[PATCH v3 07/10] nfsdcld: add function to remove unreclaimed client records

[Jeff Layton <jlayton@redhat.com>]

This should remove any client record that has a timestamp prior to
the given time.

Eventually, this call will need to be made cluster aware when this is
run in a clustered configuration. For now, this is only suitable for
single-host configurations.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
 utils/nfsdcld/nfsdcld.c |   29 +++++++++++++++++++++++++++++
 utils/nfsdcld/sqlite.c  |   28 ++++++++++++++++++++++++++++
 utils/nfsdcld/sqlite.h  |    1 +
 3 files changed, 58 insertions(+), 0 deletions(-)

diff --git a/utils/nfsdcld/nfsdcld.c b/utils/nfsdcld/nfsdcld.c
index 29c514c..b66fe39 100644
--- a/utils/nfsdcld/nfsdcld.c
+++ b/utils/nfsdcld/nfsdcld.c
@@ -212,6 +212,32 @@ cld_check(struct cld_client *clnt)
 }
 
 static void
+cld_gracedone(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+	struct cld_msg *cmsg = &clnt->cl_msg;
+
+	xlog(D_GENERAL, "%s: grace done. cm_gracetime=%ld", __func__,
+			cmsg->cm_u.cm_gracetime);
+
+	ret = sqlite_remove_unreclaimed(cmsg->cm_u.cm_gracetime);
+
+	/* set up reply: downcall with 0 status */
+	cmsg->cm_status = ret ? -EREMOTEIO : ret;
+
+	bsize = sizeof(*cmsg);
+
+	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
+			 __func__, wsize);
+		cld_pipe_reopen(clnt);
+	}
+}
+
+static void
 cldcb(int UNUSED(fd), short which, void *data)
 {
 	ssize_t len;
@@ -244,6 +270,9 @@ cldcb(int UNUSED(fd), short which, void *data)
 	case Cld_Allow:
 		cld_check(clnt);
 		break;
+	case Cld_GraceDone:
+		cld_gracedone(clnt);
+		break;
 	default:
 		xlog_warn("%s: command %u is not yet implemented", __func__,
 			  cmsg->cm_cmd);
diff --git a/utils/nfsdcld/sqlite.c b/utils/nfsdcld/sqlite.c
index 6d3c022..61fa448 100644
--- a/utils/nfsdcld/sqlite.c
+++ b/utils/nfsdcld/sqlite.c
@@ -38,6 +38,7 @@
 #include "config.h"
 #endif /* HAVE_CONFIG_H */
 
+#include <dirent.h>
 #include <errno.h>
 #include <event.h>
 #include <stdbool.h>
@@ -355,3 +356,30 @@ out_err:
 	sqlite3_finalize(stmt);
 	return ret;
 }
+
+/*
+ * remove any client records that were not reclaimed since grace_start.
+ */
+int
+sqlite_remove_unreclaimed(time_t grace_start)
+{
+	int ret;
+	char *err = NULL;
+
+	ret = snprintf(buf, sizeof(buf), "DELETE FROM clients WHERE time < %ld",
+			grace_start);
+	if (ret < 0) {
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		ret = -EINVAL;
+		return ret;
+	}
+
+	ret = sqlite3_exec(dbh, buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK)
+		xlog(D_GENERAL, "Delete failed: %s", err);
+
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_free(err);
+	return ret;
+}
diff --git a/utils/nfsdcld/sqlite.h b/utils/nfsdcld/sqlite.h
index 59ebd72..c85e7d6 100644
--- a/utils/nfsdcld/sqlite.h
+++ b/utils/nfsdcld/sqlite.h
@@ -24,5 +24,6 @@ int sqlite_maindb_init(char *topdir);
 int sqlite_insert_client(const unsigned char *clname, const size_t namelen);
 int sqlite_remove_client(const unsigned char *clname, const size_t namelen);
 int sqlite_check_client(const unsigned char *clname, const size_t namelen);
+int sqlite_remove_unreclaimed(const time_t grace_start);
 
 #endif /* _SQLITE_H */
-- 
1.7.1