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/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_io for VVP layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_LLITE
41 #include <linux/pagevec.h>
42 #include <linux/memcontrol.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);
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 ll_file_clear_flag(ll_i2info(vvp_object_inode(obj)),
356 LLIF_FILE_RESTORING);
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 ||
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;
473 down_read(&mm->mmap_sem);
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 up_read(&mm->mmap_sem);
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 vio->vui_tot_count -= nob;
538 iov_iter_reexpand(vio->vui_iter, vio->vui_tot_count);
541 static void vvp_io_update_iov(const struct lu_env *env,
542 struct vvp_io *vio, struct cl_io *io)
544 size_t size = io->u.ci_rw.crw_count;
549 iov_iter_truncate(vio->vui_iter, size);
552 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
553 enum cl_lock_mode mode, loff_t start, loff_t end)
555 struct vvp_io *vio = vvp_env_io(env);
559 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
562 vvp_io_update_iov(env, vio, io);
564 if (io->u.ci_rw.crw_nonblock)
565 ast_flags |= CEF_NONBLOCK;
566 if (io->ci_lock_no_expand)
567 ast_flags |= CEF_LOCK_NO_EXPAND;
569 /* Group lock held means no lockless any more */
570 if (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)
573 if (ll_file_nolock(vio->vui_fd->fd_file) ||
574 (vio->vui_fd->fd_file->f_flags & O_DIRECT &&
576 ast_flags |= CEF_NEVER;
579 result = vvp_mmap_locks(env, vio, io);
581 result = vvp_io_one_lock(env, io, ast_flags, mode, start, end);
586 static int vvp_io_read_lock(const struct lu_env *env,
587 const struct cl_io_slice *ios)
589 struct cl_io *io = ios->cis_io;
590 struct cl_io_rw_common *rd = &io->u.ci_rd.rd;
594 result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
595 rd->crw_pos + rd->crw_count - 1);
599 static int vvp_io_fault_lock(const struct lu_env *env,
600 const struct cl_io_slice *ios)
602 struct cl_io *io = ios->cis_io;
603 struct vvp_io *vio = cl2vvp_io(env, ios);
605 * XXX LDLM_FL_CBPENDING
607 return vvp_io_one_lock_index(env,
609 vvp_mode_from_vma(vio->u.fault.ft_vma),
610 io->u.ci_fault.ft_index,
611 io->u.ci_fault.ft_index);
614 static int vvp_io_write_lock(const struct lu_env *env,
615 const struct cl_io_slice *ios)
617 struct cl_io *io = ios->cis_io;
621 if (io->u.ci_wr.wr_append) {
623 end = OBD_OBJECT_EOF;
625 start = io->u.ci_wr.wr.crw_pos;
626 end = start + io->u.ci_wr.wr.crw_count - 1;
629 RETURN(vvp_io_rw_lock(env, io, CLM_WRITE, start, end));
632 static int vvp_io_setattr_iter_init(const struct lu_env *env,
633 const struct cl_io_slice *ios)
640 * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
642 * Handles "lockless io" mode when extent locking is done by server.
644 static int vvp_io_setattr_lock(const struct lu_env *env,
645 const struct cl_io_slice *ios)
647 struct cl_io *io = ios->cis_io;
648 __u64 lock_start = 0;
649 __u64 lock_end = OBD_OBJECT_EOF;
652 if (cl_io_is_trunc(io)) {
653 struct inode *inode = vvp_object_inode(io->ci_obj);
655 /* set enqueue flags to CEF_MUST in case of encrypted file,
656 * to prevent lockless truncate
658 if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
660 else if (io->u.ci_setattr.sa_attr.lvb_size == 0)
661 enqflags = CEF_DISCARD_DATA;
662 } else if (cl_io_is_fallocate(io)) {
663 lock_start = io->u.ci_setattr.sa_falloc_offset;
664 lock_end = lock_start + io->u.ci_setattr.sa_attr.lvb_size;
666 unsigned int valid = io->u.ci_setattr.sa_avalid;
668 if (!(valid & TIMES_SET_FLAGS))
671 if ((!(valid & ATTR_MTIME) ||
672 io->u.ci_setattr.sa_attr.lvb_mtime >=
673 io->u.ci_setattr.sa_attr.lvb_ctime) &&
674 (!(valid & ATTR_ATIME) ||
675 io->u.ci_setattr.sa_attr.lvb_atime >=
676 io->u.ci_setattr.sa_attr.lvb_ctime))
680 return vvp_io_one_lock(env, io, enqflags, CLM_WRITE,
681 lock_start, lock_end);
684 static int vvp_do_vmtruncate(struct inode *inode, size_t size)
689 * Only ll_inode_size_lock is taken at this level.
