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Pull ceph updates from Ilya Dryomov:
"The highlights are:
- OSD/MDS latency and caps cache metrics infrastructure for the
filesytem (Xiubo Li). Currently available through debugfs and will
be periodically sent to the MDS in the future.
- support for replica reads (balanced and localized reads) for rbd
and the filesystem (myself). The default remains to always read
from primary, users can opt-in with the new crush_location and
read_from_replica options. Note that reading from replica is safe
for general use only since Octopus.
- support for RADOS allocation hint flags (myself). Currently used by
rbd to propagate the compressible/incompressible hint given with
the new compression_hint map option and ready for passing on more
advanced hints, e.g. based on fadvise() from the filesystem.
- support for efficient cross-quota-realm renames (Luis Henriques)
- assorted cap handling improvements and cleanups, particularly
untangling some of the locking (Jeff Layton)"
* tag 'ceph-for-5.8-rc1' of git://github.com/ceph/ceph-client: (29 commits)
rbd: compression_hint option
libceph: support for alloc hint flags
libceph: read_from_replica option
libceph: support for balanced and localized reads
libceph: crush_location infrastructure
libceph: decode CRUSH device/bucket types and names
libceph: add non-asserting rbtree insertion helper
ceph: skip checking caps when session reconnecting and releasing reqs
ceph: make sure mdsc->mutex is nested in s->s_mutex to fix dead lock
ceph: don't return -ESTALE if there's still an open file
libceph, rbd: replace zero-length array with flexible-array
ceph: allow rename operation under different quota realms
ceph: normalize 'delta' parameter usage in check_quota_exceeded
ceph: ceph_kick_flushing_caps needs the s_mutex
ceph: request expedited service on session's last cap flush
ceph: convert mdsc->cap_dirty to a per-session list
ceph: reset i_requested_max_size if file write is not wanted
ceph: throw a warning if we destroy session with mutex still locked
ceph: fix potential race in ceph_check_caps
ceph: document what protects i_dirty_item and i_flushing_item
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
Pull gfs2 updates from Andreas Gruenbacher:
- An iopen glock locking scheme rework that speeds up deletes of inodes
accessed from multiple nodes
- Various bug fixes and debugging improvements
- Convert gfs2-glocks.txt to ReST
* tag 'gfs2-for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
gfs2: fix use-after-free on transaction ail lists
gfs2: new slab for transactions
gfs2: initialize transaction tr_ailX_lists earlier
gfs2: Smarter iopen glock waiting
gfs2: Wake up when setting GLF_DEMOTE
gfs2: Check inode generation number in delete_work_func
gfs2: Move inode generation number check into gfs2_inode_lookup
gfs2: Minor gfs2_lookup_by_inum cleanup
gfs2: Try harder to delete inodes locally
gfs2: Give up the iopen glock on contention
gfs2: Turn gl_delete into a delayed work
gfs2: Keep track of deleted inode generations in LVBs
gfs2: Allow ASPACE glocks to also have an lvb
gfs2: instrumentation wrt log_flush stuck
gfs2: introduce new gfs2_glock_assert_withdraw
gfs2: print mapping->nrpages in glock dump for address space glocks
gfs2: Only do glock put in gfs2_create_inode for free inodes
gfs2: Allow lock_nolock mount to specify jid=X
gfs2: Don't ignore inode write errors during inode_go_sync
docs: filesystems: convert gfs2-glocks.txt to ReST
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Merge still more updates from Andrew Morton:
"Various trees. Mainly those parts of MM whose linux-next dependents
are now merged. I'm still sitting on ~160 patches which await merges
from -next.
Subsystems affected by this patch series: mm/proc, ipc, dynamic-debug,
panic, lib, sysctl, mm/gup, mm/pagemap"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (52 commits)
doc: cgroup: update note about conditions when oom killer is invoked
module: move the set_fs hack for flush_icache_range to m68k
nommu: use flush_icache_user_range in brk and mmap
binfmt_flat: use flush_icache_user_range
exec: use flush_icache_user_range in read_code
exec: only build read_code when needed
m68k: implement flush_icache_user_range
arm: rename flush_cache_user_range to flush_icache_user_range
xtensa: implement flush_icache_user_range
sh: implement flush_icache_user_range
asm-generic: add a flush_icache_user_range stub
mm: rename flush_icache_user_range to flush_icache_user_page
arm,sparc,unicore32: remove flush_icache_user_range
riscv: use asm-generic/cacheflush.h
powerpc: use asm-generic/cacheflush.h
openrisc: use asm-generic/cacheflush.h
m68knommu: use asm-generic/cacheflush.h
microblaze: use asm-generic/cacheflush.h
ia64: use asm-generic/cacheflush.h
hexagon: use asm-generic/cacheflush.h
...
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load_flat_file works on user addresses.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200515143646.3857579-28-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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read_code operates on user addresses.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200515143646.3857579-27-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Only build read_code when binary formats that use it are built into the
kernel.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200515143646.3857579-26-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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After a recent change introduced by Vlastimil's series [0], kernel is
able now to handle sysctl parameters on kernel command line; also, the
series introduced a simple infrastructure to convert legacy boot
parameters (that duplicate sysctls) into sysctl aliases.
