blob: 31d99b2927b000a7d95afebc4df1ad4478c25096 [file] [log] [blame]
Ricardo Labiaga85e174b2010-10-20 00:17:58 -04001/*
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
Benny Halevy45df3c82011-05-05 08:28:46 +030033#include <linux/nfs_fs.h>
Fred Isaman94ad1c82011-03-01 01:34:14 +000034#include <linux/nfs_page.h>
Weston Andros Adamsone6cf82d2014-07-17 20:42:18 -040035#include <linux/workqueue.h>
Fred Isaman94ad1c82011-03-01 01:34:14 +000036
Fred Isaman4541d162011-01-06 11:36:23 +000037enum {
38 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
Fred Isamanf7e89172011-01-06 11:36:32 +000039 NFS_LSEG_ROC, /* roc bit received from server */
Peng Taoa9bae562011-07-30 20:52:33 -040040 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
Peng Tao016256d2014-09-06 00:53:23 +080041 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
Fred Isaman4541d162011-01-06 11:36:23 +000042};
43
Peng Tao875ae062014-05-29 21:06:57 +080044/* Individual ip address */
45struct nfs4_pnfs_ds_addr {
46 struct sockaddr_storage da_addr;
47 size_t da_addrlen;
48 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
49 char *da_remotestr; /* human readable addr+port */
50};
51
52struct nfs4_pnfs_ds {
53 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
54 char *ds_remotestr; /* comma sep list of addrs */
55 struct list_head ds_addrs;
56 struct nfs_client *ds_clp;
57 atomic_t ds_count;
58 unsigned long ds_state;
59#define NFS4DS_CONNECTING 0 /* ds is establishing connection */
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040060};
61
Andy Adamson974cec82010-10-20 00:18:02 -040062struct pnfs_layout_segment {
Fred Isaman566052c2011-01-06 11:36:20 +000063 struct list_head pls_list;
Peng Taoa9bae562011-07-30 20:52:33 -040064 struct list_head pls_lc_list;
Fred Isaman566052c2011-01-06 11:36:20 +000065 struct pnfs_layout_range pls_range;
Fred Isaman4541d162011-01-06 11:36:23 +000066 atomic_t pls_refcount;
Jeff Layton66755282016-05-17 12:28:40 -040067 u32 pls_seq;
Fred Isaman4541d162011-01-06 11:36:23 +000068 unsigned long pls_flags;
Fred Isaman566052c2011-01-06 11:36:20 +000069 struct pnfs_layout_hdr *pls_layout;
Weston Andros Adamsone6cf82d2014-07-17 20:42:18 -040070 struct work_struct pls_work;
Andy Adamson974cec82010-10-20 00:18:02 -040071};
72
Andy Adamson64419a92011-03-01 01:34:16 +000073enum pnfs_try_status {
74 PNFS_ATTEMPTED = 0,
75 PNFS_NOT_ATTEMPTED = 1,
Peng Taoceb11e12014-11-10 08:35:38 +080076 PNFS_TRY_AGAIN = 2,
Andy Adamson64419a92011-03-01 01:34:16 +000077};
78
Ricardo Labiaga85e174b2010-10-20 00:17:58 -040079#ifdef CONFIG_NFS_V4_1
80
81#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
82
Peng Tao39280a52014-05-30 18:15:55 +080083/*
84 * Default data server connection timeout and retrans vaules.
85 * Set by module parameters dataserver_timeo and dataserver_retrans.
