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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/inode.c

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  1 /*
  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>
 25 #include <linux/gfp.h>
 26 #include <linux/mpage.h>
 27 #include <linux/pagemap.h>
 28 #include <linux/writeback.h>
 29 #include <linux/uio.h>
 30 #include "nilfs.h"
 31 #include "btnode.h"
 32 #include "segment.h"
 33 #include "page.h"
 34 #include "mdt.h"
 35 #include "cpfile.h"
 36 #include "ifile.h"
 37 
 38 /**
 39  * struct nilfs_iget_args - arguments used during comparison between inodes
 40  * @ino: inode number
 41  * @cno: checkpoint number
 42  * @root: pointer on NILFS root object (mounted checkpoint)
 43  * @for_gc: inode for GC flag
 44  */
 45 struct nilfs_iget_args {
 46         u64 ino;
 47         __u64 cno;
 48         struct nilfs_root *root;
 49         int for_gc;
 50 };
 51 
 52 static int nilfs_iget_test(struct inode *inode, void *opaque);
 53 
 54 void nilfs_inode_add_blocks(struct inode *inode, int n)
 55 {
 56         struct nilfs_root *root = NILFS_I(inode)->i_root;
 57 
 58         inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
 59         if (root)
 60                 atomic64_add(n, &root->blocks_count);
 61 }
 62 
 63 void nilfs_inode_sub_blocks(struct inode *inode, int n)
 64 {
 65         struct nilfs_root *root = NILFS_I(inode)->i_root;
 66 
 67         inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
 68         if (root)
 69                 atomic64_sub(n, &root->blocks_count);
 70 }
 71 
 72 /**
 73  * nilfs_get_block() - get a file block on the filesystem (callback function)
 74  * @inode - inode struct of the target file
 75  * @blkoff - file block number
 76  * @bh_result - buffer head to be mapped on
 77  * @create - indicate whether allocating the block or not when it has not
 78  *      been allocated yet.
 79  *
 80  * This function does not issue actual read request of the specified data
 81  * block. It is done by VFS.
 82  */
 83 int nilfs_get_block(struct inode *inode, sector_t blkoff,
 84                     struct buffer_head *bh_result, int create)
 85 {
 86         struct nilfs_inode_info *ii = NILFS_I(inode);
 87         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 88         __u64 blknum = 0;
 89         int err = 0, ret;
 90         unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
 91 
 92         down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
 93         ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
 94         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
 95         if (ret >= 0) { /* found */
 96                 map_bh(bh_result, inode->i_sb, blknum);
 97                 if (ret > 0)
 98                         bh_result->b_size = (ret << inode->i_blkbits);
 99                 goto out;
100         }
101         /* data block was not found */
102         if (ret == -ENOENT && create) {
103                 struct nilfs_transaction_info ti;
104 
105                 bh_result->b_blocknr = 0;
106                 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
107                 if (unlikely(err))
108                         goto out;
109                 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
110                                         (unsigned long)bh_result);
111                 if (unlikely(err != 0)) {
112                         if (err == -EEXIST) {
113                                 /*
114                                  * The get_block() function could be called
115                                  * from multiple callers for an inode.
116                                  * However, the page having this block must
117                                  * be locked in this case.
118                                  */
119                                 printk(KERN_WARNING
120                                        "nilfs_get_block: a race condition "
121                                        "while inserting a data block. "
122                                        "(inode number=%lu, file block "
123                                        "offset=%llu)\n",
124                                        inode->i_ino,
125                                        (unsigned long long)blkoff);
126                                 err = 0;
127                         }
128                         nilfs_transaction_abort(inode->i_sb);
129                         goto out;
130                 }
131                 nilfs_mark_inode_dirty_sync(inode);
132                 nilfs_transaction_commit(inode->i_sb); /* never fails */
133                 /* Error handling should be detailed */
134                 set_buffer_new(bh_result);
135                 set_buffer_delay(bh_result);
136                 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
137                                                       to proper value */
138         } else if (ret == -ENOENT) {
139                 /* not found is not error (e.g. hole); must return without
140                    the mapped state flag. */
141                 ;
142         } else {
143                 err = ret;
144         }
145 
146  out:
147         return err;
148 }
149 
150 /**
151  * nilfs_readpage() - implement readpage() method of nilfs_aops {}
152  * address_space_operations.
