xref: /illumos-gate/usr/src/uts/common/fs/zfs/zap_micro.c (revision c5f9e43110e1fb316fc4297c2d150b3518b80bbe)
1fa9e4066Sahrens /*
2fa9e4066Sahrens  * CDDL HEADER START
3fa9e4066Sahrens  *
4fa9e4066Sahrens  * The contents of this file are subject to the terms of the
5f65e61c0Sahrens  * Common Development and Distribution License (the "License").
6f65e61c0Sahrens  * You may not use this file except in compliance with the License.
7fa9e4066Sahrens  *
8fa9e4066Sahrens  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens  * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens  * See the License for the specific language governing permissions
11fa9e4066Sahrens  * and limitations under the License.
12fa9e4066Sahrens  *
13fa9e4066Sahrens  * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens  * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens  * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens  * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens  *
19fa9e4066Sahrens  * CDDL HEADER END
20fa9e4066Sahrens  */
21fa9e4066Sahrens /*
22c25056deSgw  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23fa9e4066Sahrens  * Use is subject to license terms.
24fa9e4066Sahrens  */
25fa9e4066Sahrens 
26fa9e4066Sahrens #pragma ident	"%Z%%M%	%I%	%E% SMI"
27fa9e4066Sahrens 
28fa9e4066Sahrens #include <sys/spa.h>
29fa9e4066Sahrens #include <sys/dmu.h>
30fa9e4066Sahrens #include <sys/zfs_context.h>
31fa9e4066Sahrens #include <sys/zap.h>
32ea8dc4b6Seschrock #include <sys/refcount.h>
33fa9e4066Sahrens #include <sys/zap_impl.h>
3487e5029aSahrens #include <sys/zap_leaf.h>
35fa9e4066Sahrens #include <sys/avl.h>
36da6c28aaSamw #include <sys/zfs_i18n.h>
37fa9e4066Sahrens 
38fa9e4066Sahrens static void mzap_upgrade(zap_t *zap, dmu_tx_t *tx);
39fa9e4066Sahrens 
40fa9e4066Sahrens 
41da6c28aaSamw static uint64_t
42da6c28aaSamw zap_hash(zap_t *zap, const char *normname)
43da6c28aaSamw {
44da6c28aaSamw 	const uint8_t *cp;
45da6c28aaSamw 	uint8_t c;
46da6c28aaSamw 	uint64_t crc = zap->zap_salt;
47da6c28aaSamw 
48da6c28aaSamw 	/* NB: name must already be normalized, if necessary */
49da6c28aaSamw 
50da6c28aaSamw 	ASSERT(crc != 0);
51da6c28aaSamw 	ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
52da6c28aaSamw 	for (cp = (const uint8_t *)normname; (c = *cp) != '\0'; cp++) {
53da6c28aaSamw 		crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ c) & 0xFF];
54da6c28aaSamw 	}
55da6c28aaSamw 
56da6c28aaSamw 	/*
57da6c28aaSamw 	 * Only use 28 bits, since we need 4 bits in the cookie for the
58da6c28aaSamw 	 * collision differentiator.  We MUST use the high bits, since
59da6c28aaSamw 	 * those are the ones that we first pay attention to when
60da6c28aaSamw 	 * chosing the bucket.
61da6c28aaSamw 	 */
62da6c28aaSamw 	crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
63da6c28aaSamw 
64da6c28aaSamw 	return (crc);
65da6c28aaSamw }
66da6c28aaSamw 
67da6c28aaSamw static int
68da6c28aaSamw zap_normalize(zap_t *zap, const char *name, char *namenorm)
69da6c28aaSamw {
70da6c28aaSamw 	size_t inlen, outlen;
71da6c28aaSamw 	int err;
72da6c28aaSamw 
73da6c28aaSamw 	inlen = strlen(name) + 1;
74da6c28aaSamw 	outlen = ZAP_MAXNAMELEN;
75da6c28aaSamw 
76da6c28aaSamw 	err = 0;
77da6c28aaSamw 	(void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen,
78da6c28aaSamw 	    zap->zap_normflags | U8_TEXTPREP_IGNORE_NULL, U8_UNICODE_LATEST,
79da6c28aaSamw 	    &err);
80da6c28aaSamw 
81da6c28aaSamw 	return (err);
82da6c28aaSamw }
83da6c28aaSamw 
84da6c28aaSamw boolean_t
85da6c28aaSamw zap_match(zap_name_t *zn, const char *matchname)
86da6c28aaSamw {
87da6c28aaSamw 	if (zn->zn_matchtype == MT_FIRST) {
88da6c28aaSamw 		char norm[ZAP_MAXNAMELEN];
89da6c28aaSamw 
90da6c28aaSamw 		if (zap_normalize(zn->zn_zap, matchname, norm) != 0)
91da6c28aaSamw 			return (B_FALSE);
92da6c28aaSamw 
93da6c28aaSamw 		return (strcmp(zn->zn_name_norm, norm) == 0);
94da6c28aaSamw 	} else {
95da6c28aaSamw 		/* MT_BEST or MT_EXACT */
96da6c28aaSamw 		return (strcmp(zn->zn_name_orij, matchname) == 0);
97da6c28aaSamw 	}
98da6c28aaSamw }
99da6c28aaSamw 
100da6c28aaSamw void
101da6c28aaSamw zap_name_free(zap_name_t *zn)
102da6c28aaSamw {
103da6c28aaSamw 	kmem_free(zn, sizeof (zap_name_t));
104da6c28aaSamw }
105da6c28aaSamw 
106da6c28aaSamw /* XXX combine this with zap_lockdir()? */
107da6c28aaSamw zap_name_t *
108da6c28aaSamw zap_name_alloc(zap_t *zap, const char *name, matchtype_t mt)
109da6c28aaSamw {
110da6c28aaSamw 	zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP);
111da6c28aaSamw 
112da6c28aaSamw 	zn->zn_zap = zap;
113da6c28aaSamw 	zn->zn_name_orij = name;
114da6c28aaSamw 	zn->zn_matchtype = mt;
115da6c28aaSamw 	if (zap->zap_normflags) {
116da6c28aaSamw 		if (zap_normalize(zap, name, zn->zn_normbuf) != 0) {
117da6c28aaSamw 			zap_name_free(zn);
118da6c28aaSamw 			return (NULL);
119da6c28aaSamw 		}
120da6c28aaSamw 		zn->zn_name_norm = zn->zn_normbuf;
121da6c28aaSamw 	} else {
122da6c28aaSamw 		if (mt != MT_EXACT) {
123da6c28aaSamw 			zap_name_free(zn);
124da6c28aaSamw 			return (NULL);
125da6c28aaSamw 		}
126da6c28aaSamw 		zn->zn_name_norm = zn->zn_name_orij;
127da6c28aaSamw 	}
128da6c28aaSamw 
129da6c28aaSamw 	zn->zn_hash = zap_hash(zap, zn->zn_name_norm);
130da6c28aaSamw 	return (zn);
131da6c28aaSamw }
132da6c28aaSamw 
133fa9e4066Sahrens static void
134fa9e4066Sahrens mzap_byteswap(mzap_phys_t *buf, size_t size)
135fa9e4066Sahrens {
136fa9e4066Sahrens 	int i, max;
137fa9e4066Sahrens 	buf->mz_block_type = BSWAP_64(buf->mz_block_type);
138fa9e4066Sahrens 	buf->mz_salt = BSWAP_64(buf->mz_salt);
139fa9e4066Sahrens 	max = (size / MZAP_ENT_LEN) - 1;
140fa9e4066Sahrens 	for (i = 0; i < max; i++) {
141fa9e4066Sahrens 		buf->mz_chunk[i].mze_value =
142fa9e4066Sahrens 		    BSWAP_64(buf->mz_chunk[i].mze_value);
143fa9e4066Sahrens 		buf->mz_chunk[i].mze_cd =
144fa9e4066Sahrens 		    BSWAP_32(buf->mz_chunk[i].mze_cd);
145fa9e4066Sahrens 	}
146fa9e4066Sahrens }
147fa9e4066Sahrens 
148fa9e4066Sahrens void
149fa9e4066Sahrens zap_byteswap(void *buf, size_t size)
150fa9e4066Sahrens {
151fa9e4066Sahrens 	uint64_t block_type;
152fa9e4066Sahrens 
153fa9e4066Sahrens 	block_type = *(uint64_t *)buf;
