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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 */
25
26 #ifndef _SYS_DNODE_H
27 #define _SYS_DNODE_H
28
29 #include <sys/zfs_context.h>
30 #include <sys/avl.h>
31 #include <sys/spa.h>
32 #include <sys/txg.h>
33 #include <sys/zio.h>
34 #include <sys/refcount.h>
35 #include <sys/dmu_zfetch.h>
36 #include <sys/zrlock.h>
37
38 #ifdef __cplusplus
39 extern "C" {
40 #endif
41
42 /*
43 * dnode_hold() flags.
44 */
45 #define DNODE_MUST_BE_ALLOCATED 1
46 #define DNODE_MUST_BE_FREE 2
47
48 /*
49 * dnode_next_offset() flags.
50 */
51 #define DNODE_FIND_HOLE 1
52 #define DNODE_FIND_BACKWARDS 2
53 #define DNODE_FIND_HAVELOCK 4
54
55 /*
56 * Fixed constants.
57 */
58 #define DNODE_SHIFT 9 /* 512 bytes */
59 #define DN_MIN_INDBLKSHIFT 10 /* 1k */
60 #define DN_MAX_INDBLKSHIFT 14 /* 16k */
61 #define DNODE_BLOCK_SHIFT 14 /* 16k */
62 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
63 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
64 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
65
66 /*
67 * dnode id flags
68 *
69 * Note: a file will never ever have its
70 * ids moved from bonus->spill
71 * and only in a crypto environment would it be on spill
72 */
73 #define DN_ID_CHKED_BONUS 0x1
74 #define DN_ID_CHKED_SPILL 0x2
75 #define DN_ID_OLD_EXIST 0x4
76 #define DN_ID_NEW_EXIST 0x8
77
78 /*
79 * Derived constants.
80 */
81 #define DNODE_SIZE (1 << DNODE_SHIFT)
82 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
83 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
84 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
85 #define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1)
86 #define DN_KILL_SPILLBLK (1)
87
88 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
89 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
90 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
91 #define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT)
92
93 /* The +2 here is a cheesy way to round up */
94 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
95 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
96
97 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
98 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
99
100 #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
101 (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)
102
103 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))
104
105 struct dmu_buf_impl;
106 struct objset;
107 struct zio;
108
109 enum dnode_dirtycontext {
110 DN_UNDIRTIED,
111 DN_DIRTY_OPEN,
112 DN_DIRTY_SYNC
113 };
114
115 /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
116 #define DNODE_FLAG_USED_BYTES (1<<0)
117 #define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1)
118
119 /* Does dnode have a SA spill blkptr in bonus? */
120 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
121
122 typedef struct dnode_phys {
123 uint8_t dn_type; /* dmu_object_type_t */
124 uint8_t dn_indblkshift; /* ln2(indirect block size) */
125 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
126 uint8_t dn_nblkptr; /* length of dn_blkptr */
127 uint8_t dn_bonustype; /* type of data in bonus buffer */
128 uint8_t dn_checksum; /* ZIO_CHECKSUM type */
129 uint8_t dn_compress; /* ZIO_COMPRESS type */
130 uint8_t dn_flags; /* DNODE_FLAG_* */
131 uint16_t dn_datablkszsec; /* data block size in 512b sectors */
132 uint16_t dn_bonuslen; /* length of dn_bonus */
133 uint8_t dn_pad2[4];
134
135 /* accounting is protected by dn_dirty_mtx */
136 uint64_t dn_maxblkid; /* largest allocated block ID */
137 uint64_t dn_used; /* bytes (or sectors) of disk space */
138
139 uint64_t dn_pad3[4];
140
141 blkptr_t dn_blkptr[1];
142 uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
143 blkptr_t dn_spill;
144 } dnode_phys_t;
145
146 typedef struct dnode {
147 /*
148 * dn_struct_rwlock protects the structure of the dnode,
149 * including the number of levels of indirection (dn_nlevels),
150 * dn_maxblkid, and dn_next_*
151 */
152 krwlock_t dn_struct_rwlock;
153
154 /* Our link on dn_objset->os_dnodes list; protected by os_lock. */
155 list_node_t dn_link;
156
157 /* immutable: */
158 struct objset *dn_objset;
159 uint64_t dn_object;
160 struct dmu_buf_impl *dn_dbuf;
161 struct dnode_handle *dn_handle;
162 dnode_phys_t *dn_phys; /* pointer into dn->dn_dbuf->db.db_data */
163
164 /*
165 * Copies of stuff in dn_phys. They're valid in the open
166 * context (eg. even before the dnode is first synced).
167 * Where necessary, these are protected by dn_struct_rwlock.
