softnet_data->time_squeeze is sometimes used as a proxy for
host overload or indication of scheduling problems. In practice
this statistic is very noisy and has hard to grasp units -
e.g. is 10 squeezes a second to be expected, or high?
Delaying network (NAPI) processing leads to drops on NIC queues
but also RTT bloat, impacting pacing and CA decisions.
Stalls are a little hard to detect on the Rx side, because
there may simply have not been any packets received in given
period of time. Packet timestamps help a little bit, but
again we don't know if packets are stale because we're
not keeping up or because someone (*cough* cgroups)
disabled IRQs for a long time.
We can, however, use Tx as a proxy for Rx stalls. Most drivers
use combined Rx+Tx NAPIs so if Tx gets starved so will Rx.
On the Tx side we know exactly when packets get queued,
and completed, so there is no uncertainty.
This patch adds stall checks to BQL. Why BQL? Because
it's a convenient place to add such checks, already
called by most drivers, and it has copious free space
in its structures (this patch adds no extra cache
references or dirtying to the fast path).
The algorithm takes one parameter - max delay AKA stall
threshold and increments a counter whenever NAPI got delayed
for at least that amount of time. It also records the length
of the longest stall.
To be precise every time NAPI has not polled for at least
stall thrs we check if there were any Tx packets queued
between last NAPI run and now - stall_thrs/2.
Unlike the classic Tx watchdog this mechanism does not
ignore stalls caused by Tx being disabled, or loss of link.
I don't think the check is worth the complexity, and
stall is a stall, whether due to host overload, flow
control, link down... doesn't matter much to the application.
We have been running this detector in production at Meta
for 2 years, with the threshold of 8ms. It's the lowest
value where false positives become rare. There's still
a constant stream of reported stalls (especially without
the ksoftirqd deferral patches reverted), those who like
their stall metrics to be 0 may prefer higher value.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Merge tag 'rxrpc-iothread-20240305' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says:
====================
Here are some changes to AF_RXRPC:
(1) Cache the transmission serial number of ACK and DATA packets in the
rxrpc_txbuf struct and log this in the retransmit tracepoint.
(2) Don't use atomics on rxrpc_txbuf::flags[*] and cache the intended wire
header flags there too to avoid duplication.
(3) Cache the wire checksum in rxrpc_txbuf to make it easier to create
jumbo packets in future (which will require altering the wire header
to a jumbo header and restoring it back again for retransmission).
(4) Fix the protocol names in the wire ACK trailer struct.
(5) Strip all the barriers and atomics out of the call timer tracking[*].
(6) Remove atomic handling from call->tx_transmitted and
call->acks_prev_seq[*].
(7) Don't bother resetting the DF flag after UDP packet transmission. To
change it, we now call directly into UDP code, so it's quick just to
set it every time.
(8) Merge together the DF/non-DF branches of the DATA transmission to
reduce duplication in the code.
(9) Add a kvec array into rxrpc_txbuf and start moving things over to it.
This paves the way for using page frags.
(10) Split (sub)packet preparation and timestamping out of the DATA
transmission function. This helps pave the way for future jumbo
packet generation.
(11) In rxkad, don't pick values out of the wire header stored in
rxrpc_txbuf, buf rather find them elsewhere so we can remove the wire
header from there.
(12) Move rxrpc_send_ACK() to output.c so that it can be merged with
rxrpc_send_ack_packet().
(13) Use rxrpc_txbuf::kvec[0] to access the wire header for the packet
rather than directly accessing the copy in rxrpc_txbuf. This will
allow that to be removed to a page frag.
(14) Switch from keeping the transmission buffers in rxrpc_txbuf allocated
in the slab to allocating them using page fragment allocators. There
are separate allocators for DATA packets (which persist for a while)
and control packets (which are discarded immediately).
We can then turn on MSG_SPLICE_PAGES when transmitting DATA and ACK
packets.
We can also get rid of the RCU cleanup on rxrpc_txbufs, preferring
instead to release the page frags as soon as possible.
(15) Parse received packets before handling timeouts as the former may
reset the latter.
(16) Make sure we don't retransmit DATA packets after all the packets have
been ACK'd.
(17) Differentiate traces for PING ACK transmission.
(18) Switch to keeping timeouts as ktime_t rather than a number of jiffies
as the latter is too coarse a granularity. Only set the call timer at
the end of the call event function from the aggregate of all the
timeouts, thereby reducing the number of timer calls made. In future,
it might be possible to reduce the number of timers from one per call
to one per I/O thread and to use a high-precision timer.
(19) Record RTT probes after successful transmission rather than recording
it before and then cancelling it after if unsuccessful[*]. This
allows a number of calls to get the current time to be removed.
(20) Clean up the resend algorithm as there's now no need to walk the
transmission buffer under lock[*]. DATA packets can be retransmitted
as soon as they're found rather than being queued up and transmitted
when the locked is dropped.
(21) When initially parsing a received ACK packet, extract some of the
fields from the ack info to the skbuff private data. This makes it
easier to do path MTU discovery in the future when the call to which a
PING RESPONSE ACK refers has been deallocated.
[*] Possible with the move of almost all code from softirq context to the
I/O thread.
Link: https://lore.kernel.org/r/20240301163807.385573-1-dhowells@redhat.com/ # v1
Link: https://lore.kernel.org/r/20240304084322.705539-1-dhowells@redhat.com/ # v2
* tag 'rxrpc-iothread-20240305' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (21 commits)
rxrpc: Extract useful fields from a received ACK to skb priv data
rxrpc: Clean up the resend algorithm
rxrpc: Record probes after transmission and reduce number of time-gets
rxrpc: Use ktimes for call timeout tracking and set the timer lazily
rxrpc: Differentiate PING ACK transmission traces.
rxrpc: Don't permit resending after all Tx packets acked
rxrpc: Parse received packets before dealing with timeouts
rxrpc: Do zerocopy using MSG_SPLICE_PAGES and page frags
rxrpc: Use rxrpc_txbuf::kvec[0] instead of rxrpc_txbuf::wire
rxrpc: Move rxrpc_send_ACK() to output.c with rxrpc_send_ack_packet()
rxrpc: Don't pick values out of the wire header when setting up security
rxrpc: Split up the DATA packet transmission function
rxrpc: Add a kvec[] to the rxrpc_txbuf struct
rxrpc: Merge together DF/non-DF branches of data Tx function
rxrpc: Do lazy DF flag resetting
rxrpc: Remove atomic handling on some fields only used in I/O thread
rxrpc: Strip barriers and atomics off of timer tracking
rxrpc: Fix the names of the fields in the ACK trailer struct
rxrpc: Note cksum in txbuf
rxrpc: Convert rxrpc_txbuf::flags into a mask and don't use atomics
...
====================
Link: https://lore.kernel.org/r/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Use the existing parameter and print the address of skbaddr
as other trace functions do.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Printing the addresses can help us identify the exact skb/sk
for those system in which it's not that easy to run BPF program.
As we can see, it already fetches those, then use it directly
and it will print like below:
...tcp_retransmit_skb: skbaddr=XXX skaddr=XXX family=AF_INET...
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Track the call timeouts as ktimes rather than jiffies as the latter's
granularity is too high and only set the timer at the end of the event
handling function.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
There are three points that transmit PING ACKs and all of them use the same
trace string. Change two of them to use different strings.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
I'm updating __assign_str() and will be removing the second parameter. To
make sure that it does not break anything, I make sure that it matches the
__string() field, as that is where the string is actually going to be
saved in. To make sure there's nothing that breaks, I added a WARN_ON() to
make sure that what was used in __string() is the same that is used in
__assign_str().
In doing this change, an error was triggered as __assign_str() now expects
the string passed in to be a char * value. I instead had the following
warning:
include/trace/events/qdisc.h: In function ‘trace_event_raw_event_qdisc_reset’:
include/trace/events/qdisc.h:91:35: error: passing argument 1 of 'strcmp' from incompatible pointer type [-Werror=incompatible-pointer-types]
91 | __assign_str(dev, qdisc_dev(q));
That's because the qdisc_enqueue() and qdisc_reset() pass in qdisc_dev(q)
to __assign_str() and to __string(). But that function returns a pointer
to struct net_device and not a string.
It appears that these events are just saving the pointer as a string and
then reading it as a string as well.
Use qdisc_dev(q)->name to save the device instead.
Fixes: a34dac0b90 ("net_sched: add tracepoints for qdisc_reset() and qdisc_destroy()")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
From AFS-3.3 a trailer containing extra info was added to the ACK packet
format - but AF_RXRPC has the names of some of the fields mixed up compared
to other AFS implementations.
