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) 2008, 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 * Implementation of cl_io for VVP layer.
33 * Author: Nikita Danilov <nikita.danilov@sun.com>
34 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
37 #define DEBUG_SUBSYSTEM S_LLITE
40 #include <linux/pagevec.h>
41 #include <linux/memcontrol.h>
42 #include <linux/falloc.h>
44 #include "llite_internal.h"
45 #include "vvp_internal.h"
46 #include <libcfs/linux/linux-misc.h>
48 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
49 const struct cl_io_slice *slice)
53 vio = container_of(slice, struct vvp_io, vui_cl);
54 LASSERT(vio == vvp_env_io(env));
60 * For swapping layout. The file's layout may have changed.
61 * To avoid populating pages to a wrong stripe, we have to verify the
62 * correctness of layout. It works because swapping layout processes
63 * have to acquire group lock.
65 static bool can_populate_pages(const struct lu_env *env, struct cl_io *io,
68 struct ll_inode_info *lli = ll_i2info(inode);
69 struct vvp_io *vio = vvp_env_io(env);
72 switch (io->ci_type) {
75 /* don't need lock here to check lli_layout_gen as we have held
76 * extent lock and GROUP lock has to hold to swap layout */
77 if (ll_layout_version_get(lli) != vio->vui_layout_gen ||
78 OBD_FAIL_CHECK_RESET(OBD_FAIL_LLITE_LOST_LAYOUT, 0)) {
79 io->ci_need_restart = 1;
80 /* this will cause a short read/write */
85 /* fault is okay because we've already had a page. */
93 static void vvp_object_size_lock(struct cl_object *obj)
95 struct inode *inode = vvp_object_inode(obj);
97 ll_inode_size_lock(inode);
98 cl_object_attr_lock(obj);
101 static void vvp_object_size_unlock(struct cl_object *obj)
103 struct inode *inode = vvp_object_inode(obj);
105 cl_object_attr_unlock(obj);
106 ll_inode_size_unlock(inode);
110 * Helper function that if necessary adjusts file size (inode->i_size), when
111 * position at the offset \a pos is accessed. File size can be arbitrary stale
112 * on a Lustre client, but client at least knows KMS. If accessed area is
113 * inside [0, KMS], set file size to KMS, otherwise glimpse file size.
115 * Locking: i_size_lock is used to serialize changes to inode size and to
116 * protect consistency between inode size and cl_object
117 * attributes. cl_object_size_lock() protects consistency between cl_attr's of
118 * top-object and sub-objects.
120 static int vvp_prep_size(const struct lu_env *env, struct cl_object *obj,
121 struct cl_io *io, loff_t start, size_t count,
124 struct cl_attr *attr = vvp_env_thread_attr(env);
125 struct inode *inode = vvp_object_inode(obj);
126 loff_t pos = start + count - 1;
131 * Consistency guarantees: following possibilities exist for the
132 * relation between region being accessed and real file size at this
135 * (A): the region is completely inside of the file;
137 * (B-x): x bytes of region are inside of the file, the rest is
140 * (C): the region is completely outside of the file.
142 * This classification is stable under DLM lock already acquired by
143 * the caller, because to change the class, other client has to take
144 * DLM lock conflicting with our lock. Also, any updates to ->i_size
145 * by other threads on this client are serialized by
146 * ll_inode_size_lock(). This guarantees that short reads are handled
147 * correctly in the face of concurrent writes and truncates.
149 vvp_object_size_lock(obj);
150 result = cl_object_attr_get(env, obj, attr);
153 if (pos > kms || !attr->cat_kms_valid) {
155 * A glimpse is necessary to determine whether we
156 * return a short read (B) or some zeroes at the end
159 vvp_object_size_unlock(obj);
160 result = cl_glimpse_lock(env, io, inode, obj, 0);
161 if (result == 0 && exceed != NULL) {
162 /* If objective page index exceed end-of-file
163 * page index, return directly. Do not expect
164 * kernel will check such case correctly.
165 * linux-2.6.18-128.1.1 miss to do that.
167 loff_t size = i_size_read(inode);
168 unsigned long cur_index = start >>
171 if ((size == 0 && cur_index != 0) ||
172 (((size - 1) >> PAGE_SHIFT) <
180 * region is within kms and, hence, within real file
181 * size (A). We need to increase i_size to cover the
182 * read region so that generic_file_read() will do its
183 * job, but that doesn't mean the kms size is
184 * _correct_, it is only the _minimum_ size. If
185 * someone does a stat they will get the correct size
186 * which will always be >= the kms value here.
189 if (i_size_read(inode) < kms) {
190 i_size_write(inode, kms);
192 DFID" updating i_size %llu\n",
193 PFID(lu_object_fid(&obj->co_lu)),
194 (__u64)i_size_read(inode));
199 vvp_object_size_unlock(obj);
204 /*****************************************************************************
210 static int vvp_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
211 __u32 enqflags, enum cl_lock_mode mode,
212 pgoff_t start, pgoff_t end)
214 struct vvp_io *vio = vvp_env_io(env);
215 struct cl_lock_descr *descr = &vio->vui_link.cill_descr;
216 struct cl_object *obj = io->ci_obj;
218 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
221 CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
223 memset(&vio->vui_link, 0, sizeof vio->vui_link);
225 if (vio->vui_fd && (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
226 descr->cld_mode = CLM_GROUP;
227 descr->cld_gid = vio->vui_fd->fd_grouplock.lg_gid;
228 enqflags |= CEF_LOCK_MATCH;
230 descr->cld_mode = mode;
233 descr->cld_obj = obj;
234 descr->cld_start = start;
235 descr->cld_end = end;
236 descr->cld_enq_flags = enqflags;
238 cl_io_lock_add(env, io, &vio->vui_link);
243 static int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io,
244 __u32 enqflags, enum cl_lock_mode mode,
245 loff_t start, loff_t end)
247 struct cl_object *obj = io->ci_obj;
249 return vvp_io_one_lock_index(env, io, enqflags, mode,
250 cl_index(obj, start), cl_index(obj, end));
253 static int vvp_io_write_iter_init(const struct lu_env *env,
254 const struct cl_io_slice *ios)
256 struct vvp_io *vio = cl2vvp_io(env, ios);
258 cl_page_list_init(&vio->u.readwrite.vui_queue);
259 vio->u.readwrite.vui_written = 0;
260 vio->u.readwrite.vui_from = 0;
261 vio->u.readwrite.vui_to = PAGE_SIZE;
266 static int vvp_io_read_iter_init(const struct lu_env *env,
267 const struct cl_io_slice *ios)
269 struct vvp_io *vio = cl2vvp_io(env, ios);
271 vio->u.readwrite.vui_read = 0;
276 static void vvp_io_write_iter_fini(const struct lu_env *env,
277 const struct cl_io_slice *ios)
279 struct vvp_io *vio = cl2vvp_io(env, ios);
281 LASSERT(vio->u.readwrite.vui_queue.pl_nr == 0);
284 static int vvp_io_fault_iter_init(const struct lu_env *env,
285 const struct cl_io_slice *ios)
287 struct vvp_io *vio = cl2vvp_io(env, ios);
288 struct inode *inode = vvp_object_inode(ios->cis_obj);
290 LASSERT(inode == file_inode(vio->vui_fd->fd_file));
295 static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
297 struct cl_io *io = ios->cis_io;
298 struct cl_object *obj = io->ci_obj;
299 struct vvp_io *vio = cl2vvp_io(env, ios);
300 struct inode *inode = vvp_object_inode(obj);
305 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
307 CDEBUG(D_VFSTRACE, DFID" ignore/verify layout %d/%d, layout version %d "
308 "need write layout %d, restore needed %d\n",
309 PFID(lu_object_fid(&obj->co_lu)),
310 io->ci_ignore_layout, io->ci_verify_layout,
311 vio->vui_layout_gen, io->ci_need_write_intent,
312 io->ci_restore_needed);
314 if (io->ci_restore_needed) {
315 /* file was detected release, we need to restore it
316 * before finishing the io
318 rc = ll_layout_restore(inode, 0, OBD_OBJECT_EOF);
319 /* if restore registration failed, no restart,
320 * we will return -ENODATA */
321 /* The layout will change after restore, so we need to
322 * block on layout lock held by the MDT
323 * as MDT will not send new layout in lvb (see LU-3124)
324 * we have to explicitly fetch it, all this will be done
325 * by ll_layout_refresh().
