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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
216static int nilfs_write_begin(struct file *file, struct address_space *mapping,
217 loff_t pos, unsigned len, unsigned flags,
218 struct page **pagep, void **fsdata)
219
220{
221 struct inode *inode = mapping->host;
222 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
223
224 if (unlikely(err))
225 return err;
226
Christoph Hellwig155130a2010-06-04 11:29:58 +0200227 err = block_write_begin(mapping, pos, len, flags, pagep,
228 nilfs_get_block);
229 if (unlikely(err)) {
230 loff_t isize = mapping->host->i_size;
231 if (pos + len > isize)
232 vmtruncate(mapping->host, isize);
233
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700234 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200235 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700236 return err;
237}
238
239static int nilfs_write_end(struct file *file, struct address_space *mapping,
240 loff_t pos, unsigned len, unsigned copied,
241 struct page *page, void *fsdata)
242{
243 struct inode *inode = mapping->host;
244 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
245 unsigned nr_dirty;
246 int err;
247
248 nr_dirty = nilfs_page_count_clean_buffers(page, start,
249 start + copied);
250 copied = generic_write_end(file, mapping, pos, len, copied, page,
251 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900252 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700253 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700254 return err ? : copied;
255}
256
257static ssize_t
258nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
259 loff_t offset, unsigned long nr_segs)
260{
261 struct file *file = iocb->ki_filp;
262 struct inode *inode = file->f_mapping->host;
263 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700264
265 if (rw == WRITE)
266 return 0;
267
268 /* Needs synchronization with the cleaner */
Christoph Hellwigaacfc19c2011-06-24 14:29:47 -0400269 size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
270 nilfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200271
272 /*
273 * In case of error extending write may have instantiated a few
274 * blocks outside i_size. Trim these off again.
275 */
276 if (unlikely((rw & WRITE) && size < 0)) {
277 loff_t isize = i_size_read(inode);
278 loff_t end = offset + iov_length(iov, nr_segs);
279
280 if (end > isize)
281 vmtruncate(inode, isize);
282 }
283
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700284 return size;
285}
286
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700287const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700288 .writepage = nilfs_writepage,
289 .readpage = nilfs_readpage,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700290 .writepages = nilfs_writepages,
291 .set_page_dirty = nilfs_set_page_dirty,
292 .readpages = nilfs_readpages,
293 .write_begin = nilfs_write_begin,
294 .write_end = nilfs_write_end,
295 /* .releasepage = nilfs_releasepage, */
296 .invalidatepage = block_invalidatepage,
297 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900298 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700299};
300
Al Viroc6e49e32011-07-26 03:07:14 -0400301struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700302{
303 struct super_block *sb = dir->i_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900304 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700305 struct inode *inode;
306 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900307 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700308 int err = -ENOMEM;
309 ino_t ino;
310
311 inode = new_inode(sb);
312 if (unlikely(!inode))
313 goto failed;
314
315 mapping_set_gfp_mask(inode->i_mapping,
316 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
317
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900318 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700319 ii = NILFS_I(inode);
320 ii->i_state = 1 << NILFS_I_NEW;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900321 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700322
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900323 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700324 if (unlikely(err))
325 goto failed_ifile_create_inode;
326 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
327
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900328 atomic_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300329 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700330 inode->i_ino = ino;
331 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
332
333 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
334 err = nilfs_bmap_read(ii->i_bmap, NULL);
335 if (err < 0)
336 goto failed_bmap;
337
338 set_bit(NILFS_I_BMAP, &ii->i_state);
339 /* No lock is needed; iget() ensures it. */
340 }
341
Ryusuke Konishib253a3e2011-01-20 02:09:53 +0900342 ii->i_flags = nilfs_mask_flags(
343 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700344
345 /* ii->i_file_acl = 0; */
346 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700347 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700348 nilfs_set_inode_flags(inode);
Ryusuke Konishi9b1fc4e42011-03-09 11:05:08 +0900349 spin_lock(&nilfs->ns_next_gen_lock);
350 inode->i_generation = nilfs->ns_next_generation++;
351 spin_unlock(&nilfs->ns_next_gen_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700352 insert_inode_hash(inode);
353
354 err = nilfs_init_acl(inode, dir);
355 if (unlikely(err))
