1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
|
/*
* linux/include/linux/nfs_fs.h
*
* Copyright (C) 1992 Rick Sladkey
*
* OS-specific nfs filesystem definitions and declarations
*/
#ifndef _LINUX_NFS_FS_H
#define _LINUX_NFS_FS_H
#include <linux/config.h>
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs_xdr.h>
/*
* Enable debugging support for nfs client.
* Requires RPC_DEBUG.
*/
#ifdef RPC_DEBUG
# define NFS_DEBUG
#endif
/*
* NFS_MAX_DIRCACHE controls the number of simultaneously cached
* directory chunks. Each chunk holds the list of nfs_entry's returned
* in a single readdir call in a memory region of size PAGE_SIZE.
*
* Note that at most server->rsize bytes of the cache memory are used.
*/
#define NFS_MAX_DIRCACHE 16
#define NFS_MAX_FILE_IO_BUFFER_SIZE 32768
#define NFS_DEF_FILE_IO_BUFFER_SIZE 4096
/*
* The upper limit on timeouts for the exponential backoff algorithm.
*/
#define NFS_MAX_RPC_TIMEOUT (6*HZ)
#define NFS_READ_DELAY (2*HZ)
#define NFS_WRITEBACK_DELAY (5*HZ)
#define NFS_WRITEBACK_LOCKDELAY (60*HZ)
#define NFS_COMMIT_DELAY (5*HZ)
/*
* Size of the lookup cache in units of number of entries cached.
* It is better not to make this too large although the optimum
* depends on a usage and environment.
*/
#define NFS_LOOKUP_CACHE_SIZE 64
/*
* superblock magic number for NFS
*/
#define NFS_SUPER_MAGIC 0x6969
static inline struct nfs_inode_info *NFS_I(struct inode *inode)
{
return &inode->u.nfs_i;
}
#define NFS_FH(inode) (&(inode)->u.nfs_i.fh)
#define NFS_SERVER(inode) (&(inode)->i_sb->u.nfs_sb.s_server)
#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
#define NFS_REQUESTLIST(inode) (NFS_SERVER(inode)->rw_requests)
#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
#define NFS_CONGESTED(inode) (RPC_CONGESTED(NFS_CLIENT(inode)))
#define NFS_COOKIEVERF(inode) ((inode)->u.nfs_i.cookieverf)
#define NFS_READTIME(inode) ((inode)->u.nfs_i.read_cache_jiffies)
#define NFS_MTIME_UPDATE(inode) ((inode)->u.nfs_i.cache_mtime_jiffies)
#define NFS_CACHE_CTIME(inode) ((inode)->u.nfs_i.read_cache_ctime)
#define NFS_CACHE_MTIME(inode) ((inode)->u.nfs_i.read_cache_mtime)
#define NFS_CACHE_ISIZE(inode) ((inode)->u.nfs_i.read_cache_isize)
#define NFS_NEXTSCAN(inode) ((inode)->u.nfs_i.nextscan)
#define NFS_CACHEINV(inode) \
do { \
NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \
} while (0)
#define NFS_ATTRTIMEO(inode) ((inode)->u.nfs_i.attrtimeo)
#define NFS_MINATTRTIMEO(inode) \
(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
: NFS_SERVER(inode)->acregmin)
#define NFS_MAXATTRTIMEO(inode) \
(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
: NFS_SERVER(inode)->acregmax)
#define NFS_ATTRTIMEO_UPDATE(inode) ((inode)->u.nfs_i.attrtimeo_timestamp)
#define NFS_FLAGS(inode) ((inode)->u.nfs_i.flags)
#define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
#define NFS_STALE(inode) (NFS_FLAGS(inode) & NFS_INO_STALE)
#define NFS_FILEID(inode) ((inode)->u.nfs_i.fileid)
/* Inode Flags */
#define NFS_USE_READDIRPLUS(inode) ((NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS) ? 1 : 0)
/*
* These are the default flags for swap requests
*/
#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
/* Flags in the RPC client structure */
#define NFS_CLNTF_BUFSIZE 0x0001 /* readdir buffer in longwords */
#define NFS_RW_SYNC 0x0001 /* O_SYNC handling */
#define NFS_RW_SWAP 0x0002 /* This is a swap request */
/*
* When flushing a cluster of dirty pages, there can be different
* strategies:
*/
#define FLUSH_AGING 0 /* only flush old buffers */
#define FLUSH_SYNC 1 /* file being synced, or contention */
#define FLUSH_WAIT 2 /* wait for completion */
#define FLUSH_STABLE 4 /* commit to stable storage */
static inline
loff_t page_offset(struct page *page)
{
return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
}
static inline
unsigned long page_index(struct page *page)
{
return page->index;
}
#ifdef __KERNEL__
/*
* linux/fs/nfs/inode.c
*/
extern struct super_block *nfs_read_super(struct super_block *, void *, int);
extern void nfs_zap_caches(struct inode *);
extern int nfs_inode_is_stale(struct inode *, struct nfs_fh *,
struct nfs_fattr *);
extern struct inode *nfs_fhget(struct dentry *, struct nfs_fh *,
struct nfs_fattr *);
extern int __nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_revalidate(struct dentry *);
extern int nfs_permission(struct inode *, int);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern int nfs_check_stale(struct inode *);
extern int nfs_notify_change(struct dentry *, struct iattr *);
/*
* linux/fs/nfs/file.c
*/
extern struct inode_operations nfs_file_inode_operations;
extern struct file_operations nfs_file_operations;
extern struct address_space_operations nfs_file_aops;
static __inline__ struct rpc_cred *
nfs_file_cred(struct file *file)
{
struct rpc_cred *cred = NULL;
if (file)
cred = (struct rpc_cred *)file->private_data;
#ifdef RPC_DEBUG
if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC)
out_of_line_bug();
#endif
return cred;
}
/*
* linux/fs/nfs/dir.c
*/
extern struct inode_operations nfs_dir_inode_operations;
extern struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;
/*
* linux/fs/nfs/symlink.c
*/
extern struct inode_operations nfs_symlink_inode_operations;
/*
* linux/fs/nfs/locks.c
*/
extern int nfs_lock(struct file *, int, struct file_lock *);
/*
* linux/fs/nfs/unlink.c
*/
extern int nfs_async_unlink(struct dentry *);
extern void nfs_complete_unlink(struct dentry *);
/*
* linux/fs/nfs/write.c
*/
extern int nfs_writepage(struct page *);
extern int nfs_flush_incompatible(struct file *file, struct page *page);
extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
/*
* Try to write back everything synchronously (but check the
* return value!)
