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 "hpfs_fn.h"
   10 #include <linux/sched.h>
   11 #include <linux/smp_lock.h>
   12 
   13 int hpfs_dir_release(struct inode *inode, struct file *filp)
   14 {
   15         lock_kernel();
   16         hpfs_del_pos(inode, &filp->f_pos);
   17         /*hpfs_write_if_changed(inode);*/
   18         unlock_kernel();
   19         return 0;
   20 }
   21 
   22 /* This is slow, but it's not used often */
   23 
   24 loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
   25 {
   26         loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
   27         loff_t pos;
   28         struct quad_buffer_head qbh;
   29         struct inode *i = filp->f_dentry->d_inode;
   30         struct super_block *s = i->i_sb;
   31         /*printk("dir lseek\n");*/
   32         if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
   33         hpfs_lock_inode(i);
   34         pos = ((loff_t) hpfs_de_as_down_as_possible(s, i->i_hpfs_dno) << 4) + 1;
   35         while (pos != new_off) {
   36                 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
   37                 else goto fail;
   38                 if (pos == 12) goto fail;
   39         }
   40         hpfs_unlock_inode(i);
   41         ok:
   42         return filp->f_pos = new_off;
   43         fail:
   44         hpfs_unlock_inode(i);
   45         /*printk("illegal lseek: %016llx\n", new_off);*/
   46         return -ESPIPE;
   47 }
   48 
   49 int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
   50 {
   51         struct inode *inode = filp->f_dentry->d_inode;
   52         struct quad_buffer_head qbh;
   53         struct hpfs_dirent *de;
   54         int lc;
   55         long old_pos;
   56         char *tempname;
   57         int c1, c2 = 0;
   58 
   59         if (inode->i_sb->s_hpfs_chk) {
   60                 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode"))
   61                         return -EFSERROR;
   62                 if (hpfs_chk_sectors(inode->i_sb, inode->i_hpfs_dno, 4, "dir_dnode"))
   63                         return -EFSERROR;
   64         }
   65         if (inode->i_sb->s_hpfs_chk >= 2) {
   66                 struct buffer_head *bh;
   67                 struct fnode *fno;
   68                 int e = 0;
   69                 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh)))
   70                         return -EIOERROR;
   71                 if (!fno->dirflag) {
   72                         e = 1;
   73                         hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
   74                 }
   75                 if (inode->i_hpfs_dno != fno->u.external[0].disk_secno) {
   76                         e = 1;
   77                         hpfs_error(inode->i_sb, "corrupted inode: i_hpfs_dno == %08x, fnode -> dnode == %08x", inode->i_hpfs_dno, fno->u.external[0].disk_secno);
   78                 }
   79                 brelse(bh);
   80                 if (e) return -EFSERROR;
   81         }
   82         lc = inode->i_sb->s_hpfs_lowercase;
   83         if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
   84                 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
   85                 return 0;
   86         }
   87         if (filp->f_pos == 13) return -ENOENT;
   88         
   89         hpfs_lock_inode(inode);
   90         
   91         while (1) {
   92                 again:
   93                 /* This won't work when cycle is longer than number of dirents
   94                    accepted by filldir, but what can I do?
   95                    maybe killall -9 ls helps */
   96                 if (inode->i_sb->s_hpfs_chk)
   97                         if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
   98                                 hpfs_unlock_inode(inode);
   99                                 return -EFSERROR;
  100                         }
  101                 if (filp->f_pos == 12) {
  102                         hpfs_unlock_inode(inode);
  103                         return 0;
  104                 }
  105                 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
  106                         printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
  107                         hpfs_unlock_inode(inode);
  108                         return 0;
  109                 }
  110                 if (filp->f_pos == 0) {
  111                         if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) {
  112                                 hpfs_unlock_inode(inode);
  113                                 return 0;
  114                         }
  115                         filp->f_pos = 11;
  116                 }
  117                 if (filp->f_pos == 11) {
  118                         if (filldir(dirent, "..", 2, filp->f_pos, inode->i_hpfs_parent_dir, DT_DIR) < 0) {
  119                                 hpfs_unlock_inode(inode);
  120                                 return 0;
  121                         }
  122                         filp->f_pos = 1;
  123                 }
  124                 if (filp->f_pos == 1) {
  125                         filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, inode->i_hpfs_dno) << 4) + 1;
  126                         hpfs_add_pos(inode, &filp->f_pos);
  127                         filp->f_version = inode->i_version;
  128                 }
  129                         /*if (filp->f_version != inode->i_version) {
  130                                 hpfs_unlock_inode(inode);
  131                                 return -ENOENT;
  132                         }*/     
  133                         old_pos = filp->f_pos;
  134                         if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
  135                                 hpfs_unlock_inode(inode);
  136                                 return -EIOERROR;
  137                         }
  138                         if (de->first || de->last) {
  139                                 if (inode->i_sb->s_hpfs_chk) {
  140                                         if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08x", old_pos);
  141                                         if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos);
  142                                 }
  143                                 hpfs_brelse4(&qbh);
  144                                 goto again;
  145                         }
  146                         tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
  147                         if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
  148                                 filp->f_pos = old_pos;
  149                                 if (tempname != (char *)de->name) kfree(tempname);
  150                                 hpfs_brelse4(&qbh);
  151                                 hpfs_unlock_inode(inode);
  152                                 return 0;
  153                         }
  154                         if (tempname != (char *)de->name) kfree(tempname);
  155                         hpfs_brelse4(&qbh);
  156         }
  157 }
  158 
  159 /*
  160  * lookup.  Search the specified directory for the specified name, set
  161  * *result to the corresponding inode.
