7fa84cd8d4
Commit 57d6a428 broke blk_aio_write_zeroes() because in some write
functions in the call path don't have an explicit length argument but
reuse qiov->size instead. Which is great, except that write_zeroes
doesn't have a qiov, which this commit interprets as 0 bytes.
Consequently, blk_aio_write_zeroes() didn't effectively do anything.
This patch introduces an explicit acb->bytes in BlkAioEmAIOCB and uses
that instead of acb->rwco.size.
The synchronous version of the function is okay because it does pass a
qiov (with the right size and a NULL pointer as its base).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
1635 lines
41 KiB
C
1635 lines
41 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 "qemu/osdep.h"
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#include "sysemu/block-backend.h"
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#include "block/block_int.h"
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#include "block/blockjob.h"
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#include "block/throttle-groups.h"
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#include "sysemu/blockdev.h"
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#include "sysemu/sysemu.h"
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#include "qapi-event.h"
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#include "qemu/id.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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#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
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static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb);
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struct BlockBackend {
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char *name;
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int refcnt;
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BdrvChild *root;
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DriveInfo *legacy_dinfo; /* null unless created by drive_new() */
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QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */
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QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_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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/* the block size for which the guest device expects atomicity */
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int guest_block_size;
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/* If the BDS tree is removed, some of its options are stored here (which
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* can be used to restore those options in the new BDS on insert) */
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BlockBackendRootState root_state;
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bool enable_write_cache;
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/* I/O stats (display with "info blockstats"). */
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BlockAcctStats stats;
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BlockdevOnError on_read_error, on_write_error;
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bool iostatus_enabled;
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BlockDeviceIoStatus iostatus;
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bool allow_write_beyond_eof;
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NotifierList remove_bs_notifiers, insert_bs_notifiers;
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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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BlockBackend *blk;
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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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.get_aio_context = blk_aiocb_get_aio_context,
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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 BlockBackends */
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static QTAILQ_HEAD(, BlockBackend) block_backends =
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QTAILQ_HEAD_INITIALIZER(block_backends);
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/* All BlockBackends referenced by the monitor and which are iterated through by
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* blk_next() */
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static QTAILQ_HEAD(, BlockBackend) monitor_block_backends =
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QTAILQ_HEAD_INITIALIZER(monitor_block_backends);
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static void blk_root_inherit_options(int *child_flags, QDict *child_options,
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int parent_flags, QDict *parent_options)
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{
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/* We're not supposed to call this function for root nodes */
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abort();
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}
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static const BdrvChildRole child_root = {
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.inherit_options = blk_root_inherit_options,
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};
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/*
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* Create a new BlockBackend with a reference count of one.
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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(Error **errp)
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{
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BlockBackend *blk;
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blk = g_new0(BlockBackend, 1);
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blk->refcnt = 1;
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notifier_list_init(&blk->remove_bs_notifiers);
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notifier_list_init(&blk->insert_bs_notifiers);
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QTAILQ_INSERT_TAIL(&block_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(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(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->root = bdrv_root_attach_child(bs, "root", &child_root);
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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 *filename, const char *reference,
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QDict *options, int flags, 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(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->root->bs, filename, reference, options, flags, 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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blk_set_enable_write_cache(blk, true);
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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->name);
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assert(!blk->dev);
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if (blk->root) {
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blk_remove_bs(blk);
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}
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assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers));
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assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers));
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if (blk->root_state.throttle_state) {
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g_free(blk->root_state.throttle_group);
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throttle_group_unref(blk->root_state.throttle_state);
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}
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QTAILQ_REMOVE(&block_backends, blk, link);
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drive_info_del(blk->legacy_dinfo);
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block_acct_cleanup(&blk->stats);
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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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int blk_get_refcnt(BlockBackend *blk)
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{
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return blk ? blk->refcnt : 0;
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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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* Behaves similarly to blk_next() but iterates over all BlockBackends, even the
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* ones which are hidden (i.e. are not referenced by the monitor).
