4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_io for VVP layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_LLITE
40 #include "../include/obd.h"
42 #include "llite_internal.h"
43 #include "vvp_internal.h"
45 static struct vvp_io
*cl2vvp_io(const struct lu_env
*env
,
46 const struct cl_io_slice
*slice
)
50 vio
= container_of(slice
, struct vvp_io
, vui_cl
);
51 LASSERT(vio
== vvp_env_io(env
));
57 * For swapping layout. The file's layout may have changed.
58 * To avoid populating pages to a wrong stripe, we have to verify the
59 * correctness of layout. It works because swapping layout processes
60 * have to acquire group lock.
62 static bool can_populate_pages(const struct lu_env
*env
, struct cl_io
*io
,
65 struct ll_inode_info
*lli
= ll_i2info(inode
);
66 struct vvp_io
*vio
= vvp_env_io(env
);
69 switch (io
->ci_type
) {
72 /* don't need lock here to check lli_layout_gen as we have held
73 * extent lock and GROUP lock has to hold to swap layout
75 if (ll_layout_version_get(lli
) != vio
->vui_layout_gen
||
76 OBD_FAIL_CHECK_RESET(OBD_FAIL_LLITE_LOST_LAYOUT
, 0)) {
77 io
->ci_need_restart
= 1;
78 /* this will cause a short read/write */
83 /* fault is okay because we've already had a page. */
91 static void vvp_object_size_lock(struct cl_object
*obj
)
93 struct inode
*inode
= vvp_object_inode(obj
);
95 ll_inode_size_lock(inode
);
96 cl_object_attr_lock(obj
);
99 static void vvp_object_size_unlock(struct cl_object
*obj
)
101 struct inode
*inode
= vvp_object_inode(obj
);
103 cl_object_attr_unlock(obj
);
104 ll_inode_size_unlock(inode
);
108 * Helper function that if necessary adjusts file size (inode->i_size), when
109 * position at the offset \a pos is accessed. File size can be arbitrary stale
110 * on a Lustre client, but client at least knows KMS. If accessed area is
111 * inside [0, KMS], set file size to KMS, otherwise glimpse file size.
113 * Locking: cl_isize_lock is used to serialize changes to inode size and to
114 * protect consistency between inode size and cl_object
115 * attributes. cl_object_size_lock() protects consistency between cl_attr's of
116 * top-object and sub-objects.
118 static int vvp_prep_size(const struct lu_env
*env
, struct cl_object
*obj
,
119 struct cl_io
*io
, loff_t start
, size_t count
,
122 struct cl_attr
*attr
= vvp_env_thread_attr(env
);
123 struct inode
*inode
= vvp_object_inode(obj
);
124 loff_t pos
= start
+ count
- 1;
129 * Consistency guarantees: following possibilities exist for the
130 * relation between region being accessed and real file size at this
133 * (A): the region is completely inside of the file;
135 * (B-x): x bytes of region are inside of the file, the rest is
138 * (C): the region is completely outside of the file.
140 * This classification is stable under DLM lock already acquired by
141 * the caller, because to change the class, other client has to take
142 * DLM lock conflicting with our lock. Also, any updates to ->i_size
143 * by other threads on this client are serialized by
144 * ll_inode_size_lock(). This guarantees that short reads are handled
145 * correctly in the face of concurrent writes and truncates.
147 vvp_object_size_lock(obj
);
148 result
= cl_object_attr_get(env
, obj
, attr
);
153 * A glimpse is necessary to determine whether we
154 * return a short read (B) or some zeroes at the end
157 vvp_object_size_unlock(obj
);
158 result
= cl_glimpse_lock(env
, io
, inode
, obj
, 0);
159 if (result
== 0 && exceed
) {
160 /* If objective page index exceed end-of-file
161 * page index, return directly. Do not expect
162 * kernel will check such case correctly.
163 * linux-2.6.18-128.1.1 miss to do that.
166 loff_t size
= i_size_read(inode
);
167 loff_t cur_index
= start
>> PAGE_SHIFT
;
168 loff_t size_index
= (size
- 1) >> PAGE_SHIFT
;
170 if ((size
== 0 && cur_index
!= 0) ||
171 size_index
< cur_index
)
177 * region is within kms and, hence, within real file
178 * size (A). We need to increase i_size to cover the
179 * read region so that generic_file_read() will do its
180 * job, but that doesn't mean the kms size is
181 * _correct_, it is only the _minimum_ size. If
182 * someone does a stat they will get the correct size
183 * which will always be >= the kms value here.
