[PATCH 00/10] ext4: simplify the counting and management of delalloc reserved blocks

[Zhang Yi <yi.zhang@huaweicloud.com>]

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

Hello!

This patch series is the part 3 prepartory changes of the buffered IO
iomap conversion, it simplify the counting and updating logic of delalloc
reserved blocks. I picked them out from my buffered IO iomap conversion
RFC series v4[1], and did some minor change log messages improvement.
It's based on the part 2 prepartory series [2] (not merged yet) +
6.10-rc1.

Patch 1-3 simplify the delalloc extent management logic by changes to
always set EXT4_GET_BLOCKS_DELALLOC_RESERVE flag when allocating
preallocated blocks, and don't add EXTENT_STATUS_DELAYED flag to an
unwritten extent, which means ext4_es_is_delayed() is equal to
ext4_es_is_delonly().

Patch 4-6 simplify the reserved blocks updating logic by moves the
reserved blocks updating from ext4_{ind|ext}_map_blocks() to
ext4_es_insert_extent().

Patch 7-10 drop the unused code (e.g. ext4_es_is_delonly())and update
comments.

This series has passed through kvm-xfstests in auto mode many times,
please take a look at it.

[1] https://lore.kernel.org/linux-ext4/20240410142948.2817554-1-yi.zhang@huaweicloud.com/
[2] https://lore.kernel.org/linux-ext4/20240517124005.347221-1-yi.zhang@huaweicloud.com/

Thanks,
Yi.

Zhang Yi (10):
  ext4: factor out ext4_map_create_blocks() to allocate new blocks
  ext4: optimize the EXT4_GET_BLOCKS_DELALLOC_RESERVE flag set
  ext4: don't set EXTENT_STATUS_DELAYED on allocated blocks
  ext4: let __revise_pending() return newly inserted pendings
  ext4: count removed reserved blocks for delalloc only extent entry
  ext4: update delalloc data reserve spcae in ext4_es_insert_extent()
  ext4: drop ext4_es_delayed_clu()
  ext4: use ext4_map_query_blocks() in ext4_map_blocks()
  ext4: drop ext4_es_is_delonly()
  ext4: drop all delonly descriptions

 fs/ext4/extents.c        |  37 ------
 fs/ext4/extents_status.c | 271 ++++++++++++++++-----------------------
 fs/ext4/extents_status.h |   7 -
 fs/ext4/indirect.c       |   7 -
 fs/ext4/inode.c          | 197 +++++++++++++---------------
 5 files changed, 195 insertions(+), 324 deletions(-)

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2.31.1