Rename the struct and the fields to make them match.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
Convert the transmission buffer flags into a mask and use | and & rather
than bitops functions (atomic ops are not required as only the I/O thread
can manipulate them once submitted for transmission).
The bottom byte can then correspond directly to the Rx protocol header
flags.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
Each Rx protocol packet contains a per-connection monotonically increasing
serial number used to correlate outgoing messages with their replies -
something that can be used for RTT calculation.
Note this value in the rxrpc_txbuf struct in addition to the wire header
and then log it in the rxrpc_retransmit trace for reference.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
Current release - regressions:
- nic: intel: fix old compiler regressions
- netfilter: ipset: missing gc cancellations fixed
Current release - new code bugs:
- netfilter: ctnetlink: fix filtering for zone 0
Previous releases - regressions:
- core: fix from address in memcpy_to_iter_csum()
- netfilter: nfnetlink_queue: un-break NF_REPEAT
- af_unix: fix memory leak for dead unix_(sk)->oob_skb in GC.
- devlink: avoid potential loop in devlink_rel_nested_in_notify_work()
- iwlwifi:
- mvm: fix a battery life regression
- fix double-free bug
- mac80211: fix waiting for beacons logic
- nic: nfp: flower: prevent re-adding mac index for bonded port
Previous releases - always broken:
- rxrpc: fix generation of serial numbers to skip zero
- tipc: check the bearer type before calling tipc_udp_nl_bearer_add()
- tunnels: fix out of bounds access when building IPv6 PMTU error
- nic: hv_netvsc: register VF in netvsc_probe if NET_DEVICE_REGISTER missed
- nic: atlantic: fix DMA mapping for PTP hwts ring
Misc:
- selftests: more fixes to deal with very slow hosts
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Merge tag 'net-6.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Paolo Abeni:
"Including fixes from WiFi and netfilter.
Current release - regressions:
- nic: intel: fix old compiler regressions
- netfilter: ipset: missing gc cancellations fixed
Current release - new code bugs:
- netfilter: ctnetlink: fix filtering for zone 0
Previous releases - regressions:
- core: fix from address in memcpy_to_iter_csum()
- netfilter: nfnetlink_queue: un-break NF_REPEAT
- af_unix: fix memory leak for dead unix_(sk)->oob_skb in GC.
- devlink: avoid potential loop in devlink_rel_nested_in_notify_work()
- iwlwifi:
- mvm: fix a battery life regression
- fix double-free bug
- mac80211: fix waiting for beacons logic
- nic: nfp: flower: prevent re-adding mac index for bonded port
Previous releases - always broken:
- rxrpc: fix generation of serial numbers to skip zero
- tipc: check the bearer type before calling tipc_udp_nl_bearer_add()
- tunnels: fix out of bounds access when building IPv6 PMTU error
- nic: hv_netvsc: register VF in netvsc_probe if NET_DEVICE_REGISTER
missed
- nic: atlantic: fix DMA mapping for PTP hwts ring
Misc:
- selftests: more fixes to deal with very slow hosts"
* tag 'net-6.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (80 commits)
netfilter: nft_set_pipapo: remove scratch_aligned pointer
netfilter: nft_set_pipapo: add helper to release pcpu scratch area
netfilter: nft_set_pipapo: store index in scratch maps
netfilter: nft_set_rbtree: skip end interval element from gc
netfilter: nfnetlink_queue: un-break NF_REPEAT
netfilter: nf_tables: use timestamp to check for set element timeout
netfilter: nft_ct: reject direction for ct id
netfilter: ctnetlink: fix filtering for zone 0
s390/qeth: Fix potential loss of L3-IP@ in case of network issues
netfilter: ipset: Missing gc cancellations fixed
octeontx2-af: Initialize maps.
net: ethernet: ti: cpsw: enable mac_managed_pm to fix mdio
net: ethernet: ti: cpsw_new: enable mac_managed_pm to fix mdio
netfilter: nft_set_pipapo: remove static in nft_pipapo_get()
netfilter: nft_compat: restrict match/target protocol to u16
netfilter: nft_compat: reject unused compat flag
netfilter: nft_compat: narrow down revision to unsigned 8-bits
net: intel: fix old compiler regressions
MAINTAINERS: Maintainer change for rds
selftests: cmsg_ipv6: repeat the exact packet
...
Fix the counting of new acks and nacks when parsing a packet - something
that is used in congestion control.
As the code stands, it merely notes if there are any nacks whereas what we
really should do is compare the previous SACK table to the new one,
assuming we get two successive ACK packets with nacks in them. However, we
really don't want to do that if we can avoid it as the tables might not
correspond directly as one may be shifted from the other - something that
will only get harder to deal with once extended ACK tables come into full
use (with a capacity of up to 8192).
Instead, count the number of nacks shifted out of the old SACK, the number
of nacks retained in the portion still active and the number of new acks
and nacks in the new table then calculate what we need.
Note this ends up a bit of an estimate as the Rx protocol allows acks to be
withdrawn by the receiver and packets requested to be retransmitted.
Fixes: d57a3a1516 ("rxrpc: Save last ACK's SACK table rather than marking txbufs")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
and extent handling code.
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Merge tag 'for-linus-6.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 fixes from Ted Ts'o:
"Miscellaneous bug fixes and cleanups in ext4's multi-block allocator
and extent handling code"
* tag 'for-linus-6.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (23 commits)
ext4: make ext4_set_iomap() recognize IOMAP_DELALLOC map type
ext4: make ext4_map_blocks() distinguish delalloc only extent
ext4: add a hole extent entry in cache after punch
ext4: correct the hole length returned by ext4_map_blocks()
ext4: convert to exclusive lock while inserting delalloc extents
ext4: refactor ext4_da_map_blocks()
ext4: remove 'needed' in trace_ext4_discard_preallocations
ext4: remove unnecessary parameter "needed" in ext4_discard_preallocations
ext4: remove unused return value of ext4_mb_release_group_pa
ext4: remove unused return value of ext4_mb_release_inode_pa
ext4: remove unused return value of ext4_mb_release
ext4: remove unused ext4_allocation_context::ac_groups_considered
ext4: remove unneeded return value of ext4_mb_release_context
ext4: remove unused parameter ngroup in ext4_mb_choose_next_group_*()
ext4: remove unused return value of __mb_check_buddy
ext4: mark the group block bitmap as corrupted before reporting an error
ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()
ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()
ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt
ext4: avoid bb_free and bb_fragments inconsistency in mb_free_blocks()
...
When afs does a lookup, it tries to use FS.InlineBulkStatus to preemptively
look up a bunch of files in the parent directory and cache this locally, on
the basis that we might want to look at them too (for example if someone
does an ls on a directory, they may want want to then stat every file
listed).
FS.InlineBulkStatus can be considered a compound op with the normal abort
code applying to the compound as a whole. Each status fetch within the
compound is then given its own individual abort code - but assuming no
error that prevents the bulk fetch from returning the compound result will
be 0, even if all the constituent status fetches failed.
At the conclusion of afs_do_lookup(), we should use the abort code from the
appropriate status to determine the error to return, if any - but instead
it is assumed that we were successful if the op as a whole succeeded and we
return an incompletely initialised inode, resulting in ENOENT, no matter
the actual reason. In the particular instance reported, a vnode with no
permission granted to be accessed is being given a UAEACCES abort code
which should be reported as EACCES, but is instead being reported as
ENOENT.
Fix this by abandoning the inode (which will be cleaned up with the op) if
file[1] has an abort code indicated and turn that abort code into an error
instead.
Whilst we're at it, add a tracepoint so that the abort codes of the
individual subrequests of FS.InlineBulkStatus can be logged. At the moment
only the container abort code can be 0.
Fixes: e49c7b2f6d ("afs: Build an abstraction around an "operation" concept")
Reported-by: Jeffrey Altman <jaltman@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
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Merge tag 'vfs-6.8.netfs' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs
Pull netfs updates from Christian Brauner:
"This extends the netfs helper library that network filesystems can use
to replace their own implementations. Both afs and 9p are ported. cifs
is ready as well but the patches are way bigger and will be routed
separately once this is merged. That will remove lots of code as well.
The overal goal is to get high-level I/O and knowledge of the page
cache and ouf of the filesystem drivers. This includes knowledge about
the existence of pages and folios
The pull request converts afs and 9p. This removes about 800 lines of
code from afs and 300 from 9p. For 9p it is now possible to do writes
in larger than a page chunks. Additionally, multipage folio support
can be turned on for 9p. Separate patches exist for cifs removing
another 2000+ lines. I've included detailed information in the
individual pulls I took.
