blob: b777bdaba4c52e72ee86a1d6c1e67ec381a37788 [file] [log] [blame]
David Howellsf7b422b2006-06-09 09:34:33 -04001/*
2 * NFS internal definitions
3 */
4
Andy Adamsoneedc0202009-04-01 09:22:41 -04005#include "nfs4_fs.h"
David Howellsf7b422b2006-06-09 09:34:33 -04006#include <linux/mount.h>
Eric Parisf9c3a382008-03-05 14:20:18 -05007#include <linux/security.h>
David Howellsf7b422b2006-06-09 09:34:33 -04008
David Howells08734042009-04-03 16:42:42 +01009#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
10
David Howells54ceac42006-08-22 20:06:13 -040011struct nfs_string;
David Howells54ceac42006-08-22 20:06:13 -040012
13/* Maximum number of readahead requests
14 * FIXME: this should really be a sysctl so that users may tune it to suit
15 * their needs. People that do NFS over a slow network, might for
16 * instance want to reduce it to something closer to 1 for improved
17 * interactive response.
18 */
19#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
20
Andy Adamsoneedc0202009-04-01 09:22:41 -040021/*
22 * Determine if sessions are in use.
23 */
24static inline int nfs4_has_session(const struct nfs_client *clp)
25{
26#ifdef CONFIG_NFS_V4_1
27 if (clp->cl_session)
28 return 1;
29#endif /* CONFIG_NFS_V4_1 */
30 return 0;
31}
32
Alexandros Batsakisd8cb1a72009-12-05 13:29:53 -050033static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
34{
35#ifdef CONFIG_NFS_V4_1
36 if (nfs4_has_session(clp))
37 return (clp->cl_session->flags & SESSION4_PERSIST);
38#endif /* CONFIG_NFS_V4_1 */
39 return 0;
40}
41
Bryan Schumaker7ebb9312011-03-24 17:12:30 +000042static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
43{
44 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
45 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
46}
47
Andy Adamson533eb462011-06-13 18:25:56 -040048static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
49{
50 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
51 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
52 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
53 return 0;
54
55 fattr->fileid = fattr->mounted_on_fileid;
56 return 1;
57}
58
David Howellsf7b422b2006-06-09 09:34:33 -040059struct nfs_clone_mount {
60 const struct super_block *sb;
61 const struct dentry *dentry;
62 struct nfs_fh *fh;
63 struct nfs_fattr *fattr;
64 char *hostname;
65 char *mnt_path;
Chuck Lever6677d092007-12-10 14:59:06 -050066 struct sockaddr *addr;
67 size_t addrlen;
David Howellsf7b422b2006-06-09 09:34:33 -040068 rpc_authflavor_t authflavor;
69};
70
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -040071/*
Chuck Levera14017d2009-06-17 18:02:12 -070072 * Note: RFC 1813 doesn't limit the number of auth flavors that
73 * a server can return, so make something up.
74 */
75#define NFS_MAX_SECFLAVORS (12)
76
77/*
Chuck Lever4cfd74f2009-09-08 19:49:47 -040078 * Value used if the user did not specify a port value.
79 */
80#define NFS_UNSPEC_PORT (-1)
81
82/*
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -040083 * Maximum number of pages that readdir can use for creating
84 * a vmapped array of pages.
