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| author |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-06-09 12:43:06 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-06-09 12:56:30 -0400 |
| commit | fc40724fc6731d90cc7fb6d62d66135f85a33dd2 (patch) | |
| tree | 791a9c413993091ee07d589e43659ab284c19ae0 /fs/nfs/callback_proc.c | |
| parent | NFSv4: Return NFS4ERR_DELAY when a layout recall fails due to igrab() (diff) | |
| download | linux-dev-fc40724fc6731d90cc7fb6d62d66135f85a33dd2.tar.xz linux-dev-fc40724fc6731d90cc7fb6d62d66135f85a33dd2.zip | |
NFSv4: Revert commit 5f83d86cf531d ("NFSv4.x: Fix wraparound issues..")
The correct behaviour for NFSv4 sequence IDs is to wrap around
to the value 0 after 0xffffffff.
See https://tools.ietf.org/html/rfc5661#section-2.10.6.1
Fixes: 5f83d86cf531d ("NFSv4.x: Fix wraparound issues when validing...")
Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/callback_proc.c')
| -rw-r--r-- | fs/nfs/callback_proc.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index 3a49bb19ef07..ee81031cab29 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -428,11 +428,8 @@ validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, return htonl(NFS4ERR_SEQ_FALSE_RETRY); } - /* Wraparound */ - if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) { - if (args->csa_sequenceid == 1) - return htonl(NFS4_OK); - } else if (likely(args->csa_sequenceid == slot->seq_nr + 1)) + /* Note: wraparound relies on seq_nr being of type u32 */ + if (likely(args->csa_sequenceid == slot->seq_nr + 1)) return htonl(NFS4_OK); /* Misordered request */ |