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From: "Darrick J. Wong" <>
Cc: Christoph Hellwig <>, Brian Foster <>,,,,
Subject: [PATCHSET v5 00/11] xfs: try harder to reclaim space when we run out
Date: Wed, 27 Jan 2021 22:02:20 -0800
Message-ID: <161181374062.1525026.14717838769921652940.stgit@magnolia> (raw)

Hi all,

Historically, when users ran out of space or quota when trying to write
to the filesystem, XFS didn't try very hard to reclaim space that it
might have speculatively allocated for the purpose of speeding up
front-end filesystem operations (appending writes, cow staging).  The
upcoming deferred inactivation series will greatly increase the amount
of allocated space that isn't actively being used to store user data.

Therefore, try to reduce the circumstances where we return EDQUOT or
ENOSPC to userspace by teaching the write paths to try to clear space
and retry the operation one time before giving up.

Previous iterations of this patchset made massive changes to the
codebase, but thanks to the transaction allocation helpers that Brian
pushed for (in the previous patchset) this is mostly no longer
necessary. :)

v2: clean up and rebase against 5.11.
v3: restructure the retry loops per dchinner suggestion
v4: simplify the calling convention of xfs_trans_reserve_quota_nblks
v5: constrain the open-coded 'goto retry' loops to the hlepers created
    in the previous patchset

If you're going to start using this mess, you probably ought to just
pull from my git trees, which are linked below.

This is an extraordinary way to destroy everything.  Enjoy!
Comments and questions are, as always, welcome.


kernel git tree:
 fs/xfs/xfs_file.c        |   24 +++---
 fs/xfs/xfs_icache.c      |  184 ++++++++++++++++++++++++++++++----------------
 fs/xfs/xfs_icache.h      |    7 +-
 fs/xfs/xfs_ioctl.c       |   11 +++
 fs/xfs/xfs_iops.c        |   10 ++-
 fs/xfs/xfs_quota.h       |   51 +++++++++++--
 fs/xfs/xfs_reflink.c     |    7 ++
 fs/xfs/xfs_trace.c       |    1 
 fs/xfs/xfs_trace.h       |   42 +++++++++++
 fs/xfs/xfs_trans.c       |   31 +++++++-
 fs/xfs/xfs_trans_dquot.c |  169 +++++++++++++++++++++++++++++++++++++++---
 11 files changed, 433 insertions(+), 104 deletions(-)

             reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-28  6:02 Darrick J. Wong [this message]
2021-01-28  6:02 ` [PATCH 01/11] xfs: trigger all block gc scans when low on quota space Darrick J. Wong
2021-01-28  6:02 ` [PATCH 02/11] xfs: don't stall cowblocks scan if we can't take locks Darrick J. Wong
2021-01-28  6:02 ` [PATCH 03/11] xfs: xfs_inode_free_quota_blocks should scan project quota Darrick J. Wong
2021-01-28  6:02 ` [PATCH 04/11] xfs: move and rename xfs_inode_free_quota_blocks to avoid conflicts Darrick J. Wong
2021-01-28  6:02 ` [PATCH 05/11] xfs: pass flags and return gc errors from xfs_blockgc_free_quota Darrick J. Wong
2021-01-28  6:02 ` [PATCH 06/11] xfs: flush eof/cowblocks if we can't reserve quota for file blocks Darrick J. Wong
2021-01-28  9:26   ` Christoph Hellwig
2021-01-28  6:03 ` [PATCH 07/11] xfs: flush eof/cowblocks if we can't reserve quota for inode creation Darrick J. Wong
2021-01-28  6:03 ` [PATCH 08/11] xfs: flush eof/cowblocks if we can't reserve quota for chown Darrick J. Wong
2021-01-28  6:03 ` [PATCH 09/11] xfs: add a tracepoint for blockgc scans Darrick J. Wong
2021-01-28  6:03 ` [PATCH 10/11] xfs: refactor xfs_icache_free_{eof,cow}blocks call sites Darrick J. Wong
2021-01-28  6:03 ` [PATCH 11/11] xfs: flush speculative space allocations when we run out of space Darrick J. Wong
2021-01-28  9:26   ` Christoph Hellwig

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