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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_CACHE_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_CACHE_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_mask(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->i_mapping->a_ops = &nilfs_aops;
514         } else {
515                 inode->i_op = &nilfs_special_inode_operations;
516                 init_special_inode(
517                         inode, inode->i_mode,
518                         huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
519         }
520         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
521         brelse(bh);
522         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
523         nilfs_set_inode_flags(inode);
524         mapping_set_gfp_mask(inode->i_mapping,
525                              mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
526         return 0;
527 
528  failed_unmap:
529         nilfs_ifile_unmap_inode(root->ifile, ino, bh);
530         brelse(bh);
531 
532  bad_inode:
533         up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
534         return err;
535 }
536 
537 static int nilfs_iget_test(struct inode *inode, void *opaque)
538 {
539         struct nilfs_iget_args *args = opaque;
540         struct nilfs_inode_info *ii;
541 
542         if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
543                 return 0;
544 
545         ii = NILFS_I(inode);
546         if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
547                 return !args->for_gc;
548 
549         return args->for_gc && args->cno == ii->i_cno;
550 }
551 
552 static int nilfs_iget_set(struct inode *inode, void *opaque)
553 {
554         struct nilfs_iget_args *args = opaque;
555 
556         inode->i_ino = args->ino;
557         if (args->for_gc) {
558                 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
559                 NILFS_I(inode)->i_cno = args->cno;
560                 NILFS_I(inode)->i_root = NULL;
561         } else {
562                 if (args->root && args->ino == NILFS_ROOT_INO)
563                         nilfs_get_root(args->root);
564                 NILFS_I(inode)->i_root = args->root;
565         }
566         return 0;
567 }
568 
569 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
570                             unsigned long ino)
571 {
572         struct nilfs_iget_args args = {
573                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
574         };
575 
576         return ilookup5(sb, ino, nilfs_iget_test, &args);
577 }
578 
579 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
580                                 unsigned long ino)
581 {
582         struct nilfs_iget_args args = {
583                 .ino = ino, .root = root, .cno = 0, .for_gc = 0
584         };
585 
586         return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
587 }
588 
589 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
590                          unsigned long ino)
591 {
592         struct inode *inode;
593         int err;
594 
595         inode = nilfs_iget_locked(sb, root, ino);
596         if (unlikely(!inode))
597                 return ERR_PTR(-ENOMEM);
598         if (!(inode->i_state & I_NEW))
599                 return inode;
600 
601         err = __nilfs_read_inode(sb, root, ino, inode);
602         if (unlikely(err)) {
603                 iget_failed(inode);
604                 return ERR_PTR(err);
605         }
606         unlock_new_inode(inode);
607         return inode;
608 }
609 
610 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
611                                 __u64 cno)
612 {
613         struct nilfs_iget_args args = {
614                 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
615         };
616         struct inode *inode;
617         int err;
618 
619         inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
620         if (unlikely(!inode))
621                 return ERR_PTR(-ENOMEM);
622         if (!(inode->i_state & I_NEW))
623                 return inode;
624 
625         err = nilfs_init_gcinode(inode);
626         if (unlikely(err)) {
627                 iget_failed(inode);
628                 return ERR_PTR(err);
629         }
630         unlock_new_inode(inode);
631         return inode;
632 }
633 
634 void nilfs_write_inode_common(struct inode *inode,
635                               struct nilfs_inode *raw_inode, int has_bmap)
636 {
637         struct nilfs_inode_info *ii = NILFS_I(inode);
638 
639         raw_inode->i_mode = cpu_to_le16(inode->i_mode);
640         raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
641         raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
642         raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
643         raw_inode->i_size = cpu_to_le64(inode->i_size);
644         raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
645         raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
646         raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
647         raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
648         raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
649 
650         raw_inode->i_flags = cpu_to_le32(ii->i_flags);
651         raw_inode->i_generation = cpu_to_le32(inode->i_generation);
652 
653         if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
654                 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
655 
656                 /* zero-fill unused portion in the case of super root block */
657                 raw_inode->i_xattr = 0;
658                 raw_inode->i_pad = 0;
659                 memset((void *)raw_inode + sizeof(*raw_inode), 0,
