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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  * Written by Ryusuke Konishi.
 17  *
 18  */
 19 
 20 #include <linux/buffer_head.h>
 21 #include <linux/gfp.h>
 22 #include <linux/mpage.h>
 23 #include <linux/pagemap.h>
 24 #include <linux/writeback.h>
 25 #include <linux/uio.h>
 26 #include "nilfs.h"
 27 #include "btnode.h"
 28 #include "segment.h"
 29 #include "page.h"
 30 #include "mdt.h"
 31 #include "cpfile.h"
 32 #include "ifile.h"
 33 
 34 /**
 35  * struct nilfs_iget_args - arguments used during comparison between inodes
 36  * @ino: inode number
 37  * @cno: checkpoint number
 38  * @root: pointer on NILFS root object (mounted checkpoint)
 39  * @for_gc: inode for GC flag
 40  */
 41 struct nilfs_iget_args {
 42         u64 ino;
 43         __u64 cno;
 44         struct nilfs_root *root;
 45         int for_gc;
 46 };
 47 
 48 static int nilfs_iget_test(struct inode *inode, void *opaque);
 49 
 50 void nilfs_inode_add_blocks(struct inode *inode, int n)
 51 {
 52         struct nilfs_root *root = NILFS_I(inode)->i_root;
 53 
 54         inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
 55         if (root)
 56                 atomic64_add(n, &root->blocks_count);
 57 }
 58 
 59 void nilfs_inode_sub_blocks(struct inode *inode, int n)
 60 {
 61         struct nilfs_root *root = NILFS_I(inode)->i_root;
 62 
 63         inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
 64         if (root)
 65                 atomic64_sub(n, &root->blocks_count);
 66 }
 67 
 68 /**
 69  * nilfs_get_block() - get a file block on the filesystem (callback function)
 70  * @inode - inode struct of the target file
 71  * @blkoff - file block number
 72  * @bh_result - buffer head to be mapped on
 73  * @create - indicate whether allocating the block or not when it has not
 74  *      been allocated yet.
 75  *
 76  * This function does not issue actual read request of the specified data
 77  * block. It is done by VFS.
 78  */
 79 int nilfs_get_block(struct inode *inode, sector_t blkoff,
 80                     struct buffer_head *bh_result, int create)
 81 {
 82         struct nilfs_inode_info *ii = NILFS_I(inode);
 83         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 84         __u64 blknum = 0;
 85         int err = 0, ret;
 86         unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
 87 
 88         down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
 89         ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
 90         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
 91         if (ret >= 0) { /* found */
 92                 map_bh(bh_result, inode->i_sb, blknum);
 93                 if (ret > 0)
 94                         bh_result->b_size = (ret << inode->i_blkbits);
 95                 goto out;
 96         }
 97         /* data block was not found */
 98         if (ret == -ENOENT && create) {
 99                 struct nilfs_transaction_info ti;
100 
101                 bh_result->b_blocknr = 0;
102                 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
103                 if (unlikely(err))
104                         goto out;
105                 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
106                                         (unsigned long)bh_result);
107                 if (unlikely(err != 0)) {
108                         if (err == -EEXIST) {
109                                 /*
110                                  * The get_block() function could be called
111                                  * from multiple callers for an inode.
112                                  * However, the page having this block must
113                                  * be locked in this case.
114                                  */
115                                 printk(KERN_WARNING
116                                        "nilfs_get_block: a race condition "
117                                        "while inserting a data block. "
118                                        "(inode number=%lu, file block "
119                                        "offset=%llu)\n",
120                                        inode->i_ino,
121                                        (unsigned long long)blkoff);
122                                 err = 0;
123                         }
124                         nilfs_transaction_abort(inode->i_sb);
125                         goto out;
126                 }
127                 nilfs_mark_inode_dirty_sync(inode);
128                 nilfs_transaction_commit(inode->i_sb); /* never fails */
129                 /* Error handling should be detailed */
130                 set_buffer_new(bh_result);
131                 set_buffer_delay(bh_result);
132                 map_bh(bh_result, inode->i_sb, 0);
133                 /* Disk block number must be changed to proper value */
134 
135         } else if (ret == -ENOENT) {
136                 /*
137                  * not found is not error (e.g. hole); must return without
138                  * the mapped state flag.
139                  */
140                 ;
141         } else {
142                 err = ret;
143         }
144 
145  out:
146         return err;
147 }
148 
149 /**
150  * nilfs_readpage() - implement readpage() method of nilfs_aops {}
151  * address_space_operations.
