[PATCH v11 04/10] fs, iov_iter: define meta io descriptor

Anuj Gupta
2024-11-28T11:46:07Z

Add flags to describe checks for integrity meta buffer. Also, introduce
a new 'uio_meta' structure that upper layer can use to pass the
meta/integrity information.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
include/linux/uio.h | 9 +++++++++
include/uapi/linux/fs.h | 9 +++++++++
2 files changed, 18 insertions(+)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 853f9de5aa05..8ada84e85447 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -82,6 +82,15 @@ struct iov_iter {
};
};

+typedef __u16 uio_meta_flags_t;
+
+struct uio_meta {
+ uio_meta_flags_t flags;
+ u16 app_tag;
+ u64 seed;
+ struct iov_iter iter;
+};
+
static inline const struct iovec *iter_iov(const struct iov_iter *iter)
{
if (iter->iter_type == ITER_UBUF)
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 753971770733..9070ef19f0a3 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -40,6 +40,15 @@
#define BLOCK_SIZE_BITS 10
#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)

+/* flags for integrity meta */
+#define IO_INTEGRITY_CHK_GUARD (1U << 0) /* enforce guard check */
+#define IO_INTEGRITY_CHK_REFTAG (1U << 1) /* enforce ref check */
+#define IO_INTEGRITY_CHK_APPTAG (1U << 2) /* enforce app check */
+
+#define IO_INTEGRITY_VALID_FLAGS (IO_INTEGRITY_CHK_GUARD | \
+ IO_INTEGRITY_CHK_REFTAG | \
+ IO_INTEGRITY_CHK_APPTAG)
+
#define SEEK_SET 0 /* seek relative to beginning of file */
#define SEEK_CUR 1 /* seek relative to current file position */
#define SEEK_END 2 /* seek relative to end of file */
--
2.25.1