2 * pNFS client data structures.
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
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
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14 * of this software without specific, written prior authorization. If
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16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
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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,
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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
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 */
41 struct pnfs_layout_segment {
42 struct list_head pls_list;
43 struct pnfs_layout_range pls_range;
44 atomic_t pls_refcount;
45 unsigned long pls_flags;
46 struct pnfs_layout_hdr *pls_layout;
47 struct rpc_cred *pls_lc_cred; /* LAYOUTCOMMIT credential */
48 loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
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,
73 struct nfs4_deviceid_node;
75 /* Per-layout driver specific registration structure */
76 struct pnfs_layoutdriver_type {
77 struct list_head pnfs_tblid;
83 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
84 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
86 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
87 void (*free_lseg) (struct pnfs_layout_segment *lseg);
89 /* test for nfs page cache coalescing */
90 const struct nfs_pageio_ops *pg_read_ops;
91 const struct nfs_pageio_ops *pg_write_ops;
93 /* Returns true if layoutdriver wants to divert this request to
94 * driver's commit routine.
96 bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
97 struct list_head * (*choose_commit_list) (struct nfs_page *req);
98 int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
101 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
102 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
104 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
105 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
107 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
109 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
110 struct xdr_stream *xdr,
111 const struct nfs4_layoutreturn_args *args);
113 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
114 struct xdr_stream *xdr,
115 const struct nfs4_layoutcommit_args *args);
118 struct pnfs_layout_hdr {
119 atomic_t plh_refcount;
120 struct list_head plh_layouts; /* other client layouts */
121 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
122 struct list_head plh_segs; /* layout segments list */
123 nfs4_stateid plh_stateid;
124 atomic_t plh_outstanding; /* number of RPCs out */
125 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
126 u32 plh_barrier; /* ignore lower seqids */
127 unsigned long plh_flags;
128 struct inode *plh_inode;
132 struct nfs4_deviceid dev_id;
133 unsigned int layout_type;
134 unsigned int mincount;
140 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
141 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
144 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
145 struct pnfs_device *dev);
146 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
147 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
150 void get_layout_hdr(struct pnfs_layout_hdr *lo);
151 void put_lseg(struct pnfs_layout_segment *lseg);
153 bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
154 bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int);
156 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
157 void unset_pnfs_layoutdriver(struct nfs_server *);
158 enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
159 const struct rpc_call_ops *, int);
160 enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
161 const struct rpc_call_ops *);
162 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
163 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
164 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
165 int pnfs_layout_process(struct nfs4_layoutget *lgp);
166 void pnfs_free_lseg_list(struct list_head *tmp_list);
167 void pnfs_destroy_layout(struct nfs_inode *);
168 void pnfs_destroy_all_layouts(struct nfs_client *);
169 void put_layout_hdr(struct pnfs_layout_hdr *lo);
170 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
171 const nfs4_stateid *new,
172 bool update_barrier);
173 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
174 struct pnfs_layout_hdr *lo,
175 struct nfs4_state *open_state);
176 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
177 struct list_head *tmp_list,
178 struct pnfs_layout_range *recall_range);
179 bool pnfs_roc(struct inode *ino);
180 void pnfs_roc_release(struct inode *ino);
181 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
182 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
183 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
184 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
185 int _pnfs_return_layout(struct inode *);
186 int pnfs_ld_write_done(struct nfs_write_data *);
187 int pnfs_ld_read_done(struct nfs_read_data *);
190 struct nfs4_deviceid_node {
191 struct hlist_node node;
192 struct hlist_node tmpnode;
193 const struct pnfs_layoutdriver_type *ld;
194 const struct nfs_client *nfs_client;
195 struct nfs4_deviceid deviceid;
199 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
200 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
201 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
202 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
203 const struct pnfs_layoutdriver_type *,
204 const struct nfs_client *,
205 const struct nfs4_deviceid *);
206 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
207 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
208 void nfs4_deviceid_purge_client(const struct nfs_client *);
210 static inline int lo_fail_bit(u32 iomode)
212 return iomode == IOMODE_RW ?
213 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
216 static inline struct pnfs_layout_segment *
217 get_lseg(struct pnfs_layout_segment *lseg)
220 atomic_inc(&lseg->pls_refcount);
221 smp_mb__after_atomic_inc();
226 /* Return true if a layout driver is being used for this mountpoint */
227 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
229 return nfss->pnfs_curr_ld != NULL;
233 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
236 struct pnfs_layoutdriver_type *ld;
238 ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
239 if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
240 set_bit(PG_PNFS_COMMIT, &req->wb_flags);
241 req->wb_commit_lseg = get_lseg(lseg);
247 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
249 if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
250 return PNFS_NOT_ATTEMPTED;
251 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
254 static inline struct list_head *
255 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
257 struct list_head *rv;
259 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
260 struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
262 set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
263 rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
264 /* matched by ref taken when PG_PNFS_COMMIT is set */
265 put_lseg(req->wb_commit_lseg);
271 static inline void pnfs_clear_request_commit(struct nfs_page *req)
273 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
274 put_lseg(req->wb_commit_lseg);
277 /* Should the pNFS client commit and return the layout upon a setattr */
279 pnfs_ld_layoutret_on_setattr(struct inode *inode)
281 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
283 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
284 PNFS_LAYOUTRET_ON_SETATTR;
287 static inline int pnfs_return_layout(struct inode *ino)
289 struct nfs_inode *nfsi = NFS_I(ino);
290 struct nfs_server *nfss = NFS_SERVER(ino);
292 if (pnfs_enabled_sb(nfss) && nfsi->layout)
293 return _pnfs_return_layout(ino);
298 #else /* CONFIG_NFS_V4_1 */
300 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
304 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
308 static inline struct pnfs_layout_segment *
309 get_lseg(struct pnfs_layout_segment *lseg)
314 static inline void put_lseg(struct pnfs_layout_segment *lseg)
318 static inline enum pnfs_try_status
319 pnfs_try_to_read_data(struct nfs_read_data *data,
320 const struct rpc_call_ops *call_ops)
322 return PNFS_NOT_ATTEMPTED;
325 static inline enum pnfs_try_status
326 pnfs_try_to_write_data(struct nfs_write_data *data,
327 const struct rpc_call_ops *call_ops, int how)
329 return PNFS_NOT_ATTEMPTED;
332 static inline int pnfs_return_layout(struct inode *ino)
338 pnfs_ld_layoutret_on_setattr(struct inode *inode)
344 pnfs_roc(struct inode *ino)
350 pnfs_roc_release(struct inode *ino)
355 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
360 pnfs_roc_drain(struct inode *ino, u32 *barrier)
365 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
369 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
373 static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
378 static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
384 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
389 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
391 return PNFS_NOT_ATTEMPTED;
394 static inline struct list_head *
395 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
400 static inline void pnfs_clear_request_commit(struct nfs_page *req)
404 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
409 static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
412 #endif /* CONFIG_NFS_V4_1 */
414 #endif /* FS_NFS_PNFS_H */