Patchwork [v3,7/7] block: genhd: add an interface to set disk's poll interval

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Submitter Aaron Lu
Date July 26, 2012, 10:05 a.m.
Message ID <1343297129-28174-8-git-send-email-aaron.lu@amd.com>
Download mbox | patch
Permalink /patch/173390/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Aaron Lu - July 26, 2012, 10:05 a.m.
Set the ODD's in kernel poll interval to 2s for the user in case the
user is using an old distro on which udev will not set the system wide
block parameter events_dfl_poll_msecs.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
---
 block/genhd.c         | 23 +++++++++++++++++------
 drivers/scsi/sr.c     |  1 +
 include/linux/genhd.h |  1 +
 3 files changed, 19 insertions(+), 6 deletions(-)

Patch

diff --git a/block/genhd.c b/block/genhd.c
index bdb3682..de9b9d9 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1619,6 +1619,19 @@  static void disk_events_workfn(struct work_struct *work)
 		kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);
 }
 
+int disk_events_set_poll_msecs(struct gendisk *disk, long intv)
+{
+	if (intv < 0 && intv != -1)
+		return -EINVAL;
+
+	disk_block_events(disk);
+	disk->ev->poll_msecs = intv;
+	__disk_unblock_events(disk, true);
+
+	return 0;
+}
+EXPORT_SYMBOL(disk_events_set_poll_msecs);
+
 /*
  * A disk events enabled device has the following sysfs nodes under
  * its /sys/block/X/ directory.
@@ -1675,16 +1688,14 @@  static ssize_t disk_events_poll_msecs_store(struct device *dev,
 {
 	struct gendisk *disk = dev_to_disk(dev);
 	long intv;
+	int ret;
 
 	if (!count || !sscanf(buf, "%ld", &intv))
 		return -EINVAL;
 
-	if (intv < 0 && intv != -1)
-		return -EINVAL;
-
-	disk_block_events(disk);
-	disk->ev->poll_msecs = intv;
-	__disk_unblock_events(disk, true);
+	ret = disk_events_set_poll_msecs(disk, intv);
+	if (ret)
+		return ret;
 
 	return count;
 }
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index b8c2f9d..d639bcc 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -862,6 +862,7 @@  static int sr_probe(struct device *dev)
 	dev_set_drvdata(dev, cd);
 	disk->flags |= GENHD_FL_REMOVABLE;
 	add_disk(disk);
+	disk_events_set_poll_msecs(disk, 2000);
 
 	sdev_printk(KERN_DEBUG, sdev,
 		    "Attached scsi CD-ROM %s\n", cd->cdi.name);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 017a7fb..7414fb5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -418,6 +418,7 @@  extern void disk_block_events(struct gendisk *disk);
 extern void disk_unblock_events(struct gendisk *disk);
 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
+extern int disk_events_set_poll_msecs(struct gendisk *disk, long intv);
 
 /* drivers/char/random.c */
 extern void add_disk_randomness(struct gendisk *disk);