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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, long strMaxLen)␊
184{␊
185 (void)strMaxLen;␊
186 ␊
187 long long uuid = gUFSLabel.ul_uuid;␊
188␊
189 if (UFSInitPartition(ih) == -1) return -1;␊
190 if (uuid == 0LL) return -1;␊
191␊
192 return CreateUUIDString((uint8_t*)(&uuid), sizeof(uuid), uuidStr, strMaxLen);␊
193}␊
194␊
195#endif /* !BOOT1 */␊
196␊
197long UFSLoadFile( CICell ih, char * filePath )␊
198{␊
199␉return UFSReadFile(ih, filePath, (void *)(uint32_t)get_env(envgFSLoadAddress), 0, 0);␊
200␊
201}␊
202␊
203long UFSReadFile( CICell ih, char * filePath, void * base, uint64_t offset, uint64_t length )␊
204{␊
205 long ret, flags;␊
206␊
207#if !BOOT1␊
208 verbose("Loading UFS file: [%s] from %x.\n", filePath, (unsigned)ih);␊
209#endif␊
210␊
211 if (UFSInitPartition(ih) == -1) return -1;␊
212␊
213 // Skip one or two leading '/'.␊
214 if (*filePath == '/') filePath++;␊
215 if (*filePath == '/') filePath++;␊
216␊
217 ret = ResolvePathToInode(filePath, &flags, gFileInodePtr, gRootInodePtr);␊
218 if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) return -1;␊
219␊
220 ret = ReadFile(gFileInodePtr, &length, base, offset);␊
221 if (ret == -1) return -1;␊
222 ␊
223 return length;␊
224}␊
225␊
226#ifndef BOOT1␊
227␊
228long UFSGetDirEntry( CICell ih, char * dirPath, long long * dirIndex,␊
229 char ** name, long * flags, long * time,␊
230 FinderInfo * finderInfo, long * infoValid)␊
231{␊
232 long ret, fileInodeNum, dirFlags;␊
233 Inode tmpInode;␊
234␊
235 if (UFSInitPartition(ih) == -1) return -1;␊
236␊
237 if (infoValid) *infoValid = 0;␊
238␊
239 // Skip a leading '/' if present␊
240 if (*dirPath == '/') dirPath++;␊
241 if (*dirPath == '/') dirPath++;␊
242␊
243 ret = ResolvePathToInode(dirPath, &dirFlags, gFileInodePtr, gRootInodePtr);␊
244 if ((ret == -1) || ((dirFlags & kFileTypeMask) != kFileTypeDirectory))␊
245 return -1;␊
246␊
247 ret = ReadDirEntry(gFileInodePtr, &fileInodeNum, dirIndex, name);␊
248 if (ret != 0) return ret;␊
249␊
250 ReadInode(fileInodeNum, &tmpInode, flags, time);␊
251␊
252 return 0;␊
253}␊
254␊
255void␊
256UFSGetDescription(CICell ih, char *str, long strMaxLen)␊
257{␊
258 if (UFSInitPartition(ih) == -1) { return; }␊
259␊
260 struct ufslabel *ul;␊
261␊
262 // Look for the Disk Label␊
263 Seek(ih, 1ULL * UFS_LABEL_OFFSET);␊
264 Read(ih, (long)gULBuf, UFS_LABEL_SIZE);␊
265 ␊
266 ul = (struct ufslabel *)gULBuf;␊
267 ␊
268 unsigned char magic_bytes[] = UFS_LABEL_MAGIC;␊
269 int i;␊
270 unsigned char *p = (unsigned char *)&ul->ul_magic;␊
271 ␊
272 for (i=0; i<sizeof(magic_bytes); i++, p++) {␊
273 if (*p != magic_bytes[i])␊
274 return;␊
275 }␊
276 strncpy(str, (const char *)ul->ul_name, strMaxLen);␊
277}␊
278␊
279long␊
280UFSGetFileBlock(CICell ih, char *filePath, unsigned long long *firstBlock)␊
281{␊
282 long ret, flags;␊
283␊
284 if (UFSInitPartition(ih) == -1) return -1;␊
285␊
286 // Skip one or two leading '/'.␊
287 if (*filePath == '/') filePath++;␊
288 if (*filePath == '/') filePath++;␊
289␊
290 ret = ResolvePathToInode(filePath, &flags, gFileInodePtr, gRootInodePtr);␊
291 if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) return -1;␊
292␊
293 *firstBlock = (gPartitionBase + 1ULL * gFileInodePtr->di_db[0] * gBlockSize) / 512ULL;␊
294␊
295 return 0;␊
296}␊
297␊
298␊
299#endif /* !BOOT1 */␊
300␊
301// Private functions␊
302␊
303static char * ReadBlock( long fragNum, long blockOffset, long length,␊
