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[RFC,0/6] ext4: rework bigalloc reserved cluster accounting

Message ID 20180823022707.14593-1-enwlinux@gmail.com
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Series ext4: rework bigalloc reserved cluster accounting | expand

Message

Eric Whitney Aug. 23, 2018, 2:27 a.m. UTC 
Ext4 can make gross overestimates of the number of reserved clusters
required to handle bigalloc write requests under delayed allocation,
resulting in premature ENOSPC and quota limit failures.

These patches fix the implementation of reserved cluster accounting for
bigalloc file systems configured to use delayed allocation, and fix the
specific bugs described in bugzilla #151491.

These patches also supersede a previous RFC posting from May 2018
("ext4: rework delayed allocated cluster accounting").

Eric Whitney (6):
  ext4: generalize extents status tree search functions
  ext4: add new pending reservation mechanism
  ext4: fix reserved cluster accounting at delayed write time
  ext4: reduce reserved cluster count by number of allocated clusters
  ext4: adjust reserved cluster count when removing extents
  ext4: fix reserved cluster accounting at page invalidation time

 fs/ext4/ext4.h              |  10 +-
 fs/ext4/ext4_extents.h      |  13 +
 fs/ext4/extents.c           | 602 ++++++++++++++++++++--------------------
 fs/ext4/extents_status.c    | 662 ++++++++++++++++++++++++++++++++++++++++++--
 fs/ext4/extents_status.h    |  85 +++++-
 fs/ext4/inode.c             | 104 ++++---
 fs/ext4/mballoc.c           |  14 +-
 fs/ext4/super.c             |   8 +
 include/trace/events/ext4.h |  99 +++++--
 9 files changed, 1199 insertions(+), 398 deletions(-)