Print this page
6267 dn_bonus evicted too early
Reviewed by: Richard Yao <ryao@gentoo.org>
Reviewed by: Xin LI <delphij@freebsd.org>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
| Split |
Close |
| Expand all |
| Collapse all |
--- old/usr/src/uts/common/fs/zfs/sys/dbuf.h
+++ new/usr/src/uts/common/fs/zfs/sys/dbuf.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 26 */
27 27
28 28 #ifndef _SYS_DBUF_H
29 29 #define _SYS_DBUF_H
30 30
31 31 #include <sys/dmu.h>
32 32 #include <sys/spa.h>
33 33 #include <sys/txg.h>
34 34 #include <sys/zio.h>
35 35 #include <sys/arc.h>
36 36 #include <sys/zfs_context.h>
37 37 #include <sys/refcount.h>
38 38 #include <sys/zrlock.h>
39 39
40 40 #ifdef __cplusplus
41 41 extern "C" {
42 42 #endif
43 43
44 44 #define IN_DMU_SYNC 2
45 45
46 46 /*
47 47 * define flags for dbuf_read
48 48 */
49 49
50 50 #define DB_RF_MUST_SUCCEED (1 << 0)
51 51 #define DB_RF_CANFAIL (1 << 1)
52 52 #define DB_RF_HAVESTRUCT (1 << 2)
53 53 #define DB_RF_NOPREFETCH (1 << 3)
54 54 #define DB_RF_NEVERWAIT (1 << 4)
55 55 #define DB_RF_CACHED (1 << 5)
56 56
57 57 /*
58 58 * The simplified state transition diagram for dbufs looks like:
59 59 *
60 60 * +----> READ ----+
61 61 * | |
62 62 * | V
63 63 * (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
64 64 * | ^ ^
65 65 * | | |
66 66 * +----> FILL ----+ |
67 67 * | |
68 68 * | |
69 69 * +--------> NOFILL -------+
70 70 *
71 71 * DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
72 72 * to find all dbufs in a range of a dnode and must be less than any other
73 73 * dbuf_states_t (see comment on dn_dbufs in dnode.h).
74 74 */
75 75 typedef enum dbuf_states {
76 76 DB_SEARCH = -1,
77 77 DB_UNCACHED,
78 78 DB_FILL,
79 79 DB_NOFILL,
80 80 DB_READ,
81 81 DB_CACHED,
82 82 DB_EVICTING
83 83 } dbuf_states_t;
84 84
85 85 struct dnode;
86 86 struct dmu_tx;
87 87
88 88 /*
89 89 * level = 0 means the user data
90 90 * level = 1 means the single indirect block
91 91 * etc.
92 92 */
93 93
94 94 struct dmu_buf_impl;
95 95
96 96 typedef enum override_states {
97 97 DR_NOT_OVERRIDDEN,
98 98 DR_IN_DMU_SYNC,
99 99 DR_OVERRIDDEN
100 100 } override_states_t;
101 101
102 102 typedef struct dbuf_dirty_record {
103 103 /* link on our parents dirty list */
104 104 list_node_t dr_dirty_node;
105 105
106 106 /* transaction group this data will sync in */
107 107 uint64_t dr_txg;
108 108
109 109 /* zio of outstanding write IO */
110 110 zio_t *dr_zio;
111 111
112 112 /* pointer back to our dbuf */
113 113 struct dmu_buf_impl *dr_dbuf;
114 114
115 115 /* pointer to next dirty record */
116 116 struct dbuf_dirty_record *dr_next;
117 117
118 118 /* pointer to parent dirty record */
119 119 struct dbuf_dirty_record *dr_parent;
120 120
121 121 /* How much space was changed to dsl_pool_dirty_space() for this? */
122 122 unsigned int dr_accounted;
123 123
124 124 /* A copy of the bp that points to us */
125 125 blkptr_t dr_bp_copy;
126 126
127 127 union dirty_types {
128 128 struct dirty_indirect {
129 129
130 130 /* protect access to list */
131 131 kmutex_t dr_mtx;
132 132
133 133 /* Our list of dirty children */
134 134 list_t dr_children;
135 135 } di;
136 136 struct dirty_leaf {
137 137
138 138 /*
139 139 * dr_data is set when we dirty the buffer
140 140 * so that we can retain the pointer even if it
141 141 * gets COW'd in a subsequent transaction group.
142 142 */
143 143 arc_buf_t *dr_data;
144 144 blkptr_t dr_overridden_by;
145 145 override_states_t dr_override_state;
146 146 uint8_t dr_copies;
147 147 boolean_t dr_nopwrite;
148 148 } dl;
149 149 } dt;
150 150 } dbuf_dirty_record_t;
151 151
152 152 typedef struct dmu_buf_impl {
153 153 /*
154 154 * The following members are immutable, with the exception of
155 155 * db.db_data, which is protected by db_mtx.
