diff options
| author | Christoph Hellwig <hch@lst.de> | 2023-04-11 19:14:46 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-19 01:29:57 +0200 |
| commit | af8b04c63708fa730c0257084fab91fb2a9cecc4 (patch) | |
| tree | d36912ad176e9d93b2d7ab783157de2effeab77b /drivers/block | |
| parent | zram: make zram_bio_discard more self-contained (diff) | |
| download | linux-af8b04c63708fa730c0257084fab91fb2a9cecc4.tar.xz linux-af8b04c63708fa730c0257084fab91fb2a9cecc4.zip | |
zram: simplify bvec iteration in __zram_make_request
bio_for_each_segment synthetize bvecs that never cross page boundaries, so
don't duplicate that work in an inner loop.
Link: https://lkml.kernel.org/r/20230411171459.567614-5-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 42 |
1 files changed, 11 insertions, 31 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index e9b31c199027..e13c7d8e283b 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -175,12 +175,6 @@ static inline u32 zram_get_priority(struct zram *zram, u32 index) return prio & ZRAM_COMP_PRIORITY_MASK; } -static void update_position(u32 *index, int *offset, struct bio_vec *bvec) -{ - *index += (*offset + bvec->bv_len) / PAGE_SIZE; - *offset = (*offset + bvec->bv_len) % PAGE_SIZE; -} - static inline void update_used_max(struct zram *zram, const unsigned long pages) { @@ -1960,16 +1954,10 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index, static void __zram_make_request(struct zram *zram, struct bio *bio) { - int offset; - u32 index; - struct bio_vec bvec; struct bvec_iter iter; + struct bio_vec bv; unsigned long start_time; - index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; - offset = (bio->bi_iter.bi_sector & - (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; - switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_WRITE_ZEROES: @@ -1980,24 +1968,16 @@ static void __zram_make_request(struct zram *zram, struct bio *bio) } start_time = bio_start_io_acct(bio); - bio_for_each_segment(bvec, bio, iter) { - struct bio_vec bv = bvec; - unsigned int unwritten = bvec.bv_len; - - do { - bv.bv_len = min_t(unsigned int, PAGE_SIZE - offset, - unwritten); - if (zram_bvec_rw(zram, &bv, index, offset, - bio_op(bio), bio) < 0) { - bio->bi_status = BLK_STS_IOERR; - break; - } - - bv.bv_offset += bv.bv_len; - unwritten -= bv.bv_len; - - update_position(&index, &offset, &bv); - } while (unwritten); + bio_for_each_segment(bv, bio, iter) { + u32 index = iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; + u32 offset = (iter.bi_sector & (SECTORS_PER_PAGE - 1)) << + SECTOR_SHIFT; + + if (zram_bvec_rw(zram, &bv, index, offset, bio_op(bio), + bio) < 0) { + bio->bi_status = BLK_STS_IOERR; + break; + } } bio_end_io_acct(bio, start_time); bio_endio(bio); |