Author: mav Date: Thu Mar 22 23:49:54 2018 New Revision: 331390 URL: https://svnweb.freebsd.org/changeset/base/331390
Log: MFC r329663: MFV r316876: 7542 zfs_unmount failed with EZFS_UNSHARENFSFAILED illumos/illumos-gate@09c9e6dc9b69d10b771bb87e01040ec320a0bfd3 https://github.com/illumos/illumos-gate/commit/09c9e6dc9b69d10b771bb87e01040ec320a0bfd3 https://www.illumos.org/issues/7542 libshare keeps a cached copy of the sharetab listing in memory, which can become out of date if shares are destroyed or created while leaving a libzfs handle open.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 <mahr...@delphix.com> Reviewed by: Dan Kimmel <dan.kim...@delphix.com> Reviewed by: Matt Amdur <matt.am...@delphix.com> Approved by: Robert Mustacchi <r...@joyent.com> Author: Chris Williamson <chris.william...@delphix.com> Modified: stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Directory Properties: stable/11/ (props changed) Modified: stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h ============================================================================== --- stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h Thu Mar 22 23:48:07 2018 (r331389) +++ stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h Thu Mar 22 23:49:54 2018 (r331390) @@ -22,7 +22,7 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2011 Pawel Jakub Dawidek. All rights reserved. - * Copyright (c) 2011, 2015 by Delphix. All rights reserved. + * Copyright (c) 2011, 2016 by Delphix. All rights reserved. * Copyright (c) 2013 Martin Matuska <m...@freebsd.org>. All rights reserved. */ @@ -72,7 +72,6 @@ struct libzfs_handle { int libzfs_printerr; int libzfs_storeerr; /* stuff error messages into buffer */ void *libzfs_sharehdl; /* libshare handle */ - uint_t libzfs_shareflags; boolean_t libzfs_mnttab_enable; avl_tree_t libzfs_mnttab_cache; int libzfs_pool_iter; @@ -81,8 +80,6 @@ struct libzfs_handle { char libzfs_chassis_id[256]; boolean_t libzfs_prop_debug; }; - -#define ZFSSHARE_MISS 0x01 /* Didn't find entry in cache */ struct zfs_handle { libzfs_handle_t *zfs_hdl; Modified: stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c ============================================================================== --- stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Thu Mar 22 23:48:07 2018 (r331389) +++ stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Thu Mar 22 23:49:54 2018 (r331390) @@ -22,7 +22,7 @@ /* * Copyright 2015 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2014, 2015 by Delphix. All rights reserved. + * Copyright (c) 2014, 2016 by Delphix. All rights reserved. * Copyright 2016 Igor Kozhukhov <ikozhuk...@gmail.com> * Copyright 2017 Joyent, Inc. * Copyright 2017 RackTop Systems. @@ -672,8 +672,6 @@ _zfs_init_libshare(void) int zfs_init_libshare(libzfs_handle_t *zhandle, int service) { - int ret = SA_OK; - #ifdef illumos /* * libshare is either not installed or we're in a branded zone. The @@ -684,31 +682,28 @@ zfs_init_libshare(libzfs_handle_t *zhandle, int servic if (_sa_init == NULL) return (SA_OK); - if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) { - /* - * We had a cache miss. Most likely it is a new ZFS - * dataset that was just created. We want to make sure - * so check timestamps to see if a different process - * has updated any of the configuration. If there was - * some non-ZFS change, we need to re-initialize the - * internal cache. - */ - zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS; - if (_sa_needs_refresh != NULL && - _sa_needs_refresh(zhandle->libzfs_sharehdl)) { - zfs_uninit_libshare(zhandle); - zhandle->libzfs_sharehdl = _sa_init(service); - } + /* + * Attempt to refresh libshare. This is necessary if there was a cache + * miss for a new ZFS dataset that was just created, or if state of the + * sharetab file has changed since libshare was last initialized. We + * want to make sure so check timestamps to see if a different process + * has updated any of the configuration. If there was some non-ZFS + * change, we need to re-initialize the internal cache. + */ + if (_sa_needs_refresh != NULL && + _sa_needs_refresh(zhandle->libzfs_sharehdl)) { + zfs_uninit_libshare(zhandle); + zhandle->libzfs_sharehdl = _sa_init(service); } - if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL) + if (zhandle && zhandle->libzfs_sharehdl == NULL) zhandle->libzfs_sharehdl = _sa_init(service); - if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL) - ret = SA_NO_MEMORY; + if (zhandle->libzfs_sharehdl == NULL) + return (SA_NO_MEMORY); #endif - return (ret); + return (SA_OK); } /* @@ -864,7 +859,6 @@ zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t * zfs_get_name(zhp)); return (-1); } - hdl->libzfs_shareflags |= ZFSSHARE_MISS; share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint); } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
