Move block drivers into their own directory

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1438 insertions, 0 deletions

diff --git a/block/raw-posix.c b/block/raw-posix.c
new file mode 100644
index 0000000000..f3a9476b44
--- /dev/null
+++ b/block/raw-posix.c
@@ -0,0 +1,1438 @@
+/*
+ * 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 "block_int.h"
+#include "module.h"
+#ifdef CONFIG_AIO
+#include "posix-aio-compat.h"
+#endif
+
+#ifdef CONFIG_COCOA
+#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 <signal.h>
+#include <sys/dkio.h>
+#endif
+#ifdef __linux__
+#include <sys/ioctl.h>
+#include <linux/cdrom.h>
+#include <linux/fd.h>
+#endif
+#ifdef __FreeBSD__
+#include <signal.h>
+#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 __DragonFly__
+#include <sys/ioctl.h>
+#include <sys/diskslice.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
+#define O_DSYNC O_SYNC
+#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
+
+#define ALIGNED_BUFFER_SIZE (32 * 512)
+
+/* if the FD is not accessed during that time (in ms), we try to
+   reopen it to see if the disk has been changed */
+#define FD_OPEN_TIMEOUT 1000
+
+typedef struct BDRVRawState {
+    int fd;
+    int type;
+    unsigned int lseek_err_cnt;
+#if defined(__linux__)
+    /* linux floppy specific */
+    int fd_open_flags;
+    int64_t fd_open_time;
+    int64_t fd_error_time;
+    int fd_got_error;
+    int fd_media_changed;
+#endif
+#if defined(__FreeBSD__)
+    int cd_open_flags;
+#endif
+    uint8_t* aligned_buf;
+} BDRVRawState;
+
+static int posix_aio_init(void);
+
+static int fd_open(BlockDriverState *bs);
+
+#if defined(__FreeBSD__)
+static int cd_open(BlockDriverState *bs);
+#endif
+
+static int raw_is_inserted(BlockDriverState *bs);
+
+static int raw_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd, open_flags, ret;
+
+    posix_aio_init();
+
+    s->lseek_err_cnt = 0;
+
+    open_flags = O_BINARY;
+    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
+        open_flags |= O_RDWR;
+    } else {
+        open_flags |= O_RDONLY;
+        bs->read_only = 1;
+    }
+    if (flags & BDRV_O_CREAT)
+        open_flags |= O_CREAT | O_TRUNC;
+
+    /* Use O_DSYNC for write-through caching, no flags for write-back caching,
+     * and O_DIRECT for no caching. */
+    if ((flags & BDRV_O_NOCACHE))
+        open_flags |= O_DIRECT;
+    else if (!(flags & BDRV_O_CACHE_WB))
+        open_flags |= O_DSYNC;
+
+    s->type = FTYPE_FILE;
+
+    fd = open(filename, open_flags, 0644);
+    if (fd < 0) {
+        ret = -errno;
+        if (ret == -EROFS)
+            ret = -EACCES;
+        return ret;
+    }
+    s->fd = fd;
+    s->aligned_buf = NULL;
+    if ((flags & BDRV_O_NOCACHE)) {
+        s->aligned_buf = qemu_blockalign(bs, ALIGNED_BUFFER_SIZE);
+        if (s->aligned_buf == NULL) {
+            ret = -errno;
+            close(fd);
+            return ret;
+        }
+    }
+    return 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
+        u_int32_t   blockSize = 512;
+        if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
+            bufsize = blockSize;
+        }
+#endif
+*/
+
+/*
+ * offset and count are in bytes, but must be multiples of 512 for files
+ * opened with O_DIRECT. buf must be aligned to 512 bytes then.
+ *
+ * This function may be called without alignment if the caller ensures
+ * that O_DIRECT is not in effect.