326 * Even if ll_layout_restore() returns zero, it doesn't mean
327 * that restore has been successful. Therefore it sets
328 * ci_verify_layout so that it will check layout at the end
332 io->ci_restore_needed = 1;
333 io->ci_need_restart = 0;
334 io->ci_verify_layout = 0;
339 io->ci_restore_needed = 0;
341 /* Even if ll_layout_restore() returns zero, it doesn't mean
342 * that restore has been successful. Therefore it should verify
343 * if there was layout change and restart I/O correspondingly.
345 ll_layout_refresh(inode, &gen);
346 io->ci_need_restart = vio->vui_layout_gen != gen;
347 if (io->ci_need_restart) {
349 DFID" layout changed from %d to %d.\n",
350 PFID(lu_object_fid(&obj->co_lu)),
351 vio->vui_layout_gen, gen);
352 /* today successful restore is the only possible
354 /* restore was done, clear restoring state */
355 clear_bit(LLIF_FILE_RESTORING,
356 &ll_i2info(vvp_object_inode(obj))->lli_flags);
362 * dynamic layout change needed, send layout intent
365 if (io->ci_need_write_intent) {
366 enum layout_intent_opc opc = LAYOUT_INTENT_WRITE;
368 io->ci_need_write_intent = 0;
370 LASSERT(io->ci_type == CIT_WRITE || cl_io_is_fallocate(io) ||
371 cl_io_is_trunc(io) || cl_io_is_mkwrite(io));
373 CDEBUG(D_VFSTRACE, DFID" write layout, type %u "DEXT"\n",
374 PFID(lu_object_fid(&obj->co_lu)), io->ci_type,
375 PEXT(&io->ci_write_intent));
377 if (cl_io_is_trunc(io))
378 opc = LAYOUT_INTENT_TRUNC;
380 rc = ll_layout_write_intent(inode, opc, &io->ci_write_intent);
383 io->ci_need_restart = 1;
387 if (!io->ci_need_restart &&
388 !io->ci_ignore_layout && io->ci_verify_layout) {
389 /* check layout version */
390 ll_layout_refresh(inode, &gen);
391 io->ci_need_restart = vio->vui_layout_gen != gen;
392 if (io->ci_need_restart) {
394 DFID" layout changed from %d to %d.\n",
395 PFID(lu_object_fid(&obj->co_lu)),
396 vio->vui_layout_gen, gen);
404 static void vvp_io_fault_fini(const struct lu_env *env,
405 const struct cl_io_slice *ios)
407 struct cl_io *io = ios->cis_io;
408 struct cl_page *page = io->u.ci_fault.ft_page;
410 CLOBINVRNT(env, io->ci_obj, vvp_object_invariant(io->ci_obj));
413 lu_ref_del(&page->cp_reference, "fault", io);
414 cl_page_put(env, page);
415 io->u.ci_fault.ft_page = NULL;
417 vvp_io_fini(env, ios);
420 static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
423 * we only want to hold PW locks if the mmap() can generate
424 * writes back to the file and that only happens in shared
427 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
432 static int vvp_mmap_locks(const struct lu_env *env,
433 struct vvp_io *vio, struct cl_io *io)
435 struct vvp_thread_info *vti = vvp_env_info(env);
436 struct mm_struct *mm = current->mm;
437 struct vm_area_struct *vma;
438 struct cl_lock_descr *descr = &vti->vti_descr;
439 union ldlm_policy_data policy;
447 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
449 /* nfs or loop back device write */
450 if (vio->vui_iter == NULL)
453 /* No MM (e.g. NFS)? No vmas too. */
457 if (!iter_is_iovec(vio->vui_iter) && !iov_iter_is_kvec(vio->vui_iter))
460 for (i = *vio->vui_iter;
462 iov_iter_advance(&i, iov.iov_len)) {
463 iov = iov_iter_iovec(&i);
464 addr = (unsigned long)iov.iov_base;
470 count += addr & ~PAGE_MASK;
474 while ((vma = our_vma(mm, addr, count)) != NULL) {
475 struct dentry *de = file_dentry(vma->vm_file);
476 struct inode *inode = de->d_inode;
477 int flags = CEF_MUST;
479 if (ll_file_nolock(vma->vm_file)) {
481 * For no lock case is not allowed for mmap
488 * XXX: Required lock mode can be weakened: CIT_WRITE
489 * io only ever reads user level buffer, and CIT_READ
492 policy_from_vma(&policy, vma, addr, count);
493 descr->cld_mode = vvp_mode_from_vma(vma);
494 descr->cld_obj = ll_i2info(inode)->lli_clob;
495 descr->cld_start = cl_index(descr->cld_obj,
496 policy.l_extent.start);
497 descr->cld_end = cl_index(descr->cld_obj,
498 policy.l_extent.end);
499 descr->cld_enq_flags = flags;
500 result = cl_io_lock_alloc_add(env, io, descr);
502 CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
503 descr->cld_mode, descr->cld_start,
509 if (vma->vm_end - addr >= count)
512 count -= vma->vm_end - addr;
515 mmap_read_unlock(mm);
522 static void vvp_io_advance(const struct lu_env *env,
523 const struct cl_io_slice *ios,
526 struct cl_object *obj = ios->cis_io->ci_obj;
527 struct vvp_io *vio = cl2vvp_io(env, ios);
529 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
532 * Since 3.16(26978b8b4) vfs revert iov iter to
533 * original position even io succeed, so instead
534 * of relying on VFS, we move iov iter by ourselves.