152  * @file - file struct of the file to be read
153  * @page - the page to be read
154  */
155 static int nilfs_readpage(struct file *file, struct page *page)
156 {
157         return mpage_readpage(page, nilfs_get_block);
158 }
159 
160 /**
161  * nilfs_readpages() - implement readpages() method of nilfs_aops {}
162  * address_space_operations.
163  * @file - file struct of the file to be read
164  * @mapping - address_space struct used for reading multiple pages
165  * @pages - the pages to be read
166  * @nr_pages - number of pages to be read
167  */
168 static int nilfs_readpages(struct file *file, struct address_space *mapping,
169                            struct list_head *pages, unsigned int nr_pages)
170 {
171         return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
172 }
173 
174 static int nilfs_writepages(struct address_space *mapping,
175                             struct writeback_control *wbc)
176 {
177         struct inode *inode = mapping->host;
178         int err = 0;
179 
180         if (inode->i_sb->s_flags & MS_RDONLY) {
181                 nilfs_clear_dirty_pages(mapping, false);
182                 return -EROFS;
183         }
184 
185         if (wbc->sync_mode == WB_SYNC_ALL)
186                 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
187                                                     wbc->range_start,
188                                                     wbc->range_end);
189         return err;
190 }
191 
192 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
193 {
194         struct inode *inode = page->mapping->host;
195         int err;
196 
197         if (inode->i_sb->s_flags & MS_RDONLY) {
198                 /*
199                  * It means that filesystem was remounted in read-only
200                  * mode because of error or metadata corruption. But we
201                  * have dirty pages that try to be flushed in background.
202                  * So, here we simply discard this dirty page.
203                  */
204                 nilfs_clear_dirty_page(page, false);
205                 unlock_page(page);
206                 return -EROFS;
207         }
208 
209         redirty_page_for_writepage(wbc, page);
210         unlock_page(page);
211 
212         if (wbc->sync_mode == WB_SYNC_ALL) {
213                 err = nilfs_construct_segment(inode->i_sb);
214                 if (unlikely(err))
215                         return err;
216         } else if (wbc->for_reclaim)
217                 nilfs_flush_segment(inode->i_sb, inode->i_ino);
218 
219         return 0;
220 }
221 
222 static int nilfs_set_page_dirty(struct page *page)
223 {
224         struct inode *inode = page->mapping->host;
225         int ret = __set_page_dirty_nobuffers(page);
226 
227         if (page_has_buffers(page)) {
228                 unsigned int nr_dirty = 0;
229                 struct buffer_head *bh, *head;
230 
231                 /*
232                  * This page is locked by callers, and no other thread
233                  * concurrently marks its buffers dirty since they are
234                  * only dirtied through routines in fs/buffer.c in
235                  * which call sites of mark_buffer_dirty are protected
236                  * by page lock.
237                  */
238                 bh = head = page_buffers(page);
239                 do {
240                         /* Do not mark hole blocks dirty */
241                         if (buffer_dirty(bh) || !buffer_mapped(bh))
242                                 continue;
243 
244                         set_buffer_dirty(bh);
245                         nr_dirty++;
246                 } while (bh = bh->b_this_page, bh != head);
247 
248                 if (nr_dirty)
249                         nilfs_set_file_dirty(inode, nr_dirty);
250         } else if (ret) {
251                 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
252 
253                 nilfs_set_file_dirty(inode, nr_dirty);
254         }
255         return ret;
256 }
257 
258 void nilfs_write_failed(struct address_space *mapping, loff_t to)
259 {
260         struct inode *inode = mapping->host;
261 
262         if (to > inode->i_size) {
263                 truncate_pagecache(inode, inode->i_size);
264                 nilfs_truncate(inode);
265         }
266 }
267 
268 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
269                              loff_t pos, unsigned len, unsigned flags,
270                              struct page **pagep, void **fsdata)
271 
272 {
273         struct inode *inode = mapping->host;
274         int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
275 
276         if (unlikely(err))
277                 return err;
278 
279         err = block_write_begin(mapping, pos, len, flags, pagep,
280                                 nilfs_get_block);
281         if (unlikely(err)) {
282                 nilfs_write_failed(mapping, pos + len);
283                 nilfs_transaction_abort(inode->i_sb);
284         }
285         return err;
