workbench/fs/ntfs/lock.c

   1 /*
   2  * ntfs.handler - New Technology FileSystem handler
   3  *
   4  * Copyright © 2012 The AROS Development Team
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the same terms as AROS itself.
   8  *
   9  * $Id $
  10  */
  11
  12 #define AROS_ALMOST_COMPATIBLE
  13
  14 #include <aros/macros.h>
  15 #include <exec/types.h>
  16 #include <exec/execbase.h>
  17 #include <exec/memory.h>
  18 #include <dos/dosextens.h>
  19 #include <dos/filehandler.h>
  20
  21 #include <proto/exec.h>
  22 #include <proto/dos.h>
  23 #include <proto/utility.h>
  24
  25 #include <string.h>
  26
  27 #include "ntfs_fs.h"
  28 #include "ntfs_protos.h"
  29 #include "support.h"
  30
  31 #include "debug.h"
  32
  33 #if DEBUG == 0
  34 #define DumpLocks(fs_data)
  35 #else
  36 void DumpLocks(struct FSData *fs_data)
  37 {
  38     struct GlobalLock *gl;
  39     ULONG count;
  40
  41     bug("[NTFS] %s: global locks-:\n", __PRETTY_FUNCTION__);
  42
  43     ListLength(&fs_data->info->root_lock.locks, count);
  44     bug("[NTFS] %s:\troot: %ld references\n", __PRETTY_FUNCTION__, count);
  45
  46     ForeachNode(&fs_data->info->locks, gl) {
  47         ListLength(&gl->locks, count);
  48         bug("[NTFS] %s:\t    (%ld/%ld) ", __PRETTY_FUNCTION__, gl->dir_cluster / glob->data->mft_size, gl->dir_entry); RawPutChars(&(gl->name[1]), gl->name[0]);
  49         bug(": %ld references\n",  count);
  50     }
  51 }
  52 #endif
  53
  54 LONG TestLock(struct ExtFileLock *fl)
  55 {
  56     if (fl == 0 && glob->data == NULL) {
  57         if (glob->disk_inserted == FALSE)
  58             return ERROR_NO_DISK;
  59         else
  60             return ERROR_NOT_A_DOS_DISK;
  61     }
  62
  63     if (glob->data == NULL || glob->disk_inhibited || (fl && fl->fl_Volume != MKBADDR(glob->data->doslist)))
  64         return ERROR_DEVICE_NOT_MOUNTED;
  65
  66     if (fl && fl->magic != ID_NTFS_DISK)
  67         return ERROR_OBJECT_WRONG_TYPE;
  68
  69     return 0;
  70 }
  71
  72 LONG LockFileByName(struct ExtFileLock *fl, UBYTE *name, LONG namelen, LONG access, struct ExtFileLock **lock)
  73 {
  74     LONG err = ERROR_OBJECT_NOT_FOUND;
  75     struct DirHandle dirh;
  76     struct DirHandle *dh = &dirh;
  77     struct DirEntry de;
  78
  79     D(bug("[NTFS] %s('", __PRETTY_FUNCTION__); RawPutChars(name, namelen); bug("')\n"));
  80
  81     D(bug("[NTFS] %s: fs_data @ 0x%p\n", __PRETTY_FUNCTION__, glob->data));
  82
  83     /* if the name is empty, just duplicate the base lock */
  84     if (namelen == 0)
  85         return CopyLock(fl, lock);
  86
  87     /* if the base lock is a file, the name must either be empty (handled
  88      * above) or start with '/' (handled here) */
  89     if (fl != NULL && !(fl->gl->attr & ATTR_DIRECTORY)) {
  90         if (name[0] == '/') {
  91             if (namelen == 1)
  92                 return OpLockParent(fl, lock);
  93             else {
  94                 name++;
  95                 namelen--;
  96             }
  97         }
  98         else
  99             return ERROR_OBJECT_WRONG_TYPE;
 100     }
 101
 102     dh->ioh.mft.buf = NULL;
 103
 104     /* open the dir */
 105     if (fl == NULL)
 106     {