356 goto failed_acl; /* never occur. When supporting
357 nilfs_init_acl(), proper cancellation of
358 above jobs should be considered */
359
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700360 return inode;
361
362 failed_acl:
363 failed_bmap:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200364 clear_nlink(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700365 iput(inode); /* raw_inode will be deleted through
366 generic_delete_inode() */
367 goto failed;
368
369 failed_ifile_create_inode:
370 make_bad_inode(inode);
371 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
372 called */
373 failed:
374 return ERR_PTR(err);
375}
376
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700377void nilfs_set_inode_flags(struct inode *inode)
378{
379 unsigned int flags = NILFS_I(inode)->i_flags;
380
381 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
382 S_DIRSYNC);
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900383 if (flags & FS_SYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700384 inode->i_flags |= S_SYNC;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900385 if (flags & FS_APPEND_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700386 inode->i_flags |= S_APPEND;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900387 if (flags & FS_IMMUTABLE_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700388 inode->i_flags |= S_IMMUTABLE;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900389 if (flags & FS_NOATIME_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700390 inode->i_flags |= S_NOATIME;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900391 if (flags & FS_DIRSYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700392 inode->i_flags |= S_DIRSYNC;
393 mapping_set_gfp_mask(inode->i_mapping,
394 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
395}
396
397int nilfs_read_inode_common(struct inode *inode,
398 struct nilfs_inode *raw_inode)
399{
400 struct nilfs_inode_info *ii = NILFS_I(inode);
401 int err;
402
403 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
404 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
405 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200406 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700407 inode->i_size = le64_to_cpu(raw_inode->i_size);
408 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
409 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
410 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700411 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
412 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
413 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
414 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700415 return -EINVAL; /* this inode is deleted */
416
417 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
418 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
419#if 0
420 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
421 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
422 0 : le32_to_cpu(raw_inode->i_dir_acl);
423#endif
Ryusuke Konishi3cc811b2009-09-28 13:02:46 +0900424 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700425 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
426
427 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
428 S_ISLNK(inode->i_mode)) {
429 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
430 if (err < 0)
431 return err;
432 set_bit(NILFS_I_BMAP, &ii->i_state);
433 /* No lock is needed; iget() ensures it. */
434 }
435 return 0;
436}
437
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900438static int __nilfs_read_inode(struct super_block *sb,
439 struct nilfs_root *root, unsigned long ino,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700440 struct inode *inode)
441{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900442 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700443 struct buffer_head *bh;
444 struct nilfs_inode *raw_inode;
445 int err;
446
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900447 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900448 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700449 if (unlikely(err))
450 goto bad_inode;
451
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900452 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700453
Ryusuke Konishi1b2f5a62009-08-22 19:10:07 +0900454 err = nilfs_read_inode_common(inode, raw_inode);
455 if (err)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700456 goto failed_unmap;
457
458 if (S_ISREG(inode->i_mode)) {
459 inode->i_op = &nilfs_file_inode_operations;
460 inode->i_fop = &nilfs_file_operations;
461 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700462 } else if (S_ISDIR(inode->i_mode)) {
463 inode->i_op = &nilfs_dir_inode_operations;
464 inode->i_fop = &nilfs_dir_operations;
465 inode->i_mapping->a_ops = &nilfs_aops;
466 } else if (S_ISLNK(inode->i_mode)) {
467 inode->i_op = &nilfs_symlink_inode_operations;
468 inode->i_mapping->a_ops = &nilfs_aops;
469 } else {
470 inode->i_op = &nilfs_special_inode_operations;
471 init_special_inode(
472 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900473 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700474 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900475 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700476 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900477 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700478 nilfs_set_inode_flags(inode);
479 return 0;
480