286 }
287 
288 static int nilfs_write_end(struct file *file, struct address_space *mapping,
289                            loff_t pos, unsigned len, unsigned copied,
290                            struct page *page, void *fsdata)
291 {
292         struct inode *inode = mapping->host;
293         unsigned int start = pos & (PAGE_SIZE - 1);
294         unsigned int nr_dirty;
295         int err;
296 
297         nr_dirty = nilfs_page_count_clean_buffers(page, start,
298                                                   start + copied);
299         copied = generic_write_end(file, mapping, pos, len, copied, page,
300                                    fsdata);
301         nilfs_set_file_dirty(inode, nr_dirty);
302         err = nilfs_transaction_commit(inode->i_sb);
303         return err ? : copied;
304 }
305 
306 static ssize_t
307 nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
308 {
309         struct inode *inode = file_inode(iocb->ki_filp);
310 
311         if (iov_iter_rw(iter) == WRITE)
312                 return 0;
313 
314         /* Needs synchronization with the cleaner */
315         return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
316 }
317 
318 const struct address_space_operations nilfs_aops = {
319         .writepage              = nilfs_writepage,
320         .readpage               = nilfs_readpage,
321         .writepages             = nilfs_writepages,
322         .set_page_dirty         = nilfs_set_page_dirty,
323         .readpages              = nilfs_readpages,
324         .write_begin            = nilfs_write_begin,
325         .write_end              = nilfs_write_end,
326         /* .releasepage         = nilfs_releasepage, */
327         .invalidatepage         = block_invalidatepage,
328         .direct_IO              = nilfs_direct_IO,
329         .is_partially_uptodate  = block_is_partially_uptodate,
330 };
331 
332 static int nilfs_insert_inode_locked(struct inode *inode,
333                                      struct nilfs_root *root,
334                                      unsigned long ino)
335 {
336         struct nilfs_iget_args args = {
337                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
338         };
339 
340         return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
341 }
342 
343 struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
344 {
345         struct super_block *sb = dir->i_sb;
346         struct the_nilfs *nilfs = sb->s_fs_info;
347         struct inode *inode;
348         struct nilfs_inode_info *ii;
349         struct nilfs_root *root;
350         int err = -ENOMEM;
351         ino_t ino;
352 
353         inode = new_inode(sb);
354         if (unlikely(!inode))
355                 goto failed;
356 
357         mapping_set_gfp_mask(inode->i_mapping,
358                            mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
359 
360         root = NILFS_I(dir)->i_root;
361         ii = NILFS_I(inode);
362         ii->i_state = 1 << NILFS_I_NEW;
363         ii->i_root = root;
364 
365         err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
366         if (unlikely(err))
367                 goto failed_ifile_create_inode;
368         /* reference count of i_bh inherits from nilfs_mdt_read_block() */
369 
370         atomic64_inc(&root->inodes_count);
371         inode_init_owner(inode, dir, mode);
372         inode->i_ino = ino;
373         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
374 
375         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
376                 err = nilfs_bmap_read(ii->i_bmap, NULL);
377                 if (err < 0)
378                         goto failed_after_creation;
379 
380                 set_bit(NILFS_I_BMAP, &ii->i_state);
381                 /* No lock is needed; iget() ensures it. */
382         }
383 
384         ii->i_flags = nilfs_mask_flags(
385                 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
386 
387         /* ii->i_file_acl = 0; */
388         /* ii->i_dir_acl = 0; */
389         ii->i_dir_start_lookup = 0;
390         nilfs_set_inode_flags(inode);
391         spin_lock(&nilfs->ns_next_gen_lock);
392         inode->i_generation = nilfs->ns_next_generation++;
393         spin_unlock(&nilfs->ns_next_gen_lock);
394         if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
395                 err = -EIO;
396                 goto failed_after_creation;
397         }
398 
399         err = nilfs_init_acl(inode, dir);
400         if (unlikely(err))
401                 /*
402                  * Never occur.  When supporting nilfs_init_acl(),
403                  * proper cancellation of above jobs should be considered.
404                  */
405                 goto failed_after_creation;
406 
407         return inode;
408 
409  failed_after_creation:
410         clear_nlink(inode);
411         unlock_new_inode(inode);
412         iput(inode);  /*
413                        * raw_inode will be deleted through
414                        * nilfs_evict_inode().
