[sheepdog] [PATCH 1/2] dog: implement vdi check for erasure coded vdi
Liu Yuan
namei.unix at gmail.com
Fri Oct 18 20:33:18 CEST 2013
On Sat, Oct 19, 2013 at 03:23:45AM +0900, MORITA Kazutaka wrote:
> At Sat, 19 Oct 2013 00:26:37 +0800,
> Liu Yuan wrote:
> >
> > When data copy is missing, this command will rebuild it.
> >
> > For the case that data get inconsistent but still accessable, we just print
> > inconsistent warning because it is kind of hard to handle it and leave it
> > as a future work
> >
> > Signed-off-by: Liu Yuan <namei.unix at gmail.com>
> > ---
> > dog/common.c | 9 +++
> > dog/dog.h | 1 +
> > dog/vdi.c | 148 ++++++++++++++++++++++++++++++++++++++--------
> > tests/functional/050 | 2 +-
> > tests/functional/052 | 22 +++----
> > tests/functional/052.out | 128 ++++++++++++++++++++++++++++-----------
> > tests/functional/055 | 8 +--
> > tests/functional/055.out | 12 ++--
> > tests/functional/056 | 12 ++--
> > tests/functional/056.out | 10 ++--
> > tests/functional/058 | 8 +--
> > tests/functional/058.out | 3 +
> > 12 files changed, 265 insertions(+), 98 deletions(-)
> >
> > diff --git a/dog/common.c b/dog/common.c
> > index 028d367..5e7ce2e 100644
> > --- a/dog/common.c
> > +++ b/dog/common.c
> > @@ -342,3 +342,12 @@ size_t get_store_objsize(uint8_t copy_policy, uint64_t oid)
> > }
> > return get_objsize(oid);
> > }
> > +
> > +bool is_erasure_oid(uint64_t oid, uint8_t policy)
> > +{
> > + if (is_vdi_obj(oid))
> > + return false;
> > + if (policy == 0)
> > + return false;
> > + return true;
> > +}
> > diff --git a/dog/dog.h b/dog/dog.h
> > index cfc9d54..769fc6c 100644
> > --- a/dog/dog.h
> > +++ b/dog/dog.h
> > @@ -83,6 +83,7 @@ int do_vdi_create(const char *vdiname, int64_t vdi_size,
> > int do_vdi_check(const struct sd_inode *inode);
> > void show_progress(uint64_t done, uint64_t total, bool raw);
> > size_t get_store_objsize(uint8_t copy_policy, uint64_t oid);
> > +bool is_erasure_oid(uint64_t oid, uint8_t policy);
> >
> > extern struct command vdi_command;
> > extern struct command node_command;
> > diff --git a/dog/vdi.c b/dog/vdi.c
> > index 2639007..4362f13 100644
> > --- a/dog/vdi.c
> > +++ b/dog/vdi.c
> > @@ -1397,7 +1397,7 @@ static void *read_object_from(const struct sd_vnode *vnode, uint64_t oid)
> > }
> >
> > static void write_object_to(const struct sd_vnode *vnode, uint64_t oid,
> > - void *buf, bool create)
> > + void *buf, bool create, uint8_t ec_index)
> > {
> > struct sd_req hdr;
> > struct sd_rsp *rsp = (struct sd_rsp *)&hdr;
> > @@ -1411,6 +1411,7 @@ static void write_object_to(const struct sd_vnode *vnode, uint64_t oid,
> > hdr.flags = SD_FLAG_CMD_WRITE;
> > hdr.data_length = get_objsize(oid);
> > hdr.obj.oid = oid;
> > + hdr.obj.ec_index = ec_index;
> >
> > ret = dog_exec_req(&vnode->node->nid, &hdr, buf);
> > if (ret < 0)
> > @@ -1427,13 +1428,16 @@ struct vdi_check_work {
> > struct vdi_check_info *info;
> > const struct sd_vnode *vnode;
> > uint8_t hash[SHA1_DIGEST_SIZE];
> > + uint8_t ec_index;
> > + uint8_t *buf;
> > bool object_found;
> > struct work work;
> > };
> >
> > struct vdi_check_info {
> > uint64_t oid;
> > - int nr_copies;
> > + uint8_t nr_copies;
> > + uint8_t copy_policy;
> > uint64_t total;
> > uint64_t *done;
> > int refcnt;
> > @@ -1459,7 +1463,7 @@ static void vdi_repair_work(struct work *work)
> > void *buf;
> >
> > buf = read_object_from(info->base->vnode, info->oid);
> > - write_object_to(vcw->vnode, info->oid, buf, !vcw->object_found);
> > + write_object_to(vcw->vnode, info->oid, buf, !vcw->object_found, 0);
> > free(buf);
> > }
> >
> > @@ -1479,7 +1483,7 @@ static void vdi_repair_main(struct work *work)
