block.c 43.3 KB
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/*
 * QEMU System Emulator block driver
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 *
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 * Copyright (c) 2003 Fabrice Bellard
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 *
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 * 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.
 */
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#include "config-host.h"
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#ifdef HOST_BSD
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/* include native header before sys-queue.h */
#include <sys/queue.h>
#endif

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#include "qemu-common.h"
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#include "monitor.h"
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#include "block_int.h"
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#ifdef HOST_BSD
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
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#ifndef __DragonFly__
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#include <sys/disk.h>
#endif
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#endif
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#ifdef _WIN32
#include <windows.h>
#endif

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#define SECTOR_BITS 9
#define SECTOR_SIZE (1 << SECTOR_BITS)

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typedef struct BlockDriverAIOCBSync {
    BlockDriverAIOCB common;
    QEMUBH *bh;
    int ret;
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    /* vector translation state */
    QEMUIOVector *qiov;
    uint8_t *bounce;
    int is_write;
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} BlockDriverAIOCBSync;

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static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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        BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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        BlockDriverCompletionFunc *cb, void *opaque);
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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
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                        uint8_t *buf, int nb_sectors);
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors);
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BlockDriverState *bdrv_first;

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static BlockDriver *first_drv;

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int path_is_absolute(const char *path)
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{
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    const char *p;
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#ifdef _WIN32
    /* specific case for names like: "\\.\d:" */
    if (*path == '/' || *path == '\\')
        return 1;
#endif
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    p = strchr(path, ':');
    if (p)
        p++;
    else
        p = path;
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#ifdef _WIN32
    return (*p == '/' || *p == '\\');
#else
    return (*p == '/');
#endif
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}

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/* if filename is absolute, just copy it to dest. Otherwise, build a
   path to it by considering it is relative to base_path. URL are
   supported. */
void path_combine(char *dest, int dest_size,
                  const char *base_path,
                  const char *filename)
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{
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    const char *p, *p1;
    int len;

    if (dest_size <= 0)
        return;
    if (path_is_absolute(filename)) {
        pstrcpy(dest, dest_size, filename);
    } else {
        p = strchr(base_path, ':');
        if (p)
            p++;
        else
            p = base_path;
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        p1 = strrchr(base_path, '/');
#ifdef _WIN32
        {
            const char *p2;
            p2 = strrchr(base_path, '\\');
            if (!p1 || p2 > p1)
                p1 = p2;
        }
#endif
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        if (p1)
            p1++;
        else
            p1 = base_path;
        if (p1 > p)
            p = p1;
        len = p - base_path;
        if (len > dest_size - 1)
            len = dest_size - 1;
        memcpy(dest, base_path, len);
        dest[len] = '\0';
        pstrcat(dest, dest_size, filename);
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    }
}


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static void bdrv_register(BlockDriver *bdrv)
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{
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    if (!bdrv->bdrv_aio_readv) {
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        /* add AIO emulation layer */
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        bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
        bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
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        bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
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        bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
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    } else if (!bdrv->bdrv_read) {
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        /* add synchronous IO emulation layer */
        bdrv->bdrv_read = bdrv_read_em;
        bdrv->bdrv_write = bdrv_write_em;
    }
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    aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel);
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    bdrv->next = first_drv;
    first_drv = bdrv;
}
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/* create a new block device (by default it is empty) */
BlockDriverState *bdrv_new(const char *device_name)
{
    BlockDriverState **pbs, *bs;

    bs = qemu_mallocz(sizeof(BlockDriverState));
    pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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    if (device_name[0] != '\0') {
        /* insert at the end */
        pbs = &bdrv_first;
        while (*pbs != NULL)
            pbs = &(*pbs)->next;
        *pbs = bs;
    }
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    return bs;
}

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BlockDriver *bdrv_find_format(const char *format_name)
{
    BlockDriver *drv1;
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
        if (!strcmp(drv1->format_name, format_name))
            return drv1;
    }
    return NULL;
}

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int bdrv_create2(BlockDriver *drv,
                const char *filename, int64_t size_in_sectors,
                const char *backing_file, const char *backing_format,
                int flags)
{
    if (drv->bdrv_create2)
        return drv->bdrv_create2(filename, size_in_sectors, backing_file,
                                 backing_format, flags);
    if (drv->bdrv_create)
        return drv->bdrv_create(filename, size_in_sectors, backing_file,
                                flags);
    return -ENOTSUP;
}

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int bdrv_create(BlockDriver *drv,
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                const char *filename, int64_t size_in_sectors,
                const char *backing_file, int flags)
{
    if (!drv->bdrv_create)
        return -ENOTSUP;
    return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
}

