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f2fs: reject setattr size changes on large folio files

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F2FS large folios are only enabled for immutable non-compressed files.
Writable open and writable mmap reject such mappings, but truncate(2)
through f2fs_setattr() misses the same guard.

If FS_IMMUTABLE_FL is cleared while the inode is still cached, the mapping
can keep large-folio support and ATTR_SIZE can change i_size. Reject size
changes in that state.

Cc: stable@kernel.org
Fixes: 05e65c14ea ("f2fs: support large folio for immutable non-compressed case")
Signed-off-by: Wenjie Qi <qiwenjie@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Wenjie Qi 2026-06-10 22:37:35 +08:00 committed by Jaegeuk Kim
parent 90e02a8e1b
commit 242d30bfc0
1 changed files with 2 additions and 0 deletions
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fs/f2fs/file.c
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@ -1098,6 +1098,8 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
return -EPERM;
if ((attr->ia_valid & ATTR_SIZE)) {
if (mapping_large_folio_support(inode->i_mapping))
return -EOPNOTSUPP;
if (!f2fs_is_compress_backend_ready(inode) ||
IS_DEVICE_ALIASING(inode))
return -EOPNOTSUPP;