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/sys/file.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  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  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)file.h      8.3 (Berkeley) 1/9/95
   30  * $FreeBSD: releng/6.0/sys/sys/file.h 141636 2005-02-10 12:27:58Z phk $
   31  */
   32 
   33 #ifndef _SYS_FILE_H_
   34 #define _SYS_FILE_H_
   35 
   36 #ifndef _KERNEL
   37 #include <sys/types.h> /* XXX */
   38 #include <sys/fcntl.h>
   39 #include <sys/unistd.h>
   40 #else
   41 #include <sys/queue.h>
   42 #include <sys/_lock.h>
   43 #include <sys/_mutex.h>
   44 
   45 struct stat;
   46 struct thread;
   47 struct uio;
   48 struct knote;
   49 struct vnode;
   50 struct socket;
   51 
   52 
   53 #endif /* _KERNEL */
   54 
   55 #define DTYPE_VNODE     1       /* file */
   56 #define DTYPE_SOCKET    2       /* communications endpoint */
   57 #define DTYPE_PIPE      3       /* pipe */
   58 #define DTYPE_FIFO      4       /* fifo (named pipe) */
   59 #define DTYPE_KQUEUE    5       /* event queue */
   60 #define DTYPE_CRYPTO    6       /* crypto */
   61 
   62 #ifdef _KERNEL
   63 
   64 struct file;
   65 struct ucred;
   66 
   67 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
   68                     struct ucred *active_cred, int flags,
   69                     struct thread *td);
   70 #define FOF_OFFSET      1       /* Use the offset in uio argument */
   71 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
   72                     struct ucred *active_cred, struct thread *td);
   73 typedef int fo_poll_t(struct file *fp, int events,
   74                     struct ucred *active_cred, struct thread *td);
   75 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
   76 typedef int fo_stat_t(struct file *fp, struct stat *sb,
   77                     struct ucred *active_cred, struct thread *td);
   78 typedef int fo_close_t(struct file *fp, struct thread *td);
   79 typedef int fo_flags_t;
   80 
   81 struct fileops {
   82         fo_rdwr_t       *fo_read;
   83         fo_rdwr_t       *fo_write;
   84         fo_ioctl_t      *fo_ioctl;
   85         fo_poll_t       *fo_poll;
   86         fo_kqfilter_t   *fo_kqfilter;
   87         fo_stat_t       *fo_stat;
   88         fo_close_t      *fo_close;
   89         fo_flags_t      fo_flags;       /* DFLAG_* below */
   90 };
   91 
   92 #define DFLAG_PASSABLE  0x01    /* may be passed via unix sockets. */
   93 #define DFLAG_SEEKABLE  0x02    /* seekable / nonsequential */
   94 
   95 /*
   96  * Kernel descriptor table.
   97  * One entry for each open kernel vnode and socket.
   98  *
   99  * Below is the list of locks that protects members in struct file.
  100  *
  101  * (fl) filelist_lock
  102  * (f)  f_mtx in struct file
  103  * none not locked
  104  */
  105 
  106 struct file {
  107         LIST_ENTRY(file) f_list;/* (fl) list of active files */
  108         short   f_type;         /* descriptor type */
  109         void    *f_data;        /* file descriptor specific data */
  110         u_int   f_flag;         /* see fcntl.h */
  111         struct mtx      *f_mtxp;        /* mutex to protect data */
  112         struct fileops *f_ops;  /* File operations */
  113         struct  ucred *f_cred;  /* credentials associated with descriptor */
  114         int     f_count;        /* (f) reference count */
  115         struct vnode *f_vnode;  /* NULL or applicable vnode */
  116 
  117         /* DFLAG_SEEKABLE specific fields */
  118         off_t   f_offset;
  119 
  120         /* DTYPE_SOCKET specific fields */
  121         short   f_gcflag;       /* used by thread doing fd garbage collection */
  122 #define FMARK           0x1     /* mark during gc() */
  123 #define FDEFER          0x2     /* defer for next gc pass */
  124         int     f_msgcount;     /* (f) references from message queue */
  125 
  126         /* DTYPE_VNODE specific fields */
  127         int     f_seqcount;     /*
  128                                  * count of sequential accesses -- cleared
  129                                  * by most seek operations.
