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2017-02-24libceph: get rid of ack vs commitIlya Dryomov1-5/+1
- CEPH_OSD_FLAG_ACK shouldn't be set anymore, so assert on it - remove support for handling ack replies (OSDs will send ack replies only if clients request them) - drop the "do lingering callbacks under osd->lock" logic from handle_reply() -- lreq->lock is sufficient in all three cases Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-20rbd: kill obj_request->object_name and rbd_segment_name_cacheIlya Dryomov1-7/+0
Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20libceph: bump CEPH_PG_MAX_SIZE to 32Ilya Dryomov1-1/+1
... to accommodate potentially very wide EC pools. This increases the size of a typical rbd ceph_osd_request by ~12% (from 1040 to 1168 bytes), but I'd rather go future proof here. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-20crush: merge working data and scratchIlya Dryomov1-2/+1
Much like Arlo Guthrie, I decided that one big pile is better than two little piles. Reflects ceph.git commit 95c2df6c7e0b22d2ea9d91db500cf8b9441c73ba. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-02-20crush: remove mutable part of CRUSH mapIlya Dryomov1-0/+1
Then add it to the working state. It would be very nice if we didn't have to take a lock to calculate a crush placement. By moving the permutation array into the working data, we can treat the CRUSH map as immutable. Reflects ceph.git commit cbcd039651c0569551cb90d26ce27e1432671f2a. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-02-20libceph: use BUG() instead of BUG_ON(1)Arnd Bergmann1-1/+1
I ran into this compile warning, which is the result of BUG_ON(1) not always leading to the compiler treating the code path as unreachable: include/linux/ceph/osdmap.h: In function 'ceph_can_shift_osds': include/linux/ceph/osdmap.h:62:1: error: control reaches end of non-void function [-Werror=return-type] Using BUG() here avoids the warning. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-12-16Merge tag 'ceph-for-4.10-rc1' of git://github.com/ceph/ceph-clientLinus Torvalds5-5/+12
Pull ceph updates from Ilya Dryomov: "A varied set of changes: - a large rework of cephx auth code to cope with CONFIG_VMAP_STACK (myself). Also fixed a deadlock caused by a bogus allocation on the writeback path and authorize reply verification. - a fix for long stalls during fsync (Jeff Layton). The client now has a way to force the MDS log flush, leading to ~100x speedups in some synthetic tests. - a new [no]require_active_mds mount option (Zheng Yan). On mount, we will now check whether any of the MDSes are available and bail rather than block if none are. This check can be avoided by specifying the "no" option. - a couple of MDS cap handling fixes and a few assorted patches throughout" * tag 'ceph-for-4.10-rc1' of git://github.com/ceph/ceph-client: (32 commits) libceph: remove now unused finish_request() wrapper libceph: always signal completion when done ceph: avoid creating orphan object when checking pool permission ceph: properly set issue_seq for cap release ceph: add flags parameter to send_cap_msg ceph: update cap message struct version to 10 ceph: define new argument structure for send_cap_msg ceph: move xattr initialzation before the encoding past the ceph_mds_caps ceph: fix minor typo in unsafe_request_wait ceph: record truncate size/seq for snap data writeback ceph: check availability of mds cluster on mount ceph: fix splice read for no Fc capability case ceph: try getting buffer capability for readahead/fadvise ceph: fix scheduler warning due to nested blocking ceph: fix printing wrong return variable in ceph_direct_read_write() crush: include mapper.h in mapper.c rbd: silence bogus -Wmaybe-uninitialized warning libceph: no need to drop con->mutex for ->get_authorizer() libceph: drop len argument of *verify_authorizer_reply() libceph: verify authorize reply on connect ...
