LXR linux/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
  13handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  14                                                         struct page *page,
  15                                                         unsigned from,
  16                                                         unsigned to);
  17
  18int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  19                          struct inode *inode, unsigned int from,
  20                          unsigned int to, int new);
  21
  22void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  23
  24int 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
  32int ocfs2_write_end_nolock(struct address_space *mapping,
  33                           loff_t pos, unsigned len, unsigned copied, void *fsdata);
  34
  35typedef enum {
  36        OCFS2_WRITE_BUFFER = 0,
  37        OCFS2_WRITE_DIRECT,
  38        OCFS2_WRITE_MMAP,
  39} ocfs2_write_type_t;
  40
  41int 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
  46int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  47                           struct buffer_head *di_bh);
  48int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  49
  50int 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)
  55static 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 */
  69enum 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 */
  81