From 97d7e5aedb58daf91302ce8688f3dc5368db5191 Mon Sep 17 00:00:00 2001 From: Zdenek Kabelac Date: Mon, 7 Nov 2011 11:03:47 +0000 Subject: [PATCH] Thin supports snapshots Full support for thin snapshots. Create and remove is supported. TODO: lvconvert support is not yes available. --- lib/metadata/lv_manip.c | 55 ++++++++++++++++++++++++++++++++------- lib/metadata/merge.c | 2 ++ lib/metadata/metadata.h | 3 ++- lib/metadata/thin_manip.c | 33 +++++++++++++++++++++-- lib/report/report.c | 3 +++ lib/thin/thin.c | 10 +++---- tools/lvcreate.c | 7 ----- 7 files changed, 89 insertions(+), 24 deletions(-) diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c index d4b349426..588118eeb 100644 --- a/lib/metadata/lv_manip.c +++ b/lib/metadata/lv_manip.c @@ -255,9 +255,16 @@ struct lv_segment *alloc_lv_segment(const struct segment_type *segtype, dm_list_init(&seg->thin_messages); if (thin_pool_lv) { - seg->transaction_id = first_seg(thin_pool_lv)->transaction_id; - if (!attach_pool_lv(seg, thin_pool_lv)) - return_NULL; + /* If this thin volume, thin snapshot is being created */ + if (lv_is_thin_volume(thin_pool_lv)) { + seg->transaction_id = first_seg(first_seg(thin_pool_lv)->pool_lv)->transaction_id; + if (!attach_pool_lv(seg, first_seg(thin_pool_lv)->pool_lv, thin_pool_lv)) + return_NULL; + } else { + seg->transaction_id = first_seg(thin_pool_lv)->transaction_id; + if (!attach_pool_lv(seg, thin_pool_lv, NULL)) + return_NULL; + } } if (log_lv && !attach_mirror_log(seg, log_lv)) @@ -4004,8 +4011,20 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l status |= lp->permission | VISIBLE_LV; - /* FIXME Thin snapshots are different */ - if (lp->snapshot) { + if (lp->snapshot && lp->thin) { + if (!(org = find_lv(vg, lp->origin))) { + log_error("Couldn't find origin volume '%s'.", + lp->origin); + return NULL; + } + + if (org->status & LOCKED) { + log_error("Snapshots of locked devices are not supported."); + return NULL; + } + + lp->voriginextents = org->le_count; + } else if (lp->snapshot) { if (!activation()) { log_error("Can't create snapshot without using " "device-mapper kernel driver"); @@ -4074,7 +4093,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l return NULL; } - if (lp->snapshot && (lp->extents * vg->extent_size < 2 * lp->chunk_size)) { + if (lp->snapshot && !lp->thin && (lp->extents * vg->extent_size < 2 * lp->chunk_size)) { log_error("Unable to create a snapshot smaller than 2 chunks."); return NULL; } @@ -4105,7 +4124,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l } /* The snapshot segment gets created later */ - if (lp->snapshot && + if (lp->snapshot && !lp->thin && !(lp->segtype = get_segtype_from_string(cmd, "striped"))) return_NULL; @@ -4173,7 +4192,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l lp->mirrors, seg_is_thin_pool(lp) ? lp->poolmetadataextents : lp->region_size, seg_is_thin_volume(lp) ? lp->voriginextents : lp->extents, - seg_is_thin_volume(lp) ? lp->pool : NULL, lp->pvh, lp->alloc)) + seg_is_thin_volume(lp) ? (org ? org->name : lp->pool) : NULL, lp->pvh, lp->alloc)) return_NULL; if (seg_is_thin_pool(lp)) { @@ -4221,6 +4240,24 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l init_dmeventd_monitor(lp->activation_monitoring); if (seg_is_thin(lp)) { + + /* For thin snapshot suspend active thin origin first */ + if (org && lv_is_active(org)) { + if (!suspend_lv(cmd, org)) { + log_error("Failed to suspend thin origin %s.", + org->name); + goto revert_new_lv; + } else if (!resume_lv(cmd, org)) { + log_error("Failed to resume thin origin %s.", + org->name); + goto revert_new_lv; + } + /* At this point snapshot is active in kernel thin mda */ + if (!update_pool_lv(first_seg(org)->pool_lv, 0)) { + stack; + goto deactivate_and_revert_new_lv; + } + } if (((lp->activate == CHANGE_AY) || (lp->activate == CHANGE_AE) || (lp->activate == CHANGE_ALY))) { @@ -4261,7 +4298,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg, struct l goto deactivate_and_revert_new_lv; } - if (lp->snapshot) { + if (lp->snapshot && !lp->thin) { /* Reset permission after zeroing */ if (!