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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/lustre/llite/rw26.c
33 * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version
36 #include <linux/buffer_head.h>
37 #include <linux/errno.h>
39 #include <linux/kernel.h>
41 #include <linux/mpage.h>
42 #include <linux/pagemap.h>
43 #include <linux/string.h>
44 #include <linux/unistd.h>
45 #include <linux/writeback.h>
46 #include <linux/migrate.h>
48 #define DEBUG_SUBSYSTEM S_LLITE
50 #include "llite_internal.h"
51 #include <lustre_compat.h>
53 #ifdef HAVE_INVALIDATE_FOLIO
55 * Implements Linux VM address_space::invalidate_folio() method. This method is
56 * called when the folio is truncated from a file, either as a result of
57 * explicit truncate, or when inode is removed from memory (as a result of
58 * final iput(), umount, or memory pressure induced icache shrinking).
60 * [0, off] bytes of the folio remain valid (this is for a case of non-page
61 * aligned truncate). Lustre leaves partially truncated folios in the cache,
62 * relying on struct inode::i_size to limit further accesses.
64 static void ll_invalidate_folio(struct folio *folio, size_t offset, size_t len)
69 struct cl_object *obj;
71 LASSERT(!folio_test_writeback(folio));
72 LASSERT(folio_test_locked(folio));
74 if (!(offset == 0 && len == folio_size(folio)) &&
75 !folio_test_large(folio))
78 /* Drop the pages from the folio */
79 env = cl_env_percpu_get();
80 LASSERT(!IS_ERR(env));
82 inode = folio_inode(folio);
83 obj = ll_i2info(inode)->lli_clob;
85 int n, npgs = folio_nr_pages(folio);
87 for (n = 0; n < npgs; n++) {
88 struct page *vmpage = folio_page(folio, n);
90 LASSERT(PageLocked(vmpage));
91 LASSERT(!PageWriteback(vmpage));
93 page = cl_vmpage_page(vmpage, obj);
95 cl_page_delete(env, page);
96 cl_page_put(env, page);
100 LASSERT(!folio_get_private(folio));
102 cl_env_percpu_put(env);
107 * Implements Linux VM address_space::invalidatepage() method. This method is
108 * called when the page is truncate from a file, either as a result of
109 * explicit truncate, or when inode is removed from memory (as a result of
110 * final iput(), umount, or memory pressure induced icache shrinking).
112 * [0, offset] bytes of the page remain valid (this is for a case of not-page
113 * aligned truncate). Lustre leaves partially truncated page in the cache,
114 * relying on struct inode::i_size to limit further accesses.
116 static void ll_invalidatepage(struct page *vmpage,
117 #ifdef HAVE_INVALIDATE_RANGE
118 unsigned int offset, unsigned int length
126 struct cl_page *page;
127 struct cl_object *obj;
129 LASSERT(PageLocked(vmpage));
130 LASSERT(!PageWriteback(vmpage));
133 * It is safe to not check anything in invalidatepage/releasepage
134 * below because they are run with page locked and all our io is
135 * happening with locked page too
137 #ifdef HAVE_INVALIDATE_RANGE
138 if (offset == 0 && length == PAGE_SIZE) {
142 /* See the comment in ll_releasepage() */
143 env = cl_env_percpu_get();
144 LASSERT(!IS_ERR(env));
146 inode = vmpage->mapping->host;
147 obj = ll_i2info(inode)->lli_clob;
149 page = cl_vmpage_page(vmpage, obj);
151 cl_page_delete(env, page);
152 cl_page_put(env, page);
155 LASSERT(vmpage->private == 0);
157 cl_env_percpu_put(env);
160 if (OBD_FAIL_PRECHECK(OBD_FAIL_LLITE_PAGE_INVALIDATE_PAUSE)) {
162 OBD_FAIL_TIMEOUT(OBD_FAIL_LLITE_PAGE_INVALIDATE_PAUSE,
169 #ifdef HAVE_RELEASEPAGE_WITH_INT
170 #define RELEASEPAGE_ARG_TYPE int
172 #define RELEASEPAGE_ARG_TYPE gfp_t
174 static int ll_releasepage(struct page *vmpage, RELEASEPAGE_ARG_TYPE gfp_mask)
177 struct cl_object *obj;
178 struct cl_page *clpage;
179 struct address_space *mapping;
182 LASSERT(PageLocked(vmpage));
183 if (PageWriteback(vmpage) || PageDirty(vmpage))
186 mapping = vmpage->mapping;
190 obj = ll_i2info(mapping->host)->lli_clob;
194 clpage = cl_vmpage_page(vmpage, obj);
198 env = cl_env_percpu_get();
199 LASSERT(!IS_ERR(env));
201 /* we must not delete the cl_page if the vmpage is in use, otherwise we
202 * disconnect the vmpage from Lustre while it's still alive(!), which
203 * means we won't find it to discard on lock cancellation.
