There were runtime checks about sizes of struct v7_super_block and struct
sysv_inode.  If one of these checks fail the kernel will panic.  Since
these values are known at compile time let's use BUILD_BUG_ON(), because
it's a standard mechanism for validation checking at build time

Link: https://lkml.kernel.org/r/20210813123020.22971-1-paskripkin@gmail.com
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: NPavel Skripkin <paskripkin@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Move seq_escape() to the header as inliner, for a small kernel text size
reduction.

Link: https://lkml.kernel.org/r/20211001122917.67228-1-andriy.shevchenko@linux.intel.comSigned-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

gcc warns about a couple of instances in which a sanity check exists but
the author wasn't sure how to react to it failing, which makes it look
like a possible bug:

  fs/hfsplus/inode.c: In function 'hfsplus_cat_read_inode':
  fs/hfsplus/inode.c:503:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    503 |                         /* panic? */;
        |                                     ^
  fs/hfsplus/inode.c:524:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    524 |                         /* panic? */;
        |                                     ^
  fs/hfsplus/inode.c: In function 'hfsplus_cat_write_inode':
  fs/hfsplus/inode.c:582:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    582 |                         /* panic? */;
        |                                     ^
  fs/hfsplus/inode.c:608:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    608 |                         /* panic? */;
        |                                     ^
  fs/hfs/inode.c: In function 'hfs_write_inode':
  fs/hfs/inode.c:464:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    464 |                         /* panic? */;
        |                                     ^
  fs/hfs/inode.c:485:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    485 |                         /* panic? */;
        |                                     ^

panic() is probably not the correct choice here, but a WARN_ON
seems appropriate and avoids the compile-time warning.

Link: https://lkml.kernel.org/r/20210927102149.1809384-1-arnd@kernel.org
Link: https://lore.kernel.org/all/20210322223249.2632268-1-arnd@kernel.org/Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NChristian Brauner <christian.brauner@ubuntu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove filenames that are not particularly useful in file comments, and
suppress checkpatch warnings

  WARNING: It's generally not useful to have the filename in the file

Link: https://lkml.kernel.org/r/1635151862-11547-3-git-send-email-konishi.ryusuke@gmail.comSigned-off-by: NRyusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Qing Wang <wangqing@vivo.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch series "nilfs2 updates".

This patch (of 2):

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the coccicheck warning:

  WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Link: https://lkml.kernel.org/r/1635151862-11547-1-git-send-email-konishi.ryusuke@gmail.com
Link: https://lkml.kernel.org/r/1634095759-4625-1-git-send-email-wangqing@vivo.com
Link: https://lkml.kernel.org/r/1635151862-11547-2-git-send-email-konishi.ryusuke@gmail.comSigned-off-by: NQing Wang <wangqing@vivo.com>
Signed-off-by: NRyusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Helps with tracking which patches have been propagated upstream and if
users are running the latest known version.

Link: https://lkml.kernel.org/r/20210908140308.18491-10-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

vmemdup_user is better than duplicating its implementation, So just
replace the open code.

  fs/coda/psdev.c:125:10-18:WARNING:opportunity for vmemdup_user

The issue is detected with the help of Coccinelle.

Link: https://lkml.kernel.org/r/20210908140308.18491-9-jaharkes@cs.cmu.eduReported-by: NZeal Robot <zealci@zte.com.cn>
Signed-off-by: NJing Yangyang <jing.yangyang@zte.com.cn>
Signed-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.

Link: https://lkml.kernel.org/r/20210908140308.18491-8-jaharkes@cs.cmu.eduSigned-off-by: NXiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: NXin Tan <tanxin.ctf@gmail.com>
Signed-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When Coda discovers an inconsistent object, it turns it into a symlink.
However we can't just follow this change in the kernel on an existing file
or directory inode that may still have references.

This patch removes the inconsistent inode from the inode hash and
allocates a new inode for the symlink object.

Link: https://lkml.kernel.org/r/20210908140308.18491-7-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We were actually fixing up the directory mtime in both branches after the
negative dentry test, it was just that one branch was only flagging the
directory inodes to refresh their attributes while the other branch used
the optional optimization to set mtime to the current time and not go back
to the Coda client.

Link: https://lkml.kernel.org/r/20210908140308.18491-6-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Somehow we hit a negative dentry in coda_rename even after checking with
d_really_is_positive.  Maybe something raced and turned the new_dentry
negative while we were fixing up directory link counts.

