1789 lines
45 KiB
C
1789 lines
45 KiB
C
/*
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* Block driver for RAW files (posix)
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*
|
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* Copyright (c) 2006 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "qemu-timer.h"
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#include "qemu-char.h"
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#include "qemu-log.h"
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#include "block_int.h"
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#include "module.h"
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#include "trace.h"
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#include "thread-pool.h"
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#include "iov.h"
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#include "raw-aio.h"
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#if defined(__APPLE__) && (__MACH__)
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#include <paths.h>
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#include <sys/param.h>
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#include <IOKit/IOKitLib.h>
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#include <IOKit/IOBSD.h>
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#include <IOKit/storage/IOMediaBSDClient.h>
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#include <IOKit/storage/IOMedia.h>
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#include <IOKit/storage/IOCDMedia.h>
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//#include <IOKit/storage/IOCDTypes.h>
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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#ifdef __sun__
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#define _POSIX_PTHREAD_SEMANTICS 1
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#include <sys/dkio.h>
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#endif
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#ifdef __linux__
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <linux/cdrom.h>
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#include <linux/fd.h>
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#include <linux/fs.h>
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#endif
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#ifdef CONFIG_FIEMAP
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#include <linux/fiemap.h>
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#endif
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#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
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#include <sys/disk.h>
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#include <sys/cdio.h>
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#endif
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#ifdef __OpenBSD__
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#include <sys/ioctl.h>
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#include <sys/disklabel.h>
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#include <sys/dkio.h>
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#endif
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#ifdef __NetBSD__
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#include <sys/ioctl.h>
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#include <sys/disklabel.h>
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#include <sys/dkio.h>
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#include <sys/disk.h>
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#endif
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#ifdef __DragonFly__
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#include <sys/ioctl.h>
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#include <sys/diskslice.h>
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#endif
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#ifdef CONFIG_XFS
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#include <xfs/xfs.h>
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#endif
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//#define DEBUG_FLOPPY
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//#define DEBUG_BLOCK
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#if defined(DEBUG_BLOCK)
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#define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
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{ qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
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#else
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#define DEBUG_BLOCK_PRINT(formatCstr, ...)
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#endif
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/* OS X does not have O_DSYNC */
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#ifndef O_DSYNC
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#ifdef O_SYNC
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#define O_DSYNC O_SYNC
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#elif defined(O_FSYNC)
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#define O_DSYNC O_FSYNC
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#endif
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#endif
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/* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
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#ifndef O_DIRECT
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#define O_DIRECT O_DSYNC
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#endif
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#define FTYPE_FILE 0
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#define FTYPE_CD 1
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#define FTYPE_FD 2
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/* if the FD is not accessed during that time (in ns), we try to
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reopen it to see if the disk has been changed */
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#define FD_OPEN_TIMEOUT (1000000000)
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#define MAX_BLOCKSIZE 4096
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typedef struct BDRVRawState {
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int fd;
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int type;
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int open_flags;
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#if defined(__linux__)
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/* linux floppy specific */
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int64_t fd_open_time;
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int64_t fd_error_time;
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int fd_got_error;
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int fd_media_changed;
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#endif
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#ifdef CONFIG_LINUX_AIO
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int use_aio;
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void *aio_ctx;
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#endif
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#ifdef CONFIG_XFS
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bool is_xfs : 1;
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#endif
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} BDRVRawState;
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typedef struct BDRVRawReopenState {
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int fd;
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int open_flags;
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#ifdef CONFIG_LINUX_AIO
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int use_aio;
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#endif
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} BDRVRawReopenState;
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static int fd_open(BlockDriverState *bs);
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static int64_t raw_getlength(BlockDriverState *bs);
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typedef struct RawPosixAIOData {
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BlockDriverState *bs;
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int aio_fildes;
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union {
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struct iovec *aio_iov;
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void *aio_ioctl_buf;
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};
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int aio_niov;
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size_t aio_nbytes;
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#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
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off_t aio_offset;
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int aio_type;
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} RawPosixAIOData;
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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static int cdrom_reopen(BlockDriverState *bs);
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#endif
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#if defined(__NetBSD__)
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static int raw_normalize_devicepath(const char **filename)
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{
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static char namebuf[PATH_MAX];
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const char *dp, *fname;
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struct stat sb;
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fname = *filename;
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dp = strrchr(fname, '/');
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if (lstat(fname, &sb) < 0) {
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fprintf(stderr, "%s: stat failed: %s\n",
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fname, strerror(errno));
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return -errno;
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}
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if (!S_ISBLK(sb.st_mode)) {
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return 0;
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}
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if (dp == NULL) {
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snprintf(namebuf, PATH_MAX, "r%s", fname);
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} else {
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snprintf(namebuf, PATH_MAX, "%.*s/r%s",
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(int)(dp - fname), fname, dp + 1);
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}
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fprintf(stderr, "%s is a block device", fname);
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*filename = namebuf;
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fprintf(stderr, ", using %s\n", *filename);
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return 0;
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}
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#else
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static int raw_normalize_devicepath(const char **filename)
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{
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return 0;
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}
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#endif
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static void raw_parse_flags(int bdrv_flags, int *open_flags)
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{
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assert(open_flags != NULL);
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*open_flags |= O_BINARY;
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*open_flags &= ~O_ACCMODE;
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if (bdrv_flags & BDRV_O_RDWR) {
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*open_flags |= O_RDWR;
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} else {
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*open_flags |= O_RDONLY;
