This source file includes following definitions.
- find_pnfs_driver_locked
- find_pnfs_driver
- unset_pnfs_layoutdriver
- ld_cmp
- set_pnfs_layoutdriver
- pnfs_register_layoutdriver
- pnfs_unregister_layoutdriver
- pnfs_get_layout_hdr
- pnfs_alloc_layout_hdr
- pnfs_free_layout_hdr
- pnfs_detach_layout_hdr
- pnfs_put_layout_hdr
- pnfs_set_plh_return_info
- pnfs_clear_layoutreturn_info
- pnfs_clear_layoutreturn_waitbit
- pnfs_clear_lseg_state
- nfs4_layout_refresh_old_stateid
- pnfs_mark_layout_stateid_invalid
- pnfs_iomode_to_fail_bit
- pnfs_layout_set_fail_bit
- pnfs_layout_clear_fail_bit
- pnfs_layout_io_set_failed
- pnfs_layout_io_test_failed
- pnfs_init_lseg
- pnfs_free_lseg
- pnfs_layout_remove_lseg
- pnfs_cache_lseg_for_layoutreturn
- pnfs_put_lseg
- pnfs_lseg_range_contained
- pnfs_lseg_dec_and_remove_zero
- mark_lseg_invalid
- pnfs_seqid_is_newer
- pnfs_should_free_range
- pnfs_match_lseg_recall
- pnfs_mark_matching_lsegs_invalid
- pnfs_free_returned_lsegs
- pnfs_free_lseg_list
- pnfs_destroy_layout
- pnfs_layout_add_bulk_destroy_list
- pnfs_layout_bulk_destroy_byserver_locked
- pnfs_layout_free_bulk_destroy_list
- pnfs_destroy_layouts_byfsid
- pnfs_destroy_layouts_byclid
- pnfs_destroy_all_layouts
- pnfs_set_layout_stateid
- pnfs_layout_stateid_blocked
- pnfs_layoutgets_blocked
- pnfs_find_server
- nfs4_free_pages
- nfs4_alloc_pages
- pnfs_alloc_init_layoutget_args
- pnfs_layoutget_free
- pnfs_clear_layoutcommit
- pnfs_layoutreturn_free_lsegs
- pnfs_prepare_layoutreturn
- pnfs_init_layoutreturn_args
- pnfs_send_layoutreturn
- pnfs_layout_need_return
- pnfs_layoutreturn_before_put_layout_hdr
- _pnfs_return_layout
- pnfs_commit_and_return_layout
- pnfs_roc
- pnfs_roc_done
- pnfs_roc_release
- pnfs_wait_on_layoutreturn
- pnfs_lseg_range_cmp
- pnfs_lseg_range_is_after
- pnfs_lseg_no_merge
- pnfs_generic_layout_insert_lseg
- pnfs_layout_insert_lseg
- alloc_init_layout_hdr
- pnfs_find_alloc_layout
- pnfs_lseg_range_match
- pnfs_find_lseg
- pnfs_within_mdsthreshold
- pnfs_prepare_to_retry_layoutget
- nfs_layoutget_begin
- nfs_layoutget_end
- pnfs_clear_first_layoutget
- _add_to_server_list
- pnfs_update_layout
- pnfs_sanity_check_layout_range
- _pnfs_grab_empty_layout
- _lgopen_prepare_attached
- _lgopen_prepare_floating
- pnfs_lgopen_prepare
- pnfs_parse_lgopen
- nfs4_lgopen_release
- pnfs_layout_process
- mark_lseg_invalid_or_return
- pnfs_mark_matching_lsegs_return
- pnfs_error_mark_layout_for_return
- pnfs_generic_pg_check_layout
- pnfs_generic_pg_check_range
- pnfs_generic_pg_init_read
- pnfs_generic_pg_init_write
- pnfs_generic_pg_cleanup
- pnfs_generic_pg_test
- pnfs_write_done_resend_to_mds
- pnfs_ld_handle_write_error
- pnfs_ld_write_done
- pnfs_write_through_mds
- pnfs_try_to_write_data
- pnfs_do_write
- pnfs_writehdr_free
- pnfs_generic_pg_writepages
- pnfs_read_done_resend_to_mds
- pnfs_ld_handle_read_error
- pnfs_ld_read_done
- pnfs_read_through_mds
- pnfs_try_to_read_data
- pnfs_read_resend_pnfs
- pnfs_do_read
- pnfs_readhdr_free
- pnfs_generic_pg_readpages
- pnfs_clear_layoutcommitting
- pnfs_list_write_lseg
- pnfs_list_write_lseg_done
- pnfs_set_lo_fail
- pnfs_set_layoutcommit
- pnfs_cleanup_layoutcommit
- pnfs_layoutcommit_inode
- pnfs_generic_sync
- pnfs_mdsthreshold_alloc
- pnfs_report_layoutstat
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30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_page.h>
32 #include <linux/module.h>
33 #include <linux/sort.h>
34 #include "internal.h"
35 #include "pnfs.h"
36 #include "iostat.h"
37 #include "nfs4trace.h"
38 #include "delegation.h"
39 #include "nfs42.h"
40 #include "nfs4_fs.h"
41
42 #define NFSDBG_FACILITY NFSDBG_PNFS
43 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
44
45
46
47
48
49
50 static DEFINE_SPINLOCK(pnfs_spinlock);
51
52
53
54
55 static LIST_HEAD(pnfs_modules_tbl);
56
57 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
58 static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
61 u32 seq);
62 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
64
65
66 static struct pnfs_layoutdriver_type *
67 find_pnfs_driver_locked(u32 id)
68 {
69 struct pnfs_layoutdriver_type *local;
70
71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
72 if (local->id == id)
73 goto out;
74 local = NULL;
75 out:
76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
77 return local;
78 }
79
80 static struct pnfs_layoutdriver_type *
81 find_pnfs_driver(u32 id)
82 {
83 struct pnfs_layoutdriver_type *local;
84
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
89 local = NULL;
90 }
91 spin_unlock(&pnfs_spinlock);
92 return local;
93 }
94
95 void
96 unset_pnfs_layoutdriver(struct nfs_server *nfss)
97 {
98 if (nfss->pnfs_curr_ld) {
99 if (nfss->pnfs_curr_ld->clear_layoutdriver)
100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
101
102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
103 nfs4_deviceid_purge_client(nfss->nfs_client);
104 module_put(nfss->pnfs_curr_ld->owner);
105 }
106 nfss->pnfs_curr_ld = NULL;
107 }
108
109
110
111
112
113
114
115
116 static const u32 ld_prefs[] = {
117 LAYOUT_SCSI,
118 LAYOUT_BLOCK_VOLUME,
119 LAYOUT_OSD2_OBJECTS,
120 LAYOUT_FLEX_FILES,
121 LAYOUT_NFSV4_1_FILES,
122 0
123 };
124
125 static int
126 ld_cmp(const void *e1, const void *e2)
127 {
128 u32 ld1 = *((u32 *)e1);
129 u32 ld2 = *((u32 *)e2);
130 int i;
131
132 for (i = 0; ld_prefs[i] != 0; i++) {
133 if (ld1 == ld_prefs[i])
134 return -1;
135
136 if (ld2 == ld_prefs[i])
137 return 1;
138 }
139 return 0;
140 }
141
142
143
144
145
146
147
148 void
149 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
150 struct nfs_fsinfo *fsinfo)
151 {
152 struct pnfs_layoutdriver_type *ld_type = NULL;
153 u32 id;
154 int i;
155
156 if (fsinfo->nlayouttypes == 0)
157 goto out_no_driver;
158 if (!(server->nfs_client->cl_exchange_flags &
159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
161 __func__, server->nfs_client->cl_exchange_flags);
162 goto out_no_driver;
163 }
164
165 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
166 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
167
168 for (i = 0; i < fsinfo->nlayouttypes; i++) {
169 id = fsinfo->layouttype[i];
170 ld_type = find_pnfs_driver(id);
171 if (!ld_type) {
172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
173 id);
174 ld_type = find_pnfs_driver(id);
175 }
176 if (ld_type)
177 break;
178 }
179
180 if (!ld_type) {
181 dprintk("%s: No pNFS module found!\n", __func__);
182 goto out_no_driver;
183 }
184
185 server->pnfs_curr_ld = ld_type;
186 if (ld_type->set_layoutdriver
187 && ld_type->set_layoutdriver(server, mntfh)) {
188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
189 "driver %u.\n", __func__, id);
190 module_put(ld_type->owner);
191 goto out_no_driver;
192 }
193
194 atomic_inc(&server->nfs_client->cl_mds_count);
195
196 dprintk("%s: pNFS module for %u set\n", __func__, id);
197 return;
198
199 out_no_driver:
200 dprintk("%s: Using NFSv4 I/O\n", __func__);
201 server->pnfs_curr_ld = NULL;
202 }
203
204 int
205 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
206 {
207 int status = -EINVAL;
208 struct pnfs_layoutdriver_type *tmp;
209
210 if (ld_type->id == 0) {
211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
212 return status;
213 }
214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
215 printk(KERN_ERR "NFS: %s Layout driver must provide "
216 "alloc_lseg and free_lseg.\n", __func__);
217 return status;
218 }
219
220 spin_lock(&pnfs_spinlock);
221 tmp = find_pnfs_driver_locked(ld_type->id);
222 if (!tmp) {
223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
224 status = 0;
225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
226 ld_type->name);
227 } else {
228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
229 __func__, ld_type->id);
230 }
231 spin_unlock(&pnfs_spinlock);
232
233 return status;
234 }
235 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
236
237 void
238 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
239 {
240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
241 spin_lock(&pnfs_spinlock);
242 list_del(&ld_type->pnfs_tblid);
243 spin_unlock(&pnfs_spinlock);
244 }
245 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
246
247
248
249
250
251
252 void
253 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
254 {
255 refcount_inc(&lo->plh_refcount);
256 }
257
258 static struct pnfs_layout_hdr *
259 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
260 {
261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
262 return ld->alloc_layout_hdr(ino, gfp_flags);
263 }
264
265 static void
266 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
267 {
268 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
270
271 if (!list_empty(&lo->plh_layouts)) {
272 struct nfs_client *clp = server->nfs_client;
273
274 spin_lock(&clp->cl_lock);
275 list_del_init(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
277 }
278 put_cred(lo->plh_lc_cred);
279 return ld->free_layout_hdr(lo);
280 }
281
282 static void
283 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
284 {
285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
286 dprintk("%s: freeing layout cache %p\n", __func__, lo);
287 nfsi->layout = NULL;
288
289 nfsi->write_io = 0;
290 nfsi->read_io = 0;
291 }
292
293 void
294 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
295 {
296 struct inode *inode;
297
298 if (!lo)
299 return;
300 inode = lo->plh_inode;
301 pnfs_layoutreturn_before_put_layout_hdr(lo);
302
303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
304 if (!list_empty(&lo->plh_segs))
305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
306 pnfs_detach_layout_hdr(lo);
307 spin_unlock(&inode->i_lock);
308 pnfs_free_layout_hdr(lo);
309 }
310 }
311
312 static void
313 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
314 u32 seq)
315 {
316 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
317 iomode = IOMODE_ANY;
318 lo->plh_return_iomode = iomode;
319 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
320 if (seq != 0) {
321 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
322 lo->plh_return_seq = seq;
323 }
324 }
325
326 static void
327 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
328 {
329 struct pnfs_layout_segment *lseg;
330 lo->plh_return_iomode = 0;
331 lo->plh_return_seq = 0;
332 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
333 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
334 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
335 continue;
