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,
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10 * This program is distributed in the hope that it will be useful, but
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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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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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, 2013, 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 # error This file is kernel only.
49 #include <lustre_lite.h>
51 #include "vvp_internal.h"
53 /*****************************************************************************
59 static void vvp_page_fini_common(struct ccc_page *cp)
61 struct page *vmpage = cp->cpg_page;
63 LASSERT(vmpage != NULL);
64 page_cache_release(vmpage);
67 static void vvp_page_fini(const struct lu_env *env,
68 struct cl_page_slice *slice)
70 struct ccc_page *cp = cl2ccc_page(slice);
71 struct page *vmpage = cp->cpg_page;
74 * vmpage->private was already cleared when page was moved into
77 LASSERT((struct cl_page *)vmpage->private != slice->cpl_page);
78 vvp_page_fini_common(cp);
81 static int vvp_page_own(const struct lu_env *env,
82 const struct cl_page_slice *slice, struct cl_io *io,
85 struct ccc_page *vpg = cl2ccc_page(slice);
86 struct page *vmpage = vpg->cpg_page;
88 LASSERT(vmpage != NULL);
90 if (!trylock_page(vmpage))
93 if (unlikely(PageWriteback(vmpage))) {
102 wait_on_page_writeback(vmpage);
106 static void vvp_page_assume(const struct lu_env *env,
107 const struct cl_page_slice *slice,
108 struct cl_io *unused)
110 struct page *vmpage = cl2vm_page(slice);
112 LASSERT(vmpage != NULL);
113 LASSERT(PageLocked(vmpage));
114 wait_on_page_writeback(vmpage);
117 static void vvp_page_unassume(const struct lu_env *env,
118 const struct cl_page_slice *slice,
119 struct cl_io *unused)
121 struct page *vmpage = cl2vm_page(slice);
123 LASSERT(vmpage != NULL);
124 LASSERT(PageLocked(vmpage));
127 static void vvp_page_disown(const struct lu_env *env,
128 const struct cl_page_slice *slice, struct cl_io *io)
130 struct page *vmpage = cl2vm_page(slice);
132 LASSERT(vmpage != NULL);
133 LASSERT(PageLocked(vmpage));
135 unlock_page(cl2vm_page(slice));
138 static void vvp_page_discard(const struct lu_env *env,
139 const struct cl_page_slice *slice,
140 struct cl_io *unused)
142 struct page *vmpage = cl2vm_page(slice);
143 struct address_space *mapping;
144 struct ccc_page *cpg = cl2ccc_page(slice);
146 LASSERT(vmpage != NULL);
147 LASSERT(PageLocked(vmpage));
149 mapping = vmpage->mapping;
151 if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
152 ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
155 * truncate_complete_page() calls
156 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
158 truncate_complete_page(mapping, vmpage);
161 static int vvp_page_unmap(const struct lu_env *env,
162 const struct cl_page_slice *slice,
163 struct cl_io *unused)
165 struct page *vmpage = cl2vm_page(slice);
168 LASSERT(vmpage != NULL);
169 LASSERT(PageLocked(vmpage));
171 offset = vmpage->index << PAGE_CACHE_SHIFT;
174 * XXX is it safe to call this with the page lock held?
176 ll_teardown_mmaps(vmpage->mapping, offset, offset + PAGE_CACHE_SIZE);
180 static void vvp_page_delete(const struct lu_env *env,
181 const struct cl_page_slice *slice)
183 struct page *vmpage = cl2vm_page(slice);
184 struct inode *inode = vmpage->mapping->host;
185 struct cl_object *obj = slice->cpl_obj;
187 LASSERT(PageLocked(vmpage));
188 LASSERT((struct cl_page *)vmpage->private == slice->cpl_page);
189 LASSERT(inode == ccc_object_inode(obj));
191 vvp_write_complete(cl2ccc(obj), cl2ccc_page(slice));
192 ClearPagePrivate(vmpage);
195 * Reference from vmpage to cl_page is removed, but the reference back
196 * is still here. It is removed later in vvp_page_fini().
200 static void vvp_page_export(const struct lu_env *env,
201 const struct cl_page_slice *slice,
204 struct page *vmpage = cl2vm_page(slice);
206 LASSERT(vmpage != NULL);
207 LASSERT(PageLocked(vmpage));
209 SetPageUptodate(vmpage);
211 ClearPageUptodate(vmpage);
214 static int vvp_page_is_vmlocked(const struct lu_env *env,
215 const struct cl_page_slice *slice)
217 return PageLocked(cl2vm_page(slice)) ? -EBUSY : -ENODATA;
220 static int vvp_page_prep_read(const struct lu_env *env,
221 const struct cl_page_slice *slice,
222 struct cl_io *unused)
225 /* Skip the page already marked as PG_uptodate. */
226 RETURN(PageUptodate(cl2vm_page(slice)) ? -EALREADY : 0);
229 static int vvp_page_prep_write(const struct lu_env *env,
230 const struct cl_page_slice *slice,
231 struct cl_io *unused)
233 struct page *vmpage = cl2vm_page(slice);
235 LASSERT(PageLocked(vmpage));
236 LASSERT(!PageDirty(vmpage));
238 set_page_writeback(vmpage);
239 vvp_write_pending(cl2ccc(slice->cpl_obj), cl2ccc_page(slice));
245 * Handles page transfer errors at VM level.
