libfuse

fuse_lowlevel.c
1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
4
5 Implementation of (most of) the low-level FUSE API. The session loop
6 functions are implemented in separate files.
7
8 This program can be distributed under the terms of the GNU LGPLv2.
9 See the file COPYING.LIB
10 */
11
12 #define _GNU_SOURCE
13
14 #include "fuse_config.h"
15 #include "fuse_i.h"
16 #include "fuse_kernel.h"
17 #include "fuse_opt.h"
18 #include "fuse_misc.h"
19 #include "mount_util.h"
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stddef.h>
24 #include <string.h>
25 #include <unistd.h>
26 #include <limits.h>
27 #include <errno.h>
28 #include <assert.h>
29 #include <sys/file.h>
30
31 #ifndef F_LINUX_SPECIFIC_BASE
32 #define F_LINUX_SPECIFIC_BASE 1024
33 #endif
34 #ifndef F_SETPIPE_SZ
35 #define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
36 #endif
37
38
39 #define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg)))
40 #define OFFSET_MAX 0x7fffffffffffffffLL
41
42 #define container_of(ptr, type, member) ({ \
43 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
44 (type *)( (char *)__mptr - offsetof(type,member) );})
45
46 struct fuse_pollhandle {
47 uint64_t kh;
48 struct fuse_session *se;
49 };
50
51 static size_t pagesize;
52
53 static __attribute__((constructor)) void fuse_ll_init_pagesize(void)
54 {
55 pagesize = getpagesize();
56 }
57
58 static void convert_stat(const struct stat *stbuf, struct fuse_attr *attr)
59 {
60 attr->ino = stbuf->st_ino;
61 attr->mode = stbuf->st_mode;
62 attr->nlink = stbuf->st_nlink;
63 attr->uid = stbuf->st_uid;
64 attr->gid = stbuf->st_gid;
65 attr->rdev = stbuf->st_rdev;
66 attr->size = stbuf->st_size;
67 attr->blksize = stbuf->st_blksize;
68 attr->blocks = stbuf->st_blocks;
69 attr->atime = stbuf->st_atime;
70 attr->mtime = stbuf->st_mtime;
71 attr->ctime = stbuf->st_ctime;
72 attr->atimensec = ST_ATIM_NSEC(stbuf);
73 attr->mtimensec = ST_MTIM_NSEC(stbuf);
74 attr->ctimensec = ST_CTIM_NSEC(stbuf);
75 }
76
77 static void convert_attr(const struct fuse_setattr_in *attr, struct stat *stbuf)
78 {
79 stbuf->st_mode = attr->mode;
80 stbuf->st_uid = attr->uid;
81 stbuf->st_gid = attr->gid;
82 stbuf->st_size = attr->size;
83 stbuf->st_atime = attr->atime;
84 stbuf->st_mtime = attr->mtime;
85 stbuf->st_ctime = attr->ctime;
86 ST_ATIM_NSEC_SET(stbuf, attr->atimensec);
87 ST_MTIM_NSEC_SET(stbuf, attr->mtimensec);
88 ST_CTIM_NSEC_SET(stbuf, attr->ctimensec);
89 }
90
91 static size_t iov_length(const struct iovec *iov, size_t count)
92 {
93 size_t seg;
94 size_t ret = 0;
95
96 for (seg = 0; seg < count; seg++)
97 ret += iov[seg].iov_len;
98 return ret;
99 }
100
101 static void list_init_req(struct fuse_req *req)
102 {
103 req->next = req;
104 req->prev = req;
105 }
106
107 static void list_del_req(struct fuse_req *req)
108 {
109 struct fuse_req *prev = req->prev;
110 struct fuse_req *next = req->next;
111 prev->next = next;
112 next->prev = prev;
113 }
114
115 static void list_add_req(struct fuse_req *req, struct fuse_req *next)
116 {
117 struct fuse_req *prev = next->prev;
118 req->next = next;
119 req->prev = prev;
120 prev->next = req;
121 next->prev = req;
122 }
123
124 static void destroy_req(fuse_req_t req)
125 {
126 assert(req->ch == NULL);
127 pthread_mutex_destroy(&req->lock);
128 free(req);
129 }
130
131 void fuse_free_req(fuse_req_t req)
132 {
133 int ctr;
134 struct fuse_session *se = req->se;
135
136 pthread_mutex_lock(&se->lock);
137 req->u.ni.func = NULL;
138 req->u.ni.data = NULL;
139 list_del_req(req);
140 ctr = --req->ctr;
141 fuse_chan_put(req->ch);
142 req->ch = NULL;
143 pthread_mutex_unlock(&se->lock);
144 if (!ctr)
145 destroy_req(req);
146 }
147
148 static struct fuse_req *fuse_ll_alloc_req(struct fuse_session *se)
149 {
150 struct fuse_req *req;
151
152 req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
153 if (req == NULL) {
154 fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate request\n");
155 } else {
156 req->se = se;
157 req->ctr = 1;
158 list_init_req(req);
159 pthread_mutex_init(&req->lock, NULL);
160 }
161
162 return req;
163 }
164
165 /* Send data. If *ch* is NULL, send via session master fd */
166 static int fuse_send_msg(struct fuse_session *se, struct fuse_chan *ch,
167 struct iovec *iov, int count)
168 {
169 struct fuse_out_header *out = iov[0].iov_base;
170
171 assert(se != NULL);
172 out->len = iov_length(iov, count);
173 if (se->debug) {
174 if (out->unique == 0) {
175 fuse_log(FUSE_LOG_DEBUG, "NOTIFY: code=%d length=%u\n",
176 out->error, out->len);
177 } else if (out->error) {
178 fuse_log(FUSE_LOG_DEBUG,
179 " unique: %llu, error: %i (%s), outsize: %i\n",
180 (unsigned long long) out->unique, out->error,
181 strerror(-out->error), out->len);
182 } else {
183 fuse_log(FUSE_LOG_DEBUG,
184 " unique: %llu, success, outsize: %i\n",
185 (unsigned long long) out->unique, out->len);
186 }
187 }
188
189 ssize_t res;
190 if (se->io != NULL)
191 /* se->io->writev is never NULL if se->io is not NULL as
192 specified by fuse_session_custom_io()*/
193 res = se->io->writev(ch ? ch->fd : se->fd, iov, count,
194 se->userdata);
195 else
196 res = writev(ch ? ch->fd : se->fd, iov, count);
197
198 int err = errno;
199
200 if (res == -1) {
201 /* ENOENT means the operation was interrupted */
202 if (!fuse_session_exited(se) && err != ENOENT)
203 perror("fuse: writing device");
204 return -err;
205 }
206
207 return 0;
208 }
209
210
211 int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
212 int count)
213 {
214 struct fuse_out_header out;
215
216 if (error <= -1000 || error > 0) {
217 fuse_log(FUSE_LOG_ERR, "fuse: bad error value: %i\n", error);
218 error = -ERANGE;
219 }
220
221 out.unique = req->unique;
222 out.error = error;
223
224 iov[0].iov_base = &out;
225 iov[0].iov_len = sizeof(struct fuse_out_header);
226
227 return fuse_send_msg(req->se, req->ch, iov, count);
228 }
229
230 static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
231 int count)
232 {
233 int res;
234
235 res = fuse_send_reply_iov_nofree(req, error, iov, count);
236 fuse_free_req(req);
237 return res;
238 }
239
240 static int send_reply(fuse_req_t req, int error, const void *arg,
241 size_t argsize)
242 {
243 struct iovec iov[2];
244 int count = 1;
245 if (argsize) {
246 iov[1].iov_base = (void *) arg;
247 iov[1].iov_len = argsize;
248 count++;
249 }
250 return send_reply_iov(req, error, iov, count);
251 }
252
253 int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
254 {
255 int res;
256 struct iovec *padded_iov;
257
258 padded_iov = malloc((count + 1) * sizeof(struct iovec));
259 if (padded_iov == NULL)
260 return fuse_reply_err(req, ENOMEM);
261
262 memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
263 count++;
264
265 res = send_reply_iov(req, 0, padded_iov, count);
266 free(padded_iov);
267
268 return res;
269 }
270
271
272 /* `buf` is allowed to be empty so that the proper size may be
273 allocated by the caller */
274 size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
275 const char *name, const struct stat *stbuf, off_t off)
276 {
277 (void)req;
278 size_t namelen;
279 size_t entlen;
280 size_t entlen_padded;
281 struct fuse_dirent *dirent;
282
283 namelen = strlen(name);
284 entlen = FUSE_NAME_OFFSET + namelen;
285 entlen_padded = FUSE_DIRENT_ALIGN(entlen);
286
287 if ((buf == NULL) || (entlen_padded > bufsize))
288 return entlen_padded;
289
290 dirent = (struct fuse_dirent*) buf;
291 dirent->ino = stbuf->st_ino;
292 dirent->off = off;
293 dirent->namelen = namelen;
294 dirent->type = (stbuf->st_mode & S_IFMT) >> 12;
295 memcpy(dirent->name, name, namelen);
296 memset(dirent->name + namelen, 0, entlen_padded - entlen);
297
298 return entlen_padded;
299 }
300
301 static void convert_statfs(const struct statvfs *stbuf,
302 struct fuse_kstatfs *kstatfs)
303 {
304 kstatfs->bsize = stbuf->f_bsize;
305 kstatfs->frsize = stbuf->f_frsize;
306 kstatfs->blocks = stbuf->f_blocks;
307 kstatfs->bfree = stbuf->f_bfree;
308 kstatfs->bavail = stbuf->f_bavail;
309 kstatfs->files = stbuf->f_files;
310 kstatfs->ffree = stbuf->f_ffree;
311 kstatfs->namelen = stbuf->f_namemax;
312 }
313
314 static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize)
315 {
316 return send_reply(req, 0, arg, argsize);
317 }
318
319 int fuse_reply_err(fuse_req_t req, int err)
320 {
321 return send_reply(req, -err, NULL, 0);
322 }
323
324 void fuse_reply_none(fuse_req_t req)
325 {
326 fuse_free_req(req);
327 }
328
329 static unsigned long calc_timeout_sec(double t)
330 {
331 if (t > (double) ULONG_MAX)
332 return ULONG_MAX;
333 else if (t < 0.0)
334 return 0;
335 else
336 return (unsigned long) t;
337 }
338
339 static unsigned int calc_timeout_nsec(double t)
340 {
341 double f = t - (double) calc_timeout_sec(t);
342 if (f < 0.0)
343 return 0;
344 else if (f >= 0.999999999)
345 return 999999999;
346 else
347 return (unsigned int) (f * 1.0e9);
348 }
349
350 static void fill_entry(struct fuse_entry_out *arg,
351 const struct fuse_entry_param *e)
352 {
353 arg->nodeid = e->ino;
354 arg->generation = e->generation;
355 arg->entry_valid = calc_timeout_sec(e->entry_timeout);
356 arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout);
357 arg->attr_valid = calc_timeout_sec(e->attr_timeout);
358 arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout);
359 convert_stat(&e->attr, &arg->attr);
360 }
361
362 /* `buf` is allowed to be empty so that the proper size may be
363 allocated by the caller */
364 size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize,
365 const char *name,
366 const struct fuse_entry_param *e, off_t off)
367 {
368 (void)req;
369 size_t namelen;
370 size_t entlen;
371 size_t entlen_padded;
372
373 namelen = strlen(name);
374 entlen = FUSE_NAME_OFFSET_DIRENTPLUS + namelen;
375 entlen_padded = FUSE_DIRENT_ALIGN(entlen);
376 if ((buf == NULL) || (entlen_padded > bufsize))
377 return entlen_padded;
378
379 struct fuse_direntplus *dp = (struct fuse_direntplus *) buf;
380 memset(&dp->entry_out, 0, sizeof(dp->entry_out));
381 fill_entry(&dp->entry_out, e);
382
383 struct fuse_dirent *dirent = &dp->dirent;
384 dirent->ino = e->attr.st_ino;
385 dirent->off = off;
386 dirent->namelen = namelen;
387 dirent->type = (e->attr.st_mode & S_IFMT) >> 12;
388 memcpy(dirent->name, name, namelen);
389 memset(dirent->name + namelen, 0, entlen_padded - entlen);
390
391 return entlen_padded;
392 }
393
394 static void fill_open(struct fuse_open_out *arg,
395 const struct fuse_file_info *f)
396 {
397 arg->fh = f->fh;
398 if (f->direct_io)
399 arg->open_flags |= FOPEN_DIRECT_IO;
400 if (f->keep_cache)
401 arg->open_flags |= FOPEN_KEEP_CACHE;
402 if (f->cache_readdir)
403 arg->open_flags |= FOPEN_CACHE_DIR;
404 if (f->nonseekable)
405 arg->open_flags |= FOPEN_NONSEEKABLE;
406 if (f->noflush)
407 arg->open_flags |= FOPEN_NOFLUSH;
408 }
409
410 int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
411 {
412 struct fuse_entry_out arg;
413 size_t size = req->se->conn.proto_minor < 9 ?
414 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);
415
416 /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
417 negative entry */
418 if (!e->ino && req->se->conn.proto_minor < 4)
419 return fuse_reply_err(req, ENOENT);
420
421 memset(&arg, 0, sizeof(arg));
422 fill_entry(&arg, e);
423 return send_reply_ok(req, &arg, size);
424 }
425
426 int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
427 const struct fuse_file_info *f)
428 {
429 char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)];
430 size_t entrysize = req->se->conn.proto_minor < 9 ?
431 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
432 struct fuse_entry_out *earg = (struct fuse_entry_out *) buf;
433 struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize);
434
435 memset(buf, 0, sizeof(buf));
436 fill_entry(earg, e);
437 fill_open(oarg, f);
438 return send_reply_ok(req, buf,
439 entrysize + sizeof(struct fuse_open_out));
440 }
441
442 int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
443 double attr_timeout)
444 {
445 struct fuse_attr_out arg;
446 size_t size = req->se->conn.proto_minor < 9 ?
