mirror of https://github.com/proxmox/mirror_qemu
1949 lines
49 KiB
C
1949 lines
49 KiB
C
/*
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* QEMU Block backends
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*
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* Copyright (C) 2014-2016 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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#include "trace.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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BlockBackendPublic public;
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void *dev; /* attached device model, if any */
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bool legacy_dev; /* true if dev is not a DeviceState */
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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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uint64_t perm;
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uint64_t shared_perm;
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bool disable_perm;
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bool allow_write_beyond_eof;
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NotifierList remove_bs_notifiers, insert_bs_notifiers;
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int quiesce_counter;
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};
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typedef struct BlockBackendAIOCB {
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BlockAIOCB common;
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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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static BlockBackend *bdrv_first_blk(BlockDriverState *bs);
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static char *blk_get_attached_dev_id(BlockBackend *blk);
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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 void blk_root_drained_begin(BdrvChild *child);
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static void blk_root_drained_end(BdrvChild *child);
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static void blk_root_change_media(BdrvChild *child, bool load);
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static void blk_root_resize(BdrvChild *child);
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static char *blk_root_get_parent_desc(BdrvChild *child)
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{
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BlockBackend *blk = child->opaque;
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char *dev_id;
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if (blk->name) {
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return g_strdup(blk->name);
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}
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dev_id = blk_get_attached_dev_id(blk);
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if (*dev_id) {
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return dev_id;
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} else {
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/* TODO Callback into the BB owner for something more detailed */
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g_free(dev_id);
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return g_strdup("a block device");
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}
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}
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static const char *blk_root_get_name(BdrvChild *child)
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{
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return blk_name(child->opaque);
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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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.change_media = blk_root_change_media,
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.resize = blk_root_resize,
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.get_name = blk_root_get_name,
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.get_parent_desc = blk_root_get_parent_desc,
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.drained_begin = blk_root_drained_begin,
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.drained_end = blk_root_drained_end,
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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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*
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* @perm is a bitmasks of BLK_PERM_* constants which describes the permissions
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* to request for a block driver node that is attached to this BlockBackend.
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* @shared_perm is a bitmask which describes which permissions may be granted
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* to other users of the attached node.
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* Both sets of permissions can be changed later using blk_set_perm().
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*
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* Return the new BlockBackend on success, null on failure.
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*/
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BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm)
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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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blk->perm = perm;
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blk->shared_perm = shared_perm;
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blk_set_enable_write_cache(blk, true);
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qemu_co_queue_init(&blk->public.throttled_reqs[0]);
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qemu_co_queue_init(&blk->public.throttled_reqs[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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* Creates a new BlockBackend, opens a new BlockDriverState, and connects both.
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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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BlockDriverState *bs;
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uint64_t perm;
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/* blk_new_open() is mainly used in .bdrv_create implementations and the
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* tools where sharing isn't a concern because the BDS stays private, so we
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* just request permission according to the flags.
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*
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* The exceptions are xen_disk and blockdev_init(); in these cases, the
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* caller of blk_new_open() doesn't make use of the permissions, but they
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* shouldn't hurt either. We can still share everything here because the
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* guest devices will add their own blockers if they can't share. */
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perm = BLK_PERM_CONSISTENT_READ;
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if (flags & BDRV_O_RDWR) {
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perm |= BLK_PERM_WRITE;
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}
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if (flags & BDRV_O_RESIZE) {
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perm |= BLK_PERM_RESIZE;
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}
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blk = blk_new(perm, BLK_PERM_ALL);
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bs = bdrv_open(filename, reference, options, flags, errp);
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if (!bs) {
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blk_unref(blk);
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return NULL;
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}
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blk->root = bdrv_root_attach_child(bs, "root", &child_root,
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perm, BLK_PERM_ALL, blk, errp);
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if (!blk->root) {
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bdrv_unref(bs);
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blk_unref(blk);
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return NULL;
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}
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return blk;
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}
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static void blk_delete(BlockBackend *blk)
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{
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assert(!blk->refcnt);
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assert(!blk->name);
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assert(!blk->dev);
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if (blk->public.throttle_state) {
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blk_io_limits_disable(blk);
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}
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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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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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/* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by
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* the monitor or attached to a BlockBackend */
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BlockDriverState *bdrv_next(BdrvNextIterator *it)
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{
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BlockDriverState *bs;
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/* First, return all root nodes of BlockBackends. In order to avoid
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* returning a BDS twice when multiple BBs refer to it, we only return it
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* if the BB is the first one in the parent list of the BDS. */
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if (it->phase == BDRV_NEXT_BACKEND_ROOTS) {
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do {
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it->blk = blk_all_next(it->blk);
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bs = it->blk ? blk_bs(it->blk) : NULL;
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} while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk));
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if (bs) {
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return bs;
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}
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it->phase = BDRV_NEXT_MONITOR_OWNED;
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}
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/* Then return the monitor-owned BDSes without a BB attached. Ignore all
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* BDSes that are attached to a BlockBackend here; they have been handled
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* by the above block already */
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do {
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it->bs = bdrv_next_monitor_owned(it->bs);
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bs = it->bs;
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} while (bs && bdrv_has_blk(bs));
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return bs;
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}
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BlockDriverState *bdrv_first(BdrvNextIterator *it)
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{
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*it = (BdrvNextIterator) {
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.phase = BDRV_NEXT_BACKEND_ROOTS,
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};
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return bdrv_next(it);
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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(const 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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static BlockBackend *bdrv_first_blk(BlockDriverState *bs)
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{
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BdrvChild *child;
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QLIST_FOREACH(child, &bs->parents, next_parent) {
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if (child->role == &child_root) {
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return child->opaque;
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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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* Returns true if @bs has an associated BlockBackend.
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*/
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bool bdrv_has_blk(BlockDriverState *bs)
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{
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return bdrv_first_blk(bs) != NULL;
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}
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/*
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* Returns true if @bs has only BlockBackends as parents.
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*/
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bool bdrv_is_root_node(BlockDriverState *bs)
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{
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BdrvChild *c;
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QLIST_FOREACH(c, &bs->parents, next_parent) {
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if (c->role != &child_root) {
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return false;
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}
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}
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return true;
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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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* Returns a pointer to the publicly accessible fields of @blk.
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*/
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BlockBackendPublic *blk_get_public(BlockBackend *blk)
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{
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return &blk->public;
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}
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/*
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* Returns a BlockBackend given the associated @public fields.
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*/
|
|
BlockBackend *blk_by_public(BlockBackendPublic *public)
|
|
{
|
|
return container_of(public, BlockBackend, public);
|
|
}
|
|
|
|
/*
|
|
* Disassociates the currently associated BlockDriverState from @blk.
|
|
*/
|
|
void blk_remove_bs(BlockBackend *blk)
|
|
{
|
|
notifier_list_notify(&blk->remove_bs_notifiers, blk);
|
|
if (blk->public.throttle_state) {
|
|
throttle_timers_detach_aio_context(&blk->public.throttle_timers);
|
|
}
|
|
|
|
blk_update_root_state(blk);
|
|
|
|
bdrv_root_unref_child(blk->root);
|
|
blk->root = NULL;
|
|
}
|
|
|
|
/*
|
|
* Associates a new BlockDriverState with @blk.
|
|
*/
|
|
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
|
|
{
|
|
blk->root = bdrv_root_attach_child(bs, "root", &child_root,
|
|
blk->perm, blk->shared_perm, blk, errp);
|
|
if (blk->root == NULL) {
|
|
return -EPERM;
|
|
}
|
|
bdrv_ref(bs);
|
|
|
|
notifier_list_notify(&blk->insert_bs_notifiers, blk);
|
|
if (blk->public.throttle_state) {
|
|
throttle_timers_attach_aio_context(
|
|
&blk->public.throttle_timers, bdrv_get_aio_context(bs));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Sets the permission bitmasks that the user of the BlockBackend needs.
|
|
*/
|
|
int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
|
|
Error **errp)
|
|
{
|
|
int ret;
|
|
|
|
if (blk->root && !blk->disable_perm) {
|
|
ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
blk->perm = perm;
|
|
blk->shared_perm = shared_perm;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm)
|
|
{
|
|
*perm = blk->perm;
|
|
*shared_perm = blk->shared_perm;
|
|
}
|
|
|
|
/*
|
|
* Notifies the user of all BlockBackends that migration has completed. qdev
|
|
* devices can tighten their permissions in response (specifically revoke
|
|
* shared write permissions that we needed for storage migration).
|
|
*
|
|
* If an error is returned, the VM cannot be allowed to be resumed.
|
|
*/
|
|
void blk_resume_after_migration(Error **errp)
|
|
{
|
|
BlockBackend *blk;
|
|
Error *local_err = NULL;
|
|
|
|
for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
|
|
if (!blk->disable_perm) {
|
|
continue;
|
|
}
|
|
|
|
blk->disable_perm = false;
|
|
|
|
blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
blk->disable_perm = true;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int blk_do_attach_dev(BlockBackend *blk, void *dev)
|
|
{
|
|
if (blk->dev) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* While migration is still incoming, we don't need to apply the
|
|
* permissions of guest device BlockBackends. We might still have a block
|
|
* job or NBD server writing to the image for storage migration. */
|
|
if (runstate_check(RUN_STATE_INMIGRATE)) {
|
|
blk->disable_perm = true;
|
|
}
|
|
|
|
blk_ref(blk);
|
|
blk->dev = dev;
|
|
blk->legacy_dev = false;
|
|
blk_iostatus_reset(blk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Attach device model @dev to @blk.
|
|
* Return 0 on success, -EBUSY when a device model is attached already.
|
|
*/
|
|
int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
|
|
{
|
|
return blk_do_attach_dev(blk, dev);
|
|
}
|
|
|
|
/*
|
|
* Attach device model @dev to @blk.
|
|
* @blk must not have a device model attached already.
|
|
* TODO qdevified devices don't use this, remove when devices are qdevified
|
|
*/
|
|
void blk_attach_dev_legacy(BlockBackend *blk, void *dev)
|
|
{
|
|
if (blk_do_attach_dev(blk, dev) < 0) {
|
|
abort();
|
|
}
|
|
blk->legacy_dev = true;
|
|
}
|
|
|
|
/*
|
|
* Detach device model @dev from @blk.
|
|
* @dev must be currently attached to @blk.
|
|
*/
|
|
void blk_detach_dev(BlockBackend *blk, void *dev)
|
|
/* TODO change to DeviceState *dev when all users are qdevified */
|
|
{
|
|
assert(blk->dev == dev);
|
|
blk->dev = NULL;
|
|
blk->dev_ops = NULL;
|
|
blk->dev_opaque = NULL;
|
|
blk->guest_block_size = 512;
|
|
blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort);
|
|
blk_unref(blk);
|
|
}
|
|
|
|
/*
|
|
* Return the device model attached to @blk if any, else null.
|
|
*/
|
|
void *blk_get_attached_dev(BlockBackend *blk)
|
|
/* TODO change to return DeviceState * when all users are qdevified */
|
|
{
|
|
return blk->dev;
|
|
}
|
|
|
|
/* Return the qdev ID, or if no ID is assigned the QOM path, of the block
|
|
* device attached to the BlockBackend. */
|
|
static char *blk_get_attached_dev_id(BlockBackend *blk)
|
|
{
|
|
DeviceState *dev;
|
|
|
|
assert(!blk->legacy_dev);
|
|
dev = blk->dev;
|
|
|
|
if (!dev) {
|
|
return g_strdup("");
|
|
} else if (dev->id) {
|
|
return g_strdup(dev->id);
|
|
}
|
|
return object_get_canonical_path(OBJECT(dev));
|
|
}
|
|
|
|
/*
|
|
* Return the BlockBackend which has the device model @dev attached if it
|
|
* exists, else null.
