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path: root/fs/nfs/pnfs.c
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2016-02-22NFSv4.x/pnfs: Fix a race between layoutget and bulk recallsTrond Myklebust
Replace another case where the layout 'plh_block_lgets' can trigger infinite loops in send_layoutget(). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-02-22NFSv4.x/pnfs: Fix a race between layoutget and pnfs_destroy_layoutTrond Myklebust
If the server reboots while there is a layoutget outstanding, then the call to pnfs_choose_layoutget_stateid() will fail with an EAGAIN error, which causes an infinite loop in send_layoutget(). The reason why we never break out of the loop is that the layout 'plh_block_lgets' field is never cleared. Fix is to replace plh_block_lgets with NFS_LAYOUT_INVALID_STID, which can be reset after a new layoutget. Fixes: ab7d763e477c5 ("pNFS: Ensure nfs4_layoutget_prepare returns...") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-02-15pNFS: Always set NFS_LAYOUT_RETURN_REQUESTED with lo->plh_return_iomodeTrond Myklebust
When setting the layout return mode, we must always also set the NFS_LAYOUT_RETURN_REQUESTED flag to ensure that we send a layoutreturn. Otherwise pnfs_error_mark_layout_for_return() could set the mode, but fail to send the layoutreturn because another is already in flight. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-02-15pNFS: Fix pnfs_mark_matching_lsegs_return()Trond Myklebust
We don't need to schedule a layoutreturn if the layout segment can be freed immediately. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-28NFS: Cleanup - rename NFS_LAYOUT_RETURN_BEFORE_CLOSETrond Myklebust
NFS_LAYOUT_RETURN_BEFORE_CLOSE is being used to signal that a layoutreturn is needed, either due to a layout recall or to a layout error. Rename it to NFS_LAYOUT_RETURN_REQUESTED in order to clarify its purpose. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-27pNFS: Fix missing layoutreturn callsTrond Myklebust
The layoutreturn code currently relies on pnfs_put_lseg() to initiate the RPC call when conditions are right. A problem arises when we want to free the layout segment from inside an inode->i_lock section (e.g. in pnfs_clear_request_commit()), since we cannot sleep. The workaround is to move the actual call to pnfs_send_layoutreturn() to pnfs_put_layout_hdr(), which doesn't have this restriction. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04Merge branch 'pnfs_generic'Trond Myklebust
* pnfs_generic: NFSv4.1/pNFS: Cleanup constify struct pnfs_layout_range arguments NFSv4.1/pnfs: Cleanup copying of pnfs_layout_range structures NFSv4.1/pNFS: Cleanup pnfs_mark_matching_lsegs_invalid() NFSv4.1/pNFS: Fix a race in initiate_file_draining() NFSv4.1/pNFS: pnfs_error_mark_layout_for_return() must always return layout NFSv4.1/pNFS: pnfs_mark_matching_lsegs_return() should set the iomode NFSv4.1/pNFS: Use nfs4_stateid_copy for copying stateids NFSv4.1/pNFS: Don't pass stateids by value to pnfs_send_layoutreturn() NFS: Relax requirements in nfs_flush_incompatible NFSv4.1/pNFS: Don't queue up a new commit if the layout segment is invalid NFS: Allow multiple commit requests in flight per file NFS/pNFS: Fix up pNFS write reschedule layering violations and bugs NFSv4: List stateid information in the callback tracepoints NFSv4.1/pNFS: Don't return NFS4ERR_DELAY unnecessarily in CB_LAYOUTRECALL NFSv4.1/pNFS: Ensure we enforce RFC5661 Section 12.5.5.2.1 pNFS: If we have to delay the layout callback, mark the layout for return NFSv4.1/pNFS: Add a helper to mark the layout as returned pNFS: Ensure nfs4_layoutget_prepare returns the correct error
2016-01-04NFSv4.1/pNFS: Cleanup constify struct pnfs_layout_range argumentsTrond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pnfs: Cleanup copying of pnfs_layout_range structuresTrond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pNFS: Cleanup pnfs_mark_matching_lsegs_invalid()Trond Myklebust
Make it more obvious what we're returning... Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pNFS: pnfs_error_mark_layout_for_return() must always return layoutTrond Myklebust
Fix a bug whereby if all the layout segments could be immediately freed, the call to pnfs_error_mark_layout_for_return() would never result in a layoutreturn. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pNFS: pnfs_mark_matching_lsegs_return() should set the iomodeTrond Myklebust
If pnfs_mark_matching_lsegs_return() needs to mark a layout segment for return, then it must also set the return iomode. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pNFS: Use nfs4_stateid_copy for copying stateidsTrond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-04NFSv4.1/pNFS: Don't pass stateids by value to pnfs_send_layoutreturn()Trond Myklebust
A stateid is a structure, pass it as a pointer. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-31NFSv4.1/pNFS: Don't queue up a new commit if the layout segment is invalidTrond Myklebust
