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Andy Adamson16b374c2010-10-20 00:18:04 -04001/*
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
30#ifndef FS_NFS_NFS4FILELAYOUT_H
31#define FS_NFS_NFS4FILELAYOUT_H
32
33#include "pnfs.h"
34
35/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -030036 * Field testing shows we need to support up to 4096 stripe indices.
Andy Adamson16b374c2010-10-20 00:18:04 -040037 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
38 * reasonable. This in turn means we support a maximum of 256
39 * RFC 5661 multipath_list4 structures.
40 */
41#define NFS4_PNFS_MAX_STRIPE_CNT 4096
42#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
43
44enum stripetype4 {
45 STRIPE_SPARSE = 1,
46 STRIPE_DENSE = 2
47};
48
49/* Individual ip address */
50struct nfs4_pnfs_ds {
51 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
52 u32 ds_ip_addr;
53 u32 ds_port;
54 struct nfs_client *ds_clp;
55 atomic_t ds_count;
56};
57
Andy Adamson568e8c42011-03-01 01:34:22 +000058/* nfs4_file_layout_dsaddr flags */
59#define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
60
Andy Adamson16b374c2010-10-20 00:18:04 -040061struct nfs4_file_layout_dsaddr {
Christoph Hellwigea8eecd2011-03-01 01:34:21 +000062 struct hlist_node node;
Benny Halevy67d51f62011-05-20 10:45:05 +020063 struct nfs_client *nfs_client;
Christoph Hellwigea8eecd2011-03-01 01:34:21 +000064 struct nfs4_deviceid deviceid;
65 atomic_t ref;
Andy Adamson568e8c42011-03-01 01:34:22 +000066 unsigned long flags;
Andy Adamson16b374c2010-10-20 00:18:04 -040067 u32 stripe_count;
68 u8 *stripe_indices;
69 u32 ds_num;
70 struct nfs4_pnfs_ds *ds_list[1];
71};
72
73struct nfs4_filelayout_segment {
74 struct pnfs_layout_segment generic_hdr;
75 u32 stripe_type;
76 u32 commit_through_mds;
77 u32 stripe_unit;
78 u32 first_stripe_index;
79 u64 pattern_offset;
80 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
81 unsigned int num_fh;
82 struct nfs_fh **fh_array;
Fred Isaman425eb732011-03-23 13:27:50 +000083 struct list_head *commit_buckets; /* Sort commits to ds */
84 int number_of_buckets;
Andy Adamson16b374c2010-10-20 00:18:04 -040085};
86
87static inline struct nfs4_filelayout_segment *
88FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
89{
90 return container_of(lseg,
91 struct nfs4_filelayout_segment,
92 generic_hdr);
93}
94
Fred Isamancfe7f412011-03-01 01:34:18 +000095extern struct nfs_fh *
96nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
97
Andy Adamson16b374c2010-10-20 00:18:04 -040098extern void print_ds(struct nfs4_pnfs_ds *ds);
99extern void print_deviceid(struct nfs4_deviceid *dev_id);
Fred Isamancfe7f412011-03-01 01:34:18 +0000100u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
101u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
102struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
103 u32 ds_idx);
Andy Adamson16b374c2010-10-20 00:18:04 -0400104extern struct nfs4_file_layout_dsaddr *
Benny Halevy67d51f62011-05-20 10:45:05 +0200105nfs4_fl_find_get_deviceid(struct nfs_client *, struct nfs4_deviceid *dev_id);
Christoph Hellwigea8eecd2011-03-01 01:34:21 +0000106extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
Andy Adamson16b374c2010-10-20 00:18:04 -0400107struct nfs4_file_layout_dsaddr *
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400108get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
Andy Adamson16b374c2010-10-20 00:18:04 -0400109
110#endif /* FS_NFS_NFS4FILELAYOUT_H */