1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
30 * Use is subject to license terms.
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>
41 #define DEBUG_SUBSYSTEM S_LLITE
44 # error This file is kernel only.
48 #include <lustre_lite.h>
50 #include "vvp_internal.h"
52 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
53 const struct cl_io_slice *slice);
56 * True, if \a io is a normal io, False for sendfile() / splice_{read|write}
58 int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
60 struct vvp_io *vio = vvp_env_io(env);
62 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
64 return vio->cui_io_subtype == IO_NORMAL;
67 /*****************************************************************************
73 static int vvp_io_fault_iter_init(const struct lu_env *env,
74 const struct cl_io_slice *ios)
76 struct vvp_io *vio = cl2vvp_io(env, ios);
77 struct inode *inode = ccc_object_inode(ios->cis_obj);
80 cl2ccc_io(env, ios)->cui_fd->fd_file->f_dentry->d_inode);
81 vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime);
85 static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
87 struct cl_io *io = ios->cis_io;
88 struct cl_object *obj = io->ci_obj;
90 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
91 if (io->ci_type == CIT_READ) {
92 struct vvp_io *vio = cl2vvp_io(env, ios);
93 struct ccc_io *cio = cl2ccc_io(env, ios);
95 if (vio->cui_ra_window_set)
96 ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead);
101 static void vvp_io_fault_fini(const struct lu_env *env,
102 const struct cl_io_slice *ios)
104 struct cl_io *io = ios->cis_io;
105 struct cl_page *page = io->u.ci_fault.ft_page;
107 CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
110 lu_ref_del(&page->cp_reference, "fault", io);
111 cl_page_put(env, page);
112 io->u.ci_fault.ft_page = NULL;
114 vvp_io_fini(env, ios);
117 enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
120 * we only want to hold PW locks if the mmap() can generate
121 * writes back to the file and that only happens in shared
124 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
129 static int vvp_mmap_locks(const struct lu_env *env,
130 struct ccc_io *vio, struct cl_io *io)
132 struct ccc_thread_info *cti = ccc_env_info(env);
133 struct vm_area_struct *vma;
134 struct cl_lock_descr *descr = &cti->cti_descr;
135 ldlm_policy_data_t policy;
142 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
144 if (!cl_is_normalio(env, io))
147 for (seg = 0; seg < vio->cui_nrsegs; seg++) {
148 const struct iovec *iv = &vio->cui_iov[seg];
150 addr = (unsigned long)iv->iov_base;
155 count += addr & (~CFS_PAGE_MASK);
156 addr &= CFS_PAGE_MASK;
157 while((vma = our_vma(addr, count)) != NULL) {
158 struct inode *inode = vma->vm_file->f_dentry->d_inode;
159 int flags = CEF_MUST;
161 if (ll_file_nolock(vma->vm_file)) {
163 * For no lock case, a lockless lock will be
170 * XXX: Required lock mode can be weakened: CIT_WRITE
171 * io only ever reads user level buffer, and CIT_READ
174 policy_from_vma(&policy, vma, addr, count);
175 descr->cld_mode = vvp_mode_from_vma(vma);
176 descr->cld_obj = ll_i2info(inode)->lli_clob;
177 descr->cld_start = cl_index(descr->cld_obj,
178 policy.l_extent.start);
179 descr->cld_end = cl_index(descr->cld_obj,
180 policy.l_extent.end);
181 result = cl_io_lock_alloc_add(env, io, descr, flags);
185 if (vma->vm_end - addr >= count)
188 count -= vma->vm_end - addr;
195 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
196 enum cl_lock_mode mode, loff_t start, loff_t end)
198 struct ccc_io *cio = ccc_env_io(env);
202 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
203 LASSERT(vvp_env_io(env)->cui_oneshot == 0);
206 ccc_io_update_iov(env, cio, io);
208 if (io->u.ci_rw.crw_nonblock)
209 ast_flags |= CEF_NONBLOCK;
210 result = vvp_mmap_locks(env, cio, io);
212 result = ccc_io_one_lock(env, io, ast_flags, mode, start, end);
216 static int vvp_io_read_lock(const struct lu_env *env,
