mirror of https://github.com/proxmox/mirror_qemu
2710 lines
74 KiB
C
2710 lines
74 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/osdep.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "trace.h"
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#include "block/thread-pool.h"
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#include "qemu/iov.h"
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#include "block/raw-aio.h"
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#include "qapi/util.h"
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#include "qapi/qmp/qstring.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 <IOKit/storage/IODVDMedia.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/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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#include <linux/hdreg.h>
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#include <scsi/sg.h>
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#ifdef __s390__
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#include <asm/dasd.h>
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#endif
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#ifndef FS_NOCOW_FL
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#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
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#endif
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#endif
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#if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
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#include <linux/falloc.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_BLOCK
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#ifdef DEBUG_BLOCK
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# define DEBUG_BLOCK_PRINT 1
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#else
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# define DEBUG_BLOCK_PRINT 0
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#endif
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#define DPRINTF(fmt, ...) \
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do { \
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if (DEBUG_BLOCK_PRINT) { \
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printf(fmt, ## __VA_ARGS__); \
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} \
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} while (0)
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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 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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size_t buf_align;
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#ifdef CONFIG_XFS
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bool is_xfs:1;
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#endif
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bool has_discard:1;
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bool has_write_zeroes:1;
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bool discard_zeroes:1;
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bool use_linux_aio:1;
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bool page_cache_inconsistent:1;
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bool has_fallocate;
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bool needs_alignment;
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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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} 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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uint64_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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/*
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* Get logical block size via ioctl. On success store it in @sector_size_p.
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*/
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static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
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{
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unsigned int sector_size;
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bool success = false;
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int i;
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errno = ENOTSUP;
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static const unsigned long ioctl_list[] = {
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#ifdef BLKSSZGET
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BLKSSZGET,
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#endif
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#ifdef DKIOCGETBLOCKSIZE
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DKIOCGETBLOCKSIZE,
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#endif
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#ifdef DIOCGSECTORSIZE
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DIOCGSECTORSIZE,
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#endif
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};
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/* Try a few ioctls to get the right size */
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for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) {
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if (ioctl(fd, ioctl_list[i], §or_size) >= 0) {
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*sector_size_p = sector_size;
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success = true;
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}
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}
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return success ? 0 : -errno;
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}
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/**
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* Get physical block size of @fd.
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* On success, store it in @blk_size and return 0.
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* On failure, return -errno.
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*/
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static int probe_physical_blocksize(int fd, unsigned int *blk_size)
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{
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#ifdef BLKPBSZGET
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if (ioctl(fd, BLKPBSZGET, blk_size) < 0) {
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return -errno;
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}
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return 0;
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#else
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return -ENOTSUP;
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#endif
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}
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/* Check if read is allowed with given memory buffer and length.
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*
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* This function is used to check O_DIRECT memory buffer and request alignment.
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*/
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static bool raw_is_io_aligned(int fd, void *buf, size_t len)
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{
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ssize_t ret = pread(fd, buf, len, 0);
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if (ret >= 0) {
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return true;
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}
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#ifdef __linux__
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/* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
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* other errors (e.g. real I/O error), which could happen on a failed
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* drive, since we only care about probing alignment.
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*/
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if (errno != EINVAL) {
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return true;
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}
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#endif
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return false;
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}
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static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
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{
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BDRVRawState *s = bs->opaque;
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char *buf;
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size_t max_align = MAX(MAX_BLOCKSIZE, getpagesize());
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/* For SCSI generic devices the alignment is not really used.
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With buffered I/O, we don't have any restrictions. */
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if (bdrv_is_sg(bs) || !s->needs_alignment) {
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bs->bl.request_alignment = 1;
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s->buf_align = 1;
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return;
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}
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bs->bl.request_alignment = 0;
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s->buf_align = 0;
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/* Let's try to use the logical blocksize for the alignment. */
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if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) {
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bs->bl.request_alignment = 0;
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}
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#ifdef CONFIG_XFS
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if (s->is_xfs) {
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struct dioattr da;
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if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
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bs->bl.request_alignment = da.d_miniosz;
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/* The kernel returns wrong information for d_mem */
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/* s->buf_align = da.d_mem; */
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}
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}
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#endif
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/* If we could not get the sizes so far, we can only guess them */
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if (!s->buf_align) {
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size_t align;
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buf = qemu_memalign(max_align, 2 * max_align);
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for (align = 512; align <= max_align; align <<= 1) {
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if (raw_is_io_aligned(fd, buf + align, max_align)) {
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s->buf_align = align;
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break;
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}
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}
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qemu_vfree(buf);
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}
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|
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if (!bs->bl.request_alignment) {
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size_t align;
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buf = qemu_memalign(s->buf_align, max_align);
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for (align = 512; align <= max_align; align <<= 1) {
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if (raw_is_io_aligned(fd, buf, align)) {
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bs->bl.request_alignment = align;
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break;
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}
|
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}
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qemu_vfree(buf);
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}
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if (!s->buf_align || !bs->bl.request_alignment) {
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error_setg(errp, "Could not find working O_DIRECT alignment");
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error_append_hint(errp, "Try cache.direct=off\n");
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}
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}
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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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|
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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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|
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static void raw_parse_filename(const char *filename, QDict *options,
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Error **errp)
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{
|
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/* The filename does not have to be prefixed by the protocol name, since
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* "file" is the default protocol; therefore, the return value of this
|
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* function call can be ignored. */
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strstart(filename, "file:", &filename);
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|
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qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
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}
|
|
|
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static QemuOptsList raw_runtime_opts = {
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.name = "raw",
|
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.head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
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.desc = {
|
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{
|
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.name = "filename",
|
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.type = QEMU_OPT_STRING,
|
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.help = "File name of the image",
|
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},
|
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{
|
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.name = "aio",
|
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.type = QEMU_OPT_STRING,
|
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.help = "host AIO implementation (threads, native)",
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},
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{ /* end of list */ }
|
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},
|
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};
|
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|
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static int raw_open_common(BlockDriverState *bs, QDict *options,
|
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int bdrv_flags, int open_flags, Error **errp)
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{
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BDRVRawState *s = bs->opaque;
|
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QemuOpts *opts;
|
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Error *local_err = NULL;
|
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const char *filename = NULL;
|
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BlockdevAioOptions aio, aio_default;
|
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int fd, ret;
|
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struct stat st;
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|
|
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opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
|
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qemu_opts_absorb_qdict(opts, options, &local_err);
|
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if (local_err) {
|
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error_propagate(errp, local_err);
|
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ret = -EINVAL;
|
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goto fail;
|
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}
|
|
|
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filename = qemu_opt_get(opts, "filename");
|
|
|
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ret = raw_normalize_devicepath(&filename);
|
|
if (ret != 0) {
|
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error_setg_errno(errp, -ret, "Could not normalize device path");
|
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goto fail;
|
|
}
|
|
|
|
aio_default = (bdrv_flags & BDRV_O_NATIVE_AIO)
|
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? BLOCKDEV_AIO_OPTIONS_NATIVE
|
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: BLOCKDEV_AIO_OPTIONS_THREADS;
|
|
aio = qapi_enum_parse(BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
|
|
BLOCKDEV_AIO_OPTIONS__MAX, aio_default, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE);
|
|
|
|
s->open_flags = open_flags;
|
|
raw_parse_flags(bdrv_flags, &s->open_flags);
|
|
|
|
s->fd = -1;
|
|
fd = qemu_open(filename, s->open_flags, 0644);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, errno, "Could not open '%s'", filename);
|
|
if (ret == -EROFS) {
|
|
ret = -EACCES;
|
|
}
|
|
goto fail;
|
|
}
|
|
s->fd = fd;
|
|
|
|
#ifdef CONFIG_LINUX_AIO
|
|
/* Currently Linux does AIO only for files opened with O_DIRECT */
|
|
if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) {
|
|
error_setg(errp, "aio=native was specified, but it requires "
|
|
"cache.direct=on, which was not specified.");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
#else
|
|
if (s->use_linux_aio) {
|
|
error_setg(errp, "aio=native was specified, but is not supported "
|
|
"in this build.");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
#endif /* !defined(CONFIG_LINUX_AIO) */
|
|
|
|
s->has_discard = true;
|
|
s->has_write_zeroes = true;
|
|
bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
|
|
if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
|
|
s->needs_alignment = true;
|
|
}
|
|
|
|
if (fstat(s->fd, &st) < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, errno, "Could not stat file");
|
|
goto fail;
|
|
}
|
|
if (S_ISREG(st.st_mode)) {
|
|
s->discard_zeroes = true;
|
|
s->has_fallocate = true;
|
|
}
|
|
if (S_ISBLK(st.st_mode)) {
|
|
#ifdef BLKDISCARDZEROES
|
|
unsigned int arg;
|
|
if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
|
|
s->discard_zeroes = true;
|
|
}
|
|
#endif
|
|
#ifdef __linux__
|
|
/* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
|
|
* not rely on the contents of discarded blocks unless using O_DIRECT.
