+++ /dev/null
-/*
- * This Cplant(TM) source code is the property of Sandia National
- * Laboratories.
- *
- * This Cplant(TM) source code is copyrighted by Sandia National
- * Laboratories.
- *
- * The redistribution of this Cplant(TM) source code is subject to the
- * terms of the GNU Lesser General Public License
- * (see cit/LGPL or http://www.gnu.org/licenses/lgpl.html)
- *
- * Cplant(TM) Copyright 1998-2003 Sandia Corporation.
- * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
- * license for use of this work by or on behalf of the US Government.
- * Export of this program may require a license from the United States
- * Government.
- */
-
-/*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Questions or comments about this library should be sent to:
- *
- * Lee Ward
- * Sandia National Laboratories, New Mexico
- * P.O. Box 5800
- * Albuquerque, NM 87185-1110
- *
- * lee@sandia.gov
- */
-
-#include <stdlib.h>
-#include <assert.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/queue.h>
-
-#include "sysio.h"
-#include "file.h"
-#include "inode.h"
-
-/*
- * Support for file IO.
- */
-
-/*
- * The open files table and it's size.
- */
-static struct file **_sysio_oftab = NULL;
-static size_t _sysio_oftab_size = 0;
-
-/*
- * Create and initialize open file record.
- */
-struct file *
-_sysio_fnew(struct inode *ino, int flags)
-{
- struct file *fil;
-
- fil = malloc(sizeof(struct file));
- if (!fil)
- return NULL;
-
- _SYSIO_FINIT(fil, ino, flags);
- F_REF(fil);
- I_REF(fil->f_ino);
-
- return fil;
-}
-
-/*
- * Destroy open file record.
- */
-void
-_sysio_fgone(struct file *fil)
-{
- int err;
-
- assert(!fil->f_ref);
- assert(fil->f_ino);
- err = (*fil->f_ino->i_ops.inop_close)(fil->f_ino);
- assert(!err);
- I_RELE(fil->f_ino);
- free(fil);
-}
-
-/*
- * IO operation completion handler.
- */
-void
-_sysio_fcompletio(struct ioctx *ioctx, struct file *fil)
-{
- _SYSIO_OFF_T off;
-
- if (ioctx->ioctx_cc <= 0)
- return;
-
- assert(ioctx->ioctx_ino == fil->f_ino);
- off = fil->f_pos + ioctx->ioctx_cc;
- if (fil->f_pos && off <= fil->f_pos)
- abort();
- fil->f_pos = off;
-}
-
-/*
- * Grow (or truncate) the file descriptor table.
- */
-static int
-fd_grow(size_t n)
-{
- size_t count;
- struct file **noftab, **filp;
-
- /*
- * Sanity check the new size.
- */
- if ((int )n < 0)
- return -EMFILE;
-
- /*
- * We never shrink the table.
- */
- if (n <= _sysio_oftab_size)
- return 0;
-
- noftab = realloc(_sysio_oftab, n * sizeof(struct file *));
- if (!noftab)
- return -ENOMEM;
- _sysio_oftab = noftab;
- count = _sysio_oftab_size;
- _sysio_oftab_size = n;
- filp = _sysio_oftab + count;
- n -= count;
- while (n--)
- *filp++ = NULL;
- return 0;
-}
-
-#ifdef ZERO_SUM_MEMORY
-void
-_sysio_fd_shutdown()
-{
-
- free(_sysio_oftab);
- _sysio_oftab_size = 0;
-}
-#endif
-
-/*
- * Find a free slot in the open files table greater than or equal to the
- * argument.
- */
-static int
-find_free_fildes(int low)
-{
- int n;
- int err;
- struct file **filp;
-
- for (n = low, filp = _sysio_oftab + low;
- n >= 0 && (unsigned )n < _sysio_oftab_size && *filp;
- n++, filp++)
- ;
- if (n < 0)
- return -ENFILE;
- if ((unsigned )n >= _sysio_oftab_size) {
- err = fd_grow((unsigned )n + 1);
- if (err)
- return err;
- filp = &_sysio_oftab[n];
- assert(!*filp);
- }
-
- return n;
-}
-
-/*
- * Find open file record from file descriptor.
- */
-struct file *
-_sysio_fd_find(int fd)
-{
- if (fd < 0 || (unsigned )fd >= _sysio_oftab_size)
- return NULL;
-
- return _sysio_oftab[fd];
-}
-
-/*
- * Close an open descriptor.
- */
-int
-_sysio_fd_close(int fd)
-{
- struct file *fil;
-
- fil = _sysio_fd_find(fd);
- if (!fil)
- return -EBADF;
-
- _sysio_oftab[fd] = NULL;
-
- F_RELE(fil);
-
- return 0;
-}
-
-/*
- * Associate open file record with given file descriptor (if forced), or any
- * available file descriptor if less than zero, or any available descriptor
- * greater than or equal to the given one if not forced.
- */
-int
-_sysio_fd_set(struct file *fil, int fd, int force)
-{
- int err;
- struct file *ofil;
-
- /*
- * Search for a free descriptor if needed.
- */
- if (fd < 0 || !force) {
- if (fd < 0)
- fd = 0;
- fd = find_free_fildes(fd);
- if (fd < 0)
- return fd;
- }
-
- if ((unsigned )fd >= _sysio_oftab_size) {
- err = fd_grow((unsigned )fd + 1);
- if (err)
- return err;
- }
-
- /*
- * Remember old.
- */
- ofil = _sysio_fd_find(fd);
- /*
- * Take the entry.
- */
- _sysio_oftab[fd] = fil;
- if (ofil)
- F_RELE(ofil);
-
- return fd;
-}
-
-/*
- * Duplicate old file descriptor.
- *
- * If the new file descriptor is less than zero, the new file descriptor
- * is chosen freely. Otherwise, choose an available descriptor greater
- * than or equal to the new, if not forced. Otherwise, if forced, (re)use
- * the new.
- */
-int
-_sysio_fd_dup(int oldfd, int newfd, int force)
-{
- struct file *fil;
- int fd;
-
- if (oldfd == newfd && oldfd >= 0)
- return newfd;
-
- fil = _sysio_fd_find(oldfd);
- if (!fil)
- return -EBADF;
-
- fd = _sysio_fd_set(fil, newfd, force);
- if (fd >= 0)
- F_REF(fil);
- return fd;
-}
-
-int
-_sysio_fd_close_all()
-{
- int fd;
- struct file **filp;
-
- /*
- * Close all open descriptors.
- */
- for (fd = 0, filp = _sysio_oftab;
- (size_t )fd < _sysio_oftab_size;
- fd++, filp++) {
- if (!*filp)
- continue;
- F_RELE(*filp);
- *filp = NULL;
- }
-
- /*
- * Release current working directory.
- */
- if (_sysio_cwd) {
- P_RELE(_sysio_cwd);
- _sysio_cwd = NULL;
- }
-
- return 0;
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff