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[v3,05/10] block: define meta io descriptor

Message ID 20240823103811.2421-6-anuj20.g@samsung.com
State Superseded
Headers show
Series Read/Write with meta/integrity | expand

Commit Message

Anuj Gupta Aug. 23, 2024, 10:38 a.m. UTC 
From: Kanchan Joshi <joshi.k@samsung.com>

Introduces 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>
---
 include/linux/bio-integrity.h | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Martin K. Petersen Aug. 29, 2024, 3:05 a.m. UTC | #1 
Anuj,

> +struct uio_meta {
> +	meta_flags_t	flags;
> +	u16		app_tag;
> +	struct		iov_iter iter;
> +};

What about the ref tag seed? Or does the proposed API assume that the
first block of the I/O always has a ref tag of 0?
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Patch

diff --git a/include/linux/bio-integrity.h b/include/linux/bio-integrity.h
index 5313811dc1ce..a1a9031a5985 100644
--- a/include/linux/bio-integrity.h
+++ b/include/linux/bio-integrity.h
@@ -30,6 +30,15 @@  struct bio_integrity_payload {
 	struct bio_vec		bip_inline_vecs[];/* embedded bvec array */
 };
 
+/* flags for integrity meta */
+typedef __u16 __bitwise meta_flags_t;
+
+struct uio_meta {
+	meta_flags_t	flags;
+	u16		app_tag;
+	struct		iov_iter iter;
+};
+
 #define BIP_CLONE_FLAGS (BIP_MAPPED_INTEGRITY | BIP_CTRL_NOCHECK | \
 			 BIP_DISK_NOCHECK | BIP_IP_CHECKSUM)