Commit 96cf51ac authored by Yuezhang Mo's avatar Yuezhang Mo Committed by Namjae Jeon
Browse files

exfat: do not sync parent dir if just update timestamp 



When sync or dir_sync is enabled, there is no need to sync the
parent directory's inode if only for updating its timestamp.

1. If an unexpected power failure occurs, the timestamp of the
   parent directory is not updated to the storage, which has no
   impact on the user.

2. The number of writes will be greatly reduced, which can not
   only improve performance, but also prolong device life.

Signed-off-by: default avatarYuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: default avatarAndy Wu <Andy.Wu@sony.com>
Reviewed-by: default avatarAoyama Wataru <wataru.aoyama@sony.com>
Reviewed-by: default avatarSungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent 4d714559

fs/exfat/namei.c

+8 −11
Original line number Diff line number Diff line
@@ -547,6 +547,7 @@ static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 
	struct exfat_dir_entry info;

	loff_t i_pos;

	int err;

	loff_t size = i_size_read(dir);



	mutex_lock(&EXFAT_SB(sb)->s_lock);

	exfat_set_volume_dirty(sb);
@@ -557,7 +558,7 @@ static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 


	inode_inc_iversion(dir);

	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));

	if (IS_DIRSYNC(dir))

	if (IS_DIRSYNC(dir) && size != i_size_read(dir))

		exfat_sync_inode(dir);

	else

		mark_inode_dirty(dir);
@@ -801,9 +802,6 @@ static int exfat_unlink(struct inode *dir, struct dentry *dentry) 
	inode_inc_iversion(dir);

	simple_inode_init_ts(dir);

	exfat_truncate_inode_atime(dir);

	if (IS_DIRSYNC(dir))

		exfat_sync_inode(dir);

	else

	mark_inode_dirty(dir);



	clear_nlink(inode);
@@ -825,6 +823,7 @@ static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 
	struct exfat_chain cdir;

	loff_t i_pos;

	int err;

	loff_t size = i_size_read(dir);



	mutex_lock(&EXFAT_SB(sb)->s_lock);

	exfat_set_volume_dirty(sb);
@@ -835,7 +834,7 @@ static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 


	inode_inc_iversion(dir);

	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));

	if (IS_DIRSYNC(dir))

	if (IS_DIRSYNC(dir) && size != i_size_read(dir))

		exfat_sync_inode(dir);

	else

		mark_inode_dirty(dir);
@@ -1239,6 +1238,7 @@ static int exfat_rename(struct mnt_idmap *idmap, 
	struct super_block *sb = old_dir->i_sb;

	loff_t i_pos;

	int err;

	loff_t size = i_size_read(new_dir);



	/*

	 * The VFS already checks for existence, so for local filesystems
@@ -1260,7 +1260,7 @@ static int exfat_rename(struct mnt_idmap *idmap, 
	simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);

	EXFAT_I(new_dir)->i_crtime = current_time(new_dir);

	exfat_truncate_inode_atime(new_dir);

	if (IS_DIRSYNC(new_dir))

	if (IS_DIRSYNC(new_dir) && size != i_size_read(new_dir))

		exfat_sync_inode(new_dir);

	else

		mark_inode_dirty(new_dir);
@@ -1281,9 +1281,6 @@ static int exfat_rename(struct mnt_idmap *idmap, 
	}



	inode_inc_iversion(old_dir);

	if (IS_DIRSYNC(old_dir))

		exfat_sync_inode(old_dir);

	else

	mark_inode_dirty(old_dir);



	if (new_inode) {