linux/fs/ocfs2/aops.h
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   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#include <linux/aio.h>
  26
  27handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  28                                                         struct page *page,
  29                                                         unsigned from,
  30                                                         unsigned to);
  31
  32int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  33                          struct inode *inode, unsigned int from,
  34                          unsigned int to, int new);
  35
  36void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  37
  38int walk_page_buffers(  handle_t *handle,
  39                        struct buffer_head *head,
  40                        unsigned from,
  41                        unsigned to,
  42                        int *partial,
  43                        int (*fn)(      handle_t *handle,
  44                                        struct buffer_head *bh));
  45
  46int ocfs2_write_end_nolock(struct address_space *mapping,
  47                           loff_t pos, unsigned len, unsigned copied,
  48                           struct page *page, void *fsdata);
  49
  50int ocfs2_write_begin_nolock(struct file *filp,
  51                             struct address_space *mapping,
  52                             loff_t pos, unsigned len, unsigned flags,
  53                             struct page **pagep, void **fsdata,
  54                             struct buffer_head *di_bh, struct page *mmap_page);
  55
  56int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  57                           struct buffer_head *di_bh);
  58int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  59
  60int ocfs2_get_block(struct inode *inode, sector_t iblock,
  61                    struct buffer_head *bh_result, int create);
  62/* all ocfs2_dio_end_io()'s fault */
  63#define ocfs2_iocb_is_rw_locked(iocb) \
  64        test_bit(0, (unsigned long *)&iocb->private)
  65static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
  66{
  67        set_bit(0, (unsigned long *)&iocb->private);
  68        if (level)
  69                set_bit(1, (unsigned long *)&iocb->private);
  70        else
  71                clear_bit(1, (unsigned long *)&iocb->private);
  72}
  73
  74/*
  75 * Using a named enum representing lock types in terms of #N bit stored in
  76 * iocb->private, which is going to be used for communication between
  77 * ocfs2_dio_end_io() and ocfs2_file_aio_write/read().
  78 */
  79enum ocfs2_iocb_lock_bits {
  80        OCFS2_IOCB_RW_LOCK = 0,
  81        OCFS2_IOCB_RW_LOCK_LEVEL,
  82        OCFS2_IOCB_SEM,
  83        OCFS2_IOCB_UNALIGNED_IO,
  84        OCFS2_IOCB_NUM_LOCKS
  85};
  86
  87#define ocfs2_iocb_clear_rw_locked(iocb) \
  88        clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
  89#define ocfs2_iocb_rw_locked_level(iocb) \
  90        test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
  91#define ocfs2_iocb_set_sem_locked(iocb) \
  92        set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  93#define ocfs2_iocb_clear_sem_locked(iocb) \
  94        clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  95#define ocfs2_iocb_is_sem_locked(iocb) \
  96        test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  97
  98#define ocfs2_iocb_set_unaligned_aio(iocb) \
  99        set_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
 100#define ocfs2_iocb_clear_unaligned_aio(iocb) \
 101        clear_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
 102#define ocfs2_iocb_is_unaligned_aio(iocb) \
 103        test_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
 104
 105#define OCFS2_IOEND_WQ_HASH_SZ  37
 106#define ocfs2_ioend_wq(v)   (&ocfs2__ioend_wq[((unsigned long)(v)) %\
 107                                            OCFS2_IOEND_WQ_HASH_SZ])
 108extern wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
 109
 110#endif /* OCFS2_FILE_H */
 111
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