[PATCH v11 18/48] richacl: Add richacl xattr handler

[Andreas Gruenbacher]

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

Signed-off-by: Andreas Gruenbacher <agrue...@redhat.com>
---
 fs/richacl_xattr.c            | 78 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/richacl_xattr.h |  2 ++
 2 files changed, 80 insertions(+)

diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
index cd9979d..dc529dc 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>
 
 MODULE_LICENSE("GPL");
 
@@ -161,6 +163,82 @@ richacl_to_xattr(struct user_namespace *user_ns,
 }
 EXPORT_SYMBOL_GPL(richacl_to_xattr);
 
+static size_t
+richacl_xattr_list(struct dentry *dentry, char *list, size_t list_len,
+                  const char *name, size_t name_len, int handler_flags)
+{
+       const size_t size = sizeof(XATTR_NAME_RICHACL);
+
+       if (!IS_RICHACL(d_backing_inode(dentry)))
+               return 0;
+       if (list && size <= list_len)
+               memcpy(list, XATTR_NAME_RICHACL, size);
+       return size;
+}
+
+static int
+richacl_xattr_get(struct dentry *dentry, const char *name, void *buffer,
+                 size_t buffer_size, int handler_flags)
+{
+       struct inode *inode = d_backing_inode(dentry);
+       struct richacl *acl;
+       int error;
+
+       if (strcmp(name, "") != 0)
+               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(&init_user_ns, acl, buffer, buffer_size);
+       richacl_put(acl);
+       return error;
+}
+
+static int
+richacl_xattr_set(struct dentry *dentry, const char *name,
+                 const void *value, size_t size, int flags, int handler_flags)
+{
+       struct inode *inode = d_backing_inode(dentry);
+       struct richacl *acl = NULL;
+       int ret;
+
+       if (strcmp(name, "") != 0)
+               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(&init_user_ns, value, size);
+               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 = {
+       .prefix = XATTR_NAME_RICHACL,
+       .list = richacl_xattr_list,
+       .get = richacl_xattr_get,
+       .set = richacl_xattr_set,
+};
+EXPORT_SYMBOL(richacl_xattr_handler);
+
 /*
  * Fix up the uids and gids in richacl extended attributes in place.
  */
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
index a088a1d..ce19b6f 100644
--- a/include/linux/richacl_xattr.h
+++ b/include/linux/richacl_xattr.h
@@ -39,4 +39,6 @@ static inline void richacl_fix_xattr_to_user(void *value, 
size_t size)
 }
 #endif
 
+extern struct xattr_handler richacl_xattr_handler;
+
 #endif /* __RICHACL_XATTR_H */
-- 
2.5.0

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