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 (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 || sbi->s_flags & SF_SETUID)
  76                 inode->i_uid = sbi->s_uid;
  77         else if (id == 0xFFFF && 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 || sbi->s_flags & SF_SETGID)
  84                 inode->i_gid = sbi->s_gid;
  85         else if (id == 0xFFFF && 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                     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 = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
 137                 inode->i_op = &affs_file_inode_operations;
 138                 inode->i_fop = &affs_file_operations;
 139                 break;
 140         case ST_SOFTLINK:
 141                 inode->i_mode |= S_IFLNK;
 142                 inode->i_op = &affs_symlink_inode_operations;
 143                 inode->i_data.a_ops = &affs_symlink_aops;
 144                 break;
 145         }
 146
 147         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 148                        = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 149                          be32_to_cpu(tail->change.mins) * 60 +
 150                          be32_to_cpu(tail->change.ticks) / 50 +
 151                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 152                          sys_tz.tz_minuteswest * 60;
 153         inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 154         affs_brelse(bh);
 155         unlock_new_inode(inode);
 156         return inode;
 157
 158 bad_inode:
 159         affs_brelse(bh);
 160         iget_failed(inode);
 161         return ERR_PTR(-EIO);
 162 }
 163
 164 int
 165 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 166 {
 167         struct super_block      *sb = inode->i_sb;
 168         struct buffer_head      *bh;
 169         struct affs_tail        *tail;
 170         uid_t                    uid;
 171         gid_t                    gid;
 172
 173         pr_debug("write_inode(%lu)\n", inode->i_ino);
 174
 175         if (!inode->i_nlink)
 176                 // possibly free block
 177                 return 0;
 178         bh = affs_bread(sb, inode->i_ino);
 179         if (!bh) {
 180                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 181                 return -EIO;
 182         }
 183         tail = AFFS_TAIL(sb, bh);
 184         if (tail->stype == cpu_to_be32(ST_ROOT)) {
 185                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 186         } else {
 187                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 188                 tail->size = cpu_to_be32(inode->i_size);
 189                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 190                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 191                         uid = i_uid_read(inode);
 192                         gid = i_gid_read(inode);
 193                         if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 194                                 if (uid == 0 || uid == 0xFFFF)
 195                                         uid = uid ^ ~0;
 196                                 if (gid == 0 || gid == 0xFFFF)
 197                                         gid = gid ^ ~0;
 198                         }
 199                         if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 200                                 tail->uid = cpu_to_be16(uid);
 201                         if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 202                                 tail->gid = cpu_to_be16(gid);
 203                 }
 204         }
 205         affs_fix_checksum(sb, bh);
 206         mark_buffer_dirty_inode(bh, inode);
 207         affs_brelse(bh);
 208         affs_free_prealloc(inode);
 209         return 0;
 210 }
 211
 212 int
 213 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 214 {
 215         struct inode *inode = dentry->d_inode;
 216         int error;
 217
 218         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
 219
 220         error = inode_change_ok(inode,attr);
 221         if (error)
 222                 goto out;
 223
 224         if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 225             ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 226             ((attr->ia_valid & ATTR_MODE) &&
 227              (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 228                 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 229                         error = -EPERM;
 230                 goto out;
 231         }
 232
 233         if ((attr->ia_valid & ATTR_SIZE) &&
 234             attr->ia_size != i_size_read(inode)) {
 235                 error = inode_newsize_ok(inode, attr->ia_size);
 236                 if (error)
 237                         return error;
 238
 239                 truncate_setsize(inode, attr->ia_size);
 240                 affs_truncate(inode);
 241         }
 242
 243         setattr_copy(inode, attr);
 244         mark_inode_dirty(inode);
 245
 246         if (attr->ia_valid & ATTR_MODE)
 247                 mode_to_prot(inode);
 248 out:
 249         return error;
 250 }
 251
 252 void
 253 affs_evict_inode(struct inode *inode)
 254 {
 255         unsigned long cache_page;
 256         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
 257                  inode->i_ino, inode->i_nlink);
