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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, 2012, 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 <lustre_lite.h>
48 #include "vvp_internal.h"
50 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
51 const struct cl_io_slice *slice);
54 * True, if \a io is a normal io, False for splice_{read,write}
56 int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
58 struct vvp_io *vio = vvp_env_io(env);
60 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
62 return vio->cui_io_subtype == IO_NORMAL;
66 * For swapping layout. The file's layout may have changed.
67 * To avoid populating pages to a wrong stripe, we have to verify the
68 * correctness of layout. It works because swapping layout processes
69 * have to acquire group lock.
71 static bool can_populate_pages(const struct lu_env *env, struct cl_io *io,
74 struct ll_inode_info *lli = ll_i2info(inode);
75 struct ccc_io *cio = ccc_env_io(env);
78 switch (io->ci_type) {
81 /* don't need lock here to check lli_layout_gen as we have held
82 * extent lock and GROUP lock has to hold to swap layout */
83 if (lli->lli_layout_gen != cio->cui_layout_gen) {
84 io->ci_need_restart = 1;
85 /* this will return application a short read/write */
90 /* fault is okay because we've already had a page. */
98 /*****************************************************************************
104 static int vvp_io_fault_iter_init(const struct lu_env *env,
105 const struct cl_io_slice *ios)
107 struct vvp_io *vio = cl2vvp_io(env, ios);
108 struct inode *inode = ccc_object_inode(ios->cis_obj);
111 cl2ccc_io(env, ios)->cui_fd->fd_file->f_dentry->d_inode);
112 vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime);
116 static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
118 struct cl_io *io = ios->cis_io;
119 struct cl_object *obj = io->ci_obj;
120 struct ccc_io *cio = cl2ccc_io(env, ios);
122 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
124 CDEBUG(D_VFSTRACE, DFID
125 " ignore/verify layout %d/%d, layout version %d restore needed %d\n",
126 PFID(lu_object_fid(&obj->co_lu)),
127 io->ci_ignore_layout, io->ci_verify_layout,
128 cio->cui_layout_gen, io->ci_restore_needed);
130 if (io->ci_restore_needed == 1) {
133 /* file was detected release, we need to restore it
134 * before finishing the io
136 rc = ll_layout_restore(ccc_object_inode(obj));
137 /* if restore registration failed, no restart,
138 * we will return -ENODATA */
139 /* The layout will change after restore, so we need to
140 * block on layout lock hold by the MDT
141 * as MDT will not send new layout in lvb (see LU-3124)
142 * we have to explicitly fetch it, all this will be done
143 * by ll_layout_refresh()
146 io->ci_restore_needed = 0;
147 io->ci_need_restart = 1;
148 io->ci_verify_layout = 1;
150 io->ci_restore_needed = 1;
151 io->ci_need_restart = 0;
152 io->ci_verify_layout = 0;
157 if (!io->ci_ignore_layout && io->ci_verify_layout) {
160 /* check layout version */
161 ll_layout_refresh(ccc_object_inode(obj), &gen);
162 io->ci_need_restart = cio->cui_layout_gen != gen;
163 if (io->ci_need_restart) {
165 DFID" layout changed from %d to %d.\n",
166 PFID(lu_object_fid(&obj->co_lu)),
167 cio->cui_layout_gen, gen);
168 /* today successful restore is the only possible
170 /* restore was done, clear restoring state */
171 ll_i2info(ccc_object_inode(obj))->lli_flags &=
172 ~LLIF_FILE_RESTORING;
177 static void vvp_io_fault_fini(const struct lu_env *env,
178 const struct cl_io_slice *ios)
180 struct cl_io *io = ios->cis_io;
181 struct cl_page *page = io->u.ci_fault.ft_page;
183 CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
186 lu_ref_del(&page->cp_reference, "fault", io);
187 cl_page_put(env, page);
