https://github.com/torvalds/linux
Revision 0d200aefd4ac51787b6b80de1bb7ce93bccd59f6 authored by Joe Thornber on 03 July 2012, 11:55:31 UTC, committed by Alasdair G Kergon on 03 July 2012, 11:55:31 UTC
Userland sometimes sees a corrupt metadata block if metadata is changing
rapidly when a metadata snapshot is reserved for userland, To make the
problem go away, commit before we take the metadata snapshot (which is a
sensible thing to do anyway).
The checksums mean userland spots this corruption immediately so there's
no risk of acting on incorrect data. No corruption exists from the
kernel's point of view, and thin_check passes after pool shutdown.
I believe this is to do with shared blocks at the first level of the
{device, mapping} btree. Prior to the metadata-snap support no sharing
at this level was possible, so this patch is only required after commit
cc8394d86f045b86ff303d3c9e4ce47d97148951 ("dm thin: provide userspace
access to pool metadata").
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
1 parent 6887a41
Tip revision: 0d200aefd4ac51787b6b80de1bb7ce93bccd59f6 authored by Joe Thornber on 03 July 2012, 11:55:31 UTC
dm thin: commit metadata before creating metadata snapshot
dm thin: commit metadata before creating metadata snapshot
Tip revision: 0d200ae
cs42l52.h
/*
* linux/sound/cs42l52.h -- Platform data for CS42L52
*
* Copyright (c) 2012 Cirrus Logic Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __CS42L52_H
#define __CS42L52_H
struct cs42l52_platform_data {
/* MICBIAS Level. Check datasheet Pg48 */
unsigned int micbias_lvl;
/* MICA mode selection 0=Single 1=Differential */
unsigned int mica_cfg;
/* MICB mode selection 0=Single 1=Differential */
unsigned int micb_cfg;
/* MICA Select 0=MIC1A 1=MIC2A */
unsigned int mica_sel;
/* MICB Select 0=MIC2A 1=MIC2B */
unsigned int micb_sel;
/* Charge Pump Freq. Check datasheet Pg73 */
unsigned int chgfreq;
};
#endif /* __CS42L52_H */
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