staging: lustre: osc_cache: 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: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index 2e45255..6336311 100644 (file)
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -1905,13 +1905,12 @@ static int get_write_extents(struct osc_object *obj, struct list_head *rpclist)
 {
        struct client_obd *cli = osc_cli(obj);
        struct osc_extent *ext;
+       struct osc_extent *temp;
        int page_count = 0;
        unsigned int max_pages = cli->cl_max_pages_per_rpc;
 
        LASSERT(osc_object_is_locked(obj));
-       while (!list_empty(&obj->oo_hp_exts)) {
-               ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
-                                oe_link);
+       list_for_each_entry_safe(ext, temp, &obj->oo_hp_exts, oe_link) {
                LASSERT(ext->oe_state == OES_CACHE);
                if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
                                              &max_pages))
@@ -2667,6 +2666,7 @@ int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
 {
        struct client_obd *cli = osc_cli(obj);
        struct osc_extent *ext;
+       struct osc_extent *temp;
        struct osc_extent *waiting = NULL;
        pgoff_t index;
        LIST_HEAD(list);
@@ -2726,10 +2726,9 @@ again:
 
        osc_list_maint(cli, obj);
 
-       while (!list_empty(&list)) {
+       list_for_each_entry_safe(ext, temp, &list, oe_link) {
                int rc;
 
-               ext = list_entry(list.next, struct osc_extent, oe_link);
                list_del_init(&ext->oe_link);
 
                /* extent may be in OES_ACTIVE state because inode mutex