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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, 2015, 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
44 #include "../include/obd.h"
45 #include "../include/lustre_lite.h"
47 #include "vvp_internal.h"
49 /*****************************************************************************
55 static void vvp_page_fini_common(struct ccc_page *cp)
57 struct page *vmpage = cp->cpg_page;
59 LASSERT(vmpage != NULL);
60 page_cache_release(vmpage);
63 static void vvp_page_fini(const struct lu_env *env,
64 struct cl_page_slice *slice)
66 struct ccc_page *cp = cl2ccc_page(slice);
67 struct page *vmpage = cp->cpg_page;
70 * vmpage->private was already cleared when page was moved into
73 LASSERT((struct cl_page *)vmpage->private != slice->cpl_page);
74 vvp_page_fini_common(cp);
77 static int vvp_page_own(const struct lu_env *env,
78 const struct cl_page_slice *slice, struct cl_io *io,
81 struct ccc_page *vpg = cl2ccc_page(slice);
82 struct page *vmpage = vpg->cpg_page;
84 LASSERT(vmpage != NULL);
86 if (!trylock_page(vmpage))
89 if (unlikely(PageWriteback(vmpage))) {
98 wait_on_page_writeback(vmpage);
102 static void vvp_page_assume(const struct lu_env *env,
103 const struct cl_page_slice *slice,
104 struct cl_io *unused)
106 struct page *vmpage = cl2vm_page(slice);
108 LASSERT(vmpage != NULL);
109 LASSERT(PageLocked(vmpage));
110 wait_on_page_writeback(vmpage);
113 static void vvp_page_unassume(const struct lu_env *env,
114 const struct cl_page_slice *slice,
115 struct cl_io *unused)
117 struct page *vmpage = cl2vm_page(slice);
119 LASSERT(vmpage != NULL);
120 LASSERT(PageLocked(vmpage));
123 static void vvp_page_disown(const struct lu_env *env,
124 const struct cl_page_slice *slice, struct cl_io *io)
126 struct page *vmpage = cl2vm_page(slice);
128 LASSERT(vmpage != NULL);
129 LASSERT(PageLocked(vmpage));
131 unlock_page(cl2vm_page(slice));
134 static void vvp_page_discard(const struct lu_env *env,
135 const struct cl_page_slice *slice,
136 struct cl_io *unused)
138 struct page *vmpage = cl2vm_page(slice);
139 struct address_space *mapping;
140 struct ccc_page *cpg = cl2ccc_page(slice);
142 LASSERT(vmpage != NULL);
143 LASSERT(PageLocked(vmpage));
145 mapping = vmpage->mapping;
147 if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
148 ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
151 * truncate_complete_page() calls
152 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
154 truncate_complete_page(mapping, vmpage);
157 static int vvp_page_unmap(const struct lu_env *env,
158 const struct cl_page_slice *slice,
159 struct cl_io *unused)
161 struct page *vmpage = cl2vm_page(slice);
164 LASSERT(vmpage != NULL);
165 LASSERT(PageLocked(vmpage));
167 offset = vmpage->index << PAGE_CACHE_SHIFT;
170 * XXX is it safe to call this with the page lock held?
