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author | Anas Nashif <anas.nashif@intel.com> | 2012-11-06 07:50:24 -0800 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-11-06 07:50:24 -0800 |
commit | 060629c6ef0b7e5c267d84c91600113264d33120 (patch) | |
tree | 18fcb144ac71b9c4d08ee5d1dc58e2b16c109a5a /blockdev.c | |
download | qemu-060629c6ef0b7e5c267d84c91600113264d33120.tar.gz qemu-060629c6ef0b7e5c267d84c91600113264d33120.tar.bz2 qemu-060629c6ef0b7e5c267d84c91600113264d33120.zip |
Imported Upstream version 1.2.0upstream/1.2.0
Diffstat (limited to 'blockdev.c')
-rw-r--r-- | blockdev.c | 1194 |
1 files changed, 1194 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c new file mode 100644 index 000000000..7c83baa35 --- /dev/null +++ b/blockdev.c @@ -0,0 +1,1194 @@ +/* + * QEMU host block devices + * + * Copyright (c) 2003-2008 Fabrice Bellard + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * later. See the COPYING file in the top-level directory. + */ + +#include "blockdev.h" +#include "hw/block-common.h" +#include "monitor.h" +#include "qerror.h" +#include "qemu-option.h" +#include "qemu-config.h" +#include "qemu-objects.h" +#include "sysemu.h" +#include "block_int.h" +#include "qmp-commands.h" +#include "trace.h" +#include "arch_init.h" + +static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); + +static const char *const if_name[IF_COUNT] = { + [IF_NONE] = "none", + [IF_IDE] = "ide", + [IF_SCSI] = "scsi", + [IF_FLOPPY] = "floppy", + [IF_PFLASH] = "pflash", + [IF_MTD] = "mtd", + [IF_SD] = "sd", + [IF_VIRTIO] = "virtio", + [IF_XEN] = "xen", +}; + +static const int if_max_devs[IF_COUNT] = { + /* + * Do not change these numbers! They govern how drive option + * index maps to unit and bus. That mapping is ABI. + * + * All controllers used to imlement if=T drives need to support + * if_max_devs[T] units, for any T with if_max_devs[T] != 0. + * Otherwise, some index values map to "impossible" bus, unit + * values. + * + * For instance, if you change [IF_SCSI] to 255, -drive + * if=scsi,index=12 no longer means bus=1,unit=5, but + * bus=0,unit=12. With an lsi53c895a controller (7 units max), + * the drive can't be set up. Regression. + */ + [IF_IDE] = 2, + [IF_SCSI] = 7, +}; + +/* + * We automatically delete the drive when a device using it gets + * unplugged. Questionable feature, but we can't just drop it. + * Device models call blockdev_mark_auto_del() to schedule the + * automatic deletion, and generic qdev code calls blockdev_auto_del() + * when deletion is actually safe. + */ +void blockdev_mark_auto_del(BlockDriverState *bs) +{ + DriveInfo *dinfo = drive_get_by_blockdev(bs); + + if (bs->job) { + block_job_cancel(bs->job); + } + if (dinfo) { + dinfo->auto_del = 1; + } +} + +void blockdev_auto_del(BlockDriverState *bs) +{ + DriveInfo *dinfo = drive_get_by_blockdev(bs); + + if (dinfo && dinfo->auto_del) { + drive_put_ref(dinfo); + } +} + +static int drive_index_to_bus_id(BlockInterfaceType type, int index) +{ + int max_devs = if_max_devs[type]; + return max_devs ? index / max_devs : 0; +} + +static int drive_index_to_unit_id(BlockInterfaceType type, int index) +{ + int max_devs = if_max_devs[type]; + return max_devs ? index % max_devs : index; +} + +QemuOpts *drive_def(const char *optstr) +{ + return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); +} + +QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, + const char *optstr) +{ + QemuOpts *opts; + char buf[32]; + + opts = drive_def(optstr); + if (!opts) { + return NULL; + } + if (type != IF_DEFAULT) { + qemu_opt_set(opts, "if", if_name[type]); + } + if (index >= 0) { + snprintf(buf, sizeof(buf), "%d", index); + qemu_opt_set(opts, "index", buf); + } + if (file) + qemu_opt_set(opts, "file", file); + return opts; +} + +DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) +{ + DriveInfo *dinfo; + + /* seek interface, bus and unit */ + + QTAILQ_FOREACH(dinfo, &drives, next) { + if (dinfo->type == type && + dinfo->bus == bus && + dinfo->unit == unit) + return dinfo; + } + + return NULL; +} + +DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) +{ + return drive_get(type, + drive_index_to_bus_id(type, index), + drive_index_to_unit_id(type, index)); +} + +int drive_get_max_bus(BlockInterfaceType type) +{ + int max_bus; + DriveInfo *dinfo; + + max_bus = -1; + QTAILQ_FOREACH(dinfo, &drives, next) { + if(dinfo->type == type && + dinfo->bus > max_bus) + max_bus = dinfo->bus; + } + return max_bus; +} + +/* Get a block device. This should only be used for single-drive devices + (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the + appropriate bus. */ +DriveInfo *drive_get_next(BlockInterfaceType type) +{ + static int next_block_unit[IF_COUNT]; + + return drive_get(type, 0, next_block_unit[type]++); +} + +DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) +{ + DriveInfo *dinfo; + + QTAILQ_FOREACH(dinfo, &drives, next) { + if (dinfo->bdrv == bs) { + return dinfo; + } + } + return NULL; +} + +static void bdrv_format_print(void *opaque, const char *name) +{ + error_printf(" %s", name); +} + +static void drive_uninit(DriveInfo *dinfo) +{ + qemu_opts_del(dinfo->opts); + bdrv_delete(dinfo->bdrv); + g_free(dinfo->id); + QTAILQ_REMOVE(&drives, dinfo, next); + g_free(dinfo); +} + +void drive_put_ref(DriveInfo *dinfo) +{ + assert(dinfo->refcount); + if (--dinfo->refcount == 0) { + drive_uninit(dinfo); + } +} + +void drive_get_ref(DriveInfo *dinfo) +{ + dinfo->refcount++; +} + +typedef struct { + QEMUBH *bh; + DriveInfo *dinfo; +} DrivePutRefBH; + +static void drive_put_ref_bh(void *opaque) +{ + DrivePutRefBH *s = opaque; + + drive_put_ref(s->dinfo); + qemu_bh_delete(s->bh); + g_free(s); +} + +/* + * Release a drive reference in a BH + * + * It is not possible to use drive_put_ref() from a callback function when the + * callers still need the drive. In such cases we schedule a BH to release the + * reference. + */ +static void drive_put_ref_bh_schedule(DriveInfo *dinfo) +{ + DrivePutRefBH *s; + + s = g_new(DrivePutRefBH, 1); + s->bh = qemu_bh_new(drive_put_ref_bh, s); + s->dinfo = dinfo; + qemu_bh_schedule(s->bh); +} + +static int parse_block_error_action(const char *buf, int is_read) +{ + if (!strcmp(buf, "ignore")) { + return BLOCK_ERR_IGNORE; + } else if (!is_read && !strcmp(buf, "enospc")) { + return BLOCK_ERR_STOP_ENOSPC; + } else if (!strcmp(buf, "stop")) { + return BLOCK_ERR_STOP_ANY; + } else if (!strcmp(buf, "report")) { + return BLOCK_ERR_REPORT; + } else { + error_report("'%s' invalid %s error action", + buf, is_read ? "read" : "write"); + return -1; + } +} + +static bool do_check_io_limits(BlockIOLimit *io_limits) +{ + bool bps_flag; + bool iops_flag; + + assert(io_limits); + + bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) + && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) + || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); + iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) + && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) + || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); + if (bps_flag || iops_flag) { + return false; + } + + return true; +} + +DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) +{ + const char *buf; + const char *file = NULL; + const char *serial; + const char *mediastr = ""; + BlockInterfaceType type; + enum { MEDIA_DISK, MEDIA_CDROM } media; + int bus_id, unit_id; + int cyls, heads, secs, translation; + BlockDriver *drv = NULL; + int max_devs; + int index; + int ro = 0; + int bdrv_flags = 0; + int on_read_error, on_write_error; + const char *devaddr; + DriveInfo *dinfo; + BlockIOLimit io_limits; + int snapshot = 0; + bool copy_on_read; + int ret; + + translation = BIOS_ATA_TRANSLATION_AUTO; + media = MEDIA_DISK; + + /* extract parameters */ + bus_id = qemu_opt_get_number(opts, "bus", 0); + unit_id = qemu_opt_get_number(opts, "unit", -1); + index = qemu_opt_get_number(opts, "index", -1); + + cyls = qemu_opt_get_number(opts, "cyls", 0); + heads = qemu_opt_get_number(opts, "heads", 0); + secs = qemu_opt_get_number(opts, "secs", 0); + + snapshot = qemu_opt_get_bool(opts, "snapshot", 0); + ro = qemu_opt_get_bool(opts, "readonly", 0); + copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); + + file = qemu_opt_get(opts, "file"); + serial = qemu_opt_get(opts, "serial"); + + if ((buf = qemu_opt_get(opts, "if")) != NULL) { + for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) + ; + if (type == IF_COUNT) { + error_report("unsupported bus type '%s'", buf); + return NULL; + } + } else { + type = default_to_scsi ? IF_SCSI : IF_IDE; + } + + max_devs = if_max_devs[type]; + + if (cyls || heads || secs) { + if (cyls < 1) { + error_report("invalid physical cyls number"); + return NULL; + } + if (heads < 1) { + error_report("invalid physical heads number"); + return NULL; + } + if (secs < 1) { + error_report("invalid physical secs number"); + return NULL; + } + } + + if ((buf = qemu_opt_get(opts, "trans")) != NULL) { + if (!cyls) { + error_report("'%s' trans must be used with cyls, heads and secs", + buf); + return NULL; + } + if (!strcmp(buf, "none")) + translation = BIOS_ATA_TRANSLATION_NONE; + else if (!strcmp(buf, "lba")) + translation = BIOS_ATA_TRANSLATION_LBA; + else if (!strcmp(buf, "auto")) + translation = BIOS_ATA_TRANSLATION_AUTO; + else { + error_report("'%s' invalid translation type", buf); + return NULL; + } + } + + if ((buf = qemu_opt_get(opts, "media")) != NULL) { + if (!strcmp(buf, "disk")) { + media = MEDIA_DISK; + } else if (!strcmp(buf, "cdrom")) { + if (cyls || secs || heads) { + error_report("CHS can't be set with media=%s", buf); + return NULL; + } + media = MEDIA_CDROM; + } else { + error_report("'%s' invalid media", buf); + return NULL; + } + } + + bdrv_flags |= BDRV_O_CACHE_WB; + if ((buf = qemu_opt_get(opts, "cache")) != NULL) { + if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { + error_report("invalid cache option"); + return NULL; + } + } + +#ifdef CONFIG_LINUX_AIO + if ((buf = qemu_opt_get(opts, "aio")) != NULL) { + if (!strcmp(buf, "native")) { + bdrv_flags |= BDRV_O_NATIVE_AIO; + } else if (!strcmp(buf, "threads")) { + /* this is the default */ + } else { + error_report("invalid aio option"); + return NULL; + } + } +#endif + + if ((buf = qemu_opt_get(opts, "format")) != NULL) { + if (is_help_option(buf)) { + error_printf("Supported formats:"); + bdrv_iterate_format(bdrv_format_print, NULL); + error_printf("\n"); + return NULL; + } + drv = bdrv_find_whitelisted_format(buf); + if (!drv) { + error_report("'%s' invalid format", buf); + return NULL; + } + } + + /* disk I/O throttling */ + io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = + qemu_opt_get_number(opts, "bps", 0); + io_limits.bps[BLOCK_IO_LIMIT_READ] = + qemu_opt_get_number(opts, "bps_rd", 0); + io_limits.bps[BLOCK_IO_LIMIT_WRITE] = + qemu_opt_get_number(opts, "bps_wr", 0); + io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = + qemu_opt_get_number(opts, "iops", 0); + io_limits.iops[BLOCK_IO_LIMIT_READ] = + qemu_opt_get_number(opts, "iops_rd", 0); + io_limits.iops[BLOCK_IO_LIMIT_WRITE] = + qemu_opt_get_number(opts, "iops_wr", 0); + + if (!do_check_io_limits(&io_limits)) { + error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " + "cannot be used at the same time"); + return NULL; + } + + on_write_error = BLOCK_ERR_STOP_ENOSPC; + if ((buf = qemu_opt_get(opts, "werror")) != NULL) { + if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { + error_report("werror is not supported by this bus type"); + return NULL; + } + + on_write_error = parse_block_error_action(buf, 0); + if (on_write_error < 0) { + return NULL; + } + } + + on_read_error = BLOCK_ERR_REPORT; + if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { + if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { + error_report("rerror is not supported by this bus type"); + return NULL; + } + + on_read_error = parse_block_error_action(buf, 1); + if (on_read_error < 0) { + return NULL; + } + } + + if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { + if (type != IF_VIRTIO) { + error_report("addr is not supported by this bus type"); + return NULL; + } + } + + /* compute bus and unit according index */ + + if (index != -1) { + if (bus_id != 0 || unit_id != -1) { + error_report("index cannot be used with bus and unit"); + return NULL; + } + bus_id = drive_index_to_bus_id(type, index); + unit_id = drive_index_to_unit_id(type, index); + } + + /* if user doesn't specify a unit_id, + * try to find the first free + */ + + if (unit_id == -1) { + unit_id = 0; + while (drive_get(type, bus_id, unit_id) != NULL) { + unit_id++; + if (max_devs && unit_id >= max_devs) { + unit_id -= max_devs; + bus_id++; + } + } + } + + /* check unit id */ + + if (max_devs && unit_id >= max_devs) { + error_report("unit %d too big (max is %d)", + unit_id, max_devs - 1); + return NULL; + } + + /* + * catch multiple definitions + */ + + if (drive_get(type, bus_id, unit_id) != NULL) { + error_report("drive with bus=%d, unit=%d (index=%d) exists", + bus_id, unit_id, index); + return NULL; + } + + /* init */ + + dinfo = g_malloc0(sizeof(*dinfo)); + if ((buf = qemu_opts_id(opts)) != NULL) { + dinfo->id = g_strdup(buf); + } else { + /* no id supplied -> create one */ + dinfo->id = g_malloc0(32); + if (type == IF_IDE || type == IF_SCSI) + mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; + if (max_devs) + snprintf(dinfo->id, 32, "%s%i%s%i", + if_name[type], bus_id, mediastr, unit_id); + else + snprintf(dinfo->id, 32, "%s%s%i", + if_name[type], mediastr, unit_id); + } + dinfo->bdrv = bdrv_new(dinfo->id); + dinfo->devaddr = devaddr; + dinfo->type = type; + dinfo->bus = bus_id; + dinfo->unit = unit_id; + dinfo->cyls = cyls; + dinfo->heads = heads; + dinfo->secs = secs; + dinfo->trans = translation; + dinfo->opts = opts; + dinfo->refcount = 1; + dinfo->serial = serial; + QTAILQ_INSERT_TAIL(&drives, dinfo, next); + + bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); + + /* disk I/O throttling */ + bdrv_set_io_limits(dinfo->bdrv, &io_limits); + + switch(type) { + case IF_IDE: + case IF_SCSI: + case IF_XEN: + case IF_NONE: + dinfo->media_cd = media == MEDIA_CDROM; + break; + case IF_SD: + case IF_FLOPPY: + case IF_PFLASH: + case IF_MTD: + break; + case IF_VIRTIO: + /* add virtio block device */ + opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL); + if (arch_type == QEMU_ARCH_S390X) { + qemu_opt_set(opts, "driver", "virtio-blk-s390"); + } else { + qemu_opt_set(opts, "driver", "virtio-blk-pci"); + } + qemu_opt_set(opts, "drive", dinfo->id); + if (devaddr) + qemu_opt_set(opts, "addr", devaddr); + break; + default: + abort(); + } + if (!file || !*file) { + return dinfo; + } + if (snapshot) { + /* always use cache=unsafe with snapshot */ + bdrv_flags &= ~BDRV_O_CACHE_MASK; + bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); + } + + if (copy_on_read) { + bdrv_flags |= BDRV_O_COPY_ON_READ; + } + + if (runstate_check(RUN_STATE_INMIGRATE)) { + bdrv_flags |= BDRV_O_INCOMING; + } + + if (media == MEDIA_CDROM) { + /* CDROM is fine for any interface, don't check. */ + ro = 1; + } else if (ro == 1) { + if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && + type != IF_NONE && type != IF_PFLASH) { + error_report("readonly not supported by this bus type"); + goto err; + } + } + + bdrv_flags |= ro ? 0 : BDRV_O_RDWR; + + if (ro && copy_on_read) { + error_report("warning: disabling copy_on_read on readonly drive"); + } + + ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); + if (ret < 0) { + error_report("could not open disk image %s: %s", + file, strerror(-ret)); + goto err; + } + + if (bdrv_key_required(dinfo->bdrv)) + autostart = 0; + return dinfo; + +err: + bdrv_delete(dinfo->bdrv); + g_free(dinfo->id); + QTAILQ_REMOVE(&drives, dinfo, next); + g_free(dinfo); + return NULL; +} + +void do_commit(Monitor *mon, const QDict *qdict) +{ + const char *device = qdict_get_str(qdict, "device"); + BlockDriverState *bs; + int ret; + + if (!strcmp(device, "all")) { + ret = bdrv_commit_all(); + if (ret == -EBUSY) { + qerror_report(QERR_DEVICE_IN_USE, device); + return; + } + } else { + bs = bdrv_find(device); + if (!bs) { + qerror_report(QERR_DEVICE_NOT_FOUND, device); + return; + } + ret = bdrv_commit(bs); + if (ret == -EBUSY) { + qerror_report(QERR_DEVICE_IN_USE, device); + return; + } + } +} + +static void blockdev_do_action(int kind, void *data, Error **errp) +{ + BlockdevAction action; + BlockdevActionList list; + + action.kind = kind; + action.data = data; + list.value = &action; + list.next = NULL; + qmp_transaction(&list, errp); +} + +void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, + bool