86 */
87#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
88#define NFS4_DEF_DS_RETRANS 5
89
90/* error codes for internal use */
91#define NFS4ERR_RESET_TO_MDS 12001
92#define NFS4ERR_RESET_TO_PNFS 12002
93
Benny Halevye5e94012010-10-20 00:18:01 -040094enum {
95 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
96 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
Fred Isaman43f1b3d2011-01-06 11:36:30 +000097 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
Trond Myklebust2370abd2016-01-27 20:32:50 -050098 NFS_LAYOUT_RETURN, /* layoutreturn in progress */
99 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
Christoph Hellwig47abade2014-08-21 11:09:22 -0500100 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
Peng Tao9bf87482014-08-22 17:37:41 +0800101 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
Benny Halevye5e94012010-10-20 00:18:01 -0400102};
103
Benny Halevy8a1636c2010-07-14 15:43:57 -0400104enum layoutdriver_policy_flags {
Peng Tao88ac8152014-09-12 11:04:10 +0800105 /* Should the pNFS client commit and return the layout upon truncate to
106 * a smaller size */
Benny Halevy8a1636c2010-07-14 15:43:57 -0400107 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
Boaz Harroshfe0fe832012-01-06 09:31:20 +0200108 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
Christoph Hellwig612aa982014-09-10 08:23:30 -0700109 PNFS_READ_WHOLE_PAGE = 1 << 2,
Benny Halevy8a1636c2010-07-14 15:43:57 -0400110};
111
Benny Halevy1775bc32011-05-20 13:47:33 +0200112struct nfs4_deviceid_node;
113
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400114/* Per-layout driver specific registration structure */
115struct pnfs_layoutdriver_type {
Fred Isaman02c35fc2010-10-20 00:17:59 -0400116 struct list_head pnfs_tblid;
117 const u32 id;
118 const char *name;
119 struct module *owner;
Benny Halevy8a1636c2010-07-14 15:43:57 -0400120 unsigned flags;
Christoph Hellwig661373b2014-09-02 21:27:57 -0700121 unsigned max_deviceinfo_size;
Benny Halevy636fb9c2011-05-22 19:51:33 +0300122
Benny Halevy738fd0f32011-07-30 20:52:36 -0400123 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
124 int (*clear_layoutdriver) (struct nfs_server *);
125
Benny Halevy636fb9c2011-05-22 19:51:33 +0300126 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
127 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
128
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400129 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400130 void (*free_lseg) (struct pnfs_layout_segment *lseg);
Trond Myklebust03772d22015-08-25 08:54:17 -0400131 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
132 struct pnfs_layout_segment *lseg,
133 struct list_head *free_me);
Fred Isaman94ad1c82011-03-01 01:34:14 +0000134
Christoph Hellwigc88953d2014-09-10 08:23:31 -0700135 void (*return_range) (struct pnfs_layout_hdr *lo,
136 struct pnfs_layout_range *range);
137
Fred Isaman94ad1c82011-03-01 01:34:14 +0000138 /* test for nfs page cache coalescing */
Trond Myklebust1751c362011-06-10 13:30:23 -0400139 const struct nfs_pageio_ops *pg_read_ops;
140 const struct nfs_pageio_ops *pg_write_ops;
Andy Adamson64419a92011-03-01 01:34:16 +0000141
Fred Isamanea2cf222012-04-20 14:47:53 -0400142 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400143 void (*mark_request_commit) (struct nfs_page *req,
Fred Isamanea2cf222012-04-20 14:47:53 -0400144 struct pnfs_layout_segment *lseg,
Weston Andros Adamsonb57ff132014-09-05 18:20:21 -0400145 struct nfs_commit_info *cinfo,
146 u32 ds_commit_idx);
Fred Isamanea2cf222012-04-20 14:47:53 -0400147 void (*clear_request_commit) (struct nfs_page *req,
148 struct nfs_commit_info *cinfo);
149 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
150 int max);
Fred Isaman1763da12012-04-20 14:47:57 -0400151 void (*recover_commit_reqs) (struct list_head *list,
152 struct nfs_commit_info *cinfo);
Weston Andros Adamson02d14262014-07-17 20:42:17 -0400153 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
154 struct page *page);
Fred Isamanea2cf222012-04-20 14:47:53 -0400155 int (*commit_pagelist)(struct inode *inode,
156 struct list_head *mds_pages,
157 int how,
158 struct nfs_commit_info *cinfo);
Fred Isamana861a1e2011-03-23 13:27:51 +0000159
Trond Myklebust5bb89b42015-03-25 14:14:42 -0400160 int (*sync)(struct inode *inode, bool datasync);
161
Andy Adamson64419a92011-03-01 01:34:16 +0000162 /*
163 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
164 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
165 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400166 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
