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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/hpfs/map.c
1 // SPDX-License-Identifier: GPL-2.0
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
7 * mapping structures to memory with some minimal checks
12 __le32
*hpfs_map_dnode_bitmap(struct super_block
*s
, struct quad_buffer_head
*qbh
)
14 return hpfs_map_4sectors(s
, hpfs_sb(s
)->sb_dmap
, qbh
, 0);
17 __le32
*hpfs_map_bitmap(struct super_block
*s
, unsigned bmp_block
,
18 struct quad_buffer_head
*qbh
, char *id
)
22 unsigned n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
23 if (hpfs_sb(s
)->sb_chk
) if (bmp_block
>= n_bands
) {
24 hpfs_error(s
, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block
, id
);
27 sec
= le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[bmp_block
]);
28 if (!sec
|| sec
> hpfs_sb(s
)->sb_fs_size
-4) {
29 hpfs_error(s
, "invalid bitmap block pointer %08x -> %08x at %s", bmp_block
, sec
, id
);
32 ret
= hpfs_map_4sectors(s
, sec
, qbh
, 4);
33 if (ret
) hpfs_prefetch_bitmap(s
, bmp_block
+ 1);
37 void hpfs_prefetch_bitmap(struct super_block
*s
, unsigned bmp_block
)
39 unsigned to_prefetch
, next_prefetch
;
40 unsigned n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
41 if (unlikely(bmp_block
>= n_bands
))
43 to_prefetch
= le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[bmp_block
]);
44 if (unlikely(bmp_block
+ 1 >= n_bands
))
47 next_prefetch
= le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[bmp_block
+ 1]);
48 hpfs_prefetch_sectors(s
, to_prefetch
, 4 + 4 * (to_prefetch
+ 4 == next_prefetch
));
52 * Load first code page into kernel memory, return pointer to 256-byte array,
53 * first 128 bytes are uppercasing table for chars 128-255, next 128 bytes are
57 unsigned char *hpfs_load_code_page(struct super_block
*s
, secno cps
)
59 struct buffer_head
*bh
;
63 unsigned char *cp_table
;
65 struct code_page_data
*cpd
;
66 struct code_page_directory
*cp
= hpfs_map_sector(s
, cps
, &bh
, 0);
68 if (le32_to_cpu(cp
->magic
) != CP_DIR_MAGIC
) {
69 pr_err("Code page directory magic doesn't match (magic = %08x)\n",
70 le32_to_cpu(cp
->magic
));
74 if (!le32_to_cpu(cp
->n_code_pages
)) {
75 pr_err("n_code_pages == 0\n");
79 cpds
= le32_to_cpu(cp
->array
[0].code_page_data
);
80 cpi
= le16_to_cpu(cp
->array
[0].index
);
84 pr_err("Code page index out of array\n");
88 if (!(cpd
= hpfs_map_sector(s
, cpds
, &bh
, 0))) return NULL
;
89 if (le16_to_cpu(cpd
->offs
[cpi
]) > 0x178) {
90 pr_err("Code page index out of sector\n");
94 ptr
= (unsigned char *)cpd
+ le16_to_cpu(cpd
->offs
[cpi
]) + 6;
95 if (!(cp_table
= kmalloc(256, GFP_KERNEL
))) {
96 pr_err("out of memory for code page table\n");
100 memcpy(cp_table
, ptr
, 128);
103 /* Try to build lowercasing table from uppercasing one */
105 for (i
=128; i
<256; i
++) cp_table
[i
]=i
;
106 for (i
=128; i
<256; i
++) if (cp_table
[i