2016-12-15libceph: always signal completion when doneIlya Dryomov1-1/+1
r_safe_completion is currently, and has always been, signaled only if on-disk ack was requested. It's there for fsync and syncfs, which wait for in-flight writes to flush - all data write requests set ONDISK. However, the pool perm check code introduced in 4.2 sends a write request with only ACK set. An unfortunately timed syncfs can then hang forever: r_safe_completion won't be signaled because only an unsafe reply was requested. We could patch ceph_osdc_sync() to skip !ONDISK write requests, but that is somewhat incomplete and yet another special case. Instead, rename this completion to r_done_completion and always signal it when the OSD client is done with the request, whether unsafe, safe, or error. This is a bit cleaner and helps with the cancellation code. Reported-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-12-13Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-blockLinus Torvalds1-1/+1
Pull block layer updates from Jens Axboe: "This is the main block pull request this series. Contrary to previous release, I've kept the core and driver changes in the same branch. We always ended up having dependencies between the two for obvious reasons, so makes more sense to keep them together. That said, I'll probably try and keep more topical branches going forward, especially for cycles that end up being as busy as this one. The major parts of this pull request is: - Improved support for O_DIRECT on block devices, with a small private implementation instead of using the pig that is fs/direct-io.c. From Christoph. - Request completion tracking in a scalable fashion. This is utilized by two components in this pull, the new hybrid polling and the writeback queue throttling code. - Improved support for polling with O_DIRECT, adding a hybrid mode that combines pure polling with an initial sleep. From me. - Support for automatic throttling of writeback queues on the block side. This uses feedback from the device completion latencies to scale the queue on the block side up or down. From me. - Support from SMR drives in the block layer and for SD. From Hannes and Shaun. - Multi-connection support for nbd. From Josef. - Cleanup of request and bio flags, so we have a clear split between which are bio (or rq) private, and which ones are shared. From Christoph. - A set of patches from Bart, that improve how we handle queue stopping and starting in blk-mq. - Support for WRITE_ZEROES from Chaitanya. - Lightnvm updates from Javier/Matias. - Supoort for FC for the nvme-over-fabrics code. From James Smart. - A bunch of fixes from a whole slew of people, too many to name here" * 'for-4.10/block' of git://git.kernel.dk/linux-block: (182 commits) blk-stat: fix a few cases of missing batch flushing blk-flush: run the queue when inserting blk-mq flush elevator: make the rqhash helpers exported blk-mq: abstract out blk_mq_dispatch_rq_list() helper blk-mq: add blk_mq_start_stopped_hw_queue() block: improve handling of the magic discard payload blk-wbt: don't throttle discard or write zeroes nbd: use dev_err_ratelimited in io path nbd: reset the setup task for NBD_CLEAR_SOCK nvme-fabrics: Add FC LLDD loopback driver to test FC-NVME nvme-fabrics: Add target support for FC transport nvme-fabrics: Add host support for FC transport nvme-fabrics: Add FC transport LLDD api definitions nvme-fabrics: Add FC transport FC-NVME definitions nvme-fabrics: Add FC transport error codes to nvme.h Add type 0x28 NVME type code to scsi fc headers nvme-fabrics: patch target code in prep for FC transport support nvme-fabrics: set sqe.command_id in core not transports parser: add u64 number parser nvme-rdma: align to generic ib_event logging helper ...
