diff options
Diffstat (limited to 'include/linux/blkdev_compat.h')
| -rw-r--r-- | include/linux/blkdev_compat.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h index 9d3e6f07c..47f569bbd 100644 --- a/include/linux/blkdev_compat.h +++ b/include/linux/blkdev_compat.h @@ -478,4 +478,13 @@ blk_queue_discard_granularity(struct request_queue *q, unsigned int dg) */ #define VDEV_SCHEDULER "noop" +/* + * A common holder for vdev_bdev_open() is used to relax the exclusive open + * semantics slightly. Internal vdev disk callers may pass VDEV_HOLDER to + * allow them to open the device multiple times. Other kernel callers and + * user space processes which don't pass this value will get EBUSY. This is + * currently required for the correct operation of hot spares. + */ +#define VDEV_HOLDER ((void *)0x2f5401de7) + #endif /* _ZFS_BLKDEV_H */ |