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/slab.h>
  10 #include "hpfs_fn.h"
  11
  12 void hpfs_init_inode(struct inode *i)
  13 {
  14         struct super_block *sb = i->i_sb;
  15         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  16
  17         i->i_uid = hpfs_sb(sb)->sb_uid;
  18         i->i_gid = hpfs_sb(sb)->sb_gid;
  19         i->i_mode = hpfs_sb(sb)->sb_mode;
  20         i->i_size = -1;
  21         i->i_blocks = -1;
  22
  23         hpfs_inode->i_dno = 0;
  24         hpfs_inode->i_n_secs = 0;
  25         hpfs_inode->i_file_sec = 0;
  26         hpfs_inode->i_disk_sec = 0;
  27         hpfs_inode->i_dpos = 0;
  28         hpfs_inode->i_dsubdno = 0;
  29         hpfs_inode->i_ea_mode = 0;
  30         hpfs_inode->i_ea_uid = 0;
  31         hpfs_inode->i_ea_gid = 0;
  32         hpfs_inode->i_ea_size = 0;
  33
  34         hpfs_inode->i_rddir_off = NULL;
  35         hpfs_inode->i_dirty = 0;
  36
  37         i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0;
  38         i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0;
  39         i->i_atime.tv_sec = i->i_atime.tv_nsec = 0;
  40 }
  41
  42 void hpfs_read_inode(struct inode *i)
  43 {
  44         struct buffer_head *bh;
  45         struct fnode *fnode;
  46         struct super_block *sb = i->i_sb;
  47         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  48         void *ea;
  49         int ea_size;
  50
  51         if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
  52                 /*i->i_mode |= S_IFREG;
  53                 i->i_mode &= ~0111;
  54                 i->i_op = &hpfs_file_iops;
  55                 i->i_fop = &hpfs_file_ops;
  56                 clear_nlink(i);*/
  57                 make_bad_inode(i);
  58                 return;
  59         }
  60         if (hpfs_sb(i->i_sb)->sb_eas) {
  61                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
  62                         if (ea_size == 2) {
  63                                 i->i_uid = le16_to_cpu(*(__le16*)ea);
  64                                 hpfs_inode->i_ea_uid = 1;
  65                         }
  66                         kfree(ea);
  67                 }
  68                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
  69                         if (ea_size == 2) {
  70                                 i->i_gid = le16_to_cpu(*(__le16*)ea);
  71                                 hpfs_inode->i_ea_gid = 1;
  72                         }
  73                         kfree(ea);
  74                 }
  75                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
  76                         kfree(ea);
  77                         i->i_mode = S_IFLNK | 0777;
  78                         i->i_op = &page_symlink_inode_operations;
  79                         i->i_data.a_ops = &hpfs_symlink_aops;
  80                         set_nlink(i, 1);
  81                         i->i_size = ea_size;
  82                         i->i_blocks = 1;
  83                         brelse(bh);
  84                         return;
  85                 }
  86                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
  87                         int rdev = 0;
  88                         umode_t mode = hpfs_sb(sb)->sb_mode;
  89                         if (ea_size == 2) {
  90                                 mode = le16_to_cpu(*(__le16*)ea);
  91                                 hpfs_inode->i_ea_mode = 1;
  92                         }
  93                         kfree(ea);
  94                         i->i_mode = mode;
  95                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
  96                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
  97                                         if (ea_size == 4)
  98                                                 rdev = le32_to_cpu(*(__le32*)ea);
  99                                         kfree(ea);
 100                                 }
 101                         }
 102                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 103                                 brelse(bh);
 104                                 set_nlink(i, 1);
 105                                 i->i_size = 0;
 106                                 i->i_blocks = 1;
 107                                 init_special_inode(i, mode,
 108                                         new_decode_dev(rdev));
 109                                 return;
 110                         }
 111                 }
 112         }
 113         if (fnode->dirflag) {
 114                 int n_dnodes, n_subdirs;
 115                 i->i_mode |= S_IFDIR;
 116                 i->i_op = &hpfs_dir_iops;
 117                 i->i_fop = &hpfs_dir_ops;
 118                 hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up);
 119                 hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno);
 120                 if (hpfs_sb(sb)->sb_chk >= 2) {
 121                         struct buffer_head *bh0;
 122                         if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
 123                 }
 124                 n_dnodes = 0; n_subdirs = 0;
 125                 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
 126                 i->i_blocks = 4 * n_dnodes;
 127                 i->i_size = 2048 * n_dnodes;
 128                 set_nlink(i, 2 + n_subdirs);
 129         } else {
 130                 i->i_mode |= S_IFREG;
 131                 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
 132                 i->i_op = &hpfs_file_iops;
 133                 i->i_fop = &hpfs_file_ops;
 134                 set_nlink(i, 1);
 135                 i->i_size = le32_to_cpu(fnode->file_size);
 136                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 137                 i->i_data.a_ops = &hpfs_aops;
 138                 hpfs_i(i)->mmu_private = i->i_size;
 139         }
 140         brelse(bh);
 141 }
 142
 143 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 144 {
 145         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 146         /*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) {
 147                    Some unknown structures like ACL may be in fnode,
 148                    we'd better not overwrite them
 149                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 150         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
 151                 __le32 ea;
 152                 if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
 153                         ea = cpu_to_le32(i->i_uid);
 154                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