336 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
337 }
338 }
339
340 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
341 {
342 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
343 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
344 smp_mb__after_atomic();
345 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
346 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
347 }
348
349 static void
350 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
351 struct list_head *free_me)
352 {
353 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
354 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
355 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
356 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
357 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
358 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
359 }
360
361
362
363
364
365 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
366 struct pnfs_layout_range *dst_range,
367 struct inode *inode)
368 {
369 struct pnfs_layout_hdr *lo;
370 struct pnfs_layout_range range = {
371 .iomode = IOMODE_ANY,
372 .offset = 0,
373 .length = NFS4_MAX_UINT64,
374 };
375 bool ret = false;
376 LIST_HEAD(head);
377 int err;
378
379 spin_lock(&inode->i_lock);
380 lo = NFS_I(inode)->layout;
381 if (lo && pnfs_layout_is_valid(lo) &&
382 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
383
384 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
385 nfs4_stateid_seqid_inc(dst);
386 ret = true;
387 goto out;
388 }
389
390 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
391 if (err != -EBUSY) {
392 dst->seqid = lo->plh_stateid.seqid;
393 *dst_range = range;
394 ret = true;
395 }
396 }
397 out:
398 spin_unlock(&inode->i_lock);
399 pnfs_free_lseg_list(&head);
400 return ret;
401 }
402
403
404
405
406
407
408
409
410 int
411 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
412 struct list_head *lseg_list)
413 {
414 struct pnfs_layout_range range = {
415 .iomode = IOMODE_ANY,
416 .offset = 0,
417 .length = NFS4_MAX_UINT64,
418 };
419 struct pnfs_layout_segment *lseg, *next;
420
421 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
422 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
423 pnfs_clear_lseg_state(lseg, lseg_list);
424 pnfs_clear_layoutreturn_info(lo);
425 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
426 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
427 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
428 pnfs_clear_layoutreturn_waitbit(lo);
429 return !list_empty(&lo->plh_segs);
430 }
431
432 static int
433 pnfs_iomode_to_fail_bit(u32 iomode)
434 {
435 return iomode == IOMODE_RW ?
436 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
437 }
438
439 static void
440 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
441 {
442 lo->plh_retry_timestamp = jiffies;
443 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
444 refcount_inc(&lo->plh_refcount);
445 }
446
447 static void
448 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
449 {
450 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
451 refcount_dec(&lo->plh_refcount);
452 }
453
454 static void
455 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
456 {
457 struct inode *inode = lo->plh_inode;
458 struct pnfs_layout_range range = {
459 .iomode = iomode,
460 .offset = 0,
461 .length = NFS4_MAX_UINT64,
462 };
463 LIST_HEAD(head);
464
465 spin_lock(&inode->i_lock);
466 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
467 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
468 spin_unlock(&inode->i_lock);
469 pnfs_free_lseg_list(&head);
470 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
471 iomode == IOMODE_RW ? "RW" : "READ");
472 }
473
474 static bool
475 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
476 {
477 unsigned long start, end;
478 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
479
480 if (test_bit(fail_bit, &lo->plh_flags) == 0)
481 return false;
482 end = jiffies;
483 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
484 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
485
486 pnfs_layout_clear_fail_bit(lo, fail_bit);
487 return false;
488 }
489 return true;
490 }
491
492 static void
493 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
494 const struct pnfs_layout_range *range,
495 const nfs4_stateid *stateid)
496 {
497 INIT_LIST_HEAD(&lseg->pls_list);
498 INIT_LIST_HEAD(&lseg->pls_lc_list);
499 refcount_set(&lseg->pls_refcount, 1);
500 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
501 lseg->pls_layout = lo;
502 lseg->pls_range = *range;
503 lseg->pls_seq = be32_to_cpu(stateid->seqid);
504 }
505
506 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
507 {
508 if (lseg != NULL) {
509 struct inode *inode = lseg->pls_layout->plh_inode;
510 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
511 }
512 }
513
514 static void
515 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
516 struct pnfs_layout_segment *lseg)
517 {
518 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
519 list_del_init(&lseg->pls_list);
520
521 refcount_dec(&lo->plh_refcount);
522 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
523 return;
524 if (list_empty(&lo->plh_segs) &&
525 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
526 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
527 if (atomic_read(&lo->plh_outstanding) == 0)
528 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
529 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
530 }
531 }
532
533 static bool
534 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
535 struct pnfs_layout_segment *lseg)
536 {
537 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
538 pnfs_layout_is_valid(lo)) {
539 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
540 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
541 return true;
542 }
543 return false;
544 }
545
546 void
547 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
548 {
549 struct pnfs_layout_hdr *lo;
550 struct inode *inode;
551
552 if (!lseg)
553 return;
554
555 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
556 refcount_read(&lseg->pls_refcount),
557 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
558
559 lo = lseg->pls_layout;
560 inode = lo->plh_inode;
561
562 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
563 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
564 spin_unlock(&inode->i_lock);
565 return;
566 }
567 pnfs_get_layout_hdr(lo);
568 pnfs_layout_remove_lseg(lo, lseg);
569 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
570 lseg = NULL;
571 spin_unlock(&inode->i_lock);
572 pnfs_free_lseg(lseg);
573 pnfs_put_layout_hdr(lo);
574 }
575 }
576 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
577
578
579
580
581
582
583
584
585 static bool
586 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
587 const struct pnfs_layout_range *l2)
588 {
589 u64 start1 = l1->offset;
590 u64 end1 = pnfs_end_offset(start1, l1->length);
591 u64 start2 = l2->offset;
592 u64 end2 = pnfs_end_offset(start2, l2->length);
593
594 return (start1 <= start2) && (end1 >= end2);
595 }
596
597 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
598 struct list_head *tmp_list)
599 {
600 if (!refcount_dec_and_test(&lseg->pls_refcount))
601 return false;
602 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
603 list_add(&lseg->pls_list, tmp_list);
604 return true;
605 }
606
607
608 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
609 struct list_head *tmp_list)
610 {
611 int rv = 0;
612
613 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
614
615
616
617
618 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
619 refcount_read(&lseg->pls_refcount));
620 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
621 rv = 1;
622 }
623 return rv;
624 }
625
626
627
628
629
630 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
631 {
632 return (s32)(s1 - s2) > 0;
633 }
634
635 static bool
636 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
637 const struct pnfs_layout_range *recall_range)
638 {
639 return (recall_range->iomode == IOMODE_ANY ||
640 lseg_range->iomode == recall_range->iomode) &&
641 pnfs_lseg_range_intersecting(lseg_range, recall_range);
642 }
643
644 static bool
645 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
646 const struct pnfs_layout_range *recall_range,
647 u32 seq)
648 {
649 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
650 return false;
651 if (recall_range == NULL)
652 return true;
653 return pnfs_should_free_range(&lseg->pls_range, recall_range);
654 }
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671 int
672 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
673 struct list_head *tmp_list,
674 const struct pnfs_layout_range *recall_range,
675 u32 seq)
676 {
677 struct pnfs_layout_segment *lseg, *next;
678 int remaining = 0;
679
680 dprintk("%s:Begin lo %p\n", __func__, lo);
681
682 if (list_empty(&lo->plh_segs))
683 return 0;
684 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
685 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
686 dprintk("%s: freeing lseg %p iomode %d seq %u "
687 "offset %llu length %llu\n", __func__,
688 lseg, lseg->pls_range.iomode, lseg->pls_seq,
689 lseg->pls_range.offset, lseg->pls_range.length);
690 if (!mark_lseg_invalid(lseg, tmp_list))
691 remaining++;
692 }
693 dprintk("%s:Return %i\n", __func__, remaining);
694 return remaining;
695 }
696
697 static void
698 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
699 struct list_head *free_me,
700 const struct pnfs_layout_range *range,
701 u32 seq)
702 {
703 struct pnfs_layout_segment *lseg, *next;
704
705 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
706 if (pnfs_match_lseg_recall(lseg, range, seq))
707 list_move_tail(&lseg->pls_list, free_me);
708 }
709 }
710
711
712 void
713 pnfs_free_lseg_list(struct list_head *free_me)
714 {
715 struct pnfs_layout_segment *lseg, *tmp;
716
717 if (list_empty(free_me))
718 return;
719
720 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
721 list_del(&lseg->pls_list);
722 pnfs_free_lseg(lseg);
723 }
724 }
725
726 void
727 pnfs_destroy_layout(struct nfs_inode *nfsi)
728 {
729 struct pnfs_layout_hdr *lo;
730 LIST_HEAD(tmp_list);
731
732 spin_lock(&nfsi->vfs_inode.i_lock);
733 lo = nfsi->layout;
734 if (lo) {
735 pnfs_get_layout_hdr(lo);
736 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
737 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
738 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
