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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_io for VVP layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_LLITE
46 #include "llite_internal.h"
47 #include "vvp_internal.h"
49 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
50 const struct cl_io_slice *slice)
54 vio = container_of(slice, struct vvp_io, vui_cl);
55 LASSERT(vio == vvp_env_io(env));
61 * True, if \a io is a normal io, False for splice_{read,write}
63 static int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
65 struct vvp_io *vio = vvp_env_io(env);
67 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
69 return vio->vui_io_subtype == IO_NORMAL;
73 * For swapping layout. The file's layout may have changed.
74 * To avoid populating pages to a wrong stripe, we have to verify the
75 * correctness of layout. It works because swapping layout processes
76 * have to acquire group lock.
78 static bool can_populate_pages(const struct lu_env *env, struct cl_io *io,
81 struct ll_inode_info *lli = ll_i2info(inode);
82 struct vvp_io *vio = vvp_env_io(env);
85 switch (io->ci_type) {
88 /* don't need lock here to check lli_layout_gen as we have held
89 * extent lock and GROUP lock has to hold to swap layout */
90 if (ll_layout_version_get(lli) != vio->vui_layout_gen ||
91 OBD_FAIL_CHECK_RESET(OBD_FAIL_LLITE_LOST_LAYOUT, 0)) {
92 io->ci_need_restart = 1;
93 /* this will cause a short read/write */
98 /* fault is okay because we've already had a page. */
106 static void vvp_object_size_lock(struct cl_object *obj)
108 struct inode *inode = vvp_object_inode(obj);
110 ll_inode_size_lock(inode);
111 cl_object_attr_lock(obj);
114 static void vvp_object_size_unlock(struct cl_object *obj)
116 struct inode *inode = vvp_object_inode(obj);
118 cl_object_attr_unlock(obj);
119 ll_inode_size_unlock(inode);
123 * Helper function that if necessary adjusts file size (inode->i_size), when
124 * position at the offset \a pos is accessed. File size can be arbitrary stale
125 * on a Lustre client, but client at least knows KMS. If accessed area is
126 * inside [0, KMS], set file size to KMS, otherwise glimpse file size.
128 * Locking: i_size_lock is used to serialize changes to inode size and to
129 * protect consistency between inode size and cl_object
130 * attributes. cl_object_size_lock() protects consistency between cl_attr's of
131 * top-object and sub-objects.
133 static int vvp_prep_size(const struct lu_env *env, struct cl_object *obj,
134 struct cl_io *io, loff_t start, size_t count,
137 struct cl_attr *attr = vvp_env_thread_attr(env);
138 struct inode *inode = vvp_object_inode(obj);
139 loff_t pos = start + count - 1;
144 * Consistency guarantees: following possibilities exist for the
145 * relation between region being accessed and real file size at this
148 * (A): the region is completely inside of the file;
150 * (B-x): x bytes of region are inside of the file, the rest is
153 * (C): the region is completely outside of the file.
155 * This classification is stable under DLM lock already acquired by
156 * the caller, because to change the class, other client has to take
157 * DLM lock conflicting with our lock. Also, any updates to ->i_size
158 * by other threads on this client are serialized by
159 * ll_inode_size_lock(). This guarantees that short reads are handled
160 * correctly in the face of concurrent writes and truncates.
162 vvp_object_size_lock(obj);
163 result = cl_object_attr_get(env, obj, attr);
168 * A glimpse is necessary to determine whether we
169 * return a short read (B) or some zeroes at the end
172 vvp_object_size_unlock(obj);
173 result = cl_glimpse_lock(env, io, inode, obj, 0);
174 if (result == 0 && exceed != NULL) {
175 /* If objective page index exceed end-of-file
176 * page index, return directly. Do not expect
177 * kernel will check such case correctly.
178 * linux-2.6.18-128.1.1 miss to do that.
180 loff_t size = i_size_read(inode);
181 unsigned long cur_index = start >>
184 if ((size == 0 && cur_index != 0) ||
185 (((size - 1) >> PAGE_CACHE_SHIFT) <
193 * region is within kms and, hence, within real file
194 * size (A). We need to increase i_size to cover the
195 * read region so that generic_file_read() will do its
196 * job, but that doesn't mean the kms size is
197 * _correct_, it is only the _minimum_ size. If
198 * someone does a stat they will get the correct size
199 * which will always be >= the kms value here.