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*/
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static BlockBackend *blk_all_next(BlockBackend *blk)
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{
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return blk ? QTAILQ_NEXT(blk, link)
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: QTAILQ_FIRST(&block_backends);
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}
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void blk_remove_all_bs(void)
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{
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BlockBackend *blk = NULL;
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while ((blk = blk_all_next(blk)) != NULL) {
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AioContext *ctx = blk_get_aio_context(blk);
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aio_context_acquire(ctx);
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if (blk->root) {
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blk_remove_bs(blk);
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}
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aio_context_release(ctx);
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}
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}
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/*
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* Return the monitor-owned 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, monitor_link)
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: QTAILQ_FIRST(&monitor_block_backends);
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}
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/*
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* Iterates over all BlockDriverStates which are attached to a BlockBackend.
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* This function is for use by bdrv_next().
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*
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* @bs must be NULL or a BDS that is attached to a BB.
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*/
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BlockDriverState *blk_next_root_bs(BlockDriverState *bs)
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{
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BlockBackend *blk;
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if (bs) {
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assert(bs->blk);
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blk = bs->blk;
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} else {
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blk = NULL;
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}
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do {
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blk = blk_all_next(blk);
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} while (blk && !blk->root);
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return blk ? blk->root->bs : NULL;
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}
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/*
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* Add a BlockBackend into the list of backends referenced by the monitor, with
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* the given @name acting as the handle for the monitor.
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* Strictly for use by blockdev.c.
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*
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* @name must not be null or empty.
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*
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* Returns true on success and false on failure. In the latter case, an Error
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* object is returned through @errp.
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*/
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bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp)
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{
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assert(!blk->name);
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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 false;
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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 false;
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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 false;
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}
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blk->name = g_strdup(name);
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QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link);
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return true;
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}
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/*
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* Remove a BlockBackend from the list of backends referenced by the monitor.
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* Strictly for use by blockdev.c.
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*/
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void monitor_remove_blk(BlockBackend *blk)
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{
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if (!blk->name) {
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return;
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}
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QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link);
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g_free(blk->name);
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blk->name = NULL;
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}
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/*
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* Return @blk's name, a non-null string.
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* Returns an empty string iff @blk is not referenced by the monitor.
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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 = NULL;
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assert(name);
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while ((blk = blk_next(blk)) != NULL) {
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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->root ? blk->root->bs : NULL;
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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 = NULL;
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while ((blk = blk_next(blk)) != NULL) {
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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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* Disassociates the currently associated BlockDriverState from @blk.
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*/
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void blk_remove_bs(BlockBackend *blk)
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{
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assert(blk->root->bs->blk == blk);
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notifier_list_notify(&blk->remove_bs_notifiers, blk);
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blk_update_root_state(blk);
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blk->root->bs->blk = NULL;
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bdrv_root_unref_child(blk->root);
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blk->root = NULL;
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}
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/*
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* Associates a new BlockDriverState with @blk.
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*/
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void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
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{
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assert(!blk->root && !bs->blk);
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bdrv_ref(bs);
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blk->root = bdrv_root_attach_child(bs, "root", &child_root);
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bs->blk = blk;
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notifier_list_notify(&blk->insert_bs_notifiers, blk);
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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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blk_iostatus_reset(blk);
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return 0;
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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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* @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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/*
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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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blk->guest_block_size = 512;
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blk_unref(blk);
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}
|
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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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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.
|
|
* @opaque is the opaque argument to pass to the callbacks.
|
|
* This is for use by device models.
|
|
*/
|
|
void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
|
|
void *opaque)
|
|
{
|
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blk->dev_ops = ops;
|
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blk->dev_opaque = opaque;
|
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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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void blk_dev_change_media_cb(BlockBackend *blk, bool load)
|
|
{
|
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if (blk->dev_ops && blk->dev_ops->change_media_cb) {
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bool tray_was_open, tray_is_open;
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|
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tray_was_open = blk_dev_is_tray_open(blk);
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blk->dev_ops->change_media_cb(blk->dev_opaque, load);
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tray_is_open = blk_dev_is_tray_open(blk);
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|
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if (tray_was_open != tray_is_open) {
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qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open,
|
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&error_abort);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Does @blk's attached device model have removable media?
|
|
* %true if no device model is attached.
