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Commit ae191838 authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: optimize rec_len functions 



This is a similar change to those in ext2/ext3 codebase (commit
40a063f6 and a4ae3094, respectively).

The addition of 64k block capability in the rec_len_from_disk and
rec_len_to_disk functions added a bit of math overhead which slows
down file create workloads needlessly when the architecture cannot
even support 64k blocks.  This will cut the corner.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 4138ec23

fs/nilfs2/ioctl.c

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/vmalloc.h>

#include <linux/compat.h>	/* compat_ptr() */

#include <linux/mount.h>	/* mnt_want_write(), mnt_drop_write() */

#include <linux/buffer_head.h>

#include <linux/nilfs2_fs.h>

#include "nilfs.h"

#include "segment.h"

include/linux/nilfs2_fs.h

+4 −0
Original line number Diff line number Diff line
@@ -326,17 +326,21 @@ static inline unsigned nilfs_rec_len_from_disk(__le16 dlen) 
{

	unsigned len = le16_to_cpu(dlen);



#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)

	if (len == NILFS_MAX_REC_LEN)

		return 1 << 16;

#endif

	return len;

}



static inline __le16 nilfs_rec_len_to_disk(unsigned len)

{

#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)

	if (len == (1 << 16))

		return cpu_to_le16(NILFS_MAX_REC_LEN);

	else if (len > (1 << 16))

		BUG();

#endif

	return cpu_to_le16(len);

}