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nfs: add export operations

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This support for opening files on NFS by file handle, both through the
open_by_handle syscall, and for re-exporting NFS (for example using a
different version).  The support is very basic for now, as each open by
handle will have to do an NFSv4 open operation on the wire.  In the
future this will hopefully be mitigated by an open file cache, as well
as various optimizations in NFS for this specific case.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
[hch: incorporated various changes, resplit the patches, new changelog]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Peng Tao
2017-06-29 06:34:53 -07:00
committed by Anna Schumaker
parent 5b5faaf6df
commit 20fa190272
4 changed files with 182 additions and 1 deletions
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fs/nfs/internal.h
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@@ -10,6 +10,8 @@
#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
extern const struct export_operations nfs_export_ops;
struct nfs_string;
/* Maximum number of readahead requests