1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
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>
41 #define DEBUG_SUBSYSTEM S_LLITE
44 # error This file is kernel only.
48 #include <lustre_lite.h>
50 #include "vvp_internal.h"
52 /*****************************************************************************
58 static void vvp_page_fini_common(struct ccc_page *cp)
60 cfs_page_t *vmpage = cp->cpg_page;
62 LASSERT(vmpage != NULL);
63 page_cache_release(vmpage);
64 OBD_SLAB_FREE_PTR(cp, vvp_page_kmem);
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 cfs_page_t *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 cfs_page_t *vmpage = vpg->cpg_page;
88 LASSERT(vmpage != NULL);
90 if (TestSetPageLocked(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 cfs_page_t *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 cfs_page_t *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 cfs_page_t *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 cfs_page_t *vmpage = cl2vm_page(slice);
143 struct address_space *mapping = vmpage->mapping;
144 struct ccc_page *cpg = cl2ccc_page(slice);
146 LASSERT(vmpage != NULL);
147 LASSERT(PageLocked(vmpage));
149 if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
150 ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
153 * truncate_complete_page() calls
154 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
156 truncate_complete_page(mapping, vmpage);
159 static int vvp_page_unmap(const struct lu_env *env,
160 const struct cl_page_slice *slice,
161 struct cl_io *unused)
163 cfs_page_t *vmpage = cl2vm_page(slice);
164 __u64 offset = vmpage->index << CFS_PAGE_SHIFT;
166 LASSERT(vmpage != NULL);
167 LASSERT(PageLocked(vmpage));
169 * XXX is it safe to call this with the page lock held?
171 ll_teardown_mmaps(vmpage->mapping, offset, offset + CFS_PAGE_SIZE);
175 static void vvp_page_delete(const struct lu_env *env,
176 const struct cl_page_slice *slice)
178 cfs_page_t *vmpage = cl2vm_page(slice);
179 struct inode *inode = vmpage->mapping->host;
180 struct cl_object *obj = slice->cpl_obj;
182 LASSERT(PageLocked(vmpage));
183 LASSERT((struct cl_page *)vmpage->private == slice->cpl_page);
184 LASSERT(inode == ccc_object_inode(obj));
186 vvp_write_complete(cl2ccc(obj), cl2ccc_page(slice));
187 ClearPagePrivate(vmpage);
190 * Reference from vmpage to cl_page is removed, but the reference back
191 * is still here. It is removed later in vvp_page_fini().
195 static void vvp_page_export(const struct lu_env *env,
196 const struct cl_page_slice *slice,
199 cfs_page_t *vmpage = cl2vm_page(slice);
201 LASSERT(vmpage != NULL);
202 LASSERT(PageLocked(vmpage));
204 SetPageUptodate(vmpage);
206 ClearPageUptodate(vmpage);
209 static int vvp_page_is_vmlocked(const struct lu_env *env,
210 const struct cl_page_slice *slice)
212 return PageLocked(cl2vm_page(slice)) ? -EBUSY : -ENODATA;
215 static int vvp_page_prep_read(const struct lu_env *env,
216 const struct cl_page_slice *slice,
217 struct cl_io *unused)
220 /* Skip the page already marked as PG_uptodate. */
221 RETURN(PageUptodate(cl2vm_page(slice)) ? -EALREADY : 0);
224 static int vvp_page_prep_write(const struct lu_env *env,
225 const struct cl_page_slice *slice,
226 struct cl_io *unused)
228 cfs_page_t *vmpage = cl2vm_page(slice);
231 if (clear_page_dirty_for_io(vmpage)) {
232 set_page_writeback(vmpage);
233 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_common(const struct lu_env *env,
260 struct ccc_page *cp, int ioret)
262 struct cl_page *clp = cp->cpg_cl.cpl_page;
263 cfs_page_t *vmpage = cp->cpg_page;
264 struct inode *inode = ccc_object_inode(clp->cp_obj);
266 LINVRNT(cl_page_is_vmlocked(env, clp));
268 if (!clp->cp_sync_io && clp->cp_type == CPT_CACHEABLE) {
270 * Only mark the page error only when it's a cacheable page
273 * For sync IO and direct IO(CPT_TRANSIENT), the error is able
274 * to be seen by application, so we don't need to mark a page
277 vvp_vmpage_error(inode, vmpage, ioret);
