#include <linux/time.h>
#include <linux/workqueue.h>
#include <scsi/scsi_dh.h>
-#include <scsi/scsi_eh.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#define DM_MSG_PREFIX "multipath"
-#define MESG_STR(x) x, sizeof(x)
+#define DM_PG_INIT_DELAY_MSECS 2000
+#define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1)
/* Path properties */
struct pgpath {
unsigned fail_count; /* Cumulative failure count */
struct dm_path path;
- struct work_struct deactivate_path;
- struct work_struct activate_path;
+ struct delayed_work activate_path;
};
#define path_to_pgpath(__pgp) container_of((__pgp), struct pgpath, path)
const char *hw_handler_name;
char *hw_handler_params;
+
unsigned nr_priority_groups;
struct list_head priority_groups;
+
+ wait_queue_head_t pg_init_wait; /* Wait for pg_init completion */
+
unsigned pg_init_required; /* pg_init needs calling? */
unsigned pg_init_in_progress; /* Only one pg_init allowed at once */
+ unsigned pg_init_delay_retry; /* Delay pg_init retry? */
unsigned nr_valid_paths; /* Total number of usable paths */
struct pgpath *current_pgpath;
unsigned saved_queue_if_no_path;/* Saved state during suspension */
unsigned pg_init_retries; /* Number of times to retry pg_init */
unsigned pg_init_count; /* Number of times pg_init called */
+ unsigned pg_init_delay_msecs; /* Number of msecs before pg_init retry */
unsigned features; /* Additional selected features */
struct work_struct process_queued_ios;
mempool_t *mpio_pool;
struct mutex work_mutex;
-
- unsigned suspended; /* Don't create new I/O internally when set. */
};
/*
struct dm_mpath_io {
struct pgpath *pgpath;
size_t nr_bytes;
- char sense[SCSI_SENSE_BUFFERSIZE];
};
typedef int (*action_fn) (struct pgpath *pgpath);
static void process_queued_ios(struct work_struct *work);
static void trigger_event(struct work_struct *work);
static void activate_path(struct work_struct *work);
-static void deactivate_path(struct work_struct *work);
/*-----------------------------------------------
if (pgpath) {
pgpath->is_active = 1;
- INIT_WORK(&pgpath->deactivate_path, deactivate_path);
- INIT_WORK(&pgpath->activate_path, activate_path);
+ INIT_DELAYED_WORK(&pgpath->activate_path, activate_path);
}
return pgpath;
kfree(pgpath);
}
-static void deactivate_path(struct work_struct *work)
-{
- struct pgpath *pgpath =
- container_of(work, struct pgpath, deactivate_path);
-
- if (pgpath->path.dev)
- blk_abort_queue(pgpath->path.dev->bdev->bd_disk->queue);
-}
-
static struct priority_group *alloc_priority_group(void)
{
struct priority_group *pg;
static void free_pgpaths(struct list_head *pgpaths, struct dm_target *ti)
{
struct pgpath *pgpath, *tmp;
- struct multipath *m = ti->private;
list_for_each_entry_safe(pgpath, tmp, pgpaths, list) {
list_del(&pgpath->list);
INIT_LIST_HEAD(&m->queued_ios);
spin_lock_init(&m->lock);
m->queue_io = 1;
+ m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT;
INIT_WORK(&m->process_queued_ios, process_queued_ios);
INIT_WORK(&m->trigger_event, trigger_event);
+ init_waitqueue_head(&m->pg_init_wait);
mutex_init(&m->work_mutex);
m->mpio_pool = mempool_create_slab_pool(MIN_IOS, _mpio_cache);
if (!m->mpio_pool) {
kfree(m);
}
+static int set_mapinfo(struct multipath *m, union map_info *info)
+{
+ struct dm_mpath_io *mpio;
+
+ mpio = mempool_alloc(m->mpio_pool, GFP_ATOMIC);
+ if (!mpio)
+ return -ENOMEM;
+
+ memset(mpio, 0, sizeof(*mpio));
+ info->ptr = mpio;
+
+ return 0;
+}
+
+static void clear_mapinfo(struct multipath *m, union map_info *info)
+{
+ struct dm_mpath_io *mpio = info->ptr;
+
+ info->ptr = NULL;
+ mempool_free(mpio, m->mpio_pool);
+}
/*-----------------------------------------------
* Path selection
*-----------------------------------------------*/
+static void __pg_init_all_paths(struct multipath *m)
+{
+ struct pgpath *pgpath;
+ unsigned long pg_init_delay = 0;
+
+ m->pg_init_count++;
+ m->pg_init_required = 0;
+ if (m->pg_init_delay_retry)
+ pg_init_delay = msecs_to_jiffies(m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT ?
