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 "affs.h"
  14
  15 extern const struct inode_operations affs_symlink_inode_operations;
  16 extern struct timezone sys_tz;
  17
  18 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
  19 {
  20         struct affs_sb_info     *sbi = AFFS_SB(sb);
  21         struct buffer_head      *bh;
  22         struct affs_head        *head;
  23         struct affs_tail        *tail;
  24         struct inode            *inode;
  25         u32                      block;
  26         u32                      size;
  27         u32                      prot;
  28         u16                      id;
  29
  30         inode = iget_locked(sb, ino);
  31         if (!inode)
  32                 return ERR_PTR(-ENOMEM);
  33         if (!(inode->i_state & I_NEW))
  34                 return inode;
  35
  36         pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
  37
  38         block = inode->i_ino;
  39         bh = affs_bread(sb, block);
  40         if (!bh) {
  41                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  42                 goto bad_inode;
  43         }
  44         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  45                 affs_warning(sb,"read_inode",
  46                            "Checksum or type (ptype=%d) error on inode %d",
  47                            AFFS_HEAD(bh)->ptype, block);
  48                 goto bad_inode;
  49         }
  50
  51         head = AFFS_HEAD(bh);
  52         tail = AFFS_TAIL(sb, bh);
  53         prot = be32_to_cpu(tail->protect);
  54
  55         inode->i_size = 0;
  56         inode->i_nlink = 1;
  57         inode->i_mode = 0;
  58         AFFS_I(inode)->i_extcnt = 1;
  59         AFFS_I(inode)->i_ext_last = ~1;
  60         AFFS_I(inode)->i_protect = prot;
  61         AFFS_I(inode)->i_opencnt = 0;
  62         AFFS_I(inode)->i_blkcnt = 0;
  63         AFFS_I(inode)->i_lc = NULL;
  64         AFFS_I(inode)->i_lc_size = 0;
  65         AFFS_I(inode)->i_lc_shift = 0;
  66         AFFS_I(inode)->i_lc_mask = 0;
  67         AFFS_I(inode)->i_ac = NULL;
  68         AFFS_I(inode)->i_ext_bh = NULL;
  69         AFFS_I(inode)->mmu_private = 0;
  70         AFFS_I(inode)->i_lastalloc = 0;
  71         AFFS_I(inode)->i_pa_cnt = 0;
  72
  73         if (sbi->s_flags & SF_SETMODE)
  74                 inode->i_mode = sbi->s_mode;
  75         else
  76                 inode->i_mode = prot_to_mode(prot);
  77
  78         id = be16_to_cpu(tail->uid);
  79         if (id == 0 || sbi->s_flags & SF_SETUID)
  80                 inode->i_uid = sbi->s_uid;
  81         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  82                 inode->i_uid = 0;
  83         else
  84                 inode->i_uid = id;
  85
  86         id = be16_to_cpu(tail->gid);
  87         if (id == 0 || sbi->s_flags & SF_SETGID)
  88                 inode->i_gid = sbi->s_gid;
  89         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  90                 inode->i_gid = 0;
  91         else
  92                 inode->i_gid = id;
  93
  94         switch (be32_to_cpu(tail->stype)) {
  95         case ST_ROOT:
  96                 inode->i_uid = sbi->s_uid;
  97                 inode->i_gid = sbi->s_gid;
  98                 /* fall through */
  99         case ST_USERDIR:
 100                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
 101                     sbi->s_flags & SF_SETMODE) {
 102                         if (inode->i_mode & S_IRUSR)
 103                                 inode->i_mode |= S_IXUSR;
 104                         if (inode->i_mode & S_IRGRP)
 105                                 inode->i_mode |= S_IXGRP;
 106                         if (inode->i_mode & S_IROTH)
 107                                 inode->i_mode |= S_IXOTH;
 108                         inode->i_mode |= S_IFDIR;
 109                 } else
 110                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 111                 if (tail->link_chain)
 112                         inode->i_nlink = 2;
 113                 /* Maybe it should be controlled by mount parameter? */
 114                 //inode->i_mode |= S_ISVTX;
 115                 inode->i_op = &affs_dir_inode_operations;
 116                 inode->i_fop = &affs_dir_operations;
 117                 break;
 118         case ST_LINKDIR:
 119 #if 0
 120                 affs_warning(sb, "read_inode", "inode is LINKDIR");
 121                 goto bad_inode;
 122 #else
 123                 inode->i_mode |= S_IFDIR;
 124                 inode->i_op = NULL;
 125                 inode->i_fop = NULL;
 126                 break;
 127 #endif
 128         case ST_LINKFILE:
 129                 affs_warning(sb, "read_inode", "inode is LINKFILE");
 130                 goto bad_inode;
 131         case ST_FILE:
 132                 size = be32_to_cpu(tail->size);
 133                 inode->i_mode |= S_IFREG;
 134                 AFFS_I(inode)->mmu_private = inode->i_size = size;
 135                 if (inode->i_size) {
 136                         AFFS_I(inode)->i_blkcnt = (size - 1) /
 137                                                sbi->s_data_blksize + 1;
 138                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 139                                                sbi->s_hashsize + 1;
