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23 October 2021, 00:29:24 UTC
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 
dm thin: commit metadata before creating metadata snapshot
 
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
Raw File
Tip revision: 0d200aefd4ac51787b6b80de1bb7ce93bccd59f6 authored by Joe Thornber on 03 July 2012, 11:55:31 UTC
dm thin: commit metadata before creating metadata snapshot
Tip revision: 0d200ae
wm8996.h 
/*
 * linux/sound/wm8996.h -- Platform data for WM8996
 *
 * Copyright 2011 Wolfson Microelectronics. PLC.
 *
 * 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 __LINUX_SND_WM8996_H
#define __LINUX_SND_WM8996_H

enum wm8996_inmode {
	WM8996_DIFFERRENTIAL_1 = 0,   /* IN1xP - IN1xN */
	WM8996_INVERTING = 1,         /* IN1xN */
	WM8996_NON_INVERTING = 2,     /* IN1xP */
	WM8996_DIFFERENTIAL_2 = 3,    /* IN2xP - IN2xP */
};

/**
 * ReTune Mobile configurations are specified with a label, sample
 * rate and set of values to write (the enable bits will be ignored).
 *
 * Configurations are expected to be generated using the ReTune Mobile
 * control panel in WISCE - see http://www.wolfsonmicro.com/wisce/
 */
struct wm8996_retune_mobile_config {
	const char *name;
	int rate;
	u16 regs[20];
};

#define WM8996_SET_DEFAULT 0x10000

struct wm8996_pdata {
	int irq_flags;  /** Set IRQ trigger flags; default active low */

	int ldo_ena;  /** GPIO for LDO1; -1 for none */

	int micdet_def;  /** Default MICDET_SRC/HP1FB_SRC/MICD_BIAS */

	enum wm8996_inmode inl_mode;
	enum wm8996_inmode inr_mode;

	u32 spkmute_seq;  /** Value for register 0x802 */

	int gpio_base;
	u32 gpio_default[5];

	int num_retune_mobile_cfgs;
	struct wm8996_retune_mobile_config *retune_mobile_cfgs;
};

#endif
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