BlockBackend is used as the interface between the block layer and guest devices. It should therefore assure that all requests are clamped to the image size. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-id: 1423162705-32065-15-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
895 lines
22 KiB
C
895 lines
22 KiB
C
/*
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* QEMU Block backends
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*
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* Authors:
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* Markus Armbruster <armbru@redhat.com>,
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1
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* or later. See the COPYING.LIB file in the top-level directory.
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*/
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#include "sysemu/block-backend.h"
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#include "block/block_int.h"
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#include "sysemu/blockdev.h"
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#include "qapi-event.h"
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/* Number of coroutines to reserve per attached device model */
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#define COROUTINE_POOL_RESERVATION 64
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struct BlockBackend {
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char *name;
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int refcnt;
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BlockDriverState *bs;
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DriveInfo *legacy_dinfo; /* null unless created by drive_new() */
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QTAILQ_ENTRY(BlockBackend) link; /* for blk_backends */
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void *dev; /* attached device model, if any */
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/* TODO change to DeviceState when all users are qdevified */
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const BlockDevOps *dev_ops;
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void *dev_opaque;
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};
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typedef struct BlockBackendAIOCB {
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BlockAIOCB common;
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QEMUBH *bh;
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int ret;
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} BlockBackendAIOCB;
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static const AIOCBInfo block_backend_aiocb_info = {
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.aiocb_size = sizeof(BlockBackendAIOCB),
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};
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static void drive_info_del(DriveInfo *dinfo);
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/* All the BlockBackends (except for hidden ones) */
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static QTAILQ_HEAD(, BlockBackend) blk_backends =
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QTAILQ_HEAD_INITIALIZER(blk_backends);
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/*
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* Create a new BlockBackend with @name, with a reference count of one.
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* @name must not be null or empty.
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* Fail if a BlockBackend with this name already exists.
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* Store an error through @errp on failure, unless it's null.
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* Return the new BlockBackend on success, null on failure.
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*/
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BlockBackend *blk_new(const char *name, Error **errp)
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{
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BlockBackend *blk;
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assert(name && name[0]);
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if (!id_wellformed(name)) {
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error_setg(errp, "Invalid device name");
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return NULL;
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}
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if (blk_by_name(name)) {
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error_setg(errp, "Device with id '%s' already exists", name);
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return NULL;
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}
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if (bdrv_find_node(name)) {
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error_setg(errp,
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"Device name '%s' conflicts with an existing node name",
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name);
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return NULL;
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}
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blk = g_new0(BlockBackend, 1);
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blk->name = g_strdup(name);
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blk->refcnt = 1;
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QTAILQ_INSERT_TAIL(&blk_backends, blk, link);
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return blk;
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}
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/*
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* Create a new BlockBackend with a new BlockDriverState attached.
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* Otherwise just like blk_new(), which see.
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*/
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BlockBackend *blk_new_with_bs(const char *name, Error **errp)
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{
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BlockBackend *blk;
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BlockDriverState *bs;
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blk = blk_new(name, errp);
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if (!blk) {
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return NULL;
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}
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bs = bdrv_new_root();
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blk->bs = bs;
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bs->blk = blk;
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return blk;
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}
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/*
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* Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState.
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*
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* Just as with bdrv_open(), after having called this function the reference to
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* @options belongs to the block layer (even on failure).
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*
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* TODO: Remove @filename and @flags; it should be possible to specify a whole
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* BDS tree just by specifying the @options QDict (or @reference,
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* alternatively). At the time of adding this function, this is not possible,
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* though, so callers of this function have to be able to specify @filename and
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* @flags.