-128]!=i
&& cp_table
[i
-128]>=128)
107 cp_table
[cp_table
[i
-128]] = i
;
112 __le32
*hpfs_load_bitmap_directory(struct super_block
*s
, secno bmp
)
114 struct buffer_head
*bh
;
115 int n
= (hpfs_sb(s
)->sb_fs_size
+ 0x200000 - 1) >> 21;
118 if (!(b
= kmalloc_array(n
, 512, GFP_KERNEL
))) {
119 pr_err("can't allocate memory for bitmap directory\n");
123 __le32
*d
= hpfs_map_sector(s
, bmp
+i
, &bh
, n
- i
- 1);
128 memcpy((char *)b
+ 512 * i
, d
, 512);
134 void hpfs_load_hotfix_map(struct super_block
*s
, struct hpfs_spare_block
*spareblock
)
136 struct quad_buffer_head qbh
;
138 u32 n_hotfixes
, n_used_hotfixes
;
141 n_hotfixes
= le32_to_cpu(spareblock
->n_spares
);
142 n_used_hotfixes
= le32_to_cpu(spareblock
->n_spares_used
);
144 if (n_hotfixes
> 256 || n_used_hotfixes
> n_hotfixes
) {
145 hpfs_error(s
, "invalid number of hotfixes: %u, used: %u", n_hotfixes
, n_used_hotfixes
);
148 if (!(directory
= hpfs_map_4sectors(s
, le32_to_cpu(spareblock
->hotfix_map
), &qbh
, 0))) {
149 hpfs_error(s
, "can't load hotfix map");
152 for (i
= 0; i
< n_used_hotfixes
; i
++) {
153 hpfs_sb(s
)->hotfix_from
[i
] = le32_to_cpu(directory
[i
]);
154 hpfs_sb(s
)->hotfix_to
[i
] = le32_to_cpu(directory
[n_hotfixes
+ i
]);
156 hpfs_sb(s
)->n_hotfixes
= n_used_hotfixes
;
161 * Load fnode to memory
164 struct fnode
*hpfs_map_fnode(struct super_block
*s
, ino_t ino
, struct buffer_head
**bhp
)
167 if (hpfs_sb(s
)->sb_chk
) if (hpfs_chk_sectors(s
, ino
, 1, "fnode")) {
170 if ((fnode
= hpfs_map_sector(s
, ino
, bhp
, FNODE_RD_AHEAD
))) {
171 if (hpfs_sb(s
)->sb_chk
) {
172 struct extended_attribute
*ea
;
173 struct extended_attribute
*ea_end
;
174 if (le32_to_cpu(fnode
->magic
) != FNODE_MAGIC
) {
175 hpfs_error(s
, "bad magic on fnode %08lx",
179 if (!fnode_is_dir(fnode
)) {
180 if ((unsigned)fnode
->btree
.n_used_nodes
+ (unsigned)fnode
->btree
.n_free_nodes
!=
181 (bp_internal(&fnode
->btree
) ? 12 : 8)) {
183 "bad number of nodes in fnode %08lx",
187 if (le16_to_cpu(fnode
->btree
.first_free
) !=
188 8 + fnode
->btree
.n_used_nodes
* (bp_internal(&fnode
->btree
) ? 8 : 12)) {
190 "bad first_free pointer in fnode %08lx",
195 if (le16_to_cpu(fnode
->ea_size_s
) && (le16_to_cpu(fnode
->ea_offs
) < 0xc4 ||
196 le16_to_cpu(fnode
->ea_offs
) + le16_to_cpu(fnode
->acl_size_s
) + le16_to_cpu(fnode
->ea_size_s
) > 0x200)) {
198 "bad EA info in fnode %08lx: ea_offs == %04x ea_size_s == %04x",
200 le16_to_cpu(fnode
->ea_offs
), le16_to_cpu(fnode
->ea_size_s
));
203 ea
= fnode_ea(fnode
);
204 ea_end
= fnode_end_ea(fnode
);
205 while (ea
!= ea_end
) {
207 hpfs_error(s
, "bad EA in fnode %08lx",
221 struct anode
*hpfs_map_anode(struct super_block
*s
, anode_secno ano
, struct buffer_head
**bhp
)
224 if (hpfs_sb(s
)->sb_chk
) if (hpfs_chk_sectors(s
, ano
, 1, "anode")) return NULL
;
225 if ((anode
= hpfs_map_sector(s
, ano
, bhp
, ANODE_RD_AHEAD
)))
226 if (hpfs_sb(s
)->sb_chk
) {
227 if (le32_to_cpu(anode
->magic
) != ANODE_MAGIC
) {
228 hpfs_error(s
, "bad magic on anode %08x", ano
);
231 if (le32_to_cpu(anode
->self
) != ano
) {
232 hpfs_error(s
, "self pointer invalid on anode %08x", ano
);
235 if ((unsigned)anode
->btree
.n_used_nodes
+ (unsigned)anode
->btree
.n_free_nodes
!=
236 (bp_internal(&anode
->btree
) ? 60 : 40)) {
237 hpfs_error(s
, "bad number of nodes in anode %08x", ano
);
240 if (le16_to_cpu(anode
->btree
.first_free
) !=
241 8 + anode
->btree
.n_used_nodes
* (bp_internal(&anode
->btree
) ? 8 : 12)) {
242 hpfs_error(s
, "bad first_free pointer in anode %08x", ano
);
253 * Load dnode to memory and do some checks
256 struct dnode
*hpfs_map_dnode(struct super_block
*s
, unsigned secno
,
257 struct quad_buffer_head
*qbh
)
260 if (hpfs_sb(s
)->sb_chk
) {
261 if (hpfs_chk_sectors(s
, secno
, 4, "dnode")) return NULL
;
263 hpfs_error(s
, "dnode %08x not byte-aligned", secno
);
267 if ((dnode
= hpfs_map_4sectors(s
, secno
, qbh
, DNODE_RD_AHEAD
)))
268 if (hpfs_sb(s
)->sb_chk
) {
270 unsigned char *d
= (unsigned char *)dnode
;
272 if (le32_to_cpu(dnode
->magic
) != DNODE_MAGIC
) {
273 hpfs_error(s
, "bad magic on dnode %08x", secno
);
276 if (le32_to_cpu(dnode
->self
) != secno
)
277 hpfs_error(s
, "bad self pointer on dnode %08x self = %08x", secno
, le32_to_cpu(dnode
->self
));
278 /* Check dirents - bad dirents would cause infinite
279 loops or shooting to memory */
280 if (le32_to_cpu(dnode
->first_free
) > 2048) {
281 hpfs_error(s
, "dnode %08x has first_free == %08x", secno
, le32_to_cpu(dnode
->first_free
));
284 for (p
= 20; p
< le32_to_cpu(dnode
->first_free
); p
+= d
[p
] + (d
[p
+1] << 8)) {
285 struct hpfs_dirent
*de
= (struct hpfs_dirent
*)((char *)dnode
+ p
);
286 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) {
287 hpfs_error(s
, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno
, p
, pp
);
290 if (((31 + de
->namelen
+ de
->down
*4 + 3) & ~3) != le16_to_cpu(de
->length
)) {
291 if (((31 + de
->namelen
+ de
->down
*4 + 3) & ~3) < le16_to_cpu(de
->length
) && s
->s_flags
& SB_RDONLY
) goto ok
;
292 hpfs_error(s
, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno
, p
, pp
);
296 if (hpfs_sb(s
)->sb_chk
>= 2) b
|= 1 << de
->down
;
297 if (de
->down
) if (de_down_pointer(de
) < 0x10) {
298 hpfs_error(s
, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno
, p
, pp
);
304 if (p
!= le32_to_cpu(dnode
->first_free
)) {
305 hpfs_error(s
, "size on last dirent does not match first_free; dnode %08x", secno
);
308 if (d
[pp
+ 30] != 1 || d
[pp
+ 31] != 255) {
309 hpfs_error(s
, "dnode %08x does not end with \\377 entry", secno
);
313 pr_err("unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n",
322 dnode_secno
hpfs_fnode_dno(struct super_block
*s
, ino_t ino
)
324 struct buffer_head
*bh
;
328 fnode
= hpfs_map_fnode(s
, ino
, &bh
);
332 dno
= le32_to_cpu(fnode
->u
.external
[0].disk_secno
);