[PATCH v8 09/22] iomap: introduce iomap_fsverity_write() for writing fsverity metadata

Andrey Albershteyn
2026-04-20T11:48:02Z

This is just a wrapper around iomap_file_buffered_write() to create
necessary iterator over metadata.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
---
fs/iomap/buffered-io.c | 25 +++++++++++++++++++++++++
include/linux/iomap.h | 3 +++
2 files changed, 28 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 843314852663..5c9fd925a62f 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1287,6 +1287,31 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
}
EXPORT_SYMBOL_GPL(iomap_file_buffered_write);

+int iomap_fsverity_write(struct file *file, loff_t pos, size_t length,
+ const void *buf, const struct iomap_ops *ops,
+ const struct iomap_write_ops *write_ops)
+{
+ int ret;
+ struct iov_iter iiter;
+ struct kvec kvec = {
+ .iov_base = (void *)buf,
+ .iov_len = length,
+ };
+ struct kiocb iocb = {
+ .ki_filp = file,
+ .ki_ioprio = get_current_ioprio(),
+ .ki_pos = pos,
+ };
+
+ iov_iter_kvec(&iiter, WRITE, &kvec, 1, length);
+
+ ret = iomap_file_buffered_write(&iocb, &iiter, ops, write_ops, NULL);
+ if (ret < 0)
+ return ret;
+ return ret == length ? 0 : -EIO;
+}
+EXPORT_SYMBOL_GPL(iomap_fsverity_write);
+
static void iomap_write_delalloc_ifs_punch(struct inode *inode,
struct folio *folio, loff_t start_byte, loff_t end_byte,
struct iomap *iomap, iomap_punch_t punch)
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 4d9202cae29f..83586f09f365 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -359,6 +359,9 @@ static inline bool iomap_want_unshare_iter(const struct iomap_iter *iter)
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops,
const struct iomap_write_ops *write_ops, void *private);
+int iomap_fsverity_write(struct file *file, loff_t pos, size_t length,
+ const void *buf, const struct iomap_ops *ops,
+ const struct iomap_write_ops *write_ops);
void iomap_read_folio(const struct iomap_ops *ops,
struct iomap_read_folio_ctx *ctx, void *private);
void iomap_readahead(const struct iomap_ops *ops,
--
2.51.2