The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2001 Dag-Erling Co´dan Sm°rgrav
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   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  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  *      $FreeBSD$
   29  */
   30 
   31 #ifndef _PSEUDOFS_H_INCLUDED
   32 #define _PSEUDOFS_H_INCLUDED
   33 
   34 /*
   35  * Opaque structures
   36  */
   37 struct mntarg;
   38 struct mount;
   39 struct nameidata;
   40 struct proc;
   41 struct sbuf;
   42 struct statfs;
   43 struct thread;
   44 struct uio;
   45 struct vfsconf;
   46 struct vnode;
   47 
   48 /*
   49  * Limits and constants
   50  */
   51 #define PFS_NAMELEN             24
   52 #define PFS_FSNAMELEN           16      /* equal to MFSNAMELEN */
   53 #define PFS_DELEN               (8 + PFS_NAMELEN)
   54 
   55 typedef enum {
   56         pfstype_none = 0,
   57         pfstype_root,
   58         pfstype_dir,
   59         pfstype_this,
   60         pfstype_parent,
   61         pfstype_file,
   62         pfstype_symlink,
   63         pfstype_procdir
   64 } pfs_type_t;
   65 
   66 /*
   67  * Flags
   68  */
   69 #define PFS_RD          0x0001  /* readable */
   70 #define PFS_WR          0x0002  /* writeable */
   71 #define PFS_RDWR        (PFS_RD|PFS_WR)
   72 #define PFS_RAWRD       0x0004  /* raw reader */
   73 #define PFS_RAWWR       0x0008  /* raw writer */
   74 #define PFS_RAW         (PFS_RAWRD|PFS_RAWWR)
   75 #define PFS_PROCDEP     0x0010  /* process-dependent */
   76 
   77 /*
   78  * Data structures
   79  */
   80 struct pfs_info;
   81 struct pfs_node;
   82 struct pfs_bitmap;
   83 
   84 /*
   85  * Init / uninit callback
   86  */
   87 #define PFS_INIT_ARGS \
   88         struct pfs_info *pi, struct vfsconf *vfc
   89 #define PFS_INIT_ARGNAMES \
   90         pi, vfc
   91 #define PFS_INIT_PROTO(name) \
   92         int name(PFS_INIT_ARGS);
   93 typedef int (*pfs_init_t)(PFS_INIT_ARGS);
   94 
   95 /*
   96  * Filler callback
   97  * Called with proc held but unlocked
   98  */
   99 #define PFS_FILL_ARGS \
  100         struct thread *td, struct proc *p, struct pfs_node *pn, \
  101         struct sbuf *sb, struct uio *uio
  102 #define PFS_FILL_ARGNAMES \
  103         td, p, pn, sb, uio
  104 #define PFS_FILL_PROTO(name) \
  105         int name(PFS_FILL_ARGS);
  106 typedef int (*pfs_fill_t)(PFS_FILL_ARGS);
  107 
  108 /*
  109  * Attribute callback
  110  * Called with proc locked
  111  */
  112 struct vattr;
  113 #define PFS_ATTR_ARGS \
  114         struct thread *td, struct proc *p, struct pfs_node *pn, \
  115         struct vattr *vap
  116 #define PFS_ATTR_ARGNAMES \
  117         td, p, pn, vap
  118 #define PFS_ATTR_PROTO(name) \
  119         int name(PFS_ATTR_ARGS);
  120 typedef int (*pfs_attr_t)(PFS_ATTR_ARGS);
  121 
  122 struct pfs_bitmap;              /* opaque */
  123 
  124 /*
  125  * Visibility callback
  126  * Called with proc locked
  127  */
  128 #define PFS_VIS_ARGS \
  129         struct thread *td, struct proc *p, struct pfs_node *pn
  130 #define PFS_VIS_ARGNAMES \
  131         td, p, pn
  132 #define PFS_VIS_PROTO(name) \