153  * @file - file struct of the file to be read
154  * @page - the page to be read
155  */
156 static int nilfs_readpage(struct file *file, struct page *page)
157 {
158         return mpage_readpage(page, nilfs_get_block);
159 }
160 
161 /**
162  * nilfs_readpages() - implement readpages() method of nilfs_aops {}
163  * address_space_operations.
164  * @file - file struct of the file to be read
165  * @mapping - address_space struct used for reading multiple pages
166  * @pages - the pages to be read
167  * @nr_pages - number of pages to be read
168  */
169 static int nilfs_readpages(struct file *file, struct address_space *mapping,
170                            struct list_head *pages, unsigned nr_pages)
171 {
172         return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
173 }
174 
175 static int nilfs_writepages(struct address_space *mapping,
176                             struct writeback_control *wbc)
177 {
178         struct inode *inode = mapping->host;
179         int err = 0;
180 
181         if (inode->i_sb->s_flags & MS_RDONLY) {
182                 nilfs_clear_dirty_pages(mapping, false);
183                 return -EROFS;
184         }
185 
186         if (wbc->sync_mode == WB_SYNC_ALL)
187                 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
188                                                     wbc->range_start,
189                                                     wbc->range_end);
190         return err;
191 }
192 
193 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
194 {
195         struct inode *inode = page->mapping->host;
196         int err;
197 
198         if (inode->i_sb->s_flags & MS_RDONLY) {
199                 /*
200                  * It means that filesystem was remounted in read-only
201                  * mode because of error or metadata corruption. But we
202                  * have dirty pages that try to be flushed in background.
203                  * So, here we simply discard this dirty page.
204                  */
205                 nilfs_clear_dirty_page(page, false);
206                 unlock_page(page);
207                 return -EROFS;
208         }
209 
210         redirty_page_for_writepage(wbc, page);
211         unlock_page(page);
212 
213         if (wbc->sync_mode == WB_SYNC_ALL) {
214                 err = nilfs_construct_segment(inode->i_sb);
215                 if (unlikely(err))
216                         return err;
217         } else if (wbc->for_reclaim)
218                 nilfs_flush_segment(inode->i_sb, inode->i_ino);
219 
220         return 0;
221 }
222 
223 static int nilfs_set_page_dirty(struct page *page)
224 {
225         struct inode *inode = page->mapping->host;
226         int ret = __set_page_dirty_nobuffers(page);
227 
228         if (page_has_buffers(page)) {
229                 unsigned nr_dirty = 0;
230                 struct buffer_head *bh, *head;
231 
232                 /*
233                  * This page is locked by callers, and no other thread
234                  * concurrently marks its buffers dirty since they are
235                  * only dirtied through routines in fs/buffer.c in
236                  * which call sites of mark_buffer_dirty are protected
237                  * by page lock.
238                  */
239                 bh = head = page_buffers(page);
240                 do {
241                         /* Do not mark hole blocks dirty */
242                         if (buffer_dirty(bh) || !buffer_mapped(bh))
243                                 continue;
244 
245                         set_buffer_dirty(bh);
246                         nr_dirty++;
247                 } while (bh = bh->b_this_page, bh != head);
248 
249                 if (nr_dirty)
250                         nilfs_set_file_dirty(inode, nr_dirty);
251         } else if (ret) {
252                 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
253 
254                 nilfs_set_file_dirty(inode, nr_dirty);
255         }
256         return ret;
257 }
258 
259 void nilfs_write_failed(struct address_space *mapping, loff_t to)
260 {
261         struct inode *inode = mapping->host;
262 
263         if (to > inode->i_size) {
264                 truncate_pagecache(inode, inode->i_size);
265                 nilfs_truncate(inode);
266         }
267 }
268 
269 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
270                              loff_t pos, unsigned len, unsigned flags,
271                              struct page **pagep, void **fsdata)
272 
273 {
274         struct inode *inode = mapping->host;
275         int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
276 
277         if (unlikely(err))
278                 return err;
279 
280         err = block_write_begin(mapping, pos, len, flags, pagep,
281                                 nilfs_get_block);
282         if (unlikely(err)) {
283                 nilfs_write_failed(mapping, pos + len);
284                 nilfs_transaction_abort(inode->i_sb);
285         }
286         return err;
287 }
288 
289 static int nilfs_write_end(struct file *file, struct address_space *mapping,
