Imported Upstream version 1.2.0upstream/1.2.0

1 files changed, 1383 insertions, 0 deletions

diff --git a/block/raw-posix.c b/block/raw-posix.c
new file mode 100644
index 000000000..6be20b192
--- /dev/null
+++ b/block/raw-posix.c
@@ -0,0 +1,1383 @@
+/*
+ * Block driver for RAW files (posix)
+ *
+ * Copyright (c) 2006 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu-common.h"
+#include "qemu-timer.h"
+#include "qemu-char.h"
+#include "qemu-log.h"
+#include "block_int.h"
+#include "module.h"
+#include "block/raw-posix-aio.h"
+
+#if defined(__APPLE__) && (__MACH__)
+#include <paths.h>
+#include <sys/param.h>
+#include <IOKit/IOKitLib.h>
+#include <IOKit/IOBSD.h>
+#include <IOKit/storage/IOMediaBSDClient.h>
+#include <IOKit/storage/IOMedia.h>
+#include <IOKit/storage/IOCDMedia.h>
+//#include <IOKit/storage/IOCDTypes.h>
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+#ifdef __sun__
+#define _POSIX_PTHREAD_SEMANTICS 1
+#include <sys/dkio.h>
+#endif
+#ifdef __linux__
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <linux/cdrom.h>
+#include <linux/fd.h>
+#include <linux/fs.h>
+#endif
+#ifdef CONFIG_FIEMAP
+#include <linux/fiemap.h>
+#endif
+#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
+#include <sys/disk.h>
+#include <sys/cdio.h>
+#endif
+
+#ifdef __OpenBSD__
+#include <sys/ioctl.h>
+#include <sys/disklabel.h>
+#include <sys/dkio.h>
+#endif
+
+#ifdef __NetBSD__
+#include <sys/ioctl.h>
+#include <sys/disklabel.h>
+#include <sys/dkio.h>
+#include <sys/disk.h>
+#endif
+
+#ifdef __DragonFly__
+#include <sys/ioctl.h>
+#include <sys/diskslice.h>
+#endif
+
+#ifdef CONFIG_XFS
+#include <xfs/xfs.h>
+#endif
+
+//#define DEBUG_FLOPPY
+
+//#define DEBUG_BLOCK
+#if defined(DEBUG_BLOCK)
+#define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
+    { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
+#else
+#define DEBUG_BLOCK_PRINT(formatCstr, ...)
+#endif
+
+/* OS X does not have O_DSYNC */
+#ifndef O_DSYNC
+#ifdef O_SYNC
+#define O_DSYNC O_SYNC
+#elif defined(O_FSYNC)
+#define O_DSYNC O_FSYNC
+#endif
+#endif
+
+/* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
+#ifndef O_DIRECT
+#define O_DIRECT O_DSYNC
+#endif
+
+#define FTYPE_FILE   0
+#define FTYPE_CD     1
+#define FTYPE_FD     2
+
+/* if the FD is not accessed during that time (in ns), we try to
+   reopen it to see if the disk has been changed */
+#define FD_OPEN_TIMEOUT (1000000000)
+
+#define MAX_BLOCKSIZE	4096
+
+typedef struct BDRVRawState {
+    int fd;
+    int type;
+    int open_flags;
+#if defined(__linux__)
+    /* linux floppy specific */
+    int64_t fd_open_time;
+    int64_t fd_error_time;
+    int fd_got_error;
+    int fd_media_changed;
+#endif
+#ifdef CONFIG_LINUX_AIO
+    int use_aio;
+    void *aio_ctx;
+#endif
+    uint8_t *aligned_buf;
+    unsigned aligned_buf_size;
+#ifdef CONFIG_XFS
+    bool is_xfs : 1;
+#endif
+} BDRVRawState;
+
+static int fd_open(BlockDriverState *bs);
+static int64_t raw_getlength(BlockDriverState *bs);
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+static int cdrom_reopen(BlockDriverState *bs);
+#endif
+
+#if defined(__NetBSD__)
+static int raw_normalize_devicepath(const char **filename)
+{
+    static char namebuf[PATH_MAX];
+    const char *dp, *fname;
+    struct stat sb;
+
+    fname = *filename;
+    dp = strrchr(fname, '/');
+    if (lstat(fname, &sb) < 0) {
+        fprintf(stderr, "%s: stat failed: %s\n",
+            fname, strerror(errno));
+        return -errno;
+    }
+
+    if (!S_ISBLK(sb.st_mode)) {
+        return 0;
+    }
+
+    if (dp == NULL) {
+        snprintf(namebuf, PATH_MAX, "r%s", fname);
+    } else {
+        snprintf(namebuf, PATH_MAX, "%.*s/r%s",
+            (int)(dp - fname), fname, dp + 1);
+    }
+    fprintf(stderr, "%s is a block device", fname);
+    *filename = namebuf;
