Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[safe/jmp/linux-2.6] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f62d45e..5c80189 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -311,13 +311,18 @@ struct queue_limits {
        unsigned int            alignment_offset;
        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
@@ -748,6 +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);
@@ -822,19 +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
@@ -842,7 +845,6 @@ static inline void blk_run_address_space(struct address_space *mapping)
  * blk_rq_err_bytes()          : bytes left till the next error boundary
  * blk_rq_sectors()            : sectors left in the entire request
  * blk_rq_cur_sectors()                : sectors left in the current segment
- * blk_rq_err_sectors()                : sectors left till the next error boundary
  */
 static inline sector_t blk_rq_pos(const struct request *rq)
 {
@@ -871,11 +873,6 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
        return blk_rq_cur_bytes(rq) >> 9;
 }
 
-static inline unsigned int blk_rq_err_sectors(const struct request *rq)
-{
-       return blk_rq_err_bytes(rq) >> 9;
-}
-
 /*
  * Request issue related functions.
  */
@@ -928,6 +925,8 @@ extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
 extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short);
 extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
+extern void blk_queue_max_discard_sectors(struct request_queue *q,
+               unsigned int max_discard_sectors);
 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
 extern void blk_queue_physical_block_size(struct request_queue *, unsigned short);
 extern void blk_queue_alignment_offset(struct request_queue *q,
@@ -939,6 +938,8 @@ extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
 extern void blk_set_default_limits(struct queue_limits *lim);
 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
                            sector_t offset);
+extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
+                           sector_t offset);
 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
                              sector_t offset);
 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
@@ -1078,32 +1079,95 @@ static inline unsigned int queue_physical_block_size(struct request_queue *q)
        return q->limits.physical_block_size;
 }
 
+static inline int bdev_physical_block_size(struct block_device *bdev)
+{
+       return queue_physical_block_size(bdev_get_queue(bdev));
+}
+
 static inline unsigned int queue_io_min(struct request_queue *q)
 {
        return q->limits.io_min;
 }
 
+static inline int bdev_io_min(struct block_device *bdev)
+{
+       return queue_io_min(bdev_get_queue(bdev));
+}
+
 static inline unsigned int queue_io_opt(struct request_queue *q)
 {
        return q->limits.io_opt;
 }
 
+static inline int bdev_io_opt(struct block_device *bdev)
+{
+       return queue_io_opt(bdev_get_queue(bdev));
+}
+
 static inline int queue_alignment_offset(struct request_queue *q)
 {
-       if (q && q->limits.misaligned)
+       if (q->limits.misaligned)
                return -1;
 
-       if (q && q->limits.alignment_offset)
-               return q->limits.alignment_offset;
+       return q->limits.alignment_offset;
+}
 
-       return 0;
+static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t offset)
+{
+       unsigned int granularity = max(lim->physical_block_size, lim->io_min);
+
+       offset &= granularity - 1;
+       return (granularity + lim->alignment_offset - offset) & (granularity - 1);
 }
 
 static inline int queue_sector_alignment_offset(struct request_queue *q,
                                                sector_t sector)
 {
-       return ((sector << 9) - q->limits.alignment_offset)
-               & (q->limits.io_min - 1);
+       return queue_limit_alignment_offset(&q->limits, sector << 9);
+}
+
+static inline int bdev_alignment_offset(struct block_device *bdev)
+{
+       struct request_queue *q = bdev_get_queue(bdev);
+
+       if (q->limits.misaligned)
+               return -1;
+
+       if (bdev != bdev->bd_contains)
+               return bdev->bd_part->alignment_offset;
+
+       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)
+{
+       struct queue_limits *lim = &q->limits;
+       unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
+
+       return (lim->discard_granularity + lim->discard_alignment - alignment)
+               & (lim->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)