Hyper-V identifies vCPUs by Virtual Processor Index, which can be
queried via HV_X64_MSR_VP_INDEX msr. It is defined by the spec as a
sequential number which can't exceed the maximum number of vCPUs per VM.
APIC ids can be sparse and thus aren't a valid replacement for VP
indices.
Current KVM uses its internal vcpu index as VP_INDEX. However, to make
it predictable and persistent across VM migrations, the userspace has to
control the value of VP_INDEX.
This patch achieves that, by storing vp_index explicitly on vcpu, and
allowing HV_X64_MSR_VP_INDEX to be set from the host side. For
compatibility it's initialized to KVM vcpu index. Also a few variables
are renamed to make clear distinction betweed this Hyper-V vp_index and
KVM vcpu_id (== APIC id). Besides, a new capability,
KVM_CAP_HYPERV_VP_INDEX, is added to allow the userspace to skip
attempting msr writes where unsupported, to avoid spamming error logs.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Adds another flag bit (bit 2) to MSR_KVM_ASYNC_PF_EN. If bit 2 is 1,
async page faults are delivered to L1 as #PF vmexits; if bit 2 is 0,
kvm_can_do_async_pf returns 0 if in guest mode.
This is similar to what svm.c wanted to do all along, but it is only
enabled for Linux as L1 hypervisor. Foreign hypervisors must never
receive async page faults as vmexits, because they'd probably be very
confused about that.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Add an nested_apf field to vcpu->arch.exception to identify an async page
fault, and constructs the expected vm-exit information fields. Force a
nested VM exit from nested_vmx_check_exception() if the injected #PF is
async page fault.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This patch adds the L1 guest async page fault #PF vmexit handler, such
by L1 similar to ordinary async page fault.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
[Passed insn parameters to kvm_mmu_page_fault().]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This patch removes all arguments except the first in
kvm_x86_ops->queue_exception since they can extract the arguments from
vcpu->arch.exception themselves.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Provide more specific examples of keyring restrictions as applied to
X.509 signature chain verification.
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Syscalls must validate that their reserved arguments are zero and return
EINVAL otherwise. Otherwise, it will be impossible to actually use them
for anything in the future because existing programs may be passing
garbage in. This is standard practice when adding new APIs.
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
It's a bit hard for eye to track certs/Makefile if you are not
accustomed to it. This commit adds comments to key endif statements in
order to help to keep the context while reading this file.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
In the iomap implementations of SEEK_HOLE and SEEK_DATA, make sure we
return -ENXIO for negative offsets.
Inspired-by: Mateusz S <muttdini@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This reverts commit 50e0bdbe9f.
The new XFS_QMOPT_NOLOCK isn't used at all, and conditional locking based
on a flag is always the wrong thing to do - we should be having helpers
that can be called without the lock instead.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
The comment mentioned the wrong lock. Also add an ASSERT to assert
this locking precondition.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Stable bugfixes:
- Fix -EACCESS on commit to DS handling
- Fix initialization of nfs_page_array->npages
- Only invalidate dentries that are actually invalid
Features:
- Enable NFSoRDMA transparent state migration
- Add support for lookup-by-filehandle
- Add support for nfs re-exporting
Other bugfixes and cleanups:
- Christoph cleaned up the way we declare NFS operations
- Clean up various internal structures
- Various cleanups to commits
- Various improvements to error handling
- Set the dt_type of . and .. entries in NFS v4
- Make slot allocation more reliable
- Fix fscache stat printing
- Fix uninitialized variable warnings
- Fix potential list overrun in nfs_atomic_open()
- Fix a race in NFSoRDMA RPC reply handler
- Fix return size for nfs42_proc_copy()
- Fix against MAC forgery timing attacks
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Merge tag 'nfs-for-4.13-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client updates from Anna Schumaker:
"Stable bugfixes:
- Fix -EACCESS on commit to DS handling
- Fix initialization of nfs_page_array->npages
- Only invalidate dentries that are actually invalid
Features:
- Enable NFSoRDMA transparent state migration
- Add support for lookup-by-filehandle
- Add support for nfs re-exporting
Other bugfixes and cleanups:
- Christoph cleaned up the way we declare NFS operations
- Clean up various internal structures
- Various cleanups to commits
- Various improvements to error handling
- Set the dt_type of . and .. entries in NFS v4
- Make slot allocation more reliable
- Fix fscache stat printing
- Fix uninitialized variable warnings
- Fix potential list overrun in nfs_atomic_open()
- Fix a race in NFSoRDMA RPC reply handler
- Fix return size for nfs42_proc_copy()
- Fix against MAC forgery timing attacks"
* tag 'nfs-for-4.13-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (68 commits)
NFS: Don't run wake_up_bit() when nobody is waiting...
