426da3bcfb
Seigo Tanimura (tanimura) posted the initial delta.
I've polished it quite a bit reducing the need for locking and
adapting it for KSE.
Locks:
1 mutex in each filedesc
protects all the fields.
protects "struct file" initialization, while a struct file
is being changed from &badfileops -> &pipeops or something
the filedesc should be locked.
1 mutex in each struct file
protects the refcount fields.
doesn't protect anything else.
the flags used for garbage collection have been moved to
f_gcflag which was the FILLER short, this doesn't need
locking because the garbage collection is a single threaded
container.
could likely be made to use a pool mutex.
1 sx lock for the global filelist.
struct file * fhold(struct file *fp);
/* increments reference count on a file */
struct file * fhold_locked(struct file *fp);
/* like fhold but expects file to locked */
struct file * ffind_hold(struct thread *, int fd);
/* finds the struct file in thread, adds one reference and
returns it unlocked */
struct file * ffind_lock(struct thread *, int fd);
/* ffind_hold, but returns file locked */
I still have to smp-safe the fget cruft, I'll get to that asap.
336 lines
9.0 KiB
C
336 lines
9.0 KiB
C
/*
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* Copyright (c) 1995 Scott Bartram
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_spx_hack.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysproto.h>
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#include <sys/ttycom.h>
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#include <i386/ibcs2/ibcs2_fcntl.h>
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#include <i386/ibcs2/ibcs2_signal.h>
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#include <i386/ibcs2/ibcs2_proto.h>
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#include <i386/ibcs2/ibcs2_util.h>
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static void cvt_iflock2flock __P((struct ibcs2_flock *, struct flock *));
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static void cvt_flock2iflock __P((struct flock *, struct ibcs2_flock *));
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static int cvt_o_flags __P((int));
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static int oflags2ioflags __P((int));
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static int ioflags2oflags __P((int));
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static int
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cvt_o_flags(flags)
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int flags;
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{
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int r = 0;
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/* convert mode into NetBSD mode */
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if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
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if (flags & IBCS2_O_RDWR) r |= O_RDWR;
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if (flags & (IBCS2_O_NDELAY | IBCS2_O_NONBLOCK)) r |= O_NONBLOCK;
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if (flags & IBCS2_O_APPEND) r |= O_APPEND;
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if (flags & IBCS2_O_SYNC) r |= O_FSYNC;
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if (flags & IBCS2_O_CREAT) r |= O_CREAT;
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if (flags & IBCS2_O_TRUNC) r |= O_TRUNC /* | O_CREAT ??? */;
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if (flags & IBCS2_O_EXCL) r |= O_EXCL;
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if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
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if (flags & IBCS2_O_PRIV) r |= O_EXLOCK;
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if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
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return r;
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}
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static void
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cvt_flock2iflock(flp, iflp)
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struct flock *flp;
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struct ibcs2_flock *iflp;
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{
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switch (flp->l_type) {
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case F_RDLCK:
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iflp->l_type = IBCS2_F_RDLCK;
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break;
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case F_WRLCK:
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iflp->l_type = IBCS2_F_WRLCK;
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break;
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case F_UNLCK:
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iflp->l_type = IBCS2_F_UNLCK;
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break;
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}
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iflp->l_whence = (short)flp->l_whence;
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iflp->l_start = (ibcs2_off_t)flp->l_start;
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iflp->l_len = (ibcs2_off_t)flp->l_len;
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iflp->l_sysid = 0;
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iflp->l_pid = (ibcs2_pid_t)flp->l_pid;
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}
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#ifdef DEBUG_IBCS2
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static void
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print_flock(struct flock *flp)
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{
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printf("flock: start=%x len=%x pid=%d type=%d whence=%d\n",
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(int)flp->l_start, (int)flp->l_len, (int)flp->l_pid,
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flp->l_type, flp->l_whence);
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}
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#endif
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static void
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cvt_iflock2flock(iflp, flp)
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struct ibcs2_flock *iflp;
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struct flock *flp;
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{
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flp->l_start = (off_t)iflp->l_start;
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flp->l_len = (off_t)iflp->l_len;
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flp->l_pid = (pid_t)iflp->l_pid;
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switch (iflp->l_type) {
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case IBCS2_F_RDLCK:
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flp->l_type = F_RDLCK;
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break;
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case IBCS2_F_WRLCK:
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flp->l_type = F_WRLCK;
