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 struct ocfs2_write_ctxt;
  34 typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
  35                                 u64 *, unsigned int *, unsigned int *);
  36
  37 ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
  38                                      size_t count, ocfs2_page_writer *actor,
  39                                      void *priv);
  40
  41 struct ocfs2_write_ctxt {
  42         size_t                          w_count;
  43         loff_t                          w_pos;
  44         u32                             w_cpos;
  45         unsigned int                    w_finished_copy;
  46
  47         /* This is true if page_size > cluster_size */
  48         unsigned int                    w_large_pages;
  49
  50         /* Filler callback and private data */
  51         ocfs2_page_writer               *w_write_data_page;
  52         void                            *w_private;
  53
  54         /* Only valid for the filler callback */
  55         struct page                     *w_this_page;
  56         unsigned int                    w_this_page_new;
  57 };
  58
  59 struct ocfs2_buffered_write_priv {
  60         char                            *b_src_buf;
  61         const struct iovec              *b_cur_iov; /* Current iovec */
  62         size_t                          b_cur_off; /* Offset in the
  63                                                     * current iovec */
  64 };
  65 int ocfs2_map_and_write_user_data(struct inode *inode,
  66                                   struct ocfs2_write_ctxt *wc,
  67                                   u64 *p_blkno,
  68                                   unsigned int *ret_from,
  69                                   unsigned int *ret_to);
  70
  71 /* all ocfs2_dio_end_io()'s fault */
  72 #define ocfs2_iocb_is_rw_locked(iocb) \
  73         test_bit(0, (unsigned long *)&iocb->private)
  74 #define ocfs2_iocb_set_rw_locked(iocb) \
  75         set_bit(0, (unsigned long *)&iocb->private)
  76 #define ocfs2_iocb_clear_rw_locked(iocb) \
  77         clear_bit(0, (unsigned long *)&iocb->private)
  78
  79 #endif /* OCFS2_FILE_H */