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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <sys/zfs_context.h>
27#include <sys/spa.h>
28#include <sys/dmu.h>
29#include <sys/zio.h>
30#include <sys/space_map.h>
31
32/*
33 * Space map routines.
34 * NOTE: caller is responsible for all locking.
35 */
36static int
37space_map_seg_compare(const void *x1, const void *x2)
38{
39 const space_seg_t *s1 = x1;
40 const space_seg_t *s2 = x2;
41
42 if (s1->ss_start < s2->ss_start) {
43 if (s1->ss_end > s2->ss_start)
44 return (0);
45 return (-1);
46 }
47 if (s1->ss_start > s2->ss_start) {
48 if (s1->ss_start < s2->ss_end)
49 return (0);
50 return (1);
51 }
52 return (0);
53}
54
55void
56space_map_create(space_map_t *sm, uint64_t start, uint64_t size, uint8_t shift,
57 kmutex_t *lp)
58{
59 bzero(sm, sizeof (*sm));
60
61 cv_init(&sm->sm_load_cv, NULL, CV_DEFAULT, NULL);
62
63 avl_create(&sm->sm_root, space_map_seg_compare,
64 sizeof (space_seg_t), offsetof(struct space_seg, ss_node));
65
66 sm->sm_start = start;
67 sm->sm_size = size;
68 sm->sm_shift = shift;
69 sm->sm_lock = lp;
70}
71
72void
73space_map_destroy(space_map_t *sm)
74{
75 ASSERT(!sm->sm_loaded && !sm->sm_loading);
76 VERIFY3U(sm->sm_space, ==, 0);
77 avl_destroy(&sm->sm_root);
78 cv_destroy(&sm->sm_load_cv);
79}
80
81void
82space_map_add(space_map_t *sm, uint64_t start, uint64_t size)
83{
84 avl_index_t where;
85 space_seg_t ssearch, *ss_before, *ss_after, *ss;
86 uint64_t end = start + size;
87 int merge_before, merge_after;
88
89 ASSERT(MUTEX_HELD(sm->sm_lock));
90 VERIFY(size != 0);
91 VERIFY3U(start, >=, sm->sm_start);
92 VERIFY3U(end, <=, sm->sm_start + sm->sm_size);
93 VERIFY(sm->sm_space + size <= sm->sm_size);
94 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
95 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
96
97 ssearch.ss_start = start;
98 ssearch.ss_end = end;
99 ss = avl_find(&sm->sm_root, &ssearch, &where);
100
101 if (ss != NULL && ss->ss_start <= start && ss->ss_end >= end) {
102 zfs_panic_recover("zfs: allocating allocated segment"
103 "(offset=%llu size=%llu)\n",
104 (longlong_t)start, (longlong_t)size);
105 return;
106 }
107
108 /* Make sure we don't overlap with either of our neighbors */
109 VERIFY(ss == NULL);
110
111 ss_before = avl_nearest(&sm->sm_root, where, AVL_BEFORE);
112 ss_after = avl_nearest(&sm->sm_root, where, AVL_AFTER);
113
114 merge_before = (ss_before != NULL && ss_before->ss_end == start);
115 merge_after = (ss_after != NULL && ss_after->ss_start == end);
116
117 if (merge_before && merge_after) {
118 avl_remove(&sm->sm_root, ss_before);
119 if (sm->sm_pp_root) {
120 avl_remove(sm->sm_pp_root, ss_before);
121 avl_remove(sm->sm_pp_root, ss_after);
122 }
123 ss_after->ss_start = ss_before->ss_start;
124 kmem_free(ss_before, sizeof (*ss_before));
125 ss = ss_after;
126 } else if (merge_before) {
127 ss_before->ss_end = end;
128 if (sm->sm_pp_root)
129 avl_remove(sm->sm_pp_root, ss_before);
130 ss = ss_before;
131 } else if (merge_after) {
132 ss_after->ss_start = start;
133 if (sm->sm_pp_root)
134 avl_remove(sm->sm_pp_root, ss_after);
135 ss = ss_after;
136 } else {
137 ss = kmem_alloc(sizeof (*ss), KM_SLEEP);
138 ss->ss_start = start;
139 ss->ss_end = end;
140 avl_insert(&sm->sm_root, ss, where);
141 }
142
143 if (sm->sm_pp_root)
144 avl_add(sm->sm_pp_root, ss);
145
146 sm->sm_space += size;
147}
148
149void
150space_map_remove(space_map_t *sm, uint64_t start, uint64_t size)
151{
152 avl_index_t where;
153 space_seg_t ssearch, *ss, *newseg;
154 uint64_t end = start + size;
155 int left_over, right_over;
156
157 ASSERT(MUTEX_HELD(sm->sm_lock));
158 VERIFY(size != 0);
159 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
160 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
161
162 ssearch.ss_start = start;
163 ssearch.ss_end = end;
164 ss = avl_find(&sm->sm_root, &ssearch, &where);
165
166 /* Make sure we completely overlap with someone */
167 if (ss == NULL) {
168 zfs_panic_recover("zfs: freeing free segment "
169 "(offset=%llu size=%llu)",
170 (longlong_t)start, (longlong_t)size);
171 return;
172 }
