static int do_open_dir(struct file *file, int flags)
{
int err;
aufs_bindex_t bindex, btail;
struct dentry *dentry, *h_dentry;
struct file *h_file;
FiMustWriteLock(file);
dentry = file->f_dentry;
err = au_alive_dir(dentry);
if (unlikely(err))
goto out;
file->f_version = dentry->d_inode->i_version;
bindex = au_dbstart(dentry);
au_set_fbstart(file, bindex);
btail = au_dbtaildir(dentry);
au_set_fbend_dir(file, btail);
for (; !err && bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
h_file = au_h_open(dentry, bindex, flags, file);
if (IS_ERR(h_file)) {
err = PTR_ERR(h_file);
break;
}
au_set_h_fptr(file, bindex, h_file);
}
au_update_figen(file);
/* todo: necessary? */
/* file->f_ra = h_file->f_ra; */
if (!err)
return 0; /* success */
/* close all */
for (bindex = au_fbstart(file); bindex <= btail; bindex++)
au_set_h_fptr(file, bindex, NULL);
au_set_fbstart(file, -1);
au_set_fbend_dir(file, -1);
out:
return err;
}
static int reopen_dir(struct file *file)
{
int err;
unsigned int flags;
aufs_bindex_t bindex, btail, bstart;
struct dentry *dentry, *h_dentry;
struct file *h_file;
/* open all lower dirs */
dentry = file->f_dentry;
bstart = au_dbstart(dentry);
for (bindex = au_fbstart(file); bindex < bstart; bindex++)
au_set_h_fptr(file, bindex, NULL);
au_set_fbstart(file, bstart);
btail = au_dbtaildir(dentry);
for (bindex = au_fbend_dir(file); btail < bindex; bindex--)
au_set_h_fptr(file, bindex, NULL);
au_set_fbend_dir(file, btail);
flags = vfsub_file_flags(file);
for (bindex = bstart; bindex <= btail; bindex++) {
h_dentry = au_h_dptr(dentry, bindex);
if (!h_dentry)
continue;
h_file = au_hf_dir(file, bindex);
if (h_file)
continue;
h_file = au_h_open(dentry, bindex, flags, file);
err = PTR_ERR(h_file);
if (IS_ERR(h_file))
goto out; /* close all? */
au_set_h_fptr(file, bindex, h_file);
}
au_update_figen(file);
/* todo: necessary? */
/* file->f_ra = h_file->f_ra; */
err = 0;
out:
return err;
}