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}
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/* Use O_DSYNC for write-through caching, no flags for write-back caching,
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* and O_DIRECT for no caching. */
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if ((bdrv_flags & BDRV_O_NOCACHE)) {
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*open_flags |= O_DIRECT;
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}
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}
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#ifdef CONFIG_LINUX_AIO
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static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags)
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{
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int ret = -1;
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assert(aio_ctx != NULL);
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assert(use_aio != NULL);
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/*
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* Currently Linux do AIO only for files opened with O_DIRECT
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* specified so check NOCACHE flag too
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*/
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if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
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(BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
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/* if non-NULL, laio_init() has already been run */
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if (*aio_ctx == NULL) {
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*aio_ctx = laio_init();
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if (!*aio_ctx) {
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goto error;
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}
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}
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*use_aio = 1;
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} else {
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*use_aio = 0;
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}
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ret = 0;
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error:
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return ret;
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}
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#endif
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static int raw_open_common(BlockDriverState *bs, const char *filename,
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int bdrv_flags, int open_flags)
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{
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BDRVRawState *s = bs->opaque;
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int fd, ret;
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ret = raw_normalize_devicepath(&filename);
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if (ret != 0) {
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return ret;
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}
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s->open_flags = open_flags;
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raw_parse_flags(bdrv_flags, &s->open_flags);
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s->fd = -1;
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fd = qemu_open(filename, s->open_flags, 0644);
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if (fd < 0) {
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ret = -errno;
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if (ret == -EROFS)
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ret = -EACCES;
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return ret;
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}
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s->fd = fd;
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#ifdef CONFIG_LINUX_AIO
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if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
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qemu_close(fd);
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return -errno;
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}
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#endif
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#ifdef CONFIG_XFS
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if (platform_test_xfs_fd(s->fd)) {
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s->is_xfs = 1;
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}
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#endif
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return 0;
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}
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static int raw_open(BlockDriverState *bs, const char *filename, int flags)
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{
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BDRVRawState *s = bs->opaque;
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s->type = FTYPE_FILE;
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return raw_open_common(bs, filename, flags, 0);
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}
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static int raw_reopen_prepare(BDRVReopenState *state,
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BlockReopenQueue *queue, Error **errp)
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{
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BDRVRawState *s;
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BDRVRawReopenState *raw_s;
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int ret = 0;
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assert(state != NULL);
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assert(state->bs != NULL);
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s = state->bs->opaque;
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state->opaque = g_malloc0(sizeof(BDRVRawReopenState));
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raw_s = state->opaque;
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#ifdef CONFIG_LINUX_AIO
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raw_s->use_aio = s->use_aio;
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/* we can use s->aio_ctx instead of a copy, because the use_aio flag is
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* valid in the 'false' condition even if aio_ctx is set, and raw_set_aio()
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* won't override aio_ctx if aio_ctx is non-NULL */
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if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) {
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return -1;
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}
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#endif
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raw_parse_flags(state->flags, &raw_s->open_flags);
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raw_s->fd = -1;
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|
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int fcntl_flags = O_APPEND | O_ASYNC | O_NONBLOCK;
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#ifdef O_NOATIME
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fcntl_flags |= O_NOATIME;
|
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#endif
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if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
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/* dup the original fd */
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/* TODO: use qemu fcntl wrapper */
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#ifdef F_DUPFD_CLOEXEC
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raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0);
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#else
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raw_s->fd = dup(s->fd);
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if (raw_s->fd != -1) {
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qemu_set_cloexec(raw_s->fd);
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}
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#endif
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if (raw_s->fd >= 0) {
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ret = fcntl_setfl(raw_s->fd, raw_s->open_flags);
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if (ret) {
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qemu_close(raw_s->fd);
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raw_s->fd = -1;
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}
|
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}
|
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}
|
|
|
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/* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
|
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if (raw_s->fd == -1) {
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assert(!(raw_s->open_flags & O_CREAT));
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raw_s->fd = qemu_open(state->bs->filename, raw_s->open_flags);
|
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if (raw_s->fd == -1) {
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ret = -1;
|
|
}
|
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}
|
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return ret;
|
|
}
|
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|
|
|
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static void raw_reopen_commit(BDRVReopenState *state)
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{
|
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BDRVRawReopenState *raw_s = state->opaque;
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BDRVRawState *s = state->bs->opaque;
|
|
|
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s->open_flags = raw_s->open_flags;
|
|
|
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qemu_close(s->fd);
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s->fd = raw_s->fd;
|
|
#ifdef CONFIG_LINUX_AIO
|
|
s->use_aio = raw_s->use_aio;
|
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#endif
|
|
|
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g_free(state->opaque);
|
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state->opaque = NULL;
|
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}
|
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|
|
|
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static void raw_reopen_abort(BDRVReopenState *state)
|
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{
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BDRVRawReopenState *raw_s = state->opaque;
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|
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/* nothing to do if NULL, we didn't get far enough */
|
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if (raw_s == NULL) {
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return;
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}
|
|
|
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if (raw_s->fd >= 0) {
|
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qemu_close(raw_s->fd);
|
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raw_s->fd = -1;
|
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}
|
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g_free(state->opaque);
|
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state->opaque = NULL;
|
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}
|
|
|
|
|
|
/* XXX: use host sector size if necessary with:
|
|
#ifdef DIOCGSECTORSIZE
|
|
{
|
|
unsigned int sectorsize = 512;
|
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if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) &&
|
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sectorsize > bufsize)
|
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bufsize = sectorsize;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_COCOA
|
|
uint32_t blockSize = 512;
|
|
if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
|
|
bufsize = blockSize;
|
|
}
|
|
#endif
|
|
*/
|
|
|
|
/*
|
|
* Check if all memory in this vector is sector aligned.