85 */
86#define NFS_MAX_READDIR_PAGES 8
87
88/*
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -040089 * In-kernel mount arguments
90 */
91struct nfs_parsed_mount_data {
92 int flags;
93 int rsize, wsize;
94 int timeo, retrans;
95 int acregmin, acregmax,
96 acdirmin, acdirmax;
97 int namlen;
David Howellsb797cac2009-04-03 16:42:48 +010098 unsigned int options;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -040099 unsigned int bsize;
100 unsigned int auth_flavor_len;
101 rpc_authflavor_t auth_flavors[1];
102 char *client_address;
Chuck Lever764302c2009-09-08 19:50:03 -0400103 unsigned int version;
Mike Sager3fd5be92009-04-01 09:21:48 -0400104 unsigned int minorversion;
David Howells08734042009-04-03 16:42:42 +0100105 char *fscache_uniq;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400106
107 struct {
Chuck Lever4c568012007-12-10 14:59:28 -0500108 struct sockaddr_storage address;
109 size_t addrlen;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400110 char *hostname;
Chuck Lever78fa7012008-03-14 14:10:15 -0400111 u32 version;
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400112 int port;
Chuck Lever78fa7012008-03-14 14:10:15 -0400113 unsigned short protocol;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400114 } mount_server;
115
116 struct {
Chuck Lever4c568012007-12-10 14:59:28 -0500117 struct sockaddr_storage address;
118 size_t addrlen;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400119 char *hostname;
120 char *export_path;
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400121 int port;
Chuck Lever78fa7012008-03-14 14:10:15 -0400122 unsigned short protocol;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400123 } nfs_server;
Eric Parisf9c3a382008-03-05 14:20:18 -0500124
125 struct security_mnt_opts lsm_opts;
Stanislav Kinsburskye50a7a12012-01-10 16:12:46 +0400126 struct net *net;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400127};
128
Chuck Lever146ec942008-12-23 15:21:34 -0500129/* mount_clnt.c */
Chuck Leverc5d120f2008-12-23 15:21:35 -0500130struct nfs_mount_request {
131 struct sockaddr *sap;
132 size_t salen;
133 char *hostname;
134 char *dirpath;
135 u32 version;
136 unsigned short protocol;
137 struct nfs_fh *fh;
Chuck Lever50a737f2008-12-23 15:21:37 -0500138 int noresvport;
Chuck Lever8e02f6b2009-06-17 18:02:13 -0700139 unsigned int *auth_flav_len;
140 rpc_authflavor_t *auth_flavs;
Stanislav Kinsbursky6d59b8d2012-01-10 16:12:54 +0400141 struct net *net;
Chuck Leverc5d120f2008-12-23 15:21:35 -0500142};
143
144extern int nfs_mount(struct nfs_mount_request *info);
Chuck Lever0b524122009-08-09 15:09:30 -0400145extern void nfs_umount(const struct nfs_mount_request *info);
Chuck Lever146ec942008-12-23 15:21:34 -0500146
David Howells24c8dbb2006-08-22 20:06:10 -0400147/* client.c */
Trond Myklebusta613fa12012-01-20 13:53:56 -0500148extern const struct rpc_program nfs_program;
Stanislav Kinsbursky6b131682012-01-23 17:26:05 +0000149extern void nfs_clients_init(struct net *net);
David Howells54ceac42006-08-22 20:06:13 -0400150
Stanislav Kinsbursky28cd1b32012-01-23 17:26:22 +0000151extern void nfs_cleanup_cb_ident_idr(struct net *);
David Howells24c8dbb2006-08-22 20:06:10 -0400152extern void nfs_put_client(struct nfs_client *);
Stanislav Kinsbursky28cd1b32012-01-23 17:26:22 +0000153extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
Andy Adamsonc36fca52011-01-06 02:04:32 +0000154extern struct nfs_client *
Stanislav Kinsburskyc7add9a2012-01-26 15:11:49 +0400155nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
156 struct nfs4_sessionid *);
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -0400157extern struct nfs_server *nfs_create_server(
158 const struct nfs_parsed_mount_data *,
159 struct nfs_fh *);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -0400160extern struct nfs_server *nfs4_create_server(
161 const struct nfs_parsed_mount_data *,