536 iov_iter_advance(vio->vui_iter, nob);
537 CDEBUG(D_VFSTRACE, "advancing %ld bytes\n", nob);
538 vio->vui_tot_count -= nob;
539 iov_iter_reexpand(vio->vui_iter, vio->vui_tot_count);
542 static void vvp_io_update_iov(const struct lu_env *env,
543 struct vvp_io *vio, struct cl_io *io)
545 size_t size = io->u.ci_rw.crw_count;
550 iov_iter_truncate(vio->vui_iter, size);
553 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
554 enum cl_lock_mode mode, loff_t start, loff_t end)
556 struct vvp_io *vio = vvp_env_io(env);
560 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
563 vvp_io_update_iov(env, vio, io);
565 if (io->u.ci_rw.crw_nonblock)
566 ast_flags |= CEF_NONBLOCK;
567 if (io->ci_lock_no_expand)
568 ast_flags |= CEF_LOCK_NO_EXPAND;
570 /* Group lock held means no lockless any more */
571 if (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)
574 if (ll_file_nolock(vio->vui_fd->fd_file) ||
575 (vio->vui_fd->fd_file->f_flags & O_DIRECT &&
577 ast_flags |= CEF_NEVER;
580 result = vvp_mmap_locks(env, vio, io);
582 result = vvp_io_one_lock(env, io, ast_flags, mode, start, end);
587 static int vvp_io_read_lock(const struct lu_env *env,
588 const struct cl_io_slice *ios)
590 struct cl_io *io = ios->cis_io;
591 struct cl_io_rw_common *rd = &io->u.ci_rd.rd;
595 result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
596 rd->crw_pos + rd->crw_count - 1);
600 static int vvp_io_fault_lock(const struct lu_env *env,
601 const struct cl_io_slice *ios)
603 struct cl_io *io = ios->cis_io;
604 struct vvp_io *vio = cl2vvp_io(env, ios);
606 * XXX LDLM_FL_CBPENDING
608 return vvp_io_one_lock_index(env,
610 vvp_mode_from_vma(vio->u.fault.ft_vma),
611 io->u.ci_fault.ft_index,
612 io->u.ci_fault.ft_index);
615 static int vvp_io_write_lock(const struct lu_env *env,
616 const struct cl_io_slice *ios)
618 struct cl_io *io = ios->cis_io;
622 if (io->u.ci_wr.wr_append) {
624 end = OBD_OBJECT_EOF;
626 start = io->u.ci_wr.wr.crw_pos;
627 end = start + io->u.ci_wr.wr.crw_count - 1;
630 RETURN(vvp_io_rw_lock(env, io, CLM_WRITE, start, end));
633 static int vvp_io_setattr_iter_init(const struct lu_env *env,
634 const struct cl_io_slice *ios)
641 * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
643 * Handles "lockless io" mode when extent locking is done by server.
645 static int vvp_io_setattr_lock(const struct lu_env *env,
646 const struct cl_io_slice *ios)
648 struct cl_io *io = ios->cis_io;
649 __u64 lock_start = 0;
650 __u64 lock_end = OBD_OBJECT_EOF;
653 if (cl_io_is_trunc(io)) {
654 struct inode *inode = vvp_object_inode(io->ci_obj);
656 /* set enqueue flags to CEF_MUST in case of encrypted file,
657 * to prevent lockless truncate
659 if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
661 else if (io->u.ci_setattr.sa_attr.lvb_size == 0)
662 enqflags = CEF_DISCARD_DATA;
663 } else if (cl_io_is_fallocate(io)) {
664 lock_start = io->u.ci_setattr.sa_falloc_offset;
665 lock_end = io->u.ci_setattr.sa_falloc_end - 1;
667 unsigned int valid = io->u.ci_setattr.sa_avalid;
669 if (!(valid & TIMES_SET_FLAGS))
672 if ((!(valid & ATTR_MTIME) ||
673 io->u.ci_setattr.sa_attr.lvb_mtime >=
674 io->u.ci_setattr.sa_attr.lvb_ctime) &&
675 (!(valid & ATTR_ATIME) ||
676 io->u.ci_setattr.sa_attr.lvb_atime >=
677 io->u.ci_setattr.sa_attr.lvb_ctime))
681 return vvp_io_one_lock(env, io, enqflags, CLM_WRITE,
682 lock_start, lock_end);
685 static int vvp_do_vmtruncate(struct inode *inode, size_t size)
690 * Only ll_inode_size_lock is taken at this level.