186 if (i_size_read(inode
) < kms
) {
187 i_size_write(inode
, kms
);
188 CDEBUG(D_VFSTRACE
, DFID
" updating i_size %llu\n",
189 PFID(lu_object_fid(&obj
->co_lu
)),
190 (__u64
)i_size_read(inode
));
194 vvp_object_size_unlock(obj
);
199 /*****************************************************************************
205 static int vvp_io_one_lock_index(const struct lu_env
*env
, struct cl_io
*io
,
206 __u32 enqflags
, enum cl_lock_mode mode
,
207 pgoff_t start
, pgoff_t end
)
209 struct vvp_io
*vio
= vvp_env_io(env
);
210 struct cl_lock_descr
*descr
= &vio
->vui_link
.cill_descr
;
211 struct cl_object
*obj
= io
->ci_obj
;
213 CLOBINVRNT(env
, obj
, vvp_object_invariant(obj
));
215 CDEBUG(D_VFSTRACE
, "lock: %d [%lu, %lu]\n", mode
, start
, end
);
217 memset(&vio
->vui_link
, 0, sizeof(vio
->vui_link
));
219 if (vio
->vui_fd
&& (vio
->vui_fd
->fd_flags
& LL_FILE_GROUP_LOCKED
)) {
220 descr
->cld_mode
= CLM_GROUP
;
221 descr
->cld_gid
= vio
->vui_fd
->fd_grouplock
.lg_gid
;
222 enqflags
|= CEF_LOCK_MATCH
;
224 descr
->cld_mode
= mode
;
226 descr
->cld_obj
= obj
;
227 descr
->cld_start
= start
;
228 descr
->cld_end
= end
;
229 descr
->cld_enq_flags
= enqflags
;
231 cl_io_lock_add(env
, io
, &vio
->vui_link
);
235 static int vvp_io_one_lock(const struct lu_env
*env
, struct cl_io
*io
,
236 __u32 enqflags
, enum cl_lock_mode mode
,
237 loff_t start
, loff_t end
)
239 struct cl_object
*obj
= io
->ci_obj
;
241 return vvp_io_one_lock_index(env
, io
, enqflags
, mode
,
242 cl_index(obj
, start
), cl_index(obj
, end
));
245 static int vvp_io_write_iter_init(const struct lu_env
*env
,
246 const struct cl_io_slice
*ios
)
248 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
250 cl_page_list_init(&vio
->u
.write
.vui_queue
);
251 vio
->u
.write
.vui_written
= 0;
252 vio
->u
.write
.vui_from
= 0;
253 vio
->u
.write
.vui_to
= PAGE_SIZE
;
258 static void vvp_io_write_iter_fini(const struct lu_env
*env
,
259 const struct cl_io_slice
*ios
)
261 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
263 LASSERT(vio
->u
.write
.vui_queue
.pl_nr
== 0);
266 static int vvp_io_fault_iter_init(const struct lu_env
*env
,
267 const struct cl_io_slice
*ios
)
269 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
270 struct inode
*inode
= vvp_object_inode(ios
->cis_obj
);
272 LASSERT(inode
== file_inode(vio
->vui_fd
->fd_file
));
273 vio
->u
.fault
.ft_mtime
= inode
->i_mtime
.tv_sec
;
277 static void vvp_io_fini(const struct lu_env
*env
, const struct cl_io_slice
*ios
)
279 struct cl_io
*io
= ios
->cis_io
;
280 struct cl_object
*obj
= io
->ci_obj
;
281 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
282 struct inode
*inode
= vvp_object_inode(obj
);
284 CLOBINVRNT(env
, obj
, vvp_object_invariant(obj
));
286 CDEBUG(D_VFSTRACE
, DFID
287 " ignore/verify layout %d/%d, layout version %d restore needed %d\n",
288 PFID(lu_object_fid(&obj
->co_lu
)),
289 io
->ci_ignore_layout
, io
->ci_verify_layout
,
290 vio
->vui_layout_gen
, io
->ci_restore_needed
);
292 if (io
->ci_restore_needed
) {
295 /* file was detected release, we need to restore it
296 * before finishing the io
298 rc
= ll_layout_restore(inode
, 0, OBD_OBJECT_EOF
);
299 /* if restore registration failed, no restart,
300 * we will return -ENODATA
302 /* The layout will change after restore, so we need to
303 * block on layout lock hold by the MDT
304 * as MDT will not send new layout in lvb (see LU-3124)
305 * we have to explicitly fetch it, all this will be done
306 * by ll_layout_refresh()
309 io
->ci_restore_needed
= 0;
310 io
->ci_need_restart
= 1;
311 io
->ci_verify_layout
= 1;
313 io
->ci_restore_needed
= 1;
314 io
->ci_need_restart
= 0;
315 io
->ci_verify_layout
= 0;
320 if (!io
->ci_ignore_layout
&& io
->ci_verify_layout
) {
323 /* check layout version */
324 ll_layout_refresh(inode
, &gen
);
325 io
->ci_need_restart
= vio
->vui_layout_gen
!= gen
;
326 if (io
->ci_need_restart
) {
328 DFID
" layout changed from %d to %d.\n",
329 PFID(lu_object_fid(&obj
->co_lu
)),
330 vio
->vui_layout_gen
, gen
);
331 /* today successful restore is the only possible case */
332 /* restore was done, clear restoring state */
333 clear_bit(LLIF_FILE_RESTORING
,
334 &ll_i2info(inode
)->lli_flags
);
339 static void vvp_io_fault_fini(const struct lu_env
*env
,
340 const struct cl_io_slice
*ios
)
342 struct cl_io
*io
= ios
->cis_io
;
343 struct cl_page
*page
= io
->u
.ci_fault
.ft_page
