source: gpfs_3.1_ker2.6.20/lpp/mmfs/src/gpl-linux/tscalls.c @ 16

/***************************************************************************
 *
 * Copyright (C) 2001 International Business Machines
 * All rights reserved.
 *
 * This file is part of the GPFS mmfslinux kernel module.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer. 
 *  2. Redistributions in binary form must reproduce the above copyright 
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written
 *     permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *************************************************************************** */
/* @(#)78       1.2  src/avs/fs/mmfs/ts/kernext/gpl-linux/tscalls.c, mmfs, avs_rgpfs24, rgpfs24s007a 10/27/06 16:48:13 */
/*
 * Portability layer equivalent of ts/util/tscalls.c
 * Includes a subset of the libgpfs interfaces that GPFS has provided
 * in open-source form.
 *
 * Contents:
 *   gpfs_getacl
 *   gpfs_putacl
 *   gpfs_set_share
 *   gpfs_set_lease
 *   gpfs_get_lease
 */

#include <stdlib.h>
#include <sys/errno.h>
#include <sys/ioctl.h>

#include <fcntl.h>
#define F_SETLEASE 1024
#define F_GETLEASE 1025

#include <cxiSystem.h>
#include <gpfs_gpl.h> /* open-source segment of gpfs.h */
#include <cxiTSFattr.h>

#define  IOCTL_FATTR   53
#define  IOCTL_GETACL  56
#define  IOCTL_PUTACL  57
#define  IOCTL_SHARE  112
#define  IOCTL_LEASE  113

struct ioArgs
{
  long arg1;
  long arg2;
  long arg3;
  long arg4;
  long arg5;
};

/*-------------------------------------------------------------------------
 * NAME:        gpfs_getacl
 *
 * FUNCTION:    Interface to read GPFS ACLs
 *
 * Returns:      0      Successful
 *              -1      Failure
 *
 * Errno:       ENOSYS  function not available
 *-------------------------------------------------------------------------*/
int
gpfs_getacl(char *pathname,
            int   flags,
            void *aclP)
{
  int rc;
  int fd;
  struct ioArgs io;

  fd = open(GPFS_DEVNAME, O_RDONLY);
  if (fd < 0)
  {
    rc = -1;
    errno = ENOSYS;
    goto xerror;
  }

  /* Retrieve the ACL from GPFS */
  io.arg1 = (long)pathname;
  io.arg2 = (long)flags;
  io.arg3 = (long)aclP;

  rc = ioctl(fd, IOCTL_GETACL, &io);

xerror:
  if (fd >= 0)
    close(fd);

  return rc;
}


/*-------------------------------------------------------------------------
 * NAME:        gpfs_putacl
 *
 * FUNCTION:    Interface to store GPFS ACLs
 *
 * Returns:      0      Successful
 *              -1      Failure
 *
 * Errno:       ENOSYS  function not available
 *-------------------------------------------------------------------------*/
int
gpfs_putacl(char *pathname,
            int   flags,
            void *aclP)
{
  int rc;
  int fd;
  struct ioArgs io;

  fd = open(GPFS_DEVNAME, O_RDONLY);
  if (fd < 0)
  {
    rc = -1;
    errno = ENOSYS;
    goto xerror;
  }

  /* Store the ACL into GPFS */
  io.arg1 = (long)pathname;
  io.arg2 = (long)flags;
  io.arg3 = (long)aclP;

  rc = ioctl(fd, IOCTL_PUTACL, &io);

xerror:
  if (fd >= 0)
    close(fd);

  return rc;
}


/*-------------------------------------------------------------------------
 * NAME:        gpfs_set_share
 *
 * FUNCTION:    Samba interface to GPFS OpenLks
 *              Called from the Samba daemon to reserve a share
 *
 * INPUT:       object_fd : file descriptor of the object to share
 *              share: modes being requested
 *              deny : modes to deny
 * OUTPUT:      None
 *
 * Returns:      0      Successful
 *              -1      Failure
 * Errno:       ENOENT  File not found
 *              EACCES  Share mode not granted
 *-------------------------------------------------------------------------*/
int gpfs_set_share(int object_fd,
                   unsigned int share,
                   unsigned int deny)
{
  int rc;
  int fd;
  struct ioArgs io;

  fd = open(GPFS_DEVNAME, O_RDONLY);
  if (fd < 0)
  {
    rc = -1;
    errno = ENOSYS;
    goto xerror;
  }

