shithub: lwext4

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ref: 4c155036f9ce3a74bc3eb3bb79725616d3b6c125
parent: 1a96ef0a24a443094ad3c0293387a70e607227ee
author: gkostka <[email protected]>
date: Thu Dec 1 11:37:23 EST 2016 

ext4_blockdev: don't make zero length block read/write operations

Patch submitted by [email protected].


--- a/src/ext4_blockdev.c
+++ b/src/ext4_blockdev.c
@@ -350,14 +350,16 @@
 
 	/*Aligned data*/
 	blen = len / bdev->bdif->ph_bsize;
-	r = ext4_bdif_bwrite(bdev, p, block_idx, blen);
-	if (r != EOK)
-		return r;
+	if (blen != 0) {
+		r = ext4_bdif_bwrite(bdev, p, block_idx, blen);
+		if (r != EOK)
+			return r;
 
-	p += bdev->bdif->ph_bsize * blen;
-	len -= bdev->bdif->ph_bsize * blen;
+		p += bdev->bdif->ph_bsize * blen;
+		len -= bdev->bdif->ph_bsize * blen;
 
-	block_idx += blen;
+		block_idx += blen;
+	}
 
 	/*Rest of the data*/
 	if (len) {
@@ -416,14 +418,16 @@
 	/*Aligned data*/
 	blen = len / bdev->bdif->ph_bsize;
 
-	r = ext4_bdif_bread(bdev, p, block_idx, blen);
-	if (r != EOK)
-		return r;
+	if (blen != 0) {
+		r = ext4_bdif_bread(bdev, p, block_idx, blen);
+		if (r != EOK)
+			return r;
 
-	p += bdev->bdif->ph_bsize * blen;
-	len -= bdev->bdif->ph_bsize * blen;
+		p += bdev->bdif->ph_bsize * blen;
+		len -= bdev->bdif->ph_bsize * blen;
 
-	block_idx += blen;
+		block_idx += blen;
+	}
 
 	/*Rest of the data*/
 	if (len) {