Summary:
- Add NFS-style (and Ceph-style) locking around DIO vs buffered I/O
calls to prevent these from happening at the same time.
- Support for direct and unbuffered I/O.
- Support for write-through caching in the page cache.
- O_*SYNC and RWF_*SYNC writes use write-through rather than writing
to the page cache and then flushing afterwards.
- Support for write-streaming.
- Support for write grouping.
- Skip reads for which the server could only return zeros or EOF.
- The fscache module is now part of the netfs library and the
corresponding maintainer entry is updated.
- Some helpers from the fscache subsystem are renamed to mark them as
belonging to the netfs library.
- Follow-up fixes for the netfs library.
- Follow-up fixes for the 9p conversion"
* tag 'vfs-6.8.netfs' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs: (50 commits)
netfs: Fix wrong #ifdef hiding wait
cachefiles: Fix signed/unsigned mixup
netfs: Fix the loop that unmarks folios after writing to the cache
netfs: Fix interaction between write-streaming and cachefiles culling
netfs: Count DIO writes
netfs: Mark netfs_unbuffered_write_iter_locked() static
netfs: Fix proc/fs/fscache symlink to point to "netfs" not "../netfs"
netfs: Rearrange netfs_io_subrequest to put request pointer first
9p: Use length of data written to the server in preference to error
9p: Do a couple of cleanups
9p: Fix initialisation of netfs_inode for 9p
cachefiles: Fix __cachefiles_prepare_write()
9p: Use netfslib read/write_iter
afs: Use the netfs write helpers
netfs: Export the netfs_sreq tracepoint
netfs: Optimise away reads above the point at which there can be no data
netfs: Implement a write-through caching option
netfs: Provide a launder_folio implementation
netfs: Provide a writepages implementation
netfs, cachefiles: Pass upper bound length to allow expansion
...
As 'needed' to trace_ext4_discard_preallocations is always 0 which
is meaningless. Just remove it.
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240105092102.496631-10-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
- Use memdup_array_user() to harden against overflow.
- Unconditionally advertise KVM_CAP_DEVICE_CTRL for all architectures.
- Clean up Kconfigs that all KVM architectures were selecting
- New functionality around "guest_memfd", a new userspace API that
creates an anonymous file and returns a file descriptor that refers
to it. guest_memfd files are bound to their owning virtual machine,
cannot be mapped, read, or written by userspace, and cannot be resized.
guest_memfd files do however support PUNCH_HOLE, which can be used to
switch a memory area between guest_memfd and regular anonymous memory.
- New ioctl KVM_SET_MEMORY_ATTRIBUTES allowing userspace to specify
per-page attributes for a given page of guest memory; right now the
only attribute is whether the guest expects to access memory via
guest_memfd or not, which in Confidential SVMs backed by SEV-SNP,
TDX or ARM64 pKVM is checked by firmware or hypervisor that guarantees
confidentiality (AMD PSP, Intel TDX module, or EL2 in the case of pKVM).
x86:
- Support for "software-protected VMs" that can use the new guest_memfd
and page attributes infrastructure. This is mostly useful for testing,
since there is no pKVM-like infrastructure to provide a meaningfully
reduced TCB.
- Fix a relatively benign off-by-one error when splitting huge pages during
CLEAR_DIRTY_LOG.
- Fix a bug where KVM could incorrectly test-and-clear dirty bits in non-leaf
TDP MMU SPTEs if a racing thread replaces a huge SPTE with a non-huge SPTE.
- Use more generic lockdep assertions in paths that don't actually care
about whether the caller is a reader or a writer.
- let Xen guests opt out of having PV clock reported as "based on a stable TSC",
because some of them don't expect the "TSC stable" bit (added to the pvclock
ABI by KVM, but never set by Xen) to be set.
- Revert a bogus, made-up nested SVM consistency check for TLB_CONTROL.
- Advertise flush-by-ASID support for nSVM unconditionally, as KVM always
flushes on nested transitions, i.e. always satisfies flush requests. This
allows running bleeding edge versions of VMware Workstation on top of KVM.
- Sanity check that the CPU supports flush-by-ASID when enabling SEV support.
- On AMD machines with vNMI, always rely on hardware instead of intercepting
IRET in some cases to detect unmasking of NMIs
- Support for virtualizing Linear Address Masking (LAM)
- Fix a variety of vPMU bugs where KVM fail to stop/reset counters and other state
prior to refreshing the vPMU model.
- Fix a double-overflow PMU bug by tracking emulated counter events using a
dedicated field instead of snapshotting the "previous" counter. If the
hardware PMC count triggers overflow that is recognized in the same VM-Exit
that KVM manually bumps an event count, KVM would pend PMIs for both the
hardware-triggered overflow and for KVM-triggered overflow.
- Turn off KVM_WERROR by default for all configs so that it's not
inadvertantly enabled by non-KVM developers, which can be problematic for
subsystems that require no regressions for W=1 builds.
- Advertise all of the host-supported CPUID bits that enumerate IA32_SPEC_CTRL
"features".
- Don't force a masterclock update when a vCPU synchronizes to the current TSC
generation, as updating the masterclock can cause kvmclock's time to "jump"
unexpectedly, e.g. when userspace hotplugs a pre-created vCPU.
- Use RIP-relative address to read kvm_rebooting in the VM-Enter fault paths,
partly as a super minor optimization, but mostly to make KVM play nice with
position independent executable builds.
- Guard KVM-on-HyperV's range-based TLB flush hooks with an #ifdef on
CONFIG_HYPERV as a minor optimization, and to self-document the code.
- Add CONFIG_KVM_HYPERV to allow disabling KVM support for HyperV "emulation"
at build time.
ARM64:
- LPA2 support, adding 52bit IPA/PA capability for 4kB and 16kB
base granule sizes. Branch shared with the arm64 tree.
- Large Fine-Grained Trap rework, bringing some sanity to the
feature, although there is more to come. This comes with
a prefix branch shared with the arm64 tree.
- Some additional Nested Virtualization groundwork, mostly
introducing the NV2 VNCR support and retargetting the NV
support to that version of the architecture.
- A small set of vgic fixes and associated cleanups.
Loongarch:
- Optimization for memslot hugepage checking
- Cleanup and fix some HW/SW timer issues
- Add LSX/LASX (128bit/256bit SIMD) support
RISC-V:
- KVM_GET_REG_LIST improvement for vector registers
- Generate ISA extension reg_list using macros in get-reg-list selftest
- Support for reporting steal time along with selftest
s390:
- Bugfixes
Selftests:
- Fix an annoying goof where the NX hugepage test prints out garbage
instead of the magic token needed to run the test.
- Fix build errors when a header is delete/moved due to a missing flag
in the Makefile.
- Detect if KVM bugged/killed a selftest's VM and print out a helpful
message instead of complaining that a random ioctl() failed.
- Annotate the guest printf/assert helpers with __printf(), and fix the
various bugs that were lurking due to lack of said annotation.
There are two non-KVM patches buried in the middle of guest_memfd support:
fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()
mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
The first is small and mostly suggested-by Christian Brauner; the second
a bit less so but it was written by an mm person (Vlastimil Babka).
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm updates from Paolo Bonzini:
"Generic:
- Use memdup_array_user() to harden against overflow.
- Unconditionally advertise KVM_CAP_DEVICE_CTRL for all
architectures.
- Clean up Kconfigs that all KVM architectures were selecting
- New functionality around "guest_memfd", a new userspace API that
creates an anonymous file and returns a file descriptor that refers
to it. guest_memfd files are bound to their owning virtual machine,
cannot be mapped, read, or written by userspace, and cannot be
resized. guest_memfd files do however support PUNCH_HOLE, which can
be used to switch a memory area between guest_memfd and regular
anonymous memory.
- New ioctl KVM_SET_MEMORY_ATTRIBUTES allowing userspace to specify
per-page attributes for a given page of guest memory; right now the
only attribute is whether the guest expects to access memory via
guest_memfd or not, which in Confidential SVMs backed by SEV-SNP,
TDX or ARM64 pKVM is checked by firmware or hypervisor that
guarantees confidentiality (AMD PSP, Intel TDX module, or EL2 in
the case of pKVM).
x86:
- Support for "software-protected VMs" that can use the new
guest_memfd and page attributes infrastructure. This is mostly
useful for testing, since there is no pKVM-like infrastructure to
provide a meaningfully reduced TCB.
- Fix a relatively benign off-by-one error when splitting huge pages
during CLEAR_DIRTY_LOG.
- Fix a bug where KVM could incorrectly test-and-clear dirty bits in
non-leaf TDP MMU SPTEs if a racing thread replaces a huge SPTE with
a non-huge SPTE.
