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-   -   Replicator: add libdm support (http://www.linux-archive.org/device-mapper-development/273372-replicator-add-libdm-support.html)

Zdenek Kabelac 11-02-2009 01:20 PM

Replicator: add libdm support
 
Introducing dm_tree_node_add_replicator_target() and
dm_tree_node_add_replicator_dev_target().

Signed-off-by: Zdenek Kabelac <zkabelac@redhat.com>
---
libdm/.exported_symbols | 2 +
libdm/libdevmapper.h | 27 +++++
libdm/libdm-deptree.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 300 insertions(+), 5 deletions(-)

diff --git a/libdm/.exported_symbols b/libdm/.exported_symbols
index 71f7b86..7b5e3f0 100644
--- a/libdm/.exported_symbols
+++ b/libdm/.exported_symbols
@@ -77,6 +77,8 @@ dm_tree_node_add_crypt_target
dm_tree_node_add_mirror_target
dm_tree_node_add_mirror_target_log
dm_tree_node_add_target_area
+dm_tree_node_add_replicator_target
+dm_tree_node_add_replicator_dev_target
dm_tree_node_set_read_ahead
dm_tree_skip_lockfs
dm_tree_use_no_flush_suspend
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 721e08a..f96aed3 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -430,6 +430,33 @@ int dm_tree_node_add_mirror_target_log(struct dm_tree_node *node,
const char *log_uuid,
unsigned area_count,
uint32_t flags);
+
+int dm_tree_node_add_replicator_target(struct dm_tree_node *node,
+ uint64_t size,
+ const char *rlog_uuid,
+ const char *rlog_type,
+ unsigned rsite_index,
+ int async_action,
+/* Replicator async action flags */
+#define DM_REPLICATOR_SYNC 0 /* use synchronous replication */
+#define DM_REPLICATOR_WARN 1 /* warn if replicator is slow */
+#define DM_REPLICATOR_STALL 2 /* stall replicator if not fast enough */
+#define DM_REPLICATOR_DROP 3 /* drop legs */
+#define DM_REPLICATOR_FAIL 4 /* fail replicator if slow */
+ uint32_t async_timeout,
+ uint64_t fall_behind_data,
+ uint32_t fall_behind_ios);
+
+int dm_tree_node_add_replicator_dev_target(struct dm_tree_node *node,
+ uint64_t size,
+ const char *replicator_uuid, /* replicator control device */
+ uint64_t rdevice_index,
+ const char *rdev_uuid, /* rimage device name/uuid */
+ unsigned rsite_index,
+ const char *slog_uuid,
+ uint32_t slog_flags, /* Mirror log flags */
+ uint32_t slog_size);
+
int dm_tree_node_add_target_area(struct dm_tree_node *node,
const char *dev_name,
const char *dlid,
diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index 5af24c3..0ba4e7e 100644
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -33,6 +33,8 @@ enum {
SEG_ERROR,
SEG_LINEAR,
SEG_MIRRORED,
+ SEG_REPLICATOR,
+ SEG_REPLICATOR_DEV,
SEG_SNAPSHOT,
SEG_SNAPSHOT_ORIGIN,
SEG_STRIPED,
@@ -49,6 +51,8 @@ struct {
{ SEG_ERROR, "error" },
{ SEG_LINEAR, "linear" },
{ SEG_MIRRORED, "mirror" },
+ { SEG_REPLICATOR, "replicator" },
+ { SEG_REPLICATOR_DEV, "replicator-dev" },
{ SEG_SNAPSHOT, "snapshot" },
{ SEG_SNAPSHOT_ORIGIN, "snapshot-origin" },
{ SEG_STRIPED, "striped" },
@@ -62,6 +66,23 @@ struct seg_area {
struct dm_tree_node *dev_node;

uint64_t offset;
+
+ unsigned rsite_index; /* Replicator site index */
+ struct dm_tree_node *slog; /* Replicator sync log node */
+ uint64_t region_size; /* Replicator sync log size */
+ uint32_t flags; /* Replicator sync log flags */
+};
+
+/* Replicator-log has a list of sites */
+/* CHECKME: maybe move to seg_area too ?? */
+struct replicator_site {
+ struct dm_list list;
+
+ unsigned rsite_index;
+ int async_action;
+ uint32_t async_timeout;
+ uint32_t fall_behind_ios;
+ uint64_t fall_behind_data;
};

