From: "Darrick J. Wong" <djwong@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
Mike Snitzer <snitzer@redhat.com>,
Ira Weiny <ira.weiny@intel.com>,
dm-devel@redhat.com, linux-xfs@vger.kernel.org,
nvdimm@lists.linux.dev, linux-s390@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-erofs@lists.ozlabs.org,
linux-ext4@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 05/29] dax: remove the pgmap sanity checks in generic_fsdax_supported
Date: Tue, 30 Nov 2021 10:50:02 -0800 [thread overview]
Message-ID: <20211130185002.GD8467@magnolia> (raw)
In-Reply-To: <20211129102203.2243509-6-hch@lst.de>
On Mon, Nov 29, 2021 at 11:21:39AM +0100, Christoph Hellwig wrote:
> 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 <hch@lst.de>
> Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
--D
> ---
> 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 bf77c3da5d56d..c8500b7e2d8a2 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);
> --
> 2.30.2
>
next prev parent reply other threads:[~2021-11-30 18:50 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 10:21 decouple DAX from block devices v2 Christoph Hellwig
2021-11-29 10:21 ` [PATCH 01/29] dm: fix alloc_dax error handling in alloc_dev Christoph Hellwig
2021-11-29 10:21 ` [PATCH 02/29] dm: make the DAX support depend on CONFIG_FS_DAX Christoph Hellwig
2021-11-29 10:21 ` [PATCH 03/29] dax: remove CONFIG_DAX_DRIVER Christoph Hellwig
2021-11-29 10:21 ` [PATCH 04/29] dax: simplify the dax_device <-> gendisk association Christoph Hellwig
2021-11-30 17:26 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 05/29] dax: remove the pgmap sanity checks in generic_fsdax_supported Christoph Hellwig
2021-11-30 18:50 ` Darrick J. Wong [this message]
2021-11-29 10:21 ` [PATCH 06/29] dax: move the partition alignment check into fs_dax_get_by_bdev Christoph Hellwig
2021-11-30 18:51 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 07/29] xfs: factor out a xfs_setup_dax_always helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 08/29] dax: remove dax_capable Christoph Hellwig
2021-11-29 10:21 ` [PATCH 09/29] dm-linear: add a linear_dax_pgoff helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 10/29] dm-log-writes: add a log_writes_dax_pgoff helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 11/29] dm-stripe: add a stripe_dax_pgoff helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 12/29] fsdax: remove a pointless __force cast in copy_cow_page_dax Christoph Hellwig
2021-11-29 10:21 ` [PATCH 13/29] fsdax: use a saner calling convention for copy_cow_page_dax Christoph Hellwig
2021-11-29 10:21 ` [PATCH 14/29] fsdax: simplify the pgoff calculation Christoph Hellwig
2021-11-29 10:21 ` [PATCH 15/29] xfs: add xfs_zero_range and xfs_truncate_page helpers Christoph Hellwig
2021-11-29 10:21 ` [PATCH 16/29] fsdax: simplify the offset check in dax_iomap_zero Christoph Hellwig
2021-11-29 10:21 ` [PATCH 17/29] fsdax: factor out a dax_memzero helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 18/29] fsdax: decouple zeroing from the iomap buffered I/O code Christoph Hellwig
2021-11-30 18:53 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 19/29] ext2: cleanup the dax handling in ext2_fill_super Christoph Hellwig
2021-11-29 10:21 ` [PATCH 20/29] ext4: cleanup the dax handling in ext4_fill_super Christoph Hellwig
2021-11-29 10:21 ` [PATCH 21/29] xfs: move dax device handling into xfs_{alloc,free}_buftarg Christoph Hellwig
2021-11-29 10:21 ` [PATCH 22/29] xfs: use xfs_direct_write_iomap_ops for DAX zeroing Christoph Hellwig
2021-11-29 10:21 ` [PATCH 23/29] xfs: pass the mapping flags to xfs_bmbt_to_iomap Christoph Hellwig
2021-11-30 18:59 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 24/29] iomap: add a IOMAP_DAX flag Christoph Hellwig
2021-11-30 19:02 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 25/29] dax: return the partition offset from fs_dax_get_by_bdev Christoph Hellwig
2021-11-30 19:04 ` Darrick J. Wong
2021-11-29 10:22 ` [PATCH 26/29] fsdax: shift partition offset handling into the file systems Christoph Hellwig
2021-11-30 19:06 ` Darrick J. Wong
2021-11-29 10:22 ` [PATCH 27/29] dax: fix up some of the block device related ifdefs Christoph Hellwig
2021-11-29 10:22 ` [PATCH 28/29] iomap: build the block based code conditionally Christoph Hellwig
2021-11-29 10:22 ` [PATCH 29/29] fsdax: don't require CONFIG_BLOCK Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2021-11-09 8:32 decouple DAX from block devices Christoph Hellwig
2021-11-09 8:32 ` [PATCH 05/29] dax: remove the pgmap sanity checks in generic_fsdax_supported Christoph Hellwig
2021-11-23 3:35 ` Dan Williams
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