+    fprintf(stderr, ", using %s\n", *filename);
+
+    return 0;
+}
+#else
+static int raw_normalize_devicepath(const char **filename)
+{
+    return 0;
+}
+#endif
+
+static int raw_open_common(BlockDriverState *bs, const char *filename,
+                           int bdrv_flags, int open_flags)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd, ret;
+
+    ret = raw_normalize_devicepath(&filename);
+    if (ret != 0) {
+        return ret;
+    }
+
+    s->open_flags = open_flags | O_BINARY;
+    s->open_flags &= ~O_ACCMODE;
+    if (bdrv_flags & BDRV_O_RDWR) {
+        s->open_flags |= O_RDWR;
+    } else {
+        s->open_flags |= O_RDONLY;
+    }
+
+    /* Use O_DSYNC for write-through caching, no flags for write-back caching,
+     * and O_DIRECT for no caching. */
+    if ((bdrv_flags & BDRV_O_NOCACHE))
+        s->open_flags |= O_DIRECT;
+    if (!(bdrv_flags & BDRV_O_CACHE_WB))
+        s->open_flags |= O_DSYNC;
+
+    s->fd = -1;
+    fd = qemu_open(filename, s->open_flags, 0644);
+    if (fd < 0) {
+        ret = -errno;
+        if (ret == -EROFS)
+            ret = -EACCES;
+        return ret;
+    }
+    s->fd = fd;
+    s->aligned_buf = NULL;
+
+    if ((bdrv_flags & BDRV_O_NOCACHE)) {
+        /*
+         * Allocate a buffer for read/modify/write cycles.  Chose the size
+         * pessimistically as we don't know the block size yet.
+         */
+        s->aligned_buf_size = 32 * MAX_BLOCKSIZE;
+        s->aligned_buf = qemu_memalign(MAX_BLOCKSIZE, s->aligned_buf_size);
+        if (s->aligned_buf == NULL) {
+            goto out_close;
+        }
+    }
+
+    /* We're falling back to POSIX AIO in some cases so init always */
+    if (paio_init() < 0) {
+        goto out_free_buf;
+    }
+
+#ifdef CONFIG_LINUX_AIO
+    /*
+     * Currently Linux do AIO only for files opened with O_DIRECT
+     * specified so check NOCACHE flag too
+     */
+    if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
+                      (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
+
+        s->aio_ctx = laio_init();
+        if (!s->aio_ctx) {
+            goto out_free_buf;
+        }
+        s->use_aio = 1;
+    } else
+#endif
+    {
+#ifdef CONFIG_LINUX_AIO
+        s->use_aio = 0;
+#endif
+    }
+
+#ifdef CONFIG_XFS
+    if (platform_test_xfs_fd(s->fd)) {
+        s->is_xfs = 1;
+    }
+#endif
+
+    return 0;
+
+out_free_buf:
+    qemu_vfree(s->aligned_buf);
+out_close:
+    qemu_close(fd);
+    return -errno;
+}
+
+static int raw_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+
+    s->type = FTYPE_FILE;
+    return raw_open_common(bs, filename, flags, 0);
+}
+
+/* XXX: use host sector size if necessary with:
+#ifdef DIOCGSECTORSIZE
+        {
+            unsigned int sectorsize = 512;
+            if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
+                sectorsize > bufsize)
+                bufsize = sectorsize;
+        }
+#endif
+#ifdef CONFIG_COCOA
+        uint32_t blockSize = 512;
+        if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
+            bufsize = blockSize;
+        }
+#endif
+*/
+
+/*
+ * Check if all memory in this vector is sector aligned.
+ */
+static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
+{
+    int i;
+
+    for (i = 0; i < qiov->niov; i++) {
+        if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
+            return 0;
+        }
+    }
+
+    return 1;
+}
+
+static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque, int type)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (fd_open(bs) < 0)
+        return NULL;
+
+    /*
+     * If O_DIRECT is used the buffer needs to be aligned on a sector
+     * boundary.  Check if this is the case or tell the low-level
+     * driver that it needs to copy the buffer.
