linux-ext4 - [PATCH v7 0/4] e2image -b option to pass superblock number

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Message-Id: <20190129175134.26652-1-c17828@cray.com>
Date:   Tue, 29 Jan 2019 20:51:30 +0300
From:   Artem Blagodarenko <artem.blagodarenko@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     adilger.kernel@...ger.ca
Subject: [PATCH v7 0/4] e2image -b option to pass superblock number

There was a discussion about possibility of using
superblock backup for creating images with e2image.

https://www.spinics.net/lists/linux-ext4/msg30583.html

Now our customer faced with situation then it would be
useful to have image file from partition with broken
superblock.

Here is set of patches that adds this functionality.

This is 7th version of the patch set.

Changes from previous version:

* Only two cases in try_open_fs() now: with and without passed
  superblock size.
* Some minor code style and comments issues are fixed.

Artem Blagodarenko (4):
  ext2fs: opening filesystem code refactoring
  e2image: add -b and -B options to use supperblock backup
  tests: add test for e2image -b option
  ext2fs: automaticlly open backup superblocks

 e2fsck/e2fsck.h             |   2 -
 e2fsck/message.c            |   3 +-
 e2fsck/unix.c               |  42 ++++---------
 e2fsck/util.c               |  73 -----------------------
 lib/ext2fs/openfs.c         |  39 ++++++++++--
 lib/support/Makefile.in     |   8 ++-
 lib/support/sb_backup.c     | 140 ++++++++++++++++++++++++++++++++++++++++++++
 lib/support/sb_backup.h     |  20 +++++++
 misc/dumpe2fs.c             |  17 +-----
 misc/e2image.8.in           |  33 +++++++++++
 misc/e2image.c              |  50 ++++++++++++++--
 tests/i_zero_super/expect.1 |  22 +++++++
 tests/i_zero_super/image.gz | Bin 0 -> 13262 bytes
 tests/i_zero_super/script   |  11 ++++
 14 files changed, 328 insertions(+), 132 deletions(-)
 create mode 100644 lib/support/sb_backup.c
 create mode 100644 lib/support/sb_backup.h
 create mode 100644 tests/i_zero_super/expect.1
 create mode 100644 tests/i_zero_super/image.gz
 create mode 100644 tests/i_zero_super/script

-- 
2.14.3