blob: ab12913dd473bb1ef1ea27260699fbd4f7d76430 [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;
\"Talpey, Thomas\6b18eaa2007-09-10 13:43:29 -0400126};
127
Chuck Lever146ec942008-12-23 15:21:34 -0500128/* mount_clnt.c */
Chuck Leverc5d120f2008-12-23 15:21:35 -0500129struct nfs_mount_request {
130 struct sockaddr *sap;
131 size_t salen;
132 char *hostname;
133 char *dirpath;
134 u32 version;
135 unsigned short protocol;
136 struct nfs_fh *fh;
Chuck Lever50a737f2008-12-23 15:21:37 -0500137 int noresvport;
Chuck Lever8e02f6b2009-06-17 18:02:13 -0700138 unsigned int *auth_flav_len;
139 rpc_authflavor_t *auth_flavs;
Chuck Leverc5d120f2008-12-23 15:21:35 -0500140};
141
142extern int nfs_mount(struct nfs_mount_request *info);
Chuck Lever0b524122009-08-09 15:09:30 -0400143extern void nfs_umount(const struct nfs_mount_request *info);
Chuck Lever146ec942008-12-23 15:21:34 -0500144
David Howells24c8dbb2006-08-22 20:06:10 -0400145/* client.c */
David Howells54ceac42006-08-22 20:06:13 -0400146extern struct rpc_program nfs_program;
147
Andy Adamsonf4eecd52011-01-06 02:04:30 +0000148extern void nfs_cleanup_cb_ident_idr(void);
David Howells24c8dbb2006-08-22 20:06:10 -0400149extern void nfs_put_client(struct nfs_client *);
Andy Adamsonc36fca52011-01-06 02:04:32 +0000150extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
151extern struct nfs_client *nfs4_find_client_ident(int);
152extern struct nfs_client *
Andy Adamson778be232011-01-25 15:38:01 +0000153nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -0400154extern struct nfs_server *nfs_create_server(
155 const struct nfs_parsed_mount_data *,
156 struct nfs_fh *);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -0400157extern struct nfs_server *nfs4_create_server(
158 const struct nfs_parsed_mount_data *,
159 struct nfs_fh *);
David Howells54ceac42006-08-22 20:06:13 -0400160extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
161 struct nfs_fh *);
162extern void nfs_free_server(struct nfs_server *server);
163extern struct nfs_server *nfs_clone_server(struct nfs_server *,
164 struct nfs_fh *,
165 struct nfs_fattr *);
Andy Adamson76db6d92009-04-01 09:22:38 -0400166extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
Benny Halevy008f55d2009-04-01 09:22:50 -0400167extern int nfs4_check_client_ready(struct nfs_client *clp);
Andy Adamsond83217c2011-03-01 01:34:17 +0000168extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
169 const struct sockaddr *ds_addr,
170 int ds_addrlen, int ds_proto);
David Howells6aaca562006-08-22 20:06:13 -0400171#ifdef CONFIG_PROC_FS
172extern int __init nfs_fs_proc_init(void);
173extern void nfs_fs_proc_exit(void);
174#else
175static inline int nfs_fs_proc_init(void)
176{
177 return 0;
178}
179static inline void nfs_fs_proc_exit(void)
180{
181}
182#endif
David Howells24c8dbb2006-08-22 20:06:10 -0400183
David Howells7d4e2742006-08-22 20:06:07 -0400184/* nfs4namespace.c */
David Howellsf7b422b2006-06-09 09:34:33 -0400185#ifdef CONFIG_NFS_V4
Al Virof8ad9c42011-03-16 06:32:07 -0400186extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
David Howellsf7b422b2006-06-09 09:34:33 -0400187#else
188static inline
Al Virof8ad9c42011-03-16 06:32:07 -0400189struct vfsmount *nfs_do_refmount(struct dentry *dentry)
David Howellsf7b422b2006-06-09 09:34:33 -0400190{
191 return ERR_PTR(-ENOENT);
192}
193#endif
194
195/* callback_xdr.c */
196extern struct svc_version nfs4_callback_version1;
Alexandros Batsakis07bccc22009-12-05 13:19:01 -0500197extern struct svc_version nfs4_callback_version4;
David Howellsf7b422b2006-06-09 09:34:33 -0400198
199/* pagelist.c */
200extern int __init nfs_init_nfspagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700201extern void nfs_destroy_nfspagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400202extern int __init nfs_init_readpagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700203extern void nfs_destroy_readpagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400204extern int __init nfs_init_writepagecache(void);
David Brownell266bee82006-06-27 12:59:15 -0700205extern void nfs_destroy_writepagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400206
David Howellsf7b422b2006-06-09 09:34:33 -0400207extern int __init nfs_init_directcache(void);