282 static void vvp_page_completion_read(const struct lu_env *env,
283 const struct cl_page_slice *slice,
286 struct ccc_page *cp = cl2ccc_page(slice);
287 struct cl_page *page = cl_page_top(slice->cpl_page);
288 struct inode *inode = ccc_object_inode(page->cp_obj);
291 CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
293 if (cp->cpg_defer_uptodate)
294 ll_ra_count_put(ll_i2sbi(inode), 1);
297 /* XXX: do we need this for transient pages? */
298 if (!cp->cpg_defer_uptodate)
299 cl_page_export(env, page, 1);
301 cp->cpg_defer_uptodate = 0;
302 vvp_page_completion_common(env, cp, ioret);
307 static void vvp_page_completion_write_common(const struct lu_env *env,
308 const struct cl_page_slice *slice,
311 struct ccc_page *cp = cl2ccc_page(slice);
314 * TODO: Actually it makes sense to add the page into oap pending
315 * list again and so that we don't need to take the page out from
316 * SoM write pending list, if we just meet a recoverable error,
318 * To implement this, we just need to return a non zero value in
319 * ->cpo_completion method. The underlying transfer should be notified
320 * and then re-add the page into pending transfer queue. -jay
322 cp->cpg_write_queued = 0;
323 vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
325 vvp_page_completion_common(env, cp, ioret);
328 static void vvp_page_completion_write(const struct lu_env *env,
329 const struct cl_page_slice *slice,
332 struct ccc_page *cp = cl2ccc_page(slice);
333 struct cl_page *pg = slice->cpl_page;
334 cfs_page_t *vmpage = cp->cpg_page;
338 LINVRNT(cl_page_is_vmlocked(env, pg));
339 LASSERT(PageWriteback(vmpage));
341 CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
343 vvp_page_completion_write_common(env, slice, ioret);
344 end_page_writeback(vmpage);
349 * Implements cl_page_operations::cpo_make_ready() method.
351 * This is called to yank a page from the transfer cache and to send it out as
352 * a part of transfer. This function try-locks the page. If try-lock failed,
353 * page is owned by some concurrent IO, and should be skipped (this is bad,
354 * but hopefully rare situation, as it usually results in transfer being
355 * shorter than possible).
357 * \retval 0 success, page can be placed into transfer
359 * \retval -EAGAIN page is either used by concurrent IO has been
360 * truncated. Skip it.
362 static int vvp_page_make_ready(const struct lu_env *env,
363 const struct cl_page_slice *slice)
365 cfs_page_t *vmpage = cl2vm_page(slice);
366 struct cl_page *pg = slice->cpl_page;
370 /* we're trying to write, but the page is locked.. come back later */
371 if (!TestSetPageLocked(vmpage)) {
372 if (pg->cp_state == CPS_CACHED) {
374 * We can cancel IO if page wasn't dirty after all.
376 clear_page_dirty_for_io(vmpage);
378 * This actually clears the dirty bit in the radix
381 set_page_writeback(vmpage);
382 vvp_write_pending(cl2ccc(slice->cpl_obj),
384 CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
388 * Page was concurrently truncated.
390 LASSERT(pg->cp_state == CPS_FREEING);
395 static int vvp_page_print(const struct lu_env *env,
396 const struct cl_page_slice *slice,
397 void *cookie, lu_printer_t printer)
399 struct ccc_page *vp = cl2ccc_page(slice);
400 cfs_page_t *vmpage = vp->cpg_page;
402 (*printer)(env, cookie, LUSTRE_VVP_NAME"-page@%p(%d:%d:%d) "
404 vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
405 vp->cpg_write_queued, vmpage);
406 if (vmpage != NULL) {
407 (*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
408 (long)vmpage->flags, page_count(vmpage),
409 page_mapcount(vmpage), vmpage->private,
411 list_empty(&vmpage->lru) ? "not-" : "");
413 (*printer)(env, cookie, "\n");
417 static const struct cl_page_operations vvp_page_ops = {
418 .cpo_own = vvp_page_own,
419 .cpo_assume = vvp_page_assume,
420 .cpo_unassume = vvp_page_unassume,
421 .cpo_disown = vvp_page_disown,
422 .cpo_vmpage = ccc_page_vmpage,
423 .cpo_discard = vvp_page_discard,
424 .cpo_delete = vvp_page_delete,
425 .cpo_unmap = vvp_page_unmap,
426 .cpo_export = vvp_page_export,
