xfs: enable the xfs_defer mechanism to process rmaps to update

Connect the xfs_defer mechanism with the pieces that we'll need to
handle deferred rmap updates.  We'll wire up the existing code to
our new deferred mechanism later.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

4 files changed, 134 insertions, 10 deletions

diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index b9b5a92ffa6c..cc3981c48296 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -51,6 +51,7 @@ struct xfs_defer_pending {
  * find all the space it needs.
  */
 enum xfs_defer_ops_type {
+        XFS_DEFER_OPS_TYPE_RMAP,
         XFS_DEFER_OPS_TYPE_FREE,
         XFS_DEFER_OPS_TYPE_MAX,
 };
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 654a0924b3d3..9f8090951f09 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1876,6 +1876,7 @@ init_xfs_fs(void)
                          XFS_BUILD_OPTIONS " enabled\n");
 
         xfs_extent_free_init_defer_op();
+        xfs_rmap_update_init_defer_op();
 
         xfs_dir_startup();
 
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 02265817f016..07f4550825f6 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -33,6 +33,8 @@ struct xfs_trans;
 struct xfs_trans_res;
 struct xfs_dquot_acct;
 struct xfs_busy_extent;
+struct xfs_rud_log_item;
+struct xfs_rui_log_item;
 
 typedef struct xfs_log_item {
         struct list_head                li_ail;         /* AIL pointers */
@@ -233,15 +235,10 @@ void		xfs_trans_buf_copy_type(struct xfs_buf *dst_bp,
 extern kmem_zone_t      *xfs_trans_zone;
 extern kmem_zone_t      *xfs_log_item_desc_zone;
 
+/* rmap updates */
 enum xfs_rmap_intent_type;
 
-struct xfs_rui_log_item *xfs_trans_get_rui(struct xfs_trans *tp, uint nextents);
-void xfs_trans_log_start_rmap_update(struct xfs_trans *tp,
-                struct xfs_rui_log_item *ruip, enum xfs_rmap_intent_type type,
-                __uint64_t owner, int whichfork, xfs_fileoff_t startoff,
-                xfs_fsblock_t startblock, xfs_filblks_t blockcount,
-                xfs_exntst_t state);
-
+void xfs_rmap_update_init_defer_op(void);
 struct xfs_rud_log_item *xfs_trans_get_rud(struct xfs_trans *tp,
                 struct xfs_rui_log_item *ruip, uint nextents);
 int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp,
diff --git a/fs/xfs/xfs_trans_rmap.c b/fs/xfs/xfs_trans_rmap.c
index e3a5172ad0c0..baab99077f77 100644
--- a/fs/xfs/xfs_trans_rmap.c
+++ b/fs/xfs/xfs_trans_rmap.c
@@ -37,7 +37,7 @@
  * caller must use all nextents extents, because we are not
  * flexible about this at all.
  */
-struct xfs_rui_log_item *
+STATIC struct xfs_rui_log_item *
 xfs_trans_get_rui(
         struct xfs_trans                *tp,
         uint                            nextents)
@@ -96,7 +96,7 @@ xfs_trans_set_rmap_flags(
  * mapping is to be logged as needing to be updated.  It should be
  * called once for each mapping.
  */
-void
+STATIC void
 xfs_trans_log_start_rmap_update(
         struct xfs_trans                *tp,
         struct xfs_rui_log_item         *ruip,
@@ -129,7 +129,6 @@ xfs_trans_log_start_rmap_update(
         xfs_trans_set_rmap_flags(rmap, type, whichfork, state);
 }
 
