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, Whamcloud, Inc.
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 cfs_page_t *vmpage = cp->cpg_page;
63 LASSERT(vmpage != NULL);
64 page_cache_release(vmpage);
65 OBD_SLAB_FREE_PTR(cp, vvp_page_kmem);
68 static void vvp_page_fini(const struct lu_env *env,
69 struct cl_page_slice *slice)
71 struct ccc_page *cp = cl2ccc_page(slice);
72 cfs_page_t *vmpage = cp->cpg_page;
75 * vmpage->private was already cleared when page was moved into
78 LASSERT((struct cl_page *)vmpage->private != slice->cpl_page);
79 vvp_page_fini_common(cp);
82 static int vvp_page_own(const struct lu_env *env,
83 const struct cl_page_slice *slice, struct cl_io *io,
86 struct ccc_page *vpg = cl2ccc_page(slice);
87 cfs_page_t *vmpage = vpg->cpg_page;
89 LASSERT(vmpage != NULL);
91 if (TestSetPageLocked(vmpage))
94 if (unlikely(PageWriteback(vmpage))) {
103 wait_on_page_writeback(vmpage);
107 static void vvp_page_assume(const struct lu_env *env,
108 const struct cl_page_slice *slice,
109 struct cl_io *unused)
111 cfs_page_t *vmpage = cl2vm_page(slice);
113 LASSERT(vmpage != NULL);
114 LASSERT(PageLocked(vmpage));
115 wait_on_page_writeback(vmpage);
118 static void vvp_page_unassume(const struct lu_env *env,
119 const struct cl_page_slice *slice,
120 struct cl_io *unused)
122 cfs_page_t *vmpage = cl2vm_page(slice);
124 LASSERT(vmpage != NULL);
125 LASSERT(PageLocked(vmpage));
128 static void vvp_page_disown(const struct lu_env *env,
129 const struct cl_page_slice *slice, struct cl_io *io)
131 cfs_page_t *vmpage = cl2vm_page(slice);
133 LASSERT(vmpage != NULL);
134 LASSERT(PageLocked(vmpage));
136 unlock_page(cl2vm_page(slice));
139 static void vvp_page_discard(const struct lu_env *env,
140 const struct cl_page_slice *slice,
141 struct cl_io *unused)
143 cfs_page_t *vmpage = cl2vm_page(slice);
144 struct address_space *mapping = vmpage->mapping;
145 struct ccc_page *cpg = cl2ccc_page(slice);
147 LASSERT(vmpage != NULL);
148 LASSERT(PageLocked(vmpage));
150 if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
151 ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
154 * truncate_complete_page() calls
155 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
157 truncate_complete_page(mapping, vmpage);
160 static int vvp_page_unmap(const struct lu_env *env,
161 const struct cl_page_slice *slice,
162 struct cl_io *unused)
164 cfs_page_t *vmpage = cl2vm_page(slice);
165 __u64 offset = vmpage->index << CFS_PAGE_SHIFT;
167 LASSERT(vmpage != NULL);
168 LASSERT(PageLocked(vmpage));
170 * XXX is it safe to call this with the page lock held?
172 ll_teardown_mmaps(vmpage->mapping, offset, offset + CFS_PAGE_SIZE);
176 static void vvp_page_delete(const struct lu_env *env,
177 const struct cl_page_slice *slice)
179 cfs_page_t *vmpage = cl2vm_page(slice);
180 struct inode *inode = vmpage->mapping->host;
181 struct cl_object *obj = slice->cpl_obj;
183 LASSERT(PageLocked(vmpage));
184 LASSERT((struct cl_page *)vmpage->private == slice->cpl_page);
185 LASSERT(inode == ccc_object_inode(obj));
187 vvp_write_complete(cl2ccc(obj), cl2ccc_page(slice));
188 ClearPagePrivate(vmpage);
191 * Reference from vmpage to cl_page is removed, but the reference back
192 * is still here. It is removed later in vvp_page_fini().
