static int autofs_root_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
void __user *argp = (void __user *)arg;
DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current)));
if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
_IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
return -ENOTTY;
if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
return -EPERM;
switch(cmd) {
case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
return autofs_wait_release(sbi,(autofs_wqt_t)arg,0);
case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
autofs_catatonic_mode(sbi);
return 0;
case AUTOFS_IOC_PROTOVER: /* Get protocol version */
return autofs_get_protover(argp);
case AUTOFS_IOC_SETTIMEOUT:
return autofs_get_set_timeout(sbi, argp);
case AUTOFS_IOC_EXPIRE:
return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt,
argp);
default:
return -ENOSYS;
}
}
void autofs_kill_sb(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs_sbi(sb);
unsigned int n;
/*
* In the event of a failure in get_sb_nodev the superblock
* info is not present so nothing else has been setup, so
* just call kill_anon_super when we are called from
* deactivate_super.
*/
if (!sbi)
goto out_kill_sb;
if (!sbi->catatonic)
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
put_pid(sbi->oz_pgrp);
autofs_hash_nuke(sbi);
for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) {
if (test_bit(n, sbi->symlink_bitmap))
kfree(sbi->symlink[n].data);
}
kfree(sb->s_fs_info);
out_kill_sb:
DPRINTK(("autofs: shutting down\n"));
kill_anon_super(sb);
}
/*
* Make the autofs mount point catatonic, no longer responsive to
* mount requests. Also closes the kernel pipe file descriptor.
*/
static int autofs_dev_ioctl_catatonic(struct file *fp,
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
autofs_catatonic_mode(sbi);
return 0;
}
static void autofs_put_super(struct super_block *sb)
{
struct autofs_sb_info *sbi =
(struct autofs_sb_info *) sb->u.generic_sbp;
unsigned int n;
if ( !sbi->catatonic )
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
lock_super(sb);
autofs_hash_nuke(&sbi->dirhash);
for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
if ( test_bit(n, sbi->symlink_bitmap) )
kfree(sbi->symlink[n].data);
}
sb->s_dev = 0;
kfree(sb->u.generic_sbp);
unlock_super(sb);
DPRINTK(("autofs: shutting down\n"));
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
}
static void autofs_put_super(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs_sbi(sb);
unsigned int n;
if ( !sbi->catatonic )
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
autofs_hash_nuke(&sbi->dirhash);
for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
if ( test_bit(n, sbi->symlink_bitmap) )
kfree(sbi->symlink[n].data);
}
kfree(sb->s_fs_info);
DPRINTK(("autofs: shutting down\n"));
}
static void autofs_notify_daemon(struct autofs_sb_info *sbi, struct autofs_wait_queue *wq)
{
struct autofs_packet_missing pkt;
DPRINTK(("autofs_wait: wait id = 0x%08lx, name = ", wq->wait_queue_token));
autofs_say(wq->name,wq->len);
memset(&pkt,0,sizeof pkt); /* For security reasons */
pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
pkt.hdr.type = autofs_ptype_missing;
pkt.wait_queue_token = wq->wait_queue_token;
pkt.len = wq->len;
memcpy(pkt.name, wq->name, pkt.len);
pkt.name[pkt.len] = '\0';
if ( autofs_write(sbi->pipe,&pkt,sizeof(struct autofs_packet_missing)) )
autofs_catatonic_mode(sbi);
}
void autofs_kill_sb(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs_sbi(sb);
/*
* In the event of a failure in get_sb_nodev the superblock
* info is not present so nothing else has been setup, so
* just call kill_anon_super when we are called from
* deactivate_super.
*/
if (sbi) {
/* Free wait queues, close pipe */
autofs_catatonic_mode(sbi);
put_pid(sbi->oz_pgrp);
}
pr_debug("shutting down\n");
kill_litter_super(sb);
if (sbi)
kfree_rcu(sbi, rcu);
}