libfuse: lib/fuse_lowlevel.c Source File

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 "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 pthread_mutex_destroy(&req->lock);
127 free(req);
128 }
129
130 void fuse_free_req(fuse_req_t req)
131 {
132 int ctr;
133 struct fuse_session *se = req->se;
134
135 pthread_mutex_lock(&se->lock);
136 req->u.ni.func = NULL;
137 req->u.ni.data = NULL;
138 list_del_req(req);
139 ctr = --req->ctr;
140 fuse_chan_put(req->ch);
141 req->ch = NULL;
142 pthread_mutex_unlock(&se->lock);
143 if (!ctr)
144 destroy_req(req);
145 }
146
147 static struct fuse_req *fuse_ll_alloc_req(struct fuse_session *se)
148 {
149 struct fuse_req *req;
150
151 req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
152 if (req == NULL) {
153 fprintf(stderr, "fuse: failed to allocate request\n");
154 } else {
155 req->se = se;
156 req->ctr = 1;
157 list_init_req(req);
158 fuse_mutex_init(&req->lock);
159 }
160
161 return req;
162 }
163
164 /* Send data. If *ch* is NULL, send via session master fd */
165 static int fuse_send_msg(struct fuse_session *se, struct fuse_chan *ch,
166 struct iovec *iov, int count)
167 {
168 struct fuse_out_header *out = iov[0].iov_base;
169
170 out->len = iov_length(iov, count);
171 if (se->debug) {
172 if (out->unique == 0) {
173 fprintf(stderr, "NOTIFY: code=%d length=%u\n",
174 out->error, out->len);
175 } else if (out->error) {
176 fprintf(stderr,
177 " unique: %llu, error: %i (%s), outsize: %i\n",
178 (unsigned long long) out->unique, out->error,
179 strerror(-out->error), out->len);
180 } else {
181 fprintf(stderr,
182 " unique: %llu, success, outsize: %i\n",
183 (unsigned long long) out->unique, out->len);
184 }
185 }
186
187 ssize_t res = writev(ch ? ch->fd : se->fd,
188 iov, count);
189 int err = errno;
190
191 if (res == -1) {
192 assert(se != NULL);
193
194 /* ENOENT means the operation was interrupted */
195 if (!fuse_session_exited(se) && err != ENOENT)
196 perror("fuse: writing device");
197 return -err;
198 }
199
200 return 0;
201 }
202
203
204 int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
205 int count)
206 {
207 struct fuse_out_header out;
208
209 if (error <= -1000 || error > 0) {
210 fprintf(stderr, "fuse: bad error value: %i\n", error);
211 error = -ERANGE;
212 }
213
214 out.unique = req->unique;
215 out.error = error;
216
217 iov[0].iov_base = &out;
218 iov[0].iov_len = sizeof(struct fuse_out_header);
219
220 return fuse_send_msg(req->se, req->ch, iov, count);
221 }
222
223 static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
224 int count)
225 {
226 int res;
227
228 res = fuse_send_reply_iov_nofree(req, error, iov, count);
229 fuse_free_req(req);
230 return res;
231 }
232
233 static int send_reply(fuse_req_t req, int error, const void *arg,
234 size_t argsize)
235 {
236 struct iovec iov[2];
237 int count = 1;
238 if (argsize) {
239 iov[1].iov_base = (void *) arg;
240 iov[1].iov_len = argsize;
241 count++;
242 }
243 return send_reply_iov(req, error, iov, count);
244 }
245
246 int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
247 {
248 int res;
249 struct iovec *padded_iov;
250
251 padded_iov = malloc((count + 1) * sizeof(struct iovec));
252 if (padded_iov == NULL)
253 return fuse_reply_err(req, ENOMEM);
254
255 memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
256 count++;
257
258 res = send_reply_iov(req, 0, padded_iov, count);
259 free(padded_iov);
260
261 return res;
262 }
263
264
265 /* `buf` is allowed to be empty so that the proper size may be
266 allocated by the caller */
267 size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
268 const char *name, const struct stat *stbuf, off_t off)
269 {
270 (void)req;
271 size_t namelen;
272 size_t entlen;
273 size_t entlen_padded;
274 struct fuse_dirent *dirent;
275
276 namelen = strlen(name);
277 entlen = FUSE_NAME_OFFSET + namelen;
278 entlen_padded = FUSE_DIRENT_ALIGN(entlen);
279
280 if ((buf == NULL) || (entlen_padded > bufsize))
281 return entlen_padded;
282
283 dirent = (struct fuse_dirent*) buf;
284 dirent->ino = stbuf->st_ino;
285 dirent->off = off;
286 dirent->namelen = namelen;
287 dirent->type = (stbuf->st_mode & S_IFMT) >> 12;
288 strncpy(dirent->name, name, namelen);
289 memset(dirent->name + namelen, 0, entlen_padded - entlen);
290
291 return entlen_padded;
292 }
293
294 static void convert_statfs(const struct statvfs *stbuf,
295 struct fuse_kstatfs *kstatfs)
296 {
297 kstatfs->bsize = stbuf->f_bsize;
298 kstatfs->frsize = stbuf->f_frsize;
299 kstatfs->blocks = stbuf->f_blocks;
300 kstatfs->bfree = stbuf->f_bfree;
301 kstatfs->bavail = stbuf->f_bavail;
302 kstatfs->files = stbuf->f_files;
303 kstatfs->ffree = stbuf->f_ffree;
304 kstatfs->namelen = stbuf->f_namemax;
305 }
306
307 static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize)
308 {
309 return send_reply(req, 0, arg, argsize);
310 }
311
312 int fuse_reply_err(fuse_req_t req, int err)
313 {
314 return send_reply(req, -err, NULL, 0);
315 }
316
317 void fuse_reply_none(fuse_req_t req)
318 {
319 fuse_free_req(req);
320 }
321
322 static unsigned long calc_timeout_sec(double t)
323 {
324 if (t > (double) ULONG_MAX)
325 return ULONG_MAX;
326 else if (t < 0.0)
327 return 0;
328 else
329 return (unsigned long) t;
330 }
331
332 static unsigned int calc_timeout_nsec(double t)
333 {
334 double f = t - (double) calc_timeout_sec(t);
335 if (f < 0.0)
336 return 0;
337 else if (f >= 0.999999999)
338 return 999999999;
339 else
340 return (unsigned int) (f * 1.0e9);
341 }
342
343 static void fill_entry(struct fuse_entry_out *arg,
344 const struct fuse_entry_param *e)
345 {
346 arg->nodeid = e->ino;
347 arg->generation = e->generation;
348 arg->entry_valid = calc_timeout_sec(e->entry_timeout);
349 arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout);
350 arg->attr_valid = calc_timeout_sec(e->attr_timeout);
351 arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout);
352 convert_stat(&e->attr, &arg->attr);
353 }
354
355 /* `buf` is allowed to be empty so that the proper size may be
356 allocated by the caller */
357 size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize,
358 const char *name,
359 const struct fuse_entry_param *e, off_t off)
360 {
361 (void)req;
362 size_t namelen;
363 size_t entlen;
364 size_t entlen_padded;
365
366 namelen = strlen(name);
367 entlen = FUSE_NAME_OFFSET_DIRENTPLUS + namelen;
368 entlen_padded = FUSE_DIRENT_ALIGN(entlen);
369 if ((buf == NULL) || (entlen_padded > bufsize))
370 return entlen_padded;
371
372 struct fuse_direntplus *dp = (struct fuse_direntplus *) buf;
373 memset(&dp->entry_out, 0, sizeof(dp->entry_out));
374 fill_entry(&dp->entry_out, e);
375
376 struct fuse_dirent *dirent = &dp->dirent;
377 dirent->ino = e->attr.st_ino;
378 dirent->off = off;
379 dirent->namelen = namelen;
380 dirent->type = (e->attr.st_mode & S_IFMT) >> 12;
381 strncpy(dirent->name, name, namelen);
382 memset(dirent->name + namelen, 0, entlen_padded - entlen);
383
384 return entlen_padded;
385 }
386
387 static void fill_open(struct fuse_open_out *arg,
388 const struct fuse_file_info *f)
389 {
390 arg->fh = f->fh;
391 if (f->direct_io)
392 arg->open_flags |= FOPEN_DIRECT_IO;
393 if (f->keep_cache)
394 arg->open_flags |= FOPEN_KEEP_CACHE;
395 if (f->cache_readdir)
396 arg->open_flags |= FOPEN_CACHE_DIR;
397 if (f->nonseekable)
398 arg->open_flags |= FOPEN_NONSEEKABLE;
399 }
400
401 int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
402 {
403 struct fuse_entry_out arg;
404 size_t size = req->se->conn.proto_minor < 9 ?
405 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);
406
407 /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
408 negative entry */
409 if (!e->ino && req->se->conn.proto_minor < 4)
410 return fuse_reply_err(req, ENOENT);
411
412 memset(&arg, 0, sizeof(arg));
413 fill_entry(&arg, e);
414 return send_reply_ok(req, &arg, size);
415 }
416
417 int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
418 const struct fuse_file_info *f)
419 {
420 char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)];
421 size_t entrysize = req->se->conn.proto_minor < 9 ?
422 FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
423 struct fuse_entry_out *earg = (struct fuse_entry_out *) buf;
424 struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize);
425
426 memset(buf, 0, sizeof(buf));
427 fill_entry(earg, e);
428 fill_open(oarg, f);
429 return send_reply_ok(req, buf,
430 entrysize + sizeof(struct fuse_open_out));
431 }
432
433 int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
434 double attr_timeout)
435 {
436 struct fuse_attr_out arg;
437 size_t size = req->se->conn.proto_minor < 9 ?
