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2012-11-24block: Fix regression for MinGW (assertion caused by short string)Stefan Weil1-1/+2
The local string tmp_filename is passed to function get_tmp_filename which expects a string with minimum size MAX_PATH for w32 hosts. MAX_PATH is 260 and PATH_MAX is 259, so tmp_filename was too short. Commit eba25057b9a5e19d10ace2bc7716667a31297169 introduced this regression. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-11-14aio: rename AIOPool to AIOCBInfoStefan Hajnoczi1-11/+11
Now that AIOPool no longer keeps a freelist, it isn't really a "pool" anymore. Rename it to AIOCBInfo and make it const since it no longer needs to be modified. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-11-14aio: use g_slice_alloc() for AIOCB poolingStefan Hajnoczi1-11/+4
AIO control blocks are frequently acquired and released because each aio request involves at least one AIOCB. Therefore, we pool them to avoid heap allocation overhead. The problem with the freelist approach in AIOPool is thread-safety. If we want BlockDriverStates to associate with AioContexts that execute in multiple threads, then a global freelist becomes a problem. This patch drops the freelist and instead uses g_slice_alloc() which is tuned for per-thread fixed-size object pools. qemu_aio_get() and qemu_aio_release() are now thread-safe. Note that the change from g_malloc0() to g_slice_alloc() should be safe since the freelist reuse case doesn't zero the AIOCB either. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-29Merge remote-tracking branch 'kwolf/for-anthony' into stagingAnthony Liguori1-97/+210
* kwolf/for-anthony: (32 commits) osdep: Less restrictive F_SEFL in qemu_dup_flags() qemu-iotests: add testcases for mirroring on-source-error/on-target-error qmp: add pull_event function mirror: add support for on-source-error/on-target-error iostatus: forward block_job_iostatus_reset to block job qemu-iotests: add mirroring test case mirror: implement completion qmp: add drive-mirror command mirror: introduce mirror job block: introduce BLOCK_JOB_READY event block: add block-job-complete block: rename block_job_complete to block_job_completed block: export dirty bitmap information in query-block block: introduce new dirty bitmap functionality block: add bdrv_open_backing_file block: add bdrv_query_stats block: add bdrv_query_info qemu-config: Add new -add-fd command line option monitor: Prevent removing fd from set during init monitor: Enable adding an inherited fd to an fd set ... Conflicts: vl.c Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-10-24iostatus: forward block_job_iostatus_reset to block jobPaolo Bonzini1-0/+3
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: export dirty bitmap information in query-blockPaolo Bonzini1-0/+7
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: introduce new dirty bitmap functionalityPaolo Bonzini1-6/+45
Assert that write_compressed is never used with the dirty bitmap. Setting the bits early is wrong, because a coroutine might concurrently examine them and copy incomplete data from the source. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: add bdrv_open_backing_filePaolo Bonzini1-18/+38
Mirroring runs without the backing file so that it can be copied outside QEMU. However, we need to add it at the time the job is completed and QEMU switches to the target. Factor out the common bits of opening an image and completing a mirroring operation. The new function does not assume that the file is closed immediately after it returns failure, so it keeps the BDRV_O_NO_BACKING flag up-to-date. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: add bdrv_query_statsPaolo Bonzini1-12/+6
qmp_query_blockstat cannot have errors, remove the Error argument and create a new public function bdrv_query_stats out of it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: add bdrv_query_infoPaolo Bonzini1-53/+53
Extract it out of the implementation of "info block". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: bdrv_create(): don't leak cco.filename on errorLuiz Capitulino1-2/+4
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: make bdrv_find_backing_image compare canonical filenamesJeff Cody1-6/+54
Currently, bdrv_find_backing_image compares bs->backing_file with what is passed in as a backing_file name. Mismatches may occur, however, when bs->backing_file and backing_file are not both absolute or relative. Use path_combine() to make sure any relative backing filenames are relative to the current image filename being searched, and then use realpath() to make all comparisons based on absolute filenames. If either backing_file or bs->backing_file is determine to be a protocol, then no filename normalization is performed. This also changes bdrv_find_backing_image to no longer be recursive, but iterative. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-23block: add close notifiersPaolo Bonzini1-0/+9
