pseudofs_internal.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  *      $FreeBSD$
   31  */
   32 
   33 #ifndef _PSEUDOFS_INTERNAL_H_INCLUDED
   34 #define _PSEUDOFS_INTERNAL_H_INCLUDED
   35 
   36 /*
   37  * Sysctl subtree
   38  */
   39 SYSCTL_DECL(_vfs_pfs);
   40 
   41 /*
   42  * Vnode data
   43  */
   44 struct pfs_vdata {
   45         struct pfs_node *pvd_pn;
   46         pid_t            pvd_pid;
   47         struct vnode    *pvd_vnode;
   48         struct pfs_vdata*pvd_prev, *pvd_next;
   49         int              pvd_dead:1;
   50 };
   51 
   52 /*
   53  * Vnode cache
   54  */
   55 void     pfs_vncache_load       (void);
   56 void     pfs_vncache_unload     (void);
   57 int      pfs_vncache_alloc      (struct mount *, struct vnode **,
   58                                  struct pfs_node *, pid_t pid);
   59 int      pfs_vncache_free       (struct vnode *);
   60 
   61 /*
   62  * File number bitmap
   63  */
   64 void     pfs_fileno_init        (struct pfs_info *);
   65 void     pfs_fileno_uninit      (struct pfs_info *);
   66 void     pfs_fileno_alloc       (struct pfs_node *);
   67 void     pfs_fileno_free        (struct pfs_node *);
   68 
   69 /*
   70  * Debugging
   71  */
   72 #ifdef PSEUDOFS_TRACE
   73 extern int pfs_trace;
   74 
   75 #define PFS_TRACE(foo) \
   76         do { \
   77                 if (pfs_trace) { \
   78                         printf("%s(): line %d: ", __func__, __LINE__); \
   79                         printf foo ; \
   80                         printf("\n"); \
   81                 } \
   82         } while (0)
   83 #define PFS_RETURN(err) \
   84         do { \
   85                 if (pfs_trace) { \
   86                         printf("%s(): line %d: returning %d\n", \
   87                             __func__, __LINE__, err); \
   88                 } \
   89                 return (err); \
   90         } while (0)
   91 #else
   92 #define PFS_TRACE(foo) \
   93         do { /* nothing */ } while (0)
   94 #define PFS_RETURN(err) \
   95         return (err)
   96 #endif
   97 
   98 /*
   99  * Inline helpers for locking
  100  */
  101 static inline void
  102 pfs_lock(struct pfs_node *pn)
  103 {
  104 
  105         mtx_lock(&pn->pn_mutex);
  106 }
  107 
  108 static inline void
  109 pfs_unlock(struct pfs_node *pn)
  110 {
  111 
  112         mtx_unlock(&pn->pn_mutex);
  113 }
  114 
  115 static inline void
  116 pfs_assert_owned(struct pfs_node *pn)
  117 {
  118 
  119         mtx_assert(&pn->pn_mutex, MA_OWNED);
  120 }
  121 
  122 static inline void
  123 pfs_assert_not_owned(struct pfs_node *pn)
  124 {
  125 
  126         mtx_assert(&pn->pn_mutex, MA_NOTOWNED);
  127 }
  128 
  129 static inline int
  130 pn_fill(PFS_FILL_ARGS)
  131 {
  132 
  133         PFS_TRACE(("%s", pn->pn_name));
  134         KASSERT(pn->pn_fill != NULL, ("%s(): no callback", __func__));
  135         if (p != NULL) {
  136                 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  137                 PROC_ASSERT_HELD(p);
  138         }
  139         pfs_assert_not_owned(pn);
  140         return ((pn->pn_fill)(PFS_FILL_ARGNAMES));
  141 }
  142 
  143 static inline int
  144 pn_attr(PFS_ATTR_ARGS)
  145 {
  146 
  147         PFS_TRACE(("%s", pn->pn_name));
  148         KASSERT(pn->pn_attr != NULL, ("%s(): no callback", __func__));
  149         if (p != NULL)
  150                 PROC_LOCK_ASSERT(p, MA_OWNED);
  151         pfs_assert_not_owned(pn);
  152         return ((pn->pn_attr)(PFS_ATTR_ARGNAMES));
  153 }
  154 
  155 static inline int
  156 pn_vis(PFS_VIS_ARGS)
  157 {
  158 
  159         PFS_TRACE(("%s", pn->pn_name));
  160         KASSERT(pn->pn_vis != NULL, ("%s(): no callback", __func__));
  161         KASSERT(p != NULL, ("%s(): no process", __func__));
  162         PROC_LOCK_ASSERT(p, MA_OWNED);
  163         pfs_assert_not_owned(pn);
  164         return ((pn->pn_vis)(PFS_VIS_ARGNAMES));
  165 }
  166 
  167 static inline int
  168 pn_ioctl(PFS_IOCTL_ARGS)
  169 {
  170 
  171         PFS_TRACE(("%s", pn->pn_name));
  172         KASSERT(pn->pn_ioctl != NULL, ("%s(): no callback", __func__));
  173         if (p != NULL)
  174                 PROC_LOCK_ASSERT(p, MA_OWNED);
  175         pfs_assert_not_owned(pn);
  176         return ((pn->pn_ioctl)(PFS_IOCTL_ARGNAMES));
  177 }
  178 
  179 static inline int
  180 pn_getextattr(PFS_GETEXTATTR_ARGS)
  181 {
  182 
  183         PFS_TRACE(("%s", pn->pn_name));
  184         KASSERT(pn->pn_getextattr != NULL, ("%s(): no callback", __func__));
  185         if (p != NULL)
  186                 PROC_LOCK_ASSERT(p, MA_OWNED);
  187         pfs_assert_not_owned(pn);
  188         return ((pn->pn_getextattr)(PFS_GETEXTATTR_ARGNAMES));
  189 }
  190 
  191 static inline int
  192 pn_close(PFS_CLOSE_ARGS)
  193 {
  194 
  195         PFS_TRACE(("%s", pn->pn_name));
  196         KASSERT(pn->pn_close != NULL, ("%s(): no callback", __func__));
  197         if (p != NULL)
  198                 PROC_LOCK_ASSERT(p, MA_OWNED);
  199         pfs_assert_not_owned(pn);
  200         return ((pn->pn_close)(PFS_CLOSE_ARGNAMES));
  201 }
  202 
  203 static inline int
  204 pn_destroy(PFS_DESTROY_ARGS)
  205 {
  206 
  207         PFS_TRACE(("%s", pn->pn_name));
  208         KASSERT(pn->pn_destroy != NULL, ("%s(): no callback", __func__));
  209         pfs_assert_not_owned(pn);
  210         return ((pn->pn_destroy)(PFS_DESTROY_ARGNAMES));
  211 }
  212 
  213 #endif

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

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