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lvm2/lib/activate/dev_manager.c
Alasdair Kergon 9b6135dca4 round readahead to multiple of page size in tools
2007-12-05 19:24:32 +00:00

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28 KiB
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/*
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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 "str_list.h"
#include "dev_manager.h"
#include "lvm-string.h"
#include "fs.h"
#include "defaults.h"
#include "segtype.h"
#include "display.h"
#include "toolcontext.h"
#include "targets.h"
#include "config.h"
#include "filter.h"
#include "activate.h"
#include <limits.h>
#include <dirent.h>
#define MAX_TARGET_PARAMSIZE 50000
#define UUID_PREFIX "LVM-"
typedef enum {
PRELOAD,
ACTIVATE,
DEACTIVATE,
SUSPEND,
SUSPEND_WITH_LOCKFS,
CLEAN
} action_t;
struct dev_manager {
struct dm_pool *mem;
struct cmd_context *cmd;
const char *stripe_filler;
void *target_state;
uint32_t pvmove_mirror_count;
char *vg_name;
};
struct lv_layer {
struct logical_volume *lv;
const char *old_name;
};
static const char *stripe_filler = NULL;
static char *_build_dlid(struct dm_pool *mem, const char *lvid, const char *layer)
{
char *dlid;
size_t len;
if (!layer)
layer = "";
len = sizeof(UUID_PREFIX) + sizeof(union lvid) + strlen(layer);
if (!(dlid = dm_pool_alloc(mem, len))) {
log_error("_build_dlid: pool allocation failed for %" PRIsize_t
" %s %s.", len, lvid, layer);
return NULL;
}
sprintf(dlid, UUID_PREFIX "%s%s%s", lvid, (*layer) ? "-" : "", layer);
return dlid;
}
char *build_dlid(struct dev_manager *dm, const char *lvid, const char *layer)
{
return _build_dlid(dm->mem, lvid, layer);
}
static int _read_only_lv(struct logical_volume *lv)
{
return (!(lv->vg->status & LVM_WRITE) || !(lv->status & LVM_WRITE));
}
/*
* Low level device-layer operations.
*/
static struct dm_task *_setup_task(const char *name, const char *uuid,
uint32_t *event_nr, int task)
{
struct dm_task *dmt;
if (!(dmt = dm_task_create(task))) {
stack;
return NULL;
}
if (name)
dm_task_set_name(dmt, name);
if (uuid && *uuid)
dm_task_set_uuid(dmt, uuid);
if (event_nr)
dm_task_set_event_nr(dmt, *event_nr);
return dmt;
}
static int _info_run(const char *name, const char *dlid, struct dm_info *info,
uint32_t *read_ahead, int mknodes, int with_open_count,
int with_read_ahead)
{
int r = 0;
struct dm_task *dmt;
int dmtask;
dmtask = mknodes ? DM_DEVICE_MKNODES : DM_DEVICE_INFO;
if (!(dmt = _setup_task(name, dlid, 0, dmtask))) {
stack;
return 0;
}
if (!with_open_count)
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, info))
goto_out;
if (with_read_ahead) {
if (!dm_task_get_read_ahead(dmt, read_ahead))
goto_out;
} else if (read_ahead)
*read_ahead = DM_READ_AHEAD_NONE;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int device_is_usable(dev_t dev)
{
struct dm_task *dmt;
struct dm_info info;
const char *name;
uint64_t start, length;
char *target_type = NULL;
char *params;
void *next = NULL;
int r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_STATUS))) {
log_error("Failed to allocate dm_task struct to check dev status");
return 0;
}
if (!dm_task_set_major(dmt, MAJOR(dev)) || !dm_task_set_minor(dmt, MINOR(dev)))
goto_out;
if (!dm_task_run(dmt)) {
log_error("Failed to get state of mapped device");
goto out;
}
if (!dm_task_get_info(dmt, &info))
goto_out;
if (!info.exists || info.suspended)
goto out;
name = dm_task_get_name(dmt);
/* FIXME Also check for mirror block_on_error and mpath no paths */
/* For now, we exclude all mirrors */
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, &params);
/* Skip if target type doesn't match */
if (target_type && !strcmp(target_type, "mirror"))
goto out;
} while (next);
/* FIXME Also check dependencies? */
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _info(const char *name, const char *dlid, int mknodes,
int with_open_count, int with_read_ahead,
struct dm_info *info, uint32_t *read_ahead)
{
if (!mknodes && dlid && *dlid) {
if (_info_run(NULL, dlid, info, read_ahead, 0, with_open_count,
with_read_ahead) &&
info->exists)
return 1;
else if (_info_run(NULL, dlid + sizeof(UUID_PREFIX) - 1, info,
read_ahead, 0, with_open_count,
with_read_ahead) &&
