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2023-04-25vvfat: mark various functions as coroutine_fnPaolo Bonzini
Functions that can do I/O are prime candidates for being coroutine_fns. Make the change for those that are themselves called only from coroutine_fns. In addition, coroutine_fns should do I/O using bdrv_co_*() functions, for which it is required to hold the BlockDriverState graph lock. So also nnotate functions on the I/O path with TSA attributes, making it possible to switch them to use bdrv_co_*() functions. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20230309084456.304669-2-pbonzini@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-02-27block/vvfat: Remove pointless check of NDEBUGPhilippe Mathieu-Daudé
Since commit 262a69f428 ("osdep.h: Prohibit disabling assert() in supported builds") 'NDEBUG' can not be defined, so '#ifndef NDEBUG' is dead code. Remove it. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230221232520.14480-5-philmd@linaro.org>
2023-01-20include/block: Untangle inclusion loopsMarkus Armbruster
We have two inclusion loops: block/block.h -> block/block-global-state.h -> block/block-common.h -> block/blockjob.h -> block/block.h block/block.h -> block/block-io.h -> block/block-common.h -> block/blockjob.h -> block/block.h I believe these go back to Emanuele's reorganization of the block API, merged a few months ago in commit d7e2fe4aac8. Fortunately, breaking them is merely a matter of deleting unnecessary includes from headers, and adding them back in places where they are now missing. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20221221133551.3967339-2-armbru@redhat.com>
2022-10-31block/vvfat: Unify the mkdir() callBin Meng
There is a difference in the mkdir() call for win32 and non-win32 platforms, and currently is handled in the codes with #ifdefs. glib provides a portable g_mkdir() API and we can use it to unify the codes without #ifdefs. Signed-off-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20221006151927.2079583-6-bmeng.cn@gmail.com> Message-Id: <20221027183637.2772968-14-alex.bennee@linaro.org>
2022-10-27vvfat: allow spaces in file namesHervé Poussineau
In R/W mode, files with spaces were never created on host side. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1176 Fixes: c79e243ed67683d6d06692bd7040f7394da178b0 Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20221010175511.3414357-3-hpoussin@reactos.org> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-10-27vvfat: allow some writes to bootsectorHervé Poussineau
'reserved1' field in bootsector is used to mark volume dirty, or need to verify. Allow writes to bootsector which only changes the 'reserved1' field. This fixes I/O errors on Windows guests. Resolves: https://bugs.launchpad.net/qemu/+bug/1889421 Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Message-Id: <20221010175511.3414357-2-hpoussin@reactos.org> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-10-27block: Refactor get_tmp_filename()Bin Meng
At present there are two callers of get_tmp_filename() and they are inconsistent. One does: /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ char *tmp_filename = g_malloc0(PATH_MAX + 1); ... ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); while the other does: s->qcow_filename = g_malloc(PATH_MAX); ret = get_tmp_filename(s->qcow_filename, PATH_MAX); As we can see different 'size' arguments are passed. There are also platform specific implementations inside the function, and the use of snprintf is really undesirable. The function name is also misleading. It creates a temporary file, not just a filename. Refactor this routine by changing its name and signature to: char *create_tmp_file(Error **errp) and use g_get_tmp_dir() / g_mkstemp() for a consistent implementation. While we are here, add some comments to mention that /var/tmp is preferred over /tmp on non-win32 hosts. Signed-off-by: Bin Meng <bin.meng@windriver.com> Message-Id: <20221010040432.3380478-2-bin.meng@windriver.com> [kwolf: Fixed incorrect errno negation and iotest 051] Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-07-12block: Change bdrv_{pread,pwrite,pwrite_sync}() param orderAlberto Faria
Swap 'buf' and 'bytes' around for consistency with bdrv_co_{pread,pwrite}(), and in preparation to implement these functions using generated_co_wrapper. Callers were updated using this Coccinelle script: @@ expression child, offset, buf, bytes, flags; @@ - bdrv_pread(child, offset, buf, bytes, flags) + bdrv_pread(child, offset, bytes, buf, flags) @@ expression child, offset, buf, bytes, flags; @@ - bdrv_pwrite(child, offset, buf, bytes, flags) + bdrv_pwrite(child, offset, bytes, buf, flags) @@ expression child, offset, buf, bytes, flags; @@ - bdrv_pwrite_sync(child, offset, buf, bytes, flags) + bdrv_pwrite_sync(child, offset, bytes, buf, flags) Resulting overly-long lines were then fixed by hand. Signed-off-by: Alberto Faria <afaria@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Message-Id: <20220609152744.3891847-3-afaria@redhat.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
2022-07-12block: Add a 'flags' param to bdrv_{pread,pwrite,pwrite_sync}()Alberto Faria
For consistency with other I/O functions, and in preparation to implement them using generated_co_wrapper. Callers were updated using this Coccinelle script: @@ expression child, offset, buf, bytes; @@ - bdrv_pread(child, offset, buf, bytes) + bdrv_pread(child, offset, buf, bytes, 0) @@ expression child, offset, buf, bytes; @@ - bdrv_pwrite(child, offset, buf, bytes) + bdrv_pwrite(child, offset, buf, bytes, 0) @@ expression child, offset, buf, bytes; @@ - bdrv_pwrite_sync(child, offset, buf, bytes) + bdrv_pwrite_sync(child, offset, buf, bytes, 0) Resulting overly-long lines were then fixed by hand. Signed-off-by: Alberto Faria <afaria@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Message-Id: <20220609152744.3891847-2-afaria@redhat.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
2022-01-14vvfat: Fix vvfat_write() for writes before the root directoryKevin Wolf
The calculation in sector2cluster() is done relative to the offset of the root directory. Any writes to blocks before the start of the root directory (in particular, writes to the FAT) result in negative values, which are not handled correctly in vvfat_write(). This changes sector2cluster() to return a signed value, and makes sure that vvfat_write() doesn't try to find mappings for negative cluster number. It clarifies the code in vvfat_write() to make it more obvious that the cluster numbers can be negative. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20211209152231.23756-1-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-01-14vvfat: Fix size of temporary qcow fileKevin Wolf
The size of the qcow size was calculated so that only the FAT partition would fit on it, but not the whole disk. However, offsets relative to the whole disk are used to access it, so increase its size to be large enough for that. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20211209151815.23495-1-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-11-23block/vvfat.c fix leak when failure occursDaniella Lee
Function vvfat_open called function enable_write_target and init_directories, and these functions malloc new memory for BDRVVVFATState::qcow_filename, BDRVVVFATState::used_clusters, and BDRVVVFATState::cluster_buff. When the specified folder does not exist ,it may contains memory leak. After init_directories function is executed, the vvfat_open return -EIO, and bdrv_open_driver goto label open_failed, the program use g_free(bs->opaque) to release BDRVVVFATState struct without members mentioned. command line: qemu-system-x86_64 -hdb <vdisk qcow file> -usb -device usb-storage,drive=fat16 -drive file=fat:rw:fat-type=16:"<path of a host folder does not exist>", id=fat16,format=raw,if=none enable_write_target called: (gdb) bt at ../block/vvfat.c:3114 flags=155650, errp=0x7fffffffd780) at ../block/vvfat.c:1236 node_name=0x0, options=0x555556fa45d0, open_flags=155650, errp=0x7fffffffd890) at ../block.c:1558 errp=0x7fffffffd890) at ../block.c:1852 reference=0x0, options=0x555556fa45d0, flags=40962, parent=0x555556f98cd0, child_class=0x555556b1d6a0 <child_of_bds>, child_role=19, errp=0x7fffffffda90) at ../block.c:3779 options=0x555556f9cfc0, bdref_key=0x555556239bb8 "file", parent=0x555556f98cd0, child_class=0x555556b1d6a0 <child_of_bds>, child_role=19, allow_none=true, errp=0x7fffffffda90) at ../block.c:3419 reference=0x0, options=0x555556f9cfc0, flags=8194, parent=0x0, child_class=0x0, child_role=0, errp=0x555556c98c40 <error_fatal>) at ../block.c:3726 options=0x555556f757b0, flags=0, errp=0x555556c98c40 <error_fatal>) at ../block.c:3872 options=0x555556f757b0, flags=0, errp=0x555556c98c40 <error_fatal>) at ../block/block-backend.c:436 bs_opts=0x555556f757b0, errp=0x555556c98c40 <error_fatal>) at ../blockdev.c:608 errp=0x555556c98c40 <error_fatal>) at ../blockdev.c:992 ...... Signed-off-by: Daniella Lee <daniellalee111@gmail.com> Message-Id: <20211119112553.352222-1-daniellalee111@gmail.com> [hreitz: Took commit message from v1] Signed-off-by: Hanna Reitz <hreitz@redhat.com>
2021-09-29block: use int64_t instead of uint64_t in driver write handlersVladimir Sementsov-Ogievskiy