438 FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);
439
440 memset(&arg, 0, sizeof(arg));
441 arg.attr_valid = calc_timeout_sec(attr_timeout);
442 arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout);
443 convert_stat(attr, &arg.attr);
444
445 return send_reply_ok(req, &arg, size);
446 }
447
448 int fuse_reply_readlink(fuse_req_t req, const char *linkname)
449 {
450 return send_reply_ok(req, linkname, strlen(linkname));
451 }
452
453 int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f)
454 {
455 struct fuse_open_out arg;
456
457 memset(&arg, 0, sizeof(arg));
458 fill_open(&arg, f);
459 return send_reply_ok(req, &arg, sizeof(arg));
460 }
461
462 int fuse_reply_write(fuse_req_t req, size_t count)
463 {
464 struct fuse_write_out arg;
465
466 memset(&arg, 0, sizeof(arg));
467 arg.size = count;
468
469 return send_reply_ok(req, &arg, sizeof(arg));
470 }
471
472 int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
473 {
474 return send_reply_ok(req, buf, size);
475 }
476
477 static int fuse_send_data_iov_fallback(struct fuse_session *se,
478 struct fuse_chan *ch,
479 struct iovec *iov, int iov_count,
480 struct fuse_bufvec *buf,
481 size_t len)
482 {
483 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
484 void *mbuf;
485 int res;
486
487 /* Optimize common case */
488 if (buf->count == 1 && buf->idx == 0 && buf->off == 0 &&
489 !(buf->buf[0].flags & FUSE_BUF_IS_FD)) {
490 /* FIXME: also avoid memory copy if there are multiple buffers
491 but none of them contain an fd */
492
493 iov[iov_count].iov_base = buf->buf[0].mem;
494 iov[iov_count].iov_len = len;
495 iov_count++;
496 return fuse_send_msg(se, ch, iov, iov_count);
497 }
498
499 res = posix_memalign(&mbuf, pagesize, len);
500 if (res != 0)
501 return res;
502
503 mem_buf.buf[0].mem = mbuf;
504 res = fuse_buf_copy(&mem_buf, buf, 0);
505 if (res < 0) {
506 free(mbuf);
507 return -res;
508 }
509 len = res;
510
511 iov[iov_count].iov_base = mbuf;
512 iov[iov_count].iov_len = len;
513 iov_count++;
514 res = fuse_send_msg(se, ch, iov, iov_count);
515 free(mbuf);
516
517 return res;
518 }
519
520 struct fuse_ll_pipe {
521 size_t size;
522 int can_grow;
523 int pipe[2];
524 };
525
526 static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp)
527 {
528 close(llp->pipe[0]);
529 close(llp->pipe[1]);
530 free(llp);
531 }
532
533 #ifdef HAVE_SPLICE
534 #if !defined(HAVE_PIPE2) || !defined(O_CLOEXEC)
535 static int fuse_pipe(int fds[2])
536 {
537 int rv = pipe(fds);
538
539 if (rv == -1)
540 return rv;
541
542 if (fcntl(fds[0], F_SETFL, O_NONBLOCK) == -1 ||
543 fcntl(fds[1], F_SETFL, O_NONBLOCK) == -1 ||
544 fcntl(fds[0], F_SETFD, FD_CLOEXEC) == -1 ||
545 fcntl(fds[1], F_SETFD, FD_CLOEXEC) == -1) {
546 close(fds[0]);
547 close(fds[1]);
548 rv = -1;
549 }
550 return rv;
551 }
552 #else
553 static int fuse_pipe(int fds[2])
554 {
555 return pipe2(fds, O_CLOEXEC | O_NONBLOCK);
556 }
557 #endif
558
559 static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_session *se)
560 {
561 struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
562 if (llp == NULL) {
563 int res;
564
565 llp = malloc(sizeof(struct fuse_ll_pipe));
566 if (llp == NULL)
567 return NULL;
568
569 res = fuse_pipe(llp->pipe);
570 if (res == -1) {
571 free(llp);
572 return NULL;
573 }
574
575 /*
576 *the default size is 16 pages on linux
577 */
578 llp->size = pagesize * 16;
579 llp->can_grow = 1;
580
581 pthread_setspecific(se->pipe_key, llp);
582 }
583
584 return llp;
585 }
586 #endif
587
588 static void fuse_ll_clear_pipe(struct fuse_session *se)
589 {
590 struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key);
591 if (llp) {
592 pthread_setspecific(se->pipe_key, NULL);
593 fuse_ll_pipe_free(llp);
594 }
595 }
596
597 #if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE)
598 static int read_back(int fd, char *buf, size_t len)
599 {
600 int res;
601
602 res = read(fd, buf, len);
603 if (res == -1) {
604 fprintf(stderr, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno));
605 return -EIO;
606 }
607 if (res != len) {
608 fprintf(stderr, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len);
609 return -EIO;
610 }
611 return 0;
612 }
613
614 static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
615 struct iovec *iov, int iov_count,
616 struct fuse_bufvec *buf, unsigned int flags)
617 {
618 int res;
619 size_t len = fuse_buf_size(buf);
620 struct fuse_out_header *out = iov[0].iov_base;
621 struct fuse_ll_pipe *llp;
622 int splice_flags;
623 size_t pipesize;
624 size_t total_fd_size;
625 size_t idx;
626 size_t headerlen;
627 struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len);
628
629 if (se->broken_splice_nonblock)
630 goto fallback;
631
632 if (flags & FUSE_BUF_NO_SPLICE)
633 goto fallback;
634
635 total_fd_size = 0;
636 for (idx = buf->idx; idx < buf->count; idx++) {
637 if (buf->buf[idx].flags & FUSE_BUF_IS_FD) {
638 total_fd_size = buf->buf[idx].size;
639 if (idx == buf->idx)
640 total_fd_size -= buf->off;
641 }
642 }
643 if (total_fd_size < 2 * pagesize)
644 goto fallback;
645
646 if (se->conn.proto_minor < 14 ||
647 !(se->conn.want & FUSE_CAP_SPLICE_WRITE))
648 goto fallback;
649
650 llp = fuse_ll_get_pipe(se);
651 if (llp == NULL)
652 goto fallback;
653
654
655 headerlen = iov_length(iov, iov_count);
656
657 out->len = headerlen + len;
658
659 /*
660 * Heuristic for the required pipe size, does not work if the
661 * source contains less than page size fragments
662 */
663 pipesize = pagesize * (iov_count + buf->count + 1) + out->len;
664
665 if (llp->size < pipesize) {
666 if (llp->can_grow) {
667 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize);
668 if (res == -1) {
669 llp->can_grow = 0;
670 goto fallback;
671 }
672 llp->size = res;
673 }
674 if (llp->size < pipesize)
675 goto fallback;
676 }
677
678
679 res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK);
680 if (res == -1)
681 goto fallback;
682
683 if (res != headerlen) {
684 res = -EIO;
685 fprintf(stderr, "fuse: short vmsplice to pipe: %u/%zu\n", res,
686 headerlen);
687 goto clear_pipe;
688 }
689
690 pipe_buf.buf[0].flags = FUSE_BUF_IS_FD;
691 pipe_buf.buf[0].fd = llp->pipe[1];
692
693 res = fuse_buf_copy(&pipe_buf, buf,
694 FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK);
695 if (res < 0) {
696 if (res == -EAGAIN || res == -EINVAL) {
697 /*
698 * Should only get EAGAIN on kernels with
699 * broken SPLICE_F_NONBLOCK support (<=
700 * 2.6.35) where this error or a short read is
701 * returned even if the pipe itself is not
702 * full
703 *
704 * EINVAL might mean that splice can't handle
705 * this combination of input and output.
706 */
707 if (res == -EAGAIN)
708 se->broken_splice_nonblock = 1;
709
710 pthread_setspecific(se->pipe_key, NULL);
711 fuse_ll_pipe_free(llp);
712 goto fallback;
713 }
714 res = -res;
715 goto clear_pipe;
716 }
717
718 if (res != 0 && res < len) {
719 struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
720 void *mbuf;
721 size_t now_len = res;
722 /*
723 * For regular files a short count is either
724 * 1) due to EOF, or
725 * 2) because of broken SPLICE_F_NONBLOCK (see above)
726 *
727 * For other inputs it's possible that we overflowed
728 * the pipe because of small buffer fragments.
729 */
730
731 res = posix_memalign(&mbuf, pagesize, len);
732 if (res != 0)
733 goto clear_pipe;
734
735 mem_buf.buf[0].mem = mbuf;
736 mem_buf.off = now_len;
737 res = fuse_buf_copy(&mem_buf, buf, 0);
738 if (res > 0) {
739 char *tmpbuf;
740 size_t extra_len = res;
741 /*
742 * Trickiest case: got more data. Need to get
743 * back the data from the pipe and then fall
744 * back to regular write.
745 */
746 tmpbuf = malloc(headerlen);
747 if (tmpbuf == NULL) {
748 free(mbuf);
749 res = ENOMEM;
750 goto clear_pipe;
751 }
752 res = read_back(llp->pipe[0], tmpbuf, headerlen);
753 free(tmpbuf);
754 if (res != 0) {
755 free(mbuf);
756 goto clear_pipe;
757 }
758 res = read_back(llp->pipe[0], mbuf, now_len);
759 if (res != 0) {
760 free(mbuf);
761 goto clear_pipe;
762 }
763 len = now_len + extra_len;
764 iov[iov_count].iov_base = mbuf;
765 iov[iov_count].iov_len = len;
766 iov_count++;
767 res = fuse_send_msg(se, ch, iov, iov_count);
768 free(mbuf);
769 return res;
770 }
771 free(mbuf);
772 res = now_len;
773 }
774 len = res;
775 out->len = headerlen + len;
776
777 if (se->debug) {
778 fprintf(stderr,
779 " unique: %llu, success, outsize: %i (splice)\n",
780 (unsigned long long) out->unique, out->len);
781 }
782
783 splice_flags = 0;
784 if ((flags & FUSE_BUF_SPLICE_MOVE) &&
785 (se->conn.want & FUSE_CAP_SPLICE_MOVE))
786 splice_flags |= SPLICE_F_MOVE;
787
788 res = splice(llp->pipe[0], NULL, ch ? ch->fd : se->fd,
789 NULL, out->len, splice_flags);
790 if (res == -1) {
791 res = -errno;
792 perror("fuse: splice from pipe");
793 goto clear_pipe;
794 }
795 if (res != out->len) {
796 res = -EIO;
797 fprintf(stderr, "fuse: short splice from pipe: %u/%u\n",
798 res, out->len);
799 goto clear_pipe;
800 }
801 return 0;
802
803 clear_pipe:
804 fuse_ll_clear_pipe(se);
805 return res;
806
807 fallback:
808 return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
809 }
810 #else
811 static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
812 struct iovec *iov, int iov_count,
813 struct fuse_bufvec *buf, unsigned int flags)
814 {
815 size_t len = fuse_buf_size(buf);
816 (void) flags;
817
818 return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len);
819 }
820 #endif
821
822 int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv,
823 enum fuse_buf_copy_flags flags)
824 {
825 struct iovec iov[2];
826 struct fuse_out_header out;
827 int res;
828
829 iov[0].iov_base = &out;
830 iov[0].iov_len = sizeof(struct fuse_out_header);
831
832 out.unique = req->unique;
833 out.error = 0;
834
835 res = fuse_send_data_iov(req->se, req->ch, iov, 1, bufv, flags);
836 if (res <= 0) {
837 fuse_free_req(req);
838 return res;
839 } else {
840 return fuse_reply_err(req, res);
841 }
842 }
843
844 int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
845 {
846 struct fuse_statfs_out arg;
847 size_t size = req->se->conn.proto_minor < 4 ?
848 FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
849
850 memset(&arg, 0, sizeof(arg));
851 convert_statfs(stbuf, &arg.st);
852
853 return send_reply_ok(req, &arg, size);
854 }
855
856 int fuse_reply_xattr(fuse_req_t req, size_t count)
857 {
858 struct fuse_getxattr_out arg;
859
860 memset(&arg, 0, sizeof(arg));
861 arg.size = count;
862
863 return send_reply_ok(req, &arg, sizeof(arg));
864 }
865
866 int fuse_reply_lock(fuse_req_t req, const struct flock *lock)
867 {
868 struct fuse_lk_out arg;
869
870 memset(&arg, 0, sizeof(arg));
871 arg.lk.type = lock->l_type;
872 if (lock->l_type != F_UNLCK) {
873 arg.lk.start = lock->l_start;
874 if (lock->l_len == 0)
875 arg.lk.end = OFFSET_MAX;
876 else
877 arg.lk.end = lock->l_start + lock->l_len - 1;
878 }
879 arg.lk.pid = lock->l_pid;
880 return send_reply_ok(req, &arg, sizeof(arg));
881 }
882
883 int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
884 {
885 struct fuse_bmap_out arg;
886
887 memset(&arg, 0, sizeof(arg));
888 arg.block = idx;
889
890 return send_reply_ok(req, &arg, sizeof(arg));