481 failed_unmap:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900482 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700483 brelse(bh);
484
485 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900486 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700487 return err;
488}
489
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900490static int nilfs_iget_test(struct inode *inode, void *opaque)
491{
492 struct nilfs_iget_args *args = opaque;
493 struct nilfs_inode_info *ii;
494
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900495 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900496 return 0;
497
498 ii = NILFS_I(inode);
499 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
500 return !args->for_gc;
501
502 return args->for_gc && args->cno == ii->i_cno;
503}
504
505static int nilfs_iget_set(struct inode *inode, void *opaque)
506{
507 struct nilfs_iget_args *args = opaque;
508
509 inode->i_ino = args->ino;
510 if (args->for_gc) {
511 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
512 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900513 NILFS_I(inode)->i_root = NULL;
514 } else {
515 if (args->root && args->ino == NILFS_ROOT_INO)
516 nilfs_get_root(args->root);
517 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900518 }
519 return 0;
520}
521
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900522struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
523 unsigned long ino)
524{
525 struct nilfs_iget_args args = {
526 .ino = ino, .root = root, .cno = 0, .for_gc = 0
527 };
528
529 return ilookup5(sb, ino, nilfs_iget_test, &args);
530}
531
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900532struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
533 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700534{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900535 struct nilfs_iget_args args = {
536 .ino = ino, .root = root, .cno = 0, .for_gc = 0
537 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900538
539 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
540}
541
542struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
543 unsigned long ino)
544{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700545 struct inode *inode;
546 int err;
547
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900548 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700549 if (unlikely(!inode))
550 return ERR_PTR(-ENOMEM);
551 if (!(inode->i_state & I_NEW))
552 return inode;
553
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900554 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700555 if (unlikely(err)) {
556 iget_failed(inode);
557 return ERR_PTR(err);
558 }
559 unlock_new_inode(inode);
560 return inode;
561}
562
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900563struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
564 __u64 cno)
565{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900566 struct nilfs_iget_args args = {
567 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
568 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900569 struct inode *inode;
570 int err;
571
572 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
573 if (unlikely(!inode))
574 return ERR_PTR(-ENOMEM);
575 if (!(inode->i_state & I_NEW))
576 return inode;
577
578 err = nilfs_init_gcinode(inode);
579 if (unlikely(err)) {
580 iget_failed(inode);
581 return ERR_PTR(err);
582 }
583 unlock_new_inode(inode);
584 return inode;
585}
586
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700587void nilfs_write_inode_common(struct inode *inode,
588 struct nilfs_inode *raw_inode, int has_bmap)
589{
590 struct nilfs_inode_info *ii = NILFS_I(inode);
591
592 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
593 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
594 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
595 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
596 raw_inode->i_size = cpu_to_le64(inode->i_size);
597 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
598 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700599 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
600 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700601 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
602
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700603 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
604 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
605
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900606 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
607 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
608
609 /* zero-fill unused portion in the case of super root block */
610 raw_inode->i_xattr = 0;
611 raw_inode->i_pad = 0;
612 memset((void *)raw_inode + sizeof(*raw_inode), 0,
613 nilfs->ns_inode_size - sizeof(*raw_inode));
614 }
615
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700616 if (has_bmap)
617 nilfs_bmap_write(ii->i_bmap, raw_inode);
618 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
619 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900620 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700621 /* When extending inode, nilfs->ns_inode_size should be checked
622 for substitutions of appended fields */
623}
624
625void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
626{
627 ino_t ino = inode->i_ino;
628 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900629 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700630 struct nilfs_inode *raw_inode;
