From 643ae61d0f41c48aa7179921fe15ba4b4d8ddfec Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@kernel.org>
Date: Wed, 3 May 2017 14:55:50 -0700
Subject: zram: introduce zram data accessor
With element, sometime I got confused handle and element access. It
might be my bad but I think it's time to introduce accessor to prevent
future idiot like me. This patch is just clean-up patch so it shouldn't
change any behavior.
Link: http://lkml.kernel.org/r/1492052365-16169-6-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
drivers/block/zram/zram_drv.c | 33 ++++++++++++++++++++++-----------
1 file changed, 22 insertions(+), 11 deletions(-)
(limited to 'drivers/block')
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index c674d23539b1..61b0f8374222 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -57,6 +57,16 @@ static inline struct zram *dev_to_zram(struct device *dev)
return (struct zram *)dev_to_disk(dev)->private_data;
}
+static unsigned long zram_get_handle(struct zram *zram, u32 index)
+{
+ return zram->table[index].handle;
+}
+
+static void zram_set_handle(struct zram *zram, u32 index, unsigned long handle)
+{
+ zram->table[index].handle = handle;
+}
+
/* flag operations require table entry bit_spin_lock() being held */
static int zram_test_flag(struct zram *zram, u32 index,
enum zram_pageflags flag)
@@ -82,9 +92,9 @@ static inline void zram_set_element(struct zram *zram, u32 index,
zram->table[index].element = element;
}
-static inline void zram_clear_element(struct zram *zram, u32 index)
+static unsigned long zram_get_element(struct zram *zram, u32 index)
{
- zram->table[index].element = 0;
+ return zram->table[index].element;
}
static size_t zram_get_obj_size(struct zram *zram, u32 index)
@@ -425,13 +435,14 @@ static bool zram_same_page_read(struct zram *zram, u32 index,
unsigned int offset, unsigned int len)
{
zram_slot_lock(zram, index);
- if (unlikely(!zram->table[index].handle) ||
- zram_test_flag(zram, index, ZRAM_SAME)) {
+ if (unlikely(!zram_get_handle(zram, index) ||
+ zram_test_flag(zram, index, ZRAM_SAME))) {
void *mem;
zram_slot_unlock(zram, index);
mem = kmap_atomic(page);
- zram_fill_page(mem + offset, len, zram->table[index].element);
+ zram_fill_page(mem + offset, len,
+ zram_get_element(zram, index));
kunmap_atomic(mem);
return true;
}
@@ -470,7 +481,7 @@ static void zram_meta_free(struct zram *zram, u64 disksize)
/* Free all pages that are still in this zram device */
for (index = 0; index < num_pages; index++) {
- unsigned long handle = zram->table[index].handle;
+ unsigned long handle = zram_get_handle(zram, index);
/*
* No memory is allocated for same element filled pages.
* Simply clear same page flag.
@@ -510,7 +521,7 @@ static bool zram_meta_alloc(struct zram *zram, u64 disksize)
*/
static void zram_free_page(struct zram *zram, size_t index)
{
- unsigned long handle = zram->table[index].handle;
+ unsigned long handle = zram_get_handle(zram, index);
/*
* No memory is allocated for same element filled pages.
@@ -518,7 +529,7 @@ static void zram_free_page(struct zram *zram, size_t index)
*/
if (zram_test_flag(zram, index, ZRAM_SAME)) {
zram_clear_flag(zram, index, ZRAM_SAME);
- zram_clear_element(zram, index);
+ zram_set_element(zram, index, 0);
atomic64_dec(&zram->stats.same_pages);
return;
}
@@ -532,7 +543,7 @@ static void zram_free_page(struct zram *zram, size_t index)
&zram->stats.compr_data_size);
atomic64_dec(&zram->stats.pages_stored);
- zram->table[index].handle = 0;
+ zram_set_handle(zram, index, 0);
zram_set_obj_size(zram, index, 0);
}
@@ -547,7 +558,7 @@ static int zram_decompress_page(struct zram *zram, struct page *page, u32 index)
return 0;
zram_slot_lock(zram, index);
- handle = zram->table[index].handle;
+ handle = zram_get_handle(zram, index);
size = zram_get_obj_size(zram, index);
src = zs_map_object(zram->mem_pool, handle, ZS_MM_RO);
@@ -713,7 +724,7 @@ static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index)
*/
zram_slot_lock(zram, index);
zram_free_page(zram, index);
- zram->table[index].handle = handle;
+ zram_set_handle(zram, index, handle);
zram_set_obj_size(zram, index, comp_len);
zram_slot_unlock(zram, index);
--
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