173 VERIFY3U(ss->ss_start, <=, start);
174 VERIFY3U(ss->ss_end, >=, end);
175 VERIFY(sm->sm_space - size <= sm->sm_size);
176
177 left_over = (ss->ss_start != start);
178 right_over = (ss->ss_end != end);
179
180 if (sm->sm_pp_root)
181 avl_remove(sm->sm_pp_root, ss);
182
183 if (left_over && right_over) {
184 newseg = kmem_alloc(sizeof (*newseg), KM_SLEEP);
185 newseg->ss_start = end;
186 newseg->ss_end = ss->ss_end;
187 ss->ss_end = start;
188 avl_insert_here(&sm->sm_root, newseg, ss, AVL_AFTER);
189 if (sm->sm_pp_root)
190 avl_add(sm->sm_pp_root, newseg);
191 } else if (left_over) {
192 ss->ss_end = start;
193 } else if (right_over) {
194 ss->ss_start = end;
195 } else {
196 avl_remove(&sm->sm_root, ss);
197 kmem_free(ss, sizeof (*ss));
198 ss = NULL;
199 }
200
201 if (sm->sm_pp_root && ss != NULL)
202 avl_add(sm->sm_pp_root, ss);
203
204 sm->sm_space -= size;
205}
206
207boolean_t
208space_map_contains(space_map_t *sm, uint64_t start, uint64_t size)
209{
210 avl_index_t where;
211 space_seg_t ssearch, *ss;
212 uint64_t end = start + size;
213
214 ASSERT(MUTEX_HELD(sm->sm_lock));
215 VERIFY(size != 0);
216 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
217 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
218
219 ssearch.ss_start = start;
220 ssearch.ss_end = end;
221 ss = avl_find(&sm->sm_root, &ssearch, &where);
222
223 return (ss != NULL && ss->ss_start <= start && ss->ss_end >= end);
224}
225
226void
227space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest)
228{
229 space_seg_t *ss;
230 void *cookie = NULL;
231
232 ASSERT(MUTEX_HELD(sm->sm_lock));
233
234 while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
235 if (func != NULL)
236 func(mdest, ss->ss_start, ss->ss_end - ss->ss_start);
237 kmem_free(ss, sizeof (*ss));
238 }
239 sm->sm_space = 0;
240}
241
242void
243space_map_walk(space_map_t *sm, space_map_func_t *func, space_map_t *mdest)
244{
245 space_seg_t *ss;
246
247 ASSERT(MUTEX_HELD(sm->sm_lock));
248
249 for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss))
250 func(mdest, ss->ss_start, ss->ss_end - ss->ss_start);
251}
252
253/*
254 * Wait for any in-progress space_map_load() to complete.
255 */
256void
257space_map_load_wait(space_map_t *sm)
258{
259 ASSERT(MUTEX_HELD(sm->sm_lock));
260
261 while (sm->sm_loading)
262 cv_wait(&sm->sm_load_cv, sm->sm_lock);
263}
264
265/*
266 * Note: space_map_load() will drop sm_lock across dmu_read() calls.
267 * The caller must be OK with this.
268 */
269int
270space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype,
271 space_map_obj_t *smo, objset_t *os)
272{
273 uint64_t *entry, *entry_map, *entry_map_end;
274 uint64_t bufsize, size, offset, end, space;
275 uint64_t mapstart = sm->sm_start;
276 int error = 0;
277
278 ASSERT(MUTEX_HELD(sm->sm_lock));
279
280 space_map_load_wait(sm);
281
282 if (sm->sm_loaded)
283 return (0);
284
285 sm->sm_loading = B_TRUE;
286 end = smo->smo_objsize;
287 space = smo->smo_alloc;
288
289 ASSERT(sm->sm_ops == NULL);
290 VERIFY3U(sm->sm_space, ==, 0);
291
292 if (maptype == SM_FREE) {
293 space_map_add(sm, sm->sm_start, sm->sm_size);
294 space = sm->sm_size - space;
295 }
296
297 bufsize = 1ULL << SPACE_MAP_BLOCKSHIFT;
298 entry_map = zio_buf_alloc(bufsize);
299
300 mutex_exit(sm->sm_lock);
301 if (end > bufsize)
302 dmu_prefetch(os, smo->smo_object, bufsize, end - bufsize);
303 mutex_enter(sm->sm_lock);
304
305 for (offset = 0; offset < end; offset += bufsize) {
306 size = MIN(end - offset, bufsize);
307 VERIFY(P2PHASE(size, sizeof (uint64_t)) == 0);
308 VERIFY(size != 0);
309
310 dprintf("object=%llu offset=%llx size=%llx\n",
311 smo->smo_object, offset, size);
312
313 mutex_exit(sm->sm_lock);
314 error = dmu_read(os, smo->smo_object, offset, size, entry_map,
315 DMU_READ_PREFETCH);
316 mutex_enter(sm->sm_lock);
317 if (error != 0)
318 break;
319
320 entry_map_end = entry_map + (size / sizeof (uint64_t));
321 for (entry = entry_map; entry < entry_map_end; entry++) {
322 uint64_t e = *entry;
323
324 if (SM_DEBUG_DECODE(e)) /* Skip debug entries */
325 continue;
326
327 (SM_TYPE_DECODE(e) == maptype ?
328 space_map_add : space_map_remove)(sm,
329 (SM_OFFSET_DECODE(e) << sm->sm_shift) + mapstart,
330 SM_RUN_DECODE(e) << sm->sm_shift);
331 }
332 }
333
334 if (error == 0) {
335 VERIFY3U(sm->sm_space, ==, space);
336
337 sm->sm_loaded = B_TRUE;
338 sm->sm_ops = ops;
339 if (ops != NULL)
340 ops->smop_load(sm);
341 } else {
342 space_map_vacate(sm, NULL, NULL);
343 }
344
345 zio_buf_free(entry_map, bufsize);
346
347 sm->sm_loading = B_FALSE;
348
349 cv_broadcast(&sm->sm_load_cv);
350
351 return (error);
352}
353
354void
355space_map_unload(space_map_t *sm)
356{
357 ASSERT(MUTEX_HELD(sm->sm_lock));
358
359 if (sm->sm_loaded && sm->sm_ops != NULL)
360 sm->sm_ops->smop_unload(sm);
361
362 sm->sm_loaded = B_FALSE;
363 sm->sm_ops = NULL;
364
365 space_map_vacate(sm, NULL, NULL);
366}
367
368uint64_t
369space_map_maxsize(space_map_t *sm)
370{
| 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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <sys/zfs_context.h>
27#include <sys/spa.h>
28#include <sys/dmu.h>
29#include <sys/zio.h>
30#include <sys/space_map.h>
31
32/*
33 * Space map routines.
34 * NOTE: caller is responsible for all locking.
35 */
36static int
37space_map_seg_compare(const void *x1, const void *x2)
38{
39 const space_seg_t *s1 = x1;
40 const space_seg_t *s2 = x2;
41
42 if (s1->ss_start < s2->ss_start) {
43 if (s1->ss_end > s2->ss_start)
44 return (0);
45 return (-1);
46 }
47 if (s1->ss_start > s2->ss_start) {
48 if (s1->ss_start < s2->ss_end)
49 return (0);
50 return (1);
51 }
52 return (0);
53}
54
55void
56space_map_create(space_map_t *sm, uint64_t start, uint64_t size, uint8_t shift,
57 kmutex_t *lp)
58{
59 bzero(sm, sizeof (*sm));
60
61 cv_init(&sm->sm_load_cv, NULL, CV_DEFAULT, NULL);
62
63 avl_create(&sm->sm_root, space_map_seg_compare,
64 sizeof (space_seg_t), offsetof(struct space_seg, ss_node));
65
66 sm->sm_start = start;
67 sm->sm_size = size;
68 sm->sm_shift = shift;
69 sm->sm_lock = lp;
70}
71
72void
73space_map_destroy(space_map_t *sm)
74{
75 ASSERT(!sm->sm_loaded && !sm->sm_loading);
76 VERIFY3U(sm->sm_space, ==, 0);
77 avl_destroy(&sm->sm_root);
78 cv_destroy(&sm->sm_load_cv);
79}
80
81void
82space_map_add(space_map_t *sm, uint64_t start, uint64_t size)
83{
84 avl_index_t where;
85 space_seg_t ssearch, *ss_before, *ss_after, *ss;
86 uint64_t end = start + size;
87 int merge_before, merge_after;
88
89 ASSERT(MUTEX_HELD(sm->sm_lock));
90 VERIFY(size != 0);
91 VERIFY3U(start, >=, sm->sm_start);
92 VERIFY3U(end, <=, sm->sm_start + sm->sm_size);
93 VERIFY(sm->sm_space + size <= sm->sm_size);
94 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
95 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
96
97 ssearch.ss_start = start;
98 ssearch.ss_end = end;
99 ss = avl_find(&sm->sm_root, &ssearch, &where);
100
101 if (ss != NULL && ss->ss_start <= start && ss->ss_end >= end) {
102 zfs_panic_recover("zfs: allocating allocated segment"
103 "(offset=%llu size=%llu)\n",
104 (longlong_t)start, (longlong_t)size);
105 return;
106 }
107
108 /* Make sure we don't overlap with either of our neighbors */
109 VERIFY(ss == NULL);
110
111 ss_before = avl_nearest(&sm->sm_root, where, AVL_BEFORE);
112 ss_after = avl_nearest(&sm->sm_root, where, AVL_AFTER);
113
114 merge_before = (ss_before != NULL && ss_before->ss_end == start);
115 merge_after = (ss_after != NULL && ss_after->ss_start == end);
116
117 if (merge_before && merge_after) {
118 avl_remove(&sm->sm_root, ss_before);
119 if (sm->sm_pp_root) {
120 avl_remove(sm->sm_pp_root, ss_before);
121 avl_remove(sm->sm_pp_root, ss_after);
122 }
123 ss_after->ss_start = ss_before->ss_start;
124 kmem_free(ss_before, sizeof (*ss_before));
125 ss = ss_after;
126 } else if (merge_before) {