We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). So, convert driver write handlers parameters which are already 64bit to signed type. While being here, convert also flags parameter to be BdrvRequestFlags. Now let's consider all callers. Simple git grep '\->bdrv_\(aio\|co\)_pwritev\(_part\)\?' shows that's there three callers of driver function: bdrv_driver_pwritev() and bdrv_driver_pwritev_compressed() in block/io.c, both pass int64_t, checked by bdrv_check_qiov_request() to be non-negative. qcow2_save_vmstate() does bdrv_check_qiov_request(). Still, the functions may be called directly, not only by drv->... Let's check: git grep '\.bdrv_\(aio\|co\)_pwritev\(_part\)\?\s*=' | \ awk '{print $4}' | sed 's/,//' | sed 's/&//' | sort | uniq | \ while read func; do git grep "$func(" | \ grep -v "$func(BlockDriverState"; done shows several callers: qcow2: qcow2_co_truncate() write at most up to @offset, which is checked in generic qcow2_co_truncate() by bdrv_check_request(). qcow2_co_pwritev_compressed_task() pass the request (or part of the request) that already went through normal write path, so it should be OK qcow: qcow_co_pwritev_compressed() pass int64_t, it's updated by this patch quorum: quorum_co_pwrite_zeroes() pass int64_t and int - OK throttle: throttle_co_pwritev_compressed() pass int64_t, it's updated by this patch vmdk: vmdk_co_pwritev_compressed() pass int64_t, it's updated by this patch Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210903102807.27127-5-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
2021-09-29block: use int64_t instead of uint64_t in driver read handlersVladimir Sementsov-Ogievskiy
We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). So, convert driver read handlers parameters which are already 64bit to signed type. While being here, convert also flags parameter to be BdrvRequestFlags. Now let's consider all callers. Simple git grep '\->bdrv_\(aio\|co\)_preadv\(_part\)\?' shows that's there three callers of driver function: bdrv_driver_preadv() in block/io.c, passes int64_t, checked by bdrv_check_qiov_request() to be non-negative. qcow2_load_vmstate() does bdrv_check_qiov_request(). do_perform_cow_read() has uint64_t argument. And a lot of things in qcow2 driver are uint64_t, so converting it is big job. But we must not work with requests that don't satisfy bdrv_check_qiov_request(), so let's just assert it here. Still, the functions may be called directly, not only by drv->... Let's check: git grep '\.bdrv_\(aio\|co\)_preadv\(_part\)\?\s*=' | \ awk '{print $4}' | sed 's/,//' | sed 's/&//' | sort | uniq | \ while read func; do git grep "$func(" | \ grep -v "$func(BlockDriverState"; done The only one such caller: QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, &data, 1); ... ret = bdrv_replace_test_co_preadv(bs, 0, 1, &qiov, 0); in tests/unit/test-bdrv-drain.c, and it's OK obviously. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210903102807.27127-4-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> [eblake: fix typos] Signed-off-by: Eric Blake <eblake@redhat.com>
2021-07-20block/vvfat: fix: drop backingVladimir Sementsov-Ogievskiy
Most probably this fake backing child doesn't work anyway (see notes about it in a8a4d15c1c34d). Still, since 25f78d9e2de528473d52 drivers are required to set .supports_backing if they want to call bdrv_set_backing_hd, so now vvfat just doesn't work because of this check. Let's finally drop this fake backing file. Fixes: 25f78d9e2de528473d52acfcf7acdfb64e3453d4 Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210715124853.13335-1-vsementsov@virtuozzo.com> Tested-by: John Arbuckle <programmingkidx@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-06-02block/vvfat: inherit child_vvfat_qcow from child_of_bdsVladimir Sementsov-Ogievskiy
Recently we've fixed a crash by adding .get_parent_aio_context handler to child_vvfat_qcow. Now we want it to support .get_parent_desc as well. child_vvfat_qcow wants to implement own .inherit_options, it's not bad. But omitting all other handlers is a bad idea. Let's inherit the class from child_of_bds instead, similar to chain_child_class and detach_by_driver_cb_class in test-bdrv-drain.c. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210601075218.79249-5-vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-06-02block/vvfat: fix vvfat_child_perm crashVladimir Sementsov-Ogievskiy