691 ll_inode_size_lock(inode);
692 result = inode_newsize_ok(inode, size);
694 ll_inode_size_unlock(inode);
697 i_size_write(inode, size);
699 ll_truncate_pagecache(inode, size);
700 ll_inode_size_unlock(inode);
704 static int vvp_io_setattr_time(const struct lu_env *env,
705 const struct cl_io_slice *ios)
707 struct cl_io *io = ios->cis_io;
708 struct cl_object *obj = io->ci_obj;
709 struct cl_attr *attr = vvp_env_thread_attr(env);
711 unsigned valid = CAT_CTIME;
713 cl_object_attr_lock(obj);
714 attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
715 if (io->u.ci_setattr.sa_avalid & ATTR_ATIME_SET) {
716 attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
719 if (io->u.ci_setattr.sa_avalid & ATTR_MTIME_SET) {
720 attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
723 result = cl_object_attr_update(env, obj, attr, valid);
724 cl_object_attr_unlock(obj);
729 static int vvp_io_setattr_start(const struct lu_env *env,
730 const struct cl_io_slice *ios)
732 struct cl_io *io = ios->cis_io;
733 struct inode *inode = vvp_object_inode(io->ci_obj);
734 struct ll_inode_info *lli = ll_i2info(inode);
736 if (cl_io_is_trunc(io)) {
737 trunc_sem_down_write(&lli->lli_trunc_sem);
738 mutex_lock(&lli->lli_setattr_mutex);
739 inode_dio_wait(inode);
740 } else if (cl_io_is_fallocate(io)) {
742 inode_dio_wait(inode);
744 mutex_lock(&lli->lli_setattr_mutex);
747 if (io->u.ci_setattr.sa_avalid & TIMES_SET_FLAGS)
748 return vvp_io_setattr_time(env, ios);
753 static void vvp_io_setattr_end(const struct lu_env *env,
754 const struct cl_io_slice *ios)
756 struct cl_io *io = ios->cis_io;
757 struct inode *inode = vvp_object_inode(io->ci_obj);
758 struct ll_inode_info *lli = ll_i2info(inode);
760 if (cl_io_is_trunc(io)) {
761 /* Truncate in memory pages - they must be clean pages
762 * because osc has already notified to destroy osc_extents. */
763 vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
764 mutex_unlock(&lli->lli_setattr_mutex);
765 trunc_sem_up_write(&lli->lli_trunc_sem);
766 } else if (cl_io_is_fallocate(io)) {
769 mutex_unlock(&lli->lli_setattr_mutex);
773 static void vvp_io_setattr_fini(const struct lu_env *env,
774 const struct cl_io_slice *ios)
776 bool restore_needed = ios->cis_io->ci_restore_needed;
777 struct inode *inode = vvp_object_inode(ios->cis_obj);
779 vvp_io_fini(env, ios);
781 if (restore_needed && !ios->cis_io->ci_restore_needed) {
782 /* restore finished, set data modified flag for HSM */
783 ll_file_set_flag(ll_i2info(inode), LLIF_DATA_MODIFIED);
787 static int vvp_io_read_start(const struct lu_env *env,
788 const struct cl_io_slice *ios)
790 struct vvp_io *vio = cl2vvp_io(env, ios);
791 struct cl_io *io = ios->cis_io;
792 struct cl_object *obj = io->ci_obj;
793 struct inode *inode = vvp_object_inode(obj);
794 struct ll_inode_info *lli = ll_i2info(inode);
795 struct file *file = vio->vui_fd->fd_file;
796 loff_t pos = io->u.ci_rd.rd.crw_pos;
797 size_t cnt = io->u.ci_rd.rd.crw_count;
798 size_t tot = vio->vui_tot_count;
801 struct iov_iter iter;
805 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
807 CDEBUG(D_VFSTRACE, "%s: read [%llu, %llu)\n",
808 file_dentry(file)->d_name.name,
811 trunc_sem_down_read(&lli->lli_trunc_sem);
813 if (io->ci_async_readahead) {
818 if (!can_populate_pages(env, io, inode))
821 /* Unless this is reading a sparse file, otherwise the lock has already
822 * been acquired so vvp_prep_size() is an empty op. */
823 result = vvp_prep_size(env, obj, io, pos, cnt, &exceed);
826 else if (exceed != 0)
829 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
830 "Read ino %lu, %zu bytes, offset %lld, size %llu\n",
831 inode->i_ino, cnt, pos, i_size_read(inode));
833 /* turn off the kernel's read-ahead */
834 vio->vui_fd->fd_file->f_ra.ra_pages = 0;
836 /* initialize read-ahead window once per syscall */
837 if (!vio->vui_ra_valid) {
838 vio->vui_ra_valid = true;
839 vio->vui_ra_start_idx = cl_index(obj, pos);
840 vio->vui_ra_pages = cl_index(obj, tot + PAGE_SIZE - 1);
841 /* If both start and end are unaligned, we read one more page
842 * than the index math suggests. */