info->exists)
return 1;
}
if (name)
return _info_run(name, NULL, info, read_ahead, mknodes,
with_open_count, with_read_ahead);
return 0;
}
int dev_manager_info(struct dm_pool *mem, const char *name,
const struct logical_volume *lv, int with_mknodes,
int with_open_count, int with_read_ahead,
struct dm_info *info, uint32_t *read_ahead)
{
const char *dlid;
if (!(dlid = _build_dlid(mem, lv->lvid.s, NULL))) {
log_error("dlid build failed for %s", lv->name);
return 0;
}
return _info(name, dlid, with_mknodes, with_open_count, with_read_ahead,
info, read_ahead);
}
/* FIXME Interface must cope with multiple targets */
static int _status_run(const char *name, const char *uuid,
unsigned long long *s, unsigned long long *l,
char **t, uint32_t t_size, char **p, uint32_t p_size)
{
int r = 0;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
if (!(dmt = _setup_task(name, uuid, 0, DM_DEVICE_STATUS))) {
stack;
return 0;
}
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
do {
next = dm_get_next_target(dmt, next, &start, &length,
&type, &params);
if (type) {
*s = start;
*l = length;
/* Make sure things are null terminated */
strncpy(*t, type, t_size);
(*t)[t_size - 1] = '\0';
strncpy(*p, params, p_size);
(*p)[p_size - 1] = '\0';
r = 1;
/* FIXME Cope with multiple targets! */
break;
}
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static int _status(const char *name, const char *uuid,
unsigned long long *start, unsigned long long *length,
char **type, uint32_t type_size, char **params,
uint32_t param_size) __attribute__ ((unused));
static int _status(const char *name, const char *uuid,
unsigned long long *start, unsigned long long *length,
char **type, uint32_t type_size, char **params,
uint32_t param_size)
{
if (uuid && *uuid) {
if (_status_run(NULL, uuid, start, length, type,
type_size, params, param_size) &&
*params)
return 1;
else if (_status_run(NULL, uuid + sizeof(UUID_PREFIX) - 1, start,
length, type, type_size, params,
param_size) &&
*params)
return 1;
}
if (name && _status_run(name, NULL, start, length, type, type_size,
params, param_size))
return 1;
return 0;
}
static int _percent_run(struct dev_manager *dm, const char *name,
const char *dlid,
const char *target_type, int wait,
struct logical_volume *lv, float *percent,
uint32_t *event_nr)
{
int r = 0;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
struct list *segh = &lv->segments;
struct lv_segment *seg = NULL;
struct segment_type *segtype;
uint64_t total_numerator = 0, total_denominator = 0;
*percent = -1;
if (!(dmt = _setup_task(name, dlid, event_nr,
wait ? DM_DEVICE_WAITEVENT : DM_DEVICE_STATUS))) {
stack;
return 0;
}
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
if (event_nr)
*event_nr = info.event_nr;
do {
next = dm_get_next_target(dmt, next, &start, &length, &type,
&params);
if (lv) {
if (!(segh = list_next(&lv->segments, segh))) {
log_error("Number of segments in active LV %s "
"does not match metadata", lv->name);
goto out;
}
seg = list_item(segh, struct lv_segment);
}
if (!type || !params || strcmp(type, target_type))
continue;
if (!(segtype = get_segtype_from_string(dm->cmd, type)))
continue;
if (segtype->ops->target_percent &&
!segtype->ops->target_percent(&dm->target_state, dm->mem,
dm->cmd, seg, params,
&total_numerator,
&total_denominator,
percent))
goto_out;
} while (next);
if (lv && (segh = list_next(&lv->segments, segh))) {
log_error("Number of segments in active LV %s does not "
"match metadata", lv->name);
goto out;
}
if (total_denominator)
*percent = (float) total_numerator *100 / total_denominator;
else if (*percent < 0)
*percent = 100;
log_debug("LV percent: %f", *percent);
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _percent(struct dev_manager *dm, const char *name, const char *dlid,
const char *target_type, int wait,
struct logical_volume *lv, float *percent,
uint32_t *event_nr)
{
if (dlid && *dlid) {
if (_percent_run(dm, NULL, dlid, target_type, wait, lv, percent,
event_nr))
return 1;
else if (_percent_run(dm, NULL, dlid + sizeof(UUID_PREFIX) - 1,
target_type, wait, lv, percent,
event_nr))
return 1;
}
if (name && _percent_run(dm, name, NULL, target_type, wait, lv, percent,
event_nr))
return 1;
return 0;
}
/*
* dev_manager implementation.