196 static void vvp_page_export(const struct lu_env *env,
197 const struct cl_page_slice *slice,
200 cfs_page_t *vmpage = cl2vm_page(slice);
202 LASSERT(vmpage != NULL);
203 LASSERT(PageLocked(vmpage));
205 SetPageUptodate(vmpage);
207 ClearPageUptodate(vmpage);
210 static int vvp_page_is_vmlocked(const struct lu_env *env,
211 const struct cl_page_slice *slice)
213 return PageLocked(cl2vm_page(slice)) ? -EBUSY : -ENODATA;
216 static int vvp_page_prep_read(const struct lu_env *env,
217 const struct cl_page_slice *slice,
218 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 cfs_page_t *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, cfs_page_t *vmpage, int ioret)
249 ClearPageError(vmpage);
250 else if (ioret != -EINTR) {
251 SetPageError(vmpage);
252 if (ioret == -ENOSPC)
253 set_bit(AS_ENOSPC, &inode->i_mapping->flags);
255 set_bit(AS_EIO, &inode->i_mapping->flags);
259 static void vvp_page_completion_read(const struct lu_env *env,
260 const struct cl_page_slice *slice,
263 struct ccc_page *cp = cl2ccc_page(slice);
264 cfs_page_t *vmpage = cp->cpg_page;
265 struct cl_page *page = cl_page_top(slice->cpl_page);
266 struct inode *inode = ccc_object_inode(page->cp_obj);
269 LASSERT(PageLocked(vmpage));
270 CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
272 if (cp->cpg_defer_uptodate)
273 ll_ra_count_put(ll_i2sbi(inode), 1);
276 if (!cp->cpg_defer_uptodate)
277 cl_page_export(env, page, 1);
279 cp->cpg_defer_uptodate = 0;
281 if (page->cp_sync_io == NULL)
287 static void vvp_page_completion_write(const struct lu_env *env,
288 const struct cl_page_slice *slice,
291 struct ccc_page *cp = cl2ccc_page(slice);
292 struct cl_page *pg = slice->cpl_page;
293 cfs_page_t *vmpage = cp->cpg_page;
296 LASSERT(ergo(pg->cp_sync_io != NULL, PageLocked(vmpage)));
297 LASSERT(PageWriteback(vmpage));
299 CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
302 * TODO: Actually it makes sense to add the page into oap pending
303 * list again and so that we don't need to take the page out from
304 * SoM write pending list, if we just meet a recoverable error,
306 * To implement this, we just need to return a non zero value in
307 * ->cpo_completion method. The underlying transfer should be notified
308 * and then re-add the page into pending transfer queue. -jay
311 cp->cpg_write_queued = 0;
312 vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
315 * Only mark the page error only when it's an async write because
316 * applications won't wait for IO to finish.
318 if (pg->cp_sync_io == NULL)
319 vvp_vmpage_error(ccc_object_inode(pg->cp_obj), vmpage, ioret);
321 end_page_writeback(vmpage);
326 * Implements cl_page_operations::cpo_make_ready() method.
328 * This is called to yank a page from the transfer cache and to send it out as
329 * a part of transfer. This function try-locks the page. If try-lock failed,
330 * page is owned by some concurrent IO, and should be skipped (this is bad,
331 * but hopefully rare situation, as it usually results in transfer being
332 * shorter than possible).
334 * \retval 0 success, page can be placed into transfer
336 * \retval -EAGAIN page is either used by concurrent IO has been
337 * truncated. Skip it.
339 static int vvp_page_make_ready(const struct lu_env *env,
340 const struct cl_page_slice *slice)
342 cfs_page_t *vmpage = cl2vm_page(slice);
343 struct cl_page *pg = slice->cpl_page;
347 if (clear_page_dirty_for_io(vmpage)) {
348 LASSERT(pg->cp_state == CPS_CACHED);
349 /* This actually clears the dirty bit in the radix
351 set_page_writeback(vmpage);
352 vvp_write_pending(cl2ccc(slice->cpl_obj),
354 CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
355 } else if (pg->cp_state == CPS_PAGEOUT) {
356 /* is it possible for osc_flush_async_page() to already
360 CL_PAGE_DEBUG(D_ERROR, env, pg, "Unexpecting page state %d.\n",
368 static int vvp_page_print(const struct lu_env *env,
369 const struct cl_page_slice *slice,
370 void *cookie, lu_printer_t printer)
372 struct ccc_page *vp = cl2ccc_page(slice);
373 cfs_page_t *vmpage = vp->cpg_page;
375 (*printer)(env, cookie, LUSTRE_VVP_NAME"-page@%p(%d:%d:%d) "
377 vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
378 vp->cpg_write_queued, vmpage);
379 if (vmpage != NULL) {
380 (*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
