From: Jeremy Allison <jra@samba.org>
Date: Wed, 23 Jun 2021 17:58:40 +0000 (-0700)
Subject: s3: VFS: ceph_snapshots: Add ceph_snap_get_btime_fsp().
X-Git-Tag: tevent-0.11.0~182
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe9575c88f048ac760a33fd5f65c18e8f2714e70;p=thirdparty%2Fsamba.git

s3: VFS: ceph_snapshots: Add ceph_snap_get_btime_fsp().

Handle-based copy of ceph_snap_get_btime(). Uses
SMB_VFS_NEXT_FGETXATTR() instead of SMB_VFS_NEXT_GETXATTR().

Commented out as nothing uses it yet. This will change shortly.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
---

diff --git a/source3/modules/vfs_ceph_snapshots.c b/source3/modules/vfs_ceph_snapshots.c
index be9b2dd1aa6..1b5322475dd 100644
--- a/source3/modules/vfs_ceph_snapshots.c
+++ b/source3/modules/vfs_ceph_snapshots.c
@@ -113,6 +113,76 @@ static int ceph_snap_get_btime(struct vfs_handle_struct *handle,
 	return 0;
 }
 
+#if 0
+static int ceph_snap_get_btime_fsp(struct vfs_handle_struct *handle,
+				   struct files_struct *fsp,
+				   time_t *_snap_secs)
+{
+	int ret;
+	char snap_btime[33];
+	char *s = NULL;
+	char *endptr = NULL;
+	struct timespec snap_timespec;
+	int err;
+
+	ret = SMB_VFS_NEXT_FGETXATTR(handle,
+				    fsp,
+				    CEPH_SNAP_BTIME_XATTR,
+				    snap_btime,
+				    sizeof(snap_btime));
+	if (ret < 0) {
+		DBG_ERR("failed to get %s xattr: %s\n",
+			CEPH_SNAP_BTIME_XATTR, strerror(errno));
+		return -errno;
+	}
+
+	if (ret == 0 || ret >= sizeof(snap_btime) - 1) {
+		return -EINVAL;
+	}
+
+	/* ensure zero termination */
+	snap_btime[ret] = '\0';
+
+	/* format is sec.nsec */
+	s = strchr(snap_btime, '.');
+	if (s == NULL) {
+		DBG_ERR("invalid %s xattr value: %s\n",
+			CEPH_SNAP_BTIME_XATTR, snap_btime);
+		return -EINVAL;
+	}
+
+	/* First component is seconds, extract it */
+	*s = '\0';
+	snap_timespec.tv_sec = smb_strtoull(snap_btime,
+					    &endptr,
+					    10,
+					    &err,
+					    SMB_STR_FULL_STR_CONV);
+	if (err != 0) {
+		return -err;
+	}
+
+	/* second component is nsecs */
+	s++;
+	snap_timespec.tv_nsec = smb_strtoul(s,
+					    &endptr,
+					    10,
+					    &err,
+					    SMB_STR_FULL_STR_CONV);
+	if (err != 0) {
+		return -err;
+	}
+
+	/*
+	 * >> 30 is a rough divide by ~10**9. No need to be exact, as @GMT
+	 * tokens only offer 1-second resolution (while twrp is nsec).
+	 */
+	*_snap_secs = snap_timespec.tv_sec + (snap_timespec.tv_nsec >> 30);
+
+	return 0;
+}
+#endif
+
 /*
  * XXX Ceph snapshots can be created with sub-second granularity, which means
  * that multiple snapshots may be mapped to the same @GMT- label.