891 }
892
893 static struct fuse_ioctl_iovec *fuse_ioctl_iovec_copy(const struct iovec *iov,
894 size_t count)
895 {
896 struct fuse_ioctl_iovec *fiov;
897 size_t i;
898
899 fiov = malloc(sizeof(fiov[0]) * count);
900 if (!fiov)
901 return NULL;
902
903 for (i = 0; i < count; i++) {
904 fiov[i].base = (uintptr_t) iov[i].iov_base;
905 fiov[i].len = iov[i].iov_len;
906 }
907
908 return fiov;
909 }
910
911 int fuse_reply_ioctl_retry(fuse_req_t req,
912 const struct iovec *in_iov, size_t in_count,
913 const struct iovec *out_iov, size_t out_count)
914 {
915 struct fuse_ioctl_out arg;
916 struct fuse_ioctl_iovec *in_fiov = NULL;
917 struct fuse_ioctl_iovec *out_fiov = NULL;
918 struct iovec iov[4];
919 size_t count = 1;
920 int res;
921
922 memset(&arg, 0, sizeof(arg));
923 arg.flags |= FUSE_IOCTL_RETRY;
924 arg.in_iovs = in_count;
925 arg.out_iovs = out_count;
926 iov[count].iov_base = &arg;
927 iov[count].iov_len = sizeof(arg);
928 count++;
929
930 if (req->se->conn.proto_minor < 16) {
931 if (in_count) {
932 iov[count].iov_base = (void *)in_iov;
933 iov[count].iov_len = sizeof(in_iov[0]) * in_count;
934 count++;
935 }
936
937 if (out_count) {
938 iov[count].iov_base = (void *)out_iov;
939 iov[count].iov_len = sizeof(out_iov[0]) * out_count;
940 count++;
941 }
942 } else {
943 /* Can't handle non-compat 64bit ioctls on 32bit */
944 if (sizeof(void *) == 4 && req->ioctl_64bit) {
945 res = fuse_reply_err(req, EINVAL);
946 goto out;
947 }
948
949 if (in_count) {
950 in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
951 if (!in_fiov)
952 goto enomem;
953
954 iov[count].iov_base = (void *)in_fiov;
955 iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
956 count++;
957 }
958 if (out_count) {
959 out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
960 if (!out_fiov)
961 goto enomem;
962
963 iov[count].iov_base = (void *)out_fiov;
964 iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
965 count++;
966 }
967 }
968
969 res = send_reply_iov(req, 0, iov, count);
970 out:
971 free(in_fiov);
972 free(out_fiov);
973
974 return res;
975
976 enomem:
977 res = fuse_reply_err(req, ENOMEM);
978 goto out;
979 }
980
981 int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
982 {
983 struct fuse_ioctl_out arg;
984 struct iovec iov[3];
985 size_t count = 1;
986
987 memset(&arg, 0, sizeof(arg));
988 arg.result = result;
989 iov[count].iov_base = &arg;
990 iov[count].iov_len = sizeof(arg);
991 count++;
992
993 if (size) {
994 iov[count].iov_base = (char *) buf;
995 iov[count].iov_len = size;
996 count++;
997 }
998
999 return send_reply_iov(req, 0, iov, count);
1000 }
1001
1002 int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
1003 int count)
1004 {
1005 struct iovec *padded_iov;
1006 struct fuse_ioctl_out arg;
1007 int res;
1008
1009 padded_iov = malloc((count + 2) * sizeof(struct iovec));
1010 if (padded_iov == NULL)
1011 return fuse_reply_err(req, ENOMEM);
1012
1013 memset(&arg, 0, sizeof(arg));
1014 arg.result = result;
1015 padded_iov[1].iov_base = &arg;
1016 padded_iov[1].iov_len = sizeof(arg);
1017
1018 memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
1019
1020 res = send_reply_iov(req, 0, padded_iov, count + 2);
1021 free(padded_iov);
1022
1023 return res;
1024 }
1025
1026 int fuse_reply_poll(fuse_req_t req, unsigned revents)
1027 {
1028 struct fuse_poll_out arg;
1029
1030 memset(&arg, 0, sizeof(arg));
1031 arg.revents = revents;
1032
1033 return send_reply_ok(req, &arg, sizeof(arg));
1034 }
1035
1036 static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1037 {
1038 char *name = (char *) inarg;
1039
1040 if (req->se->op.lookup)
1041 req->se->op.lookup(req, nodeid, name);
1042 else
1043 fuse_reply_err(req, ENOSYS);
1044 }
1045
1046 static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1047 {
1048 struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;
1049
1050 if (req->se->op.forget)
1051 req->se->op.forget(req, nodeid, arg->nlookup);
1052 else
1053 fuse_reply_none(req);
1054 }
1055
1056 static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid,
1057 const void *inarg)
1058 {
1059 struct fuse_batch_forget_in *arg = (void *) inarg;
1060 struct fuse_forget_one *param = (void *) PARAM(arg);
1061 unsigned int i;
1062
1063 (void) nodeid;
1064
1065 if (req->se->op.forget_multi) {
1066 req->se->op.forget_multi(req, arg->count,
1067 (struct fuse_forget_data *) param);
1068 } else if (req->se->op.forget) {
1069 for (i = 0; i < arg->count; i++) {
1070 struct fuse_forget_one *forget = &param[i];
1071 struct fuse_req *dummy_req;
1072
1073 dummy_req = fuse_ll_alloc_req(req->se);
1074 if (dummy_req == NULL)
1075 break;
1076
1077 dummy_req->unique = req->unique;
1078 dummy_req->ctx = req->ctx;
1079 dummy_req->ch = NULL;
1080
1081 req->se->op.forget(dummy_req, forget->nodeid,
1082 forget->nlookup);
1083 }
1084 fuse_reply_none(req);
1085 } else {
1086 fuse_reply_none(req);
1087 }
1088 }
1089
1090 static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1091 {
1092 struct fuse_file_info *fip = NULL;
1093 struct fuse_file_info fi;
1094
1095 if (req->se->conn.proto_minor >= 9) {
1096 struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;
1097
1098 if (arg->getattr_flags & FUSE_GETATTR_FH) {
1099 memset(&fi, 0, sizeof(fi));
1100 fi.fh = arg->fh;
1101 fip = &fi;
1102 }
1103 }
1104
1105 if (req->se->op.getattr)
1106 req->se->op.getattr(req, nodeid, fip);
1107 else
1108 fuse_reply_err(req, ENOSYS);
1109 }
1110
1111 static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1112 {
1113 struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;
1114
1115 if (req->se->op.setattr) {
1116 struct fuse_file_info *fi = NULL;
1117 struct fuse_file_info fi_store;
1118 struct stat stbuf;
1119 memset(&stbuf, 0, sizeof(stbuf));
1120 convert_attr(arg, &stbuf);
1121 if (arg->valid & FATTR_FH) {
1122 arg->valid &= ~FATTR_FH;
1123 memset(&fi_store, 0, sizeof(fi_store));
1124 fi = &fi_store;
1125 fi->fh = arg->fh;
1126 }
1127 arg->valid &=
1128 FUSE_SET_ATTR_MODE |
1129 FUSE_SET_ATTR_UID |
1130 FUSE_SET_ATTR_GID |
1131 FUSE_SET_ATTR_SIZE |
1132 FUSE_SET_ATTR_ATIME |
1133 FUSE_SET_ATTR_MTIME |
1134 FUSE_SET_ATTR_ATIME_NOW |
1135 FUSE_SET_ATTR_MTIME_NOW |
1136 FUSE_SET_ATTR_CTIME;
1137
1138 req->se->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
1139 } else
1140 fuse_reply_err(req, ENOSYS);
1141 }
1142
1143 static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1144 {
1145 struct fuse_access_in *arg = (struct fuse_access_in *) inarg;
1146
1147 if (req->se->op.access)
1148 req->se->op.access(req, nodeid, arg->mask);
1149 else
1150 fuse_reply_err(req, ENOSYS);
1151 }
1152
1153 static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1154 {
1155 (void) inarg;
1156
1157 if (req->se->op.readlink)
1158 req->se->op.readlink(req, nodeid);
1159 else
1160 fuse_reply_err(req, ENOSYS);
1161 }
1162
1163 static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1164 {
1165 struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
1166 char *name = PARAM(arg);
1167
1168 if (req->se->conn.proto_minor >= 12)
1169 req->ctx.umask = arg->umask;
1170 else
1171 name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;
1172
1173 if (req->se->op.mknod)
1174 req->se->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
1175 else
1176 fuse_reply_err(req, ENOSYS);
1177 }
1178
1179 static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1180 {
1181 struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;
1182
1183 if (req->se->conn.proto_minor >= 12)
1184 req->ctx.umask = arg->umask;
1185
1186 if (req->se->op.mkdir)
1187 req->se->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
1188 else
1189 fuse_reply_err(req, ENOSYS);
1190 }
1191
1192 static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1193 {
1194 char *name = (char *) inarg;
1195
1196 if (req->se->op.unlink)
1197 req->se->op.unlink(req, nodeid, name);
1198 else
1199 fuse_reply_err(req, ENOSYS);
1200 }
1201
1202 static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1203 {
1204 char *name = (char *) inarg;
1205
1206 if (req->se->op.rmdir)
1207 req->se->op.rmdir(req, nodeid, name);
1208 else
1209 fuse_reply_err(req, ENOSYS);
1210 }
1211
1212 static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1213 {
1214 char *name = (char *) inarg;
1215 char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;
1216
1217 if (req->se->op.symlink)
1218 req->se->op.symlink(req, linkname, nodeid, name);
1219 else
1220 fuse_reply_err(req, ENOSYS);
1221 }
1222
1223 static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1224 {
1225 struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
1226 char *oldname = PARAM(arg);
1227 char *newname = oldname + strlen(oldname) + 1;
1228
1229 if (req->se->op.rename)
1230 req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
1231 0);
1232 else
1233 fuse_reply_err(req, ENOSYS);
1234 }
1235
1236 static void do_rename2(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1237 {
1238 struct fuse_rename2_in *arg = (struct fuse_rename2_in *) inarg;
1239 char *oldname = PARAM(arg);
1240 char *newname = oldname + strlen(oldname) + 1;
1241
1242 if (req->se->op.rename)
1243 req->se->op.rename(req, nodeid, oldname, arg->newdir, newname,
1244 arg->flags);
1245 else
1246 fuse_reply_err(req, ENOSYS);
1247 }
1248
1249 static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1250 {
1251 struct fuse_link_in *arg = (struct fuse_link_in *) inarg;
1252
1253 if (req->se->op.link)
1254 req->se->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
1255 else
1256 fuse_reply_err(req, ENOSYS);
1257 }
1258
1259 static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1260 {
1261 struct fuse_create_in *arg = (struct fuse_create_in *) inarg;
1262
1263 if (req->se->op.create) {
1264 struct fuse_file_info fi;
1265 char *name = PARAM(arg);
1266
1267 memset(&fi, 0, sizeof(fi));
1268 fi.flags = arg->flags;
1269
1270 if (req->se->conn.proto_minor >= 12)
1271 req->ctx.umask = arg->umask;
1272 else
1273 name = (char *) inarg + sizeof(struct fuse_open_in);
1274
1275 req->se->op.create(req, nodeid, name, arg->mode, &fi);
1276 } else
1277 fuse_reply_err(req, ENOSYS);
1278 }
1279
1280 static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1281 {
1282 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1283 struct fuse_file_info fi;
1284
1285 memset(&fi, 0, sizeof(fi));
1286 fi.flags = arg->flags;
1287
1288 if (req->se->op.open)
1289 req->se->op.open(req, nodeid, &fi);
1290 else
1291 fuse_reply_open(req, &fi);
1292 }
1293
1294 static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1295 {
1296 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1297
1298 if (req->se->op.read) {
1299 struct fuse_file_info fi;
1300
1301 memset(&fi, 0, sizeof(fi));
1302 fi.fh = arg->fh;
1303 if (req->se->conn.proto_minor >= 9) {
1304 fi.lock_owner = arg->lock_owner;
1305 fi.flags = arg->flags;
1306 }
1307 req->se->op.read(req, nodeid, arg->size, arg->offset, &fi);
1308 } else
1309 fuse_reply_err(req, ENOSYS);
1310 }
1311
1312 static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1313 {
1314 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1315 struct fuse_file_info fi;
