[PATCH v1 2/9] zram: inlining zram_compress

Minchan Kim
2017-06-26T06:54:44Z

zram_compress does several things, compress, entry alloc and check
limitation. I did for just readbility but it hurts modulization.:(
So this patch removes zram_compress functions and inline it in
__zram_bvec_write for upcoming patches.

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
drivers/block/zram/zram_drv.c | 64 +++++++++++++++----------------------------
1 file changed, 22 insertions(+), 42 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 5d3ea405..8138822 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -589,25 +589,38 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
return ret;
}

-static int zram_compress(struct zram *zram, struct zcomp_strm **zstrm,
- struct page *page,
- unsigned long *out_handle, unsigned int *out_comp_len)
+static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index)
{
int ret;
- unsigned int comp_len;
- void *src;
unsigned long alloced_pages;
unsigned long handle = 0;
+ unsigned int comp_len = 0;
+ void *src, *dst, *mem;
+ struct zcomp_strm *zstrm;
+ struct page *page = bvec->bv_page;
+ unsigned long element = 0;
+ enum zram_pageflags flags = 0;
+
+ mem = kmap_atomic(page);
+ if (page_same_filled(mem, &element)) {
+ kunmap_atomic(mem);
+ /* Free memory associated with this sector now. */
+ flags = ZRAM_SAME;
+ atomic64_inc(&zram->stats.same_pages);
+ goto out;
+ }
+ kunmap_atomic(mem);

compress_again:
+ zstrm = zcomp_stream_get(zram->comp);
src = kmap_atomic(page);
- ret = zcomp_compress(*zstrm, src, &comp_len);
+ ret = zcomp_compress(zstrm, src, &comp_len);
kunmap_atomic(src);

if (unlikely(ret)) {
+ zcomp_stream_put(zram->comp);
pr_err("Compression failed! err=%d\n", ret);
- if (handle)
- zs_free(zram->mem_pool, handle);
+ zs_free(zram->mem_pool, handle);
return ret;
}

@@ -639,7 +652,6 @@ static int zram_compress(struct zram *zram, struct zcomp_strm **zstrm,
handle = zs_malloc(zram->mem_pool, comp_len,
GFP_NOIO | __GFP_HIGHMEM |
__GFP_MOVABLE);
- *zstrm = zcomp_stream_get(zram->comp);
if (handle)
goto compress_again;
return -ENOMEM;
@@ -649,43 +661,11 @@ static int zram_compress(struct zram *zram, struct zcomp_strm **zstrm,
update_used_max(zram, alloced_pages);

if (zram->limit_pages && alloced_pages > zram->limit_pages) {
+ zcomp_stream_put(zram->comp);
zs_free(zram->mem_pool, handle);
return -ENOMEM;
}

- *out_handle = handle;
- *out_comp_len = comp_len;
- return 0;
-}
-
-static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index)
-{
- int ret;
- unsigned long handle = 0;
- unsigned int comp_len = 0;
- void *src, *dst, *mem;
- struct zcomp_strm *zstrm;
- struct page *page = bvec->bv_page;
- unsigned long element = 0;
- enum zram_pageflags flags = 0;
-
- mem = kmap_atomic(page);
- if (page_same_filled(mem, &element)) {
- kunmap_atomic(mem);
- /* Free memory associated with this sector now */
- atomic64_inc(&zram->stats.same_pages);
- flags = ZRAM_SAME;
- goto out;
- }
- kunmap_atomic(mem);
-
- zstrm = zcomp_stream_get(zram->comp);
- ret = zram_compress(zram, &zstrm, page, &handle, &comp_len);
- if (ret) {
- zcomp_stream_put(zram->comp);
- return ret;
- }
-
dst = zs_map_object(zram->mem_pool, handle, ZS_MM_WO);

src = zstrm->buffer;
--
2.7.4