[XFS] Track external log/realtime device names for correct reporting in

/proc/mounts.

SGI-PV: 942984
SGI-Modid: xfs-linux:xfs-kern:23862a
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/xfs_log.c

@@ -483,7 +483,8 @@ xfs_log_mount(xfs_mount_t	*mp,
 
 #if defined(DEBUG) || defined(XLOG_NOLOG)
 	if (!xlog_debug) {
-		cmn_err(CE_NOTE, "log dev: %s", XFS_BUFTARG_NAME(log_target));
+		cmn_err(CE_NOTE, "logdev: %s", mp->m_logname ?
+			mp->m_logname : "internal");
 		return 0;
 	}
 #endif

fs/xfs/xfs_log_recover.c

@@ -2226,8 +2226,9 @@ xlog_recover_do_buffer_trans(
 		break;
 	default:
 		xfs_fs_cmn_err(CE_ALERT, log->l_mp,
-			"xfs_log_recover: unknown buffer type 0x%x, dev %s",
-			buf_f->blf_type, XFS_BUFTARG_NAME(log->l_targ));
+			"xfs_log_recover: unknown buffer type 0x%x, logdev %s",
+			buf_f->blf_type, log->l_mp->m_logname ?
+			log->l_mp->m_logname : "internal");
 		XFS_ERROR_REPORT("xlog_recover_do_buffer_trans",
 				 XFS_ERRLEVEL_LOW, log->l_mp);
 		return XFS_ERROR(EFSCORRUPTED);
@@ -3938,8 +3939,9 @@ xlog_recover(
 		}
 
 		cmn_err(CE_NOTE,
-			"Starting XFS recovery on filesystem: %s (dev: %s)",
-			log->l_mp->m_fsname, XFS_BUFTARG_NAME(log->l_targ));
+			"Starting XFS recovery on filesystem: %s (logdev: %s)",
+			log->l_mp->m_fsname, log->l_mp->m_logname ?
+			log->l_mp->m_logname : "internal");
 
 		error = xlog_do_recover(log, head_blk, tail_blk);
 		log->l_flags |= XLOG_RECOVERY_NEEDED;
@@ -3987,8 +3989,9 @@ xlog_recover_finish(
 		xlog_recover_check_summary(log);
 
 		cmn_err(CE_NOTE,
-			"Ending XFS recovery on filesystem: %s (dev: %s)",
-			log->l_mp->m_fsname, XFS_BUFTARG_NAME(log->l_targ));
+			"Ending XFS recovery on filesystem: %s (logdev: %s)",
+			log->l_mp->m_fsname, log->l_mp->m_logname ?
+			log->l_mp->m_logname : "internal");
 		log->l_flags &= ~XLOG_RECOVERY_NEEDED;
 	} else {
 		cmn_err(CE_DEBUG,

fs/xfs/xfs_mount.c

@@ -180,6 +180,10 @@ xfs_mount_free(
 
 	if (mp->m_fsname != NULL)
 		kmem_free(mp->m_fsname, mp->m_fsname_len);
+	if (mp->m_rtname != NULL)
+		kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
+	if (mp->m_logname != NULL)
+		kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
 
 	if (remove_bhv) {
 		struct vfs	*vfsp = XFS_MTOVFS(mp);

fs/xfs/xfs_mount.h

@@ -292,6 +292,8 @@ typedef struct xfs_mount {
 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
 	char			*m_fsname;	/* filesystem name */
 	int			m_fsname_len;	/* strlen of fs name */
+	char			*m_rtname;	/* realtime device name */
+	char			*m_logname;	/* external log device name */
 	int			m_bsize;	/* fs logical block size */
 	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
 	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */

fs/xfs/xfs_vfsops.c

@@ -257,6 +257,14 @@ xfs_start_flags(
 	mp->m_fsname_len = strlen(ap->fsname) + 1;
 	mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
 	strcpy(mp->m_fsname, ap->fsname);
+	if (ap->rtname[0]) {
+		mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
+		strcpy(mp->m_rtname, ap->rtname);
+	}
+	if (ap->logname[0]) {
+		mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
+		strcpy(mp->m_logname, ap->logname);
+	}
 
 	if (ap->flags & XFSMNT_WSYNC)
 		mp->m_flags |= XFS_MOUNT_WSYNC;
@@ -1914,13 +1922,11 @@ xfs_showargs(
 	if (mp->m_logbsize > 0)
 		seq_printf(m, "," MNTOPT_LOGBSIZE "=%d", mp->m_logbsize);
 
-	if (mp->m_ddev_targp != mp->m_logdev_targp)
-		seq_printf(m, "," MNTOPT_LOGDEV "=%s",
-				XFS_BUFTARG_NAME(mp->m_logdev_targp));
+	if (mp->m_logname)
+		seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
 
-	if (mp->m_rtdev_targp && mp->m_ddev_targp != mp->m_rtdev_targp)
-		seq_printf(m, "," MNTOPT_RTDEV "=%s",
-				XFS_BUFTARG_NAME(mp->m_rtdev_targp));
+	if (mp->m_rtname)
+		seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
 
 	if (mp->m_dalign > 0)
 		seq_printf(m, "," MNTOPT_SUNIT "=%d",