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
aci.h
#ifndef _ACI_H_
#define _ACI_H_
#define ACI_REG_COMMAND 0 /* write register offset */
#define ACI_REG_STATUS 1 /* read register offset */
#define ACI_REG_BUSY 2 /* busy register offset */
#define ACI_REG_RDS 2 /* PCM20: RDS register offset */
#define ACI_MINTIME 500 /* ACI time out limit */
#define ACI_SET_MUTE 0x0d
#define ACI_SET_POWERAMP 0x0f
#define ACI_SET_TUNERMUTE 0xa3
#define ACI_SET_TUNERMONO 0xa4
#define ACI_SET_IDE 0xd0
#define ACI_SET_WSS 0xd1
#define ACI_SET_SOLOMODE 0xd2
#define ACI_SET_PREAMP 0x03
#define ACI_GET_PREAMP 0x21
#define ACI_WRITE_TUNE 0xa7
#define ACI_READ_TUNERSTEREO 0xa8
#define ACI_READ_TUNERSTATION 0xa9
#define ACI_READ_VERSION 0xf1
#define ACI_READ_IDCODE 0xf2
#define ACI_INIT 0xff
#define ACI_STATUS 0xf0
#define ACI_S_GENERAL 0x00
#define ACI_ERROR_OP 0xdf
/* ACI Mixer */
/* These are the values for the right channel GET registers.
Add an offset of 0x01 for the left channel register.
(left=right+0x01) */
#define ACI_GET_MASTER 0x03
#define ACI_GET_MIC 0x05
#define ACI_GET_LINE 0x07
#define ACI_GET_CD 0x09
#define ACI_GET_SYNTH 0x0b
#define ACI_GET_PCM 0x0d
#define ACI_GET_LINE1 0x10 /* Radio on PCM20 */
#define ACI_GET_LINE2 0x12
#define ACI_GET_EQ1 0x22 /* from Bass ... */
#define ACI_GET_EQ2 0x24
#define ACI_GET_EQ3 0x26
#define ACI_GET_EQ4 0x28
#define ACI_GET_EQ5 0x2a
#define ACI_GET_EQ6 0x2c
#define ACI_GET_EQ7 0x2e /* ... to Treble */
/* And these are the values for the right channel SET registers.
For left channel access you have to add an offset of 0x08.
MASTER is an exception, which needs an offset of 0x01 */
#define ACI_SET_MASTER 0x00
#define ACI_SET_MIC 0x30
#define ACI_SET_LINE 0x31
#define ACI_SET_CD 0x34
#define ACI_SET_SYNTH 0x33
#define ACI_SET_PCM 0x32
#define ACI_SET_LINE1 0x35 /* Radio on PCM20 */
#define ACI_SET_LINE2 0x36
#define ACI_SET_EQ1 0x40 /* from Bass ... */
#define ACI_SET_EQ2 0x41
#define ACI_SET_EQ3 0x42
#define ACI_SET_EQ4 0x43
#define ACI_SET_EQ5 0x44
#define ACI_SET_EQ6 0x45
#define ACI_SET_EQ7 0x46 /* ... to Treble */
struct snd_miro_aci {
unsigned long aci_port;
int aci_vendor;
int aci_product;
int aci_version;
int aci_amp;
int aci_preamp;
int aci_solomode;
struct mutex aci_mutex;
};
int snd_aci_cmd(struct snd_miro_aci *aci, int write1, int write2, int write3);
struct snd_miro_aci *snd_aci_get_aci(void);
#endif /* _ACI_H_ */
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