ocfs2: Switch over to JBD2.

ocfs2 wants JBD2 for many reasons, not the least of which is that JBD is
limiting our maximum filesystem size.

It's a pretty trivial change.  Most functions are just renamed.  The
only functional change is moving to Jan's inode-based ordered data mode.
It's better, too.

Because JBD2 reads and writes JBD journals, this is compatible with any
existing filesystem.  It can even interact with JBD-based ocfs2 as long
as the journal is formated for JBD.

We provide a compatibility option so that paranoid people can still use
JBD for the time being.  This will go away shortly.

[ Moved call of ocfs2_begin_ordered_truncate() from ocfs2_delete_inode() to
  ocfs2_truncate_for_delete(). --Mark ]

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

12 files changed, 224 insertions, 81 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index f54a157a0296..4be00d812576 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -220,17 +220,16 @@ config JBD
         tristate
         help
           This is a generic journalling layer for block devices.  It is
-          currently used by the ext3 and OCFS2 file systems, but it could
-          also be used to add journal support to other file systems or block
+          currently used by the ext3 file system, 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 the ext3 or OCFS2 file systems, you need to
-          say Y here. If you are not using ext3 OCFS2 then you will probably
-          want to say N.
+          If you are using the ext3 file system, you need to say Y here.
+          If you are not using ext3 then you will probably want to say N.
 
           To compile this device as a module, choose M here: the module will be
-          called jbd.  If you are compiling ext3 or OCFS2 into the kernel,
-          you cannot compile this code as a module.
+          called jbd.  If you are compiling ext3 into the kernel, you
+          cannot compile this code as a module.
 
 config JBD_DEBUG
         bool "JBD (ext3) debugging support"
@@ -254,15 +253,16 @@ config JBD2
         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 ext4 filesystem, but it could also be used to add
+          the ext4 and OCFS2 filesystems, 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 ext4, you need to say Y here. If you are not
-          using ext4 then you will probably want to say N.
+          If you are using ext4 or OCFS2, you need to say Y here.
+          If you are not using ext4 or OCFS2 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 ext4 into the kernel,
+          called jbd2.  If you are compiling ext4 or OCFS2 into the kernel,
           you cannot compile this code as a module.
 
 config JBD2_DEBUG
@@ -440,7 +440,7 @@ config OCFS2_FS
         tristate "OCFS2 file system support"
         depends on NET && SYSFS
         select CONFIGFS_FS
-        select JBD
+        select JBD2
         select CRC32
         help
           OCFS2 is a general purpose extent based shared disk cluster file
@@ -511,6 +511,16 @@ config OCFS2_DEBUG_FS
           this option for debugging only as it is likely to decrease
           performance of the filesystem.
 
+config OCFS2_COMPAT_JBD
+        bool "Use JBD for compatibility"
+        depends on OCFS2_FS
+        default n
+        select JBD
+        help
+          The ocfs2 filesystem now uses JBD2 for its journalling.  JBD2
+          is backwards compatible with JBD.  It is safe to say N here.
+          However, if you really want to use the original JBD, say Y here.
+
 endif # BLOCK
 
 config DNOTIFY
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 47201b67dbf2..ebfe36ab2d5e 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6421,20 +6421,13 @@ bail:
         return status;
 }
 
-static int ocfs2_writeback_zero_func(handle_t *handle, struct buffer_head *bh)
+static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh)
 {
         set_buffer_uptodate(bh);
         mark_buffer_dirty(bh);
         return 0;
 }
 
