Change preallocation=falloc to use fallocate() instead of
posix_fallocte(), improving performance when legacy filesystem that do
not support fallocate, and avoiding issues seen with OFD locks.

More work is needed to respect cache mode when using full preallocation
and maybe optimize buffer size.

Continuing the discussion at:
https://lists.nongnu.org/archive/html/qemu-block/2020-08/msg00947.html

Nir Soffer (2):
  block: file-posix: Extract preallocate helpers
  block: file-posix: Replace posix_fallocate with fallocate

 block/file-posix.c                     | 202 ++++++++++++++-----------
 docs/system/qemu-block-drivers.rst.inc |  11 +-
 docs/tools/qemu-img.rst                |  11 +-
 qapi/block-core.json                   |   4 +-
 4 files changed, 127 insertions(+), 101 deletions(-)

-- 
2.26.2

Patchew URL: https://patchew.org/QEMU/20200831140127.657134-1-nsoffer@redhat.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 20200831140127.657134-1-nsoffer@redhat.com
Subject: [PATCH 0/2] Replace posix_fallocate() with falloate()

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

From https://github.com/patchew-project/qemu
 * [new tag]         patchew/20200831140127.657134-1-nsoffer@redhat.com -> patchew/20200831140127.657134-1-nsoffer@redhat.com
Switched to a new branch 'test'
70e35ed block: file-posix: Replace posix_fallocate with fallocate
35d89d1 block: file-posix: Extract preallocate helpers

=== OUTPUT BEGIN ===
1/2 Checking commit 35d89d1300e4 (block: file-posix: Extract preallocate helpers)
ERROR: braces {} are necessary for all arms of this statement
#33: FILE: block/file-posix.c:1841:
+    if (offset == current_length)
[...]

total: 1 errors, 0 warnings, 234 lines checked

Patch 1/2 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

2/2 Checking commit 70e35eda5bc9 (block: file-posix: Replace posix_fallocate with fallocate)
ERROR: braces {} are necessary for all arms of this statement
#110: FILE: block/file-posix.c:1967:
+        if (result != -ENOTSUP)
[...]

total: 1 errors, 0 warnings, 108 lines checked

Patch 2/2 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20200831140127.657134-1-nsoffer@redhat.com/testing.checkpatch/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

On Mon, Aug 31, 2020 at 5:01 PM Nir Soffer <nirsof@gmail.com> wrote:
>
> Change preallocation=falloc to use fallocate() instead of
> posix_fallocte(), improving performance when legacy filesystem that do
> not support fallocate, and avoiding issues seen with OFD locks.
>
> More work is needed to respect cache mode when using full preallocation
> and maybe optimize buffer size.
>
> Continuing the discussion at:
> https://lists.nongnu.org/archive/html/qemu-block/2020-08/msg00947.html
>
> Nir Soffer (2):
>   block: file-posix: Extract preallocate helpers
>   block: file-posix: Replace posix_fallocate with fallocate
>
>  block/file-posix.c                     | 202 ++++++++++++++-----------
>  docs/system/qemu-block-drivers.rst.inc |  11 +-
>  docs/tools/qemu-img.rst                |  11 +-
>  qapi/block-core.json                   |   4 +-
>  4 files changed, 127 insertions(+), 101 deletions(-)

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