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
  13 #define DEBUG 0
  14 #include <linux/errno.h>
  15 #include <linux/fs.h>
  16 #include <linux/malloc.h>
  17 #include <linux/stat.h>
  18 #include <linux/sched.h>
  19 #include <linux/affs_fs.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/string.h>
  23 #include <linux/locks.h>
  24 #include <linux/genhd.h>
  25 #include <linux/amigaffs.h>
  26 #include <linux/major.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/init.h>
  29 #include <asm/system.h>
  30 #include <asm/uaccess.h>
  31
  32 extern int *blk_size[];
  33 extern struct timezone sys_tz;
  34 extern struct inode_operations affs_symlink_inode_operations;
  35
  36 #define MIN(a,b) (((a)<(b))?(a):(b))
  37
  38 unsigned long
  39 affs_parent_ino(struct inode *dir)
  40 {
  41         int root_ino = (dir->i_sb->u.affs_sb.s_root_block);
  42
  43         if (!S_ISDIR(dir->i_mode)) {
  44                 affs_error(dir->i_sb,"parent_ino","Trying to get parent of non-directory");
  45                 return root_ino;
  46         }
  47         if (dir->i_ino == root_ino)
  48                 return root_ino;
  49         return dir->u.affs_i.i_parent;
  50 }
  51
  52 void
  53 affs_read_inode(struct inode *inode)
  54 {
  55         struct buffer_head      *bh;
  56         struct file_front       *file_front;
  57         struct file_end         *file_end;
  58         s32                      block;
  59         unsigned long            prot;
  60         s32                      ptype, stype;
  61         unsigned short           id;
  62
  63         pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
  64
  65         block = inode->i_ino;
  66         if (!(bh = affs_bread(inode->i_dev,block,AFFS_I2BSIZE(inode)))) {
  67                 affs_error(inode->i_sb,"read_inode","Cannot read block %d",block);
  68                 return;
  69         }
  70         if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&ptype,&stype) || ptype != T_SHORT) {
  71                 affs_error(inode->i_sb,"read_inode",
  72                            "Checksum or type (ptype=%d) error on inode %d",ptype,block);
  73                 affs_brelse(bh);
  74                 return;
  75         }
  76
  77         file_front = (struct file_front *)bh->b_data;
  78         file_end   = GET_END_PTR(struct file_end, bh->b_data,AFFS_I2BSIZE(inode));
  79         prot       = (be32_to_cpu(file_end->protect) & ~0x10) ^ FIBF_OWNER;
  80
  81         inode->u.affs_i.i_protect      = prot;
  82         inode->u.affs_i.i_parent       = be32_to_cpu(file_end->parent);
  83         inode->u.affs_i.i_original     = 0;
  84         inode->u.affs_i.i_zone         = 0;
  85         inode->u.affs_i.i_hlink        = 0;
  86         inode->u.affs_i.i_pa_cnt       = 0;
  87         inode->u.affs_i.i_pa_next      = 0;
  88         inode->u.affs_i.i_pa_last      = 0;
  89         inode->u.affs_i.i_ec           = NULL;
  90         inode->u.affs_i.i_lastblock    = -1;
  91         inode->i_nlink                 = 1;
  92         inode->i_mode                  = 0;
  93
  94         if (inode->i_sb->u.affs_sb.s_flags & SF_SETMODE)
  95                 inode->i_mode = inode->i_sb->u.affs_sb.s_mode;
  96         else
  97                 inode->i_mode = prot_to_mode(prot);
  98
  99         if (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
 100                 inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
 101         id = be16_to_cpu(file_end->owner_uid);
 102         if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
 103                 inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
 104         else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
 105                 inode->i_uid = 0;
 106         else
 107                 inode->i_uid = id;
 108
 109         id = be16_to_cpu(file_end->owner_gid);
 110         if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETGID)
 111                 inode->i_gid = inode->i_sb->u.affs_sb.s_gid;
 112         else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
 113                 inode->i_gid = 0;
 114         else
 115                 inode->i_gid = id;
 116
 117         switch (be32_to_cpu(file_end->secondary_type)) {
 118                 case ST_ROOT:
 119                         inode->i_uid   = inode->i_sb->u.affs_sb.s_uid;
 120                         inode->i_gid   = inode->i_sb->u.affs_sb.s_gid;
 121                 case ST_USERDIR:
 122                         if (be32_to_cpu(file_end->secondary_type) == ST_USERDIR ||
