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4ed5e25074
This allows ZFS datasets to be delegated to a user/mount namespace Within that namespace, only the delegated datasets are visible Works very similarly to Zones/Jailes on other ZFS OSes As a user: ``` $ unshare -Um $ zfs list no datasets available $ echo $$ 1234 ``` As root: ``` # zfs list NAME ZONED MOUNTPOINT containers off /containers containers/host off /containers/host containers/host/child off /containers/host/child containers/host/child/gchild off /containers/host/child/gchild containers/unpriv on /unpriv containers/unpriv/child on /unpriv/child containers/unpriv/child/gchild on /unpriv/child/gchild # zfs zone /proc/1234/ns/user containers/unpriv ``` Back to the user namespace: ``` $ zfs list NAME USED AVAIL REFER MOUNTPOINT containers 129M 47.8G 24K /containers containers/unpriv 128M 47.8G 24K /unpriv containers/unpriv/child 128M 47.8G 128M /unpriv/child ``` Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Will Andrews <will.andrews@klarasystems.com> Signed-off-by: Allan Jude <allan@klarasystems.com> Signed-off-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com> Co-authored-by: Allan Jude <allan@klarasystems.com> Co-authored-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com> Sponsored-by: Buddy <https://buddy.works> Closes #12263
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Ricardo Correia. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include <zone.h>
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zoneid_t
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getzoneid(void)
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{
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char path[PATH_MAX];
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char buf[128] = { '\0' };
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char *cp;
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int c = snprintf(path, sizeof (path), "/proc/self/ns/user");
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/* This API doesn't have any error checking... */
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if (c < 0)
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return (0);
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ssize_t r = readlink(path, buf, sizeof (buf) - 1);
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if (r < 0)
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return (0);
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cp = strchr(buf, '[');
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if (cp == NULL)
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return (0);
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cp++;
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unsigned long n = strtoul(cp, NULL, 10);
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if (n == ULONG_MAX && errno == ERANGE)
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return (0);
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zoneid_t z = (zoneid_t)n;
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return (z);
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}
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