This patch converts the watchdog parameters softlockup_panic and
{hard,soft}lockup_all_cpu_backtrace to use the new alias infrastructure.
It fixes the documentation too, since the alias only accepts values 0 or
1, not the full range of integers.
We also took the opportunity here to improve the documentation of the
previously converted hung_task_panic (see the patch series [0]) and put
the alias table in alphabetical order.
[0] http://lkml.kernel.org/r/20200427180433.7029-1-vbabka@suse.cz
Signed-off-by: Guilherme G. Piccoli <gpiccoli@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Link: http://lkml.kernel.org/r/20200507214624.21911-1-gpiccoli@canonical.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We can now handle sysctl parameters on kernel command line and have
infrastructure to convert legacy command line options that duplicate
sysctl to become a sysctl alias.
This patch converts the hung_task_panic parameter. Note that the sysctl
handler is more strict and allows only 0 and 1, while the legacy
parameter allowed any non-zero value. But there is little reason anyone
would not be using 1.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Guilherme G . Piccoli" <gpiccoli@canonical.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200427180433.7029-4-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We can now handle sysctl parameters on kernel command line, but
historically some parameters introduced their own command line
equivalent, which we don't want to remove for compatibility reasons.
We can, however, convert them to the generic infrastructure with a table
translating the legacy command line parameters to their sysctl names,
and removing the one-off param handlers.
This patch adds the support and makes the first conversion to
demonstrate it, on the (deprecated) numa_zonelist_order parameter.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Guilherme G . Piccoli" <gpiccoli@canonical.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200427180433.7029-3-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Patch series "support setting sysctl parameters from kernel command line", v3.
This series adds support for something that seems like many people
always wanted but nobody added it yet, so here's the ability to set
sysctl parameters via kernel command line options in the form of
sysctl.vm.something=1
The important part is Patch 1. The second, not so important part is an
attempt to clean up legacy one-off parameters that do the same thing as
a sysctl. I don't want to remove them completely for compatibility
reasons, but with generic sysctl support the idea is to remove the
one-off param handlers and treat the parameters as aliases for the
sysctl variants.
I have identified several parameters that mention sysctl counterparts in
Documentation/admin-guide/kernel-parameters.txt but there might be more.
The conversion also has varying level of success:
- numa_zonelist_order is converted in Patch 2 together with adding the
necessary infrastructure. It's easy as it doesn't really do anything
but warn on deprecated value these days.
- hung_task_panic is converted in Patch 3, but there's a downside that
now it only accepts 0 and 1, while previously it was any integer
value
- nmi_watchdog maps to two sysctls nmi_watchdog and hardlockup_panic,
so there's no straighforward conversion possible
- traceoff_on_warning is a flag without value and it would be required
to handle that somehow in the conversion infractructure, which seems
pointless for a single flag
This patch (of 5):
A recently proposed patch to add vm_swappiness command line parameter in
addition to existing sysctl [1] made me wonder why we don't have a
general support for passing sysctl parameters via command line.
Googling found only somebody else wondering the same [2], but I haven't
found any prior discussion with reasons why not to do this.
Settings the vm_swappiness issue aside (the underlying issue might be
solved in a different way), quick search of kernel-parameters.txt shows
there are already some that exist as both sysctl and kernel parameter -
hung_task_panic, nmi_watchdog, numa_zonelist_order, traceoff_on_warning.
A general mechanism would remove the need to add more of those one-offs
and might be handy in situations where configuration by e.g.
/etc/sysctl.d/ is impractical.
Hence, this patch adds a new parse_args() pass that looks for parameters
prefixed by 'sysctl.' and tries to interpret them as writes to the
corresponding sys/ files using an temporary in-kernel procfs mount.
This mechanism was suggested by Eric W. Biederman [3], as it handles
all dynamically registered sysctl tables, even though we don't handle
modular sysctls. Errors due to e.g. invalid parameter name or value
are reported in the kernel log.
The processing is hooked right before the init process is loaded, as
some handlers might be more complicated than simple setters and might
need some subsystems to be initialized. At the moment the init process
can be started and eventually execute a process writing to /proc/sys/
then it should be also fine to do that from the kernel.
Sysctls registered later on module load time are not set by this
mechanism - it's expected that in such scenarios, setting sysctl values
from userspace is practical enough.
[1] https://lore.kernel.org/r/BL0PR02MB560167492CA4094C91589930E9FC0@BL0PR02MB5601.namprd02.prod.outlook.com/
[2] https://unix.stackexchange.com/questions/558802/how-to-set-sysctl-using-kernel-command-line-parameter
[3] https://lore.kernel.org/r/87bloj2skm.fsf@x220.int.ebiederm.org/
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: "Guilherme G . Piccoli" <gpiccoli@canonical.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Link: http://lkml.kernel.org/r/20200427180433.7029-1-vbabka@suse.cz
Link: http://lkml.kernel.org/r/20200427180433.7029-2-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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posix_acl_permission() does not care about MAY_NOT_BLOCK, and in fact
the permission logic internally must not check that bit (it's only for
upper layers to decide whether they can block to do IO to look up the
acl information or not).
