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>
1 parent 07f2b6e
t128.c
#define AUTOSENSE
#define PSEUDO_DMA
/*
* Trantor T128/T128F/T228 driver
* Note : architecturally, the T100 and T130 are different and won't
* work
*
* Copyright 1993, Drew Eckhardt
* Visionary Computing
* (Unix and Linux consulting and custom programming)
* drew@colorado.edu
* +1 (303) 440-4894
*
* DISTRIBUTION RELEASE 3.
*
* For more information, please consult
*
* Trantor Systems, Ltd.
* T128/T128F/T228 SCSI Host Adapter
* Hardware Specifications
*
* Trantor Systems, Ltd.
* 5415 Randall Place
* Fremont, CA 94538
* 1+ (415) 770-1400, FAX 1+ (415) 770-9910
*
* and
*
* NCR 5380 Family
* SCSI Protocol Controller
* Databook
*
* NCR Microelectronics
* 1635 Aeroplaza Drive
* Colorado Springs, CO 80916
* 1+ (719) 578-3400
* 1+ (800) 334-5454
*/
/*
* Options :
* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
* for commands that return with a CHECK CONDITION status.
*
* PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
* increase compared to polled I/O.
*
* PARITY - enable parity checking. Not supported.
*
* SCSI2 - enable support for SCSI-II tagged queueing. Untested.
*
*
* UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
* only really want to use this if you're having a problem with
* dropped characters during high speed communications, and even
* then, you're going to be better off twiddling with transfersize.
*
* USLEEP - enable support for devices that don't disconnect. Untested.
*
* The card is detected and initialized in one of several ways :
* 1. Autoprobe (default) - since the board is memory mapped,
* a BIOS signature is scanned for to locate the registers.
* An interrupt is triggered to autoprobe for the interrupt
* line.
*
* 2. With command line overrides - t128=address,irq may be
* used on the LILO command line to override the defaults.
*
* 3. With the T128_OVERRIDE compile time define. This is
* specified as an array of address, irq tuples. Ie, for
* one board at the default 0xcc000 address, IRQ5, I could say
* -DT128_OVERRIDE={{0xcc000, 5}}
*
* Note that if the override methods are used, place holders must
* be specified for other boards in the system.
*
* T128/T128F jumper/dipswitch settings (note : on my sample, the switches
* were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
*
* T128 Sw7 Sw8 Sw6 = 0ws Sw5 = boot
* T128F Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
* cc000 off off
* c8000 off on
* dc000 on off
* d8000 on on
*
*
* Interrupts
* There is a 12 pin jumper block, jp1, numbered as follows :
* T128 (JP1) T128F (J5)
* 2 4 6 8 10 12 11 9 7 5 3 1
* 1 3 5 7 9 11 12 10 8 6 4 2
*
* 3 2-4
* 5 1-3
* 7 3-5
* T128F only
* 10 8-10
* 12 7-9
* 14 10-12
* 15 9-11
*/
/*
* $Log: t128.c,v $
*/
#include <linux/signal.h>
#include <linux/io.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "t128.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"
static struct override {
unsigned long address;
int irq;
} overrides
#ifdef T128_OVERRIDE
[] __initdata = T128_OVERRIDE;
#else
[4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
{0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
#endif
#define NO_OVERRIDES ARRAY_SIZE(overrides)
static struct base {
unsigned int address;
int noauto;
} bases[] __initdata = {
{ 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
};
#define NO_BASES ARRAY_SIZE(bases)
static struct signature {
const char *string;
int offset;
} signatures[] __initdata = {
{"TSROM: SCSI BIOS, Version 1.12", 0x36},
};
#define NO_SIGNATURES ARRAY_SIZE(signatures)
/*
* Function : t128_setup(char *str, int *ints)
*
* Purpose : LILO command line initialization of the overrides array,
*
* Inputs : str - unused, ints - array of integer parameters with ints[0]
* equal to the number of ints.
*
*/
void __init t128_setup(char *str, int *ints){
static int commandline_current = 0;
int i;
if (ints[0] != 2)
printk("t128_setup : usage t128=address,irq\n");
else
if (commandline_current < NO_OVERRIDES) {
overrides[commandline_current].address = ints[1];
overrides[commandline_current].irq = ints[2];
for (i = 0; i < NO_BASES; ++i)
if (bases[i].address == ints[1]) {
bases[i].noauto = 1;
break;
}
++commandline_current;
}
}
/*
* Function : int t128_detect(struct scsi_host_template * tpnt)
*
* Purpose : detects and initializes T128,T128F, or T228 controllers
* that were autoprobed, overridden on the LILO command line,
* or specified at compile time.
*
* Inputs : tpnt - template for this SCSI adapter.
*
* Returns : 1 if a host adapter was found, 0 if not.
