diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 0261f332bf3ec88f839849eb4574826a2ef4ff2c..922ec461dcaa323b35f7b09191c4eeda28e249c0 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -419,7 +419,7 @@ static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff,
return -1;
}
-static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
+static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
{
struct device *dev = &dax_dev->dev;
struct dax_region *dax_region;
@@ -455,23 +455,6 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
return VM_FAULT_NOPAGE;
}
-static int dax_dev_fault(struct vm_fault *vmf)
-{
- struct vm_area_struct *vma = vmf->vma;
- int rc;
- struct file *filp = vma->vm_file;
- struct dax_dev *dax_dev = filp->private_data;
-
- dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx)\n", __func__,
- current->comm, (vmf->flags & FAULT_FLAG_WRITE)
- ? "write" : "read", vma->vm_start, vma->vm_end);
- rcu_read_lock();
- rc = __dax_dev_fault(dax_dev, vmf);
- rcu_read_unlock();
-
- return rc;
-}
-
static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
{
unsigned long pmd_addr = vmf->address & PMD_MASK;
@@ -510,7 +493,7 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf)
vmf->flags & FAULT_FLAG_WRITE);
}
-static int dax_dev_pmd_fault(struct vm_fault *vmf)
+static int dax_dev_fault(struct vm_fault *vmf)
{
int rc;
struct file *filp = vmf->vma->vm_file;
@@ -522,7 +505,16 @@ static int dax_dev_pmd_fault(struct vm_fault *vmf)
vmf->vma->vm_start, vmf->vma->vm_end);
rcu_read_lock();
- rc = __dax_dev_pmd_fault(dax_dev, vmf);
+ switch (vmf->flags & FAULT_FLAG_SIZE_MASK) {
+ case FAULT_FLAG_SIZE_PTE:
+ rc = __dax_dev_pte_fault(dax_dev, vmf);
+ break;
+ case FAULT_FLAG_SIZE_PMD:
+ rc = __dax_dev_pmd_fault(dax_dev, vmf);
+ break;
+ default:
+ return VM_FAULT_FALLBACK;
+ }
rcu_read_unlock();
return rc;
@@ -530,7 +522,7 @@ static int dax_dev_pmd_fault(struct vm_fault *vmf)
static const struct vm_operations_struct dax_dev_vm_ops = {
.fault = dax_dev_fault,
- .pmd_fault = dax_dev_pmd_fault,
+ .huge_fault = dax_dev_fault,
};
static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
diff --git a/fs/dax.c b/fs/dax.c
index f955c0df33bbf29530f331008c1cfa9f1a0b6932..c3c29fbf64be09dc60a4f517c97745068feb9ac5 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1118,16 +1118,8 @@ static int dax_fault_return(int error)
return VM_FAULT_SIGBUS;
}
-/**
- * dax_iomap_fault - handle a page fault on a DAX file
- * @vmf: The description of the fault
- * @ops: iomap ops passed from the file system
- *
- * When a page fault occurs, filesystems may call this helper in their fault
- * or mkwrite handler for DAX files. Assumes the caller has done all the
- * necessary locking for the page fault to proceed successfully.
- */
-int dax_iomap_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
+static int dax_iomap_pte_fault(struct vm_fault *vmf,
+ const struct iomap_ops *ops)
{
struct address_space *mapping = vmf->vma->vm_file->f_mapping;
struct inode *inode = mapping->host;
@@ -1244,7 +1236,6 @@ int dax_iomap_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
}
return vmf_ret;
}
-EXPORT_SYMBOL_GPL(dax_iomap_fault);
#ifdef CONFIG_FS_DAX_PMD
/*
@@ -1335,7 +1326,8 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
return VM_FAULT_FALLBACK;
}
-int dax_iomap_pmd_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
+static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+ const struct iomap_ops *ops)
{
struct vm_area_struct *vma = vmf->vma;
struct address_space *mapping = vma->vm_file->f_mapping;
@@ -1443,5 +1435,32 @@ int dax_iomap_pmd_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
trace_dax_pmd_fault_done(inode, vmf, max_pgoff, result);
return result;
}
-EXPORT_SYMBOL_GPL(dax_iomap_pmd_fault);
+#else
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, struct iomap_ops *ops)
+{
+ return VM_FAULT_FALLBACK;
+}
#endif /* CONFIG_FS_DAX_PMD */
+
+/**
+ * dax_iomap_fault - handle a page fault on a DAX file
+ * @vmf: The description of the fault
+ * @ops: iomap ops passed from the file system
+ *
+ * When a page fault occurs, filesystems may call this helper in
+ * their fault handler for DAX files. dax_iomap_fault() assumes the caller
+ * has done all the necessary locking for page fault to proceed
+ * successfully.
