lib/libpuffs/puffs_priv.h

   1 /*      $NetBSD: puffs_priv.h,v 1.44 2011/06/20 09:11:17 mrg Exp $      */
   2
   3 /*
   4  * Copyright (c) 2006, 2007, 2008 Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #ifndef _PUFFS_PRIVATE_H_
  29 #define _PUFFS_PRIVATE_H_
  30
  31 #include <sys/types.h>
  32 #include <vfs/puffs/puffs_msgif.h>
  33
  34 #include <pthread.h>
  35 #include <ucontext.h>
  36
  37 #include "puffs.h"
  38
  39 extern pthread_mutex_t pu_lock;
  40 #define PU_LOCK() pthread_mutex_lock(&pu_lock)
  41 #define PU_UNLOCK() pthread_mutex_unlock(&pu_lock)
  42
  43 #define PU_CMAP(pu, c) (pu->pu_cmap ? pu->pu_cmap(pu,c) : (struct puffs_node*)c)
  44
  45 struct puffs_framectrl {
  46         puffs_framev_readframe_fn rfb;
  47         puffs_framev_writeframe_fn wfb;
  48         puffs_framev_cmpframe_fn cmpfb;
  49         puffs_framev_gotframe_fn gotfb;
  50         puffs_framev_fdnotify_fn fdnotfn;
  51 };
  52
  53 struct puffs_fctrl_io {
  54         struct puffs_framectrl *fctrl;
  55
  56         int io_fd;
  57         int stat;
  58
  59         int rwait;
  60         int wwait;
  61
  62         struct puffs_framebuf *cur_in;
  63
  64         TAILQ_HEAD(, puffs_framebuf) snd_qing;  /* queueing to be sent */
  65         TAILQ_HEAD(, puffs_framebuf) res_qing;  /* q'ing for rescue */
  66         LIST_HEAD(, puffs_fbevent) ev_qing;     /* q'ing for events */
  67
  68         LIST_ENTRY(puffs_fctrl_io) fio_entries;
  69 };
  70 #define FIO_WR          0x01
  71 #define FIO_WRGONE      0x02
  72 #define FIO_RDGONE      0x04
  73 #define FIO_DEAD        0x08
  74 #define FIO_ENABLE_R    0x10
  75 #define FIO_ENABLE_W    0x20
  76
  77 #define FIO_EN_WRITE(fio)                               \
  78     (!(fio->stat & FIO_WR)                              \
  79       && ((!TAILQ_EMPTY(&fio->snd_qing)                 \
  80             && (fio->stat & FIO_ENABLE_W))              \
  81          || fio->wwait))
  82
  83 #define FIO_RM_WRITE(fio)                       \
  84     ((fio->stat & FIO_WR)                       \
  85       && (((TAILQ_EMPTY(&fio->snd_qing)         \
  86         || (fio->stat & FIO_ENABLE_W) == 0))    \
  87         && (fio->wwait == 0)))
  88
  89
  90 /*
  91  * usermount: describes one file system instance
  92  */
  93 struct puffs_usermount {
  94         struct puffs_ops        pu_ops;
  95
  96         int                     pu_fd;
  97         size_t                  pu_maxreqlen;
  98
  99         uint32_t                pu_flags;
 100         int                     pu_cc_stackshift;
 101
 102         ucontext_t              pu_mainctx;
 103 #define PUFFS_CCMAXSTORE 32
 104         int                     pu_cc_nstored;
 105
 106         int                     pu_kq;
 107         int                     pu_state;
 108 #define PU_STATEMASK    0x00ff
 109 #define PU_INLOOP       0x0100
 110 #define PU_ASYNCFD      0x0200
 111 #define PU_HASKQ        0x0400
 112 #define PU_PUFFSDAEMON  0x0800
 113 #define PU_MAINRESTORE  0x1000
 114 #define PU_DONEXIT      0x2000
 115 #define PU_SETSTATE(pu, s) (pu->pu_state = (s) | (pu->pu_state & ~PU_STATEMASK))
 116 #define PU_SETSFLAG(pu, s) (pu->pu_state |= (s))
 117 #define PU_CLRSFLAG(pu, s) \
 118     (pu->pu_state = ((pu->pu_state & ~(s)) | (pu->pu_state & PU_STATEMASK)))
 119         int                     pu_dpipe[2];
 120
 121         struct puffs_node       *pu_pn_root;
 122
 123         LIST_HEAD(, puffs_node) pu_pnodelst;
 124
 125         LIST_HEAD(, puffs_cc)   pu_ccmagazin;
 126         TAILQ_HEAD(, puffs_cc)  pu_lazyctx;
 127         TAILQ_HEAD(, puffs_cc)  pu_sched;
 128
 129         pu_cmap_fn              pu_cmap;
 130
 131         pu_pathbuild_fn         pu_pathbuild;
 132         pu_pathtransform_fn     pu_pathtransform;
 133         pu_pathcmp_fn           pu_pathcmp;
 134         pu_pathfree_fn          pu_pathfree;
 135         pu_namemod_fn           pu_namemod;
 136
 137         pu_errnotify_fn         pu_errnotify;
 138
 139         pu_prepost_fn           pu_oppre;
 140         pu_prepost_fn           pu_oppost;
 141
 142         struct puffs_framectrl  pu_framectrl[2];
 143 #define PU_FRAMECTRL_FS   0
 144 #define PU_FRAMECTRL_USER 1
 145         LIST_HEAD(, puffs_fctrl_io) pu_ios;
 146         LIST_HEAD(, puffs_fctrl_io) pu_ios_rmlist;
 147         struct kevent           *pu_evs;
 148         size_t                  pu_nevs;
 149
 150         puffs_ml_loop_fn        pu_ml_lfn;
 151         struct timespec         pu_ml_timeout;
 152         struct timespec         *pu_ml_timep;
 153
