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authorMatthew Wilcox <willy@linux.intel.com>2015-09-08 14:58:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commit4897c7655d9419ba7e62bac145ec6a1847134d93 (patch)
tree6d627db1b64dd2e99044aacb1700b8cf6e46f731 /include/linux/dax.h
parent7c414164593514f76b422faae0824bdd3754209b (diff)
thp: prepare for DAX huge pages
Add a vma_is_dax() helper macro to test whether the VMA is DAX, and use it in zap_huge_pmd() and __split_huge_page_pmd(). [akpm@linux-foundation.org: fix build] Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/dax.h')
-rw-r--r--include/linux/dax.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 4f27d3dbf6e8..9b51f9d40ad9 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -18,4 +18,8 @@ int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
#define dax_mkwrite(vma, vmf, gb, iod) dax_fault(vma, vmf, gb, iod)
#define __dax_mkwrite(vma, vmf, gb, iod) __dax_fault(vma, vmf, gb, iod)
+static inline bool vma_is_dax(struct vm_area_struct *vma)
+{
+ return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
+}
#endif