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    Subject[PATCH 25/26] NFS: Display local caching state
    Date
    Display the local caching state in /proc/fs/nfsfs/volumes.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    fs/nfs/client.c | 7 ++++---
    fs/nfs/fscache.h | 15 +++++++++++++++
    2 files changed, 19 insertions(+), 3 deletions(-)


    diff --git a/fs/nfs/client.c b/fs/nfs/client.c
    index 92f9b84..68d3124 100644
    --- a/fs/nfs/client.c
    +++ b/fs/nfs/client.c
    @@ -1335,7 +1335,7 @@ static int nfs_volume_list_show(struct seq_file *m, void *v)

    /* display header on line 1 */
    if (v == &nfs_volume_list) {
    - seq_puts(m, "NV SERVER PORT DEV FSID\n");
    + seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
    return 0;
    }
    /* display one transport per line on subsequent lines */
    @@ -1349,12 +1349,13 @@ static int nfs_volume_list_show(struct seq_file *m, void *v)
    (unsigned long long) server->fsid.major,
    (unsigned long long) server->fsid.minor);

    - seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
    + seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s %s\n",
    clp->cl_nfsversion,
    NIPQUAD(clp->cl_addr.sin_addr),
    ntohs(clp->cl_addr.sin_port),
    dev,
    - fsid);
    + fsid,
    + nfs_server_fscache_state(server));

    return 0;
    }
    diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
    index 144fb58..9a735fc 100644
    --- a/fs/nfs/fscache.h
    +++ b/fs/nfs/fscache.h
    @@ -53,6 +53,17 @@ extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
    extern int nfs_fscache_release_page(struct page *, gfp_t);

    /*
    + * indicate the client caching state as readable text
    + */
    +static inline const char *nfs_server_fscache_state(struct nfs_server *server)
    +{
    + if (server->nfs_client->fscache &&
    + (server->options & NFS_OPTION_FSCACHE))
    + return "yes";
    + return "no ";
    +}
    +
    +/*
    * release the caching state associated with a page if undergoing complete page
    * invalidation
    */
    @@ -109,6 +120,10 @@ static inline void nfs4_fscache_get_client_cookie(struct nfs_client *clp) {}
    static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
    static inline void nfs_fscache_show_stats(struct seq_file *m,
    struct nfs_server *nfss) {}
    +static inline const char *nfs_server_fscache_state(struct nfs_server *server)
    +{
    + return "no ";
    +}

    static inline void nfs_fscache_init_fh_cookie(struct inode *inode) {}
    static inline void nfs_fscache_enable_fh_cookie(struct inode *inode) {}


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