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f2fs: don't allow unaligned truncation to smaller/equal size on pinned file

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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.

Signed-off-by: wangzijie <wangzijie1@honor.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
wangzijie 2025-06-24 11:59:38 +08:00 committed by Jaegeuk Kim
parent a919ae794a
commit d738f70856
1 changed files with 11 additions and 0 deletions
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11
fs/f2fs/file.c
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@ -1064,6 +1064,17 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
!IS_ALIGNED(attr->ia_size,
F2FS_BLK_TO_BYTES(fi->i_cluster_size)))
return -EINVAL;
/*
* 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.
*/
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 = setattr_prepare(idmap, dentry, attr);