427 .cpo_is_vmlocked = vvp_page_is_vmlocked,
428 .cpo_fini = vvp_page_fini,
429 .cpo_print = vvp_page_print,
430 .cpo_is_under_lock = ccc_page_is_under_lock,
433 .cpo_prep = vvp_page_prep_read,
434 .cpo_completion = vvp_page_completion_read,
435 .cpo_make_ready = ccc_fail,
438 .cpo_prep = vvp_page_prep_write,
439 .cpo_completion = vvp_page_completion_write,
440 .cpo_make_ready = vvp_page_make_ready,
445 static void vvp_transient_page_verify(const struct cl_page *page)
447 struct inode *inode = ccc_object_inode(page->cp_obj);
449 LASSERT(!TRYLOCK_INODE_MUTEX(inode));
450 /* LASSERT_SEM_LOCKED(&inode->i_alloc_sem); */
453 static int vvp_transient_page_own(const struct lu_env *env,
454 const struct cl_page_slice *slice,
455 struct cl_io *unused, int nonblock)
457 vvp_transient_page_verify(slice->cpl_page);
461 static void vvp_transient_page_assume(const struct lu_env *env,
462 const struct cl_page_slice *slice,
463 struct cl_io *unused)
465 vvp_transient_page_verify(slice->cpl_page);
468 static void vvp_transient_page_unassume(const struct lu_env *env,
469 const struct cl_page_slice *slice,
470 struct cl_io *unused)
472 vvp_transient_page_verify(slice->cpl_page);
475 static void vvp_transient_page_disown(const struct lu_env *env,
476 const struct cl_page_slice *slice,
477 struct cl_io *unused)
479 vvp_transient_page_verify(slice->cpl_page);
482 static void vvp_transient_page_discard(const struct lu_env *env,
483 const struct cl_page_slice *slice,
484 struct cl_io *unused)
486 struct cl_page *page = slice->cpl_page;
488 vvp_transient_page_verify(slice->cpl_page);
491 * For transient pages, remove it from the radix tree.
493 cl_page_delete(env, page);
496 static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
497 const struct cl_page_slice *slice)
499 struct inode *inode = ccc_object_inode(slice->cpl_obj);
502 locked = !TRYLOCK_INODE_MUTEX(inode);
504 UNLOCK_INODE_MUTEX(inode);
505 return locked ? -EBUSY : -ENODATA;
509 vvp_transient_page_completion_write(const struct lu_env *env,
510 const struct cl_page_slice *slice,
513 vvp_transient_page_verify(slice->cpl_page);
514 vvp_page_completion_write_common(env, slice, ioret);
518 static void vvp_transient_page_fini(const struct lu_env *env,
519 struct cl_page_slice *slice)
521 struct ccc_page *cp = cl2ccc_page(slice);
522 struct cl_page *clp = slice->cpl_page;
523 struct ccc_object *clobj = cl2ccc(clp->cp_obj);
525 vvp_page_fini_common(cp);
526 LASSERT(!TRYLOCK_INODE_MUTEX(clobj->cob_inode));
527 clobj->cob_transient_pages--;
530 static const struct cl_page_operations vvp_transient_page_ops = {
531 .cpo_own = vvp_transient_page_own,
532 .cpo_assume = vvp_transient_page_assume,
533 .cpo_unassume = vvp_transient_page_unassume,
534 .cpo_disown = vvp_transient_page_disown,
535 .cpo_discard = vvp_transient_page_discard,
536 .cpo_vmpage = ccc_page_vmpage,
537 .cpo_fini = vvp_transient_page_fini,
538 .cpo_is_vmlocked = vvp_transient_page_is_vmlocked,
539 .cpo_print = vvp_page_print,
540 .cpo_is_under_lock = ccc_page_is_under_lock,
543 .cpo_prep = ccc_transient_page_prep,
544 .cpo_completion = vvp_page_completion_read,
547 .cpo_prep = ccc_transient_page_prep,
548 .cpo_completion = vvp_transient_page_completion_write,
553 struct cl_page *vvp_page_init(const struct lu_env *env, struct cl_object *obj,
554 struct cl_page *page, cfs_page_t *vmpage)
556 struct ccc_page *cpg;
559 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
561 OBD_SLAB_ALLOC_PTR_GFP(cpg, vvp_page_kmem, CFS_ALLOC_IO);
563 cpg->cpg_page = vmpage;
564 page_cache_get(vmpage);
566 CFS_INIT_LIST_HEAD(&cpg->cpg_pending_linkage);
567 if (page->cp_type == CPT_CACHEABLE) {
568 SetPagePrivate(vmpage);
569 vmpage->private = (unsigned long)page;
570 cl_page_slice_add(page, &cpg->cpg_cl, obj,
573 struct ccc_object *clobj = cl2ccc(obj);
575 LASSERT(!TRYLOCK_INODE_MUTEX(clobj->cob_inode));
576 cl_page_slice_add(page, &cpg->cpg_cl, obj,
577 &vvp_transient_page_ops);
578 clobj->cob_transient_pages++;
583 return ERR_PTR(result);