127 ss_before->ss_end = end;
128 if (sm->sm_pp_root)
129 avl_remove(sm->sm_pp_root, ss_before);
130 ss = ss_before;
131 } else if (merge_after) {
132 ss_after->ss_start = start;
133 if (sm->sm_pp_root)
134 avl_remove(sm->sm_pp_root, ss_after);
135 ss = ss_after;
136 } else {
137 ss = kmem_alloc(sizeof (*ss), KM_SLEEP);
138 ss->ss_start = start;
139 ss->ss_end = end;
140 avl_insert(&sm->sm_root, ss, where);
141 }
142
143 if (sm->sm_pp_root)
144 avl_add(sm->sm_pp_root, ss);
145
146 sm->sm_space += size;
147}
148
149void
150space_map_remove(space_map_t *sm, uint64_t start, uint64_t size)
151{
152 avl_index_t where;
153 space_seg_t ssearch, *ss, *newseg;
154 uint64_t end = start + size;
155 int left_over, right_over;
156
157 ASSERT(MUTEX_HELD(sm->sm_lock));
158 VERIFY(size != 0);
159 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
160 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
161
162 ssearch.ss_start = start;
163 ssearch.ss_end = end;
164 ss = avl_find(&sm->sm_root, &ssearch, &where);
165
166 /* Make sure we completely overlap with someone */
167 if (ss == NULL) {
168 zfs_panic_recover("zfs: freeing free segment "
169 "(offset=%llu size=%llu)",
170 (longlong_t)start, (longlong_t)size);
171 return;
172 }
173 VERIFY3U(ss->ss_start, <=, start);
174 VERIFY3U(ss->ss_end, >=, end);
175 VERIFY(sm->sm_space - size <= sm->sm_size);
176
177 left_over = (ss->ss_start != start);
178 right_over = (ss->ss_end != end);
179
180 if (sm->sm_pp_root)
181 avl_remove(sm->sm_pp_root, ss);
182
183 if (left_over && right_over) {
184 newseg = kmem_alloc(sizeof (*newseg), KM_SLEEP);
185 newseg->ss_start = end;
186 newseg->ss_end = ss->ss_end;
187 ss->ss_end = start;
188 avl_insert_here(&sm->sm_root, newseg, ss, AVL_AFTER);
189 if (sm->sm_pp_root)
190 avl_add(sm->sm_pp_root, newseg);
191 } else if (left_over) {
192 ss->ss_end = start;
193 } else if (right_over) {
194 ss->ss_start = end;
195 } else {
196 avl_remove(&sm->sm_root, ss);
197 kmem_free(ss, sizeof (*ss));
198 ss = NULL;
199 }
200
201 if (sm->sm_pp_root && ss != NULL)
202 avl_add(sm->sm_pp_root, ss);
203
204 sm->sm_space -= size;
205}
206
207boolean_t
208space_map_contains(space_map_t *sm, uint64_t start, uint64_t size)
209{
210 avl_index_t where;
211 space_seg_t ssearch, *ss;
212 uint64_t end = start + size;
213
214 ASSERT(MUTEX_HELD(sm->sm_lock));
215 VERIFY(size != 0);
216 VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0);
217 VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0);
218
219 ssearch.ss_start = start;
220 ssearch.ss_end = end;
221 ss = avl_find(&sm->sm_root, &ssearch, &where);
222
223 return (ss != NULL && ss->ss_start <= start && ss->ss_end >= end);
224}
225
226void
227space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest)
228{
229 space_seg_t *ss;
230 void *cookie = NULL;
231
232 ASSERT(MUTEX_HELD(sm->sm_lock));
233
234 while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
235 if (func != NULL)
236 func(mdest, ss->ss_start, ss->ss_end - ss->ss_start);
237 kmem_free(ss, sizeof (*ss));
238 }
239 sm->sm_space = 0;
240}
241
242void
243space_map_walk(space_map_t *sm, space_map_func_t *func, space_map_t *mdest)
244{
245 space_seg_t *ss;
246
247 ASSERT(MUTEX_HELD(sm->sm_lock));
248
249 for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss))
250 func(mdest, ss->ss_start, ss->ss_end - ss->ss_start);
251}
252
253/*
254 * Wait for any in-progress space_map_load() to complete.
255 */
256void
257space_map_load_wait(space_map_t *sm)
258{
259 ASSERT(MUTEX_HELD(sm->sm_lock));
260
261 while (sm->sm_loading)
262 cv_wait(&sm->sm_load_cv, sm->sm_lock);
263}
264
265/*
266 * Note: space_map_load() will drop sm_lock across dmu_read() calls.
267 * The caller must be OK with this.