415                        */
416         goto failed;
417 
418  failed_ifile_create_inode:
419         make_bad_inode(inode);
420         iput(inode);
421  failed:
422         return ERR_PTR(err);
423 }
424 
425 void nilfs_set_inode_flags(struct inode *inode)
426 {
427         unsigned int flags = NILFS_I(inode)->i_flags;
428         unsigned int new_fl = 0;
429 
430         if (flags & FS_SYNC_FL)
431                 new_fl |= S_SYNC;
432         if (flags & FS_APPEND_FL)
433                 new_fl |= S_APPEND;
434         if (flags & FS_IMMUTABLE_FL)
435                 new_fl |= S_IMMUTABLE;
436         if (flags & FS_NOATIME_FL)
437                 new_fl |= S_NOATIME;
438         if (flags & FS_DIRSYNC_FL)
439                 new_fl |= S_DIRSYNC;
440         inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
441                         S_NOATIME | S_DIRSYNC);
442 }
443 
444 int nilfs_read_inode_common(struct inode *inode,
445                             struct nilfs_inode *raw_inode)
446 {
447         struct nilfs_inode_info *ii = NILFS_I(inode);
448         int err;
449 
450         inode->i_mode = le16_to_cpu(raw_inode->i_mode);
451         i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
452         i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
453         set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
454         inode->i_size = le64_to_cpu(raw_inode->i_size);
455         inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
456         inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
457         inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
458         inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
459         inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
460         inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
461         if (inode->i_nlink == 0)
462                 return -ESTALE; /* this inode is deleted */
463 
464         inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
465         ii->i_flags = le32_to_cpu(raw_inode->i_flags);
466 #if 0
467         ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
468         ii->i_dir_acl = S_ISREG(inode->i_mode) ?
469                 0 : le32_to_cpu(raw_inode->i_dir_acl);
470 #endif
471         ii->i_dir_start_lookup = 0;
472         inode->i_generation = le32_to_cpu(raw_inode->i_generation);
473 
474         if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
475             S_ISLNK(inode->i_mode)) {
476                 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
477                 if (err < 0)
478                         return err;
479                 set_bit(NILFS_I_BMAP, &ii->i_state);
480                 /* No lock is needed; iget() ensures it. */
481         }
482         return 0;
483 }
484 
485 static int __nilfs_read_inode(struct super_block *sb,
486                               struct nilfs_root *root, unsigned long ino,
487                               struct inode *inode)
488 {
489         struct the_nilfs *nilfs = sb->s_fs_info;
490         struct buffer_head *bh;
491         struct nilfs_inode *raw_inode;
492         int err;
493 
494         down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
495         err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
496         if (unlikely(err))
497                 goto bad_inode;
498 
499         raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
500 
501         err = nilfs_read_inode_common(inode, raw_inode);
502         if (err)
503                 goto failed_unmap;
504 
505         if (S_ISREG(inode->i_mode)) {
506                 inode->i_op = &nilfs_file_inode_operations;
507                 inode->i_fop = &nilfs_file_operations;
508                 inode->i_mapping->a_ops = &nilfs_aops;
509         } else if (S_ISDIR(inode->i_mode)) {
510                 inode->i_op = &nilfs_dir_inode_operations;
511                 inode->i_fop = &nilfs_dir_operations;
512                 inode->i_mapping->a_ops = &nilfs_aops;
513         } else if (S_ISLNK(inode->i_mode)) {
514                 inode->i_op = &nilfs_symlink_inode_operations;
515                 inode_nohighmem(inode);
516                 inode->i_mapping->a_ops = &nilfs_aops;
517         } else {
518                 inode->i_op = &nilfs_special_inode_operations;
519                 init_special_inode(
520                         inode, inode->i_mode,
521                         huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
522         }
523         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
524         brelse(bh);
525         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
526         nilfs_set_inode_flags(inode);
527         mapping_set_gfp_mask(inode->i_mapping,
528                            mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
529         return 0;
530 
531  failed_unmap:
532         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
533         brelse(bh);
534 
535  bad_inode:
536         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
537         return err;
538 }
539 
540 static int nilfs_iget_test(struct inode *inode, void *opaque)
541 {
542         struct nilfs_iget_args *args = opaque;
543         struct nilfs_inode_info *ii;
544 
545         if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
546                 return 0;
547 
548         ii = NILFS_I(inode);
549         if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
550                 return !args->for_gc;
551 