660                        nilfs->ns_inode_size - sizeof(*raw_inode));
661         }
662 
663         if (has_bmap)
664                 nilfs_bmap_write(ii->i_bmap, raw_inode);
665         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
666                 raw_inode->i_device_code =
667                         cpu_to_le64(huge_encode_dev(inode->i_rdev));
668         /* When extending inode, nilfs->ns_inode_size should be checked
669            for substitutions of appended fields */
670 }
671 
672 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
673 {
674         ino_t ino = inode->i_ino;
675         struct nilfs_inode_info *ii = NILFS_I(inode);
676         struct inode *ifile = ii->i_root->ifile;
677         struct nilfs_inode *raw_inode;
678 
679         raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
680 
681         if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
682                 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
683         if (flags & I_DIRTY_DATASYNC)
684                 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
685 
686         nilfs_write_inode_common(inode, raw_inode, 0);
687                 /* XXX: call with has_bmap = 0 is a workaround to avoid
688                    deadlock of bmap. This delays update of i_bmap to just
689                    before writing */
690         nilfs_ifile_unmap_inode(ifile, ino, ibh);
691 }
692 
693 #define NILFS_MAX_TRUNCATE_BLOCKS       16384  /* 64MB for 4KB block */
694 
695 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
696                                 unsigned long from)
697 {
698         __u64 b;
699         int ret;
700 
701         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
702                 return;
703 repeat:
704         ret = nilfs_bmap_last_key(ii->i_bmap, &b);
705         if (ret == -ENOENT)
706                 return;
707         else if (ret < 0)
708                 goto failed;
709 
710         if (b < from)
711                 return;
712 
713         b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
714         ret = nilfs_bmap_truncate(ii->i_bmap, b);
715         nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
716         if (!ret || (ret == -ENOMEM &&
717                      nilfs_bmap_truncate(ii->i_bmap, b) == 0))
718                 goto repeat;
719 
720 failed:
721         nilfs_warning(ii->vfs_inode.i_sb, __func__,
722                       "failed to truncate bmap (ino=%lu, err=%d)",
723                       ii->vfs_inode.i_ino, ret);
724 }
725 
726 void nilfs_truncate(struct inode *inode)
727 {
728         unsigned long blkoff;
729         unsigned int blocksize;
730         struct nilfs_transaction_info ti;
731         struct super_block *sb = inode->i_sb;
732         struct nilfs_inode_info *ii = NILFS_I(inode);
733 
734         if (!test_bit(NILFS_I_BMAP, &ii->i_state))
735                 return;
736         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
737                 return;
738 
739         blocksize = sb->s_blocksize;
740         blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
741         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
742 
743         block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
744 
745         nilfs_truncate_bmap(ii, blkoff);
746 
747         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
748         if (IS_SYNC(inode))
749                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
750 
751         nilfs_mark_inode_dirty(inode);
752         nilfs_set_file_dirty(inode, 0);
753         nilfs_transaction_commit(sb);
754         /* May construct a logical segment and may fail in sync mode.
755            But truncate has no return value. */
756 }
757 
758 static void nilfs_clear_inode(struct inode *inode)
759 {
760         struct nilfs_inode_info *ii = NILFS_I(inode);
761         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
762 
763         /*
764          * Free resources allocated in nilfs_read_inode(), here.
765          */
766         BUG_ON(!list_empty(&ii->i_dirty));
767         brelse(ii->i_bh);
768         ii->i_bh = NULL;
769 
770         if (mdi && mdi->mi_palloc_cache)
771                 nilfs_palloc_destroy_cache(inode);
772 
773         if (test_bit(NILFS_I_BMAP, &ii->i_state))
774                 nilfs_bmap_clear(ii->i_bmap);
775 
776         nilfs_btnode_cache_clear(&ii->i_btnode_cache);
777 
778         if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
779                 nilfs_put_root(ii->i_root);
780 }
781 
782 void nilfs_evict_inode(struct inode *inode)
783 {
784         struct nilfs_transaction_info ti;
785         struct super_block *sb = inode->i_sb;
786         struct nilfs_inode_info *ii = NILFS_I(inode);
787         int ret;
788 
789         if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
790                 truncate_inode_pages_final(&inode->i_data);
791                 clear_inode(inode);
792                 nilfs_clear_inode(inode);
793                 return;
794         }
795         nilfs_transaction_begin(sb, &ti, 0); /* never fails */
796 
797         truncate_inode_pages_final(&inode->i_data);
798 
799         /* TODO: some of the following operations may fail.  */
800         nilfs_truncate_bmap(ii, 0);
801         nilfs_mark_inode_dirty(inode);
802         clear_inode(inode);
803 
804         ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
805         if (!ret)
806                 atomic64_dec(&ii->i_root->inodes_count);
807 
808         nilfs_clear_inode(inode);
809 
810         if (IS_SYNC(inode))
811                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
812         nilfs_transaction_commit(sb);
813         /* May construct a logical segment and may fail in sync mode.
