1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright (c) 1999 by Sun Microsystems, Inc.
24*0Sstevel@tonic-gate * All rights reserved.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate /*
30*0Sstevel@tonic-gate * fsck_pcfs -- routines for manipulating the FAT.
31*0Sstevel@tonic-gate */
32*0Sstevel@tonic-gate #include <stdio.h>
33*0Sstevel@tonic-gate #include <unistd.h>
34*0Sstevel@tonic-gate #include <stdlib.h>
35*0Sstevel@tonic-gate #include <libintl.h>
36*0Sstevel@tonic-gate #include <sys/dktp/fdisk.h>
37*0Sstevel@tonic-gate #include <sys/fs/pc_fs.h>
38*0Sstevel@tonic-gate #include <sys/fs/pc_dir.h>
39*0Sstevel@tonic-gate #include <sys/fs/pc_label.h>
40*0Sstevel@tonic-gate #include "pcfs_common.h"
41*0Sstevel@tonic-gate #include "fsck_pcfs.h"
42*0Sstevel@tonic-gate
43*0Sstevel@tonic-gate extern int32_t BytesPerCluster;
44*0Sstevel@tonic-gate extern int32_t TotalClusters;
45*0Sstevel@tonic-gate extern int32_t LastCluster;
46*0Sstevel@tonic-gate extern off64_t FirstClusterOffset;
47*0Sstevel@tonic-gate extern off64_t PartitionOffset;
48*0Sstevel@tonic-gate extern bpb_t TheBIOSParameterBlock;
49*0Sstevel@tonic-gate extern int ReadOnly;
50*0Sstevel@tonic-gate extern int IsFAT32;
51*0Sstevel@tonic-gate extern int Verbose;
52*0Sstevel@tonic-gate
53*0Sstevel@tonic-gate static uchar_t *TheFAT;
54*0Sstevel@tonic-gate static int FATRewriteNeeded = 0;
55*0Sstevel@tonic-gate
56*0Sstevel@tonic-gate int32_t FATSize;
57*0Sstevel@tonic-gate short FATEntrySize;
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate static off64_t
seekFAT(int fd)60*0Sstevel@tonic-gate seekFAT(int fd)
61*0Sstevel@tonic-gate {
62*0Sstevel@tonic-gate off64_t seekto;
63*0Sstevel@tonic-gate /*
64*0Sstevel@tonic-gate * The FAT(s) immediately follows the reserved sectors.
65*0Sstevel@tonic-gate */
66*0Sstevel@tonic-gate seekto = TheBIOSParameterBlock.bpb.resv_sectors *
67*0Sstevel@tonic-gate TheBIOSParameterBlock.bpb.bytes_per_sector + PartitionOffset;
68*0Sstevel@tonic-gate return (lseek64(fd, seekto, SEEK_SET));
69*0Sstevel@tonic-gate }
70*0Sstevel@tonic-gate
71*0Sstevel@tonic-gate void
getFAT(int fd)72*0Sstevel@tonic-gate getFAT(int fd)
73*0Sstevel@tonic-gate {
74*0Sstevel@tonic-gate ssize_t bytesRead;
75*0Sstevel@tonic-gate
76*0Sstevel@tonic-gate if (TheFAT != NULL) {
77*0Sstevel@tonic-gate return;
78*0Sstevel@tonic-gate } else if ((TheFAT = (uchar_t *)malloc(FATSize)) == NULL) {
79*0Sstevel@tonic-gate mountSanityCheckFails();
80*0Sstevel@tonic-gate perror(gettext("No memory for a copy of the FAT"));
81*0Sstevel@tonic-gate (void) close(fd);
82*0Sstevel@tonic-gate exit(7);
83*0Sstevel@tonic-gate }
84*0Sstevel@tonic-gate if (seekFAT(fd) < 0) {
85*0Sstevel@tonic-gate mountSanityCheckFails();
86*0Sstevel@tonic-gate perror(gettext("Cannot seek to FAT"));
87*0Sstevel@tonic-gate (void) close(fd);
88*0Sstevel@tonic-gate exit(7);
89*0Sstevel@tonic-gate }
90*0Sstevel@tonic-gate if (Verbose)
91*0Sstevel@tonic-gate (void) fprintf(stderr,
92*0Sstevel@tonic-gate gettext("Reading FAT\n"));
93*0Sstevel@tonic-gate if ((bytesRead = read(fd, TheFAT, FATSize)) != FATSize) {
94*0Sstevel@tonic-gate mountSanityCheckFails();
95*0Sstevel@tonic-gate if (bytesRead < 0) {
96*0Sstevel@tonic-gate perror(gettext("Cannot read a FAT"));
97*0Sstevel@tonic-gate } else {
98*0Sstevel@tonic-gate (void) fprintf(stderr,
99*0Sstevel@tonic-gate gettext("Short read of FAT."));
100*0Sstevel@tonic-gate }
101*0Sstevel@tonic-gate (void) close(fd);
102*0Sstevel@tonic-gate exit(7);
103*0Sstevel@tonic-gate }
104*0Sstevel@tonic-gate /*
105*0Sstevel@tonic-gate * XXX - might want to read the other copies of the FAT
106*0Sstevel@tonic-gate * for comparison and/or to use if the first one seems hosed.