2016-12-13ceph: add flags parameter to send_cap_msgJeff Layton1-0/+3
Add a flags parameter to send_cap_msg, so we can request expedited service from the MDS when we know we'll be waiting on the result. Set that flag in the case of try_flush_caps. The callers of that function generally wait synchronously on the result, so it's beneficial to ask the server to expedite it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Yan, Zheng <zyan@redhat.com>
2016-12-13ceph: check availability of mds cluster on mountYan, Zheng1-0/+5
Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-12-13libceph: drop len argument of *verify_authorizer_reply()Ilya Dryomov2-4/+3
The length of the reply is protocol-dependent - for cephx it's ceph_x_authorize_reply. Nothing sensible can be passed from the messenger layer anyway. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
2016-11-10libceph: initialize last_linger_id with a large integerIlya Dryomov1-0/+2
osdc->last_linger_id is a counter for lreq->linger_id, which is used for watch cookies. Starting with a large integer should ease the task of telling apart kernel and userspace clients. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-11-01ceph: don't include blk_types.h in messenger.hChristoph Hellwig1-1/+1
The file only needs the struct bvec_iter delcaration, which is available from bvec.h. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-03ceph: handle CEPH_SESSION_REJECT messageYan, Zheng1-0/+1
Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-08-25rbd: add 'client_addr' sysfs rbd device attributeIlya Dryomov1-0/+1
Export client addr/nonce, so userspace can check if a image is being blacklisted. Signed-off-by: Mike Christie <mchristi@redhat.com> [idryomov@gmail.com: ceph_client_addr(), endianess fix] Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-25libceph: rename ceph_client_id() -> ceph_client_gid()Ilya Dryomov1-1/+1
It's gid / global_id in other places. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: support for blacklisting clientsDouglas Fuller2-0/+14
Reuse ceph_mon_generic_request infrastructure for sending monitor commands. In particular, add support for 'blacklist add' to prevent other, non-responsive clients from making further updates. Signed-off-by: Douglas Fuller <dfuller@redhat.com> [idryomov@gmail.com: refactor, misc fixes throughout] Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: support for lock.lock_infoDouglas Fuller1-0/+22
Add an interface for the Ceph OSD lock.lock_info method and associated data structures. Based heavily on code by Mike Christie <michaelc@cs.wisc.edu>. Signed-off-by: Douglas Fuller <dfuller@redhat.com> [idryomov@gmail.com: refactor, misc fixes throughout] Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: support for advisory locking on RADOS objectsDouglas Fuller1-0/+27
This patch adds support for rados lock, unlock and break lock. Based heavily on code by Mike Christie <michaelc@cs.wisc.edu>. Signed-off-by: Douglas Fuller <dfuller@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: add ceph_osdc_call() single-page helperDouglas Fuller1-0/+8
Add a convenience function to osd_client to send Ceph OSD 'class' ops. The interface assumes that the request and reply data each consist of single pages. Signed-off-by: Douglas Fuller <dfuller@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: support for CEPH_OSD_OP_LIST_WATCHERSDouglas Fuller1-1/+14
Add support for this Ceph OSD op, needed to support the RBD exclusive lock feature. Signed-off-by: Douglas Fuller <dfuller@redhat.com> [idryomov@gmail.com: refactor, misc fixes throughout] Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-25libceph: rename ceph_entity_name_encode() -> ceph_auth_entity_name_encode()Ilya Dryomov1-1/+1
Clear up EntityName vs entity_name_t confusion. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-07-28ceph: fix symbol versioning for ceph_monc_do_statfsArnd Bergmann1-1/+2
The genksyms helper in the kernel cannot parse a type definition like "typeof(((type *)0)->keyfld)" that is used in the DEFINE_RB_FUNCS helper, causing the following EXPORT_SYMBOL() statement to be ignored when computing the crcs, and triggering a warning about this: WARNING: "ceph_monc_do_statfs" [fs/ceph/ceph.ko] has no CRC To work around the problem, we can rewrite the type to reference an undefined 'extern' symbol instead of a NULL pointer. This is evidently ok for genksyms, and it no longer complains about the line when calling it with 'genksyms -w'. I've looked briefly into extending genksyms instead, but it seems really hard to do. Jan Beulich introduced basic support for 'typeof' a while ago in dc53324060f3 ("genksyms: fix typeof() handling"), but that is not sufficient for the expression we have here. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: fcd00b68bbe2 ("libceph: DEFINE_RB_FUNCS macro") Cc: Jan Beulich <jbeulich@suse.com> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: fsmap.user subscription supportYan, Zheng2-3/+5
