C++ NDFREE函数代码示例

static int
swap_file_open(struct chip_swap *swap, const char *swap_file)
{
	struct nameidata nd;
	int flags, error;

	NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, swap_file,
	    curthread);

	flags = FWRITE | FREAD | O_NOFOLLOW | O_CREAT | O_TRUNC;

	error = vn_open(&nd, &flags, CHIP_SWAP_CMODE, NULL);
	if (error) {
		nand_debug(NDBG_SIM,"Cannot create swap file %s", swap_file);
		NDFREE(&nd, NDF_ONLY_PNBUF);
		return (error);
	}

	swap->swap_cred = crhold(curthread->td_ucred);
	NDFREE(&nd, NDF_ONLY_PNBUF);

	/* We just unlock so we hold a reference */
	VOP_UNLOCK(nd.ni_vp, 0);

	swap->swap_vp = nd.ni_vp;

	return (0);
}

int
randomdev_write_file(const char *filename, void *buf, size_t length)
{
	struct nameidata nd;
	struct thread* td = curthread;
	int error;
	ssize_t resid;
	int flags;

	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td);
	flags = FWRITE | O_CREAT | O_TRUNC;
	error = vn_open(&nd, &flags, 0, NULL);
	if (error == 0) {
		NDFREE(&nd, NDF_ONLY_PNBUF);
		if (nd.ni_vp->v_type != VREG)
			error = ENOEXEC;
		else
			error = vn_rdwr(UIO_WRITE, nd.ni_vp, buf, length, 0, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);

		VOP_UNLOCK(nd.ni_vp, 0);
		vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
	}

	return (error);
}

static int
vfs_mountroot_readconf(struct thread *td, struct sbuf *sb)
{
	static char buf[128];
	struct nameidata nd;
	off_t ofs;
	ssize_t resid;
	int error, flags, len;

	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td);
	flags = FREAD;
	error = vn_open(&nd, &flags, 0, NULL);
	if (error)
		return (error);

	NDFREE(&nd, NDF_ONLY_PNBUF);
	ofs = 0;
	len = sizeof(buf) - 1;
	while (1) {
		error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs,
		    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
		    NOCRED, &resid, td);
		if (error)
			break;
		if (resid == len)
			break;
		buf[len - resid] = 0;
		sbuf_printf(sb, "%s", buf);
		ofs += len - resid;
	}

	VOP_UNLOCK(nd.ni_vp, 0);
	vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
	return (error);
}

int
linux_newstat(struct proc *p, struct linux_newstat_args *args)
{
    struct stat buf;
    struct nameidata nd;
    int error;
    caddr_t sg;

    sg = stackgap_init();
    CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
    printf("Linux-emul(%ld): newstat(%s, *)\n", (long)p->p_pid,
           args->path);
#endif

    NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
           args->path, p);
    error = namei(&nd);
    if (error)
        return (error);
    NDFREE(&nd, NDF_ONLY_PNBUF);

    error = vn_stat(nd.ni_vp, &buf, p);
    vput(nd.ni_vp);
    if (error)
        return (error);

    return (newstat_copyout(&buf, args->buf));
}

static void *
kobj_open_file_vnode(const char *file)
{
	struct thread *td = curthread;
	struct filedesc *fd;
	struct nameidata nd;
	int error, flags, vfslocked;

	fd = td->td_proc->p_fd;
	FILEDESC_XLOCK(fd);
	if (fd->fd_rdir == NULL) {
		fd->fd_rdir = rootvnode;
		vref(fd->fd_rdir);
	}
	if (fd->fd_cdir == NULL) {
		fd->fd_cdir = rootvnode;
		vref(fd->fd_cdir);
	}
	FILEDESC_XUNLOCK(fd);

	flags = FREAD | O_NOFOLLOW;
	NDINIT(&nd, LOOKUP, MPSAFE, UIO_SYSSPACE, file, td);
	error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL);
	if (error != 0)
		return (NULL);
	vfslocked = NDHASGIANT(&nd);
	NDFREE(&nd, NDF_ONLY_PNBUF);
	/* We just unlock so we hold a reference. */
	VOP_UNLOCK(nd.ni_vp, 0);
	VFS_UNLOCK_GIANT(vfslocked);
	return (nd.ni_vp);
}

int
alq_open_flags(struct alq **alqp, const char *file, struct ucred *cred, int cmode,
               int size, int flags)
{
    struct thread *td;
    struct nameidata nd;
    struct alq *alq;
    int oflags;
    int error;
    int vfslocked;

