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Linux/fs/minix/inode.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  linux/fs/minix/inode.c
  4  *
  5  *  Copyright (C) 1991, 1992  Linus Torvalds
  6  *
  7  *  Copyright (C) 1996  Gertjan van Wingerde
  8  *      Minix V2 fs support.
  9  *
 10  *  Modified for 680x0 by Andreas Schwab
 11  *  Updated to filesystem version 3 by Daniel Aragones
 12  */
 13 
 14 #include <linux/module.h>
 15 #include "minix.h"
 16 #include <linux/buffer_head.h>
 17 #include <linux/slab.h>
 18 #include <linux/init.h>
 19 #include <linux/highuid.h>
 20 #include <linux/vfs.h>
 21 #include <linux/writeback.h>
 22 
 23 static int minix_write_inode(struct inode *inode,
 24                 struct writeback_control *wbc);
 25 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
 26 static int minix_remount (struct super_block * sb, int * flags, char * data);
 27 
 28 static void minix_evict_inode(struct inode *inode)
 29 {
 30         truncate_inode_pages_final(&inode->i_data);
 31         if (!inode->i_nlink) {
 32                 inode->i_size = 0;
 33                 minix_truncate(inode);
 34         }
 35         invalidate_inode_buffers(inode);
 36         clear_inode(inode);
 37         if (!inode->i_nlink)
 38                 minix_free_inode(inode);
 39 }
 40 
 41 static void minix_put_super(struct super_block *sb)
 42 {
 43         int i;
 44         struct minix_sb_info *sbi = minix_sb(sb);
 45 
 46         if (!sb_rdonly(sb)) {
 47                 if (sbi->s_version != MINIX_V3)  /* s_state is now out from V3 sb */
 48                         sbi->s_ms->s_state = sbi->s_mount_state;
 49                 mark_buffer_dirty(sbi->s_sbh);
 50         }
 51         for (i = 0; i < sbi->s_imap_blocks; i++)
 52                 brelse(sbi->s_imap[i]);
 53         for (i = 0; i < sbi->s_zmap_blocks; i++)
 54                 brelse(sbi->s_zmap[i]);
 55         brelse (sbi->s_sbh);
 56         kfree(sbi->s_imap);
 57         sb->s_fs_info = NULL;
 58         kfree(sbi);
 59 }
 60 
 61 static struct kmem_cache * minix_inode_cachep;
 62 
 63 static struct inode *minix_alloc_inode(struct super_block *sb)
 64 {
 65         struct minix_inode_info *ei;
 66         ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
 67         if (!ei)
 68                 return NULL;
 69         return &ei->vfs_inode;
 70 }
 71 
 72 static void minix_free_in_core_inode(struct inode *inode)
 73 {
 74         kmem_cache_free(minix_inode_cachep, minix_i(inode));
 75 }
 76 
 77 static void init_once(void *foo)
 78 {
 79         struct minix_inode_info *ei = (struct minix_inode_info *) foo;
 80 
 81         inode_init_once(&ei->vfs_inode);
 82 }
 83 
 84 static int __init init_inodecache(void)
 85 {
 86         minix_inode_cachep = kmem_cache_create("minix_inode_cache",
 87                                              sizeof(struct minix_inode_info),
 88                                              0, (SLAB_RECLAIM_ACCOUNT|
 89                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 90                                              init_once);
 91         if (minix_inode_cachep == NULL)
 92                 return -ENOMEM;
 93         return 0;
 94 }
 95 
 96 static void destroy_inodecache(void)
 97 {
 98         /*
 99          * Make sure all delayed rcu free inodes are flushed before we
100          * destroy cache.