But the way the code was written, it _looked_ like it cared, since the
function explicitly did not mask that bit off.
But it has exactly two callers: one for when that bit is set, which
first clears the bit before calling posix_acl_permission(), and the
other call site when that bit was clear.
So stop the silly games "saving" the MAY_NOT_BLOCK bit that must not be
used for the actual permission test, and that currently is pointlessly
cleared by the callers when the function itself should just not care.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Rasmus Villemoes points out that the 'in_group_p()' tests can be a
noticeable expense, and often completely unnecessary. A common
situation is that the 'group' bits are the same as the 'other' bits
wrt the permissions we want to test.
So rewrite 'acl_permission_check()' to not bother checking for group
ownership when the permission check doesn't care.
For example, if we're asking for read permissions, and both 'group' and
'other' allow reading, there's really no reason to check if we're part
of the group or not: either way, we'll allow it.
Rasmus says:
"On a bog-standard Ubuntu 20.04 install, a workload consisting of
compiling lots of userspace programs (i.e., calling lots of
short-lived programs that all need to get their shared libs mapped in,
and the compilers poking around looking for system headers - lots of
/usr/lib, /usr/bin, /usr/include/ accesses) puts in_group_p around
0.1% according to perf top.
System-installed files are almost always 0755 (directories and
binaries) or 0644, so in most cases, we can avoid the binary search
and the cost of pulling the cred->groups array and in_group_p() .text
into the cpu cache"
Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor
Pull apparmor updates from John Johansen:
"Features:
- Replace zero-length array with flexible-array
- add a valid state flags check
- add consistency check between state and dfa diff encode flags
- add apparmor subdir to proc attr interface
- fail unpack if profile mode is unknown
- add outofband transition and use it in xattr match
- ensure that dfa state tables have entries
Cleanups:
- Use true and false for bool variable
- Remove semicolon
- Clean code by removing redundant instructions
- Replace two seq_printf() calls by seq_puts() in aa_label_seq_xprint()
- remove duplicate check of xattrs on profile attachment
- remove useless aafs_create_symlink
Bug fixes:
- Fix memory leak of profile proxy
- fix introspection of of task mode for unconfined tasks
- fix nnp subset test for unconfined
- check/put label on apparmor_sk_clone_security()"
* tag 'apparmor-pr-2020-06-07' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: Fix memory leak of profile proxy
apparmor: fix introspection of of task mode for unconfined tasks
apparmor: check/put label on apparmor_sk_clone_security()
apparmor: Use true and false for bool variable
security/apparmor/label.c: Clean code by removing redundant instructions
apparmor: Replace zero-length array with flexible-array
apparmor: ensure that dfa state tables have entries
apparmor: remove duplicate check of xattrs on profile attachment.
apparmor: add outofband transition and use it in xattr match
apparmor: fail unpack if profile mode is unknown
apparmor: fix nnp subset test for unconfined
apparmor: remove useless aafs_create_symlink
apparmor: add proc subdir to attrs
apparmor: add consistency check between state and dfa diff encode flags
apparmor: add a valid state flags check
AppArmor: Remove semicolon
apparmor: Replace two seq_printf() calls by seq_puts() in aa_label_seq_xprint()
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the set of driver core patches for 5.8-rc1.
Not all that huge this release, just a number of small fixes and
updates:
- software node fixes
- kobject now sends KOBJ_REMOVE when it is removed from sysfs, not
when it is removed from memory (which could come much later)
- device link additions and fixes based on testing on more devices
- firmware core cleanups
- other minor changes, full details in the shortlog
All have been in linux-next for a while with no reported issues"
* tag 'driver-core-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (23 commits)
driver core: Update device link status correctly for SYNC_STATE_ONLY links
firmware_loader: change enum fw_opt to u32
software node: implement software_node_unregister()
kobject: send KOBJ_REMOVE uevent when the object is removed from sysfs
driver core: Remove unnecessary is_fwnode_dev variable in device_add()
drivers property: When no children in primary, try secondary
driver core: platform: Fix spelling errors in platform.c
driver core: Remove check in driver_deferred_probe_force_trigger()
of: platform: Batch fwnode parsing when adding all top level devices
driver core: fw_devlink: Add support for batching fwnode parsing
driver core: Look for waiting consumers only for a fwnode's primary device
driver core: Move code to the right part of the file
Revert "Revert "driver core: Set fw_devlink to "permissive" behavior by default""
drivers: base: Fix NULL pointer exception in __platform_driver_probe() if a driver developer is foolish
firmware_loader: move fw_fallback_config to a private kernel symbol namespace
driver core: Add missing '\n' in log messages
driver/base/soc: Use kobj_to_dev() API
Add documentation on meaning of -EPROBE_DEFER
driver core: platform: remove redundant assignment to variable ret
debugfs: Use the correct style for SPDX License Identifier
...
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Pull arch/sh updates from Rich Felker:
"Fix for arch/sh build regression with newer binutils, removal of SH5,
fixes for module exports, and misc cleanup"
* tag 'sh-for-5.8' of git://git.libc.org/linux-sh:
sh: remove sh5 support
sh: add missing EXPORT_SYMBOL() for __delay
sh: Convert ins[bwl]/outs[bwl] macros to inline functions
sh: Convert iounmap() macros to inline functions
sh: Add missing DECLARE_EXPORT() for __ashiftrt_r4_xx
sh: configs: Cleanup old Kconfig IO scheduler options
arch/sh: vmlinux.scr
sh: Replace CONFIG_MTD_M25P80 with CONFIG_MTD_SPI_NOR in sh7757lcr_defconfig
sh: sh4a: Bring back tmu3_device early device
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Fixes coccicheck warning:
fs/hpfs/buffer.c:56:2-3: Unneeded semicolon
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Mikulas Patocka <mikulas@twibright.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
Pull orangefs updates from Mike Marshall:
- John Hubbard's conversion from get_user_pages() to pin_user_pages()
- Colin Ian King's removal of an unneeded variable initialization
* tag 'for-linus-5.8-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux:
orangefs: convert get_user_pages() --> pin_user_pages()
orangefs: remove redundant assignment to variable ret
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git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
Pull dlm updates from David Teigland:
"This set includes a couple minor cleanups, and dropping the
interruptible from a wait_event that waits for an event from the
userspace cluster management"
* tag 'dlm-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
dlm: remove BUG() before panic()
dlm: Switch to using wait_event()
fs:dlm:remove unneeded semicolon in rcom.c
dlm: user: Replace zero-length array with flexible-array member
dlm: dlm_internal: Replace zero-length array with flexible-array member
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Pull cifs updates from Steve French:
"22 changesets, 2 for stable.
Includes big performance improvement for large i/o when using
multichannel, also includes DFS fixes"
* tag '5.8-rc-smb3-fixes-part-1' of git://git.samba.org/sfrench/cifs-2.6: (22 commits)
cifs: update internal module version number
cifs: multichannel: try to rebind when reconnecting a channel
cifs: multichannel: use pointer for binding channel
smb3: remove static checker warning
cifs: multichannel: move channel selection above transport layer
cifs: multichannel: always zero struct cifs_io_parms
cifs: dump Security Type info in DebugData
smb3: fix incorrect number of credits when ioctl MaxOutputResponse > 64K
smb3: default to minimum of two channels when multichannel specified
cifs: multichannel: move channel selection in function
cifs: fix minor typos in comments and log messages
smb3: minor update to compression header definitions
cifs: minor fix to two debug messages
cifs: Standardize logging output
smb3: Add new parm "nodelete"
cifs: move some variables off the stack in smb2_ioctl_query_info
cifs: reduce stack use in smb2_compound_op
cifs: get rid of unused parameter in reconn_setup_dfs_targets()
cifs: handle hostnames that resolve to same ip in failover
cifs: set up next DFS target before generic_ip_connect()
...
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git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull AFS updates from David Howells:
"There's some core VFS changes which affect a couple of filesystems:
- Make the inode hash table RCU safe and providing some RCU-safe
accessor functions. The search can then be done without taking the
inode_hash_lock. Care must be taken because the object may be being
deleted and no wait is made.
- Allow iunique() to avoid taking the inode_hash_lock.
- Allow AFS's callback processing to avoid taking the inode_hash_lock
when using the inode table to find an inode to notify.
- Improve Ext4's time updating. Konstantin Khlebnikov said "For now,
I've plugged this issue with try-lock in ext4 lazy time update.
This solution is much better."
Then there's a set of changes to make a number of improvements to the
AFS driver:
- Improve callback (ie. third party change notification) processing
by:
(a) Relying more on the fact we're doing this under RCU and by
using fewer locks. This makes use of the RCU-based inode
searching outlined above.
(b) Moving to keeping volumes in a tree indexed by volume ID
rather than a flat list.
(c) Making the server and volume records logically part of the
cell. This means that a server record now points directly at
the cell and the tree of volumes is there. This removes an N:M
mapping table, simplifying things.
- Improve keeping NAT or firewall channels open for the server
callbacks to reach the client by actively polling the fileserver on
a timed basis, instead of only doing it when we have an operation
to process.
- Improving detection of delayed or lost callbacks by including the
parent directory in the list of file IDs to be queried when doing a
bulk status fetch from lookup. We can then check to see if our copy
of the directory has changed under us without us getting notified.
- Determine aliasing of cells (such as a cell that is pointed to be a
DNS alias). This allows us to avoid having ambiguity due to
apparently different cells using the same volume and file servers.
- Improve the fileserver rotation to do more probing when it detects
that all of the addresses to a server are listed as non-responsive.
It's possible that an address that previously stopped responding
has become responsive again.
Beyond that, lay some foundations for making some calls asynchronous:
- Turn the fileserver cursor struct into a general operation struct
and hang the parameters off of that rather than keeping them in
local variables and hang results off of that rather than the call
struct.
- Implement some general operation handling code and simplify the
callers of operations that affect a volume or a volume component
(such as a file). Most of the operation is now done by core code.
- Operations are supplied with a table of operations to issue
different variants of RPCs and to manage the completion, where all
the required data is held in the operation object, thereby allowing
these to be called from a workqueue.
