13 Dec, 2019
7 commits
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The ORC unwinder has two tables: .orc_unwind_ip and .orc_unwind, which
need to be sorted for binary search. Previously this sorting was done
during bootup.Sort them at build time to speed up booting.
Add the ORC tables sorting in a parallel build process to speed up the build.
[ mingo: Rewrote the changelog and fixed some comments. ]
Suggested-by: Andy Lutomirski
Suggested-by: Peter Zijlstra
Reported-by: kbuild test robot
Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-7-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
Use a more generic name for additional table sorting usecases,
such as the upcoming ORC table sorting feature. This tool is
not tied to exception table sorting anymore.No functional changes intended.
[ mingo: Rewrote the changelog. ]
Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-6-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
Refine the loop, naming and code structure, make the code more readable
and extendable. No functional changes intended.Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-5-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-4-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
Fix various style errors and inconsistencies, no functional changes
intended.Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-3-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
The scripts/sortextable.c code has originally copied some code from
scripts/recordmount.c, which used the same setjmp/longjmp method to
manage control flow.Meanwhile recordmcount has improved its error handling via:
3f1df12019f3 ("recordmcount: Rewrite error/success handling").
So rewrite this part of sortextable as well to get rid of the setjmp/longjmp
kludges, with additional refactoring, to make it more readable and
easier to extend.No functional changes intended.
[ mingo: Rewrote the changelog. ]
Signed-off-by: Shile Zhang
Acked-by: Peter Zijlstra (Intel)
Cc: Josh Poimboeuf
Cc: Masahiro Yamada
Cc: Michal Marek
Cc: linux-kbuild@vger.kernel.org
Link: https://lkml.kernel.org/r/20191204004633.88660-2-shile.zhang@linux.alibaba.com
Signed-off-by: Ingo Molnar -
Pull ceph fixes from Ilya Dryomov:
"A fix to avoid a corner case when scheduling cap reclaim in batches
from Xiubo, a patch to add some observability into cap waiters from
Jeff and a couple of cleanups"* tag 'ceph-for-5.5-rc2' of git://github.com/ceph/ceph-client:
ceph: add more debug info when decoding mdsmap
ceph: switch to global cap helper
ceph: trigger the reclaim work once there has enough pending caps
ceph: show tasks waiting on caps in debugfs caps file
ceph: convert int fields in ceph_mount_options to unsigned int
12 Dec, 2019
8 commits
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Pull AFS fixes from David Howells:
"Fixes for AFS plus one patch to make debugging easier:- Fix how addresses are matched to server records. This is currently
incorrect which means cache invalidation callbacks from the server
don't necessarily get delivered correctly. This causes stale data
and metadata to be seen under some circumstances.- Make the dynamic root superblock R/W so that rpm/dnf can reapply
the SELinux label to it when upgrading the Fedora filesystem-afs
package. If the filesystem is R/O, this fails and the upgrade
fails.It might be better in future to allow setxattr from an LSM to
bypass the R/O protections, if only for pseudo-filesystems.- Fix the parsing of mountpoint strings. The mountpoint object has to
have a terminal dot, whereas the source/device string passed to
mount should not. This confuses type-forcing suffix detection
leading to the wrong volume variant being mounted.- Make lookups in the dynamic root superblock for creation events
(such as mkdir) fail with EOPNOTSUPP rather than something like
EEXIST. The dynamic root only allows implicit creation by the
->lookup() method - and only if the target cell exists.- Fix the looking up of an AFS superblock to include the cell in the
matching key - otherwise all volumes with the same ID number are
treated as the same thing, irrespective of which cell they're in.- Show the volume name of each volume in the volume records displayed
in /proc/net/afs//volumes. This proved useful in debugging as
it provides a way to map the volume IDs to names, where the names
are what appear in /proc/mounts"* tag 'afs-fixes-20191211' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Show volume name in /proc/net/afs//volumes
afs: Fix missing cell comparison in afs_test_super()
afs: Fix creation calls in the dynamic root to fail with EOPNOTSUPP
afs: Fix mountpoint parsing
afs: Fix SELinux setting security label on /afs
afs: Fix afs_find_server lookups for ipv4 peers -
Pull erofs fixes from Gao Xiang:
"Mainly address a regression reported by David recently observed
together with overlayfs due to the improper return value of
listxattr() without xattr. Update outdated expressions in document as
well.Summary:
- Fix improper return value of listxattr() with no xattr
- Keep up documentation with latest code"
* tag 'erofs-for-5.5-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: update documentation
erofs: zero out when listxattr is called with no xattr -
Pull tracing fixes from Steven Rostedt:
- Remove code I accidentally applied when doing a minor fix up to a
patch, and then using "git commit -a --amend", which pulled in some
other changes I was playing with.- Remove an used variable in trace_events_inject code
- Fix function graph tracer when it traces a ftrace direct function.
