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Commit a779638c authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Al Viro
Browse files

pipe: add pipe_buf_release() helper 



Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7bf2d1df

fs/fuse/dev.c

+3 −4
Original line number Diff line number Diff line
@@ -1985,10 +1985,9 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, 


	ret = fuse_dev_do_write(fud, &cs, len);



	for (idx = 0; idx < nbuf; idx++) {

		struct pipe_buffer *buf = &bufs[idx];

		buf->ops->release(pipe, buf);

	}

	for (idx = 0; idx < nbuf; idx++)

		pipe_buf_release(pipe, &bufs[idx]);



out:

	kfree(bufs);

	return ret;

fs/pipe.c

+2 −3
Original line number Diff line number Diff line
@@ -299,8 +299,7 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to) 
			}



			if (!buf->len) {

				buf->ops = NULL;

				ops->release(pipe, buf);

				pipe_buf_release(pipe, buf);

				curbuf = (curbuf + 1) & (pipe->buffers - 1);

				pipe->curbuf = curbuf;

				pipe->nrbufs = --bufs;
@@ -664,7 +663,7 @@ void free_pipe_info(struct pipe_inode_info *pipe) 
	for (i = 0; i < pipe->buffers; i++) {

		struct pipe_buffer *buf = pipe->bufs + i;

		if (buf->ops)

			buf->ops->release(pipe, buf);

			pipe_buf_release(pipe, buf);

	}

	if (pipe->tmp_page)

		__free_page(pipe->tmp_page);

fs/splice.c

+5 −12
Original line number Diff line number Diff line
@@ -238,8 +238,7 @@ ssize_t add_to_pipe(struct pipe_inode_info *pipe, struct pipe_buffer *buf) 
		pipe->nrbufs++;

		return buf->len;

	}

	buf->ops->release(pipe, buf);

	buf->ops = NULL;

	pipe_buf_release(pipe, buf);

	return ret;

}

EXPORT_SYMBOL(add_to_pipe);
@@ -516,7 +515,6 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des 


	while (pipe->nrbufs) {

		struct pipe_buffer *buf = pipe->bufs + pipe->curbuf;

		const struct pipe_buf_operations *ops = buf->ops;



		sd->len = buf->len;

		if (sd->len > sd->total_len)
@@ -542,8 +540,7 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des 
		sd->total_len -= ret;



		if (!buf->len) {

			buf->ops = NULL;

			ops->release(pipe, buf);

			pipe_buf_release(pipe, buf);

			pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);

			pipe->nrbufs--;

			if (pipe->files)
@@ -789,11 +786,9 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, 
		while (ret) {

			struct pipe_buffer *buf = pipe->bufs + pipe->curbuf;

			if (ret >= buf->len) {

				const struct pipe_buf_operations *ops = buf->ops;

				ret -= buf->len;

				buf->len = 0;

				buf->ops = NULL;

				ops->release(pipe, buf);

				pipe_buf_release(pipe, buf);

				pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);

				pipe->nrbufs--;

				if (pipe->files)
@@ -1032,10 +1027,8 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd, 
	for (i = 0; i < pipe->buffers; i++) {

		struct pipe_buffer *buf = pipe->bufs + i;



		if (buf->ops) {

			buf->ops->release(pipe, buf);

			buf->ops = NULL;

		}

		if (buf->ops)

			pipe_buf_release(pipe, buf);

	}



	if (!bytes)

include/linux/pipe_fs_i.h

+14 −0
Original line number Diff line number Diff line
@@ -126,6 +126,20 @@ static inline void pipe_buf_get(struct pipe_inode_info *pipe, 
	buf->ops->get(pipe, buf);

}



/**

 * pipe_buf_release - put a reference to a pipe_buffer

 * @pipe:	the pipe that the buffer belongs to

 * @buf:	the buffer to put a reference to

 */

static inline void pipe_buf_release(struct pipe_inode_info *pipe,

				    struct pipe_buffer *buf)

{

	const struct pipe_buf_operations *ops = buf->ops;



	buf->ops = NULL;

	ops->release(pipe, buf);

}



/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual

   memory allocation, whereas PIPE_BUF makes atomicity guarantees.  */

#define PIPE_SIZE		PAGE_SIZE

lib/iov_iter.c

+1 −3
Original line number Diff line number Diff line
@@ -709,9 +709,7 @@ static void pipe_advance(struct iov_iter *i, size_t size) 
		int unused = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1);

		/* [curbuf,unused) is in use.  Free [idx,unused) */

		while (idx != unused) {

			buf = &pipe->bufs[idx];

			buf->ops->release(pipe, buf);

			buf->ops = NULL;

			pipe_buf_release(pipe, &pipe->bufs[idx]);

			idx = next_idx(idx, pipe);

			pipe->nrbufs--;

		}