 155                         hpfs_inode->i_ea_uid = 1;
 156                 }
 157                 if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
 158                         ea = cpu_to_le32(i->i_gid);
 159                         hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
 160                         hpfs_inode->i_ea_gid = 1;
 161                 }
 162                 if (!S_ISLNK(i->i_mode))
 163                         if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 164                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 165                           && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 166                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
 167                                 ea = cpu_to_le32(i->i_mode);
 168                                 /* sick, but legal */
 169                                 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
 170                                 hpfs_inode->i_ea_mode = 1;
 171                         }
 172                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 173                         ea = cpu_to_le32(new_encode_dev(i->i_rdev));
 174                         hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
 175                 }
 176         }
 177 }
 178
 179 void hpfs_write_inode(struct inode *i)
 180 {
 181         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 182         struct inode *parent;
 183         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 184         if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
 185                 if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
 186                 kfree(hpfs_inode->i_rddir_off);
 187                 hpfs_inode->i_rddir_off = NULL;
 188         }
 189         if (!i->i_nlink) {
 190                 return;
 191         }
 192         parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
 193         if (parent) {
 194                 hpfs_inode->i_dirty = 0;
 195                 if (parent->i_state & I_NEW) {
 196                         hpfs_init_inode(parent);
 197                         hpfs_read_inode(parent);
 198                         unlock_new_inode(parent);
 199                 }
 200                 hpfs_write_inode_nolock(i);
 201                 iput(parent);
 202         }
 203 }
 204
 205 void hpfs_write_inode_nolock(struct inode *i)
 206 {
 207         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 208         struct buffer_head *bh;
 209         struct fnode *fnode;
 210         struct quad_buffer_head qbh;
 211         struct hpfs_dirent *de;
 212         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 213         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 214         if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 215                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 216                         brelse(bh);
 217                         return;
 218                 }
 219         } else de = NULL;
 220         if (S_ISREG(i->i_mode)) {
 221                 fnode->file_size = cpu_to_le32(i->i_size);
 222                 if (de) de->file_size = cpu_to_le32(i->i_size);
 223         } else if (S_ISDIR(i->i_mode)) {
 224                 fnode->file_size = cpu_to_le32(0);
 225                 if (de) de->file_size = cpu_to_le32(0);
 226         }
 227         hpfs_write_inode_ea(i, fnode);
 228         if (de) {
 229                 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 230                 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 231                 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 232                 de->read_only = !(i->i_mode & 0222);
 233                 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
 234                 hpfs_mark_4buffers_dirty(&qbh);
 235                 hpfs_brelse4(&qbh);
 236         }
 237         if (S_ISDIR(i->i_mode)) {
 238                 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 239                         de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 240                         de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 241                         de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 242                         de->read_only = !(i->i_mode & 0222);
 243                         de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
 244                         de->file_size = cpu_to_le32(0);
 245                         hpfs_mark_4buffers_dirty(&qbh);
 246                         hpfs_brelse4(&qbh);
 247                 } else
 248                         hpfs_error(i->i_sb,
 249                                 "directory %08lx doesn't have '.' entry",
 250                                 (unsigned long)i->i_ino);
 251         }
 252         mark_buffer_dirty(bh);
 253         brelse(bh);
 254 }
 255
 256 int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 257 {
 258         struct inode *inode = dentry->d_inode;
 259         int error = -EINVAL;
 260
 261         hpfs_lock(inode->i_sb);
 262         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 263                 goto out_unlock;
 264         if ((attr->ia_valid & ATTR_UID) && attr->ia_uid >= 0x10000)
 265                 goto out_unlock;
 266         if ((attr->ia_valid & ATTR_GID) && attr->ia_gid >= 0x10000)
 267                 goto out_unlock;
 268         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 269                 goto out_unlock;
 270
 271         error = inode_change_ok(inode, attr);
 272         if (error)
 273                 goto out_unlock;
 274
 275         if ((attr->ia_valid & ATTR_SIZE) &&
 276             attr->ia_size != i_size_read(inode)) {
 277                 error = vmtruncate(inode, attr->ia_size);
 278                 if (error)
 279                         goto out_unlock;
 280         }
 281
 282         setattr_copy(inode, attr);
 283
 284         hpfs_write_inode(inode);
 285
 286  out_unlock:
 287         hpfs_unlock(inode->i_sb);
 288         return error;
 289 }
 290
 291 void hpfs_write_if_changed(struct inode *inode)
 292 {
 293         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 294
 295         if (hpfs_inode->i_dirty)
 296                 hpfs_write_inode(inode);
 297 }
 298
 299 void hpfs_evict_inode(struct inode *inode)
 300 {
 301         truncate_inode_pages(&inode->i_data, 0);
 302         end_writeback(inode);
 303         if (!inode->i_nlink) {
 304                 hpfs_lock(inode->i_sb);
 305                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 306                 hpfs_unlock(inode->i_sb);
 307         }
 308 }