-static int ocfs2_ordered_zero_func(handle_t *handle, struct buffer_head *bh)
-{
-        set_buffer_uptodate(bh);
-        mark_buffer_dirty(bh);
-        return ocfs2_journal_dirty_data(handle, bh);
-}
-
 static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
                                      unsigned int from, unsigned int to,
                                      struct page *page, int zero, u64 *phys)
@@ -6453,17 +6446,18 @@ static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
          * here if they aren't - ocfs2_map_page_blocks()
          * might've skipped some
          */
-        if (ocfs2_should_order_data(inode)) {
-                ret = walk_page_buffers(handle,
-                                        page_buffers(page),
-                                        from, to, &partial,
-                                        ocfs2_ordered_zero_func);
-                if (ret < 0)
-                        mlog_errno(ret);
-        } else {
+        ret = walk_page_buffers(handle, page_buffers(page),
+                                from, to, &partial,
+                                ocfs2_zero_func);
+        if (ret < 0)
+                mlog_errno(ret);
+        else if (ocfs2_should_order_data(inode)) {
+                ret = ocfs2_jbd2_file_inode(handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                 ret = walk_page_buffers(handle, page_buffers(page),
                                         from, to, &partial,
-                                        ocfs2_writeback_zero_func);
+                                        ocfs2_journal_dirty_data);
+#endif
                 if (ret < 0)
                         mlog_errno(ret);
         }
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 259775eedb85..de179054a74b 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -485,11 +485,14 @@ handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
         }
 
         if (ocfs2_should_order_data(inode)) {
+                ret = ocfs2_jbd2_file_inode(handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                 ret = walk_page_buffers(handle,
                                         page_buffers(page),
                                         from, to, NULL,
                                         ocfs2_journal_dirty_data);
-                if (ret < 0) 
+#endif
+                if (ret < 0)
                         mlog_errno(ret);
         }
 out:
@@ -669,7 +672,7 @@ static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
 {
         journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
 
-        journal_invalidatepage(journal, page, offset);
+        jbd2_journal_invalidatepage(journal, page, offset);
 }
 
 static int ocfs2_releasepage(struct page *page, gfp_t wait)
@@ -678,7 +681,7 @@ static int ocfs2_releasepage(struct page *page, gfp_t wait)
 
         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);
 }
 
 static ssize_t ocfs2_direct_IO(int rw,
@@ -1074,11 +1077,15 @@ static void ocfs2_write_failure(struct inode *inode,
                 tmppage = wc->w_pages[i];
 
                 if (page_has_buffers(tmppage)) {
-                        if (ocfs2_should_order_data(inode))
+                        if (ocfs2_should_order_data(inode)) {
+                                ocfs2_jbd2_file_inode(wc->w_handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                                 walk_page_buffers(wc->w_handle,
                                                   page_buffers(tmppage),
                                                   from, to, NULL,
                                                   ocfs2_journal_dirty_data);
+#endif
+                        }
 
                         block_commit_write(tmppage, from, to);
                 }
@@ -1917,11 +1924,15 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
                 }
 
                 if (page_has_buffers(tmppage)) {
-                        if (ocfs2_should_order_data(inode))
+                        if (ocfs2_should_order_data(inode)) {
+                                ocfs2_jbd2_file_inode(wc->w_handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                                 walk_page_buffers(wc->w_handle,
                                                   page_buffers(tmppage),
                                                   from, to, NULL,
                                                   ocfs2_journal_dirty_data);
+#endif
+                        }
                         block_commit_write(tmppage, from, to);
                 }
         }
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 441c6a94059d..c95318bc00cb 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -185,7 +185,7 @@ static int ocfs2_sync_file(struct file *file,
                 goto bail;
 
         journal = osb->journal->j_journal;
-        err = journal_force_commit(journal);
+        err = jbd2_journal_force_commit(journal);
 
 bail:
         mlog_exit(err);
@@ -941,9 +941,15 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
                         goto bail_unlock;
                 }
 
