blob: 3aa66ae1031e7f8b8c0ea8399b670daa308d3557 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/hpfs/map.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * mapping structures to memory with some minimal checks
7 */
8
9#include "hpfs_fn.h"
10
Al Viro52576da2012-04-17 15:28:51 -040011__le32 *hpfs_map_dnode_bitmap(struct super_block *s, struct quad_buffer_head *qbh)
Linus Torvalds1da177e2005-04-16 15:20:36 -070012{
13 return hpfs_map_4sectors(s, hpfs_sb(s)->sb_dmap, qbh, 0);
14}
15
Al Viro52576da2012-04-17 15:28:51 -040016__le32 *hpfs_map_bitmap(struct super_block *s, unsigned bmp_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 struct quad_buffer_head *qbh, char *id)
18{
19 secno sec;
Mikulas Patocka275f4952013-07-04 19:04:01 +020020 __le32 *ret;
Mikulas Patocka3ebacb02013-07-04 18:42:29 +020021 unsigned n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
22 if (hpfs_sb(s)->sb_chk) if (bmp_block >= n_bands) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 hpfs_error(s, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block, id);
24 return NULL;
25 }
Mikulas Patocka0b697602011-05-08 20:44:26 +020026 sec = le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[bmp_block]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 if (!sec || sec > hpfs_sb(s)->sb_fs_size-4) {
28 hpfs_error(s, "invalid bitmap block pointer %08x -> %08x at %s", bmp_block, sec, id);
29 return NULL;
30 }
Mikulas Patocka275f4952013-07-04 19:04:01 +020031 ret = hpfs_map_4sectors(s, sec, qbh, 4);
32 if (ret) hpfs_prefetch_bitmap(s, bmp_block + 1);
33 return ret;
34}
35
36void hpfs_prefetch_bitmap(struct super_block *s, unsigned bmp_block)
37{
38 unsigned to_prefetch, next_prefetch;
39 unsigned n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
40 if (unlikely(bmp_block >= n_bands))
41 return;
42 to_prefetch = le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[bmp_block]);
43 if (unlikely(bmp_block + 1 >= n_bands))
44 next_prefetch = 0;
45 else
46 next_prefetch = le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[bmp_block + 1]);
47 hpfs_prefetch_sectors(s, to_prefetch, 4 + 4 * (to_prefetch + 4 == next_prefetch));
Linus Torvalds1da177e2005-04-16 15:20:36 -070048}
49
50/*
51 * Load first code page into kernel memory, return pointer to 256-byte array,
52 * first 128 bytes are uppercasing table for chars 128-255, next 128 bytes are
53 * lowercasing table
54 */
55
Al Viro7e7742e2010-01-31 17:09:29 -050056unsigned char *hpfs_load_code_page(struct super_block *s, secno cps)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
58 struct buffer_head *bh;
59 secno cpds;
60 unsigned cpi;
61 unsigned char *ptr;
62 unsigned char *cp_table;
63 int i;
64 struct code_page_data *cpd;
65 struct code_page_directory *cp = hpfs_map_sector(s, cps, &bh, 0);
66 if (!cp) return NULL;
Mikulas Patocka0b697602011-05-08 20:44:26 +020067 if (le32_to_cpu(cp->magic) != CP_DIR_MAGIC) {
68 printk("HPFS: Code page directory magic doesn't match (magic = %08x)\n", le32_to_cpu(cp->magic));
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 brelse(bh);
70 return NULL;
71 }
Mikulas Patocka0b697602011-05-08 20:44:26 +020072 if (!le32_to_cpu(cp->n_code_pages)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 printk("HPFS: n_code_pages == 0\n");
74 brelse(bh);
75 return NULL;
76 }
Mikulas Patocka0b697602011-05-08 20:44:26 +020077 cpds = le32_to_cpu(cp->array[0].code_page_data);
78 cpi = le16_to_cpu(cp->array[0].index);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 brelse(bh);
80
81 if (cpi >= 3) {
82 printk("HPFS: Code page index out of array\n");
83 return NULL;
84 }
85
86 if (!(cpd = hpfs_map_sector(s, cpds, &bh, 0))) return NULL;
Mikulas Patocka0b697602011-05-08 20:44:26 +020087 if (le16_to_cpu(cpd->offs[cpi]) > 0x178) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 printk("HPFS: Code page index out of sector\n");
89 brelse(bh);
90 return NULL;
91 }
Mikulas Patocka0b697602011-05-08 20:44:26 +020092 ptr = (unsigned char *)cpd + le16_to_cpu(cpd->offs[cpi]) + 6;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (!(cp_table = kmalloc(256, GFP_KERNEL))) {
94 printk("HPFS: out of memory for code page table\n");
95 brelse(bh);
96 return NULL;
97 }
98 memcpy(cp_table, ptr, 128);
99 brelse(bh);
100
101 /* Try to build lowercasing table from uppercasing one */
102
