Date: Mon, 21 Mar 2016 00:19:42 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r297113 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201603210019.u2L0JggO035389@repo.freebsd.org>
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Author: mav Date: Mon Mar 21 00:19:42 2016 New Revision: 297113 URL: https://svnweb.freebsd.org/changeset/base/297113 Log: MFC r296521: MFV r296520: 6562 Refquota on receive doesn't account for overage Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com> Reviewed by: Toomas Soome <tsoome@me.com> Approved by: Gordon Ross <gwr@nexenta.com> Author: Dan McDonald <danmcd@omniti.com> illumos/illumos-gate@5f7a8e6d750cb070a3347f045201c6206caee6aa Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Mon Mar 21 00:18:38 2016 (r297112) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Mon Mar 21 00:19:42 2016 (r297113) @@ -26,6 +26,7 @@ * Copyright (c) 2014 RackTop Systems. * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. * Copyright (c) 2014 Integros [integros.com] + * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. */ #include <sys/dmu_objset.h> @@ -85,6 +86,8 @@ SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recor extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); +extern int spa_asize_inflation; + /* * Figure out how much of this delta should be propogated to the dsl_dir * layer. If there's a refreservation, that space has already been @@ -2897,6 +2900,11 @@ int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) { + /* + * "slack" factor for received datasets with refquota set on them. + * See the bottom of this function for details on its use. + */ + uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; int64_t unused_refres_delta; /* they should both be heads */ @@ -2939,10 +2947,22 @@ dsl_dataset_clone_swap_check_impl(dsl_da dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) return (SET_ERROR(ENOSPC)); - /* clone can't be over the head's refquota */ + /* + * The clone can't be too much over the head's refquota. + * + * To ensure that the entire refquota can be used, we allow one + * transaction to exceed the the refquota. Therefore, this check + * needs to also allow for the space referenced to be more than the + * refquota. The maximum amount of space that one transaction can use + * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this + * overage ensures that we are able to receive a filesystem that + * exceeds the refquota on the source system. + * + * So that overage is the refquota_slack we use below. + */ if (origin_head->ds_quota != 0 && dsl_dataset_phys(clone)->ds_referenced_bytes > - origin_head->ds_quota) + origin_head->ds_quota + refquota_slack) return (SET_ERROR(EDQUOT)); return (0); @@ -2956,8 +2976,13 @@ dsl_dataset_clone_swap_sync_impl(dsl_dat int64_t unused_refres_delta; ASSERT(clone->ds_reserved == 0); + /* + * NOTE: On DEBUG kernels there could be a race between this and + * the check function if spa_asize_inflation is adjusted... + */ ASSERT(origin_head->ds_quota == 0 || - dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); + dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + + DMU_MAX_ACCESS * spa_asize_inflation); ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); /*
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