lkml.org 
[lkml]   [2017]   [Apr]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/6] zram: use zram_slot_lock instead of raw bit_spin_lock op
Date
With this clean-up phase, I want to use zram's wrapper function
to lock table access which is more consistent with other zram's
functions.

Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
drivers/block/zram/zram_drv.c | 41 +++++++++++++++++++++++++++--------------
1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index c4445995fd13..931fe099dbc8 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -415,24 +415,38 @@ static DEVICE_ATTR_RO(io_stat);
static DEVICE_ATTR_RO(mm_stat);
static DEVICE_ATTR_RO(debug_stat);

+static void zram_slot_lock(struct zram *zram, u32 index)
+{
+ struct zram_meta *meta = zram->meta;
+
+ bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+}
+
+static void zram_slot_unlock(struct zram *zram, u32 index)
+{
+ struct zram_meta *meta = zram->meta;
+
+ bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+}
+
static bool zram_same_page_read(struct zram *zram, u32 index,
struct page *page,
unsigned int offset, unsigned int len)
{
struct zram_meta *meta = zram->meta;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
if (unlikely(!meta->table[index].handle) ||
zram_test_flag(meta, index, ZRAM_SAME)) {
void *mem;

- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
mem = kmap_atomic(page);
zram_fill_page(mem + offset, len, meta->table[index].element);
kunmap_atomic(mem);
return true;
}
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);

return false;
}
@@ -448,11 +462,11 @@ static bool zram_same_page_write(struct zram *zram, u32 index,

kunmap_atomic(mem);
/* Free memory associated with this sector now. */
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
zram_set_flag(meta, index, ZRAM_SAME);
zram_set_element(meta, index, element);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);

atomic64_inc(&zram->stats.same_pages);
return true;
@@ -559,7 +573,7 @@ static int zram_decompress_page(struct zram *zram, struct page *page, u32 index)
if (zram_same_page_read(zram, index, page, 0, PAGE_SIZE))
return 0;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
handle = meta->table[index].handle;
size = zram_get_obj_size(meta, index);

@@ -578,7 +592,7 @@ static int zram_decompress_page(struct zram *zram, struct page *page, u32 index)
zcomp_stream_put(zram->comp);
}
zs_unmap_object(meta->mem_pool, handle);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);

/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret))
@@ -727,11 +741,11 @@ static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index)
* Free memory associated with this sector
* before overwriting unused sectors.
*/
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
meta->table[index].handle = handle;
zram_set_obj_size(meta, index, comp_len);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);

/* Update stats */
atomic64_add(comp_len, &zram->stats.compr_data_size);
@@ -789,7 +803,6 @@ static void zram_bio_discard(struct zram *zram, u32 index,
int offset, struct bio *bio)
{
size_t n = bio->bi_iter.bi_size;
- struct zram_meta *meta = zram->meta;

/*
* zram manages data in physical block size units. Because logical block
@@ -810,9 +823,9 @@ static void zram_bio_discard(struct zram *zram, u32 index,
}

while (n >= PAGE_SIZE) {
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.notify_free);
index++;
n -= PAGE_SIZE;
@@ -922,9 +935,9 @@ static void zram_slot_free_notify(struct block_device *bdev,
zram = bdev->bd_disk->private_data;
meta = zram->meta;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_lock(zram, index);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.notify_free);
}

--
2.7.4
\
 
 \ /
  Last update: 2017-04-13 05:01    [W:0.062 / U:16.604 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site