+ */
+static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
+                     uint8_t *buf, int count)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0)
+        return ret;
+
+    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
+        ++(s->lseek_err_cnt);
+        if(s->lseek_err_cnt <= 10) {
+            DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
+                              "] lseek failed : %d = %s\n",
+                              s->fd, bs->filename, offset, buf, count,
+                              bs->total_sectors, errno, strerror(errno));
+        }
+        return -1;
+    }
+    s->lseek_err_cnt=0;
+
+    ret = read(s->fd, buf, count);
+    if (ret == count)
+        goto label__raw_read__success;
+
+    DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
+                      "] read failed %d : %d = %s\n",
+                      s->fd, bs->filename, offset, buf, count,
+                      bs->total_sectors, ret, errno, strerror(errno));
+
+    /* Try harder for CDrom. */
+    if (bs->type == BDRV_TYPE_CDROM) {
+        lseek(s->fd, offset, SEEK_SET);
+        ret = read(s->fd, buf, count);
+        if (ret == count)
+            goto label__raw_read__success;
+        lseek(s->fd, offset, SEEK_SET);
+        ret = read(s->fd, buf, count);
+        if (ret == count)
+            goto label__raw_read__success;
+
+        DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
+                          "] retry read failed %d : %d = %s\n",
+                          s->fd, bs->filename, offset, buf, count,
+                          bs->total_sectors, ret, errno, strerror(errno));
+    }
+
+label__raw_read__success:
+
+    return ret;
+}
+
+/*
+ * offset and count are in bytes, but must be multiples of 512 for files
+ * opened with O_DIRECT. buf must be aligned to 512 bytes then.
+ *
+ * This function may be called without alignment if the caller ensures
+ * that O_DIRECT is not in effect.
+ */
+static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
+                      const uint8_t *buf, int count)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0)
+        return -errno;
+
+    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
+        ++(s->lseek_err_cnt);
+        if(s->lseek_err_cnt) {
+            DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
+                              PRId64 "] lseek failed : %d = %s\n",
+                              s->fd, bs->filename, offset, buf, count,
+                              bs->total_sectors, errno, strerror(errno));
+        }
+        return -EIO;
+    }
+    s->lseek_err_cnt = 0;
+
+    ret = write(s->fd, buf, count);
+    if (ret == count)
+        goto label__raw_write__success;
+
+    DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
+                      "] write failed %d : %d = %s\n",
+                      s->fd, bs->filename, offset, buf, count,
+                      bs->total_sectors, ret, errno, strerror(errno));
+
+label__raw_write__success:
+
+    return  (ret < 0) ? -errno : ret;
+}
+
+
+/*
+ * offset and count are in bytes and possibly not aligned. For files opened
+ * with O_DIRECT, necessary alignments are ensured before calling
+ * raw_pread_aligned to do the actual read.
+ */
+static int raw_pread(BlockDriverState *bs, int64_t offset,
+                     uint8_t *buf, int count)
+{
+    BDRVRawState *s = bs->opaque;
+    int size, ret, shift, sum;
+
+    sum = 0;
+
+    if (s->aligned_buf != NULL)  {
+
+        if (offset & 0x1ff) {
+            /* align offset on a 512 bytes boundary */
+
+            shift = offset & 0x1ff;
+            size = (shift + count + 0x1ff) & ~0x1ff;
+            if (size > ALIGNED_BUFFER_SIZE)
+                size = ALIGNED_BUFFER_SIZE;
+            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
+            if (ret < 0)
+                return ret;
+
+            size = 512 - shift;
+            if (size > count)
+                size = count;
+            memcpy(buf, s->aligned_buf + shift, size);
+
+            buf += size;
+            offset += size;
+            count -= size;
+            sum += size;
+
+            if (count == 0)
+                return sum;
+        }
+        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
+
+            /* read on aligned buffer */
+
+            while (count) {
+
+                size = (count + 0x1ff) & ~0x1ff;
+                if (size > ALIGNED_BUFFER_SIZE)
+                    size = ALIGNED_BUFFER_SIZE;
+
+                ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
+                if (ret < 0)
+                    return ret;
+
+                size = ret;
+                if (size > count)
+                    size = count;
+
+                memcpy(buf, s->aligned_buf, size);
+
+                buf += size;
+                offset += size;
+                count -= size;
+                sum += size;
+            }
+
+            return sum;
+        }
+    }
+
+    return raw_pread_aligned(bs, offset, buf, count) + sum;
+}
+
+static int raw_read(BlockDriverState *bs, int64_t sector_num,
+                    uint8_t *buf, int nb_sectors)
+{
+    int ret;
+
+    ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
+    if (ret == (nb_sectors * 512))
+        ret = 0;
+    return ret;
+}
+
+/*
+ * offset and count are in bytes and possibly not aligned. For files opened
+ * with O_DIRECT, necessary alignments are ensured before calling
+ * raw_pwrite_aligned to do the actual write.
