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TOMOYO Linux Cross Reference
Linux/fs/nfs/internal.h

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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 static 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 
 42 static 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 
 48 static 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 
 59 struct 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;
 66         struct sockaddr *addr;
 67         size_t addrlen;
 68         rpc_authflavor_t authflavor;
 69 };
 70 
 71 /*
 72  * 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 /*
 78  * Value used if the user did not specify a port value.
 79  */
 80 #define NFS_UNSPEC_PORT         (-1)
 81 
 82 /*
 83  * 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 /*
 89  * In-kernel mount arguments
 90  */
 91 struct 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;
 98         unsigned int            options;
 99         unsigned int            bsize;
100         unsigned int            auth_flavor_len;
101         rpc_authflavor_t        auth_flavors[1];
102         char                    *client_address;
103         unsigned int            version;
104         unsigned int            minorversion;
105         char                    *fscache_uniq;
106 
107         struct {
108                 struct sockaddr_storage address;
109                 size_t                  addrlen;
110                 char                    *hostname;
111                 u32                     version;
112                 int                     port;
113                 unsigned short          protocol;
114         } mount_server;
115 
116         struct {
117                 struct sockaddr_storage address;
118                 size_t                  addrlen;
119                 char                    *hostname;
120                 char                    *export_path;
121                 int                     port;
122                 unsigned short          protocol;
123         } nfs_server;
124 
125         struct security_mnt_opts lsm_opts;
126 };
127 
128 /* mount_clnt.c */
129 struct 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;
137         int                     noresvport;
138         unsigned int            *auth_flav_len;
139         rpc_authflavor_t        *auth_flavs;
140 };
141 
142 extern int nfs_mount(struct nfs_mount_request *info);
143 extern void nfs_umount(const struct nfs_mount_request *info);
144 
145 /* client.c */
146 extern struct rpc_program nfs_program;
147 
148 extern void nfs_cleanup_cb_ident_idr(void);
149 extern void nfs_put_client(struct nfs_client *);
150 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
151 extern struct nfs_client *nfs4_find_client_ident(int);
152 extern struct nfs_client *
153 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
154 extern struct nfs_server *nfs_create_server(
155                                         const struct nfs_parsed_mount_data *,
156                                         struct nfs_fh *);
157 extern struct nfs_server *nfs4_create_server(
158                                         const struct nfs_parsed_mount_data *,
159                                         struct nfs_fh *);
160 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
161                                                       struct nfs_fh *);
162 extern void nfs_free_server(struct nfs_server *server);
163 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
164                                            struct nfs_fh *,
165                                            struct nfs_fattr *);
166 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
167 extern int nfs4_check_client_ready(struct nfs_client *clp);
168 extern 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);
171 #ifdef CONFIG_PROC_FS
172 extern int __init nfs_fs_proc_init(void);
173 extern void nfs_fs_proc_exit(void);
174 #else
175 static inline int nfs_fs_proc_init(void)
176 {
177         return 0;
178 }
179 static inline void nfs_fs_proc_exit(void)
180 {
181 }
182 #endif
183 
184 /* nfs4namespace.c */
185 #ifdef CONFIG_NFS_V4
186 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
187 #else
188 static inline
189 struct vfsmount *nfs_do_refmount(struct dentry *dentry)
190 {
191         return ERR_PTR(-ENOENT);
192 }
193 #endif
194 
195 /* callback_xdr.c */
196 extern struct svc_version nfs4_callback_version1;
197 extern struct svc_version nfs4_callback_version4;
198 
199 /* pagelist.c */
200 extern int __init nfs_init_nfspagecache(void);