;
345 CLOBINVRNT(env
, io
->ci_obj
, vvp_object_invariant(io
->ci_obj
));
348 lu_ref_del(&page
->cp_reference
, "fault", io
);
349 cl_page_put(env
, page
);
350 io
->u
.ci_fault
.ft_page
= NULL
;
352 vvp_io_fini(env
, ios
);
355 static enum cl_lock_mode
vvp_mode_from_vma(struct vm_area_struct
*vma
)
358 * we only want to hold PW locks if the mmap() can generate
359 * writes back to the file and that only happens in shared
362 if ((vma
->vm_flags
& VM_SHARED
) && (vma
->vm_flags
& VM_WRITE
))
367 static int vvp_mmap_locks(const struct lu_env
*env
,
368 struct vvp_io
*vio
, struct cl_io
*io
)
370 struct vvp_thread_info
*cti
= vvp_env_info(env
);
371 struct mm_struct
*mm
= current
->mm
;
372 struct vm_area_struct
*vma
;
373 struct cl_lock_descr
*descr
= &cti
->vti_descr
;
374 union ldlm_policy_data policy
;
381 LASSERT(io
->ci_type
== CIT_READ
|| io
->ci_type
== CIT_WRITE
);
383 if (!vio
->vui_iter
) /* nfs or loop back device write */
386 /* No MM (e.g. NFS)? No vmas too. */
390 iov_for_each(iov
, i
, *vio
->vui_iter
) {
391 addr
= (unsigned long)iov
.iov_base
;
396 count
+= addr
& (~PAGE_MASK
);
399 down_read(&mm
->mmap_sem
);
400 while ((vma
= our_vma(mm
, addr
, count
)) != NULL
) {
401 struct inode
*inode
= file_inode(vma
->vm_file
);
402 int flags
= CEF_MUST
;
404 if (ll_file_nolock(vma
->vm_file
)) {
406 * For no lock case is not allowed for mmap
413 * XXX: Required lock mode can be weakened: CIT_WRITE
414 * io only ever reads user level buffer, and CIT_READ
417 policy_from_vma(&policy
, vma
, addr
, count
);
418 descr
->cld_mode
= vvp_mode_from_vma(vma
);
419 descr
->cld_obj
= ll_i2info(inode
)->lli_clob
;
420 descr
->cld_start
= cl_index(descr
->cld_obj
,
421 policy
.l_extent
.start
);
422 descr
->cld_end
= cl_index(descr
->cld_obj
,
423 policy
.l_extent
.end
);
424 descr
->cld_enq_flags
= flags
;
425 result
= cl_io_lock_alloc_add(env
, io
, descr
);
427 CDEBUG(D_VFSTRACE
, "lock: %d: [%lu, %lu]\n",
428 descr
->cld_mode
, descr
->cld_start
,
434 if (vma
->vm_end
- addr
>= count
)
437 count
-= vma
->vm_end
- addr
;
440 up_read(&mm
->mmap_sem
);
447 static void vvp_io_advance(const struct lu_env
*env
,
448 const struct cl_io_slice
*ios
,
451 struct cl_object
*obj
= ios
->cis_io
->ci_obj
;
452 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
454 CLOBINVRNT(env
, obj
, vvp_object_invariant(obj
));
456 vio
->vui_tot_count
-= nob
;
457 iov_iter_reexpand(vio
->vui_iter
, vio
->vui_tot_count
);
460 static void vvp_io_update_iov(const struct lu_env
*env
,
461 struct vvp_io
*vio
, struct cl_io
*io
)
463 size_t size
= io
->u
.ci_rw
.crw_count
;
468 iov_iter_truncate(vio
->vui_iter
, size
);
471 static int vvp_io_rw_lock(const struct lu_env
*env
, struct cl_io
*io
,
472 enum cl_lock_mode mode
, loff_t start
, loff_t end
)
474 struct vvp_io
*vio
= vvp_env_io(env
);
478 LASSERT(io
->ci_type
== CIT_READ
|| io
->ci_type
== CIT_WRITE
);
480 vvp_io_update_iov(env
, vio
, io
);
482 if (io
->u
.ci_rw
.crw_nonblock
)
483 ast_flags
|= CEF_NONBLOCK
;
484 result
= vvp_mmap_locks(env
, vio
, io
);
486 result
= vvp_io_one_lock(env
, io
, ast_flags
, mode
, start
, end
);
490 static int vvp_io_read_lock(const struct lu_env
*env
,
491 const struct cl_io_slice
*ios
)
493 struct cl_io
*io
= ios
->cis_io
;
494 struct cl_io_rw_common
*rd
= &io
->u
.ci_rd
.rd
;
497 result
= vvp_io_rw_lock(env
, io
, CLM_READ
, rd
->crw_pos
,
498 rd
->crw_pos
+ rd
->crw_count
- 1);
503 static int vvp_io_fault_lock(const struct lu_env
*env
,
504 const struct cl_io_slice
*ios
)
506 struct cl_io
*io
= ios
->cis_io
;
507 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
509 * XXX LDLM_FL_CBPENDING
511 return vvp_io_one_lock_index(env
,
513 vvp_mode_from_vma(vio
->u
.fault
.ft_vma
),
514 io
->u
.ci_fault
.ft_index
,
515 io
->u
.ci_fault
.ft_index
);
518 static int vvp_io_write_lock(const struct lu_env
*env
,
519 const struct cl_io_slice
*ios
)
521 struct cl_io
*io
= ios
->cis_io
;
525 if (io
->u
.ci_wr
.wr_append
) {
527 end
= OBD_OBJECT_EOF
;
529 start
= io
->u
.ci_wr
.wr
.crw_pos
;
530 end
= start
+ io
->u
.ci_wr
.wr
.crw_count
- 1;
532 return vvp_io_rw_lock(env
, io
, CLM_WRITE
, start
, end
);
535 static int vvp_io_setattr_iter_init(const struct lu_env
*env
,
536 const struct cl_io_slice
*ios
)
542 * Implementation of cl_io_operations::vio_lock() method for CIT_SETATTR io.
544 * Handles "lockless io" mode when extent locking is done by server.
546 static int vvp_io_setattr_lock(const struct lu_env
*env
,
547 const struct cl_io_slice
*ios
)
549 struct cl_io
*io
= ios
->cis_io
;
553 if (cl_io_is_trunc(io
)) {
554 new_size
= io
->u
.ci_setattr
.sa_attr
.lvb_size
;
556 enqflags
= CEF_DISCARD_DATA
;
558 unsigned int valid
= io
->u
.ci_setattr
.sa_valid
;
560 if (!(valid
& TIMES_SET_FLAGS
))
563 if ((!(valid
& ATTR_MTIME
) ||
564 io
->u
.ci_setattr
.sa_attr
.lvb_mtime
>=
565 io
->u
.ci_setattr
.sa_attr
.lvb_ctime
) &&
566 (!(valid
& ATTR_ATIME
) ||
567 io
->u
.ci_setattr
.sa_attr
.lvb_atime
>=
568 io
->u
.ci_setattr
.sa_attr
.lvb_ctime
))
573 return vvp_io_one_lock(env
, io
, enqflags
, CLM_WRITE
,
574 new_size
, OBD_OBJECT_EOF
);
577 static int vvp_do_vmtruncate(struct inode
*inode
, size_t size
)
581 * Only ll_inode_size_lock is taken at this level.
583 ll_inode_size_lock(inode
);
584 result
= inode_newsize_ok(inode
, size
);
586 ll_inode_size_unlock(inode
);
589 truncate_setsize(inode
, size
);
590 ll_inode_size_unlock(inode
);
594 static int vvp_io_setattr_time(const struct lu_env
*env
,
595 const struct cl_io_slice
*ios
)
597 struct cl_io
*io
= ios
->cis_io
;
598 struct cl_object
*obj
= io
->ci_obj
;
599 struct cl_attr
*attr
= vvp_env_thread_attr(env
);
601 unsigned valid
= CAT_CTIME
;
603 cl_object_attr_lock(obj
);
604 attr
->cat_ctime
= io
->u
.ci_setattr
.sa_attr
.lvb_ctime
;
605 if (io
->u
.ci_setattr
.sa_valid
& ATTR_ATIME_SET
) {
606 attr
->cat_atime
= io
->u
.ci_setattr
.sa_attr
.lvb_atime
;
609 if (io
->u
.ci_setattr
.sa_valid
& ATTR_MTIME_SET
) {
610 attr
->cat_mtime
= io
->u
.ci_setattr
.sa_attr
.lvb_mtime
;
613 result
= cl_object_attr_update(env
, obj
, attr
, valid
);
614 cl_object_attr_unlock(obj
);
619 static int vvp_io_setattr_start(const struct lu_env
*env
,
620 const struct cl_io_slice
*ios
)
622 struct cl_io
*io
= ios
->cis_io
;
623 struct inode
*inode
= vvp_object_inode(io
->ci_obj
);
624 struct ll_inode_info
*lli
= ll_i2info(inode
);
626 if (cl_io_is_trunc(io
)) {
627 down_write(&lli
->lli_trunc_sem
);
629 inode_dio_wait(inode
);
634 if (io
->u
.ci_setattr
.sa_valid
& TIMES_SET_FLAGS
)
635 return vvp_io_setattr_time(env
, ios
);
640 static void vvp_io_setattr_end(const struct lu_env
*env
,
641 const struct cl_io_slice
*ios
)
643 struct cl_io
*io
= ios
->cis_io
;
644 struct inode
*inode
= vvp_object_inode(io
->ci_obj
);
645 struct ll_inode_info
*lli
= ll_i2info(inode
);
647 if (cl_io_is_trunc(io
)) {
648 /* Truncate in memory pages - they must be clean pages
649 * because osc has already notified to destroy osc_extents.
651 vvp_do_vmtruncate(inode
, io
->u
.ci_setattr
.sa_attr
.lvb_size
);
653 up_write(&lli
->lli_trunc_sem
);
659 static void vvp_io_setattr_fini(const struct lu_env
*env
,
660 const struct cl_io_slice
*ios
)
662 bool restore_needed
= ios
->cis_io
->ci_restore_needed
;
663 struct inode
*inode
= vvp_object_inode(ios
->cis_obj
);
665 vvp_io_fini(env
, ios
);
667 if (restore_needed
&& !ios
->cis_io
->ci_restore_needed
) {
668 /* restore finished, set data modified flag for HSM */
669 set_bit(LLIF_DATA_MODIFIED
, &(ll_i2info(inode
))->lli_flags
);
673 static int vvp_io_read_start(const struct lu_env
*env
,
674 const struct cl_io_slice
*ios
)
676 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
677 struct cl_io
*io
= ios
->cis_io
;
678 struct cl_object
*obj
= io
->ci_obj
;
679 struct inode
*inode
= vvp_object_inode(obj
);
680 struct ll_inode_info
*lli
= ll_i2info(inode
);
681 struct file
*file
= vio
->vui_fd
->fd_file
;
684 loff_t pos
= io
->u
.ci_rd
.rd
.crw_pos
;
685 long cnt
= io
->u
.ci_rd
.rd
.crw_count
;
686 long tot
= vio
->vui_tot_count
;
689 CLOBINVRNT(env
, obj
, vvp_object_invariant(obj
));
691 CDEBUG(D_VFSTRACE
, "read: -> [%lli, %lli)\n", pos
, pos
+ cnt
);
693 down_read(&lli
->lli_trunc_sem
);
695 if (!can_populate_pages(env
, io
, inode
))
698 result
= vvp_prep_size(env
, obj
, io
, pos
, tot
, &exceed
);
701 else if (exceed
!= 0)
704 LU_OBJECT_HEADER(D_INODE
, env
, &obj
->co_lu
,
705 "Read ino %lu, %lu bytes, offset %lld, size %llu\n",
706 inode
->i_ino
, cnt
, pos
, i_size_read(inode
));
708 /* turn off the kernel's read-ahead */
709 vio
->vui_fd
->fd_file
->f_ra
.ra_pages
= 0;
711 /* initialize read-ahead window once per syscall */
712 if (!vio
->vui_ra_valid
) {
713 vio
->vui_ra_valid
= true;
714 vio
->vui_ra_start
= cl_index(obj
, pos
);
715 vio
->vui_ra_count
= cl_index(obj
, tot
+ PAGE_SIZE
- 1);
721 LASSERT(vio
->vui_iocb
->ki_pos
== pos
);
722 result
= generic_file_read_iter(vio
->vui_iocb
, vio
->vui_iter
);
728 io
->ci_nob
+= result
;
729 ll_rw_stats_tally(ll_i2sbi(inode
), current
->pid
,
730 vio
->vui_fd
, pos
, result
, READ
);
736 static int vvp_io_commit_sync(const struct lu_env
*env
, struct cl_io
*io
,
737 struct cl_page_list
*plist
, int from
, int to
)
739 struct cl_2queue
*queue
= &io
->ci_queue
;
740 struct cl_page
*page
;
741 unsigned int bytes
= 0;
744 if (plist
->pl_nr
== 0)
747 if (from
> 0 || to
!= PAGE_SIZE
) {
748 page
= cl_page_list_first(plist
);
749 if (plist
->pl_nr
== 1) {
750 cl_page_clip(env
, page
, from
, to
);
753 cl_page_clip(env
, page
, from
, PAGE_SIZE
);
754 if (to
!= PAGE_SIZE
) {
755 page
= cl_page_list_last(plist
);
756 cl_page_clip(env
, page
, 0, to
);
761 cl_2queue_init(queue
);
762 cl_page_list_splice(plist
, &queue
->c2_qin
);
763 rc
= cl_io_submit_sync(env
, io
, CRT_WRITE
, queue
, 0);
765 /* plist is not sorted any more */
766 cl_page_list_splice(&queue
->c2_qin
, plist
);
767 cl_page_list_splice(&queue
->c2_qout
, plist
);
768 cl_2queue_fini(env
, queue
);
771 /* calculate bytes */
772 bytes
= plist
->pl_nr
<< PAGE_SHIFT
;
773 bytes
-= from
+ PAGE_SIZE
- to
;
775 while (plist
->pl_nr
> 0) {
776 page
= cl_page_list_first(plist
);
777 cl_page_list_del(env
, plist
, page
);
779 cl_page_clip(env
, page
, 0, PAGE_SIZE
);
781 SetPageUptodate(cl_page_vmpage(page
));
782 cl_page_disown(env
, io
, page
);
784 /* held in ll_cl_init() */
785 lu_ref_del(&page
->cp_reference
, "cl_io", io
);
786 cl_page_put(env
, page
);
790 return bytes
> 0 ? bytes
: rc
;
793 static void write_commit_callback(const struct lu_env
*env
, struct cl_io
*io
,
794 struct cl_page
*page
)
796 struct page
*vmpage
= page
->cp_vmpage
;
798 SetPageUptodate(vmpage
);
799 set_page_dirty(vmpage
);
801 cl_page_disown(env
, io
, page
);
803 /* held in ll_cl_init() */
804 lu_ref_del(&page
->cp_reference
, "cl_io", cl_io_top(io
));
805 cl_page_put(env
, page
);
808 /* make sure the page list is contiguous */
809 static bool page_list_sanity_check(struct cl_object
*obj
,
810 struct cl_page_list
*plist
)
812 struct cl_page
*page
;
813 pgoff_t index
= CL_PAGE_EOF
;
815 cl_page_list_for_each(page
, plist
) {
816 struct vvp_page
*vpg
= cl_object_page_slice(obj
, page
);
818 if (index
== CL_PAGE_EOF
) {
819 index
= vvp_index(vpg
);
824 if (index
== vvp_index(vpg
))
832 /* Return how many bytes have queued or written */
833 int vvp_io_write_commit(const struct lu_env
*env
, struct cl_io
*io
)
835 struct cl_object
*obj
= io
->ci_obj
;
836 struct inode
*inode
= vvp_object_inode(obj
);
837 struct vvp_io
*vio
= vvp_env_io(env
);
838 struct cl_page_list
*queue
= &vio
->u
.write
.vui_queue
;
839 struct cl_page
*page
;
842 unsigned int npages
= vio
->u
.write
.vui_queue
.pl_nr
;
847 CDEBUG(D_VFSTRACE
, "commit async pages: %d, from %d, to %d\n",
848 npages
, vio
->u
.write
.vui_from
, vio
->u
.write
.vui_to
);
850 LASSERT(page_list_sanity_check(obj
, queue
));
852 /* submit IO with async write */
853 rc
= cl_io_commit_async(env
, io
, queue
,
854 vio
->u
.write
.vui_from
, vio
->u
.write
.vui_to
,
855 write_commit_callback
);
856 npages
-= queue
->pl_nr
; /* already committed pages */
858 /* calculate how many bytes were written */
859 bytes
= npages
<< PAGE_SHIFT
;
862 bytes
-= vio
->u
.write
.vui_from
;
863 if (queue
->pl_nr
== 0) /* last page */
864 bytes
-= PAGE_SIZE
- vio
->u
.write
.vui_to
;
865 LASSERTF(bytes
> 0, "bytes = %d, pages = %d\n", bytes
, npages
);
867 vio
->u
.write
.vui_written
+= bytes
;
869 CDEBUG(D_VFSTRACE
, "Committed %d pages %d bytes, tot: %ld\n",
870 npages
, bytes
, vio
->u
.write
.vui_written
);
872 /* the first page must have been written. */
873 vio
->u
.write
.vui_from
= 0;
875 LASSERT(page_list_sanity_check(obj
, queue
));
876 LASSERT(ergo(rc
== 0, queue
->pl_nr
== 0));
878 /* out of quota, try sync write */
879 if (rc
== -EDQUOT
&& !cl_io_is_mkwrite(io
)) {
880 rc
= vvp_io_commit_sync(env
, io
, queue
,
881 vio
->u
.write
.vui_from
,
882 vio
->u
.write
.vui_to
);
884 vio
->u
.write
.vui_written
+= rc
;
889 /* update inode size */
890 ll_merge_attr(env
, inode
);
892 /* Now the pages in queue were failed to commit, discard them
893 * unless they were dirtied before.
895 while (queue
->pl_nr
> 0) {
896 page
= cl_page_list_first(queue
);
897 cl_page_list_del(env
, queue
, page
);
899 if (!PageDirty(cl_page_vmpage(page
)))
900 cl_page_discard(env
, io
, page
);
902 cl_page_disown(env
, io
, page
);
904 /* held in ll_cl_init() */
905 lu_ref_del(&page
->cp_reference
, "cl_io", io
);
906 cl_page_put(env
, page
);
908 cl_page_list_fini(env
, queue
);
913 static int vvp_io_write_start(const struct lu_env
*env
,
914 const struct cl_io_slice
*ios
)
916 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
917 struct cl_io
*io
= ios
->cis_io
;
918 struct cl_object
*obj
= io
->ci_obj
;
919 struct inode
*inode
= vvp_object_inode(obj
);
920 struct ll_inode_info
*lli
= ll_i2info(inode
);
922 loff_t pos
= io
->u
.ci_wr
.wr
.crw_pos
;
923 size_t cnt
= io
->u
.ci_wr
.wr
.crw_count
;
925 down_read(&lli
->lli_trunc_sem
);
927 if (!can_populate_pages(env
, io
, inode
))
930 if (cl_io_is_append(io
)) {
932 * PARALLEL IO This has to be changed for parallel IO doing
933 * out-of-order writes.
935 ll_merge_attr(env
, inode
);
936 pos
= i_size_read(inode
);
937 io
->u
.ci_wr
.wr
.crw_pos
= pos
;
938 vio
->vui_iocb
->ki_pos
= pos
;
940 LASSERT(vio
->vui_iocb
->ki_pos
== pos
);
943 CDEBUG(D_VFSTRACE
, "write: [%lli, %lli)\n", pos
, pos
+ (long long)cnt
);
946 * The maximum Lustre file size is variable, based on the OST maximum
947 * object size and number of stripes. This needs another check in
948 * addition to the VFS checks earlier.
950 if (pos
+ cnt
> ll_file_maxbytes(inode
)) {
952 "%s: file " DFID
" offset %llu > maxbytes %llu\n",
953 ll_get_fsname(inode
->i_sb
, NULL
, 0),
954 PFID(ll_inode2fid(inode
)), pos
+ cnt
,
955 ll_file_maxbytes(inode
));
959 if (!vio
->vui_iter
) {
960 /* from a temp io in ll_cl_init(). */
964 * When using the locked AIO function (generic_file_aio_write())
965 * testing has shown the inode mutex to be a limiting factor
966 * with multi-threaded single shared file performance. To get
967 * around this, we now use the lockless version. To maintain
968 * consistency, proper locking to protect against writes,
969 * trucates, etc. is handled in the higher layers of lustre.
971 bool lock_node
= !IS_NOSEC(inode
);
975 result
= __generic_file_write_iter(vio
->vui_iocb
,
980 if (result
> 0 || result
== -EIOCBQUEUED
)
981 result
= generic_write_sync(vio
->vui_iocb
, result
);
985 result
= vvp_io_write_commit(env
, io
);
986 if (vio
->u
.write
.vui_written
> 0) {
987 result
= vio
->u
.write
.vui_written
;
988 io
->ci_nob
+= result
;
990 CDEBUG(D_VFSTRACE
, "write: nob %zd, result: %zd\n",
995 set_bit(LLIF_DATA_MODIFIED
, &(ll_i2info(inode
))->lli_flags
);
999 ll_rw_stats_tally(ll_i2sbi(inode
), current
->pid
,
1000 vio
->vui_fd
, pos
, result
, WRITE
);
1006 static void vvp_io_rw_end(const struct lu_env
*env
,
1007 const struct cl_io_slice
*ios
)
1009 struct inode
*inode
= vvp_object_inode(ios
->cis_obj
);
1010 struct ll_inode_info
*lli
= ll_i2info(inode
);
1012 up_read(&lli
->lli_trunc_sem
);
1015 static int vvp_io_kernel_fault(struct vvp_fault_io
*cfio
)
1017 struct vm_fault
*vmf
= cfio
->ft_vmf
;
1019 cfio
->ft_flags
= filemap_fault(vmf
);
1020 cfio
->ft_flags_valid
= 1;
1024 "page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n",
1025 vmf
->page
, vmf
->page
->mapping
, vmf
->page
->index
,
1026 (long)vmf
->page
->flags
, page_count(vmf
->page
),
1027 page_private(vmf
->page
), (void *)vmf
->address
);
1028 if (unlikely(!(cfio
->ft_flags
& VM_FAULT_LOCKED
))) {
1029 lock_page(vmf
->page
);
1030 cfio
->ft_flags
|= VM_FAULT_LOCKED
;
1033 cfio
->ft_vmpage
= vmf
->page
;
1037 if (cfio
->ft_flags
& (VM_FAULT_SIGBUS
| VM_FAULT_SIGSEGV
)) {
1038 CDEBUG(D_PAGE
, "got addr %p - SIGBUS\n", (void *)vmf
->address
);
1042 if (cfio
->ft_flags
& VM_FAULT_OOM
) {
1043 CDEBUG(D_PAGE
, "got addr %p - OOM\n", (void *)vmf
->address
);
1047 if (cfio
->ft_flags
& VM_FAULT_RETRY
)
1050 CERROR("Unknown error in page fault %d!\n", cfio
->ft_flags
);
1054 static void mkwrite_commit_callback(const struct lu_env
*env
, struct cl_io
*io
,
1055 struct cl_page
*page
)
1057 set_page_dirty(page
->cp_vmpage
);
1060 static int vvp_io_fault_start(const struct lu_env
*env
,
1061 const struct cl_io_slice
*ios
)
1063 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
1064 struct cl_io
*io
= ios
->cis_io
;
1065 struct cl_object
*obj
= io
->ci_obj
;
1066 struct inode
*inode
= vvp_object_inode(obj
);
1067 struct ll_inode_info
*lli
= ll_i2info(inode
);
1068 struct cl_fault_io
*fio
= &io
->u
.ci_fault
;
1069 struct vvp_fault_io
*cfio
= &vio
->u
.fault
;
1072 struct page
*vmpage
= NULL
;
1073 struct cl_page
*page
;
1077 down_read(&lli
->lli_trunc_sem
);
1079 /* offset of the last byte on the page */
1080 offset
= cl_offset(obj
, fio
->ft_index
+ 1) - 1;
1081 LASSERT(cl_index(obj
, offset
) == fio
->ft_index
);
1082 result
= vvp_prep_size(env
, obj
, io
, 0, offset
+ 1, NULL
);
1086 /* must return locked page */
1087 if (fio
->ft_mkwrite
) {
1088 LASSERT(cfio
->ft_vmpage
);
1089 lock_page(cfio
->ft_vmpage
);
1091 result
= vvp_io_kernel_fault(cfio
);
1096 vmpage
= cfio
->ft_vmpage
;
1097 LASSERT(PageLocked(vmpage
));
1099 if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE
))
1100 ll_invalidate_page(vmpage
);
1102 size
= i_size_read(inode
);
1103 /* Though we have already held a cl_lock upon this page, but
1104 * it still can be truncated locally.
1106 if (unlikely((vmpage
->mapping
!= inode
->i_mapping
) ||
1107 (page_offset(vmpage
) > size
))) {
1108 CDEBUG(D_PAGE
, "llite: fault and truncate race happened!\n");
1110 /* return +1 to stop cl_io_loop() and ll_fault() will catch
1117 last_index
= cl_index(obj
, size
- 1);
1119 if (fio
->ft_mkwrite
) {
1121 * Capture the size while holding the lli_trunc_sem from above
1122 * we want to make sure that we complete the mkwrite action
1123 * while holding this lock. We need to make sure that we are
1124 * not past the end of the file.
1126 if (last_index
< fio
->ft_index
) {
1128 "llite: mkwrite and truncate race happened: %p: 0x%lx 0x%lx\n",
1129 vmpage
->mapping
, fio
->ft_index
, last_index
);
1131 * We need to return if we are
1132 * passed the end of the file. This will propagate
1133 * up the call stack to ll_page_mkwrite where
1134 * we will return VM_FAULT_NOPAGE. Any non-negative
1135 * value returned here will be silently
1136 * converted to 0. If the vmpage->mapping is null
1137 * the error code would be converted back to ENODATA
1138 * in ll_page_mkwrite0. Thus we return -ENODATA
1139 * to handle both cases
1146 page
= cl_page_find(env
, obj
, fio
->ft_index
, vmpage
, CPT_CACHEABLE
);
1148 result
= PTR_ERR(page
);
1152 /* if page is going to be written, we should add this page into cache
1155 if (fio
->ft_mkwrite
) {
1156 wait_on_page_writeback(vmpage
);
1157 if (!PageDirty(vmpage
)) {
1158 struct cl_page_list
*plist
= &io
->ci_queue
.c2_qin
;
1159 struct vvp_page
*vpg
= cl_object_page_slice(obj
, page
);
1162 /* vvp_page_assume() calls wait_on_page_writeback(). */
1163 cl_page_assume(env
, io
, page
);
1165 cl_page_list_init(plist
);
1166 cl_page_list_add(plist
, page
);
1169 if (last_index
== vvp_index(vpg
))
1170 to
= size
& ~PAGE_MASK
;
1172 /* Do not set Dirty bit here so that in case IO is
1173 * started before the page is really made dirty, we
1174 * still have chance to detect it.
1176 result
= cl_io_commit_async(env
, io
, plist
, 0, to
,
1177 mkwrite_commit_callback
);
1178 LASSERT(cl_page_is_owned(page
, io
));
1179 cl_page_list_fini(env
, plist
);
1183 cl_page_discard(env
, io
, page
);
1184 cl_page_disown(env
, io
, page
);
1186 cl_page_put(env
, page
);
1188 /* we're in big trouble, what can we do now? */
1189 if (result
== -EDQUOT
)
1193 cl_page_disown(env
, io
, page
);
1199 * The ft_index is only used in the case of
1200 * a mkwrite action. We need to check
1201 * our assertions are correct, since
1202 * we should have caught this above
1204 LASSERT(!fio
->ft_mkwrite
|| fio
->ft_index
<= last_index
);
1205 if (fio
->ft_index
== last_index
)
1207 * Last page is mapped partially.
1209 fio
->ft_nob
= size
- cl_offset(obj
, fio
->ft_index
);
1211 fio
->ft_nob
= cl_page_size(obj
);
1213 lu_ref_add(&page
->cp_reference
, "fault", io
);
1214 fio
->ft_page
= page
;
1217 /* return unlocked vmpage to avoid deadlocking */
1219 unlock_page(vmpage
);
1221 cfio
->ft_flags
&= ~VM_FAULT_LOCKED
;
1226 static void vvp_io_fault_end(const struct lu_env
*env
,
1227 const struct cl_io_slice
*ios
)
1229 struct inode
*inode
= vvp_object_inode(ios
->cis_obj
);
1230 struct ll_inode_info
*lli
= ll_i2info(inode
);
1232 CLOBINVRNT(env
, ios
->cis_io
->ci_obj
,
1233 vvp_object_invariant(ios
->cis_io
->ci_obj
));
1234 up_read(&lli
->lli_trunc_sem
);
1237 static int vvp_io_fsync_start(const struct lu_env
*env
,
1238 const struct cl_io_slice
*ios
)
1240 /* we should mark TOWRITE bit to each dirty page in radix tree to
1241 * verify pages have been written, but this is difficult because of
1247 static int vvp_io_read_ahead(const struct lu_env
*env
,
1248 const struct cl_io_slice
*ios
,
1249 pgoff_t start
, struct cl_read_ahead
*ra
)
1253 if (ios
->cis_io
->ci_type
== CIT_READ
||
1254 ios
->cis_io
->ci_type
== CIT_FAULT
) {
1255 struct vvp_io
*vio
= cl2vvp_io(env
, ios
);
1257 if (unlikely(vio
->vui_fd
->fd_flags
& LL_FILE_GROUP_LOCKED
)) {
1258 ra
->cra_end
= CL_PAGE_EOF
;
1259 result
= 1; /* no need to call down */
1266 static const struct cl_io_operations vvp_io_ops
= {
1269 .cio_fini
= vvp_io_fini
,
1270 .cio_lock
= vvp_io_read_lock
,
1271 .cio_start
= vvp_io_read_start
,
1272 .cio_end
= vvp_io_rw_end
,
1273 .cio_advance
= vvp_io_advance
,
1276 .cio_fini
= vvp_io_fini
,
1277 .cio_iter_init
= vvp_io_write_iter_init
,
1278 .cio_iter_fini
= vvp_io_write_iter_fini
,
1279 .cio_lock
= vvp_io_write_lock
,
1280 .cio_start
= vvp_io_write_start
,
1281 .cio_end
= vvp_io_rw_end
,
1282 .cio_advance
= vvp_io_advance
,
1285 .cio_fini
= vvp_io_setattr_fini
,
1286 .cio_iter_init
= vvp_io_setattr_iter_init
,
1287 .cio_lock
= vvp_io_setattr_lock
,
1288 .cio_start
= vvp_io_setattr_start
,
1289 .cio_end
= vvp_io_setattr_end
1292 .cio_fini
= vvp_io_fault_fini
,
1293 .cio_iter_init
= vvp_io_fault_iter_init
,
1294 .cio_lock
= vvp_io_fault_lock
,
1295 .cio_start
= vvp_io_fault_start
,
1296 .cio_end
= vvp_io_fault_end
,
1299 .cio_start
= vvp_io_fsync_start
,
1300 .cio_fini
= vvp_io_fini
1303 .cio_fini
= vvp_io_fini
1306 .cio_read_ahead
= vvp_io_read_ahead
,
1309 int vvp_io_init(const struct lu_env
*env
, struct cl_object
*obj
,
1312 struct vvp_io
*vio
= vvp_env_io(env
);
1313 struct inode
*inode
= vvp_object_inode(obj
);
1316 CLOBINVRNT(env
, obj
, vvp_object_invariant(obj
));
1318 CDEBUG(D_VFSTRACE
, DFID
1319 " ignore/verify layout %d/%d, layout version %d restore needed %d\n",
1320 PFID(lu_object_fid(&obj
->co_lu
)),
1321 io
->ci_ignore_layout
, io
->ci_verify_layout
,
1322 vio
->vui_layout_gen
, io
->ci_restore_needed
);
1324 CL_IO_SLICE_CLEAN(vio
, vui_cl
);
1325 cl_io_slice_add(io
, &vio
->vui_cl
, obj
, &vvp_io_ops
);
1326 vio
->vui_ra_valid
= false;
1328 if (io
->ci_type
== CIT_READ
|| io
->ci_type
== CIT_WRITE
) {
1330 struct ll_inode_info
*lli
= ll_i2info(inode
);
1332 count
= io
->u
.ci_rw
.crw_count
;
1333 /* "If nbyte is 0, read() will return 0 and have no other
1334 * results." -- Single Unix Spec
1339 vio
->vui_tot_count
= count
;
1341 /* for read/write, we store the jobid in the inode, and
1342 * it'll be fetched by osc when building RPC.
1344 * it's not accurate if the file is shared by different
1347 lustre_get_jobid(lli
->lli_jobid
);
1348 } else if (io
->ci_type
== CIT_SETATTR
) {
1349 if (!cl_io_is_trunc(io
))
1350 io
->ci_lockreq
= CILR_MANDATORY
;
1353 /* Enqueue layout lock and get layout version. We need to do this
1354 * even for operations requiring to open file, such as read and write,
1355 * because it might not grant layout lock in IT_OPEN.
1357 if (result
== 0 && !io
->ci_ignore_layout
) {
1358 result
= ll_layout_refresh(inode
, &vio
->vui_layout_gen
);
1359 if (result
== -ENOENT
)
1360 /* If the inode on MDS has been removed, but the objects
1361 * on OSTs haven't been destroyed (async unlink), layout
1362 * fetch will return -ENOENT, we'd ignore this error
1363 * and continue with dirty flush. LU-3230.
1367 CERROR("%s: refresh file layout " DFID
" error %d.\n",
1368 ll_get_fsname(inode
->i_sb
, NULL
, 0),
1369 PFID(lu_object_fid(&obj
->co_lu
)), result
);