linux-ext4 - [RFC PATCH 0/6] ext4: make ext4_map_blocks() recognize delayed only extent

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Date: Tue, 21 Nov 2023 17:34:23 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	ritesh.list@...il.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [RFC PATCH 0/6] ext4: make ext4_map_blocks() recognize delayed only extent

From: Zhang Yi <yi.zhang@...wei.com>

Hello, guys.

I'm working on switching ext4 buffer IO from buffer_head to iomap
and enable large folio on regular file recently, this patch set is one
of a preparation of this work. It first correct the hole length returned
by ext4_map_blocks() when user query mapping type and blocks range, and
then make this function and ext4_set_iomap() are able to distinguish
delayed allocated only mapping from hole, finally cleanup the
ext4_iomap_begin_report() by the way. This preparation patch set changes
the ext4 map -> iomap converting logic in ext4_set_iomap(), so that the
later buffer IO conversion can use it. This patch set is already passed
'kvm-xfstests -g auto' tests.

Thanks,
Yi.

Zhang Yi (6):
  ext4: introduce ext4_es_skip_hole_extent() to skip hole extents
  ext4: make ext4_es_lookup_extent() return the next extent if not found
  ext4: correct the hole length returned by ext4_map_blocks()
  ext4: add a hole extent entry in cache after punch
  ext4: make ext4_map_blocks() distinguish delayed only mapping
  ext4: make ext4_set_iomap() recognize IOMAP_DELALLOC mapping type

 fs/ext4/ext4.h              |  7 ++++-
 fs/ext4/extents.c           |  5 ++--
 fs/ext4/extents_status.c    | 53 ++++++++++++++++++++++++--------
 fs/ext4/extents_status.h    |  2 ++
 fs/ext4/inode.c             | 60 ++++++++++++++++++-------------------
 include/trace/events/ext4.h | 28 +++++++++++++++++
 6 files changed, 107 insertions(+), 48 deletions(-)

-- 
2.39.2