107*0Sstevel@tonic-gate */
108*0Sstevel@tonic-gate if (Verbose) {
109*0Sstevel@tonic-gate (void) fprintf(stderr,
110*0Sstevel@tonic-gate gettext("Dump of FAT's first 32 bytes.\n"));
111*0Sstevel@tonic-gate header_for_dump();
112*0Sstevel@tonic-gate dump_bytes(TheFAT, 32);
113*0Sstevel@tonic-gate }
114*0Sstevel@tonic-gate }
115*0Sstevel@tonic-gate
116*0Sstevel@tonic-gate void
writeFATMods(int fd)117*0Sstevel@tonic-gate writeFATMods(int fd)
118*0Sstevel@tonic-gate {
119*0Sstevel@tonic-gate ssize_t bytesWritten;
120*0Sstevel@tonic-gate
121*0Sstevel@tonic-gate if (TheFAT == NULL) {
122*0Sstevel@tonic-gate (void) fprintf(stderr,
123*0Sstevel@tonic-gate gettext("Internal error: No FAT to write\n"));
124*0Sstevel@tonic-gate (void) close(fd);
125*0Sstevel@tonic-gate exit(11);
126*0Sstevel@tonic-gate }
127*0Sstevel@tonic-gate if (!FATRewriteNeeded) {
128*0Sstevel@tonic-gate if (Verbose) {
129*0Sstevel@tonic-gate (void) fprintf(stderr,
130*0Sstevel@tonic-gate gettext("No FAT changes need to be written.\n"));
131*0Sstevel@tonic-gate }
132*0Sstevel@tonic-gate return;
133*0Sstevel@tonic-gate }
134*0Sstevel@tonic-gate if (ReadOnly)
135*0Sstevel@tonic-gate return;
136*0Sstevel@tonic-gate if (Verbose)
137*0Sstevel@tonic-gate (void) fprintf(stderr, gettext("Writing FAT\n"));
138*0Sstevel@tonic-gate if (seekFAT(fd) < 0) {
139*0Sstevel@tonic-gate perror(gettext("Cannot seek to FAT"));
140*0Sstevel@tonic-gate (void) close(fd);
141*0Sstevel@tonic-gate exit(11);
142*0Sstevel@tonic-gate }
143*0Sstevel@tonic-gate if ((bytesWritten = write(fd, TheFAT, FATSize)) != FATSize) {
144*0Sstevel@tonic-gate if (bytesWritten < 0) {
145*0Sstevel@tonic-gate perror(gettext("Cannot write FAT"));
146*0Sstevel@tonic-gate } else {
147*0Sstevel@tonic-gate (void) fprintf(stderr,
148*0Sstevel@tonic-gate gettext("Short write of FAT."));
149*0Sstevel@tonic-gate }
150*0Sstevel@tonic-gate (void) close(fd);
151*0Sstevel@tonic-gate exit(11);
152*0Sstevel@tonic-gate }
153*0Sstevel@tonic-gate FATRewriteNeeded = 0;
154*0Sstevel@tonic-gate }
155*0Sstevel@tonic-gate
156*0Sstevel@tonic-gate /*
157*0Sstevel@tonic-gate * checkFAT32CleanBit()
158*0Sstevel@tonic-gate * Return non-zero if the bit indicating proper Windows shutdown has
159*0Sstevel@tonic-gate * been set.
