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Linux/fs/bfs/inode.c

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  1 /*
  2  *      fs/bfs/inode.c
  3  *      BFS superblock and inode operations.
  4  *      Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
  5  *      From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
  6  *
  7  *      Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/mm.h>
 12 #include <linux/slab.h>
 13 #include <linux/init.h>
 14 #include <linux/fs.h>
 15 #include <linux/buffer_head.h>
 16 #include <linux/vfs.h>
 17 #include <linux/writeback.h>
 18 #include <asm/uaccess.h>
 19 #include "bfs.h"
 20 
 21 MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
 22 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
 23 MODULE_LICENSE("GPL");
 24 
 25 #undef DEBUG
 26 
 27 #ifdef DEBUG
 28 #define dprintf(x...)   printf(x)
 29 #else
 30 #define dprintf(x...)
 31 #endif
 32 
 33 struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
 34 {
 35         struct bfs_inode *di;
 36         struct inode *inode;
 37         struct buffer_head *bh;
 38         int block, off;
 39 
 40         inode = iget_locked(sb, ino);
 41         if (!inode)
 42                 return ERR_PTR(-ENOMEM);
 43         if (!(inode->i_state & I_NEW))
 44                 return inode;
 45 
 46         if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
 47                 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
 48                 goto error;
 49         }
 50 
 51         block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
 52         bh = sb_bread(inode->i_sb, block);
 53         if (!bh) {
 54                 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
 55                                                                         ino);
 56                 goto error;
 57         }
 58 
 59         off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
 60         di = (struct bfs_inode *)bh->b_data + off;
 61 
 62         inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
 63         if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
 64                 inode->i_mode |= S_IFDIR;
 65                 inode->i_op = &bfs_dir_inops;
 66                 inode->i_fop = &bfs_dir_operations;
 67         } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
 68                 inode->i_mode |= S_IFREG;
 69                 inode->i_op = &bfs_file_inops;
 70                 inode->i_fop = &bfs_file_operations;
 71                 inode->i_mapping->a_ops = &bfs_aops;
 72         }
 73 
 74         BFS_I(inode)->i_sblock =  le32_to_cpu(di->i_sblock);
 75         BFS_I(inode)->i_eblock =  le32_to_cpu(di->i_eblock);
 76         BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
 77         i_uid_write(inode, le32_to_cpu(di->i_uid));
 78         i_gid_write(inode,  le32_to_cpu(di->i_gid));
 79         set_nlink(inode, le32_to_cpu(di->i_nlink));
 80         inode->i_size = BFS_FILESIZE(di);
 81         inode->i_blocks = BFS_FILEBLOCKS(di);
 82         inode->i_atime.tv_sec =  le32_to_cpu(di->i_atime);
 83         inode->i_mtime.tv_sec =  le32_to_cpu(di->i_mtime);
 84         inode->i_ctime.tv_sec =  le32_to_cpu(di->i_ctime);
 85         inode->i_atime.tv_nsec = 0;
 86         inode->i_mtime.tv_nsec = 0;
 87         inode->i_ctime.tv_nsec = 0;
 88 
 89         brelse(bh);
 90         unlock_new_inode(inode);
 91         return inode;
 92 
 93 error:
 94         iget_failed(inode);
 95         return ERR_PTR(-EIO);
 96 }
 97 
 98 static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
 99 {
100         if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
101                 printf("Bad inode number %s:%08x\n", sb->s_id, ino);
102                 return ERR_PTR(-EIO);
103         }
104 
105         ino -= BFS_ROOT_INO;
106 
107         *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
108         if (!*p) {
109                 printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
110                 return ERR_PTR(-EIO);
111         }
112 
113         return (struct bfs_inode *)(*p)->b_data +  ino % BFS_INODES_PER_BLOCK;
114 }
115 
116 static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
117 {
118         struct bfs_sb_info *info = BFS_SB(inode->i_sb);
119         unsigned int ino = (u16)inode->i_ino;
