14 files changed, 81 insertions, 54 deletions

diff --git a/drivers/md/dm-log-userspace-base.c b/drivers/md/dm-log-userspace-base.c
index 7ac2c1450d10..1ed0094f064b 100644
--- a/drivers/md/dm-log-userspace-base.c
+++ b/drivers/md/dm-log-userspace-base.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/bio.h>
+#include <linux/slab.h>
 #include <linux/dm-dirty-log.h>
 #include <linux/device-mapper.h>
 #include <linux/dm-log-userspace.h>
diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index f1c8cae70b4b..075cbcf8a9f5 100644
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -6,6 +6,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <net/sock.h>
 #include <linux/workqueue.h>
 #include <linux/connector.h>
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index 168bd38f5006..bd5c58b28868 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -11,6 +11,7 @@
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/vmalloc.h>
 
 #include "dm.h"
diff --git a/drivers/md/dm-service-time.c b/drivers/md/dm-service-time.c
index cfa668f46c40..9c6c2e47ad62 100644
--- a/drivers/md/dm-service-time.c
+++ b/drivers/md/dm-service-time.c
@@ -11,6 +11,8 @@
 #include "dm.h"
 #include "dm-path-selector.h"
 
+#include <linux/slab.h>
+
 #define DM_MSG_PREFIX   "multipath service-time"
 #define ST_MIN_IO       1
 #define ST_MAX_RELATIVE_THROUGHPUT      100
diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 04feccf2a997..11dea11dc0b6 100644
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -10,7 +10,6 @@
 #include <linux/init.h>
 #include <linux/kmod.h>
 #include <linux/bio.h>
-#include <linux/slab.h>
 
 #define DM_MSG_PREFIX "target"
 
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index 713acd02ab39..8e3850b98cca 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -64,6 +64,7 @@
 #define MaxFault        50
 #include <linux/blkdev.h>
 #include <linux/raid/md_u.h>
+#include <linux/slab.h>
 #include "md.h"
 #include <linux/seq_file.h>
 
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index af2d39d603c7..09437e958235 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -19,6 +19,7 @@
 #include <linux/blkdev.h>
 #include <linux/raid/md_u.h>
 #include <linux/seq_file.h>
+#include <linux/slab.h>
 #include "md.h"
 #include "linear.h"
 
@@ -172,12 +173,14 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
                 disk_stack_limits(mddev->gendisk, rdev->bdev,
                                   rdev->data_offset << 9);
                 /* as we don't honour merge_bvec_fn, we must never risk
-                 * violating it, so limit ->max_sector to one PAGE, as
-                 * a one page request is never in violation.
+                 * violating it, so limit max_segments to 1 lying within
+                 * a single page.
                  */
-                if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                        blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                        blk_queue_max_segments(mddev->queue, 1);
+                        blk_queue_segment_boundary(mddev->queue,
+                                                   PAGE_CACHE_SIZE - 1);
+                }
 
                 conf->array_sectors += rdev->sectors;
                 cnt++;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index fdc1890b6ac5..9712b2e97be4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -49,6 +49,7 @@
 #include <linux/delay.h>
 #include <linux/raid/md_p.h>
 #include <linux/raid/md_u.h>
+#include <linux/slab.h>
 #include "md.h"
 #include "bitmap.h"
 
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 4b323f45ad74..789bf535d29c 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -22,6 +22,7 @@
 #include <linux/blkdev.h>
 #include <linux/raid/md_u.h>
 #include <linux/seq_file.h>
+#include <linux/slab.h>
 #include "md.h"
 #include "multipath.h"
 
@@ -301,14 +302,16 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                                           rdev->data_offset << 9);
 
                 /* as we don't honour merge_bvec_fn, we must never risk
-                 * violating it, so limit ->max_sector to one PAGE, as
-                 * a one page request is never in violation.
+                 * violating it, so limit ->max_segments to one, lying
+                 * within a single page.
                  * (Note: it is very unlikely that a device with
                  * merge_bvec_fn will be involved in multipath.)
                  */
-                        if (q->merge_bvec_fn &&
-                            queue_max_sectors(q) > (PAGE_SIZE>>9))
-                                blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                        if (q->merge_bvec_fn) {
+                                blk_queue_max_segments(mddev->queue, 1);
+                                blk_queue_segment_boundary(mddev->queue,
+                                                           PAGE_CACHE_SIZE - 1);
+                        }
 
