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lvm2/lib/thin/thin.c
2011-10-17 14:17:30 +00:00

479 lines
13 KiB
C

/*
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "toolcontext.h"
#include "metadata.h"
#include "segtype.h"
#include "text_export.h"
#include "text_import.h"
#include "config.h"
#include "activate.h"
#include "str_list.h"
#ifdef DMEVENTD
# include "sharedlib.h"
# include "libdevmapper-event.h"
#endif
/* Dm kernel module name for thin provisiong */
#define THIN_MODULE "thin-pool"
/*
* Macro used as return argument - returns 0.
* return is left to be written in the function for better readability.
*/
#define SEG_LOG_ERROR(t, p...) \
log_error(t " segment %s of logical volume %s.", ## p, \
dm_config_parent_name(sn), seg->lv->name), 0;
static const char *_thin_pool_name(const struct lv_segment *seg)
{
return seg->segtype->name;
}
static int _thin_pool_add_message(struct lv_segment *seg,
const char *key,
const struct dm_config_node *sn)
{
const char *lv_name = NULL;
struct logical_volume *lv = NULL;
uint32_t device_id = 0;
dm_thin_message_t type;
/* Message must have only one from: create, trim, delete */
if (dm_config_get_str(sn, "create", &lv_name)) {
if (!(lv = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown LV %s for create message in",
lv_name);
/* FIXME: switch to _SNAP later, if the created LV has an origin */
type = DM_THIN_MESSAGE_CREATE_THIN;
}
if (dm_config_get_str(sn, "trim", &lv_name)) {
if (lv)
return SEG_LOG_ERROR("Unsupported message format in");
if (!(lv = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown LV %s for trim message in",
lv_name);
type = DM_THIN_MESSAGE_TRIM;
}
if (!dm_config_get_uint32(sn, "delete", &device_id)) {
if (!lv)
return SEG_LOG_ERROR("Unknown message in");
} else {
if (lv)
return SEG_LOG_ERROR("Unsupported message format in");
type = DM_THIN_MESSAGE_DELETE;
}
if (!attach_pool_message(seg, type, lv, device_id, 1))
return_0;
return 1;
}
static int _thin_pool_text_import(struct lv_segment *seg,
const struct dm_config_node *sn,
struct dm_hash_table *pv_hash __attribute__((unused)))
{
const char *lv_name;
struct logical_volume *pool_data_lv, *pool_metadata_lv;
if (!dm_config_get_str(sn, "pool", &lv_name))
return SEG_LOG_ERROR("Pool must be a string in");
if (!(pool_data_lv = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown pool %s in", lv_name);
if (!dm_config_get_str(sn, "metadata", &lv_name))
return SEG_LOG_ERROR("Metadata must be a string in");
if (!(pool_metadata_lv = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown metadata %s in", lv_name);
if (!attach_pool_data_lv(seg, pool_data_lv))
return_0;
if (!attach_pool_metadata_lv(seg, pool_metadata_lv))
return_0;
if (!dm_config_get_uint64(sn, "transaction_id", &seg->transaction_id))
return SEG_LOG_ERROR("Could not read transaction_id for");
if (!dm_config_get_uint64(sn, "low_water_mark", &seg->low_water_mark))
return SEG_LOG_ERROR("Could not read low_water_mark");
if (!dm_config_get_uint32(sn, "data_block_size", &seg->data_block_size))
return SEG_LOG_ERROR("Could not read data_block_size");
if ((seg->data_block_size < DM_THIN_MIN_DATA_SIZE) ||