*/
struct dev_manager *dev_manager_create(struct cmd_context *cmd,
const char *vg_name)
{
struct dm_pool *mem;
struct dev_manager *dm;
if (!(mem = dm_pool_create("dev_manager", 16 * 1024))) {
stack;
return NULL;
}
if (!(dm = dm_pool_alloc(mem, sizeof(*dm))))
goto_bad;
dm->cmd = cmd;
dm->mem = mem;
if (!stripe_filler) {
stripe_filler = find_config_tree_str(cmd,
"activation/missing_stripe_filler",
DEFAULT_STRIPE_FILLER);
}
dm->stripe_filler = stripe_filler;
if (!(dm->vg_name = dm_pool_strdup(dm->mem, vg_name)))
goto_bad;
dm->target_state = NULL;
return dm;
bad:
dm_pool_destroy(mem);
return NULL;
}
void dev_manager_destroy(struct dev_manager *dm)
{
dm_pool_destroy(dm->mem);
}
void dev_manager_release(void)
{
dm_lib_release();
}
void dev_manager_exit(void)
{
dm_lib_exit();
}
int dev_manager_snapshot_percent(struct dev_manager *dm,
const struct logical_volume *lv,
float *percent)
{
char *name;
const char *dlid;
/*
* Build a name for the top layer.
*/
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, NULL)))
return_0;
if (!(dlid = build_dlid(dm, lv->lvid.s, NULL)))
return_0;
/*
* Try and get some info on this device.
*/
log_debug("Getting device status percentage for %s", name);
if (!(_percent(dm, name, dlid, "snapshot", 0, NULL, percent,
NULL))) {
stack;
return 0;
}
/* FIXME dm_pool_free ? */
/* If the snapshot isn't available, percent will be -1 */
return 1;
}
/* FIXME Merge with snapshot_percent, auto-detecting target type */
/* FIXME Cope with more than one target */
int dev_manager_mirror_percent(struct dev_manager *dm,
struct logical_volume *lv, int wait,
float *percent, uint32_t *event_nr)
{
char *name;
const char *dlid;
/*
* Build a name for the top layer.
*/
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, NULL)))
return_0;
/* FIXME dm_pool_free ? */
if (!(dlid = build_dlid(dm, lv->lvid.s, NULL))) {
log_error("dlid build failed for %s", lv->name);
return 0;
}
log_debug("Getting device mirror status percentage for %s", name);
if (!(_percent(dm, name, dlid, "mirror", wait, lv, percent,
event_nr))) {
stack;
return 0;
}
return 1;
}
#if 0
log_very_verbose("%s %s", sus ? "Suspending" : "Resuming", name);
log_verbose("Loading %s", dl->name);
log_very_verbose("Activating %s read-only", dl->name);
log_very_verbose("Activated %s %s %03u:%03u", dl->name,
dl->dlid, dl->info.major, dl->info.minor);
if (_get_flag(dl, VISIBLE))
log_verbose("Removing %s", dl->name);
else
log_very_verbose("Removing %s", dl->name);
log_debug("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
extent_size * seg->le, extent_size * seg->len, target, params);
log_debug("Adding target: 0 %" PRIu64 " snapshot-origin %s",
dl->lv->size, params);
log_debug("Adding target: 0 %" PRIu64 " snapshot %s", size, params);
log_debug("Getting device info for %s", dl->name);
/* Rename? */
if ((suffix = strrchr(dl->dlid + sizeof(UUID_PREFIX) - 1, '-')))
suffix++;
new_name = build_dm_name(dm->mem, dm->vg_name, dl->lv->name,
suffix);
static int _belong_to_vg(const char *vgname, const char *name)
{
const char *v = vgname, *n = name;
while (*v) {
if ((*v != *n) || (*v == '-' && *(++n) != '-'))
return 0;
v++, n++;
}
if (*n == '-' && *(n + 1) != '-')
return 1;
else
return 0;
}
if (!(snap_seg = find_cow(lv)))
return 1;
old_origin = snap_seg->origin;
/* Was this the last active snapshot with this origin? */
list_iterate_items(lvl, active_head) {
active = lvl->lv;
if ((snap_seg = find_cow(active)) &&
snap_seg->origin == old_origin) {
return 1;
}
}
#endif
/*************************/
/* NEW CODE STARTS HERE */
/*************************/
int dev_manager_lv_mknodes(const struct logical_volume *lv)
