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
  13 #include <asm/div64.h>
  14 #include <linux/errno.h>
  15 #include <linux/fs.h>
  16 #include <linux/slab.h>
  17 #include <linux/stat.h>
  18 #include <linux/time.h>
  19 #include <linux/affs_fs.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/string.h>
  23 #include <linux/genhd.h>
  24 #include <linux/amigaffs.h>
  25 #include <linux/major.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/init.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/buffer_head.h>
  30 #include <asm/system.h>
  31 #include <asm/uaccess.h>
  32 #include <linux/module.h>
  33
  34 extern struct inode_operations affs_symlink_inode_operations;
  35 extern struct timezone sys_tz;
  36
  37 void
  38 affs_read_inode(struct inode *inode)
  39 {
  40         struct super_block      *sb = inode->i_sb;
  41         struct affs_sb_info     *sbi = AFFS_SB(sb);
  42         struct buffer_head      *bh;
  43         struct affs_head        *head;
  44         struct affs_tail        *tail;
  45         u32                      block;
  46         u32                      size;
  47         u32                      prot;
  48         u16                      id;
  49
  50         pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
  51
  52         block = inode->i_ino;
  53         bh = affs_bread(sb, block);
  54         if (!bh) {
  55                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  56                 goto bad_inode;
  57         }
  58         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  59                 affs_warning(sb,"read_inode",
  60                            "Checksum or type (ptype=%d) error on inode %d",
  61                            AFFS_HEAD(bh)->ptype, block);
  62                 goto bad_inode;
  63         }
  64
  65         head = AFFS_HEAD(bh);
  66         tail = AFFS_TAIL(sb, bh);
  67         prot = be32_to_cpu(tail->protect);
  68
  69         inode->i_size = 0;
  70         inode->i_nlink = 1;
  71         inode->i_mode = 0;
  72         AFFS_I(inode)->i_extcnt = 1;
  73         AFFS_I(inode)->i_ext_last = ~1;
  74         AFFS_I(inode)->i_protect = prot;
  75         AFFS_I(inode)->i_opencnt = 0;
  76         AFFS_I(inode)->i_blkcnt = 0;
  77         AFFS_I(inode)->i_lc = NULL;
  78         AFFS_I(inode)->i_lc_size = 0;
  79         AFFS_I(inode)->i_lc_shift = 0;
  80         AFFS_I(inode)->i_lc_mask = 0;
  81         AFFS_I(inode)->i_ac = NULL;
  82         AFFS_I(inode)->i_ext_bh = NULL;
  83         AFFS_I(inode)->mmu_private = 0;
  84         AFFS_I(inode)->i_lastalloc = 0;
  85         AFFS_I(inode)->i_pa_cnt = 0;
  86
  87         if (sbi->s_flags & SF_SETMODE)
  88                 inode->i_mode = sbi->s_mode;
  89         else
  90                 inode->i_mode = prot_to_mode(prot);
  91
  92         id = be16_to_cpu(tail->uid);
  93         if (id == 0 || sbi->s_flags & SF_SETUID)
  94                 inode->i_uid = sbi->s_uid;
  95         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  96                 inode->i_uid = 0;
  97         else
  98                 inode->i_uid = id;
  99
 100         id = be16_to_cpu(tail->gid);
 101         if (id == 0 || sbi->s_flags & SF_SETGID)
 102                 inode->i_gid = sbi->s_gid;
 103         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
 104                 inode->i_gid = 0;
 105         else
 106                 inode->i_gid = id;
 107
 108         switch (be32_to_cpu(tail->stype)) {
 109         case ST_ROOT:
 110                 inode->i_uid = sbi->s_uid;
 111                 inode->i_gid = sbi->s_gid;
 112                 /* fall through */
 113         case ST_USERDIR:
 114                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
 115                     sbi->s_flags & SF_SETMODE) {
 116                         if (inode->i_mode & S_IRUSR)
 117                                 inode->i_mode |= S_IXUSR;
 118                         if (inode->i_mode & S_IRGRP)
 119                                 inode->i_mode |= S_IXGRP;
 120                         if (inode->i_mode & S_IROTH)
 121                                 inode->i_mode |= S_IXOTH;
 122                         inode->i_mode |= S_IFDIR;
 123                 } else
 124                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 125                 if (tail->link_chain)
 126                         inode->i_nlink = 2;
 127                 /* Maybe it should be controlled by mount parameter? */
 128                 //inode->i_mode |= S_ISVTX;
 129                 inode->i_op = &affs_dir_inode_operations;
 130                 inode->i_fop = &affs_dir_operations;
 131                 break;
 132         case ST_LINKDIR:
 133 #if 0
 134                 affs_warning(sb, "read_inode", "inode is LINKDIR");
 135                 goto bad_inode;
 136 #else
 137                 inode->i_mode |= S_IFDIR;
 138                 inode->i_op = NULL;
 139                 inode->i_fop = NULL;
 140                 break;
 141 #endif
 142         case ST_LINKFILE:
 143                 affs_warning(sb, "read_inode", "inode is LINKFILE");
 144                 goto bad_inode;
 145         case ST_FILE:
 146                 size = be32_to_cpu(tail->size);
 147                 inode->i_mode |= S_IFREG;
 148                 AFFS_I(inode)->mmu_private = inode->i_size = size;