The first user of close notifiers will be the embedded NBD server. It would be possible to use them to do some of the ad hoc processing (e.g. for block jobs and I/O limits) that is currently done by bdrv_close. Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-23block: prepare code for adding block notifiersPaolo Bonzini1-5/+5
There is no reason in principle to skip job cancellation and draining of pending I/O when there is no medium in the disk. Do these unconditionally, which also prepares the code for the next patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-05block: avoid buffer overrun by using pstrcpy, not strncpyJim Meyering1-2/+3
Also, use PATH_MAX, rather than the arbitrary 1024. Using PATH_MAX is more consistent with other filename-related variables in this file, like backing_filename and tmp_filename. Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-09-28block: introduce block job errorPaolo Bonzini1-4/+5
The following behaviors are possible: 'report': The behavior is the same as in 1.1. An I/O error, respectively during a read or a write, will complete the job immediately with an error code. 'ignore': An I/O error, respectively during a read or a write, will be ignored. For streaming, the job will complete with an error and the backing file will be left in place. For mirroring, the sector will be marked again as dirty and re-examined later. 'stop': The job will be paused and the job iostatus will be set to failed or nospace, while the VM will keep running. This can only be specified if the block device has rerror=stop and werror=stop or enospc. 'enospc': Behaves as 'stop' for ENOSPC errors, 'report' for others. In all cases, even for 'report', the I/O error is reported as a QMP event BLOCK_JOB_ERROR, with the same arguments as BLOCK_IO_ERROR. It is possible that while stopping the VM a BLOCK_IO_ERROR event will be reported and will clobber the event from BLOCK_JOB_ERROR, or vice versa. This is not really avoidable since stopping the VM completes all pending I/O requests. In fact, it is already possible now that a series of BLOCK_IO_ERROR events are reported with rerror=stop, because vm_stop calls bdrv_drain_all and this can generate further errors. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: reorganize io error codePaolo Bonzini1-8/+38
Move the common part of IDE/SCSI/virtio error handling to the block layer. The new function bdrv_error_action subsumes all three of bdrv_emit_qmp_error_event, vm_stop, bdrv_iostatus_set_err. The same scheme will be used for errors in block jobs. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: change is_read to a boolPaolo Bonzini1-2/+2
Do this while we are touching this part of the code, before introducing more uses of "int is_read". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: move BlockdevOnError declaration to QAPIPaolo Bonzini1-3/+3
This will let block-stream reuse the enum. Places that used the enums are renamed accordingly. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: rename BlockErrorAction, BlockQMPEventActionPaolo Bonzini1-4/+4
We want to remove knowledge of BLOCK_ERR_STOP_ENOSPC from drivers; drivers should only be told whether to stop/report/ignore the error. On the other hand, we want to keep using the nicer BlockErrorAction name in the drivers. So rename the enums, while leaving aside the names of the enum values for now. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: move job APIs to separate filesPaolo Bonzini1-127/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: helper function, to find the base image of a chainJeff Cody1-0/+16
This is a simple helper function, that will return the base image of a given image chain. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: add support functions for live commit, to find and delete images.Jeff Cody1-0/+143
Add bdrv_find_overlay(), and bdrv_drop_intermediate(). bdrv_find_overlay(): given 'bs' and the active (topmost) BDS of an image chain, find the image that is the immediate top of 'bs' bdrv_drop_intermediate(): Given 3 BDS (active, top, base), drop images above base up to and including top, and set base to be the backing file of top's overlay node. E.g., this converts: bottom <- base <- intermediate <- top <- active to bottom <- base <- active Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: remove keep_read_only flag from BlockDriverState structJeff Cody1-2/+0
The keep_read_only flag is no longer used, in favor of the bdrv flag BDRV_O_ALLOW_RDWR. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: convert bdrv_commit() to use bdrv_reopen()Jeff Cody1-43/+5
Currently, bdrv_commit() reopens images r/w itself, via risky _delete() and _open() calls. Use the new safe method for drive reopen. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: Framework for reopening files safelyJeff Cody1-0/+232