|
|
*/
|
|
bool blk_dev_has_removable_media(BlockBackend *blk)
|
|
{
|
|
return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb);
|
|
}
|
|
|
|
/*
|
|
* Does @blk's attached device model have a tray?
|
|
*/
|
|
bool blk_dev_has_tray(BlockBackend *blk)
|
|
{
|
|
return blk->dev_ops && blk->dev_ops->is_tray_open;
|
|
}
|
|
|
|
/*
|
|
* Notify @blk's attached device model of a media eject request.
|
|
* If @force is true, the medium is about to be yanked out forcefully.
|
|
*/
|
|
void blk_dev_eject_request(BlockBackend *blk, bool force)
|
|
{
|
|
if (blk->dev_ops && blk->dev_ops->eject_request_cb) {
|
|
blk->dev_ops->eject_request_cb(blk->dev_opaque, force);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Does @blk's attached device model have a tray, and is it open?
|
|
*/
|
|
bool blk_dev_is_tray_open(BlockBackend *blk)
|
|
{
|
|
if (blk_dev_has_tray(blk)) {
|
|
return blk->dev_ops->is_tray_open(blk->dev_opaque);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Does @blk's attached device model have the medium locked?
|
|
* %false if the device model has no such lock.
|
|
*/
|
|
bool blk_dev_is_medium_locked(BlockBackend *blk)
|
|
{
|
|
if (blk->dev_ops && blk->dev_ops->is_medium_locked) {
|
|
return blk->dev_ops->is_medium_locked(blk->dev_opaque);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Notify @blk's attached device model of a backend size change.
|
|
*/
|
|
void blk_dev_resize_cb(BlockBackend *blk)
|
|
{
|
|
if (blk->dev_ops && blk->dev_ops->resize_cb) {
|
|
blk->dev_ops->resize_cb(blk->dev_opaque);
|
|
}
|
|
}
|
|
|
|
void blk_iostatus_enable(BlockBackend *blk)
|
|
{
|
|
blk->iostatus_enabled = true;
|
|
blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
|
|
}
|
|
|
|
/* The I/O status is only enabled if the drive explicitly
|
|
* enables it _and_ the VM is configured to stop on errors */
|
|
bool blk_iostatus_is_enabled(const BlockBackend *blk)
|
|
{
|
|
return (blk->iostatus_enabled &&
|
|
(blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
|
|
blk->on_write_error == BLOCKDEV_ON_ERROR_STOP ||
|
|
blk->on_read_error == BLOCKDEV_ON_ERROR_STOP));
|
|
}
|
|
|
|
BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk)
|
|
{
|
|
return blk->iostatus;
|
|
}
|
|
|
|
void blk_iostatus_disable(BlockBackend *blk)
|
|
{
|
|
blk->iostatus_enabled = false;
|
|
}
|
|
|
|
void blk_iostatus_reset(BlockBackend *blk)
|
|
{
|
|
if (blk_iostatus_is_enabled(blk)) {
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
|
|
if (bs && bs->job) {
|
|
block_job_iostatus_reset(bs->job);
|
|
}
|
|
}
|
|
}
|
|
|
|
void blk_iostatus_set_err(BlockBackend *blk, int error)
|
|
{
|
|
assert(blk_iostatus_is_enabled(blk));
|
|
if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
|
|
blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
|
|
BLOCK_DEVICE_IO_STATUS_FAILED;
|
|
}
|
|
}
|
|
|
|
void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow)
|
|
{
|
|
blk->allow_write_beyond_eof = allow;
|
|
}
|
|
|
|
static int blk_check_byte_request(BlockBackend *blk, int64_t offset,
|
|
size_t size)
|
|
{
|
|
int64_t len;
|
|
|
|
if (size > INT_MAX) {
|
|
return -EIO;
|
|
}
|
|
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
if (offset < 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
if (!blk->allow_write_beyond_eof) {
|
|
len = blk_getlength(blk);
|
|
if (len < 0) {
|
|
return len;
|
|
}
|
|
|
|
if (offset > len || len - offset < size) {
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int blk_check_request(BlockBackend *blk, int64_t sector_num,
|
|
int nb_sectors)
|
|
{
|
|
if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) {
|
|