167 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
Benny Halevy1775bc32011-05-20 13:47:33 +0200168
169 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
Christoph Hellwig661373b2014-09-02 21:27:57 -0700170 struct nfs4_deviceid_node * (*alloc_deviceid_node)
171 (struct nfs_server *server, struct pnfs_device *pdev,
172 gfp_t gfp_flags);
Andy Adamson04a55542011-05-22 19:53:10 +0300173
174 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
175 struct xdr_stream *xdr,
176 const struct nfs4_layoutreturn_args *args);
Benny Halevyac7db722011-05-22 19:53:48 +0300177
Andy Adamsondb29c082011-07-30 20:52:38 -0400178 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
Christoph Hellwig5f919c92014-08-21 11:09:25 -0500179 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
180 void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
Benny Halevyac7db722011-05-22 19:53:48 +0300181 struct xdr_stream *xdr,
182 const struct nfs4_layoutcommit_args *args);
Peng Tao87334082015-06-23 19:51:57 +0800183 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
184 void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400185};
186
Benny Halevye5e94012010-10-20 00:18:01 -0400187struct pnfs_layout_hdr {
Fred Isamancc6e5342011-01-06 11:36:28 +0000188 atomic_t plh_refcount;
Trond Myklebust82714bd2015-08-25 08:41:24 -0400189 atomic_t plh_outstanding; /* number of RPCs out */
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000190 struct list_head plh_layouts; /* other client layouts */
Trond Myklebustfd9a8d72013-02-12 09:48:42 -0500191 struct list_head plh_bulk_destroy;
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000192 struct list_head plh_segs; /* layout segments list */
Fred Isamanf7e89172011-01-06 11:36:32 +0000193 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
Trond Myklebust25c75332012-09-18 17:01:12 -0400194 unsigned long plh_retry_timestamp;
Fred Isaman566052c2011-01-06 11:36:20 +0000195 unsigned long plh_flags;
Trond Myklebust82714bd2015-08-25 08:41:24 -0400196 nfs4_stateid plh_stateid;
197 u32 plh_barrier; /* ignore lower seqids */
Jeff Layton3982a6a2016-05-17 12:28:41 -0400198 u32 plh_return_seq;
Peng Tao016256d2014-09-06 00:53:23 +0800199 enum pnfs_iomode plh_return_iomode;
Peng Taoacff58802011-07-30 20:52:31 -0400200 loff_t plh_lwb; /* last write byte for layoutcommit */
Peng Tao9fa40752011-07-30 20:52:32 -0400201 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
Fred Isamanb7edfaa2011-01-06 11:36:21 +0000202 struct inode *plh_inode;
Benny Halevye5e94012010-10-20 00:18:01 -0400203};
204
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400205struct pnfs_device {
206 struct nfs4_deviceid dev_id;
207 unsigned int layout_type;
208 unsigned int mincount;
Andy Adamsonf1c097b2013-06-25 19:02:53 -0400209 unsigned int maxcount; /* gdia_maxcount */
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400210 struct page **pages;
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400211 unsigned int pgbase;
Andy Adamsonf1c097b2013-06-25 19:02:53 -0400212 unsigned int pglen; /* reply buffer length */
Trond Myklebustdf526992015-03-09 14:48:32 -0400213 unsigned char nocache : 1;/* May not be cached */
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400214};
215
Andy Adamson7f11d8d2011-07-30 20:52:35 -0400216#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
217
218struct pnfs_devicelist {
219 unsigned int eof;
220 unsigned int num_devs;
221 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
222};
223
Fred Isaman02c35fc2010-10-20 00:17:59 -0400224extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
225extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
226
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400227/* nfs4proc.c */
228extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
Trond Myklebustcd5875f2013-05-20 11:42:54 -0400229 struct pnfs_device *dev,
230 struct rpc_cred *cred);
Jeff Layton183d9e72016-05-17 12:28:47 -0400231extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags);
Peng Tao6c166052014-11-17 09:30:40 +0800232extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
Andy Adamsonb1f69b72010-10-20 00:18:03 -0400233
234/* pnfs.c */
Trond Myklebust70c3bd22012-09-18 20:51:13 -0400235void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
Trond Myklebust9369a432012-09-18 20:57:08 -0400236void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
Trond Myklebust6543f802014-10-08 16:39:12 -0400237void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
Trond Myklebust1751c362011-06-10 13:30:23 -0400238
