Windows cares only about first 4 records in $MFTMirr and ignores

everything beyond them. Update libntfs behaviour to be like in
windows. Leave @mftmirr_size for case if will want to change something in the
future.

ChangeLog

@@ -69,6 +69,9 @@ xx/xx/2006 - x.xx.x - .
 	  NTFS_MNT_CASE_SENSITIVE.  (Yura)
 	- Treat filenames in POSIX namespace as case insensitive in case of
 	  case insensitive mounts.  (Anton, Yura)
+	- Windows cares only about first 4 records in $MFTMirr and ignores
+	  everything beyond them. Update libntfs behaviour to be like in
+	  windows.  (Yura)
 
 21/06/2006 - 1.13.1 - Various fixes.
 

libntfs/bootsect.c

@@ -261,16 +261,9 @@ int ntfs_boot_sector_parse(ntfs_volume *vol, const NTFS_BOOT_SECTOR *bs)
 			(unsigned)vol->indx_record_size);
 	ntfs_log_debug("INDXRecordSizeBits = %u\n", vol->indx_record_size_bits);
 	/*
-	 * Work out the size of the MFT mirror in number of mft records. If the
-	 * cluster size is less than or equal to the size taken by four mft
-	 * records, the mft mirror stores the first four mft records. If the
-	 * cluster size is bigger than the size taken by four mft records, the
-	 * mft mirror contains as many mft records as will fit into one
-	 * cluster.
+	 * Windows cares only about first 4 records in $MFTMirr and inores
+	 * everything beyend them.
 	 */
-	if (vol->cluster_size <= 4 * vol->mft_record_size)
-		vol->mftmirr_size = 4;
-	else
-		vol->mftmirr_size = vol->cluster_size / vol->mft_record_size;
+	vol->mftmirr_size = 4;
 	return 0;
 }

libntfs/mft.c

@@ -169,7 +169,7 @@ int ntfs_mft_records_write(const ntfs_volume *vol, const MFT_REF mref,
 		if (bw != -1)
 			errno = EIO;
 		if (bw >= 0)
-			ntfs_log_debug("Error: partial write while writing $Mft "
+			ntfs_log_error("Partial write while writing $Mft "
 					"record(s)!\n");
 		else
 			ntfs_log_perror("Error writing $Mft record(s)");

libntfs/volume.c

@@ -340,8 +340,7 @@ error_exit:
  */
 static int ntfs_mftmirr_load(ntfs_volume *vol)
 {
-	int i;
-	runlist_element rl[2];
+	int err;
 
 	vol->mftmirr_ni = ntfs_inode_open(vol, FILE_MFTMirr);
 	if (!vol->mftmirr_ni) {
@@ -359,36 +358,27 @@ static int ntfs_mftmirr_load(ntfs_volume *vol)
 		ntfs_log_perror("Failed to map runlist of $MFTMirr/$DATA");
 		goto error_exit;
 	}
-	/* Construct the mft mirror runlist. */
-	rl[0].vcn = 0;
-	rl[0].lcn = vol->mftmirr_lcn;
-	rl[0].length = (vol->mftmirr_size * vol->mft_record_size +
-			vol->cluster_size - 1) / vol->cluster_size;
-	rl[1].vcn = rl[0].length;
-	rl[1].lcn = LCN_ENOENT;
-	rl[1].length = 0;
-	/* Compare the two runlists. They must be identical. */
-	i = 0;
-	do {
-		if (rl[i].vcn != vol->mftmirr_na->rl[i].vcn ||
-				rl[i].lcn != vol->mftmirr_na->rl[i].lcn ||
-				rl[i].length != vol->mftmirr_na->rl[i].length) {
-			ntfs_log_debug("Error: $MFTMirr location mismatch! Run "
-					"chkdsk.\n");
-			errno = EIO;
-			goto error_exit;
-		}
-	} while (rl[i++].length);
+	/* Check $MFTMirr runlist. */
+	if (vol->mftmirr_na->rl[0].lcn != vol->mftmirr_lcn ||
+			vol->mftmirr_na->rl[0].length < (vol->mftmirr_size *
+			vol->mft_record_size + vol->cluster_size - 1) /
+			vol->cluster_size) {
+		ntfs_log_error("$MFTMirr location mismatch or first 4 records "
+				"are fragmented. Run chkdsk.\n");
+		errno = EIO;
+		goto error_exit;
+
+	}
 	return 0;
 error_exit:
-	i = errno;
+	err = errno;
 	if (vol->mftmirr_na) {
 		ntfs_attr_close(vol->mftmirr_na);
 		vol->mftmirr_na = NULL;
 	}
 	ntfs_inode_close(vol->mftmirr_ni);
 	vol->mftmirr_ni = NULL;
-	errno = i;
+	errno = err;
 	return -1;
 }