+     */
+    if (s->aligned_buf) {
+        if (!qiov_is_aligned(bs, qiov)) {
+            type |= QEMU_AIO_MISALIGNED;
+#ifdef CONFIG_LINUX_AIO
+        } else if (s->use_aio) {
+            return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
+                               nb_sectors, cb, opaque, type);
+#endif
+        }
+    }
+
+    return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
+                       cb, opaque, type);
+}
+
+static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
+                          cb, opaque, QEMU_AIO_READ);
+}
+
+static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
+                          cb, opaque, QEMU_AIO_WRITE);
+}
+
+static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (fd_open(bs) < 0)
+        return NULL;
+
+    return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
+}
+
+static void raw_close(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    if (s->fd >= 0) {
+        qemu_close(s->fd);
+        s->fd = -1;
+        if (s->aligned_buf != NULL)
+            qemu_vfree(s->aligned_buf);
+    }
+}
+
+static int raw_truncate(BlockDriverState *bs, int64_t offset)
+{
+    BDRVRawState *s = bs->opaque;
+    struct stat st;
+
+    if (fstat(s->fd, &st)) {
+        return -errno;
+    }
+
+    if (S_ISREG(st.st_mode)) {
+        if (ftruncate(s->fd, offset) < 0) {
+            return -errno;
+        }
+    } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
+       if (offset > raw_getlength(bs)) {
+           return -EINVAL;
+       }
+    } else {
+        return -ENOTSUP;
+    }
+
+    return 0;
+}
+
+#ifdef __OpenBSD__
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd = s->fd;
+    struct stat st;
+
+    if (fstat(fd, &st))
+        return -1;
+    if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
+        struct disklabel dl;
+
+        if (ioctl(fd, DIOCGDINFO, &dl))
+            return -1;
+        return (uint64_t)dl.d_secsize *
+            dl.d_partitions[DISKPART(st.st_rdev)].p_size;
+    } else
+        return st.st_size;
+}
+#elif defined(__NetBSD__)
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd = s->fd;
+    struct stat st;
+
+    if (fstat(fd, &st))
+        return -1;
+    if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
+        struct dkwedge_info dkw;
+
+        if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
+            return dkw.dkw_size * 512;
+        } else {
+            struct disklabel dl;
+
+            if (ioctl(fd, DIOCGDINFO, &dl))
+                return -1;
+            return (uint64_t)dl.d_secsize *
+                dl.d_partitions[DISKPART(st.st_rdev)].p_size;
+        }
+    } else
+        return st.st_size;
+}
+#elif defined(__sun__)
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    struct dk_minfo minfo;
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0) {
+        return ret;
+    }
+
+    /*
+     * Use the DKIOCGMEDIAINFO ioctl to read the size.
+     */
+    ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
+    if (ret != -1) {
+        return minfo.dki_lbsize * minfo.dki_capacity;
+    }
+
+    /*
+     * There are reports that lseek on some devices fails, but
+     * irc discussion said that contingency on contingency was overkill.
+     */
+    return lseek(s->fd, 0, SEEK_END);
+}
+#elif defined(CONFIG_BSD)
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd = s->fd;
+    int64_t size;
+    struct stat sb;
+#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
+    int reopened = 0;
+#endif
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0)
+        return ret;
+
+#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
+again:
+#endif
+    if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
+#ifdef DIOCGMEDIASIZE
+	if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
+#elif defined(DIOCGPART)
+        {
+                struct partinfo pi;
+                if (ioctl(fd, DIOCGPART, &pi) == 0)
+                        size = pi.media_size;
+                else
+                        size = 0;
+        }
+        if (size == 0)
+#endif
+#if defined(__APPLE__) && defined(__MACH__)
+        size = LONG_LONG_MAX;
+#else
+        size = lseek(fd, 0LL, SEEK_END);
+#endif
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+        switch(s->type) {
+        case FTYPE_CD:
+            /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
+            if (size == 2048LL * (unsigned)-1)
+                size = 0;
+            /* XXX no disc?  maybe we need to reopen... */
+            if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
+                reopened = 1;
+                goto again;
+            }
+        }
+#endif
+    } else {
+        size = lseek(fd, 0, SEEK_END);
+    }
+    return size;
+}
+#else
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return lseek(s->fd, 0, SEEK_END);
+}
+#endif
+
+static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
+{
+    struct stat st;
+    BDRVRawState *s = bs->opaque;
+
+    if (fstat(s->fd, &st) < 0) {
+        return -errno;
+    }
+    return (int64_t)st.st_blocks * 512;
+}
+
+static int raw_create(const char *filename, QEMUOptionParameter *options)
+{
+    int fd;
+    int result = 0;
+    int64_t total_size = 0;
+
+    /* Read out options */
+    while (options && options->name) {
+        if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
+            total_size = options->value.n / BDRV_SECTOR_SIZE;
+        }
+        options++;
+    }
+
+    fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+                   0644);
+    if (fd < 0) {
+        result = -errno;
+    } else {
+        if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
+            result = -errno;
+        }
+        if (qemu_close(fd) != 0) {
+            result = -errno;
+        }
+    }
+    return result;
+}
+
+/*
+ * Returns true iff the specified sector is present in the disk image. Drivers
+ * not implementing the functionality are assumed to not support backing files,
+ * hence all their sectors are reported as allocated.
