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mirror of git://sourceware.org/git/lvm2.git synced 2024-10-28 03:27:58 +03:00

Reduce the number of dm info calls.

This commit is contained in:
Alasdair Kergon 2002-03-14 21:17:30 +00:00
parent 4cc8088251
commit 14a9cda63b

View File

@ -67,8 +67,8 @@ struct dev_layer {
/*
* Setup the dm_task.
*/
int (*populate)(struct dev_manager *dm,
struct dm_task *dmt, struct dev_layer *dl);
int (*populate)(struct dev_manager * dm,
struct dm_task * dmt, struct dev_layer * dl);
struct dm_info info;
struct logical_volume *lv;
@ -76,13 +76,13 @@ struct dev_layer {
* Devices that must be created before this one can be
* created. Holds str_lists.
*/
struct list pre_create;
struct list pre_create;
/*
* Devices that must be created before this one can be
* unsuspended. Holds str_lists.
*/
struct list pre_active;
struct list pre_active;
};
struct dl_list {
@ -114,30 +114,31 @@ struct dev_manager {
struct hash_table *layers;
};
/*
* Functions to manage the flags.
*/
static inline int _get_flag(struct dev_layer *dl, int bit) {
static inline int _get_flag(struct dev_layer *dl, int bit)
{
return (dl->flags & (1 << bit)) ? 1 : 0;
}
static inline void _set_flag(struct dev_layer *dl, int bit) {
static inline void _set_flag(struct dev_layer *dl, int bit)
{
dl->flags |= (1 << bit);
}
static inline void _clear_flag(struct dev_layer *dl, int bit) {
static inline void _clear_flag(struct dev_layer *dl, int bit)
{
dl->flags &= ~(1 << bit);
}
/*
* Device layer names are all of the form <vg>-<lv>-<layer>, any
* other hyphens that appear in these names are quoted with yet
* another hyphen. The top layer of any device has no layer
* name. eg, vg0-lvol0.
*/
static void _count_hyphens(const char *str, size_t *len, int *hyphens)
static void _count_hyphens(const char *str, size_t * len, int *hyphens)
{
const char *ptr;
@ -196,7 +197,6 @@ static char *_build_name(struct pool *mem, const char *vg,
return r;
}
/*
* Low level device-layer operations.
*/
@ -213,6 +213,32 @@ static struct dm_task *_setup_task(const char *name, int task)
return dmt;
}
static int _info(const char *name, struct dm_info *info)
{
int r = 0;
struct dm_task *dmt;
log_debug("Getting device info for %s", name);
if (!(dmt = _setup_task(name, DM_DEVICE_INFO))) {
stack;
return 0;
}
if (!dm_task_run(dmt)) {
stack;
goto out;
}
if (!dm_task_get_info(dmt, info)) {
stack;
goto out;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _load(struct dev_manager *dm, struct dev_layer *dl, int task)
{
@ -229,7 +255,7 @@ static int _load(struct dev_manager *dm, struct dev_layer *dl, int task)
* Populate the table.
*/
if (!dl->populate(dm, dmt, dl)) {
log_err("Couldn't populate device '%s'.", dl->name);
log_error("Couldn't populate device '%s'.", dl->name);
return 0;
}
@ -238,13 +264,18 @@ static int _load(struct dev_manager *dm, struct dev_layer *dl, int task)
}
if (!(r = dm_task_run(dmt)))
log_err("Couldn't load device '%s'.", dl->name);
log_error("Couldn't load device '%s'.", dl->name);
if (!dm_task_get_info(dmt, &dl->info)) {
stack;
return 0;
}
dm_task_destroy(dmt);
if (_get_flag(dl, VISIBLE))
fs_add_lv(dl->lv, dl->name);
dl->info.exists = 1;
return r;
}
@ -260,7 +291,9 @@ static int _remove(struct dev_layer *dl)
}
if (!(r = dm_task_run(dmt)))
log_err("Couldn't remove device '%s'", dl->name);
log_error("Couldn't remove device '%s'", dl->name);
else
dl->info.exists = 0;
dm_task_destroy(dmt);
@ -283,8 +316,8 @@ static int _suspend_or_resume(const char *name, int sus)
}
if (!(r = dm_task_run(dmt)))
log_err("Couldn't %s device '%s'", sus ? "suspend" : "resume",
name);
log_error("Couldn't %s device '%s'", sus ? "suspend" : "resume",
name);
dm_task_destroy(dmt);
return r;
@ -318,40 +351,11 @@ static int _resume(struct dev_layer *dl)
return 1;
}
static int _info(const char *name, struct dm_info *info)
{
int r = 0;
struct dm_task *dmt;
log_very_verbose("Getting device info for %s", name);
if (!(dmt = _setup_task(name, DM_DEVICE_INFO))) {
stack;
return 0;
}
if (!dm_task_run(dmt)) {
stack;
goto out;
}
if (!dm_task_get_info(dmt, info)) {
stack;
goto out;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/*
* The functions that populate the table in a dm_task as part of
* a create/reload.
