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Message-Id: <20190430113531.495120419@linuxfoundation.org>
Date: Tue, 30 Apr 2019 13:38:40 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Salvatore Bonaccorso <carnil@...ian.org>,
Jan Kara <jack@...e.cz>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.9 29/41] Revert "block/loop: Use global lock for ioctl() operation."
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
This reverts commit 3ae3d167f5ec2c7bb5fcd12b7772cfadc93b2305 which is
commit 310ca162d779efee8a2dc3731439680f3e9c1e86 upstream.
Jan Kara has reported seeing problems with this patch applied, as has
Salvatore Bonaccorso, so let's drop it for now.
Reported-by: Salvatore Bonaccorso <carnil@...ian.org>
Reported-by: Jan Kara <jack@...e.cz>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/block/loop.c | 42 +++++++++++++++++++++---------------------
drivers/block/loop.h | 1 +
2 files changed, 22 insertions(+), 21 deletions(-)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -82,7 +82,6 @@
static DEFINE_IDR(loop_index_idr);
static DEFINE_MUTEX(loop_index_mutex);
-static DEFINE_MUTEX(loop_ctl_mutex);
static int max_part;
static int part_shift;
@@ -1034,7 +1033,7 @@ static int loop_clr_fd(struct loop_devic
*/
if (atomic_read(&lo->lo_refcnt) > 1) {
lo->lo_flags |= LO_FLAGS_AUTOCLEAR;
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
return 0;
}
@@ -1083,12 +1082,12 @@ static int loop_clr_fd(struct loop_devic
if (!part_shift)
lo->lo_disk->flags |= GENHD_FL_NO_PART_SCAN;
loop_unprepare_queue(lo);
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
/*
- * Need not hold loop_ctl_mutex to fput backing file.
- * Calling fput holding loop_ctl_mutex triggers a circular
+ * Need not hold lo_ctl_mutex to fput backing file.
+ * Calling fput holding lo_ctl_mutex triggers a circular
* lock dependency possibility warning as fput can take
- * bd_mutex which is usually taken before loop_ctl_mutex.
+ * bd_mutex which is usually taken before lo_ctl_mutex.
*/
fput(filp);
return 0;
@@ -1351,7 +1350,7 @@ static int lo_ioctl(struct block_device
struct loop_device *lo = bdev->bd_disk->private_data;
int err;
- mutex_lock_nested(&loop_ctl_mutex, 1);
+ mutex_lock_nested(&lo->lo_ctl_mutex, 1);
switch (cmd) {
case LOOP_SET_FD:
err = loop_set_fd(lo, mode, bdev, arg);
@@ -1360,7 +1359,7 @@ static int lo_ioctl(struct block_device
err = loop_change_fd(lo, bdev, arg);
break;
case LOOP_CLR_FD:
- /* loop_clr_fd would have unlocked loop_ctl_mutex on success */
+ /* loop_clr_fd would have unlocked lo_ctl_mutex on success */
err = loop_clr_fd(lo);
if (!err)
goto out_unlocked;
@@ -1396,7 +1395,7 @@ static int lo_ioctl(struct block_device
default:
err = lo->ioctl ? lo->ioctl(lo, cmd, arg) : -EINVAL;
}
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
out_unlocked:
return err;
@@ -1529,16 +1528,16 @@ static int lo_compat_ioctl(struct block_
switch(cmd) {
case LOOP_SET_STATUS:
- mutex_lock(&loop_ctl_mutex);
+ mutex_lock(&lo->lo_ctl_mutex);
err = loop_set_status_compat(
lo, (const struct compat_loop_info __user *) arg);
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
break;
case LOOP_GET_STATUS:
- mutex_lock(&loop_ctl_mutex);
+ mutex_lock(&lo->lo_ctl_mutex);
err = loop_get_status_compat(
lo, (struct compat_loop_info __user *) arg);
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
break;
case LOOP_SET_CAPACITY:
case LOOP_CLR_FD:
@@ -1582,7 +1581,7 @@ static void __lo_release(struct loop_dev
if (atomic_dec_return(&lo->lo_refcnt))
return;
- mutex_lock(&loop_ctl_mutex);
+ mutex_lock(&lo->lo_ctl_mutex);
if (lo->lo_flags & LO_FLAGS_AUTOCLEAR) {
/*
* In autoclear mode, stop the loop thread
@@ -1599,7 +1598,7 @@ static void __lo_release(struct loop_dev
loop_flush(lo);
}
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
}
static void lo_release(struct gendisk *disk, fmode_t mode)
@@ -1645,10 +1644,10 @@ static int unregister_transfer_cb(int id
struct loop_device *lo = ptr;
struct loop_func_table *xfer = data;
- mutex_lock(&loop_ctl_mutex);
+ mutex_lock(&lo->lo_ctl_mutex);
if (lo->lo_encryption == xfer)
loop_release_xfer(lo);
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
return 0;
}
@@ -1814,6 +1813,7 @@ static int loop_add(struct loop_device *
if (!part_shift)
disk->flags |= GENHD_FL_NO_PART_SCAN;
disk->flags |= GENHD_FL_EXT_DEVT;
+ mutex_init(&lo->lo_ctl_mutex);
atomic_set(&lo->lo_refcnt, 0);
lo->lo_number = i;
spin_lock_init(&lo->lo_lock);
@@ -1926,19 +1926,19 @@ static long loop_control_ioctl(struct fi
ret = loop_lookup(&lo, parm);
if (ret < 0)
break;
- mutex_lock(&loop_ctl_mutex);
+ mutex_lock(&lo->lo_ctl_mutex);
if (lo->lo_state != Lo_unbound) {
ret = -EBUSY;
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
break;
}
if (atomic_read(&lo->lo_refcnt) > 0) {
ret = -EBUSY;
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
break;
}
lo->lo_disk->private_data = NULL;
- mutex_unlock(&loop_ctl_mutex);
+ mutex_unlock(&lo->lo_ctl_mutex);
idr_remove(&loop_index_idr, lo->lo_number);
loop_remove(lo);
break;
--- a/drivers/block/loop.h
+++ b/drivers/block/loop.h
@@ -55,6 +55,7 @@ struct loop_device {
spinlock_t lo_lock;
int lo_state;
+ struct mutex lo_ctl_mutex;
struct kthread_worker worker;
struct task_struct *worker_task;
bool use_dio;
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