-                if (i_size_read(inode) > attr->ia_size)
+                if (i_size_read(inode) > attr->ia_size) {
+                        if (ocfs2_should_order_data(inode)) {
+                                status = ocfs2_begin_ordered_truncate(inode,
+                                                                      attr->ia_size);
+                                if (status)
+                                        goto bail_unlock;
+                        }
                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
-                else
+                } else
                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
                 if (status < 0) {
                         if (status != -ENOSPC)
@@ -1888,7 +1894,7 @@ out_dio:
                  */
                 if (old_size != i_size_read(inode) ||
                     old_clusters != OCFS2_I(inode)->ip_clusters) {
-                        ret = journal_force_commit(osb->journal->j_journal);
+                        ret = jbd2_journal_force_commit(osb->journal->j_journal);
                         if (ret < 0)
                                 written = ret;
                 }
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 4738dd25bb94..9d92c859ac94 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -534,6 +534,9 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
          * data and fast symlinks.
          */
         if (fe->i_clusters) {
+                if (ocfs2_should_order_data(inode))
+                        ocfs2_begin_ordered_truncate(inode, 0);
+
                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
                 if (IS_ERR(handle)) {
                         status = PTR_ERR(handle);
@@ -1100,6 +1103,8 @@ void ocfs2_clear_inode(struct inode *inode)
         oi->ip_last_trans = 0;
         oi->ip_dir_start_lookup = 0;
         oi->ip_blkno = 0ULL;
+        jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
+                                       &oi->ip_jinode);
 
 bail:
         mlog_exit_void();
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 499bc62e758b..f66e4340f178 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -71,6 +71,7 @@ struct ocfs2_inode_info
         struct ocfs2_extent_map         ip_extent_map;
 
         struct inode                    vfs_inode;
+        struct jbd2_inode               ip_jinode;
 };
 
 /*
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index c47bc2a809c2..373d94366a4c 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -215,9 +215,9 @@ static int ocfs2_commit_cache(struct ocfs2_super *osb)
                 goto finally;
         }
 
-        journal_lock_updates(journal->j_journal);
-        status = journal_flush(journal->j_journal);
-        journal_unlock_updates(journal->j_journal);
+        jbd2_journal_lock_updates(journal->j_journal);
+        status = jbd2_journal_flush(journal->j_journal);
+        jbd2_journal_unlock_updates(journal->j_journal);
         if (status < 0) {
                 up_write(&journal->j_trans_barrier);
                 mlog_errno(status);
@@ -264,7 +264,7 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
 
         down_read(&osb->journal->j_trans_barrier);
 
-        handle = journal_start(journal, max_buffs);
+        handle = jbd2_journal_start(journal, max_buffs);
         if (IS_ERR(handle)) {
                 up_read(&osb->journal->j_trans_barrier);
 
@@ -290,7 +290,7 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
 
         BUG_ON(!handle);
 
-        ret = journal_stop(handle);
+        ret = jbd2_journal_stop(handle);
         if (ret < 0)
                 mlog_errno(ret);
 
@@ -304,7 +304,7 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
  * transaction. extend_trans will either extend the current handle by
  * nblocks, or commit it and start a new one with nblocks credits.
  *
- * This might call journal_restart() which will commit dirty buffers
+ * This might call jbd2_journal_restart() which will commit dirty buffers
  * and then restart the transaction. Before calling
  * ocfs2_extend_trans(), any changed blocks should have been
  * dirtied. After calling it, all blocks which need to be changed must
@@ -332,7 +332,7 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
 #ifdef CONFIG_OCFS2_DEBUG_FS
         status = 1;
 #else
-        status = journal_extend(handle, nblocks);
+        status = jbd2_journal_extend(handle, nblocks);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -340,8 +340,10 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
 #endif
 
         if (status > 0) {
-                mlog(0, "journal_extend failed, trying journal_restart\n");
-                status = journal_restart(handle, nblocks);
+                mlog(0,
+                     "jbd2_journal_extend failed, trying "
+                     "jbd2_journal_restart\n");
+                status = jbd2_journal_restart(handle, nblocks);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -393,11 +395,11 @@ int ocfs2_journal_access(handle_t *handle,
         switch (type) {
         case OCFS2_JOURNAL_ACCESS_CREATE:
         case OCFS2_JOURNAL_ACCESS_WRITE:
-                status = journal_get_write_access(handle, bh);
+                status = jbd2_journal_get_write_access(handle, bh);
                 break;
 
         case OCFS2_JOURNAL_ACCESS_UNDO:
-                status = journal_get_undo_access(handle, bh);
+                status = jbd2_journal_get_undo_access(handle, bh);
                 break;
 
         default:
@@ -422,7 +424,7 @@ int ocfs2_journal_dirty(handle_t *handle,
         mlog_entry("(bh->b_blocknr=%llu)\n",
                    (unsigned long long)bh->b_blocknr);
 