 107         dh->ioh.mft.mftrec_no = FILE_ROOT;
 108     }
 109     else
 110     {
 111         dh->ioh.mft.mftrec_no = fl->dir->ioh.mft.mftrec_no;
 112     }
 113     InitDirHandle(glob->data, dh, FALSE);
 114
 115     D(bug("[NTFS] %s: looking in directory MFT #%u\n", __PRETTY_FUNCTION__, (IPTR)dh->ioh.mft.mftrec_no));
 116
 117     memset(&de, 0, sizeof(struct DirEntry));
 118
 119     /* look for the entry */
 120     if ((err = GetDirEntryByPath(dh, name, namelen, &de)) != 0) {
 121         D(bug("[NTFS] %s: couldn't get lock\n", __PRETTY_FUNCTION__));
 122         return err;
 123     }
 124
 125     ReleaseDirHandle(dh);
 126
 127     /* found it, do the locking proper */
 128     if (de.entrytype & ATTR_DIRECTORY && !de.entry)
 129         err = LockRoot(access, lock);
 130     else
 131         err = LockFile(&de, access, lock);
 132
 133     return err;
 134 }
 135
 136 LONG LockFile(struct DirEntry *de, LONG access, struct ExtFileLock **lock)
 137 {
 138     struct GlobalLock *node, *gl;
 139     struct ExtFileLock *fl;
 140
 141     D(bug("[NTFS]: %s(entry @ 0x%p) (%s)\n", __PRETTY_FUNCTION__, de, access == SHARED_LOCK ? "shared" : "exclusive"));
 142
 143     /* first see if we already have a global lock for this file */
 144     gl = NULL;
 145     ForeachNode(&glob->data->info->locks, node)
 146         if (node->dir_cluster == de->cluster && node->dir_entry == de->no) {
 147             D(bug("[NTFS] %s: using GlobalLock @ 0x%p\n", __PRETTY_FUNCTION__, node));
 148             gl = node;
 149             break;
 150         }
 151
 152     /* if we do and we're trying for an exclusive lock, then bail out */
 153     if (gl != NULL && access == EXCLUSIVE_LOCK) {
 154         D(bug("[NTFS] %s: can't obtain exclusive lock on already-locked file\n", __PRETTY_FUNCTION__));
 155         return ERROR_OBJECT_IN_USE;
 156     }
 157
 158     /* allocate space for the lock. we do this first so that we don't go to
 159      * all the effort of setting up the global lock only to have to discard it
 160      * if the filelock allocation fails */
 161     if ((fl = _AllocVecPooled(glob->data->info->mem_pool,
 162         sizeof(struct ExtFileLock))) == NULL)
 163         return ERROR_NO_FREE_STORE;
 164
 165     if ((fl->dir = _AllocVecPooled(glob->data->info->mem_pool,
 166         sizeof(struct DirHandle))) == NULL)
 167         return ERROR_NO_FREE_STORE;
 168
 169     memset(fl->dir, 0, sizeof(struct DirHandle));
 170
 171     if ((fl->entry = _AllocVecPooled(glob->data->info->mem_pool,
 172         sizeof(struct DirEntry))) == NULL)
 173         return ERROR_NO_FREE_STORE;
 174
 175     memset(fl->entry, 0, sizeof(struct DirEntry));
 176
 177     fl->data = glob->data;
 178
 179     fl->dir->ioh.mft.mftrec_no = de->cluster / glob->data->mft_size;
 180     InitDirHandle(glob->data, fl->dir, FALSE);
 181
 182     fl->entry->data = de->data;         /* filesystem data */
 183     fl->entry->entryname = AllocVec(strlen(de->entryname) + 1, MEMF_ANY|MEMF_CLEAR);
 184     CopyMem(de->entryname, fl->entry->entryname, strlen(de->entryname));
 185     fl->entry->entrytype = de->entrytype;
 186
 187     fl->entry->no = de->no;
 188
 189     if ((fl->entry->entry = de->entry) == NULL)
