fs/affs/inode.c

   1 /*
   2  *  linux/fs/affs/inode.c
   3  *
   4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
   5  *
   6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
   7  *
   8  *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
   9  *
  10  *  (C) 1991  Linus Torvalds - minix filesystem
  11  */
  12 #include <linux/sched.h>
  13 #include <linux/cred.h>
  14 #include <linux/gfp.h>
  15 #include "affs.h"
  16
  17 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
  18 {
  19         struct affs_sb_info     *sbi = AFFS_SB(sb);
  20         struct buffer_head      *bh;
  21         struct affs_tail        *tail;
  22         struct inode            *inode;
  23         u32                      block;
  24         u32                      size;
  25         u32                      prot;
  26         u16                      id;
  27
  28         inode = iget_locked(sb, ino);
  29         if (!inode)
  30                 return ERR_PTR(-ENOMEM);
  31         if (!(inode->i_state & I_NEW))
  32                 return inode;
  33
  34         pr_debug("affs_iget(%lu)\n", inode->i_ino);
  35
  36         block = inode->i_ino;
  37         bh = affs_bread(sb, block);
  38         if (!bh) {
  39                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  40                 goto bad_inode;
  41         }
  42         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  43                 affs_warning(sb,"read_inode",
  44                            "Checksum or type (ptype=%d) error on inode %d",
  45                            AFFS_HEAD(bh)->ptype, block);
  46                 goto bad_inode;
  47         }
  48
  49         tail = AFFS_TAIL(sb, bh);
  50         prot = be32_to_cpu(tail->protect);
  51
  52         inode->i_size = 0;
  53         set_nlink(inode, 1);
  54         inode->i_mode = 0;
  55         AFFS_I(inode)->i_extcnt = 1;
  56         AFFS_I(inode)->i_ext_last = ~1;
  57         AFFS_I(inode)->i_protect = prot;
  58         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
  59         AFFS_I(inode)->i_blkcnt = 0;
  60         AFFS_I(inode)->i_lc = NULL;
  61         AFFS_I(inode)->i_lc_size = 0;
  62         AFFS_I(inode)->i_lc_shift = 0;
  63         AFFS_I(inode)->i_lc_mask = 0;
  64         AFFS_I(inode)->i_ac = NULL;
  65         AFFS_I(inode)->i_ext_bh = NULL;
  66         AFFS_I(inode)->mmu_private = 0;
  67         AFFS_I(inode)->i_lastalloc = 0;
  68         AFFS_I(inode)->i_pa_cnt = 0;
  69
  70         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
  71                 inode->i_mode = sbi->s_mode;
  72         else
  73                 inode->i_mode = affs_prot_to_mode(prot);
  74
  75         id = be16_to_cpu(tail->uid);
  76         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
  77                 inode->i_uid = sbi->s_uid;
  78         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
  79                 i_uid_write(inode, 0);
  80         else
  81                 i_uid_write(inode, id);
  82
  83         id = be16_to_cpu(tail->gid);
  84         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
  85                 inode->i_gid = sbi->s_gid;
  86         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
  87                 i_gid_write(inode, 0);
  88         else
  89                 i_gid_write(inode, id);
  90
  91         switch (be32_to_cpu(tail->stype)) {
  92         case ST_ROOT:
  93                 inode->i_uid = sbi->s_uid;
  94                 inode->i_gid = sbi->s_gid;
  95                 /* fall through */
  96         case ST_USERDIR:
  97                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
  98                     affs_test_opt(sbi->s_flags, SF_SETMODE)) {
  99                         if (inode->i_mode & S_IRUSR)
 100                                 inode->i_mode |= S_IXUSR;
 101                         if (inode->i_mode & S_IRGRP)
 102                                 inode->i_mode |= S_IXGRP;
 103                         if (inode->i_mode & S_IROTH)
 104                                 inode->i_mode |= S_IXOTH;
 105                         inode->i_mode |= S_IFDIR;
 106                 } else
 107                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 108                 /* Maybe it should be controlled by mount parameter? */
 109                 //inode->i_mode |= S_ISVTX;
 110                 inode->i_op = &affs_dir_inode_operations;
 111                 inode->i_fop = &affs_dir_operations;
 112                 break;
 113         case ST_LINKDIR:
 114 #if 0
 115                 affs_warning(sb, "read_inode", "inode is LINKDIR");
 116                 goto bad_inode;
 117 #else
 118                 inode->i_mode |= S_IFDIR;
 119                 /* ... and leave ->i_op and ->i_fop pointing to empty */
 120                 break;
 121 #endif
 122         case ST_LINKFILE:
 123                 affs_warning(sb, "read_inode", "inode is LINKFILE");
 124                 goto bad_inode;
 125         case ST_FILE:
 126                 size = be32_to_cpu(tail->size);
 127                 inode->i_mode |= S_IFREG;
 128                 AFFS_I(inode)->mmu_private = inode->i_size = size;
 129                 if (inode->i_size) {
 130                         AFFS_I(inode)->i_blkcnt = (size - 1) /
 131                                                sbi->s_data_blksize + 1;
 132                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 133                                                sbi->s_hashsize + 1;
