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Vladimir Sementsov-Ogievskiy 64631f3681 block: drop BLK_PERM_GRAPH_MOD 
First, this permission never protected a node from being changed, as
generic child-replacing functions don't check it.

Second, it's a strange thing: it presents a permission of parent node
to change its child. But generally, children are replaced by different
mechanisms, like jobs or qmp commands, not by nodes.

Graph-mod permission is hard to understand. All other permissions
describe operations which done by parent node on its child: read,
write, resize. Graph modification operations are something completely
different.

The only place where BLK_PERM_GRAPH_MOD is used as "perm" (not shared
perm) is mirror_start_job, for s->target. Still modern code should use
bdrv_freeze_backing_chain() to protect from graph modification, if we
don't do it somewhere it may be considered as a bug. So, it's a bit
risky to drop GRAPH_MOD, and analyzing of possible loss of protection
is hard. But one day we should do it, let's do it now.

One more bit of information is that locking the corresponding byte in
file-posix doesn't make sense at all.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210902093754.2352-1-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-01-14 12:03:16 +01:00
..
ci block/file-posix: Simplify the XFS_IOC_DIOINFO handling 2022-01-12 14:09:04 +01:00
coccinelle softmmu/memory: Pass ram_flags to memory_region_init_ram_shared_nomigrate() 2021-06-15 20:27:38 +02:00
codeconverter scripts/codeconverter: Update to latest version 2020-09-18 14:12:32 -04:00
coverity-scan block/file-posix: Simplify the XFS_IOC_DIOINFO handling 2022-01-12 14:09:04 +01:00
kvm scripts/kvm/vmxcap: Use Python 3 interpreter and add pseudo-main() 2020-05-31 13:56:46 +02:00
modules scripts/modules/module_block: Use Python 3 interpreter & add pseudo-main 2020-05-31 13:56:46 +02:00
oss-fuzz fuzz: add an instrumentation filter 2021-09-01 07:33:13 -04:00
performance scripts/performance: Add dissect.py script 2020-07-14 22:22:22 +02:00
qapi qapi: Extend -compat to set policy for unstable interfaces 2021-10-29 21:28:01 +02:00
qemu-guest-agent
qemugdb scripts/gdb: implement 'qemu bt' 2021-01-12 12:38:03 +01:00
qmp scripts/qmp-shell: add redirection shim 2021-06-18 16:10:07 -04:00
simplebench simplebench: Fix Python syntax error (reported by LGTM) 2022-01-10 18:23:10 -05:00
tracetool scripts/tracetool: Replace the word 'whitelist' 2021-03-09 22:14:26 +01:00
analyse-9p-simpletrace.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
analyse-locks-simpletrace.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
analyze-inclusions
analyze-migration.py analyze-migration.py: fix extract contents ('-x') errors 2021-10-23 20:28:56 +02:00
archive-source.sh build-sys: add meson submodule 2020-08-21 06:30:06 -04:00
block-coroutine-wrapper.py block-coroutine-wrapper.py: support BlockBackend first argument 2021-10-15 15:51:33 -05:00
check_sparse.py meson: move sparse detection to Meson and rewrite check_sparse.py 2020-10-04 18:36:23 +02:00
checkpatch.pl checkpatch: Do not allow deprecated g_memdup() 2021-12-17 11:57:35 +01:00
clean-header-guards.pl scripts/: fix some comment spelling errors 2020-09-17 20:37:55 +02:00
clean-includes meson: rename included C source files to .c.inc 2020-08-21 06:18:30 -04:00
cleanup-trace-events.pl scripts/cleanup-trace-events: Emit files in alphabetical order 2020-09-09 17:17:00 +01:00
cocci-macro-file.h compiler.h: remove QEMU_GNUC_PREREQ 2020-12-15 12:53:15 -05:00
cpu-x86-uarch-abi.py scripts: helper to generate x86_64 CPU ABI compat info 2021-06-17 14:11:06 -04:00
decodetree.py decodetree: Extend argument set syntax to allow types 2021-05-01 11:45:35 -07:00
