NFSv4.1: Optimise layout return-on-close
Optimise the layout return on close code by ensuring that
1) Add a check for whether we hold a layout before taking any spinlocks
2) Only take the spin lock once
3) Use nfs_state->state to speed up open file checks
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 66befb0..0f75b92 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2714,45 +2714,10 @@
.rpc_release = nfs4_free_closedata,
};
-static bool nfs4_state_has_opener(struct nfs4_state *state)
-{
- /* first check existing openers */
- if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
- state->n_rdonly != 0)
- return true;
-
- if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
- state->n_wronly != 0)
- return true;
-
- if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
- state->n_rdwr != 0)
- return true;
-
- return false;
-}
-
static bool nfs4_roc(struct inode *inode)
{
- struct nfs_inode *nfsi = NFS_I(inode);
- struct nfs_open_context *ctx;
- struct nfs4_state *state;
-
- spin_lock(&inode->i_lock);
- list_for_each_entry(ctx, &nfsi->open_files, list) {
- state = ctx->state;
- if (state == NULL)
- continue;
- if (nfs4_state_has_opener(state)) {
- spin_unlock(&inode->i_lock);
- return false;
- }
- }
- spin_unlock(&inode->i_lock);
-
- if (nfs4_check_delegation(inode, FMODE_READ))
+ if (!nfs_have_layout(inode))
return false;
-
return pnfs_roc(inode);
}