692 ll_inode_size_lock(inode);
693 result = inode_newsize_ok(inode, size);
695 ll_inode_size_unlock(inode);
698 i_size_write(inode, size);
700 ll_truncate_pagecache(inode, size);
701 ll_inode_size_unlock(inode);
705 static int vvp_io_setattr_time(const struct lu_env *env,
706 const struct cl_io_slice *ios)
708 struct cl_io *io = ios->cis_io;
709 struct cl_object *obj = io->ci_obj;
710 struct cl_attr *attr = vvp_env_thread_attr(env);
712 unsigned valid = CAT_CTIME;
714 cl_object_attr_lock(obj);
715 attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
716 if (io->u.ci_setattr.sa_avalid & ATTR_ATIME_SET) {
717 attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
720 if (io->u.ci_setattr.sa_avalid & ATTR_MTIME_SET) {
721 attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
724 result = cl_object_attr_update(env, obj, attr, valid);
725 cl_object_attr_unlock(obj);
730 static int vvp_io_setattr_start(const struct lu_env *env,
731 const struct cl_io_slice *ios)
733 struct cl_io *io = ios->cis_io;
734 struct inode *inode = vvp_object_inode(io->ci_obj);
735 struct ll_inode_info *lli = ll_i2info(inode);
736 int mode = io->u.ci_setattr.sa_falloc_mode;
738 if (cl_io_is_trunc(io)) {
739 trunc_sem_down_write(&lli->lli_trunc_sem);
740 mutex_lock(&lli->lli_setattr_mutex);
741 inode_dio_wait(inode);
742 } else if (cl_io_is_fallocate(io)) {
745 trunc_sem_down_write(&lli->lli_trunc_sem);
746 mutex_lock(&lli->lli_setattr_mutex);
747 inode_dio_wait(inode);
749 ll_merge_attr(env, inode);
750 size = i_size_read(inode);
751 if (io->u.ci_setattr.sa_falloc_end > size &&
752 !(mode & FALLOC_FL_KEEP_SIZE)) {
753 size = io->u.ci_setattr.sa_falloc_end;
754 io->u.ci_setattr.sa_avalid |= ATTR_SIZE;
756 io->u.ci_setattr.sa_attr.lvb_size = size;
758 mutex_lock(&lli->lli_setattr_mutex);
761 if (io->u.ci_setattr.sa_avalid & TIMES_SET_FLAGS)
762 return vvp_io_setattr_time(env, ios);
767 static void vvp_io_setattr_end(const struct lu_env *env,
768 const struct cl_io_slice *ios)
770 struct cl_io *io = ios->cis_io;
771 struct inode *inode = vvp_object_inode(io->ci_obj);
772 struct ll_inode_info *lli = ll_i2info(inode);
774 if (cl_io_is_trunc(io)) {
775 /* Truncate in memory pages - they must be clean pages
776 * because osc has already notified to destroy osc_extents. */
777 vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
778 mutex_unlock(&lli->lli_setattr_mutex);
779 trunc_sem_up_write(&lli->lli_trunc_sem);
780 } else if (cl_io_is_fallocate(io)) {
781 mutex_unlock(&lli->lli_setattr_mutex);
782 trunc_sem_up_write(&lli->lli_trunc_sem);
784 mutex_unlock(&lli->lli_setattr_mutex);
788 static void vvp_io_setattr_fini(const struct lu_env *env,
789 const struct cl_io_slice *ios)
791 bool restore_needed = ios->cis_io->ci_restore_needed;
792 struct inode *inode = vvp_object_inode(ios->cis_obj);
794 vvp_io_fini(env, ios);
796 if (restore_needed && !ios->cis_io->ci_restore_needed) {
797 /* restore finished, set data modified flag for HSM */
798 set_bit(LLIF_DATA_MODIFIED, &ll_i2info(inode)->lli_flags);
802 static int vvp_io_read_start(const struct lu_env *env,
803 const struct cl_io_slice *ios)
805 struct vvp_io *vio = cl2vvp_io(env, ios);
806 struct cl_io *io = ios->cis_io;
807 struct cl_object *obj = io->ci_obj;
808 struct inode *inode = vvp_object_inode(obj);
809 struct ll_inode_info *lli = ll_i2info(inode);
810 struct file *file = vio->vui_fd->fd_file;
811 loff_t pos = io->u.ci_rd.rd.crw_pos;
812 size_t cnt = io->u.ci_rd.rd.crw_count;
813 size_t tot = vio->vui_tot_count;
816 struct iov_iter iter;
821 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
823 CDEBUG(D_VFSTRACE, "%s: read [%llu, %llu)\n",
824 file_dentry(file)->d_name.name,
827 trunc_sem_down_read(&lli->lli_trunc_sem);
829 if (io->ci_async_readahead) {
834 if (!can_populate_pages(env, io, inode))
837 if (!(file->f_flags & O_DIRECT)) {
838 result = cl_io_lru_reserve(env, io, pos, cnt);
843 /* Unless this is reading a sparse file, otherwise the lock has already
844 * been acquired so vvp_prep_size() is an empty op. */
845 result = vvp_prep_size(env, obj, io, pos, cnt, &exceed);
848 else if (exceed != 0)
851 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
852 "Read ino %lu, %zu bytes, offset %lld, size %llu\n",
853 inode->i_ino, cnt, pos, i_size_read(inode));
855 /* initialize read-ahead window once per syscall */
856 if (!vio->vui_ra_valid) {
857 vio->vui_ra_valid = true;
858 vio->vui_ra_start_idx = cl_index(obj, pos);
859 vio->vui_ra_pages = 0;
860 page_offset = pos & ~PAGE_MASK;
863 if (tot > PAGE_SIZE - page_offset)
864 tot -= (PAGE_SIZE - page_offset);
868 vio->vui_ra_pages += (tot + PAGE_SIZE - 1) >> PAGE_SHIFT;
870 CDEBUG(D_READA, "tot %zu, ra_start %lu, ra_count %lu\n",
871 vio->vui_tot_count, vio->vui_ra_start_idx,
877 LASSERT(vio->vui_iocb->ki_pos == pos);
878 iter = *vio->vui_iter;
879 result = generic_file_read_iter(vio->vui_iocb, &iter);
884 io->ci_nob += result;
886 } else if (result == -EIOCBQUEUED) {
887 io->ci_nob += vio->u.readwrite.vui_read;
888 vio->vui_iocb->ki_pos = pos + vio->u.readwrite.vui_read;
894 static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io,
895 struct cl_page_list *plist, int from, int to)
897 struct cl_2queue *queue = &io->ci_queue;
898 struct cl_page *page;
899 unsigned int bytes = 0;
903 if (plist->pl_nr == 0)
906 if (from > 0 || to != PAGE_SIZE) {
907 page = cl_page_list_first(plist);
908 if (plist->pl_nr == 1) {
909 cl_page_clip(env, page, from, to);
912 cl_page_clip(env, page, from, PAGE_SIZE);
913 if (to != PAGE_SIZE) {
914 page = cl_page_list_last(plist);
915 cl_page_clip(env, page, 0, to);
920 cl_2queue_init(queue);
921 cl_page_list_splice(plist, &queue->c2_qin);
922 rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0);
924 /* plist is not sorted any more */
925 cl_page_list_splice(&queue->c2_qin, plist);
926 cl_page_list_splice(&queue->c2_qout, plist);
927 cl_2queue_fini(env, queue);
930 /* calculate bytes */
931 bytes = plist->pl_nr << PAGE_SHIFT;
932 bytes -= from + PAGE_SIZE - to;
934 while (plist->pl_nr > 0) {
935 page = cl_page_list_first(plist);
936 cl_page_list_del(env, plist, page);
938 cl_page_clip(env, page, 0, PAGE_SIZE);
940 SetPageUptodate(cl_page_vmpage(page));
941 cl_page_disown(env, io, page);
943 /* held in ll_cl_init() */
944 lu_ref_del(&page->cp_reference, "cl_io", io);
945 cl_page_put(env, page);
949 RETURN(bytes > 0 ? bytes : rc);
953 * From kernel v4.19-rc5-248-g9b89a0355144 use XArrary
954 * Prior kernels use radix_tree for tags
956 static inline void ll_page_tag_dirty(struct page *page,
957 struct address_space *mapping)
959 #ifndef HAVE_RADIX_TREE_TAG_SET
960 __xa_set_mark(&mapping->i_pages, page_index(page), PAGECACHE_TAG_DIRTY);
962 radix_tree_tag_set(&mapping->page_tree, page_index(page),
963 PAGECACHE_TAG_DIRTY);
968 * Kernels 4.2 - 4.5 pass memcg argument to account_page_dirtied()
969 * Kernel v5.2-5678-gac1c3e4 no longer exports account_page_dirtied
971 static inline void ll_account_page_dirtied(struct page *page,
972 struct address_space *mapping)
974 #ifdef HAVE_ACCOUNT_PAGE_DIRTIED_3ARGS
975 struct mem_cgroup *memcg = mem_cgroup_begin_page_stat(page);
977 account_page_dirtied(page, mapping, memcg);
978 mem_cgroup_end_page_stat(memcg);
979 #elif defined(HAVE_ACCOUNT_PAGE_DIRTIED_EXPORT)
980 account_page_dirtied(page, mapping);
982 vvp_account_page_dirtied(page, mapping);
984 ll_page_tag_dirty(page, mapping);
987 /* Taken from kernel set_page_dirty, __set_page_dirty_nobuffers
988 * Last change to this area: b93b016313b3ba8003c3b8bb71f569af91f19fc7
990 * Current with Linus tip of tree (7/13/2019):
991 * v5.2-rc4-224-ge01e060fe0
993 * Backwards compat for 3.x, 5.x kernels relating to memcg handling
994 * & rename of radix tree to xarray.
