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7378 exported_lock held during nfs4 compound processing
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--- old/usr/src/uts/common/nfs/export.h
+++ new/usr/src/uts/common/nfs/export.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
24 24 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
25 25 */
26 26
27 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 28 /* All Rights Reserved */
29 29
30 30 #ifndef _NFS_EXPORT_H
31 31 #define _NFS_EXPORT_H
32 32
33 33 #include <nfs/nfs_sec.h>
34 34 #include <nfs/auth.h>
35 35 #include <sys/vnode.h>
36 36 #include <nfs/nfs4.h>
37 37 #include <sys/kiconv.h>
38 38 #include <sys/avl.h>
39 39
40 40 #ifdef __cplusplus
41 41 extern "C" {
42 42 #endif
43 43
44 44 /*
45 45 * nfs pseudo flavor number is owned by IANA. Need to make sure the
46 46 * Solaris specific NFS_FLAVOR_NOMAP number will not overlap with any
47 47 * new IANA defined pseudo flavor numbers. The chance for the overlap
48 48 * is very small since the growth of new flavor numbers is expected
49 49 * to be limited.
50 50 */
51 51 #define NFS_FLAVOR_NOMAP 999999 /* no nfs flavor mapping */
52 52
53 53 /*
54 54 * As duplicate flavors can be passed into exportfs in the arguments, we
55 55 * allocate a cleaned up array with non duplicate flavors on the stack.
56 56 * So we need to know how much to allocate.
57 57 */
58 58 #define MAX_FLAVORS 6 /* none, sys, dh, krb5, krb5i krb5p */
59 59
60 60 /*
61 61 * Note: exported_lock is currently used to ensure the integrity of
62 62 * the secinfo fields.
63 63 */
64 64 struct secinfo {
65 65 seconfig_t s_secinfo; /* /etc/nfssec.conf entry */
66 66 unsigned int s_flags; /* flags (see below) */
67 67 int32_t s_refcnt; /* reference count for tracking */
68 68 /* how many children (self included) */
69 69 /* use this flavor. */
70 70 int s_window; /* window */
71 71 uint_t s_rootid; /* UID to use for authorized roots */
72 72 int s_rootcnt; /* count of root names */
73 73 caddr_t *s_rootnames; /* array of root names */
74 74 /* they are strings for AUTH_DES and */
75 75 /* rpc_gss_principal_t for RPCSEC_GSS */
76 76 };
77 77
78 78 #ifdef _SYSCALL32
79 79 struct secinfo32 {
80 80 seconfig32_t s_secinfo; /* /etc/nfssec.conf entry */
81 81 uint32_t s_flags; /* flags (see below) */
82 82 int32_t s_refcnt; /* reference count for tracking */
83 83 /* how many children (self included) */
84 84 /* use this flavor. */
85 85 int32_t s_window; /* window */
86 86 uint32_t s_rootid; /* UID to use for authorized roots */
87 87 int32_t s_rootcnt; /* count of root names */
88 88 caddr32_t s_rootnames; /* array of root names */
89 89 /* they are strings for AUTH_DES and */
90 90 /* rpc_gss_principal_t for RPCSEC_GSS */
91 91 };
92 92 #endif /* _SYSCALL32 */
93 93
94 94 /*
95 95 * security negotiation related
96 96 */
97 97
98 98 #define SEC_QUERY 0x01 /* query sec modes */
99 99
100 100 struct sec_ol {
101 101 int sec_flags; /* security nego flags */
102 102 uint_t sec_index; /* index into sec flavor array */
103 103 };
104 104
105 105 /*
106 106 * Per-mode flags (secinfo.s_flags)
107 107 */
108 108 #define M_RO 0x01 /* exported ro to all */
109 109 #define M_ROL 0x02 /* exported ro to all listed */
110 110 #define M_RW 0x04 /* exported rw to all */
111 111 #define M_RWL 0x08 /* exported ro to all listed */
112 112 #define M_ROOT 0x10 /* root list is defined */
113 113 #define M_4SEC_EXPORTED 0x20 /* this is an explicitly shared flavor */
114 114 #define M_NONE 0x40 /* none list is defined */
115 115 #define M_MAP 0x80 /* uidmap and/or gidmap is defined */
116 116
