Add tracing to track how often the client goes to the server for updated
readdir information.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If the revalidation was forced, due to the presence of a LOOKUP_EXCL or
a LOOKUP_REVAL flag, then readdirplus won't help. It also can't help
when we're doing a path component lookup.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If the filesystem is case insensitive, then readdirplus can't help with
cache misses, since it won't return case folded variants of the filename.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Instead of pretending that we know the ratio of directory info vs
readdirplus attribute info, just set the 'dircount' field to the same
value as the 'maxcount' field.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If attribute caching is turned off, then use of readdirplus is not going
to help stat() performance.
Readdirplus also doesn't help if a file is being written to, since we
will have to flush those writes in order to sync the mtime/ctime.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
The heuristic for readdirplus is designed to try to detect 'ls -l' and
similar patterns. It does so by looking for cache hit/miss patterns in
both the attribute cache and in the dcache of the files in a given
directory, and then sets a flag for the readdirplus code to interpret.
The problem with this approach is that a single attribute or dcache miss
can cause the NFS code to force a refresh of the attributes for the
entire set of files contained in the directory.
To be able to make a more nuanced decision, let's sample the number of
hits and misses in the set of open directory descriptors. That allows us
to set thresholds at which we start preferring READDIRPLUS over regular
READDIR, or at which we start to force a re-read of the remaining
readdir cache using READDIRPLUS.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When reading a very large directory, we want to try to keep the page
cache up to date if doing so is inexpensive. With the change to allow
readdir to continue reading even when the cache is incomplete, we no
longer need to fall back to uncached readdir in order to scale to large
directories.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Recent changes to readdir mean that we can cope with partially filled
page cache entries, so we no longer need to rely on looping in
nfs_readdir_xdr_to_array().
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Ensure that if the cookie verifier changes when we use the zero-valued
cookie, then we invalidate any cached pages.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
The current NFS readdir code will always try to maximise the amount of
readahead it performs on the assumption that we can cache anything that
isn't immediately read by the process.
There are several cases where this assumption breaks down, including
when the 'ls -l' heuristic kicks in to try to force use of readdirplus
as a batch replacement for lookup/getattr.
This patch therefore tries to tone down the amount of readahead we
perform, and adjust it to try to match the amount of data being
requested by user space.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When we hit the end of the data in the readdir page, we don't want to
start filling a new page, unless this one is full.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If the page cache entry that was last read gets invalidated for some
reason, then make sure we can re-create it on the next call to readdir.
This, combined with the cache page validation, allows us to reuse the
cached value of page-index on successive calls to nfs_readdir.
Credit is due to Benjamin Coddington for showing that the concept works,
and that it allows for improved cache sharing between processes even in
the case where pages are lost due to LRU or active invalidation.
Suggested-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Use the change attribute and the first cookie in a directory page cache
entry to validate that the page is up to date.
Suggested-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Instead of relying on counting the page offsets as we walk through the
page cache, switch to calculating them algorithmically.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
For the purpose of ensuring that opendir() followed by seekdir() work as
correctly as possible, try to initialise the readdir verifier in
nfs_opendir().
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Valid return values for decode_dirent() callback functions are:
0: Success
-EBADCOOKIE: End of directory
-EAGAIN: End of xdr_stream
All errors need to map into one of those three values.
Fixes: 573c4e1ef5 ("NFS: Simplify ->decode_dirent() calling sequence")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This reverts commit 50c790a0b6.
The functionality is believed to be capable of causing regressions in
existing setups, so the author has requested that it be reverted.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
The use of mapping_set_error() in conjunction with calls to
filemap_check_errors() is problematic because every error gets reported
as either an EIO or an ENOSPC by filemap_check_errors() in functions
such as filemap_write_and_wait() or filemap_write_and_wait_range().
In almost all cases, we prefer to use the more nuanced wb errors.
Fixes: b8946d7bfb ("NFS: Revalidate the file mapping on all fatal writeback errors")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
We should never expect the 'xattr_cache' to be non-null in that case,
hence nfs_set_cache_invalid() is just going to optimise it away.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Ensure that we always initialise the 'xattr_support' field in struct
nfs_fsinfo, so that nfs_server_set_fsinfo() doesn't declare our NFSv2/v3
client to be capable of supporting the NFSv4.2 xattr protocol by setting
the NFS_CAP_XATTR capability.
