nfsd: last_byte_offset

refactor the nfs4 server lock code to use last_byte_offset
to compute the last byte covered by the lock.  Check for overflow
so that the last byte is set to NFS4_MAX_UINT64 if offset + len
wraps around.

Also, use NFS4_MAX_UINT64 for ~(u64)0 where appropriate.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index ea0366769484..b912311a56b1 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -88,6 +88,8 @@
 #define NFS4_ACE_GENERIC_EXECUTE              0x001200A0
 #define NFS4_ACE_MASK_ALL                     0x001F01FF
 
+#define NFS4_MAX_UINT64 (~(u64)0)
+
 enum nfs4_acl_whotype {
         NFS4_ACL_WHO_NAMED = 0,
         NFS4_ACL_WHO_OWNER,