linux-kernel - [RFC PATCH v2 0/2] erofs: support compressed fragments data

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Date:   Sat, 27 Aug 2022 15:47:55 +0800
From:   Yue Hu <zbestahu@...il.com>
To:     xiang@...nel.org, chao@...nel.org
Cc:     linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        zhangwen@...lpad.com, shaojunjun@...lpad.com,
        Yue Hu <huyue2@...lpad.com>
Subject: [RFC PATCH v2 0/2] erofs: support compressed fragments data

From: Yue Hu <huyue2@...lpad.com>

This feature can merge tail of per-file or the whole files into a
special inode to achieve greater compression ratio.

Meanwhile, also add a interlaced uncompressed data layout support for
compressed files since fragments feature (and later) can use it.

mkfs v4: https://lore.kernel.org/all/cover.1661087840.git.huyue2@coolpad.com/

changes from v1:
 - fix a compiling error without CONFIG_EROFS_FS_ZIP, reported by kernel test
   robot <lkp@...el.com>;
 - introduce the term 'interlaced' for patch 1/2 suggested by Xiang;
 - fix packed inode failure path when read super pointed out by Xiang;
 - use kmap_local_page instead of kmap_atomic pointed out by Xiang;
 - use a simpler way to avoid call read fragment data twice suggested by Xiang;
 - update commit message change.

Yue Hu (2):
  erofs: support interlaced uncompressed data for compressed files
  erofs: support on-disk compressed fragments data

 fs/erofs/compress.h     |  3 +++
 fs/erofs/decompressor.c | 12 +++++----
 fs/erofs/erofs_fs.h     | 28 ++++++++++++++-----
 fs/erofs/internal.h     | 16 ++++++++---
 fs/erofs/super.c        | 15 +++++++++++
 fs/erofs/sysfs.c        |  2 ++
 fs/erofs/zdata.c        | 59 +++++++++++++++++++++++++++++++++++++++--
 fs/erofs/zdata.h        |  3 +++
 fs/erofs/zmap.c         | 35 ++++++++++++++++++++++--
 9 files changed, 155 insertions(+), 18 deletions(-)

-- 
2.17.1