It will now ignore tracing a function that has a ftrace direct
tramploine attached. This is needed for eBPF to use the ftrace direct
code.* tag 'trace-v5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
ftrace: Fix function_graph tracer interaction with BPF trampoline
tracing: remove set but not used variable 'buffer'
module: Remove accidental change of module_enable_x() -
There's no need to separately check for signals while inside the locked
region, since we're going to do "wait_event_interruptible()" right
afterwards anyway, and the error handling is much simpler there.The check for whether we had already read anything was also redundant,
since we no longer do the odd merging of reads when there are pending
writers.But perhaps more importantly, this adds commentary about why we still
need to wake up possible writers even though we didn't read any data,
and why we can skip all the finishing touches now if we get a signal (or
had a signal pending) while waiting for more data.[ This is a split-out cleanup from my "make pipe IO use exclusive wait
queues" thing, which I can't apply because it triggers a nasty bug in
the GNU make jobserver - Linus ]Signed-off-by: Linus Torvalds
-
Show the name of each volume in /proc/net/afs//volumes to make it
easier to work out the name corresponding to a volume ID. This makes it
easier to work out which mounts in /proc/mounts correspond to which volume
ID.Signed-off-by: David Howells
Reviewed-by: Marc Dionne -
Fix missing cell comparison in afs_test_super(). Without this, any pair
volumes that have the same volume ID will share a superblock, no matter the
cell, unless they're in different network namespaces.Normally, most users will only deal with a single cell and so they won't
see this. Even if they do look into a second cell, they won't see a
problem unless they happen to hit a volume with the same ID as one they've
already got mounted.Before the patch:
# ls /afs/grand.central.org/archive
linuxdev/ mailman/ moin/ mysql/ pipermail/ stage/ twiki/
# ls /afs/kth.se/
linuxdev/ mailman/ moin/ mysql/ pipermail/ stage/ twiki/
# cat /proc/mounts | grep afs
none /afs afs rw,relatime,dyn,autocell 0 0
#grand.central.org:root.cell /afs/grand.central.org afs ro,relatime 0 0
#grand.central.org:root.archive /afs/grand.central.org/archive afs ro,relatime 0 0
#grand.central.org:root.archive /afs/kth.se afs ro,relatime 0 0After the patch:
# ls /afs/grand.central.org/archive
linuxdev/ mailman/ moin/ mysql/ pipermail/ stage/ twiki/
# ls /afs/kth.se/
admin/ common/ install/ OldFiles/ service/ system/
bakrestores/ home/ misc/ pkg/ src/ wsadmin/
# cat /proc/mounts | grep afs
none /afs afs rw,relatime,dyn,autocell 0 0
#grand.central.org:root.cell /afs/grand.central.org afs ro,relatime 0 0
#grand.central.org:root.archive /afs/grand.central.org/archive afs ro,relatime 0 0
#kth.se:root.cell /afs/kth.se afs ro,relatime 0 0Fixes: ^1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Carsten Jacobi
Signed-off-by: David Howells
Reviewed-by: Marc Dionne
Tested-by: Jonathan Billings
cc: Todd DeSantis -
Fix the lookup method on the dynamic root directory such that creation
calls, such as mkdir, open(O_CREAT), symlink, etc. fail with EOPNOTSUPP
rather than failing with some odd error (such as EEXIST).lookup() itself tries to create automount directories when it is invoked.
These are cached locally in RAM and not committed to storage.Signed-off-by: David Howells
Reviewed-by: Marc Dionne
Tested-by: Jonathan Billings -
Each AFS mountpoint has strings that define the target to be mounted. This
is required to end in a dot that is supposed to be stripped off. The
string can include suffixes of ".readonly" or ".backup" - which are
supposed to come before the terminal dot. To add to the confusion, the "fs
lsmount" afs utility does not show the terminal dot when displaying the
string.The kernel mount source string parser, however, assumes that the terminal
dot marks the suffix and that the suffix is always "" and is thus ignored.
