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    Subject[PATCH 22/64] fscache: Provide read/write stat counters for the cache
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    Provide read/write stat counters for the cache backend to use.

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

    fs/fscache/stats.c | 9 +++++++++
    include/linux/fscache-cache.h | 10 ++++++++++
    2 files changed, 19 insertions(+)

    diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
    index cdbb672a274f..db42beb1ba3f 100644
    --- a/fs/fscache/stats.c
    +++ b/fs/fscache/stats.c
    @@ -35,6 +35,11 @@ atomic_t fscache_n_relinquishes;
    atomic_t fscache_n_relinquishes_retire;
    atomic_t fscache_n_relinquishes_dropped;

    +atomic_t fscache_n_read;
    +EXPORT_SYMBOL(fscache_n_read);
    +atomic_t fscache_n_write;
    +EXPORT_SYMBOL(fscache_n_write);
    +
    /*
    * display the general statistics
    */
    @@ -72,6 +77,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
    atomic_read(&fscache_n_relinquishes_retire),
    atomic_read(&fscache_n_relinquishes_dropped));

    + seq_printf(m, "IO : rd=%u wr=%u\n",
    + atomic_read(&fscache_n_read),
    + atomic_read(&fscache_n_write));
    +
    netfs_stats_show(m);
    return 0;
    }
    diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
    index 5525df056877..1398b71539ae 100644
    --- a/include/linux/fscache-cache.h
    +++ b/include/linux/fscache-cache.h
    @@ -179,4 +179,14 @@ static inline void fscache_wait_for_objects(struct fscache_cache *cache)
    atomic_read(&cache->object_count) == 0);
    }

    +#ifdef CONFIG_FSCACHE_STATS
    +extern atomic_t fscache_n_read;
    +extern atomic_t fscache_n_write;
    +#define fscache_count_read() atomic_inc(&fscache_n_read)
    +#define fscache_count_write() atomic_inc(&fscache_n_write)
    +#else
    +#define fscache_count_read() do {} while(0)
    +#define fscache_count_write() do {} while(0)
    +#endif
    +
    #endif /* _LINUX_FSCACHE_CACHE_H */

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