217 const struct cl_io_slice *ios)
219 struct cl_io *io = ios->cis_io;
220 struct ll_inode_info *lli = ll_i2info(ccc_object_inode(io->ci_obj));
224 /* XXX: Layer violation, we shouldn't see lsm at llite level. */
225 if (lli->lli_smd != NULL) /* lsm-less file, don't need to lock */
226 result = vvp_io_rw_lock(env, io, CLM_READ,
227 io->u.ci_rd.rd.crw_pos,
228 io->u.ci_rd.rd.crw_pos +
229 io->u.ci_rd.rd.crw_count - 1);
235 static int vvp_io_fault_lock(const struct lu_env *env,
236 const struct cl_io_slice *ios)
238 struct cl_io *io = ios->cis_io;
239 struct vvp_io *vio = cl2vvp_io(env, ios);
241 * XXX LDLM_FL_CBPENDING
243 return ccc_io_one_lock_index
244 (env, io, 0, vvp_mode_from_vma(vio->u.fault.ft_vma),
245 io->u.ci_fault.ft_index, io->u.ci_fault.ft_index);
248 static int vvp_io_write_lock(const struct lu_env *env,
249 const struct cl_io_slice *ios)
251 struct cl_io *io = ios->cis_io;
256 if (cl2vvp_io(env, ios)->cui_oneshot == 0) {
257 if (io->u.ci_wr.wr_append) {
259 end = OBD_OBJECT_EOF;
261 start = io->u.ci_wr.wr.crw_pos;
262 end = start + io->u.ci_wr.wr.crw_count - 1;
264 result = vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
270 static int vvp_io_trunc_iter_init(const struct lu_env *env,
271 const struct cl_io_slice *ios)
273 struct ccc_io *vio = cl2ccc_io(env, ios);
274 struct inode *inode = ccc_object_inode(ios->cis_obj);
277 * We really need to get our PW lock before we change inode->i_size.
278 * If we don't we can race with other i_size updaters on our node,
279 * like ll_file_read. We can also race with i_size propogation to
280 * other nodes through dirtying and writeback of final cached pages.
281 * This last one is especially bad for racing o_append users on other
285 UNLOCK_INODE_MUTEX(inode);
286 UP_WRITE_I_ALLOC_SEM(inode);
287 vio->u.trunc.cui_locks_released = 1;
292 * Implementation of cl_io_operations::cio_lock() method for CIT_TRUNC io.
294 * Handles "lockless io" mode when extent locking is done by server.
296 static int vvp_io_trunc_lock(const struct lu_env *env,
297 const struct cl_io_slice *ios)
299 struct ccc_io *vio = cl2ccc_io(env, ios);
300 struct cl_io *io = ios->cis_io;
301 size_t new_size = io->u.ci_truncate.tr_size;
302 __u32 enqflags = new_size == 0 ? CEF_DISCARD_DATA : 0;
305 vio->u.trunc.cui_local_lock = TRUNC_EXTENT;
306 result = ccc_io_one_lock(env, io, enqflags, CLM_WRITE,
307 new_size, OBD_OBJECT_EOF);
311 static int vvp_io_trunc_start(const struct lu_env *env,
312 const struct cl_io_slice *ios)
314 struct ccc_io *cio = cl2ccc_io(env, ios);
315 struct vvp_io *vio = cl2vvp_io(env, ios);
316 struct cl_io *io = ios->cis_io;
317 struct inode *inode = ccc_object_inode(io->ci_obj);
318 struct cl_object *obj = ios->cis_obj;
319 size_t size = io->u.ci_truncate.tr_size;
320 pgoff_t start = cl_index(obj, size);
323 LASSERT(cio->u.trunc.cui_locks_released);
324 LASSERT(vio->cui_oneshot == 0);
326 LOCK_INODE_MUTEX(inode);
327 DOWN_WRITE_I_ALLOC_SEM(inode);
328 cio->u.trunc.cui_locks_released = 0;
331 * Only ll_inode_size_lock is taken at this level. lov_stripe_lock()
332 * is grabbed by ll_truncate() only over call to obd_adjust_kms(). If
333 * vmtruncate returns 0, then ll_truncate dropped ll_inode_size_lock()
335 ll_inode_size_lock(inode, 0);
336 result = vmtruncate(inode, size);
338 ll_inode_size_unlock(inode, 0);
340 * If a page is partially truncated, keep it owned across truncate to
343 * XXX this properly belongs to osc, because races in question are OST
346 if (cl_offset(obj, start) != size) {
347 struct cl_object_header *hdr;
349 hdr = cl_object_header(obj);
350 spin_lock(&hdr->coh_page_guard);
351 vio->cui_partpage = cl_page_lookup(hdr, start);
352 spin_unlock(&hdr->coh_page_guard);
354 if (vio->cui_partpage != NULL)
356 * Wait for the transfer completion for a partially
357 * truncated page to avoid dead-locking an OST with
358 * the concurrent page-wise overlapping WRITE and
359 * PUNCH requests. BUG:17397.