It's wrong to rely on s->qcow in vvfat_child_perm, as on permission update during bdrv_open_child() call this field is not set yet. Still prior to aa5a04c7db27eea6b36de32f241b155f0d9ce34d, it didn't crash, as bdrv_open_child passed NULL as child to bdrv_child_perm(), and NULL was equal to NULL in assertion (still, it was bad guarantee for child being s->qcow, not backing :). Since aa5a04c7db27eea6b36de32f241b155f0d9ce34d "add bdrv_attach_child_noperm" bdrv_refresh_perms called on parent node when attaching child, and new correct child pointer is passed to .bdrv_child_perm. Still, s->qcow is NULL at the moment. Let's rely only on role instead. Without that fix, ./build/qemu-system-x86_64 -usb -device usb-storage,drive=fat16 \ -drive \ file=fat:rw:fat-type=16:"<path of a host folder>",id=fat16,format=raw,if=none crashes: (gdb) bt 0 raise () at /lib64/libc.so.6 1 abort () at /lib64/libc.so.6 2 _nl_load_domain.cold () at /lib64/libc.so.6 3 annobin_assert.c_end () at /lib64/libc.so.6 4 vvfat_child_perm (bs=0x559186f3d690, c=0x559186f1ed20, role=3, reopen_queue=0x0, perm=0, shared=31, nperm=0x7ffe56f28298, nshared=0x7ffe56f282a0) at ../block/vvfat.c:3214 5 bdrv_child_perm (bs=0x559186f3d690, child_bs=0x559186f60190, c=0x559186f1ed20, role=3, reopen_queue=0x0, parent_perm=0, parent_shared=31, nperm=0x7ffe56f28298, nshared=0x7ffe56f282a0) at ../block.c:2094 6 bdrv_node_refresh_perm (bs=0x559186f3d690, q=0x0, tran=0x559186f65850, errp=0x7ffe56f28530) at ../block.c:2336 7 bdrv_list_refresh_perms (list=0x559186db5b90 = {...}, q=0x0, tran=0x559186f65850, errp=0x7ffe56f28530) at ../block.c:2358 8 bdrv_refresh_perms (bs=0x559186f3d690, errp=0x7ffe56f28530) at ../block.c:2419 9 bdrv_attach_child (parent_bs=0x559186f3d690, child_bs=0x559186f60190, child_name=0x559184d83e3d "write-target", child_class=0x5591852f3b00 <child_vvfat_qcow>, child_role=3, errp=0x7ffe56f28530) at ../block.c:2959 10 bdrv_open_child (filename=0x559186f5cb80 "/var/tmp/vl.7WYmFU", options=0x559186f66c20, bdref_key=0x559184d83e3d "write-target", parent=0x559186f3d690, child_class=0x5591852f3b00 <child_vvfat_qcow>, child_role=3, allow_none=false, errp=0x7ffe56f28530) at ../block.c:3351 11 enable_write_target (bs=0x559186f3d690, errp=0x7ffe56f28530) at ../block/vvfat.c:3177 12 vvfat_open (bs=0x559186f3d690, options=0x559186f42db0, flags=155650, errp=0x7ffe56f28530) at ../block/vvfat.c:1236 13 bdrv_open_driver (bs=0x559186f3d690, drv=0x5591853d97e0 <bdrv_vvfat>, node_name=0x0, options=0x559186f42db0, open_flags=155650, errp=0x7ffe56f28640) at ../block.c:1557 14 bdrv_open_common (bs=0x559186f3d690, file=0x0, options=0x559186f42db0, errp=0x7ffe56f28640) at ../block.c:1833 ... (gdb) fr 4 #4 vvfat_child_perm (bs=0x559186f3d690, c=0x559186f1ed20, role=3, reopen_queue=0x0, perm=0, shared=31, nperm=0x7ffe56f28298, nshared=0x7ffe56f282a0) at ../block/vvfat.c:3214 3214 assert(c == s->qcow || (role & BDRV_CHILD_COW)); (gdb) p role $1 = 3 # BDRV_CHILD_DATA | BDRV_CHILD_METADATA (gdb) p *c $2 = {bs = 0x559186f60190, name = 0x559186f669d0 "write-target", klass = 0x5591852f3b00 <child_vvfat_qcow>, role = 3, opaque = 0x559186f3d690, perm = 3, shared_perm = 4, frozen = false, parent_quiesce_counter = 0, next = {le_next = 0x0, le_prev = 0x559186f41818}, next_parent = {le_next = 0x0, le_prev = 0x559186f64320}} (gdb) p s->qcow $3 = (BdrvChild *) 0x0 Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210524101257.119377-3-vsementsov@virtuozzo.com> Tested-by: John Arbuckle <programmingkidx@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-06-02block/vvfat: child_vvfat_qcow: add .get_parent_aio_context, fix crashVladimir Sementsov-Ogievskiy
Commit 3ca1f3225727419ba573673b744edac10904276f "block: BdrvChildClass: add .get_parent_aio_context handler" introduced new handler and commit 228ca37e12f97788e05bd0c92f89b3e5e4019607 "block: drop ctx argument from bdrv_root_attach_child" made a generic use of it. But 3ca1f3225727419ba573673b744edac10904276f didn't update child_vvfat_qcow. Fix that. Before that fix the command ./build/qemu-system-x86_64 -usb -device usb-storage,drive=fat16 \ -drive file=fat:rw:fat-type=16:"<path of a host folder>",id=fat16,format=raw,if=none crashes: 1 bdrv_child_get_parent_aio_context (c=0x559d62426d20) at ../block.c:1440 2 bdrv_attach_child_common (child_bs=0x559d62468190, child_name=0x559d606f9e3d "write-target", child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3, perm=3, shared_perm=4, opaque=0x559d62445690, child=0x7ffc74c2acc8, tran=0x559d6246ddd0, errp=0x7ffc74c2ae60) at ../block.c:2795 3 bdrv_attach_child_noperm (parent_bs=0x559d62445690, child_bs=0x559d62468190, child_name=0x559d606f9e3d "write-target", child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3, child=0x7ffc74c2acc8, tran=0x559d6246ddd0, errp=0x7ffc74c2ae60) at ../block.c:2855 4 bdrv_attach_child (parent_bs=0x559d62445690, child_bs=0x559d62468190, child_name=0x559d606f9e3d "write-target", child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3, errp=0x7ffc74c2ae60) at ../block.c:2953 5 bdrv_open_child (filename=0x559d62464b80 "/var/tmp/vl.h3TIS4", options=0x559d6246ec20, bdref_key=0x559d606f9e3d "write-target", parent=0x559d62445690, child_class=0x559d60c58d20 <child_vvfat_qcow>, child_role=3, allow_none=false, errp=0x7ffc74c2ae60) at ../block.c:3351 6 enable_write_target (bs=0x559d62445690, errp=0x7ffc74c2ae60) at ../block/vvfat.c:3176 