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);
- if (m->hw_handler_name)
- scsi_dh_detach(bdev_get_queue(pgpath->path.dev->bdev));
dm_put_device(ti, pgpath->path.dev);
free_pgpath(pgpath);
}
q = bdev_get_queue(p->path.dev->bdev);
if (m->retain_attached_hw_handler) {
+retain:
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
/*
}
if (m->hw_handler_name) {
- /*
- * Increments scsi_dh reference, even when using an
- * already-attached handler.
- */
r = scsi_dh_attach(q, m->hw_handler_name);
if (r == -EBUSY) {
- /*
- * Already attached to different hw_handler:
- * try to reattach with correct one.
- */
- scsi_dh_detach(q);
- r = scsi_dh_attach(q, m->hw_handler_name);
- }
+ char b[BDEVNAME_SIZE];
+ printk(KERN_INFO "dm-mpath: retaining handler on device %s\n",
+ bdevname(p->path.dev->bdev, b));
+ goto retain;
+ }
if (r < 0) {
ti->error = "error attaching hardware handler";
dm_put_device(ti, p->path.dev);
if (r < 0) {
ti->error = "unable to set hardware "
"handler parameters";
- scsi_dh_detach(q);
dm_put_device(ti, p->path.dev);
goto bad;
}
return 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;
- }
if (hw_argc > 1) {
char *p;
{
struct pgpath *pgpath =
container_of(work, struct pgpath, activate_path.work);
+ struct request_queue *q = bdev_get_queue(pgpath->path.dev->bdev);
- if (pgpath->is_active)
- scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev),
- pg_init_done, pgpath);
+ if (pgpath->is_active && !blk_queue_dying(q))
+ scsi_dh_activate(q, pg_init_done, pgpath);
else
pg_init_done(pgpath, SCSI_DH_DEV_OFFLINED);
}
return r;
}
-static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
- unsigned long arg)
+static int multipath_prepare_ioctl(struct dm_target *ti,
+ struct block_device **bdev, fmode_t *mode)
{
struct multipath *m = ti->private;
- struct pgpath *pgpath;
- struct block_device *bdev;
- fmode_t mode;
unsigned long flags;
int r;
- bdev = NULL;
- mode = 0;
- r = 0;
-
spin_lock_irqsave(&m->lock, flags);
if (!m->current_pgpath)
__choose_pgpath(m, 0);
- pgpath = m->current_pgpath;
-
- if (pgpath) {
- bdev = pgpath->path.dev->bdev;
- mode = pgpath->path.dev->mode;
+ if (m->current_pgpath) {
+ if (!m->queue_io) {
+ *bdev = m->current_pgpath->path.dev->bdev;
+ *mode = m->current_pgpath->path.dev->mode;
+ r = 0;
+ } else {
+ /* pg_init has not started or completed */
+ r = -ENOTCONN;
+ }
+ } else {
+ /* No path is available */
+ if (m->queue_if_no_path)
+ r = -ENOTCONN;
+ else
+ r = -EIO;
}
- if ((pgpath && m->queue_io) || (!pgpath && m->queue_if_no_path))
- r = -ENOTCONN;
- else if (!bdev)
- r = -EIO;
-
spin_unlock_irqrestore(&m->lock, flags);
- /*
- * Only pass ioctls through if the device sizes match exactly.
- */
- if (!bdev || ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT) {
- int err = scsi_verify_blk_ioctl(NULL, cmd);
- if (err)
- r = err;
- }
-
- if (r == -ENOTCONN && !fatal_signal_pending(current)) {
+ if (r == -ENOTCONN) {
spin_lock_irqsave(&m->lock, flags);
if (!m->current_pg) {
/* Path status changed, redo selection */
dm_table_run_md_queue_async(m->ti->table);
}
- return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ /*
+ * Only pass ioctls through if the device sizes match exactly.
+ */
+ if (!r && ti->len != i_size_read((*bdev)->bd_inode) >> SECTOR_SHIFT)
+ return 1;
+ return r;
}
static int multipath_iterate_devices(struct dm_target *ti,
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 9, 0},
+ .version = {1, 10, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,
- .ioctl = multipath_ioctl,
+ .prepare_ioctl = multipath_prepare_ioctl,
.iterate_devices = multipath_iterate_devices,
.busy = multipath_busy,
};