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

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  1 /*
  2  * Optimized MPEG FS - inode and super operations.
  3  * Copyright (C) 2006 Bob Copeland <me@bobcopeland.com>
  4  * Released under GPL v2.
  5  */
  6 #include <linux/module.h>
  7 #include <linux/sched.h>
  8 #include <linux/slab.h>
  9 #include <linux/fs.h>
 10 #include <linux/vfs.h>
 11 #include <linux/parser.h>
 12 #include <linux/buffer_head.h>
 13 #include <linux/vmalloc.h>
 14 #include <linux/writeback.h>
 15 #include <linux/crc-itu-t.h>
 16 #include "omfs.h"
 17 
 18 MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
 19 MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
 20 MODULE_LICENSE("GPL");
 21 
 22 struct buffer_head *omfs_bread(struct super_block *sb, sector_t block)
 23 {
 24         struct omfs_sb_info *sbi = OMFS_SB(sb);
 25         if (block >= sbi->s_num_blocks)
 26                 return NULL;
 27 
 28         return sb_bread(sb, clus_to_blk(sbi, block));
 29 }
 30 
 31 struct inode *omfs_new_inode(struct inode *dir, int mode)
 32 {
 33         struct inode *inode;
 34         u64 new_block;
 35         int err;
 36         int len;
 37         struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb);
 38 
 39         inode = new_inode(dir->i_sb);
 40         if (!inode)
 41                 return ERR_PTR(-ENOMEM);
 42 
 43         err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors,
 44                         &new_block, &len);
 45         if (err)
 46                 goto fail;
 47 
 48         inode->i_ino = new_block;
 49         inode_init_owner(inode, NULL, mode);
 50         inode->i_mapping->a_ops = &omfs_aops;
 51 
 52         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 53         switch (mode & S_IFMT) {
 54         case S_IFDIR:
 55                 inode->i_op = &omfs_dir_inops;
 56                 inode->i_fop = &omfs_dir_operations;
 57                 inode->i_size = sbi->s_sys_blocksize;
 58                 inc_nlink(inode);
 59                 break;
 60         case S_IFREG:
 61                 inode->i_op = &omfs_file_inops;
 62                 inode->i_fop = &omfs_file_operations;
 63                 inode->i_size = 0;
 64                 break;
 65         }
 66 
 67         insert_inode_hash(inode);
 68         mark_inode_dirty(inode);
 69         return inode;
 70 fail:
 71         make_bad_inode(inode);
 72         iput(inode);
 73         return ERR_PTR(err);
 74 }
 75 
 76 /*
 77  * Update the header checksums for a dirty inode based on its contents.
 78  * Caller is expected to hold the buffer head underlying oi and mark it
 79  * dirty.