304 char * buffer, long cache )␊
305{␊
306 long long offset;␊
307 long blockNum;␊
308␊
309 blockNum = fragNum / gFragsPerBlock;␊
310 fragNum -= blockNum * gFragsPerBlock;␊
311 ␊
312 blockOffset += fragNum * gFragSize;␊
313 ␊
314 offset = gPartitionBase + 1ULL * blockNum * gBlockSize;␊
315␊
316 if (cache && ((blockOffset + length) <= gBlockSize)) {␊
317 CacheRead(gCurrentIH, gTempBlock, offset, gBlockSize, 1);␊
318 if (buffer != 0) bcopy(gTempBlock + blockOffset, buffer, length);␊
319 else buffer = gTempBlock + blockOffset;␊
320 } else {␊
321 offset += blockOffset;␊
322 CacheRead(gCurrentIH, buffer, offset, length, 0);␊
323 }␊
324␊
325 return buffer;␊
326}␊
327␊
328static long ReadInode( long inodeNum, InodePtr inode, long * flags, long * time )␊
329{␊
330 long fragNum = ino_to_fsba(gFS, inodeNum);␊
331 long blockOffset = ino_to_fsbo(gFS, inodeNum) * sizeof(Inode);␊
332␊
333 ReadBlock(fragNum, blockOffset, sizeof(Inode), (char *)inode, 1);␊
334 byte_swap_dinode_in(inode);␊
335␊
336 if (time != 0) *time = inode->di_mtime;␊
337␊
338 if (flags != 0) {␊
339 switch (inode->di_mode & IFMT) {␊
340 case IFREG: *flags = kFileTypeFlat; break;␊
341 case IFDIR: *flags = kFileTypeDirectory; break;␊
342 case IFLNK: *flags = kFileTypeLink; break;␊
343 default : *flags = kFileTypeUnknown; break;␊
344 }␊
345␊
346 *flags |= inode->di_mode & kPermMask;␊
347␊
348 if (inode->di_uid != 0) *flags |= kOwnerNotRoot;␊
349 }␊
350␊
351 return 0;␊
352}␊
353␊
354static long ResolvePathToInode( char * filePath, long * flags,␊
355 InodePtr fileInode, InodePtr dirInode )␊
356{␊
357 char * restPath;␊
358 long ret, cnt;␊
359␊
360 // if filePath is empty the we want this directory.␊
361 if (*filePath == '\0') {␊
362 bcopy((char *)dirInode, (char *)fileInode, sizeof(Inode));␊
363 return 0;␊
364 }␊
365␊
366 // Copy the file name to gTempName␊
367 cnt = 0;␊
368 while ((filePath[cnt] != '/') && (filePath[cnt] != '\0')) cnt++;␊
369 strlcpy(gTempName, filePath, cnt+1);␊
370␊
371 // Move restPath to the right place.␊
372 if (filePath[cnt] != '\0') cnt++;␊
373 restPath = filePath + cnt;␊
374␊
375 // gTempName is a name in the current Dir.␊
376 // restPath is the rest of the path if any.␊
377␊
378 ret = FindFileInDir(gTempName, flags, fileInode, dirInode);␊
379 if (ret == -1) return -1;␊
380␊
381 if ((*restPath != '\0') && ((*flags & kFileTypeMask) == kFileTypeDirectory))␊
382 ret = ResolvePathToInode(restPath, flags, fileInode, fileInode);␊
383␊
384 return ret;␊
385}␊
386␊
387static long ReadDirEntry( InodePtr dirInode, long * fileInodeNum,␊
388 long long * dirIndex, char ** name )␊
389{␊
390 struct direct *dir;␊
391 char *buffer;␊
392 long long index;␊
393 long dirBlockNum, dirBlockOffset;␊
394␊
395 while (1) {␊
396 index = *dirIndex;␊
397 ␊
398 dirBlockOffset = (long) (index % DIRBLKSIZ);␊
399 dirBlockNum = (long) (index / DIRBLKSIZ);␊
400␊
401 buffer = ReadFileBlock(dirInode, dirBlockNum, 0, DIRBLKSIZ, 0, 1);␊
402 if (buffer == 0) return -1;␊
403␊
404 dir = (struct direct *)(buffer + dirBlockOffset);␊
405 byte_swap_dir_block_in((char *)dir, 1);␊
406␊
407 *dirIndex += dir->d_reclen;␊
408 ␊
409 if (dir->d_ino != 0) break;␊
410 ␊
411 if (dirBlockOffset != 0) return -1;␊
412 }␊
413␊
414 *fileInodeNum = dir->d_ino;␊
415 *name = strlcpy(gTempName2, dir->d_name, dir->d_namlen+1);␊
416␊
417 return 0;␊
418}␊
419␊
420static long FindFileInDir( char * fileName, long * flags,␊
