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diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
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1/*
2 * pNFS client 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_PNFS_H
31#define FS_NFS_PNFS_H
32
33struct pnfs_layout_segment {
34 struct list_head fi_list;
35 struct pnfs_layout_range range;
36 struct kref kref;
37 struct pnfs_layout_hdr *layout;
38};
39
40#ifdef CONFIG_NFS_V4_1
41
42#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
43
44enum {
45 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
46 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
47 NFS_LAYOUT_STATEID_SET, /* have a valid layout stateid */
48};
49
50/* Per-layout driver specific registration structure */
51struct pnfs_layoutdriver_type {
52 struct list_head pnfs_tblid;
53 const u32 id;
54 const char *name;
55 struct module *owner;
56 int (*set_layoutdriver) (struct nfs_server *);
57 int (*clear_layoutdriver) (struct nfs_server *);
58 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
59 void (*free_lseg) (struct pnfs_layout_segment *lseg);
60};
61
62struct pnfs_layout_hdr {
63 unsigned long refcount;
64 struct list_head layouts; /* other client layouts */
65 struct list_head segs; /* layout segments list */
66 seqlock_t seqlock; /* Protects the stateid */
67 nfs4_stateid stateid;
68 unsigned long state;
69 struct inode *inode;
70};
71
72struct pnfs_device {
73 struct nfs4_deviceid dev_id;
74 unsigned int layout_type;
75 unsigned int mincount;
76 struct page **pages;
77 void *area;
78 unsigned int pgbase;
79 unsigned int pglen;
80};
81
82/*
83 * Device ID RCU cache. A device ID is unique per client ID and layout type.
84 */
85#define NFS4_DEVICE_ID_HASH_BITS 5
86#define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS)
87#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
88
89static inline u32
90nfs4_deviceid_hash(struct nfs4_deviceid *id)
91{
92 unsigned char *cptr = (unsigned char *)id->data;
93 unsigned int nbytes = NFS4_DEVICEID4_SIZE;
94 u32 x = 0;
95
96 while (nbytes--) {
97 x *= 37;
98 x += *cptr++;
99 }
100 return x & NFS4_DEVICE_ID_HASH_MASK;
101}
102
103struct pnfs_deviceid_node {
104 struct hlist_node de_node;
105 struct nfs4_deviceid de_id;
106 atomic_t de_ref;
107};
108
109struct pnfs_deviceid_cache {
110 spinlock_t dc_lock;
111 atomic_t dc_ref;
112 void (*dc_free_callback)(struct pnfs_deviceid_node *);
113 struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE];
114};
115
116extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *,
117 void (*free_callback)(struct pnfs_deviceid_node *));
118extern void pnfs_put_deviceid_cache(struct nfs_client *);
119extern struct pnfs_deviceid_node *pnfs_find_get_deviceid(
120 struct pnfs_deviceid_cache *,
121 struct nfs4_deviceid *);
122extern struct pnfs_deviceid_node *pnfs_add_deviceid(
123 struct pnfs_deviceid_cache *,
124 struct pnfs_deviceid_node *);
125extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
126 struct pnfs_deviceid_node *devid);
127
128extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
129extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
130
131/* nfs4proc.c */
132extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
133 struct pnfs_device *dev);
134extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
135
136/* pnfs.c */
137struct pnfs_layout_segment *
138pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
139 enum pnfs_iomode access_type);
140void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
141void unset_pnfs_layoutdriver(struct nfs_server *);
142int pnfs_layout_process(struct nfs4_layoutget *lgp);
143void pnfs_destroy_layout(struct nfs_inode *);
144void pnfs_destroy_all_layouts(struct nfs_client *);
145void put_layout_hdr(struct inode *inode);
146void pnfs_get_layout_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
147 struct nfs4_state *open_state);
148
149
150static inline int lo_fail_bit(u32 iomode)
151{
152 return iomode == IOMODE_RW ?
153 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
154}
155
156/* Return true if a layout driver is being used for this mountpoint */
157static inline int pnfs_enabled_sb(struct nfs_server *nfss)
158{
159 return nfss->pnfs_curr_ld != NULL;
160}
161
162#else /* CONFIG_NFS_V4_1 */
163
164static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
165{
166}
167
168static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
169{
170}
171
172static inline struct pnfs_layout_segment *
173pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
174 enum pnfs_iomode access_type)
175{
176 return NULL;
177}
178
179static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
180{
181}
182
183static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
184{
185}
186
187#endif /* CONFIG_NFS_V4_1 */
188
189#endif /* FS_NFS_PNFS_H */
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