Link: https://lkml.kernel.org/r/20210908140308.18491-5-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

No one care 'err' in func coda_release, so better remove it.

Link: https://lkml.kernel.org/r/20210908140308.18491-4-jaharkes@cs.cmu.eduSigned-off-by: NAlex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Originally flagged by Smatch because the code implicitly assumed outSize
is not NULL for non-async upcalls because of a flag that was (not) set in
req->uc_flags.

However req->uc_flags field is in shared state and although the current
code will not allow it to be changed before the async request check the
code is more robust when it tests against the local outSize variable.

Link: https://lkml.kernel.org/r/20210908140308.18491-3-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch series "Coda updates for -next".

The following patch series contains some fixes for the Coda kernel module
I've had sitting around and were tested extensively in a development
version of the Coda kernel module that lives outside of the main kernel.

This patch (of 9):

Avoid accessing coda_inode_info from a dentry with a bad inode.

Link: https://lkml.kernel.org/r/20210908140308.18491-1-jaharkes@cs.cmu.edu
Link: https://lkml.kernel.org/r/20210908140308.18491-2-jaharkes@cs.cmu.eduSigned-off-by: NJan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Jing Yangyang <jing.yangyang@zte.com.cn>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

ramfs_parse_param does not parse key "source", and will convert
-ENOPARAM to 0. This will skip vfs_parse_fs_param_source in vfs_parse_fs_param, which
lead always "none" mount source for ramfs.

Fix it by parsing "source" in ramfs_parse_param like cgroup1_parse_param
does.

Link: https://lkml.kernel.org/r/20210924091756.1906118-1-yangerkun@huawei.comSigned-off-by: Nyangerkun <yangerkun@huawei.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

"A -= B; A" is equivalent to "A -= B".

Link: https://lkml.kernel.org/r/YVmcP256fRMqCwgK@localhost.localdomainSigned-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Commit b212921b ("elf: don't use MAP_FIXED_NOREPLACE for elf
executable mappings") reverted back to using MAP_FIXED to map ELF LOAD
segments because it was found that the segments in some binaries overlap
and can cause MAP_FIXED_NOREPLACE to fail.

The original intent of MAP_FIXED_NOREPLACE in the ELF loader was to
prevent the silent clobbering of an existing mapping (e.g.  stack) by
the ELF image, which could lead to exploitable conditions.  Quoting
commit 4ed28639 ("fs, elf: drop MAP_FIXED usage from elf_map"),
which originally introduced the use of MAP_FIXED_NOREPLACE in the
loader:

    Both load_elf_interp and load_elf_binary rely on elf_map to map
    segments [to a specific] address and they use MAP_FIXED to enforce
    that. This is however [a] dangerous thing prone to silent data
    corruption which can be even exploitable.
    ...
    Let's take CVE-2017-1000253 as an example ... we could end up mapping
    [the executable] over the existing stack ... The [stack layout] issue
    has been fixed since then ... So we should be safe and any [similar]
    attack should be impractical. On the other hand this is just too
    subtle [an] assumption ... it can break quite easily and [be] hard to
    spot.
    ...
    Address this [weakness] by changing MAP_FIXED to the newly added
    MAP_FIXED_NOREPLACE. This will mean that mmap will fail if there is
    an existing mapping clashing with the requested one [instead of
    silently] clobbering it.

Then processing ET_DYN binaries the loader already calculates a total
size for the image when the first segment is mapped, maps the entire
image, and then unmaps the remainder before the remaining segments are
then individually mapped.

To avoid the earlier problems (legitimate overlapping LOAD segments
specified in the ELF), apply the same logic to ET_EXEC binaries as well.

For both ET_EXEC and ET_DYN+INTERP use MAP_FIXED_NOREPLACE for the
initial total size mapping and then use MAP_FIXED to build the final
(possibly legitimately overlapping) mappings.  For ET_DYN w/out INTERP,
continue to map at a system-selected address in the mmap region.