154fa9e4066Sahrens 
1555ad82045Snd 	if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) {
156fa9e4066Sahrens 		/* ASSERT(magic == ZAP_LEAF_MAGIC); */
157fa9e4066Sahrens 		mzap_byteswap(buf, size);
1585ad82045Snd 	} else {
159fa9e4066Sahrens 		fzap_byteswap(buf, size);
160fa9e4066Sahrens 	}
161fa9e4066Sahrens }
162fa9e4066Sahrens 
163fa9e4066Sahrens static int
164fa9e4066Sahrens mze_compare(const void *arg1, const void *arg2)
165fa9e4066Sahrens {
166fa9e4066Sahrens 	const mzap_ent_t *mze1 = arg1;
167fa9e4066Sahrens 	const mzap_ent_t *mze2 = arg2;
168fa9e4066Sahrens 
169fa9e4066Sahrens 	if (mze1->mze_hash > mze2->mze_hash)
170fa9e4066Sahrens 		return (+1);
171fa9e4066Sahrens 	if (mze1->mze_hash < mze2->mze_hash)
172fa9e4066Sahrens 		return (-1);
173fa9e4066Sahrens 	if (mze1->mze_phys.mze_cd > mze2->mze_phys.mze_cd)
174fa9e4066Sahrens 		return (+1);
175fa9e4066Sahrens 	if (mze1->mze_phys.mze_cd < mze2->mze_phys.mze_cd)
176fa9e4066Sahrens 		return (-1);
177fa9e4066Sahrens 	return (0);
178fa9e4066Sahrens }
179fa9e4066Sahrens 
180fa9e4066Sahrens static void
181fa9e4066Sahrens mze_insert(zap_t *zap, int chunkid, uint64_t hash, mzap_ent_phys_t *mzep)
182fa9e4066Sahrens {
183fa9e4066Sahrens 	mzap_ent_t *mze;
184fa9e4066Sahrens 
185fa9e4066Sahrens 	ASSERT(zap->zap_ismicro);
186fa9e4066Sahrens 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
187fa9e4066Sahrens 	ASSERT(mzep->mze_cd < ZAP_MAXCD);
188fa9e4066Sahrens 
189fa9e4066Sahrens 	mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP);
190fa9e4066Sahrens 	mze->mze_chunkid = chunkid;
191fa9e4066Sahrens 	mze->mze_hash = hash;
192fa9e4066Sahrens 	mze->mze_phys = *mzep;
193fa9e4066Sahrens 	avl_add(&zap->zap_m.zap_avl, mze);
194fa9e4066Sahrens }
195fa9e4066Sahrens 
196fa9e4066Sahrens static mzap_ent_t *
197da6c28aaSamw mze_find(zap_name_t *zn)
198fa9e4066Sahrens {
199fa9e4066Sahrens 	mzap_ent_t mze_tofind;
200fa9e4066Sahrens 	mzap_ent_t *mze;
201fa9e4066Sahrens 	avl_index_t idx;
202da6c28aaSamw 	avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl;
203fa9e4066Sahrens 
204da6c28aaSamw 	ASSERT(zn->zn_zap->zap_ismicro);
205da6c28aaSamw 	ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock));
206fa9e4066Sahrens 
207da6c28aaSamw 	if (strlen(zn->zn_name_norm) >= sizeof (mze_tofind.mze_phys.mze_name))
208fa9e4066Sahrens 		return (NULL);
209fa9e4066Sahrens 
210da6c28aaSamw 	mze_tofind.mze_hash = zn->zn_hash;
211fa9e4066Sahrens 	mze_tofind.mze_phys.mze_cd = 0;
212fa9e4066Sahrens 
213da6c28aaSamw again:
214fa9e4066Sahrens 	mze = avl_find(avl, &mze_tofind, &idx);
215fa9e4066Sahrens 	if (mze == NULL)
216fa9e4066Sahrens 		mze = avl_nearest(avl, idx, AVL_AFTER);
217da6c28aaSamw 	for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) {
218da6c28aaSamw 		if (zap_match(zn, mze->mze_phys.mze_name))
219fa9e4066Sahrens 			return (mze);
220fa9e4066Sahrens 	}
221da6c28aaSamw 	if (zn->zn_matchtype == MT_BEST) {
222da6c28aaSamw 		zn->zn_matchtype = MT_FIRST;
223da6c28aaSamw 		goto again;
224da6c28aaSamw 	}
225fa9e4066Sahrens 	return (NULL);
226fa9e4066Sahrens }
227fa9e4066Sahrens 
228fa9e4066Sahrens static uint32_t
229fa9e4066Sahrens mze_find_unused_cd(zap_t *zap, uint64_t hash)
230fa9e4066Sahrens {
231fa9e4066Sahrens 	mzap_ent_t mze_tofind;
232fa9e4066Sahrens 	mzap_ent_t *mze;
233fa9e4066Sahrens 	avl_index_t idx;
234fa9e4066Sahrens 	avl_tree_t *avl = &zap->zap_m.zap_avl;
235fa9e4066Sahrens 	uint32_t cd;
236fa9e4066Sahrens 
237fa9e4066Sahrens 	ASSERT(zap->zap_ismicro);
238fa9e4066Sahrens 	ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
239fa9e4066Sahrens 
240fa9e4066Sahrens 	mze_tofind.mze_hash = hash;
241fa9e4066Sahrens 	mze_tofind.mze_phys.mze_cd = 0;
242fa9e4066Sahrens 
243fa9e4066Sahrens 	cd = 0;
244fa9e4066Sahrens 	for (mze = avl_find(avl, &mze_tofind, &idx);
245fa9e4066Sahrens 	    mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) {
246fa9e4066Sahrens 		if (mze->mze_phys.mze_cd != cd)
247fa9e4066Sahrens 			break;
248fa9e4066Sahrens 		cd++;
249fa9e4066Sahrens 	}
250fa9e4066Sahrens 
251fa9e4066Sahrens 	return (cd);
252fa9e4066Sahrens }
253fa9e4066Sahrens 
254fa9e4066Sahrens static void
255fa9e4066Sahrens mze_remove(zap_t *zap, mzap_ent_t *mze)
256fa9e4066Sahrens {
257fa9e4066Sahrens 	ASSERT(zap->zap_ismicro);
258fa9e4066Sahrens 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
259fa9e4066Sahrens 
260fa9e4066Sahrens 	avl_remove(&zap->zap_m.zap_avl, mze);
261fa9e4066Sahrens 	kmem_free(mze, sizeof (mzap_ent_t));
262fa9e4066Sahrens }
263fa9e4066Sahrens 
264fa9e4066Sahrens static void
265fa9e4066Sahrens mze_destroy(zap_t *zap)
266fa9e4066Sahrens {
267fa9e4066Sahrens 	mzap_ent_t *mze;
268fa9e4066Sahrens 	void *avlcookie = NULL;
269fa9e4066Sahrens 
270fa9e4066Sahrens 	while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie))
271fa9e4066Sahrens 		kmem_free(mze, sizeof (mzap_ent_t));
272fa9e4066Sahrens 	avl_destroy(&zap->zap_m.zap_avl);
273fa9e4066Sahrens }
274fa9e4066Sahrens 
275fa9e4066Sahrens static zap_t *
276fa9e4066Sahrens mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db)
277fa9e4066Sahrens {
278fa9e4066Sahrens 	zap_t *winner;
279fa9e4066Sahrens 	zap_t *zap;
280fa9e4066Sahrens 	int i;
281fa9e4066Sahrens 
282fa9e4066Sahrens 	ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
283fa9e4066Sahrens 
284fa9e4066Sahrens 	zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP);
285fa9e4066Sahrens 	rw_init(&zap->zap_rwlock, 0, 0, 0);
286fa9e4066Sahrens 	rw_enter(&zap->zap_rwlock, RW_WRITER);
287fa9e4066Sahrens 	zap->zap_objset = os;
288fa9e4066Sahrens 	zap->zap_object = obj;
289fa9e4066Sahrens 	zap->zap_dbuf = db;
290fa9e4066Sahrens 
291da6c28aaSamw 	if (*(uint64_t *)db->db_data != ZBT_MICRO) {
292fa9e4066Sahrens 		mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
293f65e61c0Sahrens 		zap->zap_f.zap_block_shift = highbit(db->db_size) - 1;
294fa9e4066Sahrens 	} else {
295fa9e4066Sahrens 		zap->zap_ismicro = TRUE;
296fa9e4066Sahrens 	}
297fa9e4066Sahrens 
298fa9e4066Sahrens 	/*
299fa9e4066Sahrens 	 * Make sure that zap_ismicro is set before we let others see
300fa9e4066Sahrens 	 * it, because zap_lockdir() checks zap_ismicro without the lock
301fa9e4066Sahrens 	 * held.
