fs/ocfs2/aops.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * Copyright (C) 2002, 2004, 2005 Oracle.  All rights reserved.
   6  */
   7
   8 #ifndef OCFS2_AOPS_H
   9 #define OCFS2_AOPS_H
  10
  11 #include <linux/fs.h>
  12
  13 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  14                                                          struct page *page,
  15                                                          unsigned from,
  16                                                          unsigned to);
  17
  18 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  19                           struct inode *inode, unsigned int from,
  20                           unsigned int to, int new);
  21
  22 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  23
  24 int walk_page_buffers(  handle_t *handle,
  25                         struct buffer_head *head,
  26                         unsigned from,
  27                         unsigned to,
  28                         int *partial,
  29                         int (*fn)(      handle_t *handle,
  30                                         struct buffer_head *bh));
  31
  32 int ocfs2_write_end_nolock(struct address_space *mapping,
  33                            loff_t pos, unsigned len, unsigned copied, void *fsdata);
  34
  35 typedef enum {
  36         OCFS2_WRITE_BUFFER = 0,
  37         OCFS2_WRITE_DIRECT,
  38         OCFS2_WRITE_MMAP,
  39 } ocfs2_write_type_t;
  40
  41 int ocfs2_write_begin_nolock(struct address_space *mapping,
  42                              loff_t pos, unsigned len, ocfs2_write_type_t type,
  43                              struct page **pagep, void **fsdata,
  44                              struct buffer_head *di_bh, struct page *mmap_page);
  45
  46 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  47                            struct buffer_head *di_bh);
  48 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  49
  50 int ocfs2_get_block(struct inode *inode, sector_t iblock,
  51                     struct buffer_head *bh_result, int create);
  52 /* all ocfs2_dio_end_io()'s fault */
  53 #define ocfs2_iocb_is_rw_locked(iocb) \
  54         test_bit(0, (unsigned long *)&iocb->private)
  55 static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
  56 {
  57         set_bit(0, (unsigned long *)&iocb->private);
  58         if (level)
  59                 set_bit(1, (unsigned long *)&iocb->private);
  60         else
  61                 clear_bit(1, (unsigned long *)&iocb->private);
  62 }
  63
  64 /*
  65  * Using a named enum representing lock types in terms of #N bit stored in
  66  * iocb->private, which is going to be used for communication between
  67  * ocfs2_dio_end_io() and ocfs2_file_write/read_iter().
  68  */
  69 enum ocfs2_iocb_lock_bits {
  70         OCFS2_IOCB_RW_LOCK = 0,
  71         OCFS2_IOCB_RW_LOCK_LEVEL,
  72         OCFS2_IOCB_NUM_LOCKS
  73 };
  74
  75 #define ocfs2_iocb_clear_rw_locked(iocb) \
  76         clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
  77 #define ocfs2_iocb_rw_locked_level(iocb) \
  78         test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
  79
  80 #endif /* OCFS2_FILE_H */