Signed-off-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28ceph: reduce i_nr_by_mode array sizeYan, Zheng1-1/+1
Track usage count for individual fmode bit. This can reduce the array size by half. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-07-28libceph: rados pool namespace supportYan, Zheng2-5/+7
Add pool namesapce pointer to struct ceph_file_layout and struct ceph_object_locator. Pool namespace is used by when mapping object to PG, it's also used when composing OSD request. The namespace pointer in struct ceph_file_layout is RCU protected. So libceph can read namespace without taking lock. Signed-off-by: Yan, Zheng <zyan@redhat.com> [idryomov@gmail.com: ceph_oloc_destroy(), misc minor changes] Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: introduce reference counted stringYan, Zheng2-0/+63
The data structure is for storing namesapce string. It allows namespace string to be shared between cephfs inodes with same layout. This data structure can also be referenced by OSD request. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-07-28libceph: define new ceph_file_layout structureYan, Zheng1-29/+21
Define new ceph_file_layout structure and rename old ceph_file_layout to ceph_file_layout_legacy. This is preparation for adding namespace to ceph_file_layout structure. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-07-28libceph: add start en/decoding block helpersIlya Dryomov1-0/+54
Add ceph_start_encoding() and ceph_start_decoding(), the equivalent of ENCODE_START and DECODE_START in the userspace ceph code. This is based on a patch from Mike Christie <michaelc@cs.wisc.edu>. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: add an ONSTACK initializer for oidsIlya Dryomov1-0/+5
An on-stack oid in ceph_ioctl_get_dataloc() is not initialized, resulting in a WARN and a NULL pointer dereference later on. We will have more of these on-stack in the future, so fix it with a convenience macro. Fixes: d30291b985d1 ("libceph: variable-sized ceph_object_id") Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: fix some missing includesIlya Dryomov3-1/+2
- decode.h needs slab.h for kmalloc() - osd_client.h needs msgpool.h for struct ceph_msgpool - msgpool.h doesn't need messenger.h Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-31libceph: change ceph_osdmap_flag() to take osdcIlya Dryomov2-5/+5
For the benefit of every single caller, take osdc instead of map. Also, now that osdc->osdmap can't ever be NULL, drop the check. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26ceph: make logical calculation functions return boolZhang Zhuoyu3-6/+6
This patch makes serverl logical caculation functions return bool to improve readability due to these particular functions only using 0/1 as their return value. No functional change. Signed-off-by: Zhang Zhuoyu <zhangzhuoyu@cmss.chinamobile.com>
2016-05-26ceph: using hash value to compose dentry offsetYan, Zheng1-0/+1
If MDS sorts dentries in dirfrag in hash order, we use hash value to compose dentry offset. dentry offset is: (0xff << 52) | ((24 bits hash) << 28) | (the nth entry hash hash collision) This offset is stable across directory fragmentation. This alos means there is no need to reset readdir offset if directory get fragmented in the middle of readdir. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-05-26ceph: define 'end/complete' in readdir reply as bit flagsYan, Zheng1-0/+12
Set a flag in readdir request, which indicates that client interprets 'end/complete' as bit flags. So that mds can reply additional flags in readdir reply. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-05-26libceph: support for subscribing to "mdsmap.<id>" mapsIlya Dryomov2-0/+3
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: replace ceph_monc_request_next_osdmap()Ilya Dryomov2-1/+1
... with a wrapper around maybe_request_map() - no need for two osdmap-specific functions. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: pool deletion detectionIlya Dryomov1-0/+6
This adds the "map check" infrastructure for sending osdmap version checks on CALC_TARGET_POOL_DNE and completing in-flight requests with -ENOENT if the target pool doesn't exist or has just been deleted. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: async MON client generic requestsIlya Dryomov1-3/+16
For map check, we are going to need to send CEPH_MSG_MON_GET_VERSION messages asynchronously and get a callback on completion. Refactor MON client to allow firing off generic requests asynchronously and add an async variant of ceph_monc_get_version(). ceph_monc_do_statfs() is switched over and remains sync. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: support for checking on status of watchIlya Dryomov1-0/+4
Implement ceph_osdc_watch_check() to be able to check on status of watch. Note that the time it takes for a watch/notify event to get delivered through the notify_wq is taken into account. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: support for sending notifiesIlya Dryomov2-0/+23