> > free_vdi_check_info(info);
> > }
> >
> > -static void vdi_hash_check_work(struct work *work)
> > +static void vdi_check_object_work(struct work *work)
> > {
> > struct vdi_check_work *vcw = container_of(work, struct vdi_check_work,
> > work);
> > @@ -1488,19 +1492,29 @@ static void vdi_hash_check_work(struct work *work)
> > struct sd_req hdr;
> > struct sd_rsp *rsp = (struct sd_rsp *)&hdr;
> >
> > - sd_init_req(&hdr, SD_OP_GET_HASH);
> > + if (is_erasure_oid(info->oid, info->copy_policy)) {
> > + sd_init_req(&hdr, SD_OP_READ_PEER);
> > + hdr.data_length = get_store_objsize(info->copy_policy,
> > + info->oid);
> > + hdr.obj.ec_index = vcw->ec_index;
> > + hdr.epoch = sd_epoch;
> > + vcw->buf = xmalloc(hdr.data_length);
> > + } else
> > + sd_init_req(&hdr, SD_OP_GET_HASH);
> > hdr.obj.oid = info->oid;
> > hdr.obj.tgt_epoch = sd_epoch;
> >
> > - ret = dog_exec_req(&vcw->vnode->node->nid, &hdr, NULL);
> > + ret = dog_exec_req(&vcw->vnode->node->nid, &hdr, vcw->buf);
> > if (ret < 0)
> > exit(EXIT_SYSFAIL);
> >
> > switch (rsp->result) {
> > case SD_RES_SUCCESS:
> > vcw->object_found = true;
> > - memcpy(vcw->hash, rsp->hash.digest, sizeof(vcw->hash));
> > - uatomic_set(&info->base, vcw);
> > + if (!is_erasure_oid(info->oid, info->copy_policy)) {
> > + memcpy(vcw->hash, rsp->hash.digest, sizeof(vcw->hash));
> > + uatomic_set(&info->base, vcw);
> > + }
> > break;
> > case SD_RES_NO_OBJ:
> > vcw->object_found = false;
> > @@ -1514,17 +1528,9 @@ static void vdi_hash_check_work(struct work *work)
> > }
> > }
> >
> > -static void vdi_hash_check_main(struct work *work)
> > +static void check_replicatoin_object(struct vdi_check_info *info)
> > {
> > - struct vdi_check_work *vcw = container_of(work, struct vdi_check_work,
> > - work);
> > - struct vdi_check_info *info = vcw->info;
> > -
> > - info->refcnt--;
> > - if (info->refcnt > 0)
> > - return;
> > -
> > - if (info->base == NULL) {
> > + if (info->base == NULL) {
> > sd_err("no node has %" PRIx64, info->oid);
> > exit(EXIT_FAILURE);
> > }
> > @@ -1542,6 +1548,99 @@ static void vdi_hash_check_main(struct work *work)
> > queue_work(info->wq, &info->vcw[i].work);
> > }
> > }
> > +}
> > +
> > +static void check_erasure_object(struct vdi_check_info *info)
> > +{
> > + int d = 0, p = 0, i, j, k;
> > + int dp = ec_policy_to_dp(info->copy_policy, &d, &p);
> > + struct fec *ctx = ec_init(d, dp);
> > + int miss_idx[dp], input_idx[dp];
> > + size_t strip_size = SD_EC_DATA_STRIPE_SIZE / d;
> > + uint64_t oid = info->oid;
> > + size_t len = get_store_objsize(info->copy_policy, oid);
> > + char *obj = xmalloc(len);
> > + uint8_t *input[dp];
> > +
> > + for (i = 0; i < dp; i++)
> > + miss_idx[i] = -1;
> > +
> > + for (i = 0, j = 0, k = 0; i < info->nr_copies; i++)
> > + if (!info->vcw[i].object_found) {
> > + miss_idx[j++] = i;
> > + } else {
> > + input_idx[k] = i;
> > + input[k] = info->vcw[i].buf;
> > + k++;
> > + }
> > +
> > + if (!j) { /* No object missing */
> > + int idx[d];
> > +
> > + for (i = 0; i < d; i++)
> > + idx[i] = i;
> > +
> > + for (k = 0; k < p; k++) {
> > + for (i = 0; i < SD_EC_NR_STRIPE_PER_OBJECT; i++) {
> > + const uint8_t *ds[d];
> > + uint8_t out[strip_size];
> > +
> > + for (j = 0; j < d; j++)
> > + ds[j] = info->vcw[j].buf + strip_size
> > + * i;
> > + ec_decode(ctx, ds, idx, out, d + k);
> > + memcpy(obj + strip_size * i, out, strip_size);
> > + }
> > + if (memcmp(obj, info->vcw[d + k].buf, len) != 0) {
> > + /* TODO repair the inconsistency */
> > + sd_err("object %"PRIx64" is inconsistent", oid);
> > + goto out;
> > + }
> > + }
> > + } else if (j > p) {
> > + sd_err("failed to rebuild object %"PRIx64". %d copies get "