                         conf->working_disks++;
                         mddev->degraded--;
@@ -476,9 +479,11 @@ static int multipath_run (mddev_t *mddev)
                 /* as we don't honour merge_bvec_fn, we must never risk
                  * violating it, not that we ever expect a device with
                  * a merge_bvec_fn to be involved in multipath */
-                if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                        blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                        blk_queue_max_segments(mddev->queue, 1);
+                        blk_queue_segment_boundary(mddev->queue,
+                                                   PAGE_CACHE_SIZE - 1);
+                }
 
                 if (!test_bit(Faulty, &rdev->flags))
                         conf->working_disks++;
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index a1f7147b757f..c3bec024612e 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -20,6 +20,7 @@
 
 #include <linux/blkdev.h>
 #include <linux/seq_file.h>
+#include <linux/slab.h>
 #include "md.h"
 #include "raid0.h"
 
@@ -176,14 +177,15 @@ static int create_strip_zones(mddev_t *mddev)
                 disk_stack_limits(mddev->gendisk, rdev1->bdev,
                                   rdev1->data_offset << 9);
                 /* as we don't honour merge_bvec_fn, we must never risk
-                 * violating it, so limit ->max_sector to one PAGE, as
-                 * a one page request is never in violation.
+                 * violating it, so limit ->max_segments to 1, lying within
+                 * a single page.
                  */
 
-                if (rdev1->bdev->bd_disk->queue->merge_bvec_fn &&
-                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                        blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
-
+                if (rdev1->bdev->bd_disk->queue->merge_bvec_fn) {
+                        blk_queue_max_segments(mddev->queue, 1);
+                        blk_queue_segment_boundary(mddev->queue,
+                                                   PAGE_CACHE_SIZE - 1);
+                }
                 if (!smallest || (rdev1->sectors < smallest->sectors))
                         smallest = rdev1;
                 cnt++;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 5a06122abd3b..e59b10e66edb 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -31,6 +31,7 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/blkdev.h>
 #include <linux/seq_file.h>
@@ -1152,13 +1153,17 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
 
                         disk_stack_limits(mddev->gendisk, rdev->bdev,
                                           rdev->data_offset << 9);
-                        /* as we don't honour merge_bvec_fn, we must never risk
-                         * violating it, so limit ->max_sector to one PAGE, as
-                         * a one page request is never in violation.
+                        /* as we don't honour merge_bvec_fn, we must
+                         * never risk violating it, so limit
+                         * ->max_segments to one lying with a single
+                         * page, as a one page request is never in
+                         * violation.
                          */
-                        if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                            queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                                blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                        if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                                blk_queue_max_segments(mddev->queue, 1);
+                                blk_queue_segment_boundary(mddev->queue,
+                                                           PAGE_CACHE_SIZE - 1);
+                        }
 
                         p->head_position = 0;
                         rdev->raid_disk = mirror;
@@ -2098,12 +2103,14 @@ static int run(mddev_t *mddev)
                 disk_stack_limits(mddev->gendisk, rdev->bdev,
                                   rdev->data_offset << 9);
                 /* as we don't honour merge_bvec_fn, we must never risk
-                 * violating it, so limit ->max_sector to one PAGE, as
-                 * a one page request is never in violation.
+                 * violating it, so limit ->max_segments to 1 lying within
+                 * a single page, as a one page request is never in violation.
                  */
-                if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                        blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                        blk_queue_max_segments(mddev->queue, 1);
+                        blk_queue_segment_boundary(mddev->queue,
+                                                   PAGE_CACHE_SIZE - 1);
+                }
         }
 
         mddev->degraded = 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7584f9ab9bcf..e2766d8251a1 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -18,6 +18,7 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/blkdev.h>
 #include <linux/seq_file.h>
@@ -1155,13 +1156,17 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
 
