mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +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.
476 lines
10 KiB
C
476 lines
10 KiB
C
/*
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* Copyright (C) 2001 Sistina Software
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*
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* This file is released under the GPL.
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*
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*/
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#include "tools.h"
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#include <fcntl.h>
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struct lvcreate_params {
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/* flags */
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int snapshot;
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int zero;
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int contiguous;
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int minor;
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char *origin;
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char *vg_name;
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char *lv_name;
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uint32_t stripes;
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uint32_t stripe_size;
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uint32_t chunk_size;
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/* size */
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uint32_t extents;
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uint64_t size;
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uint32_t permission;
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uint32_t read_ahead;
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int pv_count;
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char **pvs;
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};
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static int _read_name_params(struct lvcreate_params *lp,
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struct cmd_context *cmd, int *pargc, char ***pargv)
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{
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int argc = *pargc;
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char **argv = *pargv, *ptr;
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if (arg_count(cmd, name_ARG))
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lp->lv_name = arg_value(cmd, name_ARG);
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if (arg_count(cmd, snapshot_ARG)) {
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lp->snapshot = 1;
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if (!argc) {
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log_err("Please specify a logical volume to act as "
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"the snapshot origin.");
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return 0;
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}
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lp->origin = argv[0];
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(*pargv)++, (*pargc)--;
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if (!(lp->vg_name = extract_vgname(cmd, lp->origin))) {
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log_err("The origin name should include the "
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"volume group.");
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return 0;
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}
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/* Strip the volume group from the origin */
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if ((ptr = strrchr(lp->origin, (int) '/')))
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lp->origin = ptr + 1;
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} else {
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/*
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* If VG not on command line, try -n arg and then
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* environment.
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*/
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if (!argc) {
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if (!(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
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log_err("Please provide a volume group name");
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return 0;
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}
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} else {
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/*
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* Ensure lv_name doesn't contain a
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* different VG.
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*/
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if (lp->lv_name && strchr(lp->lv_name, '/')) {
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if (!(lp->vg_name =
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extract_vgname(cmd, lp->lv_name)))
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return 0;
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if (strcmp(lp->vg_name, argv[0])) {
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log_error("Inconsistent volume group "
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"names "
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"given: \"%s\" and \"%s\"",
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lp->vg_name, argv[0]);
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return 0;
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}
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}
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lp->vg_name = argv[0];
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(*pargv)++, (*pargc)--;
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}
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}
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if (lp->lv_name && (ptr = strrchr(lp->lv_name, '/')))
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lp->lv_name = ptr + 1;
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return 1;
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}
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static int _read_size_params(struct lvcreate_params *lp,
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struct cmd_context *cmd, int *pargc, char ***pargv)
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{
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/*
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* There are two mutually exclusive ways of specifying
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* the size ...
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*/
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if (arg_count(cmd, extents_ARG) && arg_count(cmd, size_ARG)) {
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log_error("Invalid combination of arguments");
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return 0;
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}
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/*
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* ... you must use one of them.
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*/
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if (arg_count(cmd, size_ARG) + arg_count(cmd, extents_ARG) == 0) {
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log_error("Please indicate size using option -l or -L");
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return 0;
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}
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if (arg_count(cmd, extents_ARG))
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lp->extents = arg_int_value(cmd, extents_ARG, 0);
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/* Size returned in kilobyte units; held in sectors */
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if (arg_count(cmd, size_ARG))
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lp->size = arg_int64_value(cmd, size_ARG, 0) * 2ull;
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return 1;
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}
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static int _read_stripe_params(struct lvcreate_params *lp,
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struct cmd_context *cmd,
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int *pargc, char ***pargv)
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{
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int argc = *pargc;
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lp->stripes = 1;
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if (arg_count(cmd, stripes_ARG)) {
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lp->stripes = arg_int_value(cmd, stripes_ARG, 1);
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if (lp->stripes == 1)
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log_print("Redundant stripes argument: default is 1");
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}
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if (arg_count(cmd, stripesize_ARG))
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lp->stripe_size = 2 * arg_int_value(cmd, stripesize_ARG, 0);
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if (lp->stripes == 1 && lp->stripe_size) {
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log_print("Ignoring stripesize argument with single stripe");
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lp->stripe_size = 0;
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}
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if (lp->stripes > 1 && !lp->stripe_size) {
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lp->stripe_size = 2 * STRIPE_SIZE_DEFAULT;
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log_print("Using default stripesize %dKB", lp->stripe_size / 2);
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}
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if (argc && argc < lp->stripes) {
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log_error("Too few physical volumes on "
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"command line for %d-way striping", lp->stripes);
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return 0;
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}
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if (lp->stripes < 1 || lp->stripes > MAX_STRIPES) {
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log_error("Number of stripes (%d) must be between %d and %d",
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lp->stripes, 1, MAX_STRIPES);
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return 0;
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}
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if (lp->stripes > 1 && (lp->stripe_size < STRIPE_SIZE_MIN ||
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lp->stripe_size > STRIPE_SIZE_MAX ||
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lp->stripe_size & (lp->stripe_size - 1))) {
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log_error("Invalid stripe size %d", lp->stripe_size);
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return 0;
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}
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return 1;
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}
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static int _read_params(struct lvcreate_params *lp, struct cmd_context *cmd,
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int argc, char **argv)
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{
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/*
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* Set the defaults.
