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2014-01-24block: Update BlockLimits when they might have changedKevin Wolf3-1/+7
When reopening with different flags, or when backing files disappear from the chain, the limits may change. Make sure they get updated in these cases. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit@irqsave.net>
2014-01-24block: Inherit opt_transfer_lengthKevin Wolf1-1/+19
When there is a format driver between the backend, it's not guaranteed that exposing the opt_transfer_length for the format driver results in the optimal requests (because of fragmentation etc.), but it can't make things worse, so let's just do it. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit@irqsave.net>
2014-01-24block: Move initialisation of BlockLimits to bdrv_refresh_limits()Kevin Wolf6-23/+87
This function separates filling the BlockLimits from bdrv_open(), which allows it to call it from other operations which may change the limits (e.g. modifications to the backing file chain or bdrv_reopen) Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-01-24block: Fix bdrv_commit return valueKevin Wolf1-5/+10
bdrv_commit() could return 0 or 1 on success, depending on whether or not the last sector was allocated in the overlay and whether the overlay format had a .bdrv_make_empty callback. Most callers ignored it, but qemu-img commit would print an error message while the operation actually succeeded. Also clean up the handling of I/O errors to return the real error code instead of -EIO. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-01-24block: update block commit documentation regarding image truncationJeff Cody4-1/+57
This updates the documentation for commiting snapshot images. Specifically, this highlights what happens when the base image is either smaller or larger than the snapshot image being committed. In the case of the base image being smaller, it is resized to the larger size of the snapshot image. In the case of the base image being larger, it is not resized automatically, but once the commit has completed it is safe for the user to truncate the base image. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block: resize backing image during active layer commit, if neededJeff Cody1-0/+38
If the top image to commit is the active layer, and also larger than the base image, then an I/O error will likely be returned during block-commit. For instance, if we have a base image with a virtual size 10G, and a active layer image of size 20G, then committing the snapshot via 'block-commit' will likely fail. This will automatically attempt to resize the base image, if the active layer image to be committed is larger. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block: resize backing file image during offline commit, if necessaryJeff Cody1-3/+25
Currently, if an image file is logically larger than its backing file, committing it via 'qemu-img commit' will fail. For instance, if we have a base image with a virtual size 10G, and a snapshot image of size 20G, then committing the snapshot offline with 'qemu-img commit' will likely fail. This will automatically attempt to resize the base image, if the snapshot image to be committed is larger. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block/curl: Implement the libcurl timer callback interfacePeter Maydell1-11/+70
libcurl versions 7.16.0 and later have a timer callback interface which must be implemented in order for libcurl to make forward progress (it will sometimes rely on being called back on the timeout if there are no file descriptors registered). Implement the callback, and use a QEMU AIO timer to ensure we prod libcurl again when it asks us to. Based on Peter's original patch plus my fix to add curl_multi_timeout_do. Should compile just fine even on older versions of libcurl. I also tried copy-on-read and streaming: $ ./qemu-img create -f qcow2 -o \ backing_file=http://download.fedoraproject.org/pub/fedora/linux/releases/20/Live/x86_64/Fedora-Live-Desktop-x86_64-20-1.iso \ foo.qcow2 1G $ x86_64-softmmu/qemu-system-x86_64 \ -drive if=none,file=foo.qcow2,copy-on-read=on,id=cd \ -device ide-cd,drive=cd --enable-kvm -m 1024 Direct http usage is probably too slow, but with copy-on-read ultimately the image does boot! After some time, streaming gets canceled by an EIO, which needs further investigation. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qmp: Allow to take external snapshots on bs graphs node.Benoît Canet4-12/+71
Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qmp: Allow block_resize to manipulate bs graph nodes.Benoît Canet4-8/+25
Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block: Create authorizations mechanism for external snapshot and resize.Benoît Canet5-24/+77