return -EIO;
|
|
}
|
|
|
|
if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
|
|
return -EIO;
|
|
}
|
|
|
|
return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE,
|
|
nb_sectors * BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
|
|
unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret = blk_check_byte_request(blk, offset, bytes);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_co_do_preadv(blk_bs(blk), offset, bytes, qiov, flags);
|
|
}
|
|
|
|
static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
|
|
unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret;
|
|
|
|
ret = blk_check_byte_request(blk, offset, bytes);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (!blk->enable_write_cache) {
|
|
flags |= BDRV_REQ_FUA;
|
|
}
|
|
|
|
return bdrv_co_do_pwritev(blk_bs(blk), offset, bytes, qiov, flags);
|
|
}
|
|
|
|
typedef struct BlkRwCo {
|
|
BlockBackend *blk;
|
|
int64_t offset;
|
|
QEMUIOVector *qiov;
|
|
int ret;
|
|
BdrvRequestFlags flags;
|
|
} BlkRwCo;
|
|
|
|
static void blk_read_entry(void *opaque)
|
|
{
|
|
BlkRwCo *rwco = opaque;
|
|
|
|
rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size,
|
|
rwco->qiov, rwco->flags);
|
|
}
|
|
|
|
static void blk_write_entry(void *opaque)
|
|
{
|
|
BlkRwCo *rwco = opaque;
|
|
|
|
rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size,
|
|
rwco->qiov, rwco->flags);
|
|
}
|
|
|
|
static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf,
|
|
int64_t bytes, CoroutineEntry co_entry,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
AioContext *aio_context;
|
|
QEMUIOVector qiov;
|
|
struct iovec iov;
|
|
Coroutine *co;
|
|
BlkRwCo rwco;
|
|
|
|
iov = (struct iovec) {
|
|
.iov_base = buf,
|
|
.iov_len = bytes,
|
|
};
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
|
|
rwco = (BlkRwCo) {
|
|
.blk = blk,
|
|
.offset = offset,
|
|
.qiov = &qiov,
|
|
.flags = flags,
|
|
.ret = NOT_DONE,
|
|
};
|
|
|
|
co = qemu_coroutine_create(co_entry);
|
|
qemu_coroutine_enter(co, &rwco);
|
|
|
|
aio_context = blk_get_aio_context(blk);
|
|
while (rwco.ret == NOT_DONE) {
|
|
aio_poll(aio_context, true);
|
|
}
|
|
|
|
return rwco.ret;
|
|
}
|
|
|
|
static int blk_rw(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
|
|
int nb_sectors, CoroutineEntry co_entry,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return blk_prw(blk, sector_num << BDRV_SECTOR_BITS, buf,
|
|
nb_sectors << BDRV_SECTOR_BITS, co_entry, flags);
|
|
}
|
|
|
|
int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
|
|
int nb_sectors)
|
|
{
|
|
return blk_rw(blk, sector_num, buf, nb_sectors, blk_read_entry, 0);
|
|
}
|
|
|
|
int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
|
|
int nb_sectors)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
bool enabled;
|
|
int ret;
|
|
|
|
ret = blk_check_request(blk, sector_num, nb_sectors);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
enabled = bs->io_limits_enabled;
|
|
bs->io_limits_enabled = false;
|
|
ret = blk_read(blk, sector_num, buf, nb_sectors);
|
|
bs->io_limits_enabled = enabled;
|
|
return ret;
|
|
}
|
|
|
|
int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
|
|
int nb_sectors)
|
|
{
|
|
return blk_rw(blk, sector_num, (uint8_t*) buf, nb_sectors,
|
|
blk_write_entry, 0);
|
|
}
|
|
|
|
int blk_write_zeroes(BlockBackend *blk, int64_t sector_num,
|
|
int nb_sectors, BdrvRequestFlags flags)
|
|
{
|
|
return blk_rw(blk, sector_num, NULL, nb_sectors, blk_write_entry,
|
|
BDRV_REQ_ZERO_WRITE);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
BlockAIOCB *blk_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->blk = blk;
|
|