+ */
+int dax_iomap_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
+{
+ switch (vmf->flags & FAULT_FLAG_SIZE_MASK) {
+ case FAULT_FLAG_SIZE_PTE:
+ return dax_iomap_pte_fault(vmf, ops);
+ case FAULT_FLAG_SIZE_PMD:
+ return dax_iomap_pmd_fault(vmf, ops);
+ default:
+ return VM_FAULT_FALLBACK;
+ }
+}
+EXPORT_SYMBOL_GPL(dax_iomap_fault);
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 0bf0d971205a5693334c448ac36dba907c9de8e1..68738832beda615dff8f926882d32692b5bc4a70 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -133,7 +133,7 @@ static int ext2_dax_pfn_mkwrite(struct vm_fault *vmf)
static const struct vm_operations_struct ext2_dax_vm_ops = {
.fault = ext2_dax_fault,
/*
- * .pmd_fault is not supported for DAX because allocation in ext2
+ * .huge_fault is not supported for DAX because allocation in ext2
* cannot be reliably aligned to huge page sizes and so pmd faults
* will always fail and fail back to regular faults.
*/
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 21e1f17fe36da1a611e2e1ba0552245a6dd7d889..502d2d07d19116cbf5283d5b591187778c5f8707 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -273,27 +273,6 @@ static int ext4_dax_fault(struct vm_fault *vmf)
return result;
}
-static int
-ext4_dax_pmd_fault(struct vm_fault *vmf)
-{
- int result;
- struct inode *inode = file_inode(vmf->vma->vm_file);
- struct super_block *sb = inode->i_sb;
- bool write = vmf->flags & FAULT_FLAG_WRITE;
-
- if (write) {
- sb_start_pagefault(sb);
- file_update_time(vmf->vma->vm_file);
- }
- down_read(&EXT4_I(inode)->i_mmap_sem);
- result = dax_iomap_pmd_fault(vmf, &ext4_iomap_ops);
- up_read(&EXT4_I(inode)->i_mmap_sem);
- if (write)
- sb_end_pagefault(sb);
-
- return result;
-}
-
/*
* Handle write fault for VM_MIXEDMAP mappings. Similarly to ext4_dax_fault()
* handler we check for races agaist truncate. Note that since we cycle through
@@ -326,7 +305,7 @@ static int ext4_dax_pfn_mkwrite(struct vm_fault *vmf)
static const struct vm_operations_struct ext4_dax_vm_ops = {
.fault = ext4_dax_fault,
- .pmd_fault = ext4_dax_pmd_fault,
+ .huge_fault = ext4_dax_fault,
.page_mkwrite = ext4_dax_fault,
.pfn_mkwrite = ext4_dax_pfn_mkwrite,
};
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 9cc10136ba0b9838258ecf71a065262954dcd3e8..990e0381937072b5bcf9fb515ce3ab99e4e64a95 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1429,12 +1429,12 @@ xfs_filemap_fault(
/*
* Similar to xfs_filemap_fault(), the DAX fault path can call into here on
* both read and write faults. Hence we need to handle both cases. There is no
- * ->pmd_mkwrite callout for huge pages, so we have a single function here to
+ * ->huge_mkwrite callout for huge pages, so we have a single function here to
* handle both cases here. @flags carries the information on the type of fault
* occuring.
*/
STATIC int
-xfs_filemap_pmd_fault(
+xfs_filemap_huge_fault(
struct vm_fault *vmf)
{
struct inode *inode = file_inode(vmf->vma->vm_file);
@@ -1444,7 +1444,7 @@ xfs_filemap_pmd_fault(
if (!IS_DAX(inode))
return VM_FAULT_FALLBACK;
- trace_xfs_filemap_pmd_fault(ip);
+ trace_xfs_filemap_huge_fault(ip);
if (vmf->flags & FAULT_FLAG_WRITE) {
sb_start_pagefault(inode->i_sb);
@@ -1452,7 +1452,7 @@ xfs_filemap_pmd_fault(
}
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
- ret = dax_iomap_pmd_fault(vmf, &xfs_iomap_ops);
+ ret = dax_iomap_fault(vmf, &xfs_iomap_ops);
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
if (vmf->flags & FAULT_FLAG_WRITE)
@@ -1497,7 +1497,7 @@ xfs_filemap_pfn_mkwrite(
static const struct vm_operations_struct xfs_file_vm_ops = {
.fault = xfs_filemap_fault,
- .pmd_fault = xfs_filemap_pmd_fault,
+ .huge_fault = xfs_filemap_huge_fault,
.map_pages = filemap_map_pages,
.page_mkwrite = xfs_filemap_page_mkwrite,
.pfn_mkwrite = xfs_filemap_pfn_mkwrite,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index fb7555e73a62ef586a13979d1296df5eb95cb905..383ac227ce2c324cee29b5e8a209fa6b98583192 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -687,7 +687,7 @@ DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid);
DEFINE_INODE_EVENT(xfs_filemap_fault);
-DEFINE_INODE_EVENT(xfs_filemap_pmd_fault);
+DEFINE_INODE_EVENT(xfs_filemap_huge_fault);
