blob: 6b49f14eac8cdadf4bebc9f4ff9c1869b5107f12 [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 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/gfp.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070026#include <linux/mpage.h>
27#include <linux/writeback.h>
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -070028#include <linux/uio.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070029#include "nilfs.h"
Al Viro6fd1e5c2010-06-07 11:55:00 -040030#include "btnode.h"
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070031#include "segment.h"
32#include "page.h"
33#include "mdt.h"
34#include "cpfile.h"
35#include "ifile.h"
36
Vyacheslav Dubeykof5974c82012-07-30 14:42:10 -070037/**
38 * struct nilfs_iget_args - arguments used during comparison between inodes
39 * @ino: inode number
40 * @cno: checkpoint number
41 * @root: pointer on NILFS root object (mounted checkpoint)
42 * @for_gc: inode for GC flag
43 */
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090044struct nilfs_iget_args {
45 u64 ino;
46 __u64 cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +090047 struct nilfs_root *root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090048 int for_gc;
49};
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070050
Ryusuke Konishibe667372011-03-05 00:19:32 +090051void nilfs_inode_add_blocks(struct inode *inode, int n)
52{
53 struct nilfs_root *root = NILFS_I(inode)->i_root;
54
55 inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
56 if (root)
57 atomic_add(n, &root->blocks_count);
58}
59
60void nilfs_inode_sub_blocks(struct inode *inode, int n)
61{
62 struct nilfs_root *root = NILFS_I(inode)->i_root;
63
64 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
65 if (root)
66 atomic_sub(n, &root->blocks_count);
67}
68
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070069/**
70 * nilfs_get_block() - get a file block on the filesystem (callback function)
71 * @inode - inode struct of the target file
72 * @blkoff - file block number
73 * @bh_result - buffer head to be mapped on
74 * @create - indicate whether allocating the block or not when it has not
75 * been allocated yet.
76 *
77 * This function does not issue actual read request of the specified data
78 * block. It is done by VFS.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070079 */
80int nilfs_get_block(struct inode *inode, sector_t blkoff,
81 struct buffer_head *bh_result, int create)
82{
83 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090084 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090085 __u64 blknum = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070086 int err = 0, ret;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090087 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070088
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090089 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090090 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090091 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090092 if (ret >= 0) { /* found */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070093 map_bh(bh_result, inode->i_sb, blknum);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090094 if (ret > 0)
95 bh_result->b_size = (ret << inode->i_blkbits);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070096 goto out;
97 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070098 /* data block was not found */
99 if (ret == -ENOENT && create) {
100 struct nilfs_transaction_info ti;
101
102 bh_result->b_blocknr = 0;
103 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
104 if (unlikely(err))
105 goto out;
106 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
107 (unsigned long)bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700108 if (unlikely(err != 0)) {
109 if (err == -EEXIST) {
110 /*
111 * The get_block() function could be called
112 * from multiple callers for an inode.
113 * However, the page having this block must
114 * be locked in this case.
115 */
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700116 printk(KERN_WARNING
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700117 "nilfs_get_block: a race condition "
118 "while inserting a data block. "
119 "(inode number=%lu, file block "
120 "offset=%llu)\n",
121 inode->i_ino,
122 (unsigned long long)blkoff);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700123 err = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700124 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700125 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700126 goto out;
127 }
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900128 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700129 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700130 /* Error handling should be detailed */
131 set_buffer_new(bh_result);
Ryusuke Konishi27e6c7a2010-12-26 16:28:28 +0900132 set_buffer_delay(bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700133 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
134 to proper value */
135 } else if (ret == -ENOENT) {
136 /* not found is not error (e.g. hole); must return without
137 the mapped state flag. */
138 ;
139 } else {
140 err = ret;
141 }
142
143 out:
144 return err;
145}
146
147/**
148 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
149 * address_space_operations.
150 * @file - file struct of the file to be read
151 * @page - the page to be read
152 */
153static int nilfs_readpage(struct file *file, struct page *page)
154{
155 return mpage_readpage(page, nilfs_get_block);
156}
157
158/**
159 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
160 * address_space_operations.