552         return args->for_gc && args->cno == ii->i_cno;
553 }
554 
555 static int nilfs_iget_set(struct inode *inode, void *opaque)
556 {
557         struct nilfs_iget_args *args = opaque;
558 
559         inode->i_ino = args->ino;
560         if (args->for_gc) {
561                 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
562                 NILFS_I(inode)->i_cno = args->cno;
563                 NILFS_I(inode)->i_root = NULL;
564         } else {
565                 if (args->root && args->ino == NILFS_ROOT_INO)
566                         nilfs_get_root(args->root);
567                 NILFS_I(inode)->i_root = args->root;
568         }
569         return 0;
570 }
571 
572 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
573                             unsigned long ino)
574 {
575         struct nilfs_iget_args args = {
576                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
577         };
578 
579         return ilookup5(sb, ino, nilfs_iget_test, &args);
580 }
581 
582 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
583                                 unsigned long ino)
584 {
585         struct nilfs_iget_args args = {
586                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
587         };
588 
589         return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
590 }
591 
592 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
593                          unsigned long ino)
594 {
595         struct inode *inode;
596         int err;
597 
598         inode = nilfs_iget_locked(sb, root, ino);
599         if (unlikely(!inode))
600                 return ERR_PTR(-ENOMEM);
601         if (!(inode->i_state & I_NEW))
602                 return inode;
603 
604         err = __nilfs_read_inode(sb, root, ino, inode);
605         if (unlikely(err)) {
606                 iget_failed(inode);
607                 return ERR_PTR(err);
608         }
609         unlock_new_inode(inode);
610         return inode;
611 }
612 
613 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
614                                 __u64 cno)
615 {
616         struct nilfs_iget_args args = {
617                 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
618         };
619         struct inode *inode;
620         int err;
621 
622         inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
623         if (unlikely(!inode))
624                 return ERR_PTR(-ENOMEM);
625         if (!(inode->i_state & I_NEW))
626                 return inode;
627 
628         err = nilfs_init_gcinode(inode);
629         if (unlikely(err)) {
630                 iget_failed(inode);
631                 return ERR_PTR(err);
632         }
633         unlock_new_inode(inode);
634         return inode;
635 }
636 
637 void nilfs_write_inode_common(struct inode *inode,
638                               struct nilfs_inode *raw_inode, int has_bmap)
639 {
640         struct nilfs_inode_info *ii = NILFS_I(inode);
641 
642         raw_inode->i_mode = cpu_to_le16(inode->i_mode);
643         raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
644         raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
645         raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
646         raw_inode->i_size = cpu_to_le64(inode->i_size);
647         raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
648         raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
649         raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
650         raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
651         raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
652 
653         raw_inode->i_flags = cpu_to_le32(ii->i_flags);
654         raw_inode->i_generation = cpu_to_le32(inode->i_generation);
655 
656         if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
657                 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
658 
659                 /* zero-fill unused portion in the case of super root block */
660                 raw_inode->i_xattr = 0;
661                 raw_inode->i_pad = 0;
662                 memset((void *)raw_inode + sizeof(*raw_inode), 0,
663                        nilfs->ns_inode_size - sizeof(*raw_inode));
664         }
665 
666         if (has_bmap)
667                 nilfs_bmap_write(ii->i_bmap, raw_inode);
668         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
669                 raw_inode->i_device_code =
670                         cpu_to_le64(huge_encode_dev(inode->i_rdev));
671         /*
672          * When extending inode, nilfs->ns_inode_size should be checked
673          * for substitutions of appended fields.
674          */
675 }
676 
677 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
678 {
679         ino_t ino = inode->i_ino;
680         struct nilfs_inode_info *ii = NILFS_I(inode);
681         struct inode *ifile = ii->i_root->ifile;
682         struct nilfs_inode *raw_inode;
683 
684         raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
685 
686         if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
687                 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
688         if (flags & I_DIRTY_DATASYNC)
689                 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
690 
691         nilfs_write_inode_common(inode, raw_inode, 0);
692                 /*
693                  * XXX: call with has_bmap = 0 is a workaround to avoid
694                  * deadlock of bmap.  This delays update of i_bmap to just
695                  * before writing.