843 if ((pos & ~PAGE_MASK) != 0 && ((pos + tot) & ~PAGE_MASK) != 0)
846 CDEBUG(D_READA, "tot %zu, ra_start %lu, ra_count %lu\n",
847 tot, vio->vui_ra_start_idx, vio->vui_ra_pages);
852 LASSERT(vio->vui_iocb->ki_pos == pos);
853 iter = *vio->vui_iter;
854 result = generic_file_read_iter(vio->vui_iocb, &iter);
859 io->ci_nob += result;
861 } else if (result == -EIOCBQUEUED) {
862 io->ci_nob += vio->u.readwrite.vui_read;
863 vio->vui_iocb->ki_pos = pos + vio->u.readwrite.vui_read;
869 static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io,
870 struct cl_page_list *plist, int from, int to)
872 struct cl_2queue *queue = &io->ci_queue;
873 struct cl_page *page;
874 unsigned int bytes = 0;
878 if (plist->pl_nr == 0)
881 if (from > 0 || to != PAGE_SIZE) {
882 page = cl_page_list_first(plist);
883 if (plist->pl_nr == 1) {
884 cl_page_clip(env, page, from, to);
887 cl_page_clip(env, page, from, PAGE_SIZE);
888 if (to != PAGE_SIZE) {
889 page = cl_page_list_last(plist);
890 cl_page_clip(env, page, 0, to);
895 cl_2queue_init(queue);
896 cl_page_list_splice(plist, &queue->c2_qin);
897 rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0);
899 /* plist is not sorted any more */
900 cl_page_list_splice(&queue->c2_qin, plist);
901 cl_page_list_splice(&queue->c2_qout, plist);
902 cl_2queue_fini(env, queue);
905 /* calculate bytes */
906 bytes = plist->pl_nr << PAGE_SHIFT;
907 bytes -= from + PAGE_SIZE - to;
909 while (plist->pl_nr > 0) {
910 page = cl_page_list_first(plist);
911 cl_page_list_del(env, plist, page);
913 cl_page_clip(env, page, 0, PAGE_SIZE);
915 SetPageUptodate(cl_page_vmpage(page));
916 cl_page_disown(env, io, page);
918 /* held in ll_cl_init() */
919 lu_ref_del(&page->cp_reference, "cl_io", io);
920 cl_page_put(env, page);
924 RETURN(bytes > 0 ? bytes : rc);
928 * Kernels 4.2 - 4.5 pass memcg argument to account_page_dirtied()
929 * Kernel v5.2-5678-gac1c3e4 no longer exports account_page_dirtied
931 static inline void ll_account_page_dirtied(struct page *page,
932 struct address_space *mapping)
934 #ifdef HAVE_ACCOUNT_PAGE_DIRTIED_3ARGS
935 struct mem_cgroup *memcg = mem_cgroup_begin_page_stat(page);
937 account_page_dirtied(page, mapping, memcg);
938 mem_cgroup_end_page_stat(memcg);
939 #elif defined(HAVE_ACCOUNT_PAGE_DIRTIED_EXPORT)
940 account_page_dirtied(page, mapping);
942 vvp_account_page_dirtied(page, mapping);
947 * From kernel v4.19-rc5-248-g9b89a0355144 use XArrary
948 * Prior kernels use radix_tree for tags
950 static inline void ll_page_tag_dirty(struct page *page,
951 struct address_space *mapping)
953 #ifndef HAVE_RADIX_TREE_TAG_SET
954 __xa_set_mark(&mapping->i_pages, page_index(page), PAGECACHE_TAG_DIRTY);
956 radix_tree_tag_set(&mapping->page_tree, page_index(page),
957 PAGECACHE_TAG_DIRTY);
961 /* Taken from kernel set_page_dirty, __set_page_dirty_nobuffers
962 * Last change to this area: b93b016313b3ba8003c3b8bb71f569af91f19fc7
964 * Current with Linus tip of tree (7/13/2019):
965 * v5.2-rc4-224-ge01e060fe0
967 * Backwards compat for 3.x, 5.x kernels relating to memcg handling
968 * & rename of radix tree to xarray.
970 void vvp_set_pagevec_dirty(struct pagevec *pvec)
972 struct page *page = pvec->pages[0];
973 struct address_space *mapping = page->mapping;
975 unsigned long skip_pages = 0;
976 int count = pagevec_count(pvec);
982 BUILD_BUG_ON(PAGEVEC_SIZE > BITS_PER_LONG);
983 LASSERTF(page->mapping,
984 "mapping must be set. page %p, page->private (cl_page) %p\n",
985 page, (void *) page->private);
987 for (i = 0; i < count; i++) {
988 page = pvec->pages[i];
990 ClearPageReclaim(page);
992 lock_page_memcg(page);
993 if (TestSetPageDirty(page)) {
994 /* page is already dirty .. no extra work needed
995 * set a flag for the i'th page to be skipped
997 unlock_page_memcg(page);
998 skip_pages |= (1 << i);
1002 ll_xa_lock_irqsave(&mapping->i_pages, flags);
1004 /* Notes on differences with __set_page_dirty_nobuffers:
1005 * 1. We don't need to call page_mapping because we know this is a page
1007 * 2. We have the pages locked, so there is no need for the careful
1008 * mapping/mapping2 dance.
