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-rw-r--r--fs/nfsd/export.c125
1 files changed, 88 insertions, 37 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index c591761a1ad6..2ebd77d758bc 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -258,16 +258,6 @@ static DefineSimpleCacheLookup(svc_expkey, svc_expkey)
258 258
259static struct cache_head *export_table[EXPORT_HASHMAX]; 259static struct cache_head *export_table[EXPORT_HASHMAX];
260 260
261static inline int svc_export_hash(struct svc_export *item)
262{
263 int rv;
264
265 rv = hash_ptr(item->ex_client, EXPORT_HASHBITS);
266 rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS);
267 rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS);
268 return rv;
269}
270
271void svc_export_put(struct cache_head *item, struct cache_detail *cd) 261void svc_export_put(struct cache_head *item, struct cache_detail *cd)
272{ 262{
273 if (cache_put(item, cd)) { 263 if (cache_put(item, cd)) {
@@ -298,7 +288,8 @@ static void svc_export_request(struct cache_detail *cd,
298 (*bpp)[-1] = '\n'; 288 (*bpp)[-1] = '\n';
299} 289}
300 290
301static struct svc_export *svc_export_lookup(struct svc_export *, int); 291struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old);
292static struct svc_export *svc_export_lookup(struct svc_export *);
302 293
303static int check_export(struct inode *inode, int flags) 294static int check_export(struct inode *inode, int flags)
304{ 295{
@@ -411,11 +402,16 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
411 if (err) goto out; 402 if (err) goto out;
412 } 403 }
413 404
414 expp = svc_export_lookup(&exp, 1); 405 expp = svc_export_lookup(&exp);
415 if (expp) 406 if (expp)
416 exp_put(expp); 407 expp = svc_export_update(&exp, expp);
417 err = 0; 408 else
409 err = -ENOMEM;
418 cache_flush(); 410 cache_flush();
411 if (expp == NULL)
412 err = -ENOMEM;
413 else
414 exp_put(expp);
419 out: 415 out:
420 if (nd.dentry) 416 if (nd.dentry)
421 path_release(&nd); 417 path_release(&nd);
@@ -449,40 +445,95 @@ static int svc_export_show(struct seq_file *m,
449 seq_puts(m, ")\n"); 445 seq_puts(m, ")\n");
450 return 0; 446 return 0;
451} 447}
452struct cache_detail svc_export_cache = { 448static int svc_export_match(struct cache_head *a, struct cache_head *b)
453 .owner = THIS_MODULE,
454 .hash_size = EXPORT_HASHMAX,
455 .hash_table = export_table,
456 .name = "nfsd.export",
457 .cache_put = svc_export_put,
458 .cache_request = svc_export_request,
459 .cache_parse = svc_export_parse,
460 .cache_show = svc_export_show,
461};
462
463static inline int svc_export_match(struct svc_export *a, struct svc_export *b)
464{ 449{
465 return a->ex_client == b->ex_client && 450 struct svc_export *orig = container_of(a, struct svc_export, h);
466 a->ex_dentry == b->ex_dentry && 451 struct svc_export *new = container_of(b, struct svc_export, h);
467 a->ex_mnt == b->ex_mnt; 452 return orig->ex_client == new->ex_client &&
453 orig->ex_dentry == new->ex_dentry &&
454 orig->ex_mnt == new->ex_mnt;
468} 455}
469static inline void svc_export_init(struct svc_export *new, struct svc_export *item) 456
457static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
470{ 458{
459 struct svc_export *new = container_of(cnew, struct svc_export, h);
460 struct svc_export *item = container_of(citem, struct svc_export, h);
461
471 kref_get(&item->ex_client->ref); 462 kref_get(&item->ex_client->ref);
472 new->ex_client = item->ex_client; 463 new->ex_client = item->ex_client;
473 new->ex_dentry = dget(item->ex_dentry); 464 new->ex_dentry = dget(item->ex_dentry);