+ *
+ * If 'sector_num' is beyond the end of the disk image the return value is 0
+ * and 'pnum' is set to 0.
+ *
+ * 'pnum' is set to the number of sectors (including and immediately following
+ * the specified sector) that are known to be in the same
+ * allocated/unallocated state.
+ *
+ * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
+ * beyond the end of the disk image it will be clamped.
+ */
+static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
+                                            int64_t sector_num,
+                                            int nb_sectors, int *pnum)
+{
+    off_t start, data, hole;
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0) {
+        return ret;
+    }
+
+    start = sector_num * BDRV_SECTOR_SIZE;
+
+#ifdef CONFIG_FIEMAP
+
+    BDRVRawState *s = bs->opaque;
+    struct {
+        struct fiemap fm;
+        struct fiemap_extent fe;
+    } f;
+
+    f.fm.fm_start = start;
+    f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
+    f.fm.fm_flags = 0;
+    f.fm.fm_extent_count = 1;
+    f.fm.fm_reserved = 0;
+    if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
+        /* Assume everything is allocated.  */
+        *pnum = nb_sectors;
+        return 1;
+    }
+
+    if (f.fm.fm_mapped_extents == 0) {
+        /* No extents found, data is beyond f.fm.fm_start + f.fm.fm_length.
+         * f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
+         */
+        off_t length = lseek(s->fd, 0, SEEK_END);
+        hole = f.fm.fm_start;
+        data = MIN(f.fm.fm_start + f.fm.fm_length, length);
+    } else {
+        data = f.fe.fe_logical;
+        hole = f.fe.fe_logical + f.fe.fe_length;
+    }
+
+#elif defined SEEK_HOLE && defined SEEK_DATA
+
+    BDRVRawState *s = bs->opaque;
+
+    hole = lseek(s->fd, start, SEEK_HOLE);
+    if (hole == -1) {
+        /* -ENXIO indicates that sector_num was past the end of the file.
+         * There is a virtual hole there.  */
+        assert(errno != -ENXIO);
+
+        /* Most likely EINVAL.  Assume everything is allocated.  */
+        *pnum = nb_sectors;
+        return 1;
+    }
+
+    if (hole > start) {
+        data = start;
+    } else {
+        /* On a hole.  We need another syscall to find its end.  */
+        data = lseek(s->fd, start, SEEK_DATA);
+        if (data == -1) {
+            data = lseek(s->fd, 0, SEEK_END);
+        }
+    }
+#else
+    *pnum = nb_sectors;
+    return 1;
+#endif
+
+    if (data <= start) {
+        /* On a data extent, compute sectors to the end of the extent.  */
+        *pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
+        return 1;
+    } else {
+        /* On a hole, compute sectors to the beginning of the next extent.  */
+        *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
+        return 0;
+    }
+}
+
+#ifdef CONFIG_XFS
+static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
+{
+    struct xfs_flock64 fl;
+
+    memset(&fl, 0, sizeof(fl));
+    fl.l_whence = SEEK_SET;
+    fl.l_start = sector_num << 9;
+    fl.l_len = (int64_t)nb_sectors << 9;
+
+    if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
+        DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno));
+        return -errno;
+    }
+
+    return 0;
+}
+#endif
+
+static coroutine_fn int raw_co_discard(BlockDriverState *bs,
+    int64_t sector_num, int nb_sectors)
+{
+#ifdef CONFIG_XFS
+    BDRVRawState *s = bs->opaque;
+
+    if (s->is_xfs) {
+        return xfs_discard(s, sector_num, nb_sectors);
+    }
+#endif
+
+    return 0;
+}
+
+static QEMUOptionParameter raw_create_options[] = {
+    {
+        .name = BLOCK_OPT_SIZE,
+        .type = OPT_SIZE,
+        .help = "Virtual disk size"
+    },
+    { NULL }
+};
+
+static BlockDriver bdrv_file = {
+    .format_name = "file",
+    .protocol_name = "file",
+    .instance_size = sizeof(BDRVRawState),
+    .bdrv_probe = NULL, /* no probe for protocols */
+    .bdrv_file_open = raw_open,
+    .bdrv_close = raw_close,
+    .bdrv_create = raw_create,
+    .bdrv_co_discard = raw_co_discard,
+    .bdrv_co_is_allocated = raw_co_is_allocated,
+
+    .bdrv_aio_readv = raw_aio_readv,
+    .bdrv_aio_writev = raw_aio_writev,
+    .bdrv_aio_flush = raw_aio_flush,
+
+    .bdrv_truncate = raw_truncate,
+    .bdrv_getlength = raw_getlength,
+    .bdrv_get_allocated_file_size
+                        = raw_get_allocated_file_size,
