blob: c7f4fef9ebf5fa8b1215fc065dbdc68ab84dd039 [file] [log] [blame]
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -07001/*
2 * inode.c - NILFS inode operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
Ryusuke Konishi4b420ab2016-05-23 16:23:09 -070016 * Written by Ryusuke Konishi.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070017 *
18 */
19
20#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/gfp.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070022#include <linux/mpage.h>
Andreas Rohner56d7acc2014-09-25 16:05:14 -070023#include <linux/pagemap.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070024#include <linux/writeback.h>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080025#include <linux/uio.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070026#include "nilfs.h"
Al Viro6fd1e5c2010-06-07 11:55:00 -040027#include "btnode.h"
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070028#include "segment.h"
29#include "page.h"
30#include "mdt.h"
31#include "cpfile.h"
32#include "ifile.h"
33
Vyacheslav Dubeykof5974c82012-07-30 14:42:10 -070034/**
35 * struct nilfs_iget_args - arguments used during comparison between inodes
36 * @ino: inode number
37 * @cno: checkpoint number
38 * @root: pointer on NILFS root object (mounted checkpoint)
39 * @for_gc: inode for GC flag
40 */
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090041struct nilfs_iget_args {
42 u64 ino;
43 __u64 cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +090044 struct nilfs_root *root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090045 int for_gc;
46};
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070047
Ryusuke Konishi705304a2014-12-10 15:54:34 -080048static int nilfs_iget_test(struct inode *inode, void *opaque);
49
Ryusuke Konishibe667372011-03-05 00:19:32 +090050void nilfs_inode_add_blocks(struct inode *inode, int n)
51{
52 struct nilfs_root *root = NILFS_I(inode)->i_root;
53
54 inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
55 if (root)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -070056 atomic64_add(n, &root->blocks_count);
Ryusuke Konishibe667372011-03-05 00:19:32 +090057}
58
59void nilfs_inode_sub_blocks(struct inode *inode, int n)
60{
61 struct nilfs_root *root = NILFS_I(inode)->i_root;
62
63 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
64 if (root)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -070065 atomic64_sub(n, &root->blocks_count);
Ryusuke Konishibe667372011-03-05 00:19:32 +090066}
67
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070068/**
69 * nilfs_get_block() - get a file block on the filesystem (callback function)
70 * @inode - inode struct of the target file
71 * @blkoff - file block number
72 * @bh_result - buffer head to be mapped on
73 * @create - indicate whether allocating the block or not when it has not
74 * been allocated yet.
75 *
76 * This function does not issue actual read request of the specified data
77 * block. It is done by VFS.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070078 */
79int nilfs_get_block(struct inode *inode, sector_t blkoff,
80 struct buffer_head *bh_result, int create)
81{
82 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090083 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090084 __u64 blknum = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070085 int err = 0, ret;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -070086 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070087
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090088 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090089 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090090 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090091 if (ret >= 0) { /* found */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070092 map_bh(bh_result, inode->i_sb, blknum);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090093 if (ret > 0)
94 bh_result->b_size = (ret << inode->i_blkbits);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070095 goto out;
96 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070097 /* data block was not found */
98 if (ret == -ENOENT && create) {
99 struct nilfs_transaction_info ti;
100
101 bh_result->b_blocknr = 0;
102 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
103 if (unlikely(err))
104 goto out;
Ryusuke Konishi3568a132015-04-16 12:46:34 -0700105 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700106 (unsigned long)bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700107 if (unlikely(err != 0)) {
108 if (err == -EEXIST) {
109 /*
110 * The get_block() function could be called
111 * from multiple callers for an inode.
112 * However, the page having this block must
113 * be locked in this case.
114 */
Ryusuke Konishifeee8802016-08-02 14:05:10 -0700115 nilfs_msg(inode->i_sb, KERN_WARNING,
116 "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
117 __func__, inode->i_ino,
118 (unsigned long long)blkoff);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700119 err = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700120 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700121 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700122 goto out;
123 }
Andreas Rohnerb9f66142014-10-13 15:53:22 -0700124 nilfs_mark_inode_dirty_sync(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700125 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700126 /* Error handling should be detailed */
127 set_buffer_new(bh_result);
Ryusuke Konishi27e6c7a2010-12-26 16:28:28 +0900128 set_buffer_delay(bh_result);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700129 map_bh(bh_result, inode->i_sb, 0);
130 /* Disk block number must be changed to proper value */
131
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700132 } else if (ret == -ENOENT) {
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700133 /*
134 * not found is not error (e.g. hole); must return without
135 * the mapped state flag.