1316 char *param;
1317
1318 memset(&fi, 0, sizeof(fi));
1319 fi.fh = arg->fh;
1320 fi.writepage = (arg->write_flags & FUSE_WRITE_CACHE) != 0;
1321
1322 if (req->se->conn.proto_minor < 9) {
1323 param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1324 } else {
1325 fi.lock_owner = arg->lock_owner;
1326 fi.flags = arg->flags;
1327 param = PARAM(arg);
1328 }
1329
1330 if (req->se->op.write)
1331 req->se->op.write(req, nodeid, param, arg->size,
1332 arg->offset, &fi);
1333 else
1334 fuse_reply_err(req, ENOSYS);
1335 }
1336
1337 static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,
1338 const struct fuse_buf *ibuf)
1339 {
1340 struct fuse_session *se = req->se;
1341 struct fuse_bufvec bufv = {
1342 .buf[0] = *ibuf,
1343 .count = 1,
1344 };
1345 struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
1346 struct fuse_file_info fi;
1347
1348 memset(&fi, 0, sizeof(fi));
1349 fi.fh = arg->fh;
1350 fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;
1351
1352 if (se->conn.proto_minor < 9) {
1353 bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
1354 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1355 FUSE_COMPAT_WRITE_IN_SIZE;
1356 assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD));
1357 } else {
1358 fi.lock_owner = arg->lock_owner;
1359 fi.flags = arg->flags;
1360 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
1361 bufv.buf[0].mem = PARAM(arg);
1362
1363 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
1364 sizeof(struct fuse_write_in);
1365 }
1366 if (bufv.buf[0].size < arg->size) {
1367 fprintf(stderr, "fuse: do_write_buf: buffer size too small\n");
1368 fuse_reply_err(req, EIO);
1369 goto out;
1370 }
1371 bufv.buf[0].size = arg->size;
1372
1373 se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi);
1374
1375 out:
1376 /* Need to reset the pipe if ->write_buf() didn't consume all data */
1377 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
1378 fuse_ll_clear_pipe(se);
1379 }
1380
1381 static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1382 {
1383 struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
1384 struct fuse_file_info fi;
1385
1386 memset(&fi, 0, sizeof(fi));
1387 fi.fh = arg->fh;
1388 fi.flush = 1;
1389 if (req->se->conn.proto_minor >= 7)
1390 fi.lock_owner = arg->lock_owner;
1391
1392 if (req->se->op.flush)
1393 req->se->op.flush(req, nodeid, &fi);
1394 else
1395 fuse_reply_err(req, ENOSYS);
1396 }
1397
1398 static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1399 {
1400 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1401 struct fuse_file_info fi;
1402
1403 memset(&fi, 0, sizeof(fi));
1404 fi.flags = arg->flags;
1405 fi.fh = arg->fh;
1406 if (req->se->conn.proto_minor >= 8) {
1407 fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
1408 fi.lock_owner = arg->lock_owner;
1409 }
1410 if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) {
1411 fi.flock_release = 1;
1412 fi.lock_owner = arg->lock_owner;
1413 }
1414
1415 if (req->se->op.release)
1416 req->se->op.release(req, nodeid, &fi);
1417 else
1418 fuse_reply_err(req, 0);
1419 }
1420
1421 static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1422 {
1423 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1424 struct fuse_file_info fi;
1425 int datasync = arg->fsync_flags & 1;
1426
1427 memset(&fi, 0, sizeof(fi));
1428 fi.fh = arg->fh;
1429
1430 if (req->se->op.fsync)
1431 req->se->op.fsync(req, nodeid, datasync, &fi);
1432 else
1433 fuse_reply_err(req, ENOSYS);
1434 }
1435
1436 static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1437 {
1438 struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
1439 struct fuse_file_info fi;
1440
1441 memset(&fi, 0, sizeof(fi));
1442 fi.flags = arg->flags;
1443
1444 if (req->se->op.opendir)
1445 req->se->op.opendir(req, nodeid, &fi);
1446 else
1447 fuse_reply_open(req, &fi);
1448 }
1449
1450 static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1451 {
1452 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1453 struct fuse_file_info fi;
1454
1455 memset(&fi, 0, sizeof(fi));
1456 fi.fh = arg->fh;
1457
1458 if (req->se->op.readdir)
1459 req->se->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
1460 else
1461 fuse_reply_err(req, ENOSYS);
1462 }
1463
1464 static void do_readdirplus(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1465 {
1466 struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
1467 struct fuse_file_info fi;
1468
1469 memset(&fi, 0, sizeof(fi));
1470 fi.fh = arg->fh;
1471
1472 if (req->se->op.readdirplus)
1473 req->se->op.readdirplus(req, nodeid, arg->size, arg->offset, &fi);
1474 else
1475 fuse_reply_err(req, ENOSYS);
1476 }
1477
1478 static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1479 {
1480 struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
1481 struct fuse_file_info fi;
1482
1483 memset(&fi, 0, sizeof(fi));
1484 fi.flags = arg->flags;
1485 fi.fh = arg->fh;
1486
1487 if (req->se->op.releasedir)
1488 req->se->op.releasedir(req, nodeid, &fi);
1489 else
1490 fuse_reply_err(req, 0);
1491 }
1492
1493 static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1494 {
1495 struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
1496 struct fuse_file_info fi;
1497 int datasync = arg->fsync_flags & 1;
1498
1499 memset(&fi, 0, sizeof(fi));
1500 fi.fh = arg->fh;
1501
1502 if (req->se->op.fsyncdir)
1503 req->se->op.fsyncdir(req, nodeid, datasync, &fi);
1504 else
1505 fuse_reply_err(req, ENOSYS);
1506 }
1507
1508 static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1509 {
1510 (void) nodeid;
1511 (void) inarg;
1512
1513 if (req->se->op.statfs)
1514 req->se->op.statfs(req, nodeid);
1515 else {
1516 struct statvfs buf = {
1517 .f_namemax = 255,
1518 .f_bsize = 512,
1519 };
1520 fuse_reply_statfs(req, &buf);
1521 }
1522 }
1523
1524 static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1525 {
1526 struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
1527 char *name = PARAM(arg);
1528 char *value = name + strlen(name) + 1;
1529
1530 if (req->se->op.setxattr)
1531 req->se->op.setxattr(req, nodeid, name, value, arg->size,
1532 arg->flags);
1533 else
1534 fuse_reply_err(req, ENOSYS);
1535 }
1536
1537 static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1538 {
1539 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1540
1541 if (req->se->op.getxattr)
1542 req->se->op.getxattr(req, nodeid, PARAM(arg), arg->size);
1543 else
1544 fuse_reply_err(req, ENOSYS);
1545 }
1546
1547 static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1548 {
1549 struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;
1550
1551 if (req->se->op.listxattr)
1552 req->se->op.listxattr(req, nodeid, arg->size);
1553 else
1554 fuse_reply_err(req, ENOSYS);
1555 }
1556
1557 static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1558 {
1559 char *name = (char *) inarg;
1560
1561 if (req->se->op.removexattr)
1562 req->se->op.removexattr(req, nodeid, name);
1563 else
1564 fuse_reply_err(req, ENOSYS);
1565 }
1566
1567 static void convert_fuse_file_lock(struct fuse_file_lock *fl,
1568 struct flock *flock)
1569 {
1570 memset(flock, 0, sizeof(struct flock));
1571 flock->l_type = fl->type;
1572 flock->l_whence = SEEK_SET;
1573 flock->l_start = fl->start;
1574 if (fl->end == OFFSET_MAX)
1575 flock->l_len = 0;
1576 else
1577 flock->l_len = fl->end - fl->start + 1;
1578 flock->l_pid = fl->pid;
1579 }
1580
1581 static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1582 {
1583 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1584 struct fuse_file_info fi;
1585 struct flock flock;
1586
1587 memset(&fi, 0, sizeof(fi));
1588 fi.fh = arg->fh;
1589 fi.lock_owner = arg->owner;
1590
1591 convert_fuse_file_lock(&arg->lk, &flock);
1592 if (req->se->op.getlk)
1593 req->se->op.getlk(req, nodeid, &fi, &flock);
1594 else
1595 fuse_reply_err(req, ENOSYS);
1596 }
1597
1598 static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
1599 const void *inarg, int sleep)
1600 {
1601 struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
1602 struct fuse_file_info fi;
1603 struct flock flock;
1604
1605 memset(&fi, 0, sizeof(fi));
1606 fi.fh = arg->fh;
1607 fi.lock_owner = arg->owner;
1608
1609 if (arg->lk_flags & FUSE_LK_FLOCK) {
1610 int op = 0;
1611
1612 switch (arg->lk.type) {
1613 case F_RDLCK:
1614 op = LOCK_SH;
1615 break;
1616 case F_WRLCK:
1617 op = LOCK_EX;
1618 break;
1619 case F_UNLCK:
1620 op = LOCK_UN;
1621 break;
1622 }
1623 if (!sleep)
1624 op |= LOCK_NB;
1625
1626 if (req->se->op.flock)
1627 req->se->op.flock(req, nodeid, &fi, op);
1628 else
1629 fuse_reply_err(req, ENOSYS);
1630 } else {
1631 convert_fuse_file_lock(&arg->lk, &flock);
1632 if (req->se->op.setlk)
1633 req->se->op.setlk(req, nodeid, &fi, &flock, sleep);
1634 else
1635 fuse_reply_err(req, ENOSYS);
1636 }
1637 }
1638
1639 static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1640 {
1641 do_setlk_common(req, nodeid, inarg, 0);
1642 }
1643
1644 static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1645 {
1646 do_setlk_common(req, nodeid, inarg, 1);
1647 }
1648
1649 static int find_interrupted(struct fuse_session *se, struct fuse_req *req)
1650 {
1651 struct fuse_req *curr;
1652
1653 for (curr = se->list.next; curr != &se->list; curr = curr->next) {
1654 if (curr->unique == req->u.i.unique) {
1655 fuse_interrupt_func_t func;
1656 void *data;
1657
1658 curr->ctr++;
1659 pthread_mutex_unlock(&se->lock);
1660
1661 /* Ugh, ugly locking */
1662 pthread_mutex_lock(&curr->lock);
1663 pthread_mutex_lock(&se->lock);
1664 curr->interrupted = 1;
1665 func = curr->u.ni.func;
1666 data = curr->u.ni.data;
1667 pthread_mutex_unlock(&se->lock);
1668 if (func)
1669 func(curr, data);
1670 pthread_mutex_unlock(&curr->lock);
1671
1672 pthread_mutex_lock(&se->lock);
1673 curr->ctr--;
1674 if (!curr->ctr)
1675 destroy_req(curr);
1676
1677 return 1;
1678 }
1679 }
1680 for (curr = se->interrupts.next; curr != &se->interrupts;
1681 curr = curr->next) {
1682 if (curr->u.i.unique == req->u.i.unique)
1683 return 1;
1684 }
1685 return 0;
1686 }
1687
1688 static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1689 {
1690 struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
1691 struct fuse_session *se = req->se;
1692
1693 (void) nodeid;
1694 if (se->debug)
1695 fprintf(stderr, "INTERRUPT: %llu\n",
1696 (unsigned long long) arg->unique);
1697
1698 req->u.i.unique = arg->unique;
1699
1700 pthread_mutex_lock(&se->lock);
1701 if (find_interrupted(se, req))
1702 destroy_req(req);
1703 else
1704 list_add_req(req, &se->interrupts);
1705 pthread_mutex_unlock(&se->lock);
1706 }
1707
1708 static struct fuse_req *check_interrupt(struct fuse_session *se,
1709 struct fuse_req *req)
1710 {
1711 struct fuse_req *curr;
1712
1713 for (curr = se->interrupts.next; curr != &se->interrupts;
1714 curr = curr->next) {
1715 if (curr->u.i.unique == req->unique) {
1716 req->interrupted = 1;
1717 list_del_req(curr);
1718 free(curr);
1719 return NULL;
1720 }
1721 }
1722 curr = se->interrupts.next;
1723 if (curr != &se->interrupts) {
1724 list_del_req(curr);
1725 list_init_req(curr);
1726 return curr;
1727 } else
1728 return NULL;
1729 }
1730
