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);
162 #ifdef HAVE_RELEASEPAGE_WITH_INT
163 #define RELEASEPAGE_ARG_TYPE int
165 #define RELEASEPAGE_ARG_TYPE gfp_t
167 static int ll_releasepage(struct page *vmpage, RELEASEPAGE_ARG_TYPE gfp_mask)
170 struct cl_object *obj;
171 struct cl_page *clpage;
172 struct address_space *mapping;
175 LASSERT(PageLocked(vmpage));
176 if (PageWriteback(vmpage) || PageDirty(vmpage))
179 mapping = vmpage->mapping;
183 obj = ll_i2info(mapping->host)->lli_clob;
187 clpage = cl_vmpage_page(vmpage, obj);
191 env = cl_env_percpu_get();
192 LASSERT(!IS_ERR(env));
194 /* we must not delete the cl_page if the vmpage is in use, otherwise we
195 * disconnect the vmpage from Lustre while it's still alive(!), which
196 * means we won't find it to discard on lock cancellation.
198 * References here are: caller + cl_page + page cache.
199 * Any other references are potentially transient and must be ignored.
201 if (!cl_page_in_use(clpage) && !vmpage_in_use(vmpage, 1)) {
203 cl_page_delete(env, clpage);
206 /* To use percpu env array, the call path can not be rescheduled;
207 * otherwise percpu array will be messed if ll_releaspage() called
208 * again on the same CPU.
210 * If this page holds the last refc of cl_object, the following
211 * call path may cause reschedule:
212 * cl_page_put -> cl_page_free -> cl_object_put ->
213 * lu_object_put -> lu_object_free -> lov_delete_raid0.
215 * However, the kernel can't get rid of this inode until all pages have
216 * been cleaned up. Now that we hold page lock here, it's pretty safe
217 * that we won't get into object delete path.
219 LASSERT(cl_object_refc(obj) > 1);
220 cl_page_put(env, clpage);
222 cl_env_percpu_put(env);
226 static ssize_t ll_get_user_pages(int rw, struct iov_iter *iter,
227 struct page ***pages, ssize_t *npages,
230 #if defined(HAVE_DIO_ITER)
235 * iov_iter_get_pages_alloc() is introduced in 3.16 similar
238 result = iov_iter_get_pages_alloc(iter, pages, maxsize, &start);
240 *npages = DIV_ROUND_UP(result + start, PAGE_SIZE);
255 addr = (unsigned long)iter->iov->iov_base + iter->iov_offset;
256 if (addr & ~PAGE_MASK)
259 size = min_t(size_t, maxsize, iter->iov->iov_len);
260 page_count = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
261 OBD_ALLOC_PTR_ARRAY_LARGE(*pages, page_count);
265 mmap_read_lock(current->mm);
266 result = get_user_pages(current, current->mm, addr, page_count,
267 rw == READ, 0, *pages, NULL);
268 mmap_read_unlock(current->mm);
270 if (unlikely(result != page_count)) {
271 ll_release_user_pages(*pages, page_count);
279 *npages = page_count;
285 /* iov_iter_alignment() is introduced in 3.16 similar to HAVE_DIO_ITER */
286 #if defined(HAVE_DIO_ITER)
287 static unsigned long iov_iter_alignment_vfs(const struct iov_iter *i)
289 return iov_iter_alignment(i);
291 #else /* copied from alignment_iovec() */
292 static unsigned long iov_iter_alignment_vfs(const struct iov_iter *i)
294 const struct iovec *iov = i->iov;
296 size_t size = i->count;
302 res = (unsigned long)iov->iov_base + i->iov_offset;
303 n = iov->iov_len - i->iov_offset;
309 while (size > (++iov)->iov_len) {
310 res |= (unsigned long)iov->iov_base | iov->iov_len;
311 size -= iov->iov_len;
313 res |= (unsigned long)iov->iov_base | size;
320 * Lustre could relax a bit for alignment, io count is not
321 * necessary page alignment.
