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
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.
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,
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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 struct nfs4_deviceid_node;
70 /* Per-layout driver specific registration structure */
71 struct pnfs_layoutdriver_type {
72 struct list_head pnfs_tblid;
77 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
78 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
80 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
81 void (*free_lseg) (struct pnfs_layout_segment *lseg);
83 /* test for nfs page cache coalescing */
84 int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
86 /* Returns true if layoutdriver wants to divert this request to
87 * driver's commit routine.
89 bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
90 struct list_head * (*choose_commit_list) (struct nfs_page *req);
91 int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
94 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
95 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
97 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
98 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
100 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
103 struct pnfs_layout_hdr {
104 atomic_t plh_refcount;
105 struct list_head plh_layouts; /* other client layouts */
106 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
107 struct list_head plh_segs; /* layout segments list */
108 nfs4_stateid plh_stateid;
109 atomic_t plh_outstanding; /* number of RPCs out */
110 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
111 u32 plh_barrier; /* ignore lower seqids */
112 unsigned long plh_flags;
113 struct inode *plh_inode;
117 struct nfs4_deviceid dev_id;
118 unsigned int layout_type;
119 unsigned int mincount;
125 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
126 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
129 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
130 struct pnfs_device *dev);
131 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
132 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
135 void get_layout_hdr(struct pnfs_layout_hdr *lo);
136 void put_lseg(struct pnfs_layout_segment *lseg);
137 struct pnfs_layout_segment *
138 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
139 loff_t pos, u64 count, enum pnfs_iomode access_type,
141 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
142 void unset_pnfs_layoutdriver(struct nfs_server *);
143 enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
144 const struct rpc_call_ops *, int);
145 enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
146 const struct rpc_call_ops *);
147 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
148 void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *);
149 int pnfs_layout_process(struct nfs4_layoutget *lgp);
150 void pnfs_free_lseg_list(struct list_head *tmp_list);
151 void pnfs_destroy_layout(struct nfs_inode *);
152 void pnfs_destroy_all_layouts(struct nfs_client *);
153 void put_layout_hdr(struct pnfs_layout_hdr *lo);
154 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
155 const nfs4_stateid *new,
156 bool update_barrier);
157 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
158 struct pnfs_layout_hdr *lo,
159 struct nfs4_state *open_state);
160 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
161 struct list_head *tmp_list,
162 struct pnfs_layout_range *recall_range);
163 bool pnfs_roc(struct inode *ino);
164 void pnfs_roc_release(struct inode *ino);
165 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
166 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
167 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
168 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
169 int _pnfs_return_layout(struct inode *);
170 int pnfs_ld_write_done(struct nfs_write_data *);
171 int pnfs_ld_read_done(struct nfs_read_data *);
174 struct nfs4_deviceid_node {
175 struct hlist_node node;
176 const struct pnfs_layoutdriver_type *ld;
177 const struct nfs_client *nfs_client;
178 struct nfs4_deviceid deviceid;
182 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
183 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
184 struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
185 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
186 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
187 const struct pnfs_layoutdriver_type *,
188 const struct nfs_client *,
189 const struct nfs4_deviceid *);
190 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
191 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
192 void nfs4_deviceid_purge_client(const struct nfs_client *);
194 static inline int lo_fail_bit(u32 iomode)
196 return iomode == IOMODE_RW ?
197 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
200 static inline struct pnfs_layout_segment *
201 get_lseg(struct pnfs_layout_segment *lseg)
204 atomic_inc(&lseg->pls_refcount);
205 smp_mb__after_atomic_inc();
210 /* Return true if a layout driver is being used for this mountpoint */
211 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
213 return nfss->pnfs_curr_ld != NULL;
217 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
220 struct pnfs_layoutdriver_type *ld;
222 ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
223 if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
224 set_bit(PG_PNFS_COMMIT, &req->wb_flags);
225 req->wb_commit_lseg = get_lseg(lseg);
231 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
233 if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
234 return PNFS_NOT_ATTEMPTED;
235 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
238 static inline struct list_head *
239 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
241 struct list_head *rv;
243 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
244 struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
246 set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
247 rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
248 /* matched by ref taken when PG_PNFS_COMMIT is set */
249 put_lseg(req->wb_commit_lseg);
255 static inline void pnfs_clear_request_commit(struct nfs_page *req)
257 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
258 put_lseg(req->wb_commit_lseg);
261 static inline int pnfs_return_layout(struct inode *ino)
263 struct nfs_inode *nfsi = NFS_I(ino);
264 struct nfs_server *nfss = NFS_SERVER(ino);
266 if (pnfs_enabled_sb(nfss) && nfsi->layout)
267 return _pnfs_return_layout(ino);
272 #else /* CONFIG_NFS_V4_1 */
274 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
278 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
282 static inline struct pnfs_layout_segment *
283 get_lseg(struct pnfs_layout_segment *lseg)
288 static inline void put_lseg(struct pnfs_layout_segment *lseg)
292 static inline struct pnfs_layout_segment *
293 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
294 loff_t pos, u64 count, enum pnfs_iomode access_type,
300 static inline enum pnfs_try_status
301 pnfs_try_to_read_data(struct nfs_read_data *data,
302 const struct rpc_call_ops *call_ops)
304 return PNFS_NOT_ATTEMPTED;
307 static inline enum pnfs_try_status
308 pnfs_try_to_write_data(struct nfs_write_data *data,
309 const struct rpc_call_ops *call_ops, int how)
311 return PNFS_NOT_ATTEMPTED;
314 static inline int pnfs_return_layout(struct inode *ino)
320 pnfs_roc(struct inode *ino)
326 pnfs_roc_release(struct inode *ino)
331 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
336 pnfs_roc_drain(struct inode *ino, u32 *barrier)
341 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
345 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
350 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
352 pgio->pg_test = NULL;
356 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
358 pgio->pg_test = NULL;
362 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
367 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
369 return PNFS_NOT_ATTEMPTED;
372 static inline struct list_head *
373 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
378 static inline void pnfs_clear_request_commit(struct nfs_page *req)
382 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
387 static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
390 #endif /* CONFIG_NFS_V4_1 */
392 #endif /* FS_NFS_PNFS_H */