nfs41: only state manager sets NFS4CLNT_SESSION_SETUP
[deliverable/linux.git] / fs / nfs / internal.h
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f7b422b1
DH
1/*
2 * NFS internal definitions
3 */
4
eedc020e 5#include "nfs4_fs.h"
f7b422b1 6#include <linux/mount.h>
f9c3a380 7#include <linux/security.h>
f7b422b1 8
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DH
9#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
10
54ceac45 11struct nfs_string;
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DH
12
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
eedc020e
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21/*
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
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33struct nfs_clone_mount {
34 const struct super_block *sb;
35 const struct dentry *dentry;
36 struct nfs_fh *fh;
37 struct nfs_fattr *fattr;
38 char *hostname;
39 char *mnt_path;
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40 struct sockaddr *addr;
41 size_t addrlen;
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42 rpc_authflavor_t authflavor;
43};
44
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45/*
46 * Note: RFC 1813 doesn't limit the number of auth flavors that
47 * a server can return, so make something up.
48 */
49#define NFS_MAX_SECFLAVORS (12)
50
4cfd74fc
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51/*
52 * Value used if the user did not specify a port value.
53 */
54#define NFS_UNSPEC_PORT (-1)
55
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56/*
57 * In-kernel mount arguments
58 */
59struct nfs_parsed_mount_data {
60 int flags;
61 int rsize, wsize;
62 int timeo, retrans;
63 int acregmin, acregmax,
64 acdirmin, acdirmax;
65 int namlen;
b797cac7 66 unsigned int options;
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67 unsigned int bsize;
68 unsigned int auth_flavor_len;
69 rpc_authflavor_t auth_flavors[1];
70 char *client_address;
764302cc 71 unsigned int version;
3fd5be9e 72 unsigned int minorversion;
08734048 73 char *fscache_uniq;
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74
75 struct {
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76 struct sockaddr_storage address;
77 size_t addrlen;
6b18eaa0 78 char *hostname;
78fa701f 79 u32 version;
4cfd74fc 80 int port;
78fa701f 81 unsigned short protocol;
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82 } mount_server;
83
84 struct {
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85 struct sockaddr_storage address;
86 size_t addrlen;
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87 char *hostname;
88 char *export_path;
4cfd74fc 89 int port;
78fa701f 90 unsigned short protocol;
6b18eaa0 91 } nfs_server;
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92
93 struct security_mnt_opts lsm_opts;
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94};
95
146ec944 96/* mount_clnt.c */
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97struct nfs_mount_request {
98 struct sockaddr *sap;
99 size_t salen;
100 char *hostname;
101 char *dirpath;
102 u32 version;
103 unsigned short protocol;
104 struct nfs_fh *fh;
50a737f8 105 int noresvport;
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106 unsigned int *auth_flav_len;
107 rpc_authflavor_t *auth_flavs;
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108};
109
110extern int nfs_mount(struct nfs_mount_request *info);
0b524123 111extern void nfs_umount(const struct nfs_mount_request *info);
146ec944 112
24c8dbbb 113/* client.c */
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114extern struct rpc_program nfs_program;
115
24c8dbbb 116extern void nfs_put_client(struct nfs_client *);
ff052645 117extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
3fbd67ad 118extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
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119extern struct nfs_server *nfs_create_server(
120 const struct nfs_parsed_mount_data *,
121 struct nfs_fh *);
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122extern struct nfs_server *nfs4_create_server(
123 const struct nfs_parsed_mount_data *,
124 struct nfs_fh *);
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125extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
126 struct nfs_fh *);
127extern void nfs_free_server(struct nfs_server *server);
128extern struct nfs_server *nfs_clone_server(struct nfs_server *,
129 struct nfs_fh *,
130 struct nfs_fattr *);
