, iov_count);
450 }
451
452 res = posix_memalign(&mbuf, pagesize, len);
453 if (res != 0)
454 return res;
455
456 mem_buf.buf[0].mem = mbuf;
457 res = fuse_buf_copy(&mem_buf, buf, 0);
458 if (res < 0) {
459 free(mbuf);
460 return -res;
461 }
462 len = res;
463
464 iov[iov_count].iov_base = mbuf;
465 iov[iov_count].iov_len = len;
466 iov_count++;
467 res = fuse_send_msg(f, ch, iov, iov_count);
468 free(mbuf);
469
470 return res;
471 }
472
473 struct fuse_ll_pipe {
474 size_t size;
475 int can_grow;
476 int pipe[2];
477 };
478
479 static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp)
480 {
481 close(llp->pipe[0]);
482 close(llp->pipe[1]);
483 free(llp);
484 }
485
486 #ifdef HAVE_SPLICE
487 static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_ll *f)
488 {
489 struct fuse_ll_pipe *llp = pthread_getspecific(f->pipe_key);
490 if (llp == NULL) {
491 int res;
492
493 llp = malloc(sizeof(struct fuse_ll_pipe));
494 if (llp == NULL)
495 return NULL;
496
497 res = pipe(llp->pipe);
498 if (res == -1) {
499 free(llp);
500 return NULL;
501 }
502
503 if (fcntl(llp->pipe[0], F_SETFL, O_NONBLOCK) == -1 ||
504 fcntl(llp->pipe[1], F_SETFL, O_NONBLOCK) == -1) {
505 close(llp->pipe[0]);
506 close(llp->pipe[1]);
507 free(llp);
508 return NULL;
509 }
510
511 /*
512 *the default size is 16 pages on linux
513 */
514 llp->size = pagesize * 16;
515 llp->can_grow = 1;
516
517 pthread_setspecific(f->pipe_key, llp);
518 }
519
520 return llp;
521 }
522 #endif
523
524 static void fuse_ll_clear_pipe(struct fuse_ll *f)
525 {
526 struct fuse_ll_pipe *llp = pthread_getspecific(f->pipe_key);
527 if (llp) {
528 pthread_setspecific(f->pipe_key, NULL);
529 fuse_ll_pipe_free(llp);
530 }
531 }
532
533 #if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE)
534 static int read_back(int fd, char *buf, size_t len)
535 {
536 int res;
537
538 res = read(fd, buf, len);
539 if (res == -1) {
540 fprintf(stderr, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno));
541 return -EIO;
542 }
543 if (res != len) {
544 fprintf(stderr, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len);
545 return -EIO;
546 }
547 return 0;
548 }
549
550 static int fuse_send_data_iov(struct fuse_ll *f, struct fuse_chan *ch,
551 struct iovec *iov, int iov_count,
552 struct fuse_bufvec *buf, unsigned int flags)
553 {
554 int res;
555 size_t len = fuse_buf_size(buf);
556 struct fuse_out_header *out = iov[0].iov_base;
557 struct fuse_ll_pipe *llp;
558 int splice_flags;
559 size_t pipesize;
560 size_t total_fd_size;
561 size_t idx;
562 size_t headerlen;
563 struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len);
564
565 if (f->broken_splice_nonblock)
566 goto fallback;
567
568 if (flags & FUSE_BUF_NO_SPLICE)
569 goto fallback;
570
571 total_fd_size = 0;
572 for (idx = buf->idx; idx < buf->count; idx++) {
573 if (buf->buf[idx].flags & FUSE_BUF_IS_FD) {
574 total_fd_size = buf->buf[idx].size;
575 if (idx == buf->idx)
576 total_fd_size -= buf->off;
577 }
578 }
579 if (total_fd_size < 2 * pagesize)
580 goto fallback;
581
582 if (f->conn.proto_minor < 14 ||
583 !(f->conn.want & FUSE_CAP_SPLICE_WRITE))
584 goto fallback;
585
586 llp = fuse_ll_get_pipe(f);
587 if (llp == NULL)
588 goto fallback;
589
590
591 headerlen = iov_length(iov, iov_count);
592
593 out->len = headerlen + len;
594
595 /*
596 * Heuristic for the required pipe size, does not work if the
597 * source contains less than page size fragments
598 */
599 pipesize = pagesize * (iov_count + buf->count + 1) + out->len;
600
601 if (llp->size < pipesize) {
602 if (llp->can_grow) {
603 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize);
604 if (res == -1) {
605 llp->can_grow = 0;
606 goto fallback;
607 }
608 llp->size = res;
609 }
610 if (llp->size < pipesize)
611 goto fallback;
612 }
613
614
615 res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK);
616 if (res == -1)
617 goto fallback;
618
619 if (res != headerlen) {
620 res = -EIO;
621 fprintf(stderr, "fuse: short vmsplice to pipe: %u/%zu\n", res,
622 headerlen);
623 goto clear_pipe;
624 }
625
626 pipe_buf.buf[0].flags = FUSE_BUF_IS_FD;
627 pipe_buf.buf[0].fd = llp->pipe[1];
628
629 res = fuse_buf_copy(&pipe_buf, buf,
630 FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK);
631 if (res < 0) {
632 if (res == -EAGAIN || res == -EINVAL) {
633 /*
634 * Should only get EAGAIN on kernels with
635 * broken SPLICE_F_NONBLOCK support (<=
636 * 2.6.35) where this error or a short read is
637 * returned even if the pipe itself is not
638 * full
639 *
640 * EINVAL might mean that splice can't handle
641 * this combination of input and output.
642 */
643 if (res == -EAGAIN)
644 f->broken_splice_nonblock = 1;
645
646 pthread_setspecific(f->pipe_key, NULL);
647 fuse_ll_pipe_free(llp);
648 goto fallback;
649 }
650 res = -res;
651 goto clear_pipe;
652 }
653
654 if (res != 0 && res < len) {
655 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
656 void *mbuf;
657 size_t now_len = res;
658 /*
659 * For regular files a short count is either
660 * 1) due to EOF, or
661 * 2) because of broken SPLICE_F_NONBLOCK (see above)
662 *
663 * For other inputs it's possible that we overflowed
664 * the pipe because of small buffer fragments.
665 */
666
667 res = posix_memalign(&mbuf, pagesize, len);
668 if (res != 0)
669 goto clear_pipe;
670
671 mem_buf.buf[0].mem = mbuf;
672 mem_buf.off = now_len;
673 res = fuse_buf_copy(&mem_buf, buf, 0);
674 if (res > 0) {
675 char *tmpbuf;
676 size_t extra_len = res;
677 /*
678 * Trickiest case: got more data. Need to get
679 * back the data from the pipe and then fall
680 * back to regular write.
681 */
682 tmpbuf = malloc(headerlen);
683 if (tmpbuf == NULL) {
684 free(mbuf);
685 res = ENOMEM;
686 goto clear_pipe;
687 }
688 res = read_back(llp->pipe[0], tmpbuf, headerlen);
689 if (res != 0) {
690 free(mbuf);
691 goto clear_pipe;
692 }
693 free(tmpbuf);
694 res = read_back(llp->pipe[0], mbuf, now_len);
695 if (res != 0) {
696 free(mbuf);
697 goto clear_pipe;
698 }
699 len = now_len + extra_len;
700 iov[iov_count].iov_base = mbuf;
701 iov[iov_count].iov_len = len;
702 iov_count++;
703 res = fuse_send_msg(f, ch, iov, iov_count);
704 free(mbuf);
705 return res;
706 }
707 free(mbuf);
708 res = now_len;
709 }
710 len = res;
711 out->len = headerlen + len;
712
713 if (f->debug) {
714 fprintf(stderr,
715 " unique: %llu, success, outsize: %i (splice)\n",
716 (unsigned long long) out->unique, out->len);
717 }
718
719 splice_flags = 0;
720 if ((flags & FUSE_BUF_SPLICE_MOVE) &&
721 (f->conn.want & FUSE_CAP_SPLICE_MOVE))
722 splice_flags |= SPLICE_F_MOVE;
723
724 res = splice(llp->pipe[0], NULL,
725 fuse_chan_fd(ch), NULL, out->len, splice_flags);
726 if (res == -1) {
727 res = -errno;
728 perror("fuse: splice from pipe");
729 goto clear_pipe;
730 }
731 if (res != out->len) {
732 res = -EIO;
733 fprintf(stderr, "fuse: short splice from pipe: %u/%u\n",
734 res, out->len);
735 goto clear_pipe;
736 }
737 return 0;
738
739 clear_pipe:
740 fuse_ll_clear_pipe(f);
741 return res;
742
743 fallback:
744 return fuse_send_data_iov_fallback(f, ch, iov, iov_count, buf, len);
745 }
746 #else
747 static int fuse_send_data_iov(struct fuse_ll *f, struct fuse_chan *ch,
748 struct iovec *iov, int iov_count,
749 struct fuse_bufvec *buf, unsigned int flags)
750 {
751 size_t len = fuse_buf_size(buf);
752 (void) flags;
753
754 return fuse_send_data_iov_fallback(f, ch, iov, iov_count, buf, len);
755 }
756 #endif
757
758 int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv,
759 enum fuse_buf_copy_flags flags)
760 {
761 struct iovec iov[2];
762 struct fuse_out_header out;
763 int res;
764
765 iov[0].iov_base = &out;
766 iov[0].iov_len = sizeof(struct fuse_out_header);
767
768 out.unique = req->unique;
769 out.error = 0;
770
771 res = fuse_send_data_iov(req->f, req->ch, iov, 1, bufv, flags);
772 if (res <= 0) {
773 fuse_free_req(req);
774 return res;
775 } else {
776 return fuse_reply_err(req, res);
777 }
778 }
779
780 int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
781 {
782 struct fuse_statfs_out arg;
783 size_t size = req->f->conn.proto_minor < 4 ?
