FreeBSD/Linux Kernel Cross Reference
sys/fs/pseudofs/pseudofs_internal.h

     /*-
      * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer
     *    in this position and unchanged.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *      $FreeBSD$
     */
    
    #ifndef _PSEUDOFS_INTERNAL_H_INCLUDED
    #define _PSEUDOFS_INTERNAL_H_INCLUDED
    
    /*
     * Sysctl subtree
     */
    SYSCTL_DECL(_vfs_pfs);
    
    /*
     * Vnode data
     */
    struct pfs_vdata {
            struct pfs_node *pvd_pn;
            pid_t            pvd_pid;
            struct vnode    *pvd_vnode;
            struct pfs_vdata*pvd_prev, *pvd_next;
            int              pvd_dead:1;
    };
    
    /*
     * Vnode cache
     */
    void     pfs_vncache_load       (void);
    void     pfs_vncache_unload     (void);
    int      pfs_vncache_alloc      (struct mount *, struct vnode **,
                                     struct pfs_node *, pid_t pid);
    int      pfs_vncache_free       (struct vnode *);
    
    /*
     * File number bitmap
     */
    void     pfs_fileno_init        (struct pfs_info *);
    void     pfs_fileno_uninit      (struct pfs_info *);
    void     pfs_fileno_alloc       (struct pfs_node *);
    void     pfs_fileno_free        (struct pfs_node *);
    
    /*
     * Debugging
     */
    #ifdef PSEUDOFS_TRACE
    extern int pfs_trace;
    
    #define PFS_TRACE(foo) \
            do { \
                    if (pfs_trace) { \
                            printf("%s(): line %d: ", __func__, __LINE__); \
                            printf foo ; \
                            printf("\n"); \
                    } \
            } while (0)
    #define PFS_RETURN(err) \
            do { \
                    if (pfs_trace) { \
                            printf("%s(): line %d: returning %d\n", \
                                __func__, __LINE__, err); \
                    } \
                    return (err); \
            } while (0)
    #else
    #define PFS_TRACE(foo) \
            do { /* nothing */ } while (0)
    #define PFS_RETURN(err) \
            return (err)
    #endif
    
    /*
     * Inline helpers for locking
     */
    static inline void
   pfs_lock(struct pfs_node *pn)
   {
   
           mtx_lock(&pn->pn_mutex);
   }
   
   static inline void
   pfs_unlock(struct pfs_node *pn)
   {
   
           mtx_unlock(&pn->pn_mutex);
   }
   
   static inline void
   pfs_assert_owned(struct pfs_node *pn)
   {
   
           mtx_assert(&pn->pn_mutex, MA_OWNED);
   }
   
   static inline void
   pfs_assert_not_owned(struct pfs_node *pn)
   {
   
           mtx_assert(&pn->pn_mutex, MA_NOTOWNED);
   }
   
   static inline int
   pn_fill(PFS_FILL_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_fill != NULL, ("%s(): no callback", __func__));
           if (p != NULL) {
                   PROC_LOCK_ASSERT(p, MA_NOTOWNED);
                   PROC_ASSERT_HELD(p);
           }
           pfs_assert_not_owned(pn);
           return ((pn->pn_fill)(PFS_FILL_ARGNAMES));
   }
   
   static inline int
   pn_attr(PFS_ATTR_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_attr != NULL, ("%s(): no callback", __func__));
           if (p != NULL)
                   PROC_LOCK_ASSERT(p, MA_OWNED);
           pfs_assert_not_owned(pn);
           return ((pn->pn_attr)(PFS_ATTR_ARGNAMES));
   }
   
   static inline int
   pn_vis(PFS_VIS_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_vis != NULL, ("%s(): no callback", __func__));
           KASSERT(p != NULL, ("%s(): no process", __func__));
           PROC_LOCK_ASSERT(p, MA_OWNED);
           pfs_assert_not_owned(pn);
           return ((pn->pn_vis)(PFS_VIS_ARGNAMES));
   }
   
   static inline int
   pn_ioctl(PFS_IOCTL_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_ioctl != NULL, ("%s(): no callback", __func__));
           if (p != NULL)
                   PROC_LOCK_ASSERT(p, MA_OWNED);
           pfs_assert_not_owned(pn);
           return ((pn->pn_ioctl)(PFS_IOCTL_ARGNAMES));
   }
   
   static inline int
   pn_getextattr(PFS_GETEXTATTR_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_getextattr != NULL, ("%s(): no callback", __func__));
           if (p != NULL)
                   PROC_LOCK_ASSERT(p, MA_OWNED);
           pfs_assert_not_owned(pn);
           return ((pn->pn_getextattr)(PFS_GETEXTATTR_ARGNAMES));
   }
   
   static inline int
   pn_close(PFS_CLOSE_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_close != NULL, ("%s(): no callback", __func__));
           if (p != NULL)
                   PROC_LOCK_ASSERT(p, MA_OWNED);
           pfs_assert_not_owned(pn);
           return ((pn->pn_close)(PFS_CLOSE_ARGNAMES));
   }
   
   static inline int
   pn_destroy(PFS_DESTROY_ARGS)
   {
   
           PFS_TRACE(("%s", pn->pn_name));
           KASSERT(pn->pn_destroy != NULL, ("%s(): no callback", __func__));
           pfs_assert_not_owned(pn);
           return ((pn->pn_destroy)(PFS_DESTROY_ARGNAMES));
   }
   
   #endif

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