117 117 /* invalid secinfo reference count */
118 118 #define SEC_REF_INVALID(p) ((p)->s_refcnt < 1)
119 119
120 120 /* last secinfo reference */
121 121 #define SEC_REF_LAST(p) ((p)->s_refcnt == 1)
122 122
123 123 /* sec flavor explicitly shared for the exported node */
124 124 #define SEC_REF_EXPORTED(p) ((p)->s_flags & M_4SEC_EXPORTED)
125 125
126 126 /* the only reference count left is for referring itself */
127 127 #define SEC_REF_SELF(p) (SEC_REF_LAST(p) && SEC_REF_EXPORTED(p))
128 128
129 129 /*
130 130 * The export information passed to exportfs() (Version 2)
131 131 */
132 132 #define EX_CURRENT_VERSION 2 /* current version of exportdata struct */
133 133
134 134 struct exportdata {
135 135 int ex_version; /* structure version */
136 136 char *ex_path; /* exported path */
137 137 size_t ex_pathlen; /* path length */
138 138 int ex_flags; /* flags */
139 139 unsigned int ex_anon; /* uid for unauthenticated requests */
140 140 int ex_seccnt; /* count of security modes */
141 141 struct secinfo *ex_secinfo; /* security mode info */
142 142 char *ex_index; /* index file for public filesystem */
143 143 char *ex_log_buffer; /* path to logging buffer file */
144 144 size_t ex_log_bufferlen; /* buffer file path len */
145 145 char *ex_tag; /* tag used to identify log config */
146 146 size_t ex_taglen; /* tag length */
147 147 };
148 148
149 149 #ifdef _SYSCALL32
150 150 struct exportdata32 {
151 151 int32_t ex_version; /* structure version */
152 152 caddr32_t ex_path; /* exported path */
153 153 int32_t ex_pathlen; /* path length */
154 154 int32_t ex_flags; /* flags */
155 155 uint32_t ex_anon; /* uid for unauthenticated requests */
156 156 int32_t ex_seccnt; /* count of security modes */
157 157 caddr32_t ex_secinfo; /* security mode info */
158 158 caddr32_t ex_index; /* index file for public filesystem */
159 159 caddr32_t ex_log_buffer; /* path to logging buffer file */
160 160 int32_t ex_log_bufferlen; /* buffer file path len */
161 161 caddr32_t ex_tag; /* tag used to identify log config */
162 162 int32_t ex_taglen; /* tag length */
163 163 };
164 164 #endif /* _SYSCALL32 */
165 165
166 166 /*
167 167 * exported vfs flags.
168 168 */
169 169
170 170 #define EX_NOSUID 0x01 /* exported with unsetable set[ug]ids */
171 171 #define EX_ACLOK 0x02 /* exported with maximal access if acl exists */
172 172 #define EX_PUBLIC 0x04 /* exported with public filehandle */
173 173 #define EX_NOSUB 0x08 /* no nfs_getfh or MCL below export point */
174 174 #define EX_INDEX 0x10 /* exported with index file specified */
175 175 #define EX_LOG 0x20 /* logging enabled */
176 176 #define EX_LOG_ALLOPS 0x40 /* logging of all RPC operations enabled */
177 177 /* by default only operations which affect */
178 178 /* transaction logging are enabled */
179 179 #define EX_PSEUDO 0x80 /* pseudo filesystem export */
180 180 #ifdef VOLATILE_FH_TEST
181 181 #define EX_VOLFH 0x100 /* XXX nfsv4 fh may expire anytime */
182 182 #define EX_VOLRNM 0x200 /* XXX nfsv4 fh expire at rename */
183 183 #define EX_VOLMIG 0x400 /* XXX nfsv4 fh expire at migration */
184 184 #define EX_NOEXPOPEN 0x800 /* XXX nfsv4 fh no expire with open */
185 185 #endif /* VOLATILE_FH_TEST */
186 186
187 187 #define EX_CHARMAP 0x1000 /* NFS may need a character set conversion */
188 188 #define EX_NOACLFAB 0x2000 /* If set, NFSv2 and v3 servers doesn't */
189 189 /* fabricate ACL for VOP_GETSECATTR OTW call */
190 190
191 191 #ifdef _KERNEL
192 192
193 193 #define RPC_IDEMPOTENT 0x1 /* idempotent or not */
194 194 /*
195 195 * Be very careful about which NFS procedures get the RPC_ALLOWANON bit.
