Btrfs: Implement ACLs setting and getting

ACLs are stored but not used for permission checks (yet)

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 44 insertions, 29 deletions

diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 889ba89d3f9f..b4f85ebe1bd6 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -22,53 +22,68 @@
 #include <linux/posix_acl_xattr.h>
 #include "ctree.h"
 #include "xattr.h"
+static int btrfs_xattr_set_acl(struct inode *inode, int type,
+			       const void *value, size_t size)
+{
+	int ret = 0;
+	struct posix_acl *acl;
 
-/*
- * FIXME: At this point this is all place holder stuff, we just return
- * -EOPNOTSUPP so cp won't complain when it tries to copy over a file with an
- *  acl on it.
- */
+	if (!is_owner_or_cap(inode))
+		return -EPERM;
+	if (value) {
+		acl = posix_acl_from_xattr(value, size);
+		if (acl == NULL) {
+			value = NULL;
+			size = 0;
+		} else if (IS_ERR(acl)) {
+			ret = PTR_ERR(acl);
+		} else {
+			ret = posix_acl_valid(acl);
+			posix_acl_release(acl);
+		}
+		if (ret)
+			return ret;
+	}
+	return btrfs_xattr_set(inode, type, "", value, size, 0);
+}
 
+static int btrfs_xattr_get_acl(struct inode *inode, int type,
+			       void *value, size_t size)
+{
+	return btrfs_xattr_get(inode, type, "", value, size);
+}
 static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,
 				      void *value, size_t size)
 {
-	/*
-	return btrfs_xattr_get(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS, name,
-			       value, size);
-	*/
-	return -EOPNOTSUPP;
+	if (*name != '\0')
+	       return -EINVAL;
+	return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
+				   value, size);
 }
-
 static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,
 				      const void *value, size_t size, int flags)
 {
-	/*
-	return btrfs_xattr_set(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS, name,
-			       value, size, flags);
-	*/
-	return -EOPNOTSUPP;
+	if (*name != '\0')
+	       return -EINVAL;
+	return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
+				   value, size);
 }
-
 static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,
 				       void *value, size_t size)
 {
-	/*
-	return btrfs_xattr_get(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
-			       name, value, size);
-	*/
-	return -EOPNOTSUPP;
+	if (*name != '\0')
+	       return -EINVAL;
+	return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
+				   value, size);
 }
-
 static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,
 				       const void *value, size_t size, int flags)
 {
-	/*
-	return btrfs_xattr_set(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
-			       name, value, size, flags);
-	*/
-	return -EOPNOTSUPP;
+	if (*name != '\0')
+	       return -EINVAL;
+	return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
+				   value, size);
 }
-
 struct xattr_handler btrfs_xattr_acl_default_handler = {
 	.prefix = POSIX_ACL_XATTR_DEFAULT,
 	.list	= btrfs_xattr_generic_list,