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block: unify request timeout handling

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Right now SCSI and others do their own command timeout handling.
Move those bits to the block layer.

Instead of having a timer per command, we try to be a bit more clever
and simply have one per-queue. This avoids the overhead of having to
tear down and setup a timer for each command, so it will result in a lot
less timer fiddling.

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-09-14 05:55:09 -07:00
parent 608aeef17a
commit 242f9dcb8b
39 changed files with 399 additions and 339 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
block/Makefile
View File

@ -4,8 +4,8 @@
obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \
blk-barrier.o blk-settings.o blk-ioc.o blk-map.o \
blk-exec.o blk-merge.o blk-softirq.o ioctl.o genhd.o \
scsi_ioctl.o cmd-filter.o
blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
ioctl.o genhd.o scsi_ioctl.o cmd-filter.o
obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o

7
block/blk-core.c
View File

@ -110,6 +110,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
memset(rq, 0, sizeof(*rq));
INIT_LIST_HEAD(&rq->queuelist);
INIT_LIST_HEAD(&rq->timeout_list);
rq->cpu = -1;
rq->q = q;
rq->sector = rq->hard_sector = (sector_t) -1;
@ -490,6 +491,8 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
}
init_timer(&q->unplug_timer);
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
INIT_LIST_HEAD(&q->timeout_list);
kobject_init(&q->kobj, &blk_queue_ktype);
@ -897,6 +900,8 @@ EXPORT_SYMBOL(blk_start_queueing);
*/
void blk_requeue_request(struct request_queue *q, struct request *rq)
{
blk_delete_timer(rq);
blk_clear_rq_complete(rq);
blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
if (blk_rq_tagged(rq))
@ -1650,6 +1655,8 @@ static void end_that_request_last(struct request *req, int error)
{
struct gendisk *disk = req->rq_disk;
blk_delete_timer(req);
if (blk_rq_tagged(req))
blk_queue_end_tag(req->q, req);

12
block/blk-settings.c
View File

@ -77,6 +77,18 @@ void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn)
}
EXPORT_SYMBOL(blk_queue_softirq_done);
void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)
{
q->rq_timeout = timeout;
}
EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
void blk_queue_rq_timed_out(struct request_queue *q, rq_timed_out_fn *fn)
{
q->rq_timed_out_fn = fn;
}
EXPORT_SYMBOL_GPL(blk_queue_rq_timed_out);
/**
* blk_queue_make_request - define an alternate make_request function for a device
* @q: the request queue for the device to be affected

30
block/blk-softirq.c
View File

@ -101,18 +101,7 @@ static struct notifier_block __cpuinitdata blk_cpu_notifier = {
.notifier_call = blk_cpu_notify,
};
/**
* blk_complete_request - end I/O on a request
* @req: the request being processed
*
* Description:
* Ends all I/O on a request. It does not handle partial completions,
* unless the driver actually implements this in its completion callback
* through requeueing. The actual completion happens out-of-order,
* through a softirq handler. The user must have registered a completion
* callback through blk_queue_softirq_done().
**/
void blk_complete_request(struct request *req)
void __blk_complete_request(struct request *req)
{
struct request_queue *q = req->q;
unsigned long flags;
@ -151,6 +140,23 @@ void blk_complete_request(struct request *req)
local_irq_restore(flags);
}
/**
* blk_complete_request - end I/O on a request
* @req: the request being processed
*
* Description:
* Ends all I/O on a request. It does not handle partial completions,
* unless the driver actually implements this in its completion callback
* through requeueing. The actual completion happens out-of-order,
* through a softirq handler. The user must have registered a completion
* callback through blk_queue_softirq_done().
**/
void blk_complete_request(struct request *req)
{
if (!blk_mark_rq_complete(req))
__blk_complete_request(req);
}
EXPORT_SYMBOL(blk_complete_request);
__init int blk_softirq_init(void)