This configuration can cause nfs_do_access() to set access mode bits
that are unsupported by the NFSv3 ACCESS call, which may confuse
spec-compliant servers.
Reported-by: Olga Kornievskaia <kolga@netapp.com>
Fixes: b78ef845c3 ("NFSv4.2: query the server for extended attribute support")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Now that we have more fine grained attribute revalidation, let's just
get rid of NFS_INO_REVAL_PAGECACHE.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
In order to differentiate client state, assign a random uuid to the
uniquifing portion of the client identifier when a network namespace is
created. Containers may still override this value if they wish to maintain
stable client identifiers by writing to /sys/fs/nfs/net/client/identifier,
either by udev rules or other means.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
In 4.1+, the server is allowed to set a flag
NFS4_RESULT_PRESERVE_UNLINKED in reply to the OPEN, that tells
the client that it does not need to do a silly rename of an
opened file when it's being removed.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
The sections which should not re-enter the filesystem are already
protected with memalloc_nofs_save/restore calls, so it is better to use
GFP_KERNEL in these calls to allow better performance for synchronous
RPC calls.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
There doesn't seem to be any reason why the copy offload code can't use
GFP_KERNEL. It can't get called by direct reclaim.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Assume that the higher layers will have set memalloc_nofs_save/restore
as appropriate.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Assume that sections that should not re-enter the filesystem are already
protected with memalloc_nofs_save/restore call, so relax those GFP_NOFS
instances which might be used by other contexts.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
We should use either GFP_KERNEL or GFP_NOFS, but not both. Also strip
GFP_KERNEL_ACCOUNT down to GFP_KERNEL. This memory is shrinkable, so
does not need to be limited by kmemcg.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Allow kmemcg to limit the number of open/lock file contexts, in the same
way that it limits the parent file descriptors.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If memory allocation triggers a direct reclaim from the state recovery
thread, then we can deadlock. Use memalloc_nofs_save/restore to ensure
that doesn't happen.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[You don't often get email from colin.i.king@gmail.com. Learn why this is important at http://aka.ms/LearnAboutSenderIdentification.]
Pointer plainhdr is being assigned a value that is never read, the
pointer is redundant and can be removed.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[You don't often get email from xiongx18@fudan.edu.cn. Learn why this is important at http://aka.ms/LearnAboutSenderIdentification.]
The reference counting issue happens in two error paths in the
function _nfs42_proc_copy_notify(). In both error paths, the function
simply returns the error code and forgets to balance the refcount of
object `ctx`, bumped by get_nfs_open_context() earlier, which may
cause refcount leaks.
Fix it by balancing refcount of the `ctx` object before the function
returns in both error paths.
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
NFS is one of the last two users of the deprecated ->readpages aop.
This conversion looks straightforward, but I have only compile-tested
it.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
nfs42_files_from_same_server() is called to check if freeing
cn_resp is required, just do the free.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
- Fix a hang due to bad clk parent in the Ingenic jz4725b driver.
- Fix SD controllers on Qualcomm MSM8994 SoCs by removing clks
that shouldn't be touched.
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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk fixes from Stephen Boyd:
"A couple driver fixes in the clk subsystem
- Fix a hang due to bad clk parent in the Ingenic jz4725b driver
- Fix SD controllers on Qualcomm MSM8994 SoCs by removing clks that
shouldn't be touched"
* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
clk: jz4725b: fix mmc0 clock gating
clk: qcom: gcc-msm8994: Remove NoC clocks
- Fix double free in in the error path when opening perf.data from multiple
files in a directory instead of from a single file.
- Sync the msr-index.h copy with the kernel sources
- Fix error when printing 'weight' field in 'perf script'.
- Skip failing sigtrap test for arm+aarch64 in 'perf test'.