160*0Sstevel@tonic-gate */
161*0Sstevel@tonic-gate int
checkFAT32CleanBit(int fd)162*0Sstevel@tonic-gate checkFAT32CleanBit(int fd)
163*0Sstevel@tonic-gate {
164*0Sstevel@tonic-gate getFAT(fd);
165*0Sstevel@tonic-gate return (TheFAT[WIN_SHUTDOWN_STATUS_BYTE] & WIN_SHUTDOWN_BIT_MASK);
166*0Sstevel@tonic-gate }
167*0Sstevel@tonic-gate
168*0Sstevel@tonic-gate static uchar_t *
findClusterEntryInFAT(int32_t currentCluster)169*0Sstevel@tonic-gate findClusterEntryInFAT(int32_t currentCluster)
170*0Sstevel@tonic-gate {
171*0Sstevel@tonic-gate int32_t idx;
172*0Sstevel@tonic-gate if (FATEntrySize == 32) {
173*0Sstevel@tonic-gate idx = currentCluster * 4;
174*0Sstevel@tonic-gate } else if (FATEntrySize == 16) {
175*0Sstevel@tonic-gate idx = currentCluster * 2;
176*0Sstevel@tonic-gate } else {
177*0Sstevel@tonic-gate idx = currentCluster + currentCluster/2;
178*0Sstevel@tonic-gate }
179*0Sstevel@tonic-gate return (TheFAT + idx);
180*0Sstevel@tonic-gate }
181*0Sstevel@tonic-gate
182*0Sstevel@tonic-gate /*
183*0Sstevel@tonic-gate * {read,write}FATentry
184*0Sstevel@tonic-gate * For the 16 and 32 bit FATs these routines are relatively easy
185*0Sstevel@tonic-gate * to follow.
186*0Sstevel@tonic-gate *
187*0Sstevel@tonic-gate * 12 bit FATs are kind of strange, though. The magic index for
188*0Sstevel@tonic-gate * 12 bit FATS computed below, 1.5 * clusterNum, is a
189*0Sstevel@tonic-gate * simplification that there are 8 bits in a byte, so you need
190*0Sstevel@tonic-gate * 1.5 bytes per entry.
191*0Sstevel@tonic-gate *
192*0Sstevel@tonic-gate * It's easiest to think about FAT12 entries in pairs:
193*0Sstevel@tonic-gate *
194*0Sstevel@tonic-gate * ---------------------------------------------
195*0Sstevel@tonic-gate * | mid1 | low1 | low2 | high1 | high2 | mid2 |
196*0Sstevel@tonic-gate * ---------------------------------------------
197*0Sstevel@tonic-gate *
198*0Sstevel@tonic-gate * Each box in the diagram represents a nibble (4 bits) of a FAT
199*0Sstevel@tonic-gate * entry. A FAT entry is made up of three nibbles. So if you
200*0Sstevel@tonic-gate * look closely, you'll see that first byte of the pair of
201*0Sstevel@tonic-gate * entries contains the low and middle nibbles of the first
202*0Sstevel@tonic-gate * entry. The second byte has the low nibble of the second entry
203*0Sstevel@tonic-gate * and the high nibble of the first entry. Those two bytes alone
204*0Sstevel@tonic-gate * are enough to read the first entry. The second FAT entry is
205*0Sstevel@tonic-gate * finished out by the last nibble pair.
