From be257c61306750d11c20d2ac567bf63304c696a3 Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Mon, 7 Apr 2014 15:38:01 -0700 Subject: [PATCH] zram: do not pass rw argument to __zram_make_request() Do not pass rw argument down the __zram_make_request() -> zram_bvec_rw() chain, decode it in zram_bvec_rw() instead. Besides, this is the place where we distinguish READ and WRITE bio data directions, so account zram RW stats here, instead of __zram_make_request(). This also allows to account a real number of zram READ/WRITE operations, not just requests (single RW request may cause a number of zram RW ops with separate locking, compression/decompression, etc). Signed-off-by: Sergey Senozhatsky Acked-by: Minchan Kim Acked-by: Jerome Marchand Cc: Nitin Gupta Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/block/zram/zram_drv.c | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index b3e6f07..3f0d6de 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -533,14 +533,18 @@ out: } static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index, - int offset, struct bio *bio, int rw) + int offset, struct bio *bio) { int ret; + int rw = bio_data_dir(bio); - if (rw == READ) + if (rw == READ) { + atomic64_inc(&zram->stats.num_reads); ret = zram_bvec_read(zram, bvec, index, offset, bio); - else + } else { + atomic64_inc(&zram->stats.num_writes); ret = zram_bvec_write(zram, bvec, index, offset); + } return ret; } @@ -672,22 +676,13 @@ out: return ret; } -static void __zram_make_request(struct zram *zram, struct bio *bio, int rw) +static void __zram_make_request(struct zram *zram, struct bio *bio) { int offset; u32 index; struct bio_vec bvec; struct bvec_iter iter; - switch (rw) { - case READ: - atomic64_inc(&zram->stats.num_reads); - break; - case WRITE: - atomic64_inc(&zram->stats.num_writes); - break; - } - index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; offset = (bio->bi_iter.bi_sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; @@ -706,16 +701,15 @@ static void __zram_make_request(struct zram *zram, struct bio *bio, int rw) bv.bv_len = max_transfer_size; bv.bv_offset = bvec.bv_offset; - if (zram_bvec_rw(zram, &bv, index, offset, bio, rw) < 0) + if (zram_bvec_rw(zram, &bv, index, offset, bio) < 0) goto out; bv.bv_len = bvec.bv_len - max_transfer_size; bv.bv_offset += max_transfer_size; - if (zram_bvec_rw(zram, &bv, index+1, 0, bio, rw) < 0) + if (zram_bvec_rw(zram, &bv, index + 1, 0, bio) < 0) goto out; } else - if (zram_bvec_rw(zram, &bvec, index, offset, bio, rw) - < 0) + if (zram_bvec_rw(zram, &bvec, index, offset, bio) < 0) goto out; update_position(&index, &offset, &bvec); @@ -745,7 +739,7 @@ static void zram_make_request(struct request_queue *queue, struct bio *bio) goto error; } - __zram_make_request(zram, bio, bio_data_dir(bio)); + __zram_make_request(zram, bio); up_read(&zram->init_lock); return; -- 2.7.4