~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_final(&inode->i_data);
 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_rdonly(sb)) {
 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 = 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 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|SLAB_ACCOUNT),
 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         sync_filesystem(sb);
127         ms = sbi->s_ms;
128         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
129                 return 0;
130         if (*flags & SB_RDONLY) {
131                 if (ms->s_state & MINIX_VALID_FS ||
132                     !(sbi->s_mount_state & MINIX_VALID_FS))
133                         return 0;
134                 /* Mounting a rw partition read-only. */
135                 if (sbi->s_version != MINIX_V3)
136                         ms->s_state = sbi->s_mount_state;
137                 mark_buffer_dirty(sbi->s_sbh);
138         } else {
139                 /* Mount a partition which is read-only, read-write. */
140                 if (sbi->s_version != MINIX_V3) {
141                         sbi->s_mount_state = ms->s_state;
142                         ms->s_state &= ~MINIX_VALID_FS;
143                 } else {
144                         sbi->s_mount_state = MINIX_VALID_FS;
145                 }
146                 mark_buffer_dirty(sbi->s_sbh);
147 
148                 if (!(sbi->s_mount_state & MINIX_VALID_FS))
149                         printk("MINIX-fs warning: remounting unchecked fs, "
150                                 "running fsck is recommended\n");
151                 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
152                         printk("MINIX-fs warning: remounting fs with errors, "
153                                 "running fsck is recommended\n");
154         }
155         return 0;
156 }
157 
158 static int minix_fill_super(struct super_block *s, void *data, int silent)
159 {
160         struct buffer_head *bh;
161         struct buffer_head **map;
162         struct minix_super_block *ms;
163         struct minix3_super_block *m3s = NULL;
164         unsigned long i, block;
165         struct inode *root_inode;
166         struct minix_sb_info *sbi;
167         int ret = -EINVAL;
168 
169         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
170         if (!sbi)
171                 return -ENOMEM;
172         s->s_fs_info = sbi;
173 
174         BUILD_BUG_ON(32 != sizeof (struct minix_inode));
175         BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
176 
177         if (!sb_set_blocksize(s, BLOCK_SIZE))
178                 goto out_bad_hblock;
179 
180         if (!(bh = sb_bread(s, 1)))
181                 goto out_bad_sb;
182 
183         ms = (struct minix_super_block *) bh->b_data;
184         sbi->s_ms = ms;
185         sbi->s_sbh = bh;
186         sbi->s_mount_state = ms->s_state;
187         sbi->s_ninodes = ms->s_ninodes;
188         sbi->s_nzones = ms->s_nzones;
189         sbi->s_imap_blocks = ms->s_imap_blocks;
190         sbi->s_zmap_blocks = ms->s_zmap_blocks;
191         sbi->s_firstdatazone = ms->s_firstdatazone;
192         sbi->s_log_zone_size = ms->s_log_zone_size;
193         sbi->s_max_size = ms->s_max_size;
194         s->s_magic = ms->s_magic;
195         if (s->s_magic == MINIX_SUPER_MAGIC) {
196                 sbi->s_version = MINIX_V1;
197                 sbi->s_dirsize = 16;
198                 sbi->s_namelen = 14;
199                 s->s_max_links = MINIX_LINK_MAX;
200         } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
201                 sbi->s_version = MINIX_V1;
202                 sbi->s_dirsize = 32;
203                 sbi->s_namelen = 30;
204                 s->s_max_links = MINIX_LINK_MAX;
205         } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
206                 sbi->s_version = MINIX_V2;
207                 sbi->s_nzones = ms->s_zones;
208                 sbi->s_dirsize = 16;
209                 sbi->s_namelen = 14;
210                 s->s_max_links = MINIX2_LINK_MAX;
211         } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
212                 sbi->s_version = MINIX_V2;
213                 sbi->s_nzones = ms->s_zones;
214                 sbi->s_dirsize = 32;
215                 sbi->s_namelen = 30;
216                 s->s_max_links = MINIX2_LINK_MAX;
217         } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
218                 m3s = (struct minix3_super_block *) bh->b_data;
219                 s->s_magic = m3s->s_magic;
220                 sbi->s_imap_blocks = m3s->s_imap_blocks;
221                 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
222                 sbi->s_firstdatazone = m3s->s_firstdatazone;
223                 sbi->s_log_zone_size = m3s->s_log_zone_size;
224                 sbi->s_max_size = m3s->s_max_size;
225                 sbi->s_ninodes = m3s->s_ninodes;
226                 sbi->s_nzones = m3s->s_zones;
227                 sbi->s_dirsize = 64;
228                 sbi->s_namelen = 60;
229                 sbi->s_version = MINIX_V3;
230                 sbi->s_mount_state = MINIX_VALID_FS;
231                 sb_set_blocksize(s, m3s->s_blocksize);
232                 s->s_max_links = MINIX2_LINK_MAX;
233         } else
234                 goto out_no_fs;
235 
236         /*
237          * Allocate the buffer map to keep the superblock small.
