block: add support for REQ_OP_WRITE_ZEROES

[mirror_ubuntu-bionic-kernel.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7e9d8a0895beb7b47d82a610285920d635f79557..ebeef2b79c5adac3a26c5386e50dc7e2816eb16c 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -323,6 +323,7 @@ struct queue_limits {
        unsigned int            max_discard_sectors;
        unsigned int            max_hw_discard_sectors;
        unsigned int            max_write_same_sectors;
+       unsigned int            max_write_zeroes_sectors;
        unsigned int            discard_granularity;
        unsigned int            discard_alignment;
 
@@ -774,6 +775,9 @@ static inline bool rq_mergeable(struct request *rq)
        if (req_op(rq) == REQ_OP_FLUSH)
                return false;
 
+       if (req_op(rq) == REQ_OP_WRITE_ZEROES)
+               return false;
+
        if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
                return false;
        if (rq->rq_flags & RQF_NOMERGE_FLAGS)
@@ -1004,6 +1008,9 @@ static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
        if (unlikely(op == REQ_OP_WRITE_SAME))
                return q->limits.max_write_same_sectors;
 
+       if (unlikely(op == REQ_OP_WRITE_ZEROES))
+               return q->limits.max_write_zeroes_sectors;
+
        return q->limits.max_sectors;
 }
 
@@ -1107,6 +1114,8 @@ extern void blk_queue_max_discard_sectors(struct request_queue *q,
                unsigned int max_discard_sectors);
 extern void blk_queue_max_write_same_sectors(struct request_queue *q,
                unsigned int max_write_same_sectors);
+extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
+               unsigned int max_write_same_sectors);
 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
 extern void blk_queue_alignment_offset(struct request_queue *q,
@@ -1475,6 +1484,16 @@ static inline unsigned int bdev_write_same(struct block_device *bdev)
        return 0;
 }
 
+static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
+{
+       struct request_queue *q = bdev_get_queue(bdev);
+
+       if (q)
+               return q->limits.max_write_zeroes_sectors;
+
+       return 0;
+}
+
 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
 {
        struct request_queue *q = bdev_get_queue(bdev);