(lp->permission & LVM_WRITE)) lv->status &= ~LVM_WRITE; diff --git a/lib/metadata/merge.c b/lib/metadata/merge.c index fbfa579e8..e691176fc 100644 --- a/lib/metadata/merge.c +++ b/lib/metadata/merge.c @@ -373,6 +373,8 @@ int check_lv_segments(struct logical_volume *lv, int complete_vg) seg_found++; if (seg->pool_metadata_lv == lv || seg->pool_lv == lv) seg_found++; + if (seg_is_thin_volume(seg) && seg->origin == lv) + seg_found++; if (!seg_found) { log_error("LV %s is used by LV %s:%" PRIu32 "-%" PRIu32 ", but missing ptr from %s to %s", diff --git a/lib/metadata/metadata.h b/lib/metadata/metadata.h index 06e820ce3..a8d28e980 100644 --- a/lib/metadata/metadata.h +++ b/lib/metadata/metadata.h @@ -456,7 +456,8 @@ int attach_pool_metadata_lv(struct lv_segment *seg, struct logical_volume *pool_metadata_lv); int attach_pool_data_lv(struct lv_segment *seg, struct logical_volume *pool_data_lv); -int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv); +int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv, + struct logical_volume *origin_lv); int detach_pool_lv(struct lv_segment *seg); int attach_pool_message(struct lv_segment *seg, dm_thin_message_t type, struct logical_volume *lv, uint32_t delete_id, diff --git a/lib/metadata/thin_manip.c b/lib/metadata/thin_manip.c index c23ec52a5..ed50d8efa 100644 --- a/lib/metadata/thin_manip.c +++ b/lib/metadata/thin_manip.c @@ -39,10 +39,15 @@ int attach_pool_data_lv(struct lv_segment *seg, struct logical_volume *pool_data return 1; } -int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv) +int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv, + struct logical_volume *origin) { seg->pool_lv = pool_lv; seg->lv->status |= THIN_VOLUME; + seg->origin = origin; + + if (origin && !add_seg_to_segs_using_this_lv(origin, seg)) + return_0; return add_seg_to_segs_using_this_lv(pool_lv, seg); } @@ -50,6 +55,7 @@ int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv) int detach_pool_lv(struct lv_segment *seg) { struct lv_thin_message *tmsg, *tmp; + struct seg_list *sl, *tsl; if (!seg->pool_lv || !lv_is_thin_pool(seg->pool_lv)) { log_error(INTERNAL_ERROR "LV %s is not a thin volume", @@ -78,7 +84,30 @@ int detach_pool_lv(struct lv_segment *seg) NULL, seg->device_id, 0)) return_0; - return remove_seg_from_segs_using_this_lv(seg->pool_lv, seg); + if (!remove_seg_from_segs_using_this_lv(seg->pool_lv, seg)) + return_0; + + if (seg->origin && + !remove_seg_from_segs_using_this_lv(seg->origin, seg)) + return_0; + + /* If thin origin, remove it from related thin snapshots */ + /* + * TODO: map removal of origin as snapshot lvconvert --merge? + * i.e. rename thin snapshot to origin thin origin + */ + dm_list_iterate_items_safe(sl, tsl, &seg->lv->segs_using_this_lv) { + if (!seg_is_thin_volume(sl->seg) || + (seg->lv != sl->seg->origin)) + continue; + + if (!remove_seg_from_segs_using_this_lv(seg->lv, sl->seg)) + return_0; + /* Thin snapshot is now regular thin volume */ + sl->seg->origin = NULL; + } + + return 1; } int attach_pool_message(struct lv_segment *seg, dm_thin_message_t type, diff --git a/lib/report/report.c b/lib/report/report.c index 4781f3a87..8b493cc36 100644 --- a/lib/report/report.c +++ b/lib/report/report.c @@ -309,6 +309,9 @@ static int _origin_disp(struct dm_report *rh, struct dm_pool *mem, if (lv_is_cow(lv)) return _lvname_disp(rh, mem, field, origin_from_cow(lv), private); + if (lv_is_thin_volume(lv) && first_seg(lv)->origin) + return _lvname_disp(rh, mem, field, first_seg(lv)->origin, private); + dm_report_field_set_value(field, "", NULL); return 1; } diff --git a/lib/thin/thin.c b/lib/thin/thin.c index ead082c21..cbdd2f304 100644 --- a/lib/thin/thin.c +++ b/lib/thin/thin.c @@ -317,7 +317,7 @@ static int _thin_text_import(struct lv_segment *seg, struct dm_hash_table *pv_hash __attribute__((unused))) { const char *lv_name; - struct logical_volume *pool_lv; + struct logical_volume *pool_lv, *origin = NULL; if (!dm_config_get_str(sn, "thin_pool", &lv_name)) return SEG_LOG_ERROR("Thin pool must be a string in"); @@ -325,9 +325,6 @@ static int _thin_text_import(struct lv_segment *seg, 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_get_uint64(sn, "transaction_id", &seg->transaction_id)) return SEG_LOG_ERROR("Could not read transaction_id for"); @@ -335,7 +332,7 @@ static int _thin_text_import(struct lv_segment *seg, 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))) + if (!(origin = find_lv(seg->lv->vg, lv_name))) return SEG_LOG_ERROR("Unknown origin %s in", lv_name); } @@ -346,6 +343,9 @@ static int _thin_text_import(struct lv_segment *seg, return SEG_LOG_ERROR("Unsupported value %u for device_id", seg->device_id); + if (!attach_pool_lv(seg, pool_lv, origin)) + return_0; + return 1; } diff --git a/tools/lvcreate.c b/tools/lvcreate.c index e0cca2e4d..ec48ae6d6 100644 --- a/tools/lvcreate.c +++ b/tools/lvcreate.c @@ -1013,13 +1013,6 @@ int lvcreate(struct cmd_context *cmd, int argc, char **argv) lp.pool, lp.vg_name, lp.snapshot ? " as snapshot of " : "", lp.snapshot ? lp.origin : "", lp.segtype->name); - /* FIXME Remove when thin snapshots are supported. */ - if (lp.thin && lp.snapshot) { - log_error("Thin snapshots are not yet supported."); - r = ECMD_FAILED; - goto_out; - } - if (!lv_create_single(vg, &lp)) { stack; r = ECMD_FAILED; -- 2.43.5