238          */
239         if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
240                 goto out_illegal_sb;
241         i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
242         map = kzalloc(i, GFP_KERNEL);
243         if (!map)
244                 goto out_no_map;
245         sbi->s_imap = &map[0];
246         sbi->s_zmap = &map[sbi->s_imap_blocks];
247 
248         block=2;
249         for (i=0 ; i < sbi->s_imap_blocks ; i++) {
250                 if (!(sbi->s_imap[i]=sb_bread(s, block)))
251                         goto out_no_bitmap;
252                 block++;
253         }
254         for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
255                 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
256                         goto out_no_bitmap;
257                 block++;
258         }
259 
260         minix_set_bit(0,sbi->s_imap[0]->b_data);
261         minix_set_bit(0,sbi->s_zmap[0]->b_data);
262 
263         /* Apparently minix can create filesystems that allocate more blocks for
264          * the bitmaps than needed.  We simply ignore that, but verify it didn't
265          * create one with not enough blocks and bail out if so.
266          */
267         block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
268         if (sbi->s_imap_blocks < block) {
269                 printk("MINIX-fs: file system does not have enough "
270                                 "imap blocks allocated.  Refusing to mount.\n");
271                 goto out_no_bitmap;
272         }
273 
274         block = minix_blocks_needed(
275                         (sbi->s_nzones - sbi->s_firstdatazone + 1),
276                         s->s_blocksize);
277         if (sbi->s_zmap_blocks < block) {
278                 printk("MINIX-fs: file system does not have enough "
279                                 "zmap blocks allocated.  Refusing to mount.\n");
280                 goto out_no_bitmap;
281         }
282 
283         /* set up enough so that it can read an inode */
284         s->s_op = &minix_sops;
285         root_inode = minix_iget(s, MINIX_ROOT_INO);
286         if (IS_ERR(root_inode)) {
287                 ret = PTR_ERR(root_inode);
288                 goto out_no_root;
289         }
290 
291         ret = -ENOMEM;
292         s->s_root = d_make_root(root_inode);
293         if (!s->s_root)
294                 goto out_no_root;
295 
296         if (!sb_rdonly(s)) {
297                 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
298                         ms->s_state &= ~MINIX_VALID_FS;
299                 mark_buffer_dirty(bh);
300         }
301         if (!(sbi->s_mount_state & MINIX_VALID_FS))
302                 printk("MINIX-fs: mounting unchecked file system, "
303                         "running fsck is recommended\n");
304         else if (sbi->s_mount_state & MINIX_ERROR_FS)
305                 printk("MINIX-fs: mounting file system with errors, "
306                         "running fsck is recommended\n");
307 
308         return 0;
309 
310 out_no_root:
311         if (!silent)
312                 printk("MINIX-fs: get root inode failed\n");
313         goto out_freemap;
314 
315 out_no_bitmap:
316         printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
317 out_freemap:
318         for (i = 0; i < sbi->s_imap_blocks; i++)
319                 brelse(sbi->s_imap[i]);
320         for (i = 0; i < sbi->s_zmap_blocks; i++)
321                 brelse(sbi->s_zmap[i]);
322         kfree(sbi->s_imap);
323         goto out_release;
324 
325 out_no_map:
326         ret = -ENOMEM;
327         if (!silent)
328                 printk("MINIX-fs: can't allocate map\n");
329         goto out_release;
330 
331 out_illegal_sb:
332         if (!silent)
333                 printk("MINIX-fs: bad superblock\n");
334         goto out_release;
335 
336 out_no_fs:
337         if (!silent)
338                 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
339                        "on device %s.\n", s->s_id);
340 out_release:
341         brelse(bh);
342         goto out;
343 
344 out_bad_hblock:
345         printk("MINIX-fs: blocksize too small for device\n");
346         goto out;
347 
348 out_bad_sb:
349         printk("MINIX-fs: unable to read superblock\n");
350 out:
351         s->s_fs_info = NULL;
352         kfree(sbi);
353         return ret;
354 }
355 
356 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
357 {
358         struct super_block *sb = dentry->d_sb;
359         struct minix_sb_info *sbi = minix_sb(sb);
360         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
361         buf->f_type = sb->s_magic;
362         buf->f_bsize = sb->s_blocksize;
363         buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
364         buf->f_bfree = minix_count_free_blocks(sb);
365         buf->f_bavail = buf->f_bfree;
366         buf->f_files = sbi->s_ninodes;
367         buf->f_ffree = minix_count_free_inodes(sb);
368         buf->f_namelen = sbi->s_namelen;
369         buf->f_fsid.val[0] = (u32)id;
370         buf->f_fsid.val[1] = (u32)(id >> 32);
371 
372         return 0;
373 }
374 
375 static int minix_get_block(struct inode *inode, sector_t block,
376                     struct buffer_head *bh_result, int create)
377 {
378         if (INODE_VERSION(inode) == MINIX_V1)
379                 return V1_minix_get_block(inode, block, bh_result, create);
380         else
381                 return V2_minix_get_block(inode, block, bh_result, create);
382 }
383 
384 static int minix_writepage(struct page *page, struct writeback_control *wbc)
385 {
386         return block_write_full_page(page, minix_get_block, wbc);
387 }
388 
389 static int minix_readpage(struct file *file, struct page *page)
390 {
391         return block_read_full_page(page,minix_get_block);
392 }
393 
394 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
395 {
396         return __block_write_begin(page, pos, len, minix_get_block);
397 }
398 
399 static void minix_write_failed(struct address_space *mapping, loff_t to)
400 {
401         struct inode *inode = mapping->host;
402 
403         if (to > inode->i_size) {
404                 truncate_pagecache(inode, inode->i_size);
405                 minix_truncate(inode);
406         }
407 }
408 
409 static int minix_write_begin(struct file *file, struct address_space *mapping,
410                         loff_t pos, unsigned len, unsigned flags,
411                         struct page **pagep, void **fsdata)
412 {
413         int ret;
414 
415         ret = block_write_begin(mapping, pos, len, flags, pagep,
416                                 minix_get_block);
417         if (unlikely(ret))
418                 minix_write_failed(mapping, pos + len);
419 
420         return ret;
421 }
422 
423 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
424 {
425         return generic_block_bmap(mapping,block,minix_get_block);
426 }
427 
428 static const struct address_space_operations minix_aops = {
429         .readpage = minix_readpage,
430         .writepage = minix_writepage,
431         .write_begin = minix_write_begin,
432         .write_end = generic_write_end,
433         .bmap = minix_bmap
434 };
435 
436 static const struct inode_operations minix_symlink_inode_operations = {
437         .get_link       = page_get_link,
438         .getattr        = minix_getattr,
439 };
440 
441 void minix_set_inode(struct inode *inode, dev_t rdev)
442 {
443         if (S_ISREG(inode->i_mode)) {
444                 inode->i_op = &minix_file_inode_operations;
445                 inode->i_fop = &minix_file_operations;
446                 inode->i_mapping->a_ops = &minix_aops;
447         } else if (S_ISDIR(inode->i_mode)) {
448                 inode->i_op = &minix_dir_inode_operations;
449                 inode->i_fop = &minix_dir_operations;
450                 inode->i_mapping->a_ops = &minix_aops;
451         } else if (S_ISLNK(inode->i_mode)) {
452                 inode->i_op = &minix_symlink_inode_operations;
453                 inode_nohighmem(inode);
454                 inode->i_mapping->a_ops = &minix_aops;
455         } else
456                 init_special_inode(inode, inode->i_mode, rdev);
457 }
458 
459 /*
460  * The minix V1 function to read an inode.
