Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm:
  dm crypt: use bio_add_page
  dm: merge max_hw_sector
  dm: trigger change uevent on rename
  dm crypt: fix write endio
  dm mpath: hp requires scsi
  dm: table detect io beyond device

drivers/md/Kconfig

@@ -269,7 +269,7 @@ config DM_MULTIPATH_RDAC
 
 config DM_MULTIPATH_HP
         tristate "HP MSA multipath support (EXPERIMENTAL)"
-        depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL
+        depends on DM_MULTIPATH && BLK_DEV_DM && SCSI && EXPERIMENTAL
         ---help---
           Multipath support for HP MSA (Active/Passive) series hardware.
 

drivers/md/dm-crypt.c

@@ -398,7 +398,8 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
 	struct bio *clone;
 	unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM;
-	unsigned int i;
+	unsigned i, len;
+	struct page *page;
 
 	clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
 	if (!clone)
@@ -407,10 +408,8 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
 	clone_init(io, clone);
 
 	for (i = 0; i < nr_iovecs; i++) {
-		struct bio_vec *bv = bio_iovec_idx(clone, i);
-
-		bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask);
-		if (!bv->bv_page)
+		page = mempool_alloc(cc->page_pool, gfp_mask);
+		if (!page)
 			break;
 
 		/*
@@ -421,15 +420,14 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
 		if (i == (MIN_BIO_PAGES - 1))
 			gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT;
 
-		bv->bv_offset = 0;
-		if (size > PAGE_SIZE)
-			bv->bv_len = PAGE_SIZE;
-		else
-			bv->bv_len = size;
+		len = (size > PAGE_SIZE) ? PAGE_SIZE : size;
+
+		if (!bio_add_page(clone, page, len, 0)) {
+			mempool_free(page, cc->page_pool);
+			break;
+		}
 
-		clone->bi_size += bv->bv_len;
-		clone->bi_vcnt++;
-		size -= bv->bv_len;
+		size -= len;
 	}
 
 	if (!clone->bi_size) {
@@ -511,6 +509,9 @@ static void crypt_endio(struct bio *clone, int error)
 	struct crypt_config *cc = io->target->private;
 	unsigned read_io = bio_data_dir(clone) == READ;
 
+	if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error))
+		error = -EIO;
+
 	/*
 	 * free the processed pages
 	 */
@@ -519,10 +520,8 @@ static void crypt_endio(struct bio *clone, int error)
 		goto out;
 	}
 
-	if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) {
-		error = -EIO;
+	if (unlikely(error))
 		goto out;
-	}
 
 	bio_put(clone);
 	kcryptd_queue_crypt(io);

drivers/md/dm-ioctl.c

@@ -332,6 +332,8 @@ static int dm_hash_rename(const char *old, const char *new)
 		dm_table_put(table);
 	}
 
+	dm_kobject_uevent(hc->md);
+
 	dm_put(hc->md);
 	up_write(&_hash_lock);
 	kfree(old_name);
@@ -1250,21 +1252,17 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
 	if (!table)
 		goto out_argv;
 
-	if (tmsg->sector >= dm_table_get_size(table)) {
+	ti = dm_table_find_target(table, tmsg->sector);
+	if (!dm_target_is_valid(ti)) {
 		DMWARN("Target message sector outside device.");
 		r = -EINVAL;
-		goto out_table;
-	}
-
-	ti = dm_table_find_target(table, tmsg->sector);
-	if (ti->type->message)
+	} else if (ti->type->message)
 		r = ti->type->message(ti, argc, argv);
 	else {
 		DMWARN("Target type does not support messages");
 		r = -EINVAL;
 	}
 
- out_table:
 	dm_table_put(table);
  out_argv:
 	kfree(argv);

drivers/md/dm-table.c

@@ -99,6 +99,9 @@ static void combine_restrictions_low(struct io_restrictions *lhs,
 	lhs->max_segment_size =
 		min_not_zero(lhs->max_segment_size, rhs->max_segment_size);
 
+	lhs->max_hw_sectors =
+		min_not_zero(lhs->max_hw_sectors, rhs->max_hw_sectors);
+
 	lhs->seg_boundary_mask =
 		min_not_zero(lhs->seg_boundary_mask, rhs->seg_boundary_mask);
 
@@ -189,8 +192,10 @@ static int alloc_targets(struct dm_table *t, unsigned int num)
 
 	/*
 	 * Allocate both the target array and offset array at once.
+	 * Append an empty entry to catch sectors beyond the end of
+	 * the device.
 	 */
-	n_highs = (sector_t *) dm_vcalloc(num, sizeof(struct dm_target) +
+	n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) +
 					  sizeof(sector_t));
 	if (!n_highs)
 		return -ENOMEM;
@@ -564,6 +569,9 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 	rs->max_segment_size =
 		min_not_zero(rs->max_segment_size, q->max_segment_size);
 
