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Date:   Mon, 14 Sep 2020 18:30:58 +0300
From:   Благодаренко Артём 
        <artem.blagodarenko@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     adilger.kernel@...ger.ca, alexey.lyashkov@...il.com,
        Alexey Lyashkov <alexey.lyashkov@....com>,
        Artem Blagodarenko <artem.blagodarenko@....com>
Subject: Re: [PATCH v3] e2image: add option to ignore fs errors

Hello,

Should I fix something in this patch?

Thanks,

Artem Blagodarenko.

> On 18 Aug 2020, at 10:17, Artem Blagodarenko <artem.blagodarenko@...il.com> wrote:
> 
> From: Alexey Lyashkov <alexey.lyashkov@....com>
> 
> Add extended "-E ignore_error" option to be more tolerant
> to fs errors while scanning inode extents.
> 
> This is 6th version of the patch set. Changes:
> 
> *more obvious binaries existence check in test
> *finish test if e2image can't capture an image
> 
> Signed-off-by: Alexey Lyashkov <alexey.lyashkov@....com>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@....com>
> Cray-bug-id: LUS-1922
> Change-Id: Ib79300656726839b1d3b7ee1dd0793c60679d296
> Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> lib/support/Makefile.in          |  4 +++
> lib/support/mvstring.c           | 25 +++++++++++++++
> lib/support/mvstring.h           |  1 +
> misc/e2image.8.in                |  3 ++
> misc/e2image.c                   | 53 +++++++++++++++++++++++++++++---
> misc/e2initrd_helper.c           | 16 +---------
> tests/i_error_tolerance/expect.1 | 23 ++++++++++++++
> tests/i_error_tolerance/expect.2 |  7 +++++
> tests/i_error_tolerance/script   | 47 ++++++++++++++++++++++++++++
> 9 files changed, 160 insertions(+), 19 deletions(-)
> create mode 100644 lib/support/mvstring.c
> create mode 100644 lib/support/mvstring.h
> create mode 100644 tests/i_error_tolerance/expect.1
> create mode 100644 tests/i_error_tolerance/expect.2
> create mode 100644 tests/i_error_tolerance/script
> 
> diff --git a/lib/support/Makefile.in b/lib/support/Makefile.in
> index 1d278642..4d04eef0 100644
> --- a/lib/support/Makefile.in
> +++ b/lib/support/Makefile.in
> @@ -13,6 +13,7 @@ INSTALL = @INSTALL@
> all::
> 
> OBJS=		cstring.o \
> +		mvstring.o \
> 		mkquota.o \
> 		plausible.o \
> 		profile.o \
> @@ -26,6 +27,7 @@ OBJS=		cstring.o \
> 
> SRCS=		$(srcdir)/argv_parse.c \
> 		$(srcdir)/cstring.c \
> +		$(srcdir)/mvstring.c \
> 		$(srcdir)/mkquota.c \
> 		$(srcdir)/parse_qtype.c \
> 		$(srcdir)/plausible.c \
> @@ -105,6 +107,8 @@ argv_parse.o: $(srcdir)/argv_parse.c $(top_builddir)/lib/config.h \
>  $(top_builddir)/lib/dirpaths.h $(srcdir)/argv_parse.h
> cstring.o: $(srcdir)/cstring.c $(top_builddir)/lib/config.h \
>  $(top_builddir)/lib/dirpaths.h $(srcdir)/cstring.h
> +mvstring.o: $(srcdir)/mvstring.c $(top_builddir)/lib/config.h \
> + $(srcdir)/mvstring.h
> mkquota.o: $(srcdir)/mkquota.c $(top_builddir)/lib/config.h \
>  $(top_builddir)/lib/dirpaths.h $(top_srcdir)/lib/ext2fs/ext2_fs.h \
>  $(top_builddir)/lib/ext2fs/ext2_types.h $(top_srcdir)/lib/ext2fs/ext2fs.h \
> diff --git a/lib/support/mvstring.c b/lib/support/mvstring.c
> new file mode 100644
> index 00000000..1ed2fd67
> --- /dev/null
> +++ b/lib/support/mvstring.c
> @@ -0,0 +1,25 @@
> +#include "config.h"
> +#ifdef HAVE_STDLIB_H
> +#include <stdlib.h>
> +#endif
> +#include <ctype.h>
> +#include <string.h>
> +#include "mvstring.h"
> +
> +
> +/*
> + * fstab parsing code
> + */
> +char *string_copy(const char *s)
> +{
> +	char	*ret;
> +
> +	if (!s)
> +		return 0;
> +	ret = malloc(strlen(s)+1);
> +	if (ret)
> +		strcpy(ret, s);
> +	return ret;
> +}
> +
> +
> diff --git a/lib/support/mvstring.h b/lib/support/mvstring.h
> new file mode 100644
> index 00000000..94590d56
> --- /dev/null
> +++ b/lib/support/mvstring.h
> @@ -0,0 +1 @@
> +extern char *string_copy(const char *s);
> diff --git a/misc/e2image.8.in b/misc/e2image.8.in