814            But delete_inode has no return value. */
815 }
816 
817 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
818 {
819         struct nilfs_transaction_info ti;
820         struct inode *inode = d_inode(dentry);
821         struct super_block *sb = inode->i_sb;
822         int err;
823 
824         err = inode_change_ok(inode, iattr);
825         if (err)
826                 return err;
827 
828         err = nilfs_transaction_begin(sb, &ti, 0);
829         if (unlikely(err))
830                 return err;
831 
832         if ((iattr->ia_valid & ATTR_SIZE) &&
833             iattr->ia_size != i_size_read(inode)) {
834                 inode_dio_wait(inode);
835                 truncate_setsize(inode, iattr->ia_size);
836                 nilfs_truncate(inode);
837         }
838 
839         setattr_copy(inode, iattr);
840         mark_inode_dirty(inode);
841 
842         if (iattr->ia_valid & ATTR_MODE) {
843                 err = nilfs_acl_chmod(inode);
844                 if (unlikely(err))
845                         goto out_err;
846         }
847 
848         return nilfs_transaction_commit(sb);
849 
850 out_err:
851         nilfs_transaction_abort(sb);
852         return err;
853 }
854 
855 int nilfs_permission(struct inode *inode, int mask)
856 {
857         struct nilfs_root *root = NILFS_I(inode)->i_root;
858         if ((mask & MAY_WRITE) && root &&
859             root->cno != NILFS_CPTREE_CURRENT_CNO)
860                 return -EROFS; /* snapshot is not writable */
861 
862         return generic_permission(inode, mask);
863 }
864 
865 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
866 {
867         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
868         struct nilfs_inode_info *ii = NILFS_I(inode);
869         int err;
870 
871         spin_lock(&nilfs->ns_inode_lock);
872         if (ii->i_bh == NULL) {
873                 spin_unlock(&nilfs->ns_inode_lock);
874                 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
875                                                   inode->i_ino, pbh);
876                 if (unlikely(err))
877                         return err;
878                 spin_lock(&nilfs->ns_inode_lock);
879                 if (ii->i_bh == NULL)
880                         ii->i_bh = *pbh;
881                 else {
882                         brelse(*pbh);
883                         *pbh = ii->i_bh;
884                 }
885         } else
886                 *pbh = ii->i_bh;
887 
888         get_bh(*pbh);
889         spin_unlock(&nilfs->ns_inode_lock);
890         return 0;
891 }
892 
893 int nilfs_inode_dirty(struct inode *inode)
894 {
895         struct nilfs_inode_info *ii = NILFS_I(inode);
896         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
897         int ret = 0;
898 
899         if (!list_empty(&ii->i_dirty)) {
900                 spin_lock(&nilfs->ns_inode_lock);
901                 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
902                         test_bit(NILFS_I_BUSY, &ii->i_state);
903                 spin_unlock(&nilfs->ns_inode_lock);
904         }
905         return ret;
906 }
907 
908 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
909 {
910         struct nilfs_inode_info *ii = NILFS_I(inode);
911         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
912 
913         atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
914 
915         if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
916                 return 0;
917 
918         spin_lock(&nilfs->ns_inode_lock);
919         if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
920             !test_bit(NILFS_I_BUSY, &ii->i_state)) {
921                 /* Because this routine may race with nilfs_dispose_list(),
922                    we have to check NILFS_I_QUEUED here, too. */
923                 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
924                         /* This will happen when somebody is freeing
925                            this inode. */
926                         nilfs_warning(inode->i_sb, __func__,
927                                       "cannot get inode (ino=%lu)\n",
928                                       inode->i_ino);
929                         spin_unlock(&nilfs->ns_inode_lock);
930                         return -EINVAL; /* NILFS_I_DIRTY may remain for
931                                            freeing inode */
932                 }
933                 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
934                 set_bit(NILFS_I_QUEUED, &ii->i_state);
935         }
936         spin_unlock(&nilfs->ns_inode_lock);
937         return 0;
938 }
939 
940 int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
941 {
942         struct buffer_head *ibh;
943         int err;
944 
945         err = nilfs_load_inode_block(inode, &ibh);
946         if (unlikely(err)) {
947                 nilfs_warning(inode->i_sb, __func__,
948                               "failed to reget inode block.\n");
949                 return err;
950         }
951         nilfs_update_inode(inode, ibh, flags);
952         mark_buffer_dirty(ibh);
953         nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
954         brelse(ibh);
955         return 0;
956 }
957 
958 /**
959  * nilfs_dirty_inode - reflect changes on given inode to an inode block.
960  * @inode: inode of the file to be registered.
961  *
962  * nilfs_dirty_inode() loads a inode block containing the specified
963  * @inode and copies data from a nilfs_inode to a corresponding inode
964  * entry in the inode block. This operation is excluded from the segment
965  * construction. This function can be called both as a single operation
966  * and as a part of indivisible file operations.
