LXR linux/fs/ocfs2/aops.h

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