+ m->pg_init_delay_msecs : DM_PG_INIT_DELAY_MSECS);
+ list_for_each_entry(pgpath, &m->current_pg->pgpaths, list) {
+ /* Skip failed paths */
+ if (!pgpath->is_active)
+ continue;
+ if (queue_delayed_work(kmpath_handlerd, &pgpath->activate_path,
+ pg_init_delay))
+ m->pg_init_in_progress++;
+ }
+}
+
static void __switch_pg(struct multipath *m, struct pgpath *pgpath)
{
m->current_pg = pgpath->pg;
}
static int map_io(struct multipath *m, struct request *clone,
- struct dm_mpath_io *mpio, unsigned was_queued)
+ union map_info *map_context, unsigned was_queued)
{
int r = DM_MAPIO_REMAPPED;
size_t nr_bytes = blk_rq_bytes(clone);
unsigned long flags;
struct pgpath *pgpath;
struct block_device *bdev;
+ struct dm_mpath_io *mpio = map_context->ptr;
spin_lock_irqsave(&m->lock, flags);
{
int r;
unsigned long flags;
- struct dm_mpath_io *mpio;
union map_info *info;
struct request *clone, *n;
LIST_HEAD(cl);
list_del_init(&clone->queuelist);
info = dm_get_rq_mapinfo(clone);
- mpio = info->ptr;
- r = map_io(m, clone, mpio, 1);
+ r = map_io(m, clone, info, 1);
if (r < 0) {
- mempool_free(mpio, m->mpio_pool);
+ clear_mapinfo(m, info);
dm_kill_unmapped_request(clone, r);
} else if (r == DM_MAPIO_REMAPPED)
dm_dispatch_request(clone);
else if (r == DM_MAPIO_REQUEUE) {
- mempool_free(mpio, m->mpio_pool);
+ clear_mapinfo(m, info);
dm_requeue_unmapped_request(clone);
}
}
{
struct multipath *m =
container_of(work, struct multipath, process_queued_ios);
- struct pgpath *pgpath = NULL, *tmp;
+ struct pgpath *pgpath = NULL;
unsigned must_queue = 1;
unsigned long flags;
(!pgpath && !m->queue_if_no_path))
must_queue = 0;
- if (m->pg_init_required && !m->pg_init_in_progress && pgpath) {
- m->pg_init_count++;
- m->pg_init_required = 0;
- list_for_each_entry(tmp, &pgpath->pg->pgpaths, list) {
- /* Skip disabled paths or failed paths */
- if (!tmp->path.dev || !tmp->is_active)
- continue;
- if (queue_work(kmpath_handlerd, &tmp->activate_path))
- m->pg_init_in_progress++;
- }
- }
+ if (m->pg_init_required && !m->pg_init_in_progress && pgpath)
+ __pg_init_all_paths(m);
+
out:
spin_unlock_irqrestore(&m->lock, flags);
if (!must_queue)
* <#paths> <#per-path selector args>
* [<path> [<arg>]* ]+ ]+
*---------------------------------------------------------------*/
-struct param {
- unsigned min;
- unsigned max;
- char *error;
-};
-
-static int read_param(struct param *param, char *str, unsigned *v, char **error)
-{
- if (!str ||
- (sscanf(str, "%u", v) != 1) ||
- (*v < param->min) ||
- (*v > param->max)) {
- *error = param->error;
- return -EINVAL;
- }
-
- return 0;
-}
-
-struct arg_set {
- unsigned argc;
- char **argv;
-};
-
-static char *shift(struct arg_set *as)
-{
- char *r;
-
- if (as->argc) {
- as->argc--;
- r = *as->argv;
- as->argv++;
- return r;
- }
-
- return NULL;
-}
-
-static void consume(struct arg_set *as, unsigned n)
-{
- BUG_ON (as->argc < n);
- as->argc -= n;
- as->argv += n;
-}
-
-static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
+static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
struct dm_target *ti)
{
int r;
struct path_selector_type *pst;
unsigned ps_argc;
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of path selector args"},
};
- pst = dm_get_path_selector(shift(as));
+ pst = dm_get_path_selector(dm_shift_arg(as));
if (!pst) {
ti->error = "unknown path selector type";
return -EINVAL;
}
- r = read_param(_params, shift(as), &ps_argc, &ti->error);
+ r = dm_read_arg_group(_args, as, &ps_argc, &ti->error);
if (r) {
dm_put_path_selector(pst);
return -EINVAL;
}
