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lvm2/tools/lvcreate.c

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/*
* Copyright (C) 2001 Sistina Software
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*
* This file is released under the GPL.
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*
*/
#include "tools.h"
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#include <fcntl.h>
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struct lvcreate_params {
/* flags */
int snapshot;
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int zero;
int contiguous;
int minor;
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char *origin;
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char *vg_name;
char *lv_name;
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uint32_t stripes;
uint32_t stripe_size;
uint32_t chunk_size;
/* size */
uint32_t extents;
uint64_t size;
uint32_t permission;
uint32_t read_ahead;
int pv_count;
char **pvs;
};
static int _read_name_params(struct lvcreate_params *lp,
struct cmd_context *cmd,
int *pargc, char ***pargv)
{
int argc = *pargc;
char **argv = *pargv, *ptr;
if (arg_count(cmd, name_ARG))
lp->lv_name = arg_value(cmd, name_ARG);
if (arg_count(cmd, snapshot_ARG)) {
lp->snapshot = 1;
if (!argc) {
log_err("Please specify a logical volume to act as "
"the snapshot origin.");
return 0;
}
lp->origin = argv[0];
(*pargv)++, (*pargc)--;
if (!(lp->vg_name = extract_vgname(cmd->fid, lp->origin))) {
log_err("The origin name should include the "
"volume group.");
return 0;
}
/* Strip the volume group from the origin */
if ((ptr = strrchr(lp->origin, (int) '/')))
lp->origin = ptr + 1;
} else {
/*
* If VG not on command line, try -n arg and then
* environment.
*/
if (!argc) {
if (!(lp->vg_name =
extract_vgname(cmd->fid, lp->lv_name))) {
log_err("Please provide a volume group name");
return 0;
}
} else {
/*
* Ensure lv_name doesn't contain a
* different VG.
*/
if (lp->lv_name && strchr(lp->lv_name, '/')) {
if (!(lp->vg_name =
extract_vgname(cmd->fid, lp->lv_name)))
return 0;
if (strcmp(lp->vg_name, argv[0])) {
log_error("Inconsistent volume group "
"names "
"given: \"%s\" and \"%s\"",
lp->vg_name, argv[0]);
return 0;
}
}
lp->vg_name = argv[0];
(*pargv)++, (*pargc)--;
}
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}
if (lp->lv_name && (ptr = strrchr(lp->lv_name, '/')))
lp->lv_name = ptr + 1;
return 1;
}
static int _read_size_params(struct lvcreate_params *lp,
struct cmd_context *cmd,
int *pargc, char ***pargv)
{
/*
* There are two mutually exclusive ways of specifying
* the size ...
*/
if (arg_count(cmd, extents_ARG) && arg_count(cmd, size_ARG)) {
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log_error("Invalid combination of arguments");
return 0;
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}
/*
* ... you must use one of them.
*/
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");
return 0;
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}
if (arg_count(cmd, extents_ARG))
lp->extents = arg_int_value(cmd, extents_ARG, 0);
/* Size returned in kilobyte units; held in sectors */
if (arg_count(cmd, size_ARG))
lp->size = arg_int64_value(cmd, size_ARG, 0) * 2ull;
return 1;
}
static int _read_stripe_params(struct lvcreate_params *lp,
struct cmd_context *cmd,
int *pargc, char ***pargv)
{
int argc = *pargc;
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lp->stripes = 1;
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if (arg_count(cmd, stripes_ARG)) {
lp->stripes = arg_int_value(cmd, stripes_ARG, 1);
if (lp->stripes == 1)
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log_print("Redundant stripes argument: default is 1");
}
if (arg_count(cmd, stripesize_ARG))
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");
lp->stripe_size = 0;
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}
if (lp->stripes > 1 && !lp->stripe_size) {
lp->stripe_size = 2 * STRIPE_SIZE_DEFAULT;
log_print("Using default stripesize %dKB",
lp->stripe_size / 2);
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}
if (argc && argc < lp->stripes) {
log_error("Too few physical volumes on "
"command line for %d-way striping", lp->stripes);
return 0;
}
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if (lp->stripes < 1 || lp->stripes > MAX_STRIPES) {
log_error("Number of stripes (%d) must be between %d and %d",
lp->stripes, 1, MAX_STRIPES);
return 0;
}
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if (lp->stripes > 1 && (lp->stripe_size < STRIPE_SIZE_MIN ||
lp->stripe_size > STRIPE_SIZE_MAX ||
lp->stripe_size & (lp->stripe_size - 1))) {
log_error("Invalid stripe size %d", lp->stripe_size);
return 0;
}
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return 1;
}
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static int _read_params(struct lvcreate_params *lp, struct cmd_context *cmd,
int argc, char **argv)
{
/*
* Set the defaults.
*/
memset(lp, 0, sizeof(*lp));
lp->chunk_size = 256;
if (!_read_name_params(lp, cmd, &argc, &argv) ||
!_read_size_params(lp, cmd, &argc, &argv) ||
!_read_stripe_params(lp, cmd, &argc, &argv))
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return 0;
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/*
* Should we zero the lv.
*/
lp->zero = strcmp(arg_str_value(cmd, zero_ARG, "y"), "n");
/*
* Contiguous ?
*/
lp->contiguous = strcmp(arg_str_value(cmd, contiguous_ARG, "n"), "n");
/*
* Read ahead.
*/
if (arg_count(cmd, readahead_ARG))
lp->read_ahead = arg_int_value(cmd, readahead_ARG, 0);
/*
* Permissions.
*/
if (arg_count(cmd, permission_ARG))
lp->permission = arg_int_value(cmd, permission_ARG, 0);
else
lp->permission = LVM_READ | LVM_WRITE;
lp->minor = arg_int_value(cmd, minor_ARG, -1);
/* Persistent minor */
if (arg_count(cmd, persistent_ARG)) {
if (!strcmp(arg_str_value(cmd, persistent_ARG, "n"), "y")) {
if (lp->minor == -1) {
log_error("Please specify minor number with "
"--minor when using -My");
return 0;
}
} else {
if (lp->minor != -1) {
log_error("--minor not possible with -Mn");
return 0;
}
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}
}
lp->pv_count = argc;
lp->pvs = argv;
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return 1;
}
static int _lvcreate(struct cmd_context *cmd, struct lvcreate_params *lp,
struct logical_volume **plv)
{
uint32_t size_rest;
uint32_t status = 0;
struct volume_group *vg;
struct logical_volume *lv, *org;
struct list *pvh;
*plv = NULL;
if (lp->contiguous)
status |= ALLOC_CONTIGUOUS;
else
status |= ALLOC_SIMPLE;
status |= lp->permission;
/* does VG exist? */
log_verbose("Finding volume group \"%s\"", lp->vg_name);
if (!(vg = cmd->fid->ops->vg_read(cmd->fid, lp->vg_name))) {
log_error("Volume group \"%s\" doesn't exist", lp->vg_name);
return 0;
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}
if (vg->status & EXPORTED_VG) {
log_error("Volume group \"%s\" is exported", lp->vg_name);
return 0;
}
if (!(vg->status & LVM_WRITE)) {
log_error("Volume group \"%s\" is read-only", lp->vg_name);
return 0;
}
if (lp->lv_name && find_lv_in_vg(vg, lp->lv_name)) {
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log_error("Logical volume \"%s\" already exists in "
"volume group \"%s\"", lp->lv_name, lp->vg_name);
return 0;
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}
/*
* Create the pv list.