|
|
*
|
|
* @dev must not be null.
|
|
*/
|
|
BlockBackend *blk_by_dev(void *dev)
|
|
{
|
|
BlockBackend *blk = NULL;
|
|
|
|
assert(dev != NULL);
|
|
while ((blk = blk_all_next(blk)) != NULL) {
|
|
if (blk->dev == dev) {
|
|
return blk;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
/* All drivers that use blk_set_dev_ops() are qdevified and we want to keep
|
|
* it that way, so we can assume blk->dev, if present, is a DeviceState if
|
|
* blk->dev_ops is set. Non-device users may use dev_ops without device. */
|
|
assert(!blk->legacy_dev);
|
|
|
|
blk->dev_ops = ops;
|
|
blk->dev_opaque = opaque;
|
|
|
|
/* Are we currently quiesced? Should we enforce this right now? */
|
|
if (blk->quiesce_counter && ops->drained_begin) {
|
|
ops->drained_begin(opaque);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Notify @blk's attached device model of media change.
|
|
*
|
|
* If @load is true, notify of media load. This action can fail, meaning that
|
|
* the medium cannot be loaded. @errp is set then.
|
|
*
|
|
* If @load is false, notify of media eject. This can never fail.
|
|
*
|
|
* Also send DEVICE_TRAY_MOVED events as appropriate.
|
|
*/
|
|
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp)
|
|
{
|
|
if (blk->dev_ops && blk->dev_ops->change_media_cb) {
|
|
bool tray_was_open, tray_is_open;
|
|
Error *local_err = NULL;
|
|
|
|
assert(!blk->legacy_dev);
|
|
|
|
tray_was_open = blk_dev_is_tray_open(blk);
|
|
blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err);
|
|
if (local_err) {
|
|
assert(load == true);
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
tray_is_open = blk_dev_is_tray_open(blk);
|
|
|
|
if (tray_was_open != tray_is_open) {
|
|
char *id = blk_get_attached_dev_id(blk);
|
|
qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open,
|
|
&error_abort);
|
|
g_free(id);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void blk_root_change_media(BdrvChild *child, bool load)
|
|
{
|
|
blk_dev_change_media_cb(child->opaque, load, NULL);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static void blk_root_resize(BdrvChild *child)
|
|
{
|
|
BlockBackend *blk = child->opaque;
|
|
|
|
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;
|
|
}
|
|
|
|
int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
|
|
unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret;
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
trace_blk_co_preadv(blk, bs, offset, bytes, flags);
|
|
|
|
ret = blk_check_byte_request(blk, offset, bytes);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
bdrv_inc_in_flight(bs);
|
|
|
|
/* throttling disk I/O */
|
|
if (blk->public.throttle_state) {
|
|
throttle_group_co_io_limits_intercept(blk, bytes, false);
|
|
}
|
|
|
|
ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags);
|
|
bdrv_dec_in_flight(bs);
|
|
return ret;
|
|
}
|
|
|
|
int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
|
|
unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret;
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
|
|
trace_blk_co_pwritev(blk, bs, offset, bytes, flags);
|
|
|
|
ret = blk_check_byte_request(blk, offset, bytes);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
bdrv_inc_in_flight(bs);
|
|
|
|
/* throttling disk I/O */
|
|
if (blk->public.throttle_state) {
|
|
throttle_group_co_io_limits_intercept(blk, bytes, true);
|
|
}
|
|
|
|
if (!blk->enable_write_cache) {
|
|
flags |= BDRV_REQ_FUA;
|
|
}
|
|
|
|
ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags);
|
|
bdrv_dec_in_flight(bs);
|
|
return ret;
|
|
}
|
|
|
|
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)
|
|
{
|
|
QEMUIOVector qiov;
|
|
struct iovec iov;
|
|
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,
|
|
};
|
|
|
|
if (qemu_in_coroutine()) {
|
|
/* Fast-path if already in coroutine context */
|
|
co_entry(&rwco);
|
|
} else {
|
|
Coroutine *co = qemu_coroutine_create(co_entry, &rwco);
|
|
bdrv_coroutine_enter(blk_bs(blk), co);
|
|
BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE);
|
|
}
|
|
|
|
return rwco.ret;
|
|
}
|
|
|
|
int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,
|
|
int count)
|
|
{
|
|
int ret;
|
|
|
|
ret = blk_check_byte_request(blk, offset, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
blk_root_drained_begin(blk->root);
|
|
ret = blk_pread(blk, offset, buf, count);
|
|
blk_root_drained_end(blk->root);
|
|
return ret;
|
|
}
|
|
|
|
int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
|
|
int count, BdrvRequestFlags flags)
|
|
{
|
|
return blk_prw(blk, offset, NULL, count, blk_write_entry,
|
|
flags | BDRV_REQ_ZERO_WRITE);
|
|
}
|
|
|
|
int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
|
|
{
|
|
return bdrv_make_zero(blk->root, flags);
|
|
}
|
|
|
|
static void error_callback_bh(void *opaque)
|
|
{
|
|
struct BlockBackendAIOCB *acb = opaque;
|
|
|
|
bdrv_dec_in_flight(acb->common.bs);
|
|
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;
|
|
|
|
bdrv_inc_in_flight(blk_bs(blk));
|
|
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
|
|
acb->blk = blk;
|
|
acb->ret = ret;
|
|
|
|
aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb);
|
|
return &acb->common;
|
|
}
|
|
|
|
typedef struct BlkAioEmAIOCB {
|
|
BlockAIOCB common;
|
|
BlkRwCo rwco;
|
|
int bytes;
|
|
bool has_returned;
|
|
} BlkAioEmAIOCB;
|
|
|
|
static const AIOCBInfo blk_aio_em_aiocb_info = {
|
|
.aiocb_size = sizeof(BlkAioEmAIOCB),
|
|
};
|
|
|
|
static void blk_aio_complete(BlkAioEmAIOCB *acb)
|
|
{
|
|
if (acb->has_returned) {
|
|
bdrv_dec_in_flight(acb->common.bs);
|
|
acb->common.cb(acb->common.opaque, acb->rwco.ret);
|
|
qemu_aio_unref(acb);
|
|
}
|
|
}
|
|
|
|
static void blk_aio_complete_bh(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
assert(acb->has_returned);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
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;
|
|
|
|
bdrv_inc_in_flight(blk_bs(blk));
|
|
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->has_returned = false;
|
|
|
|
co = qemu_coroutine_create(co_entry, acb);
|
|
bdrv_coroutine_enter(blk_bs(blk), co);
|
|
|
|
acb->has_returned = true;
|
|
if (acb->rwco.ret != NOT_DONE) {
|
|
aio_bh_schedule_oneshot(blk_get_aio_context(blk),
|
|
blk_aio_complete_bh, acb);
|
|
}
|
|
|
|
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_pwrite_zeroes(BlockBackend *blk, int64_t offset,
|
|
int count, BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry,
|
|
flags | 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,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry,
|
|
flags);
|
|
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_preadv(BlockBackend *blk, int64_t offset,
|
|
QEMUIOVector *qiov, BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return blk_aio_prwv(blk, offset, qiov->size, qiov,
|
|
blk_aio_read_entry, flags, cb, opaque);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset,
|
|
QEMUIOVector *qiov, BdrvRequestFlags flags,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return blk_aio_prwv(blk, offset, qiov->size, qiov,
|
|
blk_aio_write_entry, flags, cb, opaque);
|
|
}
|
|
|
|
static void blk_aio_flush_entry(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
BlkRwCo *rwco = &acb->rwco;
|
|
|
|
rwco->ret = blk_co_flush(rwco->blk);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_flush(BlockBackend *blk,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque);
|
|
}
|
|
|
|
static void blk_aio_pdiscard_entry(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
BlkRwCo *rwco = &acb->rwco;
|
|
|
|
rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk,
|
|
int64_t offset, int count,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
return blk_aio_prwv(blk, offset, count, NULL, blk_aio_pdiscard_entry, 0,
|
|
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_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_co_ioctl(blk_bs(blk), req, buf);
|
|
}
|
|
|
|
static void blk_ioctl_entry(void *opaque)
