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net/smc: retain old name for diag_mode field

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Commit c601171d7a ("net/smc: provide smc mode in smc_diag.c") changed
the name of diag_fallback field of struct smc_diag_msg structure
to diag_mode.  However, this structure is a part of UAPI, and this change
breaks user space applications that use it ([1], for example).  Since
the new name is more suitable, convert the field to a union that provides
access to the data via both the new and the old name.

[1] https://gitlab.com/strace/strace/blob/v4.24/netlink_smc_diag.c#L165

Fixes: c601171d7a ("net/smc: provide smc mode in smc_diag.c")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eugene Syromiatnikov 2018-10-07 16:57:37 +02:00 committed by David S. Miller
parent a21048c8ec
commit d4f0006a08
1 changed files with 4 additions and 1 deletions
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5
include/uapi/linux/smc_diag.h
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@ -20,7 +20,10 @@ struct smc_diag_req {
struct smc_diag_msg {
__u8 diag_family;
__u8 diag_state;
__u8 diag_mode;
union {
__u8 diag_mode;
__u8 diag_fallback; /* the old name of the field */
};
__u8 diag_shutdown;
struct inet_diag_sockid id;