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 #include <linux/aio.h>
  26
  27 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  28                                                          struct page *page,
  29                                                          unsigned from,
  30                                                          unsigned to);
  31
  32 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  33                           struct inode *inode, unsigned int from,
  34                           unsigned int to, int new);
  35
  36 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  37
  38 int 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
  46 int ocfs2_write_end_nolock(struct address_space *mapping,
  47                            loff_t pos, unsigned len, unsigned copied,
  48                            struct page *page, void *fsdata);
  49
  50 int 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
  56 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  57                            struct buffer_head *di_bh);
  58 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  59
  60 int 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)
  65 static 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  */
  79 enum 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])
 108 extern wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
 109
 110 #endif /* OCFS2_FILE_H */