474 new->ex_mnt = mntget(item->ex_mnt); 465 new->ex_mnt = mntget(item->ex_mnt);
475} 466}
476 467
477static inline void svc_export_update(struct svc_export *new, struct svc_export *item) 468static void export_update(struct cache_head *cnew, struct cache_head *citem)
478{ 469{
470 struct svc_export *new = container_of(cnew, struct svc_export, h);
471 struct svc_export *item = container_of(citem, struct svc_export, h);
472
479 new->ex_flags = item->ex_flags; 473 new->ex_flags = item->ex_flags;
480 new->ex_anon_uid = item->ex_anon_uid; 474 new->ex_anon_uid = item->ex_anon_uid;
481 new->ex_anon_gid = item->ex_anon_gid; 475 new->ex_anon_gid = item->ex_anon_gid;
482 new->ex_fsid = item->ex_fsid; 476 new->ex_fsid = item->ex_fsid;
483} 477}
484 478
485static DefineSimpleCacheLookup(svc_export, svc_export) 479static struct cache_head *svc_export_alloc(void)
480{
481 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
482 if (i)
483 return &i->h;
484 else
485 return NULL;
486}
487
488struct cache_detail svc_export_cache = {
489 .owner = THIS_MODULE,
490 .hash_size = EXPORT_HASHMAX,
491 .hash_table = export_table,
492 .name = "nfsd.export",
493 .cache_put = svc_export_put,
494 .cache_request = svc_export_request,
495 .cache_parse = svc_export_parse,
496 .cache_show = svc_export_show,
497 .match = svc_export_match,
498 .init = svc_export_init,
499 .update = export_update,
500 .alloc = svc_export_alloc,
501};
502
503static struct svc_export *
504svc_export_lookup(struct svc_export *exp)
505{
506 struct cache_head *ch;
507 int hash;
508 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
509 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
510 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
511
512 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
513 hash);
514 if (ch)
515 return container_of(ch, struct svc_export, h);
516 else
517 return NULL;
518}
519
520struct svc_export *
521svc_export_update(struct svc_export *new, struct svc_export *old)
522{
523 struct cache_head *ch;
524 int hash;
525 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
526 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
527 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
528
529 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
530 &old->h,
531 hash);
532 if (ch)
533 return container_of(ch, struct svc_export, h);
534 else
535 return NULL;
536}
486 537
487 538
488struct svc_expkey * 539struct svc_expkey *
@@ -568,7 +619,7 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
568 key.ex_mnt = mnt; 619 key.ex_mnt = mnt;
569 key.ex_dentry = dentry; 620 key.ex_dentry = dentry;
570 621
571 exp = svc_export_lookup(&key, 0); 622 exp = svc_export_lookup(&key);
572 if (exp != NULL) 623 if (exp != NULL)
573 switch (cache_check(&svc_export_cache, &exp->h, reqp)) { 624 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
574 case 0: break; 625 case 0: break;
@@ -770,13 +821,13 @@ exp_export(struct nfsctl_export *nxp)
770 new.ex_anon_gid = nxp->ex_anon_gid; 821 new.ex_anon_gid = nxp->ex_anon_gid;
771 new.ex_fsid = nxp->ex_dev; 822 new.ex_fsid = nxp->ex_dev;
772 823
773 exp = svc_export_lookup(&new, 1); 824 exp = svc_export_lookup(&new);
825 if (exp)
826 exp = svc_export_update(&new, exp);
774 827
775 if (exp == NULL) 828 if (!exp)
776 goto finish; 829 goto finish;
777 830
778 err = 0;
779
780 if (exp_hash(clp, exp) || 831 if (exp_hash(clp, exp) ||
781 exp_fsid_hash(clp, exp)) { 832 exp_fsid_hash(clp, exp)) {
782 /* failed to create at least one index */ 833 /* failed to create at least one index */