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authorTejun Heo <tj@kernel.org>2008-08-29 09:01:47 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 08:56:07 +0200
commit548b10eb2959c96cef6fc29fc96e0931eeb53bc5 (patch)
tree7166bc04336b80a69f87a9add097919b418f4f43 /block/genhd.c
parent80795aefb76d10c5d698e60c7e7750b5330787da (diff)
downloadop-kernel-dev-548b10eb2959c96cef6fc29fc96e0931eeb53bc5.zip
op-kernel-dev-548b10eb2959c96cef6fc29fc96e0931eeb53bc5.tar.gz
block: move __dev from disk to part0
Move disk->__dev to part0->__dev. This simplifies bdget_disk() and lookup_devt() and allows common sysfs attributes to be unified. part_to_disk() is updated to handle part0 -> disk. Updated to include a fix from Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>, he writes: "part0 is a "special" partition and doesn't need to have capacity set - this fixes regression caused by "block: move __dev from disk to part0" commit." Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c40
1 files changed, 12 insertions, 28 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 65b7386..36b9f1b 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -537,22 +537,15 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
*/
extern struct block_device *bdget_disk(struct gendisk *disk, int partno)
{
- dev_t devt = MKDEV(0, 0);
+ struct hd_struct *part;
+ struct block_device *bdev = NULL;
- if (partno == 0)
- devt = disk_devt(disk);
- else {
- struct hd_struct *part;
+ part = disk_get_part(disk, partno);
+ if (part && (part->nr_sects || partno == 0))
+ bdev = bdget(part_devt(part));
+ disk_put_part(part);
- part = disk_get_part(disk, partno);
- if (part && part->nr_sects)
- devt = part_devt(part);
- disk_put_part(part);
- }
-
- if (likely(devt != MKDEV(0, 0)))
- return bdget(devt);
- return NULL;
+ return bdev;
}
EXPORT_SYMBOL(bdget_disk);
@@ -1000,27 +993,18 @@ dev_t blk_lookup_devt(const char *name, int partno)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
+ struct hd_struct *part;
if (strcmp(dev->bus_id, name))
continue;
- if (partno < 0 || partno >= disk_max_parts(disk))
- continue;
-
- if (partno == 0)
- devt = disk_devt(disk);
- else {
- struct hd_struct *part;
-
- part = disk_get_part(disk, partno);
- if (!part || !part->nr_sects) {
- disk_put_part(part);
- continue;
- }
+ part = disk_get_part(disk, partno);
+ if (part && (part->nr_sects || partno == 0)) {
devt = part_devt(part);
disk_put_part(part);
+ break;
}
- break;
+ disk_put_part(part);
}
class_dev_iter_exit(&iter);
return devt;
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