{
char *name;
if (!(name = build_dm_name(lv->vg->cmd->mem, lv->vg->name,
lv->name, NULL)))
return_0;
return fs_add_lv(lv, name);
}
int dev_manager_lv_rmnodes(const struct logical_volume *lv)
{
return fs_del_lv(lv);
}
static int _add_dev_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv, const char *layer)
{
char *dlid, *name;
struct dm_info info;
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dlid(dm, lv->lvid.s, layer)))
return_0;
log_debug("Getting device info for %s [%s]", name, dlid);
if (!_info(name, dlid, 0, 1, 0, &info, NULL)) {
log_error("Failed to get info for %s [%s].", name, dlid);
return 0;
}
if (info.exists && !dm_tree_add_dev(dtree, info.major, info.minor)) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree",
info.major, info.minor);
return 0;
}
return 1;
}
/*
* Add LV and any known dependencies
*/
static int _add_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree, struct logical_volume *lv)
{
if (!_add_dev_to_dtree(dm, dtree, lv, NULL))
return_0;
/* FIXME Can we avoid doing this every time? */
if (!_add_dev_to_dtree(dm, dtree, lv, "real"))
return_0;
if (!_add_dev_to_dtree(dm, dtree, lv, "cow"))
return_0;
if (!_add_dev_to_dtree(dm, dtree, lv, "_mlog"))
return_0;
return 1;
}
static struct dm_tree *_create_partial_dtree(struct dev_manager *dm, struct logical_volume *lv)
{
struct dm_tree *dtree;
struct list *snh, *snht;
struct lv_segment *seg;
uint32_t s;
if (!(dtree = dm_tree_create())) {
log_error("Partial dtree creation failed for %s.", lv->name);
return NULL;
}
if (!_add_lv_to_dtree(dm, dtree, lv)) {
stack;
goto fail;
}
/* Add any snapshots of this LV */
list_iterate_safe(snh, snht, &lv->snapshot_segs)
if (!_add_lv_to_dtree(dm, dtree, list_struct_base(snh, struct lv_segment, origin_list)->cow)) {
stack;
goto fail;
}
/* Add any LVs used by segments in this LV */
list_iterate_items(seg, &lv->segments)
for (s = 0; s < seg->area_count; s++)
if (seg_type(seg, s) == AREA_LV && seg_lv(seg, s)) {
if (!_add_lv_to_dtree(dm, dtree, seg_lv(seg, s))) {
stack;
goto fail;
}
}
return dtree;
fail:
dm_tree_free(dtree);
return NULL;
}
int add_areas_line(struct dev_manager *dm, struct lv_segment *seg,
struct dm_tree_node *node, uint32_t start_area,
uint32_t areas)
{
uint64_t extent_size = seg->lv->vg->extent_size;
uint32_t s;
char *dlid;
for (s = start_area; s < areas; s++) {
if ((seg_type(seg, s) == AREA_PV &&
(!seg_pvseg(seg, s) ||
!seg_pv(seg, s) ||
!seg_dev(seg, s))) ||
(seg_type(seg, s) == AREA_LV && !seg_lv(seg, s)))
dm_tree_node_add_target_area(node,
dm->stripe_filler,
NULL, UINT64_C(0));
else if (seg_type(seg, s) == AREA_PV)
dm_tree_node_add_target_area(node,
dev_name(seg_dev(seg, s)),
NULL,
(seg_pv(seg, s)->pe_start +
(extent_size * seg_pe(seg, s))));
else if (seg_type(seg, s) == AREA_LV) {
if (!(dlid = build_dlid(dm,
seg_lv(seg, s)->lvid.s,
NULL)))
return_0;
dm_tree_node_add_target_area(node, NULL, dlid,
extent_size * seg_le(seg, s));
} else {
log_error("Internal error: Unassigned area found in LV %s.",
seg->lv->name);
return 0;
}
}
return 1;
}
static int _add_origin_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct logical_volume *lv)
{
const char *real_dlid;
if (!(real_dlid = build_dlid(dm, lv->lvid.s, "real")))
return_0;
if (!dm_tree_node_add_snapshot_origin_target(dnode, lv->size, real_dlid))
return_0;
return 1;
}
static int _add_snapshot_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct logical_volume *lv)
{
const char *origin_dlid;
const char *cow_dlid;
struct lv_segment *snap_seg;
uint64_t size;
if (!(snap_seg = find_cow(lv))) {