206*0Sstevel@tonic-gate */
207*0Sstevel@tonic-gate int32_t
readFATEntry(int32_t currentCluster)208*0Sstevel@tonic-gate readFATEntry(int32_t currentCluster)
209*0Sstevel@tonic-gate {
210*0Sstevel@tonic-gate int32_t value;
211*0Sstevel@tonic-gate uchar_t *ep;
212*0Sstevel@tonic-gate
213*0Sstevel@tonic-gate ep = findClusterEntryInFAT(currentCluster);
214*0Sstevel@tonic-gate if (FATEntrySize == 32) {
215*0Sstevel@tonic-gate read_32_bits(ep, (uint32_t *)&value);
216*0Sstevel@tonic-gate } else if (FATEntrySize == 16) {
217*0Sstevel@tonic-gate read_16_bits(ep, (uint32_t *)&value);
218*0Sstevel@tonic-gate /*
219*0Sstevel@tonic-gate * Convert 16 bit entry to 32 bit if we are
220*0Sstevel@tonic-gate * into the reserved or higher values.
221*0Sstevel@tonic-gate */
222*0Sstevel@tonic-gate if (value >= PCF_RESCLUSTER)
223*0Sstevel@tonic-gate value |= 0xFFF0000;
224*0Sstevel@tonic-gate } else {
225*0Sstevel@tonic-gate value = 0;
226*0Sstevel@tonic-gate if (currentCluster & 1) {
227*0Sstevel@tonic-gate /*
228*0Sstevel@tonic-gate * Odd numbered cluster
229*0Sstevel@tonic-gate */
230*0Sstevel@tonic-gate value = (((unsigned int)*ep++ & 0xf0) >> 4);
231*0Sstevel@tonic-gate value += (*ep << 4);
232*0Sstevel@tonic-gate } else {
233*0Sstevel@tonic-gate value = *ep++;
234*0Sstevel@tonic-gate value += ((*ep & 0x0f) << 8);
235*0Sstevel@tonic-gate }
236*0Sstevel@tonic-gate /*
237*0Sstevel@tonic-gate * Convert 12 bit entry to 32 bit if we are
238*0Sstevel@tonic-gate * into the reserved or higher values.
239*0Sstevel@tonic-gate */
240*0Sstevel@tonic-gate if (value >= PCF_12BCLUSTER)
241*0Sstevel@tonic-gate value |= 0xFFFF000;
242*0Sstevel@tonic-gate }
243*0Sstevel@tonic-gate return (value);
244*0Sstevel@tonic-gate }
245*0Sstevel@tonic-gate
246*0Sstevel@tonic-gate void
writeFATEntry(int32_t currentCluster,int32_t value)247*0Sstevel@tonic-gate writeFATEntry(int32_t currentCluster, int32_t value)
248*0Sstevel@tonic-gate {
249*0Sstevel@tonic-gate uchar_t *ep;
250*0Sstevel@tonic-gate
251*0Sstevel@tonic-gate FATRewriteNeeded = 1;
252*0Sstevel@tonic-gate ep = findClusterEntryInFAT(currentCluster);
253*0Sstevel@tonic-gate if (FATEntrySize == 32) {
254*0Sstevel@tonic-gate store_32_bits(&ep, value);
255*0Sstevel@tonic-gate } else if (FATEntrySize == 16) {
256*0Sstevel@tonic-gate store_16_bits(&ep, value);
257*0Sstevel@tonic-gate } else {
258*0Sstevel@tonic-gate if (currentCluster & 1) {
259*0Sstevel@tonic-gate /*
260*0Sstevel@tonic-gate * Odd numbered cluster
261*0Sstevel@tonic-gate */
262*0Sstevel@tonic-gate *ep = (*ep & 0x0f) | ((value << 4) & 0xf0);
263*0Sstevel@tonic-gate ep++;
264*0Sstevel@tonic-gate *ep = (value >> 4) & 0xff;
265*0Sstevel@tonic-gate } else {
266*0Sstevel@tonic-gate *ep++ = value & 0xff;
267*0Sstevel@tonic-gate *ep = (*ep & 0xf0) | ((value >> 8) & 0x0f);
268*0Sstevel@tonic-gate }
269*0Sstevel@tonic-gate }
270*0Sstevel@tonic-gate }
271*0Sstevel@tonic-gate
272*0Sstevel@tonic-gate /*
273*0Sstevel@tonic-gate * reservedInFAT - Is this cluster marked in the reserved range?