1731 static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1732 {
1733 struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;
1734
1735 if (req->se->op.bmap)
1736 req->se->op.bmap(req, nodeid, arg->blocksize, arg->block);
1737 else
1738 fuse_reply_err(req, ENOSYS);
1739 }
1740
1741 static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1742 {
1743 struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
1744 unsigned int flags = arg->flags;
1745 void *in_buf = arg->in_size ? PARAM(arg) : NULL;
1746 struct fuse_file_info fi;
1747
1748 if (flags & FUSE_IOCTL_DIR &&
1749 !(req->se->conn.want & FUSE_CAP_IOCTL_DIR)) {
1750 fuse_reply_err(req, ENOTTY);
1751 return;
1752 }
1753
1754 memset(&fi, 0, sizeof(fi));
1755 fi.fh = arg->fh;
1756
1757 if (sizeof(void *) == 4 && req->se->conn.proto_minor >= 16 &&
1758 !(flags & FUSE_IOCTL_32BIT)) {
1759 req->ioctl_64bit = 1;
1760 }
1761
1762 if (req->se->op.ioctl)
1763 req->se->op.ioctl(req, nodeid, arg->cmd,
1764 (void *)(uintptr_t)arg->arg, &fi, flags,
1765 in_buf, arg->in_size, arg->out_size);
1766 else
1767 fuse_reply_err(req, ENOSYS);
1768 }
1769
1770 void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
1771 {
1772 free(ph);
1773 }
1774
1775 static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1776 {
1777 struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
1778 struct fuse_file_info fi;
1779
1780 memset(&fi, 0, sizeof(fi));
1781 fi.fh = arg->fh;
1782 fi.poll_events = arg->events;
1783
1784 if (req->se->op.poll) {
1785 struct fuse_pollhandle *ph = NULL;
1786
1787 if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
1788 ph = malloc(sizeof(struct fuse_pollhandle));
1789 if (ph == NULL) {
1790 fuse_reply_err(req, ENOMEM);
1791 return;
1792 }
1793 ph->kh = arg->kh;
1794 ph->se = req->se;
1795 }
1796
1797 req->se->op.poll(req, nodeid, &fi, ph);
1798 } else {
1799 fuse_reply_err(req, ENOSYS);
1800 }
1801 }
1802
1803 static void do_fallocate(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1804 {
1805 struct fuse_fallocate_in *arg = (struct fuse_fallocate_in *) inarg;
1806 struct fuse_file_info fi;
1807
1808 memset(&fi, 0, sizeof(fi));
1809 fi.fh = arg->fh;
1810
1811 if (req->se->op.fallocate)
1812 req->se->op.fallocate(req, nodeid, arg->mode, arg->offset, arg->length, &fi);
1813 else
1814 fuse_reply_err(req, ENOSYS);
1815 }
1816
1817 static void do_copy_file_range(fuse_req_t req, fuse_ino_t nodeid_in, const void *inarg)
1818 {
1819 struct fuse_copy_file_range_in *arg = (struct fuse_copy_file_range_in *) inarg;
1820 struct fuse_file_info fi_in, fi_out;
1821
1822 memset(&fi_in, 0, sizeof(fi_in));
1823 fi_in.fh = arg->fh_in;
1824
1825 memset(&fi_out, 0, sizeof(fi_out));
1826 fi_out.fh = arg->fh_out;
1827
1828
1829 if (req->se->op.copy_file_range)
1830 req->se->op.copy_file_range(req, nodeid_in, arg->off_in,
1831 &fi_in, arg->nodeid_out,
1832 arg->off_out, &fi_out, arg->len,
1833 arg->flags);
1834 else
1835 fuse_reply_err(req, ENOSYS);
1836 }
1837
1838 static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
1839 {
1840 struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
1841 struct fuse_init_out outarg;
1842 struct fuse_session *se = req->se;
1843 size_t bufsize = se->bufsize;
1844 size_t outargsize = sizeof(outarg);
1845
1846 (void) nodeid;
1847 if (se->debug) {
1848 fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
1849 if (arg->major == 7 && arg->minor >= 6) {
1850 fprintf(stderr, "flags=0x%08x\n", arg->flags);
1851 fprintf(stderr, "max_readahead=0x%08x\n",
1852 arg->max_readahead);
1853 }
1854 }
1855 se->conn.proto_major = arg->major;
1856 se->conn.proto_minor = arg->minor;
1857 se->conn.capable = 0;
1858 se->conn.want = 0;
1859
1860 memset(&outarg, 0, sizeof(outarg));
1861 outarg.major = FUSE_KERNEL_VERSION;
1862 outarg.minor = FUSE_KERNEL_MINOR_VERSION;
1863
1864 if (arg->major < 7) {
1865 fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
1866 arg->major, arg->minor);
1867 fuse_reply_err(req, EPROTO);
1868 return;
1869 }
1870
1871 if (arg->major > 7) {
1872 /* Wait for a second INIT request with a 7.X version */
1873 send_reply_ok(req, &outarg, sizeof(outarg));
1874 return;
1875 }
1876
1877 if (arg->minor >= 6) {
1878 if (arg->max_readahead < se->conn.max_readahead)
1879 se->conn.max_readahead = arg->max_readahead;
1880 if (arg->flags & FUSE_ASYNC_READ)
1881 se->conn.capable |= FUSE_CAP_ASYNC_READ;
1882 if (arg->flags & FUSE_POSIX_LOCKS)
1883 se->conn.capable |= FUSE_CAP_POSIX_LOCKS;
1884 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
1885 se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
1886 if (arg->flags & FUSE_EXPORT_SUPPORT)
1887 se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
1888 if (arg->flags & FUSE_DONT_MASK)
1889 se->conn.capable |= FUSE_CAP_DONT_MASK;
1890 if (arg->flags & FUSE_FLOCK_LOCKS)
1891 se->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
1892 if (arg->flags & FUSE_AUTO_INVAL_DATA)
1893 se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA;
1894 if (arg->flags & FUSE_DO_READDIRPLUS)
1895 se->conn.capable |= FUSE_CAP_READDIRPLUS;
1896 if (arg->flags & FUSE_READDIRPLUS_AUTO)
1897 se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO;
1898 if (arg->flags & FUSE_ASYNC_DIO)
1899 se->conn.capable |= FUSE_CAP_ASYNC_DIO;
1900 if (arg->flags & FUSE_WRITEBACK_CACHE)
1901 se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE;
1902 if (arg->flags & FUSE_NO_OPEN_SUPPORT)
1903 se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT;
1904 if (arg->flags & FUSE_PARALLEL_DIROPS)
1905 se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS;
1906 if (arg->flags & FUSE_POSIX_ACL)
1907 se->conn.capable |= FUSE_CAP_POSIX_ACL;
1908 if (arg->flags & FUSE_HANDLE_KILLPRIV)
1909 se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV;
1910 if (arg->flags & FUSE_NO_OPENDIR_SUPPORT)
1911 se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT;
1912 } else {
1913 se->conn.max_readahead = 0;
1914 }
1915
1916 if (se->conn.proto_minor >= 14) {
1917 #ifdef HAVE_SPLICE
1918 #ifdef HAVE_VMSPLICE
1919 se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;
1920 #endif
1921 se->conn.capable |= FUSE_CAP_SPLICE_READ;
1922 #endif
1923 }
1924 if (se->conn.proto_minor >= 18)
1925 se->conn.capable |= FUSE_CAP_IOCTL_DIR;
1926
1927 /* Default settings for modern filesystems.
1928 *
1929 * Most of these capabilities were disabled by default in
1930 * libfuse2 for backwards compatibility reasons. In libfuse3,
1931 * we can finally enable them by default (as long as they're
1932 * supported by the kernel).
1933 */
1934 #define LL_SET_DEFAULT(cond, cap) \
1935 if ((cond) && (se->conn.capable & (cap))) \
1936 se->conn.want |= (cap)
1937 LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_READ);
1938 LL_SET_DEFAULT(1, FUSE_CAP_PARALLEL_DIROPS);
1939 LL_SET_DEFAULT(1, FUSE_CAP_AUTO_INVAL_DATA);
1940 LL_SET_DEFAULT(1, FUSE_CAP_HANDLE_KILLPRIV);
1941 LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_DIO);
1942 LL_SET_DEFAULT(1, FUSE_CAP_IOCTL_DIR);
1943 LL_SET_DEFAULT(1, FUSE_CAP_ATOMIC_O_TRUNC);
1944 LL_SET_DEFAULT(se->op.write_buf, FUSE_CAP_SPLICE_READ);
1945 LL_SET_DEFAULT(se->op.getlk && se->op.setlk,
1946 FUSE_CAP_POSIX_LOCKS);
1947 LL_SET_DEFAULT(se->op.flock, FUSE_CAP_FLOCK_LOCKS);
1948 LL_SET_DEFAULT(se->op.readdirplus, FUSE_CAP_READDIRPLUS);
1949 LL_SET_DEFAULT(se->op.readdirplus && se->op.readdir,
1950 FUSE_CAP_READDIRPLUS_AUTO);
1951 se->conn.time_gran = 1;
1952
1953 if (bufsize < FUSE_MIN_READ_BUFFER) {
1954 fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
1955 bufsize);
1956 bufsize = FUSE_MIN_READ_BUFFER;
1957 }
1958
1959 bufsize -= 4096;
1960 if (bufsize < se->conn.max_write)
1961 se->conn.max_write = bufsize;
1962
1963 se->got_init = 1;
1964 if (se->op.init)
1965 se->op.init(se->userdata, &se->conn);
1966
1967 if (se->conn.want & (~se->conn.capable)) {
1968 fprintf(stderr, "fuse: error: filesystem requested capabilities "
1969 "0x%x that are not supported by kernel, aborting.\n",
1970 se->conn.want & (~se->conn.capable));
1971 fuse_reply_err(req, EPROTO);
1972 se->error = -EPROTO;
1973 fuse_session_exit(se);
1974 return;
1975 }
1976
1977 unsigned max_read_mo = get_max_read(se->mo);
1978 if (se->conn.max_read != max_read_mo) {
1979 fprintf(stderr, "fuse: error: init() and fuse_session_new() "
1980 "requested different maximum read size (%u vs %u)\n",
1981 se->conn.max_read, max_read_mo);
1982 fuse_reply_err(req, EPROTO);
1983 se->error = -EPROTO;
1984 fuse_session_exit(se);
1985 return;
1986 }
1987
1988 /* Always enable big writes, this is superseded
1989 by the max_write option */
1990 outarg.flags |= FUSE_BIG_WRITES;
1991
1992 if (se->conn.want & FUSE_CAP_ASYNC_READ)
1993 outarg.flags |= FUSE_ASYNC_READ;
1994 if (se->conn.want & FUSE_CAP_POSIX_LOCKS)
1995 outarg.flags |= FUSE_POSIX_LOCKS;
1996 if (se->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
1997 outarg.flags |= FUSE_ATOMIC_O_TRUNC;
1998 if (se->conn.want & FUSE_CAP_EXPORT_SUPPORT)
1999 outarg.flags |= FUSE_EXPORT_SUPPORT;
2000 if (se->conn.want & FUSE_CAP_DONT_MASK)
2001 outarg.flags |= FUSE_DONT_MASK;
2002 if (se->conn.want & FUSE_CAP_FLOCK_LOCKS)
2003 outarg.flags |= FUSE_FLOCK_LOCKS;
2004 if (se->conn.want & FUSE_CAP_AUTO_INVAL_DATA)
2005 outarg.flags |= FUSE_AUTO_INVAL_DATA;
2006 if (se->conn.want & FUSE_CAP_READDIRPLUS)
2007 outarg.flags |= FUSE_DO_READDIRPLUS;
2008 if (se->conn.want & FUSE_CAP_READDIRPLUS_AUTO)
2009 outarg.flags |= FUSE_READDIRPLUS_AUTO;
2010 if (se->conn.want & FUSE_CAP_ASYNC_DIO)
2011 outarg.flags |= FUSE_ASYNC_DIO;
2012 if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE)
2013 outarg.flags |= FUSE_WRITEBACK_CACHE;
2014 if (se->conn.want & FUSE_CAP_POSIX_ACL)
2015 outarg.flags |= FUSE_POSIX_ACL;
2016 outarg.max_readahead = se->conn.max_readahead;
2017 outarg.max_write = se->conn.max_write;
2018 if (se->conn.proto_minor >= 13) {
2019 if (se->conn.max_background >= (1 << 16))
2020 se->conn.max_background = (1 << 16) - 1;
2021 if (se->conn.congestion_threshold > se->conn.max_background)
2022 se->conn.congestion_threshold = se->conn.max_background;
2023 if (!se->conn.congestion_threshold) {
2024 se->conn.congestion_threshold =
2025 se->conn.max_background * 3 / 4;
2026 }
2027
2028 outarg.max_background = se->conn.max_background;
2029 outarg.congestion_threshold = se->conn.congestion_threshold;
2030 }
2031 if (se->conn.proto_minor >= 23)
2032 outarg.time_gran = se->conn.time_gran;
2033
2034 if (se->debug) {
2035 fprintf(stderr, " INIT: %u.%u\n", outarg.major, outarg.minor);
2036 fprintf(stderr, " flags=0x%08x\n", outarg.flags);
2037 fprintf(stderr, " max_readahead=0x%08x\n",
2038 outarg.max_readahead);
2039 fprintf(stderr, " max_write=0x%08x\n", outarg.max_write);
2040 fprintf(stderr, " max_background=%i\n",
2041 outarg.max_background);
2042 fprintf(stderr, " congestion_threshold=%i\n",
2043 outarg.congestion_threshold);
2044 fprintf(stderr, " time_gran=%u\n",
2045 outarg.time_gran);
2046 }
2047 if (arg->minor < 5)
2048 outargsize = FUSE_COMPAT_INIT_OUT_SIZE;
2049 else if (arg->minor < 23)
2050 outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE;
2051
2052 send_reply_ok(req, &outarg, outargsize);
2053 }
2054
