Date:	Wed, 4 Jun 2008 17:59:55 +0200
From:	Jan Kara <jack@...e.cz>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH 4/5] ext4: Use new framework for data=ordered mode in JBD2

From: Jan Kara <jack@...e.cz>
Date: Thu, 22 May 2008 00:51:17 +0200
Subject: [PATCH] ext4: Use new framework for data=ordered mode in JBD2

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/ext4_i.h    |    1 +
 fs/ext4/ext4_jbd2.h |    7 ++-
 fs/ext4/ialloc.c    |    1 +
 fs/ext4/inode.c     |  160 ++++++++++++++++++---------------------------------
 fs/ext4/super.c     |    4 +-
 5 files changed, 67 insertions(+), 106 deletions(-)

Index: linux-2.6-linus/fs/ext4/ext4_i.h
===================================================================
--- linux-2.6-linus.orig/fs/ext4/ext4_i.h
+++ linux-2.6-linus/fs/ext4/ext4_i.h
@@ -150,6 +150,7 @@ struct ext4_inode_info {
 	 */
 	struct rw_semaphore i_data_sem;
 	struct inode vfs_inode;
+	struct jbd2_inode jinode;
 
 	unsigned long i_ext_generation;
 	struct ext4_ext_cache i_cached_extent;
Index: linux-2.6-linus/fs/ext4/ext4_jbd2.h
===================================================================
--- linux-2.6-linus.orig/fs/ext4/ext4_jbd2.h
+++ linux-2.6-linus/fs/ext4/ext4_jbd2.h
@@ -154,8 +154,6 @@ int __ext4_journal_dirty_metadata(const
 #define ext4_journal_forget(handle, bh) \
 	__ext4_journal_forget(__FUNCTION__, (handle), (bh))
 
-int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
-
 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
 int __ext4_journal_stop(const char *where, handle_t *handle);
 
@@ -192,6 +190,11 @@ static inline int ext4_journal_force_com
 	return jbd2_journal_force_commit(journal);
 }
 
+static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
+{
+	return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode);
+}
+
 /* super.c */
 int ext4_force_commit(struct super_block *sb);
 
Index: linux-2.6-linus/fs/ext4/ialloc.c
===================================================================
--- linux-2.6-linus.orig/fs/ext4/ialloc.c
+++ linux-2.6-linus/fs/ext4/ialloc.c
@@ -820,6 +820,7 @@ got:
 	ei->i_state = EXT4_STATE_NEW;
 
 	ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize;
+	jbd2_journal_init_jbd_inode(&ei->jinode, inode);
 
 	ret = inode;
 	if(DQUOT_ALLOC_INODE(inode)) {
Index: linux-2.6-linus/fs/ext4/inode.c
===================================================================
--- linux-2.6-linus.orig/fs/ext4/inode.c
+++ linux-2.6-linus/fs/ext4/inode.c
@@ -39,6 +39,13 @@
 #include "xattr.h"
 #include "acl.h"
 
+static inline int ext4_begin_ordered_truncate(struct inode *inode,
+					      loff_t new_size)
+{
+	return jbd2_journal_begin_ordered_truncate(&EXT4_I(inode)->jinode,
+						   new_size);
+}
+
 /*
  * Test whether an inode is a fast symlink.
  */
@@ -181,6 +188,8 @@ void ext4_delete_inode (struct inode * i
 {
 	handle_t *handle;
 
+	if (ext4_should_order_data(inode))
+		ext4_begin_ordered_truncate(inode, 0);
 	truncate_inode_pages(&inode->i_data, 0);
 
 	if (is_bad_inode(inode))
@@ -1273,15 +1282,6 @@ out:
 	return ret;
 }
 
-int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
-{
-	int err = jbd2_journal_dirty_data(handle, bh);
-	if (err)
-		ext4_journal_abort_handle(__func__, __func__,
-						bh, handle, err);
-	return err;
-}
-
 /* For write_end() in data=journal mode */
 static int write_end_fn(handle_t *handle, struct buffer_head *bh)
 {
@@ -1311,8 +1311,7 @@ static int ext4_ordered_write_end(struct
 	from = pos & (PAGE_CACHE_SIZE - 1);
 	to = from + len;
 
-	ret = walk_page_buffers(handle, page_buffers(page),
-		from, to, NULL, ext4_journal_dirty_data);
+	ret = ext4_jbd2_file_inode(handle, inode);
 
 	if (ret == 0) {
 		/*
@@ -1472,25 +1471,22 @@ static int bput_one(handle_t *handle, st
 	return 0;
 }
 
-static int jbd2_journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
-{
-	if (buffer_mapped(bh))
-		return ext4_journal_dirty_data(handle, bh);
-	return 0;
-}
-
 static int ext4_bh_unmapped_or_delay(handle_t *handle, struct buffer_head *bh)
 {
 	return !buffer_mapped(bh) || buffer_delay(bh);
 }
 
