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: 5a023cdba5
("block: enable dax for raw block devices")
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
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@ -1730,6 +1730,12 @@ static int blkdev_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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return __dax_fault(vma, vmf, blkdev_get_block, NULL);
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}
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static int blkdev_dax_pfn_mkwrite(struct vm_area_struct *vma,
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struct vm_fault *vmf)
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{
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return dax_pfn_mkwrite(vma, vmf);
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}
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static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd, unsigned int flags)
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{
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@ -1739,7 +1745,7 @@ static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
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static const struct vm_operations_struct blkdev_dax_vm_ops = {
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.fault = blkdev_dax_fault,
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.pmd_fault = blkdev_dax_pmd_fault,
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.pfn_mkwrite = blkdev_dax_fault,
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.pfn_mkwrite = blkdev_dax_pfn_mkwrite,
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};
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static const struct vm_operations_struct blkdev_default_vm_ops = {
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