如何修复linux系统文件
昨天天运行了一个程序，然后出错，重启，文件就都变成只读的了;
删除文件时，提示：
rm: cannot remove `plast3.dat': Input/output error
dmesg的显示：
Mount JFS Failure: -22
XFS mounting filesystem hda1
Starting XFS recovery on filesystem: hda1 (logdev: internal)
XFS internal error XFS_WANT_CORRUPTED_GOTO at line 1617 of file fs/xfs/xfs_a
lloc.c. Caller 0xc021318f
[<c0212a25>] xfs_free_ag_extent+0x54c/0x7c7
[<c021318f>] xfs_free_extent+0xa7/0xc3
[<c021318f>] xfs_free_extent+0xa7/0xc3
[<c0251ef9>] xlog_recover_finish+0x200/0x37b
[<c0257bf4>] xfs_mountfs+0xff8/0x115b
[<c0110418>] default_wake_function+0x0/0x15
[<c044fe2f>] __down_failed+0x7/0xc
[<c027e68a>] generic_unplug_device+0x0/0x68
[<c025f3cd>] xfs_mount+0x937/0xa08
[<c020970d>] xfs_qm_parseargs+0x266/0x270
[<c02718a3>] xfs_fs_fill_super+0x91/0x22e
[<c028a173>] snprintf+0x2b/0x2f
[<c018f8ec>] disk_name+0x84/0x8e
[<c017e7f9>] sb_set_blocksize+0x1e/0x42
[<c015bb68>] get_sb_bdev+0xfa/0x152
[<c013f3b5>] __alloc_pages+0x54/0x2a7
[<c0156219>] __kmalloc+0x74/0x7e
[<c0270f73>] xfs_fs_get_sb+0x37/0x3b
[<c0271812>] xfs_fs_fill_super+0x0/0x22e
[<c015aee5>] vfs_kern_mount+0x49/0x7c
[<c015af7d>] do_kern_mount+0x3c/0x4e
[<c01706e8>] do_mount+0x6b3/0x70c
[<c0161a4e>] do_lookup+0x59/0x16b
[<c016a147>] dput+0x22/0x1f0
[<c013f1ef>] get_page_from_freelist+0x255/0x3c7
[<c016ee75>] mntput_no_expire+0x1b/0xd4
[<c013f1ef>] get_page_from_freelist+0x255/0x3c7
[<c0110418>] default_wake_function+0x0/0x15
[<c044fe2f>] __down_failed+0x7/0xc
[<c027e68a>] generic_unplug_device+0x0/0x68
[<c025f3cd>] xfs_mount+0x937/0xa08
[<c020970d>] xfs_qm_parseargs+0x266/0x270
[<c02718a3>] xfs_fs_fill_super+0x91/0x22e
[<c028a173>] snprintf+0x2b/0x2f
[<c018f8ec>] disk_name+0x84/0x8e
[<c017e7f9>] sb_set_blocksize+0x1e/0x42
[<c015bb68>] get_sb_bdev+0xfa/0x152
[<c013f3b5>] __alloc_pages+0x54/0x2a7
[<c0156219>] __kmalloc+0x74/0x7e
[<c0270f73>] xfs_fs_get_sb+0x37/0x3b
[<c0271812>] xfs_fs_fill_super+0x0/0x22e
[<c015aee5>] vfs_kern_mount+0x49/0x7c
[<c015af7d>] do_kern_mount+0x3c/0x4e
[<c01706e8>] do_mount+0x6b3/0x70c
[<c0161a4e>] do_lookup+0x59/0x16b
[<c016a147>] dput+0x22/0x1f0
[<c013f1ef>] get_page_from_freelist+0x255/0x3c7
[<c016ee75>] mntput_no_expire+0x1b/0xd4
[<c013f1ef>] get_page_from_freelist+0x255/0x3c7
[<c01560e2>] cache_alloc_refill+0x438/0x4fb
[<c013f3b5>] __alloc_pages+0x54/0x2a7
[<c013fa95>] __get_free_pages+0x1a/0x33
[<c016ed7b>] copy_mount_options+0x27/0x106
[<c01707de>] sys_mount+0x9d/0xde
[<c055a960>] mount_block_root+0xd1/0x22a
[<c0163fa5>] sys_mknod+0x27/0x2b
[<c055ab36>] mount_root+0x7d/0x82
[<c055ac0b>] prepare_namespace+0xd0/0x10e
[<c015816c>] sys_access+0x1f/0x23
[<c01004f0>] init+0x17f/0x253
[<c0102b07>] ret_from_fork+0x7/0x1c
[<c0102cb3>] restore_nocheck_notrace+0x0/0xd
[<c0100371>] init+0x0/0x253
[<c0100371>] init+0x0/0x253
[<c0102f1f>] kernel_thread_helper+0x7/0x10
=======================
Ending XFS recovery on filesystem: hda1 (logdev: internal)
VFS: Mounted root (xfs filesystem) readonly.
解决方法：
1. 首先刻一张lfs的livecd并插入lfs的livecd到电脑或者另外找一个host。
2. 找一张读卡器，取出pc104的cf卡，插上并接入到host。
注意：如果用的是虚拟机，那么等虚拟机重启了，再把cf卡通过usb读卡器插进电脑，另外我们的情况，cf卡的设备号是/dev/sda1
3. 通过
mkdir /mnt/directory
mount –t [type] /dev/device /mnt/directory
然后ls /mnt/directory确认里面的内容是不是cf卡上的内容
最后umount /mnt/directory
4. 先用fsck –t xfs –a /dev/device 修复，但是发现不行。
5. 接着用xfs_check –n /dev/device检查，发现还是不行，最后用xfs_repair /dev/device修复，成功。
有些机子不一定有xfs_repair，可以安装一个xfsprogs
ftp://oss.sgi.com/projects/xfs/download/cmd_tars/xfsprogs_2.8.18-1.tar.gz
安装方法，参考http://www.linuxfromscratch.org/blfs/view/6.2.0/postlfs/xfsfs.html
tar xvf xfsprogs_2.8.18-1.tar.gz
cd xfsprogs-2.8.18
先安装xfs：
sed -i '/autoconf/d' Makefile &&
make DEBUG=-DNDEBUG INSTALL_USER=root INSTALL_GROUP=root \
LOCAL_CONFIGURE_OPTIONS="--enable-readline=yes"
然后
make install &&make install-dev &&install -v -m755 -D libhandle/libhandle.la /usr/lib/libhandle.la &&chmod -v 755 /lib/libhandle.so* &&rm -f /lib/libhandle.{a,la,so} &&ln -svf ../../lib/libhandle.so.1 /usr/lib/libhandle.so
就可以了。
