diff --git a/fs/Kconfig b/fs/Kconfig
index ac9ba1c..db4d133 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -143,24 +143,24 @@
 config EXT4DEV_FS
 	tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)"
 	depends on EXPERIMENTAL
-        select JBD
-        help
+	select JBD2
+	help
 	  Ext4dev is a predecessor filesystem of the next generation
 	  extended fs ext4, based on ext3 filesystem code. It will be
 	  renamed ext4 fs later, once ext4dev is mature and stabilized.
 
-          Unlike the change from ext2 filesystem to ext3 filesystem,
-          the on-disk format of ext4dev is not the same as ext3 any more:
+	  Unlike the change from ext2 filesystem to ext3 filesystem,
+	  the on-disk format of ext4dev is not the same as ext3 any more:
 	  it is based on extent maps and it supports 48-bit physical block
-          numbers. These combined on-disk format changes will allow
+	  numbers. These combined on-disk format changes will allow
 	  ext4dev/ext4 to handle more than 16 TB filesystem volumes --
 	  a hard limit that ext3 cannot overcome without changing the
-          on-disk format.
+	  on-disk format.
 
 	  Other than extent maps and 48-bit block numbers, ext4dev also is
-          likely to have other new features such as persistent preallocation,
+	  likely to have other new features such as persistent preallocation,
 	  high resolution time stamps, and larger file support etc.  These
-          features will be added to ext4dev gradually.
+	  features will be added to ext4dev gradually.
 
 	  To compile this file system support as a module, choose M here. The
 	  module will be called ext4dev.  Be aware, however, that the filesystem
@@ -239,6 +239,38 @@
 	  generated.  To turn debugging off again, do
 	  "echo 0 > /proc/sys/fs/jbd-debug".
 
+config JBD2
+	tristate
+	help
+	  This is a generic journaling layer for block devices that support
+	  both 32-bit and 64-bit block numbers.  It is currently used by
+	  the ext4dev/ext4 filesystem, but it could also be used to add
+	  journal support to other file systems or block devices such
+	  as RAID or LVM.
+
+	  If you are using ext4dev/ext4, you need to say Y here. If you are not
+	  using ext4dev/ext4 then you will probably want to say N.
+
+	  To compile this device as a module, choose M here. The module will be
+	  called jbd2.  If you are compiling ext4dev/ext4 into the kernel,
+	  you cannot compile this code as a module.
+
+config JBD2_DEBUG
+	bool "JBD2 (ext4dev/ext4) debugging support"
+	depends on JBD2
+	help
+	  If you are using the ext4dev/ext4 journaled file system (or
+	  potentially any other filesystem/device using JBD2), this option
+	  allows you to enable debugging output while the system is running,
+	  in order to help track down any problems you are having.
+	  By default, the debugging output will be turned off.
+
+	  If you select Y here, then you will be able to turn on debugging
+	  with "echo N > /proc/sys/fs/jbd2-debug", where N is a number between
+	  1 and 5. The higher the number, the more debugging output is
+	  generated.  To turn debugging off again, do
+	  "echo 0 > /proc/sys/fs/jbd2-debug".
+
 config FS_MBCACHE
 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
 	tristate
diff --git a/fs/Makefile b/fs/Makefile
index 64396af..9a5ce93 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -64,6 +64,7 @@
 obj-$(CONFIG_EXT3_FS)		+= ext3/ # Before ext2 so root fs can be ext3
 obj-$(CONFIG_EXT4DEV_FS)	+= ext4/ # Before ext2 so root fs can be ext4dev
 obj-$(CONFIG_JBD)		+= jbd/
+obj-$(CONFIG_JBD2)		+= jbd2/
 obj-$(CONFIG_EXT2_FS)		+= ext2/
 obj-$(CONFIG_CRAMFS)		+= cramfs/
 obj-$(CONFIG_RAMFS)		+= ramfs/
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index d143489..0a965dd 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -9,7 +9,7 @@
 #include <linux/slab.h>
 #include <linux/capability.h>
 #include <linux/fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/ext4_fs.h>
 #include "xattr.h"
 #include "acl.h"
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 357e4e5..e9e9844 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -14,9 +14,9 @@
 #include <linux/time.h>
 #include <linux/capability.h>
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
 
