From 7a9e51198c24a576275cf509a110d24d7c6ca664 Mon Sep 17 00:00:00 2001 From: Dong Jia Shi Date: Wed, 5 Apr 2017 11:19:09 +0200 Subject: [PATCH 1/3] block: pass the right options for BlockDriver.bdrv_open() raw_open() expects the caller always passing in the right actual @options parameter. But when trying to applying snapshot on a RBD image, bdrv_snapshot_goto() calls raw_open() (by calling the bdrv_open callback on the BlockDriver) with a NULL @options, and that will result in a Segmentation fault. For the other non-raw format drivers, it also makes sense to passing in the actual options, althought they don't trigger the problem so far. Let's prepare a @options by adding the "file" key-value pair to a copy of the actual options that were given for the node (i.e. bs->options), and pass it to the callback. BlockDriver.bdrv_open() expects bs->file to be NULL and just overwrites it with the result from bdrv_open_child(). That means we should actually make sure it's NULL because otherwise the child BDS will have a reference count that is 1 too high. So we unconditionally invoke bdrv_unref_child() before calling BlockDriver.bdrv_open(), and we wrap everything in bdrv_ref()/bdrv_unref() so the BDS isn't deleted in the meantime. Suggested-by: Max Reitz Signed-off-by: Dong Jia Shi Message-id: 20170405091909.36357-2-bjsdjshi@linux.vnet.ibm.com Signed-off-by: Max Reitz --- block/snapshot.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/block/snapshot.c b/block/snapshot.c index bf5c2ca5e1..06b1185d27 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -27,6 +27,7 @@ #include "block/block_int.h" #include "qapi/error.h" #include "qapi/qmp/qerror.h" +#include "qapi/qmp/qstring.h" QemuOptsList internal_snapshot_opts = { .name = "snapshot", @@ -189,14 +190,33 @@ int bdrv_snapshot_goto(BlockDriverState *bs, } if (bs->file) { + BlockDriverState *file; + QDict *options = qdict_clone_shallow(bs->options); + QDict *file_options; + + file = bs->file->bs; + /* Prevent it from getting deleted when detached from bs */ + bdrv_ref(file); + + qdict_extract_subqdict(options, &file_options, "file."); + QDECREF(file_options); + qdict_put(options, "file", qstring_from_str(bdrv_get_node_name(file))); + drv->bdrv_close(bs); - ret = bdrv_snapshot_goto(bs->file->bs, snapshot_id); - open_ret = drv->bdrv_open(bs, NULL, bs->open_flags, NULL); + bdrv_unref_child(bs, bs->file); + bs->file = NULL; + + ret = bdrv_snapshot_goto(file, snapshot_id); + open_ret = drv->bdrv_open(bs, options, bs->open_flags, NULL); + QDECREF(options); if (open_ret < 0) { - bdrv_unref(bs->file->bs); + bdrv_unref(file); bs->drv = NULL; return open_ret; } + + assert(bs->file->bs == file); + bdrv_unref(file); return ret; } From 1606e4cf8a976513ecac70ad6642a7ec45744cf5 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Thu, 6 Apr 2017 14:08:47 -0500 Subject: [PATCH 2/3] throttle: Remove block from group on hot-unplug When a block device that is part of a throttle group is hot-unplugged, we forgot to remove it from the throttle group. This leaves stale memory around, and causes an easily reproducible crash: $ ./x86_64-softmmu/qemu-system-x86_64 -nodefaults -nographic -qmp stdio \ -device virtio-scsi-pci,bus=pci.0 -drive \ id=drive_image2,if=none,format=raw,file=file2,bps=512000,iops=100,group=foo \ -device scsi-hd,id=image2,drive=drive_image2 -drive \ id=drive_image3,if=none,format=raw,file=file3,bps=512000,iops=100,group=foo \ -device scsi-hd,id=image3,drive=drive_image3 {'execute':'qmp_capabilities'} {'execute':'device_del','arguments':{'id':'image3'}} {'execute':'system_reset'} Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1428810 Suggested-by: Alberto Garcia Signed-off-by: Eric Blake Message-id: 20170406190847.29347-1-eblake@redhat.com Reviewed-by: Stefan Hajnoczi Signed-off-by: Max Reitz --- block/block-backend.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/block-backend.c b/block/block-backend.c index a8f2b3440f..7405024e08 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -231,6 +231,9 @@ static void blk_delete(BlockBackend *blk) assert(!blk->refcnt); assert(!blk->name); assert(!blk->dev); + if (blk->public.throttle_state) { + blk_io_limits_disable(blk); + } if (blk->root) { blk_remove_bs(blk); } From 2ec9a782d159e2bc6655fc0b783deda197bbe0b7 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Mon, 10 Apr 2017 15:54:51 +0800 Subject: [PATCH 3/3] iscsi: Fix iscsi_create Since d5895fcb (iscsi: Split URL into individual options), creating qcow2 image on an iscsi LUN fails: qemu-img create -f qcow2 iscsi://$SERVER/$IQN/0 1G qemu-img: iscsi://$SERVER/$IQN/0: Could not create image: Invalid argument The problem is iscsi_open now expects that transport_name, portal and target are already parsed into structured options by iscsi_parse_filename, but it is not called in iscsi_create. Signed-off-by: Fam Zheng Message-id: 20170410075451.21329-1-famz@redhat.com Reviewed-by: Eric Blake [mreitz: Dropped now superfluous qdict_put(bs_options, "filename", ...)] Signed-off-by: Max Reitz --- block/iscsi.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/block/iscsi.c b/block/iscsi.c index 716e74abba..42fb0b019c 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -2092,6 +2092,7 @@ static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) BlockDriverState *bs; IscsiLun *iscsilun = NULL; QDict *bs_options; + Error *local_err = NULL; bs = bdrv_new(); @@ -2102,8 +2103,13 @@ static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) iscsilun = bs->opaque; bs_options = qdict_new(); - qdict_put(bs_options, "filename", qstring_from_str(filename)); - ret = iscsi_open(bs, bs_options, 0, NULL); + iscsi_parse_filename(filename, bs_options, &local_err); + if (local_err) { + error_propagate(errp, local_err); + ret = -EINVAL; + } else { + ret = iscsi_open(bs, bs_options, 0, NULL); + } QDECREF(bs_options); if (ret != 0) {