mirror of
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731 lines
20 KiB
C
731 lines
20 KiB
C
/**
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* device.c - Low level device io functions. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2004-2006 Anton Altaparmakov
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* Copyright (c) 2004-2006 Szabolcs Szakacsits
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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 NTFS-3G
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifdef HAVE_SYS_MOUNT_H
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#include <sys/mount.h>
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#endif
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#ifdef HAVE_LINUX_FD_H
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#include <linux/fd.h>
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#endif
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#ifdef HAVE_LINUX_HDREG_H
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#include <linux/hdreg.h>
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#endif
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#include "types.h"
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#include "mst.h"
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#include "debug.h"
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#include "device.h"
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#include "logging.h"
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#include "misc.h"
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#if defined(linux) && defined(_IO) && !defined(BLKGETSIZE)
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#define BLKGETSIZE _IO(0x12,96) /* Get device size in 512-byte blocks. */
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#endif
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#if defined(linux) && defined(_IOR) && !defined(BLKGETSIZE64)
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#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* Get device size in bytes. */
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#endif
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#if defined(linux) && !defined(HDIO_GETGEO)
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#define HDIO_GETGEO 0x0301 /* Get device geometry. */
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#endif
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#if defined(linux) && defined(_IO) && !defined(BLKSSZGET)
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# define BLKSSZGET _IO(0x12,104) /* Get device sector size in bytes. */
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#endif
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#if defined(linux) && defined(_IO) && !defined(BLKBSZSET)
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# define BLKBSZSET _IOW(0x12,113,size_t) /* Set device block size in bytes. */
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#endif
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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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* @priv_data: 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 @priv_data.
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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 ntfs_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 *priv_data)
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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 = ntfs_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 = priv_data;
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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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free(dev->d_name);
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free(dev);
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return 0;
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}
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/**
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* ntfs_pread - positioned read from disk
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* @dev: device to read from
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* @pos: position in device to read from
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* @count: number of bytes to read
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* @b: output data buffer
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*
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* This function will read @count bytes from device @dev at position @pos into
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* the data buffer @b.
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*
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* On success, return the number of successfully read bytes. If this number is
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* lower than @count this means that we have either reached end of file or
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* encountered an error during the read so that the read is partial. 0 means
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* end of file or nothing to read (@count is 0).
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*
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* On error and nothing has been read, return -1 with errno set appropriately
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* to the return code of either seek, read, or set to EINVAL in case of
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* invalid arguments.
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*/
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s64 ntfs_pread(struct ntfs_device *dev, const s64 pos, s64 count, void *b)
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{
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s64 br, total;
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struct ntfs_device_operations *dops;
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ntfs_log_trace("pos %lld, count %lld\n",(long long)pos,(long long)count);
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if (!b || count < 0 || pos < 0) {
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errno = EINVAL;
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return -1;
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}
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if (!count)
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return 0;
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dops = dev->d_ops;
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for (total = 0; count; count -= br, total += br) {
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br = dops->pread(dev, (char*)b + total, count, pos + total);
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/* If everything ok, continue. */
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if (br > 0)
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continue;
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/* If EOF or error return number of bytes read. */
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if (!br || total)
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return total;
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/* Nothing read and error, return error status. */
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return br;
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}
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/* Finally, return the number of bytes read. */
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return total;
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}
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/**
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* ntfs_pwrite - positioned write to disk
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* @dev: device to write to
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* @pos: position in file descriptor to write to
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* @count: number of bytes to write
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* @b: data buffer to write to disk
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*
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* This function will write @count bytes from data buffer @b to the device @dev
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* at position @pos.
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*
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* On success, return the number of successfully written bytes. If this number
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* is lower than @count this means that the write has been interrupted in
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* flight or that an error was encountered during the write so that the write
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* is partial. 0 means nothing was written (also return 0 when @count is 0).
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*
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* On error and nothing has been written, return -1 with errno set
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* appropriately to the return code of either seek, write, or set
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* to EINVAL in case of invalid arguments.