996 void vvp_set_pagevec_dirty(struct pagevec *pvec)
998 struct page *page = pvec->pages[0];
999 int count = pagevec_count(pvec);
1001 #ifdef HAVE_KALLSYMS_LOOKUP_NAME
1002 struct address_space *mapping = page->mapping;
1003 unsigned long flags;
1004 unsigned long skip_pages = 0;
1010 BUILD_BUG_ON(PAGEVEC_SIZE > BITS_PER_LONG);
1011 LASSERTF(page->mapping,
1012 "mapping must be set. page %p, page->private (cl_page) %p\n",
1013 page, (void *) page->private);
1015 /* kernels without HAVE_KALLSYMS_LOOKUP_NAME also don't have account_dirty_page
1016 * exported, and if we can't access that symbol, we can't do page dirtying in
1017 * batch (taking the xarray lock only once) so we just fall back to a looped
1018 * call to __set_page_dirty_nobuffers
1020 #ifndef HAVE_KALLSYMS_LOOKUP_NAME
1021 for (i = 0; i < count; i++)
1022 __set_page_dirty_nobuffers(pvec->pages[i]);
1025 * In kernel 5.14.21, kallsyms_lookup_name is defined but
1026 * account_page_dirtied is not exported.
1028 if (!vvp_account_page_dirtied) {
1029 for (i = 0; i < count; i++)
1030 __set_page_dirty_nobuffers(pvec->pages[i]);
1034 for (i = 0; i < count; i++) {
1035 page = pvec->pages[i];
1037 ClearPageReclaim(page);
1039 lock_page_memcg(page);
1040 if (TestSetPageDirty(page)) {
1041 /* page is already dirty .. no extra work needed
1042 * set a flag for the i'th page to be skipped
1044 unlock_page_memcg(page);
1045 skip_pages |= (1 << i);
1049 ll_xa_lock_irqsave(&mapping->i_pages, flags);
1051 /* Notes on differences with __set_page_dirty_nobuffers:
1052 * 1. We don't need to call page_mapping because we know this is a page
1054 * 2. We have the pages locked, so there is no need for the careful
1055 * mapping/mapping2 dance.
1056 * 3. No mapping is impossible. (Race w/truncate mentioned in
1057 * dirty_nobuffers should be impossible because we hold the page lock.)
1058 * 4. All mappings are the same because i/o is only to one file.
1060 for (i = 0; i < count; i++) {
1061 page = pvec->pages[i];
1062 /* if the i'th page was unlocked above, skip it here */
1063 if ((skip_pages >> i) & 1)
1066 LASSERTF(page->mapping == mapping,
1067 "all pages must have the same mapping. page %p, mapping %p, first mapping %p\n",
1068 page, page->mapping, mapping);
1069 WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
1070 ll_account_page_dirtied(page, mapping);
1072 unlock_page_memcg(page);
1074 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1076 CDEBUG(D_VFSTRACE, "mapping %p, count %d, dirtied %d\n", mapping,
1079 if (mapping->host && dirtied) {
1080 /* !PageAnon && !swapper_space */
1081 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
1088 static void write_commit_callback(const struct lu_env *env, struct cl_io *io,
1089 struct pagevec *pvec)
1096 count = pagevec_count(pvec);
1099 for (i = 0; i < count; i++) {
1100 struct page *vmpage = pvec->pages[i];
1101 SetPageUptodate(vmpage);
1104 vvp_set_pagevec_dirty(pvec);
1106 for (i = 0; i < count; i++) {
1107 struct page *vmpage = pvec->pages[i];
1108 struct cl_page *page = (struct cl_page *) vmpage->private;
1109 cl_page_disown(env, io, page);
1110 lu_ref_del(&page->cp_reference, "cl_io", cl_io_top(io));
1111 cl_page_put(env, page);
1117 /* make sure the page list is contiguous */
1118 static bool page_list_sanity_check(struct cl_object *obj,
1119 struct cl_page_list *plist)
1121 struct cl_page *page;
1122 pgoff_t index = CL_PAGE_EOF;
1124 cl_page_list_for_each(page, plist) {
1125 if (index == CL_PAGE_EOF) {
1126 index = cl_page_index(page);
1131 if (index == cl_page_index(page))
1139 /* Return how many bytes have queued or written */
1140 int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io)
1142 struct cl_object *obj = io->ci_obj;
1143 struct inode *inode = vvp_object_inode(obj);
1144 struct vvp_io *vio = vvp_env_io(env);
1145 struct cl_page_list *queue = &vio->u.readwrite.vui_queue;
1146 struct cl_page *page;
1149 unsigned int npages = vio->u.readwrite.vui_queue.pl_nr;
1155 CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n",
1156 npages, vio->u.readwrite.vui_from, vio->u.readwrite.vui_to);
1158 LASSERT(page_list_sanity_check(obj, queue));
1160 /* submit IO with async write */
1161 rc = cl_io_commit_async(env, io, queue,
1162 vio->u.readwrite.vui_from,
1163 vio->u.readwrite.vui_to,
1164 write_commit_callback);
1165 npages -= queue->pl_nr; /* already committed pages */
1167 /* calculate how many bytes were written */
1168 bytes = npages << PAGE_SHIFT;
1171 bytes -= vio->u.readwrite.vui_from;
1172 if (queue->pl_nr == 0) /* last page */
1173 bytes -= PAGE_SIZE - vio->u.readwrite.vui_to;
1174 LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
1176 vio->u.readwrite.vui_written += bytes;
1178 CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