120         unsigned long i_sblock;
121         struct bfs_inode *di;
122         struct buffer_head *bh;
123         int err = 0;
124 
125         dprintf("ino=%08x\n", ino);
126 
127         di = find_inode(inode->i_sb, ino, &bh);
128         if (IS_ERR(di))
129                 return PTR_ERR(di);
130 
131         mutex_lock(&info->bfs_lock);
132 
133         if (ino == BFS_ROOT_INO)
134                 di->i_vtype = cpu_to_le32(BFS_VDIR);
135         else
136                 di->i_vtype = cpu_to_le32(BFS_VREG);
137 
138         di->i_ino = cpu_to_le16(ino);
139         di->i_mode = cpu_to_le32(inode->i_mode);
140         di->i_uid = cpu_to_le32(i_uid_read(inode));
141         di->i_gid = cpu_to_le32(i_gid_read(inode));
142         di->i_nlink = cpu_to_le32(inode->i_nlink);
143         di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
144         di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
145         di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
146         i_sblock = BFS_I(inode)->i_sblock;
147         di->i_sblock = cpu_to_le32(i_sblock);
148         di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
149         di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
150 
151         mark_buffer_dirty(bh);
152         if (wbc->sync_mode == WB_SYNC_ALL) {
153                 sync_dirty_buffer(bh);
154                 if (buffer_req(bh) && !buffer_uptodate(bh))
155                         err = -EIO;
156         }
157         brelse(bh);
158         mutex_unlock(&info->bfs_lock);
159         return err;
160 }
161 
162 static void bfs_evict_inode(struct inode *inode)
163 {
164         unsigned long ino = inode->i_ino;
165         struct bfs_inode *di;
166         struct buffer_head *bh;
167         struct super_block *s = inode->i_sb;
168         struct bfs_sb_info *info = BFS_SB(s);
169         struct bfs_inode_info *bi = BFS_I(inode);
170 
171         dprintf("ino=%08lx\n", ino);
172 
173         truncate_inode_pages_final(&inode->i_data);
174         invalidate_inode_buffers(inode);
175         clear_inode(inode);
176 
177         if (inode->i_nlink)
178                 return;
179 
180         di = find_inode(s, inode->i_ino, &bh);
181         if (IS_ERR(di))
182                 return;
183 
184         mutex_lock(&info->bfs_lock);
185         /* clear on-disk inode */
186         memset(di, 0, sizeof(struct bfs_inode));
187         mark_buffer_dirty(bh);
188         brelse(bh);
189 
190         if (bi->i_dsk_ino) {
191                 if (bi->i_sblock)
192                         info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
193                 info->si_freei++;
194                 clear_bit(ino, info->si_imap);
195                 bfs_dump_imap("delete_inode", s);
196         }
197 
198         /*
199          * If this was the last file, make the previous block
200          * "last block of the last file" even if there is no
201          * real file there, saves us 1 gap.
202          */
203         if (info->si_lf_eblk == bi->i_eblock)
204                 info->si_lf_eblk = bi->i_sblock - 1;
205         mutex_unlock(&info->bfs_lock);
206 }
207 
208 static void bfs_put_super(struct super_block *s)
209 {
210         struct bfs_sb_info *info = BFS_SB(s);
211 
212         if (!info)
213                 return;
214 
215         mutex_destroy(&info->bfs_lock);
216         kfree(info->si_imap);
217         kfree(info);
218         s->s_fs_info = NULL;
219 }
220 
221 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
222 {
223         struct super_block *s = dentry->d_sb;
224         struct bfs_sb_info *info = BFS_SB(s);
225         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
226         buf->f_type = BFS_MAGIC;
227         buf->f_bsize = s->s_blocksize;
228         buf->f_blocks = info->si_blocks;
229         buf->f_bfree = buf->f_bavail = info->si_freeb;
230         buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
231         buf->f_ffree = info->si_freei;
232         buf->f_fsid.val[0] = (u32)id;
233         buf->f_fsid.val[1] = (u32)(id >> 32);
234         buf->f_namelen = BFS_NAMELEN;
235         return 0;
236 }
237 
238 static struct kmem_cache *bfs_inode_cachep;
239 
240 static struct inode *bfs_alloc_inode(struct super_block *sb)
241 {
242         struct bfs_inode_info *bi;
243         bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
