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ext4: Simplify delalloc code by removing mpage_da_writepages()

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The mpage_da_writepages() function is only used in one place, so
inline it to simplify the call stack and make the code easier to
understand.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-02-23 16:42:39 -05:00
parent 8dc207c0e7
commit f63e6005bc
1 changed files with 32 additions and 42 deletions
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74
fs/ext4/inode.c
View file

@ -2241,47 +2241,6 @@ static int __mpage_da_writepage(struct page *page,
return 0;
}
/*
* mpage_da_writepages - walk the list of dirty pages of the given
* address space, allocates non-allocated blocks, maps newly-allocated
* blocks to existing bhs and issue IO them
*
* @mapping: address space structure to write
* @wbc: subtract the number of written pages from *@wbc->nr_to_write
*
* This is a library function, which implements the writepages()
* address_space_operation.
*/
static int mpage_da_writepages(struct address_space *mapping,
struct writeback_control *wbc,
struct mpage_da_data *mpd)
{
int ret;
mpd->b_size = 0;
mpd->b_state = 0;
mpd->b_blocknr = 0;
mpd->first_page = 0;
mpd->next_page = 0;
mpd->io_done = 0;
mpd->pages_written = 0;
mpd->retval = 0;
ret = write_cache_pages(mapping, wbc, __mpage_da_writepage, mpd);
/*
* Handle last extent of pages
*/
if (!mpd->io_done && mpd->next_page != mpd->first_page) {
if (mpage_da_map_blocks(mpd) == 0)
mpage_da_submit_io(mpd);
mpd->io_done = 1;
ret = MPAGE_DA_EXTENT_TAIL;
}
wbc->nr_to_write -= mpd->pages_written;
return ret;
}
/*
* this is a special callback for ->write_begin() only
* it's intention is to return mapped block or reserve space
@ -2571,7 +2530,38 @@ retry:
dump_stack();
goto out_writepages;
}
ret = mpage_da_writepages(mapping, wbc, &mpd);
/*
* Now call __mpage_da_writepage to find the next
* contiguous region of logical blocks that need
* blocks to be allocated by ext4. We don't actually
* submit the blocks for I/O here, even though
* write_cache_pages thinks it will, and will set the
* pages as clean for write before calling
* __mpage_da_writepage().
*/
mpd.b_size = 0;
mpd.b_state = 0;
mpd.b_blocknr = 0;
mpd.first_page = 0;
mpd.next_page = 0;
mpd.io_done = 0;
mpd.pages_written = 0;
mpd.retval = 0;
ret = write_cache_pages(mapping, wbc, __mpage_da_writepage,
&mpd);
/*
* If we have a contigous extent of pages and we
* haven't done the I/O yet, map the blocks and submit
* them for I/O.
*/
if (!mpd.io_done && mpd.next_page != mpd.first_page) {
if (mpage_da_map_blocks(&mpd) == 0)
mpage_da_submit_io(&mpd);
mpd.io_done = 1;
ret = MPAGE_DA_EXTENT_TAIL;
}
wbc->nr_to_write -= mpd.pages_written;
ext4_journal_stop(handle);