[RFC PATCH] selinux: remove redundant allocation and helper functions

[Paul Moore <paul@xxxxxxxxxxxxxx>]

This patch removes the inode, file, and superblock security blob
allocation functions and moves the associated code into the
respective LSM hooks.  This patch also removes the inode_doinit()
function as it was a trivial wrapper around
inode_doinit_with_dentry() and called from one location in the code.

Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
---
 security/selinux/hooks.c |   94 ++++++++++++++++++----------------------------
 1 file changed, 36 insertions(+), 58 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 2c84b12d50bc..1305fc51bfae 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -238,24 +238,6 @@ static inline u32 task_sid(const struct task_struct *task)
 	return sid;
 }
 
-/* Allocate and free functions for each kind of security blob. */
-
-static int inode_alloc_security(struct inode *inode)
-{
-	struct inode_security_struct *isec = selinux_inode(inode);
-	u32 sid = current_sid();
-
-	spin_lock_init(&isec->lock);
-	INIT_LIST_HEAD(&isec->list);
-	isec->inode = inode;
-	isec->sid = SECINITSID_UNLABELED;
-	isec->sclass = SECCLASS_FILE;
-	isec->task_sid = sid;
-	isec->initialized = LABEL_INVALID;
-
-	return 0;
-}
-
 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
 
 /*
@@ -354,37 +336,6 @@ static void inode_free_security(struct inode *inode)
 	}
 }
 
-static int file_alloc_security(struct file *file)
-{
-	struct file_security_struct *fsec = selinux_file(file);
-	u32 sid = current_sid();
-
-	fsec->sid = sid;
-	fsec->fown_sid = sid;
-
-	return 0;
-}
-
-static int superblock_alloc_security(struct super_block *sb)
-{
-	struct superblock_security_struct *sbsec;
-
-	sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
-	if (!sbsec)
-		return -ENOMEM;
-
-	mutex_init(&sbsec->lock);
-	INIT_LIST_HEAD(&sbsec->isec_head);
-	spin_lock_init(&sbsec->isec_lock);
-	sbsec->sb = sb;
-	sbsec->sid = SECINITSID_UNLABELED;
-	sbsec->def_sid = SECINITSID_FILE;
-	sbsec->mntpoint_sid = SECINITSID_UNLABELED;
-	sb->s_security = sbsec;
-
-	return 0;
-}
-
 static void superblock_free_security(struct super_block *sb)
 {
 	struct superblock_security_struct *sbsec = sb->s_security;
@@ -406,11 +357,6 @@ static void selinux_free_mnt_opts(void *mnt_opts)
 	kfree(opts);
 }
 
-static inline int inode_doinit(struct inode *inode)
-{
-	return inode_doinit_with_dentry(inode, NULL);
-}
-
 enum {
 	Opt_error = -1,
 	Opt_context = 0,
@@ -598,7 +544,7 @@ static int sb_finish_set_opts(struct super_block *sb)
 		inode = igrab(inode);
 		if (inode) {
 			if (!IS_PRIVATE(inode))
-				inode_doinit(inode);
+				inode_doinit_with_dentry(inode, NULL);
 			iput(inode);
 		}
 		spin_lock(&sbsec->isec_lock);
@@ -2593,7 +2539,22 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 
 static int selinux_sb_alloc_security(struct super_block *sb)
 {
-	return superblock_alloc_security(sb);
+	struct superblock_security_struct *sbsec;
+
+	sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
+	if (!sbsec)
+		return -ENOMEM;
+
+	mutex_init(&sbsec->lock);
+	INIT_LIST_HEAD(&sbsec->isec_head);
+	spin_lock_init(&sbsec->isec_lock);
+	sbsec->sb = sb;
+	sbsec->sid = SECINITSID_UNLABELED;
+	sbsec->def_sid = SECINITSID_FILE;
+	sbsec->mntpoint_sid = SECINITSID_UNLABELED;
+	sb->s_security = sbsec;
+
+	return 0;
 }
 
 static void selinux_sb_free_security(struct super_block *sb)
@@ -2845,7 +2806,18 @@ static int selinux_fs_context_parse_param(struct fs_context *fc,
 
 static int selinux_inode_alloc_security(struct inode *inode)
 {
-	return inode_alloc_security(inode);
+	struct inode_security_struct *isec = selinux_inode(inode);
+	u32 sid = current_sid();
+
+	spin_lock_init(&isec->lock);
+	INIT_LIST_HEAD(&isec->list);
+	isec->inode = inode;
+	isec->sid = SECINITSID_UNLABELED;
+	isec->sclass = SECCLASS_FILE;
+	isec->task_sid = sid;
+	isec->initialized = LABEL_INVALID;
+
+	return 0;
 }
 
 static void selinux_inode_free_security(struct inode *inode)
@@ -3555,7 +3527,13 @@ static int selinux_file_permission(struct file *file, int mask)
 
 static int selinux_file_alloc_security(struct file *file)
 {
-	return file_alloc_security(file);
+	struct file_security_struct *fsec = selinux_file(file);
+	u32 sid = current_sid();
+
+	fsec->sid = sid;
+	fsec->fown_sid = sid;
+
+	return 0;
 }
 
 /*