161 * @file - file struct of the file to be read
162 * @mapping - address_space struct used for reading multiple pages
163 * @pages - the pages to be read
164 * @nr_pages - number of pages to be read
165 */
166static int nilfs_readpages(struct file *file, struct address_space *mapping,
167 struct list_head *pages, unsigned nr_pages)
168{
169 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
170}
171
172static int nilfs_writepages(struct address_space *mapping,
173 struct writeback_control *wbc)
174{
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700175 struct inode *inode = mapping->host;
176 int err = 0;
177
178 if (wbc->sync_mode == WB_SYNC_ALL)
179 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
180 wbc->range_start,
181 wbc->range_end);
182 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700183}
184
185static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
186{
187 struct inode *inode = page->mapping->host;
188 int err;
189
190 redirty_page_for_writepage(wbc, page);
191 unlock_page(page);
192
193 if (wbc->sync_mode == WB_SYNC_ALL) {
194 err = nilfs_construct_segment(inode->i_sb);
195 if (unlikely(err))
196 return err;
197 } else if (wbc->for_reclaim)
198 nilfs_flush_segment(inode->i_sb, inode->i_ino);
199
200 return 0;
201}
202
203static int nilfs_set_page_dirty(struct page *page)
204{
205 int ret = __set_page_dirty_buffers(page);
206
207 if (ret) {
208 struct inode *inode = page->mapping->host;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700209 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
210
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900211 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700212 }
213 return ret;
214}
215
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100216void nilfs_write_failed(struct address_space *mapping, loff_t to)
217{
218 struct inode *inode = mapping->host;
219
220 if (to > inode->i_size) {
221 truncate_pagecache(inode, to, inode->i_size);
222 nilfs_truncate(inode);
223 }
224}
225
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700226static int nilfs_write_begin(struct file *file, struct address_space *mapping,
227 loff_t pos, unsigned len, unsigned flags,
228 struct page **pagep, void **fsdata)
229
230{
231 struct inode *inode = mapping->host;
232 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
233
234 if (unlikely(err))
235 return err;
236
Christoph Hellwig155130a2010-06-04 11:29:58 +0200237 err = block_write_begin(mapping, pos, len, flags, pagep,
238 nilfs_get_block);
239 if (unlikely(err)) {
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100240 nilfs_write_failed(mapping, pos + len);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700241 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200242 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700243 return err;
244}
245
246static int nilfs_write_end(struct file *file, struct address_space *mapping,
247 loff_t pos, unsigned len, unsigned copied,
248 struct page *page, void *fsdata)
249{
250 struct inode *inode = mapping->host;
251 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
252 unsigned nr_dirty;
253 int err;
254
255 nr_dirty = nilfs_page_count_clean_buffers(page, start,
256 start + copied);
257 copied = generic_write_end(file, mapping, pos, len, copied, page,
258 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900259 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700260 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700261 return err ? : copied;
262}
263
264static ssize_t
265nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
266 loff_t offset, unsigned long nr_segs)
267{
268 struct file *file = iocb->ki_filp;
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100269 struct address_space *mapping = file->f_mapping;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700270 struct inode *inode = file->f_mapping->host;
271 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700272
273 if (rw == WRITE)
274 return 0;
275
276 /* Needs synchronization with the cleaner */
Christoph Hellwigaacfc19c2011-06-24 14:29:47 -0400277 size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
278 nilfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200279
280 /*
281 * In case of error extending write may have instantiated a few
282 * blocks outside i_size. Trim these off again.