- if (ps_argc > as->argc) {
- dm_put_path_selector(pst);
- ti->error = "not enough arguments for path selector";
- return -EINVAL;
- }
-
r = pst->create(&pg->ps, ps_argc, as->argv);
if (r) {
dm_put_path_selector(pst);
}
pg->ps.type = pst;
- consume(as, ps_argc);
+ dm_consume_args(as, ps_argc);
return 0;
}
-static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
+static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps,
struct dm_target *ti)
{
int r;
if (!p)
return ERR_PTR(-ENOMEM);
- path = shift(as);
- r = dm_get_device(ti, path, ti->begin, ti->len,
- dm_table_get_mode(ti->table), &p->path.dev);
+ path = dm_shift_arg(as);
+ r = dm_get_device(ti, path, dm_table_get_mode(ti->table),
+ &p->path.dev);
if (r) {
unsigned major, minor;
return ERR_PTR(r);
}
-static struct priority_group *parse_priority_group(struct arg_set *as,
+static struct priority_group *parse_priority_group(struct dm_arg_set *as,
struct multipath *m)
{
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{1, 1024, "invalid number of paths"},
{0, 1024, "invalid number of selector args"}
};
int r;
- unsigned i, nr_selector_args, nr_params;
+ unsigned i, nr_selector_args, nr_args;
struct priority_group *pg;
struct dm_target *ti = m->ti;
/*
* read the paths
*/
- r = read_param(_params, shift(as), &pg->nr_pgpaths, &ti->error);
+ r = dm_read_arg(_args, as, &pg->nr_pgpaths, &ti->error);
if (r)
goto bad;
- r = read_param(_params + 1, shift(as), &nr_selector_args, &ti->error);
+ r = dm_read_arg(_args + 1, as, &nr_selector_args, &ti->error);
if (r)
goto bad;
- nr_params = 1 + nr_selector_args;
+ nr_args = 1 + nr_selector_args;
for (i = 0; i < pg->nr_pgpaths; i++) {
struct pgpath *pgpath;
- struct arg_set path_args;
+ struct dm_arg_set path_args;
- if (as->argc < nr_params) {
+ if (as->argc < nr_args) {
ti->error = "not enough path parameters";
+ r = -EINVAL;
goto bad;
}
- path_args.argc = nr_params;
+ path_args.argc = nr_args;
path_args.argv = as->argv;
pgpath = parse_path(&path_args, &pg->ps, ti);
pgpath->pg = pg;
list_add_tail(&pgpath->list, &pg->pgpaths);
- consume(as, nr_params);
+ dm_consume_args(as, nr_args);
}
return pg;
return ERR_PTR(r);
}
-static int parse_hw_handler(struct arg_set *as, struct multipath *m)
+static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
{
unsigned hw_argc;
int ret;
struct dm_target *ti = m->ti;
- static struct param _params[] = {
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of hardware handler args"},
};
- if (read_param(_params, shift(as), &hw_argc, &ti->error))
+ if (dm_read_arg_group(_args, as, &hw_argc, &ti->error))
return -EINVAL;
if (!hw_argc)
return 0;
- if (hw_argc > as->argc) {
- ti->error = "not enough arguments for hardware handler";
- return -EINVAL;
- }
-
- m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL);
- request_module("scsi_dh_%s", m->hw_handler_name);
- if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
+ m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
+ if (!try_then_request_module(scsi_dh_handler_exist(m->hw_handler_name),
+ "scsi_dh_%s", m->hw_handler_name)) {
ti->error = "unknown hardware handler type";
ret = -EINVAL;
goto fail;
for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1)
j = sprintf(p, "%s", as->argv[i]);
}
- consume(as, hw_argc - 1);
+ dm_consume_args(as, hw_argc - 1);
return 0;
fail:
return ret;
}
-static int parse_features(struct arg_set *as, struct multipath *m)
+static int parse_features(struct dm_arg_set *as, struct multipath *m)
{
int r;
unsigned argc;
struct dm_target *ti = m->ti;