David Brownell266bee82006-06-27 12:59:15 -0700208extern void nfs_destroy_directcache(void);
David Howellsf7b422b2006-06-09 09:34:33 -0400209
210/* nfs2xdr.c */
Chuck Lever85828492010-12-14 14:55:00 +0000211extern int nfs_stat_to_errno(enum nfs_stat);
David Howellsf7b422b2006-06-09 09:34:33 -0400212extern struct rpc_procinfo nfs_procedures[];
Chuck Lever573c4e12010-12-14 14:58:11 +0000213extern int nfs2_decode_dirent(struct xdr_stream *,
214 struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -0400215
216/* nfs3xdr.c */
217extern struct rpc_procinfo nfs3_procedures[];
Chuck Lever573c4e12010-12-14 14:58:11 +0000218extern int nfs3_decode_dirent(struct xdr_stream *,
219 struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -0400220
221/* nfs4xdr.c */
David Howells7d4e2742006-08-22 20:06:07 -0400222#ifdef CONFIG_NFS_V4
Chuck Lever573c4e12010-12-14 14:58:11 +0000223extern int nfs4_decode_dirent(struct xdr_stream *,
224 struct nfs_entry *, int);
David Howells7d4e2742006-08-22 20:06:07 -0400225#endif
Alexandros Batsakis2449ea22009-12-05 13:36:55 -0500226#ifdef CONFIG_NFS_V4_1
227extern const u32 nfs41_maxread_overhead;
228extern const u32 nfs41_maxwrite_overhead;
229#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400230
231/* nfs4proc.c */
Andrew Mortond75d5412006-06-25 02:41:26 -0700232#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400233extern struct rpc_procinfo nfs4_procedures[];
Bryan Schumaker7ebb9312011-03-24 17:12:30 +0000234void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
Andrew Mortond75d5412006-06-25 02:41:26 -0700235#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400236
Andy Adamsond83217c2011-03-01 01:34:17 +0000237extern int nfs4_init_ds_session(struct nfs_client *clp);
238
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400239/* proc.c */
240void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
Andy Adamson45a52a02011-03-01 01:34:08 +0000241extern int nfs_init_client(struct nfs_client *clp,
242 const struct rpc_timeout *timeparms,
243 const char *ip_addr, rpc_authflavor_t authflavour,
244 int noresvport);
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400245
Trond Myklebust979df722006-07-25 11:28:19 -0400246/* dir.c */
Dave Chinner7f8275d2010-07-19 14:56:17 +1000247extern int nfs_access_cache_shrinker(struct shrinker *shrink,
Ying Han1495f232011-05-24 17:12:27 -0700248 struct shrink_control *sc);
Trond Myklebust979df722006-07-25 11:28:19 -0400249
David Howellsf7b422b2006-06-09 09:34:33 -0400250/* inode.c */
Trond Myklebust57460062008-02-19 20:04:22 -0500251extern struct workqueue_struct *nfsiod_workqueue;
David Howellsf7b422b2006-06-09 09:34:33 -0400252extern struct inode *nfs_alloc_inode(struct super_block *sb);
253extern void nfs_destroy_inode(struct inode *);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100254extern int nfs_write_inode(struct inode *, struct writeback_control *);
Al Virob57922d2010-06-07 14:34:48 -0400255extern void nfs_evict_inode(struct inode *);
David Howellsf7b422b2006-06-09 09:34:33 -0400256#ifdef CONFIG_NFS_V4
Al Virob57922d2010-06-07 14:34:48 -0400257extern void nfs4_evict_inode(struct inode *);
David Howellsf7b422b2006-06-09 09:34:33 -0400258#endif
Trond Myklebustf41f7412008-06-11 17:39:04 -0400259void nfs_zap_acl_cache(struct inode *inode);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400260extern int nfs_wait_bit_killable(void *word);
David Howellsf7b422b2006-06-09 09:34:33 -0400261
262/* super.c */
David Howells54ceac42006-08-22 20:06:13 -0400263extern struct file_system_type nfs_xdev_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400264#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -0400265extern struct file_system_type nfs4_xdev_fs_type;
266extern struct file_system_type nfs4_referral_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400267#endif
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200268
David Howellsf7b422b2006-06-09 09:34:33 -0400269extern struct rpc_stat nfs_rpcstat;
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200270
David Howellsf7b422b2006-06-09 09:34:33 -0400271extern int __init register_nfs_fs(void);
272extern void __exit unregister_nfs_fs(void);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400273extern void nfs_sb_active(struct super_block *sb);
