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/cred.h>
  14 #include <linux/gfp.h>
  15 #include "affs.h"
  16
  17 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
  18 {
  19         struct affs_sb_info     *sbi = AFFS_SB(sb);
  20         struct buffer_head      *bh;
  21         struct affs_tail        *tail;
  22         struct inode            *inode;
  23         u32                      block;
  24         u32                      size;
  25         u32                      prot;
  26         u16                      id;
  27
  28         inode = iget_locked(sb, ino);
  29         if (!inode)
  30                 return ERR_PTR(-ENOMEM);
  31         if (!(inode->i_state & I_NEW))
  32                 return inode;
  33
  34         pr_debug("affs_iget(%lu)\n", inode->i_ino);
  35
  36         block = inode->i_ino;
  37         bh = affs_bread(sb, block);
  38         if (!bh) {
  39                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  40                 goto bad_inode;
  41         }
  42         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  43                 affs_warning(sb,"read_inode",
  44                            "Checksum or type (ptype=%d) error on inode %d",
  45                            AFFS_HEAD(bh)->ptype, block);
  46                 goto bad_inode;
  47         }
  48
  49         tail = AFFS_TAIL(sb, bh);
  50         prot = be32_to_cpu(tail->protect);
  51
  52         inode->i_size = 0;
  53         set_nlink(inode, 1);
  54         inode->i_mode = 0;
  55         AFFS_I(inode)->i_extcnt = 1;
  56         AFFS_I(inode)->i_ext_last = ~1;
  57         AFFS_I(inode)->i_protect = prot;
  58         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
  59         AFFS_I(inode)->i_blkcnt = 0;
  60         AFFS_I(inode)->i_lc = NULL;
  61         AFFS_I(inode)->i_lc_size = 0;
  62         AFFS_I(inode)->i_lc_shift = 0;
  63         AFFS_I(inode)->i_lc_mask = 0;
  64         AFFS_I(inode)->i_ac = NULL;
  65         AFFS_I(inode)->i_ext_bh = NULL;
  66         AFFS_I(inode)->mmu_private = 0;
  67         AFFS_I(inode)->i_lastalloc = 0;
  68         AFFS_I(inode)->i_pa_cnt = 0;
  69
  70         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
  71                 inode->i_mode = sbi->s_mode;
  72         else
  73                 inode->i_mode = affs_prot_to_mode(prot);
  74
  75         id = be16_to_cpu(tail->uid);
  76         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
  77                 inode->i_uid = sbi->s_uid;
  78         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
  79                 i_uid_write(inode, 0);
  80         else
  81                 i_uid_write(inode, id);
  82
  83         id = be16_to_cpu(tail->gid);
  84         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
  85                 inode->i_gid = sbi->s_gid;
  86         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
  87                 i_gid_write(inode, 0);
  88         else
  89                 i_gid_write(inode, id);
  90
  91         switch (be32_to_cpu(tail->stype)) {
  92         case ST_ROOT:
  93                 inode->i_uid = sbi->s_uid;
  94                 inode->i_gid = sbi->s_gid;
  95                 /* fall through */
  96         case ST_USERDIR:
  97                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
  98                     affs_test_opt(sbi->s_flags, SF_SETMODE)) {
  99                         if (inode->i_mode & S_IRUSR)
 100                                 inode->i_mode |= S_IXUSR;
 101                         if (inode->i_mode & S_IRGRP)
 102                                 inode->i_mode |= S_IXGRP;
 103                         if (inode->i_mode & S_IROTH)
 104                                 inode->i_mode |= S_IXOTH;
 105                         inode->i_mode |= S_IFDIR;
 106                 } else
 107                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 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                 /* ... and leave ->i_op and ->i_fop pointing to empty */
 120                 break;
 121 #endif
 122         case ST_LINKFILE:
 123                 affs_warning(sb, "read_inode", "inode is LINKFILE");
 124                 goto bad_inode;
 125         case ST_FILE:
 126                 size = be32_to_cpu(tail->size);
 127                 inode->i_mode |= S_IFREG;
 128                 AFFS_I(inode)->mmu_private = inode->i_size = size;
 129                 if (inode->i_size) {
 130                         AFFS_I(inode)->i_blkcnt = (size - 1) /
 131                                                sbi->s_data_blksize + 1;
 132                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 133                                                sbi->s_hashsize + 1;
 134                 }
 135                 if (tail->link_chain)
 136                         set_nlink(inode, 2);
 137                 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
 138                                           &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_nohighmem(inode);
 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                 affs_secs_to_datestamp(inode->i_mtime.tv_sec,
 189                                        &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                 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
 194                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 195                         uid = i_uid_read(inode);
 196                         gid = i_gid_read(inode);
 197                         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
 198                                 if (uid == 0 || uid == 0xFFFF)
 199                                         uid = uid ^ ~0;
 200                                 if (gid == 0 || gid == 0xFFFF)
 201                                         gid = gid ^ ~0;
 202                         }
 203                         if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
 204                                 tail->uid = cpu_to_be16(uid);
 205                         if (!affs_test_opt(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 = d_inode(dentry);
 220         int error;
 221
 222         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
 223
 224         error = setattr_prepare(dentry, attr);
 225         if (error)
 226                 goto out;
 227
 228         if (((attr->ia_valid & ATTR_UID) &&
 229               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
 230             ((attr->ia_valid & ATTR_GID) &&
 231               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
 232             ((attr->ia_valid & ATTR_MODE) &&
 233              (AFFS_SB(inode->i_sb)->s_flags &
 234               (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
 235                 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
 236                         error = -EPERM;
 237                 goto out;
 238         }
 239
 240         if ((attr->ia_valid & ATTR_SIZE) &&
 241             attr->ia_size != i_size_read(inode)) {
 242                 error = inode_newsize_ok(inode, attr->ia_size);
 243                 if (error)
 244                         return error;
 245
 246                 truncate_setsize(inode, attr->ia_size);
 247                 affs_truncate(inode);
 248         }
 249
 250         setattr_copy(inode, attr);
 251         mark_inode_dirty(inode);
 252
 253         if (attr->ia_valid & ATTR_MODE)
 254                 affs_mode_to_prot(inode);
 255 out:
 256         return error;
 257 }
 258
 259 void
 260 affs_evict_inode(struct inode *inode)
 261 {
 262         unsigned long cache_page;
 263         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
 264                  inode->i_ino, inode->i_nlink);
 265         truncate_inode_pages_final(&inode->i_data);
 266
 267         if (!inode->i_nlink) {
 268                 inode->i_size = 0;
 269                 affs_truncate(inode);
 270         }
 271
 272         invalidate_inode_buffers(inode);
 273         clear_inode(inode);
 274         affs_free_prealloc(inode);
 275         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 276         if (cache_page) {
 277                 pr_debug("freeing ext cache\n");
 278                 AFFS_I(inode)->i_lc = NULL;
 279                 AFFS_I(inode)->i_ac = NULL;
 280                 free_page(cache_page);
 281         }
 282         affs_brelse(AFFS_I(inode)->i_ext_bh);
 283         AFFS_I(inode)->i_ext_last = ~1;
 284         AFFS_I(inode)->i_ext_bh = NULL;
 285
 286         if (!inode->i_nlink)
 287                 affs_free_block(inode->i_sb, inode->i_ino);
 288 }
 289
 290 struct inode *
 291 affs_new_inode(struct inode *dir)
 292 {
 293         struct super_block      *sb = dir->i_sb;
 294         struct inode            *inode;
 295         u32                      block;
 296         struct buffer_head      *bh;
 297
 298         if (!(inode = new_inode(sb)))
 299                 goto err_inode;
 300
 301         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 302                 goto err_block;
 303
 304         bh = affs_getzeroblk(sb, block);
 305         if (!bh)
 306                 goto err_bh;
 307         mark_buffer_dirty_inode(bh, inode);
 308         affs_brelse(bh);
 309
 310         inode->i_uid     = current_fsuid();
 311         inode->i_gid     = current_fsgid();
 312         inode->i_ino     = block;
 313         set_nlink(inode, 1);
 314         inode->i_mtime   = inode->i_atime = inode->i_ctime = current_time(inode);
 315         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 316         AFFS_I(inode)->i_blkcnt = 0;
 317         AFFS_I(inode)->i_lc = NULL;
 318         AFFS_I(inode)->i_lc_size = 0;
 319         AFFS_I(inode)->i_lc_shift = 0;
 320         AFFS_I(inode)->i_lc_mask = 0;
 321         AFFS_I(inode)->i_ac = NULL;
 322         AFFS_I(inode)->i_ext_bh = NULL;
 323         AFFS_I(inode)->mmu_private = 0;
 324         AFFS_I(inode)->i_protect = 0;
 325         AFFS_I(inode)->i_lastalloc = 0;
 326         AFFS_I(inode)->i_pa_cnt = 0;
 327         AFFS_I(inode)->i_extcnt = 1;
 328         AFFS_I(inode)->i_ext_last = ~1;
 329
 330         insert_inode_hash(inode);
 331
 332         return inode;
 333
 334 err_bh:
 335         affs_free_block(sb, block);
 336 err_block:
 337         iput(inode);
 338 err_inode:
 339         return NULL;
 340 }
 341
 342 /*
 343  * Add an entry to a directory. Create the header block
 344  * and insert it into the hash table.
 345  */
 346
 347 int
 348 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 349 {
 350         struct super_block *sb = dir->i_sb;
 351         struct buffer_head *inode_bh = NULL;
 352         struct buffer_head *bh;
 353         u32 block = 0;
 354         int retval;
 355
 356         pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
 357                  dir->i_ino, inode->i_ino, dentry, type);
 358
 359         retval = -EIO;
 360         bh = affs_bread(sb, inode->i_ino);
 361         if (!bh)
 362                 goto done;
 363
 364         affs_lock_link(inode);
 365         switch (type) {
 366         case ST_LINKFILE:
 367         case ST_LINKDIR:
 368                 retval = -ENOSPC;
 369                 block = affs_alloc_block(dir, dir->i_ino);
 370                 if (!block)
 371                         goto err;
 372                 retval = -EIO;
 373                 inode_bh = bh;
 374                 bh = affs_getzeroblk(sb, block);
 375                 if (!bh)
 376                         goto err;
 377                 break;
 378         default:
 379                 break;
 380         }
 381
 382         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 383         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 384         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 385         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 386         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 387
 388         if (inode_bh) {
 389                 __be32 chain;
 390                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 391                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 392                 AFFS_TAIL(sb, bh)->link_chain = chain;
 393                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 394                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 395                 mark_buffer_dirty_inode(inode_bh, inode);
 396                 set_nlink(inode, 2);
 397                 ihold(inode);
 398         }
 399         affs_fix_checksum(sb, bh);
 400         mark_buffer_dirty_inode(bh, inode);
 401         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 402
 403         affs_lock_dir(dir);
 404         retval = affs_insert_hash(dir, bh);
 405         mark_buffer_dirty_inode(bh, inode);
 406         affs_unlock_dir(dir);
 407         affs_unlock_link(inode);
 408
 409         d_instantiate(dentry, inode);
 410 done:
 411         affs_brelse(inode_bh);
 412         affs_brelse(bh);
 413         return retval;
 414 err:
 415         if (block)
 416                 affs_free_block(sb, block);
 417         affs_unlock_link(inode);
 418         goto done;
 419 }