blob: 7e350c562e0ea1dd491a8ee6c72371b770666e1f [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>
Kent Overstreeta27bb332013-05-07 16:19:08 -070028#include <linux/aio.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)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -070057 atomic64_add(n, &root->blocks_count);
Ryusuke Konishibe667372011-03-05 00:19:32 +090058}
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)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -070066 atomic64_sub(n, &root->blocks_count);
Ryusuke Konishibe667372011-03-05 00:19:32 +090067}
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
Vyacheslav Dubeyko8c26c4e2013-04-30 15:27:48 -0700178 if (inode->i_sb->s_flags & MS_RDONLY) {
179 nilfs_clear_dirty_pages(mapping, false);
180 return -EROFS;
181 }
182
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700183 if (wbc->sync_mode == WB_SYNC_ALL)
184 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
185 wbc->range_start,
186 wbc->range_end);
187 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700188}
189
190static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
191{
192 struct inode *inode = page->mapping->host;
193 int err;
194
Vyacheslav Dubeykoeb53b6d2013-04-30 15:27:51 -0700195 if (inode->i_sb->s_flags & MS_RDONLY) {
Vyacheslav Dubeyko8c26c4e2013-04-30 15:27:48 -0700196 /*
197 * It means that filesystem was remounted in read-only
198 * mode because of error or metadata corruption. But we
199 * have dirty pages that try to be flushed in background.
200 * So, here we simply discard this dirty page.
201 */
202 nilfs_clear_dirty_page(page, false);
203 unlock_page(page);
204 return -EROFS;
205 }
206
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700207 redirty_page_for_writepage(wbc, page);
208 unlock_page(page);
209
210 if (wbc->sync_mode == WB_SYNC_ALL) {
211 err = nilfs_construct_segment(inode->i_sb);
212 if (unlikely(err))
213 return err;
214 } else if (wbc->for_reclaim)
215 nilfs_flush_segment(inode->i_sb, inode->i_ino);
216
217 return 0;
218}
219
220static int nilfs_set_page_dirty(struct page *page)
221{
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 Konishi05fe58f2009-04-06 19:01:32 -0700225 struct inode *inode = page->mapping->host;
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700226 unsigned nr_dirty = 0;
227 struct buffer_head *bh, *head;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700228
Ryusuke Konishi136e8772013-05-24 15:55:29 -0700229 /*
230 * This page is locked by callers, and no other thread
231 * concurrently marks its buffers dirty since they are
232 * only dirtied through routines in fs/buffer.c in
233 * which call sites of mark_buffer_dirty are protected
234 * by page lock.
235 */
236 bh = head = page_buffers(page);
237 do {
238 /* Do not mark hole blocks dirty */
239 if (buffer_dirty(bh) || !buffer_mapped(bh))
240 continue;
241
242 set_buffer_dirty(bh);
243 nr_dirty++;
244 } while (bh = bh->b_this_page, bh != head);
245
246 if (nr_dirty)
247 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700248 }
249 return ret;
250}
251
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100252void nilfs_write_failed(struct address_space *mapping, loff_t to)
253{
254 struct inode *inode = mapping->host;
255
256 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700257 truncate_pagecache(inode, inode->i_size);
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100258 nilfs_truncate(inode);
259 }
260}
261
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700262static int nilfs_write_begin(struct file *file, struct address_space *mapping,
263 loff_t pos, unsigned len, unsigned flags,
264 struct page **pagep, void **fsdata)
265
266{
267 struct inode *inode = mapping->host;
268 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
269
270 if (unlikely(err))
271 return err;
272
Christoph Hellwig155130a2010-06-04 11:29:58 +0200273 err = block_write_begin(mapping, pos, len, flags, pagep,
274 nilfs_get_block);
275 if (unlikely(err)) {
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100276 nilfs_write_failed(mapping, pos + len);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700277 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200278 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700279 return err;
280}
281
282static int nilfs_write_end(struct file *file, struct address_space *mapping,
283 loff_t pos, unsigned len, unsigned copied,
284 struct page *page, void *fsdata)
285{
286 struct inode *inode = mapping->host;
287 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
288 unsigned nr_dirty;
289 int err;
290
291 nr_dirty = nilfs_page_count_clean_buffers(page, start,
292 start + copied);
293 copied = generic_write_end(file, mapping, pos, len, copied, page,
294 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900295 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700296 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700297 return err ? : copied;
298}
299
300static ssize_t
301nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
302 loff_t offset, unsigned long nr_segs)
303{
304 struct file *file = iocb->ki_filp;
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100305 struct address_space *mapping = file->f_mapping;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700306 struct inode *inode = file->f_mapping->host;
307 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700308
309 if (rw == WRITE)
310 return 0;
311
312 /* Needs synchronization with the cleaner */
Christoph Hellwigaacfc19c2011-06-24 14:29:47 -0400313 size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
314 nilfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200315
316 /*
317 * In case of error extending write may have instantiated a few
318 * blocks outside i_size. Trim these off again.
