vfat_revalidate{,_ci}(): use stable parent inode passed by caller

Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Al Viro <[email protected]>

Author: Al Viro

fs/fat/namei_vfat.c

@@ -43,14 +43,9 @@ static inline void vfat_d_version_set(struct dentry *dentry,
  * If it happened, the negative dentry isn't actually negative
  * anymore.  So, drop it.
  */
-static int vfat_revalidate_shortname(struct dentry *dentry)
+static bool vfat_revalidate_shortname(struct dentry *dentry, struct inode *dir)
 {
-	int ret = 1;
-	spin_lock(&dentry->d_lock);
-	if (!inode_eq_iversion(d_inode(dentry->d_parent), vfat_d_version(dentry)))
-		ret = 0;
-	spin_unlock(&dentry->d_lock);
-	return ret;
+	return inode_eq_iversion(dir, vfat_d_version(dentry));
 }
 
 static int vfat_revalidate(struct inode *dir, const struct qstr *name,
@@ -62,7 +57,7 @@ static int vfat_revalidate(struct inode *dir, const struct qstr *name,
 	/* This is not negative dentry. Always valid. */
 	if (d_really_is_positive(dentry))
 		return 1;
-	return vfat_revalidate_shortname(dentry);
+	return vfat_revalidate_shortname(dentry, dir);
 }
 
 static int vfat_revalidate_ci(struct inode *dir, const struct qstr *name,
@@ -99,7 +94,7 @@ static int vfat_revalidate_ci(struct inode *dir, const struct qstr *name,
 	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
 		return 0;
 
-	return vfat_revalidate_shortname(dentry);
+	return vfat_revalidate_shortname(dentry, dir);
 }
 
 /* returns the length of a struct qstr, ignoring trailing dots */