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1/*␊
2 * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * The contents of this file constitute Original Code as defined in and␊
7 * are subject to the Apple Public Source License Version 2.0 (the␊
8 * "License"). You may not use this file except in compliance with the␊
9 * License. Please obtain a copy of the License at␊
10 * http://www.apple.com/publicsource and read it before using this file.␊
11 * ␊
12 * This Original Code and all software distributed under the License are␊
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the␊
17 * License for the specific language governing rights and limitations␊
18 * under the License.␊
19 * ␊
20 * @APPLE_LICENSE_HEADER_END@␊
21 */␊
22/*␊
23 * ufs.c - File System Module for UFS.␊
24 *␊
25 * Copyright (c) 1998-2002 Apple Computer, Inc.␊
26 *␊
27 * DRI: Josh de Cesare␊
28 */␊
29#include "sl.h"␊
30␊
31#include "ufs.h"␊
32#include "ufs_byteorder.h"␊
33␊
34#if !defined(MAXNAMLEN) && defined(UFSMAXNAMLEN)␊
35#define MAXNAMLEN UFSMAXNAMLEN␊
36#endif␊
37␊
38typedef struct dinode Inode, *InodePtr;␊
39␊
40// Private function prototypes␊
41␊
42static char *ReadBlock(long fragNum, long fragOffset, long length,␊
43 char *buffer, long cache);␊
44static long ReadInode(long inodeNum, InodePtr inode, long *flags, long *time);␊
45static long ResolvePathToInode(char *filePath, long *flags,␊
46 InodePtr fileInode, InodePtr dirInode);␊
47static long ReadDirEntry(InodePtr dirInode, long *fileInodeNum,␊
48 long long *dirIndex, char **name);␊
49static long FindFileInDir(char *fileName, long *flags,␊
50 InodePtr fileInode, InodePtr dirInode);␊
51static char *ReadFileBlock(InodePtr fileInode, long fragNum, long blockOffset,␊
52 long length, char *buffer, long cache);␊
53static long ReadFile(InodePtr fileInode, uint64_t *length, void *base, uint64_t offset);␊
54␊
55#define kDevBlockSize (0x200) // Size of each disk block.␊
56#define kDiskLabelBlock (15) // Block the DL is in.␊
57␊
58#ifdef __i386__␊
59␊
60static CICell gCurrentIH;␊
61static long long gPartitionBase;␊
62static char *gULBuf;␊
63static char *gFSBuf;␊
64static struct fs *gFS;␊
65#if !BOOT1␊
66static struct ufslabel gUFSLabel; // for UUID␊
67#endif␊
68static long gBlockSize;␊
69static long gFragSize;␊
70static long gFragsPerBlock;␊
71static char *gTempBlock;␊
72static char *gTempName;␊
73static char *gTempName2;␊
74static InodePtr gRootInodePtr;␊
75static InodePtr gFileInodePtr;␊
76␊
77#else /* !__i386__ */␊
78␊
79static CICell gCurrentIH;␊
80static long long gPartitionBase;␊
81static char gDLBuf[8192];␊
82static char gFSBuf[SBSIZE];␊
83static struct fs *gFS;␊
84#if !BOOT1␊
85static struct ufslabel gUFSLabel; // for UUID␊
86#endif␊
87static long gBlockSize;␊
88static long gFragSize;␊
89static long gFragsPerBlock;␊
90static char *gTempBlock;␊
91static char gTempName[MAXNAMLEN + 1];␊
92static char gTempName2[MAXNAMLEN + 1];␊
93static Inode _gRootInode;␊
94static Inode _gFileInode;␊
95static InodePtr gRootInodePtr = &_gRootInode;␊
96static InodePtr gFileInodePtr = &_gFileInode;␊
97␊
