autofs-5.1.8 - make open files limit configurable
From: Ian Kent <raven@themaw.net>
autofs can use quite a few file handles, particularly with very large
direct mount maps or many submounts as is often seen with amd maps.
So make the maximum number of open files configurable.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
daemon/automount.c | 13 +++++++------
include/defaults.h | 2 ++
lib/defaults.c | 17 +++++++++++++++++
man/autofs.conf.5.in | 7 +++++++
redhat/autofs.conf.default.in | 11 +++++++++++
samples/autofs.conf.default.in | 11 +++++++++++
7 files changed, 56 insertions(+), 6 deletions(-)
diff --git a/CHANGELOG b/CHANGELOG
index d46a4519..b7ab3591 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -89,6 +89,7 @@
- make submount cleanup the same as top level mounts.
- add soucre parameter to module functions.
- add ioctlfd open helper.
+- make open files limit configurable.
19/10/2021 autofs-5.1.8
- add xdr_exports().
diff --git a/daemon/automount.c b/daemon/automount.c
index ee8e1330..7acb3276 100644
--- a/daemon/automount.c
+++ b/daemon/automount.c
@@ -111,8 +111,6 @@ struct startup_cond suc = {
pthread_key_t key_thread_stdenv_vars;
pthread_key_t key_thread_attempt_id = (pthread_key_t) 0L;
-#define MAX_OPEN_FILES 20480
-
int aquire_flag_file(void);
void release_flag_file(void);
@@ -2240,6 +2238,7 @@ int main(int argc, char *argv[])
time_t timeout;
time_t age = monotonic_time(NULL);
struct rlimit rlim;
+ unsigned long max_open_files;
const char *options = "+hp:t:vmd::D:SfVrO:l:n:P:CFUM:";
static const struct option long_options[] = {
{"help", 0, 0, 'h'},
@@ -2452,11 +2451,13 @@ int main(int argc, char *argv[])
exit(1);
}
+ max_open_files = defaults_get_open_file_limit();
+
res = getrlimit(RLIMIT_NOFILE, &rlim);
- if (res == -1 || rlim.rlim_cur <= MAX_OPEN_FILES) {
- rlim.rlim_cur = MAX_OPEN_FILES;
- if (rlim.rlim_max < MAX_OPEN_FILES)
- rlim.rlim_max = MAX_OPEN_FILES;
+ if (res == -1 || rlim.rlim_cur <= max_open_files) {
+ rlim.rlim_cur = max_open_files;
+ if (rlim.rlim_max < max_open_files)
+ rlim.rlim_max = max_open_files;
}
res = setrlimit(RLIMIT_NOFILE, &rlim);
if (res)
diff --git a/include/defaults.h b/include/defaults.h
index a9db04e5..d1e013ff 100644
--- a/include/defaults.h
+++ b/include/defaults.h
@@ -24,6 +24,7 @@
#define DEFAULT_MASTER_MAP_NAME "auto.master"
+#define DEFAULT_OPEN_FILE_LIMIT "20480"
#define DEFAULT_TIMEOUT "600"
#define DEFAULT_MASTER_WAIT "10"
#define DEFAULT_NEGATIVE_TIMEOUT "60"
@@ -158,6 +159,7 @@ unsigned int defaults_read_config(unsigned int);
void defaults_conf_release(void);
const char *defaults_get_master_map(void);
int defaults_master_set(void);
+unsigned long defaults_get_open_file_limit(void);
unsigned int defaults_get_timeout(void);
int defaults_get_master_wait(void);
unsigned int defaults_get_negative_timeout(void);
diff --git a/lib/defaults.c b/lib/defaults.c
index 5a05680f..2cbb57ac 100644
--- a/lib/defaults.c
+++ b/lib/defaults.c
@@ -47,6 +47,7 @@
#define NAME_MASTER_MAP "master_map_name"
+#define NAME_OPEN_FILE_LIMIT "open_file_limit"
#define NAME_TIMEOUT "timeout"
#define NAME_MASTER_WAIT "master_wait"
#define NAME_NEGATIVE_TIMEOUT "negative_timeout"
@@ -291,6 +292,11 @@ static int conf_load_autofs_defaults(void)
const char *sec = autofs_gbl_sec;
int ret;
+ ret = conf_update(sec, NAME_OPEN_FILE_LIMIT,
+ DEFAULT_OPEN_FILE_LIMIT, CONF_ENV);
+ if (ret == CFG_FAIL)
+ goto error;
+
ret = conf_update(sec, NAME_TIMEOUT,
DEFAULT_TIMEOUT, CONF_ENV);
if (ret == CFG_FAIL)
@@ -1671,6 +1677,17 @@ int defaults_master_set(void)
return 0;
}
+unsigned long defaults_get_open_file_limit(void)
+{
+ long limit;
+
+ limit = conf_get_number(autofs_gbl_sec, NAME_OPEN_FILE_LIMIT);
+ if (limit < 0)
+ limit = atol(DEFAULT_OPEN_FILE_LIMIT);
+
+ return limit;
+}
+
unsigned int defaults_get_timeout(void)
{
long timeout;
diff --git a/man/autofs.conf.5.in b/man/autofs.conf.5.in
index a8d921ab..27fe4a4f 100644
--- a/man/autofs.conf.5.in
+++ b/man/autofs.conf.5.in
@@ -23,6 +23,13 @@ configuration settings.
.P
Configuration settings available are:
.TP
++.B open_file_limit
++.br
++Set the maximum number of open files. Note there may be other limits
++within the system that prevent this from being set, systemd for example
++may need a setting in the unit file to increase its default. The autofs
++default is 20480.
++.TP
.B timeout
.br
Sets the default mount timeout in seconds. The internal program
diff --git a/redhat/autofs.conf.default.in b/redhat/autofs.conf.default.in
index 766878a4..50f50329 100644
--- a/redhat/autofs.conf.default.in
+++ b/redhat/autofs.conf.default.in
@@ -1,4 +1,15 @@
#
+# Global configuration options.
+#
+# open_file_limit - set the maximum number of open files. Note there
+# may be other limits within the system that prevent
+# this from being set, systemd for example may need
+# a setting in the unit file to increase its default.
+# The autofs default is 20480.
+#
+#open_file_limit = 20480
+#
+#
# Define default options for autofs.
#
[ autofs ]
diff --git a/samples/autofs.conf.default.in b/samples/autofs.conf.default.in
index 56240c99..94635203 100644
--- a/samples/autofs.conf.default.in
+++ b/samples/autofs.conf.default.in
@@ -1,4 +1,15 @@
#
+# Global configuration options.
+#
+# open_file_limit - set the maximum number of open files. Note there
+# may be other limits within the system that prevent
+# this from being set, systemd for example may need
+# a setting in the unit file to increase its default.
+# The autofs default is 20480.
+#
+#open_file_limit = 20480
+#
+#
# Define default options for autofs.
#
[ autofs ]