[sheepdog] [PATCH v3] try to set RLIMIT_NOFILE to recommended value

[Vasiliy Tolstov]

Signed-off-by: Vasiliy Tolstov <v.tolstov at selfip.ru>
---
 sheep/sheep.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/sheep/sheep.c b/sheep/sheep.c
index fc53ec9..45d364f 100644
--- a/sheep/sheep.c
+++ b/sheep/sheep.c
@@ -522,21 +522,27 @@ static int create_work_queues(void)
 
 static void check_host_env(void)
 {
-	struct rlimit r;
-
-	if (getrlimit(RLIMIT_NOFILE, &r) < 0)
-		sd_err("failed to get nofile %m");
-	/*
-	 * 1024 is default for NOFILE on most distributions, which is very
-	 * dangerous to run Sheepdog cluster.
-	 */
-	else if (r.rlim_cur == 1024)
-		sd_warn("Allowed open files 1024 too small, suggested %u",
-			SD_RLIM_NOFILE);
-	else if (r.rlim_cur < SD_RLIM_NOFILE)
-		sd_info("Allowed open files %lu, suggested %u", r.rlim_cur,
-			SD_RLIM_NOFILE);
+	struct rlimit r;
+	int ret;
+
+	ret = getrlimit(RLIMIT_NOFILE, &r);
+	if (ret < 0) {
+		sd_err("failed to getrlimit");
+	} else {
+		if (r.rlim_cur < SD_RLIM_NOFILE) {
+			sd_warn("Allowed open files %lu, suggested %u",
+				r.rlim_cur, SD_RLIM_NOFILE);
+			r.rlim_cur = SD_RLIM_NOFILE;
+			r.rlim_max = SD_RLIM_NOFILE;
+			if (setrlimit(RLIMIT_NOFILE, &r) != 0) {
+				sd_warn("Failed to set open files limit to suggested %lu",
+					r.rlim_cur);
+			} else {
+				sd_info("Allowed open files set to suggested %lu",
+					r.rlim_cur);
+			}
+		}
+	}
 
 	if (getrlimit(RLIMIT_CORE, &r) < 0)
 		sd_debug("failed to get core %m");
-- 
2.2.2