linux-ext4 - Re: [PATCH v2 0/5] dumpe2fs: add JSON output format

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Message-ID: <87bmglknt9.fsf@openvz.org>
Date:   Mon, 19 Feb 2018 18:21:22 +0300
From:   Dmitry Monakhov <dmonakhov@...nvz.org>
To:     Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>,
        linux-ext4@...r.kernel.org
Cc:     Theodore Ts'o <tytso@....edu>,
        Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
Subject: Re: [PATCH v2 0/5] dumpe2fs: add JSON output format

Viktor Prutyanov <viktor.prutyanov@...tuozzo.com> writes:

> This collection of patches adds support of JSON format.
> First patch adds helpers for creating structured objects and printing such objects in JSON format.
> Others use these helpers for all info from existing operation modes.

> After these patches, for example, using jq utility, we can easily print "blocks" field from specific group:
>
> dumpe2fs /dev/sdb2 -j | jq -r '.desc[] | select(.num == "5") | {blocks:.blocks}'
>
> {
>   "blocks": {
>     "first": "163840",
>     "last": "196607"
Please use conventional extent-like naming [start, len]
>   }
> }
>
> Helpers can later be easily extended to support new output formats (not only JSON).
>
> Viktor Prutyanov (5):
>   libsupport: add JSON output helpers
>   dumpe2fs: add JSON output of block groups
>   dumpe2fs: add JSON output of superblock
>   dumpe2fs: add JSON output of journal
>   dumpe2fs: add JSON output of bad blocks
>
>  debugfs/Makefile.in     |   4 +-
>  lib/e2p/e2p.h           |   8 ++
>  lib/e2p/ljs.c           |  57 ++++++++
>  lib/e2p/ls.c            | 362 ++++++++++++++++++++++++++++++++++++++++++++++++
>  lib/e2p/pe.c            |  18 +++
>  lib/e2p/ps.c            |  10 ++
>  lib/support/Makefile.in |   7 +-
>  lib/support/json-out.c  | 326 +++++++++++++++++++++++++++++++++++++++++++
>  lib/support/json-out.h  |  69 +++++++++
>  misc/Makefile.in        |   8 +-
>  misc/dumpe2fs.8.in      |   3 +
>  misc/dumpe2fs.c         | 323 ++++++++++++++++++++++++++++++++++++++++--
>  12 files changed, 1173 insertions(+), 22 deletions(-)
>  create mode 100644 lib/support/json-out.c
>  create mode 100644 lib/support/json-out.h
>
> -- 
> 2.14.1