C++ VOP_CLOSE函数代码示例

/*
 * Unmount the filesystem described by mp.
 */
int
msdosfs_unmount(struct mount *mp, int mntflags)
{
	struct msdosfsmount *pmp;
	int error, flags;

	flags = 0;
	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
	if ((error = vflush(mp, NULLVP, flags)) != 0)
		return (error);
	pmp = VFSTOMSDOSFS(mp);
	if (pmp->pm_devvp->v_type != VBAD)
		spec_node_setmountedfs(pmp->pm_devvp, NULL);
#ifdef MSDOSFS_DEBUG
	{
		struct vnode *vp = pmp->pm_devvp;

		printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
		printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n",
		    vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount,
		    vp->v_writecount, vp->v_holdcnt);
		printf("mount %p, op %p\n",
		    vp->v_mount, vp->v_op);
		printf("freef %p, freeb %p, mount %p\n",
		    vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
		    vp->v_mount);
		printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
		    vp->v_cleanblkhd.lh_first,
		    vp->v_dirtyblkhd.lh_first,
		    vp->v_numoutput, vp->v_type);
		printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
		    vp->v_socket, vp->v_tag,
		    ((u_int *)vp->v_data)[0],
		    ((u_int *)vp->v_data)[1]);
	}
#endif
	vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
	(void) VOP_CLOSE(pmp->pm_devvp,
	    pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED);
	vput(pmp->pm_devvp);
	msdosfs_fh_destroy(pmp);
	free(pmp->pm_inusemap, M_MSDOSFSFAT);
	free(pmp, M_MSDOSFSMNT);
	mp->mnt_data = NULL;
	mp->mnt_flag &= ~MNT_LOCAL;
	fstrans_unmount(mp);
	return (0);
}

static void
spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
{
	size_t buflen;
	char *buf;
	vnode_t *vp;
	int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX;
	char *temp;

	/*
	 * If the nvlist is empty (NULL), then remove the old cachefile.
	 */
	if (nvl == NULL) {
		(void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
		return;
	}

	/*
	 * Pack the configuration into a buffer.
	 */
	VERIFY(nvlist_size(nvl, &buflen, NV_ENCODE_XDR) == 0);

	buf = kmem_alloc(buflen, KM_SLEEP);
	temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP);

	VERIFY(nvlist_pack(nvl, &buf, &buflen, NV_ENCODE_XDR,
	    KM_SLEEP) == 0);

	/*
	 * Write the configuration to disk.  We need to do the traditional
	 * 'write to temporary file, sync, move over original' to make sure we
	 * always have a consistent view of the data.
	 */
	(void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);

	if (vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0) == 0) {
		if (vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
		    0, RLIM64_INFINITY, kcred, NULL) == 0 &&
		    VOP_FSYNC(vp, FSYNC, kcred, NULL) == 0) {
			(void) vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
		}
		(void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
	}

	(void) vn_remove(temp, UIO_SYSSPACE, RMFILE);

	kmem_free(buf, buflen);
	kmem_free(temp, MAXPATHLEN);
}

static void
vdev_file_close(vdev_t *vd)
{
	vdev_file_t *vf = vd->vdev_tsd;

	if (vf == NULL)
		return;

	if (vf->vf_vnode != NULL) {
		(void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
		(void) VOP_CLOSE(vf->vf_vnode, spa_mode, 1, 0, kcred, NULL);
		VN_RELE(vf->vf_vnode);
	}

	kmem_free(vf, sizeof (vdev_file_t));
	vd->vdev_tsd = NULL;
}

/*
 * If the cpr default file is invalid, then we must not be in reusable mode
 * if it is valid, it tells us our mode
 */
int
cpr_get_reusable_mode(void)
{
	struct vnode *vp;
	cmini_t mini;
	int rc;

	if (cpr_open(cpr_default_path, FREAD, &vp))
		return (0);

	rc = cpr_rdwr(UIO_READ, vp, &mini, sizeof (mini));
	(void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED(), NULL);
	VN_RELE(vp);
	if (rc == 0 && mini.magic == CPR_DEFAULT_MAGIC)
		return (mini.reusable);

	return (0);
}

/*
 * Helper function for findroot():
 * Return non-zero if disk device matches bootinfo.
 */
static int
match_bootdisk(device_t dv, struct btinfo_bootdisk *bid)
{
	struct vnode *tmpvn;
	int error;
	struct disklabel label;
	int found = 0;

	if (device_is_a(dv, "dk"))
		return 0;

	/*
	 * A disklabel is required here.  The boot loader doesn't refuse
	 * to boot from a disk without a label, but this is normally not
	 * wanted.
	 */
	if (bid->labelsector == -1)
		return (0);
	
	if ((tmpvn = opendisk(dv)) == NULL)
		return 0;

	error = VOP_IOCTL(tmpvn, DIOCGDINFO, &label, FREAD, NOCRED);
	if (error) {
		/*
		 * XXX Can't happen -- open() would have errored out
		 * or faked one up.
		 */
		printf("findroot: can't get label for dev %s (%d)\n",
		    device_xname(dv), error);
		goto closeout;
	}

