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committed 25985edcede RESTART_SPACE_FILLER = cpu_to_le16(0xffff), /* gcc: Force enum bit width to 16. *//* * logfile.h - Defines for NTFS kernel journal ($LogFile) handling. Part of * the Linux-NTFS project. * * Copyright (c) 2000-2005 Anton Altaparmakov * * This program/include file is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program/include file is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (in the main directory of the Linux-NTFS * distribution in the file COPYING); if not, write to the Free Software * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *//* * Journal ($LogFile) organization: * * Two restart areas present in the first two pages (restart pages, one restart * area in each page). When the volume is dismounted they should be identical, * except for the update sequence array which usually has a different update * sequence number. * * These are followed by log records organized in pages headed by a log record * header going up to log file size. Not all pages contain log records when a * volume is first formatted, but as the volume ages, all records will be used. * When the log file fills up, the records at the beginning are purged (by * modifying the oldest_lsn to a higher value presumably) and writing begins * at the beginning of the file. Effectively, the log file is viewed as a * circular entity. * * NOTE: Windows NT, 2000, and XP all use log file version 1.1 but they accept * versions <= 1.x, including 0.-1. (Yes, that is a minus one in there!) We * probably only want to support 1.1 as this seems to be the current version * and we don't know how that differs from the older versions. The only * exception is if the journal is clean as marked by the two restart pages * then it doesn't matter whether we are on an earlier version. We can just * reinitialize the logfile and start again with version 1.1. *//* Some $LogFile related constants. *//* * Log file restart page header (begins the restart area). */typedef struct {/*Ofs*//* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. *//* 0*/ NTFS_RECORD_TYPE magic; /* The magic is "RSTR". *//* 4*/ le16 usa_ofs; /* See NTFS_RECORD definition in layout.h. When creating, set this to be immediately after this header structure (without any alignment). *//* 6*/ le16 usa_count; /* See NTFS_RECORD definition in layout.h. *//* 8*/ leLSN chkdsk_lsn; /* The last log file sequence number found by chkdsk. Only used when the magic is changed to "CHKD". Otherwise this is zero. *//* 16*/ le32 system_page_size; /* Byte size of system pages when the log file was created, has to be >= 512 and a power of 2. Use this to calculate the required size of the usa (usa_count) and add it to usa_ofs. Then verify that the result is less than the value of the restart_area_offset. *//* 20*/ le32 log_page_size; /* Byte size of log file pages, has to be >= 512 and a power of 2. The default is 4096 and is used when the system page size is between 4096 and 8192. Otherwise this is set to the system page size instead. *//* 24*/ le16 restart_area_offset;/* Byte offset from the start of this header to the RESTART_AREA. Value has to be aligned