/*
* Lock a list of LVs.
* On failure to lock any LV, calls vg_revert() if vg_to_revert is set and
* then unlocks any LVs on the list already successfully locked.
*/
int suspend_lvs(struct cmd_context *cmd, struct dm_list *lvs,
struct volume_group *vg_to_revert)
{
struct lv_list *lvl;
dm_list_iterate_items(lvl, lvs) {
if (!suspend_lv(cmd, lvl->lv)) {
log_error("Failed to suspend %s", lvl->lv->name);
if (vg_to_revert)
vg_revert(vg_to_revert);
/*
* FIXME Should be
* dm_list_uniterate(lvh, lvs, &lvl->list) {
* lvl = dm_list_item(lvh, struct lv_list);
* but revert would need fixing to use identical tree deps first.
*/
dm_list_iterate_items(lvl, lvs)
if (!revert_lv(cmd, lvl->lv))
stack;
return 0;
}
}
static int lvchange_readahead(struct cmd_context *cmd,
struct logical_volume *lv)
{
unsigned read_ahead = 0;
unsigned pagesize = (unsigned) lvm_getpagesize() >> SECTOR_SHIFT;
int r = 0;
read_ahead = arg_uint_value(cmd, readahead_ARG, 0);
if (read_ahead != DM_READ_AHEAD_AUTO &&
(lv->vg->fid->fmt->features & FMT_RESTRICTED_READAHEAD) &&
(read_ahead < 2 || read_ahead > 120)) {
log_error("Metadata only supports readahead values between 2 and 120.");
return 0;
}
if (read_ahead != DM_READ_AHEAD_AUTO &&
read_ahead != DM_READ_AHEAD_NONE && read_ahead % pagesize) {
if (read_ahead < pagesize)
read_ahead = pagesize;
else
read_ahead = (read_ahead / pagesize) * pagesize;
log_warn("WARNING: Overriding readahead to %u sectors, a multiple "
"of %uK page size.", read_ahead, pagesize >> 1);
}
if (lv->read_ahead == read_ahead) {
if (read_ahead == DM_READ_AHEAD_AUTO)
log_error("Read ahead is already auto for \"%s\"", lv->name);
else
log_error("Read ahead is already %u for \"%s\"",
read_ahead, lv->name);
return 0;
}
lv->read_ahead = read_ahead;
log_verbose("Setting read ahead to %u for \"%s\"", read_ahead,
lv->name);
log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
if (!vg_write(lv->vg))
return_0;
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg)) {
if (!resume_lv(cmd, lv))
stack;
goto_out;
}
log_very_verbose("Updating permissions for \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
goto out;
}
r = 1;
out:
backup(lv->vg);
return r;
}
static int lvchange_permission(struct cmd_context *cmd,
struct logical_volume *lv)
{
uint32_t lv_access;
struct lvinfo info;
int r = 0;
lv_access = arg_uint_value(cmd, permission_ARG, 0);
if ((lv_access & LVM_WRITE) && (lv->status & LVM_WRITE)) {
log_error("Logical volume \"%s\" is already writable",
lv->name);
return 0;
}
if (!(lv_access & LVM_WRITE) && !(lv->status & LVM_WRITE)) {
log_error("Logical volume \"%s\" is already read only",
lv->name);
return 0;
}
if ((lv->status & MIRRORED) && (vg_is_clustered(lv->vg)) &&
lv_info(cmd, lv, 0, &info, 0, 0) && info.exists) {
log_error("Cannot change permissions of mirror \"%s\" "
"while active.", lv->name);
return 0;
}
/* Not allowed to change permissions on RAID sub-LVs directly */
if ((lv->status & RAID_META) || (lv->status & RAID_IMAGE)) {
log_error("Cannot change permissions of RAID %s \"%s\"",
(lv->status & RAID_IMAGE) ? "image" :
"metadata area", lv->name);
return 0;
}
if (lv_access & LVM_WRITE) {
lv->status |= LVM_WRITE;
log_verbose("Setting logical volume \"%s\" read/write",
lv->name);
} else {
lv->status &= ~LVM_WRITE;
log_verbose("Setting logical volume \"%s\" read-only",
lv->name);
}
log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
if (!vg_write(lv->vg))
return_0;
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg)) {
if (!resume_lv(cmd, lv))
stack;
goto_out;
}
log_very_verbose("Updating permissions for \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
goto out;
}
r = 1;
out:
backup(lv->vg);
return r;
}
int vg_remove_snapshot(struct logical_volume *cow)
{
int merging_snapshot = 0;
struct logical_volume *origin = origin_from_cow(cow);
int is_origin_active = lv_is_active(origin);
if (is_origin_active &&
lv_is_virtual_origin(origin)) {
if (!deactivate_lv(origin->vg->cmd, origin)) {
log_error("Failed to deactivate logical volume \"%s\"",
origin->name);
return 0;
}
is_origin_active = 0;
}
dm_list_del(&cow->snapshot->origin_list);
origin->origin_count--;
if (lv_is_merging_origin(origin) &&
(find_snapshot(origin) == find_snapshot(cow))) {
clear_snapshot_merge(origin);
/*
* preload origin IFF "snapshot-merge" target is active
* - IMPORTANT: avoids preload if inactivate merge is pending
*/
if (lv_has_target_type(origin->vg->vgmem, origin, NULL,
TARGET_NAME_SNAPSHOT_MERGE)) {
/*
* preload origin to:
* - allow proper release of -cow
* - avoid allocations with other devices suspended
* when transitioning from "snapshot-merge" to
* "snapshot-origin after a merge completes.