202 if (i_size_read(inode) < kms) {
203 i_size_write(inode, kms);
205 DFID" updating i_size "LPU64"\n",
206 PFID(lu_object_fid(&obj->co_lu)),
207 (__u64)i_size_read(inode));
212 vvp_object_size_unlock(obj);
217 /*****************************************************************************
223 static int vvp_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
224 __u32 enqflags, enum cl_lock_mode mode,
225 pgoff_t start, pgoff_t end)
227 struct vvp_io *vio = vvp_env_io(env);
228 struct cl_lock_descr *descr = &vio->vui_link.cill_descr;
229 struct cl_object *obj = io->ci_obj;
231 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
234 CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
236 memset(&vio->vui_link, 0, sizeof vio->vui_link);
238 if (vio->vui_fd && (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
239 descr->cld_mode = CLM_GROUP;
240 descr->cld_gid = vio->vui_fd->fd_grouplock.lg_gid;
242 descr->cld_mode = mode;
245 descr->cld_obj = obj;
246 descr->cld_start = start;
247 descr->cld_end = end;
248 descr->cld_enq_flags = enqflags;
250 cl_io_lock_add(env, io, &vio->vui_link);
255 static int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io,
256 __u32 enqflags, enum cl_lock_mode mode,
257 loff_t start, loff_t end)
259 struct cl_object *obj = io->ci_obj;
261 return vvp_io_one_lock_index(env, io, enqflags, mode,
262 cl_index(obj, start), cl_index(obj, end));
265 static int vvp_io_write_iter_init(const struct lu_env *env,
266 const struct cl_io_slice *ios)
268 struct vvp_io *vio = cl2vvp_io(env, ios);
270 cl_page_list_init(&vio->u.write.vui_queue);
271 vio->u.write.vui_written = 0;
272 vio->u.write.vui_from = 0;
273 vio->u.write.vui_to = PAGE_SIZE;
278 static void vvp_io_write_iter_fini(const struct lu_env *env,
279 const struct cl_io_slice *ios)
281 struct vvp_io *vio = cl2vvp_io(env, ios);
283 LASSERT(vio->u.write.vui_queue.pl_nr == 0);
286 static int vvp_io_fault_iter_init(const struct lu_env *env,
287 const struct cl_io_slice *ios)
289 struct vvp_io *vio = cl2vvp_io(env, ios);
290 struct inode *inode = vvp_object_inode(ios->cis_obj);
292 LASSERT(inode == vio->vui_fd->fd_file->f_dentry->d_inode);
293 vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime);
298 static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
300 struct cl_io *io = ios->cis_io;
301 struct cl_object *obj = io->ci_obj;
302 struct vvp_io *vio = cl2vvp_io(env, ios);
303 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 "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_restore_needed);
313 if (io->ci_restore_needed == 1) {
316 /* file was detected release, we need to restore it
317 * before finishing the io
319 rc = ll_layout_restore(inode, 0, OBD_OBJECT_EOF);
320 /* if restore registration failed, no restart,
321 * we will return -ENODATA */
322 /* The layout will change after restore, so we need to
323 * block on layout lock hold by the MDT
324 * as MDT will not send new layout in lvb (see LU-3124)
325 * we have to explicitly fetch it, all this will be done
326 * by ll_layout_refresh()
329 io->ci_restore_needed = 0;
330 io->ci_need_restart = 1;
331 io->ci_verify_layout = 1;
333 io->ci_restore_needed = 1;
334 io->ci_need_restart = 0;
335 io->ci_verify_layout = 0;
340 if (!io->ci_ignore_layout && io->ci_verify_layout) {
343 /* check layout version */
344 ll_layout_refresh(inode, &gen);
345 io->ci_need_restart = vio->vui_layout_gen != gen;
346 if (io->ci_need_restart) {
348 DFID" layout changed from %d to %d.\n",
349 PFID(lu_object_fid(&obj->co_lu)),
350 vio->vui_layout_gen, gen);
351 /* today successful restore is the only possible
353 /* restore was done, clear restoring state */
354 ll_i2info(vvp_object_inode(obj))->lli_flags &=
355 ~LLIF_FILE_RESTORING;
360 static void vvp_io_fault_fini(const struct lu_env *env,
361 const struct cl_io_slice *ios)
363 struct cl_io *io = ios->cis_io;
364 struct cl_page *page = io->u.ci_fault.ft_page;
366 CLOBINVRNT(env, io->ci_obj, vvp_object_invariant(io->ci_obj));
369 lu_ref_del(&page->cp_reference, "fault", io);
370 cl_page_put(env, page);
371 io->u.ci_fault.ft_page = NULL;
373 vvp_io_fini(env, ios);
376 static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
379 * we only want to hold PW locks if the mmap() can generate
380 * writes back to the file and that only happens in shared
383 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
388 static int vvp_mmap_locks(const struct lu_env *env,
389 struct vvp_io *vio, struct cl_io *io)