+ */
+static int raw_pwrite(BlockDriverState *bs, int64_t offset,
+                      const uint8_t *buf, int count)
+{
+    BDRVRawState *s = bs->opaque;
+    int size, ret, shift, sum;
+
+    sum = 0;
+
+    if (s->aligned_buf != NULL) {
+
+        if (offset & 0x1ff) {
+            /* align offset on a 512 bytes boundary */
+            shift = offset & 0x1ff;
+            ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
+            if (ret < 0)
+                return ret;
+
+            size = 512 - shift;
+            if (size > count)
+                size = count;
+            memcpy(s->aligned_buf + shift, buf, size);
+
+            ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
+            if (ret < 0)
+                return ret;
+
+            buf += size;
+            offset += size;
+            count -= size;
+            sum += size;
+
+            if (count == 0)
+                return sum;
+        }
+        if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
+
+            while ((size = (count & ~0x1ff)) != 0) {
+
+                if (size > ALIGNED_BUFFER_SIZE)
+                    size = ALIGNED_BUFFER_SIZE;
+
+                memcpy(s->aligned_buf, buf, size);
+
+                ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
+                if (ret < 0)
+                    return ret;
+
+                buf += ret;
+                offset += ret;
+                count -= ret;
+                sum += ret;
+            }
+            /* here, count < 512 because (count & ~0x1ff) == 0 */
+            if (count) {
+                ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
+                if (ret < 0)
+                    return ret;
+                 memcpy(s->aligned_buf, buf, count);
+
+                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
+                 if (ret < 0)
+                     return ret;
+                 if (count < ret)
+                     ret = count;
+
+                 sum += ret;
+            }
+            return sum;
+        }
+    }
+    return raw_pwrite_aligned(bs, offset, buf, count) + sum;
+}
+
+static int raw_write(BlockDriverState *bs, int64_t sector_num,
+                     const uint8_t *buf, int nb_sectors)
+{
+    int ret;
+    ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
+    if (ret == (nb_sectors * 512))
+        ret = 0;
+    return ret;
+}
+
+#ifdef CONFIG_AIO
+/***********************************************************/
+/* Unix AIO using POSIX AIO */
+
+typedef struct RawAIOCB {
+    BlockDriverAIOCB common;
+    struct qemu_paiocb aiocb;
+    struct RawAIOCB *next;
+    int ret;
+} RawAIOCB;
+
+typedef struct PosixAioState
+{
+    int rfd, wfd;
+    RawAIOCB *first_aio;
+} PosixAioState;
+
+static void posix_aio_read(void *opaque)
+{
+    PosixAioState *s = opaque;
+    RawAIOCB *acb, **pacb;
+    int ret;
+    ssize_t len;
+
+    /* read all bytes from signal pipe */
+    for (;;) {
+        char bytes[16];
+
+        len = read(s->rfd, bytes, sizeof(bytes));
+        if (len == -1 && errno == EINTR)
+            continue; /* try again */
+        if (len == sizeof(bytes))
