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 page by searching NAT suggested by Jaegeuk Kim.
o add 'unlikely' for compiler optimization suggested by Jaegeuk Kim.
Suggested-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
fs/f2fs/node.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 099f06f..4c6da98 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1600,13 +1600,46 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
return 0;
}
+/*
+ * f2fs_cache_node_page() check validaty of input page by searching NAT.
+ * Then, it will copy updated data of vaild page to node_inode cache.
+ */
+void f2fs_cache_node_page(struct f2fs_sb_info *sbi, struct page *page,
+ nid_t nid, block_t blkaddr)
+{
+ struct address_space *mapping = sbi->node_inode->i_mapping;
+ struct page *npage;
+ struct node_info ni;
+
+ get_node_info(sbi, nid, &ni);
+
+ if (ni.blk_addr != blkaddr)
+ return;
+
+ npage = grab_cache_page(mapping, nid);
+ if (unlikely(!npage))
+ return;
+
+ if (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)
{
struct f2fs_node *rn;
struct f2fs_summary *sum_entry;
struct page *page, *tmp;
- block_t addr;
+ block_t addr, blkaddr;
int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
int i, last_offset, nrpages, err = 0;
LIST_HEAD(page_list);
@@ -1624,6 +1657,7 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
if (err)
return err;
+ blkaddr = addr;
list_for_each_entry_safe(page, tmp, &page_list, lru) {
lock_page(page);
@@ -1633,6 +1667,8 @@ 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), blkaddr);
} else {
err = -EIO;
}
@@ -1640,6 +1676,7 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
list_del(&page->lru);
unlock_page(page);
__free_pages(page, 0);
+ blkaddr++;
}
}
return err;
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
