The patch titled
Subject: fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2
has been added to the -mm mm-unstable branch. Its filename is
fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Subject: fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2
Date: Wed, 7 Dec 2022 02:49:19 +0000
v2.2
Link: https://lkml.kernel.org/r/1670381359-53-1-git-send-email-ruansy.fnst@xxxxxxxxxxx
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Reviewed-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/fs/dax.c~fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2
+++ a/fs/dax.c
@@ -336,28 +336,28 @@ static unsigned long dax_end_pfn(void *e
static inline bool dax_page_is_shared(struct page *page)
{
- return (unsigned long)page->mapping == PAGE_MAPPING_DAX_SHARED;
+ return page->mapping == PAGE_MAPPING_DAX_SHARED;
}
/*
* Set the page->mapping with PAGE_MAPPING_DAX_SHARED flag, increase the
* refcount.
*/
-static inline void dax_page_bump_sharing(struct page *page)
+static inline void dax_page_share_get(struct page *page)
{
- if ((uintptr_t)page->mapping != PAGE_MAPPING_DAX_SHARED) {
+ if (page->mapping != PAGE_MAPPING_DAX_SHARED) {
/*
* Reset the index if the page was already mapped
* regularly before.
*/
if (page->mapping)
page->share = 1;
- page->mapping = (void *)PAGE_MAPPING_DAX_SHARED;
+ page->mapping = PAGE_MAPPING_DAX_SHARED;
}
page->share++;
}
-static inline unsigned long dax_page_drop_sharing(struct page *page)
+static inline unsigned long dax_page_share_put(struct page *page)
{
return --page->share;
}
@@ -381,7 +381,7 @@ static void dax_associate_entry(void *en
struct page *page = pfn_to_page(pfn);
if (shared) {
- dax_page_bump_sharing(page);
+ dax_page_share_get(page);
} else {
WARN_ON_ONCE(page->mapping);
page->mapping = mapping;
@@ -404,7 +404,7 @@ static void dax_disassociate_entry(void
WARN_ON_ONCE(trunc && page_ref_count(page) > 1);
if (dax_page_is_shared(page)) {
/* keep the shared flag if this page is still shared */
- if (dax_page_drop_sharing(page) > 0)
+ if (dax_page_share_put(page) > 0)
continue;
} else
WARN_ON_ONCE(page->mapping && page->mapping != mapping);
--- a/include/linux/page-flags.h~fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2
+++ a/include/linux/page-flags.h
@@ -638,7 +638,7 @@ PAGEFLAG_FALSE(VmemmapSelfHosted, vmemma
* Different with flags above, this flag is used only for fsdax mode. It
* indicates that this page->mapping is now under reflink case.
*/
-#define PAGE_MAPPING_DAX_SHARED 0x1
+#define PAGE_MAPPING_DAX_SHARED ((void *)0x1)
static __always_inline bool folio_mapping_flags(struct folio *folio)
{
_
Patches currently in -mm which might be from ruansy.fnst@xxxxxxxxxxx are
fsdax-introduce-page-share-for-fsdax-in-reflink-mode.patch
fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix.patch
fsdax-introduce-page-share-for-fsdax-in-reflink-mode-fix-2.patch
fsdax-invalidate-pages-when-cow.patch
fsdax-zero-the-edges-if-source-is-hole-or-unwritten.patch
fsdaxxfs-set-the-shared-flag-when-file-extent-is-shared.patch
fsdax-dedupe-iter-two-files-at-the-same-time.patch
xfs-use-dax-ops-for-zero-and-truncate-in-fsdax-mode.patch
fsdaxxfs-port-unshare-to-fsdax.patch
xfs-remove-restrictions-for-fsdax-and-reflink.patch
