Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md:
  md: fix input truncation in safe_delay_store()
  md: check for memory allocation failure in faulty personality
  md: build failure due to missing delay.h
  md: Relax minimum size restrictions on chunk_size.
  md: remove space after function name in declaration and call.
  md: Remove unnecessary #includes, #defines, and function declarations.
  md: Convert remaining 1k representations in linear.c to sectors.
  md: linear.c: Make two local variables sector-based.
  md: linear: Represent dev_info->size and dev_info->offset in sectors.
  md: linear.c: Remove broken debug code.
  md: linear.c: Remove pointless initialization of curr_offset.
  md: linear.c: Fix typo in comment.
  md: Don't try to set an array to 'read-auto' if it is already in that state.
  md: Allow metadata_version to be updated for externally managed metadata.
  md: Fix rdev_size_store with size == 0

9 files changed, 114 insertions, 174 deletions

diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index 268547dbfbd3..f26c1f9a475b 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -287,6 +287,8 @@ static int run(mddev_t *mddev)
 	int i;
 
 	conf_t *conf = kmalloc(sizeof(*conf), GFP_KERNEL);
+	if (!conf)
+		return -ENOMEM;
 
 	for (i=0; i<Modes; i++) {
 		atomic_set(&conf->counters[i], 0);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index b9cbee688fae..190147c79e79 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -16,16 +16,8 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 
-#include <linux/module.h>
-
-#include <linux/raid/md.h>
-#include <linux/slab.h>
 #include <linux/raid/linear.h>
 
-#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
-#define MD_PERSONALITY
-
 /*
  * find which device holds a particular offset 
  */
@@ -33,16 +25,15 @@ static inline dev_info_t *which_dev(mddev_t *mddev, sector_t sector)
 {
 	dev_info_t *hash;
 	linear_conf_t *conf = mddev_to_conf(mddev);
-	sector_t block = sector >> 1;
 
 	/*
 	 * sector_div(a,b) returns the remainer and sets a to a/b
 	 */
-	block >>= conf->preshift;
-	(void)sector_div(block, conf->hash_spacing);
-	hash = conf->hash_table[block];
+	sector >>= conf->sector_shift;
+	(void)sector_div(sector, conf->spacing);
+	hash = conf->hash_table[sector];
 
-	while ((sector>>1) >= (hash->size + hash->offset))
+	while (sector >= hash->num_sectors + hash->start_sector)
 		hash++;
 	return hash;
 }
@@ -65,7 +56,7 @@ static int linear_mergeable_bvec(struct request_queue *q,
 	sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
 
 	dev0 = which_dev(mddev, sector);
-	maxsectors = (dev0->size << 1) - (sector - (dev0->offset<<1));
+	maxsectors = dev0->num_sectors - (sector - dev0->start_sector);
 
 	if (maxsectors < bio_sectors)
 		maxsectors = 0;
@@ -112,8 +103,8 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 	dev_info_t **table;
 	mdk_rdev_t *rdev;
 	int i, nb_zone, cnt;
-	sector_t min_spacing;
-	sector_t curr_offset;
+	sector_t min_sectors;
+	sector_t curr_sector;
 	struct list_head *tmp;
 
 	conf = kzalloc (sizeof (*conf) + raid_disks*sizeof(dev_info_t),
@@ -145,7 +136,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 		    mddev->queue->max_sectors > (PAGE_SIZE>>9))
 			blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
-		disk->size = rdev->size;
+		disk->num_sectors = rdev->size * 2;
 		conf->array_sectors += rdev->size * 2;
 
 		cnt++;
@@ -155,34 +146,34 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 		goto out;
 	}
 
-	min_spacing = conf->array_sectors / 2;
-	sector_div(min_spacing, PAGE_SIZE/sizeof(struct dev_info *));
+	min_sectors = conf->array_sectors;
+	sector_div(min_sectors, PAGE_SIZE/sizeof(struct dev_info *));
 