If the layout segment is invalid, then we should not be adding more write requests to the commit list. Instead, those writes should be replayed after requesting a new layout. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28pNFS: If we have to delay the layout callback, mark the layout for returnTrond Myklebust
If the client needs to delay the layout callback, then speed up the recall process by marking the remaining layout segments to be actively returned by the client. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28NFSv4.1/pNFS: Add a helper to mark the layout as returnedTrond Myklebust
This ensures that we don't reuse the stateid if a layout return or implied layout return means that we've returned all layout segments Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28pNFS/flexfiles: Don't mark the entire layout as failed, when returning itTrond Myklebust
In pNFS/flexfiles, we want to return the layout without necessarily marking it as having completely failed. We therefore move the call to pnfs_layout_io_set_failed() out of pnfs_error_mark_layout_for_return(), and then ensura that pNFS/files layout calls it separately. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28pNFS/flexfiles: Don't prevent flexfiles client from retrying LAYOUTGETTrond Myklebust
Fix a bug in which flexfiles clients are falling back to I/O through the MDS even when the FF_FLAGS_NO_IO_THRU_MDS flag is set. The flexfiles client will always report errors through the LAYOUTRETURN and/or LAYOUTERROR mechanisms, so it should normally be safe for it to retry the LAYOUTGET until it fails or succeeds. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28nfs: handle request add failure properlyPeng Tao
When we fail to queue a read page to IO descriptor, we need to clean it up otherwise it is hanging around preventing nfs module from being removed. When we fail to queue a write page to IO descriptor, we need to clean it up and also save the failure status to open context. Then at file close, we can try to write pages back again and drop the page if it fails to writeback in .launder_page, which will be done in the next patch. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28nfs: centralize pgio error cleanupPeng Tao
In case we fail during setting things up for read/write IO, set pg_error in IO descriptor and do the cleanup in nfs_pageio_add_request, where we clean up all pages that are still hanging around on the IO descriptor. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28NFS41: pop some layoutget errors to applicationPeng Tao
For ERESTARTSYS/EIO/EROFS/ENOSPC/E2BIG in layoutget, we should just bail out instead of hiding the error and retrying inband IO. Change all the call sites to pop the error all the way up. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28pNFS: Modify pnfs_update_layout tracepoints to use layout stateidTrond Myklebust
Instead of displaying a layout segment pointer in these tracepoints, let's use the layout stateid, now that Olga gave us a set of tools for displaying them. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28nfs: add new tracepoint for pnfs_update_layoutJeff Layton
pnfs_update_layout is really the "nexus" of layout handling. If it returns NULL then we end up going through the MDS. This patch adds some tracepoints to that function that allow us to determine the cause when we end up going through the MDS unexpectedly. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-13sched/wait: Fix the signal handling fixPeter Zijlstra
Jan Stancek reported that I wrecked things for him by fixing things for Vladimir :/ His report was due to an UNINTERRUPTIBLE wait getting -EINTR, which should not be possible, however my previous patch made this possible by unconditionally checking signal_pending(). We cannot use current->state as was done previously, because the instruction after the store to that variable it can be changed. We must instead pass the initial state along and use that. Fixes: 68985633bccb ("sched/wait: Fix signal handling in bit wait helpers") Reported-by: Jan Stancek <jstancek@redhat.com> Reported-by: Chris Mason <clm@fb.com> Tested-by: Jan Stancek <jstancek@redhat.com> Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> Tested-by: Chris Mason <clm@fb.com> Reviewed-by: Paul Turner <pjt@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: tglx@linutronix.de Cc: Oleg Nesterov <oleg@redhat.com> Cc: hpa@zytor.com Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-11-25nfs4: resend LAYOUTGET when there is a race that changes the seqidJeff Layton
pnfs_layout_process will check the returned layout stateid against what the kernel has in-core. If it turns out that the stateid we received is older, then we should resend the LAYOUTGET instead of falling back to MDS I/O. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Cc: stable@vger.kernel.org # 3.18+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-21NFSv4.1/pnfs: Retry through MDS when getting bad length of dataKinglong Mee