739 spin_unlock(&nfsi->vfs_inode.i_lock);
740 pnfs_free_lseg_list(&tmp_list);
741 nfs_commit_inode(&nfsi->vfs_inode, 0);
742 pnfs_put_layout_hdr(lo);
743 } else
744 spin_unlock(&nfsi->vfs_inode.i_lock);
745 }
746 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
747
748 static bool
749 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
750 struct list_head *layout_list)
751 {
752 struct pnfs_layout_hdr *lo;
753 bool ret = false;
754
755 spin_lock(&inode->i_lock);
756 lo = NFS_I(inode)->layout;
757 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
758 pnfs_get_layout_hdr(lo);
759 list_add(&lo->plh_bulk_destroy, layout_list);
760 ret = true;
761 }
762 spin_unlock(&inode->i_lock);
763 return ret;
764 }
765
766
767 static int
768 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
769 struct nfs_server *server,
770 struct list_head *layout_list)
771 __must_hold(&clp->cl_lock)
772 __must_hold(RCU)
773 {
774 struct pnfs_layout_hdr *lo, *next;
775 struct inode *inode;
776
777 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
778 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
779 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
780 !list_empty(&lo->plh_bulk_destroy))
781 continue;
782
783 if (!nfs_sb_active(server->super))
784 break;
785 inode = igrab(lo->plh_inode);
786 if (inode != NULL) {
787 list_del_init(&lo->plh_layouts);
788 if (pnfs_layout_add_bulk_destroy_list(inode,
789 layout_list))
790 continue;
791 rcu_read_unlock();
792 spin_unlock(&clp->cl_lock);
793 iput(inode);
794 } else {
795 rcu_read_unlock();
796 spin_unlock(&clp->cl_lock);
797 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
798 }
799 nfs_sb_deactive(server->super);
800 spin_lock(&clp->cl_lock);
801 rcu_read_lock();
802 return -EAGAIN;
803 }
804 return 0;
805 }
806
807 static int
808 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
809 bool is_bulk_recall)
810 {
811 struct pnfs_layout_hdr *lo;
812 struct inode *inode;
813 LIST_HEAD(lseg_list);
814 int ret = 0;
815
816 while (!list_empty(layout_list)) {
817 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
818 plh_bulk_destroy);
819 dprintk("%s freeing layout for inode %lu\n", __func__,
820 lo->plh_inode->i_ino);
821 inode = lo->plh_inode;
822
823 pnfs_layoutcommit_inode(inode, false);
824
825 spin_lock(&inode->i_lock);
826 list_del_init(&lo->plh_bulk_destroy);
827 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
828 if (is_bulk_recall)
829 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
830 ret = -EAGAIN;
831 }
832 spin_unlock(&inode->i_lock);
833 pnfs_free_lseg_list(&lseg_list);
834
835 nfs_commit_inode(inode, 0);
836 pnfs_put_layout_hdr(lo);
837 nfs_iput_and_deactive(inode);
838 }
839 return ret;
840 }
841
842 int
843 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
844 struct nfs_fsid *fsid,
845 bool is_recall)
846 {
847 struct nfs_server *server;
848 LIST_HEAD(layout_list);
849
850 spin_lock(&clp->cl_lock);
851 rcu_read_lock();
852 restart:
853 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
854 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
855 continue;
856 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
857 server,
858 &layout_list) != 0)
859 goto restart;
860 }
861 rcu_read_unlock();
862 spin_unlock(&clp->cl_lock);
863
864 if (list_empty(&layout_list))
865 return 0;
866 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
867 }
868
869 int
870 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
871 bool is_recall)
872 {
873 struct nfs_server *server;
874 LIST_HEAD(layout_list);
875
876 spin_lock(&clp->cl_lock);
877 rcu_read_lock();
878 restart:
879 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
880 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
881 server,
882 &layout_list) != 0)
883 goto restart;
884 }
885 rcu_read_unlock();
886 spin_unlock(&clp->cl_lock);
887
888 if (list_empty(&layout_list))
889 return 0;
890 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
891 }
892
893
894
895
896
897 void
898 pnfs_destroy_all_layouts(struct nfs_client *clp)
899 {
900 nfs4_deviceid_mark_client_invalid(clp);
901 nfs4_deviceid_purge_client(clp);
902
903 pnfs_destroy_layouts_byclid(clp, false);
904 }
905
906
907 void
908 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
909 bool update_barrier)
910 {
911 u32 oldseq, newseq, new_barrier = 0;
912
913 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
914 newseq = be32_to_cpu(new->seqid);
915
916 if (!pnfs_layout_is_valid(lo)) {
917 nfs4_stateid_copy(&lo->plh_stateid, new);
918 lo->plh_barrier = newseq;
919 pnfs_clear_layoutreturn_info(lo);
920 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
921 return;
922 }
923 if (pnfs_seqid_is_newer(newseq, oldseq)) {
924 nfs4_stateid_copy(&lo->plh_stateid, new);
925
926
927
928
929 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
930 }
931 if (update_barrier)
932 new_barrier = be32_to_cpu(new->seqid);
933 else if (new_barrier == 0)
934 return;
935 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
936 lo->plh_barrier = new_barrier;
937 }
938
939 static bool
940 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
941 const nfs4_stateid *stateid)
942 {
943 u32 seqid = be32_to_cpu(stateid->seqid);
944
945 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
946 }
947
948
949 static bool
950 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
951 {
952 return lo->plh_block_lgets ||
953 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
954 }
955
956 static struct nfs_server *
957 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
958 {
959 struct nfs_server *server;
960
961 if (inode) {
962 server = NFS_SERVER(inode);
963 } else {
964 struct dentry *parent_dir = dget_parent(ctx->dentry);
965 server = NFS_SERVER(parent_dir->d_inode);
966 dput(parent_dir);
967 }
968 return server;
969 }
970
971 static void nfs4_free_pages(struct page **pages, size_t size)
972 {
973 int i;
974
975 if (!pages)
976 return;
977
978 for (i = 0; i < size; i++) {
979 if (!pages[i])
980 break;
981 __free_page(pages[i]);
982 }
983 kfree(pages);
984 }
985
986 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
987 {
988 struct page **pages;
989 int i;
990
991 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
992 if (!pages) {
993 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
994 return NULL;
995 }
996
997 for (i = 0; i < size; i++) {
998 pages[i] = alloc_page(gfp_flags);
999 if (!pages[i]) {
1000 dprintk("%s: failed to allocate page\n", __func__);
1001 nfs4_free_pages(pages, i);
1002 return NULL;
1003 }
1004 }
1005
1006 return pages;
1007 }
1008
1009 static struct nfs4_layoutget *
1010 pnfs_alloc_init_layoutget_args(struct inode *ino,
1011 struct nfs_open_context *ctx,
1012 const nfs4_stateid *stateid,
1013 const struct pnfs_layout_range *range,
1014 gfp_t gfp_flags)
1015 {
1016 struct nfs_server *server = pnfs_find_server(ino, ctx);
1017 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1018 size_t max_pages = max_response_pages(server);
1019 struct nfs4_layoutget *lgp;
1020
1021 dprintk("--> %s\n", __func__);
1022
1023 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1024 if (lgp == NULL)
1025 return NULL;
1026
1027 if (max_reply_sz) {
1028 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1029 if (npages < max_pages)
1030 max_pages = npages;
1031 }
1032
1033 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1034 if (!lgp->args.layout.pages) {
1035 kfree(lgp);
1036 return NULL;
1037 }
1038 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1039 lgp->res.layoutp = &lgp->args.layout;
1040
1041
1042 lgp->res.status = -NFS4ERR_DELAY;
1043
1044 lgp->args.minlength = PAGE_SIZE;
1045 if (lgp->args.minlength > range->length)
1046 lgp->args.minlength = range->length;
1047 if (ino) {
1048 loff_t i_size = i_size_read(ino);
1049
1050 if (range->iomode == IOMODE_READ) {
1051 if (range->offset >= i_size)
1052 lgp->args.minlength = 0;
1053 else if (i_size - range->offset < lgp->args.minlength)
1054 lgp->args.minlength = i_size - range->offset;
1055 }
1056 }
1057 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1058 pnfs_copy_range(&lgp->args.range, range);
1059 lgp->args.type = server->pnfs_curr_ld->id;
1060 lgp->args.inode = ino;
1061 lgp->args.ctx = get_nfs_open_context(ctx);
1062 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1063 lgp->gfp_flags = gfp_flags;
1064 lgp->cred = get_cred(ctx->cred);
1065 return lgp;
1066 }
1067
1068 void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1069 {
1070 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1071
1072 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1073 if (lgp->args.inode)
1074 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1075 put_cred(lgp->cred);
1076 put_nfs_open_context(lgp->args.ctx);
1077 kfree(lgp);
1078 }
1079
1080 static void pnfs_clear_layoutcommit(struct inode *inode,
1081 struct list_head *head)
1082 {
1083 struct nfs_inode *nfsi = NFS_I(inode);
1084 struct pnfs_layout_segment *lseg, *tmp;
1085
1086 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1087 return;
1088 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1089 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1090 continue;
1091 pnfs_lseg_dec_and_remove_zero(lseg, head);
1092 }
1093 }
1094
1095 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1096 const nfs4_stateid *arg_stateid,
1097 const struct pnfs_layout_range *range,
1098 const nfs4_stateid *stateid)
1099 {
1100 struct inode *inode = lo->plh_inode;
1101 LIST_HEAD(freeme);
1102
1103 spin_lock(&inode->i_lock);
1104 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1105 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1106 goto out_unlock;
1107 if (stateid) {
1108 u32 seq = be32_to_cpu(arg_stateid->seqid);
1109
1110 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1111 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1112 pnfs_set_layout_stateid(lo, stateid, true);
1113 } else
1114 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1115 out_unlock:
1116 pnfs_clear_layoutreturn_waitbit(lo);
1117 spin_unlock(&inode->i_lock);
1118 pnfs_free_lseg_list(&freeme);
1119
1120 }
1121
1122 static bool
1123 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1124 nfs4_stateid *stateid,
1125 enum pnfs_iomode *iomode)
1126 {
1127
1128 if (atomic_read(&lo->plh_outstanding) != 0)
1129 return false;
1130 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1131 return false;
1132 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1133 pnfs_get_layout_hdr(lo);