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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size)
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{
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    char temp_dir[MAX_PATH];
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    GetTempPath(MAX_PATH, temp_dir);
    GetTempFileName(temp_dir, "qem", 0, filename);
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}
#else
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void get_tmp_filename(char *filename, int size)
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{
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    int fd;
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    const char *tmpdir;
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    /* XXX: race condition possible */
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    tmpdir = getenv("TMPDIR");
    if (!tmpdir)
        tmpdir = "/tmp";
    snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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    fd = mkstemp(filename);
    close(fd);
}
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#endif
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#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename)
{
    return (((filename[0] >= 'a' && filename[0] <= 'z') ||
             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
            filename[1] == ':');
}
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static int is_windows_drive(const char *filename)
{
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    if (is_windows_drive_prefix(filename) &&
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        filename[2] == '\0')
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        return 1;
    if (strstart(filename, "\\\\.\\", NULL) ||
        strstart(filename, "//./", NULL))
        return 1;
    return 0;
}
#endif

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static BlockDriver *find_protocol(const char *filename)
{
    BlockDriver *drv1;
    char protocol[128];
    int len;
    const char *p;
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#ifdef _WIN32
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    if (is_windows_drive(filename) ||
        is_windows_drive_prefix(filename))
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        return &bdrv_raw;
#endif
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    p = strchr(filename, ':');
    if (!p)
        return &bdrv_raw;
    len = p - filename;
    if (len > sizeof(protocol) - 1)
        len = sizeof(protocol) - 1;
    memcpy(protocol, filename, len);
    protocol[len] = '\0';
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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        if (drv1->protocol_name &&
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            !strcmp(drv1->protocol_name, protocol))
            return drv1;
    }
    return NULL;
}

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/* XXX: force raw format if block or character device ? It would
   simplify the BSD case */
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static BlockDriver *find_image_format(const char *filename)
{
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    int ret, score, score_max;
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    BlockDriver *drv1, *drv;
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    uint8_t buf[2048];
    BlockDriverState *bs;
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    /* detect host devices. By convention, /dev/cdrom[N] is always
       recognized as a host CDROM */
    if (strstart(filename, "/dev/cdrom", NULL))
        return &bdrv_host_device;
#ifdef _WIN32
    if (is_windows_drive(filename))
        return &bdrv_host_device;
#else
    {
        struct stat st;
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        if (stat(filename, &st) >= 0 &&
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            (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
            return &bdrv_host_device;
        }
    }
#endif
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    drv = find_protocol(filename);
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    /* no need to test disk image formats for vvfat */
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    if (drv == &bdrv_vvfat)
        return drv;
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    ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
    if (ret < 0)
        return NULL;
    ret = bdrv_pread(bs, 0, buf, sizeof(buf));
    bdrv_delete(bs);
    if (ret < 0) {
        return NULL;
    }

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    score_max = 0;
    for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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        if (drv1->bdrv_probe) {
            score = drv1->bdrv_probe(buf, ret, filename);
            if (score > score_max) {
                score_max = score;
                drv = drv1;
            }
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        }
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    }
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    return drv;
}

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int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
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{
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    BlockDriverState *bs;
    int ret;

    bs = bdrv_new("");
    ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
    if (ret < 0) {
        bdrv_delete(bs);
        return ret;
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    }
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    bs->growable = 1;
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    *pbs = bs;
    return 0;
}

int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
{
    return bdrv_open2(bs, filename, flags, NULL);
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}

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int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
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               BlockDriver *drv)
{
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    int ret, open_flags;
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    char tmp_filename[PATH_MAX];
    char backing_filename[PATH_MAX];
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    bs->read_only = 0;
    bs->is_temporary = 0;
    bs->encrypted = 0;
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    bs->valid_key = 0;
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    if (flags & BDRV_O_SNAPSHOT) {
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        BlockDriverState *bs1;
        int64_t total_size;
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        int is_protocol = 0;
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        /* if snapshot, we create a temporary backing file and open it
           instead of opening 'filename' directly */
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        /* if there is a backing file, use it */
        bs1 = bdrv_new("");
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        ret = bdrv_open2(bs1, filename, 0, drv);
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        if (ret < 0) {
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            bdrv_delete(bs1);
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            return ret;
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        }
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        total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
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        if (bs1->drv && bs1->drv->protocol_name)
            is_protocol = 1;

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        bdrv_delete(bs1);
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        get_tmp_filename(tmp_filename, sizeof(tmp_filename));
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        /* Real path is meaningless for protocols */
        if (is_protocol)
            snprintf(backing_filename, sizeof(backing_filename),
                     "%s", filename);
        else
            realpath(filename, backing_filename);

