6bdfe06ad9
* lockstatus() and VOP_ISLOCKED() gets a new process argument and a new return value: LK_EXCLOTHER, when the lock is held exclusively by another process. * The ASSERT_VOP_(UN)LOCKED family is extended to use what this gives them * Extend the vnode_if.src format to allow more exact specification than locked/unlocked. This commit should not do any semantic changes unless you are using DEBUG_VFS_LOCKS. Discussed with: grog, mch, peter, phk Reviewed by: peter
620 lines
14 KiB
C
620 lines
14 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed
|
|
* to Berkeley by John Heidemann of the UCLA Ficus project.
|
|
*
|
|
* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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/buf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/poll.h>
|
|
|
|
static int vop_nostrategy __P((struct vop_strategy_args *));
|
|
|
|
/*
|
|
* This vnode table stores what we want to do if the filesystem doesn't
|
|
* implement a particular VOP.
|
|
*
|
|
* If there is no specific entry here, we will return EOPNOTSUPP.
|
|
*
|
|
*/
|
|
|
|
vop_t **default_vnodeop_p;
|
|
static struct vnodeopv_entry_desc default_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_eopnotsupp },
|
|
{ &vop_abortop_desc, (vop_t *) vop_null },
|
|
{ &vop_advlock_desc, (vop_t *) vop_einval },
|
|
{ &vop_bwrite_desc, (vop_t *) vop_stdbwrite },
|
|
{ &vop_close_desc, (vop_t *) vop_null },
|
|
{ &vop_fsync_desc, (vop_t *) vop_null },
|
|
{ &vop_ioctl_desc, (vop_t *) vop_enotty },
|
|
{ &vop_islocked_desc, (vop_t *) vop_noislocked },
|
|
{ &vop_lease_desc, (vop_t *) vop_null },
|
|
{ &vop_lock_desc, (vop_t *) vop_nolock },
|
|
{ &vop_mmap_desc, (vop_t *) vop_einval },
|
|
{ &vop_open_desc, (vop_t *) vop_null },
|
|
{ &vop_pathconf_desc, (vop_t *) vop_einval },
|
|
{ &vop_poll_desc, (vop_t *) vop_nopoll },
|
|
{ &vop_readlink_desc, (vop_t *) vop_einval },
|
|
{ &vop_reallocblks_desc, (vop_t *) vop_eopnotsupp },
|
|
{ &vop_revoke_desc, (vop_t *) vop_revoke },
|
|
{ &vop_strategy_desc, (vop_t *) vop_nostrategy },
|
|
{ &vop_unlock_desc, (vop_t *) vop_nounlock },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static struct vnodeopv_desc default_vnodeop_opv_desc =
|
|
{ &default_vnodeop_p, default_vnodeop_entries };
|
|
|
|
VNODEOP_SET(default_vnodeop_opv_desc);
|
|
|
|
int
|
|
vop_eopnotsupp(struct vop_generic_args *ap)
|
|
{
|
|
/*
|
|
printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
|
|
*/
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vop_ebadf(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
int
|
|
vop_enotty(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (ENOTTY);
|
|
}
|
|
|
|
int
|
|
vop_einval(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
vop_null(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_defaultop(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap));
|
|
}
|
|
|
|
int
|
|
vop_panic(struct vop_generic_args *ap)
|
|
{
|
|
|
|
printf("vop_panic[%s]\n", ap->a_desc->vdesc_name);
|
|
panic("Filesystem goof");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vop_nostrategy:
|
|
*
|
|
* Strategy routine for VFS devices that have none.
|
|
*
|
|
* B_ERROR and B_INVAL must be cleared prior to calling any strategy
|
|
* routine. Typically this is done for a B_READ strategy call. Typically
|
|
* B_INVAL is assumed to already be clear prior to a write and should not
|
|
* be cleared manually unless you just made the buffer invalid. B_ERROR
|
|
* should be cleared either way.
|
|
*/
|
|
|
|
static int
|
|
vop_nostrategy (struct vop_strategy_args *ap)
|
|
{
|
|
printf("No strategy for buffer at %p\n", ap->a_bp);
|
|
vprint("", ap->a_vp);
|
|
vprint("", ap->a_bp->b_vp);
|
|
ap->a_bp->b_flags |= B_ERROR;
|
|
ap->a_bp->b_error = EOPNOTSUPP;
|
|
biodone(ap->a_bp);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vop_stdpathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
return (0);
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Standard lock, unlock and islocked functions.
|
|
*
|
|
* These depend on the lock structure being the first element in the
|
|
* inode, ie: vp->v_data points to the the lock!
