在 2022/1/21 15:16, Christoph Hellwig 写道:
On Fri, Jan 21, 2022 at 10:33:58AM +0800, Shiyang Ruan wrote:
But different question, how does this not conflict with:
#define PAGE_MAPPING_ANON 0x1
in page-flags.h?
Now we are treating dax pages, so I think its flags should be different
On Fri, Jan 21, 2022 at 10:33:58AM +0800, Shiyang Ruan wrote:
> >
> > But different question, how does this not conflict with:
> >
> > #define PAGE_MAPPING_ANON 0x1
> >
> > in page-flags.h?
>
> Now we are treating dax pages, so I think its flags should be different from
> normal page.
在 2022/1/20 16:59, Christoph Hellwig 写道:
On Sun, Dec 26, 2021 at 10:34:39PM +0800, Shiyang Ruan wrote:
+#define FS_DAX_MAPPING_COW 1UL
+
+#define MAPPING_SET_COW(m) (m = (struct address_space *)FS_DAX_MAPPING_COW)
+#define MAPPING_TEST_COW(m)(((unsigned long)m &
On Sun, Dec 26, 2021 at 10:34:39PM +0800, Shiyang Ruan wrote:
> +#define FS_DAX_MAPPING_COW 1UL
> +
> +#define MAPPING_SET_COW(m) (m = (struct address_space *)FS_DAX_MAPPING_COW)
> +#define MAPPING_TEST_COW(m) (((unsigned long)m & FS_DAX_MAPPING_COW) == \
> +
Introduce a FS_DAX_MAPPING_COW flag to support association with CoW file
mappings. In this case, the dax-RMAP already takes the responsibility
to look up for shared files by given dax page. The page->mapping is no
longer to used for rmap but for marking that this dax page is shared.
And to make
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