- Use more generic lockdep assertions in paths that don't actually
care about whether the caller is a reader or a writer.
- let Xen guests opt out of having PV clock reported as "based on a
stable TSC", because some of them don't expect the "TSC stable" bit
(added to the pvclock ABI by KVM, but never set by Xen) to be set.
- Revert a bogus, made-up nested SVM consistency check for
TLB_CONTROL.
- Advertise flush-by-ASID support for nSVM unconditionally, as KVM
always flushes on nested transitions, i.e. always satisfies flush
requests. This allows running bleeding edge versions of VMware
Workstation on top of KVM.
- Sanity check that the CPU supports flush-by-ASID when enabling SEV
support.
- On AMD machines with vNMI, always rely on hardware instead of
intercepting IRET in some cases to detect unmasking of NMIs
- Support for virtualizing Linear Address Masking (LAM)
- Fix a variety of vPMU bugs where KVM fail to stop/reset counters
and other state prior to refreshing the vPMU model.
- Fix a double-overflow PMU bug by tracking emulated counter events
using a dedicated field instead of snapshotting the "previous"
counter. If the hardware PMC count triggers overflow that is
recognized in the same VM-Exit that KVM manually bumps an event
count, KVM would pend PMIs for both the hardware-triggered overflow
and for KVM-triggered overflow.
- Turn off KVM_WERROR by default for all configs so that it's not
inadvertantly enabled by non-KVM developers, which can be
problematic for subsystems that require no regressions for W=1
builds.
- Advertise all of the host-supported CPUID bits that enumerate
IA32_SPEC_CTRL "features".
- Don't force a masterclock update when a vCPU synchronizes to the
current TSC generation, as updating the masterclock can cause
kvmclock's time to "jump" unexpectedly, e.g. when userspace
hotplugs a pre-created vCPU.
- Use RIP-relative address to read kvm_rebooting in the VM-Enter
fault paths, partly as a super minor optimization, but mostly to
make KVM play nice with position independent executable builds.
- Guard KVM-on-HyperV's range-based TLB flush hooks with an #ifdef on
CONFIG_HYPERV as a minor optimization, and to self-document the
code.
- Add CONFIG_KVM_HYPERV to allow disabling KVM support for HyperV
"emulation" at build time.
ARM64:
- LPA2 support, adding 52bit IPA/PA capability for 4kB and 16kB base
granule sizes. Branch shared with the arm64 tree.
- Large Fine-Grained Trap rework, bringing some sanity to the
feature, although there is more to come. This comes with a prefix
branch shared with the arm64 tree.
- Some additional Nested Virtualization groundwork, mostly
introducing the NV2 VNCR support and retargetting the NV support to
that version of the architecture.
- A small set of vgic fixes and associated cleanups.
Loongarch:
- Optimization for memslot hugepage checking
- Cleanup and fix some HW/SW timer issues
- Add LSX/LASX (128bit/256bit SIMD) support
RISC-V:
- KVM_GET_REG_LIST improvement for vector registers
- Generate ISA extension reg_list using macros in get-reg-list
selftest
- Support for reporting steal time along with selftest
s390:
- Bugfixes
Selftests:
- Fix an annoying goof where the NX hugepage test prints out garbage
instead of the magic token needed to run the test.
- Fix build errors when a header is delete/moved due to a missing
flag in the Makefile.
- Detect if KVM bugged/killed a selftest's VM and print out a helpful
message instead of complaining that a random ioctl() failed.
- Annotate the guest printf/assert helpers with __printf(), and fix
the various bugs that were lurking due to lack of said annotation"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (185 commits)
x86/kvm: Do not try to disable kvmclock if it was not enabled
KVM: x86: add missing "depends on KVM"
KVM: fix direction of dependency on MMU notifiers
KVM: introduce CONFIG_KVM_COMMON
KVM: arm64: Add missing memory barriers when switching to pKVM's hyp pgd
KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache
RISC-V: KVM: selftests: Add get-reg-list test for STA registers
RISC-V: KVM: selftests: Add steal_time test support
RISC-V: KVM: selftests: Add guest_sbi_probe_extension
RISC-V: KVM: selftests: Move sbi_ecall to processor.c
RISC-V: KVM: Implement SBI STA extension
RISC-V: KVM: Add support for SBI STA registers
RISC-V: KVM: Add support for SBI extension registers
RISC-V: KVM: Add SBI STA info to vcpu_arch
RISC-V: KVM: Add steal-update vcpu request
RISC-V: KVM: Add SBI STA extension skeleton
RISC-V: paravirt: Implement steal-time support
RISC-V: Add SBI STA extension definitions
RISC-V: paravirt: Add skeleton for pv-time support
RISC-V: KVM: Fix indentation in kvm_riscv_vcpu_set_reg_csr()
...
In this series, we've some progress to support Zoned block device regarding to
the power-cut recovery flow and enabling checkpoint=disable feature which is
essential for Android OTA. Other than that, some patches touched sysfs entries
and tracepoints which are minor, while several bug fixes on error handlers and
compression flows are good to improve the overall stability.
Enhancement:
- enable checkpoint=disable for zoned block device
- sysfs entries such as discard status, discard_io_aware, dir_level
- tracepoints such as f2fs_vm_page_mkwrite(), f2fs_rename(), f2fs_new_inode()
- use shared inode lock during f2fs_fiemap() and f2fs_seek_block()
Bug fix:
- address some power-cut recovery issues on zoned block device
- handle errors and logics on do_garbage_collect(), f2fs_reserve_new_block(),
f2fs_move_file_range(), f2fs_recover_xattr_data()
- don't set FI_PREALLOCATED_ALL for partial write
- fix to update iostat correctly in f2fs_filemap_fault()
- fix to wait on block writeback for post_read case
- fix to tag gcing flag on page during block migration
- restrict max filesize for 16K f2fs
- fix to avoid dirent corruption
- explicitly null-terminate the xattr list
There are also several clean-up patches to remove dead codes and better
readability.
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Merge tag 'f2fs-for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
Pull f2fs update from Jaegeuk Kim:
"In this series, we've some progress to support Zoned block device
regarding to the power-cut recovery flow and enabling
checkpoint=disable feature which is essential for Android OTA.
Other than that, some patches touched sysfs entries and tracepoints
which are minor, while several bug fixes on error handlers and
compression flows are good to improve the overall stability.
Enhancements:
- enable checkpoint=disable for zoned block device
- sysfs entries such as discard status, discard_io_aware, dir_level
- tracepoints such as f2fs_vm_page_mkwrite(), f2fs_rename(),
f2fs_new_inode()
- use shared inode lock during f2fs_fiemap() and f2fs_seek_block()
Bug fixes:
- address some power-cut recovery issues on zoned block device
- handle errors and logics on do_garbage_collect(),
f2fs_reserve_new_block(), f2fs_move_file_range(),
f2fs_recover_xattr_data()
- don't set FI_PREALLOCATED_ALL for partial write
- fix to update iostat correctly in f2fs_filemap_fault()
- fix to wait on block writeback for post_read case
- fix to tag gcing flag on page during block migration
- restrict max filesize for 16K f2fs
- fix to avoid dirent corruption
- explicitly null-terminate the xattr list
There are also several clean-up patches to remove dead codes and
better readability"
* tag 'f2fs-for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (33 commits)
f2fs: show more discard status by sysfs
f2fs: Add error handling for negative returns from do_garbage_collect
f2fs: Constrain the modification range of dir_level in the sysfs
f2fs: Use wait_event_freezable_timeout() for freezable kthread
f2fs: fix to check return value of f2fs_recover_xattr_data
f2fs: don't set FI_PREALLOCATED_ALL for partial write
f2fs: fix to update iostat correctly in f2fs_filemap_fault()
f2fs: fix to check compress file in f2fs_move_file_range()
f2fs: fix to wait on block writeback for post_read case
f2fs: fix to tag gcing flag on page during block migration
f2fs: add tracepoint for f2fs_vm_page_mkwrite()
f2fs: introduce f2fs_invalidate_internal_cache() for cleanup
f2fs: update blkaddr in __set_data_blkaddr() for cleanup
f2fs: introduce get_dnode_addr() to clean up codes
f2fs: delete obsolete FI_DROP_CACHE
f2fs: delete obsolete FI_FIRST_BLOCK_WRITTEN
f2fs: Restrict max filesize for 16K f2fs
f2fs: let's finish or reset zones all the time
f2fs: check write pointers when checkpoint=disable
f2fs: fix write pointers on zoned device after roll forward
...
The bulk of the patches for this release are clean-ups and minor bug
fixes.
