1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/fs/hpfs/ea.c 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * handling extended attributes 8 */ 9 10#include "hpfs_fn.h" 11 12/* Remove external extended attributes. ano specifies whether a is a 13 direct sector where eas starts or an anode */ 14 15void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) 16{ 17 unsigned pos = 0; 18 while (pos < len) { 19 char ex[4 + 255 + 1 + 8]; 20 struct extended_attribute *ea = (struct extended_attribute *)ex; 21 if (pos + 4 > len) { 22 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", 23 ano ? "anode" : "sectors", a, len); 24 return; 25 } 26 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; 27 if (ea_indirect(ea)) { 28 if (ea_valuelen(ea) != 8) { 29 hpfs_error(s, "ea_indirect(ea) set while ea->valuelen!=8, %s %08x, pos %08x", 30 ano ? "anode" : "sectors", a, pos); 31 return; 32 } 33 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4)) 34 return; 35 hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea)); 36 } 37 pos += ea->namelen + ea_valuelen(ea) + 5; 38 } 39 if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9); 40 else { 41 struct buffer_head *bh; 42 struct anode *anode; 43 if ((anode = hpfs_map_anode(s, a, &bh))) { 44 hpfs_remove_btree(s, &anode->btree); 45 brelse(bh); 46 hpfs_free_sectors(s, a, 1); 47 } 48 } 49} 50 51static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size) 52{ 53 char *ret; 54 if (!(ret = kmalloc(size + 1, GFP_NOFS))) { 55 pr_err("out of memory for EA\n"); 56 return NULL; 57 } 58 if (hpfs_ea_read(s, a, ano, 0, size, ret)) { 59 kfree(ret); 60 return NULL; 61 } 62 ret[size] = 0; 63 return ret; 64} 65 66static void set_indirect_ea(struct super_block *s, int ano, secno a, 67 const char *data, int size) 68{ 69 hpfs_ea_write(s, a, ano, 0, size, data); 70} 71 72/* Read an extended attribute named 'key' into the provided buffer */ 73 74int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, 75 char *buf, int size) 76{ 77 unsigned pos; 78 int ano, len; 79 secno a; 80 char ex[4 + 255 + 1 + 8]; 81 struct extended_attribute *ea; 82 struct extended_attribute *ea_end = fnode_end_ea(fnode); 83 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) 84 if (!strcmp(ea->name, key)) { 85 if (ea_indirect(ea)) 86 goto indirect; 87 if (ea_valuelen(ea) >= size) 88 return -EINVAL; 89 memcpy(buf, ea_data(ea), ea_valuelen(ea)); 90 buf[ea_valuelen(ea)] = 0; 91 return 0; 92 } 93 a = le32_to_cpu(fnode->ea_secno); 94 len = le32_to_cpu(fnode->ea_size_l); 95 ano = fnode_in_anode(fnode); 96 pos = 0; 97 while (pos < len) { 98 ea = (struct extended_attribute *)ex; 99 if (pos + 4 > len) { 100 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", 101 ano ? "anode" : "sectors", a, len); 102 return -EIO; 103 } 104 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO; 105 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) 106 return -EIO; 107 if (!strcmp(ea->name, key)) { 108 if (ea_indirect(ea)) 109 goto indirect; 110 if (ea_valuelen(ea) >= size) 111 return -EINVAL; 112 if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf)) 113 return -EIO; 114 buf[ea_valuelen(ea)] = 0; 115 return 0; 116 } 117 pos += ea->namelen + ea_valuelen(ea) + 5; 118 } 119 return -ENOENT; 120indirect: 121 if (ea_len(ea) >= size) 122 return -EINVAL; 123 if (hpfs_ea_read(s, ea_sec(ea), ea_in_anode(ea), 0, ea_len(ea), buf)) 124 return -EIO; 125 buf[ea_len(ea)] = 0; 126 return 0; 127} 128 129/* Read an extended attribute named 'key' */ 130char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size) 131{ 132 char *ret; 133 unsigned pos; 134 int ano, len; 135 secno a; 136 struct extended_attribute *ea; 137 struct extended_attribute *ea_end = fnode_end_ea(fnode); 138 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) 139 if (!strcmp(ea->name, key)) { 140 if (ea_indirect(ea)) 141 return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); 142 if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { 143 pr_err("out of memory for EA\n"); 144 return NULL; 145 } 146 memcpy(ret, ea_data(ea), ea_valuelen(ea)); 147 ret[ea_valuelen(ea)] = 0; 148 return ret; 149 } 150 a = le32_to_cpu(fnode->ea_secno); 151 len = le32_to_cpu(fnode->ea_size_l); 152 ano = fnode_in_anode(fnode); 153 pos = 0; 154 while (pos < len) { 155 char ex[4 + 255 + 1 + 8]; 156 ea = (struct extended_attribute *)ex; 157 if (pos + 4 > len) { 158 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", 159 ano ? "anode" : "sectors", a, len); 160 return NULL; 161 } 162 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL; 163 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) 164 return NULL; 165 if (!strcmp(ea->name, key)) { 166 if (ea_indirect(ea)) 167 return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); 168 if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { 169 pr_err("out of memory for EA\n"); 170 return NULL; 171 } 172 if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) { 173 kfree(ret); 174 return NULL; 175 } 176 ret[ea_valuelen(ea)] = 0; 177 return ret; 178 } 179 pos += ea->namelen + ea_valuelen(ea) + 5; 180 } 181 return NULL; 182} 183 184/* 185 * Update or create extended attribute 'key' with value 'data'. Note that 186 * when this ea exists, it MUST have the same size as size of data. 187 * This driver can't change sizes of eas ('cause I just don't need it). 188 */ 189 190void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, 191 const char *data, int size) 192{ 193 fnode_secno fno = inode->i_ino; 194 struct super_block *s = inode->i_sb; 195 unsigned pos; 196 int ano, len; 197 secno a; 198 unsigned char h[4]; 199 struct extended_attribute *ea; 200 struct extended_attribute *ea_end = fnode_end_ea(fnode); 201 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) 202 if (!strcmp(ea->name, key)) { 203 if (ea_indirect(ea)) { 204 if (ea_len(ea) == size) 205 set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); 206 } else if (ea_valuelen(ea) == size) { 207 memcpy(ea_data(ea), data, size); 208 } 209 return; 210 } 211 a = le32_to_cpu(fnode->ea_secno); 212 len = le32_to_cpu(fnode->ea_size_l); 213 ano = fnode_in_anode(fnode); 214 pos = 0; 215 while (pos < len) { 216 char ex[4 + 255 + 1 + 8]; 217 ea = (struct extended_attribute *)ex; 218 if (pos + 4 > len) { 219 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", 220 ano ? "anode" : "sectors", a, len); 221 return; 222 } 223 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; 224 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) 225 return; 226 if (!strcmp(ea->name, key)) { 227 if (ea_indirect(ea)) { 228 if (ea_len(ea) == size) 229 set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); 230 } 231 else { 232 if (ea_valuelen(ea) == size) 233 hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); 234 } 235 return; 236 } 237 pos += ea->namelen + ea_valuelen(ea) + 5; 238 } 239 if (!le16_to_cpu(fnode->ea_offs)) { 240 /*if (le16_to_cpu(fnode->ea_size_s)) { 241 hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0", 242 inode->i_ino, le16_to_cpu(fnode->ea_size_s)); 243 return; 244 }*/ 245 fnode->ea_offs = cpu_to_le16(0xc4); 246 } 247 if (le16_to_cpu(fnode->ea_offs) < 0xc4 || le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200) { 248 hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x", 249 (unsigned long)inode->i_ino, 250 le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s)); 251 return; 252 } 253 if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) && 254 le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5 <= 0x200) { 255 ea = fnode_end_ea(fnode); 256 *(char *)ea = 0; 257 ea->namelen = strlen(key); 258 ea->valuelen_lo = size; 259 ea->valuelen_hi = size >> 8; 260 strcpy(ea->name, key); 261 memcpy(ea_data(ea), data, size); 262 fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5); 263 goto ret; 264 } 265 /* Most the code here is 99.9993422% unused. I hope there are no bugs. 266 But what .. HPFS.IFS has also bugs in ea management. */ 267 if (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) { 268 secno n; 269 struct buffer_head *bh; 270 char *data; 271 if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return; 272 if (!