- Fix failure to use a cpu list for uncore events in hybrid systems, e.g. Intel
Alder Lake.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-tools-fixes-for-v5.17-2022-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux
Pull perf tools fixes from Arnaldo Carvalho de Melo:
- Fix double free in in the error path when opening perf.data from
multiple files in a directory instead of from a single file
- Sync the msr-index.h copy with the kernel sources
- Fix error when printing 'weight' field in 'perf script'
- Skip failing sigtrap test for arm+aarch64 in 'perf test'
- Fix failure to use a cpu list for uncore events in hybrid systems,
e.g. Intel Alder Lake
* tag 'perf-tools-fixes-for-v5.17-2022-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
perf script: Fix error when printing 'weight' field
tools arch x86: Sync the msr-index.h copy with the kernel sources
perf data: Fix double free in perf_session__delete()
perf evlist: Fix failed to use cpu list for uncore events
perf test: Skip failing sigtrap test for arm+aarch64
* Expose KVM_CAP_ENABLE_CAP since it is supported
* Disable KVM_HC_CLOCK_PAIRING in TSC catchup mode
* Ensure async page fault token is nonzero
* Fix lockdep false negative
* Fix FPU migration regression from the AMX changes
x86 guest:
* Don't use PV TLB/IPI/yield on uniprocessor guests
PPC:
* reserve capability id (topic branch for ppc/kvm)
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"x86 host:
- Expose KVM_CAP_ENABLE_CAP since it is supported
- Disable KVM_HC_CLOCK_PAIRING in TSC catchup mode
- Ensure async page fault token is nonzero
- Fix lockdep false negative
- Fix FPU migration regression from the AMX changes
x86 guest:
- Don't use PV TLB/IPI/yield on uniprocessor guests
PPC:
- reserve capability id (topic branch for ppc/kvm)"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: nSVM: disallow userspace setting of MSR_AMD64_TSC_RATIO to non default value when tsc scaling disabled
KVM: x86/mmu: make apf token non-zero to fix bug
KVM: PPC: reserve capability 210 for KVM_CAP_PPC_AIL_MODE_3
x86/kvm: Don't use pv tlb/ipi/sched_yield if on 1 vCPU
x86/kvm: Fix compilation warning in non-x86_64 builds
x86/kvm/fpu: Remove kvm_vcpu_arch.guest_supported_xcr0
x86/kvm/fpu: Limit guest user_xfeatures to supported bits of XCR0
kvm: x86: Disable KVM_HC_CLOCK_PAIRING if tsc is in always catchup mode
KVM: Fix lockdep false negative during host resume
KVM: x86: Add KVM_CAP_ENABLE_CAP to x86
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Merge tag 'pci-v5.17-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull pci fixes from Bjorn Helgaas:
- Fix a merge error that broke PCI device enumeration on mvebu
platforms, including Turris Omnia (Armada 385) (Pali Rohár)
- Avoid using ATS on all AMD Navi10 and Navi14 GPUs because some
VBIOSes don't account for "harvested" (disabled) parts of the chip
when initializing caches (Alex Deucher)
* tag 'pci-v5.17-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI: Mark all AMD Navi10 and Navi14 GPU ATS as broken
PCI: mvebu: Fix device enumeration regression
Current release - regressions:
- bpf: fix crash due to out of bounds access into reg2btf_ids
- mvpp2: always set port pcs ops, avoid null-deref
- eth: marvell: fix driver load from initrd
- eth: intel: revert "Fix reset bw limit when DCB enabled with 1 TC"
Current release - new code bugs:
- mptcp: fix race in overlapping signal events
Previous releases - regressions:
- xen-netback: revert hotplug-status changes causing devices to
not be configured
- dsa:
- avoid call to __dev_set_promiscuity() while rtnl_mutex isn't held
- fix panic when removing unoffloaded port from bridge
- dsa: microchip: fix bridging with more than two member ports
Previous releases - always broken:
- bpf:
- fix crash due to incorrect copy_map_value when both spin lock
and timer are present in a single value
- fix a bpf_timer initialization issue with clang
- do not try bpf_msg_push_data with len 0
- add schedule points in batch ops
- nf_tables:
- unregister flowtable hooks on netns exit
- correct flow offload action array size
- fix a couple of memory leaks
- vsock: don't check owner in vhost_vsock_stop() while releasing
- gso: do not skip outer ip header in case of ipip and net_failover
- smc: use a mutex for locking "struct smc_pnettable"
- openvswitch: fix setting ipv6 fields causing hw csum failure
- mptcp: fix race in incoming ADD_ADDR option processing
- sysfs: add check for netdevice being present to speed_show
- sched: act_ct: fix flow table lookup after ct clear or switching
zones
- eth: intel: fixes for SR-IOV forwarding offloads
- eth: broadcom: fixes for selftests and error recovery
- eth: mellanox: flow steering and SR-IOV forwarding fixes
Misc:
- make __pskb_pull_tail() & pskb_carve_frag_list() drop_monitor
friends not report freed skbs as drops
- force inlining of checksum functions in net/checksum.h
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-5.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Jakub Kicinski:
"Including fixes from bpf and netfilter.
