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NFSv4: Ignore change attribute invalidations if we hold a delegation 

Don't bother even recording an invalid change attribute if we hold a
delegation since we already know the state of our attribute cache.
We can rely on the fact that we will pick up a copy from the server
when we return the delegation.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2018-03-20 16:53:32 -04:00 committed by Anna Schumaker
parent 16e1437517
commit d943f2dd8d
1 changed files with 3 additions and 0 deletions
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3
fs/nfs/inode.c
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@ -200,7 +200,10 @@ bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
{ {
struct nfs_inode *nfsi = NFS_I(inode); struct nfs_inode *nfsi = NFS_I(inode);
bool have_delegation = nfs_have_delegated_attributes(inode);
if (have_delegation)
flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
if (inode->i_mapping->nrpages == 0) if (inode->i_mapping->nrpages == 0)
flags &= ~NFS_INO_INVALID_DATA; flags &= ~NFS_INO_INVALID_DATA;
nfsi->cache_validity |= flags; nfsi->cache_validity |= flags;