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Linux/fs/f2fs/data.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * fs/f2fs/data.c
  4  *
  5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  6  *             http://www.samsung.com/
  7  */
  8 #include <linux/fs.h>
  9 #include <linux/f2fs_fs.h>
 10 #include <linux/buffer_head.h>
 11 #include <linux/mpage.h>
 12 #include <linux/writeback.h>
 13 #include <linux/backing-dev.h>
 14 #include <linux/pagevec.h>
 15 #include <linux/blkdev.h>
 16 #include <linux/bio.h>
 17 #include <linux/prefetch.h>
 18 #include <linux/uio.h>
 19 #include <linux/cleancache.h>
 20 #include <linux/sched/signal.h>
 21 
 22 #include "f2fs.h"
 23 #include "node.h"
 24 #include "segment.h"
 25 #include "trace.h"
 26 #include <trace/events/f2fs.h>
 27 
 28 #define NUM_PREALLOC_POST_READ_CTXS     128
 29 
 30 static struct kmem_cache *bio_post_read_ctx_cache;
 31 static mempool_t *bio_post_read_ctx_pool;
 32 
 33 static bool __is_cp_guaranteed(struct page *page)
 34 {
 35         struct address_space *mapping = page->mapping;
 36         struct inode *inode;
 37         struct f2fs_sb_info *sbi;
 38 
 39         if (!mapping)
 40                 return false;
 41 
 42         inode = mapping->host;
 43         sbi = F2FS_I_SB(inode);
 44 
 45         if (inode->i_ino == F2FS_META_INO(sbi) ||
 46                         inode->i_ino ==  F2FS_NODE_INO(sbi) ||
 47                         S_ISDIR(inode->i_mode) ||
 48                         (S_ISREG(inode->i_mode) &&
 49                         (f2fs_is_atomic_file(inode) || IS_NOQUOTA(inode))) ||
 50                         is_cold_data(page))
 51                 return true;
 52         return false;
 53 }
 54 
 55 static enum count_type __read_io_type(struct page *page)
 56 {
 57         struct address_space *mapping = page->mapping;
 58 
 59         if (mapping) {
 60                 struct inode *inode = mapping->host;
 61                 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 62 
 63                 if (inode->i_ino == F2FS_META_INO(sbi))
 64                         return F2FS_RD_META;
 65 
 66                 if (inode->i_ino == F2FS_NODE_INO(sbi))
 67                         return F2FS_RD_NODE;
 68         }
 69         return F2FS_RD_DATA;
 70 }
 71 
 72 /* postprocessing steps for read bios */
 73 enum bio_post_read_step {
 74         STEP_INITIAL = 0,
 75         STEP_DECRYPT,
 76 };
 77 
 78 struct bio_post_read_ctx {
 79         struct bio *bio;
 80         struct work_struct work;
 81         unsigned int cur_step;
 82         unsigned int enabled_steps;
 83 };
 84 
 85 static void __read_end_io(struct bio *bio)
 86 {
 87         struct page *page;
 88         struct bio_vec *bv;
 89         struct bvec_iter_all iter_all;
 90 
 91         bio_for_each_segment_all(bv, bio, iter_all) {
 92                 page = bv->bv_page;
 93 
 94                 /* PG_error was set if any post_read step failed */
 95                 if (bio->bi_status || PageError(page)) {
 96                         ClearPageUptodate(page);
 97                         /* will re-read again later */
 98                         ClearPageError(page);
 99                 } else {
100                         SetPageUptodate(page);
101                 }
102                 dec_page_count(F2FS_P_SB(page), __read_io_type(page));
103                 unlock_page(page);
104         }
105         if (bio->bi_private)
106                 mempool_free(bio->bi_private, bio_post_read_ctx_pool);
107         bio_put(bio);
108 }
109 
110 static void bio_post_read_processing(struct bio_post_read_ctx *ctx);
111 
112 static void decrypt_work(struct work_struct *work)
113 {
114         struct bio_post_read_ctx *ctx =
115                 container_of(work, struct bio_post_read_ctx, work);
116 
117         fscrypt_decrypt_bio(ctx->bio);
118 
119         bio_post_read_processing(ctx);
120 }
121 
122 static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
123 {
124         switch (++ctx->cur_step) {
125         case STEP_DECRYPT:
126                 if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
127                         INIT_WORK(&ctx->work, decrypt_work);
128                         fscrypt_enqueue_decrypt_work(&ctx->work);
129                         return;
130                 }
131                 ctx->cur_step++;
132                 /* fall-through */
133         default:
134                 __read_end_io(ctx->bio);
135         }
136 }
137 
138 static bool f2fs_bio_post_read_required(struct bio *bio)
139 {
140         return bio->bi_private && !bio->bi_status;
141 }
142 
143 static void f2fs_read_end_io(struct bio *bio)
144 {
145         if (time_to_inject(F2FS_P_SB(bio_first_page_all(bio)),
146                                                 FAULT_READ_IO)) {
147                 f2fs_show_injection_info(FAULT_READ_IO);
148                 bio->bi_status = BLK_STS_IOERR;
149         }
150 
151         if (f2fs_bio_post_read_required(bio)) {
152                 struct bio_post_read_ctx *ctx = bio->bi_private;
153 
154                 ctx->cur_step = STEP_INITIAL;
155                 bio_post_read_processing(ctx);
156                 return;
157         }
158 
159         __read_end_io(bio);
160 }
161 
162 static void f2fs_write_end_io(struct bio *bio)
163 {
164         struct f2fs_sb_info *sbi = bio->bi_private;
165         struct bio_vec *bvec;
166         struct bvec_iter_all iter_all;
167 
168         if (time_to_inject(sbi, FAULT_WRITE_IO)) {
169                 f2fs_show_injection_info(FAULT_WRITE_IO);
170                 bio->bi_status = BLK_STS_IOERR;
171         }
172 
173         bio_for_each_segment_all(bvec, bio, iter_all) {
174                 struct page *page = bvec->bv_page;
175                 enum count_type type = WB_DATA_TYPE(page);
176 
177                 if (IS_DUMMY_WRITTEN_PAGE(page)) {
178                         set_page_private(page, (unsigned long)NULL);
179                         ClearPagePrivate(page);
180                         unlock_page(page);
181                         mempool_free(page, sbi->write_io_dummy);
182 
183                         if (unlikely(bio->bi_status))
184                                 f2fs_stop_checkpoint(sbi, true);
185                         continue;
186                 }
187 
188                 fscrypt_pullback_bio_page(&page, true);
189 
190                 if (unlikely(bio->bi_status)) {
191                         mapping_set_error(page->mapping, -EIO);
192                         if (type == F2FS_WB_CP_DATA)
193                                 f2fs_stop_checkpoint(sbi, true);
194                 }
195 
196                 f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) &&
197                                         page->index != nid_of_node(page));
198 
199                 dec_page_count(sbi, type);
200                 if (f2fs_in_warm_node_list(sbi, page))
201                         f2fs_del_fsync_node_entry(sbi, page);
202                 clear_cold_data(page);
203                 end_page_writeback(page);
204         }
205         if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
206                                 wq_has_sleeper(&sbi->cp_wait))
207                 wake_up(&sbi->cp_wait);
208 
209         bio_put(bio);
210 }
211 
212 /*
213  * Return true, if pre_bio's bdev is same as its target device.
214  */
215 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
216                                 block_t blk_addr, struct bio *bio)
217 {
218         struct block_device *bdev = sbi->sb->s_bdev;
219         int i;
220 
221         if (f2fs_is_multi_device(sbi)) {
222                 for (i = 0; i < sbi->s_ndevs; i++) {
223                         if (FDEV(i).start_blk <= blk_addr &&
224                             FDEV(i).end_blk >= blk_addr) {
225                                 blk_addr -= FDEV(i).start_blk;
226                                 bdev = FDEV(i).bdev;
227                                 break;
228                         }
229                 }
230         }
231         if (bio) {
232                 bio_set_dev(bio, bdev);
233                 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
234         }
235         return bdev;
236 }
237 
238 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
239 {
240         int i;
241 
242         if (!f2fs_is_multi_device(sbi))
243                 return 0;
244 
245         for (i = 0; i < sbi->s_ndevs; i++)
246                 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
247                         return i;
248         return 0;
249 }
250 
251 static bool __same_bdev(struct f2fs_sb_info *sbi,
252                                 block_t blk_addr, struct bio *bio)
253 {
254         struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL);
255         return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno;
256 }
257 
258 /*
259  * Low-level block read/write IO operations.
260  */
261 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
262                                 struct writeback_control *wbc,
263                                 int npages, bool is_read,
264                                 enum page_type type, enum temp_type temp)
265 {
266         struct bio *bio;
267 
268         bio = f2fs_bio_alloc(sbi, npages, true);
269 
270         f2fs_target_device(sbi, blk_addr, bio);
271         if (is_read) {
272                 bio->bi_end_io = f2fs_read_end_io;
273                 bio->bi_private = NULL;
274         } else {
275                 bio->bi_end_io = f2fs_write_end_io;
276                 bio->bi_private = sbi;
277                 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, type, temp);
278         }
279         if (wbc)
280                 wbc_init_bio(wbc, bio);
281 
282         return bio;
283 }
284 
285 static inline void __submit_bio(struct f2fs_sb_info *sbi,
286                                 struct bio *bio, enum page_type type)
287 {
288         if (!is_read_io(bio_op(bio))) {
289                 unsigned int start;
290 
291                 if (type != DATA && type != NODE)
292                         goto submit_io;
293 
294                 if (test_opt(sbi, LFS) && current->plug)
295                         blk_finish_plug(current->plug);
296 
297                 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS;
298                 start %= F2FS_IO_SIZE(sbi);
299 
300                 if (start == 0)
301                         goto submit_io;
302 
303                 /* fill dummy pages */
304                 for (; start < F2FS_IO_SIZE(sbi); start++) {
305                         struct page *page =
306                                 mempool_alloc(sbi->write_io_dummy,
307                                               GFP_NOIO | __GFP_NOFAIL);
308                         f2fs_bug_on(sbi, !page);
309 
310                         zero_user_segment(page, 0, PAGE_SIZE);
311                         SetPagePrivate(page);
312                         set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE);
313                         lock_page(page);
314                         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
315                                 f2fs_bug_on(sbi, 1);
316                 }
317                 /*
318                  * In the NODE case, we lose next block address chain. So, we
319                  * need to do checkpoint in f2fs_sync_file.
320                  */
321                 if (type == NODE)
322                         set_sbi_flag(sbi, SBI_NEED_CP);
323         }
324 submit_io:
325         if (is_read_io(bio_op(bio)))
326                 trace_f2fs_submit_read_bio(sbi->sb, type, bio);
327         else
328                 trace_f2fs_submit_write_bio(sbi->sb, type, bio);
329         submit_bio(bio);
330 }
331 
332 static void __submit_merged_bio(struct f2fs_bio_info *io)
333 {
334         struct f2fs_io_info *fio = &io->fio;
335 
336         if (!io->bio)
337                 return;
338 
339         bio_set_op_attrs(io->bio, fio->op, fio->op_flags);
340 
341         if (is_read_io(fio->op))
342                 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio);
343         else
344                 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio);
345 
346         __submit_bio(io->sbi, io->bio, fio->type);
347         io->bio = NULL;
348 }
349 
350 static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
351                                                 struct page *page, nid_t ino)
352 {
353         struct bio_vec *bvec;
354         struct page *target;
355         struct bvec_iter_all iter_all;
356 
357         if (!io->bio)
358                 return false;
359 
360         if (!inode && !page && !ino)
361                 return true;
362 
363         bio_for_each_segment_all(bvec, io->bio, iter_all) {
364 
365                 if (bvec->bv_page->mapping)
366                         target = bvec->bv_page;
367                 else
368                         target = fscrypt_control_page(bvec->bv_page);
369 
370                 if (inode && inode == target->mapping->host)
371                         return true;
372                 if (page && page == target)
373                         return true;
374                 if (ino && ino == ino_of_node(target))
375                         return true;
376         }
377 
378         return false;
379 }
380 
381 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
382                                 enum page_type type, enum temp_type temp)
383 {
384         enum page_type btype = PAGE_TYPE_OF_BIO(type);
385         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
386 
387         down_write(&io->io_rwsem);
388 
389         /* change META to META_FLUSH in the checkpoint procedure */
390         if (type >= META_FLUSH) {
391                 io->fio.type = META_FLUSH;
392                 io->fio.op = REQ_OP_WRITE;
393                 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC;
394                 if (!test_opt(sbi, NOBARRIER))
395                         io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
396         }
397         __submit_merged_bio(io);
398         up_write(&io->io_rwsem);
399 }
400 
401 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
402                                 struct inode *inode, struct page *page,
403                                 nid_t ino, enum page_type type, bool force)
404 {
405         enum temp_type temp;
406         bool ret = true;
407 
408         for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
409                 if (!force)     {
410                         enum page_type btype = PAGE_TYPE_OF_BIO(type);
411                         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
412 
413                         down_read(&io->io_rwsem);
414                         ret = __has_merged_page(io, inode, page, ino);
415                         up_read(&io->io_rwsem);
416                 }
417                 if (ret)
418                         __f2fs_submit_merged_write(sbi, type, temp);
419 
420                 /* TODO: use HOT temp only for meta pages now. */
421                 if (type >= META)
422                         break;
423         }
424 }
425 
426 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
427 {
428         __submit_merged_write_cond(sbi, NULL, NULL, 0, type, true);
429 }
430 
431 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
432                                 struct inode *inode, struct page *page,
433                                 nid_t ino, enum page_type type)
434 {
435         __submit_merged_write_cond(sbi, inode, page, ino, type, false);
436 }
437 
438 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
439 {
440         f2fs_submit_merged_write(sbi, DATA);
441         f2fs_submit_merged_write(sbi, NODE);
442         f2fs_submit_merged_write(sbi, META);
443 }
444 
445 /*
446  * Fill the locked page with data located in the block address.
447  * A caller needs to unlock the page on failure.
448  */
449 int f2fs_submit_page_bio(struct f2fs_io_info *fio)
450 {
451         struct bio *bio;
452         struct page *page = fio->encrypted_page ?
453                         fio->encrypted_page : fio->page;
454 
455         if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
456                         fio->is_por ? META_POR : (__is_meta_io(fio) ?
457                         META_GENERIC : DATA_GENERIC_ENHANCE)))
458                 return -EFSCORRUPTED;
459 
460         trace_f2fs_submit_page_bio(page, fio);
461         f2fs_trace_ios(fio, 0);
462 
463         /* Allocate a new bio */
464         bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc,
465                                 1, is_read_io(fio->op), fio->type, fio->temp);
466 
467         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
468                 bio_put(bio);
469                 return -EFAULT;
470         }
471 
472         if (fio->io_wbc && !is_read_io(fio->op))
473                 wbc_account_io(fio->io_wbc, page, PAGE_SIZE);
474 
475         bio_set_op_attrs(bio, fio->op, fio->op_flags);
476 
477         inc_page_count(fio->sbi, is_read_io(fio->op) ?
478                         __read_io_type(page): WB_DATA_TYPE(fio->page));
479 
480         __submit_bio(fio->sbi, bio, fio->type);
481         return 0;
482 }
483 
484 void f2fs_submit_page_write(struct f2fs_io_info *fio)
485 {
486         struct f2fs_sb_info *sbi = fio->sbi;
487         enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
488         struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
489         struct page *bio_page;
490 
491         f2fs_bug_on(sbi, is_read_io(fio->op));
492 
493         down_write(&io->io_rwsem);
494 next:
495         if (fio->in_list) {
496                 spin_lock(&io->io_lock);
497                 if (list_empty(&io->io_list)) {
498                         spin_unlock(&io->io_lock);
499                         goto out;
500                 }
501                 fio = list_first_entry(&io->io_list,
502                                                 struct f2fs_io_info, list);
503                 list_del(&fio->list);
504                 spin_unlock(&io->io_lock);
505         }
506 
507         verify_fio_blkaddr(fio);
508 
509         bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
510 
511         /* set submitted = true as a return value */
512         fio->submitted = true;
513 
514         inc_page_count(sbi, WB_DATA_TYPE(bio_page));
515 
516         if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 ||
517             (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) ||
518                         !__same_bdev(sbi, fio->new_blkaddr, io->bio)))
519                 __submit_merged_bio(io);
520 alloc_new:
521         if (io->bio == NULL) {
522                 if ((fio->type == DATA || fio->type == NODE) &&
523                                 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
524                         dec_page_count(sbi, WB_DATA_TYPE(bio_page));
525                         fio->retry = true;
526                         goto skip;
527                 }
528                 io->bio = __bio_alloc(sbi, fio->new_blkaddr, fio->io_wbc,
529                                                 BIO_MAX_PAGES, false,
530                                                 fio->type, fio->temp);
531                 io->fio = *fio;
532         }
533 
534         if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
535                 __submit_merged_bio(io);
536                 goto alloc_new;
537         }
538 
539         if (fio->io_wbc)
540                 wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE);
541 
542         io->last_block_in_bio = fio->new_blkaddr;
543         f2fs_trace_ios(fio, 0);
544 
545         trace_f2fs_submit_page_write(fio->page, fio);
546 skip:
547         if (fio->in_list)
548                 goto next;
549 out:
550         if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) ||
551                                 f2fs_is_checkpoint_ready(sbi))
552                 __submit_merged_bio(io);
553         up_write(&io->io_rwsem);
554 }
555 
556 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
557                                         unsigned nr_pages, unsigned op_flag)
558 {
559         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
560         struct bio *bio;
561         struct bio_post_read_ctx *ctx;
562         unsigned int post_read_steps = 0;
563 
564         bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
565         if (!bio)
566                 return ERR_PTR(-ENOMEM);
567         f2fs_target_device(sbi, blkaddr, bio);
568         bio->bi_end_io = f2fs_read_end_io;
569         bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
570 
571         if (f2fs_encrypted_file(inode))
572                 post_read_steps |= 1 << STEP_DECRYPT;
573         if (post_read_steps) {
574                 ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
575                 if (!ctx) {
576                         bio_put(bio);
577                         return ERR_PTR(-ENOMEM);
578                 }
579                 ctx->bio = bio;
580                 ctx->enabled_steps = post_read_steps;
581                 bio->bi_private = ctx;
582         }
583 
584         return bio;
585 }
586 
587 /* This can handle encryption stuffs */
588 static int f2fs_submit_page_read(struct inode *inode, struct page *page,
589                                                         block_t blkaddr)
590 {
591         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
592         struct bio *bio;
593 
594         bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0);
595         if (IS_ERR(bio))
596                 return PTR_ERR(bio);
597 
598         /* wait for GCed page writeback via META_MAPPING */
599         f2fs_wait_on_block_writeback(inode, blkaddr);
600 
601         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
602                 bio_put(bio);
603                 return -EFAULT;
604         }
605         ClearPageError(page);
606         inc_page_count(sbi, F2FS_RD_DATA);
607         __submit_bio(sbi, bio, DATA);
608         return 0;
609 }
610 
611 static void __set_data_blkaddr(struct dnode_of_data *dn)
612 {
613         struct f2fs_node *rn = F2FS_NODE(dn->node_page);
614         __le32 *addr_array;
615         int base = 0;
616 
617         if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
618                 base = get_extra_isize(dn->inode);
619 
620         /* Get physical address of data block */
621         addr_array = blkaddr_in_node(rn);
622         addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
623 }
624 
625 /*
626  * Lock ordering for the change of data block address:
627  * ->data_page
628  *  ->node_page
629  *    update block addresses in the node page
630  */
631 void f2fs_set_data_blkaddr(struct dnode_of_data *dn)
632 {
633         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
634         __set_data_blkaddr(dn);
635         if (set_page_dirty(dn->node_page))
636                 dn->node_changed = true;
637 }
638 
639 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
640 {
641         dn->data_blkaddr = blkaddr;
642         f2fs_set_data_blkaddr(dn);
643         f2fs_update_extent_cache(dn);
644 }
645 
646 /* dn->ofs_in_node will be returned with up-to-date last block pointer */
647 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
648 {
649         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
650         int err;
651 
652         if (!count)
653                 return 0;
654 
655         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
656                 return -EPERM;
657         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
658                 return err;
659 
660         trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
661                                                 dn->ofs_in_node, count);
662 
663         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
664 
665         for (; count > 0; dn->ofs_in_node++) {
666                 block_t blkaddr = datablock_addr(dn->inode,
667                                         dn->node_page, dn->ofs_in_node);
668                 if (blkaddr == NULL_ADDR) {
669                         dn->data_blkaddr = NEW_ADDR;
670                         __set_data_blkaddr(dn);
671                         count--;
672                 }
673         }
674 
675         if (set_page_dirty(dn->node_page))
676                 dn->node_changed = true;
677         return 0;
678 }
679 
680 /* Should keep dn->ofs_in_node unchanged */
681 int f2fs_reserve_new_block(struct dnode_of_data *dn)
682 {
683         unsigned int ofs_in_node = dn->ofs_in_node;
684         int ret;
685 
686         ret = f2fs_reserve_new_blocks(dn, 1);
687         dn->ofs_in_node = ofs_in_node;
688         return ret;
689 }
690 
691 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
692 {
693         bool need_put = dn->inode_page ? false : true;
694         int err;
695 
696         err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE);
697         if (err)
698                 return err;
699 
700         if (dn->data_blkaddr == NULL_ADDR)
701                 err = f2fs_reserve_new_block(dn);
702         if (err || need_put)
703                 f2fs_put_dnode(dn);
704         return err;
705 }
706 
707 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
708 {
709         struct extent_info ei  = {0,0,0};
710         struct inode *inode = dn->inode;
711 
712         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
713                 dn->data_blkaddr = ei.blk + index - ei.fofs;
714                 return 0;
715         }
716 
717         return f2fs_reserve_block(dn, index);
718 }
719 
720 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
721                                                 int op_flags, bool for_write)
722 {
723         struct address_space *mapping = inode->i_mapping;
724         struct dnode_of_data dn;
725         struct page *page;
726         struct extent_info ei = {0,0,0};
727         int err;
728 
729         page = f2fs_grab_cache_page(mapping, index, for_write);
730         if (!page)
731                 return ERR_PTR(-ENOMEM);
732 
733         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
734                 dn.data_blkaddr = ei.blk + index - ei.fofs;
735                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), dn.data_blkaddr,
736                                                 DATA_GENERIC_ENHANCE_READ)) {
737                         err = -EFSCORRUPTED;
738                         goto put_err;
739                 }
740                 goto got_it;
741         }
742 
743         set_new_dnode(&dn, inode, NULL, NULL, 0);
744         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
745         if (err)
746                 goto put_err;
747         f2fs_put_dnode(&dn);
748 
749         if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
750                 err = -ENOENT;
751                 goto put_err;
752         }
753         if (dn.data_blkaddr != NEW_ADDR &&
754                         !f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
755                                                 dn.data_blkaddr,
756                                                 DATA_GENERIC_ENHANCE)) {
757                 err = -EFSCORRUPTED;
758                 goto put_err;
759         }
760 got_it:
761         if (PageUptodate(page)) {
762                 unlock_page(page);
763                 return page;
764         }
765 
766         /*
767          * A new dentry page is allocated but not able to be written, since its
768          * new inode page couldn't be allocated due to -ENOSPC.
769          * In such the case, its blkaddr can be remained as NEW_ADDR.
770          * see, f2fs_add_link -> f2fs_get_new_data_page ->
771          * f2fs_init_inode_metadata.
772          */
773         if (dn.data_blkaddr == NEW_ADDR) {
774                 zero_user_segment(page, 0, PAGE_SIZE);
775                 if (!PageUptodate(page))
776                         SetPageUptodate(page);
777                 unlock_page(page);
778                 return page;
779         }
780 
781         err = f2fs_submit_page_read(inode, page, dn.data_blkaddr);
782         if (err)
783                 goto put_err;
784         return page;
785 
786 put_err:
787         f2fs_put_page(page, 1);
788         return ERR_PTR(err);
789 }
790 
791 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index)
792 {
793         struct address_space *mapping = inode->i_mapping;
794         struct page *page;
795 
796         page = find_get_page(mapping, index);
797         if (page && PageUptodate(page))
798                 return page;
799         f2fs_put_page(page, 0);
800 
801         page = f2fs_get_read_data_page(inode, index, 0, false);
802         if (IS_ERR(page))
803                 return page;
804 
805         if (PageUptodate(page))
806                 return page;
807 
808         wait_on_page_locked(page);
809         if (unlikely(!PageUptodate(page))) {
810                 f2fs_put_page(page, 0);
811                 return ERR_PTR(-EIO);
812         }
813         return page;
814 }
815 
816 /*
817  * If it tries to access a hole, return an error.
818  * Because, the callers, functions in dir.c and GC, should be able to know
819  * whether this page exists or not.
820  */
821 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
822                                                         bool for_write)
823 {
824         struct address_space *mapping = inode->i_mapping;
825         struct page *page;
826 repeat:
827         page = f2fs_get_read_data_page(inode, index, 0, for_write);
828         if (IS_ERR(page))
829                 return page;
830 
831         /* wait for read completion */
832         lock_page(page);
833         if (unlikely(page->mapping != mapping)) {
834                 f2fs_put_page(page, 1);
835                 goto repeat;
836         }
837         if (unlikely(!PageUptodate(page))) {
838                 f2fs_put_page(page, 1);
839                 return ERR_PTR(-EIO);
840         }
841         return page;
842 }
843 
844 /*
845  * Caller ensures that this data page is never allocated.
846  * A new zero-filled data page is allocated in the page cache.
847  *
848  * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
849  * f2fs_unlock_op().
850  * Note that, ipage is set only by make_empty_dir, and if any error occur,
851  * ipage should be released by this function.
852  */
853 struct page *f2fs_get_new_data_page(struct inode *inode,
854                 struct page *ipage, pgoff_t index, bool new_i_size)
855 {
856         struct address_space *mapping = inode->i_mapping;
857         struct page *page;
858         struct dnode_of_data dn;
859         int err;
860 
861         page = f2fs_grab_cache_page(mapping, index, true);
862         if (!page) {
863                 /*
864                  * before exiting, we should make sure ipage will be released
865                  * if any error occur.
866                  */
867                 f2fs_put_page(ipage, 1);
868                 return ERR_PTR(-ENOMEM);
869         }
870 
871         set_new_dnode(&dn, inode, ipage, NULL, 0);
872         err = f2fs_reserve_block(&dn, index);
873         if (err) {
874                 f2fs_put_page(page, 1);
875                 return ERR_PTR(err);
876         }
877         if (!ipage)
878                 f2fs_put_dnode(&dn);
879 
880         if (PageUptodate(page))
881                 goto got_it;
882 
883         if (dn.data_blkaddr == NEW_ADDR) {
884                 zero_user_segment(page, 0, PAGE_SIZE);
885                 if (!PageUptodate(page))
886                         SetPageUptodate(page);
887         } else {
888                 f2fs_put_page(page, 1);
889 
890                 /* if ipage exists, blkaddr should be NEW_ADDR */
891                 f2fs_bug_on(F2FS_I_SB(inode), ipage);
892                 page = f2fs_get_lock_data_page(inode, index, true);
893                 if (IS_ERR(page))
894                         return page;
895         }
896 got_it:
897         if (new_i_size && i_size_read(inode) <
898                                 ((loff_t)(index + 1) << PAGE_SHIFT))
899                 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
900         return page;
901 }
902 
903 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
904 {
905         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
906         struct f2fs_summary sum;
907         struct node_info ni;
908         block_t old_blkaddr;
909         blkcnt_t count = 1;
910         int err;
911 
912         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
913                 return -EPERM;
914 
915         err = f2fs_get_node_info(sbi, dn->nid, &ni);
916         if (err)
917                 return err;
918 
919         dn->data_blkaddr = datablock_addr(dn->inode,
920                                 dn->node_page, dn->ofs_in_node);
921         if (dn->data_blkaddr != NULL_ADDR)
922                 goto alloc;
923 
924         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
925                 return err;
926 
927 alloc:
928         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
929         old_blkaddr = dn->data_blkaddr;
930         f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
931                                         &sum, seg_type, NULL, false);
932         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
933                 invalidate_mapping_pages(META_MAPPING(sbi),
934                                         old_blkaddr, old_blkaddr);
935         f2fs_set_data_blkaddr(dn);
936 
937         /*
938          * i_size will be updated by direct_IO. Otherwise, we'll get stale
939          * data from unwritten block via dio_read.
940          */
941         return 0;
942 }
943 
944 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
945 {
946         struct inode *inode = file_inode(iocb->ki_filp);
947         struct f2fs_map_blocks map;
948         int flag;
949         int err = 0;
950         bool direct_io = iocb->ki_flags & IOCB_DIRECT;
951 
952         /* convert inline data for Direct I/O*/
953         if (direct_io) {
954                 err = f2fs_convert_inline_inode(inode);
955                 if (err)
956                         return err;
957         }
958 
959         if (direct_io && allow_outplace_dio(inode, iocb, from))
960                 return 0;
961 
962         if (is_inode_flag_set(inode, FI_NO_PREALLOC))
963                 return 0;
964 
965         map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
966         map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
967         if (map.m_len > map.m_lblk)
968                 map.m_len -= map.m_lblk;
969         else
970                 map.m_len = 0;
971 
972         map.m_next_pgofs = NULL;
973         map.m_next_extent = NULL;
974         map.m_seg_type = NO_CHECK_TYPE;
975         map.m_may_create = true;
976 
977         if (direct_io) {
978                 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
979                 flag = f2fs_force_buffered_io(inode, iocb, from) ?
980                                         F2FS_GET_BLOCK_PRE_AIO :
981                                         F2FS_GET_BLOCK_PRE_DIO;
982                 goto map_blocks;
983         }
984         if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
985                 err = f2fs_convert_inline_inode(inode);
986                 if (err)
987                         return err;
988         }
989         if (f2fs_has_inline_data(inode))
990                 return err;
991 
992         flag = F2FS_GET_BLOCK_PRE_AIO;
993 
994 map_blocks:
995         err = f2fs_map_blocks(inode, &map, 1, flag);
996         if (map.m_len > 0 && err == -ENOSPC) {
997                 if (!direct_io)
998                         set_inode_flag(inode, FI_NO_PREALLOC);
999                 err = 0;
1000         }
1001         return err;
1002 }
1003 
1004 void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
1005 {
1006         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1007                 if (lock)
1008                         down_read(&sbi->node_change);
1009                 else
1010                         up_read(&sbi->node_change);
1011         } else {
1012                 if (lock)
1013                         f2fs_lock_op(sbi);
1014                 else
1015                         f2fs_unlock_op(sbi);
1016         }
1017 }
1018 
1019 /*
1020  * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
1021  * f2fs_map_blocks structure.
1022  * If original data blocks are allocated, then give them to blockdev.
1023  * Otherwise,
1024  *     a. preallocate requested block addresses
1025  *     b. do not use extent cache for better performance
1026  *     c. give the block addresses to blockdev
1027  */
1028 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
1029                                                 int create, int flag)
1030 {
1031         unsigned int maxblocks = map->m_len;
1032         struct dnode_of_data dn;
1033         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1034         int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE;
1035         pgoff_t pgofs, end_offset, end;
1036         int err = 0, ofs = 1;
1037         unsigned int ofs_in_node, last_ofs_in_node;
1038         blkcnt_t prealloc;
1039         struct extent_info ei = {0,0,0};
1040         block_t blkaddr;
1041         unsigned int start_pgofs;
1042 
1043         if (!maxblocks)
1044                 return 0;
1045 
1046         map->m_len = 0;
1047         map->m_flags = 0;
1048 
1049         /* it only supports block size == page size */
1050         pgofs = (pgoff_t)map->m_lblk;
1051         end = pgofs + maxblocks;
1052 
1053         if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
1054                 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO &&
1055                                                         map->m_may_create)
1056                         goto next_dnode;
1057 
1058                 map->m_pblk = ei.blk + pgofs - ei.fofs;
1059                 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
1060                 map->m_flags = F2FS_MAP_MAPPED;
1061                 if (map->m_next_extent)
1062                         *map->m_next_extent = pgofs + map->m_len;
1063 
1064                 /* for hardware encryption, but to avoid potential issue in future */
1065                 if (flag == F2FS_GET_BLOCK_DIO)
1066                         f2fs_wait_on_block_writeback_range(inode,
1067                                                 map->m_pblk, map->m_len);
1068                 goto out;
1069         }
1070 
1071 next_dnode:
1072         if (map->m_may_create)
1073                 __do_map_lock(sbi, flag, true);
1074 
1075         /* When reading holes, we need its node page */
1076         set_new_dnode(&dn, inode, NULL, NULL, 0);
1077         err = f2fs_get_dnode_of_data(&dn, pgofs, mode);
1078         if (err) {
1079                 if (flag == F2FS_GET_BLOCK_BMAP)
1080                         map->m_pblk = 0;
1081                 if (err == -ENOENT) {
1082                         err = 0;
1083                         if (map->m_next_pgofs)
1084                                 *map->m_next_pgofs =
1085                                         f2fs_get_next_page_offset(&dn, pgofs);
1086                         if (map->m_next_extent)
1087                                 *map->m_next_extent =
1088                                         f2fs_get_next_page_offset(&dn, pgofs);
1089                 }
1090                 goto unlock_out;
1091         }
1092 
1093         start_pgofs = pgofs;
1094         prealloc = 0;
1095         last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
1096         end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
1097 
1098 next_block:
1099         blkaddr = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
1100 
1101         if (__is_valid_data_blkaddr(blkaddr) &&
1102                 !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) {
1103                 err = -EFSCORRUPTED;
1104                 goto sync_out;
1105         }
1106 
1107         if (__is_valid_data_blkaddr(blkaddr)) {
1108                 /* use out-place-update for driect IO under LFS mode */
1109                 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO &&
1110                                                         map->m_may_create) {
1111                         err = __allocate_data_block(&dn, map->m_seg_type);
1112                         if (!err) {
1113                                 blkaddr = dn.data_blkaddr;
1114                                 set_inode_flag(inode, FI_APPEND_WRITE);
1115                         }
1116                 }
1117         } else {
1118                 if (create) {
1119                         if (unlikely(f2fs_cp_error(sbi))) {
1120                                 err = -EIO;
1121                                 goto sync_out;
1122                         }
1123                         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1124                                 if (blkaddr == NULL_ADDR) {
1125                                         prealloc++;
1126                                         last_ofs_in_node = dn.ofs_in_node;
1127                                 }
1128                         } else {
1129                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO &&
1130                                         flag != F2FS_GET_BLOCK_DIO);
1131                                 err = __allocate_data_block(&dn,
1132                                                         map->m_seg_type);
1133                                 if (!err)
1134                                         set_inode_flag(inode, FI_APPEND_WRITE);
1135                         }
1136                         if (err)
1137                                 goto sync_out;
1138                         map->m_flags |= F2FS_MAP_NEW;
1139                         blkaddr = dn.data_blkaddr;
1140                 } else {
1141                         if (flag == F2FS_GET_BLOCK_BMAP) {
1142                                 map->m_pblk = 0;
1143                                 goto sync_out;
1144                         }
1145                         if (flag == F2FS_GET_BLOCK_PRECACHE)
1146                                 goto sync_out;
1147                         if (flag == F2FS_GET_BLOCK_FIEMAP &&
1148                                                 blkaddr == NULL_ADDR) {
1149                                 if (map->m_next_pgofs)
1150                                         *map->m_next_pgofs = pgofs + 1;
1151                                 goto sync_out;
1152                         }
1153                         if (flag != F2FS_GET_BLOCK_FIEMAP) {
1154                                 /* for defragment case */
1155                                 if (map->m_next_pgofs)
1156                                         *map->m_next_pgofs = pgofs + 1;
1157                                 goto sync_out;
1158                         }
1159                 }
1160         }
1161 
1162         if (flag == F2FS_GET_BLOCK_PRE_AIO)
1163                 goto skip;
1164 
1165         if (map->m_len == 0) {
1166                 /* preallocated unwritten block should be mapped for fiemap. */
1167                 if (blkaddr == NEW_ADDR)
1168                         map->m_flags |= F2FS_MAP_UNWRITTEN;
1169                 map->m_flags |= F2FS_MAP_MAPPED;
1170 
1171                 map->m_pblk = blkaddr;
1172                 map->m_len = 1;
1173         } else if ((map->m_pblk != NEW_ADDR &&
1174                         blkaddr == (map->m_pblk + ofs)) ||
1175                         (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
1176                         flag == F2FS_GET_BLOCK_PRE_DIO) {
1177                 ofs++;
1178                 map->m_len++;
1179         } else {
1180                 goto sync_out;
1181         }
1182 
1183 skip:
1184         dn.ofs_in_node++;
1185         pgofs++;
1186 
1187         /* preallocate blocks in batch for one dnode page */
1188         if (flag == F2FS_GET_BLOCK_PRE_AIO &&
1189                         (pgofs == end || dn.ofs_in_node == end_offset)) {
1190 
1191                 dn.ofs_in_node = ofs_in_node;
1192                 err = f2fs_reserve_new_blocks(&dn, prealloc);
1193                 if (err)
1194                         goto sync_out;
1195 
1196                 map->m_len += dn.ofs_in_node - ofs_in_node;
1197                 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
1198                         err = -ENOSPC;
1199                         goto sync_out;
1200                 }
1201                 dn.ofs_in_node = end_offset;
1202         }
1203 
1204         if (pgofs >= end)
1205                 goto sync_out;
1206         else if (dn.ofs_in_node < end_offset)
1207                 goto next_block;
1208 
1209         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1210                 if (map->m_flags & F2FS_MAP_MAPPED) {
1211                         unsigned int ofs = start_pgofs - map->m_lblk;
1212 
1213                         f2fs_update_extent_cache_range(&dn,
1214                                 start_pgofs, map->m_pblk + ofs,
1215                                 map->m_len - ofs);
1216                 }
1217         }
1218 
1219         f2fs_put_dnode(&dn);
1220 
1221         if (map->m_may_create) {
1222                 __do_map_lock(sbi, flag, false);
1223                 f2fs_balance_fs(sbi, dn.node_changed);
1224         }
1225         goto next_dnode;
1226 
1227 sync_out:
1228 
1229         /* for hardware encryption, but to avoid potential issue in future */
1230         if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED)
1231                 f2fs_wait_on_block_writeback_range(inode,
1232                                                 map->m_pblk, map->m_len);
1233 
1234         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1235                 if (map->m_flags & F2FS_MAP_MAPPED) {
1236                         unsigned int ofs = start_pgofs - map->m_lblk;
1237 
1238                         f2fs_update_extent_cache_range(&dn,
1239                                 start_pgofs, map->m_pblk + ofs,
1240                                 map->m_len - ofs);
1241                 }
1242                 if (map->m_next_extent)
1243                         *map->m_next_extent = pgofs + 1;
1244         }
1245         f2fs_put_dnode(&dn);
1246 unlock_out:
1247         if (map->m_may_create) {
1248                 __do_map_lock(sbi, flag, false);
1249                 f2fs_balance_fs(sbi, dn.node_changed);
1250         }
1251 out:
1252         trace_f2fs_map_blocks(inode, map, err);
1253         return err;
1254 }
1255 
1256 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
1257 {
1258         struct f2fs_map_blocks map;
1259         block_t last_lblk;
1260         int err;
1261 
1262         if (pos + len > i_size_read(inode))
1263                 return false;
1264 
1265         map.m_lblk = F2FS_BYTES_TO_BLK(pos);
1266         map.m_next_pgofs = NULL;
1267         map.m_next_extent = NULL;
1268         map.m_seg_type = NO_CHECK_TYPE;
1269         map.m_may_create = false;
1270         last_lblk = F2FS_BLK_ALIGN(pos + len);
1271 
1272         while (map.m_lblk < last_lblk) {
1273                 map.m_len = last_lblk - map.m_lblk;
1274                 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
1275                 if (err || map.m_len == 0)
1276                         return false;
1277                 map.m_lblk += map.m_len;
1278         }
1279         return true;
1280 }
1281 
1282 static int __get_data_block(struct inode *inode, sector_t iblock,
1283                         struct buffer_head *bh, int create, int flag,
1284                         pgoff_t *next_pgofs, int seg_type, bool may_write)
1285 {
1286         struct f2fs_map_blocks map;
1287         int err;
1288 
1289         map.m_lblk = iblock;
1290         map.m_len = bh->b_size >> inode->i_blkbits;
1291         map.m_next_pgofs = next_pgofs;
1292         map.m_next_extent = NULL;
1293         map.m_seg_type = seg_type;
1294         map.m_may_create = may_write;
1295 
1296         err = f2fs_map_blocks(inode, &map, create, flag);
1297         if (!err) {
1298                 map_bh(bh, inode->i_sb, map.m_pblk);
1299                 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
1300                 bh->b_size = (u64)map.m_len << inode->i_blkbits;
1301         }
1302         return err;
1303 }
1304 
1305 static int get_data_block(struct inode *inode, sector_t iblock,
1306                         struct buffer_head *bh_result, int create, int flag,
1307                         pgoff_t *next_pgofs)
1308 {
1309         return __get_data_block(inode, iblock, bh_result, create,
1310                                                         flag, next_pgofs,
1311                                                         NO_CHECK_TYPE, create);
1312 }
1313 
1314 static int get_data_block_dio_write(struct inode *inode, sector_t iblock,
1315                         struct buffer_head *bh_result, int create)
1316 {
1317         return __get_data_block(inode, iblock, bh_result, create,
1318                                 F2FS_GET_BLOCK_DIO, NULL,
1319                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1320                                 true);
1321 }
1322 
1323 static int get_data_block_dio(struct inode *inode, sector_t iblock,
1324                         struct buffer_head *bh_result, int create)
1325 {
1326         return __get_data_block(inode, iblock, bh_result, create,
1327                                 F2FS_GET_BLOCK_DIO, NULL,
1328                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1329                                 false);
1330 }
1331 
1332 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
1333                         struct buffer_head *bh_result, int create)
1334 {
1335         /* Block number less than F2FS MAX BLOCKS */
1336         if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
1337                 return -EFBIG;
1338 
1339         return __get_data_block(inode, iblock, bh_result, create,
1340                                                 F2FS_GET_BLOCK_BMAP, NULL,
1341                                                 NO_CHECK_TYPE, create);
1342 }
1343 
1344 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
1345 {
1346         return (offset >> inode->i_blkbits);
1347 }
1348 
1349 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
1350 {
1351         return (blk << inode->i_blkbits);
1352 }
1353 
1354 static int f2fs_xattr_fiemap(struct inode *inode,
1355                                 struct fiemap_extent_info *fieinfo)
1356 {
1357         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1358         struct page *page;
1359         struct node_info ni;
1360         __u64 phys = 0, len;
1361         __u32 flags;
1362         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
1363         int err = 0;
1364 
1365         if (f2fs_has_inline_xattr(inode)) {
1366                 int offset;
1367 
1368                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
1369                                                 inode->i_ino, false);
1370                 if (!page)
1371                         return -ENOMEM;
1372 
1373                 err = f2fs_get_node_info(sbi, inode->i_ino, &ni);
1374                 if (err) {
1375                         f2fs_put_page(page, 1);
1376                         return err;
1377                 }
1378 
1379                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1380                 offset = offsetof(struct f2fs_inode, i_addr) +
1381                                         sizeof(__le32) * (DEF_ADDRS_PER_INODE -
1382                                         get_inline_xattr_addrs(inode));
1383 
1384                 phys += offset;
1385                 len = inline_xattr_size(inode);
1386 
1387                 f2fs_put_page(page, 1);
1388 
1389                 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
1390 
1391                 if (!xnid)
1392                         flags |= FIEMAP_EXTENT_LAST;
1393 
1394                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1395                 if (err || err == 1)
1396                         return err;
1397         }
1398 
1399         if (xnid) {
1400                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
1401                 if (!page)
1402                         return -ENOMEM;
1403 
1404                 err = f2fs_get_node_info(sbi, xnid, &ni);
1405                 if (err) {
1406                         f2fs_put_page(page, 1);
1407                         return err;
1408                 }
1409 
1410                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1411                 len = inode->i_sb->s_blocksize;
1412 
1413                 f2fs_put_page(page, 1);
1414 
1415                 flags = FIEMAP_EXTENT_LAST;
1416         }
1417 
1418         if (phys)
1419                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1420 
1421         return (err < 0 ? err : 0);
1422 }
1423 
1424 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1425                 u64 start, u64 len)
1426 {
1427         struct buffer_head map_bh;
1428         sector_t start_blk, last_blk;
1429         pgoff_t next_pgofs;
1430         u64 logical = 0, phys = 0, size = 0;
1431         u32 flags = 0;
1432         int ret = 0;
1433 
1434         if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
1435                 ret = f2fs_precache_extents(inode);
1436                 if (ret)
1437                         return ret;
1438         }
1439 
1440         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
1441         if (ret)
1442                 return ret;
1443 
1444         inode_lock(inode);
1445 
1446         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1447                 ret = f2fs_xattr_fiemap(inode, fieinfo);
1448                 goto out;
1449         }
1450 
1451         if (f2fs_has_inline_data(inode)) {
1452                 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
1453                 if (ret != -EAGAIN)
1454                         goto out;
1455         }
1456 
1457         if (logical_to_blk(inode, len) == 0)
1458                 len = blk_to_logical(inode, 1);
1459 
1460         start_blk = logical_to_blk(inode, start);
1461         last_blk = logical_to_blk(inode, start + len - 1);
1462 
1463 next:
1464         memset(&map_bh, 0, sizeof(struct buffer_head));
1465         map_bh.b_size = len;
1466 
1467         ret = get_data_block(inode, start_blk, &map_bh, 0,
1468                                         F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
1469         if (ret)
1470                 goto out;
1471 
1472         /* HOLE */
1473         if (!buffer_mapped(&map_bh)) {
1474                 start_blk = next_pgofs;
1475 
1476                 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode,
1477                                         F2FS_I_SB(inode)->max_file_blocks))
1478                         goto prep_next;
1479 
1480                 flags |= FIEMAP_EXTENT_LAST;
1481         }
1482 
1483         if (size) {
1484                 if (IS_ENCRYPTED(inode))
1485                         flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
1486 
1487                 ret = fiemap_fill_next_extent(fieinfo, logical,
1488                                 phys, size, flags);
1489         }
1490 
1491         if (start_blk > last_blk || ret)
1492                 goto out;
1493 
1494         logical = blk_to_logical(inode, start_blk);
1495         phys = blk_to_logical(inode, map_bh.b_blocknr);
1496         size = map_bh.b_size;
1497         flags = 0;
1498         if (buffer_unwritten(&map_bh))
1499                 flags = FIEMAP_EXTENT_UNWRITTEN;
1500 
1501         start_blk += logical_to_blk(inode, size);
1502 
1503 prep_next:
1504         cond_resched();
1505         if (fatal_signal_pending(current))
1506                 ret = -EINTR;
1507         else
1508                 goto next;
1509 out:
1510         if (ret == 1)
1511                 ret = 0;
1512 
1513         inode_unlock(inode);
1514         return ret;
1515 }
1516 
1517 static int f2fs_read_single_page(struct inode *inode, struct page *page,
1518                                         unsigned nr_pages,
1519                                         struct f2fs_map_blocks *map,
1520                                         struct bio **bio_ret,
1521                                         sector_t *last_block_in_bio,
1522                                         bool is_readahead)
1523 {
1524         struct bio *bio = *bio_ret;
1525         const unsigned blkbits = inode->i_blkbits;
1526         const unsigned blocksize = 1 << blkbits;
1527         sector_t block_in_file;
1528         sector_t last_block;
1529         sector_t last_block_in_file;
1530         sector_t block_nr;
1531         int ret = 0;
1532 
1533         block_in_file = (sector_t)page->index;
1534         last_block = block_in_file + nr_pages;
1535         last_block_in_file = (i_size_read(inode) + blocksize - 1) >>
1536                                                         blkbits;
1537         if (last_block > last_block_in_file)
1538                 last_block = last_block_in_file;
1539 
1540         /* just zeroing out page which is beyond EOF */
1541         if (block_in_file >= last_block)
1542                 goto zero_out;
1543         /*
1544          * Map blocks using the previous result first.
1545          */
1546         if ((map->m_flags & F2FS_MAP_MAPPED) &&
1547                         block_in_file > map->m_lblk &&
1548                         block_in_file < (map->m_lblk + map->m_len))
1549                 goto got_it;
1550 
1551         /*
1552          * Then do more f2fs_map_blocks() calls until we are
1553          * done with this page.
1554          */
1555         map->m_lblk = block_in_file;
1556         map->m_len = last_block - block_in_file;
1557 
1558         ret = f2fs_map_blocks(inode, map, 0, F2FS_GET_BLOCK_DEFAULT);
1559         if (ret)
1560                 goto out;
1561 got_it:
1562         if ((map->m_flags & F2FS_MAP_MAPPED)) {
1563                 block_nr = map->m_pblk + block_in_file - map->m_lblk;
1564                 SetPageMappedToDisk(page);
1565 
1566                 if (!PageUptodate(page) && !cleancache_get_page(page)) {
1567                         SetPageUptodate(page);
1568                         goto confused;
1569                 }
1570 
1571                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr,
1572                                                 DATA_GENERIC_ENHANCE_READ)) {
1573                         ret = -EFSCORRUPTED;
1574                         goto out;
1575                 }
1576         } else {
1577 zero_out:
1578                 zero_user_segment(page, 0, PAGE_SIZE);
1579                 if (!PageUptodate(page))
1580                         SetPageUptodate(page);
1581                 unlock_page(page);
1582                 goto out;
1583         }
1584 
1585         /*
1586          * This page will go to BIO.  Do we need to send this
1587          * BIO off first?
1588          */
1589         if (bio && (*last_block_in_bio != block_nr - 1 ||
1590                 !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) {
1591 submit_and_realloc:
1592                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1593                 bio = NULL;
1594         }
1595         if (bio == NULL) {
1596                 bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
1597                                 is_readahead ? REQ_RAHEAD : 0);
1598                 if (IS_ERR(bio)) {
1599                         ret = PTR_ERR(bio);
1600                         bio = NULL;
1601                         goto out;
1602                 }
1603         }
1604 
1605         /*
1606          * If the page is under writeback, we need to wait for
1607          * its completion to see the correct decrypted data.
1608          */
1609         f2fs_wait_on_block_writeback(inode, block_nr);
1610 
1611         if (bio_add_page(bio, page, blocksize, 0) < blocksize)
1612                 goto submit_and_realloc;
1613 
1614         inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA);
1615         ClearPageError(page);
1616         *last_block_in_bio = block_nr;
1617         goto out;
1618 confused:
1619         if (bio) {
1620                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1621                 bio = NULL;
1622         }
1623         unlock_page(page);
1624 out:
1625         *bio_ret = bio;
1626         return ret;
1627 }
1628 
1629 /*
1630  * This function was originally taken from fs/mpage.c, and customized for f2fs.
1631  * Major change was from block_size == page_size in f2fs by default.
1632  *
1633  * Note that the aops->readpages() function is ONLY used for read-ahead. If
1634  * this function ever deviates from doing just read-ahead, it should either
1635  * use ->readpage() or do the necessary surgery to decouple ->readpages()
1636  * from read-ahead.
1637  */
1638 static int f2fs_mpage_readpages(struct address_space *mapping,
1639                         struct list_head *pages, struct page *page,
1640                         unsigned nr_pages, bool is_readahead)
1641 {
1642         struct bio *bio = NULL;
1643         sector_t last_block_in_bio = 0;
1644         struct inode *inode = mapping->host;
1645         struct f2fs_map_blocks map;
1646         int ret = 0;
1647 
1648         map.m_pblk = 0;
1649         map.m_lblk = 0;
1650         map.m_len = 0;
1651         map.m_flags = 0;
1652         map.m_next_pgofs = NULL;
1653         map.m_next_extent = NULL;
1654         map.m_seg_type = NO_CHECK_TYPE;
1655         map.m_may_create = false;
1656 
1657         for (; nr_pages; nr_pages--) {
1658                 if (pages) {
1659                         page = list_last_entry(pages, struct page, lru);
1660 
1661                         prefetchw(&page->flags);
1662                         list_del(&page->lru);
1663                         if (add_to_page_cache_lru(page, mapping,
1664                                                   page->index,
1665                                                   readahead_gfp_mask(mapping)))
1666                                 goto next_page;
1667                 }
1668 
1669                 ret = f2fs_read_single_page(inode, page, nr_pages, &map, &bio,
1670                                         &last_block_in_bio, is_readahead);
1671                 if (ret) {
1672                         SetPageError(page);
1673                         zero_user_segment(page, 0, PAGE_SIZE);
1674                         unlock_page(page);
1675                 }
1676 next_page:
1677                 if (pages)
1678                         put_page(page);
1679         }
1680         BUG_ON(pages && !list_empty(pages));
1681         if (bio)
1682                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1683         return pages ? 0 : ret;
1684 }
1685 
1686 static int f2fs_read_data_page(struct file *file, struct page *page)
1687 {
1688         struct inode *inode = page->mapping->host;
1689         int ret = -EAGAIN;
1690 
1691         trace_f2fs_readpage(page, DATA);
1692 
1693         /* If the file has inline data, try to read it directly */
1694         if (f2fs_has_inline_data(inode))
1695                 ret = f2fs_read_inline_data(inode, page);
1696         if (ret == -EAGAIN)
1697                 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1, false);
1698         return ret;
1699 }
1700 
1701 static int f2fs_read_data_pages(struct file *file,
1702                         struct address_space *mapping,
1703                         struct list_head *pages, unsigned nr_pages)
1704 {
1705         struct inode *inode = mapping->host;
1706         struct page *page = list_last_entry(pages, struct page, lru);
1707 
1708         trace_f2fs_readpages(inode, page, nr_pages);
1709 
1710         /* If the file has inline data, skip readpages */
1711         if (f2fs_has_inline_data(inode))
1712                 return 0;
1713 
1714         return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
1715 }
1716 
1717 static int encrypt_one_page(struct f2fs_io_info *fio)
1718 {
1719         struct inode *inode = fio->page->mapping->host;
1720         struct page *mpage;
1721         gfp_t gfp_flags = GFP_NOFS;
1722 
1723         if (!f2fs_encrypted_file(inode))
1724                 return 0;
1725 
1726         /* wait for GCed page writeback via META_MAPPING */
1727         f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
1728 
1729 retry_encrypt:
1730         fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
1731                         PAGE_SIZE, 0, fio->page->index, gfp_flags);
1732         if (IS_ERR(fio->encrypted_page)) {
1733                 /* flush pending IOs and wait for a while in the ENOMEM case */
1734                 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
1735                         f2fs_flush_merged_writes(fio->sbi);
1736                         congestion_wait(BLK_RW_ASYNC, HZ/50);
1737                         gfp_flags |= __GFP_NOFAIL;
1738                         goto retry_encrypt;
1739                 }
1740                 return PTR_ERR(fio->encrypted_page);
1741         }
1742 
1743         mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr);
1744         if (mpage) {
1745                 if (PageUptodate(mpage))
1746                         memcpy(page_address(mpage),
1747                                 page_address(fio->encrypted_page), PAGE_SIZE);
1748                 f2fs_put_page(mpage, 1);
1749         }
1750         return 0;
1751 }
1752 
1753 static inline bool check_inplace_update_policy(struct inode *inode,
1754                                 struct f2fs_io_info *fio)
1755 {
1756         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1757         unsigned int policy = SM_I(sbi)->ipu_policy;
1758 
1759         if (policy & (0x1 << F2FS_IPU_FORCE))
1760                 return true;
1761         if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
1762                 return true;
1763         if (policy & (0x1 << F2FS_IPU_UTIL) &&
1764                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1765                 return true;
1766         if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) &&
1767                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1768                 return true;
1769 
1770         /*
1771          * IPU for rewrite async pages
1772          */
1773         if (policy & (0x1 << F2FS_IPU_ASYNC) &&
1774                         fio && fio->op == REQ_OP_WRITE &&
1775                         !(fio->op_flags & REQ_SYNC) &&
1776                         !IS_ENCRYPTED(inode))
1777                 return true;
1778 
1779         /* this is only set during fdatasync */
1780         if (policy & (0x1 << F2FS_IPU_FSYNC) &&
1781                         is_inode_flag_set(inode, FI_NEED_IPU))
1782                 return true;
1783 
1784         if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
1785                         !f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
1786                 return true;
1787 
1788         return false;
1789 }
1790 
1791 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
1792 {
1793         if (f2fs_is_pinned_file(inode))
1794                 return true;
1795 
1796         /* if this is cold file, we should overwrite to avoid fragmentation */
1797         if (file_is_cold(inode))
1798                 return true;
1799 
1800         return check_inplace_update_policy(inode, fio);
1801 }
1802 
1803 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
1804 {
1805         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1806 
1807         if (test_opt(sbi, LFS))
1808                 return true;
1809         if (S_ISDIR(inode->i_mode))
1810                 return true;
1811         if (IS_NOQUOTA(inode))
1812                 return true;
1813         if (f2fs_is_atomic_file(inode))
1814                 return true;
1815         if (fio) {
1816                 if (is_cold_data(fio->page))
1817                         return true;
1818                 if (IS_ATOMIC_WRITTEN_PAGE(fio->page))
1819                         return true;
1820                 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
1821                         f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
1822                         return true;
1823         }
1824         return false;
1825 }
1826 
1827 static inline bool need_inplace_update(struct f2fs_io_info *fio)
1828 {
1829         struct inode *inode = fio->page->mapping->host;
1830 
1831         if (f2fs_should_update_outplace(inode, fio))
1832                 return false;
1833 
1834         return f2fs_should_update_inplace(inode, fio);
1835 }
1836 
1837 int f2fs_do_write_data_page(struct f2fs_io_info *fio)
1838 {
1839         struct page *page = fio->page;
1840         struct inode *inode = page->mapping->host;
1841         struct dnode_of_data dn;
1842         struct extent_info ei = {0,0,0};
1843         struct node_info ni;
1844         bool ipu_force = false;
1845         int err = 0;
1846 
1847         set_new_dnode(&dn, inode, NULL, NULL, 0);
1848         if (need_inplace_update(fio) &&
1849                         f2fs_lookup_extent_cache(inode, page->index, &ei)) {
1850                 fio->old_blkaddr = ei.blk + page->index - ei.fofs;
1851 
1852                 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
1853                                                 DATA_GENERIC_ENHANCE))
1854                         return -EFSCORRUPTED;
1855 
1856                 ipu_force = true;
1857                 fio->need_lock = LOCK_DONE;
1858                 goto got_it;
1859         }
1860 
1861         /* Deadlock due to between page->lock and f2fs_lock_op */
1862         if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi))
1863                 return -EAGAIN;
1864 
1865         err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
1866         if (err)
1867                 goto out;
1868 
1869         fio->old_blkaddr = dn.data_blkaddr;
1870 
1871         /* This page is already truncated */
1872         if (fio->old_blkaddr == NULL_ADDR) {
1873                 ClearPageUptodate(page);
1874                 clear_cold_data(page);
1875                 goto out_writepage;
1876         }
1877 got_it:
1878         if (__is_valid_data_blkaddr(fio->old_blkaddr) &&
1879                 !f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
1880                                                 DATA_GENERIC_ENHANCE)) {
1881                 err = -EFSCORRUPTED;
1882                 goto out_writepage;
1883         }
1884         /*
1885          * If current allocation needs SSR,
1886          * it had better in-place writes for updated data.
1887          */
1888         if (ipu_force ||
1889                 (__is_valid_data_blkaddr(fio->old_blkaddr) &&
1890                                         need_inplace_update(fio))) {
1891                 err = encrypt_one_page(fio);
1892                 if (err)
1893                         goto out_writepage;
1894 
1895                 set_page_writeback(page);
1896                 ClearPageError(page);
1897                 f2fs_put_dnode(&dn);
1898                 if (fio->need_lock == LOCK_REQ)
1899                         f2fs_unlock_op(fio->sbi);
1900                 err = f2fs_inplace_write_data(fio);
1901                 if (err) {
1902                         if (f2fs_encrypted_file(inode))
1903                                 fscrypt_pullback_bio_page(&fio->encrypted_page,
1904                                                                         true);
1905                         if (PageWriteback(page))
1906                                 end_page_writeback(page);
1907                 } else {
1908                         set_inode_flag(inode, FI_UPDATE_WRITE);
1909                 }
1910                 trace_f2fs_do_write_data_page(fio->page, IPU);
1911                 return err;
1912         }
1913 
1914         if (fio->need_lock == LOCK_RETRY) {
1915                 if (!f2fs_trylock_op(fio->sbi)) {
1916                         err = -EAGAIN;
1917                         goto out_writepage;
1918                 }
1919                 fio->need_lock = LOCK_REQ;
1920         }
1921 
1922         err = f2fs_get_node_info(fio->sbi, dn.nid, &ni);
1923         if (err)
1924                 goto out_writepage;
1925 
1926         fio->version = ni.version;
1927 
1928         err = encrypt_one_page(fio);
1929         if (err)
1930                 goto out_writepage;
1931 
1932         set_page_writeback(page);
1933         ClearPageError(page);
1934 
1935         /* LFS mode write path */
1936         f2fs_outplace_write_data(&dn, fio);
1937         trace_f2fs_do_write_data_page(page, OPU);
1938         set_inode_flag(inode, FI_APPEND_WRITE);
1939         if (page->index == 0)
1940                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1941 out_writepage:
1942         f2fs_put_dnode(&dn);
1943 out:
1944         if (fio->need_lock == LOCK_REQ)
1945                 f2fs_unlock_op(fio->sbi);
1946         return err;
1947 }
1948 
1949 static int __write_data_page(struct page *page, bool *submitted,
1950                                 struct writeback_control *wbc,
1951                                 enum iostat_type io_type)
1952 {
1953         struct inode *inode = page->mapping->host;
1954         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1955         loff_t i_size = i_size_read(inode);
1956         const pgoff_t end_index = ((unsigned long long) i_size)
1957                                                         >> PAGE_SHIFT;
1958         loff_t psize = (page->index + 1) << PAGE_SHIFT;
1959         unsigned offset = 0;
1960         bool need_balance_fs = false;
1961         int err = 0;
1962         struct f2fs_io_info fio = {
1963                 .sbi = sbi,
1964                 .ino = inode->i_ino,
1965                 .type = DATA,
1966                 .op = REQ_OP_WRITE,
1967                 .op_flags = wbc_to_write_flags(wbc),
1968                 .old_blkaddr = NULL_ADDR,
1969                 .page = page,
1970                 .encrypted_page = NULL,
1971                 .submitted = false,
1972                 .need_lock = LOCK_RETRY,
1973                 .io_type = io_type,
1974                 .io_wbc = wbc,
1975         };
1976 
1977         trace_f2fs_writepage(page, DATA);
1978 
1979         /* we should bypass data pages to proceed the kworkder jobs */
1980         if (unlikely(f2fs_cp_error(sbi))) {
1981                 mapping_set_error(page->mapping, -EIO);
1982                 /*
1983                  * don't drop any dirty dentry pages for keeping lastest
1984                  * directory structure.
1985                  */
1986                 if (S_ISDIR(inode->i_mode))
1987                         goto redirty_out;
1988                 goto out;
1989         }
1990 
1991         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1992                 goto redirty_out;
1993 
1994         if (page->index < end_index)
1995                 goto write;
1996 
1997         /*
1998          * If the offset is out-of-range of file size,
1999          * this page does not have to be written to disk.
2000          */
2001         offset = i_size & (PAGE_SIZE - 1);
2002         if ((page->index >= end_index + 1) || !offset)
2003                 goto out;
2004 
2005         zero_user_segment(page, offset, PAGE_SIZE);
2006 write:
2007         if (f2fs_is_drop_cache(inode))
2008                 goto out;
2009         /* we should not write 0'th page having journal header */
2010         if (f2fs_is_volatile_file(inode) && (!page->index ||
2011                         (!wbc->for_reclaim &&
2012                         f2fs_available_free_memory(sbi, BASE_CHECK))))
2013                 goto redirty_out;
2014 
2015         /* Dentry blocks are controlled by checkpoint */
2016         if (S_ISDIR(inode->i_mode)) {
2017                 fio.need_lock = LOCK_DONE;
2018                 err = f2fs_do_write_data_page(&fio);
2019                 goto done;
2020         }
2021 
2022         if (!wbc->for_reclaim)
2023                 need_balance_fs = true;
2024         else if (has_not_enough_free_secs(sbi, 0, 0))
2025                 goto redirty_out;
2026         else
2027                 set_inode_flag(inode, FI_HOT_DATA);
2028 
2029         err = -EAGAIN;
2030         if (f2fs_has_inline_data(inode)) {
2031                 err = f2fs_write_inline_data(inode, page);
2032                 if (!err)
2033                         goto out;
2034         }
2035 
2036         if (err == -EAGAIN) {
2037                 err = f2fs_do_write_data_page(&fio);
2038                 if (err == -EAGAIN) {
2039                         fio.need_lock = LOCK_REQ;
2040                         err = f2fs_do_write_data_page(&fio);
2041                 }
2042         }
2043 
2044         if (err) {
2045                 file_set_keep_isize(inode);
2046         } else {
2047                 down_write(&F2FS_I(inode)->i_sem);
2048                 if (F2FS_I(inode)->last_disk_size < psize)
2049                         F2FS_I(inode)->last_disk_size = psize;
2050                 up_write(&F2FS_I(inode)->i_sem);
2051         }
2052 
2053 done:
2054         if (err && err != -ENOENT)
2055                 goto redirty_out;
2056 
2057 out:
2058         inode_dec_dirty_pages(inode);
2059         if (err) {
2060                 ClearPageUptodate(page);
2061                 clear_cold_data(page);
2062         }
2063 
2064         if (wbc->for_reclaim) {
2065                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA);
2066                 clear_inode_flag(inode, FI_HOT_DATA);
2067                 f2fs_remove_dirty_inode(inode);
2068                 submitted = NULL;
2069         }
2070 
2071         unlock_page(page);
2072         if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) &&
2073                                         !F2FS_I(inode)->cp_task)
2074                 f2fs_balance_fs(sbi, need_balance_fs);
2075 
2076         if (unlikely(f2fs_cp_error(sbi))) {
2077                 f2fs_submit_merged_write(sbi, DATA);
2078                 submitted = NULL;
2079         }
2080 
2081         if (submitted)
2082                 *submitted = fio.submitted;
2083 
2084         return 0;
2085 
2086 redirty_out:
2087         redirty_page_for_writepage(wbc, page);
2088         /*
2089          * pageout() in MM traslates EAGAIN, so calls handle_write_error()
2090          * -> mapping_set_error() -> set_bit(AS_EIO, ...).
2091          * file_write_and_wait_range() will see EIO error, which is critical
2092          * to return value of fsync() followed by atomic_write failure to user.
2093          */
2094         if (!err || wbc->for_reclaim)
2095                 return AOP_WRITEPAGE_ACTIVATE;
2096         unlock_page(page);
2097         return err;
2098 }
2099 
2100 static int f2fs_write_data_page(struct page *page,
2101                                         struct writeback_control *wbc)
2102 {
2103         return __write_data_page(page, NULL, wbc, FS_DATA_IO);
2104 }
2105 
2106 /*
2107  * This function was copied from write_cche_pages from mm/page-writeback.c.
2108  * The major change is making write step of cold data page separately from
2109  * warm/hot data page.
2110  */
2111 static int f2fs_write_cache_pages(struct address_space *mapping,
2112                                         struct writeback_control *wbc,
2113                                         enum iostat_type io_type)
2114 {
2115         int ret = 0;
2116         int done = 0;
2117         struct pagevec pvec;
2118         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
2119         int nr_pages;
2120         pgoff_t uninitialized_var(writeback_index);
2121         pgoff_t index;
2122         pgoff_t end;            /* Inclusive */
2123         pgoff_t done_index;
2124         int cycled;
2125         int range_whole = 0;
2126         xa_mark_t tag;
2127         int nwritten = 0;
2128 
2129         pagevec_init(&pvec);
2130 
2131         if (get_dirty_pages(mapping->host) <=
2132                                 SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
2133                 set_inode_flag(mapping->host, FI_HOT_DATA);
2134         else
2135                 clear_inode_flag(mapping->host, FI_HOT_DATA);
2136 
2137         if (wbc->range_cyclic) {
2138                 writeback_index = mapping->writeback_index; /* prev offset */
2139                 index = writeback_index;
2140                 if (index == 0)
2141                         cycled = 1;
2142                 else
2143                         cycled = 0;
2144                 end = -1;
2145         } else {
2146                 index = wbc->range_start >> PAGE_SHIFT;
2147                 end = wbc->range_end >> PAGE_SHIFT;
2148                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
2149                         range_whole = 1;
2150                 cycled = 1; /* ignore range_cyclic tests */
2151         }
2152         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2153                 tag = PAGECACHE_TAG_TOWRITE;
2154         else
2155                 tag = PAGECACHE_TAG_DIRTY;
2156 retry:
2157         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2158                 tag_pages_for_writeback(mapping, index, end);
2159         done_index = index;
2160         while (!done && (index <= end)) {
2161                 int i;
2162 
2163                 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
2164                                 tag);
2165                 if (nr_pages == 0)
2166                         break;
2167 
2168                 for (i = 0; i < nr_pages; i++) {
2169                         struct page *page = pvec.pages[i];
2170                         bool submitted = false;
2171 
2172                         /* give a priority to WB_SYNC threads */
2173                         if (atomic_read(&sbi->wb_sync_req[DATA]) &&
2174                                         wbc->sync_mode == WB_SYNC_NONE) {
2175                                 done = 1;
2176                                 break;
2177                         }
2178 
2179                         done_index = page->index;
2180 retry_write:
2181                         lock_page(page);
2182 
2183                         if (unlikely(page->mapping != mapping)) {
2184 continue_unlock:
2185                                 unlock_page(page);
2186                                 continue;
2187                         }
2188 
2189                         if (!PageDirty(page)) {
2190                                 /* someone wrote it for us */
2191                                 goto continue_unlock;
2192                         }
2193 
2194                         if (PageWriteback(page)) {
2195                                 if (wbc->sync_mode != WB_SYNC_NONE)
2196                                         f2fs_wait_on_page_writeback(page,
2197                                                         DATA, true, true);
2198                                 else
2199                                         goto continue_unlock;
2200                         }
2201 
2202                         if (!clear_page_dirty_for_io(page))
2203                                 goto continue_unlock;
2204 
2205                         ret = __write_data_page(page, &submitted, wbc, io_type);
2206                         if (unlikely(ret)) {
2207                                 /*
2208                                  * keep nr_to_write, since vfs uses this to
2209                                  * get # of written pages.
2210                                  */
2211                                 if (ret == AOP_WRITEPAGE_ACTIVATE) {
2212                                         unlock_page(page);
2213                                         ret = 0;
2214                                         continue;
2215                                 } else if (ret == -EAGAIN) {
2216                                         ret = 0;
2217                                         if (wbc->sync_mode == WB_SYNC_ALL) {
2218                                                 cond_resched();
2219                                                 congestion_wait(BLK_RW_ASYNC,
2220                                                                         HZ/50);
2221                                                 goto retry_write;
2222                                         }
2223                                         continue;
2224                                 }
2225                                 done_index = page->index + 1;
2226                                 done = 1;
2227                                 break;
2228                         } else if (submitted) {
2229                                 nwritten++;
2230                         }
2231 
2232                         if (--wbc->nr_to_write <= 0 &&
2233                                         wbc->sync_mode == WB_SYNC_NONE) {
2234                                 done = 1;
2235                                 break;
2236                         }
2237                 }
2238                 pagevec_release(&pvec);
2239                 cond_resched();
2240         }
2241 
2242         if (!cycled && !done) {
2243                 cycled = 1;
2244                 index = 0;
2245                 end = writeback_index - 1;
2246                 goto retry;
2247         }
2248         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2249                 mapping->writeback_index = done_index;
2250 
2251         if (nwritten)
2252                 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
2253                                                                 NULL, 0, DATA);
2254 
2255         return ret;
2256 }
2257 
2258 static inline bool __should_serialize_io(struct inode *inode,
2259                                         struct writeback_control *wbc)
2260 {
2261         if (!S_ISREG(inode->i_mode))
2262                 return false;
2263         if (IS_NOQUOTA(inode))
2264                 return false;
2265         /* to avoid deadlock in path of data flush */
2266         if (F2FS_I(inode)->cp_task)
2267                 return false;
2268         if (wbc->sync_mode != WB_SYNC_ALL)
2269                 return true;
2270         if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks)
2271                 return true;
2272         return false;
2273 }
2274 
2275 static int __f2fs_write_data_pages(struct address_space *mapping,
2276                                                 struct writeback_control *wbc,
2277                                                 enum iostat_type io_type)
2278 {
2279         struct inode *inode = mapping->host;
2280         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2281         struct blk_plug plug;
2282         int ret;
2283         bool locked = false;
2284 
2285         /* deal with chardevs and other special file */
2286         if (!mapping->a_ops->writepage)
2287                 return 0;
2288 
2289         /* skip writing if there is no dirty page in this inode */
2290         if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
2291                 return 0;
2292 
2293         /* during POR, we don't need to trigger writepage at all. */
2294         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
2295                 goto skip_write;
2296 
2297         if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) &&
2298                         wbc->sync_mode == WB_SYNC_NONE &&
2299                         get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
2300                         f2fs_available_free_memory(sbi, DIRTY_DENTS))
2301                 goto skip_write;
2302 
2303         /* skip writing during file defragment */
2304         if (is_inode_flag_set(inode, FI_DO_DEFRAG))
2305                 goto skip_write;
2306 
2307         trace_f2fs_writepages(mapping->host, wbc, DATA);
2308 
2309         /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */
2310         if (wbc->sync_mode == WB_SYNC_ALL)
2311                 atomic_inc(&sbi->wb_sync_req[DATA]);
2312         else if (atomic_read(&sbi->wb_sync_req[DATA]))
2313                 goto skip_write;
2314 
2315         if (__should_serialize_io(inode, wbc)) {
2316                 mutex_lock(&sbi->writepages);
2317                 locked = true;
2318         }
2319 
2320         blk_start_plug(&plug);
2321         ret = f2fs_write_cache_pages(mapping, wbc, io_type);
2322         blk_finish_plug(&plug);
2323 
2324         if (locked)
2325                 mutex_unlock(&sbi->writepages);
2326 
2327         if (wbc->sync_mode == WB_SYNC_ALL)
2328                 atomic_dec(&sbi->wb_sync_req[DATA]);
2329         /*
2330          * if some pages were truncated, we cannot guarantee its mapping->host
2331          * to detect pending bios.
2332          */
2333 
2334         f2fs_remove_dirty_inode(inode);
2335         return ret;
2336 
2337 skip_write:
2338         wbc->pages_skipped += get_dirty_pages(inode);
2339         trace_f2fs_writepages(mapping->host, wbc, DATA);
2340         return 0;
2341 }
2342 
2343 static int f2fs_write_data_pages(struct address_space *mapping,
2344                             struct writeback_control *wbc)
2345 {
2346         struct inode *inode = mapping->host;
2347 
2348         return __f2fs_write_data_pages(mapping, wbc,
2349                         F2FS_I(inode)->cp_task == current ?
2350                         FS_CP_DATA_IO : FS_DATA_IO);
2351 }
2352 
2353 static void f2fs_write_failed(struct address_space *mapping, loff_t to)
2354 {
2355         struct inode *inode = mapping->host;
2356         loff_t i_size = i_size_read(inode);
2357 
2358         if (to > i_size) {
2359                 down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
2360                 down_write(&F2FS_I(inode)->i_mmap_sem);
2361 
2362                 truncate_pagecache(inode, i_size);
2363                 if (!IS_NOQUOTA(inode))
2364                         f2fs_truncate_blocks(inode, i_size, true);
2365 
2366                 up_write(&F2FS_I(inode)->i_mmap_sem);
2367                 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
2368         }
2369 }
2370 
2371 static int prepare_write_begin(struct f2fs_sb_info *sbi,
2372                         struct page *page, loff_t pos, unsigned len,
2373                         block_t *blk_addr, bool *node_changed)
2374 {
2375         struct inode *inode = page->mapping->host;
2376         pgoff_t index = page->index;
2377         struct dnode_of_data dn;
2378         struct page *ipage;
2379         bool locked = false;
2380         struct extent_info ei = {0,0,0};
2381         int err = 0;
2382         int flag;
2383 
2384         /*
2385          * we already allocated all the blocks, so we don't need to get
2386          * the block addresses when there is no need to fill the page.
2387          */
2388         if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE &&
2389                         !is_inode_flag_set(inode, FI_NO_PREALLOC))
2390                 return 0;
2391 
2392         /* f2fs_lock_op avoids race between write CP and convert_inline_page */
2393         if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode))
2394                 flag = F2FS_GET_BLOCK_DEFAULT;
2395         else
2396                 flag = F2FS_GET_BLOCK_PRE_AIO;
2397 
2398         if (f2fs_has_inline_data(inode) ||
2399                         (pos & PAGE_MASK) >= i_size_read(inode)) {
2400                 __do_map_lock(sbi, flag, true);
2401                 locked = true;
2402         }
2403 restart:
2404         /* check inline_data */
2405         ipage = f2fs_get_node_page(sbi, inode->i_ino);
2406         if (IS_ERR(ipage)) {
2407                 err = PTR_ERR(ipage);
2408                 goto unlock_out;
2409         }
2410 
2411         set_new_dnode(&dn, inode, ipage, ipage, 0);
2412 
2413         if (f2fs_has_inline_data(inode)) {
2414                 if (pos + len <= MAX_INLINE_DATA(inode)) {
2415                         f2fs_do_read_inline_data(page, ipage);
2416                         set_inode_flag(inode, FI_DATA_EXIST);
2417                         if (inode->i_nlink)
2418                                 set_inline_node(ipage);
2419                 } else {
2420                         err = f2fs_convert_inline_page(&dn, page);
2421                         if (err)
2422                                 goto out;
2423                         if (dn.data_blkaddr == NULL_ADDR)
2424                                 err = f2fs_get_block(&dn, index);
2425                 }
2426         } else if (locked) {
2427                 err = f2fs_get_block(&dn, index);
2428         } else {
2429                 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
2430                         dn.data_blkaddr = ei.blk + index - ei.fofs;
2431                 } else {
2432                         /* hole case */
2433                         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
2434                         if (err || dn.data_blkaddr == NULL_ADDR) {
2435                                 f2fs_put_dnode(&dn);
2436                                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
2437                                                                 true);
2438                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO);
2439                                 locked = true;
2440                                 goto restart;
2441                         }
2442                 }
2443         }
2444 
2445         /* convert_inline_page can make node_changed */
2446         *blk_addr = dn.data_blkaddr;
2447         *node_changed = dn.node_changed;
2448 out:
2449         f2fs_put_dnode(&dn);
2450 unlock_out:
2451         if (locked)
2452                 __do_map_lock(sbi, flag, false);
2453         return err;
2454 }
2455 
2456 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
2457                 loff_t pos, unsigned len, unsigned flags,
2458                 struct page **pagep, void **fsdata)
2459 {
2460         struct inode *inode = mapping->host;
2461         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2462         struct page *page = NULL;
2463         pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
2464         bool need_balance = false, drop_atomic = false;
2465         block_t blkaddr = NULL_ADDR;
2466         int err = 0;
2467 
2468         trace_f2fs_write_begin(inode, pos, len, flags);
2469 
2470         err = f2fs_is_checkpoint_ready(sbi);
2471         if (err)
2472                 goto fail;
2473 
2474         if ((f2fs_is_atomic_file(inode) &&
2475                         !f2fs_available_free_memory(sbi, INMEM_PAGES)) ||
2476                         is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) {
2477                 err = -ENOMEM;
2478                 drop_atomic = true;
2479                 goto fail;
2480         }
2481 
2482         /*
2483          * We should check this at this moment to avoid deadlock on inode page
2484          * and #0 page. The locking rule for inline_data conversion should be:
2485          * lock_page(page #0) -> lock_page(inode_page)
2486          */
2487         if (index != 0) {
2488                 err = f2fs_convert_inline_inode(inode);
2489                 if (err)
2490                         goto fail;
2491         }
2492 repeat:
2493         /*
2494          * Do not use grab_cache_page_write_begin() to avoid deadlock due to
2495          * wait_for_stable_page. Will wait that below with our IO control.
2496          */
2497         page = f2fs_pagecache_get_page(mapping, index,
2498                                 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS);
2499         if (!page) {
2500                 err = -ENOMEM;
2501                 goto fail;
2502         }
2503 
2504         *pagep = page;
2505 
2506         err = prepare_write_begin(sbi, page, pos, len,
2507                                         &blkaddr, &need_balance);
2508         if (err)
2509                 goto fail;
2510 
2511         if (need_balance && !IS_NOQUOTA(inode) &&
2512                         has_not_enough_free_secs(sbi, 0, 0)) {
2513                 unlock_page(page);
2514                 f2fs_balance_fs(sbi, true);
2515                 lock_page(page);
2516                 if (page->mapping != mapping) {
2517                         /* The page got truncated from under us */
2518                         f2fs_put_page(page, 1);
2519                         goto repeat;
2520                 }
2521         }
2522 
2523         f2fs_wait_on_page_writeback(page, DATA, false, true);
2524 
2525         if (len == PAGE_SIZE || PageUptodate(page))
2526                 return 0;
2527 
2528         if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) {
2529                 zero_user_segment(page, len, PAGE_SIZE);
2530                 return 0;
2531         }
2532 
2533         if (blkaddr == NEW_ADDR) {
2534                 zero_user_segment(page, 0, PAGE_SIZE);
2535                 SetPageUptodate(page);
2536         } else {
2537                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
2538                                 DATA_GENERIC_ENHANCE_READ)) {
2539                         err = -EFSCORRUPTED;
2540                         goto fail;
2541                 }
2542                 err = f2fs_submit_page_read(inode, page, blkaddr);
2543                 if (err)
2544                         goto fail;
2545 
2546                 lock_page(page);
2547                 if (unlikely(page->mapping != mapping)) {
2548                         f2fs_put_page(page, 1);
2549                         goto repeat;
2550                 }
2551                 if (unlikely(!PageUptodate(page))) {
2552                         err = -EIO;
2553                         goto fail;
2554                 }
2555         }
2556         return 0;
2557 
2558 fail:
2559         f2fs_put_page(page, 1);
2560         f2fs_write_failed(mapping, pos + len);
2561         if (drop_atomic)
2562                 f2fs_drop_inmem_pages_all(sbi, false);
2563         return err;
2564 }
2565 
2566 static int f2fs_write_end(struct file *file,
2567                         struct address_space *mapping,
2568                         loff_t pos, unsigned len, unsigned copied,
2569                         struct page *page, void *fsdata)
2570 {
2571         struct inode *inode = page->mapping->host;
2572 
2573         trace_f2fs_write_end(inode, pos, len, copied);
2574 
2575         /*
2576          * This should be come from len == PAGE_SIZE, and we expect copied
2577          * should be PAGE_SIZE. Otherwise, we treat it with zero copied and
2578          * let generic_perform_write() try to copy data again through copied=0.
2579          */
2580         if (!PageUptodate(page)) {
2581                 if (unlikely(copied != len))
2582                         copied = 0;
2583                 else
2584                         SetPageUptodate(page);
2585         }
2586         if (!copied)
2587                 goto unlock_out;
2588 
2589         set_page_dirty(page);
2590 
2591         if (pos + copied > i_size_read(inode))
2592                 f2fs_i_size_write(inode, pos + copied);
2593 unlock_out:
2594         f2fs_put_page(page, 1);
2595         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
2596         return copied;
2597 }
2598 
2599 static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
2600                            loff_t offset)
2601 {
2602         unsigned i_blkbits = READ_ONCE(inode->i_blkbits);
2603         unsigned blkbits = i_blkbits;
2604         unsigned blocksize_mask = (1 << blkbits) - 1;
2605         unsigned long align = offset | iov_iter_alignment(iter);
2606         struct block_device *bdev = inode->i_sb->s_bdev;
2607 
2608         if (align & blocksize_mask) {
2609                 if (bdev)
2610                         blkbits = blksize_bits(bdev_logical_block_size(bdev));
2611                 blocksize_mask = (1 << blkbits) - 1;
2612                 if (align & blocksize_mask)
2613                         return -EINVAL;
2614                 return 1;
2615         }
2616         return 0;
2617 }
2618 
2619 static void f2fs_dio_end_io(struct bio *bio)
2620 {
2621         struct f2fs_private_dio *dio = bio->bi_private;
2622 
2623         dec_page_count(F2FS_I_SB(dio->inode),
2624                         dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
2625 
2626         bio->bi_private = dio->orig_private;
2627         bio->bi_end_io = dio->orig_end_io;
2628 
2629         kvfree(dio);
2630 
2631         bio_endio(bio);
2632 }
2633 
2634 static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode,
2635                                                         loff_t file_offset)
2636 {
2637         struct f2fs_private_dio *dio;
2638         bool write = (bio_op(bio) == REQ_OP_WRITE);
2639 
2640         dio = f2fs_kzalloc(F2FS_I_SB(inode),
2641                         sizeof(struct f2fs_private_dio), GFP_NOFS);
2642         if (!dio)
2643                 goto out;
2644 
2645         dio->inode = inode;
2646         dio->orig_end_io = bio->bi_end_io;
2647         dio->orig_private = bio->bi_private;
2648         dio->write = write;
2649 
2650         bio->bi_end_io = f2fs_dio_end_io;
2651         bio->bi_private = dio;
2652 
2653         inc_page_count(F2FS_I_SB(inode),
2654                         write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
2655 
2656         submit_bio(bio);
2657         return;
2658 out:
2659         bio->bi_status = BLK_STS_IOERR;
2660         bio_endio(bio);
2661 }
2662 
2663 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2664 {
2665         struct address_space *mapping = iocb->ki_filp->f_mapping;
2666         struct inode *inode = mapping->host;
2667         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2668         struct f2fs_inode_info *fi = F2FS_I(inode);
2669         size_t count = iov_iter_count(iter);
2670         loff_t offset = iocb->ki_pos;
2671         int rw = iov_iter_rw(iter);
2672         int err;
2673         enum rw_hint hint = iocb->ki_hint;
2674         int whint_mode = F2FS_OPTION(sbi).whint_mode;
2675         bool do_opu;
2676 
2677         err = check_direct_IO(inode, iter, offset);
2678         if (err)
2679                 return err < 0 ? err : 0;
2680 
2681         if (f2fs_force_buffered_io(inode, iocb, iter))
2682                 return 0;
2683 
2684         do_opu = allow_outplace_dio(inode, iocb, iter);
2685 
2686         trace_f2fs_direct_IO_enter(inode, offset, count, rw);
2687 
2688         if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
2689                 iocb->ki_hint = WRITE_LIFE_NOT_SET;
2690 
2691         if (iocb->ki_flags & IOCB_NOWAIT) {
2692                 if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
2693                         iocb->ki_hint = hint;
2694                         err = -EAGAIN;
2695                         goto out;
2696                 }
2697                 if (do_opu && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
2698                         up_read(&fi->i_gc_rwsem[rw]);
2699                         iocb->ki_hint = hint;
2700                         err = -EAGAIN;
2701                         goto out;
2702                 }
2703         } else {
2704                 down_read(&fi->i_gc_rwsem[rw]);
2705                 if (do_opu)
2706                         down_read(&fi->i_gc_rwsem[READ]);
2707         }
2708 
2709         err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
2710                         iter, rw == WRITE ? get_data_block_dio_write :
2711                         get_data_block_dio, NULL, f2fs_dio_submit_bio,
2712                         DIO_LOCKING | DIO_SKIP_HOLES);
2713 
2714         if (do_opu)
2715                 up_read(&fi->i_gc_rwsem[READ]);
2716 
2717         up_read(&fi->i_gc_rwsem[rw]);
2718 
2719         if (rw == WRITE) {
2720                 if (whint_mode == WHINT_MODE_OFF)
2721                         iocb->ki_hint = hint;
2722                 if (err > 0) {
2723                         f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
2724                                                                         err);
2725                         if (!do_opu)
2726                                 set_inode_flag(inode, FI_UPDATE_WRITE);
2727                 } else if (err < 0) {
2728                         f2fs_write_failed(mapping, offset + count);
2729                 }
2730         }
2731 
2732 out:
2733         trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
2734 
2735         return err;
2736 }
2737 
2738 void f2fs_invalidate_page(struct page *page, unsigned int offset,
2739                                                         unsigned int length)
2740 {
2741         struct inode *inode = page->mapping->host;
2742         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2743 
2744         if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
2745                 (offset % PAGE_SIZE || length != PAGE_SIZE))
2746                 return;
2747 
2748         if (PageDirty(page)) {
2749                 if (inode->i_ino == F2FS_META_INO(sbi)) {
2750                         dec_page_count(sbi, F2FS_DIRTY_META);
2751                 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
2752                         dec_page_count(sbi, F2FS_DIRTY_NODES);
2753                 } else {
2754                         inode_dec_dirty_pages(inode);
2755                         f2fs_remove_dirty_inode(inode);
2756                 }
2757         }
2758 
2759         clear_cold_data(page);
2760 
2761         if (IS_ATOMIC_WRITTEN_PAGE(page))
2762                 return f2fs_drop_inmem_page(inode, page);
2763 
2764         f2fs_clear_page_private(page);
2765 }
2766 
2767 int f2fs_release_page(struct page *page, gfp_t wait)
2768 {
2769         /* If this is dirty page, keep PagePrivate */
2770         if (PageDirty(page))
2771                 return 0;
2772 
2773         /* This is atomic written page, keep Private */
2774         if (IS_ATOMIC_WRITTEN_PAGE(page))
2775                 return 0;
2776 
2777         clear_cold_data(page);
2778         f2fs_clear_page_private(page);
2779         return 1;
2780 }
2781 
2782 static int f2fs_set_data_page_dirty(struct page *page)
2783 {
2784         struct address_space *mapping = page->mapping;
2785         struct inode *inode = mapping->host;
2786 
2787         trace_f2fs_set_page_dirty(page, DATA);
2788 
2789         if (!PageUptodate(page))
2790                 SetPageUptodate(page);
2791 
2792         if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) {
2793                 if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
2794                         f2fs_register_inmem_page(inode, page);
2795                         return 1;
2796                 }
2797                 /*
2798                  * Previously, this page has been registered, we just
2799                  * return here.
2800                  */
2801                 return 0;
2802         }
2803 
2804         if (!PageDirty(page)) {
2805                 __set_page_dirty_nobuffers(page);
2806                 f2fs_update_dirty_page(inode, page);
2807                 return 1;
2808         }
2809         return 0;
2810 }
2811 
2812 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
2813 {
2814         struct inode *inode = mapping->host;
2815 
2816         if (f2fs_has_inline_data(inode))
2817                 return 0;
2818 
2819         /* make sure allocating whole blocks */
2820         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
2821                 filemap_write_and_wait(mapping);
2822 
2823         return generic_block_bmap(mapping, block, get_data_block_bmap);
2824 }
2825 
2826 #ifdef CONFIG_MIGRATION
2827 #include <linux/migrate.h>
2828 
2829 int f2fs_migrate_page(struct address_space *mapping,
2830                 struct page *newpage, struct page *page, enum migrate_mode mode)
2831 {
2832         int rc, extra_count;
2833         struct f2fs_inode_info *fi = F2FS_I(mapping->host);
2834         bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page);
2835 
2836         BUG_ON(PageWriteback(page));
2837 
2838         /* migrating an atomic written page is safe with the inmem_lock hold */
2839         if (atomic_written) {
2840                 if (mode != MIGRATE_SYNC)
2841                         return -EBUSY;
2842                 if (!mutex_trylock(&fi->inmem_lock))
2843                         return -EAGAIN;
2844         }
2845 
2846         /* one extra reference was held for atomic_write page */
2847         extra_count = atomic_written ? 1 : 0;
2848         rc = migrate_page_move_mapping(mapping, newpage,
2849                                 page, mode, extra_count);
2850         if (rc != MIGRATEPAGE_SUCCESS) {
2851                 if (atomic_written)
2852                         mutex_unlock(&fi->inmem_lock);
2853                 return rc;
2854         }
2855 
2856         if (atomic_written) {
2857                 struct inmem_pages *cur;
2858                 list_for_each_entry(cur, &fi->inmem_pages, list)
2859                         if (cur->page == page) {
2860                                 cur->page = newpage;
2861                                 break;
2862                         }
2863                 mutex_unlock(&fi->inmem_lock);
2864                 put_page(page);
2865                 get_page(newpage);
2866         }
2867 
2868         if (PagePrivate(page)) {
2869                 f2fs_set_page_private(newpage, page_private(page));
2870                 f2fs_clear_page_private(page);
2871         }
2872 
2873         if (mode != MIGRATE_SYNC_NO_COPY)
2874                 migrate_page_copy(newpage, page);
2875         else
2876                 migrate_page_states(newpage, page);
2877 
2878         return MIGRATEPAGE_SUCCESS;
2879 }
2880 #endif
2881 
2882 const struct address_space_operations f2fs_dblock_aops = {
2883         .readpage       = f2fs_read_data_page,
2884         .readpages      = f2fs_read_data_pages,
2885         .writepage      = f2fs_write_data_page,
2886         .writepages     = f2fs_write_data_pages,
2887         .write_begin    = f2fs_write_begin,
2888         .write_end      = f2fs_write_end,
2889         .set_page_dirty = f2fs_set_data_page_dirty,
2890         .invalidatepage = f2fs_invalidate_page,
2891         .releasepage    = f2fs_release_page,
2892         .direct_IO      = f2fs_direct_IO,
2893         .bmap           = f2fs_bmap,
2894 #ifdef CONFIG_MIGRATION
2895         .migratepage    = f2fs_migrate_page,
2896 #endif
2897 };
2898 
2899 void f2fs_clear_page_cache_dirty_tag(struct page *page)
2900 {
2901         struct address_space *mapping = page_mapping(page);
2902         unsigned long flags;
2903 
2904         xa_lock_irqsave(&mapping->i_pages, flags);
2905         __xa_clear_mark(&mapping->i_pages, page_index(page),
2906                                                 PAGECACHE_TAG_DIRTY);
2907         xa_unlock_irqrestore(&mapping->i_pages, flags);
2908 }
2909 
2910 int __init f2fs_init_post_read_processing(void)
2911 {
2912         bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, 0);
2913         if (!bio_post_read_ctx_cache)
2914                 goto fail;
2915         bio_post_read_ctx_pool =
2916                 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS,
2917                                          bio_post_read_ctx_cache);
2918         if (!bio_post_read_ctx_pool)
2919                 goto fail_free_cache;
2920         return 0;
2921 
2922 fail_free_cache:
2923         kmem_cache_destroy(bio_post_read_ctx_cache);
2924 fail:
2925         return -ENOMEM;
2926 }
2927 
2928 void __exit f2fs_destroy_post_read_processing(void)
2929 {
2930         mempool_destroy(bio_post_read_ctx_pool);
2931         kmem_cache_destroy(bio_post_read_ctx_cache);
2932 }
2933 

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