784 FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
785
786 memset(&arg, 0, sizeof(arg));
787 convert_statfs(stbuf, &arg.st);
788
789 return send_reply_ok(req, &arg, size);
790 }
791
792 int fuse_reply_xattr(fuse_req_t req, size_t count)
793 {
794 struct fuse_getxattr_out arg;
795
796 memset(&arg, 0, sizeof(arg));
797 arg.size = count;
798
799 return send_reply_ok(req, &arg, sizeof(arg));
800 }
801
802 int fuse_reply_lock(fuse_req_t req, const struct flock *lock)
803 {
804 struct fuse_lk_out arg;
805
806 memset(&arg, 0, sizeof(arg));
807 arg.lk.type = lock->l_type;
808 if (lock->l_type != F_UNLCK) {
809 arg.lk.start = lock->l_start;
810 if (lock->l_len == 0)
811 arg.lk.end = OFFSET_MAX;
812 else
813 arg.lk.end = lock->l_start + lock->l_len - 1;
814 }
815 arg.lk.pid = lock->l_pid;
816 return send_reply_ok(req, &arg, sizeof(arg));
817 }
818
819 int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
820 {
821 struct fuse_bmap_out arg;
822
823 memset(&arg, 0, sizeof(arg));
824 arg.block = idx;
825
826 return send_reply_ok(req, &arg, sizeof(arg));
827 }
828
829 static struct fuse_ioctl_iovec *fuse_ioctl_iovec_copy(const struct iovec *iov,
830 size_t count)
831 {
832 struct fuse_ioctl_iovec *fiov;
833 size_t i;
834
835 fiov = malloc(sizeof(fiov[0]) * count);
836 if (!fiov)
837 return NULL;
838
839 for (i = 0; i < count; i++) {
840 fiov[i].base = (uintptr_t) iov[i].iov_base;
841 fiov[i].len = iov[i].iov_len;
842 }
843
844 return fiov;
845 }
846
847 int fuse_reply_ioctl_retry(fuse_req_t req,
848 const struct iovec *in_iov, size_t in_count,
849 const struct iovec *out_iov, size_t out_count)
850 {
851 struct fuse_ioctl_out arg;
852 struct fuse_ioctl_iovec *in_fiov = NULL;
853 struct fuse_ioctl_iovec *out_fiov = NULL;
854 struct iovec iov[4];
855 size_t count = 1;
856 int res;
857
858 memset(&arg, 0, sizeof(arg));
859 arg.flags |= FUSE_IOCTL_RETRY;
860 arg.in_iovs = in_count;
861 arg.out_iovs = out_count;
862 iov[count].iov_base = &arg;
863 iov[count].iov_len = sizeof(arg);
864 count++;
865
866 if (req->f->conn.proto_minor < 16) {
867 if (in_count) {
868 iov[count].iov_base = (void *)in_iov;
869 iov[count].iov_len = sizeof(in_iov[0]) * in_count;
870 count++;
871 }
872
873 if (out_count) {
874 iov[count].iov_base = (void *)out_iov;
875 iov[count].iov_len = sizeof(out_iov[0]) * out_count;
876 count++;
877 }
878 } else {
879 /* Can't handle non-compat 64bit ioctls on 32bit */
880 if (sizeof(void *) == 4 && req->ioctl_64bit) {
881 res = fuse_reply_err(req, EINVAL);
882 goto out;
883 }
884
885 if (in_count) {
886 in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
887 if (!in_fiov)
888 goto enomem;
889
890 iov[count].iov_base = (void *)in_fiov;
891 iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
892 count++;
893 }
894 if (out_count) {
895 out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
896 if (!out_fiov)
897 goto enomem;
898
899 iov[count].iov_base = (void *)out_fiov;
900 iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
901 count++;
902 }
903 }
904
905 res = send_reply_iov(req, 0, iov, count);
906 out:
907 free(in_fiov);
908 free(out_fiov);
909
910 return res;
911
912 enomem:
913 res = fuse_reply_err(req, ENOMEM);
914 goto out;
915 }
916
917 int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
918 {
919 struct fuse_ioctl_out arg;
920 struct iovec iov[3];
921 size_t count = 1;
922
923 memset(&arg, 0, sizeof(arg));
924 arg.result = result;
925 iov[count].iov_base = &arg;
926 iov[count].iov_len = sizeof(arg);
927 count++;
928
929 if (size) {
930 iov[count].iov_base = (char *) buf;
931 iov[count].iov_len = size;
932 count++;
933 }
934
935 return send_reply_iov(req, 0, iov, count);
936 }
937
938 int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
939 int count)
940 {
941 struct iovec *padded_iov;
942 struct fuse_ioctl_out arg;
943 int res;
944
945 padded_iov = malloc((count + 2) * sizeof(struct iovec));
946 if (padded_iov == NULL)
947 return fuse_reply_err(req, ENOMEM);
948
949 memset(&arg, 0, sizeof(arg));
950 arg.result = result;
951 padded_iov[1].iov_base = &arg;
952 padded_iov[1].iov_len = sizeof(arg);
953
954 memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
955
956 res = send_reply_iov(req, 0, padded_iov, count + 2);
957 free(padded_iov);
958
959 return res;
960 }
961
962 int fuse_reply_poll(fuse_req_t req, unsigned revents)
963 {
964 struct fuse_poll_out arg;
965
966 memset(&arg, 0, sizeof(arg));
967 arg.revents = revents;
968
969 return send_reply_ok(req, &arg, sizeof(arg));
970 }
971
972 static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
973 {
974 char *name = (char *) inarg;
975
976 if (req->f->op.lookup)
977 req->f->op.lookup(req, nodeid, name);
978 else
979 fuse_reply_err(req, ENOSYS);
980 }
981
982 static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
983 {
984 struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;
985
986 if (req->f->op.forget)
987 req->f->op.forget(req, nodeid, arg->nlookup);
988 else
989 fuse_reply_none(req);
990 }
991
992 static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid,
993 const void *inarg)
994 {
995 struct fuse_batch_forget_in *arg = (void *) inarg;
996 struct fuse_forget_one *param = (void *) PARAM(arg);
997 unsigned int i;
998
999 (void) nodeid;
1000
1001 if (req->f->op.forget_multi) {
1002 req->f->op.forget_multi(req, arg->count,
1003 (struct fuse_forget_data *) param);
1004 } else if (req->f->op.forget) {
1005 for (i = 0; i < arg->count; i++) {
1006 struct fuse_forget_one *forget = &param[i];
1007 struct fuse_req *dummy_req;
1008
1009 dummy_req = fuse_ll_alloc_req(req->f);
1010 if (dummy_req == NULL)
1011 break;
1012
1013 dummy_req->unique = req->unique;
1014 dummy_req->ctx = req->ctx;
1015 dummy_req->ch = NULL;
1016
1017 req->f->op.forget(dummy_req, forget->nodeid,
1018 forget->nlookup);
1019 }
1020 fuse_reply_none(req);
1021 } else {
1022 fuse_reply_none(req);
1023 }
1024 }
1025
1026 static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1027 {
1028 struct fuse_file_info *fip = NULL;
1029 struct fuse_file_info fi;
1030
1031 if (req->f->conn.proto_minor >= 9) {
1032 struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;
1033
1034 if (arg->getattr_flags & FUSE_GETATTR_FH) {
1035 memset(&fi, 0, sizeof(fi));
1036 fi.fh = arg->fh;
1037 fi.fh_old = fi.fh;
1038 fip = &fi;
1039 }
1040 }
1041
1042 if (req->f->op.getattr)
1043 req->f->op.getattr(req, nodeid, fip);
1044 else
1045 fuse_reply_err(req, ENOSYS);
1046 }
1047
1048 static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1049 {
1050 struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;
1051
1052 if (req->f->op.setattr) {
1053 struct fuse_file_info *fi = NULL;
1054 struct fuse_file_info fi_store;
1055 struct stat stbuf;
1056 memset(&stbuf, 0, sizeof(stbuf));
1057 convert_attr(arg, &stbuf);
1058 if (arg->valid & FATTR_FH) {
1059 arg->valid &= ~FATTR_FH;
1060 memset(&fi_store, 0, sizeof(fi_store));
1061 fi = &fi_store;
1062 fi->fh = arg->fh;
1063 fi->fh_old = fi->fh;
1064 }
1065 arg->valid &=
1066 FUSE_SET_ATTR_MODE |
1067 FUSE_SET_ATTR_UID |
1068 FUSE_SET_ATTR_GID |
1069 FUSE_SET_ATTR_SIZE |
1070 FUSE_SET_ATTR_ATIME |
1071 FUSE_SET_ATTR_MTIME |
1072 FUSE_SET_ATTR_ATIME_NOW |
1073 FUSE_SET_ATTR_MTIME_NOW;
1074
1075 req->f->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
1076 } else
1077 fuse_reply_err(req, ENOSYS);
1078 }
1079
1080 static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1081 {
1082 struct fuse_access_in *arg = (struct fuse_access_in *) inarg;
1083
1084 if (req->f->op.access)
1085 req->f->op.access(req, nodeid, arg->mask);
1086 else
1087 fuse_reply_err(req, ENOSYS);
1088 }
1089
1090 static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1091 {
1092 (void) inarg;
1093
1094 if (req->f->op.readlink)
1095 req->f->op.readlink(req, nodeid);
1096 else
1097 fuse_reply_err(req, ENOSYS);
1098 }
1099
1100 static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1101 {
1102 struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
1103 char *name = PARAM(arg);
1104
1105 if (req->f->conn.proto_minor >= 12)
1106 req->ctx.umask = arg->umask;
1107 else
1108 name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
1109
1110 if (req->f->op.mknod)
1111 req->f->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
1112 else
1113 fuse_reply_err(req, ENOSYS);
1114 }
1115
1116 static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1117 {
1118 struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;
1119
1120 if (req->f->conn.proto_minor >= 12)
1121 req->ctx.umask = arg->umask;
1122
1123 if (req->f->op.mkdir)
