0c66c32d1d
5056 ZFS deadlock on db_mtx and dn_holds Author: Justin Gibbs <justing@spectralogic.com> Reviewed by: Will Andrews <willa@spectralogic.com> Reviewed by: Matt Ahrens <mahrens@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Approved by: Dan McDonald <danmcd@omniti.com> References: https://www.illumos.org/issues/5056 https://github.com/illumos/illumos-gate/commit/bc9014e Porting Notes: sa_handle_get_from_db(): - the original patch includes an otherwise unmentioned fix for a possible usage of an uninitialised variable dmu_objset_open_impl(): - Under Illumos list_link_init() is the same as filling a list_node_t with NULLs, so they don't notice if they miss doing list_link_init() on a zero'd containing structure (e.g. allocated with kmem_zalloc as here). Under Linux, not so much: an uninitialised list_node_t goes "Boom!" some time later when it's used or destroyed. dmu_objset_evict_dbufs(): - reduce stack usage using kmem_alloc() Ported-by: Chris Dunlop <chris@onthe.net.au> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
171 lines
5.1 KiB
C
171 lines
5.1 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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#ifndef _SYS_SA_H
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#define _SYS_SA_H
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#include <sys/dmu.h>
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/*
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* Currently available byteswap functions.
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* If it all possible new attributes should used
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* one of the already defined byteswap functions.
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* If a new byteswap function is added then the
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* ZPL/Pool version will need to be bumped.
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*/
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typedef enum sa_bswap_type {
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SA_UINT64_ARRAY,
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SA_UINT32_ARRAY,
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SA_UINT16_ARRAY,
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SA_UINT8_ARRAY,
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SA_ACL,
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} sa_bswap_type_t;
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typedef uint16_t sa_attr_type_t;
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/*
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* Attribute to register support for.
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*/
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typedef struct sa_attr_reg {
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char *sa_name; /* attribute name */
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uint16_t sa_length;
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sa_bswap_type_t sa_byteswap; /* bswap functon enum */
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sa_attr_type_t sa_attr; /* filled in during registration */
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} sa_attr_reg_t;
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typedef void (sa_data_locator_t)(void **, uint32_t *, uint32_t,
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boolean_t, void *userptr);
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/*
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* array of attributes to store.
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*
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* This array should be treated as opaque/private data.
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* The SA_BULK_ADD_ATTR() macro should be used for manipulating
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* the array.
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*
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* When sa_replace_all_by_template() is used the attributes
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* will be stored in the order defined in the array, except that
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* the attributes may be split between the bonus and the spill buffer
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*
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*/
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typedef struct sa_bulk_attr {
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void *sa_data;
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sa_data_locator_t *sa_data_func;
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uint16_t sa_length;
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sa_attr_type_t sa_attr;
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/* the following are private to the sa framework */
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void *sa_addr;
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uint16_t sa_buftype;
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uint16_t sa_size;
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} sa_bulk_attr_t;
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/*
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* special macro for adding entries for bulk attr support
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* bulk - sa_bulk_attr_t
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* count - integer that will be incremented during each add
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* attr - attribute to manipulate
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* func - function for accessing data.
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* data - pointer to data.
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* len - length of data
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*/
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#define SA_ADD_BULK_ATTR(b, idx, attr, func, data, len) \
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{ \
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b[idx].sa_attr = attr;\
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b[idx].sa_data_func = func; \
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b[idx].sa_data = data; \
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b[idx++].sa_length = len; \
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}
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typedef struct sa_os sa_os_t;
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typedef enum sa_handle_type {
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SA_HDL_SHARED,
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SA_HDL_PRIVATE
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} sa_handle_type_t;
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struct sa_handle;
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typedef void *sa_lookup_tab_t;
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typedef struct sa_handle sa_handle_t;
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typedef void (sa_update_cb_t)(sa_handle_t *, dmu_tx_t *tx);
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int sa_handle_get(objset_t *, uint64_t, void *userp,
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sa_handle_type_t, sa_handle_t **);
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int sa_handle_get_from_db(objset_t *, dmu_buf_t *, void *userp,
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sa_handle_type_t, sa_handle_t **);
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void sa_handle_destroy(sa_handle_t *);
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int sa_buf_hold(objset_t *, uint64_t, void *, dmu_buf_t **);
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void sa_buf_rele(dmu_buf_t *, void *);
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int sa_lookup(sa_handle_t *, sa_attr_type_t, void *buf, uint32_t buflen);
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int sa_update(sa_handle_t *, sa_attr_type_t, void *buf,
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uint32_t buflen, dmu_tx_t *);
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int sa_remove(sa_handle_t *, sa_attr_type_t, dmu_tx_t *);
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int sa_bulk_lookup(sa_handle_t *, sa_bulk_attr_t *, int count);
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int sa_bulk_lookup_locked(sa_handle_t *, sa_bulk_attr_t *, int count);
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int sa_bulk_update(sa_handle_t *, sa_bulk_attr_t *, int count, dmu_tx_t *);
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int sa_size(sa_handle_t *, sa_attr_type_t, int *);
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int sa_update_from_cb(sa_handle_t *, sa_attr_type_t,
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uint32_t buflen, sa_data_locator_t *, void *userdata, dmu_tx_t *);
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void sa_object_info(sa_handle_t *, dmu_object_info_t *);
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void sa_object_size(sa_handle_t *, uint32_t *, u_longlong_t *);
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void *sa_get_userdata(sa_handle_t *);
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void sa_set_userp(sa_handle_t *, void *);
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dmu_buf_t *sa_get_db(sa_handle_t *);
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uint64_t sa_handle_object(sa_handle_t *);
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boolean_t sa_attr_would_spill(sa_handle_t *, sa_attr_type_t, int size);
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void sa_spill_rele(sa_handle_t *);
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void sa_register_update_callback(objset_t *, sa_update_cb_t *);
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int sa_setup(objset_t *, uint64_t, sa_attr_reg_t *, int, sa_attr_type_t **);
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void sa_tear_down(objset_t *);
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int sa_replace_all_by_template(sa_handle_t *, sa_bulk_attr_t *,
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int, dmu_tx_t *);
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int sa_replace_all_by_template_locked(sa_handle_t *, sa_bulk_attr_t *,
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int, dmu_tx_t *);
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boolean_t sa_enabled(objset_t *);
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void sa_cache_init(void);
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void sa_cache_fini(void);
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int sa_set_sa_object(objset_t *, uint64_t);
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int sa_hdrsize(void *);
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void sa_handle_lock(sa_handle_t *);
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void sa_handle_unlock(sa_handle_t *);
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#ifdef _KERNEL
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int sa_lookup_uio(sa_handle_t *, sa_attr_type_t, uio_t *);
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SA_H */
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