 134                 }
 135                 if (tail->link_chain)
 136                         set_nlink(inode, 2);
 137                 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
 138                                           &affs_aops_ofs : &affs_aops;
 139                 inode->i_op = &affs_file_inode_operations;
 140                 inode->i_fop = &affs_file_operations;
 141                 break;
 142         case ST_SOFTLINK:
 143                 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);
 144                 inode->i_mode |= S_IFLNK;
 145                 inode_nohighmem(inode);
 146                 inode->i_op = &affs_symlink_inode_operations;
 147                 inode->i_data.a_ops = &affs_symlink_aops;
 148                 break;
 149         }
 150
 151         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 152                        = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 153                          be32_to_cpu(tail->change.mins) * 60 +
 154                          be32_to_cpu(tail->change.ticks) / 50 +
 155                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 156                          sys_tz.tz_minuteswest * 60;
 157         inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 158         affs_brelse(bh);
 159         unlock_new_inode(inode);
 160         return inode;
 161
 162 bad_inode:
 163         affs_brelse(bh);
 164         iget_failed(inode);
 165         return ERR_PTR(-EIO);
 166 }
 167
 168 int
 169 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 170 {
 171         struct super_block      *sb = inode->i_sb;
 172         struct buffer_head      *bh;
 173         struct affs_tail        *tail;
 174         uid_t                    uid;
 175         gid_t                    gid;
 176
 177         pr_debug("write_inode(%lu)\n", inode->i_ino);
 178
 179         if (!inode->i_nlink)
 180                 // possibly free block
 181                 return 0;
 182         bh = affs_bread(sb, inode->i_ino);
 183         if (!bh) {
 184                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 185                 return -EIO;
 186         }
 187         tail = AFFS_TAIL(sb, bh);
 188         if (tail->stype == cpu_to_be32(ST_ROOT)) {
 189                 affs_secs_to_datestamp(inode->i_mtime.tv_sec,
 190                                        &AFFS_ROOT_TAIL(sb, bh)->root_change);
 191         } else {
 192                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 193                 tail->size = cpu_to_be32(inode->i_size);
 194                 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
 195                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 196                         uid = i_uid_read(inode);
 197                         gid = i_gid_read(inode);
 198                         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
 199                                 if (uid == 0 || uid == 0xFFFF)
 200                                         uid = uid ^ ~0;
 201                                 if (gid == 0 || gid == 0xFFFF)
 202                                         gid = gid ^ ~0;
 203                         }
 204                         if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
 205                                 tail->uid = cpu_to_be16(uid);
 206                         if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
 207                                 tail->gid = cpu_to_be16(gid);
 208                 }
 209         }
 210         affs_fix_checksum(sb, bh);
 211         mark_buffer_dirty_inode(bh, inode);
 212         affs_brelse(bh);
 213         affs_free_prealloc(inode);
 214         return 0;
 215 }
 216
 217 int
 218 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 219 {
 220         struct inode *inode = d_inode(dentry);
 221         int error;
 222
 223         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
 224
 225         error = setattr_prepare(dentry, attr);
 226         if (error)
 227                 goto out;
 228
 229         if (((attr->ia_valid & ATTR_UID) &&
 230               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
 231             ((attr->ia_valid & ATTR_GID) &&
 232               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
 233             ((attr->ia_valid & ATTR_MODE) &&
 234              (AFFS_SB(inode->i_sb)->s_flags &
 235               (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
 236                 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
 237                         error = -EPERM;
 238                 goto out;
 239         }
 240
 241         if ((attr->ia_valid & ATTR_SIZE) &&
 242             attr->ia_size != i_size_read(inode)) {
 243                 error = inode_newsize_ok(inode, attr->ia_size);
 244                 if (error)
 245                         return error;
 246
 247                 truncate_setsize(inode, attr->ia_size);
 248                 affs_truncate(inode);
 249         }
 250
 251         setattr_copy(inode, attr);
 252         mark_inode_dirty(inode);
 253
 254         if (attr->ia_valid & ATTR_MODE)
 255                 affs_mode_to_prot(inode);
 256 out:
 257         return error;
 258 }
 259
 260 void
 261 affs_evict_inode(struct inode *inode)
 262 {
 263         unsigned long cache_page;
 264         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