447 FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);
448
449 memset(&arg, 0, sizeof(arg));
450 arg.attr_valid = calc_timeout_sec(attr_timeout);
451 arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout);
452 convert_stat(attr, &arg.attr);
453
454 return send_reply_ok(req, &arg, size);
455 }
456
457 int fuse_reply_readlink(fuse_req_t req, const char *linkname)
458 {
459 return send_reply_ok(req, linkname, strlen(linkname));
460 }
461
462 int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f)
463 {
464 struct fuse_open_out arg;
465
466 memset(&arg, 0, sizeof(arg));
467 fill_open(&arg, f);
468 return send_reply_ok(req, &arg, sizeof(arg));
469 }
470
471 int fuse_reply_write(fuse_req_t req, size_t count)
472 {
473 struct fuse_write_out arg;
474
475 memset(&arg, 0, sizeof(arg));
476 arg.size = count;
477
478 return send_reply_ok(req, &arg, sizeof(arg));
479 }
480
481 int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
482 {
483 return send_reply_ok(req, buf, size);
484 }
485
486 static int fuse_send_data_iov_fallback(struct fuse_session *se,
487 struct fuse_chan *ch,
488 struct iovec *iov, int iov_count,
489 struct fuse_bufvec *buf,
490 size_t len)
491 {
492 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
493 void *mbuf;
494 int res;
495
496 /* Optimize common case */
497 if (buf->count == 1 && buf->idx == 0 && buf->off == 0 &&
498 !(buf->buf[0].flags & FUSE_BUF_IS_FD)) {
499 /* FIXME: also avoid memory copy if there are multiple buffers
500 but none of them contain an fd */
501
502 iov[iov_count].iov_base = buf->buf[0].mem;
503 iov[iov_count].iov_len = len;
504 iov_count++;
505 return fuse_send_msg(se, ch, iov, iov_count);
506 }
507
508 res = posix_memalign(&mbuf, pagesize, len);
509 if (res != 0)
510 return res;
511
512 mem_buf.buf[0].mem = mbuf;
513 res = fuse_buf_copy(&mem_buf, buf, 0);
514 if (res < 0) {
515 free(mbuf);
516 return -res;
517 }
518 len = res;
519
520 iov[iov_count].iov_base = mbuf;
521 iov[iov_count].iov_len = len;
522 iov_count++;
523 res = fuse_send_msg(se, ch, iov, iov_count);
524 free(mbuf);
525
526 return res;
527 }
528
529 struct fuse_ll_pipe {
530 size_t size;
531 int can_grow;
532 int pipe[2];
533 };
534
535 static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp)
536 {
537 close(llp->pipe[0]);
538 close(llp->pipe[1]);
539 free(llp);
540 }
541
542 #ifdef HAVE_SPLICE
543 #if !defined(HAVE_PIPE2) || !defined(O_CLOEXEC)
544 static int fuse_pipe(int fds[2])
545 {
546 int rv = pipe(fds);
547
548 if (rv == -1)
549 return rv;
550
551 if (fcntl(fds[0], F_SETFL, O_NONBLOCK) == -1 ||
552 fcntl(fds[1], F_SETFL, O_NONBLOCK) == -1 ||
553 fcntl(fds[0], F_SETFD, FD_CLOEXEC) == -1 ||
554 fcntl(fds[1], F_SETFD, FD_CLOEXEC) == -1) {
555 close(fds[0]);
556 close(fds[1]);
557 rv = -1;
558 }
559 return rv;
560 }
561 #else
562 static int fuse_pipe(int fds[2])
563 {
564 return pipe2(fds, O_CLOEXEC | O_NONBLOCK);
565 }
566 #endif
567
568 static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_session *se)
569 {
570 struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
571 if (llp == NULL) {
572 int res;
573
574 llp = malloc(sizeof(struct fuse_ll_pipe));
575 if (llp == NULL)
576 return NULL;
577
578 res = fuse_pipe(llp->pipe);
579 if (res == -1) {
580 free(llp);
581 return NULL;
582 }
583
584 /*
585 *the default size is 16 pages on linux
586 */
587 llp->size = pagesize * 16;
588 llp->can_grow = 1;
589
590 pthread_setspecific(se->pipe_key, llp);
591 }
592
593 return llp;
594 }
595 #endif
596
597 static void fuse_ll_clear_pipe(struct fuse_session *se)
598 {
599 struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
600 if (llp) {
601 pthread_setspecific(se->pipe_key, NULL);
602 fuse_ll_pipe_free(llp);
603 }
604 }
605
606 #if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE)
607 static int read_back(int fd, char *buf, size_t len)
608 {
609 int res;
610
611 res = read(fd, buf, len);
612 if (res == -1) {
613 fuse_log(FUSE_LOG_ERR, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno));
614 return -EIO;
615 }
616 if (res != len) {
617 fuse_log(FUSE_LOG_ERR, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len);
618 return -EIO;
619 }
620 return 0;
621 }
622
623 static int grow_pipe_to_max(int pipefd)
624 {
625 int max;
626 int res;
627 int maxfd;
628 char buf[32];
629
630 maxfd = open("/proc/sys/fs/pipe-max-size", O_RDONLY);
631 if (maxfd < 0)
632 return -errno;
633
634 res = read(maxfd, buf, sizeof(buf) - 1);
635 if (res < 0) {
636 int saved_errno;
637
638 saved_errno = errno;
639 close(maxfd);
640 return -saved_errno;
641 }
642 close(maxfd);
643 buf[res] = '\0';
644
645 max = atoi(buf);
646 res = fcntl(pipefd, F_SETPIPE_SZ, max);
647 if (res < 0)
648 return -errno;
649 return max;
650 }
651
652 static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
653 struct iovec *iov, int iov_count,
654 struct fuse_bufvec *buf, unsigned int flags)
655 {
656 int res;
657 size_t len = fuse_buf_size(buf);
658 struct fuse_out_header *out = iov[0].iov_base;
659 struct fuse_ll_pipe *llp;
660 int splice_flags;
661 size_t pipesize;
662 size_t total_buf_size;
663 size_t idx;
664 size_t headerlen;
665 struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len);
666
667 if (se->broken_splice_nonblock)
668 goto fallback;
669
670 if (flags & FUSE_BUF_NO_SPLICE)
671 goto fallback;
672
673 total_buf_size = 0;
674 for (idx = buf->idx; idx < buf->count; idx++) {
675 total_buf_size += buf->buf[idx].size;
676 if (idx == buf->idx)
677 total_buf_size -= buf->off;
678 }
679 if (total_buf_size < 2 * pagesize)
680 goto fallback;
681
682 if (se->conn.proto_minor < 14 ||
683 !(se->conn.want & FUSE_CAP_SPLICE_WRITE))
684 goto fallback;
685
686 llp = fuse_ll_get_pipe(se);
687 if (llp == NULL)
688 goto fallback;
689
690
691 headerlen = iov_length(iov, iov_count);
692
693 out->len = headerlen + len;
694
695 /*
696 * Heuristic for the required pipe size, does not work if the
697 * source contains less than page size fragments
698 */
699 pipesize = pagesize * (iov_count + buf->count + 1) + out->len;
700
701 if (llp->size < pipesize) {
702 if (llp->can_grow) {
703 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize);
704 if (res == -1) {
705 res = grow_pipe_to_max(llp->pipe[0]);
706 if (res > 0)
707 llp->size = res;
708 llp->can_grow = 0;
709 goto fallback;
710 }
711 llp->size = res;
712 }
713 if (llp->size < pipesize)
714 goto fallback;
715 }
716
717
718 res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK);
719 if (res == -1)
720 goto fallback;
721
722 if (res != headerlen) {
723 res = -EIO;
724 fuse_log(FUSE_LOG_ERR, "fuse: short vmsplice to pipe: %u/%zu\n", res,
725 headerlen);
726 goto clear_pipe;
727 }
728
729 pipe_buf.buf[0].flags = FUSE_BUF_IS_FD;
730 pipe_buf.buf[0].fd = llp->pipe[1];
731
732 res = fuse_buf_copy(&pipe_buf, buf,
733 FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK);
734 if (res < 0) {
735 if (res == -EAGAIN || res == -EINVAL) {
736 /*
737 * Should only get EAGAIN on kernels with
738 * broken SPLICE_F_NONBLOCK support (<=
739 * 2.6.35) where this error or a short read is
740 * returned even if the pipe itself is not
741 * full
742 *
743 * EINVAL might mean that splice can't handle
744 * this combination of input and output.
745 */
746 if (res == -EAGAIN)
747 se->broken_splice_nonblock = 1;
748
749 pthread_setspecific(se->pipe_key, NULL);
750 fuse_ll_pipe_free(llp);
751 goto fallback;
752 }
753 res = -res;
754 goto clear_pipe;
755 }
756
757 if (res != 0 && res < len) {
758 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
759 void *mbuf;
760 size_t now_len = res;
761 /*
762 * For regular files a short count is either
763 * 1) due to EOF, or
764 * 2) because of broken SPLICE_F_NONBLOCK (see above)
765 *
766 * For other inputs it's possible that we overflowed
767 * the pipe because of small buffer fragments.
768 */
769
770 res = posix_memalign(&mbuf, pagesize, len);
771 if (res != 0)
772 goto clear_pipe;
773
774 mem_buf.buf[0].mem = mbuf;
775 mem_buf.off = now_len;
776 res = fuse_buf_copy(&mem_buf, buf, 0);
777 if (res > 0) {
778 char *tmpbuf;
779 size_t extra_len = res;
780 /*
781 * Trickiest case: got more data. Need to get
782 * back the data from the pipe and then fall
783 * back to regular write.
784 */
785 tmpbuf = malloc(headerlen);
786 if (tmpbuf == NULL) {
787 free(mbuf);
788 res = ENOMEM;
789 goto clear_pipe;
790 }
791 res = read_back(llp->pipe[0], tmpbuf, headerlen);
792 free(tmpbuf);
793 if (res != 0) {
794 free(mbuf);
795 goto clear_pipe;
796 }
797 res = read_back(llp->pipe[0], mbuf, now_len);
798 if (res != 0) {
799 free(mbuf);
800 goto clear_pipe;
801 }
802 len = now_len + extra_len;
803 iov[iov_count].iov_base = mbuf;
804 iov[iov_count].iov_len = len;
805 iov_count++;
806 res = fuse_send_msg(se, ch, iov, iov_count);
807 free(mbuf);
808 return res;
809 }
810 free(mbuf);
811 res = now_len;
812 }
813 len = res;
814 out->len = headerlen + len;
815
816 if (se->debug) {
817 fuse_log(FUSE_LOG_DEBUG,
818 " unique: %llu, success, outsize: %i (splice)\n",
819 (unsigned long long) out->unique, out->len);
820 }
821
822 splice_flags = 0;
823 if ((flags & FUSE_BUF_SPLICE_MOVE) &&
824 (se->conn.want & FUSE_CAP_SPLICE_MOVE))
825 splice_flags |= SPLICE_F_MOVE;
826
827 if (se->io != NULL && se->io->splice_send != NULL) {
828 res = se->io->splice_send(llp->pipe[0], NULL,
829 ch ? ch->fd : se->fd, NULL, out->len,
830 splice_flags, se->userdata);
831 } else {
832 res = splice(llp->pipe[0], NULL, ch ? ch->fd : se->fd, NULL,
833 out->len, splice_flags);
834 }
835 if (res == -1) {
836 res = -errno;
837 perror("fuse: splice from pipe");
838 goto clear_pipe;
839 }
840 if (res != out->len) {
841 res = -EIO;
842 fuse_log(FUSE_LOG_ERR, "fuse: short splice from pipe: %u/%u\n",
843 res, out->len);
844 goto clear_pipe;
845 }
846 return 0;
847
848 clear_pipe:
849 fuse_ll_clear_pipe(se);
850 return res;
851
852 fallback:
853 return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
854 }
855 #else
856 static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
857 struct iovec *iov, int iov_count,
858 struct fuse_bufvec *buf, unsigned int flags)
859 {
860 size_t len = fuse_buf_size(buf);
861 (void) flags;
862
863 return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
864 }
865 #endif
866
867 int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv,
868 enum fuse_buf_copy_flags flags)
869 {
870 struct iovec iov[2];
871 struct fuse_out_header out;
872 int res;
873
874 iov[0].iov_base = &out;
875 iov[0].iov_len = sizeof(struct fuse_out_header);
876
877 out.unique = req->unique;
878 out.error = 0;
879
880 res = fuse_send_data_iov(req->se, req->ch, iov, 1, bufv, flags);
881 if (res <= 0) {
882 fuse_free_req(req);
883 return res;
884 } else {
885 return fuse_reply_err(req, res);
886 }
887 }
888
889 int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
890 {
891 struct fuse_statfs_out arg;
892 size_t size = req->se->conn.proto_minor < 4 ?