 /*
- * Note that we don't need to start a transaction unless we're journaling
- * data because we should have holes filled from ext4_page_mkwrite(). If
- * we are journaling data, we cannot start transaction directly because
- * transaction start ranks above page lock so we have to do some magic...
+ * Note that we don't need to start a transaction unless we're journaling data
+ * because we should have holes filled from ext4_page_mkwrite(). We even don't
+ * need to file the inode to the transaction's list in ordered mode because if
+ * we are writing back data added by write(), the inode is already there and if
+ * we are writing back data modified via mmap(), noone guarantees in which
+ * transaction the data will hit the disk. In case we are journaling data, we
+ * cannot start transaction directly because transaction start ranks above page
+ * lock so we have to do some magic.
  *
- * In all journalling modes block_write_full_page() will start the I/O.
+ * In all journaling modes block_write_full_page() will start the I/O.
  *
  * Problem:
  *
@@ -1533,86 +1529,7 @@ static int ext4_bh_unmapped_or_delay(han
  * us.
  *
  */
-static int __ext4_ordered_writepage(struct page *page,
-				struct writeback_control *wbc)
-{
-	struct inode *inode = page->mapping->host;
-	struct buffer_head *page_bufs;
-	handle_t *handle = NULL;
-	int ret = 0;
-	int err;
-
-	if (!page_has_buffers(page)) {
-		create_empty_buffers(page, inode->i_sb->s_blocksize,
-				(1 << BH_Dirty)|(1 << BH_Uptodate));
-	}
-	page_bufs = page_buffers(page);
-	walk_page_buffers(handle, page_bufs, 0,
-			PAGE_CACHE_SIZE, NULL, bget_one);
-
-	ret = block_write_full_page(page, ext4_get_block, wbc);
-
-	/*
-	 * The page can become unlocked at any point now, and
-	 * truncate can then come in and change things.  So we
-	 * can't touch *page from now on.  But *page_bufs is
-	 * safe due to elevated refcount.
-	 */
-
-	/*
-	 * And attach them to the current transaction.  But only if
-	 * block_write_full_page() succeeded.  Otherwise they are unmapped,
-	 * and generally junk.
-	 */
-	if (ret == 0) {
-		handle = ext4_journal_start(inode,
-					ext4_writepage_trans_blocks(inode));
-		if (IS_ERR(handle)) {
-			ret = PTR_ERR(handle);
-			goto out_put;
-		}
-
-		ret = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE,
-					NULL, jbd2_journal_dirty_data_fn);
-		err = ext4_journal_stop(handle);
-		if (!ret)
-			ret = err;
-	}
-out_put:
-	walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE, NULL,
-			  bput_one);
-	return ret;
-}
-
-static int ext4_ordered_writepage(struct page *page,
-				struct writeback_control *wbc)
-{
-	struct inode *inode = page->mapping->host;
-	loff_t size = i_size_read(inode);
-	loff_t len;
-
-	J_ASSERT(PageLocked(page));
-	J_ASSERT(page_has_buffers(page));
-	if (page->index == size >> PAGE_CACHE_SHIFT)
-		len = size & ~PAGE_CACHE_MASK;
-	else
-		len = PAGE_CACHE_SIZE;
-	BUG_ON(walk_page_buffers(NULL, page_buffers(page), 0, len, NULL,
-				 ext4_bh_unmapped_or_delay));
-
-	/*
-	 * We give up here if we're reentered, because it might be for a
-	 * different filesystem.
-	 */
-	if (!ext4_journal_current_handle())
-		return __ext4_ordered_writepage(page, wbc);
-
-	redirty_page_for_writepage(wbc, page);
-	unlock_page(page);
-	return 0;
-}
-
-static int __ext4_writeback_writepage(struct page *page,
+static int __ext4_normal_writepage(struct page *page,
 				struct writeback_control *wbc)
 {
 	struct inode *inode = page->mapping->host;
@@ -1624,7 +1541,7 @@ static int __ext4_writeback_writepage(st
 }
 
 
-static int ext4_writeback_writepage(struct page *page,
+static int ext4_normal_writepage(struct page *page,
 				struct writeback_control *wbc)
 {
 	struct inode *inode = page->mapping->host;
@@ -1641,7 +1558,7 @@ static int ext4_writeback_writepage(stru
 				 ext4_bh_unmapped_or_delay));
 
 	if (!ext4_journal_current_handle())
-		return __ext4_writeback_writepage(page, wbc);
+		return __ext4_normal_writepage(page, wbc);
 
 	redirty_page_for_writepage(wbc, page);
 	unlock_page(page);
@@ -1877,7 +1794,7 @@ static int ext4_journalled_set_page_dirt
 static const struct address_space_operations ext4_ordered_aops = {
 	.readpage	= ext4_readpage,
 	.readpages	= ext4_readpages,
-	.writepage	= ext4_ordered_writepage,
+	.writepage	= ext4_normal_writepage,
 	.sync_page	= block_sync_page,
 	.write_begin	= ext4_write_begin,
 	.write_end	= ext4_ordered_write_end,
@@ -1891,7 +1808,7 @@ static const struct address_space_operat
 static const struct address_space_operations ext4_writeback_aops = {
 	.readpage	= ext4_readpage,
 	.readpages	= ext4_readpages,
-	.writepage	= ext4_writeback_writepage,
+	.writepage	= ext4_normal_writepage,
 	.sync_page	= block_sync_page,
 	.write_begin	= ext4_write_begin,
 	.write_end	= ext4_writeback_write_end,
@@ -2019,7 +1936,7 @@ int ext4_block_truncate_page(handle_t *h
 		err = ext4_journal_dirty_metadata(handle, bh);
 	} else {
 		if (ext4_should_order_data(inode))
-			err = ext4_journal_dirty_data(handle, bh);
+			err = ext4_jbd2_file_inode(handle, inode);
 		mark_buffer_dirty(bh);
 	}
 