Benny Halevy738fd0f32011-07-30 20:52:36 -0400239void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400240void unset_pnfs_layoutdriver(struct nfs_server *);
Trond Myklebustd8007d42011-06-10 13:30:23 -0400241void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
Trond Myklebust493292d2011-07-13 15:58:28 -0400242int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
Peng Tao62965562012-09-25 14:55:57 +0800243void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
244 struct nfs_page *req, u64 wb_size);
Weston Andros Adamson180bb5e2014-09-10 15:48:01 -0400245void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
Trond Myklebustdce81292011-07-13 15:59:19 -0400246int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
Weston Andros Adamsonb4fdac12014-05-15 11:56:43 -0400247size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
248 struct nfs_page *prev, struct nfs_page *req);
Peng Tao1b0ae062011-09-22 21:50:12 -0400249void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
Trond Myklebusta0b0a6e2012-09-17 17:12:15 -0400250struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000251void pnfs_free_lseg_list(struct list_head *tmp_list);
Benny Halevye5e94012010-10-20 00:18:01 -0400252void pnfs_destroy_layout(struct nfs_inode *);
Andy Adamson974cec82010-10-20 00:18:02 -0400253void pnfs_destroy_all_layouts(struct nfs_client *);
Trond Myklebustfd9a8d72013-02-12 09:48:42 -0500254int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
255 struct nfs_fsid *fsid,
256 bool is_recall);
257int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
258 bool is_recall);
Trond Myklebust70c3bd22012-09-18 20:51:13 -0400259void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000260void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
261 const nfs4_stateid *new,
262 bool update_barrier);
Trond Myklebust49a85062012-09-18 20:43:31 -0400263int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000264 struct list_head *tmp_list,
Jeff Layton6d597e12016-05-17 12:28:42 -0400265 const struct pnfs_layout_range *recall_range,
266 u32 seq);
Trond Myklebust10335552016-01-04 11:23:52 -0500267int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
Trond Myklebustfc7ff362015-12-28 10:28:59 -0500268 struct list_head *tmp_list,
Jeff Layton6d597e12016-05-17 12:28:42 -0400269 const struct pnfs_layout_range *recall_range,
270 u32 seq);
Trond Myklebust5f46be02016-07-22 11:25:27 -0400271int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
272 struct list_head *lseg_list);
Fred Isamanf7e89172011-01-06 11:36:32 +0000273bool pnfs_roc(struct inode *ino);
274void pnfs_roc_release(struct inode *ino);
275void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
Trond Myklebust4ff376f2015-08-18 23:23:21 -0500276void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
Peng Tao500d7012015-09-22 11:35:22 +0800277bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
Trond Myklebust67af7612015-03-25 20:40:38 -0400278void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
Andy Adamsondb29c082011-07-30 20:52:38 -0400279void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
Andy Adamsonef311532011-03-12 02:58:10 -0500280int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
Trond Myklebust5bb89b42015-03-25 14:14:42 -0400281int pnfs_generic_sync(struct inode *inode, bool datasync);
282int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
Benny Halevycbe82602011-05-22 19:52:37 +0300283int _pnfs_return_layout(struct inode *);
Trond Myklebust24028672013-03-20 13:23:33 -0400284int pnfs_commit_and_return_layout(struct inode *);
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400285void pnfs_ld_write_done(struct nfs_pgio_header *);
286void pnfs_ld_read_done(struct nfs_pgio_header *);
Weston Andros Adamson1b1bc662016-04-01 11:42:28 -0400287void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
Andy Adamson7c24d942011-06-13 18:22:38 -0400288struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
289 struct nfs_open_context *ctx,
290 loff_t pos,
291 u64 count,
292 enum pnfs_iomode iomode,
Tom Haynesc7d73af2016-05-25 07:31:14 -0700293 bool strict_iomode,
Andy Adamson7c24d942011-06-13 18:22:38 -0400294 gfp_t gfp_flags);
Tom Haynesd67ae822014-12-11 17:02:04 -0500295void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
Benny Halevye5e94012010-10-20 00:18:01 -0400296
Trond Myklebust03772d22015-08-25 08:54:17 -0400297void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
298 struct pnfs_layout_segment *lseg,
299 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
300 const struct pnfs_layout_range *old),