155
block/blk-timeout.c Normal file
View File

@ -0,0 +1,155 @@
/*
* Functions related to generic timeout handling of requests.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include "blk.h"
/*
* blk_delete_timer - Delete/cancel timer for a given function.
* @req: request that we are canceling timer for
*
*/
void blk_delete_timer(struct request *req)
{
struct request_queue *q = req->q;
/*
* Nothing to detach
*/
if (!q->rq_timed_out_fn || !req->deadline)
return;
list_del_init(&req->timeout_list);
if (list_empty(&q->timeout_list))
del_timer(&q->timeout);
}
static void blk_rq_timed_out(struct request *req)
{
struct request_queue *q = req->q;
enum blk_eh_timer_return ret;
ret = q->rq_timed_out_fn(req);
switch (ret) {
case BLK_EH_HANDLED:
__blk_complete_request(req);
break;
case BLK_EH_RESET_TIMER:
blk_clear_rq_complete(req);
blk_add_timer(req);
break;
case BLK_EH_NOT_HANDLED:
/*
* LLD handles this for now but in the future
* we can send a request msg to abort the command
* and we can move more of the generic scsi eh code to
* the blk layer.
*/
break;
default:
printk(KERN_ERR "block: bad eh return: %d\n", ret);
break;
}
}
void blk_rq_timed_out_timer(unsigned long data)
{
struct request_queue *q = (struct request_queue *) data;
unsigned long flags, uninitialized_var(next), next_set = 0;
struct request *rq, *tmp;
spin_lock_irqsave(q->queue_lock, flags);
list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) {
if (time_after_eq(jiffies, rq->deadline)) {
list_del_init(&rq->timeout_list);
/*
* Check if we raced with end io completion
*/
if (blk_mark_rq_complete(rq))
continue;
blk_rq_timed_out(rq);
}
if (!next_set) {
next = rq->deadline;
next_set = 1;
} else if (time_after(next, rq->deadline))
next = rq->deadline;
}
if (next_set && !list_empty(&q->timeout_list))
mod_timer(&q->timeout, round_jiffies(next));
spin_unlock_irqrestore(q->queue_lock, flags);
}
/**
* blk_abort_request -- Request request recovery for the specified command
* @req: pointer to the request of interest
*
* This function requests that the block layer start recovery for the
* request by deleting the timer and calling the q's timeout function.
* LLDDs who implement their own error recovery MAY ignore the timeout
* event if they generated blk_abort_req. Must hold queue lock.
*/
void blk_abort_request(struct request *req)
{
blk_delete_timer(req);
blk_rq_timed_out(req);
}
EXPORT_SYMBOL_GPL(blk_abort_request);
/**
* blk_add_timer - Start timeout timer for a single request
* @req: request that is about to start running.
*
* Notes:
* Each request has its own timer, and as it is added to the queue, we
* set up the timer. When the request completes, we cancel the timer.
*/
void blk_add_timer(struct request *req)
{
struct request_queue *q = req->q;
unsigned long expiry;
if (!q->rq_timed_out_fn)
return;
BUG_ON(!list_empty(&req->timeout_list));
BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
if (req->timeout)
req->deadline = jiffies + req->timeout;
else {
req->deadline = jiffies + q->rq_timeout;
/*
* Some LLDs, like scsi, peek at the timeout to prevent
* a command from being retried forever.
*/
req->timeout = q->rq_timeout;
}
list_add_tail(&req->timeout_list, &q->timeout_list);
/*
* If the timer isn't already pending or this timeout is earlier
* than an existing one, modify the timer. Round to next nearest
* second.
*/
expiry = round_jiffies(req->deadline);
/*
* We use ->deadline == 0 to detect whether a timer was added or
* not, so just increase to next jiffy for that specific case
*/
if (unlikely(!req->deadline))
req->deadline = 1;
if (!timer_pending(&q->timeout) ||
time_before(expiry, q->timeout.expires))
mod_timer(&q->timeout, expiry);
}

24
block/blk.h
View File

@ -17,6 +17,30 @@ void __blk_queue_free_tags(struct request_queue *q);
void blk_unplug_work(struct work_struct *work);
void blk_unplug_timeout(unsigned long data);
void blk_rq_timed_out_timer(unsigned long data);
void blk_delete_timer(struct request *);
void blk_add_timer(struct request *);
/*
* Internal atomic flags for request handling
*/
enum rq_atomic_flags {
REQ_ATOM_COMPLETE = 0,
};
/*
* EH timer and IO completion will both attempt to 'grab' the request, make
* sure that only one of them suceeds
*/
static inline int blk_mark_rq_complete(struct request *rq)
{
return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
}
static inline void blk_clear_rq_complete(struct request *rq)
{
clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
}
struct io_context *current_io_context(gfp_t gfp_flags, int node);

8
block/elevator.c
View File

@ -36,6 +36,8 @@
#include <linux/hash.h>
#include <linux/uaccess.h>
#include "blk.h"
static DEFINE_SPINLOCK(elv_list_lock);
static LIST_HEAD(elv_list);
@ -771,6 +773,12 @@ struct request *elv_next_request(struct request_queue *q)
*/
rq->cmd_flags |= REQ_STARTED;
blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
/*
* We are now handing the request to the hardware,
* add the timeout handler
*/
blk_add_timer(rq);
}
if (!q->boundary_rq || q->boundary_rq == rq) {

13
drivers/ata/libata-eh.c
View File

@ -33,6 +33,7 @@
*/
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
@ -457,29 +458,29 @@ static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct ata_port *ap = ata_shost_to_port(host);
unsigned long flags;
struct ata_queued_cmd *qc;
enum scsi_eh_timer_return ret;
enum blk_eh_timer_return ret;
DPRINTK("ENTER\n");
if (ap->ops->error_handler) {
ret = EH_NOT_HANDLED;
ret = BLK_EH_NOT_HANDLED;
goto out;
}
ret = EH_HANDLED;
ret = BLK_EH_HANDLED;
spin_lock_irqsave(ap->lock, flags);
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc) {
WARN_ON(qc->scsicmd != cmd);
qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
qc->err_mask |= AC_ERR_TIMEOUT;
ret = EH_NOT_HANDLED;
ret = BLK_EH_NOT_HANDLED;
}
spin_unlock_irqrestore(ap->lock, flags);
@ -831,7 +832,7 @@ void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
* Note that ATA_QCFLAG_FAILED is unconditionally set after
* this function completes.
*/
scsi_req_abort_cmd(qc->scsicmd);
blk_abort_request(qc->scsicmd->request);
}
/**

2
drivers/ata/libata.h
View File

@ -152,7 +152,7 @@ extern int ata_bus_probe(struct ata_port *ap);
/* libata-eh.c */
extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
extern void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd);
extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern void ata_scsi_error(struct Scsi_Host *host);
extern void ata_port_wait_eh(struct ata_port *ap);
extern void ata_eh_fastdrain_timerfn(unsigned long arg);

2
drivers/scsi/aacraid/aachba.c
View File

@ -1139,7 +1139,7 @@ static struct aac_srb * aac_scsi_common(struct fib * fib, struct scsi_cmnd * cmd
srbcmd->id = cpu_to_le32(scmd_id(cmd));
srbcmd->lun = cpu_to_le32(cmd->device->lun);
srbcmd->flags = cpu_to_le32(flag);
timeout = cmd->timeout_per_command/HZ;
timeout = cmd->request->timeout/HZ;
if (timeout == 0)
timeout = 1;
srbcmd->timeout = cpu_to_le32(timeout); // timeout in seconds

