support multiple block allocation for ext3 writeback mode through writepages().
---
linux-2.6.12-ming/fs/ext3/inode.c | 131 ++++++++++++++++++++++++++++++++
linux-2.6.12-ming/fs/mpage.c | 8 +
linux-2.6.12-ming/include/linux/mpage.h | 17 ++++
3 files changed, 153 insertions(+), 3 deletions(-)
diff -puN fs/ext3/inode.c~writepages fs/ext3/inode.c
--- linux-2.6.12/fs/ext3/inode.c~writepages 2005-07-17 17:11:43.239274864
-0700
+++ linux-2.6.12-ming/fs/ext3/inode.c 2005-07-17 17:11:43.259271824 -0700
@@ -36,6 +36,7 @@
#include <linux/writeback.h>
#include <linux/mpage.h>
#include <linux/uio.h>
+#include <linux/pagevec.h>
#include "xattr.h"
#include "acl.h"
@@ -1719,6 +1720,135 @@ out_fail:
return ret;
}
+static int
+ext3_writeback_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct inode *inode = mapping->host;
+ const unsigned blkbits = inode->i_blkbits;
+ int err = 0;
+ int ret = 0;
+ int done = 0;
+ unsigned int max_pages_to_cluster = 0;
+ struct pagevec pvec;
+ int nr_pages;
+ pgoff_t index;
+ pgoff_t end = -1; /* Inclusive */
+ int scanned = 0;
+ int is_range = 0;
+ struct page *page;
+ struct mpageio mio = {
+ .bio = NULL
+ };
+
+ pagevec_init(&pvec, 0);
+ if (wbc->sync_mode == WB_SYNC_NONE) {
+ index = mapping->writeback_index; /* Start from prev offset */
+ } else {
+ index = 0; /* whole-file sweep */
+ scanned = 1;
+ }
+ if (wbc->start || wbc->end) {
+ index = wbc->start >> PAGE_CACHE_SHIFT;
+ end = wbc->end >> PAGE_CACHE_SHIFT;
+ is_range = 1;
+ scanned = 1;
+ }
+ max_pages_to_cluster = min(EXT3_MAX_TRANS_DATA, (pgoff_t)PAGEVEC_SIZE);
+
+retry:
+ down_read(&inode->i_alloc_sem);
+ while (!done && (index <= end) &&
+ (nr_pages = pagevec_contig_lookup_tag(&pvec, mapping,
+ &index, PAGECACHE_TAG_DIRTY,
+ min(end - index, max_pages_to_cluster-1) + 1))) {
+ unsigned i;
+
+ scanned = 1;
+ for (i = 0; i < nr_pages; i++) {
+ page = pvec.pages[i];
+
+ lock_page(page);
+
+ if (unlikely(page->mapping != mapping)) {
+ unlock_page(page);
+ break;
+ }
+
+ if (unlikely(is_range) && page->index > end) {
+ unlock_page(page);
+ break;
+ }
+
+ if (wbc->sync_mode != WB_SYNC_NONE)
+ wait_on_page_writeback(page);
+
+ if (PageWriteback(page) ||
+ !clear_page_dirty_for_io(page)) {
+ unlock_page(page);
+ break;
+ }
+ }
+
+ if (i) {
+ unsigned j;
+ handle_t *handle;
+
+ page = pvec.pages[i-1];
+ index = page->index + 1;
+ mio.final_block_in_request =
+ min(index, end) << (PAGE_CACHE_SHIFT - blkbits);
+
+ handle = ext3_journal_start(inode,
+ i + ext3_writepage_trans_blocks(inode));
+
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ done = 1;
+ }
+ for (j = 0; j < i; j++) {
+ page = pvec.pages[j];
+ if (!done) {
+ ret = __mpage_writepage(&mio, page,
+ ext3_writepages_get_blocks, wbc,
+
ext3_writeback_writepage_helper);
+ if (ret || (--(wbc->nr_to_write) <= 0))
+ done = 1;
+ } else {
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ }
+ }
+ if (!err && mio.bio)
+ mio.bio = mpage_bio_submit(WRITE, mio.bio);
+ if (!err)
+ err = ext3_journal_stop(handle);
+ if (!ret) {
+ ret = err;
+ if (ret)
+ done = 1;
+ }
+ }
+ pagevec_release(&pvec);
+ cond_resched();
+ }
+
+ up_read(&inode->i_alloc_sem);
+
+ if (!scanned && !done) {
+ /*
+ * We hit the last page and there is more work to be done: wrap
+ * back to the start of the file
+ */
+ scanned = 1;
+ index = 0;
+ goto retry;
+ }