268 */
269int
270space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype,
271 space_map_obj_t *smo, objset_t *os)
272{
273 uint64_t *entry, *entry_map, *entry_map_end;
274 uint64_t bufsize, size, offset, end, space;
275 uint64_t mapstart = sm->sm_start;
276 int error = 0;
277
278 ASSERT(MUTEX_HELD(sm->sm_lock));
279
280 space_map_load_wait(sm);
281
282 if (sm->sm_loaded)
283 return (0);
284
285 sm->sm_loading = B_TRUE;
286 end = smo->smo_objsize;
287 space = smo->smo_alloc;
288
289 ASSERT(sm->sm_ops == NULL);
290 VERIFY3U(sm->sm_space, ==, 0);
291
292 if (maptype == SM_FREE) {
293 space_map_add(sm, sm->sm_start, sm->sm_size);
294 space = sm->sm_size - space;
295 }
296
297 bufsize = 1ULL << SPACE_MAP_BLOCKSHIFT;
298 entry_map = zio_buf_alloc(bufsize);
299
300 mutex_exit(sm->sm_lock);
301 if (end > bufsize)
302 dmu_prefetch(os, smo->smo_object, bufsize, end - bufsize);
303 mutex_enter(sm->sm_lock);
304
305 for (offset = 0; offset < end; offset += bufsize) {
306 size = MIN(end - offset, bufsize);
307 VERIFY(P2PHASE(size, sizeof (uint64_t)) == 0);
308 VERIFY(size != 0);
309
310 dprintf("object=%llu offset=%llx size=%llx\n",
311 smo->smo_object, offset, size);
312
313 mutex_exit(sm->sm_lock);
314 error = dmu_read(os, smo->smo_object, offset, size, entry_map,
315 DMU_READ_PREFETCH);
316 mutex_enter(sm->sm_lock);
317 if (error != 0)
318 break;
319
320 entry_map_end = entry_map + (size / sizeof (uint64_t));
321 for (entry = entry_map; entry < entry_map_end; entry++) {
322 uint64_t e = *entry;
323
324 if (SM_DEBUG_DECODE(e)) /* Skip debug entries */
325 continue;
326
327 (SM_TYPE_DECODE(e) == maptype ?
328 space_map_add : space_map_remove)(sm,
329 (SM_OFFSET_DECODE(e) << sm->sm_shift) + mapstart,
330 SM_RUN_DECODE(e) << sm->sm_shift);
331 }
332 }
333
334 if (error == 0) {
335 VERIFY3U(sm->sm_space, ==, space);
336
337 sm->sm_loaded = B_TRUE;
338 sm->sm_ops = ops;
339 if (ops != NULL)
340 ops->smop_load(sm);
341 } else {
342 space_map_vacate(sm, NULL, NULL);
343 }
344
345 zio_buf_free(entry_map, bufsize);
346
347 sm->sm_loading = B_FALSE;
348
349 cv_broadcast(&sm->sm_load_cv);
350
351 return (error);
352}
353
354void
355space_map_unload(space_map_t *sm)
356{
357 ASSERT(MUTEX_HELD(sm->sm_lock));
358
359 if (sm->sm_loaded && sm->sm_ops != NULL)
360 sm->sm_ops->smop_unload(sm);
361
362 sm->sm_loaded = B_FALSE;
363 sm->sm_ops = NULL;
364
365 space_map_vacate(sm, NULL, NULL);
366}
367
368uint64_t
369space_map_maxsize(space_map_t *sm)
370{
|
375}
376
377uint64_t
378space_map_alloc(space_map_t *sm, uint64_t size)
379{
380 uint64_t start;
381
382 start = sm->sm_ops->smop_alloc(sm, size);
383 if (start != -1ULL)
384 space_map_remove(sm, start, size);
385 return (start);
386}
387
388void
389space_map_claim(space_map_t *sm, uint64_t start, uint64_t size)
390{
391 sm->sm_ops->smop_claim(sm, start, size);
392 space_map_remove(sm, start, size);
393}
394
395void
396space_map_free(space_map_t *sm, uint64_t start, uint64_t size)
397{
398 space_map_add(sm, start, size);
399 sm->sm_ops->smop_free(sm, start, size);
400}
401
402/*
403 * Note: space_map_sync() will drop sm_lock across dmu_write() calls.