 190     {
 191         GetDirEntry(fl->dir, de->no, fl->entry);
 192     }
 193     de->entry = NULL;
 194
 195     fl->entry->cluster = de->cluster;
 196
 197     /* if we don't have a global lock we need to build one */
 198     if (gl == NULL) {
 199         if ((gl = _AllocVecPooled(glob->data->info->mem_pool,
 200             sizeof(struct GlobalLock))) == NULL) {
 201             _FreeVecPooled(glob->data->info->mem_pool, fl);
 202             return ERROR_NO_FREE_STORE;
 203         }
 204
 205         gl->dir_cluster = fl->entry->cluster;
 206         gl->dir_entry = fl->entry->no;
 207         gl->access = access;
 208
 209         gl->first_cluster = fl->entry->entry->mftrec_no * glob->data->mft_size;
 210
 211         gl->attr = fl->entry->entrytype;
 212         if (fl->entry->entry)
 213             gl->size = fl->entry->entry->size;
 214
 215         gl->name[0] = strlen(fl->entry->entryname) + 1;
 216         CopyMem(fl->entry->entryname, &gl->name[1], gl->name[0]);
 217
 218         NEWLIST(&gl->locks);
 219
 220         ADDTAIL(&glob->data->info->locks, gl);
 221
 222         D(bug("[NTFS] %s: created new global lock for '%s'\n", __PRETTY_FUNCTION__, &gl->name[1]));
 223
 224         /* TODO : look through the notify list. if there's any in there that aren't
 225          * currently attached to a global lock, expand them and if they are
 226          * for this file, fill them in */
 227     }
 228
 229     /* now setup the file lock */
 230     fl->fl_Link = BNULL;
 231     fl->fl_Access = access;
 232     fl->fl_Task = glob->ourport;
 233     fl->fl_Volume = MKBADDR(glob->data->doslist);
 234
 235     fl->magic = ID_NTFS_DISK;
 236
 237     fl->pos = 0;
 238
 239     fl->do_notify = FALSE;
 240
 241     fl->gl = gl;
 242     ADDTAIL(&gl->locks, &fl->node);
 243
 244     D(bug("[NTFS] %s: created file lock @ 0x%08x\n", __PRETTY_FUNCTION__, fl));
 245
 246     DumpLocks(glob->data);
 247
 248     *lock = fl;
 249     return 0;
 250 }
 251
 252 LONG LockRoot(LONG access, struct ExtFileLock **lock)
 253 {
 254     struct ExtFileLock *fl;
 255
 256     D(bug("[NTFS]: %s()\n", __PRETTY_FUNCTION__));
 257
 258     if (access == EXCLUSIVE_LOCK) {
 259         D(bug("[NTFS] %s: EXCLUSIVE_LOCK\n", __PRETTY_FUNCTION__));
 260         return ERROR_OBJECT_IN_USE;
 261     }
 262
 263     if ((fl = _AllocVecPooled(glob->data->info->mem_pool,
 264         sizeof(struct ExtFileLock))) == NULL)
 265         return ERROR_NO_FREE_STORE;
 266
 267     if ((fl->dir = _AllocVecPooled(glob->data->info->mem_pool,
 268         sizeof(struct DirHandle))) == NULL)
 269         return ERROR_NO_FREE_STORE;
 270
 271     memset(fl->dir, 0, sizeof(struct DirHandle));
 272
 273     if ((fl->entry = _AllocVecPooled(glob->data->info->mem_pool,
 274         sizeof(struct DirEntry))) == NULL)
 275         return ERROR_NO_FREE_STORE;
 276
 277     memset(fl->entry, 0, sizeof(struct DirEntry));
 278
 279     fl->fl_Link = BNULL;
 280     fl->fl_Key = 0;
 281     fl->fl_Access = SHARED_LOCK;
 282     fl->fl_Task = glob->ourport;
 283     fl->fl_Volume = MKBADDR(glob->data->doslist);
 284
 285     fl->magic = ID_NTFS_DISK;
 286
 287     fl->dir->ioh.mft.data = glob->data;
 288
 289     fl->dir->ioh.mft.mftrec_no = FILE_ROOT;