323 static unsigned long ll_iov_iter_alignment(struct iov_iter *i)
325 size_t orig_size = i->count;
326 size_t count = orig_size & ~PAGE_MASK;
330 return iov_iter_alignment_vfs(i);
332 if (orig_size > PAGE_SIZE) {
333 iov_iter_truncate(i, orig_size - count);
334 res = iov_iter_alignment_vfs(i);
335 iov_iter_reexpand(i, orig_size);
340 res = iov_iter_alignment_vfs(i);
341 /* start address is page aligned */
342 if ((res & ~PAGE_MASK) == orig_size)
349 ll_direct_rw_pages(const struct lu_env *env, struct cl_io *io, size_t size,
350 int rw, struct inode *inode, struct cl_sub_dio *sdio)
352 struct ll_dio_pages *pv = &sdio->csd_dio_pages;
353 struct cl_page *page;
354 struct cl_2queue *queue = &io->ci_queue;
355 struct cl_object *obj = io->ci_obj;
356 struct cl_sync_io *anchor = &sdio->csd_sync;
357 loff_t offset = pv->ldp_file_offset;
359 size_t page_size = cl_page_size(obj);
365 cl_2queue_init(queue);
366 for (i = 0; i < pv->ldp_count; i++) {
367 LASSERT(!(offset & (PAGE_SIZE - 1)));
368 page = cl_page_find(env, obj, cl_index(obj, offset),
369 pv->ldp_pages[i], CPT_TRANSIENT);
374 LASSERT(page->cp_type == CPT_TRANSIENT);
375 rc = cl_page_own(env, io, page);
377 cl_page_put(env, page);
381 page->cp_sync_io = anchor;
382 if (inode && IS_ENCRYPTED(inode)) {
383 /* In case of Direct IO on encrypted file, we need to
384 * add a reference to the inode on the cl_page.
385 * This info is required by llcrypt to proceed
386 * to encryption/decryption.
387 * This is safe because we know these pages are private
388 * to the thread doing the Direct IO.
390 page->cp_inode = inode;
392 /* We keep the refcount from cl_page_find, so we don't need
395 cl_page_list_add(&queue->c2_qin, page, false);
397 * Set page clip to tell transfer formation engine
398 * that page has to be sent even if it is beyond KMS.
400 if (size < page_size)
401 cl_page_clip(env, page, 0, size);
407 if (rc == 0 && io_pages > 0) {
408 int iot = rw == READ ? CRT_READ : CRT_WRITE;
410 atomic_add(io_pages, &anchor->csi_sync_nr);
412 * Avoid out-of-order execution of adding inflight
413 * modifications count and io submit.
416 rc = cl_io_submit_rw(env, io, iot, queue);
418 cl_page_list_splice(&queue->c2_qout, &sdio->csd_pages);
420 atomic_add(-queue->c2_qin.pl_nr,
421 &anchor->csi_sync_nr);
422 cl_page_list_for_each(page, &queue->c2_qin)
423 page->cp_sync_io = NULL;
425 /* handle partially submitted reqs */
426 if (queue->c2_qin.pl_nr > 0) {
427 CERROR(DFID " failed to submit %d dio pages: %zd\n",
428 PFID(lu_object_fid(&obj->co_lu)),
429 queue->c2_qin.pl_nr, rc);
435 cl_2queue_discard(env, io, queue);
436 cl_2queue_disown(env, queue);
437 cl_2queue_fini(env, queue);
441 #ifdef KMALLOC_MAX_SIZE
442 #define MAX_MALLOC KMALLOC_MAX_SIZE
444 #define MAX_MALLOC (128 * 1024)
447 /* This is the maximum size of a single O_DIRECT request, based on the
448 * kmalloc limit. We need to fit all of the brw_page structs, each one
449 * representing PAGE_SIZE worth of user data, into a single buffer, and
450 * then truncate this to be a full-sized RPC. For 4kB PAGE_SIZE this is
451 * up to 22MB for 128kB kmalloc and up to 682MB for 4MB kmalloc. */
452 #define MAX_DIO_SIZE ((MAX_MALLOC / sizeof(struct brw_page) * PAGE_SIZE) & \
453 ~((size_t)DT_MAX_BRW_SIZE - 1))
456 ll_direct_IO_impl(struct kiocb *iocb, struct iov_iter *iter, int rw)
458 struct ll_cl_context *lcc;
459 const struct lu_env *env;
461 struct file *file = iocb->ki_filp;
462 struct inode *inode = file->f_mapping->host;
463 struct cl_dio_aio *ll_dio_aio;
464 struct cl_sub_dio *ldp_aio;
465 size_t count = iov_iter_count(iter);
466 ssize_t tot_bytes = 0, result = 0;
467 loff_t file_offset = iocb->ki_pos;
468 bool sync_submit = false;
472 /* Check EOF by ourselves */
473 if (rw == READ && file_offset >= i_size_read(inode))
476 /* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
477 if (file_offset & ~PAGE_MASK)
480 CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), size=%zd (max %lu), "
481 "offset=%lld=%llx, pages %zd (max %lu)\n",
482 PFID(ll_inode2fid(inode)), inode, count, MAX_DIO_SIZE,
483 file_offset, file_offset, count >> PAGE_SHIFT,
484 MAX_DIO_SIZE >> PAGE_SHIFT);
486 /* Check that all user buffers are aligned as well */
487 if (ll_iov_iter_alignment(iter) & ~PAGE_MASK)
490 lcc = ll_cl_find(inode);
495 LASSERT(!IS_ERR(env));
496 vio = vvp_env_io(env);
500 ll_dio_aio = io->ci_dio_aio;
502 LASSERT(ll_dio_aio->cda_iocb == iocb);
504 /* We cannot do parallel submission of sub-I/Os - for AIO or regular
505 * DIO - unless lockless because it causes us to release the lock
508 * There are also several circumstances in which we must disable
509 * parallel DIO, so we check if it is enabled.
