ad_fstype.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

/* This file is quickly becoming the single one, outside the ADIO
 * implementations, which has "what ADIO components are built in" code in it.
 */

#include "adio.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#ifdef HAVE_PVFS_H
#include "pvfs.h"
#endif

#ifdef HAVE_PVFS2_H
#include "pvfs2.h"
#endif

/* Notes on detection process:
 *
 * There are three more "general" mechanisms that we use for detecting
 * file system type:
 * - struct statfs's f_type field
 * - struct statvfs's f_basetype field
 * - struct stat's st_fstype field
 *
 * Otherwise we'll fall back on some OS-specific approach.
 */

#ifdef HAVE_STRUCT_STATFS
# ifdef HAVE_SYS_VFS_H
# include <sys/vfs.h>
# endif
# ifdef HAVE_SYS_STATVFS_H
# include <sys/statvfs.h>
# endif
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# ifdef HAVE_SYS_MOUNT_H
# include <sys/mount.h>
# endif
 /* On Linux platforms, linux/nfs_fs.h is all messed up and cannot be
  * reliably included.
  */
# if defined(ROMIO_NFS) && !defined(NFS_SUPER_MAGIC)
# define NFS_SUPER_MAGIC 0x6969
# endif

# if defined(ROMIO_PANFS) && !defined(PAN_KERNEL_FS_CLIENT_SUPER_MAGIC)
# define PAN_KERNEL_FS_CLIENT_SUPER_MAGIC 0xAAD7AAEA
# endif
#endif

# if defined(ROMIO_XFS) && !defined(XFS_SUPER_MAGIC)
# define XFS_SUPER_MAGIC 0x58465342
# endif

#ifdef ROMIO_HAVE_STRUCT_STATVFS_WITH_F_BASETYPE
# ifdef HAVE_SYS_STATVFS_H
# include <sys/statvfs.h>
# endif
# ifdef HAVE_SYS_VFS_H
# include <sys/vfs.h>
# endif
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# ifdef HAVE_SYS_MOUNT_H
# include <sys/mount.h>
# endif
#endif

#ifdef ROMIO_HAVE_STRUCT_STAT_WITH_ST_FSTYPE
# ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
# endif
# ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
# endif
#endif

#ifndef ROMIO_NTFS
static void ADIO_FileSysType_parentdir(char *filename, char **dirnamep);
#endif
static void ADIO_FileSysType_prefix(char *filename, int *fstype, 
				    int *error_code);
static void ADIO_FileSysType_fncall(char *filename, int *fstype, 
				    int *error_code);

/*
 ADIO_FileSysType_parentdir - determines a string pathname for the
 parent directory of a given filename.

Input Parameters:
. filename - pointer to file name character array

Output Parameters:
. dirnamep - pointer to location in which to store a pointer to a string

 Note that the caller should free the memory located at the pointer returned
 after the string is no longer needed.
*/
#ifndef ROMIO_NTFS
#ifndef PATH_MAX
#define PATH_MAX 65535
#endif

/* In a strict ANSI environment, S_ISLNK may not be defined.  Fix that
   here.  We assume that S_ISLNK is *always* defined as a macro.  If
   that is not universally true, then add a test to the romio
   configure that trys to link a program that references S_ISLNK */
#if !defined(S_ISLNK) 
#    if defined(S_IFLNK)
     /* Check for the link bit */
#    define S_ISLNK(mode) ((mode) & S_IFLNK)
#    else
     /* no way to check if it is a link, so say false */
#    define S_ISLNK(mode) 0   
#    endif
#endif

/* ADIO_FileSysType_parentdir
 *
 * Returns pointer to string in dirnamep; that string is allocated with
 * strdup and must be free()'d.
 */
static void ADIO_FileSysType_parentdir(char *filename, char **dirnamep)
{
    int err;
    char *dir = NULL, *slash;
    struct stat statbuf;
    
    err = lstat(filename, &statbuf);

    if (err || (!S_ISLNK(statbuf.st_mode))) {
	/* no such file, or file is not a link; these are the "normal"
	 * cases where we can just return the parent directory.
	 */
	dir = ADIOI_Strdup(filename);
    }
    else {
	/* filename is a symlink.  we've presumably already tried
	 * to stat it and found it to be missing (dangling link),
	 * but this code doesn't care if the target is really there
	 * or not.
	 */
	int namelen;
	char *linkbuf;

	linkbuf = ADIOI_Malloc(PATH_MAX+1);
	namelen = readlink(filename, linkbuf, PATH_MAX+1);
	if (namelen == -1) {
	    /* something strange has happened between the time that
	     * we determined that this was a link and the time that
	     * we attempted to read it; punt and use the old name.
	     */
	    dir = ADIOI_Strdup(filename);
	}
	else {
	    /* successfully read the link */
	    linkbuf[namelen] = '\0'; /* readlink doesn't null terminate */
	    dir = ADIOI_Strdup(linkbuf);
	    ADIOI_Free(linkbuf);
	}
    }

    slash = strrchr(dir, '/');
    if (!slash) ADIOI_Strncpy(dir, ".", 2);
    else {
	if (slash == dir) *(dir + 1) = '\0';
	else *slash = '\0';
    }

    *dirnamep = dir;
    return;
}
#endif /* ROMIO_NTFS */

/*
 ADIO_FileSysType_fncall - determines the file system type for a given file 
 using a system-dependent function call

Input Parameters:
. filename - pointer to file name character array

Output Parameters:
. fstype - location in which to store file system type (ADIO_XXX)
. error_code - location in which to store error code

 MPI_SUCCESS is stored in the location pointed to by error_code on success.

