[-V5,19/24] richacl: Automatic Inheritance

Commit Message

Aneesh Kumar K.V Feb. 23, 2011, 1:52 p.m. UTC

None

Patch

diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index e60440b..c064c90 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -377,7 +377,8 @@  richacl_chmod(struct richacl *acl, mode_t mode)
 	if (acl->a_owner_mask == owner_mask &&
 	    acl->a_group_mask == group_mask &&
 	    acl->a_other_mask == other_mask &&
-	    (acl->a_flags & ACL4_MASKED))
+	    (acl->a_flags & ACL4_MASKED) &&
+	    (!richacl_is_auto_inherit(acl) || richacl_is_protected(acl)))
 		return acl;
 
 	clone = richacl_clone(acl);
@@ -389,6 +390,8 @@  richacl_chmod(struct richacl *acl, mode_t mode)
 	clone->a_owner_mask = owner_mask;
 	clone->a_group_mask = group_mask;
 	clone->a_other_mask = other_mask;
+	if (richacl_is_auto_inherit(clone))
+		clone->a_flags |= ACL4_PROTECTED;
 
 	return clone;
 }
@@ -558,6 +561,11 @@  richacl_inherit(const struct richacl *dir_acl, int isdir)
 			ace++;
 		}
 	}
+	if (richacl_is_auto_inherit(dir_acl)) {
+		acl->a_flags = ACL4_AUTO_INHERIT;
+		richacl_for_each_entry(ace, acl)
+			ace->e_flags |= ACE4_INHERITED_ACE;
+	}
 
 	return acl;
 }
diff --git a/fs/richacl_inode.c b/fs/richacl_inode.c
index 31e6925..5ae6326 100644
--- a/fs/richacl_inode.c
+++ b/fs/richacl_inode.c
@@ -37,9 +37,14 @@  richacl_inherit_inode(const struct richacl *dir_acl, struct inode *inode)
 
 	acl = richacl_inherit(dir_acl, S_ISDIR(inode->i_mode));
 	if (acl) {
+		/*
+		 * We need to set ACL4_PROTECTED because we are
+		 * doing an implicit chmod
+		 */
+		if (richacl_is_auto_inherit(acl))
+			acl->a_flags |= ACL4_PROTECTED;
 
 		richacl_compute_max_masks(acl);
-
 		/*
 		 * Ensure that the acl will not grant any permissions beyond
 		 * the create mode.
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 12a79f1..23befbc 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -47,10 +47,16 @@  struct richacl {
 	     _ace != _acl->a_entries - 1; \
 	     _ace--)
 
+/* a_flags values */
+#define ACL4_AUTO_INHERIT		0x01
+#define ACL4_PROTECTED			0x02
+/* #define ACL4_DEFAULTED			0x04 */
 /* Flag values defined by rich-acl */
 #define ACL4_MASKED			0x80
 
 #define ACL4_VALID_FLAGS (			\
+		ACL4_AUTO_INHERIT |		\
+		ACL4_PROTECTED |		\
 		ACL4_MASKED)
 
 /* e_type values */
@@ -67,6 +73,7 @@  struct richacl {
 /*#define ACE4_SUCCESSFUL_ACCESS_ACE_FLAG	0x0010*/
 /*#define ACE4_FAILED_ACCESS_ACE_FLAG	0x0020*/
 #define ACE4_IDENTIFIER_GROUP		0x0040
+#define ACE4_INHERITED_ACE		0x0080
 /* in-memory representation only */
 #define ACE4_SPECIAL_WHO		0x4000
 
@@ -75,7 +82,8 @@  struct richacl {
 	ACE4_DIRECTORY_INHERIT_ACE |		\
 	ACE4_NO_PROPAGATE_INHERIT_ACE |		\
 	ACE4_INHERIT_ONLY_ACE |			\
-	ACE4_IDENTIFIER_GROUP)
+	ACE4_IDENTIFIER_GROUP |			\
+	ACE4_INHERITED_ACE)
 
 /* e_mask bitflags */
 #define ACE4_READ_DATA			0x00000001
@@ -181,6 +189,18 @@  richacl_put(struct richacl *acl)
 		kfree(acl);
 }
 
+static inline int
+richacl_is_auto_inherit(const struct richacl *acl)
+{
+	return acl->a_flags & ACL4_AUTO_INHERIT;
+}
+
+static inline int
+richacl_is_protected(const struct richacl *acl)
+{
+	return acl->a_flags & ACL4_PROTECTED;
+}
+
 /*
  * Special e_who identifiers: we use these pointer values in comparisons
  * instead of doing a strcmp.
@@ -259,7 +279,8 @@  richace_clear_inheritance_flags(struct richace *ace)
 	ace->e_flags &= ~(ACE4_FILE_INHERIT_ACE |
 			  ACE4_DIRECTORY_INHERIT_ACE |
 			  ACE4_NO_PROPAGATE_INHERIT_ACE |
-			  ACE4_INHERIT_ONLY_ACE);
+			  ACE4_INHERIT_ONLY_ACE |
+			  ACE4_INHERITED_ACE);
 }
 
 /**