162 struct nfs_fh *);
David Howells54ceac42006-08-22 20:06:13 -0400163extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
164 struct nfs_fh *);
165extern void nfs_free_server(struct nfs_server *server);
166extern struct nfs_server *nfs_clone_server(struct nfs_server *,
167 struct nfs_fh *,
Bryan Schumaker7e6eb682012-04-27 13:27:42 -0400168 struct nfs_fattr *,
169 rpc_authflavor_t);
Andy Adamson76db6d92009-04-01 09:22:38 -0400170extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
Benny Halevy008f55d2009-04-01 09:22:50 -0400171extern int nfs4_check_client_ready(struct nfs_client *clp);
Andy Adamsond83217c2011-03-01 01:34:17 +0000172extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
173 const struct sockaddr *ds_addr,
174 int ds_addrlen, int ds_proto);
David Howells6aaca562006-08-22 20:06:13 -0400175#ifdef CONFIG_PROC_FS
176extern int __init nfs_fs_proc_init(void);
177extern void nfs_fs_proc_exit(void);
178#else
179static inline int nfs_fs_proc_init(void)
180{
181 return 0;
182}
183static inline void nfs_fs_proc_exit(void)
184{
185}
186#endif
David Howells24c8dbb2006-08-22 20:06:10 -0400187
David Howells7d4e2742006-08-22 20:06:07 -0400188/* nfs4namespace.c */
David Howellsf7b422b2006-06-09 09:34:33 -0400189#ifdef CONFIG_NFS_V4
Bryan Schumakerf05d1472012-04-27 13:27:41 -0400190extern struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry);
David Howellsf7b422b2006-06-09 09:34:33 -0400191#else
192static inline
Bryan Schumakerf05d1472012-04-27 13:27:41 -0400193struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry)
David Howellsf7b422b2006-06-09 09:34:33 -0400194{
195 return ERR_PTR(-ENOENT);
196}
197#endif
198
199/* callback_xdr.c */
200extern struct svc_version nfs4_callback_version1;
Alexandros Batsakis07bccc22009-12-05 13:19:01 -0500201extern struct svc_version nfs4_callback_version4;
David Howellsf7b422b2006-06-09 09:34:33 -0400202
203/* pagelist.c */
204extern int __init nfs_init_nfspagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700205extern void nfs_destroy_nfspagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400206extern int __init nfs_init_readpagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700207extern void nfs_destroy_readpagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400208extern int __init nfs_init_writepagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700209extern void nfs_destroy_writepagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400210
David Howellsf7b422b2006-06-09 09:34:33 -0400211extern int __init nfs_init_directcache(void);
David Brownell266bee82006-06-27 12:59:15 -0700212extern void nfs_destroy_directcache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400213
214/* nfs2xdr.c */
Chuck Lever85828492010-12-14 14:55:00 +0000215extern int nfs_stat_to_errno(enum nfs_stat);
David Howellsf7b422b2006-06-09 09:34:33 -0400216extern struct rpc_procinfo nfs_procedures[];
Chuck Lever573c4e12010-12-14 14:58:11 +0000217extern int nfs2_decode_dirent(struct xdr_stream *,
218 struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -0400219
220/* nfs3xdr.c */
221extern struct rpc_procinfo nfs3_procedures[];
Chuck Lever573c4e12010-12-14 14:58:11 +0000222extern int nfs3_decode_dirent(struct xdr_stream *,
223 struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -0400224
225/* nfs4xdr.c */
David Howells7d4e2742006-08-22 20:06:07 -0400226#ifdef CONFIG_NFS_V4
Chuck Lever573c4e12010-12-14 14:58:11 +0000227extern int nfs4_decode_dirent(struct xdr_stream *,
228 struct nfs_entry *, int);
David Howells7d4e2742006-08-22 20:06:07 -0400229#endif
Alexandros Batsakis2449ea22009-12-05 13:36:55 -0500230#ifdef CONFIG_NFS_V4_1
231extern const u32 nfs41_maxread_overhead;
232extern const u32 nfs41_maxwrite_overhead;
233#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400234
235/* nfs4proc.c */
