The patch titled
Subject: mm: add unmap_mapping_pages()
has been added to the -mm tree. Its filename is
mm-add-unmap_mapping_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-unmap_mapping_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-unmap_mapping_pages.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: mm: add unmap_mapping_pages()
Several users of unmap_mapping_range() would prefer to express their range
in pages rather than bytes. Unfortuately, on a 32-bit kernel, you have to
remember to cast your page number to a 64-bit type before shifting it, and
four places in the current tree didn't remember to do that. That's a sign
of a bad interface.
Conveniently, unmap_mapping_range() actually converts from bytes into
pages, so hoist the guts of unmap_mapping_range() into a new function
unmap_mapping_pages() and convert the callers which want to use pages.
Link: http://lkml.kernel.org/r/20171206142627.GD32044@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Reported-by: "zhangyi (F)" <yi.zhang@xxxxxxxxxx>
Reviewed-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 19 ++++++-------------
include/linux/mm.h | 26 ++++++++++++++++----------
mm/khugepaged.c | 3 +--
mm/memory.c | 43 +++++++++++++++++++++++++++++++------------
mm/nommu.c | 7 -------
mm/truncate.c | 23 +++++++----------------
6 files changed, 61 insertions(+), 60 deletions(-)
diff -puN fs/dax.c~mm-add-unmap_mapping_pages fs/dax.c
--- a/fs/dax.c~mm-add-unmap_mapping_pages
+++ a/fs/dax.c
@@ -44,6 +44,7 @@
/* The 'colour' (ie low bits) within a PMD of a page offset. */
#define PG_PMD_COLOUR ((PMD_SIZE >> PAGE_SHIFT) - 1)
+#define PG_PMD_NR (PMD_SIZE >> PAGE_SHIFT)
static wait_queue_head_t wait_table[DAX_WAIT_TABLE_ENTRIES];
@@ -375,8 +376,8 @@ restart:
* unmapped.
*/
if (pmd_downgrade && dax_is_zero_entry(entry))
- unmap_mapping_range(mapping,
- (index << PAGE_SHIFT) & PMD_MASK, PMD_SIZE, 0);
+ unmap_mapping_pages(mapping, index & ~PG_PMD_COLOUR,
+ PG_PMD_NR, false);
err = radix_tree_preload(
mapping_gfp_mask(mapping) & ~__GFP_HIGHMEM);
@@ -538,12 +539,10 @@ static void *dax_insert_mapping_entry(st
if (dax_is_zero_entry(entry) && !(flags & RADIX_DAX_ZERO_PAGE)) {
/* we are replacing a zero page with block mapping */
if (dax_is_pmd_entry(entry))
- unmap_mapping_range(mapping,
- (vmf->pgoff << PAGE_SHIFT) & PMD_MASK,
- PMD_SIZE, 0);
+ unmap_mapping_pages(mapping, index & ~PG_PMD_COLOUR,
+ PG_PMD_NR, false);
else /* pte entry */
- unmap_mapping_range(mapping, vmf->pgoff << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ unmap_mapping_pages(mapping, vmf->pgoff, 1, false);
}
spin_lock_irq(&mapping->tree_lock);
@@ -1270,12 +1269,6 @@ static int dax_iomap_pte_fault(struct vm
}
#ifdef CONFIG_FS_DAX_PMD
-/*
- * The 'colour' (ie low bits) within a PMD of a page offset. This comes up
- * more often than one might expect in the below functions.