-	/* min_spacing is the minimum spacing that will fit the hash
+	/* min_sectors is the minimum spacing that will fit the hash
 	 * table in one PAGE.  This may be much smaller than needed.
 	 * We find the smallest non-terminal set of consecutive devices
-	 * that is larger than min_spacing as use the size of that as
+	 * that is larger than min_sectors and use the size of that as
 	 * the actual spacing
 	 */
-	conf->hash_spacing = conf->array_sectors / 2;
+	conf->spacing = conf->array_sectors;
 	for (i=0; i < cnt-1 ; i++) {
-		sector_t sz = 0;
+		sector_t tmp = 0;
 		int j;
-		for (j = i; j < cnt - 1 && sz < min_spacing; j++)
-			sz += conf->disks[j].size;
-		if (sz >= min_spacing && sz < conf->hash_spacing)
-			conf->hash_spacing = sz;
+		for (j = i; j < cnt - 1 && tmp < min_sectors; j++)
+			tmp += conf->disks[j].num_sectors;
+		if (tmp >= min_sectors && tmp < conf->spacing)
+			conf->spacing = tmp;
 	}
 
-	/* hash_spacing may be too large for sector_div to work with,
+	/* spacing may be too large for sector_div to work with,
 	 * so we might need to pre-shift
 	 */
-	conf->preshift = 0;
+	conf->sector_shift = 0;
 	if (sizeof(sector_t) > sizeof(u32)) {
-		sector_t space = conf->hash_spacing;
+		sector_t space = conf->spacing;
 		while (space > (sector_t)(~(u32)0)) {
 			space >>= 1;
-			conf->preshift++;
+			conf->sector_shift++;
 		}
 	}
 	/*
@@ -194,9 +185,9 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 		unsigned round;
 		unsigned long base;
 
-		sz = conf->array_sectors >> (conf->preshift + 1);
+		sz = conf->array_sectors >> conf->sector_shift;
 		sz += 1; /* force round-up */
-		base = conf->hash_spacing >> conf->preshift;
+		base = conf->spacing >> conf->sector_shift;
 		round = sector_div(sz, base);
 		nb_zone = sz + (round ? 1 : 0);
 	}
@@ -211,32 +202,31 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 	 * Here we generate the linear hash table
 	 * First calculate the device offsets.
 	 */
-	conf->disks[0].offset = 0;
+	conf->disks[0].start_sector = 0;
 	for (i = 1; i < raid_disks; i++)
-		conf->disks[i].offset =
-			conf->disks[i-1].offset +
-			conf->disks[i-1].size;
+		conf->disks[i].start_sector =
+			conf->disks[i-1].start_sector +
+			conf->disks[i-1].num_sectors;
 
 	table = conf->hash_table;
-	curr_offset = 0;
 	i = 0;
-	for (curr_offset = 0;
-	     curr_offset < conf->array_sectors / 2;
-	     curr_offset += conf->hash_spacing) {
+	for (curr_sector = 0;
+	     curr_sector < conf->array_sectors;
+	     curr_sector += conf->spacing) {
 
 		while (i < raid_disks-1 &&
-		       curr_offset >= conf->disks[i+1].offset)
+		       curr_sector >= conf->disks[i+1].start_sector)
 			i++;
 
 		*table ++ = conf->disks + i;
 	}
 
-	if (conf->preshift) {
-		conf->hash_spacing >>= conf->preshift;
-		/* round hash_spacing up so that when we divide by it,
+	if (conf->sector_shift) {
+		conf->spacing >>= conf->sector_shift;
+		/* round spacing up so that when we divide by it,
 		 * we err on the side of "too-low", which is safest.
 		 */
-		conf->hash_spacing++;
+		conf->spacing++;
 	}
 
 	BUG_ON(table - conf->hash_table > nb_zone);
@@ -317,7 +307,6 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
 	const int rw = bio_data_dir(bio);
 	mddev_t *mddev = q->queuedata;
 	dev_info_t *tmp_dev;
-	sector_t block;
 	int cpu;
 
 	if (unlikely(bio_barrier(bio))) {
@@ -332,29 +321,33 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
 	part_stat_unlock();
 
 	tmp_dev = which_dev(mddev, bio->bi_sector);
-	block = bio->bi_sector >> 1;
     
-	if (unlikely(block >= (tmp_dev->size + tmp_dev->offset)
-		     || block < tmp_dev->offset)) {
+	if (unlikely(bio->bi_sector >= (tmp_dev->num_sectors +
+					tmp_dev->start_sector)
+		     || (bio->bi_sector <
+			 tmp_dev->start_sector))) {
 		char b[BDEVNAME_SIZE];
 
