[PATCH] ext4 balloc: say rb_entry not list_entry

The reservations tree is an rb_tree not a list, so it's less confusing to use
rb_entry() than list_entry() - though they're both just container_of().
Signed-off-by: NMingming Cao <cmm@us.ibm.com>
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/ext4/balloc.c

@@ -165,7 +165,7 @@ static void __rsv_window_dump(struct rb_root *root, int verbose,
 
 	printk("Block Allocation Reservation Windows Map (%s):\n", fn);
 	while (n) {
-		rsv = list_entry(n, struct ext4_reserve_window_node, rsv_node);
+		rsv = rb_entry(n, struct ext4_reserve_window_node, rsv_node);
 		if (verbose)
 			printk("reservation window 0x%p "
 			       "start:  %llu, end:  %llu\n",
@@ -966,7 +966,7 @@ static int find_next_reservable_window(
 
 		prev = rsv;
 		next = rb_next(&rsv->rsv_node);
-		rsv = list_entry(next,struct ext4_reserve_window_node,rsv_node);
+		rsv = rb_entry(next,struct ext4_reserve_window_node,rsv_node);
 
 		/*
 		 * Reached the last reservation, we can just append to the
@@ -1210,7 +1210,7 @@ static void try_to_extend_reservation(struct ext4_reserve_window_node *my_rsv,
 	if (!next)
 		my_rsv->rsv_end += size;
 	else {
-		next_rsv = list_entry(next, struct ext4_reserve_window_node, rsv_node);
+		next_rsv = rb_entry(next, struct ext4_reserve_window_node, rsv_node);
 
 		if ((next_rsv->rsv_start - my_rsv->rsv_end - 1) >= size)
 			my_rsv->rsv_end += size;