[PATCH v3 00/10] ext4: support adding multi-delalloc blocks

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

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

Changes since v2:
 - Improve the commit message in patch 2,4,6 as Ritesh and Jan
   suggested, makes the changes more clear.
 - Add patch 3, add a warning if the delalloc counters are still not
   zero on inactive.
 - In patch 6, add a WARN in ext4_es_insert_delayed_extent(), strictly
   requires the end_allocated parameter to be set to false if the
   inserting extent belongs to one cluster.
 - In patch 9, modify the reserve blocks math formula as Jan suggested,
   prevent the count going to be negative.
 - In patch 10, update the stale ext4_da_map_blocks() function comments.

Hello!

This patch series is the part 2 prepartory changes of the buffered IO
iomap conversion, I picked them out from my buffered IO iomap conversion
RFC series v3[1], add a fix for an issue found in current ext4 code, and
also add bigalloc feature support. Please look the following patches for
details.

The first 3 patches fix an incorrect delalloc reserved blocks count
issue and add a warning to make it easy to detect, the second 6 patches
make ext4_insert_delayed_block() call path support inserting
multi-delalloc blocks once a time, and the last patch makes
ext4_da_map_blocks() buffer_head unaware, prepared for iomap.

This patch set has been passed 'kvm-xfstests -g auto' tests, I hope it
could be reviewed and merged first.

[1] https://lore.kernel.org/linux-ext4/20240127015825.1608160-1-yi.zhang@huaweicloud.com/

Thanks,
Yi.

---
v2: https://lore.kernel.org/linux-ext4/20240410034203.2188357-1-yi.zhang@huaweicloud.com/

Zhang Yi (10):
  ext4: factor out a common helper to query extent map
  ext4: check the extent status again before inserting delalloc block
  ext4: warn if delalloc counters are not zero on inactive
  ext4: trim delalloc extent
  ext4: drop iblock parameter
  ext4: make ext4_es_insert_delayed_block() insert multi-blocks
  ext4: make ext4_da_reserve_space() reserve multi-clusters
  ext4: factor out check for whether a cluster is allocated
  ext4: make ext4_insert_delayed_block() insert multi-blocks
  ext4: make ext4_da_map_blocks() buffer_head unaware

 fs/ext4/extents_status.c    |  70 +++++++---
 fs/ext4/extents_status.h    |   5 +-
 fs/ext4/inode.c             | 248 +++++++++++++++++++++++-------------
 fs/ext4/super.c             |   6 +-
 include/trace/events/ext4.h |  26 ++--
 5 files changed, 231 insertions(+), 124 deletions(-)

-- 
2.39.2