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Code Releases Activity

snapshot: relocate common code validation for snapshot origin

Browse Source 
Since both lvcreate and lvconvert needs to check for same
type of allowed origin for snapshot - move the code into
a single function.

This way we also fix several inconsitencies where snapshot
has been allowed by mistake either through lvcreate or
lvconvert path.
This commit is contained in:
Zdenek Kabelac 2017-10-27 16:48:57 +02:00
parent 0c68c19c32
commit 63c50ced89
4 changed files with 60 additions and 71 deletions
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51
lib/metadata/lv_manip.c
View File

@ -7592,56 +7592,9 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
"Use --virtualsize.");
return NULL;
}
if (lv_is_cow(origin_lv)) {
log_error("Snapshots of snapshots are not supported.");
return NULL;
}
if (lv_is_locked(origin_lv)) {
log_error("Snapshots of locked devices are not supported.");
return NULL;
}
if (lv_is_merging_origin(origin_lv)) {
log_error("Snapshots of an origin that has a "
"merging snapshot is not supported");
return NULL;
}
if (lv_is_cache_type(origin_lv) && !lv_is_cache(origin_lv)) {
log_error("Snapshots of cache type volume %s "
"is not supported.", display_lvname(origin_lv));
return NULL;
}
if (lv_is_thin_type(origin_lv) && !lv_is_thin_volume(origin_lv)) {
log_error("Snapshots of thin pool %sdevices "
"are not supported.",
lv_is_thin_pool_data(origin_lv) ? "data " :
lv_is_thin_pool_metadata(origin_lv) ?
"metadata " : "");
return NULL;
}
if (lv_is_mirror_type(origin_lv)) {
if (!lv_is_mirror(origin_lv)) {
log_error("Snapshots of mirror subvolumes are not supported.");
return NULL;
}
log_warn("WARNING: Snapshots of mirrors can deadlock under rare device failures.");
log_warn("WARNING: Consider using the raid1 mirror type to avoid this.");
log_warn("WARNING: See global/mirror_segtype_default in lvm.conf.");
}
if (lv_is_raid_type(origin_lv) && !lv_is_raid(origin_lv)) {
log_error("Snapshots of raid subvolumes are not supported.");
return NULL;
}
if (vg_is_clustered(vg) && lv_is_active(origin_lv) &&
!lv_is_active_exclusive_locally(origin_lv)) {
log_error("%s must be active exclusively to"
" create snapshot", origin_lv->name);
return NULL;
}
if (!validate_snapshot_origin(origin_lv))
return_0;
}
if (!cow_has_min_chunks(vg, lp->extents, lp->chunk_size))

3
lib/metadata/metadata-exported.h
View File

@ -1074,6 +1074,9 @@ int vg_add_snapshot(struct logical_volume *origin, struct logical_volume *cow,
int vg_remove_snapshot(struct logical_volume *cow);
int validate_snapshot_origin(const struct logical_volume *origin_lv);
int vg_check_status(const struct volume_group *vg, uint64_t status);
int vg_check_pv_dev_block_sizes(const struct volume_group *vg);

44
lib/metadata/snapshot_manip.c
View File

@ -386,3 +386,47 @@ int vg_remove_snapshot(struct logical_volume *cow)
return 1;
}
/* Check if given LV is usable as snapshot origin LV */
int validate_snapshot_origin(const struct logical_volume *origin_lv)
{
const char *err = NULL; /* For error string */
if (lv_is_cow(origin_lv))
err = "snapshots";
else if (lv_is_locked(origin_lv))
err = "locked volumes";
else if (lv_is_pvmove(origin_lv))
err = "pvmoved volumes";
else if (!lv_is_visible(origin_lv))
err = "hidden volumes";
else if (lv_is_merging_origin(origin_lv))
err = "an origin that has a merging snapshot";
else if (lv_is_cache_type(origin_lv) && !lv_is_cache(origin_lv))
err = "cache type volumes";
else if (lv_is_thin_type(origin_lv) && !lv_is_thin_volume(origin_lv))
err = "thin pool type volumes";
else if (lv_is_mirror_type(origin_lv)) {
if (!lv_is_mirror(origin_lv))
err = "mirror subvolumes";
else {
log_warn("WARNING: Snapshots of mirrors can deadlock under rare device failures.");
log_warn("WARNING: Consider using the raid1 mirror type to avoid this.");
log_warn("WARNING: See global/mirror_segtype_default in lvm.conf.");
}
} else if (lv_is_raid_type(origin_lv) && !lv_is_raid(origin_lv))
err = "raid subvolumes";
if (err) {
log_error("Snapshots of %s are not supported.", err);
return 0;
}
if (vg_is_clustered(origin_lv->vg) && lv_is_active(origin_lv) &&
!lv_is_active_exclusive_locally(origin_lv)) {
log_error("Snapshot origin must be active exclusively.");
return 0;
}
return 1;
}

33
tools/lvconvert.c
View File

@ -1909,13 +1909,7 @@ static int _lvconvert_snapshot(struct cmd_context *cmd,
uint32_t chunk_size;
int zero;
if (!(org = find_lv(lv->vg, origin_name))) {
log_error("Couldn't find origin volume %s in Volume group %s.",
origin_name, lv->vg->name);
return 0;
}
if (org == lv) {
if (strcmp(lv->name, origin_name) == 0) {
log_error("Unable to use %s as both snapshot and origin.", snap_name);
return 0;
}
@ -1925,34 +1919,29 @@ static int _lvconvert_snapshot(struct cmd_context *cmd,
log_error("Chunk size must be a power of 2 in the range 4K to 512K.");
return 0;
}
log_verbose("Setting chunk size to %s.", display_size(cmd, chunk_size));
if (!cow_has_min_chunks(lv->vg, lv->le_count, chunk_size))
return_0;
log_verbose("Setting chunk size to %s.", display_size(cmd, chunk_size));
if (!(org = find_lv(lv->vg, origin_name))) {
log_error("Couldn't find origin volume %s in Volume group %s.",
origin_name, lv->vg->name);
return 0;
}
/*
* check_lv_rules() checks cannot be done via command definition
* rules because this LV is not processed by process_each_lv.
*/
if (lv_is_locked(org) || lv_is_pvmove(org)) {
log_error("Unable to use LV %s as snapshot origin: LV is %s.",
display_lvname(lv), lv_is_locked(org) ? "locked" : "pvmove");
return 0;
}
/*
* check_lv_types() checks cannot be done via command definition
* LV_foo specification because this LV is not processed by process_each_lv.
*/
if ((lv_is_cache_type(org) && !lv_is_cache(org)) ||
(lv_is_thin_type(org) && !lv_is_thin_volume(org)) ||
(lv_is_mirror_type(org) && !lv_is_mirror(org)) ||
(lv_is_raid_type(org) && !lv_is_raid(org)) ||
lv_is_cow(org)) {
log_error("Unable to use LV %s as snapshot origin: invalid LV type.",
display_lvname(lv));
return 0;
}
if (!validate_snapshot_origin(org))
return_0;
log_warn("WARNING: Converting logical volume %s to snapshot exception store.",
snap_name);