Re: [PATCH] Freeze bdevs when freezing processes.
- From: Nigel Cunningham <ncunningham@xxxxxxxxxxxxx>
- Date: Wed, 25 Oct 2006 23:23:40 +1000
Hi.
On Wed, 2006-10-25 at 14:32 +0200, Rafael J. Wysocki wrote:
On Wednesday, 25 October 2006 10:47, Pavel Machek wrote:
On Wed 2006-10-25 18:38:30, David Chinner wrote:
On Wed, Oct 25, 2006 at 10:10:01AM +0200, Pavel Machek wrote:
Hence the only way to correctly rebuild the XFS state on resume is
to quiesce the filesystem on suspend and thaw it on resume so as to
trigger log recovery.
No, during suspend/resume, memory image is saved, and no state is
lost. We would not even have to do sys_sync(), and suspend/resume
would still work properly.
It seems to me that you ensure the filesystem is synced to disk and
then at some point later you record the memory state of the
filesystem, but these happen at different times. That leaves a
window for things to get out of sync again, right?
I DO NOT HAVE TO ENSURE FILESYSTEM IS SYNCED. That sys_sync() is
optional.
Recording of memory state is atomic, and as long as noone writes to
the disk after atomic snapshot, memory image matches what is on disk.
Well, my impression is that this is exactly what happens here: Something
in the XFS code causes metadata to be written to disk _after_ the atomic
snapshot.
That's why I asked if the dirty XFS metadata were flushed by a kernel thread.
When I first added bdev freezing it was because there was an XFS timer
doing writes.
Regards,
Nigel
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
- Follow-Ups:
- Re: [PATCH] Freeze bdevs when freezing processes.
- From: Rafael J. Wysocki
- Re: [PATCH] Freeze bdevs when freezing processes.
- References:
- [PATCH] Freeze bdevs when freezing processes.
- From: Nigel Cunningham
- Re: [PATCH] Freeze bdevs when freezing processes.
- From: David Chinner
- Re: [PATCH] Freeze bdevs when freezing processes.
- From: Pavel Machek
- Re: [PATCH] Freeze bdevs when freezing processes.
- From: Rafael J. Wysocki
- [PATCH] Freeze bdevs when freezing processes.
- Prev by Date: Re: [KJ][PATCH] Correct misc_register return code handling in several drivers
- Next by Date: sexuaally expllicit:Youngg pick Bitch Porrn unsurpassable Viddeo!
- Previous by thread: Re: [PATCH] Freeze bdevs when freezing processes.
- Next by thread: Re: [PATCH] Freeze bdevs when freezing processes.
- Index(es):
Relevant Pages
|