|
|
*/
|
|
static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < qiov->niov; i++) {
|
|
if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
|
|
{
|
|
int ret;
|
|
|
|
ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf);
|
|
if (ret == -1) {
|
|
return -errno;
|
|
}
|
|
|
|
/*
|
|
* This looks weird, but the aio code only considers a request
|
|
* successful if it has written the full number of bytes.
|
|
*
|
|
* Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
|
|
* so in fact we return the ioctl command here to make posix_aio_read()
|
|
* happy..
|
|
*/
|
|
return aiocb->aio_nbytes;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
|
|
{
|
|
int ret;
|
|
|
|
ret = qemu_fdatasync(aiocb->aio_fildes);
|
|
if (ret == -1) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PREADV
|
|
|
|
static bool preadv_present = true;
|
|
|
|
static ssize_t
|
|
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
|
|
{
|
|
return preadv(fd, iov, nr_iov, offset);
|
|
}
|
|
|
|
static ssize_t
|
|
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
|
|
{
|
|
return pwritev(fd, iov, nr_iov, offset);
|
|
}
|
|
|
|
#else
|
|
|
|
static bool preadv_present = false;
|
|
|
|
static ssize_t
|
|
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static ssize_t
|
|
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif
|
|
|
|
static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
|
|
{
|
|
ssize_t len;
|
|
|
|
do {
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE)
|
|
len = qemu_pwritev(aiocb->aio_fildes,
|
|
aiocb->aio_iov,
|
|
aiocb->aio_niov,
|
|
aiocb->aio_offset);
|
|
else
|
|
len = qemu_preadv(aiocb->aio_fildes,
|
|
aiocb->aio_iov,
|
|
aiocb->aio_niov,
|
|
aiocb->aio_offset);
|
|
} while (len == -1 && errno == EINTR);
|
|
|
|
if (len == -1) {
|
|
return -errno;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Read/writes the data to/from a given linear buffer.
|
|
*
|
|
* Returns the number of bytes handles or -errno in case of an error. Short
|
|
* reads are only returned if the end of the file is reached.
|
|
*/
|
|
static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
|
|
{
|
|
ssize_t offset = 0;
|
|
ssize_t len;
|
|
|
|
while (offset < aiocb->aio_nbytes) {
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
|
len = pwrite(aiocb->aio_fildes,
|
|
(const char *)buf + offset,
|
|
aiocb->aio_nbytes - offset,
|
|
aiocb->aio_offset + offset);
|
|
} else {
|
|
len = pread(aiocb->aio_fildes,
|
|
buf + offset,
|
|
aiocb->aio_nbytes - offset,
|
|
aiocb->aio_offset + offset);
|
|
}
|
|
if (len == -1 && errno == EINTR) {
|
|
continue;
|
|
} else if (len == -1) {
|
|
offset = -errno;
|
|
break;
|
|
} else if (len == 0) {
|
|
break;
|
|
}
|
|
offset += len;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
|
|
{
|
|
ssize_t nbytes;
|
|
char *buf;
|
|
|
|
if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
|
|
/*
|
|
* If there is just a single buffer, and it is properly aligned
|
|
* we can just use plain pread/pwrite without any problems.
|
|
*/
|
|
if (aiocb->aio_niov == 1) {
|
|
return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
|
|
}
|
|
/*
|
|
* We have more than one iovec, and all are properly aligned.
|
|
*
|
|
* Try preadv/pwritev first and fall back to linearizing the
|
|
* buffer if it's not supported.
|
|
*/
|
|
if (preadv_present) {
|
|
nbytes = handle_aiocb_rw_vector(aiocb);
|
|
if (nbytes == aiocb->aio_nbytes ||
|
|
(nbytes < 0 && nbytes != -ENOSYS)) {
|
|
return nbytes;
|
|
}
|
|
preadv_present = false;
|
|
}
|
|
|
|
/*
|
|
* XXX(hch): short read/write. no easy way to handle the reminder
|
|
* using these interfaces. For now retry using plain
|
|
* pread/pwrite?
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Ok, we have to do it the hard way, copy all segments into
|
|
* a single aligned buffer.
