linux-kernel - Re: [f2fs-dev] [PATCH v5 2/2] f2fs: don't allow unaligned truncation to smaller/equal size on pinned file

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Message-ID: <f90da85f-4498-4646-be26-652a3e2681fd@kernel.org>
Date: Mon, 30 Jun 2025 19:12:06 +0800
From: Chao Yu <chao@...nel.org>
To: wangzijie <wangzijie1@...or.com>, jaegeuk@...nel.org
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, bintian.wang@...or.com, feng.han@...or.com,
 niuzhiguo84@...il.com
Subject: Re: [f2fs-dev] [PATCH v5 2/2] f2fs: don't allow unaligned truncation
 to smaller/equal size on pinned file

On 6/30/25 17:54, wangzijie wrote:
> To prevent scattered pin block generation, don't allow non-section aligned truncation
> to smaller or equal size on pinned file. But for truncation to larger size, after
> commit 3fdd89b452c2("f2fs: prevent writing without fallocate() for pinned files"),
> we only support overwrite IO to pinned file, so we don't need to consider
> attr->ia_size > i_size case.
> In addition, xfstests #494 assumes truncation on active swapfile(pinned) will return
> ETXTBSY by setattr_prepare() -> inode_newsize_ok(), so we relocate this check after
> setattr_prepare().
> 
> Signed-off-by: wangzijie <wangzijie1@...or.com>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,