172 ll_teardown_mmaps(vmpage->mapping, offset, offset + PAGE_CACHE_SIZE);
176 static void vvp_page_delete(const struct lu_env *env,
177 const struct cl_page_slice *slice)
179 struct page *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 struct page *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)
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 struct page *vmpage = cl2vm_page(slice);
229 struct cl_page *pg = slice->cpl_page;
231 LASSERT(PageLocked(vmpage));
232 LASSERT(!PageDirty(vmpage));
234 /* ll_writepage path is not a sync write, so need to set page writeback
237 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);
281 LASSERT(PageLocked(vmpage));
282 CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
284 if (cp->cpg_defer_uptodate)
285 ll_ra_count_put(ll_i2sbi(inode), 1);
288 if (!cp->cpg_defer_uptodate)
289 cl_page_export(env, page, 1);
291 cp->cpg_defer_uptodate = 0;
293 if (page->cp_sync_io == NULL)
297 static void vvp_page_completion_write(const struct lu_env *env,
298 const struct cl_page_slice *slice,
301 struct ccc_page *cp = cl2ccc_page(slice);
302 struct cl_page *pg = slice->cpl_page;
303 struct page *vmpage = cp->cpg_page;
305 CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
308 * TODO: Actually it makes sense to add the page into oap pending
309 * list again and so that we don't need to take the page out from
310 * SoM write pending list, if we just meet a recoverable error,
312 * To implement this, we just need to return a non zero value in
313 * ->cpo_completion method. The underlying transfer should be notified
314 * and then re-add the page into pending transfer queue. -jay
317 cp->cpg_write_queued = 0;
318 vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
320 if (pg->cp_sync_io != NULL) {
321 LASSERT(PageLocked(vmpage));
322 LASSERT(!PageWriteback(vmpage));
324 LASSERT(PageWriteback(vmpage));
326 * Only mark the page error only when it's an async write
327 * because applications won't wait for IO to finish.
329 vvp_vmpage_error(ccc_object_inode(pg->cp_obj), vmpage, ioret);
331 end_page_writeback(vmpage);
336 * Implements cl_page_operations::cpo_make_ready() method.
338 * This is called to yank a page from the transfer cache and to send it out as
339 * a part of transfer. This function try-locks the page. If try-lock failed,
340 * page is owned by some concurrent IO, and should be skipped (this is bad,
341 * but hopefully rare situation, as it usually results in transfer being
342 * shorter than possible).
344 * \retval 0 success, page can be placed into transfer
346 * \retval -EAGAIN page is either used by concurrent IO has been
347 * truncated. Skip it.
349 static int vvp_page_make_ready(const struct lu_env *env,
350 const struct cl_page_slice *slice)
352 struct page *vmpage = cl2vm_page(slice);
353 struct cl_page *pg = slice->cpl_page;
357 if (clear_page_dirty_for_io(vmpage)) {
358 LASSERT(pg->cp_state == CPS_CACHED);
359 /* This actually clears the dirty bit in the radix
361 set_page_writeback(vmpage);
362 vvp_write_pending(cl2ccc(slice->cpl_obj),
364 CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
365 } else if (pg->cp_state == CPS_PAGEOUT) {
366 /* is it possible for osc_flush_async_page() to already
370 CL_PAGE_DEBUG(D_ERROR, env, pg, "Unexpecting page state %d.\n",
378 static int vvp_page_print(const struct lu_env *env,
379 const struct cl_page_slice *slice,
380 void *cookie, lu_printer_t printer)
382 struct ccc_page *vp = cl2ccc_page(slice);
383 struct page *vmpage = vp->cpg_page;
385 (*printer)(env, cookie, LUSTRE_VVP_NAME "-page@%p(%d:%d:%d) vm@%p ",
386 vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
387 vp->cpg_write_queued, vmpage);
388 if (vmpage != NULL) {
389 (*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
390 (long)vmpage->flags, page_count(vmpage),
391 page_mapcount(vmpage), vmpage->private,
393 list_empty(&vmpage->lru) ? "not-" : "");
395 (*printer)(env, cookie, "\n");
399 static const struct cl_page_operations vvp_page_ops = {
400 .cpo_own = vvp_page_own,