|
|
*/
|
|
int
|
|
vop_stdlock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct lock *l;
|
|
|
|
if ((l = (struct lock *)ap->a_vp->v_data) == NULL) {
|
|
if (ap->a_flags & LK_INTERLOCK)
|
|
simple_unlock(&ap->a_vp->v_interlock);
|
|
return 0;
|
|
}
|
|
|
|
#ifndef DEBUG_LOCKS
|
|
return (lockmgr(l, ap->a_flags, &ap->a_vp->v_interlock, ap->a_p));
|
|
#else
|
|
return (debuglockmgr(l, ap->a_flags, &ap->a_vp->v_interlock, ap->a_p,
|
|
"vop_stdlock", ap->a_vp->filename, ap->a_vp->line));
|
|
#endif
|
|
}
|
|
|
|
int
|
|
vop_stdunlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct lock *l;
|
|
|
|
if ((l = (struct lock *)ap->a_vp->v_data) == NULL) {
|
|
if (ap->a_flags & LK_INTERLOCK)
|
|
simple_unlock(&ap->a_vp->v_interlock);
|
|
return 0;
|
|
}
|
|
|
|
return (lockmgr(l, ap->a_flags | LK_RELEASE, &ap->a_vp->v_interlock,
|
|
ap->a_p));
|
|
}
|
|
|
|
int
|
|
vop_stdislocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct lock *l;
|
|
|
|
if ((l = (struct lock *)ap->a_vp->v_data) == NULL)
|
|
return 0;
|
|
|
|
return (lockstatus(l, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* Return true for select/poll.
|
|
*/
|
|
int
|
|
vop_nopoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
/*
|
|
* Return true for read/write. If the user asked for something
|
|
* special, return POLLNVAL, so that clients have a way of
|
|
* determining reliably whether or not the extended
|
|
* functionality is present without hard-coding knowledge
|
|
* of specific filesystem implementations.
|
|
*/
|
|
if (ap->a_events & ~POLLSTANDARD)
|
|
return (POLLNVAL);
|
|
|
|
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
/*
|
|
* Implement poll for local filesystems that support it.
|
|
*/
|
|
int
|
|
vop_stdpoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
if ((ap->a_events & ~POLLSTANDARD) == 0)
|
|
return (ap->a_events & (POLLRDNORM|POLLWRNORM));
|
|
return (vn_pollrecord(ap->a_vp, ap->a_p, ap->a_events));
|
|
}
|
|
|
|
int
|
|
vop_stdbwrite(ap)
|
|
struct vop_bwrite_args *ap;
|
|
{
|
|
return (bwrite(ap->a_bp));
|
|
}
|
|
|
|
/*
|
|
* Stubs to use when there is no locking to be done on the underlying object.
|
|
* A minimal shared lock is necessary to ensure that the underlying object
|
|
* is not revoked while an operation is in progress. So, an active shared
|
|
* count is maintained in an auxillary vnode lock structure.
|
|
*/
|
|
int
|
|
vop_sharedlock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
/*
|
|
* This code cannot be used until all the non-locking filesystems
|
|
* (notably NFS) are converted to properly lock and release nodes.
|
|
* Also, certain vnode operations change the locking state within
|
|
* the operation (create, mknod, remove, link, rename, mkdir, rmdir,
|
|
* and symlink). Ideally these operations should not change the
|
|
* lock state, but should be changed to let the caller of the
|
|
* function unlock them. Otherwise all intermediate vnode layers
|
|
* (such as union, umapfs, etc) must catch these functions to do
|
|
* the necessary locking at their layer. Note that the inactive
|
|
* and lookup operations also change their lock state, but this
|
|
* cannot be avoided, so these two operations will always need
|
|
* to be handled in intermediate layers.
|
|
*/
|
|
struct vnode *vp = ap->a_vp;
|
|
int vnflags, flags = ap->a_flags;
|
|
|
|
if (vp->v_vnlock == NULL) {
|
|
if ((flags & LK_TYPE_MASK) == LK_DRAIN)
|
|
return (0);
|
|
MALLOC(vp->v_vnlock, struct lock *, sizeof(struct lock),
|
|
M_VNODE, M_WAITOK);
|
|
lockinit(vp->v_vnlock, PVFS, "vnlock", 0, LK_NOPAUSE);
|
|
}
|
|
switch (flags & LK_TYPE_MASK) {
|
|
case LK_DRAIN:
|
|
vnflags = LK_DRAIN;
|
|
break;
|
|
case LK_EXCLUSIVE:
|
|
#ifdef DEBUG_VFS_LOCKS
|
|
/*
|
|
* Normally, we use shared locks here, but that confuses
|
|
* the locking assertions.
