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introduce __block_write_begin

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Split up the block_write_begin implementation - __block_write_begin is a new
trivial wrapper for block_prepare_write that always takes an already
allocated page and can be either called from block_write_begin or filesystem
code that already has a page allocated.  Remove the handling of already
allocated pages from block_write_begin after switching all callers that
do it to __block_write_begin.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2010-06-04 11:29:57 +02:00
committed by Al Viro
parent f4e420dc42
commit 6e1db88d53
10 changed files with 39 additions and 64 deletions
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include/linux/buffer_head.h
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@@ -209,6 +209,8 @@ int block_write_begin_newtrunc(struct file *, struct address_space *,
int block_write_begin(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int __block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block);
int block_write_end(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page *, void *);