60
drivers/scsi/gdth.c
View File

@ -464,7 +464,6 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd,
/* use request field to save the ptr. to completion struct. */
scp->request = (struct request *)&wait;
scp->timeout_per_command = timeout*HZ;
scp->cmd_len = 12;
scp->cmnd = cmnd;
cmndinfo.priority = IOCTL_PRI;
@ -1995,23 +1994,12 @@ static void gdth_putq(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar priority)
register Scsi_Cmnd *pscp;
register Scsi_Cmnd *nscp;
ulong flags;
unchar b, t;
TRACE(("gdth_putq() priority %d\n",priority));
spin_lock_irqsave(&ha->smp_lock, flags);
if (!cmndinfo->internal_command) {
if (!cmndinfo->internal_command)
cmndinfo->priority = priority;
b = scp->device->channel;
t = scp->device->id;
if (priority >= DEFAULT_PRI) {
if ((b != ha->virt_bus && ha->raw[BUS_L2P(ha,b)].lock) ||
(b==ha->virt_bus && t<MAX_HDRIVES && ha->hdr[t].lock)) {
TRACE2(("gdth_putq(): locked IO ->update_timeout()\n"));
cmndinfo->timeout = gdth_update_timeout(scp, 0);
}
}
}
if (ha->req_first==NULL) {
ha->req_first = scp; /* queue was empty */
@ -3899,6 +3887,39 @@ static const char *gdth_info(struct Scsi_Host *shp)
return ((const char *)ha->binfo.type_string);
}
static enum blk_eh_timer_return gdth_timed_out(struct scsi_cmnd *scp)
{
gdth_ha_str *ha = shost_priv(scp->device->host);
struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
unchar b, t;
ulong flags;
enum blk_eh_timer_return retval = BLK_EH_NOT_HANDLED;
TRACE(("%s() cmd 0x%x\n", scp->cmnd[0], __func__));
b = scp->device->channel;
t = scp->device->id;
/*
* We don't really honor the command timeout, but we try to
* honor 6 times of the actual command timeout! So reset the
* timer if this is less than 6th timeout on this command!
*/
if (++cmndinfo->timeout_count < 6)
retval = BLK_EH_RESET_TIMER;
/* Reset the timeout if it is locked IO */
spin_lock_irqsave(&ha->smp_lock, flags);
if ((b != ha->virt_bus && ha->raw[BUS_L2P(ha, b)].lock) ||
(b == ha->virt_bus && t < MAX_HDRIVES && ha->hdr[t].lock)) {
TRACE2(("%s(): locked IO, reset timeout\n", __func__));
retval = BLK_EH_RESET_TIMER;
}
spin_unlock_irqrestore(&ha->smp_lock, flags);
return retval;
}
static int gdth_eh_bus_reset(Scsi_Cmnd *scp)
{
gdth_ha_str *ha = shost_priv(scp->device->host);
@ -3992,7 +4013,7 @@ static int gdth_queuecommand(struct scsi_cmnd *scp,
BUG_ON(!cmndinfo);
scp->scsi_done = done;
gdth_update_timeout(scp, scp->timeout_per_command * 6);
cmndinfo->timeout_count = 0;
cmndinfo->priority = DEFAULT_PRI;
return __gdth_queuecommand(ha, scp, cmndinfo);
@ -4096,12 +4117,10 @@ static int ioc_lockdrv(void __user *arg)
ha->hdr[j].lock = 1;
spin_unlock_irqrestore(&ha->smp_lock, flags);
gdth_wait_completion(ha, ha->bus_cnt, j);
gdth_stop_timeout(ha, ha->bus_cnt, j);
} else {
spin_lock_irqsave(&ha->smp_lock, flags);
ha->hdr[j].lock = 0;
spin_unlock_irqrestore(&ha->smp_lock, flags);
gdth_start_timeout(ha, ha->bus_cnt, j);
gdth_next(ha);
}
}
@ -4539,18 +4558,14 @@ static int gdth_ioctl(struct inode *inode, struct file *filep,
spin_lock_irqsave(&ha->smp_lock, flags);
ha->raw[i].lock = 1;
spin_unlock_irqrestore(&ha->smp_lock, flags);
for (j = 0; j < ha->tid_cnt; ++j) {
for (j = 0; j < ha->tid_cnt; ++j)
gdth_wait_completion(ha, i, j);
gdth_stop_timeout(ha, i, j);
}
} else {
spin_lock_irqsave(&ha->smp_lock, flags);
ha->raw[i].lock = 0;
spin_unlock_irqrestore(&ha->smp_lock, flags);
for (j = 0; j < ha->tid_cnt; ++j) {
gdth_start_timeout(ha, i, j);
for (j = 0; j < ha->tid_cnt; ++j)
gdth_next(ha);
}
}
}
break;
@ -4644,6 +4659,7 @@ static struct scsi_host_template gdth_template = {
.slave_configure = gdth_slave_configure,
.bios_param = gdth_bios_param,
.proc_info = gdth_proc_info,
.eh_timed_out = gdth_timed_out,
.proc_name = "gdth",
.can_queue = GDTH_MAXCMDS,
.this_id = -1,

2
drivers/scsi/gdth.h
View File

@ -916,7 +916,7 @@ typedef struct {
gdth_cmd_str *internal_cmd_str; /* crier for internal messages*/
dma_addr_t sense_paddr; /* sense dma-addr */
unchar priority;
int timeout;
int timeout_count; /* # of timeout calls */
volatile int wait_for_completion;
ushort status;
ulong32 info;