302fa9e4066Sahrens 	 */
303455d5089Sahrens 	winner = dmu_buf_set_user(db, zap, &zap->zap_m.zap_phys, zap_evict);
304fa9e4066Sahrens 
305fa9e4066Sahrens 	if (winner != NULL) {
306c25056deSgw 		rw_exit(&zap->zap_rwlock);
307c25056deSgw 		rw_destroy(&zap->zap_rwlock);
308c25056deSgw 		if (!zap->zap_ismicro)
309c25056deSgw 			mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
310fa9e4066Sahrens 		kmem_free(zap, sizeof (zap_t));
311fa9e4066Sahrens 		return (winner);
312fa9e4066Sahrens 	}
313fa9e4066Sahrens 
314fa9e4066Sahrens 	if (zap->zap_ismicro) {
315fa9e4066Sahrens 		zap->zap_salt = zap->zap_m.zap_phys->mz_salt;
316da6c28aaSamw 		zap->zap_normflags = zap->zap_m.zap_phys->mz_normflags;
317fa9e4066Sahrens 		zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1;
318fa9e4066Sahrens 		avl_create(&zap->zap_m.zap_avl, mze_compare,
319fa9e4066Sahrens 		    sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node));
320fa9e4066Sahrens 
321fa9e4066Sahrens 		for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
322fa9e4066Sahrens 			mzap_ent_phys_t *mze =
323fa9e4066Sahrens 			    &zap->zap_m.zap_phys->mz_chunk[i];
324fa9e4066Sahrens 			if (mze->mze_name[0]) {
325da6c28aaSamw 				zap_name_t *zn;
326da6c28aaSamw 
327fa9e4066Sahrens 				zap->zap_m.zap_num_entries++;
328da6c28aaSamw 				zn = zap_name_alloc(zap, mze->mze_name,
329da6c28aaSamw 				    MT_EXACT);
330da6c28aaSamw 				mze_insert(zap, i, zn->zn_hash, mze);
331da6c28aaSamw 				zap_name_free(zn);
332fa9e4066Sahrens 			}
333fa9e4066Sahrens 		}
334fa9e4066Sahrens 	} else {
335fa9e4066Sahrens 		zap->zap_salt = zap->zap_f.zap_phys->zap_salt;
336da6c28aaSamw 		zap->zap_normflags = zap->zap_f.zap_phys->zap_normflags;
337f65e61c0Sahrens 
338f65e61c0Sahrens 		ASSERT3U(sizeof (struct zap_leaf_header), ==,
339f65e61c0Sahrens 		    2*ZAP_LEAF_CHUNKSIZE);
340f65e61c0Sahrens 
341f65e61c0Sahrens 		/*
342f65e61c0Sahrens 		 * The embedded pointer table should not overlap the
343f65e61c0Sahrens 		 * other members.
344f65e61c0Sahrens 		 */
345f65e61c0Sahrens 		ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >,
346f65e61c0Sahrens 		    &zap->zap_f.zap_phys->zap_salt);
347f65e61c0Sahrens 
348f65e61c0Sahrens 		/*
349f65e61c0Sahrens 		 * The embedded pointer table should end at the end of
350f65e61c0Sahrens 		 * the block
351f65e61c0Sahrens 		 */
352f65e61c0Sahrens 		ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap,
353f65e61c0Sahrens 		    1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) -
354f65e61c0Sahrens 		    (uintptr_t)zap->zap_f.zap_phys, ==,
355f65e61c0Sahrens 		    zap->zap_dbuf->db_size);
356fa9e4066Sahrens 	}
357fa9e4066Sahrens 	rw_exit(&zap->zap_rwlock);
358fa9e4066Sahrens 	return (zap);
359fa9e4066Sahrens }
360fa9e4066Sahrens 
361fa9e4066Sahrens int
362fa9e4066Sahrens zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
363*c5f9e431Sahrens     krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp)
364fa9e4066Sahrens {
365fa9e4066Sahrens 	zap_t *zap;
366fa9e4066Sahrens 	dmu_buf_t *db;
367fa9e4066Sahrens 	krw_t lt;
368fa9e4066Sahrens 	int err;
369fa9e4066Sahrens 
370fa9e4066Sahrens 	*zapp = NULL;
371fa9e4066Sahrens 
372ea8dc4b6Seschrock 	err = dmu_buf_hold(os, obj, 0, NULL, &db);
373ea8dc4b6Seschrock 	if (err)
374ea8dc4b6Seschrock 		return (err);
375fa9e4066Sahrens 
376fa9e4066Sahrens #ifdef ZFS_DEBUG
377fa9e4066Sahrens 	{
378fa9e4066Sahrens 		dmu_object_info_t doi;
379fa9e4066Sahrens 		dmu_object_info_from_db(db, &doi);
380fa9e4066Sahrens 		ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
381fa9e4066Sahrens 	}
382fa9e4066Sahrens #endif
383fa9e4066Sahrens 
384fa9e4066Sahrens 	zap = dmu_buf_get_user(db);
385fa9e4066Sahrens 	if (zap == NULL)
386fa9e4066Sahrens 		zap = mzap_open(os, obj, db);
387fa9e4066Sahrens 
388fa9e4066Sahrens 	/*
389fa9e4066Sahrens 	 * We're checking zap_ismicro without the lock held, in order to
390fa9e4066Sahrens 	 * tell what type of lock we want.  Once we have some sort of
391fa9e4066Sahrens 	 * lock, see if it really is the right type.  In practice this
392fa9e4066Sahrens 	 * can only be different if it was upgraded from micro to fat,
393fa9e4066Sahrens 	 * and micro wanted WRITER but fat only needs READER.
