4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_page for VVP layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_LLITE
45 #include "../include/obd.h"
46 #include "../include/lustre_lite.h"
48 #include "vvp_internal.h"
50 /*****************************************************************************
56 static void vvp_page_fini_common(struct ccc_page
*cp
)
58 struct page
*vmpage
= cp
->cpg_page
;
60 LASSERT(vmpage
!= NULL
);
61 page_cache_release(vmpage
);
64 static void vvp_page_fini(const struct lu_env
*env
,
65 struct cl_page_slice
*slice
)
67 struct ccc_page
*cp
= cl2ccc_page(slice
);
68 struct page
*vmpage
= cp
->cpg_page
;
71 * vmpage->private was already cleared when page was moved into
74 LASSERT((struct cl_page
*)vmpage
->private != slice
->cpl_page
);
75 vvp_page_fini_common(cp
);
78 static int vvp_page_own(const struct lu_env
*env
,
79 const struct cl_page_slice
*slice
, struct cl_io
*io
,
82 struct ccc_page
*vpg
= cl2ccc_page(slice
);
83 struct page
*vmpage
= vpg
->cpg_page
;
85 LASSERT(vmpage
!= NULL
);
87 if (!trylock_page(vmpage
))
90 if (unlikely(PageWriteback(vmpage
))) {
99 wait_on_page_writeback(vmpage
);
103 static void vvp_page_assume(const struct lu_env
*env
,
104 const struct cl_page_slice
*slice
,
105 struct cl_io
*unused
)
107 struct page
*vmpage
= cl2vm_page(slice
);
109 LASSERT(vmpage
!= NULL
);
110 LASSERT(PageLocked(vmpage
));
111 wait_on_page_writeback(vmpage
);
114 static void vvp_page_unassume(const struct lu_env
*env
,
115 const struct cl_page_slice
*slice
,
116 struct cl_io
*unused
)
118 struct page
*vmpage
= cl2vm_page(slice
);
120 LASSERT(vmpage
!= NULL
);
121 LASSERT(PageLocked(vmpage
));
124 static void vvp_page_disown(const struct lu_env
*env
,
125 const struct cl_page_slice
*slice
, struct cl_io
*io
)
127 struct page
*vmpage
= cl2vm_page(slice
);
129 LASSERT(vmpage
!= NULL
);
130 LASSERT(PageLocked(vmpage
));
132 unlock_page(cl2vm_page(slice
));
135 static void vvp_page_discard(const struct lu_env
*env
,
136 const struct cl_page_slice
*slice
,
137 struct cl_io
*unused
)
139 struct page
*vmpage
= cl2vm_page(slice
);
140 struct address_space
*mapping
;
141 struct ccc_page
*cpg
= cl2ccc_page(slice
);
143 LASSERT(vmpage
!= NULL
);
144 LASSERT(PageLocked(vmpage
));
146 mapping
= vmpage
->mapping
;
148 if (cpg
->cpg_defer_uptodate
&& !cpg
->cpg_ra_used
)
149 ll_ra_stats_inc(mapping
, RA_STAT_DISCARDED
);
152 * truncate_complete_page() calls
153 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
155 truncate_complete_page(mapping
, vmpage
);
158 static int vvp_page_unmap(const struct lu_env
*env
,
159 const struct cl_page_slice
*slice
,
160 struct cl_io
*unused
)
162 struct page
*vmpage
= cl2vm_page(slice
);
165 LASSERT(vmpage
!= NULL
);
166 LASSERT(PageLocked(vmpage
));
168 offset
= vmpage
->index
<< PAGE_CACHE_SHIFT
;
171 * XXX is it safe to call this with the page lock held?
173 ll_teardown_mmaps(vmpage
->mapping
, offset
, offset
+ PAGE_CACHE_SIZE
);
177 static void vvp_page_delete(const struct lu_env
*env
,
178 const struct cl_page_slice
*slice
)
180 struct page
*vmpage
= cl2vm_page(slice
);
181 struct inode
*inode
= vmpage
->mapping
->host
;
182 struct cl_object
*obj
= slice
->cpl_obj
;
184 LASSERT(PageLocked(vmpage
));
185 LASSERT((struct cl_page
*)vmpage
->private == slice
->cpl_page
);
186 LASSERT(inode
== ccc_object_inode(obj
));
188 vvp_write_complete(cl2ccc(obj
), cl2ccc_page(slice
));
189 ClearPagePrivate(vmpage
);
192 * Reference from vmpage to cl_page is removed, but the reference back
193 * is still here. It is removed later in vvp_page_fini().
