From: "Aneesh Kumar K.V" Subject: [PATCH 2/4] e2fsprogs: Add undoe2fs Date: Wed, 1 Aug 2007 07:34:07 +0530 Message-ID: <11859338581413-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <11859338491592-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Cc: linux-ext4@vger.kernel.org, "Aneesh Kumar K.V" To: tytso@mit.edu Return-path: Received: from ausmtp04.au.ibm.com ([202.81.18.152]:53700 "EHLO ausmtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753039AbXHACEY (ORCPT ); Tue, 31 Jul 2007 22:04:24 -0400 Received: from d23relay01.au.ibm.com (d23relay01.au.ibm.com [202.81.18.232]) by ausmtp04.au.ibm.com (8.13.8/8.13.8) with ESMTP id l71278Fm211068 for ; Wed, 1 Aug 2007 12:07:08 +1000 Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.250.237]) by d23relay01.au.ibm.com (8.13.8/8.13.8/NCO v8.4) with ESMTP id l7123ZFw216878 for ; Wed, 1 Aug 2007 12:03:35 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l7124Lwp008642 for ; Wed, 1 Aug 2007 12:04:22 +1000 In-Reply-To: <11859338491592-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Message-Id: <47f96570519d76b8d59f92b729a0a48c4a1b68d8.1185933778.git.aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: References: Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Aneesh Kumar K.V undoe2fs can be used to replay the transaction saved in the transaction file using undo I/O Manager Signed-off-by: Aneesh Kumar K.V --- misc/Makefile.in | 10 +++++- misc/undoe2fs.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+), 2 deletions(-) create mode 100644 misc/undoe2fs.c diff --git a/misc/Makefile.in b/misc/Makefile.in index ccad78c..51bb17a 100644 --- a/misc/Makefile.in +++ b/misc/Makefile.in @@ -15,7 +15,7 @@ INSTALL = @INSTALL@ @IMAGER_CMT@E2IMAGE_MAN= e2image.8 SPROGS= mke2fs badblocks tune2fs dumpe2fs blkid logsave \ - $(E2IMAGE_PROG) @FSCK_PROG@ + $(E2IMAGE_PROG) @FSCK_PROG@ undoe2fs USPROGS= mklost+found filefrag SMANPAGES= tune2fs.8 mklost+found.8 mke2fs.8 dumpe2fs.8 badblocks.8 \ e2label.8 findfs.8 blkid.8 $(E2IMAGE_MAN) \ @@ -39,6 +39,7 @@ E2IMAGE_OBJS= e2image.o FSCK_OBJS= fsck.o base_device.o BLKID_OBJS= blkid.o FILEFRAG_OBJS= filefrag.o +UNDOE2FS_OBJS= undoe2fs.o XTRA_CFLAGS= -I$(srcdir)/../e2fsck -I. @@ -47,7 +48,7 @@ SRCS= $(srcdir)/tune2fs.c $(srcdir)/mklost+found.c $(srcdir)/mke2fs.c \ $(srcdir)/badblocks.c $(srcdir)/fsck.c $(srcdir)/util.c \ $(srcdir)/uuidgen.c $(srcdir)/blkid.c $(srcdir)/logsave.c \ $(srcdir)/filefrag.c $(srcdir)/base_device.c \ - $(srcdir)/../e2fsck/profile.c + $(srcdir)/../e2fsck/profile.c $(srcdir)/undoe2fs.c LIBS= $(LIBEXT2FS) $(LIBCOM_ERR) DEPLIBS= $(LIBEXT2FS) $(LIBCOM_ERR) @@ -108,6 +109,10 @@ e2image: $(E2IMAGE_OBJS) $(DEPLIBS) @echo " LD $@" @$(CC) $(ALL_LDFLAGS) -o e2image $(E2IMAGE_OBJS) $(LIBS) $(LIBINTL) +undoe2fs: $(UNDOE2FS_OBJS) $(DEPLIBS) + @echo " LD $@" + @$(CC) $(ALL_LDFLAGS) -o undoe2fs $(UNDOE2FS_OBJS) $(LIBS) + base_device: base_device.c @echo " LD $@" @$(CC) $(ALL_CFLAGS) $(ALL_LDFLAGS) $(srcdir)/base_device.c \ @@ -434,3 +439,4 @@ filefrag.o: $(srcdir)/filefrag.c base_device.o: $(srcdir)/base_device.c $(srcdir)/fsck.h profile.o: $(srcdir)/../e2fsck/profile.c $(top_srcdir)/lib/et/com_err.h \ $(srcdir)/../e2fsck/profile.h prof_err.h +undoe2fs.o: $(srcdir)/undoe2fs.c $(top_srcdir)/lib/ext2fs/tdb.h diff --git a/misc/undoe2fs.c b/misc/undoe2fs.c new file mode 100644 index 0000000..d14d44a --- /dev/null +++ b/misc/undoe2fs.c @@ -0,0 +1,77 @@ +/* + * Copyright IBM Corporation, 2007 + * Author Aneesh Kumar K.V + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#include +#include +#include +#if HAVE_ERRNO_H +#include +#endif +#include "ext2fs/tdb.h" + +void usage(char *prg_name) +{ + fprintf(stderr, + "Usage: %s \n", prg_name); + exit(1); + +} + + +main(int argc, char *argv[]) +{ + TDB_CONTEXT *tdb; + TDB_DATA key, data; + unsigned long blk_num; + unsigned long long int location; + int fd, retval; + + if (argc != 3) + usage(argv[0]); + + tdb = tdb_open(argv[1], 0, 0, O_RDONLY, 0600); + + if (!tdb) { + fprintf(stderr, "Failed tdb_open %s\n", strerror(errno)); + exit(1); + } + + fd = open(argv[2], O_WRONLY); + if (fd == -1) { + fprintf(stderr, "Failed open %s\n", strerror(errno)); + exit(1); + } + + for (key = tdb_firstkey(tdb); key.dptr; key = tdb_nextkey(tdb, key)) { + data = tdb_fetch(tdb, key); + if (!data.dptr) { + fprintf(stderr, + "Failed tdb_fetch %s\n", tdb_errorstr(tdb)); + exit(1); + } + blk_num = *(unsigned long *)key.dptr; + location = blk_num * data.dsize; + printf("Replayed transaction of size %d at location %ld\n", + data.dsize, blk_num); + retval = lseek(fd, location, SEEK_SET); + if (retval == -1) { + fprintf(stderr, "Failed lseek %s\n", strerror(errno)); + exit(1); + } + retval = write(fd, data.dptr, data.dsize); + if (retval == -1) { + fprintf(stderr, "Failed write %s\n", strerror(errno)); + exit(1); + } + } + close(fd); + tdb_close(tdb); + +} -- 1.5.3.rc2.22.g69a9b-dirty