/* Per-segment properties */
@@ -72,8 +93,8 @@ struct load_segment {

uint64_t size;

- unsigned area_count; /* Linear + Striped + Mirrored + Crypt */
- struct dm_list areas; /* Linear + Striped + Mirrored + Crypt */
+ unsigned area_count; /* Linear + Striped + Mirrored + Crypt + Replicator */
+ struct dm_list areas; /* Linear + Striped + Mirrored + Crypt + Replicator */

uint32_t stripe_size; /* Striped */

@@ -82,7 +103,7 @@ struct load_segment {
struct dm_tree_node *cow; /* Snapshot */
struct dm_tree_node *origin; /* Snapshot + Snapshot origin */

- struct dm_tree_node *log; /* Mirror */
+ struct dm_tree_node *log; /* Mirror + Replicator */
uint32_t region_size; /* Mirror */
unsigned clustered; /* Mirror */
unsigned mirror_area_count; /* Mirror */
@@ -94,6 +115,13 @@ struct load_segment {
const char *iv; /* Crypt */
uint64_t iv_offset; /* Crypt */
const char *key; /* Crypt */
+
+ const char *rlog_type; /* Replicator */
+ struct dm_list rsites; /* Replicator */
+ unsigned rsite_count; /* Replicator */
+ unsigned rdevice_count; /* Replicator */
+ struct dm_tree_node *replicator;/* Replicator-dev */
+ uint64_t rdevice_index; /* Replicator-dev */
};

/* Per-device properties */
@@ -1299,13 +1327,49 @@ static int _emit_areas_line(struct dm_task *dmt __attribute((unused)),
struct seg_area *area;
char devbuf[DM_FORMAT_DEV_BUFSIZE];
unsigned first_time = 1;
+ const char *logtype;
+ unsigned log_parm_count;

dm_list_iterate_items(area, &seg->areas) {
if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
return_0;

- EMIT_PARAMS(*pos, "%s%s %" PRIu64, first_time ? "" : " ",
- devbuf, area->offset);
+ switch (seg->type) {
+ case SEG_REPLICATOR_DEV:
+ EMIT_PARAMS(*pos, " %d 1 %s", area->rsite_index, devbuf);
+ if (!first_time) {
+ /* remote devices */
+ log_parm_count = (area->flags & (DM_NOSYNC | DM_FORCESYNC)) ? 2 : 1;
+
+ if (!area->slog) {
+ devbuf[0] = 0; /* only core log parameters */
+ logtype = "core";
+ } else {
+ devbuf[0] = ' '; /* extra space before device name */
+ if (!_build_dev_string(devbuf + 1, sizeof(devbuf) - 1,
+ area->slog))
+ return_0;
+ logtype = "disk";
+ log_parm_count++; /* extra sync log device name parameter */
+ }
+
+ EMIT_PARAMS(*pos, " %s %u%s %" PRIu64, logtype,
+ log_parm_count, devbuf, area->region_size);
+
+ logtype = (area->flags & DM_NOSYNC) ?
+ " nosync" : (area->flags & DM_FORCESYNC) ?
+ " sync" : NULL;
+
+ if (logtype)
+ EMIT_PARAMS(*pos, logtype);
+ } else
+ EMIT_PARAMS(*pos, " nolog 0");
+
+ break;
+ default:
+ EMIT_PARAMS(*pos, "%s%s %" PRIu64, first_time ? "" : " ",
+ devbuf, area->offset);
+ }

first_time = 0;
}
@@ -1313,6 +1377,42 @@ static int _emit_areas_line(struct dm_task *dmt __attribute((unused)),
return 1;
}