274*0Sstevel@tonic-gate * The range from PCF_RESCLUSTER32 to PCF_BADCLUSTER32 - 1,
275*0Sstevel@tonic-gate * have been reserved by Microsoft. No cluster should be
276*0Sstevel@tonic-gate * marked with these; they are effectively invalid cluster values.
277*0Sstevel@tonic-gate */
278*0Sstevel@tonic-gate int
reservedInFAT(int32_t clusterNum)279*0Sstevel@tonic-gate reservedInFAT(int32_t clusterNum)
280*0Sstevel@tonic-gate {
281*0Sstevel@tonic-gate int32_t e;
282*0Sstevel@tonic-gate
283*0Sstevel@tonic-gate e = readFATEntry(clusterNum);
284*0Sstevel@tonic-gate return (e >= PCF_RESCLUSTER32 && e < PCF_BADCLUSTER32);
285*0Sstevel@tonic-gate }
286*0Sstevel@tonic-gate
287*0Sstevel@tonic-gate /*
288*0Sstevel@tonic-gate * badInFAT - Is this cluster marked as bad? I.e., is it inaccessible?
289*0Sstevel@tonic-gate */
290*0Sstevel@tonic-gate int
badInFAT(int32_t clusterNum)291*0Sstevel@tonic-gate badInFAT(int32_t clusterNum)
292*0Sstevel@tonic-gate {
293*0Sstevel@tonic-gate return (readFATEntry(clusterNum) == PCF_BADCLUSTER32);
294*0Sstevel@tonic-gate }
295*0Sstevel@tonic-gate
296*0Sstevel@tonic-gate /*
297*0Sstevel@tonic-gate * lastInFAT - Is this cluster marked as free? I.e., is it available
298*0Sstevel@tonic-gate * for use?
299*0Sstevel@tonic-gate */
300*0Sstevel@tonic-gate int
freeInFAT(int32_t clusterNum)301*0Sstevel@tonic-gate freeInFAT(int32_t clusterNum)
302*0Sstevel@tonic-gate {
303*0Sstevel@tonic-gate return (readFATEntry(clusterNum) == PCF_FREECLUSTER);
304*0Sstevel@tonic-gate }
305*0Sstevel@tonic-gate
306*0Sstevel@tonic-gate /*
307*0Sstevel@tonic-gate * lastInFAT - Is this cluster the last in its cluster chain?
308*0Sstevel@tonic-gate */
309*0Sstevel@tonic-gate int
lastInFAT(int32_t clusterNum)310*0Sstevel@tonic-gate lastInFAT(int32_t clusterNum)
311*0Sstevel@tonic-gate {
312*0Sstevel@tonic-gate return (readFATEntry(clusterNum) == PCF_LASTCLUSTER32);
313*0Sstevel@tonic-gate }
314*0Sstevel@tonic-gate
315*0Sstevel@tonic-gate /*
316*0Sstevel@tonic-gate * markLastInFAT - Mark this cluster as the last in its cluster chain.
317*0Sstevel@tonic-gate */
318*0Sstevel@tonic-gate void
markLastInFAT(int32_t clusterNum)319*0Sstevel@tonic-gate markLastInFAT(int32_t clusterNum)
320*0Sstevel@tonic-gate {
321*0Sstevel@tonic-gate writeFATEntry(clusterNum, PCF_LASTCLUSTER32);
322*0Sstevel@tonic-gate }
323*0Sstevel@tonic-gate
324*0Sstevel@tonic-gate void
markFreeInFAT(int32_t clusterNum)325*0Sstevel@tonic-gate markFreeInFAT(int32_t clusterNum)
326*0Sstevel@tonic-gate {
327*0Sstevel@tonic-gate writeFATEntry(clusterNum, PCF_FREECLUSTER);
328*0Sstevel@tonic-gate }
329*0Sstevel@tonic-gate
330*0Sstevel@tonic-gate void
markBadInFAT(int32_t clusterNum)331*0Sstevel@tonic-gate markBadInFAT(int32_t clusterNum)
332*0Sstevel@tonic-gate {
333*0Sstevel@tonic-gate writeFATEntry(clusterNum, PCF_BADCLUSTER32);
334*0Sstevel@tonic-gate }
335