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Commit 9abb4083 authored by Fabian Frederick's avatar Fabian Frederick Committed by Linus Torvalds
Browse files

fs/affs/file.c: add support to O_DIRECT 



Based on ext2_direct_IO

Tested with O_DIRECT file open and sysbench/mariadb with 1% written
queries improvement (update_non_index test) on a volume created with
mkaffs.

Signed-off-by: default avatarFabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1ee54b09

fs/affs/file.c

+18 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
 *  affs regular file handling primitives

 */



#include <linux/aio.h>

#include "affs.h"



#if PAGE_SIZE < 4096
@@ -392,6 +393,22 @@ static void affs_write_failed(struct address_space *mapping, loff_t to) 
	}

}



static ssize_t

affs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,

	       loff_t offset)

{

	struct file *file = iocb->ki_filp;

	struct address_space *mapping = file->f_mapping;

	struct inode *inode = mapping->host;

	size_t count = iov_iter_count(iter);

	ssize_t ret;



	ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, affs_get_block);

	if (ret < 0 && (rw & WRITE))

		affs_write_failed(mapping, offset + count);

	return ret;

}



static int affs_write_begin(struct file *file, struct address_space *mapping,

			loff_t pos, unsigned len, unsigned flags,

			struct page **pagep, void **fsdata)
@@ -418,6 +435,7 @@ const struct address_space_operations affs_aops = { 
	.writepage = affs_writepage,

	.write_begin = affs_write_begin,

	.write_end = generic_write_end,

	.direct_IO = affs_direct_IO,

	.bmap = _affs_bmap

};