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 <asm/div64.h>
  15 #include <linux/errno.h>
  16 #include <linux/fs.h>
  17 #include <linux/malloc.h>
  18 #include <linux/stat.h>
  19 #include <linux/sched.h>
  20 #include <linux/affs_fs.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/string.h>
  24 #include <linux/locks.h>
  25 #include <linux/genhd.h>
  26 #include <linux/amigaffs.h>
  27 #include <linux/major.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/init.h>
  30 #include <linux/smp_lock.h>
  31 #include <asm/system.h>
  32 #include <asm/uaccess.h>
  33
  34 extern int *blk_size[];
  35 extern struct timezone sys_tz;
  36 extern struct inode_operations affs_symlink_inode_operations;
  37
  38 #define MIN(a,b) (((a)<(b))?(a):(b))
  39
  40 unsigned long
  41 affs_parent_ino(struct inode *dir)
  42 {
  43         int root_ino = (dir->i_sb->u.affs_sb.s_root_block);
  44
  45         if (!S_ISDIR(dir->i_mode)) {
  46                 affs_error(dir->i_sb,"parent_ino","Trying to get parent of non-directory");
  47                 return root_ino;
  48         }
  49         if (dir->i_ino == root_ino)
  50                 return root_ino;
  51         return dir->u.affs_i.i_parent;
  52 }
  53
  54 void
  55 affs_read_inode(struct inode *inode)
  56 {
  57         struct buffer_head      *bh;
  58         struct file_front       *file_front;
  59         struct file_end         *file_end;
  60         s32                      block;
  61         unsigned long            prot;
  62         s32                      ptype, stype;
  63         unsigned short           id;
  64         loff_t          tmp;
  65
  66         pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
  67
  68         block = inode->i_ino;
  69         if (!(bh = affs_bread(inode->i_dev,block,AFFS_I2BSIZE(inode)))) {
  70                 affs_error(inode->i_sb,"read_inode","Cannot read block %d",block);
  71                 return;
  72         }
  73         if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&ptype,&stype) || ptype != T_SHORT) {
  74                 affs_error(inode->i_sb,"read_inode",
  75                            "Checksum or type (ptype=%d) error on inode %d",ptype,block);
  76                 affs_brelse(bh);
  77                 return;
  78         }
  79
  80         file_front = (struct file_front *)bh->b_data;
  81         file_end   = GET_END_PTR(struct file_end, bh->b_data,AFFS_I2BSIZE(inode));
  82         prot       = (be32_to_cpu(file_end->protect) & ~0x10) ^ FIBF_OWNER;
  83
  84         inode->u.affs_i.i_protect      = prot;
  85         inode->u.affs_i.i_parent       = be32_to_cpu(file_end->parent);
  86         inode->u.affs_i.i_original     = 0;
  87         inode->u.affs_i.i_zone         = 0;
  88         inode->u.affs_i.i_hlink        = 0;
  89         inode->u.affs_i.i_pa_cnt       = 0;
  90         inode->u.affs_i.i_pa_next      = 0;
  91         inode->u.affs_i.i_pa_last      = 0;
  92         inode->u.affs_i.i_ec           = NULL;
  93         inode->u.affs_i.i_lastblock    = -1;
  94         inode->i_nlink                 = 1;
  95         inode->i_mode                  = 0;
  96
  97         if (inode->i_sb->u.affs_sb.s_flags & SF_SETMODE)
  98                 inode->i_mode = inode->i_sb->u.affs_sb.s_mode;
  99         else
 100                 inode->i_mode = prot_to_mode(prot);
 101
 102         if (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
 103                 inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
 104         id = be16_to_cpu(file_end->owner_uid);
 105         if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
 106                 inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
 107         else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
 108                 inode->i_uid = 0;
 109         else
 110                 inode->i_uid = id;
 111
 112         id = be16_to_cpu(file_end->owner_gid);
 113         if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETGID)
 114                 inode->i_gid = inode->i_sb->u.affs_sb.s_gid;
 115         else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
 116                 inode->i_gid = 0;
 117         else
 118                 inode->i_gid = id;
 119
 120         switch (be32_to_cpu(file_end->secondary_type)) {
 121                 case ST_ROOT:
 122                         inode->i_uid   = inode->i_sb->u.affs_sb.s_uid;
 123                         inode->i_gid   = inode->i_sb->u.affs_sb.s_gid;
 124                 case ST_USERDIR:
 125                         if (be32_to_cpu(file_end->secondary_type) == ST_USERDIR ||
 126                             inode->i_sb->u.affs_sb.s_flags & SF_SETMODE) {