 This function is used by MPI_File_open() and MPI_File_delete() to determine 
 file system type.  Most other functions use the type which is stored when the 
 file is opened.
 */
static void ADIO_FileSysType_fncall(char *filename, int *fstype, int *error_code)
{
#ifndef ROMIO_NTFS
    char *dir;
    int err;
#endif

#ifdef ROMIO_HAVE_STRUCT_STATVFS_WITH_F_BASETYPE
    struct statvfs vfsbuf;
#endif
#ifdef HAVE_STRUCT_STATFS
    struct statfs fsbuf;
#endif
#ifdef ROMIO_HAVE_STRUCT_STAT_WITH_ST_FSTYPE
    struct stat sbuf;
#endif
    static char myname[] = "ADIO_RESOLVEFILETYPE_FNCALL";

    *error_code = MPI_SUCCESS;

#ifdef ROMIO_HAVE_STRUCT_STATVFS_WITH_F_BASETYPE
    do {
	err = statvfs(filename, &vfsbuf);
    } while (err && (errno == ESTALE));

    if (err && (errno == ENOENT)) {
	/* ENOENT may be returned in two cases:
	 * 1) no directory entry for "filename"
	 * 2) "filename" is a dangling symbolic link
	 *
	 * ADIO_FileSysType_parentdir tries to deal with both cases.
	 */
	ADIO_FileSysType_parentdir(filename, &dir);
	err = statvfs(dir, &vfsbuf);

	ADIOI_Free(dir);
    }

    /* --BEGIN ERROR HANDLING-- */
    if (err) {
	*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
					   myname, __LINE__, MPI_ERR_NO_SUCH_FILE,
					   "**filename", "**filename %s", filename);
	return;
    }
    /* --END ERROR HANDLING-- */

    /* FPRINTF(stderr, "%s\n", vfsbuf.f_basetype); */
    if (!strncmp(vfsbuf.f_basetype, "nfs", 3)) {
	*fstype = ADIO_NFS;
	return;
    }
    if (!strncmp(vfsbuf.f_basetype, "xfs", 3)) {
	*fstype = ADIO_XFS;
	return;
    }

# ifdef ROMIO_UFS
    /* if UFS support is enabled, default to that */
    *fstype = ADIO_UFS;
    return;
# endif

    /* --BEGIN ERROR HANDLING-- */
    *error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
				       myname, __LINE__, MPI_ERR_NO_SUCH_FILE,
				       "**filename", "**filename %s", filename);
    /* --END ERROR HANDLING-- */
#endif /* STATVFS APPROACH */

#ifdef HAVE_STRUCT_STATFS
    do {
	err = statfs(filename, &fsbuf);
    } while (err && (errno == ESTALE));

    if (err && (errno == ENOENT)) {
	ADIO_FileSysType_parentdir(filename, &dir);
	err = statfs(dir, &fsbuf);
	ADIOI_Free(dir);
    }

    /* --BEGIN ERROR HANDLING-- */
    if (err) {
    	*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
					   myname, __LINE__, MPI_ERR_NO_SUCH_FILE,
					   "**filename", "**filename %s", filename);
	return;
    }
    /* --END ERROR HANDLING-- */

# ifdef ROMIO_HAVE_STRUCT_STATFS_WITH_F_FSTYPENAME
    if ( !strncmp("nfs",fsbuf.f_fstypename,3) ) {
	*fstype = ADIO_NFS;
	return;
    }
# endif
    /* FPRINTF(stderr, "%d\n", fsbuf.f_type);*/
# ifdef NFS_SUPER_MAGIC
    if (fsbuf.f_type == NFS_SUPER_MAGIC) {
	*fstype = ADIO_NFS;
	return;
    }
# endif

# ifdef PAN_KERNEL_FS_CLIENT_SUPER_MAGIC
    if (fsbuf.f_type == PAN_KERNEL_FS_CLIENT_SUPER_MAGIC) {
	*fstype = ADIO_PANFS;
	return;
    }
# endif

# ifdef MOUNT_NFS
    if (fsbuf.f_type == MOUNT_NFS) {
	*fstype = ADIO_NFS;
	return;
    }
# endif

# ifdef MOUNT_PFS
    if (fsbuf.f_type == MOUNT_PFS) {
	*fstype = ADIO_PFS;
	return;
    }
# endif

# ifdef PVFS_SUPER_MAGIC