4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see [sun.com URL with a
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2015, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 * implementation of iam format for fixed size records, variable sized keys.
40 * Author: Nikita Danilov <nikita@clusterfs.com>
43 #include <linux/types.h>
44 #include "osd_internal.h"
51 IAM_LVAR_LEAF_MAGIC = 0x1973 /* This is duplicated in
52 * lustre/utils/create_iam.c */
55 /* This is duplicated in lustre/utils/create_iam.c */
56 struct lvar_leaf_header {
57 __le16 vlh_magic; /* magic number IAM_LVAR_LEAF_MAGIC */
58 __le16 vlh_used; /* used bytes, including header */
62 * Format of leaf entry:
68 * Entries are ordered in key order.
71 /* This is duplicated in lustre/utils/create_iam.c */
72 typedef __u32 lvar_hash_t;
74 /* This is duplicated in lustre/utils/create_iam.c */
75 struct lvar_leaf_entry {
81 #define PDIFF(ptr0, ptr1) (((char *)(ptr0)) - ((char *)(ptr1)))
84 static inline int blocksize(const struct iam_leaf *leaf)
86 return iam_leaf_container(leaf)->ic_object->i_sb->s_blocksize;
89 static inline const char *kchar(const struct iam_key *key)
94 static inline struct iam_lentry *lvar_lentry(const struct lvar_leaf_entry *ent)
96 return (struct iam_lentry *)ent;
99 static inline struct lvar_leaf_entry *lentry_lvar(const struct iam_lentry *lent)
101 return (struct lvar_leaf_entry *)lent;
105 static inline int e_keysize(const struct lvar_leaf_entry *ent)
107 return le16_to_cpu(ent->vle_keysize);
110 /* This is duplicated in lustre/utils/create_iam.c */
113 LVAR_ROUND = LVAR_PAD - 1
116 static inline int getsize(const struct iam_leaf *leaf, int namelen, int recsize)
118 CLASSERT(!(LVAR_PAD & (LVAR_PAD - 1)));
120 return (offsetof(struct lvar_leaf_entry, vle_key) +
121 namelen + recsize + LVAR_ROUND) & ~LVAR_ROUND;
124 static inline int rec_size(const struct iam_rec *rec)
126 return *(const char *)rec;
129 static inline struct iam_rec *e_rec(const struct lvar_leaf_entry *ent)
131 return ((void *)ent) +
132 offsetof(struct lvar_leaf_entry, vle_key) + e_keysize(ent);
135 static inline int e_size(const struct iam_leaf *leaf,
136 const struct lvar_leaf_entry *ent)
138 return getsize(leaf, e_keysize(ent), rec_size(e_rec(ent)));
141 static inline char *e_char(const struct lvar_leaf_entry *ent)
143 return (char *)&ent->vle_key;
146 static inline struct iam_key *e_key(const struct lvar_leaf_entry *ent)
148 return (struct iam_key *)e_char(ent);
151 static inline lvar_hash_t e_hash(const struct lvar_leaf_entry *ent)
153 return le32_to_cpu(ent->vle_hash);
156 static void e_print(const struct lvar_leaf_entry *ent)
158 printk(" %p %8.8x \"%*.*s\"\n", ent, e_hash(ent),
159 e_keysize(ent), e_keysize(ent), e_char(ent));
162 static inline struct lvar_leaf_entry *e_next(const struct iam_leaf *leaf,
163 const struct lvar_leaf_entry *ent)
165 return ((void *)ent) + e_size(leaf, ent);
168 #define LVAR_HASH_SANDWICH (0)
169 #define LVAR_HASH_TEA (1)
170 #define LVAR_HASH_R5 (0)