188 io->u.ci_fault.ft_page = NULL;
190 vvp_io_fini(env, ios);
193 enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma)
196 * we only want to hold PW locks if the mmap() can generate
197 * writes back to the file and that only happens in shared
200 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
205 static int vvp_mmap_locks(const struct lu_env *env,
206 struct ccc_io *vio, struct cl_io *io)
208 struct ccc_thread_info *cti = ccc_env_info(env);
209 struct mm_struct *mm = current->mm;
210 struct vm_area_struct *vma;
211 struct cl_lock_descr *descr = &cti->cti_descr;
212 ldlm_policy_data_t policy;
218 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
220 if (!cl_is_normalio(env, io))
223 if (vio->cui_iov == NULL) /* nfs or loop back device write */
226 /* No MM (e.g. NFS)? No vmas too. */
230 for (seg = 0; seg < vio->cui_nrsegs; seg++) {
231 const struct iovec *iv = &vio->cui_iov[seg];
233 addr = (unsigned long)iv->iov_base;
238 count += addr & (~CFS_PAGE_MASK);
239 addr &= CFS_PAGE_MASK;
241 down_read(&mm->mmap_sem);
242 while((vma = our_vma(mm, addr, count)) != NULL) {
243 struct inode *inode = vma->vm_file->f_dentry->d_inode;
244 int flags = CEF_MUST;
246 if (ll_file_nolock(vma->vm_file)) {
248 * For no lock case, a lockless lock will be
255 * XXX: Required lock mode can be weakened: CIT_WRITE
256 * io only ever reads user level buffer, and CIT_READ
259 policy_from_vma(&policy, vma, addr, count);
260 descr->cld_mode = vvp_mode_from_vma(vma);
261 descr->cld_obj = ll_i2info(inode)->lli_clob;
262 descr->cld_start = cl_index(descr->cld_obj,
263 policy.l_extent.start);
264 descr->cld_end = cl_index(descr->cld_obj,
265 policy.l_extent.end);
266 descr->cld_enq_flags = flags;
267 result = cl_io_lock_alloc_add(env, io, descr);
269 CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
270 descr->cld_mode, descr->cld_start,
276 if (vma->vm_end - addr >= count)
279 count -= vma->vm_end - addr;
282 up_read(&mm->mmap_sem);
287 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
288 enum cl_lock_mode mode, loff_t start, loff_t end)
290 struct ccc_io *cio = ccc_env_io(env);
294 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
296 ccc_io_update_iov(env, cio, io);
298 if (io->u.ci_rw.crw_nonblock)
299 ast_flags |= CEF_NONBLOCK;
300 result = vvp_mmap_locks(env, cio, io);
302 result = ccc_io_one_lock(env, io, ast_flags, mode, start, end);
306 static int vvp_io_read_lock(const struct lu_env *env,
307 const struct cl_io_slice *ios)
309 struct cl_io *io = ios->cis_io;
310 struct ll_inode_info *lli = ll_i2info(ccc_object_inode(io->ci_obj));
313 /* XXX: Layer violation, we shouldn't see lsm at llite level. */
314 if (lli->lli_has_smd) /* lsm-less file doesn't need to lock */
315 result = vvp_io_rw_lock(env, io, CLM_READ,
316 io->u.ci_rd.rd.crw_pos,
317 io->u.ci_rd.rd.crw_pos +
318 io->u.ci_rd.rd.crw_count - 1);
324 static int vvp_io_fault_lock(const struct lu_env *env,
325 const struct cl_io_slice *ios)
327 struct cl_io *io = ios->cis_io;
328 struct vvp_io *vio = cl2vvp_io(env, ios);
330 * XXX LDLM_FL_CBPENDING
332 return ccc_io_one_lock_index
333 (env, io, 0, vvp_mode_from_vma(vio->u.fault.ft_vma),
334 io->u.ci_fault.ft_index, io->u.ci_fault.ft_index);
337 static int vvp_io_write_lock(const struct lu_env *env,
338 const struct cl_io_slice *ios)
340 struct cl_io *io = ios->cis_io;
344 if (io->u.ci_wr.wr_append) {
346 end = OBD_OBJECT_EOF;
348 start = io->u.ci_wr.wr.crw_pos;
349 end = start + io->u.ci_wr.wr.crw_count - 1;
351 return vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
354 static int vvp_io_setattr_iter_init(const struct lu_env *env,
355 const struct cl_io_slice *ios)
361 * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
363 * Handles "lockless io" mode when extent locking is done by server.
365 static int vvp_io_setattr_lock(const struct lu_env *env,
366 const struct cl_io_slice *ios)
368 struct ccc_io *cio = ccc_env_io(env);
369 struct cl_io *io = ios->cis_io;
373 if (cl_io_is_trunc(io)) {
374 new_size = io->u.ci_setattr.sa_attr.lvb_size;
376 enqflags = CEF_DISCARD_DATA;
378 if ((io->u.ci_setattr.sa_attr.lvb_mtime >=
379 io->u.ci_setattr.sa_attr.lvb_ctime) ||
380 (io->u.ci_setattr.sa_attr.lvb_atime >=
381 io->u.ci_setattr.sa_attr.lvb_ctime))
385 cio->u.setattr.cui_local_lock = SETATTR_EXTENT_LOCK;
386 return ccc_io_one_lock(env, io, enqflags, CLM_WRITE,
387 new_size, OBD_OBJECT_EOF);
390 static int vvp_do_vmtruncate(struct inode *inode, size_t size)
394 * Only ll_inode_size_lock is taken at this level.
396 ll_inode_size_lock(inode);
397 result = inode_newsize_ok(inode, size);
399 ll_inode_size_unlock(inode);
402 truncate_setsize(inode, size);
403 ll_inode_size_unlock(inode);
407 static int vvp_io_setattr_trunc(const struct lu_env *env,
408 const struct cl_io_slice *ios,
409 struct inode *inode, loff_t size)
411 inode_dio_wait(inode);
415 static int vvp_io_setattr_time(const struct lu_env *env,
416 const struct cl_io_slice *ios)
418 struct cl_io *io = ios->cis_io;
419 struct cl_object *obj = io->ci_obj;
420 struct cl_attr *attr = ccc_env_thread_attr(env);
422 unsigned valid = CAT_CTIME;
424 cl_object_attr_lock(obj);
425 attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
426 if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) {
427 attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
430 if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) {
431 attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
434 result = cl_object_attr_set(env, obj, attr, valid);
435 cl_object_attr_unlock(obj);
440 static int vvp_io_setattr_start(const struct lu_env *env,
441 const struct cl_io_slice *ios)
443 struct cl_io *io = ios->cis_io;
444 struct inode *inode = ccc_object_inode(io->ci_obj);
447 mutex_lock(&inode->i_mutex);
448 if (cl_io_is_trunc(io))
449 result = vvp_io_setattr_trunc(env, ios, inode,
450 io->u.ci_setattr.sa_attr.lvb_size);
452 result = vvp_io_setattr_time(env, ios);
456 static void vvp_io_setattr_end(const struct lu_env *env,
457 const struct cl_io_slice *ios)
459 struct cl_io *io = ios->cis_io;
460 struct inode *inode = ccc_object_inode(io->ci_obj);
462 if (cl_io_is_trunc(io)) {
463 /* Truncate in memory pages - they must be clean pages
464 * because osc has already notified to destroy osc_extents. */
465 vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
466 inode_dio_write_done(inode);
468 mutex_unlock(&inode->i_mutex);
471 static void vvp_io_setattr_fini(const struct lu_env *env,
472 const struct cl_io_slice *ios)
474 vvp_io_fini(env, ios);
477 static int vvp_io_read_start(const struct lu_env *env,
478 const struct cl_io_slice *ios)
480 struct vvp_io *vio = cl2vvp_io(env, ios);
481 struct ccc_io *cio = cl2ccc_io(env, ios);
482 struct cl_io *io = ios->cis_io;
483 struct cl_object *obj = io->ci_obj;
484 struct inode *inode = ccc_object_inode(obj);
485 struct ll_ra_read *bead = &vio->cui_bead;
486 struct file *file = cio->cui_fd->fd_file;
489 loff_t pos = io->u.ci_rd.rd.crw_pos;
490 long cnt = io->u.ci_rd.rd.crw_count;
491 long tot = cio->cui_tot_count;
494 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
496 CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
498 if (!can_populate_pages(env, io, inode))
501 result = ccc_prep_size(env, obj, io, pos, tot, &exceed);
504 else if (exceed != 0)
507 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
508 "Read ino %lu, %lu bytes, offset %lld, size %llu\n",
509 inode->i_ino, cnt, pos, i_size_read(inode));
511 /* turn off the kernel's read-ahead */
512 cio->cui_fd->fd_file->f_ra.ra_pages = 0;
514 /* initialize read-ahead window once per syscall */
515 if (!vio->cui_ra_window_set) {
516 vio->cui_ra_window_set = 1;
517 bead->lrr_start = cl_index(obj, pos);
519 * XXX: explicit PAGE_CACHE_SIZE
521 bead->lrr_count = cl_index(obj, tot + PAGE_CACHE_SIZE - 1);
522 ll_ra_read_in(file, bead);
527 switch (vio->cui_io_subtype) {
529 LASSERT(cio->cui_iocb->ki_pos == pos);
530 result = generic_file_aio_read(cio->cui_iocb,
531 cio->cui_iov, cio->cui_nrsegs,
532 cio->cui_iocb->ki_pos);
535 result = generic_file_splice_read(file, &pos,
536 vio->u.splice.cui_pipe, cnt,
537 vio->u.splice.cui_flags);
538 /* LU-1109: do splice read stripe by stripe otherwise if it
539 * may make nfsd stuck if this read occupied all internal pipe
544 CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
552 io->ci_nob += result;
553 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
554 cio->cui_fd, pos, result, READ);
560 static void vvp_io_read_fini(const struct lu_env *env, const struct cl_io_slice *ios)
562 struct vvp_io *vio = cl2vvp_io(env, ios);
563 struct ccc_io *cio = cl2ccc_io(env, ios);
565 if (vio->cui_ra_window_set)
566 ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead);
568 vvp_io_fini(env, ios);
571 static int vvp_io_write_start(const struct lu_env *env,
572 const struct cl_io_slice *ios)
574 struct ccc_io *cio = cl2ccc_io(env, ios);
575 struct cl_io *io = ios->cis_io;
576 struct cl_object *obj = io->ci_obj;
577 struct inode *inode = ccc_object_inode(obj);
579 loff_t pos = io->u.ci_wr.wr.crw_pos;
580 size_t cnt = io->u.ci_wr.wr.crw_count;
582 if (!can_populate_pages(env, io, inode))
585 if (cl_io_is_append(io)) {
587 * PARALLEL IO This has to be changed for parallel IO doing
588 * out-of-order writes.
590 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
591 cio->cui_iocb->ki_pos = pos;
593 LASSERT(cio->cui_iocb->ki_pos == pos);
596 CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
598 if (cio->cui_iov == NULL) /* from a temp io in ll_cl_init(). */
601 result = generic_file_aio_write(cio->cui_iocb,
602 cio->cui_iov, cio->cui_nrsegs,
603 cio->cui_iocb->ki_pos);
607 io->ci_nob += result;
608 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
609 cio->cui_fd, pos, result, WRITE);
615 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
617 struct vm_fault *vmf = cfio->fault.ft_vmf;
619 cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, vmf);
623 "page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n",
624 vmf->page, vmf->page->mapping, vmf->page->index,
625 (long)vmf->page->flags, page_count(vmf->page),
626 page_private(vmf->page), vmf->virtual_address);
627 if (unlikely(!(cfio->fault.ft_flags & VM_FAULT_LOCKED))) {
628 lock_page(vmf->page);
629 cfio->fault.ft_flags &= VM_FAULT_LOCKED;
632 cfio->ft_vmpage = vmf->page;
636 if (cfio->fault.ft_flags & VM_FAULT_SIGBUS) {
637 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address);
641 if (cfio->fault.ft_flags & VM_FAULT_OOM) {
642 CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address);
646 if (cfio->fault.ft_flags & VM_FAULT_RETRY)
649 CERROR("unknow error in page fault %d!\n", cfio->fault.ft_flags);
654 static int vvp_io_fault_start(const struct lu_env *env,
655 const struct cl_io_slice *ios)
657 struct vvp_io *vio = cl2vvp_io(env, ios);
658 struct cl_io *io = ios->cis_io;
659 struct cl_object *obj = io->ci_obj;
660 struct inode *inode = ccc_object_inode(obj);
661 struct cl_fault_io *fio = &io->u.ci_fault;
662 struct vvp_fault_io *cfio = &vio->u.fault;
665 struct page *vmpage = NULL;
666 struct cl_page *page;
668 pgoff_t last; /* last page in a file data region */
670 if (fio->ft_executable &&
671 LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime)
673 " changed while waiting for the page fault lock\n",
674 PFID(lu_object_fid(&obj->co_lu)));
676 /* offset of the last byte on the page */
677 offset = cl_offset(obj, fio->ft_index + 1) - 1;
678 LASSERT(cl_index(obj, offset) == fio->ft_index);
679 result = ccc_prep_size(env, obj, io, 0, offset + 1, NULL);
683 /* must return locked page */
684 if (fio->ft_mkwrite) {
685 LASSERT(cfio->ft_vmpage != NULL);
686 lock_page(cfio->ft_vmpage);
688 result = vvp_io_kernel_fault(cfio);
693 vmpage = cfio->ft_vmpage;
694 LASSERT(PageLocked(vmpage));
696 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
697 ll_invalidate_page(vmpage);
699 size = i_size_read(inode);
700 /* Though we have already held a cl_lock upon this page, but
701 * it still can be truncated locally. */
702 if (unlikely((vmpage->mapping != inode->i_mapping) ||
703 (page_offset(vmpage) > size))) {
704 CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
706 /* return +1 to stop cl_io_loop() and ll_fault() will catch
708 GOTO(out, result = +1);
712 if (fio->ft_mkwrite ) {
715 * Capture the size while holding the lli_trunc_sem from above
716 * we want to make sure that we complete the mkwrite action
717 * while holding this lock. We need to make sure that we are
718 * not past the end of the file.
720 last_index = cl_index(obj, size - 1);
721 if (last_index < fio->ft_index) {
723 "llite: mkwrite and truncate race happened: "
725 vmpage->mapping,fio->ft_index,last_index);
727 * We need to return if we are
728 * passed the end of the file. This will propagate
729 * up the call stack to ll_page_mkwrite where
730 * we will return VM_FAULT_NOPAGE. Any non-negative
731 * value returned here will be silently
732 * converted to 0. If the vmpage->mapping is null
733 * the error code would be converted back to ENODATA
734 * in ll_page_mkwrite0. Thus we return -ENODATA
735 * to handle both cases
737 GOTO(out, result = -ENODATA);
741 page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
743 GOTO(out, result = PTR_ERR(page));
745 /* if page is going to be written, we should add this page into cache
747 if (fio->ft_mkwrite) {
748 wait_on_page_writeback(vmpage);
749 if (set_page_dirty(vmpage)) {
752 /* vvp_page_assume() calls wait_on_page_writeback(). */
753 cl_page_assume(env, io, page);
755 cp = cl2ccc_page(cl_page_at(page, &vvp_device_type));
756 vvp_write_pending(cl2ccc(obj), cp);
758 /* Do not set Dirty bit here so that in case IO is
759 * started before the page is really made dirty, we
760 * still have chance to detect it. */
761 result = cl_page_cache_add(env, io, page, CRT_WRITE);
762 LASSERT(cl_page_is_owned(page, io));
766 cl_page_unmap(env, io, page);
767 cl_page_discard(env, io, page);
768 cl_page_disown(env, io, page);
770 cl_page_put(env, page);
772 /* we're in big trouble, what can we do now? */
773 if (result == -EDQUOT)
777 cl_page_disown(env, io, page);
781 last = cl_index(obj, size - 1);
783 * The ft_index is only used in the case of
784 * a mkwrite action. We need to check
785 * our assertions are correct, since
786 * we should have caught this above
788 LASSERT(!fio->ft_mkwrite || fio->ft_index <= last);
789 if (fio->ft_index == last)
791 * Last page is mapped partially.
793 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
795 fio->ft_nob = cl_page_size(obj);
797 lu_ref_add(&page->cp_reference, "fault", io);
801 /* return unlocked vmpage to avoid deadlocking */
804 cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
808 static int vvp_io_fsync_start(const struct lu_env *env,
809 const struct cl_io_slice *ios)
811 /* we should mark TOWRITE bit to each dirty page in radix tree to
812 * verify pages have been written, but this is difficult because of
817 static int vvp_io_read_page(const struct lu_env *env,
818 const struct cl_io_slice *ios,
819 const struct cl_page_slice *slice)
821 struct cl_io *io = ios->cis_io;
822 struct cl_object *obj = slice->cpl_obj;
823 struct ccc_page *cp = cl2ccc_page(slice);
824 struct cl_page *page = slice->cpl_page;
825 struct inode *inode = ccc_object_inode(obj);
826 struct ll_sb_info *sbi = ll_i2sbi(inode);
827 struct ll_file_data *fd = cl2ccc_io(env, ios)->cui_fd;
828 struct ll_readahead_state *ras = &fd->fd_ras;
829 struct page *vmpage = cp->cpg_page;
830 struct cl_2queue *queue = &io->ci_queue;
833 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
834 LASSERT(slice->cpl_obj == obj);
836 if (sbi->ll_ra_info.ra_max_pages_per_file &&
837 sbi->ll_ra_info.ra_max_pages)
838 ras_update(sbi, inode, ras, page->cp_index,
839 cp->cpg_defer_uptodate);
841 /* Sanity check whether the page is protected by a lock. */
842 rc = cl_page_is_under_lock(env, io, page);
844 CL_PAGE_HEADER(D_WARNING, env, page, "%s: %d\n",
845 rc == -ENODATA ? "without a lock" :
851 if (cp->cpg_defer_uptodate) {
853 cl_page_export(env, page, 1);
856 * Add page into the queue even when it is marked uptodate above.
857 * this will unlock it automatically as part of cl_page_list_disown().
859 cl_2queue_add(queue, page);
860 if (sbi->ll_ra_info.ra_max_pages_per_file &&
861 sbi->ll_ra_info.ra_max_pages)
862 ll_readahead(env, io, ras,
863 vmpage->mapping, &queue->c2_qin, fd->fd_flags);
868 static int vvp_page_sync_io(const struct lu_env *env, struct cl_io *io,
869 struct cl_page *page, struct ccc_page *cp,
870 enum cl_req_type crt)
872 struct cl_2queue *queue;
875 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
877 queue = &io->ci_queue;
878 cl_2queue_init_page(queue, page);
880 result = cl_io_submit_sync(env, io, crt, queue, 0);
881 LASSERT(cl_page_is_owned(page, io));
885 * in CRT_WRITE case page is left locked even in case of
888 cl_page_list_disown(env, io, &queue->c2_qin);
889 cl_2queue_fini(env, queue);
895 * Prepare partially written-to page for a write.
897 static int vvp_io_prepare_partial(const struct lu_env *env, struct cl_io *io,
898 struct cl_object *obj, struct cl_page *pg,
900 unsigned from, unsigned to)
902 struct cl_attr *attr = ccc_env_thread_attr(env);
903 loff_t offset = cl_offset(obj, pg->cp_index);
906 cl_object_attr_lock(obj);
907 result = cl_object_attr_get(env, obj, attr);
908 cl_object_attr_unlock(obj);
911 * If are writing to a new page, no need to read old data.
912 * The extent locking will have updated the KMS, and for our
913 * purposes here we can treat it like i_size.
915 if (attr->cat_kms <= offset) {
916 char *kaddr = kmap_atomic(cp->cpg_page);
918 memset(kaddr, 0, cl_page_size(obj));
919 kunmap_atomic(kaddr);
920 } else if (cp->cpg_defer_uptodate)
923 result = vvp_page_sync_io(env, io, pg, cp, CRT_READ);
925 * In older implementations, obdo_refresh_inode is called here
926 * to update the inode because the write might modify the
927 * object info at OST. However, this has been proven useless,
928 * since LVB functions will be called when user space program
929 * tries to retrieve inode attribute. Also, see bug 15909 for
933 cl_page_export(env, pg, 1);
938 static int vvp_io_prepare_write(const struct lu_env *env,
939 const struct cl_io_slice *ios,
940 const struct cl_page_slice *slice,
941 unsigned from, unsigned to)
943 struct cl_object *obj = slice->cpl_obj;
944 struct ccc_page *cp = cl2ccc_page(slice);
945 struct cl_page *pg = slice->cpl_page;
946 struct page *vmpage = cp->cpg_page;
950 LINVRNT(cl_page_is_vmlocked(env, pg));
951 LASSERT(vmpage->mapping->host == ccc_object_inode(obj));
955 CL_PAGE_HEADER(D_PAGE, env, pg, "preparing: [%d, %d]\n", from, to);
956 if (!PageUptodate(vmpage)) {
958 * We're completely overwriting an existing page, so _don't_
959 * set it up to date until commit_write
961 if (from == 0 && to == PAGE_CACHE_SIZE) {
962 CL_PAGE_HEADER(D_PAGE, env, pg, "full page write\n");
963 POISON_PAGE(page, 0x11);
965 result = vvp_io_prepare_partial(env, ios->cis_io, obj,
968 CL_PAGE_HEADER(D_PAGE, env, pg, "uptodate\n");
972 static int vvp_io_commit_write(const struct lu_env *env,
973 const struct cl_io_slice *ios,
974 const struct cl_page_slice *slice,
975 unsigned from, unsigned to)
977 struct cl_object *obj = slice->cpl_obj;
978 struct cl_io *io = ios->cis_io;
979 struct ccc_page *cp = cl2ccc_page(slice);
980 struct cl_page *pg = slice->cpl_page;
981 struct inode *inode = ccc_object_inode(obj);
982 struct ll_sb_info *sbi = ll_i2sbi(inode);
983 struct ll_inode_info *lli = ll_i2info(inode);
984 struct page *vmpage = cp->cpg_page;
990 LINVRNT(cl_page_is_vmlocked(env, pg));
991 LASSERT(vmpage->mapping->host == inode);
993 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "committing page write\n");
994 CL_PAGE_HEADER(D_PAGE, env, pg, "committing: [%d, %d]\n", from, to);
997 * queue a write for some time in the future the first time we
1000 * This is different from what other file systems do: they usually
1001 * just mark page (and some of its buffers) dirty and rely on
1002 * balance_dirty_pages() to start a write-back. Lustre wants write-back
1003 * to be started earlier for the following reasons:
1005 * (1) with a large number of clients we need to limit the amount
1006 * of cached data on the clients a lot;
1008 * (2) large compute jobs generally want compute-only then io-only
1009 * and the IO should complete as quickly as possible;
1011 * (3) IO is batched up to the RPC size and is async until the
1012 * client max cache is hit
1013 * (/proc/fs/lustre/osc/OSC.../max_dirty_mb)
1016 if (!PageDirty(vmpage)) {
1017 tallyop = LPROC_LL_DIRTY_MISSES;
1018 result = cl_page_cache_add(env, io, pg, CRT_WRITE);
1020 /* page was added into cache successfully. */
1021 set_page_dirty(vmpage);
1022 vvp_write_pending(cl2ccc(obj), cp);
1023 } else if (result == -EDQUOT) {
1024 pgoff_t last_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
1025 bool need_clip = true;
1028 * Client ran out of disk space grant. Possible
1031 * (a) do a sync write, renewing grant;
1033 * (b) stop writing on this stripe, switch to the
1036 * (b) is a part of "parallel io" design that is the
1037 * ultimate goal. (a) is what "old" client did, and
1038 * what the new code continues to do for the time
1041 if (last_index > pg->cp_index) {
1042 to = PAGE_CACHE_SIZE;
1044 } else if (last_index == pg->cp_index) {
1045 int size_to = i_size_read(inode) & ~CFS_PAGE_MASK;
1050 cl_page_clip(env, pg, 0, to);
1051 result = vvp_page_sync_io(env, io, pg, cp, CRT_WRITE);
1053 CERROR("Write page %lu of inode %p failed %d\n",
1054 pg->cp_index, inode, result);
1057 tallyop = LPROC_LL_DIRTY_HITS;
1060 ll_stats_ops_tally(sbi, tallyop, 1);
1062 /* Inode should be marked DIRTY even if no new page was marked DIRTY
1063 * because page could have been not flushed between 2 modifications.
1064 * It is important the file is marked DIRTY as soon as the I/O is done
1065 * Indeed, when cache is flushed, file could be already closed and it
1066 * is too late to warn the MDT.
1067 * It is acceptable that file is marked DIRTY even if I/O is dropped
1068 * for some reasons before being flushed to OST.
1071 spin_lock(&lli->lli_lock);
1072 lli->lli_flags |= LLIF_DATA_MODIFIED;
1073 spin_unlock(&lli->lli_lock);
1076 size = cl_offset(obj, pg->cp_index) + to;
1078 ll_inode_size_lock(inode);
1080 if (size > i_size_read(inode)) {
1081 cl_isize_write_nolock(inode, size);
1082 CDEBUG(D_VFSTRACE, DFID" updating i_size %lu\n",
1083 PFID(lu_object_fid(&obj->co_lu)),
1084 (unsigned long)size);
1086 cl_page_export(env, pg, 1);
1088 if (size > i_size_read(inode))
1089 cl_page_discard(env, io, pg);
1091 ll_inode_size_unlock(inode);
1095 static const struct cl_io_operations vvp_io_ops = {
1098 .cio_fini = vvp_io_read_fini,
1099 .cio_lock = vvp_io_read_lock,
1100 .cio_start = vvp_io_read_start,
1101 .cio_advance = ccc_io_advance
1104 .cio_fini = vvp_io_fini,
1105 .cio_lock = vvp_io_write_lock,
1106 .cio_start = vvp_io_write_start,
1107 .cio_advance = ccc_io_advance
1110 .cio_fini = vvp_io_setattr_fini,
1111 .cio_iter_init = vvp_io_setattr_iter_init,
1112 .cio_lock = vvp_io_setattr_lock,
1113 .cio_start = vvp_io_setattr_start,
1114 .cio_end = vvp_io_setattr_end
1117 .cio_fini = vvp_io_fault_fini,
1118 .cio_iter_init = vvp_io_fault_iter_init,
1119 .cio_lock = vvp_io_fault_lock,
1120 .cio_start = vvp_io_fault_start,
1121 .cio_end = ccc_io_end
1124 .cio_start = vvp_io_fsync_start,
1125 .cio_fini = vvp_io_fini
1128 .cio_fini = vvp_io_fini
1131 .cio_read_page = vvp_io_read_page,
1132 .cio_prepare_write = vvp_io_prepare_write,
1133 .cio_commit_write = vvp_io_commit_write
1136 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
1139 struct vvp_io *vio = vvp_env_io(env);
1140 struct ccc_io *cio = ccc_env_io(env);
1141 struct inode *inode = ccc_object_inode(obj);
1144 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
1146 CDEBUG(D_VFSTRACE, DFID
1147 " ignore/verify layout %d/%d, layout version %d restore needed %d\n",
1148 PFID(lu_object_fid(&obj->co_lu)),
1149 io->ci_ignore_layout, io->ci_verify_layout,
1150 cio->cui_layout_gen, io->ci_restore_needed);
1152 CL_IO_SLICE_CLEAN(cio, cui_cl);
1153 cl_io_slice_add(io, &cio->cui_cl, obj, &vvp_io_ops);
1154 vio->cui_ra_window_set = 0;
1156 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
1158 struct ll_inode_info *lli = ll_i2info(inode);
1160 count = io->u.ci_rw.crw_count;
1161 /* "If nbyte is 0, read() will return 0 and have no other
1162 * results." -- Single Unix Spec */
1166 cio->cui_tot_count = count;
1167 cio->cui_tot_nrsegs = 0;
1169 /* for read/write, we store the jobid in the inode, and
1170 * it'll be fetched by osc when building RPC.
1172 * it's not accurate if the file is shared by different
1175 lustre_get_jobid(lli->lli_jobid);
1176 } else if (io->ci_type == CIT_SETATTR) {
1177 if (!cl_io_is_trunc(io))
1178 io->ci_lockreq = CILR_MANDATORY;
1181 /* ignore layout change for generic CIT_MISC but not for glimpse.
1182 * io context for glimpse must set ci_verify_layout to true,
1183 * see cl_glimpse_size0() for details. */
1184 if (io->ci_type == CIT_MISC && !io->ci_verify_layout)
1185 io->ci_ignore_layout = 1;
1187 /* Enqueue layout lock and get layout version. We need to do this
1188 * even for operations requiring to open file, such as read and write,
1189 * because it might not grant layout lock in IT_OPEN. */
1190 if (result == 0 && !io->ci_ignore_layout) {
1191 result = ll_layout_refresh(inode, &cio->cui_layout_gen);
1192 if (result == -ENOENT)
1193 /* If the inode on MDS has been removed, but the objects
1194 * on OSTs haven't been destroyed (async unlink), layout
1195 * fetch will return -ENOENT, we'd ingore this error
1196 * and continue with dirty flush. LU-3230. */
1199 CERROR("%s: refresh file layout " DFID " error %d.\n",
1200 ll_get_fsname(inode->i_sb, NULL, 0),
1201 PFID(lu_object_fid(&obj->co_lu)), result);
1207 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
1208 const struct cl_io_slice *slice)
1210 /* Caling just for assertion */
1211 cl2ccc_io(env, slice);
1212 return vvp_env_io(env);