I think we can clean up more like this?
https://lore.kernel.org/linux-f2fs-devel/20250630160839.1142073-1-jaeg...@kernel.org/T/#u
On 06/30, 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 <wangzij...@honor.com>
> ---
> v5:
> - fix xfstests #494 fail
> ---
> fs/f2fs/file.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 78368b793..d4feea44b 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1070,6 +1070,23 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct
> dentry *dentry,
> if (err)
> return err;
>
> + /*
> + * To prevent scattered pin block generation, we don't allow
> + * smaller/equal size unaligned truncation for pinned file.
> + * We only support overwrite IO to pinned file, so don't
> + * care about larger size truncation.
> + * We need to check this after setattr_prepare() because xfstests
> + * #494 assumes truncation on active swapfile(pinned) will
> + * return ETXTBSY by setattr_prepare() -> inode_newsize_ok().
> + */
> + if (attr->ia_valid & ATTR_SIZE) {
> + if (f2fs_is_pinned_file(inode) &&
> + attr->ia_size <= i_size_read(inode) &&
> + !IS_ALIGNED(attr->ia_size,
> + F2FS_BLK_TO_BYTES(CAP_BLKS_PER_SEC(sbi))))
> + return -EINVAL;
> + }
> +
> err = fscrypt_prepare_setattr(dentry, attr);
> if (err)
> return err;
> --
> 2.25.1
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