Commit | Line | Data |
---|---|---|
d7e09d03 PT |
1 | /* |
2 | * GPL HEADER START | |
3 | * | |
4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 | * | |
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. | |
9 | * | |
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). | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * version 2 along with this program; If not, see | |
6a5b99a4 | 18 | * http://www.gnu.org/licenses/gpl-2.0.html |
d7e09d03 | 19 | * |
d7e09d03 PT |
20 | * GPL HEADER END |
21 | */ | |
22 | /* | |
23 | * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Use is subject to license terms. | |
25 | * | |
1dc563a6 | 26 | * Copyright (c) 2011, 2015, Intel Corporation. |
d7e09d03 PT |
27 | */ |
28 | /* | |
29 | * This file is part of Lustre, http://www.lustre.org/ | |
30 | * Lustre is a trademark of Sun Microsystems, Inc. | |
31 | * | |
32 | * Implementation of cl_io for VVP layer. | |
33 | * | |
34 | * Author: Nikita Danilov <nikita.danilov@sun.com> | |
35 | * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com> | |
36 | */ | |
37 | ||
38 | #define DEBUG_SUBSYSTEM S_LLITE | |
39 | ||
67a235f5 GKH |
40 | #include "../include/obd.h" |
41 | #include "../include/lustre_lite.h" | |
d7e09d03 | 42 | |
0d345656 | 43 | #include "llite_internal.h" |
d7e09d03 PT |
44 | #include "vvp_internal.h" |
45 | ||
e3c9078a TH |
46 | static struct vvp_io *cl2vvp_io(const struct lu_env *env, |
47 | const struct cl_io_slice *slice) | |
fee6eb50 JH |
48 | { |
49 | struct vvp_io *vio; | |
50 | ||
51 | vio = container_of(slice, struct vvp_io, vui_cl); | |
52 | LASSERT(vio == vvp_env_io(env)); | |
53 | ||
54 | return vio; | |
55 | } | |
56 | ||
d7e09d03 PT |
57 | /** |
58 | * For swapping layout. The file's layout may have changed. | |
59 | * To avoid populating pages to a wrong stripe, we have to verify the | |
60 | * correctness of layout. It works because swapping layout processes | |
61 | * have to acquire group lock. | |
62 | */ | |
63 | static bool can_populate_pages(const struct lu_env *env, struct cl_io *io, | |
e15ba45d | 64 | struct inode *inode) |
d7e09d03 PT |
65 | { |
66 | struct ll_inode_info *lli = ll_i2info(inode); | |
e0a8144b | 67 | struct vvp_io *vio = vvp_env_io(env); |
d7e09d03 PT |
68 | bool rc = true; |
69 | ||
70 | switch (io->ci_type) { | |
71 | case CIT_READ: | |
72 | case CIT_WRITE: | |
73 | /* don't need lock here to check lli_layout_gen as we have held | |
c0894c6c OD |
74 | * extent lock and GROUP lock has to hold to swap layout |
75 | */ | |
e0a8144b | 76 | if (ll_layout_version_get(lli) != vio->vui_layout_gen) { |
d7e09d03 PT |
77 | io->ci_need_restart = 1; |
78 | /* this will return application a short read/write */ | |
79 | io->ci_continue = 0; | |
80 | rc = false; | |
81 | } | |
82 | case CIT_FAULT: | |
83 | /* fault is okay because we've already had a page. */ | |
84 | default: | |
85 | break; | |
86 | } | |
87 | ||
88 | return rc; | |
89 | } | |
90 | ||
fee6eb50 JH |
91 | static void vvp_object_size_lock(struct cl_object *obj) |
92 | { | |
93 | struct inode *inode = vvp_object_inode(obj); | |
94 | ||
95 | ll_inode_size_lock(inode); | |
96 | cl_object_attr_lock(obj); | |
97 | } | |
98 | ||
99 | static void vvp_object_size_unlock(struct cl_object *obj) | |
100 | { | |
101 | struct inode *inode = vvp_object_inode(obj); | |
102 | ||
103 | cl_object_attr_unlock(obj); | |
104 | ll_inode_size_unlock(inode); | |
105 | } | |
106 | ||
107 | /** | |
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. | |
112 | * | |
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. | |
117 | */ | |
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, | |
120 | int *exceed) | |
121 | { | |
9acc4500 | 122 | struct cl_attr *attr = vvp_env_thread_attr(env); |
fee6eb50 JH |
123 | struct inode *inode = vvp_object_inode(obj); |
124 | loff_t pos = start + count - 1; | |
125 | loff_t kms; | |
126 | int result; | |
127 | ||
128 | /* | |
129 | * Consistency guarantees: following possibilities exist for the | |
130 | * relation between region being accessed and real file size at this | |
131 | * moment: | |
132 | * | |
133 | * (A): the region is completely inside of the file; | |
134 | * | |
135 | * (B-x): x bytes of region are inside of the file, the rest is | |
136 | * outside; | |
137 | * | |
138 | * (C): the region is completely outside of the file. | |
139 | * | |
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. | |
146 | */ | |
147 | vvp_object_size_lock(obj); | |
148 | result = cl_object_attr_get(env, obj, attr); | |
149 | if (result == 0) { | |
150 | kms = attr->cat_kms; | |
151 | if (pos > kms) { | |
152 | /* | |
153 | * A glimpse is necessary to determine whether we | |
154 | * return a short read (B) or some zeroes at the end | |
155 | * of the buffer (C) | |
156 | */ | |
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. | |
164 | * --bug 17336 | |
165 | */ | |
166 | loff_t size = i_size_read(inode); | |
5f479924 GKH |
167 | loff_t cur_index = start >> PAGE_SHIFT; |
168 | loff_t size_index = (size - 1) >> PAGE_SHIFT; | |
fee6eb50 JH |
169 | |
170 | if ((size == 0 && cur_index != 0) || | |
171 | size_index < cur_index) | |
172 | *exceed = 1; | |
173 | } | |
174 | return result; | |
175 | } | |
176 | /* | |
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. | |
184 | * b=11081 | |
185 | */ | |
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)); | |
191 | } | |
192 | } | |
193 | ||
194 | vvp_object_size_unlock(obj); | |
195 | ||
196 | return result; | |
197 | } | |
198 | ||
d7e09d03 PT |
199 | /***************************************************************************** |
200 | * | |
201 | * io operations. | |
202 | * | |
203 | */ | |
204 | ||
fee6eb50 JH |
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) | |
208 | { | |
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; | |
212 | ||
213 | CLOBINVRNT(env, obj, vvp_object_invariant(obj)); | |
214 | ||
215 | CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end); | |
216 | ||
217 | memset(&vio->vui_link, 0, sizeof(vio->vui_link)); | |
218 | ||
219 | if (vio->vui_fd && (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) { | |
220 | descr->cld_mode = CLM_GROUP; | |
98eae5e7 | 221 | descr->cld_gid = vio->vui_fd->fd_grouplock.lg_gid; |
fee6eb50 JH |
222 | } else { |
223 | descr->cld_mode = mode; | |
224 | } | |
225 | descr->cld_obj = obj; | |
226 | descr->cld_start = start; | |
227 | descr->cld_end = end; | |
228 | descr->cld_enq_flags = enqflags; | |
229 | ||
230 | cl_io_lock_add(env, io, &vio->vui_link); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io, | |
235 | __u32 enqflags, enum cl_lock_mode mode, | |
236 | loff_t start, loff_t end) | |
237 | { | |
238 | struct cl_object *obj = io->ci_obj; | |
239 | ||
240 | return vvp_io_one_lock_index(env, io, enqflags, mode, | |
241 | cl_index(obj, start), cl_index(obj, end)); | |
242 | } | |
243 | ||
77605e41 JX |
244 | static int vvp_io_write_iter_init(const struct lu_env *env, |
245 | const struct cl_io_slice *ios) | |
246 | { | |
e0a8144b | 247 | struct vvp_io *vio = cl2vvp_io(env, ios); |
77605e41 | 248 | |
e0a8144b JH |
249 | cl_page_list_init(&vio->u.write.vui_queue); |
250 | vio->u.write.vui_written = 0; | |
251 | vio->u.write.vui_from = 0; | |
252 | vio->u.write.vui_to = PAGE_SIZE; | |
77605e41 JX |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static void vvp_io_write_iter_fini(const struct lu_env *env, | |
258 | const struct cl_io_slice *ios) | |
259 | { | |
e0a8144b | 260 | struct vvp_io *vio = cl2vvp_io(env, ios); |
77605e41 | 261 | |
e0a8144b | 262 | LASSERT(vio->u.write.vui_queue.pl_nr == 0); |
77605e41 JX |
263 | } |
264 | ||
d7e09d03 PT |
265 | static int vvp_io_fault_iter_init(const struct lu_env *env, |
266 | const struct cl_io_slice *ios) | |
267 | { | |
268 | struct vvp_io *vio = cl2vvp_io(env, ios); | |
8c7b0e1a | 269 | struct inode *inode = vvp_object_inode(ios->cis_obj); |
d7e09d03 | 270 | |
e0a8144b | 271 | LASSERT(inode == file_inode(vio->vui_fd->fd_file)); |
46c360f9 | 272 | vio->u.fault.ft_mtime = inode->i_mtime.tv_sec; |
d7e09d03 PT |
273 | return 0; |
274 | } | |
275 | ||
276 | static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios) | |
277 | { | |
278 | struct cl_io *io = ios->cis_io; | |
279 | struct cl_object *obj = io->ci_obj; | |
e0a8144b | 280 | struct vvp_io *vio = cl2vvp_io(env, ios); |
1b1594da | 281 | struct inode *inode = vvp_object_inode(obj); |
d7e09d03 | 282 | |
8c7b0e1a | 283 | CLOBINVRNT(env, obj, vvp_object_invariant(obj)); |
d7e09d03 | 284 | |
5ea17d6c JL |
285 | CDEBUG(D_VFSTRACE, DFID |
286 | " ignore/verify layout %d/%d, layout version %d restore needed %d\n", | |
287 | PFID(lu_object_fid(&obj->co_lu)), | |
288 | io->ci_ignore_layout, io->ci_verify_layout, | |
e0a8144b | 289 | vio->vui_layout_gen, io->ci_restore_needed); |
5ea17d6c JL |
290 | |
291 | if (io->ci_restore_needed == 1) { | |
292 | int rc; | |
293 | ||
294 | /* file was detected release, we need to restore it | |
295 | * before finishing the io | |
296 | */ | |
1b1594da | 297 | rc = ll_layout_restore(inode, 0, OBD_OBJECT_EOF); |
5ea17d6c | 298 | /* if restore registration failed, no restart, |
c0894c6c OD |
299 | * we will return -ENODATA |
300 | */ | |
5ea17d6c JL |
301 | /* The layout will change after restore, so we need to |
302 | * block on layout lock hold by the MDT | |
303 | * as MDT will not send new layout in lvb (see LU-3124) | |
304 | * we have to explicitly fetch it, all this will be done | |
305 | * by ll_layout_refresh() | |
306 | */ | |
307 | if (rc == 0) { | |
308 | io->ci_restore_needed = 0; | |
309 | io->ci_need_restart = 1; | |
310 | io->ci_verify_layout = 1; | |
311 | } else { | |
312 | io->ci_restore_needed = 1; | |
313 | io->ci_need_restart = 0; | |
314 | io->ci_verify_layout = 0; | |
315 | io->ci_result = rc; | |
316 | } | |
317 | } | |
d7e09d03 PT |
318 | |
319 | if (!io->ci_ignore_layout && io->ci_verify_layout) { | |
320 | __u32 gen = 0; | |
321 | ||
322 | /* check layout version */ | |
1b1594da | 323 | ll_layout_refresh(inode, &gen); |
e0a8144b | 324 | io->ci_need_restart = vio->vui_layout_gen != gen; |
5ea17d6c JL |
325 | if (io->ci_need_restart) { |
326 | CDEBUG(D_VFSTRACE, | |
327 | DFID" layout changed from %d to %d.\n", | |
328 | PFID(lu_object_fid(&obj->co_lu)), | |
e0a8144b | 329 | vio->vui_layout_gen, gen); |
c0894c6c | 330 | /* today successful restore is the only possible case */ |
5ea17d6c | 331 | /* restore was done, clear restoring state */ |
8c7b0e1a | 332 | ll_i2info(vvp_object_inode(obj))->lli_flags &= |
5ea17d6c JL |
333 | ~LLIF_FILE_RESTORING; |
334 | } | |
d7e09d03 PT |
335 | } |
336 | } | |
337 | ||
338 | static void vvp_io_fault_fini(const struct lu_env *env, | |
339 | const struct cl_io_slice *ios) | |
340 | { | |
341 | struct cl_io *io = ios->cis_io; | |
342 | struct cl_page *page = io->u.ci_fault.ft_page; | |
343 | ||
8c7b0e1a | 344 | CLOBINVRNT(env, io->ci_obj, vvp_object_invariant(io->ci_obj)); |
d7e09d03 | 345 | |
6e16818b | 346 | if (page) { |
d7e09d03 PT |
347 | lu_ref_del(&page->cp_reference, "fault", io); |
348 | cl_page_put(env, page); | |
349 | io->u.ci_fault.ft_page = NULL; | |
350 | } | |
351 | vvp_io_fini(env, ios); | |
352 | } | |
353 | ||
2d95f10e | 354 | static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma) |
d7e09d03 PT |
355 | { |
356 | /* | |
357 | * we only want to hold PW locks if the mmap() can generate | |
358 | * writes back to the file and that only happens in shared | |
359 | * writable vmas | |
360 | */ | |
361 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) | |
362 | return CLM_WRITE; | |
363 | return CLM_READ; | |
364 | } | |
365 | ||
366 | static int vvp_mmap_locks(const struct lu_env *env, | |
10cdef73 | 367 | struct vvp_io *vio, struct cl_io *io) |
d7e09d03 | 368 | { |
9acc4500 | 369 | struct vvp_thread_info *cti = vvp_env_info(env); |
d7e09d03 PT |
370 | struct mm_struct *mm = current->mm; |
371 | struct vm_area_struct *vma; | |
9acc4500 | 372 | struct cl_lock_descr *descr = &cti->vti_descr; |
d7e09d03 PT |
373 | ldlm_policy_data_t policy; |
374 | unsigned long addr; | |
d7e09d03 | 375 | ssize_t count; |
06563b56 | 376 | int result = 0; |
b42b15fd AV |
377 | struct iov_iter i; |
378 | struct iovec iov; | |
d7e09d03 PT |
379 | |
380 | LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); | |
381 | ||
e0a8144b | 382 | if (!vio->vui_iter) /* nfs or loop back device write */ |
0a3bdb00 | 383 | return 0; |
d7e09d03 PT |
384 | |
385 | /* No MM (e.g. NFS)? No vmas too. */ | |
6e16818b | 386 | if (!mm) |
0a3bdb00 | 387 | return 0; |
d7e09d03 | 388 | |
e0a8144b | 389 | iov_for_each(iov, i, *vio->vui_iter) { |
b42b15fd AV |
390 | addr = (unsigned long)iov.iov_base; |
391 | count = iov.iov_len; | |
d7e09d03 PT |
392 | if (count == 0) |
393 | continue; | |
394 | ||
616387e8 OD |
395 | count += addr & (~PAGE_MASK); |
396 | addr &= PAGE_MASK; | |
d7e09d03 PT |
397 | |
398 | down_read(&mm->mmap_sem); | |
a58a38ac | 399 | while ((vma = our_vma(mm, addr, count)) != NULL) { |
2a8a3597 | 400 | struct inode *inode = file_inode(vma->vm_file); |
d7e09d03 PT |
401 | int flags = CEF_MUST; |
402 | ||
403 | if (ll_file_nolock(vma->vm_file)) { | |
404 | /* | |
06563b56 | 405 | * For no lock case is not allowed for mmap |
d7e09d03 | 406 | */ |
06563b56 JX |
407 | result = -EINVAL; |
408 | break; | |
d7e09d03 PT |
409 | } |
410 | ||
411 | /* | |
412 | * XXX: Required lock mode can be weakened: CIT_WRITE | |
413 | * io only ever reads user level buffer, and CIT_READ | |
414 | * only writes on it. | |
415 | */ | |
416 | policy_from_vma(&policy, vma, addr, count); | |
417 | descr->cld_mode = vvp_mode_from_vma(vma); | |
418 | descr->cld_obj = ll_i2info(inode)->lli_clob; | |
419 | descr->cld_start = cl_index(descr->cld_obj, | |
420 | policy.l_extent.start); | |
421 | descr->cld_end = cl_index(descr->cld_obj, | |
422 | policy.l_extent.end); | |
423 | descr->cld_enq_flags = flags; | |
424 | result = cl_io_lock_alloc_add(env, io, descr); | |
425 | ||
426 | CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n", | |
427 | descr->cld_mode, descr->cld_start, | |
428 | descr->cld_end); | |
429 | ||
06563b56 JX |
430 | if (result < 0) |
431 | break; | |
d7e09d03 PT |
432 | |
433 | if (vma->vm_end - addr >= count) | |
434 | break; | |
435 | ||
436 | count -= vma->vm_end - addr; | |
437 | addr = vma->vm_end; | |
438 | } | |
439 | up_read(&mm->mmap_sem); | |
06563b56 JX |
440 | if (result < 0) |
441 | break; | |
d7e09d03 | 442 | } |
06563b56 | 443 | return result; |
d7e09d03 PT |
444 | } |
445 | ||
fee6eb50 JH |
446 | static void vvp_io_advance(const struct lu_env *env, |
447 | const struct cl_io_slice *ios, | |
448 | size_t nob) | |
449 | { | |
fee6eb50 | 450 | struct cl_object *obj = ios->cis_io->ci_obj; |
82c156f8 | 451 | struct vvp_io *vio = cl2vvp_io(env, ios); |
fee6eb50 JH |
452 | CLOBINVRNT(env, obj, vvp_object_invariant(obj)); |
453 | ||
fee6eb50 JH |
454 | iov_iter_reexpand(vio->vui_iter, vio->vui_tot_count -= nob); |
455 | } | |
456 | ||
457 | static void vvp_io_update_iov(const struct lu_env *env, | |
458 | struct vvp_io *vio, struct cl_io *io) | |
459 | { | |
460 | size_t size = io->u.ci_rw.crw_count; | |
461 | ||
82c156f8 | 462 | if (!vio->vui_iter) |
fee6eb50 JH |
463 | return; |
464 | ||
465 | iov_iter_truncate(vio->vui_iter, size); | |
466 | } | |
467 | ||
d7e09d03 PT |
468 | static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io, |
469 | enum cl_lock_mode mode, loff_t start, loff_t end) | |
470 | { | |
e0a8144b | 471 | struct vvp_io *vio = vvp_env_io(env); |
d7e09d03 PT |
472 | int result; |
473 | int ast_flags = 0; | |
474 | ||
475 | LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); | |
d7e09d03 | 476 | |
e0a8144b | 477 | vvp_io_update_iov(env, vio, io); |
d7e09d03 PT |
478 | |
479 | if (io->u.ci_rw.crw_nonblock) | |
480 | ast_flags |= CEF_NONBLOCK; | |
e0a8144b | 481 | result = vvp_mmap_locks(env, vio, io); |
d7e09d03 | 482 | if (result == 0) |
10cdef73 | 483 | result = vvp_io_one_lock(env, io, ast_flags, mode, start, end); |
0a3bdb00 | 484 | return result; |
d7e09d03 PT |
485 | } |
486 | ||
487 | static int vvp_io_read_lock(const struct lu_env *env, | |
488 | const struct cl_io_slice *ios) | |
489 | { | |
4c309612 JX |
490 | struct cl_io *io = ios->cis_io; |
491 | struct cl_io_rw_common *rd = &io->u.ci_rd.rd; | |
d7e09d03 PT |
492 | int result; |
493 | ||
4c309612 JX |
494 | result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos, |
495 | rd->crw_pos + rd->crw_count - 1); | |
496 | ||
0a3bdb00 | 497 | return result; |
d7e09d03 PT |
498 | } |
499 | ||
500 | static int vvp_io_fault_lock(const struct lu_env *env, | |
501 | const struct cl_io_slice *ios) | |
502 | { | |
503 | struct cl_io *io = ios->cis_io; | |
504 | struct vvp_io *vio = cl2vvp_io(env, ios); | |
505 | /* | |
506 | * XXX LDLM_FL_CBPENDING | |
507 | */ | |
10cdef73 JH |
508 | return vvp_io_one_lock_index(env, |
509 | io, 0, | |
510 | vvp_mode_from_vma(vio->u.fault.ft_vma), | |
511 | io->u.ci_fault.ft_index, | |
512 | io->u.ci_fault.ft_index); | |
d7e09d03 PT |
513 | } |
514 | ||
515 | static int vvp_io_write_lock(const struct lu_env *env, | |
516 | const struct cl_io_slice *ios) | |
517 | { | |
518 | struct cl_io *io = ios->cis_io; | |
519 | loff_t start; | |
520 | loff_t end; | |
521 | ||
522 | if (io->u.ci_wr.wr_append) { | |
523 | start = 0; | |
524 | end = OBD_OBJECT_EOF; | |
525 | } else { | |
526 | start = io->u.ci_wr.wr.crw_pos; | |
527 | end = start + io->u.ci_wr.wr.crw_count - 1; | |
528 | } | |
529 | return vvp_io_rw_lock(env, io, CLM_WRITE, start, end); | |
530 | } | |
531 | ||
532 | static int vvp_io_setattr_iter_init(const struct lu_env *env, | |
533 | const struct cl_io_slice *ios) | |
534 | { | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /** | |
e0a8144b | 539 | * Implementation of cl_io_operations::vio_lock() method for CIT_SETATTR io. |
d7e09d03 PT |
540 | * |
541 | * Handles "lockless io" mode when extent locking is done by server. | |
542 | */ | |
543 | static int vvp_io_setattr_lock(const struct lu_env *env, | |
544 | const struct cl_io_slice *ios) | |
545 | { | |
d7e09d03 PT |
546 | struct cl_io *io = ios->cis_io; |
547 | __u64 new_size; | |
548 | __u32 enqflags = 0; | |
549 | ||
550 | if (cl_io_is_trunc(io)) { | |
551 | new_size = io->u.ci_setattr.sa_attr.lvb_size; | |
552 | if (new_size == 0) | |
553 | enqflags = CEF_DISCARD_DATA; | |
554 | } else { | |
555 | if ((io->u.ci_setattr.sa_attr.lvb_mtime >= | |
556 | io->u.ci_setattr.sa_attr.lvb_ctime) || | |
557 | (io->u.ci_setattr.sa_attr.lvb_atime >= | |
558 | io->u.ci_setattr.sa_attr.lvb_ctime)) | |
559 | return 0; | |
560 | new_size = 0; | |
561 | } | |
e0a8144b | 562 | |
10cdef73 | 563 | return vvp_io_one_lock(env, io, enqflags, CLM_WRITE, |
d7e09d03 PT |
564 | new_size, OBD_OBJECT_EOF); |
565 | } | |
566 | ||
567 | static int vvp_do_vmtruncate(struct inode *inode, size_t size) | |
568 | { | |
569 | int result; | |
570 | /* | |
571 | * Only ll_inode_size_lock is taken at this level. | |
572 | */ | |
573 | ll_inode_size_lock(inode); | |
574 | result = inode_newsize_ok(inode, size); | |
575 | if (result < 0) { | |
576 | ll_inode_size_unlock(inode); | |
577 | return result; | |
578 | } | |
579 | truncate_setsize(inode, size); | |
580 | ll_inode_size_unlock(inode); | |
581 | return result; | |
582 | } | |
583 | ||
584 | static int vvp_io_setattr_trunc(const struct lu_env *env, | |
585 | const struct cl_io_slice *ios, | |
586 | struct inode *inode, loff_t size) | |
587 | { | |
588 | inode_dio_wait(inode); | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static int vvp_io_setattr_time(const struct lu_env *env, | |
593 | const struct cl_io_slice *ios) | |
594 | { | |
595 | struct cl_io *io = ios->cis_io; | |
596 | struct cl_object *obj = io->ci_obj; | |
9acc4500 | 597 | struct cl_attr *attr = vvp_env_thread_attr(env); |
d7e09d03 PT |
598 | int result; |
599 | unsigned valid = CAT_CTIME; | |
600 | ||
601 | cl_object_attr_lock(obj); | |
602 | attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime; | |
603 | if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) { | |
604 | attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime; | |
605 | valid |= CAT_ATIME; | |
606 | } | |
607 | if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) { | |
608 | attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime; | |
609 | valid |= CAT_MTIME; | |
610 | } | |
611 | result = cl_object_attr_set(env, obj, attr, valid); | |
612 | cl_object_attr_unlock(obj); | |
613 | ||
614 | return result; | |
615 | } | |
616 | ||
617 | static int vvp_io_setattr_start(const struct lu_env *env, | |
618 | const struct cl_io_slice *ios) | |
619 | { | |
620 | struct cl_io *io = ios->cis_io; | |
8c7b0e1a | 621 | struct inode *inode = vvp_object_inode(io->ci_obj); |
5dd16419 | 622 | int result = 0; |
d7e09d03 | 623 | |
5955102c | 624 | inode_lock(inode); |
d7e09d03 | 625 | if (cl_io_is_trunc(io)) |
5dd16419 JX |
626 | result = vvp_io_setattr_trunc(env, ios, inode, |
627 | io->u.ci_setattr.sa_attr.lvb_size); | |
628 | if (result == 0) | |
629 | result = vvp_io_setattr_time(env, ios); | |
630 | return result; | |
d7e09d03 PT |
631 | } |
632 | ||
633 | static void vvp_io_setattr_end(const struct lu_env *env, | |
634 | const struct cl_io_slice *ios) | |
635 | { | |
636 | struct cl_io *io = ios->cis_io; | |
8c7b0e1a | 637 | struct inode *inode = vvp_object_inode(io->ci_obj); |
d7e09d03 | 638 | |
81e053c7 | 639 | if (cl_io_is_trunc(io)) |
d7e09d03 | 640 | /* Truncate in memory pages - they must be clean pages |
c0894c6c OD |
641 | * because osc has already notified to destroy osc_extents. |
642 | */ | |
d7e09d03 | 643 | vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size); |
81e053c7 | 644 | |
5955102c | 645 | inode_unlock(inode); |
d7e09d03 PT |
646 | } |
647 | ||
648 | static void vvp_io_setattr_fini(const struct lu_env *env, | |
649 | const struct cl_io_slice *ios) | |
650 | { | |
651 | vvp_io_fini(env, ios); | |
652 | } | |
653 | ||
d7e09d03 PT |
654 | static int vvp_io_read_start(const struct lu_env *env, |
655 | const struct cl_io_slice *ios) | |
656 | { | |
657 | struct vvp_io *vio = cl2vvp_io(env, ios); | |
d7e09d03 PT |
658 | struct cl_io *io = ios->cis_io; |
659 | struct cl_object *obj = io->ci_obj; | |
8c7b0e1a | 660 | struct inode *inode = vvp_object_inode(obj); |
e0a8144b | 661 | struct file *file = vio->vui_fd->fd_file; |
d7e09d03 PT |
662 | |
663 | int result; | |
664 | loff_t pos = io->u.ci_rd.rd.crw_pos; | |
665 | long cnt = io->u.ci_rd.rd.crw_count; | |
e0a8144b | 666 | long tot = vio->vui_tot_count; |
d7e09d03 PT |
667 | int exceed = 0; |
668 | ||
8c7b0e1a | 669 | CLOBINVRNT(env, obj, vvp_object_invariant(obj)); |
d7e09d03 PT |
670 | |
671 | CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt); | |
672 | ||
673 | if (!can_populate_pages(env, io, inode)) | |
674 | return 0; | |
675 | ||
fee6eb50 | 676 | result = vvp_prep_size(env, obj, io, pos, tot, &exceed); |
d7e09d03 PT |
677 | if (result != 0) |
678 | return result; | |
679 | else if (exceed != 0) | |
680 | goto out; | |
681 | ||
682 | LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, | |
e15ba45d OD |
683 | "Read ino %lu, %lu bytes, offset %lld, size %llu\n", |
684 | inode->i_ino, cnt, pos, i_size_read(inode)); | |
d7e09d03 PT |
685 | |
686 | /* turn off the kernel's read-ahead */ | |
e0a8144b | 687 | vio->vui_fd->fd_file->f_ra.ra_pages = 0; |
d7e09d03 PT |
688 | |
689 | /* initialize read-ahead window once per syscall */ | |
e0a8144b JH |
690 | if (!vio->vui_ra_valid) { |
691 | vio->vui_ra_valid = true; | |
692 | vio->vui_ra_start = cl_index(obj, pos); | |
5f479924 | 693 | vio->vui_ra_count = cl_index(obj, tot + PAGE_SIZE - 1); |
bc4320a9 | 694 | ll_ras_enter(file); |
d7e09d03 PT |
695 | } |
696 | ||
697 | /* BUG: 5972 */ | |
698 | file_accessed(file); | |
82c156f8 AV |
699 | LASSERT(vio->vui_iocb->ki_pos == pos); |
700 | result = generic_file_read_iter(vio->vui_iocb, vio->vui_iter); | |
d7e09d03 PT |
701 | |
702 | out: | |
703 | if (result >= 0) { | |
704 | if (result < cnt) | |
705 | io->ci_continue = 0; | |
706 | io->ci_nob += result; | |
707 | ll_rw_stats_tally(ll_i2sbi(inode), current->pid, | |
e0a8144b | 708 | vio->vui_fd, pos, result, READ); |
d7e09d03 PT |
709 | result = 0; |
710 | } | |
711 | return result; | |
712 | } | |
713 | ||
77605e41 JX |
714 | static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io, |
715 | struct cl_page_list *plist, int from, int to) | |
716 | { | |
717 | struct cl_2queue *queue = &io->ci_queue; | |
718 | struct cl_page *page; | |
719 | unsigned int bytes = 0; | |
720 | int rc = 0; | |
721 | ||
722 | if (plist->pl_nr == 0) | |
723 | return 0; | |
724 | ||
c11599b8 | 725 | if (from > 0 || to != PAGE_SIZE) { |
77605e41 | 726 | page = cl_page_list_first(plist); |
c11599b8 JX |
727 | if (plist->pl_nr == 1) { |
728 | cl_page_clip(env, page, from, to); | |
c11599b8 | 729 | } else { |
902a34ad LD |
730 | if (from > 0) |
731 | cl_page_clip(env, page, from, PAGE_SIZE); | |
732 | if (to != PAGE_SIZE) { | |
733 | page = cl_page_list_last(plist); | |
734 | cl_page_clip(env, page, 0, to); | |
735 | } | |
736 | } | |
c11599b8 | 737 | } |
77605e41 JX |
738 | |
739 | cl_2queue_init(queue); | |
740 | cl_page_list_splice(plist, &queue->c2_qin); | |
741 | rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0); | |
742 | ||
743 | /* plist is not sorted any more */ | |
744 | cl_page_list_splice(&queue->c2_qin, plist); | |
745 | cl_page_list_splice(&queue->c2_qout, plist); | |
746 | cl_2queue_fini(env, queue); | |
747 | ||
748 | if (rc == 0) { | |
749 | /* calculate bytes */ | |
750 | bytes = plist->pl_nr << PAGE_SHIFT; | |
751 | bytes -= from + PAGE_SIZE - to; | |
752 | ||
753 | while (plist->pl_nr > 0) { | |
754 | page = cl_page_list_first(plist); | |
755 | cl_page_list_del(env, plist, page); | |
756 | ||
757 | cl_page_clip(env, page, 0, PAGE_SIZE); | |
758 | ||
7addf402 | 759 | SetPageUptodate(cl_page_vmpage(page)); |
77605e41 JX |
760 | cl_page_disown(env, io, page); |
761 | ||
762 | /* held in ll_cl_init() */ | |
763 | lu_ref_del(&page->cp_reference, "cl_io", io); | |
764 | cl_page_put(env, page); | |
765 | } | |
766 | } | |
767 | ||
768 | return bytes > 0 ? bytes : rc; | |
769 | } | |
770 | ||
771 | static void write_commit_callback(const struct lu_env *env, struct cl_io *io, | |
772 | struct cl_page *page) | |
773 | { | |
3a52f803 | 774 | struct vvp_page *vpg; |
7addf402 JX |
775 | struct page *vmpage = page->cp_vmpage; |
776 | struct cl_object *clob = cl_io_top(io)->ci_obj; | |
77605e41 JX |
777 | |
778 | SetPageUptodate(vmpage); | |
779 | set_page_dirty(vmpage); | |
7addf402 | 780 | |
3a52f803 JH |
781 | vpg = cl2vvp_page(cl_object_page_slice(clob, page)); |
782 | vvp_write_pending(cl2vvp(clob), vpg); | |
77605e41 JX |
783 | |
784 | cl_page_disown(env, io, page); | |
785 | ||
786 | /* held in ll_cl_init() */ | |
787 | lu_ref_del(&page->cp_reference, "cl_io", io); | |
788 | cl_page_put(env, page); | |
789 | } | |
790 | ||
791 | /* make sure the page list is contiguous */ | |
7addf402 JX |
792 | static bool page_list_sanity_check(struct cl_object *obj, |
793 | struct cl_page_list *plist) | |
77605e41 JX |
794 | { |
795 | struct cl_page *page; | |
796 | pgoff_t index = CL_PAGE_EOF; | |
797 | ||
798 | cl_page_list_for_each(page, plist) { | |
3a52f803 | 799 | struct vvp_page *vpg = cl_object_page_slice(obj, page); |
7addf402 | 800 | |
77605e41 | 801 | if (index == CL_PAGE_EOF) { |
3a52f803 | 802 | index = vvp_index(vpg); |
77605e41 JX |
803 | continue; |
804 | } | |
805 | ||
806 | ++index; | |
3a52f803 | 807 | if (index == vvp_index(vpg)) |
77605e41 JX |
808 | continue; |
809 | ||
810 | return false; | |
811 | } | |
812 | return true; | |
813 | } | |
814 | ||
815 | /* Return how many bytes have queued or written */ | |
816 | int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io) | |
817 | { | |
818 | struct cl_object *obj = io->ci_obj; | |
8c7b0e1a | 819 | struct inode *inode = vvp_object_inode(obj); |
e0a8144b JH |
820 | struct vvp_io *vio = vvp_env_io(env); |
821 | struct cl_page_list *queue = &vio->u.write.vui_queue; | |
77605e41 JX |
822 | struct cl_page *page; |
823 | int rc = 0; | |
824 | int bytes = 0; | |
e0a8144b | 825 | unsigned int npages = vio->u.write.vui_queue.pl_nr; |
77605e41 JX |
826 | |
827 | if (npages == 0) | |
828 | return 0; | |
829 | ||
830 | CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n", | |
e0a8144b | 831 | npages, vio->u.write.vui_from, vio->u.write.vui_to); |
77605e41 | 832 | |
7addf402 | 833 | LASSERT(page_list_sanity_check(obj, queue)); |
77605e41 JX |
834 | |
835 | /* submit IO with async write */ | |
836 | rc = cl_io_commit_async(env, io, queue, | |
e0a8144b | 837 | vio->u.write.vui_from, vio->u.write.vui_to, |
77605e41 JX |
838 | write_commit_callback); |
839 | npages -= queue->pl_nr; /* already committed pages */ | |
840 | if (npages > 0) { | |
841 | /* calculate how many bytes were written */ | |
842 | bytes = npages << PAGE_SHIFT; | |
843 | ||
844 | /* first page */ | |
e0a8144b | 845 | bytes -= vio->u.write.vui_from; |
77605e41 | 846 | if (queue->pl_nr == 0) /* last page */ |
e0a8144b | 847 | bytes -= PAGE_SIZE - vio->u.write.vui_to; |
77605e41 JX |
848 | LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages); |
849 | ||
e0a8144b | 850 | vio->u.write.vui_written += bytes; |
77605e41 JX |
851 | |
852 | CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n", | |
e0a8144b | 853 | npages, bytes, vio->u.write.vui_written); |
77605e41 JX |
854 | |
855 | /* the first page must have been written. */ | |
e0a8144b | 856 | vio->u.write.vui_from = 0; |
77605e41 | 857 | } |
7addf402 | 858 | LASSERT(page_list_sanity_check(obj, queue)); |
77605e41 JX |
859 | LASSERT(ergo(rc == 0, queue->pl_nr == 0)); |
860 | ||
861 | /* out of quota, try sync write */ | |
862 | if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) { | |
863 | rc = vvp_io_commit_sync(env, io, queue, | |
e0a8144b JH |
864 | vio->u.write.vui_from, |
865 | vio->u.write.vui_to); | |
77605e41 | 866 | if (rc > 0) { |
e0a8144b | 867 | vio->u.write.vui_written += rc; |
77605e41 JX |
868 | rc = 0; |
869 | } | |
870 | } | |
871 | ||
872 | /* update inode size */ | |
d2995737 | 873 | ll_merge_attr(env, inode); |
77605e41 JX |
874 | |
875 | /* Now the pages in queue were failed to commit, discard them | |
876 | * unless they were dirtied before. | |
877 | */ | |
878 | while (queue->pl_nr > 0) { | |
879 | page = cl_page_list_first(queue); | |
880 | cl_page_list_del(env, queue, page); | |
881 | ||
7addf402 | 882 | if (!PageDirty(cl_page_vmpage(page))) |
77605e41 JX |
883 | cl_page_discard(env, io, page); |
884 | ||
885 | cl_page_disown(env, io, page); | |
886 | ||
887 | /* held in ll_cl_init() */ | |
888 | lu_ref_del(&page->cp_reference, "cl_io", io); | |
889 | cl_page_put(env, page); | |
890 | } | |
891 | cl_page_list_fini(env, queue); | |
892 | ||
893 | return rc; | |
894 | } | |
895 | ||
d7e09d03 PT |
896 | static int vvp_io_write_start(const struct lu_env *env, |
897 | const struct cl_io_slice *ios) | |
898 | { | |
e0a8144b | 899 | struct vvp_io *vio = cl2vvp_io(env, ios); |
d7e09d03 PT |
900 | struct cl_io *io = ios->cis_io; |
901 | struct cl_object *obj = io->ci_obj; | |
8c7b0e1a | 902 | struct inode *inode = vvp_object_inode(obj); |
d7e09d03 PT |
903 | ssize_t result = 0; |
904 | loff_t pos = io->u.ci_wr.wr.crw_pos; | |
905 | size_t cnt = io->u.ci_wr.wr.crw_count; | |
906 | ||
d7e09d03 PT |
907 | if (!can_populate_pages(env, io, inode)) |
908 | return 0; | |
909 | ||
910 | if (cl_io_is_append(io)) { | |
911 | /* | |
912 | * PARALLEL IO This has to be changed for parallel IO doing | |
913 | * out-of-order writes. | |
914 | */ | |
06563b56 | 915 | ll_merge_attr(env, inode); |
7551b8b5 NC |
916 | pos = i_size_read(inode); |
917 | io->u.ci_wr.wr.crw_pos = pos; | |
e0a8144b | 918 | vio->vui_iocb->ki_pos = pos; |
74c0da19 | 919 | } else { |
e0a8144b | 920 | LASSERT(vio->vui_iocb->ki_pos == pos); |
d7e09d03 PT |
921 | } |
922 | ||
923 | CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt); | |
924 | ||
e0a8144b | 925 | if (!vio->vui_iter) /* from a temp io in ll_cl_init(). */ |
d7e09d03 PT |
926 | result = 0; |
927 | else | |
e0a8144b | 928 | result = generic_file_write_iter(vio->vui_iocb, vio->vui_iter); |
b42b15fd | 929 | |
d7e09d03 | 930 | if (result > 0) { |
77605e41 | 931 | result = vvp_io_write_commit(env, io); |
e0a8144b JH |
932 | if (vio->u.write.vui_written > 0) { |
933 | result = vio->u.write.vui_written; | |
77605e41 JX |
934 | io->ci_nob += result; |
935 | ||
936 | CDEBUG(D_VFSTRACE, "write: nob %zd, result: %zd\n", | |
937 | io->ci_nob, result); | |
938 | } | |
939 | } | |
940 | if (result > 0) { | |
941 | struct ll_inode_info *lli = ll_i2info(inode); | |
942 | ||
943 | spin_lock(&lli->lli_lock); | |
944 | lli->lli_flags |= LLIF_DATA_MODIFIED; | |
945 | spin_unlock(&lli->lli_lock); | |
946 | ||
d7e09d03 PT |
947 | if (result < cnt) |
948 | io->ci_continue = 0; | |
d7e09d03 | 949 | ll_rw_stats_tally(ll_i2sbi(inode), current->pid, |
e0a8144b | 950 | vio->vui_fd, pos, result, WRITE); |
d7e09d03 PT |
951 | result = 0; |
952 | } | |
0a3bdb00 | 953 | return result; |
d7e09d03 PT |
954 | } |
955 | ||
956 | static int vvp_io_kernel_fault(struct vvp_fault_io *cfio) | |
957 | { | |
10cdef73 | 958 | struct vm_fault *vmf = cfio->ft_vmf; |
d7e09d03 | 959 | |
10cdef73 JH |
960 | cfio->ft_flags = filemap_fault(cfio->ft_vma, vmf); |
961 | cfio->ft_flags_valid = 1; | |
d7e09d03 PT |
962 | |
963 | if (vmf->page) { | |
aa3bee0d GKH |
964 | CDEBUG(D_PAGE, |
965 | "page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n", | |
966 | vmf->page, vmf->page->mapping, vmf->page->index, | |
967 | (long)vmf->page->flags, page_count(vmf->page), | |
968 | page_private(vmf->page), vmf->virtual_address); | |
10cdef73 | 969 | if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) { |
d7e09d03 | 970 | lock_page(vmf->page); |
10cdef73 | 971 | cfio->ft_flags |= VM_FAULT_LOCKED; |
d7e09d03 PT |
972 | } |
973 | ||
974 | cfio->ft_vmpage = vmf->page; | |
975 | return 0; | |
976 | } | |
977 | ||
10cdef73 | 978 | if (cfio->ft_flags & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) { |
d7e09d03 PT |
979 | CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address); |
980 | return -EFAULT; | |
981 | } | |
982 | ||
10cdef73 | 983 | if (cfio->ft_flags & VM_FAULT_OOM) { |
d7e09d03 PT |
984 | CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address); |
985 | return -ENOMEM; | |
986 | } | |
987 | ||
10cdef73 | 988 | if (cfio->ft_flags & VM_FAULT_RETRY) |
d7e09d03 PT |
989 | return -EAGAIN; |
990 | ||
10cdef73 | 991 | CERROR("Unknown error in page fault %d!\n", cfio->ft_flags); |
d7e09d03 PT |
992 | return -EINVAL; |
993 | } | |
994 | ||
77605e41 JX |
995 | static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io, |
996 | struct cl_page *page) | |
997 | { | |
3a52f803 | 998 | struct vvp_page *vpg; |
7addf402 | 999 | struct cl_object *clob = cl_io_top(io)->ci_obj; |
77605e41 | 1000 | |
7addf402 | 1001 | set_page_dirty(page->cp_vmpage); |
77605e41 | 1002 | |
3a52f803 JH |
1003 | vpg = cl2vvp_page(cl_object_page_slice(clob, page)); |
1004 | vvp_write_pending(cl2vvp(clob), vpg); | |
77605e41 JX |
1005 | } |
1006 | ||
d7e09d03 PT |
1007 | static int vvp_io_fault_start(const struct lu_env *env, |
1008 | const struct cl_io_slice *ios) | |
1009 | { | |
1010 | struct vvp_io *vio = cl2vvp_io(env, ios); | |
1011 | struct cl_io *io = ios->cis_io; | |
1012 | struct cl_object *obj = io->ci_obj; | |
8c7b0e1a | 1013 | struct inode *inode = vvp_object_inode(obj); |
d7e09d03 PT |
1014 | struct cl_fault_io *fio = &io->u.ci_fault; |
1015 | struct vvp_fault_io *cfio = &vio->u.fault; | |
1016 | loff_t offset; | |
1017 | int result = 0; | |
1018 | struct page *vmpage = NULL; | |
1019 | struct cl_page *page; | |
1020 | loff_t size; | |
77605e41 | 1021 | pgoff_t last_index; |
d7e09d03 PT |
1022 | |
1023 | if (fio->ft_executable && | |
46c360f9 | 1024 | inode->i_mtime.tv_sec != vio->u.fault.ft_mtime) |
d7e09d03 PT |
1025 | CWARN("binary "DFID |
1026 | " changed while waiting for the page fault lock\n", | |
1027 | PFID(lu_object_fid(&obj->co_lu))); | |
1028 | ||
1029 | /* offset of the last byte on the page */ | |
1030 | offset = cl_offset(obj, fio->ft_index + 1) - 1; | |
1031 | LASSERT(cl_index(obj, offset) == fio->ft_index); | |
fee6eb50 | 1032 | result = vvp_prep_size(env, obj, io, 0, offset + 1, NULL); |
d7e09d03 PT |
1033 | if (result != 0) |
1034 | return result; | |
1035 | ||
1036 | /* must return locked page */ | |
1037 | if (fio->ft_mkwrite) { | |
6e16818b | 1038 | LASSERT(cfio->ft_vmpage); |
d7e09d03 PT |
1039 | lock_page(cfio->ft_vmpage); |
1040 | } else { | |
1041 | result = vvp_io_kernel_fault(cfio); | |
1042 | if (result != 0) | |
1043 | return result; | |
1044 | } | |
1045 | ||
1046 | vmpage = cfio->ft_vmpage; | |
1047 | LASSERT(PageLocked(vmpage)); | |
1048 | ||
1049 | if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE)) | |
1050 | ll_invalidate_page(vmpage); | |
1051 | ||
1052 | size = i_size_read(inode); | |
1053 | /* Though we have already held a cl_lock upon this page, but | |
c0894c6c OD |
1054 | * it still can be truncated locally. |
1055 | */ | |
d7e09d03 PT |
1056 | if (unlikely((vmpage->mapping != inode->i_mapping) || |
1057 | (page_offset(vmpage) > size))) { | |
1058 | CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n"); | |
1059 | ||
1060 | /* return +1 to stop cl_io_loop() and ll_fault() will catch | |
c0894c6c OD |
1061 | * and retry. |
1062 | */ | |
b2952d62 | 1063 | result = 1; |
34e1f2bb | 1064 | goto out; |
d7e09d03 PT |
1065 | } |
1066 | ||
77605e41 JX |
1067 | last_index = cl_index(obj, size - 1); |
1068 | ||
557732ad | 1069 | if (fio->ft_mkwrite) { |
d7e09d03 PT |
1070 | /* |
1071 | * Capture the size while holding the lli_trunc_sem from above | |
1072 | * we want to make sure that we complete the mkwrite action | |
1073 | * while holding this lock. We need to make sure that we are | |
1074 | * not past the end of the file. | |
1075 | */ | |
d7e09d03 PT |
1076 | if (last_index < fio->ft_index) { |
1077 | CDEBUG(D_PAGE, | |
2d00bd17 JP |
1078 | "llite: mkwrite and truncate race happened: %p: 0x%lx 0x%lx\n", |
1079 | vmpage->mapping, fio->ft_index, last_index); | |
d7e09d03 PT |
1080 | /* |
1081 | * We need to return if we are | |
1082 | * passed the end of the file. This will propagate | |
1083 | * up the call stack to ll_page_mkwrite where | |
1084 | * we will return VM_FAULT_NOPAGE. Any non-negative | |
1085 | * value returned here will be silently | |
1086 | * converted to 0. If the vmpage->mapping is null | |
1087 | * the error code would be converted back to ENODATA | |
1088 | * in ll_page_mkwrite0. Thus we return -ENODATA | |
1089 | * to handle both cases | |
1090 | */ | |
34e1f2bb JL |
1091 | result = -ENODATA; |
1092 | goto out; | |
d7e09d03 PT |
1093 | } |
1094 | } | |
1095 | ||
1096 | page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE); | |
34e1f2bb JL |
1097 | if (IS_ERR(page)) { |
1098 | result = PTR_ERR(page); | |
1099 | goto out; | |
1100 | } | |
d7e09d03 PT |
1101 | |
1102 | /* if page is going to be written, we should add this page into cache | |
c0894c6c OD |
1103 | * earlier. |
1104 | */ | |
d7e09d03 PT |
1105 | if (fio->ft_mkwrite) { |
1106 | wait_on_page_writeback(vmpage); | |
77605e41 JX |
1107 | if (!PageDirty(vmpage)) { |
1108 | struct cl_page_list *plist = &io->ci_queue.c2_qin; | |
3a52f803 | 1109 | struct vvp_page *vpg = cl_object_page_slice(obj, page); |
77605e41 | 1110 | int to = PAGE_SIZE; |
d7e09d03 PT |
1111 | |
1112 | /* vvp_page_assume() calls wait_on_page_writeback(). */ | |
1113 | cl_page_assume(env, io, page); | |
1114 | ||
77605e41 JX |
1115 | cl_page_list_init(plist); |
1116 | cl_page_list_add(plist, page); | |
1117 | ||
1118 | /* size fixup */ | |
3a52f803 | 1119 | if (last_index == vvp_index(vpg)) |
77605e41 | 1120 | to = size & ~PAGE_MASK; |
d7e09d03 PT |
1121 | |
1122 | /* Do not set Dirty bit here so that in case IO is | |
1123 | * started before the page is really made dirty, we | |
c0894c6c OD |
1124 | * still have chance to detect it. |
1125 | */ | |
77605e41 JX |
1126 | result = cl_io_commit_async(env, io, plist, 0, to, |
1127 | mkwrite_commit_callback); | |
d7e09d03 | 1128 | LASSERT(cl_page_is_owned(page, io)); |
77605e41 | 1129 | cl_page_list_fini(env, plist); |
d7e09d03 PT |
1130 | |
1131 | vmpage = NULL; | |
1132 | if (result < 0) { | |
d7e09d03 PT |
1133 | cl_page_discard(env, io, page); |
1134 | cl_page_disown(env, io, page); | |
1135 | ||
1136 | cl_page_put(env, page); | |
1137 | ||
1138 | /* we're in big trouble, what can we do now? */ | |
1139 | if (result == -EDQUOT) | |
1140 | result = -ENOSPC; | |
34e1f2bb | 1141 | goto out; |
da5ecb4d | 1142 | } else { |
d7e09d03 | 1143 | cl_page_disown(env, io, page); |
da5ecb4d | 1144 | } |
d7e09d03 PT |
1145 | } |
1146 | } | |
1147 | ||
d7e09d03 PT |
1148 | /* |
1149 | * The ft_index is only used in the case of | |
1150 | * a mkwrite action. We need to check | |
1151 | * our assertions are correct, since | |
1152 | * we should have caught this above | |
1153 | */ | |
77605e41 JX |
1154 | LASSERT(!fio->ft_mkwrite || fio->ft_index <= last_index); |
1155 | if (fio->ft_index == last_index) | |
d7e09d03 PT |
1156 | /* |
1157 | * Last page is mapped partially. | |
1158 | */ | |
1159 | fio->ft_nob = size - cl_offset(obj, fio->ft_index); | |
1160 | else | |
1161 | fio->ft_nob = cl_page_size(obj); | |
1162 | ||
1163 | lu_ref_add(&page->cp_reference, "fault", io); | |
1164 | fio->ft_page = page; | |
d7e09d03 PT |
1165 | |
1166 | out: | |
1167 | /* return unlocked vmpage to avoid deadlocking */ | |
6e16818b | 1168 | if (vmpage) |
d7e09d03 | 1169 | unlock_page(vmpage); |
10cdef73 JH |
1170 | |
1171 | cfio->ft_flags &= ~VM_FAULT_LOCKED; | |
1172 | ||
d7e09d03 PT |
1173 | return result; |
1174 | } | |
1175 | ||
1176 | static int vvp_io_fsync_start(const struct lu_env *env, | |
1177 | const struct cl_io_slice *ios) | |
1178 | { | |
1179 | /* we should mark TOWRITE bit to each dirty page in radix tree to | |
1180 | * verify pages have been written, but this is difficult because of | |
c0894c6c OD |
1181 | * race. |
1182 | */ | |
d7e09d03 PT |
1183 | return 0; |
1184 | } | |
1185 | ||
1186 | static int vvp_io_read_page(const struct lu_env *env, | |
1187 | const struct cl_io_slice *ios, | |
1188 | const struct cl_page_slice *slice) | |
1189 | { | |
1190 | struct cl_io *io = ios->cis_io; | |
3a52f803 | 1191 | struct vvp_page *vpg = cl2vvp_page(slice); |
d7e09d03 | 1192 | struct cl_page *page = slice->cpl_page; |
8c7b0e1a | 1193 | struct inode *inode = vvp_object_inode(slice->cpl_obj); |
d7e09d03 | 1194 | struct ll_sb_info *sbi = ll_i2sbi(inode); |
e0a8144b | 1195 | struct ll_file_data *fd = cl2vvp_io(env, ios)->vui_fd; |
d7e09d03 | 1196 | struct ll_readahead_state *ras = &fd->fd_ras; |
d7e09d03 | 1197 | struct cl_2queue *queue = &io->ci_queue; |
d7e09d03 | 1198 | |
d7e09d03 PT |
1199 | if (sbi->ll_ra_info.ra_max_pages_per_file && |
1200 | sbi->ll_ra_info.ra_max_pages) | |
3a52f803 JH |
1201 | ras_update(sbi, inode, ras, vvp_index(vpg), |
1202 | vpg->vpg_defer_uptodate); | |
d7e09d03 | 1203 | |
3a52f803 JH |
1204 | if (vpg->vpg_defer_uptodate) { |
1205 | vpg->vpg_ra_used = 1; | |
d7e09d03 PT |
1206 | cl_page_export(env, page, 1); |
1207 | } | |
1208 | /* | |
1209 | * Add page into the queue even when it is marked uptodate above. | |
1210 | * this will unlock it automatically as part of cl_page_list_disown(). | |
1211 | */ | |
fd7444fe | 1212 | |
53f1a127 | 1213 | cl_page_list_add(&queue->c2_qin, page); |
d7e09d03 PT |
1214 | if (sbi->ll_ra_info.ra_max_pages_per_file && |
1215 | sbi->ll_ra_info.ra_max_pages) | |
fd7444fe | 1216 | ll_readahead(env, io, &queue->c2_qin, ras, |
3a52f803 | 1217 | vpg->vpg_defer_uptodate); |
d7e09d03 | 1218 | |
0a3bdb00 | 1219 | return 0; |
d7e09d03 PT |
1220 | } |
1221 | ||
e3c9078a | 1222 | static void vvp_io_end(const struct lu_env *env, const struct cl_io_slice *ios) |
fee6eb50 JH |
1223 | { |
1224 | CLOBINVRNT(env, ios->cis_io->ci_obj, | |
1225 | vvp_object_invariant(ios->cis_io->ci_obj)); | |
1226 | } | |
1227 | ||
d7e09d03 PT |
1228 | static const struct cl_io_operations vvp_io_ops = { |
1229 | .op = { | |
1230 | [CIT_READ] = { | |
bc4320a9 | 1231 | .cio_fini = vvp_io_fini, |
d7e09d03 PT |
1232 | .cio_lock = vvp_io_read_lock, |
1233 | .cio_start = vvp_io_read_start, | |
10cdef73 | 1234 | .cio_advance = vvp_io_advance, |
d7e09d03 PT |
1235 | }, |
1236 | [CIT_WRITE] = { | |
1237 | .cio_fini = vvp_io_fini, | |
77605e41 JX |
1238 | .cio_iter_init = vvp_io_write_iter_init, |
1239 | .cio_iter_fini = vvp_io_write_iter_fini, | |
d7e09d03 PT |
1240 | .cio_lock = vvp_io_write_lock, |
1241 | .cio_start = vvp_io_write_start, | |
10cdef73 | 1242 | .cio_advance = vvp_io_advance, |
d7e09d03 PT |
1243 | }, |
1244 | [CIT_SETATTR] = { | |
1245 | .cio_fini = vvp_io_setattr_fini, | |
1246 | .cio_iter_init = vvp_io_setattr_iter_init, | |
1247 | .cio_lock = vvp_io_setattr_lock, | |
1248 | .cio_start = vvp_io_setattr_start, | |
1249 | .cio_end = vvp_io_setattr_end | |
1250 | }, | |
1251 | [CIT_FAULT] = { | |
1252 | .cio_fini = vvp_io_fault_fini, | |
1253 | .cio_iter_init = vvp_io_fault_iter_init, | |
1254 | .cio_lock = vvp_io_fault_lock, | |
1255 | .cio_start = vvp_io_fault_start, | |
10cdef73 | 1256 | .cio_end = vvp_io_end, |
d7e09d03 PT |
1257 | }, |
1258 | [CIT_FSYNC] = { | |
1259 | .cio_start = vvp_io_fsync_start, | |
1260 | .cio_fini = vvp_io_fini | |
1261 | }, | |
1262 | [CIT_MISC] = { | |
1263 | .cio_fini = vvp_io_fini | |
1264 | } | |
1265 | }, | |
1266 | .cio_read_page = vvp_io_read_page, | |
d7e09d03 PT |
1267 | }; |
1268 | ||
1269 | int vvp_io_init(const struct lu_env *env, struct cl_object *obj, | |
1270 | struct cl_io *io) | |
1271 | { | |
1272 | struct vvp_io *vio = vvp_env_io(env); | |
8c7b0e1a | 1273 | struct inode *inode = vvp_object_inode(obj); |
d7e09d03 PT |
1274 | int result; |
1275 | ||
8c7b0e1a | 1276 | CLOBINVRNT(env, obj, vvp_object_invariant(obj)); |
d7e09d03 | 1277 | |
5ea17d6c JL |
1278 | CDEBUG(D_VFSTRACE, DFID |
1279 | " ignore/verify layout %d/%d, layout version %d restore needed %d\n", | |
1280 | PFID(lu_object_fid(&obj->co_lu)), | |
1281 | io->ci_ignore_layout, io->ci_verify_layout, | |
e0a8144b | 1282 | vio->vui_layout_gen, io->ci_restore_needed); |
5ea17d6c | 1283 | |
e0a8144b JH |
1284 | CL_IO_SLICE_CLEAN(vio, vui_cl); |
1285 | cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops); | |
1286 | vio->vui_ra_valid = false; | |
d7e09d03 PT |
1287 | result = 0; |
1288 | if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) { | |
1289 | size_t count; | |
1290 | struct ll_inode_info *lli = ll_i2info(inode); | |
1291 | ||
1292 | count = io->u.ci_rw.crw_count; | |
1293 | /* "If nbyte is 0, read() will return 0 and have no other | |
c0894c6c OD |
1294 | * results." -- Single Unix Spec |
1295 | */ | |
d7e09d03 PT |
1296 | if (count == 0) |
1297 | result = 1; | |
b42b15fd | 1298 | else |
e0a8144b | 1299 | vio->vui_tot_count = count; |
b42b15fd | 1300 | |
d7e09d03 PT |
1301 | /* for read/write, we store the jobid in the inode, and |
1302 | * it'll be fetched by osc when building RPC. | |
1303 | * | |
1304 | * it's not accurate if the file is shared by different | |
1305 | * jobs. | |
1306 | */ | |
1307 | lustre_get_jobid(lli->lli_jobid); | |
1308 | } else if (io->ci_type == CIT_SETATTR) { | |
1309 | if (!cl_io_is_trunc(io)) | |
1310 | io->ci_lockreq = CILR_MANDATORY; | |
1311 | } | |
1312 | ||
1313 | /* ignore layout change for generic CIT_MISC but not for glimpse. | |
1314 | * io context for glimpse must set ci_verify_layout to true, | |
c0894c6c OD |
1315 | * see cl_glimpse_size0() for details. |
1316 | */ | |
d7e09d03 PT |
1317 | if (io->ci_type == CIT_MISC && !io->ci_verify_layout) |
1318 | io->ci_ignore_layout = 1; | |
1319 | ||
1320 | /* Enqueue layout lock and get layout version. We need to do this | |
1321 | * even for operations requiring to open file, such as read and write, | |
c0894c6c OD |
1322 | * because it might not grant layout lock in IT_OPEN. |
1323 | */ | |
65fb55d1 | 1324 | if (result == 0 && !io->ci_ignore_layout) { |
e0a8144b | 1325 | result = ll_layout_refresh(inode, &vio->vui_layout_gen); |
65fb55d1 NY |
1326 | if (result == -ENOENT) |
1327 | /* If the inode on MDS has been removed, but the objects | |
1328 | * on OSTs haven't been destroyed (async unlink), layout | |
d0a0acc3 | 1329 | * fetch will return -ENOENT, we'd ignore this error |
c0894c6c OD |
1330 | * and continue with dirty flush. LU-3230. |
1331 | */ | |
65fb55d1 NY |
1332 | result = 0; |
1333 | if (result < 0) | |
1334 | CERROR("%s: refresh file layout " DFID " error %d.\n", | |
e15ba45d OD |
1335 | ll_get_fsname(inode->i_sb, NULL, 0), |
1336 | PFID(lu_object_fid(&obj->co_lu)), result); | |
65fb55d1 | 1337 | } |
d7e09d03 | 1338 | |
0a3bdb00 | 1339 | return result; |
d7e09d03 | 1340 | } |