319 */
320 if (unlikely((rw & WRITE) && size < 0)) {
321 loff_t isize = i_size_read(inode);
322 loff_t end = offset + iov_length(iov, nr_segs);
323
324 if (end > isize)
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100325 nilfs_write_failed(mapping, end);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200326 }
327
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700328 return size;
329}
330
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700331const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700332 .writepage = nilfs_writepage,
333 .readpage = nilfs_readpage,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700334 .writepages = nilfs_writepages,
335 .set_page_dirty = nilfs_set_page_dirty,
336 .readpages = nilfs_readpages,
337 .write_begin = nilfs_write_begin,
338 .write_end = nilfs_write_end,
339 /* .releasepage = nilfs_releasepage, */
340 .invalidatepage = block_invalidatepage,
341 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900342 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700343};
344
Al Viroc6e49e32011-07-26 03:07:14 -0400345struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700346{
347 struct super_block *sb = dir->i_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900348 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700349 struct inode *inode;
350 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900351 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700352 int err = -ENOMEM;
353 ino_t ino;
354
355 inode = new_inode(sb);
356 if (unlikely(!inode))
357 goto failed;
358
359 mapping_set_gfp_mask(inode->i_mapping,
360 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
361
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900362 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700363 ii = NILFS_I(inode);
364 ii->i_state = 1 << NILFS_I_NEW;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900365 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700366
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900367 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700368 if (unlikely(err))
369 goto failed_ifile_create_inode;
370 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
371
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700372 atomic64_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300373 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700374 inode->i_ino = ino;
375 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
376
377 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
378 err = nilfs_bmap_read(ii->i_bmap, NULL);
379 if (err < 0)
380 goto failed_bmap;
381
382 set_bit(NILFS_I_BMAP, &ii->i_state);
383 /* No lock is needed; iget() ensures it. */
384 }
385
Ryusuke Konishib253a3e2011-01-20 02:09:53 +0900386 ii->i_flags = nilfs_mask_flags(
387 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700388
389 /* ii->i_file_acl = 0; */
390 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700391 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700392 nilfs_set_inode_flags(inode);
Ryusuke Konishi9b1fc4e42011-03-09 11:05:08 +0900393 spin_lock(&nilfs->ns_next_gen_lock);
394 inode->i_generation = nilfs->ns_next_generation++;
395 spin_unlock(&nilfs->ns_next_gen_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700396 insert_inode_hash(inode);
397
398 err = nilfs_init_acl(inode, dir);
399 if (unlikely(err))
400 goto failed_acl; /* never occur. When supporting
401 nilfs_init_acl(), proper cancellation of
402 above jobs should be considered */
403
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700404 return inode;
405
406 failed_acl:
407 failed_bmap:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200408 clear_nlink(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700409 iput(inode); /* raw_inode will be deleted through
410 generic_delete_inode() */
411 goto failed;
412
413 failed_ifile_create_inode:
414 make_bad_inode(inode);
415 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
416 called */
417 failed:
418 return ERR_PTR(err);
419}
420
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700421void nilfs_set_inode_flags(struct inode *inode)
422{
423 unsigned int flags = NILFS_I(inode)->i_flags;
424
425 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
426 S_DIRSYNC);
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900427 if (flags & FS_SYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700428 inode->i_flags |= S_SYNC;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900429 if (flags & FS_APPEND_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700430 inode->i_flags |= S_APPEND;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900431 if (flags & FS_IMMUTABLE_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700432 inode->i_flags |= S_IMMUTABLE;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900433 if (flags & FS_NOATIME_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700434 inode->i_flags |= S_NOATIME;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900435 if (flags & FS_DIRSYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700436 inode->i_flags |= S_DIRSYNC;
437 mapping_set_gfp_mask(inode->i_mapping,
438 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
439}
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);
458 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700459 return -EINVAL; /* this inode is deleted */
460
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;
512 inode->i_mapping->a_ops = &nilfs_aops;
513 } else {
514 inode->i_op = &nilfs_special_inode_operations;
515 init_special_inode(
