VFS: security/: d_backing_inode() annotations

most of the ->d_inode uses there refer to the same inode IO would
go to, i.e. d_backing_inode()
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

security/apparmor/file.c

@@ -259,7 +259,7 @@ unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
  */
 static inline bool is_deleted(struct dentry *dentry)
 {
-	if (d_unlinked(dentry) && dentry->d_inode->i_nlink == 0)
+	if (d_unlinked(dentry) && d_backing_inode(dentry)->i_nlink == 0)
 		return 1;
 	return 0;
 }
@@ -351,8 +351,8 @@ int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry,
 	struct path link = { new_dir->mnt, new_dentry };
 	struct path target = { new_dir->mnt, old_dentry };
 	struct path_cond cond = {
-		old_dentry->d_inode->i_uid,
-		old_dentry->d_inode->i_mode
+		d_backing_inode(old_dentry)->i_uid,
+		d_backing_inode(old_dentry)->i_mode
 	};
 	char *buffer = NULL, *buffer2 = NULL;
 	const char *lname, *tname = NULL, *info = NULL;

security/apparmor/lsm.c

@@ -204,8 +204,8 @@ static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
 				  struct dentry *dentry, u32 mask)
 {
 	struct path path = { mnt, dentry };
-	struct path_cond cond = { dentry->d_inode->i_uid,
-				  dentry->d_inode->i_mode
+	struct path_cond cond = { d_backing_inode(dentry)->i_uid,
+				  d_backing_inode(dentry)->i_mode
 	};
 
 	return common_perm(op, &path, mask, &cond);
@@ -223,7 +223,7 @@ static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
 static int common_perm_rm(int op, struct path *dir,
 			  struct dentry *dentry, u32 mask)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct path_cond cond = { };
 
 	if (!inode || !dir->mnt || !mediated_filesystem(dentry))
@@ -281,8 +281,8 @@ static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
 
 static int apparmor_path_truncate(struct path *path)
 {
-	struct path_cond cond = { path->dentry->d_inode->i_uid,
-				  path->dentry->d_inode->i_mode
+	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
+				  d_backing_inode(path->dentry)->i_mode
 	};
 
 	if (!path->mnt || !mediated_filesystem(path->dentry))
@@ -327,8 +327,8 @@ static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
 	if (!unconfined(profile)) {
 		struct path old_path = { old_dir->mnt, old_dentry };
 		struct path new_path = { new_dir->mnt, new_dentry };
-		struct path_cond cond = { old_dentry->d_inode->i_uid,
-					  old_dentry->d_inode->i_mode
+		struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
+					  d_backing_inode(old_dentry)->i_mode
 		};
 
 		error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
@@ -354,8 +354,8 @@ static int apparmor_path_chmod(struct path *path, umode_t mode)
 
 static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid)
 {
-	struct path_cond cond =  { path->dentry->d_inode->i_uid,
-				   path->dentry->d_inode->i_mode
+	struct path_cond cond =  { d_backing_inode(path->dentry)->i_uid,
+				   d_backing_inode(path->dentry)->i_mode
 	};
 
 	if (!mediated_filesystem(path->dentry))

security/commoncap.c

@@ -297,7 +297,7 @@ static inline void bprm_clear_caps(struct linux_binprm *bprm)
  */
 int cap_inode_need_killpriv(struct dentry *dentry)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	int error;
 
 	if (!inode->i_op->getxattr)
@@ -319,7 +319,7 @@ int cap_inode_need_killpriv(struct dentry *dentry)
  */
 int cap_inode_killpriv(struct dentry *dentry)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 
 	if (!inode->i_op->removexattr)
 	       return 0;
@@ -375,7 +375,7 @@ static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps,
  */
 int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	__u32 magic_etc;
 	unsigned tocopy, i;
 	int size;

