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2017-04-08dm kcopyd: switch to use REQ_OP_WRITE_ZEROESChristoph Hellwig1-3/+3
It seems like the code currently passes whatever it was using for writes to WRITE SAME. Just switch it to WRITE ZEROES, although that doesn't need any payload. Untested, and confused by the code, maybe someone who understands it better than me can help.. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08dm: support REQ_OP_WRITE_ZEROESChristoph Hellwig8-8/+77
Copy & paste from the REQ_OP_WRITE_SAME code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08dm io: discards don't take a payloadChristoph Hellwig1-2/+8
Fix up do_region to not allocate a bio_vec for discards. We've got rid of the discard payload allocated by the caller years ago. Obviously this wasn't actually harmful given how long it's been there, but it's still good to avoid the pointless allocation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08md: support REQ_OP_WRITE_ZEROESChristoph Hellwig7-1/+16
Copy & paste from the REQ_OP_WRITE_SAME code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08sd: implement REQ_OP_WRITE_ZEROESChristoph Hellwig2-5/+27
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08sd: split sd_setup_discard_cmndChristoph Hellwig1-69/+84
Split sd_setup_discard_cmnd into one function per provisioning type. While this creates some very slight duplication of boilerplate code it keeps the code modular for additions of new provisioning types, and for reusing the write same functions for the upcoming scsi implementation of the Write Zeroes operation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-07Merge branch 'for-linus' into for-4.12/blockJens Axboe263-1482/+4092
We've added a considerable amount of fixes for stalls and issues with the blk-mq scheduling in the 4.11 series since forking off the for-4.12/block branch. We need to do improvements on top of that for 4.12, so pull in the previous fixes to make our lives easier going forward. Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-07dm rq: Avoid that request processing stalls sporadicallyBart Van Assche1-0/+1
While running the srp-test software I noticed that request processing stalls sporadically at the beginning of a test, namely when mkfs is run against a dm-mpath device. Every time when that happened the following command was sufficient to resume request processing: echo run >/sys/kernel/debug/block/dm-0/state This patch avoids that such request processing stalls occur. The test I ran is as follows: while srp-test/run_tests -d -r 30 -t 02-mq; do :; done Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-07scsi: Avoid that SCSI queues get stuckBart Van Assche1-3/+3
If a .queue_rq() function returns BLK_MQ_RQ_QUEUE_BUSY then the block driver that implements that function is responsible for rerunning the hardware queue once requests can be queued again successfully. commit 52d7f1b5c2f3 ("blk-mq: Avoid that requeueing starts stopped queues") removed the blk_mq_stop_hw_queue() call from scsi_queue_rq() for the BLK_MQ_RQ_QUEUE_BUSY case. Hence change all calls to functions that are intended to rerun a busy queue such that these examine all hardware queues instead of only stopped queues. Since no other functions than scsi_internal_device_block() and scsi_internal_device_unblock() should ever stop or restart a SCSI queue, change the blk_mq_delay_queue() call into a blk_mq_delay_run_hw_queue() call. Fixes: commit 52d7f1b5c2f3 ("blk-mq: Avoid that requeueing starts stopped queues") Fixes: commit 7e79dadce222 ("blk-mq: stop hardware queue in blk_mq_delay_queue()") Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Long Li <longli@microsoft.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-07block: trace completion of all bios.NeilBrown2-3/+0
Currently only dm and md/raid5 bios trigger trace_block_bio_complete(). Now that we have bio_chain() and bio_inc_remaining(), it is not possible, in general, for a driver to know when the bio is really complete. Only bio_endio() knows that. So move the trace_block_bio_complete() call to bio_endio(). Now trace_block_bio_complete() pairs with trace_block_bio_queue(). Any bio for which a 'queue' event is traced, will subsequently generate a 'complete' event. There are a few cases where completion tracing is not wanted. 1/ If blk_update_request() has already generated a completion trace event at the 'request' level, there is no point generating one at the bio level too. In this case the bi_sector and bi_size will have changed, so the bio level event would be wrong 2/ If the bio hasn't actually been queued yet, but is being aborted early, then a trace event could be confusing. Some filesystems call bio_endio() but do not want tracing. 3/ The bio_integrity code interposes itself by replacing bi_end_io, then restoring it and calling bio_endio() again. This would produce two identical trace events if left like that. To handle these, we introduce a flag BIO_TRACE_COMPLETION and only produce the trace event when this is set. We address point 1 above by clearing the flag in blk_update_request(). We address point 2 above by only setting the flag when generic_make_request() is called. We address point 3 above by clearing the flag after generating a completion event. When bio_split() is used on a bio, particularly in blk_queue_split(), there is an extra complication. A new bio is split off the front, and may be handle directly without going through generic_make_request(). The old bio, which has been advanced, is passed to generic_make_request(), so it will trigger a trace event a second time. Probably the best result when a split happens is to see a single 'queue' event for the whole bio, then multiple 'complete' events - one for each component. To achieve this was can: - copy the BIO_TRACE_COMPLETION flag to the new bio in bio_split() - avoid generating a 'queue' event if BIO_TRACE_COMPLETION is already set. This way, the split-off bio won't create a queue event, the original won't either even if it re-submitted to generic_make_request(), but both will produce completion events, each for their own range. So if generic_make_request() is called (which generates a QUEUED event), then bi_endio() will create a single COMPLETE event for each range that the bio is split into, unless the driver has explicitly requested it not to. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05block, scsi: move the retries field to struct scsi_requestChristoph Hellwig7-8/+8
