FatPkg/EnhancedFatDxe/Open.c

   1 /*++
   2
   3 Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials are licensed and made available
   5 under the terms and conditions of the BSD License which accompanies this
   6 distribution. The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   open.c
  16
  17 Abstract:
  18
  19   Routines dealing with file open
  20
  21 Revision History
  22
  23 --*/
  24
  25 #include "Fat.h"
  26
  27 EFI_STATUS
  28 FatAllocateIFile (
  29   IN FAT_OFILE    *OFile,
  30   OUT FAT_IFILE   **PtrIFile
  31   )
  32 /*++
  33
  34 Routine Description:
  35
  36   Create an Open instance for the existing OFile.
  37   The IFile of the newly opened file is passed out.
  38
  39 Arguments:
  40
  41   OFile                 - The file that serves as a starting reference point.
  42   PtrIFile              - The newly generated IFile instance.
  43
  44 Returns:
  45
  46   EFI_OUT_OF_RESOURCES  - Can not allocate the memory for the IFile
  47   EFI_SUCCESS           - Create the new IFile for the OFile successfully
  48
  49 --*/
  50 {
  51   FAT_IFILE *IFile;
  52
  53   ASSERT_VOLUME_LOCKED (OFile->Volume);
  54
  55   //
  56   // Allocate a new open instance
  57   //
  58   IFile = AllocateZeroPool (sizeof (FAT_IFILE));
  59   if (IFile == NULL) {
  60     return EFI_OUT_OF_RESOURCES;
  61   }
  62
  63   IFile->Signature = FAT_IFILE_SIGNATURE;
  64
  65   CopyMem (&(IFile->Handle), &FatFileInterface, sizeof (EFI_FILE_PROTOCOL));
  66
  67   //
  68   // Report the correct revision number based on the DiskIo2 availability
  69   //
  70   if (OFile->Volume->DiskIo2 != NULL) {
  71     IFile->Handle.Revision = EFI_FILE_PROTOCOL_REVISION2;
  72   } else {
  73     IFile->Handle.Revision = EFI_FILE_PROTOCOL_REVISION;
  74   }
  75
  76   IFile->OFile = OFile;
  77   InsertTailList (&OFile->Opens, &IFile->Link);
  78   InitializeListHead (&IFile->Tasks);
  79
  80   *PtrIFile = IFile;
  81   return EFI_SUCCESS;
  82 }
  83
  84 EFI_STATUS
  85 FatOFileOpen (
  86   IN  FAT_OFILE            *OFile,
  87   OUT FAT_IFILE            **NewIFile,
  88   IN  CHAR16               *FileName,
  89   IN  UINT64               OpenMode,
  90   IN  UINT8                Attributes
  91   )
  92 /*++
  93
  94 Routine Description:
  95
  96   Open a file for a file name relative to an existing OFile.
  97   The IFile of the newly opened file is passed out.
  98
  99 Arguments:
 100
 101   OFile                 - The file that serves as a starting reference point.
 102   NewIFile              - The newly generated IFile instance.
 103   FileName              - The file name relative to the OFile.
 104   OpenMode              - Open mode.
 105   Attributes            - Attributes to set if the file is created.
 106
 107 Returns:
 108
 109   EFI_SUCCESS           - Open the file successfully.
 110   EFI_INVALID_PARAMETER - The open mode is conflict with the attributes
 111                           or the file name is not valid.
 112   EFI_NOT_FOUND         - Conficts between dir intention and attribute.
 113   EFI_WRITE_PROTECTED   - Can't open for write if the volume is read only.
 114   EFI_ACCESS_DENIED     - If the file's attribute is read only, and the
 115                           open is for read-write fail it.