98#endif /* !__i386__ */␊
99␊
100// Public functions␊
101␊
102void UFSFree(CICell ih)␊
103{␊
104 if(gCurrentIH == ih)␊
105 gCurrentIH = 0;␊
106 free(ih);␊
107}␊
108␊
109long UFSInitPartition( CICell ih )␊
110{␊
111#if !BOOT1␊
112 long ret;␊
113#endif␊
114␊
115 if (ih == gCurrentIH) {␊
116#ifdef __i386__␊
117 CacheInit(ih, gBlockSize);␊
118#endif␊
119 return 0;␊
120 }␊
121␊
122#if !BOOT1␊
123 verbose("UFSInitPartition: %x\n", ih);␊
124#endif␊
125␊
126 gCurrentIH = 0;␊
127␊
128#ifdef __i386__␊
129 if (!gULBuf) gULBuf = (char *) malloc(UFS_LABEL_SIZE);␊
130 if (!gFSBuf) gFSBuf = (char *) malloc(SBSIZE);␊
131 if (!gTempName) gTempName = (char *) malloc(MAXNAMLEN + 1);␊
132 if (!gTempName2) gTempName2 = (char *) malloc(MAXNAMLEN + 1);␊
133 if (!gRootInodePtr) gRootInodePtr = (InodePtr) malloc(sizeof(Inode));␊
134 if (!gFileInodePtr) gFileInodePtr = (InodePtr) malloc(sizeof(Inode));␊
135 if (!gULBuf || !gFSBuf || !gTempName || !gTempName2 ||␊
136 !gRootInodePtr || !gFileInodePtr) return -1;␊
137#endif␊
138␊
139 // Assume there is no Disk Label␊
140 gPartitionBase = 0;␊
141␊
142#if !BOOT1␊
143 // read the disk label to get the UUID␊
144 // (rumor has it that UFS headers can be either-endian on disk; hopefully␊
145 // that isn't true for this UUID field).␊
146 Seek(ih, gPartitionBase + UFS_LABEL_OFFSET);␊
147 ret = Read(ih, (long)&gUFSLabel, UFS_LABEL_SIZE);␊
148 if(ret != 0)␊
149 bzero(&gUFSLabel, UFS_LABEL_SIZE);␊
150#endif /* !BOOT1 */␊
151␊
152 // Look for the Super Block␊
153 Seek(ih, gPartitionBase + SBOFF);␊
154 Read(ih, (long)gFSBuf, SBSIZE);␊
155␊
156 gFS = (struct fs *)gFSBuf;␊
157 byte_swap_superblock(gFS);␊
158␊
159 if (gFS->fs_magic != FS_MAGIC) {␊
160 return -1;␊
161 }␊
162␊
163␉ih->modTime = gFS->fs_time;␊
164␉␊
165 // Calculate the block size and set up the block cache.␊
166 gBlockSize = gFS->fs_bsize;␊
167 gFragSize = gFS->fs_fsize;␊
168 gFragsPerBlock = gBlockSize / gFragSize;␊
169 if (gTempBlock != 0) free(gTempBlock);␊
170 gTempBlock = malloc(gBlockSize);␊
171 CacheInit(ih, gBlockSize);␊
172␊
173 gCurrentIH = ih;␊
174␊
175 // Read the Root Inode␊
176 ReadInode(ROOTINO, gRootInodePtr, 0, 0);␊
177␊
178 return 0;␊
179}␊
180␊
181#if !BOOT1␊
182␊
183long UFSGetUUID(CICell ih, char *uuidStr)␊
184{␊
185 long long uuid = gUFSLabel.ul_uuid;␊
186␊
187 if (UFSInitPartition(ih) == -1) return -1;␊
188 if (uuid == 0LL) return -1;␊
189␊
190 return CreateUUIDString((uint8_t*)(&uuid), sizeof(uuid), uuidStr);␊
191}␊
192␊
193#endif /* !BOOT1 */␊
194␊
195long UFSLoadFile( CICell ih, char * filePath )␊
196{␊
197␉return UFSReadFile(ih, filePath, (void *)(uint32_t)get_env(envgFSLoadAddress), 0, 0);␊
198␊
199}␊
200␊
201long UFSReadFile( CICell ih, char * filePath, void * base, uint64_t offset, uint64_t length )␊
202{␊
203 long ret, flags;␊
204␊
205#if !BOOT1␊
206 verbose("Loading UFS file: [%s] from %x.\n", filePath, (unsigned)ih);␊
207#endif␊
208␊
209 if (UFSInitPartition(ih) == -1) return -1;␊
210␊
211 // Skip one or two leading '/'.␊
212 if (*filePath == '/') filePath++;␊
213 if (*filePath == '/') filePath++;␊
214␊
