fs/hpfs/inode.c

   1 /*
   2  *  linux/fs/hpfs/inode.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  inode VFS functions
   7  */
   8
   9 #include "hpfs_fn.h"
  10
  11 static const struct file_operations hpfs_file_ops =
  12 {
  13         NULL,                           /* lseek - default */
  14         hpfs_file_read,                 /* read */
  15         hpfs_file_write,                /* write */
  16         NULL,                           /* readdir - bad */
  17         NULL,                           /* poll - default */
  18         NULL,                           /* ioctl - default */
  19         generic_file_mmap/*hpfs_mmap*/, /* mmap */
  20         hpfs_open,                      /* open */
  21         NULL,                           /* flush */
  22         hpfs_file_release,              /* release */
  23         hpfs_file_fsync,                /* fsync */
  24         NULL,                           /* fasync */
  25         NULL,                           /* check_media_change */
  26         NULL,                           /* revalidate */
  27         NULL,                           /* lock */
  28 };
  29
  30 static const struct inode_operations hpfs_file_iops =
  31 {
  32         (nonconst *) & hpfs_file_ops,   /* default file operations */
  33         NULL,                           /* create */
  34         NULL,                           /* lookup */
  35         NULL,                           /* link */
  36         NULL,                           /* unlink */
  37         NULL,                           /* symlink */
  38         NULL,                           /* mkdir */
  39         NULL,                           /* rmdir */
  40         NULL,                           /* mknod */
  41         NULL,                           /* rename */
  42         NULL,                           /* readlink */
  43         NULL,                           /* follow_link */
  44         generic_readpage,               /* readpage */
  45         NULL,                           /* writepage */
  46         (int (*)(struct inode *, int))
  47         &hpfs_bmap,                     /* bmap */
  48         &hpfs_truncate,                 /* truncate */
  49         NULL,                           /* permission */
  50         NULL,                           /* smap */
  51         NULL,                           /* updatepage */
  52         NULL,                           /* revalidate */
  53 };
  54
  55 static const struct file_operations hpfs_dir_ops =
  56 {
  57         NULL,                           /* lseek - default */
  58         hpfs_dir_read,                  /* read */
  59         NULL,                           /* write - bad */
  60         hpfs_readdir,                   /* readdir */
  61         NULL,                           /* poll - default */
  62         NULL,                           /* ioctl - default */
  63         NULL,                           /* mmap */
  64         hpfs_open,                      /* open */
  65         NULL,                           /* flush */
  66         hpfs_dir_release,               /* no special release code */
  67         hpfs_file_fsync,                /* fsync */
  68         NULL,                           /* fasync */
  69         NULL,                           /* check_media_change */
  70         NULL,                           /* revalidate */
  71         NULL,                           /* lock */
  72 };
  73
  74 static const struct inode_operations hpfs_dir_iops =
  75 {
  76         (nonconst *) & hpfs_dir_ops,    /* default directory file ops */
  77         hpfs_create,                    /* create */
  78         hpfs_lookup,                    /* lookup */
  79         NULL,                           /* link */
  80         hpfs_unlink,                    /* unlink */
  81         hpfs_symlink,                   /* symlink */
  82         hpfs_mkdir,                     /* mkdir */
  83         hpfs_rmdir,                     /* rmdir */
  84         hpfs_mknod,                     /* mknod */
  85         hpfs_rename,                    /* rename */
  86         NULL,                           /* readlink */
  87         NULL,                           /* follow_link */
  88         NULL,                           /* readpage */
  89         NULL,                           /* writepage */
  90         NULL,                           /* bmap */
