[lustre-devel] [PATCH 1/5] lustre: uapi: fallocate interop for 2.14 clients

[James Simmons]

From: Arshad Hussain <arshad.hussain at aeoncomputing.com>

fallocate() start and end are passed in o_size and o_blocks
on the wire.  Clients 2.15.0 and newer should always set
the OBD_MD_FLSIZE and OBD_MD_FLBLOCKS valid flags, but some
older client versions did not.  We permit older clients to
not set these flags, checking their version by proxy using
the missing OBD_CONNECT_TRUNCLOCK to imply 2.14.0 or older.

WC-bug-id: https://jira.whamcloud.com/browse/LU-15748
Lustre-commit: 79053592966792a21 ("LU-15748 osc: fallocate interop for 2.14 clients")
Signed-off-by: Arshad Hussain <arshad.hussain at aeoncomputing.com>
Reviewed-on: https://review.whamcloud.com/47098
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
 include/uapi/linux/lustre/lustre_idl.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/lustre/lustre_idl.h b/include/uapi/linux/lustre/lustre_idl.h
index 753df16..37db3ee 100644
--- a/include/uapi/linux/lustre/lustre_idl.h
+++ b/include/uapi/linux/lustre/lustre_idl.h
@@ -691,6 +691,9 @@ struct ptlrpc_body_v2 {
 #define OBD_CONNECT_ACL			 0x80ULL /*access control lists */
 #define OBD_CONNECT_XATTR		0x100ULL /*client use extended attr */
 #define OBD_CONNECT_LARGE_ACL		0x200ULL /* more than 32 ACL entries */
+/* was OBD_CONNECT_TRUNCLOCK		0x400ULL *locks on server for punch */
+/* temporary reuse until 2.21.53 to indicate pre-2.15 client, see LU-15478 */
+#define OBD_CONNECT_OLD_FALLOC		0x400ULL /* missing o_valid flags */
 #define OBD_CONNECT_TRANSNO		0x800ULL /*replay sends init transno */
 #define OBD_CONNECT_IBITS	       0x1000ULL /* not checked in 2.11+ */
 #define OBD_CONNECT_BARRIER	       0x2000ULL /* write barrier. Resevered to
-- 
1.8.3.1