@@ -526,12 +526,12 @@
 		 * transaction.
 		 *
 		 * Ideally we would want to allow that to happen, but to
-		 * do so requires making journal_forget() capable of
+		 * do so requires making jbd2_journal_forget() capable of
 		 * revoking the queued write of a data block, which
 		 * implies blocking on the journal lock.  *forget()
 		 * cannot block due to truncate races.
 		 *
-		 * Eventually we can fix this by making journal_forget()
+		 * Eventually we can fix this by making jbd2_journal_forget()
 		 * return a status indicating whether or not it was able
 		 * to revoke the buffer.  On successful revoke, it is
 		 * safe not to set the allocation bit in the committed
@@ -1382,7 +1382,7 @@
 
 	jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
 
-	return journal_force_commit_nested(EXT4_SB(sb)->s_journal);
+	return jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal);
 }
 
 /**
diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index f4b3570..11e93c1 100644
--- a/fs/ext4/bitmap.c
+++ b/fs/ext4/bitmap.c
@@ -8,7 +8,7 @@
  */
 
 #include <linux/buffer_head.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
 
 #ifdef EXT4FS_DEBUG
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index ec114d7..9833d5d 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -22,7 +22,7 @@
  */
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
 #include <linux/buffer_head.h>
 #include <linux/smp_lock.h>
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index d938fbe..0b622c0 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -20,9 +20,9 @@
 
 #include <linux/time.h>
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include "xattr.h"
 #include "acl.h"
 
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 272faa2..2a167d7 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -26,9 +26,9 @@
 #include <linux/fs.h>
 #include <linux/sched.h>
 #include <linux/writeback.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 
 /*
  * akpm: A new design for ext4_sync_file().
diff --git a/fs/ext4/hash.c b/fs/ext4/hash.c
index d15bb42..a679663 100644
--- a/fs/ext4/hash.c
+++ b/fs/ext4/hash.c
@@ -10,7 +10,7 @@
  */
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/sched.h>
 #include <linux/ext4_fs.h>
 #include <linux/cryptohash.h>
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 4b92066..34d39ae 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -14,9 +14,9 @@
 
 #include <linux/time.h>
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <linux/quotaops.h>
@@ -497,7 +497,7 @@
 				goto got;
 			}
 			/* we lost it */
-			journal_release_buffer(handle, bitmap_bh);
+			jbd2_journal_release_buffer(handle, bitmap_bh);
 
 			if (++ino < EXT4_INODES_PER_GROUP(sb))
 				goto repeat_in_this_group;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7275d60..0d96c7d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -25,8 +25,8 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/time.h>
-#include <linux/ext4_jbd.h>
-#include <linux/jbd.h>
+#include <linux/ext4_jbd2.h>
+#include <linux/jbd2.h>
 #include <linux/smp_lock.h>
 #include <linux/highuid.h>
 #include <linux/pagemap.h>
@@ -84,7 +84,7 @@
 	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
 	    (!is_metadata && !ext4_should_journal_data(inode))) {
 		if (bh) {
-			BUFFER_TRACE(bh, "call journal_forget");
+			BUFFER_TRACE(bh, "call jbd2_journal_forget");
 			return ext4_journal_forget(handle, bh);
 		}
 		return 0;
@@ -657,7 +657,7 @@
 failed:
 	/* Allocation failed, free what we already allocated */
 	for (i = 1; i <= n ; i++) {
-		BUFFER_TRACE(branch[i].bh, "call journal_forget");
+		BUFFER_TRACE(branch[i].bh, "call jbd2_journal_forget");
 		ext4_journal_forget(handle, branch[i].bh);
 	}
 	for (i = 0; i <indirect_blks; i++)
@@ -758,7 +758,7 @@
 
 err_out:
 	for (i = 1; i <= num; i++) {
-		BUFFER_TRACE(where[i].bh, "call journal_forget");
+		BUFFER_TRACE(where[i].bh, "call jbd2_journal_forget");
 		ext4_journal_forget(handle, where[i].bh);
 		ext4_free_blocks(handle,inode,le32_to_cpu(where[i-1].key),1);
 	}
@@ -1119,7 +1119,7 @@
  * To preserve ordering, it is essential that the hole instantiation and
  * the data write be encapsulated in a single transaction.  We cannot
  * close off a transaction and start a new one between the ext4_get_block()
- * and the commit_write().  So doing the journal_start at the start of
+ * and the commit_write().  So doing the jbd2_journal_start at the start of
  * prepare_write() is the right place.
  *
  * Also, this function can nest inside ext4_writepage() ->
@@ -1135,7 +1135,7 @@
  * transaction open and was blocking on the quota lock - a ranking
  * violation.
  *
- * So what we do is to rely on the fact that journal_stop/journal_start
+ * So what we do is to rely on the fact that jbd2_journal_stop/journal_start
  * will _not_ run commit under these circumstances because handle->h_ref
  * is elevated.  We'll still have enough credits for the tiny quotafile
  * write.
@@ -1184,7 +1184,7 @@
 
 int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
 {
-	int err = journal_dirty_data(handle, bh);
+	int err = jbd2_journal_dirty_data(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(__FUNCTION__, __FUNCTION__,
 						bh, handle,err);
@@ -1333,9 +1333,9 @@
 
