This patchset avoids transaction reservation recursion by reintroducing
the discarded PF_FSTRANS in a new way, suggested by Dave. In this new
implementation, some new helpers are introduced, which are
xfs_trans_context_{set, clear, active},
suggested by Dave. And re-using the task->journal_info to indicates
whehter the task is in fstrans or not, suggested by Willy
Darrick helped fix the error occurred in xfs/141.[2]
I rerun the xfstests again in my server, and no obvious error occurred.
Patch #1 is picked from Willy's patchset "Overhaul memalloc_no*"[1]
[1].
https://lore.kernel.org/linux-mm/20200625113122.7540-1-willy@xxxxxxxxxxxxx/
[2]. https://lore.kernel.org/linux-xfs/20201104001649.GN7123@magnolia/#t
v9:
- rebase it on xfs tree.
- Darrick fixed an error occurred in xfs/141
- run xfstests, and no obvious error occurred.
v8:
- check xfs_trans_context_active() in xfs_vm_writepage(s), per Dave.
v7:
- check fstrans recursion for XFS only, by introducing a new member in
struct writeback_control.
v6:
- add Michal's ack and comment in patch #1.
v5:
- pick one of Willy's patch
- introduce four new helpers, per Dave
v4:
- retitle from "xfs: introduce task->in_fstrans for transaction reservation
recursion protection"
- reuse current->journal_info, per Willy
Matthew Wilcox (Oracle) (1):
mm: Add become_kswapd and restore_kswapd
Yafang Shao (1):
xfs: avoid transaction reservation recursion
fs/iomap/buffered-io.c | 7 -------
fs/xfs/libxfs/xfs_btree.c | 14 ++++++++------
fs/xfs/xfs_aops.c | 23 +++++++++++++++++++++--
fs/xfs/xfs_linux.h | 4 ----
fs/xfs/xfs_trans.c | 25 +++++++++++++------------
fs/xfs/xfs_trans.h | 23 +++++++++++++++++++++++
include/linux/sched/mm.h | 23 +++++++++++++++++++++++
mm/vmscan.c | 16 +---------------
8 files changed, 89 insertions(+), 46 deletions(-)
--
2.18.4