394fa9e4066Sahrens 	 */
395fa9e4066Sahrens 	lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti;
396fa9e4066Sahrens 	rw_enter(&zap->zap_rwlock, lt);
397fa9e4066Sahrens 	if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) {
398fa9e4066Sahrens 		/* it was upgraded, now we only need reader */
399fa9e4066Sahrens 		ASSERT(lt == RW_WRITER);
400fa9e4066Sahrens 		ASSERT(RW_READER ==
401fa9e4066Sahrens 		    (!zap->zap_ismicro && fatreader) ? RW_READER : lti);
402fa9e4066Sahrens 		rw_downgrade(&zap->zap_rwlock);
403fa9e4066Sahrens 		lt = RW_READER;
404fa9e4066Sahrens 	}
405fa9e4066Sahrens 
406fa9e4066Sahrens 	zap->zap_objset = os;
407fa9e4066Sahrens 
408fa9e4066Sahrens 	if (lt == RW_WRITER)
409fa9e4066Sahrens 		dmu_buf_will_dirty(db, tx);
410fa9e4066Sahrens 
411fa9e4066Sahrens 	ASSERT3P(zap->zap_dbuf, ==, db);
412fa9e4066Sahrens 
413fa9e4066Sahrens 	ASSERT(!zap->zap_ismicro ||
414fa9e4066Sahrens 	    zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks);
415*c5f9e431Sahrens 	if (zap->zap_ismicro && tx && adding &&
416fa9e4066Sahrens 	    zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) {
417fa9e4066Sahrens 		uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE;
418fa9e4066Sahrens 		if (newsz > MZAP_MAX_BLKSZ) {
419fa9e4066Sahrens 			dprintf("upgrading obj %llu: num_entries=%u\n",
420fa9e4066Sahrens 			    obj, zap->zap_m.zap_num_entries);
421fa9e4066Sahrens 			mzap_upgrade(zap, tx);
422fa9e4066Sahrens 			*zapp = zap;
423fa9e4066Sahrens 			return (0);
424fa9e4066Sahrens 		}
425fa9e4066Sahrens 		err = dmu_object_set_blocksize(os, obj, newsz, 0, tx);
426fa9e4066Sahrens 		ASSERT3U(err, ==, 0);
427fa9e4066Sahrens 		zap->zap_m.zap_num_chunks =
428fa9e4066Sahrens 		    db->db_size / MZAP_ENT_LEN - 1;
429fa9e4066Sahrens 	}
430fa9e4066Sahrens 
431fa9e4066Sahrens 	*zapp = zap;
432fa9e4066Sahrens 	return (0);
433fa9e4066Sahrens }
434fa9e4066Sahrens 
435fa9e4066Sahrens void
436fa9e4066Sahrens zap_unlockdir(zap_t *zap)
437fa9e4066Sahrens {
438fa9e4066Sahrens 	rw_exit(&zap->zap_rwlock);
439ea8dc4b6Seschrock 	dmu_buf_rele(zap->zap_dbuf, NULL);
440fa9e4066Sahrens }
441fa9e4066Sahrens 
442fa9e4066Sahrens static void
443fa9e4066Sahrens mzap_upgrade(zap_t *zap, dmu_tx_t *tx)
444fa9e4066Sahrens {
445fa9e4066Sahrens 	mzap_phys_t *mzp;
446fa9e4066Sahrens 	int i, sz, nchunks, err;
447fa9e4066Sahrens 
448fa9e4066Sahrens 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
449fa9e4066Sahrens 
450fa9e4066Sahrens 	sz = zap->zap_dbuf->db_size;
451fa9e4066Sahrens 	mzp = kmem_alloc(sz, KM_SLEEP);
452fa9e4066Sahrens 	bcopy(zap->zap_dbuf->db_data, mzp, sz);
453fa9e4066Sahrens 	nchunks = zap->zap_m.zap_num_chunks;
454fa9e4066Sahrens 
455fa9e4066Sahrens 	err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
456f65e61c0Sahrens 	    1ULL << fzap_default_block_shift, 0, tx);
457fa9e4066Sahrens 	ASSERT(err == 0);
458fa9e4066Sahrens 
459fa9e4066Sahrens 	dprintf("upgrading obj=%llu with %u chunks\n",
460fa9e4066Sahrens 	    zap->zap_object, nchunks);
461da6c28aaSamw 	/* XXX destroy the avl later, so we can use the stored hash value */
462fa9e4066Sahrens 	mze_destroy(zap);
463fa9e4066Sahrens 
464fa9e4066Sahrens 	fzap_upgrade(zap, tx);
465fa9e4066Sahrens 
466fa9e4066Sahrens 	for (i = 0; i < nchunks; i++) {
467fa9e4066Sahrens 		int err;
468fa9e4066Sahrens 		mzap_ent_phys_t *mze = &mzp->mz_chunk[i];
469da6c28aaSamw 		zap_name_t *zn;
470fa9e4066Sahrens 		if (mze->mze_name[0] == 0)
471fa9e4066Sahrens 			continue;
472fa9e4066Sahrens 		dprintf("adding %s=%llu\n",
473fa9e4066Sahrens 		    mze->mze_name, mze->mze_value);
474da6c28aaSamw 		zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT);
475da6c28aaSamw 		err = fzap_add_cd(zn, 8, 1, &mze->mze_value,
476ea8dc4b6Seschrock 		    mze->mze_cd, tx);
477da6c28aaSamw 		zap_name_free(zn);
478fa9e4066Sahrens 		ASSERT3U(err, ==, 0);
479fa9e4066Sahrens 	}
480fa9e4066Sahrens 	kmem_free(mzp, sz);
481fa9e4066Sahrens }
482fa9e4066Sahrens 
483fa9e4066Sahrens static void
484da6c28aaSamw mzap_create_impl(objset_t *os, uint64_t obj, int normflags, dmu_tx_t *tx)
485fa9e4066Sahrens {
486fa9e4066Sahrens 	dmu_buf_t *db;
487fa9e4066Sahrens 	mzap_phys_t *zp;
488fa9e4066Sahrens 
489da6c28aaSamw 	ASSERT(normflags == 0 ||
490da6c28aaSamw 	    spa_version(dmu_objset_spa(os)) >= SPA_VERSION_NORMALIZATION);
491ea8dc4b6Seschrock 	VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db));
492fa9e4066Sahrens 
493fa9e4066Sahrens #ifdef ZFS_DEBUG
494fa9e4066Sahrens 	{
495fa9e4066Sahrens 		dmu_object_info_t doi;
496fa9e4066Sahrens 		dmu_object_info_from_db(db, &doi);
497fa9e4066Sahrens 		ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
498fa9e4066Sahrens 	}
499fa9e4066Sahrens #endif
500fa9e4066Sahrens 
501fa9e4066Sahrens 	dmu_buf_will_dirty(db, tx);
502fa9e4066Sahrens 	zp = db->db_data;
503fa9e4066Sahrens 	zp->mz_block_type = ZBT_MICRO;
504fa9e4066Sahrens 	zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL;
505da6c28aaSamw 	zp->mz_normflags = normflags;
506ea8dc4b6Seschrock 	dmu_buf_rele(db, FTAG);
507fa9e4066Sahrens }
508fa9e4066Sahrens 
509fa9e4066Sahrens int
510fa9e4066Sahrens zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot,
511fa9e4066Sahrens     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
512da6c28aaSamw {
513da6c28aaSamw 	return (zap_create_claim_norm(os, obj,
514da6c28aaSamw 	    0, ot, bonustype, bonuslen, tx));
515da6c28aaSamw }
516da6c28aaSamw 
517da6c28aaSamw int
518da6c28aaSamw zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags,
519da6c28aaSamw     dmu_object_type_t ot,
520da6c28aaSamw     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
521fa9e4066Sahrens {
522fa9e4066Sahrens 	int err;
523fa9e4066Sahrens 
524fa9e4066Sahrens 	err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx);
525fa9e4066Sahrens 	if (err != 0)
526fa9e4066Sahrens 		return (err);
527da6c28aaSamw 	mzap_create_impl(os, obj, normflags, tx);
528fa9e4066Sahrens 	return (0);
529fa9e4066Sahrens }
530fa9e4066Sahrens 
531fa9e4066Sahrens uint64_t
532fa9e4066Sahrens zap_create(objset_t *os, dmu_object_type_t ot,
533fa9e4066Sahrens     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
534da6c28aaSamw {
535da6c28aaSamw 	return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx));
536da6c28aaSamw }
537da6c28aaSamw 
538da6c28aaSamw uint64_t
539da6c28aaSamw zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot,
540da6c28aaSamw     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
541fa9e4066Sahrens {
542fa9e4066Sahrens 	uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx);
543fa9e4066Sahrens 
544da6c28aaSamw 	mzap_create_impl(os, obj, normflags, tx);
545fa9e4066Sahrens 	return (obj);
546fa9e4066Sahrens }
547fa9e4066Sahrens 
548fa9e4066Sahrens int
549fa9e4066Sahrens zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx)
550fa9e4066Sahrens {
551fa9e4066Sahrens 	/*
552fa9e4066Sahrens 	 * dmu_object_free will free the object number and free the
553fa9e4066Sahrens 	 * data.  Freeing the data will cause our pageout function to be
554fa9e4066Sahrens 	 * called, which will destroy our data (zap_leaf_t's and zap_t).