461  */
462 static struct inode *V1_minix_iget(struct inode *inode)
463 {
464         struct buffer_head * bh;
465         struct minix_inode * raw_inode;
466         struct minix_inode_info *minix_inode = minix_i(inode);
467         int i;
468 
469         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
470         if (!raw_inode) {
471                 iget_failed(inode);
472                 return ERR_PTR(-EIO);
473         }
474         inode->i_mode = raw_inode->i_mode;
475         i_uid_write(inode, raw_inode->i_uid);
476         i_gid_write(inode, raw_inode->i_gid);
477         set_nlink(inode, raw_inode->i_nlinks);
478         inode->i_size = raw_inode->i_size;
479         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
480         inode->i_mtime.tv_nsec = 0;
481         inode->i_atime.tv_nsec = 0;
482         inode->i_ctime.tv_nsec = 0;
483         inode->i_blocks = 0;
484         for (i = 0; i < 9; i++)
485                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
486         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
487         brelse(bh);
488         unlock_new_inode(inode);
489         return inode;
490 }
491 
492 /*
493  * The minix V2 function to read an inode.
494  */
495 static struct inode *V2_minix_iget(struct inode *inode)
496 {
497         struct buffer_head * bh;
498         struct minix2_inode * raw_inode;
499         struct minix_inode_info *minix_inode = minix_i(inode);
500         int i;
501 
502         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
503         if (!raw_inode) {
504                 iget_failed(inode);
505                 return ERR_PTR(-EIO);
506         }
507         inode->i_mode = raw_inode->i_mode;
508         i_uid_write(inode, raw_inode->i_uid);
509         i_gid_write(inode, raw_inode->i_gid);
510         set_nlink(inode, raw_inode->i_nlinks);
511         inode->i_size = raw_inode->i_size;
512         inode->i_mtime.tv_sec = raw_inode->i_mtime;
513         inode->i_atime.tv_sec = raw_inode->i_atime;
514         inode->i_ctime.tv_sec = raw_inode->i_ctime;
515         inode->i_mtime.tv_nsec = 0;
516         inode->i_atime.tv_nsec = 0;
517         inode->i_ctime.tv_nsec = 0;
518         inode->i_blocks = 0;
519         for (i = 0; i < 10; i++)
520                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
521         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
522         brelse(bh);
523         unlock_new_inode(inode);
524         return inode;
525 }
526 
527 /*
528  * The global function to read an inode.
529  */
530 struct inode *minix_iget(struct super_block *sb, unsigned long ino)
531 {
532         struct inode *inode;
533 
534         inode = iget_locked(sb, ino);
535         if (!inode)
536                 return ERR_PTR(-ENOMEM);
537         if (!(inode->i_state & I_NEW))
538                 return inode;
539 
540         if (INODE_VERSION(inode) == MINIX_V1)
541                 return V1_minix_iget(inode);
542         else
543                 return V2_minix_iget(inode);
544 }
545 
546 /*
547  * The minix V1 function to synchronize an inode.