 123                             inode->i_sb->u.affs_sb.s_flags & SF_SETMODE) {
 124                                 if (inode->i_mode & S_IRUSR)
 125                                         inode->i_mode |= S_IXUSR;
 126                                 if (inode->i_mode & S_IRGRP)
 127                                         inode->i_mode |= S_IXGRP;
 128                                 if (inode->i_mode & S_IROTH)
 129                                         inode->i_mode |= S_IXOTH;
 130                                 inode->i_mode |= S_IFDIR;
 131                         } else
 132                                 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 133                         inode->i_size  = 0;
 134                         break;
 135                 case ST_LINKDIR:
 136                         affs_error(inode->i_sb,"read_inode","inode is LINKDIR");
 137                         affs_brelse(bh);
 138                         return;
 139                 case ST_LINKFILE:
 140                         affs_error(inode->i_sb,"read_inode","inode is LINKFILE");
 141                         affs_brelse(bh);
 142                         return;
 143                 case ST_FILE:
 144                         inode->i_mode |= S_IFREG;
 145                         inode->i_size  = be32_to_cpu(file_end->byte_size);
 146                         if (inode->i_sb->u.affs_sb.s_flags & SF_OFS)
 147                                 block = AFFS_I2BSIZE(inode) - 24;
 148                         else
 149                                 block = AFFS_I2BSIZE(inode);
 150                         inode->u.affs_i.i_lastblock = ((inode->i_size + block - 1) / block) - 1;
 151                         break;
 152                 case ST_SOFTLINK:
 153                         inode->i_mode |= S_IFLNK;
 154                         inode->i_size  = 0;
 155                         break;
 156         }
 157
 158         inode->i_mtime = inode->i_atime = inode->i_ctime
 159                        = (be32_to_cpu(file_end->created.ds_Days) * (24 * 60 * 60) +
 160                          be32_to_cpu(file_end->created.ds_Minute) * 60 +
 161                          be32_to_cpu(file_end->created.ds_Tick) / 50 +
 162                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 163                          sys_tz.tz_minuteswest * 60;
 164         affs_brelse(bh);
 165
 166         if (S_ISREG(inode->i_mode)) {
 167                 if (inode->i_sb->u.affs_sb.s_flags & SF_OFS) {
 168                         inode->i_op = &affs_file_inode_operations;
 169                         inode->i_fop = &affs_file_operations_ofs;
 170                         return;
 171                 }
 172                 inode->i_op = &affs_file_inode_operations;
 173                 inode->i_fop = &affs_file_operations;
 174                 inode->i_mapping->a_ops = &affs_aops;
 175                 inode->u.affs_i.mmu_private = inode->i_size;
 176         } else if (S_ISDIR(inode->i_mode)) {
 177                 /* Maybe it should be controlled by mount parameter? */
 178                 inode->i_mode |= S_ISVTX;
 179                 inode->i_op = &affs_dir_inode_operations;
 180                 inode->i_fop = &affs_dir_operations;
 181         }
 182         else if (S_ISLNK(inode->i_mode)) {
 183                 inode->i_op = &affs_symlink_inode_operations;
 184                 inode->i_data.a_ops = &affs_symlink_aops;
 185         }
 186 }
 187
 188 void
 189 affs_write_inode(struct inode *inode)
 190 {
 191         struct buffer_head      *bh;
 192         struct file_end         *file_end;
 193         uid_t                    uid;
 194         gid_t                    gid;
 195
 196         pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 197
 198         if (!inode->i_nlink)
 199                 return;
 200         if (!(bh = bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode)))) {
 201                 affs_error(inode->i_sb,"write_inode","Cannot read block %lu",inode->i_ino);
 202                 return;
 203         }
 204         file_end = GET_END_PTR(struct file_end, bh->b_data,AFFS_I2BSIZE(inode));
 205         if (file_end->secondary_type == be32_to_cpu(ST_ROOT)) {
 206                 secs_to_datestamp(inode->i_mtime,&ROOT_END(bh->b_data,inode)->disk_altered);
 207         } else {
 208                 file_end->protect   = cpu_to_be32(inode->u.affs_i.i_protect ^ FIBF_OWNER);
 209                 file_end->byte_size = cpu_to_be32(inode->i_size);
 210                 secs_to_datestamp(inode->i_mtime,&file_end->created);
 211                 if (!(inode->i_ino == inode->i_sb->u.affs_sb.s_root_block)) {