401 .cpo_assume = vvp_page_assume,
402 .cpo_unassume = vvp_page_unassume,
403 .cpo_disown = vvp_page_disown,
404 .cpo_vmpage = ccc_page_vmpage,
405 .cpo_discard = vvp_page_discard,
406 .cpo_delete = vvp_page_delete,
407 .cpo_unmap = vvp_page_unmap,
408 .cpo_export = vvp_page_export,
409 .cpo_is_vmlocked = vvp_page_is_vmlocked,
410 .cpo_fini = vvp_page_fini,
411 .cpo_print = vvp_page_print,
412 .cpo_is_under_lock = ccc_page_is_under_lock,
415 .cpo_prep = vvp_page_prep_read,
416 .cpo_completion = vvp_page_completion_read,
417 .cpo_make_ready = ccc_fail,
420 .cpo_prep = vvp_page_prep_write,
421 .cpo_completion = vvp_page_completion_write,
422 .cpo_make_ready = vvp_page_make_ready,
427 static void vvp_transient_page_verify(const struct cl_page *page)
429 struct inode *inode = ccc_object_inode(page->cp_obj);
431 LASSERT(!inode_trylock(inode));
434 static int vvp_transient_page_own(const struct lu_env *env,
435 const struct cl_page_slice *slice,
436 struct cl_io *unused, int nonblock)
438 vvp_transient_page_verify(slice->cpl_page);
442 static void vvp_transient_page_assume(const struct lu_env *env,
443 const struct cl_page_slice *slice,
444 struct cl_io *unused)
446 vvp_transient_page_verify(slice->cpl_page);
449 static void vvp_transient_page_unassume(const struct lu_env *env,
450 const struct cl_page_slice *slice,
451 struct cl_io *unused)
453 vvp_transient_page_verify(slice->cpl_page);
456 static void vvp_transient_page_disown(const struct lu_env *env,
457 const struct cl_page_slice *slice,
458 struct cl_io *unused)
460 vvp_transient_page_verify(slice->cpl_page);
463 static void vvp_transient_page_discard(const struct lu_env *env,
464 const struct cl_page_slice *slice,
465 struct cl_io *unused)
467 struct cl_page *page = slice->cpl_page;
469 vvp_transient_page_verify(slice->cpl_page);
472 * For transient pages, remove it from the radix tree.
474 cl_page_delete(env, page);
477 static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
478 const struct cl_page_slice *slice)
480 struct inode *inode = ccc_object_inode(slice->cpl_obj);
483 locked = !inode_trylock(inode);
486 return locked ? -EBUSY : -ENODATA;
490 vvp_transient_page_completion(const struct lu_env *env,
491 const struct cl_page_slice *slice,
494 vvp_transient_page_verify(slice->cpl_page);
497 static void vvp_transient_page_fini(const struct lu_env *env,
498 struct cl_page_slice *slice)
500 struct ccc_page *cp = cl2ccc_page(slice);
501 struct cl_page *clp = slice->cpl_page;
502 struct ccc_object *clobj = cl2ccc(clp->cp_obj);
504 vvp_page_fini_common(cp);
505 LASSERT(!inode_trylock(clobj->cob_inode));
506 clobj->cob_transient_pages--;
509 static const struct cl_page_operations vvp_transient_page_ops = {
510 .cpo_own = vvp_transient_page_own,
511 .cpo_assume = vvp_transient_page_assume,
512 .cpo_unassume = vvp_transient_page_unassume,
513 .cpo_disown = vvp_transient_page_disown,
514 .cpo_discard = vvp_transient_page_discard,
515 .cpo_vmpage = ccc_page_vmpage,
516 .cpo_fini = vvp_transient_page_fini,
517 .cpo_is_vmlocked = vvp_transient_page_is_vmlocked,
518 .cpo_print = vvp_page_print,
519 .cpo_is_under_lock = ccc_page_is_under_lock,
522 .cpo_prep = ccc_transient_page_prep,
523 .cpo_completion = vvp_transient_page_completion,
526 .cpo_prep = ccc_transient_page_prep,
527 .cpo_completion = vvp_transient_page_completion,
532 int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
533 struct cl_page *page, struct page *vmpage)
535 struct ccc_page *cpg = cl_object_page_slice(obj, page);
537 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
539 cpg->cpg_page = vmpage;
540 page_cache_get(vmpage);
542 INIT_LIST_HEAD(&cpg->cpg_pending_linkage);
543 if (page->cp_type == CPT_CACHEABLE) {
544 SetPagePrivate(vmpage);
545 vmpage->private = (unsigned long)page;
546 cl_page_slice_add(page, &cpg->cpg_cl, obj,
549 struct ccc_object *clobj = cl2ccc(obj);
551 LASSERT(!inode_trylock(clobj->cob_inode));
552 cl_page_slice_add(page, &cpg->cpg_cl, obj,
553 &vvp_transient_page_ops);
554 clobj->cob_transient_pages++;