diff options
Diffstat (limited to 'drivers/block/zram/zram_drv.c')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 59 |
1 files changed, 24 insertions, 35 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index bca33403fc8b..af679375b193 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -549,7 +549,7 @@ static ssize_t bd_stat_show(struct device *dev, struct device_attribute *attr, return ret; } -static ssize_t writeback_compressed_store(struct device *dev, +static ssize_t compressed_writeback_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { @@ -564,12 +564,12 @@ static ssize_t writeback_compressed_store(struct device *dev, return -EBUSY; } - zram->wb_compressed = val; + zram->compressed_wb = val; return len; } -static ssize_t writeback_compressed_show(struct device *dev, +static ssize_t compressed_writeback_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -577,7 +577,7 @@ static ssize_t writeback_compressed_show(struct device *dev, struct zram *zram = dev_to_zram(dev); guard(rwsem_read)(&zram->dev_lock); - val = zram->wb_compressed; + val = zram->compressed_wb; return sysfs_emit(buf, "%d\n", val); } @@ -917,9 +917,8 @@ static void zram_account_writeback_submit(struct zram *zram) static int zram_writeback_complete(struct zram *zram, struct zram_wb_req *req) { - u32 size, index = req->pps->index; - int err, prio; - bool huge; + u32 index = req->pps->index; + int err; err = blk_status_to_errno(req->bio.bi_status); if (err) { @@ -946,28 +945,13 @@ static int zram_writeback_complete(struct zram *zram, struct zram_wb_req *req) goto out; } - if (zram->wb_compressed) { - /* - * ZRAM_WB slots get freed, we need to preserve data required - * for read decompression. - */ - size = get_slot_size(zram, index); - prio = get_slot_comp_priority(zram, index); - huge = test_slot_flag(zram, index, ZRAM_HUGE); - } - - slot_free(zram, index); - set_slot_flag(zram, index, ZRAM_WB); + clear_slot_flag(zram, index, ZRAM_IDLE); + if (test_slot_flag(zram, index, ZRAM_HUGE)) + atomic64_dec(&zram->stats.huge_pages); + atomic64_sub(get_slot_size(zram, index), &zram->stats.compr_data_size); + zs_free(zram->mem_pool, get_slot_handle(zram, index)); set_slot_handle(zram, index, req->blk_idx); - - if (zram->wb_compressed) { - if (huge) - set_slot_flag(zram, index, ZRAM_HUGE); - set_slot_size(zram, index, size); - set_slot_comp_priority(zram, index, prio); - } - - atomic64_inc(&zram->stats.pages_stored); + set_slot_flag(zram, index, ZRAM_WB); out: slot_unlock(zram, index); @@ -1100,7 +1084,7 @@ static int zram_writeback_slots(struct zram *zram, */ if (!test_slot_flag(zram, index, ZRAM_PP_SLOT)) goto next; - if (zram->wb_compressed) + if (zram->compressed_wb) err = read_from_zspool_raw(zram, req->page, index); else err = read_from_zspool(zram, req->page, index); @@ -1429,7 +1413,7 @@ static void zram_async_read_endio(struct bio *bio) * * Keep the existing behavior for now. */ - if (zram->wb_compressed == false) { + if (zram->compressed_wb == false) { /* No decompression needed, complete the parent IO */ bio_endio(req->parent); bio_put(bio); @@ -1508,7 +1492,7 @@ static int read_from_bdev_sync(struct zram *zram, struct page *page, u32 index, flush_work(&req.work); destroy_work_on_stack(&req.work); - if (req.error || zram->wb_compressed == false) + if (req.error || zram->compressed_wb == false) return req.error; return decompress_bdev_page(zram, page, index); @@ -2010,8 +1994,13 @@ static void slot_free(struct zram *zram, u32 index) set_slot_comp_priority(zram, index, 0); if (test_slot_flag(zram, index, ZRAM_HUGE)) { + /* + * Writeback completion decrements ->huge_pages but keeps + * ZRAM_HUGE flag for deferred decompression path. + */ + if (!test_slot_flag(zram, index, ZRAM_WB)) + atomic64_dec(&zram->stats.huge_pages); clear_slot_flag(zram, index, ZRAM_HUGE); - atomic64_dec(&zram->stats.huge_pages); } if (test_slot_flag(zram, index, ZRAM_WB)) { @@ -3007,7 +2996,7 @@ static DEVICE_ATTR_WO(writeback); static DEVICE_ATTR_RW(writeback_limit); static DEVICE_ATTR_RW(writeback_limit_enable); static DEVICE_ATTR_RW(writeback_batch_size); -static DEVICE_ATTR_RW(writeback_compressed); +static DEVICE_ATTR_RW(compressed_writeback); #endif #ifdef CONFIG_ZRAM_MULTI_COMP static DEVICE_ATTR_RW(recomp_algorithm); @@ -3031,7 +3020,7 @@ static struct attribute *zram_disk_attrs[] = { &dev_attr_writeback_limit.attr, &dev_attr_writeback_limit_enable.attr, &dev_attr_writeback_batch_size.attr, - &dev_attr_writeback_compressed.attr, + &dev_attr_compressed_writeback.attr, #endif &dev_attr_io_stat.attr, &dev_attr_mm_stat.attr, @@ -3091,7 +3080,7 @@ static int zram_add(void) init_rwsem(&zram->dev_lock); #ifdef CONFIG_ZRAM_WRITEBACK zram->wb_batch_size = 32; - zram->wb_compressed = false; + zram->compressed_wb = false; #endif /* gendisk structure */ |