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*/
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s64 ntfs_pwrite(struct ntfs_device *dev, const s64 pos, s64 count,
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const void *b)
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{
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s64 written, total, ret = -1;
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struct ntfs_device_operations *dops;
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ntfs_log_trace("pos %lld, count %lld\n",(long long)pos,(long long)count);
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if (!b || count < 0 || pos < 0) {
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errno = EINVAL;
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goto out;
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}
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if (!count)
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return 0;
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if (NDevReadOnly(dev)) {
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errno = EROFS;
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goto out;
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}
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dops = dev->d_ops;
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NDevSetDirty(dev);
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for (total = 0; count; count -= written, total += written) {
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written = dops->pwrite(dev, (const char*)b + total, count,
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pos + total);
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/* If everything ok, continue. */
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if (written > 0)
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continue;
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/*
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* If nothing written or error return number of bytes written.
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*/
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if (!written || total)
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break;
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/* Nothing written and error, return error status. */
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total = written;
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break;
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}
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ret = total;
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out:
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return ret;
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}
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/**
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* ntfs_mst_pread - multi sector transfer (mst) positioned read
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* @dev: device to read from
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* @pos: position in file descriptor to read from
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* @count: number of blocks to read
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* @bksize: size of each block that needs mst deprotecting
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* @b: output data buffer
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*
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* Multi sector transfer (mst) positioned read. This function will read @count
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* blocks of size @bksize bytes each from device @dev at position @pos into the
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* the data buffer @b.
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*
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* On success, return the number of successfully read blocks. If this number is
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* lower than @count this means that we have reached end of file, that the read
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* was interrupted, or that an error was encountered during the read so that
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* the read is partial. 0 means end of file or nothing was read (also return 0
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* when @count or @bksize are 0).
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*
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* On error and nothing was read, return -1 with errno set appropriately to the
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* return code of either seek, read, or set to EINVAL in case of invalid
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* arguments.
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*
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* NOTE: If an incomplete multi sector transfer has been detected the magic
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* will have been changed to magic_BAAD but no error will be returned. Thus it
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* is possible that we return count blocks as being read but that any number
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* (between zero and count!) of these blocks is actually subject to a multi
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* sector transfer error. This should be detected by the caller by checking for
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* the magic being "BAAD".
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*/
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s64 ntfs_mst_pread(struct ntfs_device *dev, const s64 pos, s64 count,
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const u32 bksize, void *b)
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{
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s64 br, i;
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if (bksize & (bksize - 1) || bksize % NTFS_BLOCK_SIZE) {
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errno = EINVAL;
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return -1;
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}
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/* Do the read. */
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br = ntfs_pread(dev, pos, count * bksize, b);
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if (br < 0)
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return br;
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/*
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* Apply fixups to successfully read data, disregarding any errors
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* returned from the MST fixup function. This is because we want to
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* fixup everything possible and we rely on the fact that the "BAAD"
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* magic will be detected later on.
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*/
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count = br / bksize;
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for (i = 0; i < count; ++i)
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ntfs_mst_post_read_fixup((NTFS_RECORD*)
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((u8*)b + i * bksize), bksize);
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/* Finally, return the number of complete blocks read. */
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return count;
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}
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/**
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* ntfs_mst_pwrite - multi sector transfer (mst) positioned write
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* @dev: device to write to
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* @pos: position in file descriptor to write to
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* @count: number of blocks to write
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* @bksize: size of each block that needs mst protecting
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* @b: data buffer to write to disk
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*
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* Multi sector transfer (mst) positioned write. This function will write
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* @count blocks of size @bksize bytes each from data buffer @b to the device
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* @dev at position @pos.
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*
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* On success, return the number of successfully written blocks. If this number
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* is lower than @count this means that the write has been interrupted or that
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* an error was encountered during the write so that the write is partial. 0
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* means nothing was written (also return 0 when @count or @bksize are 0).
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*
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* On error and nothing has been written, return -1 with errno set
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* appropriately to the return code of either seek, write, or set
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* to EINVAL in case of invalid arguments.
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*
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* NOTE: We mst protect the data, write it, then mst deprotect it using a quick
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* deprotect algorithm (no checking). This saves us from making a copy before
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* the write and at the same time causes the usn to be incremented in the
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* buffer. This conceptually fits in better with the idea that cached data is
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* always deprotected and protection is performed when the data is actually
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* going to hit the disk and the cache is immediately deprotected again
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* simulating an mst read on the written data. This way cache coherency is
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* achieved.