404 */
405void
406space_map_sync(space_map_t *sm, uint8_t maptype,
407 space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx)
408{
409 spa_t *spa = dmu_objset_spa(os);
410 void *cookie = NULL;
411 space_seg_t *ss;
412 uint64_t bufsize, start, size, run_len;
413 uint64_t *entry, *entry_map, *entry_map_end;
414
415 ASSERT(MUTEX_HELD(sm->sm_lock));
416
417 if (sm->sm_space == 0)
418 return;
419
420 dprintf("object %4llu, txg %llu, pass %d, %c, count %lu, space %llx\n",
421 smo->smo_object, dmu_tx_get_txg(tx), spa_sync_pass(spa),
422 maptype == SM_ALLOC ? 'A' : 'F', avl_numnodes(&sm->sm_root),
423 sm->sm_space);
424
425 if (maptype == SM_ALLOC)
426 smo->smo_alloc += sm->sm_space;
427 else
428 smo->smo_alloc -= sm->sm_space;
429
430 bufsize = (8 + avl_numnodes(&sm->sm_root)) * sizeof (uint64_t);
431 bufsize = MIN(bufsize, 1ULL << SPACE_MAP_BLOCKSHIFT);
432 entry_map = zio_buf_alloc(bufsize);
433 entry_map_end = entry_map + (bufsize / sizeof (uint64_t));
434 entry = entry_map;
435
436 *entry++ = SM_DEBUG_ENCODE(1) |
437 SM_DEBUG_ACTION_ENCODE(maptype) |
438 SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(spa)) |
439 SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx));
440
441 while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
442 size = ss->ss_end - ss->ss_start;
443 start = (ss->ss_start - sm->sm_start) >> sm->sm_shift;
444
445 sm->sm_space -= size;
446 size >>= sm->sm_shift;
447
448 while (size) {
449 run_len = MIN(size, SM_RUN_MAX);
450
451 if (entry == entry_map_end) {
452 mutex_exit(sm->sm_lock);
453 dmu_write(os, smo->smo_object, smo->smo_objsize,
454 bufsize, entry_map, tx);
455 mutex_enter(sm->sm_lock);
456 smo->smo_objsize += bufsize;
457 entry = entry_map;
458 }
459
460 *entry++ = SM_OFFSET_ENCODE(start) |
461 SM_TYPE_ENCODE(maptype) |
462 SM_RUN_ENCODE(run_len);
463
464 start += run_len;
465 size -= run_len;
466 }
467 kmem_free(ss, sizeof (*ss));
468 }
469
470 if (entry != entry_map) {
471 size = (entry - entry_map) * sizeof (uint64_t);
472 mutex_exit(sm->sm_lock);
473 dmu_write(os, smo->smo_object, smo->smo_objsize,
474 size, entry_map, tx);
475 mutex_enter(sm->sm_lock);
476 smo->smo_objsize += size;
477 }
478
479 zio_buf_free(entry_map, bufsize);
480
481 VERIFY3U(sm->sm_space, ==, 0);
482}
483
484void
485space_map_truncate(space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx)
486{
487 VERIFY(dmu_free_range(os, smo->smo_object, 0, -1ULL, tx) == 0);
488
489 smo->smo_objsize = 0;
490 smo->smo_alloc = 0;
491}
492
493/*
494 * Space map reference trees.
495 *
496 * A space map is a collection of integers. Every integer is either
497 * in the map, or it's not. A space map reference tree generalizes
498 * the idea: it allows its members to have arbitrary reference counts,
499 * as opposed to the implicit reference count of 0 or 1 in a space map.
500 * This representation comes in handy when computing the union or
501 * intersection of multiple space maps. For example, the union of
502 * N space maps is the subset of the reference tree with refcnt >= 1.
503 * The intersection of N space maps is the subset with refcnt >= N.
504 *
505 * [It's very much like a Fourier transform. Unions and intersections
506 * are hard to perform in the 'space map domain', so we convert the maps
507 * into the 'reference count domain', where it's trivial, then invert.]
508 *
509 * vdev_dtl_reassess() uses computations of this form to determine
510 * DTL_MISSING and DTL_OUTAGE for interior vdevs -- e.g. a RAID-Z vdev
511 * has an outage wherever refcnt >= vdev_nparity + 1, and a mirror vdev
512 * has an outage wherever refcnt >= vdev_children.
513 */
514static int
515space_map_ref_compare(const void *x1, const void *x2)
516{
517 const space_ref_t *sr1 = x1;
518 const space_ref_t *sr2 = x2;
519
520 if (sr1->sr_offset < sr2->sr_offset)
521 return (-1);
522 if (sr1->sr_offset > sr2->sr_offset)
523 return (1);
524
525 if (sr1 < sr2)
526 return (-1);
527 if (sr1 > sr2)
528 return (1);
529
530 return (0);
531}
532
533void
534space_map_ref_create(avl_tree_t *t)
535{
536 avl_create(t, space_map_ref_compare,
537 sizeof (space_ref_t), offsetof(space_ref_t, sr_node));
538}
539
540void
541space_map_ref_destroy(avl_tree_t *t)
542{
543 space_ref_t *sr;
544 void *cookie = NULL;
545
546 while ((sr = avl_destroy_nodes(t, &cookie)) != NULL)
547 kmem_free(sr, sizeof (*sr));
548
549 avl_destroy(t);
550}
551
552static void
553space_map_ref_add_node(avl_tree_t *t, uint64_t offset, int64_t refcnt)
554{
555 space_ref_t *sr;
556
557 sr = kmem_alloc(sizeof (*sr), KM_SLEEP);
558 sr->sr_offset = offset;
559 sr->sr_refcnt = refcnt;
560
561 avl_add(t, sr);
562}
563
564void
565space_map_ref_add_seg(avl_tree_t *t, uint64_t start, uint64_t end,
566 int64_t refcnt)
567{
568 space_map_ref_add_node(t, start, refcnt);
569 space_map_ref_add_node(t, end, -refcnt);
570}
571
572/*
573 * Convert (or add) a space map into a reference tree.