101          */
102         rcu_barrier();
103         kmem_cache_destroy(minix_inode_cachep);
104 }
105 
106 static const struct super_operations minix_sops = {
107         .alloc_inode    = minix_alloc_inode,
108         .free_inode     = minix_free_in_core_inode,
109         .write_inode    = minix_write_inode,
110         .evict_inode    = minix_evict_inode,
111         .put_super      = minix_put_super,
112         .statfs         = minix_statfs,
113         .remount_fs     = minix_remount,
114 };
115 
116 static int minix_remount (struct super_block * sb, int * flags, char * data)
117 {
118         struct minix_sb_info * sbi = minix_sb(sb);
119         struct minix_super_block * ms;
120 
121         sync_filesystem(sb);
122         ms = sbi->s_ms;
123         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
124                 return 0;
125         if (*flags & SB_RDONLY) {
126                 if (ms->s_state & MINIX_VALID_FS ||
127                     !(sbi->s_mount_state & MINIX_VALID_FS))
128                         return 0;
129                 /* Mounting a rw partition read-only. */
130                 if (sbi->s_version != MINIX_V3)
131                         ms->s_state = sbi->s_mount_state;
132                 mark_buffer_dirty(sbi->s_sbh);
133         } else {
134                 /* Mount a partition which is read-only, read-write. */
135                 if (sbi->s_version != MINIX_V3) {
136                         sbi->s_mount_state = ms->s_state;
137                         ms->s_state &= ~MINIX_VALID_FS;
138                 } else {
139                         sbi->s_mount_state = MINIX_VALID_FS;
140                 }
141                 mark_buffer_dirty(sbi->s_sbh);
142 
143                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
144                         printk("MINIX-fs warning: remounting unchecked fs, "
145                                 "running fsck is recommended\n");
146                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
147                         printk("MINIX-fs warning: remounting fs with errors, "
148                                 "running fsck is recommended\n");
149         }
150         return 0;
151 }
152 
153 static bool minix_check_superblock(struct super_block *sb)
154 {
155         struct minix_sb_info *sbi = minix_sb(sb);
156 
157         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
158                 return false;
159 
160         /*
161          * s_max_size must not exceed the block mapping limitation.  This check
162          * is only needed for V1 filesystems, since V2/V3 support an extra level
163          * of indirect blocks which places the limit well above U32_MAX.
164          */
165         if (sbi->s_version == MINIX_V1 &&
166             sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE)
167                 return false;
168 
169         return true;
170 }
171 
172 static int minix_fill_super(struct super_block *s, void *data, int silent)
173 {
174         struct buffer_head *bh;
175         struct buffer_head **map;
176         struct minix_super_block *ms;
177         struct minix3_super_block *m3s = NULL;
178         unsigned long i, block;
179         struct inode *root_inode;
180         struct minix_sb_info *sbi;
181         int ret = -EINVAL;
182 
183         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
184         if (!sbi)
185                 return -ENOMEM;
186         s->s_fs_info = sbi;
187 
188         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
189         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
190 
191         if (!sb_set_blocksize(s, BLOCK_SIZE))
192                 goto out_bad_hblock;
193 
194         if (!(bh = sb_bread(s, 1)))
195                 goto out_bad_sb;
196 
197         ms = (struct minix_super_block *) bh->b_data;
198         sbi->s_ms = ms;
199         sbi->s_sbh = bh;
200         sbi->s_mount_state = ms->s_state;
201         sbi->s_ninodes = ms->s_ninodes;
202         sbi->s_nzones = ms->s_nzones;
203         sbi->s_imap_blocks = ms->s_imap_blocks;
204         sbi->s_zmap_blocks = ms->s_zmap_blocks;
205         sbi->s_firstdatazone = ms->s_firstdatazone;
206         sbi->s_log_zone_size = ms->s_log_zone_size;
207         s->s_maxbytes = ms->s_max_size;
208         s->s_magic = ms->s_magic;
209         if (s->s_magic == MINIX_SUPER_MAGIC) {
210                 sbi->s_version = MINIX_V1;
211                 sbi->s_dirsize = 16;
212                 sbi->s_namelen = 14;
213                 s->s_max_links = MINIX_LINK_MAX;
214         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
215                 sbi->s_version = MINIX_V1;
216                 sbi->s_dirsize = 32;
217                 sbi->s_namelen = 30;
218                 s->s_max_links = MINIX_LINK_MAX;
219         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
220                 sbi->s_version = MINIX_V2;
