Add a new vxattr that allows userspace to list the caps for a specific
directory or file.
Signed-off-by: Luis Henriques <lhenriques@xxxxxxx>
---
Hi!
Here's a version that also shows the caps in hexadecimal format, as
suggested by Jeff. IMO the parenthesis and the '0x' prefix help the
readability, but they may make it a bit harder for scripts to parsing the
output. I'm OK dropping those.
Cheers,
--
Luis
fs/ceph/xattr.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 197cb1234341..aec9bd5c8e77 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -303,6 +303,19 @@ static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
ci->i_snap_btime.tv_nsec);
}
+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
@@ -378,6 +391,13 @@ 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 */
};
@@ -403,6 +423,13 @@ 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 */
};