361 * Partial page is disowned in vvp_io_trunc_end().
363 cl_page_own(env, io, vio->cui_partpage);
365 vio->cui_partpage = NULL;
369 static void vvp_io_trunc_end(const struct lu_env *env,
370 const struct cl_io_slice *ios)
372 struct vvp_io *vio = cl2vvp_io(env, ios);
374 if (vio->cui_partpage != NULL) {
375 cl_page_disown(env, ios->cis_io, vio->cui_partpage);
376 cl_page_put(env, vio->cui_partpage);
377 vio->cui_partpage = NULL;
381 static void vvp_io_trunc_fini(const struct lu_env *env,
382 const struct cl_io_slice *ios)
384 struct ccc_io *cio = ccc_env_io(env);
385 struct inode *inode = ccc_object_inode(ios->cis_io->ci_obj);
387 if (cio->u.trunc.cui_locks_released) {
388 LOCK_INODE_MUTEX(inode);
389 DOWN_WRITE_I_ALLOC_SEM(inode);
390 cio->u.trunc.cui_locks_released = 0;
392 vvp_io_fini(env, ios);
395 #ifdef HAVE_FILE_READV
396 static ssize_t lustre_generic_file_read(struct file *file,
397 struct ccc_io *vio, loff_t *ppos)
399 return generic_file_readv(file, vio->cui_iov, vio->cui_nrsegs, ppos);
402 static ssize_t lustre_generic_file_write(struct file *file,
403 struct ccc_io *vio, loff_t *ppos)
405 return generic_file_writev(file, vio->cui_iov, vio->cui_nrsegs, ppos);
408 static ssize_t lustre_generic_file_read(struct file *file,
409 struct ccc_io *vio, loff_t *ppos)
411 return generic_file_aio_read(vio->cui_iocb, vio->cui_iov,
412 vio->cui_nrsegs, *ppos);
415 static ssize_t lustre_generic_file_write(struct file *file,
416 struct ccc_io *vio, loff_t *ppos)
418 return generic_file_aio_write(vio->cui_iocb, vio->cui_iov,
419 vio->cui_nrsegs, *ppos);
423 static int vvp_io_read_start(const struct lu_env *env,
424 const struct cl_io_slice *ios)
426 struct vvp_io *vio = cl2vvp_io(env, ios);
427 struct ccc_io *cio = cl2ccc_io(env, ios);
428 struct cl_io *io = ios->cis_io;
429 struct cl_object *obj = io->ci_obj;
430 struct inode *inode = ccc_object_inode(obj);
431 struct ll_ra_read *bead = &vio->cui_bead;
432 struct file *file = cio->cui_fd->fd_file;
435 loff_t pos = io->u.ci_rd.rd.crw_pos;
436 long cnt = io->u.ci_rd.rd.crw_count;
437 long tot = cio->cui_tot_count;
440 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
441 LASSERT(vio->cui_oneshot == 0);
443 CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
445 result = ccc_prep_size(env, obj, io, pos, tot, 1, &exceed);
448 else if (exceed != 0)
451 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
452 "Read ino %lu, %lu bytes, offset %lld, size %llu\n",
453 inode->i_ino, cnt, pos, i_size_read(inode));
455 /* turn off the kernel's read-ahead */
456 cio->cui_fd->fd_file->f_ra.ra_pages = 0;
458 /* initialize read-ahead window once per syscall */
459 if (!vio->cui_ra_window_set) {
460 vio->cui_ra_window_set = 1;
461 bead->lrr_start = cl_index(obj, pos);
463 * XXX: explicit CFS_PAGE_SIZE
465 bead->lrr_count = cl_index(obj, tot + CFS_PAGE_SIZE - 1);
466 ll_ra_read_in(file, bead);
471 switch (vio->cui_io_subtype) {
473 result = lustre_generic_file_read(file, cio, &pos);
475 #ifdef HAVE_KERNEL_SENDFILE
477 result = generic_file_sendfile(file, &pos, cnt,
478 vio->u.sendfile.cui_actor,
479 vio->u.sendfile.cui_target);
482 #ifdef HAVE_KERNEL_SPLICE_READ
484 result = generic_file_splice_read(file, &pos,
485 vio->u.splice.cui_pipe, cnt,
486 vio->u.splice.cui_flags);
490 CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
498 io->ci_nob += result;
