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fuse_lowlevel.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU LGPLv2.
  See the file COPYING.LIB
*/

#include "fuse_i.h"
#include "fuse_kernel.h"
#include "fuse_opt.h"
#include "fuse_misc.h"
#include "fuse_common_compat.h"
#include "fuse_lowlevel_compat.h"

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>

#define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg)))
#define OFFSET_MAX 0x7fffffffffffffffLL

00027 struct fuse_pollhandle {
      uint64_t kh;
      struct fuse_chan *ch;
      struct fuse_ll *f;
};

static void convert_stat(const struct stat *stbuf, struct fuse_attr *attr)
{
      attr->ino   = stbuf->st_ino;
      attr->mode  = stbuf->st_mode;
      attr->nlink = stbuf->st_nlink;
      attr->uid   = stbuf->st_uid;
      attr->gid   = stbuf->st_gid;
      attr->rdev  = stbuf->st_rdev;
      attr->size  = stbuf->st_size;
      attr->blksize     = stbuf->st_blksize;
      attr->blocks      = stbuf->st_blocks;
      attr->atime = stbuf->st_atime;
      attr->mtime = stbuf->st_mtime;
      attr->ctime = stbuf->st_ctime;
      attr->atimensec = ST_ATIM_NSEC(stbuf);
      attr->mtimensec = ST_MTIM_NSEC(stbuf);
      attr->ctimensec = ST_CTIM_NSEC(stbuf);
}

static void convert_attr(const struct fuse_setattr_in *attr, struct stat *stbuf)
{
      stbuf->st_mode           = attr->mode;
      stbuf->st_uid            = attr->uid;
      stbuf->st_gid            = attr->gid;
      stbuf->st_size           = attr->size;
      stbuf->st_atime          = attr->atime;
      stbuf->st_mtime          = attr->mtime;
      ST_ATIM_NSEC_SET(stbuf, attr->atimensec);
      ST_MTIM_NSEC_SET(stbuf, attr->mtimensec);
}

static      size_t iov_length(const struct iovec *iov, size_t count)
{
      size_t seg;
      size_t ret = 0;

      for (seg = 0; seg < count; seg++)
            ret += iov[seg].iov_len;
      return ret;
}

static void list_init_req(struct fuse_req *req)
{
      req->next = req;
      req->prev = req;
}

static void list_del_req(struct fuse_req *req)
{
      struct fuse_req *prev = req->prev;
      struct fuse_req *next = req->next;
      prev->next = next;
      next->prev = prev;
}

static void list_add_req(struct fuse_req *req, struct fuse_req *next)
{
      struct fuse_req *prev = next->prev;
      req->next = next;
      req->prev = prev;
      prev->next = req;
      next->prev = req;
}

static void destroy_req(fuse_req_t req)
{
      pthread_mutex_destroy(&req->lock);
      free(req);
}

void fuse_free_req(fuse_req_t req)
{
      int ctr;
      struct fuse_ll *f = req->f;

      pthread_mutex_lock(&f->lock);
      req->u.ni.func = NULL;
      req->u.ni.data = NULL;
      list_del_req(req);
      ctr = --req->ctr;
      pthread_mutex_unlock(&f->lock);
      if (!ctr)
            destroy_req(req);
}

int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
                         int count)
{
      struct fuse_out_header out;

      if (error <= -1000 || error > 0) {
            fprintf(stderr, "fuse: bad error value: %i\n",  error);
            error = -ERANGE;
      }

      out.unique = req->unique;
      out.error = error;
      iov[0].iov_base = &out;
      iov[0].iov_len = sizeof(struct fuse_out_header);
      out.len = iov_length(iov, count);

      if (req->f->debug) {
            if (out.error) {
                  fprintf(stderr,
                        "   unique: %llu, error: %i (%s), outsize: %i\n",
                        (unsigned long long) out.unique, out.error,
                        strerror(-out.error), out.len);
            } else {
                  fprintf(stderr,
                        "   unique: %llu, success, outsize: %i\n",
                        (unsigned long long) out.unique, out.len);
            }
      }

      return fuse_chan_send(req->ch, iov, count);
}

static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov,
                    int count)
{
      int res;

      res = fuse_send_reply_iov_nofree(req, error, iov, count);
      fuse_free_req(req);
      return res;
}

static int send_reply(fuse_req_t req, int error, const void *arg,
                  size_t argsize)
{
      struct iovec iov[2];
      int count = 1;
      if (argsize) {
            iov[1].iov_base = (void *) arg;
            iov[1].iov_len = argsize;
            count++;
      }
      return send_reply_iov(req, error, iov, count);
}

00173 int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count)
{
      int res;
      struct iovec *padded_iov;

      padded_iov = malloc((count + 1) * sizeof(struct iovec));
      if (padded_iov == NULL)
            return fuse_reply_err(req, -ENOMEM);

      memcpy(padded_iov + 1, iov, count * sizeof(struct iovec));
      count++;

      res = send_reply_iov(req, 0, padded_iov, count);
      free(padded_iov);

      return res;
}

size_t fuse_dirent_size(size_t namelen)
{
      return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen);
}

char *fuse_add_dirent(char *buf, const char *name, const struct stat *stbuf,
                  off_t off)
{
      unsigned namelen = strlen(name);
      unsigned entlen = FUSE_NAME_OFFSET + namelen;
      unsigned entsize = fuse_dirent_size(namelen);
      unsigned padlen = entsize - entlen;
      struct fuse_dirent *dirent = (struct fuse_dirent *) buf;

      dirent->ino = stbuf->st_ino;
      dirent->off = off;
      dirent->namelen = namelen;
      dirent->type = (stbuf->st_mode & 0170000) >> 12;
      strncpy(dirent->name, name, namelen);
      if (padlen)
            memset(buf + entlen, 0, padlen);

      return buf + entsize;
}

00216 size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize,
                   const char *name, const struct stat *stbuf, off_t off)
{
      size_t entsize;

      (void) req;
      entsize = fuse_dirent_size(strlen(name));
      if (entsize <= bufsize && buf)
            fuse_add_dirent(buf, name, stbuf, off);
      return entsize;
}

static void convert_statfs(const struct statvfs *stbuf,
                     struct fuse_kstatfs *kstatfs)
{
      kstatfs->bsize     = stbuf->f_bsize;
      kstatfs->frsize    = stbuf->f_frsize;
      kstatfs->blocks    = stbuf->f_blocks;
      kstatfs->bfree     = stbuf->f_bfree;
      kstatfs->bavail    = stbuf->f_bavail;
      kstatfs->files     = stbuf->f_files;
      kstatfs->ffree     = stbuf->f_ffree;
      kstatfs->namelen = stbuf->f_namemax;
}

static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize)
{
      return send_reply(req, 0, arg, argsize);
}

00246 int fuse_reply_err(fuse_req_t req, int err)
{
      return send_reply(req, -err, NULL, 0);
}

00251 void fuse_reply_none(fuse_req_t req)
{
      fuse_chan_send(req->ch, NULL, 0);
      fuse_free_req(req);
}

static unsigned long calc_timeout_sec(double t)
{
      if (t > (double) ULONG_MAX)
            return ULONG_MAX;
      else if (t < 0.0)
            return 0;
      else
            return (unsigned long) t;
}

static unsigned int calc_timeout_nsec(double t)
{
      double f = t - (double) calc_timeout_sec(t);
      if (f < 0.0)
            return 0;
      else if (f >= 0.999999999)
            return 999999999;
      else
            return (unsigned int) (f * 1.0e9);
}

static void fill_entry(struct fuse_entry_out *arg,
                   const struct fuse_entry_param *e)
{
      arg->nodeid = e->ino;
      arg->generation = e->generation;
      arg->entry_valid = calc_timeout_sec(e->entry_timeout);
      arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout);
      arg->attr_valid = calc_timeout_sec(e->attr_timeout);
      arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout);
      convert_stat(&e->attr, &arg->attr);
}

static void fill_open(struct fuse_open_out *arg,
                  const struct fuse_file_info *f)
{
      arg->fh = f->fh;
      if (f->direct_io)
            arg->open_flags |= FOPEN_DIRECT_IO;
      if (f->keep_cache)
            arg->open_flags |= FOPEN_KEEP_CACHE;
      if (f->nonseekable)
            arg->open_flags |= FOPEN_NONSEEKABLE;
}

00302 int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
{
      struct fuse_entry_out arg;
      size_t size = req->f->conn.proto_minor < 9 ?
            FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);

      /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
         negative entry */
      if (!e->ino && req->f->conn.proto_minor < 4)
            return fuse_reply_err(req, ENOENT);

      memset(&arg, 0, sizeof(arg));
      fill_entry(&arg, e);
      return send_reply_ok(req, &arg, size);
}

00318 int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e,
                  const struct fuse_file_info *f)
{
      char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)];
      size_t entrysize = req->f->conn.proto_minor < 9 ?
            FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
      struct fuse_entry_out *earg = (struct fuse_entry_out *) buf;
      struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize);

      memset(buf, 0, sizeof(buf));
      fill_entry(earg, e);
      fill_open(oarg, f);
      return send_reply_ok(req, buf,
                       entrysize + sizeof(struct fuse_open_out));
}

00334 int fuse_reply_attr(fuse_req_t req, const struct stat *attr,
                double attr_timeout)
{
      struct fuse_attr_out arg;
      size_t size = req->f->conn.proto_minor < 9 ?
            FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);

      memset(&arg, 0, sizeof(arg));
      arg.attr_valid = calc_timeout_sec(attr_timeout);
      arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout);
      convert_stat(attr, &arg.attr);

      return send_reply_ok(req, &arg, size);
}

00349 int fuse_reply_readlink(fuse_req_t req, const char *linkname)
{
      return send_reply_ok(req, linkname, strlen(linkname));
}

00354 int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f)
{
      struct fuse_open_out arg;

      memset(&arg, 0, sizeof(arg));
      fill_open(&arg, f);
      return send_reply_ok(req, &arg, sizeof(arg));
}

00363 int fuse_reply_write(fuse_req_t req, size_t count)
{
      struct fuse_write_out arg;

      memset(&arg, 0, sizeof(arg));
      arg.size = count;

      return send_reply_ok(req, &arg, sizeof(arg));
}

00373 int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
{
      return send_reply_ok(req, buf, size);
}

00378 int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf)
{
      struct fuse_statfs_out arg;
      size_t size = req->f->conn.proto_minor < 4 ?
            FUSE_COMPAT_STATFS_SIZE : sizeof(arg);

      memset(&arg, 0, sizeof(arg));
      convert_statfs(stbuf, &arg.st);

      return send_reply_ok(req, &arg, size);
}

00390 int fuse_reply_xattr(fuse_req_t req, size_t count)
{
      struct fuse_getxattr_out arg;

      memset(&arg, 0, sizeof(arg));
      arg.size = count;

      return send_reply_ok(req, &arg, sizeof(arg));
}

00400 int fuse_reply_lock(fuse_req_t req, struct flock *lock)
{
      struct fuse_lk_out arg;

      memset(&arg, 0, sizeof(arg));
      arg.lk.type = lock->l_type;
      if (lock->l_type != F_UNLCK) {
            arg.lk.start = lock->l_start;
            if (lock->l_len == 0)
                  arg.lk.end = OFFSET_MAX;
            else
                  arg.lk.end = lock->l_start + lock->l_len - 1;
      }
      arg.lk.pid = lock->l_pid;
      return send_reply_ok(req, &arg, sizeof(arg));
}

00417 int fuse_reply_bmap(fuse_req_t req, uint64_t idx)
{
      struct fuse_bmap_out arg;

      memset(&arg, 0, sizeof(arg));
      arg.block = idx;

      return send_reply_ok(req, &arg, sizeof(arg));
}

00427 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)
{
      struct fuse_ioctl_out arg;
      struct iovec iov[4];
      size_t count = 1;

      memset(&arg, 0, sizeof(arg));
      arg.flags |= FUSE_IOCTL_RETRY;
      arg.in_iovs = in_count;
      arg.out_iovs = out_count;
      iov[count].iov_base = &arg;
      iov[count].iov_len = sizeof(arg);
      count++;

      if (in_count) {
            iov[count].iov_base = (void *)in_iov;
            iov[count].iov_len = sizeof(in_iov[0]) * in_count;
            count++;
      }

      if (out_count) {
            iov[count].iov_base = (void *)out_iov;
            iov[count].iov_len = sizeof(out_iov[0]) * out_count;
            count++;
      }

      return send_reply_iov(req, 0, iov, count);
}

00458 int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
{
      struct fuse_ioctl_out arg;
      struct iovec iov[3];
      size_t count = 1;

      memset(&arg, 0, sizeof(arg));
      arg.result = result;
      iov[count].iov_base = &arg;
      iov[count].iov_len = sizeof(arg);
      count++;

      if (size) {
            iov[count].iov_base = (char *) buf;
            iov[count].iov_len = size;
            count++;
      }

      return send_reply_iov(req, 0, iov, count);
}

00479 int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov,
                   int count)
{
      struct iovec *padded_iov;
      struct fuse_ioctl_out arg;
      int res;

      padded_iov = malloc((count + 2) * sizeof(struct iovec));
      if (padded_iov == NULL)
            return fuse_reply_err(req, -ENOMEM);

      memset(&arg, 0, sizeof(arg));
      arg.result = result;
      padded_iov[1].iov_base = &arg;
      padded_iov[1].iov_len = sizeof(arg);

      memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));

      res = send_reply_iov(req, 0, padded_iov, count + 2);
      free(padded_iov);

      return res;
}

00503 int fuse_reply_poll(fuse_req_t req, unsigned revents)
{
      struct fuse_poll_out arg;

      memset(&arg, 0, sizeof(arg));
      arg.revents = revents;

      return send_reply_ok(req, &arg, sizeof(arg));
}

static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      char *name = (char *) inarg;

      if (req->f->op.lookup)
            req->f->op.lookup(req, nodeid, name);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg;

      if (req->f->op.forget)
            req->f->op.forget(req, nodeid, arg->nlookup);
      else
            fuse_reply_none(req);
}

static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_file_info *fip = NULL;
      struct fuse_file_info fi;

      if (req->f->conn.proto_minor >= 9) {
            struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg;

            if (arg->getattr_flags & FUSE_GETATTR_FH) {
                  memset(&fi, 0, sizeof(fi));
                  fi.fh = arg->fh;
                  fi.fh_old = fi.fh;
                  fip = &fi;
            }
      }

      if (req->f->op.getattr)
            req->f->op.getattr(req, nodeid, fip);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg;

      if (req->f->op.setattr) {
            struct fuse_file_info *fi = NULL;
            struct fuse_file_info fi_store;
            struct stat stbuf;
            memset(&stbuf, 0, sizeof(stbuf));
            convert_attr(arg, &stbuf);
            if (arg->valid & FATTR_FH) {
                  arg->valid &= ~FATTR_FH;
                  memset(&fi_store, 0, sizeof(fi_store));
                  fi = &fi_store;
                  fi->fh = arg->fh;
                  fi->fh_old = fi->fh;
            }
            arg->valid &=
                  FUSE_SET_ATTR_MODE      |
                  FUSE_SET_ATTR_UID |
                  FUSE_SET_ATTR_GID |
                  FUSE_SET_ATTR_SIZE      |
                  FUSE_SET_ATTR_ATIME     |
                  FUSE_SET_ATTR_MTIME     |
                  FUSE_SET_ATTR_ATIME_NOW |
                  FUSE_SET_ATTR_MTIME_NOW;

            req->f->op.setattr(req, nodeid, &stbuf, arg->valid, fi);
      } else
            fuse_reply_err(req, ENOSYS);
}

static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_access_in *arg = (struct fuse_access_in *) inarg;

      if (req->f->op.access)
            req->f->op.access(req, nodeid, arg->mask);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      (void) inarg;

      if (req->f->op.readlink)
            req->f->op.readlink(req, nodeid);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg;
      char *name = PARAM(arg);

      if (req->f->conn.proto_minor >= 12)
            req->ctx.umask = arg->umask;
      else
            name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE;

      if (req->f->op.mknod)
            req->f->op.mknod(req, nodeid, name, arg->mode, arg->rdev);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg;

      if (req->f->conn.proto_minor >= 12)
            req->ctx.umask = arg->umask;

      if (req->f->op.mkdir)
            req->f->op.mkdir(req, nodeid, PARAM(arg), arg->mode);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      char *name = (char *) inarg;

      if (req->f->op.unlink)
            req->f->op.unlink(req, nodeid, name);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      char *name = (char *) inarg;

      if (req->f->op.rmdir)
            req->f->op.rmdir(req, nodeid, name);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      char *name = (char *) inarg;
      char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1;

      if (req->f->op.symlink)
            req->f->op.symlink(req, linkname, nodeid, name);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg;
      char *oldname = PARAM(arg);
      char *newname = oldname + strlen(oldname) + 1;

      if (req->f->op.rename)
            req->f->op.rename(req, nodeid, oldname, arg->newdir, newname);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_link_in *arg = (struct fuse_link_in *) inarg;

      if (req->f->op.link)
            req->f->op.link(req, arg->oldnodeid, nodeid, PARAM(arg));
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_create_in *arg = (struct fuse_create_in *) inarg;

      if (req->f->op.create) {
            struct fuse_file_info fi;
            char *name = PARAM(arg);

            memset(&fi, 0, sizeof(fi));
            fi.flags = arg->flags;

            if (req->f->conn.proto_minor >= 12)
                  req->ctx.umask = arg->umask;
            else
                  name = (char *) inarg + sizeof(struct fuse_open_in);

            req->f->op.create(req, nodeid, name, arg->mode, &fi);
      } else
            fuse_reply_err(req, ENOSYS);
}

static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.flags = arg->flags;

      if (req->f->op.open)
            req->f->op.open(req, nodeid, &fi);
      else
            fuse_reply_open(req, &fi);
}

static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_read_in *arg = (struct fuse_read_in *) inarg;

      if (req->f->op.read) {
            struct fuse_file_info fi;

            memset(&fi, 0, sizeof(fi));
            fi.fh = arg->fh;
            fi.fh_old = fi.fh;
            if (req->f->conn.proto_minor >= 9) {
                  fi.lock_owner = arg->lock_owner;
                  fi.flags = arg->flags;
            }
            req->f->op.read(req, nodeid, arg->size, arg->offset, &fi);
      } else
            fuse_reply_err(req, ENOSYS);
}

static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_write_in *arg = (struct fuse_write_in *) inarg;
      struct fuse_file_info fi;
      char *param;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;
      fi.writepage = arg->write_flags & 1;

      if (req->f->conn.proto_minor < 9) {
            param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE;
      } else {
            fi.lock_owner = arg->lock_owner;
            fi.flags = arg->flags;
            param = PARAM(arg);
      }

      if (req->f->op.write)
            req->f->op.write(req, nodeid, param, arg->size,
                         arg->offset, &fi);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;
      fi.flush = 1;
      if (req->f->conn.proto_minor >= 7)
            fi.lock_owner = arg->lock_owner;

      if (req->f->op.flush)
            req->f->op.flush(req, nodeid, &fi);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.flags = arg->flags;
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;
      if (req->f->conn.proto_minor >= 8) {
            fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0;
            fi.lock_owner = arg->lock_owner;
      }

      if (req->f->op.release)
            req->f->op.release(req, nodeid, &fi);
      else
            fuse_reply_err(req, 0);
}

static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.fsync)
            req->f->op.fsync(req, nodeid, arg->fsync_flags & 1, &fi);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_open_in *arg = (struct fuse_open_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.flags = arg->flags;

      if (req->f->op.opendir)
            req->f->op.opendir(req, nodeid, &fi);
      else
            fuse_reply_open(req, &fi);
}

static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_read_in *arg = (struct fuse_read_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.readdir)
            req->f->op.readdir(req, nodeid, arg->size, arg->offset, &fi);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_release_in *arg = (struct fuse_release_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.flags = arg->flags;
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.releasedir)
            req->f->op.releasedir(req, nodeid, &fi);
      else
            fuse_reply_err(req, 0);
}

static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.fsyncdir)
            req->f->op.fsyncdir(req, nodeid, arg->fsync_flags & 1, &fi);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      (void) nodeid;
      (void) inarg;

      if (req->f->op.statfs)
            req->f->op.statfs(req, nodeid);
      else {
            struct statvfs buf = {
                  .f_namemax = 255,
                  .f_bsize = 512,
            };
            fuse_reply_statfs(req, &buf);
      }
}

static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg;
      char *name = PARAM(arg);
      char *value = name + strlen(name) + 1;

      if (req->f->op.setxattr)
            req->f->op.setxattr(req, nodeid, name, value, arg->size,
                            arg->flags);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;

      if (req->f->op.getxattr)
            req->f->op.getxattr(req, nodeid, PARAM(arg), arg->size);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg;

      if (req->f->op.listxattr)
            req->f->op.listxattr(req, nodeid, arg->size);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      char *name = (char *) inarg;

      if (req->f->op.removexattr)
            req->f->op.removexattr(req, nodeid, name);
      else
            fuse_reply_err(req, ENOSYS);
}

static void convert_fuse_file_lock(struct fuse_file_lock *fl,
                           struct flock *flock)
{
      memset(flock, 0, sizeof(struct flock));
      flock->l_type = fl->type;
      flock->l_whence = SEEK_SET;
      flock->l_start = fl->start;
      if (fl->end == OFFSET_MAX)
            flock->l_len = 0;
      else
            flock->l_len = fl->end - fl->start + 1;
      flock->l_pid = fl->pid;
}

static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
      struct fuse_file_info fi;
      struct flock flock;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.lock_owner = arg->owner;

      convert_fuse_file_lock(&arg->lk, &flock);
      if (req->f->op.getlk)
            req->f->op.getlk(req, nodeid, &fi, &flock);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid,
                      const void *inarg, int sleep)
{
      struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg;
      struct fuse_file_info fi;
      struct flock flock;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.lock_owner = arg->owner;

      convert_fuse_file_lock(&arg->lk, &flock);
      if (req->f->op.setlk)
            req->f->op.setlk(req, nodeid, &fi, &flock, sleep);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      do_setlk_common(req, nodeid, inarg, 0);
}

static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      do_setlk_common(req, nodeid, inarg, 1);
}

static int find_interrupted(struct fuse_ll *f, struct fuse_req *req)
{
      struct fuse_req *curr;

      for (curr = f->list.next; curr != &f->list; curr = curr->next) {
            if (curr->unique == req->u.i.unique) {
                  fuse_interrupt_func_t func;
                  void *data;

                  curr->ctr++;
                  pthread_mutex_unlock(&f->lock);

                  /* Ugh, ugly locking */
                  pthread_mutex_lock(&curr->lock);
                  pthread_mutex_lock(&f->lock);
                  curr->interrupted = 1;
                  func = curr->u.ni.func;
                  data = curr->u.ni.data;
                  pthread_mutex_unlock(&f->lock);
                  if (func)
                        func(curr, data);
                  pthread_mutex_unlock(&curr->lock);

                  pthread_mutex_lock(&f->lock);
                  curr->ctr--;
                  if (!curr->ctr)
                        destroy_req(curr);

                  return 1;
            }
      }
      for (curr = f->interrupts.next; curr != &f->interrupts;
           curr = curr->next) {
            if (curr->u.i.unique == req->u.i.unique)
                  return 1;
      }
      return 0;
}

static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg;
      struct fuse_ll *f = req->f;

      (void) nodeid;
      if (f->debug)
            fprintf(stderr, "INTERRUPT: %llu\n",
                  (unsigned long long) arg->unique);

      req->u.i.unique = arg->unique;

      pthread_mutex_lock(&f->lock);
      if (find_interrupted(f, req))
            destroy_req(req);
      else
            list_add_req(req, &f->interrupts);
      pthread_mutex_unlock(&f->lock);
}

static struct fuse_req *check_interrupt(struct fuse_ll *f, struct fuse_req *req)
{
      struct fuse_req *curr;

      for (curr = f->interrupts.next; curr != &f->interrupts;
           curr = curr->next) {
            if (curr->u.i.unique == req->unique) {
                  req->interrupted = 1;
                  list_del_req(curr);
                  free(curr);
                  return NULL;
            }
      }
      curr = f->interrupts.next;
      if (curr != &f->interrupts) {
            list_del_req(curr);
            list_init_req(curr);
            return curr;
      } else
            return NULL;
}

static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg;

      if (req->f->op.bmap)
            req->f->op.bmap(req, nodeid, arg->blocksize, arg->block);
      else
            fuse_reply_err(req, ENOSYS);
}

static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg;
      unsigned int flags = arg->flags;
      void *in_buf = arg->in_size ? PARAM(arg) : NULL;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.ioctl)
            req->f->op.ioctl(req, nodeid, arg->cmd,
                         (void *)(uintptr_t)arg->arg, &fi, flags,
                         in_buf, arg->in_size, arg->out_size);
      else
            fuse_reply_err(req, ENOSYS);
}

01110 void fuse_pollhandle_destroy(struct fuse_pollhandle *ph)
{
      free(ph);
}

static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg;
      struct fuse_file_info fi;

      memset(&fi, 0, sizeof(fi));
      fi.fh = arg->fh;
      fi.fh_old = fi.fh;

      if (req->f->op.poll) {
            struct fuse_pollhandle *ph = NULL;

            if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) {
                  ph = malloc(sizeof(struct fuse_pollhandle));
                  if (ph == NULL) {
                        fuse_reply_err(req, ENOMEM);
                        return;
                  }
                  ph->kh = arg->kh;
                  ph->ch = req->ch;
                  ph->f = req->f;
            }

            req->f->op.poll(req, nodeid, &fi, ph);
      } else {
            fuse_reply_err(req, ENOSYS);
      }
}

static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_init_in *arg = (struct fuse_init_in *) inarg;
      struct fuse_init_out outarg;
      struct fuse_ll *f = req->f;
      size_t bufsize = fuse_chan_bufsize(req->ch);

      (void) nodeid;
      if (f->debug) {
            fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
            if (arg->major == 7 && arg->minor >= 6) {
                  fprintf(stderr, "flags=0x%08x\n", arg->flags);
                  fprintf(stderr, "max_readahead=0x%08x\n",
                        arg->max_readahead);
            }
      }
      f->conn.proto_major = arg->major;
      f->conn.proto_minor = arg->minor;
      f->conn.capable = 0;
      f->conn.want = 0;

      memset(&outarg, 0, sizeof(outarg));
      outarg.major = FUSE_KERNEL_VERSION;
      outarg.minor = FUSE_KERNEL_MINOR_VERSION;

      if (arg->major < 7) {
            fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
                  arg->major, arg->minor);
            fuse_reply_err(req, EPROTO);
            return;
      }

      if (arg->major > 7) {
            /* Wait for a second INIT request with a 7.X version */
            send_reply_ok(req, &outarg, sizeof(outarg));
            return;
      }

      if (arg->minor >= 6) {
            if (f->conn.async_read)
                  f->conn.async_read = arg->flags & FUSE_ASYNC_READ;
            if (arg->max_readahead < f->conn.max_readahead)
                  f->conn.max_readahead = arg->max_readahead;
            if (arg->flags & FUSE_ASYNC_READ)
                  f->conn.capable |= FUSE_CAP_ASYNC_READ;
            if (arg->flags & FUSE_POSIX_LOCKS)
                  f->conn.capable |= FUSE_CAP_POSIX_LOCKS;
            if (arg->flags & FUSE_ATOMIC_O_TRUNC)
                  f->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
            if (arg->flags & FUSE_EXPORT_SUPPORT)
                  f->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
            if (arg->flags & FUSE_BIG_WRITES)
                  f->conn.capable |= FUSE_CAP_BIG_WRITES;
            if (arg->flags & FUSE_DONT_MASK)
                  f->conn.capable |= FUSE_CAP_DONT_MASK;
      } else {
            f->conn.async_read = 0;
            f->conn.max_readahead = 0;
      }

      if (f->atomic_o_trunc)
            f->conn.want |= FUSE_CAP_ATOMIC_O_TRUNC;
      if (f->op.getlk && f->op.setlk && !f->no_remote_lock)
            f->conn.want |= FUSE_CAP_POSIX_LOCKS;
      if (f->big_writes)
            f->conn.want |= FUSE_CAP_BIG_WRITES;

      if (bufsize < FUSE_MIN_READ_BUFFER) {
            fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
                  bufsize);
            bufsize = FUSE_MIN_READ_BUFFER;
      }

      bufsize -= 4096;
      if (bufsize < f->conn.max_write)
            f->conn.max_write = bufsize;

      f->got_init = 1;
      if (f->op.init)
            f->op.init(f->userdata, &f->conn);

      if (f->conn.async_read || (f->conn.want & FUSE_CAP_ASYNC_READ))
            outarg.flags |= FUSE_ASYNC_READ;
      if (f->conn.want & FUSE_CAP_POSIX_LOCKS)
            outarg.flags |= FUSE_POSIX_LOCKS;
      if (f->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
            outarg.flags |= FUSE_ATOMIC_O_TRUNC;
      if (f->conn.want & FUSE_CAP_EXPORT_SUPPORT)
            outarg.flags |= FUSE_EXPORT_SUPPORT;
      if (f->conn.want & FUSE_CAP_BIG_WRITES)
            outarg.flags |= FUSE_BIG_WRITES;
      if (f->conn.want & FUSE_CAP_DONT_MASK)
            outarg.flags |= FUSE_DONT_MASK;
      outarg.max_readahead = f->conn.max_readahead;
      outarg.max_write = f->conn.max_write;

      if (f->debug) {
            fprintf(stderr, "   INIT: %u.%u\n", outarg.major, outarg.minor);
            fprintf(stderr, "   flags=0x%08x\n", outarg.flags);
            fprintf(stderr, "   max_readahead=0x%08x\n",
                  outarg.max_readahead);
            fprintf(stderr, "   max_write=0x%08x\n", outarg.max_write);
      }

      send_reply_ok(req, &outarg, arg->minor < 5 ? 8 : sizeof(outarg));
}

static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
{
      struct fuse_ll *f = req->f;

      (void) nodeid;
      (void) inarg;

      f->got_destroy = 1;
      if (f->op.destroy)
            f->op.destroy(f->userdata);

      send_reply_ok(req, NULL, 0);
}

static int send_notify_iov(struct fuse_ll *f, struct fuse_chan *ch,
                     int notify_code, struct iovec *iov, int count)
{
      struct fuse_out_header out;

      out.unique = 0;
      out.error = notify_code;
      iov[0].iov_base = &out;
      iov[0].iov_len = sizeof(struct fuse_out_header);
      out.len = iov_length(iov, count);

      if (f->debug)
            fprintf(stderr, "NOTIFY: code=%d count=%d length=%u\n",
                  notify_code, count, out.len);

      return fuse_chan_send(ch, iov, count);
}

01283 int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
{
      if (ph != NULL) {
            struct fuse_notify_poll_wakeup_out outarg;
            struct iovec iov[2];

            outarg.kh = ph->kh;

            iov[1].iov_base = &outarg;
            iov[1].iov_len = sizeof(outarg);

            return send_notify_iov(ph->f, ph->ch, FUSE_NOTIFY_POLL, iov, 2);
      } else {
            return 0;
      }
}

01300 int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, fuse_ino_t ino,
                                     off_t off, off_t len)
{
      struct fuse_notify_inval_inode_out outarg;
      struct fuse_ll *f;
      struct iovec iov[2];

      if (!ch)
            return -EINVAL;

      f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
      if (!f)
            return -ENODEV;

      outarg.ino = ino;
      outarg.off = off;
      outarg.len = len;

      iov[1].iov_base = &outarg;
      iov[1].iov_len = sizeof(outarg);

      return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2);
}

01324 int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, fuse_ino_t parent,
                                     const char *name, size_t namelen)
{
      struct fuse_notify_inval_entry_out outarg;
      struct fuse_ll *f;
      struct iovec iov[3];

      if (!ch)
            return -EINVAL;

      f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch));
      if (!f)
            return -ENODEV;

      outarg.parent = parent;
      outarg.namelen = namelen;
      outarg.padding = 0;

      iov[1].iov_base = &outarg;
      iov[1].iov_len = sizeof(outarg);
      iov[2].iov_base = (void *)name;
      iov[2].iov_len = namelen + 1;

      return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
}

01350 void *fuse_req_userdata(fuse_req_t req)
{
      return req->f->userdata;
}

01355 const struct fuse_ctx *fuse_req_ctx(fuse_req_t req)
{
      return &req->ctx;
}

/*
 * The size of fuse_ctx got extended, so need to be careful about
 * incompatibility (i.e. a new binary cannot work with an old
 * library).
 */
const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req);
const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req)
{
      return fuse_req_ctx(req);
}
FUSE_SYMVER(".symver fuse_req_ctx_compat24,fuse_req_ctx@FUSE_2.4");


01373 void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func,
                       void *data)
{
      pthread_mutex_lock(&req->lock);
      pthread_mutex_lock(&req->f->lock);
      req->u.ni.func = func;
      req->u.ni.data = data;
      pthread_mutex_unlock(&req->f->lock);
      if (req->interrupted && func)
            func(req, data);
      pthread_mutex_unlock(&req->lock);
}

01386 int fuse_req_interrupted(fuse_req_t req)
{
      int interrupted;

      pthread_mutex_lock(&req->f->lock);
      interrupted = req->interrupted;
      pthread_mutex_unlock(&req->f->lock);

      return interrupted;
}

static struct {
      void (*func)(fuse_req_t, fuse_ino_t, const void *);
      const char *name;
} fuse_ll_ops[] = {
      [FUSE_LOOKUP]        = { do_lookup,      "LOOKUP"          },
      [FUSE_FORGET]        = { do_forget,      "FORGET"          },
      [FUSE_GETATTR]       = { do_getattr,     "GETATTR"     },
      [FUSE_SETATTR]       = { do_setattr,     "SETATTR"     },
      [FUSE_READLINK]      = { do_readlink,    "READLINK"    },
      [FUSE_SYMLINK]       = { do_symlink,     "SYMLINK"     },
      [FUSE_MKNOD]         = { do_mknod,       "MKNOD"           },
      [FUSE_MKDIR]         = { do_mkdir,       "MKDIR"           },
      [FUSE_UNLINK]        = { do_unlink,      "UNLINK"          },
      [FUSE_RMDIR]         = { do_rmdir,       "RMDIR"           },
      [FUSE_RENAME]        = { do_rename,      "RENAME"          },
      [FUSE_LINK]    = { do_link,          "LINK"          },
      [FUSE_OPEN]    = { do_open,          "OPEN"          },
      [FUSE_READ]    = { do_read,          "READ"          },
      [FUSE_WRITE]         = { do_write,       "WRITE"           },
      [FUSE_STATFS]        = { do_statfs,      "STATFS"          },
      [FUSE_RELEASE]       = { do_release,     "RELEASE"     },
      [FUSE_FSYNC]         = { do_fsync,       "FSYNC"           },
      [FUSE_SETXATTR]      = { do_setxattr,    "SETXATTR"    },
      [FUSE_GETXATTR]      = { do_getxattr,    "GETXATTR"    },
      [FUSE_LISTXATTR]   = { do_listxattr,   "LISTXATTR"   },
      [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" },
      [FUSE_FLUSH]         = { do_flush,       "FLUSH"           },
      [FUSE_INIT]    = { do_init,          "INIT"          },
      [FUSE_OPENDIR]       = { do_opendir,     "OPENDIR"     },
      [FUSE_READDIR]       = { do_readdir,     "READDIR"     },
      [FUSE_RELEASEDIR]  = { do_releasedir,  "RELEASEDIR"  },
      [FUSE_FSYNCDIR]      = { do_fsyncdir,    "FSYNCDIR"    },
      [FUSE_GETLK]         = { do_getlk,       "GETLK"           },
      [FUSE_SETLK]         = { do_setlk,       "SETLK"           },
      [FUSE_SETLKW]        = { do_setlkw,      "SETLKW"          },
      [FUSE_ACCESS]        = { do_access,      "ACCESS"          },
      [FUSE_CREATE]        = { do_create,      "CREATE"          },
      [FUSE_INTERRUPT]   = { do_interrupt,   "INTERRUPT"   },
      [FUSE_BMAP]    = { do_bmap,          "BMAP"          },
      [FUSE_IOCTL]         = { do_ioctl,       "IOCTL"           },
      [FUSE_POLL]    = { do_poll,        "POLL"      },
      [FUSE_DESTROY]       = { do_destroy,     "DESTROY"     },
      [CUSE_INIT]    = { cuse_lowlevel_init, "CUSE_INIT"   },
};

#define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0]))

static const char *opname(enum fuse_opcode opcode)
{
      if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name)
            return "???";
      else
            return fuse_ll_ops[opcode].name;
}

static void fuse_ll_process(void *data, const char *buf, size_t len,
                      struct fuse_chan *ch)
{
      struct fuse_ll *f = (struct fuse_ll *) data;
      struct fuse_in_header *in = (struct fuse_in_header *) buf;
      const void *inarg = buf + sizeof(struct fuse_in_header);
      struct fuse_req *req;
      int err;

      if (f->debug)
            fprintf(stderr,
                  "unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %zu\n",
                  (unsigned long long) in->unique,
                  opname((enum fuse_opcode) in->opcode), in->opcode,
                  (unsigned long) in->nodeid, len);

      req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req));
      if (req == NULL) {
            fprintf(stderr, "fuse: failed to allocate request\n");
            return;
      }

      req->f = f;
      req->unique = in->unique;
      req->ctx.uid = in->uid;
      req->ctx.gid = in->gid;
      req->ctx.pid = in->pid;
      req->ch = ch;
      req->ctr = 1;
      list_init_req(req);
      fuse_mutex_init(&req->lock);

      err = EIO;
      if (!f->got_init) {
            enum fuse_opcode expected;

            expected = f->cuse_data ? CUSE_INIT : FUSE_INIT;
            if (in->opcode != expected)
                  goto reply_err;
      } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT)
            goto reply_err;

      err = EACCES;
      if (f->allow_root && in->uid != f->owner && in->uid != 0 &&
             in->opcode != FUSE_INIT && in->opcode != FUSE_READ &&
             in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC &&
             in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR &&
             in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR)
            goto reply_err;

      err = ENOSYS;
      if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func)
            goto reply_err;
      if (in->opcode != FUSE_INTERRUPT) {
            struct fuse_req *intr;
            pthread_mutex_lock(&f->lock);
            intr = check_interrupt(f, req);
            list_add_req(req, &f->list);
            pthread_mutex_unlock(&f->lock);
            if (intr)
                  fuse_reply_err(intr, EAGAIN);
      }
      fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg);
      return;

 reply_err:
      fuse_reply_err(req, err);
}

enum {
      KEY_HELP,
      KEY_VERSION,
};

static struct fuse_opt fuse_ll_opts[] = {
      { "debug", offsetof(struct fuse_ll, debug), 1 },
      { "-d", offsetof(struct fuse_ll, debug), 1 },
      { "allow_root", offsetof(struct fuse_ll, allow_root), 1 },
      { "max_write=%u", offsetof(struct fuse_ll, conn.max_write), 0 },
      { "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 },
      { "async_read", offsetof(struct fuse_ll, conn.async_read), 1 },
      { "sync_read", offsetof(struct fuse_ll, conn.async_read), 0 },
      { "atomic_o_trunc", offsetof(struct fuse_ll, atomic_o_trunc), 1},
      { "no_remote_lock", offsetof(struct fuse_ll, no_remote_lock), 1},
      { "big_writes", offsetof(struct fuse_ll, big_writes), 1},
      FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD),
      FUSE_OPT_KEY("-h", KEY_HELP),
      FUSE_OPT_KEY("--help", KEY_HELP),
      FUSE_OPT_KEY("-V", KEY_VERSION),
      FUSE_OPT_KEY("--version", KEY_VERSION),
      FUSE_OPT_END
};

static void fuse_ll_version(void)
{
      fprintf(stderr, "using FUSE kernel interface version %i.%i\n",
            FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
}

static void fuse_ll_help(void)
{
      fprintf(stderr,
"    -o max_write=N         set maximum size of write requests\n"
"    -o max_readahead=N     set maximum readahead\n"
"    -o async_read          perform reads asynchronously (default)\n"
"    -o sync_read           perform reads synchronously\n"
"    -o atomic_o_trunc      enable atomic open+truncate support\n"
"    -o big_writes          enable larger than 4kB writes\n"
"    -o no_remote_lock      disable remote file locking\n");
}

static int fuse_ll_opt_proc(void *data, const char *arg, int key,
                      struct fuse_args *outargs)
{
      (void) data; (void) outargs;

      switch (key) {
      case KEY_HELP:
            fuse_ll_help();
            break;

      case KEY_VERSION:
            fuse_ll_version();
            break;

      default:
            fprintf(stderr, "fuse: unknown option `%s'\n", arg);
      }

      return -1;
}

int fuse_lowlevel_is_lib_option(const char *opt)
{
      return fuse_opt_match(fuse_ll_opts, opt);
}

static void fuse_ll_destroy(void *data)
{
      struct fuse_ll *f = (struct fuse_ll *) data;

      if (f->got_init && !f->got_destroy) {
            if (f->op.destroy)
                  f->op.destroy(f->userdata);
      }

      pthread_mutex_destroy(&f->lock);
      free(f->cuse_data);
      free(f);
}

/*
 * always call fuse_lowlevel_new_common() internally, to work around a
 * misfeature in the FreeBSD runtime linker, which links the old
 * version of a symbol to internal references.
 */
struct fuse_session *fuse_lowlevel_new_common(struct fuse_args *args,
                                    const struct fuse_lowlevel_ops *op,
                                    size_t op_size, void *userdata)
{
      struct fuse_ll *f;
      struct fuse_session *se;
      struct fuse_session_ops sop = {
            .process = fuse_ll_process,
            .destroy = fuse_ll_destroy,
      };

      if (sizeof(struct fuse_lowlevel_ops) < op_size) {
            fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
            op_size = sizeof(struct fuse_lowlevel_ops);
      }

      f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll));
      if (f == NULL) {
            fprintf(stderr, "fuse: failed to allocate fuse object\n");
            goto out;
      }

      f->conn.async_read = 1;
      f->conn.max_write = UINT_MAX;
      f->conn.max_readahead = UINT_MAX;
      f->atomic_o_trunc = 0;
      list_init_req(&f->list);
      list_init_req(&f->interrupts);
      fuse_mutex_init(&f->lock);

      if (fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1)
            goto out_free;

      if (f->debug)
            fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION);

      memcpy(&f->op, op, op_size);
      f->owner = getuid();
      f->userdata = userdata;

      se = fuse_session_new(&sop, f);
      if (!se)
            goto out_free;

      return se;

out_free:
      free(f);
out:
      return NULL;
}


01661 struct fuse_session *fuse_lowlevel_new(struct fuse_args *args,
                               const struct fuse_lowlevel_ops *op,
                               size_t op_size, void *userdata)
{
      return fuse_lowlevel_new_common(args, op, op_size, userdata);
}

