git: c18c74a87c15 - main - namei: Add cn_flags bits for OPENREAD and OPENWRITE

[Rick Macklem]

The branch main has been updated by rmacklem:

URL: https://cgit.FreeBSD.org/src/commit/?id=c18c74a87c15f5f8774df7e2f8fa0fe72422203d

commit c18c74a87c15f5f8774df7e2f8fa0fe72422203d
Author:     Rick Macklem <rmacklem at FreeBSD.org>
AuthorDate: 2021-08-07 01:41:11 +0000
Commit:     Rick Macklem <rmacklem at FreeBSD.org>
CommitDate: 2021-08-07 01:41:11 +0000

    namei: Add cn_flags bits for OPENREAD and OPENWRITE
    
    VOP_LOOKUP() is called with cn_flags bits ISLASTCN and ISOPEN
    to indicate that the lookup is for the last component of a pathname
    when doing open.
    
    If the cn_flags also indicates if the open is for Reading, Writing or Both,
    the NFSv4 client can do an NFSv4 Open operation in the same compound
    RPC as Lookup, often avoiding the additional Open RPC now done when
    VOP_OPEN() is called.
    
    This patch defines two new cn_flags bits called OPENREAD and OPENWRITE
    and sets these in open2nameif() based on FREAD, FWRITE flag bits.
    This will allow a subsequent patch to the NFSv4 client to do the Open
    operation in the same RPC as Lookup.
    
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D31431
---
 sys/kern/vfs_vnops.c | 4 ++++
 sys/sys/namei.h      | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index c54f55a99036..832ade5d800e 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -205,6 +205,10 @@ open2nameif(int fmode, u_int vn_open_flags)
 		res |= RBENEATH;
 	if ((fmode & O_EMPTY_PATH) != 0)
 		res |= EMPTYPATH;
+	if ((fmode & FREAD) != 0)
+		res |= OPENREAD;
+	if ((fmode & FWRITE) != 0)
+		res |= OPENWRITE;
 	if ((vn_open_flags & VN_OPEN_NOAUDIT) == 0)
 		res |= AUDITVNODE1;
 	if ((vn_open_flags & VN_OPEN_NOCAPCHECK) != 0)
diff --git a/sys/sys/namei.h b/sys/sys/namei.h
index 9e0a82ea1659..3f6e59289f0a 100644
--- a/sys/sys/namei.h
+++ b/sys/sys/namei.h
@@ -183,8 +183,8 @@ int	cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
 #define	AUDITVNODE1	0x00040000 /* audit the looked up vnode information */
 #define	AUDITVNODE2	0x00080000 /* audit the looked up vnode information */
 #define	NOCAPCHECK	0x00100000 /* do not perform capability checks */
-/* UNUSED		0x00200000 */
-/* UNUSED		0x00400000 */
+#define	OPENREAD	0x00200000 /* open for reading */
+#define	OPENWRITE	0x00400000 /* open for writing */
 /* UNUSED		0x00800000 */
 #define	HASBUF		0x01000000 /* has allocated pathname buffer */
 #define	NOEXECCHECK	0x02000000 /* do not perform exec check on dir */