1134 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1135 if (stateid != NULL) {
1136 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1137 if (lo->plh_return_seq != 0)
1138 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1139 }
1140 if (iomode != NULL)
1141 *iomode = lo->plh_return_iomode;
1142 pnfs_clear_layoutreturn_info(lo);
1143 return true;
1144 }
1145 if (stateid != NULL)
1146 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1147 if (iomode != NULL)
1148 *iomode = IOMODE_ANY;
1149 return true;
1150 }
1151
1152 static void
1153 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1154 struct pnfs_layout_hdr *lo,
1155 const nfs4_stateid *stateid,
1156 enum pnfs_iomode iomode)
1157 {
1158 struct inode *inode = lo->plh_inode;
1159
1160 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1161 args->inode = inode;
1162 args->range.iomode = iomode;
1163 args->range.offset = 0;
1164 args->range.length = NFS4_MAX_UINT64;
1165 args->layout = lo;
1166 nfs4_stateid_copy(&args->stateid, stateid);
1167 }
1168
1169 static int
1170 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1171 enum pnfs_iomode iomode, bool sync)
1172 {
1173 struct inode *ino = lo->plh_inode;
1174 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1175 struct nfs4_layoutreturn *lrp;
1176 int status = 0;
1177
1178 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1179 if (unlikely(lrp == NULL)) {
1180 status = -ENOMEM;
1181 spin_lock(&ino->i_lock);
1182 pnfs_clear_layoutreturn_waitbit(lo);
1183 spin_unlock(&ino->i_lock);
1184 pnfs_put_layout_hdr(lo);
1185 goto out;
1186 }
1187
1188 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1189 lrp->args.ld_private = &lrp->ld_private;
1190 lrp->clp = NFS_SERVER(ino)->nfs_client;
1191 lrp->cred = lo->plh_lc_cred;
1192 if (ld->prepare_layoutreturn)
1193 ld->prepare_layoutreturn(&lrp->args);
1194
1195 status = nfs4_proc_layoutreturn(lrp, sync);
1196 out:
1197 dprintk("<-- %s status: %d\n", __func__, status);
1198 return status;
1199 }
1200
1201
1202 static bool
1203 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1204 {
1205 struct pnfs_layout_segment *s;
1206 enum pnfs_iomode iomode;
1207 u32 seq;
1208
1209 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1210 return false;
1211
1212 seq = lo->plh_return_seq;
1213 iomode = lo->plh_return_iomode;
1214
1215
1216 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1217 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq))
1218 continue;
1219 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode)
1220 continue;
1221 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1222 return false;
1223 }
1224
1225 return true;
1226 }
1227
1228 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1229 {
1230 struct inode *inode= lo->plh_inode;
1231
1232 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1233 return;
1234 spin_lock(&inode->i_lock);
1235 if (pnfs_layout_need_return(lo)) {
1236 nfs4_stateid stateid;
1237 enum pnfs_iomode iomode;
1238 bool send;
1239
1240 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1241 spin_unlock(&inode->i_lock);
1242 if (send) {
1243
1244 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1245 }
1246 } else
1247 spin_unlock(&inode->i_lock);
1248 }
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258 int
1259 _pnfs_return_layout(struct inode *ino)
1260 {
1261 struct pnfs_layout_hdr *lo = NULL;
1262 struct nfs_inode *nfsi = NFS_I(ino);
1263 LIST_HEAD(tmp_list);
1264 nfs4_stateid stateid;
1265 int status = 0;
1266 bool send, valid_layout;
1267
1268 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1269
1270 spin_lock(&ino->i_lock);
1271 lo = nfsi->layout;
1272 if (!lo) {
1273 spin_unlock(&ino->i_lock);
1274 dprintk("NFS: %s no layout to return\n", __func__);
1275 goto out;
1276 }
1277
1278 pnfs_get_layout_hdr(lo);
1279
1280 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1281 spin_unlock(&ino->i_lock);
1282 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1283 TASK_UNINTERRUPTIBLE))
1284 goto out_put_layout_hdr;
1285 spin_lock(&ino->i_lock);
1286 }
1287 valid_layout = pnfs_layout_is_valid(lo);
1288 pnfs_clear_layoutcommit(ino, &tmp_list);
1289 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1290
1291 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1292 struct pnfs_layout_range range = {
1293 .iomode = IOMODE_ANY,
1294 .offset = 0,
1295 .length = NFS4_MAX_UINT64,
1296 };
1297 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1298 }
1299
1300
1301 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1302 !valid_layout) {
1303 spin_unlock(&ino->i_lock);
1304 dprintk("NFS: %s no layout segments to return\n", __func__);
1305 goto out_put_layout_hdr;
1306 }
1307
1308 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1309 spin_unlock(&ino->i_lock);
1310 if (send)
1311 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1312 out_put_layout_hdr:
1313 pnfs_free_lseg_list(&tmp_list);
1314 pnfs_put_layout_hdr(lo);
1315 out:
1316 dprintk("<-- %s status: %d\n", __func__, status);
1317 return status;
1318 }
1319
1320 int
1321 pnfs_commit_and_return_layout(struct inode *inode)
1322 {
1323 struct pnfs_layout_hdr *lo;
1324 int ret;
1325
1326 spin_lock(&inode->i_lock);
1327 lo = NFS_I(inode)->layout;
1328 if (lo == NULL) {
1329 spin_unlock(&inode->i_lock);
1330 return 0;
1331 }
1332 pnfs_get_layout_hdr(lo);
1333
1334 lo->plh_block_lgets++;
1335 spin_unlock(&inode->i_lock);
1336 filemap_fdatawait(inode->i_mapping);
1337 ret = pnfs_layoutcommit_inode(inode, true);
1338 if (ret == 0)
1339 ret = _pnfs_return_layout(inode);
1340 spin_lock(&inode->i_lock);
1341 lo->plh_block_lgets--;
1342 spin_unlock(&inode->i_lock);
1343 pnfs_put_layout_hdr(lo);
1344 return ret;
1345 }
1346
1347 bool pnfs_roc(struct inode *ino,
1348 struct nfs4_layoutreturn_args *args,
1349 struct nfs4_layoutreturn_res *res,
1350 const struct cred *cred)
1351 {
1352 struct nfs_inode *nfsi = NFS_I(ino);
1353 struct nfs_open_context *ctx;
1354 struct nfs4_state *state;
1355 struct pnfs_layout_hdr *lo;
1356 struct pnfs_layout_segment *lseg, *next;
1357 nfs4_stateid stateid;
1358 enum pnfs_iomode iomode = 0;
1359 bool layoutreturn = false, roc = false;
1360 bool skip_read = false;
1361
1362 if (!nfs_have_layout(ino))
1363 return false;
1364 retry:
1365 rcu_read_lock();
1366 spin_lock(&ino->i_lock);
1367 lo = nfsi->layout;
1368 if (!lo || !pnfs_layout_is_valid(lo) ||
1369 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1370 lo = NULL;
1371 goto out_noroc;
1372 }
1373 pnfs_get_layout_hdr(lo);
1374 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1375 spin_unlock(&ino->i_lock);
1376 rcu_read_unlock();
1377 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1378 TASK_UNINTERRUPTIBLE);
1379 pnfs_put_layout_hdr(lo);
1380 goto retry;
1381 }
1382
1383
1384 if (nfs4_check_delegation(ino, FMODE_READ)) {
1385 if (nfs4_check_delegation(ino, FMODE_WRITE))
1386 goto out_noroc;
1387 skip_read = true;
1388 }
1389
1390 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1391 state = ctx->state;
1392 if (state == NULL)
1393 continue;
1394
1395 if (state->state & FMODE_WRITE)
1396 goto out_noroc;
1397 if (state->state & FMODE_READ)
1398 skip_read = true;
1399 }
1400
1401
1402 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1403 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1404 continue;
1405
1406 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1407 continue;
1408
1409
1410
1411
1412 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1413 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1414 continue;
1415 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1416 }
1417
1418 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1419 goto out_noroc;
1420
1421
1422
1423
1424
1425
1426 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1427
1428 if (!layoutreturn || cred_fscmp(cred, lo->plh_lc_cred) != 0)
1429 goto out_noroc;
1430
1431 roc = layoutreturn;
1432 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1433 res->lrs_present = 0;
1434 layoutreturn = false;
1435
1436 out_noroc:
1437 spin_unlock(&ino->i_lock);
1438 rcu_read_unlock();
1439 pnfs_layoutcommit_inode(ino, true);
1440 if (roc) {
1441 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1442 if (ld->prepare_layoutreturn)
1443 ld->prepare_layoutreturn(args);
1444 pnfs_put_layout_hdr(lo);
1445 return true;
1446 }
1447 if (layoutreturn)
1448 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1449 pnfs_put_layout_hdr(lo);
1450 return false;
1451 }
1452
1453 int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
1454 struct nfs4_layoutreturn_args **argpp,
1455 struct nfs4_layoutreturn_res **respp,
1456 int *ret)
1457 {
1458 struct nfs4_layoutreturn_args *arg = *argpp;
1459 int retval = -EAGAIN;
1460
1461 if (!arg)
1462 return 0;
1463
1464 switch (*ret) {
1465 case 0:
1466 retval = 0;
1467 break;
1468 case -NFS4ERR_NOMATCHING_LAYOUT:
1469
1470 if (task->tk_rpc_status == 0)
1471 break;
1472
1473 if (!RPC_WAS_SENT(task))
1474 return 0;
1475
1476
1477
1478
1479 *ret = 0;
1480 (*respp)->lrs_present = 0;
1481 retval = 0;
1482 break;
1483 case -NFS4ERR_DELAY:
1484
1485 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1486 return 0;
1487 case -NFS4ERR_OLD_STATEID:
1488 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1489 &arg->range, inode))
1490 break;
1491 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1492 return -EAGAIN;
1493 }
1494 *argpp = NULL;
1495 *respp = NULL;
1496 return retval;
1497 }
1498
1499 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1500 struct nfs4_layoutreturn_res *res,
1501 int ret)
1502 {
1503 struct pnfs_layout_hdr *lo = args->layout;
1504 const nfs4_stateid *arg_stateid = NULL;
1505 const nfs4_stateid *res_stateid = NULL;
1506 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1507
1508 switch (ret) {
1509 case -NFS4ERR_NOMATCHING_LAYOUT:
1510 break;
1511 case 0:
1512 if (res->lrs_present)
1513 res_stateid = &res->stateid;
1514
1515 default:
1516 arg_stateid = &args->stateid;
1517 }
1518 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1519 res_stateid);
1520 if (ld_private && ld_private->ops && ld_private->ops->free)
1521 ld_private->ops->free(ld_private);
1522 pnfs_put_layout_hdr(lo);
1523 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1524 }
1525
1526 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1527 {
1528 struct nfs_inode *nfsi = NFS_I(ino);
1529 struct pnfs_layout_hdr *lo;
1530 bool sleep = false;
1531
1532
1533
1534 spin_lock(&ino->i_lock);
