1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 1997-1999 Russell King
7  *  E and F format directory handling
48 	   int _off = idx - (_buf << blocksize_bits);\
49 	  *(u8 *)(bh[_buf]->b_data + _off);	\
54 	   int _off = idx - (_buf << blocksize_bits);\
55 	  *(__le32 *)(bh[_buf]->b_data + _off);	\
60 	   int _off = _idx - (_buf << blocksize_bits);\
61 	  (void *)(_bh[_buf]->b_data + _off);	\
72 	struct buffer_head * const *bh = dir->bh;  in adfs_dir_checkbyte()
73 	const int blocksize_bits = dir->sb->s_blocksize_bits;  in adfs_dir_checkbyte()
76 	int last = 5 - 26;  in adfs_dir_checkbyte()
81 	 * word of the last directory entry.  This  in adfs_dir_checkbyte()
99 		end.ptr8 = ptr.ptr8 + last - i;  in adfs_dir_checkbyte()
107 	 * The directory tail is in the final bh  in adfs_dir_checkbyte()
126 	struct adfs_dirheader *head = dir->dirhead;  in adfs_f_validate()
127 	struct adfs_newdirtail *tail = dir->newtail;  in adfs_f_validate()
129 	if (head->startmasseq != tail->endmasseq ||  in adfs_f_validate()
130 	    tail->dirlastmask || tail->reserved[0] || tail->reserved[1] ||  in adfs_f_validate()
131 	    (memcmp(&head->startname, "Nick", 4) &&  in adfs_f_validate()
132 	     memcmp(&head->startname, "Hugo", 4)) ||  in adfs_f_validate()
133 	    memcmp(&head->startname, &tail->endname, 4) ||  in adfs_f_validate()
134 	    adfs_dir_checkbyte(dir) != tail->dircheckbyte)  in adfs_f_validate()
135 		return -EIO;  in adfs_f_validate()
140 /* Read and check that a directory is valid */
144 	const unsigned int blocksize_bits = sb->s_blocksize_bits;  in adfs_f_read()
148 		return -EIO;  in adfs_f_read()
154 	dir->dirhead = bufoff(dir->bh, 0);  in adfs_f_read()
155 	dir->newtail = bufoff(dir->bh, 2007);  in adfs_f_read()
160 	dir->parent_id = adfs_readval(dir->newtail->dirparent, 3);  in adfs_f_read()
168 	return -EIO;  in adfs_f_read()
172  * convert a disk-based directory entry to a Linux ADFS directory entry
181 		if (de->dirobname[name_len] < ' ')  in adfs_dir2obj()
184 		obj->name[name_len] = de->dirobname[name_len];  in adfs_dir2obj()
187 	obj->name_len =	name_len;  in adfs_dir2obj()
188 	obj->indaddr  = adfs_readval(de->dirinddiscadd, 3);  in adfs_dir2obj()
189 	obj->loadaddr = adfs_readval(de->dirload, 4);  in adfs_dir2obj()
190 	obj->execaddr = adfs_readval(de->direxec, 4);  in adfs_dir2obj()
191 	obj->size     = adfs_readval(de->dirlen,  4);  in adfs_dir2obj()
192 	obj->attr     = de->newdiratts;  in adfs_dir2obj()
198  * convert a Linux ADFS directory entry to a disk-based directory entry
203 	adfs_writeval(de->dirinddiscadd, 3, obj->indaddr);  in adfs_obj2dir()
204 	adfs_writeval(de->dirload, 4, obj->loadaddr);  in adfs_obj2dir()
205 	adfs_writeval(de->direxec, 4, obj->execaddr);  in adfs_obj2dir()
206 	adfs_writeval(de->dirlen,  4, obj->size);  in adfs_obj2dir()
207 	de->newdiratts = obj->attr;  in adfs_obj2dir()
211  * get a directory entry.  Note that the caller is responsible
225 		return -ENOENT;  in __adfs_dir_get()
236 		return -ENOENT;  in adfs_f_setpos()
238 	dir->pos = 5 + fpos * 26;  in adfs_f_setpos()
247 	ret = __adfs_dir_get(dir, dir->pos, obj);  in adfs_f_getnext()
249 		dir->pos += 26;  in adfs_f_getnext()
257 	int pos = 5 + (ctx->pos - 2) * 26;  in adfs_f_iterate()
259 	while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {  in adfs_f_iterate()
266 		ctx->pos++;  in adfs_f_iterate()
276 	offset = 5 - (int)sizeof(de);  in adfs_f_update()
282 			adfs_error(dir->sb, "error reading directory entry");  in adfs_f_update()
283 			return -ENOENT;  in adfs_f_update()
286 			adfs_error(dir->sb, "unable to locate entry to update");  in adfs_f_update()
287 			return -ENOENT;  in adfs_f_update()
289 	} while (adfs_readval(de.dirinddiscadd, 3) != obj->indaddr);  in adfs_f_update()
291 	/* Update the directory entry with the new object state */  in adfs_f_update()
294 	/* Write the directory entry back to the directory */  in adfs_f_update()
302 	/* Increment directory sequence number */  in adfs_f_commit()
303 	dir->dirhead->startmasseq += 1;  in adfs_f_commit()
304 	dir->newtail->endmasseq += 1;  in adfs_f_commit()
306 	/* Update directory check byte */  in adfs_f_commit()
307 	dir->newtail->dircheckbyte = adfs_dir_checkbyte(dir);  in adfs_f_commit()
309 	/* Make sure the directory still validates correctly */  in adfs_f_commit()
312 		adfs_msg(dir->sb, KERN_ERR, "error: update broke directory");  in adfs_f_commit()