156 156 */
157 157
158 158 /* the publicly visible structure */
159 159 dmu_buf_t db;
160 160
161 161 /* the objset we belong to */
162 162 struct objset *db_objset;
163 163
164 164 /*
165 165 * handle to safely access the dnode we belong to (NULL when evicted)
166 166 */
167 167 struct dnode_handle *db_dnode_handle;
168 168
169 169 /*
170 170 * our parent buffer; if the dnode points to us directly,
171 171 * db_parent == db_dnode_handle->dnh_dnode->dn_dbuf
172 172 * only accessed by sync thread ???
173 173 * (NULL when evicted)
174 174 * May change from NULL to non-NULL under the protection of db_mtx
175 175 * (see dbuf_check_blkptr())
176 176 */
177 177 struct dmu_buf_impl *db_parent;
178 178
179 179 /*
180 180 * link for hash table of all dmu_buf_impl_t's
181 181 */
182 182 struct dmu_buf_impl *db_hash_next;
183 183
184 184 /* our block number */
185 185 uint64_t db_blkid;
186 186
187 187 /*
188 188 * Pointer to the blkptr_t which points to us. May be NULL if we
189 189 * don't have one yet. (NULL when evicted)
190 190 */
191 191 blkptr_t *db_blkptr;
192 192
193 193 /*
194 194 * Our indirection level. Data buffers have db_level==0.
195 195 * Indirect buffers which point to data buffers have
196 196 * db_level==1. etc. Buffers which contain dnodes have
197 197 * db_level==0, since the dnodes are stored in a file.
198 198 */
199 199 uint8_t db_level;
200 200
201 201 /* db_mtx protects the members below */
202 202 kmutex_t db_mtx;
203 203
204 204 /*
205 205 * Current state of the buffer
206 206 */
207 207 dbuf_states_t db_state;
208 208
209 209 /*
210 210 * Refcount accessed by dmu_buf_{hold,rele}.
211 211 * If nonzero, the buffer can't be destroyed.
212 212 * Protected by db_mtx.
213 213 */
214 214 refcount_t db_holds;
215 215
216 216 /* buffer holding our data */
217 217 arc_buf_t *db_buf;
218 218
219 219 kcondvar_t db_changed;
220 220 dbuf_dirty_record_t *db_data_pending;
221 221
222 222 /* pointer to most recent dirty record for this buffer */
223 223 dbuf_dirty_record_t *db_last_dirty;
224 224
225 225 /*
|
↓ open down ↓ |
225 lines elided |
↑ open up ↑ |
226 226 * Our link on the owner dnodes's dn_dbufs list.
227 227 * Protected by its dn_dbufs_mtx.
228 228 */
229 229 avl_node_t db_link;
230 230
231 231 /* Data which is unique to data (leaf) blocks: */
232 232
233 233 /* User callback information. */
234 234 dmu_buf_user_t *db_user;
235 235
236 - uint8_t db_immediate_evict;
236 + /*
237 + * Evict user data as soon as the dirty and reference
238 + * counts are equal.
239 + */
240 + uint8_t db_user_immediate_evict;
241 +
242 + /*
243 + * This block was freed while a read or write was
244 + * active.
245 + */
237 246 uint8_t db_freed_in_flight;
238 247
248 + /*
249 + * dnode_evict_dbufs() or dnode_evict_bonus() tried to
250 + * evict this dbuf, but couldn't due to outstanding
251 + * references. Evict once the refcount drops to 0.