247 * This takes inode as a separate argument, because inode on which error is to
248 * be set can be different from \a vmpage inode in case of direct-io.
250 static void vvp_vmpage_error(struct inode *inode, struct page *vmpage, int ioret)
252 struct ccc_object *obj = cl_inode2ccc(inode);
255 ClearPageError(vmpage);
256 obj->cob_discard_page_warned = 0;
258 SetPageError(vmpage);
259 if (ioret == -ENOSPC)
260 set_bit(AS_ENOSPC, &inode->i_mapping->flags);
262 set_bit(AS_EIO, &inode->i_mapping->flags);
264 if ((ioret == -ESHUTDOWN || ioret == -EINTR) &&
265 obj->cob_discard_page_warned == 0) {
266 obj->cob_discard_page_warned = 1;
267 ll_dirty_page_discard_warn(vmpage, ioret);
272 static void vvp_page_completion_read(const struct lu_env *env,
273 const struct cl_page_slice *slice,
276 struct ccc_page *cp = cl2ccc_page(slice);
277 struct page *vmpage = cp->cpg_page;
278 struct cl_page *page = cl_page_top(slice->cpl_page);
279 struct inode *inode = ccc_object_inode(page->cp_obj);
282 LASSERT(PageLocked(vmpage));
283 CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
285 if (cp->cpg_defer_uptodate)
286 ll_ra_count_put(ll_i2sbi(inode), 1);
289 if (!cp->cpg_defer_uptodate)
290 cl_page_export(env, page, 1);
292 cp->cpg_defer_uptodate = 0;
294 if (page->cp_sync_io == NULL)
300 static void vvp_page_completion_write(const struct lu_env *env,
301 const struct cl_page_slice *slice,
304 struct ccc_page *cp = cl2ccc_page(slice);
305 struct cl_page *pg = slice->cpl_page;
306 struct page *vmpage = cp->cpg_page;
309 LASSERT(ergo(pg->cp_sync_io != NULL, PageLocked(vmpage)));
310 LASSERT(PageWriteback(vmpage));
312 CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
315 * TODO: Actually it makes sense to add the page into oap pending
316 * list again and so that we don't need to take the page out from
317 * SoM write pending list, if we just meet a recoverable error,
319 * To implement this, we just need to return a non zero value in
320 * ->cpo_completion method. The underlying transfer should be notified
321 * and then re-add the page into pending transfer queue. -jay
324 cp->cpg_write_queued = 0;
325 vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
328 * Only mark the page error only when it's an async write because
329 * applications won't wait for IO to finish.
331 if (pg->cp_sync_io == NULL)
332 vvp_vmpage_error(ccc_object_inode(pg->cp_obj), vmpage, ioret);
334 end_page_writeback(vmpage);
339 * Implements cl_page_operations::cpo_make_ready() method.
341 * This is called to yank a page from the transfer cache and to send it out as
342 * a part of transfer. This function try-locks the page. If try-lock failed,
343 * page is owned by some concurrent IO, and should be skipped (this is bad,
344 * but hopefully rare situation, as it usually results in transfer being
345 * shorter than possible).
347 * \retval 0 success, page can be placed into transfer
349 * \retval -EAGAIN page is either used by concurrent IO has been
350 * truncated. Skip it.
352 static int vvp_page_make_ready(const struct lu_env *env,
353 const struct cl_page_slice *slice)
355 struct page *vmpage = cl2vm_page(slice);
356 struct cl_page *pg = slice->cpl_page;
360 if (clear_page_dirty_for_io(vmpage)) {
361 LASSERT(pg->cp_state == CPS_CACHED);
362 /* This actually clears the dirty bit in the radix
364 set_page_writeback(vmpage);
365 vvp_write_pending(cl2ccc(slice->cpl_obj),
367 CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
368 } else if (pg->cp_state == CPS_PAGEOUT) {
369 /* is it possible for osc_flush_async_page() to already
373 CL_PAGE_DEBUG(D_ERROR, env, pg, "Unexpecting page state %d.\n",
381 static int vvp_page_print(const struct lu_env *env,
382 const struct cl_page_slice *slice,
383 void *cookie, lu_printer_t printer)
385 struct ccc_page *vp = cl2ccc_page(slice);
386 struct page *vmpage = vp->cpg_page;
388 (*printer)(env, cookie, LUSTRE_VVP_NAME"-page@%p(%d:%d:%d) "
390 vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
391 vp->cpg_write_queued, vmpage);
392 if (vmpage != NULL) {
393 (*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
394 (long)vmpage->flags, page_count(vmpage),
395 page_mapcount(vmpage), vmpage->private,
397 list_empty(&vmpage->lru) ? "not-" : "");