Instead of bloating the generic struct request with it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05nvme: move the retries count to struct nvme_requestChristoph Hellwig2-5/+6
The way NVMe uses this field is entirely different from the older SCSI/BLOCK_PC usage, so move it into struct nvme_request. Also reduce the size of the file to a unsigned char so that we leave space for additional smaller fields that will appear soon. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05nvme: mark nvme_max_retries staticChristoph Hellwig2-4/+1
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05nvme: cleanup nvme_req_needs_retryChristoph Hellwig1-5/+11
Don't pass the status explicitly but derive it from the requeust, and unwind the complex condition to be more readable. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05nvme: move ->retries setup to nvme_setup_cmdChristoph Hellwig2-4/+5
->retries is counting the number of times a command is resubmitted, and be cleared on the first time we see the command. We currently don't do that for non-PCIe command, which is easily fixed by moving the setup to common code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-05remove the obsolete hd driverChristoph Hellwig3-832/+0
This driver is for pre-IDE hardisk that are only found in PC from the stoneage of personal computing, and which we don't support elsewhere in the kernel these days. It's also been marked broken forever. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme: factor request completion code into a common helperChristoph Hellwig6-93/+40
This avoids duplicating the logic four times, and it also allows to keep some helpers static in core.c or just opencode them. Note that this loses printing the aborted status on completions in the PCI driver as that uses a data structure not available any more. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-fc: drop ctrl for all command completionsChristoph Hellwig1-2/+3
A requeue means we go through nvme_fc_start_fcp_op again and get another controller reference. To make sure the refcount doesn't leak we also need to drop it for every completion that came from the LLDD. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-fc: increment request retries counter before requeuingSagi Grimberg1-0/+1
This way our max retry limit holds as well. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: increment request retries counter before requeuingSagi Grimberg1-0/+1
This way our max retry limit holds as well. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: increment request retries counter before requeuingSagi Grimberg1-0/+1
This way our max retry limit holds as well. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme_fc: Clean up host fcpio done status handlingJames Smart1-7/+7
As Dan Carpenter pointed out: mixing 16-bit nvme status with 32-bit error status from driver. Corrected comment on fcp request struct status field, and converted done routine to explicitly set nvme status codes for nvme status. Signed-off-by: James Smart <james.smart@broadcom.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet_fc: Clear SG list to avoid double freesJames Smart1-0/+2
Clear SG list to avoid double frees of payload page list Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme_fc: correct LS validationJames Smart1-4/+5
LS validations shouldn't have been independent checks. Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet_fc: Sync NVME LS reject reasons with specJames Smart1-7/+12
nvmet_fc: Sync NVME LS reject reasons with spec Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme_fc: Add check of status_code in ERSP_IUJames Smart1-0/+1
Add check of status_code in ERSP_IU Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: Support ctrl_loss_tmoSagi Grimberg1-13/+28
Before scheduling a reconnect attempt, check nr_reconnects against max_reconnects, if not exhausted (or max_reconnects is not -1), schedule a reconnect attempts, otherwise schedule ctrl removal. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-fabrics: Allow ctrl loss timeout configurationSagi Grimberg2-0/+38
When a host sense that its controller session is damaged, it tries to re-establish it periodically (reconnect every reconnect_delay). It may very well be that the controller is gone and never coming back, in this case the host will try to reconnect forever. Add a ctrl_loss_tmo to bound the number of reconnect attempts to a specific controller (default to a reasonable 10 minutes). The timeout configuration is actually translated into number of reconnect attempts and not a schedule on its own but rather divided with reconnect_delay. This is useful to prevent racing flows of remove and reconnect, and it doesn't really matter if we remove slightly sooner than what the user requested. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: get rid of local reconnect_delaySagi Grimberg1-5/+3