76db6d95 131extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
008f55d0 132extern int nfs4_check_client_ready(struct nfs_client *clp);
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133#ifdef CONFIG_PROC_FS
134extern int __init nfs_fs_proc_init(void);
135extern void nfs_fs_proc_exit(void);
136#else
137static inline int nfs_fs_proc_init(void)
138{
139 return 0;
140}
141static inline void nfs_fs_proc_exit(void)
142{
143}
144#endif
24c8dbbb 145
7d4e2747 146/* nfs4namespace.c */
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147#ifdef CONFIG_NFS_V4
148extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
149#else
150static inline
151struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
152{
153 return ERR_PTR(-ENOENT);
154}
155#endif
156
157/* callback_xdr.c */
158extern struct svc_version nfs4_callback_version1;
159
160/* pagelist.c */
161extern int __init nfs_init_nfspagecache(void);
266bee88 162extern void nfs_destroy_nfspagecache(void);
f7b422b1 163extern int __init nfs_init_readpagecache(void);
266bee88 164extern void nfs_destroy_readpagecache(void);
f7b422b1 165extern int __init nfs_init_writepagecache(void);
266bee88 166extern void nfs_destroy_writepagecache(void);
f7b422b1 167
f7b422b1 168extern int __init nfs_init_directcache(void);
266bee88 169extern void nfs_destroy_directcache(void);
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170
171/* nfs2xdr.c */
7d4e2747 172extern int nfs_stat_to_errno(int);
f7b422b1 173extern struct rpc_procinfo nfs_procedures[];
0dbb4c67 174extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
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175
176/* nfs3xdr.c */
177extern struct rpc_procinfo nfs3_procedures[];
0dbb4c67 178extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
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179
180/* nfs4xdr.c */
7d4e2747 181#ifdef CONFIG_NFS_V4
0dbb4c67 182extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
7d4e2747 183#endif
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184
185/* nfs4proc.c */
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186extern void nfs4_restart_rpc(struct rpc_task *, const struct nfs_client *,
187 struct nfs4_sequence_res *);
d75d5414 188#ifdef CONFIG_NFS_V4
f7b422b1 189extern struct rpc_procinfo nfs4_procedures[];
d75d5414 190#endif
f7b422b1 191
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192/* proc.c */
193void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
194
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195/* dir.c */
196extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
197
f7b422b1 198/* inode.c */
5746006f 199extern struct workqueue_struct *nfsiod_workqueue;
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200extern struct inode *nfs_alloc_inode(struct super_block *sb);
201extern void nfs_destroy_inode(struct inode *);
202extern int nfs_write_inode(struct inode *,int);
203extern void nfs_clear_inode(struct inode *);
204#ifdef CONFIG_NFS_V4
205extern void nfs4_clear_inode(struct inode *);
206#endif
f41f7418 207void nfs_zap_acl_cache(struct inode *inode);
72cb77f4 208extern int nfs_wait_bit_killable(void *word);
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209
210/* super.c */
54ceac45 211extern struct file_system_type nfs_xdev_fs_type;
f7b422b1 212#ifdef CONFIG_NFS_V4
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213extern struct file_system_type nfs4_xdev_fs_type;
214extern struct file_system_type nfs4_referral_fs_type;
f7b422b1 215#endif
4ebd9ab3 216
f7b422b1 217extern struct rpc_stat nfs_rpcstat;
4ebd9ab3 218
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219extern int __init register_nfs_fs(void);
220extern void __exit unregister_nfs_fs(void);
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221extern void nfs_sb_active(struct super_block *sb);
222extern void nfs_sb_deactive(struct super_block *sb);
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223
224/* namespace.c */
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225extern char *nfs_path(const char *base,
226 const struct dentry *droot,
227 const struct dentry *dentry,
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228 char *buffer, ssize_t buflen);
229
54ceac45
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230/* getroot.c */
231extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
7d4e2747 232#ifdef CONFIG_NFS_V4