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        ret = bdrv_create2(&bdrv_qcow2, tmp_filename,
                           total_size, backing_filename, 
                           (drv ? drv->format_name : NULL), 0);
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        if (ret < 0) {
            return ret;
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        }
        filename = tmp_filename;
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        drv = &bdrv_qcow2;
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        bs->is_temporary = 1;
    }
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    pstrcpy(bs->filename, sizeof(bs->filename), filename);
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    if (flags & BDRV_O_FILE) {
        drv = find_protocol(filename);
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    } else if (!drv) {
        drv = find_image_format(filename);
    }
    if (!drv) {
        ret = -ENOENT;
        goto unlink_and_fail;
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    }
    bs->drv = drv;
    bs->opaque = qemu_mallocz(drv->instance_size);
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    /* Note: for compatibility, we open disk image files as RDWR, and
       RDONLY as fallback */
    if (!(flags & BDRV_O_FILE))
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        open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
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    else
        open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
    ret = drv->bdrv_open(bs, filename, open_flags);
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    if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
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        ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
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        bs->read_only = 1;
    }
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    if (ret < 0) {
        qemu_free(bs->opaque);
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        bs->opaque = NULL;
        bs->drv = NULL;
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    unlink_and_fail:
        if (bs->is_temporary)
            unlink(filename);
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        return ret;
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    }
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    if (drv->bdrv_getlength) {
        bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    }
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#ifndef _WIN32
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    if (bs->is_temporary) {
        unlink(filename);
    }
#endif
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    if (bs->backing_file[0] != '\0') {
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        /* if there is a backing file, use it */
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        BlockDriver *back_drv = NULL;
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        bs->backing_hd = bdrv_new("");
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        path_combine(backing_filename, sizeof(backing_filename),
                     filename, bs->backing_file);
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        if (bs->backing_format[0] != '\0')
            back_drv = bdrv_find_format(bs->backing_format);
        ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
                         back_drv);
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        if (ret < 0) {
            bdrv_close(bs);
            return ret;
        }
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    }

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    if (!bdrv_key_required(bs)) {
        /* call the change callback */
        bs->media_changed = 1;
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
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    return 0;
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}

void bdrv_close(BlockDriverState *bs)
{
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    if (bs->drv) {
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        if (bs->backing_hd)
            bdrv_delete(bs->backing_hd);
        bs->drv->bdrv_close(bs);
        qemu_free(bs->opaque);
#ifdef _WIN32
        if (bs->is_temporary) {
            unlink(bs->filename);
        }
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#endif
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        bs->opaque = NULL;
        bs->drv = NULL;
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        /* call the change callback */
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        bs->media_changed = 1;
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        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
}

void bdrv_delete(BlockDriverState *bs)
{
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    BlockDriverState **pbs;

    pbs = &bdrv_first;
    while (*pbs != bs && *pbs != NULL)
        pbs = &(*pbs)->next;
    if (*pbs == bs)
        *pbs = bs->next;

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    bdrv_close(bs);
    qemu_free(bs);
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}

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/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
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    BlockDriver *drv = bs->drv;
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    int64_t i, total_sectors;
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    int n, j;
    unsigned char sector[512];
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    if (!drv)
        return -ENOMEDIUM;
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    if (bs->read_only) {
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	return -EACCES;
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    }

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    if (!bs->backing_hd) {
	return -ENOTSUP;
    }
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    total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
    for (i = 0; i < total_sectors;) {
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        if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
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            for(j = 0; j < n; j++) {
                if (bdrv_read(bs, i, sector, 1) != 0) {
                    return -EIO;
                }

                if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
                    return -EIO;
                }
                i++;
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	    }
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	} else {
            i += n;
        }
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    }
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    if (drv->bdrv_make_empty)
	return drv->bdrv_make_empty(bs);
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    return 0;
}

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static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
                                   size_t size)
{
    int64_t len;

    if (!bdrv_is_inserted(bs))
        return -ENOMEDIUM;

    if (bs->growable)
        return 0;

    len = bdrv_getlength(bs);

    if ((offset + size) > len)
        return -EIO;

    return 0;
}

static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
                              int nb_sectors)
{
574
    return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
575 576
}

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/* return < 0 if error. See bdrv_write() for the return codes */
578
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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              uint8_t *buf, int nb_sectors)
{
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    BlockDriver *drv = bs->drv;

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    if (!drv)
        return -ENOMEDIUM;
585 586
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return -EIO;
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588
    return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
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}

591
/* Return < 0 if error. Important errors are:
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  -EIO         generic I/O error (may happen for all errors)
  -ENOMEDIUM   No media inserted.
  -EINVAL      Invalid sector number or nb_sectors
  -EACCES      Trying to write a read-only device
*/
597
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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               const uint8_t *buf, int nb_sectors)
{
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    BlockDriver *drv = bs->drv;
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    if (!bs->drv)
        return -ENOMEDIUM;
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    if (bs->read_only)
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        return -EACCES;
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    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return -EIO;

608
    return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
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}