301 bool (*do_merge)(struct pnfs_layout_segment *lseg,
302 struct pnfs_layout_segment *old),
303 struct list_head *free_me);
304
Andy Adamsonc47abcf2011-06-15 17:52:40 -0400305void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
Weston Andros Adamson53113ad2014-06-09 11:48:38 -0400306int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
307int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
Andy Adamson82be4172012-05-23 05:02:35 -0400308struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
Peng Tao016256d2014-09-06 00:53:23 +0800309void pnfs_error_mark_layout_for_return(struct inode *inode,
310 struct pnfs_layout_segment *lseg);
Andy Adamsonc47abcf2011-06-15 17:52:40 -0400311/* nfs4_deviceid_flags */
312enum {
313 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
Trond Myklebust1dfed272012-09-18 19:51:12 -0400314 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
Trond Myklebustdf526992015-03-09 14:48:32 -0400315 NFS_DEVICEID_NOCACHE, /* device may not be cached */
Andy Adamsonc47abcf2011-06-15 17:52:40 -0400316};
317
Benny Halevya1eaecb2011-05-19 22:14:47 -0400318/* pnfs_dev.c */
319struct nfs4_deviceid_node {
320 struct hlist_node node;
Weston Andros Adamson9e3bd4e2011-05-31 21:46:50 -0400321 struct hlist_node tmpnode;
Benny Halevy1775bc32011-05-20 13:47:33 +0200322 const struct pnfs_layoutdriver_type *ld;
Benny Halevya1eaecb2011-05-19 22:14:47 -0400323 const struct nfs_client *nfs_client;
Andy Adamsonc47abcf2011-06-15 17:52:40 -0400324 unsigned long flags;
Trond Myklebust1dfed272012-09-18 19:51:12 -0400325 unsigned long timestamp_unavailable;
Benny Halevya1eaecb2011-05-19 22:14:47 -0400326 struct nfs4_deviceid deviceid;
Trond Myklebust84a80f62015-03-09 15:23:35 -0400327 struct rcu_head rcu;
Benny Halevya1eaecb2011-05-19 22:14:47 -0400328 atomic_t ref;
329};
330
Christoph Hellwig661373b2014-09-02 21:27:57 -0700331struct nfs4_deviceid_node *
332nfs4_find_get_deviceid(struct nfs_server *server,
333 const struct nfs4_deviceid *id, struct rpc_cred *cred,
334 gfp_t gfp_mask);
Benny Halevy35c8bb52011-05-24 18:04:02 +0300335void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
Christoph Hellwig661373b2014-09-02 21:27:57 -0700336void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
Benny Halevya1eaecb2011-05-19 22:14:47 -0400337 const struct nfs4_deviceid *);
Benny Halevya1eaecb2011-05-19 22:14:47 -0400338bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
Trond Myklebust1dfed272012-09-18 19:51:12 -0400339void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
340bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
Benny Halevy1775bc32011-05-20 13:47:33 +0200341void nfs4_deviceid_purge_client(const struct nfs_client *);
Benny Halevya1eaecb2011-05-19 22:14:47 -0400342
Tom Haynesf54bcf22014-12-11 15:34:59 -0500343/* pnfs_nfs.c */
344void pnfs_generic_clear_request_commit(struct nfs_page *req,
345 struct nfs_commit_info *cinfo);
346void pnfs_generic_commit_release(void *calldata);
347void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
348void pnfs_generic_rw_release(void *data);
349void pnfs_generic_recover_commit_reqs(struct list_head *dst,
350 struct nfs_commit_info *cinfo);
351int pnfs_generic_commit_pagelist(struct inode *inode,
352 struct list_head *mds_pages,
353 int how,
354 struct nfs_commit_info *cinfo,
355 int (*initiate_commit)(struct nfs_commit_data *data,
356 int how));
357int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
358void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
Peng Tao875ae062014-05-29 21:06:57 +0800359void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
360struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
361 gfp_t gfp_flags);
Peng Tao5f01d952014-05-30 18:15:59 +0800362void nfs4_pnfs_v3_ds_connect_unload(void);
Peng Tao7405f9e2014-05-29 21:06:58 +0800363void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
364 struct nfs4_deviceid_node *devid, unsigned int timeo,
Peng Tao5f01d952014-05-30 18:15:59 +0800365 unsigned int retrans, u32 version, u32 minor_version,
Peng Tao30626f92014-05-30 18:15:58 +0800366 rpc_authflavor_t au_flavor);
Peng Tao6b7f3cf2014-05-29 21:06:59 +0800367struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
368 struct xdr_stream *xdr,
369 gfp_t gfp_flags);
Tom Haynes338d00c2015-02-17 14:58:15 -0800370void pnfs_layout_mark_request_commit(struct nfs_page *req,
371 struct pnfs_layout_segment *lseg,
372 struct nfs_commit_info *cinfo,
373 u32 ds_commit_idx);
Tom Haynesf54bcf22014-12-11 15:34:59 -0500374
Trond Myklebust40dd4b72015-01-24 13:54:37 -0500375static inline bool nfs_have_layout(struct inode *inode)