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233extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
234
235extern int nfs4_path_walk(struct nfs_server *server,
236 struct nfs_fh *mntfh,
237 const char *path);
7d4e2747 238#endif
f7b422b1 239
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240/* read.c */
241extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
242
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243/* write.c */
244extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
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245#ifdef CONFIG_MIGRATION
246extern int nfs_migrate_page(struct address_space *,
247 struct page *, struct page *);
248#else
249#define nfs_migrate_page NULL
250#endif
def6ed7e 251
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252/* nfs4proc.c */
253extern int _nfs4_call_sync(struct nfs_server *server,
254 struct rpc_message *msg,
255 struct nfs4_sequence_args *args,
256 struct nfs4_sequence_res *res,
257 int cache_reply);
258extern int _nfs4_call_sync_session(struct nfs_server *server,
259 struct rpc_message *msg,
260 struct nfs4_sequence_args *args,
261 struct nfs4_sequence_res *res,
262 int cache_reply);
263
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264#ifdef CONFIG_NFS_V4_1
265extern void nfs41_sequence_free_slot(const struct nfs_client *,
266 struct nfs4_sequence_res *res);
267#endif /* CONFIG_NFS_V4_1 */
268
269static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
270 struct nfs4_sequence_res *res)
271{
272#ifdef CONFIG_NFS_V4_1
273 if (nfs4_has_session(clp))
274 nfs41_sequence_free_slot(clp, res);
275#endif /* CONFIG_NFS_V4_1 */
276}
277
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278/*
279 * Determine the device name as a string
280 */
281static inline char *nfs_devname(const struct vfsmount *mnt_parent,
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282 const struct dentry *dentry,
283 char *buffer, ssize_t buflen)
f7b422b1 284{
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285 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
286 dentry, buffer, buflen);
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287}
288
289/*
290 * Determine the actual block size (and log2 thereof)
291 */
292static inline
293unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
294{
295 /* make sure blocksize is a power of two */
296 if ((bsize & (bsize - 1)) || nrbitsp) {
297 unsigned char nrbits;
298
299 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
300 ;
301 bsize = 1 << nrbits;
302 if (nrbitsp)
303 *nrbitsp = nrbits;
304 }
305
306 return bsize;
307}
308
309/*
310 * Calculate the number of 512byte blocks used.
311 */
9eaa67c6 312static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1 313{
9eaa67c6 314 blkcnt_t used = (tsize + 511) >> 9;
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DH
315 return (used > ULONG_MAX) ? ULONG_MAX : used;
316}
317
318/*
319 * Compute and set NFS server blocksize
320 */
321static inline
322unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
323{
324 if (bsize < NFS_MIN_FILE_IO_SIZE)
325 bsize = NFS_DEF_FILE_IO_SIZE;
326 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
327 bsize = NFS_MAX_FILE_IO_SIZE;
328
329 return nfs_block_bits(bsize, nrbitsp);
330}
331
332/*
333 * Determine the maximum file size for a superblock
334 */
335static inline
336void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
337{
338 sb->s_maxbytes = (loff_t)maxfilesize;
339 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
340 sb->s_maxbytes = MAX_LFS_FILESIZE;
341}
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342
343/*
344 * Determine the number of bytes of data the page contains
345 */
346static inline
347unsigned int nfs_page_length(struct page *page)
348{
349 loff_t i_size = i_size_read(page->mapping->host);
350
351 if (i_size > 0) {
352 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
353 if (page->index < end_index)
354 return PAGE_CACHE_SIZE;
355 if (page->index == end_index)
356 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
357 }
358 return 0;
359}
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360
361/*
362 * Determine the number of pages in an array of length 'len' and
363 * with a base offset of 'base'
364 */
365static inline
366unsigned int nfs_page_array_len(unsigned int base, size_t len)
367{
368 return ((unsigned long)len + (unsigned long)base +
369 PAGE_SIZE - 1) >> PAGE_SHIFT;
370}
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