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         SLIST_ENTRY(pfs_vdata) pvd_hash;
   49 };
   50 
   51 /*
   52  * Vnode cache
   53  */
   54 void     pfs_vncache_load       (void);
   55 void     pfs_vncache_unload     (void);
   56 int      pfs_vncache_alloc      (struct mount *, struct vnode **,
   57                                  struct pfs_node *, pid_t pid);
   58 int      pfs_vncache_free       (struct vnode *);
   59 
   60 /*
   61  * File number bitmap
   62  */
   63 void     pfs_fileno_init        (struct pfs_info *);
   64 void     pfs_fileno_uninit      (struct pfs_info *);
   65 void     pfs_fileno_alloc       (struct pfs_node *);
   66 void     pfs_fileno_free        (struct pfs_node *);
   67 
   68 /*
   69  * Debugging
   70  */
   71 #ifdef PSEUDOFS_TRACE
   72 extern int pfs_trace;
   73 
   74 #define PFS_TRACE(foo) \
   75         do { \
   76                 if (pfs_trace) { \
   77                         printf("%s(): line %d: ", __func__, __LINE__); \
   78                         printf foo ; \
   79                         printf("\n"); \
   80                 } \
   81         } while (0)
   82 #define PFS_RETURN(err) \
   83         do { \
   84                 if (pfs_trace) { \
   85                         printf("%s(): line %d: returning %d\n", \
   86                             __func__, __LINE__, err); \
   87                 } \
   88                 return (err); \
   89         } while (0)
   90 #else
   91 #define PFS_TRACE(foo) \
   92         do { /* nothing */ } while (0)
   93 #define PFS_RETURN(err) \
   94         return (err)
   95 #endif
   96 
   97 /*
   98  * Inline helpers for locking
   99  */
  100 static inline void
  101 pfs_lock(struct pfs_node *pn)
  102 {
  103 
  104         mtx_lock(&pn->pn_mutex);
  105 }
  106 
  107 static inline void
  108 pfs_unlock(struct pfs_node *pn)
  109 {
  110 
  111         mtx_unlock(&pn->pn_mutex);
  112 }
  113 
  114 static inline void
  115 pfs_assert_owned(struct pfs_node *pn)
  116 {
  117 
  118         mtx_assert(&pn->pn_mutex, MA_OWNED);
  119 }
  120 
  121 static inline void
  122 pfs_assert_not_owned(struct pfs_node *pn)
  123 {
  124 
  125         mtx_assert(&pn->pn_mutex, MA_NOTOWNED);
  126 }
  127 
  128 static inline int
  129 pn_fill(PFS_FILL_ARGS)
  130 {
  131 
  132         PFS_TRACE(("%s", pn->pn_name));
  133         KASSERT(pn->pn_fill != NULL, ("%s(): no callback", __func__));
  134         if (p != NULL) {
  135                 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  136                 PROC_ASSERT_HELD(p);
  137         }
  138         pfs_assert_not_owned(pn);
  139         return ((pn->pn_fill)(PFS_FILL_ARGNAMES));
  140 }
  141 
  142 static inline int
  143 pn_attr(PFS_ATTR_ARGS)
  144 {
  145 
  146         PFS_TRACE(("%s", pn->pn_name));
  147         KASSERT(pn->pn_attr != NULL, ("%s(): no callback", __func__));
  148         if (p != NULL)
  149                 PROC_LOCK_ASSERT(p, MA_OWNED);
  150         pfs_assert_not_owned(pn);
  151         return ((pn->pn_attr)(PFS_ATTR_ARGNAMES));
  152 }
  153 
  154 static inline int
  155 pn_vis(PFS_VIS_ARGS)
  156 {
  157 
  158         PFS_TRACE(("%s", pn->pn_name));
  159         KASSERT(pn->pn_vis != NULL, ("%s(): no callback", __func__));
  160         KASSERT(p != NULL, ("%s(): no process", __func__));
  161         PROC_LOCK_ASSERT(p, MA_OWNED);
  162         pfs_assert_not_owned(pn);
  163         return ((pn->pn_vis)(PFS_VIS_ARGNAMES));
  164 }
  165 
  166 static inline int
  167 pn_ioctl(PFS_IOCTL_ARGS)
  168 {
  169 
  170         PFS_TRACE(("%s", pn->pn_name));
  171         KASSERT(pn->pn_ioctl != NULL, ("%s(): no callback", __func__));
  172         if (p != NULL)
  173                 PROC_LOCK_ASSERT(p, MA_OWNED);
  174         pfs_assert_not_owned(pn);
  175         return ((pn->pn_ioctl)(PFS_IOCTL_ARGNAMES));
  176 }
  177 
  178 static inline int
  179 pn_getextattr(PFS_GETEXTATTR_ARGS)
  180 {
  181 
  182         PFS_TRACE(("%s", pn->pn_name));
  183         KASSERT(pn->pn_getextattr != NULL, ("%s(): no callback", __func__));
  184         if (p != NULL)
  185                 PROC_LOCK_ASSERT(p, MA_OWNED);
  186         pfs_assert_not_owned(pn);
  187         return ((pn->pn_getextattr)(PFS_GETEXTATTR_ARGNAMES));
  188 }
  189 
  190 static inline int
  191 pn_close(PFS_CLOSE_ARGS)
  192 {
  193 
  194         PFS_TRACE(("%s", pn->pn_name));
  195         KASSERT(pn->pn_close != NULL, ("%s(): no callback", __func__));
  196         if (p != NULL)
  197                 PROC_LOCK_ASSERT(p, MA_OWNED);
  198         pfs_assert_not_owned(pn);
  199         return ((pn->pn_close)(PFS_CLOSE_ARGNAMES));
  200 }
  201 
  202 static inline int
  203 pn_destroy(PFS_DESTROY_ARGS)
  204 {
  205 
  206         PFS_TRACE(("%s", pn->pn_name));
  207         KASSERT(pn->pn_destroy != NULL, ("%s(): no callback", __func__));
  208         pfs_assert_not_owned(pn);
  209         return ((pn->pn_destroy)(PFS_DESTROY_ARGNAMES));
  210 }
  211 
  212 #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