ceph: fix setting empty extended attribute
make sure 'value' is not null. otherwise __ceph_setxattr will remove
the extended attribute.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 678b0d2..5a492ca 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -854,7 +854,7 @@
struct ceph_pagelist *pagelist = NULL;
int err;
- if (value) {
+ if (size > 0) {
/* copy value into pagelist */
pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
if (!pagelist)
@@ -864,7 +864,7 @@
err = ceph_pagelist_append(pagelist, value, size);
if (err)
goto out;
- } else {
+ } else if (!value) {
flags |= CEPH_XATTR_REMOVE;
}
@@ -1001,6 +1001,9 @@
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_setxattr(dentry, name, value, size, flags);
+ if (size == 0)
+ value = ""; /* empty EA, do not remove */
+
return __ceph_setxattr(dentry, name, value, size, flags);
}