Commit 3a326a2c authored by Ingo Molnar's avatar Ingo Molnar Committed by Jens Axboe
Browse files

[PATCH] introduce a "kernel-internal pipe object" abstraction 



separate out the 'internal pipe object' abstraction, and make it
usable to splice. This cleans up and fixes several aspects of the
internal splice APIs and the pipe code:

 - pipes: the allocation and freeing of pipe_inode_info is now more symmetric
   and more streamlined with existing kernel practices.

 - splice: small micro-optimization: less pointer dereferencing in splice
   methods

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>

Update XFS for the ->splice_read/->splice_write changes.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent 0b749ce3

fs/fifo.c

+7 −5
Original line number Diff line number Diff line
@@ -18,8 +18,9 @@ 
static void wait_for_partner(struct inode* inode, unsigned int *cnt)

{

	int cur = *cnt;	



	while (cur == *cnt) {

		pipe_wait(inode);

		pipe_wait(inode->i_pipe);

		if (signal_pending(current))

			break;

	}
@@ -37,7 +38,8 @@ static int fifo_open(struct inode *inode, struct file *filp) 
	mutex_lock(PIPE_MUTEX(*inode));

	if (!inode->i_pipe) {

		ret = -ENOMEM;

		if(!pipe_new(inode))

		inode->i_pipe = alloc_pipe_info(inode);

		if (!inode->i_pipe)

			goto err_nocleanup;

	}

	filp->f_version = 0;

fs/pipe.c

+26 −25
Original line number Diff line number Diff line
@@ -36,7 +36,7 @@ 
 */



/* Drop the inode semaphore and wait for a pipe event, atomically */

void pipe_wait(struct inode * inode)

void pipe_wait(struct pipe_inode_info *pipe)

{

	DEFINE_WAIT(wait);
@@ -44,11 +44,13 @@ void pipe_wait(struct inode * inode) 
	 * Pipes are system-local resources, so sleeping on them

	 * is considered a noninteractive wait:

	 */

	prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE|TASK_NONINTERACTIVE);

	mutex_unlock(PIPE_MUTEX(*inode));

	prepare_to_wait(&pipe->wait, &wait, TASK_INTERRUPTIBLE|TASK_NONINTERACTIVE);

	if (pipe->inode)

		mutex_unlock(&pipe->inode->i_mutex);

	schedule();

	finish_wait(PIPE_WAIT(*inode), &wait);

	mutex_lock(PIPE_MUTEX(*inode));

	finish_wait(&pipe->wait, &wait);

	if (pipe->inode)

		mutex_lock(&pipe->inode->i_mutex);

}



static int
@@ -223,7 +225,7 @@ pipe_readv(struct file *filp, const struct iovec *_iov, 
			wake_up_interruptible_sync(PIPE_WAIT(*inode));

 			kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);

		}

		pipe_wait(inode);

		pipe_wait(inode->i_pipe);

	}

	mutex_unlock(PIPE_MUTEX(*inode));

	/* Signal writers asynchronously that there is more room.  */
@@ -370,7 +372,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov, 
			do_wakeup = 0;

		}

		PIPE_WAITING_WRITERS(*inode)++;

		pipe_wait(inode);

		pipe_wait(inode->i_pipe);

		PIPE_WAITING_WRITERS(*inode)--;

	}

out:
@@ -675,6 +677,20 @@ static struct file_operations rdwr_pipe_fops = { 
	.fasync		= pipe_rdwr_fasync,

};



struct pipe_inode_info * alloc_pipe_info(struct inode *inode)

{

	struct pipe_inode_info *info;



	info = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL);

	if (info) {

		init_waitqueue_head(&info->wait);

		info->r_counter = info->w_counter = 1;

		info->inode = inode;

	}



	return info;

}



void free_pipe_info(struct inode *inode)

{

	int i;
@@ -691,23 +707,6 @@ void free_pipe_info(struct inode *inode) 
	kfree(info);

}



struct inode* pipe_new(struct inode* inode)

{

	struct pipe_inode_info *info;



	info = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL);

	if (!info)

		goto fail_page;

	inode->i_pipe = info;



	init_waitqueue_head(PIPE_WAIT(*inode));