290                            loff_t pos, unsigned len, unsigned copied,
291                            struct page *page, void *fsdata)
292 {
293         struct inode *inode = mapping->host;
294         unsigned start = pos & (PAGE_SIZE - 1);
295         unsigned nr_dirty;
296         int err;
297 
298         nr_dirty = nilfs_page_count_clean_buffers(page, start,
299                                                   start + copied);
300         copied = generic_write_end(file, mapping, pos, len, copied, page,
301                                    fsdata);
302         nilfs_set_file_dirty(inode, nr_dirty);
303         err = nilfs_transaction_commit(inode->i_sb);
304         return err ? : copied;
305 }
306 
307 static ssize_t
308 nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
309 {
310         struct inode *inode = file_inode(iocb->ki_filp);
311 
312         if (iov_iter_rw(iter) == WRITE)
313                 return 0;
314 
315         /* Needs synchronization with the cleaner */
316         return blockdev_direct_IO(iocb, inode, iter, offset, nilfs_get_block);
317 }
318 
319 const struct address_space_operations nilfs_aops = {
320         .writepage              = nilfs_writepage,
321         .readpage               = nilfs_readpage,
322         .writepages             = nilfs_writepages,
323         .set_page_dirty         = nilfs_set_page_dirty,
324         .readpages              = nilfs_readpages,
325         .write_begin            = nilfs_write_begin,
326         .write_end              = nilfs_write_end,
327         /* .releasepage         = nilfs_releasepage, */
328         .invalidatepage         = block_invalidatepage,
329         .direct_IO              = nilfs_direct_IO,
330         .is_partially_uptodate  = block_is_partially_uptodate,
331 };
332 
333 static int nilfs_insert_inode_locked(struct inode *inode,
334                                      struct nilfs_root *root,
335                                      unsigned long ino)
336 {
337         struct nilfs_iget_args args = {
338                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
339         };
340 
341         return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
342 }
343 
344 struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
345 {
346         struct super_block *sb = dir->i_sb;
347         struct the_nilfs *nilfs = sb->s_fs_info;
348         struct inode *inode;
349         struct nilfs_inode_info *ii;
350         struct nilfs_root *root;
351         int err = -ENOMEM;
352         ino_t ino;
353 
354         inode = new_inode(sb);
355         if (unlikely(!inode))
356                 goto failed;
357 
358         mapping_set_gfp_mask(inode->i_mapping,
359                            mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
360 
361         root = NILFS_I(dir)->i_root;
362         ii = NILFS_I(inode);
363         ii->i_state = 1 << NILFS_I_NEW;
364         ii->i_root = root;
365 
366         err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
367         if (unlikely(err))
368                 goto failed_ifile_create_inode;
369         /* reference count of i_bh inherits from nilfs_mdt_read_block() */
370 
371         atomic64_inc(&root->inodes_count);
372         inode_init_owner(inode, dir, mode);
373         inode->i_ino = ino;
374         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
375 
376         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
377                 err = nilfs_bmap_read(ii->i_bmap, NULL);
378                 if (err < 0)
379                         goto failed_after_creation;
380 
381                 set_bit(NILFS_I_BMAP, &ii->i_state);
382                 /* No lock is needed; iget() ensures it. */
383         }
384 
385         ii->i_flags = nilfs_mask_flags(
386                 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
387 
388         /* ii->i_file_acl = 0; */
389         /* ii->i_dir_acl = 0; */
390         ii->i_dir_start_lookup = 0;
391         nilfs_set_inode_flags(inode);
392         spin_lock(&nilfs->ns_next_gen_lock);
393         inode->i_generation = nilfs->ns_next_generation++;
394         spin_unlock(&nilfs->ns_next_gen_lock);
395         if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
396                 err = -EIO;
397                 goto failed_after_creation;
398         }
399 
400         err = nilfs_init_acl(inode, dir);
401         if (unlikely(err))
402                 goto failed_after_creation; /* never occur. When supporting
403                                     nilfs_init_acl(), proper cancellation of
404                                     above jobs should be considered */
405 
406         return inode;
407 
408  failed_after_creation:
409         clear_nlink(inode);
410         unlock_new_inode(inode);
411         iput(inode);  /* raw_inode will be deleted through
412                          nilfs_evict_inode() */
413         goto failed;
414 
415  failed_ifile_create_inode:
416         make_bad_inode(inode);
417         iput(inode);  /* if i_nlink == 1, generic_forget_inode() will be
