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ext3: Try to avoid starting a transaction in writepage for data=writepage 

This does the same as commit 9e80d40773
(avoid starting a transaction when no block allocation is needed)
but for data=writeback mode of ext3. We also cleanup the data=ordered
case a bit to stick to coding style...

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara 2009-04-07 18:25:01 -04:00 committed by Theodore Ts'o
parent 6e34eeddf7
commit 430db323fa
1 changed files with 18 additions and 5 deletions
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23
fs/ext3/inode.c
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@ -1521,12 +1521,16 @@ static int ext3_ordered_writepage(struct page *page,
if (!page_has_buffers(page)) {
create_empty_buffers(page, inode->i_sb->s_blocksize,
(1 << BH_Dirty)|(1 << BH_Uptodate));
} else if (!walk_page_buffers(NULL, page_buffers(page), 0, PAGE_CACHE_SIZE, NULL, buffer_unmapped)) {
/* Provide NULL instead of get_block so that we catch bugs if buffers weren't really mapped */
return block_write_full_page(page, NULL, wbc);
page_bufs = page_buffers(page);
} else {
page_bufs = page_buffers(page);
if (!walk_page_buffers(NULL, page_bufs, 0, PAGE_CACHE_SIZE,
NULL, buffer_unmapped)) {
/* Provide NULL get_block() to catch bugs if buffers
* weren't really mapped */
return block_write_full_page(page, NULL, wbc);
}
}
page_bufs = page_buffers(page);
handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
@ -1581,6 +1585,15 @@ static int ext3_writeback_writepage(struct page *page,
if (ext3_journal_current_handle())
goto out_fail;
if (page_has_buffers(page)) {
if (!walk_page_buffers(NULL, page_buffers(page), 0,
PAGE_CACHE_SIZE, NULL, buffer_unmapped)) {
/* Provide NULL get_block() to catch bugs if buffers
* weren't really mapped */
return block_write_full_page(page, NULL, wbc);
}
}
handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);