blob: 8f7b95ac1f7e438ffe8de2bab81b3b8c40d1eeb9 [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
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090037struct nilfs_iget_args {
38 u64 ino;
39 __u64 cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +090040 struct nilfs_root *root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090041 int for_gc;
42};
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070043
Ryusuke Konishibe667372011-03-05 00:19:32 +090044void nilfs_inode_add_blocks(struct inode *inode, int n)
45{
46 struct nilfs_root *root = NILFS_I(inode)->i_root;
47
48 inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
49 if (root)
50 atomic_add(n, &root->blocks_count);
51}
52
53void nilfs_inode_sub_blocks(struct inode *inode, int n)
54{
55 struct nilfs_root *root = NILFS_I(inode)->i_root;
56
57 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
58 if (root)
59 atomic_sub(n, &root->blocks_count);
60}
61
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070062/**
63 * nilfs_get_block() - get a file block on the filesystem (callback function)
64 * @inode - inode struct of the target file
65 * @blkoff - file block number
66 * @bh_result - buffer head to be mapped on
67 * @create - indicate whether allocating the block or not when it has not
68 * been allocated yet.
69 *
70 * This function does not issue actual read request of the specified data
71 * block. It is done by VFS.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070072 */
73int nilfs_get_block(struct inode *inode, sector_t blkoff,
74 struct buffer_head *bh_result, int create)
75{
76 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090077 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090078 __u64 blknum = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070079 int err = 0, ret;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090080 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070081
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090082 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090083 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +090084 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090085 if (ret >= 0) { /* found */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070086 map_bh(bh_result, inode->i_sb, blknum);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090087 if (ret > 0)
88 bh_result->b_size = (ret << inode->i_blkbits);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070089 goto out;
90 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070091 /* data block was not found */
92 if (ret == -ENOENT && create) {
93 struct nilfs_transaction_info ti;
94
95 bh_result->b_blocknr = 0;
96 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
97 if (unlikely(err))
98 goto out;
99 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
100 (unsigned long)bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700101 if (unlikely(err != 0)) {
102 if (err == -EEXIST) {
103 /*
104 * The get_block() function could be called
105 * from multiple callers for an inode.
106 * However, the page having this block must
107 * be locked in this case.
108 */
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700109 printk(KERN_WARNING
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700110 "nilfs_get_block: a race condition "
111 "while inserting a data block. "
112 "(inode number=%lu, file block "
113 "offset=%llu)\n",
114 inode->i_ino,
115 (unsigned long long)blkoff);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700116 err = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700117 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700118 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700119 goto out;
120 }
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900121 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700122 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700123 /* Error handling should be detailed */
124 set_buffer_new(bh_result);
Ryusuke Konishi27e6c7a2010-12-26 16:28:28 +0900125 set_buffer_delay(bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700126 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
127 to proper value */
128 } else if (ret == -ENOENT) {
129 /* not found is not error (e.g. hole); must return without
130 the mapped state flag. */
131 ;
132 } else {
133 err = ret;
134 }
135
136 out:
137 return err;
138}
139
140/**
141 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
142 * address_space_operations.
143 * @file - file struct of the file to be read
144 * @page - the page to be read
145 */
146static int nilfs_readpage(struct file *file, struct page *page)
147{
148 return mpage_readpage(page, nilfs_get_block);
149}
150
151/**
152 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
153 * address_space_operations.