There is one significant revert to mention: support for RDMA Read
operations in the server's RPC-over-RDMA transport implementation
has been fixed so it waits for Read completion in a way that avoids
tying up an nfsd thread. This prevents a possible DoS vector if an
RPC-over-RDMA client should become unresponsive during RDMA Read
operations.
As always I am grateful to NFSD contributors, reviewers, and
testers.
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Merge tag 'nfsd-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd updates from Chuck Lever:
"The bulk of the patches for this release are clean-ups and minor bug
fixes.
There is one significant revert to mention: support for RDMA Read
operations in the server's RPC-over-RDMA transport implementation has
been fixed so it waits for Read completion in a way that avoids tying
up an nfsd thread. This prevents a possible DoS vector if an
RPC-over-RDMA client should become unresponsive during RDMA Read
operations.
As always I am grateful to NFSD contributors, reviewers, and testers"
* tag 'nfsd-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (56 commits)
nfsd: rename nfsd_last_thread() to nfsd_destroy_serv()
SUNRPC: discard sv_refcnt, and svc_get/svc_put
svc: don't hold reference for poolstats, only mutex.
SUNRPC: remove printk when back channel request not found
svcrdma: Implement multi-stage Read completion again
svcrdma: Copy construction of svc_rqst::rq_arg to rdma_read_complete()
svcrdma: Add back svcxprt_rdma::sc_read_complete_q
svcrdma: Add back svc_rdma_recv_ctxt::rc_pages
svcrdma: Clean up comment in svc_rdma_accept()
svcrdma: Remove queue-shortening warnings
svcrdma: Remove pointer addresses shown in dprintk()
svcrdma: Optimize svc_rdma_cc_init()
svcrdma: De-duplicate completion ID initialization helpers
svcrdma: Move the svc_rdma_cc_init() call
svcrdma: Remove struct svc_rdma_read_info
svcrdma: Update the synopsis of svc_rdma_read_special()
svcrdma: Update the synopsis of svc_rdma_read_call_chunk()
svcrdma: Update synopsis of svc_rdma_read_multiple_chunks()
svcrdma: Update synopsis of svc_rdma_copy_inline_range()
svcrdma: Update the synopsis of svc_rdma_read_data_item()
...
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Merge tag 'afs-fix-rotation-20240105' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull afs updates from David Howells:
"The majority of the patches are aimed at fixing and improving the AFS
filesystem's rotation over server IP addresses, but there are also
some fixes from Oleg Nesterov for the use of read_seqbegin_or_lock().
- Fix fileserver probe handling so that the next round of probes
doesn't break ongoing server/address rotation by clearing all the
probe result tracking. This could occasionally cause the rotation
algorithm to drop straight through, give a 'successful' result
without actually emitting any RPC calls, leaving the reply buffer
in an undefined state.
Instead, detach the probe results into a separate struct and
allocate a new one each time we start probing and update the
pointer to it. Probes are also sent in order of address preference
to try and improve the chance that the preferred one will complete
first.
- Fix server rotation so that it uses configurable address
preferences across on the probes that have completed so far than
ranking them by RTT as the latter doesn't necessarily give the best
route. The preference list can be altered by writing into
/proc/net/afs/addr_prefs.
- Fix the handling of Read-Only (and Backup) volume callbacks as
there is one per volume, not one per file, so if someone performs a
command that, say, offlines the volume but doesn't change it, when
it comes back online we don't spam the server with a status fetch
for every vnode we're using. Instead, check the Creation timestamp
in the VolSync record when prompted by a callback break.
- Handle volume regression (ie. a RW volume being restored from a
backup) by scrubbing all cache data for that volume. This is
detected from the VolSync creation timestamp.
- Adjust abort handling and abort -> error mapping to match better
with what other AFS clients do.
- Fix offline and busy volume state handling as they only apply to
individual server instances and not entire volumes and the rotation
algorithm should go and look at other servers if available. Also
make it sleep briefly before each retry if all the volume instances
are unavailable"
* tag 'afs-fix-rotation-20240105' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (40 commits)
afs: trace: Log afs_make_call(), including server address
afs: Fix offline and busy message emission
afs: Fix fileserver rotation
afs: Overhaul invalidation handling to better support RO volumes
afs: Parse the VolSync record in the reply of a number of RPC ops
afs: Don't leave DONTUSE/NEWREPSITE servers out of server list
afs: Fix comment in afs_do_lookup()
afs: Apply server breaks to mmap'd files in the call processor
afs: Move the vnode/volume validity checking code into its own file
afs: Defer volume record destruction to a workqueue
afs: Make it possible to find the volumes that are using a server
afs: Combine the endpoint state bools into a bitmask
afs: Keep a record of the current fileserver endpoint state
afs: Dispatch vlserver probes in priority order
afs: Dispatch fileserver probes in priority order
afs: Mark address lists with configured priorities
afs: Provide a way to configure address priorities
afs: Remove the unimplemented afs_cmp_addr_list()
afs: Add some more info to /proc/net/afs/servers
rxrpc: Create a procfile to display outstanding client conn bundles
...
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Merge tag 'for-6.8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"There are no exciting changes for users, it's been mostly API
conversions and some fixes or refactoring.
The mount API conversion is a base for future improvements that would
come with VFS. Metadata processing has been converted to folios, not
yet enabling the large folios but it's one patch away once everything
gets tested enough.
Core changes:
- convert extent buffers to folios:
- direct API conversion where possible
- performance can drop by a few percent on metadata heavy
workloads, the folio sizes are not constant and the calculations
add up in the item helpers
- both regular and subpage modes
- data cannot be converted yet, we need to port that to iomap and
there are some other generic changes required
- convert mount to the new API, should not be user visible:
- options deprecated long time ago have been removed: inode_cache,
recovery
- the new logic that splits mount to two phases slightly changes
timing of device scanning for multi-device filesystems
- LSM options will now work (like for selinux)
- convert delayed nodes radix tree to xarray, preserving the
preload-like logic that still allows to allocate with GFP_NOFS
- more validation of sysfs value of scrub_speed_max
- refactor chunk map structure, reduce size and improve performance
- extent map refactoring, smaller data structures, improved
performance
- reduce size of struct extent_io_tree, embedded in several
structures
- temporary pages used for compression are cached and attached to a
shrinker, this may slightly improve performance
- in zoned mode, remove redirty extent buffer tracking, zeros are
written in case an out-of-order is detected and proper data are
written to the actual write pointer
- cleanups, refactoring, error message improvements, updated tests
- verify and update branch name or tag
- remove unwanted text"
* tag 'for-6.8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (89 commits)
btrfs: pass btrfs_io_geometry into btrfs_max_io_len
btrfs: pass struct btrfs_io_geometry to set_io_stripe
btrfs: open code set_io_stripe for RAID56
btrfs: change block mapping to switch/case in btrfs_map_block
btrfs: factor out block mapping for single profiles
btrfs: factor out block mapping for RAID5/6
btrfs: reduce scope of data_stripes in btrfs_map_block
btrfs: factor out block mapping for RAID10
btrfs: factor out block mapping for DUP profiles
btrfs: factor out RAID1 block mapping
btrfs: factor out block-mapping for RAID0
btrfs: re-introduce struct btrfs_io_geometry
btrfs: factor out helper for single device IO check
btrfs: migrate btrfs_repair_io_failure() to folio interfaces
btrfs: migrate eb_bitmap_offset() to folio interfaces
btrfs: migrate various end io functions to folios
btrfs: migrate subpage code to folio interfaces
btrfs: migrate get_eb_page_index() and get_eb_offset_in_page() to folios
btrfs: don't double put our subpage reference in alloc_extent_buffer
btrfs: cleanup metadata page pointer usage
...
are included in this merge do the following:
- Peng Zhang has done some mapletree maintainance work in the
series
"maple_tree: add mt_free_one() and mt_attr() helpers"
"Some cleanups of maple tree"
- In the series "mm: use memmap_on_memory semantics for dax/kmem"
Vishal Verma has altered the interworking between memory-hotplug
and dax/kmem so that newly added 'device memory' can more easily
have its memmap placed within that newly added memory.
- Matthew Wilcox continues folio-related work (including a few
fixes) in the patch series
"Add folio_zero_tail() and folio_fill_tail()"
"Make folio_start_writeback return void"
"Fix fault handler's handling of poisoned tail pages"
"Convert aops->error_remove_page to ->error_remove_folio"
"Finish two folio conversions"
"More swap folio conversions"
- Kefeng Wang has also contributed folio-related work in the series
"mm: cleanup and use more folio in page fault"
- Jim Cromie has improved the kmemleak reporting output in the
series "tweak kmemleak report format".