+            continue; /* more to read */
+        break;
+    }
+
+    for(;;) {
+        pacb = &s->first_aio;
+        for(;;) {
+            acb = *pacb;
+            if (!acb)
+                goto the_end;
+            ret = qemu_paio_error(&acb->aiocb);
+            if (ret == ECANCELED) {
+                /* remove the request */
+                *pacb = acb->next;
+                qemu_aio_release(acb);
+            } else if (ret != EINPROGRESS) {
+                /* end of aio */
+                if (ret == 0) {
+                    ret = qemu_paio_return(&acb->aiocb);
+                    if (ret == acb->aiocb.aio_nbytes)
+                        ret = 0;
+                    else
+                        ret = -EINVAL;
+                } else {
+                    ret = -ret;
+                }
+                /* remove the request */
+                *pacb = acb->next;
+                /* call the callback */
+                acb->common.cb(acb->common.opaque, ret);
+                qemu_aio_release(acb);
+                break;
+            } else {
+                pacb = &acb->next;
+            }
+        }
+    }
+ the_end: ;
+}
+
+static int posix_aio_flush(void *opaque)
+{
+    PosixAioState *s = opaque;
+    return !!s->first_aio;
+}
+
+static PosixAioState *posix_aio_state;
+
+static void aio_signal_handler(int signum)
+{
+    if (posix_aio_state) {
+        char byte = 0;
+
+        write(posix_aio_state->wfd, &byte, sizeof(byte));
+    }
+
+    qemu_service_io();
+}
+
+static int posix_aio_init(void)
+{
+    struct sigaction act;
+    PosixAioState *s;
+    int fds[2];
+    struct qemu_paioinit ai;
+  
+    if (posix_aio_state)
+        return 0;
+
+    s = qemu_malloc(sizeof(PosixAioState));
+
+    sigfillset(&act.sa_mask);
+    act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
+    act.sa_handler = aio_signal_handler;
+    sigaction(SIGUSR2, &act, NULL);
+
+    s->first_aio = NULL;
+    if (pipe(fds) == -1) {
+        fprintf(stderr, "failed to create pipe\n");
+        return -errno;
+    }
+
+    s->rfd = fds[0];
+    s->wfd = fds[1];
+
+    fcntl(s->rfd, F_SETFL, O_NONBLOCK);
+    fcntl(s->wfd, F_SETFL, O_NONBLOCK);
+
+    qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, s);
+
+    memset(&ai, 0, sizeof(ai));
+    ai.aio_threads = 64;
+    ai.aio_num = 64;
+    qemu_paio_init(&ai);
+
+    posix_aio_state = s;
+
+    return 0;
+}
+
+static RawAIOCB *raw_aio_setup(BlockDriverState *bs, int64_t sector_num,
+        QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVRawState *s = bs->opaque;
+    RawAIOCB *acb;
+
+    if (fd_open(bs) < 0)
+        return NULL;
+
+    acb = qemu_aio_get(bs, cb, opaque);
+    if (!acb)
+        return NULL;
+    acb->aiocb.aio_fildes = s->fd;
+    acb->aiocb.ev_signo = SIGUSR2;
+    acb->aiocb.aio_iov = qiov->iov;
+    acb->aiocb.aio_niov = qiov->niov;
+    acb->aiocb.aio_nbytes = nb_sectors * 512;
+    acb->aiocb.aio_offset = sector_num * 512;
+    acb->aiocb.aio_flags = 0;
+
+    /*
+     * If O_DIRECT is used the buffer needs to be aligned on a sector
+     * boundary. Tell the low level code to ensure that in case it's
+     * not done yet.
