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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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11
fs/ext4/inode.c
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@@ -1578,11 +1578,9 @@ retry:
*pagep = page;
if (ext4_should_dioread_nolock(inode))
ret = block_write_begin(file, mapping, pos, len, flags, pagep,
fsdata, ext4_get_block_write);
ret = __block_write_begin(page, pos, len, ext4_get_block_write);
else
ret = block_write_begin(file, mapping, pos, len, flags, pagep,
fsdata, ext4_get_block);
ret = __block_write_begin(page, pos, len, ext4_get_block);
if (!ret && ext4_should_journal_data(inode)) {
ret = walk_page_buffers(handle, page_buffers(page),
@@ -1593,7 +1591,7 @@ retry:
unlock_page(page);
page_cache_release(page);
/*
* block_write_begin may have instantiated a few blocks
* __block_write_begin may have instantiated a few blocks
* outside i_size. Trim these off again. Don't need
* i_size_read because we hold i_mutex.
*
@@ -3185,8 +3183,7 @@ retry:
}
*pagep = page;
ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
ext4_da_get_block_prep);
ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep);
if (ret < 0) {
unlock_page(page);
ext4_journal_stop(handle);