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
ps3rom.c
/*
* PS3 BD/DVD/CD-ROM Storage Driver
*
* Copyright (C) 2007 Sony Computer Entertainment Inc.
* Copyright 2007 Sony Corp.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published
* by the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/cdrom.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_eh.h>
#include <asm/lv1call.h>
#include <asm/ps3stor.h>
#define DEVICE_NAME "ps3rom"
#define BOUNCE_SIZE (64*1024)
#define PS3ROM_MAX_SECTORS (BOUNCE_SIZE >> 9)
struct ps3rom_private {
struct ps3_storage_device *dev;
struct scsi_cmnd *curr_cmd;
};
#define LV1_STORAGE_SEND_ATAPI_COMMAND (1)
struct lv1_atapi_cmnd_block {
u8 pkt[32]; /* packet command block */
u32 pktlen; /* should be 12 for ATAPI 8020 */
u32 blocks;
u32 block_size;
u32 proto; /* transfer mode */
u32 in_out; /* transfer direction */
u64 buffer; /* parameter except command block */
u32 arglen; /* length above */
};
enum lv1_atapi_proto {
NON_DATA_PROTO = 0,
PIO_DATA_IN_PROTO = 1,
PIO_DATA_OUT_PROTO = 2,
DMA_PROTO = 3
};
enum lv1_atapi_in_out {
DIR_WRITE = 0, /* memory -> device */
DIR_READ = 1 /* device -> memory */
};
static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
{
struct ps3rom_private *priv = shost_priv(scsi_dev->host);
struct ps3_storage_device *dev = priv->dev;
dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
__LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
/*
* ATAPI SFF8020 devices use MODE_SENSE_10,
* so we can prohibit MODE_SENSE_6
*/
scsi_dev->use_10_for_ms = 1;
/* we don't support {READ,WRITE}_6 */
scsi_dev->use_10_for_rw = 1;
return 0;
}
static int ps3rom_atapi_request(struct ps3_storage_device *dev,
struct scsi_cmnd *cmd)
{
struct lv1_atapi_cmnd_block atapi_cmnd;
unsigned char opcode = cmd->cmnd[0];
int res;
u64 lpar;
dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
__LINE__, opcode);
memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
atapi_cmnd.pktlen = 12;
atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
atapi_cmnd.buffer = dev->bounce_lpar;
switch (cmd->sc_data_direction) {
case DMA_FROM_DEVICE:
if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
atapi_cmnd.proto = DMA_PROTO;
else
atapi_cmnd.proto = PIO_DATA_IN_PROTO;
atapi_cmnd.in_out = DIR_READ;
break;
case DMA_TO_DEVICE:
if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
atapi_cmnd.proto = DMA_PROTO;
else
atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
atapi_cmnd.in_out = DIR_WRITE;
scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
break;
default:
atapi_cmnd.proto = NON_DATA_PROTO;
break;
}
lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
res = lv1_storage_send_device_command(dev->sbd.dev_id,
LV1_STORAGE_SEND_ATAPI_COMMAND,
lpar, sizeof(atapi_cmnd),
atapi_cmnd.buffer,
atapi_cmnd.arglen, &dev->tag);
if (res == LV1_DENIED_BY_POLICY) {
dev_dbg(&dev->sbd.core,
"%s:%u: ATAPI command 0x%02x denied by policy\n",
__func__, __LINE__, opcode);
return DID_ERROR << 16;
}
if (res) {
dev_err(&dev->sbd.core,
"%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
__LINE__, opcode, res);
return DID_ERROR << 16;
}
return 0;
}
static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
{
return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
cmd->cmnd[5];
}
static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
{
return cmd->cmnd[7] << 8 | cmd->cmnd[8];
}
static int ps3rom_read_request(struct ps3_storage_device *dev,
struct scsi_cmnd *cmd, u32 start_sector,
u32 sectors)
{
int res;
dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
__func__, __LINE__, sectors, start_sector);
res = lv1_storage_read(dev->sbd.dev_id,
dev->regions[dev->region_idx].id, start_sector,
sectors, 0, dev->bounce_lpar, &dev->tag);
if (res) {
dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
__LINE__, res);
return DID_ERROR << 16;
}
return 0;
}
static int ps3rom_write_request(struct ps3_storage_device *dev,
struct scsi_cmnd *cmd, u32 start_sector,
u32 sectors)
{
int res;
dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
__func__, __LINE__, sectors, start_sector);
scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
res = lv1_storage_write(dev->sbd.dev_id,
dev->regions[dev->region_idx].id, start_sector,
sectors, 0, dev->bounce_lpar, &dev->tag);
if (res) {
dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
__LINE__, res);
return DID_ERROR << 16;
}
return 0;
}
static int ps3rom_queuecommand_lck(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct ps3rom_private *priv = shost_priv(cmd->device->host);
struct ps3_storage_device *dev = priv->dev;
unsigned char opcode;
int res;
#ifdef DEBUG
scsi_print_command(cmd);
#endif
priv->curr_cmd = cmd;
cmd->scsi_done = done;
opcode = cmd->cmnd[0];
/*
* While we can submit READ/WRITE SCSI commands as ATAPI commands,
* it's recommended for various reasons (performance, error handling,