 116   EFI_OUT_OF_RESOURCES  - Can not allocate the memory.
 117
 118 --*/
 119 {
 120   FAT_VOLUME  *Volume;
 121   EFI_STATUS  Status;
 122   CHAR16      NewFileName[EFI_PATH_STRING_LENGTH];
 123   FAT_DIRENT  *DirEnt;
 124   UINT8       FileAttributes;
 125   BOOLEAN     WriteMode;
 126
 127   Volume = OFile->Volume;
 128   ASSERT_VOLUME_LOCKED (Volume);
 129   WriteMode = (BOOLEAN) (OpenMode & EFI_FILE_MODE_WRITE);
 130   if (Volume->ReadOnly && WriteMode) {
 131     return EFI_WRITE_PROTECTED;
 132   }
 133   //
 134   // Verify the source file handle isn't in an error state
 135   //
 136   Status = OFile->Error;
 137   if (EFI_ERROR (Status)) {
 138     return Status;
 139   }
 140   //
 141   // Get new OFile for the file
 142   //
 143   Status = FatLocateOFile (&OFile, FileName, Attributes, NewFileName);
 144   if (EFI_ERROR (Status)) {
 145     return Status;
 146   }
 147
 148   if (*NewFileName != 0) {
 149     //
 150     // If there's a remaining part of the name, then we had
 151     // better be creating the file in the directory
 152     //
 153     if ((OpenMode & EFI_FILE_MODE_CREATE) == 0) {
 154       return EFI_NOT_FOUND;
 155     }
 156
 157     Status = FatCreateDirEnt (OFile, NewFileName, Attributes, &DirEnt);
 158     if (EFI_ERROR (Status)) {
 159       return Status;
 160     }
 161
 162     Status = FatOpenDirEnt (OFile, DirEnt);
 163     if (EFI_ERROR (Status)) {
 164       return Status;
 165     }
 166
 167     OFile = DirEnt->OFile;
 168     if (OFile->ODir != NULL) {
 169       //
 170       // If we just created a directory, we need to create "." and ".."
 171       //
 172       Status = FatCreateDotDirEnts (OFile);
 173       if (EFI_ERROR (Status)) {
 174         return Status;
 175       }
 176     }
 177   }
 178   //
 179   // If the file's attribute is read only, and the open is for
 180   // read-write, then the access is denied.
 181   //
 182   FileAttributes = OFile->DirEnt->Entry.Attributes;
 183   if ((FileAttributes & EFI_FILE_READ_ONLY) != 0 && (FileAttributes & FAT_ATTRIBUTE_DIRECTORY) == 0 && WriteMode) {
 184     return EFI_ACCESS_DENIED;
 185   }
 186   //
 187   // Create an open instance of the OFile
 188   //
 189   Status = FatAllocateIFile (OFile, NewIFile);
 190   if (EFI_ERROR (Status)) {
 191     return Status;
 192   }
 193
 194   (*NewIFile)->ReadOnly = (BOOLEAN)!WriteMode;
 195
 196   DEBUG ((EFI_D_INFO, "FSOpen: Open '%S' %r\n", FileName, Status));
 197   return FatOFileFlush (OFile);
 198 }
 199
 200 EFI_STATUS
 201 FatOpenEx (
 202   IN  EFI_FILE_PROTOCOL       *FHand,
 203   OUT EFI_FILE_PROTOCOL       **NewHandle,
 204   IN  CHAR16                  *FileName,
 205   IN  UINT64                  OpenMode,
 206   IN  UINT64                  Attributes,
 207   IN OUT EFI_FILE_IO_TOKEN    *Token
 208   )