893 FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
894
895 memset(&arg, 0, sizeof(arg));
896 convert_statfs(stbuf, &arg.st);
897
898 return send_reply_ok(req, &arg, size);
899 }
900
901 int fuse_reply_xattr(fuse_req_t req, size_t count)
902 {
903 struct fuse_getxattr_out arg;
904
905 memset(&arg, 0, sizeof(arg));
906 arg.size = count;
907
908 return send_reply_ok(req, &arg, sizeof(arg));
909 }
910
911 int fuse_reply_lock(fuse_req_t req, const struct flock *lock)
912 {
913 struct fuse_lk_out arg;
914
915 memset(&arg, 0, sizeof(arg));
916 arg.lk.type = lock->l_type;
917 if (lock->l_type != F_UNLCK) {
918 arg.lk.start = lock->l_start;
919 if (lock->l_len == 0)
920 arg.lk.end = OFFSET_MAX;
921 else
922 arg.lk.end = lock->l_start + lock->l_len - 1;
923 }
924 arg.lk.pid = lock->l_pid;
925 return send_reply_ok(req, &arg, sizeof(arg));
926 }
927
928 int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
929 {
930 struct fuse_bmap_out arg;
931
932 memset(&arg, 0, sizeof(arg));
933 arg.block = idx;
934
935 return send_reply_ok(req, &arg, sizeof(arg));
936 }
937
938 static struct fuse_ioctl_iovec *fuse_ioctl_iovec_copy(const struct iovec *iov,
939 size_t count)
940 {
941 struct fuse_ioctl_iovec *fiov;
942 size_t i;
943
944 fiov = malloc(sizeof(fiov[0]) * count);
945 if (!fiov)
946 return NULL;
947
948 for (i = 0; i < count; i++) {
949 fiov[i].base = (uintptr_t) iov[i].iov_base;
950 fiov[i].len = iov[i].iov_len;
951 }
952
953 return fiov;
954 }
955
956 int fuse_reply_ioctl_retry(fuse_req_t req,
957 const struct iovec *in_iov, size_t in_count,
958 const struct iovec *out_iov, size_t out_count)
959 {
960 struct fuse_ioctl_out arg;
961 struct fuse_ioctl_iovec *in_fiov = NULL;
962 struct fuse_ioctl_iovec *out_fiov = NULL;
963 struct iovec iov[4];
964 size_t count = 1;
965 int res;
966
967 memset(&arg, 0, sizeof(arg));
968 arg.flags |= FUSE_IOCTL_RETRY;
969 arg.in_iovs = in_count;
970 arg.out_iovs = out_count;
971 iov[count].iov_base = &arg;
972 iov[count].iov_len = sizeof(arg);
973 count++;
974
975 if (req->se->conn.proto_minor < 16) {
976 if (in_count) {
977 iov[count].iov_base = (void *)in_iov;
978 iov[count].iov_len = sizeof(in_iov[0]) * in_count;
979 count++;
980 }
981
982 if (out_count) {
983 iov[count].iov_base = (void *)out_iov;
984 iov[count].iov_len = sizeof(out_iov[0]) * out_count;
985 count++;
986 }
987 } else {
988 /* Can't handle non-compat 64bit ioctls on 32bit */
989 if (sizeof(void *) == 4 && req->ioctl_64bit) {
990 res = fuse_reply_err(req, EINVAL);
991 goto out;
992 }
993
994 if (in_count) {
995 in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
996 if (!in_fiov)
997 goto enomem;
998
999 iov[count].iov_base = (void *)in_fiov;
1000 iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
1001 count++;
1002 }
1003 if (out_count) {
1004 out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
1005 if (!out_fiov)
1006 goto enomem;
1007
1008 iov[count].iov_base = (void *)out_fiov;
1009 iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
1010 count++;
1011 }
1012 }
1013
1014 res = send_reply_iov(req, 0, iov, count);
1015 out:
1016 free(in_fiov);
1017 free(out_fiov);
1018
1019 return res;
1020
1021 enomem:
1022 res = fuse_reply_err(req, ENOMEM);
1023 goto out;
1024 }
1025
1026 int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
1027 {
1028 struct fuse_ioctl_out arg;
1029 struct iovec iov[3];
1030 size_t count = 1;
1031
1032 memset(&arg, 0, sizeof(arg));
1033 arg.result = result;
1034 iov[count].iov_base = &arg;
1035 iov[count].iov_len = sizeof(arg);
1036 count++;
1037
1038 if (size) {
1039 iov[count].iov_base = (char *) buf;
1040 iov[count].iov_len = size;
1041 count++;
1042 }
1043
1044 return send_reply_iov(req, 0, iov, count);
1045 }
1046
1047 int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
1048 int count)
1049 {
1050 struct iovec *padded_iov;
1051 struct fuse_ioctl_out arg;
1052 int res;
1053
1054 padded_iov = malloc((count + 2) * sizeof(struct iovec));
1055 if (padded_iov == NULL)
1056 return fuse_reply_err(req, ENOMEM);
1057
1058 memset(&arg, 0, sizeof(arg));
1059 arg.result = result;
1060 padded_iov[1].iov_base = &arg;
1061 padded_iov[1].iov_len = sizeof(arg);
1062
1063 memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
1064
1065 res = send_reply_iov(req, 0, padded_iov, count + 2);
1066 free(padded_iov);
1067
1068 return res;
1069 }
1070
1071 int fuse_reply_poll(fuse_req_t req, unsigned revents)
1072 {
1073 struct fuse_poll_out arg;
1074
1075 memset(&arg, 0, sizeof(arg));
1076 arg.revents = revents;
1077
1078 return send_reply_ok(req, &arg, sizeof(arg));
1079 }
1080
1081 int fuse_reply_lseek(fuse_req_t req, off_t off)
1082 {
1083 struct fuse_lseek_out arg;
1084
1085 memset(&arg, 0, sizeof(arg));
1086 arg.offset = off;
1087
1088 return send_reply_ok(req, &arg, sizeof(arg));
1089 }
1090
1091 static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1092 {
1093 char *name = (char *) inarg;
1094
1095 if (req->se->op.lookup)
1096 req->se->op.lookup(req, nodeid, name);
1097 else
1098 fuse_reply_err(req, ENOSYS);
1099 }
1100
1101 static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1102 {
1103 struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;
1104
1105 if (req->se->op.forget)
1106 req->se->op.forget(req, nodeid, arg->nlookup);
1107 else
1108 fuse_reply_none(req);
1109 }
1110
1111 static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid,
1112 const void *inarg)
1113 {
1114 struct fuse_batch_forget_in *arg = (void *) inarg;
1115 struct fuse_forget_one *param = (void *) PARAM(arg);
1116 unsigned int i;
1117
1118 (void) nodeid;
1119
1120 if (req->se->op.forget_multi) {
1121 req->se->op.forget_multi(req, arg->count,
1122 (struct fuse_forget_data *) param);
1123 } else if (req->se->op.forget) {
1124 for (i = 0; i < arg->count; i++) {
1125 struct fuse_forget_one *forget = &param[i];
1126 struct fuse_req *dummy_req;
1127
1128 dummy_req = fuse_ll_alloc_req(req->se);
1129 if (dummy_req == NULL)
1130 break;
1131
1132 dummy_req->unique = req->unique;
1133 dummy_req->ctx = req->ctx;
1134 dummy_req->ch = NULL;
1135
1136 req->se->op.forget(dummy_req, forget->nodeid,
1137 forget->nlookup);
1138 }
1139 fuse_reply_none(req);
1140 } else {
1141 fuse_reply_none(req);
1142 }
1143 }
1144
1145 static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1146 {
1147 struct fuse_file_info *fip = NULL;
1148 struct fuse_file_info fi;
1149
1150 if (req->se->conn.proto_minor >= 9) {
1151 struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;
1152
1153 if (arg->getattr_flags & FUSE_GETATTR_FH) {
1154 memset(&fi, 0, sizeof(fi));
1155 fi.fh = arg->fh;
1156 fip = &fi;
1157 }
1158 }
1159
1160 if (req->se->op.getattr)
1161 req->se->op.getattr(req, nodeid, fip);
1162 else
1163 fuse_reply_err(req, ENOSYS);
1164 }
1165
1166 static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1167 {
1168 struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;
1169
1170 if (req->se->op.setattr) {
1171 struct fuse_file_info *fi = NULL;
1172 struct fuse_file_info fi_store;
1173 struct stat stbuf;
1174 memset(&stbuf, 0, sizeof(stbuf));
1175 convert_attr(arg, &stbuf);
1176 if (arg->valid & FATTR_FH) {
1177 arg->valid &= ~FATTR_FH;
1178 memset(&fi_store, 0, sizeof(fi_store));
1179 fi = &fi_store;
1180 fi->fh = arg->fh;
1181 }
1182 arg->valid &=
1183 FUSE_SET_ATTR_MODE |
1184 FUSE_SET_ATTR_UID |
1185 FUSE_SET_ATTR_GID |
1186 FUSE_SET_ATTR_SIZE |
1187 FUSE_SET_ATTR_ATIME |
1188 FUSE_SET_ATTR_MTIME |
1189 FUSE_SET_ATTR_KILL_SUID |
1190 FUSE_SET_ATTR_KILL_SGID |
1191 FUSE_SET_ATTR_ATIME_NOW |
1192 FUSE_SET_ATTR_MTIME_NOW |
1193 FUSE_SET_ATTR_CTIME;
1194
1195 req->se->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
1196 } else
1197 fuse_reply_err(req, ENOSYS);
1198 }
1199
1200 static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1201 {
1202 struct fuse_access_in *arg = (struct fuse_access_in *) inarg;
1203
1204 if (req->se->op.access)
1205 req->se->op.access(req, nodeid, arg->mask);
1206 else
1207 fuse_reply_err(req, ENOSYS);
1208 }
1209
1210 static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1211 {
1212 (void) inarg;
1213
1214 if (req->se->op.readlink)
1215 req->se->op.readlink(req, nodeid);
1216 else
1217 fuse_reply_err(req, ENOSYS);
1218 }
1219
1220 static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1221 {
1222 struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
1223 char *name = PARAM(arg);
1224
1225 if (req->se->conn.proto_minor >= 12)
1226 req->ctx.umask = arg->umask;
1227 else
1228 name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
1229
1230 if (req->se->op.mknod)
1231 req->se->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
1232 else
1233 fuse_reply_err(req, ENOSYS);
1234 }
1235
1236 static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1237 {
1238 struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;
1239
1240 if (req->se->conn.proto_minor >= 12)
1241 req->ctx.umask = arg->umask;
1242
1243 if (req->se->op.mkdir)
1244 req->se->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
1245 else
1246 fuse_reply_err(req, ENOSYS);
1247 }
1248
1249 static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1250 {
1251 char *name = (char *) inarg;
1252
1253 if (req->se->op.unlink)
1254 req->se->op.unlink(req, nodeid, name);
1255 else
1256 fuse_reply_err(req, ENOSYS);
1257 }
1258
1259 static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1260 {
1261 char *name = (char *) inarg;
1262
1263 if (req->se->op.rmdir)
1264 req->se->op.rmdir(req, nodeid, name);
1265 else
1266 fuse_reply_err(req, ENOSYS);
1267 }
1268
1269 static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1270 {
1271 char *name = (char *) inarg;
1272 char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;
1273
1274 if (req->se->op.symlink)
1275 req->se->op.symlink(req, linkname, nodeid, name);
1276 else
1277 fuse_reply_err(req, ENOSYS);
1278 }
1279
1280 static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1281 {
1282 struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
1283 char *oldname = PARAM(arg);
1284 char *newname = oldname + strlen(oldname) + 1;
1285
1286 if (req->se->op.rename)
1287 req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
1288 0);
1289 else
1290 fuse_reply_err(req, ENOSYS);
1291 }
1292
1293 static void do_rename2(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1294 {
1295 struct fuse_rename2_in *arg = (struct fuse_rename2_in *) inarg;
1296 char *oldname = PARAM(arg);
1297 char *newname = oldname + strlen(oldname) + 1;
1298
1299 if (req->se->op.rename)
1300 req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
1301 arg->flags);
1302 else
1303 fuse_reply_err(req, ENOSYS);
1304 }
1305
1306 static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1307 {
1308 struct fuse_link_in *arg = (struct fuse_link_in *) inarg;
1309
1310 if (req->se->op.link)
1311 req->se->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
1312 else
1313 fuse_reply_err(req, ENOSYS);
1314 }
1315
1316 static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1317 {
1318 struct fuse_create_in *arg = (struct fuse_create_in *) inarg;
1319
1320 if (req->se->op.create) {
1321 struct fuse_file_info fi;
1322 char *name = PARAM(arg);
1323
1324 memset(&fi, 0, sizeof(fi));
1325 fi.flags = arg->flags;
1326
1327 if (req->se->conn.proto_minor >= 12)
1328 req->ctx.umask = arg->umask;
1329 else
1330 name = (char *) inarg + sizeof(struct fuse_open_in);
1331
1332 req->se->op.create(req, nodeid, name, arg->mode, &fi);
1333 } else
1334 fuse_reply_err(req, ENOSYS);
1335 }
1336
1337 static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1338 {
1339 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1340 struct fuse_file_info fi;
1341
1342 memset(&fi, 0, sizeof(fi));
1343 fi.flags = arg->flags;
1344
1345 if (req->se->op.open)
1346 req->se->op.open(req, nodeid, &fi);
1347 else
1348 fuse_reply_open(req, &fi);
1349 }
1350
1351 static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1352 {
1353 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1354
1355 if (req->se->op.read) {
1356 struct fuse_file_info fi;
1357
1358 memset(&fi, 0, sizeof(fi));
1359 fi.fh = arg->fh;
1360 if (req->se->conn.proto_minor >= 9) {
1361 fi.lock_owner = arg->lock_owner;
1362 fi.flags = arg->flags;
1363 }
1364 req->se->op.read(req, nodeid, arg->size, arg->offset, &fi);
1365 } else
1366 fuse_reply_err(req, ENOSYS);
1367 }
1368
1369 static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1370 {
1371 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1372 struct fuse_file_info fi;
1373 char *param;
1374
1375 memset(&fi, 0, sizeof(fi));
1376 fi.fh = arg->fh;
1377 fi.writepage = (arg->write_flags & FUSE_WRITE_CACHE) != 0;
1378
1379 if (req->se->conn.proto_minor < 9) {
1380 param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1381 } else {
1382 fi.lock_owner = arg->lock_owner;
1383 fi.flags = arg->flags;
1384 param = PARAM(arg);
1385 }
1386
1387 if (req->se->op.write)
1388 req->se->op.write(req, nodeid, param, arg->size,
1389 arg->offset, &fi);
1390 else
1391 fuse_reply_err(req, ENOSYS);
1392 }
1393
1394 static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
1395 const struct fuse_buf *ibuf)
1396 {
1397 struct fuse_session *se = req->se;
1398 struct fuse_bufvec bufv = {
1399 .buf[0] = *ibuf,
1400 .count = 1,
1401 };
1402 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1403 struct fuse_file_info fi;
1404
1405 memset(&fi, 0, sizeof(fi));
1406 fi.fh = arg->fh;
1407 fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;
1408
1409 if (se->conn.proto_minor < 9) {
1410 bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1411 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1412 FUSE_COMPAT_WRITE_IN_SIZE;
1413 assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD));
1414 } else {
1415 fi.lock_owner = arg->lock_owner;
1416 fi.flags = arg->flags;
1417 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
1418 bufv.buf[0].mem = PARAM(arg);
1419
1420 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1421 sizeof(struct fuse_write_in);
1422 }
1423 if (bufv.buf[0].size < arg->size) {
1424 fuse_log(FUSE_LOG_ERR, "fuse: do_write_buf: buffer size too small\n");
1425 fuse_reply_err(req, EIO);
1426 goto out;
1427 }
1428 bufv.buf[0].size = arg->size;
1429
1430 se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
1431
1432 out:
1433 /* Need to reset the pipe if ->write_buf() didn't consume all data */
1434 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
1435 fuse_ll_clear_pipe(se);
1436 }
1437
1438 static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1439 {
1440 struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
1441 struct fuse_file_info fi;
1442
1443 memset(&fi, 0, sizeof(fi));
1444 fi.fh = arg->fh;
1445 fi.flush = 1;
1446 if (req->se->conn.proto_minor >= 7)
1447 fi.lock_owner = arg->lock_owner;
1448
1449 if (req->se->op.flush)
1450 req->se->op.flush(req, nodeid, &fi);
1451 else
1452 fuse_reply_err(req, ENOSYS);
1453 }
1454
1455 static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1456 {
1457 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1458 struct fuse_file_info fi;
1459
1460 memset(&fi, 0, sizeof(fi));
1461 fi.flags = arg->flags;
1462 fi.fh = arg->fh;
1463 if (req->se->conn.proto_minor >= 8) {
1464 fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
1465 fi.lock_owner = arg->lock_owner;
1466 }
1467 if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) {
1468 fi.flock_release = 1;
1469 fi.lock_owner = arg->lock_owner;
1470 }
1471
1472 if (req->se->op.release)
1473 req->se->op.release(req, nodeid, &fi);
1474 else
1475 fuse_reply_err(req, 0);
1476 }
1477
1478 static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1479 {
1480 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1481 struct fuse_file_info fi;