381 (long)vmpage->flags, page_count(vmpage),
382 page_mapcount(vmpage), vmpage->private,
384 list_empty(&vmpage->lru) ? "not-" : "");
386 (*printer)(env, cookie, "\n");
390 static const struct cl_page_operations vvp_page_ops = {
391 .cpo_own = vvp_page_own,
392 .cpo_assume = vvp_page_assume,
393 .cpo_unassume = vvp_page_unassume,
394 .cpo_disown = vvp_page_disown,
395 .cpo_vmpage = ccc_page_vmpage,
396 .cpo_discard = vvp_page_discard,
397 .cpo_delete = vvp_page_delete,
398 .cpo_unmap = vvp_page_unmap,
399 .cpo_export = vvp_page_export,
400 .cpo_is_vmlocked = vvp_page_is_vmlocked,
401 .cpo_fini = vvp_page_fini,
402 .cpo_print = vvp_page_print,
403 .cpo_is_under_lock = ccc_page_is_under_lock,
406 .cpo_prep = vvp_page_prep_read,
407 .cpo_completion = vvp_page_completion_read,
408 .cpo_make_ready = ccc_fail,
411 .cpo_prep = vvp_page_prep_write,
412 .cpo_completion = vvp_page_completion_write,
413 .cpo_make_ready = vvp_page_make_ready,
418 static void vvp_transient_page_verify(const struct cl_page *page)
420 struct inode *inode = ccc_object_inode(page->cp_obj);
422 LASSERT(!TRYLOCK_INODE_MUTEX(inode));
423 /* LASSERT_SEM_LOCKED(&inode->i_alloc_sem); */
426 static int vvp_transient_page_own(const struct lu_env *env,
427 const struct cl_page_slice *slice,
428 struct cl_io *unused, int nonblock)
430 vvp_transient_page_verify(slice->cpl_page);
434 static void vvp_transient_page_assume(const struct lu_env *env,
435 const struct cl_page_slice *slice,
436 struct cl_io *unused)
438 vvp_transient_page_verify(slice->cpl_page);
441 static void vvp_transient_page_unassume(const struct lu_env *env,
442 const struct cl_page_slice *slice,
443 struct cl_io *unused)
445 vvp_transient_page_verify(slice->cpl_page);
448 static void vvp_transient_page_disown(const struct lu_env *env,
449 const struct cl_page_slice *slice,
450 struct cl_io *unused)
452 vvp_transient_page_verify(slice->cpl_page);
455 static void vvp_transient_page_discard(const struct lu_env *env,
456 const struct cl_page_slice *slice,
457 struct cl_io *unused)
459 struct cl_page *page = slice->cpl_page;
461 vvp_transient_page_verify(slice->cpl_page);
464 * For transient pages, remove it from the radix tree.
466 cl_page_delete(env, page);
469 static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
470 const struct cl_page_slice *slice)
472 struct inode *inode = ccc_object_inode(slice->cpl_obj);
475 locked = !TRYLOCK_INODE_MUTEX(inode);
477 UNLOCK_INODE_MUTEX(inode);
478 return locked ? -EBUSY : -ENODATA;
482 vvp_transient_page_completion(const struct lu_env *env,
483 const struct cl_page_slice *slice,
486 vvp_transient_page_verify(slice->cpl_page);
489 static void vvp_transient_page_fini(const struct lu_env *env,
490 struct cl_page_slice *slice)
492 struct ccc_page *cp = cl2ccc_page(slice);
493 struct cl_page *clp = slice->cpl_page;
494 struct ccc_object *clobj = cl2ccc(clp->cp_obj);
496 vvp_page_fini_common(cp);
497 LASSERT(!TRYLOCK_INODE_MUTEX(clobj->cob_inode));
498 clobj->cob_transient_pages--;
501 static const struct cl_page_operations vvp_transient_page_ops = {
502 .cpo_own = vvp_transient_page_own,
503 .cpo_assume = vvp_transient_page_assume,
504 .cpo_unassume = vvp_transient_page_unassume,
505 .cpo_disown = vvp_transient_page_disown,
506 .cpo_discard = vvp_transient_page_discard,
507 .cpo_vmpage = ccc_page_vmpage,
508 .cpo_fini = vvp_transient_page_fini,
509 .cpo_is_vmlocked = vvp_transient_page_is_vmlocked,
510 .cpo_print = vvp_page_print,
511 .cpo_is_under_lock = ccc_page_is_under_lock,
514 .cpo_prep = ccc_transient_page_prep,
515 .cpo_completion = vvp_transient_page_completion,
518 .cpo_prep = ccc_transient_page_prep,
519 .cpo_completion = vvp_transient_page_completion,
524 struct cl_page *vvp_page_init(const struct lu_env *env, struct cl_object *obj,
525 struct cl_page *page, cfs_page_t *vmpage)
527 struct ccc_page *cpg;
530 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
532 OBD_SLAB_ALLOC_PTR_GFP(cpg, vvp_page_kmem, CFS_ALLOC_IO);
534 cpg->cpg_page = vmpage;
535 page_cache_get(vmpage);
537 CFS_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(!TRYLOCK_INODE_MUTEX(clobj->cob_inode));
547 cl_page_slice_add(page, &cpg->cpg_cl, obj,
548 &vvp_transient_page_ops);
549 clobj->cob_transient_pages++;
554 return ERR_PTR(result);