136 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700137 ;
138 } else {
139 err = ret;
140 }
141
142 out:
143 return err;
144}
145
146/**
147 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
148 * address_space_operations.
149 * @file - file struct of the file to be read
150 * @page - the page to be read
151 */
152static int nilfs_readpage(struct file *file, struct page *page)
153{
154 return mpage_readpage(page, nilfs_get_block);
155}
156
157/**
158 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
159 * address_space_operations.
160 * @file - file struct of the file to be read
161 * @mapping - address_space struct used for reading multiple pages
162 * @pages - the pages to be read
163 * @nr_pages - number of pages to be read
164 */
165static int nilfs_readpages(struct file *file, struct address_space *mapping,
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700166 struct list_head *pages, unsigned int nr_pages)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700167{
168 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
169}
170
171static int nilfs_writepages(struct address_space *mapping,
172 struct writeback_control *wbc)
173{
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700174 struct inode *inode = mapping->host;
175 int err = 0;
176
Vyacheslav Dubeyko8c26c4e2013-04-30 15:27:48 -0700177 if (inode->i_sb->s_flags & MS_RDONLY) {
178 nilfs_clear_dirty_pages(mapping, false);
179 return -EROFS;
180 }
181
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700182 if (wbc->sync_mode == WB_SYNC_ALL)
183 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
184 wbc->range_start,
185 wbc->range_end);
186 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700187}
188
189static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
190{
191 struct inode *inode = page->mapping->host;
192 int err;
193
Vyacheslav Dubeykoeb53b6d2013-04-30 15:27:51 -0700194 if (inode->i_sb->s_flags & MS_RDONLY) {
Vyacheslav Dubeyko8c26c4e2013-04-30 15:27:48 -0700195 /*
196 * It means that filesystem was remounted in read-only
197 * mode because of error or metadata corruption. But we
198 * have dirty pages that try to be flushed in background.
199 * So, here we simply discard this dirty page.
200 */
201 nilfs_clear_dirty_page(page, false);
202 unlock_page(page);
203 return -EROFS;
204 }
205
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700206 redirty_page_for_writepage(wbc, page);
207 unlock_page(page);
208
209 if (wbc->sync_mode == WB_SYNC_ALL) {
210 err = nilfs_construct_segment(inode->i_sb);
211 if (unlikely(err))
212 return err;
213 } else if (wbc->for_reclaim)
214 nilfs_flush_segment(inode->i_sb, inode->i_ino);
215
216 return 0;
217}
218
219static int nilfs_set_page_dirty(struct page *page)
220{
Andreas Rohner56d7acc2014-09-25 16:05:14 -0700221 struct inode *inode = page->mapping->host;
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700222 int ret = __set_page_dirty_nobuffers(page);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700223
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700224 if (page_has_buffers(page)) {
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700225 unsigned int nr_dirty = 0;
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700226 struct buffer_head *bh, *head;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700227
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700228 /*
229 * This page is locked by callers, and no other thread
230 * concurrently marks its buffers dirty since they are
231 * only dirtied through routines in fs/buffer.c in
232 * which call sites of mark_buffer_dirty are protected
233 * by page lock.