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break;
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case IBCS2_F_UNLCK:
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flp->l_type = F_UNLCK;
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break;
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}
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flp->l_whence = iflp->l_whence;
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}
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/* convert iBCS2 mode into NetBSD mode */
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static int
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ioflags2oflags(flags)
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int flags;
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{
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int r = 0;
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if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
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if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
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if (flags & IBCS2_O_RDWR) r |= O_RDWR;
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if (flags & IBCS2_O_NDELAY) r |= O_NONBLOCK;
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if (flags & IBCS2_O_APPEND) r |= O_APPEND;
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if (flags & IBCS2_O_SYNC) r |= O_FSYNC;
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if (flags & IBCS2_O_NONBLOCK) r |= O_NONBLOCK;
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if (flags & IBCS2_O_CREAT) r |= O_CREAT;
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if (flags & IBCS2_O_TRUNC) r |= O_TRUNC;
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if (flags & IBCS2_O_EXCL) r |= O_EXCL;
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if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
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return r;
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}
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/* convert NetBSD mode into iBCS2 mode */
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static int
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oflags2ioflags(flags)
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int flags;
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{
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int r = 0;
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if (flags & O_RDONLY) r |= IBCS2_O_RDONLY;
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if (flags & O_WRONLY) r |= IBCS2_O_WRONLY;
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if (flags & O_RDWR) r |= IBCS2_O_RDWR;
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if (flags & O_NDELAY) r |= IBCS2_O_NONBLOCK;
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if (flags & O_APPEND) r |= IBCS2_O_APPEND;
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if (flags & O_FSYNC) r |= IBCS2_O_SYNC;
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if (flags & O_NONBLOCK) r |= IBCS2_O_NONBLOCK;
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if (flags & O_CREAT) r |= IBCS2_O_CREAT;
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if (flags & O_TRUNC) r |= IBCS2_O_TRUNC;
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if (flags & O_EXCL) r |= IBCS2_O_EXCL;
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if (flags & O_NOCTTY) r |= IBCS2_O_NOCTTY;
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return r;
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}
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int
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ibcs2_open(td, uap)
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struct thread *td;
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struct ibcs2_open_args *uap;
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{
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struct proc *p = td->td_proc;
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int noctty = SCARG(uap, flags) & IBCS2_O_NOCTTY;
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int ret;
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caddr_t sg = stackgap_init();
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SCARG(uap, flags) = cvt_o_flags(SCARG(uap, flags));
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if (SCARG(uap, flags) & O_CREAT)
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CHECKALTCREAT(td, &sg, SCARG(uap, path));
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else
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CHECKALTEXIST(td, &sg, SCARG(uap, path));
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ret = open(td, (struct open_args *)uap);
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#ifdef SPX_HACK
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if (ret == ENXIO) {
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if (!strcmp(SCARG(uap, path), "/compat/ibcs2/dev/spx"))
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ret = spx_open(td, uap);
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} else
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#endif /* SPX_HACK */
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PROC_LOCK(p);
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if (!ret && !noctty && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
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struct file *fp;
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fp = ffind_hold(td, td->td_retval[0]);
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PROC_UNLOCK(p);
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if (fp == NULL)
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return (EBADF);
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/* ignore any error, just give it a try */
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if (fp->f_type == DTYPE_VNODE)
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fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, td);
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fdrop(fp, td);
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} else
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PROC_UNLOCK(p);
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return ret;
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}
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int
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ibcs2_creat(td, uap)
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struct thread *td;
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struct ibcs2_creat_args *uap;
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{
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struct open_args cup;
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caddr_t sg = stackgap_init();
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CHECKALTCREAT(td, &sg, SCARG(uap, path));
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SCARG(&cup, path) = SCARG(uap, path);
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SCARG(&cup, mode) = SCARG(uap, mode);
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SCARG(&cup, flags) = O_WRONLY | O_CREAT | O_TRUNC;