- Put the standard "if (begin), while(select), call op, end" sequence
into a canned function that just emulates the current behaviour for
now.
There are also some fixes interspersed:
- Don't let the EACCES from ICMP6 mapping reach the user as such,
since it's confusing as to whether it's a filesystem error. Convert
it to EHOSTUNREACH.
- Don't use the epoch value acquired through probing a server. If we
have two servers with the same UUID but in different cells, it's
hard to draw conclusions from them having different epoch values.
- Don't interpret the argument to the CB.ProbeUuid RPC as a
fileserver UUID and look up a fileserver from it.
- Deal with servers in different cells having the same UUIDs. In the
event that a CB.InitCallBackState3 RPC is received, we have to
break the callback promises for every server record matching that
UUID.
- Don't let afs_statfs return values that go below 0.
- Don't use running fileserver probe state to make server selection
and address selection decisions on. Only make decisions on final
state as the running state is cleared at the start of probing"
Acked-by: Al Viro <viro@zeniv.linux.org.uk> (fs/inode.c part)
* tag 'afs-next-20200604' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (27 commits)
afs: Adjust the fileserver rotation algorithm to reprobe/retry more quickly
afs: Show more a bit more server state in /proc/net/afs/servers
afs: Don't use probe running state to make decisions outside probe code
afs: Fix afs_statfs() to not let the values go below zero
afs: Fix the by-UUID server tree to allow servers with the same UUID
afs: Reorganise volume and server trees to be rooted on the cell
afs: Add a tracepoint to track the lifetime of the afs_volume struct
afs: Detect cell aliases 3 - YFS Cells with a canonical cell name op
afs: Detect cell aliases 2 - Cells with no root volumes
afs: Detect cell aliases 1 - Cells with root volumes
afs: Implement client support for the YFSVL.GetCellName RPC op
afs: Retain more of the VLDB record for alias detection
afs: Fix handling of CB.ProbeUuid cache manager op
afs: Don't get epoch from a server because it may be ambiguous
afs: Build an abstraction around an "operation" concept
afs: Rename struct afs_fs_cursor to afs_operation
afs: Remove the error argument from afs_protocol_error()
afs: Set error flag rather than return error from file status decode
afs: Make callback processing more efficient.
afs: Show more information in /proc/net/afs/servers
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 updates from Ted Ts'o:
"A lot of bug fixes and cleanups for ext4, including:
- Fix performance problems found in dioread_nolock now that it is the
default, caused by transaction leaks.
- Clean up fiemap handling in ext4
- Clean up and refactor multiple block allocator (mballoc) code
- Fix a problem with mballoc with a smaller file systems running out
of blocks because they couldn't properly use blocks that had been
reserved by inode preallocation.
- Fixed a race in ext4_sync_parent() versus rename()
- Simplify the error handling in the extent manipulation code
- Make sure all metadata I/O errors are felected to
ext4_ext_dirty()'s and ext4_make_inode_dirty()'s callers.
- Avoid passing an error pointer to brelse in ext4_xattr_set()
- Fix race which could result to freeing an inode on the dirty last
in data=journal mode.
- Fix refcount handling if ext4_iget() fails
- Fix a crash in generic/019 caused by a corrupted extent node"
* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (58 commits)
ext4: avoid unnecessary transaction starts during writeback
ext4: don't block for O_DIRECT if IOCB_NOWAIT is set
ext4: remove the access_ok() check in ext4_ioctl_get_es_cache
fs: remove the access_ok() check in ioctl_fiemap
fs: handle FIEMAP_FLAG_SYNC in fiemap_prep
fs: move fiemap range validation into the file systems instances
iomap: fix the iomap_fiemap prototype
fs: move the fiemap definitions out of fs.h
fs: mark __generic_block_fiemap static
ext4: remove the call to fiemap_check_flags in ext4_fiemap
ext4: split _ext4_fiemap
ext4: fix fiemap size checks for bitmap files
ext4: fix EXT4_MAX_LOGICAL_BLOCK macro
add comment for ext4_dir_entry_2 file_type member
jbd2: avoid leaking transaction credits when unreserving handle
ext4: drop ext4_journal_free_reserved()
ext4: mballoc: use lock for checking free blocks while retrying
ext4: mballoc: refactor ext4_mb_good_group()
ext4: mballoc: introduce pcpu seqcnt for freeing PA to improve ENOSPC handling
ext4: mballoc: refactor ext4_mb_discard_preallocations()
...
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Pull rdma updates from Jason Gunthorpe:
"A more active cycle than most of the recent past, with a few large,
long discussed works this time.
The RNBD block driver has been posted for nearly two years now, and
flowing through RDMA due to it also introducing a new ULP.
The removal of FMR has been a recurring discussion theme for a long
time.
And the usual smattering of features and bug fixes.
Summary:
- Various small driver bugs fixes in rxe, mlx5, hfi1, and efa
- Continuing driver cleanups in bnxt_re, hns
- Big cleanup of mlx5 QP creation flows
- More consistent use of src port and flow label when LAG is used and
a mlx5 implementation
- Additional set of cleanups for IB CM
- 'RNBD' network block driver and target. This is a network block
RDMA device specific to ionos's cloud environment. It brings strong
multipath and resiliency capabilities.
