hpfs: deadlock and race in directory lseek()

[pandora-kernel.git] / fs / hpfs / dir.c

diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index 2fa0089..46549c7 100644 (file)
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -33,25 +33,27 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
        if (whence == SEEK_DATA || whence == SEEK_HOLE)
                return -EINVAL;
 
+       mutex_lock(&i->i_mutex);
        hpfs_lock(s);
 
        /*printk("dir lseek\n");*/
        if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
-       mutex_lock(&i->i_mutex);
        pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1;
        while (pos != new_off) {
                if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
                else goto fail;
                if (pos == 12) goto fail;
        }
-       mutex_unlock(&i->i_mutex);
+       hpfs_add_pos(i, &filp->f_pos);
 ok:
+       filp->f_pos = new_off;
        hpfs_unlock(s);
-       return filp->f_pos = new_off;
-fail:
        mutex_unlock(&i->i_mutex);
+       return new_off;
+fail:
        /*printk("illegal lseek: %016llx\n", new_off);*/
        hpfs_unlock(s);
+       mutex_unlock(&i->i_mutex);
        return -ESPIPE;
 }