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freebsd-skq/sys/i386/ibcs2/ibcs2_fcntl.c
dfr 79d2dfdaa6 Add the new kernel-mode NFS Lock Manager. To use it instead of the 
user-mode lock manager, build a kernel with the NFSLOCKD option and
add '-k' to 'rpc_lockd_flags' in rc.conf.

Highlights include:

* Thread-safe kernel RPC client - many threads can use the same RPC
  client handle safely with replies being de-multiplexed at the socket
  upcall (typically driven directly by the NIC interrupt) and handed
  off to whichever thread matches the reply. For UDP sockets, many RPC
  clients can share the same socket. This allows the use of a single
  privileged UDP port number to talk to an arbitrary number of remote
  hosts.

* Single-threaded kernel RPC server. Adding support for multi-threaded
  server would be relatively straightforward and would follow
  approximately the Solaris KPI. A single thread should be sufficient
  for the NLM since it should rarely block in normal operation.

* Kernel mode NLM server supporting cancel requests and granted
  callbacks. I've tested the NLM server reasonably extensively - it
  passes both my own tests and the NFS Connectathon locking tests
  running on Solaris, Mac OS X and Ubuntu Linux.

* Userland NLM client supported. While the NLM server doesn't have
  support for the local NFS client's locking needs, it does have to
  field async replies and granted callbacks from remote NLMs that the
  local client has contacted. We relay these replies to the userland
  rpc.lockd over a local domain RPC socket.

* Robust deadlock detection for the local lock manager. In particular
  it will detect deadlocks caused by a lock request that covers more
  than one blocking request. As required by the NLM protocol, all
  deadlock detection happens synchronously - a user is guaranteed that
  if a lock request isn't rejected immediately, the lock will
  eventually be granted. The old system allowed for a 'deferred
  deadlock' condition where a blocked lock request could wake up and
  find that some other deadlock-causing lock owner had beaten them to
  the lock.

* Since both local and remote locks are managed by the same kernel
  locking code, local and remote processes can safely use file locks
  for mutual exclusion. Local processes have no fairness advantage
  compared to remote processes when contending to lock a region that
  has just been unlocked - the local lock manager enforces a strict
  first-come first-served model for both local and remote lockers.

Sponsored by:	Isilon Systems
PR:		95247 107555 115524 116679
MFC after:	2 weeks
2008-03-26 15:23:12 +00:00

