lib/e2p/feature.c

   1 /*
   2  * feature.c --- convert between features and strings
   3  *
   4  * Copyright (C) 1999  Theodore Ts'o <tytso@mit.edu>
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <ctype.h>
  17 #include <errno.h>
  18
  19 #include "e2p.h"
  20 #include <ext2fs/ext2fs.h>
  21 #include <ext2fs/kernel-jbd.h>
  22
  23 struct feature {
  24         int             compat;
  25         unsigned int    mask;
  26         const char      *string;
  27 };
  28
  29 static struct feature feature_list[] = {
  30         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
  31                         "dir_prealloc" },
  32         {       E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
  33                         "has_journal" },
  34         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
  35                         "imagic_inodes" },
  36         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
  37                         "ext_attr" },
  38         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
  39                         "dir_index" },
  40         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
  41                         "resize_inode" },
  42         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
  43                         "lazy_bg" },
  44         {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
  45                         "snapshot_bitmap" },
  46         {       E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_SPARSE_SUPER2,
  47                         "sparse_super2" },
  48
  49         {       E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
  50                         "sparse_super" },
  51         {       E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
  52                         "large_file" },
  53         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_HUGE_FILE,
  54                         "huge_file" },
  55         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
  56                         "uninit_bg" },
  57         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
  58                         "uninit_groups" },
  59         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_DIR_NLINK,
  60                         "dir_nlink" },
  61         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE,
  62                         "extra_isize" },
  63         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
  64                         "quota" },
  65         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
  66                         "bigalloc"},
  67         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM,
  68                         "metadata_csum"},
  69         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_REPLICA,
  70                         "replica" },
  71         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_READONLY,
  72                         "read-only" },
  73         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_PROJECT,
  74                         "project"},
  75         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS,
  76                         "shared_blocks"},
  77         {       E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_VERITY,
  78                         "verity"},
  79
  80         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
  81                         "compression" },
  82         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
  83                         "filetype" },
  84         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
  85                         "needs_recovery" },
  86         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
  87                         "journal_dev" },
  88         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
  89                         "extent" },
  90         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
  91                         "extents" },
  92         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
  93                         "meta_bg" },
  94         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
  95                         "64bit" },
  96         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
  97                         "mmp" },
  98         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
  99                         "flex_bg"},
 100         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
 101                         "ea_inode"},
 102         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
 103                         "dirdata"},
 104         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_CSUM_SEED,
 105                         "metadata_csum_seed"},
 106         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
 107                         "large_dir"},
 108         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
 109                         "inline_data"},
 110         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_ENCRYPT,
 111                         "encrypt"},
 112         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_CASEFOLD,
 113                         "casefold"},
 114         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_CASEFOLD,
 115                         "fname_encoding"},
 116         {       0, 0, 0 },
 117 };
 118
 119 static struct feature jrnl_feature_list[] = {
 120        {       E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
 121                        "journal_checksum" },
 122
 123        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
 124                        "journal_incompat_revoke" },
 125        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
