2 * pNFS client data structures.
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33 #include <linux/nfs_fs.h>
34 #include <linux/nfs_page.h>
37 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
38 NFS_LSEG_ROC, /* roc bit received from server */
39 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
42 struct pnfs_layout_segment {
43 struct list_head pls_list;
44 struct list_head pls_lc_list;
45 struct pnfs_layout_range pls_range;
46 atomic_t pls_refcount;
47 unsigned long pls_flags;
48 struct pnfs_layout_hdr *pls_layout;
51 enum pnfs_try_status {
53 PNFS_NOT_ATTEMPTED = 1,
56 #ifdef CONFIG_NFS_V4_1
58 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
61 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
62 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
63 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
64 NFS_LAYOUT_ROC, /* some lseg had roc bit set */
65 NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
68 enum layoutdriver_policy_flags {
69 /* Should the pNFS client commit and return the layout upon a setattr */
70 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
71 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
74 struct nfs4_deviceid_node;
76 /* Per-layout driver specific registration structure */
77 struct pnfs_layoutdriver_type {
78 struct list_head pnfs_tblid;
84 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
85 int (*clear_layoutdriver) (struct nfs_server *);
87 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
88 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
90 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
91 void (*free_lseg) (struct pnfs_layout_segment *lseg);
93 /* test for nfs page cache coalescing */
94 const struct nfs_pageio_ops *pg_read_ops;
95 const struct nfs_pageio_ops *pg_write_ops;
97 void (*mark_request_commit) (struct nfs_page *req,
98 struct pnfs_layout_segment *lseg);
99 void (*clear_request_commit) (struct nfs_page *req);
100 int (*scan_commit_lists) (struct inode *inode, int max, spinlock_t *lock);
101 int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
104 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
105 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
107 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
108 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
110 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
112 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
113 struct xdr_stream *xdr,
114 const struct nfs4_layoutreturn_args *args);
116 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
118 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
119 struct xdr_stream *xdr,
120 const struct nfs4_layoutcommit_args *args);
123 struct pnfs_layout_hdr {
124 atomic_t plh_refcount;
125 struct list_head plh_layouts; /* other client layouts */
126 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
127 struct list_head plh_segs; /* layout segments list */
128 nfs4_stateid plh_stateid;
129 atomic_t plh_outstanding; /* number of RPCs out */
130 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
131 u32 plh_barrier; /* ignore lower seqids */
132 unsigned long plh_flags;
133 loff_t plh_lwb; /* last write byte for layoutcommit */
134 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
135 struct inode *plh_inode;
139 struct nfs4_deviceid dev_id;
140 unsigned int layout_type;
141 unsigned int mincount;
147 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
149 struct pnfs_devicelist {
151 unsigned int num_devs;
152 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
155 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
156 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
159 extern int nfs4_proc_getdevicelist(struct nfs_server *server,
160 const struct nfs_fh *fh,
161 struct pnfs_devicelist *devlist);
162 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
163 struct pnfs_device *dev);
164 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
165 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
168 void get_layout_hdr(struct pnfs_layout_hdr *lo);
169 void put_lseg(struct pnfs_layout_segment *lseg);
171 bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
172 bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int);
174 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
175 void unset_pnfs_layoutdriver(struct nfs_server *);
176 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
177 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
178 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
179 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
180 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
181 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
182 int pnfs_layout_process(struct nfs4_layoutget *lgp);
183 void pnfs_free_lseg_list(struct list_head *tmp_list);
184 void pnfs_destroy_layout(struct nfs_inode *);
185 void pnfs_destroy_all_layouts(struct nfs_client *);
186 void put_layout_hdr(struct pnfs_layout_hdr *lo);
187 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
188 const nfs4_stateid *new,
189 bool update_barrier);
190 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
191 struct pnfs_layout_hdr *lo,
192 struct nfs4_state *open_state);
193 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
194 struct list_head *tmp_list,
195 struct pnfs_layout_range *recall_range);
196 bool pnfs_roc(struct inode *ino);
197 void pnfs_roc_release(struct inode *ino);
198 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
199 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
200 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
201 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
202 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
203 int _pnfs_return_layout(struct inode *);
204 void pnfs_ld_write_done(struct nfs_write_data *);
205 void pnfs_ld_read_done(struct nfs_read_data *);
206 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
207 struct nfs_open_context *ctx,
210 enum pnfs_iomode iomode,
213 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
215 /* nfs4_deviceid_flags */
217 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
221 struct nfs4_deviceid_node {
222 struct hlist_node node;
223 struct hlist_node tmpnode;
224 const struct pnfs_layoutdriver_type *ld;
225 const struct nfs_client *nfs_client;
227 struct nfs4_deviceid deviceid;
231 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
232 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
233 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
234 const struct pnfs_layoutdriver_type *,
235 const struct nfs_client *,
236 const struct nfs4_deviceid *);
237 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
238 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
239 void nfs4_deviceid_purge_client(const struct nfs_client *);
241 static inline int lo_fail_bit(u32 iomode)
243 return iomode == IOMODE_RW ?
