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orangefs: add features op

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This is a new userspace operation, which will be done if the client-core
version is greater than or equal to 2.9.6. This will provide a way to
implement optional features and to determine which features are
supported by the client-core. If the client-core version is older than
2.9.6, no optional features are supported and the op will not be done.

The intent is to allow protocol extensions without relying on the
client-core's current behavior of ignoring what it doesn't understand.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
This commit is contained in:
Martin Brandenburg
2016-08-12 12:02:31 -04:00
parent f2ee3b7595
commit 482664ddba
7 changed files with 53 additions and 6 deletions
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4
fs/orangefs/orangefs-dev-proto.h
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@@ -41,6 +41,10 @@
#define ORANGEFS_VFS_OP_FSYNC 0xFF00EE01
#define ORANGEFS_VFS_OP_FSKEY 0xFF00EE02
#define ORANGEFS_VFS_OP_READDIRPLUS 0xFF00EE03
#define ORANGEFS_VFS_OP_FEATURES 0xFF00EE05 /* 2.9.6 */
/* features is a 64-bit unsigned bitmask */
#define ORANGEFS_FEATURE_READAHEAD 1
/*
* Misc constants. Please retain them as multiples of 8!