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Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09002 * fs/f2fs/data.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/fs.h>
12#include <linux/f2fs_fs.h>
13#include <linux/buffer_head.h>
14#include <linux/mpage.h>
15#include <linux/writeback.h>
16#include <linux/backing-dev.h>
Chao Yu8f46dca2015-07-14 18:56:10 +080017#include <linux/pagevec.h>
Jaegeuk Kimeb47b802012-11-02 17:10:12 +090018#include <linux/blkdev.h>
19#include <linux/bio.h>
Geert Uytterhoeven690e4a32012-12-19 22:19:30 +010020#include <linux/prefetch.h>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080021#include <linux/uio.h>
Jaegeuk Kimf1e88662015-04-09 11:20:42 -070022#include <linux/cleancache.h>
Jaegeuk Kimeb47b802012-11-02 17:10:12 +090023
24#include "f2fs.h"
25#include "node.h"
26#include "segment.h"
Jaegeuk Kimdb9f7c12014-12-17 20:04:08 -080027#include "trace.h"
Namjae Jeon848753a2013-04-23 16:38:02 +090028#include <trace/events/f2fs.h>
Jaegeuk Kimeb47b802012-11-02 17:10:12 +090029
Christoph Hellwig4246a0b2015-07-20 15:29:37 +020030static void f2fs_read_end_io(struct bio *bio)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090031{
Linus Torvaldsf5688492014-01-30 11:19:05 -080032 struct bio_vec *bvec;
33 int i;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090034
Chao Yu12377022015-05-25 18:03:38 +080035 if (f2fs_bio_encrypted(bio)) {
Christoph Hellwig4246a0b2015-07-20 15:29:37 +020036 if (bio->bi_error) {
Chao Yu12377022015-05-25 18:03:38 +080037 f2fs_release_crypto_ctx(bio->bi_private);
38 } else {
39 f2fs_end_io_crypto_work(bio->bi_private, bio);
40 return;
41 }
42 }
43
Linus Torvaldsf5688492014-01-30 11:19:05 -080044 bio_for_each_segment_all(bvec, bio, i) {
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090045 struct page *page = bvec->bv_page;
46
Christoph Hellwig4246a0b2015-07-20 15:29:37 +020047 if (!bio->bi_error) {
Linus Torvaldsf5688492014-01-30 11:19:05 -080048 SetPageUptodate(page);
49 } else {
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090050 ClearPageUptodate(page);
51 SetPageError(page);
52 }
53 unlock_page(page);
Linus Torvaldsf5688492014-01-30 11:19:05 -080054 }
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090055 bio_put(bio);
56}
57
Christoph Hellwig4246a0b2015-07-20 15:29:37 +020058static void f2fs_write_end_io(struct bio *bio)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090059{
Jaegeuk Kim1b1f5592014-02-03 10:50:22 +090060 struct f2fs_sb_info *sbi = bio->bi_private;
Linus Torvaldsf5688492014-01-30 11:19:05 -080061 struct bio_vec *bvec;
62 int i;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090063
Linus Torvaldsf5688492014-01-30 11:19:05 -080064 bio_for_each_segment_all(bvec, bio, i) {
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090065 struct page *page = bvec->bv_page;
66
Jaegeuk Kim4375a332015-04-23 12:04:33 -070067 f2fs_restore_and_release_control_page(&page);
68
Christoph Hellwig4246a0b2015-07-20 15:29:37 +020069 if (unlikely(bio->bi_error)) {
Jaegeuk Kimcf779ca2014-08-11 18:37:46 -070070 set_page_dirty(page);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090071 set_bit(AS_EIO, &page->mapping->flags);
Jaegeuk Kim744602c2014-01-24 09:42:16 +090072 f2fs_stop_checkpoint(sbi);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090073 }
74 end_page_writeback(page);
75 dec_page_count(sbi, F2FS_WRITEBACK);
Linus Torvaldsf5688492014-01-30 11:19:05 -080076 }
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090077
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +090078 if (!get_pages(sbi, F2FS_WRITEBACK) &&
79 !list_empty(&sbi->cp_wait.task_list))
80 wake_up(&sbi->cp_wait);
81
82 bio_put(bio);
83}
84
Gu Zheng940a6d32013-12-20 17:39:59 +080085/*
86 * Low-level block read/write IO operations.
87 */
88static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
89 int npages, bool is_read)
90{
91 struct bio *bio;
92
Jaegeuk Kim740432f2015-08-14 11:43:56 -070093 bio = f2fs_bio_alloc(npages);
Gu Zheng940a6d32013-12-20 17:39:59 +080094
95 bio->bi_bdev = sbi->sb->s_bdev;
Chao Yu55cf9cb2014-09-15 18:01:10 +080096 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
Gu Zheng940a6d32013-12-20 17:39:59 +080097 bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
Chao Yu12377022015-05-25 18:03:38 +080098 bio->bi_private = is_read ? NULL : sbi;
Gu Zheng940a6d32013-12-20 17:39:59 +080099
100 return bio;
101}
102
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900103static void __submit_merged_bio(struct f2fs_bio_info *io)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900104{
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900105 struct f2fs_io_info *fio = &io->fio;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900106
107 if (!io->bio)
108 return;
109
Jaegeuk Kim6a8f8ca2014-10-29 14:37:22 -0700110 if (is_read_io(fio->rw))
Chao Yu2ace38e2014-12-24 16:08:14 +0800111 trace_f2fs_submit_read_bio(io->sbi->sb, fio, io->bio);
Jaegeuk Kim6a8f8ca2014-10-29 14:37:22 -0700112 else
Chao Yu2ace38e2014-12-24 16:08:14 +0800113 trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900114
Jaegeuk Kim6a8f8ca2014-10-29 14:37:22 -0700115 submit_bio(fio->rw, io->bio);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900116 io->bio = NULL;
117}
118
119void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900120 enum page_type type, int rw)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900121{
122 enum page_type btype = PAGE_TYPE_OF_BIO(type);
123 struct f2fs_bio_info *io;
124
125 io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
126
Chao Yudf0f8dc2014-03-22 14:57:23 +0800127 down_write(&io->io_rwsem);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900128
129 /* change META to META_FLUSH in the checkpoint procedure */
130 if (type >= META_FLUSH) {
131 io->fio.type = META_FLUSH;
Jaegeuk Kim0f7b2ab2014-07-23 09:57:31 -0700132 if (test_opt(sbi, NOBARRIER))
133 io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
134 else
135 io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900136 }
137 __submit_merged_bio(io);
Chao Yudf0f8dc2014-03-22 14:57:23 +0800138 up_write(&io->io_rwsem);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900139}
140
141/*
142 * Fill the locked page with data located in the block address.
143 * Return unlocked page.
144 */
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700145int f2fs_submit_page_bio(struct f2fs_io_info *fio)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900146{
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900147 struct bio *bio;
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700148 struct page *page = fio->encrypted_page ? fio->encrypted_page : fio->page;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900149
Chao Yu2ace38e2014-12-24 16:08:14 +0800150 trace_f2fs_submit_page_bio(page, fio);
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700151 f2fs_trace_ios(fio, 0);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900152
153 /* Allocate a new bio */
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700154 bio = __bio_alloc(fio->sbi, fio->blk_addr, 1, is_read_io(fio->rw));
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900155
156 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
157 bio_put(bio);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900158 return -EFAULT;
159 }
160
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800161 submit_bio(fio->rw, bio);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900162 return 0;
163}
164
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700165void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900166{
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700167 struct f2fs_sb_info *sbi = fio->sbi;
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900168 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900169 struct f2fs_bio_info *io;
Gu Zheng940a6d32013-12-20 17:39:59 +0800170 bool is_read = is_read_io(fio->rw);
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700171 struct page *bio_page;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900172
Gu Zheng940a6d32013-12-20 17:39:59 +0800173 io = is_read ? &sbi->read_io : &sbi->write_io[btype];
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900174
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800175 verify_block_addr(sbi, fio->blk_addr);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900176
Chao Yudf0f8dc2014-03-22 14:57:23 +0800177 down_write(&io->io_rwsem);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900178
Gu Zheng940a6d32013-12-20 17:39:59 +0800179 if (!is_read)
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900180 inc_page_count(sbi, F2FS_WRITEBACK);
181
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800182 if (io->bio && (io->last_block_in_bio != fio->blk_addr - 1 ||
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900183 io->fio.rw != fio->rw))
184 __submit_merged_bio(io);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900185alloc_new:
186 if (io->bio == NULL) {
Jaegeuk Kim90a893c2014-09-22 16:21:07 -0700187 int bio_blocks = MAX_BIO_BLOCKS(sbi);
Gu Zheng940a6d32013-12-20 17:39:59 +0800188
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800189 io->bio = __bio_alloc(sbi, fio->blk_addr, bio_blocks, is_read);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900190 io->fio = *fio;
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900191 }
192
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700193 bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
194
195 if (bio_add_page(io->bio, bio_page, PAGE_CACHE_SIZE, 0) <
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900196 PAGE_CACHE_SIZE) {
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900197 __submit_merged_bio(io);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900198 goto alloc_new;
199 }
200
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800201 io->last_block_in_bio = fio->blk_addr;
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700202 f2fs_trace_ios(fio, 0);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900203
Chao Yudf0f8dc2014-03-22 14:57:23 +0800204 up_write(&io->io_rwsem);
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700205 trace_f2fs_submit_page_mbio(fio->page, fio);
Jaegeuk Kim93dfe2a2013-11-30 12:51:14 +0900206}
207
208/*
