ext4: mark more ops fast-commit ineligible

[RFC 0/5] ext4: mark more ops fast-commit ineligible

Posted by Li Chen 1 month, 4 weeks ago

ext4 fast commit only logs operations with replay support. This series
marks a few more operations as fast-commit ineligible and accounts
them via fc_info so behaviour under fast commit is easier to reason
about.

Testing was done in a QEMU guest on loopback ext4 filesystems created
with -O fast_commit[/,verity] by exercising each operation and checking
/proc/fs/ext4/*/fc_info for the corresponding ineligible reason and
ineligible commit counters. Detailed steps are in each commit's message.

Li Chen (5):
  ext4: mark inode format migration fast-commit ineligible
  ext4: mark fs-verity enable fast-commit ineligible
  ext4: mark move extents fast-commit ineligible
  ext4: mark group add fast-commit ineligible
  ext4: mark group extend fast-commit ineligible

 fs/ext4/fast_commit.c       |  3 +++
 fs/ext4/fast_commit.h       |  3 +++
 fs/ext4/ioctl.c             |  3 +++
 fs/ext4/migrate.c           | 12 ++++++++++++
 fs/ext4/move_extent.c       |  1 +
 fs/ext4/verity.c            |  2 ++
 include/trace/events/ext4.h |  8 +++++++-
 7 files changed, 31 insertions(+), 1 deletion(-)

-- 
2.51.0

Re: [RFC 0/5] ext4: mark more ops fast-commit ineligible

Posted by Theodore Ts'o 1 week, 2 days ago

On Thu, 11 Dec 2025 19:51:37 +0800, Li Chen wrote:
> ext4 fast commit only logs operations with replay support. This series
> marks a few more operations as fast-commit ineligible and accounts
> them via fc_info so behaviour under fast commit is easier to reason
> about.
> 
> Testing was done in a QEMU guest on loopback ext4 filesystems created
> with -O fast_commit[/,verity] by exercising each operation and checking
> /proc/fs/ext4/*/fc_info for the corresponding ineligible reason and
> ineligible commit counters. Detailed steps are in each commit's message.
> 
> [...]

Applied, thanks!

[1/5] ext4: mark inode format migration fast-commit ineligible
      commit: 87e79fa122bc9a6576f1690ee264fcbd77d3ab58
[2/5] ext4: mark fs-verity enable fast-commit ineligible
      commit: 16d43b9748c655b36a675cc55789f40fd827e9b1
[3/5] ext4: mark move extents fast-commit ineligible
      commit: 690558921d9f9388c6bc83610451d8cb393e4d88
[4/5] ext4: mark group add fast-commit ineligible
      commit: 89b4336fd5ec78f51f9d3a1d100f3ffa3228e604
[5/5] ext4: mark group extend fast-commit ineligible
      commit: 1f8dd813a1c771b13c303f73d876164bc9b327cc

Best regards,
-- 
Theodore Ts'o <tytso@mit.edu>