631
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900632 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700633
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700634 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900635 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700636 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
637
638 nilfs_write_inode_common(inode, raw_inode, 0);
639 /* XXX: call with has_bmap = 0 is a workaround to avoid
640 deadlock of bmap. This delays update of i_bmap to just
641 before writing */
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900642 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700643}
644
645#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
646
647static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
648 unsigned long from)
649{
650 unsigned long b;
651 int ret;
652
653 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
654 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900655repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700656 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
657 if (ret == -ENOENT)
658 return;
659 else if (ret < 0)
660 goto failed;
661
662 if (b < from)
663 return;
664
665 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
666 ret = nilfs_bmap_truncate(ii->i_bmap, b);
667 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
668 if (!ret || (ret == -ENOMEM &&
669 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
670 goto repeat;
671
Ryusuke Konishie8289492010-11-19 15:26:20 +0900672failed:
673 nilfs_warning(ii->vfs_inode.i_sb, __func__,
674 "failed to truncate bmap (ino=%lu, err=%d)",
675 ii->vfs_inode.i_ino, ret);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700676}
677
678void nilfs_truncate(struct inode *inode)
679{
680 unsigned long blkoff;
681 unsigned int blocksize;
682 struct nilfs_transaction_info ti;
683 struct super_block *sb = inode->i_sb;
684 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700685
686 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
687 return;
688 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
689 return;
690
691 blocksize = sb->s_blocksize;
692 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700693 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700694
695 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
696
697 nilfs_truncate_bmap(ii, blkoff);
698
699 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
700 if (IS_SYNC(inode))
701 nilfs_set_transaction_flag(NILFS_TI_SYNC);
702
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900703 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900704 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700705 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700706 /* May construct a logical segment and may fail in sync mode.
707 But truncate has no return value. */
708}
709
Al Viro6fd1e5c2010-06-07 11:55:00 -0400710static void nilfs_clear_inode(struct inode *inode)
711{
712 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900713 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400714
715 /*
716 * Free resources allocated in nilfs_read_inode(), here.
717 */
718 BUG_ON(!list_empty(&ii->i_dirty));
719 brelse(ii->i_bh);
720 ii->i_bh = NULL;
721
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900722 if (mdi && mdi->mi_palloc_cache)
723 nilfs_palloc_destroy_cache(inode);
724
Al Viro6fd1e5c2010-06-07 11:55:00 -0400725 if (test_bit(NILFS_I_BMAP, &ii->i_state))
726 nilfs_bmap_clear(ii->i_bmap);
727
728 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900729
730 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
731 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400732}
733
734void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700735{
736 struct nilfs_transaction_info ti;
737 struct super_block *sb = inode->i_sb;
738 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900739 int ret;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700740
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900741 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700742 if (inode->i_data.nrpages)
743 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200744 clear_inode(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400745 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700746 return;
747 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700748 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
749
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700750 if (inode->i_data.nrpages)
751 truncate_inode_pages(&inode->i_data, 0);
752
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900753 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700754 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900755 nilfs_mark_inode_dirty(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200756 clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900757
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900758 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
759 if (!ret)
760 atomic_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900761
Al Viro6fd1e5c2010-06-07 11:55:00 -0400762 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900763
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700764 if (IS_SYNC(inode))
765 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700766 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700767 /* May construct a logical segment and may fail in sync mode.