- Accelerated IPoIB for HFI1
- QP/WQ/SRQ ioctl migration for uverbs, and support for multiple
async fds
- Support for exchanging the new IBTA defiend ECE data during RDMA CM
exchanges
- Removal of the very old and insecure FMR interface from all ULPs
and drivers. FRWR should be preferred for at least a decade now"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (247 commits)
RDMA/cm: Spurious WARNING triggered in cm_destroy_id()
RDMA/mlx5: Return ECE DC support
RDMA/mlx5: Don't rely on FW to set zeros in ECE response
RDMA/mlx5: Return an error if copy_to_user fails
IB/hfi1: Use free_netdev() in hfi1_netdev_free()
RDMA/hns: Uninitialized variable in modify_qp_init_to_rtr()
RDMA/core: Move and rename trace_cm_id_create()
IB/hfi1: Fix hfi1_netdev_rx_init() error handling
RDMA: Remove 'max_map_per_fmr'
RDMA: Remove 'max_fmr'
RDMA/core: Remove FMR device ops
RDMA/rdmavt: Remove FMR memory registration
RDMA/mthca: Remove FMR support for memory registration
RDMA/mlx4: Remove FMR support for memory registration
RDMA/i40iw: Remove FMR leftovers
RDMA/bnxt_re: Remove FMR leftovers
RDMA/mlx5: Remove FMR leftovers
RDMA/core: Remove FMR pool API
RDMA/rds: Remove FMR support for memory registration
RDMA/srp: Remove support for FMR memory registration
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull READ_IMPLIES_EXEC changes from Borislav Petkov:
"Split the old READ_IMPLIES_EXEC workaround from executable
PT_GNU_STACK now that toolchains long support PT_GNU_STACK marking and
there's no need anymore to force modern programs into having all its
user mappings executable instead of only the stack and the PROT_EXEC
ones.
Disable that automatic READ_IMPLIES_EXEC forcing on x86-64 and
arm64.
Add tables documenting how READ_IMPLIES_EXEC is handled on x86-64, arm
and arm64.
By Kees Cook"
* tag 'core_core_updates_for_5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
arm64/elf: Disable automatic READ_IMPLIES_EXEC for 64-bit address spaces
arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK
arm32/64/elf: Add tables to document READ_IMPLIES_EXEC
x86/elf: Disable automatic READ_IMPLIES_EXEC on 64-bit
x86/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK
x86/elf: Add table to document READ_IMPLIES_EXEC
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Before this patch, transactions could be merged into the system
transaction by function gfs2_merge_trans(), but the transaction ail
lists were never merged. Because the ail flushing mechanism can run
separately, bd elements can be attached to the transaction's buffer
list during the transaction (trans_add_meta, etc) but quickly moved
to its ail lists. Later, in function gfs2_trans_end, the transaction
can be freed (by gfs2_trans_end) while it still has bd elements
queued to its ail lists, which can cause it to either lose track of
the bd elements altogether (memory leak) or worse, reference the bd
elements after the parent transaction has been freed.
Although I've not seen any serious consequences, the problem becomes
apparent with the previous patch's addition of:
gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
to function gfs2_trans_free().
This patch adds logic into gfs2_merge_trans() to move the merged
transaction's ail lists to the sdp transaction. This prevents the
use-after-free. To do this properly, we need to hold the ail lock,
so we pass sdp into the function instead of the transaction itself.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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This patch adds a new slab for gfs2 transactions. That allows us to
reduce kernel memory fragmentation, have better organization of data
for analysis of vmcore dumps. A new centralized function is added to
free the slab objects, and it exposes use-after-free by giving
warnings if a transaction is freed while it still has bd elements
attached to its buffers or ail lists. We make sure to initialize
those transaction ail lists so we can check their integrity when freeing.
At a later time, we should add a slab initialization function to
make it more efficient, but for this initial patch I wanted to
minimize the impact.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Since transactions may be freed shortly after they're created, before
a log_flush occurs, we need to initialize their ail1 and ail2 lists
earlier. Before this patch, the ail1 list was initialized in gfs2_log_flush().
This moves the initialization to the point when the transaction is first
created.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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When trying to upgrade the iopen glock from a shared to an exclusive lock in
gfs2_evict_inode, abort the wait if there is contention on the corresponding
inode glock: in that case, the inode must still be in active use on another
node, and we're not guaranteed to get the iopen glock anytime soon.
To make this work even better, when we notice contention on the iopen glock and
we can't evict the corresponsing inode and release the iopen glock immediately,
poke the inode glock. The other node(s) trying to acquire the lock can then
abort instead of timing out.