-        status = journal_dirty_metadata(handle, bh);
+        status = jbd2_journal_dirty_metadata(handle, bh);
         if (status < 0)
                 mlog(ML_ERROR, "Could not dirty metadata buffer. "
                      "(bh->b_blocknr=%llu)\n",
@@ -432,6 +434,7 @@ int ocfs2_journal_dirty(handle_t *handle,
         return status;
 }
 
+#ifdef CONFIG_OCFS2_COMPAT_JBD
 int ocfs2_journal_dirty_data(handle_t *handle,
                              struct buffer_head *bh)
 {
@@ -443,8 +446,9 @@ int ocfs2_journal_dirty_data(handle_t *handle,
 
         return err;
 }
+#endif
 
-#define OCFS2_DEFAULT_COMMIT_INTERVAL   (HZ * JBD_DEFAULT_MAX_COMMIT_AGE)
+#define OCFS2_DEFAULT_COMMIT_INTERVAL   (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE)
 
 void ocfs2_set_journal_params(struct ocfs2_super *osb)
 {
@@ -457,9 +461,9 @@ void ocfs2_set_journal_params(struct ocfs2_super *osb)
         spin_lock(&journal->j_state_lock);
         journal->j_commit_interval = commit_interval;
         if (osb->s_mount_opt & OCFS2_MOUNT_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);
 }
 
@@ -524,14 +528,14 @@ int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
         mlog(0, "inode->ip_clusters = %u\n", OCFS2_I(inode)->ip_clusters);
 
         /* call the kernels journal init function now */
-        j_journal = journal_init_inode(inode);
+        j_journal = jbd2_journal_init_inode(inode);
         if (j_journal == NULL) {
                 mlog(ML_ERROR, "Linux journal layer error\n");
                 status = -EINVAL;
                 goto done;
         }
 
-        mlog(0, "Returned from journal_init_inode\n");
+        mlog(0, "Returned from jbd2_journal_init_inode\n");
         mlog(0, "j_journal->j_maxlen = %u\n", j_journal->j_maxlen);
 
         *dirty = (le32_to_cpu(di->id1.journal1.ij_flags) &
@@ -639,7 +643,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         if (journal->j_state != OCFS2_JOURNAL_LOADED)
                 goto done;
 
-        /* need to inc inode use count as journal_destroy will iput. */
+        /* need to inc inode use count - jbd2_journal_destroy will iput. */
         if (!igrab(inode))
                 BUG();
 
@@ -668,9 +672,9 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);
 
         if (ocfs2_mount_local(osb)) {
-                journal_lock_updates(journal->j_journal);
-                status = journal_flush(journal->j_journal);
-                journal_unlock_updates(journal->j_journal);
+                jbd2_journal_lock_updates(journal->j_journal);
+                status = jbd2_journal_flush(journal->j_journal);
+                jbd2_journal_unlock_updates(journal->j_journal);
                 if (status < 0)
                         mlog_errno(status);
         }
@@ -686,7 +690,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         }
 
         /* Shutdown the kernel journal system */
-        journal_destroy(journal->j_journal);
+        jbd2_journal_destroy(journal->j_journal);
 
         OCFS2_I(inode)->ip_open_count--;
 
@@ -711,15 +715,15 @@ static void ocfs2_clear_journal_error(struct super_block *sb,
 {
         int olderr;
 
-        olderr = journal_errno(journal);
+        olderr = jbd2_journal_errno(journal);
         if (olderr) {
                 mlog(ML_ERROR, "File system error %d recorded in "
                      "journal %u.\n", olderr, slot);
                 mlog(ML_ERROR, "File system on device %s needs checking.\n",
                      sb->s_id);
 
-                journal_ack_err(journal);
-                journal_clear_err(journal);
+                jbd2_journal_ack_err(journal);
+                jbd2_journal_clear_err(journal);
         }
 }
 
