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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
45 #include "../include/obd.h"
46 #include "../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 (ll_layout_version_get(lli) != 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 file_inode(cl2ccc_io(env, ios)->cui_fd->fd_file));
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 static 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;
219 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
221 if (!cl_is_normalio(env, io))
224 if (vio->cui_iter == NULL) /* nfs or loop back device write */
227 /* No MM (e.g. NFS)? No vmas too. */
231 iov_for_each(iov, i, *(vio->cui_iter)) {
232 addr = (unsigned long)iov.iov_base;
237 count += addr & (~CFS_PAGE_MASK);
238 addr &= CFS_PAGE_MASK;
240 down_read(&mm->mmap_sem);
241 while ((vma = our_vma(mm, addr, count)) != NULL) {
242 struct inode *inode = file_inode(vma->vm_file);
243 int flags = CEF_MUST;
245 if (ll_file_nolock(vma->vm_file)) {
247 * For no lock case, a lockless lock will be
254 * XXX: Required lock mode can be weakened: CIT_WRITE
255 * io only ever reads user level buffer, and CIT_READ
258 policy_from_vma(&policy, vma, addr, count);
259 descr->cld_mode = vvp_mode_from_vma(vma);
260 descr->cld_obj = ll_i2info(inode)->lli_clob;
261 descr->cld_start = cl_index(descr->cld_obj,
262 policy.l_extent.start);
263 descr->cld_end = cl_index(descr->cld_obj,
264 policy.l_extent.end);
265 descr->cld_enq_flags = flags;
266 result = cl_io_lock_alloc_add(env, io, descr);
268 CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n",
269 descr->cld_mode, descr->cld_start,
273 up_read(&mm->mmap_sem);
277 if (vma->vm_end - addr >= count)
280 count -= vma->vm_end - addr;
283 up_read(&mm->mmap_sem);
288 static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io,
289 enum cl_lock_mode mode, loff_t start, loff_t end)
291 struct ccc_io *cio = ccc_env_io(env);
295 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
297 ccc_io_update_iov(env, cio, io);
299 if (io->u.ci_rw.crw_nonblock)
300 ast_flags |= CEF_NONBLOCK;
301 result = vvp_mmap_locks(env, cio, io);
303 result = ccc_io_one_lock(env, io, ast_flags, mode, start, end);
307 static int vvp_io_read_lock(const struct lu_env *env,
308 const struct cl_io_slice *ios)
310 struct cl_io *io = ios->cis_io;
311 struct ll_inode_info *lli = ll_i2info(ccc_object_inode(io->ci_obj));
314 /* XXX: Layer violation, we shouldn't see lsm at llite level. */
315 if (lli->lli_has_smd) /* lsm-less file doesn't need to lock */
316 result = vvp_io_rw_lock(env, io, CLM_READ,
317 io->u.ci_rd.rd.crw_pos,
318 io->u.ci_rd.rd.crw_pos +
319 io->u.ci_rd.rd.crw_count - 1);
325 static int vvp_io_fault_lock(const struct lu_env *env,
326 const struct cl_io_slice *ios)
328 struct cl_io *io = ios->cis_io;
329 struct vvp_io *vio = cl2vvp_io(env, ios);
331 * XXX LDLM_FL_CBPENDING
333 return ccc_io_one_lock_index
334 (env, io, 0, vvp_mode_from_vma(vio->u.fault.ft_vma),
335 io->u.ci_fault.ft_index, io->u.ci_fault.ft_index);
338 static int vvp_io_write_lock(const struct lu_env *env,
339 const struct cl_io_slice *ios)
341 struct cl_io *io = ios->cis_io;
345 if (io->u.ci_wr.wr_append) {
347 end = OBD_OBJECT_EOF;
349 start = io->u.ci_wr.wr.crw_pos;
350 end = start + io->u.ci_wr.wr.crw_count - 1;
352 return vvp_io_rw_lock(env, io, CLM_WRITE, start, end);
355 static int vvp_io_setattr_iter_init(const struct lu_env *env,
356 const struct cl_io_slice *ios)
362 * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io.
364 * Handles "lockless io" mode when extent locking is done by server.