1535 lo = nfsi->layout;
1536 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1537 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1538 sleep = true;
1539 }
1540 spin_unlock(&ino->i_lock);
1541 return sleep;
1542 }
1543
1544
1545
1546
1547
1548
1549 static s64
1550 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1551 const struct pnfs_layout_range *l2)
1552 {
1553 s64 d;
1554
1555
1556 d = l1->offset - l2->offset;
1557 if (d)
1558 return d;
1559
1560
1561 d = l2->length - l1->length;
1562 if (d)
1563 return d;
1564
1565
1566 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1567 }
1568
1569 static bool
1570 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1571 const struct pnfs_layout_range *l2)
1572 {
1573 return pnfs_lseg_range_cmp(l1, l2) > 0;
1574 }
1575
1576 static bool
1577 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1578 struct pnfs_layout_segment *old)
1579 {
1580 return false;
1581 }
1582
1583 void
1584 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1585 struct pnfs_layout_segment *lseg,
1586 bool (*is_after)(const struct pnfs_layout_range *,
1587 const struct pnfs_layout_range *),
1588 bool (*do_merge)(struct pnfs_layout_segment *,
1589 struct pnfs_layout_segment *),
1590 struct list_head *free_me)
1591 {
1592 struct pnfs_layout_segment *lp, *tmp;
1593
1594 dprintk("%s:Begin\n", __func__);
1595
1596 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1597 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1598 continue;
1599 if (do_merge(lseg, lp)) {
1600 mark_lseg_invalid(lp, free_me);
1601 continue;
1602 }
1603 if (is_after(&lseg->pls_range, &lp->pls_range))
1604 continue;
1605 list_add_tail(&lseg->pls_list, &lp->pls_list);
1606 dprintk("%s: inserted lseg %p "
1607 "iomode %d offset %llu length %llu before "
1608 "lp %p iomode %d offset %llu length %llu\n",
1609 __func__, lseg, lseg->pls_range.iomode,
1610 lseg->pls_range.offset, lseg->pls_range.length,
1611 lp, lp->pls_range.iomode, lp->pls_range.offset,
1612 lp->pls_range.length);
1613 goto out;
1614 }
1615 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1616 dprintk("%s: inserted lseg %p "
1617 "iomode %d offset %llu length %llu at tail\n",
1618 __func__, lseg, lseg->pls_range.iomode,
1619 lseg->pls_range.offset, lseg->pls_range.length);
1620 out:
1621 pnfs_get_layout_hdr(lo);
1622
1623 dprintk("%s:Return\n", __func__);
1624 }
1625 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1626
1627 static void
1628 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1629 struct pnfs_layout_segment *lseg,
1630 struct list_head *free_me)
1631 {
1632 struct inode *inode = lo->plh_inode;
1633 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1634
1635 if (ld->add_lseg != NULL)
1636 ld->add_lseg(lo, lseg, free_me);
1637 else
1638 pnfs_generic_layout_insert_lseg(lo, lseg,
1639 pnfs_lseg_range_is_after,
1640 pnfs_lseg_no_merge,
1641 free_me);
1642 }
1643
1644 static struct pnfs_layout_hdr *
1645 alloc_init_layout_hdr(struct inode *ino,
1646 struct nfs_open_context *ctx,
1647 gfp_t gfp_flags)
1648 {
1649 struct pnfs_layout_hdr *lo;
1650
1651 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1652 if (!lo)
1653 return NULL;
1654 refcount_set(&lo->plh_refcount, 1);
1655 INIT_LIST_HEAD(&lo->plh_layouts);
1656 INIT_LIST_HEAD(&lo->plh_segs);
1657 INIT_LIST_HEAD(&lo->plh_return_segs);
1658 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1659 lo->plh_inode = ino;
1660 lo->plh_lc_cred = get_cred(ctx->cred);
1661 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1662 return lo;
1663 }
1664
1665 static struct pnfs_layout_hdr *
1666 pnfs_find_alloc_layout(struct inode *ino,
1667 struct nfs_open_context *ctx,
1668 gfp_t gfp_flags)
1669 __releases(&ino->i_lock)
1670 __acquires(&ino->i_lock)
1671 {
1672 struct nfs_inode *nfsi = NFS_I(ino);
1673 struct pnfs_layout_hdr *new = NULL;
1674
1675 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1676
1677 if (nfsi->layout != NULL)
1678 goto out_existing;
1679 spin_unlock(&ino->i_lock);
1680 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1681 spin_lock(&ino->i_lock);
1682
1683 if (likely(nfsi->layout == NULL)) {
1684 nfsi->layout = new;
1685 return new;
1686 } else if (new != NULL)
1687 pnfs_free_layout_hdr(new);
1688 out_existing:
1689 pnfs_get_layout_hdr(nfsi->layout);
1690 return nfsi->layout;
1691 }
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706 static bool
1707 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1708 const struct pnfs_layout_range *range,
1709 bool strict_iomode)
1710 {
1711 struct pnfs_layout_range range1;
1712
1713 if ((range->iomode == IOMODE_RW &&
1714 ls_range->iomode != IOMODE_RW) ||
1715 (range->iomode != ls_range->iomode &&
1716 strict_iomode) ||
1717 !pnfs_lseg_range_intersecting(ls_range, range))
1718 return false;
1719
1720
1721 range1 = *range;
1722 range1.length = 1;
1723 return pnfs_lseg_range_contained(ls_range, &range1);
1724 }
1725
1726
1727
1728
1729 static struct pnfs_layout_segment *
1730 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1731 struct pnfs_layout_range *range,
1732 bool strict_iomode)
1733 {
1734 struct pnfs_layout_segment *lseg, *ret = NULL;
1735
1736 dprintk("%s:Begin\n", __func__);
1737
1738 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1739 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1740 pnfs_lseg_range_match(&lseg->pls_range, range,
1741 strict_iomode)) {
1742 ret = pnfs_get_lseg(lseg);
1743 break;
1744 }
1745 }
1746
1747 dprintk("%s:Return lseg %p ref %d\n",
1748 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1749 return ret;
1750 }
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1772 struct inode *ino, int iomode)
1773 {
1774 struct nfs4_threshold *t = ctx->mdsthreshold;
1775 struct nfs_inode *nfsi = NFS_I(ino);
1776 loff_t fsize = i_size_read(ino);
1777 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1778
1779 if (t == NULL)
1780 return ret;
1781
1782 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1783 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1784
1785 switch (iomode) {
1786 case IOMODE_READ:
1787 if (t->bm & THRESHOLD_RD) {
1788 dprintk("%s fsize %llu\n", __func__, fsize);
1789 size_set = true;
1790 if (fsize < t->rd_sz)
1791 size = true;
1792 }
1793 if (t->bm & THRESHOLD_RD_IO) {
1794 dprintk("%s nfsi->read_io %llu\n", __func__,
1795 nfsi->read_io);
1796 io_set = true;
1797 if (nfsi->read_io < t->rd_io_sz)
1798 io = true;
1799 }
1800 break;
1801 case IOMODE_RW:
1802 if (t->bm & THRESHOLD_WR) {
1803 dprintk("%s fsize %llu\n", __func__, fsize);
1804 size_set = true;
1805 if (fsize < t->wr_sz)
1806 size = true;
1807 }
1808 if (t->bm & THRESHOLD_WR_IO) {
1809 dprintk("%s nfsi->write_io %llu\n", __func__,
1810 nfsi->write_io);
1811 io_set = true;
1812 if (nfsi->write_io < t->wr_io_sz)
1813 io = true;
1814 }
1815 break;
1816 }
1817 if (size_set && io_set) {
1818 if (size && io)
1819 ret = true;
1820 } else if (size || io)
1821 ret = true;
1822
1823 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1824 return ret;
1825 }
1826
1827 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1828 {
1829
1830
1831
1832
1833 pnfs_layoutcommit_inode(lo->plh_inode, false);
1834 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1835 nfs_wait_bit_killable,
1836 TASK_KILLABLE);
1837 }
1838
1839 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1840 {
1841 atomic_inc(&lo->plh_outstanding);
1842 }
1843
1844 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1845 {
1846 if (atomic_dec_and_test(&lo->plh_outstanding))
1847 wake_up_var(&lo->plh_outstanding);
1848 }
1849
1850 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1851 {
1852 unsigned long *bitlock = &lo->plh_flags;
1853
1854 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1855 smp_mb__after_atomic();
1856 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1857 }
1858
1859 static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1860 struct nfs_server *server)
1861 {
1862 if (list_empty(&lo->plh_layouts)) {
1863 struct nfs_client *clp = server->nfs_client;
1864
1865
1866
1867
1868 spin_lock(&clp->cl_lock);
1869 if (list_empty(&lo->plh_layouts))
1870 list_add_tail(&lo->plh_layouts, &server->layouts);
1871 spin_unlock(&clp->cl_lock);
1872 }
1873 }
1874
1875
1876
1877
1878
1879 struct pnfs_layout_segment *
1880 pnfs_update_layout(struct inode *ino,
1881 struct nfs_open_context *ctx,
1882 loff_t pos,
1883 u64 count,
1884 enum pnfs_iomode iomode,
1885 bool strict_iomode,
1886 gfp_t gfp_flags)
1887 {
1888 struct pnfs_layout_range arg = {
1889 .iomode = iomode,
1890 .offset = pos,
1891 .length = count,
1892 };
1893 unsigned pg_offset;
1894 struct nfs_server *server = NFS_SERVER(ino);
1895 struct nfs_client *clp = server->nfs_client;
1896 struct pnfs_layout_hdr *lo = NULL;
1897 struct pnfs_layout_segment *lseg = NULL;
1898 struct nfs4_layoutget *lgp;
1899 nfs4_stateid stateid;
1900 long timeout = 0;
1901 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1902 bool first;
1903
1904 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1905 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1906 PNFS_UPDATE_LAYOUT_NO_PNFS);
1907 goto out;
1908 }
1909
1910 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1911 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1912 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1913 goto out;
1914 }
1915
1916 lookup_again:
1917 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1918 if (IS_ERR(lseg))
1919 goto out;
1920 first = false;
1921 spin_lock(&ino->i_lock);
1922 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1923 if (lo == NULL) {
1924 spin_unlock(&ino->i_lock);
1925 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1926 PNFS_UPDATE_LAYOUT_NOMEM);
1927 goto out;
1928 }
1929
1930
1931 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1932 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1933 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1934 dprintk("%s matches recall, use MDS\n", __func__);
1935 goto out_unlock;
1936 }
1937
1938
1939 if (pnfs_layout_io_test_failed(lo, iomode)) {
1940 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1941 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1942 goto out_unlock;
1943 }
1944
1945
1946
1947
1948
1949 if (list_empty(&lo->plh_segs) &&
1950 atomic_read(&lo->plh_outstanding) != 0) {
1951 spin_unlock(&ino->i_lock);
1952 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1953 !atomic_read(&lo->plh_outstanding)));
1954 if (IS_ERR(lseg))
