plugins/sh/methods.h

   1 /* nbdkit
   2  * Copyright (C) 2018 Red Hat Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef NBDKIT_METHODS_H
  34 #define NBDKIT_METHODS_H
  35
  36 /* Defined by the plugin, returns the script name.  For sh_dump_plugin
  37  * and sh_thread_model ONLY it is possible for this function to return
  38  * NULL.  From all other contexts it must return a script name.
  39  */
  40 extern const char *get_script (const char *method);
  41
  42 extern void sh_dump_plugin (void);
  43 extern int sh_thread_model (void);
  44 extern void *sh_open (int readonly);
  45 extern void sh_close (void *handle);
  46 extern int64_t sh_get_size (void *handle);
  47 extern int sh_pread (void *handle, void *buf, uint32_t count, uint64_t offset,
  48                      uint32_t flags);
  49 extern int sh_pwrite (void *handle, const void *buf, uint32_t count,
  50                       uint64_t offset, uint32_t flags);
  51 extern int sh_can_write (void *handle);
  52 extern int sh_can_flush (void *handle);
  53 extern int sh_is_rotational (void *handle);
  54 extern int sh_can_trim (void *handle);
  55 extern int sh_can_zero (void *handle);
  56 extern int sh_can_extents (void *handle);
  57 extern int sh_can_fua (void *handle);
  58 extern int sh_can_multi_conn (void *handle);
  59 extern int sh_can_cache (void *handle);
  60 extern int sh_can_fast_zero (void *handle);
  61 extern int sh_flush (void *handle, uint32_t flags);
  62 extern int sh_trim (void *handle, uint32_t count, uint64_t offset,
  63                     uint32_t flags);
  64 extern int sh_zero (void *handle, uint32_t count, uint64_t offset,
  65                     uint32_t flags);
  66 extern int sh_extents (void *handle, uint32_t count, uint64_t offset,
  67                        uint32_t flags, struct nbdkit_extents *extents);
  68 extern int sh_cache (void *handle, uint32_t count, uint64_t offset,
  69                      uint32_t flags);
  70
  71 #endif /* NBDKIT_METHODS_H */