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
  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_tail        *tail;
  23         struct inode            *inode;
  24         u32                      block;
  25         u32                      size;
  26         u32                      prot;
  27         u16                      id;
  28
  29         inode = iget_locked(sb, ino);
  30         if (!inode)
  31                 return ERR_PTR(-ENOMEM);
  32         if (!(inode->i_state & I_NEW))
  33                 return inode;
  34
  35         pr_debug("affs_iget(%lu)\n", inode->i_ino);
  36
  37         block = inode->i_ino;
  38         bh = affs_bread(sb, block);
  39         if (!bh) {
  40                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
  41                 goto bad_inode;
  42         }
  43         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  44                 affs_warning(sb,"read_inode",
  45                            "Checksum or type (ptype=%d) error on inode %d",
  46                            AFFS_HEAD(bh)->ptype, block);
  47                 goto bad_inode;
  48         }
  49
  50         tail = AFFS_TAIL(sb, bh);
  51         prot = be32_to_cpu(tail->protect);
  52
  53         inode->i_size = 0;
  54         set_nlink(inode, 1);
  55         inode->i_mode = 0;
  56         AFFS_I(inode)->i_extcnt = 1;
  57         AFFS_I(inode)->i_ext_last = ~1;
  58         AFFS_I(inode)->i_protect = prot;
  59         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
  60         AFFS_I(inode)->i_blkcnt = 0;
  61         AFFS_I(inode)->i_lc = NULL;
  62         AFFS_I(inode)->i_lc_size = 0;
  63         AFFS_I(inode)->i_lc_shift = 0;
  64         AFFS_I(inode)->i_lc_mask = 0;
  65         AFFS_I(inode)->i_ac = NULL;
  66         AFFS_I(inode)->i_ext_bh = NULL;
  67         AFFS_I(inode)->mmu_private = 0;
  68         AFFS_I(inode)->i_lastalloc = 0;
  69         AFFS_I(inode)->i_pa_cnt = 0;
  70
  71         if (sbi->s_flags & SF_SETMODE)
  72                 inode->i_mode = sbi->s_mode;
  73         else
  74                 inode->i_mode = prot_to_mode(prot);
  75
  76         id = be16_to_cpu(tail->uid);
  77         if (id == 0 || sbi->s_flags & SF_SETUID)
  78                 inode->i_uid = sbi->s_uid;
  79         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  80                 i_uid_write(inode, 0);
  81         else
  82                 i_uid_write(inode, id);
  83
  84         id = be16_to_cpu(tail->gid);
  85         if (id == 0 || sbi->s_flags & SF_SETGID)
  86                 inode->i_gid = sbi->s_gid;
  87         else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  88                 i_gid_write(inode, 0);
  89         else
  90                 i_gid_write(inode, id);
  91
  92         switch (be32_to_cpu(tail->stype)) {
  93         case ST_ROOT:
  94                 inode->i_uid = sbi->s_uid;
  95                 inode->i_gid = sbi->s_gid;
  96                 /* fall through */
  97         case ST_USERDIR:
  98                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
  99                     sbi->s_flags & SF_SETMODE) {
 100                         if (inode->i_mode & S_IRUSR)
 101                                 inode->i_mode |= S_IXUSR;
 102                         if (inode->i_mode & S_IRGRP)
 103                                 inode->i_mode |= S_IXGRP;
 104                         if (inode->i_mode & S_IROTH)
 105                                 inode->i_mode |= S_IXOTH;
 106                         inode->i_mode |= S_IFDIR;
 107                 } else
 108                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 109                 /* Maybe it should be controlled by mount parameter? */
 110                 //inode->i_mode |= S_ISVTX;
 111                 inode->i_op = &affs_dir_inode_operations;
 112                 inode->i_fop = &affs_dir_operations;
 113                 break;
 114         case ST_LINKDIR:
 115 #if 0
 116                 affs_warning(sb, "read_inode", "inode is LINKDIR");
 117                 goto bad_inode;
 118 #else
 119                 inode->i_mode |= S_IFDIR;
 120                 /* ... and leave ->i_op and ->i_fop pointing to empty */
 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                         set_nlink(inode, 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         unlock_new_inode(inode);
 158         return inode;
 159
 160 bad_inode:
 161         affs_brelse(bh);
 162         iget_failed(inode);
 163         return ERR_PTR(-EIO);
 164 }
 165
 166 int
