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