|
|
{
|
|
BlkRwCo *rwco = opaque;
|
|
rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset,
|
|
rwco->qiov->iov[0].iov_base);
|
|
}
|
|
|
|
int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
|
|
{
|
|
return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0);
|
|
}
|
|
|
|
static void blk_aio_ioctl_entry(void *opaque)
|
|
{
|
|
BlkAioEmAIOCB *acb = opaque;
|
|
BlkRwCo *rwco = &acb->rwco;
|
|
|
|
rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset,
|
|
rwco->qiov->iov[0].iov_base);
|
|
blk_aio_complete(acb);
|
|
}
|
|
|
|
BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
|
|
BlockCompletionFunc *cb, void *opaque)
|
|
{
|
|
QEMUIOVector qiov;
|
|
struct iovec iov;
|
|
|
|
iov = (struct iovec) {
|
|
.iov_base = buf,
|
|
.iov_len = 0,
|
|
};
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
|
|
return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque);
|
|
}
|
|
|
|
int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count)
|
|
{
|
|
int ret = blk_check_byte_request(blk, offset, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return bdrv_co_pdiscard(blk_bs(blk), offset, count);
|
|
}
|
|
|
|
int blk_co_flush(BlockBackend *blk)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_co_flush(blk_bs(blk));
|
|
}
|
|
|
|
static void blk_flush_entry(void *opaque)
|
|
{
|
|
BlkRwCo *rwco = opaque;
|
|
rwco->ret = blk_co_flush(rwco->blk);
|
|
}
|
|
|
|
int blk_flush(BlockBackend *blk)
|
|
{
|
|
return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0);
|
|
}
|
|
|
|
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;
|
|
case BLOCKDEV_ON_ERROR_AUTO:
|
|
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),
|
|
bdrv_get_node_name(blk_bs(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);
|
|
char *id;
|
|
|
|
/* blk_eject is only called by qdevified devices */
|
|
assert(!blk->legacy_dev);
|
|
|
|
if (bs) {
|
|
bdrv_eject(bs, eject_flag);
|
|
}
|
|
|
|
/* Whether or not we ejected on the backend,
|
|
* the frontend experienced a tray event. */
|
|
id = blk_get_attached_dev_id(blk);
|
|
qapi_event_send_device_tray_moved(blk_name(blk), id,
|
|
eject_flag, &error_abort);
|
|
g_free(id);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* Returns the maximum transfer length, in bytes; guaranteed nonzero */
|
|
uint32_t blk_get_max_transfer(BlockBackend *blk)
|
|
{
|
|
BlockDriverState *bs = blk_bs(blk);
|
|
uint32_t max = 0;
|
|
|
|
if (bs) {
|
|
max = bs->bl.max_transfer;
|
|
}
|
|
return MIN_NON_ZERO(max, INT_MAX);
|
|
}
|
|
|
|
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) {
|
|
if (blk->public.throttle_state) {
|
|
throttle_timers_detach_aio_context(&blk->public.throttle_timers);
|
|
}
|
|
bdrv_set_aio_context(bs, new_context);
|
|
if (blk->public.throttle_state) {
|
|
throttle_timers_attach_aio_context(&blk->public.throttle_timers,
|
|
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_pwrite_zeroes(BlockBackend *blk, int64_t offset,
|
|
int count, BdrvRequestFlags flags)
|
|
{
|
|
return blk_co_pwritev(blk, offset, count, NULL,
|
|
flags | BDRV_REQ_ZERO_WRITE);
|
|
}
|
|
|
|
int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
|
|
int count)
|
|
{
|
|
return blk_prw(blk, offset, (void *) buf, count, blk_write_entry,
|
|
BDRV_REQ_WRITE_COMPRESSED);
|
|
}
|
|
|
|
int blk_truncate(BlockBackend *blk, int64_t offset)
|
|
{
|
|
if (!blk_is_available(blk)) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return bdrv_truncate(blk->root, offset);
|
|
}
|
|
|
|
static void blk_pdiscard_entry(void *opaque)
|
|
{
|
|
BlkRwCo *rwco = opaque;
|
|
rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size);
|
|
}
|
|
|
|
int blk_pdiscard(BlockBackend *blk, int64_t offset, int count)
|
|
{
|
|
return blk_prw(blk, offset, NULL, count, blk_pdiscard_entry, 0);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Returns the detect-zeroes setting to be used for bdrv_open() of a
|
|
* BlockDriverState which is supposed to inherit the root state.