security/integrity/evm/evm_crypto.c

@@ -131,7 +131,7 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry,
 				size_t req_xattr_value_len,
 				char type, char *digest)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct shash_desc *desc;
 	char **xattrname;
 	size_t xattr_size = 0;
@@ -199,7 +199,7 @@ int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
 int evm_update_evmxattr(struct dentry *dentry, const char *xattr_name,
 			const char *xattr_value, size_t xattr_value_len)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct evm_ima_xattr_data xattr_data;
 	int rc = 0;
 

security/integrity/evm/evm_main.c

@@ -72,7 +72,7 @@ static void __init evm_init_config(void)
 
 static int evm_find_protected_xattrs(struct dentry *dentry)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	char **xattr;
 	int error;
 	int count = 0;
@@ -165,8 +165,8 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 			/* Replace RSA with HMAC if not mounted readonly and
 			 * not immutable
 			 */
-			if (!IS_RDONLY(dentry->d_inode) &&
-			    !IS_IMMUTABLE(dentry->d_inode))
+			if (!IS_RDONLY(d_backing_inode(dentry)) &&
+			    !IS_IMMUTABLE(d_backing_inode(dentry)))
 				evm_update_evmxattr(dentry, xattr_name,
 						    xattr_value,
 						    xattr_value_len);
@@ -235,7 +235,7 @@ enum integrity_status evm_verifyxattr(struct dentry *dentry,
 		return INTEGRITY_UNKNOWN;
 
 	if (!iint) {
-		iint = integrity_iint_find(dentry->d_inode);
+		iint = integrity_iint_find(d_backing_inode(dentry));
 		if (!iint)
 			return INTEGRITY_UNKNOWN;
 	}
@@ -253,7 +253,7 @@ EXPORT_SYMBOL_GPL(evm_verifyxattr);
  */
 static enum integrity_status evm_verify_current_integrity(struct dentry *dentry)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 
 	if (!evm_initialized || !S_ISREG(inode->i_mode) || evm_fixmode)
 		return 0;
@@ -293,13 +293,13 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
 	if (evm_status == INTEGRITY_NOXATTRS) {
 		struct integrity_iint_cache *iint;
 
-		iint = integrity_iint_find(dentry->d_inode);
+		iint = integrity_iint_find(d_backing_inode(dentry));
 		if (iint && (iint->flags & IMA_NEW_FILE))
 			return 0;
 	}
 out:
 	if (evm_status != INTEGRITY_PASS)
-		integrity_audit_msg(AUDIT_INTEGRITY_METADATA, dentry->d_inode,
+		integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
 				    dentry->d_name.name, "appraise_metadata",
 				    integrity_status_msg[evm_status],
 				    -EPERM, 0);
@@ -379,7 +379,7 @@ void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
  */
 void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 
 	if (!evm_initialized || !evm_protected_xattr(xattr_name))
 		return;
@@ -404,7 +404,7 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
 	if ((evm_status == INTEGRITY_PASS) ||
 	    (evm_status == INTEGRITY_NOXATTRS))
 		return 0;
-	integrity_audit_msg(AUDIT_INTEGRITY_METADATA, dentry->d_inode,
+	integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
 			    dentry->d_name.name, "appraise_metadata",
 			    integrity_status_msg[evm_status], -EPERM, 0);
 	return -EPERM;

security/integrity/ima/ima_appraise.c

@@ -165,7 +165,7 @@ void ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len,
 int ima_read_xattr(struct dentry *dentry,
 		   struct evm_ima_xattr_data **xattr_value)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 
 	if (!inode->i_op->getxattr)
 		return 0;
@@ -190,7 +190,7 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
 	static const char op[] = "appraise_data";
 	char *cause = "unknown";
 	struct dentry *dentry = file->f_path.dentry;
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	enum integrity_status status = INTEGRITY_UNKNOWN;
 	int rc = xattr_len, hash_start = 0;
 