1955 goto out_put_layout_hdr;
1956 pnfs_put_layout_hdr(lo);
1957 goto lookup_again;
1958 }
1959
1960 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1961 if (lseg) {
1962 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1963 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1964 goto out_unlock;
1965 }
1966
1967
1968
1969
1970
1971
1972 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1973 int status;
1974
1975
1976
1977
1978
1979 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1980 &lo->plh_flags)) {
1981 spin_unlock(&ino->i_lock);
1982 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
1983 NFS_LAYOUT_FIRST_LAYOUTGET,
1984 TASK_KILLABLE));
1985 if (IS_ERR(lseg))
1986 goto out_put_layout_hdr;
1987 pnfs_put_layout_hdr(lo);
1988 dprintk("%s retrying\n", __func__);
1989 goto lookup_again;
1990 }
1991
1992 first = true;
1993 status = nfs4_select_rw_stateid(ctx->state,
1994 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1995 NULL, &stateid, NULL);
1996 if (status != 0) {
1997 lseg = ERR_PTR(status);
1998 trace_pnfs_update_layout(ino, pos, count,
1999 iomode, lo, lseg,
2000 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2001 if (status != -EAGAIN)
2002 goto out_unlock;
2003 spin_unlock(&ino->i_lock);
2004 nfs4_schedule_stateid_recovery(server, ctx->state);
2005 pnfs_clear_first_layoutget(lo);
2006 pnfs_put_layout_hdr(lo);
2007 goto lookup_again;
2008 }
2009 } else {
2010 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2011 }
2012
2013
2014
2015
2016
2017 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2018 spin_unlock(&ino->i_lock);
2019 dprintk("%s wait for layoutreturn\n", __func__);
2020 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2021 if (!IS_ERR(lseg)) {
2022 if (first)
2023 pnfs_clear_first_layoutget(lo);
2024 pnfs_put_layout_hdr(lo);
2025 dprintk("%s retrying\n", __func__);
2026 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2027 lseg, PNFS_UPDATE_LAYOUT_RETRY);
2028 goto lookup_again;
2029 }
2030 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2031 PNFS_UPDATE_LAYOUT_RETURN);
2032 goto out_put_layout_hdr;
2033 }
2034
2035 if (pnfs_layoutgets_blocked(lo)) {
2036 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2037 PNFS_UPDATE_LAYOUT_BLOCKED);
2038 goto out_unlock;
2039 }
2040 nfs_layoutget_begin(lo);
2041 spin_unlock(&ino->i_lock);
2042
2043 _add_to_server_list(lo, server);
2044
2045 pg_offset = arg.offset & ~PAGE_MASK;
2046 if (pg_offset) {
2047 arg.offset -= pg_offset;
2048 arg.length += pg_offset;
2049 }
2050 if (arg.length != NFS4_MAX_UINT64)
2051 arg.length = PAGE_ALIGN(arg.length);
2052
2053 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2054 if (!lgp) {
2055 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2056 PNFS_UPDATE_LAYOUT_NOMEM);
2057 nfs_layoutget_end(lo);
2058 goto out_put_layout_hdr;
2059 }
2060
2061 lseg = nfs4_proc_layoutget(lgp, &timeout);
2062 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2063 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2064 nfs_layoutget_end(lo);
2065 if (IS_ERR(lseg)) {
2066 switch(PTR_ERR(lseg)) {
2067 case -EBUSY:
2068 if (time_after(jiffies, giveup))
2069 lseg = NULL;
2070 break;
2071 case -ERECALLCONFLICT:
2072 case -EAGAIN:
2073 break;
2074 default:
2075 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2076 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2077 lseg = NULL;
2078 }
2079 goto out_put_layout_hdr;
2080 }
2081 if (lseg) {
2082 if (first)
2083 pnfs_clear_first_layoutget(lo);
2084 trace_pnfs_update_layout(ino, pos, count,
2085 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2086 pnfs_put_layout_hdr(lo);
2087 goto lookup_again;
2088 }
2089 } else {
2090 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2091 }
2092
2093 out_put_layout_hdr:
2094 if (first)
2095 pnfs_clear_first_layoutget(lo);
2096 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2097 PNFS_UPDATE_LAYOUT_EXIT);
2098 pnfs_put_layout_hdr(lo);
2099 out:
2100 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2101 "(%s, offset: %llu, length: %llu)\n",
2102 __func__, ino->i_sb->s_id,
2103 (unsigned long long)NFS_FILEID(ino),
2104 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2105 iomode==IOMODE_RW ? "read/write" : "read-only",
2106 (unsigned long long)pos,
2107 (unsigned long long)count);
2108 return lseg;
2109 out_unlock:
2110 spin_unlock(&ino->i_lock);
2111 goto out_put_layout_hdr;
2112 }
2113 EXPORT_SYMBOL_GPL(pnfs_update_layout);
2114
2115 static bool
2116 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2117 {
2118 switch (range->iomode) {
2119 case IOMODE_READ:
2120 case IOMODE_RW:
2121 break;
2122 default:
2123 return false;
2124 }
2125 if (range->offset == NFS4_MAX_UINT64)
2126 return false;
2127 if (range->length == 0)
2128 return false;
2129 if (range->length != NFS4_MAX_UINT64 &&
2130 range->length > NFS4_MAX_UINT64 - range->offset)
2131 return false;
2132 return true;
2133 }
2134
2135 static struct pnfs_layout_hdr *
2136 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2137 {
2138 struct pnfs_layout_hdr *lo;
2139
2140 spin_lock(&ino->i_lock);
2141 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2142 if (!lo)
2143 goto out_unlock;
2144 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2145 goto out_unlock;
2146 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2147 goto out_unlock;
2148 if (pnfs_layoutgets_blocked(lo))
2149 goto out_unlock;
2150 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2151 goto out_unlock;
2152 nfs_layoutget_begin(lo);
2153 spin_unlock(&ino->i_lock);
2154 _add_to_server_list(lo, NFS_SERVER(ino));
2155 return lo;
2156
2157 out_unlock:
2158 spin_unlock(&ino->i_lock);
2159 pnfs_put_layout_hdr(lo);
2160 return NULL;
2161 }
2162
2163 extern const nfs4_stateid current_stateid;
2164
2165 static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2166 struct nfs_open_context *ctx)
2167 {
2168 struct inode *ino = data->dentry->d_inode;
2169 struct pnfs_layout_range rng = {
2170 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2171 IOMODE_RW: IOMODE_READ,
2172 .offset = 0,
2173 .length = NFS4_MAX_UINT64,
2174 };
2175 struct nfs4_layoutget *lgp;
2176 struct pnfs_layout_hdr *lo;
2177
2178
2179 if (rng.iomode == IOMODE_READ &&
2180 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2181 return;
2182
2183 lo = _pnfs_grab_empty_layout(ino, ctx);
2184 if (!lo)
2185 return;
2186 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2187 &rng, GFP_KERNEL);
2188 if (!lgp) {
2189 pnfs_clear_first_layoutget(lo);
2190 pnfs_put_layout_hdr(lo);
2191 return;
2192 }
2193 data->lgp = lgp;
2194 data->o_arg.lg_args = &lgp->args;
2195 data->o_res.lg_res = &lgp->res;
2196 }
2197
2198 static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2199 struct nfs_open_context *ctx)
2200 {
2201 struct pnfs_layout_range rng = {
2202 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2203 IOMODE_RW: IOMODE_READ,
2204 .offset = 0,
2205 .length = NFS4_MAX_UINT64,
2206 };
2207 struct nfs4_layoutget *lgp;
2208
2209 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2210 &rng, GFP_KERNEL);
2211 if (!lgp)
2212 return;
2213 data->lgp = lgp;
2214 data->o_arg.lg_args = &lgp->args;
2215 data->o_res.lg_res = &lgp->res;
2216 }
2217
2218 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2219 struct nfs_open_context *ctx)
2220 {
2221 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2222
2223 if (!(pnfs_enabled_sb(server) &&
2224 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2225 return;
2226
2227 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2228 return;
2229 if (data->state)
2230 _lgopen_prepare_attached(data, ctx);
2231 else
2232 _lgopen_prepare_floating(data, ctx);
2233 }
2234
2235 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2236 struct nfs_open_context *ctx)
2237 {
2238 struct pnfs_layout_hdr *lo;
2239 struct pnfs_layout_segment *lseg;
2240 struct nfs_server *srv = NFS_SERVER(ino);
2241 u32 iomode;
2242
2243 if (!lgp)
2244 return;
2245 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2246 if (lgp->res.status) {
2247 switch (lgp->res.status) {
2248 default:
2249 break;
2250
2251
2252
2253
2254
2255
2256
2257 case -NFS4ERR_BAD_STATEID:
2258 case -NFS4ERR_NOTSUPP:
2259 case -NFS4ERR_REP_TOO_BIG:
2260 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2261 case -NFS4ERR_REQ_TOO_BIG:
2262 case -NFS4ERR_TOO_MANY_OPS:
2263 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2264 srv->caps &= ~NFS_CAP_LGOPEN;
2265 }
2266 return;
2267 }
2268 if (!lgp->args.inode) {
2269 lo = _pnfs_grab_empty_layout(ino, ctx);
2270 if (!lo)
2271 return;
2272 lgp->args.inode = ino;
2273 } else
2274 lo = NFS_I(lgp->args.inode)->layout;
2275
2276 lseg = pnfs_layout_process(lgp);
2277 if (!IS_ERR(lseg)) {
2278 iomode = lgp->args.range.iomode;
2279 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2280 pnfs_put_lseg(lseg);
2281 }
2282 }
2283
2284 void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2285 {
2286 if (lgp != NULL) {
2287 struct inode *inode = lgp->args.inode;
2288 if (inode) {
2289 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2290 pnfs_clear_first_layoutget(lo);
2291 nfs_layoutget_end(lo);
2292 }
2293 pnfs_layoutget_free(lgp);
2294 }
2295 }
2296
2297 struct pnfs_layout_segment *
2298 pnfs_layout_process(struct nfs4_layoutget *lgp)
2299 {
2300 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2301 struct nfs4_layoutget_res *res = &lgp->res;
2302 struct pnfs_layout_segment *lseg;
2303 struct inode *ino = lo->plh_inode;
2304 LIST_HEAD(free_me);
2305
2306 if (!pnfs_sanity_check_layout_range(&res->range))
2307 return ERR_PTR(-EINVAL);
2308
2309
2310 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2311 if (IS_ERR_OR_NULL(lseg)) {
2312 if (!lseg)
2313 lseg = ERR_PTR(-ENOMEM);
2314
2315 dprintk("%s: Could not allocate layout: error %ld\n",
2316 __func__, PTR_ERR(lseg));
2317 return lseg;
2318 }
2319
2320 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2321
2322 spin_lock(&ino->i_lock);
2323 if (pnfs_layoutgets_blocked(lo)) {
2324 dprintk("%s forget reply due to state\n", __func__);
2325 goto out_forget;
2326 }
2327
2328 if (!pnfs_layout_is_valid(lo)) {
2329
2330 pnfs_set_layout_stateid(lo, &res->stateid, true);
2331 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2332
2333 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2334 dprintk("%s forget reply due to sequence\n", __func__);
2335 goto out_forget;
2336 }
2337 pnfs_set_layout_stateid(lo, &res->stateid, false);
2338 } else {
2339
2340
2341
2342