221                 sbi->s_nzones = ms->s_zones;
222                 sbi->s_dirsize = 16;
223                 sbi->s_namelen = 14;
224                 s->s_max_links = MINIX2_LINK_MAX;
225         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
226                 sbi->s_version = MINIX_V2;
227                 sbi->s_nzones = ms->s_zones;
228                 sbi->s_dirsize = 32;
229                 sbi->s_namelen = 30;
230                 s->s_max_links = MINIX2_LINK_MAX;
231         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
232                 m3s = (struct minix3_super_block *) bh->b_data;
233                 s->s_magic = m3s->s_magic;
234                 sbi->s_imap_blocks = m3s->s_imap_blocks;
235                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
236                 sbi->s_firstdatazone = m3s->s_firstdatazone;
237                 sbi->s_log_zone_size = m3s->s_log_zone_size;
238                 s->s_maxbytes = m3s->s_max_size;
239                 sbi->s_ninodes = m3s->s_ninodes;
240                 sbi->s_nzones = m3s->s_zones;
241                 sbi->s_dirsize = 64;
242                 sbi->s_namelen = 60;
243                 sbi->s_version = MINIX_V3;
244                 sbi->s_mount_state = MINIX_VALID_FS;
245                 sb_set_blocksize(s, m3s->s_blocksize);
246                 s->s_max_links = MINIX2_LINK_MAX;
247         } else
248                 goto out_no_fs;
249 
250         if (!minix_check_superblock(s))
251                 goto out_illegal_sb;
252 
253         /*
254          * Allocate the buffer map to keep the superblock small.
255          */
256         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
257         map = kzalloc(i, GFP_KERNEL);
258         if (!map)
259                 goto out_no_map;
260         sbi->s_imap = &map[0];
261         sbi->s_zmap = &map[sbi->s_imap_blocks];
262 
263         block=2;
264         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
265                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
266                         goto out_no_bitmap;
267                 block++;
268         }
269         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
270                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
271                         goto out_no_bitmap;
272                 block++;
273         }
274 
275         minix_set_bit(0,sbi->s_imap[0]->b_data);
276         minix_set_bit(0,sbi->s_zmap[0]->b_data);
277 
278         /* Apparently minix can create filesystems that allocate more blocks for
279          * the bitmaps than needed.  We simply ignore that, but verify it didn't
280          * create one with not enough blocks and bail out if so.
281          */
282         block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
283         if (sbi->s_imap_blocks < block) {
284                 printk("MINIX-fs: file system does not have enough "
285                                 "imap blocks allocated.  Refusing to mount.\n");
286                 goto out_no_bitmap;
287         }
288 
289         block = minix_blocks_needed(
290                         (sbi->s_nzones - sbi->s_firstdatazone + 1),
291                         s->s_blocksize);
292         if (sbi->s_zmap_blocks < block) {
293                 printk("MINIX-fs: file system does not have enough "
294                                 "zmap blocks allocated.  Refusing to mount.\n");
295                 goto out_no_bitmap;
296         }
297 
298         /* set up enough so that it can read an inode */
299         s->s_op = &minix_sops;
300         s->s_time_min = 0;
301         s->s_time_max = U32_MAX;
302         root_inode = minix_iget(s, MINIX_ROOT_INO);
303         if (IS_ERR(root_inode)) {
304                 ret = PTR_ERR(root_inode);
305                 goto out_no_root;
306         }
307 
308         ret = -ENOMEM;
309         s->s_root = d_make_root(root_inode);
310         if (!s->s_root)
311                 goto out_no_root;
312 
313         if (!sb_rdonly(s)) {
314                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
315                         ms->s_state &= ~MINIX_VALID_FS;
316                 mark_buffer_dirty(bh);
317         }
318         if (!(sbi->s_mount_state & MINIX_VALID_FS))
319                 printk("MINIX-fs: mounting unchecked file system, "
320                         "running fsck is recommended\n");
321         else if (sbi->s_mount_state & MINIX_ERROR_FS)
322                 printk("MINIX-fs: mounting file system with errors, "
323                         "running fsck is recommended\n");
324 
325         return 0;
326 
327 out_no_root:
328         if (!silent)
329                 printk("MINIX-fs: get root inode failed\n");
330         goto out_freemap;
331 
332 out_no_bitmap:
333         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
334 out_freemap:
335         for (i = 0; i < sbi->s_imap_blocks; i++)