1179 npages, bytes, vio->u.readwrite.vui_written);
1181 /* the first page must have been written. */
1182 vio->u.readwrite.vui_from = 0;
1184 LASSERT(page_list_sanity_check(obj, queue));
1185 LASSERT(ergo(rc == 0, queue->pl_nr == 0));
1187 /* out of quota, try sync write */
1188 if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) {
1189 struct ll_inode_info *lli = ll_i2info(inode);
1191 rc = vvp_io_commit_sync(env, io, queue,
1192 vio->u.readwrite.vui_from,
1193 vio->u.readwrite.vui_to);
1195 vio->u.readwrite.vui_written += rc;
1198 if (lli->lli_clob != NULL)
1199 lov_read_and_clear_async_rc(lli->lli_clob);
1200 lli->lli_async_rc = 0;
1203 /* update inode size */
1204 ll_merge_attr(env, inode);
1206 /* Now the pages in queue were failed to commit, discard them
1207 * unless they were dirtied before. */
1208 while (queue->pl_nr > 0) {
1209 page = cl_page_list_first(queue);
1210 cl_page_list_del(env, queue, page);
1212 if (!PageDirty(cl_page_vmpage(page)))
1213 cl_page_discard(env, io, page);
1215 cl_page_disown(env, io, page);
1217 /* held in ll_cl_init() */
1218 lu_ref_del(&page->cp_reference, "cl_io", io);
1219 cl_page_put(env, page);
1221 cl_page_list_fini(env, queue);
1226 static int vvp_io_write_start(const struct lu_env *env,
1227 const struct cl_io_slice *ios)
1229 struct vvp_io *vio = cl2vvp_io(env, ios);
1230 struct cl_io *io = ios->cis_io;
1231 struct cl_object *obj = io->ci_obj;
1232 struct inode *inode = vvp_object_inode(obj);
1233 struct ll_inode_info *lli = ll_i2info(inode);
1234 struct file *file = vio->vui_fd->fd_file;
1236 loff_t pos = io->u.ci_wr.wr.crw_pos;
1237 size_t cnt = io->u.ci_wr.wr.crw_count;
1238 bool lock_inode = !IS_NOSEC(inode);
1239 size_t nob = io->ci_nob;
1240 struct iov_iter iter;
1245 trunc_sem_down_read(&lli->lli_trunc_sem);
1247 if (!can_populate_pages(env, io, inode))
1250 if (cl_io_is_append(io)) {
1252 * PARALLEL IO This has to be changed for parallel IO doing
1253 * out-of-order writes.
1255 ll_merge_attr(env, inode);
1256 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
1257 vio->vui_iocb->ki_pos = pos;
1259 LASSERTF(vio->vui_iocb->ki_pos == pos,
1260 "ki_pos %lld [%lld, %lld)\n",
1261 vio->vui_iocb->ki_pos,
1265 CDEBUG(D_VFSTRACE, "%s: write [%llu, %llu)\n",
1266 file_dentry(file)->d_name.name,
1269 /* The maximum Lustre file size is variable, based on the OST maximum
1270 * object size and number of stripes. This needs another check in
1271 * addition to the VFS checks earlier. */
1272 if (pos + cnt > ll_file_maxbytes(inode)) {
1274 "%s: file %s ("DFID") offset %llu > maxbytes %llu\n",
1275 ll_i2sbi(inode)->ll_fsname,
1276 file_dentry(file)->d_name.name,
1277 PFID(ll_inode2fid(inode)), pos + cnt,
1278 ll_file_maxbytes(inode));
1282 /* Tests to verify we take the i_mutex correctly */
1283 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_SEC) && !lock_inode)
1286 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_NOSEC) && lock_inode)
1289 if (!(file->f_flags & O_DIRECT)) {
1290 result = cl_io_lru_reserve(env, io, pos, cnt);
1295 if (vio->vui_iter == NULL) {
1296 /* from a temp io in ll_cl_init(). */
1300 * When using the locked AIO function (generic_file_aio_write())
1301 * testing has shown the inode mutex to be a limiting factor
1302 * with multi-threaded single shared file performance. To get
1303 * around this, we now use the lockless version. To maintain
1304 * consistency, proper locking to protect against writes,
1305 * trucates, etc. is handled in the higher layers of lustre.
1307 lock_inode = !IS_NOSEC(inode);
1308 iter = *vio->vui_iter;
1310 if (unlikely(lock_inode))
1312 result = __generic_file_write_iter(vio->vui_iocb, &iter);
1313 if (unlikely(lock_inode))
1314 inode_unlock(inode);
1318 #ifdef HAVE_GENERIC_WRITE_SYNC_2ARGS
1319 result = generic_write_sync(vio->vui_iocb, result);
1324 err = generic_write_sync(vio->vui_iocb->ki_filp, pos,
1326 if (err < 0 && result > 0)
1333 result = vvp_io_write_commit(env, io);
1334 /* Simulate short commit */
1335 if (CFS_FAULT_CHECK(OBD_FAIL_LLITE_SHORT_COMMIT)) {
1336 vio->u.readwrite.vui_written >>= 1;
1337 if (vio->u.readwrite.vui_written > 0)
1338 io->ci_need_restart = 1;
1340 if (vio->u.readwrite.vui_written > 0) {
1341 result = vio->u.readwrite.vui_written;
1342 CDEBUG(D_VFSTRACE, "%s: write nob %zd, result: %zd\n",
1343 file_dentry(file)->d_name.name,
1344 io->ci_nob, result);
1345 io->ci_nob += result;
1347 io->ci_continue = 0;
1350 if (vio->vui_iocb->ki_pos != (pos + io->ci_nob - nob)) {
1352 "%s: write position mismatch: ki_pos %lld vs. pos %lld, written %zd, commit %zd: rc = %zd\n",
1353 file_dentry(file)->d_name.name,
1354 vio->vui_iocb->ki_pos, pos + io->ci_nob - nob,
1355 written, io->ci_nob - nob, result);
1357 * Rewind ki_pos and vui_iter to where it has
1358 * successfully committed.