(seg->data_block_size > DM_THIN_MAX_DATA_SIZE))
return SEG_LOG_ERROR("Unsupported value %u for data_block_size",
seg->device_id);
if (dm_config_has_node(sn, "zero_new_blocks") &&
!dm_config_get_uint32(sn, "zero_new_blocks", &seg->zero_new_blocks))
return SEG_LOG_ERROR("Could not read zero_new_blocks for");
seg->lv->status |= THIN_POOL;
/* Read messages */
for (; sn; sn = sn->sib)
if (!(sn->v) && !_thin_pool_add_message(seg, sn->key, sn->child))
return_0;
return 1;
}
static int _thin_pool_text_import_area_count(const struct dm_config_node *sn,
uint32_t *area_count)
{
*area_count = 1;
return 1;
}
static int _thin_pool_text_export(const struct lv_segment *seg, struct formatter *f)
{
unsigned cnt = 0;
struct lv_thin_message *tmsg;
outf(f, "pool = \"%s\"", seg_lv(seg, 0)->name);
outf(f, "metadata = \"%s\"", seg->pool_metadata_lv->name);
outf(f, "transaction_id = %" PRIu64, seg->transaction_id);
outf(f, "low_water_mark = %" PRIu64, seg->low_water_mark);
outf(f, "data_block_size = %d", seg->data_block_size);
if (seg->zero_new_blocks)
outf(f, "zero_new_blocks = 1");
dm_list_iterate_items(tmsg, &seg->thin_messages) {
/* Extra validation */
switch (tmsg->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
case DM_THIN_MESSAGE_CREATE_THIN:
case DM_THIN_MESSAGE_TRIM:
if (!lv_is_thin_volume(tmsg->u.lv)) {
log_error(INTERNAL_ERROR
"LV %s is not a thin volume.",
tmsg->u.lv->name);
return 0;
}
break;
default:
break;
}
if (!cnt)
outnl(f);
outf(f, "message%d {", ++cnt);
out_inc_indent(f);
switch (tmsg->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
case DM_THIN_MESSAGE_CREATE_THIN:
outf(f, "create = \"%s\"", tmsg->u.lv->name);
break;
case DM_THIN_MESSAGE_TRIM:
outf(f, "trim = \"%s\"", tmsg->u.lv->name);
break;
case DM_THIN_MESSAGE_DELETE:
outf(f, "delete = %d", tmsg->u.delete_id);
break;
default:
log_error(INTERNAL_ERROR "Passed unsupported message.");
return 0;
}
out_dec_indent(f);
outf(f, "}");
}
return 1;
}
#ifdef DEVMAPPER_SUPPORT
static int _thin_pool_add_target_line(struct dev_manager *dm,
struct dm_pool *mem __attribute__((unused)),
struct cmd_context *cmd __attribute__((unused)),
void **target_state __attribute__((unused)),
struct lv_segment *seg,
const struct lv_activate_opts *laopts __attribute__((unused)),
struct dm_tree_node *node, uint64_t len,
uint32_t *pvmove_mirror_count __attribute__((unused)))
{
char *metadata_dlid, *pool_dlid;
struct lv_thin_message *lmsg;
struct dm_thin_message dmsg;
if (!(metadata_dlid = build_dm_uuid(mem, seg->pool_metadata_lv->lvid.s, NULL))) {
log_error("Failed to build uuid for metadata LV %s.",
seg->pool_metadata_lv->name);
return 0;
}
if (!(pool_dlid = build_dm_uuid(mem, seg_lv(seg, 0)->lvid.s, NULL))) {
log_error("Failed to build uuid for pool LV %s.",
seg_lv(seg, 0)->name);
return 0;
}
if (!dm_tree_node_add_thin_pool_target(node, len, seg->transaction_id,
metadata_dlid, pool_dlid,
seg->data_block_size, seg->low_water_mark,
seg->zero_new_blocks ? 0 : 1))
return_0;
if (!dm_list_empty(&seg->thin_messages)) {
dm_list_iterate_items(lmsg, &seg->thin_messages) {
dmsg.type = lmsg->type;
switch (lmsg->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