154 * @file - file struct of the file to be read
155 * @mapping - address_space struct used for reading multiple pages
156 * @pages - the pages to be read
157 * @nr_pages - number of pages to be read
158 */
159static int nilfs_readpages(struct file *file, struct address_space *mapping,
160 struct list_head *pages, unsigned nr_pages)
161{
162 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
163}
164
165static int nilfs_writepages(struct address_space *mapping,
166 struct writeback_control *wbc)
167{
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700168 struct inode *inode = mapping->host;
169 int err = 0;
170
171 if (wbc->sync_mode == WB_SYNC_ALL)
172 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
173 wbc->range_start,
174 wbc->range_end);
175 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700176}
177
178static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
179{
180 struct inode *inode = page->mapping->host;
181 int err;
182
183 redirty_page_for_writepage(wbc, page);
184 unlock_page(page);
185
186 if (wbc->sync_mode == WB_SYNC_ALL) {
187 err = nilfs_construct_segment(inode->i_sb);
188 if (unlikely(err))
189 return err;
190 } else if (wbc->for_reclaim)
191 nilfs_flush_segment(inode->i_sb, inode->i_ino);
192
193 return 0;
194}
195
196static int nilfs_set_page_dirty(struct page *page)
197{
198 int ret = __set_page_dirty_buffers(page);
199
200 if (ret) {
201 struct inode *inode = page->mapping->host;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700202 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
203
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900204 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700205 }
206 return ret;
207}
208
209static int nilfs_write_begin(struct file *file, struct address_space *mapping,
210 loff_t pos, unsigned len, unsigned flags,
211 struct page **pagep, void **fsdata)
212
213{
214 struct inode *inode = mapping->host;
215 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
216
217 if (unlikely(err))
218 return err;
219
Christoph Hellwig155130a2010-06-04 11:29:58 +0200220 err = block_write_begin(mapping, pos, len, flags, pagep,
221 nilfs_get_block);
222 if (unlikely(err)) {
223 loff_t isize = mapping->host->i_size;
224 if (pos + len > isize)
225 vmtruncate(mapping->host, isize);
226
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700227 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200228 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700229 return err;
230}
231
232static int nilfs_write_end(struct file *file, struct address_space *mapping,
233 loff_t pos, unsigned len, unsigned copied,
234 struct page *page, void *fsdata)
235{
236 struct inode *inode = mapping->host;
237 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
238 unsigned nr_dirty;
239 int err;
240
241 nr_dirty = nilfs_page_count_clean_buffers(page, start,
242 start + copied);
243 copied = generic_write_end(file, mapping, pos, len, copied, page,
244 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900245 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700246 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700247 return err ? : copied;
248}
249
250static ssize_t
251nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
252 loff_t offset, unsigned long nr_segs)
253{
254 struct file *file = iocb->ki_filp;
255 struct inode *inode = file->f_mapping->host;
256 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700257
258 if (rw == WRITE)
259 return 0;
260
261 /* Needs synchronization with the cleaner */
Christoph Hellwigaacfc19c2011-06-24 14:29:47 -0400262 size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
263 nilfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200264
265 /*
266 * In case of error extending write may have instantiated a few
267 * blocks outside i_size. Trim these off again.
268 */
269 if (unlikely((rw & WRITE) && size < 0)) {
270 loff_t isize = i_size_read(inode);
271 loff_t end = offset + iov_length(iov, nr_segs);
272
273 if (end > isize)
274 vmtruncate(inode, isize);
275 }
276
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700277 return size;
278}
279
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700280const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700281 .writepage = nilfs_writepage,
282 .readpage = nilfs_readpage,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700283 .writepages = nilfs_writepages,
284 .set_page_dirty = nilfs_set_page_dirty,
285 .readpages = nilfs_readpages,
286 .write_begin = nilfs_write_begin,
287 .write_end = nilfs_write_end,
288 /* .releasepage = nilfs_releasepage, */
289 .invalidatepage = block_invalidatepage,
290 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900291 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700292};
293
Al Viroc6e49e32011-07-26 03:07:14 -0400294struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700295{
296 struct super_block *sb = dir->i_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900297 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700298 struct inode *inode;
299 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900300 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700301 int err = -ENOMEM;
302 ino_t ino;
303
304 inode = new_inode(sb);
305 if (unlikely(!inode))
306 goto failed;
307
308 mapping_set_gfp_mask(inode->i_mapping,
309 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
310
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900311 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700312 ii = NILFS_I(inode);
313 ii->i_state = 1 << NILFS_I_NEW;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900314 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700315
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900316 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700317 if (unlikely(err))
318 goto failed_ifile_create_inode;