|
|
*/
|
|
bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk)
|
|
{
|
|
return blk->root_state.detect_zeroes;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
/* throttling disk I/O limits */
|
|
void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg)
|
|
{
|
|
throttle_group_config(blk, cfg);
|
|
}
|
|
|
|
void blk_io_limits_disable(BlockBackend *blk)
|
|
{
|
|
assert(blk->public.throttle_state);
|
|
bdrv_drained_begin(blk_bs(blk));
|
|
throttle_group_unregister_blk(blk);
|
|
bdrv_drained_end(blk_bs(blk));
|
|
}
|
|
|
|
/* should be called before blk_set_io_limits if a limit is set */
|
|
void blk_io_limits_enable(BlockBackend *blk, const char *group)
|
|
{
|
|
assert(!blk->public.throttle_state);
|
|
throttle_group_register_blk(blk, group);
|
|
}
|
|
|
|
void blk_io_limits_update_group(BlockBackend *blk, const char *group)
|
|
{
|
|
/* this BB is not part of any group */
|
|
if (!blk->public.throttle_state) {
|
|
return;
|
|
}
|
|
|
|
/* this BB is a part of the same group than the one we want */
|
|
if (!g_strcmp0(throttle_group_get_name(blk), group)) {
|
|
return;
|
|
}
|
|
|
|
/* need to change the group this bs belong to */
|
|
blk_io_limits_disable(blk);
|
|
blk_io_limits_enable(blk, group);
|
|
}
|
|
|
|
static void blk_root_drained_begin(BdrvChild *child)
|
|
{
|
|
BlockBackend *blk = child->opaque;
|
|
|
|
if (++blk->quiesce_counter == 1) {
|
|
if (blk->dev_ops && blk->dev_ops->drained_begin) {
|
|
blk->dev_ops->drained_begin(blk->dev_opaque);
|
|
}
|
|
}
|
|
|
|
/* Note that blk->root may not be accessible here yet if we are just
|
|
* attaching to a BlockDriverState that is drained. Use child instead. */
|
|
|
|
if (blk->public.io_limits_disabled++ == 0) {
|
|
throttle_group_restart_blk(blk);
|
|
}
|
|
}
|
|
|
|
static void blk_root_drained_end(BdrvChild *child)
|
|
{
|
|
BlockBackend *blk = child->opaque;
|
|
assert(blk->quiesce_counter);
|
|
|
|
assert(blk->public.io_limits_disabled);
|
|
--blk->public.io_limits_disabled;
|
|
|
|
if (--blk->quiesce_counter == 0) {
|
|
if (blk->dev_ops && blk->dev_ops->drained_end) {
|
|
blk->dev_ops->drained_end(blk->dev_opaque);
|
|
}
|
|
}
|
|
}
|