336                 brelse(sbi->s_imap[i]);
337         for (i = 0; i < sbi->s_zmap_blocks; i++)
338                 brelse(sbi->s_zmap[i]);
339         kfree(sbi->s_imap);
340         goto out_release;
341 
342 out_no_map:
343         ret = -ENOMEM;
344         if (!silent)
345                 printk("MINIX-fs: can't allocate map\n");
346         goto out_release;
347 
348 out_illegal_sb:
349         if (!silent)
350                 printk("MINIX-fs: bad superblock\n");
351         goto out_release;
352 
353 out_no_fs:
354         if (!silent)
355                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
356                        "on device %s.\n", s->s_id);
357 out_release:
358         brelse(bh);
359         goto out;
360 
361 out_bad_hblock:
362         printk("MINIX-fs: blocksize too small for device\n");
363         goto out;
364 
365 out_bad_sb:
366         printk("MINIX-fs: unable to read superblock\n");
367 out:
368         s->s_fs_info = NULL;
369         kfree(sbi);
370         return ret;
371 }
372 
373 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
374 {
375         struct super_block *sb = dentry->d_sb;
376         struct minix_sb_info *sbi = minix_sb(sb);
377         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
378         buf->f_type = sb->s_magic;
379         buf->f_bsize = sb->s_blocksize;
380         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
381         buf->f_bfree = minix_count_free_blocks(sb);
382         buf->f_bavail = buf->f_bfree;
383         buf->f_files = sbi->s_ninodes;
384         buf->f_ffree = minix_count_free_inodes(sb);
385         buf->f_namelen = sbi->s_namelen;
386         buf->f_fsid.val[0] = (u32)id;
387         buf->f_fsid.val[1] = (u32)(id >> 32);
388 
389         return 0;
390 }
391 
392 static int minix_get_block(struct inode *inode, sector_t block,
393                     struct buffer_head *bh_result, int create)
394 {
395         if (INODE_VERSION(inode) == MINIX_V1)
396                 return V1_minix_get_block(inode, block, bh_result, create);
397         else
398                 return V2_minix_get_block(inode, block, bh_result, create);
399 }
400 
401 static int minix_writepage(struct page *page, struct writeback_control *wbc)
402 {
403         return block_write_full_page(page, minix_get_block, wbc);
404 }
405 
406 static int minix_readpage(struct file *file, struct page *page)
407 {
408         return block_read_full_page(page,minix_get_block);
409 }
410 
411 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
412 {
413         return __block_write_begin(page, pos, len, minix_get_block);
414 }
415 
416 static void minix_write_failed(struct address_space *mapping, loff_t to)
417 {
418         struct inode *inode = mapping->host;
419 
420         if (to > inode->i_size) {
421                 truncate_pagecache(inode, inode->i_size);
422                 minix_truncate(inode);
423         }
424 }
425 
426 static int minix_write_begin(struct file *file, struct address_space *mapping,
427                         loff_t pos, unsigned len, unsigned flags,
428                         struct page **pagep, void **fsdata)
429 {
430         int ret;
431 
432         ret = block_write_begin(mapping, pos, len, flags, pagep,
433                                 minix_get_block);
434         if (unlikely(ret))
435                 minix_write_failed(mapping, pos + len);
436 
437         return ret;
438 }
439 
440 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
441 {
442         return generic_block_bmap(mapping,block,minix_get_block);
443 }
444 
445 static const struct address_space_operations minix_aops = {
446         .readpage = minix_readpage,
447         .writepage = minix_writepage,
448         .write_begin = minix_write_begin,
449         .write_end = generic_write_end,
450         .bmap = minix_bmap
451 };
452 
453 static const struct inode_operations minix_symlink_inode_operations = {
454         .get_link       = page_get_link,
455         .getattr        = minix_getattr,
456 };
457 
458 void minix_set_inode(struct inode *inode, dev_t rdev)
459 {
460         if (S_ISREG(inode->i_mode)) {
461                 inode->i_op = &minix_file_inode_operations;
462                 inode->i_fop = &minix_file_operations;
463                 inode->i_mapping->a_ops = &minix_aops;
464         } else if (S_ISDIR(inode->i_mode)) {
465                 inode->i_op = &minix_dir_inode_operations;
466                 inode->i_fop = &minix_dir_operations;
467                 inode->i_mapping->a_ops = &minix_aops;
468         } else if (S_ISLNK(inode->i_mode)) {
469                 inode->i_op = &minix_symlink_inode_operations;
470                 inode_nohighmem(inode);
471                 inode->i_mapping->a_ops = &minix_aops;
472         } else
473                 init_special_inode(inode, inode->i_mode, rdev);
474 }
475 
476 /*
477  * The minix V1 function to read an inode.