555fa9e4066Sahrens 	 */
556fa9e4066Sahrens 
557fa9e4066Sahrens 	return (dmu_object_free(os, zapobj, tx));
558fa9e4066Sahrens }
559fa9e4066Sahrens 
560fa9e4066Sahrens _NOTE(ARGSUSED(0))
561fa9e4066Sahrens void
562455d5089Sahrens zap_evict(dmu_buf_t *db, void *vzap)
563fa9e4066Sahrens {
564455d5089Sahrens 	zap_t *zap = vzap;
565fa9e4066Sahrens 
566fa9e4066Sahrens 	rw_destroy(&zap->zap_rwlock);
567fa9e4066Sahrens 
568f65e61c0Sahrens 	if (zap->zap_ismicro)
569fa9e4066Sahrens 		mze_destroy(zap);
570c25056deSgw 	else
571c25056deSgw 		mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
572fa9e4066Sahrens 
573fa9e4066Sahrens 	kmem_free(zap, sizeof (zap_t));
574fa9e4066Sahrens }
575fa9e4066Sahrens 
576fa9e4066Sahrens int
577fa9e4066Sahrens zap_count(objset_t *os, uint64_t zapobj, uint64_t *count)
578fa9e4066Sahrens {
579fa9e4066Sahrens 	zap_t *zap;
580fa9e4066Sahrens 	int err;
581fa9e4066Sahrens 
582*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
583fa9e4066Sahrens 	if (err)
584fa9e4066Sahrens 		return (err);
585fa9e4066Sahrens 	if (!zap->zap_ismicro) {
586fa9e4066Sahrens 		err = fzap_count(zap, count);
587fa9e4066Sahrens 	} else {
588fa9e4066Sahrens 		*count = zap->zap_m.zap_num_entries;
589fa9e4066Sahrens 	}
590fa9e4066Sahrens 	zap_unlockdir(zap);
591fa9e4066Sahrens 	return (err);
592fa9e4066Sahrens }
593fa9e4066Sahrens 
594fa9e4066Sahrens /*
595da6c28aaSamw  * zn may be NULL; if not specified, it will be computed if needed.
596da6c28aaSamw  * See also the comment above zap_entry_normalization_conflict().
597da6c28aaSamw  */
598da6c28aaSamw static boolean_t
599da6c28aaSamw mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze)
600da6c28aaSamw {
601da6c28aaSamw 	mzap_ent_t *other;
602da6c28aaSamw 	int direction = AVL_BEFORE;
603da6c28aaSamw 	boolean_t allocdzn = B_FALSE;
604da6c28aaSamw 
605da6c28aaSamw 	if (zap->zap_normflags == 0)
606da6c28aaSamw 		return (B_FALSE);
607da6c28aaSamw 
608da6c28aaSamw again:
609da6c28aaSamw 	for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction);
610da6c28aaSamw 	    other && other->mze_hash == mze->mze_hash;
611da6c28aaSamw 	    other = avl_walk(&zap->zap_m.zap_avl, other, direction)) {
612da6c28aaSamw 
613da6c28aaSamw 		if (zn == NULL) {
614da6c28aaSamw 			zn = zap_name_alloc(zap, mze->mze_phys.mze_name,
615da6c28aaSamw 			    MT_FIRST);
616da6c28aaSamw 			allocdzn = B_TRUE;
617da6c28aaSamw 		}
618da6c28aaSamw 		if (zap_match(zn, other->mze_phys.mze_name)) {
619da6c28aaSamw 			if (allocdzn)
620da6c28aaSamw 				zap_name_free(zn);
621da6c28aaSamw 			return (B_TRUE);
622da6c28aaSamw 		}
623da6c28aaSamw 	}
624da6c28aaSamw 
625da6c28aaSamw 	if (direction == AVL_BEFORE) {
626da6c28aaSamw 		direction = AVL_AFTER;
627da6c28aaSamw 		goto again;
628da6c28aaSamw 	}
629da6c28aaSamw 
630da6c28aaSamw 	if (allocdzn)
631da6c28aaSamw 		zap_name_free(zn);
632da6c28aaSamw 	return (B_FALSE);
633da6c28aaSamw }
634da6c28aaSamw 
635da6c28aaSamw /*
636da6c28aaSamw  * Routines for manipulating attributes.