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*/
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BlockBackend *blk_new_open(const char *name, const char *filename,
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const char *reference, QDict *options, int flags,
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Error **errp)
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{
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BlockBackend *blk;
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int ret;
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blk = blk_new_with_bs(name, errp);
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if (!blk) {
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QDECREF(options);
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return NULL;
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}
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ret = bdrv_open(&blk->bs, filename, reference, options, flags, NULL, errp);
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if (ret < 0) {
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blk_unref(blk);
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return NULL;
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}
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return blk;
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}
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static void blk_delete(BlockBackend *blk)
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{
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assert(!blk->refcnt);
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assert(!blk->dev);
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if (blk->bs) {
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assert(blk->bs->blk == blk);
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blk->bs->blk = NULL;
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bdrv_unref(blk->bs);
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blk->bs = NULL;
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}
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/* Avoid double-remove after blk_hide_on_behalf_of_do_drive_del() */
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if (blk->name[0]) {
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QTAILQ_REMOVE(&blk_backends, blk, link);
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}
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g_free(blk->name);
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drive_info_del(blk->legacy_dinfo);
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g_free(blk);
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}
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static void drive_info_del(DriveInfo *dinfo)
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{
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if (!dinfo) {
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return;
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}
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qemu_opts_del(dinfo->opts);
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g_free(dinfo->serial);
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g_free(dinfo);
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}
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/*
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* Increment @blk's reference count.
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* @blk must not be null.
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*/
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void blk_ref(BlockBackend *blk)
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{
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blk->refcnt++;
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}
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/*
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* Decrement @blk's reference count.
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* If this drops it to zero, destroy @blk.
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* For convenience, do nothing if @blk is null.
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*/
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void blk_unref(BlockBackend *blk)
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{
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if (blk) {
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assert(blk->refcnt > 0);
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if (!--blk->refcnt) {
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blk_delete(blk);
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}
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}
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}
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/*
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* Return the BlockBackend after @blk.
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* If @blk is null, return the first one.
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* Else, return @blk's next sibling, which may be null.
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*
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* To iterate over all BlockBackends, do
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* for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
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* ...
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* }
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*/
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BlockBackend *blk_next(BlockBackend *blk)
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{
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return blk ? QTAILQ_NEXT(blk, link) : QTAILQ_FIRST(&blk_backends);
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}
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/*
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* Return @blk's name, a non-null string.
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* Wart: the name is empty iff @blk has been hidden with
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* blk_hide_on_behalf_of_do_drive_del().
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*/
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const char *blk_name(BlockBackend *blk)
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{
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return blk->name;
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}
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/*
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* Return the BlockBackend with name @name if it exists, else null.
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* @name must not be null.
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*/
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BlockBackend *blk_by_name(const char *name)
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{
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BlockBackend *blk;
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assert(name);
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QTAILQ_FOREACH(blk, &blk_backends, link) {
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if (!strcmp(name, blk->name)) {
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return blk;
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}
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}
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return NULL;
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}
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/*
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* Return the BlockDriverState attached to @blk if any, else null.
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*/
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BlockDriverState *blk_bs(BlockBackend *blk)
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{
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return blk->bs;
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}
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/*
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* Return @blk's DriveInfo if any, else null.
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*/
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DriveInfo *blk_legacy_dinfo(BlockBackend *blk)
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{
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return blk->legacy_dinfo;
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}
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/*
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* Set @blk's DriveInfo to @dinfo, and return it.
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* @blk must not have a DriveInfo set already.
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* No other BlockBackend may have the same DriveInfo set.
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*/
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DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo)
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{
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assert(!blk->legacy_dinfo);
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return blk->legacy_dinfo = dinfo;
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}
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/*
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* Return the BlockBackend with DriveInfo @dinfo.
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* It must exist.
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*/
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BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo)
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{
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BlockBackend *blk;
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QTAILQ_FOREACH(blk, &blk_backends, link) {
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if (blk->legacy_dinfo == dinfo) {
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return blk;
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}
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}
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abort();
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}
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/*
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* Hide @blk.
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* @blk must not have been hidden already.
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* Make attached BlockDriverState, if any, anonymous.
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* Once hidden, @blk is invisible to all functions that don't receive
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* it as argument. For example, blk_by_name() won't return it.
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* Strictly for use by do_drive_del().
