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(-)
--
2.11.0
