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block: convert to idr_alloc()

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Convert to the much saner new idr interface.  Both bsg and genhd
protect idr w/ mutex making preloading unnecessary.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Tejun Heo 2013-02-27 17:03:57 -08:00 • committed by Linus Torvalds
commit bab998d62f
2 changed files with 15 additions and 32 deletions
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21
block/genhd.c
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@ -411,7 +411,7 @@ static int blk_mangle_minor(int minor)
int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
{
struct gendisk *disk = part_to_disk(part);
int idx, rc;
int idx;
/* in consecutive minor range? */
if (part->partno < disk->minors) {
@ -420,20 +420,11 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
}
/* allocate ext devt */
do {
if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL))
return -ENOMEM;
mutex_lock(&ext_devt_mutex);
rc = idr_get_new(&ext_devt_idr, part, &idx);
if (!rc && idx >= NR_EXT_DEVT) {
idr_remove(&ext_devt_idr, idx);
rc = -EBUSY;
}
mutex_unlock(&ext_devt_mutex);
} while (rc == -EAGAIN);
if (rc)
return rc;
mutex_lock(&ext_devt_mutex);
idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_KERNEL);
mutex_unlock(&ext_devt_mutex);
if (idx < 0)
return idx == -ENOSPC ? -EBUSY : idx;
*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));
return 0;