From 3fe0791c295cfd3cd735de7a32cc0780949c009f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 14 Oct 2017 17:13:45 -0700 Subject: dax: store pfns in the radix In preparation for examining the busy state of dax pages in the truncate path, switch from sectors to pfns in the radix. Cc: Jeff Moyer Cc: Christoph Hellwig Cc: Matthew Wilcox Cc: Ross Zwisler Reviewed-by: Jan Kara Signed-off-by: Dan Williams --- drivers/dax/super.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'drivers/dax') diff --git a/drivers/dax/super.c b/drivers/dax/super.c index ecdc292aa4e4..2b2332b605e4 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -124,10 +124,19 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize) return len < 0 ? len : -EIO; } - if ((IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) - || pfn_t_devmap(pfn)) + 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)); + } else if (pfn_t_devmap(pfn)) { /* pass */; - else { + } else { pr_debug("VFS (%s): error: dax support not enabled\n", sb->s_id); return -EOPNOTSUPP; -- cgit v1.2.3