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*/
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memset(lp, 0, sizeof(*lp));
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lp->chunk_size = 2 * arg_int_value(cmd, chunksize_ARG, 32);
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log_verbose("setting chunksize to %d sectors.", lp->chunk_size);
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if (!_read_name_params(lp, cmd, &argc, &argv) ||
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!_read_size_params(lp, cmd, &argc, &argv) ||
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!_read_stripe_params(lp, cmd, &argc, &argv))
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return 0;
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/*
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* Should we zero the lv.
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*/
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lp->zero = strcmp(arg_str_value(cmd, zero_ARG, "y"), "n");
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/*
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* Contiguous ?
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*/
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lp->contiguous = strcmp(arg_str_value(cmd, contiguous_ARG, "n"), "n");
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/*
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* Read ahead.
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*/
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if (arg_count(cmd, readahead_ARG))
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lp->read_ahead = arg_int_value(cmd, readahead_ARG, 0);
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/*
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* Permissions.
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*/
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if (arg_count(cmd, permission_ARG))
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lp->permission = arg_int_value(cmd, permission_ARG, 0);
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else
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lp->permission = LVM_READ | LVM_WRITE;
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lp->minor = arg_int_value(cmd, minor_ARG, -1);
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/* Persistent minor */
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if (arg_count(cmd, persistent_ARG)) {
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if (!strcmp(arg_str_value(cmd, persistent_ARG, "n"), "y")) {
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if (lp->minor == -1) {
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log_error("Please specify minor number with "
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"--minor when using -My");
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return 0;
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}
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} else {
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if (lp->minor != -1) {
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log_error("--minor not possible with -Mn");
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return 0;
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}
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}
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}
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lp->pv_count = argc;
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lp->pvs = argv;
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return 1;
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}
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/*
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* Volumes may be zeroed to remove old application data.
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*/
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static int _zero_lv(struct cmd_context *cmd, struct logical_volume *lv)
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{
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struct device *dev;
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char *name;
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/*
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* FIXME:
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* <clausen> also, more than 4k
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* <clausen> say, reiserfs puts it's superblock 32k in, IIRC
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* <ejt_> k, I'll drop a fixme to that effect
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* (I know the device is at least 4k, but not 32k)
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*/
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if (!(name = pool_alloc(cmd->mem, PATH_MAX))) {
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log_error("Name allocation failed - device not zeroed");
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return 0;
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}
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if (lvm_snprintf(name, PATH_MAX, "%s%s/%s", cmd->dev_dir,
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lv->vg->name, lv->name) < 0) {
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log_error("Name too long - device not zeroed (%s)", lv->name);
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return 0;
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}
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log_verbose("Zeroing start of logical volume \"%s\"", lv->name);
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if (!(dev = dev_cache_get(name, NULL))) {
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log_error("%s: not found: device not zeroed", name);
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return 0;
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}
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if (!(dev_open(dev, O_WRONLY)))
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return 0;
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dev_zero(dev, 0, 4096);
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dev_close(dev);
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return 1;
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}
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static int _lvcreate(struct cmd_context *cmd, struct lvcreate_params *lp)
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{
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uint32_t size_rest;
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uint32_t status = 0;
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struct volume_group *vg;
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struct logical_volume *lv, *org;
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struct list *pvh;
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if (lp->contiguous)
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status |= ALLOC_CONTIGUOUS;
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else
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status |= ALLOC_SIMPLE;
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status |= lp->permission;
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/* does VG exist? */
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log_verbose("Finding volume group \"%s\"", lp->vg_name);
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if (!(vg = vg_read(cmd, lp->vg_name))) {
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log_error("Volume group \"%s\" doesn't exist", lp->vg_name);
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return 0;
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}
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if (vg->status & EXPORTED_VG) {
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log_error("Volume group \"%s\" is exported", lp->vg_name);
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return 0;
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}
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if (!(vg->status & LVM_WRITE)) {
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log_error("Volume group \"%s\" is read-only", lp->vg_name);
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return 0;
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}
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if (lp->lv_name && find_lv_in_vg(vg, lp->lv_name)) {
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log_error("Logical volume \"%s\" already exists in "
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"volume group \"%s\"", lp->lv_name, lp->vg_name);
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return 0;
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}
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/*
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* Create the pv list.