@@ -2787,6 +2704,7 @@ struct inode *ext4_iget(struct super_blo
 	ei->i_default_acl = EXT4_ACL_NOT_CACHED;
 #endif
 	ei->i_block_alloc_info = NULL;
+	jbd2_journal_init_jbd_inode(&ei->jinode, inode);
 
 	ret = __ext4_get_inode_loc(inode, &iloc, 0);
 	if (ret < 0)
@@ -3149,7 +3067,14 @@ int ext4_write_inode(struct inode *inode
  * be freed, so we have a strong guarantee that no future commit will
  * leave these blocks visible to the user.)
  *
- * Called with inode->sem down.
+ * Another thing we have to assure is that if we are in ordered mode
+ * and inode is still attached to the committing transaction, we must
+ * we start writeout of all the dirty pages which are being truncated.
+ * This way we are sure that all the data written in the previous
+ * transaction are already on disk (truncate waits for pages under
+ * writeback).
+ *
+ * Called with inode->i_mutex down.
  */
 int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 {
@@ -3215,6 +3140,22 @@ int ext4_setattr(struct dentry *dentry,
 		if (!error)
 			error = rc;
 		ext4_journal_stop(handle);
+
+		if (ext4_should_order_data(inode)) {
+			error = ext4_begin_ordered_truncate(inode,
+							    attr->ia_size);
+			if (error) {
+				/* Do as much error cleanup as possible */
+				handle = ext4_journal_start(inode, 3);
+				if (IS_ERR(handle)) {
+					ext4_orphan_del(NULL, inode);
+					goto err_out;
+				}
+				ext4_orphan_del(handle, inode);
+				ext4_journal_stop(handle);
+				goto err_out;
+			}
+		}
 	}
 
 	rc = inode_setattr(inode, attr);
@@ -3624,12 +3565,13 @@ int ext4_page_mkwrite(struct vm_area_str
 	lock_page(page);
 	wbc.range_start = page_offset(page);
 	wbc.range_end = page_offset(page) + len;
-	if (ext4_should_writeback_data(inode))
-		ret = __ext4_writeback_writepage(page, &wbc);
-	else if (ext4_should_order_data(inode))
-		ret = __ext4_ordered_writepage(page, &wbc);
-	else
+	if (!ext4_should_journal_data(inode)) {
+		ret = __ext4_normal_writepage(page, &wbc);
+		if (!ret && ext4_should_order_data(inode))
+			ret = ext4_jbd2_file_inode(handle, inode);
+	} else {
 		ret = __ext4_journalled_writepage(page, &wbc);
+	}
 	/* Page got unlocked in writepage */
 	err = ext4_journal_stop(handle);
 	if (!ret)
Index: linux-2.6-linus/fs/ext4/super.c
===================================================================
--- linux-2.6-linus.orig/fs/ext4/super.c
+++ linux-2.6-linus/fs/ext4/super.c
@@ -637,6 +637,8 @@ static void ext4_clear_inode(struct inod
 	EXT4_I(inode)->i_block_alloc_info = NULL;
 	if (unlikely(rsv))
 		kfree(rsv);
+	jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
+				       &EXT4_I(inode)->jinode);
 }
 
 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
@@ -3353,7 +3355,7 @@ static ssize_t ext4_quota_write(struct s
 			err = ext4_journal_dirty_metadata(handle, bh);
 		else {
 			/* Always do at least ordered writes for quotas */
-			err = ext4_journal_dirty_data(handle, bh);
+			err = ext4_jbd2_file_inode(handle, inode);
 			mark_buffer_dirty(bh);
 		}
 		brelse(bh);
Index: linux-2.6-linus/fs/ext4/mballoc.c
===================================================================
--- linux-2.6-linus.orig/fs/ext4/mballoc.c
+++ linux-2.6-linus/fs/ext4/mballoc.c
@@ -2255,6 +2255,8 @@ static int ext4_mb_init_backend(struct s
 		printk(KERN_ERR "EXT4-fs: can't get new inode\n");
 		goto err_freesgi;
 	}
+	jbd2_journal_init_jbd_inode(&EXT4_I(sbi->s_buddy_cache)->jinode,
+				    sbi->s_buddy_cache);
 	EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;
 
 	metalen = sizeof(*meta_group_info) << EXT4_DESC_PER_BLOCK_BITS(sb);
--
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