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authorChristoph Hellwig <hch@lst.de>2021-11-29 11:21:39 +0100
committerDan Williams <dan.j.williams@intel.com>2021-12-04 08:58:51 -0800
commit586f61682816f0cf7865b2dab7210b8f5339f834 (patch)
treef31b5aced5257469592aa8d224b8294c68cb95a8
parentfb08a1908cb119a4585611d91461ab6d27756b14 (diff)
downloadlinux-586f61682816f0cf7865b2dab7210b8f5339f834.tar.bz2
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 <hch@lst.de> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20211129102203.2243509-6-hch@lst.de Signed-off-by: Dan Williams <dan.j.williams@intel.com>
-rw-r--r--drivers/dax/super.c49
1 files changed, 1 insertions, 48 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index bf77c3da5d56..c8500b7e2d8a 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);