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dax: Allow dax_iomap_fault() to return pfn

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For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Ross Zwisler <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Jan Kara 2017-11-01 16:36:39 +01:00 • committed by Dan Williams
commit 9a0dd42251
5 changed files with 12 additions and 11 deletions
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13
fs/dax.c
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@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
return VM_FAULT_SIGBUS;
}
static int dax_iomap_pte_fault(struct vm_fault *vmf,
static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
const struct iomap_ops *ops)
{
struct vm_area_struct *vma = vmf->vma;
@ -1280,7 +1280,7 @@ fallback:
return VM_FAULT_FALLBACK;
}
static int dax_iomap_pmd_fault(struct vm_fault *vmf,
static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
const struct iomap_ops *ops)
{
struct vm_area_struct *vma = vmf->vma;
@ -1425,7 +1425,7 @@ out:
return result;
}
#else
static int dax_iomap_pmd_fault(struct vm_fault *vmf,
static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
const struct iomap_ops *ops)
{
return VM_FAULT_FALLBACK;
@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
* dax_iomap_fault - handle a page fault on a DAX file
* @vmf: The description of the fault
* @pe_size: Size of the page to fault in
* @pfnp: PFN to insert for synchronous faults if fsync is required
* @ops: Iomap ops passed from the file system
*
* When a page fault occurs, filesystems may call this helper in
@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
* successfully.
*/
int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
const struct iomap_ops *ops)
pfn_t *pfnp, const struct iomap_ops *ops)
{
switch (pe_size) {
case PE_SIZE_PTE:
return dax_iomap_pte_fault(vmf, ops);
return dax_iomap_pte_fault(vmf, pfnp, ops);
case PE_SIZE_PMD:
return dax_iomap_pmd_fault(vmf, ops);
return dax_iomap_pmd_fault(vmf, pfnp, ops);
default:
return VM_FAULT_FALLBACK;
}