On 10/26/2012 03:51 PM, Matt Fleming wrote:
> +static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
> +{
> + struct efivar_entry *var = dentry->d_inode->i_private;
> + struct efivars *efivars = var->efivars;
> + efi_status_t status;
> +
> + spin_lock(&efivars->lock);
> +
> + status = efivars->ops->set_variable(var->var.VariableName,
> + &var->var.VendorGuid,
> + 0, 0, NULL);
> +
> + if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) {
> + list_del(&var->list);
> + spin_unlock(&efivars->lock);
> + efivar_unregister(var);
> + drop_nlink(dir);
This should be drop_nlink(dentry->d_inode);
I'm getting warnings when testing Fedora 18 kernel with efivarfs patch
backported. i_nlink underflowed.
[root@localhost ~]# mount -t efivarfs - /sys/firmware/efi/efivars/
[root@localhost ~]# ls -1 /sys/firmware/efi/efivars/ | wc -l
28
[root@localhost ~]# stat -c%h /sys/firmware/efi/efivars/
2
[root@localhost ~]# rm -f /sys/firmware/efi/efivars/*
[ 41.690805] ------------[ cut here ]------------
[ 41.692975] WARNING: at fs/inode.c:280 drop_nlink+0x46/0x50()
[ 41.694546] Modules linked in: nf_conntrack_netbios_ns
nf_conntrack_broadcast ipt_MASQUERADE ip6table_mangle ip6t_REJECT
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables iptable_nat nf_nat
iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack vfat
fat i2c_piix4 i2c_core microcode virtio_net
[ 41.701583] Pid: 822, comm: rm Tainted: G W
3.6.11-3.fc18.x86_64.debug #1
[ 41.703008] Call Trace:
[ 41.703499] [<ffffffff8106781f>] warn_slowpath_common+0x7f/0xc0
[ 41.704591] [<ffffffff8106787a>] warn_slowpath_null+0x1a/0x20
[ 41.705777] [<ffffffff811eb266>] drop_nlink+0x46/0x50
[ 41.706855] [<ffffffff81553fca>] efivarfs_unlink+0x8a/0xd0
[ 41.707952] [<ffffffff811dd75e>] vfs_unlink+0x9e/0x110
[ 41.710800] [<ffffffff811dd90d>] do_unlinkat+0x13d/0x1a0
[ 41.712096] [<ffffffff810d6b6d>] ? trace_hardirqs_on_caller+0x10d/0x1a0
[ 41.713808] [<ffffffff8110181c>] ? __audit_syscall_entry+0xcc/0x300
[ 41.714983] [<ffffffff8134f50e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 41.716548] [<ffffffff811e025b>] sys_unlinkat+0x1b/0x50
[ 41.717694] [<ffffffff816e7fe9>] system_call_fastpath+0x16/0x1b
[ 41.718995] ---[ end trace 33f799b901d1db9e ]---
[root@localhost ~]# ls -1 /sys/firmware/efi/efivars/ | wc -l
15
[root@localhost ~]# stat -c%h /sys/firmware/efi/efivars/
4294967285
> + dput(dentry);
> + return 0;
> + }
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