    KASSERT((size > 0), ("%s: size <= 0", __func__));

    *alqp = NULL;
    td = curthread;

    NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, file, td);
    oflags = FWRITE | O_NOFOLLOW | O_CREAT;

    error = vn_open_cred(&nd, &oflags, cmode, 0, cred, NULL);
    if (error)
        return (error);

    vfslocked = NDHASGIANT(&nd);
    NDFREE(&nd, NDF_ONLY_PNBUF);
    /* We just unlock so we hold a reference */
    VOP_UNLOCK(nd.ni_vp, 0);
    VFS_UNLOCK_GIANT(vfslocked);

    alq = bsd_malloc(sizeof(*alq), M_ALD, M_WAITOK|M_ZERO);
    alq->aq_vp = nd.ni_vp;
    alq->aq_cred = crhold(cred);

    mtx_init(&alq->aq_mtx, "ALD Queue", NULL, MTX_SPIN|MTX_QUIET);

    alq->aq_buflen = size;
    alq->aq_entmax = 0;
    alq->aq_entlen = 0;

    alq->aq_freebytes = alq->aq_buflen;
    alq->aq_entbuf = bsd_malloc(alq->aq_buflen, M_ALD, M_WAITOK|M_ZERO);
    alq->aq_writehead = alq->aq_writetail = 0;
    if (flags & ALQ_ORDERED)
        alq->aq_flags |= AQ_ORDERED;

    if ((error = ald_add(alq)) != 0) {
        alq_destroy(alq);
        return (error);
    }

    *alqp = alq;

    return (0);
}

/*
 * Look up a file name. Basically just initialize stuff and call namei().
 */
int
nfsrv_lookupfilename(struct nameidata *ndp, char *fname, NFSPROC_T *p)
{
	int error;

	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, fname, p);
	error = namei(ndp);
	if (!error) {
		NDFREE(ndp, NDF_ONLY_PNBUF);
	}
	return (error);
}

static int
parse_mount_dev_present(const char *dev)
{
	struct nameidata nd;
	int error;

	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread);
	error = namei(&nd);
	if (!error)
		vput(nd.ni_vp);
	NDFREE(&nd, NDF_ONLY_PNBUF);
	return (error != 0) ? 0 : 1;
}

int
osi_lookupname(char *aname, enum uio_seg seg, int followlink,
	       struct vnode **vpp)
{
    struct nameidata n;
    int flags, error, glocked;

#ifdef AFS_FBSD50_ENV
    glocked = ISAFS_GLOCK();
    if (glocked)
	AFS_GUNLOCK();
#endif

    flags = 0;
    flags = LOCKLEAF;
    if (followlink)
	flags |= FOLLOW;
    else
	flags |= NOFOLLOW;
#ifdef AFS_FBSD80_ENV
    flags |= MPSAFE; /* namei must take GIANT if needed */
#endif
    NDINIT(&n, LOOKUP, flags, seg, aname, curproc);
    if ((error = namei(&n)) != 0) {
#ifdef AFS_FBSD50_ENV
	if (glocked)
	    AFS_GLOCK();
#endif
	return error;
    }
    *vpp = n.ni_vp;
    /* XXX should we do this?  Usually NOT (matt) */
#if defined(AFS_FBSD80_ENV)
    /*VOP_UNLOCK(n.ni_vp, 0);*/
#elif defined(AFS_FBSD50_ENV)
    VOP_UNLOCK(n.ni_vp, 0, curthread);
#else
    VOP_UNLOCK(n.ni_vp, 0, curproc);
#endif
    NDFREE(&n, NDF_ONLY_PNBUF);
#ifdef AFS_FBSD50_ENV
    if (glocked)
	AFS_GLOCK();
#endif
    return 0;
}

