////////////////////////////////////////////////////////////////////////////
////////////////////// COMMON METHODS ///////////////////////////////////
////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Attach new address space. Return 0 - successful; -1 - error
/// </summary>
/// <param name="_path"></param>
/// <param name="_cat_file"></param>
/// <param name="idx"></param>
/// <returns></returns>
internal string Attach(VSCatalogDescriptor desc, VSVirtualMemoryManager vmm, VSTransaction ta, bool imo)
{
DESCRIPTOR = desc;
vm = vmm;
vs_imo = imo;
// Check if restore is not completed
long l = vm.ReadLong(DEFS.SYSTEM_STATUS_ADDRESS);
if (l != 0)
{
return(VSException.GetMessage(DEFS.E0009_RESTORE_NOT_COMPLETED_CODE) + " Space: " + Name);
}
// Build index list
index_list = new List <VSIndex>();
index_list_full = new List <VSIndex>();
long addr = GetRootAddress(DEFS.POOL_INDEX); // Get 1st ADSC addredd
while (addr > 0)
{
VSIndex xd = new VSIndex(this, addr);
index_list_full.Add(xd);
if (xd.Name.IndexOf(DEFS.INDEX_CROSS_REFERENCES) < 0)
{
index_list.Add(xd);
}
addr = xd.NEXT;
}
// Set ref indexes
for (int i = 0; i < index_list.Count; i++)
{
set_ref_index(index_list[i]);
}
return("");
}
/// <summary>
/// Open new address space: _path - root folder path; _cat_file - catalog file name; idx - index in the catalog. Return: space id or -1(if error)
/// </summary>
/// <param name="_path"></param>
/// <param name="_cat_file"></param>
/// <param name="idx"></param>
/// <returns></returns>
public string Open(VSCatalogDescriptor desc, VSTransaction ta)
{
this.DESCRIPTOR = desc;
this.page_size = DESCRIPTOR.PageSize;
this.imo = DESCRIPTOR.IMO;
e_key = VSLib.ConvertStringToByte(DEFS.ENCRYPT_SPACE);
e_buf = new byte[page_size];
_ta = ta;
//////////////////////////////////////////////
///////////// Initiate partitions ////////////
//////////////////////////////////////////////
this.pd = new partition_descriptor[DESCRIPTOR.Partitions];
//Check if all partitions exists
if (imo)
{
pd[0].start_page = 0; //Start Page
pd[0].end_page = DESCRIPTOR.space_size_pg - 1; //End Page
}
else
{
for (int i = 0; i < DESCRIPTOR.Partitions; i++)
{
short j = (short)(i + 1);
pd[i].file_name = DESCRIPTOR.Path + "\\" + DEFS.SPACE_FILE_NAME(DESCRIPTOR.Name, i);
if (!System.IO.File.Exists(pd[i].file_name))
{
return("Error: space file is not found - " + pd[i].file_name);
}
//FileStream f = null;
//f = File.Open(pd[i].file_name, FileMode.Open, FileAccess.ReadWrite, FileShare.None);
pd[i].fs = new VSIO(pd[i].file_name, VSIO.FILE_MODE_OPEN, DEFS.ENCRYPT_SPACE);
pd[i].fs.SetEncryption(false);
pd[i].start_page = (i == 0) ? 0 : pd[i - 1].end_page + 1; //Start Page
pd[i].end_page = pd[i].start_page + ((pd[i].fs.GetLength()) / page_size) - 1; //End Page
}
}
//////////////////////////////////////////////
///////////// Initiate cache /////////////////
//////////////////////////////////////////////
// Create segment table
segment_table = new page_segment_descriptor[DEFS.PAGE_SEGMENTS_NUMBER];
// Create page table for 1st segment
segment_table[0] = new page_segment_descriptor();
segment_table[0].start_page = 0;
segment_table[0].end_page = DESCRIPTOR.space_size_pg - 1;
// Set initial number of segments used
segments_used = 1;
// Calculate cache size in pages
if (imo)
{
cache_size_pages = DESCRIPTOR.space_size_pg;
cache_size_bytes = DESCRIPTOR.SpaceSize;
}
else
{
string confs = VSLib.VSGetKey(DEFS.VM_CACHE_SIZE_KEY);
if (confs == "")
{
confs = DEFS.VM_CACHE_SIZE_DEFAULT;
VSLib.VSSetKey(DEFS.VM_CACHE_SIZE_KEY, confs);
}
int csize = VSLib.ConvertStringToInt(confs);
cache_size_bytes = ((csize < 2) ? 2 : csize) * 1048576;
if (cache_size_bytes < (page_size * 10))
{
cache_size_bytes = page_size * 10;
}
cache_size_pages = (cache_size_bytes / page_size) + 1;
}
// Initialize cache
