[PATCH 4/8] vfat: don't use ->d_time

From: Miklos Szeredi
Date: Wed Jun 22 2016 - 10:37:11 EST


Use d_fsdata instead, which is the same size. Introduce helpers to hide
the typecasts.

Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
---
fs/fat/namei_vfat.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 7092584f424a..cb27cd818572 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -21,6 +21,17 @@
#include <linux/namei.h>
#include "fat.h"

+static inline unsigned long vfat_d_version(struct dentry *dentry)
+{
+ return (unsigned long) dentry->d_fsdata;
+}
+
+static inline void vfat_d_version_set(struct dentry *dentry,
+ unsigned long version)
+{
+ dentry->d_fsdata = (void *) version;
+}
+
/*
* If new entry was created in the parent, it could create the 8.3
* alias (the shortname of logname). So, the parent may have the
@@ -33,7 +44,7 @@ static int vfat_revalidate_shortname(struct dentry *dentry)
{
int ret = 1;
spin_lock(&dentry->d_lock);
- if (dentry->d_time != d_inode(dentry->d_parent)->i_version)
+ if (vfat_d_version(dentry) != d_inode(dentry->d_parent)->i_version)
ret = 0;
spin_unlock(&dentry->d_lock);
return ret;
@@ -759,7 +770,7 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
if (!inode)
- dentry->d_time = dir->i_version;
+ vfat_d_version_set(dentry, dir->i_version);
return d_splice_alias(inode, dentry);
error:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -823,7 +834,7 @@ static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
clear_nlink(inode);
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
- dentry->d_time = dir->i_version;
+ vfat_d_version_set(dentry, dir->i_version);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);

@@ -849,7 +860,7 @@ static int vfat_unlink(struct inode *dir, struct dentry *dentry)
clear_nlink(inode);
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
- dentry->d_time = dir->i_version;
+ vfat_d_version_set(dentry, dir->i_version);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);

--
2.5.5