574 */
575void
576space_map_ref_add_map(avl_tree_t *t, space_map_t *sm, int64_t refcnt)
577{
578 space_seg_t *ss;
579
580 ASSERT(MUTEX_HELD(sm->sm_lock));
581
582 for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss))
583 space_map_ref_add_seg(t, ss->ss_start, ss->ss_end, refcnt);
584}
585
586/*
587 * Convert a reference tree into a space map. The space map will contain
588 * all members of the reference tree for which refcnt >= minref.
589 */
590void
591space_map_ref_generate_map(avl_tree_t *t, space_map_t *sm, int64_t minref)
592{
593 uint64_t start = -1ULL;
594 int64_t refcnt = 0;
595 space_ref_t *sr;
596
597 ASSERT(MUTEX_HELD(sm->sm_lock));
598
599 space_map_vacate(sm, NULL, NULL);
600
601 for (sr = avl_first(t); sr != NULL; sr = AVL_NEXT(t, sr)) {
602 refcnt += sr->sr_refcnt;
603 if (refcnt >= minref) {
604 if (start == -1ULL) {
605 start = sr->sr_offset;
606 }
607 } else {
608 if (start != -1ULL) {
609 uint64_t end = sr->sr_offset;
610 ASSERT(start <= end);
611 if (end > start)
612 space_map_add(sm, start, end - start);
613 start = -1ULL;
614 }
615 }
616 }
617 ASSERT(refcnt == 0);
618 ASSERT(start == -1ULL);
619}
| 373}
374
375uint64_t
376space_map_alloc(space_map_t *sm, uint64_t size)
377{
378 uint64_t start;
379
380 start = sm->sm_ops->smop_alloc(sm, size);
381 if (start != -1ULL)
382 space_map_remove(sm, start, size);
383 return (start);
384}
385
386void
387space_map_claim(space_map_t *sm, uint64_t start, uint64_t size)
388{
389 sm->sm_ops->smop_claim(sm, start, size);
390 space_map_remove(sm, start, size);
391}
392
393void
394space_map_free(space_map_t *sm, uint64_t start, uint64_t size)
395{
396 space_map_add(sm, start, size);
397 sm->sm_ops->smop_free(sm, start, size);
398}
399
400/*
401 * Note: space_map_sync() will drop sm_lock across dmu_write() calls.
402 */
403void
404space_map_sync(space_map_t *sm, uint8_t maptype,
405 space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx)
406{
407 spa_t *spa = dmu_objset_spa(os);
408 void *cookie = NULL;
409 space_seg_t *ss;
410 uint64_t bufsize, start, size, run_len;
411 uint64_t *entry, *entry_map, *entry_map_end;
412
413 ASSERT(MUTEX_HELD(sm->sm_lock));
414
415 if (sm->sm_space == 0)
416 return;
417
418 dprintf("object %4llu, txg %llu, pass %d, %c, count %lu, space %llx\n",
419 smo->smo_object, dmu_tx_get_txg(tx), spa_sync_pass(spa),
420 maptype == SM_ALLOC ? 'A' : 'F', avl_numnodes(&sm->sm_root),
421 sm->sm_space);
422
423 if (maptype == SM_ALLOC)
424 smo->smo_alloc += sm->sm_space;
425 else
426 smo->smo_alloc -= sm->sm_space;
427
428 bufsize = (8 + avl_numnodes(&sm->sm_root)) * sizeof (uint64_t);
429 bufsize = MIN(bufsize, 1ULL << SPACE_MAP_BLOCKSHIFT);
430 entry_map = zio_buf_alloc(bufsize);
431 entry_map_end = entry_map + (bufsize / sizeof (uint64_t));
432 entry = entry_map;
433
434 *entry++ = SM_DEBUG_ENCODE(1) |
435 SM_DEBUG_ACTION_ENCODE(maptype) |
436 SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(spa)) |
437 SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx));
438
439 while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
440 size = ss->ss_end - ss->ss_start;
441 start = (ss->ss_start - sm->sm_start) >> sm->sm_shift;
442
443 sm->sm_space -= size;
444 size >>= sm->sm_shift;
445
446 while (size) {
447 run_len = MIN(size, SM_RUN_MAX);
448
449 if (entry == entry_map_end) {
450 mutex_exit(sm->sm_lock);
451 dmu_write(os, smo->smo_object, smo->smo_objsize,
452 bufsize, entry_map, tx);
453 mutex_enter(sm->sm_lock);
454 smo->smo_objsize += bufsize;
455 entry = entry_map;
456 }
457
458 *entry++ = SM_OFFSET_ENCODE(start) |
459 SM_TYPE_ENCODE(maptype) |
460 SM_RUN_ENCODE(run_len);
461
462 start += run_len;
463 size -= run_len;
464 }
465 kmem_free(ss, sizeof (*ss));
466 }
467
468 if (entry != entry_map) {
469 size = (entry - entry_map) * sizeof (uint64_t);
470 mutex_exit(sm->sm_lock);
471 dmu_write(os, smo->smo_object, smo->smo_objsize,
472 size, entry_map, tx);
473 mutex_enter(sm->sm_lock);
474 smo->smo_objsize += size;
475 }
476
477 zio_buf_free(entry_map, bufsize);
478
479 VERIFY3U(sm->sm_space, ==, 0);
480}
481
482void
483space_map_truncate(space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx)
484{
485 VERIFY(dmu_free_range(os, smo->smo_object, 0, -1ULL, tx) == 0);
486
487 smo->smo_objsize = 0;
488 smo->smo_alloc = 0;
489}
490
491/*
492 * Space map reference trees.