376{
377 return NFS_I(inode)->layout != NULL;
378}
379
Trond Myklebust45fcc7b2016-07-24 12:26:34 -0400380static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
381{
382 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
383}
384
Christoph Hellwig30ff0602014-09-02 21:27:59 -0700385static inline struct nfs4_deviceid_node *
386nfs4_get_deviceid(struct nfs4_deviceid_node *d)
387{
388 atomic_inc(&d->ref);
389 return d;
390}
391
Fred Isamand684d2a2011-03-01 01:34:13 +0000392static inline struct pnfs_layout_segment *
Trond Myklebust9369a432012-09-18 20:57:08 -0400393pnfs_get_lseg(struct pnfs_layout_segment *lseg)
Fred Isamand684d2a2011-03-01 01:34:13 +0000394{
395 if (lseg) {
396 atomic_inc(&lseg->pls_refcount);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100397 smp_mb__after_atomic();
Fred Isamand684d2a2011-03-01 01:34:13 +0000398 }
399 return lseg;
400}
401
Trond Myklebustb20135d2015-12-31 09:28:06 -0500402static inline bool
403pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
404{
405 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
406}
407
Benny Halevye5e94012010-10-20 00:18:01 -0400408/* Return true if a layout driver is being used for this mountpoint */
409static inline int pnfs_enabled_sb(struct nfs_server *nfss)
410{
411 return nfss->pnfs_curr_ld != NULL;
412}
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400413
Fred Isamana861a1e2011-03-23 13:27:51 +0000414static inline int
Fred Isamanea2cf222012-04-20 14:47:53 -0400415pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
416 struct nfs_commit_info *cinfo)
Fred Isamana861a1e2011-03-23 13:27:51 +0000417{
Fred Isamanea2cf222012-04-20 14:47:53 -0400418 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
Fred Isamana861a1e2011-03-23 13:27:51 +0000419 return PNFS_NOT_ATTEMPTED;
Fred Isamanea2cf222012-04-20 14:47:53 -0400420 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
421}
422
423static inline struct pnfs_ds_commit_info *
424pnfs_get_ds_info(struct inode *inode)
425{
426 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
427
428 if (ld == NULL || ld->get_ds_info == NULL)
429 return NULL;
430 return ld->get_ds_info(inode);
Fred Isamana861a1e2011-03-23 13:27:51 +0000431}
432
Tom Haynesf54bcf22014-12-11 15:34:59 -0500433static inline void
434pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
435{
436 set_bit(NFS_DEVICEID_INVALID, &node->flags);
437}
438
Trond Myklebust8dd37752012-03-15 17:16:40 -0400439static inline bool
Fred Isamanea2cf222012-04-20 14:47:53 -0400440pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
Weston Andros Adamsonb57ff132014-09-05 18:20:21 -0400441 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
Fred Isamana861a1e2011-03-23 13:27:51 +0000442{
David Howells2b0143b2015-03-17 22:25:59 +0000443 struct inode *inode = d_inode(req->wb_context->dentry);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400444 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
Fred Isamana861a1e2011-03-23 13:27:51 +0000445
Trond Myklebust8dd37752012-03-15 17:16:40 -0400446 if (lseg == NULL || ld->mark_request_commit == NULL)
447 return false;
Weston Andros Adamsonb57ff132014-09-05 18:20:21 -0400448 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400449 return true;
Fred Isamana861a1e2011-03-23 13:27:51 +0000450}
451
Trond Myklebust8dd37752012-03-15 17:16:40 -0400452static inline bool
Fred Isamanea2cf222012-04-20 14:47:53 -0400453pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
Fred Isamana861a1e2011-03-23 13:27:51 +0000454{
David Howells2b0143b2015-03-17 22:25:59 +0000455 struct inode *inode = d_inode(req->wb_context->dentry);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400456 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500457
Trond Myklebust8dd37752012-03-15 17:16:40 -0400458 if (ld == NULL || ld->clear_request_commit == NULL)
459 return false;
Fred Isamanea2cf222012-04-20 14:47:53 -0400460 ld->clear_request_commit(req, cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400461 return true;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500462}
463
464static inline int
Fred Isamanea2cf222012-04-20 14:47:53 -0400465pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
466 int max)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500467{
Fred Isamanea2cf222012-04-20 14:47:53 -0400468 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500469 return 0;
Fred Isamanea2cf222012-04-20 14:47:53 -0400470 else
471 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
Fred Isamana861a1e2011-03-23 13:27:51 +0000472}
473