- In the series "stackdepot: allow evicting stack traces" Andrey
Konovalov to permits clients (in this case KASAN) to cause
eviction of no longer needed stack traces.
- Charan Teja Kalla has fixed some accounting issues in the page
allocator's atomic reserve calculations in the series "mm:
page_alloc: fixes for high atomic reserve caluculations".
- Dmitry Rokosov has added to the samples/ dorectory some sample
code for a userspace memcg event listener application. See the
series "samples: introduce cgroup events listeners".
- Some mapletree maintanance work from Liam Howlett in the series
"maple_tree: iterator state changes".
- Nhat Pham has improved zswap's approach to writeback in the
series "workload-specific and memory pressure-driven zswap
writeback".
- DAMON/DAMOS feature and maintenance work from SeongJae Park in
the series
"mm/damon: let users feed and tame/auto-tune DAMOS"
"selftests/damon: add Python-written DAMON functionality tests"
"mm/damon: misc updates for 6.8"
- Yosry Ahmed has improved memcg's stats flushing in the series
"mm: memcg: subtree stats flushing and thresholds".
- In the series "Multi-size THP for anonymous memory" Ryan Roberts
has added a runtime opt-in feature to transparent hugepages which
improves performance by allocating larger chunks of memory during
anonymous page faults.
- Matthew Wilcox has also contributed some cleanup and maintenance
work against eh buffer_head code int he series "More buffer_head
cleanups".
- Suren Baghdasaryan has done work on Andrea Arcangeli's series
"userfaultfd move option". UFFDIO_MOVE permits userspace heap
compaction algorithms to move userspace's pages around rather than
UFFDIO_COPY'a alloc/copy/free.
- Stefan Roesch has developed a "KSM Advisor", in the series
"mm/ksm: Add ksm advisor". This is a governor which tunes KSM's
scanning aggressiveness in response to userspace's current needs.
- Chengming Zhou has optimized zswap's temporary working memory
use in the series "mm/zswap: dstmem reuse optimizations and
cleanups".
- Matthew Wilcox has performed some maintenance work on the
writeback code, both code and within filesystems. The series is
"Clean up the writeback paths".
- Andrey Konovalov has optimized KASAN's handling of alloc and
free stack traces for secondary-level allocators, in the series
"kasan: save mempool stack traces".
- Andrey also performed some KASAN maintenance work in the series
"kasan: assorted clean-ups".
- David Hildenbrand has gone to town on the rmap code. Cleanups,
more pte batching, folio conversions and more. See the series
"mm/rmap: interface overhaul".
- Kinsey Ho has contributed some maintenance work on the MGLRU
code in the series "mm/mglru: Kconfig cleanup".
- Matthew Wilcox has contributed lruvec page accounting code
cleanups in the series "Remove some lruvec page accounting
functions".
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Merge tag 'mm-stable-2024-01-08-15-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
"Many singleton patches against the MM code. The patch series which are
included in this merge do the following:
- Peng Zhang has done some mapletree maintainance work in the series
'maple_tree: add mt_free_one() and mt_attr() helpers'
'Some cleanups of maple tree'
- In the series 'mm: use memmap_on_memory semantics for dax/kmem'
Vishal Verma has altered the interworking between memory-hotplug
and dax/kmem so that newly added 'device memory' can more easily
have its memmap placed within that newly added memory.
- Matthew Wilcox continues folio-related work (including a few fixes)
in the patch series
'Add folio_zero_tail() and folio_fill_tail()'
'Make folio_start_writeback return void'
'Fix fault handler's handling of poisoned tail pages'
'Convert aops->error_remove_page to ->error_remove_folio'
'Finish two folio conversions'
'More swap folio conversions'
- Kefeng Wang has also contributed folio-related work in the series
'mm: cleanup and use more folio in page fault'
- Jim Cromie has improved the kmemleak reporting output in the series
'tweak kmemleak report format'.
- In the series 'stackdepot: allow evicting stack traces' Andrey
Konovalov to permits clients (in this case KASAN) to cause eviction
of no longer needed stack traces.
- Charan Teja Kalla has fixed some accounting issues in the page
allocator's atomic reserve calculations in the series 'mm:
page_alloc: fixes for high atomic reserve caluculations'.
- Dmitry Rokosov has added to the samples/ dorectory some sample code
for a userspace memcg event listener application. See the series
'samples: introduce cgroup events listeners'.
- Some mapletree maintanance work from Liam Howlett in the series
'maple_tree: iterator state changes'.
- Nhat Pham has improved zswap's approach to writeback in the series
'workload-specific and memory pressure-driven zswap writeback'.
- DAMON/DAMOS feature and maintenance work from SeongJae Park in the
series
'mm/damon: let users feed and tame/auto-tune DAMOS'
'selftests/damon: add Python-written DAMON functionality tests'
'mm/damon: misc updates for 6.8'
- Yosry Ahmed has improved memcg's stats flushing in the series 'mm:
memcg: subtree stats flushing and thresholds'.
- In the series 'Multi-size THP for anonymous memory' Ryan Roberts
has added a runtime opt-in feature to transparent hugepages which
improves performance by allocating larger chunks of memory during
anonymous page faults.
- Matthew Wilcox has also contributed some cleanup and maintenance
work against eh buffer_head code int he series 'More buffer_head
cleanups'.
- Suren Baghdasaryan has done work on Andrea Arcangeli's series
'userfaultfd move option'. UFFDIO_MOVE permits userspace heap
compaction algorithms to move userspace's pages around rather than
UFFDIO_COPY'a alloc/copy/free.
- Stefan Roesch has developed a 'KSM Advisor', in the series 'mm/ksm:
Add ksm advisor'. This is a governor which tunes KSM's scanning
aggressiveness in response to userspace's current needs.
- Chengming Zhou has optimized zswap's temporary working memory use
in the series 'mm/zswap: dstmem reuse optimizations and cleanups'.
- Matthew Wilcox has performed some maintenance work on the writeback
code, both code and within filesystems. The series is 'Clean up the
writeback paths'.
- Andrey Konovalov has optimized KASAN's handling of alloc and free
stack traces for secondary-level allocators, in the series 'kasan:
save mempool stack traces'.
- Andrey also performed some KASAN maintenance work in the series
'kasan: assorted clean-ups'.
- David Hildenbrand has gone to town on the rmap code. Cleanups, more
pte batching, folio conversions and more. See the series 'mm/rmap:
interface overhaul'.
- Kinsey Ho has contributed some maintenance work on the MGLRU code
in the series 'mm/mglru: Kconfig cleanup'.
- Matthew Wilcox has contributed lruvec page accounting code cleanups
in the series 'Remove some lruvec page accounting functions'"
* tag 'mm-stable-2024-01-08-15-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (361 commits)
mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER
mm, treewide: introduce NR_PAGE_ORDERS
selftests/mm: add separate UFFDIO_MOVE test for PMD splitting
selftests/mm: skip test if application doesn't has root privileges
selftests/mm: conform test to TAP format output
selftests: mm: hugepage-mmap: conform to TAP format output
selftests/mm: gup_test: conform test to TAP format output
mm/selftests: hugepage-mremap: conform test to TAP format output
mm/vmstat: move pgdemote_* out of CONFIG_NUMA_BALANCING
mm: zsmalloc: return -ENOSPC rather than -EINVAL in zs_malloc while size is too large
mm/memcontrol: remove __mod_lruvec_page_state()
mm/khugepaged: use a folio more in collapse_file()
slub: use a folio in __kmalloc_large_node
slub: use folio APIs in free_large_kmalloc()
slub: use alloc_pages_node() in alloc_slab_page()
mm: remove inc/dec lruvec page state functions
mm: ratelimit stat flush from workingset shrinker
kasan: stop leaking stack trace handles
mm/mglru: remove CONFIG_TRANSPARENT_HUGEPAGE
mm/mglru: add dummy pmd_dirty()
...
- Energy scheduling:
- Consolidate how the max compute capacity is
used in the scheduler and how we calculate
the frequency for a level of utilization.
- Rework interface between the scheduler and
the schedutil governor
- Simplify the util_est logic
- Deadline scheduler:
- Work more towards reducing SCHED_DEADLINE
starvation of low priority tasks (e.g., SCHED_OTHER)
tasks when higher priority tasks monopolize CPU
cycles, via the introduction of 'deadline servers'
(nested/2-level scheduling).
"Fair servers" to make use of this facility are
not introduced yet.
- EEVDF:
- Introduce O(1) fastpath for EEVDF task selection
- NUMA balancing:
- Tune the NUMA-balancing vma scanning logic some more,
to better distribute the probability
of a particular vma getting scanned.
