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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Browse Source 
Block layer patches

- qemu-storage-daemon: Add vhost-user-blk help
- block-backend: Fix use-after-free for BDS pointers after aio_poll()
- qemu-img: Fix sparseness of output image with unaligned ranges
- vvfat: Fix crashes in read-write mode
- Fix device deletion events with -device JSON syntax
- Code cleanups

# gpg: Signature made Fri 14 Jan 2022 13:50:16 GMT
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  iotests/testrunner.py: refactor test_field_width
  block: drop BLK_PERM_GRAPH_MOD
  qemu-img: make is_allocated_sectors() more efficient
  iotests: Test qemu-img convert of zeroed data cluster
  vvfat: Fix vvfat_write() for writes before the root directory
  vvfat: Fix size of temporary qcow file
  iotests/308: Fix for CAP_DAC_OVERRIDE
  iotests/stream-error-on-reset: New test
  block-backend: prevent dangling BDS pointers across aio_poll()
  qapi/block: Restrict vhost-user-blk to CONFIG_VHOST_USER_BLK_SERVER
  qemu-storage-daemon: Add vhost-user-blk help
  docs: Correct 'vhost-user-blk' spelling
  softmmu: fix device deletion events with -device JSON syntax
  include/sysemu/blockdev.h: remove drive_get_max_devs
  include/sysemu/blockdev.h: remove drive_mark_claimed_by_board and inline drive_def
  block_int: make bdrv_backing_overridden static

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell
2022-01-14 15:56:30 +00:00
parent 0b3f07ebf2 e5e7487395
commit 1cd2ad11d3
28 changed files with 307 additions and 104 deletions
Download Patch File Download Diff File Expand all files Collapse all files
block.c
+4 -7
View File
@@ -103,6 +103,8 @@ static int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
static void bdrv_reopen_commit(BDRVReopenState *reopen_state);
static void bdrv_reopen_abort(BDRVReopenState *reopen_state);
static bool bdrv_backing_overridden(BlockDriverState *bs);
/* If non-zero, use only whitelisted block drivers */
static int use_bdrv_whitelist;
@@ -2483,7 +2485,6 @@ char *bdrv_perm_names(uint64_t perm)
{ BLK_PERM_WRITE, "write" },
{ BLK_PERM_WRITE_UNCHANGED, "write unchanged" },
{ BLK_PERM_RESIZE, "resize" },
{ BLK_PERM_GRAPH_MOD, "change children" },
{ 0, NULL }
};
@@ -2599,8 +2600,7 @@ static void bdrv_default_perms_for_cow(BlockDriverState *bs, BdrvChild *c,
shared = 0;
}
shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD |
BLK_PERM_WRITE_UNCHANGED;
shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED;
if (bs->open_flags & BDRV_O_INACTIVE) {
shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
@@ -2718,7 +2718,6 @@ uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm)
[BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE,
[BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED,
[BLOCK_PERMISSION_RESIZE] = BLK_PERM_RESIZE,
[BLOCK_PERMISSION_GRAPH_MOD] = BLK_PERM_GRAPH_MOD,
};
QEMU_BUILD_BUG_ON(ARRAY_SIZE(permissions) != BLOCK_PERMISSION__MAX);
@@ -5544,8 +5543,6 @@ int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top);
/* success - we can delete the intermediate states, and link top->base */
/* TODO Check graph modification op blockers (BLK_PERM_GRAPH_MOD) once
* we've figured out how they should work. */
if (!backing_file_str) {
bdrv_refresh_filename(base);
backing_file_str = base->filename;
@@ -7475,7 +7472,7 @@ static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs)
/* Note: This function may return false positives; it may return true
* even if opening the backing file specified by bs's image header
* would result in exactly bs->backing. */
bool bdrv_backing_overridden(BlockDriverState *bs)
static bool bdrv_backing_overridden(BlockDriverState *bs)
{
if (bs->backing) {
return strcmp(bs->auto_backing_file,
block/block-backend.c
+17 -2
View File
@@ -822,16 +822,22 @@ BlockBackend *blk_by_public(BlockBackendPublic *public)
void blk_remove_bs(BlockBackend *blk)
{
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
BlockDriverState *bs;
BdrvChild *root;
notifier_list_notify(&blk->remove_bs_notifiers, blk);
if (tgm->throttle_state) {
bs = blk_bs(blk);
BlockDriverState *bs = blk_bs(blk);
/*
* Take a ref in case blk_bs() changes across bdrv_drained_begin(), for
* example, if a temporary filter node is removed by a blockjob.
*/
bdrv_ref(bs);
bdrv_drained_begin(bs);
throttle_group_detach_aio_context(tgm);
throttle_group_attach_aio_context(tgm, qemu_get_aio_context());
bdrv_drained_end(bs);
bdrv_unref(bs);
}
blk_update_root_state(blk);
@@ -1705,6 +1711,7 @@ void blk_drain(BlockBackend *blk)
BlockDriverState *bs = blk_bs(blk);
if (bs) {
bdrv_ref(bs);
bdrv_drained_begin(bs);
}
@@ -1714,6 +1721,7 @@ void blk_drain(BlockBackend *blk)
if (bs) {
bdrv_drained_end(bs);
bdrv_unref(bs);
}
}
@@ -2044,10 +2052,13 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
int ret;
if (bs) {
bdrv_ref(bs);
if (update_root_node) {
ret = bdrv_child_try_set_aio_context(bs, new_context, blk->root,
errp);
if (ret < 0) {
bdrv_unref(bs);
return ret;
}
}
@@ -2057,6 +2068,8 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
throttle_group_attach_aio_context(tgm, new_context);
bdrv_drained_end(bs);
}
bdrv_unref(bs);
}
blk->ctx = new_context;
@@ -2326,11 +2339,13 @@ void blk_io_limits_disable(BlockBackend *blk)
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
assert(tgm->throttle_state);
if (bs) {
bdrv_ref(bs);
bdrv_drained_begin(bs);
}
throttle_group_unregister_tgm(tgm);
if (bs) {
bdrv_drained_end(bs);
bdrv_unref(bs);
}
}
block/commit.c
-1
View File
@@ -370,7 +370,6 @@ void commit_start(const char *job_id, BlockDriverState *bs,
s->base = blk_new(s->common.job.aio_context,
base_perms,
BLK_PERM_CONSISTENT_READ
| BLK_PERM_GRAPH_MOD
| BLK_PERM_WRITE_UNCHANGED);
ret = blk_insert_bs(s->base, base, errp);
if (ret < 0) {
block/mirror.c
+3 -12
View File
@@ -1139,10 +1139,7 @@ static void mirror_complete(Job *job, Error **errp)
replace_aio_context = bdrv_get_aio_context(s->to_replace);
aio_context_acquire(replace_aio_context);
/* TODO Translate this into permission system. Current definition of
* GRAPH_MOD would require to request it for the parents; they might
* not even be BlockDriverStates, however, so a BdrvChild can't address
* them. May need redefinition of GRAPH_MOD. */
/* TODO Translate this into child freeze system. */
error_setg(&s->replace_blocker,
"block device is in use by block-job-complete");
bdrv_op_block_all(s->to_replace, s->replace_blocker);
@@ -1666,7 +1663,7 @@ static BlockJob *mirror_start_job(
s = block_job_create(job_id, driver, NULL, mirror_top_bs,
BLK_PERM_CONSISTENT_READ,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_WRITE | BLK_PERM_GRAPH_MOD, speed,
BLK_PERM_WRITE, speed,
creation_flags, cb, opaque, errp);
if (!s) {
goto fail;
@@ -1710,9 +1707,7 @@ static BlockJob *mirror_start_job(
target_perms |= BLK_PERM_RESIZE;
}
target_shared_perms |= BLK_PERM_CONSISTENT_READ
| BLK_PERM_WRITE
| BLK_PERM_GRAPH_MOD;
target_shared_perms |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE;
} else if (bdrv_chain_contains(bs, bdrv_skip_filters(target))) {
/*
* We may want to allow this in the future, but it would
@@ -1723,10 +1718,6 @@ static BlockJob *mirror_start_job(
goto fail;
}
if (backing_mode != MIRROR_LEAVE_BACKING_CHAIN) {
target_perms |= BLK_PERM_GRAPH_MOD;
}
s->target = blk_new(s->common.job.aio_context,
target_perms, target_shared_perms);
ret = blk_insert_bs(s->target, target, errp);
block/monitor/block-hmp-cmds.c
+1 -1
View File
@@ -101,7 +101,7 @@ void hmp_drive_add(Monitor *mon, const QDict *qdict)
return;
}
opts = drive_def(optstr);
opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
if (!opts)
return;
block/vvfat.c
+25 -12
View File
@@ -882,7 +882,7 @@ static int read_directory(BDRVVVFATState* s, int mapping_index)
return 0;
}
static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
static inline int32_t sector2cluster(BDRVVVFATState* s,off_t sector_num)
{
return (sector_num - s->offset_to_root_dir) / s->sectors_per_cluster;
}
@@ -1230,6 +1230,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
dirname, cyls, heads, secs));
s->sector_count = cyls * heads * secs - s->offset_to_bootsector;
bs->total_sectors = cyls * heads * secs;
if (qemu_opt_get_bool(opts, "rw", false)) {
if (!bdrv_is_read_only(bs)) {
@@ -1250,8 +1251,6 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
}
}
bs->total_sectors = cyls * heads * secs;
if (init_directories(s, dirname, heads, secs, errp)) {
ret = -EIO;
goto fail;
@@ -2982,6 +2981,7 @@ static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
{
BDRVVVFATState *s = bs->opaque;
int i, ret;
int first_cluster, last_cluster;
DLOG(checkpoint());
@@ -3000,9 +3000,20 @@ DLOG(checkpoint());
if (sector_num < s->offset_to_fat)
return -1;
for (i = sector2cluster(s, sector_num);
i <= sector2cluster(s, sector_num + nb_sectors - 1);) {
mapping_t* mapping = find_mapping_for_cluster(s, i);
/*
* Values will be negative for writes to the FAT, which is located before
* the root directory.
*/
first_cluster = sector2cluster(s, sector_num);
last_cluster = sector2cluster(s, sector_num + nb_sectors - 1);
for (i = first_cluster; i <= last_cluster;) {
mapping_t *mapping = NULL;
if (i >= 0) {
mapping = find_mapping_for_cluster(s, i);
}
if (mapping) {
if (mapping->read_only) {
fprintf(stderr, "Tried to write to write-protected file %s\n",
@@ -3042,8 +3053,9 @@ DLOG(checkpoint());
}
}
i = mapping->end;
} else
} else {
i++;
}
}
/*
@@ -3057,10 +3069,11 @@ DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sec
return ret;
}
for (i = sector2cluster(s, sector_num);
i <= sector2cluster(s, sector_num + nb_sectors - 1); i++)
if (i >= 0)
for (i = first_cluster; i <= last_cluster; i++) {
if (i >= 0) {
s->used_clusters[i] |= USED_ALLOCATED;
}
}
DLOG(checkpoint());
/* TODO: add timeout */
@@ -3147,8 +3160,8 @@ static int enable_write_target(BlockDriverState *bs, Error **errp)
}
opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512,
&error_abort);
qemu_opt_set_number(opts, BLOCK_OPT_SIZE,
bs->total_sectors * BDRV_SECTOR_SIZE, &error_abort);
qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:", &error_abort);
ret = bdrv_create(bdrv_qcow, s->qcow_filename, opts, errp);
blockdev.c
+1 -23
View File
@@ -168,23 +168,6 @@ void blockdev_auto_del(BlockBackend *blk)
}
}
/**
* Returns the current mapping of how many units per bus
* a particular interface can support.
*
* A positive integer indicates n units per bus.
* 0 implies the mapping has not been established.
* -1 indicates an invalid BlockInterfaceType was given.