1009 * 3. No mapping is impossible. (Race w/truncate mentioned in
1010 * dirty_nobuffers should be impossible because we hold the page lock.)
1011 * 4. All mappings are the same because i/o is only to one file.
1013 for (i = 0; i < count; i++) {
1014 page = pvec->pages[i];
1015 /* if the i'th page was unlocked above, skip it here */
1016 if ((skip_pages >> i) & 1)
1019 LASSERTF(page->mapping == mapping,
1020 "all pages must have the same mapping. page %p, mapping %p, first mapping %p\n",
1021 page, page->mapping, mapping);
1022 WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
1023 ll_account_page_dirtied(page, mapping);
1024 ll_page_tag_dirty(page, mapping);
1026 unlock_page_memcg(page);
1028 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1030 CDEBUG(D_VFSTRACE, "mapping %p, count %d, dirtied %d\n", mapping,
1033 if (mapping->host && dirtied) {
1034 /* !PageAnon && !swapper_space */
1035 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
1041 static void write_commit_callback(const struct lu_env *env, struct cl_io *io,
1042 struct pagevec *pvec)
1049 count = pagevec_count(pvec);
1052 for (i = 0; i < count; i++) {
1053 struct page *vmpage = pvec->pages[i];
1054 SetPageUptodate(vmpage);
1057 vvp_set_pagevec_dirty(pvec);
1059 for (i = 0; i < count; i++) {
1060 struct page *vmpage = pvec->pages[i];
1061 struct cl_page *page = (struct cl_page *) vmpage->private;
1062 cl_page_disown(env, io, page);
1063 lu_ref_del(&page->cp_reference, "cl_io", cl_io_top(io));
1064 cl_page_put(env, page);
1070 /* make sure the page list is contiguous */
1071 static bool page_list_sanity_check(struct cl_object *obj,
1072 struct cl_page_list *plist)
1074 struct cl_page *page;
1075 pgoff_t index = CL_PAGE_EOF;
1077 cl_page_list_for_each(page, plist) {
1078 struct vvp_page *vpg = cl_object_page_slice(obj, page);
1080 if (index == CL_PAGE_EOF) {
1081 index = vvp_index(vpg);
1086 if (index == vvp_index(vpg))
1094 /* Return how many bytes have queued or written */
1095 int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io)
1097 struct cl_object *obj = io->ci_obj;
1098 struct inode *inode = vvp_object_inode(obj);
1099 struct vvp_io *vio = vvp_env_io(env);
1100 struct cl_page_list *queue = &vio->u.readwrite.vui_queue;
1101 struct cl_page *page;
1104 unsigned int npages = vio->u.readwrite.vui_queue.pl_nr;
1110 CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n",
1111 npages, vio->u.readwrite.vui_from, vio->u.readwrite.vui_to);
1113 LASSERT(page_list_sanity_check(obj, queue));
1115 /* submit IO with async write */
1116 rc = cl_io_commit_async(env, io, queue,
1117 vio->u.readwrite.vui_from,
1118 vio->u.readwrite.vui_to,
1119 write_commit_callback);
1120 npages -= queue->pl_nr; /* already committed pages */
1122 /* calculate how many bytes were written */
1123 bytes = npages << PAGE_SHIFT;
1126 bytes -= vio->u.readwrite.vui_from;
1127 if (queue->pl_nr == 0) /* last page */
1128 bytes -= PAGE_SIZE - vio->u.readwrite.vui_to;
1129 LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
1131 vio->u.readwrite.vui_written += bytes;
1133 CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
1134 npages, bytes, vio->u.readwrite.vui_written);
1136 /* the first page must have been written. */
1137 vio->u.readwrite.vui_from = 0;
1139 LASSERT(page_list_sanity_check(obj, queue));
1140 LASSERT(ergo(rc == 0, queue->pl_nr == 0));
1142 /* out of quota, try sync write */
1143 if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) {
1144 rc = vvp_io_commit_sync(env, io, queue,
1145 vio->u.readwrite.vui_from,
1146 vio->u.readwrite.vui_to);
1148 vio->u.readwrite.vui_written += rc;
1153 /* update inode size */
1154 ll_merge_attr(env, inode);
1156 /* Now the pages in queue were failed to commit, discard them
1157 * unless they were dirtied before. */
1158 while (queue->pl_nr > 0) {
1159 page = cl_page_list_first(queue);
