linux-kernel - [PATCH 3/5] staging: lustre: osc: Use list_for_each_entry

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Date:   Sun,  5 Mar 2017 22:36:48 +0530
From:   simran singhal <singhalsimran0@...il.com>
To:     oleg.drokin@...el.com
Cc:     andreas.dilger@...el.com, jsimmons@...radead.org,
        gregkh@...uxfoundation.org, lustre-devel@...ts.lustre.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: [PATCH 3/5] staging: lustre: osc: Use list_for_each_entry_safe

Doubly linked lists which are  iterated  using list_empty
and list_entry macros have been replaced with list_for_each_entry_safe
macro.
This makes the iteration simpler and more readable.

This patch replaces the while loop containing list_empty and list_entry
with list_for_each_entry_safe.

This was done with Coccinelle.

@@
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry_safe;
@@

T *I1;
+ T *tmp;
...
- while (list_empty(&E1) == 0)
+ list_for_each_entry_safe (I1, tmp, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...
}

Signed-off-by: simran singhal <singhalsimran0@...il.com>
---
 drivers/staging/lustre/lustre/osc/osc_cache.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index f8c5fc0..caa5fec 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -1996,6 +1996,7 @@ static unsigned int get_write_extents(struct osc_object *obj,
 {
 	struct client_obd *cli = osc_cli(obj);
 	struct osc_extent *ext;
+	struct osc_extent *tmp;
 	struct osc_extent *temp;
 	struct extent_rpc_data data = {
 		.erd_rpc_list = rpclist,
@@ -2014,9 +2015,7 @@ static unsigned int get_write_extents(struct osc_object *obj,
 	if (data.erd_page_count == data.erd_max_pages)
 		return data.erd_page_count;
 
-	while (!list_empty(&obj->oo_urgent_exts)) {
-		ext = list_entry(obj->oo_urgent_exts.next,
-				 struct osc_extent, oe_link);
+	list_for_each_entry_safe(ext, tmp, &obj->oo_urgent_exts, oe_link) {
 		if (!try_to_add_extent_for_io(cli, ext, &data))
 			return data.erd_page_count;
 
-- 
2.7.4