+     */
+    if (s->aligned_buf)
+        acb->aiocb.aio_flags |= QEMU_AIO_SECTOR_ALIGNED;
+
+    acb->next = posix_aio_state->first_aio;
+    posix_aio_state->first_aio = acb;
+    return acb;
+}
+
+static void raw_aio_remove(RawAIOCB *acb)
+{
+    RawAIOCB **pacb;
+
+    /* remove the callback from the queue */
+    pacb = &posix_aio_state->first_aio;
+    for(;;) {
+        if (*pacb == NULL) {
+            fprintf(stderr, "raw_aio_remove: aio request not found!\n");
+            break;
+        } else if (*pacb == acb) {
+            *pacb = acb->next;
+            qemu_aio_release(acb);
+            break;
+        }
+        pacb = &(*pacb)->next;
+    }
+}
+
+static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    RawAIOCB *acb;
+
+    acb = raw_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque);
+    if (!acb)
+        return NULL;
+    if (qemu_paio_read(&acb->aiocb) < 0) {
+        raw_aio_remove(acb);
+        return NULL;
+    }
+    return &acb->common;
+}
+
+static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
+        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    RawAIOCB *acb;
+
+    acb = raw_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque);
+    if (!acb)
+        return NULL;
+    if (qemu_paio_write(&acb->aiocb) < 0) {
+        raw_aio_remove(acb);
+        return NULL;
+    }
+    return &acb->common;
+}
+
+static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
+{
+    int ret;
+    RawAIOCB *acb = (RawAIOCB *)blockacb;
+
+    ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
+    if (ret == QEMU_PAIO_NOTCANCELED) {
+        /* fail safe: if the aio could not be canceled, we wait for
+           it */
+        while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
+    }
+
+    raw_aio_remove(acb);
+}
+#else /* CONFIG_AIO */
+static int posix_aio_init(void)
+{
+    return 0;
+}
+#endif /* CONFIG_AIO */
+
+
+static void raw_close(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    if (s->fd >= 0) {
+        close(s->fd);
+        s->fd = -1;
+        if (s->aligned_buf != NULL)
+            qemu_free(s->aligned_buf);
+    }
+}
+
+static int raw_truncate(BlockDriverState *bs, int64_t offset)
+{
+    BDRVRawState *s = bs->opaque;
+    if (s->type != FTYPE_FILE)
+        return -ENOTSUP;
+    if (ftruncate(s->fd, offset) < 0)
+        return -errno;
+    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;
+}
+#else /* !__OpenBSD__ */
+static int64_t  raw_getlength(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd = s->fd;
+    int64_t size;
+#ifdef HOST_BSD
+    struct stat sb;
+#ifdef __FreeBSD__
+    int reopened = 0;
+#endif
+#endif
+#ifdef __sun__
+    struct dk_minfo minfo;
+    int rv;
+#endif
+    int ret;
+
+    ret = fd_open(bs);
+    if (ret < 0)
+        return ret;
+
+#ifdef HOST_BSD
+#ifdef __FreeBSD__
+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
+#ifdef CONFIG_COCOA
+        size = LONG_LONG_MAX;
+#else
+        size = lseek(fd, 0LL, SEEK_END);
+#endif
+#ifdef __FreeBSD__
+        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 && cd_open(bs) >= 0) {
+                reopened = 1;
+                goto again;
+            }
+        }
+#endif
+    } else
+#endif
+#ifdef __sun__
+    /*
+     * use the DKIOCGMEDIAINFO ioctl to read the size.