66
drivers/scsi/gdth_proc.c
View File

@ -748,69 +748,3 @@ static void gdth_wait_completion(gdth_ha_str *ha, int busnum, int id)
}
spin_unlock_irqrestore(&ha->smp_lock, flags);
}
static void gdth_stop_timeout(gdth_ha_str *ha, int busnum, int id)
{
ulong flags;
Scsi_Cmnd *scp;
unchar b, t;
spin_lock_irqsave(&ha->smp_lock, flags);
for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
if (!cmndinfo->internal_command) {
b = scp->device->channel;
t = scp->device->id;
if (t == (unchar)id && b == (unchar)busnum) {
TRACE2(("gdth_stop_timeout(): update_timeout()\n"));
cmndinfo->timeout = gdth_update_timeout(scp, 0);
}
}
}
spin_unlock_irqrestore(&ha->smp_lock, flags);
}
static void gdth_start_timeout(gdth_ha_str *ha, int busnum, int id)
{
ulong flags;
Scsi_Cmnd *scp;
unchar b, t;
spin_lock_irqsave(&ha->smp_lock, flags);
for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
if (!cmndinfo->internal_command) {
b = scp->device->channel;
t = scp->device->id;
if (t == (unchar)id && b == (unchar)busnum) {
TRACE2(("gdth_start_timeout(): update_timeout()\n"));
gdth_update_timeout(scp, cmndinfo->timeout);
}
}
}
spin_unlock_irqrestore(&ha->smp_lock, flags);
}
static int gdth_update_timeout(Scsi_Cmnd *scp, int timeout)
{
int oldto;
oldto = scp->timeout_per_command;
scp->timeout_per_command = timeout;
if (timeout == 0) {
del_timer(&scp->eh_timeout);
scp->eh_timeout.data = (unsigned long) NULL;
scp->eh_timeout.expires = 0;
} else {
if (scp->eh_timeout.data != (unsigned long) NULL)
del_timer(&scp->eh_timeout);
scp->eh_timeout.data = (unsigned long) scp;
scp->eh_timeout.expires = jiffies + timeout;
add_timer(&scp->eh_timeout);
}
return oldto;
}

3
drivers/scsi/gdth_proc.h
View File

@ -20,9 +20,6 @@ static char *gdth_ioctl_alloc(gdth_ha_str *ha, int size, int scratch,
ulong64 *paddr);
static void gdth_ioctl_free(gdth_ha_str *ha, int size, char *buf, ulong64 paddr);
static void gdth_wait_completion(gdth_ha_str *ha, int busnum, int id);
static void gdth_stop_timeout(gdth_ha_str *ha, int busnum, int id);
static void gdth_start_timeout(gdth_ha_str *ha, int busnum, int id);
static int gdth_update_timeout(Scsi_Cmnd *scp, int timeout);
#endif

2
drivers/scsi/ibmvscsi/ibmvscsi.c
View File

@ -756,7 +756,7 @@ static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
init_event_struct(evt_struct,
handle_cmd_rsp,
VIOSRP_SRP_FORMAT,
cmnd->timeout_per_command/HZ);
cmnd->request->timeout/HZ);
evt_struct->cmnd = cmnd;
evt_struct->cmnd_done = done;

2
drivers/scsi/ide-scsi.c
View File

@ -612,7 +612,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;
pc->done = done;
pc->timeout = jiffies + cmd->timeout_per_command;
pc->timeout = jiffies + cmd->request->timeout;
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);

3
drivers/scsi/ipr.c
View File

@ -3670,7 +3670,8 @@ static int ipr_slave_configure(struct scsi_device *sdev)
sdev->no_uld_attach = 1;
}
if (ipr_is_vset_device(res)) {
sdev->timeout = IPR_VSET_RW_TIMEOUT;
blk_queue_rq_timeout(sdev->request_queue,
IPR_VSET_RW_TIMEOUT);
blk_queue_max_sectors(sdev->request_queue, IPR_VSET_MAX_SECTORS);
}
if (ipr_is_vset_device(res) || ipr_is_scsi_disk(res))

2
drivers/scsi/ips.c
View File

@ -3818,7 +3818,7 @@ ips_send_cmd(ips_ha_t * ha, ips_scb_t * scb)
scb->cmd.dcdb.segment_4G = 0;
scb->cmd.dcdb.enhanced_sg = 0;
TimeOut = scb->scsi_cmd->timeout_per_command;
TimeOut = scb->scsi_cmd->request->timeout;
if (ha->subsys->param[4] & 0x00100000) { /* If NEW Tape DCDB is Supported */
if (!scb->sg_len) {

17
drivers/scsi/libiscsi.c
View File

@ -1476,12 +1476,12 @@ static void iscsi_start_tx(struct iscsi_conn *conn)
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
struct iscsi_conn *conn;
enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
cls_session = starget_to_session(scsi_target(scmd->device));
session = cls_session->dd_data;
@ -1494,14 +1494,14 @@ static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
* We are probably in the middle of iscsi recovery so let
* that complete and handle the error.
*/
rc = EH_RESET_TIMER;
rc = BLK_EH_RESET_TIMER;
goto done;
}
conn = session->leadconn;
if (!conn) {
/* In the middle of shuting down */
rc = EH_RESET_TIMER;
rc = BLK_EH_RESET_TIMER;
goto done;
}
@ -1513,20 +1513,21 @@ static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
*/
if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
(conn->ping_timeout * HZ), jiffies))
rc = EH_RESET_TIMER;
rc = BLK_EH_RESET_TIMER;
/*
* if we are about to check the transport then give the command
* more time
*/
if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
jiffies))
rc = EH_RESET_TIMER;
rc = BLK_EH_RESET_TIMER;
/* if in the middle of checking the transport then give us more time */
if (conn->ping_task)
rc = EH_RESET_TIMER;
rc = BLK_EH_RESET_TIMER;
done:
spin_unlock(&session->lock);
debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
debug_scsi("return %s\n", rc == BLK_EH_RESET_TIMER ?
"timer reset" : "nh");
return rc;
}