499 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
500 cio->cui_fd, pos, result, 0);
506 static int vvp_io_write_start(const struct lu_env *env,
507 const struct cl_io_slice *ios)
509 struct ccc_io *cio = cl2ccc_io(env, ios);
510 struct cl_io *io = ios->cis_io;
511 struct cl_object *obj = io->ci_obj;
512 struct inode *inode = ccc_object_inode(obj);
513 struct file *file = cio->cui_fd->fd_file;
515 loff_t pos = io->u.ci_wr.wr.crw_pos;
516 size_t cnt = io->u.ci_wr.wr.crw_count;
520 if (cl_io_is_append(io)) {
522 * PARALLEL IO This has to be changed for parallel IO doing
523 * out-of-order writes.
525 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
526 #ifndef HAVE_FILE_WRITEV
527 cio->cui_iocb->ki_pos = pos;
531 CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
533 if (cl2vvp_io(env, ios)->cui_oneshot > 0)
536 result = lustre_generic_file_write(file, cio, &pos);
541 io->ci_nob += result;
542 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
543 cio->cui_fd, pos, result, 0);
549 #ifndef HAVE_VM_OP_FAULT
550 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
554 vmpage = filemap_nopage(cfio->ft_vma, cfio->nopage.ft_address,
555 cfio->nopage.ft_type);
557 if (vmpage == NOPAGE_SIGBUS) {
558 CDEBUG(D_PAGE, "got addr %lu type %lx - SIGBUS\n",
559 cfio->nopage.ft_address,(long)cfio->nopage.ft_type);
561 } else if (vmpage == NOPAGE_OOM) {
562 CDEBUG(D_PAGE, "got addr %lu type %lx - OOM\n",
563 cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
567 LL_CDEBUG_PAGE(D_PAGE, vmpage, "got addr %lu type %lx\n",
568 cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
570 cfio->ft_vmpage = vmpage;
575 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
577 cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, cfio->fault.ft_vmf);
579 if (cfio->fault.ft_vmf->page) {
580 LL_CDEBUG_PAGE(D_PAGE, cfio->fault.ft_vmf->page,
581 "got addr %p type NOPAGE\n",
582 cfio->fault.ft_vmf->virtual_address);
583 /*XXX workaround to bug in CLIO - he deadlocked with
584 lock cancel if page locked */
585 if (likely(cfio->fault.ft_flags & VM_FAULT_LOCKED)) {
586 unlock_page(cfio->fault.ft_vmf->page);
587 cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
590 cfio->ft_vmpage = cfio->fault.ft_vmf->page;
594 if (unlikely (cfio->fault.ft_flags & VM_FAULT_ERROR)) {
595 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n",
596 cfio->fault.ft_vmf->virtual_address);
600 if (unlikely (cfio->fault.ft_flags & VM_FAULT_NOPAGE)) {
601 CDEBUG(D_PAGE, "got addr %p - OOM\n",
602 cfio->fault.ft_vmf->virtual_address);
606 CERROR("unknow error in page fault!\n");
612 static int vvp_io_fault_start(const struct lu_env *env,
613 const struct cl_io_slice *ios)
615 struct vvp_io *vio = cl2vvp_io(env, ios);
616 struct cl_io *io = ios->cis_io;
617 struct cl_object *obj = io->ci_obj;
618 struct inode *inode = ccc_object_inode(obj);
619 struct cl_fault_io *fio = &io->u.ci_fault;
620 struct vvp_fault_io *cfio = &vio->u.fault;
622 int kernel_result = 0;
624 struct cl_page *page;
626 pgoff_t last; /* last page in a file data region */
628 LASSERT(vio->cui_oneshot == 0);
630 if (fio->ft_executable &&
631 LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime)
633 " changed while waiting for the page fault lock\n",
634 PFID(lu_object_fid(&obj->co_lu)));
636 /* offset of the last byte on the page */
637 offset = cl_offset(obj, fio->ft_index + 1) - 1;
638 LASSERT(cl_index(obj, offset) == fio->ft_index);
639 result = ccc_prep_size(env, obj, io, 0, offset + 1, 0, NULL);
643 /* must return locked page */
644 kernel_result = vvp_io_kernel_fault(cfio);
645 if (kernel_result != 0)
646 return kernel_result;
647 /* Temporarily lock vmpage to keep cl_page_find() happy. */
648 lock_page(cfio->ft_vmpage);
649 page = cl_page_find(env, obj, fio->ft_index, cfio->ft_vmpage,
651 unlock_page(cfio->ft_vmpage);
653 page_cache_release(cfio->ft_vmpage);
654 cfio->ft_vmpage = NULL;
655 return PTR_ERR(page);
658 size = i_size_read(inode);
659 last = cl_index(obj, size - 1);
660 if (fio->ft_index == last)
662 * Last page is mapped partially.
664 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
666 fio->ft_nob = cl_page_size(obj);
668 lu_ref_add(&page->cp_reference, "fault", io);
671 * Certain 2.6 kernels return not-NULL from
672 * filemap_nopage() when page is beyond the file size,
673 * on the grounds that "An external ptracer can access
674 * pages that normally aren't accessible.." Don't
675 * propagate such page fault to the lower layers to
676 * avoid side-effects like KMS updates.
678 if (fio->ft_index > last)
684 static int vvp_io_read_page(const struct lu_env *env,
685 const struct cl_io_slice *ios,
686 const struct cl_page_slice *slice)
688 struct cl_io *io = ios->cis_io;
689 struct cl_object *obj = slice->cpl_obj;
690 struct ccc_page *cp = cl2ccc_page(slice);
691 struct cl_page *page = slice->cpl_page;
692 struct inode *inode = ccc_object_inode(obj);
693 struct ll_sb_info *sbi = ll_i2sbi(inode);
694 struct ll_file_data *fd = cl2ccc_io(env, ios)->cui_fd;
695 struct ll_readahead_state *ras = &fd->fd_ras;
696 cfs_page_t *vmpage = cp->cpg_page;
697 struct cl_2queue *queue = &io->ci_queue;
700 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
701 LASSERT(cl2vvp_io(env, ios)->cui_oneshot == 0);
702 LASSERT(slice->cpl_obj == obj);
706 if (sbi->ll_ra_info.ra_max_pages_per_file)
707 ras_update(sbi, inode, ras, page->cp_index,
708 cp->cpg_defer_uptodate);
710 /* Sanity check whether the page is protected by a lock. */
711 rc = cl_page_is_under_lock(env, io, page);
713 CL_PAGE_HEADER(D_WARNING, env, page, "%s: %i\n",
714 rc == -ENODATA ? "without a lock" :
720 if (cp->cpg_defer_uptodate) {
722 cl_page_export(env, page, 1);
725 * Add page into the queue even when it is marked uptodate above.
726 * this will unlock it automatically as part of cl_page_list_disown().
728 cl_2queue_add(queue, page);
729 if (sbi->ll_ra_info.ra_max_pages_per_file)
730 ll_readahead(env, io, ras,
731 vmpage->mapping, &queue->c2_qin, fd->fd_flags);
736 static int vvp_page_sync_io(const struct lu_env *env, struct cl_io *io,
737 struct cl_page *page, struct ccc_page *cp,
738 int to, enum cl_req_type crt)
740 struct cl_2queue *queue;
743 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
745 queue = &io->ci_queue;
747 cl_2queue_init_page(queue, page);
748 cl_page_clip(env, page, 0, to);
750 result = cl_io_submit_sync(env, io, crt, queue, CRP_NORMAL, 0);
751 LASSERT(cl_page_is_owned(page, io));
752 cl_page_clip(env, page, 0, CFS_PAGE_SIZE);
756 * in CRT_WRITE case page is left locked even in case of
759 cl_page_list_disown(env, io, &queue->c2_qin);
760 cl_2queue_fini(env, queue);
766 * Prepare partially written-to page for a write.
768 static int vvp_io_prepare_partial(const struct lu_env *env, struct cl_io *io,
769 struct cl_object *obj, struct cl_page *pg,
771 unsigned from, unsigned to)
773 struct cl_attr *attr = ccc_env_thread_attr(env);
774 loff_t offset = cl_offset(obj, pg->cp_index);
777 cl_object_attr_lock(obj);
778 result = cl_object_attr_get(env, obj, attr);
779 cl_object_attr_unlock(obj);
782 * If are writing to a new page, no need to read old data.
783 * The extent locking will have updated the KMS, and for our
784 * purposes here we can treat it like i_size.
786 if (attr->cat_kms <= offset) {
787 char *kaddr = kmap_atomic(cp->cpg_page, KM_USER0);
789 memset(kaddr, 0, cl_page_size(obj));
790 kunmap_atomic(kaddr, KM_USER0);
791 } else if (cp->cpg_defer_uptodate)
794 result = vvp_page_sync_io(env, io, pg, cp,
795 CFS_PAGE_SIZE, CRT_READ);
797 * In older implementations, obdo_refresh_inode is called here
798 * to update the inode because the write might modify the
799 * object info at OST. However, this has been proven useless,
800 * since LVB functions will be called when user space program
801 * tries to retrieve inode attribute. Also, see bug 15909 for
805 cl_page_export(env, pg, 1);
810 static int vvp_io_prepare_write(const struct lu_env *env,
811 const struct cl_io_slice *ios,
812 const struct cl_page_slice *slice,
813 unsigned from, unsigned to)
815 struct cl_object *obj = slice->cpl_obj;
816 struct ccc_page *cp = cl2ccc_page(slice);
817 struct cl_page *pg = slice->cpl_page;
818 cfs_page_t *vmpage = cp->cpg_page;
824 LINVRNT(cl_page_is_vmlocked(env, pg));
825 LASSERT(vmpage->mapping->host == ccc_object_inode(obj));
829 CL_PAGE_HEADER(D_PAGE, env, pg, "preparing: [%d, %d]\n", from, to);
830 if (!PageUptodate(vmpage)) {
832 * We're completely overwriting an existing page, so _don't_
833 * set it up to date until commit_write
835 if (from == 0 && to == CFS_PAGE_SIZE) {
836 CL_PAGE_HEADER(D_PAGE, env, pg, "full page write\n");
837 POISON_PAGE(page, 0x11);
839 result = vvp_io_prepare_partial(env, ios->cis_io, obj,
842 CL_PAGE_HEADER(D_PAGE, env, pg, "uptodate\n");
846 static int vvp_io_commit_write(const struct lu_env *env,
847 const struct cl_io_slice *ios,
848 const struct cl_page_slice *slice,
849 unsigned from, unsigned to)
851 struct cl_object *obj = slice->cpl_obj;
852 struct cl_io *io = ios->cis_io;
853 struct ccc_page *cp = cl2ccc_page(slice);
854 struct cl_page *pg = slice->cpl_page;
855 struct inode *inode = ccc_object_inode(obj);
856 struct ll_sb_info *sbi = ll_i2sbi(inode);
857 cfs_page_t *vmpage = cp->cpg_page;
865 LINVRNT(cl_page_is_vmlocked(env, pg));
866 LASSERT(vmpage->mapping->host == inode);
868 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "commiting page write\n");
869 CL_PAGE_HEADER(D_PAGE, env, pg, "committing: [%d, %d]\n", from, to);
872 * queue a write for some time in the future the first time we
875 * This is different from what other file systems do: they usually
876 * just mark page (and some of its buffers) dirty and rely on
877 * balance_dirty_pages() to start a write-back. Lustre wants write-back
878 * to be started earlier for the following reasons:
880 * (1) with a large number of clients we need to limit the amount
881 * of cached data on the clients a lot;
883 * (2) large compute jobs generally want compute-only then io-only
884 * and the IO should complete as quickly as possible;
886 * (3) IO is batched up to the RPC size and is async until the
887 * client max cache is hit
888 * (/proc/fs/lustre/osc/OSC.../max_dirty_mb)
891 if (!PageDirty(vmpage)) {
892 tallyop = LPROC_LL_DIRTY_MISSES;
893 vvp_write_pending(cl2ccc(obj), cp);
894 set_page_dirty(vmpage);
895 /* ll_set_page_dirty() does the same for now, but
896 * it will not soon. */
897 vvp_write_pending(cl2ccc(obj), cp);
898 result = cl_page_cache_add(env, io, pg, CRT_WRITE);
899 if (result == -EDQUOT)
901 * Client ran out of disk space grant. Possible
904 * (a) do a sync write, renewing grant;
906 * (b) stop writing on this stripe, switch to the
909 * (b) is a part of "parallel io" design that is the
910 * ultimate goal. (a) is what "old" client did, and
911 * what the new code continues to do for the time
914 result = vvp_page_sync_io(env, io, pg, cp,
917 CERROR("Write page %lu of inode %p failed %d\n",
918 pg->cp_index, inode, result);
920 tallyop = LPROC_LL_DIRTY_HITS;
923 ll_stats_ops_tally(sbi, tallyop, 1);
925 size = cl_offset(obj, pg->cp_index) + to;
928 if (size > i_size_read(inode))
929 i_size_write(inode, size);
930 cl_page_export(env, pg, 1);
931 } else if (size > i_size_read(inode))
932 cl_page_discard(env, io, pg);
936 static const struct cl_io_operations vvp_io_ops = {
939 .cio_fini = vvp_io_fini,
940 .cio_lock = vvp_io_read_lock,
941 .cio_start = vvp_io_read_start,
942 .cio_advance = ccc_io_advance
945 .cio_fini = vvp_io_fini,
946 .cio_lock = vvp_io_write_lock,
947 .cio_start = vvp_io_write_start,
948 .cio_advance = ccc_io_advance
951 .cio_fini = vvp_io_trunc_fini,
952 .cio_iter_init = vvp_io_trunc_iter_init,
953 .cio_lock = vvp_io_trunc_lock,
954 .cio_start = vvp_io_trunc_start,
955 .cio_end = vvp_io_trunc_end
958 .cio_fini = vvp_io_fault_fini,
959 .cio_iter_init = vvp_io_fault_iter_init,
960 .cio_lock = vvp_io_fault_lock,
961 .cio_start = vvp_io_fault_start,
962 .cio_end = ccc_io_end
965 .cio_fini = vvp_io_fini
968 .cio_read_page = vvp_io_read_page,
969 .cio_prepare_write = vvp_io_prepare_write,
970 .cio_commit_write = vvp_io_commit_write
973 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
976 struct vvp_io *vio = vvp_env_io(env);
977 struct ccc_io *cio = ccc_env_io(env);
978 struct inode *inode = ccc_object_inode(obj);
979 struct ll_sb_info *sbi = ll_i2sbi(inode);
982 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
985 CL_IO_SLICE_CLEAN(cio, cui_cl);
986 cl_io_slice_add(io, &cio->cui_cl, obj, &vvp_io_ops);
987 vio->cui_oneshot = 0;
988 vio->cui_ra_window_set = 0;
990 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
994 count = io->u.ci_rw.crw_count;
995 op = io->ci_type == CIT_READ ?
996 LPROC_LL_READ_BYTES : LPROC_LL_WRITE_BYTES;
997 /* "If nbyte is 0, read() will return 0 and have no other
998 * results." -- Single Unix Spec */
1002 cio->cui_tot_count = count;
1003 cio->cui_tot_nrsegs = 0;
1004 ll_stats_ops_tally(sbi, op, count);
1006 } else if (io->ci_type == CIT_TRUNC) {
1007 /* lockless truncate? */
1008 ll_stats_ops_tally(sbi, LPROC_LL_TRUNC, 1);
1013 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
1014 const struct cl_io_slice *slice)
1016 /* Caling just for assertion */
1017 cl2ccc_io(env, slice);
1018 return vvp_env_io(env);