 126                        "journal_64bit" },
 127        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
 128                        "journal_async_commit" },
 129        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
 130                        "journal_checksum_v2" },
 131        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V3,
 132                        "journal_checksum_v3" },
 133        {       0, 0, 0 },
 134 };
 135
 136 const char *e2p_feature2string(int compat, unsigned int mask)
 137 {
 138         struct feature  *f;
 139         static char buf[20];
 140         char    fchar;
 141         int     fnum;
 142
 143         for (f = feature_list; f->string; f++) {
 144                 if ((compat == f->compat) &&
 145                     (mask == f->mask))
 146                         return f->string;
 147         }
 148         switch (compat) {
 149         case  E2P_FEATURE_COMPAT:
 150                 fchar = 'C';
 151                 break;
 152         case E2P_FEATURE_INCOMPAT:
 153                 fchar = 'I';
 154                 break;
 155         case E2P_FEATURE_RO_INCOMPAT:
 156                 fchar = 'R';
 157                 break;
 158         default:
 159                 fchar = '?';
 160                 break;
 161         }
 162         for (fnum = 0; mask >>= 1; fnum++);
 163         sprintf(buf, "FEATURE_%c%d", fchar, fnum);
 164         return buf;
 165 }
 166
 167 int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
 168 {
 169         struct feature  *f;
 170         char            *eptr;
 171         int             num;
 172
 173         for (f = feature_list; f->string; f++) {
 174                 if (!strcasecmp(string, f->string)) {
 175                         *compat_type = f->compat;
 176                         *mask = f->mask;
 177                         return 0;
 178                 }
 179         }
 180         if (strncasecmp(string, "FEATURE_", 8))
 181                 return 1;
 182
 183         switch (string[8]) {
 184         case 'c':
 185         case 'C':
 186                 *compat_type = E2P_FEATURE_COMPAT;
 187                 break;
 188         case 'i':
 189         case 'I':
 190                 *compat_type = E2P_FEATURE_INCOMPAT;
 191                 break;
 192         case 'r':
 193         case 'R':
 194                 *compat_type = E2P_FEATURE_RO_INCOMPAT;
 195                 break;
 196         default:
 197                 return 1;
 198         }
 199         if (string[9] == 0)
 200                 return 1;
 201         num = strtol(string+9, &eptr, 10);
 202         if (num > 31 || num < 0)
 203                 return 1;
 204         if (*eptr)
 205                 return 1;
 206         *mask = 1 << num;
 207         return 0;
 208 }
 209
 210 const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
 211 {
 212         struct feature  *f;
 213         static char buf[20];
 214         char    fchar;
 215         int     fnum;
 216
 217         for (f = jrnl_feature_list; f->string; f++) {
 218                 if ((compat == f->compat) &&
 219                     (mask == f->mask))
 220                         return f->string;
 221         }
 222         switch (compat) {
 223         case  E2P_FEATURE_COMPAT:
 224                 fchar = 'C';
 225                 break;
 226         case E2P_FEATURE_INCOMPAT:
 227                 fchar = 'I';
 228                 break;
 229         case E2P_FEATURE_RO_INCOMPAT:
 230                 fchar = 'R';
 231                 break;
 232         default:
 233                 fchar = '?';
 234                 break;
 235         }
 236         for (fnum = 0; mask >>= 1; fnum++);
 237         sprintf(buf, "FEATURE_%c%d", fchar, fnum);
 238         return buf;
 239 }
 240
 241 int e2p_jrnl_string2feature(char *string, int *compat_type, unsigned int *mask)
 242 {
 243         struct feature  *f;
 244         char            *eptr;
 245         int             num;
 246
 247         for (f = jrnl_feature_list; f->string; f++) {
 248                 if (!strcasecmp(string, f->string)) {
 249                         *compat_type = f->compat;
 250                         *mask = f->mask;
 251                         return 0;
 252                 }
 253         }
 254         if (strncasecmp(string, "FEATURE_", 8))
 255                 return 1;
 256
 257         switch (string[8]) {
 258         case 'c':
 259         case 'C':
 260                 *compat_type = E2P_FEATURE_COMPAT;
 261                 break;
 262         case 'i':
 263         case 'I':
 264                 *compat_type = E2P_FEATURE_INCOMPAT;
 265                 break;
 266         case 'r':
 267         case 'R':
 268                 *compat_type = E2P_FEATURE_RO_INCOMPAT;
 269                 break;
 270         default:
 271                 return 1;
 272         }
 273         if (string[9] == 0)
 274                 return 1;
 275         num = strtol(string+9, &eptr, 10);
 276         if (num > 31 || num < 0)
 277                 return 1;
 278         if (*eptr)
 279                 return 1;
 280         *mask = 1 << num;
 281         return 0;
 282 }
 283 static char *skip_over_blanks(char *cp)
 284 {
 285         while (*cp && isspace(*cp))
 286                 cp++;
 287         return cp;
 288 }
 289
 290 static char *skip_over_word(char *cp)
 291 {
 292         while (*cp && !isspace(*cp) && *cp != ',')
 293                 cp++;
 294         return cp;
 295 }
 296
 297 /*
 298  * Edit a feature set array as requested by the user.  The ok_array,
 299  * if set, allows the application to limit what features the user is
 300  * allowed to set or clear using this function.  If clear_ok_array is set,
 301  * then use it tell whether or not it is OK to clear a filesystem feature.