611 612
int bdrv_pread(BlockDriverState *bs, int64_t offset,
               void *buf, int count1)
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{
    uint8_t tmp_buf[SECTOR_SIZE];
    int len, nb_sectors, count;
    int64_t sector_num;

    count = count1;
    /* first read to align to sector start */
    len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
    if (len > count)
        len = count;
    sector_num = offset >> SECTOR_BITS;
    if (len > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* read the sectors "in place" */
    nb_sectors = count >> SECTOR_BITS;
    if (nb_sectors > 0) {
        if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
            return -EIO;
        sector_num += nb_sectors;
        len = nb_sectors << SECTOR_BITS;
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(buf, tmp_buf, count);
    }
    return count1;
}

655 656
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                const void *buf, int count1)
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{
    uint8_t tmp_buf[SECTOR_SIZE];
    int len, nb_sectors, count;
    int64_t sector_num;

    count = count1;
    /* first write to align to sector start */
    len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
    if (len > count)
        len = count;
    sector_num = offset >> SECTOR_BITS;
    if (len > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* write the sectors "in place" */
    nb_sectors = count >> SECTOR_BITS;
    if (nb_sectors > 0) {
        if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
            return -EIO;
        sector_num += nb_sectors;
        len = nb_sectors << SECTOR_BITS;
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
        memcpy(tmp_buf, buf, count);
        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
            return -EIO;
    }
    return count1;
}

/**
 * Truncate file to 'offset' bytes (needed only for file protocols)
 */
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_truncate)
        return -ENOTSUP;
    return drv->bdrv_truncate(bs, offset);
}

/**
 * Length of a file in bytes. Return < 0 if error or unknown.
 */
int64_t bdrv_getlength(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_getlength) {
        /* legacy mode */
        return bs->total_sectors * SECTOR_SIZE;
    }
    return drv->bdrv_getlength(bs);
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}

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/* return 0 as number of sectors if no device present or error */
732
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
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{
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    int64_t length;
    length = bdrv_getlength(bs);
    if (length < 0)
        length = 0;
    else
        length = length >> SECTOR_BITS;
    *nb_sectors_ptr = length;
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}
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743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
struct partition {
        uint8_t boot_ind;           /* 0x80 - active */
        uint8_t head;               /* starting head */
        uint8_t sector;             /* starting sector */
        uint8_t cyl;                /* starting cylinder */
        uint8_t sys_ind;            /* What partition type */
        uint8_t end_head;           /* end head */
        uint8_t end_sector;         /* end sector */
        uint8_t end_cyl;            /* end cylinder */
        uint32_t start_sect;        /* starting sector counting from 0 */
        uint32_t nr_sects;          /* nr of sectors in partition */
} __attribute__((packed));

/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
static int guess_disk_lchs(BlockDriverState *bs,
                           int *pcylinders, int *pheads, int *psectors)
{
    uint8_t buf[512];
    int ret, i, heads, sectors, cylinders;
    struct partition *p;
    uint32_t nr_sects;
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    uint64_t nb_sectors;
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    bdrv_get_geometry(bs, &nb_sectors);

    ret = bdrv_read(bs, 0, buf, 1);
    if (ret < 0)
        return -1;
    /* test msdos magic */
    if (buf[510] != 0x55 || buf[511] != 0xaa)
        return -1;
    for(i = 0; i < 4; i++) {
        p = ((struct partition *)(buf + 0x1be)) + i;
        nr_sects = le32_to_cpu(p->nr_sects);
        if (nr_sects && p->end_head) {
            /* We make the assumption that the partition terminates on
               a cylinder boundary */
            heads = p->end_head + 1;
            sectors = p->end_sector & 63;
            if (sectors == 0)
                continue;
            cylinders = nb_sectors / (heads * sectors);
            if (cylinders < 1 || cylinders > 16383)
                continue;
            *pheads = heads;
            *psectors = sectors;
            *pcylinders = cylinders;
#if 0
            printf("guessed geometry: LCHS=%d %d %d\n",
                   cylinders, heads, sectors);
#endif
            return 0;
        }
    }
    return -1;
}

void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
{
    int translation, lba_detected = 0;
    int cylinders, heads, secs;
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    uint64_t nb_sectors;
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858

    /* if a geometry hint is available, use it */
    bdrv_get_geometry(bs, &nb_sectors);
    bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
    translation = bdrv_get_translation_hint(bs);
    if (cylinders != 0) {
        *pcyls = cylinders;
        *pheads = heads;
        *psecs = secs;
    } else {
        if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
            if (heads > 16) {
                /* if heads > 16, it means that a BIOS LBA
                   translation was active, so the default
                   hardware geometry is OK */
                lba_detected = 1;
                goto default_geometry;
            } else {
                *pcyls = cylinders;
                *pheads = heads;
                *psecs = secs;
                /* disable any translation to be in sync with
                   the logical geometry */
                if (translation == BIOS_ATA_TRANSLATION_AUTO) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_NONE);
                }
            }
        } else {
        default_geometry:
            /* if no geometry, use a standard physical disk geometry */
            cylinders = nb_sectors / (16 * 63);

            if (cylinders > 16383)
                cylinders = 16383;
            else if (cylinders < 2)
                cylinders = 2;
            *pcyls = cylinders;
            *pheads = 16;
            *psecs = 63;
            if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
                if ((*pcyls * *pheads) <= 131072) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LARGE);
                } else {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LBA);
                }
            }
        }
        bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
    }
}

