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NFSv4: Optimise away forced revalidation when we know the attributes are OK 

The NFS_INO_REVAL_FORCED flag needs to be set if we just got a delegation,
and we see that there might still be some ambiguity as to whether or not
our attribute or data cache are valid.
In practice, this means that a call to nfs_check_inode_attributes() will
have noticed a discrepancy between cached attributes and measured ones,
so let's move the setting of NFS_INO_REVAL_FORCED to there.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-10-27 18:42:04 -04:00
parent 3ecefc9295
commit 1ad13dbc85
2 changed files with 1 additions and 5 deletions
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4
fs/nfs/delegation.c
View File

@ -391,10 +391,6 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
rcu_assign_pointer(nfsi->delegation, delegation);
delegation = NULL;
/* Ensure we revalidate the attributes and page cache! */
spin_lock(&inode->i_lock);
nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
spin_unlock(&inode->i_lock);
trace_nfs4_set_delegation(inode, res->delegation_type);
out:

2
fs/nfs/inode.c
View File

@ -1317,7 +1317,7 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
invalid |= NFS_INO_INVALID_ATIME;
if (invalid != 0)
nfs_set_cache_invalid(inode, invalid);
nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
nfsi->read_cache_jiffies = fattr->time_start;
return 0;