CID 1404532 fixes a signed vs unsigned comparison error in fuse_vnop_bmap.
It could potentially have resulted in VOP_BMAP reporting too many
consecutive blocks.
CID 1404364 is much worse. It was an array access by an untrusted,
user-provided variable. It could potentially have resulted in a malicious
file system crashing the kernel or worse.
Reported by: Coverity
Reviewed by: emaste
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21466
to add BBR. These changes make it so you can get an
array of timestamps instead of a compressed ack/data segment.
BBR uses this to aid with its delivery estimates. We also
now (via Drew's suggestions) will not go to the expense of
the tcb lookup if no stack registers to want this feature. If
HPTS is not present the feature is not present either and you
just get the compressed behavior.
Sponsored by: Netflix Inc
Differential Revision: https://reviews.freebsd.org/D21127
We only call alloc_pvo_entry() with M_WAITOK from one location. However,
this can be called while holding nonsleepable locks. Rather than passing
M_WAITOK down, use vm_wait() and loop.
Summary:
MOEA64_PTE_REPLACE() is called often with the pmap lock held, and
sometimes with the page pv lock held. The less work done while holding
a lock, the better. Since we are intending to replace the same PTE
(same hash index), we don't need to recalculate anything, just flat
replace the PTE. This cuts more than 200 instructions off the
invalidating code path. In addition, we don't need to replace a PTE
that's not occupied by this PVO.
Reviewed by: luporl
Differential Revision: https://reviews.freebsd.org/D21515
The "nd" argument for nfsrv_proxyds() is no longer used by the function.
This patch deletes it. This allows a subsequent patch to delete the "nd"
argument from nfsvno_getattr(), since it's only use of "nd" was to pass it
to nfsrv_proxyds().
Getting rid of the "nd" argument from nfsvno_getattr() avoids confusion
over why it might need "nd".
This patch is trivial and does not have any semantic effect.
These were fully neutered in r177676 (2008), but not removed at the time for
unclear reasons. They're totally dead code, so go ahead and yank them now.
No functional change.
After r294954, it is an invariant that bread returns non-NULL bp if and only
if the routine succeeded. On error, it handles any buffer cleanup
internally. So the brelse(NULL) here was just redundant.
No functional change.
Discussed with: kib (extracted from a larger differential)
The iicdev_writeto() function basically does scatter-gather IO by filling
in a pair of iic_msg structs to write the register address then the data
from different locations but with a single bus START/xfer/STOP sequence.
It turns out several low-level i2c controller drivers do not honor the
IIC_NOSTART flag, so the second piece of the write gets a new START on
the bus, and that confuses the ads111x chips which expect a continuous
write of 3 bytes to set a register.
A proper fix for this is to track down all the misbehaving controllers
drivers and fix them. For now this change makes this driver work again.
Also, disable the comparator by default; it's not used for anything.
The previous logic would start a measurement, and then pause_sbt() for the
averaging time currently configured in the chip. After waiting that long,
the code would blindly read the measurement register and return its value.
The problem is that the chip's idea of averaging time is based on its
internal free-running 1MHz oscillator, which may be running at a wildly
different rate than the kernel clock. If the chip's internal timer was
running slower than the kernel clock, we'd end up grabbing a stale result
from an old measurement.
The driver now still uses pause_sbt() to yield the cpu while waiting for
the measurement to complete, but after sleeping it checks the chip's status
register to ensure the measurement engine is idle. If it's not, the driver
uses a retry loop to wait a bit (5% of the original wait time) then check
again for completion.
There are 2 problems:
- it introduces a funny bug where it can end up trylocking the same vnode [1]
- it exposes a pre-existing softdep deadlock [2]
Both are easier to run into that the bug which got fixed, so revert until
a complete solution is worked out.
Reported by: cy [1], pho [2]
Sponsored by: The FreeBSD Foundation
The "nd" argument for nfsrv_checkdsattr() is no longer used by the function.
This patch deletes it. This allows subsequent patches to delete the "nd"
argument from nfsrv_proxyds(), since it's only use of "nd" was to pass it
to nfsrv_checkdsattr(). The same will then be true for nfsvno_getattr(),
which passes "nd" to nfsrv_proxyds().
Getting rid of the "nd" argument from nfsvno_getattr() avoids confusion
over why it might need "nd".
This patch is trivial and does not have any semantic effect.
Found by inspection while working on the NFSv4.2 server.
Don't free pages in a shadowing object. While this degrades MADV_FREE
to a no-op (and we could, instead, choose to fall back to
MADV_DONTNEED, at the cost of changing pmap_madvise), this is
presently considered a temporary fix. We may prefer to risk a little
fragmentation of the map by creating a zero/OBJT_DEFAULT entry over
top of the existing object and, simultaneously, revert to the existing
marking any pages in the former shadowing object in the advised region
as reclaimable. At least one consumer of MADV_FREE (snmalloc) may use
mmap() to construct zeroed pages "eventually" here anyway, so the
fragmentation may be coming anyway.
