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linux/fs/ocfs2
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Wengang Wang 90bd070aae ocfs2: fix deadlock between setattr and dio_end_io_write 
The following deadlock is detected:

  truncate -> setattr path is waiting for pending direct IO to be done (inode->i_dio_count become zero) with inode->i_rwsem held (down_write).

  PID: 14827  TASK: ffff881686a9af80  CPU: 20  COMMAND: "ora_p005_hrltd9"
   #0  __schedule at ffffffff818667cc
   #1  schedule at ffffffff81866de6
   #2  inode_dio_wait at ffffffff812a2d04
   #3  ocfs2_setattr at ffffffffc05f322e [ocfs2]
   #4  notify_change at ffffffff812a5a09
   #5  do_truncate at ffffffff812808f5
   #6  do_sys_ftruncate.constprop.18 at ffffffff81280cf2
   #7  sys_ftruncate at ffffffff81280d8e
   #8  do_syscall_64 at ffffffff81003949
   #9  entry_SYSCALL_64_after_hwframe at ffffffff81a001ad

dio completion path is going to complete one direct IO (decrement
inode->i_dio_count), but before that it hung at locking inode->i_rwsem:

   #0  __schedule+700 at ffffffff818667cc
   #1  schedule+54 at ffffffff81866de6
   #2  rwsem_down_write_failed+536 at ffffffff8186aa28
   #3  call_rwsem_down_write_failed+23 at ffffffff8185a1b7
   #4  down_write+45 at ffffffff81869c9d
   #5  ocfs2_dio_end_io_write+180 at ffffffffc05d5444 [ocfs2]
   #6  ocfs2_dio_end_io+85 at ffffffffc05d5a85 [ocfs2]
   #7  dio_complete+140 at ffffffff812c873c
   #8  dio_aio_complete_work+25 at ffffffff812c89f9
   #9  process_one_work+361 at ffffffff810b1889
  #10  worker_thread+77 at ffffffff810b233d
  #11  kthread+261 at ffffffff810b7fd5
  #12  ret_from_fork+62 at ffffffff81a0035e

Thus above forms ABBA deadlock.  The same deadlock was mentioned in
upstream commit 28f5a8a7c0 ("ocfs2: should wait dio before inode lock
in ocfs2_setattr()").  It seems that that commit only removed the
cluster lock (the victim of above dead lock) from the ABBA deadlock
party.

End-user visible effects: Process hang in truncate -> ocfs2_setattr path
and other processes hang at ocfs2_dio_end_io_write path.

This is to fix the deadlock itself.  It removes inode_lock() call from
dio completion path to remove the deadlock and add ip_alloc_sem lock in
setattr path to synchronize the inode modifications.

[wen.gang.wang@oracle.com: remove the "had_alloc_lock" as suggested]
  Link: https://lkml.kernel.org/r/20210402171344.1605-1-wen.gang.wang@oracle.com

Link: https://lkml.kernel.org/r/20210331203654.3911-1-wen.gang.wang@oracle.com
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-04-09 14:54:23 -07:00
..
cluster ocfs2: fix a use after free on error 2021-02-24 13:38:26 -08:00
dlm ocfs2: clean up some definitions which are not used any more 2021-02-24 13:38:26 -08:00
dlmfs fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
acl.c fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
acl.h fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
alloc.c ocfs2: fix potential soft lockup during fstrim 2020-10-13 18:38:27 -07:00
alloc.h
aops.c ocfs2: fix deadlock between setattr and dio_end_io_write 2021-04-09 14:54:23 -07:00
aops.h
blockcheck.c ocfs2: replace HTTP links with HTTPS ones 2020-08-07 11:33:22 -07:00
blockcheck.h
buffer_head_io.c
buffer_head_io.h
dcache.c
dcache.h
dir.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
dir.h
dlmglue.c ocfs2: fix unbalanced locking 2020-08-07 11:33:22 -07:00
dlmglue.h
export.c
export.h
extent_map.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
extent_map.h
file.c ocfs2: fix deadlock between setattr and dio_end_io_write 2021-04-09 14:54:23 -07:00
file.h fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
filecheck.c
filecheck.h
heartbeat.c
heartbeat.h
inode.c
inode.h
ioctl.c inode: make init and permission helpers idmapped mount aware 2021-01-24 14:27:16 +01:00
ioctl.h
journal.c jbd2: rename j_maxlen to j_total_len and add jbd2_journal_max_txn_bufs 2020-11-06 23:01:02 -05:00
journal.h
Kconfig ocfs2: replace HTTP links with HTTPS ones 2020-08-07 11:33:22 -07:00
localalloc.c ocfs2: delete repeated words in comments 2020-10-13 18:38:27 -07:00
localalloc.h
locks.c
locks.h
Makefile
mmap.c ocfs2: fix spelling mistake and grammar 2020-06-10 19:14:18 -07:00
mmap.h
move_extents.c
move_extents.h
namei.c fs: make helpers idmap mount aware 2021-01-24 14:27:20 +01:00
namei.h
ocfs1_fs_compat.h
ocfs2.h ocfs2: change slot number type s16 to u16 2020-08-07 11:33:21 -07:00
ocfs2_fs.h ocfs2: fix value of OCFS2_INVALID_SLOT 2020-06-26 00:27:37 -07:00
ocfs2_ioctl.h
ocfs2_lockid.h
ocfs2_lockingver.h
ocfs2_trace.h
quota.h
quota_global.c
quota_local.c
refcounttree.c ocfs2: simplify the calculation of variables 2021-02-24 13:38:26 -08:00
refcounttree.h
reservations.c
reservations.h
resize.c
resize.h
slot_map.c ocfs2: mount shared volume without ha stack 2020-06-02 10:59:05 -07:00
slot_map.h
stack_o2cb.c
stack_user.c
stackglue.c
stackglue.h
suballoc.c ocfs2: change slot number type s16 to u16 2020-08-07 11:33:21 -07:00
suballoc.h ocfs2: suballoc.h: delete a duplicated word 2020-08-07 11:33:21 -07:00
super.c ocfs2: remove redundant conditional before iput 2021-02-24 13:38:26 -08:00
super.h
symlink.c
symlink.h
sysfile.c
sysfile.h
uptodate.c
uptodate.h
xattr.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr.h