1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 */
25
26 #ifndef _SYS_SA_IMPL_H
27 #define _SYS_SA_IMPL_H
28
29 #include <sys/dmu.h>
30 #include <sys/refcount.h>
31 #include <sys/list.h>
32
33 /*
34 * Array of known attributes and their
35 * various characteristics.
36 */
37 typedef struct sa_attr_table {
38 sa_attr_type_t sa_attr;
39 uint8_t sa_registered;
40 uint16_t sa_length;
41 sa_bswap_type_t sa_byteswap;
42 char *sa_name;
43 } sa_attr_table_t;
44
45 /*
46 * Zap attribute format for attribute registration
47 *
48 * 64 56 48 40 32 24 16 8 0
49 * +-------+-------+-------+-------+-------+-------+-------+-------+
50 * | unused | len | bswap | attr num |
51 * +-------+-------+-------+-------+-------+-------+-------+-------+
52 *
53 * Zap attribute format for layout information.
54 *
55 * layout information is stored as an array of attribute numbers
56 * The name of the attribute is the layout number (0, 1, 2, ...)
57 *
58 * 16 0
59 * +---- ---+
60 * | attr # |
61 * +--------+
62 * | attr # |
63 * +--- ----+
64 * ......
65 *
66 */
67
68 #define ATTR_BSWAP(x) BF32_GET(x, 16, 8)
69 #define ATTR_LENGTH(x) BF32_GET(x, 24, 16)
70 #define ATTR_NUM(x) BF32_GET(x, 0, 16)
71 #define ATTR_ENCODE(x, attr, length, bswap) \
72 { \
73 BF64_SET(x, 24, 16, length); \
74 BF64_SET(x, 16, 8, bswap); \
75 BF64_SET(x, 0, 16, attr); \
76 }
77
78 #define TOC_OFF(x) BF32_GET(x, 0, 23)
79 #define TOC_ATTR_PRESENT(x) BF32_GET(x, 31, 1)
80 #define TOC_LEN_IDX(x) BF32_GET(x, 24, 4)
81 #define TOC_ATTR_ENCODE(x, len_idx, offset) \
82 { \
83 BF32_SET(x, 31, 1, 1); \
84 BF32_SET(x, 24, 7, len_idx); \
85 BF32_SET(x, 0, 24, offset); \
86 }
87
88 #define SA_LAYOUTS "LAYOUTS"
89 #define SA_REGISTRY "REGISTRY"
90
91 /*
92 * Each unique layout will have their own table
93 * sa_lot (layout_table)
94 */
95 typedef struct sa_lot {
96 avl_node_t lot_num_node;
97 avl_node_t lot_hash_node;
98 uint64_t lot_num;
99 uint64_t lot_hash;
100 sa_attr_type_t *lot_attrs; /* array of attr #'s */
101 uint32_t lot_var_sizes; /* how many aren't fixed size */
102 uint32_t lot_attr_count; /* total attr count */
103 list_t lot_idx_tab; /* should be only a couple of entries */
104 int lot_instance; /* used with lot_hash to identify entry */
105 } sa_lot_t;
106
107 /* index table of offsets */
108 typedef struct sa_idx_tab {
109 list_node_t sa_next;
110 sa_lot_t *sa_layout;
111 uint16_t *sa_variable_lengths;
112 refcount_t sa_refcount;
113 uint32_t *sa_idx_tab; /* array of offsets */
114 } sa_idx_tab_t;
115
116 /*
117 * Since the offset/index information into the actual data
118 * will usually be identical we can share that information with
119 * all handles that have the exact same offsets.
120 *
121 * You would typically only have a large number of different table of
122 * contents if you had a several variable sized attributes.
123 *
124 * Two AVL trees are used to track the attribute layout numbers.
125 * one is keyed by number and will be consulted when a DMU_OT_SA
126 * object is first read. The second tree is keyed by the hash signature
127 * of the attributes and will be consulted when an attribute is added
128 * to determine if we already have an instance of that layout. Both
129 * of these tree's are interconnected. The only difference is that
130 * when an entry is found in the "hash" tree the list of attributes will
131 * need to be compared against the list of attributes you have in hand.
132 * The assumption is that typically attributes will just be updated and
133 * adding a completely new attribute is a very rare operation.
134 */
135 struct sa_os {
136 kmutex_t sa_lock;
137 boolean_t sa_need_attr_registration;
138 boolean_t sa_force_spill;
139 uint64_t sa_master_obj;
140 uint64_t sa_reg_attr_obj;
141 uint64_t sa_layout_attr_obj;
142 int sa_num_attrs;
143 sa_attr_table_t *sa_attr_table; /* private attr table */
144 sa_update_cb_t *sa_update_cb;
145 avl_tree_t sa_layout_num_tree; /* keyed by layout number */
146 avl_tree_t sa_layout_hash_tree; /* keyed by layout hash value */
147 int sa_user_table_sz;
148 sa_attr_type_t *sa_user_table; /* user name->attr mapping table */
149 };
150
151 /*
152 * header for all bonus and spill buffers.
