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/jfs_user.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
  72         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
  73                         "compression" },
  74         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
  75                         "filetype" },
  76         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
  77                         "needs_recovery" },
  78         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
  79                         "journal_dev" },
  80         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
  81                         "extent" },
  82         {       E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
  83                         "extents" },
  84         {       E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
  85                         "meta_bg" },
  86         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
  87                         "64bit" },
  88         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
  89                         "mmp" },
  90         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
  91                         "flex_bg"},
  92         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
  93                         "ea_inode"},
  94         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
  95                         "dirdata"},
  96         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
  97                         "large_dir"},
  98         {       E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
  99                         "inline_data"},
 100         {       0, 0, 0 },
 101 };
 102
 103 static struct feature jrnl_feature_list[] = {
 104        {       E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
 105                        "journal_checksum" },
 106
 107        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
 108                        "journal_incompat_revoke" },
 109        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
 110                        "journal_64bit" },
 111        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
 112                        "journal_async_commit" },
 113        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
 114                        "journal_checksum_v2" },
 115        {       0, 0, 0 },
 116 };
 117
 118 const char *e2p_feature2string(int compat, unsigned int mask)
 119 {
 120         struct feature  *f;
 121         static char buf[20];
 122         char    fchar;
 123         int     fnum;
 124
 125         for (f = feature_list; f->string; f++) {
 126                 if ((compat == f->compat) &&
 127                     (mask == f->mask))
 128                         return f->string;
 129         }
 130         switch (compat) {
 131         case  E2P_FEATURE_COMPAT:
 132                 fchar = 'C';
 133                 break;
 134         case E2P_FEATURE_INCOMPAT:
 135                 fchar = 'I';
 136                 break;
 137         case E2P_FEATURE_RO_INCOMPAT:
 138                 fchar = 'R';
 139                 break;
 140         default:
 141                 fchar = '?';
 142                 break;
 143         }
 144         for (fnum = 0; mask >>= 1; fnum++);
 145         sprintf(buf, "FEATURE_%c%d", fchar, fnum);
 146         return buf;
 147 }
 148
 149 int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
 150 {
 151         struct feature  *f;
 152         char            *eptr;
 153         int             num;
 154
 155         for (f = feature_list; f->string; f++) {
 156                 if (!strcasecmp(string, f->string)) {
 157                         *compat_type = f->compat;
 158                         *mask = f->mask;
 159                         return 0;
 160                 }
 161         }
 162         if (strncasecmp(string, "FEATURE_", 8))
 163                 return 1;
 164
 165         switch (string[8]) {
 166         case 'c':
 167         case 'C':
 168                 *compat_type = E2P_FEATURE_COMPAT;
 169                 break;
 170         case 'i':
 171         case 'I':
 172                 *compat_type = E2P_FEATURE_INCOMPAT;
 173                 break;
 174         case 'r':
 175         case 'R':
 176                 *compat_type = E2P_FEATURE_RO_INCOMPAT;
 177                 break;
 178         default:
 179                 return 1;
 180         }
 181         if (string[9] == 0)
 182                 return 1;
 183         num = strtol(string+9, &eptr, 10);
 184         if (num > 32 || num < 0)
 185                 return 1;
 186         if (*eptr)
 187                 return 1;
 188         *mask = 1 << num;
 189         return 0;
 190 }
 191
 192 const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
 193 {
 194         struct feature  *f;
 195         static char buf[20];
 196         char    fchar;
 197         int     fnum;
 198
 199         for (f = jrnl_feature_list; f->string; f++) {
 200                 if ((compat == f->compat) &&
 201                     (mask == f->mask))
 202                         return f->string;
 203         }
 204         switch (compat) {
 205         case  E2P_FEATURE_COMPAT:
 206                 fchar = 'C';
 207                 break;
 208         case E2P_FEATURE_INCOMPAT:
 209                 fchar = 'I';
 210                 break;
 211         case E2P_FEATURE_RO_INCOMPAT:
 212                 fchar = 'R';
 213                 break;
 214         default:
 215                 fchar = '?';
 216                 break;
 217         }
 218         for (fnum = 0; mask >>= 1; fnum++);
 219         sprintf(buf, "FEATURE_%c%d", fchar, fnum);
 220         return buf;
 221 }
 222
 223 int e2p_jrnl_string2feature(char *string, int *compat_type, unsigned int *mask)
 224 {
 225         struct feature  *f;
 226         char            *eptr;
 227         int             num;
 228
 229         for (f = jrnl_feature_list; f->string; f++) {
 230                 if (!strcasecmp(string, f->string)) {
 231                         *compat_type = f->compat;
 232                         *mask = f->mask;
 233                         return 0;
 234                 }
 235         }
 236         if (strncasecmp(string, "FEATURE_", 8))
 237                 return 1;
 238
 239         switch (string[8]) {
 240         case 'c':
 241         case 'C':
 242                 *compat_type = E2P_FEATURE_COMPAT;
 243                 break;
 244         case 'i':
 245         case 'I':
 246                 *compat_type = E2P_FEATURE_INCOMPAT;
 247                 break;
 248         case 'r':
 249         case 'R':
 250                 *compat_type = E2P_FEATURE_RO_INCOMPAT;
 251                 break;
 252         default:
 253                 return 1;
 254         }
 255         if (string[9] == 0)
 256                 return 1;
 257         num = strtol(string+9, &eptr, 10);
 258         if (num > 32 || num < 0)
 259                 return 1;
 260         if (*eptr)
 261                 return 1;
 262         *mask = 1 << num;
 263         return 0;
 264 }
 265 static char *skip_over_blanks(char *cp)
 266 {
 267         while (*cp && isspace(*cp))
 268                 cp++;
 269         return cp;
 270 }
 271
 272 static char *skip_over_word(char *cp)
 273 {
 274         while (*cp && !isspace(*cp) && *cp != ',')
 275                 cp++;
 276         return cp;
 277 }
 278
 279 /*
 280  * Edit a feature set array as requested by the user.  The ok_array,
 281  * if set, allows the application to limit what features the user is
 282  * allowed to set or clear using this function.  If clear_ok_array is set,
 283  * then use it tell whether or not it is OK to clear a filesystem feature.