168 */
169 dmu_object_type_t dn_type; /* object type */
170 uint16_t dn_bonuslen; /* bonus length */
171 uint8_t dn_bonustype; /* bonus type */
172 uint8_t dn_nblkptr; /* number of blkptrs (immutable) */
173 uint8_t dn_checksum; /* ZIO_CHECKSUM type */
174 uint8_t dn_compress; /* ZIO_COMPRESS type */
175 uint8_t dn_nlevels;
176 uint8_t dn_indblkshift;
177 uint8_t dn_datablkshift; /* zero if blksz not power of 2! */
178 uint8_t dn_moved; /* Has this dnode been moved? */
179 uint16_t dn_datablkszsec; /* in 512b sectors */
180 uint32_t dn_datablksz; /* in bytes */
181 uint64_t dn_maxblkid;
182 uint8_t dn_next_nblkptr[TXG_SIZE];
183 uint8_t dn_next_nlevels[TXG_SIZE];
184 uint8_t dn_next_indblkshift[TXG_SIZE];
185 uint8_t dn_next_bonustype[TXG_SIZE];
186 uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */
187 uint16_t dn_next_bonuslen[TXG_SIZE];
188 uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */
189
190 /* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */
191 uint32_t dn_dbufs_count; /* count of dn_dbufs */
192
193 /* protected by os_lock: */
194 list_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */
195
196 /* protected by dn_mtx: */
197 kmutex_t dn_mtx;
198 list_t dn_dirty_records[TXG_SIZE];
199 avl_tree_t dn_ranges[TXG_SIZE];
200 uint64_t dn_allocated_txg;
201 uint64_t dn_free_txg;
202 uint64_t dn_assigned_txg;
203 kcondvar_t dn_notxholds;
204 enum dnode_dirtycontext dn_dirtyctx;
205 uint8_t *dn_dirtyctx_firstset; /* dbg: contents meaningless */
206
207 /* protected by own devices */
208 refcount_t dn_tx_holds;
209 refcount_t dn_holds;
210
211 kmutex_t dn_dbufs_mtx;
212 list_t dn_dbufs; /* descendent dbufs */
213
214 /* protected by dn_struct_rwlock */
215 struct dmu_buf_impl *dn_bonus; /* bonus buffer dbuf */
216
217 boolean_t dn_have_spill; /* have spill or are spilling */
218
219 /* parent IO for current sync write */
220 zio_t *dn_zio;
221
222 /* used in syncing context */
223 uint64_t dn_oldused; /* old phys used bytes */
224 uint64_t dn_oldflags; /* old phys dn_flags */
225 uint64_t dn_olduid, dn_oldgid;
226 uint64_t dn_newuid, dn_newgid;
227 int dn_id_flags;
228
229 /* holds prefetch structure */
230 struct zfetch dn_zfetch;
231 } dnode_t;
232
233 /*
234 * Adds a level of indirection between the dbuf and the dnode to avoid
235 * iterating descendent dbufs in dnode_move(). Handles are not allocated
236 * individually, but as an array of child dnodes in dnode_hold_impl().
237 */
238 typedef struct dnode_handle {
239 /* Protects dnh_dnode from modification by dnode_move(). */
240 zrlock_t dnh_zrlock;
241 dnode_t *dnh_dnode;
242 } dnode_handle_t;
243
244 typedef struct dnode_children {
245 size_t dnc_count; /* number of children */
246 dnode_handle_t dnc_children[1]; /* sized dynamically */
247 } dnode_children_t;
248
249 typedef struct free_range {
250 avl_node_t fr_node;
251 uint64_t fr_blkid;
252 uint64_t fr_nblks;
253 } free_range_t;
254
255 dnode_t *dnode_special_open(struct objset *dd, dnode_phys_t *dnp,
256 uint64_t object, dnode_handle_t *dnh);
257 void dnode_special_close(dnode_handle_t *dnh);
258
259 void dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx);
260 void dnode_setbonus_type(dnode_t *dn, dmu_object_type_t, dmu_tx_t *tx);
261 void dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx);
262
263 int dnode_hold(struct objset *dd, uint64_t object,
264 void *ref, dnode_t **dnp);
265 int dnode_hold_impl(struct objset *dd, uint64_t object, int flag,
266 void *ref, dnode_t **dnp);
267 boolean_t dnode_add_ref(dnode_t *dn, void *ref);
268 void dnode_rele(dnode_t *dn, void *ref);
269 void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx);
270 void dnode_sync(dnode_t *dn, dmu_tx_t *tx);
271 void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
272 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
273 void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize,
274 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
275 void dnode_free(dnode_t *dn, dmu_tx_t *tx);
276 void dnode_byteswap(dnode_phys_t *dnp);
277 void dnode_buf_byteswap(void *buf, size_t size);
278 void dnode_verify(dnode_t *dn);
279 int dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx);
280 void dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx);
281 void dnode_clear_range(dnode_t *dn, uint64_t blkid,
282 uint64_t nblks, dmu_tx_t *tx);
283 void dnode_diduse_space(dnode_t *dn, int64_t space);
284 void dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx);
285 void dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t);
286 uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid);
287 void dnode_init(void);
288 void dnode_fini(void);
289 int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off,
290 int minlvl, uint64_t blkfill, uint64_t txg);
291 void dnode_evict_dbufs(dnode_t *dn);
292
293 #ifdef ZFS_DEBUG
294
295 /*
296 * There should be a ## between the string literal and fmt, to make it
297 * clear that we're joining two strings together, but that piece of shit
298 * gcc doesn't support that preprocessor token.
299 */
300 #define dprintf_dnode(dn, fmt, ...) do { \
301 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
302 char __db_buf[32]; \
303 uint64_t __db_obj = (dn)->dn_object; \
304 if (__db_obj == DMU_META_DNODE_OBJECT) \
305 (void) strcpy(__db_buf, "mdn"); \
306 else \
307 (void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
308 (u_longlong_t)__db_obj);\
309 dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \
310 __db_buf, __VA_ARGS__); \
311 } \
312 _NOTE(CONSTCOND) } while (0)
313
314 #define DNODE_VERIFY(dn) dnode_verify(dn)
315 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx)
316
317 #else
318
319 #define dprintf_dnode(db, fmt, ...)
320 #define DNODE_VERIFY(dn)
321 #define FREE_VERIFY(db, start, end, tx)
322
323 #endif
324
325 #ifdef __cplusplus
326 }
327 #endif
328
329 #endif /* _SYS_DNODE_H */