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loop: Push loop_ctl_mutex down to loop_set_fd() 

Push lo_ctl_mutex down to loop_set_fd(). We will need this to be able to
call loop_reread_partitions() without lo_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 14:01:10 +01:00 committed by Jens Axboe
parent 550df5fdac
commit 757ecf40b7
1 changed files with 14 additions and 12 deletions
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26
drivers/block/loop.c
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@ -918,13 +918,17 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
if (!file)
goto out;
error = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (error)
goto out_putf;
error = -EBUSY;
if (lo->lo_state != Lo_unbound)
goto out_putf;
goto out_unlock;
error = loop_validate_file(file, bdev);
if (error)
goto out_putf;
goto out_unlock;
mapping = file->f_mapping;
inode = mapping->host;
@ -936,10 +940,10 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
error = -EFBIG;
size = get_loop_size(lo, file);
if ((loff_t)(sector_t)size != size)
goto out_putf;
goto out_unlock;
error = loop_prepare_queue(lo);
if (error)
goto out_putf;
goto out_unlock;
error = 0;
@ -978,11 +982,14 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
* put /dev/loopXX inode. Later in __loop_clr_fd() we bdput(bdev).
*/
bdgrab(bdev);
mutex_unlock(&loop_ctl_mutex);
return 0;
out_putf:
out_unlock:
mutex_unlock(&loop_ctl_mutex);
out_putf:
fput(file);
out:
out:
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
return error;
@ -1460,12 +1467,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
switch (cmd) {
case LOOP_SET_FD:
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)
return err;
err = loop_set_fd(lo, mode, bdev, arg);
mutex_unlock(&loop_ctl_mutex);
break;
return loop_set_fd(lo, mode, bdev, arg);
case LOOP_CHANGE_FD:
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)