+
+    .create_options = raw_create_options,
+};
+
+/***********************************************/
+/* host device */
+
+#if defined(__APPLE__) && defined(__MACH__)
+static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
+static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
+
+kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
+{
+    kern_return_t       kernResult;
+    mach_port_t     masterPort;
+    CFMutableDictionaryRef  classesToMatch;
+
+    kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
+    if ( KERN_SUCCESS != kernResult ) {
+        printf( "IOMasterPort returned %d\n", kernResult );
+    }
+
+    classesToMatch = IOServiceMatching( kIOCDMediaClass );
+    if ( classesToMatch == NULL ) {
+        printf( "IOServiceMatching returned a NULL dictionary.\n" );
+    } else {
+    CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
+    }
+    kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
+    if ( KERN_SUCCESS != kernResult )
+    {
+        printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
+    }
+
+    return kernResult;
+}
+
+kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
+{
+    io_object_t     nextMedia;
+    kern_return_t   kernResult = KERN_FAILURE;
+    *bsdPath = '\0';
+    nextMedia = IOIteratorNext( mediaIterator );
+    if ( nextMedia )
+    {
+        CFTypeRef   bsdPathAsCFString;
+    bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
+        if ( bsdPathAsCFString ) {
+            size_t devPathLength;
+            strcpy( bsdPath, _PATH_DEV );
+            strcat( bsdPath, "r" );
+            devPathLength = strlen( bsdPath );
+            if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
+                kernResult = KERN_SUCCESS;
+            }
+            CFRelease( bsdPathAsCFString );
+        }
+        IOObjectRelease( nextMedia );
+    }
+
+    return kernResult;
+}
+
+#endif
+
+static int hdev_probe_device(const char *filename)
+{
+    struct stat st;
+
+    /* allow a dedicated CD-ROM driver to match with a higher priority */
+    if (strstart(filename, "/dev/cdrom", NULL))
+        return 50;
+
+    if (stat(filename, &st) >= 0 &&
+            (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
+        return 100;
+    }
+
+    return 0;
+}
+
+static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+
+#if defined(__APPLE__) && defined(__MACH__)
+    if (strstart(filename, "/dev/cdrom", NULL)) {
+        kern_return_t kernResult;
+        io_iterator_t mediaIterator;
+        char bsdPath[ MAXPATHLEN ];
+        int fd;
+
+        kernResult = FindEjectableCDMedia( &mediaIterator );
+        kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
+
+        if ( bsdPath[ 0 ] != '\0' ) {
+            strcat(bsdPath,"s0");
+            /* some CDs don't have a partition 0 */
+            fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
+            if (fd < 0) {
+                bsdPath[strlen(bsdPath)-1] = '1';
+            } else {
+                qemu_close(fd);
+            }
+            filename = bsdPath;
+        }
+
+        if ( mediaIterator )
+            IOObjectRelease( mediaIterator );
+    }
+#endif
+
+    s->type = FTYPE_FILE;
+#if defined(__linux__)
+    {
+        char resolved_path[ MAXPATHLEN ], *temp;
+
+        temp = realpath(filename, resolved_path);
+        if (temp && strstart(temp, "/dev/sg", NULL)) {
+            bs->sg = 1;
+        }
+    }
+#endif
+
+    return raw_open_common(bs, filename, flags, 0);
+}
+
+#if defined(__linux__)
+/* Note: we do not have a reliable method to detect if the floppy is
+   present. The current method is to try to open the floppy at every
+   I/O and to keep it opened during a few hundreds of ms. */
+static int fd_open(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int last_media_present;
+
+    if (s->type != FTYPE_FD)
+        return 0;
+    last_media_present = (s->fd >= 0);
+    if (s->fd >= 0 &&
+        (get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
+        qemu_close(s->fd);
+        s->fd = -1;
+#ifdef DEBUG_FLOPPY
+        printf("Floppy closed\n");
+#endif
+    }
+    if (s->fd < 0) {
+        if (s->fd_got_error &&
+            (get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
+#ifdef DEBUG_FLOPPY
+            printf("No floppy (open delayed)\n");
+#endif
+            return -EIO;
+        }