  91         NULL,                           /* truncate */
  92         NULL,                           /* permission */
  93         NULL,                           /* smap */
  94         NULL,                           /* updatepage */
  95         NULL,                           /* revalidate */
  96 };
  97
  98 const struct inode_operations hpfs_symlink_iops =
  99 {
 100         NULL,                           /* default file operations */
 101         NULL,                           /* create */
 102         NULL,                           /* lookup */
 103         NULL,                           /* link */
 104         NULL,                           /* unlink */
 105         NULL,                           /* symlink */
 106         NULL,                           /* mkdir */
 107         NULL,                           /* rmdir */
 108         NULL,                           /* mknod */
 109         NULL,                           /* rename */
 110         hpfs_readlink,                  /* readlink */
 111         hpfs_follow_link,               /* follow_link */
 112         NULL,                           /* readpage */
 113         NULL,                           /* writepage */
 114         NULL,                           /* bmap */
 115         NULL,                           /* truncate */
 116         NULL,                           /* permission */
 117         NULL,                           /* smap */
 118         NULL,                           /* updatepage */
 119         NULL,                           /* revalidate */
 120 };
 121
 122
 123 void hpfs_read_inode(struct inode *i)
 124 {
 125         struct buffer_head *bh;
 126         struct fnode *fnode;
 127         struct super_block *sb = i->i_sb;
 128         unsigned char *ea;
 129         int ea_size;
 130         i->i_op = 0;
 131         /*i->i_hpfs_sem = MUTEX;*/
 132         init_MUTEX(&i->i_hpfs_sem);
 133         i->i_uid = sb->s_hpfs_uid;
 134         i->i_gid = sb->s_hpfs_gid;
 135         i->i_mode = sb->s_hpfs_mode;
 136         i->i_hpfs_conv = sb->s_hpfs_conv;
 137         i->i_blksize = 512;
 138         i->i_size = -1;
 139         i->i_blocks = -1;
 140
 141         i->i_hpfs_dno = 0;
 142         i->i_hpfs_n_secs = 0;
 143         i->i_hpfs_file_sec = 0;
 144         i->i_hpfs_disk_sec = 0;
 145         i->i_hpfs_dpos = 0;
 146         i->i_hpfs_dsubdno = 0;
 147         i->i_hpfs_ea_mode = 0;
 148         i->i_hpfs_ea_uid = 0;
 149         i->i_hpfs_ea_gid = 0;
 150         i->i_hpfs_ea_size = 0;
 151         i->i_version = ++event;
 152
 153         i->i_hpfs_rddir_off = NULL;
 154         i->i_hpfs_dirty = 0;
 155
 156         i->i_atime = 0;
 157         i->i_mtime = 0;
 158         i->i_ctime = 0;
 159
 160         if (!i->i_sb->s_hpfs_rd_inode)
 161                 hpfs_error(i->i_sb, "read_inode: s_hpfs_rd_inode == 0");
 162         if (i->i_sb->s_hpfs_rd_inode == 2) {
 163                 i->i_mode |= S_IFREG;
 164                 i->i_mode &= ~0111;
 165                 i->i_op = (struct inode_operations *) &hpfs_file_iops;
 166                 i->i_nlink = 1;
 167                 return;
 168         }
 169         if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
 170                 /*i->i_mode |= S_IFREG;
 171                 i->i_mode &= ~0111;
 172                 i->i_op = (struct inode_operations *) &hpfs_file_iops;
 173                 i->i_nlink = 0;*/
 174                 make_bad_inode(i);
 175                 return;
 176         }
 177         if (i->i_sb->s_hpfs_eas) {
 178                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
 179                         if (ea_size == 2) {
 180                                 i->i_uid = ea[0] + (ea[1] << 8);
 181                                 i->i_hpfs_ea_uid = 1;
 182                         }
 183                         kfree(ea);
 184                 }
 185                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
 186                         if (ea_size == 2) {
 187                                 i->i_gid = ea[0] + (ea[1] << 8);
 188                                 i->i_hpfs_ea_gid = 1;
 189                         }
 190                         kfree(ea);
 191                 }
 192                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
 193                         kfree(ea);
 194                         i->i_mode = S_IFLNK | 0777;