1124 req->f->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
1125 else
1126 fuse_reply_err(req, ENOSYS);
1127 }
1128
1129 static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1130 {
1131 char *name = (char *) inarg;
1132
1133 if (req->f->op.unlink)
1134 req->f->op.unlink(req, nodeid, name);
1135 else
1136 fuse_reply_err(req, ENOSYS);
1137 }
1138
1139 static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1140 {
1141 char *name = (char *) inarg;
1142
1143 if (req->f->op.rmdir)
1144 req->f->op.rmdir(req, nodeid, name);
1145 else
1146 fuse_reply_err(req, ENOSYS);
1147 }
1148
1149 static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1150 {
1151 char *name = (char *) inarg;
1152 char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;
1153
1154 if (req->f->op.symlink)
1155 req->f->op.symlink(req, linkname, nodeid, name);
1156 else
1157 fuse_reply_err(req, ENOSYS);
1158 }
1159
1160 static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1161 {
1162 struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
1163 char *oldname = PARAM(arg);
1164 char *newname = oldname + strlen(oldname) + 1;
1165
1166 if (req->f->op.rename)
1167 req->f->op.rename(req, nodeid, oldname, arg->newdir, newname);
1168 else
1169 fuse_reply_err(req, ENOSYS);
1170 }
1171
1172 static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1173 {
1174 struct fuse_link_in *arg = (struct fuse_link_in *) inarg;
1175
1176 if (req->f->op.link)
1177 req->f->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
1178 else
1179 fuse_reply_err(req, ENOSYS);
1180 }
1181
1182 static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1183 {
1184 struct fuse_create_in *arg = (struct fuse_create_in *) inarg;
1185
1186 if (req->f->op.create) {
1187 struct fuse_file_info fi;
1188 char *name = PARAM(arg);
1189
1190 memset(&fi, 0, sizeof(fi));
1191 fi.flags = arg->flags;
1192
1193 if (req->f->conn.proto_minor >= 12)
1194 req->ctx.umask = arg->umask;
1195 else
1196 name = (char *) inarg + sizeof(struct fuse_open_in);
1197
1198 req->f->op.create(req, nodeid, name, arg->mode, &fi);
1199 } else
1200 fuse_reply_err(req, ENOSYS);
1201 }
1202
1203 static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1204 {
1205 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1206 struct fuse_file_info fi;
1207
1208 memset(&fi, 0, sizeof(fi));
1209 fi.flags = arg->flags;
1210
1211 if (req->f->op.open)
1212 req->f->op.open(req, nodeid, &fi);
1213 else
1214 fuse_reply_open(req, &fi);
1215 }
1216
1217 static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1218 {
1219 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1220
1221 if (req->f->op.read) {
1222 struct fuse_file_info fi;
1223
1224 memset(&fi, 0, sizeof(fi));
1225 fi.fh = arg->fh;
1226 fi.fh_old = fi.fh;
1227 if (req->f->conn.proto_minor >= 9) {
1228 fi.lock_owner = arg->lock_owner;
1229 fi.flags = arg->flags;
1230 }
1231 req->f->op.read(req, nodeid, arg->size, arg->offset, &fi);
1232 } else
1233 fuse_reply_err(req, ENOSYS);
1234 }
1235
1236 static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1237 {
1238 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1239 struct fuse_file_info fi;
1240 char *param;
1241
1242 memset(&fi, 0, sizeof(fi));
1243 fi.fh = arg->fh;
1244 fi.fh_old = fi.fh;
1245 fi.writepage = arg->write_flags & 1;
1246
1247 if (req->f->conn.proto_minor < 9) {
1248 param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1249 } else {
1250 fi.lock_owner = arg->lock_owner;
1251 fi.flags = arg->flags;
1252 param = PARAM(arg);
1253 }
1254
1255 if (req->f->op.write)
1256 req->f->op.write(req, nodeid, param, arg->size,
1257 arg->offset, &fi);
1258 else
1259 fuse_reply_err(req, ENOSYS);
1260 }
1261
1262 static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
1263 const struct fuse_buf *ibuf)
1264 {
1265 struct fuse_ll *f = req->f;
1266 struct fuse_bufvec bufv = {
1267 .buf[0] = *ibuf,
1268 .count = 1,
1269 };
1270 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1271 struct fuse_file_info fi;
1272
1273 memset(&fi, 0, sizeof(fi));
1274 fi.fh = arg->fh;
1275 fi.fh_old = fi.fh;
1276 fi.writepage = arg->write_flags & 1;
1277
1278 if (req->f->conn.proto_minor < 9) {
1279 bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1280 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1281 FUSE_COMPAT_WRITE_IN_SIZE;
1282 assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD));
1283 } else {
1284 fi.lock_owner = arg->lock_owner;
1285 fi.flags = arg->flags;
1286 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
1287 bufv.buf[0].mem = PARAM(arg);
1288
1289 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1290 sizeof(struct fuse_write_in);
1291 }
1292 if (bufv.buf[0].size < arg->size) {
1293 fprintf(stderr, "fuse: do_write_buf: buffer size too small\n");
1294 fuse_reply_err(req, EIO);
1295 goto out;
1296 }
1297 bufv.buf[0].size = arg->size;
1298
1299 req->f->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
1300
1301 out:
1302 /* Need to reset the pipe if ->write_buf() didn't consume all data */
1303 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
1304 fuse_ll_clear_pipe(f);
1305 }
1306
1307 static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1308 {
1309 struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
1310 struct fuse_file_info fi;
1311
1312 memset(&fi, 0, sizeof(fi));
1313 fi.fh = arg->fh;
1314 fi.fh_old = fi.fh;
1315 fi.flush = 1;
1316 if (req->f->conn.proto_minor >= 7)
1317 fi.lock_owner = arg->lock_owner;
1318
1319 if (req->f->op.flush)
1320 req->f->op.flush(req, nodeid, &fi);
1321 else
1322 fuse_reply_err(req, ENOSYS);
1323 }
1324
1325 static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1326 {
1327 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1328 struct fuse_file_info fi;
1329
1330 memset(&fi, 0, sizeof(fi));
1331 fi.flags = arg->flags;
1332 fi.fh = arg->fh;
1333 fi.fh_old = fi.fh;
1334 if (req->f->conn.proto_minor >= 8) {
1335 fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
1336 fi.lock_owner = arg->lock_owner;
1337 }
1338 if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) {
1339 fi.flock_release = 1;
1340 fi.lock_owner = arg->lock_owner;
1341 }
1342
1343 if (req->f->op.release)
1344 req->f->op.release(req, nodeid, &fi);
1345 else
1346 fuse_reply_err(req, 0);
1347 }
1348
1349 static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1350 {
1351 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1352 struct fuse_file_info fi;
1353
1354 memset(&fi, 0, sizeof(fi));
1355 fi.fh = arg->fh;
1356 fi.fh_old = fi.fh;
1357
1358 if (req->f->op.fsync)
1359 req->f->op.fsync(req, nodeid, arg->fsync_flags & 1, &fi);
1360 else
1361 fuse_reply_err(req, ENOSYS);
1362 }
1363
1364 static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1365 {
1366 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1367 struct fuse_file_info fi;
1368
1369 memset(&fi, 0, sizeof(fi));
1370 fi.flags = arg->flags;
1371
1372 if (req->f->op.opendir)
1373 req->f->op.opendir(req, nodeid, &fi);
1374 else
1375 fuse_reply_open(req, &fi);
1376 }
1377
1378 static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1379 {
1380 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1381 struct fuse_file_info fi;
1382
1383 memset(&fi, 0, sizeof(fi));
1384 fi.fh = arg->fh;
1385 fi.fh_old = fi.fh;
1386
1387 if (req->f->op.readdir)
1388 req->f->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
1389 else
1390 fuse_reply_err(req, ENOSYS);
1391 }
1392
1393 static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1394 {
1395 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1396 struct fuse_file_info fi;
1397
1398 memset(&fi, 0, sizeof(fi));
1399 fi.flags = arg->flags;
1400 fi.fh = arg->fh;
1401 fi.fh_old = fi.fh;
1402
1403 if (req->f->op.releasedir)
1404 req->f->op.releasedir(req, nodeid, &fi);
1405 else
1406 fuse_reply_err(req, 0);
1407 }
1408
1409 static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1410 {
1411 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1412 struct fuse_file_info fi;
1413
1414 memset(&fi, 0, sizeof(fi));
1415 fi.fh = arg->fh;
1416 fi.fh_old = fi.fh;
1417
1418 if (req->f->op.fsyncdir)
1419 req->f->op.fsyncdir(req, nodeid, arg->fsync_flags & 1, &fi);
1420 else
1421 fuse_reply_err(req, ENOSYS);
1422 }
1423
1424 static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1425 {
1426 (void) nodeid;
1427 (void) inarg;
1428
1429 if (req->f->op.statfs)
1430 req->f->op.statfs(req, nodeid);
1431 else {
1432 struct statvfs buf = {
1433 .f_namemax = 255,
1434 .f_bsize = 512,
1435 };