 284  */
 285 int e2p_edit_feature2(const char *str, __u32 *compat_array, __u32 *ok_array,
 286                       __u32 *clear_ok_array, int *type_err,
 287                       unsigned int *mask_err)
 288 {
 289         char            *cp, *buf, *next;
 290         int             neg;
 291         unsigned int    mask;
 292         int             compat_type;
 293         int             rc = 0;
 294
 295         if (!clear_ok_array)
 296                 clear_ok_array = ok_array;
 297
 298         if (type_err)
 299                 *type_err = 0;
 300         if (mask_err)
 301                 *mask_err = 0;
 302
 303         buf = malloc(strlen(str)+1);
 304         if (!buf)
 305                 return 1;
 306         strcpy(buf, str);
 307         for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
 308                 neg = 0;
 309                 cp = skip_over_blanks(cp);
 310                 next = skip_over_word(cp);
 311
 312                 if (*next == 0)
 313                         next = 0;
 314                 else
 315                         *next = 0;
 316
 317                 if ((strcasecmp(cp, "none") == 0) ||
 318                     (strcasecmp(cp, "clear") == 0)) {
 319                         compat_array[0] = 0;
 320                         compat_array[1] = 0;
 321                         compat_array[2] = 0;
 322                         continue;
 323                 }
 324
 325                 switch (*cp) {
 326                 case '-':
 327                 case '^':
 328                         neg++;
 329                         /* fallthrough */
 330                 case '+':
 331                         cp++;
 332                         break;
 333                 }
 334                 if (e2p_string2feature(cp, &compat_type, &mask)) {
 335                         rc = 1;
 336                         break;
 337                 }
 338                 if (neg) {
 339                         if (clear_ok_array &&
 340                             !(clear_ok_array[compat_type] & mask)) {
 341                                 rc = 1;
 342                                 if (type_err)
 343                                         *type_err = (compat_type |
 344                                                      E2P_FEATURE_NEGATE_FLAG);
 345                                 if (mask_err)
 346                                         *mask_err = mask;
 347                                 break;
 348                         }
 349                         compat_array[compat_type] &= ~mask;
 350                 } else {
 351                         if (ok_array && !(ok_array[compat_type] & mask)) {
 352                                 rc = 1;
 353                                 if (type_err)
 354                                         *type_err = compat_type;
 355                                 if (mask_err)
 356                                         *mask_err = mask;
 357                                 break;
 358                         }
 359                         compat_array[compat_type] |= mask;
 360                 }
 361         }
 362         free(buf);
 363         return rc;
 364 }
 365
 366 int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
 367 {
 368         return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
 369 }
 370
 371 #ifdef TEST_PROGRAM
 372 int main(int argc, char **argv)
 373 {
 374         int compat, compat2, i;
 375         unsigned int mask, mask2;
 376         const char *str;
 377         struct feature *f;
 378
 379         for (i = 0; i < 2; i++) {
 380                 if (i == 0) {
 381                         f = feature_list;
 382                         printf("Feature list:\n");
 383                 } else {
 384                         printf("\nJournal feature list:\n");
 385                         f = jrnl_feature_list;
 386                 }
 387                 for (; f->string; f++) {
 388                         if (i == 0) {
 389                                 e2p_string2feature((char *)f->string, &compat,
 390                                                    &mask);
 391                                 str = e2p_feature2string(compat, mask);
 392                         } else {
 393                                 e2p_jrnl_string2feature((char *)f->string,
 394                                                         &compat, &mask);
 395                                 str = e2p_jrnl_feature2string(compat, mask);
 396                         }
 397
 398                         printf("\tCompat = %d, Mask = %u, %s\n",
 399                                compat, mask, f->string);
 400                         if (strcmp(f->string, str)) {
 401                                 if (e2p_string2feature((char *) str, &compat2,
 402                                                        &mask2) ||
 403                                     (compat2 != compat) ||
 404                                     (mask2 != mask)) {
 405                                         fprintf(stderr, "Failure!\n");
 406                                         exit(1);
 407                                 }
 408                         }
 409                 }
 410         }
 411         exit(0);
 412 }
 413 #endif