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NFSv4.1: lseg documentation 

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2011-03-01 01:34:23 +00:00 committed by Trond Myklebust
parent 568e8c494d
commit 80fe2b192d
1 changed files with 7 additions and 0 deletions
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7
Documentation/filesystems/nfs/pnfs.txt
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@ -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.