1436 fuse_reply_statfs(req, &buf);
1437 }
1438 }
1439
1440 static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1441 {
1442 struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
1443 char *name = PARAM(arg);
1444 char *value = name + strlen(name) + 1;
1445
1446 if (req->f->op.setxattr)
1447 req->f->op.setxattr(req, nodeid, name, value, arg->size,
1448 arg->flags);
1449 else
1450 fuse_reply_err(req, ENOSYS);
1451 }
1452
1453 static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1454 {
1455 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1456
1457 if (req->f->op.getxattr)
1458 req->f->op.getxattr(req, nodeid, PARAM(arg), arg->size);
1459 else
1460 fuse_reply_err(req, ENOSYS);
1461 }
1462
1463 static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1464 {
1465 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1466
1467 if (req->f->op.listxattr)
1468 req->f->op.listxattr(req, nodeid, arg->size);
1469 else
1470 fuse_reply_err(req, ENOSYS);
1471 }
1472
1473 static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1474 {
1475 char *name = (char *) inarg;
1476
1477 if (req->f->op.removexattr)
1478 req->f->op.removexattr(req, nodeid, name);
1479 else
1480 fuse_reply_err(req, ENOSYS);
1481 }
1482
1483 static void convert_fuse_file_lock(struct fuse_file_lock *fl,
1484 struct flock *flock)
1485 {
1486 memset(flock, 0, sizeof(struct flock));
1487 flock->l_type = fl->type;
1488 flock->l_whence = SEEK_SET;
1489 flock->l_start = fl->start;
1490 if (fl->end == OFFSET_MAX)
1491 flock->l_len = 0;
1492 else
1493 flock->l_len = fl->end - fl->start + 1;
1494 flock->l_pid = fl->pid;
1495 }
1496
1497 static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1498 {
1499 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1500 struct fuse_file_info fi;
1501 struct flock flock;
1502
1503 memset(&fi, 0, sizeof(fi));
1504 fi.fh = arg->fh;
1505 fi.lock_owner = arg->owner;
1506
1507 convert_fuse_file_lock(&arg->lk, &flock);
1508 if (req->f->op.getlk)
1509 req->f->op.getlk(req, nodeid, &fi, &flock);
1510 else
1511 fuse_reply_err(req, ENOSYS);
1512 }
1513
1514 static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
1515 const void *inarg, int sleep)
1516 {
1517 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1518 struct fuse_file_info fi;
1519 struct flock flock;
1520
1521 memset(&fi, 0, sizeof(fi));
1522 fi.fh = arg->fh;
1523 fi.lock_owner = arg->owner;
1524
1525 if (arg->lk_flags & FUSE_LK_FLOCK) {
1526 int op = 0;
1527
1528 switch (arg->lk.type) {
1529 case F_RDLCK:
1530 op = LOCK_SH;
1531 break;
1532 case F_WRLCK:
1533 op = LOCK_EX;
1534 break;
1535 case F_UNLCK:
1536 op = LOCK_UN;
1537 break;
1538 }
1539 if (!sleep)
1540 op |= LOCK_NB;
1541
1542 if (req->f->op.flock)
1543 req->f->op.flock(req, nodeid, &fi, op);
1544 else
1545 fuse_reply_err(req, ENOSYS);
1546 } else {
1547 convert_fuse_file_lock(&arg->lk, &flock);
1548 if (req->f->op.setlk)
1549 req->f->op.setlk(req, nodeid, &fi, &flock, sleep);
1550 else
1551 fuse_reply_err(req, ENOSYS);
1552 }
1553 }
1554
1555 static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1556 {
1557 do_setlk_common(req, nodeid, inarg, 0);
1558 }
1559
1560 static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1561 {
1562 do_setlk_common(req, nodeid, inarg, 1);
1563 }
1564
1565 static int find_interrupted(struct fuse_ll *f, struct fuse_req *req)
1566 {
1567 struct fuse_req *curr;
1568
1569 for (curr = f->list.next; curr != &f->list; curr = curr->next) {
1570 if (curr->unique == req->u.i.unique) {
1571 fuse_interrupt_func_t func;
1572 void *data;
1573
1574 curr->ctr++;
1575 pthread_mutex_unlock(&f->lock);
1576
1577 /* Ugh, ugly locking */
1578 pthread_mutex_lock(&curr->lock);
1579 pthread_mutex_lock(&f->lock);
1580 curr->interrupted = 1;
1581 func = curr->u.ni.func;
1582 data = curr->u.ni.data;
1583 pthread_mutex_unlock(&f->lock);
1584 if (func)
1585 func(curr, data);
1586 pthread_mutex_unlock(&curr->lock);
1587
1588 pthread_mutex_lock(&f->lock);
1589 curr->ctr--;
1590 if (!curr->ctr)
1591 destroy_req(curr);
1592
1593 return 1;
1594 }
1595 }
1596 for (curr = f->interrupts.next; curr != &f->interrupts;
1597 curr = curr->next) {
1598 if (curr->u.i.unique == req->u.i.unique)
1599 return 1;
1600 }
1601 return 0;
1602 }
1603
1604 static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1605 {
1606 struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
1607 struct fuse_ll *f = req->f;
1608
1609 (void) nodeid;
1610 if (f->debug)
1611 fprintf(stderr, "INTERRUPT: %llu\n",
1612 (unsigned long long) arg->unique);
1613
1614 req->u.i.unique = arg->unique;
1615
1616 pthread_mutex_lock(&f->lock);
1617 if (find_interrupted(f, req))
1618 destroy_req(req);
1619 else
1620 list_add_req(req, &f->interrupts);
1621 pthread_mutex_unlock(&f->lock);
1622 }
1623
1624 static struct fuse_req *check_interrupt(struct fuse_ll *f, struct fuse_req *req)
1625 {
1626 struct fuse_req *curr;
1627
1628 for (curr = f->interrupts.next; curr != &f->interrupts;
1629 curr = curr->next) {
1630 if (curr->u.i.unique == req->unique) {
1631 req->interrupted = 1;
1632 list_del_req(curr);
1633 free(curr);
1634 return NULL;
1635 }
1636 }
1637 curr = f->interrupts.next;
1638 if (curr != &f->interrupts) {
1639 list_del_req(curr);
1640 list_init_req(curr);
1641 return curr;
1642 } else
1643 return NULL;
1644 }
1645
1646 static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1647 {
1648 struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;
1649
1650 if (req->f->op.bmap)
1651 req->f->op.bmap(req, nodeid, arg->blocksize, arg->block);
1652 else
1653 fuse_reply_err(req, ENOSYS);
1654 }
1655
1656 static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1657 {
1658 struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
1659 unsigned int flags = arg->flags;
1660 void *in_buf = arg->in_size ? PARAM(arg) : NULL;
1661 struct fuse_file_info fi;
1662
1663 if (flags & FUSE_IOCTL_DIR &&
1664 !(req->f->conn.want & FUSE_CAP_IOCTL_DIR)) {
1665 fuse_reply_err(req, ENOTTY);
1666 return;
1667 }
1668
1669 memset(&fi, 0, sizeof(fi));
1670 fi.fh = arg->fh;
1671 fi.fh_old = fi.fh;
1672
1673 if (sizeof(void *) == 4 && req->f->conn.proto_minor >= 16 &&
1674 !(flags & FUSE_IOCTL_32BIT)) {
1675 req->ioctl_64bit = 1;
1676 }
1677
1678 if (req->f->op.ioctl)
1679 req->f->op.ioctl(req, nodeid, arg->cmd,
1680 (void *)(uintptr_t)arg->arg, &fi, flags,
1681 in_buf, arg->in_size, arg->out_size);
1682 else
1683 fuse_reply_err(req, ENOSYS);
1684 }
1685
1686 void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
1687 {
1688 free(ph);
1689 }
1690
1691 static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1692 {
1693 struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
1694 struct fuse_file_info fi;
1695
1696 memset(&fi, 0, sizeof(fi));
1697 fi.fh = arg->fh;
1698 fi.fh_old = fi.fh;
1699
1700 if (req->f->op.poll) {
1701 struct fuse_pollhandle *ph = NULL;
1702
1703 if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
1704 ph = malloc(sizeof(struct fuse_pollhandle));
1705 if (ph == NULL) {
1706 fuse_reply_err(req, ENOMEM);
1707 return;
1708 }
1709 ph->kh = arg->kh;
1710 ph->ch = req->ch;
1711 ph->f = req->f;
1712 }
1713
1714 req->f->op.poll(req, nodeid, &fi, ph);
1715 } else {
1716 fuse_reply_err(req, ENOSYS);
1717 }
1718 }
1719
1720 static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1721 {
1722 struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
1723 struct fuse_init_out outarg;
1724 struct fuse_ll *f = req->f;
1725 size_t bufsize = fuse_chan_bufsize(req->ch);
1726
1727 (void) nodeid;
1728 if (f->debug) {
1729 fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
1730 if (arg->major == 7 && arg->minor >= 6) {
1731 fprintf(stderr, "flags=0x%08x\n", arg->flags);
1732 fprintf(stderr, "max_readahead=0x%08x\n",
1733 arg->max_readahead);
1734 }
1735 }
1736 f->conn.proto_major = arg->major;
1737 f->conn.proto_minor = arg->minor;
1738 f->conn.capable = 0;
1739 f->conn.want = 0;
1740
1741 memset(&outarg, 0, sizeof(outarg));
1742 outarg.major = FUSE_KERNEL_VERSION;
1743 outarg.minor = FUSE_KERNEL_MINOR_VERSION;
1744
1745 if (arg->major < 7) {
1746 fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
1747 arg->major, arg->minor);
1748 fuse_reply_err(req, EPROTO);
1749 return;
1750 }
1751
1752 if (arg->major > 7) {
1753 /* Wait for a second INIT request with a 7.X version */
1754 send_reply_ok(req, &outarg, sizeof(outarg));
1755 return;
1756 }
1757
1758 if (arg->minor >= 6) {
1759 if (f->conn.async_read)
1760 f->conn.async_read = arg->flags & FUSE_ASYNC_READ;
1761 if (arg->max_readahead < f->conn.max_readahead)