859
void bdrv_set_geometry_hint(BlockDriverState *bs,
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                            int cyls, int heads, int secs)
{
    bs->cyls = cyls;
    bs->heads = heads;
    bs->secs = secs;
}

void bdrv_set_type_hint(BlockDriverState *bs, int type)
{
    bs->type = type;
    bs->removable = ((type == BDRV_TYPE_CDROM ||
                      type == BDRV_TYPE_FLOPPY));
}

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void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
{
    bs->translation = translation;
}

879
void bdrv_get_geometry_hint(BlockDriverState *bs,
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                            int *pcyls, int *pheads, int *psecs)
{
    *pcyls = bs->cyls;
    *pheads = bs->heads;
    *psecs = bs->secs;
}

int bdrv_get_type_hint(BlockDriverState *bs)
{
    return bs->type;
}

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int bdrv_get_translation_hint(BlockDriverState *bs)
{
    return bs->translation;
}

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int bdrv_is_removable(BlockDriverState *bs)
{
    return bs->removable;
}

int bdrv_is_read_only(BlockDriverState *bs)
{
    return bs->read_only;
}

907 908 909 910 911
int bdrv_is_sg(BlockDriverState *bs)
{
    return bs->sg;
}

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/* XXX: no longer used */
913
void bdrv_set_change_cb(BlockDriverState *bs,
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                        void (*change_cb)(void *opaque), void *opaque)
{
    bs->change_cb = change_cb;
    bs->change_opaque = opaque;
}

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int bdrv_is_encrypted(BlockDriverState *bs)
{
    if (bs->backing_hd && bs->backing_hd->encrypted)
        return 1;
    return bs->encrypted;
}

927 928 929 930 931 932 933 934 935
int bdrv_key_required(BlockDriverState *bs)
{
    BlockDriverState *backing_hd = bs->backing_hd;

    if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
        return 1;
    return (bs->encrypted && !bs->valid_key);
}

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int bdrv_set_key(BlockDriverState *bs, const char *key)
{
    int ret;
    if (bs->backing_hd && bs->backing_hd->encrypted) {
        ret = bdrv_set_key(bs->backing_hd, key);
        if (ret < 0)
            return ret;
        if (!bs->encrypted)
            return 0;
    }
    if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
        return -1;
948
    ret = bs->drv->bdrv_set_key(bs, key);
949 950 951 952 953 954 955 956 957
    if (ret < 0) {
        bs->valid_key = 0;
    } else if (!bs->valid_key) {
        bs->valid_key = 1;
        /* call the change callback now, we skipped it on open */
        bs->media_changed = 1;
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
958
    return ret;
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}

void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
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    if (!bs->drv) {
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        buf[0] = '\0';
    } else {
        pstrcpy(buf, buf_size, bs->drv->format_name);
    }
}

970
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
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                         void *opaque)
{
    BlockDriver *drv;

    for (drv = first_drv; drv != NULL; drv = drv->next) {
        it(opaque, drv->format_name);
    }
}

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BlockDriverState *bdrv_find(const char *name)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
        if (!strcmp(name, bs->device_name))
            return bs;
    }
    return NULL;
}

991
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
B
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{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
996
        it(opaque, bs);
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    }
}

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const char *bdrv_get_device_name(BlockDriverState *bs)
{
    return bs->device_name;
}

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void bdrv_flush(BlockDriverState *bs)
{
1007 1008
    if (!bs->drv)
        return;
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    if (bs->drv->bdrv_flush)
        bs->drv->bdrv_flush(bs);
    if (bs->backing_hd)
        bdrv_flush(bs->backing_hd);
}

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void bdrv_flush_all(void)
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next)
        if (bs->drv && !bdrv_is_read_only(bs) && 
            (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
            bdrv_flush(bs);
}

1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
/*
 * 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.
 *
 * '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.
 */
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
	int *pnum)
{
    int64_t n;
    if (!bs->drv->bdrv_is_allocated) {
        if (sector_num >= bs->total_sectors) {
            *pnum = 0;
            return 0;
        }
        n = bs->total_sectors - sector_num;
        *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
        return 1;
    }
    return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
}