 80  */
 81 static void omfs_update_checksums(struct omfs_inode *oi)
 82 {
 83         int xor, i, ofs = 0, count;
 84         u16 crc = 0;
 85         unsigned char *ptr = (unsigned char *) oi;
 86 
 87         count = be32_to_cpu(oi->i_head.h_body_size);
 88         ofs = sizeof(struct omfs_header);
 89 
 90         crc = crc_itu_t(crc, ptr + ofs, count);
 91         oi->i_head.h_crc = cpu_to_be16(crc);
 92 
 93         xor = ptr[0];
 94         for (i = 1; i < OMFS_XOR_COUNT; i++)
 95                 xor ^= ptr[i];
 96 
 97         oi->i_head.h_check_xor = xor;
 98 }
 99 
100 static int __omfs_write_inode(struct inode *inode, int wait)
101 {
102         struct omfs_inode *oi;
103         struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
104         struct buffer_head *bh, *bh2;
105         u64 ctime;
106         int i;
107         int ret = -EIO;
108         int sync_failed = 0;
109 
110         /* get current inode since we may have written sibling ptrs etc. */
111         bh = omfs_bread(inode->i_sb, inode->i_ino);
112         if (!bh)
113                 goto out;
114 
115         oi = (struct omfs_inode *) bh->b_data;
116 
117         oi->i_head.h_self = cpu_to_be64(inode->i_ino);
118         if (S_ISDIR(inode->i_mode))
119                 oi->i_type = OMFS_DIR;
120         else if (S_ISREG(inode->i_mode))
121                 oi->i_type = OMFS_FILE;
122         else {
123                 printk(KERN_WARNING "omfs: unknown file type: %d\n",
124                         inode->i_mode);
125                 goto out_brelse;
126         }
127 
128         oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize -
129                 sizeof(struct omfs_header));
130         oi->i_head.h_version = 1;
131         oi->i_head.h_type = OMFS_INODE_NORMAL;
132         oi->i_head.h_magic = OMFS_IMAGIC;
133         oi->i_size = cpu_to_be64(inode->i_size);
134 
135         ctime = inode->i_ctime.tv_sec * 1000LL +
136                 ((inode->i_ctime.tv_nsec + 999)/1000);
137         oi->i_ctime = cpu_to_be64(ctime);
138 
139         omfs_update_checksums(oi);
140 
141         mark_buffer_dirty(bh);
142         if (wait) {
143                 sync_dirty_buffer(bh);
144                 if (buffer_req(bh) && !buffer_uptodate(bh))
145                         sync_failed = 1;
146         }
147 
148         /* if mirroring writes, copy to next fsblock */
149         for (i = 1; i < sbi->s_mirrors; i++) {
150                 bh2 = omfs_bread(inode->i_sb, inode->i_ino + i);
151                 if (!bh2)
152                         goto out_brelse;
153 
154                 memcpy(bh2->b_data, bh->b_data, bh->b_size);
155                 mark_buffer_dirty(bh2);
156                 if (wait) {
157                         sync_dirty_buffer(bh2);
158                         if (buffer_req(bh2) && !buffer_uptodate(bh2))
159                                 sync_failed = 1;
160                 }
161                 brelse(bh2);
162         }
163         ret = (sync_failed) ? -EIO : 0;
164 out_brelse:
165         brelse(bh);
166 out:
167         return ret;
168 }
169 
170 static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc)
171 {
172         return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
173 }
174 
175 int omfs_sync_inode(struct inode *inode)
176 {
177         return __omfs_write_inode(inode, 1);
178 }
179 
180 /*
181  * called when an entry is deleted, need to clear the bits in the
182  * bitmaps.
183  */
184 static void omfs_evict_inode(struct inode *inode)
185 {
186         truncate_inode_pages(&inode->i_data, 0);
187         end_writeback(inode);
188 
189         if (inode->i_nlink)
190                 return;
191 
192         if (S_ISREG(inode->i_mode)) {
193                 inode->i_size = 0;
