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-rw-r--r--Documentation/kernel-parameters.txt4
-rw-r--r--fs/nfs/idmap.c9
-rw-r--r--fs/nfs/inode.c14
-rw-r--r--fs/nfs/sysctl.c10
-rw-r--r--include/linux/nfs_idmap.h2
5 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 309c9cec6e7..a482fde09bb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -914,6 +914,10 @@ running once the system is up.
[NFS] set the TCP port on which the NFSv4 callback
channel should listen.
+ nfs.idmap_cache_timeout=
+ [NFS] set the maximum lifetime for idmapper cache
+ entries.
+
nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels
no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index ffb8df91dc3..821edd30333 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -54,7 +54,11 @@
#define IDMAP_HASH_SZ 128
+/* Default cache timeout is 10 minutes */
+unsigned int nfs_idmap_cache_timeout = 600 * HZ;
+
struct idmap_hashent {
+ unsigned long ih_expires;
__u32 ih_id;
int ih_namelen;
char ih_name[IDMAP_NAMESZ];
@@ -149,6 +153,8 @@ idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len)
if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0)
return NULL;
+ if (time_after(jiffies, he->ih_expires))
+ return NULL;
return he;
}
@@ -164,6 +170,8 @@ idmap_lookup_id(struct idmap_hashtable *h, __u32 id)
struct idmap_hashent *he = idmap_id_hash(h, id);
if (he->ih_id != id || he->ih_namelen == 0)
return NULL;
+ if (time_after(jiffies, he->ih_expires))
+ return NULL;
return he;
}
@@ -192,6 +200,7 @@ idmap_update_entry(struct idmap_hashent *he, const char *name,
memcpy(he->ih_name, name, namelen);
he->ih_name[namelen] = '\0';
he->ih_namelen = namelen;
+ he->ih_expires = jiffies + nfs_idmap_cache_timeout;
}
/*
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 4625479a6b6..e7bd0d92600 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -2050,6 +2050,20 @@ static int param_set_port(const char *val, struct kernel_param *kp)
module_param_call(callback_tcpport, param_set_port, param_get_int,
&nfs_callback_set_tcpport, 0644);
+static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
+{
+ char *endp;
+ int num = simple_strtol(val, &endp, 0);
+ int jif = num * HZ;
+ if (endp == val || *endp || num < 0 || jif < num)
+ return -EINVAL;
+ *((int *)kp->arg) = jif;
+ return 0;
+}
+
+module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
+ &nfs_idmap_cache_timeout, 0644);
+
#define nfs4_init_once(nfsi) \
do { \
INIT_LIST_HEAD(&(nfsi)->open_states); \
diff --git a/fs/nfs/sysctl.c b/fs/nfs/sysctl.c
index fdc64b59a4e..4c486eb867c 100644
--- a/fs/nfs/sysctl.c
+++ b/fs/nfs/sysctl.c
@@ -11,6 +11,7 @@
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/nfs4.h>
+#include <linux/nfs_idmap.h>
#include "callback.h"
@@ -35,6 +36,15 @@ static ctl_table nfs_cb_sysctls[] = {
.extra1 = (int *)&nfs_set_port_min,
.extra2 = (int *)&nfs_set_port_max,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "idmap_cache_timeout",
+ .data = &nfs_idmap_cache_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
#endif
{ .ctl_name = 0 }
};
diff --git a/include/linux/nfs_idmap.h b/include/linux/nfs_idmap.h
index a0f1f25e0ea..102e5609429 100644
--- a/include/linux/nfs_idmap.h
+++ b/include/linux/nfs_idmap.h
@@ -71,6 +71,8 @@ int nfs_map_name_to_uid(struct nfs4_client *, const char *, size_t, __u32 *);
int nfs_map_group_to_gid(struct nfs4_client *, const char *, size_t, __u32 *);
int nfs_map_uid_to_name(struct nfs4_client *, __u32, char *);
int nfs_map_gid_to_group(struct nfs4_client *, __u32, char *);
+
+extern unsigned int nfs_idmap_cache_timeout;
#endif /* __KERNEL__ */
#endif /* NFS_IDMAP_H */