1762 f->conn.max_readahead = arg->max_readahead;
1763 if (arg->flags & FUSE_ASYNC_READ)
1764 f->conn.capable |= FUSE_CAP_ASYNC_READ;
1765 if (arg->flags & FUSE_POSIX_LOCKS)
1766 f->conn.capable |= FUSE_CAP_POSIX_LOCKS;
1767 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
1768 f->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
1769 if (arg->flags & FUSE_EXPORT_SUPPORT)
1770 f->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
1771 if (arg->flags & FUSE_BIG_WRITES)
1772 f->conn.capable |= FUSE_CAP_BIG_WRITES;
1773 if (arg->flags & FUSE_DONT_MASK)
1774 f->conn.capable |= FUSE_CAP_DONT_MASK;
1775 if (arg->flags & FUSE_FLOCK_LOCKS)
1776 f->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
1777 } else {
1778 f->conn.async_read = 0;
1779 f->conn.max_readahead = 0;
1780 }
1781
1782 if (req->f->conn.proto_minor >= 14) {
1783 #ifdef HAVE_SPLICE
1784 #ifdef HAVE_VMSPLICE
1785 f->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
1786 if (f->splice_write)
1787 f->conn.want |= FUSE_CAP_SPLICE_WRITE;
1788 if (f->splice_move)
1789 f->conn.want |= FUSE_CAP_SPLICE_MOVE;
1790 #endif
1791 f->conn.capable |= FUSE_CAP_SPLICE_READ;
1792 if (f->splice_read)
1793 f->conn.want |= FUSE_CAP_SPLICE_READ;
1794 #endif
1795 }
1796 if (req->f->conn.proto_minor >= 18)
1797 f->conn.capable |= FUSE_CAP_IOCTL_DIR;
1798
1799 if (f->atomic_o_trunc)
1800 f->conn.want |= FUSE_CAP_ATOMIC_O_TRUNC;
1801 if (f->op.getlk && f->op.setlk && !f->no_remote_posix_lock)
1802 f->conn.want |= FUSE_CAP_POSIX_LOCKS;
1803 if (f->op.flock && !f->no_remote_flock)
1804 f->conn.want |= FUSE_CAP_FLOCK_LOCKS;
1805 if (f->big_writes)
1806 f->conn.want |= FUSE_CAP_BIG_WRITES;
1807
1808 if (bufsize < FUSE_MIN_READ_BUFFER) {
1809 fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
1810 bufsize);
1811 bufsize = FUSE_MIN_READ_BUFFER;
1812 }
1813
1814 bufsize -= 4096;
1815 if (bufsize < f->conn.max_write)
1816 f->conn.max_write = bufsize;
1817
1818 f->got_init = 1;
1819 if (f->op.init)
1820 f->op.init(f->userdata, &f->conn);
1821
1822 if (f->no_splice_read)
1823 f->conn.want &= ~FUSE_CAP_SPLICE_READ;
1824 if (f->no_splice_write)
1825 f->conn.want &= ~FUSE_CAP_SPLICE_WRITE;
1826 if (f->no_splice_move)
1827 f->conn.want &= ~FUSE_CAP_SPLICE_MOVE;
1828
1829 if (f->conn.async_read || (f->conn.want & FUSE_CAP_ASYNC_READ))
1830 outarg.flags |= FUSE_ASYNC_READ;
1831 if (f->conn.want & FUSE_CAP_POSIX_LOCKS)
1832 outarg.flags |= FUSE_POSIX_LOCKS;
1833 if (f->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
1834 outarg.flags |= FUSE_ATOMIC_O_TRUNC;
1835 if (f->conn.want & FUSE_CAP_EXPORT_SUPPORT)
1836 outarg.flags |= FUSE_EXPORT_SUPPORT;
1837 if (f->conn.want & FUSE_CAP_BIG_WRITES)
1838 outarg.flags |= FUSE_BIG_WRITES;
1839 if (f->conn.want & FUSE_CAP_DONT_MASK)
1840 outarg.flags |= FUSE_DONT_MASK;
1841 if (f->conn.want & FUSE_CAP_FLOCK_LOCKS)
1842 outarg.flags |= FUSE_FLOCK_LOCKS;
1843 outarg.max_readahead = f->conn.max_readahead;
1844 outarg.max_write = f->conn.max_write;
1845 if (f->conn.proto_minor >= 13) {
1846 if (f->conn.max_background >= (1 << 16))
1847 f->conn.max_background = (1 << 16) - 1;
1848 if (f->conn.congestion_threshold > f->conn.max_background)
1849 f->conn.congestion_threshold = f->conn.max_background;
1850 if (!f->conn.congestion_threshold) {
1851 f->conn.congestion_threshold =
1852 f->conn.max_background * 3 / 4;
1853 }
1854
1855 outarg.max_background = f->conn.max_background;
1856 outarg.congestion_threshold = f->conn.congestion_threshold;
1857 }
1858
1859 if (f->debug) {
1860 fprintf(stderr, " INIT: %u.%u\n", outarg.major, outarg.minor);
1861 fprintf(stderr, " flags=0x%08x\n", outarg.flags);
1862 fprintf(stderr, " max_readahead=0x%08x\n",
1863 outarg.max_readahead);
1864 fprintf(stderr, " max_write=0x%08x\n", outarg.max_write);
1865 fprintf(stderr, " max_background=%i\n",
1866 outarg.max_background);
1867 fprintf(stderr, " congestion_threshold=%i\n",
1868 outarg.congestion_threshold);
1869 }
1870
1871 send_reply_ok(req, &outarg, arg->minor < 5 ? 8 : sizeof(outarg));
1872 }
1873
1874 static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1875 {
1876 struct fuse_ll *f = req->f;
1877
1878 (void) nodeid;
1879 (void) inarg;
1880
1881 f->got_destroy = 1;
1882 if (f->op.destroy)
1883 f->op.destroy(f->userdata);
1884
1885 send_reply_ok(req, NULL, 0);
1886 }
1887
1888 static void list_del_nreq(struct fuse_notify_req *nreq)
1889 {
1890 struct fuse_notify_req *prev = nreq->prev;
1891 struct fuse_notify_req *next = nreq->next;
1892 prev->next = next;
1893 next->prev = prev;
1894 }
1895
1896 static void list_add_nreq(struct fuse_notify_req *nreq,
1897 struct fuse_notify_req *next)
1898 {
1899 struct fuse_notify_req *prev = next->prev;
1900 nreq->next = next;
1901 nreq->prev = prev;
1902 prev->next = nreq;
1903 next->prev = nreq;
1904 }
1905
1906 static void list_init_nreq(struct fuse_notify_req *nreq)
1907 {
1908 nreq->next = nreq;
1909 nreq->prev = nreq;
1910 }
1911
1912 static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
1913 const void *inarg, const struct fuse_buf *buf)
1914 {
1915 struct fuse_ll *f = req->f;
1916 struct fuse_notify_req *nreq;
1917 struct fuse_notify_req *head;
1918
1919 pthread_mutex_lock(&f->lock);
1920 head = &f->notify_list;
1921 for (nreq = head->next; nreq != head; nreq = nreq->next) {
1922 if (nreq->unique == req->unique) {
1923 list_del_nreq(nreq);
1924 break;
1925 }
1926 }
1927 pthread_mutex_unlock(&f->lock);
1928
1929 if (nreq != head)
1930 nreq->reply(nreq, req, nodeid, inarg, buf);
1931 }
1932
1933 static int send_notify_iov(struct fuse_ll *f, struct fuse_chan *ch,
1934 int notify_code, struct iovec *iov, int count)
1935 {
1936 struct fuse_out_header out;
1937
1938 if (!f->got_init)
1939 return -ENOTCONN;
1940
1941 out.unique = 0;
1942 out.error = notify_code;
1943 iov[0].iov_base = &out;
1944 iov[0].iov_len = sizeof(struct fuse_out_header);
1945
1946 return fuse_send_msg(f, ch, iov, count);
1947 }
1948
1949 int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
1950 {
1951 if (ph != NULL) {
1952 struct fuse_notify_poll_wakeup_out outarg;
1953 struct iovec iov[2];
1954
1955 outarg.kh = ph->kh;
1956
1957 iov[1].iov_base = &outarg;
1958 iov[1].iov_len = sizeof(outarg);
1959
1960 return send_notify_iov(ph->f, ph->ch, FUSE_NOTIFY_POLL, iov, 2);
1961 } else {
1962 return 0;
1963 }
1964 }
1965
1966 int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, fuse_ino_t ino,
1967 off_t off, off_t len)
1968 {
1969 struct fuse_notify_inval_inode_out outarg;
1970 struct fuse_ll *f;
1971 struct iovec iov[2];
1972
1973 if (!ch)
1974 return -EINVAL;
1975
1976 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
1977 if (!f)
1978 return -ENODEV;
1979
1980 outarg.ino = ino;
1981 outarg.off = off;
1982 outarg.len = len;
1983
1984 iov[1].iov_base = &outarg;
1985 iov[1].iov_len = sizeof(outarg);
1986
1987 return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2);
1988 }
1989
1990 int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, fuse_ino_t parent,
1991 const char *name, size_t namelen)
1992 {
1993 struct fuse_notify_inval_entry_out outarg;
1994 struct fuse_ll *f;
1995 struct iovec iov[3];
1996
1997 if (!ch)
1998 return -EINVAL;
1999
2000 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2001 if (!f)
2002 return -ENODEV;
2003
2004 outarg.parent = parent;
2005 outarg.namelen = namelen;
2006 outarg.padding = 0;
2007
2008 iov[1].iov_base = &outarg;
2009 iov[1].iov_len = sizeof(outarg);
2010 iov[2].iov_base = (void *)name;
2011 iov[2].iov_len = namelen + 1;
2012
2013 return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
2014 }
2015
2016 int fuse_lowlevel_notify_delete(struct fuse_chan *ch,
2017 fuse_ino_t parent, fuse_ino_t child,
2018 const char *name, size_t namelen)
2019 {
2020 struct fuse_notify_delete_out outarg;
2021 struct fuse_ll *f;
2022 struct iovec iov[3];
2023
2024 if (!ch)
2025 return -EINVAL;
2026
2027 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2028 if (!f)
2029 return -ENODEV;
2030
2031 outarg.parent = parent;
2032 outarg.child = child;
2033 outarg.namelen = namelen;
2034 outarg.padding = 0;
2035
2036 iov[1].iov_base = &outarg;
2037 iov[1].iov_len = sizeof(outarg);
2038 iov[2].iov_base = (void *)name;
2039 iov[2].iov_len = namelen + 1;
2040
2041 return send_notify_iov(f, ch, FUSE_NOTIFY_DELETE, iov, 3);
2042 }
2043
2044 int fuse_lowlevel_notify_store(struct fuse_chan *ch, fuse_ino_t ino,
2045 off_t offset, struct fuse_bufvec *bufv,
2046 enum fuse_buf_copy_flags flags)
2047 {
2048 struct fuse_out_header out;
2049 struct fuse_notify_store_out outarg;