194                 omfs_shrink_inode(inode);
195         }
196 
197         omfs_clear_range(inode->i_sb, inode->i_ino, 2);
198 }
199 
200 struct inode *omfs_iget(struct super_block *sb, ino_t ino)
201 {
202         struct omfs_sb_info *sbi = OMFS_SB(sb);
203         struct omfs_inode *oi;
204         struct buffer_head *bh;
205         u64 ctime;
206         unsigned long nsecs;
207         struct inode *inode;
208 
209         inode = iget_locked(sb, ino);
210         if (!inode)
211                 return ERR_PTR(-ENOMEM);
212         if (!(inode->i_state & I_NEW))
213                 return inode;
214 
215         bh = omfs_bread(inode->i_sb, ino);
216         if (!bh)
217                 goto iget_failed;
218 
219         oi = (struct omfs_inode *)bh->b_data;
220 
221         /* check self */
222         if (ino != be64_to_cpu(oi->i_head.h_self))
223                 goto fail_bh;
224 
225         inode->i_uid = sbi->s_uid;
226         inode->i_gid = sbi->s_gid;
227 
228         ctime = be64_to_cpu(oi->i_ctime);
229         nsecs = do_div(ctime, 1000) * 1000L;
230 
231         inode->i_atime.tv_sec = ctime;
232         inode->i_mtime.tv_sec = ctime;
233         inode->i_ctime.tv_sec = ctime;
234         inode->i_atime.tv_nsec = nsecs;
235         inode->i_mtime.tv_nsec = nsecs;
236         inode->i_ctime.tv_nsec = nsecs;
237 
238         inode->i_mapping->a_ops = &omfs_aops;
239 
240         switch (oi->i_type) {
241         case OMFS_DIR:
242                 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask);
243                 inode->i_op = &omfs_dir_inops;
244                 inode->i_fop = &omfs_dir_operations;
245                 inode->i_size = sbi->s_sys_blocksize;
246                 inc_nlink(inode);
247                 break;
248         case OMFS_FILE:
249                 inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask);
250                 inode->i_fop = &omfs_file_operations;
251                 inode->i_size = be64_to_cpu(oi->i_size);
252                 break;
253         }
254         brelse(bh);
255         unlock_new_inode(inode);
256         return inode;
257 fail_bh:
258         brelse(bh);
259 iget_failed:
260         iget_failed(inode);
261         return ERR_PTR(-EIO);
262 }
263 
264 static void omfs_put_super(struct super_block *sb)
265 {
266         struct omfs_sb_info *sbi = OMFS_SB(sb);
267         kfree(sbi->s_imap);
268         kfree(sbi);
269         sb->s_fs_info = NULL;
270 }
271 
272 static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf)
273 {
274         struct super_block *s = dentry->d_sb;
275         struct omfs_sb_info *sbi = OMFS_SB(s);
276         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
277 
278         buf->f_type = OMFS_MAGIC;
279         buf->f_bsize = sbi->s_blocksize;
280         buf->f_blocks = sbi->s_num_blocks;
281         buf->f_files = sbi->s_num_blocks;
282         buf->f_namelen = OMFS_NAMELEN;
283         buf->f_fsid.val[0] = (u32)id;
284         buf->f_fsid.val[1] = (u32)(id >> 32);
285 
286         buf->f_bfree = buf->f_bavail = buf->f_ffree =
287                 omfs_count_free(s);
288 
289         return 0;
290 }
291 
292 static const struct super_operations omfs_sops = {
293         .write_inode    = omfs_write_inode,
294         .evict_inode    = omfs_evict_inode,
295         .put_super      = omfs_put_super,
296         .statfs         = omfs_statfs,
297         .show_options   = generic_show_options,
298 };
299 
300 /*
301  * For Rio Karma, there is an on-disk free bitmap whose location is
302  * stored in the root block.  For ReplayTV, there is no such free bitmap
303  * so we have to walk the tree.  Both inodes and file data are allocated
304  * from the same map.  This array can be big (300k) so we allocate
305  * in units of the blocksize.