- const char *param_name;
+ const char *arg_name;
- static struct param _params[] = {
- {0, 3, "invalid number of feature args"},
+ static struct dm_arg _args[] = {
+ {0, 5, "invalid number of feature args"},
{1, 50, "pg_init_retries must be between 1 and 50"},
+ {0, 60000, "pg_init_delay_msecs must be between 0 and 60000"},
};
- r = read_param(_params, shift(as), &argc, &ti->error);
+ r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return -EINVAL;
return 0;
do {
- param_name = shift(as);
+ arg_name = dm_shift_arg(as);
argc--;
- if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) {
+ if (!strcasecmp(arg_name, "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
continue;
}
- if (!strnicmp(param_name, MESG_STR("no_partitions"))) {
+ if (!strcasecmp(arg_name, "no_partitions")) {
m->features |= FEATURE_NO_PARTITIONS;
continue;
}
- if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
+ if (!strcasecmp(arg_name, "pg_init_retries") &&
+ (argc >= 1)) {
+ r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error);
+ argc--;
+ continue;
+ }
+
+ if (!strcasecmp(arg_name, "pg_init_delay_msecs") &&
(argc >= 1)) {
- r = read_param(_params + 1, shift(as),
- &m->pg_init_retries, &ti->error);
+ r = dm_read_arg(_args + 2, as, &m->pg_init_delay_msecs, &ti->error);
argc--;
continue;
}
static int multipath_ctr(struct dm_target *ti, unsigned int argc,
char **argv)
{
- /* target parameters */
- static struct param _params[] = {
+ /* target arguments */
+ static struct dm_arg _args[] = {
{0, 1024, "invalid number of priority groups"},
{0, 1024, "invalid initial priority group number"},
};
int r;
struct multipath *m;
- struct arg_set as;
+ struct dm_arg_set as;
unsigned pg_count = 0;
unsigned next_pg_num;
if (r)
goto bad;
- r = read_param(_params, shift(&as), &m->nr_priority_groups, &ti->error);
+ r = dm_read_arg(_args, &as, &m->nr_priority_groups, &ti->error);
if (r)
goto bad;
- r = read_param(_params + 1, shift(&as), &next_pg_num, &ti->error);
+ r = dm_read_arg(_args + 1, &as, &next_pg_num, &ti->error);
if (r)
goto bad;
+ if ((!m->nr_priority_groups && next_pg_num) ||
+ (m->nr_priority_groups && !next_pg_num)) {
+ ti->error = "invalid initial priority group";
+ r = -EINVAL;
+ goto bad;
+ }
+
/* parse the priority groups */
while (as.argc) {
struct priority_group *pg;
}
ti->num_flush_requests = 1;
+ ti->num_discard_requests = 1;
return 0;
return r;
}
-static void flush_multipath_work(void)
+static void multipath_wait_for_pg_init_completion(struct multipath *m)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ unsigned long flags;
+
+ add_wait_queue(&m->pg_init_wait, &wait);
+
+ while (1) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+
+ spin_lock_irqsave(&m->lock, flags);
+ if (!m->pg_init_in_progress) {
+ spin_unlock_irqrestore(&m->lock, flags);
+ break;
+ }
+ spin_unlock_irqrestore(&m->lock, flags);
+
+ io_schedule();
+ }
+ set_current_state(TASK_RUNNING);
+
+ remove_wait_queue(&m->pg_init_wait, &wait);
+}
+
+static void flush_multipath_work(struct multipath *m)
{
flush_workqueue(kmpath_handlerd);
+ multipath_wait_for_pg_init_completion(m);
flush_workqueue(kmultipathd);
- flush_scheduled_work();
+ flush_work_sync(&m->trigger_event);
}
static void multipath_dtr(struct dm_target *ti)
{
struct multipath *m = ti->private;
- flush_multipath_work();
+ flush_multipath_work(m);
free_multipath(m);
}
union map_info *map_context)
{
int r;
- struct dm_mpath_io *mpio;
struct multipath *m = (struct multipath *) ti->private;
- mpio = mempool_alloc(m->mpio_pool, GFP_ATOMIC);