nfs: add export operations
nfs4: add NFSv4 LOOKUPP handlers
nfs: add a nfs_ilookup helper
nfs: replace d_add with d_splice_alias in atomic_open
sunrpc: use constant time memory comparison for mac
NFSv4.2 fix size storage for nfs42_proc_copy
xprtrdma: Fix documenting comments in frwr_ops.c
xprtrdma: Replace PAGE_MASK with offset_in_page()
xprtrdma: FMR does not need list_del_init()
xprtrdma: Demote "connect" log messages
NFSv4.1: Use seqid returned by EXCHANGE_ID after state migration
NFSv4.1: Handle EXCHGID4_FLAG_CONFIRMED_R during NFSv4.1 migration
xprtrdma: Don't defer MR recovery if ro_map fails
xprtrdma: Fix FRWR invalidation error recovery
xprtrdma: Fix client lock-up after application signal fires
xprtrdma: Rename rpcrdma_req::rl_free
xprtrdma: Pass only the list of registered MRs to ro_unmap_sync
xprtrdma: Pre-mark remotely invalidated MRs
xprtrdma: On invalidation failure, remove MWs from rl_registered
...
Pull SCSI target updates from Nicholas Bellinger:
"It's been usually busy for summer, with most of the efforts centered
around TCMU developments and various target-core + fabric driver bug
fixing activities. Not particularly large in terms of LoC, but lots of
smaller patches from many different folks.
The highlights include:
- ibmvscsis logical partition manager support (Michael Cyr + Bryant
Ly)
- Convert target/iblock WRITE_SAME to blkdev_issue_zeroout (hch +
nab)
- Add support for TMR percpu LUN reference counting (nab)
- Fix a potential deadlock between EXTENDED_COPY and iscsi shutdown
(Bart)
- Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce (Jiang Yi)
- Fix TMCU module removal (Xiubo Li)
- Fix iser-target OOPs during login failure (Andrea Righi + Sagi)
- Breakup target-core free_device backend driver callback (mnc)
- Perform TCMU add/delete/reconfig synchronously (mnc)
- Fix TCMU multiple UIO open/close sequences (mnc)
- Fix TCMU CHECK_CONDITION sense handling (mnc)
- Fix target-core SAM_STAT_BUSY + TASK_SET_FULL handling (mnc + nab)
- Introduce TYPE_ZBC support in PSCSI (Damien Le Moal)
- Fix possible TCMU memory leak + OOPs when recalculating cmd base
size (Xiubo Li + Bryant Ly + Damien Le Moal + mnc)
- Add login_keys_workaround attribute for non RFC initiators (Robert
LeBlanc + Arun Easi + nab)"
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (68 commits)
iscsi-target: Add login_keys_workaround attribute for non RFC initiators
Revert "qla2xxx: Fix incorrect tcm_qla2xxx_free_cmd use during TMR ABORT"
tcmu: clean up the code and with one small fix
tcmu: Fix possbile memory leak / OOPs when recalculating cmd base size
target: export lio pgr/alua support as device attr
target: Fix return sense reason in target_scsi3_emulate_pr_out
target: Fix cmd size for PR-OUT in passthrough_parse_cdb
tcmu: Fix dev_config_store
target: pscsi: Introduce TYPE_ZBC support
target: Use macro for WRITE_VERIFY_32 operation codes
target: fix SAM_STAT_BUSY/TASK_SET_FULL handling
target: remove transport_complete
pscsi: finish cmd processing from pscsi_req_done
tcmu: fix sense handling during completion
target: add helper to copy sense to se_cmd buffer
target: do not require a transport_complete for SCF_TRANSPORT_TASK_SENSE
target: make device_mutex and device_list static
tcmu: Fix flushing cmd entry dcache page
tcmu: fix multiple uio open/close sequences
tcmu: drop configured check in destroy
...