171 #define LVAR_HASH_PREFIX (0)
173 static __u32 hash_build0(const char *name, int namelen)
179 if (strncmp(name, ".", 1) == 0 && namelen == 1)
181 if (strncmp(name, "..", 2) == 0 && namelen == 2)
184 if (LVAR_HASH_PREFIX) {
186 strncpy((void *)&result,
187 name, min(namelen, (int)sizeof result));
189 struct ldiskfs_dx_hash_info hinfo;
191 hinfo.hash_version = LDISKFS_DX_HASH_TEA;
193 ldiskfsfs_dirhash(name, namelen, &hinfo);
195 if (LVAR_HASH_SANDWICH) {
198 hinfo.hash_version = LDISKFS_DX_HASH_TEA;
200 ldiskfsfs_dirhash(name, namelen, &hinfo);
201 result2 = hinfo.hash;
202 result = (0xfc000000 & result2) | (0x03ffffff & result);
209 HASH_GRAY_AREA = 1024,
210 HASH_MAX_SIZE = 0x7fffffffUL
213 static __u32 hash_build(const char *name, int namelen)
217 hash = (hash_build0(name, namelen) << 1) & HASH_MAX_SIZE;
218 if (hash > HASH_MAX_SIZE - HASH_GRAY_AREA)
219 hash &= HASH_GRAY_AREA - 1;
223 static inline lvar_hash_t get_hash(const struct iam_container *bag,
224 const char *name, int namelen)
226 return hash_build(name, namelen);
229 static inline int e_eq(const struct lvar_leaf_entry *ent,
230 const char *name, int namelen)
232 return namelen == e_keysize(ent) && !memcmp(e_char(ent), name, namelen);
235 static inline int e_cmp(const struct iam_leaf *leaf,
236 const struct lvar_leaf_entry *ent, lvar_hash_t hash)
241 return ehash == hash ? 0 : (ehash < hash ? -1 : +1);
244 static struct lvar_leaf_header *n_head(const struct iam_leaf *l)
246 return (struct lvar_leaf_header *)l->il_bh->b_data;
249 static int h_used(const struct lvar_leaf_header *hdr)
251 return le16_to_cpu(hdr->vlh_used);
254 static void h_used_adj(const struct iam_leaf *leaf,
255 struct lvar_leaf_header *hdr, int adj)
259 used = h_used(hdr) + adj;
260 assert_corr(sizeof *hdr <= used && used <= blocksize(leaf));
261 hdr->vlh_used = cpu_to_le16(used);
264 static struct lvar_leaf_entry *n_start(const struct iam_leaf *leaf)
266 return (void *)leaf->il_bh->b_data + sizeof(struct lvar_leaf_header);
269 static struct lvar_leaf_entry *n_end(const struct iam_leaf *l)
271 return (void *)l->il_bh->b_data + h_used(n_head(l));
274 static struct lvar_leaf_entry *n_cur(const struct iam_leaf *l)
276 return lentry_lvar(l->il_at);
279 void n_print(const struct iam_leaf *l)
281 struct lvar_leaf_entry *scan;
283 printk(KERN_EMERG "used: %d\n", h_used(n_head(l)));
284 for (scan = n_start(l); scan < n_end(l); scan = e_next(l, scan))
288 #if LDISKFS_CORRECTNESS_ON
289 static int n_at_rec(const struct iam_leaf *folio)
292 n_start(folio) <= lentry_lvar(folio->il_at) &&
293 lentry_lvar(folio->il_at) < n_end(folio);
296 #if LDISKFS_INVARIANT_ON
297 static int n_invariant(const struct iam_leaf *leaf)
299 struct iam_path *path;
300 struct lvar_leaf_entry *scan;
301 struct lvar_leaf_entry *end;
303 lvar_hash_t nexthash;
304 lvar_hash_t starthash;
308 path = leaf->il_path;
310 if (h_used(n_head(leaf)) > blocksize(leaf))
314 * Delimiting key in the parent index node. Clear least bit to account
315 * for hash collision marker.