2050 struct fuse_ll *f;
2051 struct iovec iov[3];
2052 size_t size = fuse_buf_size(bufv);
2053 int res;
2054
2055 if (!ch)
2056 return -EINVAL;
2057
2058 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2059 if (!f)
2060 return -ENODEV;
2061
2062 out.unique = 0;
2063 out.error = FUSE_NOTIFY_STORE;
2064
2065 outarg.nodeid = ino;
2066 outarg.offset = offset;
2067 outarg.size = size;
2068
2069 iov[0].iov_base = &out;
2070 iov[0].iov_len = sizeof(out);
2071 iov[1].iov_base = &outarg;
2072 iov[1].iov_len = sizeof(outarg);
2073
2074 res = fuse_send_data_iov(f, ch, iov, 2, bufv, flags);
2075 if (res > 0)
2076 res = -res;
2077
2078 return res;
2079 }
2080
2081 struct fuse_retrieve_req {
2082 struct fuse_notify_req nreq;
2083 void *cookie;
2084 };
2085
2086 static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
2087 fuse_req_t req, fuse_ino_t ino,
2088 const void *inarg,
2089 const struct fuse_buf *ibuf)
2090 {
2091 struct fuse_ll *f = req->f;
2092 struct fuse_retrieve_req *rreq =
2093 container_of(nreq, struct fuse_retrieve_req, nreq);
2094 const struct fuse_notify_retrieve_in *arg = inarg;
2095 struct fuse_bufvec bufv = {
2096 .buf[0] = *ibuf,
2097 .count = 1,
2098 };
2099
2100 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
2101 bufv.buf[0].mem = PARAM(arg);
2102
2103 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
2104 sizeof(struct fuse_notify_retrieve_in);
2105
2106 if (bufv.buf[0].size < arg->size) {
2107 fprintf(stderr, "fuse: retrieve reply: buffer size too small\n");
2108 fuse_reply_none(req);
2109 goto out;
2110 }
2111 bufv.buf[0].size = arg->size;
2112
2113 if (req->f->op.retrieve_reply) {
2114 req->f->op.retrieve_reply(req, rreq->cookie, ino,
2115 arg->offset, &bufv);
2116 } else {
2117 fuse_reply_none(req);
2118 }
2119 out:
2120 free(rreq);
2121 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
2122 fuse_ll_clear_pipe(f);
2123 }
2124
2125 int fuse_lowlevel_notify_retrieve(struct fuse_chan *ch, fuse_ino_t ino,
2126 size_t size, off_t offset, void *cookie)
2127 {
2128 struct fuse_notify_retrieve_out outarg;
2129 struct fuse_ll *f;
2130 struct iovec iov[2];
2131 struct fuse_retrieve_req *rreq;
2132 int err;
2133
2134 if (!ch)
2135 return -EINVAL;
2136
2137 f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
2138 if (!f)
2139 return -ENODEV;
2140
2141 rreq = malloc(sizeof(*rreq));
2142 if (rreq == NULL)
2143 return -ENOMEM;
2144
2145 pthread_mutex_lock(&f->lock);
2146 rreq->cookie = cookie;
2147 rreq->nreq.unique = f->notify_ctr++;
2148 rreq->nreq.reply = fuse_ll_retrieve_reply;
2149 list_add_nreq(&rreq->nreq, &f->notify_list);
2150 pthread_mutex_unlock(&f->lock);
2151
2152 outarg.notify_unique = rreq->nreq.unique;
2153 outarg.nodeid = ino;
2154 outarg.offset = offset;
2155 outarg.size = size;
2156
2157 iov[1].iov_base = &outarg;
2158 iov[1].iov_len = sizeof(outarg);
2159
2160 err = send_notify_iov(f, ch, FUSE_NOTIFY_RETRIEVE, iov, 2);
2161 if (err) {
2162 pthread_mutex_lock(&f->lock);
2163 list_del_nreq(&rreq->nreq);
2164 pthread_mutex_unlock(&f->lock);
2165 free(rreq);
2166 }
2167
2168 return err;
2169 }
2170
2171 void *fuse_req_userdata(fuse_req_t req)
2172 {
2173 return req->f->userdata;
2174 }
2175
2176 const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
2177 {
2178 return &req->ctx;
2179 }
2180
2181 /*
2182 * The size of fuse_ctx got extended, so need to be careful about
2183 * incompatibility (i.e. a new binary cannot work with an old
2184 * library).
2185 */
2186 const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req);
2187 const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req)
2188 {
2189 return fuse_req_ctx(req);
2190 }
2191 #ifndef __NetBSD__
2192 FUSE_SYMVER(".symver fuse_req_ctx_compat24,fuse_req_ctx@FUSE_2.4");
2193 #endif
2194
2195
2196 void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
2197 void *data)
2198 {
2199 pthread_mutex_lock(&req->lock);
2200 pthread_mutex_lock(&req->f->lock);
2201 req->u.ni.func = func;
2202 req->u.ni.data = data;
2203 pthread_mutex_unlock(&req->f->lock);
2204 if (req->interrupted && func)
2205 func(req, data);
2206 pthread_mutex_unlock(&req->lock);
2207 }
2208
2209 int fuse_req_interrupted(fuse_req_t req)
2210 {
2211 int interrupted;
2212
2213 pthread_mutex_lock(&req->f->lock);
2214 interrupted = req->interrupted;
2215 pthread_mutex_unlock(&req->f->lock);
2216
2217 return interrupted;
2218 }
2219
2220 static struct {
2221 void (*func)(fuse_req_t, fuse_ino_t, const void *);
2222 const char *name;
2223 } fuse_ll_ops[] = {
2224 [FUSE_LOOKUP] = { do_lookup, "LOOKUP" },
2225 [FUSE_FORGET] = { do_forget, "FORGET" },
2226 [FUSE_GETATTR] = { do_getattr, "GETATTR" },
2227 [FUSE_SETATTR] = { do_setattr, "SETATTR" },
2228 [FUSE_READLINK] = { do_readlink, "READLINK" },
2229 [FUSE_SYMLINK] = { do_symlink, "SYMLINK" },
2230 [FUSE_MKNOD] = { do_mknod, "MKNOD" },
2231 [FUSE_MKDIR] = { do_mkdir, "MKDIR" },
2232 [FUSE_UNLINK] = { do_unlink, "UNLINK" },
2233 [FUSE_RMDIR] = { do_rmdir, "RMDIR" },
2234 [FUSE_RENAME] = { do_rename, "RENAME" },
2235 [FUSE_LINK] = { do_link, "LINK" },
2236 [FUSE_OPEN] = { do_open, "OPEN" },
2237 [FUSE_READ] = { do_read, "READ" },
2238 [FUSE_WRITE] = { do_write, "WRITE" },
2239 [FUSE_STATFS] = { do_statfs, "STATFS" },
2240 [FUSE_RELEASE] = { do_release, "RELEASE" },
2241 [FUSE_FSYNC] = { do_fsync, "FSYNC" },
2242 [FUSE_SETXATTR] = { do_setxattr, "SETXATTR" },
2243 [FUSE_GETXATTR] = { do_getxattr, "GETXATTR" },
2244 [FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" },
2245 [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
2246 [FUSE_FLUSH] = { do_flush, "FLUSH" },
2247 [FUSE_INIT] = { do_init, "INIT" },
2248 [FUSE_OPENDIR] = { do_opendir, "OPENDIR" },
2249 [FUSE_READDIR] = { do_readdir, "READDIR" },
2250 [FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" },
2251 [FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" },
2252 [FUSE_GETLK] = { do_getlk, "GETLK" },
2253 [FUSE_SETLK] = { do_setlk, "SETLK" },
2254 [FUSE_SETLKW] = { do_setlkw, "SETLKW" },
2255 [FUSE_ACCESS] = { do_access, "ACCESS" },
2256 [FUSE_CREATE] = { do_create, "CREATE" },
2257 [FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" },
2258 [FUSE_BMAP] = { do_bmap, "BMAP" },
2259 [FUSE_IOCTL] = { do_ioctl, "IOCTL" },
2260 [FUSE_POLL] = { do_poll, "POLL" },
2261 [FUSE_DESTROY] = { do_destroy, "DESTROY" },
2262 [FUSE_NOTIFY_REPLY] = { (void *) 1, "NOTIFY_REPLY" },
2263 [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
2264 [CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" },
2265 };
2266
2267 #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))
2268
2269 static const char *opname(enum fuse_opcode opcode)
2270 {
2271 if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
2272 return "???";
2273 else
2274 return fuse_ll_ops[opcode].name;
2275 }
2276
2277 static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst,
2278 struct fuse_bufvec *src)
2279 {
2280 int res = fuse_buf_copy(dst, src, 0);
2281 if (res < 0) {
2282 fprintf(stderr, "fuse: copy from pipe: %s\n", strerror(-res));
2283 return res;
2284 }
2285 if (res < fuse_buf_size(dst)) {
2286 fprintf(stderr, "fuse: copy from pipe: short read\n");
2287 return -1;
2288 }
2289 return 0;
2290 }
2291
2292 static void fuse_ll_process_buf(void *data, const struct fuse_buf *buf,
2293 struct fuse_chan *ch)
2294 {
2295 struct fuse_ll *f = (struct fuse_ll *) data;
2296 const size_t write_header_size = sizeof(struct fuse_in_header) +
2297 sizeof(struct fuse_write_in);
2298 struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
2299 struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size);
2300 struct fuse_in_header *in;
2301 const void *inarg;
2302 struct fuse_req *req;
2303 void *mbuf = NULL;
2304 int err;
2305 int res;
2306
2307 if (buf->flags & FUSE_BUF_IS_FD) {
2308 if (buf->size < tmpbuf.buf[0].size)
2309 tmpbuf.buf[0].size = buf->size;
2310
2311 mbuf = malloc(tmpbuf.buf[0].size);
2312 if (mbuf == NULL) {
2313 fprintf(stderr, "fuse: failed to allocate header\n");
2314 goto clear_pipe;
2315 }
2316 tmpbuf.buf[0].mem = mbuf;
2317
2318 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2319 if (res < 0)
2320 goto clear_pipe;
2321
2322 in = mbuf;
2323 } else {
2324 in = buf->mem;
2325 }
2326
2327 if (f->debug) {
2328 fprintf(stderr,
2329 "unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %zu, pid: %u\n",
2330 (unsigned long long) in->unique,
2331 opname((enum fuse_opcode) in->opcode), in->opcode,
2332 (unsigned long) in->nodeid, buf->size, in->pid);
2333 }
2334
2335 req = fuse_ll_alloc_req(f);