511 * The check for "is_sync_kiocb" excludes AIO, which does not need to
512 * be disabled in these situations.
514 if (io->ci_dio_lock || (is_sync_kiocb(iocb) && !io->ci_parallel_dio))
517 while (iov_iter_count(iter)) {
518 struct ll_dio_pages *pvec;
521 count = min_t(size_t, iov_iter_count(iter), MAX_DIO_SIZE);
523 if (file_offset >= i_size_read(inode))
526 if (file_offset + count > i_size_read(inode))
527 count = i_size_read(inode) - file_offset;
530 /* if we are doing sync_submit, then we free this below,
531 * otherwise it is freed on the final call to cl_sync_io_note
532 * (either in this function or from a ptlrpcd daemon)
534 ldp_aio = cl_sub_dio_alloc(ll_dio_aio, sync_submit);
536 GOTO(out, result = -ENOMEM);
538 pvec = &ldp_aio->csd_dio_pages;
540 result = ll_get_user_pages(rw, iter, &pages,
541 &pvec->ldp_count, count);
542 if (unlikely(result <= 0)) {
543 cl_sync_io_note(env, &ldp_aio->csd_sync, result);
545 LASSERT(ldp_aio->csd_creator_free);
546 cl_sub_dio_free(ldp_aio);
552 pvec->ldp_file_offset = file_offset;
553 pvec->ldp_pages = pages;
555 result = ll_direct_rw_pages(env, io, count,
557 /* We've submitted pages and can now remove the extra
560 cl_sync_io_note(env, &ldp_aio->csd_sync, result);
563 rc2 = cl_sync_io_wait(env, &ldp_aio->csd_sync,
565 if (result == 0 && rc2)
567 LASSERT(ldp_aio->csd_creator_free);
568 cl_sub_dio_free(ldp_aio);
570 if (unlikely(result < 0))
573 iov_iter_advance(iter, count);
575 file_offset += count;
579 ll_dio_aio->cda_bytes += tot_bytes;
582 vio->u.readwrite.vui_written += tot_bytes;
584 vio->u.readwrite.vui_read += tot_bytes;
586 /* AIO is not supported on pipes, so we cannot return EIOCBQEUED like
587 * we normally would for both DIO and AIO here
589 if (result == 0 && !iov_iter_is_pipe(iter))
590 result = -EIOCBQUEUED;
595 #if defined(HAVE_DIO_ITER)
596 static ssize_t ll_direct_IO(
597 #ifndef HAVE_IOV_ITER_RW
600 struct kiocb *iocb, struct iov_iter *iter
601 #ifndef HAVE_DIRECTIO_2ARGS
608 #ifndef HAVE_IOV_ITER_RW
611 nrw = iov_iter_rw(iter);
614 return ll_direct_IO_impl(iocb, iter, nrw);
617 #else /* !defined(HAVE_DIO_ITER) */
620 ll_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
621 loff_t file_offset, unsigned long nr_segs)
623 struct iov_iter iter;
625 iov_iter_init(&iter, iov, nr_segs, iov_length(iov, nr_segs), 0);
626 return ll_direct_IO_impl(iocb, &iter, rw);
629 #endif /* !defined(HAVE_DIO_ITER) */
632 * Prepare partially written-to page for a write.
633 * @pg is owned when passed in and disowned when it returns non-zero result to
636 static int ll_prepare_partial_page(const struct lu_env *env, struct cl_io *io,
637 struct cl_page *pg, struct file *file)
639 struct cl_attr *attr = vvp_env_thread_attr(env);
640 struct cl_object *obj = io->ci_obj;
641 loff_t offset = cl_offset(obj, cl_page_index(pg));
645 cl_object_attr_lock(obj);
646 result = cl_object_attr_get(env, obj, attr);
647 cl_object_attr_unlock(obj);
649 cl_page_disown(env, io, pg);
654 * If are writing to a new page, no need to read old data.
