From 1ff7e214e0cf0e7ef0280b71ab128e029172a1d9 Mon Sep 17 00:00:00 2001 From: Jonathan Brassow Date: Mon, 27 Jan 2014 05:29:35 -0600 Subject: cache: New 'cache' segment type This patch adds the cache segment type - the second of two necessary to create cache logical volumes. This segment type references the cachepool (the small fast device) and the origin (the large slow device); linking them to create the cache device. The cache device is the hierarchical device-mapper device that the user ulitmately makes use of. The cache segment sources the information necessary to construct the device-mapper cache target from the origin and cachepool segments to which it links. --- libdm/libdevmapper.h | 22 ++++++++ libdm/libdm-deptree.c | 137 +++++++++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 153 insertions(+), 6 deletions(-) (limited to 'libdm') diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h index 307450085..ae9a91aa3 100644 --- a/libdm/libdevmapper.h +++ b/libdm/libdevmapper.h @@ -715,6 +715,28 @@ int dm_tree_node_add_raid_target_with_params(struct dm_tree_node *node, /* Cache feature_flags */ #define DM_CACHE_FEATURE_WRITEBACK 0x00000001 #define DM_CACHE_FEATURE_WRITETHROUGH 0x00000002 +struct dm_tree_node_cache_params { + uint32_t version; + + uint32_t chunk_size; + uint32_t feature_flags; /* DM_CACHE_FEATURE_* */ + + int core_argc; + char **core_argv; + + char *policy_name; + int policy_argc; + char **policy_argv; + + const char *data_uuid; + const char *metadata_uuid; + const char *origin_uuid; + /* 'version == 0' end */ +}; + +int dm_tree_node_add_cache_target(struct dm_tree_node *node, + uint64_t size, + struct dm_tree_node_cache_params *p); /* * Replicator operation mode diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c index 42bb9e792..d3f664085 100644 --- a/libdm/libdm-deptree.c +++ b/libdm/libdm-deptree.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2005-2013 Red Hat, Inc. All rights reserved. + * Copyright (C) 2005-2014 Red Hat, Inc. All rights reserved. * * This file is part of the device-mapper userspace tools. * @@ -27,6 +27,7 @@ /* Supported segment types */ enum { + SEG_CACHE, SEG_CRYPT, SEG_ERROR, SEG_LINEAR, @@ -59,6 +60,7 @@ struct { unsigned type; const char *target; } dm_segtypes[] = { + { SEG_CACHE, "cache" }, { SEG_CRYPT, "crypt" }, { SEG_ERROR, "error" }, { SEG_LINEAR, "linear" }, @@ -158,18 +160,24 @@ struct load_segment { uint32_t stripe_size; /* Striped + raid */ int persistent; /* Snapshot */ - uint32_t chunk_size; /* Snapshot */ + uint32_t chunk_size; /* Snapshot + cache */ struct dm_tree_node *cow; /* Snapshot */ - struct dm_tree_node *origin; /* Snapshot + Snapshot origin */ + struct dm_tree_node *origin; /* Snapshot + Snapshot origin + Cache */ struct dm_tree_node *merge; /* Snapshot */ struct dm_tree_node *log; /* Mirror + Replicator */ uint32_t region_size; /* Mirror + raid */ unsigned clustered; /* Mirror */ unsigned mirror_area_count; /* Mirror */ - uint32_t flags; /* Mirror log */ + uint32_t flags; /* Mirror + raid + Cache */ char *uuid; /* Clustered mirror log */ + int core_argc; /* Cache */ + char **core_argv; /* Cache */ + char *policy_name; /* Cache */ + int policy_argc; /* Cache */ + char **policy_argv; /* Cache */ + const char *cipher; /* Crypt */ const char *chainmode; /* Crypt */ const char *iv; /* Crypt */ @@ -189,7 +197,7 @@ struct load_segment { uint32_t max_recovery_rate; /* raid kB/sec/disk */ uint32_t min_recovery_rate; /* raid kB/sec/disk */ - struct dm_tree_node *metadata; /* Thin_pool */ + struct dm_tree_node *metadata; /* Thin_pool + Cache */ struct dm_tree_node *pool; /* Thin_pool, Thin */ struct dm_tree_node *external; /* Thin */ struct dm_list thin_messages; /* Thin_pool */ @@ -2262,6 +2270,70 @@ static int _raid_emit_segment_line(struct dm_task *dmt, uint32_t major, return 1; } +static int _cache_emit_segment_line(struct dm_task *dmt, + struct load_segment *seg, + char *params, size_t paramsize) +{ + int i, pos = 0; + unsigned feature_count; + struct seg_area *area; + char data[DM_FORMAT_DEV_BUFSIZE]; + char metadata[DM_FORMAT_DEV_BUFSIZE]; + char origin[DM_FORMAT_DEV_BUFSIZE]; + + /* Metadata Dev */ + if (!