Submitted by: Nathaniel Filardo <nwf20@cl.cam.ac.uk>
PR: 240061
Reviewed by: markj
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D21517
The NVMe standard (1.4) states
>>> 8.6 Doorbell Stride for Software Emulation
>>> The doorbell stride,...is useful in software emulation of an NVM
>>> Express controller. ... For hardware implementations of the NVM
>>> Express interface, the expected doorbell stride value is 0h.
However, hardware in the wild exists with a doorbell stride of 1
(meaning 8 byte separation). This change supports that hardware, as
well as software emulators as envisioned in Section 8.6. Since this is
the fast path, care has been taken to make this computation
efficient. The bit of math to compute an offset for each is replaced
by a memory load from cache of a pre-computed value.
MFC After: 3 days
Reviewed by: scottl@
Differential Revision: https://reviews.freebsd.org/D21514
Currently the code only bumps holdcnt and clears the VI_FREE flag, not
performing actual vhold. Since the vnode is still visible elsewhere, a
potential new user can find it and incorrectly assume it is properly held.
Use vholdl instead to correctly hold the vnode. Another place recycling
(vlrureclaim) does this already.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21522
Specifically, the following was broken:
$ mount -t procfs procfs /proc
$ ls -l /proc
r351741 reworked readdir slightly to avoid pfs_node/pidhash LOR, but
inadvertently regressed pid == NO_PID; new pfs_lookup_proc() fails for the
obvious reasons, and later pfs_visible_proc doesn't capture the
pid == NO_PID -> return 1 aspect of pfs_visible. We can infact skip this
whole block if we're operating on a directory w/ NO_PID, as it's always
visible.
Reported by: trasz
Reviewed by: mjg
Differential Revision: https://reviews.freebsd.org/D21518
This fixes a hole in the situation where the resume state is left from
receiving a new dataset and, so, the state is set on the dataset itself
(as opposed to %recv child).
Additionally, distinguish incremental and resume streams in error
messages.
This was also committed to ZoL:
zfsonlinux/zfs@ebeb6f23bf
MFC after: 2 weeks
Sponsored by: CyberSecure
- Use ptoa() instead of the archaic ctob().
- Use pagezero() to zero a PDP page.
- Remove PA_MIN_ADDRESS, orphaned by r351742.
- Remove unneeded parens and an unnecessary control flow statement.
Reported by: alc
Reviewed by: alc, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21495
Currently LOCAL_MODULES= works, but LOCAL_MODULES="" causes build errors as
.for still has the empty string to loop over. An .if empty prior to the loop
was considered, but LOCAL_MODULES has empty quotes at that point and thus,
isn't empty. A better solution likely exists, but this floats us by for
now...
GEOM is supposed to be topology-agnostic, but the GPT and BSD partition code
has arbitrary restrictions on nesting that are annoying in cases such as
running VMs on raw partitions (since the VM's partitioning scheme is not
visible to the host).
This patch adds sysctls to disable the restrictions except in the case of
BSD label (and similar) partitions with offset 0 (where we need to avoid
recursively recognizing the label).
Submitted by: Andrew Gierth
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D21350
r351650 switched posixshm to using OBJT_SWAP for shm_object
r351795 added support to the swap_pager for tracking writeable mappings
Take advantage of this and start tracking writeable mappings; fd sealing
will use this to reject a seal on writing with EBUSY if any such mapping
exist.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D21456
Currently writemapping accounting is only done for vnode_pager which does
some accounting on the underlying vnode.
Extend this to allow accounting to be possible for any of the pager types.
New pageops are added to update/release writecount that need to be
implemented for any pager wishing to do said accounting, and we implement
these methods now for both vnode_pager (unchanged) and swap_pager.
The primary motivation for this is to allow other systems with OBJT_SWAP
objects to check if their objects have any write mappings and reject
operations with EBUSY if so. posixshm will be the first to do so in order to
reject adding write seals to the shmfd if any writable mappings exist.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D21456
from recent Ubuntu versions. Without it they segfault on startup.
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20687
* Convert the TCP delayed ACK timer from ms to ticks as required.
This fixes the timer on platforms with hz != 1000.
* Don't delay acknowledgements which report duplicate data using
DSACKs.
Reviewed by: rrs@
MFC after: 1 week
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D21512
It allows a process to request that stack gap was not applied to its
stacks, retroactively. Also it is possible to control the gaps in the
process after exec.
PR: 239894
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D21352