- Plus misc fixes, cleanups and updates.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar:
"Energy scheduling:
- Consolidate how the max compute capacity is used in the scheduler
and how we calculate the frequency for a level of utilization.
- Rework interface between the scheduler and the schedutil governor
- Simplify the util_est logic
Deadline scheduler:
- Work more towards reducing SCHED_DEADLINE starvation of low
priority tasks (e.g., SCHED_OTHER) tasks when higher priority tasks
monopolize CPU cycles, via the introduction of 'deadline servers'
(nested/2-level scheduling).
"Fair servers" to make use of this facility are not introduced yet.
EEVDF:
- Introduce O(1) fastpath for EEVDF task selection
NUMA balancing:
- Tune the NUMA-balancing vma scanning logic some more, to better
distribute the probability of a particular vma getting scanned.
Plus misc fixes, cleanups and updates"
* tag 'sched-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
sched/fair: Fix tg->load when offlining a CPU
sched/fair: Remove unused 'next_buddy_marked' local variable in check_preempt_wakeup_fair()
sched/fair: Use all little CPUs for CPU-bound workloads
sched/fair: Simplify util_est
sched/fair: Remove SCHED_FEAT(UTIL_EST_FASTUP, true)
arm64/amu: Use capacity_ref_freq() to set AMU ratio
cpufreq/cppc: Set the frequency used for computing the capacity
cpufreq/cppc: Move and rename cppc_cpufreq_{perf_to_khz|khz_to_perf}()
energy_model: Use a fixed reference frequency
cpufreq/schedutil: Use a fixed reference frequency
cpufreq: Use the fixed and coherent frequency for scaling capacity
sched/topology: Add a new arch_scale_freq_ref() method
freezer,sched: Clean saved_state when restoring it during thaw
sched/fair: Update min_vruntime for reweight_entity() correctly
sched/doc: Update documentation after renames and synchronize Chinese version
sched/cpufreq: Rework iowait boost
sched/cpufreq: Rework schedutil governor performance estimation
sched/pelt: Avoid underestimation of task utilization
sched/timers: Explain why idle task schedules out on remote timer enqueue
sched/cpuidle: Comment about timers requirements VS idle handler
...
- Various preparatory cleanups & enhancements of the timer-wheel code,
in preparation for the WIP 'pull timers at expiry' timer migration model
series (which will replace the current 'push timers at enqueue' migration
model), by Anna-Maria Behnsen:
- Update comments and clean up confusing variable names
- Add debug check to warn about time travel
- Improve/expand timer-wheel tracepoints
- Optimize away unnecessary IPIs for deferrable timers
- Restructure & clean up next_expiry_recalc()
- Clean up forward_timer_base()
- Introduce __forward_timer_base() and use it to simplify
and micro-optimize get_next_timer_interrupt()
- Restructure the get_next_timer_interrupt()'s idle logic
for better readability and to enable a minor optimization.
- Fix the nextevt calculation when no timers are pending
- Fix the sysfs_get_uname() prototype declaration
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'timers-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer subsystem updates from Ingo Molnar:
- Various preparatory cleanups & enhancements of the timer-wheel code,
in preparation for the WIP 'pull timers at expiry' timer migration
model series (which will replace the current 'push timers at enqueue'
migration model), by Anna-Maria Behnsen:
- Update comments and clean up confusing variable names
- Add debug check to warn about time travel
- Improve/expand timer-wheel tracepoints
- Optimize away unnecessary IPIs for deferrable timers
- Restructure & clean up next_expiry_recalc()
- Clean up forward_timer_base()
- Introduce __forward_timer_base() and use it to simplify and
micro-optimize get_next_timer_interrupt()
- Restructure the get_next_timer_interrupt()'s idle logic for better
readability and to enable a minor optimization.
- Fix the nextevt calculation when no timers are pending
- Fix the sysfs_get_uname() prototype declaration
* tag 'timers-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
timers: Fix nextevt calculation when no timers are pending
timers: Rework idle logic
timers: Use already existing function for forwarding timer base
timers: Split out forward timer base functionality
timers: Clarify check in forward_timer_base()
timers: Move store of next event into __next_timer_interrupt()
timers: Do not IPI for deferrable timers
tracing/timers: Add tracepoint for tracking timer base is_idle flag
tracing/timers: Enhance timer_start tracepoint
tick-sched: Warn when next tick seems to be in the past
tick/sched: Cleanup confusing variables
tick-sched: Fix function names in comments
time: Make sysfs_get_uname() function visible in header
Once a set of RDMA Reads are complete, the Read completion handler
will poke the transport to trigger a second call to
svc_rdma_recvfrom(). recvfrom() will then merge the RDMA Read
payloads with the previously received RPC header to form a completed
RPC Call message.
The new code is copied from the svc_rdma_process_read_list() path.
A subsequent patch will make use of this code and remove the code
that this was copied from (svc_rdma_rw.c).
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
A send/recv_ctxt already records transport-related information
in the cq.id, thus there is no need to record the IP addresses of
the transport endpoints.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Update the DMA error flow tracepoints to report the completion ID of
the failing context. This ties the wait/failure to a particular
operation or request, which is more useful than knowing only the
failing transport.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Update the Send Queue's error flow tracepoints to report the
completion ID of the waiting or failing context. This ties the
wait/failure to a particular operation or request, which is a little
more useful than knowing only the transport that is about to close.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
- KVM_GET_REG_LIST improvement for vector registers
- Generate ISA extension reg_list using macros in get-reg-list selftest
- Steal time account support along with selftest
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Merge tag 'kvm-riscv-6.8-1' of https://github.com/kvm-riscv/linux into HEAD
KVM/riscv changes for 6.8 part #1
- KVM_GET_REG_LIST improvement for vector registers
- Generate ISA extension reg_list using macros in get-reg-list selftest
- Steal time account support along with selftest
Add a tracepoint to log calls to afs_make_call(), including the destination
server address.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Fix the fileserver rotation so that it doesn't use RTT as the basis for
deciding which server and address to use as this doesn't necessarily give a
good indication of the best path. Instead, use the configurable preference
list in conjunction with whatever probes have succeeded at the time of
looking.
To this end, make the following changes:
(1) Keep an array of "server states" to track what addresses we've tried
on each server and move the waitqueue entries there that we'll need
for probing.
(2) Each afs_server_state struct is made to pin the corresponding server's
endpoint state rather than the afs_operation struct carrying a pin on
the server we're currently looking at.
(3) Drop the server list preference; we now always rescan the server list.
(4) afs_wait_for_probes() now uses the server state list to guide it in
what it waits for (and to provide the waitqueue entries) and returns
an indication of whether we'd got a response, run out of responsive
addresses or the endpoint state had been superseded and we need to
restart the iteration.
(5) Call afs_get_address_preferences*() occasionally to refresh the
preference values.
(6) When picking a server, scan the addresses of the servers for which we
have as-yet untested communications, looking for the highest priority
one and use that instead of trying all the addresses for a particular
server in ascending-RTT order.
(7) When a Busy or Offline state is seen across all available servers, do
a short sleep.
(8) If we detect that we accessed a future RO volume version whilst it is
undergoing replication, reissue the op against the older version until
at least half of the servers are replicated.
(9) Whilst RO replication is ongoing, increase the frequency of Volume
Location server checks for that volume to every ten minutes instead of
hourly.
Also add a tracepoint to track progress through the rotation algorithm.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Overhaul the third party-induced invalidation handling, making use of the
previously added volume-level event counters (cb_scrub and cb_ro_snapshot)
that are now being parsed out of the VolSync record returned by the
fileserver in many of its replies.
This allows better handling of RO (and Backup) volumes. Since these are
snapshot of a RW volume that are updated atomically simultantanously across
all servers that host them, they only require a single callback promise for
the entire volume. The currently upstream code assumes that RO volumes
operate in the same manner as RW volumes, and that each file has its own
individual callback - which means that it does a status fetch for *every*
file in a RO volume, whether or not the volume got "released" (volume
callback breaks can occur for other reasons too, such as the volumeserver
taking ownership of a volume from a fileserver).
To this end, make the following changes:
(1) Change the meaning of the volume's cb_v_break counter so that it is
now a hint that we need to issue a status fetch to work out the state
of a volume. cb_v_break is incremented by volume break callbacks and
by server initialisation callbacks.
(2) Add a second counter, cb_v_check, to the afs_volume struct such that
if this differs from cb_v_break, we need to do a check. When the
check is complete, cb_v_check is advanced to what cb_v_break was at
the start of the status fetch.