 		EXT4_I(inode)->i_state &= ~EXT4_STATE_JDATA;
 		journal = EXT4_JOURNAL(inode);
-		journal_lock_updates(journal);
-		err = journal_flush(journal);
-		journal_unlock_updates(journal);
+		jbd2_journal_lock_updates(journal);
+		err = jbd2_journal_flush(journal);
+		jbd2_journal_unlock_updates(journal);
 
 		if (err)
 			return 0;
@@ -1356,7 +1356,7 @@
 	return 0;
 }
 
-static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
+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);
@@ -1464,7 +1464,7 @@
 	 */
 	if (ret == 0) {
 		err = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE,
-					NULL, journal_dirty_data_fn);
+					NULL, jbd2_journal_dirty_data_fn);
 		if (!ret)
 			ret = err;
 	}
@@ -1595,7 +1595,7 @@
 	if (offset == 0)
 		ClearPageChecked(page);
 
-	journal_invalidatepage(journal, page, offset);
+	jbd2_journal_invalidatepage(journal, page, offset);
 }
 
 static int ext4_releasepage(struct page *page, gfp_t wait)
@@ -1605,7 +1605,7 @@
 	WARN_ON(PageChecked(page));
 	if (!page_has_buffers(page))
 		return 0;
-	return journal_try_to_free_buffers(journal, page, wait);
+	return jbd2_journal_try_to_free_buffers(journal, page, wait);
 }
 
 /*
@@ -1982,11 +1982,11 @@
 
 	/*
 	 * Any buffers which are on the journal will be in memory. We find
-	 * them on the hash table so journal_revoke() will run journal_forget()
+	 * them on the hash table so jbd2_journal_revoke() will run jbd2_journal_forget()
 	 * on them.  We've already detached each block from the file, so
-	 * bforget() in journal_forget() should be safe.
+	 * bforget() in jbd2_journal_forget() should be safe.
 	 *
-	 * AKPM: turn on bforget in journal_forget()!!!
+	 * AKPM: turn on bforget in jbd2_journal_forget()!!!
 	 */
 	for (p = first; p < last; p++) {
 		u32 nr = le32_to_cpu(*p);
@@ -2132,11 +2132,11 @@
 			 * We've probably journalled the indirect block several
 			 * times during the truncate.  But it's no longer
 			 * needed and we now drop it from the transaction via
-			 * journal_revoke().
+			 * jbd2_journal_revoke().
 			 *
 			 * That's easy if it's exclusively part of this
 			 * transaction.  But if it's part of the committing
-			 * transaction then journal_forget() will simply
+			 * transaction then jbd2_journal_forget() will simply
 			 * brelse() it.  That means that if the underlying
 			 * block is reallocated in ext4_get_block(),
 			 * unmap_underlying_metadata() will find this block
@@ -2251,7 +2251,7 @@
 
 	/*
 	 * We have to lock the EOF page here, because lock_page() nests
-	 * outside journal_start().
+	 * outside jbd2_journal_start().
 	 */
 	if ((inode->i_size & (blocksize - 1)) == 0) {
 		/* Block boundary? Nothing to do */
@@ -3035,7 +3035,7 @@
 	/* the do_update_inode consumes one bh->b_count */
 	get_bh(iloc->bh);
 
-	/* ext4_do_update_inode() does journal_dirty_metadata */
+	/* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
 	err = ext4_do_update_inode(handle, inode, iloc);
 	put_bh(iloc->bh);
 	return err;
@@ -3153,7 +3153,7 @@
 		err = ext4_get_inode_loc(inode, &iloc);
 		if (!err) {
 			BUFFER_TRACE(iloc.bh, "get_write_access");
-			err = journal_get_write_access(handle, iloc.bh);
+			err = jbd2_journal_get_write_access(handle, iloc.bh);
 			if (!err)
 				err = ext4_journal_dirty_metadata(handle,
 								  iloc.bh);
@@ -3185,8 +3185,8 @@
 	if (is_journal_aborted(journal) || IS_RDONLY(inode))
 		return -EROFS;
 
