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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
28 #include <sys/zfs_context.h>
33 #include <sys/refcount.h>
34 #include <sys/dmu_zfetch.h>
35 #include <sys/zrlock.h>
44 #define DNODE_MUST_BE_ALLOCATED 1
45 #define DNODE_MUST_BE_FREE 2
48 * dnode_next_offset() flags.
50 #define DNODE_FIND_HOLE 1
51 #define DNODE_FIND_BACKWARDS 2
52 #define DNODE_FIND_HAVELOCK 4
57 #define DNODE_SHIFT 9 /* 512 bytes */
58 #define DN_MIN_INDBLKSHIFT 10 /* 1k */
59 #define DN_MAX_INDBLKSHIFT 14 /* 16k */
60 #define DNODE_BLOCK_SHIFT 14 /* 16k */
61 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
62 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
63 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
68 * Note: a file will never ever have its
69 * ids moved from bonus->spill
70 * and only in a crypto environment would it be on spill
72 #define DN_ID_CHKED_BONUS 0x1
73 #define DN_ID_CHKED_SPILL 0x2
74 #define DN_ID_OLD_EXIST 0x4
75 #define DN_ID_NEW_EXIST 0x8
80 #define DNODE_SIZE (1 << DNODE_SHIFT)
81 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
82 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
83 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
84 #define DN_ZERO_BONUSLEN (DN_MAX_BONUSLEN + 1)
85 #define DN_KILL_SPILLBLK (1)
87 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
88 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
89 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
90 #define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT)
92 /* The +2 here is a cheesy way to round up */
93 #define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
94 (DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
96 #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
97 (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
99 #define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
100 (dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)
102 #define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))
108 enum dnode_dirtycontext
{
114 /* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
115 #define DNODE_FLAG_USED_BYTES (1<<0)
116 #define DNODE_FLAG_USERUSED_ACCOUNTED (1<<1)
118 /* Does dnode have a SA spill blkptr in bonus? */
119 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
121 typedef struct dnode_phys
{
122 uint8_t dn_type
; /* dmu_object_type_t */
123 uint8_t dn_indblkshift
; /* ln2(indirect block size) */
124 uint8_t dn_nlevels
; /* 1=dn_blkptr->data blocks */
125 uint8_t dn_nblkptr
; /* length of dn_blkptr */
126 uint8_t dn_bonustype
; /* type of data in bonus buffer */
127 uint8_t dn_checksum
; /* ZIO_CHECKSUM type */
128 uint8_t dn_compress
; /* ZIO_COMPRESS type */
129 uint8_t dn_flags
; /* DNODE_FLAG_* */
130 uint16_t dn_datablkszsec
; /* data block size in 512b sectors */
131 uint16_t dn_bonuslen
; /* length of dn_bonus */
134 /* accounting is protected by dn_dirty_mtx */
135 uint64_t dn_maxblkid
; /* largest allocated block ID */
136 uint64_t dn_used
; /* bytes (or sectors) of disk space */
140 blkptr_t dn_blkptr
[1];
141 uint8_t dn_bonus
[DN_MAX_BONUSLEN
- sizeof (blkptr_t
)];
145 typedef struct dnode
{
147 * dn_struct_rwlock protects the structure of the dnode,
148 * including the number of levels of indirection (dn_nlevels),
149 * dn_maxblkid, and dn_next_*
151 krwlock_t dn_struct_rwlock
;
153 /* Our link on dn_objset->os_dnodes list; protected by os_lock. */
157 struct objset
*dn_objset
;
159 struct dmu_buf_impl
*dn_dbuf
;
160 struct dnode_handle
*dn_handle
;
161 dnode_phys_t
*dn_phys
; /* pointer into dn->dn_dbuf->db.db_data */
164 * Copies of stuff in dn_phys. They're valid in the open
165 * context (eg. even before the dnode is first synced).
166 * Where necessary, these are protected by dn_struct_rwlock.