234 */
235 bh = head = page_buffers(page);
236 do {
237 /* Do not mark hole blocks dirty */
238 if (buffer_dirty(bh) || !buffer_mapped(bh))
239 continue;
240
241 set_buffer_dirty(bh);
242 nr_dirty++;
243 } while (bh = bh->b_this_page, bh != head);
244
245 if (nr_dirty)
246 nilfs_set_file_dirty(inode, nr_dirty);
Andreas Rohner56d7acc2014-09-25 16:05:14 -0700247 } else if (ret) {
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700248 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
Andreas Rohner56d7acc2014-09-25 16:05:14 -0700249
250 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700251 }
252 return ret;
253}
254
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100255void nilfs_write_failed(struct address_space *mapping, loff_t to)
256{
257 struct inode *inode = mapping->host;
258
259 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700260 truncate_pagecache(inode, inode->i_size);
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100261 nilfs_truncate(inode);
262 }
263}
264
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700265static int nilfs_write_begin(struct file *file, struct address_space *mapping,
266 loff_t pos, unsigned len, unsigned flags,
267 struct page **pagep, void **fsdata)
268
269{
270 struct inode *inode = mapping->host;
271 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
272
273 if (unlikely(err))
274 return err;
275
Christoph Hellwig155130a2010-06-04 11:29:58 +0200276 err = block_write_begin(mapping, pos, len, flags, pagep,
277 nilfs_get_block);
278 if (unlikely(err)) {
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100279 nilfs_write_failed(mapping, pos + len);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700280 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200281 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700282 return err;
283}
284
285static int nilfs_write_end(struct file *file, struct address_space *mapping,
286 loff_t pos, unsigned len, unsigned copied,
287 struct page *page, void *fsdata)
288{
289 struct inode *inode = mapping->host;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700290 unsigned int start = pos & (PAGE_SIZE - 1);
291 unsigned int nr_dirty;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700292 int err;
293
294 nr_dirty = nilfs_page_count_clean_buffers(page, start,
295 start + copied);
296 copied = generic_write_end(file, mapping, pos, len, copied, page,
297 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900298 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700299 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700300 return err ? : copied;
301}
302
303static ssize_t
Christoph Hellwigc8b8e322016-04-07 08:51:58 -0700304nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700305{
Al Viro6b6dabc2015-06-21 01:37:24 -0400306 struct inode *inode = file_inode(iocb->ki_filp);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700307
Omar Sandoval6f673762015-03-16 04:33:52 -0700308 if (iov_iter_rw(iter) == WRITE)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700309 return 0;
310
311 /* Needs synchronization with the cleaner */
Christoph Hellwigc8b8e322016-04-07 08:51:58 -0700312 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700313}
314
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700315const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700316 .writepage = nilfs_writepage,
317 .readpage = nilfs_readpage,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700318 .writepages = nilfs_writepages,
319 .set_page_dirty = nilfs_set_page_dirty,
320 .readpages = nilfs_readpages,
321 .write_begin = nilfs_write_begin,
322 .write_end = nilfs_write_end,
323 /* .releasepage = nilfs_releasepage, */
324 .invalidatepage = block_invalidatepage,
325 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900326 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700327};
328
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800329static int nilfs_insert_inode_locked(struct inode *inode,
330 struct nilfs_root *root,
331 unsigned long ino)
332{
333 struct nilfs_iget_args args = {
334 .ino = ino, .root = root, .cno = 0, .for_gc = 0
335 };
336
337 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
338}
339
Al Viroc6e49e32011-07-26 03:07:14 -0400340struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700341{
342 struct super_block *sb = dir->i_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900343 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700344 struct inode *inode;
345 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900346 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700347 int err = -ENOMEM;
348 ino_t ino;
349
350 inode = new_inode(sb);
351 if (unlikely(!inode))
352 goto failed;
353
354 mapping_set_gfp_mask(inode->i_mapping,
Michal Hockoc62d2552015-11-06 16:28:49 -0800355 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700356
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900357 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700358 ii = NILFS_I(inode);
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -0700359 ii->i_state = BIT(NILFS_I_NEW);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900360 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700361
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900362 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700363 if (unlikely(err))
364 goto failed_ifile_create_inode;
365 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
366
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700367 atomic64_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300368 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700369 inode->i_ino = ino;
Deepa Dinamani078cd822016-09-14 07:48:04 -0700370 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700371
372 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
373 err = nilfs_bmap_read(ii->i_bmap, NULL);
374 if (err < 0)
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800375 goto failed_after_creation;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700376
377 set_bit(NILFS_I_BMAP, &ii->i_state);
378 /* No lock is needed; iget() ensures it. */
379 }
380
Ryusuke Konishib253a3e2011-01-20 02:09:53 +0900381 ii->i_flags = nilfs_mask_flags(
382 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700383
384 /* ii->i_file_acl = 0; */
385 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700386 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700387 nilfs_set_inode_flags(inode);
Ryusuke Konishi9b1fc4e42011-03-09 11:05:08 +0900388 spin_lock(&nilfs->ns_next_gen_lock);
389 inode->i_generation = nilfs->ns_next_generation++;
390 spin_unlock(&nilfs->ns_next_gen_lock);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800391 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
392 err = -EIO;
393 goto failed_after_creation;
394 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700395
396 err = nilfs_init_acl(inode, dir);
397 if (unlikely(err))
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700398 /*
399 * Never occur. When supporting nilfs_init_acl(),
400 * proper cancellation of above jobs should be considered.