|
|
*/
|
|
buf = qemu_blockalign(aiocb->bs, aiocb->aio_nbytes);
|
|
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
|
char *p = buf;
|
|
int i;
|
|
|
|
for (i = 0; i < aiocb->aio_niov; ++i) {
|
|
memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len);
|
|
p += aiocb->aio_iov[i].iov_len;
|
|
}
|
|
}
|
|
|
|
nbytes = handle_aiocb_rw_linear(aiocb, buf);
|
|
if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
|
|
char *p = buf;
|
|
size_t count = aiocb->aio_nbytes, copy;
|
|
int i;
|
|
|
|
for (i = 0; i < aiocb->aio_niov && count; ++i) {
|
|
copy = count;
|
|
if (copy > aiocb->aio_iov[i].iov_len) {
|
|
copy = aiocb->aio_iov[i].iov_len;
|
|
}
|
|
memcpy(aiocb->aio_iov[i].iov_base, p, copy);
|
|
p += copy;
|
|
count -= copy;
|
|
}
|
|
}
|
|
qemu_vfree(buf);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static int aio_worker(void *arg)
|
|
{
|
|
RawPosixAIOData *aiocb = arg;
|
|
ssize_t ret = 0;
|
|
|
|
switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
|
|
case QEMU_AIO_READ:
|
|
ret = handle_aiocb_rw(aiocb);
|
|
if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->bs->growable) {
|
|
iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
|
|
0, aiocb->aio_nbytes - ret);
|
|
|
|
ret = aiocb->aio_nbytes;
|
|
}
|
|
if (ret == aiocb->aio_nbytes) {
|
|
ret = 0;
|
|
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
|
|
ret = -EINVAL;
|
|
}
|
|
break;
|
|
case QEMU_AIO_WRITE:
|
|
ret = handle_aiocb_rw(aiocb);
|
|
if (ret == aiocb->aio_nbytes) {
|
|
ret = 0;
|
|
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
|
|
ret = -EINVAL;
|
|
}
|
|
break;
|
|
case QEMU_AIO_FLUSH:
|
|
ret = handle_aiocb_flush(aiocb);
|
|
break;
|
|
case QEMU_AIO_IOCTL:
|
|
ret = handle_aiocb_ioctl(aiocb);
|
|
break;
|
|
default:
|
|
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
g_slice_free(RawPosixAIOData, aiocb);
|
|
return ret;
|
|
}
|
|
|
|
static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque, int type)
|
|
{
|
|
RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
|
|
|
|
acb->bs = bs;
|
|
acb->aio_type = type;
|
|
acb->aio_fildes = fd;
|
|
|
|
if (qiov) {
|
|
acb->aio_iov = qiov->iov;
|
|
acb->aio_niov = qiov->niov;
|
|
}
|
|
acb->aio_nbytes = nb_sectors * 512;
|
|
acb->aio_offset = sector_num * 512;
|
|
|
|
trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
|
|
return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
|
|
}
|
|
|
|
static BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
|
|
unsigned long int req, void *buf,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
|
|
|
|
acb->bs = bs;
|
|
acb->aio_type = QEMU_AIO_IOCTL;
|
|
acb->aio_fildes = fd;
|
|
acb->aio_offset = 0;
|
|
acb->aio_ioctl_buf = buf;
|
|
acb->aio_ioctl_cmd = req;
|
|
|
|
return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
|
|
}
|
|
|
|
static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque, int type)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return NULL;
|
|
|
|
/*
|
|
* If O_DIRECT is used the buffer needs to be aligned on a sector
|
|
* boundary. Check if this is the case or tell the low-level
|
|
* driver that it needs to copy the buffer.
|
|
*/
|
|
if ((bs->open_flags & BDRV_O_NOCACHE)) {
|
|
if (!qiov_is_aligned(bs, qiov)) {
|
|
type |= QEMU_AIO_MISALIGNED;
|
|
#ifdef CONFIG_LINUX_AIO
|
|
} else if (s->use_aio) {
|
|
return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
|
|
nb_sectors, cb, opaque, type);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
|
|
cb, opaque, type);
|
|
}
|
|
|
|
static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque, QEMU_AIO_READ);
|
|
}
|
|
|
|
static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque, QEMU_AIO_WRITE);
|
|
}
|
|
|
|
static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return NULL;
|
|
|
|
return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
|
|
}
|
|
|
|
static void raw_close(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->fd >= 0) {
|
|
qemu_close(s->fd);
|
|
s->fd = -1;
|
|
}
|
|
}
|
|
|
|
static int raw_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
|
|
if (fstat(s->fd, &st)) {
|
|
return -errno;
|
|
}
|
|
|
|
if (S_ISREG(st.st_mode)) {
|
|
if (ftruncate(s->fd, offset) < 0) {
|
|
return -errno;
|
|
}
|
|
} else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
if (offset > raw_getlength(bs)) {
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __OpenBSD__
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st))
|
|
return -1;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -1;
|
|
return (uint64_t)dl.d_secsize *
|
|
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
|
|
} else
|
|
return st.st_size;
|
|
}
|
|
#elif defined(__NetBSD__)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st))
|
|
return -1;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct dkwedge_info dkw;
|
|
|
|
if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
|
|
return dkw.dkw_size * 512;
|
|
} else {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -1;
|
|
return (uint64_t)dl.d_secsize *
|
|
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
|
|
}
|
|
} else
|
|
return st.st_size;
|
|
}
|
|
#elif defined(__sun__)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct dk_minfo minfo;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Use the DKIOCGMEDIAINFO ioctl to read the size.
|
|
*/
|
|
ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
|
|
if (ret != -1) {
|
|
return minfo.dki_lbsize * minfo.dki_capacity;
|
|
}
|
|
|
|
/*
|
|
* There are reports that lseek on some devices fails, but
|
|
* irc discussion said that contingency on contingency was overkill.