	PIPE_RCOUNTER(*inode) = PIPE_WCOUNTER(*inode) = 1;



	return inode;

fail_page:

	return NULL;

}



static struct vfsmount *pipe_mnt __read_mostly;

static int pipefs_delete_dentry(struct dentry *dentry)

{
@@ -724,8 +723,10 @@ static struct inode * get_pipe_inode(void) 
	if (!inode)

		goto fail_inode;



	if(!pipe_new(inode))

	inode->i_pipe = alloc_pipe_info(inode);

	if (!inode->i_pipe)

		goto fail_iput;



	PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 1;

	inode->i_fop = &rdwr_pipe_fops;

fs/splice.c

+63 −59
Original line number Diff line number Diff line
@@ -136,34 +136,33 @@ static struct pipe_buf_operations page_cache_pipe_buf_ops = { 
 * Pipe output worker. This sets up our pipe format with the page cache

 * pipe buffer operations. Otherwise very similar to the regular pipe_writev().

 */

static ssize_t move_to_pipe(struct inode *inode, struct page **pages,

static ssize_t move_to_pipe(struct pipe_inode_info *pipe, struct page **pages,

			    int nr_pages, unsigned long offset,

			    unsigned long len, unsigned int flags)

{

	struct pipe_inode_info *info;

	int ret, do_wakeup, i;



	ret = 0;

	do_wakeup = 0;

	i = 0;



	mutex_lock(PIPE_MUTEX(*inode));

	if (pipe->inode)

		mutex_lock(&pipe->inode->i_mutex);



	info = inode->i_pipe;

	for (;;) {

		int bufs;



		if (!PIPE_READERS(*inode)) {

		if (!pipe->readers) {

			send_sig(SIGPIPE, current, 0);

			if (!ret)

				ret = -EPIPE;

			break;

		}



		bufs = info->nrbufs;

		bufs = pipe->nrbufs;

		if (bufs < PIPE_BUFFERS) {

			int newbuf = (info->curbuf + bufs) & (PIPE_BUFFERS - 1);

			struct pipe_buffer *buf = info->bufs + newbuf;

			int newbuf = (pipe->curbuf + bufs) & (PIPE_BUFFERS - 1);

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

			struct page *page = pages[i++];

			unsigned long this_len;
@@ -175,7 +174,7 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages, 
			buf->offset = offset;

			buf->len = this_len;

			buf->ops = &page_cache_pipe_buf_ops;

			info->nrbufs = ++bufs;

			pipe->nrbufs = ++bufs;

			do_wakeup = 1;



			ret += this_len;
@@ -205,25 +204,25 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages, 


		if (do_wakeup) {

			smp_mb();

			if (waitqueue_active(PIPE_WAIT(*inode)))

				wake_up_interruptible_sync(PIPE_WAIT(*inode));

			kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO,

				    POLL_IN);

			if (waitqueue_active(&pipe->wait))

				wake_up_interruptible_sync(&pipe->wait);

			kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);

			do_wakeup = 0;

		}



		PIPE_WAITING_WRITERS(*inode)++;

		pipe_wait(inode);

		PIPE_WAITING_WRITERS(*inode)--;

		pipe->waiting_writers++;

		pipe_wait(pipe);

		pipe->waiting_writers--;

	}



	mutex_unlock(PIPE_MUTEX(*inode));

	if (pipe->inode)

		mutex_unlock(&pipe->inode->i_mutex);



	if (do_wakeup) {

		smp_mb();

		if (waitqueue_active(PIPE_WAIT(*inode)))

			wake_up_interruptible(PIPE_WAIT(*inode));

		kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);

		if (waitqueue_active(&pipe->wait))

			wake_up_interruptible(&pipe->wait);

		kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);

	}



	while (i < nr_pages)
@@ -232,7 +231,8 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages, 
	return ret;

}



static int __generic_file_splice_read(struct file *in, struct inode *pipe,

static int

__generic_file_splice_read(struct file *in, struct pipe_inode_info *pipe,

			   size_t len, unsigned int flags)

{

	struct address_space *mapping = in->f_mapping;
@@ -298,7 +298,7 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe, 
 * Will read pages from given file and fill them into a pipe.