1160 cl_page_list_del(env, queue, page);
1162 if (!PageDirty(cl_page_vmpage(page)))
1163 cl_page_discard(env, io, page);
1165 cl_page_disown(env, io, page);
1167 /* held in ll_cl_init() */
1168 lu_ref_del(&page->cp_reference, "cl_io", io);
1169 cl_page_put(env, page);
1171 cl_page_list_fini(env, queue);
1176 static int vvp_io_write_start(const struct lu_env *env,
1177 const struct cl_io_slice *ios)
1179 struct vvp_io *vio = cl2vvp_io(env, ios);
1180 struct cl_io *io = ios->cis_io;
1181 struct cl_object *obj = io->ci_obj;
1182 struct inode *inode = vvp_object_inode(obj);
1183 struct ll_inode_info *lli = ll_i2info(inode);
1184 struct file *file = vio->vui_fd->fd_file;
1186 loff_t pos = io->u.ci_wr.wr.crw_pos;
1187 size_t cnt = io->u.ci_wr.wr.crw_count;
1188 bool lock_inode = !IS_NOSEC(inode);
1189 size_t nob = io->ci_nob;
1190 struct iov_iter iter;
1195 trunc_sem_down_read(&lli->lli_trunc_sem);
1197 if (!can_populate_pages(env, io, inode))
1200 if (cl_io_is_append(io)) {
1202 * PARALLEL IO This has to be changed for parallel IO doing
1203 * out-of-order writes.
1205 ll_merge_attr(env, inode);
1206 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
1207 vio->vui_iocb->ki_pos = pos;
1209 LASSERTF(vio->vui_iocb->ki_pos == pos,
1210 "ki_pos %lld [%lld, %lld)\n",
1211 vio->vui_iocb->ki_pos,
1215 CDEBUG(D_VFSTRACE, "%s: write [%llu, %llu)\n",
1216 file_dentry(file)->d_name.name,
1219 /* The maximum Lustre file size is variable, based on the OST maximum
1220 * object size and number of stripes. This needs another check in
1221 * addition to the VFS checks earlier. */
1222 if (pos + cnt > ll_file_maxbytes(inode)) {
1224 "%s: file %s ("DFID") offset %llu > maxbytes %llu\n",
1225 ll_i2sbi(inode)->ll_fsname,
1226 file_dentry(file)->d_name.name,
1227 PFID(ll_inode2fid(inode)), pos + cnt,
1228 ll_file_maxbytes(inode));
1232 /* Tests to verify we take the i_mutex correctly */
1233 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_SEC) && !lock_inode)
1236 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_IMUTEX_NOSEC) && lock_inode)
1239 if (vio->vui_iter == NULL) {
1240 /* from a temp io in ll_cl_init(). */
1244 * When using the locked AIO function (generic_file_aio_write())
1245 * testing has shown the inode mutex to be a limiting factor
1246 * with multi-threaded single shared file performance. To get
1247 * around this, we now use the lockless version. To maintain
1248 * consistency, proper locking to protect against writes,
1249 * trucates, etc. is handled in the higher layers of lustre.
1251 lock_inode = !IS_NOSEC(inode);
1252 iter = *vio->vui_iter;
1254 if (unlikely(lock_inode))
1256 result = __generic_file_write_iter(vio->vui_iocb, &iter);
1257 if (unlikely(lock_inode))
1258 inode_unlock(inode);
1262 #ifdef HAVE_GENERIC_WRITE_SYNC_2ARGS
1263 result = generic_write_sync(vio->vui_iocb, result);
1268 err = generic_write_sync(vio->vui_iocb->ki_filp, pos,
1270 if (err < 0 && result > 0)
1277 result = vvp_io_write_commit(env, io);
1278 /* Simulate short commit */
1279 if (CFS_FAULT_CHECK(OBD_FAIL_LLITE_SHORT_COMMIT)) {
1280 vio->u.readwrite.vui_written >>= 1;
1281 if (vio->u.readwrite.vui_written > 0)
1282 io->ci_need_restart = 1;
1284 if (vio->u.readwrite.vui_written > 0) {
1285 result = vio->u.readwrite.vui_written;
1286 CDEBUG(D_VFSTRACE, "%s: write nob %zd, result: %zd\n",
1287 file_dentry(file)->d_name.name,
1288 io->ci_nob, result);
1289 io->ci_nob += result;
1291 io->ci_continue = 0;
1294 if (vio->vui_iocb->ki_pos != (pos + io->ci_nob - nob)) {
1296 "%s: write position mismatch: ki_pos %lld vs. pos %lld, written %zd, commit %zd: rc = %zd\n",
1297 file_dentry(file)->d_name.name,
1298 vio->vui_iocb->ki_pos, pos + io->ci_nob - nob,
1299 written, io->ci_nob - nob, result);
1301 * Rewind ki_pos and vui_iter to where it has
1302 * successfully committed.