*/
/*
* Emit a target for a given segment.
* FIXME: tidy this function.
@ -362,8 +366,7 @@ static int _emit_target(struct dm_task *dmt, struct stripe_segment *seg)
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.";
const char *no_space = "Insufficient space to write target parameters.";
char *filler = "/dev/ioerror";
char *target;
@ -371,18 +374,17 @@ static int _emit_target(struct dm_task *dmt, struct stripe_segment *seg)
if (!seg->area[0].pv) {
target = "error";
error = 1;
}
else
} else
target = "linear";
}
if (stripes > 1) {
target = "striped";
tw = lvm_snprintf(params, sizeof(params), "%u %u ",
stripes, seg->stripe_size);
stripes, seg->stripe_size);
if (tw < 0) {
log_err(no_space);
log_error(no_space);
return 0;
}
@ -392,29 +394,29 @@ static int _emit_target(struct dm_task *dmt, struct stripe_segment *seg)
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) ? "" : " ");
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) ? "" : " ");
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);
log_error(no_space);
return 0;
}
}
}
log_very_verbose("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
esize * seg->le, esize * seg->len,
target, params);
log_debug("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)) {
@ -447,28 +449,26 @@ static int _populate_origin(struct dev_manager *dm,
struct dm_task *dmt, struct dev_layer *dl)
{
char *real;
char params[PATH_MAX + 32];
char params[PATH_MAX + 32];
if (!(real = _build_name(dm->mem, dm->vg_name,
dl->lv->name, "real"))) {
if (!(real = _build_name(dm->mem, dm->vg_name, dl->lv->name, "real"))) {
stack;
return 0;
}
if (lvm_snprintf(params, sizeof(params),
"%s/%s", dm_dir(), real) == -1) {
log_err("Couldn't create origin device parameters for '%s'.",
dl->name);
if (lvm_snprintf(params, sizeof(params), "%s/%s", dm_dir(), real) == -1) {
log_error("Couldn't create origin device parameters for '%s'.",
dl->name);
return 0;
}
log_very_verbose("Adding target: 0 %" PRIu64 " snapshot-origin %s",
dl->lv->size, params);
if (!dm_task_add_target(dmt, 0, dl->lv->size,
log_debug("Adding target: 0 %" PRIu64 " snapshot-origin %s",
dl->lv->size, params);
if (!dm_task_add_target(dmt, 0, dl->lv->size,
"snapshot-origin", params)) {
stack;
return 0;
}
stack;
return 0;
}
return 1;
}
@ -477,11 +477,11 @@ static int _populate_snapshot(struct dev_manager *dm,
struct dm_task *dmt, struct dev_layer *dl)
{
char *origin, *cow;
char params[PATH_MAX * 2 + 32];
char params[PATH_MAX * 2 + 32];
struct snapshot *s;
if (!(s = find_cow(dl->lv))) {
log_err("Couldn't find snapshot for '%s'.", dl->name);
log_error("Couldn't find snapshot for '%s'.", dl->name);
return 0;
}
@ -491,24 +491,23 @@ static int _populate_snapshot(struct dev_manager *dm,
return 0;
}
if (!(cow = _build_name(dm->mem, dm->vg_name,
s->cow->name, "cow"))) {
if (!(cow = _build_name(dm->mem, dm->vg_name, s->cow->name, "cow"))) {
stack;
return 0;
}
if (snprintf(params, sizeof(params), "%s/%s %s/%s P %d 128",
if (snprintf(params, sizeof(params), "%s/%s %s/%s P %d 128",
dm_dir(), origin, dm_dir(), cow, s->chunk_size) == -1) {
stack;
return 0;
}
stack;
return 0;
}