@@ -314,7 +314,7 @@ void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file)
  */
 void ima_inode_post_setattr(struct dentry *dentry)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct integrity_iint_cache *iint;
 	int must_appraise, rc;
 
@@ -380,7 +380,7 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 	if (result == 1) {
 		if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST))
 			return -EINVAL;
-		ima_reset_appraise_flags(dentry->d_inode,
+		ima_reset_appraise_flags(d_backing_inode(dentry),
 			 (xvalue->type == EVM_IMA_XATTR_DIGSIG) ? 1 : 0);
 		result = 0;
 	}
@@ -393,7 +393,7 @@ int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name)
 
 	result = ima_protect_xattr(dentry, xattr_name, NULL, 0);
 	if (result == 1) {
-		ima_reset_appraise_flags(dentry->d_inode, 0);
+		ima_reset_appraise_flags(d_backing_inode(dentry), 0);
 		result = 0;
 	}
 	return result;

security/lsm_audit.c

@@ -237,7 +237,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
 
 		audit_log_d_path(ab, " path=", &a->u.path);
 
-		inode = a->u.path.dentry->d_inode;
+		inode = d_backing_inode(a->u.path.dentry);
 		if (inode) {
 			audit_log_format(ab, " dev=");
 			audit_log_untrustedstring(ab, inode->i_sb->s_id);
@@ -251,7 +251,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
 		audit_log_format(ab, " name=");
 		audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
 
-		inode = a->u.dentry->d_inode;
+		inode = d_backing_inode(a->u.dentry);
 		if (inode) {
 			audit_log_format(ab, " dev=");
 			audit_log_untrustedstring(ab, inode->i_sb->s_id);

security/security.c

@@ -410,7 +410,7 @@ EXPORT_SYMBOL(security_old_inode_init_security);
 int security_path_mknod(struct path *dir, struct dentry *dentry, umode_t mode,
 			unsigned int dev)
 {
-	if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
 		return 0;
 	return security_ops->path_mknod(dir, dentry, mode, dev);
 }
@@ -418,7 +418,7 @@ EXPORT_SYMBOL(security_path_mknod);
 
 int security_path_mkdir(struct path *dir, struct dentry *dentry, umode_t mode)
 {
-	if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
 		return 0;
 	return security_ops->path_mkdir(dir, dentry, mode);
 }
@@ -426,14 +426,14 @@ EXPORT_SYMBOL(security_path_mkdir);
 
 int security_path_rmdir(struct path *dir, struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
 		return 0;
 	return security_ops->path_rmdir(dir, dentry);
 }
 
 int security_path_unlink(struct path *dir, struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
 		return 0;
 	return security_ops->path_unlink(dir, dentry);
 }
@@ -442,7 +442,7 @@ EXPORT_SYMBOL(security_path_unlink);
 int security_path_symlink(struct path *dir, struct dentry *dentry,
 			  const char *old_name)
 {
-	if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
 		return 0;
 	return security_ops->path_symlink(dir, dentry, old_name);
 }
@@ -450,7 +450,7 @@ int security_path_symlink(struct path *dir, struct dentry *dentry,
 int security_path_link(struct dentry *old_dentry, struct path *new_dir,
 		       struct dentry *new_dentry)
 {
-	if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
 		return 0;
 	return security_ops->path_link(old_dentry, new_dir, new_dentry);
 }
@@ -459,8 +459,8 @@ int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
 			 struct path *new_dir, struct dentry *new_dentry,
 			 unsigned int flags)
 {
-	if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
-		     (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
+	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
+		     (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
 		return 0;
 
 	if (flags & RENAME_EXCHANGE) {
@@ -477,21 +477,21 @@ EXPORT_SYMBOL(security_path_rename);
 
 int security_path_truncate(struct path *path)
 {
-	if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
 		return 0;
 	return security_ops->path_truncate(path);
 }
 
 int security_path_chmod(struct path *path, umode_t mode)
 {
-	if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
 		return 0;
 	return security_ops->path_chmod(path, mode);
 }
 
