dm-integrity: allocate the recalculate buffer with kmalloc

Allocate the recalculate buffer with kmalloc rather than vmalloc. This
will be needed later, for the simplification of the asynchronous hash
interface.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: Mikulas Patocka

drivers/md/dm-integrity.c

@@ -2998,7 +2998,7 @@ static void integrity_recalc(struct work_struct *w)
 	unsigned recalc_sectors = RECALC_SECTORS;
 
 retry:
-	recalc_buffer = __vmalloc(recalc_sectors << SECTOR_SHIFT, GFP_NOIO);
+	recalc_buffer = kmalloc(recalc_sectors << SECTOR_SHIFT, GFP_NOIO | __GFP_NOWARN);
 	if (!recalc_buffer) {
 oom:
 		recalc_sectors >>= 1;
@@ -3012,7 +3012,7 @@ static void integrity_recalc(struct work_struct *w)
 		recalc_tags_size += ic->internal_hash_digestsize - ic->tag_size;
 	recalc_tags = kvmalloc(recalc_tags_size, GFP_NOIO);
 	if (!recalc_tags) {
-		vfree(recalc_buffer);
+		kfree(recalc_buffer);
 		recalc_buffer = NULL;
 		goto oom;
 	}
@@ -3078,7 +3078,7 @@ static void integrity_recalc(struct work_struct *w)
 		goto err;
 
 	io_req.bi_opf = REQ_OP_READ;
-	io_req.mem.type = DM_IO_VMA;
+	io_req.mem.type = DM_IO_KMEM;
 	io_req.mem.ptr.addr = recalc_buffer;
 	io_req.notify.fn = NULL;
 	io_req.client = ic->io;
@@ -3136,7 +3136,7 @@ static void integrity_recalc(struct work_struct *w)
 	recalc_write_super(ic);
 
 free_ret:
-	vfree(recalc_buffer);
+	kfree(recalc_buffer);
 	kvfree(recalc_tags);
 }