From d17d7fa44dbe1f12031773e27eda9e939024a037 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Thu, 5 May 2005 16:16:02 -0700 Subject: [PATCH] [PATCH] revert ext3-writepages-support-for-writeback-mode This had a fatal lock ranking bug: we do journal_start outside mpage_writepages()'s lock_page(). Revert the whole thing, think again. Credit-to: Jan Kara For identifying the bug. Cc: Badari Pulavarty Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext3/inode.c | 46 ------------------------------------------- fs/mpage.c | 12 +---------- include/linux/mpage.h | 3 --- 3 files changed, 1 insertion(+), 60 deletions(-) diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index ea5888688f..0d5fa73b18 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -844,12 +844,6 @@ get_block: return ret; } -static int ext3_writepages_get_block(struct inode *inode, sector_t iblock, - struct buffer_head *bh, int create) -{ - return ext3_direct_io_get_blocks(inode, iblock, 1, bh, create); -} - /* * `handle' can be NULL if create is zero */ @@ -1323,45 +1317,6 @@ out_fail: return ret; } -static int -ext3_writeback_writepage_helper(struct page *page, - struct writeback_control *wbc) -{ - return block_write_full_page(page, ext3_get_block, wbc); -} - -static int -ext3_writeback_writepages(struct address_space *mapping, - struct writeback_control *wbc) -{ - struct inode *inode = mapping->host; - handle_t *handle = NULL; - int err, ret = 0; - - if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) - return ret; - - handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - return ret; - } - - ret = __mpage_writepages(mapping, wbc, ext3_writepages_get_block, - ext3_writeback_writepage_helper); - - /* - * Need to reaquire the handle since ext3_writepages_get_block() - * can restart the handle - */ - handle = journal_current_handle(); - - err = ext3_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - static int ext3_writeback_writepage(struct page *page, struct writeback_control *wbc) { @@ -1599,7 +1554,6 @@ static struct address_space_operations ext3_writeback_aops = { .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 --git a/fs/mpage.c b/fs/mpage.c index 32c7c8fcfc..68db5256a7 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -626,15 +626,6 @@ out: int mpage_writepages(struct address_space *mapping, struct writeback_control *wbc, get_block_t get_block) -{ - return __mpage_writepages(mapping, wbc, get_block, - mapping->a_ops->writepage); -} - -int -__mpage_writepages(struct address_space *mapping, - struct writeback_control *wbc, get_block_t get_block, - writepage_t writepage_fn) { struct backing_dev_info *bdi = mapping->backing_dev_info; struct bio *bio = NULL; @@ -725,7 +716,7 @@ retry: } else { bio = __mpage_writepage(bio, page, get_block, &last_block_in_bio, &ret, wbc, - writepage_fn); + page->mapping->a_ops->writepage); } if (unlikely(ret == WRITEPAGE_ACTIVATE)) unlock_page(page); @@ -755,7 +746,6 @@ retry: return ret; } EXPORT_SYMBOL(mpage_writepages); -EXPORT_SYMBOL(__mpage_writepages); int mpage_writepage(struct page *page, get_block_t get_block, struct writeback_control *wbc) diff --git a/include/linux/mpage.h b/include/linux/mpage.h index dea1b00836..3ca880463c 100644 --- a/include/linux/mpage.h +++ b/include/linux/mpage.h @@ -20,9 +20,6 @@ int mpage_writepages(struct address_space *mapping, struct writeback_control *wbc, get_block_t get_block); int mpage_writepage(struct page *page, get_block_t *get_block, struct writeback_control *wbc); -int __mpage_writepages(struct address_space *mapping, - struct writeback_control *wbc, get_block_t get_block, - writepage_t writepage); static inline int generic_writepages(struct address_space *mapping, struct writeback_control *wbc) -- 2.39.5