-		printk("linear_make_request: Block %llu out of bounds on "
-			"dev %s size %llu offset %llu\n",
-			(unsigned long long)block,
+		printk("linear_make_request: Sector %llu out of bounds on "
+			"dev %s: %llu sectors, offset %llu\n",
+			(unsigned long long)bio->bi_sector,
 			bdevname(tmp_dev->rdev->bdev, b),
-			(unsigned long long)tmp_dev->size,
-		        (unsigned long long)tmp_dev->offset);
+			(unsigned long long)tmp_dev->num_sectors,
+			(unsigned long long)tmp_dev->start_sector);
 		bio_io_error(bio);
 		return 0;
 	}
 	if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >
-		     (tmp_dev->offset + tmp_dev->size)<<1)) {
+		     tmp_dev->start_sector + tmp_dev->num_sectors)) {
 		/* This bio crosses a device boundary, so we have to
 		 * split it.
 		 */
 		struct bio_pair *bp;
+
 		bp = bio_split(bio,
-			       ((tmp_dev->offset + tmp_dev->size)<<1) - bio->bi_sector);
+			       tmp_dev->start_sector + tmp_dev->num_sectors
+			       - bio->bi_sector);
+
 		if (linear_make_request(q, &bp->bio1))
 			generic_make_request(&bp->bio1);
 		if (linear_make_request(q, &bp->bio2))
@@ -364,7 +357,8 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
 	}
 		    
 	bio->bi_bdev = tmp_dev->rdev->bdev;
-	bio->bi_sector = bio->bi_sector - (tmp_dev->offset << 1) + tmp_dev->rdev->data_offset;
+	bio->bi_sector = bio->bi_sector - tmp_dev->start_sector
+		+ tmp_dev->rdev->data_offset;
 
 	return 1;
 }
@@ -372,29 +366,6 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
 static void linear_status (struct seq_file *seq, mddev_t *mddev)
 {
 
-#undef MD_DEBUG
-#ifdef MD_DEBUG
-	int j;
-	linear_conf_t *conf = mddev_to_conf(mddev);
-	sector_t s = 0;
-  
-	seq_printf(seq, "      ");
-	for (j = 0; j < mddev->raid_disks; j++)
-	{
-		char b[BDEVNAME_SIZE];
-		s += conf->smallest_size;
-		seq_printf(seq, "[%s",
-			   bdevname(conf->hash_table[j][0].rdev->bdev,b));
-
-		while (s > conf->hash_table[j][0].offset +
-		           conf->hash_table[j][0].size)
-			seq_printf(seq, "/%s] ",
-				   bdevname(conf->hash_table[j][1].rdev->bdev,b));
-		else
-			seq_printf(seq, "] ");
-	}
-	seq_printf(seq, "\n");
-#endif
 	seq_printf(seq, " %dk rounding", mddev->chunk_size/1024);
 }
 
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0a3a4bdcd4af..aaa3d465de4e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -32,31 +32,21 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-#include <linux/module.h>
-#include <linux/kernel.h>
 #include <linux/kthread.h>
-#include <linux/linkage.h>
 #include <linux/raid/md.h>
 #include <linux/raid/bitmap.h>
 #include <linux/sysctl.h>
 #include <linux/buffer_head.h> /* for invalidate_bdev */
 #include <linux/poll.h>
-#include <linux/mutex.h>
 #include <linux/ctype.h>
-#include <linux/freezer.h>
-
-#include <linux/init.h>
-
+#include <linux/hdreg.h>
+#include <linux/proc_fs.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
 #include <linux/file.h>
-
-#ifdef CONFIG_KMOD
-#include <linux/kmod.h>
-#endif
-
-#include <asm/unaligned.h>
+#include <linux/delay.h>
 
 #define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
 
 /* 63 partitions with the alternate major number (mdp) */
 #define MdpMinorShift 6
@@ -66,7 +56,7 @@
 
 
 #ifndef MODULE
-static void autostart_arrays (int part);
+static void autostart_arrays(int part);
 #endif
 
 static LIST_HEAD(pers_list);
@@ -212,7 +202,7 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
 		)
 