* ...) to use lv1_storage_{read,write}() instead
*/
switch (opcode) {
case READ_10:
res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
srb10_len(cmd));
break;
case WRITE_10:
res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
srb10_len(cmd));
break;
default:
res = ps3rom_atapi_request(dev, cmd);
break;
}
if (res) {
memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
cmd->result = res;
cmd->sense_buffer[0] = 0x70;
cmd->sense_buffer[2] = ILLEGAL_REQUEST;
priv->curr_cmd = NULL;
cmd->scsi_done(cmd);
}
return 0;
}
static DEF_SCSI_QCMD(ps3rom_queuecommand)
static int decode_lv1_status(u64 status, unsigned char *sense_key,
unsigned char *asc, unsigned char *ascq)
{
if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
return -1;
*sense_key = (status >> 16) & 0xff;
*asc = (status >> 8) & 0xff;
*ascq = status & 0xff;
return 0;
}
static irqreturn_t ps3rom_interrupt(int irq, void *data)
{
struct ps3_storage_device *dev = data;
struct Scsi_Host *host;
struct ps3rom_private *priv;
struct scsi_cmnd *cmd;
int res;
u64 tag, status;
unsigned char sense_key, asc, ascq;
res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
/*
* status = -1 may mean that ATAPI transport completed OK, but
* ATAPI command itself resulted CHECK CONDITION
* so, upper layer should issue REQUEST_SENSE to check the sense data
*/
if (tag != dev->tag)
dev_err(&dev->sbd.core,
"%s:%u: tag mismatch, got %llx, expected %llx\n",
__func__, __LINE__, tag, dev->tag);
if (res) {
dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
__func__, __LINE__, res, status);
return IRQ_HANDLED;
}
host = ps3_system_bus_get_drvdata(&dev->sbd);
priv = shost_priv(host);
cmd = priv->curr_cmd;
if (!status) {
/* OK, completed */
if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
int len;
len = scsi_sg_copy_from_buffer(cmd,
dev->bounce_buf,
dev->bounce_size);
scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
}
cmd->result = DID_OK << 16;
goto done;
}
if (cmd->cmnd[0] == REQUEST_SENSE) {
/* SCSI spec says request sense should never get error */
dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
__func__, __LINE__);
cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
goto done;
}
if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
cmd->result = DID_ERROR << 16;
goto done;
}
scsi_build_sense_buffer(0, cmd->sense_buffer, sense_key, asc, ascq);
cmd->result = SAM_STAT_CHECK_CONDITION;
done:
priv->curr_cmd = NULL;
cmd->scsi_done(cmd);
return IRQ_HANDLED;
}
static struct scsi_host_template ps3rom_host_template = {
.name = DEVICE_NAME,
.slave_configure = ps3rom_slave_configure,
.queuecommand = ps3rom_queuecommand,
.can_queue = 1,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 1,
.emulated = 1, /* only sg driver uses this */
.max_sectors = PS3ROM_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.module = THIS_MODULE,
};
static int ps3rom_probe(struct ps3_system_bus_device *_dev)
{
struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
int error;
struct Scsi_Host *host;
struct ps3rom_private *priv;
if (dev->blk_size != CD_FRAMESIZE) {
dev_err(&dev->sbd.core,
"%s:%u: cannot handle block size %llu\n", __func__,
__LINE__, dev->blk_size);
return -EINVAL;
}
dev->bounce_size = BOUNCE_SIZE;
dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
if (!dev->bounce_buf)
return -ENOMEM;
error = ps3stor_setup(dev, ps3rom_interrupt);
if (error)
goto fail_free_bounce;
host = scsi_host_alloc(&ps3rom_host_template,
sizeof(struct ps3rom_private));
if (!host) {
dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
__func__, __LINE__);
goto fail_teardown;
}
priv = shost_priv(host);
ps3_system_bus_set_drvdata(&dev->sbd, host);
priv->dev = dev;
/* One device/LUN per SCSI bus */
host->max_id = 1;
host->max_lun = 1;
error = scsi_add_host(host, &dev->sbd.core);
if (error) {
dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
__func__, __LINE__, error);
error = -ENODEV;
goto fail_host_put;
}
scsi_scan_host(host);
return 0;
fail_host_put:
scsi_host_put(host);
ps3_system_bus_set_drvdata(&dev->sbd, NULL);
fail_teardown:
ps3stor_teardown(dev);
fail_free_bounce:
kfree(dev->bounce_buf);
return error;
}
static int ps3rom_remove(struct ps3_system_bus_device *_dev)
{
struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd);
scsi_remove_host(host);
ps3stor_teardown(dev);
scsi_host_put(host);
ps3_system_bus_set_drvdata(&dev->sbd, NULL);
kfree(dev->bounce_buf);
return 0;
}
static struct ps3_system_bus_driver ps3rom = {
.match_id = PS3_MATCH_ID_STOR_ROM,
.core.name = DEVICE_NAME,
.core.owner = THIS_MODULE,
.probe = ps3rom_probe,
.remove = ps3rom_remove
};
static int __init ps3rom_init(void)
{
return ps3_system_bus_driver_register(&ps3rom);
}
static void __exit ps3rom_exit(void)
{
ps3_system_bus_driver_unregister(&ps3rom);
}
module_init(ps3rom_init);
module_exit(ps3rom_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);
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