Revision 3e1a0699095803e53072699a4a1485af7744601d authored by Joe Thornber on 03 March 2014, 16:03:26 UTC, committed by Mike Snitzer on 05 March 2014, 20:26:58 UTC
Ideally a thin pool would never run out of data space; the low water mark would trigger userland to extend the pool before we completely run out of space. However, many small random IOs to unprovisioned space can consume data space at an alarming rate. Adjust your low water mark if you're frequently seeing "out-of-data-space" mode. Before this fix, if data space ran out the pool would be put in PM_READ_ONLY mode which also aborted the pool's current metadata transaction (data loss for any changes in the transaction). This had a side-effect of needlessly compromising data consistency. And retry of queued unserviceable bios, once the data pool was resized, could initiate changes to potentially inconsistent pool metadata. Now when the pool's data space is exhausted transition to a new pool mode (PM_OUT_OF_DATA_SPACE) that allows metadata to be changed but data may not be allocated. This allows users to remove thin volumes or discard data to recover data space. The pool is no longer put in PM_READ_ONLY mode in response to the pool running out of data space. And PM_READ_ONLY mode no longer aborts the pool's current metadata transaction. Also, set_pool_mode() will now notify userspace when the pool mode is changed. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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ultrastor.h
/*
* ultrastor.c (C) 1991 David B. Gentzel
* Low-level scsi driver for UltraStor 14F
* by David B. Gentzel, Whitfield Software Services, Carnegie, PA
* (gentzel@nova.enet.dec.com)
* scatter/gather added by Scott Taylor (n217cg@tamuts.tamu.edu)
* 24F support by John F. Carr (jfc@athena.mit.edu)
* John's work modified by Caleb Epstein (cae@jpmorgan.com) and
* Eric Youngdale (eric@tantalus.nrl.navy.mil).
* Thanks to UltraStor for providing the necessary documentation
*/
#ifndef _ULTRASTOR_H
#define _ULTRASTOR_H
static int ultrastor_detect(struct scsi_host_template *);
static const char *ultrastor_info(struct Scsi_Host *shpnt);
static int ultrastor_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
static int ultrastor_abort(struct scsi_cmnd *);
static int ultrastor_host_reset(struct scsi_cmnd *);
static int ultrastor_biosparam(struct scsi_device *, struct block_device *,
sector_t, int *);
#define ULTRASTOR_14F_MAX_SG 16
#define ULTRASTOR_24F_MAX_SG 33
#define ULTRASTOR_MAX_CMDS_PER_LUN 5
#define ULTRASTOR_MAX_CMDS 16
#define ULTRASTOR_24F_PORT 0xC80
#ifdef ULTRASTOR_PRIVATE
#define UD_ABORT 0x0001
#define UD_COMMAND 0x0002
#define UD_DETECT 0x0004
#define UD_INTERRUPT 0x0008
#define UD_RESET 0x0010
#define UD_MULTI_CMD 0x0020
#define UD_CSIR 0x0040
#define UD_ERROR 0x0080
/* #define PORT_OVERRIDE 0x330 */
/* Values for the PRODUCT_ID ports for the 14F */
#define US14F_PRODUCT_ID_0 0x56
#define US14F_PRODUCT_ID_1 0x40 /* NOTE: Only upper nibble is used */
#define US24F_PRODUCT_ID_0 0x56
#define US24F_PRODUCT_ID_1 0x63
#define US24F_PRODUCT_ID_2 0x02
/* Subversion values */
#define U14F 0
#define U34F 1
/* MSCP field values */
/* Opcode */
#define OP_HOST_ADAPTER 0x1
#define OP_SCSI 0x2
#define OP_RESET 0x4
/* Date Transfer Direction */
#define DTD_SCSI 0x0
#define DTD_IN 0x1
#define DTD_OUT 0x2
#define DTD_NONE 0x3
/* Host Adapter command subcodes */
#define HA_CMD_INQUIRY 0x1
#define HA_CMD_SELF_DIAG 0x2
#define HA_CMD_READ_BUFF 0x3
#define HA_CMD_WRITE_BUFF 0x4
#endif
#endif
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