static void *
kobj_open_file_vnode(const char *file)
{
	struct thread *td = curthread;
	struct nameidata nd;
	int error, flags;

	pwd_ensure_dirs();

	flags = FREAD | O_NOFOLLOW;
	NDINIT(&nd, LOOKUP, 0, UIO_SYSSPACE, file, td);
	error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL);
	if (error != 0)
		return (NULL);
	NDFREE(&nd, NDF_ONLY_PNBUF);
	/* We just unlock so we hold a reference. */
	VOP_UNLOCK(nd.ni_vp, 0);
	return (nd.ni_vp);
}

int
lookupnameat(char *dirname, enum uio_seg seg, enum symfollow follow,
    vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp)
{
	struct nameidata nd;
	int error, ltype;

	ASSERT(dirvpp == NULL);

	vref(startvp);
	ltype = VOP_ISLOCKED(startvp);
	VOP_UNLOCK(startvp, 0);
	NDINIT_ATVP(&nd, LOOKUP, LOCKLEAF | MPSAFE | follow, seg, dirname,
	    startvp, curthread);
	error = namei(&nd);
	*compvpp = nd.ni_vp;
	NDFREE(&nd, NDF_ONLY_PNBUF);
	vn_lock(startvp, ltype | LK_RETRY);
	return (error);
}

int
osi_lookupname(char *aname, enum uio_seg seg, int followlink,
	       struct vnode **vpp)
{
    struct nameidata n;
    int flags, error, glocked;

    glocked = ISAFS_GLOCK();
    if (glocked)
	AFS_GUNLOCK();

#if __FreeBSD_version >= 1000021 /* MPSAFE is gone for good! */
    flags = 0;
#else
    flags = MPSAFE; /* namei must take Giant if needed */
#endif
    if (followlink)
	flags |= FOLLOW;
    else
	flags |= NOFOLLOW;
    NDINIT(&n, LOOKUP, flags, seg, aname, curthread);
    if ((error = namei(&n)) != 0) {
	if (glocked)
	    AFS_GLOCK();
	return error;
    }
    *vpp = n.ni_vp;
    /* XXX should we do this?  Usually NOT (matt) */
#if defined(AFS_FBSD80_ENV)
    /*VOP_UNLOCK(n.ni_vp, 0);*/
#else
    VOP_UNLOCK(n.ni_vp, 0, curthread);
#endif
    NDFREE(&n, NDF_ONLY_PNBUF);
    if (glocked)
	AFS_GLOCK();
    return 0;
}

/*
 * Q_QUOTAON - set up a quota file for a particular filesystem.
 */
int
quotaon(struct thread *td, struct mount *mp, int type, void *fname)
{
    struct ufsmount *ump;
    struct vnode *vp, **vpp;
    struct vnode *mvp;
    struct dquot *dq;
    int error, flags;
    struct nameidata nd;

    error = priv_check(td, PRIV_UFS_QUOTAON);
    if (error != 0) {
        vfs_unbusy(mp);
        return (error);
    }

    if ((mp->mnt_flag & MNT_RDONLY) != 0) {
        vfs_unbusy(mp);
        return (EROFS);
    }

    ump = VFSTOUFS(mp);
    dq = NODQUOT;

    NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, td);
    flags = FREAD | FWRITE;
    vfs_ref(mp);
    vfs_unbusy(mp);
    error = vn_open(&nd, &flags, 0, NULL);
    if (error != 0) {
        vfs_rel(mp);
        return (error);
    }
    NDFREE(&nd, NDF_ONLY_PNBUF);
    vp = nd.ni_vp;
    error = vfs_busy(mp, MBF_NOWAIT);
    vfs_rel(mp);
    if (error == 0) {
        if (vp->v_type != VREG) {
            error = EACCES;
            vfs_unbusy(mp);
        }
    }
    if (error != 0) {
        VOP_UNLOCK(vp, 0);
        (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
        return (error);
    }

