Leaving zeroing to the clients leads to error-prone pointer
tricks (zeroing needs to preserve the CCB header), and this
code is not performance-critical, so there's really no reason
to not do it.
Reviewed By: imp, rpokala (manpages)
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27333
Before r332974 the old code would sometimes cause a rare lock order
reversal against pagequeue, which looked roughly like this:
witness_checkorder()
__mtx_lock-flags()
vm_page_alloc()
uma_small_alloc()
keg_alloc_slab()
keg_fetch-slab()
zone_fetch-slab()
zone_import()
zone_alloc_bucket()
uma_zalloc_arg()
bucket_alloc()
uma_zfree_arg()
free()
devfs_metoo()
devfs_populate_loop()
devfs_populate()
devfs_rioctl()
VOP_IOCTL_APV()
VOP_IOCTL()
vn_ioctl()
fo_ioctl()
kern_ioctl()
sys_ioctl()
Since r332974 the original problem no longer exists, but it still
makes sense to move things out of the - often congested - lock.
Reviewed By: kib, markj
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27334
-mno-align-long-strings was a flag maintained by FreeBSD for the
now-deleted in-tree gcc. Upstream gcc has no such flag, so just drop
it.
The flag was originally submitted by bde and committed in 2002 (svn
r97911 & r104455). However, upstream gcc did address this same issue in
2004 (gcc svn r76694 / git 4137ba7ab7a), reducing long string alignment
in general, and to 1 with -Os.
Reviewed by: kib
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D27768
The original fusefs GSoC project seems to have envisioned exchanging two
types of messages with FUSE servers. Perhaps vectored and non-vectored?
But in practice only one type has ever been used. Delete the other type.
Reviewed by: cem
Differential Revision: https://reviews.freebsd.org/D27770
maxphys is now a tunable, ever since r368124. The default value is also
larger than it used to be. That broke several fusefs tests that made
assumptions about maxphys.
* WriteCluster.clustering used the MAXPHYS compile-time constant.
* WriteBackAsync.direct_io_partially_overlaps_cached_block implicitly
depended on the default value of maxphys. Fix it by making the
dependency explicit.
* Write.write_large implicitly assumed that maxphys would be no more
than twice maxbcachebuf. Fix it by explicitly setting m_max_write.
* WriteCluster.clustering and several others failed because the MockFS
module did not work for max_write > 128KB (which most tests would set
when maxphys > 256KB). Limit max_write accordingly. This is the same
as fusefs-libs's behavior.
* Bmap's tests were originally written for MAXPHYS=128KB. With larger
values, the simulated file size was too small.
PR: 252096
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D27769
Commit 41fb066511 doubled the number of glyph maps in the vfnt format
from 2 to 4 to support double-width characters, but a comment describing
the maps was not updated to match.
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Statically link rtld-elf with libcompiler_rt on all architectures so
that we don't need to try to pick and choose the bits we need from it
for each architecture (we now leave that to the linker). Compilers may
emit calls to support functions in this library, but because of the use
of the linker flag -nostdlib for rtld's special needs, the library is
not linked as normal.
Previously we had two different solutions. On some architectures, we
were able to extract reimplementations of the necessary builtin
functions from our special build of libc. On ARM, we just linked
libcompiler_rt.
This is motivated by the same issue as D26199 and D27665, but should be
a simpler solution that will apply to all architectures.
Reviewed by: arichardson, kib
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D27736
libcompiler_rt implements certain functions that clang and gcc emit
calls to as part of their codegen (e.g. for extended width math). Build
it without stack smashing protection (SSP, -fstack-protector) in order
to support building binaries without SSP, especially the dynamic linker.
Besides, SSP is probably not very valuable in this library.
Reviewed by: arichardson, dim, kib
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D27786
This debatably could have waited until the next update would have taken
place, but it's easier to see what changes if we get it out of the way
now.
MFC after: 3 days
Both FreeBSD and Linux mkdir -p walk the tree up ignoring any EEXIST on
the way and both are used a lot when building respective kernels.
This poses a problem as spurious locking avoidably interferes with
concurrent operations like getdirentries on affected directories.
Work around the problem by adding FAILIFEXISTS flag. In case of lockless
lookup this manages to avoid any work to begin with, there is no speed
up for the locked case but perhaps this can be augmented later on.
For simplicity the only supported semantics are as used by mkdir.
Reviewed by: kib (previous version)
Differential Revision: https://reviews.freebsd.org/D27789
lua: avoid gcc -Wreturn-local-addr bug
Avoid a bug with gcc's -Wreturn-local-addr warning with some
obfuscation. In buggy versions of gcc, if a return value is an
expression that involves the address of a local variable, and even if
that address is legally converted to a non-pointer type, a warning may
be emitted and the value of the address may be replaced with zero.
