nfs41: return layout on last close
If client has valid delegation, do not return layout on close at all.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1300013..734f7da 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2655,6 +2655,48 @@
.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))
+ return false;
+
+ return pnfs_roc(inode);
+}
+
/*
* It is possible for data to be read/written from a mem-mapped file
* after the sys_close call (which hits the vfs layer as a flush).
@@ -2705,7 +2747,7 @@
calldata->res.fattr = &calldata->fattr;
calldata->res.seqid = calldata->arg.seqid;
calldata->res.server = server;
- calldata->roc = pnfs_roc(state->inode);
+ calldata->roc = nfs4_roc(state->inode);
nfs_sb_active(calldata->inode->i_sb);
msg.rpc_argp = &calldata->arg;