|
|
*/
|
|
vnflags = LK_EXCLUSIVE;
|
|
break;
|
|
#endif
|
|
case LK_SHARED:
|
|
vnflags = LK_SHARED;
|
|
break;
|
|
case LK_UPGRADE:
|
|
case LK_EXCLUPGRADE:
|
|
case LK_DOWNGRADE:
|
|
return (0);
|
|
case LK_RELEASE:
|
|
default:
|
|
panic("vop_sharedlock: bad operation %d", flags & LK_TYPE_MASK);
|
|
}
|
|
if (flags & LK_INTERLOCK)
|
|
vnflags |= LK_INTERLOCK;
|
|
#ifndef DEBUG_LOCKS
|
|
return (lockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p));
|
|
#else
|
|
return (debuglockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p,
|
|
"vop_sharedlock", vp->filename, vp->line));
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Stubs to use when there is no locking to be done on the underlying object.
|
|
* A minimal shared lock is necessary to ensure that the underlying object
|
|
* is not revoked while an operation is in progress. So, an active shared
|
|
* count is maintained in an auxillary vnode lock structure.
|
|
*/
|
|
int
|
|
vop_nolock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
#ifdef notyet
|
|
/*
|
|
* This code cannot be used until all the non-locking filesystems
|
|
* (notably NFS) are converted to properly lock and release nodes.
|
|
* Also, certain vnode operations change the locking state within
|
|
* the operation (create, mknod, remove, link, rename, mkdir, rmdir,
|
|
* and symlink). Ideally these operations should not change the
|
|
* lock state, but should be changed to let the caller of the
|
|
* function unlock them. Otherwise all intermediate vnode layers
|
|
* (such as union, umapfs, etc) must catch these functions to do
|
|
* the necessary locking at their layer. Note that the inactive
|
|
* and lookup operations also change their lock state, but this
|
|
* cannot be avoided, so these two operations will always need
|
|
* to be handled in intermediate layers.
|
|
*/
|
|
struct vnode *vp = ap->a_vp;
|
|
int vnflags, flags = ap->a_flags;
|
|
|
|
if (vp->v_vnlock == NULL) {
|
|
if ((flags & LK_TYPE_MASK) == LK_DRAIN)
|
|
return (0);
|
|
MALLOC(vp->v_vnlock, struct lock *, sizeof(struct lock),
|
|
M_VNODE, M_WAITOK);
|
|
lockinit(vp->v_vnlock, PVFS, "vnlock", 0, LK_NOPAUSE);
|
|
}
|
|
switch (flags & LK_TYPE_MASK) {
|
|
case LK_DRAIN:
|
|
vnflags = LK_DRAIN;
|
|
break;
|
|
case LK_EXCLUSIVE:
|
|
case LK_SHARED:
|
|
vnflags = LK_SHARED;
|
|
break;
|
|
case LK_UPGRADE:
|
|
case LK_EXCLUPGRADE:
|
|
case LK_DOWNGRADE:
|
|
return (0);
|
|
case LK_RELEASE:
|
|
default:
|
|
panic("vop_nolock: bad operation %d", flags & LK_TYPE_MASK);
|
|
}
|
|
if (flags & LK_INTERLOCK)
|
|
vnflags |= LK_INTERLOCK;
|
|
return(lockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p));
|
|
#else /* for now */
|
|
/*
|
|
* Since we are not using the lock manager, we must clear
|
|
* the interlock here.
|
|
*/
|
|
if (ap->a_flags & LK_INTERLOCK)
|
|
simple_unlock(&ap->a_vp->v_interlock);
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Do the inverse of vop_nolock, handling the interlock in a compatible way.
|
|
*/
|
|
int
|
|
vop_nounlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
if (vp->v_vnlock == NULL) {
|
|
if (ap->a_flags & LK_INTERLOCK)
|
|
simple_unlock(&ap->a_vp->v_interlock);
|
|
return (0);
|
|
}
|
|
return (lockmgr(vp->v_vnlock, LK_RELEASE | ap->a_flags,
|
|
&ap->a_vp->v_interlock, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* Return whether or not the node is in use.
|
|
*/
|
|
int
|
|
vop_noislocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
if (vp->v_vnlock == NULL)
|
|
return (0);
|
|
return (lockstatus(vp->v_vnlock, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* vfs default ops
|
|
* used to fill the vfs fucntion table to get reasonable default return values.
|
|
*/
|
|
int
|
|
vfs_stdmount (mp, path, data, ndp, p)
|
|
struct mount *mp;
|
|
char *path;
|
|
caddr_t data;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdunmount (mp, mntflags, p)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdroot (mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstatfs (mp, sbp, p)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdvptofh (vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstart (mp, flags, p)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdquotactl (mp, cmds, uid, arg, p)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsync (mp, waitfor, cred, p)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdvget (mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdfhtovp (mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdcheckexp (mp, nam, extflagsp, credanonp)
|
|
struct mount *mp;
|
|
struct sockaddr *nam;
|
|
int *extflagsp;
|
|
struct ucred **credanonp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdinit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stduninit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
/* end of vfs default ops */
|