|
|
*/
|
|
return lseek(s->fd, 0, SEEK_END);
|
|
}
|
|
#elif defined(CONFIG_BSD)
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd = s->fd;
|
|
int64_t size;
|
|
struct stat sb;
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
int reopened = 0;
|
|
#endif
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
again:
|
|
#endif
|
|
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
|
|
#ifdef DIOCGMEDIASIZE
|
|
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
|
|
#elif defined(DIOCGPART)
|
|
{
|
|
struct partinfo pi;
|
|
if (ioctl(fd, DIOCGPART, &pi) == 0)
|
|
size = pi.media_size;
|
|
else
|
|
size = 0;
|
|
}
|
|
if (size == 0)
|
|
#endif
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
size = LONG_LONG_MAX;
|
|
#else
|
|
size = lseek(fd, 0LL, SEEK_END);
|
|
#endif
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
switch(s->type) {
|
|
case FTYPE_CD:
|
|
/* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
|
|
if (size == 2048LL * (unsigned)-1)
|
|
size = 0;
|
|
/* XXX no disc? maybe we need to reopen... */
|
|
if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
|
|
reopened = 1;
|
|
goto again;
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
size = lseek(fd, 0, SEEK_END);
|
|
}
|
|
return size;
|
|
}
|
|
#else
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return lseek(s->fd, 0, SEEK_END);
|
|
}
|
|
#endif
|
|
|
|
static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
struct stat st;
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fstat(s->fd, &st) < 0) {
|
|
return -errno;
|
|
}
|
|
return (int64_t)st.st_blocks * 512;
|
|
}
|
|
|
|
static int raw_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int fd;
|
|
int result = 0;
|
|
int64_t total_size = 0;
|
|
|
|
/* Read out options */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
total_size = options->value.n / BDRV_SECTOR_SIZE;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
|
|
0644);
|
|
if (fd < 0) {
|
|
result = -errno;
|
|
} else {
|
|
if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
|
|
result = -errno;
|
|
}
|
|
if (qemu_close(fd) != 0) {
|
|
result = -errno;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Returns true iff the specified sector is present in the disk image. Drivers
|
|
* not implementing the functionality are assumed to not support backing files,
|
|
* hence all their sectors are reported as allocated.
|
|
*
|
|
* If 'sector_num' is beyond the end of the disk image the return value is 0
|
|
* and 'pnum' is set to 0.
|
|
*
|
|
* 'pnum' is set to the number of sectors (including and immediately following
|
|
* the specified sector) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
|
|
* beyond the end of the disk image it will be clamped.
|
|
*/
|
|
static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
off_t start, data, hole;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
start = sector_num * BDRV_SECTOR_SIZE;
|
|
|
|
#ifdef CONFIG_FIEMAP
|
|
|
|
BDRVRawState *s = bs->opaque;
|
|
struct {
|
|
struct fiemap fm;
|
|
struct fiemap_extent fe;
|
|
} f;
|
|
|
|
f.fm.fm_start = start;
|
|
f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
|
|
f.fm.fm_flags = 0;
|
|
f.fm.fm_extent_count = 1;
|
|
f.fm.fm_reserved = 0;
|
|
if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
|
|
/* Assume everything is allocated. */
|
|
*pnum = nb_sectors;
|
|
return 1;
|
|
}
|
|
|
|
if (f.fm.fm_mapped_extents == 0) {
|
|
/* No extents found, data is beyond f.fm.fm_start + f.fm.fm_length.
|
|
* f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
|
|
*/
|
|
off_t length = lseek(s->fd, 0, SEEK_END);
|
|
hole = f.fm.fm_start;
|
|
data = MIN(f.fm.fm_start + f.fm.fm_length, length);
|
|
} else {
|
|
data = f.fe.fe_logical;
|
|
hole = f.fe.fe_logical + f.fe.fe_length;
|
|
}
|
|
|
|
#elif defined SEEK_HOLE && defined SEEK_DATA
|
|
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
hole = lseek(s->fd, start, SEEK_HOLE);
|
|
if (hole == -1) {
|
|
/* -ENXIO indicates that sector_num was past the end of the file.
