fs/orangefs/pvfs2-bufmap.h

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 #ifndef __PVFS2_BUFMAP_H
   8 #define __PVFS2_BUFMAP_H
   9
  10 /* used to describe mapped buffers */
  11 struct pvfs_bufmap_desc {
  12         void *uaddr;                    /* user space address pointer */
  13         struct page **page_array;       /* array of mapped pages */
  14         int array_count;                /* size of above arrays */
  15         struct list_head list_link;
  16 };
  17
  18 struct pvfs2_bufmap;
  19
  20 struct pvfs2_bufmap *pvfs2_bufmap_ref(void);
  21 void pvfs2_bufmap_unref(struct pvfs2_bufmap *bufmap);
  22
  23 /*
  24  * pvfs_bufmap_size_query is now an inline function because buffer
  25  * sizes are not hardcoded
  26  */
  27 int pvfs_bufmap_size_query(void);
  28
  29 int pvfs_bufmap_shift_query(void);
  30
  31 int pvfs_bufmap_initialize(struct PVFS_dev_map_desc *user_desc);
  32
  33 int get_bufmap_init(void);
  34
  35 void pvfs_bufmap_finalize(void);
  36
  37 int pvfs_bufmap_get(struct pvfs2_bufmap **mapp, int *buffer_index);
  38
  39 void pvfs_bufmap_put(struct pvfs2_bufmap *bufmap, int buffer_index);
  40
  41 int readdir_index_get(struct pvfs2_bufmap **mapp, int *buffer_index);
  42
  43 void readdir_index_put(struct pvfs2_bufmap *bufmap, int buffer_index);
  44
  45 int pvfs_bufmap_copy_from_iovec(struct pvfs2_bufmap *bufmap,
  46                                 struct iov_iter *iter,
  47                                 int buffer_index,
  48                                 size_t size);
  49
  50 int pvfs_bufmap_copy_to_iovec(struct pvfs2_bufmap *bufmap,
  51                               struct iov_iter *iter,
  52                               int buffer_index);
  53
  54 size_t pvfs_bufmap_copy_to_user_task_iovec(struct task_struct *tsk,
  55                                            struct iovec *iovec,
  56                                            unsigned long nr_segs,
  57                                            struct pvfs2_bufmap *bufmap,
  58                                            int buffer_index,
  59                                            size_t bytes_to_be_copied);
  60
  61 #endif /* __PVFS2_BUFMAP_H */