mirror of
https://github.com/reactos/reactos.git
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178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
/*
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* COPYRIGHT: See COPYRIGHT.TXT
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* PROJECT: Ext2 File System Driver for WinNT/2K/XP
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* FILE: recover.c
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* PROGRAMMER: Matt Wu <mattwu@163.com>
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* HOMEPAGE: http://www.ext2fsd.com
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* UPDATE HISTORY:
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*/
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/* INCLUDES *****************************************************************/
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#include <ext2fs.h>
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#include <linux/jbd.h>
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#include <linux/ext3_fs.h>
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/* GLOBALS ***************************************************************/
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extern PEXT2_GLOBAL Ext2Global;
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/* DEFINITIONS *************************************************************/
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, Ext2LoadInternalJournal)
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#pragma alloc_text(PAGE, Ext2CheckJournal)
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#pragma alloc_text(PAGE, Ext2RecoverJournal)
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#endif
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PEXT2_MCB
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Ext2LoadInternalJournal(
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PEXT2_VCB Vcb,
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ULONG jNo
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)
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{
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PEXT2_MCB Jcb = NULL;
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Jcb = Ext2AllocateMcb(Vcb, NULL, NULL, 0);
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if (!Jcb) {
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goto errorout;
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}
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Jcb->Inode.i_ino = jNo;
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Jcb->Inode.i_sb = &Vcb->sb;
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if (!Ext2LoadInode(Vcb, &Jcb->Inode)) {
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DbgBreak();
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Ext2FreeMcb(Vcb, Jcb);
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goto errorout;
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}
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errorout:
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return Jcb;
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}
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INT
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Ext2CheckJournal(
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PEXT2_VCB Vcb,
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PULONG jNo
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)
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{
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struct ext3_super_block* esb = NULL;
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/* check ext3 super block */
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esb = (struct ext3_super_block *)Vcb->SuperBlock;
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if (IsFlagOn(esb->s_feature_incompat,
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EXT3_FEATURE_INCOMPAT_RECOVER)) {
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SetLongFlag(Vcb->Flags, VCB_JOURNAL_RECOVER);
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}
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/* must stop here if volume is read-only */
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if (IsVcbReadOnly(Vcb)) {
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goto errorout;
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}
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/* journal is external ? */
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if (esb->s_journal_inum == 0) {
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goto errorout;
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}
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/* oops: volume is corrupted */
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if (esb->s_journal_dev) {
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goto errorout;
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}
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/* return the journal inode number */
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*jNo = esb->s_journal_inum;
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return TRUE;
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errorout:
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return FALSE;
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}
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INT
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Ext2RecoverJournal(
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PEXT2_IRP_CONTEXT IrpContext,
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PEXT2_VCB Vcb
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)
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{
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INT rc = 0;
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ULONG jNo = 0;
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PEXT2_MCB jcb = NULL;
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struct block_device * bd = &Vcb->bd;
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#ifndef __REACTOS__
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struct super_block * sb = &Vcb->sb;
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#endif
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struct inode * ji = NULL;
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journal_t * journal = NULL;
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struct ext3_super_block *esb;
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ExAcquireResourceExclusiveLite(&Vcb->MainResource, TRUE);
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/* check journal inode number */
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if (!Ext2CheckJournal(Vcb, &jNo)) {
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rc = -1;
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goto errorout;
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}
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/* allocate journal Mcb */
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jcb = Ext2LoadInternalJournal(Vcb, jNo);
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if (!jcb) {
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rc = -6;
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goto errorout;
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}
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/* allocate journal inode */
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ji = &jcb->Inode;
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/* initialize journal file from inode */
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journal = journal_init_inode(ji);
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/* initialzation succeeds ? */
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if (!journal) {
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iput(ji);
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rc = -8;
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goto errorout;
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}
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/* start journal recovery */
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rc = journal_load(journal);
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if (0 != rc) {
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rc = -9;
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DbgPrint("Ext2Fsd: recover_journal: failed "
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"to recover journal data.\n");
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}
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/* reload super_block and group_description */
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Ext2RefreshSuper(IrpContext, Vcb);
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Ext2RefreshGroup(IrpContext, Vcb);
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/* wipe journal data and clear recover flag in sb */
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if (rc == 0) {
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journal_wipe_recovery(journal);
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ClearLongFlag(
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Vcb->SuperBlock->s_feature_incompat,
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EXT3_FEATURE_INCOMPAT_RECOVER );
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Ext2SaveSuper(IrpContext, Vcb);
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sync_blockdev(bd);
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ClearLongFlag(Vcb->Flags, VCB_JOURNAL_RECOVER);
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}
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errorout:
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/* destroy journal structure */
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if (journal) {
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journal_destroy(journal);
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}
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/* destory journal Mcb */
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if (jcb) {
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Ext2FreeMcb(Vcb, jcb);
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}
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ExReleaseResourceLite(&Vcb->MainResource);
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return rc;
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}
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