2343 pnfs_mark_layout_stateid_invalid(lo, &free_me);
2344 goto out_forget;
2345 }
2346
2347 pnfs_get_lseg(lseg);
2348 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2349
2350
2351 if (res->return_on_close)
2352 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2353
2354 spin_unlock(&ino->i_lock);
2355 pnfs_free_lseg_list(&free_me);
2356 return lseg;
2357
2358 out_forget:
2359 spin_unlock(&ino->i_lock);
2360 lseg->pls_layout = lo;
2361 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2362 return ERR_PTR(-EAGAIN);
2363 }
2364
2365 static int
2366 mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
2367 struct list_head *tmp_list)
2368 {
2369 if (!mark_lseg_invalid(lseg, tmp_list))
2370 return 0;
2371 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
2372 return 1;
2373 }
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391 int
2392 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2393 struct list_head *tmp_list,
2394 const struct pnfs_layout_range *return_range,
2395 u32 seq)
2396 {
2397 struct pnfs_layout_segment *lseg, *next;
2398 int remaining = 0;
2399
2400 dprintk("%s:Begin lo %p\n", __func__, lo);
2401
2402 assert_spin_locked(&lo->plh_inode->i_lock);
2403
2404 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2405 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2406 dprintk("%s: marking lseg %p iomode %d "
2407 "offset %llu length %llu\n", __func__,
2408 lseg, lseg->pls_range.iomode,
2409 lseg->pls_range.offset,
2410 lseg->pls_range.length);
2411 if (mark_lseg_invalid_or_return(lseg, tmp_list))
2412 continue;
2413 remaining++;
2414 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2415 }
2416
2417 if (remaining) {
2418 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2419 return -EBUSY;
2420 }
2421
2422 if (!list_empty(&lo->plh_return_segs)) {
2423 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2424 return 0;
2425 }
2426
2427 return -ENOENT;
2428 }
2429
2430 void pnfs_error_mark_layout_for_return(struct inode *inode,
2431 struct pnfs_layout_segment *lseg)
2432 {
2433 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2434 struct pnfs_layout_range range = {
2435 .iomode = lseg->pls_range.iomode,
2436 .offset = 0,
2437 .length = NFS4_MAX_UINT64,
2438 };
2439 bool return_now = false;
2440
2441 spin_lock(&inode->i_lock);
2442 if (!pnfs_layout_is_valid(lo)) {
2443 spin_unlock(&inode->i_lock);
2444 return;
2445 }
2446 pnfs_set_plh_return_info(lo, range.iomode, 0);
2447
2448
2449
2450
2451
2452 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
2453 nfs4_stateid stateid;
2454 enum pnfs_iomode iomode;
2455
2456 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2457 spin_unlock(&inode->i_lock);
2458 if (return_now)
2459 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2460 } else {
2461 spin_unlock(&inode->i_lock);
2462 nfs_commit_inode(inode, 0);
2463 }
2464 }
2465 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2466
2467 void
2468 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2469 {
2470 if (pgio->pg_lseg == NULL ||
2471 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2472 return;
2473 pnfs_put_lseg(pgio->pg_lseg);
2474 pgio->pg_lseg = NULL;
2475 }
2476 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2477
2478
2479
2480
2481
2482 static void
2483 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2484 {
2485 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2486 pnfs_put_lseg(pgio->pg_lseg);
2487 pgio->pg_lseg = NULL;
2488 }
2489 }
2490
2491 void
2492 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2493 {
2494 u64 rd_size = req->wb_bytes;
2495
2496 pnfs_generic_pg_check_layout(pgio);
2497 pnfs_generic_pg_check_range(pgio, req);
2498 if (pgio->pg_lseg == NULL) {
2499 if (pgio->pg_dreq == NULL)
2500 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2501 else
2502 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2503
2504 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2505 nfs_req_openctx(req),
2506 req_offset(req),
2507 rd_size,
2508 IOMODE_READ,
2509 false,
2510 GFP_KERNEL);
2511 if (IS_ERR(pgio->pg_lseg)) {
2512 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2513 pgio->pg_lseg = NULL;
2514 return;
2515 }
2516 }
2517
2518 if (pgio->pg_lseg == NULL)
2519 nfs_pageio_reset_read_mds(pgio);
2520
2521 }
2522 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2523
2524 void
2525 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2526 struct nfs_page *req, u64 wb_size)
2527 {
2528 pnfs_generic_pg_check_layout(pgio);
2529 pnfs_generic_pg_check_range(pgio, req);
2530 if (pgio->pg_lseg == NULL) {
2531 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2532 nfs_req_openctx(req),
2533 req_offset(req),
2534 wb_size,
2535 IOMODE_RW,
2536 false,
2537 GFP_KERNEL);
2538 if (IS_ERR(pgio->pg_lseg)) {
2539 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2540 pgio->pg_lseg = NULL;
2541 return;
2542 }
2543 }
2544
2545 if (pgio->pg_lseg == NULL)
2546 nfs_pageio_reset_write_mds(pgio);
2547 }
2548 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2549
2550 void
2551 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2552 {
2553 if (desc->pg_lseg) {
2554 pnfs_put_lseg(desc->pg_lseg);
2555 desc->pg_lseg = NULL;
2556 }
2557 }
2558 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2559
2560
2561
2562
2563
2564 size_t
2565 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2566 struct nfs_page *prev, struct nfs_page *req)
2567 {
2568 unsigned int size;
2569 u64 seg_end, req_start, seg_left;
2570
2571 size = nfs_generic_pg_test(pgio, prev, req);
2572 if (!size)
2573 return 0;
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586 if (pgio->pg_lseg) {
2587 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2588 pgio->pg_lseg->pls_range.length);
2589 req_start = req_offset(req);
2590
2591
2592 if (req_start >= seg_end)
2593 return 0;
2594
2595
2596
2597 seg_left = seg_end - req_start;
2598 if (seg_left < size)
2599 size = (unsigned int)seg_left;
2600 }
2601
2602 return size;
2603 }
2604 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2605
2606 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2607 {
2608 struct nfs_pageio_descriptor pgio;
2609
2610
2611 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2612 hdr->completion_ops);
2613 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2614 return nfs_pageio_resend(&pgio, hdr);
2615 }
2616 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2617
2618 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2619 {
2620
2621 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2622 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2623 PNFS_LAYOUTRET_ON_ERROR) {
2624 pnfs_return_layout(hdr->inode);
2625 }
2626 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2627 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2628 }
2629
2630
2631
2632
2633 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2634 {
2635 if (likely(!hdr->pnfs_error)) {
2636 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2637 hdr->mds_offset + hdr->res.count);
2638 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2639 }
2640 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2641 if (unlikely(hdr->pnfs_error))
2642 pnfs_ld_handle_write_error(hdr);
2643 hdr->mds_ops->rpc_release(hdr);
2644 }
2645 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2646
2647 static void
2648 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2649 struct nfs_pgio_header *hdr)
2650 {
2651 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2652
2653 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2654 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2655 nfs_pageio_reset_write_mds(desc);
2656 mirror->pg_recoalesce = 1;
2657 }
2658 hdr->completion_ops->completion(hdr);
2659 }
2660
2661 static enum pnfs_try_status
2662 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2663 const struct rpc_call_ops *call_ops,
2664 struct pnfs_layout_segment *lseg,
2665 int how)
2666 {
2667 struct inode *inode = hdr->inode;
2668 enum pnfs_try_status trypnfs;
2669 struct nfs_server *nfss = NFS_SERVER(inode);
2670
2671 hdr->mds_ops = call_ops;
2672
2673 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2674 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2675 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2676 if (trypnfs != PNFS_NOT_ATTEMPTED)
2677 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2678 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2679 return trypnfs;
2680 }
2681
2682 static void
2683 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2684 struct nfs_pgio_header *hdr, int how)
2685 {
2686 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2687 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2688 enum pnfs_try_status trypnfs;
2689
2690 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2691 switch (trypnfs) {
2692 case PNFS_NOT_ATTEMPTED:
2693 pnfs_write_through_mds(desc, hdr);
2694 case PNFS_ATTEMPTED:
2695 break;
2696 case PNFS_TRY_AGAIN:
2697
2698 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2699 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2700 list_splice_init(&hdr->pages, &mirror->pg_list);
2701 mirror->pg_recoalesce = 1;
2702 }
2703 hdr->mds_ops->rpc_release(hdr);
2704 }
2705 }
2706
2707 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2708 {
2709 pnfs_put_lseg(hdr->lseg);
2710 nfs_pgio_header_free(hdr);
2711 }
2712
2713 int
2714 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2715 {
2716 struct nfs_pgio_header *hdr;
2717 int ret;
2718
2719 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2720 if (!hdr) {
2721 desc->pg_error = -ENOMEM;
2722 return desc->pg_error;
2723 }
2724 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2725
2726 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2727 ret = nfs_generic_pgio(desc, hdr);
2728 if (!ret)
2729 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2730
2731 return ret;
2732 }
2733 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2734
2735 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2736 {
2737 struct nfs_pageio_descriptor pgio;
2738
2739
2740 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2741 return nfs_pageio_resend(&pgio, hdr);
2742 }
2743 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2744
2745 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2746 {
2747 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2748 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2749 PNFS_LAYOUTRET_ON_ERROR) {