*/
merging_snapshot = 1;
}
}
if (!lv_remove(cow->snapshot->lv)) {
log_error("Failed to remove internal snapshot LV %s",
cow->snapshot->lv->name);
return 0;
}
cow->snapshot = NULL;
lv_set_visible(cow);
/* format1 must do the change in one step, with the commit last. */
if (!(origin->vg->fid->fmt->features & FMT_MDAS)) {
/* Get the lock for COW volume */
if (is_origin_active && !activate_lv(cow->vg->cmd, cow)) {
log_error("Unable to activate logical volume \"%s\"",
cow->name);
return 0;
}
return 1;
}
if (!vg_write(origin->vg))
return_0;
/* Skip call suspend, if device is not active */
if (is_origin_active && !suspend_lv(origin->vg->cmd, origin)) {
log_error("Failed to refresh %s without snapshot.",
origin->name);
vg_revert(origin->vg);
return 0;
}
if (!vg_commit(origin->vg))
return_0;
if (is_origin_active) {
/*
* If the snapshot was active and the COW LV is taken away
* the LV lock on cluster has to be grabbed, so use
* activate_lv() which resumes suspend cow device.
*/
if (!merging_snapshot && !activate_lv(cow->vg->cmd, cow)) {
log_error("Failed to activate %s.", cow->name);
return 0;
}
if (!resume_lv(origin->vg->cmd, origin)) {
log_error("Failed to resume %s.", origin->name);
return 0;
}
/*
* For merged snapshot and clustered VG activate cow LV so
* the following call to deactivate_lv() can clean-up table
* entries. For this clustered lock need to be held.
*/
if (vg_is_clustered(cow->vg) &&
merging_snapshot && !activate_lv(cow->vg->cmd, cow)) {
log_error("Failed to activate %s.", cow->name);
return 0;
}
}
return 1;
}
static int lvchange_pool_update(struct cmd_context *cmd,
struct logical_volume *lv)
{
int r = 0;
int update = 0;
unsigned val;
thin_discards_t discards;
if (!lv_is_thin_pool(lv)) {
log_error("Logical volume \"%s\" is not a thin pool.", lv->name);
return 0;
}
if (arg_count(cmd, discards_ARG)) {
discards = (thin_discards_t) arg_uint_value(cmd, discards_ARG, THIN_DISCARDS_IGNORE);
if (discards != first_seg(lv)->discards) {
if ((discards != THIN_DISCARDS_IGNORE) &&
(first_seg(lv)->chunk_size &
(first_seg(lv)->chunk_size - 1)))
log_error("Cannot change discards state for "
"logical volume \"%s\" "
"with non power of 2 chunk size.", lv->name);
else if (((discards == THIN_DISCARDS_IGNORE) ||
(first_seg(lv)->discards == THIN_DISCARDS_IGNORE)) &&
lv_is_active(lv))
log_error("Cannot change discards state for active "
"logical volume \"%s\".", lv->name);
else {
first_seg(lv)->discards = discards;
update++;
}
} else
log_error("Logical volume \"%s\" already uses --discards %s.",
lv->name, get_pool_discards_name(discards));
}
if (arg_count(cmd, zero_ARG)) {
val = arg_uint_value(cmd, zero_ARG, 1);
if (val != first_seg(lv)->zero_new_blocks) {
first_seg(lv)->zero_new_blocks = val;
update++;
} else
log_error("Logical volume \"%s\" already %szero new blocks.",
lv->name, val ? "" : "does not ");
}
if (!update)
return 0;
log_very_verbose("Updating logical volume \"%s\" on disk(s).", lv->name);
if (!vg_write(lv->vg))
return_0;
if (!suspend_lv_origin(cmd, lv)) {
log_error("Failed to update active %s/%s (deactivation is needed).",
lv->vg->name, lv->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg)) {
if (!resume_lv_origin(cmd, lv))
stack;
goto_out;
}
if (!resume_lv_origin(cmd, lv)) {
log_error("Problem reactivating %s.", lv->name);
goto out;
}
r = 1;
out:
backup(lv->vg);
return r;
}