637fa9e4066Sahrens  */
638fa9e4066Sahrens 
639fa9e4066Sahrens int
640fa9e4066Sahrens zap_lookup(objset_t *os, uint64_t zapobj, const char *name,
641fa9e4066Sahrens     uint64_t integer_size, uint64_t num_integers, void *buf)
642da6c28aaSamw {
643da6c28aaSamw 	return (zap_lookup_norm(os, zapobj, name, integer_size,
644da6c28aaSamw 	    num_integers, buf, MT_EXACT, NULL, 0, NULL));
645da6c28aaSamw }
646da6c28aaSamw 
647da6c28aaSamw int
648da6c28aaSamw zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name,
649da6c28aaSamw     uint64_t integer_size, uint64_t num_integers, void *buf,
650da6c28aaSamw     matchtype_t mt, char *realname, int rn_len,
651da6c28aaSamw     boolean_t *ncp)
652fa9e4066Sahrens {
653fa9e4066Sahrens 	zap_t *zap;
654fa9e4066Sahrens 	int err;
655fa9e4066Sahrens 	mzap_ent_t *mze;
656da6c28aaSamw 	zap_name_t *zn;
657fa9e4066Sahrens 
658*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
659fa9e4066Sahrens 	if (err)
660fa9e4066Sahrens 		return (err);
661da6c28aaSamw 	zn = zap_name_alloc(zap, name, mt);
662da6c28aaSamw 	if (zn == NULL) {
663da6c28aaSamw 		zap_unlockdir(zap);
664da6c28aaSamw 		return (ENOTSUP);
665da6c28aaSamw 	}
666da6c28aaSamw 
667fa9e4066Sahrens 	if (!zap->zap_ismicro) {
668da6c28aaSamw 		err = fzap_lookup(zn, integer_size, num_integers, buf,
669da6c28aaSamw 		    realname, rn_len, ncp);
670fa9e4066Sahrens 	} else {
671da6c28aaSamw 		mze = mze_find(zn);
672fa9e4066Sahrens 		if (mze == NULL) {
673fa9e4066Sahrens 			err = ENOENT;
674fa9e4066Sahrens 		} else {
675da6c28aaSamw 			if (num_integers < 1) {
676fa9e4066Sahrens 				err = EOVERFLOW;
677da6c28aaSamw 			} else if (integer_size != 8) {
678fa9e4066Sahrens 				err = EINVAL;
679da6c28aaSamw 			} else {
680fa9e4066Sahrens 				*(uint64_t *)buf = mze->mze_phys.mze_value;
681da6c28aaSamw 				(void) strlcpy(realname,
682da6c28aaSamw 				    mze->mze_phys.mze_name, rn_len);
683da6c28aaSamw 				if (ncp) {
684da6c28aaSamw 					*ncp = mzap_normalization_conflict(zap,
685da6c28aaSamw 					    zn, mze);
686da6c28aaSamw 				}
687da6c28aaSamw 			}
688fa9e4066Sahrens 		}
689fa9e4066Sahrens 	}
690da6c28aaSamw 	zap_name_free(zn);
691fa9e4066Sahrens 	zap_unlockdir(zap);
692fa9e4066Sahrens 	return (err);
693fa9e4066Sahrens }
694fa9e4066Sahrens 
695fa9e4066Sahrens int
696fa9e4066Sahrens zap_length(objset_t *os, uint64_t zapobj, const char *name,
697fa9e4066Sahrens     uint64_t *integer_size, uint64_t *num_integers)
698fa9e4066Sahrens {
699fa9e4066Sahrens 	zap_t *zap;
700fa9e4066Sahrens 	int err;
701fa9e4066Sahrens 	mzap_ent_t *mze;
702da6c28aaSamw 	zap_name_t *zn;
703fa9e4066Sahrens 
704*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
705fa9e4066Sahrens 	if (err)
706fa9e4066Sahrens 		return (err);
707da6c28aaSamw 	zn = zap_name_alloc(zap, name, MT_EXACT);
708da6c28aaSamw 	if (zn == NULL) {
709da6c28aaSamw 		zap_unlockdir(zap);
710da6c28aaSamw 		return (ENOTSUP);
711da6c28aaSamw 	}
712fa9e4066Sahrens 	if (!zap->zap_ismicro) {
713da6c28aaSamw 		err = fzap_length(zn, integer_size, num_integers);
714fa9e4066Sahrens 	} else {
715da6c28aaSamw 		mze = mze_find(zn);
716fa9e4066Sahrens 		if (mze == NULL) {
717fa9e4066Sahrens 			err = ENOENT;
718fa9e4066Sahrens 		} else {
719fa9e4066Sahrens 			if (integer_size)
720fa9e4066Sahrens 				*integer_size = 8;
721fa9e4066Sahrens 			if (num_integers)
722fa9e4066Sahrens 				*num_integers = 1;
723fa9e4066Sahrens 		}
724fa9e4066Sahrens 	}
725da6c28aaSamw 	zap_name_free(zn);
726fa9e4066Sahrens 	zap_unlockdir(zap);
727fa9e4066Sahrens 	return (err);
728fa9e4066Sahrens }
729fa9e4066Sahrens 
730fa9e4066Sahrens static void
731da6c28aaSamw mzap_addent(zap_name_t *zn, uint64_t value)
732fa9e4066Sahrens {
733fa9e4066Sahrens 	int i;
734da6c28aaSamw 	zap_t *zap = zn->zn_zap;
735fa9e4066Sahrens 	int start = zap->zap_m.zap_alloc_next;
736fa9e4066Sahrens 	uint32_t cd;
737fa9e4066Sahrens 
738da6c28aaSamw 	dprintf("obj=%llu %s=%llu\n", zap->zap_object,
739da6c28aaSamw 	    zn->zn_name_orij, value);
740fa9e4066Sahrens 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
741fa9e4066Sahrens 
742fa9e4066Sahrens #ifdef ZFS_DEBUG
743fa9e4066Sahrens 	for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
744fa9e4066Sahrens 		mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
745da6c28aaSamw 		ASSERT(strcmp(zn->zn_name_orij, mze->mze_name) != 0);
746fa9e4066Sahrens 	}
747fa9e4066Sahrens #endif
748fa9e4066Sahrens 
749da6c28aaSamw 	cd = mze_find_unused_cd(zap, zn->zn_hash);
750fa9e4066Sahrens 	/* given the limited size of the microzap, this can't happen */
751fa9e4066Sahrens 	ASSERT(cd != ZAP_MAXCD);
752fa9e4066Sahrens 
753fa9e4066Sahrens again:
754fa9e4066Sahrens 	for (i = start; i < zap->zap_m.zap_num_chunks; i++) {
755fa9e4066Sahrens 		mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
756fa9e4066Sahrens 		if (mze->mze_name[0] == 0) {
757fa9e4066Sahrens 			mze->mze_value = value;
758fa9e4066Sahrens 			mze->mze_cd = cd;
759da6c28aaSamw 			(void) strcpy(mze->mze_name, zn->zn_name_orij);
760fa9e4066Sahrens 			zap->zap_m.zap_num_entries++;
761fa9e4066Sahrens 			zap->zap_m.zap_alloc_next = i+1;
762fa9e4066Sahrens 			if (zap->zap_m.zap_alloc_next ==
763fa9e4066Sahrens 			    zap->zap_m.zap_num_chunks)
764fa9e4066Sahrens 				zap->zap_m.zap_alloc_next = 0;
765da6c28aaSamw 			mze_insert(zap, i, zn->zn_hash, mze);
766fa9e4066Sahrens 			return;
767fa9e4066Sahrens 		}
768fa9e4066Sahrens 	}
769fa9e4066Sahrens 	if (start != 0) {
770fa9e4066Sahrens 		start = 0;
771fa9e4066Sahrens 		goto again;
772fa9e4066Sahrens 	}
