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 struct file_operations hpfs_file_ops =
  12 {
  13         read:           generic_file_read,
  14         write:          hpfs_file_write,
  15         mmap:           generic_file_mmap,
  16         open:           hpfs_open,
  17         release:        hpfs_file_release,
  18         fsync:          hpfs_file_fsync,
  19 };
  20
  21 static struct inode_operations hpfs_file_iops =
  22 {
  23         truncate:       hpfs_truncate,
  24         setattr:        hpfs_notify_change,
  25 };
  26
  27 static struct file_operations hpfs_dir_ops =
  28 {
  29         llseek:         hpfs_dir_lseek,
  30         read:           generic_read_dir,
  31         readdir:        hpfs_readdir,
  32         open:           hpfs_open,
  33         release:        hpfs_dir_release,
  34         fsync:          hpfs_file_fsync,
  35 };
  36
  37 static struct inode_operations hpfs_dir_iops =
  38 {
  39         create:         hpfs_create,
  40         lookup:         hpfs_lookup,
  41         unlink:         hpfs_unlink,
  42         symlink:        hpfs_symlink,
  43         mkdir:          hpfs_mkdir,
  44         rmdir:          hpfs_rmdir,
  45         mknod:          hpfs_mknod,
  46         rename:         hpfs_rename,
  47         setattr:        hpfs_notify_change,
  48 };
  49
  50 struct address_space_operations hpfs_symlink_aops = {
  51         readpage:       hpfs_symlink_readpage
  52 };
  53
  54 void hpfs_read_inode(struct inode *i)
  55 {
  56         struct buffer_head *bh;
  57         struct fnode *fnode;
  58         struct super_block *sb = i->i_sb;
  59         unsigned char *ea;
  60         int ea_size;
  61         init_MUTEX(&i->i_hpfs_sem);
  62         i->i_uid = sb->s_hpfs_uid;
  63         i->i_gid = sb->s_hpfs_gid;
  64         i->i_mode = sb->s_hpfs_mode;
  65         i->i_hpfs_conv = sb->s_hpfs_conv;
  66         i->i_blksize = 512;
  67         i->i_size = -1;
  68         i->i_blocks = -1;
  69
  70         i->i_hpfs_dno = 0;
  71         i->i_hpfs_n_secs = 0;
  72         i->i_hpfs_file_sec = 0;
  73         i->i_hpfs_disk_sec = 0;
  74         i->i_hpfs_dpos = 0;
  75         i->i_hpfs_dsubdno = 0;
  76         i->i_hpfs_ea_mode = 0;
  77         i->i_hpfs_ea_uid = 0;
  78         i->i_hpfs_ea_gid = 0;
  79         i->i_hpfs_ea_size = 0;
  80         i->i_version = ++event;
  81
  82         i->i_hpfs_rddir_off = NULL;
  83         i->i_hpfs_dirty = 0;
  84
  85         i->i_atime = 0;
  86         i->i_mtime = 0;
  87         i->i_ctime = 0;
  88
  89         if (!i->i_sb->s_hpfs_rd_inode)
  90                 hpfs_error(i->i_sb, "read_inode: s_hpfs_rd_inode == 0");
  91         if (i->i_sb->s_hpfs_rd_inode == 2) {
  92                 i->i_mode |= S_IFREG;
  93                 i->i_mode &= ~0111;
  94                 i->i_op = &hpfs_file_iops;
  95                 i->i_fop = &hpfs_file_ops;
  96                 i->i_nlink = 1;
  97                 return;
  98         }
  99         if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
 100                 /*i->i_mode |= S_IFREG;
 101                 i->i_mode &= ~0111;
 102                 i->i_op = &hpfs_file_iops;
 103                 i->i_fop = &hpfs_file_ops;
 104                 i->i_nlink = 0;*/
 105                 make_bad_inode(i);
 106                 return;
 107         }
 108         if (i->i_sb->s_hpfs_eas) {
 109                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
 110                         if (ea_size == 2) {
 111                                 i->i_uid = ea[0] + (ea[1] << 8);
 112                                 i->i_hpfs_ea_uid = 1;
 113                         }
 114                         kfree(ea);
 115                 }
 116                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
 117                         if (ea_size == 2) {
 118                                 i->i_gid = ea[0] + (ea[1] << 8);
 119                                 i->i_hpfs_ea_gid = 1;
 120                         }
 121                         kfree(ea);
 122                 }
 123                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
 124                         kfree(ea);
 125                         i->i_mode = S_IFLNK | 0777;
 126                         i->i_op = &page_symlink_inode_operations;
 127                         i->i_data.a_ops = &hpfs_symlink_aops;
 128                         i->i_nlink = 1;
