1 files changed, 0 insertions, 300 deletions
diff --git a/mm/as_dirty_helpers.c b/mm/as_dirty_helpers.c
deleted file mode 100644
index f600e31534fb..000000000000
--- a/mm/as_dirty_helpers.c
+++ /dev/null
@@ -1,300 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/mm.h>
-#include <linux/mm_types.h>
-#include <linux/hugetlb.h>
-#include <linux/bitops.h>
-#include <linux/mmu_notifier.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-
-/**
- * struct apply_as - Closure structure for apply_as_range
- * @base: struct pfn_range_apply we derive from
- * @start: Address of first modified pte
- * @end: Address of last modified pte + 1
- * @total: Total number of modified ptes
- * @vma: Pointer to the struct vm_area_struct we're currently operating on
- */
-struct apply_as {
-	struct pfn_range_apply base;
-	unsigned long start;
-	unsigned long end;
-	unsigned long total;
-	struct vm_area_struct *vma;
-};
-
-/**
- * apply_pt_wrprotect - Leaf pte callback to write-protect a pte
- * @pte: Pointer to the pte
- * @token: Page table token, see apply_to_pfn_range()
- * @addr: The virtual page address
- * @closure: Pointer to a struct pfn_range_apply embedded in a
- * struct apply_as
- *
- * The function write-protects a pte and records the range in
- * virtual address space of touched ptes for efficient range TLB flushes.
- *
- * Return: Always zero.
- */
-static int apply_pt_wrprotect(pte_t *pte, pgtable_t token,
-			      unsigned long addr,
-			      struct pfn_range_apply *closure)
-{
-	struct apply_as *aas = container_of(closure, typeof(*aas), base);
-	pte_t ptent = *pte;
-
-	if (pte_write(ptent)) {
-		pte_t old_pte = ptep_modify_prot_start(aas->vma, addr, pte);
-
-		ptent = pte_wrprotect(old_pte);
-		ptep_modify_prot_commit(aas->vma, addr, pte, old_pte, ptent);
-		aas->total++;
-		aas->start = min(aas->start, addr);
-		aas->end = max(aas->end, addr + PAGE_SIZE);
-	}
-
-	return 0;
-}
-
-/**
- * struct apply_as_clean - Closure structure for apply_as_clean
- * @base: struct apply_as we derive from
- * @bitmap_pgoff: Address_space Page offset of the first bit in @bitmap
- * @bitmap: Bitmap with one bit for each page offset in the address_space range
- * covered.
- * @start: Address_space page offset of first modified pte relative
- * to @bitmap_pgoff
- * @end: Address_space page offset of last modified pte relative
- * to @bitmap_pgoff
- */
-struct apply_as_clean {
-	struct apply_as base;
-	pgoff_t bitmap_pgoff;
-	unsigned long *bitmap;
-	pgoff_t start;
-	pgoff_t end;
-};
-
-/**
- * apply_pt_clean - Leaf pte callback to clean a pte
- * @pte: Pointer to the pte
- * @token: Page table token, see apply_to_pfn_range()
- * @addr: The virtual page address
- * @closure: Pointer to a struct pfn_range_apply embedded in a
- * struct apply_as_clean
- *
- * The function cleans a pte and records the range in
- * virtual address space of touched ptes for efficient TLB flushes.
- * It also records dirty ptes in a bitmap representing page offsets
- * in the address_space, as well as the first and last of the bits
- * touched.
- *
- * Return: Always zero.
- */
-static int apply_pt_clean(pte_t *pte, pgtable_t token,
-			  unsigned long addr,
-			  struct pfn_range_apply *closure)
-{
-	struct apply_as *aas = container_of(closure, typeof(*aas), base);
-	struct apply_as_clean *clean = container_of(aas, typeof(*clean), base);
-	pte_t ptent = *pte;
-
-	if (pte_dirty(ptent)) {
-		pgoff_t pgoff = ((addr - aas->vma->vm_start) >> PAGE_SHIFT) +
-			aas->vma->vm_pgoff - clean->bitmap_pgoff;
-		pte_t old_pte = ptep_modify_prot_start(aas->vma, addr, pte);
-
-		ptent = pte_mkclean(old_pte);
-		ptep_modify_prot_commit(aas->vma, addr, pte, old_pte, ptent);
-
-		aas->total++;
-		aas->start = min(aas->start, addr);
-		aas->end = max(aas->end, addr + PAGE_SIZE);
-
-		__set_bit(pgoff, clean->bitmap);
-		clean->start = min(clean->start, pgoff);
-		clean->end = max(clean->end, pgoff + 1);
-	}
-
-	return 0;
-}
-
-/**
- * apply_as_range - Apply a pte callback to all PTEs pointing into a range
- * of an address_space.
- * @mapping: Pointer to the struct address_space
- * @aas: Closure structure
- * @first_index: First page offset in the address_space
- * @nr: Number of incremental page offsets to cover
- *
- * Return: Number of ptes touched. Note that this number might be larger
- * than @nr if there are overlapping vmas
- */
-static unsigned long apply_as_range(struct address_space *mapping,
-				    struct apply_as *aas,
-				    pgoff_t first_index, pgoff_t nr)
-{
-	struct vm_area_struct *vma;
-	pgoff_t vba, vea, cba, cea;
-	unsigned long start_addr, end_addr;
-	struct mmu_notifier_range range;
-
-	i_mmap_lock_read(mapping);
-	vma_interval_tree_foreach(vma, &mapping->i_mmap, first_index,
-				  first_index + nr - 1) {
-		unsigned long vm_flags = READ_ONCE(vma->vm_flags);
-
-		/*
-		 * We can only do advisory flag tests below, since we can't
-		 * require the vm's mmap_sem to be held to protect the flags.
