zfs-builds-mm/zfs-0.8.2/include/sys/sa_impl.h

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2019-10-24 23:13:56 +02:00
/*
* 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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
*/
#ifndef _SYS_SA_IMPL_H
#define _SYS_SA_IMPL_H
#include <sys/dmu.h>
#include <sys/refcount.h>
#include <sys/list.h>
/*
* Array of known attributes and their
* various characteristics.
*/
typedef struct sa_attr_table {
sa_attr_type_t sa_attr;
uint8_t sa_registered;
uint16_t sa_length;
sa_bswap_type_t sa_byteswap;
char *sa_name;
} sa_attr_table_t;
/*
* Zap attribute format for attribute registration
*
* 64 56 48 40 32 24 16 8 0
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | unused | len | bswap | attr num |
* +-------+-------+-------+-------+-------+-------+-------+-------+
*
* Zap attribute format for layout information.
*
* layout information is stored as an array of attribute numbers
* The name of the attribute is the layout number (0, 1, 2, ...)
*
* 16 0
* +---- ---+
* | attr # |
* +--------+
* | attr # |
* +--- ----+
* ......
*
*/
#define ATTR_BSWAP(x) BF32_GET(x, 16, 8)
#define ATTR_LENGTH(x) BF32_GET(x, 24, 16)
#define ATTR_NUM(x) BF32_GET(x, 0, 16)
#define ATTR_ENCODE(x, attr, length, bswap) \
{ \
BF64_SET(x, 24, 16, length); \
BF64_SET(x, 16, 8, bswap); \
BF64_SET(x, 0, 16, attr); \
}
#define TOC_OFF(x) BF32_GET(x, 0, 23)
#define TOC_ATTR_PRESENT(x) BF32_GET(x, 31, 1)
#define TOC_LEN_IDX(x) BF32_GET(x, 24, 4)
#define TOC_ATTR_ENCODE(x, len_idx, offset) \
{ \
BF32_SET(x, 31, 1, 1); \
BF32_SET(x, 24, 7, len_idx); \
BF32_SET(x, 0, 24, offset); \
}
#define SA_LAYOUTS "LAYOUTS"
#define SA_REGISTRY "REGISTRY"
/*
* Each unique layout will have their own table
* sa_lot (layout_table)
*/
typedef struct sa_lot {
avl_node_t lot_num_node;
avl_node_t lot_hash_node;
uint64_t lot_num;
uint64_t lot_hash;
sa_attr_type_t *lot_attrs; /* array of attr #'s */
uint32_t lot_var_sizes; /* how many aren't fixed size */
uint32_t lot_attr_count; /* total attr count */
list_t lot_idx_tab; /* should be only a couple of entries */
int lot_instance; /* used with lot_hash to identify entry */
} sa_lot_t;
/* index table of offsets */
typedef struct sa_idx_tab {
list_node_t sa_next;
sa_lot_t *sa_layout;
uint16_t *sa_variable_lengths;
zfs_refcount_t sa_refcount;
uint32_t *sa_idx_tab; /* array of offsets */
} sa_idx_tab_t;
/*
* Since the offset/index information into the actual data
* will usually be identical we can share that information with
* all handles that have the exact same offsets.
*
* You would typically only have a large number of different table of
* contents if you had a several variable sized attributes.
*
* Two AVL trees are used to track the attribute layout numbers.
* one is keyed by number and will be consulted when a DMU_OT_SA
* object is first read. The second tree is keyed by the hash signature
* of the attributes and will be consulted when an attribute is added
* to determine if we already have an instance of that layout. Both
* of these tree's are interconnected. The only difference is that
* when an entry is found in the "hash" tree the list of attributes will
* need to be compared against the list of attributes you have in hand.
* The assumption is that typically attributes will just be updated and
* adding a completely new attribute is a very rare operation.
*/
struct sa_os {
kmutex_t sa_lock;
boolean_t sa_need_attr_registration;
boolean_t sa_force_spill;
uint64_t sa_master_obj;
uint64_t sa_reg_attr_obj;
uint64_t sa_layout_attr_obj;
int sa_num_attrs;
sa_attr_table_t *sa_attr_table; /* private attr table */
sa_update_cb_t *sa_update_cb;
avl_tree_t sa_layout_num_tree; /* keyed by layout number */
avl_tree_t sa_layout_hash_tree; /* keyed by layout hash value */
int sa_user_table_sz;
sa_attr_type_t *sa_user_table; /* user name->attr mapping table */
};
/*
* header for all bonus and spill buffers.