|
|
* Same for BLKZEROOUT.
|
|
*/
|
|
if (!(bs->open_flags & BDRV_O_NOCACHE)) {
|
|
s->discard_zeroes = false;
|
|
s->has_write_zeroes = false;
|
|
}
|
|
#endif
|
|
}
|
|
#ifdef __FreeBSD__
|
|
if (S_ISCHR(st.st_mode)) {
|
|
/*
|
|
* The file is a char device (disk), which on FreeBSD isn't behind
|
|
* a pager, so force all requests to be aligned. This is needed
|
|
* so QEMU makes sure all IO operations on the device are aligned
|
|
* to sector size, or else FreeBSD will reject them with EINVAL.
|
|
*/
|
|
s->needs_alignment = true;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_XFS
|
|
if (platform_test_xfs_fd(s->fd)) {
|
|
s->is_xfs = true;
|
|
}
|
|
#endif
|
|
|
|
ret = 0;
|
|
fail:
|
|
if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
|
|
unlink(filename);
|
|
}
|
|
qemu_opts_del(opts);
|
|
return ret;
|
|
}
|
|
|
|
static int raw_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
s->type = FTYPE_FILE;
|
|
return raw_open_common(bs, options, flags, 0, errp);
|
|
}
|
|
|
|
static int raw_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
BDRVRawState *s;
|
|
BDRVRawReopenState *rs;
|
|
int ret = 0;
|
|
Error *local_err = NULL;
|
|
|
|
assert(state != NULL);
|
|
assert(state->bs != NULL);
|
|
|
|
s = state->bs->opaque;
|
|
|
|
state->opaque = g_new0(BDRVRawReopenState, 1);
|
|
rs = state->opaque;
|
|
|
|
if (s->type == FTYPE_CD) {
|
|
rs->open_flags |= O_NONBLOCK;
|
|
}
|
|
|
|
raw_parse_flags(state->flags, &rs->open_flags);
|
|
|
|
rs->fd = -1;
|
|
|
|
int fcntl_flags = O_APPEND | O_NONBLOCK;
|
|
#ifdef O_NOATIME
|
|
fcntl_flags |= O_NOATIME;
|
|
#endif
|
|
|
|
#ifdef O_ASYNC
|
|
/* Not all operating systems have O_ASYNC, and those that don't
|
|
* will not let us track the state into rs->open_flags (typically
|
|
* you achieve the same effect with an ioctl, for example I_SETSIG
|
|
* on Solaris). But we do not use O_ASYNC, so that's fine.
|
|
*/
|
|
assert((s->open_flags & O_ASYNC) == 0);
|
|
#endif
|
|
|
|
if ((rs->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) {
|
|
/* dup the original fd */
|
|
rs->fd = qemu_dup(s->fd);
|
|
if (rs->fd >= 0) {
|
|
ret = fcntl_setfl(rs->fd, rs->open_flags);
|
|
if (ret) {
|
|
qemu_close(rs->fd);
|
|
rs->fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
|
|
if (rs->fd == -1) {
|
|
const char *normalized_filename = state->bs->filename;
|
|
ret = raw_normalize_devicepath(&normalized_filename);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Could not normalize device path");
|
|
} else {
|
|
assert(!(rs->open_flags & O_CREAT));
|
|
rs->fd = qemu_open(normalized_filename, rs->open_flags);
|
|
if (rs->fd == -1) {
|
|
error_setg_errno(errp, errno, "Could not reopen file");
|
|
ret = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fail already reopen_prepare() if we can't get a working O_DIRECT
|
|
* alignment with the new fd. */
|
|
if (rs->fd != -1) {
|
|
raw_probe_alignment(state->bs, rs->fd, &local_err);
|
|
if (local_err) {
|
|
qemu_close(rs->fd);
|
|
rs->fd = -1;
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void raw_reopen_commit(BDRVReopenState *state)
|
|
{
|
|
BDRVRawReopenState *rs = state->opaque;
|
|
BDRVRawState *s = state->bs->opaque;
|
|
|
|
s->open_flags = rs->open_flags;
|
|
|
|
qemu_close(s->fd);
|
|
s->fd = rs->fd;
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
}
|
|
|
|
|
|
static void raw_reopen_abort(BDRVReopenState *state)
|
|
{
|
|
BDRVRawReopenState *rs = state->opaque;
|
|
|
|
/* nothing to do if NULL, we didn't get far enough */
|
|
if (rs == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (rs->fd >= 0) {
|
|
qemu_close(rs->fd);
|
|
rs->fd = -1;
|
|
}
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
}
|
|
|
|
static int hdev_get_max_transfer_length(BlockDriverState *bs, int fd)
|
|
{
|
|
#ifdef BLKSECTGET
|
|
int max_bytes = 0;
|
|
short max_sectors = 0;
|
|
if (bs->sg && ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
|
|
return max_bytes;
|
|
} else if (!bs->sg && ioctl(fd, BLKSECTGET, &max_sectors) == 0) {
|
|
return max_sectors << BDRV_SECTOR_BITS;
|
|
} else {
|
|
return -errno;
|
|
}
|
|
#else
|
|
return -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
static int hdev_get_max_segments(const struct stat *st)
|
|
{
|
|
#ifdef CONFIG_LINUX
|
|
char buf[32];
|
|
const char *end;
|
|
char *sysfspath;
|
|
int ret;
|
|
int fd = -1;
|
|
long max_segments;
|
|
|
|
sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
|
|
major(st->st_rdev), minor(st->st_rdev));
|
|
fd = open(sysfspath, O_RDONLY);
|
|
