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loop: Push loop_ctl_mutex down to loop_set_status() 

Push loop_ctl_mutex down to loop_set_status(). We will need this to be
able to call loop_reread_partitions() without loop_ctl_mutex.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2018-11-08 14:01:09 +01:00 committed by Jens Axboe
parent 4a5ce9ba58
commit 550df5fdac
1 changed files with 25 additions and 26 deletions
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51
drivers/block/loop.c
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@ -1141,46 +1141,55 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
struct loop_func_table *xfer;
kuid_t uid = current_uid();
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)
return err;
if (lo->lo_encrypt_key_size &&
!uid_eq(lo->lo_key_owner, uid) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
if (lo->lo_state != Lo_bound)
return -ENXIO;
if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE)
return -EINVAL;
!capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto out_unlock;
}
if (lo->lo_state != Lo_bound) {
err = -ENXIO;
goto out_unlock;
}
if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE) {
err = -EINVAL;
goto out_unlock;
}
/* I/O need to be drained during transfer transition */
blk_mq_freeze_queue(lo->lo_queue);
err = loop_release_xfer(lo);
if (err)
goto exit;
goto out_unfreeze;
if (info->lo_encrypt_type) {
unsigned int type = info->lo_encrypt_type;
if (type >= MAX_LO_CRYPT) {
err = -EINVAL;
goto exit;
goto out_unfreeze;
}
xfer = xfer_funcs[type];
if (xfer == NULL) {
err = -EINVAL;
goto exit;
goto out_unfreeze;
}
} else
xfer = NULL;
err = loop_init_xfer(lo, xfer, info);
if (err)
goto exit;
goto out_unfreeze;
if (lo->lo_offset != info->lo_offset ||
lo->lo_sizelimit != info->lo_sizelimit) {
if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit)) {
err = -EFBIG;
goto exit;
goto out_unfreeze;
}
}
@ -1212,7 +1221,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
/* update dio if lo_offset or transfer is changed */
__loop_update_dio(lo, lo->use_dio);
exit:
out_unfreeze:
blk_mq_unfreeze_queue(lo->lo_queue);
if (!err && (info->lo_flags & LO_FLAGS_PARTSCAN) &&
@ -1221,6 +1230,8 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
lo->lo_disk->flags &= ~GENHD_FL_NO_PART_SCAN;
loop_reread_partitions(lo, lo->lo_device);
}
out_unlock:
mutex_unlock(&loop_ctl_mutex);
return err;
}
@ -1467,12 +1478,8 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
case LOOP_SET_STATUS:
err = -EPERM;
if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)
return err;
err = loop_set_status_old(lo,
(struct loop_info __user *)arg);
mutex_unlock(&loop_ctl_mutex);
}
break;
case LOOP_GET_STATUS:
@ -1480,12 +1487,8 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
case LOOP_SET_STATUS64:
err = -EPERM;
if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)
return err;
err = loop_set_status64(lo,
(struct loop_info64 __user *) arg);
mutex_unlock(&loop_ctl_mutex);
}
break;
case LOOP_GET_STATUS64:
@ -1630,12 +1633,8 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
switch(cmd) {
case LOOP_SET_STATUS:
err = mutex_lock_killable(&loop_ctl_mutex);
if (!err) {
err = loop_set_status_compat(lo,
(const struct compat_loop_info __user *)arg);
mutex_unlock(&loop_ctl_mutex);
}
err = loop_set_status_compat(lo,
(const struct compat_loop_info __user *)arg);
break;
case LOOP_GET_STATUS:
err = loop_get_status_compat(lo,