 129                         i->i_size = ea_size;
 130                         i->i_blocks = 1;
 131                         brelse(bh);
 132                         return;
 133                 }
 134                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
 135                         int rdev = 0;
 136                         umode_t mode = sb->s_hpfs_mode;
 137                         if (ea_size == 2) {
 138                                 mode = ea[0] + (ea[1] << 8);
 139                                 i->i_hpfs_ea_mode = 1;
 140                         }
 141                         kfree(ea);
 142                         i->i_mode = mode;
 143                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 144                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
 145                                         if (ea_size == 4)
 146                                                 rdev = ea[0] + (ea[1] << 8) + (ea[2] << 16) + (ea[3] << 24);
 147                                         kfree(ea);
 148                                 }
 149                         }
 150                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 151                                 brelse(bh);
 152                                 i->i_nlink = 1;
 153                                 i->i_size = 0;
 154                                 i->i_blocks = 1;
 155                                 init_special_inode(i, mode, rdev);
 156                                 return;
 157                         }
 158                 }
 159         }
 160         if (fnode->dirflag) {
 161                 unsigned n_dnodes, n_subdirs;
 162                 i->i_mode |= S_IFDIR;
 163                 i->i_op = &hpfs_dir_iops;
 164                 i->i_fop = &hpfs_dir_ops;
 165                 i->i_hpfs_parent_dir = fnode->up;
 166                 i->i_hpfs_dno = fnode->u.external[0].disk_secno;
 167                 if (sb->s_hpfs_chk >= 2) {
 168                         struct buffer_head *bh0;
 169                         if (hpfs_map_fnode(sb, i->i_hpfs_parent_dir, &bh0)) brelse(bh0);
 170                 }
 171                 n_dnodes = 0; n_subdirs = 0;
 172                 hpfs_count_dnodes(i->i_sb, i->i_hpfs_dno, &n_dnodes, &n_subdirs, NULL);
 173                 i->i_blocks = 4 * n_dnodes;
 174                 i->i_size = 2048 * n_dnodes;
 175                 i->i_nlink = 2 + n_subdirs;
 176         } else {
 177                 i->i_mode |= S_IFREG;
 178                 if (!i->i_hpfs_ea_mode) i->i_mode &= ~0111;
 179                 i->i_op = &hpfs_file_iops;
 180                 i->i_fop = &hpfs_file_ops;
 181                 i->i_nlink = 1;
 182                 i->i_size = fnode->file_size;
 183                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 184                 i->i_data.a_ops = &hpfs_aops;
 185                 i->u.hpfs_i.mmu_private = i->i_size;
 186         }
 187         brelse(bh);
 188 }
 189
 190 void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 191 {
 192         if (fnode->acl_size_l || fnode->acl_size_s) {
 193                 /* Some unknown structures like ACL may be in fnode,
 194                    we'd better not overwrite them */
 195                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 196         } else if (i->i_sb->s_hpfs_eas >= 2) {
 197                 unsigned char ea[4];
 198                 if ((i->i_uid != i->i_sb->s_hpfs_uid) || i->i_hpfs_ea_uid) {
 199                         ea[0] = i->i_uid & 0xff;
 200                         ea[1] = i->i_uid >> 8;
 201                         hpfs_set_ea(i, fnode, "UID", ea, 2);
 202                         i->i_hpfs_ea_uid = 1;
 203                 }
 204                 if ((i->i_gid != i->i_sb->s_hpfs_gid) || i->i_hpfs_ea_gid) {
 205                         ea[0] = i->i_gid & 0xff;
 206                         ea[1] = i->i_gid >> 8;
 207                         hpfs_set_ea(i, fnode, "GID", ea, 2);
 208                         i->i_hpfs_ea_gid = 1;
 209                 }
 210                 if (!S_ISLNK(i->i_mode))
 211                         if ((i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 212                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 213                           && i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 214                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || i->i_hpfs_ea_mode) {