If non rpc-based layout driver return bad length of data, nfs retries by calling rpc_restart_call_prepare() that cause an NULL reference panic. This patch lets nfs retry through MDS for non rpc-based layout driver return bad length of data. [13034.883329] BUG: unable to handle kernel NULL pointer dereference at (null) [13034.884902] IP: [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc] [13034.886558] PGD 0 [13034.888126] Oops: 0000 [#1] KASAN [13034.889710] Modules linked in: blocklayoutdriver(OE) nfsv4(OE) nfs(OE) fscache(E) nfsd(OE) xfs libcrc32c coretemp btrfs crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ppdev vmw_balloon auth_rpcgss shpchp nfs_acl lockd vmw_vmci parport_pc xor raid6_pq grace parport sunrpc i2c_piix4 vmwgfx drm_kms_helper ttm drm mptspi e1000 serio_raw scsi_transport_spi mptscsih mptbase ata_generic pata_acpi [last unloaded: fscache] [13034.898260] CPU: 0 PID: 10112 Comm: kworker/0:1 Tainted: G OE 4.3.0-rc5+ #279 [13034.899932] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015 [13034.903342] Workqueue: events bl_read_cleanup [blocklayoutdriver] [13034.905059] task: ffff88006a9148c0 ti: ffff880035e90000 task.ti: ffff880035e90000 [13034.906827] RIP: 0010:[<ffffffffa00db372>] [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc] [13034.910522] RSP: 0018:ffff880035e97b58 EFLAGS: 00010282 [13034.912378] RAX: fffffbfff04a5a94 RBX: ffff880068fe4858 RCX: 0000000000000003 [13034.914339] RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000282 [13034.916236] RBP: ffff880035e97b68 R08: 0000000000000001 R09: 0000000000000001 [13034.918229] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 [13034.920007] R13: ffff880068fe4858 R14: ffff880068fe4a60 R15: 0000000000001000 [13034.921845] FS: 0000000000000000(0000) GS:ffffffff82247000(0000) knlGS:0000000000000000 [13034.923645] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [13034.925525] CR2: 0000000000000000 CR3: 00000000063dd000 CR4: 00000000001406f0 [13034.932808] Stack: [13034.934813] ffff880068fe4780 0000000000001000 ffff880035e97ba8 ffffffffa08800d2 [13034.936675] ffffffffa088029d ffff880068fe4780 ffff880068fe4858 ffffffffa089c0a0 [13034.938593] ffff880068fe47e0 ffff88005d59faf0 ffff880035e97be0 ffffffffa087e08f [13034.940454] Call Trace: [13034.942388] [<ffffffffa08800d2>] nfs_readpage_result+0x112/0x200 [nfs] [13034.944317] [<ffffffffa088029d>] ? nfs_readpage_done+0xdd/0x160 [nfs] [13034.946267] [<ffffffffa087e08f>] nfs_pgio_result+0x9f/0x120 [nfs] [13034.948166] [<ffffffffa09266cc>] pnfs_ld_read_done+0x7c/0x1e0 [nfsv4] [13034.950247] [<ffffffffa03b07ee>] bl_read_cleanup+0x2e/0x60 [blocklayoutdriver] [13034.952156] [<ffffffff810ebf62>] process_one_work+0x412/0x870 [13034.954102] [<ffffffff810ebe84>] ? process_one_work+0x334/0x870 [13034.955949] [<ffffffff810ebb50>] ? queue_delayed_work_on+0x40/0x40 [13034.957985] [<ffffffff810ec441>] worker_thread+0x81/0x6a0 [13034.959817] [<ffffffff810ec3c0>] ? process_one_work+0x870/0x870 [13034.961785] [<ffffffff810f43bd>] kthread+0x17d/0x1a0 [13034.963544] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330 [13034.965479] [<ffffffff81100428>] ? finish_task_switch+0x88/0x220 [13034.967223] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330 [13034.968929] [<ffffffff81b6ae5f>] ret_from_fork+0x3f/0x70 [13034.970534] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330 [13034.972176] Code: c7 43 50 40 84 0d a0 e8 3d fe 1c e1 48 8d 7b 58 c7 83 e4 00 00 00 00 00 00 00 e8 ca fe 1c e1 4c 8b 63 58 4c 89 e7 e8 be fe 1c e1 <49> 83 3c 24 00 74 12 48 c7 43 50 f0 a2 0e a0 b8 01 00 00 00 5b [13034.977148] RIP [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc] [13034.978780] RSP <ffff880035e97b58> [13034.980399] CR2: 0000000000000000 Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-09-23NFS41: make close wait for layoutreturnPeng Tao
If we send a layoutreturn asynchronously before close, the close might reach server first and layoutreturn would fail with BADSTATEID because there is nothing keeping the layout stateid alive. Also do not pretend sending layoutreturn if we are not. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-31NFSv4.1/pNFS: Don't request a minimal read layout beyond the end of fileTrond Myklebust
If we have a read layout, then sanity check the minimal layout length so that it does not extend beyond the end of file. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-31NFSv4.1/pnfs: Don't ask for a read layout for an empty file.Trond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-27NFSv4.1/pNFS: pnfs_mark_matching_lsegs_return must notify of layout returnTrond Myklebust
It's not sufficient to just mark the layout segment for layout return. We also need to set the NFS_LAYOUT_RETURN_BEFORE_CLOSE flag in the layout header. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-25NFSv4.1/pnfs: Allow pNFS device drivers to customise layout segment insertionTrond Myklebust
This is needed in order to allow merging of contiguous layout segments, and also to correct the ordering of layouts for those device drivers that don't necessarily want to place the read-write layouts first. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-25NFSv4.1/pnfs: Add sanity check for the layout range returned by the serverTrond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-25NFSv4.2/pnfs: Make the layoutstats timer configurableTrond Myklebust