	/* Compare with our data. */
	if (label.d_type == bid->label.type &&
	    label.d_checksum == bid->label.checksum &&
	    strncmp(label.d_packname, bid->label.packname, 16) == 0)
		found = 1;

 closeout:
	VOP_CLOSE(tmpvn, FREAD, NOCRED);
	vput(tmpvn);
	return (found);
}

/*
 * Helper function for findroot():
 * Return non-zero if wedge device matches bootinfo.
 */
static int
match_bootwedge(device_t dv, struct btinfo_bootwedge *biw)
{
	MD5_CTX ctx;
	struct vnode *tmpvn;
	int error;
	uint8_t bf[DEV_BSIZE];
	uint8_t hash[16];
	int found = 0;
	daddr_t blk;
	uint64_t nblks;

	/*
	 * If the boot loader didn't specify the sector, abort.
	 */
	if (biw->matchblk == -1)
		return (0);

	if ((tmpvn = opendisk(dv)) == NULL)
		return 0;

	MD5Init(&ctx);
	for (blk = biw->matchblk, nblks = biw->matchnblks;
	     nblks != 0; nblks--, blk++) {
		error = vn_rdwr(UIO_READ, tmpvn, (void *) bf,
		    sizeof(bf), blk * DEV_BSIZE, UIO_SYSSPACE,
		    0, NOCRED, NULL, NULL);
		if (error) {
			printf("findroot: unable to read block %" PRId64 " "
			    "of dev %s (%d)\n", blk, device_xname(dv), error);
			goto closeout;
		}
		MD5Update(&ctx, bf, sizeof(bf));
	}
	MD5Final(hash, &ctx);

	/* Compare with the provided hash. */
	found = memcmp(biw->matchhash, hash, sizeof(hash)) == 0;

 closeout:
	VOP_CLOSE(tmpvn, FREAD, NOCRED);
	vput(tmpvn);
	return (found);
}

static int
splat_vnode_test6(struct file *file, void *arg)
{
	vnode_t *vp;
	char buf[32] = "SPL VNode Interface Test File\n";
	int rc;

	if ((rc = splat_vnode_unlink_all(file, arg, SPLAT_VNODE_TEST6_NAME)))
		return rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE,
			  FWRITE | FCREAT | FEXCL, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		return -rc;
	}

        rc = vn_rdwr(UIO_WRITE, vp, buf, strlen(buf), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed vn_rdwr write of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	rc = vn_fsync(vp, 0, 0, 0);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed vn_fsync of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	rc = 0;
	splat_vprint(file, SPLAT_VNODE_TEST6_NAME, "Successfully "
		     "fsync'ed test file %s\n", SPLAT_VNODE_TEST_FILE_RW);
out:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
	vn_remove(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE, RMFILE);

        return -rc;
} /* splat_vnode_test6() */

int
udf_unmount(struct mount *mp, int mntflags, struct proc *p)
{
	struct umount *ump;
	struct vnode *devvp;
	int error, flags = 0;

	ump = VFSTOUDFFS(mp);
	devvp = ump->um_devvp;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;

	if ((error = vflush(mp, NULL, flags)))
		return (error);

	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
	vinvalbuf(devvp, V_SAVE, NOCRED, p, 0, 0);
	error = VOP_CLOSE(devvp, FREAD, NOCRED, p);
	VOP_UNLOCK(devvp, 0, p);
	if (error)
		return (error);

	devvp->v_specmountpoint = NULL;
	vrele(devvp);

	if (ump->um_flags & UDF_MNT_USES_VAT)
		free(ump->um_vat, M_UDFMOUNT);

	if (ump->um_stbl != NULL)
		free(ump->um_stbl, M_UDFMOUNT);

	if (ump->um_hashtbl != NULL)
		free(ump->um_hashtbl, M_UDFMOUNT);

	free(ump, M_UDFMOUNT);

	mp->mnt_data = (qaddr_t)0;
	mp->mnt_flag &= ~MNT_LOCAL;

	return (0);
}

int
cnclose(dev_t dev, int flag, int mode, struct lwp *l)
{
	struct vnode *vp;
	int unit, error;

	unit = minor(dev);

	if (cn_tab == NULL)
		return (0);

	vp = cn_devvp[unit];
	cn_devvp[unit] = NULL;
	error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
	if (error == 0) {
		error = VOP_CLOSE(vp, flag, kauth_cred_get());
		VOP_UNLOCK(vp);
	}
	return error;
}

static void
vdev_file_close(vdev_t *vd)
{
	vdev_file_t *vf = vd->vdev_tsd;

	if (vd->vdev_reopening || vf == NULL)
		return;

	if (vf->vf_vnode != NULL) {
        vnode_getwithvid(vf->vf_vnode, vf->vf_vid);
        // Also commented out in MacZFS
		//(void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
		(void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
		    kcred, NULL);
	}

	vd->vdev_delayed_close = B_FALSE;
	kmem_free(vf, sizeof (vdev_file_t));
	vd->vdev_tsd = NULL;
}

