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src/sparse-0.4.4/perl/t/include/block/block_int.h  view on Meta::CPAN

 * Copyright (c) 2003 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.
 */
#ifndef BLOCK_INT_H
#define BLOCK_INT_H

#include "block/block.h"
#include "qemu/option.h"
#include "qemu/queue.h"
#include "block/coroutine.h"
#include "qemu/timer.h"
#include "qapi-types.h"
#include "qapi/qmp/qerror.h"
#include "monitor/monitor.h"
#include "qemu/hbitmap.h"
#include "block/snapshot.h"
#include "qemu/main-loop.h"
#include "qemu/throttle.h"

#define BLOCK_FLAG_ENCRYPT          1
#define BLOCK_FLAG_COMPAT6          4
#define BLOCK_FLAG_LAZY_REFCOUNTS   8

#define BLOCK_OPT_SIZE              "size"
#define BLOCK_OPT_ENCRYPT           "encryption"
#define BLOCK_OPT_COMPAT6           "compat6"
#define BLOCK_OPT_BACKING_FILE      "backing_file"
#define BLOCK_OPT_BACKING_FMT       "backing_fmt"
#define BLOCK_OPT_CLUSTER_SIZE      "cluster_size"
#define BLOCK_OPT_TABLE_SIZE        "table_size"
#define BLOCK_OPT_PREALLOC          "preallocation"
#define BLOCK_OPT_SUBFMT            "subformat"
#define BLOCK_OPT_COMPAT_LEVEL      "compat"
#define BLOCK_OPT_LAZY_REFCOUNTS    "lazy_refcounts"
#define BLOCK_OPT_ADAPTER_TYPE      "adapter_type"

typedef struct BdrvTrackedRequest {
    BlockDriverState *bs;
    int64_t sector_num;
    int nb_sectors;
    bool is_write;
    QLIST_ENTRY(BdrvTrackedRequest) list;
    Coroutine *co; /* owner, used for deadlock detection */
    CoQueue wait_queue; /* coroutines blocked on this request */
} BdrvTrackedRequest;

struct BlockDriver {
    const char *format_name;
    int instance_size;

    /* if not defined external snapshots are allowed
     * future block filters will query their children to build the response
     */
    ExtSnapshotPerm (*bdrv_check_ext_snapshot)(BlockDriverState *bs);

    int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
    int (*bdrv_probe_device)(const char *filename);

    /* Any driver implementing this callback is expected to be able to handle
     * NULL file names in its .bdrv_open() implementation */
    void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp);
    /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
     * this field set to true, except ones that are defined only by their
     * child's bs.
     * An example of the last type will be the quorum block driver.
     */
    bool bdrv_needs_filename;

    /* For handling image reopen for split or non-split files */
    int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state,
                               BlockReopenQueue *queue, Error **errp);
    void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state);
    void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state);

    int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags,
                     Error **errp);
    int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags,
                          Error **errp);
    int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors);
    int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
                      const uint8_t *buf, int nb_sectors);
    void (*bdrv_close)(BlockDriverState *bs);
    void (*bdrv_rebind)(BlockDriverState *bs);
    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options,
                       Error **errp);
    int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
    int (*bdrv_make_empty)(BlockDriverState *bs);
    /* aio */
    BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);

    int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
    int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,

src/sparse-0.4.4/perl/t/include/block/block_int.h  view on Meta::CPAN

    int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors);
    int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, int *pnum);

    /*
     * Invalidate any cached meta-data.
     */
    void (*bdrv_invalidate_cache)(BlockDriverState *bs);

    /*
     * Flushes all data that was already written to the OS all the way down to
     * the disk (for example raw-posix calls fsync()).
     */
    int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);

    /*
     * Flushes all internal caches to the OS. The data may still sit in a
     * writeback cache of the host OS, but it will survive a crash of the qemu
     * process.
     */
    int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);

    const char *protocol_name;
    int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);

    int64_t (*bdrv_getlength)(BlockDriverState *bs);
    bool has_variable_length;
    int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);

    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors);

    int (*bdrv_snapshot_create)(BlockDriverState *bs,
                                QEMUSnapshotInfo *sn_info);
    int (*bdrv_snapshot_goto)(BlockDriverState *bs,
                              const char *snapshot_id);
    int (*bdrv_snapshot_delete)(BlockDriverState *bs,
                                const char *snapshot_id,
                                const char *name,
                                Error **errp);
    int (*bdrv_snapshot_list)(BlockDriverState *bs,
                              QEMUSnapshotInfo **psn_info);
    int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
                                  const char *snapshot_name);
    int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
    ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);

    int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
                             int64_t pos);
    int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
                             int64_t pos, int size);

    int (*bdrv_change_backing_file)(BlockDriverState *bs,
        const char *backing_file, const char *backing_fmt);

    /* removable device specific */
    int (*bdrv_is_inserted)(BlockDriverState *bs);
    int (*bdrv_media_changed)(BlockDriverState *bs);
    void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
    void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);

    /* to control generic scsi devices */
    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
    BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque);

    /* List of options for creating images, terminated by name == NULL */
    QEMUOptionParameter *create_options;


    /*
     * Returns 0 for completed check, -errno for internal errors.
     * The check results are stored in result.
     */
    int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
        BdrvCheckMode fix);

    int (*bdrv_amend_options)(BlockDriverState *bs,
        QEMUOptionParameter *options);

    void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);

    /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
    int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event,
        const char *tag);
    int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag);
    bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag);

    /*
     * Returns 1 if newly created images are guaranteed to contain only
     * zeros, 0 otherwise.
     */
    int (*bdrv_has_zero_init)(BlockDriverState *bs);

    QLIST_ENTRY(BlockDriver) list;
};

/*
 * Note: the function bdrv_append() copies and swaps contents of
 * BlockDriverStates, so if you add new fields to this struct, please
 * inspect bdrv_append() to determine if the new fields need to be
 * copied as well.
 */
struct BlockDriverState {
    int64_t total_sectors; /* if we are reading a disk image, give its
                              size in sectors */
    int read_only; /* if true, the media is read only */
    int open_flags; /* flags used to open the file, re-used for re-open */
    int encrypted; /* if true, the media is encrypted */
    int valid_key; /* if true, a valid encryption key has been set */
    int sg;        /* if true, the device is a /dev/sg* */
    int copy_on_read; /* if true, copy read backing sectors into image
                         note this is a reference count */

    BlockDriver *drv; /* NULL means no media */
    void *opaque;

    void *dev;                  /* attached device model, if any */
    /* TODO change to DeviceState when all users are qdevified */