205 * References here are: caller + cl_page + page cache.
206 * Any other references are potentially transient and must be ignored.
208 if (!cl_page_in_use(clpage) && !vmpage_in_use(vmpage, 1)) {
210 cl_page_delete(env, clpage);
213 /* To use percpu env array, the call path can not be rescheduled;
214 * otherwise percpu array will be messed if ll_releaspage() called
215 * again on the same CPU.
217 * If this page holds the last refc of cl_object, the following
218 * call path may cause reschedule:
219 * cl_page_put -> cl_page_free -> cl_object_put ->
220 * lu_object_put -> lu_object_free -> lov_delete_raid0.
222 * However, the kernel can't get rid of this inode until all pages have
223 * been cleaned up. Now that we hold page lock here, it's pretty safe
224 * that we won't get into object delete path.
226 LASSERT(cl_object_refc(obj) > 1);
227 cl_page_put(env, clpage);
229 cl_env_percpu_put(env);
233 static ssize_t ll_get_user_pages(int rw, struct iov_iter *iter,
234 struct page ***pages, ssize_t *npages,
237 #if defined(HAVE_DIO_ITER)
242 * iov_iter_get_pages_alloc() is introduced in 3.16 similar
245 result = iov_iter_get_pages_alloc(iter, pages, maxsize, &start);
247 *npages = DIV_ROUND_UP(result + start, PAGE_SIZE);
262 addr = (unsigned long)iter->iov->iov_base + iter->iov_offset;
263 if (addr & ~PAGE_MASK)
266 size = min_t(size_t, maxsize, iter->iov->iov_len);
267 page_count = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
268 OBD_ALLOC_PTR_ARRAY_LARGE(*pages, page_count);
272 mmap_read_lock(current->mm);
273 result = get_user_pages(current, current->mm, addr, page_count,
274 rw == READ, 0, *pages, NULL);
275 mmap_read_unlock(current->mm);
277 if (unlikely(result != page_count)) {
278 ll_release_user_pages(*pages, page_count);
286 *npages = page_count;
292 /* iov_iter_alignment() is introduced in 3.16 similar to HAVE_DIO_ITER */
293 #if defined(HAVE_DIO_ITER)
294 static unsigned long iov_iter_alignment_vfs(const struct iov_iter *i)
296 return iov_iter_alignment(i);
298 #else /* copied from alignment_iovec() */
299 static unsigned long iov_iter_alignment_vfs(const struct iov_iter *i)
301 const struct iovec *iov = i->iov;
303 size_t size = i->count;
309 res = (unsigned long)iov->iov_base + i->iov_offset;
310 n = iov->iov_len - i->iov_offset;
316 while (size > (++iov)->iov_len) {
317 res |= (unsigned long)iov->iov_base | iov->iov_len;
318 size -= iov->iov_len;
320 res |= (unsigned long)iov->iov_base | size;
327 * Lustre could relax a bit for alignment, io count is not
328 * necessary page alignment.
330 static unsigned long ll_iov_iter_alignment(struct iov_iter *i)
332 size_t orig_size = i->count;
333 size_t count = orig_size & ~PAGE_MASK;
337 return iov_iter_alignment_vfs(i);
339 if (orig_size > PAGE_SIZE) {
340 iov_iter_truncate(i, orig_size - count);
341 res = iov_iter_alignment_vfs(i);
342 iov_iter_reexpand(i, orig_size);
347 res = iov_iter_alignment_vfs(i);
348 /* start address is page aligned */
349 if ((res & ~PAGE_MASK) == orig_size)
356 ll_direct_rw_pages(const struct lu_env *env, struct cl_io *io, size_t size,
357 int rw, struct inode *inode, struct cl_sub_dio *sdio)
359 struct ll_dio_pages *pv = &sdio->csd_dio_pages;
360 struct cl_page *page;
361 struct cl_2queue *queue = &io->ci_queue;
362 struct cl_object *obj = io->ci_obj;
363 struct cl_sync_io *anchor = &sdio->csd_sync;
364 loff_t offset = pv->ldp_file_offset;
371 cl_2queue_init(queue);
372 for (i = 0; i < pv->ldp_count; i++) {
373 LASSERT(!(offset & (PAGE_SIZE - 1)));
374 page = cl_page_find(env, obj, cl_index(obj, offset),
375 pv->ldp_pages[i], CPT_TRANSIENT);
380 LASSERT(page->cp_type == CPT_TRANSIENT);
381 rc = cl_page_own(env, io, page);
383 cl_page_put(env, page);
387 page->cp_sync_io = anchor;
388 if (inode && IS_ENCRYPTED(inode)) {
389 /* In case of Direct IO on encrypted file, we need to
390 * add a reference to the inode on the cl_page.
