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Date: Tue, 15 Jan 2013 15:31:23 -0500
From: Phillip Susi <psusi@...ntu.com>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>, Phillip Susi <psusi@...ntu.com>
Subject: [PATCH] e2image: add -a switch to include all data
Normally the raw and QCOW2 images only contain fs metadata.
Add a new switch ( -a ) to include all data. This makes it
possible to use e2image to clone a whole filesystem.
Signed-off-by: Phillip Susi <psusi@...ntu.com>
---
misc/e2image.8.in | 22 +++++++++++++++++++++-
misc/e2image.c | 31 ++++++++++++++++++++++++-------
2 files changed, 45 insertions(+), 8 deletions(-)
diff --git a/misc/e2image.8.in b/misc/e2image.8.in
index 8876e77..f8205a6 100644
--- a/misc/e2image.8.in
+++ b/misc/e2image.8.in
@@ -8,7 +8,7 @@ e2image \- Save critical ext2/ext3/ext4 filesystem metadata to a file
.SH SYNOPSIS
.B e2image
[
-.B \-rsI
+.B \-rsIQa
]
.I device
.I image-file
@@ -171,6 +171,26 @@ is regular QCOW2 image and can be processed by tools aware of QCOW2 format
such as for example
.BR qemu-img .
.PP
+You can convert a qcow2 image into a raw image with:
+.PP
+.br
+\ \fBe2image \-r hda1.qcow2 hda1.raw\fR
+.br
+.PP
+This can be useful to write a qcow2 image containing all data to a
+sparse image file where it can be loop mounted, or to a disk partition.
+Note that this may not work with qcow2 images not generated by e2image.
+.PP
+.SH INCLUDING DATA
+Normally
+.B e2image
+only includes fs metadata, not regular file data. The
+.B \-a
+option can be specified to include all data. This will
+give an image that is suitible to use to clone the entire FS or
+for backup purposes. Note that this option only works with the
+raw or QCOW2 formats.
+.PP
.SH AUTHOR
.B e2image
was written by Theodore Ts'o (tytso@....edu).
diff --git a/misc/e2image.c b/misc/e2image.c
index e6ea52a..3d77e76 100644
--- a/misc/e2image.c
+++ b/misc/e2image.c
@@ -52,6 +52,9 @@ extern int optind;
const char * program_name = "e2image";
char * device_name = NULL;
+char all_data;
+char output_is_blk;
+/* writing to blk device: don't skip zeroed blocks */
static void lseek_error_and_exit(int errnum)
{
@@ -84,7 +87,7 @@ static int get_bits_from_size(size_t size)
static void usage(void)
{
- fprintf(stderr, _("Usage: %s [-rsIQ] device image_file\n"),
+ fprintf(stderr, _("Usage: %s [-rsIQa] device image_file\n"),
program_name);
exit (1);
}
@@ -309,7 +312,7 @@ static int process_file_block(ext2_filsys fs EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data EXT2FS_ATTR((unused)))
{
- if (blockcnt < 0) {
+ if (blockcnt < 0 || all_data) {
ext2fs_mark_block_bitmap2(meta_block_map, *block_nr);
meta_blocks_count++;
}
@@ -341,11 +344,12 @@ static void mark_table_blocks(ext2_filsys fs)
/*
* Mark the blocks used for the inode table
*/
- if (!ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) &&
+ if ((output_is_blk || !ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)) &&
ext2fs_inode_table_loc(fs, i)) {
unsigned int end = (unsigned) fs->inode_blocks_per_group;
/* skip unused blocks */
- if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ if (!output_is_blk &&
+ EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
end -= (ext2fs_bg_itable_unused(fs, i) /
EXT2_INODES_PER_BLOCK(fs->super));
@@ -387,6 +391,8 @@ static int check_zero_block(char *buf, int blocksize)
char *cp = buf;
int left = blocksize;
+ if (output_is_blk)
+ return 0;
while (left > 0) {
if (*cp++)
return 0;
@@ -1134,7 +1140,7 @@ static void write_raw_image_file(ext2_filsys fs, int fd, int type, int flags)
if ((inode.i_flags & EXT4_EXTENTS_FL) ||
inode.i_block[EXT2_IND_BLOCK] ||
inode.i_block[EXT2_DIND_BLOCK] ||
- inode.i_block[EXT2_TIND_BLOCK]) {
+ inode.i_block[EXT2_TIND_BLOCK] || all_data) {
retval = ext2fs_block_iterate3(fs,
ino, BLOCK_FLAG_READ_ONLY, block_buf,
process_file_block, &pb);
@@ -1249,6 +1255,7 @@ int main (int argc, char ** argv)
int qcow2_fd = 0;
int fd = 0;
int ret = 0;
+ struct stat st;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
@@ -1262,7 +1269,7 @@ int main (int argc, char ** argv)
if (argc && *argv)
program_name = *argv;
add_error_table(&et_ext2_error_table);
- while ((c = getopt(argc, argv, "rsIQ")) != EOF)
+ while ((c = getopt(argc, argv, "rsIQa")) != EOF)
switch (c) {
case 'I':
flags |= E2IMAGE_INSTALL_FLAG;
@@ -1280,6 +1287,9 @@ int main (int argc, char ** argv)
case 's':
flags |= E2IMAGE_SCRAMBLE_FLAG;
break;
+ case 'a':
+ all_data = 1;
+ break;
default:
usage();
}
@@ -1327,7 +1337,14 @@ skip_device:
"the stdout!\n");
exit(1);
}
-
+ if (fd != 1) {
+ if (fstat(fd, &st)) {
+ com_err(program_name, 0, "Can not stat output\n");
+ exit(1);
+ }
+ if (S_ISBLK(st.st_mode))
+ output_is_blk = 1;
+ }
if (flags & E2IMAGE_IS_QCOW2_FLAG) {
ret = qcow2_write_raw_image(qcow2_fd, fd, header);
if (ret) {
--
1.7.9.5
--
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