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7 * it under the terms of the GNU General Public License version 2 only,
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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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
46 #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++;