 int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
 {
-	if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
 		return 0;
 	return security_ops->path_chown(path, uid, gid);
 }
@@ -513,14 +513,14 @@ EXPORT_SYMBOL_GPL(security_inode_create);
 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
 			 struct dentry *new_dentry)
 {
-	if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
 		return 0;
 	return security_ops->inode_link(old_dentry, dir, new_dentry);
 }
 
 int security_inode_unlink(struct inode *dir, struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_unlink(dir, dentry);
 }
@@ -543,7 +543,7 @@ EXPORT_SYMBOL_GPL(security_inode_mkdir);
 
 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_rmdir(dir, dentry);
 }
@@ -559,8 +559,8 @@ int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
 			   struct inode *new_dir, struct dentry *new_dentry,
 			   unsigned int flags)
 {
-        if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
-            (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
+        if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
+            (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
 		return 0;
 
 	if (flags & RENAME_EXCHANGE) {
@@ -576,14 +576,14 @@ int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 int security_inode_readlink(struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_readlink(dentry);
 }
 
 int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_follow_link(dentry, nd);
 }
@@ -599,7 +599,7 @@ int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
 {
 	int ret;
 
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	ret = security_ops->inode_setattr(dentry, attr);
 	if (ret)
@@ -610,7 +610,7 @@ EXPORT_SYMBOL_GPL(security_inode_setattr);
 
 int security_inode_getattr(const struct path *path)
 {
-	if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
 		return 0;
 	return security_ops->inode_getattr(path);
 }
@@ -620,7 +620,7 @@ int security_inode_setxattr(struct dentry *dentry, const char *name,
 {
 	int ret;
 
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	ret = security_ops->inode_setxattr(dentry, name, value, size, flags);
 	if (ret)
@@ -634,7 +634,7 @@ int security_inode_setxattr(struct dentry *dentry, const char *name,
 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
 				  const void *value, size_t size, int flags)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return;
 	security_ops->inode_post_setxattr(dentry, name, value, size, flags);
 	evm_inode_post_setxattr(dentry, name, value, size);
@@ -642,14 +642,14 @@ void security_inode_post_setxattr(struct dentry *dentry, const char *name,
 
 int security_inode_getxattr(struct dentry *dentry, const char *name)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_getxattr(dentry, name);
 }
 
 int security_inode_listxattr(struct dentry *dentry)
 {
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	return security_ops->inode_listxattr(dentry);
 }
@@ -658,7 +658,7 @@ int security_inode_removexattr(struct dentry *dentry, const char *name)
 {
 	int ret;
 
-	if (unlikely(IS_PRIVATE(dentry->d_inode)))
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 	ret = security_ops->inode_removexattr(dentry, name);
 	if (ret)

security/selinux/hooks.c

@@ -414,7 +414,7 @@ static int sb_finish_set_opts(struct super_block *sb)
 {
 	struct superblock_security_struct *sbsec = sb->s_security;
 	struct dentry *root = sb->s_root;
-	struct inode *root_inode = root->d_inode;
+	struct inode *root_inode = d_backing_inode(root);
 	int rc = 0;
 
 	if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
@@ -552,7 +552,7 @@ static int selinux_get_mnt_opts(const struct super_block *sb,
 		opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
 	}
 	if (sbsec->flags & ROOTCONTEXT_MNT) {
-		struct inode *root = sbsec->sb->s_root->d_inode;
+		struct inode *root = d_backing_inode(sbsec->sb->s_root);
 		struct inode_security_struct *isec = root->i_security;
 