This is based on Supriya Kannery's bdrv_reopen() patch series. This provides a transactional method to reopen multiple images files safely. Image files are queue for reopen via bdrv_reopen_queue(), and the reopen occurs when bdrv_reopen_multiple() is called. Changes are staged in bdrv_reopen_prepare() and in the equivalent driver level functions. If any of the staged images fails a prepare, then all of the images left untouched, and the staged changes for each image abandoned. Block drivers are passed a reopen state structure, that contains: * BDS to reopen * flags for the reopen * opaque pointer for any driver-specific data that needs to be persistent from _prepare to _commit/_abort * reopen queue pointer, if the driver needs to queue additional BDS for a reopen Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: make bdrv_set_enable_write_cache() modify open_flagsJeff Cody1-0/+7
bdrv_set_enable_write_cache() sets the bs->enable_write_cache flag, but without the flag recorded in bs->open_flags, then next time a reopen() is performed the enable_write_cache setting may be inadvertently lost. This will set the flag in open_flags, so it is preserved across reopens. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: correctly set the keep_read_only flagJeff Cody1-7/+7
I believe the bs->keep_read_only flag is supposed to reflect the initial open state of the device. If the device is initially opened R/O, then commit operations, or reopen operations changing to R/W, are prohibited. Currently, the keep_read_only flag is only accurate for the active layer, and its backing file. Subsequent images end up always having the keep_read_only flag set. For instance, what happens now: [ base ] kro = 1, ro = 1 | v [ snap-1 ] kro = 1, ro = 1 | v [ snap-2 ] kro = 0, ro = 1 | v [ active ] kro = 0, ro = 0 What we want: [ base ] kro = 0, ro = 1 | v [ snap-1 ] kro = 0, ro = 1 | v [ snap-2 ] kro = 0, ro = 1 | v [ active ] kro = 0, ro = 0 Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-12block: Don't forget to delete temporary fileDunrong Huang1-1/+5
The caller would not delete temporary file after failed get_tmp_filename(). Signed-off-by: Dunrong Huang <riegamaths@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-12block: fix block tray statusPavel Hrdina1-2/+2
The tray status should change also if you eject empty block device. Signed-off-by: Pavel Hrdina <phrdina@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-15block: Flush parent to OS with cache=unsafeKevin Wolf1-1/+2
Commit 29cdb251 already added a comment that no unnecessary flushes to disk will occur, this patch makes the code even get to the point of the comment. This is mostly theoretical because in practice we only stack one format on top of one protocol, the former implementing flush_to_os and the latter only flush_to_disk. It starts to matter when drivers that are not on top implement flush_to_os. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-08-13qmp: query-block: add 'encryption_key_missing' fieldLuiz Capitulino1-0/+1
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com>
2012-08-03block: Use bdrv_get_backing_file_depth()Benoît Canet1-0/+3
Use the dedicated counting function in qmp_query_block in order to propagate the backing file depth to HMP and add backing_file_depth to qmp-commands.hx Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-08-03block: create bdrv_get_backing_file_depth()Benoît Canet1-0/+13
Create bdrv_get_backing_file_depth() in order to be able to show in QMP and HMP how many ancestors backing an image a block device have. Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-07-28Avoid returning voidBlue Swirl1-1/+1
It's silly and non-conforming to standards to return void, don't do it. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-07-17block: Geometry and translation hints are now useless, purge themMarkus Armbruster1-32/+0
There are two producers of these hints: drive_init() on behalf of -drive, and hd_geometry_guess(). The only consumer of the hint is hd_geometry_guess(). The callers of hd_geometry_guess() call it only when drive_init() didn't set the hints. Therefore, drive_init()'s hints are never used. Thus, hd_geometry_guess() only ever sees hints it produced itself in a prior call. Only the first call computes something, subsequent calls just repeat the first call's results. However, hd_geometry_guess() is never called more than once: the device models don't, and the block device is destroyed on unplug. Thus, dropping the repeat feature doesn't break anything now. If a block device wasn't destroyed on unplug and could be reused with a new device, then repeating old results would be wrong. Thus, dropping the repeat feature prevents future breakage. This renders the hints unused. Purge them from the block layer. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17hd-geometry: Move disk geometry guessing back from block.cMarkus Armbruster1-121/+0
Commit f3d54fc4 factored it out of hw/ide.c for reuse. Sensible, except it was put into block.c. Device-specific functionality should be kept in device code, not the block layer. Move it to hw/hd-geometry.c, and make stylistic changes required to keep checkpatch.pl happy. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17fdc: Move floppy geometry guessing back from block.cMarkus Armbruster1-101/+0