In most cases, there is no suffix and this is not a problem - but if there
is a suffix, it is lost and this affects the ability to mount the correct
volume.The command line mount command, on the other hand, is expected not to
include a terminal dot - so the problem doesn't arise there.Fix this by making sure that the dot exists and then stripping it when
passing the string to the mount configuration.Fixes: bec5eb614130 ("AFS: Implement an autocell mount capability [ver #2]")
Reported-by: Jonathan Billings
Signed-off-by: David Howells
Reviewed-by: Marc Dionne
Tested-by: Jonathan Billings
11 Dec, 2019
3 commits
-
Depending on type of BPF programs served by BPF trampoline it can call original
function. In such case the trampoline will skip one stack frame while
returning. That will confuse function_graph tracer and will cause crashes with
bad RIP. Teach graph tracer to skip functions that have BPF trampoline attached.Signed-off-by: Alexei Starovoitov
Signed-off-by: Steven Rostedt (VMware) -
kernel/trace/trace_events_inject.c: In function trace_inject_entry:
kernel/trace/trace_events_inject.c:20:22: warning: variable buffer set but not used [-Wunused-but-set-variable]It is never used, so remove it.
Link: http://lkml.kernel.org/r/20191207034409.25668-1-yuehaibing@huawei.com
Reported-by: Hulk Robot
Acked-by: Cong Wang
Signed-off-by: YueHaibing
Signed-off-by: Steven Rostedt (VMware) -
When pulling in Divya Indi's patch, I made a minor fix to remove unneeded
braces. I commited my fix up via "git commit -a --amend". Unfortunately, I
didn't realize I had some changes I was testing in the module code, and
those changes were applied to Divya's patch as well.This reverts the accidental updates to the module code.
Cc: Jessica Yu
Cc: Divya Indi
Reported-by: Peter Zijlstra
Fixes: e585e6469d6f ("tracing: Verify if trace array exists before destroying it.")
Signed-off-by: Steven Rostedt (VMware)
10 Dec, 2019
10 commits
-
Pull btrfs Kconfig fix from David Sterba:
"This adds the config dependency integrating the crypto code and btrfs
support for blake2b (added in this dev cycle, via different trees).Without it the option had to be selected manually"
* tag 'for-5.5-rc1-kconfig-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: add Kconfig dependency for BLAKE2B -
Show the laggy state.
Signed-off-by: Xiubo Li
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
__ceph_is_any_caps is a duplicate helper.
Signed-off-by: Xiubo Li
Reviewed-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
The nr in ceph_reclaim_caps_nr() is very possibly larger than 1,
so we may miss it and the reclaim work couldn't triggered as expected.Signed-off-by: Xiubo Li
Reviewed-by: "Yan, Zheng"
Signed-off-by: Ilya Dryomov -
Add some visibility of tasks that are waiting for caps to the "caps"
debugfs file. Display the tgid of the waiting task, inode number, and
the caps the task needs and wants.Signed-off-by: Jeff Layton
Reviewed-by: "Yan, Zheng"
Signed-off-by: Ilya Dryomov -
Most of these values should never be negative, so convert them to
unsigned values. Add some sanity checking to the parsed values, and
clean up some unneeded casts.Note that while caps_max should never be negative, this patch leaves
it signed, since this value ends up later being compared to a signed
counter. Just ensure that userland never passes in a negative value
for caps_max.Signed-off-by: Jeff Layton
Signed-off-by: Ilya Dryomov -
…nux/kernel/git/pmladek/printk
Pull pr_warning() removal from Petr Mladek.
- Final removal of the unused pr_warning() alias.
You're supposed to use just "pr_warn()" in the kernel.