+        s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
+        if (s->fd < 0) {
+            s->fd_error_time = get_clock();
+            s->fd_got_error = 1;
+            if (last_media_present)
+                s->fd_media_changed = 1;
+#ifdef DEBUG_FLOPPY
+            printf("No floppy\n");
+#endif
+            return -EIO;
+        }
+#ifdef DEBUG_FLOPPY
+        printf("Floppy opened\n");
+#endif
+    }
+    if (!last_media_present)
+        s->fd_media_changed = 1;
+    s->fd_open_time = get_clock();
+    s->fd_got_error = 0;
+    return 0;
+}
+
+static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    BDRVRawState *s = bs->opaque;
+
+    return ioctl(s->fd, req, buf);
+}
+
+static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
+        unsigned long int req, void *buf,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (fd_open(bs) < 0)
+        return NULL;
+    return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
+}
+
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+static int fd_open(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+
+    /* this is just to ensure s->fd is sane (its called by io ops) */
+    if (s->fd >= 0)
+        return 0;
+    return -EIO;
+}
+#else /* !linux && !FreeBSD */
+
+static int fd_open(BlockDriverState *bs)
+{
+    return 0;
+}
+
+#endif /* !linux && !FreeBSD */
+
+static int hdev_create(const char *filename, QEMUOptionParameter *options)
+{
+    int fd;
+    int ret = 0;
+    struct stat stat_buf;
+    int64_t total_size = 0;
+
+    /* Read out options */
+    while (options && options->name) {
+        if (!strcmp(options->name, "size")) {
+            total_size = options->value.n / BDRV_SECTOR_SIZE;
+        }
+        options++;
+    }
+
+    fd = qemu_open(filename, O_WRONLY | O_BINARY);
+    if (fd < 0)
+        return -errno;
+
+    if (fstat(fd, &stat_buf) < 0)
+        ret = -errno;
+    else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
+        ret = -ENODEV;
+    else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
+        ret = -ENOSPC;
+
+    qemu_close(fd);
+    return ret;
+}
+
+static int hdev_has_zero_init(BlockDriverState *bs)
+{
+    return 0;
+}
+
+static BlockDriver bdrv_host_device = {
+    .format_name        = "host_device",
+    .protocol_name        = "host_device",
+    .instance_size      = sizeof(BDRVRawState),
+    .bdrv_probe_device  = hdev_probe_device,
+    .bdrv_file_open     = hdev_open,
+    .bdrv_close         = raw_close,
+    .bdrv_create        = hdev_create,
+    .create_options     = raw_create_options,
+    .bdrv_has_zero_init = hdev_has_zero_init,
+
+    .bdrv_aio_readv	= raw_aio_readv,
+    .bdrv_aio_writev	= raw_aio_writev,
+    .bdrv_aio_flush	= raw_aio_flush,
+
+    .bdrv_truncate      = raw_truncate,
+    .bdrv_getlength	= raw_getlength,
+    .bdrv_get_allocated_file_size
+                        = raw_get_allocated_file_size,
+
+    /* generic scsi device */
+#ifdef __linux__
+    .bdrv_ioctl         = hdev_ioctl,
+    .bdrv_aio_ioctl     = hdev_aio_ioctl,
+#endif
+};
+
+#ifdef __linux__
+static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    s->type = FTYPE_FD;
+
+    /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
+    ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
+    if (ret)
+        return ret;
+
+    /* close fd so that we can reopen it as needed */
+    qemu_close(s->fd);
+    s->fd = -1;
+    s->fd_media_changed = 1;
+
+    return 0;
+}
+
+static int floppy_probe_device(const char *filename)
+{
+    int fd, ret;
+    int prio = 0;
+    struct floppy_struct fdparam;
+    struct stat st;
+
+    if (strstart(filename, "/dev/fd", NULL) &&
+        !strstart(filename, "/dev/fdset/", NULL)) {
+        prio = 50;
+    }
+
+    fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
+    if (fd < 0) {
+        goto out;
+    }
+    ret = fstat(fd, &st);
+    if (ret == -1 || !S_ISBLK(st.st_mode)) {
+        goto outc;
+    }
+
+    /* Attempt to detect via a floppy specific ioctl */
+    ret = ioctl(fd, FDGETPRM, &fdparam);
+    if (ret >= 0)
+        prio = 100;
+
+outc:
+    qemu_close(fd);
+out:
+    return prio;
+}
+
+
+static int floppy_is_inserted(BlockDriverState *bs)
+{
+    return fd_open(bs) >= 0;
+}
+
+static int floppy_media_changed(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    /*
+     * XXX: we do not have a true media changed indication.