768 But delete_inode has no return value. */
769}
770
771int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
772{
773 struct nilfs_transaction_info ti;
774 struct inode *inode = dentry->d_inode;
775 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700776 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700777
778 err = inode_change_ok(inode, iattr);
779 if (err)
780 return err;
781
782 err = nilfs_transaction_begin(sb, &ti, 0);
783 if (unlikely(err))
784 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700785
Christoph Hellwig10257742010-06-04 11:30:02 +0200786 if ((iattr->ia_valid & ATTR_SIZE) &&
787 iattr->ia_size != i_size_read(inode)) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400788 inode_dio_wait(inode);
789
Christoph Hellwig10257742010-06-04 11:30:02 +0200790 err = vmtruncate(inode, iattr->ia_size);
791 if (unlikely(err))
792 goto out_err;
793 }
794
795 setattr_copy(inode, iattr);
796 mark_inode_dirty(inode);
797
798 if (iattr->ia_valid & ATTR_MODE) {
799 err = nilfs_acl_chmod(inode);
800 if (unlikely(err))
801 goto out_err;
802 }
803
804 return nilfs_transaction_commit(sb);
805
806out_err:
807 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700808 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700809}
810
Al Viro10556cb2011-06-20 19:28:19 -0400811int nilfs_permission(struct inode *inode, int mask)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900812{
Al Viro730e9082011-06-18 20:21:44 -0400813 struct nilfs_root *root = NILFS_I(inode)->i_root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900814 if ((mask & MAY_WRITE) && root &&
815 root->cno != NILFS_CPTREE_CURRENT_CNO)
816 return -EROFS; /* snapshot is not writable */
817
Al Viro2830ba72011-06-20 19:16:29 -0400818 return generic_permission(inode, mask);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900819}
820
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900821int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700822{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900823 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700824 struct nilfs_inode_info *ii = NILFS_I(inode);
825 int err;
826
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900827 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700828 if (ii->i_bh == NULL) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900829 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900830 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
831 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700832 if (unlikely(err))
833 return err;
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900834 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700835 if (ii->i_bh == NULL)
836 ii->i_bh = *pbh;
837 else {
838 brelse(*pbh);
839 *pbh = ii->i_bh;
840 }
841 } else
842 *pbh = ii->i_bh;
843
844 get_bh(*pbh);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900845 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700846 return 0;
847}
848
849int nilfs_inode_dirty(struct inode *inode)
850{
851 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900852 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700853 int ret = 0;
854
855 if (!list_empty(&ii->i_dirty)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900856 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700857 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
858 test_bit(NILFS_I_BUSY, &ii->i_state);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900859 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700860 }
861 return ret;
862}
863
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900864int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700865{
866 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900867 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700868
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900869 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700870
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700871 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700872 return 0;
873
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900874 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700875 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
876 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
877 /* Because this routine may race with nilfs_dispose_list(),
878 we have to check NILFS_I_QUEUED here, too. */
879 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
880 /* This will happen when somebody is freeing
881 this inode. */
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900882 nilfs_warning(inode->i_sb, __func__,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700883 "cannot get inode (ino=%lu)\n",
884 inode->i_ino);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900885 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700886 return -EINVAL; /* NILFS_I_DIRTY may remain for
887 freeing inode */
888 }
Nicolas Kaisereaae0f32011-03-19 16:45:30 +0100889 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700890 set_bit(NILFS_I_QUEUED, &ii->i_state);
891 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900892 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700893 return 0;
894}
895
896int nilfs_mark_inode_dirty(struct inode *inode)
897{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700898 struct buffer_head *ibh;
899 int err;
900
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900901 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700902 if (unlikely(err)) {
903 nilfs_warning(inode->i_sb, __func__,
904 "failed to reget inode block.\n");
905 return err;
906 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700907 nilfs_update_inode(inode, ibh);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900908 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900909 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700910 brelse(ibh);
911 return 0;
912}
913
914/**
915 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
916 * @inode: inode of the file to be registered.
917 *
918 * nilfs_dirty_inode() loads a inode block containing the specified
919 * @inode and copies data from a nilfs_inode to a corresponding inode
920 * entry in the inode block. This operation is excluded from the segment
921 * construction. This function can be called both as a single operation
922 * and as a part of indivisible file operations.