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*/
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if (lp->pv_count) {
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if (!(pvh = create_pv_list(cmd->mem, vg,
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lp->pv_count, lp->pvs))) {
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stack;
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return 0;
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}
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} else
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pvh = &vg->pvs;
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if (lp->stripe_size > vg->extent_size) {
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log_error("Setting stripe size %d KB to physical extent "
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"size %u KB", lp->stripe_size / 2,
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vg->extent_size / 2);
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lp->stripe_size = vg->extent_size;
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}
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if (lp->size) {
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/* No of 512-byte sectors */
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lp->extents = lp->size;
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if (lp->extents % vg->extent_size) {
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char *s1;
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lp->extents += vg->extent_size - lp->extents %
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vg->extent_size;
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log_print("Rounding up size to full physical "
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"extent %s",
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(s1 = display_size(lp->extents / 2,
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SIZE_SHORT)));
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dbg_free(s1);
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}
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lp->extents /= vg->extent_size;
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}
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if ((size_rest = lp->extents % lp->stripes)) {
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log_print("Rounding size (%d extents) up to stripe boundary "
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"size (%d extents)", lp->extents,
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lp->extents - size_rest + lp->stripes);
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lp->extents = lp->extents - size_rest + lp->stripes;
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}
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if (lp->snapshot && !(org = find_lv(vg, lp->origin))) {
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log_err("Couldn't find origin volume '%s'.", lp->origin);
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return 0;
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}
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if (!(lv = lv_create(vg->fid, lp->lv_name, status,
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lp->stripes, lp->stripe_size, lp->extents,
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vg, pvh))) return 0;
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if (lp->read_ahead) {
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log_verbose("Setting read ahead sectors");
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lv->read_ahead = lp->read_ahead;
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}
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if (lp->minor >= 0) {
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lv->minor = lp->minor;
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lv->status |= FIXED_MINOR;
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log_verbose("Setting minor number to %d", lv->minor);
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}
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if (!archive(vg))
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return 0;
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/* store vg on disk(s) */
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if (!vg_write(vg))
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return 0;
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_ACTIVATE))
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return 0;
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if (lp->zero || lp->snapshot)
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_zero_lv(cmd, lv);
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else
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log_print("WARNING: \"%s\" not zeroed", lv->name);
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if (lp->snapshot) {
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_DEACTIVATE)) {
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log_err("Couldn't unlock snapshot.");
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return 0;
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}
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if (!lock_vol(cmd, org->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
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log_error("Failed to lock origin %s", org->name);
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return 0;
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}
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if (!vg_add_snapshot(org, lv, 1, lp->chunk_size)) {
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log_err("Couldn't create snapshot.");
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return 0;
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}
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/* store vg on disk(s) */
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if (!vg_write(vg))
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return 0;
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if (!unlock_lv(cmd, org->lvid.s)) {
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log_error("Problem reactivating origin %s", org->name);
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return 0;
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}
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}
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backup(vg);
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log_print("Logical volume \"%s\" created", lv->name);
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/*
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* FIXME: as a sanity check we could try reading the
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* last block of the device ?
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*/
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return 1;
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}
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int lvcreate(struct cmd_context *cmd, int argc, char **argv)
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{
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int r = ECMD_FAILED;
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struct lvcreate_params lp;
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memset(&lp, 0, sizeof(lp));
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if (!_read_params(&lp, cmd, argc, argv))
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return -EINVALID_CMD_LINE;
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if (!lock_vol(cmd, lp.vg_name, LCK_VG_WRITE)) {
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log_error("Can't get lock for %s", lp.vg_name);
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return 0;
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}
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if (!_lvcreate(cmd, &lp)) {
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stack;
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goto out;
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}
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r = 0;
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out:
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unlock_vg(cmd, lp.vg_name);
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return r;
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}
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