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 <linux/sched.h>
  10 #include <linux/smp_lock.h>
  11 #include "hpfs_fn.h"
  12
  13 static struct file_operations hpfs_file_ops =
  14 {
  15         llseek:         generic_file_llseek,
  16         read:           generic_file_read,
  17         write:          hpfs_file_write,
  18         mmap:           generic_file_mmap,
  19         open:           hpfs_open,
  20         release:        hpfs_file_release,
  21         fsync:          hpfs_file_fsync,
  22 };
  23
  24 static struct inode_operations hpfs_file_iops =
  25 {
  26         truncate:       hpfs_truncate,
  27         setattr:        hpfs_notify_change,
  28 };
  29
  30 static struct file_operations hpfs_dir_ops =
  31 {
  32         llseek:         hpfs_dir_lseek,
  33         read:           generic_read_dir,
  34         readdir:        hpfs_readdir,
  35         open:           hpfs_open,
  36         release:        hpfs_dir_release,
  37         fsync:          hpfs_file_fsync,
  38 };
  39
  40 static struct inode_operations hpfs_dir_iops =
  41 {
  42         create:         hpfs_create,
  43         lookup:         hpfs_lookup,
  44         unlink:         hpfs_unlink,
  45         symlink:        hpfs_symlink,
  46         mkdir:          hpfs_mkdir,
  47         rmdir:          hpfs_rmdir,
  48         mknod:          hpfs_mknod,
  49         rename:         hpfs_rename,
  50         setattr:        hpfs_notify_change,
  51 };
  52
  53 struct address_space_operations hpfs_symlink_aops = {
  54         readpage:       hpfs_symlink_readpage
  55 };
  56
  57 void hpfs_read_inode(struct inode *i)
  58 {
  59         struct buffer_head *bh;
  60         struct fnode *fnode;
  61         struct super_block *sb = i->i_sb;
  62         unsigned char *ea;
  63         int ea_size;
  64         init_MUTEX(&i->i_hpfs_sem);
  65         i->i_uid = sb->s_hpfs_uid;
  66         i->i_gid = sb->s_hpfs_gid;
  67         i->i_mode = sb->s_hpfs_mode;
  68         i->i_hpfs_conv = sb->s_hpfs_conv;
  69         i->i_blksize = 512;
  70         i->i_size = -1;
  71         i->i_blocks = -1;
  72
  73         i->i_hpfs_dno = 0;
  74         i->i_hpfs_n_secs = 0;
  75         i->i_hpfs_file_sec = 0;
  76         i->i_hpfs_disk_sec = 0;
  77         i->i_hpfs_dpos = 0;
  78         i->i_hpfs_dsubdno = 0;
  79         i->i_hpfs_ea_mode = 0;
  80         i->i_hpfs_ea_uid = 0;
  81         i->i_hpfs_ea_gid = 0;
  82         i->i_hpfs_ea_size = 0;
  83         i->i_version = ++event;
  84
  85         i->i_hpfs_rddir_off = NULL;
  86         i->i_hpfs_dirty = 0;
  87
  88         i->i_atime = 0;
  89         i->i_mtime = 0;
  90         i->i_ctime = 0;
  91
  92         if (!i->i_sb->s_hpfs_rd_inode)
  93                 hpfs_error(i->i_sb, "read_inode: s_hpfs_rd_inode == 0");
  94         if (i->i_sb->s_hpfs_rd_inode == 2) {
  95                 i->i_mode |= S_IFREG;
  96                 i->i_mode &= ~0111;
  97                 i->i_op = &hpfs_file_iops;
  98                 i->i_fop = &hpfs_file_ops;
  99                 i->i_nlink = 1;
 100                 return;
 101         }
 102         if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
 103                 /*i->i_mode |= S_IFREG;
 104                 i->i_mode &= ~0111;
 105                 i->i_op = &hpfs_file_iops;
 106                 i->i_fop = &hpfs_file_ops;
 107                 i->i_nlink = 0;*/
 108                 make_bad_inode(i);
 109                 return;
 110         }
 111         if (i->i_sb->s_hpfs_eas) {
 112                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
 113                         if (ea_size == 2) {
 114                                 i->i_uid = ea[0] + (ea[1] << 8);
 115                                 i->i_hpfs_ea_uid = 1;
 116                         }
 117                         kfree(ea);
 118                 }
 119                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
 120                         if (ea_size == 2) {
 121                                 i->i_gid = ea[0] + (ea[1] << 8);
 122                                 i->i_hpfs_ea_gid = 1;
 123                         }
 124                         kfree(ea);
 125                 }
 126                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
 127                         kfree(ea);
 128                         i->i_mode = S_IFLNK | 0777;
 129                         i->i_op = &page_symlink_inode_operations;
 130                         i->i_data.a_ops = &hpfs_symlink_aops;