399 (*printer)(env, cookie, "\n");
403 static const struct cl_page_operations vvp_page_ops = {
404 .cpo_own = vvp_page_own,
405 .cpo_assume = vvp_page_assume,
406 .cpo_unassume = vvp_page_unassume,
407 .cpo_disown = vvp_page_disown,
408 .cpo_vmpage = ccc_page_vmpage,
409 .cpo_discard = vvp_page_discard,
410 .cpo_delete = vvp_page_delete,
411 .cpo_unmap = vvp_page_unmap,
412 .cpo_export = vvp_page_export,
413 .cpo_is_vmlocked = vvp_page_is_vmlocked,
414 .cpo_fini = vvp_page_fini,
415 .cpo_print = vvp_page_print,
416 .cpo_is_under_lock = ccc_page_is_under_lock,
419 .cpo_prep = vvp_page_prep_read,
420 .cpo_completion = vvp_page_completion_read,
421 .cpo_make_ready = ccc_fail,
424 .cpo_prep = vvp_page_prep_write,
425 .cpo_completion = vvp_page_completion_write,
426 .cpo_make_ready = vvp_page_make_ready,
431 static void vvp_transient_page_verify(const struct cl_page *page)
433 struct inode *inode = ccc_object_inode(page->cp_obj);
435 LASSERT(!mutex_trylock(&inode->i_mutex));
438 static int vvp_transient_page_own(const struct lu_env *env,
439 const struct cl_page_slice *slice,
440 struct cl_io *unused, int nonblock)
442 vvp_transient_page_verify(slice->cpl_page);
446 static void vvp_transient_page_assume(const struct lu_env *env,
447 const struct cl_page_slice *slice,
448 struct cl_io *unused)
450 vvp_transient_page_verify(slice->cpl_page);
453 static void vvp_transient_page_unassume(const struct lu_env *env,
454 const struct cl_page_slice *slice,
455 struct cl_io *unused)
457 vvp_transient_page_verify(slice->cpl_page);
460 static void vvp_transient_page_disown(const struct lu_env *env,
461 const struct cl_page_slice *slice,
462 struct cl_io *unused)
464 vvp_transient_page_verify(slice->cpl_page);
467 static void vvp_transient_page_discard(const struct lu_env *env,
468 const struct cl_page_slice *slice,
469 struct cl_io *unused)
471 struct cl_page *page = slice->cpl_page;
473 vvp_transient_page_verify(slice->cpl_page);
476 * For transient pages, remove it from the radix tree.
478 cl_page_delete(env, page);
481 static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
482 const struct cl_page_slice *slice)
484 struct inode *inode = ccc_object_inode(slice->cpl_obj);
487 locked = !mutex_trylock(&inode->i_mutex);
489 mutex_unlock(&inode->i_mutex);
490 return locked ? -EBUSY : -ENODATA;
494 vvp_transient_page_completion(const struct lu_env *env,
495 const struct cl_page_slice *slice,
498 vvp_transient_page_verify(slice->cpl_page);
501 static void vvp_transient_page_fini(const struct lu_env *env,
502 struct cl_page_slice *slice)
504 struct ccc_page *cp = cl2ccc_page(slice);
505 struct cl_page *clp = slice->cpl_page;
506 struct ccc_object *clobj = cl2ccc(clp->cp_obj);
508 vvp_page_fini_common(cp);
509 LASSERT(!mutex_trylock(&clobj->cob_inode->i_mutex));
510 clobj->cob_transient_pages--;
513 static const struct cl_page_operations vvp_transient_page_ops = {
514 .cpo_own = vvp_transient_page_own,
515 .cpo_assume = vvp_transient_page_assume,
516 .cpo_unassume = vvp_transient_page_unassume,
517 .cpo_disown = vvp_transient_page_disown,
518 .cpo_discard = vvp_transient_page_discard,
519 .cpo_vmpage = ccc_page_vmpage,
520 .cpo_fini = vvp_transient_page_fini,
521 .cpo_is_vmlocked = vvp_transient_page_is_vmlocked,
522 .cpo_print = vvp_page_print,
523 .cpo_is_under_lock = ccc_page_is_under_lock,
526 .cpo_prep = ccc_transient_page_prep,
527 .cpo_completion = vvp_transient_page_completion,
530 .cpo_prep = ccc_transient_page_prep,
531 .cpo_completion = vvp_transient_page_completion,
536 int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
537 struct cl_page *page, struct page *vmpage)
539 struct ccc_page *cpg = cl_object_page_slice(obj, page);
541 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
543 cpg->cpg_page = vmpage;
544 page_cache_get(vmpage);
546 CFS_INIT_LIST_HEAD(&cpg->cpg_pending_linkage);
547 if (page->cp_type == CPT_CACHEABLE) {
548 SetPagePrivate(vmpage);
549 vmpage->private = (unsigned long)page;
550 cl_page_slice_add(page, &cpg->cpg_cl, obj,
553 struct ccc_object *clobj = cl2ccc(obj);
555 LASSERT(!mutex_trylock(&clobj->cob_inode->i_mutex));
556 cl_page_slice_add(page, &cpg->cpg_cl, obj,
557 &vvp_transient_page_ops);
558 clobj->cob_transient_pages++;