2
drivers/scsi/libsas/sas_ata.c
View File

@ -398,7 +398,7 @@ void sas_ata_task_abort(struct sas_task *task)
/* Bounce SCSI-initiated commands to the SCSI EH */
if (qc->scsicmd) {
scsi_req_abort_cmd(qc->scsicmd);
blk_abort_request(qc->scsicmd->request);
scsi_schedule_eh(qc->scsicmd->device->host);
return;
}

2
drivers/scsi/libsas/sas_internal.h
View File

@ -55,7 +55,7 @@ void sas_unregister_phys(struct sas_ha_struct *sas_ha);
int sas_register_ports(struct sas_ha_struct *sas_ha);
void sas_unregister_ports(struct sas_ha_struct *sas_ha);
enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
int sas_init_queue(struct sas_ha_struct *sas_ha);
int sas_init_events(struct sas_ha_struct *sas_ha);

30
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -673,43 +673,43 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
return;
}
enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct sas_task *task = TO_SAS_TASK(cmd);
unsigned long flags;
if (!task) {
cmd->timeout_per_command /= 2;
cmd->request->timeout /= 2;
SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
cmd, task, (cmd->timeout_per_command ?
"EH_RESET_TIMER" : "EH_NOT_HANDLED"));
if (!cmd->timeout_per_command)
return EH_NOT_HANDLED;
return EH_RESET_TIMER;
cmd, task, (cmd->request->timeout ?
"BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
if (!cmd->request->timeout)
return BLK_EH_NOT_HANDLED;
return BLK_EH_RESET_TIMER;
}
spin_lock_irqsave(&task->task_state_lock, flags);
BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
cmd, task);
return EH_HANDLED;
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
"BLK_EH_HANDLED\n", cmd, task);
return BLK_EH_HANDLED;
}
if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
"EH_RESET_TIMER\n",
"BLK_EH_RESET_TIMER\n",
cmd, task);
return EH_RESET_TIMER;
return BLK_EH_RESET_TIMER;
}
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
cmd, task);
return EH_NOT_HANDLED;
return BLK_EH_NOT_HANDLED;
}
int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
@ -1039,7 +1039,7 @@ void sas_task_abort(struct sas_task *task)
return;
}
scsi_req_abort_cmd(sc);
blk_abort_request(sc->request);
scsi_schedule_eh(sc->device->host);
}

6
drivers/scsi/megaraid/megaraid_sas.c
View File

@ -1167,7 +1167,7 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd)
* cmd has not been completed within the timeout period.
*/
static enum
scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
struct megasas_instance *instance;
@ -1175,7 +1175,7 @@ scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
if (time_after(jiffies, scmd->jiffies_at_alloc +
(MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
return EH_NOT_HANDLED;
return BLK_EH_NOT_HANDLED;
}
instance = cmd->instance;
@ -1189,7 +1189,7 @@ scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
spin_unlock_irqrestore(instance->host->host_lock, flags);
}
return EH_RESET_TIMER;
return BLK_EH_RESET_TIMER;
}
/**

4
drivers/scsi/ncr53c8xx.c
View File

@ -4170,8 +4170,8 @@ static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
**
**----------------------------------------------------
*/
if (np->settle_time && cmd->timeout_per_command >= HZ) {
u_long tlimit = jiffies + cmd->timeout_per_command - HZ;
if (np->settle_time && cmd->request->timeout >= HZ) {
u_long tlimit = jiffies + cmd->request->timeout - HZ;
if (time_after(np->settle_time, tlimit))
np->settle_time = tlimit;
}

4
drivers/scsi/qla1280.c
View File

@ -2845,7 +2845,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));
/* Set ISP command timeout. */
pkt->timeout = cpu_to_le16(cmd->timeout_per_command/HZ);
pkt->timeout = cpu_to_le16(cmd->request->timeout/HZ);
/* Set device target ID and LUN */
pkt->lun = SCSI_LUN_32(cmd);
@ -3114,7 +3114,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));
/* Set ISP command timeout. */
pkt->timeout = cpu_to_le16(cmd->timeout_per_command/HZ);
pkt->timeout = cpu_to_le16(cmd->request->timeout/HZ);
/* Set device target ID and LUN */
pkt->lun = SCSI_LUN_32(cmd);

4
drivers/scsi/qla4xxx/ql4_os.c
View File

@ -1542,7 +1542,7 @@ static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
DEBUG2(printk(KERN_INFO
"scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
"dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
cmd, jiffies, cmd->timeout_per_command / HZ,
cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
/* FIXME: wait for hba to go online */
@ -1598,7 +1598,7 @@ static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
DEBUG2(printk(KERN_INFO
"scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
"to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
ha->host_no, cmd, jiffies, cmd->timeout_per_command / HZ,
ha->host_no, cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
stat = qla4xxx_reset_target(ha, ddb_entry);