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900209 * Lock ordering for the change of data block address:
210 * ->data_page
211 * ->node_page
212 * update block addresses in the node page
213 */
Chao Yu216a6202015-03-19 19:23:32 +0800214void set_data_blkaddr(struct dnode_of_data *dn)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900215{
216 struct f2fs_node *rn;
217 __le32 *addr_array;
218 struct page *node_page = dn->node_page;
219 unsigned int ofs_in_node = dn->ofs_in_node;
220
Yuan Zhong5514f0a2014-01-10 07:26:14 +0000221 f2fs_wait_on_page_writeback(node_page, NODE);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900222
Gu Zheng45590712013-07-15 17:57:38 +0800223 rn = F2FS_NODE(node_page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900224
225 /* Get physical address of data block */
226 addr_array = blkaddr_in_node(rn);
Jaegeuk Kime1509cf2014-12-30 22:57:55 -0800227 addr_array[ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
Jaegeuk Kim12719ae2016-01-07 13:23:12 -0800228 if (set_page_dirty(node_page))
229 dn->node_changed = true;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900230}
231
232int reserve_new_block(struct dnode_of_data *dn)
233{
Jaegeuk Kim40813632014-09-02 15:31:18 -0700234 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900235
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900236 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900237 return -EPERM;
Chao Yucfb271d2013-12-05 17:15:22 +0800238 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900239 return -ENOSPC;
240
Namjae Jeonc01e2852013-04-23 17:00:52 +0900241 trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
242
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900243 dn->data_blkaddr = NEW_ADDR;
Chao Yu216a6202015-03-19 19:23:32 +0800244 set_data_blkaddr(dn);
Jaegeuk Kima18ff062014-01-21 13:32:12 +0900245 mark_inode_dirty(dn->inode);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900246 sync_inode_page(dn);
247 return 0;
248}
249
Huajun Lib6009652013-11-10 23:13:18 +0800250int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
251{
252 bool need_put = dn->inode_page ? false : true;
253 int err;
254
255 err = get_dnode_of_data(dn, index, ALLOC_NODE);
256 if (err)
257 return err;
Jaegeuk Kima8865372013-12-27 17:04:17 +0900258
Huajun Lib6009652013-11-10 23:13:18 +0800259 if (dn->data_blkaddr == NULL_ADDR)
260 err = reserve_new_block(dn);
Jaegeuk Kima8865372013-12-27 17:04:17 +0900261 if (err || need_put)
Huajun Lib6009652013-11-10 23:13:18 +0800262 f2fs_put_dnode(dn);
263 return err;
264}
265
Fan Li759af1c2015-08-05 15:52:16 +0800266int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900267{
Chao Yu028a41e2015-03-19 19:26:02 +0800268 struct extent_info ei;
Fan Li759af1c2015-08-05 15:52:16 +0800269 struct inode *inode = dn->inode;
Chao Yu028a41e2015-03-19 19:26:02 +0800270
Fan Li759af1c2015-08-05 15:52:16 +0800271 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
272 dn->data_blkaddr = ei.blk + index - ei.fofs;
273 return 0;
Chao Yu429511c2015-02-05 17:54:31 +0800274 }
275
Fan Li759af1c2015-08-05 15:52:16 +0800276 return f2fs_reserve_block(dn, index);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900277}
278
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700279struct page *get_read_data_page(struct inode *inode, pgoff_t index,
280 int rw, bool for_write)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900281{
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900282 struct address_space *mapping = inode->i_mapping;
283 struct dnode_of_data dn;
284 struct page *page;
Chao Yucb3bc9e2015-02-05 18:03:40 +0800285 struct extent_info ei;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900286 int err;
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800287 struct f2fs_io_info fio = {
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700288 .sbi = F2FS_I_SB(inode),
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800289 .type = DATA,
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700290 .rw = rw,
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700291 .encrypted_page = NULL,
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800292 };
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900293
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700294 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
295 return read_mapping_page(mapping, index, NULL);
296
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700297 page = f2fs_grab_cache_page(mapping, index, for_write);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900298 if (!page)
299 return ERR_PTR(-ENOMEM);
300
Chao Yucb3bc9e2015-02-05 18:03:40 +0800301 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
302 dn.data_blkaddr = ei.blk + index - ei.fofs;
303 goto got_it;
304 }
305
Jaegeuk Kim650495d2013-05-13 08:38:35 +0900306 set_new_dnode(&dn, inode, NULL, NULL, 0);
307 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
Jaegeuk Kim86531d62015-07-15 13:08:21 -0700308 if (err)
309 goto put_err;
Jaegeuk Kim650495d2013-05-13 08:38:35 +0900310 f2fs_put_dnode(&dn);
311
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900312 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
Jaegeuk Kim86531d62015-07-15 13:08:21 -0700313 err = -ENOENT;
314 goto put_err;
Jaegeuk Kim650495d2013-05-13 08:38:35 +0900315 }
Chao Yucb3bc9e2015-02-05 18:03:40 +0800316got_it:
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700317 if (PageUptodate(page)) {
318 unlock_page(page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900319 return page;
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700320 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900321
Jaegeuk Kimd59ff4d2013-08-20 19:13:07 +0900322 /*
323 * A new dentry page is allocated but not able to be written, since its
324 * new inode page couldn't be allocated due to -ENOSPC.
325 * In such the case, its blkaddr can be remained as NEW_ADDR.
326 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
327 */
328 if (dn.data_blkaddr == NEW_ADDR) {
329 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
330 SetPageUptodate(page);
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700331 unlock_page(page);
Jaegeuk Kimd59ff4d2013-08-20 19:13:07 +0900332 return page;
333 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900334
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -0800335 fio.blk_addr = dn.data_blkaddr;
Jaegeuk Kim05ca3632015-04-23 14:38:15 -0700336 fio.page = page;
337 err = f2fs_submit_page_bio(&fio);
Jaegeuk Kim393ff912013-03-08 21:29:23 +0900338 if (err)
Jaegeuk Kim86531d62015-07-15 13:08:21 -0700339 goto put_err;
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700340 return page;
Jaegeuk Kim86531d62015-07-15 13:08:21 -0700341
342put_err:
343 f2fs_put_page(page, 1);
344 return ERR_PTR(err);
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700345}
Jaegeuk Kim393ff912013-03-08 21:29:23 +0900346
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700347struct page *find_data_page(struct inode *inode, pgoff_t index)
348{
349 struct address_space *mapping = inode->i_mapping;
350 struct page *page;
351
352 page = find_get_page(mapping, index);
353 if (page && PageUptodate(page))
354 return page;
355 f2fs_put_page(page, 0);
356
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700357 page = get_read_data_page(inode, index, READ_SYNC, false);
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700358 if (IS_ERR(page))
359 return page;
360
361 if (PageUptodate(page))
362 return page;
363
364 wait_on_page_locked(page);
365 if (unlikely(!PageUptodate(page))) {
366 f2fs_put_page(page, 0);
367 return ERR_PTR(-EIO);
368 }
369 return page;
370}
371
372/*
373 * If it tries to access a hole, return an error.
374 * Because, the callers, functions in dir.c and GC, should be able to know
375 * whether this page exists or not.
376 */
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700377struct page *get_lock_data_page(struct inode *inode, pgoff_t index,
378 bool for_write)
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700379{
380 struct address_space *mapping = inode->i_mapping;
381 struct page *page;
382repeat:
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700383 page = get_read_data_page(inode, index, READ_SYNC, for_write);
Jaegeuk Kim43f3eae2015-04-30 17:00:33 -0700384 if (IS_ERR(page))
385 return page;
386
387 /* wait for read completion */
Jaegeuk Kim393ff912013-03-08 21:29:23 +0900388 lock_page(page);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900389 if (unlikely(!PageUptodate(page))) {
Jaegeuk Kim393ff912013-03-08 21:29:23 +0900390 f2fs_put_page(page, 1);
391 return ERR_PTR(-EIO);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900392 }
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900393 if (unlikely(page->mapping != mapping)) {
Jaegeuk Kimafcb7ca02013-04-26 11:55:17 +0900394 f2fs_put_page(page, 1);
395 goto repeat;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900396 }
397 return page;
398}
399
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +0900400/*
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900401 * Caller ensures that this data page is never allocated.
402 * A new zero-filled data page is allocated in the page cache.
Jaegeuk Kim39936832012-11-22 16:21:29 +0900403 *
Chao Yu4f4124d2013-12-21 18:02:14 +0800404 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
405 * f2fs_unlock_op().
Chao Yu470f00e2015-07-14 18:14:06 +0800406 * Note that, ipage is set only by make_empty_dir, and if any error occur,
407 * ipage should be released by this function.
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900408 */
Jaegeuk Kim64aa7ed2013-05-20 09:55:50 +0900409struct page *get_new_data_page(struct inode *inode,
Jaegeuk Kima8865372013-12-27 17:04:17 +0900410 struct page *ipage, pgoff_t index, bool new_i_size)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900411{
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900412 struct address_space *mapping = inode->i_mapping;
413 struct page *page;
414 struct dnode_of_data dn;
415 int err;
Jaegeuk Kim76121182016-01-01 22:03:47 -0800416
Jaegeuk Kima56c7c62015-10-09 15:11:38 -0700417 page = f2fs_grab_cache_page(mapping, index, true);
Chao Yu470f00e2015-07-14 18:14:06 +0800418 if (!page) {
419 /*
420 * before exiting, we should make sure ipage will be released
421 * if any error occur.