*
* The header has a fixed portion with a variable number
* of "lengths" depending on the number of variable sized
* attributes which are determined by the "layout number"
*/
#define SA_MAGIC 0x2F505A /* ZFS SA */
typedef struct sa_hdr_phys {
uint32_t sa_magic;
/*
* Encoded with hdrsize and layout number as follows:
* 16 10 0
* +--------+-------+
* | hdrsz |layout |
* +--------+-------+
*
* Bits 0-10 are the layout number
* Bits 11-16 are the size of the header.
* The hdrsize is the number * 8
*
* For example.
* hdrsz of 1 ==> 8 byte header
* 2 ==> 16 byte header
*
*/
uint16_t sa_layout_info;
uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */
/* ... Data follows the lengths. */
} sa_hdr_phys_t;
#define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
#define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0)
#define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
{ \
BF32_SET_SB(x, 10, 6, 3, 0, size); \
BF32_SET(x, 0, 10, num); \
}
typedef enum sa_buf_type {
SA_BONUS = 1,
SA_SPILL = 2
} sa_buf_type_t;
typedef enum sa_data_op {
SA_LOOKUP,
SA_UPDATE,
SA_ADD,
SA_REPLACE,
SA_REMOVE
} sa_data_op_t;
/*
* Opaque handle used for most sa functions
*
* This needs to be kept as small as possible.
*/
struct sa_handle {
dmu_buf_user_t sa_dbu;
kmutex_t sa_lock;
dmu_buf_t *sa_bonus;
dmu_buf_t *sa_spill;
objset_t *sa_os;
void *sa_userp;
sa_idx_tab_t *sa_bonus_tab; /* idx of bonus */
sa_idx_tab_t *sa_spill_tab; /* only present if spill activated */
};
#define SA_GET_DB(hdl, type) \
(dmu_buf_impl_t *)((type == SA_BONUS) ? hdl->sa_bonus : hdl->sa_spill)
#define SA_GET_HDR(hdl, type) \
((sa_hdr_phys_t *)((dmu_buf_impl_t *)(SA_GET_DB(hdl, \
type))->db.db_data))
#define SA_IDX_TAB_GET(hdl, type) \
(type == SA_BONUS ? hdl->sa_bonus_tab : hdl->sa_spill_tab)
#define IS_SA_BONUSTYPE(a) \
((a == DMU_OT_SA) ? B_TRUE : B_FALSE)
#define SA_BONUSTYPE_FROM_DB(db) \
(dmu_get_bonustype((dmu_buf_t *)db))
#define SA_BLKPTR_SPACE (DN_OLD_MAX_BONUSLEN - sizeof (blkptr_t))
#define SA_LAYOUT_NUM(x, type) \
((!IS_SA_BONUSTYPE(type) ? 0 : (((IS_SA_BONUSTYPE(type)) && \
((SA_HDR_LAYOUT_NUM(x)) == 0)) ? 1 : SA_HDR_LAYOUT_NUM(x))))
#define SA_REGISTERED_LEN(sa, attr) sa->sa_attr_table[attr].sa_length
#define SA_ATTR_LEN(sa, idx, attr, hdr) ((SA_REGISTERED_LEN(sa, attr) == 0) ?\
hdr->sa_lengths[TOC_LEN_IDX(idx->sa_idx_tab[attr])] : \
SA_REGISTERED_LEN(sa, attr))
#define SA_SET_HDR(hdr, num, size) \
{ \
hdr->sa_magic = SA_MAGIC; \
SA_HDR_LAYOUT_INFO_ENCODE(hdr->sa_layout_info, num, size); \
}
#define SA_ATTR_INFO(sa, idx, hdr, attr, bulk, type, hdl) \
{ \
bulk.sa_size = SA_ATTR_LEN(sa, idx, attr, hdr); \
bulk.sa_buftype = type; \
bulk.sa_addr = \
(void *)((uintptr_t)TOC_OFF(idx->sa_idx_tab[attr]) + \
(uintptr_t)hdr); \
}
#define SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) \
(SA_HDR_SIZE(hdr) == (sizeof (sa_hdr_phys_t) + \
(tb->lot_var_sizes > 1 ? P2ROUNDUP((tb->lot_var_sizes - 1) * \
sizeof (uint16_t), 8) : 0)))
int sa_add_impl(sa_handle_t *, sa_attr_type_t,
uint32_t, sa_data_locator_t, void *, dmu_tx_t *);
void sa_register_update_callback_locked(objset_t *, sa_update_cb_t *);
int sa_size_locked(sa_handle_t *, sa_attr_type_t, int *);
void sa_default_locator(void **, uint32_t *, uint32_t, boolean_t, void *);
int sa_attr_size(sa_os_t *, sa_idx_tab_t *, sa_attr_type_t,
uint16_t *, sa_hdr_phys_t *);
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_SA_IMPL_H */