7 vvfat_open (bs=0x559d62445690, options=0x559d6244adb0, flags=155650, errp=0x7ffc74c2ae60) at ../block/vvfat.c:1236 8 bdrv_open_driver (bs=0x559d62445690, drv=0x559d60d4f7e0 <bdrv_vvfat>, node_name=0x0, options=0x559d6244adb0, open_flags=155650, errp=0x7ffc74c2af70) at ../block.c:1557 9 bdrv_open_common (bs=0x559d62445690, file=0x0, options=0x559d6244adb0, errp=0x7ffc74c2af70) at ... (gdb) fr 1 #1 0x0000559d603ea3bf in bdrv_child_get_parent_aio_context (c=0x559d62426d20) at ../block.c:1440 1440 return c->klass->get_parent_aio_context(c); (gdb) p c->klass $1 = (const BdrvChildClass *) 0x559d60c58d20 <child_vvfat_qcow> (gdb) p c->klass->get_parent_aio_context $2 = (AioContext *(*)(BdrvChild *)) 0x0 Fixes: 3ca1f3225727419ba573673b744edac10904276f Fixes: 228ca37e12f97788e05bd0c92f89b3e5e4019607 Reported-by: John Arbuckle <programmingkidx@gmail.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210524101257.119377-2-vsementsov@virtuozzo.com> Tested-by: John Arbuckle <programmingkidx@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-11-03block/vvfat: Fix bad printf format specifiersAlexChen
We should use printf format specifier "%u" instead of "%d" for argument of type "unsigned int". In addition, fix two error format problems found by checkpatch.pl: ERROR: space required after that ',' (ctx:VxV) + fprintf(stderr,"%s attributes=0x%02x begin=%u size=%d\n", ^ ERROR: line over 90 characters + fprintf(stderr, "%d, %s (%u, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Alex Chen <alex.chen@huawei.com> Message-Id: <5FA12620.6030705@huawei.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-09-16util: rename qemu_open() to qemu_open_old()Daniel P. Berrangé
We want to introduce a new version of qemu_open() that uses an Error object for reporting problems and make this it the preferred interface. Rename the existing method to release the namespace for the new impl. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-07-10error: Avoid error_propagate() after migrate_add_blocker()Markus Armbruster
When migrate_add_blocker(blocker, &errp) is followed by error_propagate(errp, err), we can often just as well do migrate_add_blocker(..., errp). Do that with this Coccinelle script: @@ expression blocker, err, errp; expression ret; @@ - ret = migrate_add_blocker(blocker, &err); - if (err) { + ret = migrate_add_blocker(blocker, errp); + if (ret < 0) { ... when != err; - error_propagate(errp, err); ... } @@ expression blocker, err, errp; @@ - migrate_add_blocker(blocker, &err); - if (err) { + if (migrate_add_blocker(blocker, errp) < 0) { ... when != err; - error_propagate(errp, err); ... } Double-check @err is not used afterwards. Dereferencing it would be use after free, but checking whether it's null would be legitimate. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20200707160613.848843-43-armbru@redhat.com>
2020-07-10error: Eliminate error_propagate() with Coccinelle, part 2Markus Armbruster
When all we do with an Error we receive into a local variable is propagating to somewhere else, we can just as well receive it there right away. The previous commit did that with a Coccinelle script I consider fairly trustworthy. This commit uses the same script with the matching of return taken out, i.e. we convert if (!foo(..., &err)) { ... error_propagate(errp, err); ... } to if (!foo(..., errp)) { ... ... } This is unsound: @err could still be read between afterwards. I don't know how to express "no read of @err without an intervening write" in Coccinelle. Instead, I manually double-checked for uses of @err. Suboptimal line breaks tweaked manually. qdev_realize() simplified further to placate scripts/checkpatch.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200707160613.848843-36-armbru@redhat.com>
2020-07-10qemu-option: Use returned bool to check for failureMarkus Armbruster
The previous commit enables conversion of foo(..., &err); if (err) { ... } to if (!foo(..., &err)) { ... } for QemuOpts functions that now return true / false on success / error. Coccinelle script: @@ identifier fun = { opts_do_parse, parse_option_bool, parse_option_number, parse_option_size, qemu_opt_parse, qemu_opt_rename, qemu_opt_set, qemu_opt_set_bool, qemu_opt_set_number, qemu_opts_absorb_qdict, qemu_opts_do_parse, qemu_opts_from_qdict_entry, qemu_opts_set, qemu_opts_validate }; expression list args, args2; typedef Error; Error *err; @@ - fun(args, &err, args2); - if (err) + if (!fun(args, &err, args2)) { ... } A few line breaks tidied up manually. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20200707160613.848843-15-armbru@redhat.com> [Conflict with commit 0b6786a9c1 "block/amend: refactor qcow2 amend options" resolved by rerunning Coccinelle on master's version]
2020-07-03vvfat: Fix array_remove_slice()Kevin Wolf
