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HardenedBSD/sys/i386/ibcs2/ibcs2_stat.c
Alfred Perlstein 426da3bcfb SMP Lock struct file, filedesc and the global file list. 
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.
2002-01-13 11:58:06 +00:00

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/*
* Copyright (c) 1995 Scott Bartram
* Copyright (c) 1995 Steven Wallace
* 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <i386/ibcs2/ibcs2_signal.h>
#include <i386/ibcs2/ibcs2_stat.h>
#include <i386/ibcs2/ibcs2_statfs.h>
#include <i386/ibcs2/ibcs2_proto.h>
#include <i386/ibcs2/ibcs2_util.h>
#include <i386/ibcs2/ibcs2_utsname.h>
static void bsd_stat2ibcs_stat __P((struct stat *, struct ibcs2_stat *));
static int cvt_statfs __P((struct statfs *, caddr_t, int));
static void
bsd_stat2ibcs_stat(st, st4)
struct stat *st;
struct ibcs2_stat *st4;
{
bzero(st4, sizeof(*st4));
st4->st_dev = (ibcs2_dev_t)st->st_dev;
st4->st_ino = (ibcs2_ino_t)st->st_ino;
st4->st_mode = (ibcs2_mode_t)st->st_mode;
st4->st_nlink= (ibcs2_nlink_t)st->st_nlink;
st4->st_uid = (ibcs2_uid_t)st->st_uid;
st4->st_gid = (ibcs2_gid_t)st->st_gid;
st4->st_rdev = (ibcs2_dev_t)st->st_rdev;
if (st->st_size < (quad_t)1 << 32)
st4->st_size = (ibcs2_off_t)st->st_size;
else
st4->st_size = -2;
st4->st_atim = (ibcs2_time_t)st->st_atime;
st4->st_mtim = (ibcs2_time_t)st->st_mtime;
st4->st_ctim = (ibcs2_time_t)st->st_ctime;
}
static int
cvt_statfs(sp, buf, len)
struct statfs *sp;
caddr_t buf;
int len;
{
struct ibcs2_statfs ssfs;
bzero(&ssfs, sizeof ssfs);
ssfs.f_fstyp = 0;
ssfs.f_bsize = sp->f_bsize;
ssfs.f_frsize = 0;
ssfs.f_blocks = sp->f_blocks;
ssfs.f_bfree = sp->f_bfree;
ssfs.f_files = sp->f_files;
ssfs.f_ffree = sp->f_ffree;
ssfs.f_fname[0] = 0;
ssfs.f_fpack[0] = 0;
return copyout((caddr_t)&ssfs, buf, len);
}
int
ibcs2_statfs(td, uap)
struct thread *td;
struct ibcs2_statfs_args *uap;
{
register struct mount *mp;
register struct statfs *sp;
int error;
struct nameidata nd;
caddr_t sg = stackgap_init();
CHECKALTEXIST(td, &sg, SCARG(uap, path));
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(nd.ni_vp);
if ((error = VFS_STATFS(mp, sp, td)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return cvt_statfs(sp, (caddr_t)SCARG(uap, buf), SCARG(uap, len));
}
int
ibcs2_fstatfs(td, uap)
struct thread *td;
struct ibcs2_fstatfs_args *uap;
{
struct file *fp;
struct mount *mp;
register struct statfs *sp;
int error;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, td);
fdrop(fp, td);
if (error != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return cvt_statfs(sp, (caddr_t)SCARG(uap, buf), SCARG(uap, len));
}
int
ibcs2_stat(td, uap)
struct thread *td;
struct ibcs2_stat_args *uap;
{
struct stat st;
struct ibcs2_stat ibcs2_st;
struct stat_args cup;
int error;
caddr_t sg = stackgap_init();
CHECKALTEXIST(td, &sg, SCARG(uap, path));
SCARG(&cup, path) = SCARG(uap, path);
SCARG(&cup, ub) = stackgap_alloc(&sg, sizeof(st));
if ((error = stat(td, &cup)) != 0)
return error;
if ((error = copyin(SCARG(&cup, ub), &st, sizeof(st))) != 0)
return error;
bsd_stat2ibcs_stat(&st, &ibcs2_st);
return copyout((caddr_t)&ibcs2_st, (caddr_t)SCARG(uap, st),
ibcs2_stat_len);
}
int
ibcs2_lstat(td, uap)
struct thread *td;
struct ibcs2_lstat_args *uap;
{
struct stat st;
struct ibcs2_stat ibcs2_st;
struct lstat_args cup;
int error;
caddr_t sg = stackgap_init();
CHECKALTEXIST(td, &sg, SCARG(uap, path));
SCARG(&cup, path) = SCARG(uap, path);
SCARG(&cup, ub) = stackgap_alloc(&sg, sizeof(st));
if ((error = lstat(td, &cup)) != 0)
return error;
if ((error = copyin(SCARG(&cup, ub), &st, sizeof(st))) != 0)
return error;
bsd_stat2ibcs_stat(&st, &ibcs2_st);
return copyout((caddr_t)&ibcs2_st, (caddr_t)SCARG(uap, st),
ibcs2_stat_len);
}
int
ibcs2_fstat(td, uap)
struct thread *td;
struct ibcs2_fstat_args *uap;
{
struct stat st;
struct ibcs2_stat ibcs2_st;
struct fstat_args cup;
int error;
caddr_t sg = stackgap_init();
SCARG(&cup, fd) = SCARG(uap, fd);
SCARG(&cup, sb) = stackgap_alloc(&sg, sizeof(st));
if ((error = fstat(td, &cup)) != 0)
return error;
if ((error = copyin(SCARG(&cup, sb), &st, sizeof(st))) != 0)
return error;
bsd_stat2ibcs_stat(&st, &ibcs2_st);
return copyout((caddr_t)&ibcs2_st, (caddr_t)SCARG(uap, st),
ibcs2_stat_len);
}
int
ibcs2_utssys(td, uap)
struct thread *td;
struct ibcs2_utssys_args *uap;
{
switch (SCARG(uap, flag)) {
case 0: /* uname(2) */
{
char machine_name[9], *p;
struct ibcs2_utsname sut;
bzero(&sut, ibcs2_utsname_len);
strncpy(sut.sysname,
IBCS2_UNAME_SYSNAME, sizeof(sut.sysname) - 1);
strncpy(sut.release,
IBCS2_UNAME_RELEASE, sizeof(sut.release) - 1);
strncpy(sut.version,
IBCS2_UNAME_VERSION, sizeof(sut.version) - 1);
strncpy(machine_name, hostname, sizeof(machine_name) - 1);
machine_name[sizeof(machine_name) - 1] = 0;
p = index(machine_name, '.');
if ( p )
*p = '\0';
strncpy(sut.nodename, machine_name, sizeof(sut.nodename) - 1);
strncpy(sut.machine, machine, sizeof(sut.machine) - 1);
DPRINTF(("IBCS2 uname: sys=%s rel=%s ver=%s node=%s mach=%s\n",
sut.sysname, sut.release, sut.version, sut.nodename,
sut.machine));
return copyout((caddr_t)&sut, (caddr_t)SCARG(uap, a1),
ibcs2_utsname_len);
}
case 2: /* ustat(2) */
{
return ENOSYS; /* XXX - TODO */
}
default:
return ENOSYS;
}
}
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