> index ef124867..3816b682 100644
> --- a/misc/e2image.8.in
> +++ b/misc/e2image.8.in
> @@ -73,6 +73,9 @@ for the image file to be in a consistent state.  This requirement can be
> overridden using the
> .B \-f
> option, but the resulting image file is very likely not going to be useful.
> +If you going to grab an image from a corrupted FS
> +.B \-E ignore_error
> +option to ignore fs errors, allows to grab fs image from a corrupted fs.
> .PP
> If
> .I image-file
> diff --git a/misc/e2image.c b/misc/e2image.c
> index 892c5371..887c38f2 100644
> --- a/misc/e2image.c
> +++ b/misc/e2image.c
> @@ -52,6 +52,7 @@ extern int optind;
> 
> #include "support/nls-enable.h"
> #include "support/plausible.h"
> +#include "support/mvstring.h"
> #include "../version.h"
> 
> #define QCOW_OFLAG_COPIED     (1ULL << 63)
> @@ -78,6 +79,7 @@ static char move_mode;
> static char show_progress;
> static char *check_buf;
> static int skipped_blocks;
> +static int ignore_error = 0;
> 
> static blk64_t align_offset(blk64_t offset, unsigned int n)
> {
> @@ -105,7 +107,7 @@ static int get_bits_from_size(size_t size)
> static void usage(void)
> {
> 	fprintf(stderr, _("Usage: %s [ -r|-Q ] [ -f ] [ -b superblock ] [ -B blocksize ] "
> -			  "device image-file\n"),
> +			  "[-E extended-options] device image-file\n"),
> 		program_name);
> 	fprintf(stderr, _("       %s -I device image-file\n"), program_name);
> 	fprintf(stderr, _("       %s -ra [ -cfnp ] [ -o src_offset ] "
> @@ -1368,7 +1370,8 @@ static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags,
> 				com_err(program_name, retval,
> 					_("while iterating over inode %u"),
> 					ino);
> -				exit(1);
> +				if (ignore_error == 0)
> +					exit(1);
> 			}
> 		} else {
> 			if ((inode.i_flags & EXT4_EXTENTS_FL) ||
> @@ -1381,7 +1384,8 @@ static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags,
> 				if (retval) {
> 					com_err(program_name, retval,
> 					_("while iterating over inode %u"), ino);
> -					exit(1);
> +					if (ignore_error == 0)
> +						exit(1);
> 				}
> 			}
> 		}
> @@ -1475,6 +1479,40 @@ static struct ext2_qcow2_hdr *check_qcow2_image(int *fd, char *name)
> 	return qcow2_read_header(*fd);
> }
> 
> +static void parse_extended_opts(const char *opts)
> +{
> +	char	*buf, *token, *next, *p;
> +	int	ea_ver;
> +	int	extended_usage = 0;
> +	unsigned long long reada_kb;
> +
> +	buf = string_copy(opts);
> +	for (token = buf; token && *token; token = next) {
> +		p = strchr(token, ',');
> +		next = 0;
> +		if (p) {
> +			*p = 0;
> +			next = p+1;
> +		}
> +		if (strcmp(token, "ignore_error") == 0) {
> +			ignore_error = 1;
> +			continue;
> +		} else {
> +			fprintf(stderr, _("Unknown extended option: %s\n"),
> +				token);
> +			extended_usage++;
> +		}
> +	}
> +	free(buf);
> +
> +	if (extended_usage) {
> +		fputs(_("\nExtended options are separated by commas. "
> +		       "Valid extended options are:\n\n"), stderr);
> +		fputs("\tignore_error\n", stderr);
> +		exit(1);
> +	}
> +}
> +
> int main (int argc, char ** argv)
> {
> 	int c;
> @@ -1494,6 +1532,7 @@ int main (int argc, char ** argv)
> 	struct stat st;
> 	blk64_t superblock = 0;
> 	int blocksize = 0;
> +	char	*extended_opts = 0;
> 
> #ifdef ENABLE_NLS
> 	setlocale(LC_MESSAGES, "");
> @@ -1507,7 +1546,7 @@ int main (int argc, char ** argv)
> 	if (argc && *argv)
> 		program_name = *argv;
> 	add_error_table(&et_ext2_error_table);
> -	while ((c = getopt(argc, argv, "b:B:nrsIQafo:O:pc")) != EOF)
> +	while ((c = getopt(argc, argv, "b:B:E:nrsIQafo:O:pc")) != EOF)
> 		switch (c) {
> 		case 'b':
> 			superblock = strtoull(optarg, NULL, 0);
> @@ -1515,6 +1554,9 @@ int main (int argc, char ** argv)
> 		case 'B':
> 			blocksize = strtoul(optarg, NULL, 0);
> 			break;
> +		case 'E':
> +			extended_opts = optarg;
> +			break;
> 		case 'I':
> 			flags |= E2IMAGE_INSTALL_FLAG;
> 			break;
> @@ -1597,6 +1639,9 @@ int main (int argc, char ** argv)
