[PATCH v20 20/23] richacl: Add richacl xattr handler

From	Andreas Gruenbacher <agruenba@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH v20 20/23] richacl: Add richacl xattr handler
Date	2016-03-16 23:30 +0100
Message-ID	<rds72-6Wr-59@gated-at.bofh.it> (permalink)
References	<rdrXj-6Sv-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Add richacl xattr handler implementing the xattr operations based on the
get_richacl and set_richacl inode operations.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/richacl_xattr.c            | 74 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/richacl_xattr.h |  2 ++
 2 files changed, 76 insertions(+)

diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
index dc1ad36..5cb5e11 100644
--- a/fs/richacl_xattr.c
+++ b/fs/richacl_xattr.c
@@ -18,7 +18,9 @@
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/xattr.h>
 #include <linux/richacl_xattr.h>
+#include <uapi/linux/xattr.h>
 
 /**
  * richacl_from_xattr  -  convert a richacl xattr into the in-memory representation
@@ -159,3 +161,75 @@ richacl_to_xattr(struct user_namespace *user_ns,
 	return real_size;
 }
 EXPORT_SYMBOL_GPL(richacl_to_xattr);
+
+static bool
+richacl_xattr_list(struct dentry *dentry)
+{
+	return IS_RICHACL(d_backing_inode(dentry));
+}
+
+static int
+richacl_xattr_get(const struct xattr_handler *handler,
+		  struct dentry *dentry, const char *name, void *buffer,
+		  size_t buffer_size)
+{
+	struct inode *inode = d_backing_inode(dentry);
+	struct richacl *acl;
+	int error;
+
+	if (*name)
+		return -EINVAL;
+	if (!IS_RICHACL(inode))
+		return -EOPNOTSUPP;
+	if (S_ISLNK(inode->i_mode))
+		return -EOPNOTSUPP;
+	acl = get_richacl(inode);
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+	if (acl == NULL)
+		return -ENODATA;
+	error = richacl_to_xattr(current_user_ns(), acl, buffer, buffer_size);
+	richacl_put(acl);
+	return error;
+}
+
+static int
+richacl_xattr_set(const struct xattr_handler *handler,
+		  struct dentry *dentry, const char *name,
+		  const void *value, size_t size, int flags)
+{
+	struct inode *inode = d_backing_inode(dentry);
+	struct richacl *acl = NULL;
+	int ret;
+
+	if (*name)
+		return -EINVAL;
+	if (!IS_RICHACL(inode))
+		return -EOPNOTSUPP;
+	if (!inode->i_op->set_richacl)
+		return -EOPNOTSUPP;
+
+	if (!uid_eq(current_fsuid(), inode->i_uid) &&
+	    inode_permission(inode, MAY_CHMOD) &&
+	    !capable(CAP_FOWNER))
+		return -EPERM;
+
+	if (value) {
+		acl = richacl_from_xattr(current_user_ns(), value, size,
+					 -EINVAL);
+		if (IS_ERR(acl))
+			return PTR_ERR(acl);
+	}
+
+	ret = inode->i_op->set_richacl(inode, acl);
+	richacl_put(acl);
+	return ret;
+}
+
+struct xattr_handler richacl_xattr_handler = {
+	.name = XATTR_NAME_RICHACL,
+	.list = richacl_xattr_list,
+	.get = richacl_xattr_get,
+	.set = richacl_xattr_set,
+};
+EXPORT_SYMBOL(richacl_xattr_handler);
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
index 0efa14b..6c6adb1 100644
--- a/include/linux/richacl_xattr.h
+++ b/include/linux/richacl_xattr.h
@@ -26,4 +26,6 @@ extern size_t richacl_xattr_size(const struct richacl *);
 extern int richacl_to_xattr(struct user_namespace *, const struct richacl *,
 			    void *, size_t);
 
+extern struct xattr_handler richacl_xattr_handler;
+
 #endif /* __RICHACL_XATTR_H */
-- 
2.5.0

Thread

[PATCH v20 00/23] Richacls (Core and Ext4) Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:20 +0100
  [PATCH v20 03/23] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:20 +0100
  [PATCH v20 01/23] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:20 +0100
  [PATCH v20 11/23] posix_acl: Improve xattr fixup code Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 13/23] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 05/23] vfs: Add permission flags for setting file attributes Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 09/23] richacl: Permission check algorithm Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 14/23] vfs: Cache richacl in struct inode Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 23/23] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 10/23] posix_acl: Unexport acl_by_type and make it static Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 04/23] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 02/23] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 22/23] ext4: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 08/23] richacl: Compute maximum file masks from an acl Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 16/23] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 19/23] richacl: xattr mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 06/23] richacl: In-memory representation and helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 21/23] vfs: Add richacl permission checking Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 07/23] richacl: Permission mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 12/23] vfs: Cache base_acl objects in inodes Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 20/23] richacl: Add richacl xattr handler Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 18/23] richacl: Automatic Inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 15/23] richacl: Update the file masks in chmod() Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100
  [PATCH v20 17/23] richacl: Create-time inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2016-03-16 23:30 +0100

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