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Date: Mon, 1 Feb 2016 15:51:54 +0100
From: Roman Pen <roman.penyaev@...fitbricks.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Roman Pen <roman.penyaev@...fitbricks.com>,
Gi-Oh Kim <gi-oh.kim@...fitbricks.com>,
Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: [PATCH 3/4] block,fs: switch to a new put_gendisk() call
In previous patch a new put_gendisk() call was introduced, which puts the
disk and the disk owner module references.
This new call should help not to forget about required module_put() after
receiving a disk pointer using get_disk() or get_gendisk() calls.
In this patch disk_put(),module_put() sequences are replaced with a single
put_gendisk() call.
Signed-off-by: Roman Pen <roman.penyaev@...fitbricks.com>
Cc: Gi-Oh Kim <gi-oh.kim@...fitbricks.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-block@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org
---
block/blk-cgroup.c | 15 +++------------
fs/block_dev.c | 24 +++++++-----------------
2 files changed, 10 insertions(+), 29 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 66e6f1a..2ed9636 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -788,7 +788,6 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
{
struct gendisk *disk;
struct blkcg_gq *blkg;
- struct module *owner;
unsigned int major, minor;
int key_len, part, ret;
char *body;
@@ -805,9 +804,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
if (!disk)
return -ENODEV;
if (part) {
- owner = disk->fops->owner;
- put_disk(disk);
- module_put(owner);
+ put_gendisk(disk);
return -ENODEV;
}
@@ -823,9 +820,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
ret = PTR_ERR(blkg);
rcu_read_unlock();
spin_unlock_irq(disk->queue->queue_lock);
- owner = disk->fops->owner;
- put_disk(disk);
- module_put(owner);
+ put_gendisk(disk);
/*
* If queue was bypassing, we should retry. Do so after a
* short msleep(). It isn't strictly necessary but queue
@@ -856,13 +851,9 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep);
void blkg_conf_finish(struct blkg_conf_ctx *ctx)
__releases(ctx->disk->queue->queue_lock) __releases(rcu)
{
- struct module *owner;
-
spin_unlock_irq(ctx->disk->queue->queue_lock);
rcu_read_unlock();
- owner = ctx->disk->fops->owner;
- put_disk(ctx->disk);
- module_put(owner);
+ put_gendisk(ctx->disk);
}
EXPORT_SYMBOL_GPL(blkg_conf_finish);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7b9cd49..dc2ea76 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -15,7 +15,6 @@
#include <linux/highmem.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
-#include <linux/module.h>
#include <linux/blkpg.h>
#include <linux/magic.h>
#include <linux/buffer_head.h>
@@ -870,8 +869,7 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
else
whole = bdgrab(bdev);
- module_put(disk->fops->owner);
- put_disk(disk);
+ put_gendisk(disk);
if (!whole)
return ERR_PTR(-ENOMEM);
@@ -1167,7 +1165,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
- struct module *owner;
int ret;
int partno;
int perm = 0;
@@ -1193,7 +1190,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk = get_gendisk(bdev->bd_dev, &partno);
if (!disk)
goto out;
- owner = disk->fops->owner;
disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
@@ -1222,8 +1218,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_queue = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
- put_disk(disk);
- module_put(owner);
+ put_gendisk(disk);
goto restart;
}
}
@@ -1285,9 +1280,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (ret)
goto out_unlock_bdev;
}
- /* only one opener holds refs to the module and disk */
- put_disk(disk);
- module_put(owner);
+ /* only one opener holds refs to the disk */
+ put_gendisk(disk);
}
bdev->bd_openers++;
if (for_part)
@@ -1307,8 +1301,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
- put_disk(disk);
- module_put(owner);
+ put_gendisk(disk);
out:
bdput(bdev);
@@ -1525,7 +1518,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
/*
* Detaching bdev inode from its wb in __destroy_inode()
* is too late: the queue which embeds its bdi (along with
- * root wb) can be gone as soon as we put_disk() below.
+ * root wb) can be gone as soon as we put_gendisk() below.
*/
inode_detach_wb(bdev->bd_inode);
}
@@ -1534,8 +1527,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
disk->fops->release(disk, mode);
}
if (!bdev->bd_openers) {
- struct module *owner = disk->fops->owner;
-
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
@@ -1543,8 +1534,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;
- put_disk(disk);
- module_put(owner);
+ put_gendisk(disk);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);
--
2.6.2
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