zcache: Provide accessory functions for counter increase

This is the first step in moving the debugfs code out of the
main file in-to another file. And also allow the code to run
without CONFIG_DEBUG_FS defined.

Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
[v2: Rebase on top staging/zcache: Fix/improve zcache writeback code, tie to a config option]
[v3: Rebase on top of zcache: Fix compile warnings due to usage of debugfs_create_size_t]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index d7dd02c..a3c5b7d 100644 (file)
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -139,32 +139,87 @@ static ssize_t zcache_obj_count;
 static atomic_t zcache_obj_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_obj_count_max;
 static ssize_t zcache_objnode_count;
+static inline void inc_zcache_obj_count(void)
+{
+       zcache_obj_count = atomic_inc_return(&zcache_obj_atomic);
+       if (zcache_obj_count > zcache_obj_count_max)
+               zcache_obj_count_max = zcache_obj_count;
+}
+
 static atomic_t zcache_objnode_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_objnode_count_max;
+static inline void inc_zcache_objnode_count(void)
+{
+       zcache_objnode_count = atomic_inc_return(&zcache_objnode_atomic);
+       if (zcache_objnode_count > zcache_objnode_count_max)
+               zcache_objnode_count_max = zcache_objnode_count;
+};
 static u64 zcache_eph_zbytes;
 static atomic_long_t zcache_eph_zbytes_atomic = ATOMIC_INIT(0);
 static u64 zcache_eph_zbytes_max;
+static inline void inc_zcache_eph_zbytes(unsigned clen)
+{
+       zcache_eph_zbytes = atomic_long_add_return(clen, &zcache_eph_zbytes_atomic);
+       if (zcache_eph_zbytes > zcache_eph_zbytes_max)
+               zcache_eph_zbytes_max = zcache_eph_zbytes;
+};
 static u64 zcache_pers_zbytes;
 static atomic_long_t zcache_pers_zbytes_atomic = ATOMIC_INIT(0);
 static u64 zcache_pers_zbytes_max;
 static ssize_t zcache_eph_pageframes;
+static inline void inc_zcache_pers_zbytes(unsigned clen)
+{
+       zcache_pers_zbytes = atomic_long_add_return(clen, &zcache_pers_zbytes_atomic);
+       if (zcache_pers_zbytes > zcache_pers_zbytes_max)
+               zcache_pers_zbytes_max = zcache_pers_zbytes;
+}
 static atomic_t zcache_eph_pageframes_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_eph_pageframes_max;
 static ssize_t zcache_pers_pageframes;
+static inline void inc_zcache_eph_pageframes(void)
+{
+       zcache_eph_pageframes = atomic_inc_return(&zcache_eph_pageframes_atomic);
+       if (zcache_eph_pageframes > zcache_eph_pageframes_max)
+               zcache_eph_pageframes_max = zcache_eph_pageframes;
+};
 static atomic_t zcache_pers_pageframes_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_pers_pageframes_max;
 static ssize_t zcache_pageframes_alloced;
+static inline void inc_zcache_pers_pageframes(void)
+{
+       zcache_pers_pageframes = atomic_inc_return(&zcache_pers_pageframes_atomic);
+       if (zcache_pers_pageframes > zcache_pers_pageframes_max)
+               zcache_pers_pageframes_max = zcache_pers_pageframes;
+}
 static atomic_t zcache_pageframes_alloced_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_pageframes_freed;
+static inline void inc_zcache_pageframes_alloced(void)
+{
+       zcache_pageframes_alloced = atomic_inc_return(&zcache_pageframes_alloced_atomic);
+};
 static atomic_t zcache_pageframes_freed_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_eph_zpages;
-static ssize_t zcache_eph_zpages;
+static inline void inc_zcache_pageframes_freed(void)
+{
+       zcache_pageframes_freed = atomic_inc_return(&zcache_pageframes_freed_atomic);
+}
 static atomic_t zcache_eph_zpages_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_eph_zpages_max;
 static ssize_t zcache_pers_zpages;
+static inline void inc_zcache_eph_zpages(void)
+{
+       zcache_eph_zpages = atomic_inc_return(&zcache_eph_zpages_atomic);
+       if (zcache_eph_zpages > zcache_eph_zpages_max)
+               zcache_eph_zpages_max = zcache_eph_zpages;
+}
 static atomic_t zcache_pers_zpages_atomic = ATOMIC_INIT(0);
 static ssize_t zcache_pers_zpages_max;
-
+static inline void inc_zcache_pers_zpages(void)
+{
+       zcache_pers_zpages = atomic_inc_return(&zcache_pers_zpages_atomic);
+       if (zcache_pers_zpages > zcache_pers_zpages_max)
+               zcache_pers_zpages_max = zcache_pers_zpages;
+}
 /* but for the rest of these, counting races are ok */
 static ssize_t zcache_flush_total;
 static ssize_t zcache_flush_found;
@@ -422,9 +477,7 @@ static struct tmem_objnode *zcache_objnode_alloc(struct tmem_pool *pool)
                }
        }
        BUG_ON(objnode == NULL);
-       zcache_objnode_count = atomic_inc_return(&zcache_objnode_atomic);
-       if (zcache_objnode_count > zcache_objnode_count_max)
-               zcache_objnode_count_max = zcache_objnode_count;
+       inc_zcache_objnode_count();
        return objnode;
 }
 
