The patch titled
Subject: block: fix pfn_mkwrite() DAX fault handler
has been added to the -mm tree. Its filename is
block-fix-pfn_mkwrite-dax-fault-handler.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/block-fix-pfn_mkwrite-dax-fault-handler.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/block-fix-pfn_mkwrite-dax-fault-handler.patch
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------------------------------------------------------
From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: block: fix pfn_mkwrite() DAX fault handler
Previously the pfn_mkwrite() fault handler for raw block devices called
bldev_dax_fault() -> __dax_fault() to do a full DAX page fault. Really
what the pfn_mkwrite() fault handler needs to do is call dax_pfn_mkwrite()
to make sure that the radix tree entry for the given PTE is marked as
dirty so that a follow-up fsync or msync call will flush it durably to
media.
Fixes: 5a023cdba50c ("block: enable dax for raw block devices")
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/block_dev.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN fs/block_dev.c~block-fix-pfn_mkwrite-dax-fault-handler fs/block_dev.c
--- a/fs/block_dev.c~block-fix-pfn_mkwrite-dax-fault-handler
+++ a/fs/block_dev.c
@@ -1730,6 +1730,12 @@ static int blkdev_dax_fault(struct vm_ar
return __dax_fault(vma, vmf, blkdev_get_block, NULL);
}
+static int blkdev_dax_pfn_mkwrite(struct vm_area_struct *vma,
+ struct vm_fault *vmf)
+{
+ return dax_pfn_mkwrite(vma, vmf);
+}
+
static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd, unsigned int flags)
{
@@ -1761,7 +1767,7 @@ static const struct vm_operations_struct
.close = blkdev_vm_close,
.fault = blkdev_dax_fault,
.pmd_fault = blkdev_dax_pmd_fault,
- .pfn_mkwrite = blkdev_dax_fault,
+ .pfn_mkwrite = blkdev_dax_pfn_mkwrite,
};
static const struct vm_operations_struct blkdev_default_vm_ops = {
_
Patches currently in -mm which might be from ross.zwisler@xxxxxxxxxxxxxxx are
block-fix-pfn_mkwrite-dax-fault-handler.patch
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