1360 vio->vui_iocb->ki_pos = pos + io->ci_nob - nob;
1362 if (result > 0 || result == -EIOCBQUEUED) {
1363 set_bit(LLIF_DATA_MODIFIED, &ll_i2info(inode)->lli_flags);
1365 if (result != -EIOCBQUEUED && result < cnt)
1366 io->ci_continue = 0;
1370 if (result == -EIOCBQUEUED) {
1371 io->ci_nob += vio->u.readwrite.vui_written;
1372 vio->vui_iocb->ki_pos = pos +
1373 vio->u.readwrite.vui_written;
1380 static void vvp_io_rw_end(const struct lu_env *env,
1381 const struct cl_io_slice *ios)
1383 struct inode *inode = vvp_object_inode(ios->cis_obj);
1384 struct ll_inode_info *lli = ll_i2info(inode);
1386 trunc_sem_up_read(&lli->lli_trunc_sem);
1389 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
1391 struct vm_fault *vmf = cfio->ft_vmf;
1393 cfio->ft_flags = ll_filemap_fault(cfio->ft_vma, vmf);
1394 cfio->ft_flags_valid = 1;
1397 LL_CDEBUG_PAGE(D_PAGE, vmf->page, "got addr %p type NOPAGE\n",
1398 get_vmf_address(vmf));
1399 if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) {
1400 lock_page(vmf->page);
1401 cfio->ft_flags |= VM_FAULT_LOCKED;
1404 cfio->ft_vmpage = vmf->page;
1409 if (cfio->ft_flags & VM_FAULT_SIGBUS) {
1410 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", get_vmf_address(vmf));
1414 if (cfio->ft_flags & VM_FAULT_OOM) {
1415 CDEBUG(D_PAGE, "got addr %p - OOM\n", get_vmf_address(vmf));
1419 if (cfio->ft_flags & VM_FAULT_RETRY)
1422 CERROR("unknown error in page fault %d\n", cfio->ft_flags);
1427 static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io,
1428 struct pagevec *pvec)
1430 vvp_set_pagevec_dirty(pvec);
1433 static int vvp_io_fault_start(const struct lu_env *env,
1434 const struct cl_io_slice *ios)
1436 struct vvp_io *vio = cl2vvp_io(env, ios);
1437 struct cl_io *io = ios->cis_io;
1438 struct cl_object *obj = io->ci_obj;
1439 struct inode *inode = vvp_object_inode(obj);
1440 struct ll_inode_info *lli = ll_i2info(inode);
1441 struct cl_fault_io *fio = &io->u.ci_fault;
1442 struct vvp_fault_io *cfio = &vio->u.fault;
1445 struct page *vmpage = NULL;
1446 struct cl_page *page;
1451 trunc_sem_down_read_nowait(&lli->lli_trunc_sem);
1453 /* offset of the last byte on the page */
1454 offset = cl_offset(obj, fio->ft_index + 1) - 1;
1455 LASSERT(cl_index(obj, offset) == fio->ft_index);
1456 result = vvp_prep_size(env, obj, io, 0, offset + 1, NULL);
1460 /* must return locked page */
1461 if (fio->ft_mkwrite) {
1462 LASSERT(cfio->ft_vmpage != NULL);
1463 lock_page(cfio->ft_vmpage);
1465 result = vvp_io_kernel_fault(cfio);
1470 vmpage = cfio->ft_vmpage;
1471 LASSERT(PageLocked(vmpage));
1473 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
1474 generic_error_remove_page(vmpage->mapping, vmpage);
1476 size = i_size_read(inode);
1477 /* Though we have already held a cl_lock upon this page, but
1478 * it still can be truncated locally. */
1479 if (unlikely((vmpage->mapping != inode->i_mapping) ||
1480 (page_offset(vmpage) > size))) {
1481 CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
1483 /* return +1 to stop cl_io_loop() and ll_fault() will catch
1485 GOTO(out, result = +1);
1488 last_index = cl_index(obj, size - 1);
1490 if (fio->ft_mkwrite ) {
1492 * Capture the size while holding the lli_trunc_sem from above
1493 * we want to make sure that we complete the mkwrite action
1494 * while holding this lock. We need to make sure that we are
1495 * not past the end of the file.
1497 if (last_index < fio->ft_index) {
1499 "llite: mkwrite and truncate race happened: "
1500 "%p: 0x%lx 0x%lx\n",
1501 vmpage->mapping,fio->ft_index,last_index);
1503 * We need to return if we are
1504 * passed the end of the file. This will propagate
1505 * up the call stack to ll_page_mkwrite where
1506 * we will return VM_FAULT_NOPAGE. Any non-negative
1507 * value returned here will be silently
1508 * converted to 0. If the vmpage->mapping is null
1509 * the error code would be converted back to ENODATA
1510 * in ll_page_mkwrite0. Thus we return -ENODATA
1511 * to handle both cases
1513 GOTO(out, result = -ENODATA);
1517 page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
1519 GOTO(out, result = PTR_ERR(page));
1521 /* if page is going to be written, we should add this page into cache
1523 if (fio->ft_mkwrite) {
1524 wait_on_page_writeback(vmpage);
1525 if (!PageDirty(vmpage)) {
1526 struct cl_page_list *plist = &vio->u.fault.ft_queue;
1529 /* vvp_page_assume() calls wait_on_page_writeback(). */
1530 cl_page_assume(env, io, page);
1532 cl_page_list_init(plist);
1533 cl_page_list_add(plist, page, true);
1536 if (last_index == cl_page_index(page))
1537 to = ((size - 1) & ~PAGE_MASK) + 1;
1539 /* Do not set Dirty bit here so that in case IO is
1540 * started before the page is really made dirty, we
1541 * still have chance to detect it. */
1542 result = cl_io_commit_async(env, io, plist, 0, to,
1543 mkwrite_commit_callback);
1544 /* Have overquota flag, trying sync write to check
1545 * whether indeed out of quota */
1546 if (result == -EDQUOT) {
1548 result = vvp_io_commit_sync(env, io,
1552 cl_page_own(env, io, page);
1553 cl_page_list_add(plist, page, true);
1554 lu_ref_add(&page->cp_reference,
1556 result = cl_io_commit_async(env, io,
1558 mkwrite_commit_callback);
1561 cl_page_put(env, page);
1565 LASSERT(cl_page_is_owned(page, io));
1566 cl_page_list_fini(env, plist);
1570 cl_page_discard(env, io, page);
1571 cl_page_disown(env, io, page);
1573 cl_page_put(env, page);
1575 /* we're in big trouble, what can we do now? */
1576 if (result == -EDQUOT)
1580 cl_page_disown(env, io, page);
1586 * The ft_index is only used in the case of
1587 * a mkwrite action. We need to check
1588 * our assertions are correct, since
1589 * we should have caught this above
1591 LASSERT(!fio->ft_mkwrite || fio->ft_index <= last_index);
1592 if (fio->ft_index == last_index)
1594 * Last page is mapped partially.