+     */
+    rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
+    if ( rv != -1 ) {
+        size = minfo.dki_lbsize * minfo.dki_capacity;
+    } else /* there are reports that lseek on some devices
+              fails, but irc discussion said that contingency
+              on contingency was overkill */
+#endif
+    {
+        size = lseek(fd, 0, SEEK_END);
+    }
+    return size;
+}
+#endif
+
+static int raw_create(const char *filename, int64_t total_size,
+                      const char *backing_file, int flags)
+{
+    int fd;
+
+    if (flags || backing_file)
+        return -ENOTSUP;
+
+    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+              0644);
+    if (fd < 0)
+        return -EIO;
+    ftruncate(fd, total_size * 512);
+    close(fd);
+    return 0;
+}
+
+static void raw_flush(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    fsync(s->fd);
+}
+
+static BlockDriver bdrv_raw = {
+    .format_name = "raw",
+    .instance_size = sizeof(BDRVRawState),
+    .bdrv_probe = NULL, /* no probe for protocols */
+    .bdrv_open = raw_open,
+    .bdrv_read = raw_read,
+    .bdrv_write = raw_write,
+    .bdrv_close = raw_close,
+    .bdrv_create = raw_create,
+    .bdrv_flush = raw_flush,
+
+#ifdef CONFIG_AIO
+    .bdrv_aio_readv = raw_aio_readv,
+    .bdrv_aio_writev = raw_aio_writev,
+    .bdrv_aio_cancel = raw_aio_cancel,
+    .aiocb_size = sizeof(RawAIOCB),
+#endif
+
+    .bdrv_truncate = raw_truncate,
+    .bdrv_getlength = raw_getlength,
+};
+
+/***********************************************/
+/* host device */
+
+#ifdef CONFIG_COCOA
+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_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVRawState *s = bs->opaque;
+    int fd, open_flags, ret;
+
+    posix_aio_init();
+
+#ifdef CONFIG_COCOA
+    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 = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
+            if (fd < 0) {
+                bsdPath[strlen(bsdPath)-1] = '1';
+            } else {
+                close(fd);
+            }
+            filename = bsdPath;
+        }
+
+        if ( mediaIterator )
+            IOObjectRelease( mediaIterator );
+    }
+#endif
+    open_flags = O_BINARY;
+    if ((flags & BDRV_O_ACCESS) == O_RDWR) {
+        open_flags |= O_RDWR;
+    } else {
+        open_flags |= O_RDONLY;
+        bs->read_only = 1;
+    }
+    /* Use O_DSYNC for write-through caching, no flags for write-back caching,
+     * and O_DIRECT for no caching. */
+    if ((flags & BDRV_O_NOCACHE))
+        open_flags |= O_DIRECT;
+    else if (!(flags & BDRV_O_CACHE_WB))
+        open_flags |= O_DSYNC;
+
+    s->type = FTYPE_FILE;
+#if defined(__linux__)
+    if (strstart(filename, "/dev/cd", NULL)) {
+        /* open will not fail even if no CD is inserted */
+        open_flags |= O_NONBLOCK;
+        s->type = FTYPE_CD;
+    } else if (strstart(filename, "/dev/fd", NULL)) {
+        s->type = FTYPE_FD;
+        s->fd_open_flags = open_flags;
+        /* open will not fail even if no floppy is inserted */
+        open_flags |= O_NONBLOCK;
+#ifdef CONFIG_AIO
+    } else if (strstart(filename, "/dev/sg", NULL)) {
+        bs->sg = 1;
+#endif
+    }
+#endif
+#if defined(__FreeBSD__)
+    if (strstart(filename, "/dev/cd", NULL) ||
+        strstart(filename, "/dev/acd", NULL)) {
+        s->type = FTYPE_CD;
+        s->cd_open_flags = open_flags;
+    }
+#endif
+    s->fd = -1;
+    fd = open(filename, open_flags, 0644);
+    if (fd < 0) {
+        ret = -errno;
+        if (ret == -EROFS)
+            ret = -EACCES;
+        return ret;
+    }
+    s->fd = fd;
+#if defined(__FreeBSD__)
+    /* make sure the door isnt locked at this time */
+    if (s->type == FTYPE_CD)
+        ioctl (s->fd, CDIOCALLOW);
+#endif
+#if defined(__linux__)
+    /* close fd so that we can reopen it as needed */
+    if (s->type == FTYPE_FD) {
+        close(s->fd);
+        s->fd = -1;
+        s->fd_media_changed = 1;
+    }
+#endif
+    return 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 &&