197 static void vvp_page_export(const struct lu_env
*env
,
198 const struct cl_page_slice
*slice
,
201 struct page
*vmpage
= cl2vm_page(slice
);
203 LASSERT(vmpage
!= NULL
);
204 LASSERT(PageLocked(vmpage
));
206 SetPageUptodate(vmpage
);
208 ClearPageUptodate(vmpage
);
211 static int vvp_page_is_vmlocked(const struct lu_env
*env
,
212 const struct cl_page_slice
*slice
)
214 return PageLocked(cl2vm_page(slice
)) ? -EBUSY
: -ENODATA
;
217 static int vvp_page_prep_read(const struct lu_env
*env
,
218 const struct cl_page_slice
*slice
,
219 struct cl_io
*unused
)
221 /* Skip the page already marked as PG_uptodate. */
222 return PageUptodate(cl2vm_page(slice
)) ? -EALREADY
: 0;
225 static int vvp_page_prep_write(const struct lu_env
*env
,
226 const struct cl_page_slice
*slice
,
227 struct cl_io
*unused
)
229 struct page
*vmpage
= cl2vm_page(slice
);
231 LASSERT(PageLocked(vmpage
));
232 LASSERT(!PageDirty(vmpage
));
234 set_page_writeback(vmpage
);
235 vvp_write_pending(cl2ccc(slice
->cpl_obj
), cl2ccc_page(slice
));
241 * Handles page transfer errors at VM level.
243 * This takes inode as a separate argument, because inode on which error is to
244 * be set can be different from \a vmpage inode in case of direct-io.
246 static void vvp_vmpage_error(struct inode
*inode
, struct page
*vmpage
, int ioret
)
248 struct ccc_object
*obj
= cl_inode2ccc(inode
);
251 ClearPageError(vmpage
);
252 obj
->cob_discard_page_warned
= 0;
254 SetPageError(vmpage
);
255 if (ioret
== -ENOSPC
)
256 set_bit(AS_ENOSPC
, &inode
->i_mapping
->flags
);
258 set_bit(AS_EIO
, &inode
->i_mapping
->flags
);
260 if ((ioret
== -ESHUTDOWN
|| ioret
== -EINTR
) &&
261 obj
->cob_discard_page_warned
== 0) {
262 obj
->cob_discard_page_warned
= 1;
263 ll_dirty_page_discard_warn(vmpage
, ioret
);
268 static void vvp_page_completion_read(const struct lu_env
*env
,
269 const struct cl_page_slice
*slice
,
272 struct ccc_page
*cp
= cl2ccc_page(slice
);
273 struct page
*vmpage
= cp
->cpg_page
;
274 struct cl_page
*page
= cl_page_top(slice
->cpl_page
);
275 struct inode
*inode
= ccc_object_inode(page
->cp_obj
);
277 LASSERT(PageLocked(vmpage
));
278 CL_PAGE_HEADER(D_PAGE
, env
, page
, "completing READ with %d\n", ioret
);
280 if (cp
->cpg_defer_uptodate
)
281 ll_ra_count_put(ll_i2sbi(inode
), 1);
284 if (!cp
->cpg_defer_uptodate
)
285 cl_page_export(env
, page
, 1);
287 cp
->cpg_defer_uptodate
= 0;
289 if (page
->cp_sync_io
== NULL
)
293 static void vvp_page_completion_write(const struct lu_env
*env
,
294 const struct cl_page_slice
*slice
,
297 struct ccc_page
*cp
= cl2ccc_page(slice
);
298 struct cl_page
*pg
= slice
->cpl_page
;
299 struct page
*vmpage
= cp
->cpg_page
;
301 LASSERT(ergo(pg
->cp_sync_io
!= NULL
, PageLocked(vmpage
)));
302 LASSERT(PageWriteback(vmpage
));
304 CL_PAGE_HEADER(D_PAGE
, env
, pg
, "completing WRITE with %d\n", ioret
);
307 * TODO: Actually it makes sense to add the page into oap pending
308 * list again and so that we don't need to take the page out from
309 * SoM write pending list, if we just meet a recoverable error,
311 * To implement this, we just need to return a non zero value in
312 * ->cpo_completion method. The underlying transfer should be notified
313 * and then re-add the page into pending transfer queue. -jay
316 cp
->cpg_write_queued
= 0;
317 vvp_write_complete(cl2ccc(slice
->cpl_obj
), cp
);
320 * Only mark the page error only when it's an async write because
321 * applications won't wait for IO to finish.
