[PATCH] avoid one conditional branch in touch_atime()

I added IS_NOATIME(inode) macro definition in include/linux/fs.h, true if
the inode superblock is marked readonly or noatime.

This new macro is then used in touch_atime() instead of separatly testing
MS_RDONLY and MS_NOATIME

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 3 deletions

diff --git a/fs/inode.c b/fs/inode.c
index bf21dc6d0dbd..6cacdab25e0a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1160,11 +1160,9 @@ void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
         struct inode *inode = dentry->d_inode;
         struct timespec now;
 
-        if (IS_RDONLY(inode))
-                return;
         if (inode->i_flags & S_NOATIME)
                 return;
-        if (inode->i_sb->s_flags & MS_NOATIME)
+        if (IS_NOATIME(inode))
                 return;
         if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))
                 return;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1410e5330c8d..822c545c7209 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -169,6 +169,7 @@ extern int dir_notify_enable;
 #define IS_DIRSYNC(inode)       (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
                                         ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
 #define IS_MANDLOCK(inode)      __IS_FLG(inode, MS_MANDLOCK)
+#define IS_NOATIME(inode)   __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
 
 #define IS_NOQUOTA(inode)       ((inode)->i_flags & S_NOQUOTA)
 #define IS_APPEND(inode)        ((inode)->i_flags & S_APPEND)