401 */
402 goto failed_after_creation;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700403
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700404 return inode;
405
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800406 failed_after_creation:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200407 clear_nlink(inode);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800408 unlock_new_inode(inode);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700409 iput(inode); /*
410 * raw_inode will be deleted through
411 * nilfs_evict_inode().
412 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700413 goto failed;
414
415 failed_ifile_create_inode:
416 make_bad_inode(inode);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700417 iput(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700418 failed:
419 return ERR_PTR(err);
420}
421
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700422void nilfs_set_inode_flags(struct inode *inode)
423{
424 unsigned int flags = NILFS_I(inode)->i_flags;
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700425 unsigned int new_fl = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700426
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900427 if (flags & FS_SYNC_FL)
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700428 new_fl |= S_SYNC;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900429 if (flags & FS_APPEND_FL)
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700430 new_fl |= S_APPEND;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900431 if (flags & FS_IMMUTABLE_FL)
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700432 new_fl |= S_IMMUTABLE;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900433 if (flags & FS_NOATIME_FL)
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700434 new_fl |= S_NOATIME;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900435 if (flags & FS_DIRSYNC_FL)
Ryusuke Konishifaea2c52015-04-16 12:46:50 -0700436 new_fl |= S_DIRSYNC;
437 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
438 S_NOATIME | S_DIRSYNC);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700439}
440
441int nilfs_read_inode_common(struct inode *inode,
442 struct nilfs_inode *raw_inode)
443{
444 struct nilfs_inode_info *ii = NILFS_I(inode);
445 int err;
446
447 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
Eric W. Biederman305d3d02012-02-10 12:31:23 -0800448 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
449 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +0200450 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700451 inode->i_size = le64_to_cpu(raw_inode->i_size);
452 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
453 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
454 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700455 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
456 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
457 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
Ryusuke Konishi705304a2014-12-10 15:54:34 -0800458 if (inode->i_nlink == 0)
459 return -ESTALE; /* this inode is deleted */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700460
461 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
462 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
463#if 0
464 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
465 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
466 0 : le32_to_cpu(raw_inode->i_dir_acl);
467#endif
Ryusuke Konishi3cc811b2009-09-28 13:02:46 +0900468 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700469 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
470
471 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
472 S_ISLNK(inode->i_mode)) {
473 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
474 if (err < 0)
475 return err;
476 set_bit(NILFS_I_BMAP, &ii->i_state);
477 /* No lock is needed; iget() ensures it. */
478 }
479 return 0;
480}
481
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900482static int __nilfs_read_inode(struct super_block *sb,
483 struct nilfs_root *root, unsigned long ino,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700484 struct inode *inode)
485{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900486 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700487 struct buffer_head *bh;
488 struct nilfs_inode *raw_inode;
489 int err;
490
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900491 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900492 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700493 if (unlikely(err))
494 goto bad_inode;
495
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900496 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700497
Ryusuke Konishi1b2f5a62009-08-22 19:10:07 +0900498 err = nilfs_read_inode_common(inode, raw_inode);
499 if (err)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700500 goto failed_unmap;
501
502 if (S_ISREG(inode->i_mode)) {
503 inode->i_op = &nilfs_file_inode_operations;
504 inode->i_fop = &nilfs_file_operations;
505 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700506 } else if (S_ISDIR(inode->i_mode)) {
507 inode->i_op = &nilfs_dir_inode_operations;
508 inode->i_fop = &nilfs_dir_operations;
509 inode->i_mapping->a_ops = &nilfs_aops;
510 } else if (S_ISLNK(inode->i_mode)) {
511 inode->i_op = &nilfs_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500512 inode_nohighmem(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700513 inode->i_mapping->a_ops = &nilfs_aops;
514 } else {
515 inode->i_op = &nilfs_special_inode_operations;
516 init_special_inode(
517 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900518 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700519 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900520 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700521 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900522 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700523 nilfs_set_inode_flags(inode);
Ryusuke Konishi0ce187c2015-04-16 12:46:47 -0700524 mapping_set_gfp_mask(inode->i_mapping,
Michal Hockoc62d2552015-11-06 16:28:49 -0800525 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700526 return 0;
527
528 failed_unmap:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900529 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700530 brelse(bh);