@@ -734,7 +738,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
 
         osb = journal->j_osb;
 
-        status = journal_load(journal->j_journal);
+        status = jbd2_journal_load(journal->j_journal);
         if (status < 0) {
                 mlog(ML_ERROR, "Failed to load journal!\n");
                 goto done;
@@ -778,7 +782,7 @@ int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full)
 
         BUG_ON(!journal);
 
-        status = journal_wipe(journal->j_journal, full);
+        status = jbd2_journal_wipe(journal->j_journal, full);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -1229,19 +1233,19 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
         }
 
         mlog(0, "calling journal_init_inode\n");
-        journal = journal_init_inode(inode);
+        journal = jbd2_journal_init_inode(inode);
         if (journal == NULL) {
                 mlog(ML_ERROR, "Linux journal layer error\n");
                 status = -EIO;
                 goto done;
         }
 
-        status = journal_load(journal);
+        status = jbd2_journal_load(journal);
         if (status < 0) {
                 mlog_errno(status);
                 if (!igrab(inode))
                         BUG();
-                journal_destroy(journal);
+                jbd2_journal_destroy(journal);
                 goto done;
         }
 
@@ -1249,9 +1253,9 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
 
         /* wipe the journal */
         mlog(0, "flushing the journal.\n");
-        journal_lock_updates(journal);
-        status = journal_flush(journal);
-        journal_unlock_updates(journal);
+        jbd2_journal_lock_updates(journal);
+        status = jbd2_journal_flush(journal);
+        jbd2_journal_unlock_updates(journal);
         if (status < 0)
                 mlog_errno(status);
 
@@ -1272,7 +1276,7 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
         if (!igrab(inode))
                 BUG();
 
-        journal_destroy(journal);
+        jbd2_journal_destroy(journal);
 
 done:
         /* drop the lock on this nodes journal */
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 08d1add14872..d4d14e9a3cea 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -27,7 +27,12 @@
 #define OCFS2_JOURNAL_H
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+# include "ocfs2_jbd_compat.h"
+#endif
 
 enum ocfs2_journal_state {
         OCFS2_JOURNAL_FREE = 0,
@@ -215,8 +220,8 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
  *                          buffer. Will have to call ocfs2_journal_dirty once
  *                          we've actually dirtied it. Type is one of . or .
  *  ocfs2_journal_dirty    - Mark a journalled buffer as having dirty data.
- *  ocfs2_journal_dirty_data - Indicate that a data buffer should go out before
- *                             the current handle commits.
+ *  ocfs2_jbd2_file_inode  - Mark an inode so that its data goes out before
+ *                           the current handle commits.
  */
 
 /* You must always start_trans with a number of buffs > 0, but it's
@@ -268,8 +273,10 @@ int                  ocfs2_journal_access(handle_t *handle,
  */
 int                  ocfs2_journal_dirty(handle_t *handle,
                                          struct buffer_head *bh);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
 int                  ocfs2_journal_dirty_data(handle_t *handle,
                                               struct buffer_head *bh);
+#endif
 
 /*
  *  Credit Macros:
@@ -430,4 +437,16 @@ static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb,
         return credits;
 }
 
+static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
+{
+        return jbd2_journal_file_inode(handle, &OCFS2_I(inode)->ip_jinode);
+}
+
+static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
+                                               loff_t new_size)
+{
+        return jbd2_journal_begin_ordered_truncate(&OCFS2_I(inode)->ip_jinode,
+                                                   new_size);
+}
+
 #endif /* OCFS2_JOURNAL_H */
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 78ae4f87e6b0..a21a465490c4 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -34,7 +34,12 @@
 #include <linux/workqueue.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+# include "ocfs2_jbd_compat.h"
+#endif
 
