Hi Jaegeuk,
We should call flush_dcache_page before kunmap because the purpose of the cache flush is to address aliasing problem related to virtual address.
On Wed, Nov 19, 2014 at 02:35:08PM -0800, Jaegeuk Kim wrote:
> Whenever f2fs updates mapped pages, it needs to call flush_dcache_page.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> ---
> fs/f2fs/dir.c | 7 ++++++-
> fs/f2fs/inline.c | 4 +++-
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index 5a49995..312fbfc 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -287,8 +287,10 @@ void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
> f2fs_wait_on_page_writeback(page, type);
> de->ino = cpu_to_le32(inode->i_ino);
> set_de_type(de, inode);
> - if (!f2fs_has_inline_dentry(dir))
> + if (!f2fs_has_inline_dentry(dir)) {
> kunmap(page);
> + flush_dcache_page(page);
> + }
> set_page_dirty(page);
> dir->i_mtime = dir->i_ctime = CURRENT_TIME;
> mark_inode_dirty(dir);
> @@ -366,6 +368,7 @@ static int make_empty_dir(struct inode *inode,
> do_make_empty_dir(inode, parent, &d);
>
> kunmap_atomic(dentry_blk);
> + flush_dcache_page(dentry_page);
>
> set_page_dirty(dentry_page);
> f2fs_put_page(dentry_page, 1);
> @@ -579,6 +582,7 @@ fail:
> clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
> }
> kunmap(dentry_page);
> + flush_dcache_page(dentry_page);
> f2fs_put_page(dentry_page, 1);
> return err;
> }
> @@ -661,6 +665,7 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
> NR_DENTRY_IN_BLOCK,
> 0);
> kunmap(page); /* kunmap - pair of f2fs_find_entry */
> + flush_dcache_page(page);
> set_page_dirty(page);
>
> dir->i_ctime = dir->i_mtime = CURRENT_TIME;
> diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
> index f26fb87..8b7cc51 100644
> --- a/fs/f2fs/inline.c
> +++ b/fs/f2fs/inline.c
> @@ -45,8 +45,8 @@ void read_inline_data(struct page *page, struct page *ipage)
> src_addr = inline_data_addr(ipage);
> dst_addr = kmap_atomic(page);
> memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
> - flush_dcache_page(page);
> kunmap_atomic(dst_addr);
> + flush_dcache_page(page);
> SetPageUptodate(page);
> }
>
> @@ -107,6 +107,7 @@ int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
> dst_addr = kmap_atomic(page);
> memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
> kunmap_atomic(dst_addr);
> + flush_dcache_page(page);
> SetPageUptodate(page);
> no_update:
> /* write data page to try to make data consistent */
> @@ -358,6 +359,7 @@ static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
> NR_INLINE_DENTRY * F2FS_SLOT_LEN);
>
> kunmap_atomic(dentry_blk);
> + flush_dcache_page(page);
> SetPageUptodate(page);
> set_page_dirty(page);
>
> --
> 2.1.1
>
>
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