274extern void nfs_sb_deactive(struct super_block *sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400275
276/* namespace.c */
Al Virob514f872011-03-16 06:26:11 -0400277extern char *nfs_path(char **p, struct dentry *dentry,
David Howellsf7b422b2006-06-09 09:34:33 -0400278 char *buffer, ssize_t buflen);
David Howells36d43a42011-01-14 18:45:42 +0000279extern struct vfsmount *nfs_d_automount(struct path *path);
Bryan Schumakerfca78d62011-06-02 14:59:07 -0400280#ifdef CONFIG_NFS_V4
281rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
282#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400283
David Howells54ceac42006-08-22 20:06:13 -0400284/* getroot.c */
Al Viro0d5839a2011-03-16 05:27:27 -0400285extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
286 const char *);
David Howells7d4e2742006-08-22 20:06:07 -0400287#ifdef CONFIG_NFS_V4
Al Viro0d5839a2011-03-16 05:27:27 -0400288extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
289 const char *);
David Howells54ceac42006-08-22 20:06:13 -0400290
Trond Myklebust815409d2010-04-16 16:22:46 -0400291extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
David Howells7d4e2742006-08-22 20:06:07 -0400292#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400293
Trond Myklebust493292d2011-07-13 15:58:28 -0400294struct nfs_pageio_descriptor;
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400295/* read.c */
Andy Adamsondc70d7b2011-03-01 01:34:19 +0000296extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
297 const struct rpc_call_ops *call_ops);
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400298extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
Trond Myklebust493292d2011-07-13 15:58:28 -0400299extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
300 struct list_head *head);
Andy Adamsonf11c88a2009-04-01 09:22:25 -0400301
Trond Myklebust493292d2011-07-13 15:58:28 -0400302extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
303extern void nfs_readdata_release(struct nfs_read_data *rdata);
Trond Myklebuste885de12011-06-10 13:30:23 -0400304
Andy Adamsondef6ed72009-04-01 09:22:26 -0400305/* write.c */
Trond Myklebustdce81292011-07-13 15:59:19 -0400306extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
307 struct list_head *head);
Trond Myklebustdce81292011-07-13 15:59:19 -0400308extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
309extern void nfs_writedata_release(struct nfs_write_data *wdata);
Fred Isamane0c2b382011-03-23 13:27:53 +0000310extern void nfs_commit_free(struct nfs_write_data *p);
Fred Isamana69aef12011-03-03 15:13:47 +0000311extern int nfs_initiate_write(struct nfs_write_data *data,
312 struct rpc_clnt *clnt,
313 const struct rpc_call_ops *call_ops,
314 int how);
Andy Adamsondef6ed72009-04-01 09:22:26 -0400315extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
Fred Isamane0c2b382011-03-23 13:27:53 +0000316extern int nfs_initiate_commit(struct nfs_write_data *data,
317 struct rpc_clnt *clnt,
318 const struct rpc_call_ops *call_ops,
319 int how);
320extern void nfs_init_commit(struct nfs_write_data *data,
321 struct list_head *head,
322 struct pnfs_layout_segment *lseg);
323void nfs_retry_commit(struct list_head *page_list,
324 struct pnfs_layout_segment *lseg);
325void nfs_commit_clear_lock(struct nfs_inode *nfsi);
326void nfs_commitdata_release(void *data);
327void nfs_commit_release_pages(struct nfs_write_data *data);
328
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400329#ifdef CONFIG_MIGRATION
330extern int nfs_migrate_page(struct address_space *,
331 struct page *, struct page *);
332#else
333#define nfs_migrate_page NULL
334#endif
Andy Adamsondef6ed72009-04-01 09:22:26 -0400335
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400336/* nfs4proc.c */
Benny Halevyd20581a2011-05-22 19:52:03 +0300337extern void __nfs4_read_done_cb(struct nfs_read_data *);
Andy Adamsoncbdabc7f2011-03-01 01:34:20 +0000338extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
Andy Adamson45a52a02011-03-01 01:34:08 +0000339extern int nfs4_init_client(struct nfs_client *clp,
340 const struct rpc_timeout *timeparms,
341 const char *ip_addr,
342 rpc_authflavor_t authflavour,
343 int noresvport);
Fred Isamana69aef12011-03-03 15:13:47 +0000344extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