1304 vio->vui_iocb->ki_pos = pos + io->ci_nob - nob;
1306 if (result > 0 || result == -EIOCBQUEUED) {
1307 ll_file_set_flag(ll_i2info(inode), LLIF_DATA_MODIFIED);
1309 if (result != -EIOCBQUEUED && result < cnt)
1310 io->ci_continue = 0;
1314 if (result == -EIOCBQUEUED) {
1315 io->ci_nob += vio->u.readwrite.vui_written;
1316 vio->vui_iocb->ki_pos = pos +
1317 vio->u.readwrite.vui_written;
1324 static void vvp_io_rw_end(const struct lu_env *env,
1325 const struct cl_io_slice *ios)
1327 struct inode *inode = vvp_object_inode(ios->cis_obj);
1328 struct ll_inode_info *lli = ll_i2info(inode);
1330 trunc_sem_up_read(&lli->lli_trunc_sem);
1333 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
1335 struct vm_fault *vmf = cfio->ft_vmf;
1337 cfio->ft_flags = ll_filemap_fault(cfio->ft_vma, vmf);
1338 cfio->ft_flags_valid = 1;
1341 LL_CDEBUG_PAGE(D_PAGE, vmf->page, "got addr %p type NOPAGE\n",
1342 get_vmf_address(vmf));
1343 if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) {
1344 lock_page(vmf->page);
1345 cfio->ft_flags |= VM_FAULT_LOCKED;
1348 cfio->ft_vmpage = vmf->page;
1353 if (cfio->ft_flags & VM_FAULT_SIGBUS) {
1354 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", get_vmf_address(vmf));
1358 if (cfio->ft_flags & VM_FAULT_OOM) {
1359 CDEBUG(D_PAGE, "got addr %p - OOM\n", get_vmf_address(vmf));
1363 if (cfio->ft_flags & VM_FAULT_RETRY)
1366 CERROR("unknown error in page fault %d\n", cfio->ft_flags);
1371 static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io,
1372 struct pagevec *pvec)
1374 vvp_set_pagevec_dirty(pvec);
1377 static int vvp_io_fault_start(const struct lu_env *env,
1378 const struct cl_io_slice *ios)
1380 struct vvp_io *vio = cl2vvp_io(env, ios);
1381 struct cl_io *io = ios->cis_io;
1382 struct cl_object *obj = io->ci_obj;
1383 struct inode *inode = vvp_object_inode(obj);
1384 struct ll_inode_info *lli = ll_i2info(inode);
1385 struct cl_fault_io *fio = &io->u.ci_fault;
1386 struct vvp_fault_io *cfio = &vio->u.fault;
1389 struct page *vmpage = NULL;
1390 struct cl_page *page;
1395 trunc_sem_down_read_nowait(&lli->lli_trunc_sem);
1397 /* offset of the last byte on the page */
1398 offset = cl_offset(obj, fio->ft_index + 1) - 1;
1399 LASSERT(cl_index(obj, offset) == fio->ft_index);
1400 result = vvp_prep_size(env, obj, io, 0, offset + 1, NULL);
1404 /* must return locked page */
1405 if (fio->ft_mkwrite) {
1406 LASSERT(cfio->ft_vmpage != NULL);
1407 lock_page(cfio->ft_vmpage);
1409 result = vvp_io_kernel_fault(cfio);
1414 vmpage = cfio->ft_vmpage;
1415 LASSERT(PageLocked(vmpage));
1417 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
1418 generic_error_remove_page(vmpage->mapping, vmpage);
1420 size = i_size_read(inode);
1421 /* Though we have already held a cl_lock upon this page, but
1422 * it still can be truncated locally. */
1423 if (unlikely((vmpage->mapping != inode->i_mapping) ||
1424 (page_offset(vmpage) > size))) {
1425 CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
1427 /* return +1 to stop cl_io_loop() and ll_fault() will catch
1429 GOTO(out, result = +1);
1432 last_index = cl_index(obj, size - 1);
1434 if (fio->ft_mkwrite ) {
1436 * Capture the size while holding the lli_trunc_sem from above
1437 * we want to make sure that we complete the mkwrite action
1438 * while holding this lock. We need to make sure that we are
1439 * not past the end of the file.