 149                 if (inode->i_size) {
 150                         AFFS_I(inode)->i_blkcnt = (size - 1) /
 151                                                sbi->s_data_blksize + 1;
 152                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 153                                                sbi->s_hashsize + 1;
 154                 }
 155                 if (tail->link_chain)
 156                         inode->i_nlink = 2;
 157                 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
 158                 inode->i_op = &affs_file_inode_operations;
 159                 inode->i_fop = &affs_file_operations;
 160                 break;
 161         case ST_SOFTLINK:
 162                 inode->i_mode |= S_IFLNK;
 163                 inode->i_op = &affs_symlink_inode_operations;
 164                 inode->i_data.a_ops = &affs_symlink_aops;
 165                 break;
 166         }
 167
 168         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 169                        = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 170                          be32_to_cpu(tail->change.mins) * 60 +
 171                          be32_to_cpu(tail->change.ticks) / 50 +
 172                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 173                          sys_tz.tz_minuteswest * 60;
 174         inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 175         affs_brelse(bh);
 176         return;
 177
 178 bad_inode:
 179         make_bad_inode(inode);
 180         affs_brelse(bh);
 181         return;
 182 }
 183
 184 void
 185 affs_write_inode(struct inode *inode, int unused)
 186 {
 187         struct super_block      *sb = inode->i_sb;
 188         struct buffer_head      *bh;
 189         struct affs_tail        *tail;
 190         uid_t                    uid;
 191         gid_t                    gid;
 192
 193         pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 194
 195         if (!inode->i_nlink)
 196                 // possibly free block
 197                 return;
 198         bh = affs_bread(sb, inode->i_ino);
 199         if (!bh) {
 200                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 201                 return;
 202         }
 203         tail = AFFS_TAIL(sb, bh);
 204         if (tail->stype == be32_to_cpu(ST_ROOT)) {
 205                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 206         } else {
 207                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 208                 tail->size = cpu_to_be32(inode->i_size);
 209                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 210                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 211                         uid = inode->i_uid;
 212                         gid = inode->i_gid;
 213                         if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 214                                 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 215                                         uid = inode->i_uid ^ ~0;
 216                                 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 217                                         gid = inode->i_gid ^ ~0;
 218                         }
 219                         if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 220                                 tail->uid = cpu_to_be16(uid);
 221                         if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 222                                 tail->gid = cpu_to_be16(gid);
 223                 }
 224         }
 225         affs_fix_checksum(sb, bh);
 226         mark_buffer_dirty_inode(bh, inode);
 227         affs_brelse(bh);
 228         affs_free_prealloc(inode);
 229 }
 230
 231 int
 232 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 233 {
 234         struct inode *inode = dentry->d_inode;
 235         int error;
 236
 237         pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 238
 239         error = inode_change_ok(inode,attr);
 240         if (error)
 241                 goto out;
 242
 243         if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 244             ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 245             ((attr->ia_valid & ATTR_MODE) &&
 246              (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 247                 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 248                         error = -EPERM;
 249                 goto out;
 250         }
 251
 252         inode_setattr(inode, attr);
 253         if (!error && (attr->ia_valid & ATTR_MODE))
 254                 mode_to_prot(inode);
 255 out:
 256         return error;
 257 }
 258
 259 void
 260 affs_put_inode(struct inode *inode)
 261 {
 262         pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 263         affs_free_prealloc(inode);
 264         if (atomic_read(&inode->i_count) == 1) {
 265                 down(&inode->i_sem);
 266                 if (inode->i_size != AFFS_I(inode)->mmu_private)
 267                         affs_truncate(inode);
 268                 up(&inode->i_sem);
 269         }
 270 }
 271
 272 void
 273 affs_delete_inode(struct inode *inode)
 274 {
 275         pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 276         inode->i_size = 0;