366 static int vvp_io_setattr_lock(const struct lu_env *env,
367 const struct cl_io_slice *ios)
369 struct ccc_io *cio = ccc_env_io(env);
370 struct cl_io *io = ios->cis_io;
374 if (cl_io_is_trunc(io)) {
375 new_size = io->u.ci_setattr.sa_attr.lvb_size;
377 enqflags = CEF_DISCARD_DATA;
379 if ((io->u.ci_setattr.sa_attr.lvb_mtime >=
380 io->u.ci_setattr.sa_attr.lvb_ctime) ||
381 (io->u.ci_setattr.sa_attr.lvb_atime >=
382 io->u.ci_setattr.sa_attr.lvb_ctime))
386 cio->u.setattr.cui_local_lock = SETATTR_EXTENT_LOCK;
387 return ccc_io_one_lock(env, io, enqflags, CLM_WRITE,
388 new_size, OBD_OBJECT_EOF);
391 static int vvp_do_vmtruncate(struct inode *inode, size_t size)
395 * Only ll_inode_size_lock is taken at this level.
397 ll_inode_size_lock(inode);
398 result = inode_newsize_ok(inode, size);
400 ll_inode_size_unlock(inode);
403 truncate_setsize(inode, size);
404 ll_inode_size_unlock(inode);
408 static int vvp_io_setattr_trunc(const struct lu_env *env,
409 const struct cl_io_slice *ios,
410 struct inode *inode, loff_t size)
412 inode_dio_wait(inode);
416 static int vvp_io_setattr_time(const struct lu_env *env,
417 const struct cl_io_slice *ios)
419 struct cl_io *io = ios->cis_io;
420 struct cl_object *obj = io->ci_obj;
421 struct cl_attr *attr = ccc_env_thread_attr(env);
423 unsigned valid = CAT_CTIME;
425 cl_object_attr_lock(obj);
426 attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime;
427 if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) {
428 attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime;
431 if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) {
432 attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime;
435 result = cl_object_attr_set(env, obj, attr, valid);
436 cl_object_attr_unlock(obj);
441 static int vvp_io_setattr_start(const struct lu_env *env,
442 const struct cl_io_slice *ios)
444 struct cl_io *io = ios->cis_io;
445 struct inode *inode = ccc_object_inode(io->ci_obj);
448 mutex_lock(&inode->i_mutex);
449 if (cl_io_is_trunc(io))
450 result = vvp_io_setattr_trunc(env, ios, inode,
451 io->u.ci_setattr.sa_attr.lvb_size);
453 result = vvp_io_setattr_time(env, ios);
457 static void vvp_io_setattr_end(const struct lu_env *env,
458 const struct cl_io_slice *ios)
460 struct cl_io *io = ios->cis_io;
461 struct inode *inode = ccc_object_inode(io->ci_obj);
463 if (cl_io_is_trunc(io)) {
464 /* Truncate in memory pages - they must be clean pages
465 * because osc has already notified to destroy osc_extents. */
466 vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size);
467 inode_dio_write_done(inode);
469 mutex_unlock(&inode->i_mutex);
472 static void vvp_io_setattr_fini(const struct lu_env *env,
473 const struct cl_io_slice *ios)
475 vvp_io_fini(env, ios);
478 static int vvp_io_read_start(const struct lu_env *env,
479 const struct cl_io_slice *ios)
481 struct vvp_io *vio = cl2vvp_io(env, ios);
482 struct ccc_io *cio = cl2ccc_io(env, ios);
483 struct cl_io *io = ios->cis_io;
484 struct cl_object *obj = io->ci_obj;
485 struct inode *inode = ccc_object_inode(obj);
486 struct ll_ra_read *bead = &vio->cui_bead;
487 struct file *file = cio->cui_fd->fd_file;
490 loff_t pos = io->u.ci_rd.rd.crw_pos;
491 long cnt = io->u.ci_rd.rd.crw_count;
492 long tot = cio->cui_tot_count;
495 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
497 CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt);
499 if (!can_populate_pages(env, io, inode))
502 result = ccc_prep_size(env, obj, io, pos, tot, &exceed);
505 else if (exceed != 0)
508 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu,
509 "Read ino %lu, %lu bytes, offset %lld, size %llu\n",
510 inode->i_ino, cnt, pos, i_size_read(inode));
512 /* turn off the kernel's read-ahead */
513 cio->cui_fd->fd_file->f_ra.ra_pages = 0;
515 /* initialize read-ahead window once per syscall */
516 if (!vio->cui_ra_window_set) {
517 vio->cui_ra_window_set = 1;
518 bead->lrr_start = cl_index(obj, pos);
520 * XXX: explicit PAGE_CACHE_SIZE