201 extern void nfs_destroy_nfspagecache(void);
202 extern int __init nfs_init_readpagecache(void);
203 extern void nfs_destroy_readpagecache(void);
204 extern int __init nfs_init_writepagecache(void);
205 extern void nfs_destroy_writepagecache(void);
206 
207 extern int __init nfs_init_directcache(void);
208 extern void nfs_destroy_directcache(void);
209 
210 /* nfs2xdr.c */
211 extern int nfs_stat_to_errno(enum nfs_stat);
212 extern struct rpc_procinfo nfs_procedures[];
213 extern int nfs2_decode_dirent(struct xdr_stream *,
214                                 struct nfs_entry *, int);
215 
216 /* nfs3xdr.c */
217 extern struct rpc_procinfo nfs3_procedures[];
218 extern int nfs3_decode_dirent(struct xdr_stream *,
219                                 struct nfs_entry *, int);
220 
221 /* nfs4xdr.c */
222 #ifdef CONFIG_NFS_V4
223 extern int nfs4_decode_dirent(struct xdr_stream *,
224                                 struct nfs_entry *, int);
225 #endif
226 #ifdef CONFIG_NFS_V4_1
227 extern const u32 nfs41_maxread_overhead;
228 extern const u32 nfs41_maxwrite_overhead;
229 #endif
230 
231 /* nfs4proc.c */
232 #ifdef CONFIG_NFS_V4
233 extern struct rpc_procinfo nfs4_procedures[];
234 void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
235 #endif
236 
237 extern int nfs4_init_ds_session(struct nfs_client *clp);
238 
239 /* proc.c */
240 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
241 extern 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);
245 
246 /* dir.c */
247 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
248                                         int nr_to_scan, gfp_t gfp_mask);
249 
250 /* inode.c */
251 extern struct workqueue_struct *nfsiod_workqueue;
252 extern struct inode *nfs_alloc_inode(struct super_block *sb);
253 extern void nfs_destroy_inode(struct inode *);
254 extern int nfs_write_inode(struct inode *, struct writeback_control *);
255 extern void nfs_evict_inode(struct inode *);
256 #ifdef CONFIG_NFS_V4
257 extern void nfs4_evict_inode(struct inode *);
258 #endif
259 void nfs_zap_acl_cache(struct inode *inode);
260 extern int nfs_wait_bit_killable(void *word);
261 
262 /* super.c */
263 extern struct file_system_type nfs_xdev_fs_type;
264 #ifdef CONFIG_NFS_V4
265 extern struct file_system_type nfs4_xdev_fs_type;
266 extern struct file_system_type nfs4_referral_fs_type;
267 #endif
268 
269 extern struct rpc_stat nfs_rpcstat;
270 
271 extern int __init register_nfs_fs(void);
272 extern void __exit unregister_nfs_fs(void);
273 extern void nfs_sb_active(struct super_block *sb);
274 extern void nfs_sb_deactive(struct super_block *sb);
275 
276 /* namespace.c */
277 extern char *nfs_path(char **p, struct dentry *dentry,
278                       char *buffer, ssize_t buflen);
279 extern struct vfsmount *nfs_d_automount(struct path *path);
280 
281 /* getroot.c */
282 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
283                                    const char *);
284 #ifdef CONFIG_NFS_V4
285 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
286                                     const char *);
287 
288 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
289 #endif
290 
291 /* read.c */
292 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
293                              const struct rpc_call_ops *call_ops);
294 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
295 
296 /* write.c */
297 extern void nfs_commit_free(struct nfs_write_data *p);
298 extern int nfs_initiate_write(struct nfs_write_data *data,
299                               struct rpc_clnt *clnt,
300                               const struct rpc_call_ops *call_ops,
301                               int how);
302 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
303 extern int nfs_initiate_commit(struct nfs_write_data *data,
304                                struct rpc_clnt *clnt,
305                                const struct rpc_call_ops *call_ops,
306                                int how);
307 extern void nfs_init_commit(struct nfs_write_data *data,
308                             struct list_head *head,
309                             struct pnfs_layout_segment *lseg);
310 void nfs_retry_commit(struct list_head *page_list,
311                       struct pnfs_layout_segment *lseg);
312 void nfs_commit_clear_lock(struct nfs_inode *nfsi);
313 void nfs_commitdata_release(void *data);
314 void nfs_commit_release_pages(struct nfs_write_data *data);
315 
316 #ifdef CONFIG_MIGRATION
317 extern int nfs_migrate_page(struct address_space *,
318                 struct page *, struct page *);
