/*
* submit a request to create a cache object for writing.
* The StoreEntry structure is sent as a hint to the filesystem
* to what will be stored in this object, to allow the filesystem
* to select different polices depending on object size or type.
*/
storeIOState *
storeCreate(StoreEntry * e, STIOCB * file_callback, STIOCB * close_callback, void *callback_data)
{
size_t objsize;
sdirno dirn;
SwapDir *SD;
storeIOState *sio;
store_io_stats.create.calls++;
/* This is just done for logging purposes */
objsize = objectLen(e);
if (objsize != -1)
objsize += e->mem_obj->swap_hdr_sz;
/*
* Pick the swapdir
* We assume that the header has been packed by now ..
*/
dirn = storeDirSelectSwapDir(e);
if (dirn == -1) {
debug(20, 2) ("storeCreate: no valid swapdirs for this object\n");
store_io_stats.create.select_fail++;
return NULL;
}
debug(20, 2) ("storeCreate: Selected dir '%d' for obj size '%ld'\n", dirn, (long int) objsize);
SD = &Config.cacheSwap.swapDirs[dirn];
/* Now that we have a fs to use, call its storeCreate function */
sio = SD->obj.create(SD, e, file_callback, close_callback, callback_data);
if (NULL == sio)
store_io_stats.create.create_fail++;
else
store_io_stats.create.success++;
return sio;
}
/*
* Build a TLV list for a StoreEntry
*/
tlv *
storeSwapMetaBuild(StoreEntry * e)
{
tlv *TLV = NULL; /* we'll return this */
tlv **T = &TLV;
const char *url;
const char *vary;
const squid_off_t objsize = objectLen(e);
assert(e->mem_obj != NULL);
assert(e->swap_status == SWAPOUT_WRITING);
url = storeUrl(e);
debug(20, 3) ("storeSwapMetaBuild: %s\n", url);
T = storeSwapTLVAdd(STORE_META_KEY, e->hash.key, SQUID_MD5_DIGEST_LENGTH, T);
#if SIZEOF_SQUID_FILE_SZ == SIZEOF_SIZE_T
T = storeSwapTLVAdd(STORE_META_STD, &e->timestamp, STORE_HDR_METASIZE, T);
#else
T = storeSwapTLVAdd(STORE_META_STD_LFS, &e->timestamp, STORE_HDR_METASIZE, T);
#endif
T = storeSwapTLVAdd(STORE_META_URL, url, strlen(url) + 1, T);
if (objsize > -1) {
T = storeSwapTLVAdd(STORE_META_OBJSIZE, &objsize, sizeof(objsize), T);
}
vary = e->mem_obj->vary_headers;
if (vary)
T = storeSwapTLVAdd(STORE_META_VARY_HEADERS, vary, strlen(vary) + 1, T);
if (e->mem_obj->store_url)
T = storeSwapTLVAdd(STORE_META_STOREURL, e->mem_obj->store_url, strlen(e->mem_obj->store_url) + 1, T);
if (e->dirkey)
T = storeSwapTLVAdd(STORE_META_KEY_URL, e->dirkey, SQUID_MD5_DIGEST_LENGTH, T);
return TLV;
}
/*
* This function is used below to decide if we have any more data to
* send to the client. If the store_status is STORE_PENDING, then we
* do have more data to send. If its STORE_OK, then
* we continue checking. If the object length is negative, then we
* don't know the real length and must open the swap file to find out.
* If the length is >= 0, then we compare it to the requested copy
* offset.