2750 pnfs_return_layout(hdr->inode);
2751 }
2752 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2753 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2754 }
2755
2756
2757
2758
2759 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2760 {
2761 if (likely(!hdr->pnfs_error))
2762 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2763 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2764 if (unlikely(hdr->pnfs_error))
2765 pnfs_ld_handle_read_error(hdr);
2766 hdr->mds_ops->rpc_release(hdr);
2767 }
2768 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2769
2770 static void
2771 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2772 struct nfs_pgio_header *hdr)
2773 {
2774 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2775
2776 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2777 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2778 nfs_pageio_reset_read_mds(desc);
2779 mirror->pg_recoalesce = 1;
2780 }
2781 hdr->completion_ops->completion(hdr);
2782 }
2783
2784
2785
2786
2787 static enum pnfs_try_status
2788 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2789 const struct rpc_call_ops *call_ops,
2790 struct pnfs_layout_segment *lseg)
2791 {
2792 struct inode *inode = hdr->inode;
2793 struct nfs_server *nfss = NFS_SERVER(inode);
2794 enum pnfs_try_status trypnfs;
2795
2796 hdr->mds_ops = call_ops;
2797
2798 dprintk("%s: Reading ino:%lu %u@%llu\n",
2799 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2800
2801 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2802 if (trypnfs != PNFS_NOT_ATTEMPTED)
2803 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2804 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2805 return trypnfs;
2806 }
2807
2808
2809 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2810 {
2811 struct nfs_pageio_descriptor pgio;
2812
2813 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2814
2815 pnfs_put_lseg(hdr->lseg);
2816 hdr->lseg = NULL;
2817
2818 nfs_pageio_init_read(&pgio, hdr->inode, false,
2819 hdr->completion_ops);
2820 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2821 }
2822 }
2823 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2824
2825 static void
2826 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2827 {
2828 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2829 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2830 enum pnfs_try_status trypnfs;
2831
2832 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2833 switch (trypnfs) {
2834 case PNFS_NOT_ATTEMPTED:
2835 pnfs_read_through_mds(desc, hdr);
2836 case PNFS_ATTEMPTED:
2837 break;
2838 case PNFS_TRY_AGAIN:
2839
2840 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2841 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2842 list_splice_init(&hdr->pages, &mirror->pg_list);
2843 mirror->pg_recoalesce = 1;
2844 }
2845 hdr->mds_ops->rpc_release(hdr);
2846 }
2847 }
2848
2849 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2850 {
2851 pnfs_put_lseg(hdr->lseg);
2852 nfs_pgio_header_free(hdr);
2853 }
2854
2855 int
2856 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2857 {
2858 struct nfs_pgio_header *hdr;
2859 int ret;
2860
2861 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2862 if (!hdr) {
2863 desc->pg_error = -ENOMEM;
2864 return desc->pg_error;
2865 }
2866 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2867 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2868 ret = nfs_generic_pgio(desc, hdr);
2869 if (!ret)
2870 pnfs_do_read(desc, hdr);
2871 return ret;
2872 }
2873 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2874
2875 static void pnfs_clear_layoutcommitting(struct inode *inode)
2876 {
2877 unsigned long *bitlock = &NFS_I(inode)->flags;
2878
2879 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2880 smp_mb__after_atomic();
2881 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2882 }
2883
2884
2885
2886
2887 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2888 {
2889 struct pnfs_layout_segment *lseg;
2890
2891 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2892 if (lseg->pls_range.iomode == IOMODE_RW &&
2893 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2894 list_add(&lseg->pls_lc_list, listp);
2895 }
2896 }
2897
2898 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2899 {
2900 struct pnfs_layout_segment *lseg, *tmp;
2901
2902
2903 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2904 list_del_init(&lseg->pls_lc_list);
2905 pnfs_put_lseg(lseg);
2906 }
2907
2908 pnfs_clear_layoutcommitting(inode);
2909 }
2910
2911 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2912 {
2913 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2914 }
2915 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2916
2917 void
2918 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2919 loff_t end_pos)
2920 {
2921 struct nfs_inode *nfsi = NFS_I(inode);
2922 bool mark_as_dirty = false;
2923
2924 spin_lock(&inode->i_lock);
2925 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2926 nfsi->layout->plh_lwb = end_pos;
2927 mark_as_dirty = true;
2928 dprintk("%s: Set layoutcommit for inode %lu ",
2929 __func__, inode->i_ino);
2930 } else if (end_pos > nfsi->layout->plh_lwb)
2931 nfsi->layout->plh_lwb = end_pos;
2932 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2933
2934 pnfs_get_lseg(lseg);
2935 }
2936 spin_unlock(&inode->i_lock);
2937 dprintk("%s: lseg %p end_pos %llu\n",
2938 __func__, lseg, nfsi->layout->plh_lwb);
2939
2940
2941
2942 if (mark_as_dirty)
2943 mark_inode_dirty_sync(inode);
2944 }
2945 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2946
2947 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2948 {
2949 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2950
2951 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2952 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2953 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2954 }
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964 int
2965 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2966 {
2967 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2968 struct nfs4_layoutcommit_data *data;
2969 struct nfs_inode *nfsi = NFS_I(inode);
2970 loff_t end_pos;
2971 int status;
2972
2973 if (!pnfs_layoutcommit_outstanding(inode))
2974 return 0;
2975
2976 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2977
2978 status = -EAGAIN;
2979 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2980 if (!sync)
2981 goto out;
2982 status = wait_on_bit_lock_action(&nfsi->flags,
2983 NFS_INO_LAYOUTCOMMITTING,
2984 nfs_wait_bit_killable,
2985 TASK_KILLABLE);
2986 if (status)
2987 goto out;
2988 }
2989
2990 status = -ENOMEM;
2991
2992 data = kzalloc(sizeof(*data), GFP_NOFS);
2993 if (!data)
2994 goto clear_layoutcommitting;
2995
2996 status = 0;
2997 spin_lock(&inode->i_lock);
2998 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2999 goto out_unlock;
3000
3001 INIT_LIST_HEAD(&data->lseg_list);
3002 pnfs_list_write_lseg(inode, &data->lseg_list);
3003
3004 end_pos = nfsi->layout->plh_lwb;
3005
3006 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3007 spin_unlock(&inode->i_lock);
3008
3009 data->args.inode = inode;
3010 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3011 nfs_fattr_init(&data->fattr);
3012 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3013 data->res.fattr = &data->fattr;
3014 if (end_pos != 0)
3015 data->args.lastbytewritten = end_pos - 1;
3016 else
3017 data->args.lastbytewritten = U64_MAX;
3018 data->res.server = NFS_SERVER(inode);
3019
3020 if (ld->prepare_layoutcommit) {
3021 status = ld->prepare_layoutcommit(&data->args);
3022 if (status) {
3023 put_cred(data->cred);
3024 spin_lock(&inode->i_lock);
3025 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3026 if (end_pos > nfsi->layout->plh_lwb)
3027 nfsi->layout->plh_lwb = end_pos;
3028 goto out_unlock;
3029 }
3030 }
3031
3032
3033 status = nfs4_proc_layoutcommit(data, sync);
3034 out:
3035 if (status)
3036 mark_inode_dirty_sync(inode);
3037 dprintk("<-- %s status %d\n", __func__, status);
3038 return status;
3039 out_unlock:
3040 spin_unlock(&inode->i_lock);
3041 kfree(data);
3042 clear_layoutcommitting:
3043 pnfs_clear_layoutcommitting(inode);
3044 goto out;
3045 }
3046 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3047
3048 int
3049 pnfs_generic_sync(struct inode *inode, bool datasync)
3050 {
3051 return pnfs_layoutcommit_inode(inode, true);
3052 }
3053 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3054
3055 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3056 {
3057 struct nfs4_threshold *thp;
3058
3059 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3060 if (!thp) {
3061 dprintk("%s mdsthreshold allocation failed\n", __func__);
3062 return NULL;
3063 }
3064 return thp;
3065 }
3066
3067 #if IS_ENABLED(CONFIG_NFS_V4_2)
3068 int
3069 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3070 {
3071 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3072 struct nfs_server *server = NFS_SERVER(inode);
3073 struct nfs_inode *nfsi = NFS_I(inode);
3074 struct nfs42_layoutstat_data *data;
3075 struct pnfs_layout_hdr *hdr;
3076 int status = 0;
3077
3078 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3079 goto out;
3080
3081 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3082 goto out;
3083
3084 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3085 goto out;
3086
3087 spin_lock(&inode->i_lock);
3088 if (!NFS_I(inode)->layout) {
3089 spin_unlock(&inode->i_lock);
3090 goto out_clear_layoutstats;
3091 }
3092 hdr = NFS_I(inode)->layout;
3093 pnfs_get_layout_hdr(hdr);
3094 spin_unlock(&inode->i_lock);
3095
3096 data = kzalloc(sizeof(*data), gfp_flags);
3097 if (!data) {
3098 status = -ENOMEM;
3099 goto out_put;
3100 }
3101
3102 data->args.fh = NFS_FH(inode);
3103 data->args.inode = inode;
3104 status = ld->prepare_layoutstats(&data->args);
3105 if (status)
3106 goto out_free;
3107
3108 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3109
3110 out:
3111 dprintk("%s returns %d\n", __func__, status);
3112 return status;
3113
3114 out_free:
3115 kfree(data);
3116 out_put:
3117 pnfs_put_layout_hdr(hdr);
3118 out_clear_layoutstats:
3119 smp_mb__before_atomic();
3120 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3121 smp_mb__after_atomic();
3122 goto out;
3123 }
3124 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3125 #endif
3126
3127 unsigned int layoutstats_timer;
3128 module_param(layoutstats_timer, uint, 0644);
3129 EXPORT_SYMBOL_GPL(layoutstats_timer);