segment_table[0].cache = new page_buffer[cache_size_pages];
for (int i = 0; i < cache_size_pages; i++)
{
segment_table[0].cache[i].buf = new byte[page_size];
segment_table[0].cache[i].tbuf = null;
segment_table[0].cache[i].last_access = 0;
segment_table[0].cache[i].access_count = 0;
if (imo)
{
segment_table[0].cache[i].page_no = i; // Page no = Buf no
segment_table[0].cache[i].prev = -1;
segment_table[0].cache[i].next = -1;
}
else
{
segment_table[0].cache[i].page_no = -1;
segment_table[0].cache[i].prev = i - 1;
segment_table[0].cache[i].next = ((i + 1) == cache_size_pages) ? -1 : i + 1;
}
}
// Initialize queues (not IMO)
if (!imo)
{
q_read = new int[3];
q_read[number] = 0;
q_read[first] = -1;
q_read[last] = -1;
q_write = new int[3];
q_write[number] = 0;
q_write[first] = -1;
q_write[last] = -1;
q_free = new int[3];
q_free[number] = (int)cache_size_pages;
q_free[first] = 0;
q_free[last] = (int)cache_size_pages - 1;
}
//////////////////////////////////////////////
///////////// Initiate page table ////////////
//////////////////////////////////////////////
segment_table[0].page_table = new page_descriptor[DESCRIPTOR.space_size_pg];
for (int i = 0; i < segment_table[0].page_table.Length; i++)
{
if (imo)
{
segment_table[0].page_table[i].page_state = DEFS.PAGE_READ;
segment_table[0].page_table[i].page_lock = DEFS.PAGE_LOCKED;
segment_table[0].page_table[i].bufno = i; // For IMO bufno = page table element
}
else
{
segment_table[0].page_table[i].page_state = DEFS.PAGE_FREE;
segment_table[0].page_table[i].page_lock = DEFS.PAGE_UNLOCKED;
segment_table[0].page_table[i].bufno = -1;
}
}
// Set state 'Opened'
this.state = DEFS.SPACE_OPENED;
// For IMO: write owner 'undefined'; otherwise: load and lock page 0.
if (imo)
{
this.Write(DEFS.SYSTEM_OWNER_ADDRESS, DEFS.SYSTEM_OWNER_UNDEFINED.PadRight((int)DEFS.SYSTEM_OWNER_LENGTH));
}
else
{
fetch(0, 0, 0, DEFS.PAGE_READ);
this.lock_page(0); // lock 1st page
}
return("");
}
/// <summary>
/// Open storage (all address spaces)
/// </summary>
/// <returns></returns>
public void Open(string path = "", string encrypt = "")
{
if (state == DEFS.STATE_OPENED)
{
return;
}
string p = (root_path == DEFS.PATH_UNDEFINED) ? path : root_path;
root_path = p.Trim();
this.Set(p);
// Space list
sl = new List <VSpace>();
// VMs list
vl = new List <VSVirtualMemoryManager>();
// Check if app directory exists. Create if missing
if (!Directory.Exists(DEFS.APP_ROOT_DATA))
{
Directory.CreateDirectory(DEFS.APP_ROOT_DATA);
}
// Check if keys directory exists. Create if missing
if (!Directory.Exists(DEFS.KEY_DIRECTORY))
{
Directory.CreateDirectory(DEFS.KEY_DIRECTORY);
}
///////////////////////////////////////////////////////
TA = new VSTransaction(TransactionFileName);
if (!this.Lock())
{
throw new VSException(DEFS.E0001_UNABLE_TO_LOCK_CODE);
}
// Attach spaces
for (int i = 0; i < CATALOG.Count; i++)
{
VSpace sp = new VSpace();
VSVirtualMemoryManager vm = new VSVirtualMemoryManager();
string err = vm.Open(CATALOG[i], TA);
if (err == "")
{
err = sp.Attach(CATALOG[i], vm, TA, IMO);
}
if (err != "")
{
this.Release();
throw new VSException(DEFS.E0017_ATTACH_SPACE_ERROR_CODE, "- " + err);
}
else
{
vl.Add(vm);
sl.Add(sp);
}
}
// Add index spaces references
for (int i = 0; i < sl.Count; i++)
{
if (CATALOG[i].IndexSpace != "")
{
for (int j = 0; j < sl.Count; j++)
{
if (sl[j].Name == CATALOG[i].IndexSpace)
{
sl[i].IndexSpace = sl[j];
break;
}
}
}
}
// Presistent only - check if rollback required
if (!IMO)
{
if (TA.Pending)
{
RollBackChanges();
}
}
//Process new FSAT creation and new allocation descriptors, Initialize KEyManager
for (int i = 0; i < sl.Count; i++)
{
sl[i].VerifySpaceChanges();
}
this.Commit();
state = DEFS.STATE_OPENED;
if (encrypt.Trim() != "")
{
this.encrypt = (encrypt.ToUpper().Substring(0, 1) == DEFS.CT_ENCRYPTED);
}
return;
}