422 */
423 f2fs_put_page(ipage, 1);
Jaegeuk Kim01f28612015-04-29 11:18:42 -0700424 return ERR_PTR(-ENOMEM);
Chao Yu470f00e2015-07-14 18:14:06 +0800425 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900426
Jaegeuk Kima8865372013-12-27 17:04:17 +0900427 set_new_dnode(&dn, inode, ipage, NULL, 0);
Huajun Lib6009652013-11-10 23:13:18 +0800428 err = f2fs_reserve_block(&dn, index);
Jaegeuk Kim01f28612015-04-29 11:18:42 -0700429 if (err) {
430 f2fs_put_page(page, 1);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900431 return ERR_PTR(err);
Jaegeuk Kima8865372013-12-27 17:04:17 +0900432 }
Jaegeuk Kim01f28612015-04-29 11:18:42 -0700433 if (!ipage)
434 f2fs_put_dnode(&dn);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900435
436 if (PageUptodate(page))
Jaegeuk Kim01f28612015-04-29 11:18:42 -0700437 goto got_it;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900438
439 if (dn.data_blkaddr == NEW_ADDR) {
440 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
Jaegeuk Kim393ff912013-03-08 21:29:23 +0900441 SetPageUptodate(page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900442 } else {
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700443 f2fs_put_page(page, 1);
Jaegeuk Kima8865372013-12-27 17:04:17 +0900444
Jaegeuk Kim76121182016-01-01 22:03:47 -0800445 /* if ipage exists, blkaddr should be NEW_ADDR */
446 f2fs_bug_on(F2FS_I_SB(inode), ipage);
447 page = get_lock_data_page(inode, index, true);
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700448 if (IS_ERR(page))
Jaegeuk Kim76121182016-01-01 22:03:47 -0800449 return page;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900450 }
Jaegeuk Kim01f28612015-04-29 11:18:42 -0700451got_it:
Chao Yu9edcdab2015-09-11 14:43:52 +0800452 if (new_i_size && i_size_read(inode) <
453 ((loff_t)(index + 1) << PAGE_CACHE_SHIFT)) {
454 i_size_write(inode, ((loff_t)(index + 1) << PAGE_CACHE_SHIFT));
Jaegeuk Kim699489b2013-06-07 22:08:23 +0900455 /* Only the directory inode sets new_i_size */
456 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900457 }
458 return page;
459}
460
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900461static int __allocate_data_block(struct dnode_of_data *dn)
462{
Jaegeuk Kim40813632014-09-02 15:31:18 -0700463 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
Jaegeuk Kim976e4c52014-09-15 19:32:16 -0700464 struct f2fs_inode_info *fi = F2FS_I(dn->inode);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900465 struct f2fs_summary sum;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900466 struct node_info ni;
Jaegeuk Kim38aa0882015-01-05 16:02:20 -0800467 int seg = CURSEG_WARM_DATA;
Jaegeuk Kim976e4c52014-09-15 19:32:16 -0700468 pgoff_t fofs;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900469
470 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
471 return -EPERM;
Chao Yudf6136e2015-03-23 10:33:37 +0800472
473 dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
474 if (dn->data_blkaddr == NEW_ADDR)
475 goto alloc;
476
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900477 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
478 return -ENOSPC;
479
Chao Yudf6136e2015-03-23 10:33:37 +0800480alloc:
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900481 get_node_info(sbi, dn->nid, &ni);
482 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
483
Jaegeuk Kim38aa0882015-01-05 16:02:20 -0800484 if (dn->ofs_in_node == 0 && dn->inode_page == dn->node_page)
485 seg = CURSEG_DIRECT_IO;
486
Chao Yudf6136e2015-03-23 10:33:37 +0800487 allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr,
488 &sum, seg);
Chao Yu216a6202015-03-19 19:23:32 +0800489 set_data_blkaddr(dn);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900490
Jaegeuk Kim976e4c52014-09-15 19:32:16 -0700491 /* update i_size */
492 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
493 dn->ofs_in_node;
Chao Yu9edcdab2015-09-11 14:43:52 +0800494 if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_CACHE_SHIFT))
495 i_size_write(dn->inode,
496 ((loff_t)(fofs + 1) << PAGE_CACHE_SHIFT));
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900497 return 0;
498}
499
Chao Yu6d5a1492015-12-24 18:04:56 +0800500static int __allocate_data_blocks(struct inode *inode, loff_t offset,
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800501 size_t count)
502{
503 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
504 struct dnode_of_data dn;
505 u64 start = F2FS_BYTES_TO_BLK(offset);
506 u64 len = F2FS_BYTES_TO_BLK(count);
507 bool allocated;
508 u64 end_offset;
Chao Yu6d5a1492015-12-24 18:04:56 +0800509 int err = 0;
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800510
511 while (len) {
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800512 f2fs_lock_op(sbi);
513
514 /* When reading holes, we need its node page */
515 set_new_dnode(&dn, inode, NULL, NULL, 0);
Chao Yu6d5a1492015-12-24 18:04:56 +0800516 err = get_dnode_of_data(&dn, start, ALLOC_NODE);
517 if (err)
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800518 goto out;
519
520 allocated = false;
521 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
522
523 while (dn.ofs_in_node < end_offset && len) {
Chao Yud6d4f1c2015-03-12 17:04:24 +0800524 block_t blkaddr;
525
Chao Yu6d5a1492015-12-24 18:04:56 +0800526 if (unlikely(f2fs_cp_error(sbi))) {
527 err = -EIO;
Chao Yuf9811702015-09-21 20:17:52 +0800528 goto sync_out;
Chao Yu6d5a1492015-12-24 18:04:56 +0800529 }
Chao Yuf9811702015-09-21 20:17:52 +0800530
Chao Yud6d4f1c2015-03-12 17:04:24 +0800531 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
Chao Yudf6136e2015-03-23 10:33:37 +0800532 if (blkaddr == NULL_ADDR || blkaddr == NEW_ADDR) {
Chao Yu6d5a1492015-12-24 18:04:56 +0800533 err = __allocate_data_block(&dn);
534 if (err)
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800535 goto sync_out;
536 allocated = true;
537 }
538 len--;
539 start++;
540 dn.ofs_in_node++;
541 }
542
543 if (allocated)
544 sync_inode_page(&dn);
545
546 f2fs_put_dnode(&dn);
547 f2fs_unlock_op(sbi);
Jaegeuk Kim2a340762015-12-22 13:23:35 -0800548
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -0800549 f2fs_balance_fs(sbi, dn.node_changed);
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800550 }
Chao Yu6d5a1492015-12-24 18:04:56 +0800551 return err;
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800552
553sync_out:
554 if (allocated)
555 sync_inode_page(&dn);
556 f2fs_put_dnode(&dn);
557out:
558 f2fs_unlock_op(sbi);
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -0800559 f2fs_balance_fs(sbi, dn.node_changed);
Chao Yu6d5a1492015-12-24 18:04:56 +0800560 return err;
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800561}
562
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +0900563/*
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700564 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
565 * f2fs_map_blocks structure.
Chao Yu4f4124d2013-12-21 18:02:14 +0800566 * If original data blocks are allocated, then give them to blockdev.
567 * Otherwise,
568 * a. preallocate requested block addresses
569 * b. do not use extent cache for better performance
570 * c. give the block addresses to blockdev
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900571 */
Chao Yud323d002015-10-27 09:53:45 +0800572int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
Chao Yue2b4e2b2015-08-19 19:11:19 +0800573 int create, int flag)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900574{
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700575 unsigned int maxblocks = map->m_len;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900576 struct dnode_of_data dn;
Chao Yuf9811702015-09-21 20:17:52 +0800577 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900578 int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
579 pgoff_t pgofs, end_offset;
580 int err = 0, ofs = 1;
Chao Yua2e7d1b2015-02-05 17:50:30 +0800581 struct extent_info ei;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900582 bool allocated = false;
Fan Li7df3a432015-12-17 13:20:59 +0800583 block_t blkaddr;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900584
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700585 map->m_len = 0;
586 map->m_flags = 0;
587
588 /* it only supports block size == page size */
589 pgofs = (pgoff_t)map->m_lblk;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900590
Chao Yu7e4dde72015-02-05 17:51:34 +0800591 if (f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700592 map->m_pblk = ei.blk + pgofs - ei.fofs;
593 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
594 map->m_flags = F2FS_MAP_MAPPED;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900595 goto out;
Chao Yua2e7d1b2015-02-05 17:50:30 +0800596 }
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900597
Jaegeuk Kim59b802e2015-02-09 12:09:53 -0800598 if (create)
Chao Yu3104af32015-12-23 17:11:43 +0800599 f2fs_lock_op(sbi);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900600
601 /* When reading holes, we need its node page */
602 set_new_dnode(&dn, inode, NULL, NULL, 0);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900603 err = get_dnode_of_data(&dn, pgofs, mode);
Jaegeuk Kim1ec79082013-12-26 16:55:22 +0900604 if (err) {
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900605 if (err == -ENOENT)
606 err = 0;
607 goto unlock_out;
Namjae Jeon848753a2013-04-23 16:38:02 +0900608 }
Chao Yu973163f2015-09-18 16:51:51 +0800609
610 if (dn.data_blkaddr == NEW_ADDR || dn.data_blkaddr == NULL_ADDR) {
611 if (create) {
Chao Yuf9811702015-09-21 20:17:52 +0800612 if (unlikely(f2fs_cp_error(sbi))) {
613 err = -EIO;
614 goto put_out;
615 }
Chao Yu973163f2015-09-18 16:51:51 +0800616 err = __allocate_data_block(&dn);
617 if (err)
618 goto put_out;
619 allocated = true;
620 map->m_flags = F2FS_MAP_NEW;
621 } else {
622 if (flag != F2FS_GET_BLOCK_FIEMAP ||
623 dn.data_blkaddr != NEW_ADDR) {
624 if (flag == F2FS_GET_BLOCK_BMAP)
625 err = -ENOENT;
626 goto put_out;
627 }
628
629 /*
630 * preallocated unwritten block should be mapped
631 * for fiemap.