array_remove_slice() calls array_roll() with array->next - 1 as the destination index. This is only correct for count == 1, otherwise we're writing past the end of the array. array->next - count would be correct. However, this is the only place ever calling array_roll(), so this rather complicated operation isn't even necessary. Fix the problem and simplify the code by replacing it with a single memmove() call. array_roll() can now be removed. Reported-by: Nathan Huckleberry <nhuck15@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200623175534.38286-3-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-07-03vvfat: Check that updated filenames are validKevin Wolf
FAT allows only a restricted set of characters in file names, and for some of the illegal characters, it's actually important that we catch them: If filenames can contain '/', the guest can construct filenames containing "../" and escape from the assigned vvfat directory. The same problem could arise if ".." was ever accepted as a literal filename. Fix this by adding a check that all filenames are valid in check_directory_consistency(). Reported-by: Nathan Huckleberry <nhuck15@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200623175534.38286-2-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Drop @child_class from bdrv_child_perm()Max Reitz
Implementations should decide the necessary permissions based on @role. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513110544.176672-35-mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Pass BdrvChildRole in remaining casesMax Reitz
These calls have no real use for the child role yet, but it will not harm to give one. Notably, the bdrv_root_attach_child() call in blockjob.c is left unmodified because there is not much the generic BlockJob object wants from its children. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513110544.176672-34-mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Make backing files child_of_bds childrenMax Reitz
Make all parents of backing files pass the appropriate BdrvChildRole. By doing so, we can switch their BdrvChildClass over to the generic child_of_bds, which will do the right thing when given a correct BdrvChildRole. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513110544.176672-24-mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Pass parent_is_format to .inherit_options()Max Reitz
We plan to unify the generic .inherit_options() functions. The resulting common function will need to decide whether to force-enable format probing, force-disable it, or leave it as-is. To make this decision, it will need to know whether the parent node is a format node or not (because we never want format probing if the parent is a format node already (except for the backing chain)). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-9-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Pass BdrvChildRole to .inherit_options()Max Reitz
For now, all callers (effectively) pass 0 and no callee evaluates thie value. Later patches will change both. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-8-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Pass BdrvChildRole to bdrv_child_perm()Max Reitz
For now, all callers pass 0 and no callee evaluates this value. Later patches will change both. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-7-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Add BdrvChildRole to BdrvChildMax Reitz
For now, it is always set to 0. Later patches in this series will ensure that all callers pass an appropriate combination of flags. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-6-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Rename BdrvChildRole to BdrvChildClassMax Reitz
This structure nearly only contains parent callbacks for child state changes. It cannot really reflect a child's role, because different roles may overlap (as we will see when real roles are introduced), and because parents can have custom callbacks even when the child fulfills a standard role. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Message-Id: <20200513110544.176672-4-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-18block: Use bdrv_make_empty() where possibleMax Reitz
Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200429141126.85159-3-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-05-05block: Comment cleanupsEric Blake
It's been a while since we got rid of the sector-based bdrv_read and bdrv_write (commit 2e11d756); let's finish the job on a few remaining comments. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200428213807.776655-1-eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2020-02-18block/vvfat: Do not unref qcow on closing backing bdrvHikaru Nishida
