workbench/fs/fat/main.c

   1 /*
   2  * fat.handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007-2008 The AROS Development Team
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the same terms as AROS itself.
   9  *
  10  * $Id$
  11  */
  12
  13 #include <aros/asmcall.h>
  14 #include <aros/macros.h>
  15 #include <exec/types.h>
  16 #include <exec/execbase.h>
  17 #include <exec/memory.h>
  18 #include <dos/dos.h>
  19 #include <dos/dosextens.h>
  20 #include <dos/dostags.h>
  21 #include <dos/filehandler.h>
  22 #include <devices/trackdisk.h>
  23
  24 #include <proto/exec.h>
  25 #include <proto/dos.h>
  26
  27 #include <string.h>
  28
  29 #include "fat_fs.h"
  30 #include "fat_protos.h"
  31 #include "charset.h"
  32 #include "timer.h"
  33
  34 #define DEBUG DEBUG_MISC
  35 #include "debug.h"
  36
  37 struct DosLibrary *DOSBase;
  38 struct Library *UtilityBase;
  39 struct Library *IntuitionBase;
  40
  41 struct Globals global_data;
  42 struct Globals *glob = &global_data;
  43
  44 void handler(void) {
  45     struct Message *msg;
  46     struct DosPacket *startuppacket;
  47     struct DosList *dl;
  48     LONG error = ERROR_NO_FREE_STORE;
  49
  50     glob->ourtask = FindTask(NULL);
  51     glob->ourport = &((struct Process *)glob->ourtask)->pr_MsgPort;
  52     WaitPort(glob->ourport);
  53
  54     msg = GetMsg(glob->ourport);
  55     startuppacket = (struct DosPacket *) msg->mn_Node.ln_Name;
  56     glob->devnode = BADDR(startuppacket->dp_Arg3);
  57
  58     D(bug("\nFATFS: opening libraries.\n"));
  59     D(bug("\tFS task: %lx, port %lx\n"));
  60
  61     glob->notifyport = CreateMsgPort();
  62
  63     if ((DOSBase = (struct DosLibrary*)OpenLibrary("dos.library", 37))) {
  64         if ((IntuitionBase = OpenLibrary("intuition.library", 37))) {
  65             if ((UtilityBase = OpenLibrary("utility.library", 37))) {
  66                 glob->fssm = BADDR(startuppacket->dp_Arg2);
  67
  68                 if ((glob->mempool = CreatePool(MEMF_PUBLIC, DEF_POOL_SIZE, DEF_POOL_THRESHOLD))) {
  69
  70                     error = InitTimer();
  71                     if (!error) {
  72                         ULONG diskchgsig_bit;
  73
  74                         InitCharsetTables();
  75                         if ((error = InitDiskHandler(glob->fssm, &diskchgsig_bit)) == 0) {
  76                             ULONG pktsig = 1 << glob->ourport->mp_SigBit;
  77                             ULONG diskchgsig = 1 << diskchgsig_bit;
  78                             ULONG notifysig = 1 << glob->notifyport->mp_SigBit;
  79                             ULONG timersig = 1 << glob->timerport->mp_SigBit;
  80                             ULONG mask = pktsig | diskchgsig | notifysig | timersig;
  81                             ULONG sigs;
  82                             struct MsgPort *rp;
  83
  84                             D(bug("\tInitiated device: %s\n", AROS_BSTR_ADDR(glob->devnode->dol_Name)));
  85
  86                             glob->devnode->dol_Task = glob->ourport;
  87
  88                             D(bug("[fat] returning startup packet\n"));
  89
  90                             rp = startuppacket->dp_Port;
  91                             startuppacket->dp_Port = glob->ourport;
  92                             startuppacket->dp_Res1 = DOSTRUE;
  93                             startuppacket->dp_Res2 = 0;
  94                             PutMsg(rp, startuppacket->dp_Link);
  95
  96                             D(bug("Handler init finished.\n"));
  97
  98                             glob->sb = NULL;
  99                             glob->sblist = NULL;
 100                             glob->disk_inserted = FALSE;
 101                             glob->disk_inhibited = FALSE;
 102                             glob->quit = FALSE;
 103
 104                             ProcessDiskChange(); /* insert disk */
 105
 106                             while(!glob->quit) {
 107                                 sigs = Wait(mask);
 108                                 if (sigs & diskchgsig)
 109                                     ProcessDiskChange();
 110                                 if (sigs & pktsig)
 111                                     ProcessPackets();
 112                                 if (sigs & notifysig)
 113                                     ProcessNotify();
 114                                 if (sigs & timersig)
 115                                     HandleTimer();
 116                             }
 117
 118                             D(bug("\nHandler shutdown initiated\n"));
 119
 120                             error = 0;
 121                             startuppacket = NULL;
 122
 123                             dl = LockDosList(LDF_WRITE | LDF_DEVICES);
 124                             if (dl)
 125                             {
 126                                 RemDosEntry(glob->devnode);
 127                                 FreeDosEntry(glob->devnode);
 128                                 UnLockDosList(LDF_WRITE | LDF_DEVICES);
 129                             }
 130
 131                             CleanupDiskHandler(diskchgsig_bit);
 132                         }
 133                         CleanupTimer();
 134                     }
 135                     DeletePool(glob->mempool);
 136                 }
 137                 else
 138                     error = ERROR_NO_FREE_STORE;