 		rc = security_sid_to_context(isec->sid, &context, &len);
@@ -608,7 +608,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	int rc = 0, i;
 	struct superblock_security_struct *sbsec = sb->s_security;
 	const char *name = sb->s_type->name;
-	struct inode *inode = sbsec->sb->s_root->d_inode;
+	struct inode *inode = d_backing_inode(sbsec->sb->s_root);
 	struct inode_security_struct *root_isec = inode->i_security;
 	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
 	u32 defcontext_sid = 0;
@@ -835,8 +835,8 @@ static int selinux_cmp_sb_context(const struct super_block *oldsb,
 	if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid)
 		goto mismatch;
 	if (oldflags & ROOTCONTEXT_MNT) {
-		struct inode_security_struct *oldroot = oldsb->s_root->d_inode->i_security;
-		struct inode_security_struct *newroot = newsb->s_root->d_inode->i_security;
+		struct inode_security_struct *oldroot = d_backing_inode(oldsb->s_root)->i_security;
+		struct inode_security_struct *newroot = d_backing_inode(newsb->s_root)->i_security;
 		if (oldroot->sid != newroot->sid)
 			goto mismatch;
 	}
@@ -886,16 +886,16 @@ static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
 		if (!set_fscontext)
 			newsbsec->sid = sid;
 		if (!set_rootcontext) {
-			struct inode *newinode = newsb->s_root->d_inode;
+			struct inode *newinode = d_backing_inode(newsb->s_root);
 			struct inode_security_struct *newisec = newinode->i_security;
 			newisec->sid = sid;
 		}
 		newsbsec->mntpoint_sid = sid;
 	}
 	if (set_rootcontext) {
-		const struct inode *oldinode = oldsb->s_root->d_inode;
+		const struct inode *oldinode = d_backing_inode(oldsb->s_root);
 		const struct inode_security_struct *oldisec = oldinode->i_security;
-		struct inode *newinode = newsb->s_root->d_inode;
+		struct inode *newinode = d_backing_inode(newsb->s_root);
 		struct inode_security_struct *newisec = newinode->i_security;
 
 		newisec->sid = oldisec->sid;
@@ -1610,7 +1610,7 @@ static inline int dentry_has_perm(const struct cred *cred,
 				  struct dentry *dentry,
 				  u32 av)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct common_audit_data ad;
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
@@ -1625,7 +1625,7 @@ static inline int path_has_perm(const struct cred *cred,
 				const struct path *path,
 				u32 av)
 {
-	struct inode *inode = path->dentry->d_inode;
+	struct inode *inode = d_backing_inode(path->dentry);
 	struct common_audit_data ad;
 
 	ad.type = LSM_AUDIT_DATA_PATH;
@@ -1753,7 +1753,7 @@ static int may_link(struct inode *dir,
 	int rc;
 
 	dsec = dir->i_security;
-	isec = dentry->d_inode->i_security;
+	isec = d_backing_inode(dentry)->i_security;
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
@@ -1797,7 +1797,7 @@ static inline int may_rename(struct inode *old_dir,
 	int rc;
 
 	old_dsec = old_dir->i_security;
-	old_isec = old_dentry->d_inode->i_security;
+	old_isec = d_backing_inode(old_dentry)->i_security;
 	old_is_dir = d_is_dir(old_dentry);
 	new_dsec = new_dir->i_security;
 
@@ -1827,7 +1827,7 @@ static inline int may_rename(struct inode *old_dir,
 	if (rc)
 		return rc;
 	if (d_is_positive(new_dentry)) {
-		new_isec = new_dentry->d_inode->i_security;
+		new_isec = d_backing_inode(new_dentry)->i_security;
 		new_is_dir = d_is_dir(new_dentry);
 		rc = avc_has_perm(sid, new_isec->sid,
 				  new_isec->sclass,
@@ -1963,7 +1963,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
 {
 	u32 sid = task_sid(to);
 	struct file_security_struct *fsec = file->f_security;
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct inode *inode = d_backing_inode(file->f_path.dentry);
 	struct inode_security_struct *isec = inode->i_security;
 	struct common_audit_data ad;
 	int rc;
@@ -2627,7 +2627,7 @@ static int selinux_sb_remount(struct super_block *sb, void *data)
 			break;
 		case ROOTCONTEXT_MNT: {
 			struct inode_security_struct *root_isec;
-			root_isec = sb->s_root->d_inode->i_security;
+			root_isec = d_backing_inode(sb->s_root)->i_security;
 
