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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2009-05-22 17:17:52 -0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-05-22 23:22:55 +0200 |
| commit | cd43e26f071524647e660706b784ebcbefbd2e44 (patch) | |
| tree | 11625a25ba8a7c5cd4fe41b54d53506a7982433b /block/blk-sysfs.c | |
| parent | 025146e13b63483add912706c101fb0fb6f015cc (diff) | |
| download | lwn-cd43e26f071524647e660706b784ebcbefbd2e44.tar.gz lwn-cd43e26f071524647e660706b784ebcbefbd2e44.zip | |
block: Expose stacked device queues in sysfs
Currently stacking devices do not have a queue directory in sysfs.
However, many of the I/O characteristics like sector size, maximum
request size, etc. are queue properties.
This patch enables the queue directory for MD/DM devices. The elevator
code has been modified to deal with queues that do not have an I/O
scheduler.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 142a4acddd43..3ccdadb8e204 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -395,9 +395,6 @@ int blk_register_queue(struct gendisk *disk) if (WARN_ON(!q)) return -ENXIO; - if (!q->request_fn) - return 0; - ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj), "%s", "queue"); if (ret < 0) @@ -405,6 +402,9 @@ int blk_register_queue(struct gendisk *disk) kobject_uevent(&q->kobj, KOBJ_ADD); + if (!q->request_fn) + return 0; + ret = elv_register_queue(q); if (ret) { kobject_uevent(&q->kobj, KOBJ_REMOVE); |