196 196 * Right now, if this bit is on, we ignore the results of per NFS request
197 197 * access control.
198 198 */
199 199 #define RPC_ALLOWANON 0x2 /* allow anonymous access */
200 200 #define RPC_MAPRESP 0x4 /* use mapped response buffer */
201 201 #define RPC_AVOIDWORK 0x8 /* do work avoidance for dups */
202 202 #define RPC_PUBLICFH_OK 0x10 /* allow use of public filehandle */
203 203
204 204 /*
205 205 * RPC_ALL is an or of all above bits to be used with "don't care"
206 206 * nfsv4 ops. The flags of an nfsv4 request is the bit-AND of the
207 207 * per-op flags.
208 208 */
209 209 #define RPC_ALL (RPC_IDEMPOTENT|RPC_ALLOWANON|RPC_AVOIDWORK|RPC_PUBLICFH_OK)
210 210
211 211
212 212 #ifdef VOLATILE_FH_TEST
213 213 struct ex_vol_rename {
214 214 nfs_fh4_fmt_t vrn_fh_fmt;
215 215 struct ex_vol_rename *vrn_next;
216 216 };
217 217 #endif /* VOLATILE_FH_TEST */
218 218
219 219 /*
220 220 * An auth cache client entry. This is the umbrella structure and contains all
221 221 * related auth_cache entries in the authc_tree AVL tree.
222 222 */
223 223 struct auth_cache_clnt {
224 224 avl_node_t authc_link;
225 225 struct netbuf authc_addr; /* address of the client */
226 226 krwlock_t authc_lock; /* protects authc_tree */
227 227 avl_tree_t authc_tree; /* auth_cache entries */
228 228 };
229 229
230 230 /*
231 231 * An auth cache entry can exist in 6 states.
232 232 *
233 233 * A NEW entry was recently allocated and added to the cache. It does not
234 234 * contain the valid auth state yet.
235 235 *
236 236 * A WAITING entry is one which is actively engaging the user land mountd code
237 237 * to authenticate or re-authenticate it. The auth state might not be valid
238 238 * yet. The other threads should wait on auth_cv until the retrieving thread
239 239 * finishes the retrieval and changes the auth cache entry to FRESH, or NEW (in
240 240 * a case this entry had no valid auth state yet).
241 241 *
242 242 * A REFRESHING entry is one which is actively engaging the user land mountd
243 243 * code to re-authenticate the cache entry. There is currently no other thread
244 244 * waiting for the results of the refresh.
245 245 *
246 246 * A FRESH entry is one which is valid (it is either newly retrieved or has
247 247 * been refreshed at least once).
248 248 *
249 249 * A STALE entry is one which has been detected to be too old. The transition
250 250 * from FRESH to STALE prevents multiple threads from submitting refresh
251 251 * requests.
252 252 *
253 253 * An INVALID entry is one which was either STALE or REFRESHING and was deleted
254 254 * out of the encapsulating exi. Since we can't delete it yet, we mark it as
255 255 * INVALID, which lets the refresh thread know not to work on it and free it
256 256 * instead.
257 257 *
258 258 * Note that the auth state of the entry is valid, even if the entry is STALE.
259 259 * Just as you can eat stale bread, you can consume a stale cache entry. The
260 260 * only time the contents change could be during the transition from REFRESHING
261 261 * or WAITING to FRESH.