92
drivers/scsi/scsi.c
View File

@ -291,7 +291,6 @@ struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask)
unsigned long flags;
cmd->device = dev;
init_timer(&cmd->eh_timeout);
INIT_LIST_HEAD(&cmd->list);
spin_lock_irqsave(&dev->list_lock, flags);
list_add_tail(&cmd->list, &dev->cmd_list);
@ -652,14 +651,19 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
unsigned long timeout;
int rtn = 0;
/*
* We will use a queued command if possible, otherwise we will
* emulate the queuing and calling of completion function ourselves.
*/
atomic_inc(&cmd->device->iorequest_cnt);
/* check if the device is still usable */
if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
/* in SDEV_DEL we error all commands. DID_NO_CONNECT
* returns an immediate error upwards, and signals
* that the device is no longer present */
cmd->result = DID_NO_CONNECT << 16;
atomic_inc(&cmd->device->iorequest_cnt);
__scsi_done(cmd);
scsi_done(cmd);
/* return 0 (because the command has been processed) */
goto out;
}
@ -672,6 +676,7 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
* future requests should not occur until the device
* transitions out of the suspend state.
*/
scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY);
SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n"));
@ -714,20 +719,8 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
host->resetting = 0;
}
/*
* AK: unlikely race here: for some reason the timer could
* expire before the serial number is set up below.
*/
scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out);
scsi_log_send(cmd);
/*
* We will use a queued command if possible, otherwise we will
* emulate the queuing and calling of completion function ourselves.
*/
atomic_inc(&cmd->device->iorequest_cnt);
/*
* Before we queue this command, check if the command
* length exceeds what the host adapter can handle.
@ -744,6 +737,12 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
}
spin_lock_irqsave(host->host_lock, flags);
/*
* AK: unlikely race here: for some reason the timer could
* expire before the serial number is set up below.
*
* TODO: kill serial or move to blk layer
*/
scsi_cmd_get_serial(host, cmd);
if (unlikely(host->shost_state == SHOST_DEL)) {
@ -754,12 +753,8 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
}
spin_unlock_irqrestore(host->host_lock, flags);
if (rtn) {
if (scsi_delete_timer(cmd)) {
atomic_inc(&cmd->device->iodone_cnt);
scsi_queue_insert(cmd,
(rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
rtn : SCSI_MLQUEUE_HOST_BUSY);
}
scsi_queue_insert(cmd, (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
rtn : SCSI_MLQUEUE_HOST_BUSY);
SCSI_LOG_MLQUEUE(3,
printk("queuecommand : request rejected\n"));
}
@ -769,24 +764,6 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
return rtn;
}
/**
* scsi_req_abort_cmd -- Request command recovery for the specified command
* @cmd: pointer to the SCSI command of interest
*
* This function requests that SCSI Core start recovery for the
* command by deleting the timer and adding the command to the eh
* queue. It can be called by either LLDDs or SCSI Core. LLDDs who
* implement their own error recovery MAY ignore the timeout event if
* they generated scsi_req_abort_cmd.
*/
void scsi_req_abort_cmd(struct scsi_cmnd *cmd)
{
if (!scsi_delete_timer(cmd))
return;
scsi_times_out(cmd);
}
EXPORT_SYMBOL(scsi_req_abort_cmd);
/**
* scsi_done - Enqueue the finished SCSI command into the done queue.
* @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
@ -802,42 +779,7 @@ EXPORT_SYMBOL(scsi_req_abort_cmd);
*/
static void scsi_done(struct scsi_cmnd *cmd)
{
/*
* We don't have to worry about this one timing out anymore.
* If we are unable to remove the timer, then the command
* has already timed out. In which case, we have no choice but to
* let the timeout function run, as we have no idea where in fact
* that function could really be. It might be on another processor,
* etc, etc.
*/
if (!scsi_delete_timer(cmd))
return;
__scsi_done(cmd);
}
/* Private entry to scsi_done() to complete a command when the timer
* isn't running --- used by scsi_times_out */
void __scsi_done(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
/*
* Set the serial numbers back to zero
*/
cmd->serial_number = 0;
atomic_inc(&cmd->device->iodone_cnt);
if (cmd->result)
atomic_inc(&cmd->device->ioerr_cnt);
BUG_ON(!rq);
/*
* The uptodate/nbytes values don't matter, as we allow partial
* completes and thus will check this in the softirq callback
*/
rq->completion_data = cmd;
blk_complete_request(rq);
blk_complete_request(cmd->request);
}
/* Move this to a header if it becomes more generally useful */

90
drivers/scsi/scsi_error.c
View File

@ -111,70 +111,9 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
return ret;
}
/**
* scsi_add_timer - Start timeout timer for a single scsi command.
* @scmd: scsi command that is about to start running.
* @timeout: amount of time to allow this command to run.
* @complete: timeout function to call if timer isn't canceled.
*
* Notes:
* This should be turned into an inline function. Each scsi command
* has its own timer, and as it is added to the queue, we set up the
* timer. When the command completes, we cancel the timer.
*/
void scsi_add_timer(struct scsi_cmnd *scmd, int timeout,
void (*complete)(struct scsi_cmnd *))
{
/*
* If the clock was already running for this command, then
* first delete the timer. The timer handling code gets rather
* confused if we don't do this.
*/
if (scmd->eh_timeout.function)
del_timer(&scmd->eh_timeout);
scmd->eh_timeout.data = (unsigned long)scmd;
scmd->eh_timeout.expires = jiffies + timeout;
scmd->eh_timeout.function = (void (*)(unsigned long)) complete;
SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
" %d, (%p)\n", __func__,
scmd, timeout, complete));
add_timer(&scmd->eh_timeout);
}
/**
* scsi_delete_timer - Delete/cancel timer for a given function.
* @scmd: Cmd that we are canceling timer for
*
* Notes:
* This should be turned into an inline function.
*
* Return value:
* 1 if we were able to detach the timer. 0 if we blew it, and the
* timer function has already started to run.
*/
int scsi_delete_timer(struct scsi_cmnd *scmd)
{
int rtn;
rtn = del_timer(&scmd->eh_timeout);
SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
" rtn: %d\n", __func__,
scmd, rtn));
scmd->eh_timeout.data = (unsigned long)NULL;
scmd->eh_timeout.function = NULL;
return rtn;
}
/**
* scsi_times_out - Timeout function for normal scsi commands.
* @scmd: Cmd that is timing out.
* @req: request that is timing out.
*
* Notes:
* We do not need to lock this. There is the potential for a race
@ -182,9 +121,11 @@ int scsi_delete_timer(struct scsi_cmnd *scmd)
* normal completion function determines that the timer has already
* fired, then it mustn't do anything.
*/
void scsi_times_out(struct scsi_cmnd *scmd)
enum blk_eh_timer_return scsi_times_out(struct request *req)
{
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
struct scsi_cmnd *scmd = req->special;
enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
scsi_log_completion(scmd, TIMEOUT_ERROR);
@ -196,22 +137,20 @@ void scsi_times_out(struct scsi_cmnd *scmd)
eh_timed_out = NULL;
if (eh_timed_out)
switch (eh_timed_out(scmd)) {
case EH_HANDLED:
__scsi_done(scmd);
return;
case EH_RESET_TIMER:
scsi_add_timer(scmd, scmd->timeout_per_command,
scsi_times_out);
return;
case EH_NOT_HANDLED:
rtn = eh_timed_out(scmd);
switch (rtn) {
case BLK_EH_NOT_HANDLED:
break;
default:
return rtn;
}
if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
scmd->result |= DID_TIME_OUT << 16;
__scsi_done(scmd);
return BLK_EH_HANDLED;
}
return BLK_EH_NOT_HANDLED;
}
/**
@ -1793,7 +1732,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
blk_rq_init(NULL, &req);
scmd->request = &req;
memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
scmd->cmnd = req.cmd;
@ -1804,8 +1742,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
scmd->sc_data_direction = DMA_BIDIRECTIONAL;
init_timer(&scmd->eh_timeout);
spin_lock_irqsave(shost->host_lock, flags);
shost->tmf_in_progress = 1;
spin_unlock_irqrestore(shost->host_lock, flags);