*/
int drive_get_max_devs(BlockInterfaceType type)
{
if (type >= IF_IDE && type < IF_COUNT) {
return if_max_devs[type];
}
return -1;
}
static int drive_index_to_bus_id(BlockInterfaceType type, int index)
{
int max_devs = if_max_devs[type];
@@ -197,17 +180,12 @@ static int drive_index_to_unit_id(BlockInterfaceType type, int index)
return max_devs ? index % max_devs : index;
}
QemuOpts *drive_def(const char *optstr)
{
return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
}
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
QemuOpts *opts;
opts = drive_def(optstr);
opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
if (!opts) {
return NULL;
}
docs/tools/qemu-storage-daemon.rst
+1 -1
View File
@@ -201,7 +201,7 @@ Export raw image file ``disk.img`` over NBD UNIX domain socket ``nbd.sock``::
--nbd-server addr.type=unix,addr.path=nbd.sock \
--export type=nbd,id=export,node-name=disk,writable=on
Export a qcow2 image file ``disk.qcow2`` as a vhosts-user-blk device over UNIX
Export a qcow2 image file ``disk.qcow2`` as a vhost-user-blk device over UNIX
domain socket ``vhost-user-blk.sock``::
$ qemu-storage-daemon \
hw/block/block.c
+1 -2
View File
@@ -171,8 +171,7 @@ bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
perm |= BLK_PERM_WRITE;
}
shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_GRAPH_MOD;
shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED;
if (resizable) {
shared_perm |= BLK_PERM_RESIZE;
}
include/block/block.h
+5 -4
View File
@@ -269,12 +269,13 @@ enum {
BLK_PERM_RESIZE = 0x08,
/**
* This permission is required to change the node that this BdrvChild
* points to.
* There was a now-removed bit BLK_PERM_GRAPH_MOD, with value of 0x10. QEMU
* 6.1 and earlier may still lock the corresponding byte in block/file-posix
* locking. So, implementing some new permission should be very careful to
* not interfere with this old unused thing.
*/
BLK_PERM_GRAPH_MOD = 0x10,
BLK_PERM_ALL = 0x1f,
BLK_PERM_ALL = 0x0f,
DEFAULT_PERM_PASSTHROUGH = BLK_PERM_CONSISTENT_READ
| BLK_PERM_WRITE
include/block/block_int.h
-3
View File
@@ -1122,9 +1122,6 @@ BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
QDict *options);
bool bdrv_backing_overridden(BlockDriverState *bs);
/**
* bdrv_add_aio_context_notifier:
*
include/sysemu/blockdev.h
-3
View File
@@ -45,13 +45,10 @@ BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo);
void override_max_devs(BlockInterfaceType type, int max_devs);
DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
void drive_mark_claimed_by_board(void);
void drive_check_orphaned(void);
DriveInfo *drive_get_by_index(BlockInterfaceType type, int index);
int drive_get_max_bus(BlockInterfaceType type);
int drive_get_max_devs(BlockInterfaceType type);
QemuOpts *drive_def(const char *optstr);
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr);
DriveInfo *drive_new(QemuOpts *arg, BlockInterfaceType block_default_type,
qapi/block-core.json
+2 -5
View File
@@ -1878,14 +1878,11 @@
#
# @resize: This permission is required to change the size of a block node.
#
# @graph-mod: This permission is required to change the node that this
# BdrvChild points to.
#
# Since: 4.0
##
{ 'enum': 'BlockPermission',
'data': [ 'consistent-read', 'write', 'write-unchanged', 'resize',
'graph-mod' ] }
'data': [ 'consistent-read', 'write', 'write-unchanged', 'resize' ] }
##
# @XDbgBlockGraphEdge:
#
qapi/block-export.json
+4 -2
View File
@@ -277,7 +277,8 @@
# Since: 4.2
##
{ 'enum': 'BlockExportType',
'data': [ 'nbd', 'vhost-user-blk',
'data': [ 'nbd',
{ 'name': 'vhost-user-blk', 'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
{ 'name': 'fuse', 'if': 'CONFIG_FUSE' } ] }
##
@@ -319,7 +320,8 @@
'discriminator': 'type',
'data': {
'nbd': 'BlockExportOptionsNbd',
'vhost-user-blk': 'BlockExportOptionsVhostUserBlk',
'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk',
'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
'fuse': { 'type': 'BlockExportOptionsFuse',
'if': 'CONFIG_FUSE' }
} }
qapi/qdev.json
+4 -1
View File
@@ -44,6 +44,9 @@
# @json-cli: If present, the "-device" command line option supports JSON
# syntax with a structure identical to the arguments of this
# command.
# @json-cli-hotplug: If present, the "-device" command line option supports JSON
# syntax without the reference counting leak that broke
# hot-unplug
#
# Notes:
#
@@ -74,7 +77,7 @@
{ 'command': 'device_add',
'data': {'driver': 'str', '*bus': 'str', '*id': 'str'},
'gen': false, # so we can get the additional arguments
'features': ['json-cli'] }
'features': ['json-cli', 'json-cli-hotplug'] }
##
# @device_del:
qemu-img.c
+19 -4
View File
@@ -1171,19 +1171,34 @@ static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum,
}
}
if (i == n) {
/*
* The whole buf is the same.