2055 static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
2056 {
2057 struct fuse_session *se = req->se;
2058
2059 (void) nodeid;
2060 (void) inarg;
2061
2062 se->got_destroy = 1;
2063 if (se->op.destroy)
2064 se->op.destroy(se->userdata);
2065
2066 send_reply_ok(req, NULL, 0);
2067 }
2068
2069 static void list_del_nreq(struct fuse_notify_req *nreq)
2070 {
2071 struct fuse_notify_req *prev = nreq->prev;
2072 struct fuse_notify_req *next = nreq->next;
2073 prev->next = next;
2074 next->prev = prev;
2075 }
2076
2077 static void list_add_nreq(struct fuse_notify_req *nreq,
2078 struct fuse_notify_req *next)
2079 {
2080 struct fuse_notify_req *prev = next->prev;
2081 nreq->next = next;
2082 nreq->prev = prev;
2083 prev->next = nreq;
2084 next->prev = nreq;
2085 }
2086
2087 static void list_init_nreq(struct fuse_notify_req *nreq)
2088 {
2089 nreq->next = nreq;
2090 nreq->prev = nreq;
2091 }
2092
2093 static void do_notify_reply(fuse_req_t req, fuse_ino_t nodeid,
2094 const void *inarg, const struct fuse_buf *buf)
2095 {
2096 struct fuse_session *se = req->se;
2097 struct fuse_notify_req *nreq;
2098 struct fuse_notify_req *head;
2099
2100 pthread_mutex_lock(&se->lock);
2101 head = &se->notify_list;
2102 for (nreq = head->next; nreq != head; nreq = nreq->next) {
2103 if (nreq->unique == req->unique) {
2104 list_del_nreq(nreq);
2105 break;
2106 }
2107 }
2108 pthread_mutex_unlock(&se->lock);
2109
2110 if (nreq != head)
2111 nreq->reply(nreq, req, nodeid, inarg, buf);
2112 }
2113
2114 static int send_notify_iov(struct fuse_session *se, int notify_code,
2115 struct iovec *iov, int count)
2116 {
2117 struct fuse_out_header out;
2118
2119 if (!se->got_init)
2120 return -ENOTCONN;
2121
2122 out.unique = 0;
2123 out.error = notify_code;
2124 iov[0].iov_base = &out;
2125 iov[0].iov_len = sizeof(struct fuse_out_header);
2126
2127 return fuse_send_msg(se, NULL, iov, count);
2128 }
2129
2130 int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
2131 {
2132 if (ph != NULL) {
2133 struct fuse_notify_poll_wakeup_out outarg;
2134 struct iovec iov[2];
2135
2136 outarg.kh = ph->kh;
2137
2138 iov[1].iov_base = &outarg;
2139 iov[1].iov_len = sizeof(outarg);
2140
2141 return send_notify_iov(ph->se, FUSE_NOTIFY_POLL, iov, 2);
2142 } else {
2143 return 0;
2144 }
2145 }
2146
2147 int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,
2148 off_t off, off_t len)
2149 {
2150 struct fuse_notify_inval_inode_out outarg;
2151 struct iovec iov[2];
2152
2153 if (!se)
2154 return -EINVAL;
2155
2156 if (se->conn.proto_major < 6 || se->conn.proto_minor < 12)
2157 return -ENOSYS;
2158
2159 outarg.ino = ino;
2160 outarg.off = off;
2161 outarg.len = len;
2162
2163 iov[1].iov_base = &outarg;
2164 iov[1].iov_len = sizeof(outarg);
2165
2166 return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2);
2167 }
2168
2169 int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
2170 const char *name, size_t namelen)
2171 {
2172 struct fuse_notify_inval_entry_out outarg;
2173 struct iovec iov[3];
2174
2175 if (!se)
2176 return -EINVAL;
2177
2178 if (se->conn.proto_major < 6 || se->conn.proto_minor < 12)
2179 return -ENOSYS;
2180
2181 outarg.parent = parent;
2182 outarg.namelen = namelen;
2183 outarg.padding = 0;
2184
2185 iov[1].iov_base = &outarg;
2186 iov[1].iov_len = sizeof(outarg);
2187 iov[2].iov_base = (void *)name;
2188 iov[2].iov_len = namelen + 1;
2189
2190 return send_notify_iov(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
2191 }
2192
2193 int fuse_lowlevel_notify_delete(struct fuse_session *se,
2194 fuse_ino_t parent, fuse_ino_t child,
2195 const char *name, size_t namelen)
2196 {
2197 struct fuse_notify_delete_out outarg;
2198 struct iovec iov[3];
2199
2200 if (!se)
2201 return -EINVAL;
2202
2203 if (se->conn.proto_major < 6 || se->conn.proto_minor < 18)
2204 return -ENOSYS;
2205
2206 outarg.parent = parent;
2207 outarg.child = child;
2208 outarg.namelen = namelen;
2209 outarg.padding = 0;
2210
2211 iov[1].iov_base = &outarg;
2212 iov[1].iov_len = sizeof(outarg);
2213 iov[2].iov_base = (void *)name;
2214 iov[2].iov_len = namelen + 1;
2215
2216 return send_notify_iov(se, FUSE_NOTIFY_DELETE, iov, 3);
2217 }
2218
2219 int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino,
2220 off_t offset, struct fuse_bufvec *bufv,
2221 enum fuse_buf_copy_flags flags)
2222 {
2223 struct fuse_out_header out;
2224 struct fuse_notify_store_out outarg;
2225 struct iovec iov[3];
2226 size_t size = fuse_buf_size(bufv);
2227 int res;
2228
2229 if (!se)
2230 return -EINVAL;
2231
2232 if (se->conn.proto_major < 6 || se->conn.proto_minor < 15)
2233 return -ENOSYS;
2234
2235 out.unique = 0;
2236 out.error = FUSE_NOTIFY_STORE;
2237
2238 outarg.nodeid = ino;
2239 outarg.offset = offset;
2240 outarg.size = size;
2241 outarg.padding = 0;
2242
2243 iov[0].iov_base = &out;
2244 iov[0].iov_len = sizeof(out);
2245 iov[1].iov_base = &outarg;
2246 iov[1].iov_len = sizeof(outarg);
2247
2248 res = fuse_send_data_iov(se, NULL, iov, 2, bufv, flags);
2249 if (res > 0)
2250 res = -res;
2251
2252 return res;
2253 }
2254
2255 struct fuse_retrieve_req {
2256 struct fuse_notify_req nreq;
2257 void *cookie;
2258 };
2259
2260 static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
2261 fuse_req_t req, fuse_ino_t ino,
2262 const void *inarg,
2263 const struct fuse_buf *ibuf)
2264 {
2265 struct fuse_session *se = req->se;
2266 struct fuse_retrieve_req *rreq =
2267 container_of(nreq, struct fuse_retrieve_req, nreq);
2268 const struct fuse_notify_retrieve_in *arg = inarg;
2269 struct fuse_bufvec bufv = {
2270 .buf[0] = *ibuf,
2271 .count = 1,
2272 };
2273
2274 if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD))
2275 bufv.buf[0].mem = PARAM(arg);
2276
2277 bufv.buf[0].size -= sizeof(struct fuse_in_header) +
2278 sizeof(struct fuse_notify_retrieve_in);
2279
2280 if (bufv.buf[0].size < arg->size) {
2281 fprintf(stderr, "fuse: retrieve reply: buffer size too small\n");
2282 fuse_reply_none(req);
2283 goto out;
2284 }
2285 bufv.buf[0].size = arg->size;
2286
2287 if (se->op.retrieve_reply) {
2288 se->op.retrieve_reply(req, rreq->cookie, ino,
2289 arg->offset, &bufv);
2290 } else {
2291 fuse_reply_none(req);
2292 }
2293 out:
2294 free(rreq);
2295 if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count)
2296 fuse_ll_clear_pipe(se);
2297 }
2298
2299 int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino,
2300 size_t size, off_t offset, void *cookie)
2301 {
2302 struct fuse_notify_retrieve_out outarg;
2303 struct iovec iov[2];
2304 struct fuse_retrieve_req *rreq;
2305 int err;
2306
2307 if (!se)
2308 return -EINVAL;
2309
2310 if (se->conn.proto_major < 6 || se->conn.proto_minor < 15)
2311 return -ENOSYS;
2312
2313 rreq = malloc(sizeof(*rreq));
2314 if (rreq == NULL)
2315 return -ENOMEM;
2316
2317 pthread_mutex_lock(&se->lock);
2318 rreq->cookie = cookie;
2319 rreq->nreq.unique = se->notify_ctr++;
2320 rreq->nreq.reply = fuse_ll_retrieve_reply;
2321 list_add_nreq(&rreq->nreq, &se->notify_list);
2322 pthread_mutex_unlock(&se->lock);
2323
2324 outarg.notify_unique = rreq->nreq.unique;
2325 outarg.nodeid = ino;
2326 outarg.offset = offset;
2327 outarg.size = size;
2328 outarg.padding = 0;
2329
2330 iov[1].iov_base = &outarg;
2331 iov[1].iov_len = sizeof(outarg);
2332
2333 err = send_notify_iov(se, FUSE_NOTIFY_RETRIEVE, iov, 2);
2334 if (err) {
2335 pthread_mutex_lock(&se->lock);
2336 list_del_nreq(&rreq->nreq);
2337 pthread_mutex_unlock(&se->lock);
2338 free(rreq);
2339 }
2340
2341 return err;
2342 }
2343
2344 void *fuse_req_userdata(fuse_req_t req)
2345 {
2346 return req->se->userdata;
2347 }
2348
2349 const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
2350 {
2351 return &req->ctx;
2352 }
2353
2354 void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
2355 void *data)
2356 {
2357 pthread_mutex_lock(&req->lock);
2358 pthread_mutex_lock(&req->se->lock);
2359 req->u.ni.func = func;
2360 req->u.ni.data = data;
2361 pthread_mutex_unlock(&req->se->lock);
2362 if (req->interrupted && func)
2363 func(req, data);
2364 pthread_mutex_unlock(&req->lock);
2365 }
2366
2367 int fuse_req_interrupted(fuse_req_t req)
2368 {
2369 int interrupted;
2370
2371 pthread_mutex_lock(&req->se->lock);
2372 interrupted = req->interrupted;
2373 pthread_mutex_unlock(&req->se->lock);
2374
2375 return interrupted;
2376 }
2377
2378 static struct {
2379 void (*func)(fuse_req_t, fuse_ino_t, const void *);
2380 const char *name;
2381 } fuse_ll_ops[] = {
2382 [FUSE_LOOKUP] = { do_lookup, "LOOKUP" },
2383 [FUSE_FORGET] = { do_forget, "FORGET" },
2384 [FUSE_GETATTR] = { do_getattr, "GETATTR" },
2385 [FUSE_SETATTR] = { do_setattr, "SETATTR" },
2386 [FUSE_READLINK] = { do_readlink, "READLINK" },
2387 [FUSE_SYMLINK] = { do_symlink, "SYMLINK" },
2388 [FUSE_MKNOD] = { do_mknod, "MKNOD" },
2389 [FUSE_MKDIR] = { do_mkdir, "MKDIR" },
2390 [FUSE_UNLINK] = { do_unlink, "UNLINK" },
2391 [FUSE_RMDIR] = { do_rmdir, "RMDIR" },
2392 [FUSE_RENAME] = { do_rename, "RENAME" },
2393 [FUSE_LINK] = { do_link, "LINK" },
2394 [FUSE_OPEN] = { do_open, "OPEN" },
2395 [FUSE_READ] = { do_read, "READ" },
2396 [FUSE_WRITE] = { do_write, "WRITE" },
2397 [FUSE_STATFS] = { do_statfs, "STATFS" },
2398 [FUSE_RELEASE] = { do_release, "RELEASE" },
2399 [FUSE_FSYNC] = { do_fsync, "FSYNC" },
2400 [FUSE_SETXATTR] = { do_setxattr, "SETXATTR" },
2401 [FUSE_GETXATTR] = { do_getxattr, "GETXATTR" },
2402 [FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" },
2403 [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
2404 [FUSE_FLUSH] = { do_flush, "FLUSH" },
2405 [FUSE_INIT] = { do_init, "INIT" },
2406 [FUSE_OPENDIR] = { do_opendir, "OPENDIR" },
2407 [FUSE_READDIR] = { do_readdir, "READDIR" },
2408 [FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" },
2409 [FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" },
2410 [FUSE_GETLK] = { do_getlk, "GETLK" },
2411 [FUSE_SETLK] = { do_setlk, "SETLK" },
2412 [FUSE_SETLKW] = { do_setlkw, "SETLKW" },
2413 [FUSE_ACCESS] = { do_access, "ACCESS" },
2414 [FUSE_CREATE] = { do_create, "CREATE" },
2415 [FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" },
2416 [FUSE_BMAP] = { do_bmap, "BMAP" },
2417 [FUSE_IOCTL] = { do_ioctl, "IOCTL" },
2418 [FUSE_POLL] = { do_poll, "POLL" },
2419 [FUSE_FALLOCATE] = { do_fallocate, "FALLOCATE" },
2420 [FUSE_DESTROY] = { do_destroy, "DESTROY" },
2421 [FUSE_NOTIFY_REPLY] = { (void *) 1, "NOTIFY_REPLY" },
2422 [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" },
2423 [FUSE_READDIRPLUS] = { do_readdirplus, "READDIRPLUS"},
2424 [FUSE_RENAME2] = { do_rename2, "RENAME2" },
2425 [FUSE_COPY_FILE_RANGE] = { do_copy_file_range, "COPY_FILE_RANGE" },
2426 [CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" },
2427 };
2428
2429 #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))
2430
2431 static const char *opname(enum fuse_opcode opcode)
2432 {
2433 if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
2434 return "???";
2435 else
2436 return fuse_ll_ops[opcode].name;
2437 }
2438
2439 static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst,
2440 struct fuse_bufvec *src)
2441 {
2442 ssize_t res = fuse_buf_copy(dst, src, 0);
2443 if (res < 0) {
