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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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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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level cache. Its reference is held over the lifetime of the deviceid
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pointing to it.
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pointing to it.
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+
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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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Fred Isaman