  133         int name(PFS_VIS_ARGS);
  134 typedef int (*pfs_vis_t)(PFS_VIS_ARGS);
  135 
  136 /*
  137  * Ioctl callback
  138  * Called with proc locked
  139  */
  140 #define PFS_IOCTL_ARGS \
  141         struct thread *td, struct proc *p, struct pfs_node *pn, \
  142         unsigned long cmd, void *data
  143 #define PFS_IOCTL_ARGNAMES \
  144         td, p, pn, cmd, data
  145 #define PFS_IOCTL_PROTO(name) \
  146         int name(PFS_IOCTL_ARGS);
  147 typedef int (*pfs_ioctl_t)(PFS_IOCTL_ARGS);
  148 
  149 /*
  150  * Getextattr callback
  151  * Called with proc locked
  152  */
  153 #define PFS_GETEXTATTR_ARGS \
  154         struct thread *td, struct proc *p, struct pfs_node *pn, \
  155         int attrnamespace, const char *name, struct uio *uio,   \
  156         size_t *size, struct ucred *cred
  157 #define PFS_GETEXTATTR_ARGNAMES \
  158         td, p, pn, attrnamespace, name, uio, size, cred
  159 #define PFS_GETEXTATTR_PROTO(name) \
  160         int name(PFS_GETEXTATTR_ARGS);
  161 struct ucred;
  162 typedef int (*pfs_getextattr_t)(PFS_GETEXTATTR_ARGS);
  163 
  164 /*
  165  * Last-close callback
  166  * Called with proc locked
  167  */
  168 #define PFS_CLOSE_ARGS \
  169         struct thread *td, struct proc *p, struct pfs_node *pn
  170 #define PFS_CLOSE_ARGNAMES \
  171         td, p, pn
  172 #define PFS_CLOSE_PROTO(name) \
  173         int name(PFS_CLOSE_ARGS);
  174 typedef int (*pfs_close_t)(PFS_CLOSE_ARGS);
  175 
  176 /*
  177  * Destroy callback
  178  */
  179 #define PFS_DESTROY_ARGS \
  180         struct pfs_node *pn
  181 #define PFS_DESTROY_ARGNAMES \
  182         pn
  183 #define PFS_DESTROY_PROTO(name) \
  184         int name(PFS_DESTROY_ARGS);
  185 typedef int (*pfs_destroy_t)(PFS_DESTROY_ARGS);
  186 
  187 /*
  188  * pfs_info: describes a pseudofs instance
  189  *
  190  * The pi_mutex is only used to avoid using the global subr_unit lock for
  191  * unrhdr.  The rest of struct pfs_info is only modified while Giant is
  192  * held (during vfs_init() and vfs_uninit()).
  193  */
  194 struct pfs_info {
  195         char                     pi_name[PFS_FSNAMELEN];
  196         pfs_init_t               pi_init;
  197         pfs_init_t               pi_uninit;
  198 
  199         /* members below this line are initialized at run time*/
  200         struct pfs_node         *pi_root;
  201         struct mtx               pi_mutex;
  202         struct unrhdr           *pi_unrhdr;
  203 };
  204 
  205 /*
  206  * pfs_node: describes a node (file or directory) within a pseudofs
  207  *
  208  * - Fields marked (o) are protected by the node's own mutex.
  209  * - Fields marked (p) are protected by the node's parent's mutex.
  210  * - Remaining fields are not protected by any lock and are assumed to be
  211  *   immutable once the node has been created.
  212  *
  213  * To prevent deadlocks, if a node's mutex is to be held at the same time
  214  * as its parent's (e.g. when adding or removing nodes to a directory),
  215  * the parent's mutex must always be acquired first.  Unfortunately, this
  216  * is not enforcable by WITNESS.