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;
|
|
}
|
|
|
|
typedef struct BlkAioEmAIOCB {
|
|
BlockAIOCB common;
|
|
BlkRwCo rwco;
|
|
int bytes;
|
|
bool has_returned;
|
|
QEMUBH* bh;
|
|
} BlkAioEmAIOCB;
|
|
|
|
static const AIOCBInfo blk_aio_em_aiocb_info = {
|
|
.aiocb_size = sizeof(BlkAioEmAIOCB),
|
|
};
|
|
|
|
static void blk_aio_complete(BlkAioEmAIOCB *acb)
|
|
{
|
|
if (acb->bh) {
|
|
assert(acb->has_returned);
|
|
qemu_bh_delete(acb->bh);
|
|
}
|
|
if (acb->has_returned) {
|
|
acb->common.cb(acb->common.opaque, acb->rwco.ret);
|
|
qemu_aio_unref(acb);
|
|
}
|
|
}
|
|
|
|
static void blk_aio_complete_bh(void *opaque)
|
|
{
|
|
blk_aio_complete(opaque);
|
|
}
|
|
|
|
static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes,
|
|
QEMUIOVector *qiov, CoroutineEntry co_entry,
|
|
BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb;
|
|
Coroutine *co;
|
|
|
|
acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque);
|
|
acb->rwco = (BlkRwCo) {
|
|
.blk = blk,
|
|
.offset = offset,
|
|
.qiov = qiov,
|
|
.flags = flags,
|
|
.ret = NOT_DONE,
|
|
};
|
|
acb->bytes = bytes;
|
|
acb->bh = NULL;
|
|
acb->has_returned = false;
|
|
|
|
co = qemu_coroutine_create(co_entry);
|
|
qemu_coroutine_enter(co, acb);
|
|
|
|
acb->has_returned = true;
|
|
if (acb->rwco.ret != NOT_DONE) {
|
|
acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb);
|
|
qemu_bh_schedule(acb->bh);
|
|
}
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
static void blk_aio_read_entry(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
BlkRwCo *rwco = &acb->rwco;
|
|
|
|
assert(rwco->qiov->size == acb->bytes);
|
|
rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes,
|
|
rwco->qiov, rwco->flags);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
static void blk_aio_write_entry(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
BlkRwCo *rwco = &acb->rwco;
|
|
|
|
assert(!rwco->qiov || rwco->qiov->size == acb->bytes);
|
|
rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes,
|
|
rwco->qiov, rwco->flags);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
|
|
int nb_sectors, BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
|
|
}
|
|
|
|
return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS,
|
|
nb_sectors << BDRV_SECTOR_BITS, NULL,
|
|
blk_aio_write_entry, BDRV_REQ_ZERO_WRITE, cb, opaque);
|
|
}
|
|
|
|
int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count)
|
|
{
|
|
int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count)
|
|
{
|
|
int ret = blk_prw(blk, offset, (void*) buf, count, blk_write_entry, 0);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
int64_t blk_getlength(BlockBackend *blk)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_getlength(blk_bs(blk));
|
|
}
|
|
|
|
void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
|
|
{
|
|
if (!blk_bs(blk)) {
|
|
*nb_sectors_ptr = 0;
|
|
} else {
|
|
bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr);
|
|
}
|
|
}
|
|
|
|
int64_t blk_nb_sectors(BlockBackend *blk)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_nb_sectors(blk_bs(blk));
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
|
|
QEMUIOVector *iov, int nb_sectors,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
|
|
}
|
|
|
|
assert(nb_sectors << BDRV_SECTOR_BITS == iov->size);
|
|
return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov,
|
|
blk_aio_read_entry, 0, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
|
|
QEMUIOVector *iov, int nb_sectors,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return blk_abort_aio_request(blk, cb, opaque, -EINVAL);
|
|
}
|
|
|
|