 258         truncate_inode_pages_final(&inode->i_data);
 259
 260         if (!inode->i_nlink) {
 261                 inode->i_size = 0;
 262                 affs_truncate(inode);
 263         }
 264
 265         invalidate_inode_buffers(inode);
 266         clear_inode(inode);
 267         affs_free_prealloc(inode);
 268         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 269         if (cache_page) {
 270                 pr_debug("freeing ext cache\n");
 271                 AFFS_I(inode)->i_lc = NULL;
 272                 AFFS_I(inode)->i_ac = NULL;
 273                 free_page(cache_page);
 274         }
 275         affs_brelse(AFFS_I(inode)->i_ext_bh);
 276         AFFS_I(inode)->i_ext_last = ~1;
 277         AFFS_I(inode)->i_ext_bh = NULL;
 278
 279         if (!inode->i_nlink)
 280                 affs_free_block(inode->i_sb, inode->i_ino);
 281 }
 282
 283 struct inode *
 284 affs_new_inode(struct inode *dir)
 285 {
 286         struct super_block      *sb = dir->i_sb;
 287         struct inode            *inode;
 288         u32                      block;
 289         struct buffer_head      *bh;
 290
 291         if (!(inode = new_inode(sb)))
 292                 goto err_inode;
 293
 294         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 295                 goto err_block;
 296
 297         bh = affs_getzeroblk(sb, block);
 298         if (!bh)
 299                 goto err_bh;
 300         mark_buffer_dirty_inode(bh, inode);
 301         affs_brelse(bh);
 302
 303         inode->i_uid     = current_fsuid();
 304         inode->i_gid     = current_fsgid();
 305         inode->i_ino     = block;
 306         set_nlink(inode, 1);
 307         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 308         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 309         AFFS_I(inode)->i_blkcnt = 0;
 310         AFFS_I(inode)->i_lc = NULL;
 311         AFFS_I(inode)->i_lc_size = 0;
 312         AFFS_I(inode)->i_lc_shift = 0;
 313         AFFS_I(inode)->i_lc_mask = 0;
 314         AFFS_I(inode)->i_ac = NULL;
 315         AFFS_I(inode)->i_ext_bh = NULL;
 316         AFFS_I(inode)->mmu_private = 0;
 317         AFFS_I(inode)->i_protect = 0;
 318         AFFS_I(inode)->i_lastalloc = 0;
 319         AFFS_I(inode)->i_pa_cnt = 0;
 320         AFFS_I(inode)->i_extcnt = 1;
 321         AFFS_I(inode)->i_ext_last = ~1;
 322
 323         insert_inode_hash(inode);
 324
 325         return inode;
 326
 327 err_bh:
 328         affs_free_block(sb, block);
 329 err_block:
 330         iput(inode);
 331 err_inode:
 332         return NULL;
 333 }
 334
 335 /*
 336  * Add an entry to a directory. Create the header block
 337  * and insert it into the hash table.
 338  */
 339
 340 int
 341 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 342 {
 343         struct super_block *sb = dir->i_sb;
 344         struct buffer_head *inode_bh = NULL;
 345         struct buffer_head *bh = NULL;
 346         u32 block = 0;
 347         int retval;
 348
 349         pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
 350                  dir->i_ino, inode->i_ino, dentry, type);
 351
 352         retval = -EIO;
 353         bh = affs_bread(sb, inode->i_ino);
 354         if (!bh)
 355                 goto done;
 356
 357         affs_lock_link(inode);
 358         switch (type) {
 359         case ST_LINKFILE:
 360         case ST_LINKDIR:
 361                 retval = -ENOSPC;
 362                 block = affs_alloc_block(dir, dir->i_ino);
 363                 if (!block)
 364                         goto err;
 365                 retval = -EIO;
 366                 inode_bh = bh;
 367                 bh = affs_getzeroblk(sb, block);
 368                 if (!bh)
 369                         goto err;
 370                 break;
 371         default:
 372                 break;
 373         }
 374
 375         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 376         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 377         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 378         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 379         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 380
 381         if (inode_bh) {
 382                 __be32 chain;
 383                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 384                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 385                 AFFS_TAIL(sb, bh)->link_chain = chain;
 386                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 387                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 388                 mark_buffer_dirty_inode(inode_bh, inode);
 389                 set_nlink(inode, 2);
 390                 ihold(inode);
 391         }
 392         affs_fix_checksum(sb, bh);
 393         mark_buffer_dirty_inode(bh, inode);
 394         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 395
 396         affs_lock_dir(dir);
 397         retval = affs_insert_hash(dir, bh);
 398         mark_buffer_dirty_inode(bh, inode);
 399         affs_unlock_dir(dir);
 400         affs_unlock_link(inode);
 401
 402         d_instantiate(dentry, inode);
 403 done:
 404         affs_brelse(inode_bh);
 405         affs_brelse(bh);
 406         return retval;
 407 err:
 408         if (block)
 409                 affs_free_block(sb, block);
 410         affs_unlock_link(inode);
 411         goto done;
 412 }