MFV r316876: 7542 zfs_unmount failed with EZFS_UNSHARENFSFAILED
illumos/illumos-gate@09c9e6dc9b
09c9e6dc9b
https://www.illumos.org/issues/7542
libshare keeps a cached copy of the sharetab listing in memory, which can
become out of date if shares are destroyed or created while leaving a libzfs
handle open. This results in a spurious unmounting failure when an NFS share
exists but isn't in the stale libshare cache.
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matt Amdur <matt.amdur@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Chris Williamson <chris.williamson@delphix.com>
This commit is contained in:
commit
806141acfc
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=329663
@ -22,7 +22,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011 Pawel Jakub Dawidek. All rights reserved.
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* Copyright (c) 2011, 2015 by Delphix. All rights reserved.
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* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
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* Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
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*/
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@ -72,7 +72,6 @@ struct libzfs_handle {
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int libzfs_printerr;
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int libzfs_storeerr; /* stuff error messages into buffer */
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void *libzfs_sharehdl; /* libshare handle */
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uint_t libzfs_shareflags;
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boolean_t libzfs_mnttab_enable;
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avl_tree_t libzfs_mnttab_cache;
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int libzfs_pool_iter;
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@ -82,8 +81,6 @@ struct libzfs_handle {
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boolean_t libzfs_prop_debug;
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};
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#define ZFSSHARE_MISS 0x01 /* Didn't find entry in cache */
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struct zfs_handle {
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libzfs_handle_t *zfs_hdl;
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zpool_handle_t *zpool_hdl;
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@ -22,7 +22,7 @@
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/*
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* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2014, 2015 by Delphix. All rights reserved.
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* Copyright (c) 2014, 2016 by Delphix. All rights reserved.
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* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
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* Copyright 2017 Joyent, Inc.
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* Copyright 2017 RackTop Systems.
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@ -672,8 +672,6 @@ _zfs_init_libshare(void)
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int
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zfs_init_libshare(libzfs_handle_t *zhandle, int service)
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{
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int ret = SA_OK;
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#ifdef illumos
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/*
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* libshare is either not installed or we're in a branded zone. The
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@ -684,31 +682,28 @@ zfs_init_libshare(libzfs_handle_t *zhandle, int service)
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if (_sa_init == NULL)
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return (SA_OK);
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if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
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/*
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* We had a cache miss. Most likely it is a new ZFS
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* dataset that was just created. We want to make sure
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* so check timestamps to see if a different process
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* has updated any of the configuration. If there was
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* some non-ZFS change, we need to re-initialize the
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* internal cache.
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* Attempt to refresh libshare. This is necessary if there was a cache
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* miss for a new ZFS dataset that was just created, or if state of the
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* sharetab file has changed since libshare was last initialized. We
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* want to make sure so check timestamps to see if a different process
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* has updated any of the configuration. If there was some non-ZFS
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* change, we need to re-initialize the internal cache.
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*/
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zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
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if (_sa_needs_refresh != NULL &&
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_sa_needs_refresh(zhandle->libzfs_sharehdl)) {
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zfs_uninit_libshare(zhandle);
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zhandle->libzfs_sharehdl = _sa_init(service);
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}
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}
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if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
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if (zhandle && zhandle->libzfs_sharehdl == NULL)
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zhandle->libzfs_sharehdl = _sa_init(service);
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if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
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ret = SA_NO_MEMORY;
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if (zhandle->libzfs_sharehdl == NULL)
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return (SA_NO_MEMORY);
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#endif
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return (ret);
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return (SA_OK);
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}
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/*
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@ -864,7 +859,6 @@ zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
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zfs_get_name(zhp));
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return (-1);
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}
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hdl->libzfs_shareflags |= ZFSSHARE_MISS;
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share = zfs_sa_find_share(hdl->libzfs_sharehdl,
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mountpoint);
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}
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