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Subject[PATCH 22/77] block: convert to idr_alloc()
Date
Convert to the much saner new idr interface.  Both bsg and genhd
protect idr w/ mutex making preloading unnecessary.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
---
block/bsg.c | 26 +++++++++-----------------
block/genhd.c | 21 ++++++---------------
2 files changed, 15 insertions(+), 32 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index ff64ae3..3ca92eb 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -997,7 +997,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
{
struct bsg_class_device *bcd;
dev_t dev;
- int ret, minor;
+ int ret;
struct device *class_dev = NULL;
const char *devname;

@@ -1017,23 +1017,16 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,

mutex_lock(&bsg_mutex);

- ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL);
- if (!ret) {
- ret = -ENOMEM;
- goto unlock;
- }
-
- ret = idr_get_new(&bsg_minor_idr, bcd, &minor);
- if (ret < 0)
+ ret = idr_alloc(&bsg_minor_idr, bcd, 0, BSG_MAX_DEVS, GFP_KERNEL);
+ if (ret < 0) {
+ if (ret == -ENOSPC) {
+ printk(KERN_ERR "bsg: too many bsg devices\n");
+ ret = -EINVAL;
+ }
goto unlock;
-
- if (minor >= BSG_MAX_DEVS) {
- printk(KERN_ERR "bsg: too many bsg devices\n");
- ret = -EINVAL;
- goto remove_idr;
}

- bcd->minor = minor;
+ bcd->minor = ret;
bcd->queue = q;
bcd->parent = get_device(parent);
bcd->release = release;
@@ -1059,8 +1052,7 @@ unregister_class_dev:
device_unregister(class_dev);
put_dev:
put_device(parent);
-remove_idr:
- idr_remove(&bsg_minor_idr, minor);
+ idr_remove(&bsg_minor_idr, bcd->minor);
unlock:
mutex_unlock(&bsg_mutex);
return ret;
diff --git a/block/genhd.c b/block/genhd.c
index b1f34d0..bd509e3 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -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;
--
1.8.1


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