#ifndef _UAPI_GENERIC_STATFS_H
#define _UAPI_GENERIC_STATFS_H

#include <linux/types.h>


/*
 * Most 64-bit platforms use 'long', while most 32-bit platforms use '__u32'.
 * Yes, they differ in signedness as well as size.
 * Special cases can override it for themselves -- except for S390x, which
 * is just a little too special for us. And MIPS, which I'm not touching
 * with a 10' pole.
 */
#ifndef __statfs_word
#if __BITS_PER_LONG == 64
#define __statfs_word __kernel_long_t
#else
#define __statfs_word __u32
#endif
#endif

struct statfs {
	__statfs_word f_type;
	__statfs_word f_bsize;
	__statfs_word f_blocks;
	__statfs_word f_bfree;
	__statfs_word f_bavail;
	__statfs_word f_files;
	__statfs_word f_ffree;
	__kernel_fsid_t f_fsid;
	__statfs_word f_namelen;
	__statfs_word f_frsize;
	__statfs_word f_flags;
	__statfs_word f_spare[4];
};

/*
 * ARM needs to avoid the 32-bit padding at the end, for consistency
 * between EABI and OABI 
 */
#ifndef ARCH_PACK_STATFS64
#define ARCH_PACK_STATFS64
#endif

struct statfs64 {
	__statfs_word f_type;
	__statfs_word f_bsize;
	__u64 f_blocks;
	__u64 f_bfree;
	__u64 f_bavail;
	__u64 f_files;
	__u64 f_ffree;
	__kernel_fsid_t f_fsid;
	__statfs_word f_namelen;
	__statfs_word f_frsize;
	__statfs_word f_flags;
	__statfs_word f_spare[4];
} ARCH_PACK_STATFS64;

/* 
 * IA64 and x86_64 need to avoid the 32-bit padding at the end,
 * to be compatible with the i386 ABI
 */
#ifndef ARCH_PACK_COMPAT_STATFS64
#define ARCH_PACK_COMPAT_STATFS64
#endif

struct compat_statfs64 {
	__u32 f_type;
	__u32 f_bsize;
	__u64 f_blocks;
	__u64 f_bfree;
	__u64 f_bavail;
	__u64 f_files;
	__u64 f_ffree;
	__kernel_fsid_t f_fsid;
	__u32 f_namelen;
	__u32 f_frsize;
	__u32 f_flags;
	__u32 f_spare[4];
} ARCH_PACK_COMPAT_STATFS64;

#endif /* _UAPI_GENERIC_STATFS_H */
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<tr class='logheader'><td><span title='2017-02-04 19:58:14 -0500'>2017-02-04</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ip6_fib.h?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5'>net: ipv6: Allow shorthand delete of all nexthops in multipath route</a></td><td>David Ahern</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+3</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
IPv4 allows multipath routes to be deleted using just the prefix and
length. For example:
    $ ip ro ls vrf red
    unreachable default metric 8192
    1.1.1.0/24
        nexthop via 10.100.1.254  dev eth1 weight 1
        nexthop via 10.11.200.2  dev eth11.200 weight 1
    10.11.200.0/24 dev eth11.200 proto kernel scope link src 10.11.200.3
    10.100.1.0/24 dev eth1 proto kernel scope link src 10.100.1.3

    $ ip ro del 1.1.1.0/24 vrf red

    $ ip ro ls vrf red
    unreachable default metric 8192
    10.11.200.0/24 dev eth11.200 proto kernel scope link src 10.11.200.3
    10.100.1.0/24 dev eth1 proto kernel scope link src 10.100.1.3

The same notation does not work with IPv6 because of how multipath routes
are implemented for IPv6. For IPv6 only the first nexthop of a multipath
route is deleted if the request contains only a prefix and length. This
leads to unnecessary complexity in userspace dealing with IPv6 multipath
routes.

This patch allows all nexthops to be deleted without specifying each one
in the delete request. Internally, this is done by walking the sibling
list of the route matching the specifications given (prefix, length,
metric, protocol, etc).

    $  ip -6 ro ls vrf red
    2001:db8:1::/120 dev eth1 proto kernel metric 256  pref medium
    2001:db8:2::/120 dev eth2 proto kernel metric 256  pref medium
    2001:db8:200::/120 via 2001:db8:1::2 dev eth1 metric 1024  pref medium
    2001:db8:200::/120 via 2001:db8:2::2 dev eth2 metric 1024  pref medium
    ...

    $ ip -6 ro del vrf red 2001:db8:200::/120

    $ ip -6 ro ls vrf red
    2001:db8:1::/120 dev eth1 proto kernel metric 256  pref medium
    2001:db8:2::/120 dev eth2 proto kernel metric 256  pref medium
    ...

Because IPv6 allows individual nexthops to be deleted without deleting
the entire route, the ip6_route_multipath_del and non-multipath code
path (ip6_route_del) have to be discriminated so that all nexthops are
only deleted for the latter case. This is done by making the existing
fc_type in fib6_config a u16 and then adding a new u16 field with
fc_delete_all_nh as the first bit.

Suggested-by: Dinesh Dutt &lt;ddutt@cumulusnetworks.com&gt;
Signed-off-by: David Ahern &lt;dsa@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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