From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: [PATCH 10/14] bdi: remove BDI_CAP_SYNCHRONOUS_IO Date: Fri, 24 Jul 2020 09:33:09 +0200 Message-ID: <20200724073313.138789-11-hch@lst.de> References: <20200724073313.138789-1-hch@lst.de> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200724073313.138789-1-hch@lst.de> Sender: linux-kernel-owner@vger.kernel.org To: Jens Axboe Cc: Song Liu , Hans de Goede , Richard Weinberger , Minchan Kim , linux-mtd@lists.infradead.org, dm-devel@redhat.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, drbd-dev@lists.linbit.com, linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org List-Id: linux-raid.ids BDI_CAP_SYNCHRONOUS_IO is only checked in the swap code, and used to decided if ->rw_page can be used on a block device. Just check up for the method instead. The only complication is that zram needs a second set of block_device_operations as it can switch between modes that actually support ->rw_page and those who don't. Signed-off-by: Christoph Hellwig --- drivers/block/brd.c | 1 - drivers/block/zram/zram_drv.c | 19 +++++++++++++------ drivers/nvdimm/btt.c | 2 -- drivers/nvdimm/pmem.c | 1 - include/linux/backing-dev.h | 9 --------- mm/swapfile.c | 2 +- 6 files changed, 14 insertions(+), 20 deletions(-) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 2723a70eb85593..cc49a921339f77 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -403,7 +403,6 @@ static struct brd_device *brd_alloc(int i) disk->flags = GENHD_FL_EXT_DEVT; sprintf(disk->disk_name, "ram%d", i); set_capacity(disk, rd_size * 2); - brd->brd_queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; /* Tell the block layer that this is not a rotational device */ blk_queue_flag_set(QUEUE_FLAG_NONROT, brd->brd_queue); diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 9100ac36670afc..d73ddf018fa65f 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -52,6 +52,9 @@ static unsigned int num_devices = 1; */ static size_t huge_class_size; +static const struct block_device_operations zram_devops; +static const struct block_device_operations zram_wb_devops; + static void zram_free_page(struct zram *zram, size_t index); static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, u32 index, int offset, struct bio *bio); @@ -408,8 +411,7 @@ static void reset_bdev(struct zram *zram) zram->backing_dev = NULL; zram->old_block_size = 0; zram->bdev = NULL; - zram->disk->queue->backing_dev_info->capabilities |= - BDI_CAP_SYNCHRONOUS_IO; + zram->disk->fops = &zram_devops; kvfree(zram->bitmap); zram->bitmap = NULL; } @@ -528,8 +530,7 @@ static ssize_t backing_dev_store(struct device *dev, * freely but in fact, IO is going on so finally could cause * use-after-free when the IO is really done. */ - zram->disk->queue->backing_dev_info->capabilities &= - ~BDI_CAP_SYNCHRONOUS_IO; + zram->disk->fops = &zram_wb_devops; up_write(&zram->init_lock); pr_info("setup backing device %s\n", file_name); @@ -1819,6 +1820,13 @@ static const struct block_device_operations zram_devops = { .owner = THIS_MODULE }; +static const struct block_device_operations zram_wb_devops = { + .open = zram_open, + .submit_bio = zram_submit_bio, + .swap_slot_free_notify = zram_slot_free_notify, + .owner = THIS_MODULE +}; + static DEVICE_ATTR_WO(compact); static DEVICE_ATTR_RW(disksize); static DEVICE_ATTR_RO(initstate); @@ -1946,8 +1954,7 @@ static int zram_add(void) if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE) blk_queue_max_write_zeroes_sectors(zram->disk->queue, UINT_MAX); - zram->disk->queue->backing_dev_info->capabilities |= - (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); + zram->disk->queue->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; device_add_disk(NULL, zram->disk, zram_disk_attr_groups); strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor)); diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 412d21d8f64351..b4184dc9b41eb4 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -1540,8 +1540,6 @@ static int btt_blk_init(struct btt *btt) btt->btt_disk->private_data = btt; btt->btt_disk->queue = btt->btt_queue; btt->btt_disk->flags = GENHD_FL_EXT_DEVT; - btt->btt_disk->queue->backing_dev_info->capabilities |= - BDI_CAP_SYNCHRONOUS_IO; blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 94790e6e0e4ce1..436b83fb24ad61 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -478,7 +478,6 @@ static int pmem_attach_disk(struct device *dev, disk->queue = q; disk->flags = GENHD_FL_EXT_DEVT; disk->private_data = pmem; - disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; nvdimm_namespace_disk_name(ndns, disk->disk_name); set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) / 512); diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 52583b6f2ea05d..860ea33571bce5 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -122,9 +122,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); * BDI_CAP_NO_WRITEBACK: Don't write pages back * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. - * - * BDI_CAP_SYNCHRONOUS_IO: Device is so fast that asynchronous IO would be - * inefficient. */ #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 #define BDI_CAP_NO_WRITEBACK 0x00000002 @@ -132,7 +129,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); #define BDI_CAP_STABLE_WRITES 0x00000008 #define BDI_CAP_STRICTLIMIT 0x00000010 #define BDI_CAP_CGROUP_WRITEBACK 0x00000020 -#define BDI_CAP_SYNCHRONOUS_IO 0x00000040 #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) @@ -174,11 +170,6 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) long congestion_wait(int sync, long timeout); long wait_iff_congested(int sync, long timeout); -static inline bool bdi_cap_synchronous_io(struct backing_dev_info *bdi) -{ - return bdi->capabilities & BDI_CAP_SYNCHRONOUS_IO; -} - static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) { return bdi->capabilities & BDI_CAP_STABLE_WRITES; diff --git a/mm/swapfile.c b/mm/swapfile.c index 6c26916e95fd4a..18eac97b10e502 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3230,7 +3230,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) if (bdi_cap_stable_pages_required(inode_to_bdi(inode))) p->flags |= SWP_STABLE_WRITES; - if (bdi_cap_synchronous_io(inode_to_bdi(inode))) + if (p->bdev && p->bdev->bd_disk->fops->rw_page) p->flags |= SWP_SYNCHRONOUS_IO; if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) { -- 2.27.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDFB5C433F2 for ; 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bh=kHUw0UuZXh62UTS5LwOFYLvTBhGcGjgSBKOEDgrpN1Q=; b=hsdnbnaWK9ffHqOXxBqqVYPu8i Da9BT76qtRQ8jqWRcJ+EPGNhF8V/gG0hV2T6Sv6Izk4zMbrWO0G9yAEakKoxT9NP2DjE/Ln/om3Qi XLW92YfZ0jcV+JaCdQ1jjaCeQgq5GnlI5KNMsU3eFW3Ox8YQ+Y+6Vts/culYGeCu8XPdVNrP4J91b Y1d2vkVVj5Qsj3FJJy+rwkRgD1vk7kivIOXdHCIhAN32ybVtcpHEJDJ1ed8/8PcbXwauEjHTOJpgi q/A7Tu8R5JRZX371y9PfklMfwz2DRfD8+wIIEjZIwKf1yYO86fv69nFLsSZNwQbbktdwAsGM0k1w0 gju37FXw==; Received: from [2001:4bb8:18c:2acc:8dfe:be3c:592c:efc5] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jysD4-0006Di-L4; Fri, 24 Jul 2020 07:33:39 +0000 From: Christoph Hellwig To: Jens Axboe Subject: [PATCH 10/14] bdi: remove BDI_CAP_SYNCHRONOUS_IO Date: Fri, 24 Jul 2020 09:33:09 +0200 Message-Id: <20200724073313.138789-11-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200724073313.138789-1-hch@lst.de> References: <20200724073313.138789-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-raid@vger.kernel.org, Hans de Goede , Minchan Kim , Richard Weinberger , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Song Liu , dm-devel@redhat.com, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, drbd-dev@lists.linbit.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org BDI_CAP_SYNCHRONOUS_IO is only checked in the swap code, and used to decided if ->rw_page can be used on a block device. Just check up for the method instead. The only complication is that zram needs a second set of block_device_operations as it can switch between modes that actually support ->rw_page and those who don't. Signed-off-by: Christoph Hellwig --- drivers/block/brd.c | 1 - drivers/block/zram/zram_drv.c | 19 +++++++++++++------ drivers/nvdimm/btt.c | 2 -- drivers/nvdimm/pmem.c | 1 - include/linux/backing-dev.h | 9 --------- mm/swapfile.c | 2 +- 6 files changed, 14 insertions(+), 20 deletions(-) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 2723a70eb85593..cc49a921339f77 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -403,7 +403,6 @@ static struct brd_device *brd_alloc(int i) disk->flags = GENHD_FL_EXT_DEVT; sprintf(disk->disk_name, "ram%d", i); set_capacity(disk, rd_size * 2); - brd->brd_queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; /* Tell the block layer that this is not a rotational device */ blk_queue_flag_set(QUEUE_FLAG_NONROT, brd->brd_queue); diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 9100ac36670afc..d73ddf018fa65f 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -52,6 +52,9 @@ static unsigned int num_devices = 1; */ static size_t huge_class_size; +static const struct block_device_operations zram_devops; +static const struct block_device_operations zram_wb_devops; + static void zram_free_page(struct zram *zram, size_t index); static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, u32 index, int offset, struct bio *bio); @@ -408,8 +411,7 @@ static void reset_bdev(struct zram *zram) zram->backing_dev = NULL; zram->old_block_size = 0; zram->bdev = NULL; - zram->disk->queue->backing_dev_info->capabilities |= - BDI_CAP_SYNCHRONOUS_IO; + zram->disk->fops = &zram_devops; kvfree(zram->bitmap); zram->bitmap = NULL; } @@ -528,8 +530,7 @@ static ssize_t backing_dev_store(struct device *dev, * freely but in fact, IO is going on so finally could cause * use-after-free when the IO is really done. */ - zram->disk->queue->backing_dev_info->capabilities &= - ~BDI_CAP_SYNCHRONOUS_IO; + zram->disk->fops = &zram_wb_devops; up_write(&zram->init_lock); pr_info("setup backing device %s\n", file_name); @@ -1819,6 +1820,13 @@ static const struct block_device_operations zram_devops = { .owner = THIS_MODULE }; +static const struct block_device_operations zram_wb_devops = { + .open = zram_open, + .submit_bio = zram_submit_bio, + .swap_slot_free_notify = zram_slot_free_notify, + .owner = THIS_MODULE +}; + static DEVICE_ATTR_WO(compact); static DEVICE_ATTR_RW(disksize); static DEVICE_ATTR_RO(initstate); @@ -1946,8 +1954,7 @@ static int zram_add(void) if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE) blk_queue_max_write_zeroes_sectors(zram->disk->queue, UINT_MAX); - zram->disk->queue->backing_dev_info->capabilities |= - (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); + zram->disk->queue->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; device_add_disk(NULL, zram->disk, zram_disk_attr_groups); strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor)); diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 412d21d8f64351..b4184dc9b41eb4 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -1540,8 +1540,6 @@ static int btt_blk_init(struct btt *btt) btt->btt_disk->private_data = btt; btt->btt_disk->queue = btt->btt_queue; btt->btt_disk->flags = GENHD_FL_EXT_DEVT; - btt->btt_disk->queue->backing_dev_info->capabilities |= - BDI_CAP_SYNCHRONOUS_IO; blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 94790e6e0e4ce1..436b83fb24ad61 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -478,7 +478,6 @@ static int pmem_attach_disk(struct device *dev, disk->queue = q; disk->flags = GENHD_FL_EXT_DEVT; disk->private_data = pmem; - disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; nvdimm_namespace_disk_name(ndns, disk->disk_name); set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) / 512); diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 52583b6f2ea05d..860ea33571bce5 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -122,9 +122,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); * BDI_CAP_NO_WRITEBACK: Don't write pages back * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. - * - * BDI_CAP_SYNCHRONOUS_IO: Device is so fast that asynchronous IO would be - * inefficient. */ #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 #define BDI_CAP_NO_WRITEBACK 0x00000002 @@ -132,7 +129,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); #define BDI_CAP_STABLE_WRITES 0x00000008 #define BDI_CAP_STRICTLIMIT 0x00000010 #define BDI_CAP_CGROUP_WRITEBACK 0x00000020 -#define BDI_CAP_SYNCHRONOUS_IO 0x00000040 #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) @@ -174,11 +170,6 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) long congestion_wait(int sync, long timeout); long wait_iff_congested(int sync, long timeout); -static inline bool bdi_cap_synchronous_io(struct backing_dev_info *bdi) -{ - return bdi->capabilities & BDI_CAP_SYNCHRONOUS_IO; -} - static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) { return bdi->capabilities & BDI_CAP_STABLE_WRITES; diff --git a/mm/swapfile.c b/mm/swapfile.c index 6c26916e95fd4a..18eac97b10e502 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3230,7 +3230,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) if (bdi_cap_stable_pages_required(inode_to_bdi(inode))) p->flags |= SWP_STABLE_WRITES; - if (bdi_cap_synchronous_io(inode_to_bdi(inode))) + if (p->bdev && p->bdev->bd_disk->fops->rw_page) p->flags |= SWP_SYNCHRONOUS_IO; if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) { -- 2.27.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/