+        (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
+        close(s->fd);
+        s->fd = -1;
+#ifdef DEBUG_FLOPPY
+        printf("Floppy closed\n");
+#endif
+    }
+    if (s->fd < 0) {
+        if (s->fd_got_error &&
+            (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
+#ifdef DEBUG_FLOPPY
+            printf("No floppy (open delayed)\n");
+#endif
+            return -EIO;
+        }
+        s->fd = open(bs->filename, s->fd_open_flags);
+        if (s->fd < 0) {
+            s->fd_error_time = qemu_get_clock(rt_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 = qemu_get_clock(rt_clock);
+    s->fd_got_error = 0;
+    return 0;
+}
+
+static int raw_is_inserted(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+    int ret;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+        if (ret == CDS_DISC_OK)
+            return 1;
+        else
+            return 0;
+        break;
+    case FTYPE_FD:
+        ret = fd_open(bs);
+        return (ret >= 0);
+    default:
+        return 1;
+    }
+}
+
+/* currently only used by fdc.c, but a CD version would be good too */
+static int raw_media_changed(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_FD:
+        {
+            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;
+        }
+    default:
+        return -ENOTSUP;
+    }
+}
+
+static int raw_eject(BlockDriverState *bs, int eject_flag)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        if (eject_flag) {
+            if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
+                perror("CDROMEJECT");
+        } else {
+            if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
+                perror("CDROMEJECT");
+        }
+        break;
+    case FTYPE_FD:
+        {
+            int fd;
+            if (s->fd >= 0) {
+                close(s->fd);
+                s->fd = -1;
+            }
+            fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
+            if (fd >= 0) {
+                if (ioctl(fd, FDEJECT, 0) < 0)
+                    perror("FDEJECT");
+                close(fd);
+            }
+        }
+        break;
+    default:
+        return -ENOTSUP;
+    }
+    return 0;
+}
+
+static int raw_set_locked(BlockDriverState *bs, int locked)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
+            /* Note: an error can happen if the distribution automatically
+               mounts the CD-ROM */
+            //        perror("CDROM_LOCKDOOR");
+        }
+        break;
+    default:
+        return -ENOTSUP;
+    }
+    return 0;
+}
+
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    BDRVRawState *s = bs->opaque;
+
+    return ioctl(s->fd, req, buf);
+}
+
+#ifdef CONFIG_AIO
+static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
+        unsigned long int req, void *buf,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVRawState *s = bs->opaque;
+    RawAIOCB *acb;
+
+    if (fd_open(bs) < 0)
+        return NULL;
+
+    acb = qemu_aio_get(bs, cb, opaque);
+    if (!acb)
+        return NULL;
+    acb->aiocb.aio_fildes = s->fd;
+    acb->aiocb.ev_signo = SIGUSR2;
+    acb->aiocb.aio_offset = 0;
+    acb->aiocb.aio_flags = 0;
+
+    acb->next = posix_aio_state->first_aio;
+    posix_aio_state->first_aio = acb;
+
+    acb->aiocb.aio_ioctl_buf = buf;
+    acb->aiocb.aio_ioctl_cmd = req;
+    if (qemu_paio_ioctl(&acb->aiocb) < 0) {
+        raw_aio_remove(acb);
+        return NULL;
+    }
+
+    return &acb->common;
+}
+#endif
+
+#elif defined(__FreeBSD__)
+
+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 int cd_open(BlockDriverState *bs)
+{
+#if defined(__FreeBSD__)
+    BDRVRawState *s = bs->opaque;
+    int fd;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        /* XXX force reread of possibly changed/newly loaded disc,
+         * FreeBSD seems to not notice sometimes... */
+        if (s->fd >= 0)
+            close (s->fd);
+        fd = open(bs->filename, s->cd_open_flags, 0644);
+        if (fd < 0) {
+            s->fd = -1;
+            return -EIO;
+        }
+        s->fd = fd;