1482 int datasync = arg->fsync_flags & 1;
1483
1484 memset(&fi, 0, sizeof(fi));
1485 fi.fh = arg->fh;
1486
1487 if (req->se->op.fsync)
1488 req->se->op.fsync(req, nodeid, datasync, &fi);
1489 else
1490 fuse_reply_err(req, ENOSYS);
1491 }
1492
1493 static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1494 {
1495 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1496 struct fuse_file_info fi;
1497
1498 memset(&fi, 0, sizeof(fi));
1499 fi.flags = arg->flags;
1500
1501 if (req->se->op.opendir)
1502 req->se->op.opendir(req, nodeid, &fi);
1503 else
1504 fuse_reply_open(req, &fi);
1505 }
1506
1507 static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1508 {
1509 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1510 struct fuse_file_info fi;
1511
1512 memset(&fi, 0, sizeof(fi));
1513 fi.fh = arg->fh;
1514
1515 if (req->se->op.readdir)
1516 req->se->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
1517 else
1518 fuse_reply_err(req, ENOSYS);
1519 }
1520
1521 static void do_readdirplus(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1522 {
1523 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1524 struct fuse_file_info fi;
1525
1526 memset(&fi, 0, sizeof(fi));
1527 fi.fh = arg->fh;
1528
1529 if (req->se->op.readdirplus)
1530 req->se->op.readdirplus(req, nodeid, arg->size, arg->offset, &fi);
1531 else
1532 fuse_reply_err(req, ENOSYS);
1533 }
1534
1535 static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1536 {
1537 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1538 struct fuse_file_info fi;
1539
1540 memset(&fi, 0, sizeof(fi));
1541 fi.flags = arg->flags;
1542 fi.fh = arg->fh;
1543
1544 if (req->se->op.releasedir)
1545 req->se->op.releasedir(req, nodeid, &fi);
1546 else
1547 fuse_reply_err(req, 0);
1548 }
1549
1550 static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1551 {
1552 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1553 struct fuse_file_info fi;
1554 int datasync = arg->fsync_flags & 1;
1555
1556 memset(&fi, 0, sizeof(fi));
1557 fi.fh = arg->fh;
1558
1559 if (req->se->op.fsyncdir)
1560 req->se->op.fsyncdir(req, nodeid, datasync, &fi);
1561 else
1562 fuse_reply_err(req, ENOSYS);
1563 }
1564
1565 static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1566 {
1567 (void) nodeid;
1568 (void) inarg;
1569
1570 if (req->se->op.statfs)
1571 req->se->op.statfs(req, nodeid);
1572 else {
1573 struct statvfs buf = {
1574 .f_namemax = 255,
1575 .f_bsize = 512,
1576 };
1577 fuse_reply_statfs(req, &buf);
1578 }
1579 }
1580
1581 static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1582 {
1583 struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
1584 char *name = PARAM(arg);
1585 char *value = name + strlen(name) + 1;
1586
1587 if (req->se->op.setxattr)
1588 req->se->op.setxattr(req, nodeid, name, value, arg->size,
1589 arg->flags);
1590 else
1591 fuse_reply_err(req, ENOSYS);
1592 }
1593
1594 static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1595 {
1596 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1597
1598 if (req->se->op.getxattr)
1599 req->se->op.getxattr(req, nodeid, PARAM(arg), arg->size);
1600 else
1601 fuse_reply_err(req, ENOSYS);
1602 }
1603
1604 static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1605 {
1606 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1607
1608 if (req->se->op.listxattr)
1609 req->se->op.listxattr(req, nodeid, arg->size);
1610 else
1611 fuse_reply_err(req, ENOSYS);
1612 }
1613
1614 static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1615 {
1616 char *name = (char *) inarg;
1617
1618 if (req->se->op.removexattr)
1619 req->se->op.removexattr(req, nodeid, name);
1620 else
1621 fuse_reply_err(req, ENOSYS);
1622 }
1623
1624 static void convert_fuse_file_lock(struct fuse_file_lock *fl,
1625 struct flock *flock)
1626 {
1627 memset(flock, 0, sizeof(struct flock));
1628 flock->l_type = fl->type;
1629 flock->l_whence = SEEK_SET;
1630 flock->l_start = fl->start;
1631 if (fl->end == OFFSET_MAX)
1632 flock->l_len = 0;
1633 else
1634 flock->l_len = fl->end - fl->start + 1;
1635 flock->l_pid = fl->pid;
1636 }
1637
1638 static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1639 {
1640 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1641 struct fuse_file_info fi;
1642 struct flock flock;
1643
1644 memset(&fi, 0, sizeof(fi));
1645 fi.fh = arg->fh;
1646 fi.lock_owner = arg->owner;
1647
1648 convert_fuse_file_lock(&arg->lk, &flock);
1649 if (req->se->op.getlk)
1650 req->se->op.getlk(req, nodeid, &fi, &flock);
1651 else
1652 fuse_reply_err(req, ENOSYS);
1653 }
1654
1655 static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
1656 const void *inarg, int sleep)
1657 {
1658 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1659 struct fuse_file_info fi;
1660 struct flock flock;
1661
1662 memset(&fi, 0, sizeof(fi));
1663 fi.fh = arg->fh;
1664 fi.lock_owner = arg->owner;
1665
1666 if (arg->lk_flags & FUSE_LK_FLOCK) {
1667 int op = 0;
1668
1669 switch (arg->lk.type) {
1670 case F_RDLCK:
1671 op = LOCK_SH;
1672 break;
1673 case F_WRLCK:
1674 op = LOCK_EX;
1675 break;
1676 case F_UNLCK:
1677 op = LOCK_UN;
1678 break;
1679 }
1680 if (!sleep)
1681 op |= LOCK_NB;
1682
1683 if (req->se->op.flock)
1684 req->se->op.flock(req, nodeid, &fi, op);
1685 else
1686 fuse_reply_err(req, ENOSYS);
1687 } else {
1688 convert_fuse_file_lock(&arg->lk, &flock);
1689 if (req->se->op.setlk)
1690 req->se->op.setlk(req, nodeid, &fi, &flock, sleep);
1691 else
1692 fuse_reply_err(req, ENOSYS);
1693 }
1694 }
1695
1696 static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1697 {
1698 do_setlk_common(req, nodeid, inarg, 0);
1699 }
1700
1701 static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1702 {
1703 do_setlk_common(req, nodeid, inarg, 1);
1704 }
1705
1706 static int find_interrupted(struct fuse_session *se, struct fuse_req *req)
1707 {
1708 struct fuse_req *curr;
1709
1710 for (curr = se->list.next; curr != &se->list; curr = curr->next) {
1711 if (curr->unique == req->u.i.unique) {
1712 fuse_interrupt_func_t func;
1713 void *data;
1714
1715 curr->ctr++;
1716 pthread_mutex_unlock(&se->lock);
1717
1718 /* Ugh, ugly locking */
1719 pthread_mutex_lock(&curr->lock);
1720 pthread_mutex_lock(&se->lock);
1721 curr->interrupted = 1;
1722 func = curr->u.ni.func;
1723 data = curr->u.ni.data;
1724 pthread_mutex_unlock(&se->lock);
1725 if (func)
1726 func(curr, data);
1727 pthread_mutex_unlock(&curr->lock);
1728
1729 pthread_mutex_lock(&se->lock);
1730 curr->ctr--;
1731 if (!curr->ctr) {
1732 fuse_chan_put(req->ch);
1733 req->ch = NULL;
1734 destroy_req(curr);
1735 }
1736
1737 return 1;
1738 }
1739 }
1740 for (curr = se->interrupts.next; curr != &se->interrupts;
1741 curr = curr->next) {
1742 if (curr->u.i.unique == req->u.i.unique)
1743 return 1;
1744 }
1745 return 0;
1746 }
1747
1748 static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1749 {
1750 struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
1751 struct fuse_session *se = req->se;
1752
1753 (void) nodeid;
1754 if (se->debug)
1755 fuse_log(FUSE_LOG_DEBUG, "INTERRUPT: %llu\n",
1756 (unsigned long long) arg->unique);
1757
1758 req->u.i.unique = arg->unique;
1759
1760 pthread_mutex_lock(&se->lock);
1761 if (find_interrupted(se, req)) {
1762 fuse_chan_put(req->ch);
1763 req->ch = NULL;
1764 destroy_req(req);
1765 } else
1766 list_add_req(req, &se->interrupts);
1767 pthread_mutex_unlock(&se->lock);
1768 }
1769
1770 static struct fuse_req *check_interrupt(struct fuse_session *se,
1771 struct fuse_req *req)
1772 {
1773 struct fuse_req *curr;
1774
1775 for (curr = se->interrupts.next; curr != &se->interrupts;
1776 curr = curr->next) {
1777 if (curr->u.i.unique == req->unique) {
1778 req->interrupted = 1;
1779 list_del_req(curr);
1780 fuse_chan_put(curr->ch);
1781 curr->ch = NULL;
1782 destroy_req(curr);
1783 return NULL;
1784 }
1785 }
1786 curr = se->interrupts.next;
1787 if (curr != &se->interrupts) {
1788 list_del_req(curr);
1789 list_init_req(curr);
1790 return curr;
1791 } else
1792 return NULL;
1793 }
1794
1795 static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1796 {
1797 struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;
1798
1799 if (req->se->op.bmap)
1800 req->se->op.bmap(req, nodeid, arg->blocksize, arg->block);
1801 else
1802 fuse_reply_err(req, ENOSYS);
1803 }
1804
1805 static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1806 {
1807 struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
1808 unsigned int flags = arg->flags;
1809 void *in_buf = arg->in_size ? PARAM(arg) : NULL;
1810 struct fuse_file_info fi;
1811
1812 if (flags & FUSE_IOCTL_DIR &&
1813 !(req->se->conn.want & FUSE_CAP_IOCTL_DIR)) {
1814 fuse_reply_err(req, ENOTTY);
1815 return;
1816 }
1817
1818 memset(&fi, 0, sizeof(fi));
1819 fi.fh = arg->fh;
1820
1821 if (sizeof(void *) == 4 && req->se->conn.proto_minor >= 16 &&
1822 !(flags & FUSE_IOCTL_32BIT)) {
1823 req->ioctl_64bit = 1;
1824 }
1825
1826 if (req->se->op.ioctl)
1827 req->se->op.ioctl(req, nodeid, arg->cmd,
1828 (void *)(uintptr_t)arg->arg, &fi, flags,
1829 in_buf, arg->in_size, arg->out_size);
1830 else
1831 fuse_reply_err(req, ENOSYS);
1832 }
1833
1834 void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
1835 {
1836 free(ph);
1837 }
1838
1839 static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1840 {
1841 struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
1842 struct fuse_file_info fi;
1843
1844 memset(&fi, 0, sizeof(fi));
1845 fi.fh = arg->fh;
1846 fi.poll_events = arg->events;
1847
1848 if (req->se->op.poll) {
1849 struct fuse_pollhandle *ph = NULL;
1850
1851 if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
1852 ph = malloc(sizeof(struct fuse_pollhandle));
1853 if (ph == NULL) {
1854 fuse_reply_err(req, ENOMEM);
1855 return;
1856 }
1857 ph->kh = arg->kh;
1858 ph->se = req->se;
1859 }
1860
1861 req->se->op.poll(req, nodeid, &fi, ph);
1862 } else {
1863 fuse_reply_err(req, ENOSYS);
1864 }
1865 }
1866
1867 static void do_fallocate(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1868 {
1869 struct fuse_fallocate_in *arg = (struct fuse_fallocate_in *) inarg;
1870 struct fuse_file_info fi;
1871
1872 memset(&fi, 0, sizeof(fi));
1873 fi.fh = arg->fh;
1874
1875 if (req->se->op.fallocate)
1876 req->se->op.fallocate(req, nodeid, arg->mode, arg->offset, arg->length, &fi);
1877 else
1878 fuse_reply_err(req, ENOSYS);
1879 }
1880
1881 static void do_copy_file_range(fuse_req_t req, fuse_ino_t nodeid_in, const void *inarg)
1882 {
1883 struct fuse_copy_file_range_in *arg = (struct fuse_copy_file_range_in *) inarg;
1884 struct fuse_file_info fi_in, fi_out;
1885
1886 memset(&fi_in, 0, sizeof(fi_in));
1887 fi_in.fh = arg->fh_in;
1888
1889 memset(&fi_out, 0, sizeof(fi_out));
1890 fi_out.fh = arg->fh_out;
1891
1892
1893 if (req->se->op.copy_file_range)
1894 req->se->op.copy_file_range(req, nodeid_in, arg->off_in,
1895 &fi_in, arg->nodeid_out,
1896 arg->off_out, &fi_out, arg->len,
1897 arg->flags);
1898 else
1899 fuse_reply_err(req, ENOSYS);
1900 }
1901
1902 static void do_lseek(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1903 {
1904 struct fuse_lseek_in *arg = (struct fuse_lseek_in *) inarg;
1905 struct fuse_file_info fi;
1906
1907 memset(&fi, 0, sizeof(fi));
1908 fi.fh = arg->fh;
1909
1910 if (req->se->op.lseek)
1911 req->se->op.lseek(req, nodeid, arg->offset, arg->whence, &fi);
1912 else
1913 fuse_reply_err(req, ENOSYS);
1914 }
1915
1916 /* Prevent bogus data races (bogus since "init" is called before
1917 * multi-threading becomes relevant */
1918 static __attribute__((no_sanitize("thread")))
1919 void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1920 {
1921 struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
1922 struct fuse_init_out outarg;
1923 struct fuse_session *se = req->se;
1924 size_t bufsize = se->bufsize;
1925 size_t outargsize = sizeof(outarg);
1926 uint64_t inargflags = 0;
1927 uint64_t outargflags = 0;
1928 (void) nodeid;
1929 if (se->debug) {
1930 fuse_log(FUSE_LOG_DEBUG, "INIT: %u.%u\n", arg->major, arg->minor);
1931 if (arg->major == 7 && arg->minor >= 6) {
1932 fuse_log(FUSE_LOG_DEBUG, "flags=0x%08x\n", arg->flags);
1933 fuse_log(FUSE_LOG_DEBUG, "max_readahead=0x%08x\n",
1934 arg->max_readahead);
1935 }
1936 }
1937 se->conn.proto_major = arg->major;
1938 se->conn.proto_minor = arg->minor;
1939 se->conn.capable = 0;
1940 se->conn.want = 0;
1941
1942 memset(&outarg, 0, sizeof(outarg));
1943 outarg.major = FUSE_KERNEL_VERSION;
1944 outarg.minor = FUSE_KERNEL_MINOR_VERSION;
1945
1946 if (arg->major < 7) {
1947 fuse_log(FUSE_LOG_ERR, "fuse: unsupported protocol version: %u.%u\n",
1948 arg->major, arg->minor);
1949 fuse_reply_err(req, EPROTO);
1950 return;
1951 }
1952
1953 if (arg->major > 7) {
1954 /* Wait for a second INIT request with a 7.X version */
1955 send_reply_ok(req, &outarg, sizeof(outarg));
1956 return;
1957 }
1958
1959 if (arg->minor >= 6) {
1960 if (arg->max_readahead < se->conn.max_readahead)
1961 se->conn.max_readahead = arg->max_readahead;
1962 inargflags = arg->flags;
1963 if (inargflags & FUSE_INIT_EXT)
1964 inargflags = inargflags | (uint64_t) arg->flags2 << 32;
1965 if (inargflags & FUSE_ASYNC_READ)
1966 se->conn.capable |= FUSE_CAP_ASYNC_READ;
1967 if (inargflags & FUSE_POSIX_LOCKS)
1968 se->conn.capable |= FUSE_CAP_POSIX_LOCKS;
1969 if (inargflags & FUSE_ATOMIC_O_TRUNC)
1970 se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
1971 if (inargflags & FUSE_EXPORT_SUPPORT)
1972 se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
1973 if (inargflags & FUSE_DONT_MASK)
1974 se->conn.capable |= FUSE_CAP_DONT_MASK;
1975 if (inargflags & FUSE_FLOCK_LOCKS)
1976 se->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
1977 if (inargflags & FUSE_AUTO_INVAL_DATA)
1978 se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA;
1979 if (inargflags & FUSE_DO_READDIRPLUS)
1980 se->conn.capable |= FUSE_CAP_READDIRPLUS;
1981 if (inargflags & FUSE_READDIRPLUS_AUTO)
1982 se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO;
1983 if (inargflags & FUSE_ASYNC_DIO)
1984 se->conn.capable |= FUSE_CAP_ASYNC_DIO;
1985 if (inargflags & FUSE_WRITEBACK_CACHE)
1986 se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE;
1987 if (inargflags & FUSE_NO_OPEN_SUPPORT)
1988 se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT;
1989 if (inargflags & FUSE_PARALLEL_DIROPS)
1990 se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS;
1991 if (inargflags & FUSE_POSIX_ACL)
1992 se->conn.capable |= FUSE_CAP_POSIX_ACL;
1993 if (inargflags & FUSE_HANDLE_KILLPRIV)
1994 se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV;
1995 if (inargflags & FUSE_CACHE_SYMLINKS)
1996 se->conn.capable |= FUSE_CAP_CACHE_SYMLINKS;
1997 if (inargflags & FUSE_NO_OPENDIR_SUPPORT)
1998 se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT;
1999 if (inargflags & FUSE_EXPLICIT_INVAL_DATA)
2000 se->conn.capable |= FUSE_CAP_EXPLICIT_INVAL_DATA;
2001 if (!(inargflags & FUSE_MAX_PAGES)) {
2002 size_t max_bufsize =
2003 FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize()
2004 + FUSE_BUFFER_HEADER_SIZE;
2005 if (bufsize > max_bufsize) {
2006 bufsize = max_bufsize;
2007 }
2008 }
2009 if (arg->minor >= 38)
2010 se->conn.capable |= FUSE_CAP_EXPIRE_ONLY;
2011 } else {
2012 se->conn.max_readahead = 0;
2013 }
2014
2015 if (se->conn.proto_minor >= 14) {
2016 #ifdef HAVE_SPLICE
2017 #ifdef HAVE_VMSPLICE
2018 if ((se->io == NULL) || (se->io->splice_send != NULL)) {
2019 se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
2020 }
2021 #endif
2022 if ((se->io == NULL) || (se->io->splice_receive != NULL)) {
2023 se->conn.capable |= FUSE_CAP_SPLICE_READ;
2024 }
2025 #endif
2026 }
2027 if (se->conn.proto_minor >= 18)
2028 se->conn.capable |= FUSE_CAP_IOCTL_DIR;
2029
2030 /* Default settings for modern filesystems.