2336 if (req == NULL) {
2337 struct fuse_out_header out = {
2338 .unique = in->unique,
2339 .error = -ENOMEM,
2340 };
2341 struct iovec iov = {
2342 .iov_base = &out,
2343 .iov_len = sizeof(struct fuse_out_header),
2344 };
2345
2346 fuse_send_msg(f, ch, &iov, 1);
2347 goto clear_pipe;
2348 }
2349
2350 req->unique = in->unique;
2351 req->ctx.uid = in->uid;
2352 req->ctx.gid = in->gid;
2353 req->ctx.pid = in->pid;
2354 req->ch = ch;
2355
2356 err = EIO;
2357 if (!f->got_init) {
2358 enum fuse_opcode expected;
2359
2360 expected = f->cuse_data ? CUSE_INIT : FUSE_INIT;
2361 if (in->opcode != expected)
2362 goto reply_err;
2363 } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
2364 goto reply_err;
2365
2366 err = EACCES;
2367 if (f->allow_root && in->uid != f->owner && in->uid != 0 &&
2368 in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
2369 in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
2370 in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
2371 in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR &&
2372 in->opcode != FUSE_NOTIFY_REPLY)
2373 goto reply_err;
2374
2375 err = ENOSYS;
2376 if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
2377 goto reply_err;
2378 if (in->opcode != FUSE_INTERRUPT) {
2379 struct fuse_req *intr;
2380 pthread_mutex_lock(&f->lock);
2381 intr = check_interrupt(f, req);
2382 list_add_req(req, &f->list);
2383 pthread_mutex_unlock(&f->lock);
2384 if (intr)
2385 fuse_reply_err(intr, EAGAIN);
2386 }
2387
2388 if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size &&
2389 (in->opcode != FUSE_WRITE || !f->op.write_buf) &&
2390 in->opcode != FUSE_NOTIFY_REPLY) {
2391 void *newmbuf;
2392
2393 err = ENOMEM;
2394 newmbuf = realloc(mbuf, buf->size);
2395 if (newmbuf == NULL)
2396 goto reply_err;
2397 mbuf = newmbuf;
2398
2399 tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size);
2400 tmpbuf.buf[0].mem = mbuf + write_header_size;
2401
2402 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2403 err = -res;
2404 if (res < 0)
2405 goto reply_err;
2406
2407 in = mbuf;
2408 }
2409
2410 inarg = (void *) &in[1];
2411 if (in->opcode == FUSE_WRITE && f->op.write_buf)
2412 do_write_buf(req, in->nodeid, inarg, buf);
2413 else if (in->opcode == FUSE_NOTIFY_REPLY)
2414 do_notify_reply(req, in->nodeid, inarg, buf);
2415 else
2416 fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
2417
2418 out_free:
2419 free(mbuf);
2420 return;
2421
2422 reply_err:
2423 fuse_reply_err(req, err);
2424 clear_pipe:
2425 if (buf->flags & FUSE_BUF_IS_FD)
2426 fuse_ll_clear_pipe(f);
2427 goto out_free;
2428 }
2429
2430 static void fuse_ll_process(void *data, const char *buf, size_t len,
2431 struct fuse_chan *ch)
2432 {
2433 struct fuse_buf fbuf = {
2434 .mem = (void *) buf,
2435 .size = len,
2436 };
2437
2438 fuse_ll_process_buf(data, &fbuf, ch);
2439 }
2440
2441 enum {
2442 KEY_HELP,
2443 KEY_VERSION,
2444 };
2445
2446 static struct fuse_opt fuse_ll_opts[] = {
2447 { "debug", offsetof(struct fuse_ll, debug), 1 },
2448 { "-d", offsetof(struct fuse_ll, debug), 1 },
2449 { "allow_root", offsetof(struct fuse_ll, allow_root), 1 },
2450 { "max_write=%u", offsetof(struct fuse_ll, conn.max_write), 0 },
2451 { "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 },
2452 { "max_background=%u", offsetof(struct fuse_ll, conn.max_background), 0 },
2453 { "congestion_threshold=%u",
2454 offsetof(struct fuse_ll, conn.congestion_threshold), 0 },
2455 { "async_read", offsetof(struct fuse_ll, conn.async_read), 1 },
2456 { "sync_read", offsetof(struct fuse_ll, conn.async_read), 0 },
2457 { "atomic_o_trunc", offsetof(struct fuse_ll, atomic_o_trunc), 1},
2458 { "no_remote_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1},
2459 { "no_remote_lock", offsetof(struct fuse_ll, no_remote_flock), 1},
2460 { "no_remote_flock", offsetof(struct fuse_ll, no_remote_flock), 1},
2461 { "no_remote_posix_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1},
2462 { "big_writes", offsetof(struct fuse_ll, big_writes), 1},
2463 { "splice_write", offsetof(struct fuse_ll, splice_write), 1},
2464 { "no_splice_write", offsetof(struct fuse_ll, no_splice_write), 1},
2465 { "splice_move", offsetof(struct fuse_ll, splice_move), 1},
2466 { "no_splice_move", offsetof(struct fuse_ll, no_splice_move), 1},
2467 { "splice_read", offsetof(struct fuse_ll, splice_read), 1},
2468 { "no_splice_read", offsetof(struct fuse_ll, no_splice_read), 1},
2469 FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD),
2470 FUSE_OPT_KEY("-h", KEY_HELP),
2471 FUSE_OPT_KEY("--help", KEY_HELP),
2472 FUSE_OPT_KEY("-V", KEY_VERSION),
2473 FUSE_OPT_KEY("--version", KEY_VERSION),
2474 FUSE_OPT_END
2475 };
2476
2477 static void fuse_ll_version(void)
2478 {
2479 fprintf(stderr, "using FUSE kernel interface version %i.%i\n",
2480 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
2481 }
2482
2483 static void fuse_ll_help(void)
2484 {
2485 fprintf(stderr,
2486 " -o max_write=N set maximum size of write requests\n"
2487 " -o max_readahead=N set maximum readahead\n"
2488 " -o max_background=N set number of maximum background requests\n"
2489 " -o congestion_threshold=N set kernel's congestion threshold\n"
2490 " -o async_read perform reads asynchronously (default)\n"
2491 " -o sync_read perform reads synchronously\n"
2492 " -o atomic_o_trunc enable atomic open+truncate support\n"
2493 " -o big_writes enable larger than 4kB writes\n"
2494 " -o no_remote_lock disable remote file locking\n"
2495 " -o no_remote_flock disable remote file locking (BSD)\n"
2496 " -o no_remote_posix_lock disable remove file locking (POSIX)\n"
2497 " -o [no_]splice_write use splice to write to the fuse device\n"
2498 " -o [no_]splice_move move data while splicing to the fuse device\n"
2499 " -o [no_]splice_read use splice to read from the fuse device\n"
2500 );
2501 }
2502
2503 static int fuse_ll_opt_proc(void *data, const char *arg, int key,
2504 struct fuse_args *outargs)
2505 {
2506 (void) data; (void) outargs;
2507
2508 switch (key) {
2509 case KEY_HELP:
2510 fuse_ll_help();
2511 break;
2512
2513 case KEY_VERSION:
2514 fuse_ll_version();
2515 break;
2516
2517 default:
2518 fprintf(stderr, "fuse: unknown option `%s'\n", arg);
2519 }
2520
2521 return -1;
2522 }
2523
2524 int fuse_lowlevel_is_lib_option(const char *opt)
2525 {
2526 return fuse_opt_match(fuse_ll_opts, opt);
2527 }
2528
2529 static void fuse_ll_destroy(void *data)
2530 {
2531 struct fuse_ll *f = (struct fuse_ll *) data;
2532 struct fuse_ll_pipe *llp;
2533
2534 if (f->got_init && !f->got_destroy) {
2535 if (f->op.destroy)
2536 f->op.destroy(f->userdata);
2537 }
2538 llp = pthread_getspecific(f->pipe_key);
2539 if (llp != NULL)
2540 fuse_ll_pipe_free(llp);
2541 pthread_key_delete(f->pipe_key);
2542 pthread_mutex_destroy(&f->lock);
2543 free(f->cuse_data);
2544 free(f);
2545 }
2546
2547 static void fuse_ll_pipe_destructor(void *data)
2548 {
2549 struct fuse_ll_pipe *llp = data;
2550 fuse_ll_pipe_free(llp);
2551 }
2552
2553 #ifdef HAVE_SPLICE
2554 static int fuse_ll_receive_buf(struct fuse_session *se, struct fuse_buf *buf,
2555 struct fuse_chan **chp)
2556 {
2557 struct fuse_chan *ch = *chp;
2558 struct fuse_ll *f = fuse_session_data(se);
2559 size_t bufsize = buf->size;
2560 struct fuse_ll_pipe *llp;
2561 struct fuse_buf tmpbuf;
2562 int err;
2563 int res;
2564
2565 if (f->conn.proto_minor < 14 || !(f->conn.want & FUSE_CAP_SPLICE_READ))
2566 goto fallback;
2567
2568 llp = fuse_ll_get_pipe(f);
2569 if (llp == NULL)
2570 goto fallback;
2571
2572 if (llp->size < bufsize) {
2573 if (llp->can_grow) {
2574 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize);
2575 if (res == -1) {
2576 llp->can_grow = 0;
2577 goto fallback;
2578 }
2579 llp->size = res;
2580 }
2581 if (llp->size < bufsize)
2582 goto fallback;
2583 }
2584
2585 res = splice(fuse_chan_fd(ch), NULL, llp->pipe[1], NULL, bufsize, 0);
2586 err = errno;
2587
2588 if (fuse_session_exited(se))
2589 return 0;
2590
2591 if (res == -1) {
2592 if (err == ENODEV) {
2593 fuse_session_exit(se);
2594 return 0;
2595 }
2596 if (err != EINTR && err != EAGAIN)
2597 perror("fuse: splice from device");
2598 return -err;
2599 }
2600
2601 if (res < sizeof(struct fuse_in_header)) {
2602 fprintf(stderr, "short splice from fuse device\n");
2603 return -EIO;
2604 }
2605
2606 tmpbuf = (struct fuse_buf) {
2607 .size = res,
2608 .flags = FUSE_BUF_IS_FD,
2609 .fd = llp->pipe[0],
2610 };
2611
2612 /*
2613 * Don't bother with zero copy for small requests.
2614 * fuse_loop_mt() needs to check for FORGET so this more than
2615 * just an optimization.