- */
-#define PG_PMD_COLOUR ((PMD_SIZE >> PAGE_SHIFT) - 1)
-
static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
void *entry)
{
diff -puN include/linux/mm.h~mm-add-unmap_mapping_pages include/linux/mm.h
--- a/include/linux/mm.h~mm-add-unmap_mapping_pages
+++ a/include/linux/mm.h
@@ -1312,8 +1312,6 @@ void free_pgd_range(struct mmu_gather *t
unsigned long end, unsigned long floor, unsigned long ceiling);
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
struct vm_area_struct *vma);
-void unmap_mapping_range(struct address_space *mapping,
- loff_t const holebegin, loff_t const holelen, int even_cows);
int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
unsigned long *start, unsigned long *end,
pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);
@@ -1324,12 +1322,6 @@ int follow_phys(struct vm_area_struct *v
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
-static inline void unmap_shared_mapping_range(struct address_space *mapping,
- loff_t const holebegin, loff_t const holelen)
-{
- unmap_mapping_range(mapping, holebegin, holelen, 0);
-}
-
extern void truncate_pagecache(struct inode *inode, loff_t new);
extern void truncate_setsize(struct inode *inode, loff_t newsize);
void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
@@ -1344,6 +1336,10 @@ extern int handle_mm_fault(struct vm_are
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
bool *unlocked);
+void unmap_mapping_pages(struct address_space *mapping,
+ pgoff_t start, pgoff_t nr, bool even_cows);
+void unmap_mapping_range(struct address_space *mapping,
+ loff_t const holebegin, loff_t const holelen, int even_cows);
#else
static inline int handle_mm_fault(struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
@@ -1360,10 +1356,20 @@ static inline int fixup_user_fault(struc
BUG();
return -EFAULT;
}
+static inline void unmap_mapping_pages(struct address_space *mapping,
+ pgoff_t start, pgoff_t nr, bool even_cows) { }
+static inline void unmap_mapping_range(struct address_space *mapping,
+ loff_t const holebegin, loff_t const holelen, int even_cows) { }
#endif
-extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len,
- unsigned int gup_flags);
+static inline void unmap_shared_mapping_range(struct address_space *mapping,
+ loff_t const holebegin, loff_t const holelen)
+{
+ unmap_mapping_range(mapping, holebegin, holelen, 0);
+}
+
+extern int access_process_vm(struct task_struct *tsk, unsigned long addr,
+ void *buf, int len, unsigned int gup_flags);
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, unsigned int gup_flags);
extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
diff -puN mm/khugepaged.c~mm-add-unmap_mapping_pages mm/khugepaged.c
--- a/mm/khugepaged.c~mm-add-unmap_mapping_pages
+++ a/mm/khugepaged.c
@@ -1399,8 +1399,7 @@ static void collapse_shmem(struct mm_str
}
if (page_mapped(page))
- unmap_mapping_range(mapping, index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ unmap_mapping_pages(mapping, index, 1, false);
spin_lock_irq(&mapping->tree_lock);
diff -puN mm/memory.c~mm-add-unmap_mapping_pages mm/memory.c
--- a/mm/memory.c~mm-add-unmap_mapping_pages
+++ a/mm/memory.c
@@ -2799,8 +2799,37 @@ static inline void unmap_mapping_range_t
}
/**
+ * unmap_mapping_pages() - Unmap pages from processes.
+ * @mapping: The address space containing pages to be unmapped.
+ * @start: Index of first page to be unmapped.
+ * @nr: Number of pages to be unmapped. 0 to unmap to end of file.
+ * @even_cows: Whether to unmap even private COWed pages.
+ *
+ * Unmap the pages in this address space from any userspace process which
+ * has them mmaped. Generally, you want to remove COWed pages as well when
+ * a file is being truncated, but not when invalidating pages from the page
+ * cache.
+ */
+void unmap_mapping_pages(struct address_space *mapping, pgoff_t start,
+ pgoff_t nr, bool even_cows)
+{
+ struct zap_details details = { };
+
+ details.check_mapping = even_cows ? NULL : mapping;
+ details.first_index = start;
+ details.last_index = start + nr - 1;
+ if (details.last_index < details.first_index)
+ details.last_index = ULONG_MAX;
+
+ i_mmap_lock_write(mapping);
+ if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)))
+ unmap_mapping_range_tree(&mapping->i_mmap, &details);
+ i_mmap_unlock_write(mapping);
+}
+
+/**
* unmap_mapping_range - unmap the portion of all mmaps in the specified
- * address_space corresponding to the specified page range in the underlying
+ * address_space corresponding to the specified byte range in the underlying
* file.
