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-rw-r--r--drivers/md/dm-mpath.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 2469ba68dc2b..638dae048b4f 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/workqueue.h>
+#include <linux/delay.h>
#include <scsi/scsi_dh.h>
#include <linux/atomic.h>
@@ -486,9 +487,6 @@ static void process_queued_ios(struct work_struct *work)
spin_lock_irqsave(&m->lock, flags);
- if (!m->queue_size)
- goto out;
-
if (!m->current_pgpath)
__choose_pgpath(m, 0);
@@ -501,7 +499,6 @@ static void process_queued_ios(struct work_struct *work)
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)
dispatch_queued_ios(m);
@@ -1522,11 +1519,16 @@ out:
static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
unsigned long arg)
{
- struct multipath *m = (struct multipath *) ti->private;
- struct block_device *bdev = NULL;
- fmode_t mode = 0;
+ struct multipath *m = ti->private;
+ struct block_device *bdev;
+ fmode_t mode;
unsigned long flags;
- int r = 0;
+ int r;
+
+again:
+ bdev = NULL;
+ mode = 0;
+ r = 0;
spin_lock_irqsave(&m->lock, flags);
@@ -1551,6 +1553,12 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
if (!r && ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT)
r = scsi_verify_blk_ioctl(NULL, cmd);
+ if (r == -EAGAIN && !fatal_signal_pending(current)) {
+ queue_work(kmultipathd, &m->process_queued_ios);
+ msleep(10);
+ goto again;
+ }
+
return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
@@ -1648,7 +1656,7 @@ out:
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 3, 0},
+ .version = {1, 4, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,