log_very_verbose("Adding target: 0 %" PRIu64 " snapshot %s",
s->origin->size, params);
if (!dm_task_add_target(dmt, 0, s->origin->size, "snapshot", params)) {
stack;
return 0;
}
log_debug("Adding target: 0 %" PRIu64 " snapshot %s",
s->origin->size, params);
if (!dm_task_add_target(dmt, 0, s->origin->size, "snapshot", params)) {
stack;
return 0;
}
return 1;
}
@ -549,7 +548,7 @@ struct dev_manager *dev_manager_create(const char *vg_name)
return dm;
bad:
bad:
pool_destroy(mem);
return NULL;
}
@ -604,13 +603,11 @@ int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv)
return 1;
}
static struct dev_layer *_create_dev(struct pool *mem,
char *name,
struct logical_volume *lv)
static struct dev_layer *_create_dev(struct dev_manager *dm, char *name)
{
struct dev_layer *dl;
if (!(dl = pool_zalloc(mem, sizeof(*dl)))) {
if (!(dl = pool_zalloc(dm->mem, sizeof(*dl)))) {
stack;
return NULL;
}
@ -622,25 +619,38 @@ static struct dev_layer *_create_dev(struct pool *mem,
return NULL;
}
dl->lv = lv;
list_init(&dl->pre_create);
list_init(&dl->pre_active);
return dl;
}
static struct dev_layer *_create_layer(struct pool *mem,
const char *layer,
struct logical_volume *lv)
{
char *name;
if (!(name = _build_name(mem, lv->vg->name, lv->name, layer))) {
if (!hash_insert(dm->layers, dl->name, dl)) {
stack;
return NULL;
}
return _create_dev(mem, name, lv);
return dl;
}
static struct dev_layer *_create_layer(struct dev_manager *dm,
const char *layer,
struct logical_volume *lv)
{
char *name;
struct dev_layer *dl;
if (!(name = _build_name(dm->mem, lv->vg->name, lv->name, layer))) {
stack;
return NULL;
}
if (!(dl = hash_lookup(dm->layers, name)) &&
!(dl = _create_dev(dm, name))) {
stack;
return NULL;
}
dl->lv = lv;
return dl;
}
/*
@ -662,25 +672,20 @@ static struct dev_layer *_lookup(struct dev_manager *dm,
return dl;
}
static int _expand_vanilla(struct dev_manager *dm, struct logical_volume *lv)
{
/*
* only one layer.
*/
struct dev_layer *dl;
if (!(dl = _create_layer(dm->mem, NULL, lv))) {
if (!(dl = _create_layer(dm, NULL, lv))) {
stack;
return 0;
}
dl->populate = _populate_vanilla;
_set_flag(dl, VISIBLE);
if (!hash_insert(dm->layers, dl->name, dl)) {
stack;
return 0;
}
return 1;
}
@ -691,20 +696,16 @@ static int _expand_origin_real(struct dev_manager *dm,
char *real_name;
struct str_list *sl;
if (!(dl = _create_layer(dm->mem, "real", lv))) {
if (!(dl = _create_layer(dm, "real", lv))) {
stack;
return 0;
}
dl->populate = _populate_vanilla;
_clear_flag(dl, VISIBLE);
if (!hash_insert(dm->layers, dl->name, dl)) {
stack;
return 0;
}
real_name = dl->name;
if (!(dl = _create_layer(dm->mem, NULL, lv))) {
if (!(dl = _create_layer(dm, NULL, lv))) {
stack;
return 0;
}
@ -724,15 +725,9 @@ static int _expand_origin_real(struct dev_manager *dm,
list_add(&dl->pre_create, &sl->list);
if (!hash_insert(dm->layers,dl->name, dl)) {
stack;
return 0;
}
return 1;
}
static int _expand_origin(struct dev_manager *dm, struct logical_volume *lv)
{
struct logical_volume *active;
@ -743,7 +738,7 @@ static int _expand_origin(struct dev_manager *dm, struct logical_volume *lv)
* We only need to create an origin layer if one of our
* snapshots is in the active list.