if (fd == -1) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
do {
|
|
ret = read(fd, buf, sizeof(buf) - 1);
|
|
} while (ret == -1 && errno == EINTR);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto out;
|
|
} else if (ret == 0) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
buf[ret] = 0;
|
|
/* The file is ended with '\n', pass 'end' to accept that. */
|
|
ret = qemu_strtol(buf, &end, 10, &max_segments);
|
|
if (ret == 0 && end && *end == '\n') {
|
|
ret = max_segments;
|
|
}
|
|
|
|
out:
|
|
if (fd != -1) {
|
|
close(fd);
|
|
}
|
|
g_free(sysfspath);
|
|
return ret;
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
|
|
if (!fstat(s->fd, &st)) {
|
|
if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) {
|
|
int ret = hdev_get_max_transfer_length(bs, s->fd);
|
|
if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
|
|
bs->bl.max_transfer = pow2floor(ret);
|
|
}
|
|
ret = hdev_get_max_segments(&st);
|
|
if (ret > 0) {
|
|
bs->bl.max_transfer = MIN(bs->bl.max_transfer,
|
|
ret * getpagesize());
|
|
}
|
|
}
|
|
}
|
|
|
|
raw_probe_alignment(bs, s->fd, errp);
|
|
bs->bl.min_mem_alignment = s->buf_align;
|
|
bs->bl.opt_mem_alignment = MAX(s->buf_align, getpagesize());
|
|
}
|
|
|
|
static int check_for_dasd(int fd)
|
|
{
|
|
#ifdef BIODASDINFO2
|
|
struct dasd_information2_t info = {0};
|
|
|
|
return ioctl(fd, BIODASDINFO2, &info);
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Try to get @bs's logical and physical block size.
|
|
* On success, store them in @bsz and return zero.
|
|
* On failure, return negative errno.
|
|
*/
|
|
static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
/* If DASD, get blocksizes */
|
|
if (check_for_dasd(s->fd) < 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
ret = probe_logical_blocksize(s->fd, &bsz->log);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return probe_physical_blocksize(s->fd, &bsz->phys);
|
|
}
|
|
|
|
/**
|
|
* Try to get @bs's geometry: cyls, heads, sectors.
|
|
* On success, store them in @geo and return 0.
|
|
* On failure return -errno.
|
|
* (Allows block driver to assign default geometry values that guest sees)
|
|
*/
|
|
#ifdef __linux__
|
|
static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
struct hd_geometry ioctl_geo = {0};
|
|
|
|
/* If DASD, get its geometry */
|
|
if (check_for_dasd(s->fd) < 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) {
|
|
return -errno;
|
|
}
|
|
/* HDIO_GETGEO may return success even though geo contains zeros
|
|
(e.g. certain multipath setups) */
|
|
if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) {
|
|
return -ENOTSUP;
|
|
}
|
|
/* Do not return a geometry for partition */
|
|
if (ioctl_geo.start != 0) {
|
|
return -ENOTSUP;
|
|
}
|
|
geo->heads = ioctl_geo.heads;
|
|
geo->sectors = ioctl_geo.sectors;
|
|
geo->cylinders = ioctl_geo.cylinders;
|
|
|
|
return 0;
|
|
}
|
|
#else /* __linux__ */
|
|
static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
|
|
{
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb)
|
|
{
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
int ret;
|
|
|
|
if (s->page_cache_inconsistent) {
|
|
return -EIO;
|
|
}
|
|
|
|
ret = qemu_fdatasync(aiocb->aio_fildes);
|
|
if (ret == -1) {
|
|
/* There is no clear definition of the semantics of a failing fsync(),
|
|
* so we may have to assume the worst. The sad truth is that this
|
|
* assumption is correct for Linux. Some pages are now probably marked
|
|
* clean in the page cache even though they are inconsistent with the
|
|
* on-disk contents. The next fdatasync() call would succeed, but no
|
|
* further writeback attempt will be made. We can't get back to a state
|
|
* in which we know what is on disk (we would have to rewrite
|
|
* everything that was touched since the last fdatasync() at least), so
|
|
* make bdrv_flush() fail permanently. Given that the behaviour isn't
|
|
* really defined, I have little hope that other OSes are doing better.
|
|
*
|
|
* Obviously, this doesn't affect O_DIRECT, which bypasses the page
|
|
* cache. */
|
|
if ((s->open_flags & O_DIRECT) == 0) {
|
|
s->page_cache_inconsistent = true;
|
|
}
|
|
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 && errno == EINVAL &&
|
|
(aiocb->bs->open_flags & BDRV_O_NOCACHE) &&
|
|
!(aiocb->aio_type & QEMU_AIO_WRITE) &&
|
|
offset > 0) {
|
|
/* O_DIRECT pread() may fail with EINVAL when offset is unaligned
|
|
* after a short read. Assume that O_DIRECT short reads only occur
|
|
* at EOF. Therefore this is a short read, not an I/O error.