|
|
* There is a virtual hole there. */
|
|
assert(errno != -ENXIO);
|
|
|
|
/* Most likely EINVAL. Assume everything is allocated. */
|
|
*pnum = nb_sectors;
|
|
return 1;
|
|
}
|
|
|
|
if (hole > start) {
|
|
data = start;
|
|
} else {
|
|
/* On a hole. We need another syscall to find its end. */
|
|
data = lseek(s->fd, start, SEEK_DATA);
|
|
if (data == -1) {
|
|
data = lseek(s->fd, 0, SEEK_END);
|
|
}
|
|
}
|
|
#else
|
|
*pnum = nb_sectors;
|
|
return 1;
|
|
#endif
|
|
|
|
if (data <= start) {
|
|
/* On a data extent, compute sectors to the end of the extent. */
|
|
*pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
|
|
return 1;
|
|
} else {
|
|
/* On a hole, compute sectors to the beginning of the next extent. */
|
|
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_XFS
|
|
static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
|
|
{
|
|
struct xfs_flock64 fl;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.l_whence = SEEK_SET;
|
|
fl.l_start = sector_num << 9;
|
|
fl.l_len = (int64_t)nb_sectors << 9;
|
|
|
|
if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
|
|
DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static coroutine_fn int raw_co_discard(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors)
|
|
{
|
|
#ifdef CONFIG_XFS
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (s->is_xfs) {
|
|
return xfs_discard(s, sector_num, nb_sectors);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static QEMUOptionParameter raw_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_file = {
|
|
.format_name = "file",
|
|
.protocol_name = "file",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe = NULL, /* no probe for protocols */
|
|
.bdrv_file_open = raw_open,
|
|
.bdrv_reopen_prepare = raw_reopen_prepare,
|
|
.bdrv_reopen_commit = raw_reopen_commit,
|
|
.bdrv_reopen_abort = raw_reopen_abort,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_create = raw_create,
|
|
.bdrv_co_discard = raw_co_discard,
|
|
.bdrv_co_is_allocated = raw_co_is_allocated,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
.create_options = raw_create_options,
|
|
};
|
|
|
|
/***********************************************/
|
|
/* host device */
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
|
|
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
|
|
|
|
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
|
|
{
|
|
kern_return_t kernResult;
|
|
mach_port_t masterPort;
|
|
CFMutableDictionaryRef classesToMatch;
|
|
|
|
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
|
|
if ( KERN_SUCCESS != kernResult ) {
|
|
printf( "IOMasterPort returned %d\n", kernResult );
|
|
}
|
|
|
|
classesToMatch = IOServiceMatching( kIOCDMediaClass );
|
|
if ( classesToMatch == NULL ) {
|
|
printf( "IOServiceMatching returned a NULL dictionary.\n" );
|
|
} else {
|
|
CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
|
|
}
|
|
kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
|
|
if ( KERN_SUCCESS != kernResult )
|
|
{
|
|
printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
|
|
}
|
|
|
|
return kernResult;
|
|
}
|
|
|
|
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
|
|
{
|
|
io_object_t nextMedia;
|
|
kern_return_t kernResult = KERN_FAILURE;
|
|
*bsdPath = '\0';
|
|
nextMedia = IOIteratorNext( mediaIterator );
|
|
if ( nextMedia )
|
|
{
|
|
CFTypeRef bsdPathAsCFString;
|
|
bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
|
|
if ( bsdPathAsCFString ) {
|
|
size_t devPathLength;
|
|
strcpy( bsdPath, _PATH_DEV );
|
|
strcat( bsdPath, "r" );
|
|
devPathLength = strlen( bsdPath );
|
|
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
|
|
kernResult = KERN_SUCCESS;
|
|
}
|
|
CFRelease( bsdPathAsCFString );
|
|
}
|
|
IOObjectRelease( nextMedia );
|
|
}
|
|
|
|
return kernResult;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int hdev_probe_device(const char *filename)
|
|
{
|
|
struct stat st;
|
|
|
|
/* allow a dedicated CD-ROM driver to match with a higher priority */
|
|
if (strstart(filename, "/dev/cdrom", NULL))
|
|
return 50;
|
|
|
|
if (stat(filename, &st) >= 0 &&
|
|
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
|
|
return 100;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
if (strstart(filename, "/dev/cdrom", NULL)) {
|
|
kern_return_t kernResult;
|
|
io_iterator_t mediaIterator;
|
|
char bsdPath[ MAXPATHLEN ];
|
|
int fd;
|
|
|
|
kernResult = FindEjectableCDMedia( &mediaIterator );
|
|
kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
|
|
|
|
if ( bsdPath[ 0 ] != '\0' ) {
|
|
strcat(bsdPath,"s0");
|
|
/* some CDs don't have a partition 0 */
|
|
fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
|
|
if (fd < 0) {
|
|
bsdPath[strlen(bsdPath)-1] = '1';
|
|
} else {
|
|
qemu_close(fd);
|
|
}
|
|
filename = bsdPath;
|
|
}
|
|
|
|
if ( mediaIterator )
|
|
IOObjectRelease( mediaIterator );
|
|
}
|
|
#endif
|
|
|
|
s->type = FTYPE_FILE;
|
|
#if defined(__linux__)
|
|
{
|
|
char resolved_path[ MAXPATHLEN ], *temp;
|
|
|
|
temp = realpath(filename, resolved_path);
|
|
if (temp && strstart(temp, "/dev/sg", NULL)) {
|
|
bs->sg = 1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return raw_open_common(bs, filename, flags, 0);
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
/* Note: we do not have a reliable method to detect if the floppy is
|
|
present. The current method is to try to open the floppy at every
|
|
I/O and to keep it opened during a few hundreds of ms. */
|
|
static int fd_open(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int last_media_present;
|
|
|
|
if (s->type != FTYPE_FD)
|
|
return 0;
|
|
last_media_present = (s->fd >= 0);
|
|
if (s->fd >= 0 &&
|
|
(get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
|
|
qemu_close(s->fd);
|
|
s->fd = -1;
|
|
#ifdef DEBUG_FLOPPY
|
|
printf("Floppy closed\n");
|
|
#endif
|
|
}
|
|
if (s->fd < 0) {
|
|
if (s->fd_got_error &&
|
|
(get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
|
|
#ifdef DEBUG_FLOPPY
|
|
printf("No floppy (open delayed)\n");
|
|
#endif
|
|
return -EIO;
|
|
}
|
|
s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
|
|
if (s->fd < 0) {
|
|
s->fd_error_time = get_clock();
|
|
s->fd_got_error = 1;
|
|
if (last_media_present)
|
|
s->fd_media_changed = 1;
|
|
#ifdef DEBUG_FLOPPY
|
|
printf("No floppy\n");
|
|
#endif
|
|
return -EIO;
|
|
}
|
|
#ifdef DEBUG_FLOPPY
|
|
printf("Floppy opened\n");
|
|
#endif
|
|
}
|
|
if (!last_media_present)
|
|
s->fd_media_changed = 1;
|
|
s->fd_open_time = get_clock();
|
|
s->fd_got_error = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
return ioctl(s->fd, req, buf);
|
|
}
|
|
|
|
static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
|
|
unsigned long int req, void *buf,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return NULL;
|
|
return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
|
|
}
|
|
|
|
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
static int fd_open(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
/* this is just to ensure s->fd is sane (its called by io ops) */
|
|
if (s->fd >= 0)
|
|
return 0;
|
|
return -EIO;
|
|
}
|
|
#else /* !linux && !FreeBSD */
|
|
|
|
static int fd_open(BlockDriverState *bs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* !linux && !FreeBSD */
|
|
|
|
static int hdev_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int fd;
|
|
int ret = 0;
|
|
struct stat stat_buf;
|
|
int64_t total_size = 0;
|
|
|
|
/* Read out options */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, "size")) {
|
|
total_size = options->value.n / BDRV_SECTOR_SIZE;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
fd = qemu_open(filename, O_WRONLY | O_BINARY);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
if (fstat(fd, &stat_buf) < 0)
|
|
ret = -errno;
|
|
else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
|
|
ret = -ENODEV;
|
|
else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
|
|
ret = -ENOSPC;
|
|
|
|
qemu_close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int hdev_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static BlockDriver bdrv_host_device = {
|
|
.format_name = "host_device",
|
|
.protocol_name = "host_device",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe_device = hdev_probe_device,
|
|
.bdrv_file_open = hdev_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_create = hdev_create,
|
|
.create_options = raw_create_options,
|
|
.bdrv_has_zero_init = hdev_has_zero_init,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* generic scsi device */
|
|
#ifdef __linux__
|
|
.bdrv_ioctl = hdev_ioctl,
|
|
.bdrv_aio_ioctl = hdev_aio_ioctl,
|
|
#endif
|
|
};
|
|
|
|
#ifdef __linux__
|
|
static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
s->type = FTYPE_FD;
|
|
|
|
/* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
|
|
ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* close fd so that we can reopen it as needed */
|
|
qemu_close(s->fd);
|
|
s->fd = -1;
|
|
s->fd_media_changed = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int floppy_probe_device(const char *filename)
|
|
{
|
|
int fd, ret;
|
|
int prio = 0;
|
|
struct floppy_struct fdparam;
|
|
struct stat st;
|
|
|
|
if (strstart(filename, "/dev/fd", NULL) &&
|
|
!strstart(filename, "/dev/fdset/", NULL)) {
|
|
prio = 50;
|
|
}
|
|
|
|
fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
|
|
if (fd < 0) {
|
|
goto out;
|
|
}
|
|
ret = fstat(fd, &st);
|
|
if (ret == -1 || !S_ISBLK(st.st_mode)) {
|
|
goto outc;
|
|
}
|
|
|
|
/* Attempt to detect via a floppy specific ioctl */
|
|
ret = ioctl(fd, FDGETPRM, &fdparam);
|
|
if (ret >= 0)
|
|
prio = 100;
|
|
|
|
outc:
|
|
qemu_close(fd);
|
|
out:
|
|
return prio;
|
|
}
|
|
|
|
|
|
static int floppy_is_inserted(BlockDriverState *bs)
|
|
{
|
|
return fd_open(bs) >= 0;
|
|
}
|
|
|
|
static int floppy_media_changed(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
/*
|
|
* XXX: we do not have a true media changed indication.
|
|
* It does not work if the floppy is changed without trying to read it.
|
|
*/
|
|
fd_open(bs);
|
|
ret = s->fd_media_changed;
|
|
s->fd_media_changed = 0;
|
|
#ifdef DEBUG_FLOPPY
|
|
printf("Floppy changed=%d\n", ret);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void floppy_eject(BlockDriverState *bs, bool eject_flag)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd;
|
|
|
|
if (s->fd >= 0) {
|
|
qemu_close(s->fd);
|
|
s->fd = -1;
|
|
}
|
|
fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
|
|
if (fd >= 0) {
|
|
if (ioctl(fd, FDEJECT, 0) < 0)
|
|
perror("FDEJECT");
|
|
qemu_close(fd);
|
|
}
|
|
}
|
|
|
|
static BlockDriver bdrv_host_floppy = {
|
|
.format_name = "host_floppy",
|
|
.protocol_name = "host_floppy",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe_device = floppy_probe_device,