 209 /*++
 210 Routine Description:
 211
 212   Implements OpenEx() of Simple File System Protocol.
 213
 214 Arguments:
 215
 216   FHand                 - File handle of the file serves as a starting reference point.
 217   NewHandle             - Handle of the file that is newly opened.
 218   FileName              - File name relative to FHand.
 219   OpenMode              - Open mode.
 220   Attributes            - Attributes to set if the file is created.
 221   Token                 - A pointer to the token associated with the transaction.
 222
 223 Returns:
 224
 225   EFI_INVALID_PARAMETER - The FileName is NULL or the file string is empty.
 226                           The OpenMode is not supported.
 227                           The Attributes is not the valid attributes.
 228   EFI_OUT_OF_RESOURCES  - Can not allocate the memory for file string.
 229   EFI_SUCCESS           - Open the file successfully.
 230   Others                - The status of open file.
 231
 232 --*/
 233 {
 234   FAT_IFILE   *IFile;
 235   FAT_IFILE   *NewIFile;
 236   FAT_OFILE   *OFile;
 237   EFI_STATUS  Status;
 238   FAT_TASK    *Task;
 239
 240   //
 241   // Perform some parameter checking
 242   //
 243   if (FileName == NULL) {
 244     return EFI_INVALID_PARAMETER;
 245   }
 246   //
 247   // Check for a valid mode
 248   //
 249   switch (OpenMode) {
 250   case EFI_FILE_MODE_READ:
 251   case EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE:
 252   case EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE:
 253     break;
 254
 255   default:
 256     return EFI_INVALID_PARAMETER;
 257   }
 258
 259   //
 260   // Check for valid Attributes for file creation case.
 261   //
 262   if (((OpenMode & EFI_FILE_MODE_CREATE) != 0) && (Attributes & (EFI_FILE_READ_ONLY | (~EFI_FILE_VALID_ATTR))) != 0) {
 263     return EFI_INVALID_PARAMETER;
 264   }
 265
 266   IFile = IFILE_FROM_FHAND (FHand);
 267   OFile = IFile->OFile;
 268   Task  = NULL;
 269
 270   if (Token == NULL) {
 271     FatWaitNonblockingTask (IFile);
 272   } else {
 273     //
 274     // Caller shouldn't call the non-blocking interfaces if the low layer doesn't support DiskIo2.
 275     // But if it calls, the below check can avoid crash.
 276     //
 277     if (FHand->Revision < EFI_FILE_PROTOCOL_REVISION2) {
 278       return EFI_UNSUPPORTED;
 279     }
 280     Task = FatCreateTask (IFile, Token);
 281     if (Task == NULL) {
 282       return EFI_OUT_OF_RESOURCES;
 283     }
 284   }
 285
 286   //
 287   // Lock
 288   //
 289   FatAcquireLock ();
 290
 291   //
 292   // Open the file
 293   //
 294   Status = FatOFileOpen (OFile, &NewIFile, FileName, OpenMode, (UINT8) Attributes);
 295
 296   //
 297   // If the file was opened, return the handle to the caller
 298   //
 299   if (!EFI_ERROR (Status)) {
 300     *NewHandle = &NewIFile->Handle;
 301   }
 302   //
 303   // Unlock
 304   //
 305   Status = FatCleanupVolume (OFile->Volume, NULL, Status, Task);
 306   FatReleaseLock ();
 307
 308   if (Token != NULL) {
 309     if (!EFI_ERROR (Status)) {
 310       Status = FatQueueTask (IFile, Task);
 311     } else {
 312       FatDestroyTask (Task);
 313     }
 314   }
 315
 316   return Status;
 317 }
 318
 319 EFI_STATUS
 320 EFIAPI
 321 FatOpen (
 322   IN  EFI_FILE_PROTOCOL   *FHand,
 323   OUT EFI_FILE_PROTOCOL   **NewHandle,
 324   IN  CHAR16              *FileName,
 325   IN  UINT64              OpenMode,
 326   IN  UINT64              Attributes
 327   )
 328 /*++
 329 Routine Description:
 330
 331   Implements Open() of Simple File System Protocol.
 332
 333 Arguments:
 334
 335   FHand                 - File handle of the file serves as a starting reference point.
 336   NewHandle             - Handle of the file that is newly opened.
 337   FileName              - File name relative to FHand.
 338   OpenMode              - Open mode.
 339   Attributes            - Attributes to set if the file is created.
 340
 341 Returns:
 342
 343   EFI_INVALID_PARAMETER - The FileName is NULL or the file string is empty.
 344                           The OpenMode is not supported.
 345                           The Attributes is not the valid attributes.
 346   EFI_OUT_OF_RESOURCES  - Can not allocate the memory for file string.
 347   EFI_SUCCESS           - Open the file successfully.
 348   Others                - The status of open file.
 349
 350 --*/
 351 {
 352   return FatOpenEx (FHand, NewHandle, FileName, OpenMode, Attributes, NULL);
 353 }