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*/
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s64 ntfs_mst_pwrite(struct ntfs_device *dev, const s64 pos, s64 count,
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const u32 bksize, void *b)
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{
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s64 written, i;
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if (count < 0 || bksize % NTFS_BLOCK_SIZE) {
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errno = EINVAL;
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return -1;
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}
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if (!count)
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return 0;
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/* Prepare data for writing. */
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for (i = 0; i < count; ++i) {
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int err;
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err = ntfs_mst_pre_write_fixup((NTFS_RECORD*)
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((u8*)b + i * bksize), bksize);
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if (err < 0) {
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/* Abort write at this position. */
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if (!i)
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return err;
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count = i;
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break;
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}
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}
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/* Write the prepared data. */
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written = ntfs_pwrite(dev, pos, count * bksize, b);
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/* Quickly deprotect the data again. */
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for (i = 0; i < count; ++i)
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ntfs_mst_post_write_fixup((NTFS_RECORD*)((u8*)b + i * bksize));
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if (written <= 0)
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return written;
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/* Finally, return the number of complete blocks written. */
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return written / bksize;
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}
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/**
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* ntfs_cluster_read - read ntfs clusters
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* @vol: volume to read from
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* @lcn: starting logical cluster number
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* @count: number of clusters to read
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* @b: output data buffer
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*
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* Read @count ntfs clusters starting at logical cluster number @lcn from
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* volume @vol into buffer @b. Return number of clusters read or -1 on error,
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* with errno set to the error code.
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*/
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s64 ntfs_cluster_read(const ntfs_volume *vol, const s64 lcn, const s64 count,
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void *b)
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{
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s64 br;
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if (!vol || lcn < 0 || count < 0) {
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errno = EINVAL;
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return -1;
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}
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if (vol->nr_clusters < lcn + count) {
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errno = ESPIPE;
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ntfs_log_perror("Trying to read outside of volume "
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"(%lld < %lld)", (long long)vol->nr_clusters,
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(long long)lcn + count);
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return -1;
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}
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br = ntfs_pread(vol->dev, lcn << vol->cluster_size_bits,
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count << vol->cluster_size_bits, b);
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if (br < 0) {
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ntfs_log_perror("Error reading cluster(s)");
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return br;
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}
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return br >> vol->cluster_size_bits;
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}
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/**
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* ntfs_cluster_write - write ntfs clusters
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* @vol: volume to write to
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* @lcn: starting logical cluster number
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* @count: number of clusters to write
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* @b: data buffer to write to disk
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*
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* Write @count ntfs clusters starting at logical cluster number @lcn from
|
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* buffer @b to volume @vol. Return the number of clusters written or -1 on
|
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* error, with errno set to the error code.
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*/
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s64 ntfs_cluster_write(const ntfs_volume *vol, const s64 lcn,
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const s64 count, const void *b)
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{
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s64 bw;
|
|
|
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if (!vol || lcn < 0 || count < 0) {
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errno = EINVAL;
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return -1;
|
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}
|
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if (vol->nr_clusters < lcn + count) {
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errno = ESPIPE;
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ntfs_log_perror("Trying to write outside of volume "
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"(%lld < %lld)", (long long)vol->nr_clusters,
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(long long)lcn + count);
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return -1;
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}
|
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if (!NVolReadOnly(vol))
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bw = ntfs_pwrite(vol->dev, lcn << vol->cluster_size_bits,
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count << vol->cluster_size_bits, b);
|
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else
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bw = count << vol->cluster_size_bits;
|
|
if (bw < 0) {
|
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ntfs_log_perror("Error writing cluster(s)");
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return bw;
|
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}
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return bw >> vol->cluster_size_bits;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_offset_valid - test if a device offset is valid
|
|
* @dev: open device
|
|
* @ofs: offset to test for validity
|
|
*
|
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* Test if the offset @ofs is an existing location on the device described
|
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* by the open device structure @dev.
|
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*
|
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* Return 0 if it is valid and -1 if it is not valid.