522 bead->lrr_count = cl_index(obj, tot + PAGE_CACHE_SIZE - 1);
523 ll_ra_read_in(file, bead);
528 switch (vio->cui_io_subtype) {
530 LASSERT(cio->cui_iocb->ki_pos == pos);
531 result = generic_file_read_iter(cio->cui_iocb, cio->cui_iter);
534 result = generic_file_splice_read(file, &pos,
535 vio->u.splice.cui_pipe, cnt,
536 vio->u.splice.cui_flags);
537 /* LU-1109: do splice read stripe by stripe otherwise if it
538 * may make nfsd stuck if this read occupied all internal pipe
543 CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
551 io->ci_nob += result;
552 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
553 cio->cui_fd, pos, result, READ);
559 static void vvp_io_read_fini(const struct lu_env *env, const struct cl_io_slice *ios)
561 struct vvp_io *vio = cl2vvp_io(env, ios);
562 struct ccc_io *cio = cl2ccc_io(env, ios);
564 if (vio->cui_ra_window_set)
565 ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead);
567 vvp_io_fini(env, ios);
570 static int vvp_io_write_start(const struct lu_env *env,
571 const struct cl_io_slice *ios)
573 struct ccc_io *cio = cl2ccc_io(env, ios);
574 struct cl_io *io = ios->cis_io;
575 struct cl_object *obj = io->ci_obj;
576 struct inode *inode = ccc_object_inode(obj);
578 loff_t pos = io->u.ci_wr.wr.crw_pos;
579 size_t cnt = io->u.ci_wr.wr.crw_count;
581 if (!can_populate_pages(env, io, inode))
584 if (cl_io_is_append(io)) {
586 * PARALLEL IO This has to be changed for parallel IO doing
587 * out-of-order writes.
589 pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode);
590 cio->cui_iocb->ki_pos = pos;
592 LASSERT(cio->cui_iocb->ki_pos == pos);
595 CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt);
597 if (cio->cui_iter == NULL) /* from a temp io in ll_cl_init(). */
600 result = generic_file_write_iter(cio->cui_iocb, cio->cui_iter);
605 io->ci_nob += result;
606 ll_rw_stats_tally(ll_i2sbi(inode), current->pid,
607 cio->cui_fd, pos, result, WRITE);
613 static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
615 struct vm_fault *vmf = cfio->fault.ft_vmf;
617 cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, vmf);
618 cfio->fault.ft_flags_valid = 1;
622 "page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n",
623 vmf->page, vmf->page->mapping, vmf->page->index,
624 (long)vmf->page->flags, page_count(vmf->page),
625 page_private(vmf->page), vmf->virtual_address);
626 if (unlikely(!(cfio->fault.ft_flags & VM_FAULT_LOCKED))) {
627 lock_page(vmf->page);
628 cfio->fault.ft_flags |= VM_FAULT_LOCKED;
631 cfio->ft_vmpage = vmf->page;
635 if (cfio->fault.ft_flags & VM_FAULT_SIGBUS) {
636 CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address);
640 if (cfio->fault.ft_flags & VM_FAULT_OOM) {
641 CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address);
645 if (cfio->fault.ft_flags & VM_FAULT_RETRY)
648 CERROR("Unknown error in page fault %d!\n", cfio->fault.ft_flags);
653 static int vvp_io_fault_start(const struct lu_env *env,
654 const struct cl_io_slice *ios)
656 struct vvp_io *vio = cl2vvp_io(env, ios);
657 struct cl_io *io = ios->cis_io;
658 struct cl_object *obj = io->ci_obj;
659 struct inode *inode = ccc_object_inode(obj);
660 struct cl_fault_io *fio = &io->u.ci_fault;
661 struct vvp_fault_io *cfio = &vio->u.fault;
664 struct page *vmpage = NULL;
665 struct cl_page *page;
667 pgoff_t last; /* last page in a file data region */
669 if (fio->ft_executable &&
670 LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime)
672 " changed while waiting for the page fault lock\n",
673 PFID(lu_object_fid(&obj->co_lu)));
675 /* offset of the last byte on the page */
676 offset = cl_offset(obj, fio->ft_index + 1) - 1;
677 LASSERT(cl_index(obj, offset) == fio->ft_index);
678 result = ccc_prep_size(env, obj, io, 0, offset + 1, NULL);
682 /* must return locked page */
683 if (fio->ft_mkwrite) {
684 LASSERT(cfio->ft_vmpage != NULL);
685 lock_page(cfio->ft_vmpage);
687 result = vvp_io_kernel_fault(cfio);
692 vmpage = cfio->ft_vmpage;