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void bdrv_info(Monitor *mon)
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{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
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        monitor_printf(mon, "%s:", bs->device_name);
        monitor_printf(mon, " type=");
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        switch(bs->type) {
        case BDRV_TYPE_HD:
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            monitor_printf(mon, "hd");
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            break;
        case BDRV_TYPE_CDROM:
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            monitor_printf(mon, "cdrom");
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            break;
        case BDRV_TYPE_FLOPPY:
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            monitor_printf(mon, "floppy");
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            break;
        }
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        monitor_printf(mon, " removable=%d", bs->removable);
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        if (bs->removable) {
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            monitor_printf(mon, " locked=%d", bs->locked);
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        }
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        if (bs->drv) {
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            monitor_printf(mon, " file=");
            monitor_print_filename(mon, bs->filename);
1077
            if (bs->backing_file[0] != '\0') {
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                monitor_printf(mon, " backing_file=");
                monitor_print_filename(mon, bs->backing_file);
            }
            monitor_printf(mon, " ro=%d", bs->read_only);
            monitor_printf(mon, " drv=%s", bs->drv->format_name);
            monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
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        } else {
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            monitor_printf(mon, " [not inserted]");
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        }
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        monitor_printf(mon, "\n");
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    }
}
1090 1091

/* The "info blockstats" command. */
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void bdrv_info_stats(Monitor *mon)
1093 1094 1095 1096
{
    BlockDriverState *bs;

    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
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        monitor_printf(mon, "%s:"
                       " rd_bytes=%" PRIu64
                       " wr_bytes=%" PRIu64
                       " rd_operations=%" PRIu64
                       " wr_operations=%" PRIu64
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                       "\n",
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                       bs->device_name,
                       bs->rd_bytes, bs->wr_bytes,
                       bs->rd_ops, bs->wr_ops);
1106 1107
    }
}
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1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
{
    if (bs->backing_hd && bs->backing_hd->encrypted)
        return bs->backing_file;
    else if (bs->encrypted)
        return bs->filename;
    else
        return NULL;
}

1119
void bdrv_get_backing_filename(BlockDriverState *bs,
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                               char *filename, int filename_size)
{
    if (!bs->backing_hd) {
        pstrcpy(filename, filename_size, "");
    } else {
        pstrcpy(filename, filename_size, bs->backing_file);
    }
}

1129
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
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                          const uint8_t *buf, int nb_sectors)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_write_compressed)
        return -ENOTSUP;
    return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
1139

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int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_get_info)
        return -ENOTSUP;
    memset(bdi, 0, sizeof(*bdi));
    return drv->bdrv_get_info(bs, bdi);
}

1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
        return -ENOMEDIUM;
    if (!drv->bdrv_put_buffer)
        return -ENOTSUP;
    return drv->bdrv_put_buffer(bs, buf, pos, size);
}

int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
        return -ENOMEDIUM;
    if (!drv->bdrv_get_buffer)
        return -ENOTSUP;
    return drv->bdrv_get_buffer(bs, buf, pos, size);
}

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/**************************************************************/
/* handling of snapshots */

1174
int bdrv_snapshot_create(BlockDriverState *bs,
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                         QEMUSnapshotInfo *sn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_snapshot_create)
        return -ENOTSUP;
    return drv->bdrv_snapshot_create(bs, sn_info);
}

1185
int bdrv_snapshot_goto(BlockDriverState *bs,
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                       const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_snapshot_goto)
        return -ENOTSUP;
    return drv->bdrv_snapshot_goto(bs, snapshot_id);
}

int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_snapshot_delete)
        return -ENOTSUP;
    return drv->bdrv_snapshot_delete(bs, snapshot_id);
}

1206
int bdrv_snapshot_list(BlockDriverState *bs,
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                       QEMUSnapshotInfo **psn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
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        return -ENOMEDIUM;
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    if (!drv->bdrv_snapshot_list)
        return -ENOTSUP;
    return drv->bdrv_snapshot_list(bs, psn_info);
}

#define NB_SUFFIXES 4

char *get_human_readable_size(char *buf, int buf_size, int64_t size)
{
    static const char suffixes[NB_SUFFIXES] = "KMGT";
    int64_t base;
    int i;

    if (size <= 999) {
        snprintf(buf, buf_size, "%" PRId64, size);
    } else {
        base = 1024;
        for(i = 0; i < NB_SUFFIXES; i++) {
            if (size < (10 * base)) {
1231
                snprintf(buf, buf_size, "%0.1f%c",
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                         (double)size / base,
                         suffixes[i]);
                break;
            } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1236
                snprintf(buf, buf_size, "%" PRId64 "%c",
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                         ((size + (base >> 1)) / base),
                         suffixes[i]);
                break;
            }
            base = base * 1024;
        }
    }
    return buf;
}

char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
{
    char buf1[128], date_buf[128], clock_buf[128];
1250 1251 1252
#ifdef _WIN32
    struct tm *ptm;
#else
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    struct tm tm;
1254
#endif
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    time_t ti;
    int64_t secs;

