• Jan Kara's avatar
    quota: Make quota code not call tty layer with dqptr_sem held · bf097aaf
    Jan Kara authored
    dqptr_sem can be called from slab reclaim. tty layer uses GFP_KERNEL mask for
    allocation so it can end up calling slab reclaim. Given quota code can call
    into tty layer to print warning this creates possibility for lock inversion
    between tty->atomic_write_lock and dqptr_sem.
    
    Using direct printing of warnings from quota layer is obsolete but since it's
    easy enough to change quota code to not hold any locks when printing warnings,
    let's just do it. It seems like a good thing to do even when we use netlink
    layer to transmit warnings to userspace.
    Reported-by: default avatarMarkus <M4rkusXXL@web.de>
    Signed-off-by: default avatarJan Kara <jack@suse.cz>
    bf097aaf
dquot.c 72.7 KB