*/
static int
storeClientNoMoreToSend(StoreEntry * e, store_client * sc)
{
squid_off_t len;
if (e->store_status == STORE_PENDING)
return 0;
if ((len = objectLen(e)) < 0)
return 0;
if (sc->copy_offset < len)
return 0;
return 1;
}
static int
swdaeSwapDirRoundRobin(cache_select_t *cache, const StoreEntry * e)
{
static int dirn = 0;
int i;
int load;
SwapDir *sd;
squid_off_t objsize = objectLen(e);
for (i = 0; i < cache->dir.count; i++)
{
cache->dirn = cache->dirn % cache->dir.count;
dirn = (int)cache->dir.items[cache->dirn];
cache->dirn++;
if (0 > dirn || dirn >= Config.cacheSwap.n_configured)
continue;
sd = &Config.cacheSwap.swapDirs[dirn];
if (sd->flags.read_only)
{
debug(172, 5)("%s %s: %s read_only\n", PMOD_NAME, __func__, sd->path);
continue;
}
if (sd->cur_size > sd->max_size)
{
debug(172, 5)("%s %s: %scur_size > sd->max_size\n", PMOD_NAME, __func__, sd->path);
continue;
}
if (!swdaeSwapDirSwapDirSize(dirn, objsize))
{
debug(172,5)("%s %s objsize isn't Suitable %s %s\n",PMOD_NAME, __func__, sd->path, storeUrl(e));
continue;
}
if (sd->checkobj(sd, e) == 0)
{
debug(172,5)("%s %s checkobj(sd,e) == 0\n", PMOD_NAME, sd->path);
continue;
}
load = sd->checkload(sd, ST_OP_CREATE);
if (load < 0 || load > 2000)
{
debug(172, 5)("%s %s Load too high %s\n", PMOD_NAME, sd->path, storeUrl(e));
continue;
}
debug(172,3)("%s %s select [%s] store %s\n", PMOD_NAME, __func__, sd->path, storeUrl(e));
return dirn;
}
debug(172, 7)("%s %s nomatch %s\n", PMOD_NAME, __func__, storeUrl(e));
return -1;
}
static int
swdaeSwapDirLeastLoad(cache_select_t *cache, const StoreEntry *e)
{
squid_off_t objsize;
int most_free = 0, cur_free;
squid_off_t least_objsize = -1;
int least_load = INT_MAX;
int load;
int dirn = 0;
int dirn_no = -1;
int i;
SwapDir *sd;
/* Calculate the object size */
objsize = objectLen(e);
if (objsize != -1)
objsize += e->mem_obj->swap_hdr_sz;
for (i = 0; i < cache->dir.count; i++)
{
cache->dirn = cache->dirn % cache->dir.count;
dirn = (int)cache->dir.items[cache->dirn];
cache->dirn++;
if (0 > dirn || dirn >= Config.cacheSwap.n_configured)
continue;
sd = &Config.cacheSwap.swapDirs[dirn];
sd->flags.selected = 0;
if (sd->flags.read_only)
{
debug(172, 5)("%s %s %s read_only\n", PMOD_NAME, __func__,sd->path);
continue;
}
if (sd->cur_size > sd->max_size)
{
debug(172, 5)("%s %s %s cur_size > sd->max_size\n", PMOD_NAME, __func__, sd->path);
continue;
}
if (!swdaeSwapDirSwapDirSize(dirn, objsize))
{
debug(172,5)("%s %s objsize isn't Suitable %s %s\n", PMOD_NAME, __func__, sd->path, storeUrl(e));
continue;
}
if (sd->checkobj(sd, e) == 0)
{
debug(172,5)("%s %s %s checkobj(sd,e) == 0\n",PMOD_NAME, __func__, sd->path);
continue;
}
load = sd->checkload(sd, ST_OP_CREATE);
if (load < 0 || load > 2000)
{
debug(172, 5)("%s %s %s Load too high %s\n", PMOD_NAME, __func__, sd->path, storeUrl(e));
continue;
}
if (load > least_load)
continue;
cur_free = sd->max_size - sd->cur_size;
/* If the load is equal, then look in more details */
if (load == least_load)
{
/* closest max_objsize fit */
if (least_objsize != -1)
if (sd->max_objsize > least_objsize || sd->max_objsize == -1)
continue;
/* most free */
if (cur_free < most_free)
continue;
}
least_load = load;
least_objsize = sd->max_objsize;
most_free = cur_free;
dirn_no = dirn;
}
if (dirn_no >= 0)
{
sd = &Config.cacheSwap.swapDirs[dirn_no];
debug(172,5)("%s %s Select [%s] store %s\n", PMOD_NAME, __func__, sd->path, storeUrl(e));
Config.cacheSwap.swapDirs[dirn_no].flags.selected = 1;
}else
{
debug(172,5)("%s %s Select Null store %s\n",PMOD_NAME, __func__, storeUrl(e));
}
return dirn_no;
}