Signed-off-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qmp: Allow to change password on named block driver states.Benoît Canet6-8/+54
Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> There was two candidate ways to implement named node manipulation: 1) { 'command': 'block_passwd', 'data': {'*device': 'str', '*node-name': 'str', 'password': 'str'} } 2) { 'command': 'block_passwd', 'data': {'device': 'str', '*device-is-node': 'bool', 'password': 'str'} } Luiz proposed 1 and says 2 was an abuse of the QMP interface and proposed to rewrite the QMP block interface for 2.0. Luiz does not like in 1 the fact that 2 fields are optional but one of them must be specified leading to an abuse of the QMP semantic. Kevin argumented that 2 what a clear abuse of the device field and would not be practical when reading fast some log file because the user would read "device" and think that a device is manipulated when it's in fact a node name. Documentation of 1 make it pretty clear what to do for the user. Kevin argued that all bs are node including devices ones so 2 does not make sense. Kevin also argued that rewriting the QMP block interface would not make disapear the current one. Kevin pushed the argument that making the QAPI generator compatible with the semantic of the operation would need a rewrite that no one has done yet. A vote has been done on the list to elect the version to use and 1 won. For reference the complete thread is: "[Qemu-devel] [PATCH V4 4/7] qmp: Allow to change password on names block driver states." Signed-off-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qmp: Add QMP query-named-block-nodes to list the named BlockDriverState nodes.Benoît Canet7-56/+155
Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block: Allow the user to define "node-name" option both on command line and QMP.Benoît Canet2-0/+37
Signed-off-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24block: Add bs->node_name to hold the name of a bs node of the bs graph.Benoît Canet3-15/+52
Add the minimum of code to prepare for the following patches. Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qapi: Add "backing" to BlockStatsFam Zheng2-4/+11
Currently there is no way to query BlockStats of the backing chain. This adds "backing" field into BlockStats to make it possible. The comment of "parent" is reworded. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24vmdk: Fix format specific information (create type) for streamOptimizedFam Zheng1-0/+4
Previously the field is wrong: $ ./qemu-img create -f vmdk -o subformat=streamOptimized /tmp/a.vmdk 1G $ ./qemu-img info /tmp/a.vmdk image: /tmp/a.vmdk file format: vmdk virtual size: 1.0G (1073741824 bytes) disk size: 12K Format specific information: cid: 1390460459 parent cid: 4294967295 >>> create type: monolithicSparse <snip> Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24drive mirror:fix memory leakZhang Min1-0/+1
In the function mirror_iteration() -> qemu_iovec_init(), it allocates memory for op->qiov.iov, when the write request calls back, but in the function mirror_iteration_done(), it only frees the op, not free the op->qiov.iov, so this causes memory leak. It should use qemu_iovec_destroy() to free op->qiov. Signed-off-by: Zhang Min <rudy.zhangmin@huawei.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24sheepdog: fix 'qemu-img map'Liu Yuan1-2/+3
It was muted in the previous commit 4bc74be9. Let's revive it since nothing prevents us to do it. With this patch, following command will work as other formats: $ qemu-img map sheepdog:image Cc: qemu-devel@nongnu.org Cc: Kevin Wolf <kwolf@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Liu Yuan <namei.unix@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24Documentation: qemu-img: Mention SIGUSR1 progress reportKevin Wolf1-1/+3
Document the SIGUSR1 behaviour of qemu-img. Also, added compare to the list of subcommands that support -p. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-01-24qemu-progress: Fix progress printing on SIGUSR1Kevin Wolf1-0/+10
Since commit a7aae221 ('Switch SIG_IPI to SIGUSR1'), SIGUSR1 is blocked during startup, breaking the progress report in tools. This patch reenables the signal when initialising a progress report. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-01-24qemu-progress: Drop unused includeKevin Wolf1-1/+0
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-01-24vmdk: Check for overhead when openingFam Zheng3-0/+18
Report an error if file size is even smaller than metadata. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-24qcow2: fix wrong value of L1E_OFFSET_MASK, L2E_OFFSET_MASK and REFT_OFFSET_MASKHu Tao1-3/+3