 212                         uid = inode->i_uid;
 213                         gid = inode->i_gid;
 214                         if (inode->i_sb->u.affs_sb.s_flags & SF_MUFS) {
 215                                 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 216                                         uid = inode->i_uid ^ ~0;
 217                                 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 218                                         gid = inode->i_gid ^ ~0;
 219                         }
 220                         if (!(inode->i_sb->u.affs_sb.s_flags & SF_SETUID))
 221                                 file_end->owner_uid = cpu_to_be16(uid);
 222                         if (!(inode->i_sb->u.affs_sb.s_flags & SF_SETGID))
 223                                 file_end->owner_gid = cpu_to_be16(gid);
 224                 }
 225         }
 226         affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
 227         mark_buffer_dirty(bh,1);
 228         brelse(bh);
 229 }
 230
 231 int
 232 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 233 {
 234         struct inode *inode = dentry->d_inode;
 235         int error;
 236
 237         pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 238
 239         error = inode_change_ok(inode,attr);
 240         if (error)
 241                 goto out;
 242
 243         if (((attr->ia_valid & ATTR_UID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)) ||
 244             ((attr->ia_valid & ATTR_GID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETGID)) ||
 245             ((attr->ia_valid & ATTR_MODE) &&
 246              (inode->i_sb->u.affs_sb.s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 247                 if (!(inode->i_sb->u.affs_sb.s_flags & SF_QUIET))
 248                         error = -EPERM;
 249                 goto out;
 250         }
 251
 252         if (attr->ia_valid & ATTR_MODE)
 253                 inode->u.affs_i.i_protect = mode_to_prot(attr->ia_mode);
 254
 255         error = 0;
 256         inode_setattr(inode, attr);
 257 out:
 258         return error;
 259 }
 260
 261 void
 262 affs_put_inode(struct inode *inode)
 263 {
 264         pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n",
 265                 inode->i_ino,inode->i_nlink);
 266
 267         affs_free_prealloc(inode);
 268         if (inode->i_count == 1) {
 269                 unsigned long cache_page = (unsigned long) inode->u.affs_i.i_ec;
 270                 if (cache_page) {
 271                         pr_debug("AFFS: freeing ext cache\n");
 272                         inode->u.affs_i.i_ec = NULL;
 273                         free_page(cache_page);
 274                 }
 275         }
 276 }
 277
 278 void
 279 affs_delete_inode(struct inode *inode)
 280 {
 281         pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n",inode->i_ino,inode->i_nlink);
 282         inode->i_size = 0;
 283         if (S_ISREG(inode->i_mode) && !inode->u.affs_i.i_hlink)
 284                 affs_truncate(inode);
 285         affs_free_block(inode->i_sb,inode->i_ino);
 286         clear_inode(inode);
 287 }
 288
 289 struct inode *
 290 affs_new_inode(const struct inode *dir)
 291 {
 292         struct inode            *inode;
 293         struct super_block      *sb;
 294         s32                      block;
 295
 296         if (!dir || !(inode = get_empty_inode()))
 297                 return NULL;
 298
 299         sb = dir->i_sb;
 300         inode->i_sb    = sb;
 301
 302         if (!(block = affs_new_header((struct inode *)dir))) {
 303                 iput(inode);
 304                 return NULL;
 305         }
 306
 307         inode->i_dev     = sb->s_dev;
 308         inode->i_uid     = current->fsuid;
 309         inode->i_gid     = current->fsgid;
 310         inode->i_ino     = block;
 311         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 312
 313         inode->u.affs_i.i_original  = 0;
 314         inode->u.affs_i.i_parent    = dir->i_ino;
 315         inode->u.affs_i.i_zone      = 0;
 316         inode->u.affs_i.i_hlink     = 0;
 317         inode->u.affs_i.i_pa_cnt    = 0;
 318         inode->u.affs_i.i_pa_next   = 0;
 319         inode->u.affs_i.i_pa_last   = 0;
 320         inode->u.affs_i.i_ec        = NULL;
 321         inode->u.affs_i.i_lastblock = -1;
 322
 323         insert_inode_hash(inode);
 324         mark_inode_dirty(inode);
 325
 326         return inode;
 327 }
 328
 329 /*
 330  * Add an entry to a directory. Create the header block
 331  * and insert it into the hash table.