696                  */
697 
698         nilfs_ifile_unmap_inode(ifile, ino, ibh);
699 }
700 
701 #define NILFS_MAX_TRUNCATE_BLOCKS       16384  /* 64MB for 4KB block */
702 
703 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
704                                 unsigned long from)
705 {
706         __u64 b;
707         int ret;
708 
709         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
710                 return;
711 repeat:
712         ret = nilfs_bmap_last_key(ii->i_bmap, &b);
713         if (ret == -ENOENT)
714                 return;
715         else if (ret < 0)
716                 goto failed;
717 
718         if (b < from)
719                 return;
720 
721         b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
722         ret = nilfs_bmap_truncate(ii->i_bmap, b);
723         nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
724         if (!ret || (ret == -ENOMEM &&
725                      nilfs_bmap_truncate(ii->i_bmap, b) == 0))
726                 goto repeat;
727 
728 failed:
729         nilfs_warning(ii->vfs_inode.i_sb, __func__,
730                       "failed to truncate bmap (ino=%lu, err=%d)",
731                       ii->vfs_inode.i_ino, ret);
732 }
733 
734 void nilfs_truncate(struct inode *inode)
735 {
736         unsigned long blkoff;
737         unsigned int blocksize;
738         struct nilfs_transaction_info ti;
739         struct super_block *sb = inode->i_sb;
740         struct nilfs_inode_info *ii = NILFS_I(inode);
741 
742         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
743                 return;
744         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
745                 return;
746 
747         blocksize = sb->s_blocksize;
748         blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
749         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
750 
751         block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
752 
753         nilfs_truncate_bmap(ii, blkoff);
754 
755         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
756         if (IS_SYNC(inode))
757                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
758 
759         nilfs_mark_inode_dirty(inode);
760         nilfs_set_file_dirty(inode, 0);
761         nilfs_transaction_commit(sb);
762         /*
763          * May construct a logical segment and may fail in sync mode.
764          * But truncate has no return value.
765          */
766 }
767 
768 static void nilfs_clear_inode(struct inode *inode)
769 {
770         struct nilfs_inode_info *ii = NILFS_I(inode);
771 
772         /*
773          * Free resources allocated in nilfs_read_inode(), here.
774          */
775         BUG_ON(!list_empty(&ii->i_dirty));
776         brelse(ii->i_bh);
777         ii->i_bh = NULL;
778 
779         if (nilfs_is_metadata_file_inode(inode))
780                 nilfs_mdt_clear(inode);
781 
782         if (test_bit(NILFS_I_BMAP, &ii->i_state))
783                 nilfs_bmap_clear(ii->i_bmap);
784 
785         nilfs_btnode_cache_clear(&ii->i_btnode_cache);
786 
787         if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
788                 nilfs_put_root(ii->i_root);
789 }
790 
791 void nilfs_evict_inode(struct inode *inode)
792 {
793         struct nilfs_transaction_info ti;
794         struct super_block *sb = inode->i_sb;
795         struct nilfs_inode_info *ii = NILFS_I(inode);
796         int ret;
797 
798         if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
799                 truncate_inode_pages_final(&inode->i_data);
800                 clear_inode(inode);
801                 nilfs_clear_inode(inode);
802                 return;
803         }
804         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
805 
806         truncate_inode_pages_final(&inode->i_data);
807 
808         /* TODO: some of the following operations may fail.  */
809         nilfs_truncate_bmap(ii, 0);
810         nilfs_mark_inode_dirty(inode);
811         clear_inode(inode);
812 
813         ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
814         if (!ret)
815                 atomic64_dec(&ii->i_root->inodes_count);
816 
817         nilfs_clear_inode(inode);
818 
819         if (IS_SYNC(inode))
820                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
821         nilfs_transaction_commit(sb);
822         /*
823          * May construct a logical segment and may fail in sync mode.
824          * But delete_inode has no return value.