                         disk_stack_limits(mddev->gendisk, rdev->bdev,
                                           rdev->data_offset << 9);
-                        /* as we don't honour merge_bvec_fn, we must never risk
-                         * violating it, so limit ->max_sector to one PAGE, as
-                         * a one page request is never in violation.
+                        /* as we don't honour merge_bvec_fn, we must
+                         * never risk violating it, so limit
+                         * ->max_segments to one lying with a single
+                         * page, as a one page request is never in
+                         * violation.
                          */
-                        if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                            queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                                blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                        if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                                blk_queue_max_segments(mddev->queue, 1);
+                                blk_queue_segment_boundary(mddev->queue,
+                                                           PAGE_CACHE_SIZE - 1);
+                        }
 
                         p->head_position = 0;
                         rdev->raid_disk = mirror;
@@ -2255,12 +2260,14 @@ static int run(mddev_t *mddev)
                 disk_stack_limits(mddev->gendisk, rdev->bdev,
                                   rdev->data_offset << 9);
                 /* as we don't honour merge_bvec_fn, we must never risk
-                 * violating it, so limit ->max_sector to one PAGE, as
-                 * a one page request is never in violation.
+                 * violating it, so limit max_segments to 1 lying
+                 * within a single page.
                  */
-                if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                        blk_queue_max_hw_sectors(mddev->queue, PAGE_SIZE>>9);
+                if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+                        blk_queue_max_segments(mddev->queue, 1);
+                        blk_queue_segment_boundary(mddev->queue,
+                                                   PAGE_CACHE_SIZE - 1);
+                }
 
                 disk->head_position = 0;
         }
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 70ffbd071b2e..20e48401910e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -50,6 +50,7 @@
 #include <linux/async.h>
 #include <linux/seq_file.h>
 #include <linux/cpu.h>
+#include <linux/slab.h>
 #include "md.h"
 #include "raid5.h"
 #include "bitmap.h"
@@ -1649,8 +1650,8 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
                                      int previous, int *dd_idx,
                                      struct stripe_head *sh)
 {
-        long stripe;
-        unsigned long chunk_number;
+        sector_t stripe;
+        sector_t chunk_number;
         unsigned int chunk_offset;
         int pd_idx, qd_idx;
         int ddf_layout = 0;
@@ -1670,17 +1671,12 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
          */
         chunk_offset = sector_div(r_sector, sectors_per_chunk);
         chunk_number = r_sector;
-        BUG_ON(r_sector != chunk_number);
 
         /*
          * Compute the stripe number
          */
-        stripe = chunk_number / data_disks;
-
-        /*
-         * Compute the data disk and parity disk indexes inside the stripe
-         */
-        *dd_idx = chunk_number % data_disks;
+        stripe = chunk_number;
+        *dd_idx = sector_div(stripe, data_disks);
 
         /*
          * Select the parity disk based on the user selected algorithm.
@@ -1869,14 +1865,14 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
                                  : conf->algorithm;
         sector_t stripe;
         int chunk_offset;
-        int chunk_number, dummy1, dd_idx = i;
+        sector_t chunk_number;
+        int dummy1, dd_idx = i;
         sector_t r_sector;
         struct stripe_head sh2;
 
 
         chunk_offset = sector_div(new_sector, sectors_per_chunk);
         stripe = new_sector;
-        BUG_ON(new_sector != stripe);
 
         if (i == sh->pd_idx)
                 return 0;
@@ -1969,7 +1965,7 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
         }
 
         chunk_number = stripe * data_disks + i;
-        r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset;
+        r_sector = chunk_number * sectors_per_chunk + chunk_offset;
 
         check = raid5_compute_sector(conf, r_sector,
                                      previous, &dummy1, &sh2);
diff --git a/drivers/md/raid6algos.c b/drivers/md/raid6algos.c
index bffc61bff5ab..1f8784bfd44d 100644
--- a/drivers/md/raid6algos.c
+++ b/drivers/md/raid6algos.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/raid/pq.h>
+#include <linux/gfp.h>
 #ifndef __KERNEL__
 #include <sys/mman.h>
 #include <stdio.h>