Bryan Schumaker7c513052011-03-24 17:12:24 +0000345extern int _nfs4_call_sync(struct rpc_clnt *clnt,
346 struct nfs_server *server,
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400347 struct rpc_message *msg,
348 struct nfs4_sequence_args *args,
349 struct nfs4_sequence_res *res,
350 int cache_reply);
Bryan Schumaker7c513052011-03-24 17:12:24 +0000351extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
352 struct nfs_server *server,
Andy Adamsoncccef3b2009-04-01 09:22:03 -0400353 struct rpc_message *msg,
354 struct nfs4_sequence_args *args,
355 struct nfs4_sequence_res *res,
356 int cache_reply);
357
Andy Adamson557134a2009-04-01 09:21:53 -0400358/*
David Howellsf7b422b2006-06-09 09:34:33 -0400359 * Determine the device name as a string
360 */
Al Virob514f872011-03-16 06:26:11 -0400361static inline char *nfs_devname(struct dentry *dentry,
David Howells54ceac42006-08-22 20:06:13 -0400362 char *buffer, ssize_t buflen)
David Howellsf7b422b2006-06-09 09:34:33 -0400363{
Al Virob514f872011-03-16 06:26:11 -0400364 char *dummy;
365 return nfs_path(&dummy, dentry, buffer, buflen);
David Howellsf7b422b2006-06-09 09:34:33 -0400366}
367
368/*
369 * Determine the actual block size (and log2 thereof)
370 */
371static inline
372unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
373{
374 /* make sure blocksize is a power of two */
375 if ((bsize & (bsize - 1)) || nrbitsp) {
376 unsigned char nrbits;
377
378 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
379 ;
380 bsize = 1 << nrbits;
381 if (nrbitsp)
382 *nrbitsp = nrbits;
383 }
384
385 return bsize;
386}
387
388/*
389 * Calculate the number of 512byte blocks used.
390 */
Chuck Lever9eaa67c2007-07-01 12:12:19 -0400391static inline blkcnt_t nfs_calc_block_size(u64 tsize)
David Howellsf7b422b2006-06-09 09:34:33 -0400392{
Chuck Lever9eaa67c2007-07-01 12:12:19 -0400393 blkcnt_t used = (tsize + 511) >> 9;
David Howellsf7b422b2006-06-09 09:34:33 -0400394 return (used > ULONG_MAX) ? ULONG_MAX : used;
395}
396
397/*
398 * Compute and set NFS server blocksize
399 */
400static inline
401unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
402{
403 if (bsize < NFS_MIN_FILE_IO_SIZE)
404 bsize = NFS_DEF_FILE_IO_SIZE;
405 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
406 bsize = NFS_MAX_FILE_IO_SIZE;
407
408 return nfs_block_bits(bsize, nrbitsp);
409}
410
411/*
412 * Determine the maximum file size for a superblock
413 */
414static inline
415void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
416{
417 sb->s_maxbytes = (loff_t)maxfilesize;
418 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
419 sb->s_maxbytes = MAX_LFS_FILESIZE;
420}
Trond Myklebust49a70f22006-12-05 00:35:38 -0500421
422/*
423 * Determine the number of bytes of data the page contains
424 */
425static inline
426unsigned int nfs_page_length(struct page *page)
427{
428 loff_t i_size = i_size_read(page->mapping->host);
429
430 if (i_size > 0) {
431 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
432 if (page->index < end_index)
433 return PAGE_CACHE_SIZE;
434 if (page->index == end_index)
435 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
436 }
437 return 0;
438}
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400439
440/*
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500441 * Convert a umode to a dirent->d_type
442 */
443static inline
444unsigned char nfs_umode_to_dtype(umode_t mode)
445{
446 return (mode >> 12) & 15;
447}
448
449/*
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400450 * Determine the number of pages in an array of length 'len' and
451 * with a base offset of 'base'
452 */
453static inline
454unsigned int nfs_page_array_len(unsigned int base, size_t len)
455{
456 return ((unsigned long)len + (unsigned long)base +
457 PAGE_SIZE - 1) >> PAGE_SHIFT;
458}
Trond Myklebust0110ee12009-12-07 09:00:24 -0500459
460/*
461 * Helper for restarting RPC calls in the possible presence of NFSv4.1
462 * sessions.
463 */
Trond Myklebustd05dd4e2010-07-31 14:29:07 -0400464static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
Trond Myklebust0110ee12009-12-07 09:00:24 -0500465{
466 if (nfs4_has_session(clp))
Trond Myklebustd05dd4e2010-07-31 14:29:07 -0400467 return rpc_restart_call_prepare(task);
468 return rpc_restart_call(task);
Trond Myklebust0110ee12009-12-07 09:00:24 -0500469}