(3) Move the list of mmap'd vnodes to the volume and trigger removal of
PTEs that map to files on a volume break rather than on a server
break.
(4) When a server reinitialisation callback comes in, use the
server-to-volume reverse mapping added in a preceding patch to iterate
over all the volumes using that server and clear the volume callback
promises for that server and the general volume promise as a whole to
trigger reanalysis.
(5) Replace the AFS_VNODE_CB_PROMISED flag with an AFS_NO_CB_PROMISE
(TIME64_MIN) value in the cb_expires_at field, reducing the number of
checks we need to make.
(6) Change afs_check_validity() to quickly see if various event counters
have been incremented or if the vnode or volume callback promise is
due to expire/has expired without making any changes to the state.
That is now left to afs_validate() as this may get more complicated in
future as we may have to examine server records too.
(7) Overhaul afs_validate() so that it does a single status fetch if we
need to check the state of either the vnode or the volume - and do so
under appropriate locking. The function does the following steps:
(A) If the vnode/volume is no longer seen as valid, then we take the
vnode validation lock and, if the volume promise has expired, the
volume check lock also. The latter prevents redundant checks being
made to find out if a new version of the volume got released.
(B) If a previous RPC call found that the volsync changed unexpectedly
or that a RO volume was updated, then we unmap all PTEs pointing to
the file to stop mmap being used for access.
(C) If the vnode is still seen to be of uncertain validity, then we
perform an FS.FetchStatus RPC op to jointly update the volume status
and the vnode status. This assessment is done as part of parsing the
reply:
If the RO volume creation timestamp advances, cb_ro_snapshot is
incremented; if either the creation or update timestamps changes in
an unexpected way, the cb_scrub counter is incremented
If the Data Version returned doesn't match the copy we have
locally, then we ask for the pagecache to be zapped. This takes
care of handling RO update.
(D) If cb_scrub differs between volume and vnode, the vnode's
pagecache is zapped and the vnode's cb_scrub is updated unless the
file is marked as having been deleted.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
A number of fileserver RPC operations return a VolSync record as part of
their reply that gives some information about the state of the volume being
accessed, including:
(1) A volume Creation timestamp. For an RW volume, this is the time at
which the volume was created; if it changes, the RW volume was
presumably restored from a backup and all cached data should be
scrubbed as Data Version numbers could regress on the files in the
volume.
For an RO volume, this is the time it was last snapshotted from the RW
volume. It is expected to advance each time this happens; if it
regresses, cached data should be scrubbed.
(2) A volume Update timestamp (Auristor only). For an RW volume, this is
updated any time any change is made to a volume or its contents. If
it regresses, all cached data must be scrubbed.
For an RO volume, this is a copy of the RW volume's Update timestamp
at the point of snapshotting. It can be used as a version number when
checking to see if a callback on a RO volume was due to a snapshot.
If it regresses, all cached data must be scrubbed.
but this is currently not made use of by the in-kernel afs filesystem.
Make the afs filesystem use this by:
(1) Add an update time field to the afs_volsync struct and use a value of
TIME64_MIN in both that and the creation time to indicate that they
are unset.
(2) Add creation and update time fields to the afs_volume struct and use
this to track the two timestamps.
(3) Add a volsync_lock mutex to the afs_volume struct to control
modification access for when we detect a change in these values.
(3) Add a 'pre-op volsync' struct to the afs_operation struct to record
the state of the volume tracking before the op.
(4) Add a new counter, cb_scrub, to the afs_volume struct to count events
that require all data to be scrubbed. A copy is placed in the
afs_vnode struct (inode) and if they no longer match, a scrub takes
place.
(5) When the result of an operation is being parsed, parse the VolSync
data too, if it is provided. Note that the two timestamps are handled
separately, since they don't work in quite the same way.
- If the afs_volume tracking is unset, just set it and do nothing
else.
- If the result timestamps are the same as the ones in afs_volume, do
nothing.
- If the timestamps regress, increment cb_scrub if not already done
so.
- If the creation timestamp on a RW volume changes, increment cb_scrub
if not already done so.
- If the creation timestamp on a RO volume advances, update the server
list and see if the current server has been excluded, if so reissue
the op. Once over half of the replication sites have been updated,
increment cb_ro_snapshot to indicate updates may be required and
switch over to excluding unupdated replication sites.
- If the creation timestamp on a Backup volume advances, just
increment cb_ro_snapshot to trigger updates.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Apply server breaks to mmap'd files that are being used from that server
from the call processor work function rather than punting it off to a
workqueue. The work item, afs_server_init_callback(), then bumps each
individual inode off to its own work item introducing a potentially lengthy
delay. This reduces that delay at the cost of extending the amount of time
we delay replying to the CB.InitCallBack3 notification RPC from the server.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Keep a record of the current fileserver endpoint state, including the probe
state, and replace it when a new probe is started rather than just
squelching the old state and overwriting it. Clearance of the old state
can cause a race if there's another thread also currently trying to
communicate with that server.
It appears that this race might be the culprit for some occasions where
kafs complains about invalid data in the RPC reply because the rotation
algorithm fell all the way through without actually issuing an RPC call and
the error return got filled in from the probe state (which has a zero error
recorded). Whatever happens to be in the caller's reply buffer is then
taken as the response.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
When probing all the addresses for a volume location server, dispatch them
in order of descending priority to try and get back highest priority one
first.
Also add a tracepoint to show the transmission and completion of the
probes.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
When probing all the addresses for a fileserver, dispatch them in order of
descending priority to try and get back highest priority one first.
Also add a tracepoint to show the transmission and completion of the
probes.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
This adds a new tracepoint for the ksm advisor. It reports the last scan
time, the new setting of the pages_to_scan parameter and the average cpu
percent usage of the ksmd background thread for the last scan.
Link: https://lkml.kernel.org/r/20231218231054.1625219-4-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Provide a flag whereby a filesystem may request that cifs_perform_write()
perform write-through caching. This involves putting pages directly into
writeback rather than dirty and attaching them to a write operation as we
go.
Further, the writes being made are limited to the byte range being written
rather than whole folios being written. This can be used by cifs, for
example, to deal with strict byte-range locking.
This can't be used with content encryption as that may require expansion of
the write RPC beyond the write being made.
This doesn't affect writes via mmap - those are written back in the normal
way; similarly failed writethrough writes are marked dirty and left to
writeback to retry. Another option would be to simply invalidate them, but
the contents can be simultaneously accessed by read() and through mmap.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Implement support for unbuffered writes and direct I/O writes. If the
write is misaligned with respect to the fscrypt block size, then RMW cycles
are performed if necessary. DIO writes are a special case of unbuffered
writes with extra restriction imposed, such as block size alignment
requirements.
Also provide a field that can tell the code to add some extra space onto
the bounce buffer for use by the filesystem in the case of a
content-encrypted file.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Implement support for unbuffered and DIO reads in the netfs library,
utilising the existing read helper code to do block splitting and
individual queuing. The code also handles extraction of the destination
buffer from the supplied iterator, allowing async unbuffered reads to take
place.
The read will be split up according to the rsize setting and, if supplied,
the ->clamp_length() method. Note that the next subrequest will be issued
as soon as issue_op returns, without waiting for previous ones to finish.
The network filesystem needs to pause or handle queuing them if it doesn't
want to fire them all at the server simultaneously.
Once all the subrequests have finished, the state will be assessed and the
amount of data to be indicated as having being obtained will be
determined. As the subrequests may finish in any order, if an intermediate
subrequest is short, any further subrequests may be copied into the buffer
and then abandoned.
In the future, this will also take care of doing an unbuffered read from
encrypted content, with the decryption being done by the library.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
netfs_read_folio() needs to handle partially-valid pages that are marked
dirty, but not uptodate in the event that someone tries to read a page was
used to cache data by a streaming write.
In such a case, make netfs_read_folio() set up a bvec iterator that points
to the parts of the folio that need filling and to a sink page for the data
that should be discarded and use that instead of i_pages as the iterator to
be written to.
This requires netfs_rreq_unlock_folios() to convert the page into a normal
dirty uptodate page, getting rid of the partial write record and bumping
the group pointer over to folio->private.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Provide a netfs write helper, netfs_perform_write() to buffer data to be
written in the pagecache and mark the modified folios dirty.
It will perform "streaming writes" for folios that aren't currently
resident, if possible, storing data in partially modified folios that are
marked dirty, but not uptodate. It will also tag pages as belonging to
fs-specific write groups if so directed by the filesystem.
This is derived from generic_perform_write(), but doesn't use
->write_begin() and ->write_end(), having that logic rolled in instead.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Jakub Kicinski