- if (!mpio)
+ if (set_mapinfo(m, map_context) < 0)
/* ENOMEM, requeue */
return DM_MAPIO_REQUEUE;
- memset(mpio, 0, sizeof(*mpio));
- map_context->ptr = mpio;
clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
- /* Always attach a sense buffer */
- if (!clone->sense)
- clone->sense = mpio->sense;
- r = map_io(m, clone, mpio, 0);
+ r = map_io(m, clone, map_context, 0);
if (r < 0 || r == DM_MAPIO_REQUEUE)
- mempool_free(mpio, m->mpio_pool);
+ clear_mapinfo(m, map_context);
return r;
}
pgpath->path.pdev, m->nr_valid_paths);
schedule_work(&m->trigger_event);
- queue_work(kmultipathd, &pgpath->deactivate_path);
out:
spin_unlock_irqrestore(&m->lock, flags);
m->current_pgpath = NULL;
queue_work(kmultipathd, &m->process_queued_ios);
} else if (m->hw_handler_name && (m->current_pg == pgpath->pg)) {
- if (queue_work(kmpath_handlerd, &pgpath->activate_path))
+ if (queue_work(kmpath_handlerd, &pgpath->activate_path.work))
m->pg_init_in_progress++;
}
static int action_dev(struct multipath *m, struct dm_dev *dev,
action_fn action)
{
- int r = 0;
+ int r = -EINVAL;
struct pgpath *pgpath;
struct priority_group *pg;
struct priority_group *pg;
unsigned pgnum;
unsigned long flags;
+ char dummy;
- if (!pgstr || (sscanf(pgstr, "%u", &pgnum) != 1) || !pgnum ||
+ if (!pgstr || (sscanf(pgstr, "%u%c", &pgnum, &dummy) != 1) || !pgnum ||
(pgnum > m->nr_priority_groups)) {
DMWARN("invalid PG number supplied to switch_pg_num");
return -EINVAL;
{
struct priority_group *pg;
unsigned pgnum;
+ char dummy;
- if (!pgstr || (sscanf(pgstr, "%u", &pgnum) != 1) || !pgnum ||
+ if (!pgstr || (sscanf(pgstr, "%u%c", &pgnum, &dummy) != 1) || !pgnum ||
(pgnum > m->nr_priority_groups)) {
DMWARN("invalid PG number supplied to bypass_pg");
return -EINVAL;
static void pg_init_done(void *data, int errors)
{
- struct dm_path *path = data;
- struct pgpath *pgpath = path_to_pgpath(path);
+ struct pgpath *pgpath = data;
struct priority_group *pg = pgpath->pg;
struct multipath *m = pg->m;
unsigned long flags;
+ unsigned delay_retry = 0;
/* device or driver problems */
switch (errors) {
errors = 0;
break;
}
- DMERR("Cannot failover device %s because scsi_dh_%s was not "
- "loaded.", pgpath->path.pdev, m->hw_handler_name);
+ DMERR("Count not failover device %s: Handler scsi_dh_%s "
+ "was not loaded.", pgpath->path.dev->name,
+ m->hw_handler_name);
/*
* Fail path for now, so we do not ping pong
*/
bypass_pg(m, pg, 1);
break;
case SCSI_DH_DEV_OFFLINED:
- DMWARN("Device %s offlined.", pgpath->path.pdev);
+ DMWARN("Device %s offlined.", pgpath->path.dev->name);
errors = 0;
break;
- /* TODO: For SCSI_DH_RETRY we should wait a couple seconds */
case SCSI_DH_RETRY:
+ /* Wait before retrying. */
+ delay_retry = 1;
case SCSI_DH_IMM_RETRY:
case SCSI_DH_RES_TEMP_UNAVAIL:
if (pg_init_limit_reached(m, pgpath))
if (errors) {
if (pgpath == m->current_pgpath) {
DMERR("Could not failover device %s, error %d.",
- pgpath->path.pdev, errors);
+ pgpath->path.dev->name, errors);
m->current_pgpath = NULL;
m->current_pg = NULL;
}
- } else if (!m->pg_init_required) {
- m->queue_io = 0;
+ } else if (!m->pg_init_required)
pg->bypassed = 0;
- }
- m->pg_init_in_progress--;
- if (!m->pg_init_in_progress)
- queue_work(kmultipathd, &m->process_queued_ios);
+ if (--m->pg_init_in_progress)
+ /* Activations of other paths are still on going */
+ goto out;
+
+ if (!m->pg_init_required)
+ m->queue_io = 0;
+
+ m->pg_init_delay_retry = delay_retry;
+ queue_work(kmultipathd, &m->process_queued_ios);
+
+ /*
+ * Wake up any thread waiting to suspend.