assert(nb_sectors << BDRV_SECTOR_BITS == iov->size);
|
|
return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov,
|
|
blk_aio_write_entry, 0, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_flush(BlockBackend *blk,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
|
|
}
|
|
|
|
return bdrv_aio_flush(blk_bs(blk), 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 blk_abort_aio_request(blk, cb, opaque, ret);
|
|
}
|
|
|
|
return bdrv_aio_discard(blk_bs(blk), 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(blk), reqs, num_reqs);
|
|
}
|
|
|
|
int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_ioctl(blk_bs(blk), req, buf);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM);
|
|
}
|
|
|
|
return bdrv_aio_ioctl(blk_bs(blk), 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(blk), sector_num, nb_sectors);
|
|
}
|
|
|
|
int blk_co_flush(BlockBackend *blk)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_co_flush(blk_bs(blk));
|
|
}
|
|
|
|
int blk_flush(BlockBackend *blk)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_flush(blk_bs(blk));
|
|
}
|
|
|
|
void blk_drain(BlockBackend *blk)
|
|
{
|
|
if (blk_bs(blk)) {
|
|
bdrv_drain(blk_bs(blk));
|
|
}
|
|
}
|
|
|
|
void blk_drain_all(void)
|
|
{
|
|
bdrv_drain_all();
|
|
}
|
|
|
|
void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
|
|
BlockdevOnError on_write_error)
|
|
{
|
|
blk->on_read_error = on_read_error;
|
|
blk->on_write_error = on_write_error;
|
|
}
|
|
|
|
BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read)
|
|
{
|
|
return is_read ? blk->on_read_error : blk->on_write_error;
|
|
}
|
|
|
|
BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
|
|
int error)
|
|
{
|
|
BlockdevOnError on_err = blk_get_on_error(blk, is_read);
|
|
|
|
switch (on_err) {
|
|
case BLOCKDEV_ON_ERROR_ENOSPC:
|
|
return (error == ENOSPC) ?
|
|
BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
|
|
case BLOCKDEV_ON_ERROR_STOP:
|
|
return BLOCK_ERROR_ACTION_STOP;
|
|
case BLOCKDEV_ON_ERROR_REPORT:
|
|
return BLOCK_ERROR_ACTION_REPORT;
|
|
case BLOCKDEV_ON_ERROR_IGNORE:
|
|
return BLOCK_ERROR_ACTION_IGNORE;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
static void send_qmp_error_event(BlockBackend *blk,
|
|
BlockErrorAction action,
|
|
bool is_read, int error)
|
|
{
|
|
IoOperationType optype;
|
|
|
|
optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE;
|
|
qapi_event_send_block_io_error(blk_name(blk), optype, action,
|
|
blk_iostatus_is_enabled(blk),
|
|
error == ENOSPC, strerror(error),
|
|
&error_abort);
|
|
}
|
|
|
|
/* This is done by device models because, while the block layer knows
|
|
* about the error, it does not know whether an operation comes from
|
|
* the device or the block layer (from a job, for example).
|
|
*/
|
|
void blk_error_action(BlockBackend *blk, BlockErrorAction action,
|
|
bool is_read, int error)
|
|
{
|
|
assert(error >= 0);
|
|
|
|
if (action == BLOCK_ERROR_ACTION_STOP) {
|
|
/* First set the iostatus, so that "info block" returns an iostatus
|
|
* that matches the events raised so far (an additional error iostatus
|
|
* is fine, but not a lost one).
|
|
*/
|
|
blk_iostatus_set_err(blk, error);
|
|
|
|
/* Then raise the request to stop the VM and the event.
|
|
* qemu_system_vmstop_request_prepare has two effects. First,
|
|
* it ensures that the STOP event always comes after the
|
|
* BLOCK_IO_ERROR event. Second, it ensures that even if management
|
|
* can observe the STOP event and do a "cont" before the STOP
|
|
* event is issued, the VM will not stop. In this case, vm_start()
|
|
* also ensures that the STOP/RESUME pair of events is emitted.