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* TODO get rid of it!
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*/
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void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk)
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{
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QTAILQ_REMOVE(&blk_backends, blk, link);
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blk->name[0] = 0;
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if (blk->bs) {
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bdrv_make_anon(blk->bs);
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}
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}
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/*
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* Attach device model @dev to @blk.
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* Return 0 on success, -EBUSY when a device model is attached already.
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*/
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int blk_attach_dev(BlockBackend *blk, void *dev)
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/* TODO change to DeviceState *dev when all users are qdevified */
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{
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if (blk->dev) {
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return -EBUSY;
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}
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blk_ref(blk);
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blk->dev = dev;
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bdrv_iostatus_reset(blk->bs);
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return 0;
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}
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/*
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* Attach device model @dev to @blk.
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* @blk must not have a device model attached already.
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* TODO qdevified devices don't use this, remove when devices are qdevified
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*/
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void blk_attach_dev_nofail(BlockBackend *blk, void *dev)
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{
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if (blk_attach_dev(blk, dev) < 0) {
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abort();
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}
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}
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/*
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* Detach device model @dev from @blk.
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* @dev must be currently attached to @blk.
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*/
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void blk_detach_dev(BlockBackend *blk, void *dev)
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/* TODO change to DeviceState *dev when all users are qdevified */
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{
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assert(blk->dev == dev);
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blk->dev = NULL;
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blk->dev_ops = NULL;
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blk->dev_opaque = NULL;
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bdrv_set_guest_block_size(blk->bs, 512);
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blk_unref(blk);
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}
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/*
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* Return the device model attached to @blk if any, else null.
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*/
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void *blk_get_attached_dev(BlockBackend *blk)
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/* TODO change to return DeviceState * when all users are qdevified */
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{
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return blk->dev;
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}
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/*
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* Set @blk's device model callbacks to @ops.
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* @opaque is the opaque argument to pass to the callbacks.
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* This is for use by device models.
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*/
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void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
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void *opaque)
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{
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blk->dev_ops = ops;
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blk->dev_opaque = opaque;
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}
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/*
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* Notify @blk's attached device model of media change.
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* If @load is true, notify of media load.
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* Else, notify of media eject.
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* Also send DEVICE_TRAY_MOVED events as appropriate.
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*/
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void blk_dev_change_media_cb(BlockBackend *blk, bool load)
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{
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if (blk->dev_ops && blk->dev_ops->change_media_cb) {
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bool tray_was_closed = !blk_dev_is_tray_open(blk);
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blk->dev_ops->change_media_cb(blk->dev_opaque, load);
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if (tray_was_closed) {
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/* tray open */
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qapi_event_send_device_tray_moved(blk_name(blk),
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true, &error_abort);
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}
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if (load) {
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/* tray close */
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qapi_event_send_device_tray_moved(blk_name(blk),
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false, &error_abort);
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}
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}
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}
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/*
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* Does @blk's attached device model have removable media?
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* %true if no device model is attached.
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*/
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bool blk_dev_has_removable_media(BlockBackend *blk)
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{
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return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb);
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}
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/*
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* Notify @blk's attached device model of a media eject request.
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* If @force is true, the medium is about to be yanked out forcefully.
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*/
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void blk_dev_eject_request(BlockBackend *blk, bool force)
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{
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if (blk->dev_ops && blk->dev_ops->eject_request_cb) {
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blk->dev_ops->eject_request_cb(blk->dev_opaque, force);
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}
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}
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/*
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* Does @blk's attached device model have a tray, and is it open?
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*/
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bool blk_dev_is_tray_open(BlockBackend *blk)
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{
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if (blk->dev_ops && blk->dev_ops->is_tray_open) {
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return blk->dev_ops->is_tray_open(blk->dev_opaque);
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}
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return false;
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}
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|
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/*
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* Does @blk's attached device model have the medium locked?
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* %false if the device model has no such lock.