 154         struct puffs_kargs      *pu_kargp;
 155
 156         uint64_t                pu_nextreq;
 157         void                    *pu_privdata;
 158 };
 159
 160 /* call context */
 161
 162 struct puffs_cc;
 163 typedef void (*puffs_ccfunc)(struct puffs_cc *);
 164
 165 struct puffs_cc {
 166         struct puffs_usermount  *pcc_pu;
 167         struct puffs_framebuf   *pcc_pb;
 168
 169         /* real cc */
 170         union {
 171                 struct {
 172                         ucontext_t      uc;             /* "continue"   */
 173                         ucontext_t      uc_ret;         /* "yield"      */
 174                 } real;
 175                 struct {
 176                         puffs_ccfunc    func;
 177                         void            *farg;
 178                 } fake;
 179         } pcc_u;
 180
 181         pid_t                   pcc_pid;
 182         lwpid_t                 pcc_lid;
 183
 184         int                     pcc_flags;
 185
 186         TAILQ_ENTRY(puffs_cc)   pcc_schedent;
 187         LIST_ENTRY(puffs_cc)    pcc_rope;
 188 };
 189 #define pcc_uc          pcc_u.real.uc
 190 #define pcc_uc_ret      pcc_u.real.uc_ret
 191 #define pcc_func        pcc_u.fake.func
 192 #define pcc_farg        pcc_u.fake.farg
 193 #define PCC_DONE        0x01
 194 #define PCC_BORROWED    0x02
 195 #define PCC_HASCALLER   0x04
 196 #define PCC_MLCONT      0x08
 197
 198 struct puffs_newinfo {
 199         void            **pni_cookie;
 200         enum vtype      *pni_vtype;
 201         voff_t          *pni_size;
 202 };
 203
 204 #define PUFFS_MAKEKCRED(to, from)                                       \
 205         /*LINTED: tnilxnaht, the cast is ok */                          \
 206         const struct puffs_kcred *to = (const void *)from
 207 #define PUFFS_MAKECRED(to, from)                                        \
 208         /*LINTED: tnilxnaht, the cast is ok */                          \
 209         const struct puffs_cred *to = (const void *)from
 210 #define PUFFS_KCREDTOCRED(to, from)                                     \
 211         /*LINTED: tnilxnaht, the cast is ok */                          \
 212         to = (void *)from
 213
 214 __BEGIN_DECLS
 215
 216 void    puffs__framev_input(struct puffs_usermount *, struct puffs_framectrl *,
 217                            struct puffs_fctrl_io *);
 218 int     puffs__framev_output(struct puffs_usermount *, struct puffs_framectrl*,
 219                             struct puffs_fctrl_io *);
 220 void    puffs__framev_exit(struct puffs_usermount *);
 221 void    puffs__framev_readclose(struct puffs_usermount *,
 222                                struct puffs_fctrl_io *, int);
 223 void    puffs__framev_writeclose(struct puffs_usermount *,
 224                                 struct puffs_fctrl_io *, int);
 225 void    puffs__framev_notify(struct puffs_fctrl_io *, int);
 226 void    *puffs__framebuf_getdataptr(struct puffs_framebuf *);
 227 int     puffs__framev_addfd_ctrl(struct puffs_usermount *, int, int,
 228                                  struct puffs_framectrl *);
 229 void    puffs__framebuf_moveinfo(struct puffs_framebuf *,
 230                                  struct puffs_framebuf *);
 231
 232 void    puffs__theloop(struct puffs_cc *);
 233 void    puffs__ml_dispatch(struct puffs_usermount *, struct puffs_framebuf *);
 234
 235 int     puffs__cc_create(struct puffs_usermount *, puffs_ccfunc,
 236                          struct puffs_cc **);
 237 void    puffs__cc_cont(struct puffs_cc *);
 238 void    puffs__cc_destroy(struct puffs_cc *, int);
 239 void    puffs__cc_setcaller(struct puffs_cc *, pid_t, lwpid_t);
 240 void    puffs__goto(struct puffs_cc *);
 241 int     puffs__cc_savemain(struct puffs_usermount *);
 242 int     puffs__cc_restoremain(struct puffs_usermount *);
 243 void    puffs__cc_exit(struct puffs_usermount *);
 244
 245 int     puffs__fsframe_read(struct puffs_usermount *, struct puffs_framebuf *,
 246                             int, int *);
 247 int     puffs__fsframe_write(struct puffs_usermount *, struct puffs_framebuf *,
 248                             int, int *);
 249 int     puffs__fsframe_cmp(struct puffs_usermount *, struct puffs_framebuf *,
 250                            struct puffs_framebuf *, int *);
 251 void    puffs__fsframe_gotframe(struct puffs_usermount *,
 252                                 struct puffs_framebuf *);
 253
 254 uint64_t        puffs__nextreq(struct puffs_usermount *pu);
 255
 256 __END_DECLS
 257
 258 #endif /* _PUFFS_PRIVATE_H_ */