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Linux/fs/hfs/inode.c

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  1 /*
  2  *  linux/fs/hfs/inode.c
  3  *
  4  * Copyright (C) 1995-1997  Paul H. Hargrove
  5  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  6  * This file may be distributed under the terms of the GNU General Public License.
  7  *
  8  * This file contains inode-related functions which do not depend on
  9  * which scheme is being used to represent forks.
 10  *
 11  * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 12  */
 13 
 14 #include <linux/pagemap.h>
 15 #include <linux/mpage.h>
 16 #include <linux/sched.h>
 17 #include <linux/cred.h>
 18 #include <linux/uio.h>
 19 #include <linux/xattr.h>
 20 
 21 #include "hfs_fs.h"
 22 #include "btree.h"
 23 
 24 static const struct file_operations hfs_file_operations;
 25 static const struct inode_operations hfs_file_inode_operations;
 26 
 27 /*================ Variable-like macros ================*/
 28 
 29 #define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
 30 
 31 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
 32 {
 33         return block_write_full_page(page, hfs_get_block, wbc);
 34 }
 35 
 36 static int hfs_readpage(struct file *file, struct page *page)
 37 {
 38         return block_read_full_page(page, hfs_get_block);
 39 }
 40 
 41 static void hfs_write_failed(struct address_space *mapping, loff_t to)
 42 {
 43         struct inode *inode = mapping->host;
 44 
 45         if (to > inode->i_size) {
 46                 truncate_pagecache(inode, inode->i_size);
 47                 hfs_file_truncate(inode);
 48         }
 49 }
 50 
 51 static int hfs_write_begin(struct file *file, struct address_space *mapping,
 52                         loff_t pos, unsigned len, unsigned flags,
 53                         struct page **pagep, void **fsdata)
 54 {
 55         int ret;
 56 
 57         *pagep = NULL;
 58         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 59                                 hfs_get_block,
 60                                 &HFS_I(mapping->host)->phys_size);
 61         if (unlikely(ret))
 62                 hfs_write_failed(mapping, pos + len);
 63 
 64         return ret;
 65 }
 66 
 67 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
 68 {
 69         return generic_block_bmap(mapping, block, hfs_get_block);
 70 }
 71 
 72 static int hfs_releasepage(struct page *page, gfp_t mask)
 73 {
 74         struct inode *inode = page->mapping->host;
 75         struct super_block *sb = inode->i_sb;
 76         struct hfs_btree *tree;
 77         struct hfs_bnode *node;
 78         u32 nidx;
 79         int i, res = 1;
 80 
 81         switch (inode->i_ino) {
 82         case HFS_EXT_CNID:
 83                 tree = HFS_SB(sb)->ext_tree;
 84                 break;
 85         case HFS_CAT_CNID:
 86                 tree = HFS_SB(sb)->cat_tree;
 87                 break;
 88         default:
 89                 BUG();
 90                 return 0;
 91         }
 92 
 93         if (!tree)
 94                 return 0;
 95 
 96         if (tree->node_size >= PAGE_SIZE) {
 97                 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
 98                 spin_lock(&tree->hash_lock);
 99                 node = hfs_bnode_findhash(tree, nidx);
100                 if (!node)
101                         ;
102                 else if (atomic_read(&node->refcnt))
103                         res = 0;
104                 if (res && node) {
105                         hfs_bnode_unhash(node);
106                         hfs_bnode_free(node);
107                 }
108                 spin_unlock(&tree->hash_lock);
109         } else {
110                 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
111                 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
112                 spin_lock(&tree->hash_lock);
113                 do {
114                         node = hfs_bnode_findhash(tree, nidx++);
115                         if (!node)
116                                 continue;
117                         if (atomic_read(&node->refcnt)) {
118                                 res = 0;
119                                 break;
120                         }
121                         hfs_bnode_unhash(node);
122                         hfs_bnode_free(node);
123                 } while (--i && nidx < tree->node_count);
124                 spin_unlock(&tree->hash_lock);
125         }
126         return res ? try_to_free_buffers(page) : 0;
127 }
128 
129 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
130 {
131         struct file *file = iocb->ki_filp;
132         struct address_space *mapping = file->f_mapping;
133         struct inode *inode = mapping->host;
134         size_t count = iov_iter_count(iter);
135         ssize_t ret;
136 
137         ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
138 
139         /*
140          * In case of error extending write may have instantiated a few
141          * blocks outside i_size. Trim these off again.
142          */
143         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
144                 loff_t isize = i_size_read(inode);
145                 loff_t end = iocb->ki_pos + count;
146 
147                 if (end > isize)
148                         hfs_write_failed(mapping, end);
149         }
150 
151         return ret;
152 }
153 
154 static int hfs_writepages(struct address_space *mapping,
155                           struct writeback_control *wbc)
156 {
157         return mpage_writepages(mapping, wbc, hfs_get_block);
158 }
159 
160 const struct address_space_operations hfs_btree_aops = {
161         .readpage       = hfs_readpage,
162         .writepage      = hfs_writepage,
163         .write_begin    = hfs_write_begin,
164         .write_end      = generic_write_end,
165         .bmap           = hfs_bmap,
166         .releasepage    = hfs_releasepage,
167 };
168 
169 const struct address_space_operations hfs_aops = {
170         .readpage       = hfs_readpage,
171         .writepage      = hfs_writepage,
172         .write_begin    = hfs_write_begin,
173         .write_end      = generic_write_end,
174         .bmap           = hfs_bmap,
175         .direct_IO      = hfs_direct_IO,
176         .writepages     = hfs_writepages,
177 };
178 
179 /*
180  * hfs_new_inode
181  */
182 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
183 {
184         struct super_block *sb = dir->i_sb;
185         struct inode *inode = new_inode(sb);
186         if (!inode)
187                 return NULL;
188 
189         mutex_init(&HFS_I(inode)->extents_lock);
190         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
191         spin_lock_init(&HFS_I(inode)->open_dir_lock);
192         hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
193         inode->i_ino = HFS_SB(sb)->next_id++;
194         inode->i_mode = mode;
195         inode->i_uid = current_fsuid();
196         inode->i_gid = current_fsgid();
197         set_nlink(inode, 1);
198         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
199         HFS_I(inode)->flags = 0;
200         HFS_I(inode)->rsrc_inode = NULL;
201         HFS_I(inode)->fs_blocks = 0;
202         if (S_ISDIR(mode)) {
203                 inode->i_size = 2;
204                 HFS_SB(sb)->folder_count++;
205                 if (dir->i_ino == HFS_ROOT_CNID)
206                         HFS_SB(sb)->root_dirs++;
207                 inode->i_op = &hfs_dir_inode_operations;
208                 inode->i_fop = &hfs_dir_operations;
209                 inode->i_mode |= S_IRWXUGO;
210                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
211         } else if (S_ISREG(mode)) {
212                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
213                 HFS_SB(sb)->file_count++;
214                 if (dir->i_ino == HFS_ROOT_CNID)
215                         HFS_SB(sb)->root_files++;
216                 inode->i_op = &hfs_file_inode_operations;
217                 inode->i_fop = &hfs_file_operations;
218                 inode->i_mapping->a_ops = &hfs_aops;
219                 inode->i_mode |= S_IRUGO|S_IXUGO;
220                 if (mode & S_IWUSR)
221                         inode->i_mode |= S_IWUGO;
222                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
223                 HFS_I(inode)->phys_size = 0;
224                 HFS_I(inode)->alloc_blocks = 0;
225                 HFS_I(inode)->first_blocks = 0;
226                 HFS_I(inode)->cached_start = 0;
227                 HFS_I(inode)->cached_blocks = 0;
228                 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
229                 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
230         }
231         insert_inode_hash(inode);
232         mark_inode_dirty(inode);
233         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
234         hfs_mark_mdb_dirty(sb);
235 
236         return inode;
237 }
238 
239 void hfs_delete_inode(struct inode *inode)
240 {
241         struct super_block *sb = inode->i_sb;
242 
243         hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
244         if (S_ISDIR(inode->i_mode)) {
245                 HFS_SB(sb)->folder_count--;
246                 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
247                         HFS_SB(sb)->root_dirs--;
248                 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
249                 hfs_mark_mdb_dirty(sb);
250                 return;
251         }
252         HFS_SB(sb)->file_count--;
253         if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
254                 HFS_SB(sb)->root_files--;
255         if (S_ISREG(inode->i_mode)) {
256                 if (!inode->i_nlink) {
257                         inode->i_size = 0;
258                         hfs_file_truncate(inode);
259                 }
260         }
261         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