215 ret = ResolvePathToInode(filePath, &flags, gFileInodePtr, gRootInodePtr);␊
216 if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) return -1;␊
217␊
218 ret = ReadFile(gFileInodePtr, &length, base, offset);␊
219 if (ret == -1) return -1;␊
220 ␊
221 return length;␊
222}␊
223␊
224#ifndef BOOT1␊
225␊
226long UFSGetDirEntry( CICell ih, char * dirPath, long long * dirIndex,␊
227 char ** name, long * flags, long * time,␊
228 FinderInfo * finderInfo, long * infoValid)␊
229{␊
230 long ret, fileInodeNum, dirFlags;␊
231 Inode tmpInode;␊
232␊
233 if (UFSInitPartition(ih) == -1) return -1;␊
234␊
235 if (infoValid) *infoValid = 0;␊
236␊
237 // Skip a leading '/' if present␊
238 if (*dirPath == '/') dirPath++;␊
239 if (*dirPath == '/') dirPath++;␊
240␊
241 ret = ResolvePathToInode(dirPath, &dirFlags, gFileInodePtr, gRootInodePtr);␊
242 if ((ret == -1) || ((dirFlags & kFileTypeMask) != kFileTypeDirectory))␊
243 return -1;␊
244␊
245 ret = ReadDirEntry(gFileInodePtr, &fileInodeNum, dirIndex, name);␊
246 if (ret != 0) return ret;␊
247␊
248 ReadInode(fileInodeNum, &tmpInode, flags, time);␊
249␊
250 return 0;␊
251}␊
252␊
253void␊
254UFSGetDescription(CICell ih, char *str, long strMaxLen)␊
255{␊
256 if (UFSInitPartition(ih) == -1) { return; }␊
257␊
258 struct ufslabel *ul;␊
259␊
260 // Look for the Disk Label␊
261 Seek(ih, 1ULL * UFS_LABEL_OFFSET);␊
262 Read(ih, (long)gULBuf, UFS_LABEL_SIZE);␊
263 ␊
264 ul = (struct ufslabel *)gULBuf;␊
265 ␊
266 unsigned char magic_bytes[] = UFS_LABEL_MAGIC;␊
267 int i;␊
268 unsigned char *p = (unsigned char *)&ul->ul_magic;␊
269 ␊
270 for (i=0; i<sizeof(magic_bytes); i++, p++) {␊
271 if (*p != magic_bytes[i])␊
272 return;␊
273 }␊
274 strncpy(str, (const char *)ul->ul_name, strMaxLen);␊
275}␊
276␊
277long␊
278UFSGetFileBlock(CICell ih, char *filePath, unsigned long long *firstBlock)␊
279{␊
280 long ret, flags;␊
281␊
282 if (UFSInitPartition(ih) == -1) return -1;␊
283␊
284 // Skip one or two leading '/'.␊
285 if (*filePath == '/') filePath++;␊
286 if (*filePath == '/') filePath++;␊
287␊
288 ret = ResolvePathToInode(filePath, &flags, gFileInodePtr, gRootInodePtr);␊
289 if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) return -1;␊
290␊
291 *firstBlock = (gPartitionBase + 1ULL * gFileInodePtr->di_db[0] * gBlockSize) / 512ULL;␊
292␊
293 return 0;␊
294}␊
295␊
296␊
297#endif /* !BOOT1 */␊
298␊
299// Private functions␊
300␊
301static char * ReadBlock( long fragNum, long blockOffset, long length,␊
302 char * buffer, long cache )␊
303{␊
304 long long offset;␊
305 long blockNum;␊
306␊
307 blockNum = fragNum / gFragsPerBlock;␊
308 fragNum -= blockNum * gFragsPerBlock;␊
309 ␊
310 blockOffset += fragNum * gFragSize;␊
311 ␊
312 offset = gPartitionBase + 1ULL * blockNum * gBlockSize;␊
313␊
314 if (cache && ((blockOffset + length) <= gBlockSize)) {␊
315 CacheRead(gCurrentIH, gTempBlock, offset, gBlockSize, 1);␊
316 if (buffer != 0) bcopy(gTempBlock + blockOffset, buffer, length);␊
317 else buffer = gTempBlock + blockOffset;␊
318 } else {␊
319 offset += blockOffset;␊
320 CacheRead(gCurrentIH, buffer, offset, length, 0);␊
321 }␊
322␊
323 return buffer;␊
324}␊
325␊
326static long ReadInode( long inodeNum, InodePtr inode, long * flags, long * time )␊
327{␊
328 long fragNum = ino_to_fsba(gFS, inodeNum);␊
329 long blockOffset = ino_to_fsbo(gFS, inodeNum) * sizeof(Inode);␊
330␊
331 ReadBlock(fragNum, blockOffset, sizeof(Inode), (char *)inode, 1);␊
332 byte_swap_dinode_in(inode);␊
333␊
334 if (time != 0) *time = inode->di_mtime;␊
335␊
336 if (flags != 0) {␊
337 switch (inode->di_mode & IFMT) {␊
338 case IFREG: *flags = kFileTypeFlat; break;␊
339 case IFDIR: *flags = kFileTypeDirectory; break;␊
340 case IFLNK: *flags = kFileTypeLink; break;␊
341 default : *flags = kFileTypeUnknown; break;␊
342 }␊
343␊
344 *flags |= inode->di_mode & kPermMask;␊
345␊
346 if (inode->di_uid != 0) *flags |= kOwnerNotRoot;␊
347 }␊
348␊
349 return 0;␊
350}␊
351␊
352static long ResolvePathToInode( char * filePath, long * flags,␊
353 InodePtr fileInode, InodePtr dirInode )␊
354{␊
355 char * restPath;␊
356 long ret, cnt;␊
357␊
358 // if filePath is empty the we want this directory.␊
359 if (*filePath == '\0') {␊
360 bcopy((char *)dirInode, (char *)fileInode, sizeof(Inode));␊
361 return 0;␊
362 }␊
363␊
364 // Copy the file name to gTempName␊
365 cnt = 0;␊
366 while ((filePath[cnt] != '/') && (filePath[cnt] != '\0')) cnt++;␊
367 strlcpy(gTempName, filePath, cnt+1);␊
368␊
369 // Move restPath to the right place.␊
370 if (filePath[cnt] != '\0') cnt++;␊
371 restPath = filePath + cnt;␊
372␊
373 // gTempName is a name in the current Dir.␊
374 // restPath is the rest of the path if any.␊
375␊
376 ret = FindFileInDir(gTempName, flags, fileInode, dirInode);␊
377 if (ret == -1) return -1;␊
378␊
379 if ((*restPath != '\0') && ((*flags & kFileTypeMask) == kFileTypeDirectory))␊
380 ret = ResolvePathToInode(restPath, flags, fileInode, fileInode);␊
381␊
382 return ret;␊
383}␊
384␊
385static long ReadDirEntry( InodePtr dirInode, long * fileInodeNum,␊
386 long long * dirIndex, char ** name )␊
387{␊
388 struct direct *dir;␊
389 char *buffer;␊
390 long long index;␊
391 long dirBlockNum, dirBlockOffset;␊
392␊
393 while (1) {␊
394 index = *dirIndex;␊
395 ␊
396 dirBlockOffset = (long) (index % DIRBLKSIZ);␊
397 dirBlockNum = (long) (index / DIRBLKSIZ);␊
398␊
399 buffer = ReadFileBlock(dirInode, dirBlockNum, 0, DIRBLKSIZ, 0, 1);␊
400 if (buffer == 0) return -1;␊
401␊
402 dir = (struct direct *)(buffer + dirBlockOffset);␊
403 byte_swap_dir_block_in((char *)dir, 1);␊
404␊
405 *dirIndex += dir->d_reclen;␊
406 ␊
407 if (dir->d_ino != 0) break;␊
408 ␊
409 if (dirBlockOffset != 0) return -1;␊
410 }␊
411␊
412 *fileInodeNum = dir->d_ino;␊
413 *name = strlcpy(gTempName2, dir->d_name, dir->d_namlen+1);␊
414␊
415 return 0;␊
416}␊
417␊
418static long FindFileInDir( char * fileName, long * flags,␊
419 InodePtr fileInode, InodePtr dirInode )␊
420{␊
421 long ret, inodeNum;␊
422 long long index = 0;␊
423 char *name;␊
424␊
425 while (1) {␊
426 ret = ReadDirEntry(dirInode, &inodeNum, &index, &name);␊
427 if (ret == -1) return -1;␊
428␊
429 if (strcmp(fileName, name) == 0) break;␊
430 }␊
431␊
432 ReadInode(inodeNum, fileInode, flags, 0);␊