 			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
 				goto out_bad_option;
@@ -2727,7 +2727,7 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
 	struct task_security_struct *tsec;
 	struct inode_security_struct *dsec;
 	struct superblock_security_struct *sbsec;
-	struct inode *dir = dentry->d_parent->d_inode;
+	struct inode *dir = d_backing_inode(dentry->d_parent);
 	u32 newsid;
 	int rc;
 
@@ -2982,7 +2982,7 @@ static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
 static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
 				  const void *value, size_t size, int flags)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct inode_security_struct *isec = inode->i_security;
 	struct superblock_security_struct *sbsec;
 	struct common_audit_data ad;
@@ -3059,7 +3059,7 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
 					const void *value, size_t size,
 					int flags)
 {
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = d_backing_inode(dentry);
 	struct inode_security_struct *isec = inode->i_security;
 	u32 newsid;
 	int rc;

security/smack/smack_lsm.c

@@ -555,7 +555,7 @@ static int smack_sb_copy_data(char *orig, char *smackopts)
 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
 {
 	struct dentry *root = sb->s_root;
-	struct inode *inode = root->d_inode;
+	struct inode *inode = d_backing_inode(root);
 	struct superblock_smack *sp = sb->s_security;
 	struct inode_smack *isp;
 	struct smack_known *skp;
@@ -851,15 +851,15 @@ static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
 
-	isp = smk_of_inode(old_dentry->d_inode);
+	isp = smk_of_inode(d_backing_inode(old_dentry));
 	rc = smk_curacc(isp, MAY_WRITE, &ad);
-	rc = smk_bu_inode(old_dentry->d_inode, MAY_WRITE, rc);
+	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
 
 	if (rc == 0 && d_is_positive(new_dentry)) {
-		isp = smk_of_inode(new_dentry->d_inode);
+		isp = smk_of_inode(d_backing_inode(new_dentry));
 		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
 		rc = smk_curacc(isp, MAY_WRITE, &ad);
-		rc = smk_bu_inode(new_dentry->d_inode, MAY_WRITE, rc);
+		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
 	}
 
 	return rc;
@@ -875,7 +875,7 @@ static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
  */
 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
 {
-	struct inode *ip = dentry->d_inode;
+	struct inode *ip = d_backing_inode(dentry);
 	struct smk_audit_info ad;
 	int rc;
 
@@ -918,8 +918,8 @@ static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
 	/*
 	 * You need write access to the thing you're removing
 	 */
-	rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
-	rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
+	rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
+	rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
 	if (rc == 0) {
 		/*
 		 * You also need write access to the containing directory
@@ -957,15 +957,15 @@ static int smack_inode_rename(struct inode *old_inode,
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
 
-	isp = smk_of_inode(old_dentry->d_inode);
+	isp = smk_of_inode(d_backing_inode(old_dentry));
 	rc = smk_curacc(isp, MAY_READWRITE, &ad);
-	rc = smk_bu_inode(old_dentry->d_inode, MAY_READWRITE, rc);
+	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
 
 	if (rc == 0 && d_is_positive(new_dentry)) {
-		isp = smk_of_inode(new_dentry->d_inode);
+		isp = smk_of_inode(d_backing_inode(new_dentry));
 		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
 		rc = smk_curacc(isp, MAY_READWRITE, &ad);
-		rc = smk_bu_inode(new_dentry->d_inode, MAY_READWRITE, rc);
+		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
 	}
 	return rc;
 }
@@ -1022,8 +1022,8 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
-	rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
-	rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
+	rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
+	rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
 	return rc;
 }
 
