fs/ocfs2/aops.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright (C) 2002, 2004, 2005 Oracle.  All rights reserved.
0004  */
0005
0006 #ifndef OCFS2_AOPS_H
0007 #define OCFS2_AOPS_H
0008
0009 #include <linux/fs.h>
0010
0011 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
0012                              struct page *page,
0013                              unsigned from,
0014                              unsigned to);
0015
0016 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
0017               struct inode *inode, unsigned int from,
0018               unsigned int to, int new);
0019
0020 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
0021
0022 int walk_page_buffers(  handle_t *handle,
0023             struct buffer_head *head,
0024             unsigned from,
0025             unsigned to,
0026             int *partial,
0027             int (*fn)(  handle_t *handle,
0028                     struct buffer_head *bh));
0029
0030 int ocfs2_write_end_nolock(struct address_space *mapping,
0031                loff_t pos, unsigned len, unsigned copied, void *fsdata);
0032
0033 typedef enum {
0034     OCFS2_WRITE_BUFFER = 0,
0035     OCFS2_WRITE_DIRECT,
0036     OCFS2_WRITE_MMAP,
0037 } ocfs2_write_type_t;
0038
0039 int ocfs2_write_begin_nolock(struct address_space *mapping,
0040                  loff_t pos, unsigned len, ocfs2_write_type_t type,
0041                  struct page **pagep, void **fsdata,
0042                  struct buffer_head *di_bh, struct page *mmap_page);
0043
0044 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
0045                struct buffer_head *di_bh);
0046 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
0047
0048 int ocfs2_get_block(struct inode *inode, sector_t iblock,
0049             struct buffer_head *bh_result, int create);
0050 /* all ocfs2_dio_end_io()'s fault */
0051 #define ocfs2_iocb_is_rw_locked(iocb) \
0052     test_bit(0, (unsigned long *)&iocb->private)
0053 static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
0054 {
0055     set_bit(0, (unsigned long *)&iocb->private);
0056     if (level)
0057         set_bit(1, (unsigned long *)&iocb->private);
0058     else
0059         clear_bit(1, (unsigned long *)&iocb->private);
0060 }
0061
0062 /*
0063  * Using a named enum representing lock types in terms of #N bit stored in
0064  * iocb->private, which is going to be used for communication between
0065  * ocfs2_dio_end_io() and ocfs2_file_write/read_iter().
0066  */
0067 enum ocfs2_iocb_lock_bits {
0068     OCFS2_IOCB_RW_LOCK = 0,
0069     OCFS2_IOCB_RW_LOCK_LEVEL,
0070     OCFS2_IOCB_NUM_LOCKS
0071 };
0072
0073 #define ocfs2_iocb_clear_rw_locked(iocb) \
0074     clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
0075 #define ocfs2_iocb_rw_locked_level(iocb) \
0076     test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
0077
0078 #endif /* OCFS2_FILE_H */