    if (!sn) {
1259 1260
        snprintf(buf, buf_size,
                 "%-10s%-20s%7s%20s%15s",
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                 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
    } else {
        ti = sn->date_sec;
1264 1265 1266 1267 1268
#ifdef _WIN32
        ptm = localtime(&ti);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", ptm);
#else
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        localtime_r(&ti, &tm);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", &tm);
1272
#endif
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        secs = sn->vm_clock_nsec / 1000000000;
        snprintf(clock_buf, sizeof(clock_buf),
                 "%02d:%02d:%02d.%03d",
                 (int)(secs / 3600),
                 (int)((secs / 60) % 60),
1278
                 (int)(secs % 60),
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                 (int)((sn->vm_clock_nsec / 1000000) % 1000));
        snprintf(buf, buf_size,
1281
                 "%-10s%-20s%7s%20s%15s",
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                 sn->id_str, sn->name,
                 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                 date_buf,
                 clock_buf);
    }
    return buf;
}

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/**************************************************************/
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/* async I/Os */
B
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1293

1294
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1295
                                 QEMUIOVector *qiov, int nb_sectors,
1296
                                 BlockDriverCompletionFunc *cb, void *opaque)
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{
    BlockDriver *drv = bs->drv;
1299
    BlockDriverAIOCB *ret;
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    if (!drv)
1302
        return NULL;
1303 1304
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return NULL;
1305

1306 1307
    ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
                              cb, opaque);
1308 1309 1310 1311 1312 1313 1314 1315

    if (ret) {
	/* Update stats even though technically transfer has not happened. */
	bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
	bs->rd_ops ++;
    }

    return ret;
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}

1318 1319 1320
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
                                  QEMUIOVector *qiov, int nb_sectors,
                                  BlockDriverCompletionFunc *cb, void *opaque)
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{
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    BlockDriver *drv = bs->drv;
1323
    BlockDriverAIOCB *ret;
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B
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    if (!drv)
1326
        return NULL;
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    if (bs->read_only)
1328
        return NULL;
1329 1330
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return NULL;
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1332 1333
    ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
                               cb, opaque);
1334 1335 1336 1337 1338 1339 1340 1341

    if (ret) {
	/* Update stats even though technically transfer has not happened. */
	bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
	bs->wr_ops ++;
    }

    return ret;
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}

void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
1346
    acb->pool->cancel(acb);
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}

1349

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/**************************************************************/
/* async block device emulation */

1353
static void bdrv_aio_bh_cb(void *opaque)
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{
1355
    BlockDriverAIOCBSync *acb = opaque;
1356 1357 1358

    if (!acb->is_write)
        qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1359
    qemu_vfree(acb->bounce);
1360
    acb->common.cb(acb->common.opaque, acb->ret);
1361

1362
    qemu_aio_release(acb);
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}
1364

1365 1366 1367 1368 1369 1370 1371 1372
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
                                            int64_t sector_num,
                                            QEMUIOVector *qiov,
                                            int nb_sectors,
                                            BlockDriverCompletionFunc *cb,
                                            void *opaque,
                                            int is_write)

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{
1374 1375 1376
    BlockDriverAIOCBSync *acb;

    acb = qemu_aio_get(bs, cb, opaque);
1377 1378 1379 1380
    acb->is_write = is_write;
    acb->qiov = qiov;
    acb->bounce = qemu_memalign(512, qiov->size);

1381 1382
    if (!acb->bh)
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1383 1384 1385 1386 1387 1388 1389 1390

    if (is_write) {
        qemu_iovec_to_buffer(acb->qiov, acb->bounce);
        acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
    } else {
        acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
    }

1391
    qemu_bh_schedule(acb->bh);
1392

1393
    return &acb->common;
1394 1395
}

1396 1397
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1398
        BlockDriverCompletionFunc *cb, void *opaque)
1399
{
1400 1401
    return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
}
B
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1403 1404 1405 1406 1407
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1408 1409
}

1410

1411
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
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{
1413 1414 1415
    BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
    qemu_bh_cancel(acb->bh);
    qemu_aio_release(acb);
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}
B
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1417

B
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/**************************************************************/
/* sync block device emulation */
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B
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static void bdrv_rw_em_cb(void *opaque, int ret)
{
    *(int *)opaque = ret;
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}

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#define NOT_DONE 0x7fffffff

1428
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
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                        uint8_t *buf, int nb_sectors)
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{
1431 1432
    int async_ret;
    BlockDriverAIOCB *acb;
1433 1434
    struct iovec iov;
    QEMUIOVector qiov;
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    async_ret = NOT_DONE;
1437
    iov.iov_base = (void *)buf;
1438 1439 1440 1441
    iov.iov_len = nb_sectors * 512;
    qemu_iovec_init_external(&qiov, &iov, 1);
    acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
        bdrv_rw_em_cb, &async_ret);
1442
    if (acb == NULL)
1443
        return -1;
1444