/* FIXME: to be implemented */
log_debug("Thin pool create_snap %s.", lmsg->u.lv->name);
dmsg.u.m_create_snap.device_id = first_seg(lmsg->u.lv)->device_id;
dmsg.u.m_create_snap.origin_id = 0;//first_seg(first_seg(lmsg->u.lv)->origin)->device_id;
if (!dm_tree_node_add_thin_pool_message(node, &dmsg))
return_0;
log_error(INTERNAL_ERROR "Sorry, not implemented yet.");
return 0;
case DM_THIN_MESSAGE_CREATE_THIN:
log_debug("Thin pool create_thin %s.", lmsg->u.lv->name);
dmsg.u.m_create_thin.device_id = first_seg(lmsg->u.lv)->device_id;
if (!dm_tree_node_add_thin_pool_message(node, &dmsg))
return_0;
break;
case DM_THIN_MESSAGE_DELETE:
log_debug("Thin pool delete %u.", lmsg->u.delete_id);
dmsg.u.m_delete.device_id = lmsg->u.delete_id;
if (!dm_tree_node_add_thin_pool_message(node, &dmsg))
return_0;
break;
case DM_THIN_MESSAGE_TRIM:
/* FIXME: to be implemented */
log_error(INTERNAL_ERROR "Sorry, not implemented yet.");
return 0;
default:
log_error(INTERNAL_ERROR "Unsupported message.");
return 0;
}
}
log_debug("Thin pool set_transaction_id %" PRIu64 ".", seg->transaction_id);
dmsg.type = DM_THIN_MESSAGE_SET_TRANSACTION_ID;
dmsg.u.m_set_transaction_id.current_id = seg->transaction_id - 1;
dmsg.u.m_set_transaction_id.new_id = seg->transaction_id;
if (!dm_tree_node_add_thin_pool_message(node, &dmsg))
return_0;
}
return 1;
}
#endif
static const char *_thin_name(const struct lv_segment *seg)
{
return seg->segtype->name;
}
static int _thin_text_import(struct lv_segment *seg,
const struct dm_config_node *sn,
struct dm_hash_table *pv_hash __attribute__((unused)))
{
const char *lv_name;
struct logical_volume *pool_lv;
if (!dm_config_get_str(sn, "thin_pool", &lv_name))
return SEG_LOG_ERROR("Thin pool must be a string in");
if (!(pool_lv = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown thin pool %s in", lv_name);
if (!attach_pool_lv(seg, pool_lv))
return_0;
if (dm_config_has_node(sn, "origin")) {
if (!dm_config_get_str(sn, "origin", &lv_name))
return SEG_LOG_ERROR("Origin must be a string in");
if (!(seg->origin = find_lv(seg->lv->vg, lv_name)))
return SEG_LOG_ERROR("Unknown origin %s in", lv_name);
}
if (!dm_config_get_uint32(sn, "device_id", &seg->device_id))
return SEG_LOG_ERROR("Could not read device_id for");
if (seg->device_id > DM_THIN_MAX_DEVICE_ID)
return SEG_LOG_ERROR("Unsupported value %u for device_id",
seg->device_id);
return 1;
}
static int _thin_text_export(const struct lv_segment *seg, struct formatter *f)
{
outf(f, "thin_pool = \"%s\"", seg->pool_lv->name);
outf(f, "device_id = %d", seg->device_id);
if (seg->origin)
outf(f, "origin = \"%s\"", seg->origin->name);
return 1;
}
#ifdef DEVMAPPER_SUPPORT
static int _thin_add_target_line(struct dev_manager *dm,
struct dm_pool *mem __attribute__((unused)),
struct cmd_context *cmd __attribute__((unused)),
void **target_state __attribute__((unused)),
struct lv_segment *seg,
const struct lv_activate_opts *laopts __attribute__((unused)),
struct dm_tree_node *node, uint64_t len,
uint32_t *pvmove_mirror_count __attribute__((unused)))
{
char *thin_pool_dlid;
if (!(thin_pool_dlid = build_dm_uuid(mem, seg->pool_lv->lvid.s, NULL))) {
