dir.c

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

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/dir.c