655 * The extent locking will have updated the KMS, and for our
656 * purposes here we can treat it like i_size.
658 if (attr->cat_kms <= offset) {
659 char *kaddr = kmap_atomic(pg->cp_vmpage);
661 memset(kaddr, 0, cl_page_size(obj));
662 kunmap_atomic(kaddr);
663 GOTO(out, result = 0);
666 if (pg->cp_defer_uptodate) {
668 GOTO(out, result = 0);
671 result = ll_io_read_page(env, io, pg, file);
675 /* ll_io_read_page() disowns the page */
676 result = cl_page_own(env, io, pg);
678 if (!PageUptodate(cl_page_vmpage(pg))) {
679 cl_page_disown(env, io, pg);
682 } else if (result == -ENOENT) {
683 /* page was truncated */
692 static int ll_tiny_write_begin(struct page *vmpage, struct address_space *mapping)
694 /* Page must be present, up to date, dirty, and not in writeback. */
695 if (!vmpage || !PageUptodate(vmpage) || !PageDirty(vmpage) ||
696 PageWriteback(vmpage) || vmpage->mapping != mapping)
702 static int ll_write_begin(struct file *file, struct address_space *mapping,
703 loff_t pos, unsigned len, unsigned flags,
704 struct page **pagep, void **fsdata)
706 struct ll_cl_context *lcc = NULL;
707 const struct lu_env *env = NULL;
708 struct cl_io *io = NULL;
709 struct cl_page *page = NULL;
710 struct inode *inode = file_inode(file);
711 struct cl_object *clob = ll_i2info(mapping->host)->lli_clob;
712 pgoff_t index = pos >> PAGE_SHIFT;
713 struct page *vmpage = NULL;
714 unsigned from = pos & (PAGE_SIZE - 1);
715 unsigned to = from + len;
719 CDEBUG(D_VFSTRACE, "Writing %lu of %d to %d bytes\n", index, from, len);
721 lcc = ll_cl_find(inode);
723 vmpage = grab_cache_page_nowait(mapping, index);
724 result = ll_tiny_write_begin(vmpage, mapping);
731 if (file->f_flags & O_DIRECT) {
732 /* direct IO failed because it couldn't clean up cached pages,
733 * this causes a problem for mirror write because the cached
734 * page may belong to another mirror, which will result in
735 * problem submitting the I/O. */
736 if (io->ci_designated_mirror > 0)
737 GOTO(out, result = -EBUSY);
740 * Direct write can fall back to buffered read, but DIO is done
741 * with lockless i/o, and buffered requires LDLM locking, so
742 * in this case we must restart without lockless.
744 if (!io->ci_dio_lock) {
746 io->ci_need_restart = 1;
747 GOTO(out, result = -ENOLCK);
751 /* To avoid deadlock, try to lock page first. */
752 vmpage = grab_cache_page_nowait(mapping, index);
754 if (unlikely(vmpage == NULL ||
755 PageDirty(vmpage) || PageWriteback(vmpage))) {
756 struct vvp_io *vio = vvp_env_io(env);
757 struct cl_page_list *plist = &vio->u.readwrite.vui_queue;
759 /* if the page is already in dirty cache, we have to commit
760 * the pages right now; otherwise, it may cause deadlock
761 * because it holds page lock of a dirty page and request for
762 * more grants. It's okay for the dirty page to be the first
763 * one in commit page list, though. */
764 if (vmpage != NULL && plist->pl_nr > 0) {
770 /* commit pages and then wait for page lock */
771 result = vvp_io_write_commit(env, io);
775 if (vmpage == NULL) {
776 vmpage = grab_cache_page_write_begin(mapping, index,
779 GOTO(out, result = -ENOMEM);
783 /* page was truncated */
784 if (mapping != vmpage->mapping) {
785 CDEBUG(D_VFSTRACE, "page: %lu was truncated\n", index);
792 page = cl_page_find(env, clob, vmpage->index, vmpage, CPT_CACHEABLE);
794 GOTO(out, result = PTR_ERR(page));
796 lcc->lcc_page = page;
797 lu_ref_add(&page->cp_reference, "cl_io", io);
799 cl_page_assume(env, io, page);
800 if (!PageUptodate(vmpage)) {
802 * We're completely overwriting an existing page,
803 * so _don't_ set it up to date until commit_write
805 if (from == 0 && to == PAGE_SIZE) {
806 CL_PAGE_HEADER(D_PAGE, env, page, "full page write\n");
807 POISON_PAGE(vmpage, 0x11);
809 /* TODO: can be optimized at OSC layer to check if it
810 * is a lockless IO. In that case, it's not necessary
811 * to read the data. */
812 result = ll_prepare_partial_page(env, io, page, file);
814 /* vmpage should have been unlocked */
818 if (result == -EAGAIN)
827 if (vmpage != NULL) {
831 /* On tiny_write failure, page and io are always null. */
832 if (!IS_ERR_OR_NULL(page)) {
833 lu_ref_del(&page->cp_reference, "cl_io", io);
834 cl_page_put(env, page);
837 io->ci_result = result;
845 static int ll_tiny_write_end(struct file *file, struct address_space *mapping,
846 loff_t pos, unsigned int len, unsigned int copied,
849 struct cl_page *clpage = (struct cl_page *) vmpage->private;
850 loff_t kms = pos+copied;
851 loff_t to = kms & (PAGE_SIZE-1) ? kms & (PAGE_SIZE-1) : PAGE_SIZE;
853 struct lu_env *env = cl_env_get(&refcheck);
863 /* This page is dirty in cache, so it should have a cl_page pointer
864 * set in vmpage->private.
