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NFSv4.1: lseg documentation

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Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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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 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 level cache. Its reference is held over the lifetime of the deviceid
pointing to it. 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.