device-crash-test scripts/device-crash-test: Use a QMP timeout 2021-11-22 18:41:21 -05:00
disas-objdump.pl
dump-guest-memory.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
entitlement.sh scripts/entitlement.sh: Use backward-compatible cp flags 2021-11-30 22:25:58 +01:00
extract-vsssdk-headers
feature_to_c.sh meson: cpu-emu 2020-08-21 06:30:39 -04:00
fix-multiline-comments.sh docs: move CODING_STYLE into the developer documentation 2021-02-24 11:05:21 +00:00
gensyscalls.sh Hexagon (linux-user/hexagon) Linux user emulation 2021-02-18 07:48:22 -08:00
get_maintainer.pl get_maintainer: update repo URL to GitLab 2021-02-09 20:53:56 +00:00
git-submodule.sh configure: replace --enable/disable-git-update with --with-git-submodules 2021-01-29 17:07:53 +00:00
git.orderfile scripts/git.orderfile: Keep files with .inc extension sorted 2020-12-15 12:53:16 -05:00
hxtool meson: generate hxtool files 2020-08-21 06:30:14 -04:00
hxtool-conv.pl scripts/hxtool-conv: Archive script used in qemu-options.hx conversion 2020-03-06 10:05:24 +00:00
kernel-doc scripts/kernel-doc: strip QEMU_ from function definitions 2021-03-24 14:24:40 +00:00
make-config-poison.sh configure, meson: move config-poison.h to meson 2022-01-12 14:09:06 +01:00
make-release roms/edk2: Only initialize required submodules 2021-10-20 16:26:19 -07:00
meson-buildoptions.py configure: parse --enable/--disable-strip automatically, flip default 2022-01-12 14:09:06 +01:00
meson-buildoptions.sh configure: parse --enable/--disable-strip automatically, flip default 2022-01-12 14:09:06 +01:00
meson.build trace: move configuration from configure to Meson 2021-10-14 09:50:56 +02:00
minikconf.py meson: infrastructure for building emulators 2020-08-21 06:30:17 -04:00
modinfo-collect.py scripts: teach modinfo to skip non-C sources 2021-12-21 10:50:21 +04:00
modinfo-generate.py modules: check if all dependencies can be satisfied 2021-07-09 18:20:27 +02:00
mtest2make.py build: use "meson test" as the test harness 2021-12-23 10:06:19 +01:00
nsis.py meson: Fix argument for makensis (build regression) 2020-11-18 09:28:55 +01:00
qapi-gen.py qapi: move generator entrypoint into package 2020-10-10 11:37:47 +02:00
qemu-binfmt-conf.sh qemu-binfmt-conf.sh: fix -F option 2022-01-06 11:40:40 +01:00
qemu-gdb.py scripts/gdb: implement 'qemu bt' 2021-01-12 12:38:03 +01:00
qemu-trace-stap qemu-trace-stap: changing SYSTEMTAP_TAPSET considered harmful. 2021-07-12 17:37:06 +01:00
qemu-version.sh build-sys: fix git version from -version 2020-10-12 11:50:23 -04:00
refresh-pxe-roms.sh
render_block_graph.py block: drop BLK_PERM_GRAPH_MOD 2022-01-14 12:03:16 +01:00
replay-dump.py nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
shaderinclude.pl
signrom.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
simpletrace.py docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
switch-timer-api
test-driver.py mtest2make: hide output of successful tests 2020-09-08 07:17:09 +02:00
tracetool.py tracetool: add output filename command-line argument 2021-01-04 14:24:58 +00:00
u2f-setup-gen.py scripts: Add u2f-setup-gen script 2020-08-31 08:23:39 +02:00
undefsym.py build: fix macOS --enable-modules build 2020-10-22 11:53:52 -04:00
update-linux-headers.sh headers: Add udmabuf.h 2021-05-27 12:06:37 +02:00
update-mips-syscall-args.sh linux-user, mips: update syscall-args-o32.c.inc to Linux v5.13 2021-07-13 13:59:59 +02:00
update-syscalltbl.sh linux-user, scripts: add a script to update syscall.tbl 2020-03-20 16:02:00 +01:00
userfaultfd-wrlat.py migration: introduce 'userfaultfd-wrlat.py' script 2021-02-08 11:19:51 +00:00
vmstate-static-checker.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00