  /* Request the share from GPFS */
  io.arg1 = (long)object_fd;
  io.arg2 = (long)share;
  io.arg3 = (long)deny;

  rc = ioctl(fd, IOCTL_SHARE, &io);

xerror:
  if (fd >= 0)
    close(fd);

  return rc;
}

/*-------------------------------------------------------------------------
 * NAME:        gpfs_set_lease
 *
 * FUNCTION:    Samba interface to GPFS OpLks
 *              Called from the Samba daemon to obtain a lease
 *
 * INPUT:       object_fd : file descriptor of the object to lease
 *              leaseType: mode being requested
 * OUTPUT:      None
 *
 * Returns:      0      Successful
 *              -1      Failure
 * Errno:       EACCES  Lease not granted
 *              ENOENT  File not found
 *-------------------------------------------------------------------------*/
int gpfs_set_lease(int object_fd,
                   unsigned int leaseType)
{
  int rc = 0;
  int fd;
  int lrc, serrno;
  struct ioArgs io;

  fd = open(GPFS_DEVNAME, O_RDONLY);
  if (fd < 0)
  {
    rc = -1;
    errno = ENOSYS;
    goto xerror;
  }

  /* Queue Linux structures required for break notification */
  rc = CXI_REGISTER_LEASE(object_fd, leaseType);
  if (rc)
    return rc;

  /* Request the lease from GPFS */
  io.arg1 = (long)object_fd;
  io.arg2 = (long)leaseType;
  io.arg3 = (long)NULL;
  io.arg4 = (long)NULL;

  rc = ioctl(fd, IOCTL_LEASE, &io);

  if (rc && (leaseType != GPFS_LEASE_NONE))
  {
    serrno = errno;

    /* Dequeue Linux structures */
    lrc = CXI_REGISTER_LEASE(object_fd, GPFS_LEASE_NONE);

    errno = serrno;
  }

xerror:
  if (fd >= 0)
    close(fd);

  return rc;
}


/*-------------------------------------------------------------------------
 * NAME:        gpfs_get_lease
 *
 * FUNCTION:    Samba interface to GPFS OpLks
 *              Called from the Samba daemon to query leases held
 *
 * INPUT:       object_fd : file descriptor of the leased object
 * OUTPUT:      None
 *
 * Returns:     GPFS_LEASE_READ
 *              GPFS_LEASE_WRITE
 *              GPFS_LEASE_NONE
 *              -1      Failure
 *
 * Errno:       ENOENT  File not found
 *              EINVAL
 *-------------------------------------------------------------------------*/
int gpfs_get_lease(int object_fd)
{
  int rc = 0;

  CXI_GET_LEASE_HELD(object_fd, rc);

  if (rc<0)
  {
    errno = -rc;
    rc = -1;
  }
  return rc;
}

/*-------------------------------------------------------------------------
 * NAME:        gpfs_prealloc()
 *              Preallocate disk storage for the file handle that has
 *              already been opened for writing, starting at the specified
 *              starting offset and covering at least the number of bytes
 *              requested. Allocations are rounded to block boundaries
 *              (block size can be found using fstat() in st_blksize.)
 *              Any existing data already in the file will not be modified.
 *              Any read of the preallocated blocks will return zeros.
 *
 * FUNCTION:
 * Returns:      0      Successful
 *              -1      Failure
 *
 * Errno:       ENOSYS  No prealloc service available
 *              EBADF   Bad file handle
 *              EINVAL  Not a GPFS file
 *              EINVAL  Not a regular file
 *              EINVAL  StartOffset or BytesToPrealloc < 0
 *              EACCES  File not opened for writing
 *              EDQUOT  Quota exceeded
 *              ENOSPC  Not enough space on disk
 *-------------------------------------------------------------------------*/
int
gpfs_prealloc(int FileHandle, gpfs_off64_t StartOffset,
                              gpfs_off64_t BytesToTransfer)
{
  int rc;
  int fd;
  struct ioArgs io;
  struct filePreallocation preAlloc = {0,0,0};

  fd = open(GPFS_DEVNAME, O_RDONLY);
  if (fd < 0)
  {
    rc = -1;
    errno = ENOSYS;
    goto xerror;
  }

  /* Construct the filePreallocation structure */
  preAlloc.size = BytesToTransfer;
  preAlloc.offset = StartOffset;
  preAlloc.flags = 0;

  /* Store the ACL into GPFS */
  io.arg1 = (long)FileHandle;
  io.arg2 = (long)PREALLOCATE_FILE;
  io.arg3 = (long)&preAlloc;
  io.arg4 = (long)NULL;

  rc = ioctl(fd, IOCTL_FATTR, &io);

xerror:
  if (fd >= 0)
    close(fd);

  return rc;
}   /* --------- end of gpfs_prealloc() -------------- */