103 for (i=128; i<256; i++) cp_table[i]=i;
104 for (i=128; i<256; i++) if (cp_table[i-128]!=i && cp_table[i-128]>=128)
105 cp_table[cp_table[i-128]] = i;
106
107 return cp_table;
108}
109
Al Viro28fe3c12012-04-17 16:41:13 -0400110__le32 *hpfs_load_bitmap_directory(struct super_block *s, secno bmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 struct buffer_head *bh;
113 int n = (hpfs_sb(s)->sb_fs_size + 0x200000 - 1) >> 21;
114 int i;
Al Viro28fe3c12012-04-17 16:41:13 -0400115 __le32 *b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (!(b = kmalloc(n * 512, GFP_KERNEL))) {
117 printk("HPFS: can't allocate memory for bitmap directory\n");
118 return NULL;
119 }
120 for (i=0;i<n;i++) {
Al Viro28fe3c12012-04-17 16:41:13 -0400121 __le32 *d = hpfs_map_sector(s, bmp+i, &bh, n - i - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 if (!d) {
123 kfree(b);
124 return NULL;
125 }
126 memcpy((char *)b + 512 * i, d, 512);
127 brelse(bh);
128 }
129 return b;
130}
131
132/*
133 * Load fnode to memory
134 */
135
136struct fnode *hpfs_map_fnode(struct super_block *s, ino_t ino, struct buffer_head **bhp)
137{
138 struct fnode *fnode;
139 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, ino, 1, "fnode")) {
140 return NULL;
141 }
142 if ((fnode = hpfs_map_sector(s, ino, bhp, FNODE_RD_AHEAD))) {
143 if (hpfs_sb(s)->sb_chk) {
144 struct extended_attribute *ea;
145 struct extended_attribute *ea_end;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200146 if (le32_to_cpu(fnode->magic) != FNODE_MAGIC) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800147 hpfs_error(s, "bad magic on fnode %08lx",
148 (unsigned long)ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 goto bail;
150 }
Al Viroc4c99542012-04-06 14:30:07 -0400151 if (!fnode_is_dir(fnode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 if ((unsigned)fnode->btree.n_used_nodes + (unsigned)fnode->btree.n_free_nodes !=
Al Viroddc19e62012-04-17 15:59:35 -0400153 (bp_internal(&fnode->btree) ? 12 : 8)) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800154 hpfs_error(s,
155 "bad number of nodes in fnode %08lx",
156 (unsigned long)ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 goto bail;
158 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200159 if (le16_to_cpu(fnode->btree.first_free) !=
Al Viroddc19e62012-04-17 15:59:35 -0400160 8 + fnode->btree.n_used_nodes * (bp_internal(&fnode->btree) ? 8 : 12)) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800161 hpfs_error(s,
162 "bad first_free pointer in fnode %08lx",
163 (unsigned long)ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 goto bail;
165 }
166 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200167 if (le16_to_cpu(fnode->ea_size_s) && (le16_to_cpu(fnode->ea_offs) < 0xc4 ||
168 le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200)) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800169 hpfs_error(s,
170 "bad EA info in fnode %08lx: ea_offs == %04x ea_size_s == %04x",
171 (unsigned long)ino,
Mikulas Patocka0b697602011-05-08 20:44:26 +0200172 le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 goto bail;
174 }
175 ea = fnode_ea(fnode);
176 ea_end = fnode_end_ea(fnode);
177 while (ea != ea_end) {
178 if (ea > ea_end) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800179 hpfs_error(s, "bad EA in fnode %08lx",
180 (unsigned long)ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 goto bail;
182 }
183 ea = next_ea(ea);
184 }
185 }
186 }
187 return fnode;
188 bail:
189 brelse(*bhp);
190 return NULL;
191}
192
193struct anode *hpfs_map_anode(struct super_block *s, anode_secno ano, struct buffer_head **bhp)
194{
195 struct anode *anode;
196 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, ano, 1, "anode")) return NULL;
197 if ((anode = hpfs_map_sector(s, ano, bhp, ANODE_RD_AHEAD)))
198 if (hpfs_sb(s)->sb_chk) {
Mikulas Patocka0b697602011-05-08 20:44:26 +0200199 if (le32_to_cpu(anode->magic) != ANODE_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 hpfs_error(s, "bad magic on anode %08x", ano);
201 goto bail;
202 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200203 if (le32_to_cpu(anode->self) != ano) {
204 hpfs_error(s, "self pointer invalid on anode %08x", ano);
205 goto bail;
206 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if ((unsigned)anode->btree.n_used_nodes + (unsigned)anode->btree.n_free_nodes !=
Al Viroddc19e62012-04-17 15:59:35 -0400208 (bp_internal(&anode->btree) ? 60 : 40)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 hpfs_error(s, "bad number of nodes in anode %08x", ano);
210 goto bail;
211 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200212 if (le16_to_cpu(anode->btree.first_free) !=
Al Viroddc19e62012-04-17 15:59:35 -0400213 8 + anode->btree.n_used_nodes * (bp_internal(&anode->btree) ? 8 : 12)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 hpfs_error(s, "bad first_free pointer in anode %08x", ano);
215 goto bail;
216 }
217 }
218 return anode;
219 bail:
220 brelse(*bhp);
221 return NULL;
222}
223
224/*
225 * Load dnode to memory and do some checks
226 */
227
228struct dnode *hpfs_map_dnode(struct super_block *s, unsigned secno,
229 struct quad_buffer_head *qbh)
230{
231 struct dnode *dnode;
232 if (hpfs_sb(s)->sb_chk) {
233 if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;
234 if (secno & 3) {
235 hpfs_error(s, "dnode %08x not byte-aligned", secno);
236 return NULL;
237 }
238 }
239 if ((dnode = hpfs_map_4sectors(s, secno, qbh, DNODE_RD_AHEAD)))
240 if (hpfs_sb(s)->sb_chk) {
241 unsigned p, pp = 0;
Al Viro7e7742e2010-01-31 17:09:29 -0500242 unsigned char *d = (unsigned char *)dnode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 int b = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200244 if (le32_to_cpu(dnode->magic) != DNODE_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 hpfs_error(s, "bad magic on dnode %08x", secno);
246 goto bail;
247 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200248 if (le32_to_cpu(dnode->self) != secno)
249 hpfs_error(s, "bad self pointer on dnode %08x self = %08x", secno, le32_to_cpu(dnode->self));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 /* Check dirents - bad dirents would cause infinite
251 loops or shooting to memory */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200252 if (le32_to_cpu(dnode->first_free) > 2048) {
253 hpfs_error(s, "dnode %08x has first_free == %08x", secno, le32_to_cpu(dnode->first_free));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 goto bail;
255 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200256 for (p = 20; p < le32_to_cpu(dnode->first_free); p += d[p] + (d[p+1] << 8)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct hpfs_dirent *de = (struct hpfs_dirent *)((char *)dnode + p);
Mikulas Patocka0b697602011-05-08 20:44:26 +0200258 if (le16_to_cpu(de->length) > 292 || (le16_to_cpu(de->length) < 32) || (le16_to_cpu(de->length) & 3) || p + le16_to_cpu(de->length) > 2048) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 hpfs_error(s, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
260 goto bail;
261 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200262 if (((31 + de->namelen + de->down*4 + 3) & ~3) != le16_to_cpu(de->length)) {
263 if (((31 + de->namelen + de->down*4 + 3) & ~3) < le16_to_cpu(de->length) && s->s_flags & MS_RDONLY) goto ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 hpfs_error(s, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
265 goto bail;
266 }
267 ok:
268 if (hpfs_sb(s)->sb_chk >= 2) b |= 1 << de->down;
269 if (de->down) if (de_down_pointer(de) < 0x10) {
270 hpfs_error(s, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno, p, pp);
271 goto bail;
272 }
273 pp = p;
274
275 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200276 if (p != le32_to_cpu(dnode->first_free)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 hpfs_error(s, "size on last dirent does not match first_free; dnode %08x", secno);
278 goto bail;
279 }
280 if (d[pp + 30] != 1 || d[pp + 31] != 255) {
281 hpfs_error(s, "dnode %08x does not end with \\377 entry", secno);
282 goto bail;
283 }
284 if (b == 3) printk("HPFS: warning: unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n", secno);
285 }
286 return dnode;
287 bail:
288 hpfs_brelse4(qbh);
289 return NULL;
290}
291
292dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino)
293{
294 struct buffer_head *bh;
295 struct fnode *fnode;
296 dnode_secno dno;
297
298 fnode = hpfs_map_fnode(s, ino, &bh);
299 if (!fnode)
300 return 0;
301
Mikulas Patocka0b697602011-05-08 20:44:26 +0200302 dno = le32_to_cpu(fnode->u.external[0].disk_secno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 brelse(bh);
304 return dno;
305}