"perf lock" shows fairly heavy contention for the bit waitqueue locks
when doing an I/O heavy workload.
Use a bit to tell whether or not there has been contention for a lock
so that we can optimise away the bit waitqueue options in those cases.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This support for opening files on NFS by file handle, both through the
open_by_handle syscall, and for re-exporting NFS (for example using a
different version). The support is very basic for now, as each open by
handle will have to do an NFSv4 open operation on the wire. In the
future this will hopefully be mitigated by an open file cache, as well
as various optimizations in NFS for this specific case.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
[hch: incorporated various changes, resplit the patches, new changelog]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
RPC-over-RDMA transport to use the new rdma_rw API.
Christoph cleaned the way nfs operations are declared, removing a bunch
of function-pointer casts and declaring the operation vectors as const.
Christoph's changes touch both client and server, and both client and
server pulls this time around should be based on the same commits from
Christoph.
(Note: Anna and I initially didn't coordinate this well and we realized
our pull requests were going to leave you with Christoph's 33 patches
duplicated between our two trees. We decided a last-minute rebase was
the lesser of two evils, so her pull request will show that last-minute
rebase. Yell if that was the wrong choice, and we'll know better for
next time....)
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Merge tag 'nfsd-4.13' of git://linux-nfs.org/~bfields/linux
Pull nfsd updates from Bruce Fields:
"Chuck's RDMA update overhauls the "call receive" side of the
RPC-over-RDMA transport to use the new rdma_rw API.
Christoph cleaned the way nfs operations are declared, removing a
bunch of function-pointer casts and declaring the operation vectors as
const.
Christoph's changes touch both client and server, and both client and
server pulls this time around should be based on the same commits from
Christoph"
* tag 'nfsd-4.13' of git://linux-nfs.org/~bfields/linux: (53 commits)
svcrdma: fix an incorrect check on -E2BIG and -EINVAL
nfsd4: factor ctime into change attribute
svcrdma: Remove svc_rdma_chunk_ctxt::cc_dir field
svcrdma: use offset_in_page() macro
svcrdma: Clean up after converting svc_rdma_recvfrom to rdma_rw API
svcrdma: Clean-up svc_rdma_unmap_dma
svcrdma: Remove frmr cache
svcrdma: Remove unused Read completion handlers
svcrdma: Properly compute .len and .buflen for received RPC Calls
svcrdma: Use generic RDMA R/W API in RPC Call path
svcrdma: Add recvfrom helpers to svc_rdma_rw.c
sunrpc: Allocate up to RPCSVC_MAXPAGES per svc_rqst
svcrdma: Don't account for Receive queue "starvation"
svcrdma: Improve Reply chunk sanity checking
svcrdma: Improve Write chunk sanity checking
svcrdma: Improve Read chunk sanity checking
svcrdma: Remove svc_rdma_marshal.c
svcrdma: Avoid Send Queue overflow
svcrdma: Squelch disconnection messages
sunrpc: Disable splice for krb5i
...
Pull ext2, udf, reiserfs fixes from Jan Kara:
"Several ext2, udf, and reiserfs fixes"
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
ext2: Fix memory leak when truncate races ext2_get_blocks
reiserfs: fix race in prealloc discard
reiserfs: don't preallocate blocks for extended attributes
udf: Convert udf_disk_stamp_to_time() to use mktime64()
udf: Use time64_to_tm for timestamp conversion
udf: Fix deadlock between writeback and udf_setsize()
udf: Use i_size_read() in udf_adinicb_writepage()
udf: Fix races with i_size changes during readpage
udf: Remove unused UDF_DEFAULT_BLOCKSIZE
removal of kernel/rcu/srcu.c. Also correct a stray pointer in
memory-barriers.txt.