-
 /*
  * This routine is called to allocate an "rmap update done"
  * log item that will hold nextents worth of extents.  The
@@ -203,3 +202,129 @@ xfs_trans_log_finish_rmap_update(
 
         return error;
 }
+
+/* Sort rmap intents by AG. */
+static int
+xfs_rmap_update_diff_items(
+        void                            *priv,
+        struct list_head                *a,
+        struct list_head                *b)
+{
+        struct xfs_mount                *mp = priv;
+        struct xfs_rmap_intent          *ra;
+        struct xfs_rmap_intent          *rb;
+
+        ra = container_of(a, struct xfs_rmap_intent, ri_list);
+        rb = container_of(b, struct xfs_rmap_intent, ri_list);
+        return  XFS_FSB_TO_AGNO(mp, ra->ri_bmap.br_startblock) -
+                XFS_FSB_TO_AGNO(mp, rb->ri_bmap.br_startblock);
+}
+
+/* Get an RUI. */
+STATIC void *
+xfs_rmap_update_create_intent(
+        struct xfs_trans                *tp,
+        unsigned int                    count)
+{
+        return xfs_trans_get_rui(tp, count);
+}
+
+/* Log rmap updates in the intent item. */
+STATIC void
+xfs_rmap_update_log_item(
+        struct xfs_trans                *tp,
+        void                            *intent,
+        struct list_head                *item)
+{
+        struct xfs_rmap_intent          *rmap;
+
+        rmap = container_of(item, struct xfs_rmap_intent, ri_list);
+        xfs_trans_log_start_rmap_update(tp, intent, rmap->ri_type,
+                        rmap->ri_owner, rmap->ri_whichfork,
+                        rmap->ri_bmap.br_startoff,
+                        rmap->ri_bmap.br_startblock,
+                        rmap->ri_bmap.br_blockcount,
+                        rmap->ri_bmap.br_state);
+}
+
+/* Get an RUD so we can process all the deferred rmap updates. */
+STATIC void *
+xfs_rmap_update_create_done(
+        struct xfs_trans                *tp,
+        void                            *intent,
+        unsigned int                    count)
+{
+        return xfs_trans_get_rud(tp, intent, count);
+}
+
+/* Process a deferred rmap update. */
+STATIC int
+xfs_rmap_update_finish_item(
+        struct xfs_trans                *tp,
+        struct xfs_defer_ops            *dop,
+        struct list_head                *item,
+        void                            *done_item,
+        void                            **state)
+{
+        struct xfs_rmap_intent          *rmap;
+        int                             error;
+
+        rmap = container_of(item, struct xfs_rmap_intent, ri_list);
+        error = xfs_trans_log_finish_rmap_update(tp, done_item,
+                        rmap->ri_type,
+                        rmap->ri_owner, rmap->ri_whichfork,
+                        rmap->ri_bmap.br_startoff,
+                        rmap->ri_bmap.br_startblock,
+                        rmap->ri_bmap.br_blockcount,
+                        rmap->ri_bmap.br_state);
+        kmem_free(rmap);
+        return error;
+}
+
+/* Clean up after processing deferred rmaps. */
+STATIC void
+xfs_rmap_update_finish_cleanup(
+        struct xfs_trans        *tp,
+        void                    *state,
+        int                     error)
+{
+}
+
+/* Abort all pending RUIs. */
+STATIC void
+xfs_rmap_update_abort_intent(
+        void                            *intent)
+{
+        xfs_rui_release(intent);
+}
+
+/* Cancel a deferred rmap update. */
+STATIC void
+xfs_rmap_update_cancel_item(
+        struct list_head                *item)
+{
+        struct xfs_rmap_intent          *rmap;
+
+        rmap = container_of(item, struct xfs_rmap_intent, ri_list);
+        kmem_free(rmap);
+}
+
+static const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
+        .type           = XFS_DEFER_OPS_TYPE_RMAP,
+        .max_items      = XFS_RUI_MAX_FAST_EXTENTS,
+        .diff_items     = xfs_rmap_update_diff_items,
+        .create_intent  = xfs_rmap_update_create_intent,
+        .abort_intent   = xfs_rmap_update_abort_intent,
+        .log_item       = xfs_rmap_update_log_item,
+        .create_done    = xfs_rmap_update_create_done,
+        .finish_item    = xfs_rmap_update_finish_item,
+        .finish_cleanup = xfs_rmap_update_finish_cleanup,
+        .cancel_item    = xfs_rmap_update_cancel_item,
+};
+
+/* Register the deferred op type. */
+void
+xfs_rmap_update_init_defer_op(void)
+{
+        xfs_defer_init_op_type(&xfs_rmap_update_defer_type);
+}