|
|
*/
|
|
break;
|
|
} 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_try_blockalign(aiocb->bs, aiocb->aio_nbytes);
|
|
if (buf == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
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;
|
|
}
|
|
assert(p - buf == aiocb->aio_nbytes);
|
|
}
|
|
|
|
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);
|
|
assert(count >= copy);
|
|
p += copy;
|
|
count -= copy;
|
|
}
|
|
assert(count == 0);
|
|
}
|
|
qemu_vfree(buf);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
#ifdef CONFIG_XFS
|
|
static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
|
|
{
|
|
struct xfs_flock64 fl;
|
|
int err;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.l_whence = SEEK_SET;
|
|
fl.l_start = offset;
|
|
fl.l_len = bytes;
|
|
|
|
if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
|
|
err = errno;
|
|
DPRINTF("cannot write zero range (%s)\n", strerror(errno));
|
|
return -err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
|
|
{
|
|
struct xfs_flock64 fl;
|
|
int err;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.l_whence = SEEK_SET;
|
|
fl.l_start = offset;
|
|
fl.l_len = bytes;
|
|
|
|
if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
|
|
err = errno;
|
|
DPRINTF("cannot punch hole (%s)\n", strerror(errno));
|
|
return -err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int translate_err(int err)
|
|
{
|
|
if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP ||
|
|
err == -ENOTTY) {
|
|
err = -ENOTSUP;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_FALLOCATE
|
|
static int do_fallocate(int fd, int mode, off_t offset, off_t len)
|
|
{
|
|
do {
|
|
if (fallocate(fd, mode, offset, len) == 0) {
|
|
return 0;
|
|
}
|
|
} while (errno == EINTR);
|
|
return translate_err(-errno);
|
|
}
|
|
#endif
|
|
|
|
static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb)
|
|
{
|
|
int ret = -ENOTSUP;
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
|
|
if (!s->has_write_zeroes) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
#ifdef BLKZEROOUT
|
|
do {
|
|
uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
|
|
if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) {
|
|
return 0;
|
|
}
|
|
} while (errno == EINTR);
|
|
|
|
ret = translate_err(-errno);
|
|
#endif
|
|
|
|
if (ret == -ENOTSUP) {
|
|
s->has_write_zeroes = false;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
|
|
{
|
|
#if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
#endif
|
|
|
|
if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
|
|
return handle_aiocb_write_zeroes_block(aiocb);
|
|
}
|
|
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE_ZERO_RANGE
|
|
if (s->has_write_zeroes) {
|
|
int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_write_zeroes = false;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
|
|
if (s->has_discard && s->has_fallocate) {
|
|
int ret = do_fallocate(s->fd,
|
|
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0) {
|
|
ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_fallocate = false;
|
|
} else if (ret != -ENOTSUP) {
|
|
return ret;
|
|
} else {
|
|
s->has_discard = false;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE
|
|
if (s->has_fallocate && aiocb->aio_offset >= bdrv_getlength(aiocb->bs)) {
|
|
int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
if (ret == 0 || ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
s->has_fallocate = false;
|
|
}
|
|
#endif
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
|
|
{
|
|
int ret = -EOPNOTSUPP;
|
|
BDRVRawState *s = aiocb->bs->opaque;
|
|
|
|
if (!s->has_discard) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
|
|
#ifdef BLKDISCARD
|
|
do {
|
|
uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes };
|
|
if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) {
|
|
return 0;
|
|
}
|
|
} while (errno == EINTR);
|
|
|
|
ret = -errno;
|
|
#endif
|
|
} else {
|
|
#ifdef CONFIG_XFS
|
|
if (s->is_xfs) {
|
|
return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
|
|
ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
|
|
aiocb->aio_offset, aiocb->aio_nbytes);
|
|
#endif
|
|
}
|
|
|
|
ret = translate_err(ret);
|
|
if (ret == -ENOTSUP) {
|
|
s->has_discard = false;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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) {
|
|
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;
|
|
case QEMU_AIO_DISCARD:
|
|
ret = handle_aiocb_discard(aiocb);
|
|
break;
|
|
case QEMU_AIO_WRITE_ZEROES:
|
|
ret = handle_aiocb_write_zeroes(aiocb);
|
|
break;
|
|
default:
|
|
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
g_free(aiocb);
|
|
return ret;
|
|
}
|
|
|
|
static int paio_submit_co(BlockDriverState *bs, int fd,
|
|
int64_t offset, QEMUIOVector *qiov,
|
|
int count, int type)
|
|
{
|
|
RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
|
|
ThreadPool *pool;
|
|
|
|
acb->bs = bs;
|
|
acb->aio_type = type;
|
|
acb->aio_fildes = fd;
|
|
|
|
acb->aio_nbytes = count;
|
|
acb->aio_offset = offset;
|
|
|
|
if (qiov) {
|
|
acb->aio_iov = qiov->iov;
|
|
acb->aio_niov = qiov->niov;
|
|
assert(qiov->size == count);
|
|
}
|
|
|
|
trace_paio_submit_co(offset, count, type);
|
|
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
|
|
return thread_pool_submit_co(pool, aio_worker, acb);
|
|
}
|
|
|
|
static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd,
|
|
int64_t offset, QEMUIOVector *qiov, int count,
|
|
BlockCompletionFunc *cb, void *opaque, int type)
|
|
{
|
|
RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
|
|
ThreadPool *pool;
|
|
|
|
acb->bs = bs;
|
|
acb->aio_type = type;
|
|
acb->aio_fildes = fd;
|
|
|
|
acb->aio_nbytes = count;
|
|
acb->aio_offset = offset;
|
|
|
|
if (qiov) {
|
|
acb->aio_iov = qiov->iov;
|
|
acb->aio_niov = qiov->niov;
|
|
assert(qiov->size == acb->aio_nbytes);
|
|
}
|
|
|
|
trace_paio_submit(acb, opaque, offset, count, type);
|
|
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
|
|
return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int type)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return -EIO;
|
|
|
|
/*
|
|
* Check if the underlying device requires requests to be aligned,
|
|
* and if the request we are trying to submit is aligned or not.
|
|
* If this is the case tell the low-level driver that it needs
|
|
* to copy the buffer.
|
|
*/
|
|
if (s->needs_alignment) {
|
|
if (!bdrv_qiov_is_aligned(bs, qiov)) {
|
|
type |= QEMU_AIO_MISALIGNED;
|
|
#ifdef CONFIG_LINUX_AIO
|
|
} else if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
assert(qiov->size == bytes);
|
|
return laio_co_submit(bs, aio, s->fd, offset, qiov, type);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return paio_submit_co(bs, s->fd, offset, qiov, bytes, type);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov,
|
|
int flags)
|
|
{
|
|
return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov,
|
|
int flags)
|
|
{
|
|
assert(flags == 0);
|
|
return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE);
|
|
}
|
|
|
|
static void raw_aio_plug(BlockDriverState *bs)
|
|
{
|
|
#ifdef CONFIG_LINUX_AIO
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
laio_io_plug(bs, aio);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void raw_aio_unplug(BlockDriverState *bs)
|
|
{
|
|
#ifdef CONFIG_LINUX_AIO
|
|
BDRVRawState *s = bs->opaque;
|
|
if (s->use_linux_aio) {
|
|
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
|
|
laio_io_unplug(bs, aio);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
|
|
BlockCompletionFunc *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 -errno;
|
|
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
|
|
struct disklabel dl;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl))
|
|
return -errno;
|
|
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 -errno;
|
|
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 -errno;
|
|
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;
|
|
int64_t size;
|
|
|
|
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.
|
|
*/
|
|
size = lseek(s->fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
return size;
|
|
}
|
|
#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__)
|
|
{
|
|
uint64_t sectors = 0;
|
|
uint32_t sector_size = 0;
|
|
|
|
if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0
|
|
&& ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) {
|
|
size = sectors * sector_size;
|
|
} else {
|
|
size = lseek(fd, 0LL, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
size = lseek(fd, 0LL, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
#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);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
#else
|
|
static int64_t raw_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
int64_t size;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
size = lseek(s->fd, 0, SEEK_END);
|
|
if (size < 0) {
|
|
return -errno;
|
|
}
|
|
return size;
|
|
}
|
|
#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, QemuOpts *opts, Error **errp)
|
|
{
|
|
int fd;
|
|
int result = 0;
|
|
int64_t total_size = 0;
|
|
bool nocow = false;
|
|
PreallocMode prealloc;
|
|
char *buf = NULL;
|
|
Error *local_err = NULL;
|
|
|
|
strstart(filename, "file:", &filename);
|
|
|
|
/* Read out options */
|
|
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false);
|
|
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
|
|
prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
|
|
PREALLOC_MODE__MAX, PREALLOC_MODE_OFF,
|
|
&local_err);
|
|
g_free(buf);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
result = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
fd = qemu_open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
|
|
0644);
|
|
if (fd < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not create file");
|
|
goto out;
|
|
}
|
|
|
|
if (nocow) {
|
|
#ifdef __linux__
|
|
/* Set NOCOW flag to solve performance issue on fs like btrfs.