531
532 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900533 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700534 return err;
535}
536
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900537static int nilfs_iget_test(struct inode *inode, void *opaque)
538{
539 struct nilfs_iget_args *args = opaque;
540 struct nilfs_inode_info *ii;
541
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900542 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900543 return 0;
544
545 ii = NILFS_I(inode);
546 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
547 return !args->for_gc;
548
549 return args->for_gc && args->cno == ii->i_cno;
550}
551
552static int nilfs_iget_set(struct inode *inode, void *opaque)
553{
554 struct nilfs_iget_args *args = opaque;
555
556 inode->i_ino = args->ino;
557 if (args->for_gc) {
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -0700558 NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900559 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900560 NILFS_I(inode)->i_root = NULL;
561 } else {
562 if (args->root && args->ino == NILFS_ROOT_INO)
563 nilfs_get_root(args->root);
564 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900565 }
566 return 0;
567}
568
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900569struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
570 unsigned long ino)
571{
572 struct nilfs_iget_args args = {
573 .ino = ino, .root = root, .cno = 0, .for_gc = 0
574 };
575
576 return ilookup5(sb, ino, nilfs_iget_test, &args);
577}
578
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900579struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
580 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700581{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900582 struct nilfs_iget_args args = {
583 .ino = ino, .root = root, .cno = 0, .for_gc = 0
584 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900585
586 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
587}
588
589struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
590 unsigned long ino)
591{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700592 struct inode *inode;
593 int err;
594
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900595 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700596 if (unlikely(!inode))
597 return ERR_PTR(-ENOMEM);
598 if (!(inode->i_state & I_NEW))
599 return inode;
600
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900601 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700602 if (unlikely(err)) {
603 iget_failed(inode);
604 return ERR_PTR(err);
605 }
606 unlock_new_inode(inode);
607 return inode;
608}
609
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900610struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
611 __u64 cno)
612{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900613 struct nilfs_iget_args args = {
614 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
615 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900616 struct inode *inode;
617 int err;
618
619 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
620 if (unlikely(!inode))
621 return ERR_PTR(-ENOMEM);
622 if (!(inode->i_state & I_NEW))
623 return inode;
624
625 err = nilfs_init_gcinode(inode);
626 if (unlikely(err)) {
627 iget_failed(inode);
628 return ERR_PTR(err);
629 }
630 unlock_new_inode(inode);
631 return inode;
632}
633
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700634void nilfs_write_inode_common(struct inode *inode,
635 struct nilfs_inode *raw_inode, int has_bmap)
636{
637 struct nilfs_inode_info *ii = NILFS_I(inode);
638
639 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
Eric W. Biederman305d3d02012-02-10 12:31:23 -0800640 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
641 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700642 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
643 raw_inode->i_size = cpu_to_le64(inode->i_size);
644 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
645 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700646 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
647 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700648 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
649
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700650 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
651 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
652
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900653 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
654 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
655
656 /* zero-fill unused portion in the case of super root block */
657 raw_inode->i_xattr = 0;
658 raw_inode->i_pad = 0;
659 memset((void *)raw_inode + sizeof(*raw_inode), 0,
660 nilfs->ns_inode_size - sizeof(*raw_inode));
661 }
662
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700663 if (has_bmap)
664 nilfs_bmap_write(ii->i_bmap, raw_inode);
665 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
666 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900667 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700668 /*
669 * When extending inode, nilfs->ns_inode_size should be checked
670 * for substitutions of appended fields.
671 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700672}
673
Andreas Rohnerb9f66142014-10-13 15:53:22 -0700674void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700675{
676 ino_t ino = inode->i_ino;
677 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900678 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700679 struct nilfs_inode *raw_inode;
680
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900681 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700682
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700683 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900684 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Andreas Rohnerb9f66142014-10-13 15:53:22 -0700685 if (flags & I_DIRTY_DATASYNC)
686 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700687
688 nilfs_write_inode_common(inode, raw_inode, 0);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700689 /*
690 * XXX: call with has_bmap = 0 is a workaround to avoid
691 * deadlock of bmap. This delays update of i_bmap to just
692 * before writing.