+ */
+ wake_up(&m->pg_init_wait);
+
+out:
spin_unlock_irqrestore(&m->lock, flags);
}
static void activate_path(struct work_struct *work)
{
struct pgpath *pgpath =
- container_of(work, struct pgpath, activate_path);
+ container_of(work, struct pgpath, activate_path.work);
if (pgpath->path.dev)
scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev),
- pg_init_done, &pgpath->path);
-}
-
-/*
- * Evaluate scsi return code
- */
-static int eval_scsi_error(int result, char *sense, int sense_len)
-{
- struct scsi_sense_hdr sshdr;
- int r = DM_ENDIO_REQUEUE;
-
- if (host_byte(result) != DID_OK)
- return r;
-
- if (msg_byte(result) != COMMAND_COMPLETE)
- return r;
-
- if (status_byte(result) == RESERVATION_CONFLICT)
- /* Do not retry here, possible data corruption */
- return -EIO;
-
-#if defined(CONFIG_SCSI) || defined(CONFIG_SCSI_MODULE)
- if (status_byte(result) == CHECK_CONDITION &&
- !scsi_normalize_sense(sense, sense_len, &sshdr)) {
-
- switch (sshdr.sense_key) {
- case MEDIUM_ERROR:
- case DATA_PROTECT:
- case BLANK_CHECK:
- case COPY_ABORTED:
- case VOLUME_OVERFLOW:
- case MISCOMPARE:
- r = -EIO;
- break;
- }
- }
-#endif
-
- return r;
+ pg_init_done, pgpath);
}
/*
if (!error && !clone->errors)
return 0; /* I/O complete */
- if (error == -EOPNOTSUPP)
+ if (error == -EOPNOTSUPP || error == -EREMOTEIO || error == -EILSEQ)
return error;
- r = eval_scsi_error(clone->errors, clone->sense, clone->sense_len);
- if (r != DM_ENDIO_REQUEUE)
- return r;
-
if (mpio->pgpath)
fail_path(mpio->pgpath);
spin_lock_irqsave(&m->lock, flags);
- if (!m->nr_valid_paths && !m->queue_if_no_path && !__must_push_back(m))
- r = -EIO;
+ if (!m->nr_valid_paths) {
+ if (!m->queue_if_no_path) {
+ if (!__must_push_back(m))
+ r = -EIO;
+ } else {
+ if (error == -EBADE)
+ r = error;
+ }
+ }
spin_unlock_irqrestore(&m->lock, flags);
return r;
struct path_selector *ps;
int r;
+ BUG_ON(!mpio);
+
r = do_end_io(m, clone, error, mpio);
if (pgpath) {
ps = &pgpath->pg->ps;
if (ps->type->end_io)
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
}
- if (clone->sense == mpio->sense) {
- clone->sense = NULL;
- clone->sense_len = 0;
- }
- mempool_free(mpio, m->mpio_pool);
+ clear_mapinfo(m, map_context);
return r;
}
struct multipath *m = ti->private;
mutex_lock(&m->work_mutex);
- m->suspended = 1;
- flush_multipath_work();
+ flush_multipath_work(m);
mutex_unlock(&m->work_mutex);
}
struct multipath *m = (struct multipath *) ti->private;
unsigned long flags;
- mutex_lock(&m->work_mutex);
- m->suspended = 0;
- mutex_unlock(&m->work_mutex);
-
spin_lock_irqsave(&m->lock, flags);
m->queue_if_no_path = m->saved_queue_if_no_path;
spin_unlock_irqrestore(&m->lock, flags);
else {
DMEMIT("%u ", m->queue_if_no_path +
(m->pg_init_retries > 0) * 2 +
+ (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) * 2 +
(m->features & FEATURE_NO_PARTITIONS));
if (m->queue_if_no_path)
