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/smp_lock.h>
  10 #include <linux/slab.h>
  11 #include "hpfs_fn.h"
  12
  13 void hpfs_init_inode(struct inode *i)
  14 {
  15         struct super_block *sb = i->i_sb;
  16         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  17
  18         i->i_uid = hpfs_sb(sb)->sb_uid;
  19         i->i_gid = hpfs_sb(sb)->sb_gid;
  20         i->i_mode = hpfs_sb(sb)->sb_mode;
  21         hpfs_inode->i_conv = hpfs_sb(sb)->sb_conv;
  22         i->i_size = -1;
  23         i->i_blocks = -1;
  24
  25         hpfs_inode->i_dno = 0;
  26         hpfs_inode->i_n_secs = 0;
  27         hpfs_inode->i_file_sec = 0;
  28         hpfs_inode->i_disk_sec = 0;
  29         hpfs_inode->i_dpos = 0;
  30         hpfs_inode->i_dsubdno = 0;
  31         hpfs_inode->i_ea_mode = 0;
  32         hpfs_inode->i_ea_uid = 0;
  33         hpfs_inode->i_ea_gid = 0;
  34         hpfs_inode->i_ea_size = 0;
  35
  36         hpfs_inode->i_rddir_off = NULL;
  37         hpfs_inode->i_dirty = 0;
  38
  39         i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0;
  40         i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0;
  41         i->i_atime.tv_sec = i->i_atime.tv_nsec = 0;
  42 }
  43
  44 void hpfs_read_inode(struct inode *i)
  45 {
  46         struct buffer_head *bh;
  47         struct fnode *fnode;
  48         struct super_block *sb = i->i_sb;
  49         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  50         void *ea;
  51         int ea_size;
  52
  53         if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
  54                 /*i->i_mode |= S_IFREG;
  55                 i->i_mode &= ~0111;
  56                 i->i_op = &hpfs_file_iops;
  57                 i->i_fop = &hpfs_file_ops;
  58                 i->i_nlink = 0;*/
  59                 make_bad_inode(i);
  60                 return;
  61         }
  62         if (hpfs_sb(i->i_sb)->sb_eas) {
  63                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
  64                         if (ea_size == 2) {
  65                                 i->i_uid = le16_to_cpu(*(__le16*)ea);
  66                                 hpfs_inode->i_ea_uid = 1;
  67                         }
  68                         kfree(ea);
  69                 }
  70                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
  71                         if (ea_size == 2) {
  72                                 i->i_gid = le16_to_cpu(*(__le16*)ea);
  73                                 hpfs_inode->i_ea_gid = 1;
  74                         }
  75                         kfree(ea);
  76                 }
  77                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
  78                         kfree(ea);
  79                         i->i_mode = S_IFLNK | 0777;
  80                         i->i_op = &page_symlink_inode_operations;
  81                         i->i_data.a_ops = &hpfs_symlink_aops;
  82                         i->i_nlink = 1;
  83                         i->i_size = ea_size;
  84                         i->i_blocks = 1;
  85                         brelse(bh);
  86                         return;
  87                 }
  88                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
  89                         int rdev = 0;
  90                         umode_t mode = hpfs_sb(sb)->sb_mode;
  91                         if (ea_size == 2) {
  92                                 mode = le16_to_cpu(*(__le16*)ea);
  93                                 hpfs_inode->i_ea_mode = 1;
  94                         }
  95                         kfree(ea);
  96                         i->i_mode = mode;
  97                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
  98                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
  99                                         if (ea_size == 4)
 100                                                 rdev = le32_to_cpu(*(__le32*)ea);
 101                                         kfree(ea);
 102                                 }
 103                         }
 104                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 105                                 brelse(bh);
 106                                 i->i_nlink = 1;
 107                                 i->i_size = 0;
 108                                 i->i_blocks = 1;
 109                                 init_special_inode(i, mode,
 110                                         new_decode_dev(rdev));
 111                                 return;
 112                         }
 113                 }
 114         }
 115         if (fnode->dirflag) {
 116                 int n_dnodes, n_subdirs;
 117                 i->i_mode |= S_IFDIR;
 118                 i->i_op = &hpfs_dir_iops;
 119                 i->i_fop = &hpfs_dir_ops;
 120                 hpfs_inode->i_parent_dir = fnode->up;
 121                 hpfs_inode->i_dno = fnode->u.external[0].disk_secno;
 122                 if (hpfs_sb(sb)->sb_chk >= 2) {
 123                         struct buffer_head *bh0;
 124                         if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
 125                 }
 126                 n_dnodes = 0; n_subdirs = 0;
 127                 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
 128                 i->i_blocks = 4 * n_dnodes;
 129                 i->i_size = 2048 * n_dnodes;
 130                 i->i_nlink = 2 + n_subdirs;
 131         } else {
 132                 i->i_mode |= S_IFREG;
 133                 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
 134                 i->i_op = &hpfs_file_iops;
 135                 i->i_fop = &hpfs_file_ops;
 136                 i->i_nlink = 1;
 137                 i->i_size = fnode->file_size;
 138                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 139                 i->i_data.a_ops = &hpfs_aops;
 140                 hpfs_i(i)->mmu_private = i->i_size;
 141         }
 142         brelse(bh);
 143 }
 144
 145 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 146 {
 147         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 148         /*if (fnode->acl_size_l || fnode->acl_size_s) {
 149                    Some unknown structures like ACL may be in fnode,
 150                    we'd better not overwrite them
 151                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 152         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
 153                 __le32 ea;
 154                 if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
 155                         ea = cpu_to_le32(i->i_uid);
 156                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
