On Wed, Mar 25, 2009 at 07:06:28PM +0530, Krishna Kumar wrote:
> From: Krishna Kumar <krkumar2@xxxxxxxxxx>
>
> ADD infrastructure in terms of new structures.
>
> Signed-off-by: Krishna Kumar <krkumar2@xxxxxxxxxx>
> ---
>
> fs/nfsd/vfs.c | 35 +++++++++++++++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
>
> diff -ruNp org/fs/nfsd/vfs.c new1/fs/nfsd/vfs.c
> --- org/fs/nfsd/vfs.c 2009-03-25 17:31:39.000000000 +0530
> +++ new1/fs/nfsd/vfs.c 2009-03-25 17:39:43.000000000 +0530
> @@ -88,6 +88,41 @@ struct raparm_hbucket {
> #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
> static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
>
> +/*
> + * This is a cache of file handles to quicken file lookup. This also
> + * helps prevent multiple open/close of a file when a client reads it.
> + *
> + * If you increase the number of cached files very much, you'll need to
> + * add a hash table here.
> + */
> +struct fhcache {
> + struct fhcache *p_next;
> +
> + /* Hashed on this parameter */
> + __u32 p_auth;
> +
> + /* Cached information */
> + struct file *p_filp;
> + struct svc_export *p_exp;
> +
> + /* Refcount for overwrite */
> + atomic_t p_count;
> +
> + /* When this entry expires */
> + unsigned long p_expires;
> +
> + unsigned int p_hindex;
> +};
> +
> +struct fhcache_hbucket {
> + struct fhcache *pb_head;
> + spinlock_t pb_lock;
> +} ____cacheline_aligned_in_smp;
Hadn't run across __cacheline_aligned_in_smp before--so that just
assures an fhcache_hbucket gets its own cacheline, so that two cpu's
taking the spinlock on different buckets won't be fighting over the
cacheline?
--b.
> +
> +#define FHPARM_HASH_BITS 8
> +#define FHPARM_HASH_SIZE (1<<FHPARM_HASH_BITS)
> +#define FHPARM_HASH_MASK (FHPARM_HASH_SIZE-1)
> +
> /*
> * Called from nfsd_lookup and encode_dirent. Check if we have crossed
> * a mount point.
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