From 80fe2b192dbc53261e385dc26d90f5195f1c62e7 Mon Sep 17 00:00:00 2001 From: Fred Isaman Date: Tue, 1 Mar 2011 01:34:23 +0000 Subject: NFSv4.1: lseg documentation Signed-off-by: Fred Isaman Signed-off-by: Trond Myklebust --- Documentation/filesystems/nfs/pnfs.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/filesystems/nfs/pnfs.txt b/Documentation/filesystems/nfs/pnfs.txt index bc0b9cfe095b..983e14abe7e9 100644 --- a/Documentation/filesystems/nfs/pnfs.txt +++ b/Documentation/filesystems/nfs/pnfs.txt @@ -46,3 +46,10 @@ data server cache file driver devices refer to data servers, which are kept in a module level cache. Its reference is held over the lifetime of the deviceid pointing to it. + +lseg +---- +lseg maintains an extra reference corresponding to the NFS_LSEG_VALID +bit which holds it in the pnfs_layout_hdr's list. When the final lseg +is removed from the pnfs_layout_hdr's list, the NFS_LAYOUT_DESTROYED +bit is set, preventing any new lsegs from being added. -- cgit v1.2.3