  162  *
  163  * lookup uses the inode number to tell read_inode whether it is reading
  164  * the inode of a directory or a file -- file ino's are odd, directory
  165  * ino's are even.  read_inode avoids i/o for file inodes; everything
  166  * needed is up here in the directory.  (And file fnodes are out in
  167  * the boondocks.)
  168  *
  169  *    - M.P.: this is over, sometimes we've got to read file's fnode for eas
  170  *            inode numbers are just fnode sector numbers; iget lock is used
  171  *            to tell read_inode to read fnode or not.
  172  */
  173 
  174 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry)
  175 {
  176         const char *name = dentry->d_name.name;
  177         unsigned len = dentry->d_name.len;
  178         struct quad_buffer_head qbh;
  179         struct hpfs_dirent *de;
  180         ino_t ino;
  181         int err;
  182         struct inode *result = NULL;
  183 
  184         if ((err = hpfs_chk_name((char *)name, &len))) {
  185                 if (err == -ENAMETOOLONG) return ERR_PTR(-ENAMETOOLONG);
  186                 goto end_add;
  187         }
  188 
  189         hpfs_lock_inode(dir);
  190         /*
  191          * '.' and '..' will never be passed here.
  192          */
  193 
  194         de = map_dirent(dir, dir->i_hpfs_dno, (char *) name, len, NULL, &qbh);
  195 
  196         /*
  197          * This is not really a bailout, just means file not found.
  198          */
  199 
  200         if (!de) goto end;
  201 
  202         /*
  203          * Get inode number, what we're after.
  204          */
  205 
  206         ino = de->fnode;
  207 
  208         /*
  209          * Go find or make an inode.
  210          */
  211 
  212         hpfs_lock_iget(dir->i_sb, de->directory || (de->ea_size && dir->i_sb->s_hpfs_eas) ? 1 : 2);
  213         if (!(result = iget(dir->i_sb, ino))) {
  214                 hpfs_unlock_iget(dir->i_sb);
  215                 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
  216                 goto bail1;
  217         }
  218         if (!de->directory) result->i_hpfs_parent_dir = dir->i_ino;
  219         hpfs_unlock_iget(dir->i_sb);
  220 
  221         hpfs_decide_conv(result, (char *)name, len);
  222 
  223         if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
  224                 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");
  225                 goto bail1;
  226         }
  227 
  228         /*
  229          * Fill in the info from the directory if this is a newly created
  230          * inode.
  231          */
  232 
  233         if (!result->i_ctime) {
  234                 if (!(result->i_ctime = local_to_gmt(dir->i_sb, de->creation_date)))
  235                         result->i_ctime = 1;
  236                 result->i_mtime = local_to_gmt(dir->i_sb, de->write_date);
  237                 result->i_atime = local_to_gmt(dir->i_sb, de->read_date);
  238                 result->i_hpfs_ea_size = de->ea_size;
  239                 if (!result->i_hpfs_ea_mode && de->read_only)
  240                         result->i_mode &= ~0222;
  241                 if (!de->directory) {
  242                         if (result->i_size == -1) {
  243                                 result->i_size = de->file_size;
  244                                 result->i_data.a_ops = &hpfs_aops;
  245                                 result->u.hpfs_i.mmu_private = result->i_size;
  246                         /*
  247                          * i_blocks should count the fnode and any anodes.
  248                          * We count 1 for the fnode and don't bother about
  249                          * anodes -- the disk heads are on the directory band
  250                          * and we want them to stay there.
  251                          */
  252                                 result->i_blocks = 1 + ((result->i_size + 511) >> 9);
  253                         }
  254                 }
  255         }
  256 
  257         hpfs_brelse4(&qbh);
  258 
  259         /*
  260          * Made it.
  261          */
  262 
  263         end:
  264         hpfs_unlock_inode(dir);
  265         end_add:
  266         hpfs_set_dentry_operations(dentry);
  267         d_add(dentry, result);
  268         return NULL;
  269 
  270         /*
  271          * Didn't.
  272          */
  273         bail1:
  274         
  275         hpfs_brelse4(&qbh);
  276         
  277         /*bail:*/
  278 
  279         hpfs_unlock_inode(dir);
  280         return ERR_PTR(-ENOENT);
  281 }
Cache object: c148cf82c43a7164898fb76bb83a2beb
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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/dir.c

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