244 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
247 static inline struct pnfs_layout_segment *
248 get_lseg(struct pnfs_layout_segment *lseg)
251 atomic_inc(&lseg->pls_refcount);
252 smp_mb__after_atomic_inc();
257 /* Return true if a layout driver is being used for this mountpoint */
258 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
260 return nfss->pnfs_curr_ld != NULL;
264 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
266 if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
267 return PNFS_NOT_ATTEMPTED;
268 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
272 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
274 struct inode *inode = req->wb_context->dentry->d_inode;
275 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
277 if (lseg == NULL || ld->mark_request_commit == NULL)
279 ld->mark_request_commit(req, lseg);
284 pnfs_clear_request_commit(struct nfs_page *req)
286 struct inode *inode = req->wb_context->dentry->d_inode;
287 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
289 if (ld == NULL || ld->clear_request_commit == NULL)
291 ld->clear_request_commit(req);
296 pnfs_scan_commit_lists(struct inode *inode, int max, spinlock_t *lock)
298 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
301 if (ld == NULL || ld->scan_commit_lists == NULL)
303 ret = ld->scan_commit_lists(inode, max, lock);
305 set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
309 /* Should the pNFS client commit and return the layout upon a setattr */
311 pnfs_ld_layoutret_on_setattr(struct inode *inode)
313 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
315 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
316 PNFS_LAYOUTRET_ON_SETATTR;
319 static inline int pnfs_return_layout(struct inode *ino)
321 struct nfs_inode *nfsi = NFS_I(ino);
322 struct nfs_server *nfss = NFS_SERVER(ino);
324 if (pnfs_enabled_sb(nfss) && nfsi->layout)
325 return _pnfs_return_layout(ino);
331 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
333 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
336 #endif /* NFS_DEBUG */
337 #else /* CONFIG_NFS_V4_1 */
339 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
343 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
347 static inline struct pnfs_layout_segment *
348 get_lseg(struct pnfs_layout_segment *lseg)
353 static inline void put_lseg(struct pnfs_layout_segment *lseg)
357 static inline int pnfs_return_layout(struct inode *ino)
363 pnfs_ld_layoutret_on_setattr(struct inode *inode)
369 pnfs_roc(struct inode *ino)
375 pnfs_roc_release(struct inode *ino)
380 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
385 pnfs_roc_drain(struct inode *ino, u32 *barrier)
390 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
391 const struct nfs_fh *mntfh, u32 id)
395 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
399 static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
404 static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
410 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
412 return PNFS_NOT_ATTEMPTED;
416 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
422 pnfs_clear_request_commit(struct nfs_page *req)
428 pnfs_scan_commit_lists(struct inode *inode, int max, spinlock_t *lock)
433 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
438 #endif /* CONFIG_NFS_V4_1 */
440 #endif /* FS_NFS_PNFS_H */