773fa9e4066Sahrens 	ASSERT(!"out of entries!");
774fa9e4066Sahrens }
775fa9e4066Sahrens 
776fa9e4066Sahrens int
777fa9e4066Sahrens zap_add(objset_t *os, uint64_t zapobj, const char *name,
778fa9e4066Sahrens     int integer_size, uint64_t num_integers,
779fa9e4066Sahrens     const void *val, dmu_tx_t *tx)
780fa9e4066Sahrens {
781fa9e4066Sahrens 	zap_t *zap;
782fa9e4066Sahrens 	int err;
783fa9e4066Sahrens 	mzap_ent_t *mze;
784fa9e4066Sahrens 	const uint64_t *intval = val;
785da6c28aaSamw 	zap_name_t *zn;
786fa9e4066Sahrens 
787*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
788fa9e4066Sahrens 	if (err)
789fa9e4066Sahrens 		return (err);
790da6c28aaSamw 	zn = zap_name_alloc(zap, name, MT_EXACT);
791da6c28aaSamw 	if (zn == NULL) {
792da6c28aaSamw 		zap_unlockdir(zap);
793da6c28aaSamw 		return (ENOTSUP);
794da6c28aaSamw 	}
795fa9e4066Sahrens 	if (!zap->zap_ismicro) {
796da6c28aaSamw 		err = fzap_add(zn, integer_size, num_integers, val, tx);
797fa9e4066Sahrens 	} else if (integer_size != 8 || num_integers != 1 ||
798fa9e4066Sahrens 	    strlen(name) >= MZAP_NAME_LEN) {
799fa9e4066Sahrens 		dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
800fa9e4066Sahrens 		    zapobj, integer_size, num_integers, name);
801fa9e4066Sahrens 		mzap_upgrade(zap, tx);
802da6c28aaSamw 		err = fzap_add(zn, integer_size, num_integers, val, tx);
803fa9e4066Sahrens 	} else {
804da6c28aaSamw 		mze = mze_find(zn);
805fa9e4066Sahrens 		if (mze != NULL) {
806fa9e4066Sahrens 			err = EEXIST;
807fa9e4066Sahrens 		} else {
808da6c28aaSamw 			mzap_addent(zn, *intval);
809fa9e4066Sahrens 		}
810fa9e4066Sahrens 	}
811da6c28aaSamw 	zap_name_free(zn);
812fa9e4066Sahrens 	zap_unlockdir(zap);
813fa9e4066Sahrens 	return (err);
814fa9e4066Sahrens }
815fa9e4066Sahrens 
816fa9e4066Sahrens int
817fa9e4066Sahrens zap_update(objset_t *os, uint64_t zapobj, const char *name,
818fa9e4066Sahrens     int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
819fa9e4066Sahrens {
820fa9e4066Sahrens 	zap_t *zap;
821fa9e4066Sahrens 	mzap_ent_t *mze;
822fa9e4066Sahrens 	const uint64_t *intval = val;
823da6c28aaSamw 	zap_name_t *zn;
824fa9e4066Sahrens 	int err;
825fa9e4066Sahrens 
826*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
827fa9e4066Sahrens 	if (err)
828fa9e4066Sahrens 		return (err);
829da6c28aaSamw 	zn = zap_name_alloc(zap, name, MT_EXACT);
830da6c28aaSamw 	if (zn == NULL) {
831da6c28aaSamw 		zap_unlockdir(zap);
832da6c28aaSamw 		return (ENOTSUP);
833da6c28aaSamw 	}
834fa9e4066Sahrens 	if (!zap->zap_ismicro) {
835da6c28aaSamw 		err = fzap_update(zn, integer_size, num_integers, val, tx);
836fa9e4066Sahrens 	} else if (integer_size != 8 || num_integers != 1 ||
837fa9e4066Sahrens 	    strlen(name) >= MZAP_NAME_LEN) {
838fa9e4066Sahrens 		dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
839fa9e4066Sahrens 		    zapobj, integer_size, num_integers, name);
840fa9e4066Sahrens 		mzap_upgrade(zap, tx);
841da6c28aaSamw 		err = fzap_update(zn, integer_size, num_integers, val, tx);
842fa9e4066Sahrens 	} else {
843da6c28aaSamw 		mze = mze_find(zn);
844fa9e4066Sahrens 		if (mze != NULL) {
845fa9e4066Sahrens 			mze->mze_phys.mze_value = *intval;
846fa9e4066Sahrens 			zap->zap_m.zap_phys->mz_chunk
847fa9e4066Sahrens 			    [mze->mze_chunkid].mze_value = *intval;
848fa9e4066Sahrens 		} else {
849da6c28aaSamw 			mzap_addent(zn, *intval);
850fa9e4066Sahrens 		}
851fa9e4066Sahrens 	}
852da6c28aaSamw 	zap_name_free(zn);
853fa9e4066Sahrens 	zap_unlockdir(zap);
854455d5089Sahrens 	return (err);
855fa9e4066Sahrens }
856fa9e4066Sahrens 
857fa9e4066Sahrens int
858fa9e4066Sahrens zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx)
859da6c28aaSamw {
860da6c28aaSamw 	return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx));
861da6c28aaSamw }
862da6c28aaSamw 
863da6c28aaSamw int
864da6c28aaSamw zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name,
865da6c28aaSamw     matchtype_t mt, dmu_tx_t *tx)
866fa9e4066Sahrens {
867fa9e4066Sahrens 	zap_t *zap;
868fa9e4066Sahrens 	int err;
869fa9e4066Sahrens 	mzap_ent_t *mze;
870da6c28aaSamw 	zap_name_t *zn;
871fa9e4066Sahrens 
872*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap);
873fa9e4066Sahrens 	if (err)
874fa9e4066Sahrens 		return (err);
875da6c28aaSamw 	zn = zap_name_alloc(zap, name, mt);
876da6c28aaSamw 	if (zn == NULL) {
877da6c28aaSamw 		zap_unlockdir(zap);
878da6c28aaSamw 		return (ENOTSUP);
879da6c28aaSamw 	}
880fa9e4066Sahrens 	if (!zap->zap_ismicro) {
881da6c28aaSamw 		err = fzap_remove(zn, tx);
882fa9e4066Sahrens 	} else {
883da6c28aaSamw 		mze = mze_find(zn);
884fa9e4066Sahrens 		if (mze == NULL) {
885fa9e4066Sahrens 			err = ENOENT;
886fa9e4066Sahrens 		} else {
887fa9e4066Sahrens 			zap->zap_m.zap_num_entries--;
888fa9e4066Sahrens 			bzero(&zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid],
889fa9e4066Sahrens 			    sizeof (mzap_ent_phys_t));
890fa9e4066Sahrens 			mze_remove(zap, mze);
891fa9e4066Sahrens 		}
892fa9e4066Sahrens 	}
893da6c28aaSamw 	zap_name_free(zn);
894fa9e4066Sahrens 	zap_unlockdir(zap);
895fa9e4066Sahrens 	return (err);
896fa9e4066Sahrens }
897fa9e4066Sahrens 
898fa9e4066Sahrens /*
899fa9e4066Sahrens  * Routines for iterating over the attributes.
900fa9e4066Sahrens  */
901fa9e4066Sahrens 
902fa9e4066Sahrens /*
903fa9e4066Sahrens  * We want to keep the high 32 bits of the cursor zero if we can, so
904fa9e4066Sahrens  * that 32-bit programs can access this.  So use a small hash value so
905fa9e4066Sahrens  * we can fit 4 bits of cd into the 32-bit cursor.