262         hfs_mark_mdb_dirty(sb);
263 }
264 
265 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
266                          __be32 __log_size, __be32 phys_size, u32 clump_size)
267 {
268         struct super_block *sb = inode->i_sb;
269         u32 log_size = be32_to_cpu(__log_size);
270         u16 count;
271         int i;
272 
273         memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
274         for (count = 0, i = 0; i < 3; i++)
275                 count += be16_to_cpu(ext[i].count);
276         HFS_I(inode)->first_blocks = count;
277 
278         inode->i_size = HFS_I(inode)->phys_size = log_size;
279         HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
280         inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
281         HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
282                                      HFS_SB(sb)->alloc_blksz;
283         HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
284         if (!HFS_I(inode)->clump_blocks)
285                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
286 }
287 
288 struct hfs_iget_data {
289         struct hfs_cat_key *key;
290         hfs_cat_rec *rec;
291 };
292 
293 static int hfs_test_inode(struct inode *inode, void *data)
294 {
295         struct hfs_iget_data *idata = data;
296         hfs_cat_rec *rec;
297 
298         rec = idata->rec;
299         switch (rec->type) {
300         case HFS_CDR_DIR:
301                 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
302         case HFS_CDR_FIL:
303                 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
304         default:
305                 BUG();
306                 return 1;
307         }
308 }
309 
310 /*
311  * hfs_read_inode
312  */
313 static int hfs_read_inode(struct inode *inode, void *data)
314 {
315         struct hfs_iget_data *idata = data;
316         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
317         hfs_cat_rec *rec;
318 
319         HFS_I(inode)->flags = 0;
320         HFS_I(inode)->rsrc_inode = NULL;
321         mutex_init(&HFS_I(inode)->extents_lock);
322         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
323         spin_lock_init(&HFS_I(inode)->open_dir_lock);
324 
325         /* Initialize the inode */
326         inode->i_uid = hsb->s_uid;
327         inode->i_gid = hsb->s_gid;
328         set_nlink(inode, 1);
329 
330         if (idata->key)
331                 HFS_I(inode)->cat_key = *idata->key;
332         else
333                 HFS_I(inode)->flags |= HFS_FLG_RSRC;
334         HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
335 
336         rec = idata->rec;
337         switch (rec->type) {
338         case HFS_CDR_FIL:
339                 if (!HFS_IS_RSRC(inode)) {
340                         hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
341                                             rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
342                 } else {
343                         hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
344                                             rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
345                 }
346 
347                 inode->i_ino = be32_to_cpu(rec->file.FlNum);
348                 inode->i_mode = S_IRUGO | S_IXUGO;
349                 if (!(rec->file.Flags & HFS_FIL_LOCK))
350                         inode->i_mode |= S_IWUGO;
351                 inode->i_mode &= ~hsb->s_file_umask;
352                 inode->i_mode |= S_IFREG;
353                 inode->i_ctime = inode->i_atime = inode->i_mtime =
354                                 hfs_m_to_utime(rec->file.MdDat);
355                 inode->i_op = &hfs_file_inode_operations;
356                 inode->i_fop = &hfs_file_operations;
357                 inode->i_mapping->a_ops = &hfs_aops;
358                 break;
359         case HFS_CDR_DIR:
360                 inode->i_ino = be32_to_cpu(rec->dir.DirID);
361                 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
362                 HFS_I(inode)->fs_blocks = 0;
363                 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
364                 inode->i_ctime = inode->i_atime = inode->i_mtime =
365                                 hfs_m_to_utime(rec->dir.MdDat);
366                 inode->i_op = &hfs_dir_inode_operations;
367                 inode->i_fop = &hfs_dir_operations;
368                 break;
369         default:
370                 make_bad_inode(inode);
371         }
372         return 0;
373 }
374 
375 /*
376  * __hfs_iget()
377  *
378  * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
379  * the catalog B-tree and the 'type' of the desired file return the
380  * inode for that file/directory or NULL.  Note that 'type' indicates
381  * whether we want the actual file or directory, or the corresponding
382  * metadata (AppleDouble header file or CAP metadata file).