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return open(td, &cup);
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}
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int
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ibcs2_access(td, uap)
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struct thread *td;
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struct ibcs2_access_args *uap;
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{
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struct access_args cup;
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caddr_t sg = stackgap_init();
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CHECKALTEXIST(td, &sg, SCARG(uap, path));
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SCARG(&cup, path) = SCARG(uap, path);
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SCARG(&cup, flags) = SCARG(uap, flags);
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return access(td, &cup);
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}
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int
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ibcs2_fcntl(td, uap)
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struct thread *td;
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struct ibcs2_fcntl_args *uap;
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{
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int error;
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struct fcntl_args fa;
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struct flock *flp;
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struct ibcs2_flock ifl;
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switch(SCARG(uap, cmd)) {
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case IBCS2_F_DUPFD:
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_DUPFD;
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SCARG(&fa, arg) = (/* XXX */ int)SCARG(uap, arg);
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return fcntl(td, &fa);
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case IBCS2_F_GETFD:
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_GETFD;
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SCARG(&fa, arg) = (/* XXX */ int)SCARG(uap, arg);
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return fcntl(td, &fa);
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case IBCS2_F_SETFD:
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_SETFD;
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SCARG(&fa, arg) = (/* XXX */ int)SCARG(uap, arg);
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return fcntl(td, &fa);
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case IBCS2_F_GETFL:
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_GETFL;
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SCARG(&fa, arg) = (/* XXX */ int)SCARG(uap, arg);
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error = fcntl(td, &fa);
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if (error)
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return error;
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td->td_retval[0] = oflags2ioflags(td->td_retval[0]);
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return error;
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case IBCS2_F_SETFL:
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_SETFL;
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SCARG(&fa, arg) = (/* XXX */ int)
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ioflags2oflags((int)SCARG(uap, arg));
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return fcntl(td, &fa);
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case IBCS2_F_GETLK:
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{
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caddr_t sg = stackgap_init();
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flp = stackgap_alloc(&sg, sizeof(*flp));
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error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
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ibcs2_flock_len);
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if (error)
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return error;
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cvt_iflock2flock(&ifl, flp);
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_GETLK;
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SCARG(&fa, arg) = (/* XXX */ int)flp;
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error = fcntl(td, &fa);
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if (error)
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return error;
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cvt_flock2iflock(flp, &ifl);
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return copyout((caddr_t)&ifl, (caddr_t)SCARG(uap, arg),
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ibcs2_flock_len);
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}
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case IBCS2_F_SETLK:
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{
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caddr_t sg = stackgap_init();
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flp = stackgap_alloc(&sg, sizeof(*flp));
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error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
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ibcs2_flock_len);
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if (error)
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return error;
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cvt_iflock2flock(&ifl, flp);
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_SETLK;
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SCARG(&fa, arg) = (/* XXX */ int)flp;
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return fcntl(td, &fa);
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}
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case IBCS2_F_SETLKW:
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{
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caddr_t sg = stackgap_init();
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flp = stackgap_alloc(&sg, sizeof(*flp));
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error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
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ibcs2_flock_len);
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if (error)
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return error;
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cvt_iflock2flock(&ifl, flp);
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SCARG(&fa, fd) = SCARG(uap, fd);
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SCARG(&fa, cmd) = F_SETLKW;
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SCARG(&fa, arg) = (/* XXX */ int)flp;
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return fcntl(td, &fa);
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}
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}
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return ENOSYS;
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}
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