433␊
434 return 0;␊
435}␊
436␊
437static char * ReadFileBlock( InodePtr fileInode, long fragNum, long blockOffset,␊
438 long length, char * buffer, long cache )␊
439{␊
440 long fragCount, blockNum;␊
441 long diskFragNum, indFragNum, indBlockOff, refsPerBlock;␊
442 char *indBlock;␊
443␊
444 fragCount = (fileInode->di_size + gFragSize - 1) / gFragSize;␊
445 if (fragNum >= fragCount) return 0;␊
446␊
447 refsPerBlock = gBlockSize / sizeof(ufs_daddr_t);␊
448␊
449 blockNum = fragNum / gFragsPerBlock;␊
450 fragNum -= blockNum * gFragsPerBlock;␊
451 ␊
452 // Get Direct Block Number.␊
453 if (blockNum < NDADDR) {␊
454 diskFragNum = fileInode->di_db[blockNum];␊
455 } else {␊
456 blockNum -= NDADDR;␊
457␊
458 // Get Single Indirect Fragment Number.␊
459 if (blockNum < refsPerBlock) {␊
460 indFragNum = fileInode->di_ib[0];␊
461 } else {␊
462 blockNum -= refsPerBlock;␊
463␊
464 // Get Double Indirect Fragment Number.␊
465 if (blockNum < (refsPerBlock * refsPerBlock)) {␊
466 indFragNum = fileInode->di_ib[1];␊
467 } else {␊
468 blockNum -= refsPerBlock * refsPerBlock;␊
469␊
470 // Get Triple Indirect Fragment Number.␊
471 indFragNum = fileInode->di_ib[2];␊
472␊
473 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
474 indBlockOff = blockNum / (refsPerBlock * refsPerBlock);␊
475 blockNum %= (refsPerBlock * refsPerBlock);␊
476 indFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[indBlockOff]);␊
477 }␊
478␊
479 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
480 indBlockOff = blockNum / refsPerBlock;␊
481 blockNum %= refsPerBlock;␊
482 indFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[indBlockOff]);␊
483 }␊
484␊
485 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
486 diskFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[blockNum]);␊
487 }␊
488␊
489 buffer = ReadBlock(diskFragNum+fragNum, blockOffset, length, buffer, cache);␊
490␊
491 return buffer;␊
492}␊
493␊
494static long ReadFile( InodePtr fileInode, uint64_t * length, void * base, uint64_t offset )␊
495{␊
496 long bytesLeft, curSize, curFrag;␊
497 char *buffer, *curAddr = (char *)base;␊
498␊
499 bytesLeft = fileInode->di_size;␊
500␊
501 if (offset > bytesLeft) {␊
502 printf("Offset is too large.\n");␊
503 return -1;␊
504 }␊
505␊
506 if ((*length == 0) || ((offset + *length) > bytesLeft)) {␊
507 *length = bytesLeft - offset;␊
508 }␊
509/*␊
510 if (bytesLeft > kLoadSize) {␊
511 printf("File is too large.\n");␊
512 return -1;␊
513 }␊
514*/␊
515 bytesLeft = *length;␊
516 curFrag = (offset / gBlockSize) * gFragsPerBlock;␊
517 offset %= gBlockSize;␊
518␊
519 while (bytesLeft) {␊
520 curSize = gBlockSize;␊
521 if (curSize > bytesLeft) curSize = bytesLeft;␊
522 if ((offset + curSize) > gBlockSize) curSize = (gBlockSize - offset);␊
523␊
524 buffer = ReadFileBlock(fileInode, curFrag, offset, curSize, curAddr, 0);␊
525 if (buffer == 0) break;␊
526␊
527 if (offset != 0) offset = 0;␊
528␊
529 curFrag += gFragsPerBlock;␊
530 curAddr += curSize;␊
531 bytesLeft -= curSize;␊
532 }␊
533␊
534 return bytesLeft;␊
535}

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