153 *
154 * The header has a fixed portion with a variable number
155 * of "lengths" depending on the number of variable sized
156 * attribues which are determined by the "layout number"
157 */
158
159 #define SA_MAGIC 0x2F505A /* ZFS SA */
160 typedef struct sa_hdr_phys {
161 uint32_t sa_magic;
162 /*
163 * Encoded with hdrsize and layout number as follows:
164 * 16 10 0
165 * +--------+-------+
166 * | hdrsz |layout |
167 * +--------+-------+
168 *
169 * Bits 0-10 are the layout number
170 * Bits 11-16 are the size of the header.
171 * The hdrsize is the number * 8
172 *
173 * For example.
174 * hdrsz of 1 ==> 8 byte header
175 * 2 ==> 16 byte header
176 *
177 */
178 uint16_t sa_layout_info;
179 uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */
180 /* ... Data follows the lengths. */
181 } sa_hdr_phys_t;
182
183 #define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
184 #define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0)
185 #define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
186 { \
187 BF32_SET_SB(x, 10, 6, 3, 0, size); \
188 BF32_SET(x, 0, 10, num); \
189 }
190
191 typedef enum sa_buf_type {
192 SA_BONUS = 1,
193 SA_SPILL = 2
194 } sa_buf_type_t;
195
196 typedef enum sa_data_op {
197 SA_LOOKUP,
198 SA_UPDATE,
199 SA_ADD,
200 SA_REPLACE,
201 SA_REMOVE
202 } sa_data_op_t;
203
204 /*
205 * Opaque handle used for most sa functions
206 *
207 * This needs to be kept as small as possible.
208 */
209
210 struct sa_handle {
211 kmutex_t sa_lock;
212 dmu_buf_t *sa_bonus;
213 dmu_buf_t *sa_spill;
214 objset_t *sa_os;
215 void *sa_userp;
216 sa_idx_tab_t *sa_bonus_tab; /* idx of bonus */
217 sa_idx_tab_t *sa_spill_tab; /* only present if spill activated */
218 };
219
220 #define SA_GET_DB(hdl, type) \
221 (dmu_buf_impl_t *)((type == SA_BONUS) ? hdl->sa_bonus : hdl->sa_spill)
222
223 #define SA_GET_HDR(hdl, type) \
224 ((sa_hdr_phys_t *)((dmu_buf_impl_t *)(SA_GET_DB(hdl, \
225 type))->db.db_data))
226
227 #define SA_IDX_TAB_GET(hdl, type) \
228 (type == SA_BONUS ? hdl->sa_bonus_tab : hdl->sa_spill_tab)
229
230 #define IS_SA_BONUSTYPE(a) \
231 ((a == DMU_OT_SA) ? B_TRUE : B_FALSE)
232
233 #define SA_BONUSTYPE_FROM_DB(db) \
234 (dmu_get_bonustype((dmu_buf_t *)db))
235
236 #define SA_BLKPTR_SPACE (DN_MAX_BONUSLEN - sizeof (blkptr_t))
237
238 #define SA_LAYOUT_NUM(x, type) \
239 ((!IS_SA_BONUSTYPE(type) ? 0 : (((IS_SA_BONUSTYPE(type)) && \
240 ((SA_HDR_LAYOUT_NUM(x)) == 0)) ? 1 : SA_HDR_LAYOUT_NUM(x))))
241
242
243 #define SA_REGISTERED_LEN(sa, attr) sa->sa_attr_table[attr].sa_length
244
245 #define SA_ATTR_LEN(sa, idx, attr, hdr) ((SA_REGISTERED_LEN(sa, attr) == 0) ?\
246 hdr->sa_lengths[TOC_LEN_IDX(idx->sa_idx_tab[attr])] : \
247 SA_REGISTERED_LEN(sa, attr))
248
249 #define SA_SET_HDR(hdr, num, size) \
250 { \
251 hdr->sa_magic = SA_MAGIC; \
252 SA_HDR_LAYOUT_INFO_ENCODE(hdr->sa_layout_info, num, size); \
253 }
254
255 #define SA_ATTR_INFO(sa, idx, hdr, attr, bulk, type, hdl) \
256 { \
257 bulk.sa_size = SA_ATTR_LEN(sa, idx, attr, hdr); \
258 bulk.sa_buftype = type; \
259 bulk.sa_addr = \
260 (void *)((uintptr_t)TOC_OFF(idx->sa_idx_tab[attr]) + \
261 (uintptr_t)hdr); \
262 }
263
264 #define SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) \
265 (SA_HDR_SIZE(hdr) == (sizeof (sa_hdr_phys_t) + \
266 (tb->lot_var_sizes > 1 ? P2ROUNDUP((tb->lot_var_sizes - 1) * \
267 sizeof (uint16_t), 8) : 0)))
268
269 int sa_add_impl(sa_handle_t *, sa_attr_type_t,
270 uint32_t, sa_data_locator_t, void *, dmu_tx_t *);
271
272 void sa_register_update_callback_locked(objset_t *, sa_update_cb_t *);
273 int sa_size_locked(sa_handle_t *, sa_attr_type_t, int *);
274
275 void sa_default_locator(void **, uint32_t *, uint32_t, boolean_t, void *);
276 int sa_attr_size(sa_os_t *, sa_idx_tab_t *, sa_attr_type_t,
277 uint16_t *, sa_hdr_phys_t *);
278
279 #ifdef __cplusplus
280 extern "C" {
281 #endif
282
283 #ifdef __cplusplus
284 }
285 #endif
286
287 #endif /* _SYS_SA_IMPL_H */