262 262 *
263 263 * Valid state transitions:
264 264 *
265 265 * alloc
266 266 * |
267 267 * v
268 268 * +-----+
269 269 * +--->| NEW |------>free
270 270 * | +-----+
271 271 * | |
272 272 * | v
273 273 * | +---------+
274 274 * +<-| WAITING |
275 275 * ^ +---------+
276 276 * | |
277 277 * | v
278 278 * | +<--------------------------+<---------------+
279 279 * | | ^ |
280 280 * | v | |
281 281 * | +-------+ +-------+ +------------+ +---------+
282 282 * +---| FRESH |--->| STALE |--->| REFRESHING |--->| WAITING |
283 283 * +-------+ +-------+ +------------+ +---------+
284 284 * | | |
285 285 * | v |
286 286 * v +---------+ |
287 287 * free<-----| INVALID |<--------+
288 288 * +---------+
289 289 */
290 290 typedef enum auth_state {
291 291 NFS_AUTH_FRESH,
292 292 NFS_AUTH_STALE,
293 293 NFS_AUTH_REFRESHING,
294 294 NFS_AUTH_INVALID,
295 295 NFS_AUTH_NEW,
296 296 NFS_AUTH_WAITING
297 297 } auth_state_t;
298 298
299 299 /*
300 300 * An authorization cache entry
301 301 *
302 302 * Either the state in auth_state will protect the
303 303 * contents or auth_lock must be held.
304 304 */
305 305 struct auth_cache {
306 306 avl_node_t auth_link;
307 307 struct auth_cache_clnt *auth_clnt;
308 308 int auth_flavor;
309 309 cred_t *auth_clnt_cred;
310 310 uid_t auth_srv_uid;
311 311 gid_t auth_srv_gid;
312 312 uint_t auth_srv_ngids;
313 313 gid_t *auth_srv_gids;
314 314 int auth_access;
315 315 time_t auth_time;
316 316 time_t auth_freshness;
317 317 auth_state_t auth_state;
318 318 kmutex_t auth_lock;
319 319 kcondvar_t auth_cv;
320 320 };
321 321
322 322 #define AUTH_TABLESIZE 32
323 323
324 324 /*
325 325 * Structure containing log file meta-data.
326 326 */
327 327 struct log_file {
328 328 unsigned int lf_flags; /* flags (see below) */
329 329 int lf_writers; /* outstanding writers */
330 330 int lf_refcnt; /* references to this struct */
331 331 caddr_t lf_path; /* buffer file location */
332 332 vnode_t *lf_vp; /* vnode for the buffer file */
333 333 kmutex_t lf_lock;
334 334 kcondvar_t lf_cv_waiters;
335 335 };
336 336
337 337 /*
338 338 * log_file and log_buffer flags.
339 339 */
340 340 #define L_WAITING 0x01 /* flush of in-core data to stable */
341 341 /* storage in progress */
342 342 #define L_PRINTED 0x02 /* error message printed to console */
343 343 #define L_ERROR 0x04 /* error condition detected */
344 344
345 345 /*
346 346 * The logging buffer information.
347 347 * This structure may be shared by multiple exportinfo structures,
348 348 * if they share the same buffer file.
349 349 * This structure contains the basic information about the buffer, such
350 350 * as it's location in the filesystem.
351 351 *
352 352 * 'lb_lock' protects all the fields in this structure except for 'lb_path',
353 353 * and 'lb_next'.
354 354 * 'lb_path' is a write-once/read-many field which needs no locking, it is
355 355 * set before the structure is linked to any exportinfo structure.
356 356 * 'lb_next' is protected by the log_buffer_list_lock.
