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