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1 | /* |
2 | * NFS internal definitions |
3 | */ |
4 | |
5 | #include "nfs4_fs.h" |
6 | #include <linux/mount.h> |
7 | #include <linux/security.h> |
8 | |
9 | #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) |
10 | |
11 | struct nfs_string; |
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 | |
21 | /* |
22 | * Determine if sessions are in use. |
23 | */ |
24 | static 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 | |
33 | struct 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; |
40 | struct sockaddr *addr; |
41 | size_t addrlen; |
42 | rpc_authflavor_t authflavor; |
43 | }; |
44 | |
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 | |
51 | /* |
52 | * In-kernel mount arguments |
53 | */ |
54 | struct nfs_parsed_mount_data { |
55 | int flags; |
56 | int rsize, wsize; |
57 | int timeo, retrans; |
58 | int acregmin, acregmax, |
59 | acdirmin, acdirmax; |
60 | int namlen; |
61 | unsigned int options; |
62 | unsigned int bsize; |
63 | unsigned int auth_flavor_len; |
64 | rpc_authflavor_t auth_flavors[1]; |
65 | char *client_address; |
66 | unsigned int minorversion; |
67 | char *fscache_uniq; |
68 | |
69 | struct { |
70 | struct sockaddr_storage address; |
71 | size_t addrlen; |
72 | char *hostname; |
73 | u32 version; |
74 | unsigned short port; |
75 | unsigned short protocol; |
76 | } mount_server; |
77 | |
78 | struct { |
79 | struct sockaddr_storage address; |
80 | size_t addrlen; |
81 | char *hostname; |
82 | char *export_path; |
83 | unsigned short port; |
84 | unsigned short protocol; |
85 | } nfs_server; |
86 | |
87 | struct security_mnt_opts lsm_opts; |
88 | }; |
89 | |
90 | /* mount_clnt.c */ |
91 | struct nfs_mount_request { |
92 | struct sockaddr *sap; |
93 | size_t salen; |
94 | char *hostname; |
95 | char *dirpath; |
96 | u32 version; |
97 | unsigned short protocol; |
98 | struct nfs_fh *fh; |
99 | int noresvport; |
100 | unsigned int *auth_flav_len; |
101 | rpc_authflavor_t *auth_flavs; |
102 | }; |
103 | |
104 | extern int nfs_mount(struct nfs_mount_request *info); |
105 | |
106 | /* client.c */ |
107 | extern struct rpc_program nfs_program; |
108 | |
109 | extern void nfs_put_client(struct nfs_client *); |
110 | extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); |
111 | extern struct nfs_client *nfs_find_client_next(struct nfs_client *); |
112 | extern struct nfs_server *nfs_create_server( |
113 | const struct nfs_parsed_mount_data *, |
114 | struct nfs_fh *); |
115 | extern struct nfs_server *nfs4_create_server( |
116 | const struct nfs_parsed_mount_data *, |
117 | struct nfs_fh *); |
118 | extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, |
119 | struct nfs_fh *); |
120 | extern void nfs_free_server(struct nfs_server *server); |
121 | extern struct nfs_server *nfs_clone_server(struct nfs_server *, |
122 | struct nfs_fh *, |
123 | struct nfs_fattr *); |
124 | extern void nfs_mark_client_ready(struct nfs_client *clp, int state); |
125 | extern int nfs4_check_client_ready(struct nfs_client *clp); |
126 | #ifdef CONFIG_PROC_FS |
127 | extern int __init nfs_fs_proc_init(void); |
128 | extern void nfs_fs_proc_exit(void); |
129 | #else |
130 | static inline int nfs_fs_proc_init(void) |
131 | { |
132 | return 0; |
133 | } |
134 | static inline void nfs_fs_proc_exit(void) |
135 | { |
136 | } |
137 | #endif |
138 | |
139 | /* nfs4namespace.c */ |
140 | #ifdef CONFIG_NFS_V4 |
141 | extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); |
142 | #else |
143 | static inline |
144 | struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) |
145 | { |
146 | return ERR_PTR(-ENOENT); |
147 | } |
148 | #endif |
149 | |
150 | /* callback_xdr.c */ |
151 | extern struct svc_version nfs4_callback_version1; |
152 | |
153 | /* pagelist.c */ |
154 | extern int __init nfs_init_nfspagecache(void); |
155 | extern void nfs_destroy_nfspagecache(void); |
156 | extern int __init nfs_init_readpagecache(void); |
157 | extern void nfs_destroy_readpagecache(void); |
158 | extern int __init nfs_init_writepagecache(void); |
159 | extern void nfs_destroy_writepagecache(void); |
160 | |
161 | extern int __init nfs_init_directcache(void); |
162 | extern void nfs_destroy_directcache(void); |
163 | |
164 | /* nfs2xdr.c */ |
165 | extern int nfs_stat_to_errno(int); |
166 | extern struct rpc_procinfo nfs_procedures[]; |
167 | extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); |
168 | |
169 | /* nfs3xdr.c */ |
170 | extern struct rpc_procinfo nfs3_procedures[]; |
171 | extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); |
172 | |
173 | /* nfs4proc.c */ |
174 | static inline void nfs4_restart_rpc(struct rpc_task *task, |
175 | const struct nfs_client *clp) |
176 | { |
177 | #ifdef CONFIG_NFS_V4_1 |
178 | if (nfs4_has_session(clp) && |
179 | test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { |
180 | rpc_restart_call_prepare(task); |
181 | return; |
