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2020-04-01NFS: Try to join page groups before an O_DIRECT retransmissionTrond Myklebust2-1/+21
If we have to retransmit requests, try to join their page groups first. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Refactor nfs_lock_and_join_requests()Trond Myklebust2-68/+122
Refactor nfs_lock_and_join_requests() in order to separate out the subrequest merging into its own function nfs_lock_and_join_group() that can be used by O_DIRECT. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Reverse the submission order of requests in __nfs_pageio_add_request()Trond Myklebust1-69/+64
If we have to split the request up into subrequests, we have to submit the request pointed to by the function call parameter last, in case there is an error or other issue that causes us to exit before the last request is submitted. The reason is that the caller is expected to perform cleanup in those cases. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Clean up nfs_lock_and_join_requests()Trond Myklebust2-71/+94
Clean up nfs_lock_and_join_requests() to simplify the calculation of the range covered by the page group, taking into account the presence of mirrors. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Remove the redundant function nfs_pgio_has_mirroring()Trond Myklebust2-11/+2
We need to trust that desc->pg_mirror_idx is set correctly, whether or not mirroring is enabled. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Fix memory leaks in nfs_pageio_stop_mirroring()Trond Myklebust1-9/+8
If we just set the mirror count to 1 without first clearing out the mirrors, we can leak queued up requests. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Fix a request reference leak in nfs_direct_write_clear_reqs()Trond Myklebust1-0/+1
nfs_direct_write_scan_commit_list() will lock the request and bump the reference count, but we also need to account for the reference that was taken when we initially added the request to the commit list. Fixes: fb5f7f20cdb9 ("NFS: commit errors should be fatal") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Fix use-after-free issues in nfs_pageio_add_request()Trond Myklebust1-24/+24
We need to ensure that we create the mirror requests before calling nfs_pageio_add_request_mirror() on the request we are adding. Otherwise, we can end up with a use-after-free if the call to nfs_pageio_add_request_mirror() triggers I/O. Fixes: c917cfaf9bbe ("NFS: Fix up NFS I/O subrequest creation") Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Fix races nfs_page_group_destroy() vs nfs_destroy_unlinked_subrequests()Trond Myklebust2-24/+53
When a subrequest is being detached from the subgroup, we want to ensure that it is not holding the group lock, or in the process of waiting for the group lock. Fixes: 5b2b5187fa85 ("NFS: Fix nfs_page_group_destroy() and nfs_lock_and_join_requests() race cases") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01NFS: Fix a page leak in nfs_destroy_unlinked_subrequests()Trond Myklebust1-0/+1
When we detach a subrequest from the list, we must also release the reference it holds to the parent. Fixes: 5b2b5187fa85 ("NFS: Fix nfs_page_group_destroy() and nfs_lock_and_join_requests() race cases") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-01Merge tag 'selinux-pr-20200330' of ↵Linus Torvalds3-38/+38
git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux Pull SELinux updates from Paul Moore: "We've got twenty SELinux patches for the v5.7 merge window, the highlights are below: - Deprecate setting /sys/fs/selinux/checkreqprot to 1. This flag was originally created to deal with legacy userspace and the READ_IMPLIES_EXEC personality flag. We changed the default from 1 to 0 back in Linux v4.4 and now we are taking the next step of deprecating it, at some point in the future we will take the final step of rejecting 1. - Allow kernfs symlinks to inherit the SELinux label of the parent directory. In order to preserve backwards compatibility this is protected by the genfs_seclabel_symlinks SELinux policy capability. - Optimize how we store filename transitions in the kernel, resulting in some significant improvements to policy load times. - Do a better job calculating our internal hash table sizes which resulted in additional policy load improvements and likely general SELinux performance improvements as well. - Remove the unused initial SIDs (labels) and improve how we handle initial SIDs. - Enable per-file labeling for the bpf filesystem. - Ensure that we properly label NFS v4.2 filesystems to avoid a temporary unlabeled condition. - Add some missing XFS quota command types to the SELinux quota access controls. - Fix a problem where we were not updating the seq_file position index correctly in selinuxfs. - We consolidate some duplicated code into helper functions. - A number of list to array conversions. - Update Stephen Smalley's email address in MAINTAINERS" * tag 'selinux-pr-20200330' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux: selinux: clean up indentation issue with assignment statement NFS: Ensure security label is set for root inode MAINTAINERS: Update my email address