306  */
307 static int omfs_get_imap(struct super_block *sb)
308 {
309         int bitmap_size;
310         int array_size;
311         int count;
312         struct omfs_sb_info *sbi = OMFS_SB(sb);
313         struct buffer_head *bh;
314         unsigned long **ptr;
315         sector_t block;
316 
317         bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8);
318         array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);
319 
320         if (sbi->s_bitmap_ino == ~0ULL)
321                 goto out;
322 
323         sbi->s_imap_size = array_size;
324         sbi->s_imap = kzalloc(array_size * sizeof(unsigned long *), GFP_KERNEL);
325         if (!sbi->s_imap)
326                 goto nomem;
327 
328         block = clus_to_blk(sbi, sbi->s_bitmap_ino);
329         if (block >= sbi->s_num_blocks)
330                 goto nomem;
331 
332         ptr = sbi->s_imap;
333         for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
334                 bh = sb_bread(sb, block++);
335                 if (!bh)
336                         goto nomem_free;
337                 *ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
338                 if (!*ptr) {
339                         brelse(bh);
340                         goto nomem_free;
341                 }
342                 memcpy(*ptr, bh->b_data, sb->s_blocksize);
343                 if (count < sb->s_blocksize)
344                         memset((void *)*ptr + count, 0xff,
345                                 sb->s_blocksize - count);
346                 brelse(bh);
347                 ptr++;
348         }
349 out:
350         return 0;
351 
352 nomem_free:
353         for (count = 0; count < array_size; count++)
354                 kfree(sbi->s_imap[count]);
355 
356         kfree(sbi->s_imap);
357 nomem:
358         sbi->s_imap = NULL;
359         sbi->s_imap_size = 0;
360         return -ENOMEM;
361 }
362 
363 enum {
364         Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err
365 };
366 
367 static const match_table_t tokens = {
368         {Opt_uid, "uid=%u"},
369         {Opt_gid, "gid=%u"},
370         {Opt_umask, "umask=%o"},
371         {Opt_dmask, "dmask=%o"},
372         {Opt_fmask, "fmask=%o"},
373         {Opt_err, NULL},
374 };
375 
376 static int parse_options(char *options, struct omfs_sb_info *sbi)
377 {
378         char *p;
379         substring_t args[MAX_OPT_ARGS];
380         int option;
381 
382         if (!options)
383                 return 1;
384 
385         while ((p = strsep(&options, ",")) != NULL) {
386                 int token;
387                 if (!*p)
388                         continue;
389 
390                 token = match_token(p, tokens, args);
391                 switch (token) {
392                 case Opt_uid:
393                         if (match_int(&args[0], &option))
394                                 return 0;
395                         sbi->s_uid = option;
396                         break;
397                 case Opt_gid:
398                         if (match_int(&args[0], &option))
399                                 return 0;
400                         sbi->s_gid = option;
401                         break;
402                 case Opt_umask:
403                         if (match_octal(&args[0], &option))
404                                 return 0;
405                         sbi->s_fmask = sbi->s_dmask = option;
406                         break;
407                 case Opt_dmask:
408                         if (match_octal(&args[0], &option))
409                                 return 0;
410                         sbi->s_dmask = option;
411                         break;
412                 case Opt_fmask:
413                         if (match_octal(&args[0], &option))
414                                 return 0;
415                         sbi->s_fmask = option;
416                         break;
417                 default:
418                         return 0;
419                 }
420         }
421         return 1;
422 }
423 
424 static int omfs_fill_super(struct super_block *sb, void *data, int silent)
425 {
426         struct buffer_head *bh, *bh2;
427         struct omfs_super_block *omfs_sb;
428         struct omfs_root_block *omfs_rb;
429         struct omfs_sb_info *sbi;
430         struct inode *root;
431         int ret = -EINVAL;
432 
433         save_mount_options(sb, (char *) data);
434 
435         sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL);
436         if (!sbi)
437                 return -ENOMEM;
438 
439         sb->s_fs_info = sbi;
440 
441         sbi->s_uid = current_uid();
442         sbi->s_gid = current_gid();
443         sbi->s_dmask = sbi->s_fmask = current_umask();
444 
445         if (!parse_options((char *) data, sbi))
446                 goto end;
447 
448         sb->s_maxbytes = 0xffffffff;
449 
450         sb_set_blocksize(sb, 0x200);
451 
452         bh = sb_bread(sb, 0);
453         if (!bh)
454                 goto end;
455 
456         omfs_sb = (struct omfs_super_block *)bh->b_data;
457 
458         if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) {
459                 if (!silent)
460                         printk(KERN_ERR "omfs: Invalid superblock (%x)\n",
461                                    omfs_sb->s_magic);
462                 goto out_brelse_bh;
463         }
464         sb->s_magic = OMFS_MAGIC;
465 
466         sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks);
467         sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize);
468         sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors);
469         sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block);
470         sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize);
471         mutex_init(&sbi->s_bitmap_lock);
472 
473         if (sbi->s_sys_blocksize > PAGE_SIZE) {
474                 printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n",
475                         sbi->s_sys_blocksize);
476                 goto out_brelse_bh;
477         }
478 
479         if (sbi->s_blocksize < sbi->s_sys_blocksize ||
480             sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) {
481                 printk(KERN_ERR "omfs: block size (%d) is out of range\n",
482                         sbi->s_blocksize);
483                 goto out_brelse_bh;
484         }
485 
486         /*
487          * Use sys_blocksize as the fs block since it is smaller than a
488          * page while the fs blocksize can be larger.