283 */
284 if (unlikely((rw & WRITE) && size < 0)) {
285 loff_t isize = i_size_read(inode);
286 loff_t end = offset + iov_length(iov, nr_segs);
287
288 if (end > isize)
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100289 nilfs_write_failed(mapping, end);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200290 }
291
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700292 return size;
293}
294
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700295const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700296 .writepage = nilfs_writepage,
297 .readpage = nilfs_readpage,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700298 .writepages = nilfs_writepages,
299 .set_page_dirty = nilfs_set_page_dirty,
300 .readpages = nilfs_readpages,
301 .write_begin = nilfs_write_begin,
302 .write_end = nilfs_write_end,
303 /* .releasepage = nilfs_releasepage, */
304 .invalidatepage = block_invalidatepage,
305 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900306 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700307};
308
Al Viroc6e49e32011-07-26 03:07:14 -0400309struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700310{
311 struct super_block *sb = dir->i_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900312 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700313 struct inode *inode;
314 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900315 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700316 int err = -ENOMEM;
317 ino_t ino;
318
319 inode = new_inode(sb);
320 if (unlikely(!inode))
321 goto failed;
322
323 mapping_set_gfp_mask(inode->i_mapping,
324 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
325
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900326 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700327 ii = NILFS_I(inode);
328 ii->i_state = 1 << NILFS_I_NEW;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900329 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700330
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900331 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700332 if (unlikely(err))
333 goto failed_ifile_create_inode;
334 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
335
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900336 atomic_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300337 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700338 inode->i_ino = ino;
339 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
340
341 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
342 err = nilfs_bmap_read(ii->i_bmap, NULL);
343 if (err < 0)
344 goto failed_bmap;
345
346 set_bit(NILFS_I_BMAP, &ii->i_state);
347 /* No lock is needed; iget() ensures it. */
348 }
349
Ryusuke Konishib253a3e2011-01-20 02:09:53 +0900350 ii->i_flags = nilfs_mask_flags(
351 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700352
353 /* ii->i_file_acl = 0; */
354 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700355 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700356 nilfs_set_inode_flags(inode);
Ryusuke Konishi9b1fc4e42011-03-09 11:05:08 +0900357 spin_lock(&nilfs->ns_next_gen_lock);
358 inode->i_generation = nilfs->ns_next_generation++;
359 spin_unlock(&nilfs->ns_next_gen_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700360 insert_inode_hash(inode);
361
362 err = nilfs_init_acl(inode, dir);
363 if (unlikely(err))
364 goto failed_acl; /* never occur. When supporting
365 nilfs_init_acl(), proper cancellation of
366 above jobs should be considered */
367
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700368 return inode;
369
370 failed_acl:
371 failed_bmap:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200372 clear_nlink(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700373 iput(inode); /* raw_inode will be deleted through
374 generic_delete_inode() */
375 goto failed;
376
377 failed_ifile_create_inode:
378 make_bad_inode(inode);
379 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
380 called */
381 failed:
382 return ERR_PTR(err);
383}
384
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700385void nilfs_set_inode_flags(struct inode *inode)
386{
387 unsigned int flags = NILFS_I(inode)->i_flags;
388
389 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
390 S_DIRSYNC);
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900391 if (flags & FS_SYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700392 inode->i_flags |= S_SYNC;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900393 if (flags & FS_APPEND_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700394 inode->i_flags |= S_APPEND;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900395 if (flags & FS_IMMUTABLE_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700396 inode->i_flags |= S_IMMUTABLE;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900397 if (flags & FS_NOATIME_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700398 inode->i_flags |= S_NOATIME;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900399 if (flags & FS_DIRSYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700400 inode->i_flags |= S_DIRSYNC;
401 mapping_set_gfp_mask(inode->i_mapping,
402 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
403}
404
405int nilfs_read_inode_common(struct inode *inode,
406 struct nilfs_inode *raw_inode)
407{
408 struct nilfs_inode_info *ii = NILFS_I(inode);
409 int err;
410
411 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
Eric W. Biederman305d3d02012-02-10 12:31:23 -0800412 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
413 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +0200414 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700415 inode->i_size = le64_to_cpu(raw_inode->i_size);
416 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
417 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
418 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700419 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
420 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
421 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
422 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700423 return -EINVAL; /* this inode is deleted */
424
425 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
426 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
427#if 0
428 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
429 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
430 0 : le32_to_cpu(raw_inode->i_dir_acl);
431#endif
Ryusuke Konishi3cc811b2009-09-28 13:02:46 +0900432 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700433 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
434
