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ext4: inline ext4_writepage() into mpage_da_submit_io() 

As a prepratory step to switching to bio_submit, inline
ext4_writepage() into mpage_da_submit() and then simplify things a
bit.  This makes it clearer what mpage_da_submit needs to do.

Also, move the ClearPageChecked(page) call into
__ext4_journalled_writepage(), as a minor bit of cleanup refactoring.

This also allows us to pull i_size_read() and
ext4_should_journal_data() out of the loop, which should be a very
minor CPU savings.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2010-10-27 21:30:09 -04:00
parent a42afc5f56
commit cb20d51883
1 changed files with 59 additions and 11 deletions
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70
fs/ext4/inode.c
View File

@ -60,7 +60,12 @@ static inline int ext4_begin_ordered_truncate(struct inode *inode,
}
static void ext4_invalidatepage(struct page *page, unsigned long offset);
static int ext4_writepage(struct page *page, struct writeback_control *wbc);
static int noalloc_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode);
static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate);
static int __ext4_journalled_writepage(struct page *page, unsigned int len);
static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh);
/*
* Test whether an inode is a fast symlink.
@ -2000,12 +2005,15 @@ static void ext4_da_page_release_reservation(struct page *page,
*/
static int mpage_da_submit_io(struct mpage_da_data *mpd)
{
long pages_skipped;
struct pagevec pvec;
unsigned long index, end;
int ret = 0, err, nr_pages, i;
struct inode *inode = mpd->inode;
struct address_space *mapping = inode->i_mapping;
loff_t size = i_size_read(inode);
unsigned int len;
struct buffer_head *page_bufs = NULL;
int journal_data = ext4_should_journal_data(inode);
BUG_ON(mpd->next_page <= mpd->first_page);
/*
@ -2023,28 +2031,69 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd)
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
int commit_write = 0;
struct page *page = pvec.pages[i];
index = page->index;
if (index > end)
break;
if (index == size >> PAGE_CACHE_SHIFT)
len = size & ~PAGE_CACHE_MASK;
else
len = PAGE_CACHE_SIZE;
index++;
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
pages_skipped = mpd->wbc->pages_skipped;
err = ext4_writepage(page, mpd->wbc);
if (!err && (pages_skipped == mpd->wbc->pages_skipped))
/*
* If the page does not have buffers (for
* whatever reason), try to create them using
* block_prepare_write. If this fails,
* redirty the page and move on.
*/
if (!page_has_buffers(page)) {
if (block_prepare_write(page, 0, len,
noalloc_get_block_write)) {
redirty_page:
redirty_page_for_writepage(mpd->wbc,
page);
unlock_page(page);
continue;
}
commit_write = 1;
}
page_bufs = page_buffers(page);
if (walk_page_buffers(NULL, page_bufs, 0, len, NULL,
ext4_bh_delay_or_unwritten)) {
/*
* have successfully written the page
* without skipping the same
* We couldn't do block allocation for
* some reason.
*/
goto redirty_page;
}
if (commit_write)
/* mark the buffer_heads as dirty & uptodate */
block_commit_write(page, 0, len);
if (journal_data && PageChecked(page))
err = __ext4_journalled_writepage(page, len);
else if (buffer_uninit(page_bufs)) {
ext4_set_bh_endio(page_bufs, inode);
err = block_write_full_page_endio(page,
noalloc_get_block_write,
mpd->wbc, ext4_end_io_buffer_write);
} else
err = block_write_full_page(page,
noalloc_get_block_write, mpd->wbc);
if (!err)
mpd->pages_written++;
/*
* In error case, we have to continue because
* remaining pages are still locked
* XXX: unlock and re-dirty them?
*/
if (ret == 0)
ret = err;
@ -2627,6 +2676,7 @@ static int __ext4_journalled_writepage(struct page *page,
int ret = 0;
int err;
ClearPageChecked(page);
page_bufs = page_buffers(page);
BUG_ON(!page_bufs);
walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one);
@ -2749,14 +2799,12 @@ static int ext4_writepage(struct page *page,
/* now mark the buffer_heads as dirty and uptodate */
block_commit_write(page, 0, len);
if (PageChecked(page) && ext4_should_journal_data(inode)) {
if (PageChecked(page) && ext4_should_journal_data(inode))
/*
* It's mmapped pagecache. Add buffers and journal it. There
* doesn't seem much point in redirtying the page here.
*/
ClearPageChecked(page);
return __ext4_journalled_writepage(page, len);
}
if (buffer_uninit(page_bufs)) {
ext4_set_bh_endio(page_bufs, inode);