Before this commit, BDRVVVFATState.qcow is unrefed in write_target_close on closing backing bdrv of vvfat. However, qcow bdrv is opend as a child of vvfat in enable_write_target() so it will be also unrefed on closing vvfat itself. This causes use-after-free of qcow on freeing vvfat which has backing bdrv and qcow bdrv as children in this order because bdrv_close(vvfat) tries to free qcow bdrv after freeing backing bdrv as QLIST_FOREACH_SAFE() loop keeps next pointer, but BdrvChild of qcow is already freed in bdrv_close(backing bdrv). Signed-off-by: Hikaru Nishida <hikarupsp@gmail.com> Message-Id: <20200209175156.85748-1-hikarupsp@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2019-09-16block: Use QEMU_IS_ALIGNEDNir Soffer
Replace instances of: (n & (BDRV_SECTOR_SIZE - 1)) == 0 And: (n & ~BDRV_SECTOR_MASK) == 0 With: QEMU_IS_ALIGNED(n, BDRV_SECTOR_SIZE) Which reveals the intent of the code better, and makes it easier to locate the code checking alignment. Signed-off-by: Nir Soffer <nsoffer@redhat.com> Message-id: 20190827185913.27427-2-nsoffer@redhat.com Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2019-06-11qemu-common: Move qemu_isalnum() etc. to qemu/ctype.hMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-3-armbru@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-05-10vvfat: Replace bdrv_{read,write}() with bdrv_{pread,pwrite}()Alberto Garcia
There's only a couple of bdrv_read() and bdrv_write() calls left in the vvfat code, and they can be trivially replaced with the byte-based bdrv_pread() and bdrv_pwrite(). Signed-off-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2019-02-25block: Add strong_runtime_opts to BlockDriverMax Reitz
This new field can be set by block drivers to list the runtime options they accept that may influence the contents of the respective BDS. As of a follow-up patch, this list will be used by the common bdrv_refresh_filename() implementation to decide which options to put into BDS.full_open_options (and consequently whether a JSON filename has to be created), thus freeing the drivers of having to implement that logic themselves. Additionally, this patch adds the field to all of the block drivers that need it and sets it accordingly. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Message-id: 20190201192935.18394-22-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2018-11-19vvfat: Fix memory leakKevin Wolf
Don't leak 'cluster' in the mapping == NULL case. Found by Coverity (CID 1055918). Fixes: 8d9401c2791ee2d2805b741b1ee3006041edcd3e Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2018-11-12block: Fix potential Null pointer dereferences in vvfat.cLiam Merwick
The calls to find_mapping_for_cluster() may return NULL but it isn't always checked for before dereferencing the value returned. Additionally, add some asserts to cover cases where NULL can't be returned but which might not be obvious at first glance. Signed-off-by: Liam Merwick <Liam.Merwick@oracle.com> Message-id: 1541453919-25973-5-git-send-email-Liam.Merwick@oracle.com [mreitz: Dropped superfluous check of "mapping" following an assertion that it is not NULL, and fixed some indentation] Signed-off-by: Max Reitz <mreitz@redhat.com>
2018-11-05block: Require auto-read-only for existing fallbacksKevin Wolf
Some block drivers have traditionally changed their node to read-only mode without asking the user. This behaviour has been marked deprecated since 2.11, expecting users to provide an explicit read-only=on option. Now that we have auto-read-only=on, enable these drivers to make use of the option. This is the only use of bdrv_set_read_only(), so we can make it a bit more specific and turn it into a bdrv_apply_auto_read_only() that is more convenient for drivers to use. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2018-11-05block: Add auto-read-only optionKevin Wolf
If a management application builds the block graph node by node, the protocol layer doesn't inherit its read-only option from the format layer any more, so it must be set explicitly. Backing files should work on read-only storage, but at the same time, a block job like commit should be able to reopen them read-write if they are on read-write storage. However, without option inheritance, reopen only changes the read-only option for the root node (typically the format layer), but not the protocol layer, so reopening fails (the format layer wants to get write permissions, but the protocol layer is still read-only). A simple workaround for the problem in the management tool would be to open the protocol layer always read-write and to make only the format layer read-only for backing files. However, sometimes the file is actually stored on read-only storage and we don't know whether the