391 struct vvp_thread_info *vti = vvp_env_info(env);
392 struct mm_struct *mm = current->mm;
393 struct vm_area_struct *vma;
394 struct cl_lock_descr *descr = &vti->vti_descr;
395 ldlm_policy_data_t policy;
402 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
404 if (!cl_is_normalio(env, io))
407 if (vio->vui_iov == NULL) /* nfs or loop back device write */
410 /* No MM (e.g. NFS)? No vmas too. */
414 for (seg = 0; seg < vio->vui_nrsegs; seg++) {
415 const struct iovec *iv = &vio->vui_iov[seg];
417 addr = (unsigned long)iv->iov_base;
422 count += addr & ~PAGE_MASK;
425 down_read(&mm->mmap_sem);
426 while((vma = our_vma(mm, addr, count)) != NULL) {
427 struct inode *inode = vma->vm_file->f_dentry->d_inode;
428 int flags = CEF_MUST;
430 if (ll_file_nolock(vma->vm_file)) {
432 * For no lock case is not allowed for mmap
439 * XXX: Required lock mode can be weakened: CIT_WRITE
440 * io only ever reads user level buffer, and CIT_READ
443 policy_from_vma(&policy, vma, addr, count);
444 descr->cld_mode = vvp_mode_from_vma(vma);
445 descr->cld_obj = ll_i2info(inode)->lli_clob;
446 descr->cld_start = cl_index(descr->cld_obj,
447 policy.l_extent.start);
448 descr->cld_end = cl_index(descr->cld_obj,
449 policy.l_extent.end);
450 descr->cld_enq_flags = flags;
451 result = cl_io_lock_alloc_add(env, io, descr);
453 CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
454 descr->cld_mode, descr->cld_start,
460 if (vma->vm_end - addr >= count)
463 count -= vma->vm_end - addr;
466 up_read(&mm->mmap_sem);
473 static void vvp_io_advance(const struct lu_env *env,
474 const struct cl_io_slice *ios,
477 struct vvp_io *vio = cl2vvp_io(env, ios);
478 struct cl_io *io = ios->cis_io;
479 struct cl_object *obj = ios->cis_io->ci_obj;
482 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
484 if (!cl_is_normalio(env, io))
487 LASSERT(vio->vui_tot_nrsegs >= vio->vui_nrsegs);
488 LASSERT(vio->vui_tot_count >= nob);
490 /* Restore the iov changed in vvp_io_update_iov() */
491 if (vio->vui_iov_olen > 0) {
492 vio->vui_iov[vio->vui_nrsegs - 1].iov_len = vio->vui_iov_olen;
493 vio->vui_iov_olen = 0;
499 if (iov->iov_len > nob) {
501 iov->iov_base += nob;
507 vio->vui_tot_nrsegs--;
511 vio->vui_tot_count -= nob;
514 static void vvp_io_update_iov(const struct lu_env *env,
515 struct vvp_io *vio, struct cl_io *io)
518 size_t size = io->u.ci_rw.crw_count;
520 vio->vui_iov_olen = 0;
521 if (!cl_is_normalio(env, io) || vio->vui_tot_nrsegs == 0)
524 for (i = 0; i < vio->vui_tot_nrsegs; i++) {
525 struct iovec *iv = &vio->vui_iov[i];
527 if (iv->iov_len < size) {
530 if (iv->iov_len > size) {
531 vio->vui_iov_olen = iv->iov_len;
538 vio->vui_nrsegs = i + 1;
539 LASSERTF(vio->vui_tot_nrsegs >= vio->vui_nrsegs,
540 "tot_nrsegs: %lu, nrsegs: %lu\n",
541 vio->vui_tot_nrsegs, vio->vui_nrsegs);
544 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
545 enum cl_lock_mode mode, loff_t start, loff_t end)
547 struct vvp_io *vio = vvp_env_io(env);
551 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
554 vvp_io_update_iov(env, vio, io);
556 if (io->u.ci_rw.crw_nonblock)
557 ast_flags |= CEF_NONBLOCK;
559 result = vvp_mmap_locks(env, vio, io);
561 result = vvp_io_one_lock(env, io, ast_flags, mode, start, end);
566 static int vvp_io_read_lock(const struct lu_env *env,
567 const struct cl_io_slice *ios)
569 struct cl_io *io = ios->cis_io;
570 struct cl_io_rw_common *rd = &io->u.ci_rd.rd;
574 result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos,
575 rd->crw_pos + rd->crw_count - 1);
579 static int vvp_io_fault_lock(const struct lu_env *env,
580 const struct cl_io_slice *ios)
582 struct cl_io *io = ios->cis_io;
583 struct vvp_io *vio = cl2vvp_io(env, ios);
585 * XXX LDLM_FL_CBPENDING
587 return vvp_io_one_lock_index(env,
589 vvp_mode_from_vma(vio->u.fault.ft_vma),
590 io->u.ci_fault.ft_index,
591 io->u.ci_fault.ft_index);
594 static int vvp_io_write_lock(const struct lu_env *env,
595 const struct cl_io_slice *ios)
597 struct cl_io *io = ios->cis_io;
601 if (io->u.ci_wr.wr_append) {
603 end = OBD_OBJECT_EOF;
605 start = io->u.ci_wr.wr.crw_pos;
606 end = start + io->u.ci_wr.wr.crw_count - 1;
608 return vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
611 static int vvp_io_setattr_iter_init(const struct lu_env *env,
612 const struct cl_io_slice *ios)
618 * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
620 * Handles "lockless io" mode when extent locking is done by server.