2031 *
2032 * Most of these capabilities were disabled by default in
2033 * libfuse2 for backwards compatibility reasons. In libfuse3,
2034 * we can finally enable them by default (as long as they're
2035 * supported by the kernel).
2036 */
2037 #define LL_SET_DEFAULT(cond, cap) \
2038 if ((cond) && (se->conn.capable & (cap))) \
2039 se->conn.want |= (cap)
2040 LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_READ);
2041 LL_SET_DEFAULT(1, FUSE_CAP_PARALLEL_DIROPS);
2042 LL_SET_DEFAULT(1, FUSE_CAP_AUTO_INVAL_DATA);
2043 LL_SET_DEFAULT(1, FUSE_CAP_HANDLE_KILLPRIV);
2044 LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_DIO);
2045 LL_SET_DEFAULT(1, FUSE_CAP_IOCTL_DIR);
2046 LL_SET_DEFAULT(1, FUSE_CAP_ATOMIC_O_TRUNC);
2047 LL_SET_DEFAULT(se->op.write_buf, FUSE_CAP_SPLICE_READ);
2048 LL_SET_DEFAULT(se->op.getlk && se->op.setlk,
2049 FUSE_CAP_POSIX_LOCKS);
2050 LL_SET_DEFAULT(se->op.flock, FUSE_CAP_FLOCK_LOCKS);
2051 LL_SET_DEFAULT(se->op.readdirplus, FUSE_CAP_READDIRPLUS);
2052 LL_SET_DEFAULT(se->op.readdirplus && se->op.readdir,
2053 FUSE_CAP_READDIRPLUS_AUTO);
2054 se->conn.time_gran = 1;
2055
2056 if (bufsize < FUSE_MIN_READ_BUFFER) {
2057 fuse_log(FUSE_LOG_ERR, "fuse: warning: buffer size too small: %zu\n",
2058 bufsize);
2059 bufsize = FUSE_MIN_READ_BUFFER;
2060 }
2061 se->bufsize = bufsize;
2062
2063 if (se->conn.max_write > bufsize - FUSE_BUFFER_HEADER_SIZE)
2064 se->conn.max_write = bufsize - FUSE_BUFFER_HEADER_SIZE;
2065
2066 se->got_init = 1;
2067 if (se->op.init)
2068 se->op.init(se->userdata, &se->conn);
2069
2070 if (se->conn.want & (~se->conn.capable)) {
2071 fuse_log(FUSE_LOG_ERR, "fuse: error: filesystem requested capabilities "
2072 "0x%x that are not supported by kernel, aborting.\n",
2073 se->conn.want & (~se->conn.capable));
2074 fuse_reply_err(req, EPROTO);
2075 se->error = -EPROTO;
2076 fuse_session_exit(se);
2077 return;
2078 }
2079
2080 unsigned max_read_mo = get_max_read(se->mo);
2081 if (se->conn.max_read != max_read_mo) {
2082 fuse_log(FUSE_LOG_ERR, "fuse: error: init() and fuse_session_new() "
2083 "requested different maximum read size (%u vs %u)\n",
2084 se->conn.max_read, max_read_mo);
2085 fuse_reply_err(req, EPROTO);
2086 se->error = -EPROTO;
2087 fuse_session_exit(se);
2088 return;
2089 }
2090
2091 if (se->conn.max_write < bufsize - FUSE_BUFFER_HEADER_SIZE) {
2092 se->bufsize = se->conn.max_write + FUSE_BUFFER_HEADER_SIZE;
2093 }
2094 if (arg->flags & FUSE_MAX_PAGES) {
2095 outarg.flags |= FUSE_MAX_PAGES;
2096 outarg.max_pages = (se->conn.max_write - 1) / getpagesize() + 1;
2097 }
2098 outargflags = outarg.flags;
2099 /* Always enable big writes, this is superseded
2100 by the max_write option */
2101 outargflags |= FUSE_BIG_WRITES;
2102
2103 if (se->conn.want & FUSE_CAP_ASYNC_READ)
2104 outargflags |= FUSE_ASYNC_READ;
2105 if (se->conn.want & FUSE_CAP_POSIX_LOCKS)
2106 outargflags |= FUSE_POSIX_LOCKS;
2107 if (se->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
2108 outargflags |= FUSE_ATOMIC_O_TRUNC;
2109 if (se->conn.want & FUSE_CAP_EXPORT_SUPPORT)
2110 outargflags |= FUSE_EXPORT_SUPPORT;
2111 if (se->conn.want & FUSE_CAP_DONT_MASK)
2112 outargflags |= FUSE_DONT_MASK;
2113 if (se->conn.want & FUSE_CAP_FLOCK_LOCKS)
2114 outargflags |= FUSE_FLOCK_LOCKS;
2115 if (se->conn.want & FUSE_CAP_AUTO_INVAL_DATA)
2116 outargflags |= FUSE_AUTO_INVAL_DATA;
2117 if (se->conn.want & FUSE_CAP_READDIRPLUS)
2118 outargflags |= FUSE_DO_READDIRPLUS;
2119 if (se->conn.want & FUSE_CAP_READDIRPLUS_AUTO)
2120 outargflags |= FUSE_READDIRPLUS_AUTO;
2121 if (se->conn.want & FUSE_CAP_ASYNC_DIO)
2122 outargflags |= FUSE_ASYNC_DIO;
2123 if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE)
2124 outargflags |= FUSE_WRITEBACK_CACHE;
2125 if (se->conn.want & FUSE_CAP_POSIX_ACL)
2126 outargflags |= FUSE_POSIX_ACL;
2127 if (se->conn.want & FUSE_CAP_CACHE_SYMLINKS)
2128 outargflags |= FUSE_CACHE_SYMLINKS;
2129 if (se->conn.want & FUSE_CAP_EXPLICIT_INVAL_DATA)
2130 outargflags |= FUSE_EXPLICIT_INVAL_DATA;
2131
2132 if (inargflags & FUSE_INIT_EXT) {
2133 outargflags |= FUSE_INIT_EXT;
2134 outarg.flags2 = outargflags >> 32;
2135 }
2136
2137 outarg.flags = outargflags;
2138
2139 outarg.max_readahead = se->conn.max_readahead;
2140 outarg.max_write = se->conn.max_write;
2141 if (se->conn.proto_minor >= 13) {
2142 if (se->conn.max_background >= (1 << 16))
2143 se->conn.max_background = (1 << 16) - 1;
2144 if (se->conn.congestion_threshold > se->conn.max_background)
2145 se->conn.congestion_threshold = se->conn.max_background;
2146 if (!se->conn.congestion_threshold) {
2147 se->conn.congestion_threshold =
2148 se->conn.max_background * 3 / 4;
2149 }
2150
2151 outarg.max_background = se->conn.max_background;
2152 outarg.congestion_threshold = se->conn.congestion_threshold;
2153 }
2154 if (se->conn.proto_minor >= 23)
2155 outarg.time_gran = se->conn.time_gran;
2156
2157 if (se->debug) {
2158 fuse_log(FUSE_LOG_DEBUG, " INIT: %u.%u\n", outarg.major, outarg.minor);
2159 fuse_log(FUSE_LOG_DEBUG, " flags=0x%08x\n", outarg.flags);
2160 fuse_log(FUSE_LOG_DEBUG, " max_readahead=0x%08x\n",
2161 outarg.max_readahead);
2162 fuse_log(FUSE_LOG_DEBUG, " max_write=0x%08x\n", outarg.max_write);
2163 fuse_log(FUSE_LOG_DEBUG, " max_background=%i\n",
2164 outarg.max_background);
2165 fuse_log(FUSE_LOG_DEBUG, " congestion_threshold=%i\n",
2166 outarg.congestion_threshold);
2167 fuse_log(FUSE_LOG_DEBUG, " time_gran=%u\n",
2168 outarg.time_gran);
2169 }
2170 if (arg->minor < 5)
2171 outargsize = FUSE_COMPAT_INIT_OUT_SIZE;
2172 else if (arg->minor < 23)
2173 outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE;
2174
2175 send_reply_ok(req, &outarg, outargsize);
2176 }
2177
2178 static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
2179 {
2180 struct fuse_session *se = req->se;
2181
2182 (void) nodeid;
2183 (void) inarg;
2184
2185 se->got_destroy = 1;
2186 if (se->op.destroy)
2187 se->op.destroy(se->userdata);
2188
2189 send_reply_ok(req, NULL, 0);
2190 }
2191
2192 static void list_del_nreq(struct fuse_notify_req *nreq)
2193 {
2194 struct fuse_notify_req *prev = nreq->prev;
2195 struct fuse_notify_req *next = nreq->next;
2196 prev->next = next;
2197 next->prev = prev;
2198 }
2199
2200 static void list_add_nreq(struct fuse_notify_req *nreq,
2201 struct fuse_notify_req *next)
2202 {
2203 struct fuse_notify_req *prev = next->prev;
2204 nreq->next = next;
2205 nreq->prev = prev;
2206 prev->next = nreq;
2207 next->prev = nreq;
2208 }
2209
2210 static void list_init_nreq(struct fuse_notify_req *nreq)
2211 {
2212 nreq->next = nreq;
2213 nreq->prev = nreq;
2214 }
2215
2216 static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
2217 const void *inarg, const struct fuse_buf *buf)
2218 {
2219 struct fuse_session *se = req->se;
2220 struct fuse_notify_req *nreq;
2221 struct fuse_notify_req *head;
2222
2223 pthread_mutex_lock(&se->lock);
2224 head = &se->notify_list;
2225 for (nreq = head->next; nreq != head; nreq = nreq->next) {
2226 if (nreq->unique == req->unique) {
2227 list_del_nreq(nreq);
2228 break;
2229 }
2230 }
2231 pthread_mutex_unlock(&se->lock);
2232
2233 if (nreq != head)
2234 nreq->reply(nreq, req, nodeid, inarg, buf);
2235 }
2236
2237 static int send_notify_iov(struct fuse_session *se, int notify_code,
2238 struct iovec *iov, int count)
2239 {
2240 struct fuse_out_header out;
2241
2242 if (!se->got_init)
2243 return -ENOTCONN;
2244
2245 out.unique = 0;
2246 out.error = notify_code;
2247 iov[0].iov_base = &out;
2248 iov[0].iov_len = sizeof(struct fuse_out_header);
2249
2250 return fuse_send_msg(se, NULL, iov, count);
2251 }
2252
2253 int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
2254 {
2255 if (ph != NULL) {
2256 struct fuse_notify_poll_wakeup_out outarg;
2257 struct iovec iov[2];
2258
2259 outarg.kh = ph->kh;
2260
2261 iov[1].iov_base = &outarg;
2262 iov[1].iov_len = sizeof(outarg);
2263
2264 return send_notify_iov(ph->se, FUSE_NOTIFY_POLL, iov, 2);
2265 } else {
2266 return 0;
2267 }
2268 }
2269
2270 int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,
2271 off_t off, off_t len)
2272 {
2273 struct fuse_notify_inval_inode_out outarg;
2274 struct iovec iov[2];
2275
2276 if (!se)
2277 return -EINVAL;
2278
2279 if (se->conn.proto_minor < 12)
2280 return -ENOSYS;
2281
2282 outarg.ino = ino;
2283 outarg.off = off;
2284 outarg.len = len;
2285
2286 iov[1].iov_base = &outarg;
2287 iov[1].iov_len = sizeof(outarg);
2288
2289 return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2);
2290 }
2291
2292 int fuse_lowlevel_notify_expire_entry(struct fuse_session *se, fuse_ino_t parent,
2293 const char *name, size_t namelen,
2294 enum fuse_expire_flags flags)
2295 {
2296 struct fuse_notify_inval_entry_out outarg;
2297 struct iovec iov[3];
2298
2299 if (!se)
2300 return -EINVAL;
2301
2302 if (se->conn.proto_minor < 12)
2303 return -ENOSYS;
2304
2305 outarg.parent = parent;
2306 outarg.namelen = namelen;
2307 outarg.flags = 0;
2308 if (flags & FUSE_LL_EXPIRE_ONLY)
2309 outarg.flags |= FUSE_EXPIRE_ONLY;
2310
2311 iov[1].iov_base = &outarg;
2312 iov[1].iov_len = sizeof(outarg);
2313 iov[2].iov_base = (void *)name;
2314 iov[2].iov_len = namelen + 1;
2315
2316 return send_notify_iov(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
2317 }
2318
2319 int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
2320 const char *name, size_t namelen)
2321 {
2322 return fuse_lowlevel_notify_expire_entry(se, parent, name, namelen, 0);
2323 }
2324
2325
2326 int fuse_lowlevel_notify_delete(struct fuse_session *se,
2327 fuse_ino_t parent, fuse_ino_t child,
2328 const char *name, size_t namelen)
2329 {
2330 struct fuse_notify_delete_out outarg;
2331 struct iovec iov[3];
2332
2333 if (!se)
2334 return -EINVAL;
2335
2336 if (se->conn.proto_minor < 18)
2337 return -ENOSYS;
2338
2339 outarg.parent = parent;
2340 outarg.child = child;
2341 outarg.namelen = namelen;
2342 outarg.padding = 0;
2343
2344 iov[1].iov_base = &outarg;
2345 iov[1].iov_len = sizeof(outarg);
2346 iov[2].iov_base = (void *)name;
2347 iov[2].iov_len = namelen + 1;
2348
2349 return send_notify_iov(se, FUSE_NOTIFY_DELETE, iov, 3);
2350 }
2351
2352 int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino,
2353 off_t offset, struct fuse_bufvec *bufv,
2354 enum fuse_buf_copy_flags flags)
2355 {
2356 struct fuse_out_header out;
2357 struct fuse_notify_store_out outarg;
2358 struct iovec iov[3];
2359 size_t size = fuse_buf_size(bufv);
2360 int res;
2361
2362 if (!se)
2363 return -EINVAL;
2364
2365 if (se->conn.proto_minor < 15)
2366 return -ENOSYS;
2367
2368 out.unique = 0;
2369 out.error = FUSE_NOTIFY_STORE;
2370
2371 outarg.nodeid = ino;
2372 outarg.offset = offset;
2373 outarg.size = size;
2374 outarg.padding = 0;
2375
2376 iov[0].iov_base = &out;
2377 iov[0].iov_len = sizeof(out);
2378 iov[1].iov_base = &outarg;
2379 iov[1].iov_len = sizeof(outarg);
2380
2381 res = fuse_send_data_iov(se, NULL, iov, 2, bufv, flags);
2382 if (res > 0)
2383 res = -res;
2384
2385 return res;
2386 }
2387
2388 struct fuse_retrieve_req {
2389 struct fuse_notify_req nreq;
2390 void *cookie;
2391 };
2392
2393 static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
2394 fuse_req_t req, fuse_ino_t ino,
2395 const void *inarg,
2396 const struct fuse_buf *ibuf)
2397 {
2398 struct fuse_session *se = req->se;
2399 struct fuse_retrieve_req *rreq =
2400 container_of(nreq, struct fuse_retrieve_req, nreq);
2401 const struct fuse_notify_retrieve_in *arg = inarg;
2402 struct fuse_bufvec bufv = {
2403 .buf[0] = *ibuf,
2404 .count = 1,
2405 };
2406
2407 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
2408 bufv.buf[0].mem = PARAM(arg);
2409
2410 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
2411 sizeof(struct fuse_notify_retrieve_in);
2412
2413 if (bufv.buf[0].size < arg->size) {
2414 fuse_log(FUSE_LOG_ERR, "fuse: retrieve reply: buffer size too small\n");
2415 fuse_reply_none(req);
2416 goto out;
2417 }
2418 bufv.buf[0].size = arg->size;
2419
2420 if (se->op.retrieve_reply) {
2421 se->op.retrieve_reply(req, rreq->cookie, ino,
2422 arg->offset, &bufv);
2423 } else {
2424 fuse_reply_none(req);
2425 }
2426 out:
2427 free(rreq);
2428 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
2429 fuse_ll_clear_pipe(se);
2430 }
2431
2432 int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino,
2433 size_t size, off_t offset, void *cookie)
2434 {
2435 struct fuse_notify_retrieve_out outarg;
2436 struct iovec iov[2];
2437 struct fuse_retrieve_req *rreq;
2438 int err;
2439
2440 if (!se)
2441 return -EINVAL;
2442
2443 if (se->conn.proto_minor < 15)
