[v3,3/5] ceph: add ceph.snap.btime vxattr
diff mbox series

Message ID 20190418121549.30128-4-ddiss@suse.de
State New
Headers show
Series
  • ceph: add snapshot creation time vxattr
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Commit Message

David Disseldorp April 18, 2019, 12:15 p.m. UTC
The ceph.snap.btime virtual xattr provides the snapshot creation (birth)
time in $secs.$nsecs format.

Link: https://tracker.ceph.com/issues/38838
Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 fs/ceph/xattr.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

Patch
diff mbox series

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 2cbb9c239183..d637aba6fd2a 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -273,6 +273,19 @@  static size_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
 	return snprintf(val, size, "%llu", ci->i_max_files);
 }
 
+/* snapshots */
+static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
+{
+	return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
+}
+
+static size_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
+				       size_t size)
+{
+	return snprintf(val, size, "%lld.09%ld", ci->i_snap_btime.tv_sec,
+			ci->i_snap_btime.tv_nsec);
+}
+
 #define CEPH_XATTR_NAME(_type, _name)	XATTR_CEPH_PREFIX #_type "." #_name
 #define CEPH_XATTR_NAME2(_type, _name, _name2)	\
 	XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@@ -341,6 +354,13 @@  static struct ceph_vxattr ceph_dir_vxattrs[] = {
 	},
 	XATTR_QUOTA_FIELD(quota, max_bytes),
 	XATTR_QUOTA_FIELD(quota, max_files),
+	{
+		.name = "ceph.snap.btime",
+		.name_size = sizeof("ceph.snap.btime"),
+		.getxattr_cb = ceph_vxattrcb_snap_btime,
+		.exists_cb = ceph_vxattrcb_snap_btime_exists,
+		.flags = VXATTR_FLAG_READONLY,
+	},
 	{ .name = NULL, 0 }	/* Required table terminator */
 };
 static size_t ceph_dir_vxattrs_name_size;	/* total size of all names */
@@ -360,6 +380,13 @@  static struct ceph_vxattr ceph_file_vxattrs[] = {
 	XATTR_LAYOUT_FIELD(file, layout, object_size),
 	XATTR_LAYOUT_FIELD(file, layout, pool),
 	XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
+	{
+		.name = "ceph.snap.btime",
+		.name_size = sizeof("ceph.snap.btime"),
+		.getxattr_cb = ceph_vxattrcb_snap_btime,
+		.exists_cb = ceph_vxattrcb_snap_btime_exists,
+		.flags = VXATTR_FLAG_READONLY,
+	},
 	{ .name = NULL, 0 }	/* Required table terminator */
 };
 static size_t ceph_file_vxattrs_name_size;	/* total size of all names */