383  */
384 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
385 {
386         struct hfs_iget_data data = { key, rec };
387         struct inode *inode;
388         u32 cnid;
389 
390         switch (rec->type) {
391         case HFS_CDR_DIR:
392                 cnid = be32_to_cpu(rec->dir.DirID);
393                 break;
394         case HFS_CDR_FIL:
395                 cnid = be32_to_cpu(rec->file.FlNum);
396                 break;
397         default:
398                 return NULL;
399         }
400         inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
401         if (inode && (inode->i_state & I_NEW))
402                 unlock_new_inode(inode);
403         return inode;
404 }
405 
406 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
407                           __be32 *log_size, __be32 *phys_size)
408 {
409         memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
410 
411         if (log_size)
412                 *log_size = cpu_to_be32(inode->i_size);
413         if (phys_size)
414                 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
415                                          HFS_SB(inode->i_sb)->alloc_blksz);
416 }
417 
418 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
419 {
420         struct inode *main_inode = inode;
421         struct hfs_find_data fd;
422         hfs_cat_rec rec;
423         int res;
424 
425         hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
426         res = hfs_ext_write_extent(inode);
427         if (res)
428                 return res;
429 
430         if (inode->i_ino < HFS_FIRSTUSER_CNID) {
431                 switch (inode->i_ino) {
432                 case HFS_ROOT_CNID:
433                         break;
434                 case HFS_EXT_CNID:
435                         hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
436                         return 0;
437                 case HFS_CAT_CNID:
438                         hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
439                         return 0;
440                 default:
441                         BUG();
442                         return -EIO;
443                 }
444         }
445 
446         if (HFS_IS_RSRC(inode))
447                 main_inode = HFS_I(inode)->rsrc_inode;
448 
449         if (!main_inode->i_nlink)
450                 return 0;
451 
452         if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
453                 /* panic? */
454                 return -EIO;
455 
456         fd.search_key->cat = HFS_I(main_inode)->cat_key;
457         if (hfs_brec_find(&fd))
458                 /* panic? */
459                 goto out;
460 
461         if (S_ISDIR(main_inode->i_mode)) {
462                 if (fd.entrylength < sizeof(struct hfs_cat_dir))
463                         /* panic? */;
464                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
465                            sizeof(struct hfs_cat_dir));
466                 if (rec.type != HFS_CDR_DIR ||
467                     be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
468                 }
469 
470                 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
471                 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
472 
473                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
474                             sizeof(struct hfs_cat_dir));
475         } else if (HFS_IS_RSRC(inode)) {
476                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
477                                sizeof(struct hfs_cat_file));
478                 hfs_inode_write_fork(inode, rec.file.RExtRec,
479                                      &rec.file.RLgLen, &rec.file.RPyLen);
480                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
481                                 sizeof(struct hfs_cat_file));
482         } else {
483                 if (fd.entrylength < sizeof(struct hfs_cat_file))
484                         /* panic? */;
485                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
486                            sizeof(struct hfs_cat_file));
487                 if (rec.type != HFS_CDR_FIL ||
488                     be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
489                 }
490 
491                 if (inode->i_mode & S_IWUSR)
492                         rec.file.Flags &= ~HFS_FIL_LOCK;
493                 else
494                         rec.file.Flags |= HFS_FIL_LOCK;
495                 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
496                 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
497 
498                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
499                             sizeof(struct hfs_cat_file));
500         }
501 out:
502         hfs_find_exit(&fd);
503         return 0;
504 }
505 
506 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
507                                       unsigned int flags)
508 {
509         struct inode *inode = NULL;
510         hfs_cat_rec rec;
511         struct hfs_find_data fd;
512         int res;
513 
514         if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
515                 goto out;
516 
517         inode = HFS_I(dir)->rsrc_inode;
518         if (inode)
519                 goto out;
520 
521         inode = new_inode(dir->i_sb);
522         if (!inode)
523                 return ERR_PTR(-ENOMEM);
524 
525         res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
526         if (res) {
527                 iput(inode);
528                 return ERR_PTR(res);
529         }
530         fd.search_key->cat = HFS_I(dir)->cat_key;
531         res = hfs_brec_read(&fd, &rec, sizeof(rec));
532         if (!res) {
533                 struct hfs_iget_data idata = { NULL, &rec };
534                 hfs_read_inode(inode, &idata);
535         }
536         hfs_find_exit(&fd);
537         if (res) {
538                 iput(inode);
539                 return ERR_PTR(res);
540         }
541         HFS_I(inode)->rsrc_inode = dir;
542         HFS_I(dir)->rsrc_inode = inode;
543         igrab(dir);
544         hlist_add_fake(&inode->i_hash);
545         mark_inode_dirty(inode);
546 out:
547         d_add(dentry, inode);
548         return NULL;
549 }
550 
551 void hfs_evict_inode(struct inode *inode)
552 {
553         truncate_inode_pages_final(&inode->i_data);
554         clear_inode(inode);
555         if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
556                 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
557                 iput(HFS_I(inode)->rsrc_inode);
558         }
559 }
560 
561 static int hfs_file_open(struct inode *inode, struct file *file)
562 {
563         if (HFS_IS_RSRC(inode))
564                 inode = HFS_I(inode)->rsrc_inode;
565         atomic_inc(&HFS_I(inode)->opencnt);
566         return 0;
567 }
568 
569 static int hfs_file_release(struct inode *inode, struct file *file)
570 {
571         //struct super_block *sb = inode->i_sb;
572 
573         if (HFS_IS_RSRC(inode))
574                 inode = HFS_I(inode)->rsrc_inode;
575         if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
576                 inode_lock(inode);
577                 hfs_file_truncate(inode);
578                 //if (inode->i_flags & S_DEAD) {
579                 //      hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
580                 //      hfs_delete_inode(inode);
581                 //}
582                 inode_unlock(inode);
583         }
584         return 0;
585 }
586 
587 /*
588  * hfs_notify_change()
589  *
590  * Based very closely on fs/msdos/inode.c by Werner Almesberger
591  *
592  * This is the notify_change() field in the super_operations structure
593  * for HFS file systems.  The purpose is to take that changes made to
594  * an inode and apply then in a filesystem-dependent manner.  In this
595  * case the process has a few of tasks to do:
596  *  1) prevent changes to the i_uid and i_gid fields.