+	rs->max_hw_sectors =
+		min_not_zero(rs->max_hw_sectors, q->max_hw_sectors);
+
 	rs->seg_boundary_mask =
 		min_not_zero(rs->seg_boundary_mask,
 			     q->seg_boundary_mask);
@@ -701,6 +709,8 @@ static void check_for_valid_limits(struct io_restrictions *rs)
 {
 	if (!rs->max_sectors)
 		rs->max_sectors = SAFE_MAX_SECTORS;
+	if (!rs->max_hw_sectors)
+		rs->max_hw_sectors = SAFE_MAX_SECTORS;
 	if (!rs->max_phys_segments)
 		rs->max_phys_segments = MAX_PHYS_SEGMENTS;
 	if (!rs->max_hw_segments)
@@ -867,6 +877,9 @@ struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index)
 
 /*
  * Search the btree for the correct target.
+ *
+ * Caller should check returned pointer with dm_target_is_valid()
+ * to trap I/O beyond end of device.
  */
 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
 {
@@ -896,6 +909,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
 	q->max_hw_segments = t->limits.max_hw_segments;
 	q->hardsect_size = t->limits.hardsect_size;
 	q->max_segment_size = t->limits.max_segment_size;
+	q->max_hw_sectors = t->limits.max_hw_sectors;
 	q->seg_boundary_mask = t->limits.seg_boundary_mask;
 	q->bounce_pfn = t->limits.bounce_pfn;
 	if (t->limits.no_cluster)

drivers/md/dm.c

@@ -672,13 +672,19 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
 	return clone;
 }
 
-static void __clone_and_map(struct clone_info *ci)
+static int __clone_and_map(struct clone_info *ci)
 {
 	struct bio *clone, *bio = ci->bio;
-	struct dm_target *ti = dm_table_find_target(ci->map, ci->sector);
-	sector_t len = 0, max = max_io_len(ci->md, ci->sector, ti);
+	struct dm_target *ti;
+	sector_t len = 0, max;
 	struct dm_target_io *tio;
 
+	ti = dm_table_find_target(ci->map, ci->sector);
+	if (!dm_target_is_valid(ti))
+		return -EIO;
+
+	max = max_io_len(ci->md, ci->sector, ti);
+
 	/*
 	 * Allocate a target io object.
 	 */
@@ -736,6 +742,9 @@ static void __clone_and_map(struct clone_info *ci)
 		do {
 			if (offset) {
 				ti = dm_table_find_target(ci->map, ci->sector);
+				if (!dm_target_is_valid(ti))
+					return -EIO;
+
 				max = max_io_len(ci->md, ci->sector, ti);
 
 				tio = alloc_tio(ci->md);
@@ -759,6 +768,8 @@ static void __clone_and_map(struct clone_info *ci)
 
 		ci->idx++;
 	}
+
+	return 0;
 }
 
 /*
@@ -767,6 +778,7 @@ static void __clone_and_map(struct clone_info *ci)
 static int __split_bio(struct mapped_device *md, struct bio *bio)
 {
 	struct clone_info ci;
+	int error = 0;
 
 	ci.map = dm_get_table(md);
 	if (unlikely(!ci.map))
@@ -784,11 +796,11 @@ static int __split_bio(struct mapped_device *md, struct bio *bio)
 	ci.idx = bio->bi_idx;
 
 	start_io_acct(ci.io);
-	while (ci.sector_count)
-		__clone_and_map(&ci);
+	while (ci.sector_count && !error)
+		error = __clone_and_map(&ci);
 
 	/* drop the extra reference count */
-	dec_pending(ci.io, 0);
+	dec_pending(ci.io, error);
 	dm_table_put(ci.map);
 
 	return 0;
@@ -1502,7 +1514,7 @@ int dm_resume(struct mapped_device *md)
 
 	dm_table_unplug_all(map);
 
-	kobject_uevent(&md->disk->kobj, KOBJ_CHANGE);
+	dm_kobject_uevent(md);
 
 	r = 0;
 
@@ -1516,6 +1528,11 @@ out:
 /*-----------------------------------------------------------------
  * Event notification.
  *---------------------------------------------------------------*/
+void dm_kobject_uevent(struct mapped_device *md)
+{
+	kobject_uevent(&md->disk->kobj, KOBJ_CHANGE);
+}
+
 uint32_t dm_next_uevent_seq(struct mapped_device *md)
 {
 	return atomic_add_return(1, &md->uevent_seq);

drivers/md/dm.h

@@ -112,6 +112,11 @@ int dm_table_resume_targets(struct dm_table *t);
 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
 void dm_table_unplug_all(struct dm_table *t);
 
+/*
+ * To check the return value from dm_table_find_target().
+ */
+#define dm_target_is_valid(t) ((t)->table)
+
 /*-----------------------------------------------------------------
  * A registry of target types.
  *---------------------------------------------------------------*/
@@ -182,4 +187,6 @@ union map_info *dm_get_mapinfo(struct bio *bio);
 int dm_open_count(struct mapped_device *md);
 int dm_lock_for_deletion(struct mapped_device *md);
 
+void dm_kobject_uevent(struct mapped_device *md);
+
 #endif

include/linux/device-mapper.h

@@ -115,6 +115,7 @@ struct io_restrictions {
 	unsigned short		max_hw_segments;
 	unsigned short		hardsect_size;
 	unsigned int		max_segment_size;
+	unsigned int		max_hw_sectors;
 	unsigned long		seg_boundary_mask;
 	unsigned long		bounce_pfn;
 	unsigned char		no_cluster; /* inverted so that 0 is default */