  130                                  */
  131         off_t   f_nextoff;      /*
  132                                  * offset of next expected read or write
  133                                  */
  134         void    *f_label;       /* Place-holder for struct label pointer. */
  135 };
  136 
  137 #endif /* _KERNEL */
  138 
  139 /*
  140  * Userland version of struct file, for sysctl
  141  */
  142 struct xfile {
  143         size_t  xf_size;        /* size of struct xfile */
  144         pid_t   xf_pid;         /* owning process */
  145         uid_t   xf_uid;         /* effective uid of owning process */
  146         int     xf_fd;          /* descriptor number */
  147         void    *xf_file;       /* address of struct file */
  148         short   xf_type;        /* descriptor type */
  149         int     xf_count;       /* reference count */
  150         int     xf_msgcount;    /* references from message queue */
  151         off_t   xf_offset;      /* file offset */
  152         void    *xf_data;       /* file descriptor specific data */
  153         void    *xf_vnode;      /* vnode pointer */
  154         u_int   xf_flag;        /* flags (see fcntl.h) */
  155 };
  156 
  157 #ifdef _KERNEL
  158 
  159 #ifdef MALLOC_DECLARE
  160 MALLOC_DECLARE(M_FILE);
  161 #endif
  162 
  163 LIST_HEAD(filelist, file);
  164 extern struct filelist filehead; /* (fl) head of list of open files */
  165 extern struct fileops vnops;
  166 extern struct fileops badfileops;
  167 extern struct fileops socketops;
  168 extern int maxfiles;            /* kernel limit on number of open files */
  169 extern int maxfilesperproc;     /* per process limit on number of open files */
  170 extern int openfiles;           /* (fl) actual number of open files */
  171 extern struct sx filelist_lock; /* sx to protect filelist and openfiles */
  172 
  173 int fget(struct thread *td, int fd, struct file **fpp);
  174 int fget_read(struct thread *td, int fd, struct file **fpp);
  175 int fget_write(struct thread *td, int fd, struct file **fpp);
  176 int fdrop(struct file *fp, struct thread *td);
  177 
  178 /*
  179  * The socket operations are used a couple of places.
  180  * XXX: This is wrong, they should go through the operations vector for
  181  * XXX: sockets instead of going directly for the individual functions. /phk
  182  */
  183 fo_rdwr_t       soo_read;
  184 fo_rdwr_t       soo_write;
  185 fo_ioctl_t      soo_ioctl;
  186 fo_poll_t       soo_poll;
  187 fo_kqfilter_t   soo_kqfilter;
  188 fo_stat_t       soo_stat;
  189 fo_close_t      soo_close;
  190 
  191 /* Lock a file. */
  192 #define FILE_LOCK(f)    mtx_lock((f)->f_mtxp)
  193 #define FILE_UNLOCK(f)  mtx_unlock((f)->f_mtxp)
  194 #define FILE_LOCKED(f)  mtx_owned((f)->f_mtxp)
  195 #define FILE_LOCK_ASSERT(f, type) mtx_assert((f)->f_mtxp, (type))
  196 
  197 int fgetvp(struct thread *td, int fd, struct vnode **vpp);
  198 int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
  199 int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
  200 
  201 int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
  202 void fputsock(struct socket *sp);
  203 
  204 #define fhold_locked(fp)                                                \
  205         do {                                                            \
  206                 FILE_LOCK_ASSERT(fp, MA_OWNED);                         \
  207                 (fp)->f_count++;                                        \
  208         } while (0)
  209 
  210 #define fhold(fp)                                                       \
  211         do {                                                            \
  212                 FILE_LOCK(fp);                                          \
  213                 (fp)->f_count++;                                        \
  214                 FILE_UNLOCK(fp);                                        \
  215         } while (0)
  216 
  217 static __inline fo_rdwr_t       fo_read;
  218 static __inline fo_rdwr_t       fo_write;
  219 static __inline fo_ioctl_t      fo_ioctl;
  220 static __inline fo_poll_t       fo_poll;
  221 static __inline fo_kqfilter_t   fo_kqfilter;
  222 static __inline fo_stat_t       fo_stat;
  223 static __inline fo_close_t      fo_close;
  224 
  225 static __inline int
  226 fo_read(fp, uio, active_cred, flags, td)
  227         struct file *fp;
  228         struct uio *uio;
  229         struct ucred *active_cred;
  230         int flags;
  231         struct thread *td;
  232 {
  233 
  234         return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
  235 }
  236 
  237 static __inline int
  238 fo_write(fp, uio, active_cred, flags, td)
  239         struct file *fp;
  240         struct uio *uio;
  241         struct ucred *active_cred;
  242         int flags;
  243         struct thread *td;
  244 {
  245 
  246         return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
  247 }
  248 
  249 static __inline int
  250 fo_ioctl(fp, com, data, active_cred, td)
  251         struct file *fp;
  252         u_long com;
  253         void *data;
  254         struct ucred *active_cred;
  255         struct thread *td;
  256 {
  257 
  258         return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
  259 }
  260 
  261 static __inline int
  262 fo_poll(fp, events, active_cred, td)
  263         struct file *fp;
  264         int events;
  265         struct ucred *active_cred;
  266         struct thread *td;
  267 {
  268 
  269         return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
  270 }
  271 
  272 static __inline int
  273 fo_stat(fp, sb, active_cred, td)
  274         struct file *fp;
  275         struct stat *sb;
  276         struct ucred *active_cred;
  277         struct thread *td;
  278 {
  279 
  280         return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
  281 }
  282 
  283 static __inline int
  284 fo_close(fp, td)
  285         struct file *fp;
  286         struct thread *td;
  287 {
  288 
  289         return ((*fp->f_ops->fo_close)(fp, td));
  290 }
  291 
  292 static __inline int
  293 fo_kqfilter(fp, kn)
  294         struct file *fp;
  295         struct knote *kn;
  296 {
  297 
  298         return ((*fp->f_ops->fo_kqfilter)(fp, kn));
  299 }
  300 
  301 #endif /* _KERNEL */
  302 
  303 #endif /* !SYS_FILE_H */

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