DEFINE_INODE_EVENT(xfs_filemap_page_mkwrite);
DEFINE_INODE_EVENT(xfs_filemap_pfn_mkwrite);
diff --git a/include/linux/dax.h b/include/linux/dax.h
index eeb02421c848ccb21ef81914a425da4427b53adf..cf9af225962b1bb937ec963bf623a984ff7578aa 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -70,17 +70,11 @@ static inline unsigned int dax_radix_order(void *entry)
return PMD_SHIFT - PAGE_SHIFT;
return 0;
}
-int dax_iomap_pmd_fault(struct vm_fault *vmf, const struct iomap_ops *ops);
#else
static inline unsigned int dax_radix_order(void *entry)
{
return 0;
}
-static inline int dax_iomap_pmd_fault(struct vm_fault *vmf,
- const struct iomap_ops *ops)
-{
- return VM_FAULT_FALLBACK;
-}
#endif
int dax_pfn_mkwrite(struct vm_fault *vmf);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3dd80ba6568a0a9235beba71468aa3b814a1d608..035a688e5472b01e925e3d8c7a1e440fb4294b5b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -285,6 +285,11 @@ extern pgprot_t protection_map[16];
#define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
#define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
+#define FAULT_FLAG_SIZE_MASK 0x7000 /* Support up to 8-level page tables */
+#define FAULT_FLAG_SIZE_PTE 0x0000 /* First level (eg 4k) */
+#define FAULT_FLAG_SIZE_PMD 0x1000 /* Second level (eg 2MB) */
+#define FAULT_FLAG_SIZE_PUD 0x2000 /* Third level (eg 1GB) */
+
#define FAULT_FLAG_TRACE \
{ FAULT_FLAG_WRITE, "WRITE" }, \
{ FAULT_FLAG_MKWRITE, "MKWRITE" }, \
@@ -314,6 +319,9 @@ struct vm_fault {
unsigned long address; /* Faulting virtual address */
pmd_t *pmd; /* Pointer to pmd entry matching
* the 'address' */
+ pud_t *pud; /* Pointer to pud entry matching
+ * the 'address'
+ */
pte_t orig_pte; /* Value of PTE at the time of fault */
struct page *cow_page; /* Page handler may use for COW fault */
@@ -351,7 +359,7 @@ struct vm_operations_struct {
void (*close)(struct vm_area_struct * area);
int (*mremap)(struct vm_area_struct * area);
int (*fault)(struct vm_fault *vmf);
- int (*pmd_fault)(struct vm_fault *vmf);
+ int (*huge_fault)(struct vm_fault *vmf);
void (*map_pages)(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff);
diff --git a/mm/memory.c b/mm/memory.c
index cf97d88158cd38607ff7917d05a91e9524207358..e721e8eba5703382de135084d760cc96ed1ccb88 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3466,8 +3466,8 @@ static int create_huge_pmd(struct vm_fault *vmf)
{
if (vma_is_anonymous(vmf->vma))
return do_huge_pmd_anonymous_page(vmf);
- if (vmf->vma->vm_ops->pmd_fault)
- return vmf->vma->vm_ops->pmd_fault(vmf);
+ if (vmf->vma->vm_ops->huge_fault)
+ return vmf->vma->vm_ops->huge_fault(vmf);
return VM_FAULT_FALLBACK;
}
@@ -3475,8 +3475,8 @@ static int wp_huge_pmd(struct vm_fault *vmf, pmd_t orig_pmd)
{
if (vma_is_anonymous(vmf->vma))
return do_huge_pmd_wp_page(vmf, orig_pmd);
- if (vmf->vma->vm_ops->pmd_fault)
- return vmf->vma->vm_ops->pmd_fault(vmf);
+ if (vmf->vma->vm_ops->huge_fault)
+ return vmf->vma->vm_ops->huge_fault(vmf);
/* COW handled on pte level: split pmd */
VM_BUG_ON_VMA(vmf->vma->vm_flags & VM_SHARED, vmf->vma);
@@ -3606,6 +3606,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
pud_t *pud;
+ int ret;
pgd = pgd_offset(mm, address);
pud = pud_alloc(mm, pgd, address);
@@ -3615,15 +3616,18 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
if (!vmf.pmd)
return VM_FAULT_OOM;
if (pmd_none(*vmf.pmd) && transparent_hugepage_enabled(vma)) {
- int ret = create_huge_pmd(&vmf);
+ vmf.flags |= FAULT_FLAG_SIZE_PMD;
+ ret = create_huge_pmd(&vmf);
if (!(ret & VM_FAULT_FALLBACK))
return ret;
+ /* fall through path, remove PMD flag */
+ vmf.flags &= ~FAULT_FLAG_SIZE_PMD;
} else {
pmd_t orig_pmd = *vmf.pmd;
- int ret;
barrier();
if (pmd_trans_huge(orig_pmd) || pmd_devmap(orig_pmd)) {
+ vmf.flags |= FAULT_FLAG_SIZE_PMD;
if (pmd_protnone(orig_pmd) && vma_is_accessible(vma))
return do_huge_pmd_numa_page(&vmf, orig_pmd);
@@ -3632,6 +3636,8 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
ret = wp_huge_pmd(&vmf, orig_pmd);
if (!(ret & VM_FAULT_FALLBACK))
return ret;
+ /* fall through path, remove PUD flag */
+ vmf.flags &= ~FAULT_FLAG_SIZE_PUD;
} else {
huge_pmd_set_accessed(&vmf, orig_pmd);
return 0;