|
|
.bdrv_file_open = floppy_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_create = hdev_create,
|
|
.create_options = raw_create_options,
|
|
.bdrv_has_zero_init = hdev_has_zero_init,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* removable device support */
|
|
.bdrv_is_inserted = floppy_is_inserted,
|
|
.bdrv_media_changed = floppy_media_changed,
|
|
.bdrv_eject = floppy_eject,
|
|
};
|
|
|
|
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
s->type = FTYPE_CD;
|
|
|
|
/* open will not fail even if no CD is inserted, so add O_NONBLOCK */
|
|
return raw_open_common(bs, filename, flags, O_NONBLOCK);
|
|
}
|
|
|
|
static int cdrom_probe_device(const char *filename)
|
|
{
|
|
int fd, ret;
|
|
int prio = 0;
|
|
struct stat st;
|
|
|
|
fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
|
|
if (fd < 0) {
|
|
goto out;
|
|
}
|
|
ret = fstat(fd, &st);
|
|
if (ret == -1 || !S_ISBLK(st.st_mode)) {
|
|
goto outc;
|
|
}
|
|
|
|
/* Attempt to detect via a CDROM specific ioctl */
|
|
ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
|
|
if (ret >= 0)
|
|
prio = 100;
|
|
|
|
outc:
|
|
qemu_close(fd);
|
|
out:
|
|
return prio;
|
|
}
|
|
|
|
static int cdrom_is_inserted(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
|
|
if (ret == CDS_DISC_OK)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (eject_flag) {
|
|
if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
|
|
perror("CDROMEJECT");
|
|
} else {
|
|
if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
|
|
perror("CDROMEJECT");
|
|
}
|
|
}
|
|
|
|
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
|
|
/*
|
|
* Note: an error can happen if the distribution automatically
|
|
* mounts the CD-ROM
|
|
*/
|
|
/* perror("CDROM_LOCKDOOR"); */
|
|
}
|
|
}
|
|
|
|
static BlockDriver bdrv_host_cdrom = {
|
|
.format_name = "host_cdrom",
|
|
.protocol_name = "host_cdrom",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe_device = cdrom_probe_device,
|
|
.bdrv_file_open = cdrom_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_create = hdev_create,
|
|
.create_options = raw_create_options,
|
|
.bdrv_has_zero_init = hdev_has_zero_init,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* removable device support */
|
|
.bdrv_is_inserted = cdrom_is_inserted,
|
|
.bdrv_eject = cdrom_eject,
|
|
.bdrv_lock_medium = cdrom_lock_medium,
|
|
|
|
/* generic scsi device */
|
|
.bdrv_ioctl = hdev_ioctl,
|
|
.bdrv_aio_ioctl = hdev_aio_ioctl,
|
|
};
|
|
#endif /* __linux__ */
|
|
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
s->type = FTYPE_CD;
|
|
|
|
ret = raw_open_common(bs, filename, flags, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* make sure the door isn't locked at this time */
|
|
ioctl(s->fd, CDIOCALLOW);
|
|
return 0;
|
|
}
|
|
|
|
static int cdrom_probe_device(const char *filename)
|
|
{
|
|
if (strstart(filename, "/dev/cd", NULL) ||
|
|
strstart(filename, "/dev/acd", NULL))
|
|
return 100;
|
|
return 0;
|
|
}
|
|
|
|
static int cdrom_reopen(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int fd;
|
|
|
|
/*
|
|
* Force reread of possibly changed/newly loaded disc,
|
|
* FreeBSD seems to not notice sometimes...
|
|
*/
|
|
if (s->fd >= 0)
|
|
qemu_close(s->fd);
|
|
fd = qemu_open(bs->filename, s->open_flags, 0644);
|
|
if (fd < 0) {
|
|
s->fd = -1;
|
|
return -EIO;
|
|
}
|
|
s->fd = fd;
|
|
|
|
/* make sure the door isn't locked at this time */
|
|
ioctl(s->fd, CDIOCALLOW);
|
|
return 0;
|
|
}
|
|
|
|
static int cdrom_is_inserted(BlockDriverState *bs)
|
|
{
|
|
return raw_getlength(bs) > 0;
|
|
}
|
|
|
|
static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (s->fd < 0)
|
|
return;
|
|
|
|
(void) ioctl(s->fd, CDIOCALLOW);
|
|
|
|
if (eject_flag) {
|
|
if (ioctl(s->fd, CDIOCEJECT) < 0)
|
|
perror("CDIOCEJECT");
|
|
} else {
|
|
if (ioctl(s->fd, CDIOCCLOSE) < 0)
|
|
perror("CDIOCCLOSE");
|
|
}
|
|
|
|
cdrom_reopen(bs);
|
|
}
|
|
|
|
static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (s->fd < 0)
|
|
return;
|
|
if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
|
|
/*
|
|
* Note: an error can happen if the distribution automatically
|
|
* mounts the CD-ROM
|
|
*/
|
|
/* perror("CDROM_LOCKDOOR"); */
|
|
}
|
|
}
|
|
|
|
static BlockDriver bdrv_host_cdrom = {
|
|
.format_name = "host_cdrom",
|
|
.protocol_name = "host_cdrom",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe_device = cdrom_probe_device,
|
|
.bdrv_file_open = cdrom_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_create = hdev_create,
|
|
.create_options = raw_create_options,
|
|
.bdrv_has_zero_init = hdev_has_zero_init,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
/* removable device support */
|
|
.bdrv_is_inserted = cdrom_is_inserted,
|
|
.bdrv_eject = cdrom_eject,
|
|
.bdrv_lock_medium = cdrom_lock_medium,
|
|
};
|
|
#endif /* __FreeBSD__ */
|
|
|
|
static void bdrv_file_init(void)
|
|
{
|
|
/*
|
|
* Register all the drivers. Note that order is important, the driver
|
|
* registered last will get probed first.
|
|
*/
|
|
bdrv_register(&bdrv_file);
|
|
bdrv_register(&bdrv_host_device);
|
|
#ifdef __linux__
|
|
bdrv_register(&bdrv_host_floppy);
|
|
bdrv_register(&bdrv_host_cdrom);
|
|
#endif
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
bdrv_register(&bdrv_host_cdrom);
|
|
#endif
|
|
}
|
|
|
|
block_init(bdrv_file_init);
|