From 32c0a6bcaa1f57e80f67bf3ae2b35d00cea8361a Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Sun, 21 Mar 2021 21:03:11 +0000 Subject: btrfs: add and use readahead_batch_length Implement readahead_batch_length() to determine the number of bytes in the current batch of readahead pages and use it in btrfs. Also use the readahead_pos to get the offset. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: David Sterba Signed-off-by: David Sterba --- include/linux/pagemap.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/linux') diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 8c9947fd62f3..4c1ffe1d5dac 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -981,6 +981,15 @@ static inline unsigned int readahead_count(struct readahead_control *rac) return rac->_nr_pages; } +/** + * readahead_batch_length - The number of bytes in the current batch. + * @rac: The readahead request. + */ +static inline loff_t readahead_batch_length(struct readahead_control *rac) +{ + return rac->_batch_count * PAGE_SIZE; +} + static inline unsigned long dir_pages(struct inode *inode) { return (unsigned long)(inode->i_size + PAGE_SIZE - 1) >> -- cgit v1.2.3