516 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900517 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700518 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900519 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700520 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900521 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700522 nilfs_set_inode_flags(inode);
523 return 0;
524
525 failed_unmap:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900526 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700527 brelse(bh);
528
529 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900530 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700531 return err;
532}
533
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900534static int nilfs_iget_test(struct inode *inode, void *opaque)
535{
536 struct nilfs_iget_args *args = opaque;
537 struct nilfs_inode_info *ii;
538
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900539 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900540 return 0;
541
542 ii = NILFS_I(inode);
543 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
544 return !args->for_gc;
545
546 return args->for_gc && args->cno == ii->i_cno;
547}
548
549static int nilfs_iget_set(struct inode *inode, void *opaque)
550{
551 struct nilfs_iget_args *args = opaque;
552
553 inode->i_ino = args->ino;
554 if (args->for_gc) {
555 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
556 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900557 NILFS_I(inode)->i_root = NULL;
558 } else {
559 if (args->root && args->ino == NILFS_ROOT_INO)
560 nilfs_get_root(args->root);
561 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900562 }
563 return 0;
564}
565
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900566struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
567 unsigned long ino)
568{
569 struct nilfs_iget_args args = {
570 .ino = ino, .root = root, .cno = 0, .for_gc = 0
571 };
572
573 return ilookup5(sb, ino, nilfs_iget_test, &args);
574}
575
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900576struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
577 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700578{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900579 struct nilfs_iget_args args = {
580 .ino = ino, .root = root, .cno = 0, .for_gc = 0
581 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900582
583 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
584}
585
586struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
587 unsigned long ino)
588{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700589 struct inode *inode;
590 int err;
591
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900592 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700593 if (unlikely(!inode))
594 return ERR_PTR(-ENOMEM);
595 if (!(inode->i_state & I_NEW))
596 return inode;
597
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900598 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700599 if (unlikely(err)) {
600 iget_failed(inode);
601 return ERR_PTR(err);
602 }
603 unlock_new_inode(inode);
604 return inode;
605}
606
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900607struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
608 __u64 cno)
609{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900610 struct nilfs_iget_args args = {
611 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
612 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900613 struct inode *inode;
614 int err;
615
616 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
617 if (unlikely(!inode))
618 return ERR_PTR(-ENOMEM);
619 if (!(inode->i_state & I_NEW))
620 return inode;
621
622 err = nilfs_init_gcinode(inode);
623 if (unlikely(err)) {
624 iget_failed(inode);
625 return ERR_PTR(err);
626 }
627 unlock_new_inode(inode);
628 return inode;
629}
630
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700631void nilfs_write_inode_common(struct inode *inode,
632 struct nilfs_inode *raw_inode, int has_bmap)
633{
634 struct nilfs_inode_info *ii = NILFS_I(inode);
635
636 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
Eric W. Biederman305d3d02012-02-10 12:31:23 -0800637 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
638 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700639 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
640 raw_inode->i_size = cpu_to_le64(inode->i_size);
641 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
642 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700643 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
644 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700645 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
646
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700647 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
648 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
649
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900650 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
651 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
652
653 /* zero-fill unused portion in the case of super root block */
654 raw_inode->i_xattr = 0;
655 raw_inode->i_pad = 0;
656 memset((void *)raw_inode + sizeof(*raw_inode), 0,
657 nilfs->ns_inode_size - sizeof(*raw_inode));
658 }
659
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700660 if (has_bmap)
661 nilfs_bmap_write(ii->i_bmap, raw_inode);
662 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
663 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900664 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700665 /* When extending inode, nilfs->ns_inode_size should be checked
666 for substitutions of appended fields */
667}
668
669void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
670{
671 ino_t ino = inode->i_ino;