selinux: avtab_init() and cond_policydb_init() return void selinux: clean up error path in policydb_init() selinux: remove unused initial SIDs and improve handling selinux: reduce the use of hard-coded hash sizes selinux: Add xfs quota command types selinux: optimize storage of filename transitions selinux: factor out loop body from filename_trans_read() security: selinux: allow per-file labeling for bpffs selinux: generalize evaluate_cond_node() selinux: convert cond_expr to array selinux: convert cond_av_list to array selinux: convert cond_list to array selinux: sel_avc_get_stat_idx should increase position index selinux: allow kernfs symlinks to inherit parent directory context selinux: simplify evaluate_cond_node() Documentation,selinux: deprecate setting checkreqprot to 1 selinux: move status variables out of selinux_ss
2020-03-31NFS: Ensure security label is set for root inodeScott Mayhew3-38/+38
When using NFSv4.2, the security label for the root inode should be set via a call to nfs_setsecurity() during the mount process, otherwise the inode will appear as unlabeled for up to acdirmin seconds. Currently the label for the root inode is allocated, retrieved, and freed entirely witin nfs4_proc_get_root(). Add a field for the label to the nfs_fattr struct, and allocate & free the label in nfs_get_root(), where we also add a call to nfs_setsecurity(). Note that for the call to nfs_setsecurity() to succeed, it's necessary to also move the logic calling security_sb_{set,clone}_security() from nfs_get_tree_common() down into nfs_get_root()... otherwise the SBLABEL_MNT flag will not be set in the super_block's security flags and nfs_setsecurity() will silently fail. Reported-by: Richard Haines <richard_c_haines@btinternet.com> Signed-off-by: Scott Mayhew <smayhew@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Tested-by: Stephen Smalley <sds@tycho.nsa.gov> [PM: fixed 80-char line width problems] Signed-off-by: Paul Moore <paul@paul-moore.com>
2020-03-31Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull RCU updates from Ingo Molnar: "The main changes in this cycle were: - Make kfree_rcu() use kfree_bulk() for added performance - RCU updates - Callback-overload handling updates - Tasks-RCU KCSAN and sparse updates - Locking torture test and RCU torture test updates - Documentation updates - Miscellaneous fixes" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (74 commits) rcu: Make rcu_barrier() account for offline no-CBs CPUs rcu: Mark rcu_state.gp_seq to detect concurrent writes Documentation/memory-barriers: Fix typos doc: Add rcutorture scripting to torture.txt doc/RCU/rcu: Use https instead of http if possible doc/RCU/rcu: Use absolute paths for non-rst files doc/RCU/rcu: Use ':ref:' for links to other docs doc/RCU/listRCU: Update example function name doc/RCU/listRCU: Fix typos in a example code snippets doc/RCU/Design: Remove remaining HTML tags in ReST files doc: Add some more RCU list patterns in the kernel rcutorture: Set KCSAN Kconfig options to detect more data races rcutorture: Manually clean up after rcu_barrier() failure rcutorture: Make rcu_torture_barrier_cbs() post from corresponding CPU rcuperf: Measure memory footprint during kfree_rcu() test rcutorture: Annotation lockless accesses to rcu_torture_current rcutorture: Add READ_ONCE() to rcu_torture_count and rcu_torture_batch rcutorture: Fix stray access to rcu_fwd_cb_nodelay rcutorture: Fix rcu_torture_one_read()/rcu_torture_writer() data race rcutorture: Make kvm-find-errors.sh abort on bad directory ...
2020-03-30Merge tag 'docs-5.7' of git://git.lwn.net/linuxLinus Torvalds1-1/+1
Pull documentation updates from Jonathan Corbet: "This has been a busy cycle for documentation work. Highlights include: - Lots of RST conversion work by Mauro, Daniel ALmeida, and others. Maybe someday we'll get to the end of this stuff...maybe... - Some organizational work to bring some order to the core-api manual. - Various new docs and additions to the existing documentation. - Typo fixes, warning fixes, ..." * tag 'docs-5.7' of git://git.lwn.net/linux: (123 commits) Documentation: x86: exception-tables: document CONFIG_BUILDTIME_TABLE_SORT MAINTAINERS: adjust to filesystem doc ReST conversion docs: deprecated.rst: Add BUG()-family doc: zh_CN: add translation for virtiofs doc: zh_CN: index files in filesystems subdirectory docs: locking: Drop :c:func: throughout docs: locking: Add 'need' to hardirq section docs: conf.py: avoid thousands of duplicate label warning on Sphinx docs: prevent warnings due to autosectionlabel docs: fix reference to core-api/namespaces.rst docs: fix pointers to io-mapping.rst and io_ordering.rst files Documentation: Better document the softlockup_panic sysctl docs: hw-vuln: tsx_async_abort.rst: get rid of an unused ref docs: perf: imx-ddr.rst: get rid of a warning docs: filesystems: fuse.rst: supress a Sphinx warning docs: translations: it: avoid duplicate refs at programming-language.rst docs: driver.rst: supress two ReSt warnings docs: trace: events.rst: convert some new stuff to ReST format Documentation: Add io_ordering.rst to driver-api manual Documentation: Add io-mapping.rst to driver-api manual ...
