Until then erofs is exactly blockdev based filesystem.

A new fscache-based mode is going to be introduced for erofs to support
scenarios where on-demand read semantics is needed, e.g. container
image distribution. In this case, erofs could be mounted from data blobs
through fscache.

Add a helper checking which mode erofs works in, and twist the code in
preparation for the upcoming fscache mode.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-11-jefflexu@linux.alibaba.comAcked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

... so that it can be used in the following introduced fscache mode.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-10-jefflexu@linux.alibaba.comAcked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Document new user interface introduced by on-demand read mode.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-9-jefflexu@linux.alibaba.comAcked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Add tracepoints for on-demand read mode. Currently following tracepoints
are added:

	OPEN request / COPEN reply
	CLOSE request
	READ request / CREAD reply
	write through anonymous fd
	release of anonymous fd
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20220425122143.56815-8-jefflexu@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Enable on-demand read mode by adding an optional parameter to the "bind"
command.

On-demand mode will be turned on when this parameter is "ondemand", i.e.
"bind ondemand". Otherwise cachefiles will work in the original mode.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-7-jefflexu@linux.alibaba.comAcked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Implement the data plane of on-demand read mode.

The early implementation [1] place the entry to
cachefiles_ondemand_read() in fscache_read(). However, fscache_read()
can only detect if the requested file range is fully cache miss, whilst
we need to notify the user daemon as long as there's a hole inside the
requested file range.

Thus the entry is now placed in cachefiles_prepare_read(). When working
in on-demand read mode, once a hole detected, the read routine will send
a READ request to the user daemon. The user daemon needs to fetch the
data and write it to the cache file. After sending the READ request, the
read routine will hang there, until the READ request is handled by the
user daemon. Then it will retry to read from the same file range. If no
progress encountered, the read routine will fail then.

A new NETFS_SREQ_ONDEMAND flag is introduced to indicate that on-demand
read should be done when a cache miss encountered.

[1] https://lore.kernel.org/all/20220406075612.60298-6-jefflexu@linux.alibaba.com/ #v8
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20220425122143.56815-6-jefflexu@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Notify the user daemon that cookie is going to be withdrawn, providing a
hint that the associated anonymous fd can be closed.

Be noted that this is only a hint. The user daemon may close the
associated anonymous fd when receiving the CLOSE request, then it will
receive another anonymous fd when the cookie gets looked up. Or it may
ignore the CLOSE request, and keep writing data through the anonymous
fd. However the next time the cookie gets looked up, the user daemon
will still receive another new anonymous fd.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20220425122143.56815-5-jefflexu@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Add a refcount to avoid the deadlock in on-demand read mode. The
on-demand read mode will pin the corresponding cachefiles object for
each anonymous fd. The cachefiles object is unpinned when the anonymous
fd gets closed. When the user daemon exits and the fd of
"/dev/cachefiles" device node gets closed, it will wait for all
cahcefiles objects getting withdrawn. Then if there's any anonymous fd
getting closed after the fd of the device node, the user daemon will
hang forever, waiting for all objects getting withdrawn.

To fix this, add a refcount indicating if there's any object pinned by
anonymous fds. The cachefiles cache gets unbound and withdrawn when the
refcount is decreased to 0. It won't change the behaviour of the
original mode, in which case the cachefiles cache gets unbound and
withdrawn as long as the fd of the device node gets closed.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-4-jefflexu@linux.alibaba.comAcked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Fscache/CacheFiles used to serve as a local cache for a remote
networking fs. A new on-demand read mode will be introduced for
CacheFiles, which can boost the scenario where on-demand read semantics
are needed, e.g. container image distribution.

The essential difference between these two modes is seen when a cache
miss occurs: In the original mode, the netfs will fetch the data from
the remote server and then write it to the cache file; in on-demand
read mode, fetching the data and writing it into the cache is delegated
to a user daemon.

As the first step, notify the user daemon when looking up cookie. In
this case, an anonymous fd is sent to the user daemon, through which the
user daemon can write the fetched data to the cache file. Since the user
daemon may move the anonymous fd around, e.g. through dup(), an object
ID uniquely identifying the cache file is also attached.