493 *
494 * A space map is a collection of integers. Every integer is either
495 * in the map, or it's not. A space map reference tree generalizes
496 * the idea: it allows its members to have arbitrary reference counts,
497 * as opposed to the implicit reference count of 0 or 1 in a space map.
498 * This representation comes in handy when computing the union or
499 * intersection of multiple space maps. For example, the union of
500 * N space maps is the subset of the reference tree with refcnt >= 1.
501 * The intersection of N space maps is the subset with refcnt >= N.
502 *
503 * [It's very much like a Fourier transform. Unions and intersections
504 * are hard to perform in the 'space map domain', so we convert the maps
505 * into the 'reference count domain', where it's trivial, then invert.]
506 *
507 * vdev_dtl_reassess() uses computations of this form to determine
508 * DTL_MISSING and DTL_OUTAGE for interior vdevs -- e.g. a RAID-Z vdev
509 * has an outage wherever refcnt >= vdev_nparity + 1, and a mirror vdev
510 * has an outage wherever refcnt >= vdev_children.
511 */
512static int
513space_map_ref_compare(const void *x1, const void *x2)
514{
515 const space_ref_t *sr1 = x1;
516 const space_ref_t *sr2 = x2;
517
518 if (sr1->sr_offset < sr2->sr_offset)
519 return (-1);
520 if (sr1->sr_offset > sr2->sr_offset)
521 return (1);
522
523 if (sr1 < sr2)
524 return (-1);
525 if (sr1 > sr2)
526 return (1);
527
528 return (0);
529}
530
531void
532space_map_ref_create(avl_tree_t *t)
533{
534 avl_create(t, space_map_ref_compare,
535 sizeof (space_ref_t), offsetof(space_ref_t, sr_node));
536}
537
538void
539space_map_ref_destroy(avl_tree_t *t)
540{
541 space_ref_t *sr;
542 void *cookie = NULL;
543
544 while ((sr = avl_destroy_nodes(t, &cookie)) != NULL)
545 kmem_free(sr, sizeof (*sr));
546
547 avl_destroy(t);
548}
549
550static void
551space_map_ref_add_node(avl_tree_t *t, uint64_t offset, int64_t refcnt)
552{
553 space_ref_t *sr;
554
555 sr = kmem_alloc(sizeof (*sr), KM_SLEEP);
556 sr->sr_offset = offset;
557 sr->sr_refcnt = refcnt;
558
559 avl_add(t, sr);
560}
561
562void
563space_map_ref_add_seg(avl_tree_t *t, uint64_t start, uint64_t end,
564 int64_t refcnt)
565{
566 space_map_ref_add_node(t, start, refcnt);
567 space_map_ref_add_node(t, end, -refcnt);
568}
569
570/*
571 * Convert (or add) a space map into a reference tree.
572 */
573void
574space_map_ref_add_map(avl_tree_t *t, space_map_t *sm, int64_t refcnt)
575{
576 space_seg_t *ss;
577
578 ASSERT(MUTEX_HELD(sm->sm_lock));
579
580 for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss))
581 space_map_ref_add_seg(t, ss->ss_start, ss->ss_end, refcnt);
582}
583
584/*
585 * Convert a reference tree into a space map. The space map will contain
586 * all members of the reference tree for which refcnt >= minref.
587 */
588void
589space_map_ref_generate_map(avl_tree_t *t, space_map_t *sm, int64_t minref)
590{
591 uint64_t start = -1ULL;
592 int64_t refcnt = 0;
593 space_ref_t *sr;
594
595 ASSERT(MUTEX_HELD(sm->sm_lock));
596
597 space_map_vacate(sm, NULL, NULL);
598
599 for (sr = avl_first(t); sr != NULL; sr = AVL_NEXT(t, sr)) {
600 refcnt += sr->sr_refcnt;
601 if (refcnt >= minref) {
602 if (start == -1ULL) {
603 start = sr->sr_offset;
604 }
605 } else {
606 if (start != -1ULL) {
607 uint64_t end = sr->sr_offset;
608 ASSERT(start <= end);
609 if (end > start)
610 space_map_add(sm, start, end - start);
611 start = -1ULL;
612 }
613 }
614 }
615 ASSERT(refcnt == 0);
616 ASSERT(start == -1ULL);
617}
|