/* ARGSUSED */
static int
xattr_dir_close(vnode_t *vp, int flags, int count, offset_t off, cred_t *cr,
    caller_context_t *ct)
{
	vnode_t *realvp;
	int error;

	/*
	 * If there is a real extended attribute directory,
	 * let the underlying FS see the VOP_CLOSE call;
	 * otherwise just return zero.
	 */
	error = xattr_dir_realdir(vp, &realvp, LOOKUP_XATTR, cr, ct);
	if (error == 0) {
		error = VOP_CLOSE(realvp, flags, count, off, cr, ct);
	} else {
		error = 0;
	}

	return (error);
}

static int
splat_vnode_test5(struct file *file, void *arg)
{
	vnode_t *vp;
	vattr_t vap;
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE, UIO_SYSSPACE,
			  FREAD, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return -rc;
	}

	rc = VOP_GETATTR(vp, &vap, 0, 0, NULL);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed to vn_getattr test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		goto out;
	}

	if (vap.va_type != VREG) {
		rc = EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed expected regular file type "
			     "(%d != VREG): %s (%d)\n", vap.va_type,
			     SPLAT_VNODE_TEST_FILE, rc);
		goto out;
	}

	splat_vprint(file, SPLAT_VNODE_TEST1_NAME, "Successfully "
		     "vn_getattr'ed test file: %s\n", SPLAT_VNODE_TEST_FILE);

out:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);

        return -rc;
} /* splat_vnode_test5() */

/*
 * write cdef_t to disk.  This contains the original values of prom
 * properties that we modify.  We fill in the magic number of the file
 * here as a signal to the booter code that the state file is valid.
 * Be sure the file gets synced, since we may be shutting down the OS.
 */
int
cpr_write_deffile(cdef_t *cdef)
{
	struct vnode *vp;
	char *str;
	int rc;

	if (rc = cpr_open_deffile(FCREAT|FWRITE, &vp))
		return (rc);

	if (rc = cpr_rdwr(UIO_WRITE, vp, cdef, sizeof (*cdef)))
		str = "write";
	else if (rc = VOP_FSYNC(vp, FSYNC, CRED(), NULL))
		str = "fsync";
	(void) VOP_CLOSE(vp, FWRITE, 1, (offset_t)0, CRED(), NULL);
	VN_RELE(vp);

	if (rc) {
		cpr_err(CE_WARN, "%s error %d, file \"%s\"",
		    str, rc, cpr_default_path);
	}
	return (rc);
}

int
i_cpr_check_cprinfo(void)
{
	struct vnode *vp;
	cmini_t mini;
	int rc = 0;

	if (rc = cpr_open_deffile(FREAD, &vp)) {
		if (rc == ENOENT)
			cpr_err(CE_NOTE, "cprinfo file does not "
			    "exist.  You must run 'uadmin %d %d' "
			    "command while / is mounted writeable,\n"
			    "then reboot and run 'uadmin %d %d' "
			    "to create a reusable statefile",
			    A_FREEZE, AD_REUSEINIT, A_FREEZE, AD_REUSABLE);
		return (rc);
	}

	rc = cpr_rdwr(UIO_READ, vp, &mini, sizeof (mini));
	(void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED(), NULL);
	VN_RELE(vp);

	if (rc) {
		cpr_err(CE_WARN, "Failed reading %s, errno = %d",
		    cpr_default_path, rc);
	} else if (mini.magic != CPR_DEFAULT_MAGIC) {
		cpr_err(CE_CONT, "bad magic number in cprinfo file.\n"
		    "You must run 'uadmin %d %d' while / is mounted "
		    "writeable, then reboot and run 'uadmin %d %d' "
		    "to create a reusable statefile\n",
		    A_FREEZE, AD_REUSEINIT, A_FREEZE, AD_REUSABLE);
		rc = EINVAL;
	}

	return (rc);
}

/*
 * Decrement the open count.
 * Called by VOP_DECOPEN.
 */
void
vnode_decopen(struct vnode *vn)
{
	int opencount, result;

	assert(vn!=NULL);
	lock_acquire(vn->vn_countlock);
	assert(vn->vn_opencount>0);
	vn->vn_opencount--;
	opencount = vn->vn_opencount;
	lock_release(vn->vn_countlock);

	if (opencount > 0) {
		return;
	}

	result = VOP_CLOSE(vn);
	if (result) {
		// XXX: also lame.
		// The FS should do what it can to make sure this code
		// doesn't get reached...
		kprintf("vfs: Warning: VOP_CLOSE: %s\n", strerror(result));
	}
}