317 starthash = *(lvar_hash_t *)iam_ikey_at(path, path->ip_frame->at) & ~1;
318 for (scan = n_start(leaf); scan < end; scan = e_next(leaf, scan)) {
319 nexthash = e_hash(scan);
320 if (nexthash != get_hash(iam_leaf_container(leaf),
321 e_char(scan), e_keysize(scan))) {
325 if (0 && nexthash < starthash) {
327 * Unfortunately this useful invariant cannot be
328 * reliably checked as parent node is nor necessarily
332 printk("%#x < %#x\n", nexthash, starthash);
336 if (nexthash < hash) {
348 /* LDISKFS_INVARIANT_ON */
351 /* LDISKFS_CORRECTNESS_ON */
354 static struct iam_ikey *lvar_ikey(const struct iam_leaf *l,
355 struct iam_ikey *key)
359 assert_corr(n_at_rec(l));
362 *hash = e_hash(n_cur(l));
366 static struct iam_key *lvar_key(const struct iam_leaf *l)
368 return e_key(n_cur(l));
371 static int lvar_key_size(const struct iam_leaf *l)
373 return e_keysize(n_cur(l));
376 static void lvar_start(struct iam_leaf *l)
378 l->il_at = lvar_lentry(n_start(l));
381 static int lvar_init(struct iam_leaf *l)
385 struct lvar_leaf_header *head;
387 assert_corr(l->il_bh != NULL);
391 if (le16_to_cpu(head->vlh_magic) == IAM_LVAR_LEAF_MAGIC &&
392 used <= blocksize(l)) {
393 l->il_at = l->il_entries = lvar_lentry(n_start(l));
398 obj = iam_leaf_container(l)->ic_object;
399 CERROR("Wrong magic in node %llu (#%lu): %#x != %#x or "
401 (unsigned long long)l->il_bh->b_blocknr, obj->i_ino,
402 le16_to_cpu(head->vlh_magic), IAM_LVAR_LEAF_MAGIC,
409 static void lvar_fini(struct iam_leaf *l)
411 l->il_entries = l->il_at = NULL;
414 static struct iam_rec *lvar_rec(const struct iam_leaf *l)
416 assert_corr(n_at_rec(l));
417 return e_rec(n_cur(l));
420 static void lvar_next(struct iam_leaf *l)
422 assert_corr(n_at_rec(l));
423 assert_corr(iam_leaf_is_locked(l));
424 l->il_at = lvar_lentry(e_next(l, n_cur(l)));
427 static int lvar_lookup(struct iam_leaf *leaf, const struct iam_key *k)
429 struct lvar_leaf_entry *found;
430 struct lvar_leaf_entry *scan;
431 struct lvar_leaf_entry *end;
439 assert_inv(n_invariant(leaf));
443 namelen = strlen(name);
444 hash = get_hash(iam_leaf_container(leaf), name, namelen);
449 for (scan = n_start(leaf); scan < end; scan = e_next(leaf, scan)) {
450 lvar_hash_t scan_hash;
452 scan_hash = e_hash(scan);
453 if (scan_hash < hash)
455 else if (scan_hash == hash) {
456 if (e_eq(scan, name, namelen)) {
460 leaf->il_at = lvar_lentry(scan);
461 return IAM_LOOKUP_EXACT;
462 } else if (!found_equal) {
473 * @k is less than all hashes in the leaf.
476 result = IAM_LOOKUP_BEFORE;
478 leaf->il_at = lvar_lentry(found);
479 result = IAM_LOOKUP_OK;
480 assert_corr(n_at_rec(leaf));
483 result |= IAM_LOOKUP_LAST;
484 assert_inv(n_invariant(leaf));
489 static int lvar_ilookup(struct iam_leaf *leaf, const struct iam_ikey *ik)
491 struct lvar_leaf_entry *scan;
492 struct lvar_leaf_entry *end;
495 assert_inv(n_invariant(leaf));
497 hash = *(const lvar_hash_t *)ik;
500 for (scan = n_start(leaf); scan < end; scan = e_next(leaf, scan)) {
501 lvar_hash_t scan_hash;
503 scan_hash = e_hash(scan);
504 if (scan_hash > hash)
505 return scan == n_start(leaf) ?
