[PATCH pNFS wave 3 Version 3 18/18] NFSv4.1: lseg documentation

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From: Fred Isaman <iisaman@xxxxxxxxxx>

Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxx>
---
 Documentation/filesystems/nfs/pnfs.txt |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/Documentation/filesystems/nfs/pnfs.txt b/Documentation/filesystems/nfs/pnfs.txt
index bc0b9cf..983e14a 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.
-- 
1.6.6

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