linux-ext4 - [RFC PATCH v2 0/6] ext4: make ext4_map_blocks() recognize delalloc only extent

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Date: Sat, 23 Dec 2023 19:02:17 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [RFC PATCH v2 0/6] ext4: make ext4_map_blocks() recognize delalloc only extent

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

v1->v2:
 - Fix a long standing race issue between determine hole and inserting
   new delalloc extent analyzed by Jan Kara.
 - Change method of adjusting hole length, instead of skip holes in
   ext4_map_blocks(), now we find delalloc and correct length and type
   in ext4_ext_determine_hole().

v1: https://lore.kernel.org/linux-ext4/20231121093429.1827390-1-yi.zhang@huaweicloud.com/

Hello, all!

I'm working on switching ext4 buffer IO from buffer_head to iomap
and enable large folio on regular file recently [1] (I've been fixing a
lot of issues and should be able to send out v2 soon), this patch set
is one of a preparation of this work. It first fix a long standing race
issue between bmap querying and adding new delalloc extents, then
correct the hole length returned by ext4_map_blocks() when user querying
map type and blocks range, after that, make this function and
ext4_set_iomap() are able to distinguish delayed allocated only mapping
from hole, finally BTW cleanup the ext4_iomap_begin_report().

This preparation patch set changes the ext4 map -> iomap converting logic
in ext4_set_iomap(), so that the later buffer IO conversion can use this
helper to connect iomap frame. This patch set is already passed
'kvm-xfstests -g auto' tests.

Thanks,
Yi.

[1] https://lore.kernel.org/linux-ext4/20231123125121.4064694-1-yi.zhang@huaweicloud.com/

Zhang Yi (6):
  ext4: refactor ext4_da_map_blocks()
  ext4: convert to exclusive lock while inserting delalloc extents
  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 delalloc only extent
  ext4: make ext4_set_iomap() recognize IOMAP_DELALLOC map type

 fs/ext4/ext4.h    |   4 +-
 fs/ext4/extents.c | 110 +++++++++++++++++++++++++++-------------------
 fs/ext4/inode.c   |  84 ++++++++++++-----------------------
 3 files changed, 96 insertions(+), 102 deletions(-)

-- 
2.39.2