storage.c

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#include <linux/module.h>
#include <linux/slab.h>

#include "storage.h"
#include "cache.h"



struct mumufs_storage *  mumufs_allocate_storage( void )
{
    struct mumufs_storage *        new = kmem_cache_alloc( mumufs_storage_cache,
                                                           GFP_KERNEL );

    if ( new != NULL )
    {
            /* Initialise semaphore. No errors could be here */
        init_rwsem( & new->buffer_lock );

            /* Set buffer to zero                            */
        new->buffer = NULL;
        new->buffer_size = 0;

            /* Initialise buffer version to 0                */
        new->buffer_version = 0;

            /* Initialise a wait queue for the readers       */
        init_waitqueue_head( & new->blocked_readers );
    }

    return new;
}



void mumufs_free_storage( struct mumufs_storage *  element )
{
    if ( element->buffer != NULL )
    {
        kfree( element->buffer );
        element->buffer = NULL;
    }
    kmem_cache_free( mumufs_storage_cache, element );
    return;
}