(data = hpfs_get_sector(s, n, &bh))) { 273 hpfs_free_sectors(s, n, 1); 274 return; 275 } 276 memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s)); 277 fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s)); 278 fnode->ea_size_s = cpu_to_le16(0); 279 fnode->ea_secno = cpu_to_le32(n); 280 fnode->flags &= ~FNODE_anode; 281 mark_buffer_dirty(bh); 282 brelse(bh); 283 } 284 pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size; 285 len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9; 286 if (pos >= 30000) goto bail; 287 while (((pos + 511) >> 9) > len) { 288 if (!len) { 289 secno q = hpfs_alloc_sector(s, fno, 1, 0); 290 if (!q) goto bail; 291 fnode->ea_secno = cpu_to_le32(q); 292 fnode->flags &= ~FNODE_anode; 293 len++; 294 } else if (!fnode_in_anode(fnode)) { 295 if (hpfs_alloc_if_possible(s, le32_to_cpu(fnode->ea_secno) + len)) { 296 len++; 297 } else { 298 /* Aargh... don't know how to create ea anodes :-( */ 299 /*struct buffer_head *bh; 300 struct anode *anode; 301 anode_secno a_s; 302 if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh))) 303 goto bail; 304 anode->up = cpu_to_le32(fno); 305 anode->btree.fnode_parent = 1; 306 anode->btree.n_free_nodes--; 307 anode->btree.n_used_nodes++; 308 anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12); 309 anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno)); 310 anode->u.external[0].file_secno = cpu_to_le32(0); 311 anode->u.external[0].length = cpu_to_le32(len); 312 mark_buffer_dirty(bh); 313 brelse(bh); 314 fnode->flags |= FNODE_anode; 315 fnode->ea_secno = cpu_to_le32(a_s);*/ 316 secno new_sec; 317 int i; 318 if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9)))) 319 goto bail; 320 for (i = 0; i < len; i++) { 321 struct buffer_head *bh1, *bh2; 322 void *b1, *b2; 323 if (!(b1 = hpfs_map_sector(s, le32_to_cpu(fnode->ea_secno) + i, &bh1, len - i - 1))) { 324 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); 325 goto bail; 326 } 327 if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) { 328 brelse(bh1); 329 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); 330 goto bail; 331 } 332 memcpy(b2, b1, 512); 333 brelse(bh1); 334 mark_buffer_dirty(bh2); 335 brelse(bh2); 336 } 337 hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno), len); 338 fnode->ea_secno = cpu_to_le32(new_sec); 339 len = (pos + 511) >> 9; 340 } 341 } 342 if (fnode_in_anode(fnode)) { 343 if (hpfs_add_sector_to_btree(s, le32_to_cpu(fnode->ea_secno), 344 0, len) != -1) { 345 len++; 346 } else { 347 goto bail; 348 } 349 } 350 } 351 h[0] = 0; 352 h[1] = strlen(key); 353 h[2] = size & 0xff; 354 h[3] = size >> 8; 355 if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail; 356 if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail; 357 if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail; 358 fnode->ea_size_l = cpu_to_le32(pos); 359 ret: 360 hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size; 361 return; 362 bail: 363 if (le32_to_cpu(fnode->ea_secno)) 364 if (fnode_in_anode(fnode)) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9); 365 else hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno) + ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9), len - ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9)); 366 else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0); 367} 368 369