* No reason to split it into chunks, so return now.
*/
*pnum = i;
return !is_zero;
}
tail = (sector_num + i) & (alignment - 1);
if (tail) {
if (is_zero && i <= tail) {
/* treat unallocated areas which only consist
* of a small tail as allocated. */
/*
* For sure next sector after i is data, and it will rewrite this
* tail anyway due to RMW. So, let's just write data now.
*/
is_zero = false;
}
if (!is_zero) {
/* align up end offset of allocated areas. */
/* If possible, align up end offset of allocated areas. */
i += alignment - tail;
i = MIN(i, n);
} else {
/* align down end offset of zero areas. */
/*
* For sure next sector after i is data, and it will rewrite this
* tail anyway due to RMW. Better is avoid RMW and write zeroes up
* to aligned bound.
*/
i -= tail;
}
}
scripts/render_block_graph.py
-1
View File
@@ -35,7 +35,6 @@ def perm(arr):
s = 'w' if 'write' in arr else '_'
s += 'r' if 'consistent-read' in arr else '_'
s += 'u' if 'write-unchanged' in arr else '_'
s += 'g' if 'graph-mod' in arr else '_'
s += 's' if 'resize' in arr else '_'
return s
softmmu/vl.c
+6 -2
View File
@@ -2684,6 +2684,7 @@ static void qemu_create_cli_devices(void)
qemu_opts_foreach(qemu_find_opts("device"),
device_init_func, NULL, &error_fatal);
QTAILQ_FOREACH(opt, &device_opts, next) {
DeviceState *dev;
loc_push_restore(&opt->loc);
/*
* TODO Eventually we should call qmp_device_add() here to make sure it
@@ -2692,7 +2693,8 @@ static void qemu_create_cli_devices(void)
* from the start, so call qdev_device_add_from_qdict() directly for
* now.
*/
qdev_device_add_from_qdict(opt->opts, true, &error_fatal);
dev = qdev_device_add_from_qdict(opt->opts, true, &error_fatal);
object_unref(OBJECT(dev));
loc_pop(&opt->loc);
}
rom_reset_order_override();
@@ -2887,7 +2889,9 @@ void qemu_init(int argc, char **argv, char **envp)
break;
}
case QEMU_OPTION_drive:
if (drive_def(optarg) == NULL) {
opts = qemu_opts_parse_noisily(qemu_find_opts("drive"),
optarg, false);
if (opts == NULL) {
exit(1);
}
break;
storage-daemon/qemu-storage-daemon.c
+13
View File
@@ -104,6 +104,19 @@ static void help(void)
" export the specified block node over FUSE\n"
"\n"
#endif /* CONFIG_FUSE */
#ifdef CONFIG_VHOST_USER_BLK_SERVER
" --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n"
" addr.type=unix,addr.path=<socket-path>[,writable=on|off]\n"
" [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n"
" export the specified block node as a\n"
" vhost-user-blk device over UNIX domain socket\n"
" --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n"
" fd,addr.str=<fd>[,writable=on|off]\n"
" [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n"
" export the specified block node as a\n"
" vhost-user-blk device over file descriptor\n"
"\n"
#endif /* CONFIG_VHOST_USER_BLK_SERVER */
" --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n"
" configure a QMP monitor\n"
"\n"
tests/qemu-iotests/122
+1
View File
@@ -251,6 +251,7 @@ $QEMU_IO -c "write -P 0 0 64k" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_test
$QEMU_IO -c "write 0 1k" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "write 8k 1k" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "write 17k 1k" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "write -P 0 65k 1k" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
for min_sparse in 4k 8k; do
echo

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