2616 */
2617 if (res < sizeof(struct fuse_in_header) +
2618 sizeof(struct fuse_write_in) + pagesize) {
2619 struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 };
2620 struct fuse_bufvec dst = { .buf[0] = *buf, .count = 1 };
2621
2622 res = fuse_buf_copy(&dst, &src, 0);
2623 if (res < 0) {
2624 fprintf(stderr, "fuse: copy from pipe: %s\n",
2625 strerror(-res));
2626 fuse_ll_clear_pipe(f);
2627 return res;
2628 }
2629 if (res < tmpbuf.size) {
2630 fprintf(stderr, "fuse: copy from pipe: short read\n");
2631 fuse_ll_clear_pipe(f);
2632 return -EIO;
2633 }
2634 buf->size = tmpbuf.size;
2635 return buf->size;
2636 }
2637
2638 *buf = tmpbuf;
2639
2640 return res;
2641
2642 fallback:
2643 res = fuse_chan_recv(chp, buf->mem, bufsize);
2644 if (res <= 0)
2645 return res;
2646
2647 buf->size = res;
2648
2649 return res;
2650 }
2651 #else
2652 static int fuse_ll_receive_buf(struct fuse_session *se, struct fuse_buf *buf,
2653 struct fuse_chan **chp)
2654 {
2655 (void) se;
2656
2657 int res = fuse_chan_recv(chp, buf->mem, buf->size);
2658 if (res <= 0)
2659 return res;
2660
2661 buf->size = res;
2662
2663 return res;
2664 }
2665 #endif
2666
2667
2668 /*
2669 * always call fuse_lowlevel_new_common() internally, to work around a
2670 * misfeature in the FreeBSD runtime linker, which links the old
2671 * version of a symbol to internal references.
2672 */
2673 struct fuse_session *fuse_lowlevel_new_common(struct fuse_args *args,
2674 const struct fuse_lowlevel_ops *op,
2675 size_t op_size, void *userdata)
2676 {
2677 int err;
2678 struct fuse_ll *f;
2679 struct fuse_session *se;
2680 struct fuse_session_ops sop = {
2681 .process = fuse_ll_process,
2682 .destroy = fuse_ll_destroy,
2683 };
2684
2685 if (sizeof(struct fuse_lowlevel_ops) < op_size) {
2686 fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
2687 op_size = sizeof(struct fuse_lowlevel_ops);
2688 }
2689
2690 f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll));
2691 if (f == NULL) {
2692 fprintf(stderr, "fuse: failed to allocate fuse object\n");
2693 goto out;
2694 }
2695
2696 f->conn.async_read = 1;
2697 f->conn.max_write = UINT_MAX;
2698 f->conn.max_readahead = UINT_MAX;
2699 f->atomic_o_trunc = 0;
2700 list_init_req(&f->list);
2701 list_init_req(&f->interrupts);
2702 list_init_nreq(&f->notify_list);
2703 f->notify_ctr = 1;
2704 fuse_mutex_init(&f->lock);
2705
2706 err = pthread_key_create(&f->pipe_key, fuse_ll_pipe_destructor);
2707 if (err) {
2708 fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
2709 strerror(err));
2710 goto out_free;
2711 }
2712
2713 if (fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1)
2714 goto out_key_destroy;
2715
2716 if (f->debug)
2717 fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION);
2718
2719 memcpy(&f->op, op, op_size);
2720 f->owner = getuid();
2721 f->userdata = userdata;
2722
2723 se = fuse_session_new(&sop, f);
2724 if (!se)
2725 goto out_key_destroy;
2726
2727 se->receive_buf = fuse_ll_receive_buf;
2728 se->process_buf = fuse_ll_process_buf;
2729
2730 return se;
2731
2732 out_key_destroy:
2733 pthread_key_delete(f->pipe_key);
2734 out_free:
2735 pthread_mutex_destroy(&f->lock);
2736 free(f);
2737 out:
2738 return NULL;
2739 }
2740
2741
2742 struct fuse_session *fuse_lowlevel_new(struct fuse_args *args,
2743 const struct fuse_lowlevel_ops *op,
2744 size_t op_size, void *userdata)
2745 {
2746 return fuse_lowlevel_new_common(args, op, op_size, userdata);
2747 }
2748
2749 #ifdef linux
2750 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
2751 {
2752 char *buf;
2753 size_t bufsize = 1024;
2754 char path[128];
2755 int ret;
2756 int fd;
2757 unsigned long pid = req->ctx.pid;
2758 char *s;
2759
2760 sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);
2761
2762 retry:
2763 buf = malloc(bufsize);
2764 if (buf == NULL)
2765 return -ENOMEM;
2766
2767 ret = -EIO;
2768 fd = open(path, O_RDONLY);
2769 if (fd == -1)
2770 goto out_free;
2771
2772 ret = read(fd, buf, bufsize);
2773 close(fd);
2774 if (ret == -1) {
2775 ret = -EIO;
2776 goto out_free;
2777 }
2778
2779 if (ret == bufsize) {
2780 free(buf);
2781 bufsize *= 4;
2782 goto retry;
2783 }
2784
2785 ret = -EIO;
2786 s = strstr(buf, "\nGroups:");
2787 if (s == NULL)
2788 goto out_free;
2789
2790 s += 8;
2791 ret = 0;
2792 while (1) {
2793 char *end;
2794 unsigned long val = strtoul(s, &end, 0);
2795 if (end == s)
2796 break;
2797
2798 s = end;
2799 if (ret < size)
2800 list[ret] = val;
2801 ret++;
2802 }
2803
2804 out_free:
2805 free(buf);
2806 return ret;
2807 }
2808 #else /* linux */
2809 /*
2810 * This is currently not implemented on other than Linux...
2811 */
2812 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
2813 {
2814 return -ENOSYS;
2815 }
2816 #endif
2817
2818 #if !defined(__FreeBSD__) && !defined(__NetBSD__)
2819
2820 static void fill_open_compat(struct fuse_open_out *arg,
2821 const struct fuse_file_info_compat *f)
2822 {
2823 arg->fh = f->fh;
2824 if (f->direct_io)
2825 arg->open_flags |= FOPEN_DIRECT_IO;
2826 if (f->keep_cache)
2827 arg->open_flags |= FOPEN_KEEP_CACHE;
2828 }
2829
2830 static void convert_statfs_compat(const struct statfs *compatbuf,
2831 struct statvfs *buf)
2832 {
2833 buf->f_bsize = compatbuf->f_bsize;
2834 buf->f_blocks = compatbuf->f_blocks;
2835 buf->f_bfree = compatbuf->f_bfree;
2836 buf->f_bavail = compatbuf->f_bavail;
2837 buf->f_files = compatbuf->f_files;
2838 buf->f_ffree = compatbuf->f_ffree;
2839 buf->f_namemax = compatbuf->f_namelen;
2840 }
2841
2842 int fuse_reply_open_compat(fuse_req_t req,
2843 const struct fuse_file_info_compat *f)
2844 {
2845 struct fuse_open_out arg;
2846
2847 memset(&arg, 0, sizeof(arg));
2848 fill_open_compat(&arg, f);
2849 return send_reply_ok(req, &arg, sizeof(arg));
2850 }
2851
2852 int fuse_reply_statfs_compat(fuse_req_t req, const struct statfs *stbuf)
2853 {
2854 struct statvfs newbuf;
2855
2856 memset(&newbuf, 0, sizeof(newbuf));
2857 convert_statfs_compat(stbuf, &newbuf);
2858
2859 return fuse_reply_statfs(req, &newbuf);
2860 }
2861
2862 struct fuse_session *fuse_lowlevel_new_compat(const char *opts,
2863 const struct fuse_lowlevel_ops_compat *op,
2864 size_t op_size, void *userdata)
2865 {
2866 struct fuse_session *se;
2867 struct fuse_args args = FUSE_ARGS_INIT(0, NULL);
2868
2869 if (opts &&
2870 (fuse_opt_add_arg(&args, "") == -1 ||
2871 fuse_opt_add_arg(&args, "-o") == -1 ||
2872 fuse_opt_add_arg(&args, opts) == -1)) {
2873 fuse_opt_free_args(&args);
2874 return NULL;
2875 }
2876 se = fuse_lowlevel_new(&args, (const struct fuse_lowlevel_ops *) op,
2877 op_size, userdata);
2878 fuse_opt_free_args(&args);
2879
2880 return se;
2881 }
2882
2883 struct fuse_ll_compat_conf {
2884 unsigned max_read;
2885 int set_max_read;
2886 };
2887
2888 static const struct fuse_opt fuse_ll_opts_compat[] = {
2889 { "max_read=", offsetof(struct fuse_ll_compat_conf, set_max_read), 1 },
2890 { "max_read=%u", offsetof(struct fuse_ll_compat_conf, max_read), 0 },
2891 FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_KEEP),
2892 FUSE_OPT_END
2893 };
2894
2895 int fuse_sync_compat_args(struct fuse_args *args)
2896 {
2897 struct fuse_ll_compat_conf conf;
2898
2899 memset(&conf, 0, sizeof(conf));
2900 if (fuse_opt_parse(args, &conf, fuse_ll_opts_compat, NULL) == -1)
2901 return -1;
2902
2903 if (fuse_opt_insert_arg(args, 1, "-osync_read"))
2904 return -1;
2905
2906 if (conf.set_max_read) {
2907 char tmpbuf[64];
2908
2909 sprintf(tmpbuf, "-omax_readahead=%u", conf.max_read);
2910 if (fuse_opt_insert_arg(args, 1, tmpbuf) == -1)
2911 return -1;
2912 }
2913 return 0;
2914 }
2915
2916 FUSE_SYMVER(".symver fuse_reply_statfs_compat,fuse_reply_statfs@FUSE_2.4");
2917 FUSE_SYMVER(".symver fuse_reply_open_compat,fuse_reply_open@FUSE_2.4");
2918 FUSE_SYMVER(".symver fuse_lowlevel_new_compat,fuse_lowlevel_new@FUSE_2.4");
2919
2920 #else /* __FreeBSD__ || __NetBSD__ */
2921
2922 int fuse_sync_compat_args(struct fuse_args *args)
2923 {
2924 (void) args;
2925 return 0;
2926 }
2927
2928 #endif /* __FreeBSD__ || __NetBSD__ */
2929
2930 struct fuse_session *fuse_lowlevel_new_compat25(struct fuse_args *args,
2931 const struct fuse_lowlevel_ops_compat25 *op,
2932 size_t op_size, void *userdata)
2933 {
2934 if (fuse_sync_compat_args(args) == -1)
2935 return NULL;
2936
2937 return fuse_lowlevel_new_common(args,
2938 (const struct fuse_lowlevel_ops *) op,
2939 op_size, userdata);
2940 }
2941
2942 FUSE_SYMVER(".symver fuse_lowlevel_new_compat25,fuse_lowlevel_new@FUSE_2.5");
mirror for fuse