632 */
633 if (dn.data_blkaddr == NEW_ADDR)
634 map->m_flags = F2FS_MAP_UNWRITTEN;
Chao Yue2b4e2b2015-08-19 19:11:19 +0800635 }
Chao Yue2b4e2b2015-08-19 19:11:19 +0800636 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900637
Chao Yu973163f2015-09-18 16:51:51 +0800638 map->m_flags |= F2FS_MAP_MAPPED;
639 map->m_pblk = dn.data_blkaddr;
640 map->m_len = 1;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900641
Chao Yu6403eb12014-04-26 19:59:52 +0800642 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900643 dn.ofs_in_node++;
644 pgofs++;
645
646get_next:
Fan Li7df3a432015-12-17 13:20:59 +0800647 if (map->m_len >= maxblocks)
648 goto sync_out;
649
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900650 if (dn.ofs_in_node >= end_offset) {
651 if (allocated)
652 sync_inode_page(&dn);
653 allocated = false;
654 f2fs_put_dnode(&dn);
655
Chao Yu3104af32015-12-23 17:11:43 +0800656 if (create) {
657 f2fs_unlock_op(sbi);
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -0800658 f2fs_balance_fs(sbi, dn.node_changed);
Chao Yu3104af32015-12-23 17:11:43 +0800659 f2fs_lock_op(sbi);
660 }
661
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900662 set_new_dnode(&dn, inode, NULL, NULL, 0);
663 err = get_dnode_of_data(&dn, pgofs, mode);
Jaegeuk Kim1ec79082013-12-26 16:55:22 +0900664 if (err) {
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900665 if (err == -ENOENT)
666 err = 0;
667 goto unlock_out;
668 }
Chao Yue2b4e2b2015-08-19 19:11:19 +0800669
Chao Yu6403eb12014-04-26 19:59:52 +0800670 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900671 }
672
Fan Li7df3a432015-12-17 13:20:59 +0800673 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
Chao Yu973163f2015-09-18 16:51:51 +0800674
Fan Li7df3a432015-12-17 13:20:59 +0800675 if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR) {
676 if (create) {
677 if (unlikely(f2fs_cp_error(sbi))) {
678 err = -EIO;
679 goto sync_out;
Chao Yu973163f2015-09-18 16:51:51 +0800680 }
Fan Li7df3a432015-12-17 13:20:59 +0800681 err = __allocate_data_block(&dn);
682 if (err)
683 goto sync_out;
684 allocated = true;
685 map->m_flags |= F2FS_MAP_NEW;
686 blkaddr = dn.data_blkaddr;
687 } else {
688 /*
689 * we only merge preallocated unwritten blocks
690 * for fiemap.
691 */
692 if (flag != F2FS_GET_BLOCK_FIEMAP ||
693 blkaddr != NEW_ADDR)
694 goto sync_out;
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900695 }
696 }
Fan Li7df3a432015-12-17 13:20:59 +0800697
698 /* Give more consecutive addresses for the readahead */
699 if ((map->m_pblk != NEW_ADDR &&
700 blkaddr == (map->m_pblk + ofs)) ||
701 (map->m_pblk == NEW_ADDR &&
702 blkaddr == NEW_ADDR)) {
703 ofs++;
704 dn.ofs_in_node++;
705 pgofs++;
706 map->m_len++;
707 goto get_next;
708 }
709
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900710sync_out:
711 if (allocated)
712 sync_inode_page(&dn);
713put_out:
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900714 f2fs_put_dnode(&dn);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900715unlock_out:
Jaegeuk Kim2a340762015-12-22 13:23:35 -0800716 if (create) {
Chao Yu3104af32015-12-23 17:11:43 +0800717 f2fs_unlock_op(sbi);
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -0800718 f2fs_balance_fs(sbi, dn.node_changed);
Jaegeuk Kim2a340762015-12-22 13:23:35 -0800719 }
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900720out:
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700721 trace_f2fs_map_blocks(inode, map, err);
Jaegeuk Kimbfad7c22013-12-16 19:04:05 +0900722 return err;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +0900723}
724
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700725static int __get_data_block(struct inode *inode, sector_t iblock,
Chao Yue2b4e2b2015-08-19 19:11:19 +0800726 struct buffer_head *bh, int create, int flag)
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700727{
728 struct f2fs_map_blocks map;
729 int ret;
730
731 map.m_lblk = iblock;
732 map.m_len = bh->b_size >> inode->i_blkbits;
733
Chao Yue2b4e2b2015-08-19 19:11:19 +0800734 ret = f2fs_map_blocks(inode, &map, create, flag);
Jaegeuk Kim003a3e12015-04-06 19:55:34 -0700735 if (!ret) {
736 map_bh(bh, inode->i_sb, map.m_pblk);
737 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
738 bh->b_size = map.m_len << inode->i_blkbits;
739 }
740 return ret;
741}
742
Jaegeuk Kimccfb3002014-06-13 13:02:11 +0900743static int get_data_block(struct inode *inode, sector_t iblock,
Chao Yue2b4e2b2015-08-19 19:11:19 +0800744 struct buffer_head *bh_result, int create, int flag)
Jaegeuk Kimccfb3002014-06-13 13:02:11 +0900745{
Chao Yue2b4e2b2015-08-19 19:11:19 +0800746 return __get_data_block(inode, iblock, bh_result, create, flag);
Jaegeuk Kimccfb3002014-06-13 13:02:11 +0900747}
748
Chao Yue2b4e2b2015-08-19 19:11:19 +0800749static int get_data_block_dio(struct inode *inode, sector_t iblock,
Jaegeuk Kimccfb3002014-06-13 13:02:11 +0900750 struct buffer_head *bh_result, int create)
751{
Chao Yue2b4e2b2015-08-19 19:11:19 +0800752 return __get_data_block(inode, iblock, bh_result, create,
753 F2FS_GET_BLOCK_DIO);
754}
755
756static int get_data_block_bmap(struct inode *inode, sector_t iblock,
757 struct buffer_head *bh_result, int create)
758{
Yunlei He179448b2015-12-28 21:48:32 +0800759 /* Block number less than F2FS MAX BLOCKS */
Chao Yue0afc4d2015-12-31 14:35:37 +0800760 if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
Yunlei He179448b2015-12-28 21:48:32 +0800761 return -EFBIG;
762
Chao Yue2b4e2b2015-08-19 19:11:19 +0800763 return __get_data_block(inode, iblock, bh_result, create,
764 F2FS_GET_BLOCK_BMAP);
Jaegeuk Kimccfb3002014-06-13 13:02:11 +0900765}
766
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700767static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
768{
769 return (offset >> inode->i_blkbits);
770}
771
772static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
773{
774 return (blk << inode->i_blkbits);
775}
776
Jaegeuk Kim9ab70132014-06-08 04:30:14 +0900777int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
778 u64 start, u64 len)
779{
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700780 struct buffer_head map_bh;
781 sector_t start_blk, last_blk;
Fan Lide1475c2016-01-04 15:56:50 +0800782 loff_t isize;
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700783 u64 logical = 0, phys = 0, size = 0;
784 u32 flags = 0;
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700785 int ret = 0;
786
787 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
788 if (ret)
789 return ret;
790
Jaegeuk Kim67f8cf3c2015-10-15 11:34:49 -0700791 if (f2fs_has_inline_data(inode)) {
792 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
793 if (ret != -EAGAIN)
794 return ret;
795 }
796
Al Viro59551022016-01-22 15:40:57 -0500797 inode_lock(inode);
Fan Lide1475c2016-01-04 15:56:50 +0800798
799 isize = i_size_read(inode);
Fan Li9a950d52015-12-26 18:07:41 +0800800 if (start >= isize)
801 goto out;
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700802
Fan Li9a950d52015-12-26 18:07:41 +0800803 if (start + len > isize)
804 len = isize - start;
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700805
806 if (logical_to_blk(inode, len) == 0)
807 len = blk_to_logical(inode, 1);
808
809 start_blk = logical_to_blk(inode, start);
810 last_blk = logical_to_blk(inode, start + len - 1);
Fan Li9a950d52015-12-26 18:07:41 +0800811
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700812next:
813 memset(&map_bh, 0, sizeof(struct buffer_head));
814 map_bh.b_size = len;
815
Chao Yue2b4e2b2015-08-19 19:11:19 +0800816 ret = get_data_block(inode, start_blk, &map_bh, 0,
817 F2FS_GET_BLOCK_FIEMAP);
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700818 if (ret)
819 goto out;
820
821 /* HOLE */
822 if (!buffer_mapped(&map_bh)) {
Fan Li9a950d52015-12-26 18:07:41 +0800823 /* Go through holes util pass the EOF */
824 if (blk_to_logical(inode, start_blk++) < isize)
825 goto prep_next;
826 /* Found a hole beyond isize means no more extents.
827 * Note that the premise is that filesystems don't
828 * punch holes beyond isize and keep size unchanged.
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700829 */
Fan Li9a950d52015-12-26 18:07:41 +0800830 flags |= FIEMAP_EXTENT_LAST;
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700831 }
Fan Li9a950d52015-12-26 18:07:41 +0800832
Chao Yuda5af122016-01-08 20:19:27 +0800833 if (size) {
834 if (f2fs_encrypted_inode(inode))
835 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
836
Fan Li9a950d52015-12-26 18:07:41 +0800837 ret = fiemap_fill_next_extent(fieinfo, logical,
838 phys, size, flags);
Chao Yuda5af122016-01-08 20:19:27 +0800839 }
Fan Li9a950d52015-12-26 18:07:41 +0800840
841 if (start_blk > last_blk || ret)
842 goto out;
843
844 logical = blk_to_logical(inode, start_blk);
845 phys = blk_to_logical(inode, map_bh.b_blocknr);
846 size = map_bh.b_size;
847 flags = 0;
848 if (buffer_unwritten(&map_bh))
849 flags = FIEMAP_EXTENT_UNWRITTEN;
850
851 start_blk += logical_to_blk(inode, size);
852
853prep_next:
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700854 cond_resched();
855 if (fatal_signal_pending(current))
856 ret = -EINTR;
857 else
858 goto next;
859out:
860 if (ret == 1)
861 ret = 0;
862
Al Viro59551022016-01-22 15:40:57 -0500863 inode_unlock(inode);
Jaegeuk Kim7f63eb72015-05-08 19:30:32 -0700864 return ret;
Jaegeuk Kim9ab70132014-06-08 04:30:14 +0900865}
866
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700867/*
868 * This function was originally taken from fs/mpage.c, and customized for f2fs.