672 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900673 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700674 struct nilfs_inode *raw_inode;
675
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900676 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700677
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700678 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900679 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700680 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
681
682 nilfs_write_inode_common(inode, raw_inode, 0);
683 /* XXX: call with has_bmap = 0 is a workaround to avoid
684 deadlock of bmap. This delays update of i_bmap to just
685 before writing */
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900686 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700687}
688
689#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
690
691static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
692 unsigned long from)
693{
694 unsigned long b;
695 int ret;
696
697 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
698 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900699repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700700 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
701 if (ret == -ENOENT)
702 return;
703 else if (ret < 0)
704 goto failed;
705
706 if (b < from)
707 return;
708
709 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
710 ret = nilfs_bmap_truncate(ii->i_bmap, b);
711 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
712 if (!ret || (ret == -ENOMEM &&
713 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
714 goto repeat;
715
Ryusuke Konishie8289492010-11-19 15:26:20 +0900716failed:
717 nilfs_warning(ii->vfs_inode.i_sb, __func__,
718 "failed to truncate bmap (ino=%lu, err=%d)",
719 ii->vfs_inode.i_ino, ret);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700720}
721
722void nilfs_truncate(struct inode *inode)
723{
724 unsigned long blkoff;
725 unsigned int blocksize;
726 struct nilfs_transaction_info ti;
727 struct super_block *sb = inode->i_sb;
728 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700729
730 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
731 return;
732 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
733 return;
734
735 blocksize = sb->s_blocksize;
736 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700737 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700738
739 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
740
741 nilfs_truncate_bmap(ii, blkoff);
742
743 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
744 if (IS_SYNC(inode))
745 nilfs_set_transaction_flag(NILFS_TI_SYNC);
746
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900747 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900748 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700749 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700750 /* May construct a logical segment and may fail in sync mode.
751 But truncate has no return value. */
752}
753
Al Viro6fd1e5c2010-06-07 11:55:00 -0400754static void nilfs_clear_inode(struct inode *inode)
755{
756 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900757 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400758
759 /*
760 * Free resources allocated in nilfs_read_inode(), here.
761 */
762 BUG_ON(!list_empty(&ii->i_dirty));
763 brelse(ii->i_bh);
764 ii->i_bh = NULL;
765
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900766 if (mdi && mdi->mi_palloc_cache)
767 nilfs_palloc_destroy_cache(inode);
768
Al Viro6fd1e5c2010-06-07 11:55:00 -0400769 if (test_bit(NILFS_I_BMAP, &ii->i_state))
770 nilfs_bmap_clear(ii->i_bmap);
771
772 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900773
774 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
775 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400776}
777
778void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700779{
780 struct nilfs_transaction_info ti;
781 struct super_block *sb = inode->i_sb;
782 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900783 int ret;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700784
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900785 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700786 if (inode->i_data.nrpages)
787 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200788 clear_inode(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400789 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700790 return;
791 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700792 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
793
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700794 if (inode->i_data.nrpages)
795 truncate_inode_pages(&inode->i_data, 0);
796
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900797 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700798 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900799 nilfs_mark_inode_dirty(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200800 clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900801
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900802 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
803 if (!ret)
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700804 atomic64_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900805
Al Viro6fd1e5c2010-06-07 11:55:00 -0400806 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900807
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700808 if (IS_SYNC(inode))
809 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700810 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700811 /* May construct a logical segment and may fail in sync mode.