Also add one advisory flag (FSCACHE_ADV_WANT_CACHE_SIZE) suggesting that
the cache file size shall be retrieved at runtime. This helps the
scenario where one cache file contains multiple netfs files, e.g. for
the purpose of deduplication. In this case, netfs itself has no idea the
size of the cache file, whilst the user daemon should give the hint on
it.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-3-jefflexu@linux.alibaba.comAcked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Extract the generic routine of writing data to cache files, and make it
generally available.

This will be used by the following patch implementing on-demand read
mode. Since it's called inside CacheFiles module, make the interface
generic and unrelated to netfs_cache_resources.

It is worth noting that, ki->inval_counter is not initialized after
this cleanup. It shall not make any visible difference, since
inval_counter is no longer used in the write completion routine, i.e.
cachefiles_write_complete().
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20220425122143.56815-2-jefflexu@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

This patch enables idmapped mounts for erofs, since all dedicated helpers
for this functionality existsm, so, in this patch we just pass down the
user_namespace argument from the VFS methods to the relevant helpers.

Simple idmap example on erofs image:

1. mkdir dir
2. touch dir/file
3. mkfs.erofs erofs.img dir
4. mount -t erofs -o loop erofs.img  /mnt/erofs/

5. ls -ln /mnt/erofs/
total 0
-rw-rw-r-- 1 1000 1000 0 May 17 15:26 file

6. mount-idmapped --map-mount b:1000:1001:1 /mnt/erofs/ /mnt/scratch_erofs/

7. ls -ln /mnt/scratch_erofs/
total 0
-rw-rw-r-- 1 1001 1001 0 May 17 15:26 file
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Chao Yu <chao.yu@oppo.com>
Link: https://lore.kernel.org/r/20220517104103.3570721-1-chao@kernel.orgSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Implement export operations in order to make EROFS support accessing
inodes with filehandles so that it can be exported via NFS and used
by overlayfs.

Without this patch, 'exportfs -rv' will report:
exportfs: /root/erofs_mp does not support NFS export

Also tested with unionmount-testsuite and the testcase below passes now:
./run --ov --erofs --verify hard-link

For more details about the testcase, see:
https://github.com/amir73il/unionmount-testsuite/pull/6Signed-off-by: Hongnan Li <hongnan.li@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220425040712.91685-1-hongnan.li@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

I got some KASAN report as below:

[   46.959738] ==================================================================
[   46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370
[   46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188
...
[   46.960430] Call Trace:
[   46.960430]  <TASK>
[   46.960430]  dump_stack_lvl+0x41/0x5e
[   46.960430]  print_report.cold+0xb2/0x6b7
[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370
[   46.960430]  kasan_report+0x8a/0x140
[   46.960430]  ? z_erofs_shifted_transform+0x2bd/0x370
[   46.960430]  kasan_check_range+0x14d/0x1d0
[   46.960430]  memcpy+0x20/0x60
[   46.960430]  z_erofs_shifted_transform+0x2bd/0x370
[   46.960430]  z_erofs_decompress_pcluster+0xaae/0x1080

The root cause is that the tail pcluster won't be a complete filesystem
block anymore. So if ztailpacking is used, the second part of an
uncompressed tail pcluster may not be ``rq->pageofs_out``.

Fixes: ab749bad ("erofs: support unaligned data decompression")
Fixes: cecf864d ("erofs: support inline data decompression")
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220512115833.24175-1-hsiangkao@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Fix some outdated comments and typos, hopefully helpful.

Link: https://lore.kernel.org/r/20220506194612.117120-3-hsiangkao@linux.alibaba.comReviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Some comments haven't been useful anymore since the code updated.
Let's drop them instead.

Link: https://lore.kernel.org/r/20220506194612.117120-2-hsiangkao@linux.alibaba.comReviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

The big pcluster feature has been merged for a year, it has been mostly
stable now.
Signed-off-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220407050505.12683-1-huyue2@coolpad.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Pull scheduler fix from Borislav Petkov:

 - Fix a corner case when calculating sched runqueue variables

That fix also removes a check for a zero divisor in the code, without
mentioning it.  Vincent clarified that it's ok after I whined about it:

  https://lore.kernel.org/all/CAKfTPtD2QEyZ6ADd5WrwETMOX0XOwJGnVddt7VHgfURdqgOS-Q@mail.gmail.com/

* tag 'sched_urgent_for_v5.18_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/pelt: Fix attach_entity_load_avg() corner case

Pull powerpc fixes from Michael Ellerman:

 - Partly revert a change to our timer_interrupt() that caused lockups
   with high res timers disabled.

 - Fix a bug in KVM TCE handling that could corrupt kernel memory.

 - Two commits fixing Power9/Power10 perf alternative event selection.

Thanks to Alexey Kardashevskiy, Athira Rajeev, David Gibson, Frederic
Barrat, Madhavan Srinivasan, Miguel Ojeda, and Nicholas Piggin.

* tag 'powerpc-5.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/perf: Fix 32bit compile
  powerpc/perf: Fix power10 event alternatives
  powerpc/perf: Fix power9 event alternatives
  KVM: PPC: Fix TCE handling for VFIO
  powerpc/time: Always set decrementer in timer_interrupt()

Pull perf fixes from Borislav Petkov:

 - Add Sapphire Rapids CPU support

 - Fix a perf vmalloc-ed buffer mapping error (PERF_USE_VMALLOC in use)

* tag 'perf_urgent_for_v5.18_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/cstate: Add SAPPHIRERAPIDS_X CPU support
  perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled

Pull EDAC fix from Borislav Petkov:

 - Read the reported error count from the proper register on
   synopsys_edac

* tag 'edac_urgent_for_v5.18_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
  EDAC/synopsys: Read the error count from the correct register

Since commit 559089e0 ("vmalloc: replace VM_NO_HUGE_VMAP with
VM_ALLOW_HUGE_VMAP"), the use of hugepage mappings for vmalloc is an
opt-in strategy, because it caused a number of problems that weren't
noticed until x86 enabled it too.

One of the issues was fixed by Nick Piggin in commit 3b8000ae
("mm/vmalloc: huge vmalloc backing pages should be split rather than
compound"), but I'm still worried about page protection issues, and
VM_FLUSH_RESET_PERMS in particular.

However, like the hash table allocation case (commit f2edd118:
"page_alloc: use vmalloc_huge for large system hash"), the use of
kvmalloc() should be safe from any such games, since the returned
pointer might be a SLUB allocation, and as such no user should
reasonably be using it in any odd ways.

We also know that the allocations are fairly large, since it falls back
to the vmalloc case only when a kmalloc() fails.  So using a hugepage
mapping seems both safe and relevant.

This patch does show a weakness in the opt-in strategy: since the opt-in
flag is in the 'vm_flags', not the usual gfp_t allocation flags, very
few of the usual interfaces actually expose it.

That's not much of an issue in this case that already used one of the
fairly specialized low-level vmalloc interfaces for the allocation, but
for a lot of other vmalloc() users that might want to opt in, it's going
to be very inconvenient.

We'll either have to fix any compatibility problems, or expose it in the
gfp flags (__GFP_COMP would have made a lot of sense) to allow normal
vmalloc() users to use hugepage mappings.  That said, the cases that
really matter were probably already taken care of by the hash tabel
allocation.

Link: https://lore.kernel.org/all/20220415164413.2727220-1-song@kernel.org/
Link: https://lore.kernel.org/all/CAHk-=whao=iosX1s5Z4SF-ZGa-ebAukJoAdUJFk5SPwnofV+Vg@mail.gmail.com/
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Song Liu <songliubraving@fb.com>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use vmalloc_huge() in alloc_large_system_hash() so that large system
hash (>= PMD_SIZE) could benefit from huge pages.

Note that vmalloc_huge only allocates huge pages for systems with
HAVE_ARCH_HUGE_VMALLOC.
Signed-off-by: Song Liu <song@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull ksmbd server fixes from Steve French:

 - cap maximum sector size reported to avoid mount problems

 - reference count fix

 - fix filename rename race

* tag '5.18-rc3-ksmbd-fixes' of git://git.samba.org/ksmbd:
  ksmbd: set fixed sector size to FS_SECTOR_SIZE_INFORMATION
  ksmbd: increment reference count of parent fp
  ksmbd: remove filename in ksmbd_file

Pull ARC fixes from Vineet Gupta:

 - Assorted fixes

* tag 'arc-5.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: remove redundant READ_ONCE() in cmpxchg loop
  ARC: atomic: cleanup atomic-llsc definitions
  arc: drop definitions of pgd_index() and pgd_offset{, _k}() entirely
  ARC: dts: align SPI NOR node name with dtschema
  ARC: Remove a redundant memset()
  ARC: fix typos in comments
  ARC: entry: fix syscall_trace_exit argument

Pull SCSI fix from James Bottomley:
 "One fix for an information leak caused by copying a buffer to
  userspace without checking for error first in the sr driver"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: sr: Do not leak information in ioctl

Pull xen fixes from Juergen Gross:
 "A simple cleanup patch and a refcount fix for Xen on Arm"

* tag 'for-linus-5.18-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  arm/xen: Fix some refcount leaks
  xen: Convert kmap() to kmap_local_page()

Pull more drm fixes from Dave Airlie:
 "Maarten was away, so Maxine stepped up and sent me the drm-fixes
  merge, so no point leaving it for another week.

  The big change is an OF revert around bridge/panels, it may have some
  driver fallout, but hopefully this revert gets them shook out in the
  next week easier.

  Otherwise it's a bunch of locking/refcounts across drivers, a radeon
  dma_resv logic fix and some raspberry pi panel fixes.

  panel:
   - revert of patch that broke panel/bridge issues

  dma-buf:
   - remove unused header file.

  amdgpu:
   - partial revert of locking change

  radeon:
   - fix dma_resv logic inversion

  panel:
   - pi touchscreen panel init fixes

  vc4:
   - build fix
   - runtime pm refcount fix

  vmwgfx:
   - refcounting fix"

* tag 'drm-fixes-2022-04-23' of git://anongit.freedesktop.org/drm/drm:
  drm/amdgpu: partial revert "remove ctx->lock" v2
  Revert "drm: of: Lookup if child node has panel or bridge"
  Revert "drm: of: Properly try all possible cases for bridge/panel detection"
  drm/vc4: Use pm_runtime_resume_and_get to fix pm_runtime_get_sync() usage
  drm/vmwgfx: Fix gem refcounting and memory evictions
  drm/vc4: Fix build error when CONFIG_DRM_VC4=y && CONFIG_RASPBERRYPI_FIRMWARE=m
  drm/panel/raspberrypi-touchscreen: Initialise the bridge in prepare
  drm/panel/raspberrypi-touchscreen: Avoid NULL deref if not initialised
  dma-buf-map: remove renamed header file
  drm/radeon: fix logic inversion in radeon_sync_resv

Pull input fixes from Dmitry Torokhov:

 - a new set of keycodes to be used by marine navigation systems

 - minor fixes to omap4-keypad and cypress-sf drivers

* tag 'input-for-v5.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: add Marine Navigation Keycodes
  Input: omap4-keypad - fix pm_runtime_get_sync() error checking
  Input: cypress-sf - register a callback to disable the regulators

Pull block fixes from Jens Axboe:
 "Just two small regression fixes for bcache"

* tag 'block-5.18-2022-04-22' of git://git.kernel.dk/linux-block:
  bcache: fix wrong bdev parameter when calling bio_alloc_clone() in do_bio_hook()
  bcache: put bch_bio_map() back to correct location in journal_write_unlocked()

Pull io_uring fixes from Jens Axboe:
 "Just two small fixes - one fixing a potential leak for the iovec for
  larger requests added in this cycle, and one fixing a theoretical leak
  with CQE_SKIP and IOPOLL"

* tag 'io_uring-5.18-2022-04-22' of git://git.kernel.dk/linux-block:
  io_uring: fix leaks on IOPOLL and CQE_SKIP
  io_uring: free iovec if file assignment fails

Merge tag 'perf-tools-fixes-for-v5.18-2022-04-22' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

Pull perf tools fixes from Arnaldo Carvalho de Melo:

 - Fix header include for LLVM >= 14 when building with libclang.

 - Allow access to 'data_src' for auxtrace in 'perf script' with ARM SPE
   perf.data files, fixing processing data with such attributes.

