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Commit 49570e9b authored by Jens Axboe's avatar Jens Axboe
Browse files

[PATCH] splice: unlikely() optimizations 



Also corrects a few comments. Patch mainly from Ingo, changes by me.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent 6f767b04

fs/read_write.c

+1 −1
Original line number Diff line number Diff line
@@ -202,7 +202,7 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count 
		goto Einval;



	inode = file->f_dentry->d_inode;

	if (inode->i_flock && MANDATORY_LOCK(inode)) {

	if (unlikely(inode->i_flock && MANDATORY_LOCK(inode))) {

		int retval = locks_mandatory_area(

			read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,

			inode, file, pos, count);

fs/splice.c

+7 −8
Original line number Diff line number Diff line
@@ -346,7 +346,6 @@ fill_it: 
 * @flags:	splice modifier flags

 *

 * Will read pages from given file and fill them into a pipe.

 *

 */

ssize_t generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,

				 size_t len, unsigned int flags)
@@ -730,10 +729,10 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, 
	loff_t pos;

	int ret;



	if (!out->f_op || !out->f_op->splice_write)

	if (unlikely(!out->f_op || !out->f_op->splice_write))

		return -EINVAL;



	if (!(out->f_mode & FMODE_WRITE))

	if (unlikely(!(out->f_mode & FMODE_WRITE)))

		return -EBADF;



	pos = out->f_pos;
@@ -754,10 +753,10 @@ static long do_splice_to(struct file *in, struct pipe_inode_info *pipe, 
	loff_t pos, isize, left;

	int ret;



	if (!in->f_op || !in->f_op->splice_read)

	if (unlikely(!in->f_op || !in->f_op->splice_read))

		return -EINVAL;



	if (!(in->f_mode & FMODE_READ))

	if (unlikely(!(in->f_mode & FMODE_READ)))

		return -EBADF;



	pos = in->f_pos;
@@ -771,7 +770,7 @@ static long do_splice_to(struct file *in, struct pipe_inode_info *pipe, 
		return 0;

	

	left = isize - in->f_pos;

	if (left < len)

	if (unlikely(left < len))

		len = left;



	return in->f_op->splice_read(in, pipe, len, flags);
@@ -799,7 +798,7 @@ long do_splice_direct(struct file *in, struct file *out, size_t len, 
	 * 'out' and transfer the wanted data from 'in' to 'out' through that

	 */

	pipe = current->splice_pipe;

	if (!pipe) {

	if (unlikely(!pipe)) {

		pipe = alloc_pipe_info(NULL);

		if (!pipe)

			return -ENOMEM;