319 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
320
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900321 atomic_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300322 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700323 inode->i_ino = ino;
324 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
325
326 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
327 err = nilfs_bmap_read(ii->i_bmap, NULL);
328 if (err < 0)
329 goto failed_bmap;
330
331 set_bit(NILFS_I_BMAP, &ii->i_state);
332 /* No lock is needed; iget() ensures it. */
333 }
334
Ryusuke Konishib253a3e2011-01-20 02:09:53 +0900335 ii->i_flags = nilfs_mask_flags(
336 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700337
338 /* ii->i_file_acl = 0; */
339 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700340 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700341 nilfs_set_inode_flags(inode);
Ryusuke Konishi9b1fc4e42011-03-09 11:05:08 +0900342 spin_lock(&nilfs->ns_next_gen_lock);
343 inode->i_generation = nilfs->ns_next_generation++;
344 spin_unlock(&nilfs->ns_next_gen_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700345 insert_inode_hash(inode);
346
347 err = nilfs_init_acl(inode, dir);
348 if (unlikely(err))
349 goto failed_acl; /* never occur. When supporting
350 nilfs_init_acl(), proper cancellation of
351 above jobs should be considered */
352
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700353 return inode;
354
355 failed_acl:
356 failed_bmap:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200357 clear_nlink(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700358 iput(inode); /* raw_inode will be deleted through
359 generic_delete_inode() */
360 goto failed;
361
362 failed_ifile_create_inode:
363 make_bad_inode(inode);
364 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
365 called */
366 failed:
367 return ERR_PTR(err);
368}
369
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700370void nilfs_set_inode_flags(struct inode *inode)
371{
372 unsigned int flags = NILFS_I(inode)->i_flags;
373
374 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
375 S_DIRSYNC);
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900376 if (flags & FS_SYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700377 inode->i_flags |= S_SYNC;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900378 if (flags & FS_APPEND_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700379 inode->i_flags |= S_APPEND;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900380 if (flags & FS_IMMUTABLE_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700381 inode->i_flags |= S_IMMUTABLE;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900382 if (flags & FS_NOATIME_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700383 inode->i_flags |= S_NOATIME;
Ryusuke Konishif0c9f242011-01-20 02:09:52 +0900384 if (flags & FS_DIRSYNC_FL)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700385 inode->i_flags |= S_DIRSYNC;
386 mapping_set_gfp_mask(inode->i_mapping,
387 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
388}
389
390int nilfs_read_inode_common(struct inode *inode,
391 struct nilfs_inode *raw_inode)
392{
393 struct nilfs_inode_info *ii = NILFS_I(inode);
394 int err;
395
396 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
397 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
398 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200399 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700400 inode->i_size = le64_to_cpu(raw_inode->i_size);
401 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
402 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
403 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700404 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
405 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
406 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
407 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700408 return -EINVAL; /* this inode is deleted */
409
410 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
411 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
412#if 0
413 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
414 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
415 0 : le32_to_cpu(raw_inode->i_dir_acl);
416#endif
Ryusuke Konishi3cc811b2009-09-28 13:02:46 +0900417 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700418 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
419
420 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
421 S_ISLNK(inode->i_mode)) {
422 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
423 if (err < 0)
424 return err;
425 set_bit(NILFS_I_BMAP, &ii->i_state);
426 /* No lock is needed; iget() ensures it. */
427 }
428 return 0;
429}
430
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900431static int __nilfs_read_inode(struct super_block *sb,
432 struct nilfs_root *root, unsigned long ino,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700433 struct inode *inode)
434{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900435 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700436 struct buffer_head *bh;
437 struct nilfs_inode *raw_inode;
438 int err;
439
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900440 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900441 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700442 if (unlikely(err))
443 goto bad_inode;
444
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900445 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700446
Ryusuke Konishi1b2f5a62009-08-22 19:10:07 +0900447 err = nilfs_read_inode_common(inode, raw_inode);
448 if (err)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700449 goto failed_unmap;
450
451 if (S_ISREG(inode->i_mode)) {
452 inode->i_op = &nilfs_file_inode_operations;
453 inode->i_fop = &nilfs_file_operations;