 - Fix error message for test case 71 ("Convert perf time to TSC") on
   s390, where it is not supported.

* tag 'perf-tools-fixes-for-v5.18-2022-04-22' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
  perf test: Fix error message for test case 71 on s390, where it is not supported
  perf report: Set PERF_SAMPLE_DATA_SRC bit for Arm SPE event
  perf script: Always allow field 'data_src' for auxtrace
  perf clang: Fix header include for LLVM >= 14

Add a struct page forward declaration to cacheflush_32.h.
Fixes this build warning:

    CC      drivers/crypto/xilinx/zynqmp-sha.o
  In file included from arch/sparc/include/asm/cacheflush.h:11,
                   from include/linux/cacheflush.h:5,
                   from drivers/crypto/xilinx/zynqmp-sha.c:6:
  arch/sparc/include/asm/cacheflush_32.h:38:37: warning: 'struct page' declared inside parameter list will not be visible outside of this definition or declaration
     38 | void sparc_flush_page_to_ram(struct page *page);

Exposed by commit 0e03b8fd ("crypto: xilinx - Turn SHA into a
tristate and allow COMPILE_TEST") but not Fixes: that commit because the
underlying problem is older.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: sparclinux@vger.kernel.org
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Two fixes for the raspberrypi panel initialisation, one fix for a logic
inversion in radeon, a build and pm refcounting fix for vc4, two reverts
for drm_of_get_bridge that caused a number of regression and a locking
regression for amdgpu.
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220422084403.2xrhf3jusdej5yo4@houat

Pull ext4 fixes from Ted Ts'o:
 "Fix some syzbot-detected bugs, as well as other bugs found by I/O
  injection testing.

  Change ext4's fallocate to consistently drop set[ug]id bits when an
  fallocate operation might possibly change the user-visible contents of
  a file.

  Also, improve handling of potentially invalid values in the the
  s_overhead_cluster superblock field to avoid ext4 returning a negative
  number of free blocks"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  jbd2: fix a potential race while discarding reserved buffers after an abort
  ext4: update the cached overhead value in the superblock
  ext4: force overhead calculation if the s_overhead_cluster makes no sense
  ext4: fix overhead calculation to account for the reserved gdt blocks
  ext4, doc: fix incorrect h_reserved size
  ext4: limit length to bitmap_maxbytes - blocksize in punch_hole
  ext4: fix use-after-free in ext4_search_dir
  ext4: fix bug_on in start_this_handle during umount filesystem
  ext4: fix symlink file size not match to file content
  ext4: fix fallocate to use file_modified to update permissions consistently

Pull ATA fix from Damien Le Moal:
 "A single fix to avoid a NULL pointer dereference in the pata_marvell
  driver with adapters not supporting DMA, from Zheyu"

* tag 'ata-5.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
  ata: pata_marvell: Check the 'bmdma_addr' beforing reading

Pull kvm fixes from Paolo Bonzini:
 "The main and larger change here is a workaround for AMD's lack of
  cache coherency for encrypted-memory guests.

  I have another patch pending, but it's waiting for review from the
  architecture maintainers.

  RISC-V:

   - Remove 's' & 'u' as valid ISA extension

   - Do not allow disabling the base extensions 'i'/'m'/'a'/'c'

  x86:

   - Fix NMI watchdog in guests on AMD

   - Fix for SEV cache incoherency issues

   - Don't re-acquire SRCU lock in complete_emulated_io()

   - Avoid NULL pointer deref if VM creation fails

   - Fix race conditions between APICv disabling and vCPU creation

   - Bugfixes for disabling of APICv

   - Preserve BSP MSR_KVM_POLL_CONTROL across suspend/resume

  selftests:

   - Do not use bitfields larger than 32-bits, they differ between GCC
     and clang"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvm: selftests: introduce and use more page size-related constants
  kvm: selftests: do not use bitfields larger than 32-bits for PTEs
  KVM: SEV: add cache flush to solve SEV cache incoherency issues
  KVM: SVM: Flush when freeing encrypted pages even on SME_COHERENT CPUs
  KVM: SVM: Simplify and harden helper to flush SEV guest page(s)
  KVM: selftests: Silence compiler warning in the kvm_page_table_test
  KVM: x86/pmu: Update AMD PMC sample period to fix guest NMI-watchdog
  x86/kvm: Preserve BSP MSR_KVM_POLL_CONTROL across suspend/resume
  KVM: SPDX style and spelling fixes
  KVM: x86: Skip KVM_GUESTDBG_BLOCKIRQ APICv update if APICv is disabled
  KVM: x86: Pend KVM_REQ_APICV_UPDATE during vCPU creation to fix a race
  KVM: nVMX: Defer APICv updates while L2 is active until L1 is active
  KVM: x86: Tag APICv DISABLE inhibit, not ABSENT, if APICv is disabled
  KVM: Initialize debugfs_dentry when a VM is created to avoid NULL deref
  KVM: Add helpers to wrap vcpu->srcu_idx and yell if it's abused
  KVM: RISC-V: Use kvm_vcpu.srcu_idx, drop RISC-V's unnecessary copy
  KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()
  RISC-V: KVM: Restrict the extensions that can be disabled
  RISC-V: KVM: Remove 's' & 'u' as valid ISA extension

Test case 71 'Convert perf time to TSC' is not supported on s390.

Subtest 71.1 is skipped with the correct message, but subtest 71.2 is
not skipped and fails.

The root cause is function evlist__open() called from
test__perf_time_to_tsc().  evlist__open() returns -ENOENT because the
event cycles:u is not supported by the selected PMU, for example
platform s390 on z/VM or an x86_64 virtual machine.

The PMU driver returns -ENOENT in this case. This error is leads to the
failure.

Fix this by returning TEST_SKIP on -ENOENT.

Output before:
 71: Convert perf time to TSC:
 71.1: TSC support:             Skip (This architecture does not support)
 71.2: Perf time to TSC:        FAILED!

Output after:
 71: Convert perf time to TSC:
 71.1: TSC support:             Skip (This architecture does not support)
 71.2: Perf time to TSC:        Skip (perf_read_tsc_conversion is not supported)

This also happens on an x86_64 virtual machine:
   # uname -m
   x86_64
   $ ./perf test -F 71
    71: Convert perf time to TSC  :
    71.1: TSC support             : Ok
    71.2: Perf time to TSC        : FAILED!
   $

Committer testing:

Continues to work on x86_64:

  $ perf test 71
   71: Convert perf time to TSC    :
   71.1: TSC support               : Ok
   71.2: Perf time to TSC          : Ok
  $

Fixes: 290fa68b ("perf test tsc: Fix error message when not supported")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Chengdong Li <chengdongli@tencent.com>
Cc: chengdongli@tencent.com
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: https://lore.kernel.org/r/20220420062921.1211825-1-tmricht@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Since commit bb30acae ("perf report: Bail out --mem-mode if mem
info is not available") "perf mem report" and "perf report --mem-mode"
don't report result if the PERF_SAMPLE_DATA_SRC bit is missed in sample
type.

The commit ffab4870 ("perf: arm-spe: Fix perf report
--mem-mode") partially fixes the issue.  It adds PERF_SAMPLE_DATA_SRC
bit for Arm SPE event, this allows the perf data file generated by
kernel v5.18-rc1 or later version can be reported properly.

On the other hand, perf tool still fails to be backward compatibility
for a data file recorded by an older version's perf which contains Arm
SPE trace data.  This patch is a workaround in reporting phase, when
detects ARM SPE PMU event and without PERF_SAMPLE_DATA_SRC bit, it will
force to set the bit in the sample type and give a warning info.

Fixes: bb30acae ("perf report: Bail out --mem-mode if mem info is not available")
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: German Gomez <german.gomez@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: https://lore.kernel.org/r/20220414123201.842754-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

If use command 'perf script -F,+data_src' to dump memory samples with
Arm SPE trace data, it reports error:

  # perf script -F,+data_src
  Samples for 'dummy:u' event do not have DATA_SRC attribute set. Cannot print 'data_src' field.

This is because the 'dummy:u' event is absent DATA_SRC bit in its sample
type, so if a file contains AUX area tracing data then always allow
field 'data_src' to be selected as an option for perf script.

Fixes: e55ed342 ("perf arm-spe: Synthesize memory event")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220417114837.839896-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>