812 But delete_inode has no return value. */
813}
814
815int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
816{
817 struct nilfs_transaction_info ti;
818 struct inode *inode = dentry->d_inode;
819 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700820 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700821
822 err = inode_change_ok(inode, iattr);
823 if (err)
824 return err;
825
826 err = nilfs_transaction_begin(sb, &ti, 0);
827 if (unlikely(err))
828 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700829
Christoph Hellwig10257742010-06-04 11:30:02 +0200830 if ((iattr->ia_valid & ATTR_SIZE) &&
831 iattr->ia_size != i_size_read(inode)) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400832 inode_dio_wait(inode);
Marco Stornelli2d1b3992012-12-15 11:57:37 +0100833 truncate_setsize(inode, iattr->ia_size);
834 nilfs_truncate(inode);
Christoph Hellwig10257742010-06-04 11:30:02 +0200835 }
836
837 setattr_copy(inode, iattr);
838 mark_inode_dirty(inode);
839
840 if (iattr->ia_valid & ATTR_MODE) {
841 err = nilfs_acl_chmod(inode);
842 if (unlikely(err))
843 goto out_err;
844 }
845
846 return nilfs_transaction_commit(sb);
847
848out_err:
849 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700850 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700851}
852
Al Viro10556cb2011-06-20 19:28:19 -0400853int nilfs_permission(struct inode *inode, int mask)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900854{
Al Viro730e9082011-06-18 20:21:44 -0400855 struct nilfs_root *root = NILFS_I(inode)->i_root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900856 if ((mask & MAY_WRITE) && root &&
857 root->cno != NILFS_CPTREE_CURRENT_CNO)
858 return -EROFS; /* snapshot is not writable */
859
Al Viro2830ba72011-06-20 19:16:29 -0400860 return generic_permission(inode, mask);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900861}
862
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900863int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700864{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900865 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700866 struct nilfs_inode_info *ii = NILFS_I(inode);
867 int err;
868
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900869 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700870 if (ii->i_bh == NULL) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900871 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900872 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
873 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700874 if (unlikely(err))
875 return err;
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900876 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700877 if (ii->i_bh == NULL)
878 ii->i_bh = *pbh;
879 else {
880 brelse(*pbh);
881 *pbh = ii->i_bh;
882 }
883 } else
884 *pbh = ii->i_bh;
885
886 get_bh(*pbh);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900887 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700888 return 0;
889}
890
891int nilfs_inode_dirty(struct inode *inode)
892{
893 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900894 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700895 int ret = 0;
896
897 if (!list_empty(&ii->i_dirty)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900898 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700899 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
900 test_bit(NILFS_I_BUSY, &ii->i_state);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900901 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700902 }
903 return ret;
904}
905
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900906int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700907{
908 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900909 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700910
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900911 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700912
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700913 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700914 return 0;
915
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900916 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700917 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
918 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
919 /* Because this routine may race with nilfs_dispose_list(),
920 we have to check NILFS_I_QUEUED here, too. */
921 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
922 /* This will happen when somebody is freeing
923 this inode. */
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900924 nilfs_warning(inode->i_sb, __func__,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700925 "cannot get inode (ino=%lu)\n",
926 inode->i_ino);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900927 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700928 return -EINVAL; /* NILFS_I_DIRTY may remain for
929 freeing inode */
930 }
Nicolas Kaisereaae0f32011-03-19 16:45:30 +0100931 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700932 set_bit(NILFS_I_QUEUED, &ii->i_state);
933 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900934 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700935 return 0;
936}
937
938int nilfs_mark_inode_dirty(struct inode *inode)
939{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700940 struct buffer_head *ibh;
941 int err;
942
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900943 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700944 if (unlikely(err)) {
945 nilfs_warning(inode->i_sb, __func__,
946 "failed to reget inode block.\n");
947 return err;
948 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700949 nilfs_update_inode(inode, ibh);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900950 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900951 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700952 brelse(ibh);
953 return 0;
954}
955
956/**
957 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
958 * @inode: inode of the file to be registered.
959 *
960 * nilfs_dirty_inode() loads a inode block containing the specified
961 * @inode and copies data from a nilfs_inode to a corresponding inode
962 * entry in the inode block. This operation is excluded from the segment
963 * construction. This function can be called both as a single operation
964 * and as a part of indivisible file operations.
