servers/apfs/buffer.c: fixed put_block call to find_block instead of get_block that creates the block if it doesn't exist.

gistfile1.diff

commit 4d7f4a5e3b9561f37ee5f61727e7b48c3065c446
Author: Hussein El-Sayed <hussein.009@gmail.com>
Date:   Fri Dec 30 23:28:15 2011 +0000

    servers/apfs/buffer.c: fixed put_block call to find_block instead of get_blo
    that creates the block if it doesn't exist.

diff --git a/servers/apfs/buffer.c b/servers/apfs/buffer.c
index a5c77b4..de18e8c 100644
--- a/servers/apfs/buffer.c
+++ b/servers/apfs/buffer.c
@@ -18,22 +18,32 @@ PUBLIC void buf_pool(void)
   rear = NULL;
 }

-
-
 /*===========================================================================*
- *                             get_block                                    *
+ *                            find_block                                    *
  *===========================================================================*/
-PUBLIC struct buf *get_block(dev_t dev, ino_t inum)
+PRIVATE struct buf *find_block(dev_t dev, ino_t inum)
 {
   struct buf *bp = front;

   while(bp != NULL) {
-       if (bp->b_dev == dev && bp->b_num == inum) {
+       if (bp->b_dev == dev && bp->b_num == inum) {
                bp->b_count++;
                return(bp);
        }
        bp = bp->b_next;
   }
+  /* Buffer not found */
+  return (NULL);
+}
+
+/*===========================================================================*
+ *                             get_block                                    *
+ *===========================================================================*/
+PUBLIC struct buf *get_block(dev_t dev, ino_t inum)
+{
+  struct buf *bp = find_block(dev, inum);
+
+  if(bp != NULL) return bp;

   /* Buffer was not found. Try to allocate a new one */
   return new_block(dev, inum);
@@ -81,7 +91,7 @@ PUBLIC void put_block(dev_t dev, ino_t inum)
 {
   struct buf *bp;

-  bp = get_block(dev, inum);
+  bp = find_block(dev, inum);
   if (bp == NULL) return; /* We didn't find the block. Nothing to put. */

   bp->b_count--;       /* Compensate for above 'get_block'. */