 /* For union ocfs2_dlm_lksb */
 #include "stackglue.h"
diff --git a/fs/ocfs2/ocfs2_jbd_compat.h b/fs/ocfs2/ocfs2_jbd_compat.h
new file mode 100644
index 000000000000..b91c78f8f558
--- /dev/null
+++ b/fs/ocfs2/ocfs2_jbd_compat.h
@@ -0,0 +1,82 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2_jbd_compat.h
+ *
+ * Compatibility defines for JBD.
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef OCFS2_JBD_COMPAT_H
+#define OCFS2_JBD_COMPAT_H
+
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# error Should not have been included
+#endif
+
+struct jbd2_inode {
+        unsigned int dummy;
+};
+
+#define JBD2_BARRIER                    JFS_BARRIER
+#define JBD2_DEFAULT_MAX_COMMIT_AGE     JBD_DEFAULT_MAX_COMMIT_AGE
+
+#define jbd2_journal_ack_err                    journal_ack_err
+#define jbd2_journal_clear_err                  journal_clear_err
+#define jbd2_journal_destroy                    journal_destroy
+#define jbd2_journal_dirty_metadata             journal_dirty_metadata
+#define jbd2_journal_errno                      journal_errno
+#define jbd2_journal_extend                     journal_extend
+#define jbd2_journal_flush                      journal_flush
+#define jbd2_journal_force_commit               journal_force_commit
+#define jbd2_journal_get_write_access           journal_get_write_access
+#define jbd2_journal_get_undo_access            journal_get_undo_access
+#define jbd2_journal_init_inode                 journal_init_inode
+#define jbd2_journal_invalidatepage             journal_invalidatepage
+#define jbd2_journal_load                       journal_load
+#define jbd2_journal_lock_updates               journal_lock_updates
+#define jbd2_journal_restart                    journal_restart
+#define jbd2_journal_start                      journal_start
+#define jbd2_journal_start_commit               journal_start_commit
+#define jbd2_journal_stop                       journal_stop
+#define jbd2_journal_try_to_free_buffers        journal_try_to_free_buffers
+#define jbd2_journal_unlock_updates             journal_unlock_updates
+#define jbd2_journal_wipe                       journal_wipe
+#define jbd2_log_wait_commit                    log_wait_commit
+
+static inline int jbd2_journal_file_inode(handle_t *handle,
+                                          struct jbd2_inode *inode)
+{
+        return 0;
+}
+
+static inline int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode,
+                                                      loff_t new_size)
+{
+        return 0;
+}
+
+static inline void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode,
+                                               struct inode *inode)
+{
+        return;
+}
+
+static inline void jbd2_journal_release_jbd_inode(journal_t *journal,
+                                                  struct jbd2_inode *jinode)
+{
+        return;
+}
+
+
+#endif  /* OCFS2_JBD_COMPAT_H */
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 1a51c8c53bef..8b4c5c67dcd4 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -212,10 +212,11 @@ static int ocfs2_sync_fs(struct super_block *sb, int wait)
                 ocfs2_schedule_truncate_log_flush(osb, 0);
         }
 
-        if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
+        if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
+                                      &target)) {
                 if (wait)
-                        log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
-                                        target);
+                        jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
+                                             target);
         }
         return 0;
 }
@@ -332,6 +333,7 @@ static struct inode *ocfs2_alloc_inode(struct super_block *sb)
         if (!oi)
                 return NULL;
 
+        jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
         return &oi->vfs_inode;
 }
 
@@ -896,7 +898,7 @@ static int ocfs2_parse_options(struct super_block *sb,
                         if (option < 0)
                                 return 0;
                         if (option == 0)
-                                option = JBD_DEFAULT_MAX_COMMIT_AGE;
+                                option = JBD2_DEFAULT_MAX_COMMIT_AGE;
                         mopt->commit_interval = HZ * option;
                         break;
                 case Opt_localalloc:
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
index e26459e7d554..523514020891 100644
--- a/fs/ocfs2/uptodate.c
+++ b/fs/ocfs2/uptodate.c
@@ -53,7 +53,11 @@
 #include <linux/highmem.h>
 #include <linux/buffer_head.h>
 #include <linux/rbtree.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+#endif
 
 #define MLOG_MASK_PREFIX ML_UPTODATE