965 */
Christoph Hellwigaa385722011-05-27 06:53:02 -0400966void nilfs_dirty_inode(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700967{
968 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900969 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700970
971 if (is_bad_inode(inode)) {
972 nilfs_warning(inode->i_sb, __func__,
973 "tried to mark bad_inode dirty. ignored.\n");
974 dump_stack();
975 return;
976 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900977 if (mdi) {
978 nilfs_mdt_mark_dirty(inode);
979 return;
980 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700981 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700982 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700983 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700984}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900985
986int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
987 __u64 start, __u64 len)
988{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900989 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900990 __u64 logical = 0, phys = 0, size = 0;
991 __u32 flags = 0;
992 loff_t isize;
993 sector_t blkoff, end_blkoff;
994 sector_t delalloc_blkoff;
995 unsigned long delalloc_blklen;
996 unsigned int blkbits = inode->i_blkbits;
997 int ret, n;
998
999 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1000 if (ret)
1001 return ret;
1002
1003 mutex_lock(&inode->i_mutex);
1004
1005 isize = i_size_read(inode);
1006
1007 blkoff = start >> blkbits;
1008 end_blkoff = (start + len - 1) >> blkbits;
1009
1010 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1011 &delalloc_blkoff);
1012
1013 do {
1014 __u64 blkphy;
1015 unsigned int maxblocks;
1016
1017 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1018 if (size) {
1019 /* End of the current extent */
1020 ret = fiemap_fill_next_extent(
1021 fieinfo, logical, phys, size, flags);
1022 if (ret)
1023 break;
1024 }
1025 if (blkoff > end_blkoff)
1026 break;
1027
1028 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1029 logical = blkoff << blkbits;
1030 phys = 0;
1031 size = delalloc_blklen << blkbits;
1032
1033 blkoff = delalloc_blkoff + delalloc_blklen;
1034 delalloc_blklen = nilfs_find_uncommitted_extent(
1035 inode, blkoff, &delalloc_blkoff);
1036 continue;
1037 }
1038
1039 /*
1040 * Limit the number of blocks that we look up so as
1041 * not to get into the next delayed allocation extent.
1042 */
1043 maxblocks = INT_MAX;
1044 if (delalloc_blklen)
1045 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1046 maxblocks);
1047 blkphy = 0;
1048
1049 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1050 n = nilfs_bmap_lookup_contig(
1051 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1052 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1053
1054 if (n < 0) {
1055 int past_eof;
1056
1057 if (unlikely(n != -ENOENT))
1058 break; /* error */
1059
1060 /* HOLE */
1061 blkoff++;
1062 past_eof = ((blkoff << blkbits) >= isize);
1063
1064 if (size) {
1065 /* End of the current extent */
1066
1067 if (past_eof)
1068 flags |= FIEMAP_EXTENT_LAST;
1069
1070 ret = fiemap_fill_next_extent(
1071 fieinfo, logical, phys, size, flags);
1072 if (ret)
1073 break;
1074 size = 0;
1075 }
1076 if (blkoff > end_blkoff || past_eof)
1077 break;
1078 } else {
1079 if (size) {
1080 if (phys && blkphy << blkbits == phys + size) {
1081 /* The current extent goes on */
1082 size += n << blkbits;
1083 } else {
1084 /* Terminate the current extent */
1085 ret = fiemap_fill_next_extent(
1086 fieinfo, logical, phys, size,
1087 flags);
1088 if (ret || blkoff > end_blkoff)
1089 break;
1090
1091 /* Start another extent */
1092 flags = FIEMAP_EXTENT_MERGED;
1093 logical = blkoff << blkbits;
1094 phys = blkphy << blkbits;
1095 size = n << blkbits;
1096 }
1097 } else {
1098 /* Start a new extent */
1099 flags = FIEMAP_EXTENT_MERGED;
1100 logical = blkoff << blkbits;
1101 phys = blkphy << blkbits;
1102 size = n << blkbits;
1103 }
1104 blkoff += n;
1105 }
1106 cond_resched();
1107 } while (true);
1108
1109 /* If ret is 1 then we just hit the end of the extent array */
1110 if (ret == 1)
1111 ret = 0;
1112
1113 mutex_unlock(&inode->i_mutex);
1114 return ret;
1115}