315 lines
8.1 KiB
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/*-
* Copyright (c) 1995 Scott Bartram
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_spx_hack.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/ttycom.h>
#include <i386/ibcs2/ibcs2_fcntl.h>
#include <i386/ibcs2/ibcs2_signal.h>
#include <i386/ibcs2/ibcs2_proto.h>
#include <i386/ibcs2/ibcs2_util.h>
static void cvt_iflock2flock(struct ibcs2_flock *, struct flock *);
static void cvt_flock2iflock(struct flock *, struct ibcs2_flock *);
static int cvt_o_flags(int);
static int oflags2ioflags(int);
static int ioflags2oflags(int);
static int
cvt_o_flags(flags)
int flags;
{
int r = 0;
/* convert mode into NetBSD mode */
if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
if (flags & IBCS2_O_RDWR) r |= O_RDWR;
if (flags & (IBCS2_O_NDELAY | IBCS2_O_NONBLOCK)) r |= O_NONBLOCK;
if (flags & IBCS2_O_APPEND) r |= O_APPEND;
if (flags & IBCS2_O_SYNC) r |= O_FSYNC;
if (flags & IBCS2_O_CREAT) r |= O_CREAT;
if (flags & IBCS2_O_TRUNC) r |= O_TRUNC /* | O_CREAT ??? */;
if (flags & IBCS2_O_EXCL) r |= O_EXCL;
if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
if (flags & IBCS2_O_PRIV) r |= O_EXLOCK;
if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
return r;
}
static void
cvt_flock2iflock(flp, iflp)
struct flock *flp;
struct ibcs2_flock *iflp;
{
switch (flp->l_type) {
case F_RDLCK:
iflp->l_type = IBCS2_F_RDLCK;
break;
case F_WRLCK:
iflp->l_type = IBCS2_F_WRLCK;
break;
case F_UNLCK:
iflp->l_type = IBCS2_F_UNLCK;
break;
}
iflp->l_whence = (short)flp->l_whence;
iflp->l_start = (ibcs2_off_t)flp->l_start;
iflp->l_len = (ibcs2_off_t)flp->l_len;
iflp->l_sysid = flp->l_sysid;
iflp->l_pid = (ibcs2_pid_t)flp->l_pid;
}
#ifdef DEBUG_IBCS2
static void
print_flock(struct flock *flp)
{
printf("flock: start=%x len=%x pid=%d type=%d whence=%d\n",
(int)flp->l_start, (int)flp->l_len, (int)flp->l_pid,
flp->l_type, flp->l_whence);
}
#endif
static void
cvt_iflock2flock(iflp, flp)
struct ibcs2_flock *iflp;
struct flock *flp;
{
flp->l_start = (off_t)iflp->l_start;
flp->l_len = (off_t)iflp->l_len;
flp->l_pid = (pid_t)iflp->l_pid;
switch (iflp->l_type) {
case IBCS2_F_RDLCK:
flp->l_type = F_RDLCK;
break;
case IBCS2_F_WRLCK:
flp->l_type = F_WRLCK;
break;
case IBCS2_F_UNLCK:
flp->l_type = F_UNLCK;
break;
}
flp->l_whence = iflp->l_whence;
flp->l_sysid = iflp->l_sysid;
}
/* convert iBCS2 mode into NetBSD mode */
static int
ioflags2oflags(flags)
int flags;
{
int r = 0;
if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
if (flags & IBCS2_O_RDWR) r |= O_RDWR;
if (flags & IBCS2_O_NDELAY) r |= O_NONBLOCK;
if (flags & IBCS2_O_APPEND) r |= O_APPEND;
if (flags & IBCS2_O_SYNC) r |= O_FSYNC;
if (flags & IBCS2_O_NONBLOCK) r |= O_NONBLOCK;
if (flags & IBCS2_O_CREAT) r |= O_CREAT;
if (flags & IBCS2_O_TRUNC) r |= O_TRUNC;
if (flags & IBCS2_O_EXCL) r |= O_EXCL;
if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
return r;
}
/* convert NetBSD mode into iBCS2 mode */
static int
oflags2ioflags(flags)
int flags;
{
int r = 0;
if (flags & O_RDONLY) r |= IBCS2_O_RDONLY;
if (flags & O_WRONLY) r |= IBCS2_O_WRONLY;
if (flags & O_RDWR) r |= IBCS2_O_RDWR;
if (flags & O_NDELAY) r |= IBCS2_O_NONBLOCK;
if (flags & O_APPEND) r |= IBCS2_O_APPEND;
if (flags & O_FSYNC) r |= IBCS2_O_SYNC;
if (flags & O_NONBLOCK) r |= IBCS2_O_NONBLOCK;
if (flags & O_CREAT) r |= IBCS2_O_CREAT;
if (flags & O_TRUNC) r |= IBCS2_O_TRUNC;
if (flags & O_EXCL) r |= IBCS2_O_EXCL;
if (flags & O_NOCTTY) r |= IBCS2_O_NOCTTY;
return r;
}
int
ibcs2_open(td, uap)
struct thread *td;
struct ibcs2_open_args *uap;
{
struct proc *p;
char *path;
int flags, noctty, ret;
p = td->td_proc;
noctty = uap->flags & IBCS2_O_NOCTTY;
flags = cvt_o_flags(uap->flags);
if (uap->flags & O_CREAT)
CHECKALTCREAT(td, uap->path, &path);
else
CHECKALTEXIST(td, uap->path, &path);
ret = kern_open(td, path, UIO_SYSSPACE, flags, uap->mode);
#ifdef SPX_HACK
if (ret == ENXIO) {
if (!strcmp(path, "/compat/ibcs2/dev/spx"))
ret = spx_open(td);
free(path, M_TEMP);
} else
#endif /* SPX_HACK */
free(path, M_TEMP);
PROC_LOCK(p);
if (!ret && !noctty && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
struct file *fp;
int error;
error = fget(td, td->td_retval[0], &fp);
PROC_UNLOCK(p);
if (error)
return (EBADF);
/* ignore any error, just give it a try */
if (fp->f_type == DTYPE_VNODE)
fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, td->td_ucred,
td);
fdrop(fp, td);
} else
PROC_UNLOCK(p);
return ret;
}
int
ibcs2_creat(td, uap)
struct thread *td;
struct ibcs2_creat_args *uap;
{
char *path;
int error;
CHECKALTCREAT(td, uap->path, &path);
error = kern_open(td, path, UIO_SYSSPACE, O_WRONLY | O_CREAT | O_TRUNC,
uap->mode);
free(path, M_TEMP);
return (error);
}
int
ibcs2_access(td, uap)
struct thread *td;
struct ibcs2_access_args *uap;
{
char *path;
int error;
CHECKALTEXIST(td, uap->path, &path);
error = kern_access(td, path, UIO_SYSSPACE, uap->flags);
free(path, M_TEMP);
return (error);
}
int
ibcs2_fcntl(td, uap)
struct thread *td;
struct ibcs2_fcntl_args *uap;
{
intptr_t arg;
int error;
struct flock fl;
struct ibcs2_flock ifl;
arg = (intptr_t)uap->arg;
switch(uap->cmd) {
case IBCS2_F_DUPFD:
return (kern_fcntl(td, uap->fd, F_DUPFD, arg));
case IBCS2_F_GETFD:
return (kern_fcntl(td, uap->fd, F_GETFD, arg));
case IBCS2_F_SETFD:
return (kern_fcntl(td, uap->fd, F_SETFD, arg));
case IBCS2_F_GETFL:
error = kern_fcntl(td, uap->fd, F_GETFL, arg);
if (error)
return error;
td->td_retval[0] = oflags2ioflags(td->td_retval[0]);
return error;
case IBCS2_F_SETFL:
return (kern_fcntl(td, uap->fd, F_SETFL,
ioflags2oflags(arg)));
case IBCS2_F_GETLK:
{
error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
ibcs2_flock_len);
if (error)
return error;
cvt_iflock2flock(&ifl, &fl);
error = kern_fcntl(td, uap->fd, F_GETLK, (intptr_t)&fl);
if (error)
return error;
cvt_flock2iflock(&fl, &ifl);
return copyout((caddr_t)&ifl, (caddr_t)uap->arg,
ibcs2_flock_len);
}
case IBCS2_F_SETLK:
{
error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
ibcs2_flock_len);
if (error)
return error;
cvt_iflock2flock(&ifl, &fl);
return (kern_fcntl(td, uap->fd, F_SETLK, (intptr_t)&fl));
}
case IBCS2_F_SETLKW:
{
error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
ibcs2_flock_len);
if (error)
return error;
cvt_iflock2flock(&ifl, &fl);
return (kern_fcntl(td, uap->fd, F_SETLKW, (intptr_t)&fl));
}
}
return ENOSYS;
}
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