forked from vitalif/vitastor
Return version number from reads
parent
1100ad44bd
commit
b7ccd63104
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@ -40,7 +40,7 @@ void blockstore_t::enqueue_op_first(blockstore_op_t *op)
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impl->enqueue_op(op, true);
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}
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std::map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
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std::unordered_map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
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{
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return impl->unstable_writes;
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}
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13
blockstore.h
13
blockstore.h
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@ -55,8 +55,15 @@ struct blockstore_op_t
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std::function<void (blockstore_op_t*)> callback;
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// For reads, writes & deletes: oid is the requested object
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object_id oid;
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// For reads: version=0 -> last stable, version=UINT64_MAX -> last unstable, version=X -> specific version
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// For writes & deletes: a new version is assigned automatically
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// For reads:
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// version == 0 -> read the last stable version,
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// version == UINT64_MAX -> read the last version,
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// otherwise -> read the newest version that is <= the specified version
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// after execution, version is equal to the version that was read from the blockstore
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// For writes & deletes:
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// if version == 0, a new version is assigned automatically
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// if version != 0, it is assigned for the new write if possible, otherwise -EINVAL is returned
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// after execution, version is equal to the version that was written to the blockstore
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uint64_t version;
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// For reads & writes: offset & len are the requested part of the object, buf is the buffer
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uint32_t offset;
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@ -102,7 +109,7 @@ public:
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void enqueue_op_first(blockstore_op_t *op);
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// Unstable writes are added here (map of object_id -> version)
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std::map<object_id, uint64_t> & get_unstable_writes();
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std::unordered_map<object_id, uint64_t> & get_unstable_writes();
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// FIXME rename to object_size
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uint32_t get_block_size();
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@ -309,7 +309,7 @@ public:
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void enqueue_op(blockstore_op_t *op, bool first = false);
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// Unstable writes are added here (map of object_id -> version)
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std::map<object_id, uint64_t> unstable_writes;
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std::unordered_map<object_id, uint64_t> unstable_writes;
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inline uint32_t get_block_size() { return block_size; }
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inline uint64_t get_block_count() { return block_count; }
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@ -92,12 +92,14 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
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{
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// region is not allocated - return zeroes
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memset(read_op->buf, 0, read_op->len);
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read_op->version = 0;
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read_op->retval = read_op->len;
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read_op->callback(read_op);
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return 1;
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}
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uint64_t fulfilled = 0;
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PRIV(read_op)->pending_ops = 0;
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uint64_t result_version = 0;
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if (dirty_found)
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{
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while (dirty_it->first.oid == read_op->oid)
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@ -112,6 +114,10 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
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}
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if (version_ok)
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{
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if (!result_version)
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{
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result_version = dirty_it->first.version;
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}
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if (!fulfill_read(read_op, fulfilled, dirty.offset, dirty.offset + dirty.len,
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dirty.state, dirty_it->first.version, dirty.location + (IS_JOURNAL(dirty.state) ? 0 : dirty.offset)))
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{
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@ -129,6 +135,10 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
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}
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if (clean_it != clean_db.end() && fulfilled < read_op->len)
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{
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if (!result_version)
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{
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result_version = clean_it->second.version;
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}
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if (!clean_entry_bitmap_size)
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{
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if (!fulfill_read(read_op, fulfilled, 0, block_size, ST_CURRENT, 0, clean_it->second.location))
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@ -190,6 +200,7 @@ int blockstore_impl_t::dequeue_read(blockstore_op_t *read_op)
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fulfill_read(read_op, fulfilled, 0, block_size, ST_DEL_STABLE, 0, 0);
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}
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assert(fulfilled == read_op->len);
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read_op->version = result_version;
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if (!PRIV(read_op)->pending_ops)
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{
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// everything is fulfilled from memory
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@ -146,7 +146,8 @@ void osd_t::make_reply(osd_op_t *op)
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op->reply.hdr.retval = op->bs_op.retval;
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if (op->op.hdr.opcode == OSD_OP_SECONDARY_LIST)
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op->reply.sec_list.stable_count = op->bs_op.version;
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else if (op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE)
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else if (op->op.hdr.opcode == OSD_OP_SECONDARY_READ ||
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op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE)
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op->reply.sec_rw.version = op->bs_op.version;
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else if (op->op.hdr.opcode == OSD_OP_SECONDARY_DELETE)
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op->reply.sec_del.version = op->bs_op.version;
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@ -69,7 +69,7 @@ struct __attribute__((__packed__)) osd_op_secondary_rw_t
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struct __attribute__((__packed__)) osd_reply_secondary_rw_t
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{
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osd_reply_header_t header;
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// for writes: assigned version number
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// for reads and writes: assigned or read version number
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uint64_t version;
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};
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