435 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
436 S_ISLNK(inode->i_mode)) {
437 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
438 if (err < 0)
439 return err;
440 set_bit(NILFS_I_BMAP, &ii->i_state);
441 /* No lock is needed; iget() ensures it. */
442 }
443 return 0;
444}
445
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900446static int __nilfs_read_inode(struct super_block *sb,
447 struct nilfs_root *root, unsigned long ino,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700448 struct inode *inode)
449{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900450 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700451 struct buffer_head *bh;
452 struct nilfs_inode *raw_inode;
453 int err;
454
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900455 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900456 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700457 if (unlikely(err))
458 goto bad_inode;
459
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900460 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700461
Ryusuke Konishi1b2f5a62009-08-22 19:10:07 +0900462 err = nilfs_read_inode_common(inode, raw_inode);
463 if (err)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700464 goto failed_unmap;
465
466 if (S_ISREG(inode->i_mode)) {
467 inode->i_op = &nilfs_file_inode_operations;
468 inode->i_fop = &nilfs_file_operations;
469 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700470 } else if (S_ISDIR(inode->i_mode)) {
471 inode->i_op = &nilfs_dir_inode_operations;
472 inode->i_fop = &nilfs_dir_operations;
473 inode->i_mapping->a_ops = &nilfs_aops;
474 } else if (S_ISLNK(inode->i_mode)) {
475 inode->i_op = &nilfs_symlink_inode_operations;
476 inode->i_mapping->a_ops = &nilfs_aops;
477 } else {
478 inode->i_op = &nilfs_special_inode_operations;
479 init_special_inode(
480 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900481 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700482 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900483 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700484 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900485 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700486 nilfs_set_inode_flags(inode);
487 return 0;
488
489 failed_unmap:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900490 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700491 brelse(bh);
492
493 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900494 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700495 return err;
496}
497
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900498static int nilfs_iget_test(struct inode *inode, void *opaque)
499{
500 struct nilfs_iget_args *args = opaque;
501 struct nilfs_inode_info *ii;
502
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900503 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900504 return 0;
505
506 ii = NILFS_I(inode);
507 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
508 return !args->for_gc;
509
510 return args->for_gc && args->cno == ii->i_cno;
511}
512
513static int nilfs_iget_set(struct inode *inode, void *opaque)
514{
515 struct nilfs_iget_args *args = opaque;
516
517 inode->i_ino = args->ino;
518 if (args->for_gc) {
519 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
520 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900521 NILFS_I(inode)->i_root = NULL;
522 } else {
523 if (args->root && args->ino == NILFS_ROOT_INO)
524 nilfs_get_root(args->root);
525 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900526 }
527 return 0;
528}
529
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900530struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
531 unsigned long ino)
532{
533 struct nilfs_iget_args args = {
534 .ino = ino, .root = root, .cno = 0, .for_gc = 0
535 };
536
537 return ilookup5(sb, ino, nilfs_iget_test, &args);
538}
539
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900540struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
541 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700542{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900543 struct nilfs_iget_args args = {
544 .ino = ino, .root = root, .cno = 0, .for_gc = 0
545 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900546
547 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
548}
549
550struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
551 unsigned long ino)
552{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700553 struct inode *inode;
554 int err;
555
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900556 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700557 if (unlikely(!inode))
558 return ERR_PTR(-ENOMEM);
559 if (!(inode->i_state & I_NEW))
560 return inode;
561
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900562 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700563 if (unlikely(err)) {
564 iget_failed(inode);
565 return ERR_PTR(err);
566 }
567 unlock_new_inode(inode);
568 return inode;
569}
570
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900571struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
572 __u64 cno)
573{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900574 struct nilfs_iget_args args = {
575 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
576 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900577 struct inode *inode;
578 int err;
579
580 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
581 if (unlikely(!inode))
582 return ERR_PTR(-ENOMEM);
583 if (!(inode->i_state & I_NEW))
584 return inode;
585
586 err = nilfs_init_gcinode(inode);
587 if (unlikely(err)) {
588 iget_failed(inode);
589 return ERR_PTR(err);
590 }
591 unlock_new_inode(inode);
592 return inode;
593}
594
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700595void nilfs_write_inode_common(struct inode *inode,
596 struct nilfs_inode *raw_inode, int has_bmap)
597{
598 struct nilfs_inode_info *ii = NILFS_I(inode);
599
600 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
Eric W. Biederman305d3d02012-02-10 12:31:23 -0800601 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
602 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700603 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
604 raw_inode->i_size = cpu_to_le64(inode->i_size);
605 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
606 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700607 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
608 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700609 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
610
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700611 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
