| 1 | |
| 2 | |
| 3 | * linux/fs/hpfs/ea.c
|
| 4 | *
|
| 5 | * Mikulas Patocka ([email protected]), 1998-1999
|
| 6 | *
|
| 7 | * handling extended attributes
|
| 8 |
|
| 9 |
|
| 10 | #include "hpfs_fn.h"
|
| 11 |
|
| 12 | |
| 13 | direct sector where eas starts or an anode
|
| 14 |
|
| 15 | void 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, GET_BTREE_PTR(&anode->btree));
|
| 45 | brelse(bh);
|
| 46 | hpfs_free_sectors(s, a, 1);
|
| 47 | }
|
| 48 | }
|
| 49 | }
|
| 50 |
|
| 51 | static 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 |
|
| 66 | static 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 |
|
| 73 |
|
| 74 | int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key,
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| 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;
|
| 120 | indirect:
|
| 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 |
|
| 130 | char *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 |
|
| 190 | void 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 | |
| 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 %08llx: ea_offs == %03x, ea_size_s == %03x",
|
| 249 | 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 | |
| 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 |
|
| 299 | |
| 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 |
|