|
|
* This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
|
|
* will be ignored since any failure of this operation should not
|
|
* block the left work.
|
|
*/
|
|
int attr;
|
|
if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) {
|
|
attr |= FS_NOCOW_FL;
|
|
ioctl(fd, FS_IOC_SETFLAGS, &attr);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
switch (prealloc) {
|
|
#ifdef CONFIG_POSIX_FALLOCATE
|
|
case PREALLOC_MODE_FALLOC:
|
|
/*
|
|
* Truncating before posix_fallocate() makes it about twice slower on
|
|
* file systems that do not support fallocate(), trying to check if a
|
|
* block is allocated before allocating it, so don't do that here.
|
|
*/
|
|
result = -posix_fallocate(fd, 0, total_size);
|
|
if (result != 0) {
|
|
/* posix_fallocate() doesn't set errno. */
|
|
error_setg_errno(errp, -result,
|
|
"Could not preallocate data for the new file");
|
|
}
|
|
break;
|
|
#endif
|
|
case PREALLOC_MODE_FULL:
|
|
{
|
|
/*
|
|
* Knowing the final size from the beginning could allow the file
|
|
* system driver to do less allocations and possibly avoid
|
|
* fragmentation of the file.
|
|
*/
|
|
if (ftruncate(fd, total_size) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not resize file");
|
|
goto out_close;
|
|
}
|
|
|
|
int64_t num = 0, left = total_size;
|
|
buf = g_malloc0(65536);
|
|
|
|
while (left > 0) {
|
|
num = MIN(left, 65536);
|
|
result = write(fd, buf, num);
|
|
if (result < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result,
|
|
"Could not write to the new file");
|
|
break;
|
|
}
|
|
left -= result;
|
|
}
|
|
if (result >= 0) {
|
|
result = fsync(fd);
|
|
if (result < 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result,
|
|
"Could not flush new file to disk");
|
|
}
|
|
}
|
|
g_free(buf);
|
|
break;
|
|
}
|
|
case PREALLOC_MODE_OFF:
|
|
if (ftruncate(fd, total_size) != 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not resize file");
|
|
}
|
|
break;
|
|
default:
|
|
result = -EINVAL;
|
|
error_setg(errp, "Unsupported preallocation mode: %s",
|
|
PreallocMode_lookup[prealloc]);
|
|
break;
|
|
}
|
|
|
|
out_close:
|
|
if (qemu_close(fd) != 0 && result == 0) {
|
|
result = -errno;
|
|
error_setg_errno(errp, -result, "Could not close the new file");
|
|
}
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find allocation range in @bs around offset @start.
|
|
* May change underlying file descriptor's file offset.
|
|
* If @start is not in a hole, store @start in @data, and the
|
|
* beginning of the next hole in @hole, and return 0.
|
|
* If @start is in a non-trailing hole, store @start in @hole and the
|
|
* beginning of the next non-hole in @data, and return 0.
|
|
* If @start is in a trailing hole or beyond EOF, return -ENXIO.
|
|
* If we can't find out, return a negative errno other than -ENXIO.
|
|
*/
|
|
static int find_allocation(BlockDriverState *bs, off_t start,
|
|
off_t *data, off_t *hole)
|
|
{
|
|
#if defined SEEK_HOLE && defined SEEK_DATA
|
|
BDRVRawState *s = bs->opaque;
|
|
off_t offs;
|
|
|
|
/*
|
|
* SEEK_DATA cases:
|
|
* D1. offs == start: start is in data
|
|
* D2. offs > start: start is in a hole, next data at offs
|
|
* D3. offs < 0, errno = ENXIO: either start is in a trailing hole
|
|
* or start is beyond EOF
|
|
* If the latter happens, the file has been truncated behind
|
|
* our back since we opened it. All bets are off then.
|
|
* Treating like a trailing hole is simplest.
|
|
* D4. offs < 0, errno != ENXIO: we learned nothing
|
|
*/
|
|
offs = lseek(s->fd, start, SEEK_DATA);
|
|
if (offs < 0) {
|
|
return -errno; /* D3 or D4 */
|
|
}
|
|
assert(offs >= start);
|
|
|
|
if (offs > start) {
|
|
/* D2: in hole, next data at offs */
|
|
*hole = start;
|
|
*data = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1: in data, end not yet known */
|
|
|
|
/*
|
|
* SEEK_HOLE cases:
|
|
* H1. offs == start: start is in a hole
|
|
* If this happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H2. offs > start: either start is in data, next hole at offs,
|
|
* or start is in trailing hole, EOF at offs
|
|
* Linux treats trailing holes like any other hole: offs ==
|
|
* start. Solaris seeks to EOF instead: offs > start (blech).
|
|
* If that happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H3. offs < 0, errno = ENXIO: start is beyond EOF
|
|
* If this happens, the file has been truncated behind our
|
|
* back since we opened it. Treat it like a trailing hole.
|
|
* H4. offs < 0, errno != ENXIO: we learned nothing
|
|
* Pretend we know nothing at all, i.e. "forget" about D1.
|
|
*/
|
|
offs = lseek(s->fd, start, SEEK_HOLE);
|
|
if (offs < 0) {
|
|
return -errno; /* D1 and (H3 or H4) */
|
|
}
|
|
assert(offs >= start);
|
|
|
|
if (offs > start) {
|
|
/*
|
|
* D1 and H2: either in data, next hole at offs, or it was in
|
|
* data but is now in a trailing hole. In the latter case,
|
|
* all bets are off. Treating it as if it there was data all
|
|
* the way to EOF is safe, so simply do that.
|
|
*/
|
|
*data = start;
|
|
*hole = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1 and H1 */
|
|
return -EBUSY;
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Returns the allocation status of the specified sectors.