@@ -1037,7 +1037,7 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 static int smack_inode_getattr(const struct path *path)
 {
 	struct smk_audit_info ad;
-	struct inode *inode = path->dentry->d_inode;
+	struct inode *inode = d_backing_inode(path->dentry);
 	int rc;
 
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
@@ -1104,8 +1104,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
 	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
 	if (rc == 0) {
-		rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
-		rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
+		rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
+		rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
 	}
 
 	return rc;
@@ -1126,7 +1126,7 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
 				      const void *value, size_t size, int flags)
 {
 	struct smack_known *skp;
-	struct inode_smack *isp = dentry->d_inode->i_security;
+	struct inode_smack *isp = d_backing_inode(dentry)->i_security;
 
 	if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
 		isp->smk_flags |= SMK_INODE_TRANSMUTE;
@@ -1171,8 +1171,8 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
-	rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
-	rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc);
+	rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
+	rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
 	return rc;
 }
 
@@ -1208,12 +1208,12 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
-	rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
-	rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
+	rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
+	rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
 	if (rc != 0)
 		return rc;
 
-	isp = dentry->d_inode->i_security;
+	isp = d_backing_inode(dentry)->i_security;
 	/*
 	 * Don't do anything special for these.
 	 *	XATTR_NAME_SMACKIPIN

security/tomoyo/condition.c

@@ -714,7 +714,7 @@ void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
 			dentry = dget_parent(dentry);
 			break;
 		}
-		inode = dentry->d_inode;
+		inode = d_backing_inode(dentry);
 		if (inode) {
 			struct tomoyo_mini_stat *stat = &obj->stat[i];
 			stat->uid  = inode->i_uid;

security/tomoyo/realpath.c

@@ -97,7 +97,7 @@ static char *tomoyo_get_absolute_path(const struct path *path, char * const buff
 		/* go to whatever namespace root we are under */
 		pos = d_absolute_path(path, buffer, buflen - 1);
 		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
-			struct inode *inode = path->dentry->d_inode;
+			struct inode *inode = d_backing_inode(path->dentry);
 			if (inode && S_ISDIR(inode->i_mode)) {
 				buffer[buflen - 2] = '/';
 				buffer[buflen - 1] = '\0';
@@ -125,7 +125,7 @@ static char *tomoyo_get_dentry_path(struct dentry *dentry, char * const buffer,
 	if (buflen >= 256) {
 		pos = dentry_path_raw(dentry, buffer, buflen - 1);
 		if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
-			struct inode *inode = dentry->d_inode;
+			struct inode *inode = d_backing_inode(dentry);
 			if (inode && S_ISDIR(inode->i_mode)) {
 				buffer[buflen - 2] = '/';
 				buffer[buflen - 1] = '\0';
@@ -168,7 +168,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
 	if (!MAJOR(sb->s_dev))
 		goto prepend_filesystem_name;
 	{
-		struct inode *inode = sb->s_root->d_inode;
+		struct inode *inode = d_backing_inode(sb->s_root);
 		/*
 		 * Use filesystem name if filesystem does not support rename()
 		 * operation.
@@ -219,7 +219,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
 static char *tomoyo_get_socket_name(const struct path *path, char * const buffer,
 				    const int buflen)
 {
-	struct inode *inode = path->dentry->d_inode;
+	struct inode *inode = d_backing_inode(path->dentry);
 	struct socket *sock = inode ? SOCKET_I(inode) : NULL;
 	struct sock *sk = sock ? sock->sk : NULL;
 	if (sk) {
@@ -277,7 +277,7 @@ char *tomoyo_realpath_from_path(const struct path *path)
 			pos = dentry->d_op->d_dname(dentry, buf, buf_len - 1);
 			goto encode;
 		}
-		inode = sb->s_root->d_inode;
+		inode = d_backing_inode(sb->s_root);
 		/*
 		 * Get local name for filesystems without rename() operation
 		 * or dentry without vfsmount.