967  */
968 void nilfs_dirty_inode(struct inode *inode, int flags)
969 {
970         struct nilfs_transaction_info ti;
971         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
972 
973         if (is_bad_inode(inode)) {
974                 nilfs_warning(inode->i_sb, __func__,
975                               "tried to mark bad_inode dirty. ignored.\n");
976                 dump_stack();
977                 return;
978         }
979         if (mdi) {
980                 nilfs_mdt_mark_dirty(inode);
981                 return;
982         }
983         nilfs_transaction_begin(inode->i_sb, &ti, 0);
984         __nilfs_mark_inode_dirty(inode, flags);
985         nilfs_transaction_commit(inode->i_sb); /* never fails */
986 }
987 
988 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
989                  __u64 start, __u64 len)
990 {
991         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
992         __u64 logical = 0, phys = 0, size = 0;
993         __u32 flags = 0;
994         loff_t isize;
995         sector_t blkoff, end_blkoff;
996         sector_t delalloc_blkoff;
997         unsigned long delalloc_blklen;
998         unsigned int blkbits = inode->i_blkbits;
999         int ret, n;
1000 
1001         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1002         if (ret)
1003                 return ret;
1004 
1005         mutex_lock(&inode->i_mutex);
1006 
1007         isize = i_size_read(inode);
1008 
1009         blkoff = start >> blkbits;
1010         end_blkoff = (start + len - 1) >> blkbits;
1011 
1012         delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1013                                                         &delalloc_blkoff);
1014 
1015         do {
1016                 __u64 blkphy;
1017                 unsigned int maxblocks;
1018 
1019                 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1020                         if (size) {
1021                                 /* End of the current extent */
1022                                 ret = fiemap_fill_next_extent(
1023                                         fieinfo, logical, phys, size, flags);
1024                                 if (ret)
1025                                         break;
1026                         }
1027                         if (blkoff > end_blkoff)
1028                                 break;
1029 
1030                         flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1031                         logical = blkoff << blkbits;
1032                         phys = 0;
1033                         size = delalloc_blklen << blkbits;
1034 
1035                         blkoff = delalloc_blkoff + delalloc_blklen;
1036                         delalloc_blklen = nilfs_find_uncommitted_extent(
1037                                 inode, blkoff, &delalloc_blkoff);
1038                         continue;
1039                 }
1040 
1041                 /*
1042                  * Limit the number of blocks that we look up so as
1043                  * not to get into the next delayed allocation extent.
1044                  */
1045                 maxblocks = INT_MAX;
1046                 if (delalloc_blklen)
1047                         maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1048                                           maxblocks);
1049                 blkphy = 0;
1050 
1051                 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1052                 n = nilfs_bmap_lookup_contig(
1053                         NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1054                 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1055 
1056                 if (n < 0) {
1057                         int past_eof;
1058 
1059                         if (unlikely(n != -ENOENT))
1060                                 break; /* error */
1061 
1062                         /* HOLE */
1063                         blkoff++;
1064                         past_eof = ((blkoff << blkbits) >= isize);
1065 
1066                         if (size) {
1067                                 /* End of the current extent */
1068 
1069                                 if (past_eof)
1070                                         flags |= FIEMAP_EXTENT_LAST;
1071 
1072                                 ret = fiemap_fill_next_extent(
1073                                         fieinfo, logical, phys, size, flags);
1074                                 if (ret)
1075                                         break;
1076                                 size = 0;
1077                         }
1078                         if (blkoff > end_blkoff || past_eof)
1079                                 break;
1080                 } else {
1081                         if (size) {
1082                                 if (phys && blkphy << blkbits == phys + size) {
1083                                         /* The current extent goes on */
1084                                         size += n << blkbits;
1085                                 } else {
1086                                         /* Terminate the current extent */
1087                                         ret = fiemap_fill_next_extent(
1088                                                 fieinfo, logical, phys, size,
1089                                                 flags);
1090                                         if (ret || blkoff > end_blkoff)
1091                                                 break;
1092 
1093                                         /* Start another extent */
1094                                         flags = FIEMAP_EXTENT_MERGED;
1095                                         logical = blkoff << blkbits;
1096                                         phys = blkphy << blkbits;
1097                                         size = n << blkbits;
1098                                 }
1099                         } else {
1100                                 /* Start a new extent */
1101                                 flags = FIEMAP_EXTENT_MERGED;
1102                                 logical = blkoff << blkbits;
1103                                 phys = blkphy << blkbits;
1104                                 size = n << blkbits;
1105                         }
1106                         blkoff += n;
1107                 }
1108                 cond_resched();
1109         } while (true);
1110 
1111         /* If ret is 1 then we just hit the end of the extent array */
1112         if (ret == 1)
1113                 ret = 0;
1114 
1115         mutex_unlock(&inode->i_mutex);
1116         return ret;
1117 }
1118 

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