Link: https://lkml.kernel.org/r/20210916215947.3993776-1-keescook@chromium.org
Link: https://lore.kernel.org/lkml/1595869887-23307-2-git-send-email-anthony.yznaga@oracle.comCo-developed-by: NAnthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: NAnthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: NKees Cook <keescook@chromium.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Chen Jingwen <chenjingwen6@huawei.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Problem Description:

When running running ~128 parallel instances of

  TZ=/etc/localtime ps -fe >/dev/null

on a 128CPU machine, the %sys utilization reaches 97%, and perf shows
the following code path as being responsible for heavy contention on the
d_lockref spinlock:

      walk_component()
        lookup_fast()
          d_revalidate()
            pid_revalidate() // returns -ECHILD
          unlazy_child()
            lockref_get_not_dead(&nd->path.dentry->d_lockref) <-- contention

The reason is that pid_revalidate() is triggering a drop from RCU to ref
path walk mode.  All concurrent path lookups thus try to grab a
reference to the dentry for /proc/, before re-executing pid_revalidate()
and then stepping into the /proc/$pid directory.  Thus there is huge
spinlock contention.

This patch allows pid_revalidate() to execute in RCU mode, meaning that
the path lookup can successfully enter the /proc/$pid directory while
still in RCU mode.  Later on, the path lookup may still drop into ref
mode, but the contention will be much reduced at this point.

By applying this patch, %sys utilization falls to around 85% under the
same workload, and the number of ps processes executed per unit time
increases by 3x-4x.  Although this particular workload is a bit
contrived, we have seen some large collections of eager monitoring
scripts which produced similarly high %sys time due to contention in the
/proc directory.

As a result this patch, Al noted that several procfs methods which were
only called in ref-walk mode could now be called from RCU mode.  To
ensure that this patch is safe, I audited all the inode get_link and
permission() implementations, as well as dentry d_revalidate()
implementations, in fs/proc.  The purpose here is to ensure that they
either are safe to call in RCU (i.e.  don't sleep) or correctly bail out
of RCU mode if they don't support it.  My analysis shows that all
at-risk procfs methods are safe to call under RCU, and thus this patch
is safe.

Procfs RCU-walk Analysis:

This analysis is up-to-date with 5.15-rc3.  When called under RCU mode,
these functions have arguments as follows:

* get_link() receives a NULL dentry pointer when called in RCU mode.
* permission() receives MAY_NOT_BLOCK in the mode parameter when called
  from RCU.
* d_revalidate() receives LOOKUP_RCU in flags.

For the following functions, either they are trivially RCU safe, or they
explicitly bail at the beginning of the function when they run:

proc_ns_get_link       (bails out)
proc_get_link          (RCU safe)
proc_pid_get_link      (bails out)
map_files_d_revalidate (bails out)
map_misc_d_revalidate  (bails out)
proc_net_d_revalidate  (RCU safe)
proc_sys_revalidate    (bails out, also not under /proc/$pid)
tid_fd_revalidate      (bails out)
proc_sys_permission    (not under /proc/$pid)

The remainder of the functions require a bit more detail:

* proc_fd_permission: RCU safe. All of the body of this function is
  under rcu_read_lock(), except generic_permission() which declares
  itself RCU safe in its documentation string.
* proc_self_get_link uses GFP_ATOMIC in the RCU case, so it is RCU aware
  and otherwise looks safe. The same is true of proc_thread_self_get_link.
* proc_map_files_get_link: calls ns_capable, which calls capable(), and
  thus calls into the audit code (see note #1 below). The remainder is
  just a call to the trivially safe proc_pid_get_link().
* proc_pid_permission: calls ptrace_may_access(), which appears RCU
  safe, although it does call into the "security_ptrace_access_check()"
  hook, which looks safe under smack and selinux. Just the audit code is
  of concern. Also uses get_task_struct() and put_task_struct(), see
  note #2 below.
* proc_tid_comm_permission: Appears safe, though calls put_task_struct
  (see note #2 below).

Note #1:
  Most of the concern of RCU safety has centered around the audit code.
  However, since b17ec22f ("selinux: slow_avc_audit has become
  non-blocking"), it's safe to call this code under RCU. So all of the
  above are safe by my estimation.

Note #2: get_task_struct() and put_task_struct():
  The majority of get_task_struct() is under RCU read lock, and in any
  case it is a simple increment. But put_task_struct() is complex, given
  that it could at some point free the task struct, and this process has
  many steps which I couldn't manually verify. However, several other
  places call put_task_struct() under RCU, so it appears safe to use
  here too (see kernel/hung_task.c:165 or rcu/tree-stall.h:296)

Patch description:

pid_revalidate() drops from RCU into REF lookup mode.  When many threads
are resolving paths within /proc in parallel, this can result in heavy
spinlock contention on d_lockref as each thread tries to grab a
reference to the /proc dentry (and drop it shortly thereafter).

