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s390/dasd: retry partition detection 

In case somebody attempted to open the device during online
processing the partition detection ioctl may have failed.

Added a retry loop to avoid not detected partitions.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2014-11-24 15:04:09 +01:00 committed by Martin Schwidefsky
parent 932f0549f8
commit 6ebdf1c79d
1 changed files with 24 additions and 2 deletions
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26
drivers/s390/block/dasd_genhd.c
View File

@ -99,15 +99,37 @@ void dasd_gendisk_free(struct dasd_block *block)
int dasd_scan_partitions(struct dasd_block *block)
{
struct block_device *bdev;
int retry, rc;
retry = 5;
bdev = bdget_disk(block->gdp, 0);
if (!bdev || blkdev_get(bdev, FMODE_READ, NULL) < 0)
if (!bdev) {
DBF_DEV_EVENT(DBF_ERR, block->base, "%s",
"scan partitions error, bdget returned NULL");
return -ENODEV;
}
rc = blkdev_get(bdev, FMODE_READ, NULL);
if (rc < 0) {
DBF_DEV_EVENT(DBF_ERR, block->base,
"scan partitions error, blkdev_get returned %d",
rc);
return -ENODEV;
}
/*
* See fs/partition/check.c:register_disk,rescan_partitions
* Can't call rescan_partitions directly. Use ioctl.
*/
ioctl_by_bdev(bdev, BLKRRPART, 0);
rc = ioctl_by_bdev(bdev, BLKRRPART, 0);
while (rc == -EBUSY && retry > 0) {
schedule();
rc = ioctl_by_bdev(bdev, BLKRRPART, 0);
retry--;
DBF_DEV_EVENT(DBF_ERR, block->base,
"scan partitions error, retry %d rc %d",
retry, rc);
}
/*
* Since the matching blkdev_put call to the blkdev_get in
* this function is not called before dasd_destroy_partitions