> 		exit(1);
> 	}
> 
> +	if (extended_opts)
> +		parse_extended_opts(extended_opts);
> +
> 	if (img_type && !ignore_rw_mount &&
> 	    (mount_flags & EXT2_MF_MOUNTED) &&
> 	   !(mount_flags & EXT2_MF_READONLY)) {
> diff --git a/misc/e2initrd_helper.c b/misc/e2initrd_helper.c
> index 436aab8c..ab5991a4 100644
> --- a/misc/e2initrd_helper.c
> +++ b/misc/e2initrd_helper.c
> @@ -36,6 +36,7 @@ extern char *optarg;
> #include "ext2fs/ext2fs.h"
> #include "blkid/blkid.h"
> #include "support/nls-enable.h"
> +#include "support/mvstring.h"
> 
> #include "../version.h"
> 
> @@ -151,21 +152,6 @@ static int mem_file_eof(struct mem_file *file)
> 	return (file->ptr >= file->size);
> }
> 
> -/*
> - * fstab parsing code
> - */
> -static char *string_copy(const char *s)
> -{
> -	char	*ret;
> -
> -	if (!s)
> -		return 0;
> -	ret = malloc(strlen(s)+1);
> -	if (ret)
> -		strcpy(ret, s);
> -	return ret;
> -}
> -
> static char *skip_over_blank(char *cp)
> {
> 	while (*cp && isspace(*cp))
> diff --git a/tests/i_error_tolerance/expect.1 b/tests/i_error_tolerance/expect.1
> new file mode 100644
> index 00000000..8d5ffa2c
> --- /dev/null
> +++ b/tests/i_error_tolerance/expect.1
> @@ -0,0 +1,23 @@
> +Pass 1: Checking inodes, blocks, and sizes
> +Inode 12 has illegal block(s).  Clear? yes
> +
> +Illegal indirect block (1000000) in inode 12.  CLEARED.
> +Inode 12, i_blocks is 34, should be 24.  Fix? yes
> +
> +Pass 2: Checking directory structure
> +Pass 3: Checking directory connectivity
> +Pass 4: Checking reference counts
> +Pass 5: Checking group summary information
> +Block bitmap differences:  -(31--34) -37
> +Fix? yes
> +
> +Free blocks count wrong for group #0 (62, counted=67).
> +Fix? yes
> +
> +Free blocks count wrong (62, counted=67).
> +Fix? yes
> +
> +
> +test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
> +test_filesys: 12/16 files (8.3% non-contiguous), 33/100 blocks
> +Exit status is 1
> diff --git a/tests/i_error_tolerance/expect.2 b/tests/i_error_tolerance/expect.2
> new file mode 100644
> index 00000000..7fd42318
> --- /dev/null
> +++ b/tests/i_error_tolerance/expect.2
> @@ -0,0 +1,7 @@
> +Pass 1: Checking inodes, blocks, and sizes
> +Pass 2: Checking directory structure
> +Pass 3: Checking directory connectivity
> +Pass 4: Checking reference counts
> +Pass 5: Checking group summary information
> +test_filesys: 12/16 files (8.3% non-contiguous), 33/100 blocks
> +Exit status is 0
> diff --git a/tests/i_error_tolerance/script b/tests/i_error_tolerance/script
> new file mode 100644
> index 00000000..6503de97
> --- /dev/null
> +++ b/tests/i_error_tolerance/script
> @@ -0,0 +1,47 @@
> +if ! test -x $E2IMAGE_EXE; then
> +	echo "$test_name: $test_description: skipped (no e2image)"
> +	return 0
> +fi
> +if ! test -x $DEBUGFS_EXE; then
> +	echo "$test_name: $test_description: skipped (no debugfs)"
> +	return 0
> +fi
> +
> +SKIP_GUNZIP="true"
> +
> +TEST_DATA="$test_name.tmp"
> +dd if=/dev/urandom of=$TEST_DATA bs=1k count=16 > /dev/null 2>&1 
> +
> +dd if=/dev/zero of=$TMPFILE bs=1k count=100 > /dev/null 2>&1
> +$MKE2FS -Ft ext4 -O ^extents $TMPFILE > /dev/null 2>&1
> +$DEBUGFS -w $TMPFILE << EOF  > /dev/null 2>&1
> +write $TEST_DATA testfile
> +set_inode_field testfile block[IND] 1000000
> +q
> +EOF
> +
> +$E2IMAGE -r $TMPFILE $TMPFILE.back
> +
> +if [ $? = 0 ] ; then
> +	echo "Image expected to be broken"
> +	echo "$test_name: $test_description: fail"
> +	touch $test_name.failed
> +	return 0
> +fi
> +
> +$E2IMAGE -r -E ignore_error $TMPFILE $TMPFILE.back
> +
> +if [ $? = 1 ] ; then
> +	echo "Can not get image even with ignore_error"
> +	echo "$test_name: $test_description: fail"
> +	touch $test_name.failed
> +	return 0
> +fi
> +
> +mv $TMPFILE.back $TMPFILE
> +
> +. $cmd_dir/run_e2fsck
> +
> +rm -f $TEST_DATA
> +
> +unset E2FSCK_TIME TEST_DATA
> -- 
> 2.18.4
> 

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