 157                         hpfs_inode->i_ea_uid = 1;
 158                 }
 159                 if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
 160                         ea = cpu_to_le32(i->i_gid);
 161                         hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
 162                         hpfs_inode->i_ea_gid = 1;
 163                 }
 164                 if (!S_ISLNK(i->i_mode))
 165                         if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 166                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 167                           && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 168                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
 169                                 ea = cpu_to_le32(i->i_mode);
 170                                 /* sick, but legal */
 171                                 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
 172                                 hpfs_inode->i_ea_mode = 1;
 173                         }
 174                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 175                         ea = cpu_to_le32(new_encode_dev(i->i_rdev));
 176                         hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
 177                 }
 178         }
 179 }
 180
 181 void hpfs_write_inode(struct inode *i)
 182 {
 183         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 184         struct inode *parent;
 185         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 186         if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
 187                 if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
 188                 kfree(hpfs_inode->i_rddir_off);
 189                 hpfs_inode->i_rddir_off = NULL;
 190         }
 191         mutex_lock(&hpfs_inode->i_parent_mutex);
 192         if (!i->i_nlink) {
 193                 mutex_unlock(&hpfs_inode->i_parent_mutex);
 194                 return;
 195         }
 196         parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
 197         if (parent) {
 198                 hpfs_inode->i_dirty = 0;
 199                 if (parent->i_state & I_NEW) {
 200                         hpfs_init_inode(parent);
 201                         hpfs_read_inode(parent);
 202                         unlock_new_inode(parent);
 203                 }
 204                 mutex_lock(&hpfs_inode->i_mutex);
 205                 hpfs_write_inode_nolock(i);
 206                 mutex_unlock(&hpfs_inode->i_mutex);
 207                 iput(parent);
 208         } else {
 209                 mark_inode_dirty(i);
 210         }
 211         mutex_unlock(&hpfs_inode->i_parent_mutex);
 212 }
 213
 214 void hpfs_write_inode_nolock(struct inode *i)
 215 {
 216         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 217         struct buffer_head *bh;
 218         struct fnode *fnode;
 219         struct quad_buffer_head qbh;
 220         struct hpfs_dirent *de;
 221         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 222         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 223         if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 224                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 225                         brelse(bh);
 226                         return;
 227                 }
 228         } else de = NULL;
 229         if (S_ISREG(i->i_mode)) {
 230                 fnode->file_size = i->i_size;
 231                 if (de) de->file_size = i->i_size;
 232         } else if (S_ISDIR(i->i_mode)) {
 233                 fnode->file_size = 0;
 234                 if (de) de->file_size = 0;
 235         }
 236         hpfs_write_inode_ea(i, fnode);
 237         if (de) {
 238                 de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec);
 239                 de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec);
 240                 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec);
 241                 de->read_only = !(i->i_mode & 0222);
 242                 de->ea_size = hpfs_inode->i_ea_size;
 243                 hpfs_mark_4buffers_dirty(&qbh);
 244                 hpfs_brelse4(&qbh);
 245         }
 246         if (S_ISDIR(i->i_mode)) {
 247                 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 248                         de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec);
 249                         de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec);
 250                         de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec);
 251                         de->read_only = !(i->i_mode & 0222);
 252                         de->ea_size = /*hpfs_inode->i_ea_size*/0;
 253                         de->file_size = 0;
 254                         hpfs_mark_4buffers_dirty(&qbh);
 255                         hpfs_brelse4(&qbh);
 256                 } else
 257                         hpfs_error(i->i_sb,
 258                                 "directory %08lx doesn't have '.' entry",
 259                                 (unsigned long)i->i_ino);
 260         }
 261         mark_buffer_dirty(bh);
 262         brelse(bh);
 263 }
 264
 265 int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 266 {
 267         struct inode *inode = dentry->d_inode;
 268         int error = -EINVAL;
 269
 270         lock_kernel();
 271         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 272                 goto out_unlock;
 273         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 274                 goto out_unlock;
 275
 276         error = inode_change_ok(inode, attr);
 277         if (error)
 278                 goto out_unlock;
 279
 280         if ((attr->ia_valid & ATTR_SIZE) &&
 281             attr->ia_size != i_size_read(inode)) {
 282                 error = vmtruncate(inode, attr->ia_size);
 283                 if (error)
 284                         goto out_unlock;
 285         }
 286
 287         setattr_copy(inode, attr);
 288         mark_inode_dirty(inode);
 289
 290         hpfs_write_inode(inode);
 291
 292  out_unlock:
 293         unlock_kernel();
 294         return error;
 295 }
 296
 297 void hpfs_write_if_changed(struct inode *inode)
 298 {
 299         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 300
 301         if (hpfs_inode->i_dirty)
 302                 hpfs_write_inode(inode);
 303 }
 304
 305 void hpfs_evict_inode(struct inode *inode)
 306 {
 307         truncate_inode_pages(&inode->i_data, 0);
 308         end_writeback(inode);
 309         if (!inode->i_nlink) {
 310                 lock_kernel();
 311                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 312                 unlock_kernel();
 313         }
 314 }