mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
25b733809a
Lots of changes/very little testing so far => there'll be bugs!
Use 'vgcreate -M text' to create a volume group with its metadata stored
in text files. Text format metadata changes should be reasonably atomic,
with a (basic) automatic recovery mechanism if the system crashes while a
change is in progress.
Add a metadata section to lvm.conf to specify multiple directories if
you want (recommended) to keep multiple copies of the metadata (eg on
different filesystems).
e.g. metadata {
dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"]
}
Plenty of refinements still in the pipeline.
110 lines
1.5 KiB
C
110 lines
1.5 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#include "ttree.h"
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#include "pool.h"
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#include "log.h"
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struct node {
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unsigned k;
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struct node *l, *m, *r;
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void *data;
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};
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struct ttree {
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int klen;
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struct pool *mem;
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struct node *root;
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};
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struct node **_lookup_single(struct node **c, unsigned int k)
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{
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while (*c) {
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if (k < (*c)->k)
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c = &((*c)->l);
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else if (k > (*c)->k)
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c = &((*c)->r);
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else {
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c = &((*c)->m);
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break;
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}
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}
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return c;
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}
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void *ttree_lookup(struct ttree *tt, unsigned *key)
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{
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struct node **c = &tt->root;
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int count = tt->klen;
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while (*c && count) {
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c = _lookup_single(c, *key++);
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count--;
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}
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return *c ? (*c)->data : NULL;
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}
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static struct node *_node(struct pool *mem, unsigned int k)
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{
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struct node *n = pool_zalloc(mem, sizeof(*n));
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if (n)
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n->k = k;
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return n;
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}
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int ttree_insert(struct ttree *tt, unsigned int *key, void *data)
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{
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struct node **c = &tt->root;
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int count = tt->klen;
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unsigned int k;
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do {
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k = *key++;
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c = _lookup_single(c, k);
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count--;
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} while (*c && count);
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if (!*c) {
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count++;
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while (count--) {
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if (!(*c = _node(tt->mem, k))) {
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stack;
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return 0;
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}
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k = *key++;
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if (count)
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c = &((*c)->m);
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}
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}
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(*c)->data = data;
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return 1;
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}
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struct ttree *ttree_create(struct pool *mem, unsigned int klen)
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{
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struct ttree *tt;
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if (!(tt = pool_zalloc(mem, sizeof(*tt)))) {
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stack;
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return NULL;
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}
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tt->klen = klen;
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tt->mem = mem;
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return tt;
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}
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