*/
list_iterate (sh, &dm->active_list) {
list_iterate(sh, &dm->active_list) {
active = list_item(sh, struct lv_list)->lv;
if ((s = find_cow(active)) && (s->origin == lv))
return _expand_origin_real(dm, lv);
@ -763,21 +758,16 @@ static int _expand_snapshot(struct dev_manager *dm, struct logical_volume *lv,
char *cow_name;
struct str_list *sl;
if (!(dl = _create_layer(dm->mem, "cow", lv))) {
if (!(dl = _create_layer(dm, "cow", lv))) {
stack;
return 0;
}
dl->populate = _populate_vanilla;
_clear_flag(dl, VISIBLE);
/* insert the cow layer */
if (!hash_insert(dm->layers, dl->name, dl)) {
stack;
return 0;
}
cow_name = dl->name;
if (!(dl = _create_layer(dm->mem, NULL, lv))) {
if (!(dl = _create_layer(dm, NULL, lv))) {
stack;
return 0;
}
@ -811,12 +801,6 @@ static int _expand_snapshot(struct dev_manager *dm, struct logical_volume *lv,
list_add(&dl->pre_create, &sl->list);
/* insert the snapshot layer */
if (!hash_insert(dm->layers,dl->name, dl)) {
stack;
return 0;
}
return 1;
}
@ -847,13 +831,12 @@ static void _clear_marks(struct dev_manager *dm, int flag)
struct hash_node *hn;
struct dev_layer *dl;
hash_iterate (hn, dm->layers) {
hash_iterate(hn, dm->layers) {
dl = hash_get_data(dm->layers, hn);
_clear_flag(dl, flag);
}
}
/*
* Propogates marks via the pre_create dependency list.
*/
@ -864,11 +847,11 @@ static int _trace_layer_marks(struct dev_manager *dm, struct dev_layer *dl,
char *name;
struct dev_layer *dep;
list_iterate (sh, &dl->pre_create) {
list_iterate(sh, &dl->pre_create) {
name = list_item(sh, struct str_list)->str;
if (!(dep = hash_lookup(dm->layers, name))) {
log_err("Couldn't find device layer '%s'.", name);
log_error("Couldn't find device layer '%s'.", name);
return 0;
}
@ -894,7 +877,7 @@ static int _trace_all_marks(struct dev_manager *dm, int flag)
struct hash_node *hn;
struct dev_layer *dl;
hash_iterate (hn, dm->layers) {
hash_iterate(hn, dm->layers) {
dl = hash_get_data(dm->layers, hn);
if (_get_flag(dl, flag) && !_trace_layer_marks(dm, dl, flag)) {
stack;
@ -915,7 +898,7 @@ static int _mark_lvs(struct dev_manager *dm, struct list *lvs, int flag)
struct logical_volume *lv;
struct dev_layer *dl;
list_iterate (lvh, lvs) {
list_iterate(lvh, lvs) {
lv = list_item(lvh, struct lv_list)->lv;
if (!(dl = _lookup(dm, lv->name, NULL))) {
@ -949,11 +932,11 @@ int _create_rec(struct dev_manager *dm, struct dev_layer *dl)
return 0;
}
list_iterate (sh, &dl->pre_create) {
list_iterate(sh, &dl->pre_create) {
name = list_item(sh, struct str_list)->str;
if (!(dep = hash_lookup(dm->layers, name))) {
log_err("Couldn't find device layer '%s'.", name);
log_error("Couldn't find device layer '%s'.", name);
return 0;
}
@ -994,7 +977,7 @@ static int _build_all_layers(struct dev_manager *dm, struct volume_group *vg)
/*
* Build layers for complete vg.
*/
list_iterate (lvh, &vg->lvs) {
list_iterate(lvh, &vg->lvs) {
lvt = list_item(lvh, struct lv_list)->lv;
if (!_expand_lv(dm, lvt)) {
stack;
@ -1011,7 +994,7 @@ static int _fill_in_remove_list(struct dev_manager *dm)
struct dev_layer *dl;
struct dl_list *dll;
hash_iterate (hn, dm->layers) {
hash_iterate(hn, dm->layers) {
dl = hash_get_data(dm->layers, hn);
if (!_get_flag(dl, ACTIVE)) {
@ -1029,7 +1012,6 @@ static int _fill_in_remove_list(struct dev_manager *dm)
return 1;
}
/*
* Layers are removed in a top-down manner.