has_format, const char *format, + bool has_mode, enum NewImageMode mode, + Error **errp) +{ + BlockdevSnapshot snapshot = { + .device = (char *) device, + .snapshot_file = (char *) snapshot_file, + .has_format = has_format, + .format = (char *) format, + .has_mode = has_mode, + .mode = mode, + }; + blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, + errp); +} + + +/* New and old BlockDriverState structs for group snapshots */ +typedef struct BlkTransactionStates { + BlockDriverState *old_bs; + BlockDriverState *new_bs; + QSIMPLEQ_ENTRY(BlkTransactionStates) entry; +} BlkTransactionStates; + +/* + * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail + * then we do not pivot any of the devices in the group, and abandon the + * snapshots + */ +void qmp_transaction(BlockdevActionList *dev_list, Error **errp) +{ + int ret = 0; + BlockdevActionList *dev_entry = dev_list; + BlkTransactionStates *states, *next; + + QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; + QSIMPLEQ_INIT(&snap_bdrv_states); + + /* drain all i/o before any snapshots */ + bdrv_drain_all(); + + /* We don't do anything in this loop that commits us to the snapshot */ + while (NULL != dev_entry) { + BlockdevAction *dev_info = NULL; + BlockDriver *proto_drv; + BlockDriver *drv; + int flags; + enum NewImageMode mode; + const char *new_image_file; + const char *device; + const char *format = "qcow2"; + + dev_info = dev_entry->value; + dev_entry = dev_entry->next; + + states = g_malloc0(sizeof(BlkTransactionStates)); + QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); + + switch (dev_info->kind) { + case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: + device = dev_info->blockdev_snapshot_sync->device; + if (!dev_info->blockdev_snapshot_sync->has_mode) { + dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; + } + new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file; + if (dev_info->blockdev_snapshot_sync->has_format) { + format = dev_info->blockdev_snapshot_sync->format; + } + mode = dev_info->blockdev_snapshot_sync->mode; + break; + default: + abort(); + } + + drv = bdrv_find_format(format); + if (!drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + goto delete_and_fail; + } + + states->old_bs = bdrv_find(device); + if (!states->old_bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + goto delete_and_fail; + } + + if (!bdrv_is_inserted(states->old_bs)) { + error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + goto delete_and_fail; + } + + if (bdrv_in_use(states->old_bs)) { + error_set(errp, QERR_DEVICE_IN_USE, device); + goto delete_and_fail; + } + + if (!bdrv_is_read_only(states->old_bs)) { + if (bdrv_flush(states->old_bs)) { + error_set(errp, QERR_IO_ERROR); + goto delete_and_fail; + } + } + + flags = states->old_bs->open_flags; + + proto_drv = bdrv_find_protocol(new_image_file); + if (!proto_drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + goto delete_and_fail; + } + + /* create new image w/backing file */ + if (mode != NEW_IMAGE_MODE_EXISTING) { + ret = bdrv_img_create(new_image_file, format, + states->old_bs->filename, + states->old_bs->drv->format_name, + NULL, -1, flags); + if (ret) { + error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); + goto delete_and_fail; + } + } + + /* We will manually add the backing_hd field to the bs later */ + states->new_bs = bdrv_new(""); + ret = bdrv_open(states->new_bs, new_image_file, + flags | BDRV_O_NO_BACKING, drv); + if (ret != 0) { + error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); + goto delete_and_fail; + } + } + + + /* Now we are going to do the actual pivot. Everything up to this point + * is reversible, but we are committed at this point */ + QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { + /* This removes our old bs from the bdrv_states, and adds the new bs */ + bdrv_append(states->new_bs, states->old_bs); + } + + /* success */ + goto exit; + +delete_and_fail: + /* + * failure, and it is all-or-none; abandon each new bs, and keep using + * the original bs for all images + */ + QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { + if (states->new_bs) { + bdrv_delete(states->new_bs); + } + } +exit: + QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { + g_free(states); + } + return; +} + + +static void eject_device(BlockDriverState *bs, int force, Error **errp) +{ + if (bdrv_in_use(bs)) { + error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); + return; + } + if (!bdrv_dev_has_removable_media(bs)) { + error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); + return; + } + + if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { + bdrv_dev_eject_request(bs, force); + if (!force) { + error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); + return; + } + } + + bdrv_close(bs); +} + +void qmp_eject(const char *device, bool has_force, bool force, Error **errp) +{ + BlockDriverState *bs; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + eject_device(bs, force, errp); +} + +void qmp_block_passwd(const char *device, const char *password, Error **errp) +{ + BlockDriverState *bs; + int err; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + err = bdrv_set_key(bs, password); + if (err == -EINVAL) { + error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); + return; + } else if (err < 0) { + error_set(errp, QERR_INVALID_PASSWORD); + return; + } +} + +static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, + int bdrv_flags, BlockDriver *drv, + const char *password, Error **errp) +{ + if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { + error_set(errp, QERR_OPEN_FILE_FAILED, filename); + return; + } + + if (bdrv_key_required(bs)) { + if (password) { + if (bdrv_set_key(bs, password) < 0) { + error_set(errp, QERR_INVALID_PASSWORD); + } + } else { + error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), + bdrv_get_encrypted_filename(bs)); + } + } else if (password) { + error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); + } +} + +void qmp_change_blockdev(const char *device, const char *filename, + bool has_format, const char *format, Error **errp) +{ + BlockDriverState *bs; + BlockDriver *drv = NULL; + int bdrv_flags; + Error *err = NULL; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + if (format) { + drv = bdrv_find_whitelisted_format(format); + if (!drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + return; + } + } + + eject_device(bs, 0, &err); + if (error_is_set(&err)) { + error_propagate(errp, err); + return; + } + + bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; + bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; + + qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); +} + +/* throttling disk I/O limits */ +void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, + int64_t bps_wr, int64_t iops, int64_t iops_rd, + int64_t iops_wr, Error **errp) +{ + BlockIOLimit io_limits; + BlockDriverState *bs; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; + io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; + io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; + io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; + io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; + io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; + + if (!do_check_io_limits(&io_limits)) { + error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); + return; + } + + bs->io_limits = io_limits; + bs->slice_time = BLOCK_IO_SLICE_TIME; + + if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { + bdrv_io_limits_enable(bs); + } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { + bdrv_io_limits_disable(bs); + } else { + if (bs->block_timer) { + qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); + } + } +} + +int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) +{ + const char *id = qdict_get_str(qdict, "id"); + BlockDriverState *bs; + + bs = bdrv_find(id); + if (!bs) { + qerror_report(QERR_DEVICE_NOT_FOUND, id); + return -1; + } + if (bdrv_in_use(bs)) { + qerror_report(QERR_DEVICE_IN_USE, id); + return -1; + } + + /* quiesce block driver; prevent further io */ + bdrv_drain_all(); + bdrv_flush(bs); + bdrv_close(bs); + + /* if we have a device attached to this BlockDriverState + * then we need to make the drive