Investigation indicates that it is not necessary to drop RCU in
pid_revalidate(), as no RCU data is modified and the function never
sleeps.  So, remove the LOOKUP_RCU check.

Link: https://lkml.kernel.org/r/20211004175629.292270-2-stephen.s.brennan@oracle.comSigned-off-by: NStephen Brennan <stephen.s.brennan@oracle.com>
Cc: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Let's support multiple registered callbacks, making sure that
registering vmcore callbacks cannot fail.  Make the callback return a
bool instead of an int, handling how to deal with errors internally.
Drop unused HAVE_OLDMEM_PFN_IS_RAM.

We soon want to make use of this infrastructure from other drivers:
virtio-mem, registering one callback for each virtio-mem device, to
prevent reading unplugged virtio-mem memory.

Handle it via a generic vmcore_cb structure, prepared for future
extensions: for example, once we support virtio-mem on s390x where the
vmcore is completely constructed in the second kernel, we want to detect
and add plugged virtio-mem memory ranges to the vmcore in order for them
to get dumped properly.

Handle corner cases that are unexpected and shouldn't happen in sane
setups: registering a callback after the vmcore has already been opened
(warn only) and unregistering a callback after the vmcore has already been
opened (warn and essentially read only zeroes from that point on).

Link: https://lkml.kernel.org/r/20211005121430.30136-6-david@redhat.comSigned-off-by: NDavid Hildenbrand <david@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The callback should deal with errors internally, it doesn't make sense
to expose these via pfn_is_ram().  We'll rework the callbacks next.
Right now we consider errors as if "it's RAM"; no functional change.

Link: https://lkml.kernel.org/r/20211005121430.30136-5-david@redhat.comSigned-off-by: NDavid Hildenbrand <david@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

If a task exits concurrently, task_pid_nr_ns may return 0.

[akpm@linux-foundation.org: coding style tweaks]
[adobriyan@gmail.com: test that /proc/*/task doesn't contain "0"]
  Link: https://lkml.kernel.org/r/YV88AnVzHxPafQ9o@localhost.localdomain

Link: https://lkml.kernel.org/r/8735pn5dx7.fsf@oldenburg.str.redhat.comSigned-off-by: NFlorian Weimer <fweimer@redhat.com>
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Acked-by: NChristian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: NAlexey Dobriyan <adobriyan@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Commit 21a3c273 ("mm, hugetlb: add thread name and pid to
SHM_HUGETLB mlock rlimit warning") marked this as deprecated in 2012,
but it is not deleted yet.

Mike says he still sees that message in log files on occasion, so maybe we
should preserve this warning.

Also remove hugetlbfs related user_shm_unlock in ipc/shm.c and remove the
user_shm_unlock after out.

Link: https://lkml.kernel.org/r/20211103105857.25041-1-zhangyiru3@huawei.comSigned-off-by: Nzhangyiru <zhangyiru3@huawei.com>
Reviewed-by: NMike Kravetz <mike.kravetz@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Liu Zixian <liuzixian4@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: wuxu.wu <wuxu.wu@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Historically (pre-2.5), the inode shrinker used to reclaim only empty
inodes and skip over those that still contained page cache.  This caused
problems on highmem hosts: struct inode could put fill lowmem zones
before the cache was getting reclaimed in the highmem zones.

To address this, the inode shrinker started to strip page cache to
facilitate reclaiming lowmem.  However, this comes with its own set of
problems: the shrinkers may drop actively used page cache just because
the inodes are not currently open or dirty - think working with a large
git tree.  It further doesn't respect cgroup memory protection settings
and can cause priority inversions between containers.

Nowadays, the page cache also holds non-resident info for evicted cache
pages in order to detect refaults.  We've come to rely heavily on this
data inside reclaim for protecting the cache workingset and driving swap
behavior.  We also use it to quantify and report workload health through
psi.  The latter in turn is used for fleet health monitoring, as well as
driving automated memory sizing of workloads and containers, proactive
reclaim and memory offloading schemes.

The consequences of dropping page cache prematurely is that we're seeing
subtle and not-so-subtle failures in all of the above-mentioned
scenarios, with the workload generally entering unexpected thrashing
states while losing the ability to reliably detect it.

