From: Artem Blagodarenko <artem.blagodarenko@xxxxxxxxxxx>
e2image has no ability to use superblock backup to copy metadata.
This feature can be useful if someone wants to make partition
image and fix it using e2fsck utility.
New -b option allows to pass superblock number, like e2fsck utility do.
e2image doesn't change primary superblock and store is as is, so
it can be fixed using e2fsck latter.
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@xxxxxxxxxxx>
---
misc/e2image.c | 38 ++++++++++++++++++++++++++++++++------
1 files changed, 32 insertions(+), 6 deletions(-)
diff --git a/misc/e2image.c b/misc/e2image.c
index e0c3188..acc27d1 100644
--- a/misc/e2image.c
+++ b/misc/e2image.c
@@ -103,7 +103,8 @@ static int get_bits_from_size(size_t size)
static void usage(void)
{
- fprintf(stderr, _("Usage: %s [ -r|Q ] [ -fr ] device image-file\n"),
+ fprintf(stderr, _("Usage: %s [ -r|Q ] [ -b superblock ] "
+ "[ -fr ] device image-file\n"),
program_name);
fprintf(stderr, _(" %s -I device image-file\n"), program_name);
fprintf(stderr, _(" %s -ra [ -cfnp ] [ -o src_offset ] "
@@ -1255,7 +1256,7 @@ static void output_qcow2_meta_data_blocks(ext2_filsys fs, int fd)
free_qcow2_image(img);
}
-static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags)
+static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags, blk64_t superblock)
{
struct process_block_struct pb;
struct ext2_inode inode;
@@ -1283,6 +1284,22 @@ static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags)
}
}
+ if (superblock) {
+ int j;
+
+ ext2fs_mark_block_bitmap2(meta_block_map, superblock);
+ meta_blocks_count++;
+
+ /*
+ * Mark the backup superblock descriptors
+ */
+ for (j = 0; j < fs->desc_blocks; j++) {
+ ext2fs_mark_block_bitmap2(meta_block_map,
+ ext2fs_descriptor_block_loc2(fs, superblock, j));
+ }
+ meta_blocks_count += fs->desc_blocks;
+ }
+
mark_table_blocks(fs);
if (show_progress)
fprintf(stderr, "%s", _("Scanning inodes...\n"));
@@ -1462,6 +1479,7 @@ int main (int argc, char ** argv)
int ignore_rw_mount = 0;
int check = 0;
struct stat st;
+ blk64_t superblock = 0;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
@@ -1475,7 +1493,7 @@ int main (int argc, char ** argv)
if (argc && *argv)
program_name = *argv;
add_error_table(&et_ext2_error_table);
- while ((c = getopt(argc, argv, "nrsIQafo:O:pc")) != EOF)
+ while ((c = getopt(argc, argv, "nrsIQafo:O:pcb:")) != EOF)
switch (c) {
case 'I':
flags |= E2IMAGE_INSTALL_FLAG;
@@ -1514,6 +1532,9 @@ int main (int argc, char ** argv)
case 'c':
check = 1;
break;
+ case 'b':
+ superblock = strtoull(optarg, NULL, 0);
+ break;
default:
usage();
}
@@ -1528,6 +1549,11 @@ int main (int argc, char ** argv)
"with raw or QCOW2 images."));
exit(1);
}
+ if (superblock && !img_type) {
+ com_err(program_name, 0, "%s", _("-b option can only be used "
+ "with raw or QCOW2 images."));
+ exit(1);
+ }
if ((source_offset || dest_offset) && img_type != E2IMAGE_RAW) {
com_err(program_name, 0, "%s",
_("Offsets are only allowed with raw images."));
@@ -1578,8 +1604,8 @@ int main (int argc, char ** argv)
}
}
sprintf(offset_opt, "offset=%llu", source_offset);
- retval = ext2fs_open2(device_name, offset_opt, open_flag, 0, 0,
- unix_io_manager, &fs);
+ retval = ext2fs_try_open_fs(device_name, offset_opt, superblock, 0,
+ open_flag, unix_io_manager, &fs);
if (retval) {
com_err (program_name, retval, _("while trying to open %s"),
device_name);
@@ -1664,7 +1690,7 @@ skip_device:
exit(1);
}
if (img_type)
- write_raw_image_file(fs, fd, img_type, flags);
+ write_raw_image_file(fs, fd, img_type, flags, superblock);
else
write_image_file(fs, fd);
--
1.7.1
