linux-kernel - [RFC PATCH 06/11] afs: Add some protocol defs

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Message-ID: <150428049261.25051.16872576898714385361.stgit@warthog.procyon.org.uk>
Date:   Fri, 01 Sep 2017 16:41:32 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-afs@...ts.infradead.org
Cc:     linux-fsdevel@...r.kernel.org, dhowells@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 06/11] afs: Add some protocol defs

Add some protocol definitions, including max field lengths, flag defs and
an XDR-encoded UUID def.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/afs.h    |   25 ++++++++++++++++++++-----
 fs/afs/afs_vl.h |    6 +++++-
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/fs/afs/afs.h b/fs/afs/afs.h
index 93053115bcfc..0d837bddbf7d 100644
--- a/fs/afs/afs.h
+++ b/fs/afs/afs.h
@@ -14,11 +14,14 @@
 
 #include <linux/in.h>
 
-#define AFS_MAXCELLNAME	64		/* maximum length of a cell name */
-#define AFS_MAXVOLNAME	64		/* maximum length of a volume name */
-#define AFSNAMEMAX	256		/* maximum length of a filename plus NUL */
-#define AFSPATHMAX	1024		/* maximum length of a pathname plus NUL */
-#define AFSOPAQUEMAX	1024		/* maximum length of an opaque field */
+#define AFS_MAXCELLNAME		64  	/* Maximum length of a cell name */
+#define AFS_MAXVOLNAME		64  	/* Maximum length of a volume name */
+#define AFS_MAXNSERVERS		8   	/* Maximum servers in a basic volume record */
+#define AFS_NMAXNSERVERS	13  	/* Maximum servers in a N/U-class volume record */
+#define AFS_MAXTYPES		3	/* Maximum number of volume types */
+#define AFSNAMEMAX		256 	/* Maximum length of a filename plus NUL */
+#define AFSPATHMAX		1024	/* Maximum length of a pathname plus NUL */
+#define AFSOPAQUEMAX		1024	/* Maximum length of an opaque field */
 
 typedef unsigned			afs_volid_t;
 typedef unsigned			afs_vnodeid_t;
@@ -176,4 +179,16 @@ struct afs_volume_status {
 
 #define AFS_BLOCK_SIZE	1024
 
+/*
+ * XDR encoding of UUID in AFS.
+ */
+struct afs_uuid__xdr {
+	__be32		time_low;
+	__be32		time_mid;
+	__be32		time_hi_and_version;
+	__be32		clock_seq_hi_and_reserved;
+	__be32		clock_seq_low;
+	__be32		node[6];
+};
+
 #endif /* AFS_H */
diff --git a/fs/afs/afs_vl.h b/fs/afs/afs_vl.h
index 800f607ffaf5..5b7cd9d7e9e6 100644
--- a/fs/afs/afs_vl.h
+++ b/fs/afs/afs_vl.h
@@ -74,11 +74,15 @@ struct afs_vldbentry {
 		struct in_addr	addr;		/* server address */
 		unsigned	partition;	/* partition ID on this server */
 		unsigned	flags;		/* server specific flags */
-#define AFS_VLSF_NEWREPSITE	0x0001	/* unused */
+#define AFS_VLSF_NEWREPSITE	0x0001	/* Ignore all 'non-new' servers */
 #define AFS_VLSF_ROVOL		0x0002	/* this server holds a R/O instance of the volume */
 #define AFS_VLSF_RWVOL		0x0004	/* this server holds a R/W instance of the volume */
 #define AFS_VLSF_BACKVOL	0x0008	/* this server holds a backup instance of the volume */
+#define AFS_VLSF_UUID		0x0010	/* This server is referred to by its UUID */
+#define AFS_VLSF_DONTUSE	0x0020	/* This server ref should be ignored */
 	} servers[8];
 };
 
+#define AFS_VLDB_MAXNAMELEN 65
+
 #endif /* AFS_VL_H */