357 357 */
358 358 struct log_buffer {
359 359 unsigned int lb_flags; /* L_ONLIST set? */
360 360 int lb_refcnt; /* references to this struct */
361 361 unsigned int lb_rec_id; /* used to generate unique id */
362 362 caddr_t lb_path; /* buffer file pathname */
363 363 struct log_file *lb_logfile; /* points to log_file structure */
364 364 kmutex_t lb_lock;
365 365 struct log_buffer *lb_next;
366 366 kcondvar_t lb_cv_waiters;
367 367 caddr_t lb_records; /* linked list of records to write */
368 368 int lb_num_recs; /* # of records to write */
369 369 ssize_t lb_size_queued; /* number of bytes queued for write */
370 370 };
371 371
372 372 #define LOG_BUFFER_HOLD(lbp) { \
373 373 mutex_enter(&(lbp)->lb_lock); \
374 374 (lbp)->lb_refcnt++; \
375 375 mutex_exit(&(lbp)->lb_lock); \
376 376 }
377 377
378 378 #define LOG_BUFFER_RELE(lbp) { \
379 379 log_buffer_rele(lbp); \
380 380 }
381 381
382 382 /*
383 383 * Structure for character set conversion mapping based on client address.
384 384 */
385 385 struct charset_cache {
386 386 struct charset_cache *next;
387 387 kiconv_t inbound;
388 388 kiconv_t outbound;
389 389 struct sockaddr client_addr;
390 390 };
391 391
392 392 /* Forward declarations */
393 393 struct exportinfo;
394 394 struct exp_visible;
395 395 struct svc_req;
396 396
397 397 /*
398 398 * Treenodes are used to build tree representing every node which is part
399 399 * of nfs server pseudo namespace. They are connected with both exportinfo
400 400 * and exp_visible struct. They were introduced to avoid lookup of ".."
401 401 * in the underlying file system during unshare, which was failing if the
402 402 * file system was forcibly unmounted or if the directory was removed.
403 403 * One exp_visible_t can be shared via several treenode_t, i.e.
404 404 * different tree_vis can point to the same exp_visible_t.
405 405 * This will happen if some directory is on two different shared paths:
406 406 * E.g. after share /tmp/a/b1 and share /tmp/a/b2 there will be two treenodes
407 407 * corresponding to /tmp/a and both will have same value in tree_vis.
408 408 *
409 409 *
410 410 *
411 411 * NEW DATA STRUCT ORIGINAL DATA STRUCT
412 412 *
413 413 * ns_root +---+ +----------+
414 414 * | / | |PSEUDO EXP|-->+---+ +---+ +---+
415 415 * +---+--------- ----+----------+ | a |-->| k |-->| b |
416 416 * /\ +---+ +---+ +---+
417 417 * / \ . . .
418 418 * +---+...\......... ..................... . .
419 419 * *| a | \ +----------+ . .
420 420 * +---+-----\------- ----|REAL EXP a| . .
421 421 * / \ +----------+ . .
422 422 * / +===+... ............................. .
423 423 * / *| k | +----------+ .
424 424 * / +===+--- ----|REAL EXP k| .
425 425 * / +----------+ .
426 426 * +===+................ .....................................
427 427 * *| b | +----------+
428 428 * +===+---------------- ----|REAL EXP b|-->+---+
429 429 * \ +----------+ | d |
430 430 * +===+............. ...................+---+
431 431 * | d | +----------+
432 432 * +===+------------- ----|PSEUDO EXP|-->+---+ +---+
433 433 * / +----------+ | e |-->| g |
434 434 * +---+................. ...................+---+ +---+
435 435 * | e | .
436 436 * +---+ .
437 437 * \ .
438 438 * +---+.............. ............................