506 IAM_LOOKUP_BEFORE : IAM_LOOKUP_OK;
507 leaf->il_at = lvar_lentry(scan);
508 if (scan_hash == hash)
509 return IAM_LOOKUP_EXACT;
511 assert_inv(n_invariant(leaf));
513 * @ik is greater than any key in the node. Return last record in the
516 return IAM_LOOKUP_OK;
519 static void __lvar_key_set(struct iam_leaf *l, const struct iam_key *k)
521 memcpy(e_key(n_cur(l)), k, e_keysize(n_cur(l)));
524 static void lvar_key_set(struct iam_leaf *l, const struct iam_key *k)
526 assert_corr(n_at_rec(l));
527 assert_corr(strlen(kchar(k)) == e_keysize(n_cur(l)));
528 assert_corr(iam_leaf_is_locked(l));
529 __lvar_key_set(l, k);
530 assert_inv(n_invariant(l));
533 static int lvar_key_cmp(const struct iam_leaf *l, const struct iam_key *k)
540 hash = get_hash(iam_leaf_container(l), name, strlen(name));
541 return e_cmp(l, n_cur(l), hash);
544 static int lvar_key_eq(const struct iam_leaf *l, const struct iam_key *k)
549 return e_eq(n_cur(l), name, strlen(name));
552 static void __lvar_rec_set(struct iam_leaf *l, const struct iam_rec *r)
554 memcpy(e_rec(n_cur(l)), r, rec_size(r));
557 static void lvar_rec_set(struct iam_leaf *l, const struct iam_rec *r)
559 assert_corr(n_at_rec(l));
560 assert_corr(iam_leaf_is_locked(l));
561 __lvar_rec_set(l, r);
562 assert_inv(n_invariant(l));
565 static int lvar_rec_eq(const struct iam_leaf *l, const struct iam_rec *r)
567 struct iam_rec *rec = e_rec(n_cur(l));
569 if (rec_size(rec) != rec_size(r))
571 return !memcmp(rec, r, rec_size(r));
574 static void lvar_rec_get(const struct iam_leaf *l, struct iam_rec *r)
578 rec = e_rec(n_cur(l));
579 assert_corr(n_at_rec(l));
580 assert_corr(iam_leaf_is_locked(l));
581 memcpy(r, rec, rec_size(rec));
582 assert_inv(n_invariant(l));
585 static int lvar_can_add(const struct iam_leaf *l,
586 const struct iam_key *k, const struct iam_rec *r)
588 assert_corr(iam_leaf_is_locked(l));
591 getsize(l, strlen(kchar(k)), rec_size(r)) <= blocksize(l);
594 static int lvar_at_end(const struct iam_leaf *folio)
596 assert_corr(iam_leaf_is_locked(folio));
597 return n_cur(folio) == n_end(folio);
600 static void lvar_rec_add(struct iam_leaf *leaf,
601 const struct iam_key *k, const struct iam_rec *r)
610 assert_corr(lvar_can_add(leaf, k, r));
611 assert_inv(n_invariant(leaf));
612 assert_corr(iam_leaf_is_locked(leaf));
616 shift = getsize(leaf, ksize, rec_size(r));
618 if (!lvar_at_end(leaf)) {
619 assert_corr(n_cur(leaf) < n_end(leaf));
621 if (lvar_key_cmp(leaf, k) <= 0)
625 * Another exceptional case: insertion with the key
626 * less than least key in the leaf.