 131                         i->i_nlink = 1;
 132                         i->i_size = ea_size;
 133                         i->i_blocks = 1;
 134                         brelse(bh);
 135                         return;
 136                 }
 137                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
 138                         int rdev = 0;
 139                         umode_t mode = sb->s_hpfs_mode;
 140                         if (ea_size == 2) {
 141                                 mode = ea[0] + (ea[1] << 8);
 142                                 i->i_hpfs_ea_mode = 1;
 143                         }
 144                         kfree(ea);
 145                         i->i_mode = mode;
 146                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 147                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
 148                                         if (ea_size == 4)
 149                                                 rdev = ea[0] + (ea[1] << 8) + (ea[2] << 16) + (ea[3] << 24);
 150                                         kfree(ea);
 151                                 }
 152                         }
 153                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 154                                 brelse(bh);
 155                                 i->i_nlink = 1;
 156                                 i->i_size = 0;
 157                                 i->i_blocks = 1;
 158                                 init_special_inode(i, mode, rdev);
 159                                 return;
 160                         }
 161                 }
 162         }
 163         if (fnode->dirflag) {
 164                 unsigned n_dnodes, n_subdirs;
 165                 i->i_mode |= S_IFDIR;
 166                 i->i_op = &hpfs_dir_iops;
 167                 i->i_fop = &hpfs_dir_ops;
 168                 i->i_hpfs_parent_dir = fnode->up;
 169                 i->i_hpfs_dno = fnode->u.external[0].disk_secno;
 170                 if (sb->s_hpfs_chk >= 2) {
 171                         struct buffer_head *bh0;
 172                         if (hpfs_map_fnode(sb, i->i_hpfs_parent_dir, &bh0)) brelse(bh0);
 173                 }
 174                 n_dnodes = 0; n_subdirs = 0;
 175                 hpfs_count_dnodes(i->i_sb, i->i_hpfs_dno, &n_dnodes, &n_subdirs, NULL);
 176                 i->i_blocks = 4 * n_dnodes;
 177                 i->i_size = 2048 * n_dnodes;
 178                 i->i_nlink = 2 + n_subdirs;
 179         } else {
 180                 i->i_mode |= S_IFREG;
 181                 if (!i->i_hpfs_ea_mode) i->i_mode &= ~0111;
 182                 i->i_op = &hpfs_file_iops;
 183                 i->i_fop = &hpfs_file_ops;
 184                 i->i_nlink = 1;
 185                 i->i_size = fnode->file_size;
 186                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 187                 i->i_data.a_ops = &hpfs_aops;
 188                 i->u.hpfs_i.mmu_private = i->i_size;
 189         }
 190         brelse(bh);
 191 }
 192
 193 void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 194 {
 195         if (fnode->acl_size_l || fnode->acl_size_s) {
 196                 /* Some unknown structures like ACL may be in fnode,
 197                    we'd better not overwrite them */
 198                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 199         } else if (i->i_sb->s_hpfs_eas >= 2) {
 200                 unsigned char ea[4];
 201                 if ((i->i_uid != i->i_sb->s_hpfs_uid) || i->i_hpfs_ea_uid) {
 202                         ea[0] = i->i_uid & 0xff;
 203                         ea[1] = i->i_uid >> 8;
 204                         hpfs_set_ea(i, fnode, "UID", ea, 2);
 205                         i->i_hpfs_ea_uid = 1;
 206                 }
 207                 if ((i->i_gid != i->i_sb->s_hpfs_gid) || i->i_hpfs_ea_gid) {
 208                         ea[0] = i->i_gid & 0xff;
 209                         ea[1] = i->i_gid >> 8;
 210                         hpfs_set_ea(i, fnode, "GID", ea, 2);
 211                         i->i_hpfs_ea_gid = 1;
 212                 }
 213                 if (!S_ISLNK(i->i_mode))
 214                         if ((i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 215                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 216                           && i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 217                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || i->i_hpfs_ea_mode) {
 218                                 ea[0] = i->i_mode & 0xff;