1596 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
1598 fio->ft_nob = cl_page_size(obj);
1600 lu_ref_add(&page->cp_reference, "fault", io);
1601 fio->ft_page = page;
1605 /* return unlocked vmpage to avoid deadlocking */
1607 unlock_page(vmpage);
1609 cfio->ft_flags &= ~VM_FAULT_LOCKED;
1614 static void vvp_io_fault_end(const struct lu_env *env,
1615 const struct cl_io_slice *ios)
1617 struct inode *inode = vvp_object_inode(ios->cis_obj);
1618 struct ll_inode_info *lli = ll_i2info(inode);
1620 CLOBINVRNT(env, ios->cis_io->ci_obj,
1621 vvp_object_invariant(ios->cis_io->ci_obj));
1622 trunc_sem_up_read(&lli->lli_trunc_sem);
1625 static int vvp_io_fsync_start(const struct lu_env *env,
1626 const struct cl_io_slice *ios)
1628 /* we should mark TOWRITE bit to each dirty page in radix tree to
1629 * verify pages have been written, but this is difficult because of
1634 static int vvp_io_read_ahead(const struct lu_env *env,
1635 const struct cl_io_slice *ios,
1636 pgoff_t start, struct cl_read_ahead *ra)
1641 if (ios->cis_io->ci_type == CIT_READ ||
1642 ios->cis_io->ci_type == CIT_FAULT) {
1643 struct vvp_io *vio = cl2vvp_io(env, ios);
1645 if (unlikely(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
1646 ra->cra_end_idx = CL_PAGE_EOF;
1647 result = +1; /* no need to call down */
1654 static int vvp_io_lseek_lock(const struct lu_env *env,
1655 const struct cl_io_slice *ios)
1657 struct cl_io *io = ios->cis_io;
1658 __u64 lock_start = io->u.ci_lseek.ls_start;
1659 __u64 lock_end = OBD_OBJECT_EOF;
1660 __u32 enqflags = CEF_MUST; /* always take client lock */
1662 return vvp_io_one_lock(env, io, enqflags, CLM_READ,
1663 lock_start, lock_end);
1666 static int vvp_io_lseek_start(const struct lu_env *env,
1667 const struct cl_io_slice *ios)
1669 struct cl_io *io = ios->cis_io;
1670 struct inode *inode = vvp_object_inode(io->ci_obj);
1671 __u64 start = io->u.ci_lseek.ls_start;
1674 inode_dio_wait(inode);
1676 /* At the moment we have DLM lock so just update inode
1677 * to know the file size.
1679 ll_merge_attr(env, inode);
1680 if (start >= i_size_read(inode)) {
1681 io->u.ci_lseek.ls_result = -ENXIO;
1687 static void vvp_io_lseek_end(const struct lu_env *env,
1688 const struct cl_io_slice *ios)
1690 struct cl_io *io = ios->cis_io;
1691 struct inode *inode = vvp_object_inode(io->ci_obj);
1693 if (io->u.ci_lseek.ls_result > i_size_read(inode))
1694 io->u.ci_lseek.ls_result = -ENXIO;
1696 inode_unlock(inode);
1699 static const struct cl_io_operations vvp_io_ops = {
1702 .cio_fini = vvp_io_fini,
1703 .cio_iter_init = vvp_io_read_iter_init,
1704 .cio_lock = vvp_io_read_lock,
1705 .cio_start = vvp_io_read_start,
1706 .cio_end = vvp_io_rw_end,
1707 .cio_advance = vvp_io_advance,
1710 .cio_fini = vvp_io_fini,
1711 .cio_iter_init = vvp_io_write_iter_init,
1712 .cio_iter_fini = vvp_io_write_iter_fini,
1713 .cio_lock = vvp_io_write_lock,
1714 .cio_start = vvp_io_write_start,
1715 .cio_end = vvp_io_rw_end,
1716 .cio_advance = vvp_io_advance,
1719 .cio_fini = vvp_io_setattr_fini,
1720 .cio_iter_init = vvp_io_setattr_iter_init,
1721 .cio_lock = vvp_io_setattr_lock,
1722 .cio_start = vvp_io_setattr_start,
1723 .cio_end = vvp_io_setattr_end
1726 .cio_fini = vvp_io_fault_fini,
1727 .cio_iter_init = vvp_io_fault_iter_init,
1728 .cio_lock = vvp_io_fault_lock,
1729 .cio_start = vvp_io_fault_start,
1730 .cio_end = vvp_io_fault_end,
1733 .cio_start = vvp_io_fsync_start,
1734 .cio_fini = vvp_io_fini
1737 .cio_fini = vvp_io_fini
1740 .cio_fini = vvp_io_fini
1743 .cio_fini = vvp_io_fini
1746 .cio_fini = vvp_io_fini,
1747 .cio_lock = vvp_io_lseek_lock,
1748 .cio_start = vvp_io_lseek_start,
1749 .cio_end = vvp_io_lseek_end,
1752 .cio_read_ahead = vvp_io_read_ahead
1755 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
1758 struct vvp_io *vio = vvp_env_io(env);
1759 struct inode *inode = vvp_object_inode(obj);
1762 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
1765 CDEBUG(D_VFSTRACE, DFID" ignore/verify layout %d/%d, layout version %d "
1766 "restore needed %d\n",
1767 PFID(lu_object_fid(&obj->co_lu)),
1768 io->ci_ignore_layout, io->ci_verify_layout,
1769 vio->vui_layout_gen, io->ci_restore_needed);
1771 CL_IO_SLICE_CLEAN(vio, vui_cl);
1772 cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops);
1773 vio->vui_ra_valid = false;
1775 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
1777 struct ll_inode_info *lli = ll_i2info(inode);
1779 count = io->u.ci_rw.crw_count;
1780 /* "If nbyte is 0, read() will return 0 and have no other
1781 * results." -- Single Unix Spec */
1785 vio->vui_tot_count = count;
1787 /* for read/write, we store the jobid in the inode, and
1788 * it'll be fetched by osc when building RPC.
1790 * it's not accurate if the file is shared by different
1793 lustre_get_jobid(lli->lli_jobid, sizeof(lli->lli_jobid));
1794 } else if (io->ci_type == CIT_SETATTR) {
1795 if (!cl_io_is_trunc(io))
1796 io->ci_lockreq = CILR_MANDATORY;
1799 /* Enqueue layout lock and get layout version. We need to do this
1800 * even for operations requiring to open file, such as read and write,
1801 * because it might not grant layout lock in IT_OPEN. */
1802 if (result == 0 && !io->ci_ignore_layout) {
1803 result = ll_layout_refresh(inode, &vio->vui_layout_gen);
1804 if (result == -ENOENT)
1805 /* If the inode on MDS has been removed, but the objects
1806 * on OSTs haven't been destroyed (async unlink), layout
1807 * fetch will return -ENOENT, we'd ingore this error
1808 * and continue with dirty flush. LU-3230. */
1811 CERROR("%s: refresh file layout " DFID " error %d.\n",
1812 ll_i2sbi(inode)->ll_fsname,
1813 PFID(lu_object_fid(&obj->co_lu)), result);
1816 io->ci_result = result < 0 ? result : 0;