*
*/
int __init t128_detect(struct scsi_host_template * tpnt){
static int current_override = 0, current_base = 0;
struct Scsi_Host *instance;
unsigned long base;
void __iomem *p;
int sig, count;
tpnt->proc_name = "t128";
tpnt->show_info = t128_show_info;
tpnt->write_info = t128_write_info;
for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
base = 0;
p = NULL;
if (overrides[current_override].address) {
base = overrides[current_override].address;
p = ioremap(bases[current_base].address, 0x2000);
if (!p)
base = 0;
} else
for (; !base && (current_base < NO_BASES); ++current_base) {
#if (TDEBUG & TDEBUG_INIT)
printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
#endif
if (bases[current_base].noauto)
continue;
p = ioremap(bases[current_base].address, 0x2000);
if (!p)
continue;
for (sig = 0; sig < NO_SIGNATURES; ++sig)
if (check_signature(p + signatures[sig].offset,
signatures[sig].string,
strlen(signatures[sig].string))) {
base = bases[current_base].address;
#if (TDEBUG & TDEBUG_INIT)
printk("scsi-t128 : detected board.\n");
#endif
goto found;
}
iounmap(p);
}
#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
printk("scsi-t128 : base = %08x\n", (unsigned int) base);
#endif
if (!base)
break;
found:
instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
if(instance == NULL)
break;
instance->base = base;
((struct NCR5380_hostdata *)instance->hostdata)->base = p;
NCR5380_init(instance, 0);
if (overrides[current_override].irq != IRQ_AUTO)
instance->irq = overrides[current_override].irq;
else
instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
if (instance->irq != SCSI_IRQ_NONE)
if (request_irq(instance->irq, t128_intr, IRQF_DISABLED, "t128",
instance)) {
printk("scsi%d : IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
instance->irq = SCSI_IRQ_NONE;
}
if (instance->irq == SCSI_IRQ_NONE) {
printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
}
#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif
printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
if (instance->irq == SCSI_IRQ_NONE)
printk (" interrupts disabled");
else
printk (" irq %d", instance->irq);
printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
NCR5380_print_options(instance);
printk("\n");
++current_override;
++count;
}
return count;
}
static int t128_release(struct Scsi_Host *shost)
{
NCR5380_local_declare();
NCR5380_setup(shost);
if (shost->irq)
free_irq(shost->irq, shost);
NCR5380_exit(shost);
if (shost->io_port && shost->n_io_port)
release_region(shost->io_port, shost->n_io_port);
scsi_unregister(shost);
iounmap(base);
return 0;
}
/*
* Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
*
* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
* the specified device / size.
*
* Inputs : size = size of device in sectors (512 bytes), dev = block device
* major / minor, ip[] = {heads, sectors, cylinders}
*
* Returns : always 0 (success), initializes ip
*
*/
/*
* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
* using hard disks on a trantor should verify that this mapping corresponds
* to that used by the BIOS / ASPI driver by running the linux fdisk program
* and matching the H_C_S coordinates to what DOS uses.
*/
int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int * ip)
{
ip[0] = 64;
ip[1] = 32;
ip[2] = capacity >> 11;
return 0;
}
/*
* Function : int NCR5380_pread (struct Scsi_Host *instance,
* unsigned char *dst, int len)
*
* Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
* dst
*
* Inputs : dst = destination, len = length in bytes
*
* Returns : 0 on success, non zero on a failure such as a watchdog
* timeout.
*/
static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
int len) {
NCR5380_local_declare();
void __iomem *reg;
unsigned char *d = dst;
register int i = len;
NCR5380_setup(instance);
reg = base + T_DATA_REG_OFFSET;
#if 0
for (; i; --i) {
while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
#else
while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
for (; i; --i) {
#endif
*d++ = readb(reg);
}
if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
unsigned char tmp;
void __iomem *foo = base + T_CONTROL_REG_OFFSET;
tmp = readb(foo);
writeb(tmp | T_CR_CT, foo);
writeb(tmp, foo);
printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
instance->host_no);
return -1;
} else
return 0;
}
/*
* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
* unsigned char *src, int len)
*
* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
* src
*
* Inputs : src = source, len = length in bytes
*
* Returns : 0 on success, non zero on a failure such as a watchdog
* timeout.
*/
static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
int len) {
NCR5380_local_declare();
void __iomem *reg;
unsigned char *s = src;
register int i = len;
NCR5380_setup(instance);
reg = base + T_DATA_REG_OFFSET;
#if 0
for (; i; --i) {
while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
#else
while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
for (; i; --i) {
#endif
writeb(*s++, reg);
}
if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
unsigned char tmp;
void __iomem *foo = base + T_CONTROL_REG_OFFSET;
tmp = readb(foo);
writeb(tmp | T_CR_CT, foo);
writeb(tmp, foo);
printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
instance->host_no);
return -1;
} else
return 0;
}
MODULE_LICENSE("GPL");
#include "NCR5380.c"
static struct scsi_host_template driver_template = {
.name = "Trantor T128/T128F/T228",
.detect = t128_detect,
.release = t128_release,
.queuecommand = t128_queue_command,
.eh_abort_handler = t128_abort,
.eh_bus_reset_handler = t128_bus_reset,
.bios_param = t128_biosparam,
.can_queue = CAN_QUEUE,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = CMD_PER_LUN,
.use_clustering = DISABLE_CLUSTERING,
};
#include "scsi_module.c"
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