*
* @mapping: the address space containing mmaps to be unmapped.
@@ -2818,7 +2847,6 @@ static inline void unmap_mapping_range_t
void unmap_mapping_range(struct address_space *mapping,
loff_t const holebegin, loff_t const holelen, int even_cows)
{
- struct zap_details details = { };
pgoff_t hba = holebegin >> PAGE_SHIFT;
pgoff_t hlen = (holelen + PAGE_SIZE - 1) >> PAGE_SHIFT;
@@ -2830,16 +2858,7 @@ void unmap_mapping_range(struct address_
hlen = ULONG_MAX - hba + 1;
}
- details.check_mapping = even_cows ? NULL : mapping;
- details.first_index = hba;
- details.last_index = hba + hlen - 1;
- if (details.last_index < details.first_index)
- details.last_index = ULONG_MAX;
-
- i_mmap_lock_write(mapping);
- if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)))
- unmap_mapping_range_tree(&mapping->i_mmap, &details);
- i_mmap_unlock_write(mapping);
+ unmap_mapping_pages(mapping, hba, hlen, even_cows);
}
EXPORT_SYMBOL(unmap_mapping_range);
diff -puN mm/nommu.c~mm-add-unmap_mapping_pages mm/nommu.c
--- a/mm/nommu.c~mm-add-unmap_mapping_pages
+++ a/mm/nommu.c
@@ -1788,13 +1788,6 @@ unsigned long arch_get_unmapped_area(str
return -ENOMEM;
}
-void unmap_mapping_range(struct address_space *mapping,
- loff_t const holebegin, loff_t const holelen,
- int even_cows)
-{
-}
-EXPORT_SYMBOL(unmap_mapping_range);
-
int filemap_fault(struct vm_fault *vmf)
{
BUG();
diff -puN mm/truncate.c~mm-add-unmap_mapping_pages mm/truncate.c
--- a/mm/truncate.c~mm-add-unmap_mapping_pages
+++ a/mm/truncate.c
@@ -179,12 +179,8 @@ static void
truncate_cleanup_page(struct address_space *mapping, struct page *page)
{
if (page_mapped(page)) {
- loff_t holelen;
-
- holelen = PageTransHuge(page) ? HPAGE_PMD_SIZE : PAGE_SIZE;
- unmap_mapping_range(mapping,
- (loff_t)page->index << PAGE_SHIFT,
- holelen, 0);
+ pgoff_t nr = PageTransHuge(page) ? HPAGE_PMD_NR : 1;
+ unmap_mapping_pages(mapping, page->index, nr, false);
}
if (page_has_private(page))
@@ -715,19 +711,15 @@ int invalidate_inode_pages2_range(struct
/*
* Zap the rest of the file in one hit.
*/
- unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- (loff_t)(1 + end - index)
- << PAGE_SHIFT,
- 0);
+ unmap_mapping_pages(mapping, index,
+ (1 + end - index), false);
did_range_unmap = 1;
} else {
/*
* Just zap this page
*/
- unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ unmap_mapping_pages(mapping, index,
+ 1, false);
}
}
BUG_ON(page_mapped(page));
@@ -753,8 +745,7 @@ int invalidate_inode_pages2_range(struct
* get remapped later.
*/
if (dax_mapping(mapping)) {
- unmap_mapping_range(mapping, (loff_t)start << PAGE_SHIFT,
- (loff_t)(end - start + 1) << PAGE_SHIFT, 0);
+ unmap_mapping_pages(mapping, start, end - start + 1, false);
}
out:
cleancache_invalidate_inode(mapping);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-add-unmap_mapping_pages.patch
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