391 * This info is required by llcrypt to proceed
392 * to encryption/decryption.
393 * This is safe because we know these pages are private
394 * to the thread doing the Direct IO.
396 page->cp_inode = inode;
398 /* We keep the refcount from cl_page_find, so we don't need
401 cl_page_list_add(&queue->c2_qin, page, false);
403 * Set page clip to tell transfer formation engine
404 * that page has to be sent even if it is beyond KMS.
406 if (size < PAGE_SIZE)
407 cl_page_clip(env, page, 0, size);
413 if (rc == 0 && io_pages > 0) {
414 int iot = rw == READ ? CRT_READ : CRT_WRITE;
416 atomic_add(io_pages, &anchor->csi_sync_nr);
418 * Avoid out-of-order execution of adding inflight
419 * modifications count and io submit.
422 rc = cl_io_submit_rw(env, io, iot, queue);
424 cl_page_list_splice(&queue->c2_qout, &sdio->csd_pages);
426 atomic_add(-queue->c2_qin.pl_nr,
427 &anchor->csi_sync_nr);
428 cl_page_list_for_each(page, &queue->c2_qin)
429 page->cp_sync_io = NULL;
431 /* handle partially submitted reqs */
432 if (queue->c2_qin.pl_nr > 0) {
433 CERROR(DFID " failed to submit %d dio pages: %zd\n",
434 PFID(lu_object_fid(&obj->co_lu)),
435 queue->c2_qin.pl_nr, rc);
441 cl_2queue_discard(env, io, queue);
442 cl_2queue_disown(env, queue);
443 cl_2queue_fini(env, queue);
447 #ifdef KMALLOC_MAX_SIZE
448 #define MAX_MALLOC KMALLOC_MAX_SIZE
450 #define MAX_MALLOC (128 * 1024)
453 /* This is the maximum size of a single O_DIRECT request, based on the
454 * kmalloc limit. We need to fit all of the brw_page structs, each one
455 * representing PAGE_SIZE worth of user data, into a single buffer, and
456 * then truncate this to be a full-sized RPC. For 4kB PAGE_SIZE this is
457 * up to 22MB for 128kB kmalloc and up to 682MB for 4MB kmalloc. */
458 #define MAX_DIO_SIZE ((MAX_MALLOC / sizeof(struct brw_page) * PAGE_SIZE) & \
459 ~((size_t)DT_MAX_BRW_SIZE - 1))
462 ll_direct_IO_impl(struct kiocb *iocb, struct iov_iter *iter, int rw)
464 struct ll_cl_context *lcc;
465 const struct lu_env *env;
467 struct file *file = iocb->ki_filp;
468 struct inode *inode = file->f_mapping->host;
469 struct cl_dio_aio *ll_dio_aio;
470 struct cl_sub_dio *ldp_aio;
471 size_t count = iov_iter_count(iter);
472 ssize_t tot_bytes = 0, result = 0;
473 loff_t file_offset = iocb->ki_pos;
474 bool sync_submit = false;
478 /* Check EOF by ourselves */
479 if (rw == READ && file_offset >= i_size_read(inode))
482 /* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
483 if (file_offset & ~PAGE_MASK)
486 CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), size=%zd (max %lu), "
487 "offset=%lld=%llx, pages %zd (max %lu)\n",
488 PFID(ll_inode2fid(inode)), inode, count, MAX_DIO_SIZE,
489 file_offset, file_offset, count >> PAGE_SHIFT,
490 MAX_DIO_SIZE >> PAGE_SHIFT);
492 /* Check that all user buffers are aligned as well */
493 if (ll_iov_iter_alignment(iter) & ~PAGE_MASK)
496 lcc = ll_cl_find(inode);
501 LASSERT(!IS_ERR(env));
502 vio = vvp_env_io(env);
506 ll_dio_aio = io->ci_dio_aio;
508 LASSERT(ll_dio_aio->cda_iocb == iocb);
510 /* We cannot do parallel submission of sub-I/Os - for AIO or regular
511 * DIO - unless lockless because it causes us to release the lock
514 * There are also several circumstances in which we must disable
515 * parallel DIO, so we check if it is enabled.
