release/src-rt-6.x/linux/linux-2.6/fs/ocfs2/aops.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * Copyright (C) 2002, 2004, 2005 Oracle.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public
  17  * License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA.
  20  */
  21
  22 #ifndef OCFS2_AOPS_H
  23 #define OCFS2_AOPS_H
  24
  25 int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
  26                                unsigned from, unsigned to);
  27
  28 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  29                                                          struct page *page,
  30                                                          unsigned from,
  31                                                          unsigned to);
  32
  33 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  34                           struct inode *inode, unsigned int from,
  35                           unsigned int to, int new);
  36
  37 int walk_page_buffers(  handle_t *handle,
  38                         struct buffer_head *head,
  39                         unsigned from,
  40                         unsigned to,
  41                         int *partial,
  42                         int (*fn)(      handle_t *handle,
  43                                         struct buffer_head *bh));
  44
  45 struct ocfs2_write_ctxt;
  46 typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
  47                                 u64 *, unsigned int *, unsigned int *);
  48
  49 ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
  50                                      size_t count, ocfs2_page_writer *actor,
  51                                      void *priv);
  52
  53 struct ocfs2_write_ctxt {
  54         size_t                          w_count;
  55         loff_t                          w_pos;
  56         u32                             w_cpos;
  57         unsigned int                    w_finished_copy;
  58
  59         /* This is true if page_size > cluster_size */
  60         unsigned int                    w_large_pages;
  61
  62         /* Filler callback and private data */
  63         ocfs2_page_writer               *w_write_data_page;
  64         void                            *w_private;
  65
  66         /* Only valid for the filler callback */
  67         struct page                     *w_this_page;
  68         unsigned int                    w_this_page_new;
  69 };
  70
  71 struct ocfs2_buffered_write_priv {
  72         char                            *b_src_buf;
  73         const struct iovec              *b_cur_iov; /* Current iovec */
  74         size_t                          b_cur_off; /* Offset in the
  75                                                     * current iovec */
  76 };
  77 int ocfs2_map_and_write_user_data(struct inode *inode,
  78                                   struct ocfs2_write_ctxt *wc,
  79                                   u64 *p_blkno,
  80                                   unsigned int *ret_from,
  81                                   unsigned int *ret_to);
  82
  83 struct ocfs2_splice_write_priv {
  84         struct splice_desc              *s_sd;
  85         struct pipe_buffer              *s_buf;
  86         struct pipe_inode_info          *s_pipe;
  87         /* Neither offset value is ever larger than one page */
  88         unsigned int                    s_offset;
  89         unsigned int                    s_buf_offset;
  90 };
  91 int ocfs2_map_and_write_splice_data(struct inode *inode,
  92                                     struct ocfs2_write_ctxt *wc,
  93                                     u64 *p_blkno,
  94                                     unsigned int *ret_from,
  95                                     unsigned int *ret_to);
  96
  97 /* all ocfs2_dio_end_io()'s fault */
  98 #define ocfs2_iocb_is_rw_locked(iocb) \
  99         test_bit(0, (unsigned long *)&iocb->private)
 100 static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
 101 {
 102         set_bit(0, (unsigned long *)&iocb->private);
 103         if (level)
 104                 set_bit(1, (unsigned long *)&iocb->private);
 105         else
 106                 clear_bit(1, (unsigned long *)&iocb->private);
 107 }
 108 #define ocfs2_iocb_clear_rw_locked(iocb) \
 109         clear_bit(0, (unsigned long *)&iocb->private)
 110 #define ocfs2_iocb_rw_locked_level(iocb) \
 111         test_bit(1, (unsigned long *)&iocb->private)
 112 #endif /* OCFS2_FILE_H */