 167 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 168 {
 169         struct super_block      *sb = inode->i_sb;
 170         struct buffer_head      *bh;
 171         struct affs_tail        *tail;
 172         uid_t                    uid;
 173         gid_t                    gid;
 174
 175         pr_debug("write_inode(%lu)\n", inode->i_ino);
 176
 177         if (!inode->i_nlink)
 178                 // possibly free block
 179                 return 0;
 180         bh = affs_bread(sb, inode->i_ino);
 181         if (!bh) {
 182                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 183                 return -EIO;
 184         }
 185         tail = AFFS_TAIL(sb, bh);
 186         if (tail->stype == cpu_to_be32(ST_ROOT)) {
 187                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 188         } else {
 189                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 190                 tail->size = cpu_to_be32(inode->i_size);
 191                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 192                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 193                         uid = i_uid_read(inode);
 194                         gid = i_gid_read(inode);
 195                         if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 196                                 if (uid == 0 || uid == 0xFFFF)
 197                                         uid = uid ^ ~0;
 198                                 if (gid == 0 || gid == 0xFFFF)
 199                                         gid = gid ^ ~0;
 200                         }
 201                         if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 202                                 tail->uid = cpu_to_be16(uid);
 203                         if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 204                                 tail->gid = cpu_to_be16(gid);
 205                 }
 206         }
 207         affs_fix_checksum(sb, bh);
 208         mark_buffer_dirty_inode(bh, inode);
 209         affs_brelse(bh);
 210         affs_free_prealloc(inode);
 211         return 0;
 212 }
 213
 214 int
 215 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 216 {
 217         struct inode *inode = dentry->d_inode;
 218         int error;
 219
 220         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
 221
 222         error = inode_change_ok(inode,attr);
 223         if (error)
 224                 goto out;
 225
 226         if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 227             ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 228             ((attr->ia_valid & ATTR_MODE) &&
 229              (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 230                 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 231                         error = -EPERM;
 232                 goto out;
 233         }
 234
 235         if ((attr->ia_valid & ATTR_SIZE) &&
 236             attr->ia_size != i_size_read(inode)) {
 237                 error = inode_newsize_ok(inode, attr->ia_size);
 238                 if (error)
 239                         return error;
 240
 241                 truncate_setsize(inode, attr->ia_size);
 242                 affs_truncate(inode);
 243         }
 244
 245         setattr_copy(inode, attr);
 246         mark_inode_dirty(inode);
 247
 248         if (attr->ia_valid & ATTR_MODE)
 249                 mode_to_prot(inode);
 250 out:
 251         return error;
 252 }
 253
 254 void
 255 affs_evict_inode(struct inode *inode)
 256 {
 257         unsigned long cache_page;
 258         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
 259                  inode->i_ino, inode->i_nlink);
 260         truncate_inode_pages_final(&inode->i_data);
 261
 262         if (!inode->i_nlink) {
 263                 inode->i_size = 0;
 264                 affs_truncate(inode);
 265         }
 266
 267         invalidate_inode_buffers(inode);
 268         clear_inode(inode);
 269         affs_free_prealloc(inode);
 270         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 271         if (cache_page) {
 272                 pr_debug("freeing ext cache\n");
 273                 AFFS_I(inode)->i_lc = NULL;
 274                 AFFS_I(inode)->i_ac = NULL;
 275                 free_page(cache_page);
 276         }
 277         affs_brelse(AFFS_I(inode)->i_ext_bh);
 278         AFFS_I(inode)->i_ext_last = ~1;
 279         AFFS_I(inode)->i_ext_bh = NULL;
 280
 281         if (!inode->i_nlink)
 282                 affs_free_block(inode->i_sb, inode->i_ino);
 283 }
 284
 285 struct inode *