Current release - regressions:
- bpf: fix crash due to out of bounds access into reg2btf_ids
- mvpp2: always set port pcs ops, avoid null-deref
- eth: marvell: fix driver load from initrd
- eth: intel: revert "Fix reset bw limit when DCB enabled with 1 TC"
Current release - new code bugs:
- mptcp: fix race in overlapping signal events
Previous releases - regressions:
- xen-netback: revert hotplug-status changes causing devices to not
be configured
- dsa:
- avoid call to __dev_set_promiscuity() while rtnl_mutex isn't
held
- fix panic when removing unoffloaded port from bridge
- dsa: microchip: fix bridging with more than two member ports
Previous releases - always broken:
- bpf:
- fix crash due to incorrect copy_map_value when both spin lock
and timer are present in a single value
- fix a bpf_timer initialization issue with clang
- do not try bpf_msg_push_data with len 0
- add schedule points in batch ops
- nf_tables:
- unregister flowtable hooks on netns exit
- correct flow offload action array size
- fix a couple of memory leaks
- vsock: don't check owner in vhost_vsock_stop() while releasing
- gso: do not skip outer ip header in case of ipip and net_failover
- smc: use a mutex for locking "struct smc_pnettable"
- openvswitch: fix setting ipv6 fields causing hw csum failure
- mptcp: fix race in incoming ADD_ADDR option processing
- sysfs: add check for netdevice being present to speed_show
- sched: act_ct: fix flow table lookup after ct clear or switching
zones
- eth: intel: fixes for SR-IOV forwarding offloads
- eth: broadcom: fixes for selftests and error recovery
- eth: mellanox: flow steering and SR-IOV forwarding fixes
Misc:
- make __pskb_pull_tail() & pskb_carve_frag_list() drop_monitor
friends not report freed skbs as drops
- force inlining of checksum functions in net/checksum.h"
* tag 'net-5.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (85 commits)
net: mv643xx_eth: process retval from of_get_mac_address
ping: remove pr_err from ping_lookup
Revert "i40e: Fix reset bw limit when DCB enabled with 1 TC"
openvswitch: Fix setting ipv6 fields causing hw csum failure
ipv6: prevent a possible race condition with lifetimes
net/smc: Use a mutex for locking "struct smc_pnettable"
bnx2x: fix driver load from initrd
Revert "xen-netback: Check for hotplug-status existence before watching"
Revert "xen-netback: remove 'hotplug-status' once it has served its purpose"
net/mlx5e: Fix VF min/max rate parameters interchange mistake
net/mlx5e: Add missing increment of count
net/mlx5e: MPLSoUDP decap, fix check for unsupported matches
net/mlx5e: Fix MPLSoUDP encap to use MPLS action information
net/mlx5e: Add feature check for set fec counters
net/mlx5e: TC, Skip redundant ct clear actions
net/mlx5e: TC, Reject rules with forward and drop actions
net/mlx5e: TC, Reject rules with drop and modify hdr action
net/mlx5e: kTLS, Use CHECKSUM_UNNECESSARY for device-offloaded packets
net/mlx5e: Fix wrong return value on ioctl EEPROM query failure
net/mlx5: Fix possible deadlock on rule deletion
...
- Fix QGV handling on ADL-P+ (Ville Syrjälä)
- Fix bw atomic check when switching between SAGV vs. no SAGV (Ville Syrjälä)
- Disconnect PHYs left connected by BIOS on disabled ports (Imre Deak)
- Fix SAVG to no SAGV transitions on TGL+ (Ville Syrjälä)
- Print PHY name properly on calibration error (DG2) (Matt Roper)
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YhdyHwRWkOTWwlqi@tursulin-mobl2
Trond Myklebust