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Merge tag '4.13-fixes' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet:
"A set of fixes for various warnings, including the one caused by the
removal of kernel/rcu/srcu.c. Also correct a stray pointer in
memory-barriers.txt"
* tag '4.13-fixes' of git://git.lwn.net/linux:
kokr/memory-barriers.txt: Fix obsolete link to atomic_ops.txt
memory-barriers.txt: Fix broken link to atomic_ops.txt
docs: Turn off section numbering for the input docs
docs: Include uaccess docs from the right file
docs: Do not include from kernel/rcu/srcu.c
- Move generic-y of exported headers to uapi/asm/Kbuild
for complete de-coupling of UAPI
- Clean up scripts/Makefile.headersinst
- Fix host programs for 32 bit machine with XFS file system
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Merge tag 'kbuild-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull more Kbuild updates from Masahiro Yamada:
- Move generic-y of exported headers to uapi/asm/Kbuild for complete
de-coupling of UAPI
- Clean up scripts/Makefile.headersinst
- Fix host programs for 32 bit machine with XFS file system
* tag 'kbuild-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (29 commits)
kbuild: Enable Large File Support for hostprogs
kbuild: remove wrapper files handling from Makefile.headersinst
kbuild: split exported generic header creation into uapi-asm-generic
kbuild: do not include old-kbuild-file from Makefile.headersinst
xtensa: move generic-y of exported headers to uapi/asm/Kbuild
unicore32: move generic-y of exported headers to uapi/asm/Kbuild
tile: move generic-y of exported headers to uapi/asm/Kbuild
sparc: move generic-y of exported headers to uapi/asm/Kbuild
sh: move generic-y of exported headers to uapi/asm/Kbuild
parisc: move generic-y of exported headers to uapi/asm/Kbuild
openrisc: move generic-y of exported headers to uapi/asm/Kbuild
nios2: move generic-y of exported headers to uapi/asm/Kbuild
nios2: remove unneeded arch/nios2/include/(generated/)asm/signal.h
microblaze: move generic-y of exported headers to uapi/asm/Kbuild
metag: move generic-y of exported headers to uapi/asm/Kbuild
m68k: move generic-y of exported headers to uapi/asm/Kbuild
m32r: move generic-y of exported headers to uapi/asm/Kbuild
ia64: remove redundant generic-y += kvm_para.h from asm/Kbuild
hexagon: move generic-y of exported headers to uapi/asm/Kbuild
h8300: move generic-y of exported headers to uapi/asm/Kbuild
...
- Show the tgid mappings for user space trace tools to use
- Fix and optimize the comm and tgid cache recording
- Sanitize derived kprobe names
- Ftrace selftest updates
- trace file header fix
- Update of Documentation/trace/ftrace.txt
- Compiler warning fixes
- Fix possible uninitialized variable
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Merge tag 'trace-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull more tracing updates from Steven Rostedt:
"A few more minor updates:
- Show the tgid mappings for user space trace tools to use
- Fix and optimize the comm and tgid cache recording
- Sanitize derived kprobe names
- Ftrace selftest updates
- trace file header fix
- Update of Documentation/trace/ftrace.txt
- Compiler warning fixes
- Fix possible uninitialized variable"
* tag 'trace-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
ftrace: Fix uninitialized variable in match_records()
ftrace: Remove an unneeded NULL check
ftrace: Hide cached module code for !CONFIG_MODULES
tracing: Do note expose stack_trace_filter without DYNAMIC_FTRACE
tracing: Update Documentation/trace/ftrace.txt
tracing: Fixup trace file header alignment
selftests/ftrace: Add a testcase for kprobe event naming
selftests/ftrace: Add a test to probe module functions
selftests/ftrace: Update multiple kprobes test for powerpc
trace/kprobes: Sanitize derived event names
tracing: Attempt to record other information even if some fail
tracing: Treat recording tgid for idle task as a success
tracing: Treat recording comm for idle task as a success
tracing: Add saved_tgids file to show cached pid to tgid mappings
This will be needed in order to implement the get_parent export op
for nfsd.
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This helper will allow to find an existing NFS inode by the file handle
and fattr.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
It's a trival change but follows knfsd export document that asks
for d_splice_alias during lookup.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Otherwise, we enable a MAC forgery via timing attack.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Anna Schumaker <anna.schumaker@netapp.com>
Cc: linux-nfs@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Return size of COPY is u64 but it was assigned to an "int" status.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Clean up.
FASTREG and LOCAL_INV WRs are typically not signaled. localinv_wake
is used for the last LOCAL_INV WR in a chain, which is always
signaled. The documenting comments should reflect that.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Clean up.
Commit 38f1932e60 ("xprtrdma: Remove FMRs from the unmap list
after unmapping") utilized list_del_init() to try to prevent some
list corruption. The corruption was actually caused by the reply
handler racing with a signal. Now that MR invalidation is properly
serialized, list_del_init() can safely be replaced.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Some have complained about the log messages generated when xprtrdma
opens or closes a connection to a server. When an NFS mount is
mostly idle these can appear every few minutes as the client idles
out the connection and reconnects.
Connection and disconnection is a normal part of operation, and not
exceptional, so change these to dprintk's for now. At some point
all of these will be converted to tracepoints, but that's for
another day.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Transparent State Migration copies a client's lease state from the
server where a filesystem used to reside to the server where it now
resides. When an NFSv4.1 client first contacts that destination
server, it uses EXCHANGE_ID to detect trunking relationships.
The lease that was copied there is returned to that client, but the
destination server sets EXCHGID4_FLAG_CONFIRMED_R when replying to
the client. This is because the lease was confirmed on the source
server (before it was copied).
When CONFIRMED_R is set, the client throws away the sequence ID
returned by the server. During a Transparent State Migration, however
there's no other way for the client to know what sequence ID to use
with a lease that's been migrated.
Therefore, the client must save and use the contrived slot sequence
value returned by the destination server even when CONFIRMED_R is
set.
Note that some servers always return a seqid of 1 after a migration.
Reported-by: Xuan Qi <xuan.qi@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Xuan Qi <xuan.qi@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Transparent State Migration copies a client's lease state from the
server where a filesystem used to reside to the server where it now
resides. When an NFSv4.1 client first contacts that destination
server, it uses EXCHANGE_ID to detect trunking relationships.
The lease that was copied there is returned to that client, but the
destination server sets EXCHGID4_FLAG_CONFIRMED_R when replying to
the client. This is because the lease was confirmed on the source
server (before it was copied).
Normally, when CONFIRMED_R is set, a client purges the lease and
creates a new one. However, that throws away the entire benefit of
Transparent State Migration.
Therefore, the client must not purge that lease when it is possible
that Transparent State Migration has occurred.
Reported-by: Xuan Qi <xuan.qi@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Xuan Qi <xuan.qi@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Deferred MR recovery does a DMA-unmapping of the MW. However, ro_map
invokes rpcrdma_defer_mr_recovery in some error cases where the MW
has not even been DMA-mapped yet.
Avoid a DMA-unmapping error replacing rpcrdma_defer_mr_recovery.
Also note that if ib_dma_map_sg is asked to map 0 nents, it will
return 0. So the extra "if (i == 0)" check is no longer needed.
Fixes: 42fe28f607 ("xprtrdma: Do not leak an MW during a DMA ...")
Fixes: 505bbe64dd ("xprtrdma: Refactor MR recovery work queues")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
When ib_post_send() fails, all LOCAL_INV WRs past @bad_wr have to be
examined, and the MRs reset by hand.
I'm not sure how the existing code can work by comparing R_keys.
Restructure the logic so that instead it walks the chain of WRs,
starting from the first bad one.
Make sure to wait for completion if at least one WR was actually
posted. Otherwise, if the ib_post_send fails, we can end up
DMA-unmapping the MR while LOCAL_INV operations are in flight.
Commit 7a89f9c626 ("xprtrdma: Honor ->send_request API contract")
added the rdma_disconnect() call site. The disconnect actually
causes more problems than it solves, and SQ overruns happen only as
a result of software bugs. So remove it.
Fixes: d7a21c1bed ("xprtrdma: Reset MRs in frwr_op_unmap_sync()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
After a signal, the RPC client aborts synchronous RPCs running on
behalf of the signaled application.
The server is still executing those RPCs, and will write the results
back into the client's memory when it's done. By the time the server
writes the results, that memory is likely being used for other
purposes. Therefore xprtrdma has to immediately invalidate all
memory regions used by those aborted RPCs to prevent the server's
writes from clobbering that re-used memory.
With FMR memory registration, invalidation takes a relatively long
time. In fact, the invalidation is often still running when the
server tries to write the results into the memory regions that are
being invalidated.
This sets up a race between two processes:
1. After the signal, xprt_rdma_free calls ro_unmap_safe.
2. While ro_unmap_safe is still running, the server replies and
rpcrdma_reply_handler runs, calling ro_unmap_sync.
Both processes invoke ib_unmap_fmr on the same FMR.
The mlx4 driver allows two ib_unmap_fmr calls on the same FMR at
the same time, but HCAs generally don't tolerate this. Sometimes
this can result in a system crash.
If the HCA happens to survive, rpcrdma_reply_handler continues. It
removes the rpc_rqst from rq_list and releases the transport_lock.
This enables xprt_rdma_free to run in another process, and the
rpc_rqst is released while rpcrdma_reply_handler is still waiting
for the ib_unmap_fmr call to finish.
But further down in rpcrdma_reply_handler, the transport_lock is
taken again, and "rqst" is dereferenced. If "rqst" has already been
released, this triggers a general protection fault. Since bottom-
halves are disabled, the system locks up.
Address both issues by reversing the order of the xprt_lookup_rqst
call and the ro_unmap_sync call. Introduce a separate lookup
mechanism for rpcrdma_req's to enable calling ro_unmap_sync before
xprt_lookup_rqst. Now the handler takes the transport_lock once
and holds it for the XID lookup and RPC completion.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Clean up: I'm about to use the rl_free field for purposes other than
a free list. So use a more generic name.
This is a refactoring change only.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
There are rare cases where an rpcrdma_req can be re-used (via
rpcrdma_buffer_put) while the RPC reply handler is still running.
This is due to a signal firing at just the wrong instant.
Since commit 9d6b040978 ("xprtrdma: Place registered MWs on a
per-req list"), rpcrdma_mws are self-contained; ie., they fully
describe an MR and scatterlist, and no part of that information is
stored in struct rpcrdma_req.
As part of closing the above race window, pass only the req's list
of registered MRs to ro_unmap_sync, rather than the rpcrdma_req
itself.
Some extra transport header sanity checking is removed. Since the
client depends on its own recollection of what memory had been
registered, there doesn't seem to be a way to abuse this change.
And, the check was not terribly effective. If the client had sent
Read chunks, the "list_empty" test is negative in both of the
removed cases, which are actually looking for Write or Reply
chunks.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
There are rare cases where an rpcrdma_req and its matched
rpcrdma_rep can be re-used, via rpcrdma_buffer_put, while the RPC
reply handler is still using that req. This is typically due to a
signal firing at just the wrong instant.
As part of closing this race window, avoid using the wrong
rpcrdma_rep to detect remotely invalidated MRs. Mark MRs as
invalidated while we are sure the rep is still OK to use.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Callers assume the ro_unmap_sync and ro_unmap_safe methods empty
the list of registered MRs. Ensure that all paths through
fmr_op_unmap_sync() remove MWs from that list.