628 assert_corr(leaf->il_at == leaf->il_entries);
631 diff = PDIFF(end, start);
632 assert_corr(diff >= 0);
633 memmove(start + shift, start, diff);
635 h_used_adj(leaf, n_head(leaf), shift);
636 n_cur(leaf)->vle_keysize = cpu_to_le16(ksize);
637 n_cur(leaf)->vle_hash = cpu_to_le32(get_hash(iam_leaf_container(leaf),
639 __lvar_key_set(leaf, k);
640 __lvar_rec_set(leaf, r);
641 assert_corr(n_at_rec(leaf));
642 assert_inv(n_invariant(leaf));
645 static void lvar_rec_del(struct iam_leaf *leaf, int shift)
651 assert_corr(n_at_rec(leaf));
652 assert_inv(n_invariant(leaf));
653 assert_corr(iam_leaf_is_locked(leaf));
656 next = e_next(leaf, n_cur(leaf));
657 nob = e_size(leaf, n_cur(leaf));
658 memmove(leaf->il_at, next, end - next);
659 h_used_adj(leaf, n_head(leaf), -nob);
660 assert_inv(n_invariant(leaf));
663 static void lvar_init_new(struct iam_container *c, struct buffer_head *bh)
665 struct lvar_leaf_header *hdr;
667 hdr = (struct lvar_leaf_header *)bh->b_data;
668 hdr->vlh_magic = cpu_to_le16(IAM_LVAR_LEAF_MAGIC);
669 hdr->vlh_used = sizeof *hdr;
672 static struct lvar_leaf_entry *find_pivot(const struct iam_leaf *leaf,
673 struct lvar_leaf_entry **prev)
680 threshold = blocksize(leaf) / 2;
681 for (scan = start = n_start(leaf); scan - start <= threshold;
682 *prev = scan, scan = e_next(leaf, scan)) {
688 static void lvar_split(struct iam_leaf *leaf, struct buffer_head **bh,
691 struct lvar_leaf_entry *first_to_move;
692 struct lvar_leaf_entry *last_to_stay;
693 struct iam_path *path;
694 struct lvar_leaf_header *hdr;
695 struct buffer_head *new_leaf;
700 assert_inv(n_invariant(leaf));
701 assert_corr(iam_leaf_is_locked(leaf));
704 path = iam_leaf_path(leaf);
706 hdr = (void *)new_leaf->b_data;
708 first_to_move = find_pivot(leaf, &last_to_stay);
709 assert_corr(last_to_stay != NULL);
710 assert_corr(e_next(leaf, last_to_stay) == first_to_move);
712 hash = e_hash(first_to_move);
713 if (hash == e_hash(last_to_stay))
719 tomove = PDIFF(n_end(leaf), first_to_move);
720 memmove(hdr + 1, first_to_move, tomove);
722 h_used_adj(leaf, hdr, tomove);
723 h_used_adj(leaf, n_head(leaf), -tomove);
725 assert_corr(n_end(leaf) == first_to_move);
727 if (n_cur(leaf) >= first_to_move) {
729 * insertion point moves into new leaf.
734 shift = PDIFF(leaf->il_at, first_to_move);
736 leaf->il_bh = new_leaf;
737 leaf->il_curidx = new_blknr;
739 assert_corr(iam_leaf_is_locked(leaf));
740 result = lvar_init(leaf);
742 * init cannot fail, as node was just initialized.
744 assert_corr(result == 0);
745 leaf->il_at = ((void *)leaf->il_at) + shift;
748 * Insert pointer to the new node (together with the least key in
749 * the node) into index node.
751 iam_insert_key_lock(path, path->ip_frame, (struct iam_ikey *)&hash,
753 assert_corr(n_cur(leaf) < n_end(leaf));
754 assert_inv(n_invariant(leaf));
757 static int lvar_leaf_empty(struct iam_leaf *leaf)
759 return h_used(n_head(leaf)) == sizeof(struct lvar_leaf_header);
762 static struct iam_leaf_operations lvar_leaf_ops = {
764 .init_new = lvar_init_new,
771 .key_set = lvar_key_set,
772 .key_cmp = lvar_key_cmp,
773 .key_eq = lvar_key_eq,
774 .key_size = lvar_key_size,
775 .rec_set = lvar_rec_set,
776 .rec_eq = lvar_rec_eq,
777 .rec_get = lvar_rec_get,
778 .lookup = lvar_lookup,
779 .ilookup = lvar_ilookup,
780 .at_end = lvar_at_end,
781 .rec_add = lvar_rec_add,
782 .rec_del = lvar_rec_del,
783 .can_add = lvar_can_add,
785 .leaf_empty = lvar_leaf_empty,
793 /* This is duplicated in lustre/utils/create_iam.c */