 *

 */

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

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

				 size_t len, unsigned int flags)

{

	ssize_t spliced;
@@ -306,6 +306,7 @@ ssize_t generic_file_splice_read(struct file *in, struct inode *pipe, 


	ret = 0;

	spliced = 0;



	while (len) {

		ret = __generic_file_splice_read(in, pipe, len, flags);
@@ -509,11 +510,10 @@ typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, 
 * key here is the 'actor' worker passed in that actually moves the data

 * to the wanted destination. See pipe_to_file/pipe_to_sendpage above.

 */

static ssize_t move_from_pipe(struct inode *inode, struct file *out,

static ssize_t move_from_pipe(struct pipe_inode_info *pipe, struct file *out,

			      size_t len, unsigned int flags,

			      splice_actor *actor)

{

	struct pipe_inode_info *info;

	int ret, do_wakeup, err;

	struct splice_desc sd;
@@ -525,22 +525,22 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 
	sd.file = out;

	sd.pos = out->f_pos;



	mutex_lock(PIPE_MUTEX(*inode));

	if (pipe->inode)

		mutex_lock(&pipe->inode->i_mutex);



	info = inode->i_pipe;

	for (;;) {

		int bufs = info->nrbufs;

		int bufs = pipe->nrbufs;



		if (bufs) {

			int curbuf = info->curbuf;

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

			int curbuf = pipe->curbuf;

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

			struct pipe_buf_operations *ops = buf->ops;



			sd.len = buf->len;

			if (sd.len > sd.total_len)

				sd.len = sd.total_len;



			err = actor(info, buf, &sd);

			err = actor(pipe, buf, &sd);

			if (err) {

				if (!ret && err != -ENODATA)

					ret = err;
@@ -553,10 +553,10 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 
			buf->len -= sd.len;

			if (!buf->len) {

				buf->ops = NULL;

				ops->release(info, buf);

				ops->release(pipe, buf);

				curbuf = (curbuf + 1) & (PIPE_BUFFERS - 1);

				info->curbuf = curbuf;

				info->nrbufs = --bufs;

				pipe->curbuf = curbuf;

				pipe->nrbufs = --bufs;

				do_wakeup = 1;

			}
@@ -568,9 +568,9 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 


		if (bufs)

			continue;

		if (!PIPE_WRITERS(*inode))

		if (!pipe->writers)

			break;

		if (!PIPE_WAITING_WRITERS(*inode)) {

		if (!pipe->waiting_writers) {

			if (ret)

				break;

		}
@@ -589,22 +589,23 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 


		if (do_wakeup) {

			smp_mb();

			if (waitqueue_active(PIPE_WAIT(*inode)))

				wake_up_interruptible_sync(PIPE_WAIT(*inode));

			kill_fasync(PIPE_FASYNC_WRITERS(*inode),SIGIO,POLL_OUT);

			if (waitqueue_active(&pipe->wait))

				wake_up_interruptible_sync(&pipe->wait);

			kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);

			do_wakeup = 0;

		}



		pipe_wait(inode);

		pipe_wait(pipe);

	}



	mutex_unlock(PIPE_MUTEX(*inode));

	if (pipe->inode)

		mutex_unlock(&pipe->inode->i_mutex);



	if (do_wakeup) {

		smp_mb();

		if (waitqueue_active(PIPE_WAIT(*inode)))

			wake_up_interruptible(PIPE_WAIT(*inode));

		kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);

		if (waitqueue_active(&pipe->wait))

			wake_up_interruptible(&pipe->wait);

		kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);

	}



	mutex_lock(&out->f_mapping->host->i_mutex);
@@ -616,7 +617,7 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 


/**

 * generic_file_splice_write - splice data from a pipe to a file

 * @inode:	pipe inode

 * @pipe:	pipe info

 * @out:	file to write to

 * @len:	number of bytes to splice

 * @flags:	splice modifier flags
@@ -625,11 +626,14 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, 
 * the given pipe inode to the given file.