log_error("Failed to build uuid for thin pool LV %s.", seg->pool_lv->name);
return 0;
}
if (!dm_tree_node_add_thin_target(node, len, thin_pool_dlid, seg->device_id))
return_0;
return 1;
}
static int _thin_target_percent(void **target_state __attribute__((unused)),
percent_t *percent,
struct dm_pool *mem __attribute__((unused)),
struct cmd_context *cmd __attribute__((unused)),
struct lv_segment *seg __attribute__((unused)),
char *params, uint64_t *total_numerator,
uint64_t *total_denominator)
{
return 1;
}
static int _thin_target_present(struct cmd_context *cmd,
const struct lv_segment *seg,
unsigned *attributes __attribute__((unused)))
{
static int _checked = 0;
static int _present = 0;
if (!_checked) {
_present = target_present(cmd, THIN_MODULE, 1);
_checked = 1;
}
return _present;
}
#endif
static int _thin_modules_needed(struct dm_pool *mem,
const struct lv_segment *seg __attribute__((unused)),
struct dm_list *modules)
{
if (!str_list_add(mem, modules, THIN_MODULE)) {
log_error("thin string list allocation failed");
return 0;
}
return 1;
}
static void _thin_destroy(struct segment_type *segtype)
{
dm_free(segtype);
}
static struct segtype_handler _thin_pool_ops = {
.name = _thin_pool_name,
.text_import = _thin_pool_text_import,
.text_import_area_count = _thin_pool_text_import_area_count,
.text_export = _thin_pool_text_export,
#ifdef DEVMAPPER_SUPPORT
.add_target_line = _thin_pool_add_target_line,
.target_present = _thin_target_present,
#endif
.modules_needed = _thin_modules_needed,
.destroy = _thin_destroy,
};
static struct segtype_handler _thin_ops = {
.name = _thin_name,
.text_import = _thin_text_import,
.text_export = _thin_text_export,
#ifdef DEVMAPPER_SUPPORT
.add_target_line = _thin_add_target_line,
.target_percent = _thin_target_percent,
.target_present = _thin_target_present,
#endif
.modules_needed = _thin_modules_needed,
.destroy = _thin_destroy,
};
#ifdef THIN_INTERNAL
int init_thin_segtypes(struct cmd_context *cmd, struct segtype_library *seglib)
#else /* Shared */
int init_multiple_segtypes(struct cmd_context *cmd, struct segtype_library *seglib);
int init_multiple_segtypes(struct cmd_context *cmd, struct segtype_library *seglib)
#endif
{
static const struct {
struct segtype_handler *ops;
const char name[16];
uint32_t flags;
} reg_segtypes[] = {
{ &_thin_pool_ops, "thin_pool", SEG_THIN_POOL },
/* FIXME Maybe use SEG_THIN_VOLUME instead of SEG_VIRTUAL */
{ &_thin_ops, "thin", SEG_THIN_VOLUME | SEG_VIRTUAL }
};
struct segment_type *segtype;
unsigned i;
for (i = 0; i < sizeof(reg_segtypes)/sizeof(reg_segtypes[0]); ++i) {
segtype = dm_zalloc(sizeof(*segtype));
if (!segtype) {
log_error("Failed to allocate memory for %s segtype",
reg_segtypes[i].name);
return 0;
}
segtype->ops = reg_segtypes[i].ops;
segtype->name = reg_segtypes[i].name;
segtype->flags = reg_segtypes[i].flags;
#ifdef DEVMAPPER_SUPPORT
# ifdef DMEVENTD
// FIXME if (_get_thin_dso_path(cmd))
// FIXME segtype->flags |= SEG_MONITORED;
# endif /* DMEVENTD */
#endif
if (!lvm_register_segtype(seglib, segtype))
return_0;
log_very_verbose("Initialised segtype: %s", segtype->name);
}
return 1;
}