825          */
826 }
827 
828 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
829 {
830         struct nilfs_transaction_info ti;
831         struct inode *inode = d_inode(dentry);
832         struct super_block *sb = inode->i_sb;
833         int err;
834 
835         err = inode_change_ok(inode, iattr);
836         if (err)
837                 return err;
838 
839         err = nilfs_transaction_begin(sb, &ti, 0);
840         if (unlikely(err))
841                 return err;
842 
843         if ((iattr->ia_valid & ATTR_SIZE) &&
844             iattr->ia_size != i_size_read(inode)) {
845                 inode_dio_wait(inode);
846                 truncate_setsize(inode, iattr->ia_size);
847                 nilfs_truncate(inode);
848         }
849 
850         setattr_copy(inode, iattr);
851         mark_inode_dirty(inode);
852 
853         if (iattr->ia_valid & ATTR_MODE) {
854                 err = nilfs_acl_chmod(inode);
855                 if (unlikely(err))
856                         goto out_err;
857         }
858 
859         return nilfs_transaction_commit(sb);
860 
861 out_err:
862         nilfs_transaction_abort(sb);
863         return err;
864 }
865 
866 int nilfs_permission(struct inode *inode, int mask)
867 {
868         struct nilfs_root *root = NILFS_I(inode)->i_root;
869 
870         if ((mask & MAY_WRITE) && root &&
871             root->cno != NILFS_CPTREE_CURRENT_CNO)
872                 return -EROFS; /* snapshot is not writable */
873 
874         return generic_permission(inode, mask);
875 }
876 
877 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
878 {
879         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
880         struct nilfs_inode_info *ii = NILFS_I(inode);
881         int err;
882 
883         spin_lock(&nilfs->ns_inode_lock);
884         if (ii->i_bh == NULL) {
885                 spin_unlock(&nilfs->ns_inode_lock);
886                 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
887                                                   inode->i_ino, pbh);
888                 if (unlikely(err))
889                         return err;
890                 spin_lock(&nilfs->ns_inode_lock);
891                 if (ii->i_bh == NULL)
892                         ii->i_bh = *pbh;
893                 else {
894                         brelse(*pbh);
895                         *pbh = ii->i_bh;
896                 }
897         } else
898                 *pbh = ii->i_bh;
899 
900         get_bh(*pbh);
901         spin_unlock(&nilfs->ns_inode_lock);
902         return 0;
903 }
904 
905 int nilfs_inode_dirty(struct inode *inode)
906 {
907         struct nilfs_inode_info *ii = NILFS_I(inode);
908         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
909         int ret = 0;
910 
911         if (!list_empty(&ii->i_dirty)) {
912                 spin_lock(&nilfs->ns_inode_lock);
913                 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
914                         test_bit(NILFS_I_BUSY, &ii->i_state);
915                 spin_unlock(&nilfs->ns_inode_lock);
916         }
917         return ret;
918 }
919 
920 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
921 {
922         struct nilfs_inode_info *ii = NILFS_I(inode);
923         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
924 
925         atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
926 
927         if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
928                 return 0;
929 
930         spin_lock(&nilfs->ns_inode_lock);
931         if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
932             !test_bit(NILFS_I_BUSY, &ii->i_state)) {
933                 /*
934                  * Because this routine may race with nilfs_dispose_list(),
935                  * we have to check NILFS_I_QUEUED here, too.
936                  */
937                 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
938                         /*
939                          * This will happen when somebody is freeing
940                          * this inode.
941                          */
942                         nilfs_warning(inode->i_sb, __func__,
943                                       "cannot get inode (ino=%lu)",
944                                       inode->i_ino);
945                         spin_unlock(&nilfs->ns_inode_lock);
946                         return -EINVAL; /*
947                                          * NILFS_I_DIRTY may remain for
948                                          * freeing inode.
949                                          */
950                 }
951                 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
952                 set_bit(NILFS_I_QUEUED, &ii->i_state);
953         }
954         spin_unlock(&nilfs->ns_inode_lock);
955         return 0;
956 }
957 
958 int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
959 {
960         struct buffer_head *ibh;
961         int err;
962 
963         err = nilfs_load_inode_block(inode, &ibh);
964         if (unlikely(err)) {
965                 nilfs_warning(inode->i_sb, __func__,
966                               "failed to reget inode block.");
967                 return err;
968         }
969         nilfs_update_inode(inode, ibh, flags);
970         mark_buffer_dirty(ibh);
971         nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
972         brelse(ibh);
973         return 0;
974 }
975 
976 /**
977  * nilfs_dirty_inode - reflect changes on given inode to an inode block.
978  * @inode: inode of the file to be registered.
979  *
980  * nilfs_dirty_inode() loads a inode block containing the specified
981  * @inode and copies data from a nilfs_inode to a corresponding inode
982  * entry in the inode block. This operation is excluded from the segment
983  * construction. This function can be called both as a single operation
984  * and as a part of indivisible file operations.