17
drivers/scsi/scsi_lib.c
View File

@ -1181,7 +1181,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
cmd->transfersize = req->data_len;
cmd->allowed = req->retries;
cmd->timeout_per_command = req->timeout;
return BLKPREP_OK;
}
EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);
@ -1416,17 +1415,26 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
spin_unlock(shost->host_lock);
spin_lock(sdev->request_queue->queue_lock);
__scsi_done(cmd);
blk_complete_request(req);
}
static void scsi_softirq_done(struct request *rq)
{
struct scsi_cmnd *cmd = rq->completion_data;
unsigned long wait_for = (cmd->allowed + 1) * cmd->timeout_per_command;
struct scsi_cmnd *cmd = rq->special;
unsigned long wait_for = (cmd->allowed + 1) * rq->timeout;
int disposition;
INIT_LIST_HEAD(&cmd->eh_entry);
/*
* Set the serial numbers back to zero
*/
cmd->serial_number = 0;
atomic_inc(&cmd->device->iodone_cnt);
if (cmd->result)
atomic_inc(&cmd->device->ioerr_cnt);
disposition = scsi_decide_disposition(cmd);
if (disposition != SUCCESS &&
time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) {
@ -1675,6 +1683,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
blk_queue_prep_rq(q, scsi_prep_fn);
blk_queue_softirq_done(q, scsi_softirq_done);
blk_queue_rq_timed_out(q, scsi_times_out);
return q;
}

7
drivers/scsi/scsi_priv.h
View File

@ -4,6 +4,7 @@
#include <linux/device.h>
struct request_queue;
struct request;
struct scsi_cmnd;
struct scsi_device;
struct scsi_host_template;
@ -27,7 +28,6 @@ extern void scsi_exit_hosts(void);
extern int scsi_dispatch_cmd(struct scsi_cmnd *cmd);
extern int scsi_setup_command_freelist(struct Scsi_Host *shost);
extern void scsi_destroy_command_freelist(struct Scsi_Host *shost);
extern void __scsi_done(struct scsi_cmnd *cmd);
#ifdef CONFIG_SCSI_LOGGING
void scsi_log_send(struct scsi_cmnd *cmd);
void scsi_log_completion(struct scsi_cmnd *cmd, int disposition);
@ -49,10 +49,7 @@ extern int __init scsi_init_devinfo(void);
extern void scsi_exit_devinfo(void);
/* scsi_error.c */
extern void scsi_add_timer(struct scsi_cmnd *, int,
void (*)(struct scsi_cmnd *));
extern int scsi_delete_timer(struct scsi_cmnd *);
extern void scsi_times_out(struct scsi_cmnd *cmd);
extern enum blk_eh_timer_return scsi_times_out(struct request *req);
extern int scsi_error_handler(void *host);
extern int scsi_decide_disposition(struct scsi_cmnd *cmd);
extern void scsi_eh_wakeup(struct Scsi_Host *shost);

7
drivers/scsi/scsi_sysfs.c
View File

@ -560,12 +560,15 @@ sdev_rd_attr (vendor, "%.8s\n");
sdev_rd_attr (model, "%.16s\n");
sdev_rd_attr (rev, "%.4s\n");
/*
* TODO: can we make these symlinks to the block layer ones?
*/
static ssize_t
sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
}
static ssize_t
@ -576,7 +579,7 @@ sdev_store_timeout (struct device *dev, struct device_attribute *attr,
int timeout;
sdev = to_scsi_device(dev);
sscanf (buf, "%d\n", &timeout);
sdev->timeout = timeout * HZ;
blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
return count;
}
static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);

6
drivers/scsi/scsi_transport_fc.c
View File

@ -1950,15 +1950,15 @@ static int fc_vport_match(struct attribute_container *cont,
* Notes:
* This routine assumes no locks are held on entry.
*/
static enum scsi_eh_timer_return
static enum blk_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
if (rport->port_state == FC_PORTSTATE_BLOCKED)
return EH_RESET_TIMER;
return BLK_EH_RESET_TIMER;
return EH_NOT_HANDLED;
return BLK_EH_NOT_HANDLED;
}
/*