323 if (pg
->cp_sync_io
== NULL
)
324 vvp_vmpage_error(ccc_object_inode(pg
->cp_obj
), vmpage
, ioret
);
326 end_page_writeback(vmpage
);
330 * Implements cl_page_operations::cpo_make_ready() method.
332 * This is called to yank a page from the transfer cache and to send it out as
333 * a part of transfer. This function try-locks the page. If try-lock failed,
334 * page is owned by some concurrent IO, and should be skipped (this is bad,
335 * but hopefully rare situation, as it usually results in transfer being
336 * shorter than possible).
338 * \retval 0 success, page can be placed into transfer
340 * \retval -EAGAIN page is either used by concurrent IO has been
341 * truncated. Skip it.
343 static int vvp_page_make_ready(const struct lu_env
*env
,
344 const struct cl_page_slice
*slice
)
346 struct page
*vmpage
= cl2vm_page(slice
);
347 struct cl_page
*pg
= slice
->cpl_page
;
351 if (clear_page_dirty_for_io(vmpage
)) {
352 LASSERT(pg
->cp_state
== CPS_CACHED
);
353 /* This actually clears the dirty bit in the radix
355 set_page_writeback(vmpage
);
356 vvp_write_pending(cl2ccc(slice
->cpl_obj
),
358 CL_PAGE_HEADER(D_PAGE
, env
, pg
, "readied\n");
359 } else if (pg
->cp_state
== CPS_PAGEOUT
) {
360 /* is it possible for osc_flush_async_page() to already
364 CL_PAGE_DEBUG(D_ERROR
, env
, pg
, "Unexpecting page state %d.\n",
372 static int vvp_page_print(const struct lu_env
*env
,
373 const struct cl_page_slice
*slice
,
374 void *cookie
, lu_printer_t printer
)
376 struct ccc_page
*vp
= cl2ccc_page(slice
);
377 struct page
*vmpage
= vp
->cpg_page
;
379 (*printer
)(env
, cookie
, LUSTRE_VVP_NAME
"-page@%p(%d:%d:%d) "
381 vp
, vp
->cpg_defer_uptodate
, vp
->cpg_ra_used
,
382 vp
->cpg_write_queued
, vmpage
);
383 if (vmpage
!= NULL
) {
384 (*printer
)(env
, cookie
, "%lx %d:%d %lx %lu %slru",
385 (long)vmpage
->flags
, page_count(vmpage
),
386 page_mapcount(vmpage
), vmpage
->private,
388 list_empty(&vmpage
->lru
) ? "not-" : "");
390 (*printer
)(env
, cookie
, "\n");
394 static const struct cl_page_operations vvp_page_ops
= {
395 .cpo_own
= vvp_page_own
,
396 .cpo_assume
= vvp_page_assume
,
397 .cpo_unassume
= vvp_page_unassume
,
398 .cpo_disown
= vvp_page_disown
,
399 .cpo_vmpage
= ccc_page_vmpage
,
400 .cpo_discard
= vvp_page_discard
,
401 .cpo_delete
= vvp_page_delete
,
402 .cpo_unmap
= vvp_page_unmap
,
403 .cpo_export
= vvp_page_export
,
404 .cpo_is_vmlocked
= vvp_page_is_vmlocked
,
405 .cpo_fini
= vvp_page_fini
,
406 .cpo_print
= vvp_page_print
,
407 .cpo_is_under_lock
= ccc_page_is_under_lock
,
410 .cpo_prep
= vvp_page_prep_read
,
411 .cpo_completion
= vvp_page_completion_read
,
412 .cpo_make_ready
= ccc_fail
,
415 .cpo_prep
= vvp_page_prep_write
,
416 .cpo_completion
= vvp_page_completion_write
,
417 .cpo_make_ready
= vvp_page_make_ready
,
422 static void vvp_transient_page_verify(const struct cl_page
*page
)
424 struct inode
*inode
= ccc_object_inode(page
->cp_obj
);
426 LASSERT(!mutex_trylock(&inode
->i_mutex
));
429 static int vvp_transient_page_own(const struct lu_env
*env
,
430 const struct cl_page_slice
*slice
,
431 struct cl_io
*unused
, int nonblock
)
433 vvp_transient_page_verify(slice
->cpl_page
);
437 static void vvp_transient_page_assume(const struct lu_env
*env
,
438 const struct cl_page_slice
*slice
,
439 struct cl_io
*unused
)
441 vvp_transient_page_verify(slice
->cpl_page
);
444 static void vvp_transient_page_unassume(const struct lu_env
*env
,
445 const struct cl_page_slice
*slice
,
446 struct cl_io
*unused
)
448 vvp_transient_page_verify(slice
->cpl_page
);
451 static void vvp_transient_page_disown(const struct lu_env
*env
,
452 const struct cl_page_slice
*slice
,
453 struct cl_io
*unused
)
455 vvp_transient_page_verify(slice
->cpl_page
);
458 static void vvp_transient_page_discard(const struct lu_env
*env
,
459 const struct cl_page_slice
*slice
,
460 struct cl_io
*unused
)
462 struct cl_page
*page
= slice
->cpl_page
;
464 vvp_transient_page_verify(slice
->cpl_page
);
467 * For transient pages, remove it from the radix tree.