  217  */
  218 struct pfs_node {
  219         char                     pn_name[PFS_NAMELEN];
  220         pfs_type_t               pn_type;
  221         int                      pn_flags;
  222         struct mtx               pn_mutex;
  223         void                    *pn_data;               /* (o) */
  224 
  225         pfs_fill_t               pn_fill;
  226         pfs_ioctl_t              pn_ioctl;
  227         pfs_close_t              pn_close;
  228         pfs_attr_t               pn_attr;
  229         pfs_vis_t                pn_vis;
  230         pfs_getextattr_t         pn_getextattr;
  231         pfs_destroy_t            pn_destroy;
  232 
  233         struct pfs_info         *pn_info;
  234         u_int32_t                pn_fileno;             /* (o) */
  235 
  236         struct pfs_node         *pn_parent;             /* (o) */
  237         struct pfs_node         *pn_nodes;              /* (o) */
  238         struct pfs_node         *pn_next;               /* (p) */
  239 };
  240 
  241 /*
  242  * VFS interface
  243  */
  244 int              pfs_mount      (struct pfs_info *pi, struct mount *mp);
  245 int              pfs_cmount     (struct mntarg *ma, void *data, int flags);
  246 int              pfs_unmount    (struct mount *mp, int mntflags);
  247 int              pfs_root       (struct mount *mp, int flags,
  248                                  struct vnode **vpp);
  249 int              pfs_statfs     (struct mount *mp, struct statfs *sbp);
  250 int              pfs_init       (struct pfs_info *pi, struct vfsconf *vfc);
  251 int              pfs_uninit     (struct pfs_info *pi, struct vfsconf *vfc);
  252 
  253 /*
  254  * Directory structure construction and manipulation
  255  */
  256 struct pfs_node *pfs_create_dir (struct pfs_node *parent, const char *name,
  257                                  pfs_attr_t attr, pfs_vis_t vis,
  258                                  pfs_destroy_t destroy, int flags);
  259 struct pfs_node *pfs_create_file(struct pfs_node *parent, const char *name,
  260                                  pfs_fill_t fill, pfs_attr_t attr,
  261                                  pfs_vis_t vis, pfs_destroy_t destroy,
  262                                  int flags);
  263 struct pfs_node *pfs_create_link(struct pfs_node *parent, const char *name,
  264                                  pfs_fill_t fill, pfs_attr_t attr,
  265                                  pfs_vis_t vis, pfs_destroy_t destroy,
  266                                  int flags);
  267 struct pfs_node *pfs_find_node  (struct pfs_node *parent, const char *name);
  268 void             pfs_purge      (struct pfs_node *pn);
  269 int              pfs_destroy    (struct pfs_node *pn);
  270 
  271 /*
  272  * Now for some initialization magic...
  273  */
  274 #define PSEUDOFS(name, version)                                         \
  275                                                                         \
  276 static struct pfs_info name##_info = {                                  \
  277         #name,                                                          \
  278         name##_init,                                                    \
  279         name##_uninit,                                                  \
  280 };                                                                      \
  281                                                                         \
  282 static int                                                              \
  283 _##name##_mount(struct mount *mp) {                                     \
  284         return pfs_mount(&name##_info, mp);                             \
  285 }                                                                       \
  286                                                                         \
  287 static int                                                              \
  288 _##name##_init(struct vfsconf *vfc) {                                   \
  289         return pfs_init(&name##_info, vfc);                             \
  290 }                                                                       \
  291                                                                         \
  292 static int                                                              \
  293 _##name##_uninit(struct vfsconf *vfc) {                                 \
  294         return pfs_uninit(&name##_info, vfc);                           \
  295 }                                                                       \
  296                                                                         \
  297 static struct vfsops name##_vfsops = {                                  \
  298         .vfs_cmount =           pfs_cmount,                             \
  299         .vfs_init =             _##name##_init,                         \
  300         .vfs_mount =            _##name##_mount,                        \
  301         .vfs_root =             pfs_root,                               \
  302         .vfs_statfs =           pfs_statfs,                             \
  303         .vfs_uninit =           _##name##_uninit,                       \
  304         .vfs_unmount =          pfs_unmount,                            \
  305 };                                                                      \
  306 VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC);                           \
  307 MODULE_VERSION(name, version);                                          \
  308 MODULE_DEPEND(name, pseudofs, 1, 1, 1);
  309 
  310 #endif

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