 195                         i->i_op = (struct inode_operations *) &hpfs_symlink_iops;
 196                         i->i_nlink = 1;
 197                         i->i_size = ea_size;
 198                         i->i_blocks = 1;
 199                         brelse(bh);
 200                         return;
 201                 }
 202                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
 203                         int rdev = 0;
 204                         umode_t mode = sb->s_hpfs_mode;
 205                         if (ea_size == 2) {
 206                                 mode = ea[0] + (ea[1] << 8);
 207                                 i->i_hpfs_ea_mode = 1;
 208                         }
 209                         kfree(ea);
 210                         i->i_mode = mode;
 211                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 212                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
 213                                         if (ea_size == 4)
 214                                                 rdev = ea[0] + (ea[1] << 8) + (ea[2] << 16) + (ea[3] << 24);
 215                                         kfree(ea);
 216                                 }
 217                         }
 218                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 219                                 brelse(bh);
 220                                 i->i_nlink = 1;
 221                                 i->i_size = 0;
 222                                 i->i_blocks = 1;
 223                                 init_special_inode(i, mode, rdev);
 224                                 return;
 225                         }
 226                 }
 227         }
 228         if (fnode->dirflag) {
 229                 unsigned n_dnodes, n_subdirs;
 230                 i->i_mode |= S_IFDIR;
 231                 i->i_op = (struct inode_operations *) &hpfs_dir_iops;
 232                 i->i_hpfs_parent_dir = fnode->up;
 233                 i->i_hpfs_dno = fnode->u.external[0].disk_secno;
 234                 if (sb->s_hpfs_chk >= 2) {
 235                         struct buffer_head *bh0;
 236                         if (hpfs_map_fnode(sb, i->i_hpfs_parent_dir, &bh0)) brelse(bh0);
 237                 }
 238                 n_dnodes = 0; n_subdirs = 0;
 239                 hpfs_count_dnodes(i->i_sb, i->i_hpfs_dno, &n_dnodes, &n_subdirs, NULL);
 240                 i->i_blocks = 4 * n_dnodes;
 241                 i->i_size = 2048 * n_dnodes;
 242                 i->i_nlink = 2 + n_subdirs;
 243         } else {
 244                 i->i_mode |= S_IFREG;
 245                 if (!i->i_hpfs_ea_mode) i->i_mode &= ~0111;
 246                 i->i_op = (struct inode_operations *) &hpfs_file_iops;
 247                 i->i_nlink = 1;
 248                 i->i_size = fnode->file_size;
 249                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 250         }
 251         brelse(bh);
 252 }
 253
 254 void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 255 {
 256         if (fnode->acl_size_l || fnode->acl_size_s) {
 257                 /* Some unknown structures like ACL may be in fnode,
 258                    we'd better not overwrite them */
 259                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 260         } else if (i->i_sb->s_hpfs_eas >= 2) {
 261                 unsigned char ea[4];
 262                 if ((i->i_uid != i->i_sb->s_hpfs_uid) || i->i_hpfs_ea_uid) {
 263                         ea[0] = i->i_uid & 0xff;
 264                         ea[1] = i->i_uid >> 8;
 265                         hpfs_set_ea(i, fnode, "UID", ea, 2);
 266                         i->i_hpfs_ea_uid = 1;
 267                 }
 268                 if ((i->i_gid != i->i_sb->s_hpfs_gid) || i->i_hpfs_ea_gid) {
 269                         ea[0] = i->i_gid & 0xff;
 270                         ea[1] = i->i_gid >> 8;
 271                         hpfs_set_ea(i, fnode, "GID", ea, 2);
 272                         i->i_hpfs_ea_gid = 1;
 273                 }
 274                 if (!S_ISLNK(i->i_mode))
 275                         if ((i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 276                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 277                           && i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 278                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || i->i_hpfs_ea_mode) {
