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.
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Fixes: 5a023cdba50c ("block: enable dax for raw block devices")
---
fs/block_dev.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7b9cd49..fa0507a 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1730,6 +1730,12 @@ static int blkdev_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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 blkdev_dax_vm_ops = {
.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 = {
--
2.5.0
--
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