1 files changed, 43 insertions, 13 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 221cecd86bd3..784a919aa0d0 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -312,13 +312,17 @@ struct queue_limits {
         unsigned int            io_min;
         unsigned int            io_opt;
         unsigned int            max_discard_sectors;
+        unsigned int            discard_granularity;
+        unsigned int            discard_alignment;
 
         unsigned short          logical_block_size;
         unsigned short          max_hw_segments;
         unsigned short          max_phys_segments;
 
         unsigned char           misaligned;
+        unsigned char           discard_misaligned;
         unsigned char           no_cluster;
+        signed char             discard_zeroes_data;
 };
 
 struct request_queue
@@ -749,6 +753,17 @@ struct req_iterator {
 #define rq_iter_last(rq, _iter)                                 \
                 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1)
 
+#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
+# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
+#endif
+#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
+extern void rq_flush_dcache_pages(struct request *rq);
+#else
+static inline void rq_flush_dcache_pages(struct request *rq)
+{
+}
+#endif
+
 extern int blk_register_queue(struct gendisk *disk);
 extern void blk_unregister_queue(struct gendisk *disk);
 extern void register_disk(struct gendisk *dev);
@@ -823,19 +838,6 @@ static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
         return bdev->bd_disk->queue;
 }
 
-static inline void blk_run_backing_dev(struct backing_dev_info *bdi,
-                                       struct page *page)
-{
-        if (bdi && bdi->unplug_io_fn)
-                bdi->unplug_io_fn(bdi, page);
-}
-
-static inline void blk_run_address_space(struct address_space *mapping)
-{
-        if (mapping)
-                blk_run_backing_dev(mapping->backing_dev_info, NULL);
-}
-
 /*
  * blk_rq_pos()                 : the current sector
  * blk_rq_bytes()               : bytes left in the entire request
@@ -1134,6 +1136,34 @@ static inline int bdev_alignment_offset(struct block_device *bdev)
         return q->limits.alignment_offset;
 }
 
+static inline int queue_discard_alignment(struct request_queue *q)
+{
+        if (q->limits.discard_misaligned)
+                return -1;
+
+        return q->limits.discard_alignment;
+}
+
+static inline int queue_sector_discard_alignment(struct request_queue *q,
+                                                 sector_t sector)
+{
+        return ((sector << 9) - q->limits.discard_alignment)
+                & (q->limits.discard_granularity - 1);
+}
+
+static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
+{
+        if (q->limits.discard_zeroes_data == 1)
+                return 1;
+
+        return 0;
+}
+
+static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
+{
+        return queue_discard_zeroes_data(bdev_get_queue(bdev));
+}
+
 static inline int queue_dma_alignment(struct request_queue *q)
 {
         return q ? q->dma_alignment : 511;