 139
 140                 CloseLibrary(UtilityBase);
 141             }
 142             CloseLibrary(IntuitionBase);
 143         }
 144         CloseLibrary((struct Library*)DOSBase);
 145     }
 146
 147     DeleteMsgPort(glob->notifyport);
 148
 149     D(bug("The end.\n"));
 150
 151     if (startuppacket != NULL) {
 152         struct MsgPort *rp;
 153
 154         D(bug("[fat] returning startup packet\n"));
 155
 156         rp = startuppacket->dp_Port;
 157         startuppacket->dp_Port = glob->ourport;
 158         startuppacket->dp_Res1 = DOSTRUE;
 159         startuppacket->dp_Res2 = 0;
 160         PutMsg(rp, startuppacket->dp_Link);
 161     }
 162
 163     return;
 164 }
 165
 166 static struct IntData {
 167     struct Interrupt Interrupt;
 168     struct ExecBase *SysBase;
 169     struct Task *task;
 170     ULONG signal;
 171 } DiskChangeIntData;
 172
 173 AROS_UFH3(static BOOL, DiskChangeIntHandler,
 174     AROS_UFHA(struct IntData *,  MyIntData, A1),
 175     AROS_UFHA(APTR,              dummy, A5),
 176     AROS_UFHA(struct ExecBase *, SysBase, A6)) {
 177
 178     AROS_USERFUNC_INIT
 179
 180     struct ExecBase *SysBase = MyIntData->SysBase;
 181
 182     Signal(MyIntData->task, MyIntData->signal);
 183     return 0;
 184
 185     AROS_USERFUNC_EXIT
 186 }
 187
 188 LONG InitDiskHandler (struct FileSysStartupMsg *fssm, ULONG *diskchgsig_bit) {
 189     LONG err;
 190     ULONG diskchgintbit, flags, unit;
 191     UBYTE *device;
 192
 193     unit = fssm->fssm_Unit;
 194     flags = fssm->fssm_Flags;
 195
 196     device = AROS_BSTR_ADDR(fssm->fssm_Device);
 197
 198     if ((diskchgintbit = AllocSignal(-1)) >= 0) {
 199         *diskchgsig_bit = diskchgintbit;
 200
 201         if ((glob->diskport = CreateMsgPort())) {
 202
 203             if ((glob->diskioreq = CreateIORequest(glob->diskport, sizeof(struct IOExtTD)))) {
 204
 205                 if (OpenDevice(device, unit, (struct IORequest *)glob->diskioreq, flags) == 0) {
 206                     D(bug("\tDevice successfully opened\n"));
 207                     Probe_64bit_support();
 208
 209                     if ((glob->diskchgreq = AllocVec(sizeof(struct IOExtTD), MEMF_PUBLIC))) {
 210                         CopyMem(glob->diskioreq, glob->diskchgreq, sizeof(struct IOExtTD));
 211
 212                         /* fill interrupt data */
 213                         DiskChangeIntData.SysBase = SysBase;
 214                         DiskChangeIntData.task = glob->ourtask;
 215                         DiskChangeIntData.signal = 1 << diskchgintbit;
 216
 217                         DiskChangeIntData.Interrupt.is_Node.ln_Type = NT_INTERRUPT;
 218                         DiskChangeIntData.Interrupt.is_Node.ln_Pri = 0;
 219                         DiskChangeIntData.Interrupt.is_Node.ln_Name = "FATFS";
 220                         DiskChangeIntData.Interrupt.is_Data = &DiskChangeIntData;
 221                         DiskChangeIntData.Interrupt.is_Code = (void (*)(void))AROS_ASMSYMNAME(DiskChangeIntHandler);
 222
 223                         /* fill io request data */
 224                         glob->diskchgreq->iotd_Req.io_Command = TD_ADDCHANGEINT;
 225                         glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 226                         glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 227                         glob->diskchgreq->iotd_Req.io_Flags = 0;
 228
 229                         SendIO((struct IORequest*)glob->diskchgreq);
 230
 231                         D(bug("\tDisk change interrupt handler installed\n"));
 232
 233                         return 0;
 234                     }
 235                     else
 236                         err = ERROR_NO_FREE_STORE;
 237
 238                     CloseDevice((struct IORequest *)glob->diskioreq);
 239                 }
 240                 else
 241                     err = ERROR_DEVICE_NOT_MOUNTED;
 242
 243                 DeleteIORequest(glob->diskioreq);
 244                 glob->diskioreq = NULL;
 245             }
 246             else
 247                 err = ERROR_NO_FREE_STORE;
 248
 249             DeleteMsgPort(glob->diskport);
 250             glob->diskport = NULL;
 251         }
 252         else
 253             err = ERROR_NO_FREE_STORE;
 254
 255         FreeSignal(diskchgintbit);
 256
 257         *diskchgsig_bit = 0;
 258     }
 259     else
 260         err = ERROR_NO_FREE_STORE;
 261
 262     return err;
 263 }
 264
 265 void CleanupDiskHandler(ULONG diskchgsig_bit) {
 266     D(bug("\tFreeing handler resources:\n"));
 267
 268     /* remove disk change interrupt */
 269     glob->diskchgreq->iotd_Req.io_Command = TD_REMCHANGEINT;
 270     glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 271     glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 272     glob->diskchgreq->iotd_Req.io_Flags = 0;
 273
 274     DoIO((struct IORequest*)glob->diskchgreq);
 275     D(bug("\tDisk change interrupt handler removed\n"));
 276
 277     CloseDevice((struct IORequest *)glob->diskioreq);
 278     DeleteIORequest(glob->diskioreq);
 279     FreeVec(glob->diskchgreq);
 280     DeleteMsgPort(glob->diskport);
 281     D(bug("\tDevice closed\n"));
 282
 283     glob->diskioreq = NULL;
 284     glob->diskchgreq = NULL;
 285     glob->diskport = NULL;
 286
 287     FreeSignal(diskchgsig_bit);
 288
 289     D(bug("\tDone.\n"));
 290 }