1441 if (last_index < fio->ft_index) {
1443 "llite: mkwrite and truncate race happened: "
1444 "%p: 0x%lx 0x%lx\n",
1445 vmpage->mapping,fio->ft_index,last_index);
1447 * We need to return if we are
1448 * passed the end of the file. This will propagate
1449 * up the call stack to ll_page_mkwrite where
1450 * we will return VM_FAULT_NOPAGE. Any non-negative
1451 * value returned here will be silently
1452 * converted to 0. If the vmpage->mapping is null
1453 * the error code would be converted back to ENODATA
1454 * in ll_page_mkwrite0. Thus we return -ENODATA
1455 * to handle both cases
1457 GOTO(out, result = -ENODATA);
1461 page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
1463 GOTO(out, result = PTR_ERR(page));
1465 /* if page is going to be written, we should add this page into cache
1467 if (fio->ft_mkwrite) {
1468 wait_on_page_writeback(vmpage);
1469 if (!PageDirty(vmpage)) {
1470 struct cl_page_list *plist = &vio->u.fault.ft_queue;
1471 struct vvp_page *vpg = cl_object_page_slice(obj, page);
1474 /* vvp_page_assume() calls wait_on_page_writeback(). */
1475 cl_page_assume(env, io, page);
1477 cl_page_list_init(plist);
1478 cl_page_list_add(plist, page);
1481 if (last_index == vvp_index(vpg))
1482 to = ((size - 1) & ~PAGE_MASK) + 1;
1484 /* Do not set Dirty bit here so that in case IO is
1485 * started before the page is really made dirty, we
1486 * still have chance to detect it. */
1487 result = cl_io_commit_async(env, io, plist, 0, to,
1488 mkwrite_commit_callback);
1489 /* Have overquota flag, trying sync write to check
1490 * whether indeed out of quota */
1491 if (result == -EDQUOT) {
1493 result = vvp_io_commit_sync(env, io,
1497 cl_page_own(env, io, page);
1498 cl_page_list_add(plist, page);
1499 lu_ref_add(&page->cp_reference,
1501 result = cl_io_commit_async(env, io,
1503 mkwrite_commit_callback);
1506 cl_page_put(env, page);
1510 LASSERT(cl_page_is_owned(page, io));
1511 cl_page_list_fini(env, plist);
1515 cl_page_discard(env, io, page);
1516 cl_page_disown(env, io, page);
1518 cl_page_put(env, page);
1520 /* we're in big trouble, what can we do now? */
1521 if (result == -EDQUOT)
1525 cl_page_disown(env, io, page);
1531 * The ft_index is only used in the case of
1532 * a mkwrite action. We need to check
1533 * our assertions are correct, since
1534 * we should have caught this above
1536 LASSERT(!fio->ft_mkwrite || fio->ft_index <= last_index);
1537 if (fio->ft_index == last_index)
1539 * Last page is mapped partially.
1541 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
1543 fio->ft_nob = cl_page_size(obj);
1545 lu_ref_add(&page->cp_reference, "fault", io);
1546 fio->ft_page = page;
1550 /* return unlocked vmpage to avoid deadlocking */
1552 unlock_page(vmpage);
1554 cfio->ft_flags &= ~VM_FAULT_LOCKED;
1559 static void vvp_io_fault_end(const struct lu_env *env,
1560 const struct cl_io_slice *ios)
1562 struct inode *inode = vvp_object_inode(ios->cis_obj);
1563 struct ll_inode_info *lli = ll_i2info(inode);
1565 CLOBINVRNT(env, ios->cis_io->ci_obj,
1566 vvp_object_invariant(ios->cis_io->ci_obj));
1567 trunc_sem_up_read(&lli->lli_trunc_sem);
1570 static int vvp_io_fsync_start(const struct lu_env *env,
1571 const struct cl_io_slice *ios)
1573 /* we should mark TOWRITE bit to each dirty page in radix tree to
1574 * verify pages have been written, but this is difficult because of
1579 static int vvp_io_read_ahead(const struct lu_env *env,
1580 const struct cl_io_slice *ios,
1581 pgoff_t start, struct cl_read_ahead *ra)
1586 if (ios->cis_io->ci_type == CIT_READ ||
1587 ios->cis_io->ci_type == CIT_FAULT) {
1588 struct vvp_io *vio = cl2vvp_io(env, ios);
1590 if (unlikely(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
1591 ra->cra_end_idx = CL_PAGE_EOF;
1592 result = +1; /* no need to call down */
1599 static int vvp_io_lseek_lock(const struct lu_env *env,
1600 const struct cl_io_slice *ios)
1602 struct cl_io *io = ios->cis_io;
1603 __u64 lock_start = io->u.ci_lseek.ls_start;
1604 __u64 lock_end = OBD_OBJECT_EOF;
1605 __u32 enqflags = CEF_MUST; /* always take client lock */
1607 return vvp_io_one_lock(env, io, enqflags, CLM_READ,
1608 lock_start, lock_end);
1611 static int vvp_io_lseek_start(const struct lu_env *env,
1612 const struct cl_io_slice *ios)
1614 struct cl_io *io = ios->cis_io;
1615 struct inode *inode = vvp_object_inode(io->ci_obj);
1616 __u64 start = io->u.ci_lseek.ls_start;
1619 inode_dio_wait(inode);
1621 /* At the moment we have DLM lock so just update inode
1622 * to know the file size.
1624 ll_merge_attr(env, inode);
1625 if (start >= i_size_read(inode)) {
1626 io->u.ci_lseek.ls_result = -ENXIO;
1632 static void vvp_io_lseek_end(const struct lu_env *env,
1633 const struct cl_io_slice *ios)
1635 struct cl_io *io = ios->cis_io;
1636 struct inode *inode = vvp_object_inode(io->ci_obj);
1638 if (io->u.ci_lseek.ls_result > i_size_read(inode))
1639 io->u.ci_lseek.ls_result = -ENXIO;
1641 inode_unlock(inode);
1644 static const struct cl_io_operations vvp_io_ops = {
1647 .cio_fini = vvp_io_fini,
1648 .cio_iter_init = vvp_io_read_iter_init,
1649 .cio_lock = vvp_io_read_lock,
1650 .cio_start = vvp_io_read_start,
1651 .cio_end = vvp_io_rw_end,
1652 .cio_advance = vvp_io_advance,
1655 .cio_fini = vvp_io_fini,
1656 .cio_iter_init = vvp_io_write_iter_init,
1657 .cio_iter_fini = vvp_io_write_iter_fini,
1658 .cio_lock = vvp_io_write_lock,
1659 .cio_start = vvp_io_write_start,
1660 .cio_end = vvp_io_rw_end,
1661 .cio_advance = vvp_io_advance,
1664 .cio_fini = vvp_io_setattr_fini,
1665 .cio_iter_init = vvp_io_setattr_iter_init,
1666 .cio_lock = vvp_io_setattr_lock,
1667 .cio_start = vvp_io_setattr_start,
1668 .cio_end = vvp_io_setattr_end
1671 .cio_fini = vvp_io_fault_fini,
1672 .cio_iter_init = vvp_io_fault_iter_init,
1673 .cio_lock = vvp_io_fault_lock,
1674 .cio_start = vvp_io_fault_start,
1675 .cio_end = vvp_io_fault_end,
1678 .cio_start = vvp_io_fsync_start,
1679 .cio_fini = vvp_io_fini
1682 .cio_fini = vvp_io_fini
1685 .cio_fini = vvp_io_fini
1688 .cio_fini = vvp_io_fini
1691 .cio_fini = vvp_io_fini,
1692 .cio_lock = vvp_io_lseek_lock,
1693 .cio_start = vvp_io_lseek_start,
1694 .cio_end = vvp_io_lseek_end,
1697 .cio_read_ahead = vvp_io_read_ahead
1700 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
1703 struct vvp_io *vio = vvp_env_io(env);
1704 struct inode *inode = vvp_object_inode(obj);
1707 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
1710 CDEBUG(D_VFSTRACE, DFID" ignore/verify layout %d/%d, layout version %d "
1711 "restore needed %d\n",
1712 PFID(lu_object_fid(&obj->co_lu)),
1713 io->ci_ignore_layout, io->ci_verify_layout,
1714 vio->vui_layout_gen, io->ci_restore_needed);
1716 CL_IO_SLICE_CLEAN(vio, vui_cl);
1717 cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops);
1718 vio->vui_ra_valid = false;
1720 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
1722 struct ll_inode_info *lli = ll_i2info(inode);
1724 count = io->u.ci_rw.crw_count;
1725 /* "If nbyte is 0, read() will return 0 and have no other
1726 * results." -- Single Unix Spec */
1730 vio->vui_tot_count = count;
1732 /* for read/write, we store the jobid in the inode, and
1733 * it'll be fetched by osc when building RPC.
1735 * it's not accurate if the file is shared by different
1738 lustre_get_jobid(lli->lli_jobid, sizeof(lli->lli_jobid));
1739 } else if (io->ci_type == CIT_SETATTR) {
1740 if (!cl_io_is_trunc(io))
1741 io->ci_lockreq = CILR_MANDATORY;
1744 /* Enqueue layout lock and get layout version. We need to do this
1745 * even for operations requiring to open file, such as read and write,
1746 * because it might not grant layout lock in IT_OPEN. */
1747 if (result == 0 && !io->ci_ignore_layout) {
1748 result = ll_layout_refresh(inode, &vio->vui_layout_gen);
1749 if (result == -ENOENT)
1750 /* If the inode on MDS has been removed, but the objects
1751 * on OSTs haven't been destroyed (async unlink), layout
1752 * fetch will return -ENOENT, we'd ingore this error
1753 * and continue with dirty flush. LU-3230. */
1756 CERROR("%s: refresh file layout " DFID " error %d.\n",
1757 ll_i2sbi(inode)->ll_fsname,
1758 PFID(lu_object_fid(&obj->co_lu)), result);
1761 io->ci_result = result < 0 ? result : 0;