478  */
479 static struct inode *V1_minix_iget(struct inode *inode)
480 {
481         struct buffer_head * bh;
482         struct minix_inode * raw_inode;
483         struct minix_inode_info *minix_inode = minix_i(inode);
484         int i;
485 
486         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
487         if (!raw_inode) {
488                 iget_failed(inode);
489                 return ERR_PTR(-EIO);
490         }
491         if (raw_inode->i_nlinks == 0) {
492                 printk("MINIX-fs: deleted inode referenced: %lu\n",
493                        inode->i_ino);
494                 brelse(bh);
495                 iget_failed(inode);
496                 return ERR_PTR(-ESTALE);
497         }
498         inode->i_mode = raw_inode->i_mode;
499         i_uid_write(inode, raw_inode->i_uid);
500         i_gid_write(inode, raw_inode->i_gid);
501         set_nlink(inode, raw_inode->i_nlinks);
502         inode->i_size = raw_inode->i_size;
503         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
504         inode->i_mtime.tv_nsec = 0;
505         inode->i_atime.tv_nsec = 0;
506         inode->i_ctime.tv_nsec = 0;
507         inode->i_blocks = 0;
508         for (i = 0; i < 9; i++)
509                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
510         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
511         brelse(bh);
512         unlock_new_inode(inode);
513         return inode;
514 }
515 
516 /*
517  * The minix V2 function to read an inode.
518  */
519 static struct inode *V2_minix_iget(struct inode *inode)
520 {
521         struct buffer_head * bh;
522         struct minix2_inode * raw_inode;
523         struct minix_inode_info *minix_inode = minix_i(inode);
524         int i;
525 
526         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
527         if (!raw_inode) {
528                 iget_failed(inode);
529                 return ERR_PTR(-EIO);
530         }
531         if (raw_inode->i_nlinks == 0) {
532                 printk("MINIX-fs: deleted inode referenced: %lu\n",
533                        inode->i_ino);
534                 brelse(bh);
535                 iget_failed(inode);
536                 return ERR_PTR(-ESTALE);
537         }
538         inode->i_mode = raw_inode->i_mode;
539         i_uid_write(inode, raw_inode->i_uid);
540         i_gid_write(inode, raw_inode->i_gid);
541         set_nlink(inode, raw_inode->i_nlinks);
542         inode->i_size = raw_inode->i_size;
543         inode->i_mtime.tv_sec = raw_inode->i_mtime;
544         inode->i_atime.tv_sec = raw_inode->i_atime;
545         inode->i_ctime.tv_sec = raw_inode->i_ctime;
546         inode->i_mtime.tv_nsec = 0;
547         inode->i_atime.tv_nsec = 0;
548         inode->i_ctime.tv_nsec = 0;
549         inode->i_blocks = 0;
550         for (i = 0; i < 10; i++)
551                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
552         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
553         brelse(bh);
554         unlock_new_inode(inode);
555         return inode;
556 }
557 
558 /*
559  * The global function to read an inode.
560  */
561 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
562 {
563         struct inode *inode;
564 
565         inode = iget_locked(sb, ino);
566         if (!inode)
567                 return ERR_PTR(-ENOMEM);
568         if (!(inode->i_state & I_NEW))
569                 return inode;
570 
571         if (INODE_VERSION(inode) == MINIX_V1)
572                 return V1_minix_iget(inode);
573         else
574                 return V2_minix_iget(inode);
575 }
576 
577 /*
578  * The minix V1 function to synchronize an inode.