 332  */
 333
 334 int
 335 affs_add_entry(struct inode *dir, struct inode *link, struct inode *inode,
 336                struct dentry *dentry, int type)
 337 {
 338         struct buffer_head      *dir_bh;
 339         struct buffer_head      *inode_bh;
 340         struct buffer_head      *link_bh;
 341         int                      retval;
 342         const unsigned char     *name = dentry->d_name.name;
 343         int                      len  = dentry->d_name.len;
 344
 345         pr_debug("AFFS: add_entry(dir=%lu,inode=%lu,\"%*s\",type=%d)\n",dir->i_ino,inode->i_ino,
 346                  len,name,type);
 347
 348         if ((retval = affs_check_name(name,len)))
 349                 return retval;
 350         if (len > 30)
 351                 len = 30;
 352
 353         dir_bh   = affs_bread(dir->i_dev,dir->i_ino,AFFS_I2BSIZE(dir));
 354         inode_bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
 355         link_bh  = NULL;
 356         retval   = -EIO;
 357         if (!dir_bh || !inode_bh)
 358                 goto addentry_done;
 359         if (link) {
 360                 link_bh = affs_bread(link->i_dev,link->i_ino,AFFS_I2BSIZE(link));
 361                 if (!link_bh)
 362                         goto addentry_done;
 363         }
 364         ((struct dir_front *)inode_bh->b_data)->primary_type = cpu_to_be32(T_SHORT);
 365         ((struct dir_front *)inode_bh->b_data)->own_key      = cpu_to_be32(inode->i_ino);
 366         DIR_END(inode_bh->b_data,inode)->dir_name[0]         = len;
 367         strncpy(DIR_END(inode_bh->b_data,inode)->dir_name + 1,name,len);
 368         DIR_END(inode_bh->b_data,inode)->secondary_type = cpu_to_be32(type);
 369         DIR_END(inode_bh->b_data,inode)->parent         = cpu_to_be32(dir->i_ino);
 370
 371         lock_super(inode->i_sb);
 372         retval = affs_insert_hash(dir->i_ino,inode_bh,dir);
 373
 374         if (link_bh) {
 375                 LINK_END(inode_bh->b_data,inode)->original   = cpu_to_be32(link->i_ino);
 376                 LINK_END(inode_bh->b_data,inode)->link_chain =
 377                                                 FILE_END(link_bh->b_data,link)->link_chain;
 378                 FILE_END(link_bh->b_data,link)->link_chain   = cpu_to_be32(inode->i_ino);
 379                 affs_fix_checksum(AFFS_I2BSIZE(link),link_bh->b_data,5);
 380                 link->i_version = ++event;
 381                 mark_inode_dirty(link);
 382                 mark_buffer_dirty(link_bh,1);
 383         }
 384         affs_fix_checksum(AFFS_I2BSIZE(inode),inode_bh->b_data,5);
 385         affs_fix_checksum(AFFS_I2BSIZE(dir),dir_bh->b_data,5);
 386         dir->i_version = ++event;
 387         dir->i_mtime   = dir->i_atime = dir->i_ctime = CURRENT_TIME;
 388         unlock_super(inode->i_sb);
 389
 390         mark_inode_dirty(dir);
 391         mark_inode_dirty(inode);
 392         mark_buffer_dirty(dir_bh,1);
 393         mark_buffer_dirty(inode_bh,1);
 394
 395 addentry_done:
 396         affs_brelse(dir_bh);
 397         affs_brelse(inode_bh);
 398         affs_brelse(link_bh);
 399
 400         return retval;
 401 }