-	journal_lock_updates(journal);
-	journal_flush(journal);
+	jbd2_journal_lock_updates(journal);
+	jbd2_journal_flush(journal);
 
 	/*
 	 * OK, there are no updates running now, and all cached data is
@@ -3202,7 +3202,7 @@
 		EXT4_I(inode)->i_flags &= ~EXT4_JOURNAL_DATA_FL;
 	ext4_set_aops(inode);
 
-	journal_unlock_updates(journal);
+	jbd2_journal_unlock_updates(journal);
 
 	/* Finally we can mark the inode as dirty. */
 
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index a567af1..a63dce2 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -8,10 +8,10 @@
  */
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/capability.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/time.h>
 #include <linux/compat.h>
 #include <linux/smp_lock.h>
@@ -219,9 +219,9 @@
 			return -EFAULT;
 
 		err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
-		journal_lock_updates(EXT4_SB(sb)->s_journal);
-		journal_flush(EXT4_SB(sb)->s_journal);
-		journal_unlock_updates(EXT4_SB(sb)->s_journal);
+		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+		jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 
 		return err;
 	}
@@ -241,9 +241,9 @@
 			return -EFAULT;
 
 		err = ext4_group_add(sb, &input);
-		journal_lock_updates(EXT4_SB(sb)->s_journal);
-		journal_flush(EXT4_SB(sb)->s_journal);
-		journal_unlock_updates(EXT4_SB(sb)->s_journal);
+		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+		jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 
 		return err;
 	}
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 956b381..f98b999 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -26,10 +26,10 @@
 
 #include <linux/fs.h>
 #include <linux/pagemap.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/time.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/fcntl.h>
 #include <linux/stat.h>
 #include <linux/string.h>
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 4a47895..5b2828d 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -13,7 +13,7 @@
 
 #include <linux/sched.h>
 #include <linux/smp_lock.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 
 #include <linux/errno.h>
 #include <linux/slab.h>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9e32a2a..f131bb6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -20,9 +20,9 @@
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/time.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
@@ -63,7 +63,7 @@
 static void ext4_write_super_lockfs(struct super_block *sb);
 
 /*
- * Wrappers for journal_start/end.
+ * Wrappers for jbd2_journal_start/end.
  *
  * The only special thing we need to do here is to make sure that all
  * journal_end calls result in the superblock being marked dirty, so
@@ -87,12 +87,12 @@
 		return ERR_PTR(-EROFS);
 	}
 
-	return journal_start(journal, nblocks);
+	return jbd2_journal_start(journal, nblocks);
 }
 
 /*
  * The only special thing we need to do here is to make sure that all
- * journal_stop calls result in the superblock being marked dirty, so
+ * jbd2_journal_stop calls result in the superblock being marked dirty, so
  * that sync() will call the filesystem's write_super callback if
  * appropriate.
  */
@@ -104,7 +104,7 @@
 
 	sb = handle->h_transaction->t_journal->j_private;
 	err = handle->h_err;
-	rc = journal_stop(handle);
+	rc = jbd2_journal_stop(handle);
 
 	if (!err)
 		err = rc;
@@ -131,7 +131,7 @@
 	printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 	       caller, errstr, err_fn);
 
-	journal_abort_handle(handle);
+	jbd2_journal_abort_handle(handle);
 }
 
 /* Deal with the reporting of failure conditions on a filesystem such as
@@ -144,7 +144,7 @@
  * be aborted, we can't rely on the current, or future, transactions to
  * write out the superblock safely.
  *
- * We'll just use the journal_abort() error code to record an error in
+ * We'll just use the jbd2_journal_abort() error code to record an error in
  * the journal instead.  On recovery, the journal will compain about
  * that error until we've noted it down and cleared it.
  */
@@ -164,7 +164,7 @@
 