 279                                 ea[0] = i->i_mode & 0xff;
 280                                 ea[1] = i->i_mode >> 8;
 281                                 hpfs_set_ea(i, fnode, "MODE", ea, 2);
 282                                 i->i_hpfs_ea_mode = 1;
 283                         }
 284                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 285                         int d = kdev_t_to_nr(i->i_rdev);
 286                         ea[0] = d & 0xff;
 287                         ea[1] = (d >> 8) & 0xff;
 288                         ea[2] = (d >> 16) & 0xff;
 289                         ea[3] = d >> 24;
 290                         hpfs_set_ea(i, fnode, "DEV", ea, 4);
 291                 }
 292         }
 293 }
 294
 295 void hpfs_write_inode(struct inode *i)
 296 {
 297         struct inode *parent;
 298         if (!i->i_nlink) return;
 299         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 300         if (i->i_hpfs_rddir_off && !i->i_count) {
 301                 if (*i->i_hpfs_rddir_off) printk("HPFS: write_inode: some position still there\n");
 302                 kfree(i->i_hpfs_rddir_off);
 303                 i->i_hpfs_rddir_off = NULL;
 304         }
 305         i->i_hpfs_dirty = 0;
 306         hpfs_lock_iget(i->i_sb, 1);
 307         parent = iget(i->i_sb, i->i_hpfs_parent_dir);
 308         hpfs_unlock_iget(i->i_sb);
 309         hpfs_lock_inode(parent);
 310         hpfs_write_inode_nolock(i);
 311         hpfs_unlock_inode(parent);
 312         iput(parent);
 313 }
 314
 315 void hpfs_write_inode_nolock(struct inode *i)
 316 {
 317         struct buffer_head *bh;
 318         struct fnode *fnode;
 319         struct quad_buffer_head qbh;
 320         struct hpfs_dirent *de;
 321         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 322         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 323         if (i->i_ino != i->i_sb->s_hpfs_root) {
 324                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 325                         brelse(bh);
 326                         return;
 327                 }
 328         } else de = NULL;
 329         if (S_ISREG(i->i_mode)) {
 330                 fnode->file_size = de->file_size = i->i_size;
 331         } else if (S_ISDIR(i->i_mode)) {
 332                 fnode->file_size = de->file_size = 0;
 333         }
 334         hpfs_write_inode_ea(i, fnode);
 335         if (de) {
 336                 de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 337                 de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 338                 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 339                 de->read_only = !(i->i_mode & 0222);
 340                 de->ea_size = i->i_hpfs_ea_size;
 341                 hpfs_mark_4buffers_dirty(&qbh);
 342                 hpfs_brelse4(&qbh);
 343         }
 344         if (S_ISDIR(i->i_mode)) {
 345                 if ((de = map_dirent(i, i->i_hpfs_dno, "\001\001", 2, NULL, &qbh))) {
 346                         de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 347                         de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 348                         de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 349                         de->read_only = !(i->i_mode & 0222);
 350                         de->ea_size = /*i->i_hpfs_ea_size*/0;
 351                         de->file_size = 0;
 352                         hpfs_mark_4buffers_dirty(&qbh);
 353                         hpfs_brelse4(&qbh);
 354                 } else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
 355         }
 356         mark_buffer_dirty(bh, 1);
 357         brelse(bh);
 358 }
 359
 360 int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
 361 {
 362         struct inode *inode = dentry->d_inode;
 363         int error;
 364         if (inode->i_sb->s_hpfs_root == inode->i_ino) return -EINVAL;
 365         if ((error = inode_change_ok(inode, attr))) return error;
 366         inode_setattr(inode, attr);
 367         hpfs_write_inode(inode);
 368         return 0;
 369 }
 370
 371 void hpfs_write_if_changed(struct inode *inode)
 372 {
 373         if (inode->i_hpfs_dirty) {
 374                 hpfs_write_inode(inode);
 375         }
 376 }
 377
 378 void hpfs_delete_inode(struct inode *inode)
 379 {
 380         hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 381 }