* tag 'printk-for-5.5-pr-warning-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
checkpatch: Drop pr_warning check
printk: Drop pr_warning definition
Fix up for "printk: Drop pr_warning definition"
workqueue: Use pr_warn instead of pr_warning -
Pull thermal fixes from Zhang Rui:
"Starting from this release cycle, we have Daniel Lezcano work as the
new thermal co-maintainer because Eduardo's email is bouncing for
sometime and we can not reach him. We also have a new shared git tree
so that both Daniel and I can actively working on it.Specifics:
- Update MAINTAINER file for new thermal co-maintainer and new
thermal git tree address. (Daniel Lezcano, Florian Fainelli, Zhang
Rui)- Fix a Kconfig warning. (YueHaibing)"
* tag 'thermal-5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux:
MAINTAINERS: thermal: Change the git tree location
MAINTAINERS: thermal: Add Daniel Lezcano as the thermal maintainer
MAINTAINERS: thermal: Eduardo's email is bouncing
thermal: power_allocator: Fix Kconfig warning -
Because the BLAKE2B code went through a different tree, it was not
available at the time the btrfs part was merged. Now that the Kconfig
symbol exists, add it to the list.Signed-off-by: David Sterba
-
Make the AFS dynamic root superblock R/W so that SELinux can set the
security label on it. Without this, upgrades to, say, the Fedora
filesystem-afs RPM fail if afs is mounted on it because the SELinux label
can't be (re-)applied.It might be better to make it possible to bypass the R/O check for LSM
label application through setxattr.Fixes: 4d673da14533 ("afs: Support the AFS dynamic root")
Signed-off-by: David Howells
Reviewed-by: Marc Dionne
cc: selinux@vger.kernel.org
cc: linux-security-module@vger.kernel.org
09 Dec, 2019
6 commits
-
afs_find_server tries to find a server that has an address that
matches the transport address of an rxrpc peer. The code assumes
that the transport address is always ipv6, with ipv4 represented
as ipv4 mapped addresses, but that's not the case. If the transport
family is AF_INET, srx->transport.sin6.sin6_addr.s6_addr32[] will
be beyond the actual ipv4 address and will always be 0, and all
ipv4 addresses will be seen as matching.As a result, the first ipv4 address seen on any server will be
considered a match, and the server returned may be the wrong one.One of the consequences is that callbacks received over ipv4 will
only be correctly applied for the server that happens to have the
first ipv4 address on the fs_addresses4 list. Callbacks over ipv4
from all other servers are dropped, causing the client to serve stale
data.This is fixed by looking at the transport family, and comparing ipv4
addresses based on a sockaddr_in structure rather than a sockaddr_in6.Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: Marc Dionne
Signed-off-by: David Howells -
Pull networking fixes from David Miller:
1) More jumbo frame fixes in r8169, from Heiner Kallweit.
2) Fix bpf build in minimal configuration, from Alexei Starovoitov.
3) Use after free in slcan driver, from Jouni Hogander.
4) Flower classifier port ranges don't work properly in the HW offload
case, from Yoshiki Komachi.5) Use after free in hns3_nic_maybe_stop_tx(), from Yunsheng Lin.
6) Out of bounds access in mqprio_dump(), from Vladyslav Tarasiuk.
7) Fix flow dissection in dsa TX path, from Alexander Lobakin.
8) Stale syncookie timestampe fixes from Guillaume Nault.
[ Did an evil merge to silence a warning introduced by this pull - Linus ]
* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (84 commits)
r8169: fix rtl_hw_jumbo_disable for RTL8168evl
net_sched: validate TCA_KIND attribute in tc_chain_tmplt_add()
r8169: add missing RX enabling for WoL on RTL8125
vhost/vsock: accept only packets with the right dst_cid
net: phy: dp83867: fix hfs boot in rgmii mode
net: ethernet: ti: cpsw: fix extra rx interrupt
inet: protect against too small mtu values.
gre: refetch erspan header from skb->data after pskb_may_pull()
pppoe: remove redundant BUG_ON() check in pppoe_pernet
tcp: Protect accesses to .ts_recent_stamp with {READ,WRITE}_ONCE()
tcp: tighten acceptance of ACKs not matching a child socket
tcp: fix rejected syncookies due to stale timestamps
lpc_eth: kernel BUG on remove
tcp: md5: fix potential overestimation of TCP option space
net: sched: allow indirect blocks to bind to clsact in TC
net: core: rename indirect block ingress cb function
net-sysfs: Call dev_hold always in netdev_queue_add_kobject
net: dsa: fix flow dissection on Tx path
net/tls: Fix return values to avoid ENOTSUPP
net: avoid an indirect call in ____sys_recvmsg()
... -
Pull more SCSI updates from James Bottomley:
"Eleven patches, all in drivers (no core changes) that are either minor
cleanups or small fixes.They were late arriving, but still safe for -rc1"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: MAINTAINERS: Add the linux-scsi mailing list to the ISCSI entry
scsi: megaraid_sas: Make poll_aen_lock static
scsi: sd_zbc: Improve report zones error printout
scsi: qla2xxx: Fix qla2x00_request_irqs() for MSI
scsi: qla2xxx: unregister ports after GPN_FT failure
scsi: qla2xxx: fix rports not being mark as lost in sync fabric scan
