linux.git/fs/gfs2, branch v5.11

gfs2: in signal_our_withdraw wait for unfreeze of _this_ fs only

2020-12-03T16:04:41+00:00

Function signal_our_withdraw needs to work on file systems that have been
partially frozen. To do this, it called flush_workqueue(gfs2_freeze_wq).
This this wrong because it waits for *ALL* file systems to be unfrozen, not
just the one we're withdrawing from. It should only wait for the targetted
file system to be unfrozen. Otherwise it would wait until ALL file systems
are thawed before signaling the withdraw.

This patch changes signal_our_withdraw so it calls flush_work() for the target
file system's freeze work (only) to be completed.

Signed-off-by: Bob Peterson 
Signed-off-by: Andreas Gruenbacher

gfs2: Remove sb_start_write from gfs2_statfs_sync

2020-12-03T16:04:24+00:00

Before this patch, function gfs2_statfs_sync called sb_start_write and
sb_end_write. This is completely unnecessary because, aside from grabbing
glocks, gfs2_statfs_sync does all its updates to statfs with a transaction:
gfs2_trans_begin and _end. And transactions always do sb_start_intwrite in
gfs2_trans_begin and sb_end_intwrite in gfs2_trans_end.

This patch simply removes the call to sb_start_write.

Signed-off-by: Bob Peterson 
Signed-off-by: Andreas Gruenbacher

gfs2: remove trailing semicolons from macro definitions

2020-11-30T23:25:21+00:00

The macro use will already have a semicolon.

Signed-off-by: Tom Rix 
Signed-off-by: Andreas Gruenbacher

Revert "GFS2: Prevent delete work from occurring on glocks used for create"

2020-11-30T23:25:21+00:00

Since commit a0e3cc65fa29 ("gfs2: Turn gl_delete into a delayed work"), we're
cancelling any pending delete work of an iopen glock before attaching a new
inode to that glock in gfs2_create_inode.  This means that delete_work_func can
no longer be queued or running when attaching the iopen glock to the new inode,
and we can revert commit a4923865ea07 ("GFS2: Prevent delete work from
occurring on glocks used for create"), which tried to achieve the same but in a
racy way.

Signed-off-by: Andreas Gruenbacher

gfs2: Make inode operations static

2020-11-30T23:25:21+00:00

The inode operations are not used outside inode.c.

Signed-off-by: Andreas Gruenbacher

gfs2: Fix deadlock between gfs2_{create_inode,inode_lookup} and delete_work_func

2020-11-30T23:21:10+00:00

In gfs2_create_inode and gfs2_inode_lookup, make sure to cancel any pending
delete work before taking the inode glock.  Otherwise, gfs2_cancel_delete_work
may block waiting for delete_work_func to complete, and delete_work_func may
block trying to acquire the inode glock in gfs2_inode_lookup.

Reported-by: Alexander Aring 
Fixes: a0e3cc65fa29 ("gfs2: Turn gl_delete into a delayed work")
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Andreas Gruenbacher

gfs2: Upgrade shared glocks for atime updates

2020-11-26T18:58:25+00:00

Commit 20f829999c38 ("gfs2: Rework read and page fault locking") lifted
the glock lock taking from the low-level ->readpage and ->readahead
address space operations to the higher-level ->read_iter file and
->fault vm operations.  The glocks are still taken in LM_ST_SHARED mode
only.  On filesystems mounted without the noatime option, ->read_iter
sometimes needs to update the atime as well, though.  Right now, this
leads to a failed locking mode assertion in gfs2_dirty_inode.

Fix that by introducing a new update_time inode operation.  There, if
the glock is held non-exclusively, upgrade it to an exclusive lock.

Reported-by: Alexander Aring 
Fixes: 20f829999c38 ("gfs2: Rework read and page fault locking")
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Andreas Gruenbacher

gfs2: Don't freeze the file system during unmount

2020-11-25T17:12:08+00:00

GFS2's freeze/thaw mechanism uses a special freeze glock to control its
operation. It does this with a sync glock operation (glops.c) called
freeze_go_sync. When the freeze glock is demoted (glock's do_xmote) the
glops function causes the file system to be frozen. This is intended. However,
GFS2's mount and unmount processes also hold the freeze glock to prevent other
processes, perhaps on different cluster nodes, from mounting the frozen file
system in read-write mode.

Before this patch, there was no check in freeze_go_sync for whether a freeze
in intended or whether the glock demote was caused by a normal unmount.
So it was trying to freeze the file system it's trying to unmount, which
ends up in a deadlock.

This patch adds an additional check to freeze_go_sync so that demotes of the
freeze glock are ignored if they come from the unmount process.

Fixes: 20b329129009 ("gfs2: Fix regression in freeze_go_sync")
Signed-off-by: Bob Peterson 
Signed-off-by: Andreas Gruenbacher

gfs2: check for empty rgrp tree in gfs2_ri_update

2020-11-25T17:10:55+00:00

If gfs2 tries to mount a (corrupt) file system that has no resource
groups it still tries to set preferences on the first one, which causes
a kernel null pointer dereference. This patch adds a check to function
gfs2_ri_update so this condition is detected and reported back as an
error.

Reported-by: syzbot+e3f23ce40269a4c9053a@syzkaller.appspotmail.com
Signed-off-by: Bob Peterson 
Signed-off-by: Andreas Gruenbacher

gfs2: set lockdep subclass for iopen glocks

2020-11-24T22:45:58+00:00

This patch introduce a new globs attribute to define the subclass of the
glock lockref spinlock. This avoid the following lockdep warning, which
occurs when we lock an inode lock while an iopen lock is held:

============================================
WARNING: possible recursive locking detected
5.10.0-rc3+ #4990 Not tainted
--------------------------------------------
kworker/0:1/12 is trying to acquire lock:
ffff9067d45672d8 (&gl->gl_lockref.lock){+.+.}-{3:3}, at: lockref_get+0x9/0x20

but task is already holding lock:
ffff9067da308588 (&gl->gl_lockref.lock){+.+.}-{3:3}, at: delete_work_func+0x164/0x260

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&gl->gl_lockref.lock);
  lock(&gl->gl_lockref.lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by kworker/0:1/12:
 #0: ffff9067c1bfdd38 ((wq_completion)delete_workqueue){+.+.}-{0:0}, at: process_one_work+0x1b7/0x540
 #1: ffffac594006be70 ((work_completion)(&(&gl->gl_delete)->work)){+.+.}-{0:0}, at: process_one_work+0x1b7/0x540
 #2: ffff9067da308588 (&gl->gl_lockref.lock){+.+.}-{3:3}, at: delete_work_func+0x164/0x260

stack backtrace:
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.10.0-rc3+ #4990
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
Workqueue: delete_workqueue delete_work_func
Call Trace:
 dump_stack+0x8b/0xb0
 __lock_acquire.cold+0x19e/0x2e3
 lock_acquire+0x150/0x410
 ? lockref_get+0x9/0x20
 _raw_spin_lock+0x27/0x40
 ? lockref_get+0x9/0x20
 lockref_get+0x9/0x20
 delete_work_func+0x188/0x260
 process_one_work+0x237/0x540
 worker_thread+0x4d/0x3b0
 ? process_one_work+0x540/0x540
 kthread+0x127/0x140
 ? __kthread_bind_mask+0x60/0x60
 ret_from_fork+0x22/0x30

Suggested-by: Andreas Gruenbacher 
Signed-off-by: Alexander Aring 
Signed-off-by: Andreas Gruenbacher