On (08/20/15 15:35), Joonsoo Kim wrote:
zram regards zstrm's buffer as compression destination buffer, but,
it is not intuitive and there is no document about it. Providing
destination buffer to zcomp_compress() directly seems more intuitive
interface to me so this patch changes zcomp_compress interface.
Signed-off-by: Joonsoo Kim iamjoonsoo@lge.com
---
drivers/block/zram/zcomp.c| 5 ++---
drivers/block/zram/zcomp.h| 2 +-
drivers/block/zram/zram_drv.c | 2 +-
3 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 965d1af..2ad504b 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -307,10 +307,9 @@ void zcomp_strm_release(struct zcomp *comp, struct
zcomp_strm *zstrm)
}
int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
- const unsigned char *src, size_t *dst_len)
+ const unsigned char *src, unsigned char *dst, size_t *dst_len)
{
- return comp-backend-compress(src, zstrm-buffer, dst_len,
- zstrm-private);
+ return comp-backend-compress(src, dst, dst_len, zstrm-private);
}
int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index 46e2b9f..b2388e0 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -60,7 +60,7 @@ struct zcomp_strm *zcomp_strm_find(struct zcomp *comp);
void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm);
int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
- const unsigned char *src, size_t *dst_len);
+ const unsigned char *src, unsigned char *dst, size_t *dst_len);
int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
size_t src_len, unsigned char *dst);
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index b088ca9..4801e4d 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -701,7 +701,7 @@ static int zram_bvec_write(struct zram *zram, struct
bio_vec *bvec, u32 index,
goto out;
}
- ret = zcomp_compress(zram-comp, zstrm, uncmem, clen);
+ ret = zcomp_compress(zram-comp, zstrm, uncmem, zstrm-buffer, clen);
No, this change is unreasonable. zcomp might want to do with zstrm
anything it wants to, because zstrm belongs there. Besides, you change
zcomp_decompress() to require `struct zcomp_strm *zstrm', so let's
stick with this -- pass `struct zcomp_strm *zstrm' to both compress and
decompress functions. It's up to zcomp to ignore passed zstrm or do
something sane; not up to zram_drv.
-ss
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