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authorJeff Layton <jlayton@redhat.com>2013-03-27 10:15:38 -0400
committerJ. Bruce Fields <bfields@redhat.com>2013-04-03 11:47:24 -0400
commita2f999a37ebb77e857d3a178bd6f52d1163cd980 (patch)
tree2319536cbbc8edba7af77de9f1358edea3a289cc /fs/nfsd
parent6c6910cd4d0cdb905fbba8c751afd143696930f2 (diff)
nfsd: add new reply_cache_stats file in nfsdfs
For presenting statistics relating to duplicate reply cache. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/cache.h1
-rw-r--r--fs/nfsd/nfscache.c25
-rw-r--r--fs/nfsd/nfsctl.c9
3 files changed, 35 insertions, 0 deletions
diff --git a/fs/nfsd/cache.h b/fs/nfsd/cache.h
index 87fd1410b737..d5c5b3e00266 100644
--- a/fs/nfsd/cache.h
+++ b/fs/nfsd/cache.h
@@ -82,6 +82,7 @@ int nfsd_reply_cache_init(void);
void nfsd_reply_cache_shutdown(void);
int nfsd_cache_lookup(struct svc_rqst *);
void nfsd_cache_update(struct svc_rqst *, int, __be32 *);
+int nfsd_reply_cache_stats_open(struct inode *, struct file *);
#ifdef CONFIG_NFSD_V4
void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp);
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 1f45b3353bb1..fd81ca79a002 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -556,3 +556,28 @@ nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *data)
vec->iov_len += data->iov_len;
return 1;
}
+
+/*
+ * Note that fields may be added, removed or reordered in the future. Programs
+ * scraping this file for info should test the labels to ensure they're
+ * getting the correct field.
+ */
+static int nfsd_reply_cache_stats_show(struct seq_file *m, void *v)
+{
+ spin_lock(&cache_lock);
+ seq_printf(m, "max entries: %u\n", max_drc_entries);
+ seq_printf(m, "num entries: %u\n", num_drc_entries);
+ seq_printf(m, "hash buckets: %u\n", HASHSIZE);
+ seq_printf(m, "mem usage: %u\n", drc_mem_usage);
+ seq_printf(m, "cache hits: %u\n", nfsdstats.rchits);
+ seq_printf(m, "cache misses: %u\n", nfsdstats.rcmisses);
+ seq_printf(m, "not cached: %u\n", nfsdstats.rcnocache);
+ seq_printf(m, "payload misses: %u\n", payload_misses);
+ spin_unlock(&cache_lock);
+ return 0;
+}
+
+int nfsd_reply_cache_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, nfsd_reply_cache_stats_show, NULL);
+}
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f33455b4d957..a830f33df3ef 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -35,6 +35,7 @@ enum {
NFSD_Threads,
NFSD_Pool_Threads,
NFSD_Pool_Stats,
+ NFSD_Reply_Cache_Stats,
NFSD_Versions,
NFSD_Ports,
NFSD_MaxBlkSize,
@@ -212,6 +213,13 @@ static const struct file_operations pool_stats_operations = {
.owner = THIS_MODULE,
};
+static struct file_operations reply_cache_stats_operations = {
+ .open = nfsd_reply_cache_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
/*----------------------------------------------------------------------------*/
/*
* payload - write methods
@@ -1047,6 +1055,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
+ [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},