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    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
1448

B
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    return async_ret;
P
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}

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static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors)
{
1455 1456
    int async_ret;
    BlockDriverAIOCB *acb;
1457 1458
    struct iovec iov;
    QEMUIOVector qiov;
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    async_ret = NOT_DONE;
1461 1462 1463 1464 1465
    iov.iov_base = (void *)buf;
    iov.iov_len = nb_sectors * 512;
    qemu_iovec_init_external(&qiov, &iov, 1);
    acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
        bdrv_rw_em_cb, &async_ret);
1466
    if (acb == NULL)
1467
        return -1;
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    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
    return async_ret;
}
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void bdrv_init(void)
{
    bdrv_register(&bdrv_raw);
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    bdrv_register(&bdrv_host_device);
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#ifndef _WIN32
    bdrv_register(&bdrv_cow);
#endif
    bdrv_register(&bdrv_qcow);
    bdrv_register(&bdrv_vmdk);
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    bdrv_register(&bdrv_cloop);
1484
    bdrv_register(&bdrv_dmg);
1485
    bdrv_register(&bdrv_bochs);
1486
    bdrv_register(&bdrv_vpc);
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    bdrv_register(&bdrv_vvfat);
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    bdrv_register(&bdrv_qcow2);
1489
    bdrv_register(&bdrv_parallels);
1490
    bdrv_register(&bdrv_nbd);
B
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}
1492

1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
void aio_pool_init(AIOPool *pool, int aiocb_size,
                   void (*cancel)(BlockDriverAIOCB *acb))
{
    pool->aiocb_size = aiocb_size;
    pool->cancel = cancel;
    pool->free_aiocb = NULL;
}

void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
                        BlockDriverCompletionFunc *cb, void *opaque)
1503 1504 1505
{
    BlockDriverAIOCB *acb;

1506 1507 1508
    if (pool->free_aiocb) {
        acb = pool->free_aiocb;
        pool->free_aiocb = acb->next;
1509
    } else {
1510 1511
        acb = qemu_mallocz(pool->aiocb_size);
        acb->pool = pool;
1512 1513 1514 1515 1516 1517 1518
    }
    acb->bs = bs;
    acb->cb = cb;
    acb->opaque = opaque;
    return acb;
}

1519 1520 1521 1522 1523 1524
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
                   void *opaque)
{
    return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
}

1525 1526
void qemu_aio_release(void *p)
{
1527 1528 1529 1530
    BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
    AIOPool *pool = acb->pool;
    acb->next = pool->free_aiocb;
    pool->free_aiocb = acb;
1531
}
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/**************************************************************/
/* removable device support */

/**
 * Return TRUE if the media is present
 */
int bdrv_is_inserted(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;
    if (!drv)
        return 0;
    if (!drv->bdrv_is_inserted)
        return 1;
    ret = drv->bdrv_is_inserted(bs);
    return ret;
}

/**
 * Return TRUE if the media changed since the last call to this
1553
 * function. It is currently only used for floppy disks
B
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 */
int bdrv_media_changed(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;

    if (!drv || !drv->bdrv_media_changed)
        ret = -ENOTSUP;
    else
        ret = drv->bdrv_media_changed(bs);
    if (ret == -ENOTSUP)
        ret = bs->media_changed;
    bs->media_changed = 0;
    return ret;
}

/**
 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
 */
void bdrv_eject(BlockDriverState *bs, int eject_flag)
{
    BlockDriver *drv = bs->drv;
    int ret;

    if (!drv || !drv->bdrv_eject) {
        ret = -ENOTSUP;
    } else {
        ret = drv->bdrv_eject(bs, eject_flag);
    }
    if (ret == -ENOTSUP) {
        if (eject_flag)
            bdrv_close(bs);
    }
}

int bdrv_is_locked(BlockDriverState *bs)
{
    return bs->locked;
}

/**
 * Lock or unlock the media (if it is locked, the user won't be able
 * to eject it manually).
 */
void bdrv_set_locked(BlockDriverState *bs, int locked)
{
    BlockDriver *drv = bs->drv;

    bs->locked = locked;
    if (drv && drv->bdrv_set_locked) {
        drv->bdrv_set_locked(bs, locked);
    }
}
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617

/* needed for generic scsi interface */

int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
    BlockDriver *drv = bs->drv;

    if (drv && drv->bdrv_ioctl)
        return drv->bdrv_ioctl(bs, req, buf);
    return -ENOTSUP;
}
1618

1619 1620 1621
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque)
1622
{
1623
    BlockDriver *drv = bs->drv;
1624

1625 1626 1627
    if (drv && drv->bdrv_aio_ioctl)
        return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
    return NULL;
1628
}