|
|
*/
|
|
static int ntfs_device_offset_valid(struct ntfs_device *dev, s64 ofs)
|
|
{
|
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char ch;
|
|
|
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if (dev->d_ops->seek(dev, ofs, SEEK_SET) >= 0 &&
|
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dev->d_ops->read(dev, &ch, 1) == 1)
|
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return 0;
|
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return -1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_size_get - return the size of a device in blocks
|
|
* @dev: open device
|
|
* @block_size: block size in bytes in which to return the result
|
|
*
|
|
* Return the number of @block_size sized blocks in the device described by the
|
|
* open device @dev.
|
|
*
|
|
* Adapted from e2fsutils-1.19, Copyright (C) 1995 Theodore Ts'o.
|
|
*
|
|
* On error return -1 with errno set to the error code.
|
|
*/
|
|
s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size)
|
|
{
|
|
s64 high, low;
|
|
|
|
if (!dev || block_size <= 0 || (block_size - 1) & block_size) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef BLKGETSIZE64
|
|
{ u64 size;
|
|
|
|
if (dev->d_ops->ioctl(dev, BLKGETSIZE64, &size) >= 0) {
|
|
ntfs_log_debug("BLKGETSIZE64 nr bytes = %llu (0x%llx)\n",
|
|
(unsigned long long)size,
|
|
(unsigned long long)size);
|
|
return (s64)size / block_size;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef BLKGETSIZE
|
|
{ unsigned long size;
|
|
|
|
if (dev->d_ops->ioctl(dev, BLKGETSIZE, &size) >= 0) {
|
|
ntfs_log_debug("BLKGETSIZE nr 512 byte blocks = %lu (0x%lx)\n",
|
|
size, size);
|
|
return (s64)size * 512 / block_size;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef FDGETPRM
|
|
{ struct floppy_struct this_floppy;
|
|
|
|
if (dev->d_ops->ioctl(dev, FDGETPRM, &this_floppy) >= 0) {
|
|
ntfs_log_debug("FDGETPRM nr 512 byte blocks = %lu (0x%lx)\n",
|
|
(unsigned long)this_floppy.size,
|
|
(unsigned long)this_floppy.size);
|
|
return (s64)this_floppy.size * 512 / block_size;
|
|
}
|
|
}
|
|
#endif
|
|
/*
|
|
* We couldn't figure it out by using a specialized ioctl,
|
|
* so do binary search to find the size of the device.
|
|
*/
|
|
low = 0LL;
|
|
for (high = 1024LL; !ntfs_device_offset_valid(dev, high); high <<= 1)
|
|
low = high;
|
|
while (low < high - 1LL) {
|
|
const s64 mid = (low + high) / 2;
|
|
|
|
if (!ntfs_device_offset_valid(dev, mid))
|
|
low = mid;
|
|
else
|
|
high = mid;
|
|
}
|
|
dev->d_ops->seek(dev, 0LL, SEEK_SET);
|
|
return (low + 1LL) / block_size;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_partition_start_sector_get - get starting sector of a partition
|
|
* @dev: open device
|
|
*
|
|
* On success, return the starting sector of the partition @dev in the parent
|
|
* block device of @dev. On error return -1 with errno set to the error code.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL Input parameter error
|
|
* EOPNOTSUPP System does not support HDIO_GETGEO ioctl
|
|
* ENOTTY @dev is a file or a device not supporting HDIO_GETGEO
|
|
*/
|
|
s64 ntfs_device_partition_start_sector_get(struct ntfs_device *dev)
|
|
{
|
|
if (!dev) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef HDIO_GETGEO
|
|
{ struct hd_geometry geo;
|
|
|
|
if (!dev->d_ops->ioctl(dev, HDIO_GETGEO, &geo)) {
|
|
ntfs_log_debug("HDIO_GETGEO start_sect = %lu (0x%lx)\n",
|
|
geo.start, geo.start);
|
|
return geo.start;
|
|
}
|
|
}
|
|
#else
|
|
errno = EOPNOTSUPP;
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_heads_get - get number of heads of device
|
|
* @dev: open device
|
|
*
|
|
