patch-2.4.10 linux/drivers/block/blkpg.c

• Lines: 56
• Date: Mon Sep 17 15:37:33 2001
• Orig file: v2.4.9/linux/drivers/block/blkpg.c
• Orig date: Sun May 20 11:34:05 2001

diff -u --recursive --new-file v2.4.9/linux/drivers/block/blkpg.c linux/drivers/block/blkpg.c
@@ -54,17 +54,6 @@
  * Note that several drives may have the same major.
  */
 
-/* a linear search, superfluous when dev is a pointer */
-static struct gendisk *get_gendisk(kdev_t dev) {
-	struct gendisk *g;
-	int m = MAJOR(dev);
-
-	for (g = gendisk_head; g; g = g->next)
-		if (g->major == m)
-			break;
-	return g;
-}
-
 /*
  * Add a partition.
  *
@@ -250,6 +239,7 @@
 		case BLKGETSIZE:
 			/* Today get_gendisk() requires a linear scan;
 			   add this when dev has pointer type. */
+			/* add BLKGETSIZE64 too */
 			g = get_gendisk(dev);
 			if (!g)
 				longval = 0;
@@ -273,6 +263,29 @@
 		case BLKELVSET:
 			return blkelvset_ioctl(&blk_get_queue(dev)->elevator,
 					       (blkelv_ioctl_arg_t *) arg);
+
+		case BLKBSZGET:
+			/* get the logical block size (cf. BLKSSZGET) */
+			intval = BLOCK_SIZE;
+			if (blksize_size[MAJOR(dev)])
+				intval = blksize_size[MAJOR(dev)][MINOR(dev)];
+			return put_user (intval, (int *) arg);
+
+		case BLKBSZSET:
+			/* set the logical block size */
+			if (!capable (CAP_SYS_ADMIN))
+				return -EACCES;
+			if (!dev || !arg)
+				return -EINVAL;
+			if (get_user (intval, (int *) arg))
+				return -EFAULT;
+			if (intval > PAGE_SIZE || intval < 512 ||
+			    (intval & (intval - 1)))
+				return -EINVAL;
+			if (is_mounted (dev) || is_swap_partition (dev))
+				return -EBUSY;
+			set_blocksize (dev, intval);
+			return 0;
 
 		default:
 			return -EINVAL;