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Mike Kravetz 68d32527d3 hugetlbfs: zero partial pages during fallocate hole punch 
hugetlbfs fallocate support was originally added with commit 70c3547e36
("hugetlbfs: add hugetlbfs_fallocate()").  Initial support only operated
on whole hugetlb pages.  This makes sense for populating files as other
interfaces such as mmap and truncate require hugetlb page size alignment. 
Only operating on whole hugetlb pages for the hole punch case was a
simplification and there was no compelling use case to zero partial pages.

In a recent discussion[1] it was assumed that hugetlbfs hole punch would
zero partial hugetlb pages as that is in line with the man page
description saying 'partial filesystem blocks are zeroed'.  However, the
hugetlbfs hole punch code actually does this:

        hole_start = round_up(offset, hpage_size);
        hole_end = round_down(offset + len, hpage_size);

Modify code to zero partial hugetlb pages in hole punch range.  It is
possible that application code could note a change in behavior.  However,
that would imply the code is passing in an unaligned range and expecting
only whole pages be removed.  This is unlikely as the fallocate
documentation states the opposite.

The current hugetlbfs fallocate hole punch behavior is tested with the
libhugetlbfs test fallocate_align[2].  This test will be updated to
validate partial page zeroing.

[1] https://lore.kernel.org/linux-mm/20571829-9d3d-0b48-817c-b6b15565f651@redhat.com/
[2] https://github.com/libhugetlbfs/libhugetlbfs/blob/master/tests/fallocate_align.c

Link: https://lkml.kernel.org/r/YqeiMlZDKI1Kabfe@monkey
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-06-16 19:11:32 -07:00
arch virtio,vdpa: fixes 2022-06-11 16:32:47 -07:00
block block: remove bioset_init_from_src 2022-06-08 14:04:14 -04:00
certs certs: Convert spaces in certs/Makefile to a tab 2022-06-10 11:42:02 -07:00
crypto This update includes the following changes: 2022-05-27 18:06:49 -07:00
Documentation Kbuild fixes for v5.19 2022-06-12 11:10:07 -07:00
drivers platform-drivers-x86 for v5.19-2 2022-06-12 11:33:42 -07:00
fs hugetlbfs: zero partial pages during fallocate hole punch 2022-06-16 19:11:32 -07:00
include mm: re-allow pinning of zero pfns 2022-06-16 19:11:32 -07:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-09 10:11:12 -07:00
ipc These changes update the ipc sysctls so that they are fundamentally 2022-06-03 15:54:57 -07:00
kernel kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal 2022-06-16 19:11:30 -07:00
lib Random number generator fixes for Linux 5.19-rc2. 2022-06-12 10:33:38 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: memcontrol: reference to tools/cgroup/memcg_slabinfo.py 2022-06-16 19:11:32 -07:00
net Notable changes: 2022-06-10 17:28:43 -07:00
samples drm for 5.19-rc1 2022-05-25 16:18:27 -07:00
scripts Kbuild fixes for v5.19 2022-06-12 11:10:07 -07:00
security KEYS: trusted: tpm2: Fix migratable logic 2022-06-08 14:12:13 +03:00
sound sound fixes for 5.19-rc2 2022-06-10 10:20:57 -07:00
tools Random number generator fixes for Linux 5.19-rc2. 2022-06-12 10:33:38 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt * Fix syzkaller NULL pointer dereference 2022-06-08 09:16:31 -07:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap MAINTAINERS: update Abel Vesa's email 2022-06-16 19:11:31 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add maillist information for LoongArch 2022-06-16 19:11:31 -07:00
Makefile Linux 5.19-rc2 2022-06-12 16:11:37 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.