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41#include <linux/kernel.h>
42#include <linux/mm.h>
43#include <linux/string.h>
44#include <linux/stat.h>
45#include <linux/errno.h>
46#include <linux/unistd.h>
47#include <asm/uaccess.h>
48
49#include <linux/migrate.h>
50#include <linux/fs.h>
51#include <linux/buffer_head.h>
52#include <linux/mpage.h>
53#include <linux/writeback.h>
54#include <linux/stat.h>
55#include <asm/uaccess.h>
56#include <linux/mm.h>
57#include <linux/pagemap.h>
58
59#define DEBUG_SUBSYSTEM S_LLITE
60
61#include <lustre_lite.h>
62#include "llite_internal.h"
63#include <linux/lustre_compat25.h>
64
65
66
67
68
69
70
71
72
73
74
75static void ll_invalidatepage(struct page *vmpage, unsigned long offset)
76{
77 struct inode *inode;
78 struct lu_env *env;
79 struct cl_page *page;
80 struct cl_object *obj;
81
82 int refcheck;
83
84 LASSERT(PageLocked(vmpage));
85 LASSERT(!PageWriteback(vmpage));
86
87
88
89
90
91
92 if (offset == 0) {
93 env = cl_env_get(&refcheck);
94 if (!IS_ERR(env)) {
95 inode = vmpage->mapping->host;
96 obj = ll_i2info(inode)->lli_clob;
97 if (obj != NULL) {
98 page = cl_vmpage_page(vmpage, obj);
99 if (page != NULL) {
100 lu_ref_add(&page->cp_reference,
101 "delete", vmpage);
102 cl_page_delete(env, page);
103 lu_ref_del(&page->cp_reference,
104 "delete", vmpage);
105 cl_page_put(env, page);
106 }
107 } else
108 LASSERT(vmpage->private == 0);
109 cl_env_put(env, &refcheck);
110 }
111 }
112}
113
114#ifdef HAVE_RELEASEPAGE_WITH_INT
115#define RELEASEPAGE_ARG_TYPE int
116#else
117#define RELEASEPAGE_ARG_TYPE gfp_t
118#endif
119static int ll_releasepage(struct page *vmpage, RELEASEPAGE_ARG_TYPE gfp_mask)
120{
121 struct cl_env_nest nest;
122 struct lu_env *env;
123 struct cl_object *obj;
124 struct cl_page *page;
125 struct address_space *mapping;
126 int result;
127
128 LASSERT(PageLocked(vmpage));
129 if (PageWriteback(vmpage) || PageDirty(vmpage))
130 return 0;
131
132 mapping = vmpage->mapping;
133 if (mapping == NULL)
134 return 1;
135
136 obj = ll_i2info(mapping->host)->lli_clob;
137 if (obj == NULL)
138 return 1;
139
140
141 if (page_count(vmpage) > 3)
142 return 0;
143
144
145 env = cl_env_nested_get(&nest);
146 if (IS_ERR(env))
147
148
149
150
151 return 0;
152
153 page = cl_vmpage_page(vmpage, obj);
154 result = page == NULL;
155 if (page != NULL) {
156 if (!cl_page_in_use(page)) {
157 result = 1;
158 cl_page_delete(env, page);
159 }
160 cl_page_put(env, page);
161 }
162 cl_env_nested_put(&nest, env);
163 return result;
164}
165
166static int ll_set_page_dirty(struct page *vmpage)
167{
168#if 0
169 struct cl_page *page = vvp_vmpage_page_transient(vmpage);
170 struct vvp_object *obj = cl_inode2vvp(vmpage->mapping->host);
171 struct vvp_page *cpg;
172
173
174
175
176 LASSERT(&obj->co_cl == page->cp_obj);
177 cpg = cl2vvp_page(cl_page_at(page, &vvp_device_type));
178
179
180
181
182
183 vvp_write_pending(obj, cpg);
184#endif
185 RETURN(__set_page_dirty_nobuffers(vmpage));
186}
187
188#define MAX_DIRECTIO_SIZE 2*1024*1024*1024UL
189
190static inline int ll_get_user_pages(int rw, unsigned long user_addr,
191 size_t size, struct page ***pages,
192 int *max_pages)
193{
194 int result = -ENOMEM;
195
196
197 if (size > MAX_DIRECTIO_SIZE) {
198 *pages = NULL;
199 return -EFBIG;
200 }
201
202 *max_pages = (user_addr + size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
203 *max_pages -= user_addr >> PAGE_CACHE_SHIFT;
204
205 OBD_ALLOC_LARGE(*pages, *max_pages * sizeof(**pages));
206 if (*pages) {
207 down_read(¤t->mm->mmap_sem);
208 result = get_user_pages(current, current->mm, user_addr,
209 *max_pages, (rw == READ), 0, *pages,
210 NULL);
211 up_read(¤t->mm->mmap_sem);
212 if (unlikely(result <= 0))
213 OBD_FREE_LARGE(*pages, *max_pages * sizeof(**pages));
214 }
215
216 return result;
217}
218
219
220
221static void ll_free_user_pages(struct page **pages, int npages, int do_dirty)
222{
223 int i;
224
225 for (i = 0; i < npages; i++) {
226 if (pages[i] == NULL)
227 break;
228 if (do_dirty)
229 set_page_dirty_lock(pages[i]);
230 page_cache_release(pages[i]);
231 }
232
233 OBD_FREE_LARGE(pages, npages * sizeof(*pages));
234}
235
236ssize_t ll_direct_rw_pages(const struct lu_env *env, struct cl_io *io,
237 int rw, struct inode *inode,
238 struct ll_dio_pages *pv)
239{
240 struct cl_page *clp;
241 struct cl_2queue *queue;
242 struct cl_object *obj = io->ci_obj;
243 int i;
244 ssize_t rc = 0;
245 loff_t file_offset = pv->ldp_start_offset;
246 long size = pv->ldp_size;
247 int page_count = pv->ldp_nr;
248 struct page **pages = pv->ldp_pages;
249 long page_size = cl_page_size(obj);
250 bool do_io;
251 int io_pages = 0;
252 ENTRY;
253
254 queue = &io->ci_queue;
255 cl_2queue_init(queue);
256 for (i = 0; i < page_count; i++) {
257 if (pv->ldp_offsets)
258 file_offset = pv->ldp_offsets[i];
259
260 LASSERT(!(file_offset & (page_size - 1)));
261 clp = cl_page_find(env, obj, cl_index(obj, file_offset),
262 pv->ldp_pages[i], CPT_TRANSIENT);
263 if (IS_ERR(clp)) {
264 rc = PTR_ERR(clp);
265 break;
266 }
267
268 rc = cl_page_own(env, io, clp);
269 if (rc) {
270 LASSERT(clp->cp_state == CPS_FREEING);
271 cl_page_put(env, clp);
272 break;
273 }
274
275 do_io = true;
276
277
278
279 if (clp->cp_type == CPT_CACHEABLE) {
280 struct page *vmpage = cl_page_vmpage(env, clp);
281 struct page *src_page;
282 struct page *dst_page;
283 void *src;
284 void *dst;
285
286 src_page = (rw == WRITE) ? pages[i] : vmpage;
287 dst_page = (rw == WRITE) ? vmpage : pages[i];
288
289 src = ll_kmap_atomic(src_page, KM_USER0);
290 dst = ll_kmap_atomic(dst_page, KM_USER1);
291 memcpy(dst, src, min(page_size, size));
292 ll_kunmap_atomic(dst, KM_USER1);
293 ll_kunmap_atomic(src, KM_USER0);
294
295
296
297 if (rw == WRITE)
298 set_page_dirty(vmpage);
299
300 if (rw == READ) {
301
302
303
304 cl_page_disown(env, io, clp);
305 do_io = false;
306 }
307 }
308
309 if (likely(do_io)) {
310 cl_2queue_add(queue, clp);
311
312
313
314
315
316 cl_page_clip(env, clp, 0, min(size, page_size));
317
318 ++io_pages;
319 }
320
321
322 cl_page_put(env, clp);
323 size -= page_size;
324 file_offset += page_size;
325 }
326
327 if (rc == 0 && io_pages) {
328 rc = cl_io_submit_sync(env, io,
329 rw == READ ? CRT_READ : CRT_WRITE,
330 queue, 0);
331 }
332 if (rc == 0)
333 rc = pv->ldp_size;
334
335 cl_2queue_discard(env, io, queue);
336 cl_2queue_disown(env, io, queue);
337 cl_2queue_fini(env, queue);
338 RETURN(rc);
339}
340EXPORT_SYMBOL(ll_direct_rw_pages);
341
342static ssize_t ll_direct_IO_26_seg(const struct lu_env *env, struct cl_io *io,
343 int rw, struct inode *inode,
344 struct address_space *mapping,
345 size_t size, loff_t file_offset,
346 struct page **pages, int page_count)
347{
348 struct ll_dio_pages pvec = { .ldp_pages = pages,
349 .ldp_nr = page_count,
350 .ldp_size = size,
351 .ldp_offsets = NULL,
352 .ldp_start_offset = file_offset
353 };
354
355 return ll_direct_rw_pages(env, io, rw, inode, &pvec);
356}
357
358#ifdef KMALLOC_MAX_SIZE
359#define MAX_MALLOC KMALLOC_MAX_SIZE
360#else
361#define MAX_MALLOC (128 * 1024)
362#endif
363
364
365
366
367
368
369#define MAX_DIO_SIZE ((MAX_MALLOC / sizeof(struct brw_page) * PAGE_CACHE_SIZE) & \
370 ~(DT_MAX_BRW_SIZE - 1))
371static ssize_t ll_direct_IO_26(int rw, struct kiocb *iocb,
372 const struct iovec *iov, loff_t file_offset,
373 unsigned long nr_segs)
374{
375 struct lu_env *env;
376 struct cl_io *io;
377 struct file *file = iocb->ki_filp;
378 struct inode *inode = file->f_mapping->host;
379 struct ccc_object *obj = cl_inode2ccc(inode);
380 long count = iov_length(iov, nr_segs);
381 long tot_bytes = 0, result = 0;
382 struct ll_inode_info *lli = ll_i2info(inode);
383 unsigned long seg = 0;
384 long size = MAX_DIO_SIZE;
385 int refcheck;
386 ENTRY;
387
388 if (!lli->lli_has_smd)
389 RETURN(-EBADF);
390
391
392 if ((file_offset & ~CFS_PAGE_MASK) || (count & ~CFS_PAGE_MASK))
393 RETURN(-EINVAL);
394
395 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), size=%lu (max %lu), "
396 "offset=%lld=%llx, pages %lu (max %lu)\n",
397 inode->i_ino, inode->i_generation, inode, count, MAX_DIO_SIZE,
398 file_offset, file_offset, count >> PAGE_CACHE_SHIFT,
399 MAX_DIO_SIZE >> PAGE_CACHE_SHIFT);
400
401
402 for (seg = 0; seg < nr_segs; seg++) {
403 if (((unsigned long)iov[seg].iov_base & ~CFS_PAGE_MASK) ||
404 (iov[seg].iov_len & ~CFS_PAGE_MASK))
405 RETURN(-EINVAL);
406 }
407
408 env = cl_env_get(&refcheck);
409 LASSERT(!IS_ERR(env));
410 io = ccc_env_io(env)->cui_cl.cis_io;
411 LASSERT(io != NULL);
412
413
414
415
416
417 if (rw == READ)
418 mutex_lock(&inode->i_mutex);
419
420 LASSERT(obj->cob_transient_pages == 0);
421 for (seg = 0; seg < nr_segs; seg++) {
422 long iov_left = iov[seg].iov_len;
423 unsigned long user_addr = (unsigned long)iov[seg].iov_base;
424
425 if (rw == READ) {
426 if (file_offset >= i_size_read(inode))
427 break;
428 if (file_offset + iov_left > i_size_read(inode))
429 iov_left = i_size_read(inode) - file_offset;
430 }
431
432 while (iov_left > 0) {
433 struct page **pages;
434 int page_count, max_pages = 0;
435 long bytes;
436
437 bytes = min(size, iov_left);
438 page_count = ll_get_user_pages(rw, user_addr, bytes,
439 &pages, &max_pages);
440 if (likely(page_count > 0)) {
441 if (unlikely(page_count < max_pages))
442 bytes = page_count << PAGE_CACHE_SHIFT;
443 result = ll_direct_IO_26_seg(env, io, rw, inode,
444 file->f_mapping,
445 bytes, file_offset,
446 pages, page_count);
447 ll_free_user_pages(pages, max_pages, rw==READ);
448 } else if (page_count == 0) {
449 GOTO(out, result = -EFAULT);
450 } else {
451 result = page_count;
452 }
453 if (unlikely(result <= 0)) {
454
455
456
457
458
459 if (result == -ENOMEM &&
460 size > (PAGE_CACHE_SIZE / sizeof(*pages)) *
461 PAGE_CACHE_SIZE) {
462 size = ((((size / 2) - 1) |
463 ~CFS_PAGE_MASK) + 1) &
464 CFS_PAGE_MASK;
465 CDEBUG(D_VFSTRACE,"DIO size now %lu\n",
466 size);
467 continue;
468 }
469
470 GOTO(out, result);
471 }
472
473 tot_bytes += result;
474 file_offset += result;
475 iov_left -= result;
476 user_addr += result;
477 }
478 }
479out:
480 LASSERT(obj->cob_transient_pages == 0);
481 if (rw == READ)
482 mutex_unlock(&inode->i_mutex);
483
484 if (tot_bytes > 0) {
485 if (rw == WRITE) {
486 struct lov_stripe_md *lsm;
487
488 lsm = ccc_inode_lsm_get(inode);
489 LASSERT(lsm != NULL);
490 lov_stripe_lock(lsm);
491 obd_adjust_kms(ll_i2dtexp(inode), lsm, file_offset, 0);
492 lov_stripe_unlock(lsm);
493 ccc_inode_lsm_put(inode, lsm);
494 }
495 }
496
497 cl_env_put(env, &refcheck);
498 RETURN(tot_bytes ? : result);
499}
500
501static int ll_write_begin(struct file *file, struct address_space *mapping,
502 loff_t pos, unsigned len, unsigned flags,
503 struct page **pagep, void **fsdata)
504{
505 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
506 struct page *page;
507 int rc;
508 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
509 ENTRY;
510
511 page = grab_cache_page_write_begin(mapping, index, flags);
512 if (!page)
513 RETURN(-ENOMEM);
514
515 *pagep = page;
516
517 rc = ll_prepare_write(file, page, from, from + len);
518 if (rc) {
519 unlock_page(page);
520 page_cache_release(page);
521 }
522 RETURN(rc);
523}
524
525static int ll_write_end(struct file *file, struct address_space *mapping,
526 loff_t pos, unsigned len, unsigned copied,
527 struct page *page, void *fsdata)
528{
529 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
530 int rc;
531
532 rc = ll_commit_write(file, page, from, from + copied);
533 unlock_page(page);
534 page_cache_release(page);
535
536 return rc ?: copied;
537}
538
539#ifdef CONFIG_MIGRATION
540int ll_migratepage(struct address_space *mapping,
541 struct page *newpage, struct page *page
542 , enum migrate_mode mode
543 )
544{
545
546 return -EIO;
547}
548#endif
549
550#ifndef MS_HAS_NEW_AOPS
551struct address_space_operations ll_aops = {
552 .readpage = ll_readpage,
553
554 .direct_IO = ll_direct_IO_26,
555 .writepage = ll_writepage,
556 .writepages = ll_writepages,
557 .set_page_dirty = ll_set_page_dirty,
558 .write_begin = ll_write_begin,
559 .write_end = ll_write_end,
560 .invalidatepage = ll_invalidatepage,
561 .releasepage = (void *)ll_releasepage,
562#ifdef CONFIG_MIGRATION
563 .migratepage = ll_migratepage,
564#endif
565 .bmap = NULL
566};
567#else
568struct address_space_operations_ext ll_aops = {
569 .orig_aops.readpage = ll_readpage,
570
571 .orig_aops.direct_IO = ll_direct_IO_26,
572 .orig_aops.writepage = ll_writepage,
573 .orig_aops.writepages = ll_writepages,
574 .orig_aops.set_page_dirty = ll_set_page_dirty,
575 .orig_aops.prepare_write = ll_prepare_write,
576 .orig_aops.commit_write = ll_commit_write,
577 .orig_aops.invalidatepage = ll_invalidatepage,
578 .orig_aops.releasepage = ll_releasepage,
579#ifdef CONFIG_MIGRATION
580 .orig_aops.migratepage = ll_migratepage,
581#endif
582 .orig_aops.bmap = NULL,
583 .write_begin = ll_write_begin,
584 .write_end = ll_write_end
585};
586#endif
587