794 /* egrep -i '^o?x?[olabcdef]*$' /usr/share/dict/words */
795 IAM_LVAR_ROOT_MAGIC = 0xb01dface
798 /* This is duplicated in lustre/utils/create_iam.c */
803 u8 vr_indirect_levels;
808 static __u32 lvar_root_ptr(struct iam_container *c)
813 static int lvar_node_init(struct iam_container *c, struct buffer_head *bh,
819 static struct iam_entry *lvar_root_inc(struct iam_container *c,
820 struct iam_path *path,
821 struct iam_frame *frame)
823 struct lvar_root *root;
824 struct iam_entry *entries;
826 assert_corr(iam_frame_is_locked(path, frame));
827 entries = frame->entries;
829 dx_set_count(entries, 2);
830 assert_corr(dx_get_limit(entries) == dx_root_limit(path));
832 root = (void *)frame->bh->b_data;
833 assert_corr(le64_to_cpu(root->vr_magic) == IAM_LVAR_ROOT_MAGIC);
834 root->vr_indirect_levels ++;
835 frame->at = entries = iam_entry_shift(path, entries, 1);
836 memset(iam_ikey_at(path, entries), 0,
837 iam_path_descr(path)->id_ikey_size);
841 static int lvar_node_check(struct iam_path *path, struct iam_frame *frame)
845 unsigned limit_correct;
846 struct iam_entry *entries;
848 entries = dx_node_get_entries(path, frame);
850 if (frame == path->ip_frames) {
851 struct lvar_root *root;
853 root = (void *)frame->bh->b_data;
854 if (le32_to_cpu(root->vr_magic) != IAM_LVAR_ROOT_MAGIC)
856 limit_correct = dx_root_limit(path);
858 limit_correct = dx_node_limit(path);
859 count = dx_get_count(entries);
860 limit = dx_get_limit(entries);
863 if (limit != limit_correct)
868 static int lvar_node_load(struct iam_path *path, struct iam_frame *frame)
870 struct iam_entry *entries;
872 entries = dx_node_get_entries(path, frame);
874 data = frame->bh->b_data;
876 if (frame == path->ip_frames) {
877 struct lvar_root *root;
881 name = kchar(path->ip_key_target);
882 path->ip_indirect = root->vr_indirect_levels;
883 if (path->ip_ikey_target == NULL) {
884 path->ip_ikey_target = iam_path_ikey(path, 4);
885 *(lvar_hash_t *)path->ip_ikey_target =
886 get_hash(path->ip_container, name,
890 frame->entries = frame->at = entries;
894 static int lvar_ikeycmp(const struct iam_container *c,
895 const struct iam_ikey *k1, const struct iam_ikey *k2)
897 lvar_hash_t p1 = le32_to_cpu(*(lvar_hash_t *)k1);
898 lvar_hash_t p2 = le32_to_cpu(*(lvar_hash_t *)k2);
900 return p1 > p2 ? +1 : (p1 < p2 ? -1 : 0);
903 static struct iam_path_descr *lvar_ipd_alloc(const struct iam_container *c,
906 return iam_ipd_alloc(area, c->ic_descr->id_ikey_size);
909 static void lvar_root(void *buf,
910 int blocksize, int keysize, int ptrsize, int recsize)
912 struct lvar_root *root;
913 struct dx_countlimit *limit;
917 isize = sizeof(lvar_hash_t) + ptrsize;
919 *root = (typeof(*root)) {
920 .vr_magic = cpu_to_le32(IAM_LVAR_ROOT_MAGIC),
921 .vr_recsize = cpu_to_le16(recsize),
922 .vr_ptrsize = cpu_to_le16(ptrsize),
923 .vr_indirect_levels = 0
926 limit = (void *)(root + 1);
927 *limit = (typeof(*limit)){
929 * limit itself + one pointer to the leaf.
931 .count = cpu_to_le16(2),
932 .limit = iam_root_limit(sizeof(struct lvar_root), blocksize,
933 sizeof (lvar_hash_t) + ptrsize)
936 /* To guarantee that the padding "keysize + ptrsize"
937 * covers the "dx_countlimit" and the "idle_blocks". */
938 LASSERT((keysize + ptrsize) >=
939 (sizeof(struct dx_countlimit) + sizeof(__u32)));
941 entry = (void *)(limit + 1);
942 /* Put "idle_blocks" just after the limit. There was padding after
943 * the limit, the "idle_blocks" re-uses part of the padding, so no
944 * compatibility issues with old layout.