To fix this on non-highmem systems at least, going back to rotating
inodes on the LRU isn't feasible.  We've tried (commit a76cf1a4
("mm: don't reclaim inodes with many attached pages")) and failed
(commit 69056ee6 ("Revert "mm: don't reclaim inodes with many
attached pages"")).

The issue is mostly that shrinker pools attract pressure based on their
size, and when objects get skipped the shrinkers remember this as
deferred reclaim work.  This accumulates excessive pressure on the
remaining inodes, and we can quickly eat into heavily used ones, or
dirty ones that require IO to reclaim, when there potentially is plenty
of cold, clean cache around still.

Instead, this patch keeps populated inodes off the inode LRU in the
first place - just like an open file or dirty state would.  An otherwise
clean and unused inode then gets queued when the last cache entry
disappears.  This solves the problem without reintroducing the reclaim
issues, and generally is a bit more scalable than having to wade through
potentially hundreds of thousands of busy inodes.

Locking is a bit tricky because the locks protecting the inode state
(i_lock) and the inode LRU (lru_list.lock) don't nest inside the
irq-safe page cache lock (i_pages.xa_lock).  Page cache deletions are
serialized through i_lock, taken before the i_pages lock, to make sure
depopulated inodes are queued reliably.  Additions may race with
deletions, but we'll check again in the shrinker.  If additions race
with the shrinker itself, we're protected by the i_lock: if find_inode()
or iput() win, the shrinker will bail on the elevated i_count or
I_REFERENCED; if the shrinker wins and goes ahead with the inode, it
will set I_FREEING and inhibit further igets(), which will cause the
other side to create a new instance of the inode instead.

Link: https://lkml.kernel.org/r/20210614211904.14420-4-hannes@cmpxchg.orgSigned-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When we pass in zero as an io-wq worker number limit it shouldn't
actually change the limits but return the old value, follow that
behaviour with deferred limits setup as well.

Cc: stable@kernel.org # 5.15
Reported-by: NBeld Zhang <beldzhang@gmail.com>
Fixes: e139a1ec ("io_uring: apply max_workers limit to all future users")
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1b222a92f7a78a24b042763805e891a4cdd4b544.1636384034.git.asml.silence@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

When truncating pagecache on file THP, the private pages of a process
should not be unmapped mapping.  This incorrect behavior on a dynamic
shared libraries which will cause related processes to happen core dump.

A simple test for a DSO (Prerequisite is the DSO mapped in file THP):

    int main(int argc, char *argv[])
    {
	int fd;

	fd = open(argv[1], O_WRONLY);
	if (fd < 0) {
		perror("open");
	}

	close(fd);
	return 0;
    }

The test only to open a target DSO, and do nothing.  But this operation
will lead one or more process to happen core dump.  This patch mainly to
fix this bug.

Link: https://lkml.kernel.org/r/20211025092134.18562-3-rongwei.wang@linux.alibaba.com
Fixes: eb6ecbed ("mm, thp: relax the VM_DENYWRITE constraint on file-backed THPs")
Signed-off-by: NRongwei Wang <rongwei.wang@linux.alibaba.com>
Tested-by: NXu Yu <xuyu@linux.alibaba.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Collin Fijalkovich <cfijalkovich@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch series "fix two bugs for file THP".

This patch (of 2):

Transparent huge page has supported read-only non-shmem files.  The
file- backed THP is collapsed by khugepaged and truncated when written
(for shared libraries).

However, there is a race when multiple writers truncate the same page
cache concurrently.

In that case, subpage(s) of file THP can be revealed by find_get_entry
in truncate_inode_pages_range, which will trigger PageTail BUG_ON in
truncate_inode_page, as follows:

    page:000000009e420ff2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x7ff pfn:0x50c3ff
    head:0000000075ff816d order:9 compound_mapcount:0 compound_pincount:0
    flags: 0x37fffe0000010815(locked|uptodate|lru|arch_1|head)
    raw: 37fffe0000000000 fffffe0013108001 dead000000000122 dead000000000400
    raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
    head: 37fffe0000010815 fffffe001066bd48 ffff000404183c20 0000000000000000
    head: 0000000000000600 0000000000000000 00000001ffffffff ffff000c0345a000
    page dumped because: VM_BUG_ON_PAGE(PageTail(page))
    ------------[ cut here ]------------
    kernel BUG at mm/truncate.c:213!
    Internal error: Oops - BUG: 0 [#1] SMP
    Modules linked in: xfs(E) libcrc32c(E) rfkill(E) ...
    CPU: 14 PID: 11394 Comm: check_madvise_d Kdump: ...
    Hardware name: ECS, BIOS 0.0.0 02/06/2015
    pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
    Call trace:
     truncate_inode_page+0x64/0x70
     truncate_inode_pages_range+0x550/0x7e4
     truncate_pagecache+0x58/0x80
     do_dentry_open+0x1e4/0x3c0
     vfs_open+0x38/0x44
     do_open+0x1f0/0x310
     path_openat+0x114/0x1dc
     do_filp_open+0x84/0x134
     do_sys_openat2+0xbc/0x164
     __arm64_sys_openat+0x74/0xc0
     el0_svc_common.constprop.0+0x88/0x220
     do_el0_svc+0x30/0xa0
     el0_svc+0x20/0x30
     el0_sync_handler+0x1a4/0x1b0
     el0_sync+0x180/0x1c0
    Code: aa0103e0 900061e1 910ec021 9400d300 (d4210000)

This patch mainly to lock filemap when one enter truncate_pagecache(),
avoiding truncating the same page cache concurrently.

Link: https://lkml.kernel.org/r/20211025092134.18562-1-rongwei.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/20211025092134.18562-2-rongwei.wang@linux.alibaba.com
Fixes: eb6ecbed ("mm, thp: relax the VM_DENYWRITE constraint on file-backed THPs")
Signed-off-by: NXu Yu <xuyu@linux.alibaba.com>
Signed-off-by: NRongwei Wang <rongwei.wang@linux.alibaba.com>
Suggested-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: NSong Liu <song@kernel.org>
Cc: Collin Fijalkovich <cfijalkovich@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add a new SB_I_ flag to mark superblocks that have an ephemeral bdi
associated with them, and unregister it when the superblock is shut
down.

Link: https://lkml.kernel.org/r/20211021124441.668816-4-hch@lst.deSigned-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJan Kara <jack@suse.cz>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Firstly, check_shmem_swap variable is actually not necessary, because
it's always set with pte_hole hook; checking each would work.

Meanwhile, the check within smaps_pte_entry is not easy to follow.
E.g., pte_none() check is not needed as "!pte_present && !is_swap_pte"
is the same.  Since at it, use the pte_hole() helper rather than dup the
page cache lookup.

Still keep the CONFIG_SHMEM part so the code can be optimized to nop for
!SHMEM.

There will be a very slight functional change in smaps_pte_entry(), that
for !SHMEM we'll return early for pte_none (before checking page==NULL),
but that's even nicer.

Link: https://lkml.kernel.org/r/20210917164756.8586-4-peterx@redhat.comSigned-off-by: NPeter Xu <peterx@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch series "mm/smaps: Fixes and optimizations on shmem swap handling".

This patch (of 3):

The shmem swap calculation on the privately writable mappings are using
wrong parameters as spotted by Vlastimil.  Fix them.  This was
introduced in commit 48131e03 ("mm, proc: reduce cost of
/proc/pid/smaps for unpopulated shmem mappings"), when shmem_swap_usage
was reworked to shmem_partial_swap_usage.

Test program:

  void main(void)
  {
      char *buffer, *p;
      int i, fd;

      fd = memfd_create("test", 0);
      assert(fd > 0);

      /* isize==2M*3, fill in pages, swap them out */
      ftruncate(fd, SIZE_2M * 3);
      buffer = mmap(NULL, SIZE_2M * 3, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
      assert(buffer);
      for (i = 0, p = buffer; i < SIZE_2M * 3 / 4096; i++) {
          *p = 1;
          p += 4096;
      }
      madvise(buffer, SIZE_2M * 3, MADV_PAGEOUT);
      munmap(buffer, SIZE_2M * 3);

      /*
       * Remap with private+writtable mappings on partial of the inode (<= 2M*3),
       * while the size must also be >= 2M*2 to make sure there's a none pmd so
       * smaps_pte_hole will be triggered.
       */
      buffer = mmap(NULL, SIZE_2M * 2, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
      printf("pid=%d, buffer=%p\n", getpid(), buffer);

      /* Check /proc/$PID/smap_rollup, should see 4MB swap */
      sleep(1000000);
  }

Before the patch, smaps_rollup shows <4MB swap and the number will be
random depending on the alignment of the buffer of mmap() allocated.
After this patch, it'll show 4MB.

