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

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