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