DMEMIT("queue_if_no_path ");
DMEMIT("pg_init_retries %u ", m->pg_init_retries);
if (m->features & FEATURE_NO_PARTITIONS)
DMEMIT("no_partitions ");
+ if (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT)
+ DMEMIT("pg_init_delay_msecs %u ", m->pg_init_delay_msecs);
}
if (!m->hw_handler_name || type == STATUSTYPE_INFO)
else if (m->current_pg)
pg_num = m->current_pg->pg_num;
else
- pg_num = 1;
+ pg_num = (m->nr_priority_groups ? 1 : 0);
DMEMIT("%u ", pg_num);
mutex_lock(&m->work_mutex);
- if (m->suspended) {
- r = -EBUSY;
- goto out;
- }
-
if (dm_suspended(ti)) {
r = -EBUSY;
goto out;
}
if (argc == 1) {
- if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
+ if (!strcasecmp(argv[0], "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) {
+ } else if (!strcasecmp(argv[0], "fail_if_no_path")) {
r = queue_if_no_path(m, 0, 0);
goto out;
}
goto out;
}
- if (!strnicmp(argv[0], MESG_STR("disable_group"))) {
+ if (!strcasecmp(argv[0], "disable_group")) {
r = bypass_pg_num(m, argv[1], 1);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("enable_group"))) {
+ } else if (!strcasecmp(argv[0], "enable_group")) {
r = bypass_pg_num(m, argv[1], 0);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("switch_group"))) {
+ } else if (!strcasecmp(argv[0], "switch_group")) {
r = switch_pg_num(m, argv[1]);
goto out;
- } else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
+ } else if (!strcasecmp(argv[0], "reinstate_path"))
action = reinstate_path;
- else if (!strnicmp(argv[0], MESG_STR("fail_path")))
+ else if (!strcasecmp(argv[0], "fail_path"))
action = fail_path;
else {
DMWARN("Unrecognised multipath message received.");
goto out;
}
- r = dm_get_device(ti, argv[1], ti->begin, ti->len,
- dm_table_get_mode(ti->table), &dev);
+ r = dm_get_device(ti, argv[1], dm_table_get_mode(ti->table), &dev);
if (r) {
DMWARN("message: error getting device %s",
argv[1]);
spin_unlock_irqrestore(&m->lock, flags);
+ /*
+ * Only pass ioctls through if the device sizes match exactly.
+ */
+ if (!r && ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT)
+ r = scsi_verify_blk_ioctl(NULL, cmd);
+
return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 1, 1},
+ .version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
return -EINVAL;
}
- kmultipathd = create_workqueue("kmpathd");
+ kmultipathd = alloc_workqueue("kmpathd", WQ_MEM_RECLAIM, 0);
if (!kmultipathd) {
DMERR("failed to create workqueue kmpathd");
dm_unregister_target(&multipath_target);
* old workqueue would also create a bottleneck in the
* path of the storage hardware device activation.
*/
- kmpath_handlerd = create_singlethread_workqueue("kmpath_handlerd");
+ kmpath_handlerd = alloc_ordered_workqueue("kmpath_handlerd",
+ WQ_MEM_RECLAIM);
if (!kmpath_handlerd) {
DMERR("failed to create workqueue kmpath_handlerd");
destroy_workqueue(kmultipathd);
projects / linux-flexiantxendom0-3.2.10.git / blobdiff