[patch 5/6] splice: remove generic_file_splice_write_nolock()

[Miklos Szeredi]

Remove the now unused generic_file_splice_write_nolock() function.
It's conceptually broken anyway, because splice may need to wait for
pipe events so holding locks across the whole operation is wrong.

Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---
 fs/splice.c        |   59 -----------------------------------------------------
 include/linux/fs.h |    2 -
 2 files changed, 61 deletions(-)

Index: linux-2.6/fs/splice.c
===================================================================
--- linux-2.6.orig/fs/splice.c	2009-04-14 18:36:32.000000000 +0200
+++ linux-2.6/fs/splice.c	2009-04-14 19:01:16.000000000 +0200
@@ -811,65 +811,6 @@ ssize_t splice_from_pipe(struct pipe_ino
 }
 
 /**
- * generic_file_splice_write_nolock - generic_file_splice_write without mutexes
- * @pipe:	pipe info
- * @out:	file to write to
- * @ppos:	position in @out
- * @len:	number of bytes to splice
- * @flags:	splice modifier flags
- *
- * Description:
- *    Will either move or copy pages (determined by @flags options) from
- *    the given pipe inode to the given file. The caller is responsible
- *    for acquiring i_mutex on both inodes.
- *
- */
-ssize_t
-generic_file_splice_write_nolock(struct pipe_inode_info *pipe, struct file *out,
-				 loff_t *ppos, size_t len, unsigned int flags)
-{
-	struct address_space *mapping = out->f_mapping;
-	struct inode *inode = mapping->host;
-	struct splice_desc sd = {
-		.total_len = len,
-		.flags = flags,
-		.pos = *ppos,
-		.u.file = out,
-	};
-	ssize_t ret;
-	int err;
-
-	err = file_remove_suid(out);
-	if (unlikely(err))
-		return err;
-
-	ret = __splice_from_pipe(pipe, &sd, pipe_to_file);
-	if (ret > 0) {
-		unsigned long nr_pages;
-
-		*ppos += ret;
-		nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
-		/*
-		 * If file or inode is SYNC and we actually wrote some data,
-		 * sync it.
-		 */
-		if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
-			err = generic_osync_inode(inode, mapping,
-						  OSYNC_METADATA|OSYNC_DATA);
-
-			if (err)
-				ret = err;
-		}
-		balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
-	}
-
-	return ret;
-}
-
-EXPORT_SYMBOL(generic_file_splice_write_nolock);
-
-/**
  * generic_file_splice_write - splice data from a pipe to a file
  * @pipe:	pipe info
  * @out:	file to write to
Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h	2009-04-14 16:35:15.000000000 +0200
+++ linux-2.6/include/linux/fs.h	2009-04-14 19:01:16.000000000 +0200
@@ -2150,8 +2150,6 @@ extern ssize_t generic_file_splice_read(
 		struct pipe_inode_info *, size_t, unsigned int);
 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
 		struct file *, loff_t *, size_t, unsigned int);
-extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
-		struct file *, loff_t *, size_t, unsigned int);
 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
 		struct file *out, loff_t *, size_t len, unsigned int flags);
 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,

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