418                          called */
419  failed:
420         return ERR_PTR(err);
421 }
422 
423 void nilfs_set_inode_flags(struct inode *inode)
424 {
425         unsigned int flags = NILFS_I(inode)->i_flags;
426         unsigned int new_fl = 0;
427 
428         if (flags & FS_SYNC_FL)
429                 new_fl |= S_SYNC;
430         if (flags & FS_APPEND_FL)
431                 new_fl |= S_APPEND;
432         if (flags & FS_IMMUTABLE_FL)
433                 new_fl |= S_IMMUTABLE;
434         if (flags & FS_NOATIME_FL)
435                 new_fl |= S_NOATIME;
436         if (flags & FS_DIRSYNC_FL)
437                 new_fl |= S_DIRSYNC;
438         inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
439                         S_NOATIME | S_DIRSYNC);
440 }
441 
442 int nilfs_read_inode_common(struct inode *inode,
443                             struct nilfs_inode *raw_inode)
444 {
445         struct nilfs_inode_info *ii = NILFS_I(inode);
446         int err;
447 
448         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
449         i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
450         i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
451         set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
452         inode->i_size = le64_to_cpu(raw_inode->i_size);
453         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
454         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
455         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
456         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
457         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
458         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
459         if (inode->i_nlink == 0)
460                 return -ESTALE; /* this inode is deleted */
461 
462         inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
463         ii->i_flags = le32_to_cpu(raw_inode->i_flags);
464 #if 0
465         ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
466         ii->i_dir_acl = S_ISREG(inode->i_mode) ?
467                 0 : le32_to_cpu(raw_inode->i_dir_acl);
468 #endif
469         ii->i_dir_start_lookup = 0;
470         inode->i_generation = le32_to_cpu(raw_inode->i_generation);
471 
472         if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
473             S_ISLNK(inode->i_mode)) {
474                 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
475                 if (err < 0)
476                         return err;
477                 set_bit(NILFS_I_BMAP, &ii->i_state);
478                 /* No lock is needed; iget() ensures it. */
479         }
480         return 0;
481 }
482 
483 static int __nilfs_read_inode(struct super_block *sb,
484                               struct nilfs_root *root, unsigned long ino,
485                               struct inode *inode)
486 {
487         struct the_nilfs *nilfs = sb->s_fs_info;
488         struct buffer_head *bh;
489         struct nilfs_inode *raw_inode;
490         int err;
491 
492         down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
493         err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
494         if (unlikely(err))
495                 goto bad_inode;
496 
497         raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
498 
499         err = nilfs_read_inode_common(inode, raw_inode);
500         if (err)
501                 goto failed_unmap;
502 
503         if (S_ISREG(inode->i_mode)) {
504                 inode->i_op = &nilfs_file_inode_operations;
505                 inode->i_fop = &nilfs_file_operations;
506                 inode->i_mapping->a_ops = &nilfs_aops;
507         } else if (S_ISDIR(inode->i_mode)) {
508                 inode->i_op = &nilfs_dir_inode_operations;
509                 inode->i_fop = &nilfs_dir_operations;
510                 inode->i_mapping->a_ops = &nilfs_aops;
511         } else if (S_ISLNK(inode->i_mode)) {
512                 inode->i_op = &nilfs_symlink_inode_operations;
513                 inode_nohighmem(inode);
514                 inode->i_mapping->a_ops = &nilfs_aops;
515         } else {
516                 inode->i_op = &nilfs_special_inode_operations;
517                 init_special_inode(
518                         inode, inode->i_mode,
519                         huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
520         }
521         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
522         brelse(bh);
523         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
524         nilfs_set_inode_flags(inode);
525         mapping_set_gfp_mask(inode->i_mapping,
526                            mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
527         return 0;
528 
529  failed_unmap:
530         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
531         brelse(bh);
532 
533  bad_inode:
534         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
535         return err;
536 }
537 
538 static int nilfs_iget_test(struct inode *inode, void *opaque)
539 {
540         struct nilfs_iget_args *args = opaque;
541         struct nilfs_inode_info *ii;
542 
543         if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
544                 return 0;
545 
546         ii = NILFS_I(inode);
547         if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
548                 return !args->for_gc;
549 
550         return args->for_gc && args->cno == ii->i_cno;
551 }
552 
553 static int nilfs_iget_set(struct inode *inode, void *opaque)
554 {
555         struct nilfs_iget_args *args = opaque;
556 
557         inode->i_ino = args->ino;
558         if (args->for_gc) {
559                 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
560                 NILFS_I(inode)->i_cno = args->cno;
561                 NILFS_I(inode)->i_root = NULL;
562         } else {
563                 if (args->root && args->ino == NILFS_ROOT_INO)
564                         nilfs_get_root(args->root);
565                 NILFS_I(inode)->i_root = args->root;
566         }
567         return 0;
568 }
569 
570 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
571                             unsigned long ino)
572 {
573         struct nilfs_iget_args args = {
574                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
575         };
576 
577         return ilookup5(sb, ino, nilfs_iget_test, &args);
578 }
579 
580 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
581                                 unsigned long ino)
582 {
583         struct nilfs_iget_args args = {
584                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
585         };
586 
587         return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
588 }
589 
590 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
591                          unsigned long ino)
592 {
593         struct inode *inode;
594         int err;
595 
596         inode = nilfs_iget_locked(sb, root, ino);
597         if (unlikely(!inode))
598                 return ERR_PTR(-ENOMEM);
599         if (!(inode->i_state & I_NEW))
600                 return inode;
601 
602         err = __nilfs_read_inode(sb, root, ino, inode);
603         if (unlikely(err)) {
604                 iget_failed(inode);
605                 return ERR_PTR(err);
606         }
607         unlock_new_inode(inode);
608         return inode;
609 }
610 
611 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
612                                 __u64 cno)
613 {
614         struct nilfs_iget_args args = {
615                 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
616         };
617         struct inode *inode;
618         int err;
619 
620         inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
621         if (unlikely(!inode))
622                 return ERR_PTR(-ENOMEM);
623         if (!(inode->i_state & I_NEW))
624                 return inode;
625 
626         err = nilfs_init_gcinode(inode);
627         if (unlikely(err)) {
628                 iget_failed(inode);
629                 return ERR_PTR(err);
630         }
631         unlock_new_inode(inode);
632         return inode;
633 }
634 
635 void nilfs_write_inode_common(struct inode *inode,
636                               struct nilfs_inode *raw_inode, int has_bmap)
637 {
638         struct nilfs_inode_info *ii = NILFS_I(inode);
639 
640         raw_inode->i_mode = cpu_to_le16(inode->i_mode);
641         raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
642         raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
643         raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
644         raw_inode->i_size = cpu_to_le64(inode->i_size);
645         raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
646         raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
647         raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
648         raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
649         raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
650 
651         raw_inode->i_flags = cpu_to_le32(ii->i_flags);
652         raw_inode->i_generation = cpu_to_le32(inode->i_generation);
653 
654         if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
655                 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
656 
657                 /* zero-fill unused portion in the case of super root block */
658                 raw_inode->i_xattr = 0;
659                 raw_inode->i_pad = 0;
660                 memset((void *)raw_inode + sizeof(*raw_inode), 0,
661                        nilfs->ns_inode_size - sizeof(*raw_inode));
662         }
663 
664         if (has_bmap)
665                 nilfs_bmap_write(ii->i_bmap, raw_inode);
666         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
667                 raw_inode->i_device_code =
668                         cpu_to_le64(huge_encode_dev(inode->i_rdev));
669         /* When extending inode, nilfs->ns_inode_size should be checked
670            for substitutions of appended fields */
671 }
672 
673 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
674 {
675         ino_t ino = inode->i_ino;
676         struct nilfs_inode_info *ii = NILFS_I(inode);