2020-03-28NFS: Remove unused FLUSH_SYNC support in nfs_initiate_pgio()Trond Myklebust1-12/+3
If the FLUSH_SYNC flag is set, nfs_initiate_pgio() will currently wait for completion, and then return the status of the I/O operation. What we actually want to report in nfs_pageio_doio() is whether or not the RPC call was launched successfully, whereas actual I/O status is intended handled in the reply callbacks. Since FLUSH_SYNC is never set by any of the callers anyway, let's just remove that code altogether. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS/flexfiles: Specify the layout segment range in LAYOUTGETTrond Myklebust1-4/+4
Move from requesting only full file layout segments, to requesting layout segments that match our I/O size. This means the server is still free to return a full file layout, but we will no longer error out if it does not. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS/flexfiles: remove requirement for whole file layoutsTrond Myklebust1-21/+0
Remove the requirement that the server always sends whole file layouts. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS/flexfiles: Check the layout segment range before doing I/OTrond Myklebust3-3/+13
When starting to read or write with a layout segment, check that the range matches our request. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS/flexfile: Don't merge layout segments if the mirrors don't matchTrond Myklebust1-0/+19
Check that the number of mirrors, and the mirror information matches before deciding to merge layout segments in pNFS/flexfiles. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Fix pnfs_layout_mark_request_commit() invalid layout segment handlingTrond Myklebust1-16/+12
Fix up pnfs_layout_mark_request_commit() to alway reschedule the write if the layout segment is invalid. Also minor cleanup. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Simplify bucket layout segment reference countingTrond Myklebust1-19/+20
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Clean up pNFS commit operationsTrond Myklebust5-71/+97
Move the pNFS commit related operations into a separate structure that can be carried by the pnfs_ds_commit_info. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS: Remove bucket array from struct pnfs_ds_commit_infoTrond Myklebust5-172/+1
Remove the unused bucket array in struct pnfs_ds_commit_info. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Add a helper pnfs_generic_search_commit_reqs()Trond Myklebust3-31/+54
Lift filelayout_search_commit_reqs() into the generic pnfs/nfs code, and add support for commit arrays. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS: Enable per-layout segment commit structuresTrond Myklebust4-6/+117
Enable adding and lookup of per-layout segment commits in filelayout and flexfilelayout. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS: Add infrastructure for cleaning up per-layout commit structuresTrond Myklebust6-4/+120
Ensure that both the file and flexfiles layout types clean up when freeing the layout segments. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Support commit arrays in nfs_clear_pnfs_ds_commit_verifiers()Trond Myklebust1-3/+16
Add support for scanning the full list of per-layout segment commit arrays to nfs_clear_pnfs_ds_commit_verifiers(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS: Fix O_DIRECT commit verifier handlingTrond Myklebust3-124/+22
Instead of trying to save the commit verifiers and checking them against previous writes, adopt the same strategy as for buffered writes, of just checking the verifiers at commit time. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS: commit errors should be fatalTrond Myklebust1-2/+30
Fix the O_DIRECT code to avoid retries if the COMMIT fails with a fatal error. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFS/pNFS: Allow O_DIRECT to release the DS commitinfoTrond Myklebust2-0/+17
Add a pNFS callback to allow the O_DIRECT code to release the DS commitinfo when freeing the dreq. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS: Support per-layout segment commits in pnfs_generic_commit_pagelist()Trond Myklebust1-0/+16
Add support for scanning the full list of per-layout segment commit arrays to pnfs_generic_commit_pagelist(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27pNFS: Support per-layout segment commits in pnfs_generic_recover_commit_reqs()Trond Myklebust1-8/+33
Add support for scanning the full list of per-layout segment commit arrays to pnfs_generic_recover_commit_reqs(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFSv4/pNFS: Scan the full list of commit arrays when committingTrond Myklebust1-12/+40
Add support for scanning the full list of per-layout segment commit arrays to pnfs_generic_scan_commit_lists() Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-27NFSv4/pnfs: Support a list of commit arrays in struct pnfs_ds_commit_infoTrond Myklebust4-1/+17
When we have multiple layout segments with different lists of mirrored data, we need to track the commits on a per layout segment basis. This patch adds a list to support this tracking in struct pnfs_ds_commit_info. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-26pNFS: Add a helper to allocate the array of bucketsTrond Myklebust2-0/+34
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-26NFS/pNFS: Refactor pnfs_generic_commit_pagelist()Trond Myklebust2-101/+76