 		EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
 		if (journal)
-			journal_abort(journal, -EIO);
+			jbd2_journal_abort(journal, -EIO);
 	}
 	if (test_opt (sb, ERRORS_RO)) {
 		printk (KERN_CRIT "Remounting filesystem read-only\n");
@@ -203,7 +203,7 @@
 		errstr = "Out of memory";
 		break;
 	case -EROFS:
-		if (!sb || EXT4_SB(sb)->s_journal->j_flags & JFS_ABORT)
+		if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
 			errstr = "Journal has aborted";
 		else
 			errstr = "Readonly filesystem";
@@ -279,7 +279,7 @@
 	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 	sb->s_flags |= MS_RDONLY;
 	EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
-	journal_abort(EXT4_SB(sb)->s_journal, -EIO);
+	jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
 }
 
 void ext4_warning (struct super_block * sb, const char * function,
@@ -391,7 +391,7 @@
 	int i;
 
 	ext4_xattr_put_super(sb);
-	journal_destroy(sbi->s_journal);
+	jbd2_journal_destroy(sbi->s_journal);
 	if (!(sb->s_flags & MS_RDONLY)) {
 		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 		es->s_state = cpu_to_le16(sbi->s_mount_state);
@@ -1722,8 +1722,8 @@
 		/* No mode set, assume a default based on the journal
                    capabilities: ORDERED_DATA if the journal can
                    cope, else JOURNAL_DATA */
-		if (journal_check_available_features
-		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
+		if (jbd2_journal_check_available_features
+		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
 			set_opt(sbi->s_mount_opt, ORDERED_DATA);
 		else
 			set_opt(sbi->s_mount_opt, JOURNAL_DATA);
@@ -1731,8 +1731,8 @@
 
 	case EXT4_MOUNT_ORDERED_DATA:
 	case EXT4_MOUNT_WRITEBACK_DATA:
-		if (!journal_check_available_features
-		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
+		if (!jbd2_journal_check_available_features
+		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
 			printk(KERN_ERR "EXT4-fs: Journal does not support "
 			       "requested data journaling mode\n");
 			goto failed_mount4;
@@ -1749,7 +1749,7 @@
 		}
 	}
 	/*
-	 * The journal_load will have done any necessary log recovery,
+	 * The jbd2_journal_load will have done any necessary log recovery,
 	 * so we can safely mount the rest of the filesystem now.
 	 */
 
@@ -1797,7 +1797,7 @@
 	goto failed_mount;
 
 failed_mount4:
-	journal_destroy(sbi->s_journal);
+	jbd2_journal_destroy(sbi->s_journal);
 failed_mount3:
 	percpu_counter_destroy(&sbi->s_freeblocks_counter);
 	percpu_counter_destroy(&sbi->s_freeinodes_counter);
@@ -1837,9 +1837,9 @@
 
 	spin_lock(&journal->j_state_lock);
 	if (test_opt(sb, BARRIER))
-		journal->j_flags |= JFS_BARRIER;
+		journal->j_flags |= JBD2_BARRIER;
 	else
-		journal->j_flags &= ~JFS_BARRIER;
+		journal->j_flags &= ~JBD2_BARRIER;
 	spin_unlock(&journal->j_state_lock);
 }
 
@@ -1873,7 +1873,7 @@
 		return NULL;
 	}
 
-	journal = journal_init_inode(journal_inode);
+	journal = jbd2_journal_init_inode(journal_inode);
 	if (!journal) {
 		printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
 		iput(journal_inode);
@@ -1945,7 +1945,7 @@
 	start = sb_block + 1;
 	brelse(bh);	/* we're done with the superblock */
 
-	journal = journal_init_dev(bdev, sb->s_bdev,
+	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
 					start, len, blocksize);
 	if (!journal) {
 		printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
@@ -1968,7 +1968,7 @@
 	ext4_init_journal_params(sb, journal);
 	return journal;
 out_journal:
-	journal_destroy(journal);
+	jbd2_journal_destroy(journal);
 out_bdev:
 	ext4_blkdev_put(bdev);
 	return NULL;
@@ -2029,22 +2029,22 @@
 	}
 
 	if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
-		err = journal_update_format(journal);
+		err = jbd2_journal_update_format(journal);
 		if (err)  {
 			printk(KERN_ERR "EXT4-fs: error updating journal.\n");
-			journal_destroy(journal);
+			jbd2_journal_destroy(journal);
 			return err;
 		}
 	}
 
 	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
-		err = journal_wipe(journal, !really_read_only);
+		err = jbd2_journal_wipe(journal, !really_read_only);
 	if (!err)
-		err = journal_load(journal);
+		err = jbd2_journal_load(journal);
 
 	if (err) {
 		printk(KERN_ERR "EXT4-fs: error loading journal.\n");
-		journal_destroy(journal);
+		jbd2_journal_destroy(journal);
 		return err;
 	}
 
@@ -2081,9 +2081,9 @@
 	printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
 	       journal_inum);
 