548  */
549 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
550 {
551         struct buffer_head * bh;
552         struct minix_inode * raw_inode;
553         struct minix_inode_info *minix_inode = minix_i(inode);
554         int i;
555 
556         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
557         if (!raw_inode)
558                 return NULL;
559         raw_inode->i_mode = inode->i_mode;
560         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
561         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
562         raw_inode->i_nlinks = inode->i_nlink;
563         raw_inode->i_size = inode->i_size;
564         raw_inode->i_time = inode->i_mtime.tv_sec;
565         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
566                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
567         else for (i = 0; i < 9; i++)
568                 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
569         mark_buffer_dirty(bh);
570         return bh;
571 }
572 
573 /*
574  * The minix V2 function to synchronize an inode.
575  */
576 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
577 {
578         struct buffer_head * bh;
579         struct minix2_inode * raw_inode;
580         struct minix_inode_info *minix_inode = minix_i(inode);
581         int i;
582 
583         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
584         if (!raw_inode)
585                 return NULL;
586         raw_inode->i_mode = inode->i_mode;
587         raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
588         raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
589         raw_inode->i_nlinks = inode->i_nlink;
590         raw_inode->i_size = inode->i_size;
591         raw_inode->i_mtime = inode->i_mtime.tv_sec;
592         raw_inode->i_atime = inode->i_atime.tv_sec;
593         raw_inode->i_ctime = inode->i_ctime.tv_sec;
594         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
595                 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
596         else for (i = 0; i < 10; i++)
597                 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
598         mark_buffer_dirty(bh);
599         return bh;
600 }
601 
602 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
603 {
604         int err = 0;
605         struct buffer_head *bh;
606 
607         if (INODE_VERSION(inode) == MINIX_V1)
608                 bh = V1_minix_update_inode(inode);
609         else
610                 bh = V2_minix_update_inode(inode);
611         if (!bh)
612                 return -EIO;
613         if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
614                 sync_dirty_buffer(bh);
615                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
616                         printk("IO error syncing minix inode [%s:%08lx]\n",
617                                 inode->i_sb->s_id, inode->i_ino);
618                         err = -EIO;
619                 }
620         }
621         brelse (bh);
622         return err;
623 }
624 
625 int minix_getattr(const struct path *path, struct kstat *stat,
626                   u32 request_mask, unsigned int flags)
627 {
628         struct super_block *sb = path->dentry->d_sb;
629         struct inode *inode = d_inode(path->dentry);
630 
631         generic_fillattr(inode, stat);
632         if (INODE_VERSION(inode) == MINIX_V1)
633                 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
634         else
635                 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
636         stat->blksize = sb->s_blocksize;
637         return 0;
638 }
639 
640 /*
641  * The function that is called for file truncation.
642  */
643 void minix_truncate(struct inode * inode)
644 {
645         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
646                 return;
647         if (INODE_VERSION(inode) == MINIX_V1)
648                 V1_minix_truncate(inode);
649         else
650                 V2_minix_truncate(inode);
651 }
652 
653 static struct dentry *minix_mount(struct file_system_type *fs_type,
654         int flags, const char *dev_name, void *data)
655 {
656         return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
657 }
658 
659 static struct file_system_type minix_fs_type = {
660         .owner          = THIS_MODULE,
661         .name           = "minix",
662         .mount          = minix_mount,
663         .kill_sb        = kill_block_super,
664         .fs_flags       = FS_REQUIRES_DEV,
665 };
666 MODULE_ALIAS_FS("minix");
667 
668 static int __init init_minix_fs(void)
669 {
670         int err = init_inodecache();
671         if (err)
672                 goto out1;
673         err = register_filesystem(&minix_fs_type);
674         if (err)
675                 goto out;
676         return 0;
677 out:
678         destroy_inodecache();
679 out1:
680         return err;
681 }
682 
683 static void __exit exit_minix_fs(void)
684 {
685         unregister_filesystem(&minix_fs_type);
686         destroy_inodecache();
687 }
688 
689 module_init(init_minix_fs)
690 module_exit(exit_minix_fs)
691 MODULE_LICENSE("GPL");
692 
693 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp