tools/virtiofsd/fuse_i.h

   1 /*
   2  * FUSE: Filesystem in Userspace
   3  * Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
   4  *
   5  * This program can be distributed under the terms of the GNU LGPLv2.
   6  * See the file COPYING.LIB
   7  */
   8
   9 #include "fuse.h"
  10 #include "fuse_lowlevel.h"
  11
  12 struct fuse_req {
  13     struct fuse_session *se;
  14     uint64_t unique;
  15     int ctr;
  16     pthread_mutex_t lock;
  17     struct fuse_ctx ctx;
  18     struct fuse_chan *ch;
  19     int interrupted;
  20     unsigned int ioctl_64bit:1;
  21     union {
  22         struct {
  23             uint64_t unique;
  24         } i;
  25         struct {
  26             fuse_interrupt_func_t func;
  27             void *data;
  28         } ni;
  29     } u;
  30     struct fuse_req *next;
  31     struct fuse_req *prev;
  32 };
  33
  34 struct fuse_notify_req {
  35     uint64_t unique;
  36     void (*reply)(struct fuse_notify_req *, fuse_req_t, fuse_ino_t,
  37                   const void *, const struct fuse_buf *);
  38     struct fuse_notify_req *next;
  39     struct fuse_notify_req *prev;
  40 };
  41
  42 struct fuse_session {
  43     char *mountpoint;
  44     volatile int exited;
  45     int fd;
  46     int debug;
  47     int deny_others;
  48     struct fuse_lowlevel_ops op;
  49     int got_init;
  50     struct cuse_data *cuse_data;
  51     void *userdata;
  52     uid_t owner;
  53     struct fuse_conn_info conn;
  54     struct fuse_req list;
  55     struct fuse_req interrupts;
  56     pthread_mutex_t lock;
  57     int got_destroy;
  58     int broken_splice_nonblock;
  59     uint64_t notify_ctr;
  60     struct fuse_notify_req notify_list;
  61     size_t bufsize;
  62     int error;
  63 };
  64
  65 struct fuse_chan {
  66     pthread_mutex_t lock;
  67     int ctr;
  68     int fd;
  69 };
  70
  71 /**
  72  * Filesystem module
  73  *
  74  * Filesystem modules are registered with the FUSE_REGISTER_MODULE()
  75  * macro.
  76  *
  77  */
  78 struct fuse_module {
  79     char *name;
  80     fuse_module_factory_t factory;
  81     struct fuse_module *next;
  82     struct fusemod_so *so;
  83     int ctr;
  84 };
  85
  86 int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov,
  87                                int count);
  88 void fuse_free_req(fuse_req_t req);
  89
  90 void fuse_session_process_buf_int(struct fuse_session *se,
  91                                   const struct fuse_buf *buf,
  92                                   struct fuse_chan *ch);
  93
  94
  95 #define FUSE_MAX_MAX_PAGES 256
  96 #define FUSE_DEFAULT_MAX_PAGES_PER_REQ 32
  97
  98 /* room needed in buffer to accommodate header */
  99 #define FUSE_BUFFER_HEADER_SIZE 0x1000