+     * It does not work if the floppy is changed without trying to read it.
+     */
+    fd_open(bs);
+    ret = s->fd_media_changed;
+    s->fd_media_changed = 0;
+#ifdef DEBUG_FLOPPY
+    printf("Floppy changed=%d\n", ret);
+#endif
+    return ret;
+}
+
+static void floppy_eject(BlockDriverState *bs, bool eject_flag)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd;
+
+    if (s->fd >= 0) {
+        qemu_close(s->fd);
+        s->fd = -1;
+    }
+    fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
+    if (fd >= 0) {
+        if (ioctl(fd, FDEJECT, 0) < 0)
+            perror("FDEJECT");
+        qemu_close(fd);
+    }
+}
+
+static BlockDriver bdrv_host_floppy = {
+    .format_name        = "host_floppy",
+    .protocol_name      = "host_floppy",
+    .instance_size      = sizeof(BDRVRawState),
+    .bdrv_probe_device	= floppy_probe_device,
+    .bdrv_file_open     = floppy_open,
+    .bdrv_close         = raw_close,
+    .bdrv_create        = hdev_create,
+    .create_options     = raw_create_options,
+    .bdrv_has_zero_init = hdev_has_zero_init,
+
+    .bdrv_aio_readv     = raw_aio_readv,
+    .bdrv_aio_writev    = raw_aio_writev,
+    .bdrv_aio_flush	= raw_aio_flush,
+
+    .bdrv_truncate      = raw_truncate,
+    .bdrv_getlength	= raw_getlength,
+    .bdrv_get_allocated_file_size
+                        = raw_get_allocated_file_size,
+
+    /* removable device support */
+    .bdrv_is_inserted   = floppy_is_inserted,
+    .bdrv_media_changed = floppy_media_changed,
+    .bdrv_eject         = floppy_eject,
+};
+
+static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+
+    s->type = FTYPE_CD;
+
+    /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
+    return raw_open_common(bs, filename, flags, O_NONBLOCK);
+}
+
+static int cdrom_probe_device(const char *filename)
+{
+    int fd, ret;
+    int prio = 0;
+    struct stat st;
+
+    fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
+    if (fd < 0) {
+        goto out;
+    }
+    ret = fstat(fd, &st);
+    if (ret == -1 || !S_ISBLK(st.st_mode)) {
+        goto outc;
+    }
+
+    /* Attempt to detect via a CDROM specific ioctl */
+    ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+    if (ret >= 0)
+        prio = 100;
+
+outc:
+    qemu_close(fd);
+out:
+    return prio;
+}
+
+static int cdrom_is_inserted(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+    if (ret == CDS_DISC_OK)
+        return 1;
+    return 0;
+}
+
+static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (eject_flag) {
+        if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
+            perror("CDROMEJECT");
+    } else {
+        if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
+            perror("CDROMEJECT");
+    }
+}
+
+static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
+        /*
+         * Note: an error can happen if the distribution automatically
+         * mounts the CD-ROM
+         */
+        /* perror("CDROM_LOCKDOOR"); */
+    }
+}
+
+static BlockDriver bdrv_host_cdrom = {
+    .format_name        = "host_cdrom",
+    .protocol_name      = "host_cdrom",
+    .instance_size      = sizeof(BDRVRawState),
+    .bdrv_probe_device	= cdrom_probe_device,
+    .bdrv_file_open     = cdrom_open,
+    .bdrv_close         = raw_close,
+    .bdrv_create        = hdev_create,
+    .create_options     = raw_create_options,
+    .bdrv_has_zero_init = hdev_has_zero_init,
+
+    .bdrv_aio_readv     = raw_aio_readv,
+    .bdrv_aio_writev    = raw_aio_writev,
+    .bdrv_aio_flush	= raw_aio_flush,
+
+    .bdrv_truncate      = raw_truncate,
+    .bdrv_getlength     = raw_getlength,
+    .bdrv_get_allocated_file_size