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*/
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bool blk_dev_is_medium_locked(BlockBackend *blk)
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{
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if (blk->dev_ops && blk->dev_ops->is_medium_locked) {
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return blk->dev_ops->is_medium_locked(blk->dev_opaque);
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}
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return false;
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}
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|
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/*
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* Notify @blk's attached device model of a backend size change.
|
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*/
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void blk_dev_resize_cb(BlockBackend *blk)
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{
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if (blk->dev_ops && blk->dev_ops->resize_cb) {
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blk->dev_ops->resize_cb(blk->dev_opaque);
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}
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}
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|
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void blk_iostatus_enable(BlockBackend *blk)
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{
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bdrv_iostatus_enable(blk->bs);
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}
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|
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static int blk_check_byte_request(BlockBackend *blk, int64_t offset,
|
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size_t size)
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{
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int64_t len;
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|
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if (size > INT_MAX) {
|
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return -EIO;
|
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}
|
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|
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if (!blk_is_inserted(blk)) {
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return -ENOMEDIUM;
|
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}
|
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|
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len = blk_getlength(blk);
|
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if (len < 0) {
|
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return len;
|
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}
|
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|
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if (offset < 0) {
|
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return -EIO;
|
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}
|
|
|
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if (offset > len || len - offset < size) {
|
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return -EIO;
|
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}
|
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|
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return 0;
|
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}
|
|
|
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static int blk_check_request(BlockBackend *blk, int64_t sector_num,
|
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int nb_sectors)
|
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{
|
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if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) {
|
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return -EIO;
|
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}
|
|
|
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if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
|
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return -EIO;
|
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}
|
|
|
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return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE,
|
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nb_sectors * BDRV_SECTOR_SIZE);
|
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}
|
|
|
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int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
|
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int nb_sectors)
|
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{
|