319 #else
320 #define nfs_migrate_page NULL
321 #endif
322 
323 /* nfs4proc.c */
324 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
325 extern int nfs4_init_client(struct nfs_client *clp,
326                             const struct rpc_timeout *timeparms,
327                             const char *ip_addr,
328                             rpc_authflavor_t authflavour,
329                             int noresvport);
330 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
331 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
332                            struct nfs_server *server,
333                            struct rpc_message *msg,
334                            struct nfs4_sequence_args *args,
335                            struct nfs4_sequence_res *res,
336                            int cache_reply);
337 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
338                                    struct nfs_server *server,
339                                    struct rpc_message *msg,
340                                    struct nfs4_sequence_args *args,
341                                    struct nfs4_sequence_res *res,
342                                    int cache_reply);
343 
344 /*
345  * Determine the device name as a string
346  */
347 static inline char *nfs_devname(struct dentry *dentry,
348                                 char *buffer, ssize_t buflen)
349 {
350         char *dummy;
351         return nfs_path(&dummy, dentry, buffer, buflen);
352 }
353 
354 /*
355  * Determine the actual block size (and log2 thereof)
356  */
357 static inline
358 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
359 {
360         /* make sure blocksize is a power of two */
361         if ((bsize & (bsize - 1)) || nrbitsp) {
362                 unsigned char   nrbits;
363 
364                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
365                         ;
366                 bsize = 1 << nrbits;
367                 if (nrbitsp)
368                         *nrbitsp = nrbits;
369         }
370 
371         return bsize;
372 }
373 
374 /*
375  * Calculate the number of 512byte blocks used.
376  */
377 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
378 {
379         blkcnt_t used = (tsize + 511) >> 9;
380         return (used > ULONG_MAX) ? ULONG_MAX : used;
381 }
382 
383 /*
384  * Compute and set NFS server blocksize
385  */
386 static inline
387 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
388 {
389         if (bsize < NFS_MIN_FILE_IO_SIZE)
390                 bsize = NFS_DEF_FILE_IO_SIZE;
391         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
392                 bsize = NFS_MAX_FILE_IO_SIZE;
393 
394         return nfs_block_bits(bsize, nrbitsp);
395 }
396 
397 /*
398  * Determine the maximum file size for a superblock
399  */
400 static inline
401 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
402 {
403         sb->s_maxbytes = (loff_t)maxfilesize;
404         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
405                 sb->s_maxbytes = MAX_LFS_FILESIZE;
406 }
407 
408 /*
409  * Determine the number of bytes of data the page contains
410  */
411 static inline
412 unsigned int nfs_page_length(struct page *page)
413 {
414         loff_t i_size = i_size_read(page->mapping->host);
415 
416         if (i_size > 0) {
417                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
418                 if (page->index < end_index)
419                         return PAGE_CACHE_SIZE;
420                 if (page->index == end_index)
421                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
422         }
423         return 0;
424 }
425 
426 /*
427  * Convert a umode to a dirent->d_type
428  */
429 static inline
430 unsigned char nfs_umode_to_dtype(umode_t mode)
431 {
432         return (mode >> 12) & 15;
433 }
434 
435 /*
436  * Determine the number of pages in an array of length 'len' and
437  * with a base offset of 'base'
438  */
439 static inline
440 unsigned int nfs_page_array_len(unsigned int base, size_t len)
441 {
442         return ((unsigned long)len + (unsigned long)base +
443                 PAGE_SIZE - 1) >> PAGE_SHIFT;
444 }
445 
446 /*
447  * Helper for restarting RPC calls in the possible presence of NFSv4.1
448  * sessions.
449  */
450 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
451 {
452         if (nfs4_has_session(clp))
453                 return rpc_restart_call_prepare(task);
454         return rpc_restart_call(task);
455 }
456 

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