-	if (journal_create(journal)) {
+	if (jbd2_journal_create(journal)) {
 		printk(KERN_ERR "EXT4-fs: error creating journal.\n");
-		journal_destroy(journal);
+		jbd2_journal_destroy(journal);
 		return -EIO;
 	}
 
@@ -2130,15 +2130,15 @@
 {
 	journal_t *journal = EXT4_SB(sb)->s_journal;
 
-	journal_lock_updates(journal);
-	journal_flush(journal);
+	jbd2_journal_lock_updates(journal);
+	jbd2_journal_flush(journal);
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
 	    sb->s_flags & MS_RDONLY) {
 		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 		sb->s_dirt = 0;
 		ext4_commit_super(sb, es, 1);
 	}
-	journal_unlock_updates(journal);
+	jbd2_journal_unlock_updates(journal);
 }
 
 /*
@@ -2160,7 +2160,7 @@
 	 * journal by a prior ext4_error() or ext4_abort()
 	 */
 
-	j_errno = journal_errno(journal);
+	j_errno = jbd2_journal_errno(journal);
 	if (j_errno) {
 		char nbuf[16];
 
@@ -2174,7 +2174,7 @@
 		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 		ext4_commit_super (sb, es, 1);
 
-		journal_clear_err(journal);
+		jbd2_journal_clear_err(journal);
 	}
 }
 
@@ -2217,9 +2217,9 @@
 	tid_t target;
 
 	sb->s_dirt = 0;
-	if (journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
+	if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
 		if (wait)
-			log_wait_commit(EXT4_SB(sb)->s_journal, target);
+			jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
 	}
 	return 0;
 }
@@ -2236,8 +2236,8 @@
 		journal_t *journal = EXT4_SB(sb)->s_journal;
 
 		/* Now we set up the journal barrier. */
-		journal_lock_updates(journal);
-		journal_flush(journal);
+		jbd2_journal_lock_updates(journal);
+		jbd2_journal_flush(journal);
 
 		/* Journal blocked and flushed, clear needs_recovery flag. */
 		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
@@ -2257,7 +2257,7 @@
 		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 		ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
 		unlock_super(sb);
-		journal_unlock_updates(EXT4_SB(sb)->s_journal);
+		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 	}
 }
 
@@ -2438,9 +2438,9 @@
  * is locked for write. Otherwise the are possible deadlocks:
  * Process 1                         Process 2
  * ext4_create()                     quota_sync()
- *   journal_start()                   write_dquot()
+ *   jbd2_journal_start()                   write_dquot()
  *   DQUOT_INIT()                        down(dqio_mutex)
- *     down(dqio_mutex)                    journal_start()
+ *     down(dqio_mutex)                    jbd2_journal_start()
  *
  */
 
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index 9e4c75f..fcf5272 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -18,7 +18,7 @@
  */
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#include <linux/jbd2.h>
 #include <linux/ext4_fs.h>
 #include <linux/namei.h>
 #include "xattr.h"
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index d3a4081..90f7d5c 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -53,7 +53,7 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/ext4_fs.h>
 #include <linux/mbcache.h>
 #include <linux/quotaops.h>
diff --git a/fs/ext4/xattr_security.c b/fs/ext4/xattr_security.c
index d84b1da..b6a6861 100644
--- a/fs/ext4/xattr_security.c
+++ b/fs/ext4/xattr_security.c
@@ -7,7 +7,7 @@
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/smp_lock.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/ext4_fs.h>
 #include <linux/security.h>
 #include "xattr.h"
diff --git a/fs/ext4/xattr_trusted.c b/fs/ext4/xattr_trusted.c
index 11bd58c..b76f2db 100644
--- a/fs/ext4/xattr_trusted.c
+++ b/fs/ext4/xattr_trusted.c
@@ -10,7 +10,7 @@
 #include <linux/capability.h>
 #include <linux/fs.h>
 #include <linux/smp_lock.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/ext4_fs.h>
 #include "xattr.h"
 
diff --git a/fs/ext4/xattr_user.c b/fs/ext4/xattr_user.c
index 9c5a665..c53cded 100644
--- a/fs/ext4/xattr_user.c
+++ b/fs/ext4/xattr_user.c
@@ -9,7 +9,7 @@
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/smp_lock.h>
-#include <linux/ext4_jbd.h>
+#include <linux/ext4_jbd2.h>
 #include <linux/ext4_fs.h>
 #include "xattr.h"