677         struct inode *ifile = ii->i_root->ifile;
678         struct nilfs_inode *raw_inode;
679 
680         raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
681 
682         if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
683                 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
684         if (flags & I_DIRTY_DATASYNC)
685                 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
686 
687         nilfs_write_inode_common(inode, raw_inode, 0);
688                 /* XXX: call with has_bmap = 0 is a workaround to avoid
689                    deadlock of bmap. This delays update of i_bmap to just
690                    before writing */
691         nilfs_ifile_unmap_inode(ifile, ino, ibh);
692 }
693 
694 #define NILFS_MAX_TRUNCATE_BLOCKS       16384  /* 64MB for 4KB block */
695 
696 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
697                                 unsigned long from)
698 {
699         __u64 b;
700         int ret;
701 
702         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
703                 return;
704 repeat:
705         ret = nilfs_bmap_last_key(ii->i_bmap, &b);
706         if (ret == -ENOENT)
707                 return;
708         else if (ret < 0)
709                 goto failed;
710 
711         if (b < from)
712                 return;
713 
714         b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
715         ret = nilfs_bmap_truncate(ii->i_bmap, b);
716         nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
717         if (!ret || (ret == -ENOMEM &&
718                      nilfs_bmap_truncate(ii->i_bmap, b) == 0))
719                 goto repeat;
720 
721 failed:
722         nilfs_warning(ii->vfs_inode.i_sb, __func__,
723                       "failed to truncate bmap (ino=%lu, err=%d)",
724                       ii->vfs_inode.i_ino, ret);
725 }
726 
727 void nilfs_truncate(struct inode *inode)
728 {
729         unsigned long blkoff;
730         unsigned int blocksize;
731         struct nilfs_transaction_info ti;
732         struct super_block *sb = inode->i_sb;
733         struct nilfs_inode_info *ii = NILFS_I(inode);
734 
735         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
736                 return;
737         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
738                 return;
739 
740         blocksize = sb->s_blocksize;
741         blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
742         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
743 
744         block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
745 
746         nilfs_truncate_bmap(ii, blkoff);
747 
748         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
749         if (IS_SYNC(inode))
750                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
751 
752         nilfs_mark_inode_dirty(inode);
753         nilfs_set_file_dirty(inode, 0);
754         nilfs_transaction_commit(sb);
755         /* May construct a logical segment and may fail in sync mode.
756            But truncate has no return value. */
757 }
758 
759 static void nilfs_clear_inode(struct inode *inode)
760 {
761         struct nilfs_inode_info *ii = NILFS_I(inode);
762         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
763 
764         /*
765          * Free resources allocated in nilfs_read_inode(), here.
766          */
767         BUG_ON(!list_empty(&ii->i_dirty));
768         brelse(ii->i_bh);
769         ii->i_bh = NULL;
770 
771         if (mdi && mdi->mi_palloc_cache)
772                 nilfs_palloc_destroy_cache(inode);
773 
774         if (test_bit(NILFS_I_BMAP, &ii->i_state))
775                 nilfs_bmap_clear(ii->i_bmap);
776 
777         nilfs_btnode_cache_clear(&ii->i_btnode_cache);
778 
779         if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
780                 nilfs_put_root(ii->i_root);
781 }
782 
783 void nilfs_evict_inode(struct inode *inode)
784 {
785         struct nilfs_transaction_info ti;
786         struct super_block *sb = inode->i_sb;
787         struct nilfs_inode_info *ii = NILFS_I(inode);
788         int ret;
789 
790         if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
791                 truncate_inode_pages_final(&inode->i_data);
792                 clear_inode(inode);
793                 nilfs_clear_inode(inode);
794                 return;
795         }
796         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
797 
798         truncate_inode_pages_final(&inode->i_data);
799 
800         /* TODO: some of the following operations may fail.  */
801         nilfs_truncate_bmap(ii, 0);
802         nilfs_mark_inode_dirty(inode);
803         clear_inode(inode);
804 
805         ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
806         if (!ret)
807                 atomic64_dec(&ii->i_root->inodes_count);
808 
809         nilfs_clear_inode(inode);
810 
811         if (IS_SYNC(inode))
812                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
813         nilfs_transaction_commit(sb);
814         /* May construct a logical segment and may fail in sync mode.
