fs/hpfs/dir.c

   1 /*
   2  *  linux/fs/hpfs/dir.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  directory VFS functions
   7  */
   8
   9 #include <linux/slab.h>
  10 #include "hpfs_fn.h"
  11
  12 static int hpfs_dir_release(struct inode *inode, struct file *filp)
  13 {
  14         hpfs_lock(inode->i_sb);
  15         hpfs_del_pos(inode, &filp->f_pos);
  16         /*hpfs_write_if_changed(inode);*/
  17         hpfs_unlock(inode->i_sb);
  18         return 0;
  19 }
  20
  21 /* This is slow, but it's not used often */
  22
  23 static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
  24 {
  25         loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
  26         loff_t pos;
  27         struct quad_buffer_head qbh;
  28         struct inode *i = file_inode(filp);
  29         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  30         struct super_block *s = i->i_sb;
  31
  32         /* Somebody else will have to figure out what to do here */
  33         if (whence == SEEK_DATA || whence == SEEK_HOLE)
  34                 return -EINVAL;
  35
  36         mutex_lock(&i->i_mutex);
  37         hpfs_lock(s);
  38
  39         /*printk("dir lseek\n");*/
  40         if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
  41         pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1;
  42         while (pos != new_off) {
  43                 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
  44                 else goto fail;
  45                 if (pos == 12) goto fail;
  46         }
  47         hpfs_add_pos(i, &filp->f_pos);
  48 ok:
  49         filp->f_pos = new_off;
  50         hpfs_unlock(s);
  51         mutex_unlock(&i->i_mutex);
  52         return new_off;
  53 fail:
  54         /*printk("illegal lseek: %016llx\n", new_off);*/
  55         hpfs_unlock(s);
  56         mutex_unlock(&i->i_mutex);
  57         return -ESPIPE;
  58 }
  59
  60 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
  61 {
  62         struct inode *inode = file_inode(filp);
  63         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
  64         struct quad_buffer_head qbh;
  65         struct hpfs_dirent *de;
  66         int lc;
  67         long old_pos;
  68         unsigned char *tempname;
  69         int c1, c2 = 0;
  70         int ret = 0;
  71
  72         hpfs_lock(inode->i_sb);
  73
  74         if (hpfs_sb(inode->i_sb)->sb_chk) {
  75                 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
  76                         ret = -EFSERROR;
  77                         goto out;
  78                 }
  79                 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) {
  80                         ret = -EFSERROR;
  81                         goto out;
  82                 }
  83         }
  84         if (hpfs_sb(inode->i_sb)->sb_chk >= 2) {
  85                 struct buffer_head *bh;
  86                 struct fnode *fno;
  87                 int e = 0;
  88                 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) {
  89                         ret = -EIOERROR;
  90                         goto out;
  91                 }
  92                 if (!fnode_is_dir(fno)) {
  93                         e = 1;
  94                         hpfs_error(inode->i_sb, "not a directory, fnode %08lx",
  95                                         (unsigned long)inode->i_ino);
  96                 }
  97                 if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) {
  98                         e = 1;
  99                         hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno));
 100                 }
 101                 brelse(bh);
 102                 if (e) {
 103                         ret = -EFSERROR;
 104                         goto out;
 105                 }
 106         }
 107         lc = hpfs_sb(inode->i_sb)->sb_lowercase;
 108         if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
 109                 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
 110                 goto out;
 111         }
 112         if (filp->f_pos == 13) {
 113                 ret = -ENOENT;
 114                 goto out;
 115         }
 116
 117         while (1) {
 118                 again:
 119                 /* This won't work when cycle is longer than number of dirents
 120                    accepted by filldir, but what can I do?
 121                    maybe killall -9 ls helps */
 122                 if (hpfs_sb(inode->i_sb)->sb_chk)
 123                         if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
 124                                 ret = -EFSERROR;
 125                                 goto out;
 126                         }
 127                 if (filp->f_pos == 12)
 128                         goto out;
 129                 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
 130                         printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
 131                         goto out;
 132                 }
 133                 if (filp->f_pos == 0) {
 134                         if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
 135                                 goto out;
 136                         filp->f_pos = 11;
 137                 }
 138                 if (filp->f_pos == 11) {
 139                         if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
 140                                 goto out;
 141                         filp->f_pos = 1;
 142                 }
 143                 if (filp->f_pos == 1) {
 144                         filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
 145                         hpfs_add_pos(inode, &filp->f_pos);
 146                         filp->f_version = inode->i_version;
 147                 }
 148                 old_pos = filp->f_pos;
 149                 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
 150                         ret = -EIOERROR;
 151                         goto out;
 152                 }
 153                 if (de->first || de->last) {
 154                         if (hpfs_sb(inode->i_sb)->sb_chk) {
 155                                 if (de->first && !de->last && (de->namelen != 2
 156                                     || de ->name[0] != 1 || de->name[1] != 1))
 157                                         hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos);
 158                                 if (de->last && (de->namelen != 1 || de ->name[0] != 255))
 159                                         hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos);
 160                         }
 161                         hpfs_brelse4(&qbh);
 162                         goto again;
 163                 }
 164                 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
 165                 if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) {
 166                         filp->f_pos = old_pos;
 167                         if (tempname != de->name) kfree(tempname);
 168                         hpfs_brelse4(&qbh);
 169                         goto out;
 170                 }
 171                 if (tempname != de->name) kfree(tempname);
 172                 hpfs_brelse4(&qbh);
 173         }
 174 out:
 175         hpfs_unlock(inode->i_sb);
 176         return ret;
 177 }
 178
 179 /*
 180  * lookup.  Search the specified directory for the specified name, set
 181  * *result to the corresponding inode.
