cache/proto1/cache_op.c
author terom@cl-543.hel-01.fi.sixxs.net
Thu, 07 Aug 2008 20:28:06 +0300
changeset 30 33e464fd6773
permissions -rw-r--r--
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#include "cache.h"
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#include "common.h"
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struct cache_op {
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    u_int8_t key[CACHE_KEY];
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    struct cache_nest *nest;
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    u_int8_t obj_nest;
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    u_int32_t obj_offset;
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    u_int16_t obj_length:
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    void *mmap_addr;
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    // for linked lists
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    struct cache_op *next;
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};
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int _cache_op_get (struct cache_op **op_info, struct cache *cache_info, u_int8_t key[CACHE_KEY_SIZE]) {
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    struct cache_op *op;
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    // first, search the read queue
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    for (op = cache_info->rop_list; op; op = op->next) {
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        if (memcmp(op->key, key, CACHE_KEY_SIZE))
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            break;
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    }
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    if (!op) {
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        // look for in-progress write ops
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        for (int i = 0; i < CACHE_NEST_COUNT; i++) {
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            op = ctx->nests[i].op;
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            if (op && memcmp(op->key, key, CACHE_KEY_SIZE))
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                break;
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    }
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    if (!op) {
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        // look for queued write ops
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        for (op = cache_info->wop_list; op; op = op->next) {
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            if (memcmp(op->key, key, CACHE_KEY_SIZE))
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                break;
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        }
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    }
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    if (!op) {
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        // alloc a new op struct
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        op = calloc(1, sizeof(*op));
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        // look it up in the index
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        if (_cache_index_find(cache_info->index, key, &op->nest, &op->obj_offset, &op->obj_length) == 0) {
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            // found it in some nest
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            // XXX: enter read list and start read
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        } else {
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            // not in the cache, try and find an unused nest to write it
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            if (_cache_nest_assign_op(cache_info, op, &op->nest) == 0) {
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                // excellent, we can start writing directly
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                // XXX: start writing
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            } else {
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                // enter the wait queue...
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                // XXX: enter write queue
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            }
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        }
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    } else {
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        // XXX: start reading
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    }
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}
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