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
max98095.h
/*
* Platform data for MAX98095
*
* Copyright 2011 Maxim Integrated Products
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#ifndef __SOUND_MAX98095_PDATA_H__
#define __SOUND_MAX98095_PDATA_H__
/* Equalizer filter response configuration */
struct max98095_eq_cfg {
const char *name;
unsigned int rate;
u16 band1[5];
u16 band2[5];
u16 band3[5];
u16 band4[5];
u16 band5[5];
};
/* Biquad filter response configuration */
struct max98095_biquad_cfg {
const char *name;
unsigned int rate;
u16 band1[5];
u16 band2[5];
};
/* codec platform data */
struct max98095_pdata {
/* Equalizers for DAI1 and DAI2 */
struct max98095_eq_cfg *eq_cfg;
unsigned int eq_cfgcnt;
/* Biquad filter for DAI1 and DAI2 */
struct max98095_biquad_cfg *bq_cfg;
unsigned int bq_cfgcnt;
/* Analog/digital microphone configuration:
* 0 = analog microphone input (normal setting)
* 1 = digital microphone input
*/
unsigned int digmic_left_mode:1;
unsigned int digmic_right_mode:1;
/* Pin5 is the mechanical method of sensing jack insertion
* but it is something that might not be supported.
* 0 = PIN5 not supported
* 1 = PIN5 supported
*/
unsigned int jack_detect_pin5en:1;
/* Slew amount for jack detection. Calculated as 4 * (delay + 1).
* Default delay is 24 to get a time of 100ms.
*/
unsigned int jack_detect_delay;
};
#endif
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