|
|
*
|
|
* 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 int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors, int *pnum,
|
|
BlockDriverState **file)
|
|
{
|
|
off_t start, data = 0, hole = 0;
|
|
int64_t total_size;
|
|
int ret;
|
|
|
|
ret = fd_open(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
start = sector_num * BDRV_SECTOR_SIZE;
|
|
total_size = bdrv_getlength(bs);
|
|
if (total_size < 0) {
|
|
return total_size;
|
|
} else if (start >= total_size) {
|
|
*pnum = 0;
|
|
return 0;
|
|
} else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
|
|
nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
ret = find_allocation(bs, start, &data, &hole);
|
|
if (ret == -ENXIO) {
|
|
/* Trailing hole */
|
|
*pnum = nb_sectors;
|
|
ret = BDRV_BLOCK_ZERO;
|
|
} else if (ret < 0) {
|
|
/* No info available, so pretend there are no holes */
|
|
*pnum = nb_sectors;
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else if (data == start) {
|
|
/* On a data extent, compute sectors to the end of the extent,
|
|
* possibly including a partial sector at EOF. */
|
|
*pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else {
|
|
/* On a hole, compute sectors to the beginning of the next extent. */
|
|
assert(hole == start);
|
|
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
|
|
ret = BDRV_BLOCK_ZERO;
|
|
}
|
|
*file = bs;
|
|
return ret | BDRV_BLOCK_OFFSET_VALID | start;
|
|
}
|
|
|
|
static coroutine_fn BlockAIOCB *raw_aio_pdiscard(BlockDriverState *bs,
|
|
int64_t offset, int count,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
return paio_submit(bs, s->fd, offset, NULL, count,
|
|
cb, opaque, QEMU_AIO_DISCARD);
|
|
}
|
|
|
|
static int coroutine_fn raw_co_pwrite_zeroes(
|
|
BlockDriverState *bs, int64_t offset,
|
|
int count, BdrvRequestFlags flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (!(flags & BDRV_REQ_MAY_UNMAP)) {
|
|
return paio_submit_co(bs, s->fd, offset, NULL, count,
|
|
QEMU_AIO_WRITE_ZEROES);
|
|
} else if (s->discard_zeroes) {
|
|
return paio_submit_co(bs, s->fd, offset, NULL, count,
|
|
QEMU_AIO_DISCARD);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
bdi->unallocated_blocks_are_zero = s->discard_zeroes;
|
|
bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
|
|
return 0;
|
|
}
|
|
|
|
static QemuOptsList raw_create_opts = {
|
|
.name = "raw-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_NOCOW,
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "Turn off copy-on-write (valid only on btrfs)"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_PREALLOC,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Preallocation mode (allowed values: off, falloc, full)"
|
|
},
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
BlockDriver bdrv_file = {
|
|
.format_name = "file",
|
|
.protocol_name = "file",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_needs_filename = true,
|
|
.bdrv_probe = NULL, /* no probe for protocols */
|
|
.bdrv_parse_filename = raw_parse_filename,
|
|
.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_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_co_get_block_status = raw_co_get_block_status,
|
|
.bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
.bdrv_aio_pdiscard = raw_aio_pdiscard,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_info = raw_get_info,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
|
|
.create_opts = &raw_create_opts,
|
|
};
|
|
|
|
/***********************************************/
|
|
/* host device */
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
|
|
CFIndex maxPathSize, int flags);
|
|
static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
|
|
{
|
|
kern_return_t kernResult = KERN_FAILURE;
|
|
mach_port_t masterPort;
|
|
CFMutableDictionaryRef classesToMatch;
|
|
const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass};
|
|
char *mediaType = NULL;
|
|
|
|
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
|
|
if ( KERN_SUCCESS != kernResult ) {
|
|
printf( "IOMasterPort returned %d\n", kernResult );
|
|
}
|
|
|
|
int index;
|
|
for (index = 0; index < ARRAY_SIZE(matching_array); index++) {
|
|
classesToMatch = IOServiceMatching(matching_array[index]);
|
|
if (classesToMatch == NULL) {
|
|
error_report("IOServiceMatching returned NULL for %s",
|
|
matching_array[index]);
|
|
continue;
|
|
}
|
|
CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey),
|
|
kCFBooleanTrue);
|
|
kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch,
|
|
mediaIterator);
|
|
if (kernResult != KERN_SUCCESS) {
|
|
error_report("Note: IOServiceGetMatchingServices returned %d",
|
|
kernResult);
|
|
continue;
|
|
}
|
|
|
|
/* If a match was found, leave the loop */
|
|
if (*mediaIterator != 0) {
|
|
DPRINTF("Matching using %s\n", matching_array[index]);
|
|
mediaType = g_strdup(matching_array[index]);
|
|
break;
|
|
}
|
|
}
|
|
return mediaType;
|
|
}
|
|
|
|
kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
|
|
CFIndex maxPathSize, int flags)
|
|
{
|
|
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 );
|
|
if (flags & BDRV_O_NOCACHE) {
|
|
strcat(bsdPath, "r");
|
|
}
|
|
devPathLength = strlen( bsdPath );
|
|
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
|
|
kernResult = KERN_SUCCESS;
|
|
}
|
|
CFRelease( bsdPathAsCFString );
|
|
}
|
|
IOObjectRelease( nextMedia );
|
|
}
|
|
|
|
return kernResult;
|
|
}
|
|
|
|
/* Sets up a real cdrom for use in QEMU */
|
|
static bool setup_cdrom(char *bsd_path, Error **errp)
|
|
{
|
|
int index, num_of_test_partitions = 2, fd;
|
|
char test_partition[MAXPATHLEN];
|
|
bool partition_found = false;
|
|
|
|
/* look for a working partition */
|
|
for (index = 0; index < num_of_test_partitions; index++) {
|
|
snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path,
|
|
index);
|
|
fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE);
|
|
if (fd >= 0) {
|
|
partition_found = true;
|
|
qemu_close(fd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if a working partition on the device was not found */
|
|
if (partition_found == false) {
|
|
error_setg(errp, "Failed to find a working partition on disc");
|
|
} else {
|
|
DPRINTF("Using %s as optical disc\n", test_partition);
|
|
pstrcpy(bsd_path, MAXPATHLEN, test_partition);
|
|
}
|
|
return partition_found;
|
|
}
|
|
|
|
/* Prints directions on mounting and unmounting a device */
|
|
static void print_unmounting_directions(const char *file_name)
|
|
{
|
|
error_report("If device %s is mounted on the desktop, unmount"
|
|
" it first before using it in QEMU", file_name);
|
|
error_report("Command to unmount device: diskutil unmountDisk %s",
|
|
file_name);
|
|
error_report("Command to mount device: diskutil mountDisk %s", file_name);
|
|
}
|
|
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
|
|
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 check_hdev_writable(BDRVRawState *s)
|
|
{
|
|
#if defined(BLKROGET)
|
|
/* Linux block devices can be configured "read-only" using blockdev(8).
|
|
* This is independent of device node permissions and therefore open(2)
|
|
* with O_RDWR succeeds. Actual writes fail with EPERM.
|
|
*
|
|
* bdrv_open() is supposed to fail if the disk is read-only. Explicitly
|
|
* check for read-only block devices so that Linux block devices behave
|
|
* properly.