439 439 * *| g | +----------+
440 440 * +---+-------------- ----|REAL EXP g|
441 441 * +----------+
442 442 *
443 443 *
444 444 *
445 445 * +===+ +---+ +---+
446 446 * | b |..mountpoint | e |..directory/file *| a |..node is shared
447 447 * +===+ (VROOT) +---+ +---+
448 448 *
449 449 *
450 450 * Bi-directional interconnect:
451 451 * treenode_t::tree_exi --------- exportinfo_t::exi_tree
452 452 * One-way direction connection:
453 453 * treenode_t::tree_vis .........> exp_visible_t
454 454 */
455 455 /* Access to treenode_t is under protection of exported_lock RW_LOCK */
456 456 typedef struct treenode {
457 457 /* support for generic n-ary trees */
458 458 struct treenode *tree_parent;
459 459 struct treenode *tree_child_first;
460 460 struct treenode *tree_sibling; /* next sibling */
461 461 /* private, nfs specific part */
462 462 struct exportinfo *tree_exi;
463 463 struct exp_visible *tree_vis;
464 464 } treenode_t;
465 465
466 466 /*
467 467 * TREE_ROOT checks if the node corresponds to a filesystem root
468 468 * TREE_EXPORTED checks if the node is explicitly shared
469 469 */
470 470
471 471 #define TREE_ROOT(t) \
472 472 ((t)->tree_exi && (t)->tree_exi->exi_vp->v_flag & VROOT)
473 473
474 474 #define TREE_EXPORTED(t) \
475 475 ((t)->tree_exi && !PSEUDO((t)->tree_exi))
476 476
477 477 /* Root of nfs pseudo namespace */
478 478 extern treenode_t *ns_root;
479 479
480 480 #define EXPTABLESIZE 256
481 481
482 482 struct exp_hash {
483 483 struct exportinfo *prev; /* ptr to the previous exportinfo */
484 484 struct exportinfo *next; /* ptr to the next exportinfo */
485 485 struct exportinfo **bckt; /* backpointer to the hash bucket */
486 486 };
487 487
488 488 /*
489 489 * A node associated with an export entry on the
490 490 * list of exported filesystems.
491 491 *
492 492 * exi_count+exi_lock protects an individual exportinfo from being freed
493 493 * when in use.
494 494 *
495 495 * You must have the writer lock on exported_lock to add/delete an exportinfo
496 496 * structure to/from the list.
497 497 *
498 498 * exi_volatile_dev maps to VSW_VOLATILEDEV. It means that the
499 499 * underlying fs devno can change on each mount. When set, the server
500 500 * should not use va_fsid for a GETATTR(FATTR4_FSID) reply. It must
501 501 * use exi_fsid because it is guaranteed to be persistent. This isn't
502 502 * in any way related to NFS4 volatile filehandles.
503 503 *
504 504 * The exi_cache_lock protects the exi_cache AVL trees.
505 505 */
506 506 struct exportinfo {
507 507 struct exportdata exi_export;
508 508 fsid_t exi_fsid;
509 509 struct fid exi_fid;
510 510 struct exp_hash fid_hash;
511 511 struct exp_hash path_hash;
512 512 struct treenode *exi_tree;
513 513 fhandle_t exi_fh;
514 514 krwlock_t exi_cache_lock;
515 515 kmutex_t exi_lock;
516 516 uint_t exi_count;
517 517 vnode_t *exi_vp;
518 518 vnode_t *exi_dvp;
519 519 avl_tree_t *exi_cache[AUTH_TABLESIZE];
520 520 struct log_buffer *exi_logbuffer;
521 521 struct exp_visible *exi_visible;
522 522 struct charset_cache *exi_charset;
523 523 unsigned exi_volatile_dev:1;
524 524 unsigned exi_moved:1;
525 525 #ifdef VOLATILE_FH_TEST
526 526 uint32_t exi_volatile_id;
527 527 struct ex_vol_rename *exi_vol_rename;
528 528 kmutex_t exi_vol_rename_lock;
529 529 #endif /* VOLATILE_FH_TEST */
530 530 };
531 531
532 532 typedef struct exportinfo exportinfo_t;
533 533 typedef struct exportdata exportdata_t;
534 534 typedef struct secinfo secinfo_t;
535 535
536 536 /*
537 537 * exp_visible is a visible list per filesystem. It is for filesystems
538 538 * that may need a limited view of its contents. A pseudo export and
539 539 * a real export at the mount point (VROOT) which has a subtree shared
540 540 * has a visible list.