 *

 */

ssize_t generic_file_splice_write(struct inode *inode, struct file *out,

ssize_t

generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,

			  size_t len, unsigned int flags)

{

	struct address_space *mapping = out->f_mapping;

	ssize_t ret = move_from_pipe(inode, out, len, flags, pipe_to_file);

	ssize_t ret;



	ret = move_from_pipe(pipe, out, len, flags, pipe_to_file);



	/*

	 * if file or inode is SYNC and we actually wrote some data, sync it
@@ -664,10 +668,10 @@ EXPORT_SYMBOL(generic_file_splice_write); 
 * is involved.

 *

 */

ssize_t generic_splice_sendpage(struct inode *inode, struct file *out,

ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, struct file *out,

				size_t len, unsigned int flags)

{

	return move_from_pipe(inode, out, len, flags, pipe_to_sendpage);

	return move_from_pipe(pipe, out, len, flags, pipe_to_sendpage);

}



EXPORT_SYMBOL(generic_splice_sendpage);
@@ -675,8 +679,8 @@ EXPORT_SYMBOL(generic_splice_sendpage); 
/*

 * Attempt to initiate a splice from pipe to file.

 */

static long do_splice_from(struct inode *pipe, struct file *out, size_t len,

			   unsigned int flags)

static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,

			   size_t len, unsigned int flags)

{

	loff_t pos;

	int ret;
@@ -698,8 +702,8 @@ static long do_splice_from(struct inode *pipe, struct file *out, size_t len, 
/*

 * Attempt to initiate a splice from a file to a pipe.

 */

static long do_splice_to(struct file *in, struct inode *pipe, size_t len,

			 unsigned int flags)

static long do_splice_to(struct file *in, struct pipe_inode_info *pipe,

			 size_t len, unsigned int flags)

{

	loff_t pos, isize, left;

	int ret;
@@ -732,14 +736,14 @@ static long do_splice_to(struct file *in, struct inode *pipe, size_t len, 
static long do_splice(struct file *in, struct file *out, size_t len,

		      unsigned int flags)

{

	struct inode *pipe;

	struct pipe_inode_info *pipe;



	pipe = in->f_dentry->d_inode;

	if (pipe->i_pipe)

	pipe = in->f_dentry->d_inode->i_pipe;

	if (pipe)

		return do_splice_from(pipe, out, len, flags);



	pipe = out->f_dentry->d_inode;

	if (pipe->i_pipe)

	pipe = out->f_dentry->d_inode->i_pipe;

	if (pipe)

		return do_splice_to(in, pipe, len, flags);



	return -EINVAL;

fs/xfs/linux-2.6/xfs_file.c

+4 −4
Original line number Diff line number Diff line
@@ -252,7 +252,7 @@ xfs_file_sendfile_invis( 
STATIC ssize_t

xfs_file_splice_read(

	struct file		*infilp,

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	size_t			len,

	unsigned int		flags)

{
@@ -266,7 +266,7 @@ xfs_file_splice_read( 
STATIC ssize_t

xfs_file_splice_read_invis(

	struct file		*infilp,

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	size_t			len,

	unsigned int		flags)

{
@@ -279,7 +279,7 @@ xfs_file_splice_read_invis( 


STATIC ssize_t

xfs_file_splice_write(

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	struct file		*outfilp,

	size_t			len,

	unsigned int		flags)
@@ -293,7 +293,7 @@ xfs_file_splice_write( 


STATIC ssize_t

xfs_file_splice_write_invis(

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	struct file		*outfilp,

	size_t			len,

	unsigned int		flags)

fs/xfs/linux-2.6/xfs_lrw.c

+2 −2
Original line number Diff line number Diff line
@@ -338,7 +338,7 @@ ssize_t 
xfs_splice_read(

	bhv_desc_t		*bdp,

	struct file		*infilp,

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	size_t			count,

	int			flags,

	int			ioflags,
@@ -380,7 +380,7 @@ xfs_splice_read( 
ssize_t

xfs_splice_write(

	bhv_desc_t		*bdp,

	struct inode		*pipe,

	struct pipe_inode_info	*pipe,

	struct file		*outfilp,

	size_t			count,

	int			flags,