 127                                 if (inode->i_mode & S_IRUSR)
 128                                         inode->i_mode |= S_IXUSR;
 129                                 if (inode->i_mode & S_IRGRP)
 130                                         inode->i_mode |= S_IXGRP;
 131                                 if (inode->i_mode & S_IROTH)
 132                                         inode->i_mode |= S_IXOTH;
 133                                 inode->i_mode |= S_IFDIR;
 134                         } else
 135                                 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 136                         inode->i_size  = 0;
 137                         break;
 138                 case ST_LINKDIR:
 139                         affs_error(inode->i_sb,"read_inode","inode is LINKDIR");
 140                         affs_brelse(bh);
 141                         return;
 142                 case ST_LINKFILE:
 143                         affs_error(inode->i_sb,"read_inode","inode is LINKFILE");
 144                         affs_brelse(bh);
 145                         return;
 146                 case ST_FILE:
 147                         inode->i_mode |= S_IFREG;
 148                         inode->i_size  = be32_to_cpu(file_end->byte_size);
 149                         if (inode->i_sb->u.affs_sb.s_flags & SF_OFS)
 150                                 block = AFFS_I2BSIZE(inode) - 24;
 151                         else
 152                                 block = AFFS_I2BSIZE(inode);
 153                         tmp = inode->i_size + block -1;
 154                         do_div (tmp, block);
 155                         tmp--;
 156                         inode->u.affs_i.i_lastblock = tmp;
 157                         break;
 158                 case ST_SOFTLINK:
 159                         inode->i_mode |= S_IFLNK;
 160                         inode->i_size  = 0;
 161                         break;
 162         }
 163
 164         inode->i_mtime = inode->i_atime = inode->i_ctime
 165                        = (be32_to_cpu(file_end->created.ds_Days) * (24 * 60 * 60) +
 166                          be32_to_cpu(file_end->created.ds_Minute) * 60 +
 167                          be32_to_cpu(file_end->created.ds_Tick) / 50 +
 168                          ((8 * 365 + 2) * 24 * 60 * 60)) +
 169                          sys_tz.tz_minuteswest * 60;
 170         affs_brelse(bh);
 171
 172         if (S_ISREG(inode->i_mode)) {
 173                 if (inode->i_sb->u.affs_sb.s_flags & SF_OFS) {
 174                         inode->i_op = &affs_file_inode_operations;
 175                         inode->i_fop = &affs_file_operations_ofs;
 176                         return;
 177                 }
 178                 inode->i_op = &affs_file_inode_operations;
 179                 inode->i_fop = &affs_file_operations;
 180                 inode->i_mapping->a_ops = &affs_aops;
 181                 inode->u.affs_i.mmu_private = inode->i_size;
 182         } else if (S_ISDIR(inode->i_mode)) {
 183                 /* Maybe it should be controlled by mount parameter? */
 184                 inode->i_mode |= S_ISVTX;
 185                 inode->i_op = &affs_dir_inode_operations;
 186                 inode->i_fop = &affs_dir_operations;
 187         }
 188         else if (S_ISLNK(inode->i_mode)) {
 189                 inode->i_op = &affs_symlink_inode_operations;
 190                 inode->i_data.a_ops = &affs_symlink_aops;
 191         }
 192 }
 193
 194 void
 195 affs_write_inode(struct inode *inode, int unused)
 196 {
 197         struct buffer_head      *bh;
 198         struct file_end         *file_end;
 199         uid_t                    uid;
 200         gid_t                    gid;
 201
 202         pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 203
 204         if (!inode->i_nlink)
 205                 return;
 206         lock_kernel();
 207         if (!(bh = bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode)))) {
 208                 affs_error(inode->i_sb,"write_inode","Cannot read block %lu",inode->i_ino);
 209                 unlock_kernel();
 210                 return;
 211         }
 212         file_end = GET_END_PTR(struct file_end, bh->b_data,AFFS_I2BSIZE(inode));
 213         if (file_end->secondary_type == be32_to_cpu(ST_ROOT)) {
 214                 secs_to_datestamp(inode->i_mtime,&ROOT_END(bh->b_data,inode)->disk_altered);
 215         } else {
 216                 file_end->protect   = cpu_to_be32(inode->u.affs_i.i_protect ^ FIBF_OWNER);
 217                 file_end->byte_size = cpu_to_be32(inode->i_size);
 218                 secs_to_datestamp(inode->i_mtime,&file_end->created);
 219                 if (!(inode->i_ino == inode->i_sb->u.affs_sb.s_root_block)) {