log_error("Couldn't find snapshot for '%s'.", lv->name);
return 0;
}
if (!(origin_dlid = build_dlid(dm, snap_seg->origin->lvid.s, "real")))
return_0;
if (!(cow_dlid = build_dlid(dm, snap_seg->cow->lvid.s, "cow")))
return_0;
size = (uint64_t) snap_seg->len * snap_seg->origin->vg->extent_size;
if (!dm_tree_node_add_snapshot_target(dnode, size, origin_dlid, cow_dlid, 1, snap_seg->chunk_size))
return_0;
return 1;
}
static int _add_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct lv_segment *seg)
{
uint64_t extent_size = seg->lv->vg->extent_size;
if (!seg->segtype->ops->add_target_line) {
log_error("_emit_target: Internal error: Can't handle "
"segment type %s", seg->segtype->name);
return 0;
}
return seg->segtype->ops->add_target_line(dm, dm->mem, dm->cmd,
&dm->target_state, seg,
dnode,
extent_size * seg->len,
&dm-> pvmove_mirror_count);
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv, const char *layer);
static int _add_segment_to_dtree(struct dev_manager *dm,
struct dm_tree *dtree,
struct dm_tree_node *dnode,
struct lv_segment *seg,
const char *layer)
{
uint32_t s;
struct list *snh;
struct lv_segment *seg_present;
/* Ensure required device-mapper targets are loaded */
seg_present = find_cow(seg->lv) ? : seg;
log_debug("Checking kernel supports %s segment type for %s%s%s",
seg_present->segtype->name, seg->lv->name,
layer ? "-" : "", layer ? : "");
if (seg_present->segtype->ops->target_present &&
!seg_present->segtype->ops->target_present(seg_present)) {
log_error("Can't expand LV %s: %s target support missing "
"from kernel?", seg->lv->name, seg_present->segtype->name);
return 0;
}
/* Add mirror log */
if (seg->log_lv &&
!_add_new_lv_to_dtree(dm, dtree, seg->log_lv, NULL))
return_0;
/* If this is a snapshot origin, add real LV */
if (lv_is_origin(seg->lv) && !layer) {
if (seg->lv->vg->status & CLUSTERED) {
log_error("Clustered snapshots are not yet supported");
return 0;
}
if (!_add_new_lv_to_dtree(dm, dtree, seg->lv, "real"))
return_0;
} else if (lv_is_cow(seg->lv) && !layer) {
if (!_add_new_lv_to_dtree(dm, dtree, seg->lv, "cow"))
return_0;
} else {
/* Add any LVs used by this segment */
for (s = 0; s < seg->area_count; s++)
if ((seg_type(seg, s) == AREA_LV) &&
(!_add_new_lv_to_dtree(dm, dtree, seg_lv(seg, s), NULL)))
return_0;
}
/* Now we've added its dependencies, we can add the target itself */
if (lv_is_origin(seg->lv) && !layer) {
if (!_add_origin_target_to_dtree(dm, dnode, seg->lv))
return_0;
} else if (lv_is_cow(seg->lv) && !layer) {
if (!_add_snapshot_target_to_dtree(dm, dnode, seg->lv))
return_0;
} else if (!_add_target_to_dtree(dm, dnode, seg))
return_0;
if (lv_is_origin(seg->lv) && !layer)
/* Add any snapshots of this LV */
list_iterate(snh, &seg->lv->snapshot_segs)
if (!_add_new_lv_to_dtree(dm, dtree, list_struct_base(snh, struct lv_segment, origin_list)->cow, NULL))
return_0;
return 1;
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv, const char *layer)
{
struct lv_segment *seg;
struct lv_layer *lvlayer;
struct dm_tree_node *dnode;
char *name, *dlid;
uint32_t max_stripe_size = UINT32_C(0);
uint32_t read_ahead = lv->read_ahead;
uint32_t read_ahead_flags = UINT32_C(0);
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dlid(dm, lv->lvid.s, layer)))
return_0;
/* We've already processed this node if it already has a context ptr */
if ((dnode = dm_tree_find_node_by_uuid(dtree, dlid)) &&
dm_tree_node_get_context(dnode))
return 1;
if (!(lvlayer = dm_pool_alloc(dm->mem, sizeof(*lvlayer)))) {
log_error("_add_new_lv_to_dtree: pool alloc failed for %s %s.", lv->name, layer);
return 0;
}
lvlayer->lv = lv;
/*
* Add LV to dtree.