693 */
694
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900695 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700696}
697
698#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
699
700static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
701 unsigned long from)
702{
Ryusuke Konishi3568a132015-04-16 12:46:34 -0700703 __u64 b;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700704 int ret;
705
706 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
707 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900708repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700709 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
710 if (ret == -ENOENT)
711 return;
712 else if (ret < 0)
713 goto failed;
714
715 if (b < from)
716 return;
717
Ryusuke Konishi3568a132015-04-16 12:46:34 -0700718 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700719 ret = nilfs_bmap_truncate(ii->i_bmap, b);
720 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
721 if (!ret || (ret == -ENOMEM &&
722 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
723 goto repeat;
724
Ryusuke Konishie8289492010-11-19 15:26:20 +0900725failed:
Ryusuke Konishid6517de2016-08-02 14:05:14 -0700726 nilfs_msg(ii->vfs_inode.i_sb, KERN_WARNING,
727 "error %d truncating bmap (ino=%lu)", ret,
728 ii->vfs_inode.i_ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700729}
730
731void nilfs_truncate(struct inode *inode)
732{
733 unsigned long blkoff;
734 unsigned int blocksize;
735 struct nilfs_transaction_info ti;
736 struct super_block *sb = inode->i_sb;
737 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700738
739 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
740 return;
741 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
742 return;
743
744 blocksize = sb->s_blocksize;
745 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700746 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700747
748 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
749
750 nilfs_truncate_bmap(ii, blkoff);
751
Deepa Dinamani078cd822016-09-14 07:48:04 -0700752 inode->i_mtime = inode->i_ctime = current_time(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700753 if (IS_SYNC(inode))
754 nilfs_set_transaction_flag(NILFS_TI_SYNC);
755
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900756 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900757 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700758 nilfs_transaction_commit(sb);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700759 /*
760 * May construct a logical segment and may fail in sync mode.
761 * But truncate has no return value.
762 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700763}
764
Al Viro6fd1e5c2010-06-07 11:55:00 -0400765static void nilfs_clear_inode(struct inode *inode)
766{
767 struct nilfs_inode_info *ii = NILFS_I(inode);
768
769 /*
770 * Free resources allocated in nilfs_read_inode(), here.
771 */
772 BUG_ON(!list_empty(&ii->i_dirty));
773 brelse(ii->i_bh);
774 ii->i_bh = NULL;
775
Ryusuke Konishi2d199612016-05-23 16:23:20 -0700776 if (nilfs_is_metadata_file_inode(inode))
777 nilfs_mdt_clear(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900778
Al Viro6fd1e5c2010-06-07 11:55:00 -0400779 if (test_bit(NILFS_I_BMAP, &ii->i_state))
780 nilfs_bmap_clear(ii->i_bmap);
781
782 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900783
784 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
785 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400786}
787
788void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700789{
790 struct nilfs_transaction_info ti;
791 struct super_block *sb = inode->i_sb;
792 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900793 int ret;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700794
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900795 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700796 truncate_inode_pages_final(&inode->i_data);
Jan Karadbd57682012-05-03 14:48:02 +0200797 clear_inode(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400798 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700799 return;
800 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700801 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
802
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700803 truncate_inode_pages_final(&inode->i_data);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700804
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900805 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700806 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900807 nilfs_mark_inode_dirty(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200808 clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900809
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900810 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
811 if (!ret)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700812 atomic64_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900813
Al Viro6fd1e5c2010-06-07 11:55:00 -0400814 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900815
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700816 if (IS_SYNC(inode))
817 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700818 nilfs_transaction_commit(sb);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700819 /*
820 * May construct a logical segment and may fail in sync mode.
821 * But delete_inode has no return value.