+static int _replicator_emit_segment_line(const struct load_segment *seg, char *params,
+ size_t paramsize, int *pos)
+{
+ const struct load_segment *rlog_seg;
+ const struct replicator_site *rsite;
+ char rlogbuf[DM_FORMAT_DEV_BUFSIZE];
+ unsigned parm_count;
+
+ if (!seg->log || !_build_dev_string(rlogbuf, sizeof(rlogbuf), seg->log))
+ return_0;
+
+ rlog_seg = dm_list_item(dm_list_last(&seg->log->props.segs),
+ struct load_segment);
+
+ EMIT_PARAMS(*pos, "%s 4 %s 0 auto %" PRIu64,
+ seg->rlog_type, rlogbuf, rlog_seg->size);
+
+ dm_list_iterate_items(rsite, &seg->rsites) {
+ parm_count = (rsite->fall_behind_data
+ || rsite->fall_behind_ios
+ || rsite->async_timeout) ? 4 : 2;
+
+ EMIT_PARAMS(*pos, " blockdev %u %u %s", parm_count, rsite->rsite_index,
+ (rsite->async_action == DM_REPLICATOR_SYNC) ? "sync" : "async");
+
+ if (rsite->fall_behind_data)
+ EMIT_PARAMS(*pos, " data %" PRIu64, rsite->fall_behind_data);
+ else if (rsite->fall_behind_ios)
+ EMIT_PARAMS(*pos, " ios %" PRIu32, rsite->fall_behind_ios);
+ else if (rsite->async_timeout)
+ EMIT_PARAMS(*pos, " timeout %" PRIu32, rsite->async_timeout);
+ }
+
+ return 1;
+}
+
/*
* Returns: 1 on success, 0 on failure
*/
@@ -1453,6 +1553,21 @@ static int _emit_segment_line(struct dm_task *dmt, uint32_t major,
if (!r)
return_0;
break;
+ case SEG_REPLICATOR:
+ if ((r = _replicator_emit_segment_line(seg, params, paramsize,
+ &pos)) <= 0) {
+ stack;
+ return r;
+ }
+ break;
+ case SEG_REPLICATOR_DEV:
+ if (!seg->replicator || !_build_dev_string(originbuf,
+ sizeof(originbuf),
+ seg->replicator))
+ return_0;
+
+ EMIT_PARAMS(pos, "%s %" PRIu64, originbuf, seg->rdevice_index);
+ break;
case SEG_SNAPSHOT:
if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
return_0;
@@ -1480,12 +1595,14 @@ static int _emit_segment_line(struct dm_task *dmt, uint32_t major,

switch(seg->type) {
case SEG_ERROR:
+ case SEG_REPLICATOR:
case SEG_SNAPSHOT:
case SEG_SNAPSHOT_ORIGIN:
case SEG_ZERO:
break;
case SEG_CRYPT:
case SEG_LINEAR:
+ case SEG_REPLICATOR_DEV:
case SEG_STRIPED:
if ((r = _emit_areas_line(dmt, seg, params, paramsize, &pos)) <= 0) {
stack;
@@ -1638,6 +1755,9 @@ int dm_tree_preload_children(struct dm_tree_node *dnode,
}
}

+ if (child->activation_priority != 0)
+ continue;
+
/* Propagate device size change change */
if (child->props.size_changed)
dnode->props.size_changed = 1;
@@ -1900,6 +2020,152 @@ int dm_tree_node_add_mirror_target(struct dm_tree_node *node,
return 1;
}