869 * Major change was from block_size == page_size in f2fs by default.
870 */
871static int f2fs_mpage_readpages(struct address_space *mapping,
872 struct list_head *pages, struct page *page,
873 unsigned nr_pages)
874{
875 struct bio *bio = NULL;
876 unsigned page_idx;
877 sector_t last_block_in_bio = 0;
878 struct inode *inode = mapping->host;
879 const unsigned blkbits = inode->i_blkbits;
880 const unsigned blocksize = 1 << blkbits;
881 sector_t block_in_file;
882 sector_t last_block;
883 sector_t last_block_in_file;
884 sector_t block_nr;
885 struct block_device *bdev = inode->i_sb->s_bdev;
886 struct f2fs_map_blocks map;
887
888 map.m_pblk = 0;
889 map.m_lblk = 0;
890 map.m_len = 0;
891 map.m_flags = 0;
892
893 for (page_idx = 0; nr_pages; page_idx++, nr_pages--) {
894
895 prefetchw(&page->flags);
896 if (pages) {
897 page = list_entry(pages->prev, struct page, lru);
898 list_del(&page->lru);
899 if (add_to_page_cache_lru(page, mapping,
900 page->index, GFP_KERNEL))
901 goto next_page;
902 }
903
904 block_in_file = (sector_t)page->index;
905 last_block = block_in_file + nr_pages;
906 last_block_in_file = (i_size_read(inode) + blocksize - 1) >>
907 blkbits;
908 if (last_block > last_block_in_file)
909 last_block = last_block_in_file;
910
911 /*
912 * Map blocks using the previous result first.
913 */
914 if ((map.m_flags & F2FS_MAP_MAPPED) &&
915 block_in_file > map.m_lblk &&
916 block_in_file < (map.m_lblk + map.m_len))
917 goto got_it;
918
919 /*
920 * Then do more f2fs_map_blocks() calls until we are
921 * done with this page.
922 */
923 map.m_flags = 0;
924
925 if (block_in_file < last_block) {
926 map.m_lblk = block_in_file;
927 map.m_len = last_block - block_in_file;
928
Chao Yu46c9e142015-09-18 16:54:16 +0800929 if (f2fs_map_blocks(inode, &map, 0,
930 F2FS_GET_BLOCK_READ))
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700931 goto set_error_page;
932 }
933got_it:
934 if ((map.m_flags & F2FS_MAP_MAPPED)) {
935 block_nr = map.m_pblk + block_in_file - map.m_lblk;
936 SetPageMappedToDisk(page);
937
938 if (!PageUptodate(page) && !cleancache_get_page(page)) {
939 SetPageUptodate(page);
940 goto confused;
941 }
942 } else {
943 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
944 SetPageUptodate(page);
945 unlock_page(page);
946 goto next_page;
947 }
948
949 /*
950 * This page will go to BIO. Do we need to send this
951 * BIO off first?
952 */
953 if (bio && (last_block_in_bio != block_nr - 1)) {
954submit_and_realloc:
955 submit_bio(READ, bio);
956 bio = NULL;
957 }
958 if (bio == NULL) {
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700959 struct f2fs_crypto_ctx *ctx = NULL;
960
961 if (f2fs_encrypted_inode(inode) &&
962 S_ISREG(inode->i_mode)) {
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700963
964 ctx = f2fs_get_crypto_ctx(inode);
965 if (IS_ERR(ctx))
966 goto set_error_page;
967
968 /* wait the page to be moved by cleaning */
Chao Yu08b39fb2015-10-08 13:27:34 +0800969 f2fs_wait_on_encrypted_page_writeback(
970 F2FS_I_SB(inode), block_nr);
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700971 }
972
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700973 bio = bio_alloc(GFP_KERNEL,
Kent Overstreetb54ffb72015-05-19 14:31:01 +0200974 min_t(int, nr_pages, BIO_MAX_PAGES));
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700975 if (!bio) {
976 if (ctx)
977 f2fs_release_crypto_ctx(ctx);
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700978 goto set_error_page;
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700979 }
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700980 bio->bi_bdev = bdev;
981 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(block_nr);
Chao Yu12377022015-05-25 18:03:38 +0800982 bio->bi_end_io = f2fs_read_end_io;
Jaegeuk Kim4375a332015-04-23 12:04:33 -0700983 bio->bi_private = ctx;
Jaegeuk Kimf1e88662015-04-09 11:20:42 -0700984 }
985
986 if (bio_add_page(bio, page, blocksize, 0) < blocksize)
987 goto submit_and_realloc;
988
989 last_block_in_bio = block_nr;
990 goto next_page;
991set_error_page:
992 SetPageError(page);
993 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
994 unlock_page(page);
995 goto next_page;
996confused:
997 if (bio) {
998 submit_bio(READ, bio);
999 bio = NULL;
1000 }
1001 unlock_page(page);
1002next_page:
1003 if (pages)
1004 page_cache_release(page);
1005 }
1006 BUG_ON(pages && !list_empty(pages));
1007 if (bio)
1008 submit_bio(READ, bio);
1009 return 0;
1010}
1011
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001012static int f2fs_read_data_page(struct file *file, struct page *page)
1013{
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001014 struct inode *inode = page->mapping->host;
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001015 int ret = -EAGAIN;
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001016
Chao Yuc20e89c2014-05-06 16:53:08 +08001017 trace_f2fs_readpage(page, DATA);
1018
arter97e1c42042014-08-06 23:22:50 +09001019 /* If the file has inline data, try to read it directly */
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001020 if (f2fs_has_inline_data(inode))
1021 ret = f2fs_read_inline_data(inode, page);
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001022 if (ret == -EAGAIN)
Jaegeuk Kimf1e88662015-04-09 11:20:42 -07001023 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1);
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001024 return ret;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001025}
1026
1027static int f2fs_read_data_pages(struct file *file,
1028 struct address_space *mapping,
1029 struct list_head *pages, unsigned nr_pages)
1030{
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001031 struct inode *inode = file->f_mapping->host;
Chao Yub8c29402015-10-12 17:02:26 +08001032 struct page *page = list_entry(pages->prev, struct page, lru);
1033
1034 trace_f2fs_readpages(inode, page, nr_pages);
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001035
1036 /* If the file has inline data, skip readpages */
1037 if (f2fs_has_inline_data(inode))
1038 return 0;
1039
Jaegeuk Kimf1e88662015-04-09 11:20:42 -07001040 return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001041}
1042
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001043int do_write_data_page(struct f2fs_io_info *fio)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001044{
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001045 struct page *page = fio->page;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001046 struct inode *inode = page->mapping->host;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001047 struct dnode_of_data dn;
1048 int err = 0;
1049
1050 set_new_dnode(&dn, inode, NULL, NULL, 0);
Jaegeuk Kim266e97a2013-02-26 13:10:46 +09001051 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001052 if (err)
1053 return err;
1054
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -08001055 fio->blk_addr = dn.data_blkaddr;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001056
1057 /* This page is already truncated */
Jaegeuk Kim2bca1e22015-02-25 19:25:01 -08001058 if (fio->blk_addr == NULL_ADDR) {
1059 ClearPageUptodate(page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001060 goto out_writepage;
Jaegeuk Kim2bca1e22015-02-25 19:25:01 -08001061 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001062
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001063 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) {
Chao Yu08b39fb2015-10-08 13:27:34 +08001064
1065 /* wait for GCed encrypted page writeback */
1066 f2fs_wait_on_encrypted_page_writeback(F2FS_I_SB(inode),
1067 fio->blk_addr);
1068
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001069 fio->encrypted_page = f2fs_encrypt(inode, fio->page);
1070 if (IS_ERR(fio->encrypted_page)) {
1071 err = PTR_ERR(fio->encrypted_page);
1072 goto out_writepage;
1073 }
1074 }
1075
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001076 set_page_writeback(page);
1077
1078 /*
1079 * If current allocation needs SSR,
1080 * it had better in-place writes for updated data.
1081 */
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -08001082 if (unlikely(fio->blk_addr != NEW_ADDR &&
Haicheng Lib25958b2013-06-13 16:59:29 +08001083 !is_cold_data(page) &&
Chao Yu2da3e0272015-10-28 17:56:14 +08001084 !IS_ATOMIC_WRITTEN_PAGE(page) &&
Haicheng Lib25958b2013-06-13 16:59:29 +08001085 need_inplace_update(inode))) {
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001086 rewrite_data_page(fio);
Jaegeuk Kimfff04f92014-07-25 07:40:59 -07001087 set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE);
Jaegeuk Kim8ce67cb2015-03-17 17:58:08 -07001088 trace_f2fs_do_write_data_page(page, IPU);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001089 } else {
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001090 write_data_page(&dn, fio);
Chao Yu216a6202015-03-19 19:23:32 +08001091 set_data_blkaddr(&dn);
Chao Yu7e4dde72015-02-05 17:51:34 +08001092 f2fs_update_extent_cache(&dn);
Jaegeuk Kim8ce67cb2015-03-17 17:58:08 -07001093 trace_f2fs_do_write_data_page(page, OPU);
Jaegeuk Kimfff04f92014-07-25 07:40:59 -07001094 set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
Jaegeuk Kim3c6c2be2015-03-17 17:16:35 -07001095 if (page->index == 0)
1096 set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001097 }
1098out_writepage:
1099 f2fs_put_dnode(&dn);
1100 return err;
1101}
1102
1103static int f2fs_write_data_page(struct page *page,
1104 struct writeback_control *wbc)
1105{
1106 struct inode *inode = page->mapping->host;
Jaegeuk Kim40813632014-09-02 15:31:18 -07001107 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001108 loff_t i_size = i_size_read(inode);
1109 const pgoff_t end_index = ((unsigned long long) i_size)
1110 >> PAGE_CACHE_SHIFT;
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001111 unsigned offset = 0;
Jaegeuk Kim39936832012-11-22 16:21:29 +09001112 bool need_balance_fs = false;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001113 int err = 0;
Jaegeuk Kim458e6192013-12-11 13:54:01 +09001114 struct f2fs_io_info fio = {
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001115 .sbi = sbi,
Jaegeuk Kim458e6192013-12-11 13:54:01 +09001116 .type = DATA,
Chris Fries6c311ec2014-01-17 14:44:39 -06001117 .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001118 .page = page,
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001119 .encrypted_page = NULL,
Jaegeuk Kim458e6192013-12-11 13:54:01 +09001120 };
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001121
Chao Yuecda0de2014-05-06 16:48:26 +08001122 trace_f2fs_writepage(page, DATA);
1123
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001124 if (page->index < end_index)
Jaegeuk Kim39936832012-11-22 16:21:29 +09001125 goto write;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001126
1127 /*
1128 * If the offset is out-of-range of file size,
1129 * this page does not have to be written to disk.