822 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700823}
824
825int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
826{
827 struct nilfs_transaction_info ti;
David Howells2b0143b2015-03-17 22:25:59 +0000828 struct inode *inode = d_inode(dentry);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700829 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700830 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700831
Jan Kara31051c82016-05-26 16:55:18 +0200832 err = setattr_prepare(dentry, iattr);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700833 if (err)
834 return err;
835
836 err = nilfs_transaction_begin(sb, &ti, 0);
837 if (unlikely(err))
838 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700839
Christoph Hellwig10257742010-06-04 11:30:02 +0200840 if ((iattr->ia_valid & ATTR_SIZE) &&
841 iattr->ia_size != i_size_read(inode)) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400842 inode_dio_wait(inode);
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100843 truncate_setsize(inode, iattr->ia_size);
844 nilfs_truncate(inode);
Christoph Hellwig10257742010-06-04 11:30:02 +0200845 }
846
847 setattr_copy(inode, iattr);
848 mark_inode_dirty(inode);
849
850 if (iattr->ia_valid & ATTR_MODE) {
851 err = nilfs_acl_chmod(inode);
852 if (unlikely(err))
853 goto out_err;
854 }
855
856 return nilfs_transaction_commit(sb);
857
858out_err:
859 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700860 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700861}
862
Al Viro10556cb2011-06-20 19:28:19 -0400863int nilfs_permission(struct inode *inode, int mask)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900864{
Al Viro730e9082011-06-18 20:21:44 -0400865 struct nilfs_root *root = NILFS_I(inode)->i_root;
Ryusuke Konishi4ad364c2016-05-23 16:23:25 -0700866
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900867 if ((mask & MAY_WRITE) && root &&
868 root->cno != NILFS_CPTREE_CURRENT_CNO)
869 return -EROFS; /* snapshot is not writable */
870
Al Viro2830ba72011-06-20 19:16:29 -0400871 return generic_permission(inode, mask);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900872}
873
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900874int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700875{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900876 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700877 struct nilfs_inode_info *ii = NILFS_I(inode);
878 int err;
879
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900880 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700881 if (ii->i_bh == NULL) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900882 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900883 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
884 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700885 if (unlikely(err))
886 return err;
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900887 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700888 if (ii->i_bh == NULL)
889 ii->i_bh = *pbh;
890 else {
891 brelse(*pbh);
892 *pbh = ii->i_bh;
893 }
894 } else
895 *pbh = ii->i_bh;
896
897 get_bh(*pbh);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900898 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700899 return 0;
900}
901
902int nilfs_inode_dirty(struct inode *inode)
903{
904 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900905 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700906 int ret = 0;
907
908 if (!list_empty(&ii->i_dirty)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900909 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700910 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
911 test_bit(NILFS_I_BUSY, &ii->i_state);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900912 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700913 }
914 return ret;
915}
916
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700917int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700918{
919 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900920 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700921
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900922 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700923
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700924 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700925 return 0;
926
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900927 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700928 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
929 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700930 /*
931 * Because this routine may race with nilfs_dispose_list(),
932 * we have to check NILFS_I_QUEUED here, too.
933 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700934 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700935 /*
936 * This will happen when somebody is freeing
937 * this inode.
938 */
Ryusuke Konishid6517de2016-08-02 14:05:14 -0700939 nilfs_msg(inode->i_sb, KERN_WARNING,
940 "cannot set file dirty (ino=%lu): the file is being freed",
941 inode->i_ino);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900942 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700943 return -EINVAL; /*
944 * NILFS_I_DIRTY may remain for
945 * freeing inode.
946 */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700947 }
Nicolas Kaisereaae0f32011-03-19 16:45:30 +0100948 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700949 set_bit(NILFS_I_QUEUED, &ii->i_state);
950 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900951 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700952 return 0;
953}
954
Andreas Rohnerb9f66142014-10-13 15:53:22 -0700955int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700956{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700957 struct buffer_head *ibh;
958 int err;
959
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900960 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700961 if (unlikely(err)) {
Ryusuke Konishid6517de2016-08-02 14:05:14 -0700962 nilfs_msg(inode->i_sb, KERN_WARNING,
963 "cannot mark inode dirty (ino=%lu): error %d loading inode block",
964 inode->i_ino, err);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700965 return err;
966 }
Andreas Rohnerb9f66142014-10-13 15:53:22 -0700967 nilfs_update_inode(inode, ibh, flags);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900968 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900969 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700970 brelse(ibh);
971 return 0;
972}
973
974/**
975 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
976 * @inode: inode of the file to be registered.
977 *
978 * nilfs_dirty_inode() loads a inode block containing the specified
979 * @inode and copies data from a nilfs_inode to a corresponding inode
980 * entry in the inode block. This operation is excluded from the segment
981 * construction. This function can be called both as a single operation
982 * and as a part of indivisible file operations.