517 * The check for "is_sync_kiocb" excludes AIO, which does not need to
518 * be disabled in these situations.
520 if (io->ci_dio_lock || (is_sync_kiocb(iocb) && !io->ci_parallel_dio))
523 while (iov_iter_count(iter)) {
524 struct ll_dio_pages *pvec;
527 count = min_t(size_t, iov_iter_count(iter), MAX_DIO_SIZE);
529 if (file_offset >= i_size_read(inode))
532 if (file_offset + count > i_size_read(inode))
533 count = i_size_read(inode) - file_offset;
536 /* if we are doing sync_submit, then we free this below,
537 * otherwise it is freed on the final call to cl_sync_io_note
538 * (either in this function or from a ptlrpcd daemon)
540 ldp_aio = cl_sub_dio_alloc(ll_dio_aio, sync_submit);
542 GOTO(out, result = -ENOMEM);
544 pvec = &ldp_aio->csd_dio_pages;
546 result = ll_get_user_pages(rw, iter, &pages,
547 &pvec->ldp_count, count);
548 if (unlikely(result <= 0)) {
549 cl_sync_io_note(env, &ldp_aio->csd_sync, result);
551 LASSERT(ldp_aio->csd_creator_free);
552 cl_sub_dio_free(ldp_aio);
558 pvec->ldp_file_offset = file_offset;
559 pvec->ldp_pages = pages;
561 result = ll_direct_rw_pages(env, io, count,
563 /* We've submitted pages and can now remove the extra
566 cl_sync_io_note(env, &ldp_aio->csd_sync, result);
569 rc2 = cl_sync_io_wait(env, &ldp_aio->csd_sync,
571 if (result == 0 && rc2)
573 LASSERT(ldp_aio->csd_creator_free);
574 cl_sub_dio_free(ldp_aio);
576 if (unlikely(result < 0))
579 iov_iter_advance(iter, count);
581 file_offset += count;
585 ll_dio_aio->cda_bytes += tot_bytes;
588 vio->u.readwrite.vui_written += tot_bytes;
590 vio->u.readwrite.vui_read += tot_bytes;
592 /* AIO is not supported on pipes, so we cannot return EIOCBQEUED like
593 * we normally would for both DIO and AIO here
595 if (result == 0 && !iov_iter_is_pipe(iter))
596 result = -EIOCBQUEUED;
601 #if defined(HAVE_DIO_ITER)
602 static ssize_t ll_direct_IO(
603 #ifndef HAVE_IOV_ITER_RW
606 struct kiocb *iocb, struct iov_iter *iter
607 #ifndef HAVE_DIRECTIO_2ARGS
614 #ifndef HAVE_IOV_ITER_RW
617 nrw = iov_iter_rw(iter);
620 return ll_direct_IO_impl(iocb, iter, nrw);
623 #else /* !defined(HAVE_DIO_ITER) */
626 ll_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
627 loff_t file_offset, unsigned long nr_segs)
629 struct iov_iter iter;
631 iov_iter_init(&iter, iov, nr_segs, iov_length(iov, nr_segs), 0);
632 return ll_direct_IO_impl(iocb, &iter, rw);
635 #endif /* !defined(HAVE_DIO_ITER) */
638 * Prepare partially written-to page for a write.
639 * @pg is owned when passed in and disowned when it returns non-zero result to
642 static int ll_prepare_partial_page(const struct lu_env *env, struct cl_io *io,
643 struct cl_page *pg, struct file *file)
645 struct cl_attr *attr = vvp_env_thread_attr(env);
646 struct cl_object *obj = io->ci_obj;
647 loff_t offset = cl_offset(obj, cl_page_index(pg));
651 cl_object_attr_lock(obj);
652 result = cl_object_attr_get(env, obj, attr);
653 cl_object_attr_unlock(obj);
655 cl_page_disown(env, io, pg);
660 * If are writing to a new page, no need to read old data.
