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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [hpfs/] [map.c] - Blame information for rev 1765

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/*
 *  linux/fs/hpfs/map.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  mapping structures to memory with some minimal checks
 */
 
#include "hpfs_fn.h"
 
unsigned *hpfs_map_dnode_bitmap(struct super_block *s, struct quad_buffer_head *qbh)
{
        return hpfs_map_4sectors(s, s->s_hpfs_dmap, qbh, 0);
}
 
unsigned int *hpfs_map_bitmap(struct super_block *s, unsigned bmp_block,
                         struct quad_buffer_head *qbh, char *id)
{
        secno sec;
        if (s->s_hpfs_chk) if (bmp_block * 16384 > s->s_hpfs_fs_size) {
                hpfs_error(s, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block, id);
                return NULL;
        }
        sec = s->s_hpfs_bmp_dir[bmp_block];
        if (!sec || sec > s->s_hpfs_fs_size-4) {
                hpfs_error(s, "invalid bitmap block pointer %08x -> %08x at %s", bmp_block, sec, id);
                return NULL;
        }
        return hpfs_map_4sectors(s, sec, qbh, 4);
}
 
/*
 * Load first code page into kernel memory, return pointer to 256-byte array,
 * first 128 bytes are uppercasing table for chars 128-255, next 128 bytes are
 * lowercasing table
 */
 
char *hpfs_load_code_page(struct super_block *s, secno cps)
{
        struct buffer_head *bh;
        secno cpds;
        unsigned cpi;
        unsigned char *ptr;
        unsigned char *cp_table;
        int i;
        struct code_page_data *cpd;
        struct code_page_directory *cp = hpfs_map_sector(s, cps, &bh, 0);
        if (!cp) return NULL;
        if (cp->magic != CP_DIR_MAGIC) {
                printk("HPFS: Code page directory magic doesn't match (magic = %08x)\n", cp->magic);
                brelse(bh);
                return NULL;
        }
        if (!cp->n_code_pages) {
                printk("HPFS: n_code_pages == 0\n");
                brelse(bh);
                return NULL;
        }
        cpds = cp->array[0].code_page_data;
        cpi = cp->array[0].index;
        brelse(bh);
 
        if (cpi >= 3) {
                printk("HPFS: Code page index out of array\n");
                return NULL;
        }
 
        if (!(cpd = hpfs_map_sector(s, cpds, &bh, 0))) return NULL;
        if ((unsigned)cpd->offs[cpi] > 0x178) {
                printk("HPFS: Code page index out of sector\n");
                brelse(bh);
                return NULL;
        }
        ptr = (char *)cpd + cpd->offs[cpi] + 6;
        if (!(cp_table = kmalloc(256, GFP_KERNEL))) {
                printk("HPFS: out of memory for code page table\n");
                brelse(bh);
                return NULL;
        }
        memcpy(cp_table, ptr, 128);
        brelse(bh);
 
        /* Try to build lowercasing table from uppercasing one */
 
        for (i=128; i<256; i++) cp_table[i]=i;
        for (i=128; i<256; i++) if (cp_table[i-128]!=i && cp_table[i-128]>=128)
                cp_table[cp_table[i-128]] = i;
 
        return cp_table;
}
 
secno *hpfs_load_bitmap_directory(struct super_block *s, secno bmp)
{
        struct buffer_head *bh;
        int n = (s->s_hpfs_fs_size + 0x200000 - 1) >> 21;
        int i;
        secno *b;
        if (!(b = kmalloc(n * 512, GFP_KERNEL))) {
                printk("HPFS: can't allocate memory for bitmap directory\n");
                return NULL;
        }
        for (i=0;i<n;i++) {
                secno *d = hpfs_map_sector(s, bmp+i, &bh, n - i - 1);
                if (!d) {
                        kfree(b);
                        return NULL;
                }
                memcpy((char *)b + 512 * i, d, 512);
                brelse(bh);
        }
        return b;
}
 
/*
 * Load fnode to memory
 */
 
struct fnode *hpfs_map_fnode(struct super_block *s, ino_t ino, struct buffer_head **bhp)
{
        struct fnode *fnode;
        if (s->s_hpfs_chk) if (hpfs_chk_sectors(s, ino, 1, "fnode")) {
                return NULL;
        }
        if ((fnode = hpfs_map_sector(s, ino, bhp, FNODE_RD_AHEAD))) {
                if (s->s_hpfs_chk) {
                        struct extended_attribute *ea;
                        struct extended_attribute *ea_end;
                        if (fnode->magic != FNODE_MAGIC) {
                                hpfs_error(s, "bad magic on fnode %08x", ino);
                                goto bail;
                        }
                        if (!fnode->dirflag) {
                                if ((unsigned)fnode->btree.n_used_nodes + (unsigned)fnode->btree.n_free_nodes !=
                                    (fnode->btree.internal ? 12 : 8)) {
                                        hpfs_error(s, "bad number of nodes in fnode %08x", ino);
                                        goto bail;
                                }
                                if (fnode->btree.first_free !=
                                    8 + fnode->btree.n_used_nodes * (fnode->btree.internal ? 8 : 12)) {
                                        hpfs_error(s, "bad first_free pointer in fnode %08x", ino);
                                        goto bail;
                                }
                        }
                        if (fnode->ea_size_s && ((signed int)fnode->ea_offs < 0xc4 ||
                           (signed int)fnode->ea_offs + fnode->ea_size_s > 0x200)) {
                                hpfs_error(s, "bad EA info in fnode %08x: ea_offs == %04x ea_size_s == %04x",
                                        ino, fnode->ea_offs, fnode->ea_size_s);
                                goto bail;
                        }
                        ea = fnode_ea(fnode);
                        ea_end = fnode_end_ea(fnode);
                        while (ea != ea_end) {
                                if (ea > ea_end) {
                                        hpfs_error(s, "bad EA in fnode %08x", ino);
                                        goto bail;
                                }
                                ea = next_ea(ea);
                        }
                }
        }
        return fnode;
        bail:
        brelse(*bhp);
        return NULL;
}
 
struct anode *hpfs_map_anode(struct super_block *s, anode_secno ano, struct buffer_head **bhp)
{
        struct anode *anode;
        if (s->s_hpfs_chk) if (hpfs_chk_sectors(s, ano, 1, "anode")) return NULL;
        if ((anode = hpfs_map_sector(s, ano, bhp, ANODE_RD_AHEAD)))
                if (s->s_hpfs_chk) {
                        if (anode->magic != ANODE_MAGIC || anode->self != ano) {
                                hpfs_error(s, "bad magic on anode %08x", ano);
                                goto bail;
                        }
                        if ((unsigned)anode->btree.n_used_nodes + (unsigned)anode->btree.n_free_nodes !=
                            (anode->btree.internal ? 60 : 40)) {
                                hpfs_error(s, "bad number of nodes in anode %08x", ano);
                                goto bail;
                        }
                        if (anode->btree.first_free !=
                            8 + anode->btree.n_used_nodes * (anode->btree.internal ? 8 : 12)) {
                                hpfs_error(s, "bad first_free pointer in anode %08x", ano);
                                goto bail;
                        }
                }
        return anode;
        bail:
        brelse(*bhp);
        return NULL;
}
 
/*
 * Load dnode to memory and do some checks
 */
 
struct dnode *hpfs_map_dnode(struct super_block *s, unsigned secno,
                             struct quad_buffer_head *qbh)
{
        struct dnode *dnode;
        if (s->s_hpfs_chk) {
                if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;
                if (secno & 3) {
                        hpfs_error(s, "dnode %08x not byte-aligned", secno);
                        return NULL;
                }
        }
        if ((dnode = hpfs_map_4sectors(s, secno, qbh, DNODE_RD_AHEAD)))
                if (s->s_hpfs_chk) {
                        unsigned p, pp = 0;
                        unsigned char *d = (char *)dnode;
                        int b = 0;
                        if (dnode->magic != DNODE_MAGIC) {
                                hpfs_error(s, "bad magic on dnode %08x", secno);
                                goto bail;
                        }
                        if (dnode->self != secno)
                                hpfs_error(s, "bad self pointer on dnode %08x self = %08x", secno, dnode->self);
                        /* Check dirents - bad dirents would cause infinite
                           loops or shooting to memory */
                        if (dnode->first_free > 2048/* || dnode->first_free < 84*/) {
                                hpfs_error(s, "dnode %08x has first_free == %08x", secno, dnode->first_free);
                                goto bail;
                        }
                        for (p = 20; p < dnode->first_free; p += d[p] + (d[p+1] << 8)) {
                                struct hpfs_dirent *de = (struct hpfs_dirent *)((char *)dnode + p);
                                if (de->length > 292 || (de->length < 32) || (de->length & 3)) {
                                        hpfs_error(s, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
                                        goto bail;
                                }
                                if (((31 + de->namelen + de->down*4 + 3) & ~3) != de->length) {
                                        hpfs_error(s, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
                                        goto bail;
                                }
                                if (s->s_hpfs_chk >= 2) b |= 1 << de->down;
                                if (de->down) if (de_down_pointer(de) < 0x10) {
                                        hpfs_error(s, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno, p, pp);
                                        goto bail;
                                }
                                pp = p;
 
                        }
                        if (p != dnode->first_free) {
                                hpfs_error(s, "size on last dirent does not match first_free; dnode %08x", secno);
                                goto bail;
                        }
                        if (d[pp + 30] != 1 || d[pp + 31] != 255) {
                                hpfs_error(s, "dnode %08x does not end with \\377 entry", secno);
                                goto bail;
                        }
                        if (b == 3) printk("HPFS: warning: unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n", secno);
                }
        return dnode;
        bail:
        hpfs_brelse4(qbh);
        return NULL;
}
 
dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino)
{
        struct buffer_head *bh;
        struct fnode *fnode;
        dnode_secno dno;
 
        fnode = hpfs_map_fnode(s, ino, &bh);
        if (!fnode)
                return 0;
 
        dno = fnode->u.external[0].disk_secno;
        brelse(bh);
        return dno;
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [hpfs/] [map.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
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
11			`unsigned hpfs_map_dnode_bitmap(struct super_block s, struct quad_buffer_head *qbh)`
12			`{`
13			`return hpfs_map_4sectors(s, s->s_hpfs_dmap, qbh, 0);`
14			`}`
15
16			`unsigned int hpfs_map_bitmap(struct super_block s, unsigned bmp_block,`
17			`struct quad_buffer_head qbh, char id)`
18			`{`
19			`secno sec;`
20			`if (s->s_hpfs_chk) if (bmp_block * 16384 > s->s_hpfs_fs_size) {`
21			`hpfs_error(s, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block, id);`
22			`return NULL;`
23			`}`
24			`sec = s->s_hpfs_bmp_dir[bmp_block];`
25			`if (!sec \|\| sec > s->s_hpfs_fs_size-4) {`
26			`hpfs_error(s, "invalid bitmap block pointer %08x -> %08x at %s", bmp_block, sec, id);`
27			`return NULL;`
28			`}`
29			`return hpfs_map_4sectors(s, sec, qbh, 4);`
30			`}`
31
32			`/*`
33			`* Load first code page into kernel memory, return pointer to 256-byte array,`
34			`* first 128 bytes are uppercasing table for chars 128-255, next 128 bytes are`
35			`* lowercasing table`
36			`*/`
37
38			`char hpfs_load_code_page(struct super_block s, secno cps)`
39			`{`
40			`struct buffer_head *bh;`
41			`secno cpds;`
42			`unsigned cpi;`
43			`unsigned char *ptr;`
44			`unsigned char *cp_table;`
45			`int i;`
46			`struct code_page_data *cpd;`
47			`struct code_page_directory *cp = hpfs_map_sector(s, cps, &bh, 0);`
48			`if (!cp) return NULL;`
49			`if (cp->magic != CP_DIR_MAGIC) {`
50			`printk("HPFS: Code page directory magic doesn't match (magic = %08x)\n", cp->magic);`
51			`brelse(bh);`
52			`return NULL;`
53			`}`
54			`if (!cp->n_code_pages) {`
55			`printk("HPFS: n_code_pages == 0\n");`
56			`brelse(bh);`
57			`return NULL;`
58			`}`
59			`cpds = cp->array[0].code_page_data;`
60			`cpi = cp->array[0].index;`
61			`brelse(bh);`
62
63			`if (cpi >= 3) {`
64			`printk("HPFS: Code page index out of array\n");`
65			`return NULL;`
66			`}`
67
68			`if (!(cpd = hpfs_map_sector(s, cpds, &bh, 0))) return NULL;`
69			`if ((unsigned)cpd->offs[cpi] > 0x178) {`
70			`printk("HPFS: Code page index out of sector\n");`
71			`brelse(bh);`
72			`return NULL;`
73			`}`
74			`ptr = (char *)cpd + cpd->offs[cpi] + 6;`
75			`if (!(cp_table = kmalloc(256, GFP_KERNEL))) {`
76			`printk("HPFS: out of memory for code page table\n");`
77			`brelse(bh);`
78			`return NULL;`
79			`}`
80			`memcpy(cp_table, ptr, 128);`
81			`brelse(bh);`
82
83			`/* Try to build lowercasing table from uppercasing one */`
84
85			`for (i=128; i<256; i++) cp_table[i]=i;`
86			`for (i=128; i<256; i++) if (cp_table[i-128]!=i && cp_table[i-128]>=128)`
87			`cp_table[cp_table[i-128]] = i;`
88
89			`return cp_table;`
90			`}`
91
92			`secno hpfs_load_bitmap_directory(struct super_block s, secno bmp)`
93			`{`
94			`struct buffer_head *bh;`
95			`int n = (s->s_hpfs_fs_size + 0x200000 - 1) >> 21;`
96			`int i;`
97			`secno *b;`
98			`if (!(b = kmalloc(n * 512, GFP_KERNEL))) {`
99			`printk("HPFS: can't allocate memory for bitmap directory\n");`
100			`return NULL;`
101			`}`
102			`for (i=0;i<n;i++) {`
103			`secno *d = hpfs_map_sector(s, bmp+i, &bh, n - i - 1);`
104			`if (!d) {`
105			`kfree(b);`
106			`return NULL;`
107			`}`
108			`memcpy((char )b + 512 i, d, 512);`
109			`brelse(bh);`
110			`}`
111			`return b;`
112			`}`
113
114			`/*`
115			`* Load fnode to memory`
116			`*/`
117
118			`struct fnode hpfs_map_fnode(struct super_block s, ino_t ino, struct buffer_head **bhp)`
119			`{`
120			`struct fnode *fnode;`
121			`if (s->s_hpfs_chk) if (hpfs_chk_sectors(s, ino, 1, "fnode")) {`
122			`return NULL;`
123			`}`
124			`if ((fnode = hpfs_map_sector(s, ino, bhp, FNODE_RD_AHEAD))) {`
125			`if (s->s_hpfs_chk) {`
126			`struct extended_attribute *ea;`
127			`struct extended_attribute *ea_end;`
128			`if (fnode->magic != FNODE_MAGIC) {`
129			`hpfs_error(s, "bad magic on fnode %08x", ino);`
130			`goto bail;`
131			`}`
132			`if (!fnode->dirflag) {`
133			`if ((unsigned)fnode->btree.n_used_nodes + (unsigned)fnode->btree.n_free_nodes !=`
134			`(fnode->btree.internal ? 12 : 8)) {`
135			`hpfs_error(s, "bad number of nodes in fnode %08x", ino);`
136			`goto bail;`
137			`}`
138			`if (fnode->btree.first_free !=`
139			`8 + fnode->btree.n_used_nodes * (fnode->btree.internal ? 8 : 12)) {`
140			`hpfs_error(s, "bad first_free pointer in fnode %08x", ino);`
141			`goto bail;`
142			`}`
143			`}`
144			`if (fnode->ea_size_s && ((signed int)fnode->ea_offs < 0xc4 \|\|`
145			`(signed int)fnode->ea_offs + fnode->ea_size_s > 0x200)) {`
146			`hpfs_error(s, "bad EA info in fnode %08x: ea_offs == %04x ea_size_s == %04x",`
147			`ino, fnode->ea_offs, fnode->ea_size_s);`
148			`goto bail;`
149			`}`
150			`ea = fnode_ea(fnode);`
151			`ea_end = fnode_end_ea(fnode);`
152			`while (ea != ea_end) {`
153			`if (ea > ea_end) {`
154			`hpfs_error(s, "bad EA in fnode %08x", ino);`
155			`goto bail;`
156			`}`
157			`ea = next_ea(ea);`
158			`}`
159			`}`
160			`}`
161			`return fnode;`
162			`bail:`
163			`brelse(*bhp);`
164			`return NULL;`
165			`}`
166
167			`struct anode hpfs_map_anode(struct super_block s, anode_secno ano, struct buffer_head **bhp)`
168			`{`
169			`struct anode *anode;`
170			`if (s->s_hpfs_chk) if (hpfs_chk_sectors(s, ano, 1, "anode")) return NULL;`
171			`if ((anode = hpfs_map_sector(s, ano, bhp, ANODE_RD_AHEAD)))`
172			`if (s->s_hpfs_chk) {`
173			`if (anode->magic != ANODE_MAGIC \|\| anode->self != ano) {`
174			`hpfs_error(s, "bad magic on anode %08x", ano);`
175			`goto bail;`
176			`}`
177			`if ((unsigned)anode->btree.n_used_nodes + (unsigned)anode->btree.n_free_nodes !=`
178			`(anode->btree.internal ? 60 : 40)) {`
179			`hpfs_error(s, "bad number of nodes in anode %08x", ano);`
180			`goto bail;`
181			`}`
182			`if (anode->btree.first_free !=`
183			`8 + anode->btree.n_used_nodes * (anode->btree.internal ? 8 : 12)) {`
184			`hpfs_error(s, "bad first_free pointer in anode %08x", ano);`
185			`goto bail;`
186			`}`
187			`}`
188			`return anode;`
189			`bail:`
190			`brelse(*bhp);`
191			`return NULL;`
192			`}`
193
194			`/*`
195			`* Load dnode to memory and do some checks`
196			`*/`
197
198			`struct dnode hpfs_map_dnode(struct super_block s, unsigned secno,`
199			`struct quad_buffer_head *qbh)`
200			`{`
201			`struct dnode *dnode;`
202			`if (s->s_hpfs_chk) {`
203			`if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;`
204			`if (secno & 3) {`
205			`hpfs_error(s, "dnode %08x not byte-aligned", secno);`
206			`return NULL;`
207			`}`
208			`}`
209			`if ((dnode = hpfs_map_4sectors(s, secno, qbh, DNODE_RD_AHEAD)))`
210			`if (s->s_hpfs_chk) {`
211			`unsigned p, pp = 0;`
212			`unsigned char d = (char )dnode;`
213			`int b = 0;`
214			`if (dnode->magic != DNODE_MAGIC) {`
215			`hpfs_error(s, "bad magic on dnode %08x", secno);`
216			`goto bail;`
217			`}`
218			`if (dnode->self != secno)`
219			`hpfs_error(s, "bad self pointer on dnode %08x self = %08x", secno, dnode->self);`
220			`/* Check dirents - bad dirents would cause infinite`
221			`loops or shooting to memory */`
222			`if (dnode->first_free > 2048/* \|\| dnode->first_free < 84*/) {`
223			`hpfs_error(s, "dnode %08x has first_free == %08x", secno, dnode->first_free);`
224			`goto bail;`
225			`}`
226			`for (p = 20; p < dnode->first_free; p += d[p] + (d[p+1] << 8)) {`
227			`struct hpfs_dirent de = (struct hpfs_dirent )((char *)dnode + p);`
228			`if (de->length > 292 \|\| (de->length < 32) \|\| (de->length & 3)) {`
229			`hpfs_error(s, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);`
230			`goto bail;`
231			`}`
232			`if (((31 + de->namelen + de->down*4 + 3) & ~3) != de->length) {`
233			`hpfs_error(s, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);`
234			`goto bail;`
235			`}`
236			`if (s->s_hpfs_chk >= 2) b \|= 1 << de->down;`
237			`if (de->down) if (de_down_pointer(de) < 0x10) {`
238			`hpfs_error(s, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno, p, pp);`
239			`goto bail;`
240			`}`
241			`pp = p;`
242
243			`}`
244			`if (p != dnode->first_free) {`
245			`hpfs_error(s, "size on last dirent does not match first_free; dnode %08x", secno);`
246			`goto bail;`
247			`}`
248			`if (d[pp + 30] != 1 \|\| d[pp + 31] != 255) {`
249			`hpfs_error(s, "dnode %08x does not end with \\377 entry", secno);`
250			`goto bail;`
251			`}`
252			`if (b == 3) printk("HPFS: warning: unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n", secno);`
253			`}`
254			`return dnode;`
255			`bail:`
256			`hpfs_brelse4(qbh);`
257			`return NULL;`
258			`}`
259
260			`dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino)`
261			`{`
262			`struct buffer_head *bh;`
263			`struct fnode *fnode;`
264			`dnode_secno dno;`
265
266			`fnode = hpfs_map_fnode(s, ino, &bh);`
267			`if (!fnode)`
268			`return 0;`
269
270			`dno = fnode->u.external[0].disk_secno;`
271			`brelse(bh);`
272			`return dno;`
273			`}`