 290     InitDirHandle(glob->data, fl->dir, FALSE);
 291
 292     fl->pos = 0;
 293
 294     fl->do_notify = FALSE;
 295
 296     if (IsListEmpty(&glob->data->info->root_lock.locks))
 297         ADDTAIL(&glob->data->info->locks, &glob->data->info->root_lock);
 298     fl->gl = &glob->data->info->root_lock;
 299     fl->data = glob->data;
 300     ADDTAIL(&glob->data->info->root_lock.locks, &fl->node);
 301
 302     D(bug("[NTFS] %s: created root lock 0x%08x\n", __PRETTY_FUNCTION__, fl));
 303
 304     DumpLocks(glob->data);
 305
 306     *lock = fl;
 307     return 0;
 308 }
 309
 310 LONG CopyLock(struct ExtFileLock *fl, struct ExtFileLock **lock)
 311 {
 312     struct DirEntry de;
 313     LONG ret;
 314
 315     D(bug("[NTFS]: %s()\n", __PRETTY_FUNCTION__));
 316
 317     if (fl == NULL ||  (fl->gl == &glob->data->info->root_lock))
 318         return LockRoot(SHARED_LOCK, lock);
 319
 320     if (fl->fl_Access == EXCLUSIVE_LOCK) {
 321         D(bug("[NTFS] %s: EXCLUSIVE_LOCK\n", __PRETTY_FUNCTION__));
 322         return ERROR_OBJECT_IN_USE;
 323     }
 324
 325     D(bug("[NTFS] %s: copying lock (dir %ld; entry %ld)\n", __PRETTY_FUNCTION__, fl->gl->dir_cluster / glob->data->mft_size, fl->gl->dir_entry));
 326
 327     memset(&de, 0, sizeof(struct DirEntry));
 328
 329     if (fl->entry)
 330     {
 331         de.cluster = fl->dir->ioh.first_cluster;
 332         de.no = fl->entry->no;
 333     }
 334     else
 335     {
 336         struct DirHandle dh;
 337         dh.ioh.mft.mftrec_no = fl->gl->dir_cluster / glob->data->mft_size;
 338         dh.ioh.mft.buf = NULL;
 339         InitDirHandle(glob->data, &dh, FALSE);
 340         GetDirEntry(&dh, fl->gl->dir_entry, &de);
 341     }
 342     if ((ret = LockFile(&de, SHARED_LOCK, lock)) == 0)
 343     {
 344         fl = *lock;
 345         if (fl->gl->attr & ATTR_DIRECTORY)
 346         {
 347             if (fl->entry)
 348             {
 349                 if (fl->entry->key)
 350                 {
 351                     if ((fl->entry->key->indx) && (fl->entry->key->indx !=fl->dir->ioh.mft.buf))
 352                     {
 353                         D(bug("[NTFS] %s: freeing old key indx buffer @ 0x%p\n", __PRETTY_FUNCTION__, fl->entry->key->indx));
 354                         FreeMem(fl->entry->key->indx, glob->data->idx_size << SECTORSIZE_SHIFT);
 355                         fl->entry->key->indx = NULL;
 356                     }
 357                     D(bug("[NTFS] %s: freeing old key @ 0x%p\n", __PRETTY_FUNCTION__, fl->entry->key));
 358                     FreeMem(fl->entry->key, sizeof(struct Index_Key));
 359                     fl->entry->key = NULL;
 360                 }
 361                 fl->entry = NULL;
 362             }
 363             fl->dir->parent_mft = fl->dir->ioh.mft.mftrec_no;
 364             fl->dir->ioh.mft.mftrec_no = fl->gl->first_cluster / glob->data->mft_size;
 365             ReleaseDirHandle(fl->dir);
 366             InitDirHandle(glob->data, fl->dir, FALSE);
 367         }
 368     }
 369     return ret;
 370 }
 371
 372 void FreeLock(struct ExtFileLock *fl)
 373 {
 374     struct NotifyNode *nn;
 375
 376     D(bug("[NTFS]: %s()\n", __PRETTY_FUNCTION__));
 377
 378     if (fl == NULL)
 379         return;
 380
 381     D(bug("[NTFS] %s: lock @ 0x%08x\n", __PRETTY_FUNCTION__, fl));
 382
 383     if (fl->do_notify)
 384         SendNotifyByLock(fl->dir->ioh.data, fl->gl);
 385
 386     REMOVE(&fl->node);
 387
 388     if (IsListEmpty(&fl->gl->locks))
 389     {
 390         REMOVE(fl->gl);
 391
 392         ForeachNode(&fl->data->info->notifies, nn)
 393             if(nn->gl == fl->gl)
 394                 nn->gl = NULL;
 395
 396         if (fl->gl != &fl->data->info->root_lock)
 397             _FreeVecPooled(glob->data->info->mem_pool, fl->gl);
 398
 399         D(bug("[NTFS] %s: freed associated global lock\n", __PRETTY_FUNCTION__));
 400     }
 401
 402     DumpLocks(fl->data);
 403
 404     if (fl->entry != NULL)
 405     {
 406         FreeVec(fl->entry->entryname);
 407         fl->entry->entryname = NULL;
 408
 409         if (fl->entry->entry != NULL)
 410         {
 411             if (fl->entry->entry->cblock != NULL)
 412             {
 413                 Cache_FreeBlock(fl->data->cache, fl->entry->entry->cblock);
 414                 fl->entry->entry->cblock = NULL;
 415
 416                 if (fl->entry->entry->buf != NULL)
 417                 {
 418                     FreeMem(fl->entry->entry->buf, glob->data->mft_size << SECTORSIZE_SHIFT);
 419                     fl->entry->entry->buf = NULL;
 420                 }
 421             }
 422             FreeMem(fl->entry->entry, sizeof (struct NTFSMFTEntry));
 423             fl->entry->entry = NULL;
 424         }
 425         if (fl->entry->key != NULL)
 426         {
 427             if ((fl->entry->key->indx != NULL) && (fl->entry->key->indx != fl->dir->ioh.mft.buf))
 428             {
 429                 D(bug("[NTFS] %s: freeing old key indx buffer @ 0x%p\n", __PRETTY_FUNCTION__, fl->entry->key->indx));
 430                 FreeMem(fl->entry->key->indx, glob->data->idx_size << SECTORSIZE_SHIFT);
 431                 fl->entry->key->indx = NULL;
 432             }
 433             D(bug("[NTFS] %s: freeing old key @ 0x%p\n", __PRETTY_FUNCTION__, fl->entry->key));
 434             FreeMem(fl->entry->key, sizeof(struct Index_Key));
 435             fl->entry->key = NULL;
 436         }
 437         _FreeVecPooled(glob->data->info->mem_pool, fl->entry);
 438         fl->entry = NULL;
 439     }
 440
 441     if (fl->dir)
 442     {
 443         if (fl->dir->ioh.mft.cblock != NULL)
 444         {
 445             Cache_FreeBlock(fl->data->cache, fl->dir->ioh.mft.cblock);
 446             fl->dir->ioh.mft.cblock = NULL;
 447
 448             if (fl->dir->ioh.mft.buf)
 449             {
 450                 FreeMem(fl->dir->ioh.mft.buf, glob->data->mft_size << SECTORSIZE_SHIFT);
 451                 fl->dir->ioh.mft.buf = NULL;
 452             }
 453         }
 454         if (!(fl->dir->ioh.bitmap))
 455         {
 456             FreeVec(fl->dir->ioh.bitmap);
 457             fl->dir->ioh.bitmap = NULL;
 458         }
 459         _FreeVecPooled(glob->data->info->mem_pool, fl->dir);
 460         fl->dir = NULL;
 461     }
 462
 463     if (fl->data != glob->data)
 464         AttemptDestroyVolume(fl->data);
 465
 466     _FreeVecPooled(glob->data->info->mem_pool, fl);
 467 }
 468