579  */
580 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
581 {
582         struct buffer_head * bh;
583         struct minix_inode * raw_inode;
584         struct minix_inode_info *minix_inode = minix_i(inode);
585         int i;
586 
587         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
588         if (!raw_inode)
589                 return NULL;
590         raw_inode->i_mode = inode->i_mode;
591         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
592         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
593         raw_inode->i_nlinks = inode->i_nlink;
594         raw_inode->i_size = inode->i_size;
595         raw_inode->i_time = inode->i_mtime.tv_sec;
596         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
597                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
598         else for (i = 0; i < 9; i++)
599                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
600         mark_buffer_dirty(bh);
601         return bh;
602 }
603 
604 /*
605  * The minix V2 function to synchronize an inode.
606  */
607 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
608 {
609         struct buffer_head * bh;
610         struct minix2_inode * raw_inode;
611         struct minix_inode_info *minix_inode = minix_i(inode);
612         int i;
613 
614         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
615         if (!raw_inode)
616                 return NULL;
617         raw_inode->i_mode = inode->i_mode;
618         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
619         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
620         raw_inode->i_nlinks = inode->i_nlink;
621         raw_inode->i_size = inode->i_size;
622         raw_inode->i_mtime = inode->i_mtime.tv_sec;
623         raw_inode->i_atime = inode->i_atime.tv_sec;
624         raw_inode->i_ctime = inode->i_ctime.tv_sec;
625         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
626                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
627         else for (i = 0; i < 10; i++)
628                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
629         mark_buffer_dirty(bh);
630         return bh;
631 }
632 
633 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
634 {
635         int err = 0;
636         struct buffer_head *bh;
637 
638         if (INODE_VERSION(inode) == MINIX_V1)
639                 bh = V1_minix_update_inode(inode);
640         else
641                 bh = V2_minix_update_inode(inode);
642         if (!bh)
643                 return -EIO;
644         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
645                 sync_dirty_buffer(bh);
646                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
647                         printk("IO error syncing minix inode [%s:%08lx]\n",
648                                 inode->i_sb->s_id, inode->i_ino);
649                         err = -EIO;
650                 }
651         }
652         brelse (bh);
653         return err;
654 }
655 
656 int minix_getattr(const struct path *path, struct kstat *stat,
657                   u32 request_mask, unsigned int flags)
658 {
659         struct super_block *sb = path->dentry->d_sb;
660         struct inode *inode = d_inode(path->dentry);
661 
662         generic_fillattr(inode, stat);
663         if (INODE_VERSION(inode) == MINIX_V1)
664                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
665         else
666                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
667         stat->blksize = sb->s_blocksize;
668         return 0;
669 }
670 
671 /*
672  * The function that is called for file truncation.
673  */
674 void minix_truncate(struct inode * inode)
675 {
676         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
677                 return;
678         if (INODE_VERSION(inode) == MINIX_V1)
679                 V1_minix_truncate(inode);
680         else
681                 V2_minix_truncate(inode);
682 }
683 
684 static struct dentry *minix_mount(struct file_system_type *fs_type,
685         int flags, const char *dev_name, void *data)
686 {
687         return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
688 }
689 
690 static struct file_system_type minix_fs_type = {
691         .owner          = THIS_MODULE,
692         .name           = "minix",
693         .mount          = minix_mount,
694         .kill_sb        = kill_block_super,
695         .fs_flags       = FS_REQUIRES_DEV,
696 };
697 MODULE_ALIAS_FS("minix");
698 
699 static int __init init_minix_fs(void)
700 {
701         int err = init_inodecache();
702         if (err)
703                 goto out1;
704         err = register_filesystem(&minix_fs_type);
705         if (err)
706                 goto out;
707         return 0;
708 out:
709         destroy_inodecache();
710 out1:
711         return err;
712 }
713 
714 static void __exit exit_minix_fs(void)
715 {
716         unregister_filesystem(&minix_fs_type);
717         destroy_inodecache();
718 }
719 
720 module_init(init_minix_fs)
721 module_exit(exit_minix_fs)
722 MODULE_LICENSE("GPL");
723 
724 

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