1130 */
1131 offset = i_size & (PAGE_CACHE_SIZE - 1);
Jaegeuk Kim76f60262014-04-15 16:04:15 +09001132 if ((page->index >= end_index + 1) || !offset)
Jaegeuk Kim39936832012-11-22 16:21:29 +09001133 goto out;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001134
1135 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
Jaegeuk Kim39936832012-11-22 16:21:29 +09001136write:
Chao Yucaf00472015-01-28 17:48:42 +08001137 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001138 goto redirty_out;
Jaegeuk Kim1e843712014-12-09 06:08:59 -08001139 if (f2fs_is_drop_cache(inode))
1140 goto out;
1141 if (f2fs_is_volatile_file(inode) && !wbc->for_reclaim &&
1142 available_free_memory(sbi, BASE_CHECK))
1143 goto redirty_out;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001144
Jaegeuk Kim39936832012-11-22 16:21:29 +09001145 /* Dentry blocks are controlled by checkpoint */
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001146 if (S_ISDIR(inode->i_mode)) {
Jaegeuk Kimcf779ca2014-08-11 18:37:46 -07001147 if (unlikely(f2fs_cp_error(sbi)))
1148 goto redirty_out;
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001149 err = do_write_data_page(&fio);
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001150 goto done;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001151 }
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001152
Jaegeuk Kimcf779ca2014-08-11 18:37:46 -07001153 /* we should bypass data pages to proceed the kworkder jobs */
1154 if (unlikely(f2fs_cp_error(sbi))) {
1155 SetPageError(page);
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001156 goto out;
Jaegeuk Kimcf779ca2014-08-11 18:37:46 -07001157 }
1158
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001159 if (!wbc->for_reclaim)
1160 need_balance_fs = true;
1161 else if (has_not_enough_free_secs(sbi, 0))
Jaegeuk Kim39936832012-11-22 16:21:29 +09001162 goto redirty_out;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001163
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001164 err = -EAGAIN;
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001165 f2fs_lock_op(sbi);
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001166 if (f2fs_has_inline_data(inode))
1167 err = f2fs_write_inline_data(inode, page);
1168 if (err == -EAGAIN)
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001169 err = do_write_data_page(&fio);
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001170 f2fs_unlock_op(sbi);
1171done:
1172 if (err && err != -ENOENT)
1173 goto redirty_out;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001174
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001175 clear_cold_data(page);
Jaegeuk Kim39936832012-11-22 16:21:29 +09001176out:
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001177 inode_dec_dirty_pages(inode);
Jaegeuk Kim2bca1e22015-02-25 19:25:01 -08001178 if (err)
1179 ClearPageUptodate(page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001180 unlock_page(page);
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -08001181 f2fs_balance_fs(sbi, need_balance_fs);
Jaegeuk Kim8d4ea292015-12-31 13:08:02 -08001182 if (wbc->for_reclaim || unlikely(f2fs_cp_error(sbi))) {
Jaegeuk Kim2aea39e2014-04-24 09:49:52 +09001183 f2fs_submit_merged_bio(sbi, DATA, WRITE);
Chao Yuc227f912015-12-16 13:09:20 +08001184 remove_dirty_inode(inode);
Chao Yueb7e8132015-11-10 18:45:07 +08001185 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001186 return 0;
1187
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001188redirty_out:
Jaegeuk Kim76f60262014-04-15 16:04:15 +09001189 redirty_page_for_writepage(wbc, page);
Jaegeuk Kim8618b882014-02-17 19:29:27 +09001190 return AOP_WRITEPAGE_ACTIVATE;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001191}
1192
Namjae Jeonfa9150a2013-01-15 16:45:24 +09001193static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
1194 void *data)
1195{
1196 struct address_space *mapping = data;
1197 int ret = mapping->a_ops->writepage(page, wbc);
1198 mapping_set_error(mapping, ret);
1199 return ret;
1200}
1201
Chao Yu8f46dca2015-07-14 18:56:10 +08001202/*
1203 * This function was copied from write_cche_pages from mm/page-writeback.c.
1204 * The major change is making write step of cold data page separately from
1205 * warm/hot data page.
1206 */
1207static int f2fs_write_cache_pages(struct address_space *mapping,
1208 struct writeback_control *wbc, writepage_t writepage,
1209 void *data)
1210{
1211 int ret = 0;
1212 int done = 0;
1213 struct pagevec pvec;
1214 int nr_pages;
1215 pgoff_t uninitialized_var(writeback_index);
1216 pgoff_t index;
1217 pgoff_t end; /* Inclusive */
1218 pgoff_t done_index;
1219 int cycled;
1220 int range_whole = 0;
1221 int tag;
1222 int step = 0;
1223
1224 pagevec_init(&pvec, 0);
1225next:
1226 if (wbc->range_cyclic) {
1227 writeback_index = mapping->writeback_index; /* prev offset */
1228 index = writeback_index;
1229 if (index == 0)
1230 cycled = 1;
1231 else
1232 cycled = 0;
1233 end = -1;
1234 } else {
1235 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1236 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1237 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1238 range_whole = 1;
1239 cycled = 1; /* ignore range_cyclic tests */
1240 }
1241 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1242 tag = PAGECACHE_TAG_TOWRITE;
1243 else
1244 tag = PAGECACHE_TAG_DIRTY;
1245retry:
1246 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1247 tag_pages_for_writeback(mapping, index, end);
1248 done_index = index;
1249 while (!done && (index <= end)) {
1250 int i;
1251
1252 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
1253 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1);
1254 if (nr_pages == 0)
1255 break;
1256
1257 for (i = 0; i < nr_pages; i++) {
1258 struct page *page = pvec.pages[i];
1259
1260 if (page->index > end) {
1261 done = 1;
1262 break;
1263 }
1264
1265 done_index = page->index;
1266
1267 lock_page(page);
1268
1269 if (unlikely(page->mapping != mapping)) {
1270continue_unlock:
1271 unlock_page(page);
1272 continue;
1273 }
1274
1275 if (!PageDirty(page)) {
1276 /* someone wrote it for us */
1277 goto continue_unlock;
1278 }
1279
Tiezhu Yang737f1892015-07-17 12:56:00 +08001280 if (step == is_cold_data(page))
Chao Yu8f46dca2015-07-14 18:56:10 +08001281 goto continue_unlock;
1282
1283 if (PageWriteback(page)) {
1284 if (wbc->sync_mode != WB_SYNC_NONE)
1285 f2fs_wait_on_page_writeback(page, DATA);
1286 else
1287 goto continue_unlock;
1288 }
1289
1290 BUG_ON(PageWriteback(page));
1291 if (!clear_page_dirty_for_io(page))
1292 goto continue_unlock;
1293
1294 ret = (*writepage)(page, wbc, data);
1295 if (unlikely(ret)) {
1296 if (ret == AOP_WRITEPAGE_ACTIVATE) {
1297 unlock_page(page);
1298 ret = 0;
1299 } else {
1300 done_index = page->index + 1;
1301 done = 1;
1302 break;
1303 }
1304 }
1305
1306 if (--wbc->nr_to_write <= 0 &&
1307 wbc->sync_mode == WB_SYNC_NONE) {
1308 done = 1;
1309 break;
1310 }
1311 }
1312 pagevec_release(&pvec);
1313 cond_resched();
1314 }
1315
1316 if (step < 1) {
1317 step++;
1318 goto next;
1319 }
1320
1321 if (!cycled && !done) {
1322 cycled = 1;
1323 index = 0;
1324 end = writeback_index - 1;
1325 goto retry;
1326 }
1327 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1328 mapping->writeback_index = done_index;
1329
1330 return ret;
1331}
1332
Jaegeuk Kim25ca9232012-11-28 16:12:41 +09001333static int f2fs_write_data_pages(struct address_space *mapping,
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001334 struct writeback_control *wbc)
1335{
1336 struct inode *inode = mapping->host;
Jaegeuk Kim40813632014-09-02 15:31:18 -07001337 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim5463e7c2015-04-21 10:40:54 -07001338 bool locked = false;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001339 int ret;
Jaegeuk Kim50c8cdb2014-03-18 13:47:11 +09001340 long diff;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001341
Chao Yue5748432014-05-06 16:51:24 +08001342 trace_f2fs_writepages(mapping->host, wbc, DATA);
1343
P J Pcfb185a2013-04-03 11:38:00 +09001344 /* deal with chardevs and other special file */
1345 if (!mapping->a_ops->writepage)
1346 return 0;
1347
Chao Yu6a290542015-07-17 18:02:39 +08001348 /* skip writing if there is no dirty page in this inode */
1349 if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
1350 return 0;
1351
Jaegeuk Kima1257022015-10-08 10:40:07 -07001352 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
1353 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
1354 available_free_memory(sbi, DIRTY_DENTS))
1355 goto skip_write;
1356
Chao Yud323d002015-10-27 09:53:45 +08001357 /* skip writing during file defragment */
1358 if (is_inode_flag_set(F2FS_I(inode), FI_DO_DEFRAG))
1359 goto skip_write;
1360
Jaegeuk Kimd5669f72015-02-27 13:37:39 -08001361 /* during POR, we don't need to trigger writepage at all. */
1362 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1363 goto skip_write;
1364
Jaegeuk Kim50c8cdb2014-03-18 13:47:11 +09001365 diff = nr_pages_to_write(sbi, DATA, wbc);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001366