 182  *
 183  * lookup uses the inode number to tell read_inode whether it is reading
 184  * the inode of a directory or a file -- file ino's are odd, directory
 185  * ino's are even.  read_inode avoids i/o for file inodes; everything
 186  * needed is up here in the directory.  (And file fnodes are out in
 187  * the boondocks.)
 188  *
 189  *    - M.P.: this is over, sometimes we've got to read file's fnode for eas
 190  *            inode numbers are just fnode sector numbers; iget lock is used
 191  *            to tell read_inode to read fnode or not.
 192  */
 193
 194 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
 195 {
 196         const unsigned char *name = dentry->d_name.name;
 197         unsigned len = dentry->d_name.len;
 198         struct quad_buffer_head qbh;
 199         struct hpfs_dirent *de;
 200         ino_t ino;
 201         int err;
 202         struct inode *result = NULL;
 203         struct hpfs_inode_info *hpfs_result;
 204
 205         hpfs_lock(dir->i_sb);
 206         if ((err = hpfs_chk_name(name, &len))) {
 207                 if (err == -ENAMETOOLONG) {
 208                         hpfs_unlock(dir->i_sb);
 209                         return ERR_PTR(-ENAMETOOLONG);
 210                 }
 211                 goto end_add;
 212         }
 213
 214         /*
 215          * '.' and '..' will never be passed here.
 216          */
 217
 218         de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh);
 219
 220         /*
 221          * This is not really a bailout, just means file not found.
 222          */
 223
 224         if (!de) goto end;
 225
 226         /*
 227          * Get inode number, what we're after.
 228          */
 229
 230         ino = le32_to_cpu(de->fnode);
 231
 232         /*
 233          * Go find or make an inode.
 234          */
 235
 236         result = iget_locked(dir->i_sb, ino);
 237         if (!result) {
 238                 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
 239                 goto bail1;
 240         }
 241         if (result->i_state & I_NEW) {
 242                 hpfs_init_inode(result);
 243                 if (de->directory)
 244                         hpfs_read_inode(result);
 245                 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas)
 246                         hpfs_read_inode(result);
 247                 else {
 248                         result->i_mode |= S_IFREG;
 249                         result->i_mode &= ~0111;
 250                         result->i_op = &hpfs_file_iops;
 251                         result->i_fop = &hpfs_file_ops;
 252                         set_nlink(result, 1);
 253                 }
 254                 unlock_new_inode(result);
 255         }
 256         hpfs_result = hpfs_i(result);
 257         if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
 258
 259         if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
 260                 hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures");
 261                 goto bail1;
 262         }
 263
 264         /*
 265          * Fill in the info from the directory if this is a newly created
 266          * inode.
 267          */
 268
 269         if (!result->i_ctime.tv_sec) {
 270                 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date))))
 271                         result->i_ctime.tv_sec = 1;
 272                 result->i_ctime.tv_nsec = 0;
 273                 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date));
 274                 result->i_mtime.tv_nsec = 0;
 275                 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date));
 276                 result->i_atime.tv_nsec = 0;
 277                 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size);
 278                 if (!hpfs_result->i_ea_mode && de->read_only)
 279                         result->i_mode &= ~0222;
 280                 if (!de->directory) {
 281                         if (result->i_size == -1) {
 282                                 result->i_size = le32_to_cpu(de->file_size);
 283                                 result->i_data.a_ops = &hpfs_aops;
 284                                 hpfs_i(result)->mmu_private = result->i_size;
 285                         /*
 286                          * i_blocks should count the fnode and any anodes.
 287                          * We count 1 for the fnode and don't bother about
 288                          * anodes -- the disk heads are on the directory band
 289                          * and we want them to stay there.
 290                          */
 291                                 result->i_blocks = 1 + ((result->i_size + 511) >> 9);
 292                         }
 293                 }
 294         }
 295
 296         hpfs_brelse4(&qbh);
 297
 298         /*
 299          * Made it.
 300          */
 301
 302         end:
 303         end_add:
 304         hpfs_unlock(dir->i_sb);
 305         d_add(dentry, result);
 306         return NULL;
 307
 308         /*
 309          * Didn't.
 310          */
 311         bail1:
 312
 313         hpfs_brelse4(&qbh);
 314
 315         /*bail:*/
 316
 317         hpfs_unlock(dir->i_sb);
 318         return ERR_PTR(-ENOENT);
 319 }
 320
 321 const struct file_operations hpfs_dir_ops =
 322 {
 323         .llseek         = hpfs_dir_lseek,
 324         .read           = generic_read_dir,
 325         .readdir        = hpfs_readdir,
 326         .release        = hpfs_dir_release,
 327         .fsync          = hpfs_file_fsync,
 328 };