Accoring to qcow spec, the offset fields in l1e, l2e and ref table entry start at bit 9. The offset is cluster offset, and the smallest possible cluster size is 512 bytes. Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22dataplane: fix shadowed return valueStefan Hajnoczi1-1/+1
Propagate the error return value from get_indirect(). This bug was introduced in commit 4d684832 ("vring: create a common function to parse descriptors"). Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: fix backing file segfaultPeter Feiner1-2/+6
When a backing file is opened such that (1) a protocol is directly used as the block driver and (2) the block driver has bdrv_file_open, bdrv_open_backing_file segfaults. The problem arises because bdrv_open_common returns without setting bd->backing_hd->file. To effect (1), you seem to have to use the -F flag in qemu-img. There are several block drivers that satisfy (2), such as "file" and "nbd". Here are some concrete examples: #!/bin/bash echo Test file format ./qemu-img create -f file base.file 1m ./qemu-img create -f qcow2 -F file -o backing_file=base.file\ file-overlay.qcow2 ./qemu-img convert -O raw file-overlay.qcow2 file-convert.raw echo Test nbd format SOCK=$PWD/nbd.sock ./qemu-img create -f raw base.raw 1m ./qemu-nbd -t -k $SOCK base.raw & trap "kill $!" EXIT while ! test -e $SOCK; do sleep 1; done ./qemu-img create -f qcow2 -F nbd -o backing_file=nbd:unix:$SOCK\ nbd-overlay.qcow2 ./qemu-img convert -O raw nbd-overlay.qcow2 nbd-convert.raw Without this patch, the two qemu-img convert commands segfault. This is a regression that was introduced in v1.7 by dbecebddfa4932d1c83915bcb9b5ba5984eb91be. Signed-off-by: Peter Feiner <peter@gridcentric.ca> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22iotests: Test file format nestingMax Reitz3-0/+91
Add a test for nested image formats. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22iotests: Test new blkdebug/blkverify interfaceMax Reitz3-0/+330
Add a test for the new blkdebug/blkverify interface. This test is not written in Python, although it uses QMP. This is because it invokes the qemu-io HMP command, which outputs errors to stderr instead of returning them through QMP. Filtering and testing that output is easier in a shell script than with the Python infrastructure. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22tests: Add test for qdict_flatten()Max Reitz1-0/+76
Add a test case for qdict_flatten() in tests/check-qdict.c. This test case covers the flattening of subordinate QLists as well. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22tests: Add test for qdict_array_split()Max Reitz1-0/+80
Add a test case for qdict_array_split() in tests/check-qdict.c. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qemu-io: Make filename optionalMax Reitz1-3/+5
Giving a filename is actually not essential, since it can be specified through the options as well - on the contrary: Sometimes a filename must not be given. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qapi: QMP interface for blkdebug and blkverifyMax Reitz1-4/+109
Add structures to support blkdebug and blkverify in blockdev-add. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qapi: Add "errno" to the list of polluted wordsMax Reitz1-1/+1
Using "errno" directly as an identifier results in various syntax errors; therefore it should be added to the list of polluted words. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkverify: Don't require protocol filenameMax Reitz1-1/+3
If the filename is not prefixed by "blkverify:" in blkverify_parse_filename(), the blkverify driver was not selected through that protocol prefix, but by an explicit command line (or QMP) option (like driver=blkverify). If blkverify_parse_filename() has been called, a filename has been given. If it is not prefixed, it is probably really just a plain filename. This is no problem, since we can use it as the test image filename and rely on the user to specify the raw image filename through the new corresponding option. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkverify: Allow command-line configurationMax Reitz1-20/+5
Introduce the "test" and "raw" options for specifying images. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkdebug: Allow command-line file configurationMax Reitz1-9/+3
Introduce the "image" option as an alternative to specifying the image through the filename. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blockdev: Move "file" to legacy_optsMax Reitz1-9/+10
Specifying the image filename through the "file" option is a legacy option and should not be supported by blockdev-add (in that case, giving a string for "file" references an existing block device). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Allow recursive "file"sMax Reitz2-3/+8