|
|
*/
|
|
qemu_system_vmstop_request_prepare();
|
|
send_qmp_error_event(blk, action, is_read, error);
|
|
qemu_system_vmstop_request(RUN_STATE_IO_ERROR);
|
|
} else {
|
|
send_qmp_error_event(blk, action, is_read, error);
|
|
}
|
|
}
|
|
|
|
int blk_is_read_only(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
return bdrv_is_read_only(bs);
|
|
} else {
|
|
return blk->root_state.read_only;
|
|
}
|
|
}
|
|
|
|
int blk_is_sg(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (!bs) {
|
|
return 0;
|
|
}
|
|
|
|
return bdrv_is_sg(bs);
|
|
}
|
|
|
|
int blk_enable_write_cache(BlockBackend *blk)
|
|
{
|
|
return blk->enable_write_cache;
|
|
}
|
|
|
|
void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
|
|
{
|
|
blk->enable_write_cache = wce;
|
|
}
|
|
|
|
void blk_invalidate_cache(BlockBackend *blk, Error **errp)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (!bs) {
|
|
error_setg(errp, "Device '%s' has no medium", blk->name);
|
|
return;
|
|
}
|
|
|
|
bdrv_invalidate_cache(bs, errp);
|
|
}
|
|
|
|
bool blk_is_inserted(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
return bs && bdrv_is_inserted(bs);
|
|
}
|
|
|
|
bool blk_is_available(BlockBackend *blk)
|
|
{
|
|
return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk);
|
|
}
|
|
|
|
void blk_lock_medium(BlockBackend *blk, bool locked)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_lock_medium(bs, locked);
|
|
}
|
|
}
|
|
|
|
void blk_eject(BlockBackend *blk, bool eject_flag)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_eject(bs, eject_flag);
|
|
}
|
|
}
|
|
|
|
int blk_get_flags(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
return bdrv_get_flags(bs);
|
|
} else {
|
|
return blk->root_state.open_flags;
|
|
}
|
|
}
|
|
|
|
int blk_get_max_transfer_length(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
return bs->bl.max_transfer_length;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int blk_get_max_iov(BlockBackend *blk)
|
|
{
|
|
return blk->root->bs->bl.max_iov;
|
|
}
|
|
|
|
void blk_set_guest_block_size(BlockBackend *blk, int align)
|
|
{
|
|
blk->guest_block_size = align;
|
|
}
|
|
|
|
void *blk_try_blockalign(BlockBackend *blk, size_t size)
|
|
{
|
|
return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size);
|
|
}
|
|
|
|
void *blk_blockalign(BlockBackend *blk, size_t size)
|
|
{
|
|
return qemu_blockalign(blk ? blk_bs(blk) : NULL, size);
|
|
}
|
|
|
|
bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (!bs) {
|
|
return false;
|
|
}
|
|
|
|
return bdrv_op_is_blocked(bs, op, errp);
|
|
}
|
|
|
|
void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_op_unblock(bs, op, reason);
|
|
}
|
|
}
|
|
|
|
void blk_op_block_all(BlockBackend *blk, Error *reason)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_op_block_all(bs, reason);
|
|
}
|
|
}
|
|
|
|
void blk_op_unblock_all(BlockBackend *blk, Error *reason)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_op_unblock_all(bs, reason);
|
|
}
|
|
}
|
|
|
|
AioContext *blk_get_aio_context(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
return bdrv_get_aio_context(bs);
|
|
} else {
|
|
return qemu_get_aio_context();
|
|
}
|
|
}
|
|
|
|
static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb)
|
|
{
|
|
BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb);
|
|
return blk_get_aio_context(blk_acb->blk);
|
|
}
|
|
|
|
void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_set_aio_context(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)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_add_aio_context_notifier(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)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_remove_aio_context_notifier(bs, attached_aio_context,
|
|
detach_aio_context, opaque);
|
|
}
|
|
}
|
|
|
|
void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify)
|
|
{
|
|
notifier_list_add(&blk->remove_bs_notifiers, notify);
|
|
}
|
|
|
|
void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify)
|
|
{
|
|
notifier_list_add(&blk->insert_bs_notifiers, notify);
|
|
}
|
|
|
|
void blk_io_plug(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_io_plug(bs);
|
|
}
|
|
}
|
|
|
|
void blk_io_unplug(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
if (bs) {
|
|
bdrv_io_unplug(bs);
|
|
}
|
|
}
|
|
|
|
BlockAcctStats *blk_get_stats(BlockBackend *blk)
|
|
{
|
|
return &blk->stats;
|
|
}
|
|
|
|
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)
|
|
{
|
|
if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return blk_co_pwritev(blk, sector_num << BDRV_SECTOR_BITS,
|
|
nb_sectors << BDRV_SECTOR_BITS, NULL,
|
|
BDRV_REQ_ZERO_WRITE);
|
|
}
|
|
|
|
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(blk), sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
int blk_truncate(BlockBackend *blk, int64_t offset)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_truncate(blk_bs(blk), 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(blk), sector_num, nb_sectors);
|
|
}
|
|
|
|
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
int ret;
|
|
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (ret == size && !blk->enable_write_cache) {
|
|
ret = bdrv_flush(blk_bs(blk));
|
|
}
|
|
|
|
return ret < 0 ? ret : size;
|
|
}
|
|
|
|
int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_load_vmstate(blk_bs(blk), buf, pos, size);
|
|
}
|
|
|
|
int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_probe_blocksizes(blk_bs(blk), bsz);
|
|
}
|
|
|
|
int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_probe_geometry(blk_bs(blk), geo);
|
|
}
|
|
|
|
/*
|
|
* Updates the BlockBackendRootState object with data from the currently
|
|
* attached BlockDriverState.
