/* based on generic filldir in fs/readir.c */
static int unionfs_filldir(void *dirent, const char *oname, int namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct unionfs_getdents_callback *buf = dirent;
struct filldir_node *found = NULL;
int err = 0;
int is_whiteout;
char *name = (char *) oname;
buf->filldir_called++;
is_whiteout = is_whiteout_name(&name, &namelen);
found = find_filldir_node(buf->rdstate, name, namelen, is_whiteout);
if (found) {
/*
* If we had non-whiteout entry in dir cache, then mark it
* as a whiteout and but leave it in the dir cache.
*/
if (is_whiteout && !found->whiteout)
found->whiteout = is_whiteout;
goto out;
}
/* if 'name' isn't a whiteout, filldir it. */
if (!is_whiteout) {
off_t pos = rdstate2offset(buf->rdstate);
u64 unionfs_ino = ino;
err = buf->filldir(buf->dirent, name, namelen, pos,
unionfs_ino, d_type);
buf->rdstate->offset++;
verify_rdstate_offset(buf->rdstate);
}
/*
* If we did fill it, stuff it in our hash, otherwise return an
* error.
*/
if (err) {
buf->filldir_error = err;
goto out;
}
buf->entries_written++;
err = add_filldir_node(buf->rdstate, name, namelen,
buf->rdstate->bindex, is_whiteout);
if (err)
buf->filldir_error = err;
out:
return err;
}
/* This filldir function makes sure only whiteouts exist within a directory. */
static int readdir_util_callback(void *dirent, const char *oname, int namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
int err = 0;
struct unionfs_rdutil_callback *buf = dirent;
int is_whiteout;
struct filldir_node *found;
char *name = (char *) oname;
buf->filldir_called = 1;
if (name[0] == '.' && (namelen == 1 ||
(name[1] == '.' && namelen == 2)))
goto out;
is_whiteout = is_whiteout_name(&name, &namelen);
found = find_filldir_node(buf->rdstate, name, namelen, is_whiteout);
/* If it was found in the table there was a previous whiteout. */
if (found)
goto out;
/*
* if it wasn't found and isn't a whiteout, the directory isn't
* empty.
*/
err = -ENOTEMPTY;
if ((buf->mode == RD_CHECK_EMPTY) && !is_whiteout)
goto out;
err = add_filldir_node(buf->rdstate, name, namelen,
buf->rdstate->bindex, is_whiteout);
out:
buf->err = err;
return err;
}