+int dm_tree_node_add_replicator_target(struct dm_tree_node *node,
+ uint64_t size,
+ const char *rlog_uuid,
+ const char *rlog_type,
+ unsigned rsite_index,
+ int async_action,
+ uint32_t async_timeout,
+ uint64_t fall_behind_data,
+ uint32_t fall_behind_ios)
+{
+ struct load_segment *rseg;
+ struct replicator_site *rsite;
+
+ if (rsite_index == 0) {
+ /* local site0 - add replog segment and set rlog device */
+ if (!(rseg = _add_segment(node, SEG_REPLICATOR, size)))
+ return_0;
+
+ if (!(rseg->log = dm_tree_find_node_by_uuid(node->dtree, rlog_uuid))) {
+ log_error("Missing replicator log uuid %s.", rlog_uuid);
+ return 0;
+ }
+
+ if (!_link_tree_nodes(node, rseg->log))
+ return_0;
+
+ if (strcmp(rlog_type, "ringbuffer") != 0) {
+ log_error("Unsupported rlog type %s.", rlog_type);
+ return 0;
+ }
+
+ if (!(rseg->rlog_type = dm_pool_strdup(node->dtree->mem, rlog_type)))
+ return_0;
+
+ dm_list_init(&rseg->rsites);
+ rseg->rdevice_count = 0;
+ node->activation_priority = 1;
+ }
+
+ if (!node->props.segment_count) {
+ log_error("Internal error: Attempt to add remote site area before replog.");
+ return 0;
+ }
+
+ /* new remote site */
+ if (async_action == DM_REPLICATOR_SYNC
+ && (async_timeout || fall_behind_ios || fall_behind_data)) {
+ log_error("Unsupported combination of sync options passed.");
+ return 0;
+ }
+
+ rseg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
+
+ if (!(rsite = dm_pool_zalloc(node->dtree->mem, sizeof (*rsite)))) {
+ log_error("Failed to allocate remote site segment.");
+ return 0;
+ }
+ dm_list_add(&rseg->rsites, &rsite->list);
+ rseg->rsite_count++;
+
+ rsite->async_action = async_action;
+ rsite->async_timeout = async_timeout;
+ rsite->fall_behind_data = fall_behind_data;
+ rsite->fall_behind_ios = fall_behind_ios;
+ rsite->rsite_index = rsite_index;
+
+ return 1;
+}
+
+/* Appends device node to Replicator */
+int dm_tree_node_add_replicator_dev_target(struct dm_tree_node *node,
+ uint64_t size,
+ const char *replicator_uuid,
+ uint64_t rdevice_index,
+ const char *rdev_uuid,
+ unsigned rsite_index,
+ const char *slog_uuid,
+ uint32_t slog_flags,
+ uint32_t slog_size)
+{
+ struct seg_area *area;
+ struct load_segment *rseg;
+ int is_uuid = (rdev_uuid) ? (strchr(rdev_uuid, '/') == NULL) : 0;
+
+ if (rsite_index == 0) {
+ /* site index for local target */
+ if (!(rseg = _add_segment(node, SEG_REPLICATOR_DEV, size)))
+ return_0;
+
+ if (!(rseg->replicator = dm_tree_find_node_by_uuid(node->dtree, replicator_uuid))) {
+ log_error("Missing replicator uuid %s.", replicator_uuid);
+ return 0;
+ }
+
+ if (!rseg->replicator->props.segment_count) {
+ /* local slink 0 for replicator must be always initialized first */
+ log_error("Internal error: Attempt to use empty replicator segment.");
+ return 0;
+ }
+
+
+ dm_list_item(dm_list_last(&rseg->replicator->props.segs),
+ struct load_segment)->rdevice_count++;
+
+ if (!_link_tree_nodes(node, rseg->replicator))
+ return_0;
+
+ rseg->rdevice_index = rdevice_index;
+ } else {
+ if (!node->props.segment_count) {
+ /* local slink 0 for replicator must be always initialized first */
+ log_error("Internal error: Attempt to add incorrrect remote target segment.");
+ return 0;
+ }
+
+ rseg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
+ }
+
+ if (!(slog_flags & DM_CORELOG) && !slog_uuid) {
+ log_error("Unspecified sync log uuid.");
+ return 0;
+ }
+
+ if (!dm_tree_node_add_target_area(node, (is_uuid) ? NULL : rdev_uuid,
+ (is_uuid) ? rdev_uuid : NULL, 0))
+ return 0;
+
+ area = dm_list_item(dm_list_last(&rseg->areas), struct seg_area);
+
+ if (!(slog_flags & DM_CORELOG)) {
+ if (!(area->slog = dm_tree_find_node_by_uuid(node->dtree, slog_uuid))) {
+ log_error("Couldn't find sync log uuid %s.", slog_uuid);
+ return 0;
+ }
+
+ if (!_link_tree_nodes(node, area->slog))
+ return_0;
+ }
+
+ area->flags = slog_flags;
+ area->region_size = slog_size;
+ area->rsite_index = rsite_index;
+
+ return 1;
+}
+
static int _add_area(struct dm_tree_node *node, struct load_segment *seg, struct dm_tree_node *dev_node, uint64_t offset)
{
struct seg_area *area;
--
1.6.5.1

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