661 * The extent locking will have updated the KMS, and for our
662 * purposes here we can treat it like i_size.
664 if (attr->cat_kms <= offset) {
665 char *kaddr = kmap_atomic(pg->cp_vmpage);
667 memset(kaddr, 0, PAGE_SIZE);
668 kunmap_atomic(kaddr);
669 GOTO(out, result = 0);
672 if (pg->cp_defer_uptodate) {
674 GOTO(out, result = 0);
677 result = ll_io_read_page(env, io, pg, file);
681 /* ll_io_read_page() disowns the page */
682 result = cl_page_own(env, io, pg);
684 if (!PageUptodate(cl_page_vmpage(pg))) {
685 cl_page_disown(env, io, pg);
688 } else if (result == -ENOENT) {
689 /* page was truncated */
698 static int ll_tiny_write_begin(struct page *vmpage, struct address_space *mapping)
700 /* Page must be present, up to date, dirty, and not in writeback. */
701 if (!vmpage || !PageUptodate(vmpage) || !PageDirty(vmpage) ||
702 PageWriteback(vmpage) || vmpage->mapping != mapping)
708 static int ll_write_begin(struct file *file, struct address_space *mapping,
709 loff_t pos, unsigned len, unsigned flags,
710 struct page **pagep, void **fsdata)
712 struct ll_cl_context *lcc = NULL;
713 const struct lu_env *env = NULL;
714 struct cl_io *io = NULL;
715 struct cl_page *page = NULL;
716 struct inode *inode = file_inode(file);
717 struct cl_object *clob = ll_i2info(mapping->host)->lli_clob;
718 pgoff_t index = pos >> PAGE_SHIFT;
719 struct page *vmpage = NULL;
720 unsigned from = pos & (PAGE_SIZE - 1);
721 unsigned to = from + len;
725 CDEBUG(D_VFSTRACE, "Writing %lu of %d to %d bytes\n", index, from, len);
727 lcc = ll_cl_find(inode);
729 vmpage = grab_cache_page_nowait(mapping, index);
730 result = ll_tiny_write_begin(vmpage, mapping);
737 if (file->f_flags & O_DIRECT) {
738 /* direct IO failed because it couldn't clean up cached pages,
739 * this causes a problem for mirror write because the cached
740 * page may belong to another mirror, which will result in
741 * problem submitting the I/O. */
742 if (io->ci_designated_mirror > 0)
743 GOTO(out, result = -EBUSY);
746 * Direct write can fall back to buffered read, but DIO is done
747 * with lockless i/o, and buffered requires LDLM locking, so
748 * in this case we must restart without lockless.
750 if (!io->ci_dio_lock) {
752 io->ci_need_restart = 1;
753 GOTO(out, result = -ENOLCK);
757 /* To avoid deadlock, try to lock page first. */
758 vmpage = grab_cache_page_nowait(mapping, index);
760 if (unlikely(vmpage == NULL ||
761 PageDirty(vmpage) || PageWriteback(vmpage))) {
762 struct vvp_io *vio = vvp_env_io(env);
763 struct cl_page_list *plist = &vio->u.readwrite.vui_queue;
765 /* if the page is already in dirty cache, we have to commit
766 * the pages right now; otherwise, it may cause deadlock
767 * because it holds page lock of a dirty page and request for
768 * more grants. It's okay for the dirty page to be the first
769 * one in commit page list, though. */
770 if (vmpage != NULL && plist->pl_nr > 0) {
776 /* commit pages and then wait for page lock */
777 result = vvp_io_write_commit(env, io);
781 if (vmpage == NULL) {
782 vmpage = grab_cache_page_write_begin(mapping, index,
785 GOTO(out, result = -ENOMEM);
789 /* page was truncated */
790 if (mapping != vmpage->mapping) {
791 CDEBUG(D_VFSTRACE, "page: %lu was truncated\n", index);
798 page = cl_page_find(env, clob, vmpage->index, vmpage, CPT_CACHEABLE);
800 GOTO(out, result = PTR_ERR(page));
802 lcc->lcc_page = page;
803 lu_ref_add(&page->cp_reference, "cl_io", io);
805 cl_page_assume(env, io, page);
806 if (!PageUptodate(vmpage)) {
808 * We're completely overwriting an existing page,
809 * so _don't_ set it up to date until commit_write
811 if (from == 0 && to == PAGE_SIZE) {
812 CL_PAGE_HEADER(D_PAGE, env, page, "full page write\n");
813 POISON_PAGE(vmpage, 0x11);
815 /* TODO: can be optimized at OSC layer to check if it
816 * is a lockless IO. In that case, it's not necessary
817 * to read the data. */
818 result = ll_prepare_partial_page(env, io, page, file);
820 /* vmpage should have been unlocked */
824 if (result == -EAGAIN)
833 if (vmpage != NULL) {
837 /* On tiny_write failure, page and io are always null. */
838 if (!IS_ERR_OR_NULL(page)) {
839 lu_ref_del(&page->cp_reference, "cl_io", io);
840 cl_page_put(env, page);
843 io->ci_result = result;
851 static int ll_tiny_write_end(struct file *file, struct address_space *mapping,
852 loff_t pos, unsigned int len, unsigned int copied,
855 struct cl_page *clpage = (struct cl_page *) vmpage->private;
856 loff_t kms = pos+copied;
857 loff_t to = kms & (PAGE_SIZE-1) ? kms & (PAGE_SIZE-1) : PAGE_SIZE;
859 struct lu_env *env = cl_env_get(&refcheck);
869 /* This page is dirty in cache, so it should have a cl_page pointer
870 * set in vmpage->private.