2444 fprintf(stderr, "fuse: copy from pipe: %s\n", strerror(-res));
2445 return res;
2446 }
2447 if ((size_t)res < fuse_buf_size(dst)) {
2448 fprintf(stderr, "fuse: copy from pipe: short read\n");
2449 return -1;
2450 }
2451 return 0;
2452 }
2453
2454 void fuse_session_process_buf(struct fuse_session *se,
2455 const struct fuse_buf *buf)
2456 {
2457 fuse_session_process_buf_int(se, buf, NULL);
2458 }
2459
2460 void fuse_session_process_buf_int(struct fuse_session *se,
2461 const struct fuse_buf *buf, struct fuse_chan *ch)
2462 {
2463 const size_t write_header_size = sizeof(struct fuse_in_header) +
2464 sizeof(struct fuse_write_in);
2465 struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 };
2466 struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size);
2467 struct fuse_in_header *in;
2468 const void *inarg;
2469 struct fuse_req *req;
2470 void *mbuf = NULL;
2471 int err;
2472 int res;
2473
2474 if (buf->flags & FUSE_BUF_IS_FD) {
2475 if (buf->size < tmpbuf.buf[0].size)
2476 tmpbuf.buf[0].size = buf->size;
2477
2478 mbuf = malloc(tmpbuf.buf[0].size);
2479 if (mbuf == NULL) {
2480 fprintf(stderr, "fuse: failed to allocate header\n");
2481 goto clear_pipe;
2482 }
2483 tmpbuf.buf[0].mem = mbuf;
2484
2485 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2486 if (res < 0)
2487 goto clear_pipe;
2488
2489 in = mbuf;
2490 } else {
2491 in = buf->mem;
2492 }
2493
2494 if (se->debug) {
2495 fprintf(stderr,
2496 "unique: %llu, opcode: %s (%i), nodeid: %llu, insize: %zu, pid: %u\n",
2497 (unsigned long long) in->unique,
2498 opname((enum fuse_opcode) in->opcode), in->opcode,
2499 (unsigned long long) in->nodeid, buf->size, in->pid);
2500 }
2501
2502 req = fuse_ll_alloc_req(se);
2503 if (req == NULL) {
2504 struct fuse_out_header out = {
2505 .unique = in->unique,
2506 .error = -ENOMEM,
2507 };
2508 struct iovec iov = {
2509 .iov_base = &out,
2510 .iov_len = sizeof(struct fuse_out_header),
2511 };
2512
2513 fuse_send_msg(se, ch, &iov, 1);
2514 goto clear_pipe;
2515 }
2516
2517 req->unique = in->unique;
2518 req->ctx.uid = in->uid;
2519 req->ctx.gid = in->gid;
2520 req->ctx.pid = in->pid;
2521 req->ch = ch ? fuse_chan_get(ch) : NULL;
2522
2523 err = EIO;
2524 if (!se->got_init) {
2525 enum fuse_opcode expected;
2526
2527 expected = se->cuse_data ? CUSE_INIT : FUSE_INIT;
2528 if (in->opcode != expected)
2529 goto reply_err;
2530 } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
2531 goto reply_err;
2532
2533 err = EACCES;
2534 /* Implement -o allow_root */
2535 if (se->deny_others && in->uid != se->owner && in->uid != 0 &&
2536 in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
2537 in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
2538 in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
2539 in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR &&
2540 in->opcode != FUSE_NOTIFY_REPLY &&
2541 in->opcode != FUSE_READDIRPLUS)
2542 goto reply_err;
2543
2544 err = ENOSYS;
2545 if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
2546 goto reply_err;
2547 if (in->opcode != FUSE_INTERRUPT) {
2548 struct fuse_req *intr;
2549 pthread_mutex_lock(&se->lock);
2550 intr = check_interrupt(se, req);
2551 list_add_req(req, &se->list);
2552 pthread_mutex_unlock(&se->lock);
2553 if (intr)
2554 fuse_reply_err(intr, EAGAIN);
2555 }
2556
2557 if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size &&
2558 (in->opcode != FUSE_WRITE || !se->op.write_buf) &&
2559 in->opcode != FUSE_NOTIFY_REPLY) {
2560 void *newmbuf;
2561
2562 err = ENOMEM;
2563 newmbuf = realloc(mbuf, buf->size);
2564 if (newmbuf == NULL)
2565 goto reply_err;
2566 mbuf = newmbuf;
2567
2568 tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size);
2569 tmpbuf.buf[0].mem = mbuf + write_header_size;
2570
2571 res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv);
2572 err = -res;
2573 if (res < 0)
2574 goto reply_err;
2575
2576 in = mbuf;
2577 }
2578
2579 inarg = (void *) &in[1];
2580 if (in->opcode == FUSE_WRITE && se->op.write_buf)
2581 do_write_buf(req, in->nodeid, inarg, buf);
2582 else if (in->opcode == FUSE_NOTIFY_REPLY)
2583 do_notify_reply(req, in->nodeid, inarg, buf);
2584 else
2585 fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
2586
2587 out_free:
2588 free(mbuf);
2589 return;
2590
2591 reply_err:
2592 fuse_reply_err(req, err);
2593 clear_pipe:
2594 if (buf->flags & FUSE_BUF_IS_FD)
2595 fuse_ll_clear_pipe(se);
2596 goto out_free;
2597 }
2598
2599 #define LL_OPTION(n,o,v) \
2600 { n, offsetof(struct fuse_session, o), v }
2601
2602 static const struct fuse_opt fuse_ll_opts[] = {
2603 LL_OPTION("debug", debug, 1),
2604 LL_OPTION("-d", debug, 1),
2605 LL_OPTION("--debug", debug, 1),
2606 LL_OPTION("allow_root", deny_others, 1),
2607 FUSE_OPT_END
2608 };
2609
2610 void fuse_lowlevel_version(void)
2611 {
2612 printf("using FUSE kernel interface version %i.%i\n",
2613 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
2614 fuse_mount_version();
2615 }
2616
2617 void fuse_lowlevel_help(void)
2618 {
2619 /* These are not all options, but the ones that are
2620 potentially of interest to an end-user */
2621 printf(
2622 " -o allow_other allow access by all users\n"
2623 " -o allow_root allow access by root\n"
2624 " -o auto_unmount auto unmount on process termination\n");
2625 }
2626
2627 void fuse_session_destroy(struct fuse_session *se)
2628 {
2629 struct fuse_ll_pipe *llp;
2630
2631 if (se->got_init && !se->got_destroy) {
2632 if (se->op.destroy)
2633 se->op.destroy(se->userdata);
2634 }
2635 llp = pthread_getspecific(se->pipe_key);
2636 if (llp != NULL)
2637 fuse_ll_pipe_free(llp);
2638 pthread_key_delete(se->pipe_key);
2639 pthread_mutex_destroy(&se->lock);
2640 free(se->cuse_data);
2641 if (se->fd != -1)
2642 close(se->fd);
2643 destroy_mount_opts(se->mo);
2644 free(se);
2645 }
2646
2647
2648 static void fuse_ll_pipe_destructor(void *data)
2649 {
2650 struct fuse_ll_pipe *llp = data;
2651 fuse_ll_pipe_free(llp);
2652 }
2653
2654 int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
2655 {
2656 return fuse_session_receive_buf_int(se, buf, NULL);
2657 }
2658
2659 int fuse_session_receive_buf_int(struct fuse_session *se, struct fuse_buf *buf,
2660 struct fuse_chan *ch)
2661 {
2662 int err;
2663 ssize_t res;
2664 #ifdef HAVE_SPLICE
2665 size_t bufsize = se->bufsize;
2666 struct fuse_ll_pipe *llp;
2667 struct fuse_buf tmpbuf;
2668
2669 if (se->conn.proto_minor < 14 || !(se->conn.want & FUSE_CAP_SPLICE_READ))
2670 goto fallback;
2671
2672 llp = fuse_ll_get_pipe(se);
2673 if (llp == NULL)
2674 goto fallback;
2675
2676 if (llp->size < bufsize) {
2677 if (llp->can_grow) {
2678 res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize);
2679 if (res == -1) {
2680 llp->can_grow = 0;
2681 goto fallback;
2682 }
2683 llp->size = res;
2684 }
2685 if (llp->size < bufsize)
2686 goto fallback;
2687 }
2688
2689 res = splice(ch ? ch->fd : se->fd,
2690 NULL, llp->pipe[1], NULL, bufsize, 0);
2691 err = errno;
2692
2693 if (fuse_session_exited(se))
2694 return 0;
2695
2696 if (res == -1) {
2697 if (err == ENODEV) {
2698 /* Filesystem was unmounted, or connection was aborted
2699 via /sys/fs/fuse/connections */
2700 fuse_session_exit(se);
2701 return 0;
2702 }
2703 if (err != EINTR && err != EAGAIN)
2704 perror("fuse: splice from device");
2705 return -err;
2706 }
2707
2708 if (res < sizeof(struct fuse_in_header)) {
2709 fprintf(stderr, "short splice from fuse device\n");
2710 return -EIO;
2711 }
2712
2713 tmpbuf = (struct fuse_buf) {
2714 .size = res,
2715 .flags = FUSE_BUF_IS_FD,
2716 .fd = llp->pipe[0],
2717 };
2718
2719 /*
2720 * Don't bother with zero copy for small requests.
2721 * fuse_loop_mt() needs to check for FORGET so this more than
2722 * just an optimization.
2723 */
2724 if (res < sizeof(struct fuse_in_header) +
2725 sizeof(struct fuse_write_in) + pagesize) {
2726 struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 };
2727 struct fuse_bufvec dst = { .count = 1 };
2728
2729 if (!buf->mem) {
2730 buf->mem = malloc(se->bufsize);
2731 if (!buf->mem) {
2732 fprintf(stderr,
2733 "fuse: failed to allocate read buffer\n");
2734 return -ENOMEM;
2735 }
2736 }
2737 buf->size = se->bufsize;
2738 buf->flags = 0;
2739 dst.buf[0] = *buf;
2740
2741 res = fuse_buf_copy(&dst, &src, 0);
2742 if (res < 0) {
2743 fprintf(stderr, "fuse: copy from pipe: %s\n",
2744 strerror(-res));
2745 fuse_ll_clear_pipe(se);
2746 return res;
2747 }
2748 if (res < tmpbuf.size) {
2749 fprintf(stderr, "fuse: copy from pipe: short read\n");
2750 fuse_ll_clear_pipe(se);
2751 return -EIO;
2752 }
2753 assert(res == tmpbuf.size);
2754
2755 } else {
2756 /* Don't overwrite buf->mem, as that would cause a leak */
2757 buf->fd = tmpbuf.fd;
2758 buf->flags = tmpbuf.flags;
2759 }
2760 buf->size = tmpbuf.size;
2761
2762 return res;
2763
2764 fallback:
2765 #endif
2766 if (!buf->mem) {
2767 buf->mem = malloc(se->bufsize);
2768 if (!buf->mem) {
2769 fprintf(stderr,
2770 "fuse: failed to allocate read buffer\n");
2771 return -ENOMEM;
2772 }
2773 }
2774
2775 restart:
2776 res = read(ch ? ch->fd : se->fd, buf->mem, se->bufsize);
2777 err = errno;
2778
2779 if (fuse_session_exited(se))
2780 return 0;
2781 if (res == -1) {
2782 /* ENOENT means the operation was interrupted, it's safe
2783 to restart */
2784 if (err == ENOENT)
2785 goto restart;
2786
2787 if (err == ENODEV) {
2788 /* Filesystem was unmounted, or connection was aborted
2789 via /sys/fs/fuse/connections */
2790 fuse_session_exit(se);
2791 return 0;
2792 }
2793 /* Errors occurring during normal operation: EINTR (read
2794 interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem
2795 umounted) */
2796 if (err != EINTR && err != EAGAIN)
2797 perror("fuse: reading device");
2798 return -err;
2799 }
2800 if ((size_t) res < sizeof(struct fuse_in_header)) {
2801 fprintf(stderr, "short read on fuse device\n");
2802 return -EIO;
2803 }
2804
2805 buf->size = res;
2806
2807 return res;
2808 }
2809
2810 #define KERNEL_BUF_PAGES 32
2811
2812 /* room needed in buffer to accommodate header */
2813 #define HEADER_SIZE 0x1000
2814
2815 struct fuse_session *fuse_session_new(struct fuse_args *args,
2816 const struct fuse_lowlevel_ops *op,
2817 size_t op_size, void *userdata)
2818 {
2819 int err;
2820 struct fuse_session *se;
2821 struct mount_opts *mo;
2822
2823 if (sizeof(struct fuse_lowlevel_ops) < op_size) {
2824 fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
2825 op_size = sizeof(struct fuse_lowlevel_ops);
2826 }
2827
2828 if (args->argc == 0) {
2829 fprintf(stderr, "fuse: empty argv passed to fuse_session_new().\n");
2830 return NULL;
2831 }
2832
2833 se = (struct fuse_session *) calloc(1, sizeof(struct fuse_session));
2834 if (se == NULL) {
2835 fprintf(stderr, "fuse: failed to allocate fuse object\n");
2836 goto out1;
2837 }
2838 se->fd = -1;
2839 se->conn.max_write = UINT_MAX;
2840 se->conn.max_readahead = UINT_MAX;
2841
2842 /* Parse options */
2843 if(fuse_opt_parse(args, se, fuse_ll_opts, NULL) == -1)
2844 goto out2;
2845 if(se->deny_others) {
2846 /* Allowing access only by root is done by instructing
2847 * kernel to allow access by everyone, and then restricting
2848 * access to root and mountpoint owner in libfuse.