951 entry = (void *)(root + 1) + isize;
954 * Entry format is <key> followed by <ptr>. In the minimal tree
955 * consisting of a root and single node, <key> is a minimal possible
958 *(lvar_hash_t *)entry = 0;
959 entry += sizeof(lvar_hash_t);
960 /* now @entry points to <ptr> */
962 *(u_int32_t *)entry = cpu_to_le32(1);
964 *(u_int64_t *)entry = cpu_to_le64(1);
967 static int lvar_esize(int namelen, int recsize)
969 return (offsetof(struct lvar_leaf_entry, vle_key) +
970 namelen + recsize + LVAR_ROUND) & ~LVAR_ROUND;
973 static void lvar_leaf(void *buf,
974 int blocksize, int keysize, int ptrsize, int recsize)
976 struct lvar_leaf_header *head;
977 struct lvar_leaf_entry *entry;
981 *head = (typeof(*head)) {
982 .vlh_magic = cpu_to_le16(IAM_LVAR_LEAF_MAGIC),
983 .vlh_used = cpu_to_le16(sizeof *head + lvar_esize(0, recsize))
985 entry = (void *)(head + 1);
986 *entry = (typeof(*entry)) {
990 memset(e_rec(entry), 0, recsize);
991 *(char *)e_rec(entry) = recsize;
994 int iam_lvar_create(struct inode *obj,
995 int keysize, int ptrsize, int recsize, handle_t *handle)
997 struct buffer_head *root_node;
998 struct buffer_head *leaf_node;
999 struct super_block *sb;
1003 unsigned long bsize;
1005 assert_corr(obj->i_size == 0);
1008 bsize = sb->s_blocksize;
1009 root_node = osd_ldiskfs_append(handle, obj, &blknr);
1010 if (IS_ERR(root_node))
1011 GOTO(out, result = PTR_ERR(root_node));
1013 leaf_node = osd_ldiskfs_append(handle, obj, &blknr);
1014 if (IS_ERR(leaf_node))
1015 GOTO(out_root, result = PTR_ERR(leaf_node));
1017 lvar_root(root_node->b_data, bsize, keysize, ptrsize, recsize);
1018 lvar_leaf(leaf_node->b_data, bsize, keysize, ptrsize, recsize);
1019 ldiskfs_mark_inode_dirty(handle, obj);
1020 result = ldiskfs_handle_dirty_metadata(handle, NULL, root_node);
1022 result = ldiskfs_handle_dirty_metadata(handle, NULL, leaf_node);
1024 ldiskfs_std_error(sb, result);
1028 GOTO(out_root, result);
1036 static struct iam_operations lvar_ops = {
1037 .id_root_ptr = lvar_root_ptr,
1038 .id_node_read = iam_node_read,
1039 .id_node_init = lvar_node_init,
1040 .id_node_check = lvar_node_check,
1041 .id_node_load = lvar_node_load,
1042 .id_ikeycmp = lvar_ikeycmp,
1043 .id_root_inc = lvar_root_inc,
1044 .id_ipd_alloc = lvar_ipd_alloc,
1045 .id_ipd_free = iam_ipd_free,
1049 static int lvar_guess(struct iam_container *c)
1052 struct buffer_head *bh;
1053 const struct lvar_root *root;
1055 assert_corr(c->ic_object != NULL);
1057 result = iam_node_read(c, lvar_root_ptr(c), NULL, &bh);
1059 root = (void *)bh->b_data;
1060 if (le32_to_cpu(root->vr_magic) == IAM_LVAR_ROOT_MAGIC) {
1061 struct iam_descr *descr;
1063 descr = c->ic_descr;
1064 descr->id_key_size = LDISKFS_NAME_LEN;
1065 descr->id_ikey_size = sizeof (lvar_hash_t);
1066 descr->id_rec_size = le16_to_cpu(root->vr_recsize);
1067 descr->id_ptr_size = le16_to_cpu(root->vr_ptrsize);
1068 descr->id_root_gap = sizeof *root;
1069 descr->id_node_gap = 0;
1070 descr->id_ops = &lvar_ops;
1071 descr->id_leaf_ops = &lvar_leaf_ops;
1082 static struct iam_format lvar_format = {
1083 .if_guess = lvar_guess
1086 void iam_lvar_format_init(void)
1088 iam_format_register(&lvar_format);