Implement ceph_osdc_notify() for sending notifies. Due to the fact that the current messenger can't do read-in into pagelists (it can only do write-out from them), I had to go with a page vector for a NOTIFY_COMPLETE payload, for now. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph, rbd: ceph_osd_linger_request, watch/notify v2Ilya Dryomov3-44/+75
This adds support and switches rbd to a new, more reliable version of watch/notify protocol. As with the OSD client update, this is mostly about getting the right structures linked into the right places so that reconnects are properly sent when needed. watch/notify v2 also requires sending regular pings to the OSDs - send_linger_ping(). A major change from the old watch/notify implementation is the introduction of ceph_osd_linger_request - linger requests no longer piggy back on ceph_osd_request. ceph_osd_event has been merged into ceph_osd_linger_request. All the details are now hidden within libceph, the interface consists of a simple pair of watch/unwatch functions and ceph_osdc_notify_ack(). ceph_osdc_watch() does return ceph_osd_linger_request, but only to keep the lifetime management simple. ceph_osdc_notify_ack() accepts an optional data payload, which is relayed back to the notifier. Portions of this patch are loosely based on work by Douglas Fuller <dfuller@redhat.com> and Mike Christie <michaelc@cs.wisc.edu>. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: a major OSD client updateIlya Dryomov1-11/+7
This is a major sync up, up to ~Jewel. The highlights are: - per-session request trees (vs a global per-client tree) - per-session locking (vs a global per-client rwlock) - homeless OSD session - no ad-hoc global per-client lists - support for pool quotas - foundation for watch/notify v2 support - foundation for map check (pool deletion detection) support The switchover is incomplete: lingering requests can be setup and teared down but aren't ever reestablished. This functionality is restored with the introduction of the new lingering infrastructure (ceph_osd_linger_request, linger_work, etc) in a later commit. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: protect osdc->osd_lru list with a spinlockIlya Dryomov1-0/+1
OSD client is getting moved from the big per-client lock to a set of per-session locks. The big rwlock would only be held for read most of the time, so a global osdc->osd_lru needs additional protection. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: handle_one_map()Ilya Dryomov2-0/+3
Separate osdmap handling from decoding and iterating over a bag of maps in a fresh MOSDMap message. This sets up the scene for the updated OSD client. Of particular importance here is the addition of pi->was_full, which can be used to answer "did this pool go full -> not-full in this map?". This is the key bit for supporting pool quotas. We won't be able to downgrade map_sem for much longer, so drop downgrade_write(). Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: allocate dummy osdmap in ceph_osdc_init()Ilya Dryomov1-0/+1
This leads to a simpler osdmap handling code, particularly when dealing with pi->was_full, which is introduced in a later commit. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: redo callbacks and factor out MOSDOpReply decodingIlya Dryomov1-2/+3
If you specify ACK | ONDISK and set ->r_unsafe_callback, both ->r_callback and ->r_unsafe_callback(true) are called on ack. This is very confusing. Redo this so that only one of them is called: ->r_unsafe_callback(true), on ack ->r_unsafe_callback(false), on commit or ->r_callback, on ack|commit Decode everything in decode_MOSDOpReply() to reduce clutter. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: drop msg argument from ceph_osdc_callback_tIlya Dryomov1-2/+1
finish_read(), its only user, uses it to get to hdr.data_len, which is what ->r_result is set to on success. This gains us the ability to safely call callbacks from contexts other than reply, e.g. map check. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: switch to calc_target(), part 2Ilya Dryomov2-18/+18
The crux of this is getting rid of ceph_osdc_build_request(), so that MOSDOp can be encoded not before but after calc_target() calculates the actual target. Encoding now happens within ceph_osdc_start_request(). Also nuked is the accompanying bunch of pointers into the encoded buffer that was used to update fields on each send - instead, the entire front is re-encoded. If we want to support target->name_len != base->name_len in the future, there is no other way, because oid is surrounded by other fields in the encoded buffer. Encoding OSD ops and adding data items to the request message were mixed together in osd_req_encode_op(). While we want to re-encode OSD ops, we don't want to add duplicate data items to the message when resending, so all call to ceph_osdc_msg_data_add() are factored out into a new setup_request_data(). Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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