2444 return -ENOSYS;
2445
2446 rreq = malloc(sizeof(*rreq));
2447 if (rreq == NULL)
2448 return -ENOMEM;
2449
2450 pthread_mutex_lock(&se->lock);
2451 rreq->cookie = cookie;
2452 rreq->nreq.unique = se->notify_ctr++;
2453 rreq->nreq.reply = fuse_ll_retrieve_reply;
2454 list_add_nreq(&rreq->nreq, &se->notify_list);
2455 pthread_mutex_unlock(&se->lock);
2456
2457 outarg.notify_unique = rreq->nreq.unique;
2458 outarg.nodeid = ino;
2459 outarg.offset = offset;
2460 outarg.size = size;
2461 outarg.padding = 0;
2462
2463 iov[1].iov_base = &outarg;
2464 iov[1].iov_len = sizeof(outarg);
2465
2466 err = send_notify_iov(se, FUSE_NOTIFY_RETRIEVE, iov, 2);
2467 if (err) {
2468 pthread_mutex_lock(&se->lock);
2469 list_del_nreq(&rreq->nreq);
2470 pthread_mutex_unlock(&se->lock);
2471 free(rreq);
2472 }
2473
2474 return err;
2475 }
2476
2477 void *fuse_req_userdata(fuse_req_t req)
2478 {
2479 return req->se->userdata;
2480 }
2481
2482 const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
2483 {
2484 return &req->ctx;
2485 }
2486
2487 void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
2488 void *data)
2489 {
2490 pthread_mutex_lock(&req->lock);
2491 pthread_mutex_lock(&req->se->lock);
2492 req->u.ni.func = func;
2493 req->u.ni.data = data;
2494 pthread_mutex_unlock(&req->se->lock);
2495 if (req->interrupted && func)
2496 func(req, data);
2497 pthread_mutex_unlock(&req->lock);
2498 }
2499
2500 int fuse_req_interrupted(fuse_req_t req)
2501 {
2502 int interrupted;
2503
2504 pthread_mutex_lock(&req->se->lock);
2505 interrupted = req->interrupted;
2506 pthread_mutex_unlock(&req->se->lock);
2507
2508 return interrupted;
2509 }
2510
2511 static struct {
2512 void (*func)(fuse_req_t, fuse_ino_t, const void *);
2513 const char *name;
2514 } fuse_ll_ops[] = {
2515 [FUSE_LOOKUP] = { do_lookup, "LOOKUP" },
2516 [FUSE_FORGET] = { do_forget, "FORGET" },
2517 [FUSE_GETATTR] = { do_getattr, "GETATTR" },
2518 [FUSE_SETATTR] = { do_setattr, "SETATTR" },
2519 [FUSE_READLINK] = { do_readlink, "READLINK" },
2520 [FUSE_SYMLINK] = { do_symlink, "SYMLINK" },
2521 [FUSE_MKNOD] = { do_mknod, "MKNOD" },
2522 [FUSE_MKDIR] = { do_mkdir, "MKDIR" },
2523 [FUSE_UNLINK] = { do_unlink, "UNLINK" },
2524 [FUSE_RMDIR] = { do_rmdir, "RMDIR" },
2525 [FUSE_RENAME] = { do_rename, "RENAME" },
2526 [FUSE_LINK] = { do_link, "LINK" },
2527 [FUSE_OPEN] = { do_open, "OPEN" },
2528 [FUSE_READ] = { do_read, "READ" },
2529 [FUSE_WRITE] = { do_write, "WRITE" },
2530 [FUSE_STATFS] = { do_statfs, "STATFS" },
2531 [FUSE_RELEASE] = { do_release, "RELEASE" },
2532 [FUSE_FSYNC] = { do_fsync, "FSYNC" },
2533 [FUSE_SETXATTR] = { do_setxattr, "SETXATTR" },
2534 [FUSE_GETXATTR] = { do_getxattr, "GETXATTR" },
2535 [FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" },
2536 [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
2537 [FUSE_FLUSH] = { do_flush, "FLUSH" },
2538 [FUSE_INIT] = { do_init, "INIT" },
2539 [FUSE_OPENDIR] = { do_opendir, "OPENDIR" },
2540 [FUSE_READDIR] = { do_readdir, "READDIR" },
2541 [FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" },
2542 [FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" },
2543 [FUSE_GETLK] = { do_getlk, "GETLK" },
2544 [FUSE_SETLK] = { do_setlk, "SETLK" },
2545 [FUSE_SETLKW] = { do_setlkw, "SETLKW" },
2546 [FUSE_ACCESS] = { do_access, "ACCESS" },
2547 [FUSE_CREATE] = { do_create, "CREATE" },
2548 [FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" },
2549 [FUSE_BMAP] = { do_bmap, "BMAP" },
2550 [FUSE_IOCTL] = { do_ioctl, "IOCTL" },
2551 [FUSE_POLL] = { do_poll, "POLL" },
2552 [FUSE_FALLOCATE] = { do_fallocate, "FALLOCATE" },
2553 [FUSE_DESTROY] = { do_destroy, "DESTROY" },
2554 [FUSE_NOTIFY_REPLY] = { (void *) 1, "NOTIFY_REPLY" },
2555 [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
2556 [FUSE_READDIRPLUS] = { do_readdirplus, "READDIRPLUS"},
2557 [FUSE_RENAME2] = { do_rename2, "RENAME2" },
2558 [FUSE_COPY_FILE_RANGE] = { do_copy_file_range, "COPY_FILE_RANGE" },
2559 [FUSE_LSEEK] = { do_lseek, "LSEEK" },
2560 [CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" },
2561 };
2562
2563 #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))
2564
2565 static const char *opname(enum fuse_opcode opcode)
2566 {
2567 if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
2568 return "???";
2569 else
2570 return fuse_ll_ops[opcode].name;
2571 }
2572
2573 static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst,
2574 struct fuse_bufvec *src)
2575 {
2576 ssize_t res = fuse_buf_copy(dst, src, 0);
2577 if (res < 0) {
2578 fuse_log(FUSE_LOG_ERR, "fuse: copy from pipe: %s\n", strerror(-res));
2579 return res;
2580 }
2581 if ((size_t)res < fuse_buf_size(dst)) {
2582 fuse_log(FUSE_LOG_ERR, "fuse: copy from pipe: short read\n");
2583 return -1;
2584 }
2585 return 0;
2586 }
2587
2588 void fuse_session_process_buf(struct fuse_session *se,
2589 const struct fuse_buf *buf)
2590 {
2591 fuse_session_process_buf_int(se, buf, NULL);
2592 }
2593
2594 void fuse_session_process_buf_int(struct fuse_session *se,
2595 const struct fuse_buf *buf, struct fuse_chan *ch)
2596 {
2597 const size_t write_header_size = sizeof(struct fuse_in_header) +
2598 sizeof(struct fuse_write_in);
2599 struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
2600 struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size);
2601 struct fuse_in_header *in;
2602 const void *inarg;
2603 struct fuse_req *req;
2604 void *mbuf = NULL;
2605 int err;
2606 int res;
2607
2608 if (buf->flags & FUSE_BUF_IS_FD) {
2609 if (buf->size < tmpbuf.buf[0].size)
2610 tmpbuf.buf[0].size = buf->size;
2611
2612 mbuf = malloc(tmpbuf.buf[0].size);
2613 if (mbuf == NULL) {
2614 fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate header\n");
2615 goto clear_pipe;
2616 }
2617 tmpbuf.buf[0].mem = mbuf;
2618
2619 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2620 if (res < 0)
2621 goto clear_pipe;
2622
2623 in = mbuf;
2624 } else {
2625 in = buf->mem;
2626 }
2627
2628 if (se->debug) {
2629 fuse_log(FUSE_LOG_DEBUG,
2630 "unique: %llu, opcode: %s (%i), nodeid: %llu, insize: %zu, pid: %u\n",
2631 (unsigned long long) in->unique,
2632 opname((enum fuse_opcode) in->opcode), in->opcode,
2633 (unsigned long long) in->nodeid, buf->size, in->pid);
2634 }
2635
2636 req = fuse_ll_alloc_req(se);
2637 if (req == NULL) {
2638 struct fuse_out_header out = {
2639 .unique = in->unique,
2640 .error = -ENOMEM,
2641 };
2642 struct iovec iov = {
2643 .iov_base = &out,
2644 .iov_len = sizeof(struct fuse_out_header),
2645 };
2646
2647 fuse_send_msg(se, ch, &iov, 1);
2648 goto clear_pipe;
2649 }
2650
2651 req->unique = in->unique;
2652 req->ctx.uid = in->uid;
2653 req->ctx.gid = in->gid;
2654 req->ctx.pid = in->pid;
2655 req->ch = ch ? fuse_chan_get(ch) : NULL;
2656
2657 err = EIO;
2658 if (!se->got_init) {
2659 enum fuse_opcode expected;
2660
2661 expected = se->cuse_data ? CUSE_INIT : FUSE_INIT;
2662 if (in->opcode != expected)
2663 goto reply_err;
2664 } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
2665 goto reply_err;
2666
2667 err = EACCES;
2668 /* Implement -o allow_root */
2669 if (se->deny_others && in->uid != se->owner && in->uid != 0 &&
2670 in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
2671 in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
2672 in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
2673 in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR &&
2674 in->opcode != FUSE_NOTIFY_REPLY &&
2675 in->opcode != FUSE_READDIRPLUS)
2676 goto reply_err;
2677
2678 err = ENOSYS;
2679 if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
2680 goto reply_err;
2681 if (in->opcode != FUSE_INTERRUPT) {
2682 struct fuse_req *intr;
2683 pthread_mutex_lock(&se->lock);
2684 intr = check_interrupt(se, req);
2685 list_add_req(req, &se->list);
2686 pthread_mutex_unlock(&se->lock);
2687 if (intr)
2688 fuse_reply_err(intr, EAGAIN);
2689 }
2690
2691 if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size &&
2692 (in->opcode != FUSE_WRITE || !se->op.write_buf) &&
2693 in->opcode != FUSE_NOTIFY_REPLY) {
2694 void *newmbuf;
2695
2696 err = ENOMEM;
2697 newmbuf = realloc(mbuf, buf->size);
2698 if (newmbuf == NULL)
2699 goto reply_err;
2700 mbuf = newmbuf;
2701
2702 tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size);
2703 tmpbuf.buf[0].mem = (char *)mbuf + write_header_size;
2704
2705 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2706 err = -res;
2707 if (res < 0)
2708 goto reply_err;
2709
2710 in = mbuf;
2711 }
2712
2713 inarg = (void *) &in[1];
2714 if (in->opcode == FUSE_WRITE && se->op.write_buf)
2715 do_write_buf(req, in->nodeid, inarg, buf);
2716 else if (in->opcode == FUSE_NOTIFY_REPLY)
2717 do_notify_reply(req, in->nodeid, inarg, buf);
2718 else
2719 fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
2720
2721 out_free:
2722 free(mbuf);
2723 return;
2724
2725 reply_err:
2726 fuse_reply_err(req, err);
2727 clear_pipe:
2728 if (buf->flags & FUSE_BUF_IS_FD)
2729 fuse_ll_clear_pipe(se);
2730 goto out_free;
2731 }
2732
2733 #define LL_OPTION(n,o,v) \
2734 { n, offsetof(struct fuse_session, o), v }
2735
2736 static const struct fuse_opt fuse_ll_opts[] = {
2737 LL_OPTION("debug", debug, 1),
2738 LL_OPTION("-d", debug, 1),
2739 LL_OPTION("--debug", debug, 1),
2740 LL_OPTION("allow_root", deny_others, 1),
2741 FUSE_OPT_END
2742 };
2743
2744 void fuse_lowlevel_version(void)
2745 {
2746 printf("using FUSE kernel interface version %i.%i\n",
2747 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
2748 fuse_mount_version();
2749 }
2750
2751 void fuse_lowlevel_help(void)
2752 {
2753 /* These are not all options, but the ones that are
2754 potentially of interest to an end-user */
2755 printf(
2756 " -o allow_other allow access by all users\n"
2757 " -o allow_root allow access by root\n"
2758 " -o auto_unmount auto unmount on process termination\n");
2759 }
2760
2761 void fuse_session_destroy(struct fuse_session *se)
2762 {
2763 struct fuse_ll_pipe *llp;
2764
2765 if (se->got_init && !se->got_destroy) {
2766 if (se->op.destroy)
2767 se->op.destroy(se->userdata);
2768 }
2769 llp = pthread_getspecific(se->pipe_key);
2770 if (llp != NULL)
2771 fuse_ll_pipe_free(llp);
2772 pthread_key_delete(se->pipe_key);
2773 pthread_mutex_destroy(&se->lock);
2774 free(se->cuse_data);
2775 if (se->fd != -1)
2776 close(se->fd);
2777 if (se->io != NULL)
2778 free(se->io);
2779 destroy_mount_opts(se->mo);
2780 free(se);
2781 }
2782
2783
2784 static void fuse_ll_pipe_destructor(void *data)
2785 {
2786 struct fuse_ll_pipe *llp = data;
2787 fuse_ll_pipe_free(llp);
2788 }
2789
2790 int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
2791 {
2792 return fuse_session_receive_buf_int(se, buf, NULL);
2793 }
2794
2795 int fuse_session_receive_buf_int(struct fuse_session *se, struct fuse_buf *buf,
2796 struct fuse_chan *ch)
2797 {
2798 int err;
2799 ssize_t res;
2800 #ifdef HAVE_SPLICE
2801 size_t bufsize = se->bufsize;
2802 struct fuse_ll_pipe *llp;
2803 struct fuse_buf tmpbuf;
2804
2805 if (se->conn.proto_minor < 14 || !(se->conn.want & FUSE_CAP_SPLICE_READ))
2806 goto fallback;
2807
2808 llp = fuse_ll_get_pipe(se);
2809 if (llp == NULL)
2810 goto fallback;
2811
2812 if (llp->size < bufsize) {
2813 if (llp->can_grow) {
2814 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize);
2815 if (res == -1) {
2816 llp->can_grow = 0;
2817 res = grow_pipe_to_max(llp->pipe[0]);
2818 if (res > 0)
2819 llp->size = res;
2820 goto fallback;
2821 }
2822 llp->size = res;
2823 }
2824 if (llp->size < bufsize)
2825 goto fallback;
2826 }
2827
2828 if (se->io != NULL && se->io->splice_receive != NULL) {
2829 res = se->io->splice_receive(ch ? ch->fd : se->fd, NULL,
2830 llp->pipe[1], NULL, bufsize, 0,
2831 se->userdata);
2832 } else {
2833 res = splice(ch ? ch->fd : se->fd, NULL, llp->pipe[1], NULL,
2834 bufsize, 0);
2835 }
2836 err = errno;
2837
2838 if (fuse_session_exited(se))
2839 return 0;
2840
2841 if (res == -1) {
2842 if (err == ENODEV) {
2843 /* Filesystem was unmounted, or connection was aborted
2844 via /sys/fs/fuse/connections */
2845 fuse_session_exit(se);
2846 return 0;
2847 }
2848 if (err != EINTR && err != EAGAIN)
2849 perror("fuse: splice from device");
2850 return -err;
2851 }
2852
2853 if (res < sizeof(struct fuse_in_header)) {
2854 fuse_log(FUSE_LOG_ERR, "short splice from fuse device\n");
2855 return -EIO;
2856 }
2857
2858 tmpbuf = (struct fuse_buf) {
2859 .size = res,
2860 .flags = FUSE_BUF_IS_FD,
2861 .fd = llp->pipe[0],
2862 };
2863
2864 /*
2865 * Don't bother with zero copy for small requests.