693 LASSERT(PageLocked(vmpage));
695 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
696 ll_invalidate_page(vmpage);
698 size = i_size_read(inode);
699 /* Though we have already held a cl_lock upon this page, but
700 * it still can be truncated locally. */
701 if (unlikely((vmpage->mapping != inode->i_mapping) ||
702 (page_offset(vmpage) > size))) {
703 CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n");
705 /* return +1 to stop cl_io_loop() and ll_fault() will catch
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: %p: 0x%lx 0x%lx\n",
724 vmpage->mapping, fio->ft_index, last_index);
726 * We need to return if we are
727 * passed the end of the file. This will propagate
728 * up the call stack to ll_page_mkwrite where
729 * we will return VM_FAULT_NOPAGE. Any non-negative
730 * value returned here will be silently
731 * converted to 0. If the vmpage->mapping is null
732 * the error code would be converted back to ENODATA
733 * in ll_page_mkwrite0. Thus we return -ENODATA
734 * to handle both cases
741 page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE);
743 result = PTR_ERR(page);
747 /* if page is going to be written, we should add this page into cache
749 if (fio->ft_mkwrite) {
750 wait_on_page_writeback(vmpage);
751 if (set_page_dirty(vmpage)) {
754 /* vvp_page_assume() calls wait_on_page_writeback(). */
755 cl_page_assume(env, io, page);
757 cp = cl2ccc_page(cl_page_at(page, &vvp_device_type));
758 vvp_write_pending(cl2ccc(obj), cp);
760 /* Do not set Dirty bit here so that in case IO is
761 * started before the page is really made dirty, we
762 * still have chance to detect it. */
763 result = cl_page_cache_add(env, io, page, CRT_WRITE);
764 LASSERT(cl_page_is_owned(page, io));
768 cl_page_unmap(env, io, page);
769 cl_page_discard(env, io, page);
770 cl_page_disown(env, io, page);
772 cl_page_put(env, page);
774 /* we're in big trouble, what can we do now? */
775 if (result == -EDQUOT)
779 cl_page_disown(env, io, page);
783 last = cl_index(obj, size - 1);
785 * The ft_index is only used in the case of
786 * a mkwrite action. We need to check
787 * our assertions are correct, since
788 * we should have caught this above
790 LASSERT(!fio->ft_mkwrite || fio->ft_index <= last);
791 if (fio->ft_index == last)
793 * Last page is mapped partially.
795 fio->ft_nob = size - cl_offset(obj, fio->ft_index);
797 fio->ft_nob = cl_page_size(obj);
799 lu_ref_add(&page->cp_reference, "fault", io);
803 /* return unlocked vmpage to avoid deadlocking */
806 cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
810 static int vvp_io_fsync_start(const struct lu_env *env,
811 const struct cl_io_slice *ios)
813 /* we should mark TOWRITE bit to each dirty page in radix tree to
814 * verify pages have been written, but this is difficult because of
819 static int vvp_io_read_page(const struct lu_env *env,
820 const struct cl_io_slice *ios,
821 const struct cl_page_slice *slice)
823 struct cl_io *io = ios->cis_io;
824 struct cl_object *obj = slice->cpl_obj;
825 struct ccc_page *cp = cl2ccc_page(slice);
826 struct cl_page *page = slice->cpl_page;
827 struct inode *inode = ccc_object_inode(obj);
828 struct ll_sb_info *sbi = ll_i2sbi(inode);
829 struct ll_file_data *fd = cl2ccc_io(env, ios)->cui_fd;
830 struct ll_readahead_state *ras = &fd->fd_ras;
831 struct page *vmpage = cp->cpg_page;
832 struct cl_2queue *queue = &io->ci_queue;
835 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
836 LASSERT(slice->cpl_obj == obj);
838 if (sbi->ll_ra_info.ra_max_pages_per_file &&
839 sbi->ll_ra_info.ra_max_pages)
840 ras_update(sbi, inode, ras, page->cp_index,
841 cp->cpg_defer_uptodate);
843 /* Sanity check whether the page is protected by a lock. */
844 rc = cl_page_is_under_lock(env, io, page);
846 CL_PAGE_HEADER(D_WARNING, env, page, "%s: %d\n",
847 rc == -ENODATA ? "without a lock" :
853 if (cp->cpg_defer_uptodate) {
855 cl_page_export(env, page, 1);
858 * Add page into the queue even when it is marked uptodate above.
859 * this will unlock it automatically as part of cl_page_list_disown().
861 cl_2queue_add(queue, page);
862 if (sbi->ll_ra_info.ra_max_pages_per_file &&
863 sbi->ll_ra_info.ra_max_pages)
864 ll_readahead(env, io, ras,
865 vmpage->mapping, &queue->c2_qin, fd->fd_flags);
870 static int vvp_page_sync_io(const struct lu_env *env, struct cl_io *io,
871 struct cl_page *page, struct ccc_page *cp,
872 enum cl_req_type crt)
874 struct cl_2queue *queue;
877 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
879 queue = &io->ci_queue;
880 cl_2queue_init_page(queue, page);
882 result = cl_io_submit_sync(env, io, crt, queue, 0);
883 LASSERT(cl_page_is_owned(page, io));
887 * in CRT_WRITE case page is left locked even in case of
890 cl_page_list_disown(env, io, &queue->c2_qin);
891 cl_2queue_fini(env, queue);
897 * Prepare partially written-to page for a write.
899 static int vvp_io_prepare_partial(const struct lu_env *env, struct cl_io *io,
900 struct cl_object *obj, struct cl_page *pg,
902 unsigned from, unsigned to)
904 struct cl_attr *attr = ccc_env_thread_attr(env);
905 loff_t offset = cl_offset(obj, pg->cp_index);
908 cl_object_attr_lock(obj);
909 result = cl_object_attr_get(env, obj, attr);
910 cl_object_attr_unlock(obj);
913 * If are writing to a new page, no need to read old data.
914 * The extent locking will have updated the KMS, and for our
915 * purposes here we can treat it like i_size.
917 if (attr->cat_kms <= offset) {
918 char *kaddr = kmap_atomic(cp->cpg_page);
920 memset(kaddr, 0, cl_page_size(obj));
921 kunmap_atomic(kaddr);
922 } else if (cp->cpg_defer_uptodate)
925 result = vvp_page_sync_io(env, io, pg, cp, CRT_READ);
927 * In older implementations, obdo_refresh_inode is called here
928 * to update the inode because the write might modify the
929 * object info at OST. However, this has been proven useless,
930 * since LVB functions will be called when user space program
931 * tries to retrieve inode attribute. Also, see bug 15909 for
935 cl_page_export(env, pg, 1);
940 static int vvp_io_prepare_write(const struct lu_env *env,
941 const struct cl_io_slice *ios,
942 const struct cl_page_slice *slice,
943 unsigned from, unsigned to)
945 struct cl_object *obj = slice->cpl_obj;
946 struct ccc_page *cp = cl2ccc_page(slice);
947 struct cl_page *pg = slice->cpl_page;
948 struct page *vmpage = cp->cpg_page;
952 LINVRNT(cl_page_is_vmlocked(env, pg));
953 LASSERT(vmpage->mapping->host == ccc_object_inode(obj));
957 CL_PAGE_HEADER(D_PAGE, env, pg, "preparing: [%d, %d]\n", from, to);
958 if (!PageUptodate(vmpage)) {
960 * We're completely overwriting an existing page, so _don't_
961 * set it up to date until commit_write
963 if (from == 0 && to == PAGE_CACHE_SIZE) {
964 CL_PAGE_HEADER(D_PAGE, env, pg, "full page write\n");
965 POISON_PAGE(page, 0x11);
967 result = vvp_io_prepare_partial(env, ios->cis_io, obj,
970 CL_PAGE_HEADER(D_PAGE, env, pg, "uptodate\n");
974 static int vvp_io_commit_write(const struct lu_env *env,
975 const struct cl_io_slice *ios,
976 const struct cl_page_slice *slice,
977 unsigned from, unsigned to)
979 struct cl_object *obj = slice->cpl_obj;
980 struct cl_io *io = ios->cis_io;
981 struct ccc_page *cp = cl2ccc_page(slice);
982 struct cl_page *pg = slice->cpl_page;
983 struct inode *inode = ccc_object_inode(obj);
984 struct ll_sb_info *sbi = ll_i2sbi(inode);
985 struct ll_inode_info *lli = ll_i2info(inode);
986 struct page *vmpage = cp->cpg_page;
992 LINVRNT(cl_page_is_vmlocked(env, pg));
993 LASSERT(vmpage->mapping->host == inode);
995 LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "committing page write\n");
996 CL_PAGE_HEADER(D_PAGE, env, pg, "committing: [%d, %d]\n", from, to);
999 * queue a write for some time in the future the first time we
1002 * This is different from what other file systems do: they usually
1003 * just mark page (and some of its buffers) dirty and rely on
1004 * balance_dirty_pages() to start a write-back. Lustre wants write-back
1005 * to be started earlier for the following reasons:
1007 * (1) with a large number of clients we need to limit the amount
1008 * of cached data on the clients a lot;
1010 * (2) large compute jobs generally want compute-only then io-only
1011 * and the IO should complete as quickly as possible;
1013 * (3) IO is batched up to the RPC size and is async until the
1014 * client max cache is hit
1015 * (/proc/fs/lustre/osc/OSC.../max_dirty_mb)
1018 if (!PageDirty(vmpage)) {
1019 tallyop = LPROC_LL_DIRTY_MISSES;
1020 result = cl_page_cache_add(env, io, pg, CRT_WRITE);
1022 /* page was added into cache successfully. */
1023 set_page_dirty(vmpage);
1024 vvp_write_pending(cl2ccc(obj), cp);
1025 } else if (result == -EDQUOT) {
1026 pgoff_t last_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
1027 bool need_clip = true;
1030 * Client ran out of disk space grant. Possible
1033 * (a) do a sync write, renewing grant;
1035 * (b) stop writing on this stripe, switch to the
1038 * (b) is a part of "parallel io" design that is the
1039 * ultimate goal. (a) is what "old" client did, and
1040 * what the new code continues to do for the time
1043 if (last_index > pg->cp_index) {
1044 to = PAGE_CACHE_SIZE;
1046 } else if (last_index == pg->cp_index) {
1047 int size_to = i_size_read(inode) & ~CFS_PAGE_MASK;
1052 cl_page_clip(env, pg, 0, to);
1053 result = vvp_page_sync_io(env, io, pg, cp, CRT_WRITE);
1055 CERROR("Write page %lu of inode %p failed %d\n",
1056 pg->cp_index, inode, result);
1059 tallyop = LPROC_LL_DIRTY_HITS;
1062 ll_stats_ops_tally(sbi, tallyop, 1);
1064 /* Inode should be marked DIRTY even if no new page was marked DIRTY
1065 * because page could have been not flushed between 2 modifications.
1066 * It is important the file is marked DIRTY as soon as the I/O is done
1067 * Indeed, when cache is flushed, file could be already closed and it
1068 * is too late to warn the MDT.
1069 * It is acceptable that file is marked DIRTY even if I/O is dropped
1070 * for some reasons before being flushed to OST.
1073 spin_lock(&lli->lli_lock);
1074 lli->lli_flags |= LLIF_DATA_MODIFIED;
1075 spin_unlock(&lli->lli_lock);
1078 size = cl_offset(obj, pg->cp_index) + to;
1080 ll_inode_size_lock(inode);
1082 if (size > i_size_read(inode)) {
1083 cl_isize_write_nolock(inode, size);
1084 CDEBUG(D_VFSTRACE, DFID" updating i_size %lu\n",
1085 PFID(lu_object_fid(&obj->co_lu)),
1086 (unsigned long)size);
1088 cl_page_export(env, pg, 1);
1090 if (size > i_size_read(inode))
1091 cl_page_discard(env, io, pg);
1093 ll_inode_size_unlock(inode);
1097 static const struct cl_io_operations vvp_io_ops = {
1100 .cio_fini = vvp_io_read_fini,
1101 .cio_lock = vvp_io_read_lock,
1102 .cio_start = vvp_io_read_start,
1103 .cio_advance = ccc_io_advance
1106 .cio_fini = vvp_io_fini,
1107 .cio_lock = vvp_io_write_lock,
1108 .cio_start = vvp_io_write_start,
1109 .cio_advance = ccc_io_advance
1112 .cio_fini = vvp_io_setattr_fini,
1113 .cio_iter_init = vvp_io_setattr_iter_init,
1114 .cio_lock = vvp_io_setattr_lock,
1115 .cio_start = vvp_io_setattr_start,
1116 .cio_end = vvp_io_setattr_end
1119 .cio_fini = vvp_io_fault_fini,
1120 .cio_iter_init = vvp_io_fault_iter_init,
1121 .cio_lock = vvp_io_fault_lock,
1122 .cio_start = vvp_io_fault_start,
1123 .cio_end = ccc_io_end
1126 .cio_start = vvp_io_fsync_start,
1127 .cio_fini = vvp_io_fini
1130 .cio_fini = vvp_io_fini
1133 .cio_read_page = vvp_io_read_page,
1134 .cio_prepare_write = vvp_io_prepare_write,
1135 .cio_commit_write = vvp_io_commit_write
1138 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
1141 struct vvp_io *vio = vvp_env_io(env);
1142 struct ccc_io *cio = ccc_env_io(env);
1143 struct inode *inode = ccc_object_inode(obj);
1146 CLOBINVRNT(env, obj, ccc_object_invariant(obj));
1148 CDEBUG(D_VFSTRACE, DFID
1149 " ignore/verify layout %d/%d, layout version %d restore needed %d\n",
1150 PFID(lu_object_fid(&obj->co_lu)),
1151 io->ci_ignore_layout, io->ci_verify_layout,
1152 cio->cui_layout_gen, io->ci_restore_needed);
1154 CL_IO_SLICE_CLEAN(cio, cui_cl);
1155 cl_io_slice_add(io, &cio->cui_cl, obj, &vvp_io_ops);
1156 vio->cui_ra_window_set = 0;
1158 if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) {
1160 struct ll_inode_info *lli = ll_i2info(inode);
1162 count = io->u.ci_rw.crw_count;
1163 /* "If nbyte is 0, read() will return 0 and have no other
1164 * results." -- Single Unix Spec */
1168 cio->cui_tot_count = count;
1170 /* for read/write, we store the jobid in the inode, and
1171 * it'll be fetched by osc when building RPC.
1173 * it's not accurate if the file is shared by different
1176 lustre_get_jobid(lli->lli_jobid);
1177 } else if (io->ci_type == CIT_SETATTR) {
1178 if (!cl_io_is_trunc(io))
1179 io->ci_lockreq = CILR_MANDATORY;
1182 /* ignore layout change for generic CIT_MISC but not for glimpse.
1183 * io context for glimpse must set ci_verify_layout to true,
1184 * see cl_glimpse_size0() for details. */
1185 if (io->ci_type == CIT_MISC && !io->ci_verify_layout)
1186 io->ci_ignore_layout = 1;
1188 /* Enqueue layout lock and get layout version. We need to do this
1189 * even for operations requiring to open file, such as read and write,
1190 * because it might not grant layout lock in IT_OPEN. */
1191 if (result == 0 && !io->ci_ignore_layout) {
1192 result = ll_layout_refresh(inode, &cio->cui_layout_gen);
1193 if (result == -ENOENT)
1194 /* If the inode on MDS has been removed, but the objects
1195 * on OSTs haven't been destroyed (async unlink), layout
1196 * fetch will return -ENOENT, we'd ignore this error
1197 * and continue with dirty flush. LU-3230. */
1200 CERROR("%s: refresh file layout " DFID " error %d.\n",
1201 ll_get_fsname(inode->i_sb, NULL, 0),
1202 PFID(lu_object_fid(&obj->co_lu)), result);
1208 static struct vvp_io *cl2vvp_io(const struct lu_env *env,
1209 const struct cl_io_slice *slice)
1211 /* Calling just for assertion */
1212 cl2ccc_io(env, slice);
1213 return vvp_env_io(env);