421 InodePtr fileInode, InodePtr dirInode )␊
422{␊
423 long ret, inodeNum;␊
424 long long index = 0;␊
425 char *name;␊
426␊
427 while (1) {␊
428 ret = ReadDirEntry(dirInode, &inodeNum, &index, &name);␊
429 if (ret == -1) return -1;␊
430␊
431 if (strcmp(fileName, name) == 0) break;␊
432 }␊
433␊
434 ReadInode(inodeNum, fileInode, flags, 0);␊
435␊
436 return 0;␊
437}␊
438␊
439static char * ReadFileBlock( InodePtr fileInode, long fragNum, long blockOffset,␊
440 long length, char * buffer, long cache )␊
441{␊
442 long fragCount, blockNum;␊
443 long diskFragNum, indFragNum, indBlockOff, refsPerBlock;␊
444 char *indBlock;␊
445␊
446 fragCount = (fileInode->di_size + gFragSize - 1) / gFragSize;␊
447 if (fragNum >= fragCount) return 0;␊
448␊
449 refsPerBlock = gBlockSize / sizeof(ufs_daddr_t);␊
450␊
451 blockNum = fragNum / gFragsPerBlock;␊
452 fragNum -= blockNum * gFragsPerBlock;␊
453 ␊
454 // Get Direct Block Number.␊
455 if (blockNum < NDADDR) {␊
456 diskFragNum = fileInode->di_db[blockNum];␊
457 } else {␊
458 blockNum -= NDADDR;␊
459␊
460 // Get Single Indirect Fragment Number.␊
461 if (blockNum < refsPerBlock) {␊
462 indFragNum = fileInode->di_ib[0];␊
463 } else {␊
464 blockNum -= refsPerBlock;␊
465␊
466 // Get Double Indirect Fragment Number.␊
467 if (blockNum < (refsPerBlock * refsPerBlock)) {␊
468 indFragNum = fileInode->di_ib[1];␊
469 } else {␊
470 blockNum -= refsPerBlock * refsPerBlock;␊
471␊
472 // Get Triple Indirect Fragment Number.␊
473 indFragNum = fileInode->di_ib[2];␊
474␊
475 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
476 indBlockOff = blockNum / (refsPerBlock * refsPerBlock);␊
477 blockNum %= (refsPerBlock * refsPerBlock);␊
478 indFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[indBlockOff]);␊
479 }␊
480␊
481 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
482 indBlockOff = blockNum / refsPerBlock;␊
483 blockNum %= refsPerBlock;␊
484 indFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[indBlockOff]);␊
485 }␊
486␊
487 indBlock = ReadBlock(indFragNum, 0, gBlockSize, 0, 1);␊
488 diskFragNum = SWAP_BE32(((ufs_daddr_t *)indBlock)[blockNum]);␊
489 }␊
490␊
491 buffer = ReadBlock(diskFragNum+fragNum, blockOffset, length, buffer, cache);␊
492␊
493 return buffer;␊
494}␊
495␊
496static long ReadFile( InodePtr fileInode, uint64_t * length, void * base, uint64_t offset )␊
497{␊
498 long bytesLeft, curSize, curFrag;␊
499 char *buffer, *curAddr = (char *)base;␊
500␊
501 bytesLeft = fileInode->di_size;␊
502␊
503 if (offset > bytesLeft) {␊
504 printf("Offset is too large.\n");␊
505 return -1;␊
506 }␊
507␊
508 if ((*length == 0) || ((offset + *length) > bytesLeft)) {␊
509 *length = bytesLeft - offset;␊
510 }␊
511/*␊
512 if (bytesLeft > kLoadSize) {␊
513 printf("File is too large.\n");␊
514 return -1;␊
515 }␊
516*/␊
517 bytesLeft = *length;␊
518 curFrag = (offset / gBlockSize) * gFragsPerBlock;␊
519 offset %= gBlockSize;␊
520␊
521 while (bytesLeft) {␊
522 curSize = gBlockSize;␊
523 if (curSize > bytesLeft) curSize = bytesLeft;␊
524 if ((offset + curSize) > gBlockSize) curSize = (gBlockSize - offset);␊
525␊
526 buffer = ReadFileBlock(fileInode, curFrag, offset, curSize, curAddr, 0);␊
527 if (buffer == 0) break;␊
528␊
529 if (offset != 0) offset = 0;␊
530␊
531 curFrag += gFragsPerBlock;␊
532 curAddr += curSize;␊
533 bytesLeft -= curSize;␊
534 }␊
535␊
536 return bytesLeft;␊
537}

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