469 cl_page_delete(env
, page
);
472 static int vvp_transient_page_is_vmlocked(const struct lu_env
*env
,
473 const struct cl_page_slice
*slice
)
475 struct inode
*inode
= ccc_object_inode(slice
->cpl_obj
);
478 locked
= !mutex_trylock(&inode
->i_mutex
);
480 mutex_unlock(&inode
->i_mutex
);
481 return locked
? -EBUSY
: -ENODATA
;
485 vvp_transient_page_completion(const struct lu_env
*env
,
486 const struct cl_page_slice
*slice
,
489 vvp_transient_page_verify(slice
->cpl_page
);
492 static void vvp_transient_page_fini(const struct lu_env
*env
,
493 struct cl_page_slice
*slice
)
495 struct ccc_page
*cp
= cl2ccc_page(slice
);
496 struct cl_page
*clp
= slice
->cpl_page
;
497 struct ccc_object
*clobj
= cl2ccc(clp
->cp_obj
);
499 vvp_page_fini_common(cp
);
500 LASSERT(!mutex_trylock(&clobj
->cob_inode
->i_mutex
));
501 clobj
->cob_transient_pages
--;
504 static const struct cl_page_operations vvp_transient_page_ops
= {
505 .cpo_own
= vvp_transient_page_own
,
506 .cpo_assume
= vvp_transient_page_assume
,
507 .cpo_unassume
= vvp_transient_page_unassume
,
508 .cpo_disown
= vvp_transient_page_disown
,
509 .cpo_discard
= vvp_transient_page_discard
,
510 .cpo_vmpage
= ccc_page_vmpage
,
511 .cpo_fini
= vvp_transient_page_fini
,
512 .cpo_is_vmlocked
= vvp_transient_page_is_vmlocked
,
513 .cpo_print
= vvp_page_print
,
514 .cpo_is_under_lock
= ccc_page_is_under_lock
,
517 .cpo_prep
= ccc_transient_page_prep
,
518 .cpo_completion
= vvp_transient_page_completion
,
521 .cpo_prep
= ccc_transient_page_prep
,
522 .cpo_completion
= vvp_transient_page_completion
,
527 int vvp_page_init(const struct lu_env
*env
, struct cl_object
*obj
,
528 struct cl_page
*page
, struct page
*vmpage
)
530 struct ccc_page
*cpg
= cl_object_page_slice(obj
, page
);
532 CLOBINVRNT(env
, obj
, ccc_object_invariant(obj
));
534 cpg
->cpg_page
= vmpage
;
535 page_cache_get(vmpage
);
537 INIT_LIST_HEAD(&cpg
->cpg_pending_linkage
);
538 if (page
->cp_type
== CPT_CACHEABLE
) {
539 SetPagePrivate(vmpage
);
540 vmpage
->private = (unsigned long)page
;
541 cl_page_slice_add(page
, &cpg
->cpg_cl
, obj
,
544 struct ccc_object
*clobj
= cl2ccc(obj
);
546 LASSERT(!mutex_trylock(&clobj
->cob_inode
->i_mutex
));
547 cl_page_slice_add(page
, &cpg
->cpg_cl
, obj
,
548 &vvp_transient_page_ops
);
549 clobj
->cob_transient_pages
++;