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