815            But delete_inode has no return value. */
816 }
817 
818 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
819 {
820         struct nilfs_transaction_info ti;
821         struct inode *inode = d_inode(dentry);
822         struct super_block *sb = inode->i_sb;
823         int err;
824 
825         err = inode_change_ok(inode, iattr);
826         if (err)
827                 return err;
828 
829         err = nilfs_transaction_begin(sb, &ti, 0);
830         if (unlikely(err))
831                 return err;
832 
833         if ((iattr->ia_valid & ATTR_SIZE) &&
834             iattr->ia_size != i_size_read(inode)) {
835                 inode_dio_wait(inode);
836                 truncate_setsize(inode, iattr->ia_size);
837                 nilfs_truncate(inode);
838         }
839 
840         setattr_copy(inode, iattr);
841         mark_inode_dirty(inode);
842 
843         if (iattr->ia_valid & ATTR_MODE) {
844                 err = nilfs_acl_chmod(inode);
845                 if (unlikely(err))
846                         goto out_err;
847         }
848 
849         return nilfs_transaction_commit(sb);
850 
851 out_err:
852         nilfs_transaction_abort(sb);
853         return err;
854 }
855 
856 int nilfs_permission(struct inode *inode, int mask)
857 {
858         struct nilfs_root *root = NILFS_I(inode)->i_root;
859         if ((mask & MAY_WRITE) && root &&
860             root->cno != NILFS_CPTREE_CURRENT_CNO)
861                 return -EROFS; /* snapshot is not writable */
862 
863         return generic_permission(inode, mask);
864 }
865 
866 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
867 {
868         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
869         struct nilfs_inode_info *ii = NILFS_I(inode);
870         int err;
871 
872         spin_lock(&nilfs->ns_inode_lock);
873         if (ii->i_bh == NULL) {
874                 spin_unlock(&nilfs->ns_inode_lock);
875                 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
876                                                   inode->i_ino, pbh);
877                 if (unlikely(err))
878                         return err;
879                 spin_lock(&nilfs->ns_inode_lock);
880                 if (ii->i_bh == NULL)
881                         ii->i_bh = *pbh;
882                 else {
883                         brelse(*pbh);
884                         *pbh = ii->i_bh;
885                 }
886         } else
887                 *pbh = ii->i_bh;
888 
889         get_bh(*pbh);
890         spin_unlock(&nilfs->ns_inode_lock);
891         return 0;
892 }
893 
894 int nilfs_inode_dirty(struct inode *inode)
895 {
896         struct nilfs_inode_info *ii = NILFS_I(inode);
897         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
898         int ret = 0;
899 
900         if (!list_empty(&ii->i_dirty)) {
901                 spin_lock(&nilfs->ns_inode_lock);
902                 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
903                         test_bit(NILFS_I_BUSY, &ii->i_state);
904                 spin_unlock(&nilfs->ns_inode_lock);
905         }
906         return ret;
907 }
908 
909 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
910 {
911         struct nilfs_inode_info *ii = NILFS_I(inode);
912         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
913 
914         atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
915 
916         if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
917                 return 0;
918 
919         spin_lock(&nilfs->ns_inode_lock);
920         if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
921             !test_bit(NILFS_I_BUSY, &ii->i_state)) {
922                 /* Because this routine may race with nilfs_dispose_list(),
923                    we have to check NILFS_I_QUEUED here, too. */
924                 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
925                         /* This will happen when somebody is freeing
926                            this inode. */
927                         nilfs_warning(inode->i_sb, __func__,
928                                       "cannot get inode (ino=%lu)\n",
929                                       inode->i_ino);
930                         spin_unlock(&nilfs->ns_inode_lock);
931                         return -EINVAL; /* NILFS_I_DIRTY may remain for
932                                            freeing inode */
933                 }
934                 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
935                 set_bit(NILFS_I_QUEUED, &ii->i_state);
936         }
937         spin_unlock(&nilfs->ns_inode_lock);
938         return 0;
939 }
940 
941 int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
942 {
943         struct buffer_head *ibh;
944         int err;
945 
946         err = nilfs_load_inode_block(inode, &ibh);
947         if (unlikely(err)) {
948                 nilfs_warning(inode->i_sb, __func__,
949                               "failed to reget inode block.\n");
950                 return err;
951         }
952         nilfs_update_inode(inode, ibh, flags);
953         mark_buffer_dirty(ibh);
954         nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
955         brelse(ibh);
956         return 0;
957 }
958 
959 /**
960  * nilfs_dirty_inode - reflect changes on given inode to an inode block.
961  * @inode: inode of the file to be registered.
962  *
963  * nilfs_dirty_inode() loads a inode block containing the specified
964  * @inode and copies data from a nilfs_inode to a corresponding inode
965  * entry in the inode block. This operation is excluded from the segment
966  * construction. This function can be called both as a single operation
967  * and as a part of indivisible file operations.