Link: https://lkml.kernel.org/r/20210917164756.8586-1-peterx@redhat.com
Link: https://lkml.kernel.org/r/20210917164756.8586-2-peterx@redhat.com
Fixes: 48131e03 ("mm, proc: reduce cost of /proc/pid/smaps for unpopulated shmem mappings")
Signed-off-by: NPeter Xu <peterx@redhat.com>
Reported-by: NVlastimil Babka <vbabka@suse.cz>
Reviewed-by: NVlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Kernel doc validator complains:
  Function parameter or member 'p' not described in 'prepend_name'
  Excess function parameter 'buffer' description in 'prepend_name'

Link: https://lkml.kernel.org/r/20211011005614.26189-1-justin.he@arm.com
Fixes: ad08ae58 ("d_path: introduce struct prepend_buffer")
Signed-off-by: NJia He <justin.he@arm.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The fallthrough comment for an ignored cmpxchg() return value produces a
harmless warning with 'make W=1':

  fs/posix_acl.c: In function 'get_acl':
  fs/posix_acl.c:127:36: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
    127 |                 /* fall through */ ;
        |                                    ^

Simplify it as a step towards a clean W=1 build.  As all architectures
define cmpxchg() as a statement expression these days, it is no longer
necessary to evaluate its return code, and the if() can just be droped.

Link: https://lkml.kernel.org/r/20210927102410.1863853-1-arnd@kernel.org
Link: https://lore.kernel.org/all/20210322132103.qiun2rjilnlgztxe@wittgenstein/Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NChristian Brauner <christian.brauner@ubuntu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: James Morris <jamorris@linux.microsoft.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

ocfs2_zero_range_for_truncate() can try to zero pages beyond current
inode size despite the fact that underlying blocks should be already
zeroed out and writeback will skip writing such pages anyway.  Avoid the
pointless work.

Link: https://lkml.kernel.org/r/20211025151332.11301-2-jack@suse.czSigned-off-by: NJan Kara <jack@suse.cz>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Patch series "ocfs2: Truncate data corruption fix".

As further testing has shown, commit 5314454e ("ocfs2: fix data
corruption after conversion from inline format") didn't fix all the data
corruption issues the customer started observing after 6dbf7bb5
("fs: Don't invalidate page buffers in block_write_full_page()") This
time I have tracked them down to two bugs in ocfs2 truncation code.

One bug (truncating page cache before clearing tail cluster and setting
i_size) could cause data corruption even before 6dbf7bb5, but before
that commit it needed a race with page fault, after 6dbf7bb5 it
started to be pretty deterministic.

Another bug (zeroing pages beyond old i_size) used to be harmless
inefficiency before commit 6dbf7bb5.  But after commit 6dbf7bb5
in combination with the first bug it resulted in deterministic data
corruption.

Although fixing only the first problem is needed to stop data
corruption, I've fixed both issues to make the code more robust.

This patch (of 2):

ocfs2_truncate_file() did unmap invalidate page cache pages before
zeroing partial tail cluster and setting i_size.  Thus some pages could
be left (and likely have left if the cluster zeroing happened) in the
page cache beyond i_size after truncate finished letting user possibly
see stale data once the file was extended again.  Also the tail cluster
zeroing was not guaranteed to finish before truncate finished causing
possible stale data exposure.  The problem started to be particularly
easy to hit after commit 6dbf7bb5 "fs: Don't invalidate page buffers
in block_write_full_page()" stopped invalidation of pages beyond i_size
from page writeback path.

Fix these problems by unmapping and invalidating pages in the page cache
after the i_size is reduced and tail cluster is zeroed out.

Link: https://lkml.kernel.org/r/20211025150008.29002-1-jack@suse.cz
Link: https://lkml.kernel.org/r/20211025151332.11301-1-jack@suse.cz
Fixes: ccd979bd ("[PATCH] OCFS2: The Second Oracle Cluster Filesystem")
Signed-off-by: NJan Kara <jack@suse.cz>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The variable ret is being assigned a value that is never read, it is
updated later on with a different value.  The assignment is redundant
and can be removed.

Addresses-Coverity: ("Unused value")
Link: https://lkml.kernel.org/r/20211007233452.30815-1-colin.king@canonical.comSigned-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Allocate and free struct ocfs2_journal in ocfs2_journal_init and
ocfs2_journal_shutdown.  Init and release of system inodes references
the journal so reorder calls to make sure they work correctly.