622 static int vvp_io_setattr_lock(const struct lu_env *env,
623 const struct cl_io_slice *ios)
625 struct cl_io *io = ios->cis_io;
629 if (cl_io_is_trunc(io)) {
630 new_size = io->u.ci_setattr.sa_attr.lvb_size;
632 enqflags = CEF_DISCARD_DATA;
634 unsigned int valid = io->u.ci_setattr.sa_valid;
636 if (!(valid & TIMES_SET_FLAGS))
639 if ((!(valid & ATTR_MTIME) ||
640 io->u.ci_setattr.sa_attr.lvb_mtime >=
641 io->u.ci_setattr.sa_attr.lvb_ctime) &&
642 (!(valid & ATTR_ATIME) ||
643 io->u.ci_setattr.sa_attr.lvb_atime >=
644 io->u.ci_setattr.sa_attr.lvb_ctime))
650 return vvp_io_one_lock(env, io, enqflags, CLM_WRITE,
651 new_size, OBD_OBJECT_EOF);
654 static int vvp_do_vmtruncate(struct inode *inode, size_t size)
659 * Only ll_inode_size_lock is taken at this level.
661 ll_inode_size_lock(inode);
662 result = inode_newsize_ok(inode, size);
664 ll_inode_size_unlock(inode);
667 i_size_write(inode, size);
669 ll_truncate_pagecache(inode, size);
670 ll_inode_size_unlock(inode);
674 static int vvp_io_setattr_trunc(const struct lu_env *env,
675 const struct cl_io_slice *ios,
676 struct inode *inode, loff_t size)
678 inode_dio_wait(inode);
682 static int vvp_io_setattr_time(const struct lu_env *env,
683 const struct cl_io_slice *ios)
685 struct cl_io *io = ios->cis_io;
686 struct cl_object *obj = io->ci_obj;
687 struct cl_attr *attr = vvp_env_thread_attr(env);
689 unsigned valid = CAT_CTIME;
691 cl_object_attr_lock(obj);
692 attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
693 if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) {
694 attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
697 if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) {
698 attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
701 result = cl_object_attr_update(env, obj, attr, valid);
702 cl_object_attr_unlock(obj);
707 static int vvp_io_setattr_start(const struct lu_env *env,
708 const struct cl_io_slice *ios)
710 struct cl_io *io = ios->cis_io;
711 struct inode *inode = vvp_object_inode(io->ci_obj);
714 mutex_lock(&inode->i_mutex);
715 if (cl_io_is_trunc(io))
716 result = vvp_io_setattr_trunc(env, ios, inode,
717 io->u.ci_setattr.sa_attr.lvb_size);
718 if (result == 0 && io->u.ci_setattr.sa_valid & TIMES_SET_FLAGS)
719 result = vvp_io_setattr_time(env, ios);
723 static void vvp_io_setattr_end(const struct lu_env *env,
724 const struct cl_io_slice *ios)
726 struct cl_io *io = ios->cis_io;
727 struct inode *inode = vvp_object_inode(io->ci_obj);
729 if (cl_io_is_trunc(io)) {
730 /* Truncate in memory pages - they must be clean pages
731 * because osc has already notified to destroy osc_extents. */
732 vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
733 inode_dio_write_done(inode);
735 mutex_unlock(&inode->i_mutex);
738 static void vvp_io_setattr_fini(const struct lu_env *env,
739 const struct cl_io_slice *ios)
741 vvp_io_fini(env, ios);
744 static int vvp_io_read_start(const struct lu_env *env,
745 const struct cl_io_slice *ios)
747 struct vvp_io *vio = cl2vvp_io(env, ios);
748 struct cl_io *io = ios->cis_io;
749 struct cl_object *obj = io->ci_obj;
750 struct inode *inode = vvp_object_inode(obj);
751 struct file *file = vio->vui_fd->fd_file;
754 loff_t pos = io->u.ci_rd.rd.crw_pos;
755 long cnt = io->u.ci_rd.rd.crw_count;
756 long tot = vio->vui_tot_count;
759 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
761 CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
763 if (!can_populate_pages(env, io, inode))
766 result = vvp_prep_size(env, obj, io, pos, tot, &exceed);
769 else if (exceed != 0)
772 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
773 "Read ino %lu, %lu bytes, offset %lld, size %llu\n",
774 inode->i_ino, cnt, pos, i_size_read(inode));
776 /* turn off the kernel's read-ahead */
777 vio->vui_fd->fd_file->f_ra.ra_pages = 0;
779 /* initialize read-ahead window once per syscall */
780 if (!vio->vui_ra_valid) {
781 vio->vui_ra_valid = true;
782 vio->vui_ra_start = cl_index(obj, pos);
783 vio->vui_ra_count = cl_index(obj, tot + PAGE_CACHE_SIZE - 1);
789 switch (vio->vui_io_subtype) {
791 LASSERT(vio->vui_iocb->ki_pos == pos);
792 result = generic_file_aio_read(vio->vui_iocb,
793 vio->vui_iov, vio->vui_nrsegs,
794 vio->vui_iocb->ki_pos);
797 result = generic_file_splice_read(file, &pos,
798 vio->u.splice.vui_pipe, cnt,
799 vio->u.splice.vui_flags);
800 /* LU-1109: do splice read stripe by stripe otherwise if it
801 * may make nfsd stuck if this read occupied all internal pipe
806 CERROR("Wrong IO type %u\n", vio->vui_io_subtype);
814 io->ci_nob += result;
815 ll_rw_stats_tally(ll_i2sbi(inode), current->pid, vio->vui_fd,
823 static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io,
824 struct cl_page_list *plist, int from, int to)
826 struct cl_2queue *queue = &io->ci_queue;
827 struct cl_page *page;
828 unsigned int bytes = 0;
832 if (plist->pl_nr == 0)
835 if (from > 0 || to != PAGE_SIZE) {
836 page = cl_page_list_first(plist);
837 if (plist->pl_nr == 1) {
838 cl_page_clip(env, page, from, to);
841 cl_page_clip(env, page, from, PAGE_SIZE);
842 if (to != PAGE_SIZE) {
843 page = cl_page_list_last(plist);
844 cl_page_clip(env, page, 0, to);
849 cl_2queue_init(queue);
850 cl_page_list_splice(plist, &queue->c2_qin);
851 rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0);
853 /* plist is not sorted any more */
854 cl_page_list_splice(&queue->c2_qin, plist);
855 cl_page_list_splice(&queue->c2_qout, plist);
856 cl_2queue_fini(env, queue);
859 /* calculate bytes */
860 bytes = plist->pl_nr << PAGE_SHIFT;
861 bytes -= from + PAGE_SIZE - to;
863 while (plist->pl_nr > 0) {
864 page = cl_page_list_first(plist);
865 cl_page_list_del(env, plist, page);
867 cl_page_clip(env, page, 0, PAGE_SIZE);
869 SetPageUptodate(cl_page_vmpage(page));
870 cl_page_disown(env, io, page);
872 /* held in ll_cl_init() */
873 lu_ref_del(&page->cp_reference, "cl_io", io);
874 cl_page_put(env, page);
878 RETURN(bytes > 0 ? bytes : rc);
881 static void write_commit_callback(const struct lu_env *env, struct cl_io *io,
882 struct cl_page *page)
884 struct page *vmpage = page->cp_vmpage;
886 SetPageUptodate(vmpage);
887 set_page_dirty(vmpage);
889 cl_page_disown(env, io, page);
891 /* held in ll_cl_init() */
892 lu_ref_del(&page->cp_reference, "cl_io", cl_io_top(io));
893 cl_page_put(env, page);
896 /* make sure the page list is contiguous */
897 static bool page_list_sanity_check(struct cl_object *obj,
898 struct cl_page_list *plist)
900 struct cl_page *page;
901 pgoff_t index = CL_PAGE_EOF;
903 cl_page_list_for_each(page, plist) {
904 struct vvp_page *vpg = cl_object_page_slice(obj, page);
906 if (index == CL_PAGE_EOF) {
907 index = vvp_index(vpg);
912 if (index == vvp_index(vpg))
920 /* Return how many bytes have queued or written */
921 int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io)
923 struct cl_object *obj = io->ci_obj;
924 struct inode *inode = vvp_object_inode(obj);
925 struct vvp_io *vio = vvp_env_io(env);
926 struct cl_page_list *queue = &vio->u.write.vui_queue;
927 struct cl_page *page;
930 unsigned int npages = vio->u.write.vui_queue.pl_nr;
936 CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n",
937 npages, vio->u.write.vui_from, vio->u.write.vui_to);
939 LASSERT(page_list_sanity_check(obj, queue));
941 /* submit IO with async write */
942 rc = cl_io_commit_async(env, io, queue,
943 vio->u.write.vui_from, vio->u.write.vui_to,
944 write_commit_callback);
945 npages -= queue->pl_nr; /* already committed pages */
947 /* calculate how many bytes were written */
948 bytes = npages << PAGE_SHIFT;
951 bytes -= vio->u.write.vui_from;
952 if (queue->pl_nr == 0) /* last page */
953 bytes -= PAGE_SIZE - vio->u.write.vui_to;
954 LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages);
956 vio->u.write.vui_written += bytes;
958 CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n",
959 npages, bytes, vio->u.write.vui_written);
961 /* the first page must have been written. */
962 vio->u.write.vui_from = 0;
964 LASSERT(page_list_sanity_check(obj, queue));
965 LASSERT(ergo(rc == 0, queue->pl_nr == 0));
967 /* out of quota, try sync write */
968 if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) {
969 rc = vvp_io_commit_sync(env, io, queue,
970 vio->u.write.vui_from,
971 vio->u.write.vui_to);
973 vio->u.write.vui_written += rc;
978 /* update inode size */
979 ll_merge_attr(env, inode);
981 /* Now the pages in queue were failed to commit, discard them
982 * unless they were dirtied before. */
983 while (queue->pl_nr > 0) {
984 page = cl_page_list_first(queue);
985 cl_page_list_del(env, queue, page);
987 if (!PageDirty(cl_page_vmpage(page)))
988 cl_page_discard(env, io, page);
990 cl_page_disown(env, io, page);
992 /* held in ll_cl_init() */
993 lu_ref_del(&page->cp_reference, "cl_io", io);
994 cl_page_put(env, page);
996 cl_page_list_fini(env, queue);
1001 static int vvp_io_write_start(const struct lu_env *env,
1002 const struct cl_io_slice *ios)
1004 struct vvp_io *vio = cl2vvp_io(env, ios);
1005 struct cl_io *io = ios->cis_io;
1006 struct cl_object *obj = io->ci_obj;
1007 struct inode *inode = vvp_object_inode(obj);
1009 loff_t pos = io->u.ci_wr.wr.crw_pos;
1010 size_t cnt = io->u.ci_wr.wr.crw_count;
1014 if (!can_populate_pages(env, io, inode))
1017 if (cl_io_is_append(io)) {
1019 * PARALLEL IO This has to be changed for parallel IO doing
1020 * out-of-order writes.
1022 ll_merge_attr(env, inode);
1023 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
1024 vio->vui_iocb->ki_pos = pos;
1026 LASSERT(vio->vui_iocb->ki_pos == pos);
1029 CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
1031 /* The maximum Lustre file size is variable, based on the OST maximum
1032 * object size and number of stripes. This needs another check in
1033 * addition to the VFS checks earlier. */
1034 if (pos + cnt > ll_file_maxbytes(inode)) {
1036 "%s: file "DFID" offset %llu > maxbytes "LPU64"\n",
1037 ll_get_fsname(inode->i_sb, NULL, 0),
1038 PFID(ll_inode2fid(inode)), pos + cnt,
1039 ll_file_maxbytes(inode));
1043 if (vio->vui_iov == NULL) {
1044 /* from a temp io in ll_cl_init(). */
1048 * When using the locked AIO function (generic_file_aio_write())
1049 * testing has shown the inode mutex to be a limiting factor
1050 * with multi-threaded single shared file performance. To get
1051 * around this, we now use the lockless version. To maintain
1052 * consistency, proper locking to protect against writes,
1053 * trucates, etc. is handled in the higher layers of lustre.
1055 result = __generic_file_aio_write(vio->vui_iocb,
1056 vio->vui_iov, vio->vui_nrsegs,
1057 &vio->vui_iocb->ki_pos);
1058 if (result > 0 || result == -EIOCBQUEUED) {
1061 err = generic_write_sync(vio->vui_iocb->ki_filp,
1063 if (err < 0 && result > 0)
1069 result = vvp_io_write_commit(env, io);
1070 if (vio->u.write.vui_written > 0) {
1071 result = vio->u.write.vui_written;
1072 io->ci_nob += result;
1074 CDEBUG(D_VFSTRACE, "write: nob %zd, result: %zd\n",
1075 io->ci_nob, result);
1079 struct ll_inode_info *lli = ll_i2info(inode);
1081 spin_lock(&lli->lli_lock);
1082 lli->lli_flags |= LLIF_DATA_MODIFIED;
1083 spin_unlock(&lli->lli_lock);
1086 io->ci_continue = 0;
1087 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
1088 vio->vui_fd, pos, result, WRITE);
1095 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
1097 struct vm_fault *vmf = cfio->ft_vmf;
1099 cfio->ft_flags = filemap_fault(cfio->ft_vma, vmf);
1100 cfio->ft_flags_valid = 1;
1103 LL_CDEBUG_PAGE(D_PAGE, vmf->page, "got addr %p type NOPAGE\n",
1104 vmf->virtual_address);
1105 if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) {
1106 lock_page(vmf->page);
1107 cfio->ft_flags |= VM_FAULT_LOCKED;
1110 cfio->ft_vmpage = vmf->page;
1115 if (cfio->ft_flags & VM_FAULT_SIGBUS) {
1116 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address);
1120 if (cfio->ft_flags & VM_FAULT_OOM) {
1121 CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address);
1125 if (cfio->ft_flags & VM_FAULT_RETRY)
1128 CERROR("unknown error in page fault %d\n", cfio->ft_flags);
1133 static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io,