|
|
*/
|
|
struct stat st;
|
|
int readonly = 0;
|
|
|
|
if (fstat(s->fd, &st)) {
|
|
return -errno;
|
|
}
|
|
|
|
if (!S_ISBLK(st.st_mode)) {
|
|
return 0;
|
|
}
|
|
|
|
if (ioctl(s->fd, BLKROGET, &readonly) < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
if (readonly) {
|
|
return -EACCES;
|
|
}
|
|
#endif /* defined(BLKROGET) */
|
|
return 0;
|
|
}
|
|
|
|
static void hdev_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
/* The prefix is optional, just as for "file". */
|
|
strstart(filename, "host_device:", &filename);
|
|
|
|
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
|
|
}
|
|
|
|
static bool hdev_is_sg(BlockDriverState *bs)
|
|
{
|
|
|
|
#if defined(__linux__)
|
|
|
|
BDRVRawState *s = bs->opaque;
|
|
struct stat st;
|
|
struct sg_scsi_id scsiid;
|
|
int sg_version;
|
|
int ret;
|
|
|
|
if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) {
|
|
return false;
|
|
}
|
|
|
|
ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version);
|
|
if (ret < 0) {
|
|
return false;
|
|
}
|
|
|
|
ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid);
|
|
if (ret >= 0) {
|
|
DPRINTF("SG device found: type=%d, version=%d\n",
|
|
scsiid.scsi_type, sg_version);
|
|
return true;
|
|
}
|
|
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
/*
|
|
* Caution: while qdict_get_str() is fine, getting non-string types
|
|
* would require more care. When @options come from -blockdev or
|
|
* blockdev_add, its members are typed according to the QAPI
|
|
* schema, but when they come from -drive, they're all QString.
|
|
*/
|
|
const char *filename = qdict_get_str(options, "filename");
|
|
char bsd_path[MAXPATHLEN] = "";
|
|
bool error_occurred = false;
|
|
|
|
/* If using a real cdrom */
|
|
if (strcmp(filename, "/dev/cdrom") == 0) {
|
|
char *mediaType = NULL;
|
|
kern_return_t ret_val;
|
|
io_iterator_t mediaIterator = 0;
|
|
|
|
mediaType = FindEjectableOpticalMedia(&mediaIterator);
|
|
if (mediaType == NULL) {
|
|
error_setg(errp, "Please make sure your CD/DVD is in the optical"
|
|
" drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags);
|
|
if (ret_val != KERN_SUCCESS) {
|
|
error_setg(errp, "Could not get BSD path for optical drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
/* If a real optical drive was not found */
|
|
if (bsd_path[0] == '\0') {
|
|
error_setg(errp, "Failed to obtain bsd path for optical drive");
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
/* If using a cdrom disc and finding a partition on the disc failed */
|
|
if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 &&
|
|
setup_cdrom(bsd_path, errp) == false) {
|
|
print_unmounting_directions(bsd_path);
|
|
error_occurred = true;
|
|
goto hdev_open_Mac_error;
|
|
}
|
|
|
|
qdict_put(options, "filename", qstring_from_str(bsd_path));
|
|
|
|
hdev_open_Mac_error:
|
|
g_free(mediaType);
|
|
if (mediaIterator) {
|
|
IOObjectRelease(mediaIterator);
|
|
}
|
|
if (error_occurred) {
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
|
|
s->type = FTYPE_FILE;
|
|
|
|
ret = raw_open_common(bs, options, flags, 0, &local_err);
|
|
if (ret < 0) {
|
|
error_propagate(errp, local_err);
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
if (*bsd_path) {
|
|
filename = bsd_path;
|
|
}
|
|
/* if a physical device experienced an error while being opened */
|
|
if (strncmp(filename, "/dev/", 5) == 0) {
|
|
print_unmounting_directions(filename);
|
|
}
|
|
#endif /* defined(__APPLE__) && defined(__MACH__) */
|
|
return ret;
|
|
}
|
|
|
|
/* Since this does ioctl the device must be already opened */
|
|
bs->sg = hdev_is_sg(bs);
|
|
|
|
if (flags & BDRV_O_RDWR) {
|
|
ret = check_hdev_writable(s);
|
|
if (ret < 0) {
|
|
raw_close(bs);
|
|
error_setg_errno(errp, -ret, "The device is not writable");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(__linux__)
|
|
|
|
static BlockAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
|
|
unsigned long int req, void *buf,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
RawPosixAIOData *acb;
|
|
ThreadPool *pool;
|
|
|
|
if (fd_open(bs) < 0)
|
|
return NULL;
|
|
|
|
acb = g_new(RawPosixAIOData, 1);
|
|
acb->bs = bs;
|
|
acb->aio_type = QEMU_AIO_IOCTL;
|
|
acb->aio_fildes = s->fd;
|
|
acb->aio_offset = 0;
|
|
acb->aio_ioctl_buf = buf;
|
|
acb->aio_ioctl_cmd = req;
|
|
pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
|
|
return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
|
|
}
|
|
#endif /* linux */
|
|
|
|
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;
|
|
}
|
|
|
|
static coroutine_fn BlockAIOCB *hdev_aio_pdiscard(BlockDriverState *bs,
|
|
int64_t offset, int count,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
|
|
if (fd_open(bs) < 0) {
|
|
return NULL;
|
|
}
|
|
return paio_submit(bs, s->fd, offset, NULL, count,
|
|
cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
|
|
}
|
|
|
|
static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs,
|
|
int64_t offset, int count, BdrvRequestFlags flags)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int rc;
|
|
|
|
rc = fd_open(bs);
|
|
if (rc < 0) {
|
|
return rc;
|
|
}
|
|
if (!(flags & BDRV_REQ_MAY_UNMAP)) {
|
|
return paio_submit_co(bs, s->fd, offset, NULL, count,
|
|
QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV);
|
|
} else if (s->discard_zeroes) {
|
|
return paio_submit_co(bs, s->fd, offset, NULL, count,
|
|
QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
static int hdev_create(const char *filename, QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
int fd;
|
|
int ret = 0;
|
|
struct stat stat_buf;
|
|
int64_t total_size = 0;
|
|
bool has_prefix;
|
|
|
|
/* This function is used by both protocol block drivers and therefore either
|
|
* of these prefixes may be given.
|
|
* The return value has to be stored somewhere, otherwise this is an error
|
|
* due to -Werror=unused-value. */
|
|
has_prefix =
|
|
strstart(filename, "host_device:", &filename) ||
|
|
strstart(filename, "host_cdrom:" , &filename);
|
|
|
|
(void)has_prefix;
|
|
|
|
ret = raw_normalize_devicepath(&filename);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Could not normalize device path");
|
|
return ret;
|
|
}
|
|
|
|
/* Read out options */
|
|
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
|
|
fd = qemu_open(filename, O_WRONLY | O_BINARY);
|
|
if (fd < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, -ret, "Could not open device");
|
|
return ret;
|
|
}
|
|
|
|
if (fstat(fd, &stat_buf) < 0) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, -ret, "Could not stat device");
|
|
} else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) {
|
|
error_setg(errp,
|
|
"The given file is neither a block nor a character device");
|
|
ret = -ENODEV;
|
|
} else if (lseek(fd, 0, SEEK_END) < total_size) {
|
|
error_setg(errp, "Device is too small");
|
|
ret = -ENOSPC;
|
|
}
|
|
|
|
qemu_close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static BlockDriver bdrv_host_device = {
|
|
.format_name = "host_device",
|
|
.protocol_name = "host_device",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_needs_filename = true,
|
|
.bdrv_probe_device = hdev_probe_device,
|
|
.bdrv_parse_filename = hdev_parse_filename,
|
|
.bdrv_file_open = hdev_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_reopen_prepare = raw_reopen_prepare,
|
|
.bdrv_reopen_commit = raw_reopen_commit,
|
|
.bdrv_reopen_abort = raw_reopen_abort,
|
|
.bdrv_create = hdev_create,
|
|
.create_opts = &raw_create_opts,
|
|
.bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
.bdrv_aio_pdiscard = hdev_aio_pdiscard,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_info = raw_get_info,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
.bdrv_probe_blocksizes = hdev_probe_blocksizes,
|
|
.bdrv_probe_geometry = hdev_probe_geometry,
|
|
|
|
/* generic scsi device */
|
|
#ifdef __linux__
|
|
.bdrv_aio_ioctl = hdev_aio_ioctl,
|
|
#endif
|
|
};
|
|
|
|
#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
static void cdrom_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
/* The prefix is optional, just as for "file". */
|
|
strstart(filename, "host_cdrom:", &filename);
|
|
|
|
qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
|
|
}
|
|
#endif
|
|
|
|
#ifdef __linux__
|
|
static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
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, options, flags, O_NONBLOCK, errp);
|
|
}
|
|
|
|
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 bool cdrom_is_inserted(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
int ret;
|
|
|
|
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
|
|
return ret == CDS_DISC_OK;
|
|
}
|
|
|
|
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_needs_filename = true,
|
|
.bdrv_probe_device = cdrom_probe_device,
|
|
.bdrv_parse_filename = cdrom_parse_filename,
|
|
.bdrv_file_open = cdrom_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_reopen_prepare = raw_reopen_prepare,
|
|
.bdrv_reopen_commit = raw_reopen_commit,
|
|
.bdrv_reopen_abort = raw_reopen_abort,
|
|
.bdrv_create = hdev_create,
|
|
.create_opts = &raw_create_opts,
|
|
|
|
|
|
.bdrv_co_preadv = raw_co_preadv,
|
|
.bdrv_co_pwritev = raw_co_pwritev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
.bdrv_refresh_limits = raw_refresh_limits,
|
|
.bdrv_io_plug = raw_aio_plug,
|
|
.bdrv_io_unplug = raw_aio_unplug,
|
|
|
|
.bdrv_truncate = raw_truncate,
|
|
.bdrv_getlength = raw_getlength,
|
|
.has_variable_length = true,
|
|
.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_aio_ioctl = hdev_aio_ioctl,
|
|
};
|
|
#endif /* __linux__ */
|
|
|
|
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
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static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVRawState *s = bs->opaque;
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Error *local_err = NULL;
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int ret;
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s->type = FTYPE_CD;
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ret = raw_open_common(bs, options, flags, 0, &local_err);
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if (ret) {
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error_propagate(errp, local_err);
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return ret;
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}
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/* make sure the door isn't locked at this time */
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ioctl(s->fd, CDIOCALLOW);
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return 0;
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}
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static int cdrom_probe_device(const char *filename)
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{
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if (strstart(filename, "/dev/cd", NULL) ||
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strstart(filename, "/dev/acd", NULL))
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return 100;
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return 0;
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}
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static int cdrom_reopen(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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int fd;
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/*
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* Force reread of possibly changed/newly loaded disc,
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* FreeBSD seems to not notice sometimes...
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*/
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if (s->fd >= 0)
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qemu_close(s->fd);
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fd = qemu_open(bs->filename, s->open_flags, 0644);
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if (fd < 0) {
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s->fd = -1;
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return -EIO;
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}
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s->fd = fd;
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/* make sure the door isn't locked at this time */
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ioctl(s->fd, CDIOCALLOW);
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return 0;
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}
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static bool cdrom_is_inserted(BlockDriverState *bs)
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{
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return raw_getlength(bs) > 0;
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}
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static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
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{
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BDRVRawState *s = bs->opaque;
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if (s->fd < 0)
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return;
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(void) ioctl(s->fd, CDIOCALLOW);
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if (eject_flag) {
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if (ioctl(s->fd, CDIOCEJECT) < 0)
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perror("CDIOCEJECT");
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} else {
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if (ioctl(s->fd, CDIOCCLOSE) < 0)
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perror("CDIOCCLOSE");
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}
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cdrom_reopen(bs);
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}
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static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
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{
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BDRVRawState *s = bs->opaque;
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if (s->fd < 0)
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return;
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if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
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/*
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* Note: an error can happen if the distribution automatically
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* mounts the CD-ROM
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*/
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/* perror("CDROM_LOCKDOOR"); */
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}
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}
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static BlockDriver bdrv_host_cdrom = {
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.format_name = "host_cdrom",
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.protocol_name = "host_cdrom",
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.instance_size = sizeof(BDRVRawState),
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.bdrv_needs_filename = true,
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.bdrv_probe_device = cdrom_probe_device,
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.bdrv_parse_filename = cdrom_parse_filename,
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.bdrv_file_open = cdrom_open,
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.bdrv_close = raw_close,
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.bdrv_reopen_prepare = raw_reopen_prepare,
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.bdrv_reopen_commit = raw_reopen_commit,
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.bdrv_reopen_abort = raw_reopen_abort,
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.bdrv_create = hdev_create,
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.create_opts = &raw_create_opts,
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.bdrv_co_preadv = raw_co_preadv,
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.bdrv_co_pwritev = raw_co_pwritev,
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.bdrv_aio_flush = raw_aio_flush,
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.bdrv_refresh_limits = raw_refresh_limits,
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.bdrv_io_plug = raw_aio_plug,
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.bdrv_io_unplug = raw_aio_unplug,
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.bdrv_truncate = raw_truncate,
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.bdrv_getlength = raw_getlength,
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.has_variable_length = true,
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.bdrv_get_allocated_file_size
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= raw_get_allocated_file_size,
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/* removable device support */
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.bdrv_is_inserted = cdrom_is_inserted,
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.bdrv_eject = cdrom_eject,
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.bdrv_lock_medium = cdrom_lock_medium,
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};
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#endif /* __FreeBSD__ */
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static void bdrv_file_init(void)
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{
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/*
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* Register all the drivers. Note that order is important, the driver
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* registered last will get probed first.
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*/
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bdrv_register(&bdrv_file);
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bdrv_register(&bdrv_host_device);
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#ifdef __linux__
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bdrv_register(&bdrv_host_cdrom);
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#endif
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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bdrv_register(&bdrv_host_cdrom);
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#endif
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}
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block_init(bdrv_file_init);
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