 215                                 ea[0] = i->i_mode & 0xff;
 216                                 ea[1] = i->i_mode >> 8;
 217                                 hpfs_set_ea(i, fnode, "MODE", ea, 2);
 218                                 i->i_hpfs_ea_mode = 1;
 219                         }
 220                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 221                         int d = kdev_t_to_nr(i->i_rdev);
 222                         ea[0] = d & 0xff;
 223                         ea[1] = (d >> 8) & 0xff;
 224                         ea[2] = (d >> 16) & 0xff;
 225                         ea[3] = d >> 24;
 226                         hpfs_set_ea(i, fnode, "DEV", ea, 4);
 227                 }
 228         }
 229 }
 230
 231 void hpfs_write_inode(struct inode *i)
 232 {
 233         struct inode *parent;
 234         if (!i->i_nlink) return;
 235         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 236         if (i->i_hpfs_rddir_off && !atomic_read(&i->i_count)) {
 237                 if (*i->i_hpfs_rddir_off) printk("HPFS: write_inode: some position still there\n");
 238                 kfree(i->i_hpfs_rddir_off);
 239                 i->i_hpfs_rddir_off = NULL;
 240         }
 241         i->i_hpfs_dirty = 0;
 242         hpfs_lock_iget(i->i_sb, 1);
 243         parent = iget(i->i_sb, i->i_hpfs_parent_dir);
 244         hpfs_unlock_iget(i->i_sb);
 245         hpfs_lock_inode(parent);
 246         hpfs_write_inode_nolock(i);
 247         hpfs_unlock_inode(parent);
 248         iput(parent);
 249 }
 250
 251 void hpfs_write_inode_nolock(struct inode *i)
 252 {
 253         struct buffer_head *bh;
 254         struct fnode *fnode;
 255         struct quad_buffer_head qbh;
 256         struct hpfs_dirent *de;
 257         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 258         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 259         if (i->i_ino != i->i_sb->s_hpfs_root) {
 260                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 261                         brelse(bh);
 262                         return;
 263                 }
 264         } else de = NULL;
 265         if (S_ISREG(i->i_mode)) {
 266                 fnode->file_size = de->file_size = i->i_size;
 267         } else if (S_ISDIR(i->i_mode)) {
 268                 fnode->file_size = de->file_size = 0;
 269         }
 270         hpfs_write_inode_ea(i, fnode);
 271         if (de) {
 272                 de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 273                 de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 274                 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 275                 de->read_only = !(i->i_mode & 0222);
 276                 de->ea_size = i->i_hpfs_ea_size;
 277                 hpfs_mark_4buffers_dirty(&qbh);
 278                 hpfs_brelse4(&qbh);
 279         }
 280         if (S_ISDIR(i->i_mode)) {
 281                 if ((de = map_dirent(i, i->i_hpfs_dno, "\001\001", 2, NULL, &qbh))) {
 282                         de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 283                         de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 284                         de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 285                         de->read_only = !(i->i_mode & 0222);
 286                         de->ea_size = /*i->i_hpfs_ea_size*/0;
 287                         de->file_size = 0;
 288                         hpfs_mark_4buffers_dirty(&qbh);
 289                         hpfs_brelse4(&qbh);
 290                 } else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
 291         }
 292         mark_buffer_dirty(bh, 1);
 293         brelse(bh);
 294 }
 295
 296 int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
 297 {
 298         struct inode *inode = dentry->d_inode;
 299         int error;
 300         if (inode->i_sb->s_hpfs_root == inode->i_ino) return -EINVAL;
 301         if ((error = inode_change_ok(inode, attr))) return error;
 302         inode_setattr(inode, attr);
 303         hpfs_write_inode(inode);
 304         return 0;
 305 }
 306
 307 void hpfs_write_if_changed(struct inode *inode)
 308 {
 309         if (inode->i_hpfs_dirty) {
 310                 hpfs_write_inode(inode);
 311         }
 312 }
 313
 314 void hpfs_delete_inode(struct inode *inode)
 315 {
 316         hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 317         clear_inode(inode);
 318 }