Andrew Mortond75d5412006-06-25 02:41:26 -0700236#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400237extern struct rpc_procinfo nfs4_procedures[];
Andrew Mortond75d5412006-06-25 02:41:26 -0700238#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400239
Andy Adamsond83217c2011-03-01 01:34:17 +0000240extern int nfs4_init_ds_session(struct nfs_client *clp);
241
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400242/* proc.c */
243void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
Andy Adamson45a52a02011-03-01 01:34:08 +0000244extern int nfs_init_client(struct nfs_client *clp,
245 const struct rpc_timeout *timeparms,
246 const char *ip_addr, rpc_authflavor_t authflavour,
247 int noresvport);
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400248
Trond Myklebust979df722006-07-25 11:28:19 -0400249/* dir.c */
Dave Chinner7f8275d2010-07-19 14:56:17 +1000250extern int nfs_access_cache_shrinker(struct shrinker *shrink,
Ying Han1495f232011-05-24 17:12:27 -0700251 struct shrink_control *sc);
Trond Myklebust979df722006-07-25 11:28:19 -0400252
David Howellsf7b422b2006-06-09 09:34:33 -0400253/* inode.c */
Trond Myklebust57460062008-02-19 20:04:22 -0500254extern struct workqueue_struct *nfsiod_workqueue;
David Howellsf7b422b2006-06-09 09:34:33 -0400255extern struct inode *nfs_alloc_inode(struct super_block *sb);
256extern void nfs_destroy_inode(struct inode *);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100257extern int nfs_write_inode(struct inode *, struct writeback_control *);
Al Virob57922d2010-06-07 14:34:48 -0400258extern void nfs_evict_inode(struct inode *);
David Howellsf7b422b2006-06-09 09:34:33 -0400259#ifdef CONFIG_NFS_V4
Al Virob57922d2010-06-07 14:34:48 -0400260extern void nfs4_evict_inode(struct inode *);
David Howellsf7b422b2006-06-09 09:34:33 -0400261#endif
Trond Myklebustf41f7412008-06-11 17:39:04 -0400262void nfs_zap_acl_cache(struct inode *inode);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400263extern int nfs_wait_bit_killable(void *word);
David Howellsf7b422b2006-06-09 09:34:33 -0400264
265/* super.c */
David Howells54ceac42006-08-22 20:06:13 -0400266extern struct file_system_type nfs_xdev_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400267#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -0400268extern struct file_system_type nfs4_xdev_fs_type;
269extern struct file_system_type nfs4_referral_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400270#endif
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200271
David Howellsf7b422b2006-06-09 09:34:33 -0400272extern struct rpc_stat nfs_rpcstat;
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200273
David Howellsf7b422b2006-06-09 09:34:33 -0400274extern int __init register_nfs_fs(void);
275extern void __exit unregister_nfs_fs(void);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400276extern void nfs_sb_active(struct super_block *sb);
277extern void nfs_sb_deactive(struct super_block *sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400278
279/* namespace.c */
Al Virob514f872011-03-16 06:26:11 -0400280extern char *nfs_path(char **p, struct dentry *dentry,
David Howellsf7b422b2006-06-09 09:34:33 -0400281 char *buffer, ssize_t buflen);
David Howells36d43a42011-01-14 18:45:42 +0000282extern struct vfsmount *nfs_d_automount(struct path *path);
Bryan Schumakerfca78d62011-06-02 14:59:07 -0400283#ifdef CONFIG_NFS_V4
284rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
285#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400286
David Howells54ceac42006-08-22 20:06:13 -0400287/* getroot.c */
Al Viro0d5839a2011-03-16 05:27:27 -0400288extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
289 const char *);
David Howells7d4e2742006-08-22 20:06:07 -0400290#ifdef CONFIG_NFS_V4
Al Viro0d5839a2011-03-16 05:27:27 -0400291extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
292 const char *);
David Howells54ceac42006-08-22 20:06:13 -0400293