image can be opened read-write (for example, for NBD it depends on the server we're trying to connect to). This adds an option that makes QEMU try to open the image read-write, but allows it to degrade to a read-only mode without returning an error. The documentation for this option is consciously phrased in a way that allows QEMU to switch to a better model eventually: Instead of trying when the image is first opened, making the read-only flag dynamic and changing it automatically whenever the first BLK_PERM_WRITE user is attached or the last one is detached would be much more useful behaviour. Unfortunately, this more useful behaviour is also a lot harder to implement, and libvirt needs a solution now before it can switch to -blockdev, so let's start with this easier approach for now. Instead of adding a new auto-read-only option, turning the existing read-only into an enum (with a bool alternate for compatibility) was considered, but it complicated the implementation to the point that it didn't seem to be worth it. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2018-11-05block/vvfat: Fix crash when reporting error about too many files in directoryThomas Huth
When using the vvfat driver with a directory that contains too many files, QEMU currently crashes. This can be triggered like this for example: mkdir /tmp/vvfattest cd /tmp/vvfattest for ((x=0;x<=513;x++)); do mkdir $x; done qemu-system-x86_64 -drive \ file.driver=vvfat,file.dir=.,read-only=on,media=cdrom Seems like read_directory() is changing the mapping->path variable. Make sure we use the right pointer instead. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-23block/vvfat: Disable debug message by defaultThomas Huth
It's annoying to see this debug message every time you use vvfat. Disable it with the DLOG() macro by default, as it is done with the other debug messages in this file. Signed-off-by: Thomas Huth <thuth@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-06-18block: ignore_bds_parents parameter for drain functionsKevin Wolf
In the future, bdrv_drained_all_begin/end() will drain all invidiual nodes separately rather than whole subtrees. This means that we don't want to propagate the drain to all parents any more: If the parent is a BDS, it will already be drained separately. Recursing to all parents is unnecessary work and would make it an O(n²) operation. Prepare the drain function for the changed drain_all by adding an ignore_bds_parents parameter to the internal implementation that prevents the propagation of the drain to BDS parents. We still (have to) propagate it to non-BDS parents like BlockBackends or Jobs because those are not drained separately. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-06-15block: Add block-specific QDict headerMax Reitz
There are numerous QDict functions that have been introduced for and are used only by the block layer. Move their declarations into an own header file to reflect that. While qdict_extract_subqdict() is in fact used outside of the block layer (in util/qemu-config.c), it is still a function related very closely to how the block layer works with nested QDicts, namely by sometimes flattening them. Therefore, its declaration is put into this header as well and util/qemu-config.c includes it with a comment stating exactly which function it needs. Suggested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20180509165530.29561-7-mreitz@redhat.com> [Copyright note tweaked, superfluous includes dropped] Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-05-04qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREFMarc-André Lureau
Now that we can safely call QOBJECT() on QObject * as well as its subtypes, we can have macros qobject_ref() / qobject_unref() that work everywhere instead of having to use QINCREF() / QDECREF() for QObject and qobject_incref() / qobject_decref() for its subtypes. The replacement is mechanical, except I broke a long line, and added a cast in monitor_qmp_cleanup_req_queue_locked(). Unlike qobject_decref(), qobject_unref() doesn't accept void *. Note that the new macros evaluate their argument exactly once, thus no need to shout them. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180419150145.24795-4-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Rebased, semantic conflict resolved, commit message improved] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-03-19vvfat: Fix inherit_options flagsFam Zheng
Overriding flags violates the precedence rules of bdrv_reopen_queue_child. Just like the read-only option, no-flush should be put into the options. The same is done in bdrv_temp_snapshot_options. Reported-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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