 286 affs_new_inode(struct inode *dir)
 287 {
 288         struct super_block      *sb = dir->i_sb;
 289         struct inode            *inode;
 290         u32                      block;
 291         struct buffer_head      *bh;
 292
 293         if (!(inode = new_inode(sb)))
 294                 goto err_inode;
 295
 296         if (!(block = affs_alloc_block(dir, dir->i_ino)))
 297                 goto err_block;
 298
 299         bh = affs_getzeroblk(sb, block);
 300         if (!bh)
 301                 goto err_bh;
 302         mark_buffer_dirty_inode(bh, inode);
 303         affs_brelse(bh);
 304
 305         inode->i_uid     = current_fsuid();
 306         inode->i_gid     = current_fsgid();
 307         inode->i_ino     = block;
 308         set_nlink(inode, 1);
 309         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 310         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 311         AFFS_I(inode)->i_blkcnt = 0;
 312         AFFS_I(inode)->i_lc = NULL;
 313         AFFS_I(inode)->i_lc_size = 0;
 314         AFFS_I(inode)->i_lc_shift = 0;
 315         AFFS_I(inode)->i_lc_mask = 0;
 316         AFFS_I(inode)->i_ac = NULL;
 317         AFFS_I(inode)->i_ext_bh = NULL;
 318         AFFS_I(inode)->mmu_private = 0;
 319         AFFS_I(inode)->i_protect = 0;
 320         AFFS_I(inode)->i_lastalloc = 0;
 321         AFFS_I(inode)->i_pa_cnt = 0;
 322         AFFS_I(inode)->i_extcnt = 1;
 323         AFFS_I(inode)->i_ext_last = ~1;
 324
 325         insert_inode_hash(inode);
 326
 327         return inode;
 328
 329 err_bh:
 330         affs_free_block(sb, block);
 331 err_block:
 332         iput(inode);
 333 err_inode:
 334         return NULL;
 335 }
 336
 337 /*
 338  * Add an entry to a directory. Create the header block
 339  * and insert it into the hash table.
 340  */
 341
 342 int
 343 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 344 {
 345         struct super_block *sb = dir->i_sb;
 346         struct buffer_head *inode_bh = NULL;
 347         struct buffer_head *bh = NULL;
 348         u32 block = 0;
 349         int retval;
 350
 351         pr_debug("%s(dir=%u, inode=%u, \"%*s\", type=%d)\n",
 352                  __func__, (u32)dir->i_ino,
 353                  (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
 354
 355         retval = -EIO;
 356         bh = affs_bread(sb, inode->i_ino);
 357         if (!bh)
 358                 goto done;
 359
 360         affs_lock_link(inode);
 361         switch (type) {
 362         case ST_LINKFILE:
 363         case ST_LINKDIR:
 364                 retval = -ENOSPC;
 365                 block = affs_alloc_block(dir, dir->i_ino);
 366                 if (!block)
 367                         goto err;
 368                 retval = -EIO;
 369                 inode_bh = bh;
 370                 bh = affs_getzeroblk(sb, block);
 371                 if (!bh)
 372                         goto err;
 373                 break;
 374         default:
 375                 break;
 376         }
 377
 378         AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 379         AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 380         affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 381         AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 382         AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 383
 384         if (inode_bh) {
 385                 __be32 chain;
 386                 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 387                 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 388                 AFFS_TAIL(sb, bh)->link_chain = chain;
 389                 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 390                 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 391                 mark_buffer_dirty_inode(inode_bh, inode);
 392                 set_nlink(inode, 2);
 393                 ihold(inode);
 394         }
 395         affs_fix_checksum(sb, bh);
 396         mark_buffer_dirty_inode(bh, inode);
 397         dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 398
 399         affs_lock_dir(dir);
 400         retval = affs_insert_hash(dir, bh);
 401         mark_buffer_dirty_inode(bh, inode);
 402         affs_unlock_dir(dir);
 403         affs_unlock_link(inode);
 404
 405         d_instantiate(dentry, inode);
 406 done:
 407         affs_brelse(inode_bh);
 408         affs_brelse(bh);
 409         return retval;
 410 err:
 411         if (block)
 412                 affs_free_block(sb, block);
 413         affs_unlock_link(inode);
 414         goto done;
 415 }