diff options
Diffstat (limited to 'module/zfs/vdev_root.c')
| -rw-r--r-- | module/zfs/vdev_root.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/module/zfs/vdev_root.c b/module/zfs/vdev_root.c new file mode 100644 index 000000000000..9e8aac7d03de --- /dev/null +++ b/module/zfs/vdev_root.c @@ -0,0 +1,158 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2010 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* + * Copyright (c) 2012, 2016 by Delphix. All rights reserved. + */ + +#include <sys/zfs_context.h> +#include <sys/spa.h> +#include <sys/vdev_impl.h> +#include <sys/zio.h> +#include <sys/fs/zfs.h> + +/* + * Virtual device vector for the pool's root vdev. + */ + +static uint64_t +vdev_root_core_tvds(vdev_t *vd) +{ + uint64_t tvds = 0; + + for (uint64_t c = 0; c < vd->vdev_children; c++) { + vdev_t *cvd = vd->vdev_child[c]; + + if (!cvd->vdev_ishole && !cvd->vdev_islog && + cvd->vdev_ops != &vdev_indirect_ops) { + tvds++; + } + } + + return (tvds); +} + +/* + * We should be able to tolerate one failure with absolutely no damage + * to our metadata. Two failures will take out space maps, a bunch of + * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy + * place to live. When we get smarter, we can liberalize this policy. + * e.g. If we haven't lost two consecutive top-level vdevs, then we are + * probably fine. Adding bean counters during alloc/free can make this + * future guesswork more accurate. + */ +static boolean_t +too_many_errors(vdev_t *vd, uint64_t numerrors) +{ + uint64_t tvds; + + if (numerrors == 0) + return (B_FALSE); + + tvds = vdev_root_core_tvds(vd); + ASSERT3U(numerrors, <=, tvds); + + if (numerrors == tvds) + return (B_TRUE); + + return (numerrors > spa_missing_tvds_allowed(vd->vdev_spa)); +} + +static int +vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize, + uint64_t *ashift, uint64_t *pshift) +{ + spa_t *spa = vd->vdev_spa; + int lasterror = 0; + int numerrors = 0; + + if (vd->vdev_children == 0) { + vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + return (SET_ERROR(EINVAL)); + } + + vdev_open_children(vd); + + for (int c = 0; c < vd->vdev_children; c++) { + vdev_t *cvd = vd->vdev_child[c]; + + if (cvd->vdev_open_error && !cvd->vdev_islog && + cvd->vdev_ops != &vdev_indirect_ops) { + lasterror = cvd->vdev_open_error; + numerrors++; + } + } + + if (spa_load_state(spa) != SPA_LOAD_NONE) + spa_set_missing_tvds(spa, numerrors); + + if (too_many_errors(vd, numerrors)) { + vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; + return (lasterror); + } + + *asize = 0; + *max_asize = 0; + *ashift = 0; + *pshift = 0; + + return (0); +} + +static void +vdev_root_close(vdev_t *vd) +{ + for (int c = 0; c < vd->vdev_children; c++) + vdev_close(vd->vdev_child[c]); +} + +static void +vdev_root_state_change(vdev_t *vd, int faulted, int degraded) +{ + if (too_many_errors(vd, faulted)) { + vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, + VDEV_AUX_NO_REPLICAS); + } else if (degraded || faulted) { + vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); + } else { + vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); + } +} + +vdev_ops_t vdev_root_ops = { + .vdev_op_open = vdev_root_open, + .vdev_op_close = vdev_root_close, + .vdev_op_asize = vdev_default_asize, + .vdev_op_io_start = NULL, /* not applicable to the root */ + .vdev_op_io_done = NULL, /* not applicable to the root */ + .vdev_op_state_change = vdev_root_state_change, + .vdev_op_need_resilver = NULL, + .vdev_op_hold = NULL, + .vdev_op_rele = NULL, + .vdev_op_remap = NULL, + .vdev_op_xlate = NULL, + .vdev_op_type = VDEV_TYPE_ROOT, /* name of this vdev type */ + .vdev_op_leaf = B_FALSE /* not a leaf vdev */ +}; |