-		 * Therefore, callers that strictly depend on specific mmap
-		 * flags to remain constant throughout the operation must
-		 * either ensure those flags are immutable for all relevant
-		 * vmas or can't use this function. Fixing this properly would
-		 * require the vma::vm_flags to be protected by a separate
-		 * lock taken after the i_mmap_lock
-		 */
-
-		/* Skip non-applicable VMAs */
-		if ((vm_flags & (VM_SHARED | VM_WRITE)) !=
-		    (VM_SHARED | VM_WRITE))
-			continue;
-
-		/* Warn on and skip VMAs whose flags indicate illegal usage */
-		if (WARN_ON((vm_flags & (VM_HUGETLB | VM_IO)) != VM_IO))
-			continue;
-
-		/* Clip to the vma */
-		vba = vma->vm_pgoff;
-		vea = vba + vma_pages(vma);
-		cba = first_index;
-		cba = max(cba, vba);
-		cea = first_index + nr;
-		cea = min(cea, vea);
-
-		/* Translate to virtual address */
-		start_addr = ((cba - vba) << PAGE_SHIFT) + vma->vm_start;
-		end_addr = ((cea - vba) << PAGE_SHIFT) + vma->vm_start;
-		if (start_addr >= end_addr)
-			continue;
-
-		aas->base.mm = vma->vm_mm;
-		aas->vma = vma;
-		aas->start = end_addr;
-		aas->end = start_addr;
-
-		mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE, 0,
-					vma, vma->vm_mm, start_addr, end_addr);
-		mmu_notifier_invalidate_range_start(&range);
-
-		/* Needed when we only change protection? */
-		flush_cache_range(vma, start_addr, end_addr);
-
-		/*
-		 * We're not using tlb_gather_mmu() since typically
-		 * only a small subrange of PTEs are affected.
-		 */
-		inc_tlb_flush_pending(vma->vm_mm);
-
-		/* Should not error since aas->base.alloc == 0 */
-		WARN_ON(apply_to_pfn_range(&aas->base, start_addr,
-					   end_addr - start_addr));
-		if (aas->end > aas->start)
-			flush_tlb_range(vma, aas->start, aas->end);
-
-		mmu_notifier_invalidate_range_end(&range);
-		dec_tlb_flush_pending(vma->vm_mm);
-	}
-	i_mmap_unlock_read(mapping);
-
-	return aas->total;
-}
-
-/**
- * apply_as_wrprotect - Write-protect all ptes in an address_space range
- * @mapping: The address_space we want to write protect
- * @first_index: The first page offset in the range
- * @nr: Number of incremental page offsets to cover
- *
- * WARNING: This function should only be used for address spaces whose
- * vmas are marked VM_IO and that do not contain huge pages.
- * To avoid interference with COW'd pages, vmas not marked VM_SHARED are
- * simply skipped.
- *
- * Return: The number of ptes actually write-protected. Note that
- * already write-protected ptes are not counted.
- */
-unsigned long apply_as_wrprotect(struct address_space *mapping,
-				 pgoff_t first_index, pgoff_t nr)
-{
-	struct apply_as aas = {
-		.base = {
-			.alloc = 0,
-			.ptefn = apply_pt_wrprotect,
-		},
-		.total = 0,
-	};
-
-	return apply_as_range(mapping, &aas, first_index, nr);
-}
-EXPORT_SYMBOL_GPL(apply_as_wrprotect);
-
-/**
- * apply_as_clean - Clean all ptes in an address_space range
- * @mapping: The address_space we want to clean
- * @first_index: The first page offset in the range
- * @nr: Number of incremental page offsets to cover
- * @bitmap_pgoff: The page offset of the first bit in @bitmap
- * @bitmap: Pointer to a bitmap of at least @nr bits. The bitmap needs to
- * cover the whole range @first_index..@first_index + @nr.
- * @start: Pointer to number of the first set bit in @bitmap.
- * is modified as new bits are set by the function.
- * @end: Pointer to the number of the last set bit in @bitmap.
- * none set. The value is modified as new bits are set by the function.
- *
- * Note: When this function returns there is no guarantee that a CPU has
- * not already dirtied new ptes. However it will not clean any ptes not
- * reported in the bitmap.
- *
- * If a caller needs to make sure all dirty ptes are picked up and none
- * additional are added, it first needs to write-protect the address-space
- * range and make sure new writers are blocked in page_mkwrite() or
- * pfn_mkwrite(). And then after a TLB flush following the write-protection
- * pick up all dirty bits.
- *
- * WARNING: This function should only be used for address spaces whose
- * vmas are marked VM_IO and that do not contain huge pages.
- * To avoid interference with COW'd pages, vmas not marked VM_SHARED are
- * simply skipped.
- *
- * Return: The number of dirty ptes actually cleaned.
- */
-unsigned long apply_as_clean(struct address_space *mapping,
-			     pgoff_t first_index, pgoff_t nr,
-			     pgoff_t bitmap_pgoff,
-			     unsigned long *bitmap,
-			     pgoff_t *start,
-			     pgoff_t *end)
-{
-	bool none_set = (*start >= *end);
-	struct apply_as_clean clean = {
-		.base = {
-			.base = {
-				.alloc = 0,
-				.ptefn = apply_pt_clean,
-			},
-			.total = 0,
-		},
-		.bitmap_pgoff = bitmap_pgoff,
-		.bitmap = bitmap,
-		.start = none_set ? nr : *start,
-		.end = none_set ? 0 : *end,
-	};
-	unsigned long ret = apply_as_range(mapping, &clean.base, first_index,
-					   nr);
-
-	*start = clean.start;
-	*end = clean.end;
-	return ret;
-}
-EXPORT_SYMBOL_GPL(apply_as_clean);