*/
extern int nfs_sync_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_flush_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_flush_list(struct list_head *, int, int);
extern int nfs_scan_lru_dirty(struct nfs_server *, struct list_head *);
extern int nfs_scan_lru_dirty_timeout(struct nfs_server *, struct list_head *);
#ifdef CONFIG_NFS_V3
extern int nfs_commit_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_commit_list(struct list_head *, int);
extern int nfs_scan_lru_commit(struct nfs_server *, struct list_head *);
extern int nfs_scan_lru_commit_timeout(struct nfs_server *, struct list_head *);
#endif
static inline int
nfs_have_read(struct inode *inode)
{
return !list_empty(&inode->u.nfs_i.read);
}
static inline int
nfs_have_writebacks(struct inode *inode)
{
return !list_empty(&inode->u.nfs_i.writeback);
}
static inline int
nfs_wb_all(struct inode *inode)
{
int error = nfs_sync_file(inode, 0, 0, 0, FLUSH_WAIT);
return (error < 0) ? error : 0;
}
/*
* Write back all requests on one page - we do this before reading it.
*/
static inline int
nfs_wb_page(struct inode *inode, struct page* page)
{
int error = nfs_sync_file(inode, 0, page_index(page), 1, FLUSH_WAIT | FLUSH_STABLE);
return (error < 0) ? error : 0;
}
/*
* Write back all pending writes for one user..
*/
static inline int
nfs_wb_file(struct inode *inode, struct file *file)
{
int error = nfs_sync_file(inode, file, 0, 0, FLUSH_WAIT);
return (error < 0) ? error : 0;
}
/*
* linux/fs/nfs/read.c
*/
extern int nfs_readpage(struct file *, struct page *);
extern int nfs_pagein_inode(struct inode *, unsigned long, unsigned int);
extern int nfs_pagein_list(struct list_head *, int);
extern int nfs_scan_lru_read(struct nfs_server *, struct list_head *);
extern int nfs_scan_lru_read_timeout(struct nfs_server *, struct list_head *);
/*
* linux/fs/mount_clnt.c
* (Used only by nfsroot module)
*/
extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
int, int);
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern u32 root_nfs_parse_addr(char *name); /*__init*/
/*
* inline functions
*/
static inline int
nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
return NFS_STALE(inode) ? -ESTALE : 0;
return __nfs_revalidate_inode(server, inode);
}
static inline int
nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
return __nfs_refresh_inode(inode,fattr);
}
static inline loff_t
nfs_size_to_loff_t(__u64 size)
{
loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
if (size > maxsz)
return maxsz;
return (loff_t) size;
}
static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)
{
ino_t ino = (ino_t) fileid;
if (sizeof(ino_t) < sizeof(u64))
ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
return ino;
}
static inline time_t
nfs_time_to_secs(__u64 time)
{
return (time_t)(time >> 32);
}
/* NFS root */
extern void * nfs_root_data(void);
#define nfs_wait_event(clnt, wq, condition) \
({ \
int __retval = 0; \
if (clnt->cl_intr) { \
sigset_t oldmask; \
rpc_clnt_sigmask(clnt, &oldmask); \
__retval = wait_event_interruptible(wq, condition); \
rpc_clnt_sigunmask(clnt, &oldmask); \
} else \
wait_event(wq, condition); \
__retval; \
})
#ifdef CONFIG_NFS_V3
#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
static inline int
nfs_async_handle_jukebox(struct rpc_task *task)
{
if (task->tk_status != -EJUKEBOX)
return 0;
task->tk_status = 0;
rpc_restart_call(task);
rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
return 1;
}
#else
static inline int
nfs_async_handle_jukebox(struct rpc_task *task)
{
return 0;
}
#endif /* CONFIG_NFS_V3 */
#endif /* __KERNEL__ */
/*
* NFS debug flags
*/
#define NFSDBG_VFS 0x0001
#define NFSDBG_DIRCACHE 0x0002
#define NFSDBG_LOOKUPCACHE 0x0004
#define NFSDBG_PAGECACHE 0x0008
#define NFSDBG_PROC 0x0010
#define NFSDBG_XDR 0x0020
#define NFSDBG_FILE 0x0040
#define NFSDBG_ROOT 0x0080
#define NFSDBG_ALL 0xFFFF
#ifdef __KERNEL__
# undef ifdebug
# ifdef NFS_DEBUG
# define ifdebug(fac) if (nfs_debug & NFSDBG_##fac)
# else
# define ifdebug(fac) if (0)
# endif
#endif /* __KERNEL */
#endif
|