Thanks to Heinz Mauelshagen for pointing out a locking bug in a previous
version of this patch.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Wake up the sdp->sd_async_glock_wait wait queue when setting the GLF_DEMOTE
flag.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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In delete_work_func, if the iopen glock still has an inode attached,
limit the inode lookup to that specific generation number: in the likely
case that the inode was deleted on the node on which the inode's link
count dropped to zero, we can skip verifying the on-disk block type and
reading in the inode. The same applies if another node that had the
inode open managed to delete the inode before us.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Move the inode generation number check from gfs2_lookup_by_inum into
gfs2_inode_lookup: gfs2_inode_lookup may be able to decide that an inode with
the given inode generation number cannot exist without having to verify the
block type or reading the inode from disk.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Use a zero no_formal_ino instead of a NULL pointer to indicate that any inode
generation number will qualify: a valid inode never has a zero no_formal_ino.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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When an inode's link count drops to zero and the inode is cached on
other nodes, the current behavior of gfs2 is to immediately give up and
to rely on the other node(s) to delete the inode if there is iopen glock
contention. This leads to resource group glock bouncing and the loss of
caching. With the previous patches in place, we can fix that by not
giving up immediately.
When the inode is still open on other nodes, those nodes won't be able
to evict the inode and give up the iopen glock. In that case, our lock
conversion request will time out. The unlink system call will block for
the duration of the iopen lock conversion request. We're also holding
the inode glock in EX mode for an extended duration, so other nodes
won't be able to make progress on the inode, either.
This is worse than what we had before, but we can prevent other nodes
from getting stuck by aborting our iopen locking request if there is
contention on the inode glock. This will the the subject of a future
patch.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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When there's contention on the iopen glock, it means that the link count
of the corresponding inode has dropped to zero on a remote node which is
now trying to delete the inode. In that case, try to evict the inode so
that the iopen glock will be released, which will allow the remote node
to do its job.
When the inode is still open locally, the inode's reference count won't
drop to zero and so we'll keep holding the inode and its iopen glock.
The remote node will time out its request to grab the iopen glock, and
when the inode is finally closed locally, we'll try to delete it
ourself.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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This requires flushing delayed work items in gfs2_make_fs_ro (which is called
before unmounting a filesystem).
When inodes are deleted and then recreated, pending gl_delete work items would
have no effect because the inode generations will have changed, so we can
cancel any pending gl_delete works before reusing iopen glocks.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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When deleting an inode, keep track of the generation of the deleted inode in
the inode glock Lock Value Block (LVB). When trying to delete an inode
remotely, check the last-known inode generation against the deleted inode
generation to skip duplicate remote deletes. This avoids taking the resource
group glock in order to verify the block type.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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This adds checks for gfs2_log_flush being stuck, similarly to the check
in gfs2_ail1_flush. To faciliate this and make the strings easy to grep
we move the ail1 emptying to its own function, empty_ail1_list.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Before this patch, asserts based on glocks did not print the glock with
the error. This patch introduces a new macro, gfs2_glock_assert_withdraw
which first prints the glock, then takes the assert.
This also changes a few glock asserts to the new macro.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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This patch makes the glock dumps in debugfs print the number of pages
(nrpages) for address space glocks. This will aid in debugging.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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Merge yet more updates from Andrew Morton:
- More MM work. 100ish more to go. Mike Rapoport's "mm: remove
__ARCH_HAS_5LEVEL_HACK" series should fix the current ppc issue
- Various other little subsystems
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (127 commits)
lib/ubsan.c: fix gcc-10 warnings
tools/testing/selftests/vm: remove duplicate headers
selftests: vm: pkeys: fix multilib builds for x86
selftests: vm: pkeys: use the correct page size on powerpc
selftests/vm/pkeys: override access right definitions on powerpc
selftests/vm/pkeys: test correct behaviour of pkey-0
selftests/vm/pkeys: introduce a sub-page allocator
selftests/vm/pkeys: detect write violation on a mapped access-denied-key page
selftests/vm/pkeys: associate key on a mapped page and detect write violation
selftests/vm/pkeys: associate key on a mapped page and detect access violation
selftests/vm/pkeys: improve checks to determine pkey support
selftests/vm/pkeys: fix assertion in test_pkey_alloc_exhaust()
selftests/vm/pkeys: fix number of reserved powerpc pkeys
selftests/vm/pkeys: introduce powerpc support
selftests/vm/pkeys: introduce generic pkey abstractions
selftests: vm: pkeys: use the correct huge page size
selftests/vm/pkeys: fix alloc_random_pkey() to make it really random
selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()
selftests/vm/pkeys: fix pkey_disable_clear()
selftests: vm: pkeys: add helpers for pkey bits
...
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Currently copy_string_kernel is just a wrapper around copy_strings that
simplifies the calling conventions and uses set_fs to allow passing a
kernel pointer. But due to the fact the we only need to handle a single
kernel argument pointer, the logic can be sigificantly simplified while
getting rid of the set_fs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200501104105.2621149-3-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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copy_strings_kernel is always used with a single argument,
adjust the calling convention to that.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200501104105.2621149-2-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Use a more common logging style.
Add and use pr_fmt, coalesce the format string, align arguments,
use better grammar.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vasily Averin <vvs@virtuozzo.com>
Link: http://lkml.kernel.org/r/96ff603230ca1bd60034c36519be3930c3a3a226.camel@perches.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Current readahead for FAT entries is very simple but is having some flaws,
so it is not working well for some environments. This patch improves the
readahead more or less.