* If we're working with precommitted metadata, clear any
* existing inactive table left behind.
* Major/minor settings only apply to the visible layer.
*/
if (!(dnode = dm_tree_add_new_dev(dtree, name, dlid,
layer ? UINT32_C(0) : (uint32_t) lv->major,
layer ? UINT32_C(0) : (uint32_t) lv->minor,
_read_only_lv(lv),
(lv->vg->status & PRECOMMITTED) ? 1 : 0,
lvlayer)))
return_0;
/* Store existing name so we can do rename later */
lvlayer->old_name = dm_tree_node_get_name(dnode);
/* Create table */
dm->pvmove_mirror_count = 0u;
list_iterate_items(seg, &lv->segments) {
if (!_add_segment_to_dtree(dm, dtree, dnode, seg, layer))
return_0;
/* These aren't real segments in the LVM2 metadata */
if (lv_is_origin(lv) && !layer)
break;
if (lv_is_cow(lv) && !layer)
break;
if (max_stripe_size < seg->stripe_size)
max_stripe_size = seg->stripe_size;
}
if (read_ahead == DM_READ_AHEAD_AUTO) {
read_ahead = max_stripe_size;
read_ahead_flags = DM_READ_AHEAD_MINIMUM_FLAG;
}
dm_tree_node_set_read_ahead(dnode, read_ahead, read_ahead_flags);
return 1;
}
/* FIXME: symlinks should be created/destroyed at the same time
* as the kernel devices but we can't do that from within libdevmapper
* at present so we must walk the tree twice instead. */
/*
* Create LV symlinks for children of supplied root node.
*/
static int _create_lv_symlinks(struct dev_manager *dm, struct dm_tree_node *root)
{
void *handle = NULL;
struct dm_tree_node *child;
struct lv_layer *lvlayer;
char *vgname, *lvname, *layer;
const char *name;
int r = 1;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!(lvlayer = (struct lv_layer *) dm_tree_node_get_context(child)))
continue;
/* Detect rename */
name = dm_tree_node_get_name(child);
if (name && lvlayer->old_name && *lvlayer->old_name && strcmp(name, lvlayer->old_name)) {
if (!dm_split_lvm_name(dm->mem, lvlayer->old_name, &vgname, &lvname, &layer)) {
log_error("_create_lv_symlinks: Couldn't split up old device name %s", lvlayer->old_name);
return 0;
}
fs_rename_lv(lvlayer->lv, name, lvname);
} else if (!dev_manager_lv_mknodes(lvlayer->lv))
r = 0;
}
return r;
}
/*
* Remove LV symlinks for children of supplied root node.
