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