454 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700455 } else if (S_ISDIR(inode->i_mode)) {
456 inode->i_op = &nilfs_dir_inode_operations;
457 inode->i_fop = &nilfs_dir_operations;
458 inode->i_mapping->a_ops = &nilfs_aops;
459 } else if (S_ISLNK(inode->i_mode)) {
460 inode->i_op = &nilfs_symlink_inode_operations;
461 inode->i_mapping->a_ops = &nilfs_aops;
462 } else {
463 inode->i_op = &nilfs_special_inode_operations;
464 init_special_inode(
465 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900466 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700467 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900468 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700469 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900470 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700471 nilfs_set_inode_flags(inode);
472 return 0;
473
474 failed_unmap:
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);
477
478 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900479 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700480 return err;
481}
482
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900483static int nilfs_iget_test(struct inode *inode, void *opaque)
484{
485 struct nilfs_iget_args *args = opaque;
486 struct nilfs_inode_info *ii;
487
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900488 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900489 return 0;
490
491 ii = NILFS_I(inode);
492 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
493 return !args->for_gc;
494
495 return args->for_gc && args->cno == ii->i_cno;
496}
497
498static int nilfs_iget_set(struct inode *inode, void *opaque)
499{
500 struct nilfs_iget_args *args = opaque;
501
502 inode->i_ino = args->ino;
503 if (args->for_gc) {
504 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
505 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900506 NILFS_I(inode)->i_root = NULL;
507 } else {
508 if (args->root && args->ino == NILFS_ROOT_INO)
509 nilfs_get_root(args->root);
510 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900511 }
512 return 0;
513}
514
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900515struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
516 unsigned long ino)
517{
518 struct nilfs_iget_args args = {
519 .ino = ino, .root = root, .cno = 0, .for_gc = 0
520 };
521
522 return ilookup5(sb, ino, nilfs_iget_test, &args);
523}
524
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900525struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
526 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700527{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900528 struct nilfs_iget_args args = {
529 .ino = ino, .root = root, .cno = 0, .for_gc = 0
530 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900531
532 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
533}
534
535struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
536 unsigned long ino)
537{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700538 struct inode *inode;
539 int err;
540
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900541 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700542 if (unlikely(!inode))
543 return ERR_PTR(-ENOMEM);
544 if (!(inode->i_state & I_NEW))
545 return inode;
546
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900547 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700548 if (unlikely(err)) {
549 iget_failed(inode);
550 return ERR_PTR(err);
551 }
552 unlock_new_inode(inode);
553 return inode;
554}
555
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900556struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
557 __u64 cno)
558{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900559 struct nilfs_iget_args args = {
560 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
561 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900562 struct inode *inode;
563 int err;
564
565 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
566 if (unlikely(!inode))
567 return ERR_PTR(-ENOMEM);
568 if (!(inode->i_state & I_NEW))
569 return inode;
570
571 err = nilfs_init_gcinode(inode);
572 if (unlikely(err)) {
573 iget_failed(inode);
574 return ERR_PTR(err);
575 }
576 unlock_new_inode(inode);
577 return inode;
578}
579
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700580void nilfs_write_inode_common(struct inode *inode,
581 struct nilfs_inode *raw_inode, int has_bmap)
582{
583 struct nilfs_inode_info *ii = NILFS_I(inode);
584
585 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
586 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
587 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
588 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
589 raw_inode->i_size = cpu_to_le64(inode->i_size);
590 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
591 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700592 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
593 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700594 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
595
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700596 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
597 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
598
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900599 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
600 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
601
602 /* zero-fill unused portion in the case of super root block */
603 raw_inode->i_xattr = 0;
604 raw_inode->i_pad = 0;
605 memset((void *)raw_inode + sizeof(*raw_inode), 0,
606 nilfs->ns_inode_size - sizeof(*raw_inode));
607 }
608
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700609 if (has_bmap)
610 nilfs_bmap_write(ii->i_bmap, raw_inode);
611 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
612 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900613 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700614 /* When extending inode, nilfs->ns_inode_size should be checked
