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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: Fabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
wifi-calibration
Fabian Frederick 2014-12-12 16:57:52 -08:00 committed by Linus Torvalds
parent 1ee54b099a
commit 9abb408307
1 changed files with 18 additions and 0 deletions
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18
fs/affs/file.c
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@ -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
};