Fixes: 9d6b040978 ("xprtrdma: Place registered MWs on a ... ")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
If an NFS server returns a filehandle that we have previously
seen, and reports a different type, then nfs_refresh_inode()
will log a warning and return an error.
nfs_fhget() does not check for this error and may return an
inode with a different type than the one that the server
reported.
This is likely to cause confusion, and is one way that
->open_context() could return a directory inode as discussed
in the previous patch.
So if nfs_refresh_inode() returns and error, return that error
from nfs_fhget() to avoid the confusion propagating.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
A confused server could return a filehandle for an
NFSv4 OPEN request, which it previously returned for a directory.
So the inode returned by ->open_context() in nfs_atomic_open()
could conceivably be a directory inode.
This has particular implications for the call to
nfs_file_set_open_context() in nfs_finish_open().
If that is called on a directory inode, then the nfs_open_context
that gets stored in the filp->private_data will be linked to
nfs_inode->open_files.
When the directory is closed, nfs_closedir() will (ultimately)
free the ->private_data, but not unlink it from nfs_inode->open_files
(because it doesn't expect an nfs_open_context there).
Subsequently the memory could get used for something else and eventually
if the ->open_files list is walked, the walker will fall off the end and
crash.
So: change nfs_finish_open() to only call nfs_file_set_open_context()
for regular-file inodes.
This failure mode has been seen in a production setting (unknown NFS
server implementation). The kernel was v3.0 and the specific sequence
seen would not affect more recent kernels, but I think a risk is still
present, and caution is wise.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Since commit bafc9b754f ("vfs: More precise tests in d_invalidate")
in v3.18, a return of '0' from ->d_revalidate() will cause the dentry
to be invalidated even if it has filesystems mounted on or it or on a
descendant. The mounted filesystem is unmounted.
This means we need to be careful not to return 0 unless the directory
referred to truly is invalid. So -ESTALE or -ENOENT should invalidate
the directory. Other errors such a -EPERM or -ERESTARTSYS should be
returned from ->d_revalidate() so they are propagated to the caller.
A particular problem can be demonstrated by:
1/ mount an NFS filesystem using NFSv3 on /mnt
2/ mount any other filesystem on /mnt/foo
3/ ls /mnt/foo
4/ turn off network, or otherwise make the server unable to respond
5/ ls /mnt/foo &
6/ cat /proc/$!/stack # note that nfs_lookup_revalidate is in the call stack
7/ kill -9 $! # this results in -ERESTARTSYS being returned
8/ observe that /mnt/foo has been unmounted.
This patch changes nfs_lookup_revalidate() to only treat
-ESTALE from nfs_lookup_verify_inode() and
-ESTALE or -ENOENT from ->lookup()
as indicating an invalid inode. Other errors are returned.
Also nfs_check_inode_attributes() is changed to return -ESTALE rather
than -EIO. This is consistent with the error returned in similar
circumstances from nfs_update_inode().
As this bug allows any user to unmount a filesystem mounted on an NFS
filesystem, this fix is suitable for stable kernels.
Fixes: bafc9b754f ("vfs: More precise tests in d_invalidate")
Cc: stable@vger.kernel.org (v3.18+)
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Upon receiving a stateid error such as BAD_STATEID, the client
should retry the operation against the MDS before deciding to
do stateid recovery.
Previously, the code would initiate state recovery and it could
lead to a race in a state manager that could chose an incorrect
recovery method which would lead to the EIO failure for the
application.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Commit fabbbee0eb "PNFS fix fallback to MDS if got error on
commit to DS" moved the pnfs_set_lo_fail() to unhandled errors
which was not correct and lead to a kernel oops on umount.
Instead, fix the original EACCESS on commit to DS error by
getting the new layout and re-doing the IO.
Fixes: fabbbee0eb ("PNFS fix fallback to MDS if got error on commit to DS")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Cc: stable@vger.kernel.org # v4.12
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
David Sterba