The key points of modification are,
- make the readahead size tunable by using bdi->ra_pages
- care the bdi->io_pages to avoid the small size I/O request
- update readahead window before fully exhausting
With this patch, on slow USB connected 2TB hdd:
[before]
383.18sec
[after]
51.03sec
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: hyeongseok.kim <hyeongseok.kim@lge.com>
Reviewed-by: hyeongseok.kim <hyeongseok.kim@lge.com>
Link: http://lkml.kernel.org/r/87d08e1dlh.fsf@mail.parknet.co.jp
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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If FAT length == 0, the image doesn't have any data. And it can be the
cause of overlapping the root dir and FAT entries.
Also Windows treats it as invalid format.
Reported-by: syzbot+6f1624f937d9d6911e2d@syzkaller.appspotmail.com
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Link: http://lkml.kernel.org/r/87r1wz8mrd.fsf@mail.parknet.co.jp
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The ifndef was added a long time ago to support archs that would define
their own mapping function. The last user was the metag arch which was
removed from the tree, and as such there are no users left. Let's kill
it.
Signed-off-by: Anthony Iliopoulos <ailiop@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200402161543.4119-1-ailiop@suse.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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"catch" is reserved keyword in C++, rename it to something both gcc and
g++ accept.
Rename "ign" for symmetry.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200331210905.GA31680@avx2
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull execve updates from Eric Biederman:
"Last cycle for the Nth time I ran into bugs and quality of
implementation issues related to exec that could not be easily be
fixed because of the way exec is implemented. So I have been digging
into exec and cleanup up what I can.
I don't think I have exec sorted out enough to fix the issues I
started with but I have made some headway this cycle with 4 sets of
changes.
- promised cleanups after introducing exec_update_mutex
- trivial cleanups for exec
- control flow simplifications
- remove the recomputation of bprm->cred
The net result is code that is a bit easier to understand and work
with and a decrease in the number of lines of code (if you don't count
the added tests)"
* 'exec-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (24 commits)
exec: Compute file based creds only once
exec: Add a per bprm->file version of per_clear
binfmt_elf_fdpic: fix execfd build regression
selftests/exec: Add binfmt_script regression test
exec: Remove recursion from search_binary_handler
exec: Generic execfd support
exec/binfmt_script: Don't modify bprm->buf and then return -ENOEXEC
exec: Move the call of prepare_binprm into search_binary_handler
exec: Allow load_misc_binary to call prepare_binprm unconditionally
exec: Convert security_bprm_set_creds into security_bprm_repopulate_creds
exec: Factor security_bprm_creds_for_exec out of security_bprm_set_creds
exec: Teach prepare_exec_creds how exec treats uids & gids
exec: Set the point of no return sooner
exec: Move handling of the point of no return to the top level
exec: Run sync_mm_rss before taking exec_update_mutex
exec: Fix spelling of search_binary_handler in a comment
exec: Move the comment from above de_thread to above unshare_sighand
exec: Rename flush_old_exec begin_new_exec
exec: Move most of setup_new_exec into flush_old_exec
exec: In setup_new_exec cache current in the local variable me
...
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git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull proc updates from Eric Biederman:
"This has four sets of changes:
- modernize proc to support multiple private instances
- ensure we see the exit of each process tid exactly
- remove has_group_leader_pid
- use pids not tasks in posix-cpu-timers lookup
Alexey updated proc so each mount of proc uses a new superblock. This
allows people to actually use mount options with proc with no fear of
messing up another mount of proc. Given the kernel's internal mounts
of proc for things like uml this was a real problem, and resulted in
Android's hidepid mount options being ignored and introducing security
issues.
The rest of the changes are small cleanups and fixes that came out of
my work to allow this change to proc. In essence it is swapping the
pids in de_thread during exec which removes a special case the code
had to handle. Then updating the code to stop handling that special
case"
* 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
proc: proc_pid_ns takes super_block as an argument
remove the no longer needed pid_alive() check in __task_pid_nr_ns()
posix-cpu-timers: Replace __get_task_for_clock with pid_for_clock
posix-cpu-timers: Replace cpu_timer_pid_type with clock_pid_type
posix-cpu-timers: Extend rcu_read_lock removing task_struct references
signal: Remove has_group_leader_pid
exec: Remove BUG_ON(has_group_leader_pid)
posix-cpu-timer: Unify the now redundant code in lookup_task
posix-cpu-timer: Tidy up group_leader logic in lookup_task
proc: Ensure we see the exit of each process tid exactly once
rculist: Add hlists_swap_heads_rcu
proc: Use PIDTYPE_TGID in next_tgid
Use proc_pid_ns() to get pid_namespace from the proc superblock
proc: use named enums for better readability
proc: use human-readable values for hidepid
docs: proc: add documentation for "hidepid=4" and "subset=pid" options and new mount behavior
proc: add option to mount only a pids subset
proc: instantiate only pids that we can ptrace on 'hidepid=4' mount option
proc: allow to mount many instances of proc in one pid namespace
proc: rename struct proc_fs_info to proc_fs_opts
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