182 | } |
183 | #endif /* CONFIG_NFS_V4_1 */ |
184 | rpc_restart_call(task); |
185 | } |
186 | |
187 | /* nfs4xdr.c */ |
188 | #ifdef CONFIG_NFS_V4 |
189 | extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); |
190 | #endif |
191 | |
192 | /* nfs4proc.c */ |
193 | #ifdef CONFIG_NFS_V4 |
194 | extern struct rpc_procinfo nfs4_procedures[]; |
195 | #endif |
196 | |
197 | /* proc.c */ |
198 | void nfs_close_context(struct nfs_open_context *ctx, int is_sync); |
199 | |
200 | /* dir.c */ |
201 | extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); |
202 | |
203 | /* inode.c */ |
204 | extern struct workqueue_struct *nfsiod_workqueue; |
205 | extern struct inode *nfs_alloc_inode(struct super_block *sb); |
206 | extern void nfs_destroy_inode(struct inode *); |
207 | extern int nfs_write_inode(struct inode *,int); |
208 | extern void nfs_clear_inode(struct inode *); |
209 | #ifdef CONFIG_NFS_V4 |
210 | extern void nfs4_clear_inode(struct inode *); |
211 | #endif |
212 | void nfs_zap_acl_cache(struct inode *inode); |
213 | extern int nfs_wait_bit_killable(void *word); |
214 | |
215 | /* super.c */ |
216 | void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); |
217 | extern struct file_system_type nfs_xdev_fs_type; |
218 | #ifdef CONFIG_NFS_V4 |
219 | extern struct file_system_type nfs4_xdev_fs_type; |
220 | extern struct file_system_type nfs4_referral_fs_type; |
221 | #endif |
222 | |
223 | extern struct rpc_stat nfs_rpcstat; |
224 | |
225 | extern int __init register_nfs_fs(void); |
226 | extern void __exit unregister_nfs_fs(void); |
227 | extern void nfs_sb_active(struct super_block *sb); |
228 | extern void nfs_sb_deactive(struct super_block *sb); |
229 | |
230 | /* namespace.c */ |
231 | extern char *nfs_path(const char *base, |
232 | const struct dentry *droot, |
233 | const struct dentry *dentry, |
234 | char *buffer, ssize_t buflen); |
235 | |
236 | /* getroot.c */ |
237 | extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); |
238 | #ifdef CONFIG_NFS_V4 |
239 | extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); |
240 | |
241 | extern int nfs4_path_walk(struct nfs_server *server, |
242 | struct nfs_fh *mntfh, |
243 | const char *path); |
244 | #endif |
245 | |
246 | /* read.c */ |
247 | extern void nfs_read_prepare(struct rpc_task *task, void *calldata); |
248 | |
249 | /* write.c */ |
250 | extern void nfs_write_prepare(struct rpc_task *task, void *calldata); |
251 | |
252 | /* nfs4proc.c */ |
253 | extern 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); |
258 | extern 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 | |
264 | #ifdef CONFIG_NFS_V4_1 |
265 | extern void nfs41_sequence_free_slot(const struct nfs_client *, |
266 | struct nfs4_sequence_res *res); |
267 | #endif /* CONFIG_NFS_V4_1 */ |
268 | |
269 | static 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 | |
278 | /* |
279 | * Determine the device name as a string |
280 | */ |
281 | static inline char *nfs_devname(const struct vfsmount *mnt_parent, |
282 | const struct dentry *dentry, |
283 | char *buffer, ssize_t buflen) |
284 | { |
285 | return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, |
286 | dentry, buffer, buflen); |
287 | } |
288 | |
289 | /* |
290 | * Determine the actual block size (and log2 thereof) |
291 | */ |
292 | static inline |
293 | unsigned 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 | */ |
312 | static inline blkcnt_t nfs_calc_block_size(u64 tsize) |
313 | { |
314 | blkcnt_t used = (tsize + 511) >> 9; |
315 | return (used > ULONG_MAX) ? ULONG_MAX : used; |
316 | } |
317 | |
318 | /* |
319 | * Compute and set NFS server blocksize |
320 | */ |
321 | static inline |
322 | unsigned 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 | */ |
335 | static inline |
336 | void 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 | } |
342 | |
343 | /* |
344 | * Determine the number of bytes of data the page contains |
345 | */ |
346 | static inline |
347 | unsigned 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 | } |
360 | |
361 | /* |
362 | * Determine the number of pages in an array of length 'len' and |
363 | * with a base offset of 'base' |
364 | */ |
365 | static inline |
366 | unsigned 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 | } |
371 | |
372 | #define IPV6_SCOPE_DELIMITER '%' |
373 | |
374 | /* |
375 | * Set the port number in an address. Be agnostic about the address |
376 | * family. |
377 | */ |
378 | static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) |
379 | { |
380 | struct sockaddr_in *ap = (struct sockaddr_in *)sap; |
381 | struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; |
382 | |
383 | switch (sap->sa_family) { |
384 | case AF_INET: |
385 | ap->sin_port = htons(port); |
386 | break; |
387 | case AF_INET6: |
388 | ap6->sin6_port = htons(port); |
389 | break; |
390 | } |
391 | } |
392 |
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