exfat: convert exfat_add_entry() to use dentry cache

After this conversion, if "dirsync" or "sync" is enabled, the
number of synchronized dentries in exfat_add_entry() will change
from 2 to 1.
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Andy Wu <Andy.Wu@sony.com>
Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

fs/exfat/dir.c

@@ -448,53 +448,34 @@ static void exfat_init_name_entry(struct exfat_dentry *ep,
 	}
 }
 
-int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
-		int entry, unsigned int type, unsigned int start_clu,
-		unsigned long long size)
+void exfat_init_dir_entry(struct exfat_entry_set_cache *es,
+		unsigned int type, unsigned int start_clu,
+		unsigned long long size, struct timespec64 *ts)
 {
-	struct super_block *sb = inode->i_sb;
+	struct super_block *sb = es->sb;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
-	struct timespec64 ts = current_time(inode);
 	struct exfat_dentry *ep;
-	struct buffer_head *bh;
-
-	/*
-	 * We cannot use exfat_get_dentry_set here because file ep is not
-	 * initialized yet.
-	 */
-	ep = exfat_get_dentry(sb, p_dir, entry, &bh);
-	if (!ep)
-		return -EIO;
 
+	ep = exfat_get_dentry_cached(es, ES_IDX_FILE);
 	exfat_set_entry_type(ep, type);
-	exfat_set_entry_time(sbi, &ts,
+	exfat_set_entry_time(sbi, ts,
 			&ep->dentry.file.create_tz,
 			&ep->dentry.file.create_time,
 			&ep->dentry.file.create_date,
 			&ep->dentry.file.create_time_cs);
-	exfat_set_entry_time(sbi, &ts,
+	exfat_set_entry_time(sbi, ts,
 			&ep->dentry.file.modify_tz,
 			&ep->dentry.file.modify_time,
 			&ep->dentry.file.modify_date,
 			&ep->dentry.file.modify_time_cs);
-	exfat_set_entry_time(sbi, &ts,
+	exfat_set_entry_time(sbi, ts,
 			&ep->dentry.file.access_tz,
 			&ep->dentry.file.access_time,
 			&ep->dentry.file.access_date,
 			NULL);
 
-	exfat_update_bh(bh, IS_DIRSYNC(inode));
-	brelse(bh);
-
-	ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh);
-	if (!ep)
-		return -EIO;
-
+	ep = exfat_get_dentry_cached(es, ES_IDX_STREAM);
 	exfat_init_stream_entry(ep, start_clu, size);
-	exfat_update_bh(bh, IS_DIRSYNC(inode));
-	brelse(bh);
-
-	return 0;
 }
 
 int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,

fs/exfat/exfat_fs.h

@@ -480,9 +480,9 @@ int exfat_get_cluster(struct inode *inode, unsigned int cluster,
 extern const struct inode_operations exfat_dir_inode_operations;
 extern const struct file_operations exfat_dir_operations;
 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);
-int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
-		int entry, unsigned int type, unsigned int start_clu,
-		unsigned long long size);
+void exfat_init_dir_entry(struct exfat_entry_set_cache *es,
+		unsigned int type, unsigned int start_clu,
+		unsigned long long size, struct timespec64 *ts);
 int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 		int entry, int num_entries, struct exfat_uni_name *p_uniname);
 int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,

fs/exfat/namei.c

@@ -499,6 +499,8 @@ static int exfat_add_entry(struct inode *inode, const char *path,
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	struct exfat_uni_name uniname;
 	struct exfat_chain clu;
+	struct timespec64 ts = current_time(inode);
+	struct exfat_entry_set_cache es;
 	int clu_size = 0;
 	unsigned int start_clu = EXFAT_FREE_CLUSTER;
 
@@ -531,8 +533,14 @@ static int exfat_add_entry(struct inode *inode, const char *path,
 	/* fill the dos name directory entry information of the created file.
 	 * the first cluster is not determined yet. (0)
 	 */
-	ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
-		start_clu, clu_size);
+
+	ret = exfat_get_empty_dentry_set(&es, sb, p_dir, dentry, num_entries);
+	if (ret)
+		goto out;
+
+	exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts);
+
+	ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
 	if (ret)
 		goto out;