    UFS_LOCK(ump);
    if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) {
        UFS_UNLOCK(ump);
        VOP_UNLOCK(vp, 0);
        (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
        vfs_unbusy(mp);
        return (EALREADY);
    }
    ump->um_qflags[type] |= QTF_OPENING|QTF_CLOSING;
    UFS_UNLOCK(ump);
    if ((error = dqopen(vp, ump, type)) != 0) {
        VOP_UNLOCK(vp, 0);
        UFS_LOCK(ump);
        ump->um_qflags[type] &= ~(QTF_OPENING|QTF_CLOSING);
        UFS_UNLOCK(ump);
        (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
        vfs_unbusy(mp);
        return (error);
    }
    VOP_UNLOCK(vp, 0);
    MNT_ILOCK(mp);
    mp->mnt_flag |= MNT_QUOTA;
    MNT_IUNLOCK(mp);

    vpp = &ump->um_quotas[type];
    if (*vpp != vp)
        quotaoff1(td, mp, type);

    /*
     * When the directory vnode containing the quota file is
     * inactivated, due to the shared lookup of the quota file
     * vput()ing the dvp, the qsyncvp() call for the containing
     * directory would try to acquire the quota lock exclusive.
     * At the same time, lookup already locked the quota vnode
     * shared.  Mark the quota vnode lock as allowing recursion
     * and automatically converting shared locks to exclusive.
     *
     * Also mark quota vnode as system.
     */
    vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    vp->v_vflag |= VV_SYSTEM;
    VN_LOCK_AREC(vp);
    VN_LOCK_DSHARE(vp);
    VOP_UNLOCK(vp, 0);
    *vpp = vp;
    /*
     * Save the credential of the process that turned on quotas.
     * Set up the time limits for this quota.
//.........这里部分代码省略.........

static int
udf_mount(struct mount *mp)
{
	struct vnode *devvp;	/* vnode of the mount device */
	struct thread *td;
	struct udf_mnt *imp = NULL;
	struct vfsoptlist *opts;
	char *fspec, *cs_disk, *cs_local;
	int error, len, *udf_flags;
	struct nameidata nd, *ndp = &nd;

	td = curthread;
	opts = mp->mnt_optnew;

	/*
	 * Unconditionally mount as read-only.
	 */
	MNT_ILOCK(mp);
	mp->mnt_flag |= MNT_RDONLY;
	MNT_IUNLOCK(mp);

	/*
	 * No root filesystem support.  Probably not a big deal, since the
	 * bootloader doesn't understand UDF.
	 */
	if (mp->mnt_flag & MNT_ROOTFS)
		return (ENOTSUP);

	fspec = NULL;
	error = vfs_getopt(opts, "from", (void **)&fspec, &len);
	if (!error && fspec[len - 1] != '\0')
		return (EINVAL);

	if (mp->mnt_flag & MNT_UPDATE) {
		return (0);
	}

	/* Check that the mount device exists */
	if (fspec == NULL)
		return (EINVAL);
	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
	if ((error = namei(ndp)))
		return (error);
	NDFREE(ndp, NDF_ONLY_PNBUF);
	devvp = ndp->ni_vp;

	if (vn_isdisk(devvp, &error) == 0) {
		vput(devvp);
		return (error);
	}

	/* Check the access rights on the mount device */
	error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td);
	if (error)
		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
	if (error) {
		vput(devvp);
		return (error);
	}

	if ((error = udf_mountfs(devvp, mp))) {
		vrele(devvp);
		return (error);
	}

	imp = VFSTOUDFFS(mp);