It should be possible to use a format as a driver for a file which in turn requires another file, i.e., nesting file formats. Allowing nested file formats results in e.g. qcow2 BlockDriverStates never being directly passed to bdrv_open_common() from bdrv_file_open(), but instead being handed through bdrv_open(). This changes the error message when trying to give a filename to qcow2, i.e. trying to use it as a driver for the protocol level. Therefore, change the reference output of I/O test 051 accordingly. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Use bdrv_open_image() in bdrv_open()Max Reitz1-13/+5
Using bdrv_open_image() instead of bdrv_file_open() directly in bdrv_open() is easier. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Add bdrv_open_image()Max Reitz2-0/+76
Add a common function for opening images to be used for block drivers specified through BlockdevRefs in an option QDict. The difference from bdrv_file_open() is that this function may invoke bdrv_open() instead, allowing auto-detection of the driver to be used; and second, it automatically extracts the BlockdevRef from the option QDict. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Allow block devices without filesMax Reitz1-7/+16
blkdebug and blkverify will, in order to retain compatibility, not support the field "file" implicitly through bdrv_open(). In order to be able to use those drivers without giving a filename anyway, it is necessary to be able to have block devices without files implicitly opened by bdrv_open(). This is the case, if there was neither a file name, a reference to an existing block device to use as a file nor options specific to the file. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Pass reference to bdrv_file_open()Max Reitz1-1/+4
With that now being possible, bdrv_open() should try to extract a block device reference from the options and pass it to bdrv_file_open(). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Allow reference for bdrv_file_open()Max Reitz12-19/+41
Allow specifying a reference to an existing block device (by name) for bdrv_file_open() instead of a filename and/or options. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkdebug: Use command-line in read_config()Max Reitz1-3/+12
Use qemu_config_parse_qdict() to parse the command-line options in addition to the config file. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkdebug: Always call read_config()Max Reitz1-17/+19
Move the check whether there actually is a config file into the read_config() function. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qemu-option: Add qemu_config_parse_qdict()Max Reitz2-0/+106
This function basically parses command-line options given as a QDict replacing a config file. For instance, the QDict {"section.opt1": 42, "section.opt2": 23} corresponds to the config file: [section] opt1 = 42 opt2 = 23 It is possible to specify multiple sections and also multiple sections of the same type. On the command line, this looks like the following: inject-error.0.event=reftable_load,\ inject-error.1.event=l2_load,\ set-state.event=l1_update This would correspond to the following config file: [inject-error "inject-error.0"] event = reftable_load [inject-error "inject-error.1"] event = l2_load [set-state] event = l1_update Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qapi: extend qdict_flatten() for QListsMax Reitz1-6/+48
Reversing qdict_array_split(), qdict_flatten() should flatten QLists as well by interpreting them as QDicts where every entry's key is its index. This allows bringing QDicts with QLists from QMP commands to the same form as they would be given as command-line options, thereby allowing them to be parsed the same way. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qdict: Add qdict_array_split()Max Reitz2-0/+38
This function splits a QDict consisting of entries prefixed by incrementally enumerated indices into a QList of QDicts. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkdebug: Don't require sophisticated filenameMax Reitz1-1/+3
If the filename is not prefixed by "blkdebug:" in blkdebug_parse_filename(), the blkdebug driver was not selected through that protocol prefix, but by an explicit command line option (file.driver=blkdebug or something similar). Contrary to the current reaction, this is not a problem at all; we just need to store the filename (in the x-image option) and can go on; the user just has to manually specify the config option. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22blkdebug: Use errp for read_config()Max Reitz1-4/+6
Use an Error variable in the read_config() function. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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