 140                 }
 141                 if (tail->link_chain)
 142                         inode->i_nlink = 2;
 143                 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
 144                 inode->i_op = &affs_file_inode_operations;
 145                 inode->i_fop = &affs_file_operations;
 146                 break;
 147         case ST_SOFTLINK:
 148                 inode->i_mode |= S_IFLNK;
 149                 inode->i_op = &affs_symlink_inode_operations;
 150                 inode->i_data.a_ops = &affs_symlink_aops;
 151                 break;
 152         }
 153
 154         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 155                        = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 156                          be32_to_cpu(tail->change.mins) * 60 +
 157                          be32_to_cpu(tail->change.ticks) / 50 +
 158                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 159                          sys_tz.tz_minuteswest * 60;
 160         inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 161         affs_brelse(bh);
 162         unlock_new_inode(inode);
 163         return inode;
 164
 165 bad_inode:
 166         affs_brelse(bh);
 167         iget_failed(inode);
 168         return ERR_PTR(-EIO);
 169 }
 170
 171 int
 172 affs_write_inode(struct inode *inode, int unused)
 173 {
 174         struct super_block      *sb = inode->i_sb;
 175         struct buffer_head      *bh;
 176         struct affs_tail        *tail;
 177         uid_t                    uid;
 178         gid_t                    gid;
 179
 180         pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 181
 182         if (!inode->i_nlink)
 183                 // possibly free block
 184                 return 0;
 185         bh = affs_bread(sb, inode->i_ino);
 186         if (!bh) {
 187                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 188                 return -EIO;
 189         }
 190         tail = AFFS_TAIL(sb, bh);
 191         if (tail->stype == cpu_to_be32(ST_ROOT)) {
 192                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 193         } else {
 194                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 195                 tail->size = cpu_to_be32(inode->i_size);
 196                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 197                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 198                         uid = inode->i_uid;
 199                         gid = inode->i_gid;
 200                         if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 201                                 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 202                                         uid = inode->i_uid ^ ~0;
 203                                 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 204                                         gid = inode->i_gid ^ ~0;
 205                         }
 206                         if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 207                                 tail->uid = cpu_to_be16(uid);
 208                         if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 209                                 tail->gid = cpu_to_be16(gid);
 210                 }
 211         }
 212         affs_fix_checksum(sb, bh);
 213         mark_buffer_dirty_inode(bh, inode);
 214         affs_brelse(bh);
 215         affs_free_prealloc(inode);
 216         return 0;
 217 }
 218
 219 int
 220 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 221 {
 222         struct inode *inode = dentry->d_inode;
 223         int error;
 224
 225         pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 226
 227         error = inode_change_ok(inode,attr);
 228         if (error)
 229                 goto out;
 230
 231         if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 232             ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 233             ((attr->ia_valid & ATTR_MODE) &&
 234              (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 235                 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 236                         error = -EPERM;
 237                 goto out;
 238         }
 239
 240         error = inode_setattr(inode, attr);
 241         if (!error && (attr->ia_valid & ATTR_MODE))
 242                 mode_to_prot(inode);
 243 out:
 244         return error;
 245 }
 246
 247 void
 248 affs_put_inode(struct inode *inode)
 249 {
 250         pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 251         affs_free_prealloc(inode);
 252 }
 253
 254 void
 255 affs_drop_inode(struct inode *inode)
 256 {
 257         mutex_lock(&inode->i_mutex);
 258         if (inode->i_size != AFFS_I(inode)->mmu_private)
 259                 affs_truncate(inode);
 260         mutex_unlock(&inode->i_mutex);
 261
 262         generic_drop_inode(inode);
 263 }
 264
 265 void
 266 affs_delete_inode(struct inode *inode)
 267 {
 268         pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 269         truncate_inode_pages(&inode->i_data, 0);
 270         inode->i_size = 0;
 271         if (S_ISREG(inode->i_mode))