985  */
986 void nilfs_dirty_inode(struct inode *inode, int flags)
987 {
988         struct nilfs_transaction_info ti;
989         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
990 
991         if (is_bad_inode(inode)) {
992                 nilfs_warning(inode->i_sb, __func__,
993                               "tried to mark bad_inode dirty. ignored.");
994                 dump_stack();
995                 return;
996         }
997         if (mdi) {
998                 nilfs_mdt_mark_dirty(inode);
999                 return;
1000         }
1001         nilfs_transaction_begin(inode->i_sb, &ti, 0);
1002         __nilfs_mark_inode_dirty(inode, flags);
1003         nilfs_transaction_commit(inode->i_sb); /* never fails */
1004 }
1005 
1006 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1007                  __u64 start, __u64 len)
1008 {
1009         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1010         __u64 logical = 0, phys = 0, size = 0;
1011         __u32 flags = 0;
1012         loff_t isize;
1013         sector_t blkoff, end_blkoff;
1014         sector_t delalloc_blkoff;
1015         unsigned long delalloc_blklen;
1016         unsigned int blkbits = inode->i_blkbits;
1017         int ret, n;
1018 
1019         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1020         if (ret)
1021                 return ret;
1022 
1023         inode_lock(inode);
1024 
1025         isize = i_size_read(inode);
1026 
1027         blkoff = start >> blkbits;
1028         end_blkoff = (start + len - 1) >> blkbits;
1029 
1030         delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1031                                                         &delalloc_blkoff);
1032 
1033         do {
1034                 __u64 blkphy;
1035                 unsigned int maxblocks;
1036 
1037                 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1038                         if (size) {
1039                                 /* End of the current extent */
1040                                 ret = fiemap_fill_next_extent(
1041                                         fieinfo, logical, phys, size, flags);
1042                                 if (ret)
1043                                         break;
1044                         }
1045                         if (blkoff > end_blkoff)
1046                                 break;
1047 
1048                         flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1049                         logical = blkoff << blkbits;
1050                         phys = 0;
1051                         size = delalloc_blklen << blkbits;
1052 
1053                         blkoff = delalloc_blkoff + delalloc_blklen;
1054                         delalloc_blklen = nilfs_find_uncommitted_extent(
1055                                 inode, blkoff, &delalloc_blkoff);
1056                         continue;
1057                 }
1058 
1059                 /*
1060                  * Limit the number of blocks that we look up so as
1061                  * not to get into the next delayed allocation extent.
1062                  */
1063                 maxblocks = INT_MAX;
1064                 if (delalloc_blklen)
1065                         maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1066                                           maxblocks);
1067                 blkphy = 0;
1068 
1069                 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1070                 n = nilfs_bmap_lookup_contig(
1071                         NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1072                 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1073 
1074                 if (n < 0) {
1075                         int past_eof;
1076 
1077                         if (unlikely(n != -ENOENT))
1078                                 break; /* error */
1079 
1080                         /* HOLE */
1081                         blkoff++;
1082                         past_eof = ((blkoff << blkbits) >= isize);
1083 
1084                         if (size) {
1085                                 /* End of the current extent */
1086 
1087                                 if (past_eof)
1088                                         flags |= FIEMAP_EXTENT_LAST;
1089 
1090                                 ret = fiemap_fill_next_extent(
1091                                         fieinfo, logical, phys, size, flags);
1092                                 if (ret)
1093                                         break;
1094                                 size = 0;
1095                         }
1096                         if (blkoff > end_blkoff || past_eof)
1097                                 break;
1098                 } else {
1099                         if (size) {
1100                                 if (phys && blkphy << blkbits == phys + size) {
1101                                         /* The current extent goes on */
1102                                         size += n << blkbits;
1103                                 } else {
1104                                         /* Terminate the current extent */
1105                                         ret = fiemap_fill_next_extent(
1106                                                 fieinfo, logical, phys, size,
1107                                                 flags);
1108                                         if (ret || blkoff > end_blkoff)
1109                                                 break;
1110 
1111                                         /* Start another extent */
1112                                         flags = FIEMAP_EXTENT_MERGED;
1113                                         logical = blkoff << blkbits;
1114                                         phys = blkphy << blkbits;
1115                                         size = n << blkbits;
1116                                 }
1117                         } else {
1118                                 /* Start a new extent */
1119                                 flags = FIEMAP_EXTENT_MERGED;
1120                                 logical = blkoff << blkbits;
1121                                 phys = blkphy << blkbits;
1122                                 size = n << blkbits;
1123                         }
1124                         blkoff += n;
1125                 }
1126                 cond_resched();
1127         } while (true);
1128 
1129         /* If ret is 1 then we just hit the end of the extent array */
1130         if (ret == 1)
1131                 ret = 0;
1132 
1133         inode_unlock(inode);
1134         return ret;
1135 }
1136 

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