 
-static int md_fail_request (struct request_queue *q, struct bio *bio)
+static int md_fail_request(struct request_queue *q, struct bio *bio)
 {
 	bio_io_error(bio);
 	return 0;
@@ -2106,8 +2096,6 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
 
 	if (strict_strtoull(buf, 10, &size) < 0)
 		return -EINVAL;
-	if (size < my_mddev->size)
-		return -EINVAL;
 	if (my_mddev->pers && rdev->raid_disk >= 0) {
 		if (my_mddev->persistent) {
 			size = super_types[my_mddev->major_version].
@@ -2118,9 +2106,9 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
 			size = (rdev->bdev->bd_inode->i_size >> 10);
 			size -= rdev->data_offset/2;
 		}
-		if (size < my_mddev->size)
-			return -EINVAL; /* component must fit device */
 	}
+	if (size < my_mddev->size)
+		return -EINVAL; /* component must fit device */
 
 	rdev->size = size;
 	if (size > oldsize && my_mddev->external) {
@@ -2406,12 +2394,11 @@ safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
 	int i;
 	unsigned long msec;
 	char buf[30];
-	char *e;
+
 	/* remove a period, and count digits after it */
 	if (len >= sizeof(buf))
 		return -EINVAL;
-	strlcpy(buf, cbuf, len);
-	buf[len] = 0;
+	strlcpy(buf, cbuf, sizeof(buf));
 	for (i=0; i<len; i++) {
 		if (dot) {
 			if (isdigit(buf[i])) {
@@ -2424,8 +2411,7 @@ safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
 			buf[i] = 0;
 		}
 	}
-	msec = simple_strtoul(buf, &e, 10);
-	if (e == buf || (*e && *e != '\n'))
+	if (strict_strtoul(buf, 10, &msec) < 0)
 		return -EINVAL;
 	msec = (msec * 1000) / scale;
 	if (msec == 0)
@@ -2727,9 +2713,9 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
 		break;
 	case read_auto:
 		if (mddev->pers) {
-			if (mddev->ro != 1)
+			if (mddev->ro == 0)
 				err = do_md_stop(mddev, 1, 0);
-			else
+			else if (mddev->ro == 1)
 				err = restart_array(mddev);
 			if (err == 0) {
 				mddev->ro = 2;
@@ -2945,7 +2931,13 @@ metadata_store(mddev_t *mddev, const char *buf, size_t len)
 {
 	int major, minor;
 	char *e;
-	if (!list_empty(&mddev->disks))
+	/* Changing the details of 'external' metadata is
+	 * always permitted.  Otherwise there must be
+	 * no devices attached to the array.
+	 */
+	if (mddev->external && strncmp(buf, "external:", 9) == 0)
+		;
+	else if (!list_empty(&mddev->disks))
 		return -EBUSY;
 
 	if (cmd_match(buf, "none")) {
@@ -3527,17 +3519,12 @@ static int do_md_run(mddev_t * mddev)
 			return -EINVAL;
 		}
 		/*
-		 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+		 * chunk-size has to be a power of 2
 		 */
 		if ( (1 << ffz(~chunk_size)) != chunk_size) {
 			printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
 			return -EINVAL;
 		}
-		if (chunk_size < PAGE_SIZE) {
-			printk(KERN_ERR "too small chunk_size: %d < %ld\n",
-				chunk_size, PAGE_SIZE);
-			return -EINVAL;
-		}
 
 		/* devices must have minimum size of one chunk */
 		rdev_for_each(rdev, tmp, mddev) {
@@ -3555,12 +3542,10 @@ static int do_md_run(mddev_t * mddev)
 		}
 	}
 
-#ifdef CONFIG_KMOD
 	if (mddev->level != LEVEL_NONE)
 		request_module("md-level-%d", mddev->level);
 	else if (mddev->clevel[0])
 		request_module("md-%s", mddev->clevel);
-#endif
 
 	/*
 	 * Drop all container device buffers, from now on
@@ -3971,10 +3956,10 @@ static void autorun_array(mddev_t *mddev)
 	}
 	printk("\n");
 
-	err = do_md_run (mddev);
+	err = do_md_run(mddev);
 	if (err) {
 		printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
-		do_md_stop (mddev, 0, 0);
+		do_md_stop(mddev, 0, 0);
 	}
 }
 
@@ -4333,7 +4318,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
 
 	if (!(info->state & (1<<MD_DISK_FAULTY))) {
 		int err;
-		rdev = md_import_device (dev, -1, 0);
+		rdev = md_import_device(dev, -1, 0);
 		if (IS_ERR(rdev)) {
 			printk(KERN_WARNING 
 				"md: error, md_import_device() returned %ld\n",
@@ -4415,7 +4400,7 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
 		return -EINVAL;
 	}
 