Commit 5bbdbb46 moved it to block.c because "other geometry guessing functions already reside in block.c". Device-specific functionality should be kept in device code, not the block layer. Move it back. Disk geometry guessing is still in block.c. To be moved out in a later patch series. Bonus: the floppy type used in pc_cmos_init() now obviously matches the one in the FDrive. Before, we relied on bdrv_get_floppy_geometry_hint() picking the same type both in fd_revalidate() and in pc_cmos_init(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-09Merge remote-tracking branch 'mjt/mjt-iov2' into stagingAnthony Liguori1-6/+6
* mjt/mjt-iov2: rewrite iov_send_recv() and move it to iov.c cleanup qemu_co_sendv(), qemu_co_recvv() and friends export iov_send_recv() and use it in iov_send() and iov_recv() rename qemu_sendv to iov_send, change proto and move declarations to iov.h change qemu_iovec_to_buf() to match other to,from_buf functions consolidate qemu_iovec_copy() and qemu_iovec_concat() and make them consistent allow qemu_iovec_from_buffer() to specify offset from which to start copying consolidate qemu_iovec_memset{,_skip}() into single function and use existing iov_memset() rewrite iov_* functions change iov_* function prototypes to be more appropriate virtio-serial-bus: use correct lengths in control_out() message Conflicts: tests/Makefile Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-07-09block: Factor bdrv_read_unthrottled() out of guess_disk_lchs()Markus Armbruster1-7/+17
To prepare move of guess_disk_lchs() into hw/, where it poking BlockDriverState member io_limits_enabled directly would be unclean. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-09fdc: Drop broken code for user-defined floppy geometryMarkus Armbruster1-34/+28
bdrv_get_floppy_geometry_hint() fails to store through its parameter drive when bs has a geometry hint. Makes fd_revalidate() assign random crap to drv->drive. Has been broken that way for ages. Harmless, because: * The only way to set a geometry hint is -drive if=none,cyls=... Since commit c219331e, probably unintentional. * The only use of drv->drive is as argument to another bdrv_get_floppy_geometry_hint(). Which doesn't use it, since the geometry hint is still there. Drop the broken code, ignore -drive parameter cyls, heads and secs for floppies even with if=none, just like before commit c219331e. Matches -help, which explains cyls, heads, secs as "hard disk physical geometry". Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-09block: introduce bdrv_swap, implement bdrv_append on top of itPaolo Bonzini1-85/+99
The new function can be made a bit nicer than bdrv_append. It swaps the whole contents, and then swaps back (using the usual t=a;a=b;b=t idiom) the fields that need to stay on top. Thus, it does not need explicit bdrv_detach_dev, bdrv_iostatus_disable, etc. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-09block: copy over job and dirty bitmap fields in bdrv_appendPaolo Bonzini1-0/+15
While these should not be in use at the time a transaction is started, a command in the prepare phase of a transaction might have added them, so they need to be brought over. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: Replace bdrv_get_format() by bdrv_get_format_name()Markus Armbruster1-7/+4
So callers don't need to know anything about maximum name length. Returning a pointer is safe, because the name string lives as long as the block driver it names, and block drivers don't die. Requested by Peter Maydell. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: always open drivers in writeback modePaolo Bonzini1-1/+2
Formats are entirely in charge of flushes for metadata writes. For guest-initiated writes, a writethrough cache is faked in the block layer. So we can always open in writeback mode. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: add bdrv_set_enable_write_cachePaolo Bonzini1-0/+5
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: copy enable_write_cache in bdrv_appendPaolo Bonzini1-0/+2
Because the guest will be able to flip enable_write_cache, the actual state may not match what is used to open the new snapshot. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: flush in writethrough mode after writesPaolo Bonzini1-2/+9
We want to make the formats handle their own flushes autonomously, while keeping for guests the ability to use a writethrough cache. Since formats will write metadata via bs->file, bdrv_co_do_writev is the only place where we need to add a flush. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: New bdrv_get_flags()Markus Armbruster1-0/+5
Signed-off-by: Markus Armbruster <armbru@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15qemu-img check -r for repairing imagesKevin Wolf1-2/+2
The QED block driver already provides the functionality to not only detect inconsistencies in images, but also fix them. However, this functionality cannot be manually invoked with qemu-img, but the check happens only automatically during bdrv_open(). This adds a -r switch to qemu-img check that allows manual invocation of an image repair. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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