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Commit 01370f06 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'splice-2.6.23' of git://git.kernel.dk/data/git/linux-2.6-block 

* 'splice-2.6.23' of git://git.kernel.dk/data/git/linux-2.6-block:
  pipe: add documentation and comments
  pipe: change the ->pin() operation to ->confirm()
  Remove remnants of sendfile()
  xip sendfile removal
  splice: completely document external interface with kerneldoc
  sendfile: remove bad_sendfile() from bad_file_ops
  shmem: convert to using splice instead of sendfile()
  relay: use splice_to_pipe() instead of open-coding the pipe loop
  pipe: allow passing around of ops private pointer
  splice: divorce the splice structure/function definitions from the pipe header
  splice: relay support
  sendfile: convert nfsd to splice_direct_to_actor()
  sendfile: convert nfs to using splice_read()
  loop: convert to using splice_direct_to_actor() instead of sendfile()
  splice: add void cookie to the actor data
  sendfile: kill generic_file_sendfile()
  sendfile: remove .sendfile from filesystems that use generic_file_sendfile()
  sys_sendfile: switch to using ->splice_read, if available
  vmsplice: add vmsplice-to-user support
  splice: abstract out actor data
parents 5cbc39a7 0845718d

Documentation/DocBook/kernel-api.tmpl

+11 −0
Original line number Diff line number Diff line
@@ -643,4 +643,15 @@ X!Idrivers/video/console/fonts.c 
!Edrivers/spi/spi.c

  </chapter>



  <chapter id="splice">

      <title>splice API</title>

  <para>)

	splice is a method for moving blocks of data around inside the

	kernel, without continually transferring it between the kernel

	and user space.

  </para>

!Iinclude/linux/splice.h

!Ffs/splice.c

  </chapter>



</book>

drivers/block/loop.c

+44 −20
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ 
#include <linux/highmem.h>

#include <linux/gfp.h>

#include <linux/kthread.h>

#include <linux/splice.h>



#include <asm/uaccess.h>
@@ -401,50 +402,73 @@ struct lo_read_data { 
};



static int

lo_read_actor(read_descriptor_t *desc, struct page *page,

	      unsigned long offset, unsigned long size)

lo_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,

		struct splice_desc *sd)

{

	unsigned long count = desc->count;

	struct lo_read_data *p = desc->arg.data;

	struct lo_read_data *p = sd->u.data;

	struct loop_device *lo = p->lo;

	struct page *page = buf->page;

	sector_t IV;

	size_t size;

	int ret;



	IV = ((sector_t) page->index << (PAGE_CACHE_SHIFT - 9))+(offset >> 9);

	ret = buf->ops->confirm(pipe, buf);

	if (unlikely(ret))

		return ret;



	if (size > count)

		size = count;

	IV = ((sector_t) page->index << (PAGE_CACHE_SHIFT - 9)) +

							(buf->offset >> 9);

	size = sd->len;

	if (size > p->bsize)

		size = p->bsize;



	if (lo_do_transfer(lo, READ, page, offset, p->page, p->offset, size, IV)) {

		size = 0;

	if (lo_do_transfer(lo, READ, page, buf->offset, p->page, p->offset, size, IV)) {

		printk(KERN_ERR "loop: transfer error block %ld\n",

		       page->index);

		desc->error = -EINVAL;

		size = -EINVAL;

	}



	flush_dcache_page(p->page);



	desc->count = count - size;

	desc->written += size;

	if (size > 0)

		p->offset += size;



	return size;

}



static int

lo_direct_splice_actor(struct pipe_inode_info *pipe, struct splice_desc *sd)

{

	return __splice_from_pipe(pipe, sd, lo_splice_actor);

}



static int

do_lo_receive(struct loop_device *lo,

	      struct bio_vec *bvec, int bsize, loff_t pos)

{

	struct lo_read_data cookie;

	struct splice_desc sd;

	struct file *file;

	int retval;

	long retval;



	cookie.lo = lo;

	cookie.page = bvec->bv_page;

	cookie.offset = bvec->bv_offset;

	cookie.bsize = bsize;



	sd.len = 0;

	sd.total_len = bvec->bv_len;

	sd.flags = 0;

	sd.pos = pos;

	sd.u.data = &cookie;



	file = lo->lo_backing_file;

	retval = file->f_op->sendfile(file, &pos, bvec->bv_len,

			lo_read_actor, &cookie);

	return (retval < 0)? retval: 0;

	retval = splice_direct_to_actor(file, &sd, lo_direct_splice_actor);



	if (retval < 0)

		return retval;



	return 0;

}



static int
@@ -679,8 +703,8 @@ static int loop_change_fd(struct loop_device *lo, struct file *lo_file, 
	if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))

		goto out_putf;



	/* new backing store needs to support loop (eg sendfile) */

	if (!inode->i_fop->sendfile)

	/* new backing store needs to support loop (eg splice_read) */

	if (!inode->i_fop->splice_read)

		goto out_putf;



	/* size of the new backing store needs to be the same */
@@ -760,7 +784,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file, 
		 * If we can't read - sorry. If we only can't write - well,

		 * it's going to be read-only.

		 */

		if (!file->f_op->sendfile)

		if (!file->f_op->splice_read)

			goto out_putf;

		if (aops->prepare_write && aops->commit_write)

			lo_flags |= LO_FLAGS_USE_AOPS;

drivers/char/mem.c

+1 −1
Original line number Diff line number Diff line
@@ -24,7 +24,7 @@ 
#include <linux/crash_dump.h>

#include <linux/backing-dev.h>

#include <linux/bootmem.h>

#include <linux/pipe_fs_i.h>

#include <linux/splice.h>

#include <linux/pfn.h>



#include <asm/uaccess.h>

fs/adfs/file.c

+1 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ const struct file_operations adfs_file_operations = { 
	.fsync		= file_fsync,

	.write		= do_sync_write,

	.aio_write	= generic_file_aio_write,

	.sendfile	= generic_file_sendfile,

	.splice_read	= generic_file_splice_read,

};



const struct inode_operations adfs_file_inode_operations = {

fs/affs/file.c

+1 −1
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ const struct file_operations affs_file_operations = { 
	.open		= affs_file_open,

	.release	= affs_file_release,

	.fsync		= file_fsync,

	.sendfile	= generic_file_sendfile,

	.splice_read	= generic_file_splice_read,

};



const struct inode_operations affs_file_inode_operations = {