From bb756eebdac6fd24e8919e2c43f7d2c8c4091f59 Mon Sep 17 00:00:00 2001 From: RajithaY Date: Tue, 25 Apr 2017 03:31:15 -0700 Subject: Adding qemu as a submodule of KVMFORNFV This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY --- qemu/block/block-backend.c | 1635 -------------------------------------------- 1 file changed, 1635 deletions(-) delete mode 100644 qemu/block/block-backend.c (limited to 'qemu/block/block-backend.c') diff --git a/qemu/block/block-backend.c b/qemu/block/block-backend.c deleted file mode 100644 index 16c9d5e0f..000000000 --- a/qemu/block/block-backend.c +++ /dev/null @@ -1,1635 +0,0 @@ -/* - * QEMU Block backends - * - * Copyright (C) 2014 Red Hat, Inc. - * - * Authors: - * Markus Armbruster , - * - * This work is licensed under the terms of the GNU LGPL, version 2.1 - * or later. See the COPYING.LIB file in the top-level directory. - */ - -#include "qemu/osdep.h" -#include "sysemu/block-backend.h" -#include "block/block_int.h" -#include "block/blockjob.h" -#include "block/throttle-groups.h" -#include "sysemu/blockdev.h" -#include "sysemu/sysemu.h" -#include "qapi-event.h" -#include "qemu/id.h" - -/* Number of coroutines to reserve per attached device model */ -#define COROUTINE_POOL_RESERVATION 64 - -#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ - -static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); - -struct BlockBackend { - char *name; - int refcnt; - BdrvChild *root; - DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ - QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ - QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ - - void *dev; /* attached device model, if any */ - /* TODO change to DeviceState when all users are qdevified */ - const BlockDevOps *dev_ops; - void *dev_opaque; - - /* the block size for which the guest device expects atomicity */ - int guest_block_size; - - /* If the BDS tree is removed, some of its options are stored here (which - * can be used to restore those options in the new BDS on insert) */ - BlockBackendRootState root_state; - - bool enable_write_cache; - - /* I/O stats (display with "info blockstats"). */ - BlockAcctStats stats; - - BlockdevOnError on_read_error, on_write_error; - bool iostatus_enabled; - BlockDeviceIoStatus iostatus; - - bool allow_write_beyond_eof; - - NotifierList remove_bs_notifiers, insert_bs_notifiers; -}; - -typedef struct BlockBackendAIOCB { - BlockAIOCB common; - QEMUBH *bh; - BlockBackend *blk; - int ret; -} BlockBackendAIOCB; - -static const AIOCBInfo block_backend_aiocb_info = { - .get_aio_context = blk_aiocb_get_aio_context, - .aiocb_size = sizeof(BlockBackendAIOCB), -}; - -static void drive_info_del(DriveInfo *dinfo); - -/* All BlockBackends */ -static QTAILQ_HEAD(, BlockBackend) block_backends = - QTAILQ_HEAD_INITIALIZER(block_backends); - -/* All BlockBackends referenced by the monitor and which are iterated through by - * blk_next() */ -static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = - QTAILQ_HEAD_INITIALIZER(monitor_block_backends); - -static void blk_root_inherit_options(int *child_flags, QDict *child_options, - int parent_flags, QDict *parent_options) -{ - /* We're not supposed to call this function for root nodes */ - abort(); -} - -static const BdrvChildRole child_root = { - .inherit_options = blk_root_inherit_options, -}; - -/* - * Create a new BlockBackend with a reference count of one. - * Store an error through @errp on failure, unless it's null. - * Return the new BlockBackend on success, null on failure. - */ -BlockBackend *blk_new(Error **errp) -{ - BlockBackend *blk; - - blk = g_new0(BlockBackend, 1); - blk->refcnt = 1; - notifier_list_init(&blk->remove_bs_notifiers); - notifier_list_init(&blk->insert_bs_notifiers); - QTAILQ_INSERT_TAIL(&block_backends, blk, link); - return blk; -} - -/* - * Create a new BlockBackend with a new BlockDriverState attached. - * Otherwise just like blk_new(), which see. - */ -BlockBackend *blk_new_with_bs(Error **errp) -{ - BlockBackend *blk; - BlockDriverState *bs; - - blk = blk_new(errp); - if (!blk) { - return NULL; - } - - bs = bdrv_new_root(); - blk->root = bdrv_root_attach_child(bs, "root", &child_root); - bs->blk = blk; - return blk; -} - -/* - * Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState. - * - * Just as with bdrv_open(), after having called this function the reference to - * @options belongs to the block layer (even on failure). - * - * TODO: Remove @filename and @flags; it should be possible to specify a whole - * BDS tree just by specifying the @options QDict (or @reference, - * alternatively). At the time of adding this function, this is not possible, - * though, so callers of this function have to be able to specify @filename and - * @flags. - */ -BlockBackend *blk_new_open(const char *filename, const char *reference, - QDict *options, int flags, Error **errp) -{ - BlockBackend *blk; - int ret; - - blk = blk_new_with_bs(errp); - if (!blk) { - QDECREF(options); - return NULL; - } - - ret = bdrv_open(&blk->root->bs, filename, reference, options, flags, errp); - if (ret < 0) { - blk_unref(blk); - return NULL; - } - - blk_set_enable_write_cache(blk, true); - - return blk; -} - -static void blk_delete(BlockBackend *blk) -{ - assert(!blk->refcnt); - assert(!blk->name); - assert(!blk->dev); - if (blk->root) { - blk_remove_bs(blk); - } - assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); - assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); - if (blk->root_state.throttle_state) { - g_free(blk->root_state.throttle_group); - throttle_group_unref(blk->root_state.throttle_state); - } - QTAILQ_REMOVE(&block_backends, blk, link); - drive_info_del(blk->legacy_dinfo); - block_acct_cleanup(&blk->stats); - g_free(blk); -} - -static void drive_info_del(DriveInfo *dinfo) -{ - if (!dinfo) { - return; - } - qemu_opts_del(dinfo->opts); - g_free(dinfo->serial); - g_free(dinfo); -} - -int blk_get_refcnt(BlockBackend *blk) -{ - return blk ? blk->refcnt : 0; -} - -/* - * Increment @blk's reference count. - * @blk must not be null. - */ -void blk_ref(BlockBackend *blk) -{ - blk->refcnt++; -} - -/* - * Decrement @blk's reference count. - * If this drops it to zero, destroy @blk. - * For convenience, do nothing if @blk is null. - */ -void blk_unref(BlockBackend *blk) -{ - if (blk) { - assert(blk->refcnt > 0); - if (!--blk->refcnt) { - blk_delete(blk); - } - } -} - -/* - * Behaves similarly to blk_next() but iterates over all BlockBackends, even the - * ones which are hidden (i.e. are not referenced by the monitor). - */ -static BlockBackend *blk_all_next(BlockBackend *blk) -{ - return blk ? QTAILQ_NEXT(blk, link) - : QTAILQ_FIRST(&block_backends); -} - -void blk_remove_all_bs(void) -{ - BlockBackend *blk = NULL; - - while ((blk = blk_all_next(blk)) != NULL) { - AioContext *ctx = blk_get_aio_context(blk); - - aio_context_acquire(ctx); - if (blk->root) { - blk_remove_bs(blk); - } - aio_context_release(ctx); - } -} - -/* - * Return the monitor-owned BlockBackend after @blk. - * If @blk is null, return the first one. - * Else, return @blk's next sibling, which may be null. - * - * To iterate over all BlockBackends, do - * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { - * ... - * } - */ -BlockBackend *blk_next(BlockBackend *blk) -{ - return blk ? QTAILQ_NEXT(blk, monitor_link) - : QTAILQ_FIRST(&monitor_block_backends); -} - -/* - * Iterates over all BlockDriverStates which are attached to a BlockBackend. - * This function is for use by bdrv_next(). - * - * @bs must be NULL or a BDS that is attached to a BB. - */ -BlockDriverState *blk_next_root_bs(BlockDriverState *bs) -{ - BlockBackend *blk; - - if (bs) { - assert(bs->blk); - blk = bs->blk; - } else { - blk = NULL; - } - - do { - blk = blk_all_next(blk); - } while (blk && !blk->root); - - return blk ? blk->root->bs : NULL; -} - -/* - * Add a BlockBackend into the list of backends referenced by the monitor, with - * the given @name acting as the handle for the monitor. - * Strictly for use by blockdev.c. - * - * @name must not be null or empty. - * - * Returns true on success and false on failure. In the latter case, an Error - * object is returned through @errp. - */ -bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) -{ - assert(!blk->name); - assert(name && name[0]); - - if (!id_wellformed(name)) { - error_setg(errp, "Invalid device name"); - return false; - } - if (blk_by_name(name)) { - error_setg(errp, "Device with id '%s' already exists", name); - return false; - } - if (bdrv_find_node(name)) { - error_setg(errp, - "Device