+                        = raw_get_allocated_file_size,
+
+    /* removable device support */
+    .bdrv_is_inserted   = cdrom_is_inserted,
+    .bdrv_eject         = cdrom_eject,
+    .bdrv_lock_medium   = cdrom_lock_medium,
+
+    /* generic scsi device */
+    .bdrv_ioctl         = hdev_ioctl,
+    .bdrv_aio_ioctl     = hdev_aio_ioctl,
+};
+#endif /* __linux__ */
+
+#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
+static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    s->type = FTYPE_CD;
+
+    ret = raw_open_common(bs, filename, flags, 0);
+    if (ret)
+        return ret;
+
+    /* make sure the door isn't locked at this time */
+    ioctl(s->fd, CDIOCALLOW);
+    return 0;
+}
+
+static int cdrom_probe_device(const char *filename)
+{
+    if (strstart(filename, "/dev/cd", NULL) ||
+            strstart(filename, "/dev/acd", NULL))
+        return 100;
+    return 0;
+}
+
+static int cdrom_reopen(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd;
+
+    /*
+     * Force reread of possibly changed/newly loaded disc,
+     * FreeBSD seems to not notice sometimes...
+     */
+    if (s->fd >= 0)
+        qemu_close(s->fd);
+    fd = qemu_open(bs->filename, s->open_flags, 0644);
+    if (fd < 0) {
+        s->fd = -1;
+        return -EIO;
+    }
+    s->fd = fd;
+
+    /* make sure the door isn't locked at this time */
+    ioctl(s->fd, CDIOCALLOW);
+    return 0;
+}
+
+static int cdrom_is_inserted(BlockDriverState *bs)
+{
+    return raw_getlength(bs) > 0;
+}
+
+static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (s->fd < 0)
+        return;
+
+    (void) ioctl(s->fd, CDIOCALLOW);
+
+    if (eject_flag) {
+        if (ioctl(s->fd, CDIOCEJECT) < 0)
+            perror("CDIOCEJECT");
+    } else {
+        if (ioctl(s->fd, CDIOCCLOSE) < 0)
+            perror("CDIOCCLOSE");
+    }
+
+    cdrom_reopen(bs);
+}
+
+static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
+{
+    BDRVRawState *s = bs->opaque;
+
+    if (s->fd < 0)
+        return;
+    if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
+        /*
+         * Note: an error can happen if the distribution automatically
+         * mounts the CD-ROM
+         */
+        /* perror("CDROM_LOCKDOOR"); */
+    }
+}
+
+static BlockDriver bdrv_host_cdrom = {
+    .format_name        = "host_cdrom",
+    .protocol_name      = "host_cdrom",
+    .instance_size      = sizeof(BDRVRawState),
+    .bdrv_probe_device	= cdrom_probe_device,
+    .bdrv_file_open     = cdrom_open,
+    .bdrv_close         = raw_close,
+    .bdrv_create        = hdev_create,
+    .create_options     = raw_create_options,
+    .bdrv_has_zero_init = hdev_has_zero_init,
+
+    .bdrv_aio_readv     = raw_aio_readv,
+    .bdrv_aio_writev    = raw_aio_writev,
+    .bdrv_aio_flush	= raw_aio_flush,
+
+    .bdrv_truncate      = raw_truncate,
+    .bdrv_getlength     = raw_getlength,
+    .bdrv_get_allocated_file_size
+                        = raw_get_allocated_file_size,
+
+    /* removable device support */
+    .bdrv_is_inserted   = cdrom_is_inserted,
+    .bdrv_eject         = cdrom_eject,
+    .bdrv_lock_medium   = cdrom_lock_medium,
+};
+#endif /* __FreeBSD__ */
+
+static void bdrv_file_init(void)
+{
+    /*
+     * Register all the drivers.  Note that order is important, the driver
+     * registered last will get probed first.
+     */
+    bdrv_register(&bdrv_file);
+    bdrv_register(&bdrv_host_device);
+#ifdef __linux__
+    bdrv_register(&bdrv_host_floppy);
+    bdrv_register(&bdrv_host_cdrom);
+#endif
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+    bdrv_register(&bdrv_host_cdrom);
+#endif
+}
+
+block_init(bdrv_file_init);