Jaegeuk Kim5463e7c2015-04-21 10:40:54 -07001367 if (!S_ISDIR(inode->i_mode)) {
1368 mutex_lock(&sbi->writepages);
1369 locked = true;
1370 }
Chao Yu8f46dca2015-07-14 18:56:10 +08001371 ret = f2fs_write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
Chao Yubb96a8d2015-07-06 20:31:49 +08001372 f2fs_submit_merged_bio(sbi, DATA, WRITE);
Jaegeuk Kim5463e7c2015-04-21 10:40:54 -07001373 if (locked)
1374 mutex_unlock(&sbi->writepages);
Jaegeuk Kim458e6192013-12-11 13:54:01 +09001375
Chao Yuc227f912015-12-16 13:09:20 +08001376 remove_dirty_inode(inode);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001377
Jaegeuk Kim50c8cdb2014-03-18 13:47:11 +09001378 wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001379 return ret;
Jaegeuk Kimd3baf952014-03-18 13:43:05 +09001380
1381skip_write:
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001382 wbc->pages_skipped += get_dirty_pages(inode);
Jaegeuk Kimd3baf952014-03-18 13:43:05 +09001383 return 0;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001384}
1385
Chao Yu3aab8f82014-07-02 13:25:04 +08001386static void f2fs_write_failed(struct address_space *mapping, loff_t to)
1387{
1388 struct inode *inode = mapping->host;
Jaegeuk Kim819d9152015-12-28 13:48:11 -08001389 loff_t i_size = i_size_read(inode);
Chao Yu3aab8f82014-07-02 13:25:04 +08001390
Jaegeuk Kim819d9152015-12-28 13:48:11 -08001391 if (to > i_size) {
1392 truncate_pagecache(inode, i_size);
1393 truncate_blocks(inode, i_size, true);
Chao Yu3aab8f82014-07-02 13:25:04 +08001394 }
1395}
1396
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001397static int prepare_write_begin(struct f2fs_sb_info *sbi,
1398 struct page *page, loff_t pos, unsigned len,
1399 block_t *blk_addr, bool *node_changed)
1400{
1401 struct inode *inode = page->mapping->host;
1402 pgoff_t index = page->index;
1403 struct dnode_of_data dn;
1404 struct page *ipage;
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001405 bool locked = false;
1406 struct extent_info ei;
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001407 int err = 0;
1408
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001409 if (f2fs_has_inline_data(inode) ||
1410 (pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
1411 f2fs_lock_op(sbi);
1412 locked = true;
1413 }
1414restart:
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001415 /* check inline_data */
1416 ipage = get_node_page(sbi, inode->i_ino);
1417 if (IS_ERR(ipage)) {
1418 err = PTR_ERR(ipage);
1419 goto unlock_out;
1420 }
1421
1422 set_new_dnode(&dn, inode, ipage, ipage, 0);
1423
1424 if (f2fs_has_inline_data(inode)) {
1425 if (pos + len <= MAX_INLINE_DATA) {
1426 read_inline_data(page, ipage);
1427 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
1428 sync_inode_page(&dn);
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001429 } else {
1430 err = f2fs_convert_inline_page(&dn, page);
1431 if (err)
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001432 goto out;
1433 if (dn.data_blkaddr == NULL_ADDR)
1434 err = f2fs_get_block(&dn, index);
1435 }
1436 } else if (locked) {
1437 err = f2fs_get_block(&dn, index);
1438 } else {
1439 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
1440 dn.data_blkaddr = ei.blk + index - ei.fofs;
1441 } else {
1442 bool restart = false;
1443
1444 /* hole case */
1445 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
1446 if (err || (!err && dn.data_blkaddr == NULL_ADDR))
1447 restart = true;
1448 if (restart) {
1449 f2fs_put_dnode(&dn);
1450 f2fs_lock_op(sbi);
1451 locked = true;
1452 goto restart;
1453 }
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001454 }
1455 }
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001456
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001457 /* convert_inline_page can make node_changed */
1458 *blk_addr = dn.data_blkaddr;
1459 *node_changed = dn.node_changed;
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001460out:
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001461 f2fs_put_dnode(&dn);
1462unlock_out:
Jaegeuk Kimb4d07a32015-12-23 13:48:58 -08001463 if (locked)
1464 f2fs_unlock_op(sbi);
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001465 return err;
1466}
1467
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001468static int f2fs_write_begin(struct file *file, struct address_space *mapping,
1469 loff_t pos, unsigned len, unsigned flags,
1470 struct page **pagep, void **fsdata)
1471{
1472 struct inode *inode = mapping->host;
Jaegeuk Kim40813632014-09-02 15:31:18 -07001473 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim86531d62015-07-15 13:08:21 -07001474 struct page *page = NULL;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001475 pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001476 bool need_balance = false;
1477 block_t blkaddr = NULL_ADDR;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001478 int err = 0;
1479
Chao Yu62aed042014-05-06 16:46:04 +08001480 trace_f2fs_write_begin(inode, pos, len, flags);
1481
Jaegeuk Kim5f727392014-11-25 10:59:45 -08001482 /*
1483 * We should check this at this moment to avoid deadlock on inode page
1484 * and #0 page. The locking rule for inline_data conversion should be:
1485 * lock_page(page #0) -> lock_page(inode_page)
1486 */
1487 if (index != 0) {
1488 err = f2fs_convert_inline_inode(inode);
1489 if (err)
1490 goto fail;
1491 }
Jaegeuk Kimafcb7ca02013-04-26 11:55:17 +09001492repeat:
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001493 page = grab_cache_page_write_begin(mapping, index, flags);
Chao Yu3aab8f82014-07-02 13:25:04 +08001494 if (!page) {
1495 err = -ENOMEM;
1496 goto fail;
1497 }
Jaegeuk Kimd5f66992014-04-30 09:22:45 +09001498
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001499 *pagep = page;
1500
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001501 err = prepare_write_begin(sbi, page, pos, len,
1502 &blkaddr, &need_balance);
Jaegeuk Kim9ba69cf2014-10-17 20:33:55 -07001503 if (err)
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001504 goto fail;
Jaegeuk Kim9ba69cf2014-10-17 20:33:55 -07001505
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001506 if (need_balance && has_not_enough_free_secs(sbi, 0)) {
Jaegeuk Kim2a340762015-12-22 13:23:35 -08001507 unlock_page(page);
Jaegeuk Kim2c4db1a2016-01-07 14:15:04 -08001508 f2fs_balance_fs(sbi, true);
Jaegeuk Kim2a340762015-12-22 13:23:35 -08001509 lock_page(page);
1510 if (page->mapping != mapping) {
1511 /* The page got truncated from under us */
1512 f2fs_put_page(page, 1);
1513 goto repeat;
1514 }
1515 }
1516
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001517 f2fs_wait_on_page_writeback(page, DATA);
1518
Chao Yu08b39fb2015-10-08 13:27:34 +08001519 /* wait for GCed encrypted page writeback */
1520 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001521 f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
Chao Yu08b39fb2015-10-08 13:27:34 +08001522
Chao Yu90d43882015-07-08 18:24:38 +08001523 if (len == PAGE_CACHE_SIZE)
1524 goto out_update;
1525 if (PageUptodate(page))
1526 goto out_clear;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001527
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001528 if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
1529 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
1530 unsigned end = start + len;
1531
1532 /* Reading beyond i_size is simple: memset to zero */
1533 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
Chao Yu90d43882015-07-08 18:24:38 +08001534 goto out_update;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001535 }
1536
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001537 if (blkaddr == NEW_ADDR) {
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001538 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1539 } else {
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -08001540 struct f2fs_io_info fio = {
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001541 .sbi = sbi,
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -08001542 .type = DATA,
1543 .rw = READ_SYNC,
Jaegeuk Kim2aadac02015-12-23 11:55:18 -08001544 .blk_addr = blkaddr,
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001545 .page = page,
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001546 .encrypted_page = NULL,
Jaegeuk Kimcf04e8e2014-12-17 19:33:13 -08001547 };
Jaegeuk Kim05ca3632015-04-23 14:38:15 -07001548 err = f2fs_submit_page_bio(&fio);
Jan Kara9234f312014-10-22 15:21:47 +02001549 if (err)
1550 goto fail;
Chao Yud54c7952014-03-29 15:30:40 +08001551
Jaegeuk Kim393ff912013-03-08 21:29:23 +09001552 lock_page(page);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +09001553 if (unlikely(!PageUptodate(page))) {
Chao Yu3aab8f82014-07-02 13:25:04 +08001554 err = -EIO;
1555 goto fail;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001556 }
Jaegeuk Kim6bacf522013-12-06 15:00:58 +09001557 if (unlikely(page->mapping != mapping)) {
Jaegeuk Kimafcb7ca02013-04-26 11:55:17 +09001558 f2fs_put_page(page, 1);
1559 goto repeat;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001560 }