866 LASSERT(clpage != NULL);
871 /* Update the underlying size information in the OSC/LOV objects this
874 cl_page_touch(env, clpage, to);
877 cl_env_put(env, &refcheck);
880 /* Must return page unlocked. */
886 static int ll_write_end(struct file *file, struct address_space *mapping,
887 loff_t pos, unsigned len, unsigned copied,
888 struct page *vmpage, void *fsdata)
890 struct ll_cl_context *lcc = fsdata;
891 const struct lu_env *env;
894 struct cl_page *page;
895 unsigned from = pos & (PAGE_SIZE - 1);
902 CDEBUG(D_VFSTRACE, "pos %llu, len %u, copied %u\n", pos, len, copied);
905 result = ll_tiny_write_end(file, mapping, pos, len, copied,
910 LASSERT(lcc != NULL);
912 page = lcc->lcc_page;
914 vio = vvp_env_io(env);
916 LASSERT(cl_page_is_owned(page, io));
918 struct cl_page_list *plist = &vio->u.readwrite.vui_queue;
920 lcc->lcc_page = NULL; /* page will be queued */
922 /* Add it into write queue */
923 cl_page_list_add(plist, page, true);
924 if (plist->pl_nr == 1) /* first page */
925 vio->u.readwrite.vui_from = from;
928 vio->u.readwrite.vui_to = from + copied;
930 /* To address the deadlock in balance_dirty_pages() where
931 * this dirty page may be written back in the same thread. */
932 if (PageDirty(vmpage))
935 /* We may have one full RPC, commit it soon */
936 if (plist->pl_nr >= PTLRPC_MAX_BRW_PAGES)
939 CL_PAGE_DEBUG(D_VFSTRACE, env, page,
940 "queued page: %d.\n", plist->pl_nr);
942 cl_page_disown(env, io, page);
944 lcc->lcc_page = NULL;
945 lu_ref_del(&page->cp_reference, "cl_io", io);
946 cl_page_put(env, page);
948 /* page list is not contiguous now, commit it now */
951 if (unplug || io->u.ci_wr.wr_sync)
952 result = vvp_io_write_commit(env, io);
955 io->ci_result = result;
959 RETURN(result >= 0 ? copied : result);
962 #ifdef CONFIG_MIGRATION
963 static int ll_migratepage(struct address_space *mapping,
964 struct page *newpage, struct page *page,
965 enum migrate_mode mode)
967 /* Always fail page migration until we have a proper implementation */
972 const struct address_space_operations ll_aops = {
973 #ifdef HAVE_DIRTY_FOLIO
974 .dirty_folio = filemap_dirty_folio,
976 .set_page_dirty = __set_page_dirty_nobuffers,
978 #ifdef HAVE_INVALIDATE_FOLIO
979 .invalidate_folio = ll_invalidate_folio,
981 .invalidatepage = ll_invalidatepage,
983 .readpage = ll_readpage,
984 .releasepage = (void *)ll_releasepage,
985 .direct_IO = ll_direct_IO,
986 .writepage = ll_writepage,
987 .writepages = ll_writepages,
988 .write_begin = ll_write_begin,
989 .write_end = ll_write_end,
990 #ifdef CONFIG_MIGRATION
991 .migratepage = ll_migratepage,