*/
@ -1046,8 +1028,7 @@ int _remove_old_layers(struct dev_manager *dm)
struct dev_layer *dl;
change = 0;
for (rh = dm->remove_list.n; rh != &dm->remove_list; rh = n) {
n = rh->n;
list_iterate_safe(rh, n, &dm->remove_list) {
dl = list_item(rh, struct dl_list)->dl;
if (!_info(dl->name, &dl->info)) {
@ -1055,22 +1036,26 @@ int _remove_old_layers(struct dev_manager *dm)
return 0;
}
if (dl->info.exists && !dl->info.open_count) {
change = 1;
if (!dl->info.exists) {
list_del(rh);
continue;
}
if (!dl->info.open_count) {
if (!_remove(dl)) {
stack;
return 0;
continue;
}
change = 1;
list_del(rh);
}
}
} while(change);
} while (change);
if (!list_empty(&dm->remove_list)) {
log_err("Couldn't remove all redundant layers.");
log_error("Couldn't remove all redundant layers.");
return 0;
}
@ -1118,7 +1103,7 @@ static int _execute(struct dev_manager *dm, struct volume_group *vg)
/*
* Now only top level devices will be unmarked.
*/
hash_iterate (hn, dm->layers) {
hash_iterate(hn, dm->layers) {
dl = hash_get_data(dm->layers, hn);
if (_get_flag(dl, ACTIVE) && _get_flag(dl, VISIBLE))
@ -1133,8 +1118,6 @@ static int _execute(struct dev_manager *dm, struct volume_group *vg)
return 1;
}
/*
* ATM we decide which vg a layer belongs to by
* looking at the beginning of the device
@ -1150,27 +1133,17 @@ static int _belong_to_vg(const char *vg, const char *name)
static int _add_existing_layer(struct dev_manager *dm, const char *name)
{
struct dev_layer *new;
struct dev_layer *dl;
char *copy;
log_verbose("Found layer '%s'", name);
log_debug("Found existing layer '%s'", name);
if (!(copy = pool_strdup(dm->mem, name))) {
stack;
return 0;
}
if (!(new = _create_dev(dm->mem, copy, NULL))) {
stack;
return 0;
}
if (!_info(new->name, &new->info)) {
stack;
return 0;
}
if (!hash_insert(dm->layers, new->name, new)) {
if (!(dl = _create_dev(dm, copy))) {
stack;
return 0;
}
@ -1191,8 +1164,8 @@ static int _scan_existing_devices(struct dev_manager *dm)
return 1;
if (count < 0) {
log_err("Couldn't scan device-mapper directory '%s'.",
dev_dir);
log_error("Couldn't scan device-mapper directory '%s'.",
dev_dir);
return 0;
}
@ -1250,7 +1223,7 @@ static void _remove_lv(struct list *head, struct logical_volume *lv)
struct list *lvh;
struct lv_list *lvl;
list_iterate (lvh, head) {
list_iterate(lvh, head) {
lvl = list_item(lvh, struct lv_list);
if (lvl->lv == lv) {
list_del(lvh);
@ -1259,15 +1232,14 @@ static void _remove_lv(struct list *head, struct logical_volume *lv)
}
}
static int _fill_in_active_list(struct dev_manager *dm,
struct volume_group *vg)
static int _fill_in_active_list(struct dev_manager *dm, struct volume_group *vg)
{
int found;
char *name;
struct list *lvh;
struct logical_volume *lv;
list_iterate (lvh, &vg->lvs) {
list_iterate(lvh, &vg->lvs) {
lv = list_item(lvh, struct lv_list)->lv;
name = _build_name(dm->mem, dm->vg_name, lv->name, NULL);
@ -1280,7 +1252,7 @@ static int _fill_in_active_list(struct dev_manager *dm,
pool_free(dm->mem, name);
if (found) {
log_verbose("Active lv '%s' found.", lv->name);
log_debug("Active lv '%s' found.", lv->name);
if (!_add_lv(dm->mem, &dm->active_list, lv)) {
stack;