 272                 affs_truncate(inode);
 273         clear_inode(inode);
 274         affs_free_block(inode->i_sb, inode->i_ino);
 275 }
 276
 277 void
 278 affs_clear_inode(struct inode *inode)
 279 {
 280         unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
 281
 282         pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 283         if (cache_page) {
 284                 pr_debug("AFFS: freeing ext cache\n");
 285                 AFFS_I(inode)->i_lc = NULL;
 286                 AFFS_I(inode)->i_ac = NULL;
 287                 free_page(cache_page);
 288         }
 289         affs_brelse(AFFS_I(inode)->i_ext_bh);
 290         AFFS_I(inode)->i_ext_last = ~1;
 291         AFFS_I(inode)->i_ext_bh = NULL;
 292 }
 293
 294 struct inode *
 295 affs_new_inode(struct inode *dir)
 296 {
 297         struct super_block      *sb = dir->i_sb;
 298         struct inode            *inode;
 299         u32                      block;
 300         struct buffer_head      *bh;
 301
 302         if (!(inode = new_inode(sb)))
 303                 goto err_inode;
 304
 305         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 306                 goto err_block;
 307
 308         bh = affs_getzeroblk(sb, block);
 309         if (!bh)
 310                 goto err_bh;
 311         mark_buffer_dirty_inode(bh, inode);
 312         affs_brelse(bh);
 313
 314         inode->i_uid     = current->fsuid;
 315         inode->i_gid     = current->fsgid;
 316         inode->i_ino     = block;
 317         inode->i_nlink   = 1;
 318         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 319         AFFS_I(inode)->i_opencnt = 0;
 320         AFFS_I(inode)->i_blkcnt = 0;
 321         AFFS_I(inode)->i_lc = NULL;
 322         AFFS_I(inode)->i_lc_size = 0;
 323         AFFS_I(inode)->i_lc_shift = 0;
 324         AFFS_I(inode)->i_lc_mask = 0;
 325         AFFS_I(inode)->i_ac = NULL;
 326         AFFS_I(inode)->i_ext_bh = NULL;
 327         AFFS_I(inode)->mmu_private = 0;
 328         AFFS_I(inode)->i_protect = 0;
 329         AFFS_I(inode)->i_lastalloc = 0;
 330         AFFS_I(inode)->i_pa_cnt = 0;
 331         AFFS_I(inode)->i_extcnt = 1;
 332         AFFS_I(inode)->i_ext_last = ~1;
 333
 334         insert_inode_hash(inode);
 335
 336         return inode;
 337
 338 err_bh:
 339         affs_free_block(sb, block);
 340 err_block:
 341         iput(inode);
 342 err_inode:
 343         return NULL;
 344 }
 345
 346 /*
 347  * Add an entry to a directory. Create the header block
 348  * and insert it into the hash table.
 349  */
 350
 351 int
 352 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 353 {
 354         struct super_block *sb = dir->i_sb;
 355         struct buffer_head *inode_bh = NULL;
 356         struct buffer_head *bh = NULL;
 357         u32 block = 0;
 358         int retval;
 359
 360         pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
 361                  (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
 362
 363         retval = -EIO;
 364         bh = affs_bread(sb, inode->i_ino);
 365         if (!bh)
 366                 goto done;
 367
 368         affs_lock_link(inode);
 369         switch (type) {
 370         case ST_LINKFILE:
 371         case ST_LINKDIR:
 372                 inode_bh = bh;
 373                 retval = -ENOSPC;
 374                 block = affs_alloc_block(dir, dir->i_ino);
 375                 if (!block)
 376                         goto err;
 377                 retval = -EIO;
 378                 bh = affs_getzeroblk(sb, block);
 379                 if (!bh)
 380                         goto err;
 381                 break;
 382         default:
 383                 break;
 384         }
 385
 386         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 387         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 388         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 389         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 390         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 391
 392         if (inode_bh) {
 393                 __be32 chain;
 394                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 395                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 396                 AFFS_TAIL(sb, bh)->link_chain = chain;
 397                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 398                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 399                 mark_buffer_dirty_inode(inode_bh, inode);
 400                 inode->i_nlink = 2;
 401                 atomic_inc(&inode->i_count);
 402         }
 403         affs_fix_checksum(sb, bh);
 404         mark_buffer_dirty_inode(bh, inode);
 405         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 406
 407         affs_lock_dir(dir);
 408         retval = affs_insert_hash(dir, bh);
 409         mark_buffer_dirty_inode(bh, inode);
 410         affs_unlock_dir(dir);
 411         affs_unlock_link(inode);
 412
 413         d_instantiate(dentry, inode);
 414 done:
 415         affs_brelse(inode_bh);
 416         affs_brelse(bh);
 417         return retval;
 418 err:
 419         if (block)
 420                 affs_free_block(sb, block);
 421         affs_unlock_link(inode);
 422         goto done;
 423 }