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Subject[PATCH] avoid one conditional branch in touch_atime()
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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>
--- linux-2.6.20-rc1-mm1/fs/inode.c 2006-12-14 02:14:23.000000000 +0100
+++ linux-2.6.20-rc1-mm1-ed/fs/inode.c 2006-12-15 20:14:31.000000000 +0100
@@ -1160,11 +1160,9 @@ void touch_atime(struct vfsmount *mnt, s
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;
--- linux-2.6.20-rc1-mm1/include/linux/fs.h 2006-12-15 15:46:16.000000000 +0100
+++ linux-2.6.20-rc1-mm1-ed/include/linux/fs.h 2006-12-15 20:16:13.000000000 +0100
@@ -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)
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