This patch introduces f2fs_cache_node_page(), in this function, page which is
readed ahead will be copy to node_inode's mapping cache.
It will avoid rereading these node pages.
change log:
o check validity of grabbed page suggested by Jaegeuk Kim.
Suggested-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
fs/f2fs/node.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 099f06f..3ff98fa 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1600,6 +1600,39 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
return 0;
}
+/*
+ * f2fs_cache_node_page() copy updated page data to node_inode cache page.
+ */
+void f2fs_cache_node_page(struct f2fs_sb_info *sbi, struct page *page,
+ nid_t nid)
+{
+ struct address_space *mapping = sbi->node_inode->i_mapping;
+ struct page *npage;
+
+ npage = find_get_page(mapping, nid);
+ if (unlikely(npage && PageUptodate(npage))) {
+ f2fs_put_page(npage, 0);
+ return;
+ }
+ f2fs_put_page(npage, 0);
+
+ npage = grab_cache_page(mapping, nid);
+ if (unlikely(!npage))
+ return;
+
+ if (unlikely(PageUptodate(npage))) {
+ f2fs_put_page(npage, 1);
+ return;
+ }
+
+ memcpy(page_address(npage), page_address(page), PAGE_CACHE_SIZE);
+
+ SetPageUptodate(npage);
+ f2fs_put_page(npage, 1);
+
+ return;
+}
+
int restore_node_summary(struct f2fs_sb_info *sbi,
unsigned int segno, struct f2fs_summary_block *sum)
{
@@ -1633,6 +1666,8 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
sum_entry->version = 0;
sum_entry->ofs_in_node = 0;
sum_entry++;
+ f2fs_cache_node_page(sbi, page,
+ le32_to_cpu(rn->footer.nid));
} else {
err = -EIO;
}
--
1.7.9.5
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