From: Alan Cox <alan@linux.intel.com>
Date: Fri, 20 Feb 2015 23:55:07 +0000 (+0000)
Subject: inode: Fix bug in direct I/O with holes
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=e19fddfc6282ecc253a096464ca33e0c85e656f2;p=FUZIX.git

inode: Fix bug in direct I/O with holes
---

diff --git a/Kernel/inode.c b/Kernel/inode.c
index 7d5f68b8..e9793b93 100644
--- a/Kernel/inode.c
+++ b/Kernel/inode.c
@@ -61,7 +61,7 @@ void readi(inoptr ino, uint8_t flag)
 			pblk = bmap(ino, udata.u_offset >> BLKSHIFT, 1);
 
 #if defined(read_direct)
-			if (!ispipe && amount == BLKSIZE && read_direct(flag) && bfind(dev, pblk) == 0) {
+			if (!ispipe && pblk != NULLBLK && amount == BLKSIZE && read_direct(flag) && bfind(dev, pblk) == 0) {
 				/* we can transfer direct from disk to the userspace buffer */
 				off_t uostash;
 				usize_t ucstash;