 277         if (S_ISREG(inode->i_mode))
 278                 affs_truncate(inode);
 279         clear_inode(inode);
 280         affs_free_block(inode->i_sb, inode->i_ino);
 281 }
 282
 283 void
 284 affs_clear_inode(struct inode *inode)
 285 {
 286         unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
 287
 288         pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 289         if (cache_page) {
 290                 pr_debug("AFFS: freeing ext cache\n");
 291                 AFFS_I(inode)->i_lc = NULL;
 292                 AFFS_I(inode)->i_ac = NULL;
 293                 free_page(cache_page);
 294         }
 295         affs_brelse(AFFS_I(inode)->i_ext_bh);
 296         AFFS_I(inode)->i_ext_last = ~1;
 297         AFFS_I(inode)->i_ext_bh = NULL;
 298 }
 299
 300 struct inode *
 301 affs_new_inode(struct inode *dir)
 302 {
 303         struct super_block      *sb = dir->i_sb;
 304         struct inode            *inode;
 305         u32                      block;
 306         struct buffer_head      *bh;
 307
 308         if (!(inode = new_inode(sb)))
 309                 goto err_inode;
 310
 311         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 312                 goto err_block;
 313
 314         bh = affs_getzeroblk(sb, block);
 315         if (!bh)
 316                 goto err_bh;
 317         mark_buffer_dirty_inode(bh, inode);
 318         affs_brelse(bh);
 319
 320         inode->i_uid     = current->fsuid;
 321         inode->i_gid     = current->fsgid;
 322         inode->i_ino     = block;
 323         inode->i_nlink   = 1;
 324         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 325         AFFS_I(inode)->i_opencnt = 0;
 326         AFFS_I(inode)->i_blkcnt = 0;
 327         AFFS_I(inode)->i_lc = NULL;
 328         AFFS_I(inode)->i_lc_size = 0;
 329         AFFS_I(inode)->i_lc_shift = 0;
 330         AFFS_I(inode)->i_lc_mask = 0;
 331         AFFS_I(inode)->i_ac = NULL;
 332         AFFS_I(inode)->i_ext_bh = NULL;
 333         AFFS_I(inode)->mmu_private = 0;
 334         AFFS_I(inode)->i_protect = 0;
 335         AFFS_I(inode)->i_lastalloc = 0;
 336         AFFS_I(inode)->i_pa_cnt = 0;
 337         AFFS_I(inode)->i_extcnt = 1;
 338         AFFS_I(inode)->i_ext_last = ~1;
 339
 340         insert_inode_hash(inode);
 341
 342         return inode;
 343
 344 err_bh:
 345         affs_free_block(sb, block);
 346 err_block:
 347         iput(inode);
 348 err_inode:
 349         return NULL;
 350 }
 351
 352 /*
 353  * Add an entry to a directory. Create the header block
 354  * and insert it into the hash table.
 355  */
 356
 357 int
 358 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 359 {
 360         struct super_block *sb = dir->i_sb;
 361         struct buffer_head *inode_bh = NULL;
 362         struct buffer_head *bh = NULL;
 363         u32 block = 0;
 364         int retval;
 365
 366         pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
 367                  (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
 368
 369         retval = -EIO;
 370         bh = affs_bread(sb, inode->i_ino);
 371         if (!bh)
 372                 goto done;
 373
 374         affs_lock_link(inode);
 375         switch (type) {
 376         case ST_LINKFILE:
 377         case ST_LINKDIR:
 378                 inode_bh = bh;
 379                 retval = -ENOSPC;
 380                 block = affs_alloc_block(dir, dir->i_ino);
 381                 if (!block)
 382                         goto err;
 383                 retval = -EIO;
 384                 bh = affs_getzeroblk(sb, block);
 385                 if (!bh)
 386                         goto err;
 387                 break;
 388         default:
 389                 break;
 390         }
 391
 392         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 393         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 394         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 395         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 396         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 397
 398         if (inode_bh) {
 399                 u32 chain;
 400                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 401                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 402                 AFFS_TAIL(sb, bh)->link_chain = chain;
 403                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 404                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 405                 mark_buffer_dirty_inode(inode_bh, inode);
 406                 inode->i_nlink = 2;
 407                 atomic_inc(&inode->i_count);
 408         }
 409         affs_fix_checksum(sb, bh);
 410         mark_buffer_dirty_inode(bh, inode);
 411         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 412
 413         affs_lock_dir(dir);
 414         retval = affs_insert_hash(dir, bh);
 415         mark_buffer_dirty_inode(bh, inode);
 416         affs_unlock_dir(dir);
 417         affs_unlock_link(inode);
 418
 419         d_instantiate(dentry, inode);
 420 done:
 421         affs_brelse(inode_bh);
 422         affs_brelse(bh);
 423         return retval;
 424 err:
 425         if (block)
 426                 affs_free_block(sb, block);
 427         affs_unlock_link(inode);
 428         goto done;
 429 }
 430 MODULE_LICENSE("GPL");