489          */
490         sb_set_blocksize(sb, sbi->s_sys_blocksize);
491 
492         /*
493          * ...and the difference goes into a shift.  sys_blocksize is always
494          * a power of two factor of blocksize.
495          */
496         sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
497                 get_bitmask_order(sbi->s_sys_blocksize);
498 
499         bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block));
500         if (!bh2)
501                 goto out_brelse_bh;
502 
503         omfs_rb = (struct omfs_root_block *)bh2->b_data;
504 
505         sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap);
506         sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize);
507 
508         if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) {
509                 printk(KERN_ERR "omfs: block count discrepancy between "
510                         "super and root blocks (%llx, %llx)\n",
511                         (unsigned long long)sbi->s_num_blocks,
512                         (unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks));
513                 goto out_brelse_bh2;
514         }
515 
516         if (sbi->s_bitmap_ino != ~0ULL &&
517             sbi->s_bitmap_ino > sbi->s_num_blocks) {
518                 printk(KERN_ERR "omfs: free space bitmap location is corrupt "
519                         "(%llx, total blocks %llx)\n",
520                         (unsigned long long) sbi->s_bitmap_ino,
521                         (unsigned long long) sbi->s_num_blocks);
522                 goto out_brelse_bh2;
523         }
524         if (sbi->s_clustersize < 1 ||
525             sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) {
526                 printk(KERN_ERR "omfs: cluster size out of range (%d)",
527                         sbi->s_clustersize);
528                 goto out_brelse_bh2;
529         }
530 
531         ret = omfs_get_imap(sb);
532         if (ret)
533                 goto out_brelse_bh2;
534 
535         sb->s_op = &omfs_sops;
536 
537         root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir));
538         if (IS_ERR(root)) {
539                 ret = PTR_ERR(root);
540                 goto out_brelse_bh2;
541         }
542 
543         sb->s_root = d_alloc_root(root);
544         if (!sb->s_root) {
545                 iput(root);
546                 goto out_brelse_bh2;
547         }
548         printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name);
549 
550         ret = 0;
551 out_brelse_bh2:
552         brelse(bh2);
553 out_brelse_bh:
554         brelse(bh);
555 end:
556         if (ret)
557                 kfree(sbi);
558         return ret;
559 }
560 
561 static struct dentry *omfs_mount(struct file_system_type *fs_type,
562                         int flags, const char *dev_name, void *data)
563 {
564         return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super);
565 }
566 
567 static struct file_system_type omfs_fs_type = {
568         .owner = THIS_MODULE,
569         .name = "omfs",
570         .mount = omfs_mount,
571         .kill_sb = kill_block_super,
572         .fs_flags = FS_REQUIRES_DEV,
573 };
574 
575 static int __init init_omfs_fs(void)
576 {
577         return register_filesystem(&omfs_fs_type);
578 }
579 
580 static void __exit exit_omfs_fs(void)
581 {
582         unregister_filesystem(&omfs_fs_type);
583 }
584 
585 module_init(init_omfs_fs);
586 module_exit(exit_omfs_fs);
587 

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