 220                         uid = inode->i_uid;
 221                         gid = inode->i_gid;
 222                         if (inode->i_sb->u.affs_sb.s_flags & SF_MUFS) {
 223                                 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 224                                         uid = inode->i_uid ^ ~0;
 225                                 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 226                                         gid = inode->i_gid ^ ~0;
 227                         }
 228                         if (!(inode->i_sb->u.affs_sb.s_flags & SF_SETUID))
 229                                 file_end->owner_uid = cpu_to_be16(uid);
 230                         if (!(inode->i_sb->u.affs_sb.s_flags & SF_SETGID))
 231                                 file_end->owner_gid = cpu_to_be16(gid);
 232                 }
 233         }
 234         affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
 235         mark_buffer_dirty(bh);
 236         brelse(bh);
 237         unlock_kernel();
 238 }
 239
 240 int
 241 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 242 {
 243         struct inode *inode = dentry->d_inode;
 244         int error;
 245
 246         pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 247
 248         error = inode_change_ok(inode,attr);
 249         if (error)
 250                 goto out;
 251
 252         if (((attr->ia_valid & ATTR_UID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)) ||
 253             ((attr->ia_valid & ATTR_GID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETGID)) ||
 254             ((attr->ia_valid & ATTR_MODE) &&
 255              (inode->i_sb->u.affs_sb.s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 256                 if (!(inode->i_sb->u.affs_sb.s_flags & SF_QUIET))
 257                         error = -EPERM;
 258                 goto out;
 259         }
 260
 261         if (attr->ia_valid & ATTR_MODE)
 262                 inode->u.affs_i.i_protect = mode_to_prot(attr->ia_mode);
 263
 264         error = 0;
 265         inode_setattr(inode, attr);
 266 out:
 267         return error;
 268 }
 269
 270 void
 271 affs_put_inode(struct inode *inode)
 272 {
 273         pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n",
 274                 inode->i_ino,inode->i_nlink);
 275
 276         lock_kernel();
 277         affs_free_prealloc(inode);
 278         if (atomic_read(&inode->i_count) == 1) {
 279                 unsigned long cache_page = (unsigned long) inode->u.affs_i.i_ec;
 280                 if (cache_page) {
 281                         pr_debug("AFFS: freeing ext cache\n");
 282                         inode->u.affs_i.i_ec = NULL;
 283                         free_page(cache_page);
 284                 }
 285         }
 286         unlock_kernel();
 287 }
 288
 289 void
 290 affs_delete_inode(struct inode *inode)
 291 {
 292         pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n",inode->i_ino,inode->i_nlink);
 293         lock_kernel();
 294         inode->i_size = 0;
 295         if (S_ISREG(inode->i_mode) && !inode->u.affs_i.i_hlink)
 296                 affs_truncate(inode);
 297         affs_free_block(inode->i_sb,inode->i_ino);
 298         unlock_kernel();
 299         clear_inode(inode);
 300 }
 301
 302 struct inode *
 303 affs_new_inode(const struct inode *dir)
 304 {
 305         struct inode            *inode;
 306         struct super_block      *sb;
 307         s32                      block;
 308
 309         if (!dir)
 310                 return NULL;
 311
 312         sb = dir->i_sb;
 313         inode = new_inode(sb);
 314         if (!inode)
 315                 return NULL;
 316
 317         if (!(block = affs_new_header((struct inode *)dir))) {
 318                 iput(inode);
 319                 return NULL;
 320         }
 321
 322         inode->i_uid     = current->fsuid;
 323         inode->i_gid     = current->fsgid;
 324         inode->i_ino     = block;
 325         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 326
 327         inode->u.affs_i.i_original  = 0;
 328         inode->u.affs_i.i_parent    = dir->i_ino;
 329         inode->u.affs_i.i_zone      = 0;
 330         inode->u.affs_i.i_hlink     = 0;
 331         inode->u.affs_i.i_pa_cnt    = 0;
 332         inode->u.affs_i.i_pa_next   = 0;
 333         inode->u.affs_i.i_pa_last   = 0;
 334         inode->u.affs_i.i_ec        = NULL;
 335         inode->u.affs_i.i_lastblock = -1;
 336
 337         insert_inode_hash(inode);
 338         mark_inode_dirty(inode);
 339
 340         return inode;
 341 }
 342
 343 /*
 344  * Add an entry to a directory. Create the header block
 345  * and insert it into the hash table.
