NFSv4.1: lseg documentation
Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -46,3 +46,10 @@ data server cache
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file driver devices refer to data servers, which are kept in a module
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level cache. Its reference is held over the lifetime of the deviceid
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pointing to it.
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lseg
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----
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lseg maintains an extra reference corresponding to the NFS_LSEG_VALID
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bit which holds it in the pnfs_layout_hdr's list. When the final lseg
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is removed from the pnfs_layout_hdr's list, the NFS_LAYOUT_DESTROYED
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bit is set, preventing any new lsegs from being added.
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