+        /* make sure the door isnt locked at this time */
+        ioctl (s->fd, CDIOCALLOW);
+    }
+#endif
+    return 0;
+}
+
+static int raw_is_inserted(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        return (raw_getlength(bs) > 0);
+    case FTYPE_FD:
+        /* XXX handle this */
+        /* FALLTHRU */
+    default:
+        return 1;
+    }
+}
+
+static int raw_media_changed(BlockDriverState *bs)
+{
+    return -ENOTSUP;
+}
+
+static int raw_eject(BlockDriverState *bs, int eject_flag)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        if (s->fd < 0)
+            return -ENOTSUP;
+        (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");
+        }
+        if (cd_open(bs) < 0)
+            return -ENOTSUP;
+        break;
+    case FTYPE_FD:
+        /* XXX handle this */
+        /* FALLTHRU */
+    default:
+        return -ENOTSUP;
+    }
+    return 0;
+}
+
+static int raw_set_locked(BlockDriverState *bs, int locked)
+{
+    BDRVRawState *s = bs->opaque;
+
+    switch(s->type) {
+    case FTYPE_CD:
+        if (s->fd < 0)
+            return -ENOTSUP;
+        if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
+            /* Note: an error can happen if the distribution automatically
+               mounts the CD-ROM */
+            //        perror("CDROM_LOCKDOOR");
+        }
+        break;
+    default:
+        return -ENOTSUP;
+    }
+    return 0;
+}
+
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    return -ENOTSUP;
+}
+#else /* !linux && !FreeBSD */
+
+static int fd_open(BlockDriverState *bs)
+{
+    return 0;
+}
+
+static int raw_is_inserted(BlockDriverState *bs)
+{
+    return 1;
+}
+
+static int raw_media_changed(BlockDriverState *bs)
+{
+    return -ENOTSUP;
+}
+
+static int raw_eject(BlockDriverState *bs, int eject_flag)
+{
+    return -ENOTSUP;
+}
+
+static int raw_set_locked(BlockDriverState *bs, int locked)
+{
+    return -ENOTSUP;
+}
+
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    return -ENOTSUP;
+}
+
+static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
+        unsigned long int req, void *buf,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    return NULL;
+}
+#endif /* !linux && !FreeBSD */
+
+#if defined(__linux__) || defined(__FreeBSD__)
+static int hdev_create(const char *filename, int64_t total_size,
+                       const char *backing_file, int flags)
+{
+    int fd;
+    int ret = 0;
+    struct stat stat_buf;
+
+    if (flags || backing_file)
+        return -ENOTSUP;
+
+    fd = open(filename, O_WRONLY | O_BINARY);
+    if (fd < 0)
+        return -EIO;
+
+    if (fstat(fd, &stat_buf) < 0)
+        ret = -EIO;
+    else if (!S_ISBLK(stat_buf.st_mode))
+        ret = -EIO;
+    else if (lseek(fd, 0, SEEK_END) < total_size * 512)
+        ret = -ENOSPC;
+
+    close(fd);
+    return ret;
+}
+
+#else  /* !(linux || freebsd) */
+
+static int hdev_create(const char *filename, int64_t total_size,
+                       const char *backing_file, int flags)
+{
+    return -ENOTSUP;
+}
+#endif
+
+static BlockDriver bdrv_host_device = {
+    .format_name	= "host_device",
+    .instance_size	= sizeof(BDRVRawState),
+    .bdrv_open		= hdev_open,
+    .bdrv_close		= raw_close,
+    .bdrv_create        = hdev_create,
+    .bdrv_flush		= raw_flush,
+
+#ifdef CONFIG_AIO
+    .bdrv_aio_readv	= raw_aio_readv,
+    .bdrv_aio_writev	= raw_aio_writev,
+    .bdrv_aio_cancel	= raw_aio_cancel,
+    .aiocb_size		= sizeof(RawAIOCB),
+#endif
+
+    .bdrv_read          = raw_read,
+    .bdrv_write         = raw_write,
+    .bdrv_getlength	= raw_getlength,
+
+    /* removable device support */
+    .bdrv_is_inserted	= raw_is_inserted,
+    .bdrv_media_changed	= raw_media_changed,
+    .bdrv_eject		= raw_eject,
+    .bdrv_set_locked	= raw_set_locked,
+    /* generic scsi device */
+    .bdrv_ioctl		= raw_ioctl,
+#ifdef CONFIG_AIO
+    .bdrv_aio_ioctl	= raw_aio_ioctl,
+#endif
+};
+
+static void bdrv_raw_init(void)
+{
+    bdrv_register(&bdrv_raw);
+    bdrv_register(&bdrv_host_device);
+}
+
+block_init(bdrv_raw_init);