scsi: pm80xx: Remove unused include of linux/version.h
scsi: pm80xx: fix logic to break out of loop when register value is 2 or 3
scsi: scsi_transport_sas: Fix memory leak when removing devices
scsi: lpfc: size cpu map by last cpu id set
scsi: ibmvscsi_tgt: Remove unneeded variable rc -
Pull cifs fixes from Steve French:
"Nine cifs/smb3 fixes:- one fix for stable (oops during oplock break)
- two timestamp fixes including important one for updating mtime at
close to avoid stale metadata caching issue on dirty files (also
improves perf by using SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB over the
wire)- two fixes for "modefromsid" mount option for file create (now
allows mode bits to be set more atomically and accurately on create
by adding "sd_context" on create when modefromsid specified on
mount)- two fixes for multichannel found in testing this week against
different servers- two small cleanup patches"
* tag '5.5-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
smb3: improve check for when we send the security descriptor context on create
smb3: fix mode passed in on create for modetosid mount option
cifs: fix possible uninitialized access and race on iface_list
cifs: Fix lookup of SMB connections on multichannel
smb3: query attributes on file close
smb3: remove unused flag passed into close functions
cifs: remove redundant assignment to pointer pneg_ctxt
fs: cifs: Fix atime update check vs mtime
CIFS: Fix NULL-pointer dereference in smb2_push_mandatory_locks -
Pull misc vfs cleanups from Al Viro:
"No common topic, just three cleanups".* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
make __d_alloc() static
fs/namespace: add __user to open_tree and move_mount syscalls
fs/fnctl: fix missing __user in fcntl_rw_hint()
08 Dec, 2019
6 commits
-
Some on-disk structures, fields have been renamed in v5.4,
the corresponding document should be updated as well.Also fix misrespresentation of file time and words about
fixed-sized output compression, data inline, etc.Link: https://lore.kernel.org/r/20191207025509.6614-1-hsiangkao@aol.com/
Signed-off-by: Gao Xiang -
Pull NTB update from Jon Mason:
"Just a simple patch to add a new Hygon Device ID to the AMD NTB device
driver"* tag 'ntb-5.5' of git://github.com/jonmason/ntb:
NTB: Add Hygon Device ID -
Pull more input updates from Dmitry Torokhov:
- fixups for Synaptics RMI4 driver
- a quirk for Goodinx touchscreen on Teclast tablet
- a new keycode definition for activating privacy screen feature found
on a few "enterprise" laptops- updates to snvs_pwrkey driver
- polling uinput device for writing (which is always allowed) now works
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: synaptics-rmi4 - don't increment rmiaddr for SMBus transfers
Input: synaptics-rmi4 - re-enable IRQs in f34v7_do_reflash
Input: goodix - add upside-down quirk for Teclast X89 tablet
Input: add privacy screen toggle keycode
Input: uinput - fix returning EPOLLOUT from uinput_poll
Input: snvs_pwrkey - remove gratuitous NULL initializers
Input: snvs_pwrkey - send key events for i.MX6 S, DL and Q -
Pull iomap fixes from Darrick Wong:
"Fix a race condition and a use-after-free error:- Fix a UAF when reporting writeback errors
- Fix a race condition when handling page uptodate on fragmented file
with blocksize < pagesize"* tag 'iomap-5.5-merge-14' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
iomap: stop using ioend after it's been freed in iomap_finish_ioend()
iomap: fix sub-page uptodate handling -
Pull xfs fixes from Darrick Wong:
"Fix a couple of resource management errors and a hang:- fix a crash in the log setup code when log mounting fails
- fix a hang when allocating space on the realtime device
- fix a block leak when freeing space on the realtime device"
* tag 'xfs-5.5-merge-17' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix mount failure crash on invalid iclog memory access
xfs: don't check for AG deadlock for realtime files in bunmapi
xfs: fix realtime file data space leak -
Pull orangefs update from Mike Marshall:
"orangefs: posix open permission checking...Orangefs has no open, and orangefs checks file permissions on each
file access. Posix requires that file permissions be checked on open
and nowhere else. Orangefs-through-the-kernel needs to seem posix
compliant.The VFS opens files, even if the filesystem provides no method. We can
see if a file was successfully opened for read and or for write by
looking at file->f_mode.When writes are flowing from the page cache, file is no longer
available. We can trust the VFS to have checked file->f_mode before
writing to the page cache.The mode of a file might change between when it is opened and IO
commences, or it might be created with an arbitrary mode.We'll make sure we don't hit EACCES during the IO stage by using
UID 0"[ This is "posixish", but not a great solution in the long run, since a
proper secure network server shouldn't really trust the client like this.
But proper and secure POSIX behavior requires an open method and a
resulting cookie for IO of some kind, or similar. - Linus ]* tag 'for-linus-5.5-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux:
orangefs: posix open permission checking...