Trond Myklebust815409d2010-04-16 16:22:46 -0400294extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
David Howells7d4e2742006-08-22 20:06:07 -0400295#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400296
Trond Myklebust493292d2011-07-13 15:58:28 -0400297struct nfs_pageio_descriptor;
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400298/* read.c */
Andy Adamsondc70d7b2011-03-01 01:34:19 +0000299extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
300 const struct rpc_call_ops *call_ops);
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400301extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
Trond Myklebust493292d2011-07-13 15:58:28 -0400302extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
303 struct list_head *head);
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400304
Trond Myklebust62e4a762011-11-10 14:30:37 -0500305extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
306 struct inode *inode);
Trond Myklebust493292d2011-07-13 15:58:28 -0400307extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
308extern void nfs_readdata_release(struct nfs_read_data *rdata);
Trond Myklebuste885de12011-06-10 13:30:23 -0400309
Andy Adamsondef6ed72009-04-01 09:22:26 -0400310/* write.c */
Trond Myklebustdce81292011-07-13 15:59:19 -0400311extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
312 struct list_head *head);
Trond Myklebuste2fecb22012-01-06 08:57:46 -0500313extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
314 struct inode *inode, int ioflags);
Trond Myklebustdce81292011-07-13 15:59:19 -0400315extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
316extern void nfs_writedata_release(struct nfs_write_data *wdata);
Fred Isamane0c2b382011-03-23 13:27:53 +0000317extern void nfs_commit_free(struct nfs_write_data *p);
Fred Isamana69aef12011-03-03 15:13:47 +0000318extern int nfs_initiate_write(struct nfs_write_data *data,
319 struct rpc_clnt *clnt,
320 const struct rpc_call_ops *call_ops,
321 int how);
Andy Adamsondef6ed72009-04-01 09:22:26 -0400322extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
Fred Isamane0c2b382011-03-23 13:27:53 +0000323extern int nfs_initiate_commit(struct nfs_write_data *data,
324 struct rpc_clnt *clnt,
325 const struct rpc_call_ops *call_ops,
326 int how);
327extern void nfs_init_commit(struct nfs_write_data *data,
328 struct list_head *head,
329 struct pnfs_layout_segment *lseg);
330void nfs_retry_commit(struct list_head *page_list,
331 struct pnfs_layout_segment *lseg);
332void nfs_commit_clear_lock(struct nfs_inode *nfsi);
333void nfs_commitdata_release(void *data);
334void nfs_commit_release_pages(struct nfs_write_data *data);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400335void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *head);
336void nfs_request_remove_commit_list(struct nfs_page *req);
Fred Isamane0c2b382011-03-23 13:27:53 +0000337
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400338#ifdef CONFIG_MIGRATION
339extern int nfs_migrate_page(struct address_space *,
Mel Gormana6bc32b2012-01-12 17:19:43 -0800340 struct page *, struct page *, enum migrate_mode);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400341#else
342#define nfs_migrate_page NULL
343#endif
Andy Adamsondef6ed72009-04-01 09:22:26 -0400344
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400345/* nfs4proc.c */
Benny Halevyd20581a2011-05-22 19:52:03 +0300346extern void __nfs4_read_done_cb(struct nfs_read_data *);
Andy Adamsoncbdabc72011-03-01 01:34:20 +0000347extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
Andy Adamson45a52a02011-03-01 01:34:08 +0000348extern int nfs4_init_client(struct nfs_client *clp,
349 const struct rpc_timeout *timeparms,
350 const char *ip_addr,
351 rpc_authflavor_t authflavour,
352 int noresvport);
Fred Isamana69aef12011-03-03 15:13:47 +0000353extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
