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.
161 lines
2.7 KiB
C
161 lines
2.7 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 "log.h"
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#include "metadata.h"
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#include "import-export.h"
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#include "lvm-string.h"
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/*
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* Bitsets held in the 'status' flags get
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* converted into arrays of strings.
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*/
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struct flag {
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int mask;
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char *description;
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};
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static struct flag _vg_flags[] = {
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{EXPORTED_VG, "EXPORTED"},
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{RESIZEABLE_VG, "RESIZEABLE"},
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{PARTIAL_VG, "PARTIAL"},
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{LVM_READ, "READ"},
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{LVM_WRITE, "WRITE"},
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{CLUSTERED, "CLUSTERED"},
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{SHARED, "SHARED"},
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{0, NULL}
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};
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static struct flag _pv_flags[] = {
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{ALLOCATABLE_PV, "ALLOCATABLE"},
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{EXPORTED_VG, "EXPORTED"},
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{0, NULL}
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};
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static struct flag _lv_flags[] = {
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{LVM_READ, "READ"},
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{LVM_WRITE, "WRITE"},
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{ALLOC_SIMPLE, "ALLOC_SIMPLE"},
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{ALLOC_STRICT, "ALLOC_STRICT"},
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{ALLOC_CONTIGUOUS, "ALLOC_CONTIGUOUS"},
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{FIXED_MINOR, "FIXED_MINOR"},
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{0, NULL}
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};
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static struct flag *_get_flags(int type)
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{
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switch (type) {
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case VG_FLAGS:
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return _vg_flags;
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case PV_FLAGS:
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return _pv_flags;
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case LV_FLAGS:
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return _lv_flags;
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}
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log_err("Unknown flag set requested.");
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return NULL;
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}
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static int _emit(char **buffer, size_t * size, const char *fmt, ...)
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{
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size_t n;
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va_list ap;
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va_start(ap, fmt);
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n = vsnprintf(*buffer, *size, fmt, ap);
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va_end(ap);
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if (n < 0 || (n == *size))
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return 0;
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*buffer += n;
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*size -= n;
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return 1;
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}
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/*
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* Converts a bitset to an array of string values,
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* using one of the tables defined at the top of
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* the file.
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*/
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int print_flags(uint32_t status, int type, char *buffer, size_t size)
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{
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int f, first = 1;
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struct flag *flags;
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if (!(flags = _get_flags(type))) {
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stack;
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return 0;
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}
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if (!_emit(&buffer, &size, "["))
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return 0;
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for (f = 0; flags[f].mask; f++) {
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if (status & flags[f].mask) {
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if (!first) {
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if (!_emit(&buffer, &size, ", "))
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return 0;
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} else
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first = 0;
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if (!_emit(&buffer, &size, "\"%s\"",
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flags[f].description))
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return 0;
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status &= ~flags[f].mask;
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}
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}
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if (!_emit(&buffer, &size, "]"))
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return 0;
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if (status)
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log_error("Metadata inconsistency: Not all flags successfully "
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"exported.");
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return 1;
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}
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int read_flags(uint32_t * status, int type, struct config_value *cv)
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{
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int f;
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uint32_t s = 0;
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struct flag *flags;
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if (!(flags = _get_flags(type))) {
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stack;
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return 0;
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}
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while (cv) {
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if (cv->type != CFG_STRING) {
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log_err("Status value is not a string.");
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return 0;
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}
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for (f = 0; flags[f].description; f++)
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if (!strcmp(flags[f].description, cv->v.str)) {
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s |= flags[f].mask;
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break;
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}
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if (!flags[f].description) {
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log_err("Unknown status flag '%s'.", cv->v.str);
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return 0;
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}
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cv = cv->next;
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}
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*status = s;
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return 1;
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}
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