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authorChristoph Hellwig <hch@lst.de>2021-06-23 16:59:07 +0200
committerJens Axboe <axboe@kernel.dk>2021-06-30 15:34:13 -0600
commitb9848081465d8734441408129bd44311c7b6d644 (patch)
treebdf8030536649a8bdee53542d5932352091d8c23 /drivers/block
parente5d66a10324f2a0c31153fd6210d99a9d00ef047 (diff)
loop: split loop_lookup
loop_lookup has two callers - one wants to do the a find by index and the other wants any unbound loop device. Open code the respective functionality in each caller. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210623145908.92973-9-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/loop.c57
1 files changed, 12 insertions, 45 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index b217065a6d67..ff7014608ef6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2353,44 +2353,6 @@ static void loop_remove(struct loop_device *lo)
kfree(lo);
}
-static int find_free_cb(int id, void *ptr, void *data)
-{
- struct loop_device *lo = ptr;
- struct loop_device **l = data;
-
- if (lo->lo_state == Lo_unbound) {
- *l = lo;
- return 1;
- }
- return 0;
-}
-
-static int loop_lookup(struct loop_device **l, int i)
-{
- struct loop_device *lo;
- int ret = -ENODEV;
-
- if (i < 0) {
- int err;
-
- err = idr_for_each(&loop_index_idr, &find_free_cb, &lo);
- if (err == 1) {
- *l = lo;
- ret = lo->lo_number;
- }
- goto out;
- }
-
- /* lookup and return a specific i */
- lo = idr_find(&loop_index_idr, i);
- if (lo) {
- *l = lo;
- ret = lo->lo_number;
- }
-out:
- return ret;
-}
-
static void loop_probe(dev_t dev)
{
int idx = MINOR(dev) >> part_shift;
@@ -2414,9 +2376,11 @@ static int loop_control_remove(int idx)
if (ret)
return ret;
- ret = loop_lookup(&lo, idx);
- if (ret < 0)
+ lo = idr_find(&loop_index_idr, idx);
+ if (!lo) {
+ ret = -ENODEV;
goto out_unlock_ctrl;
+ }
ret = mutex_lock_killable(&lo->lo_mutex);
if (ret)
@@ -2440,17 +2404,20 @@ out_unlock_ctrl:
static int loop_control_get_free(int idx)
{
struct loop_device *lo;
- int ret;
+ int id, ret;
ret = mutex_lock_killable(&loop_ctl_mutex);
if (ret)
return ret;
- ret = loop_lookup(&lo, -1);
+ idr_for_each_entry(&loop_index_idr, lo, id) {
+ if (lo->lo_state == Lo_unbound)
+ goto found;
+ }
mutex_unlock(&loop_ctl_mutex);
-
- if (ret >= 0)
- return ret;
return loop_add(-1);
+found:
+ mutex_unlock(&loop_ctl_mutex);
+ return id;
}
static long loop_control_ioctl(struct file *file, unsigned int cmd,