2866 * fuse_loop_mt() needs to check for FORGET so this more than
2867 * just an optimization.
2868 */
2869 if (res < sizeof(struct fuse_in_header) +
2870 sizeof(struct fuse_write_in) + pagesize) {
2871 struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 };
2872 struct fuse_bufvec dst = { .count = 1 };
2873
2874 if (!buf->mem) {
2875 buf->mem = malloc(se->bufsize);
2876 if (!buf->mem) {
2877 fuse_log(FUSE_LOG_ERR,
2878 "fuse: failed to allocate read buffer\n");
2879 return -ENOMEM;
2880 }
2881 }
2882 buf->size = se->bufsize;
2883 buf->flags = 0;
2884 dst.buf[0] = *buf;
2885
2886 res = fuse_buf_copy(&dst, &src, 0);
2887 if (res < 0) {
2888 fuse_log(FUSE_LOG_ERR, "fuse: copy from pipe: %s\n",
2889 strerror(-res));
2890 fuse_ll_clear_pipe(se);
2891 return res;
2892 }
2893 if (res < tmpbuf.size) {
2894 fuse_log(FUSE_LOG_ERR, "fuse: copy from pipe: short read\n");
2895 fuse_ll_clear_pipe(se);
2896 return -EIO;
2897 }
2898 assert(res == tmpbuf.size);
2899
2900 } else {
2901 /* Don't overwrite buf->mem, as that would cause a leak */
2902 buf->fd = tmpbuf.fd;
2903 buf->flags = tmpbuf.flags;
2904 }
2905 buf->size = tmpbuf.size;
2906
2907 return res;
2908
2909 fallback:
2910 #endif
2911 if (!buf->mem) {
2912 buf->mem = malloc(se->bufsize);
2913 if (!buf->mem) {
2914 fuse_log(FUSE_LOG_ERR,
2915 "fuse: failed to allocate read buffer\n");
2916 return -ENOMEM;
2917 }
2918 }
2919
2920 restart:
2921 if (se->io != NULL) {
2922 /* se->io->read is never NULL if se->io is not NULL as
2923 specified by fuse_session_custom_io()*/
2924 res = se->io->read(ch ? ch->fd : se->fd, buf->mem, se->bufsize,
2925 se->userdata);
2926 } else {
2927 res = read(ch ? ch->fd : se->fd, buf->mem, se->bufsize);
2928 }
2929 err = errno;
2930
2931 if (fuse_session_exited(se))
2932 return 0;
2933 if (res == -1) {
2934 /* ENOENT means the operation was interrupted, it's safe
2935 to restart */
2936 if (err == ENOENT)
2937 goto restart;
2938
2939 if (err == ENODEV) {
2940 /* Filesystem was unmounted, or connection was aborted
2941 via /sys/fs/fuse/connections */
2942 fuse_session_exit(se);
2943 return 0;
2944 }
2945 /* Errors occurring during normal operation: EINTR (read
2946 interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
2947 umounted) */
2948 if (err != EINTR && err != EAGAIN)
2949 perror("fuse: reading device");
2950 return -err;
2951 }
2952 if ((size_t) res < sizeof(struct fuse_in_header)) {
2953 fuse_log(FUSE_LOG_ERR, "short read on fuse device\n");
2954 return -EIO;
2955 }
2956
2957 buf->size = res;
2958
2959 return res;
2960 }
2961
2962 struct fuse_session *fuse_session_new(struct fuse_args *args,
2963 const struct fuse_lowlevel_ops *op,
2964 size_t op_size, void *userdata)
2965 {
2966 int err;
2967 struct fuse_session *se;
2968 struct mount_opts *mo;
2969
2970 if (sizeof(struct fuse_lowlevel_ops) < op_size) {
2971 fuse_log(FUSE_LOG_ERR, "fuse: warning: library too old, some operations may not work\n");
2972 op_size = sizeof(struct fuse_lowlevel_ops);
2973 }
2974
2975 if (args->argc == 0) {
2976 fuse_log(FUSE_LOG_ERR, "fuse: empty argv passed to fuse_session_new().\n");
2977 return NULL;
2978 }
2979
2980 se = (struct fuse_session *) calloc(1, sizeof(struct fuse_session));
2981 if (se == NULL) {
2982 fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate fuse object\n");
2983 goto out1;
2984 }
2985 se->fd = -1;
2986 se->conn.max_write = UINT_MAX;
2987 se->conn.max_readahead = UINT_MAX;
2988
2989 /* Parse options */
2990 if(fuse_opt_parse(args, se, fuse_ll_opts, NULL) == -1)
2991 goto out2;
2992 if(se->deny_others) {
2993 /* Allowing access only by root is done by instructing
2994 * kernel to allow access by everyone, and then restricting
2995 * access to root and mountpoint owner in libfuse.
2996 */
2997 // We may be adding the option a second time, but
2998 // that doesn't hurt.
2999 if(fuse_opt_add_arg(args, "-oallow_other") == -1)
3000 goto out2;
3001 }
3002 mo = parse_mount_opts(args);
3003 if (mo == NULL)
3004 goto out3;
3005
3006 if(args->argc == 1 &&
3007 args->argv[0][0] == '-') {
3008 fuse_log(FUSE_LOG_ERR, "fuse: warning: argv[0] looks like an option, but "
3009 "will be ignored\n");
3010 } else if (args->argc != 1) {
3011 int i;
3012 fuse_log(FUSE_LOG_ERR, "fuse: unknown option(s): `");
3013 for(i = 1; i < args->argc-1; i++)
3014 fuse_log(FUSE_LOG_ERR, "%s ", args->argv[i]);
3015 fuse_log(FUSE_LOG_ERR, "%s'\n", args->argv[i]);
3016 goto out4;
3017 }
3018
3019 if (se->debug)
3020 fuse_log(FUSE_LOG_DEBUG, "FUSE library version: %s\n", PACKAGE_VERSION);
3021
3022 se->bufsize = FUSE_MAX_MAX_PAGES * getpagesize() +
3023 FUSE_BUFFER_HEADER_SIZE;
3024
3025 list_init_req(&se->list);
3026 list_init_req(&se->interrupts);
3027 list_init_nreq(&se->notify_list);
3028 se->notify_ctr = 1;
3029 pthread_mutex_init(&se->lock, NULL);
3030
3031 err = pthread_key_create(&se->pipe_key, fuse_ll_pipe_destructor);
3032 if (err) {
3033 fuse_log(FUSE_LOG_ERR, "fuse: failed to create thread specific key: %s\n",
3034 strerror(err));
3035 goto out5;
3036 }
3037
3038 memcpy(&se->op, op, op_size);
3039 se->owner = getuid();
3040 se->userdata = userdata;
3041
3042 se->mo = mo;
3043 return se;
3044
3045 out5:
3046 pthread_mutex_destroy(&se->lock);
3047 out4:
3048 fuse_opt_free_args(args);
3049 out3:
3050 if (mo != NULL)
3051 destroy_mount_opts(mo);
3052 out2:
3053 free(se);
3054 out1:
3055 return NULL;
3056 }
3057
3058 int fuse_session_custom_io(struct fuse_session *se, const struct fuse_custom_io *io,
3059 int fd)
3060 {
3061 if (fd < 0) {
3062 fuse_log(FUSE_LOG_ERR, "Invalid file descriptor value %d passed to "
3063 "fuse_session_custom_io()\n", fd);
3064 return -EBADF;
3065 }
3066 if (io == NULL) {
3067 fuse_log(FUSE_LOG_ERR, "No custom IO passed to "
3068 "fuse_session_custom_io()\n");
3069 return -EINVAL;
3070 } else if (io->read == NULL || io->writev == NULL) {
3071 /* If the user provides their own file descriptor, we can't
3072 guarantee that the default behavior of the io operations made
3073 in libfuse will function properly. Therefore, we enforce the
3074 user to implement these io operations when using custom io. */
3075 fuse_log(FUSE_LOG_ERR, "io passed to fuse_session_custom_io() must "
3076 "implement both io->read() and io->writev\n");
3077 return -EINVAL;
3078 }
3079
3080 se->io = malloc(sizeof(struct fuse_custom_io));
3081 if (se->io == NULL) {
3082 fuse_log(FUSE_LOG_ERR, "Failed to allocate memory for custom io. "
3083 "Error: %s\n", strerror(errno));
3084 return -errno;
3085 }
3086
3087 se->fd = fd;
3088 *se->io = *io;
3089 return 0;
3090 }
3091
3092 int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
3093 {
3094 int fd;
3095
3096 /*
3097 * Make sure file descriptors 0, 1 and 2 are open, otherwise chaos
3098 * would ensue.
3099 */
3100 do {
3101 fd = open("/dev/null", O_RDWR);
3102 if (fd > 2)
3103 close(fd);
3104 } while (fd >= 0 && fd <= 2);
3105
3106 /*
3107 * To allow FUSE daemons to run without privileges, the caller may open
3108 * /dev/fuse before launching the file system and pass on the file
3109 * descriptor by specifying /dev/fd/N as the mount point. Note that the
3110 * parent process takes care of performing the mount in this case.
3111 */
3112 fd = fuse_mnt_parse_fuse_fd(mountpoint);
3113 if (fd != -1) {
3114 if (fcntl(fd, F_GETFD) == -1) {
3115 fuse_log(FUSE_LOG_ERR,
3116 "fuse: Invalid file descriptor /dev/fd/%u\n",
3117 fd);
3118 return -1;
3119 }
3120 se->fd = fd;
3121 return 0;
3122 }
3123
3124 /* Open channel */
3125 fd = fuse_kern_mount(mountpoint, se->mo);
3126 if (fd == -1)
3127 return -1;
3128 se->fd = fd;
3129
3130 /* Save mountpoint */
3131 se->mountpoint = strdup(mountpoint);
3132 if (se->mountpoint == NULL)
3133 goto error_out;
3134
3135 return 0;
3136
3137 error_out:
3138 fuse_kern_unmount(mountpoint, fd);
3139 return -1;
3140 }
3141
3142 int fuse_session_fd(struct fuse_session *se)
3143 {
3144 return se->fd;
3145 }
3146
3147 void fuse_session_unmount(struct fuse_session *se)
3148 {
3149 if (se->mountpoint != NULL) {
3150 fuse_kern_unmount(se->mountpoint, se->fd);
3151 se->fd = -1;
3152 free(se->mountpoint);
3153 se->mountpoint = NULL;
3154 }
3155 }
3156
3157 #ifdef linux
3158 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
3159 {
3160 char *buf;
3161 size_t bufsize = 1024;
3162 char path[128];
3163 int ret;
3164 int fd;
3165 unsigned long pid = req->ctx.pid;
3166 char *s;
3167
3168 sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);
3169
3170 retry:
3171 buf = malloc(bufsize);
3172 if (buf == NULL)
3173 return -ENOMEM;
3174
3175 ret = -EIO;
3176 fd = open(path, O_RDONLY);
3177 if (fd == -1)
3178 goto out_free;
3179
3180 ret = read(fd, buf, bufsize);
3181 close(fd);
3182 if (ret < 0) {
3183 ret = -EIO;
3184 goto out_free;
3185 }
3186
3187 if ((size_t)ret == bufsize) {
3188 free(buf);
3189 bufsize *= 4;
3190 goto retry;
3191 }
3192
3193 ret = -EIO;
3194 s = strstr(buf, "\nGroups:");
3195 if (s == NULL)
3196 goto out_free;
3197
3198 s += 8;
3199 ret = 0;
3200 while (1) {
3201 char *end;
3202 unsigned long val = strtoul(s, &end, 0);
3203 if (end == s)
3204 break;
3205
3206 s = end;
3207 if (ret < size)
3208 list[ret] = val;
3209 ret++;
3210 }
3211
3212 out_free:
3213 free(buf);
3214 return ret;
3215 }
3216 #else /* linux */
3217 /*
3218 * This is currently not implemented on other than Linux...
