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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
wm8962.h 
/*
 * wm8962.h  --  WM8962 Soc Audio driver platform data
 *
 * 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 _WM8962_PDATA_H
#define _WM8962_PDATA_H

#define WM8962_MAX_GPIO 6

/* Use to set GPIO default values to zero */
#define WM8962_GPIO_SET 0x10000

#define WM8962_GPIO_FN_CLKOUT           0
#define WM8962_GPIO_FN_LOGIC            1
#define WM8962_GPIO_FN_SDOUT            2
#define WM8962_GPIO_FN_IRQ              3
#define WM8962_GPIO_FN_THERMAL          4
#define WM8962_GPIO_FN_PLL2_LOCK        6
#define WM8962_GPIO_FN_PLL3_LOCK        7
#define WM8962_GPIO_FN_FLL_LOCK         9
#define WM8962_GPIO_FN_DRC_ACT         10
#define WM8962_GPIO_FN_WSEQ_DONE       11
#define WM8962_GPIO_FN_ALC_NG_ACT      12
#define WM8962_GPIO_FN_ALC_PEAK_LIMIT  13
#define WM8962_GPIO_FN_ALC_SATURATION  14
#define WM8962_GPIO_FN_ALC_LEVEL_THR   15
#define WM8962_GPIO_FN_ALC_LEVEL_LOCK  16
#define WM8962_GPIO_FN_FIFO_ERR        17
#define WM8962_GPIO_FN_OPCLK           18
#define WM8962_GPIO_FN_DMICCLK         19
#define WM8962_GPIO_FN_DMICDAT         20
#define WM8962_GPIO_FN_MICD            21
#define WM8962_GPIO_FN_MICSCD          22

struct wm8962_pdata {
	int gpio_base;
	u32 gpio_init[WM8962_MAX_GPIO];

	/* Setup for microphone detection, raw value to be written to
	 * R48(0x30) - only microphone related bits will be updated.
	 * Detection may be enabled here for use with signals brought
	 * out on the GPIOs. */
	u32 mic_cfg;

	bool irq_active_low;

	bool spk_mono;   /* Speaker outputs tied together as mono */

	/**
	 * This flag should be set if one or both IN4 inputs is wired
	 * in a DC measurement configuration.
	 */
	bool in4_dc_measure;
};

#endif
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