Weston Andros Adamson02d14262014-07-17 20:42:17 -0400474static inline struct nfs_page *
475pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
476 struct page *page)
477{
478 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
479
480 if (ld == NULL || ld->search_commit_reqs == NULL)
481 return NULL;
482 return ld->search_commit_reqs(cinfo, page);
483}
484
Benny Halevy8a1636c2010-07-14 15:43:57 -0400485/* Should the pNFS client commit and return the layout upon a setattr */
486static inline bool
487pnfs_ld_layoutret_on_setattr(struct inode *inode)
488{
489 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
490 return false;
491 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
492 PNFS_LAYOUTRET_ON_SETATTR;
493}
494
Trond Myklebustd8c951c2014-01-13 12:08:11 -0500495static inline bool
Christoph Hellwig612aa982014-09-10 08:23:30 -0700496pnfs_ld_read_whole_page(struct inode *inode)
497{
498 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
499 return false;
500 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
501}
502
Trond Myklebust5bb89b42015-03-25 14:14:42 -0400503static inline int
504pnfs_sync_inode(struct inode *inode, bool datasync)
505{
506 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
507 return 0;
508 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
509}
510
Christoph Hellwig612aa982014-09-10 08:23:30 -0700511static inline bool
Trond Myklebustd8c951c2014-01-13 12:08:11 -0500512pnfs_layoutcommit_outstanding(struct inode *inode)
513{
514 struct nfs_inode *nfsi = NFS_I(inode);
515
516 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
517 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
518}
519
Benny Halevycbe82602011-05-22 19:52:37 +0300520static inline int pnfs_return_layout(struct inode *ino)
521{
522 struct nfs_inode *nfsi = NFS_I(ino);
523 struct nfs_server *nfss = NFS_SERVER(ino);
524
525 if (pnfs_enabled_sb(nfss) && nfsi->layout)
526 return _pnfs_return_layout(ino);
527
528 return 0;
529}
530
Andy Adamson82be4172012-05-23 05:02:35 -0400531static inline bool
532pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
533 struct nfs_server *nfss)
534{
Fred Isamanfb47ddc2012-06-07 11:42:12 -0400535 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
Andy Adamson82be4172012-05-23 05:02:35 -0400536 nfss->pnfs_curr_ld->id == src->l_type);
537}
538
Trond Myklebust0762ed22015-08-25 17:38:25 -0400539static inline u64
540pnfs_calc_offset_end(u64 offset, u64 len)
541{
542 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
543 return NFS4_MAX_UINT64;
544 return offset + len - 1;
545}
546
547static inline u64
548pnfs_calc_offset_length(u64 offset, u64 end)
549{
550 if (end == NFS4_MAX_UINT64 || end <= offset)
551 return NFS4_MAX_UINT64;
552 return 1 + end - offset;
553}
554
Trond Myklebuste144e532016-01-04 12:52:53 -0500555static inline void
556pnfs_copy_range(struct pnfs_layout_range *dst,
557 const struct pnfs_layout_range *src)
558{
559 memcpy(dst, src, sizeof(*dst));
560}
561
Trond Myklebustbbf58bf2015-08-24 20:39:18 -0400562extern unsigned int layoutstats_timer;
563
Trond Myklebust6f008662012-03-20 14:12:46 -0400564#ifdef NFS_DEBUG
565void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
566#else
567static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
568{
569}
Trond Myklebustbbf58bf2015-08-24 20:39:18 -0400570
Trond Myklebust6f008662012-03-20 14:12:46 -0400571#endif /* NFS_DEBUG */
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400572#else /* CONFIG_NFS_V4_1 */
573
Trond Myklebust40dd4b72015-01-24 13:54:37 -0500574static inline bool nfs_have_layout(struct inode *inode)
575{
576 return false;
577}
578
Andy Adamson974cec82010-10-20 00:18:02 -0400579static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
580{
581}
582
Benny Halevye5e94012010-10-20 00:18:01 -0400583static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
584{
585}
586
587static inline struct pnfs_layout_segment *
Trond Myklebust9369a432012-09-18 20:57:08 -0400588pnfs_get_lseg(struct pnfs_layout_segment *lseg)
Fred Isamand684d2a2011-03-01 01:34:13 +0000589{
590 return NULL;
591}
592
Trond Myklebust9369a432012-09-18 20:57:08 -0400593static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
Fred Isamand684d2a2011-03-01 01:34:13 +0000594{
595}
596
Benny Halevycbe82602011-05-22 19:52:37 +0300597static inline int pnfs_return_layout(struct inode *ino)
598{
599 return 0;
600}
601
Trond Myklebust24028672013-03-20 13:23:33 -0400602static inline int pnfs_commit_and_return_layout(struct inode *inode)
603{
604 return 0;
605}
606
Fred Isamanf7e89172011-01-06 11:36:32 +0000607static inline bool
