fs/nfsd/blocklayoutxdr.h

   1 #ifndef _NFSD_BLOCKLAYOUTXDR_H
   2 #define _NFSD_BLOCKLAYOUTXDR_H 1
   3
   4 #include <linux/blkdev.h>
   5 #include "xdr4.h"
   6
   7 struct iomap;
   8 struct xdr_stream;
   9
  10 enum pnfs_block_extent_state {
  11         PNFS_BLOCK_READWRITE_DATA       = 0,
  12         PNFS_BLOCK_READ_DATA            = 1,
  13         PNFS_BLOCK_INVALID_DATA         = 2,
  14         PNFS_BLOCK_NONE_DATA            = 3,
  15 };
  16
  17 struct pnfs_block_extent {
  18         struct nfsd4_deviceid           vol_id;
  19         u64                             foff;
  20         u64                             len;
  21         u64                             soff;
  22         enum pnfs_block_extent_state    es;
  23 };
  24 #define NFS4_BLOCK_EXTENT_SIZE          44
  25
  26 enum pnfs_block_volume_type {
  27         PNFS_BLOCK_VOLUME_SIMPLE        = 0,
  28         PNFS_BLOCK_VOLUME_SLICE         = 1,
  29         PNFS_BLOCK_VOLUME_CONCAT        = 2,
  30         PNFS_BLOCK_VOLUME_STRIPE        = 3,
  31 };
  32
  33 /*
  34  * Random upper cap for the uuid length to avoid unbounded allocation.
  35  * Not actually limited by the protocol.
  36  */
  37 #define PNFS_BLOCK_UUID_LEN     128
  38
  39 struct pnfs_block_volume {
  40         enum pnfs_block_volume_type     type;
  41         union {
  42                 struct {
  43                         u64             offset;
  44                         u32             sig_len;
  45                         u8              sig[PNFS_BLOCK_UUID_LEN];
  46                 } simple;
  47         };
  48 };
  49
  50 struct pnfs_block_deviceaddr {
  51         u32                             nr_volumes;
  52         struct pnfs_block_volume        volumes[];
  53 };
  54
  55 __be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
  56                 struct nfsd4_getdeviceinfo *gdp);
  57 __be32 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
  58                 struct nfsd4_layoutget *lgp);
  59 int nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
  60                 u32 block_size);
  61
  62 #endif /* _NFSD_BLOCKLAYOUTXDR_H */