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/*
* Copyright (C) 2002 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#include "ll-activate.h"
#include "lvm-string.h"
#include "log.h"
#include <libdevmapper.h>
/*
* Emit a target for a given segment.
* FIXME: tidy this function.
*/
static int _emit_target(struct dm_task *dmt, struct stripe_segment *seg)
{
char params[1024];
uint64_t esize = seg->lv->vg->extent_size;
uint32_t s, stripes = seg->stripes;
int w = 0, tw = 0, error = 0;
const char *no_space =
"Insufficient space to write target parameters.";
char *filler = "/dev/ioerror";
char *target;
if (stripes == 1) {
if (!seg->area[0].pv) {
target = "error";
error = 1;
}
else
target = "linear";
}
if (stripes > 1) {
target = "striped";
tw = lvm_snprintf(params, sizeof(params), "%u %u ",
stripes, seg->stripe_size);
if (tw < 0) {
log_err(no_space);
return 0;
}
w = tw;
}
if (!error) {
for (s = 0; s < stripes; s++, w += tw) {
if (!seg->area[s].pv)
tw = lvm_snprintf(
params + w, sizeof(params) - w,
"%s 0%s", filler,
s == (stripes - 1) ? "" : " ");
else
tw = lvm_snprintf(
params + w, sizeof(params) - w,
"%s %" PRIu64 "%s",
dev_name(seg->area[s].pv->dev),
(seg->area[s].pv->pe_start +
(esize * seg->area[s].pe)),
s == (stripes - 1) ? "" : " ");
if (tw < 0) {
log_err(no_space);
return 0;
}
}
}
log_very_verbose("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
esize * seg->le, esize * seg->len,
target, params);
if (!dm_task_add_target(dmt, esize * seg->le, esize * seg->len,
target, params)) {
stack;
return 0;
}
return 1;
}
int device_populate_lv(struct dm_task *dmt, struct logical_volume *lv)
{
struct list *segh;
struct stripe_segment *seg;
log_very_verbose("Generating devmapper table for %s", lv->name);
list_iterate(segh, &lv->segments) {
seg = list_item(segh, struct stripe_segment);
if (!_emit_target(dmt, seg)) {
log_error("Unable to build table for '%s'", lv->name);
return 0;
}
}
return 1;
}
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