-	rdev = md_import_device (dev, -1, 0);
+	rdev = md_import_device(dev, -1, 0);
 	if (IS_ERR(rdev)) {
 		printk(KERN_WARNING 
 			"md: error, md_import_device() returned %ld\n",
@@ -4934,11 +4919,11 @@ static int md_ioctl(struct inode *inode, struct file *file,
 			goto done_unlock;
 
 		case STOP_ARRAY:
-			err = do_md_stop (mddev, 0, 1);
+			err = do_md_stop(mddev, 0, 1);
 			goto done_unlock;
 
 		case STOP_ARRAY_RO:
-			err = do_md_stop (mddev, 1, 1);
+			err = do_md_stop(mddev, 1, 1);
 			goto done_unlock;
 
 	}
@@ -4987,7 +4972,7 @@ static int md_ioctl(struct inode *inode, struct file *file,
 			goto done_unlock;
 
 		case RUN_ARRAY:
-			err = do_md_run (mddev);
+			err = do_md_run(mddev);
 			goto done_unlock;
 
 		case SET_BITMAP_FILE:
@@ -5425,11 +5410,11 @@ static int md_seq_show(struct seq_file *seq, void *v)
 			seq_printf(seq, " super non-persistent");
 
 		if (mddev->pers) {
-			mddev->pers->status (seq, mddev);
+			mddev->pers->status(seq, mddev);
 	 		seq_printf(seq, "\n      ");
 			if (mddev->pers->sync_request) {
 				if (mddev->curr_resync > 2) {
-					status_resync (seq, mddev);
+					status_resync(seq, mddev);
 					seq_printf(seq, "\n      ");
 				} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
 					seq_printf(seq, "\tresync=DELAYED\n      ");
@@ -6260,7 +6245,7 @@ static int md_notify_reboot(struct notifier_block *this,
 				 * appears to still be in use.  Hence
 				 * the '100'.
 				 */
-				do_md_stop (mddev, 1, 100);
+				do_md_stop(mddev, 1, 100);
 				mddev_unlock(mddev);
 			}
 		/*
@@ -6304,7 +6289,7 @@ static int __init md_init(void)
 	raid_table_header = register_sysctl_table(raid_root_table);
 
 	md_geninit();
-	return (0);
+	return 0;
 }
 
 
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 8bb8794129b3..8744014b9d80 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -19,16 +19,7 @@
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
 #include <linux/raid/multipath.h>
-#include <linux/buffer_head.h>
-#include <asm/atomic.h>
-
-#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
-#define MD_PERSONALITY
 
 #define MAX_WORK_PER_DISK 128
 
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 53508a8a981d..8ac6488ad0dc 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -18,13 +18,8 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 
-#include <linux/module.h>
 #include <linux/raid/raid0.h>
 
-#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
-#define MD_PERSONALITY
-
 static void raid0_unplug(struct request_queue *q)
 {
 	mddev_t *mddev = q->queuedata;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index b9764429d856..9c788e2489b1 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -32,6 +32,7 @@
  */
 
 #include "dm-bio-list.h"
+#include <linux/delay.h>
 #include <linux/raid/raid1.h>
 #include <linux/raid/bitmap.h>
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8bdc9bfc2887..da5129a24b18 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -19,6 +19,7 @@
  */
 
 #include "dm-bio-list.h"
+#include <linux/delay.h>
 #include <linux/raid/raid10.h>
 #include <linux/raid/bitmap.h>
 
@@ -2028,8 +2029,9 @@ static int run(mddev_t *mddev)
 	int nc, fc, fo;
 	sector_t stride, size;
 
-	if (mddev->chunk_size == 0) {
-		printk(KERN_ERR "md/raid10: non-zero chunk size required.\n");
+	if (mddev->chunk_size < PAGE_SIZE) {
+		printk(KERN_ERR "md/raid10: chunk size must be "
+		       "at least PAGE_SIZE(%ld).\n", PAGE_SIZE);
 		return -EINVAL;
 	}
 
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ae16794bef20..a36a7435edf5 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -43,12 +43,7 @@
  * miss any bits.
  */
 
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/highmem.h>
-#include <linux/bitops.h>
 #include <linux/kthread.h>
-#include <asm/atomic.h>
 #include "raid6.h"
 
 #include <linux/raid/bitmap.h>
@@ -275,7 +270,7 @@ static int grow_buffers(struct stripe_head *sh, int num)
 	return 0;
 }
 