*/
if (lp->pv_count) {
if (!(pvh = create_pv_list(cmd->mem, vg,
lp->pv_count, lp->pvs))) {
stack;
return 0;
}
} else
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 "
"size %u KB", lp->stripe_size / 2,
vg->extent_size / 2);
lp->stripe_size = vg->extent_size;
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}
if (lp->size) {
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/* No of 512-byte sectors */
lp->extents = lp->size;
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if (lp->extents % vg->extent_size) {
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char *s1;
lp->extents += vg->extent_size - lp->extents %
vg->extent_size;
log_print("Rounding up size to full physical "
"extent %s",
(s1 = display_size(lp->extents / 2,
SIZE_SHORT)));
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dbg_free(s1);
}
lp->extents /= vg->extent_size;
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}
if ((size_rest = lp->extents % lp->stripes)) {
log_print("Rounding size (%d extents) up to stripe boundary "
"size (%d extents)", lp->extents,
lp->extents - size_rest + lp->stripes);
lp->extents = lp->extents - size_rest + lp->stripes;
}
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if (lp->snapshot && !(org = find_lv(vg, lp->origin))) {
log_err("Couldn't find origin volume '%s'.", lp->origin);
return 0;
}
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if (!archive(vg))
return 0;
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if (!(lv = lv_create(cmd->fid, lp->lv_name, status,
lp->stripes, lp->stripe_size, lp->extents,
vg, pvh)))
return 0;
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if (lp->snapshot && !vg_add_snapshot(org, lv, 1, lp->chunk_size)) {
log_err("Couldn't create snapshot.");
return 0;
}
if (lp->read_ahead) {
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log_verbose("Setting read ahead sectors");
lv->read_ahead = lp->read_ahead;
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}
if (lp->minor >= 0) {
lv->minor = lp->minor;
lv->status |= FIXED_MINOR;
log_verbose("Setting minor number to %d", lv->minor);
}
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/* store vg on disk(s) */
if (!cmd->fid->ops->vg_write(cmd->fid, vg))
return 0;
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backup(vg);
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log_print("Logical volume \"%s\" created", lv->name);
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*plv = lv;
return 1;
}
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/*
* Non-snapshot volumes may be zeroed to remove old filesystems.
*/
static int _zero(struct cmd_context *cmd, struct logical_volume *lv)
{
struct device *dev;
char *name;
/*
* FIXME:
* <clausen> also, more than 4k
* <clausen> say, reiserfs puts it's superblock 32k in, IIRC
* <ejt_> k, I'll drop a fixme to that effect
* (I know the device is at least 4k, but not 32k)
*/
if (!(name = pool_alloc(cmd->mem, PATH_MAX))) {
log_error("Name allocation failed - device not zeroed");
return 0;
}
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if (lvm_snprintf(name, PATH_MAX, "%s%s/%s", cmd->dev_dir,
lv->vg->name, lv->name) < 0) {
log_error("Name too long - device not zeroed (%s)",
lv->name);
return 0;
}
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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))) {
log_error("\"%s\" not found: device not zeroed", name);
return 0;
}
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if (!(dev_open(dev, O_WRONLY)))
return 0;
dev_zero(dev, 0, 4096);
dev_close(dev);
return 1;
}
int lvcreate(struct cmd_context *cmd, int argc, char **argv)
{
int r = ECMD_FAILED;
struct lvcreate_params lp;
struct logical_volume *lv;
memset(&lp, 0, sizeof(lp));
if (!_read_params(&lp, cmd, argc, argv))
return -EINVALID_CMD_LINE;
if (!lock_vol(cmd, lp.vg_name, LCK_VG | LCK_WRITE)) {
log_error("Can't get lock for %s", lp.vg_name);
return 0;
}
if (!_lvcreate(cmd, &lp, &lv)) {
stack;
goto out;
}
if (!lp.snapshot && !lv_setup_cow_store(lv)) {
stack;
goto out;
}
if (!lv_activate(lv))
goto out;
if (!lp.snapshot) {
if (!lp.zero)
log_print("WARNING: \"%s\" not zeroed", lv->name);
else if (!_zero(cmd, lv)) {
stack;
goto out;
}
}
/*
* FIXME: as a sanity check we could try reading the
* last block of the device ?
*/
r = 0;
out:
lock_vol(cmd, lp.vg_name, LCK_VG | LCK_NONE);
return r;
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}