Bryan Schumaker7c513052011-03-24 17:12:24 +0000354extern int _nfs4_call_sync(struct rpc_clnt *clnt,
355 struct nfs_server *server,
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400356 struct rpc_message *msg,
357 struct nfs4_sequence_args *args,
358 struct nfs4_sequence_res *res,
359 int cache_reply);
Bryan Schumaker7c513052011-03-24 17:12:24 +0000360extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
361 struct nfs_server *server,
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400362 struct rpc_message *msg,
363 struct nfs4_sequence_args *args,
364 struct nfs4_sequence_res *res,
365 int cache_reply);
366
Andy Adamson557134a2009-04-01 09:21:53 -0400367/*
David Howellsf7b422b2006-06-09 09:34:33 -0400368 * Determine the device name as a string
369 */
Al Virob514f872011-03-16 06:26:11 -0400370static inline char *nfs_devname(struct dentry *dentry,
David Howells54ceac42006-08-22 20:06:13 -0400371 char *buffer, ssize_t buflen)
David Howellsf7b422b2006-06-09 09:34:33 -0400372{
Al Virob514f872011-03-16 06:26:11 -0400373 char *dummy;
374 return nfs_path(&dummy, dentry, buffer, buflen);
David Howellsf7b422b2006-06-09 09:34:33 -0400375}
376
377/*
378 * Determine the actual block size (and log2 thereof)
379 */
380static inline
381unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
382{
383 /* make sure blocksize is a power of two */
384 if ((bsize & (bsize - 1)) || nrbitsp) {
385 unsigned char nrbits;
386
387 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
388 ;
389 bsize = 1 << nrbits;
390 if (nrbitsp)
391 *nrbitsp = nrbits;
392 }
393
394 return bsize;
395}
396
397/*
398 * Calculate the number of 512byte blocks used.
399 */
Chuck Lever9eaa67c2007-07-01 12:12:19 -0400400static inline blkcnt_t nfs_calc_block_size(u64 tsize)
David Howellsf7b422b2006-06-09 09:34:33 -0400401{
Chuck Lever9eaa67c2007-07-01 12:12:19 -0400402 blkcnt_t used = (tsize + 511) >> 9;
David Howellsf7b422b2006-06-09 09:34:33 -0400403 return (used > ULONG_MAX) ? ULONG_MAX : used;
404}
405
406/*
407 * Compute and set NFS server blocksize
408 */
409static inline
410unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
411{
412 if (bsize < NFS_MIN_FILE_IO_SIZE)
413 bsize = NFS_DEF_FILE_IO_SIZE;
414 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
415 bsize = NFS_MAX_FILE_IO_SIZE;
416
417 return nfs_block_bits(bsize, nrbitsp);
418}
419
420/*
421 * Determine the maximum file size for a superblock
422 */
423static inline
424void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
425{
426 sb->s_maxbytes = (loff_t)maxfilesize;
427 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
428 sb->s_maxbytes = MAX_LFS_FILESIZE;
429}
Trond Myklebust49a70f22006-12-05 00:35:38 -0500430
431/*
432 * Determine the number of bytes of data the page contains
433 */
434static inline
435unsigned int nfs_page_length(struct page *page)
436{
437 loff_t i_size = i_size_read(page->mapping->host);
438
439 if (i_size > 0) {
440 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
441 if (page->index < end_index)
442 return PAGE_CACHE_SIZE;
443 if (page->index == end_index)
444 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
445 }
446 return 0;
447}
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400448
449/*
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500450 * Convert a umode to a dirent->d_type
451 */
452static inline
453unsigned char nfs_umode_to_dtype(umode_t mode)
454{
455 return (mode >> 12) & 15;
456}
457
458/*
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400459 * Determine the number of pages in an array of length 'len' and
460 * with a base offset of 'base'
461 */
462static inline
463unsigned int nfs_page_array_len(unsigned int base, size_t len)
464{
465 return ((unsigned long)len + (unsigned long)base +
466 PAGE_SIZE - 1) >> PAGE_SHIFT;
467}
Trond Myklebust0110ee12009-12-07 09:00:24 -0500468