9
drivers/scsi/sd.c
View File

@ -383,7 +383,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
sector_t block = rq->sector;
sector_t threshold;
unsigned int this_count = rq->nr_sectors;
unsigned int timeout = sdp->timeout;
int ret;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
@ -584,7 +583,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->transfersize = sdp->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = SD_MAX_RETRIES;
SCpnt->timeout_per_command = timeout;
/*
* This indicates that the command is ready from our end to be
@ -1878,11 +1876,12 @@ static int sd_probe(struct device *dev)
sdkp->openers = 0;
sdkp->previous_state = 1;
if (!sdp->timeout) {
if (!sdp->request_queue->rq_timeout) {
if (sdp->type != TYPE_MOD)
sdp->timeout = SD_TIMEOUT;
blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
else
sdp->timeout = SD_MOD_TIMEOUT;
blk_queue_rq_timeout(sdp->request_queue,
SD_MOD_TIMEOUT);
}
device_initialize(&sdkp->dev);

5
drivers/scsi/sr.c
View File

@ -331,7 +331,7 @@ static int sr_done(struct scsi_cmnd *SCpnt)
static int sr_prep_fn(struct request_queue *q, struct request *rq)
{
int block=0, this_count, s_size, timeout = SR_TIMEOUT;
int block = 0, this_count, s_size;
struct scsi_cd *cd;
struct scsi_cmnd *SCpnt;
struct scsi_device *sdp = q->queuedata;
@ -461,7 +461,6 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->transfersize = cd->device->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = MAX_RETRIES;
SCpnt->timeout_per_command = timeout;
/*
* This indicates that the command is ready from our end to be
@ -620,6 +619,8 @@ static int sr_probe(struct device *dev)
disk->fops = &sr_bdops;
disk->flags = GENHD_FL_CD;
blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
cd->device = sdev;
cd->disk = disk;
cd->driver = &sr_template;

4
drivers/scsi/sym53c8xx_2/sym_glue.c
View File

@ -519,8 +519,8 @@ static int sym53c8xx_queue_command(struct scsi_cmnd *cmd,
* Shorten our settle_time if needed for
* this command not to time out.
*/
if (np->s.settle_time_valid && cmd->timeout_per_command) {
unsigned long tlimit = jiffies + cmd->timeout_per_command;
if (np->s.settle_time_valid && cmd->request->timeout) {
unsigned long tlimit = jiffies + cmd->request->timeout;
tlimit -= SYM_CONF_TIMER_INTERVAL*2;
if (time_after(np->s.settle_time, tlimit)) {
np->s.settle_time = tlimit;

20
include/linux/blkdev.h
View File

@ -147,6 +147,7 @@ struct request {
unsigned int cmd_flags;
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
/* Maintain bio traversal state for part by part I/O submission.
* hard_* are block layer internals, no driver should touch them!
@ -214,6 +215,8 @@ struct request {
void *data;
void *sense;
unsigned long deadline;
struct list_head timeout_list;
unsigned int timeout;
int retries;
@ -266,6 +269,14 @@ typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
enum blk_eh_timer_return {
BLK_EH_NOT_HANDLED,
BLK_EH_HANDLED,
BLK_EH_RESET_TIMER,
};
typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
enum blk_queue_state {
Queue_down,
Queue_up,
@ -311,6 +322,7 @@ struct request_queue
merge_bvec_fn *merge_bvec_fn;
prepare_flush_fn *prepare_flush_fn;
softirq_done_fn *softirq_done_fn;
rq_timed_out_fn *rq_timed_out_fn;
dma_drain_needed_fn *dma_drain_needed;
/*
@ -386,6 +398,10 @@ struct request_queue
unsigned int nr_sorted;
unsigned int in_flight;
unsigned int rq_timeout;
struct timer_list timeout;
struct list_head timeout_list;
/*
* sg stuff
*/
@ -770,6 +786,8 @@ extern int blk_end_request_callback(struct request *rq, int error,
unsigned int nr_bytes,
int (drv_callback)(struct request *));
extern void blk_complete_request(struct request *);
extern void __blk_complete_request(struct request *);
extern void blk_abort_request(struct request *);
/*
* blk_end_request() takes bytes instead of sectors as a complete size.
@ -811,6 +829,8 @@ extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *);
extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
extern int blk_do_ordered(struct request_queue *, struct request **);

3
include/scsi/scsi_cmnd.h
View File

@ -75,7 +75,6 @@ struct scsi_cmnd {
int retries;
int allowed;
int timeout_per_command;
unsigned char prot_op;
unsigned char prot_type;
@ -86,7 +85,6 @@ struct scsi_cmnd {
/* These elements define the operation we are about to perform */
unsigned char *cmnd;
struct timer_list eh_timeout; /* Used to time out the command. */
/* These elements define the operation we ultimately want to perform */
struct scsi_data_buffer sdb;
@ -139,7 +137,6 @@ extern void scsi_put_command(struct scsi_cmnd *);
extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
struct device *);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);
extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
size_t *offset, size_t *len);

9
include/scsi/scsi_host.h
View File

@ -43,13 +43,6 @@ struct blk_queue_tags;
#define DISABLE_CLUSTERING 0
#define ENABLE_CLUSTERING 1
enum scsi_eh_timer_return {
EH_NOT_HANDLED,
EH_HANDLED,
EH_RESET_TIMER,
};
struct scsi_host_template {
struct module *module;
const char *name;
@ -347,7 +340,7 @@ struct scsi_host_template {
*
* Status: OPTIONAL
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/*
* Name of proc directory

3
include/scsi/scsi_transport.h
View File

@ -21,6 +21,7 @@
#define SCSI_TRANSPORT_H
#include <linux/transport_class.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
@ -64,7 +65,7 @@ struct scsi_transport_template {
* begin counting again
* EH_NOT_HANDLED Begin normal error recovery
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/*
* Used as callback for the completion of i_t_nexus request