2849 */
2850 // We may be adding the option a second time, but
2851 // that doesn't hurt.
2852 if(fuse_opt_add_arg(args, "-oallow_other") == -1)
2853 goto out2;
2854 }
2855 mo = parse_mount_opts(args);
2856 if (mo == NULL)
2857 goto out3;
2858
2859 if(args->argc == 1 &&
2860 args->argv[0][0] == '-') {
2861 fprintf(stderr, "fuse: warning: argv[0] looks like an option, but "
2862 "will be ignored\n");
2863 } else if (args->argc != 1) {
2864 int i;
2865 fprintf(stderr, "fuse: unknown option(s): `");
2866 for(i = 1; i < args->argc-1; i++)
2867 fprintf(stderr, "%s ", args->argv[i]);
2868 fprintf(stderr, "%s'\n", args->argv[i]);
2869 goto out4;
2870 }
2871
2872 if (se->debug)
2873 fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION);
2874
2875 se->bufsize = KERNEL_BUF_PAGES * getpagesize() + HEADER_SIZE;
2876
2877 list_init_req(&se->list);
2878 list_init_req(&se->interrupts);
2879 list_init_nreq(&se->notify_list);
2880 se->notify_ctr = 1;
2881 fuse_mutex_init(&se->lock);
2882
2883 err = pthread_key_create(&se->pipe_key, fuse_ll_pipe_destructor);
2884 if (err) {
2885 fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
2886 strerror(err));
2887 goto out5;
2888 }
2889
2890 memcpy(&se->op, op, op_size);
2891 se->owner = getuid();
2892 se->userdata = userdata;
2893
2894 se->mo = mo;
2895 return se;
2896
2897 out5:
2898 pthread_mutex_destroy(&se->lock);
2899 out4:
2900 fuse_opt_free_args(args);
2901 out3:
2902 free(mo);
2903 out2:
2904 free(se);
2905 out1:
2906 return NULL;
2907 }
2908
2909 int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
2910 {
2911 int fd;
2912
2913 /*
2914 * Make sure file descriptors 0, 1 and 2 are open, otherwise chaos
2915 * would ensue.
2916 */
2917 do {
2918 fd = open("/dev/null", O_RDWR);
2919 if (fd > 2)
2920 close(fd);
2921 } while (fd >= 0 && fd <= 2);
2922
2923 /*
2924 * To allow FUSE daemons to run without privileges, the caller may open
2925 * /dev/fuse before launching the file system and pass on the file
2926 * descriptor by specifying /dev/fd/N as the mount point. Note that the
2927 * parent process takes care of performing the mount in this case.
2928 */
2929 fd = fuse_mnt_parse_fuse_fd(mountpoint);
2930 if (fd != -1) {
2931 if (fcntl(fd, F_GETFD) == -1) {
2932 fprintf(stderr,
2933 "fuse: Invalid file descriptor /dev/fd/%u\n",
2934 fd);
2935 return -1;
2936 }
2937 se->fd = fd;
2938 return 0;
2939 }
2940
2941 /* Open channel */
2942 fd = fuse_kern_mount(mountpoint, se->mo);
2943 if (fd == -1)
2944 return -1;
2945 se->fd = fd;
2946
2947 /* Save mountpoint */
2948 se->mountpoint = strdup(mountpoint);
2949 if (se->mountpoint == NULL)
2950 goto error_out;
2951
2952 return 0;
2953
2954 error_out:
2955 fuse_kern_unmount(mountpoint, fd);
2956 return -1;
2957 }
2958
2959 int fuse_session_fd(struct fuse_session *se)
2960 {
2961 return se->fd;
2962 }
2963
2964 void fuse_session_unmount(struct fuse_session *se)
2965 {
2966 if (se->mountpoint != NULL) {
2967 fuse_kern_unmount(se->mountpoint, se->fd);
2968 free(se->mountpoint);
2969 se->mountpoint = NULL;
2970 }
2971 }
2972
2973 #ifdef linux
2974 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
2975 {
2976 char *buf;
2977 size_t bufsize = 1024;
2978 char path[128];
2979 int ret;
2980 int fd;
2981 unsigned long pid = req->ctx.pid;
2982 char *s;
2983
2984 sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);
2985
2986 retry:
2987 buf = malloc(bufsize);
2988 if (buf == NULL)
2989 return -ENOMEM;
2990
2991 ret = -EIO;
2992 fd = open(path, O_RDONLY);
2993 if (fd == -1)
2994 goto out_free;
2995
2996 ret = read(fd, buf, bufsize);
2997 close(fd);
2998 if (ret < 0) {
2999 ret = -EIO;
3000 goto out_free;
3001 }
3002
3003 if ((size_t)ret == bufsize) {
3004 free(buf);
3005 bufsize *= 4;
3006 goto retry;
3007 }
3008
3009 ret = -EIO;
3010 s = strstr(buf, "\nGroups:");
3011 if (s == NULL)
3012 goto out_free;
3013
3014 s += 8;
3015 ret = 0;
3016 while (1) {
3017 char *end;
3018 unsigned long val = strtoul(s, &end, 0);
3019 if (end == s)
3020 break;
3021
3022 s = end;
3023 if (ret < size)
3024 list[ret] = val;
3025 ret++;
3026 }
3027
3028 out_free:
3029 free(buf);
3030 return ret;
3031 }
3032 #else /* linux */
3033 /*
3034 * This is currently not implemented on other than Linux...
3035 */
3036 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
3037 {
3038 (void) req; (void) size; (void) list;
3039 return -ENOSYS;
3040 }
3041 #endif
3042
3043 void fuse_session_exit(struct fuse_session *se)
3044 {
3045 se->exited = 1;
3046 }
3047
3048 void fuse_session_reset(struct fuse_session *se)
3049 {
3050 se->exited = 0;
3051 se->error = 0;
3052 }
3053
3054 int fuse_session_exited(struct fuse_session *se)
3055 {
3056 return se->exited;
3057 }
fuse_session_destroy
void fuse_session_destroy(struct fuse_session *se)
Definition: fuse_lowlevel.c:2627
fuse_reply_err
int fuse_reply_err(fuse_req_t req, int err)
Definition: fuse_lowlevel.c:312
fuse_bufvec::off
size_t off
Definition: fuse_common.h:710
FUSE_CAP_IOCTL_DIR
#define FUSE_CAP_IOCTL_DIR
Definition: fuse_common.h:216
fuse_session_receive_buf
int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf)
Definition: fuse_lowlevel.c:2654
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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:2815
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void fuse_session_exit(struct fuse_session *se)
Definition: fuse_lowlevel.c:3043
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Definition: fuse_common.h:91
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:2299
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:2193
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unsigned int writepage
Definition: fuse_common.h:53
fuse_reply_ioctl
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Definition: fuse_lowlevel.c:981
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Definition: fuse_lowlevel.c:2617
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Definition: fuse_opt.h:111
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unsigned int direct_io
Definition: fuse_common.h:56
FUSE_BUF_IS_FD
Definition: fuse_common.h:586
FUSE_CAP_HANDLE_KILLPRIV
#define FUSE_CAP_HANDLE_KILLPRIV
Definition: fuse_common.h:336
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:357
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:822
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uint32_t poll_events
Definition: fuse_common.h:98
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int fuse_session_fd(struct fuse_session *se)
Definition: fuse_lowlevel.c:2959
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const struct fuse_ctx * fuse_req_ctx(fuse_req_t req)
Definition: fuse_lowlevel.c:2349
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Definition: fuse_common.h:628
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int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
Definition: fuse_lowlevel.c:2909
FUSE_CAP_ASYNC_READ
#define FUSE_CAP_ASYNC_READ
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fuse_reply_ioctl_retry
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Definition: fuse_lowlevel.c:911
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int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
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void(* fuse_interrupt_func_t)(fuse_req_t req, void *data)
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Definition: fuse_lowlevel.h:49
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Definition: fuse_lowlevel.h:91
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Definition: fuse_lowlevel.c:267
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Definition: fuse_lowlevel.c:2344
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Definition: fuse_lowlevel.c:2147
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Definition: fuse_lowlevel.c:883
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unsigned int keep_cache
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uint64_t lock_owner
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Definition: fuse_lowlevel.c:401
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#define FUSE_CAP_READDIRPLUS_AUTO
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#define FUSE_CAP_SPLICE_WRITE
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Definition: fuse_opt.c:54
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Definition: fuse_lowlevel.c:2219
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Definition: fuse_common.h:43
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Definition: fuse_lowlevel.c:866
FUSE_CAP_NO_OPEN_SUPPORT
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Definition: fuse_lowlevel.c:1002
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Definition: fuse_lowlevel.c:317
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Definition: fuse_lowlevel.c:3036
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Definition: fuse_common.h:45
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Definition: fuse_common.h:696
fuse_opt_free_args
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fuse_bufvec::idx
size_t idx
Definition: fuse_common.h:705
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Definition: fuse_lowlevel.h:114
FUSE_CAP_NO_OPENDIR_SUPPORT
#define FUSE_CAP_NO_OPENDIR_SUPPORT
Definition: fuse_common.h:348
fuse_bufvec::count
size_t count
Definition: fuse_common.h:700
FUSE_CAP_AUTO_INVAL_DATA
#define FUSE_CAP_AUTO_INVAL_DATA
Definition: fuse_common.h:238
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:2169
fuse_opt.h
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int fuse_reply_attr(fuse_req_t req, const struct stat *attr, double attr_timeout)
Definition: fuse_lowlevel.c:433
FUSE_CAP_SPLICE_READ
#define FUSE_CAP_SPLICE_READ
Definition: fuse_common.h:196
fuse_session_unmount
void fuse_session_unmount(struct fuse_session *se)
Definition: fuse_lowlevel.c:2964
fuse_file_info::nonseekable
unsigned int nonseekable
Definition: fuse_common.h:72
FUSE_OPT_END
#define FUSE_OPT_END
Definition: fuse_opt.h:104
fuse_buf::flags
enum fuse_buf_flags flags
Definition: fuse_common.h:664
fuse_reply_statfs
int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
Definition: fuse_lowlevel.c:844
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void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
Definition: fuse_lowlevel.c:1770
fuse_file_info::flush
unsigned int flush
Definition: fuse_common.h:68
FUSE_BUF_NO_SPLICE
Definition: fuse_common.h:620
FUSE_CAP_FLOCK_LOCKS
#define FUSE_CAP_FLOCK_LOCKS
Definition: fuse_common.h:209
fuse_ino_t
uint64_t fuse_ino_t
Definition: fuse_lowlevel.h:46
fuse_args::argv
char ** argv
Definition: fuse_opt.h:114
FUSE_CAP_ASYNC_DIO
#define FUSE_CAP_ASYNC_DIO
Definition: fuse_common.h:276
fuse_req_interrupt_func
void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func, void *data)
Definition: fuse_lowlevel.c:2354
fuse_entry_param::generation
uint64_t generation
Definition: fuse_lowlevel.h:82
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:417
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int fuse_reply_write(fuse_req_t req, size_t count)
Definition: fuse_lowlevel.c:462
fuse_buf::mem
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Definition: fuse_common.h:671
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Definition: fuse_common.h:285
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Definition: fuse_common.h:147
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Definition: fuse_common.h:327
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Definition: fuse_lowlevel.c:453
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Definition: fuse_common.h:83
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Definition: fuse_common.h:646
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Definition: fuse_lowlevel.h:175
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Definition: fuse_common.h:715
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Definition: fuse_opt.h:77
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Definition: fuse_common.h:156
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Definition: fuse_opt.h:109
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Definition: fuse_common.h:246
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Definition: fuse_common.h:308
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Definition: buffer.c:22
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Definition: buffer.c:281
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Definition: fuse_common.h:659
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Definition: fuse_lowlevel.h:103
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Definition: fuse_common.h:610
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Definition: fuse_common.h:678
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double attr_timeout
Definition: fuse_lowlevel.h:97
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Definition: fuse_lowlevel.c:246
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Definition: fuse_common.h:655
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Definition: fuse_lowlevel.c:448
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Definition: fuse_lowlevel.c:472
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Definition: fuse_lowlevel.c:1026
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Definition: fuse_lowlevel.c:2454
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Definition: fuse_common.h:171