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Message-ID: <679c7dae-91c4-4ad0-a2cb-55dc92b47fd4@kernel.org>
Date: Thu, 12 Sep 2024 15:14:24 +0800
From: Chao Yu <chao@...nel.org>
To: Wu Bo <bo.wu@...o.com>, linux-kernel@...r.kernel.org
Cc: chao@...nel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
linux-f2fs-devel@...ts.sourceforge.net, Wu Bo <wubo.oduw@...il.com>
Subject: Re: [PATCH v2 00/13] f2fs: introduce inline tail
On 2024/9/11 11:57, Wu Bo wrote:
> The inode in F2FS occupies an entire 4k block. For many small files, this means
> they consume much more space than their actual size. Therefore, there is
> significant potential to better utilize the inode block space.
>
> Currently, F2FS has two features to make use of the inode block space: inline
> data and inline xattr.
>
> Inline data stores file which size is smaller then 3.5k in inode block. However,
> for slightly larger small files, there still have much waste.
> For example, a 5k file requires 3 blocks, totaling 12k of space, which is
> more than twice the size of the file itself!
>
> Additionally, the end of a file often does not occupy an entire block. If we can
> store the end of the file data within the inode block, we can save an entire
> block for the file. This is particularly important for small files.
>
> In fact, the current inline data is a special case of inline tail, and
> inline tail is an extension of inline data.
>
> To make it simple, inline tail only on small files(<64k). And for larger files,
> inline tails don't provide any significant benefits.
>
> The layout of an inline tail inode block is following:
>
> | inode block | 4096 | inline tail enable |
> | --------------- | ---- | --------------------------|
> | inode info | 360 | |
> | --------------- | ---- | --------------------------|
> | | | extra info | 0~36 |
> | | | **compact_addr[16] | 64 |
> | addr table[923] | 3692 | reserved | 4 |
> | | | **tail data | |
> | | | inline_xattr | 200 |
> | --------------- | ---- | --------------------------|
> | nid table[5] | 20 |
> | node footer | 24 |
>
> F2fs-tools to support inline tail:
> https://lore.kernel.org/linux-f2fs-devel/20240903075931.3339584-1-bo.wu@vivo.com
>
> I tested inline tail by copying the source code of Linux 6.9.7. The storage
> space was reduced by approximately 8%. Additionally, due to the reduced IO, the
> copy time also reduced by around 10%.
>
> This patch series has been tested with xfstests by running 'kvm-xfstests -c f2fs
> -g quick' both with and without the patch; no regressions were observed.
> The test result is:
> f2fs/default: 583 tests, 6 failures, 213 skipped, 650 seconds
> Failures: generic/050 generic/064 generic/250 generic/252 generic/563
> generic/735
> Totals: 607 tests, 213 skipped, 30 failures, 0 errors, 579s
MKFS_OPTIONS -- -O extra_attr,encrypt,inode_checksum,flexible_inline_xattr,inode_crtime,verity,compression -f /dev/vdc
MOUNT_OPTIONS -- -o acl,user_xattr -o discard,inline_tail /dev/vdc /mnt/scratch_f2fs
Before:
Failures: generic/042 generic/050 generic/250 generic/252 generic/270 generic/389 generic/563 generic/700 generic/735
Failed 9 of 746 tests
After:
Failures: generic/042 generic/050 generic/125 generic/250 generic/252 generic/270 generic/389 generic/418 generic/551 generic/563 generic/700 generic/735
Failed 12 of 746 tests
Failures: f2fs/004
Can you please check failed testcases?
Thanks,
>
> ---
> v2:
> - fix ARCH=arc build warning
>
> ---
> Wu Bo (13):
> f2fs: add inline tail mount option
> f2fs: add inline tail disk layout definition
> f2fs: implement inline tail write & truncate
> f2fs: implement inline tail read & fiemap
> f2fs: set inline tail flag when create inode
> f2fs: fix address info has been truncated
> f2fs: support seek for inline tail
> f2fs: convert inline tail when inode expand
> f2fs: fix data loss during inline tail writing
> f2fs: avoid inlining quota files
> f2fs: fix inline tail data lost
> f2fs: convert inline tails to avoid potential issues
> f2fs: implement inline tail forward recovery
>
> fs/f2fs/data.c | 93 +++++++++++++++++++++++++-
> fs/f2fs/f2fs.h | 46 ++++++++++++-
> fs/f2fs/file.c | 85 +++++++++++++++++++++++-
> fs/f2fs/inline.c | 159 +++++++++++++++++++++++++++++++++++++++------
> fs/f2fs/inode.c | 6 ++
> fs/f2fs/namei.c | 3 +
> fs/f2fs/node.c | 6 +-
> fs/f2fs/recovery.c | 9 ++-
> fs/f2fs/super.c | 25 +++++++
> fs/f2fs/verity.c | 4 ++
> 10 files changed, 409 insertions(+), 27 deletions(-)
>
>
> base-commit: 67784a74e258a467225f0e68335df77acd67b7ab
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