168 dmu_object_type_t dn_type
; /* object type */
169 uint16_t dn_bonuslen
; /* bonus length */
170 uint8_t dn_bonustype
; /* bonus type */
171 uint8_t dn_nblkptr
; /* number of blkptrs (immutable) */
172 uint8_t dn_checksum
; /* ZIO_CHECKSUM type */
173 uint8_t dn_compress
; /* ZIO_COMPRESS type */
175 uint8_t dn_indblkshift
;
176 uint8_t dn_datablkshift
; /* zero if blksz not power of 2! */
177 uint8_t dn_moved
; /* Has this dnode been moved? */
178 uint16_t dn_datablkszsec
; /* in 512b sectors */
179 uint32_t dn_datablksz
; /* in bytes */
180 uint64_t dn_maxblkid
;
181 uint8_t dn_next_nblkptr
[TXG_SIZE
];
182 uint8_t dn_next_nlevels
[TXG_SIZE
];
183 uint8_t dn_next_indblkshift
[TXG_SIZE
];
184 uint8_t dn_next_bonustype
[TXG_SIZE
];
185 uint8_t dn_rm_spillblk
[TXG_SIZE
]; /* for removing spill blk */
186 uint16_t dn_next_bonuslen
[TXG_SIZE
];
187 uint32_t dn_next_blksz
[TXG_SIZE
]; /* next block size in bytes */
189 /* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */
190 uint32_t dn_dbufs_count
; /* count of dn_dbufs */
192 /* protected by os_lock: */
193 list_node_t dn_dirty_link
[TXG_SIZE
]; /* next on dataset's dirty */
195 /* protected by dn_mtx: */
197 list_t dn_dirty_records
[TXG_SIZE
];
198 avl_tree_t dn_ranges
[TXG_SIZE
];
199 uint64_t dn_allocated_txg
;
200 uint64_t dn_free_txg
;
201 uint64_t dn_assigned_txg
;
202 kcondvar_t dn_notxholds
;
203 enum dnode_dirtycontext dn_dirtyctx
;
204 uint8_t *dn_dirtyctx_firstset
; /* dbg: contents meaningless */
206 /* protected by own devices */
207 refcount_t dn_tx_holds
;
210 kmutex_t dn_dbufs_mtx
;
211 list_t dn_dbufs
; /* descendent dbufs */
213 /* protected by dn_struct_rwlock */
214 struct dmu_buf_impl
*dn_bonus
; /* bonus buffer dbuf */
216 boolean_t dn_have_spill
; /* have spill or are spilling */
218 /* parent IO for current sync write */
221 /* used in syncing context */
222 uint64_t dn_oldused
; /* old phys used bytes */
223 uint64_t dn_oldflags
; /* old phys dn_flags */
224 uint64_t dn_olduid
, dn_oldgid
;
225 uint64_t dn_newuid
, dn_newgid
;
228 /* holds prefetch structure */
229 struct zfetch dn_zfetch
;
233 * Adds a level of indirection between the dbuf and the dnode to avoid
234 * iterating descendent dbufs in dnode_move(). Handles are not allocated
235 * individually, but as an array of child dnodes in dnode_hold_impl().
237 typedef struct dnode_handle
{
238 /* Protects dnh_dnode from modification by dnode_move(). */
243 typedef struct dnode_children
{
244 size_t dnc_count
; /* number of children */
245 dnode_handle_t dnc_children
[1]; /* sized dynamically */
248 typedef struct free_range
{
254 dnode_t
*dnode_special_open(struct objset
*dd
, dnode_phys_t
*dnp
,
255 uint64_t object
, dnode_handle_t
*dnh
);
256 void dnode_special_close(dnode_handle_t
*dnh
);
258 void dnode_setbonuslen(dnode_t
*dn
, int newsize
, dmu_tx_t
*tx
);
259 void dnode_setbonus_type(dnode_t
*dn
, dmu_object_type_t
, dmu_tx_t
*tx
);
260 void dnode_rm_spill(dnode_t
*dn
, dmu_tx_t
*tx
);
262 int dnode_hold(struct objset
*dd
, uint64_t object
,
263 void *ref
, dnode_t
**dnp
);
264 int dnode_hold_impl(struct objset
*dd
, uint64_t object
, int flag
,
265 void *ref
, dnode_t
**dnp
);
266 boolean_t
dnode_add_ref(dnode_t
*dn
, void *ref
);
267 void dnode_rele(dnode_t
*dn
, void *ref
);
268 void dnode_setdirty(dnode_t
*dn
, dmu_tx_t
*tx
);
269 void dnode_sync(dnode_t
*dn
, dmu_tx_t
*tx
);
270 void dnode_allocate(dnode_t
*dn
, dmu_object_type_t ot
, int blocksize
, int ibs
,
271 dmu_object_type_t bonustype
, int bonuslen
, dmu_tx_t
*tx
);
272 void dnode_reallocate(dnode_t
*dn
, dmu_object_type_t ot
, int blocksize
,
273 dmu_object_type_t bonustype
, int bonuslen
, dmu_tx_t
*tx
);
274 void dnode_free(dnode_t
*dn
, dmu_tx_t
*tx
);
275 void dnode_byteswap(dnode_phys_t
*dnp
);
276 void dnode_buf_byteswap(void *buf
, size_t size
);
277 void dnode_verify(dnode_t
*dn
);
278 int dnode_set_blksz(dnode_t
*dn
, uint64_t size
, int ibs
, dmu_tx_t
*tx
);
279 uint64_t dnode_current_max_length(dnode_t
*dn
);
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
);
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.
300 #define dprintf_dnode(dn, fmt, ...) do { \
301 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
303 uint64_t __db_obj = (dn)->dn_object; \
304 if (__db_obj == DMU_META_DNODE_OBJECT) \
305 (void) strcpy(__db_buf, "mdn"); \
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__); \
312 _NOTE(CONSTCOND) } while (0)
314 #define DNODE_VERIFY(dn) dnode_verify(dn)
315 #define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx)
319 #define dprintf_dnode(db, fmt, ...)
320 #define DNODE_VERIFY(dn)
321 #define FREE_VERIFY(db, start, end, tx)
329 #endif /* _SYS_DNODE_H */