[PATCH V4 8/9] fsverity: Move verity status check to fsverity_file_open

[Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>]

Instead of conditionally checking for verity status of an inode before
invoking fsverity_file_open(), this commit moves the check inside the
definition of fsverity_file_open().

Signed-off-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
---
 fs/ext4/file.c           | 8 +++-----
 fs/f2fs/file.c           | 8 +++-----
 fs/verity/setup.c        | 3 +++
 include/linux/fsverity.h | 5 ++++-
 4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 30fbd663354f..b404a857cd48 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -444,11 +444,9 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 	if (ret)
 		return ret;
 
-	if (IS_VERITY(inode)) {
-		ret = fsverity_file_open(inode, filp);
-		if (ret)
-			return ret;
-	}
+	ret = fsverity_file_open(inode, filp);
+	if (ret)
+		return ret;
 
 	/*
 	 * Set up the jbd2_inode if we are opening the inode for
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 2eb4821d95d1..925c0d9608da 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -491,11 +491,9 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
 	if (err)
 		return err;
 
-	if (IS_VERITY(inode)) {
-		err = fsverity_file_open(inode, filp);
-		if (err)
-			return err;
-	}
+	err = fsverity_file_open(inode, filp);
+	if (err)
+		return err;
 
 	filp->f_mode |= FMODE_NOWAIT;
 
diff --git a/fs/verity/setup.c b/fs/verity/setup.c
index 08b609127531..bc463dc601b1 100644
--- a/fs/verity/setup.c
+++ b/fs/verity/setup.c
@@ -771,6 +771,9 @@ static int setup_fsverity_info(struct inode *inode)
  */
 int fsverity_file_open(struct inode *inode, struct file *filp)
 {
+	if (!IS_VERITY(inode))
+		return 0;
+
 	if (filp->f_mode & FMODE_WRITE) {
 		pr_debug("Denying opening verity file (ino %lu) for write\n",
 			 inode->i_ino);
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index ea8c418bd7d5..c770025606e1 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -60,7 +60,10 @@ static inline int fsverity_ioctl_measure(struct file *filp, void __user *arg)
 
 static inline int fsverity_file_open(struct inode *inode, struct file *filp)
 {
-	return -EOPNOTSUPP;
+	if (IS_VERITY(inode))
+		return -EOPNOTSUPP;
+
+	return 0;
 }
 
 static inline int fsverity_prepare_setattr(struct dentry *dentry,
-- 
2.19.1