541 541 *
542 542 * The exi_visible field is NULL for normal, non=pseudo filesystems
543 543 * which do not have any subtree exported. If the field is non-null,
544 544 * it points to a list of visible entries, identified by vis_fid and/or
545 545 * vis_ino. The presence of a "visible" list means that if this export
546 546 * can only have a limited view, it can only view the entries in the
547 547 * exp_visible list. The directories in the fid list comprise paths that
548 548 * lead to exported directories.
549 549 *
550 550 * The vis_count field records the number of paths in this filesystem
551 551 * that use this directory. The vis_exported field is non-zero if the
552 552 * entry is an exported directory (leaf node).
553 553 *
554 554 * exp_visible itself is not reference counted. Each exp_visible is
555 555 * referenced twice:
556 556 * 1) from treenode::tree_vis
557 557 * 2) linked from exportinfo::exi_visible
558 558 * The 'owner' of exp_visible is the exportinfo structure. exp_visible should
559 559 * be always freed only from exportinfo_t, never from treenode::tree_vis.
560 560 */
561 561
562 562 struct exp_visible {
563 563 vnode_t *vis_vp;
564 564 fid_t vis_fid;
565 565 u_longlong_t vis_ino;
566 566 int vis_count;
567 567 int vis_exported;
568 568 struct exp_visible *vis_next;
569 569 struct secinfo *vis_secinfo;
570 570 int vis_seccnt;
571 571 };
572 572 typedef struct exp_visible exp_visible_t;
573 573
574 574 #define PSEUDO(exi) ((exi)->exi_export.ex_flags & EX_PSEUDO)
575 575 #define EXP_LINKED(exi) ((exi)->fid_hash.bckt != NULL)
576 576
577 577 #define EQFSID(fsidp1, fsidp2) \
578 578 (((fsidp1)->val[0] == (fsidp2)->val[0]) && \
579 579 ((fsidp1)->val[1] == (fsidp2)->val[1]))
580 580
581 581 #define EQFID(fidp1, fidp2) \
582 582 ((fidp1)->fid_len == (fidp2)->fid_len && \
583 583 bcmp((char *)(fidp1)->fid_data, (char *)(fidp2)->fid_data, \
584 584 (uint_t)(fidp1)->fid_len) == 0)
585 585
586 586 #define exportmatch(exi, fsid, fid) \
587 587 (EQFSID(&(exi)->exi_fsid, (fsid)) && EQFID(&(exi)->exi_fid, (fid)))
588 588
589 589 /*
590 590 * Returns true iff exported filesystem is read-only to the given host.
591 591 *
592 592 * Note: this macro should be as fast as possible since it's called
593 593 * on each NFS modification request.
594 594 */
595 595 #define rdonly(ro, vp) ((ro) || vn_is_readonly(vp))
596 596 #define rdonly4(req, cs) \
597 597 (vn_is_readonly((cs)->vp) || \
598 598 (nfsauth4_access((cs)->exi, (cs)->vp, (req), (cs)->basecr, NULL, \
599 599 NULL, NULL, NULL) & (NFSAUTH_RO | NFSAUTH_LIMITED)))
600 600
601 601 extern int nfsauth4_access(struct exportinfo *, vnode_t *,
602 602 struct svc_req *, cred_t *, uid_t *, gid_t *, uint_t *, gid_t **);
603 603 extern int nfsauth4_secinfo_access(struct exportinfo *,
604 604 struct svc_req *, int, int, cred_t *);
605 605 extern int nfsauth_cache_clnt_compar(const void *, const void *);
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606 606 extern int nfs_fhbcmp(char *, char *, int);
607 607 extern int nfs_exportinit(void);
608 608 extern void nfs_exportfini(void);
609 609 extern int chk_clnt_sec(struct exportinfo *, struct svc_req *);
610 610 extern int makefh(fhandle_t *, struct vnode *, struct exportinfo *);
611 611 extern int makefh_ol(fhandle_t *, struct exportinfo *, uint_t);
612 612 extern int makefh3(nfs_fh3 *, struct vnode *, struct exportinfo *);