244         if (!bi)
245                 return NULL;
246         return &bi->vfs_inode;
247 }
248 
249 static void bfs_i_callback(struct rcu_head *head)
250 {
251         struct inode *inode = container_of(head, struct inode, i_rcu);
252         kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
253 }
254 
255 static void bfs_destroy_inode(struct inode *inode)
256 {
257         call_rcu(&inode->i_rcu, bfs_i_callback);
258 }
259 
260 static void init_once(void *foo)
261 {
262         struct bfs_inode_info *bi = foo;
263 
264         inode_init_once(&bi->vfs_inode);
265 }
266 
267 static int __init init_inodecache(void)
268 {
269         bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
270                                              sizeof(struct bfs_inode_info),
271                                              0, (SLAB_RECLAIM_ACCOUNT|
272                                                 SLAB_MEM_SPREAD),
273                                              init_once);
274         if (bfs_inode_cachep == NULL)
275                 return -ENOMEM;
276         return 0;
277 }
278 
279 static void destroy_inodecache(void)
280 {
281         /*
282          * Make sure all delayed rcu free inodes are flushed before we
283          * destroy cache.
284          */
285         rcu_barrier();
286         kmem_cache_destroy(bfs_inode_cachep);
287 }
288 
289 static const struct super_operations bfs_sops = {
290         .alloc_inode    = bfs_alloc_inode,
291         .destroy_inode  = bfs_destroy_inode,
292         .write_inode    = bfs_write_inode,
293         .evict_inode    = bfs_evict_inode,
294         .put_super      = bfs_put_super,
295         .statfs         = bfs_statfs,
296 };
297 
298 void bfs_dump_imap(const char *prefix, struct super_block *s)
299 {
300 #ifdef DEBUG
301         int i;
302         char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
303 
304         if (!tmpbuf)
305                 return;
306         for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
307                 if (i > PAGE_SIZE - 100) break;
308                 if (test_bit(i, BFS_SB(s)->si_imap))
309                         strcat(tmpbuf, "1");
310                 else
311                         strcat(tmpbuf, "");
312         }
313         printf("BFS-fs: %s: lasti=%08lx <%s>\n",
314                                 prefix, BFS_SB(s)->si_lasti, tmpbuf);
315         free_page((unsigned long)tmpbuf);
316 #endif
317 }
318 
319 static int bfs_fill_super(struct super_block *s, void *data, int silent)
320 {
321         struct buffer_head *bh, *sbh;
322         struct bfs_super_block *bfs_sb;
323         struct inode *inode;
324         unsigned i, imap_len;
325         struct bfs_sb_info *info;
326         int ret = -EINVAL;
327         unsigned long i_sblock, i_eblock, i_eoff, s_size;
328 
329         info = kzalloc(sizeof(*info), GFP_KERNEL);
330         if (!info)
331                 return -ENOMEM;
332         mutex_init(&info->bfs_lock);
333         s->s_fs_info = info;
334 
335         sb_set_blocksize(s, BFS_BSIZE);
336 
337         sbh = sb_bread(s, 0);
338         if (!sbh)
339                 goto out;
340         bfs_sb = (struct bfs_super_block *)sbh->b_data;
341         if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
342                 if (!silent)
343                         printf("No BFS filesystem on %s (magic=%08x)\n", 
344                                 s->s_id,  le32_to_cpu(bfs_sb->s_magic));
345                 goto out1;
346         }
347         if (BFS_UNCLEAN(bfs_sb, s) && !silent)
348                 printf("%s is unclean, continuing\n", s->s_id);
349 
350         s->s_magic = BFS_MAGIC;
351 
352         if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
353                 printf("Superblock is corrupted\n");
354                 goto out1;
355         }
356 
357         info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
358                                         sizeof(struct bfs_inode)
359                                         + BFS_ROOT_INO - 1;
360         imap_len = (info->si_lasti / 8) + 1;
361         info->si_imap = kzalloc(imap_len, GFP_KERNEL);
362         if (!info->si_imap)
363                 goto out1;
364         for (i = 0; i < BFS_ROOT_INO; i++)
365                 set_bit(i, info->si_imap);