we already have it in opts. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: retrieve iod from the cqe command_idSagi Grimberg1-6/+25
useful to validate that the we didn't mess up the command_id. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: remove unneeded includesSagi Grimberg1-2/+0
Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-fc: fix module_init (theoretical) error pathSagi Grimberg1-1/+10
If nvmf_register_transport happened to fail (it can't, but theoretically) we leak memory. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: fix module_init (theoretical) error pathSagi Grimberg1-1/+6
if nvmf_register_transport happend to fail, we need to nvmet_unregister_transport as well. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: fix module_init (theoretical) error pathSagi Grimberg1-5/+13
If nvmf_register_transport happened to fail (it can't, but theoretically) we leak memory. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet: use symbolic constants for log identifiersMax Gurtovoy1-6/+6
Signed-off-by: Max Gurtovoy <maxg@mellanox.com> Reviewed-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet: Introduced helper routine for controller status check.Parav Pandit6-34/+41
This patch introduces helper function for checking controller status during admin and io command processing which returns u16 status. As to bring consistency on returning status, other friend functions also now return u16 status instead of int to match the spec. As part of the theseerror log prints in also prints qid on which command error occured. Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet: Fixed avoided printing nvmet: twice in error logs.Parav Pandit4-21/+20
This patch avoids printing "nvmet:" twice in error logs as its already coming through pr_fmt macro. Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04iscsi-target: use generic inet_pton_with_scopeSagi Grimberg1-34/+12
Instead of parsing address strings, use a generic helper. Acked-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: use inet_pton_with_scope helperSagi Grimberg1-44/+19
Both the destination and the host addresses are now parsed using inet_pton_with_scope helper. We also get ipv6 (with address scopes support). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet-rdma: use generic inet_pton_with_scopeSagi Grimberg1-13/+29
Instead of parsing address strings, use a generic helper. This also adds ipv6 (with address scopes) support. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: remove some code duplicationSagi Grimberg1-12/+21
Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: Give some more grace for rdma connection establishmentSagi Grimberg1-1/+1
The target might be occupied with multiple hosts so lets give it some more grace before failing the connection establishment. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet-rdma: occasionally flush ongoing controller teardownSagi Grimberg1-0/+5
If we are attacked with establishments/teradowns we need to make sure we do not consume too much system memory. Thus let ongoing controller teardowns complete before accepting new controller establishments. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-rdma: handle cpu unplug when re-establishing the controllerSagi Grimberg1-14/+14
If a cpu unplug event has occured, we need to take the minimum of the provided nr_io_queues and the number of online cpus, otherwise we won't be able to connect them as blk-mq mapping won't dispatch to those queues. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet-rdma: Fix a possible uninitialized variable dereferenceSagi Grimberg1-5/+3
When handling a new recv command, we grab a new rsp resource and check for the queue state being live. In case the queue is not in live state, we simply restore the rsp back to the free list. However in this flow we didn't set rsp->queue yet, so we cannot dereference it. Instead, make sure to initialize rsp->queue (and other rsp members) as soon as possible so we won't reference uninitialized variables. Reported-by: Yi Zhang <yizhan@redhat.com> Reported-by: Raju Rangoju <rajur@chelsio.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Raju Rangoju <rajur@chelsio.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvmet: confirm sq percpu has scheduled and switched to atomicSagi Grimberg2-1/+11
percpu_ref_kill is not enough to prevent subsequent percpu_ref_tryget_live from failing. Hence call perfcpu_ref_kill_confirm to make it safe. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-04nvme-loop: handle cpu unplug when re-establishing the controllerSagi Grimberg1-38/+50
If a cpu unplug event has occured, we need to take the minimum of the provided nr_io_queues and the number of online cpus, otherwise we won't be able to connect them as blk-mq mapping won't dispatch to those queues. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
2017-04-04nvme-loop: fix a possible use-after-free when destroying the admin queueSagi Grimberg1-1/+1
we need to destroy the nvmet sq and let it finish gracefully before continue to cleanup the queue. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
2017-04-02nvmet: fix byte swap in nvmet_parse_io_cmdChristoph Hellwig1-1/+1
We need to do arithmetics after byte swapping, not before. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
2017-04-02nvmet: fix byte swap in nvmet_execute_write_zeroesChristoph Hellwig1-1/+1
The length field in the Write Zeroes command is a 16-bit field. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
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