612 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
613
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900614 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
615 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
616
617 /* zero-fill unused portion in the case of super root block */
618 raw_inode->i_xattr = 0;
619 raw_inode->i_pad = 0;
620 memset((void *)raw_inode + sizeof(*raw_inode), 0,
621 nilfs->ns_inode_size - sizeof(*raw_inode));
622 }
623
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700624 if (has_bmap)
625 nilfs_bmap_write(ii->i_bmap, raw_inode);
626 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
627 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900628 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700629 /* When extending inode, nilfs->ns_inode_size should be checked
630 for substitutions of appended fields */
631}
632
633void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
634{
635 ino_t ino = inode->i_ino;
636 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900637 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700638 struct nilfs_inode *raw_inode;
639
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900640 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700641
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700642 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900643 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700644 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
645
646 nilfs_write_inode_common(inode, raw_inode, 0);
647 /* XXX: call with has_bmap = 0 is a workaround to avoid
648 deadlock of bmap. This delays update of i_bmap to just
649 before writing */
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900650 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700651}
652
653#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
654
655static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
656 unsigned long from)
657{
658 unsigned long b;
659 int ret;
660
661 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
662 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900663repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700664 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
665 if (ret == -ENOENT)
666 return;
667 else if (ret < 0)
668 goto failed;
669
670 if (b < from)
671 return;
672
673 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
674 ret = nilfs_bmap_truncate(ii->i_bmap, b);
675 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
676 if (!ret || (ret == -ENOMEM &&
677 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
678 goto repeat;
679
Ryusuke Konishie8289492010-11-19 15:26:20 +0900680failed:
681 nilfs_warning(ii->vfs_inode.i_sb, __func__,
682 "failed to truncate bmap (ino=%lu, err=%d)",
683 ii->vfs_inode.i_ino, ret);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700684}
685
686void nilfs_truncate(struct inode *inode)
687{
688 unsigned long blkoff;
689 unsigned int blocksize;
690 struct nilfs_transaction_info ti;
691 struct super_block *sb = inode->i_sb;
692 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700693
694 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
695 return;
696 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
697 return;
698
699 blocksize = sb->s_blocksize;
700 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700701 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700702
703 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
704
705 nilfs_truncate_bmap(ii, blkoff);
706
707 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
708 if (IS_SYNC(inode))
709 nilfs_set_transaction_flag(NILFS_TI_SYNC);
710
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900711 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900712 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700713 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700714 /* May construct a logical segment and may fail in sync mode.
715 But truncate has no return value. */
716}
717
Al Viro6fd1e5c2010-06-07 11:55:00 -0400718static void nilfs_clear_inode(struct inode *inode)
719{
720 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900721 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400722
723 /*
724 * Free resources allocated in nilfs_read_inode(), here.
725 */
726 BUG_ON(!list_empty(&ii->i_dirty));
727 brelse(ii->i_bh);
728 ii->i_bh = NULL;
729
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900730 if (mdi && mdi->mi_palloc_cache)
731 nilfs_palloc_destroy_cache(inode);
732
Al Viro6fd1e5c2010-06-07 11:55:00 -0400733 if (test_bit(NILFS_I_BMAP, &ii->i_state))
734 nilfs_bmap_clear(ii->i_bmap);
735
736 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900737
738 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
739 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400740}
741
742void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700743{
744 struct nilfs_transaction_info ti;
745 struct super_block *sb = inode->i_sb;
746 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900747 int ret;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700748
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900749 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700750 if (inode->i_data.nrpages)
751 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200752 clear_inode(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400753 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700754 return;
755 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700756 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
757
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700758 if (inode->i_data.nrpages)
759 truncate_inode_pages(&inode->i_data, 0);
760
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900761 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700762 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900763 nilfs_mark_inode_dirty(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200764 clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900765
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900766 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
767 if (!ret)
768 atomic_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900769
Al Viro6fd1e5c2010-06-07 11:55:00 -0400770 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900771
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700772 if (IS_SYNC(inode))
773 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700774 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700775 /* May construct a logical segment and may fail in sync mode.
