On Thu, Aug 20, 2015 at 12:07:49PM +0200, Pierre Morel wrote: > When triggering thaw-filesystems via magic sysrq, the system enters a > loop in do_thaw_one(), as thaw_bdev() still returns success if > bd_fsfreeze_count == 0. To fix this, let thaw_bdev() always return > error (and simplify the code a bit at the same time). > > Reviewed-by: Eric Farman <[email protected]> > Reviewed-by: Cornelia Huck <[email protected]> > Signed-off-by: Pierre Morel <[email protected]> > --- > fs/block_dev.c | 7 ++----- > 1 file changed, 2 insertions(+), 5 deletions(-) > > diff --git a/fs/block_dev.c b/fs/block_dev.c > index c7e4163..7809c92 100644 > --- a/fs/block_dev.c > +++ b/fs/block_dev.c > @@ -269,14 +269,11 @@ int thaw_bdev(struct block_device *bdev, struct > super_block *sb) > error = sb->s_op->thaw_super(sb); > else > error = thaw_super(sb); > - if (error) { > + if (error) > bdev->bd_fsfreeze_count++; > - mutex_unlock(&bdev->bd_fsfreeze_mutex); > - return error; > - } > out: > mutex_unlock(&bdev->bd_fsfreeze_mutex); > - return 0; > + return error; > } > EXPORT_SYMBOL(thaw_bdev); >
Apparently this never got in. The bug is still there, reproducible with mere: echo j > /proc/sysrq-trigger -- Mateusz Guzik