597  *  2) map file permissions to the closest allowable permissions
598  *  3) Since multiple Linux files can share the same on-disk inode under
599  *     HFS (for instance the data and resource forks of a file) a change
600  *     to permissions must be applied to all other in-core inodes which
601  *     correspond to the same HFS file.
602  */
603 
604 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
605 {
606         struct inode *inode = d_inode(dentry);
607         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
608         int error;
609 
610         error = setattr_prepare(dentry, attr); /* basic permission checks */
611         if (error)
612                 return error;
613 
614         /* no uig/gid changes and limit which mode bits can be set */
615         if (((attr->ia_valid & ATTR_UID) &&
616              (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
617             ((attr->ia_valid & ATTR_GID) &&
618              (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
619             ((attr->ia_valid & ATTR_MODE) &&
620              ((S_ISDIR(inode->i_mode) &&
621                (attr->ia_mode != inode->i_mode)) ||
622               (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
623                 return hsb->s_quiet ? 0 : error;
624         }
625 
626         if (attr->ia_valid & ATTR_MODE) {
627                 /* Only the 'w' bits can ever change and only all together. */
628                 if (attr->ia_mode & S_IWUSR)
629                         attr->ia_mode = inode->i_mode | S_IWUGO;
630                 else
631                         attr->ia_mode = inode->i_mode & ~S_IWUGO;
632                 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
633         }
634 
635         if ((attr->ia_valid & ATTR_SIZE) &&
636             attr->ia_size != i_size_read(inode)) {
637                 inode_dio_wait(inode);
638 
639                 error = inode_newsize_ok(inode, attr->ia_size);
640                 if (error)
641                         return error;
642 
643                 truncate_setsize(inode, attr->ia_size);
644                 hfs_file_truncate(inode);
645         }
646 
647         setattr_copy(inode, attr);
648         mark_inode_dirty(inode);
649         return 0;
650 }
651 
652 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
653                           int datasync)
654 {
655         struct inode *inode = filp->f_mapping->host;
656         struct super_block * sb;
657         int ret, err;
658 
659         ret = file_write_and_wait_range(filp, start, end);
660         if (ret)
661                 return ret;
662         inode_lock(inode);
663 
664         /* sync the inode to buffers */
665         ret = write_inode_now(inode, 0);
666 
667         /* sync the superblock to buffers */
668         sb = inode->i_sb;
669         flush_delayed_work(&HFS_SB(sb)->mdb_work);
670         /* .. finally sync the buffers to disk */
671         err = sync_blockdev(sb->s_bdev);
672         if (!ret)
673                 ret = err;
674         inode_unlock(inode);
675         return ret;
676 }
677 
678 static const struct file_operations hfs_file_operations = {
679         .llseek         = generic_file_llseek,
680         .read_iter      = generic_file_read_iter,
681         .write_iter     = generic_file_write_iter,
682         .mmap           = generic_file_mmap,
683         .splice_read    = generic_file_splice_read,
684         .fsync          = hfs_file_fsync,
685         .open           = hfs_file_open,
686         .release        = hfs_file_release,
687 };
688 
689 static const struct inode_operations hfs_file_inode_operations = {
690         .lookup         = hfs_file_lookup,
691         .setattr        = hfs_inode_setattr,
692         .listxattr      = generic_listxattr,
693 };
694 

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