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zram: inline zram_compress

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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.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Cc: Juneho Choi <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2017-09-06 16:19:47 -07:00 • committed by Linus Torvalds
commit 97ec7c8bd5
1 changed files with 22 additions and 42 deletions
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64
drivers/block/zram/zram_drv.c
View file

@ -589,25 +589,38 @@ out:
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 @@ compress_again:
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 @@ compress_again:
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;