*/
static int _remove_lv_symlinks(struct dev_manager *dm, struct dm_tree_node *root)
{
void *handle = NULL;
struct dm_tree_node *child;
char *vgname, *lvname, *layer;
int r = 1;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!dm_split_lvm_name(dm->mem, dm_tree_node_get_name(child), &vgname, &lvname, &layer)) {
r = 0;
continue;
}
/* only top level layer has symlinks */
if (*layer)
continue;
fs_del_lv_byname(dm->cmd->dev_dir, vgname, lvname);
}
return r;
}
static int _clean_tree(struct dev_manager *dm, struct dm_tree_node *root)
{
void *handle = NULL;
struct dm_tree_node *child;
char *vgname, *lvname, *layer;
const char *name, *uuid;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!(name = dm_tree_node_get_name(child)))
continue;
if (!(uuid = dm_tree_node_get_uuid(child)))
continue;
if (!dm_split_lvm_name(dm->mem, name, &vgname, &lvname, &layer)) {
log_error("_clean_tree: Couldn't split up device name %s.", name);
return 0;
}
/* Not meant to be top level? */
if (!*layer)
continue;
if (!dm_tree_deactivate_children(root, uuid, strlen(uuid)))
return_0;
}
return 1;
}
static int _tree_action(struct dev_manager *dm, struct logical_volume *lv, action_t action)
{
struct dm_tree *dtree;
struct dm_tree_node *root;
char *dlid;
int r = 0;
if (!(dtree = _create_partial_dtree(dm, lv)))
return_0;
if (!(root = dm_tree_find_node(dtree, 0, 0))) {
log_error("Lost dependency tree root node");
goto out;
}
if (!(dlid = build_dlid(dm, lv->lvid.s, NULL)))
goto_out;
/* Only process nodes with uuid of "LVM-" plus VG id. */
switch(action) {
case CLEAN:
/* Deactivate any unused non-toplevel nodes */
if (!_clean_tree(dm, root))
goto_out;
break;
case DEACTIVATE:
/* Deactivate LV and all devices it references that nothing else has open. */
if (!dm_tree_deactivate_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1))
goto_out;
if (!_remove_lv_symlinks(dm, root))
log_error("Failed to remove all device symlinks associated with %s.", lv->name);
break;
case SUSPEND:
dm_tree_skip_lockfs(root);
if ((lv->status & MIRRORED) && !(lv->status & PVMOVE))
dm_tree_use_no_flush_suspend(root);
case SUSPEND_WITH_LOCKFS:
if (!dm_tree_suspend_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1))
goto_out;
break;
case PRELOAD:
case ACTIVATE:
/* Add all required new devices to tree */
if (!_add_new_lv_to_dtree(dm, dtree, lv, NULL))
goto_out;
/* Preload any devices required before any suspensions */
if (!dm_tree_preload_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1))
goto_out;
if ((action == ACTIVATE) &&
!dm_tree_activate_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1))
goto_out;
if (!_create_lv_symlinks(dm, root)) {
log_error("Failed to create symlinks for %s.", lv->name);
goto out;
}
break;
default:
log_error("_tree_action: Action %u not supported.", action);
goto out;
}
r = 1;
out:
dm_tree_free(dtree);
return r;
}
int dev_manager_activate(struct dev_manager *dm, struct logical_volume *lv)
{
if (!_tree_action(dm, lv, ACTIVATE))
return_0;
return _tree_action(dm, lv, CLEAN);
}
int dev_manager_preload(struct dev_manager *dm, struct logical_volume *lv)
{
/* FIXME Update the pvmove implementation! */
if ((lv->status & PVMOVE) || (lv->status & LOCKED))
return 1;
return _tree_action(dm, lv, PRELOAD);
}
int dev_manager_deactivate(struct dev_manager *dm, struct logical_volume *lv)
{
int r;
r = _tree_action(dm, lv, DEACTIVATE);
fs_del_lv(lv);
return r;
}
int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv,
int lockfs)
{
return _tree_action(dm, lv, lockfs ? SUSPEND_WITH_LOCKFS : SUSPEND);
}
/*
* Does device use VG somewhere in its construction?
* Returns 1 if uncertain.
*/
int dev_manager_device_uses_vg(struct device *dev,
struct volume_group *vg)
{
struct dm_tree *dtree;
struct dm_tree_node *root;
char dlid[sizeof(UUID_PREFIX) + sizeof(struct id) - 1] __attribute((aligned(8)));
int r = 1;
if (!(dtree = dm_tree_create())) {
log_error("partial dtree creation failed");
return r;
}
if (!dm_tree_add_dev(dtree, (uint32_t) MAJOR(dev->dev), (uint32_t) MINOR(dev->dev))) {
log_error("Failed to add device %s (%" PRIu32 ":%" PRIu32") to dtree",
dev_name(dev), (uint32_t) MAJOR(dev->dev), (uint32_t) MINOR(dev->dev));
goto out;
}
memcpy(dlid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1);
memcpy(dlid + sizeof(UUID_PREFIX) - 1, &vg->id.uuid[0], sizeof(vg->id));
if (!(root = dm_tree_find_node(dtree, 0, 0))) {
log_error("Lost dependency tree root node");
goto out;
}
if (dm_tree_children_use_uuid(root, dlid, sizeof(UUID_PREFIX) + sizeof(vg->id) - 1))
goto_out;
r = 0;
out:
dm_tree_free(dtree);
return r;
}
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