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TOMOYO Linux Cross Reference
Linux/fs/minix/inode.c

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

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