776 But delete_inode has no return value. */
777}
778
779int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
780{
781 struct nilfs_transaction_info ti;
782 struct inode *inode = dentry->d_inode;
783 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700784 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700785
786 err = inode_change_ok(inode, iattr);
787 if (err)
788 return err;
789
790 err = nilfs_transaction_begin(sb, &ti, 0);
791 if (unlikely(err))
792 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700793
Christoph Hellwig10257742010-06-04 11:30:02 +0200794 if ((iattr->ia_valid & ATTR_SIZE) &&
795 iattr->ia_size != i_size_read(inode)) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400796 inode_dio_wait(inode);
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100797 truncate_setsize(inode, iattr->ia_size);
798 nilfs_truncate(inode);
Christoph Hellwig10257742010-06-04 11:30:02 +0200799 }
800
801 setattr_copy(inode, iattr);
802 mark_inode_dirty(inode);
803
804 if (iattr->ia_valid & ATTR_MODE) {
805 err = nilfs_acl_chmod(inode);
806 if (unlikely(err))
807 goto out_err;
808 }
809
810 return nilfs_transaction_commit(sb);
811
812out_err:
813 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700814 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700815}
816
Al Viro10556cb2011-06-20 19:28:19 -0400817int nilfs_permission(struct inode *inode, int mask)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900818{
Al Viro730e9082011-06-18 20:21:44 -0400819 struct nilfs_root *root = NILFS_I(inode)->i_root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900820 if ((mask & MAY_WRITE) && root &&
821 root->cno != NILFS_CPTREE_CURRENT_CNO)
822 return -EROFS; /* snapshot is not writable */
823
Al Viro2830ba72011-06-20 19:16:29 -0400824 return generic_permission(inode, mask);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900825}
826
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900827int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700828{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900829 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700830 struct nilfs_inode_info *ii = NILFS_I(inode);
831 int err;
832
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900833 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700834 if (ii->i_bh == NULL) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900835 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900836 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
837 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700838 if (unlikely(err))
839 return err;
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900840 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700841 if (ii->i_bh == NULL)
842 ii->i_bh = *pbh;
843 else {
844 brelse(*pbh);
845 *pbh = ii->i_bh;
846 }
847 } else
848 *pbh = ii->i_bh;
849
850 get_bh(*pbh);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900851 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700852 return 0;
853}
854
855int nilfs_inode_dirty(struct inode *inode)
856{
857 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900858 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700859 int ret = 0;
860
861 if (!list_empty(&ii->i_dirty)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900862 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700863 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
864 test_bit(NILFS_I_BUSY, &ii->i_state);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900865 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700866 }
867 return ret;
868}
869
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900870int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700871{
872 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900873 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700874
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900875 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700876
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700877 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700878 return 0;
879
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900880 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700881 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
882 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
883 /* Because this routine may race with nilfs_dispose_list(),
884 we have to check NILFS_I_QUEUED here, too. */
885 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
886 /* This will happen when somebody is freeing
887 this inode. */
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900888 nilfs_warning(inode->i_sb, __func__,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700889 "cannot get inode (ino=%lu)\n",
890 inode->i_ino);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900891 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700892 return -EINVAL; /* NILFS_I_DIRTY may remain for
893 freeing inode */
894 }
Nicolas Kaisereaae0f32011-03-19 16:45:30 +0100895 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700896 set_bit(NILFS_I_QUEUED, &ii->i_state);
897 }
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_mark_inode_dirty(struct inode *inode)
903{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700904 struct buffer_head *ibh;
905 int err;
906
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900907 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700908 if (unlikely(err)) {
909 nilfs_warning(inode->i_sb, __func__,
910 "failed to reget inode block.\n");
911 return err;
912 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700913 nilfs_update_inode(inode, ibh);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900914 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900915 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700916 brelse(ibh);
917 return 0;
918}
919
920/**
921 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
922 * @inode: inode of the file to be registered.
923 *
924 * nilfs_dirty_inode() loads a inode block containing the specified
925 * @inode and copies data from a nilfs_inode to a corresponding inode
926 * entry in the inode block. This operation is excluded from the segment
927 * construction. This function can be called both as a single operation
928 * and as a part of indivisible file operations.
