98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/*
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* device.c - Low level device io functions. Part of the Linux-NTFS project.
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*
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* Copyright (c) 2003 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "device.h"
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/**
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* ntfs_device_alloc - allocate an ntfs device structure and pre-initialize it
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* name: name of the device (must be present)
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* state: initial device state (usually zero)
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* dops: ntfs device operations to use with the device (must be present)
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* private: pointer to private data (optional)
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*
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* Allocate an ntfs device structure and pre-initialize it with the user-
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* specified device operations @dops, device state @state, device name @name,
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* and optional private data @private.
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*
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* Note, @name is copied and can hence be freed after this functions returns.
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*
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* On success return a pointer to the allocated ntfs device structure and on
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* error return NULL with errno set to the error code returned by malloc().
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*/
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struct ntfs_device *ntfs_device_alloc(const char *name, const long state,
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struct ntfs_device_operations *dops, void *private)
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{
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struct ntfs_device *dev;
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if (!name) {
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errno = EINVAL;
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return NULL;
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}
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dev = (struct ntfs_device *)malloc(sizeof(struct ntfs_device));
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if (dev) {
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if (!(dev->d_name = strdup(name))) {
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int eo = errno;
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free(dev);
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errno = eo;
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return NULL;
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}
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dev->d_ops = dops;
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dev->d_state = state;
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dev->d_private = private;
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}
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return dev;
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}
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/**
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* ntfs_device_free - free an ntfs device structure
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* @dev: ntfs device structure to free
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*
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* Free the ntfs device structure @dev.
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*
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* Return 0 on success or -1 on error with errno set to the error code. The
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* following error codes are defined:
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* EINVAL Invalid pointer @dev.
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* EBUSY Device is still open. Close it before freeing it!
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*/
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int ntfs_device_free(struct ntfs_device *dev)
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{
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if (!dev) {
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errno = EINVAL;
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return -1;
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}
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if (NDevOpen(dev)) {
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errno = EBUSY;
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return -1;
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}
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if (dev->d_name)
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free(dev->d_name);
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free(dev);
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return 0;
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}
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