From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
linux-block@vger.kernel.org
Subject: [PATCH 8/9] loop: split loop_lookup
Date: Mon, 21 Jun 2021 12:15:46 +0200 [thread overview]
Message-ID: <20210621101547.3764003-9-hch@lst.de> (raw)
In-Reply-To: <20210621101547.3764003-1-hch@lst.de>
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>
---
drivers/block/loop.c | 57 ++++++++++----------------------------------
1 file changed, 12 insertions(+), 45 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 54e2551e339c..2ff5162bd28b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2184,44 +2184,6 @@ 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;
@@ -2245,9 +2207,11 @@ 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)
@@ -2271,17 +2235,20 @@ static int loop_control_remove(int idx)
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 lo->lo_number;
}
static long loop_control_ioctl(struct file *file, unsigned int cmd,
--
2.30.2
next prev parent reply other threads:[~2021-06-21 10:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-21 10:15 loop cleanups Christoph Hellwig
2021-06-21 10:15 ` [PATCH 1/9] loop: reorder loop_exit Christoph Hellwig
2021-06-21 20:04 ` Chaitanya Kulkarni
2021-06-21 10:15 ` [PATCH 2/9] loop: reduce loop_ctl_mutex coverage in loop_exit Christoph Hellwig
2021-06-21 20:07 ` Chaitanya Kulkarni
2021-06-21 10:15 ` [PATCH 3/9] loop: remove the l argument to loop_add Christoph Hellwig
2021-06-21 20:09 ` Chaitanya Kulkarni
2021-06-21 10:15 ` [PATCH 4/9] loop: don't call loop_lookup before adding a loop device Christoph Hellwig
2021-06-21 10:15 ` [PATCH 5/9] loop: split loop_control_ioctl Christoph Hellwig
2021-06-21 20:14 ` Chaitanya Kulkarni
2021-06-21 10:15 ` [PATCH 6/9] loop: move loop_ctl_mutex locking into loop_add Christoph Hellwig
2021-06-21 20:16 ` Chaitanya Kulkarni
2021-06-21 10:15 ` [PATCH 7/9] loop: don't allow deleting an unspecified loop device Christoph Hellwig
2021-06-21 10:15 ` Christoph Hellwig [this message]
2021-06-21 10:15 ` [PATCH 9/9] loop: rewrite loop_exit using idr_for_each_entry Christoph Hellwig
2021-06-21 20:20 ` Chaitanya Kulkarni
2021-06-22 11:15 ` loop cleanups Tetsuo Handa
2021-06-23 14:41 ` Christoph Hellwig
2021-06-23 14:58 loop cleanups v2 Christoph Hellwig
2021-06-23 14:59 ` [PATCH 8/9] loop: split loop_lookup Christoph Hellwig
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