Link: https://lkml.kernel.org/r/20211009145006.3478-1-vvidic@valentin-vidic.from.hrSigned-off-by: NValentin Vidic <vvidic@valentin-vidic.from.hr>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The reference counting issue happens in two exception handling paths of
ocfs2_replay_truncate_records().  When executing these two exception
handling paths, the function forgets to decrease the refcount of handle
increased by ocfs2_start_trans(), causing a refcount leak.

Fix this issue by using ocfs2_commit_trans() to decrease the refcount of
handle in two handling paths.

Link: https://lkml.kernel.org/r/20210908102055.10168-1-cymi20@fudan.edu.cnSigned-off-by: NChenyuan Mi <cymi20@fudan.edu.cn>
Signed-off-by: NXiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: NXin Tan <tanxin.ctf@gmail.com>
Reviewed-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Wengang Wang <wen.gang.wang@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In debugging user problems with ip address/DNS issues with
smb3 mounts, we sometimes needed additional info on the hostname
and ip address.

Add two tracepoints, one to show socket connection success
and one for failures to connect to the socket.

Sample output:
      mount.cifs-14551   [005] .....  7636.547906: smb3_connect_done: conn_id=0x1 server=localhost addr=127.0.0.1:445
      mount.cifs-14558   [004] .....  7642.405413: smb3_connect_done: conn_id=0x2 server=smfrench.file.core.windows.net addr=52.239.158.232:445
      mount.cifs-14741   [005] .....  7818.490716: smb3_connect_done: conn_id=0x3 server=::1 addr=[::1]:445/0%0
      mount.cifs-14810   [000] .....  7966.380337: smb3_connect_err: rc=-101 conn_id=0x4 server=::2 addr=[::2]:445/0%0
      mount.cifs-14810   [000] .....  7966.380356: smb3_connect_err: rc=-101 conn_id=0x4 server=::2 addr=[::2]:139/0%0
      mount.cifs-14818   [003] .....  7986.771992: smb3_connect_done: conn_id=0x5 server=127.0.0.9 addr=127.0.0.9:445
      mount.cifs-14825   [008] .....  8008.178109: smb3_connect_err: rc=-115 conn_id=0x6 server=124.23.0.9 addr=124.23.0.9:445
      mount.cifs-14825   [008] .....  8013.298085: smb3_connect_err: rc=-115 conn_id=0x6 server=124.23.0.9 addr=124.23.0.9:139
           cifsd-14553   [006] .....  8036.735615: smb3_reconnect: conn_id=0x1 server=localhost current_mid=32
           cifsd-14743   [010] .....  8036.735644: smb3_reconnect: conn_id=0x3 server=::1 current_mid=29
           cifsd-14743   [010] .....  8039.921740: smb3_connect_err: rc=-111 conn_id=0x3 server=::1 addr=[::1]:445/0%0
           cifsd-14553   [008] .....  8042.993894: smb3_connect_err: rc=-111 conn_id=0x1 server=localhost addr=127.0.0.1:445
           cifsd-14743   [010] .....  8042.993894: smb3_connect_err: rc=-111 conn_id=0x3 server=::1 addr=[::1]:445/0%0
           cifsd-14553   [008] .....  8046.065824: smb3_connect_err: rc=-111 conn_id=0x1 server=localhost addr=127.0.0.1:445
           cifsd-14743   [010] .....  8046.065824: smb3_connect_err: rc=-111 conn_id=0x3 server=::1 addr=[::1]:445/0%0
           cifsd-14553   [008] .....  8049.137796: smb3_connect_done: conn_id=0x1 server=localhost addr=127.0.0.1:445
           cifsd-14743   [010] .....  8049.137796: smb3_connect_done: conn_id=0x3 server=::1 addr=[::1]:445/0%0
Reviewed-by: NPaulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: NSteve French <stfrench@microsoft.com>

The kernel test robot correctly identifies that we store sqe twice,
remove the earlier one that is done before validating the index.

Fixes: f75d1183 ("io_uring: harder fdinfo sq/cq ring iterating")
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Move all SMB2_Create definitions (except contexts) into the shared area.
Signed-off-by: NRonnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: NNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: NSteve French <stfrench@microsoft.com>

Move SMB2_SessionSetup, SMB2_Close, SMB2_Read, SMB2_Write and
SMB2_ChangeNotify commands into smbfs_common/smb2pdu.h
Signed-off-by: NRonnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: NNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: NSteve French <stfrench@microsoft.com>