ubifs: Abort readdir upon error

If UBIFS is facing an error while walking a directory, it reports this
error and ubifs_readdir() returns the error code. But the VFS readdir
logic does not make the getdents system call fail in all cases. When the
readdir cursor indicates that more entries are present, the system call
will just return and the libc wrapper will try again since it also
knows that more entries are present.
This causes the libc wrapper to busy loop for ever when a directory is
corrupted on UBIFS.
A common approach do deal with corrupted directory entries is
skipping them by setting the cursor to the next entry. On UBIFS this
approach is not possible since we cannot compute the next directory
entry cursor position without reading the current entry. So all we can
do is setting the cursor to the "no more entries" position and make
getdents exit.

Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>

path: root/corking.h

#ifndef CORKING_H
#define CORKING_H

#include <stdbool.h>

extern void set_tcp_cork(int fd);
extern void set_tcp_uncork(int fd);
extern void set_udp_cork(int fd);
extern void set_udp_uncork(int fd);
extern void set_sock_cork(int fd, bool is_udp);
extern void set_sock_uncork(int fd, bool is_udp);

#endif /* CORKING_H */