1134 struct cl_page *page)
1136 set_page_dirty(page->cp_vmpage);
1139 static int vvp_io_fault_start(const struct lu_env *env,
1140 const struct cl_io_slice *ios)
1142 struct vvp_io *vio = cl2vvp_io(env, ios);
1143 struct cl_io *io = ios->cis_io;
1144 struct cl_object *obj = io->ci_obj;
1145 struct inode *inode = vvp_object_inode(obj);
1146 struct cl_fault_io *fio = &io->u.ci_fault;
1147 struct vvp_fault_io *cfio = &vio->u.fault;
1150 struct page *vmpage = NULL;
1151 struct cl_page *page;
1156 if (fio->ft_executable &&
1157 LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime)
1159 " changed while waiting for the page fault lock\n",
1160 PFID(lu_object_fid(&obj->co_lu)));
1162 /* offset of the last byte on the page */
1163 offset = cl_offset(obj, fio->ft_index + 1) - 1;
1164 LASSERT(cl_index(obj, offset) == fio->ft_index);
1165 result = vvp_prep_size(env, obj, io, 0, offset + 1, NULL);
1169 /* must return locked page */
1170 if (fio->ft_mkwrite) {
1171 LASSERT(cfio->ft_vmpage != NULL);
1172 lock_page(cfio->ft_vmpage);
1174 result = vvp_io_kernel_fault(cfio);
1179 vmpage = cfio->ft_vmpage;
1180 LASSERT(PageLocked(vmpage));
1182 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
1183 ll_invalidate_page(vmpage);
1185 size = i_size_read(inode);
1186 /* Though we have already held a cl_lock upon this page, but
1187 * it still can be truncated locally. */
1188 if (unlikely((vmpage->mapping != inode->i_mapping) ||
1189 (page_offset(vmpage) > size))) {
1190 CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
1192 /* return +1 to stop cl_io_loop() and ll_fault() will catch
1194 GOTO(out, result = +1);
1197 last_index = cl_index(obj, size - 1);
1199 if (fio->ft_mkwrite ) {
1201 * Capture the size while holding the lli_trunc_sem from above
1202 * we want to make sure that we complete the mkwrite action
1203 * while holding this lock. We need to make sure that we are
1204 * not past the end of the file.
1206 if (last_index < fio->ft_index) {
1208 "llite: mkwrite and truncate race happened: "
1209 "%p: 0x%lx 0x%lx\n",
1210 vmpage->mapping,fio->ft_index,last_index);
1212 * We need to return if we are
1213 * passed the end of the file. This will propagate
1214 * up the call stack to ll_page_mkwrite where
1215 * we will return VM_FAULT_NOPAGE. Any non-negative
1216 * value returned here will be silently
1217 * converted to 0. If the vmpage->mapping is null
1218 * the error code would be converted back to ENODATA
1219 * in ll_page_mkwrite0. Thus we return -ENODATA
1220 * to handle both cases
1222 GOTO(out, result = -ENODATA);
1226 page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
1228 GOTO(out, result = PTR_ERR(page));
1230 /* if page is going to be written, we should add this page into cache
1232 if (fio->ft_mkwrite) {
1233 wait_on_page_writeback(vmpage);
1234 if (!PageDirty(vmpage)) {
1235 struct cl_page_list *plist = &io->ci_queue.c2_qin;
1236 struct vvp_page *vpg = cl_object_page_slice(obj, page);
1239 /* vvp_page_assume() calls wait_on_page_writeback(). */
1240 cl_page_assume(env, io, page);
1242 cl_page_list_init(plist);
1243 cl_page_list_add(plist, page);
1246 if (last_index == vvp_index(vpg))
1247 to = size & ~PAGE_MASK;
1249 /* Do not set Dirty bit here so that in case IO is
1250 * started before the page is really made dirty, we
1251 * still have chance to detect it. */
1252 result = cl_io_commit_async(env, io, plist, 0, to,
1253 mkwrite_commit_callback);
1254 LASSERT(cl_page_is_owned(page, io));
1255 cl_page_list_fini(env, plist);
1259 cl_page_discard(env, io, page);
1260 cl_page_disown(env, io, page);
1262 cl_page_put(env, page);
1264 /* we're in big trouble, what can we do now? */
1265 if (result == -EDQUOT)
1269 cl_page_disown(env, io, page);
1274 * The ft_index is only used in the case of
1275 * a mkwrite action. We need to check
1276 * our assertions are correct, since
1277 * we should have caught this above
1279 LASSERT(!fio->ft_mkwrite || fio->ft_index <= last_index);
1280 if (fio->ft_index == last_index)
1282 * Last page is mapped partially.
1284 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
1286 fio->ft_nob = cl_page_size(obj);
1288 lu_ref_add(&page->cp_reference, "fault", io);
1289 fio->ft_page = page;
1293 /* return unlocked vmpage to avoid deadlocking */
1295 unlock_page(vmpage);
1297 cfio->ft_flags &= ~VM_FAULT_LOCKED;
1302 static int vvp_io_fsync_start(const struct lu_env *env,
1303 const struct cl_io_slice *ios)
1305 /* we should mark TOWRITE bit to each dirty page in radix tree to
1306 * verify pages have been written, but this is difficult because of
1311 static int vvp_io_read_ahead(const struct lu_env *env,
1312 const struct cl_io_slice *ios,
1313 pgoff_t start, struct cl_read_ahead *ra)
1318 if (ios->cis_io->ci_type == CIT_READ ||
1319 ios->cis_io->ci_type == CIT_FAULT) {
1320 struct vvp_io *vio = cl2vvp_io(env, ios);
1322 if (unlikely(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
1323 ra->cra_end = CL_PAGE_EOF;
1324 result = +1; /* no need to call down */
1331 static void vvp_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
1333 CLOBINVRNT(env, ios->cis_io->ci_obj,
1334 vvp_object_invariant(ios->cis_io->ci_obj));
1337 static const struct cl_io_operations vvp_io_ops = {
1340 .cio_fini = vvp_io_fini,
1341 .cio_lock = vvp_io_read_lock,
1342 .cio_start = vvp_io_read_start,
1343 .cio_advance = vvp_io_advance,
1346 .cio_fini = vvp_io_fini,
1347 .cio_iter_init = vvp_io_write_iter_init,
1348 .cio_iter_fini = vvp_io_write_iter_fini,
1349 .cio_lock = vvp_io_write_lock,
1350 .cio_start = vvp_io_write_start,
1351 .cio_advance = vvp_io_advance,
1354 .cio_fini = vvp_io_setattr_fini,
1355 .cio_iter_init = vvp_io_setattr_iter_init,
1356 .cio_lock = vvp_io_setattr_lock,
1357 .cio_start = vvp_io_setattr_start,
1358 .cio_end = vvp_io_setattr_end
1361 .cio_fini = vvp_io_fault_fini,
1362 .cio_iter_init = vvp_io_fault_iter_init,
1363 .cio_lock = vvp_io_fault_lock,
1364 .cio_start = vvp_io_fault_start,
1365 .cio_end = vvp_io_end,
1368 .cio_start = vvp_io_fsync_start,
1369 .cio_fini = vvp_io_fini
1372 .cio_fini = vvp_io_fini
1375 .cio_read_ahead = vvp_io_read_ahead
1378 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
1381 struct vvp_io *vio = vvp_env_io(env);
1382 struct inode *inode = vvp_object_inode(obj);
1385 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
1388 CDEBUG(D_VFSTRACE, DFID" ignore/verify layout %d/%d, layout version %d "
1389 "restore needed %d\n",
1390 PFID(lu_object_fid(&obj->co_lu)),
1391 io->ci_ignore_layout, io->ci_verify_layout,
1392 vio->vui_layout_gen, io->ci_restore_needed);
1394 CL_IO_SLICE_CLEAN(vio, vui_cl);
1395 cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops);
1396 vio->vui_ra_valid = false;
1398 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
1400 struct ll_inode_info *lli = ll_i2info(inode);
1402 count = io->u.ci_rw.crw_count;
1403 /* "If nbyte is 0, read() will return 0 and have no other
1404 * results." -- Single Unix Spec */
1408 vio->vui_tot_count = count;
1409 vio->vui_tot_nrsegs = 0;
1412 /* for read/write, we store the jobid in the inode, and
1413 * it'll be fetched by osc when building RPC.
1415 * it's not accurate if the file is shared by different
1418 lustre_get_jobid(lli->lli_jobid);
1419 } else if (io->ci_type == CIT_SETATTR) {
1420 if (!cl_io_is_trunc(io))
1421 io->ci_lockreq = CILR_MANDATORY;
1424 /* ignore layout change for generic CIT_MISC but not for glimpse.
1425 * io context for glimpse must set ci_verify_layout to true,
1426 * see cl_glimpse_size0() for details. */
1427 if (io->ci_type == CIT_MISC && !io->ci_verify_layout)
1428 io->ci_ignore_layout = 1;
1430 /* Enqueue layout lock and get layout version. We need to do this
1431 * even for operations requiring to open file, such as read and write,
1432 * because it might not grant layout lock in IT_OPEN. */
1433 if (result == 0 && !io->ci_ignore_layout) {
1434 result = ll_layout_refresh(inode, &vio->vui_layout_gen);
1435 if (result == -ENOENT)
1436 /* If the inode on MDS has been removed, but the objects
1437 * on OSTs haven't been destroyed (async unlink), layout
1438 * fetch will return -ENOENT, we'd ingore this error
1439 * and continue with dirty flush. LU-3230. */
1442 CERROR("%s: refresh file layout " DFID " error %d.\n",
1443 ll_get_fsname(inode->i_sb, NULL, 0),
1444 PFID(lu_object_fid(&obj->co_lu)), result);