@@ -446,9 +499,7 @@ static struct tmem_obj *zcache_obj_alloc(struct tmem_pool *pool)
        obj = kp->obj;
        BUG_ON(obj == NULL);
        kp->obj = NULL;
-       zcache_obj_count = atomic_inc_return(&zcache_obj_atomic);
-       if (zcache_obj_count > zcache_obj_count_max)
-               zcache_obj_count_max = zcache_obj_count;
+       inc_zcache_obj_count();
        return obj;
 }
 
@@ -472,8 +523,7 @@ static struct page *zcache_alloc_page(void)
        struct page *page = alloc_page(ZCACHE_GFP_MASK);
 
        if (page != NULL)
-               zcache_pageframes_alloced =
-                       atomic_inc_return(&zcache_pageframes_alloced_atomic);
+               inc_zcache_pageframes_alloced();
        return page;
 }
 
@@ -485,8 +535,7 @@ static void zcache_free_page(struct page *page)
        if (page == NULL)
                BUG();
        __free_page(page);
-       zcache_pageframes_freed =
-               atomic_inc_return(&zcache_pageframes_freed_atomic);
+       inc_zcache_pageframes_freed();
        curr_pageframes = zcache_pageframes_alloced -
                        atomic_read(&zcache_pageframes_freed_atomic) -
                        atomic_read(&zcache_eph_pageframes_atomic) -
@@ -551,19 +600,11 @@ static void *zcache_pampd_eph_create(char *data, size_t size, bool raw,
 create_in_new_page:
        pampd = (void *)zbud_create_prep(th, true, cdata, clen, newpage);
        BUG_ON(pampd == NULL);
-       zcache_eph_pageframes =
-               atomic_inc_return(&zcache_eph_pageframes_atomic);
-       if (zcache_eph_pageframes > zcache_eph_pageframes_max)
-               zcache_eph_pageframes_max = zcache_eph_pageframes;
+       inc_zcache_eph_pageframes();
 
 got_pampd:
-       zcache_eph_zbytes =
-               atomic_long_add_return(clen, &zcache_eph_zbytes_atomic);
-       if (zcache_eph_zbytes > zcache_eph_zbytes_max)
-               zcache_eph_zbytes_max = zcache_eph_zbytes;
-       zcache_eph_zpages = atomic_inc_return(&zcache_eph_zpages_atomic);
-       if (zcache_eph_zpages > zcache_eph_zpages_max)
-               zcache_eph_zpages_max = zcache_eph_zpages;
+       inc_zcache_eph_zbytes(clen);
+       inc_zcache_eph_zpages();
        if (ramster_enabled && raw)
                ramster_count_foreign_pages(true, 1);
 out:
@@ -633,19 +674,11 @@ create_pampd:
 create_in_new_page:
        pampd = (void *)zbud_create_prep(th, false, cdata, clen, newpage);
        BUG_ON(pampd == NULL);
-       zcache_pers_pageframes =
-               atomic_inc_return(&zcache_pers_pageframes_atomic);
-       if (zcache_pers_pageframes > zcache_pers_pageframes_max)
-               zcache_pers_pageframes_max = zcache_pers_pageframes;
+       inc_zcache_pers_pageframes();
 
 got_pampd:
-       zcache_pers_zpages = atomic_inc_return(&zcache_pers_zpages_atomic);
-       if (zcache_pers_zpages > zcache_pers_zpages_max)
-               zcache_pers_zpages_max = zcache_pers_zpages;
-       zcache_pers_zbytes =
-               atomic_long_add_return(clen, &zcache_pers_zbytes_atomic);
-       if (zcache_pers_zbytes > zcache_pers_zbytes_max)
-               zcache_pers_zbytes_max = zcache_pers_zbytes;
+       inc_zcache_pers_zpages();
+       inc_zcache_pers_zbytes(clen);
        if (ramster_enabled && raw)
                ramster_count_foreign_pages(false, 1);
 out:
@@ -991,6 +1024,11 @@ out:
 
 static atomic_t zcache_outstanding_writeback_pages_atomic = ATOMIC_INIT(0);
 
+static inline void inc_zcache_outstanding_writeback_pages(void)
+{
+       zcache_outstanding_writeback_pages =
+           atomic_inc_return(&zcache_outstanding_writeback_pages_atomic);
+}
 static void unswiz(struct tmem_oid oid, u32 index,
                                unsigned *type, pgoff_t *offset);
 
@@ -1120,8 +1158,7 @@ static int zcache_frontswap_writeback_zpage(int type, pgoff_t offset,
         */
        (void)__swap_writepage(page, &wbc, zcache_end_swap_write);
        page_cache_release(page);
-       zcache_outstanding_writeback_pages =
-           atomic_inc_return(&zcache_outstanding_writeback_pages_atomic);
+       inc_zcache_outstanding_writeback_pages();
 
        return 0;
 }