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authorTheodore Ts'o <tytso@mit.edu>2009-02-23 22:42:39 +0100
committerTheodore Ts'o <tytso@mit.edu>2009-02-23 22:42:39 +0100
commitf63e6005bc63acc0a6bc3bdb8f971dcfbd827185 (patch)
tree22f40e4c70fd9d6fecd36926ae1087d59522098d /fs/ext4
parentext4: Save stack space by removing fake buffer heads (diff)
downloadlinux-f63e6005bc63acc0a6bc3bdb8f971dcfbd827185.tar.xz
linux-f63e6005bc63acc0a6bc3bdb8f971dcfbd827185.zip
ext4: Simplify delalloc code by removing mpage_da_writepages()
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/inode.c74
1 files changed, 32 insertions, 42 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 008b28a859d0..24d0f9d2b320 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2242,47 +2242,6 @@ static int __mpage_da_writepage(struct page *page,
}
/*
- * 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);