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Subject[PATCH 4.19 87/99] loop: Push loop_ctl_mutex down to loop_get_status()
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@suse.cz>

commit 4a5ce9ba5877e4640200d84a735361306ad1a1b8 upstream.

Push loop_ctl_mutex down to loop_get_status() to avoid the unusual
convention that the function gets called with loop_ctl_mutex held and
releases it.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/block/loop.c | 37 ++++++++++---------------------------
1 file changed, 10 insertions(+), 27 deletions(-)

--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1233,6 +1233,9 @@ loop_get_status(struct loop_device *lo,
struct kstat stat;
int ret;

+ ret = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
+ if (ret)
+ return ret;
if (lo->lo_state != Lo_bound) {
mutex_unlock(&loop_ctl_mutex);
return -ENXIO;
@@ -1347,10 +1350,8 @@ loop_get_status_old(struct loop_device *
struct loop_info64 info64;
int err;

- if (!arg) {
- mutex_unlock(&loop_ctl_mutex);
+ if (!arg)
return -EINVAL;
- }
err = loop_get_status(lo, &info64);
if (!err)
err = loop_info64_to_old(&info64, &info);
@@ -1365,10 +1366,8 @@ loop_get_status64(struct loop_device *lo
struct loop_info64 info64;
int err;

- if (!arg) {
- mutex_unlock(&loop_ctl_mutex);
+ if (!arg)
return -EINVAL;
- }
err = loop_get_status(lo, &info64);
if (!err && copy_to_user(arg, &info64, sizeof(info64)))
err = -EFAULT;
@@ -1478,12 +1477,7 @@ static int lo_ioctl(struct block_device
}
break;
case LOOP_GET_STATUS:
- err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
- if (err)
- return err;
- err = loop_get_status_old(lo, (struct loop_info __user *) arg);
- /* loop_get_status() unlocks loop_ctl_mutex */
- break;
+ return loop_get_status_old(lo, (struct loop_info __user *) arg);
case LOOP_SET_STATUS64:
err = -EPERM;
if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
@@ -1496,12 +1490,7 @@ static int lo_ioctl(struct block_device
}
break;
case LOOP_GET_STATUS64:
- err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
- if (err)
- return err;
- err = loop_get_status64(lo, (struct loop_info64 __user *) arg);
- /* loop_get_status() unlocks loop_ctl_mutex */
- break;
+ return loop_get_status64(lo, (struct loop_info64 __user *) arg);
case LOOP_SET_CAPACITY:
case LOOP_SET_DIRECT_IO:
case LOOP_SET_BLOCK_SIZE:
@@ -1626,10 +1615,8 @@ loop_get_status_compat(struct loop_devic
struct loop_info64 info64;
int err;

- if (!arg) {
- mutex_unlock(&loop_ctl_mutex);
+ if (!arg)
return -EINVAL;
- }
err = loop_get_status(lo, &info64);
if (!err)
err = loop_info64_to_compat(&info64, arg);
@@ -1652,12 +1639,8 @@ static int lo_compat_ioctl(struct block_
}
break;
case LOOP_GET_STATUS:
- err = mutex_lock_killable(&loop_ctl_mutex);
- if (!err) {
- err = loop_get_status_compat(lo,
- (struct compat_loop_info __user *)arg);
- /* loop_get_status() unlocks loop_ctl_mutex */
- }
+ err = loop_get_status_compat(lo,
+ (struct compat_loop_info __user *)arg);
break;
case LOOP_SET_CAPACITY:
case LOOP_CLR_FD:

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