_build_dev_string(metadata, sizeof(metadata), seg->metadata)) + return_0; + EMIT_PARAMS(pos, " %s", metadata); + + /* Cache Dev */ + if (!_build_dev_string(data, sizeof(origin), seg->pool)) + return_0; + EMIT_PARAMS(pos, " %s", data); + + /* Origin Dev */ + dm_list_iterate_items(area, &seg->areas) + break; /* There is only ever 1 area */ + if (!_build_dev_string(origin, sizeof(data), area->dev_node)) + return_0; + EMIT_PARAMS(pos, " %s", origin); + + /* Chunk size */ + EMIT_PARAMS(pos, " %u", seg->chunk_size); + + /* Features */ + feature_count = hweight32(seg->flags); + EMIT_PARAMS(pos, " %d", feature_count); + if (seg->flags & DM_CACHE_FEATURE_WRITETHROUGH) + EMIT_PARAMS(pos, " writethrough"); + else if (seg->flags & DM_CACHE_FEATURE_WRITEBACK) + EMIT_PARAMS(pos, " writeback"); + + /* Core Arguments (like 'migration_threshold') */ + if (seg->core_argc) { + EMIT_PARAMS(pos, " %d", seg->core_argc); + for (i = 0; i < seg->core_argc; i++) + EMIT_PARAMS(pos, " %s", seg->core_argv[i]); + } + + /* Cache Policy */ + if (!seg->policy_name) + EMIT_PARAMS(pos, " default 0"); + else { + EMIT_PARAMS(pos, " %s %d", seg->policy_name, seg->policy_argc); + if (seg->policy_argc % 2) { + log_error(INTERNAL_ERROR + "Cache policy arguments must be in " + " pairs"); + return 0; + } + for (i = 0; i < seg->policy_argc; i++) + EMIT_PARAMS(pos, " %s", seg->policy_argv[i]); + } + + return 1; +} + static int _thin_pool_emit_segment_line(struct dm_task *dmt, struct load_segment *seg, char *params, size_t paramsize) @@ -2398,6 +2470,10 @@ static int _emit_segment_line(struct dm_task *dmt, uint32_t major, if (!_thin_emit_segment_line(dmt, seg, params, paramsize)) return_0; break; + case SEG_CACHE: + if (!_cache_emit_segment_line(dmt, seg, params, paramsize)) + return_0; + break; } switch(seg->type) { @@ -2409,6 +2485,7 @@ static int _emit_segment_line(struct dm_task *dmt, uint32_t major, case SEG_ZERO: case SEG_THIN_POOL: case SEG_THIN: + case SEG_CACHE: break; case SEG_CRYPT: case SEG_LINEAR: @@ -3045,7 +3122,6 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node, return dm_tree_node_add_raid_target_with_params(node, size, ¶ms); } - /* * Various RAID status versions include: * Versions < 1.5.0 (4 fields): @@ -3124,6 +3200,55 @@ bad: return 0; } +int dm_tree_node_add_cache_target(struct dm_tree_node *node, + uint64_t size, + struct dm_tree_node_cache_params *p) +{ + int i; + struct load_segment *seg = NULL; + + for (i = 0; dm_segtypes[i].target && !seg; i++) { + if (strcmp("cache", dm_segtypes[i].target)) + continue; + if (!(seg = _add_segment(node, dm_segtypes[i].type, size))) + return_0; + } + + if (!seg) + return_0; + + if (!(seg->pool = dm_tree_find_node_by_uuid(node->dtree, + p->data_uuid))) { + log_error("Missing cache's data uuid, %s", + p->data_uuid); + return 0; + } + if (!_link_tree_nodes(node, seg->pool)) + return_0; + + if (!(seg->metadata = dm_tree_find_node_by_uuid(node->dtree, + p->metadata_uuid))) { + log_error("Missing cache's metadata uuid, %s", + p->metadata_uuid); + return 0; + } + if (!_link_tree_nodes(node, seg->metadata)) + return_0; + + seg->chunk_size = p->chunk_size; + + seg->flags = p->feature_flags; + + seg->core_argc = p->core_argc; + seg->core_argv = p->core_argv; + + seg->policy_name = p->policy_name; + seg->policy_argc = p->policy_argc; + seg->policy_argv = p->policy_argv; + + return 1; +} + int dm_tree_node_add_replicator_target(struct dm_tree_node *node, uint64_t size, const char *rlog_uuid, -- cgit v1.2.1