923 */
Christoph Hellwigaa385722011-05-27 06:53:02 -0400924void nilfs_dirty_inode(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700925{
926 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900927 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700928
929 if (is_bad_inode(inode)) {
930 nilfs_warning(inode->i_sb, __func__,
931 "tried to mark bad_inode dirty. ignored.\n");
932 dump_stack();
933 return;
934 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900935 if (mdi) {
936 nilfs_mdt_mark_dirty(inode);
937 return;
938 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700939 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700940 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700941 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700942}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900943
944int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
945 __u64 start, __u64 len)
946{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900947 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900948 __u64 logical = 0, phys = 0, size = 0;
949 __u32 flags = 0;
950 loff_t isize;
951 sector_t blkoff, end_blkoff;
952 sector_t delalloc_blkoff;
953 unsigned long delalloc_blklen;
954 unsigned int blkbits = inode->i_blkbits;
955 int ret, n;
956
957 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
958 if (ret)
959 return ret;
960
961 mutex_lock(&inode->i_mutex);
962
963 isize = i_size_read(inode);
964
965 blkoff = start >> blkbits;
966 end_blkoff = (start + len - 1) >> blkbits;
967
968 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
969 &delalloc_blkoff);
970
971 do {
972 __u64 blkphy;
973 unsigned int maxblocks;
974
975 if (delalloc_blklen && blkoff == delalloc_blkoff) {
976 if (size) {
977 /* End of the current extent */
978 ret = fiemap_fill_next_extent(
979 fieinfo, logical, phys, size, flags);
980 if (ret)
981 break;
982 }
983 if (blkoff > end_blkoff)
984 break;
985
986 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
987 logical = blkoff << blkbits;
988 phys = 0;
989 size = delalloc_blklen << blkbits;
990
991 blkoff = delalloc_blkoff + delalloc_blklen;
992 delalloc_blklen = nilfs_find_uncommitted_extent(
993 inode, blkoff, &delalloc_blkoff);
994 continue;
995 }
996
997 /*
998 * Limit the number of blocks that we look up so as
999 * not to get into the next delayed allocation extent.
1000 */
1001 maxblocks = INT_MAX;
1002 if (delalloc_blklen)
1003 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1004 maxblocks);
1005 blkphy = 0;
1006
1007 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1008 n = nilfs_bmap_lookup_contig(
1009 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1010 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1011
1012 if (n < 0) {
1013 int past_eof;
1014
1015 if (unlikely(n != -ENOENT))
1016 break; /* error */
1017
1018 /* HOLE */
1019 blkoff++;
1020 past_eof = ((blkoff << blkbits) >= isize);
1021
1022 if (size) {
1023 /* End of the current extent */
1024
1025 if (past_eof)
1026 flags |= FIEMAP_EXTENT_LAST;
1027
1028 ret = fiemap_fill_next_extent(
1029 fieinfo, logical, phys, size, flags);
1030 if (ret)
1031 break;
1032 size = 0;
1033 }
1034 if (blkoff > end_blkoff || past_eof)
1035 break;
1036 } else {
1037 if (size) {
1038 if (phys && blkphy << blkbits == phys + size) {
1039 /* The current extent goes on */
1040 size += n << blkbits;
1041 } else {
1042 /* Terminate the current extent */
1043 ret = fiemap_fill_next_extent(
1044 fieinfo, logical, phys, size,
1045 flags);
1046 if (ret || blkoff > end_blkoff)
1047 break;
1048
1049 /* Start another extent */
1050 flags = FIEMAP_EXTENT_MERGED;
1051 logical = blkoff << blkbits;
1052 phys = blkphy << blkbits;
1053 size = n << blkbits;
1054 }
1055 } else {
1056 /* Start a new extent */
1057 flags = FIEMAP_EXTENT_MERGED;
1058 logical = blkoff << blkbits;
1059 phys = blkphy << blkbits;
1060 size = n << blkbits;
1061 }
1062 blkoff += n;
1063 }
1064 cond_resched();
1065 } while (true);
1066
1067 /* If ret is 1 then we just hit the end of the extent array */
1068 if (ret == 1)
1069 ret = 0;
1070
1071 mutex_unlock(&inode->i_mutex);
1072 return ret;
1073}