929 */
Christoph Hellwigaa385722011-05-27 06:53:02 -0400930void nilfs_dirty_inode(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700931{
932 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900933 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700934
935 if (is_bad_inode(inode)) {
936 nilfs_warning(inode->i_sb, __func__,
937 "tried to mark bad_inode dirty. ignored.\n");
938 dump_stack();
939 return;
940 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900941 if (mdi) {
942 nilfs_mdt_mark_dirty(inode);
943 return;
944 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700945 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700946 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700947 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700948}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900949
950int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
951 __u64 start, __u64 len)
952{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900953 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900954 __u64 logical = 0, phys = 0, size = 0;
955 __u32 flags = 0;
956 loff_t isize;
957 sector_t blkoff, end_blkoff;
958 sector_t delalloc_blkoff;
959 unsigned long delalloc_blklen;
960 unsigned int blkbits = inode->i_blkbits;
961 int ret, n;
962
963 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
964 if (ret)
965 return ret;
966
967 mutex_lock(&inode->i_mutex);
968
969 isize = i_size_read(inode);
970
971 blkoff = start >> blkbits;
972 end_blkoff = (start + len - 1) >> blkbits;
973
974 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
975 &delalloc_blkoff);
976
977 do {
978 __u64 blkphy;
979 unsigned int maxblocks;
980
981 if (delalloc_blklen && blkoff == delalloc_blkoff) {
982 if (size) {
983 /* End of the current extent */
984 ret = fiemap_fill_next_extent(
985 fieinfo, logical, phys, size, flags);
986 if (ret)
987 break;
988 }
989 if (blkoff > end_blkoff)
990 break;
991
992 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
993 logical = blkoff << blkbits;
994 phys = 0;
995 size = delalloc_blklen << blkbits;
996
997 blkoff = delalloc_blkoff + delalloc_blklen;
998 delalloc_blklen = nilfs_find_uncommitted_extent(
999 inode, blkoff, &delalloc_blkoff);
1000 continue;
1001 }
1002
1003 /*
1004 * Limit the number of blocks that we look up so as
1005 * not to get into the next delayed allocation extent.
1006 */
1007 maxblocks = INT_MAX;
1008 if (delalloc_blklen)
1009 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1010 maxblocks);
1011 blkphy = 0;
1012
1013 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1014 n = nilfs_bmap_lookup_contig(
1015 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1016 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1017
1018 if (n < 0) {
1019 int past_eof;
1020
1021 if (unlikely(n != -ENOENT))
1022 break; /* error */
1023
1024 /* HOLE */
1025 blkoff++;
1026 past_eof = ((blkoff << blkbits) >= isize);
1027
1028 if (size) {
1029 /* End of the current extent */
1030
1031 if (past_eof)
1032 flags |= FIEMAP_EXTENT_LAST;
1033
1034 ret = fiemap_fill_next_extent(
1035 fieinfo, logical, phys, size, flags);
1036 if (ret)
1037 break;
1038 size = 0;
1039 }
1040 if (blkoff > end_blkoff || past_eof)
1041 break;
1042 } else {
1043 if (size) {
1044 if (phys && blkphy << blkbits == phys + size) {
1045 /* The current extent goes on */
1046 size += n << blkbits;
1047 } else {
1048 /* Terminate the current extent */
1049 ret = fiemap_fill_next_extent(
1050 fieinfo, logical, phys, size,
1051 flags);
1052 if (ret || blkoff > end_blkoff)
1053 break;
1054
1055 /* Start another extent */
1056 flags = FIEMAP_EXTENT_MERGED;
1057 logical = blkoff << blkbits;
1058 phys = blkphy << blkbits;
1059 size = n << blkbits;
1060 }
1061 } else {
1062 /* Start a new extent */
1063 flags = FIEMAP_EXTENT_MERGED;
1064 logical = blkoff << blkbits;
1065 phys = blkphy << blkbits;
1066 size = n << blkbits;
1067 }
1068 blkoff += n;
1069 }
1070 cond_resched();
1071 } while (true);
1072
1073 /* If ret is 1 then we just hit the end of the extent array */
1074 if (ret == 1)
1075 ret = 0;
1076
1077 mutex_unlock(&inode->i_mutex);
1078 return ret;
1079}