Refactor pnfs_generic_commit_pagelist() to simplify the conversion to layout segment based commit lists. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-26pNFS/flexfiles: Simplify allocation of the mirror arrayTrond Myklebust2-17/+6
Just allocate the array at the end of the layout segment structure, instead of allocating it as a separate array of pointers. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-25NFS: Don't specify NFS version in "UDP not supported" errorPetr Vorel1-2/+2
UDP was originally disabled in 6da1a034362f for NFSv4. Later in b24ee6c64ca7 UDP is by default disabled by NFS_DISABLE_UDP_SUPPORT=y for all NFS versions. Therefore remove v4 from error message. Fixes: b24ee6c64ca7 ("NFS: allow deprecation of NFS UDP protocol") Signed-off-by: Petr Vorel <pvorel@suse.cz> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-25nfsroot: set tcp as the default transport protocolLiwei Song1-1/+1
UDP is disabled by default in commit b24ee6c64ca7 ("NFS: allow deprecation of NFS UDP protocol"), but the default mount options is still udp, change it to tcp to avoid the "Unsupported transport protocol udp" error if no protocol is specified when mount nfs. Fixes: b24ee6c64ca7 ("NFS: allow deprecation of NFS UDP protocol") Signed-off-by: Liwei Song <liwei.song@windriver.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-24Merge branch 'for-mingo' of ↵Ingo Molnar1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu Pull RCU changes from Paul E. McKenney: - Make kfree_rcu() use kfree_bulk() for added performance - RCU updates - Callback-overload handling updates - Tasks-RCU KCSAN and sparse updates - Locking torture test and RCU torture test updates - Documentation updates - Miscellaneous fixes Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-03-22NFS: direct.c: Fix memory leak of dreq when nfs_get_lock_context failsMisono Tomohiro1-0/+2
When dreq is allocated by nfs_direct_req_alloc(), dreq->kref is initialized to 2. Therefore we need to call nfs_direct_req_release() twice to release the allocated dreq. Usually it is called in nfs_file_direct_{read, write}() and nfs_direct_complete(). However, current code only calls nfs_direct_req_relese() once if nfs_get_lock_context() fails in nfs_file_direct_{read, write}(). So, that case would result in memory leak. Fix this by adding the missing call. Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-18nfs: Fix up documentation in nfs_follow_referral() and nfs_do_submount()Trond Myklebust2-5/+2
Fallout from the mount patches. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16nfsd: export upcalls must not return ESTALE when mountd is downTrond Myklebust1-5/+6
If the rpc.mountd daemon goes down, then that should not cause all exports to start failing with ESTALE errors. Let's explicitly distinguish between the cache upcall cases that need to time out, and those that do not. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-03-16nfs: Replace zero-length array with flexible-array memberGustavo A. R. Silva2-2/+2
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFSv4.2: error out when relink swapfileMurphy Zhou1-0/+3
This fixes xfstests generic/356 failure on NFSv4.2. Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFS:remove redundant call to nfs_do_accessZhouyi Zhou1-8/+1
In function nfs_permission: 1. the rcu_read_lock and rcu_read_unlock around nfs_do_access is unnecessary because the rcu critical data structure is already protected in subsidiary function nfs_access_get_cached_rcu. No other data structure needs rcu_read_lock in nfs_do_access. 2. call nfs_do_access once is enough, because: 2-1. when mask has MAY_NOT_BLOCK bit The second call to nfs_do_access will not happen. 2-2. when mask has no MAY_NOT_BLOCK bit The second call to nfs_do_access will happen if res == -ECHILD, which means the first nfs_do_access goes out after statement if (!may_block). The second call to nfs_do_access will go through this procedure once again except continue the work after if (!may_block). But above work can be performed by only one call to nfs_do_access without mangling the mask flag. Tested in x86_64 Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFSv4: Add support for CB_RECALL_ANY for flexfiles layoutsTrond Myklebust7-18/+186
When we receive a CB_RECALL_ANY that asks us to return flexfiles layouts, we iterate through all the layouts and look at whether or not there are active open file descriptors that might need them for I/O. If there are no such descriptors, we return the layouts. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFSv4: Clean up nfs_delegation_reap_expired()Trond Myklebust1-43/+40
Convert to use nfs_client_for_each_server() for efficiency. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFSv4: Clean up nfs_delegation_reap_unclaimed()Trond Myklebust1-39/+37
Convert nfs_delegation_reap_unclaimed() to use nfs_client_for_each_server() for efficiency. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-16NFSv4: Clean up nfs_client_return_marked_delegations()Trond Myklebust1-69/+60
Convert it to use the nfs_client_for_each_server() helper, and make it more efficient by skipping delegations for inodes we know are in the process of being freed. Also improve the efficiency of the cursor by skipping delegations that are being freed. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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