3219 */
3220 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
3221 {
3222 (void) req; (void) size; (void) list;
3223 return -ENOSYS;
3224 }
3225 #endif
3226
3227 /* Prevent spurious data race warning - we don't care
3228 * about races for this flag */
3229 __attribute__((no_sanitize_thread))
3230 void fuse_session_exit(struct fuse_session *se)
3231 {
3232 se->exited = 1;
3233 }
3234
3235 __attribute__((no_sanitize_thread))
3236 void fuse_session_reset(struct fuse_session *se)
3237 {
3238 se->exited = 0;
3239 se->error = 0;
3240 }
3241
3242 __attribute__((no_sanitize_thread))
3243 int fuse_session_exited(struct fuse_session *se)
3244 {
3245 return se->exited;
3246 }
FUSE_CAP_IOCTL_DIR
#define FUSE_CAP_IOCTL_DIR
Definition: fuse_common.h:232
FUSE_CAP_DONT_MASK
#define FUSE_CAP_DONT_MASK
Definition: fuse_common.h:187
FUSE_CAP_HANDLE_KILLPRIV
#define FUSE_CAP_HANDLE_KILLPRIV
Definition: fuse_common.h:361
FUSE_CAP_AUTO_INVAL_DATA
#define FUSE_CAP_AUTO_INVAL_DATA
Definition: fuse_common.h:254
FUSE_CAP_SPLICE_READ
#define FUSE_CAP_SPLICE_READ
Definition: fuse_common.h:212
FUSE_CAP_PARALLEL_DIROPS
#define FUSE_CAP_PARALLEL_DIROPS
Definition: fuse_common.h:333
fuse_buf_size
size_t fuse_buf_size(const struct fuse_bufvec *bufv)
Definition: buffer.c:22
FUSE_CAP_WRITEBACK_CACHE
#define FUSE_CAP_WRITEBACK_CACHE
Definition: fuse_common.h:310
FUSE_CAP_EXPIRE_ONLY
#define FUSE_CAP_EXPIRE_ONLY
Definition: fuse_common.h:425
FUSE_CAP_ATOMIC_O_TRUNC
#define FUSE_CAP_ATOMIC_O_TRUNC
Definition: fuse_common.h:172
FUSE_CAP_ASYNC_READ
#define FUSE_CAP_ASYNC_READ
Definition: fuse_common.h:155
FUSE_CAP_SPLICE_WRITE
#define FUSE_CAP_SPLICE_WRITE
Definition: fuse_common.h:195
FUSE_CAP_CACHE_SYMLINKS
#define FUSE_CAP_CACHE_SYMLINKS
Definition: fuse_common.h:374
FUSE_CAP_POSIX_ACL
#define FUSE_CAP_POSIX_ACL
Definition: fuse_common.h:352
FUSE_BUF_IS_FD
@ FUSE_BUF_IS_FD
Definition: fuse_common.h:663
FUSE_CAP_EXPORT_SUPPORT
#define FUSE_CAP_EXPORT_SUPPORT
Definition: fuse_common.h:179
FUSE_CAP_POSIX_LOCKS
#define FUSE_CAP_POSIX_LOCKS
Definition: fuse_common.h:163
FUSE_CAP_EXPLICIT_INVAL_DATA
#define FUSE_CAP_EXPLICIT_INVAL_DATA
Definition: fuse_common.h:409
FUSE_CAP_READDIRPLUS_AUTO
#define FUSE_CAP_READDIRPLUS_AUTO
Definition: fuse_common.h:290
fuse_buf_copy
ssize_t fuse_buf_copy(struct fuse_bufvec *dst, struct fuse_bufvec *src, enum fuse_buf_copy_flags flags)
Definition: buffer.c:284
FUSE_CAP_NO_OPENDIR_SUPPORT
#define FUSE_CAP_NO_OPENDIR_SUPPORT
Definition: fuse_common.h:386
FUSE_CAP_ASYNC_DIO
#define FUSE_CAP_ASYNC_DIO
Definition: fuse_common.h:301
FUSE_CAP_NO_OPEN_SUPPORT
#define FUSE_CAP_NO_OPEN_SUPPORT
Definition: fuse_common.h:323
FUSE_CAP_READDIRPLUS
#define FUSE_CAP_READDIRPLUS
Definition: fuse_common.h:262
fuse_pollhandle_destroy
void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
Definition: fuse_lowlevel.c:1832
fuse_buf_copy_flags
fuse_buf_copy_flags
Definition: fuse_common.h:687
FUSE_BUF_SPLICE_NONBLOCK
@ FUSE_BUF_SPLICE_NONBLOCK
Definition: fuse_common.h:723
FUSE_BUF_FORCE_SPLICE
@ FUSE_BUF_FORCE_SPLICE
Definition: fuse_common.h:705
FUSE_BUF_NO_SPLICE
@ FUSE_BUF_NO_SPLICE
Definition: fuse_common.h:697
FUSE_BUF_SPLICE_MOVE
@ FUSE_BUF_SPLICE_MOVE
Definition: fuse_common.h:714
FUSE_CAP_SPLICE_MOVE
#define FUSE_CAP_SPLICE_MOVE
Definition: fuse_common.h:203
FUSE_CAP_FLOCK_LOCKS
#define FUSE_CAP_FLOCK_LOCKS
Definition: fuse_common.h:225
fuse_log
void fuse_log(enum fuse_log_level level, const char *fmt,...)
Definition: fuse_log.c:33
fuse_session_destroy
void fuse_session_destroy(struct fuse_session *se)
Definition: fuse_lowlevel.c:2759
fuse_expire_flags
fuse_expire_flags
Definition: fuse_lowlevel.h:146
fuse_reply_data
int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv, enum fuse_buf_copy_flags flags)
Definition: fuse_lowlevel.c:867
fuse_reply_lock
int fuse_reply_lock(fuse_req_t req, const struct flock *lock)
Definition: fuse_lowlevel.c:911
fuse_reply_open
int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *fi)
Definition: fuse_lowlevel.c:462
fuse_session_exit
void fuse_session_exit(struct fuse_session *se)
fuse_interrupt_func_t
void(* fuse_interrupt_func_t)(fuse_req_t req, void *data)
Definition: fuse_lowlevel.h:1872
fuse_reply_poll
int fuse_reply_poll(fuse_req_t req, unsigned revents)
Definition: fuse_lowlevel.c:1071
fuse_reply_err
int fuse_reply_err(fuse_req_t req, int err)
Definition: fuse_lowlevel.c:319
fuse_reply_buf
int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
Definition: fuse_lowlevel.c:481
fuse_req_t
struct fuse_req * fuse_req_t
Definition: fuse_lowlevel.h:49
fuse_add_direntry_plus
size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct fuse_entry_param *e, off_t off)
Definition: fuse_lowlevel.c:364
fuse_reply_ioctl_iov
int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov, int count)
Definition: fuse_lowlevel.c:1047
fuse_lowlevel_notify_delete
int fuse_lowlevel_notify_delete(struct fuse_session *se, fuse_ino_t parent, fuse_ino_t child, const char *name, size_t namelen)
Definition: fuse_lowlevel.c:2324
fuse_session_process_buf
void fuse_session_process_buf(struct fuse_session *se, const struct fuse_buf *buf)
Definition: fuse_lowlevel.c:2586
fuse_session_exited
int fuse_session_exited(struct fuse_session *se)
fuse_session_fd
int fuse_session_fd(struct fuse_session *se)
Definition: fuse_lowlevel.c:3140
fuse_req_interrupted
int fuse_req_interrupted(fuse_req_t req)
Definition: fuse_lowlevel.c:2498
fuse_req_getgroups
int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
Definition: fuse_lowlevel.c:3218
fuse_lowlevel_notify_retrieve
int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino, size_t size, off_t offset, void *cookie)
Definition: fuse_lowlevel.c:2430
fuse_reply_readlink
int fuse_reply_readlink(fuse_req_t req, const char *link)
Definition: fuse_lowlevel.c:457
fuse_reply_iov
int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
Definition: fuse_lowlevel.c:253
fuse_reply_bmap
int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
Definition: fuse_lowlevel.c:928
fuse_reply_entry
int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
Definition: fuse_lowlevel.c:410
fuse_session_unmount
void fuse_session_unmount(struct fuse_session *se)
Definition: fuse_lowlevel.c:3145
fuse_reply_none
void fuse_reply_none(fuse_req_t req)
Definition: fuse_lowlevel.c:324
fuse_reply_ioctl_retry
int fuse_reply_ioctl_retry(fuse_req_t req, const struct iovec *in_iov, size_t in_count, const struct iovec *out_iov, size_t out_count)
Definition: fuse_lowlevel.c:956
fuse_lowlevel_help
void fuse_lowlevel_help(void)
Definition: fuse_lowlevel.c:2749
fuse_lowlevel_notify_inval_inode
int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino, off_t off, off_t len)
Definition: fuse_lowlevel.c:2268
fuse_session_new
struct fuse_session * fuse_session_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata)
Definition: fuse_lowlevel.c:2960
fuse_reply_statfs
int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
Definition: fuse_lowlevel.c:889
fuse_reply_write
int fuse_reply_write(fuse_req_t req, size_t count)
Definition: fuse_lowlevel.c:471
fuse_session_receive_buf
int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
Definition: fuse_lowlevel.c:2788
fuse_session_mount
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
Definition: fuse_lowlevel.c:3090
fuse_req_userdata
void * fuse_req_userdata(fuse_req_t req)
Definition: fuse_lowlevel.c:2475
fuse_lowlevel_notify_expire_entry
int fuse_lowlevel_notify_expire_entry(struct fuse_session *se, fuse_ino_t parent, const char *name, size_t namelen, enum fuse_expire_flags flags)
Definition: fuse_lowlevel.c:2290
fuse_lowlevel_notify_poll
int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
Definition: fuse_lowlevel.c:2251
fuse_lowlevel_notify_inval_entry
int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent, const char *name, size_t namelen)
Definition: fuse_lowlevel.c:2317
fuse_req_interrupt_func
void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func, void *data)
Definition: fuse_lowlevel.c:2485
fuse_session_reset
void fuse_session_reset(struct fuse_session *se)
fuse_session_custom_io
int fuse_session_custom_io(struct fuse_session *se, const struct fuse_custom_io *io, int fd)
Definition: fuse_lowlevel.c:3056
fuse_reply_create
int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e, const struct fuse_file_info *fi)
Definition: fuse_lowlevel.c:426
fuse_reply_lseek
int fuse_reply_lseek(fuse_req_t req, off_t off)
Definition: fuse_lowlevel.c:1081
fuse_lowlevel_version
void fuse_lowlevel_version(void)
Definition: fuse_lowlevel.c:2742
fuse_ino_t
uint64_t fuse_ino_t
Definition: fuse_lowlevel.h:46
fuse_add_direntry
size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct stat *stbuf, off_t off)
Definition: fuse_lowlevel.c:274
fuse_req_ctx
const struct fuse_ctx * fuse_req_ctx(fuse_req_t req)
Definition: fuse_lowlevel.c:2480
fuse_reply_attr
int fuse_reply_attr(fuse_req_t req, const struct stat *attr, double attr_timeout)
Definition: fuse_lowlevel.c:442
fuse_reply_ioctl
int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
Definition: fuse_lowlevel.c:1026
fuse_lowlevel_notify_store
int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino, off_t offset, struct fuse_bufvec *bufv, enum fuse_buf_copy_flags flags)
Definition: fuse_lowlevel.c:2350
fuse_reply_xattr
int fuse_reply_xattr(fuse_req_t req, size_t count)
Definition: fuse_lowlevel.c:901
fuse_opt_add_arg
int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
Definition: fuse_opt.c:55
fuse_opt_free_args
void fuse_opt_free_args(struct fuse_args *args)
Definition: fuse_opt.c:34
fuse_opt_parse
int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
Definition: fuse_opt.c:398
FUSE_OPT_END
#define FUSE_OPT_END
Definition: fuse_opt.h:104
fuse_args
Definition: fuse_opt.h:109
fuse_args::argc
int argc
Definition: fuse_opt.h:111
fuse_args::argv
char ** argv
Definition: fuse_opt.h:114
fuse_buf
Definition: fuse_common.h:732
fuse_buf::flags
enum fuse_buf_flags flags
Definition: fuse_common.h:741
fuse_buf::fd
int fd
Definition: fuse_common.h:755
fuse_buf::mem
void * mem
Definition: fuse_common.h:748
fuse_buf::size
size_t size
Definition: fuse_common.h:736
fuse_bufvec
Definition: fuse_common.h:773
fuse_bufvec::off
size_t off
Definition: fuse_common.h:787
fuse_bufvec::buf
struct fuse_buf buf[1]
Definition: fuse_common.h:792
fuse_bufvec::idx
size_t idx
Definition: fuse_common.h:782
fuse_bufvec::count
size_t count
Definition: fuse_common.h:777
fuse_ctx
Definition: fuse_lowlevel.h:111
fuse_entry_param
Definition: fuse_lowlevel.h:59
fuse_entry_param::entry_timeout
double entry_timeout
Definition: fuse_lowlevel.h:100
fuse_entry_param::ino
fuse_ino_t ino
Definition: fuse_lowlevel.h:67
fuse_entry_param::generation
uint64_t generation
Definition: fuse_lowlevel.h:79
fuse_entry_param::attr_timeout
double attr_timeout
Definition: fuse_lowlevel.h:94
fuse_entry_param::attr
struct stat attr
Definition: fuse_lowlevel.h:88
fuse_file_info
Definition: fuse_common.h:44
fuse_file_info::direct_io
unsigned int direct_io
Definition: fuse_common.h:57
fuse_file_info::keep_cache
unsigned int keep_cache
Definition: fuse_common.h:64
fuse_file_info::nonseekable
unsigned int nonseekable
Definition: fuse_common.h:73
fuse_file_info::lock_owner
uint64_t lock_owner
Definition: fuse_common.h:100
fuse_file_info::fh
uint64_t fh
Definition: fuse_common.h:97
fuse_file_info::poll_events
uint32_t poll_events
Definition: fuse_common.h:104
fuse_file_info::noflush
unsigned int noflush
Definition: fuse_common.h:88
fuse_file_info::writepage
unsigned int writepage
Definition: fuse_common.h:54
fuse_file_info::flush
unsigned int flush
Definition: fuse_common.h:69
fuse_file_info::flags
int flags
Definition: fuse_common.h:46
fuse_file_info::cache_readdir
unsigned int cache_readdir
Definition: fuse_common.h:84
fuse_lowlevel_ops
Definition: fuse_lowlevel.h:192
fuse_opt
Definition: fuse_opt.h:77