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int ret = blk_check_request(blk, sector_num, nb_sectors);
|
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if (ret < 0) {
|
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return ret;
|
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}
|
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|
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return bdrv_read(blk->bs, sector_num, buf, nb_sectors);
|
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}
|
|
|
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int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
|
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int nb_sectors)
|
|
{
|
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int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
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return ret;
|
|
}
|
|
|
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return bdrv_read_unthrottled(blk->bs, sector_num, buf, nb_sectors);
|
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}
|
|
|
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int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
|
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int nb_sectors)
|
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{
|
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int ret = blk_check_request(blk, sector_num, nb_sectors);
|
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if (ret < 0) {
|
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return ret;
|
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}
|
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|
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return bdrv_write(blk->bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
static void error_callback_bh(void *opaque)
|
|
{
|
|
struct BlockBackendAIOCB *acb = opaque;
|
|
qemu_bh_delete(acb->bh);
|
|
acb->common.cb(acb->common.opaque, acb->ret);
|
|
qemu_aio_unref(acb);
|
|
}
|
|
|
|
static BlockAIOCB *abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb,
|
|
void *opaque, int ret)
|
|
{
|
|
struct BlockBackendAIOCB *acb;
|
|
QEMUBH *bh;
|
|
|
|
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
|
|
acb->ret = ret;
|
|
|
|
bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb);
|
|
acb->bh = bh;
|
|
qemu_bh_schedule(bh);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
|
|
int nb_sectors, BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return abort_aio_request(blk, cb, opaque, ret);
|
|
}
|
|
|
|
return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags,
|
|
cb, opaque);
|
|
}
|
|
|
|
int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count)
|
|
{
|
|
int ret = blk_check_byte_request(blk, offset, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_pread(blk->bs, offset, buf, count);
|
|
}
|
|
|
|
int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count)
|
|
{
|
|
int ret = blk_check_byte_request(blk, offset, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_pwrite(blk->bs, offset, buf, count);
|
|
}
|
|
|
|
int64_t blk_getlength(BlockBackend *blk)
|
|
{
|
|
return bdrv_getlength(blk->bs);
|
|
}
|
|
|
|
void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
|
|
{
|
|
bdrv_get_geometry(blk->bs, nb_sectors_ptr);
|
|
}
|
|
|
|
int64_t blk_nb_sectors(BlockBackend *blk)
|
|
{
|
|
return bdrv_nb_sectors(blk->bs);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
|
|
QEMUIOVector *iov, int nb_sectors,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return abort_aio_request(blk, cb, opaque, ret);
|
|
}
|
|
|
|
return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
|
|
QEMUIOVector *iov, int nb_sectors,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return abort_aio_request(blk, cb, opaque, ret);
|
|
}
|
|
|
|
return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_flush(BlockBackend *blk,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_flush(blk->bs, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_discard(BlockBackend *blk,
|
|
int64_t sector_num, int nb_sectors,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return abort_aio_request(blk, cb, opaque, ret);
|
|
}
|
|
|
|
return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque);
|
|
}
|
|
|
|
void blk_aio_cancel(BlockAIOCB *acb)
|
|
{
|
|
bdrv_aio_cancel(acb);
|
|
}
|
|
|
|
void blk_aio_cancel_async(BlockAIOCB *acb)
|
|
{
|
|
bdrv_aio_cancel_async(acb);
|
|
}
|
|
|
|
int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < num_reqs; i++) {
|
|
ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return bdrv_aio_multiwrite(blk->bs, reqs, num_reqs);
|
|
}
|
|
|
|
int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
|
|
{
|
|
return bdrv_ioctl(blk->bs, req, buf);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque);
|
|
}
|
|
|
|
int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_co_discard(blk->bs, sector_num, nb_sectors);
|
|
}
|
|
|
|
int blk_co_flush(BlockBackend *blk)
|
|
{
|
|
return bdrv_co_flush(blk->bs);
|
|
}
|
|
|
|
int blk_flush(BlockBackend *blk)
|
|
{
|
|
return bdrv_flush(blk->bs);
|
|
}
|
|
|
|
int blk_flush_all(void)
|
|
{
|
|
return bdrv_flush_all();
|
|
}
|
|
|
|
void blk_drain_all(void)
|
|
{
|
|
bdrv_drain_all();
|
|
}
|
|
|
|
BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read)
|
|
{
|
|
return bdrv_get_on_error(blk->bs, is_read);
|
|
}
|
|
|
|
BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
|
|
int error)
|
|
{
|
|
return bdrv_get_error_action(blk->bs, is_read, error);
|
|
}
|
|
|
|
void blk_error_action(BlockBackend *blk, BlockErrorAction action,
|
|
bool is_read, int error)
|
|
{
|
|
bdrv_error_action(blk->bs, action, is_read, error);
|
|
}
|
|
|
|
int blk_is_read_only(BlockBackend *blk)
|
|
{
|
|
return bdrv_is_read_only(blk->bs);
|
|
}
|
|
|
|
int blk_is_sg(BlockBackend *blk)
|
|
{
|
|
return bdrv_is_sg(blk->bs);
|
|
}
|
|
|
|
int blk_enable_write_cache(BlockBackend *blk)
|
|
{
|
|
return bdrv_enable_write_cache(blk->bs);
|
|
}
|
|
|
|
void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
|
|
{
|
|
bdrv_set_enable_write_cache(blk->bs, wce);
|
|
}
|
|
|
|
void blk_invalidate_cache(BlockBackend *blk, Error **errp)
|
|
{
|
|
bdrv_invalidate_cache(blk->bs, errp);
|
|
}
|
|
|
|
int blk_is_inserted(BlockBackend *blk)
|
|
{
|
|
return bdrv_is_inserted(blk->bs);
|
|
}
|
|
|
|
void blk_lock_medium(BlockBackend *blk, bool locked)
|
|
{
|
|
bdrv_lock_medium(blk->bs, locked);
|
|
}
|
|
|
|
void blk_eject(BlockBackend *blk, bool eject_flag)
|
|
{
|
|
bdrv_eject(blk->bs, eject_flag);
|
|
}
|
|
|
|
int blk_get_flags(BlockBackend *blk)
|
|
{
|
|
return bdrv_get_flags(blk->bs);
|
|
}
|
|
|
|
int blk_get_max_transfer_length(BlockBackend *blk)
|
|
{
|
|
return blk->bs->bl.max_transfer_length;
|
|
}
|
|
|
|
void blk_set_guest_block_size(BlockBackend *blk, int align)
|
|
{
|
|
bdrv_set_guest_block_size(blk->bs, align);
|
|
}
|
|
|
|
void *blk_blockalign(BlockBackend *blk, size_t size)
|
|
{
|
|
return qemu_blockalign(blk ? blk->bs : NULL, size);
|
|
}
|
|
|
|
bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
|
|
{
|
|
return bdrv_op_is_blocked(blk->bs, op, errp);
|
|
}
|
|
|
|
void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
|
|
{
|
|
bdrv_op_unblock(blk->bs, op, reason);
|
|
}
|
|
|
|
void blk_op_block_all(BlockBackend *blk, Error *reason)
|
|
{
|
|
bdrv_op_block_all(blk->bs, reason);
|
|
}
|
|
|
|
void blk_op_unblock_all(BlockBackend *blk, Error *reason)
|
|
{
|
|
bdrv_op_unblock_all(blk->bs, reason);
|
|
}
|
|
|
|
AioContext *blk_get_aio_context(BlockBackend *blk)
|
|
{
|
|
return bdrv_get_aio_context(blk->bs);
|
|
}
|
|
|
|
void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
|
|
{
|
|
bdrv_set_aio_context(blk->bs, new_context);
|
|
}
|
|
|
|
void blk_add_aio_context_notifier(BlockBackend *blk,
|
|
void (*attached_aio_context)(AioContext *new_context, void *opaque),
|
|
void (*detach_aio_context)(void *opaque), void *opaque)
|
|
{
|
|
bdrv_add_aio_context_notifier(blk->bs, attached_aio_context,
|
|
detach_aio_context, opaque);
|
|
}
|
|
|
|
void blk_remove_aio_context_notifier(BlockBackend *blk,
|
|
void (*attached_aio_context)(AioContext *,
|
|
void *),
|
|
void (*detach_aio_context)(void *),
|
|
void *opaque)
|
|
{
|
|
bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context,
|
|
detach_aio_context, opaque);
|
|
}
|
|
|
|
void blk_add_close_notifier(BlockBackend *blk, Notifier *notify)
|
|
{
|
|
bdrv_add_close_notifier(blk->bs, notify);
|
|
}
|
|
|
|
void blk_io_plug(BlockBackend *blk)
|
|
{
|
|
bdrv_io_plug(blk->bs);
|
|
}
|
|
|
|
void blk_io_unplug(BlockBackend *blk)
|
|
{
|
|
bdrv_io_unplug(blk->bs);
|
|
}
|
|
|
|
BlockAcctStats *blk_get_stats(BlockBackend *blk)
|
|
{
|
|
return bdrv_get_stats(blk->bs);
|
|
}
|
|
|
|
void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque);
|
|
}
|
|
|
|
int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num,
|
|
int nb_sectors, BdrvRequestFlags flags)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_co_write_zeroes(blk->bs, sector_num, nb_sectors, flags);
|
|
}
|
|
|
|
int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_write_compressed(blk->bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
int blk_truncate(BlockBackend *blk, int64_t offset)
|
|
{
|
|
return bdrv_truncate(blk->bs, offset);
|
|
}
|
|
|
|
int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
|
|
{
|
|
int ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_discard(blk->bs, sector_num, nb_sectors);
|
|
}
|
|
|
|
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
return bdrv_save_vmstate(blk->bs, buf, pos, size);
|
|
}
|
|
|
|
int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
|
|
{
|
|
return bdrv_load_vmstate(blk->bs, buf, pos, size);
|
|
}
|