Howerver, buggy versions don't emit the warning or replace the value
when simply returning a local variable of non-pointer type.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90737
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Libby <rlibby@FreeBSD.org>
Closes#11337
spa: avoid type narrowing warning
Building the spa module for i386 caused gcc to emit
-Wint-to-pointer-cast "cast to pointer from integer of different size"
because spa.spa_did was uint64_t but pthread_join (via thread_join in
spa_deactivate) takes a pointer (32-bit on i386). Define spa_did to be
pointer-size instead. For now spa_did is in fact never non-zero and the
thread_join could instead be ifdef'd out, but changing the size of
spa_did may be more useful for the future.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Libby <rlibby@FreeBSD.org>
Closes#11336
FreeBSD libzfs: gcc requires __thread after static
Building libzfs with gcc on FreeBSD failed because gcc is picky about
the order of keywords in declarations with __thread, whereas clang is
more relaxed.
https://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ryan Libby <rlibby@FreeBSD.org>
Closes#11331
Fix compiling on FreeBSD + gcc - don't assume illmnos bits
This looks like it was once from the illumnos compat code.
FreeBSD doesn't have cmn_err as a compiler format attribute, so
it definitely errors out.
It doesn't show up on LLVM because it doesn't trigger at all.
Add in the format flags but keep them behind #if 0 for now;
there are too many format issues that trigger when one does
format checking in the shared code.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: adrian chadd <adrian@freebsd.org>
Closes#11068Closes#11069
Fix pointer-is-uint64_t-sized assumption in the ioctl path
This shows up when compiling freebsd-head on amd64 using gcc-6.4.
The lib32 compat build ends up tripping over this assumption.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: adrian chadd <adrian@freebsd.org>
Closes#11068Closes#11069
- Suppress -Wredundant-decls. Ultimately this warning is harmless in
any case, and it does not look like there is a simple way to avoid
redundant declarations in this case without a lot of header pollution
(e.g. having openzfs's shim param.h pulling in sys/kernel.h for hz).
- Suppress -Wnested-externs, which is useless anyway.
Unfortunately it was not sufficient just to modify OPENZFS_CFLAGS,
because the warning suppressions need to appear on the command line
after they are explicitly enabled by CWARNFLAGS from sys/conf/kern.mk,
but OPENZFS_CFLAGS get added before due to use of -I for the shims.
Reviewed by: markj
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D27685
This was missed in r340856 / commit
6d2e2df764. Three bytes from the kernel
stack may be leaked when reading directory entries.
Reported by: Syed Faraz Abrar <faraz@elttam.com>
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
In vm_page_busy_acquire(), load the object pointer using
atomic_load_ptr() as we do elsewhere. Per the comment, the object
identity must be consistent across sleeps.
In vm_page_grab_sleep(), pass the correct pindex to
_vm_page_busy_sleep(). The pindex is used to re-check the page's
identity before going to sleep. In particular, vm_page_grab_sleep() is
used in unlocked grab, so the object lock is not necessarily held when
verifying the page's identity, and the pindex may change if the page is
moved, or freed and re-allocated. I believe this can result in spurious
VM_PAGER_FAILs from vm_page_grab_valid_unlocked() or early termination
of vm_page_grab_pages_unlocked().
In vm_page_grab_pages(), pass the correct pindex to
vm_page_grab_sleep(). Otherwise I believe vm_page_grab_pages() will
effectively spin when attempting to busy a busy page after the first
index in the range.
Reviewed by: alc, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27607
Account for any residual bytes. This is only relevant for vnode-backed
md(4) devices.
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27738
This change has been motivated by a mail from bde sent in 2015 in
which he mentioned inappropriate use of sscanf() in 3 programs in
/bin.
This change removes the potential mismatch of the types of the return
values and the variable width specified in the scan pattern. While
there was no issue with the patterns and types used, the new code is
simpler and more efficient.
The previous version normalized the width list (replaced empty fields
with "0") just to be able to use sscanf() on the string.
It is much simpler to just parse the string as-is.
The clearing of f_notabs is preserved for the case that less than 9
width values have been defined, but I do not understand the rationale
for this particular condition. E.g., LS_COLWIDTHS="::::::::" will be
counted as 9 defined fields (may clear f_notabs) but is no different
fron LS_COLWIDTHS="" with regard to the field width (and that does not
clear f_notabs, since there are less than 9 fields).
The previous patch failed to set the ISDOTDOT flag when appropriate,
which in turn fail to properly handle degenerate lookups.
While here sprinkle some extra assertions.
Tested by: pho (previous version)
