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