366 
367         s->s_op = &bfs_sops;
368         inode = bfs_iget(s, BFS_ROOT_INO);
369         if (IS_ERR(inode)) {
370                 ret = PTR_ERR(inode);
371                 goto out2;
372         }
373         s->s_root = d_make_root(inode);
374         if (!s->s_root) {
375                 ret = -ENOMEM;
376                 goto out2;
377         }
378 
379         info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
380         info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
381                         - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
382         info->si_freei = 0;
383         info->si_lf_eblk = 0;
384 
385         /* can we read the last block? */
386         bh = sb_bread(s, info->si_blocks - 1);
387         if (!bh) {
388                 printf("Last block not available: %lu\n", info->si_blocks - 1);
389                 ret = -EIO;
390                 goto out3;
391         }
392         brelse(bh);
393 
394         bh = NULL;
395         for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
396                 struct bfs_inode *di;
397                 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
398                 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
399                 unsigned long eblock;
400 
401                 if (!off) {
402                         brelse(bh);
403                         bh = sb_bread(s, block);
404                 }
405 
406                 if (!bh)
407                         continue;
408 
409                 di = (struct bfs_inode *)bh->b_data + off;
410 
411                 /* test if filesystem is not corrupted */
412 
413                 i_eoff = le32_to_cpu(di->i_eoffset);
414                 i_sblock = le32_to_cpu(di->i_sblock);
415                 i_eblock = le32_to_cpu(di->i_eblock);
416                 s_size = le32_to_cpu(bfs_sb->s_end);
417 
418                 if (i_sblock > info->si_blocks ||
419                         i_eblock > info->si_blocks ||
420                         i_sblock > i_eblock ||
421                         i_eoff > s_size ||
422                         i_sblock * BFS_BSIZE > i_eoff) {
423 
424                         printf("Inode 0x%08x corrupted\n", i);
425 
426                         brelse(bh);
427                         ret = -EIO;
428                         goto out3;
429                 }
430 
431                 if (!di->i_ino) {
432                         info->si_freei++;
433                         continue;
434                 }
435                 set_bit(i, info->si_imap);
436                 info->si_freeb -= BFS_FILEBLOCKS(di);
437 
438                 eblock =  le32_to_cpu(di->i_eblock);
439                 if (eblock > info->si_lf_eblk)
440                         info->si_lf_eblk = eblock;
441         }
442         brelse(bh);
443         brelse(sbh);
444         bfs_dump_imap("read_super", s);
445         return 0;
446 
447 out3:
448         dput(s->s_root);
449         s->s_root = NULL;
450 out2:
451         kfree(info->si_imap);
452 out1:
453         brelse(sbh);
454 out:
455         mutex_destroy(&info->bfs_lock);
456         kfree(info);
457         s->s_fs_info = NULL;
458         return ret;
459 }
460 
461 static struct dentry *bfs_mount(struct file_system_type *fs_type,
462         int flags, const char *dev_name, void *data)
463 {
464         return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
465 }
466 
467 static struct file_system_type bfs_fs_type = {
468         .owner          = THIS_MODULE,
469         .name           = "bfs",
470         .mount          = bfs_mount,
471         .kill_sb        = kill_block_super,
472         .fs_flags       = FS_REQUIRES_DEV,
473 };
474 MODULE_ALIAS_FS("bfs");
475 
476 static int __init init_bfs_fs(void)
477 {
478         int err = init_inodecache();
479         if (err)
480                 goto out1;
481         err = register_filesystem(&bfs_fs_type);
482         if (err)
483                 goto out;
484         return 0;
485 out:
486         destroy_inodecache();
487 out1:
488         return err;
489 }
490 
491 static void __exit exit_bfs_fs(void)
492 {
493         unregister_filesystem(&bfs_fs_type);
494         destroy_inodecache();
495 }
496 
497 module_init(init_bfs_fs)
498 module_exit(exit_bfs_fs)
499 

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