anonymous until the device + * can be removed. If this is a drive with no device backing + * then we can just get rid of the block driver state right here. + */ + if (bdrv_get_attached_dev(bs)) { + bdrv_make_anon(bs); + } else { + drive_uninit(drive_get_by_blockdev(bs)); + } + + return 0; +} + +void qmp_block_resize(const char *device, int64_t size, Error **errp) +{ + BlockDriverState *bs; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + if (size < 0) { + error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); + return; + } + + switch (bdrv_truncate(bs, size)) { + case 0: + break; + case -ENOMEDIUM: + error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + break; + case -ENOTSUP: + error_set(errp, QERR_UNSUPPORTED); + break; + case -EACCES: + error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); + break; + case -EBUSY: + error_set(errp, QERR_DEVICE_IN_USE, device); + break; + default: + error_set(errp, QERR_UNDEFINED_ERROR); + break; + } +} + +static QObject *qobject_from_block_job(BlockJob *job) +{ + return qobject_from_jsonf("{ 'type': %s," + "'device': %s," + "'len': %" PRId64 "," + "'offset': %" PRId64 "," + "'speed': %" PRId64 " }", + job->job_type->job_type, + bdrv_get_device_name(job->bs), + job->len, + job->offset, + job->speed); +} + +static void block_stream_cb(void *opaque, int ret) +{ + BlockDriverState *bs = opaque; + QObject *obj; + + trace_block_stream_cb(bs, bs->job, ret); + + assert(bs->job); + obj = qobject_from_block_job(bs->job); + if (ret < 0) { + QDict *dict = qobject_to_qdict(obj); + qdict_put(dict, "error", qstring_from_str(strerror(-ret))); + } + + if (block_job_is_cancelled(bs->job)) { + monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); + } else { + monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); + } + qobject_decref(obj); + + drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); +} + +void qmp_block_stream(const char *device, bool has_base, + const char *base, bool has_speed, + int64_t speed, Error **errp) +{ + BlockDriverState *bs; + BlockDriverState *base_bs = NULL; + Error *local_err = NULL; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + if (base) { + base_bs = bdrv_find_backing_image(bs, base); + if (base_bs == NULL) { + error_set(errp, QERR_BASE_NOT_FOUND, base); + return; + } + } + + stream_start(bs, base_bs, base, has_speed ? speed : 0, + block_stream_cb, bs, &local_err); + if (error_is_set(&local_err)) { + error_propagate(errp, local_err); + return; + } + + /* Grab a reference so hotplug does not delete the BlockDriverState from + * underneath us. + */ + drive_get_ref(drive_get_by_blockdev(bs)); + + trace_qmp_block_stream(bs, bs->job); +} + +static BlockJob *find_block_job(const char *device) +{ + BlockDriverState *bs; + + bs = bdrv_find(device); + if (!bs || !bs->job) { + return NULL; + } + return bs->job; +} + +void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) +{ + BlockJob *job = find_block_job(device); + + if (!job) { + error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); + return; + } + + block_job_set_speed(job, speed, errp); +} + +void qmp_block_job_cancel(const char *device, Error **errp) +{ + BlockJob *job = find_block_job(device); + + if (!job) { + error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); + return; + } + + trace_qmp_block_job_cancel(job); + block_job_cancel(job); +} + +static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) +{ + BlockJobInfoList **prev = opaque; + BlockJob *job = bs->job; + + if (job) { + BlockJobInfoList *elem; + BlockJobInfo *info = g_new(BlockJobInfo, 1); + *info = (BlockJobInfo){ + .type = g_strdup(job->job_type->job_type), + .device = g_strdup(bdrv_get_device_name(bs)), + .len = job->len, + .offset = job->offset, + .speed = job->speed, + }; + + elem = g_new0(BlockJobInfoList, 1); + elem->value = info; + + (*prev)->next = elem; + *prev = elem; + } +} + +BlockJobInfoList *qmp_query_block_jobs(Error **errp) +{ + /* Dummy is a fake list element for holding the head pointer */ + BlockJobInfoList dummy = {}; + BlockJobInfoList *prev = &dummy; + bdrv_iterate(do_qmp_query_block_jobs_one, &prev); + return dummy.next; +} |