983 */
Christoph Hellwigaa385722011-05-27 06:53:02 -0400984void nilfs_dirty_inode(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700985{
986 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900987 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700988
989 if (is_bad_inode(inode)) {
Ryusuke Konishid6517de2016-08-02 14:05:14 -0700990 nilfs_msg(inode->i_sb, KERN_WARNING,
991 "tried to mark bad_inode dirty. ignored.");
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700992 dump_stack();
993 return;
994 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900995 if (mdi) {
996 nilfs_mdt_mark_dirty(inode);
997 return;
998 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700999 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Andreas Rohnerb9f66142014-10-13 15:53:22 -07001000 __nilfs_mark_inode_dirty(inode, flags);
Ryusuke Konishi47420c72009-04-06 19:01:45 -07001001 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -07001002}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +09001003
1004int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1005 __u64 start, __u64 len)
1006{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +09001007 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi622daaff2010-12-26 16:38:43 +09001008 __u64 logical = 0, phys = 0, size = 0;
1009 __u32 flags = 0;
1010 loff_t isize;
1011 sector_t blkoff, end_blkoff;
1012 sector_t delalloc_blkoff;
1013 unsigned long delalloc_blklen;
1014 unsigned int blkbits = inode->i_blkbits;
1015 int ret, n;
1016
1017 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1018 if (ret)
1019 return ret;
1020
Al Viro59551022016-01-22 15:40:57 -05001021 inode_lock(inode);
Ryusuke Konishi622daaff2010-12-26 16:38:43 +09001022
1023 isize = i_size_read(inode);
1024
1025 blkoff = start >> blkbits;
1026 end_blkoff = (start + len - 1) >> blkbits;
1027
1028 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1029 &delalloc_blkoff);
1030
1031 do {
1032 __u64 blkphy;
1033 unsigned int maxblocks;
1034
1035 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1036 if (size) {
1037 /* End of the current extent */
1038 ret = fiemap_fill_next_extent(
1039 fieinfo, logical, phys, size, flags);
1040 if (ret)
1041 break;
1042 }
1043 if (blkoff > end_blkoff)
1044 break;
1045
1046 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1047 logical = blkoff << blkbits;
1048 phys = 0;
1049 size = delalloc_blklen << blkbits;
1050
1051 blkoff = delalloc_blkoff + delalloc_blklen;
1052 delalloc_blklen = nilfs_find_uncommitted_extent(
1053 inode, blkoff, &delalloc_blkoff);
1054 continue;
1055 }
1056
1057 /*
1058 * Limit the number of blocks that we look up so as
1059 * not to get into the next delayed allocation extent.
1060 */
1061 maxblocks = INT_MAX;
1062 if (delalloc_blklen)
1063 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1064 maxblocks);
1065 blkphy = 0;
1066
1067 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1068 n = nilfs_bmap_lookup_contig(
1069 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1070 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1071
1072 if (n < 0) {
1073 int past_eof;
1074
1075 if (unlikely(n != -ENOENT))
1076 break; /* error */
1077
1078 /* HOLE */
1079 blkoff++;
1080 past_eof = ((blkoff << blkbits) >= isize);
1081
1082 if (size) {
1083 /* End of the current extent */
1084
1085 if (past_eof)
1086 flags |= FIEMAP_EXTENT_LAST;
1087
1088 ret = fiemap_fill_next_extent(
1089 fieinfo, logical, phys, size, flags);
1090 if (ret)
1091 break;
1092 size = 0;
1093 }
1094 if (blkoff > end_blkoff || past_eof)
1095 break;
1096 } else {
1097 if (size) {
1098 if (phys && blkphy << blkbits == phys + size) {
1099 /* The current extent goes on */
1100 size += n << blkbits;
1101 } else {
1102 /* Terminate the current extent */
1103 ret = fiemap_fill_next_extent(
1104 fieinfo, logical, phys, size,
1105 flags);
1106 if (ret || blkoff > end_blkoff)
1107 break;
1108
1109 /* Start another extent */
1110 flags = FIEMAP_EXTENT_MERGED;
1111 logical = blkoff << blkbits;
1112 phys = blkphy << blkbits;
1113 size = n << blkbits;
1114 }
1115 } else {
1116 /* Start a new extent */
1117 flags = FIEMAP_EXTENT_MERGED;
1118 logical = blkoff << blkbits;
1119 phys = blkphy << blkbits;
1120 size = n << blkbits;
1121 }
1122 blkoff += n;
1123 }
1124 cond_resched();
1125 } while (true);
1126
1127 /* If ret is 1 then we just hit the end of the extent array */
1128 if (ret == 1)
1129 ret = 0;
1130
Al Viro59551022016-01-22 15:40:57 -05001131 inode_unlock(inode);
Ryusuke Konishi622daaff2010-12-26 16:38:43 +09001132 return ret;
1133}