Hi Ted,
Today's linux-next merge of the ext4 tree got a conflict in
fs/ext4/inode.c between commit ebdec241d509cf69f6ebf1ecdc036359d3dbe154
("fs: kill block_prepare_write") from Linus' tree and commits
dd26005ac2f8b62a18fa33cfe082e94ff6151a73 ("ext4: simplify ext4_writepage
()") and a848e44595e1dfe55c3e85432ab018c49674281f ("ext4: inline
ext4_writepage() into mpage_da_submit_io()") from the ext4 tree.
I fixed it up (see below) and can carry the fix as necessary.
(I do wish that all those commits had appeared in linux-next some time
before today ...)
--
Cheers,
Stephen Rothwell sfr@xxxxxxxxxxxxxxxx
diff --cc fs/ext4/inode.c
index 49635ef,45fc5bd..0000000
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@@ -2030,86 -2062,32 +2062,32 @@@ static int mpage_da_submit_io(struct mp
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
- pages_skipped = mpd->wbc->pages_skipped;
- err = mapping->a_ops->writepage(page, mpd->wbc);
- if (!err && (pages_skipped == mpd->wbc->pages_skipped))
- /*
- * have successfully written the page
- * without skipping the same
- */
- mpd->pages_written++;
/*
- * In error case, we have to continue because
- * remaining pages are still locked
- * XXX: unlock and re-dirty them?
+ * If the page does not have buffers (for
+ * whatever reason), try to create them using
- * block_prepare_write. If this fails,
++ * __block_write_begin. If this fails,
+ * redirty the page and move on.
*/
- if (ret == 0)
- ret = err;
- }
- pagevec_release(&pvec);
- }
- return ret;
- }
-
- /*
- * mpage_put_bnr_to_bhs - walk blocks and assign them actual numbers
- *
- * the function goes through all passed space and put actual disk
- * block numbers into buffer heads, dropping BH_Delay and BH_Unwritten
- */
- static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd,
- struct ext4_map_blocks *map)
- {
- struct inode *inode = mpd->inode;
- struct address_space *mapping = inode->i_mapping;
- int blocks = map->m_len;
- sector_t pblock = map->m_pblk, cur_logical;
- struct buffer_head *head, *bh;
- pgoff_t index, end;
- struct pagevec pvec;
- int nr_pages, i;
-
- index = map->m_lblk >> (PAGE_CACHE_SHIFT - inode->i_blkbits);
- end = (map->m_lblk + blocks - 1) >> (PAGE_CACHE_SHIFT - inode->i_blkbits);
- cur_logical = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
-
- pagevec_init(&pvec, 0);
-
- while (index <= end) {
- /* XXX: optimize tail */
- nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
- if (nr_pages == 0)
- break;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
-
- index = page->index;
- if (index > end)
- break;
- index++;
-
- BUG_ON(!PageLocked(page));
- BUG_ON(PageWriteback(page));
- BUG_ON(!page_has_buffers(page));
-
- bh = page_buffers(page);
- head = bh;
-
- /* skip blocks out of the range */
- do {
- if (cur_logical >= map->m_lblk)
- break;
- cur_logical++;
- } while ((bh = bh->b_this_page) != head);
+ if (!page_has_buffers(page)) {
- if (block_prepare_write(page, 0, len,
++ if (__block_write_begin(page, 0, len,
+ noalloc_get_block_write)) {
+ redirty_page:
+ redirty_page_for_writepage(mpd->wbc,
+ page);
+ unlock_page(page);
+ continue;
+ }
+ commit_write = 1;
+ }
+ bh = page_bufs = page_buffers(page);
+ block_start = 0;
do {
- if (cur_logical >= map->m_lblk + blocks)
- break;
-
- if (buffer_delay(bh) || buffer_unwritten(bh)) {
-
- BUG_ON(bh->b_bdev != inode->i_sb->s_bdev);
-
+ if (!bh)
+ goto redirty_page;
+ if (map && (cur_logical >= map->m_lblk) &&
+ (cur_logical <= (map->m_lblk +
+ (map->m_len - 1)))) {
if (buffer_delay(bh)) {
clear_buffer_delay(bh);
bh->b_blocknr = pblock;
@@@ -2712,18 -2714,15 +2713,15 @@@ static int ext4_writepage(struct page *
else
len = PAGE_CACHE_SIZE;
- if (page_has_buffers(page)) {
- page_bufs = page_buffers(page);
- if (walk_page_buffers(NULL, page_bufs, 0, len, NULL,
- ext4_bh_delay_or_unwritten)) {
- /*
- * We don't want to do block allocation
- * So redirty the page and return
- * We may reach here when we do a journal commit
- * via journal_submit_inode_data_buffers.
- * If we don't have mapping block we just ignore
- * them. We can also reach here via shrink_page_list
- */
+ /*
+ * If the page does not have buffers (for whatever reason),
- * try to create them using block_prepare_write. If this
++ * try to create them using __block_write_begin. If this
+ * fails, redirty the page and move on.
+ */
+ if (!page_buffers(page)) {
- if (block_prepare_write(page, 0, len,
++ if (__block_write_begin(page, 0, len,
+ noalloc_get_block_write)) {
+ redirty_page:
redirty_page_for_writepage(wbc, page);
unlock_page(page);
return 0;
--
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