From 586f61682816f0cf7865b2dab7210b8f5339f834 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 29 Nov 2021 11:21:39 +0100 Subject: [PATCH] dax: remove the pgmap sanity checks in generic_fsdax_supported Drivers that register a dax_dev should make sure it works, no need to double check from the file system. Signed-off-by: Christoph Hellwig Reviewed-by: Dan Williams Reviewed-by: Darrick J. Wong Link: https://lore.kernel.org/r/20211129102203.2243509-6-hch@lst.de Signed-off-by: Dan Williams --- drivers/dax/super.c | 49 +------------------------------------------------ 1 file changed, 1 insertion(+), 48 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index bf77c3d..c8500b7 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -106,13 +106,9 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, struct block_device *bdev, int blocksize, sector_t start, sector_t sectors) { - bool dax_enabled = false; pgoff_t pgoff, pgoff_end; - void *kaddr, *end_kaddr; - pfn_t pfn, end_pfn; sector_t last_page; - long len, len2; - int err, id; + int err; if (blocksize != PAGE_SIZE) { pr_info("%pg: error: unsupported blocksize for dax\n", bdev); @@ -137,49 +133,6 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, return false; } - id = dax_read_lock(); - len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); - len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn); - - if (len < 1 || len2 < 1) { - pr_info("%pg: error: dax access failed (%ld)\n", - bdev, len < 1 ? len : len2); - dax_read_unlock(id); - return false; - } - - if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) { - /* - * An arch that has enabled the pmem api should also - * have its drivers support pfn_t_devmap() - * - * This is a developer warning and should not trigger in - * production. dax_flush() will crash since it depends - * on being able to do (page_address(pfn_to_page())). - */ - WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API)); - dax_enabled = true; - } else if (pfn_t_devmap(pfn) && pfn_t_devmap(end_pfn)) { - struct dev_pagemap *pgmap, *end_pgmap; - - pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL); - end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL); - if (pgmap && pgmap == end_pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX - && pfn_t_to_page(pfn)->pgmap == pgmap - && pfn_t_to_page(end_pfn)->pgmap == pgmap - && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr)) - && pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr))) - dax_enabled = true; - put_dev_pagemap(pgmap); - put_dev_pagemap(end_pgmap); - - } - dax_read_unlock(id); - - if (!dax_enabled) { - pr_info("%pg: error: dax support not enabled\n", bdev); - return false; - } return true; } EXPORT_SYMBOL_GPL(generic_fsdax_supported); -- 2.7.4