> > + "lost, more than %d", oid, j, p);
> > + goto out;
> > + } else {
> > + for (k = 0; k < j; k++) {
> > + int m = miss_idx[k], n;
> > +
> > + for (i = 0; i < SD_EC_NR_STRIPE_PER_OBJECT; i++) {
> > + const uint8_t *ds[d];
> > + uint8_t out[strip_size];
> > +
> > + for (n = 0; n < d; n++)
> > + ds[n] = input[n] + strip_size * i;
> > + ec_decode(ctx, ds, input_idx, out, m);
> > + memcpy(obj + strip_size * i, out, strip_size);
> > + }
> > + write_object_to(info->vcw[m].vnode, oid, obj, true,
> > + info->vcw[m].ec_index);
> > + fprintf(stdout, "fixed missing %"PRIx64", "
> > + "copy index %d\n", info->oid, m);
> > + }
> > + }
> > +out:
> > + for (i = 0; i < dp; i++)
> > + free(info->vcw[i].buf);
> > + free(obj);
> > + ec_destroy(ctx);
> > +}
> > +
> > +static void vdi_check_object_main(struct work *work)
> > +{
> > + struct vdi_check_work *vcw = container_of(work, struct vdi_check_work,
> > + work);
> > + struct vdi_check_info *info = vcw->info;
> > +
> > + info->refcnt--;
> > + if (info->refcnt > 0)
> > + return;
> > +
> > + if (is_erasure_oid(info->oid, info->copy_policy))
> > + check_erasure_object(info);
> > + else
> > + check_replicatoin_object(info);
> >
> > if (info->refcnt == 0)
> > free_vdi_check_info(info);
> > @@ -1560,13 +1659,15 @@ static void queue_vdi_check_work(const struct sd_inode *inode, uint64_t oid,
> > info->total = inode->vdi_size;
> > info->done = done;
> > info->wq = wq;
> > + info->copy_policy = inode->copy_policy;
> >
> > oid_to_vnodes(oid, &sd_vroot, nr_copies, tgt_vnodes);
> > for (int i = 0; i < nr_copies; i++) {
> > info->vcw[i].info = info;
> > + info->vcw[i].ec_index = i;
> > info->vcw[i].vnode = tgt_vnodes[i];
> > - info->vcw[i].work.fn = vdi_hash_check_work;
> > - info->vcw[i].work.done = vdi_hash_check_main;
> > + info->vcw[i].work.fn = vdi_check_object_work;
> > + info->vcw[i].work.done = vdi_check_object_main;
> > info->refcnt++;
> > queue_work(info->wq, &info->vcw[i].work);
> > }
> > @@ -1586,6 +1687,8 @@ int do_vdi_check(const struct sd_inode *inode)
> >
> > wq = create_work_queue("vdi check", WQ_DYNAMIC);
> >
> > + init_fec();
> > +
> > queue_vdi_check_work(inode, vid_to_vdi_oid(inode->vdi_id), NULL, wq);
> >
> > max_idx = count_data_objs(inode);
> > @@ -1622,11 +1725,6 @@ static int vdi_check(int argc, char **argv)
> > return ret;
> > }
> >
> > - if (inode->copy_policy > 0) {
> > - sd_err("not implemented for erasure coded vdi");
> > - return EXIT_FAILURE;
> > - }
> > -
> > return do_vdi_check(inode);
> > }
> >
> > diff --git a/tests/functional/050 b/tests/functional/050
> > index ab28f1f..c7cfbab 100755
> > --- a/tests/functional/050
> > +++ b/tests/functional/050
> > @@ -22,7 +22,7 @@ _wait_for_sheep 6
> >
> > _cluster_format -c 6
> >
> > -$DOG vdi create test 100M
> > +_vdi_create test 100M
> > dd if=/dev/zero | $DOG vdi write test &
> >
> > # simulate IO NIC down of sheep 1
> > diff --git a/tests/functional/052 b/tests/functional/052
> > index bff9d52..2d556eb 100755
> > --- a/tests/functional/052
> > +++ b/tests/functional/052
> > @@ -4,22 +4,22 @@
> >
> > . ./common
> >
> > -for i in 0 1 2 3; do
> > +for i in `seq 0 5`; do
> > _start_sheep $i
> > done
> > -_wait_for_sheep 4
> > -_cluster_format
> > -$DOG vdi create test 20M -P
> > +_wait_for_sheep 6
> > +_cluster_format -c 6
> > +_vdi_create test 20M -P
>
> Rather than adding '-c 6' to _cluster_format, it looks cleaner to
> update _vdi_create() so that it creates 6 copies when -ec is not
> specified.
>
Hmm, this should be done inanother patch, since many other files need to be updated
too.
Thanks
Yuan
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