-static void raid5_build_block (struct stripe_head *sh, int i);
+static void raid5_build_block(struct stripe_head *sh, int i);
 
 static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks)
 {
@@ -1151,7 +1146,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
 	release_stripe(sh);
 }
 
-static void raid5_end_write_request (struct bio *bi, int error)
+static void raid5_end_write_request(struct bio *bi, int error)
 {
  	struct stripe_head *sh = bi->bi_private;
 	raid5_conf_t *conf = sh->raid_conf;
@@ -1183,7 +1178,7 @@ static void raid5_end_write_request (struct bio *bi, int error)
 
 static sector_t compute_blocknr(struct stripe_head *sh, int i);
 	
-static void raid5_build_block (struct stripe_head *sh, int i)
+static void raid5_build_block(struct stripe_head *sh, int i)
 {
 	struct r5dev *dev = &sh->dev[i];
 
@@ -1221,10 +1216,10 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
 			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
 		}
 		set_bit(Faulty, &rdev->flags);
-		printk (KERN_ALERT
-			"raid5: Disk failure on %s, disabling device.\n"
-			"raid5: Operation continuing on %d devices.\n",
-			bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
+		printk(KERN_ALERT
+		       "raid5: Disk failure on %s, disabling device.\n"
+		       "raid5: Operation continuing on %d devices.\n",
+		       bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
 	}
 }
 
@@ -1320,8 +1315,8 @@ static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks,
 			*dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks;
 			break;
 		default:
-			printk (KERN_CRIT "raid6: unsupported algorithm %d\n",
-				conf->algorithm);
+			printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
+			       conf->algorithm);
 		}
 		break;
 	}
@@ -1396,8 +1391,8 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i)
 			}
 			break;
 		default:
-			printk (KERN_CRIT "raid6: unsupported algorithm %d\n",
-				conf->algorithm);
+			printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
+			       conf->algorithm);
 		}
 		break;
 	}
@@ -1405,7 +1400,7 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i)
 	chunk_number = stripe * data_disks + i;
 	r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset;
 
-	check = raid5_compute_sector (r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf);
+	check = raid5_compute_sector(r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf);
 	if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) {
 		printk(KERN_ERR "compute_blocknr: map not correct\n");
 		return 0;
@@ -4012,6 +4007,13 @@ static int run(mddev_t *mddev)
 		return -EIO;
 	}
 
+	if (mddev->chunk_size < PAGE_SIZE) {
+		printk(KERN_ERR "md/raid5: chunk_size must be at least "
+		       "PAGE_SIZE but %d < %ld\n",
+		       mddev->chunk_size, PAGE_SIZE);
+		return -EINVAL;
+	}
+
 	if (mddev->reshape_position != MaxSector) {
 		/* Check that we can continue the reshape.
 		 * Currently only disks can change, it must
@@ -4289,7 +4291,7 @@ static int stop(mddev_t *mddev)
 }
 
 #ifdef DEBUG
-static void print_sh (struct seq_file *seq, struct stripe_head *sh)
+static void print_sh(struct seq_file *seq, struct stripe_head *sh)
 {
 	int i;
 
@@ -4305,7 +4307,7 @@ static void print_sh (struct seq_file *seq, struct stripe_head *sh)
 	seq_printf(seq, "\n");
 }
 
-static void printall (struct seq_file *seq, raid5_conf_t *conf)
+static void printall(struct seq_file *seq, raid5_conf_t *conf)
 {
 	struct stripe_head *sh;
 	struct hlist_node *hn;
@@ -4323,7 +4325,7 @@ static void printall (struct seq_file *seq, raid5_conf_t *conf)
 }
 #endif
 
-static void status (struct seq_file *seq, mddev_t *mddev)
+static void status(struct seq_file *seq, mddev_t *mddev)
 {
 	raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
 	int i;
diff --git a/drivers/md/raid6.h b/drivers/md/raid6.h
index 31cbee71365f..98dcde88470e 100644
--- a/drivers/md/raid6.h
+++ b/drivers/md/raid6.h
@@ -18,15 +18,6 @@
 /* Set to 1 to use kernel-wide empty_zero_page */
 #define RAID6_USE_EMPTY_ZERO_PAGE 0
 
-#include <linux/module.h>
-#include <linux/stddef.h>
-#include <linux/compiler.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/mempool.h>
-#include <linux/list.h>
-#include <linux/vmalloc.h>
 #include <linux/raid/md.h>
 #include <linux/raid/raid5.h>