615 for substitutions of appended fields */
616}
617
618void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
619{
620 ino_t ino = inode->i_ino;
621 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900622 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700623 struct nilfs_inode *raw_inode;
624
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900625 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700626
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700627 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900628 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700629 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
630
631 nilfs_write_inode_common(inode, raw_inode, 0);
632 /* XXX: call with has_bmap = 0 is a workaround to avoid
633 deadlock of bmap. This delays update of i_bmap to just
634 before writing */
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900635 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700636}
637
638#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
639
640static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
641 unsigned long from)
642{
643 unsigned long b;
644 int ret;
645
646 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
647 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900648repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700649 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
650 if (ret == -ENOENT)
651 return;
652 else if (ret < 0)
653 goto failed;
654
655 if (b < from)
656 return;
657
658 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
659 ret = nilfs_bmap_truncate(ii->i_bmap, b);
660 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
661 if (!ret || (ret == -ENOMEM &&
662 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
663 goto repeat;
664
Ryusuke Konishie8289492010-11-19 15:26:20 +0900665failed:
666 nilfs_warning(ii->vfs_inode.i_sb, __func__,
667 "failed to truncate bmap (ino=%lu, err=%d)",
668 ii->vfs_inode.i_ino, ret);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700669}
670
671void nilfs_truncate(struct inode *inode)
672{
673 unsigned long blkoff;
674 unsigned int blocksize;
675 struct nilfs_transaction_info ti;
676 struct super_block *sb = inode->i_sb;
677 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700678
679 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
680 return;
681 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
682 return;
683
684 blocksize = sb->s_blocksize;
685 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700686 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700687
688 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
689
690 nilfs_truncate_bmap(ii, blkoff);
691
692 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
693 if (IS_SYNC(inode))
694 nilfs_set_transaction_flag(NILFS_TI_SYNC);
695
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900696 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900697 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700698 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700699 /* May construct a logical segment and may fail in sync mode.
700 But truncate has no return value. */
701}
702
Al Viro6fd1e5c2010-06-07 11:55:00 -0400703static void nilfs_clear_inode(struct inode *inode)
704{
705 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900706 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400707
708 /*
709 * Free resources allocated in nilfs_read_inode(), here.
710 */
711 BUG_ON(!list_empty(&ii->i_dirty));
712 brelse(ii->i_bh);
713 ii->i_bh = NULL;
714
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900715 if (mdi && mdi->mi_palloc_cache)
716 nilfs_palloc_destroy_cache(inode);
717
Al Viro6fd1e5c2010-06-07 11:55:00 -0400718 if (test_bit(NILFS_I_BMAP, &ii->i_state))
719 nilfs_bmap_clear(ii->i_bmap);
720
721 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900722
723 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
724 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400725}
726
727void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700728{
729 struct nilfs_transaction_info ti;
730 struct super_block *sb = inode->i_sb;
731 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900732 int ret;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700733
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900734 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700735 if (inode->i_data.nrpages)
736 truncate_inode_pages(&inode->i_data, 0);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400737 end_writeback(inode);
738 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700739 return;
740 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700741 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
742
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700743 if (inode->i_data.nrpages)
744 truncate_inode_pages(&inode->i_data, 0);
745
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900746 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700747 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900748 nilfs_mark_inode_dirty(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400749 end_writeback(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900750
Ryusuke Konishi25b18d32011-02-11 15:23:27 +0900751 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
752 if (!ret)
753 atomic_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900754
Al Viro6fd1e5c2010-06-07 11:55:00 -0400755 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900756
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700757 if (IS_SYNC(inode))
758 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700759 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700760 /* May construct a logical segment and may fail in sync mode.
761 But delete_inode has no return value. */
762}
763
764int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
765{
766 struct nilfs_transaction_info ti;
767 struct inode *inode = dentry->d_inode;
768 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700769 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700770
771 err = inode_change_ok(inode, iattr);
772 if (err)
773 return err;
774
775 err = nilfs_transaction_begin(sb, &ti, 0);
776 if (unlikely(err))
777 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700778
Christoph Hellwig10257742010-06-04 11:30:02 +0200779 if ((iattr->ia_valid & ATTR_SIZE) &&
780 iattr->ia_size != i_size_read(inode)) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400781 inode_dio_wait(inode);
782
Christoph Hellwig10257742010-06-04 11:30:02 +0200783 err = vmtruncate(inode, iattr->ia_size);
784 if (unlikely(err))
785 goto out_err;
786 }
787
788 setattr_copy(inode, iattr);
789 mark_inode_dirty(inode);
790
791 if (iattr->ia_valid & ATTR_MODE) {
792 err = nilfs_acl_chmod(inode);
793 if (unlikely(err))
794 goto out_err;
795 }
796
797 return nilfs_transaction_commit(sb);
798
799out_err:
800 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700801 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700802}
803
Al Viro10556cb2011-06-20 19:28:19 -0400804int nilfs_permission(struct inode *inode, int mask)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900805{
Al Viro730e9082011-06-18 20:21:44 -0400806 struct nilfs_root *root = NILFS_I(inode)->i_root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900807 if ((mask & MAY_WRITE) && root &&
808 root->cno != NILFS_CPTREE_CURRENT_CNO)
809 return -EROFS; /* snapshot is not writable */
810
Al Viro2830ba72011-06-20 19:16:29 -0400811 return generic_permission(inode, mask);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900812}
813
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900814int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700815{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900816 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700817 struct nilfs_inode_info *ii = NILFS_I(inode);
818 int err;
819
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900820 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700821 if (ii->i_bh == NULL) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900822 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900823 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
824 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700825 if (unlikely(err))
826 return err;
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)
829 ii->i_bh = *pbh;
830 else {
831 brelse(*pbh);
832 *pbh = ii->i_bh;
833 }
834 } else
835 *pbh = ii->i_bh;
836
837 get_bh(*pbh);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900838 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700839 return 0;
840}
841
842int nilfs_inode_dirty(struct inode *inode)
843{
844 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900845 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700846 int ret = 0;
847
848 if (!list_empty(&ii->i_dirty)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900849 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700850 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
851 test_bit(NILFS_I_BUSY, &ii->i_state);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900852 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700853 }
854 return ret;
855}
856
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900857int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700858{
859 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900860 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700861
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900862 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700863
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700864 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700865 return 0;
866
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900867 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700868 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
869 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
870 /* Because this routine may race with nilfs_dispose_list(),
871 we have to check NILFS_I_QUEUED here, too. */
872 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
873 /* This will happen when somebody is freeing
874 this inode. */
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900875 nilfs_warning(inode->i_sb, __func__,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700876 "cannot get inode (ino=%lu)\n",
877 inode->i_ino);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900878 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700879 return -EINVAL; /* NILFS_I_DIRTY may remain for
880 freeing inode */
881 }
Nicolas Kaisereaae0f32011-03-19 16:45:30 +0100882 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700883 set_bit(NILFS_I_QUEUED, &ii->i_state);
884 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900885 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700886 return 0;
887}
888
889int nilfs_mark_inode_dirty(struct inode *inode)
890{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700891 struct buffer_head *ibh;
892 int err;
893
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900894 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700895 if (unlikely(err)) {
896 nilfs_warning(inode->i_sb, __func__,
897 "failed to reget inode block.\n");
898 return err;
899 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700900 nilfs_update_inode(inode, ibh);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900901 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900902 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700903 brelse(ibh);
904 return 0;
905}
906
907/**
908 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
909 * @inode: inode of the file to be registered.
910 *
911 * nilfs_dirty_inode() loads a inode block containing the specified
912 * @inode and copies data from a nilfs_inode to a corresponding inode
913 * entry in the inode block. This operation is excluded from the segment
914 * construction. This function can be called both as a single operation
915 * and as a part of indivisible file operations.
