f2fs: introduce fi->i_sem to protect fi's info
This patch introduces fi->i_sem to protect fi's info that includes xattr_ver,
pino, i_nlink.
This enables to remove i_mutex during f2fs_sync_file, resulting in performance
improvement when a number of fsync calls are triggered from many concurrent
threads.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 89d0422..8419130 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -590,7 +590,10 @@
f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
+ /* protect xattr_ver */
+ down_write(&F2FS_I(inode)->i_sem);
err = __f2fs_setxattr(inode, name_index, name, value, value_len, ipage);
+ up_write(&F2FS_I(inode)->i_sem);
f2fs_unlock_op(sbi);
return err;