+ if (!is_range)
+ mapping->writeback_index = index;
+ return ret;
+}
+
static int ext3_journalled_writepage(struct page *page,
struct writeback_control *wbc)
{
@@ -1923,6 +2053,7 @@ static struct address_space_operations e
.readpage = ext3_readpage,
.readpages = ext3_readpages,
.writepage = ext3_writeback_writepage,
+ .writepages = ext3_writeback_writepages,
.sync_page = block_sync_page,
.prepare_write = ext3_prepare_write,
.commit_write = ext3_writeback_commit_write,
diff -puN fs/mpage.c~writepages fs/mpage.c
--- linux-2.6.12/fs/mpage.c~writepages 2005-07-17 17:11:43.243274256 -0700
+++ linux-2.6.12-ming/fs/mpage.c 2005-07-17 17:12:43.220156384 -0700
@@ -90,7 +90,7 @@ static int mpage_end_io_write(struct bio
return 0;
}
-static struct bio *mpage_bio_submit(int rw, struct bio *bio)
+struct bio *mpage_bio_submit(int rw, struct bio *bio)
{
bio->bi_end_io = mpage_end_io_read;
if (rw == WRITE)
@@ -373,6 +373,7 @@ int mpage_readpage(struct page *page, ge
}
EXPORT_SYMBOL(mpage_readpage);
+#if 0
struct mpageio {
struct bio *bio;
struct buffer_head map_bh;
@@ -383,6 +384,7 @@ struct mpageio {
sector_t boundary_block;
struct block_device *boundary_bdev;
};
+#endif
/*
* Maps as many contiguous disk blocks as it can within the range of
@@ -450,7 +452,7 @@ static unsigned long mpage_get_more_bloc
* written, so it can intelligently allocate a suitably-sized BIO. For now,
* just allocate full-size (16-page) BIOs.
*/
-static int
+int
__mpage_writepage(struct mpageio *mio, struct page *page,
get_blocks_t get_blocks, struct writeback_control *wbc,
writepage_t writepage_fn)
@@ -532,7 +534,7 @@ __mpage_writepage(struct mpageio *mio, s
*/
BUG_ON(!PageUptodate(page));
block_in_file = page->index << (PAGE_CACHE_SHIFT - blkbits);
- last_block = (i_size - 1) >> blkbits;
+ last_block = (i_size) >> blkbits;
blocks_to_skip = block_in_file - mio->block_in_file;
mio->block_in_file = block_in_file;
if (blocks_to_skip < (map_bh->b_size >> blkbits)) {
diff -puN include/linux/mpage.h~writepages include/linux/mpage.h
--- linux-2.6.12/include/linux/mpage.h~writepages 2005-07-17
17:11:43.246273800 -0700
+++ linux-2.6.12-ming/include/linux/mpage.h 2005-07-17 17:11:43.263271216
-0700
@@ -9,9 +9,23 @@
* (And no, it doesn't do the #ifdef __MPAGE_H thing, and it doesn't do
* nested includes. Get it right in the .c file).
*/
+#ifndef _LINUX_BUFFER_HEAD_H
+#include <linux/buffer_head.h>
+#endif
struct writeback_control;
+struct mpageio {
+ struct bio *bio;
+ struct buffer_head map_bh;
+ unsigned long block_in_file;
+ unsigned long final_block_in_request;
+ sector_t block_in_bio;
+ int boundary;
+ sector_t boundary_block;
+ struct block_device *boundary_bdev;
+};
+
int mpage_readpages(struct address_space *mapping, struct list_head *pages,
unsigned nr_pages, get_block_t get_block);
int mpage_readpage(struct page *page, get_block_t get_block);
@@ -23,6 +37,9 @@ int mpage_writepage(struct page *page, g
int __mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_blocks_t get_blocks,
writepage_t writepage);
+int __mpage_writepage(struct mpageio *mio, struct page *page,
+ get_blocks_t get_blocks, struct writeback_control *wbc,
+ writepage_t writepage_fn);
static inline int
generic_writepages(struct address_space *mapping, struct writeback_control
*wbc)
_
-
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