[f2fs-dev][PATCH 2/2] f2fs: enable recover_xattr_data to avoid cp when fsync after operating xattr

[Chao Yu <chao2.yu@samsung.com>]

Now if we call fsync() after we update the xattr date belongs to the file, f2fs
will do checkpoint to keep data.
This can cause low performance because checkpoint block most operation and write
lots of blocks. So we'd better to avoid doing checkpoint by writing modified
xattr node page to warm node segment, and then it can be recovered when we mount
this device later on.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
---
 fs/f2fs/f2fs.h     |  3 +--
 fs/f2fs/file.c     |  3 ---
 fs/f2fs/node.c     | 28 ++++++++++++++++------------
 fs/f2fs/node.h     |  2 +-
 fs/f2fs/recovery.c |  4 +++-
 fs/f2fs/xattr.c    |  3 ---
 6 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c48847e..dfbdd64 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -301,7 +301,6 @@ struct f2fs_inode_info {
 	f2fs_hash_t chash;		/* hash value of given file name */
 	unsigned int clevel;		/* maximum level of given file name */
 	nid_t i_xattr_nid;		/* node id that contains xattrs */
-	unsigned long long xattr_ver;	/* cp version of xattr modification */
 	struct extent_info ext;		/* in-memory extent cache entry */
 	struct inode_entry *dirty_dir;	/* the pointer of dirty dir */
 
@@ -1391,7 +1390,7 @@ bool alloc_nid(struct f2fs_sb_info *, nid_t *);
 void alloc_nid_done(struct f2fs_sb_info *, nid_t);
 void alloc_nid_failed(struct f2fs_sb_info *, nid_t);
 void recover_inline_xattr(struct inode *, struct page *);
-void recover_xattr_data(struct inode *, struct page *, block_t);
+int recover_xattr_data(struct inode *, struct page *, block_t);
 int recover_inode_page(struct f2fs_sb_info *, struct page *);
 int restore_node_summary(struct f2fs_sb_info *, unsigned int,
 				struct f2fs_summary_block *);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f172ddc4..fb26a43 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -129,8 +129,6 @@ static inline bool need_do_checkpoint(struct inode *inode)
 		need_cp = true;
 	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
 		need_cp = true;
-	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
-		need_cp = true;
 	else if (test_opt(sbi, FASTBOOT))
 		need_cp = true;
 	else if (sbi->active_logs == 2)
@@ -156,7 +154,6 @@ static void try_to_fix_pino(struct inode *inode)
 	nid_t pino;
 
 	down_write(&fi->i_sem);
-	fi->xattr_ver = 0;
 	if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
 			get_parent_ino(inode, &pino)) {
 		fi->i_pino = pino;
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index a7cb0db..675fa65 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -863,9 +863,6 @@ int truncate_xattr_node(struct inode *inode, struct page *page)
 
 	F2FS_I(inode)->i_xattr_nid = 0;
 
-	/* need to do checkpoint during fsync */
-	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
-
 	set_new_dnode(&dn, inode, page, npage, nid);
 
 	if (page)
@@ -1655,12 +1652,13 @@ update_inode:
 	f2fs_put_page(ipage, 1);
 }
 
-void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
+int recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
 	nid_t new_xnid = nid_of_node(page);
 	struct node_info ni;
+	struct page *xpage;
 
 	/* 1: invalidate the previous xattr nid */
 	if (!prev_xnid)
@@ -1674,21 +1672,27 @@ void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
 	set_node_addr(sbi, &ni, NULL_ADDR, false);
 
 recover_xnid:
-	/* 2: allocate new xattr nid */
+	/* 2: update xattr nid in inode */
+	remove_free_nid(NM_I(sbi), new_xnid);
+	F2FS_I(inode)->i_xattr_nid = new_xnid;
 	if (unlikely(!inc_valid_node_count(sbi, inode)))
 		f2fs_bug_on(sbi, 1);
+	update_inode_page(inode);
+
+	/* 3: update and make xattr node page dirty */
+	xpage = grab_cache_page(NODE_MAPPING(sbi), new_xnid);
+	if (!xpage)
+		return -ENOMEM;
+
+	memcpy(F2FS_NODE(xpage), F2FS_NODE(page), PAGE_CACHE_SIZE);
 
-	remove_free_nid(NM_I(sbi), new_xnid);
 	get_node_info(sbi, new_xnid, &ni);
 	ni.ino = inode->i_ino;
 	set_node_addr(sbi, &ni, NEW_ADDR, false);
-	F2FS_I(inode)->i_xattr_nid = new_xnid;
+	set_page_dirty(xpage);
+	f2fs_put_page(xpage, 1);
 
-	/* 3: update xattr blkaddr */
-	refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
-	set_node_addr(sbi, &ni, blkaddr, false);
-
-	update_inode_page(inode);
+	return 0;
 }
 
 int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index cac8a3d..55eb1e7 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -300,7 +300,7 @@ static inline bool IS_DNODE(struct page *node_page)
 	unsigned int ofs = ofs_of_node(node_page);
 
 	if (f2fs_has_xattr_block(ofs))
-		return false;
+		return true;
 
 	if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK ||
 			ofs == 5 + 2 * NIDS_PER_BLOCK)
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 9160a37..4f2c197 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -346,7 +346,9 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 	if (IS_INODE(page)) {
 		recover_inline_xattr(inode, page);
 	} else if (f2fs_has_xattr_block(ofs_of_node(page))) {
-		recover_xattr_data(inode, page, blkaddr);
+		err = recover_xattr_data(inode, page, blkaddr);
+		if (!err)
+			recovered++;
 		goto out;
 	}
 
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 5072bf9..3d13ca2 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -391,9 +391,6 @@ static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
 						sizeof(struct node_footer));
 	set_page_dirty(xpage);
 	f2fs_put_page(xpage, 1);
-
-	/* need to checkpoint during fsync */
-	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
 	return 0;
 }
 
-- 
2.2.1