872 LASSERT(clpage != NULL);
877 /* Update the underlying size information in the OSC/LOV objects this
880 cl_page_touch(env, clpage, to);
883 cl_env_put(env, &refcheck);
886 /* Must return page unlocked. */
892 static int ll_write_end(struct file *file, struct address_space *mapping,
893 loff_t pos, unsigned len, unsigned copied,
894 struct page *vmpage, void *fsdata)
896 struct ll_cl_context *lcc = fsdata;
897 const struct lu_env *env;
900 struct cl_page *page;
901 unsigned from = pos & (PAGE_SIZE - 1);
908 CDEBUG(D_VFSTRACE, "pos %llu, len %u, copied %u\n", pos, len, copied);
911 result = ll_tiny_write_end(file, mapping, pos, len, copied,
916 LASSERT(lcc != NULL);
918 page = lcc->lcc_page;
920 vio = vvp_env_io(env);
922 LASSERT(cl_page_is_owned(page, io));
924 struct cl_page_list *plist = &vio->u.readwrite.vui_queue;
926 lcc->lcc_page = NULL; /* page will be queued */
928 /* Add it into write queue */
929 cl_page_list_add(plist, page, true);
930 if (plist->pl_nr == 1) /* first page */
931 vio->u.readwrite.vui_from = from;
934 vio->u.readwrite.vui_to = from + copied;
936 /* To address the deadlock in balance_dirty_pages() where
937 * this dirty page may be written back in the same thread. */
938 if (PageDirty(vmpage))
941 /* We may have one full RPC, commit it soon */
942 if (plist->pl_nr >= PTLRPC_MAX_BRW_PAGES)
945 CL_PAGE_DEBUG(D_VFSTRACE, env, page,
946 "queued page: %d.\n", plist->pl_nr);
948 cl_page_disown(env, io, page);
950 lcc->lcc_page = NULL;
951 lu_ref_del(&page->cp_reference, "cl_io", io);
952 cl_page_put(env, page);
954 /* page list is not contiguous now, commit it now */
957 if (unplug || io->u.ci_wr.wr_sync)
958 result = vvp_io_write_commit(env, io);
961 io->ci_result = result;
965 RETURN(result >= 0 ? copied : result);
968 #ifdef CONFIG_MIGRATION
969 static int ll_migratepage(struct address_space *mapping,
970 struct page *newpage, struct page *page,
971 enum migrate_mode mode)
973 /* Always fail page migration until we have a proper implementation */
978 const struct address_space_operations ll_aops = {
979 #ifdef HAVE_DIRTY_FOLIO
980 .dirty_folio = filemap_dirty_folio,
982 .set_page_dirty = __set_page_dirty_nobuffers,
984 #ifdef HAVE_INVALIDATE_FOLIO
985 .invalidate_folio = ll_invalidate_folio,
987 .invalidatepage = ll_invalidatepage,
989 .readpage = ll_readpage,
990 .releasepage = (void *)ll_releasepage,
991 .direct_IO = ll_direct_IO,
992 .writepage = ll_writepage,
993 .writepages = ll_writepages,
994 .write_begin = ll_write_begin,
995 .write_end = ll_write_end,
996 #ifdef CONFIG_MIGRATION
997 .migratepage = ll_migratepage,