613 613 extern int makefh3_ol(nfs_fh3 *, struct exportinfo *, uint_t);
614 614 extern vnode_t *nfs_fhtovp(fhandle_t *, struct exportinfo *);
615 615 extern vnode_t *nfs3_fhtovp(nfs_fh3 *, struct exportinfo *);
616 -extern struct exportinfo *checkexport(fsid_t *, struct fid *);
617 -extern struct exportinfo *checkexport4(fsid_t *, struct fid *, vnode_t *);
616 +extern struct exportinfo *checkexport(fsid_t *, struct fid *, vnode_t *);
617 +extern struct exportinfo *checkexport_nohold(fsid_t *, struct fid *,
618 + vnode_t *);
618 619 extern void exi_hold(struct exportinfo *);
619 620 extern void exi_rele(struct exportinfo *);
620 621 extern struct exportinfo *nfs_vptoexi(vnode_t *, vnode_t *, cred_t *, int *,
621 622 int *, bool_t);
622 623 extern int nfs_check_vpexi(vnode_t *, vnode_t *, cred_t *,
623 624 struct exportinfo **);
624 625 extern void export_link(struct exportinfo *);
625 626 extern void export_unlink(struct exportinfo *);
626 627 extern vnode_t *untraverse(vnode_t *);
627 628 extern int vn_is_nfs_reparse(vnode_t *, cred_t *);
628 629 extern int client_is_downrev(struct svc_req *);
629 630 extern char *build_symlink(vnode_t *, cred_t *, size_t *);
630 631
631 632 /*
632 633 * Functions that handle the NFSv4 server namespace
633 634 */
634 635 extern exportinfo_t *vis2exi(treenode_t *);
635 636 extern int treeclimb_export(struct exportinfo *);
636 637 extern void treeclimb_unexport(struct exportinfo *);
637 638 extern int nfs_visible(struct exportinfo *, vnode_t *, int *);
638 639 extern int nfs_visible_inode(struct exportinfo *, ino64_t, int *);
639 640 extern int has_visible(struct exportinfo *, vnode_t *);
640 641 extern void free_visible(struct exp_visible *);
641 642 extern int nfs_exported(struct exportinfo *, vnode_t *);
642 643 extern struct exportinfo *pseudo_exportfs(vnode_t *, fid_t *,
643 644 struct exp_visible *, struct exportdata *);
644 645 extern int vop_fid_pseudo(vnode_t *, fid_t *);
645 646 extern int nfs4_vget_pseudo(struct exportinfo *, vnode_t **, fid_t *);
646 647 /*
647 648 * Functions that handle the NFSv4 server namespace security flavors
648 649 * information.
649 650 */
650 651 extern void srv_secinfo_exp2pseu(struct exportdata *, struct exportdata *);
651 652 extern void srv_secinfo_list_free(struct secinfo *, int);
652 653
653 654 /*
654 655 * "public" and default (root) location for public filehandle
655 656 */
656 657 extern struct exportinfo *exi_public, *exi_root;
657 658 extern fhandle_t nullfh2; /* for comparing V2 filehandles */
658 659 extern krwlock_t exported_lock;
659 660 extern struct exportinfo *exptable[];
660 661
661 662 /*
662 663 * Two macros for identifying public filehandles.
663 664 * A v2 public filehandle is 32 zero bytes.
664 665 * A v3 public filehandle is zero length.
665 666 */
666 667 #define PUBLIC_FH2(fh) \
667 668 ((fh)->fh_fsid.val[1] == 0 && \
668 669 bcmp((fh), &nullfh2, sizeof (fhandle_t)) == 0)
669 670
670 671 #define PUBLIC_FH3(fh) \
671 672 ((fh)->fh3_length == 0)
672 673
673 674 extern int makefh4(nfs_fh4 *, struct vnode *, struct exportinfo *);
674 675 extern vnode_t *nfs4_fhtovp(nfs_fh4 *, struct exportinfo *, nfsstat4 *);
675 676
676 677 #endif /* _KERNEL */
677 678
678 679 #ifdef __cplusplus
679 680 }
680 681 #endif
681 682
682 683 #endif /* _NFS_EXPORT_H */
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