Benny Halevy8a1636c2010-07-14 15:43:57 -0400608pnfs_ld_layoutret_on_setattr(struct inode *inode)
609{
610 return false;
611}
612
613static inline bool
Christoph Hellwig612aa982014-09-10 08:23:30 -0700614pnfs_ld_read_whole_page(struct inode *inode)
615{
616 return false;
617}
618
Trond Myklebust5bb89b42015-03-25 14:14:42 -0400619static inline int
620pnfs_sync_inode(struct inode *inode, bool datasync)
621{
622 return 0;
623}
624
Christoph Hellwig612aa982014-09-10 08:23:30 -0700625static inline bool
Trond Myklebust10b7e9a2016-07-18 00:51:01 -0400626pnfs_layoutcommit_outstanding(struct inode *inode)
627{
628 return false;
629}
630
631
632static inline bool
Fred Isamanf7e89172011-01-06 11:36:32 +0000633pnfs_roc(struct inode *ino)
634{
635 return false;
636}
637
638static inline void
639pnfs_roc_release(struct inode *ino)
640{
641}
642
643static inline void
644pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
645{
646}
647
Trond Myklebust4ff376f2015-08-18 23:23:21 -0500648static inline void
649pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
Fred Isamanf7e89172011-01-06 11:36:32 +0000650{
Fred Isamanf7e89172011-01-06 11:36:32 +0000651}
652
Peng Tao500d7012015-09-22 11:35:22 +0800653static inline bool
654pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
655{
656 return false;
657}
658
Benny Halevy738fd0f32011-07-30 20:52:36 -0400659static inline void set_pnfs_layoutdriver(struct nfs_server *s,
Trond Myklebusta00ed252011-07-31 16:39:04 -0400660 const struct nfs_fh *mntfh, u32 id)
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400661{
662}
663
664static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
665{
666}
667
Fred Isamana861a1e2011-03-23 13:27:51 +0000668static inline int
Fred Isamanea2cf222012-04-20 14:47:53 -0400669pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
670 struct nfs_commit_info *cinfo)
Fred Isamana861a1e2011-03-23 13:27:51 +0000671{
672 return PNFS_NOT_ATTEMPTED;
673}
674
Fred Isamanea2cf222012-04-20 14:47:53 -0400675static inline struct pnfs_ds_commit_info *
676pnfs_get_ds_info(struct inode *inode)
677{
678 return NULL;
679}
680
Trond Myklebust8dd37752012-03-15 17:16:40 -0400681static inline bool
Fred Isamanea2cf222012-04-20 14:47:53 -0400682pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
Weston Andros Adamsonb57ff132014-09-05 18:20:21 -0400683 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
Fred Isamana861a1e2011-03-23 13:27:51 +0000684{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400685 return false;
Fred Isamana861a1e2011-03-23 13:27:51 +0000686}
687
Trond Myklebust8dd37752012-03-15 17:16:40 -0400688static inline bool
Fred Isamanea2cf222012-04-20 14:47:53 -0400689pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
Fred Isamana861a1e2011-03-23 13:27:51 +0000690{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400691 return false;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500692}
693
694static inline int
Fred Isamanea2cf222012-04-20 14:47:53 -0400695pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
696 int max)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500697{
698 return 0;
Fred Isamana861a1e2011-03-23 13:27:51 +0000699}
700
Weston Andros Adamson02d14262014-07-17 20:42:17 -0400701static inline struct nfs_page *
702pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
703 struct page *page)
704{
705 return NULL;
706}
707
Andy Adamsonef311532011-03-12 02:58:10 -0500708static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
Andy Adamson863a3c62011-03-23 13:27:54 +0000709{
710 return 0;
711}
Benny Halevy1775bc32011-05-20 13:47:33 +0200712
Andy Adamson82be4172012-05-23 05:02:35 -0400713static inline bool
714pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
715 struct nfs_server *nfss)
716{
717 return false;
718}
719
720static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
721{
722 return NULL;
723}
724
Peng Tao5f01d952014-05-30 18:15:59 +0800725static inline void nfs4_pnfs_v3_ds_connect_unload(void)
726{
727}
728
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400729#endif /* CONFIG_NFS_V4_1 */
730
Peng Tao865a7ec2015-06-25 18:19:32 +0800731#if IS_ENABLED(CONFIG_NFS_V4_2)
Trond Myklebustc8ad8892015-08-05 17:31:58 -0400732int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
Peng Tao865a7ec2015-06-25 18:19:32 +0800733#else
734static inline int
Trond Myklebustc8ad8892015-08-05 17:31:58 -0400735pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
Peng Tao865a7ec2015-06-25 18:19:32 +0800736{
737 return 0;
738}
739#endif
740
Ricardo Labiaga85e174b2010-10-20 00:17:58 -0400741#endif /* FS_NFS_PNFS_H */