 346  */
 347
 348 int
 349 affs_add_entry(struct inode *dir, struct inode *link, struct inode *inode,
 350                struct dentry *dentry, int type)
 351 {
 352         struct buffer_head      *dir_bh;
 353         struct buffer_head      *inode_bh;
 354         struct buffer_head      *link_bh;
 355         int                      retval;
 356         const unsigned char     *name = dentry->d_name.name;
 357         int                      len  = dentry->d_name.len;
 358
 359         pr_debug("AFFS: add_entry(dir=%lu,inode=%lu,\"%*s\",type=%d)\n",dir->i_ino,inode->i_ino,
 360                  len,name,type);
 361
 362         if ((retval = affs_check_name(name,len)))
 363                 return retval;
 364         if (len > 30)
 365                 len = 30;
 366
 367         dir_bh   = affs_bread(dir->i_dev,dir->i_ino,AFFS_I2BSIZE(dir));
 368         inode_bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
 369         link_bh  = NULL;
 370         retval   = -EIO;
 371         if (!dir_bh || !inode_bh)
 372                 goto addentry_done;
 373         if (link) {
 374                 link_bh = affs_bread(link->i_dev,link->i_ino,AFFS_I2BSIZE(link));
 375                 if (!link_bh)
 376                         goto addentry_done;
 377         }
 378         ((struct dir_front *)inode_bh->b_data)->primary_type = cpu_to_be32(T_SHORT);
 379         ((struct dir_front *)inode_bh->b_data)->own_key      = cpu_to_be32(inode->i_ino);
 380         DIR_END(inode_bh->b_data,inode)->dir_name[0]         = len;
 381         strncpy(DIR_END(inode_bh->b_data,inode)->dir_name + 1,name,len);
 382         DIR_END(inode_bh->b_data,inode)->secondary_type = cpu_to_be32(type);
 383         DIR_END(inode_bh->b_data,inode)->parent         = cpu_to_be32(dir->i_ino);
 384
 385         lock_super(inode->i_sb);
 386         retval = affs_insert_hash(dir->i_ino,inode_bh,dir);
 387
 388         if (link_bh) {
 389                 LINK_END(inode_bh->b_data,inode)->original   = cpu_to_be32(link->i_ino);
 390                 LINK_END(inode_bh->b_data,inode)->link_chain =
 391                                                 FILE_END(link_bh->b_data,link)->link_chain;
 392                 FILE_END(link_bh->b_data,link)->link_chain   = cpu_to_be32(inode->i_ino);
 393                 affs_fix_checksum(AFFS_I2BSIZE(link),link_bh->b_data,5);
 394                 link->i_version = ++event;
 395                 mark_inode_dirty(link);
 396                 mark_buffer_dirty(link_bh);
 397         }
 398         affs_fix_checksum(AFFS_I2BSIZE(inode),inode_bh->b_data,5);
 399         affs_fix_checksum(AFFS_I2BSIZE(dir),dir_bh->b_data,5);
 400         dir->i_version = ++event;
 401         dir->i_mtime   = dir->i_atime = dir->i_ctime = CURRENT_TIME;
 402         unlock_super(inode->i_sb);
 403
 404         mark_inode_dirty(dir);
 405         mark_inode_dirty(inode);
 406         mark_buffer_dirty(dir_bh);
 407         mark_buffer_dirty(inode_bh);
 408
 409 addentry_done:
 410         affs_brelse(dir_bh);
 411         affs_brelse(inode_bh);
 412         affs_brelse(link_bh);
 413
 414         return retval;
 415 }