nfsd: pNFS block layout driver
Add a small shim between core nfsd and filesystems to translate the
somewhat cumbersome pNFS data structures and semantics to something
more palatable for Linux filesystems.
Thanks to Rick McNeal for the old prototype pNFS blocklayout server
code, which gave a lot of inspiration to this version even if no
code is left from it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/nfsd/blocklayoutxdr.h b/fs/nfsd/blocklayoutxdr.h
new file mode 100644
index 0000000..fdc7903
--- /dev/null
+++ b/fs/nfsd/blocklayoutxdr.h
@@ -0,0 +1,62 @@
+#ifndef _NFSD_BLOCKLAYOUTXDR_H
+#define _NFSD_BLOCKLAYOUTXDR_H 1
+
+#include <linux/blkdev.h>
+#include "xdr4.h"
+
+struct iomap;
+struct xdr_stream;
+
+enum pnfs_block_extent_state {
+ PNFS_BLOCK_READWRITE_DATA = 0,
+ PNFS_BLOCK_READ_DATA = 1,
+ PNFS_BLOCK_INVALID_DATA = 2,
+ PNFS_BLOCK_NONE_DATA = 3,
+};
+
+struct pnfs_block_extent {
+ struct nfsd4_deviceid vol_id;
+ u64 foff;
+ u64 len;
+ u64 soff;
+ enum pnfs_block_extent_state es;
+};
+#define NFS4_BLOCK_EXTENT_SIZE 44
+
+enum pnfs_block_volume_type {
+ PNFS_BLOCK_VOLUME_SIMPLE = 0,
+ PNFS_BLOCK_VOLUME_SLICE = 1,
+ PNFS_BLOCK_VOLUME_CONCAT = 2,
+ PNFS_BLOCK_VOLUME_STRIPE = 3,
+};
+
+/*
+ * Random upper cap for the uuid length to avoid unbounded allocation.
+ * Not actually limited by the protocol.
+ */
+#define PNFS_BLOCK_UUID_LEN 128
+
+struct pnfs_block_volume {
+ enum pnfs_block_volume_type type;
+ union {
+ struct {
+ u64 offset;
+ u32 sig_len;
+ u8 sig[PNFS_BLOCK_UUID_LEN];
+ } simple;
+ };
+};
+
+struct pnfs_block_deviceaddr {
+ u32 nr_volumes;
+ struct pnfs_block_volume volumes[];
+};
+
+__be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
+ struct nfsd4_getdeviceinfo *gdp);
+__be32 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
+ struct nfsd4_layoutget *lgp);
+int nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
+ u32 block_size);
+
+#endif /* _NFSD_BLOCKLAYOUTXDR_H */