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
  25handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  26                                                         struct page *page,
  27                                                         unsigned from,
  28                                                         unsigned to);
  29
  30int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  31                          struct inode *inode, unsigned int from,
  32                          unsigned int to, int new);
  33
  34void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  35
  36int walk_page_buffers(  handle_t *handle,
  37                        struct buffer_head *head,
  38                        unsigned from,
  39                        unsigned to,
  40                        int *partial,
  41                        int (*fn)(      handle_t *handle,
  42                                        struct buffer_head *bh));
  43
  44int ocfs2_write_end_nolock(struct address_space *mapping,
  45                           loff_t pos, unsigned len, unsigned copied,
  46                           struct page *page, void *fsdata);
  47
  48int ocfs2_write_begin_nolock(struct file *filp,
  49                             struct address_space *mapping,
  50                             loff_t pos, unsigned len, unsigned flags,
  51                             struct page **pagep, void **fsdata,
  52                             struct buffer_head *di_bh, struct page *mmap_page);
  53
  54int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  55                           struct buffer_head *di_bh);
  56int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  57
  58int ocfs2_get_block(struct inode *inode, sector_t iblock,
  59                    struct buffer_head *bh_result, int create);
  60/* all ocfs2_dio_end_io()'s fault */
  61#define ocfs2_iocb_is_rw_locked(iocb) \
  62        test_bit(0, (unsigned long *)&iocb->private)
  63static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
  64{
  65        set_bit(0, (unsigned long *)&iocb->private);
  66        if (level)
  67                set_bit(1, (unsigned long *)&iocb->private);
  68        else
  69                clear_bit(1, (unsigned long *)&iocb->private);
  70}
  71
  72/*
  73 * Using a named enum representing lock types in terms of #N bit stored in
  74 * iocb->private, which is going to be used for communication between
  75 * ocfs2_dio_end_io() and ocfs2_file_aio_write/read().
  76 */
  77enum ocfs2_iocb_lock_bits {
  78        OCFS2_IOCB_RW_LOCK = 0,
  79        OCFS2_IOCB_RW_LOCK_LEVEL,
  80        OCFS2_IOCB_SEM,
  81        OCFS2_IOCB_UNALIGNED_IO,
  82        OCFS2_IOCB_NUM_LOCKS
  83};
  84
  85#define ocfs2_iocb_clear_rw_locked(iocb) \
  86        clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
  87#define ocfs2_iocb_rw_locked_level(iocb) \
  88        test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
  89#define ocfs2_iocb_set_sem_locked(iocb) \
  90        set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  91#define ocfs2_iocb_clear_sem_locked(iocb) \
  92        clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  93#define ocfs2_iocb_is_sem_locked(iocb) \
  94        test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
  95
  96#define ocfs2_iocb_set_unaligned_aio(iocb) \
  97        set_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
  98#define ocfs2_iocb_clear_unaligned_aio(iocb) \
  99        clear_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
 100#define ocfs2_iocb_is_unaligned_aio(iocb) \
 101        test_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
 102
 103#define OCFS2_IOEND_WQ_HASH_SZ  37
 104#define ocfs2_ioend_wq(v)   (&ocfs2__ioend_wq[((unsigned long)(v)) %\
 105                                            OCFS2_IOEND_WQ_HASH_SZ])
 106extern wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
 107
 108#endif /* OCFS2_FILE_H */
 109
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