 265                  inode->i_ino, inode->i_nlink);
 266         truncate_inode_pages_final(&inode->i_data);
 267
 268         if (!inode->i_nlink) {
 269                 inode->i_size = 0;
 270                 affs_truncate(inode);
 271         }
 272
 273         invalidate_inode_buffers(inode);
 274         clear_inode(inode);
 275         affs_free_prealloc(inode);
 276         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 277         if (cache_page) {
 278                 pr_debug("freeing ext cache\n");
 279                 AFFS_I(inode)->i_lc = NULL;
 280                 AFFS_I(inode)->i_ac = NULL;
 281                 free_page(cache_page);
 282         }
 283         affs_brelse(AFFS_I(inode)->i_ext_bh);
 284         AFFS_I(inode)->i_ext_last = ~1;
 285         AFFS_I(inode)->i_ext_bh = NULL;
 286
 287         if (!inode->i_nlink)
 288                 affs_free_block(inode->i_sb, inode->i_ino);
 289 }
 290
 291 struct inode *
 292 affs_new_inode(struct inode *dir)
 293 {
 294         struct super_block      *sb = dir->i_sb;
 295         struct inode            *inode;
 296         u32                      block;
 297         struct buffer_head      *bh;
 298
 299         if (!(inode = new_inode(sb)))
 300                 goto err_inode;
 301
 302         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 303                 goto err_block;
 304
 305         bh = affs_getzeroblk(sb, block);
 306         if (!bh)
 307                 goto err_bh;
 308         mark_buffer_dirty_inode(bh, inode);
 309         affs_brelse(bh);
 310
 311         inode->i_uid     = current_fsuid();
 312         inode->i_gid     = current_fsgid();
 313         inode->i_ino     = block;
 314         set_nlink(inode, 1);
 315         inode->i_mtime   = inode->i_atime = inode->i_ctime = current_time(inode);
 316         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 317         AFFS_I(inode)->i_blkcnt = 0;
 318         AFFS_I(inode)->i_lc = NULL;
 319         AFFS_I(inode)->i_lc_size = 0;
 320         AFFS_I(inode)->i_lc_shift = 0;
 321         AFFS_I(inode)->i_lc_mask = 0;
 322         AFFS_I(inode)->i_ac = NULL;
 323         AFFS_I(inode)->i_ext_bh = NULL;
 324         AFFS_I(inode)->mmu_private = 0;
 325         AFFS_I(inode)->i_protect = 0;
 326         AFFS_I(inode)->i_lastalloc = 0;
 327         AFFS_I(inode)->i_pa_cnt = 0;
 328         AFFS_I(inode)->i_extcnt = 1;
 329         AFFS_I(inode)->i_ext_last = ~1;
 330
 331         insert_inode_hash(inode);
 332
 333         return inode;
 334
 335 err_bh:
 336         affs_free_block(sb, block);
 337 err_block:
 338         iput(inode);
 339 err_inode:
 340         return NULL;
 341 }
 342
 343 /*
 344  * Add an entry to a directory. Create the header block
 345  * and insert it into the hash table.
 346  */
 347
 348 int
 349 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 350 {
 351         struct super_block *sb = dir->i_sb;
 352         struct buffer_head *inode_bh = NULL;
 353         struct buffer_head *bh;
 354         u32 block = 0;
 355         int retval;
 356
 357         pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
 358                  dir->i_ino, inode->i_ino, dentry, type);
 359
 360         retval = -EIO;
 361         bh = affs_bread(sb, inode->i_ino);
 362         if (!bh)
 363                 goto done;
 364
 365         affs_lock_link(inode);
 366         switch (type) {
 367         case ST_LINKFILE:
 368         case ST_LINKDIR:
 369                 retval = -ENOSPC;
 370                 block = affs_alloc_block(dir, dir->i_ino);
 371                 if (!block)
 372                         goto err;
 373                 retval = -EIO;
 374                 inode_bh = bh;
 375                 bh = affs_getzeroblk(sb, block);
 376                 if (!bh)
 377                         goto err;
 378                 break;
 379         default:
 380                 break;
 381         }
 382
 383         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 384         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 385         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 386         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 387         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 388
 389         if (inode_bh) {
 390                 __be32 chain;
 391                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 392                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 393                 AFFS_TAIL(sb, bh)->link_chain = chain;
 394                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 395                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 396                 mark_buffer_dirty_inode(inode_bh, inode);
 397                 set_nlink(inode, 2);
 398                 ihold(inode);
 399         }
 400         affs_fix_checksum(sb, bh);
 401         mark_buffer_dirty_inode(bh, inode);
 402         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 403
 404         affs_lock_dir(dir);
 405         retval = affs_insert_hash(dir, bh);
 406         mark_buffer_dirty_inode(bh, inode);
 407         affs_unlock_dir(dir);
 408         affs_unlock_link(inode);
 409
 410         d_instantiate(dentry, inode);
 411 done:
 412         affs_brelse(inode_bh);
 413         affs_brelse(bh);
 414         return retval;
 415 err:
 416         if (block)
 417                 affs_free_block(sb, block);
 418         affs_unlock_link(inode);
 419         goto done;
 420 }