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Diffstat (limited to 'Documentation/filesystems/nfs/localio.rst')
| -rw-r--r-- | Documentation/filesystems/nfs/localio.rst | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/filesystems/nfs/localio.rst b/Documentation/filesystems/nfs/localio.rst index 7d2dbf75e96d..79808b37d745 100644 --- a/Documentation/filesystems/nfs/localio.rst +++ b/Documentation/filesystems/nfs/localio.rst @@ -291,7 +291,7 @@ align their IO). Security ======== -Localio is only supported when UNIX-style authentication (AUTH_UNIX, aka +LOCALIO is only supported when UNIX-style authentication (AUTH_UNIX, aka AUTH_SYS) is used. Care is taken to ensure the same NFS security mechanisms are used @@ -306,6 +306,24 @@ client is afforded this same level of access (albeit in terms of the NFS protocol via SUNRPC). No other namespaces (user, mount, etc) have been altered or purposely extended from the server to the client. +Module Parameters +================= + +/sys/module/nfs/parameters/localio_enabled (bool) +controls if LOCALIO is enabled, defaults to Y. If client and server are +local but 'localio_enabled' is set to N then LOCALIO will not be used. + +/sys/module/nfs/parameters/localio_O_DIRECT_semantics (bool) +controls if O_DIRECT extends down to the underlying filesystem, defaults +to N. Application IO must be logical blocksize aligned, otherwise +O_DIRECT will fail. + +/sys/module/nfsv3/parameters/nfs3_localio_probe_throttle (uint) +controls if NFSv3 read and write IOs will trigger (re)enabling of +LOCALIO every N (nfs3_localio_probe_throttle) IOs, defaults to 0 +(disabled). Must be power-of-2, admin keeps all the pieces if they +misconfigure (too low a value or non-power-of-2). + Testing ======= |