501 lines
11 KiB
C
501 lines
11 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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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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};
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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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static void blk_delete(BlockBackend *blk)
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{
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assert(!blk->refcnt);
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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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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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int blk_attach_dev(BlockBackend *blk, void *dev)
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{
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return bdrv_attach_dev(blk->bs, dev);
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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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bdrv_attach_dev_nofail(blk->bs, dev);
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}
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void blk_detach_dev(BlockBackend *blk, void *dev)
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{
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bdrv_detach_dev(blk->bs, dev);
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}
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void *blk_get_attached_dev(BlockBackend *blk)
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{
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return bdrv_get_attached_dev(blk->bs);
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}
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void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque)
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{
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bdrv_set_dev_ops(blk->bs, ops, opaque);
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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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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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{
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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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return bdrv_write(blk->bs, sector_num, buf, nb_sectors);
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}
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BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags,
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cb, opaque);
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}
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int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count)
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{
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return bdrv_pread(blk->bs, offset, buf, count);
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}
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int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count)
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{
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return bdrv_pwrite(blk->bs, offset, buf, count);
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}
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int64_t blk_getlength(BlockBackend *blk)
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{
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return bdrv_getlength(blk->bs);
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}
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void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
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{
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bdrv_get_geometry(blk->bs, nb_sectors_ptr);
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}
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BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
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}
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BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque);
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}
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BlockAIOCB *blk_aio_flush(BlockBackend *blk,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_flush(blk->bs, cb, opaque);
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}
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BlockAIOCB *blk_aio_discard(BlockBackend *blk,
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int64_t sector_num, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque);
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}
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void blk_aio_cancel(BlockAIOCB *acb)
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{
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bdrv_aio_cancel(acb);
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}
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void blk_aio_cancel_async(BlockAIOCB *acb)
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{
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bdrv_aio_cancel_async(acb);
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}
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int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs)
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{
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return bdrv_aio_multiwrite(blk->bs, reqs, num_reqs);
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}
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int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
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{
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return bdrv_ioctl(blk->bs, req, buf);
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}
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BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
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BlockCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque);
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}
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int blk_flush(BlockBackend *blk)
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{
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return bdrv_flush(blk->bs);
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}
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int blk_flush_all(void)
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{
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return bdrv_flush_all();
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}
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void blk_drain_all(void)
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{
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bdrv_drain_all();
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}
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BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read)
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{
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return bdrv_get_on_error(blk->bs, is_read);
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}
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BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
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int error)
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{
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return bdrv_get_error_action(blk->bs, is_read, error);
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}
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void blk_error_action(BlockBackend *blk, BlockErrorAction action,
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bool is_read, int error)
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{
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bdrv_error_action(blk->bs, action, is_read, error);
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}
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int blk_is_read_only(BlockBackend *blk)
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{
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return bdrv_is_read_only(blk->bs);
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}
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int blk_is_sg(BlockBackend *blk)
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{
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return bdrv_is_sg(blk->bs);
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}
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int blk_enable_write_cache(BlockBackend *blk)
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{
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return bdrv_enable_write_cache(blk->bs);
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}
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void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
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{
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bdrv_set_enable_write_cache(blk->bs, wce);
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}
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int blk_is_inserted(BlockBackend *blk)
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{
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return bdrv_is_inserted(blk->bs);
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}
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void blk_lock_medium(BlockBackend *blk, bool locked)
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{
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bdrv_lock_medium(blk->bs, locked);
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}
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void blk_eject(BlockBackend *blk, bool eject_flag)
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{
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bdrv_eject(blk->bs, eject_flag);
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}
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int blk_get_flags(BlockBackend *blk)
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{
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return bdrv_get_flags(blk->bs);
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}
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void blk_set_guest_block_size(BlockBackend *blk, int align)
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{
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bdrv_set_guest_block_size(blk->bs, align);
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}
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void *blk_blockalign(BlockBackend *blk, size_t size)
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{
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return qemu_blockalign(blk ? blk->bs : NULL, size);
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}
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bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
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{
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return bdrv_op_is_blocked(blk->bs, op, errp);
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}
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void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
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{
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bdrv_op_unblock(blk->bs, op, reason);
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}
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void blk_op_block_all(BlockBackend *blk, Error *reason)
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{
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bdrv_op_block_all(blk->bs, reason);
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}
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void blk_op_unblock_all(BlockBackend *blk, Error *reason)
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{
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bdrv_op_unblock_all(blk->bs, reason);
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}
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AioContext *blk_get_aio_context(BlockBackend *blk)
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{
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return bdrv_get_aio_context(blk->bs);
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}
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void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
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{
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bdrv_set_aio_context(blk->bs, new_context);
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}
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void blk_io_plug(BlockBackend *blk)
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{
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bdrv_io_plug(blk->bs);
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}
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void blk_io_unplug(BlockBackend *blk)
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{
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bdrv_io_unplug(blk->bs);
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}
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BlockAcctStats *blk_get_stats(BlockBackend *blk)
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{
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return bdrv_get_stats(blk->bs);
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}
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void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
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BlockCompletionFunc *cb, void *opaque)
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{
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return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque);
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}
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