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30#ifndef FS_NFS_PNFS_H
31#define FS_NFS_PNFS_H
32
33enum {
34 NFS_LSEG_VALID = 0,
35 NFS_LSEG_ROC,
36};
37
38struct pnfs_layout_segment {
39 struct list_head pls_list;
40 struct pnfs_layout_range pls_range;
41 atomic_t pls_refcount;
42 unsigned long pls_flags;
43 struct pnfs_layout_hdr *pls_layout;
44};
45
46#ifdef CONFIG_NFS_V4_1
47
48#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
49
50enum {
51 NFS_LAYOUT_RO_FAILED = 0,
52 NFS_LAYOUT_RW_FAILED,
53 NFS_LAYOUT_BULK_RECALL,
54 NFS_LAYOUT_ROC,
55 NFS_LAYOUT_DESTROYED,
56};
57
58
59struct pnfs_layoutdriver_type {
60 struct list_head pnfs_tblid;
61 const u32 id;
62 const char *name;
63 struct module *owner;
64 int (*set_layoutdriver) (struct nfs_server *);
65 int (*clear_layoutdriver) (struct nfs_server *);
66 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
67 void (*free_lseg) (struct pnfs_layout_segment *lseg);
68};
69
70struct pnfs_layout_hdr {
71 atomic_t plh_refcount;
72 struct list_head plh_layouts;
73 struct list_head plh_bulk_recall;
74 struct list_head plh_segs;
75 nfs4_stateid plh_stateid;
76 atomic_t plh_outstanding;
77 unsigned long plh_block_lgets;
78 u32 plh_barrier;
79 unsigned long plh_flags;
80 struct inode *plh_inode;
81};
82
83struct pnfs_device {
84 struct nfs4_deviceid dev_id;
85 unsigned int layout_type;
86 unsigned int mincount;
87 struct page **pages;
88 void *area;
89 unsigned int pgbase;
90 unsigned int pglen;
91};
92
93
94
95
96#define NFS4_DEVICE_ID_HASH_BITS 5
97#define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS)
98#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
99
100static inline u32
101nfs4_deviceid_hash(struct nfs4_deviceid *id)
102{
103 unsigned char *cptr = (unsigned char *)id->data;
104 unsigned int nbytes = NFS4_DEVICEID4_SIZE;
105 u32 x = 0;
106
107 while (nbytes--) {
108 x *= 37;
109 x += *cptr++;
110 }
111 return x & NFS4_DEVICE_ID_HASH_MASK;
112}
113
114struct pnfs_deviceid_node {
115 struct hlist_node de_node;
116 struct nfs4_deviceid de_id;
117 atomic_t de_ref;
118};
119
120struct pnfs_deviceid_cache {
121 spinlock_t dc_lock;
122 atomic_t dc_ref;
123 void (*dc_free_callback)(struct pnfs_deviceid_node *);
124 struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE];
125};
126
127extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *,
128 void (*free_callback)(struct pnfs_deviceid_node *));
129extern void pnfs_put_deviceid_cache(struct nfs_client *);
130extern struct pnfs_deviceid_node *pnfs_find_get_deviceid(
131 struct pnfs_deviceid_cache *,
132 struct nfs4_deviceid *);
133extern struct pnfs_deviceid_node *pnfs_add_deviceid(
134 struct pnfs_deviceid_cache *,
135 struct pnfs_deviceid_node *);
136extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
137 struct pnfs_deviceid_node *devid);
138
139extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
140extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
141
142
143extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
144 struct pnfs_device *dev);
145extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
146
147
148void get_layout_hdr(struct pnfs_layout_hdr *lo);
149struct pnfs_layout_segment *
150pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
151 enum pnfs_iomode access_type);
152void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
153void unset_pnfs_layoutdriver(struct nfs_server *);
154int pnfs_layout_process(struct nfs4_layoutget *lgp);
155void pnfs_free_lseg_list(struct list_head *tmp_list);
156void pnfs_destroy_layout(struct nfs_inode *);
157void pnfs_destroy_all_layouts(struct nfs_client *);
158void put_layout_hdr(struct pnfs_layout_hdr *lo);
159void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
160 const nfs4_stateid *new,
161 bool update_barrier);
162int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
163 struct pnfs_layout_hdr *lo,
164 struct nfs4_state *open_state);
165int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
166 struct list_head *tmp_list,
167 u32 iomode);
168bool pnfs_roc(struct inode *ino);
169void pnfs_roc_release(struct inode *ino);
170void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
171bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
172
173
174static inline int lo_fail_bit(u32 iomode)
175{
176 return iomode == IOMODE_RW ?
177 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
178}
179
180
181static inline int pnfs_enabled_sb(struct nfs_server *nfss)
182{
183 return nfss->pnfs_curr_ld != NULL;
184}
185
186#else
187
188static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
189{
190}
191
192static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
193{
194}
195
196static inline struct pnfs_layout_segment *
197pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
198 enum pnfs_iomode access_type)
199{
200 return NULL;
201}
202
203static inline bool
204pnfs_roc(struct inode *ino)
205{
206 return false;
207}
208
209static inline void
210pnfs_roc_release(struct inode *ino)
211{
212}
213
214static inline void
215pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
216{
217}
218
219static inline bool
220pnfs_roc_drain(struct inode *ino, u32 *barrier)
221{
222 return false;
223}
224
225static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
226{
227}
228
229static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
230{
231}
232
233#endif
234
235#endif
236