* On success, return the number of heads on the device @dev. On error return
|
|
* -1 with errno set to the error code.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL Input parameter error
|
|
* EOPNOTSUPP System does not support HDIO_GETGEO ioctl
|
|
* ENOTTY @dev is a file or a device not supporting HDIO_GETGEO
|
|
*/
|
|
int ntfs_device_heads_get(struct ntfs_device *dev)
|
|
{
|
|
if (!dev) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef HDIO_GETGEO
|
|
{ struct hd_geometry geo;
|
|
|
|
if (!dev->d_ops->ioctl(dev, HDIO_GETGEO, &geo)) {
|
|
ntfs_log_debug("HDIO_GETGEO heads = %u (0x%x)\n",
|
|
(unsigned)geo.heads,
|
|
(unsigned)geo.heads);
|
|
return geo.heads;
|
|
}
|
|
}
|
|
#else
|
|
errno = EOPNOTSUPP;
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_sectors_per_track_get - get number of sectors per track of device
|
|
* @dev: open device
|
|
*
|
|
* On success, return the number of sectors per track on the device @dev. On
|
|
* error return -1 with errno set to the error code.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL Input parameter error
|
|
* EOPNOTSUPP System does not support HDIO_GETGEO ioctl
|
|
* ENOTTY @dev is a file or a device not supporting HDIO_GETGEO
|
|
*/
|
|
int ntfs_device_sectors_per_track_get(struct ntfs_device *dev)
|
|
{
|
|
if (!dev) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef HDIO_GETGEO
|
|
{ struct hd_geometry geo;
|
|
|
|
if (!dev->d_ops->ioctl(dev, HDIO_GETGEO, &geo)) {
|
|
ntfs_log_debug("HDIO_GETGEO sectors_per_track = %u (0x%x)\n",
|
|
(unsigned)geo.sectors,
|
|
(unsigned)geo.sectors);
|
|
return geo.sectors;
|
|
}
|
|
}
|
|
#else
|
|
errno = EOPNOTSUPP;
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_sector_size_get - get sector size of a device
|
|
* @dev: open device
|
|
*
|
|
* On success, return the sector size in bytes of the device @dev.
|
|
* On error return -1 with errno set to the error code.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL Input parameter error
|
|
* EOPNOTSUPP System does not support BLKSSZGET ioctl
|
|
* ENOTTY @dev is a file or a device not supporting BLKSSZGET
|
|
*/
|
|
int ntfs_device_sector_size_get(struct ntfs_device *dev)
|
|
{
|
|
if (!dev) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef BLKSSZGET
|
|
{
|
|
int sect_size = 0;
|
|
|
|
if (!dev->d_ops->ioctl(dev, BLKSSZGET, §_size)) {
|
|
ntfs_log_debug("BLKSSZGET sector size = %d bytes\n",
|
|
sect_size);
|
|
return sect_size;
|
|
}
|
|
}
|
|
#else
|
|
errno = EOPNOTSUPP;
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_device_block_size_set - set block size of a device
|
|
* @dev: open device
|
|
* @block_size: block size to set @dev to
|
|
*
|
|
* On success, return 0.
|
|
* On error return -1 with errno set to the error code.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL Input parameter error
|
|
* EOPNOTSUPP System does not support BLKBSZSET ioctl
|
|
* ENOTTY @dev is a file or a device not supporting BLKBSZSET
|
|
*/
|
|
int ntfs_device_block_size_set(struct ntfs_device *dev,
|
|
int block_size __attribute__((unused)))
|
|
{
|
|
if (!dev) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
#ifdef BLKBSZSET
|
|
{
|
|
size_t s_block_size = block_size;
|
|
if (!dev->d_ops->ioctl(dev, BLKBSZSET, &s_block_size)) {
|
|
ntfs_log_debug("Used BLKBSZSET to set block size to "
|
|
"%d bytes.\n", block_size);
|
|
return 0;
|
|
}
|
|
/* If not a block device, pretend it was successful. */
|
|
if (!NDevBlock(dev))
|
|
return 0;
|
|
}
|
|
#else
|
|
/* If not a block device, pretend it was successful. */
|
|
if (!NDevBlock(dev))
|
|
return 0;
|
|
errno = EOPNOTSUPP;
|
|
#endif
|
|
return -1;
|
|
}
|