|
|
*/
|
|
void blk_update_root_state(BlockBackend *blk)
|
|
{
|
|
assert(blk->root);
|
|
|
|
blk->root_state.open_flags = blk->root->bs->open_flags;
|
|
blk->root_state.read_only = blk->root->bs->read_only;
|
|
blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes;
|
|
|
|
if (blk->root_state.throttle_group) {
|
|
g_free(blk->root_state.throttle_group);
|
|
throttle_group_unref(blk->root_state.throttle_state);
|
|
}
|
|
if (blk->root->bs->throttle_state) {
|
|
const char *name = throttle_group_get_name(blk->root->bs);
|
|
blk->root_state.throttle_group = g_strdup(name);
|
|
blk->root_state.throttle_state = throttle_group_incref(name);
|
|
} else {
|
|
blk->root_state.throttle_group = NULL;
|
|
blk->root_state.throttle_state = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Applies the information in the root state to the given BlockDriverState. This
|
|
* does not include the flags which have to be specified for bdrv_open(), use
|
|
* blk_get_open_flags_from_root_state() to inquire them.
|
|
*/
|
|
void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs)
|
|
{
|
|
bs->detect_zeroes = blk->root_state.detect_zeroes;
|
|
if (blk->root_state.throttle_group) {
|
|
bdrv_io_limits_enable(bs, blk->root_state.throttle_group);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns the flags to be used for bdrv_open() of a BlockDriverState which is
|
|
* supposed to inherit the root state.
|
|
*/
|
|
int blk_get_open_flags_from_root_state(BlockBackend *blk)
|
|
{
|
|
int bs_flags;
|
|
|
|
bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR;
|
|
bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR;
|
|
|
|
return bs_flags;
|
|
}
|
|
|
|
BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
|
|
{
|
|
return &blk->root_state;
|
|
}
|
|
|
|
int blk_commit_all(void)
|
|
{
|
|
BlockBackend *blk = NULL;
|
|
|
|
while ((blk = blk_all_next(blk)) != NULL) {
|
|
AioContext *aio_context = blk_get_aio_context(blk);
|
|
|
|
aio_context_acquire(aio_context);
|
|
if (blk_is_inserted(blk) && blk->root->bs->backing) {
|
|
int ret = bdrv_commit(blk->root->bs);
|
|
if (ret < 0) {
|
|
aio_context_release(aio_context);
|
|
return ret;
|
|
}
|
|
}
|
|
aio_context_release(aio_context);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int blk_flush_all(void)
|
|
{
|
|
BlockBackend *blk = NULL;
|
|
int result = 0;
|
|
|
|
while ((blk = blk_all_next(blk)) != NULL) {
|
|
AioContext *aio_context = blk_get_aio_context(blk);
|
|
int ret;
|
|
|
|
aio_context_acquire(aio_context);
|
|
if (blk_is_inserted(blk)) {
|
|
ret = blk_flush(blk);
|
|
if (ret < 0 && !result) {
|
|
result = ret;
|
|
}
|
|
}
|
|
aio_context_release(aio_context);
|
|
}
|
|
|
|
return result;
|
|
}
|