916 */
Christoph Hellwigaa385722011-05-27 06:53:02 -0400917void nilfs_dirty_inode(struct inode *inode, int flags)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700918{
919 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900920 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700921
922 if (is_bad_inode(inode)) {
923 nilfs_warning(inode->i_sb, __func__,
924 "tried to mark bad_inode dirty. ignored.\n");
925 dump_stack();
926 return;
927 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900928 if (mdi) {
929 nilfs_mdt_mark_dirty(inode);
930 return;
931 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700932 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700933 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700934 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700935}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900936
937int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
938 __u64 start, __u64 len)
939{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900940 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900941 __u64 logical = 0, phys = 0, size = 0;
942 __u32 flags = 0;
943 loff_t isize;
944 sector_t blkoff, end_blkoff;
945 sector_t delalloc_blkoff;
946 unsigned long delalloc_blklen;
947 unsigned int blkbits = inode->i_blkbits;
948 int ret, n;
949
950 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
951 if (ret)
952 return ret;
953
954 mutex_lock(&inode->i_mutex);
955
956 isize = i_size_read(inode);
957
958 blkoff = start >> blkbits;
959 end_blkoff = (start + len - 1) >> blkbits;
960
961 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
962 &delalloc_blkoff);
963
964 do {
965 __u64 blkphy;
966 unsigned int maxblocks;
967
968 if (delalloc_blklen && blkoff == delalloc_blkoff) {
969 if (size) {
970 /* End of the current extent */
971 ret = fiemap_fill_next_extent(
972 fieinfo, logical, phys, size, flags);
973 if (ret)
974 break;
975 }
976 if (blkoff > end_blkoff)
977 break;
978
979 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
980 logical = blkoff << blkbits;
981 phys = 0;
982 size = delalloc_blklen << blkbits;
983
984 blkoff = delalloc_blkoff + delalloc_blklen;
985 delalloc_blklen = nilfs_find_uncommitted_extent(
986 inode, blkoff, &delalloc_blkoff);
987 continue;
988 }
989
990 /*
991 * Limit the number of blocks that we look up so as
992 * not to get into the next delayed allocation extent.
993 */
994 maxblocks = INT_MAX;
995 if (delalloc_blklen)
996 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
997 maxblocks);
998 blkphy = 0;
999
1000 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1001 n = nilfs_bmap_lookup_contig(
1002 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1003 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1004
1005 if (n < 0) {
1006 int past_eof;
1007
1008 if (unlikely(n != -ENOENT))
1009 break; /* error */
1010
1011 /* HOLE */
1012 blkoff++;
1013 past_eof = ((blkoff << blkbits) >= isize);
1014
1015 if (size) {
1016 /* End of the current extent */
1017
1018 if (past_eof)
1019 flags |= FIEMAP_EXTENT_LAST;
1020
1021 ret = fiemap_fill_next_extent(
1022 fieinfo, logical, phys, size, flags);
1023 if (ret)
1024 break;
1025 size = 0;
1026 }
1027 if (blkoff > end_blkoff || past_eof)
1028 break;
1029 } else {
1030 if (size) {
1031 if (phys && blkphy << blkbits == phys + size) {
1032 /* The current extent goes on */
1033 size += n << blkbits;
1034 } else {
1035 /* Terminate the current extent */
1036 ret = fiemap_fill_next_extent(
1037 fieinfo, logical, phys, size,
1038 flags);
1039 if (ret || blkoff > end_blkoff)
1040 break;
1041
1042 /* Start another extent */
1043 flags = FIEMAP_EXTENT_MERGED;
1044 logical = blkoff << blkbits;
1045 phys = blkphy << blkbits;
1046 size = n << blkbits;
1047 }
1048 } else {
1049 /* Start a new extent */
1050 flags = FIEMAP_EXTENT_MERGED;
1051 logical = blkoff << blkbits;
1052 phys = blkphy << blkbits;
1053 size = n << blkbits;
1054 }
1055 blkoff += n;
1056 }
1057 cond_resched();
1058 } while (true);
1059
1060 /* If ret is 1 then we just hit the end of the extent array */
1061 if (ret == 1)
1062 ret = 0;
1063
1064 mutex_unlock(&inode->i_mutex);
1065 return ret;
1066}