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