	udf_flags = NULL;
	error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len);
	if (error || len != sizeof(int))
		return (EINVAL);
	imp->im_flags = *udf_flags;

	if (imp->im_flags & UDFMNT_KICONV && udf_iconv) {
		cs_disk = NULL;
		error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len);
		if (!error && cs_disk[len - 1] != '\0')
			return (EINVAL);
		cs_local = NULL;
		error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len);
		if (!error && cs_local[len - 1] != '\0')
			return (EINVAL);
		udf_iconv->open(cs_local, cs_disk, &imp->im_d2l);
#if 0
		udf_iconv->open(cs_disk, cs_local, &imp->im_l2d);
#endif
	}

	vfs_mountedfrom(mp, fspec);
	return 0;
};

/*ARGSUSED*/
int
coda_mount(struct mount *vfsp)
{
	struct vnode *dvp;
	struct cnode *cp;
	struct cdev *dev;
	struct coda_mntinfo *mi;
	struct vnode *rootvp;
	struct CodaFid rootfid = INVAL_FID;
	struct CodaFid ctlfid = CTL_FID;
	int error;
	struct nameidata ndp;
	ENTRY;
	char *from;

	if (vfs_filteropt(vfsp->mnt_optnew, coda_opts))
		return (EINVAL);
	from = vfs_getopts(vfsp->mnt_optnew, "from", &error);
	if (error)
		return (error);
	coda_vfsopstats_init();
	coda_vnodeopstats_init();
	MARK_ENTRY(CODA_MOUNT_STATS);
	if (CODA_MOUNTED(vfsp)) {
		MARK_INT_FAIL(CODA_MOUNT_STATS);
		return (EBUSY);
	}

	/*
	 * Validate mount device.  Similar to getmdev().
	 */
	NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, from, curthread);
	error = namei(&ndp);
	dvp = ndp.ni_vp;
	if (error) {
		MARK_INT_FAIL(CODA_MOUNT_STATS);
		return (error);
	}
	if (dvp->v_type != VCHR) {
		MARK_INT_FAIL(CODA_MOUNT_STATS);
		vrele(dvp);
		NDFREE(&ndp, NDF_ONLY_PNBUF);
		return (ENXIO);
	}
	dev = dvp->v_rdev;
	vrele(dvp);
	NDFREE(&ndp, NDF_ONLY_PNBUF);

	/*
	 * Initialize the mount record and link it to the vfs struct.
	 */
	mi = dev2coda_mntinfo(dev);
	if (!mi) {
		MARK_INT_FAIL(CODA_MOUNT_STATS);
		printf("Coda mount: %s is not a cfs device\n", from);
		return (ENXIO);
	}
	if (!VC_OPEN(&mi->mi_vcomm)) {
		MARK_INT_FAIL(CODA_MOUNT_STATS);
		return (ENODEV);
	}

	/*
	 * No initialization (here) of mi_vcomm!
	 */
	vfsp->mnt_data = mi;
	vfs_getnewfsid (vfsp);
	mi->mi_vfsp = vfsp;
	mi->mi_started = 0;			/* XXX See coda_root() */

	/*
	 * Make a root vnode to placate the Vnode interface, but don't
	 * actually make the CODA_ROOT call to venus until the first call to
	 * coda_root in case a server is down while venus is starting.
	 */
	cp = make_coda_node(&rootfid, vfsp, VDIR);
	rootvp = CTOV(cp);
	rootvp->v_vflag |= VV_ROOT;
	cp = make_coda_node(&ctlfid, vfsp, VREG);
	coda_ctlvp = CTOV(cp);

	/*
	 * Add vfs and rootvp to chain of vfs hanging off mntinfo.
	 */
	mi->mi_vfsp = vfsp;
	mi->mi_rootvp = rootvp;
	vfs_mountedfrom(vfsp, from);

	/*
	 * Error is currently guaranteed to be zero, but in case some code
	 * changes...
	 */
	CODADEBUG(1, myprintf(("coda_mount returned %d\n", error)););