252 + */
253 + uint8_t db_pending_evict;
254 +
239 255 uint8_t db_dirtycnt;
240 256 } dmu_buf_impl_t;
241 257
242 258 /* Note: the dbuf hash table is exposed only for the mdb module */
243 259 #define DBUF_MUTEXES 256
244 260 #define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
245 261 typedef struct dbuf_hash_table {
246 262 uint64_t hash_table_mask;
247 263 dmu_buf_impl_t **hash_table;
248 264 kmutex_t hash_mutexes[DBUF_MUTEXES];
249 265 } dbuf_hash_table_t;
250 266
251 267
252 268 uint64_t dbuf_whichblock(struct dnode *di, uint64_t offset);
253 269
254 270 dmu_buf_impl_t *dbuf_create_tlib(struct dnode *dn, char *data);
255 271 void dbuf_create_bonus(struct dnode *dn);
256 272 int dbuf_spill_set_blksz(dmu_buf_t *db, uint64_t blksz, dmu_tx_t *tx);
257 273 void dbuf_spill_hold(struct dnode *dn, dmu_buf_impl_t **dbp, void *tag);
258 274
259 275 void dbuf_rm_spill(struct dnode *dn, dmu_tx_t *tx);
260 276
261 277 dmu_buf_impl_t *dbuf_hold(struct dnode *dn, uint64_t blkid, void *tag);
262 278 dmu_buf_impl_t *dbuf_hold_level(struct dnode *dn, int level, uint64_t blkid,
263 279 void *tag);
264 280 int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid, int create,
265 281 void *tag, dmu_buf_impl_t **dbp);
266 282
267 283 void dbuf_prefetch(struct dnode *dn, uint64_t blkid, zio_priority_t prio);
268 284
269 285 void dbuf_add_ref(dmu_buf_impl_t *db, void *tag);
270 286 boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj,
271 287 uint64_t blkid, void *tag);
272 288 uint64_t dbuf_refcount(dmu_buf_impl_t *db);
273 289
274 290 void dbuf_rele(dmu_buf_impl_t *db, void *tag);
275 291 void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag);
276 292
277 293 dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
278 294 uint64_t blkid);
279 295
280 296 int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
281 297 void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
282 298 void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx);
283 299 void dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx);
284 300 void dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx);
285 301 dbuf_dirty_record_t *dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
286 302 arc_buf_t *dbuf_loan_arcbuf(dmu_buf_impl_t *db);
287 303 void dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
288 304 bp_embedded_type_t etype, enum zio_compress comp,
289 305 int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);
290 306
291 307 void dbuf_clear(dmu_buf_impl_t *db);
292 308 void dbuf_evict(dmu_buf_impl_t *db);
293 309
294 310 void dbuf_setdirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
295 311 void dbuf_unoverride(dbuf_dirty_record_t *dr);
296 312 void dbuf_sync_list(list_t *list, dmu_tx_t *tx);
297 313 void dbuf_release_bp(dmu_buf_impl_t *db);
298 314
299 315 void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
300 316 struct dmu_tx *);
301 317
302 318 void dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx);
303 319
304 320 #define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
305 321 #define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
306 322 #define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))
307 323 #define DB_DNODE_EXIT(_db) (zrl_remove(&DB_DNODE_LOCK(_db)))
308 324 #define DB_DNODE_HELD(_db) (!zrl_is_zero(&DB_DNODE_LOCK(_db)))
309 325
310 326 void dbuf_init(void);
311 327 void dbuf_fini(void);
312 328
313 329 boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);
314 330
315 331 #define DBUF_GET_BUFC_TYPE(_db) \
316 332 (dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
317 333
318 334 #define DBUF_IS_CACHEABLE(_db) \
319 335 ((_db)->db_objset->os_primary_cache == ZFS_CACHE_ALL || \
320 336 (dbuf_is_metadata(_db) && \
321 337 ((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))
322 338
323 339 #define DBUF_IS_L2CACHEABLE(_db) \
324 340 ((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL || \
325 341 (dbuf_is_metadata(_db) && \
326 342 ((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
327 343
328 344 #define DBUF_IS_L2COMPRESSIBLE(_db) \
329 345 ((_db)->db_objset->os_compress != ZIO_COMPRESS_OFF || \
330 346 (dbuf_is_metadata(_db) && zfs_mdcomp_disable == B_FALSE))
331 347
332 348 #ifdef ZFS_DEBUG
333 349
334 350 /*
335 351 * There should be a ## between the string literal and fmt, to make it
336 352 * clear that we're joining two strings together, but gcc does not
337 353 * support that preprocessor token.
338 354 */
339 355 #define dprintf_dbuf(dbuf, fmt, ...) do { \
340 356 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
341 357 char __db_buf[32]; \
342 358 uint64_t __db_obj = (dbuf)->db.db_object; \
343 359 if (__db_obj == DMU_META_DNODE_OBJECT) \
344 360 (void) strcpy(__db_buf, "mdn"); \
345 361 else \
346 362 (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
347 363 (u_longlong_t)__db_obj); \
348 364 dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
349 365 "obj=%s lvl=%u blkid=%lld " fmt, \
350 366 __db_buf, (dbuf)->db_level, \
351 367 (u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
352 368 } \
353 369 _NOTE(CONSTCOND) } while (0)
354 370
355 371 #define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
356 372 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
357 373 char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
358 374 snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp); \
359 375 dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
360 376 kmem_free(__blkbuf, BP_SPRINTF_LEN); \
361 377 } \
362 378 _NOTE(CONSTCOND) } while (0)
363 379
364 380 #define DBUF_VERIFY(db) dbuf_verify(db)
365 381
366 382 #else
367 383
368 384 #define dprintf_dbuf(db, fmt, ...)
369 385 #define dprintf_dbuf_bp(db, bp, fmt, ...)
370 386 #define DBUF_VERIFY(db)
371 387
372 388 #endif
373 389
374 390
375 391 #ifdef __cplusplus
376 392 }
377 393 #endif
378 394
379 395 #endif /* _SYS_DBUF_H */
|
↓ open down ↓ |
131 lines elided |
↑ open up ↑ |
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX