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v3.1
  1/*
  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
 11unsigned *hpfs_map_dnode_bitmap(struct super_block *s, struct quad_buffer_head *qbh)
 12{
 13	return hpfs_map_4sectors(s, hpfs_sb(s)->sb_dmap, qbh, 0);
 14}
 15
 16unsigned 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 (hpfs_sb(s)->sb_chk) if (bmp_block * 16384 > hpfs_sb(s)->sb_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 = le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[bmp_block]);
 25	if (!sec || sec > hpfs_sb(s)->sb_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
 38unsigned 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 (le32_to_cpu(cp->magic) != CP_DIR_MAGIC) {
 50		printk("HPFS: Code page directory magic doesn't match (magic = %08x)\n", le32_to_cpu(cp->magic));
 
 51		brelse(bh);
 52		return NULL;
 53	}
 54	if (!le32_to_cpu(cp->n_code_pages)) {
 55		printk("HPFS: n_code_pages == 0\n");
 56		brelse(bh);
 57		return NULL;
 58	}
 59	cpds = le32_to_cpu(cp->array[0].code_page_data);
 60	cpi = le16_to_cpu(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 (le16_to_cpu(cpd->offs[cpi]) > 0x178) {
 70		printk("HPFS: Code page index out of sector\n");
 71		brelse(bh);
 72		return NULL;
 73	}
 74	ptr = (unsigned char *)cpd + le16_to_cpu(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
 92secno *hpfs_load_bitmap_directory(struct super_block *s, secno bmp)
 93{
 94	struct buffer_head *bh;
 95	int n = (hpfs_sb(s)->sb_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
118struct fnode *hpfs_map_fnode(struct super_block *s, ino_t ino, struct buffer_head **bhp)
119{
120	struct fnode *fnode;
121	if (hpfs_sb(s)->sb_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 (hpfs_sb(s)->sb_chk) {
126			struct extended_attribute *ea;
127			struct extended_attribute *ea_end;
128			if (le32_to_cpu(fnode->magic) != FNODE_MAGIC) {
129				hpfs_error(s, "bad magic on fnode %08lx",
130					(unsigned long)ino);
131				goto bail;
132			}
133			if (!fnode->dirflag) {
134				if ((unsigned)fnode->btree.n_used_nodes + (unsigned)fnode->btree.n_free_nodes !=
135				    (fnode->btree.internal ? 12 : 8)) {
136					hpfs_error(s,
137					   "bad number of nodes in fnode %08lx",
138					    (unsigned long)ino);
139					goto bail;
140				}
141				if (le16_to_cpu(fnode->btree.first_free) !=
142				    8 + fnode->btree.n_used_nodes * (fnode->btree.internal ? 8 : 12)) {
143					hpfs_error(s,
144					    "bad first_free pointer in fnode %08lx",
145					    (unsigned long)ino);
146					goto bail;
147				}
148			}
149			if (le16_to_cpu(fnode->ea_size_s) && (le16_to_cpu(fnode->ea_offs) < 0xc4 ||
150			   le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200)) {
151				hpfs_error(s,
152					"bad EA info in fnode %08lx: ea_offs == %04x ea_size_s == %04x",
153					(unsigned long)ino,
154					le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s));
155				goto bail;
156			}
157			ea = fnode_ea(fnode);
158			ea_end = fnode_end_ea(fnode);
159			while (ea != ea_end) {
160				if (ea > ea_end) {
161					hpfs_error(s, "bad EA in fnode %08lx",
162						(unsigned long)ino);
163					goto bail;
164				}
165				ea = next_ea(ea);
166			}
167		}
168	}
169	return fnode;
170	bail:
171	brelse(*bhp);
172	return NULL;
173}
174
175struct anode *hpfs_map_anode(struct super_block *s, anode_secno ano, struct buffer_head **bhp)
176{
177	struct anode *anode;
178	if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, ano, 1, "anode")) return NULL;
179	if ((anode = hpfs_map_sector(s, ano, bhp, ANODE_RD_AHEAD)))
180		if (hpfs_sb(s)->sb_chk) {
181			if (le32_to_cpu(anode->magic) != ANODE_MAGIC) {
182				hpfs_error(s, "bad magic on anode %08x", ano);
183				goto bail;
184			}
185			if (le32_to_cpu(anode->self) != ano) {
186				hpfs_error(s, "self pointer invalid on anode %08x", ano);
187				goto bail;
188			}
189			if ((unsigned)anode->btree.n_used_nodes + (unsigned)anode->btree.n_free_nodes !=
190			    (anode->btree.internal ? 60 : 40)) {
191				hpfs_error(s, "bad number of nodes in anode %08x", ano);
192				goto bail;
193			}
194			if (le16_to_cpu(anode->btree.first_free) !=
195			    8 + anode->btree.n_used_nodes * (anode->btree.internal ? 8 : 12)) {
196				hpfs_error(s, "bad first_free pointer in anode %08x", ano);
197				goto bail;
198			}
199		}
200	return anode;
201	bail:
202	brelse(*bhp);
203	return NULL;
204}
205
206/*
207 * Load dnode to memory and do some checks
208 */
209
210struct dnode *hpfs_map_dnode(struct super_block *s, unsigned secno,
211			     struct quad_buffer_head *qbh)
212{
213	struct dnode *dnode;
214	if (hpfs_sb(s)->sb_chk) {
215		if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;
216		if (secno & 3) {
217			hpfs_error(s, "dnode %08x not byte-aligned", secno);
218			return NULL;
219		}	
220	}
221	if ((dnode = hpfs_map_4sectors(s, secno, qbh, DNODE_RD_AHEAD)))
222		if (hpfs_sb(s)->sb_chk) {
223			unsigned p, pp = 0;
224			unsigned char *d = (unsigned char *)dnode;
225			int b = 0;
226			if (le32_to_cpu(dnode->magic) != DNODE_MAGIC) {
227				hpfs_error(s, "bad magic on dnode %08x", secno);
228				goto bail;
229			}
230			if (le32_to_cpu(dnode->self) != secno)
231				hpfs_error(s, "bad self pointer on dnode %08x self = %08x", secno, le32_to_cpu(dnode->self));
232			/* Check dirents - bad dirents would cause infinite
233			   loops or shooting to memory */
234			if (le32_to_cpu(dnode->first_free) > 2048) {
235				hpfs_error(s, "dnode %08x has first_free == %08x", secno, le32_to_cpu(dnode->first_free));
236				goto bail;
237			}
238			for (p = 20; p < le32_to_cpu(dnode->first_free); p += d[p] + (d[p+1] << 8)) {
239				struct hpfs_dirent *de = (struct hpfs_dirent *)((char *)dnode + p);
240				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) {
241					hpfs_error(s, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
242					goto bail;
243				}
244				if (((31 + de->namelen + de->down*4 + 3) & ~3) != le16_to_cpu(de->length)) {
245					if (((31 + de->namelen + de->down*4 + 3) & ~3) < le16_to_cpu(de->length) && s->s_flags & MS_RDONLY) goto ok;
246					hpfs_error(s, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
247					goto bail;
248				}
249				ok:
250				if (hpfs_sb(s)->sb_chk >= 2) b |= 1 << de->down;
251				if (de->down) if (de_down_pointer(de) < 0x10) {
252					hpfs_error(s, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno, p, pp);
253					goto bail;
254				}
255				pp = p;
256				
257			}
258			if (p != le32_to_cpu(dnode->first_free)) {
259				hpfs_error(s, "size on last dirent does not match first_free; dnode %08x", secno);
260				goto bail;
261			}
262			if (d[pp + 30] != 1 || d[pp + 31] != 255) {
263				hpfs_error(s, "dnode %08x does not end with \\377 entry", secno);
264				goto bail;
265			}
266			if (b == 3) printk("HPFS: warning: unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n", secno);
 
 
267		}
268	return dnode;
269	bail:
270	hpfs_brelse4(qbh);
271	return NULL;
272}
273
274dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino)
275{
276	struct buffer_head *bh;
277	struct fnode *fnode;
278	dnode_secno dno;
279
280	fnode = hpfs_map_fnode(s, ino, &bh);
281	if (!fnode)
282		return 0;
283
284	dno = le32_to_cpu(fnode->u.external[0].disk_secno);
285	brelse(bh);
286	return dno;
287}
v4.10.11
  1/*
  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__le32 *hpfs_map_dnode_bitmap(struct super_block *s, struct quad_buffer_head *qbh)
 12{
 13	return hpfs_map_4sectors(s, hpfs_sb(s)->sb_dmap, qbh, 0);
 14}
 15
 16__le32 *hpfs_map_bitmap(struct super_block *s, unsigned bmp_block,
 17			 struct quad_buffer_head *qbh, char *id)
 18{
 19	secno sec;
 20	__le32 *ret;
 21	unsigned n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 22	if (hpfs_sb(s)->sb_chk) if (bmp_block >= n_bands) {
 23		hpfs_error(s, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block, id);
 24		return NULL;
 25	}
 26	sec = le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[bmp_block]);
 27	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	}
 31	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));
 48}
 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
 56unsigned char *hpfs_load_code_page(struct super_block *s, secno cps)
 57{
 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;
 67	if (le32_to_cpu(cp->magic) != CP_DIR_MAGIC) {
 68		pr_err("Code page directory magic doesn't match (magic = %08x)\n",
 69			le32_to_cpu(cp->magic));
 70		brelse(bh);
 71		return NULL;
 72	}
 73	if (!le32_to_cpu(cp->n_code_pages)) {
 74		pr_err("n_code_pages == 0\n");
 75		brelse(bh);
 76		return NULL;
 77	}
 78	cpds = le32_to_cpu(cp->array[0].code_page_data);
 79	cpi = le16_to_cpu(cp->array[0].index);
 80	brelse(bh);
 81
 82	if (cpi >= 3) {
 83		pr_err("Code page index out of array\n");
 84		return NULL;
 85	}
 86	
 87	if (!(cpd = hpfs_map_sector(s, cpds, &bh, 0))) return NULL;
 88	if (le16_to_cpu(cpd->offs[cpi]) > 0x178) {
 89		pr_err("Code page index out of sector\n");
 90		brelse(bh);
 91		return NULL;
 92	}
 93	ptr = (unsigned char *)cpd + le16_to_cpu(cpd->offs[cpi]) + 6;
 94	if (!(cp_table = kmalloc(256, GFP_KERNEL))) {
 95		pr_err("out of memory for code page table\n");
 96		brelse(bh);
 97		return NULL;
 98	}
 99	memcpy(cp_table, ptr, 128);
100	brelse(bh);
101
102	/* Try to build lowercasing table from uppercasing one */
103
104	for (i=128; i<256; i++) cp_table[i]=i;
105	for (i=128; i<256; i++) if (cp_table[i-128]!=i && cp_table[i-128]>=128)
106		cp_table[cp_table[i-128]] = i;
107	
108	return cp_table;
109}
110
111__le32 *hpfs_load_bitmap_directory(struct super_block *s, secno bmp)
112{
113	struct buffer_head *bh;
114	int n = (hpfs_sb(s)->sb_fs_size + 0x200000 - 1) >> 21;
115	int i;
116	__le32 *b;
117	if (!(b = kmalloc(n * 512, GFP_KERNEL))) {
118		pr_err("can't allocate memory for bitmap directory\n");
119		return NULL;
120	}	
121	for (i=0;i<n;i++) {
122		__le32 *d = hpfs_map_sector(s, bmp+i, &bh, n - i - 1);
123		if (!d) {
124			kfree(b);
125			return NULL;
126		}
127		memcpy((char *)b + 512 * i, d, 512);
128		brelse(bh);
129	}
130	return b;
131}
132
133void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock)
134{
135	struct quad_buffer_head qbh;
136	__le32 *directory;
137	u32 n_hotfixes, n_used_hotfixes;
138	unsigned i;
139
140	n_hotfixes = le32_to_cpu(spareblock->n_spares);
141	n_used_hotfixes = le32_to_cpu(spareblock->n_spares_used);
142
143	if (n_hotfixes > 256 || n_used_hotfixes > n_hotfixes) {
144		hpfs_error(s, "invalid number of hotfixes: %u, used: %u", n_hotfixes, n_used_hotfixes);
145		return;
146	}
147	if (!(directory = hpfs_map_4sectors(s, le32_to_cpu(spareblock->hotfix_map), &qbh, 0))) {
148		hpfs_error(s, "can't load hotfix map");
149		return;
150	}
151	for (i = 0; i < n_used_hotfixes; i++) {
152		hpfs_sb(s)->hotfix_from[i] = le32_to_cpu(directory[i]);
153		hpfs_sb(s)->hotfix_to[i] = le32_to_cpu(directory[n_hotfixes + i]);
154	}
155	hpfs_sb(s)->n_hotfixes = n_used_hotfixes;
156	hpfs_brelse4(&qbh);
157}
158
159/*
160 * Load fnode to memory
161 */
162
163struct fnode *hpfs_map_fnode(struct super_block *s, ino_t ino, struct buffer_head **bhp)
164{
165	struct fnode *fnode;
166	if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, ino, 1, "fnode")) {
167		return NULL;
168	}
169	if ((fnode = hpfs_map_sector(s, ino, bhp, FNODE_RD_AHEAD))) {
170		if (hpfs_sb(s)->sb_chk) {
171			struct extended_attribute *ea;
172			struct extended_attribute *ea_end;
173			if (le32_to_cpu(fnode->magic) != FNODE_MAGIC) {
174				hpfs_error(s, "bad magic on fnode %08lx",
175					(unsigned long)ino);
176				goto bail;
177			}
178			if (!fnode_is_dir(fnode)) {
179				if ((unsigned)fnode->btree.n_used_nodes + (unsigned)fnode->btree.n_free_nodes !=
180				    (bp_internal(&fnode->btree) ? 12 : 8)) {
181					hpfs_error(s,
182					   "bad number of nodes in fnode %08lx",
183					    (unsigned long)ino);
184					goto bail;
185				}
186				if (le16_to_cpu(fnode->btree.first_free) !=
187				    8 + fnode->btree.n_used_nodes * (bp_internal(&fnode->btree) ? 8 : 12)) {
188					hpfs_error(s,
189					    "bad first_free pointer in fnode %08lx",
190					    (unsigned long)ino);
191					goto bail;
192				}
193			}
194			if (le16_to_cpu(fnode->ea_size_s) && (le16_to_cpu(fnode->ea_offs) < 0xc4 ||
195			   le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200)) {
196				hpfs_error(s,
197					"bad EA info in fnode %08lx: ea_offs == %04x ea_size_s == %04x",
198					(unsigned long)ino,
199					le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s));
200				goto bail;
201			}
202			ea = fnode_ea(fnode);
203			ea_end = fnode_end_ea(fnode);
204			while (ea != ea_end) {
205				if (ea > ea_end) {
206					hpfs_error(s, "bad EA in fnode %08lx",
207						(unsigned long)ino);
208					goto bail;
209				}
210				ea = next_ea(ea);
211			}
212		}
213	}
214	return fnode;
215	bail:
216	brelse(*bhp);
217	return NULL;
218}
219
220struct anode *hpfs_map_anode(struct super_block *s, anode_secno ano, struct buffer_head **bhp)
221{
222	struct anode *anode;
223	if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, ano, 1, "anode")) return NULL;
224	if ((anode = hpfs_map_sector(s, ano, bhp, ANODE_RD_AHEAD)))
225		if (hpfs_sb(s)->sb_chk) {
226			if (le32_to_cpu(anode->magic) != ANODE_MAGIC) {
227				hpfs_error(s, "bad magic on anode %08x", ano);
228				goto bail;
229			}
230			if (le32_to_cpu(anode->self) != ano) {
231				hpfs_error(s, "self pointer invalid on anode %08x", ano);
232				goto bail;
233			}
234			if ((unsigned)anode->btree.n_used_nodes + (unsigned)anode->btree.n_free_nodes !=
235			    (bp_internal(&anode->btree) ? 60 : 40)) {
236				hpfs_error(s, "bad number of nodes in anode %08x", ano);
237				goto bail;
238			}
239			if (le16_to_cpu(anode->btree.first_free) !=
240			    8 + anode->btree.n_used_nodes * (bp_internal(&anode->btree) ? 8 : 12)) {
241				hpfs_error(s, "bad first_free pointer in anode %08x", ano);
242				goto bail;
243			}
244		}
245	return anode;
246	bail:
247	brelse(*bhp);
248	return NULL;
249}
250
251/*
252 * Load dnode to memory and do some checks
253 */
254
255struct dnode *hpfs_map_dnode(struct super_block *s, unsigned secno,
256			     struct quad_buffer_head *qbh)
257{
258	struct dnode *dnode;
259	if (hpfs_sb(s)->sb_chk) {
260		if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;
261		if (secno & 3) {
262			hpfs_error(s, "dnode %08x not byte-aligned", secno);
263			return NULL;
264		}	
265	}
266	if ((dnode = hpfs_map_4sectors(s, secno, qbh, DNODE_RD_AHEAD)))
267		if (hpfs_sb(s)->sb_chk) {
268			unsigned p, pp = 0;
269			unsigned char *d = (unsigned char *)dnode;
270			int b = 0;
271			if (le32_to_cpu(dnode->magic) != DNODE_MAGIC) {
272				hpfs_error(s, "bad magic on dnode %08x", secno);
273				goto bail;
274			}
275			if (le32_to_cpu(dnode->self) != secno)
276				hpfs_error(s, "bad self pointer on dnode %08x self = %08x", secno, le32_to_cpu(dnode->self));
277			/* Check dirents - bad dirents would cause infinite
278			   loops or shooting to memory */
279			if (le32_to_cpu(dnode->first_free) > 2048) {
280				hpfs_error(s, "dnode %08x has first_free == %08x", secno, le32_to_cpu(dnode->first_free));
281				goto bail;
282			}
283			for (p = 20; p < le32_to_cpu(dnode->first_free); p += d[p] + (d[p+1] << 8)) {
284				struct hpfs_dirent *de = (struct hpfs_dirent *)((char *)dnode + p);
285				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) {
286					hpfs_error(s, "bad dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
287					goto bail;
288				}
289				if (((31 + de->namelen + de->down*4 + 3) & ~3) != le16_to_cpu(de->length)) {
290					if (((31 + de->namelen + de->down*4 + 3) & ~3) < le16_to_cpu(de->length) && s->s_flags & MS_RDONLY) goto ok;
291					hpfs_error(s, "namelen does not match dirent size in dnode %08x, dirent %03x, last %03x", secno, p, pp);
292					goto bail;
293				}
294				ok:
295				if (hpfs_sb(s)->sb_chk >= 2) b |= 1 << de->down;
296				if (de->down) if (de_down_pointer(de) < 0x10) {
297					hpfs_error(s, "bad down pointer in dnode %08x, dirent %03x, last %03x", secno, p, pp);
298					goto bail;
299				}
300				pp = p;
301				
302			}
303			if (p != le32_to_cpu(dnode->first_free)) {
304				hpfs_error(s, "size on last dirent does not match first_free; dnode %08x", secno);
305				goto bail;
306			}
307			if (d[pp + 30] != 1 || d[pp + 31] != 255) {
308				hpfs_error(s, "dnode %08x does not end with \\377 entry", secno);
309				goto bail;
310			}
311			if (b == 3)
312				pr_err("unbalanced dnode tree, dnode %08x; see hpfs.txt 4 more info\n",
313					secno);
314		}
315	return dnode;
316	bail:
317	hpfs_brelse4(qbh);
318	return NULL;
319}
320
321dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino)
322{
323	struct buffer_head *bh;
324	struct fnode *fnode;
325	dnode_secno dno;
326
327	fnode = hpfs_map_fnode(s, ino, &bh);
328	if (!fnode)
329		return 0;
330
331	dno = le32_to_cpu(fnode->u.external[0].disk_secno);
332	brelse(bh);
333	return dno;
334}