968  */
969 void nilfs_dirty_inode(struct inode *inode, int flags)
970 {
971         struct nilfs_transaction_info ti;
972         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
973 
974         if (is_bad_inode(inode)) {
975                 nilfs_warning(inode->i_sb, __func__,
976                               "tried to mark bad_inode dirty. ignored.\n");
977                 dump_stack();
978                 return;
979         }
980         if (mdi) {
981                 nilfs_mdt_mark_dirty(inode);
982                 return;
983         }
984         nilfs_transaction_begin(inode->i_sb, &ti, 0);
985         __nilfs_mark_inode_dirty(inode, flags);
986         nilfs_transaction_commit(inode->i_sb); /* never fails */
987 }
988 
989 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
990                  __u64 start, __u64 len)
991 {
992         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
993         __u64 logical = 0, phys = 0, size = 0;
994         __u32 flags = 0;
995         loff_t isize;
996         sector_t blkoff, end_blkoff;
997         sector_t delalloc_blkoff;
998         unsigned long delalloc_blklen;
999         unsigned int blkbits = inode->i_blkbits;
1000         int ret, n;
1001 
1002         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1003         if (ret)
1004                 return ret;
1005 
1006         inode_lock(inode);
1007 
1008         isize = i_size_read(inode);
1009 
1010         blkoff = start >> blkbits;
1011         end_blkoff = (start + len - 1) >> blkbits;
1012 
1013         delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1014                                                         &delalloc_blkoff);
1015 
1016         do {
1017                 __u64 blkphy;
1018                 unsigned int maxblocks;
1019 
1020                 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1021                         if (size) {
1022                                 /* End of the current extent */
1023                                 ret = fiemap_fill_next_extent(
1024                                         fieinfo, logical, phys, size, flags);
1025                                 if (ret)
1026                                         break;
1027                         }
1028                         if (blkoff > end_blkoff)
1029                                 break;
1030 
1031                         flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1032                         logical = blkoff << blkbits;
1033                         phys = 0;
1034                         size = delalloc_blklen << blkbits;
1035 
1036                         blkoff = delalloc_blkoff + delalloc_blklen;
1037                         delalloc_blklen = nilfs_find_uncommitted_extent(
1038                                 inode, blkoff, &delalloc_blkoff);
1039                         continue;
1040                 }
1041 
1042                 /*
1043                  * Limit the number of blocks that we look up so as
1044                  * not to get into the next delayed allocation extent.
1045                  */
1046                 maxblocks = INT_MAX;
1047                 if (delalloc_blklen)
1048                         maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1049                                           maxblocks);
1050                 blkphy = 0;
1051 
1052                 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1053                 n = nilfs_bmap_lookup_contig(
1054                         NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1055                 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1056 
1057                 if (n < 0) {
1058                         int past_eof;
1059 
1060                         if (unlikely(n != -ENOENT))
1061                                 break; /* error */
1062 
1063                         /* HOLE */
1064                         blkoff++;
1065                         past_eof = ((blkoff << blkbits) >= isize);
1066 
1067                         if (size) {
1068                                 /* End of the current extent */
1069 
1070                                 if (past_eof)
1071                                         flags |= FIEMAP_EXTENT_LAST;
1072 
1073                                 ret = fiemap_fill_next_extent(
1074                                         fieinfo, logical, phys, size, flags);
1075                                 if (ret)
1076                                         break;
1077                                 size = 0;
1078                         }
1079                         if (blkoff > end_blkoff || past_eof)
1080                                 break;
1081                 } else {
1082                         if (size) {
1083                                 if (phys && blkphy << blkbits == phys + size) {
1084                                         /* The current extent goes on */
1085                                         size += n << blkbits;
1086                                 } else {
1087                                         /* Terminate the current extent */
1088                                         ret = fiemap_fill_next_extent(
1089                                                 fieinfo, logical, phys, size,
1090                                                 flags);
1091                                         if (ret || blkoff > end_blkoff)
1092                                                 break;
1093 
1094                                         /* Start another extent */
1095                                         flags = FIEMAP_EXTENT_MERGED;
1096                                         logical = blkoff << blkbits;
1097                                         phys = blkphy << blkbits;
1098                                         size = n << blkbits;
1099                                 }
1100                         } else {
1101                                 /* Start a new extent */
1102                                 flags = FIEMAP_EXTENT_MERGED;
1103                                 logical = blkoff << blkbits;
1104                                 phys = blkphy << blkbits;
1105                                 size = n << blkbits;
1106                         }
1107                         blkoff += n;
1108                 }
1109                 cond_resched();
1110         } while (true);
1111 
1112         /* If ret is 1 then we just hit the end of the extent array */
1113         if (ret == 1)
1114                 ret = 0;
1115 
1116         inode_unlock(inode);
1117         return ret;
1118 }
1119 

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