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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
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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
sh_fsi.h 
#ifndef __SOUND_FSI_H
#define __SOUND_FSI_H

/*
 * Fifo-attached Serial Interface (FSI) support for SH7724
 *
 * Copyright (C) 2009 Renesas Solutions Corp.
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * 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.
 */

#define FSI_PORT_A	0
#define FSI_PORT_B	1

#include <linux/clk.h>
#include <sound/soc.h>

/*
 * flags format
 *
 * 0x00000CBA
 *
 * A:  inversion
 * B:  format mode
 * C:  chip specific
 */

/* A: clock inversion */
#define SH_FSI_INVERSION_MASK	0x0000000F
#define SH_FSI_LRM_INV		(1 << 0)
#define SH_FSI_BRM_INV		(1 << 1)
#define SH_FSI_LRS_INV		(1 << 2)
#define SH_FSI_BRS_INV		(1 << 3)

/* B: format mode */
#define SH_FSI_FMT_MASK		0x000000F0
#define SH_FSI_FMT_DAI		(0 << 4)
#define SH_FSI_FMT_SPDIF	(1 << 4)

/* C: chip specific */
#define SH_FSI_OPTION_MASK	0x00000F00
#define SH_FSI_ENABLE_STREAM_MODE	(1 << 8) /* for 16bit data */

/*
 * set_rate return value
 *
 * see ACKMD/BPFMD on
 *     ACK_MD (FSI2)
 *     CKG1   (FSI)
 *
 * err		: return value <  0
 * no change	: return value == 0
 * change xMD	: return value >  0
 *
 * 0x-00000AB
 *
 * A:  ACKMD value
 * B:  BPFMD value
 */

#define SH_FSI_ACKMD_MASK	(0xF << 0)
#define SH_FSI_ACKMD_512	(1 << 0)
#define SH_FSI_ACKMD_256	(2 << 0)
#define SH_FSI_ACKMD_128	(3 << 0)
#define SH_FSI_ACKMD_64		(4 << 0)
#define SH_FSI_ACKMD_32		(5 << 0)

#define SH_FSI_BPFMD_MASK	(0xF << 4)
#define SH_FSI_BPFMD_512	(1 << 4)
#define SH_FSI_BPFMD_256	(2 << 4)
#define SH_FSI_BPFMD_128	(3 << 4)
#define SH_FSI_BPFMD_64		(4 << 4)
#define SH_FSI_BPFMD_32		(5 << 4)
#define SH_FSI_BPFMD_16		(6 << 4)

struct sh_fsi_port_info {
	unsigned long flags;
	int tx_id;
	int rx_id;
	int (*set_rate)(struct device *dev, int rate, int enable);
};

struct sh_fsi_platform_info {
	struct sh_fsi_port_info port_a;
	struct sh_fsi_port_info port_b;
};

#endif /* __SOUND_FSI_H */
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