 302  */
 303 int e2p_edit_feature2(const char *str, __u32 *compat_array, __u32 *ok_array,
 304                       __u32 *clear_ok_array, int *type_err,
 305                       unsigned int *mask_err)
 306 {
 307         char            *cp, *buf, *next;
 308         int             neg;
 309         unsigned int    mask;
 310         int             compat_type;
 311         int             rc = 0;
 312
 313         if (!clear_ok_array)
 314                 clear_ok_array = ok_array;
 315
 316         if (type_err)
 317                 *type_err = 0;
 318         if (mask_err)
 319                 *mask_err = 0;
 320
 321         buf = malloc(strlen(str)+1);
 322         if (!buf)
 323                 return 1;
 324         strcpy(buf, str);
 325         for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
 326                 neg = 0;
 327                 cp = skip_over_blanks(cp);
 328                 next = skip_over_word(cp);
 329
 330                 if (*next == 0)
 331                         next = 0;
 332                 else
 333                         *next = 0;
 334
 335                 if ((strcasecmp(cp, "none") == 0) ||
 336                     (strcasecmp(cp, "clear") == 0)) {
 337                         compat_array[0] = 0;
 338                         compat_array[1] = 0;
 339                         compat_array[2] = 0;
 340                         continue;
 341                 }
 342
 343                 switch (*cp) {
 344                 case '-':
 345                 case '^':
 346                         neg++;
 347                         /* fallthrough */
 348                 case '+':
 349                         cp++;
 350                         break;
 351                 }
 352                 if (e2p_string2feature(cp, &compat_type, &mask)) {
 353                         rc = 1;
 354                         break;
 355                 }
 356                 if (neg) {
 357                         if (clear_ok_array &&
 358                             !(clear_ok_array[compat_type] & mask)) {
 359                                 rc = 1;
 360                                 if (type_err)
 361                                         *type_err = (compat_type |
 362                                                      E2P_FEATURE_NEGATE_FLAG);
 363                                 if (mask_err)
 364                                         *mask_err = mask;
 365                                 break;
 366                         }
 367                         compat_array[compat_type] &= ~mask;
 368                 } else {
 369                         if (ok_array && !(ok_array[compat_type] & mask)) {
 370                                 rc = 1;
 371                                 if (type_err)
 372                                         *type_err = compat_type;
 373                                 if (mask_err)
 374                                         *mask_err = mask;
 375                                 break;
 376                         }
 377                         compat_array[compat_type] |= mask;
 378                 }
 379         }
 380         free(buf);
 381         return rc;
 382 }
 383
 384 int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
 385 {
 386         return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
 387 }
 388
 389 #ifdef TEST_PROGRAM
 390 int main(int argc, char **argv)
 391 {
 392         int compat, compat2, i;
 393         unsigned int mask, mask2;
 394         const char *str;
 395         struct feature *f;
 396
 397         for (i = 0; i < 2; i++) {
 398                 if (i == 0) {
 399                         f = feature_list;
 400                         printf("Feature list:\n");
 401                 } else {
 402                         printf("\nJournal feature list:\n");
 403                         f = jrnl_feature_list;
 404                 }
 405                 for (; f->string; f++) {
 406                         if (i == 0) {
 407                                 e2p_string2feature((char *)f->string, &compat,
 408                                                    &mask);
 409                                 str = e2p_feature2string(compat, mask);
 410                         } else {
 411                                 e2p_jrnl_string2feature((char *)f->string,
 412                                                         &compat, &mask);
 413                                 str = e2p_jrnl_feature2string(compat, mask);
 414                         }
 415
 416                         printf("\tCompat = %d, Mask = %u, %s\n",
 417                                compat, mask, f->string);
 418                         if (strcmp(f->string, str)) {
 419                                 if (e2p_string2feature((char *) str, &compat2,
 420                                                        &mask2) ||
 421                                     (compat2 != compat) ||
 422                                     (mask2 != mask)) {
 423                                         fprintf(stderr, "Failure!\n");
 424                                         exit(1);
 425                                 }
 426                         }
 427                 }
 428         }
 429         exit(0);
 430 }
 431 #endif