 219                                 ea[1] = i->i_mode >> 8;
 220                                 hpfs_set_ea(i, fnode, "MODE", ea, 2);
 221                                 i->i_hpfs_ea_mode = 1;
 222                         }
 223                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 224                         int d = kdev_t_to_nr(i->i_rdev);
 225                         ea[0] = d & 0xff;
 226                         ea[1] = (d >> 8) & 0xff;
 227                         ea[2] = (d >> 16) & 0xff;
 228                         ea[3] = d >> 24;
 229                         hpfs_set_ea(i, fnode, "DEV", ea, 4);
 230                 }
 231         }
 232 }
 233
 234 void hpfs_write_inode(struct inode *i)
 235 {
 236         struct inode *parent;
 237         if (!i->i_nlink) return;
 238         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 239         if (i->i_hpfs_rddir_off && !atomic_read(&i->i_count)) {
 240                 if (*i->i_hpfs_rddir_off) printk("HPFS: write_inode: some position still there\n");
 241                 kfree(i->i_hpfs_rddir_off);
 242                 i->i_hpfs_rddir_off = NULL;
 243         }
 244         i->i_hpfs_dirty = 0;
 245         hpfs_lock_iget(i->i_sb, 1);
 246         parent = iget(i->i_sb, i->i_hpfs_parent_dir);
 247         hpfs_unlock_iget(i->i_sb);
 248         hpfs_lock_inode(parent);
 249         hpfs_write_inode_nolock(i);
 250         hpfs_unlock_inode(parent);
 251         iput(parent);
 252 }
 253
 254 void hpfs_write_inode_nolock(struct inode *i)
 255 {
 256         struct buffer_head *bh;
 257         struct fnode *fnode;
 258         struct quad_buffer_head qbh;
 259         struct hpfs_dirent *de;
 260         if (i->i_ino == i->i_sb->s_hpfs_root) return;
 261         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 262         if (i->i_ino != i->i_sb->s_hpfs_root) {
 263                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 264                         brelse(bh);
 265                         return;
 266                 }
 267         } else de = NULL;
 268         if (S_ISREG(i->i_mode)) {
 269                 fnode->file_size = de->file_size = i->i_size;
 270         } else if (S_ISDIR(i->i_mode)) {
 271                 fnode->file_size = de->file_size = 0;
 272         }
 273         hpfs_write_inode_ea(i, fnode);
 274         if (de) {
 275                 de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 276                 de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 277                 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 278                 de->read_only = !(i->i_mode & 0222);
 279                 de->ea_size = i->i_hpfs_ea_size;
 280                 hpfs_mark_4buffers_dirty(&qbh);
 281                 hpfs_brelse4(&qbh);
 282         }
 283         if (S_ISDIR(i->i_mode)) {
 284                 if ((de = map_dirent(i, i->i_hpfs_dno, "\001\001", 2, NULL, &qbh))) {
 285                         de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
 286                         de->read_date = gmt_to_local(i->i_sb, i->i_atime);
 287                         de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
 288                         de->read_only = !(i->i_mode & 0222);
 289                         de->ea_size = /*i->i_hpfs_ea_size*/0;
 290                         de->file_size = 0;
 291                         hpfs_mark_4buffers_dirty(&qbh);
 292                         hpfs_brelse4(&qbh);
 293                 } else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
 294         }
 295         mark_buffer_dirty(bh);
 296         brelse(bh);
 297 }
 298
 299 int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
 300 {
 301         struct inode *inode = dentry->d_inode;
 302         int error;
 303         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 304                 return -EINVAL;
 305         if (inode->i_sb->s_hpfs_root == inode->i_ino) return -EINVAL;
 306         if ((error = inode_change_ok(inode, attr))) return error;
 307         error = inode_setattr(inode, attr);
 308         if (error) return error;
 309         hpfs_write_inode(inode);
 310         return 0;
 311 }
 312
 313 void hpfs_write_if_changed(struct inode *inode)
 314 {
 315         if (inode->i_hpfs_dirty) {
 316                 hpfs_write_inode(inode);
 317         }
 318 }
 319
 320 void hpfs_delete_inode(struct inode *inode)
 321 {
 322         lock_kernel();
 323         hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 324         unlock_kernel();
 325         clear_inode(inode);
 326 }