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
  11 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
  12                                                          struct page *page,
  13                                                          unsigned from,
  14                                                          unsigned to);
  15
  16 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
  17                           struct inode *inode, unsigned int from,
  18                           unsigned int to, int new);
  19
  20 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
  21
  22 int 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
  30 int ocfs2_write_end_nolock(struct address_space *mapping,
  31                            loff_t pos, unsigned len, unsigned copied, void *fsdata);
  32
  33 typedef enum {
  34         OCFS2_WRITE_BUFFER = 0,
  35         OCFS2_WRITE_DIRECT,
  36         OCFS2_WRITE_MMAP,
  37 } ocfs2_write_type_t;
  38
  39 int 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
  44 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
  45                            struct buffer_head *di_bh);
  46 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
  47
  48 int 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)
  53 static 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  */
  67 enum 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 */