[pNFS,wave,3,Version,3,18/18] NFSv4.1: lseg documentation
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Message ID 1298943263-2886-19-git-send-email-andros@netapp.com
State Accepted, archived
Delegated to: Trond Myklebust
Headers show

Commit Message

Andy Adamson March 1, 2011, 1:34 a.m. UTC
None

Patch
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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.