#ifdef linux
int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
{
      char *buf;
      size_t bufsize = 1024;
      char path[128];
      int ret;
      int fd;
      unsigned long pid = req->ctx.pid;
      char *s;

      sprintf(path, "/proc/%lu/task/%lu/status", pid, pid);

retry:
      buf = malloc(bufsize);
      if (buf == NULL)
            return -ENOMEM;

      ret = -EIO;
      fd = open(path, O_RDONLY);
      if (fd == -1)
            goto out_free;

      ret = read(fd, buf, bufsize);
      close(fd);
      if (ret == -1) {
            ret = -EIO;
            goto out_free;
      }

      if (ret == bufsize) {
            free(buf);
            bufsize *= 4;
            goto retry;
      }

      ret = -EIO;
      s = strstr(buf, "\nGroups:");
      if (s == NULL)
            goto out_free;

      s += 8;
      ret = 0;
      while (1) {
            char *end;
            unsigned long val = strtoul(s, &end, 0);
            if (end == s)
                  break;

            s = end;
            if (ret < size)
                  list[ret] = val;
            ret++;
      }

out_free:
      free(buf);
      return ret;
}
#else /* linux */
/*
 * This is currently not implemented on other than Linux...
 */
01731 int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[])
{
      return -ENOSYS;
}
#endif

#ifndef __FreeBSD__

static void fill_open_compat(struct fuse_open_out *arg,
                       const struct fuse_file_info_compat *f)
{
      arg->fh = f->fh;
      if (f->direct_io)
            arg->open_flags |= FOPEN_DIRECT_IO;
      if (f->keep_cache)
            arg->open_flags |= FOPEN_KEEP_CACHE;
}

static void convert_statfs_compat(const struct statfs *compatbuf,
                          struct statvfs *buf)
{
      buf->f_bsize      = compatbuf->f_bsize;
      buf->f_blocks     = compatbuf->f_blocks;
      buf->f_bfree      = compatbuf->f_bfree;
      buf->f_bavail     = compatbuf->f_bavail;
      buf->f_files      = compatbuf->f_files;
      buf->f_ffree      = compatbuf->f_ffree;
      buf->f_namemax    = compatbuf->f_namelen;
}

int fuse_reply_open_compat(fuse_req_t req,
                     const struct fuse_file_info_compat *f)
{
      struct fuse_open_out arg;

      memset(&arg, 0, sizeof(arg));
      fill_open_compat(&arg, f);
      return send_reply_ok(req, &arg, sizeof(arg));
}

int fuse_reply_statfs_compat(fuse_req_t req, const struct statfs *stbuf)
{
      struct statvfs newbuf;

      memset(&newbuf, 0, sizeof(newbuf));
      convert_statfs_compat(stbuf, &newbuf);

      return fuse_reply_statfs(req, &newbuf);
}

struct fuse_session *fuse_lowlevel_new_compat(const char *opts,
                        const struct fuse_lowlevel_ops_compat *op,
                        size_t op_size, void *userdata)
{
      struct fuse_session *se;
      struct fuse_args args = FUSE_ARGS_INIT(0, NULL);

      if (opts &&
          (fuse_opt_add_arg(&args, "") == -1 ||
           fuse_opt_add_arg(&args, "-o") == -1 ||
           fuse_opt_add_arg(&args, opts) == -1)) {
            fuse_opt_free_args(&args);
            return NULL;
      }
      se = fuse_lowlevel_new(&args, (const struct fuse_lowlevel_ops *) op,
                         op_size, userdata);
      fuse_opt_free_args(&args);

      return se;
}

01802 struct fuse_ll_compat_conf {
      unsigned max_read;
      int set_max_read;
};

static const struct fuse_opt fuse_ll_opts_compat[] = {
      { "max_read=", offsetof(struct fuse_ll_compat_conf, set_max_read), 1 },
      { "max_read=%u", offsetof(struct fuse_ll_compat_conf, max_read), 0 },
      FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_KEEP),
      FUSE_OPT_END
};

int fuse_sync_compat_args(struct fuse_args *args)
{
      struct fuse_ll_compat_conf conf;

      memset(&conf, 0, sizeof(conf));
      if (fuse_opt_parse(args, &conf, fuse_ll_opts_compat, NULL) == -1)
            return -1;

      if (fuse_opt_insert_arg(args, 1, "-osync_read"))
            return -1;

      if (conf.set_max_read) {
            char tmpbuf[64];

            sprintf(tmpbuf, "-omax_readahead=%u", conf.max_read);
            if (fuse_opt_insert_arg(args, 1, tmpbuf) == -1)
                  return -1;
      }
      return 0;
}

FUSE_SYMVER(".symver fuse_reply_statfs_compat,fuse_reply_statfs@FUSE_2.4");
FUSE_SYMVER(".symver fuse_reply_open_compat,fuse_reply_open@FUSE_2.4");
FUSE_SYMVER(".symver fuse_lowlevel_new_compat,fuse_lowlevel_new@FUSE_2.4");

#else /* __FreeBSD__ */

int fuse_sync_compat_args(struct fuse_args *args)
{
      (void) args;
      return 0;
}

#endif /* __FreeBSD__ */

struct fuse_session *fuse_lowlevel_new_compat25(struct fuse_args *args,
                        const struct fuse_lowlevel_ops_compat25 *op,
                        size_t op_size, void *userdata)
{
      if (fuse_sync_compat_args(args) == -1)
            return NULL;

      return fuse_lowlevel_new_common(args,
                              (const struct fuse_lowlevel_ops *) op,
                              op_size, userdata);
}

FUSE_SYMVER(".symver fuse_lowlevel_new_compat25,fuse_lowlevel_new@FUSE_2.5");

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