ceph: add ceph.caps vxattr
Add a new vxattr that allows userspace to list the caps for a specific
directory or file.
[ jlayton: change format delimiter to '/' ]
Signed-off-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index e89750a..cd8c7aa 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -321,6 +321,19 @@ static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
ceph_client_gid(fsc->client));
}
+static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
+ size_t size)
+{
+ int issued;
+
+ spin_lock(&ci->i_ceph_lock);
+ issued = __ceph_caps_issued(ci, NULL);
+ spin_unlock(&ci->i_ceph_lock);
+
+ return ceph_fmt_xattr(val, size, "%s/0x%x",
+ ceph_cap_string(issued), issued);
+}
+
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define CEPH_XATTR_NAME2(_type, _name, _name2) \
XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@@ -396,6 +409,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
+ {
+ .name = "ceph.caps",
+ .name_size = sizeof("ceph.caps"),
+ .getxattr_cb = ceph_vxattrcb_caps,
+ .exists_cb = NULL,
+ .flags = VXATTR_FLAG_HIDDEN,
+ },
{ .name = NULL, 0 } /* Required table terminator */
};
@@ -421,6 +441,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = {
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
+ {
+ .name = "ceph.caps",
+ .name_size = sizeof("ceph.caps"),
+ .getxattr_cb = ceph_vxattrcb_caps,
+ .exists_cb = NULL,
+ .flags = VXATTR_FLAG_HIDDEN,
+ },
{ .name = NULL, 0 } /* Required table terminator */
};
