nfs4filelayout.h 4.0 KB

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  1. /*
  2. * NFSv4 file layout driver data structures.
  3. *
  4. * Copyright (c) 2002
  5. * The Regents of the University of Michigan
  6. * All Rights Reserved
  7. *
  8. * Dean Hildebrand <dhildebz@umich.edu>
  9. *
  10. * Permission is granted to use, copy, create derivative works, and
  11. * redistribute this software and such derivative works for any purpose,
  12. * so long as the name of the University of Michigan is not used in
  13. * any advertising or publicity pertaining to the use or distribution
  14. * of this software without specific, written prior authorization. If
  15. * the above copyright notice or any other identification of the
  16. * University of Michigan is included in any copy of any portion of
  17. * this software, then the disclaimer below must also be included.
  18. *
  19. * This software is provided as is, without representation or warranty
  20. * of any kind either express or implied, including without limitation
  21. * the implied warranties of merchantability, fitness for a particular
  22. * purpose, or noninfringement. The Regents of the University of
  23. * Michigan shall not be liable for any damages, including special,
  24. * indirect, incidental, or consequential damages, with respect to any
  25. * claim arising out of or in connection with the use of the software,
  26. * even if it has been or is hereafter advised of the possibility of
  27. * such damages.
  28. */
  29. #ifndef FS_NFS_NFS4FILELAYOUT_H
  30. #define FS_NFS_NFS4FILELAYOUT_H
  31. #include "pnfs.h"
  32. /*
  33. * Field testing shows we need to support up to 4096 stripe indices.
  34. * We store each index as a u8 (u32 on the wire) to keep the memory footprint
  35. * reasonable. This in turn means we support a maximum of 256
  36. * RFC 5661 multipath_list4 structures.
  37. */
  38. #define NFS4_PNFS_MAX_STRIPE_CNT 4096
  39. #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
  40. enum stripetype4 {
  41. STRIPE_SPARSE = 1,
  42. STRIPE_DENSE = 2
  43. };
  44. /* Individual ip address */
  45. struct nfs4_pnfs_ds_addr {
  46. struct sockaddr_storage da_addr;
  47. size_t da_addrlen;
  48. struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
  49. char *da_remotestr; /* human readable addr+port */
  50. };
  51. struct nfs4_pnfs_ds {
  52. struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
  53. char *ds_remotestr; /* comma sep list of addrs */
  54. struct list_head ds_addrs;
  55. struct nfs_client *ds_clp;
  56. atomic_t ds_count;
  57. };
  58. /* nfs4_file_layout_dsaddr flags */
  59. #define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
  60. struct nfs4_file_layout_dsaddr {
  61. struct nfs4_deviceid_node id_node;
  62. unsigned long flags;
  63. u32 stripe_count;
  64. u8 *stripe_indices;
  65. u32 ds_num;
  66. struct nfs4_pnfs_ds *ds_list[1];
  67. };
  68. struct nfs4_fl_commit_bucket {
  69. struct list_head written;
  70. struct list_head committing;
  71. };
  72. struct nfs4_filelayout_segment {
  73. struct pnfs_layout_segment generic_hdr;
  74. u32 stripe_type;
  75. u32 commit_through_mds;
  76. u32 stripe_unit;
  77. u32 first_stripe_index;
  78. u64 pattern_offset;
  79. struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
  80. unsigned int num_fh;
  81. struct nfs_fh **fh_array;
  82. struct nfs4_fl_commit_bucket *commit_buckets; /* Sort commits to ds */
  83. int number_of_buckets;
  84. };
  85. static inline struct nfs4_filelayout_segment *
  86. FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
  87. {
  88. return container_of(lseg,
  89. struct nfs4_filelayout_segment,
  90. generic_hdr);
  91. }
  92. static inline struct nfs4_deviceid_node *
  93. FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
  94. {
  95. return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
  96. }
  97. extern struct nfs_fh *
  98. nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
  99. extern void print_ds(struct nfs4_pnfs_ds *ds);
  100. u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
  101. u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
  102. struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
  103. u32 ds_idx);
  104. extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
  105. extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
  106. struct nfs4_file_layout_dsaddr *
  107. get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
  108. #endif /* FS_NFS_NFS4FILELAYOUT_H */