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linux-kernel@vger.kernel.org, mcgrof@kernel.org, hch@infradead.org, david@fromorbit.com, djwong@kernel.org, pavel@kernel.org, peterz@infradead.org, mingo@redhat.com, will@kernel.org, boqun.feng@gmail.com Date: Tue, 08 Apr 2025 11:43:46 -0400 In-Reply-To: <20250402-radstand-neufahrzeuge-198b40c2d073@brauner> References: <20250331-work-freeze-v1-0-6dfbe8253b9f@kernel.org> <20250401-work-freeze-v1-0-d000611d4ab0@kernel.org> <20250402-radstand-neufahrzeuge-198b40c2d073@brauner> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-04-02 at 09:46 +0200, Christian Brauner wrote: > On Tue, Apr 01, 2025 at 01:02:07PM -0400, James Bottomley wrote: > > On Tue, 2025-04-01 at 02:32 +0200, Christian Brauner wrote: > > > The whole shebang can also be found at: > > > https://web.git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?= h=3Dwork.freeze > > >=20 > > > I know nothing about power or hibernation. I've tested it as best > > > as I could. Works for me (TM). > >=20 > > I'm testing the latest you have in work.freeze and it doesn't > > currently work for me.=C2=A0 Patch 7b315c39b67d ("power: freeze > > filesystems during suspend/resume") doesn't set > > filesystems_freeze_ptr so it ends up being NULL and tripping over > > this check=20 >=20 > I haven't pushed the new version there. Sorry about that. I only have > it locally. >=20 > >=20 > > +static inline bool may_unfreeze(struct super_block *sb, enum > > freeze_holder who, > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 const void *freeze_owner) > > +{ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 WARN_ON_ONCE((who & ~FREEZE_FLAGS= )); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 WARN_ON_ONCE(hweight32(who & FREE= ZE_HOLDERS) > 1); > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (who & FREEZE_EXCL) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 if (WARN_ON_ONCE(sb->s_writers.freeze_owner =3D=3D > > NULL)) > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return fals= e; > >=20 > >=20 > > in f15a9ae05a71 ("fs: add owner of freeze/thaw") and failing to > > resume from hibernate.=C2=A0 Setting it to __builtin_return_address(0) > > in filesystems_freeze() makes everything work as expected, so > > that's what I'm testing now. >=20 > +1 >=20 > I'll send the final version out in a bit. I've now done some extensive testing on loop nested filesystems with fio load on the upper. I've tried xfs on ext4 and ext4 on ext4. Hibernate/Resume has currently worked on these without a hitch (and the fio load burps a bit but then starts running at full speed within a few seconds). What I'm doing is a single round of hibernate/resume followed by a reboot. I'm relying on the fschecks to detect any filesystem corruption. I've also tried doing a couple of fresh starts of the hibernated image to check that we did correctly freeze the filesystems. The problems I've noticed are: 1. I'm using 9p to push host directories throught and that completely hangs after a resume. This is expected because the virtio server is out of sync, but it does indicate a need to address Jeff's question of what we should be doing for network filesystems (and is also the reason I have to reboot after resuming). 2. Top doesn't show any CPU activity after resume even though fio is definitely running. =C2=A0This seems to be a suspend issue and unrelated to filesystems, but I'll continue investigating. Regards, James