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FreeBSD/Linux Kernel Cross Reference
sys/sys/statvfs.h

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    1 /*-
    2  * Copyright 2002 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 
   32 #ifndef _SYS_STATVFS_H_
   33 #define _SYS_STATVFS_H_
   34 
   35 #include <sys/cdefs.h>
   36 #include <sys/_types.h>
   37 
   38 /*
   39  * POSIX says we must define the fsblkcnt_t and fsfilcnt_t types here.
   40  * Note that these must be unsigned integer types, so we have to be
   41  * careful in converting the signed statfs members to the unsigned
   42  * statvfs members.  (Well, actually, we don't -- see below -- but
   43  * a quality implementation should.)
   44  */
   45 #ifndef _FSBLKCNT_T_DECLARED            /* always declared together */
   46 typedef __fsblkcnt_t    fsblkcnt_t;
   47 typedef __fsfilcnt_t    fsfilcnt_t;
   48 #define _FSBLKCNT_T_DECLARED
   49 #endif
   50 
   51 /*
   52  * The difference between `avail' and `free' is that `avail' represents
   53  * space available to unprivileged processes, whereas `free' includes all
   54  * unallocated space, including that reserved for privileged processes.
   55  * Or at least, that's the most useful interpretation.  (According to
   56  * the letter of the standard, this entire interface is completely
   57  * unspecified!)
   58  */
   59 struct statvfs {
   60         fsblkcnt_t      f_bavail;       /* Number of blocks */
   61         fsblkcnt_t      f_bfree;
   62         fsblkcnt_t      f_blocks;
   63         fsfilcnt_t      f_favail;       /* Number of files (e.g., inodes) */
   64         fsfilcnt_t      f_ffree;
   65         fsfilcnt_t      f_files;
   66         unsigned long   f_bsize;        /* Size of blocks counted above */
   67         unsigned long   f_flag;
   68         unsigned long   f_frsize;       /* Size of fragments */
   69         unsigned long   f_fsid;         /* Not meaningful */
   70         unsigned long   f_namemax;      /* Same as pathconf(_PC_NAME_MAX) */
   71 };
   72 
   73 /* flag bits for f_flag: */
   74 #define ST_RDONLY       0x1
   75 #define ST_NOSUID       0x2
   76 
   77 __BEGIN_DECLS
   78 int     fstatvfs(int, struct statvfs *);
   79 int     statvfs(const char *__restrict, struct statvfs *__restrict);
   80 __END_DECLS
   81 #endif /* _SYS_STATVFS_H_ */

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