name '%s' conflicts with an existing node name", - name); - return false; - } - - blk->name = g_strdup(name); - QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); - return true; -} - -/* - * Remove a BlockBackend from the list of backends referenced by the monitor. - * Strictly for use by blockdev.c. - */ -void monitor_remove_blk(BlockBackend *blk) -{ - if (!blk->name) { - return; - } - - QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); - g_free(blk->name); - blk->name = NULL; -} - -/* - * Return @blk's name, a non-null string. - * Returns an empty string iff @blk is not referenced by the monitor. - */ -const char *blk_name(BlockBackend *blk) -{ - return blk->name ?: ""; -} - -/* - * Return the BlockBackend with name @name if it exists, else null. - * @name must not be null. - */ -BlockBackend *blk_by_name(const char *name) -{ - BlockBackend *blk = NULL; - - assert(name); - while ((blk = blk_next(blk)) != NULL) { - if (!strcmp(name, blk->name)) { - return blk; - } - } - return NULL; -} - -/* - * Return the BlockDriverState attached to @blk if any, else null. - */ -BlockDriverState *blk_bs(BlockBackend *blk) -{ - return blk->root ? blk->root->bs : NULL; -} - -/* - * Return @blk's DriveInfo if any, else null. - */ -DriveInfo *blk_legacy_dinfo(BlockBackend *blk) -{ - return blk->legacy_dinfo; -} - -/* - * Set @blk's DriveInfo to @dinfo, and return it. - * @blk must not have a DriveInfo set already. - * No other BlockBackend may have the same DriveInfo set. - */ -DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) -{ - assert(!blk->legacy_dinfo); - return blk->legacy_dinfo = dinfo; -} - -/* - * Return the BlockBackend with DriveInfo @dinfo. - * It must exist. - */ -BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) -{ - BlockBackend *blk = NULL; - - while ((blk = blk_next(blk)) != NULL) { - if (blk->legacy_dinfo == dinfo) { - return blk; - } - } - abort(); -} - -/* - * Disassociates the currently associated BlockDriverState from @blk. - */ -void blk_remove_bs(BlockBackend *blk) -{ - assert(blk->root->bs->blk == blk); - - notifier_list_notify(&blk->remove_bs_notifiers, blk); - - blk_update_root_state(blk); - - blk->root->bs->blk = NULL; - bdrv_root_unref_child(blk->root); - blk->root = NULL; -} - -/* - * Associates a new BlockDriverState with @blk. - */ -void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) -{ - assert(!blk->root && !bs->blk); - bdrv_ref(bs); - blk->root = bdrv_root_attach_child(bs, "root", &child_root); - bs->blk = blk; - - notifier_list_notify(&blk->insert_bs_notifiers, blk); -} - -/* - * Attach device model @dev to @blk. - * Return 0 on success, -EBUSY when a device model is attached already. - */ -int blk_attach_dev(BlockBackend *blk, void *dev) -/* TODO change to DeviceState *dev when all users are qdevified */ -{ - if (blk->dev) { - return -EBUSY; - } - blk_ref(blk); - blk->dev = dev; - blk_iostatus_reset(blk); - return 0; -} - -/* - * 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_nofail(BlockBackend *blk, void *dev) -{ - if (blk_attach_dev(blk, dev) < 0) { - abort(); - } -} - -/* - * 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_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; -} - -/* - * 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) -{ - blk->dev_ops = ops; - blk->dev_opaque = opaque; -} - -/* - * Notify @blk's attached device model of media change. - * If @load is true, notify of media load. - * Else, notify of media eject. - * Also send DEVICE_TRAY_MOVED events as appropriate. - */ -void blk_dev_change_media_cb(BlockBackend *blk, bool load) -{ - if (blk->dev_ops && blk->dev_ops->change_media_cb) { - bool tray_was_open, tray_is_open; - - tray_was_open = blk_dev_is_tray_open(blk); - blk->dev_ops->change_media_cb(blk->dev_opaque, load); - tray_is_open = blk_dev_is_tray_open(blk); - - if (tray_was_open != tray_is_open) { - qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, - &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, - flags | 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, 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) -{ - 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, - flags | 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; -} -- cgit 1.2.3-korg