Allow advanced users to set the layoutstats timer in order to lengthen or shorten the period between layoutstat transmissions to the server. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-25NFS41: remove NFS_LAYOUT_ROC flagPeng Tao
If we return delegation before closing, we fail to do roc check during close because NFS_LAYOUT_ROC is cleared by delegreturn and it causes layouts to be still hanging around after delegreturn + close, which is a voilation against protocol. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-25NFSv4.1/pnfs: Add a tracepoint for return-on-close eventsTrond Myklebust
Allow tracing of return-on-close. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-20pNFS: Fix an unused variable warning in pnfs_roc_get_barrierTrond Myklebust
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-19NFS41: make sure sending LAYOUTRETURN before close if marked soPeng Tao
If layout is marked by NFS_LAYOUT_RETURN_BEFORE_CLOSE, we should always send LAYOUTRETURN before close, and we don't need to do ROC drain if we do send LAYOUTRETURN. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-19NFSv4.1/pnfs: Fix a close/delegreturn hang when return-on-close is setTrond Myklebust
The helper pnfs_roc() has already verified that we have no delegations, and no further open files, hence no outstanding I/O and it has marked all the return-on-close lsegs as being invalid. Furthermore, it sets the NFS_LAYOUT_RETURN bit, thus serialising the close/delegreturn with all future layoutget calls on this inode. The checks in pnfs_roc_drain() for valid layout segments are therefore redundant: those cannot exist until another layoutget completes. The other check for whether or not NFS_LAYOUT_RETURN is set, actually causes a hang, since we already know that we hold that flag. To fix, we therefore strip out all the functionality in pnfs_roc_drain() except the retrieval of the barrier state, and then rename the function accordingly. Reported-by: Christoph Hellwig <hch@infradead.org> Fixes: 5c4a79fb2b1c ("Don't prevent layoutgets when doing return-on-close") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Remove redundant wakeup in pnfs_send_layoutreturn()Trond Myklebust
pnfs_clear_layoutreturn_waitbit() should already be calling rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq) for us. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Remove redundant check in pnfs_layoutgets_blocked()Trond Myklebust
layoutget now should already be serialised w.r.t. layout returns Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Remove redundant lo->plh_block_lgets in layoutreturnTrond Myklebust
The NFS_LAYOUT_RETURN bit already suffices to ensure that layoutget is blocked. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Don't prevent layoutgets when doing return-on-closeTrond Myklebust
If there is an outstanding return-on-close, then we just want new layoutget requests to wait rather than fail. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Fix serialisation of layout return and layoutgetTrond Myklebust
We should always test for outstanding layout returns, whether or not pnfs_should_retry_layoutget() is true. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.1/pnfs: Remove redundant checks in pnfs_layoutgets_blocked()Trond Myklebust
If there are no valid layout segments, then we should already have checked in pnfs_update_layout() whether or not this is the first layoutget. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-08-12NFSv4.2/pnfs: Use GFP_NOIO for layoutstat reporting in the writeback pathTrond Myklebust
Prevent a potential deadlock. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-07-28nfs: plug memory leak when ->prepare_layoutcommit failsJeff Layton
"data" is currently leaked when the prepare_layoutcommit operation returns an error. Put the cred before taking the spinlock in that case, take the lock and then goto out_unlock which will drop the lock and then free "data". Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-07-11pNFS: Don't throw out valid layout segmentsTrond Myklebust
It is OK for layout segments to remain hashed even if no-one holds any references to them, provided that the segments are still valid. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-07-11pNFS: pnfs_roc_drain() fix a race with openTrond Myklebust
If a process reopens the file before we can send off the CLOSE/DELEGRETURN, then pnfs_roc_drain() may end up waiting for a new set of layout segments that are marked as return-on-close, but haven't yet been returned. Fix this by only waiting for those layout segments that were invalidated in pnfs_roc(). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-07-11pNFS: Fix races between return-on-close and layoutreturn.Trond Myklebust
If one or more of the layout segments reports an error during I/O, then we may have to send a layoutreturn to report the error back to the NFS metadata server. This patch ensures that the return-on-close code can detect the outstanding layoutreturn, and not preempt it. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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