patch-2.3.9 linux/fs/sysv/truncate.c

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diff -u --recursive --new-file v2.3.8/linux/fs/sysv/truncate.c linux/fs/sysv/truncate.c
@@ -36,7 +36,7 @@
  */
 
 #define DATA_BUFFER_USED(bh) \
-	((bh->b_count > 1) || buffer_locked(bh))
+	(atomic_read(&bh->b_count) || buffer_locked(bh))
 
 /* We throw away any data beyond inode->i_size. */
 

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