On Thu, Feb 14, 2013 at 04:45:15PM -0500, Jeff Layton wrote:
> For presenting statistics relating to duplicate reply cache.
Looks to me like a reasonable way to do it. Holding off on applying for
now.
--b.
>
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> fs/nfsd/cache.h | 1 +
> fs/nfsd/nfscache.c | 18 ++++++++++++++++++
> fs/nfsd/nfsctl.c | 9 +++++++++
> 3 files changed, 28 insertions(+)
>
> diff --git a/fs/nfsd/cache.h b/fs/nfsd/cache.h
> index 87fd141..d5c5b3e 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 bccf74f..517b92d 100644
> --- a/fs/nfsd/nfscache.c
> +++ b/fs/nfsd/nfscache.c
> @@ -540,3 +540,21 @@ nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *data)
> vec->iov_len += data->iov_len;
> return 1;
> }
> +
> +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, "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, "checksum misses: %u\n", csum_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 29c3f0d..5dea5af 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,
> @@ -194,6 +195,13 @@ 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
> @@ -1024,6 +1032,7 @@ 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},
> --
> 1.7.11.7
>
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