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001561
1562 /* avoid symlink page */
1563 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) {
1564 err = f2fs_decrypt_one(inode, page);
Jaegeuk Kim86531d62015-07-15 13:08:21 -07001565 if (err)
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001566 goto fail;
Jaegeuk Kim4375a332015-04-23 12:04:33 -07001567 }
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001568 }
Chao Yu90d43882015-07-08 18:24:38 +08001569out_update:
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001570 SetPageUptodate(page);
Chao Yu90d43882015-07-08 18:24:38 +08001571out_clear:
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001572 clear_cold_data(page);
1573 return 0;
Jaegeuk Kim9ba69cf2014-10-17 20:33:55 -07001574
Chao Yu3aab8f82014-07-02 13:25:04 +08001575fail:
Jaegeuk Kim86531d62015-07-15 13:08:21 -07001576 f2fs_put_page(page, 1);
Chao Yu3aab8f82014-07-02 13:25:04 +08001577 f2fs_write_failed(mapping, pos + len);
1578 return err;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001579}
1580
Jaegeuk Kima1dd3c12013-06-27 13:04:08 +09001581static int f2fs_write_end(struct file *file,
1582 struct address_space *mapping,
1583 loff_t pos, unsigned len, unsigned copied,
1584 struct page *page, void *fsdata)
1585{
1586 struct inode *inode = page->mapping->host;
1587
Chao Yudfb2bf32014-05-06 16:47:23 +08001588 trace_f2fs_write_end(inode, pos, len, copied);
1589
Jaegeuk Kim34ba94b2014-10-09 13:19:53 -07001590 set_page_dirty(page);
Jaegeuk Kima1dd3c12013-06-27 13:04:08 +09001591
1592 if (pos + copied > i_size_read(inode)) {
1593 i_size_write(inode, pos + copied);
1594 mark_inode_dirty(inode);
1595 update_inode_page(inode);
1596 }
1597
Chao Yu75c3c8b2013-11-16 14:15:59 +08001598 f2fs_put_page(page, 1);
Jaegeuk Kimd0239e12016-01-08 16:57:48 -08001599 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
Jaegeuk Kima1dd3c12013-06-27 13:04:08 +09001600 return copied;
1601}
1602
Omar Sandoval6f673762015-03-16 04:33:52 -07001603static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
1604 loff_t offset)
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001605{
1606 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001607
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001608 if (offset & blocksize_mask)
1609 return -EINVAL;
1610
Al Viro5b46f252014-03-16 18:07:34 -04001611 if (iov_iter_alignment(iter) & blocksize_mask)
1612 return -EINVAL;
1613
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001614 return 0;
1615}
1616
Omar Sandoval22c61862015-03-16 04:33:53 -07001617static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
1618 loff_t offset)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001619{
1620 struct file *file = iocb->ki_filp;
Chao Yu3aab8f82014-07-02 13:25:04 +08001621 struct address_space *mapping = file->f_mapping;
1622 struct inode *inode = mapping->host;
1623 size_t count = iov_iter_count(iter);
1624 int err;
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001625
Jaegeuk Kimb3d208f2014-10-23 19:48:09 -07001626 /* we don't need to use inline_data strictly */
Jaegeuk Kimb9d777b2015-12-22 11:09:35 -08001627 err = f2fs_convert_inline_inode(inode);
1628 if (err)
1629 return err;
Huajun Li9ffe0fb2013-11-10 23:13:20 +08001630
Jaegeuk Kimfcc85a42015-04-21 20:39:58 -07001631 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
1632 return 0;
1633
Chao Yuc15e8592015-08-07 18:39:32 +08001634 err = check_direct_IO(inode, iter, offset);
1635 if (err)
1636 return err;
Jaegeuk Kim944fcfc2013-12-26 20:15:09 +09001637
Omar Sandoval6f673762015-03-16 04:33:52 -07001638 trace_f2fs_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));
Chao Yu70407fa2014-07-31 21:11:22 +08001639
Chao Yuf9811702015-09-21 20:17:52 +08001640 if (iov_iter_rw(iter) == WRITE) {
Chao Yu6d5a1492015-12-24 18:04:56 +08001641 err = __allocate_data_blocks(inode, offset, count);
1642 if (err)
Chao Yuf9811702015-09-21 20:17:52 +08001643 goto out;
Chao Yuf9811702015-09-21 20:17:52 +08001644 }
Jaegeuk Kim59b802e2015-02-09 12:09:53 -08001645
Chao Yue2b4e2b2015-08-19 19:11:19 +08001646 err = blockdev_direct_IO(iocb, inode, iter, offset, get_data_block_dio);
Chao Yuf9811702015-09-21 20:17:52 +08001647out:
Omar Sandoval6f673762015-03-16 04:33:52 -07001648 if (err < 0 && iov_iter_rw(iter) == WRITE)
Chao Yu3aab8f82014-07-02 13:25:04 +08001649 f2fs_write_failed(mapping, offset + count);
Chao Yu70407fa2014-07-31 21:11:22 +08001650
Omar Sandoval6f673762015-03-16 04:33:52 -07001651 trace_f2fs_direct_IO_exit(inode, offset, count, iov_iter_rw(iter), err);
Chao Yu70407fa2014-07-31 21:11:22 +08001652
Chao Yu3aab8f82014-07-02 13:25:04 +08001653 return err;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001654}
1655
Chao Yu487261f2015-02-05 17:44:29 +08001656void f2fs_invalidate_page(struct page *page, unsigned int offset,
1657 unsigned int length)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001658{
1659 struct inode *inode = page->mapping->host;
Chao Yu487261f2015-02-05 17:44:29 +08001660 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001661
Chao Yu487261f2015-02-05 17:44:29 +08001662 if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
1663 (offset % PAGE_CACHE_SIZE || length != PAGE_CACHE_SIZE))
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001664 return;
1665
Chao Yu487261f2015-02-05 17:44:29 +08001666 if (PageDirty(page)) {
1667 if (inode->i_ino == F2FS_META_INO(sbi))
1668 dec_page_count(sbi, F2FS_DIRTY_META);
1669 else if (inode->i_ino == F2FS_NODE_INO(sbi))
1670 dec_page_count(sbi, F2FS_DIRTY_NODES);
1671 else
1672 inode_dec_dirty_pages(inode);
1673 }
Chao Yudecd36b2015-08-07 18:42:09 +08001674
1675 /* This is atomic written page, keep Private */
1676 if (IS_ATOMIC_WRITTEN_PAGE(page))
1677 return;
1678
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001679 ClearPagePrivate(page);
1680}
1681
Chao Yu487261f2015-02-05 17:44:29 +08001682int f2fs_release_page(struct page *page, gfp_t wait)
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001683{
Jaegeuk Kimf68daee2015-01-30 11:39:08 -08001684 /* If this is dirty page, keep PagePrivate */
1685 if (PageDirty(page))
1686 return 0;
1687
Chao Yudecd36b2015-08-07 18:42:09 +08001688 /* This is atomic written page, keep Private */
1689 if (IS_ATOMIC_WRITTEN_PAGE(page))
1690 return 0;
1691
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001692 ClearPagePrivate(page);
Jaegeuk Kimc3850aa2013-03-14 09:24:32 +09001693 return 1;
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001694}
1695
1696static int f2fs_set_data_page_dirty(struct page *page)
1697{
1698 struct address_space *mapping = page->mapping;
1699 struct inode *inode = mapping->host;
1700
Jaegeuk Kim26c6b882013-10-24 17:53:29 +09001701 trace_f2fs_set_page_dirty(page, DATA);
1702
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001703 SetPageUptodate(page);
Jaegeuk Kim34ba94b2014-10-09 13:19:53 -07001704
Jaegeuk Kim1e843712014-12-09 06:08:59 -08001705 if (f2fs_is_atomic_file(inode)) {
Chao Yudecd36b2015-08-07 18:42:09 +08001706 if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
1707 register_inmem_page(inode, page);
1708 return 1;
1709 }
1710 /*
1711 * Previously, this page has been registered, we just
1712 * return here.
1713 */
1714 return 0;
Jaegeuk Kim34ba94b2014-10-09 13:19:53 -07001715 }
1716
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001717 if (!PageDirty(page)) {
1718 __set_page_dirty_nobuffers(page);
Jaegeuk Kima7ffdbe2014-09-12 15:53:45 -07001719 update_dirty_page(inode, page);
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001720 return 1;
1721 }
1722 return 0;
1723}
1724
Jaegeuk Kimc01e54b2013-01-17 20:30:23 +09001725static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
1726{
Chao Yu454ae7e2014-04-22 13:34:01 +08001727 struct inode *inode = mapping->host;
1728
Jaegeuk Kim1d373a02015-10-19 10:29:51 -07001729 if (f2fs_has_inline_data(inode))
1730 return 0;
1731
1732 /* make sure allocating whole blocks */
1733 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
1734 filemap_write_and_wait(mapping);
1735
Chao Yue2b4e2b2015-08-19 19:11:19 +08001736 return generic_block_bmap(mapping, block, get_data_block_bmap);
Chao Yu429511c2015-02-05 17:54:31 +08001737}
1738
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001739const struct address_space_operations f2fs_dblock_aops = {
1740 .readpage = f2fs_read_data_page,
1741 .readpages = f2fs_read_data_pages,
1742 .writepage = f2fs_write_data_page,
1743 .writepages = f2fs_write_data_pages,
1744 .write_begin = f2fs_write_begin,
Jaegeuk Kima1dd3c12013-06-27 13:04:08 +09001745 .write_end = f2fs_write_end,
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001746 .set_page_dirty = f2fs_set_data_page_dirty,
Chao Yu487261f2015-02-05 17:44:29 +08001747 .invalidatepage = f2fs_invalidate_page,
1748 .releasepage = f2fs_release_page,
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001749 .direct_IO = f2fs_direct_IO,
Jaegeuk Kimc01e54b2013-01-17 20:30:23 +09001750 .bmap = f2fs_bmap,
Jaegeuk Kimeb47b802012-11-02 17:10:12 +09001751};