fs/hpfs/ea.c

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