906fa9e4066Sahrens  *
907fa9e4066Sahrens  * [ 4 zero bits | 32-bit collision differentiator | 28-bit hash value ]
908fa9e4066Sahrens  */
909fa9e4066Sahrens void
910fa9e4066Sahrens zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
911fa9e4066Sahrens     uint64_t serialized)
912fa9e4066Sahrens {
913fa9e4066Sahrens 	zc->zc_objset = os;
91487e5029aSahrens 	zc->zc_zap = NULL;
91587e5029aSahrens 	zc->zc_leaf = NULL;
916fa9e4066Sahrens 	zc->zc_zapobj = zapobj;
917fa9e4066Sahrens 	if (serialized == -1ULL) {
918fa9e4066Sahrens 		zc->zc_hash = -1ULL;
919fa9e4066Sahrens 		zc->zc_cd = 0;
920fa9e4066Sahrens 	} else {
921fa9e4066Sahrens 		zc->zc_hash = serialized << (64-ZAP_HASHBITS);
922fa9e4066Sahrens 		zc->zc_cd = serialized >> ZAP_HASHBITS;
923fa9e4066Sahrens 		if (zc->zc_cd >= ZAP_MAXCD) /* corrupt serialized */
924fa9e4066Sahrens 			zc->zc_cd = 0;
925fa9e4066Sahrens 	}
926fa9e4066Sahrens }
927fa9e4066Sahrens 
92887e5029aSahrens void
92987e5029aSahrens zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
93087e5029aSahrens {
93187e5029aSahrens 	zap_cursor_init_serialized(zc, os, zapobj, 0);
93287e5029aSahrens }
93387e5029aSahrens 
93487e5029aSahrens void
93587e5029aSahrens zap_cursor_fini(zap_cursor_t *zc)
93687e5029aSahrens {
93787e5029aSahrens 	if (zc->zc_zap) {
93887e5029aSahrens 		rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
93987e5029aSahrens 		zap_unlockdir(zc->zc_zap);
94087e5029aSahrens 		zc->zc_zap = NULL;
94187e5029aSahrens 	}
94287e5029aSahrens 	if (zc->zc_leaf) {
94387e5029aSahrens 		rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
94487e5029aSahrens 		zap_put_leaf(zc->zc_leaf);
94587e5029aSahrens 		zc->zc_leaf = NULL;
94687e5029aSahrens 	}
94787e5029aSahrens 	zc->zc_objset = NULL;
94887e5029aSahrens }
94987e5029aSahrens 
950fa9e4066Sahrens uint64_t
951fa9e4066Sahrens zap_cursor_serialize(zap_cursor_t *zc)
952fa9e4066Sahrens {
953fa9e4066Sahrens 	if (zc->zc_hash == -1ULL)
954fa9e4066Sahrens 		return (-1ULL);
955fa9e4066Sahrens 	ASSERT((zc->zc_hash & (ZAP_MAXCD-1)) == 0);
956fa9e4066Sahrens 	ASSERT(zc->zc_cd < ZAP_MAXCD);
957fa9e4066Sahrens 	return ((zc->zc_hash >> (64-ZAP_HASHBITS)) |
958fa9e4066Sahrens 	    ((uint64_t)zc->zc_cd << ZAP_HASHBITS));
959fa9e4066Sahrens }
960fa9e4066Sahrens 
961fa9e4066Sahrens int
962fa9e4066Sahrens zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za)
963fa9e4066Sahrens {
964fa9e4066Sahrens 	int err;
965fa9e4066Sahrens 	avl_index_t idx;
966fa9e4066Sahrens 	mzap_ent_t mze_tofind;
967fa9e4066Sahrens 	mzap_ent_t *mze;
968fa9e4066Sahrens 
969fa9e4066Sahrens 	if (zc->zc_hash == -1ULL)
970fa9e4066Sahrens 		return (ENOENT);
971fa9e4066Sahrens 
97287e5029aSahrens 	if (zc->zc_zap == NULL) {
97387e5029aSahrens 		err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
974*c5f9e431Sahrens 		    RW_READER, TRUE, FALSE, &zc->zc_zap);
97587e5029aSahrens 		if (err)
97687e5029aSahrens 			return (err);
97787e5029aSahrens 	} else {
97887e5029aSahrens 		rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
97987e5029aSahrens 	}
98087e5029aSahrens 	if (!zc->zc_zap->zap_ismicro) {
98187e5029aSahrens 		err = fzap_cursor_retrieve(zc->zc_zap, zc, za);
982fa9e4066Sahrens 	} else {
983fa9e4066Sahrens 		err = ENOENT;
984fa9e4066Sahrens 
985fa9e4066Sahrens 		mze_tofind.mze_hash = zc->zc_hash;
986fa9e4066Sahrens 		mze_tofind.mze_phys.mze_cd = zc->zc_cd;
987fa9e4066Sahrens 
98887e5029aSahrens 		mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx);
98987e5029aSahrens 		if (mze == NULL) {
99087e5029aSahrens 			mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl,
99187e5029aSahrens 			    idx, AVL_AFTER);
99287e5029aSahrens 		}
993fa9e4066Sahrens 		if (mze) {
994da6c28aaSamw 			ASSERT(0 == bcmp(&mze->mze_phys,
995da6c28aaSamw 			    &zc->zc_zap->zap_m.zap_phys->mz_chunk
996da6c28aaSamw 			    [mze->mze_chunkid], sizeof (mze->mze_phys)));
997da6c28aaSamw 
998da6c28aaSamw 			za->za_normalization_conflict =
999da6c28aaSamw 			    mzap_normalization_conflict(zc->zc_zap, NULL, mze);
1000fa9e4066Sahrens 			za->za_integer_length = 8;
1001fa9e4066Sahrens 			za->za_num_integers = 1;
1002fa9e4066Sahrens 			za->za_first_integer = mze->mze_phys.mze_value;
1003fa9e4066Sahrens 			(void) strcpy(za->za_name, mze->mze_phys.mze_name);
1004fa9e4066Sahrens 			zc->zc_hash = mze->mze_hash;
1005fa9e4066Sahrens 			zc->zc_cd = mze->mze_phys.mze_cd;
1006fa9e4066Sahrens 			err = 0;
1007fa9e4066Sahrens 		} else {
1008fa9e4066Sahrens 			zc->zc_hash = -1ULL;
1009fa9e4066Sahrens 		}
1010fa9e4066Sahrens 	}
101187e5029aSahrens 	rw_exit(&zc->zc_zap->zap_rwlock);
1012fa9e4066Sahrens 	return (err);
1013fa9e4066Sahrens }
1014fa9e4066Sahrens 
1015fa9e4066Sahrens void
1016fa9e4066Sahrens zap_cursor_advance(zap_cursor_t *zc)
1017fa9e4066Sahrens {
1018fa9e4066Sahrens 	if (zc->zc_hash == -1ULL)
1019fa9e4066Sahrens 		return;
1020fa9e4066Sahrens 	zc->zc_cd++;
1021fa9e4066Sahrens 	if (zc->zc_cd >= ZAP_MAXCD) {
1022fa9e4066Sahrens 		zc->zc_cd = 0;
1023fa9e4066Sahrens 		zc->zc_hash += 1ULL<<(64-ZAP_HASHBITS);
1024fa9e4066Sahrens 		if (zc->zc_hash == 0) /* EOF */
1025fa9e4066Sahrens 			zc->zc_hash = -1ULL;
1026fa9e4066Sahrens 	}
1027fa9e4066Sahrens }
1028fa9e4066Sahrens 
1029fa9e4066Sahrens int
1030fa9e4066Sahrens zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs)
1031fa9e4066Sahrens {
1032fa9e4066Sahrens 	int err;
1033fa9e4066Sahrens 	zap_t *zap;
1034fa9e4066Sahrens 
1035*c5f9e431Sahrens 	err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
1036fa9e4066Sahrens 	if (err)
1037fa9e4066Sahrens 		return (err);
1038fa9e4066Sahrens 
1039fa9e4066Sahrens 	bzero(zs, sizeof (zap_stats_t));
1040fa9e4066Sahrens 
1041fa9e4066Sahrens 	if (zap->zap_ismicro) {
1042fa9e4066Sahrens 		zs->zs_blocksize = zap->zap_dbuf->db_size;
1043fa9e4066Sahrens 		zs->zs_num_entries = zap->zap_m.zap_num_entries;
1044fa9e4066Sahrens 		zs->zs_num_blocks = 1;
1045fa9e4066Sahrens 	} else {
1046fa9e4066Sahrens 		fzap_get_stats(zap, zs);
1047fa9e4066Sahrens 	}
1048fa9e4066Sahrens 	zap_unlockdir(zap);
1049fa9e4066Sahrens 	return (0);
1050fa9e4066Sahrens }
1051