inode.c 11 KB

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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. #include <linux/module.h>
  10. #include <linux/mm.h>
  11. #include <linux/slab.h>
  12. #include <linux/init.h>
  13. #include <linux/fs.h>
  14. #include <linux/smp_lock.h>
  15. #include <linux/buffer_head.h>
  16. #include <linux/vfs.h>
  17. #include <asm/uaccess.h>
  18. #include "bfs.h"
  19. MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
  20. MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
  21. MODULE_LICENSE("GPL");
  22. #undef DEBUG
  23. #ifdef DEBUG
  24. #define dprintf(x...) printf(x)
  25. #else
  26. #define dprintf(x...)
  27. #endif
  28. void dump_imap(const char *prefix, struct super_block * s);
  29. static void bfs_read_inode(struct inode * inode)
  30. {
  31. unsigned long ino = inode->i_ino;
  32. struct bfs_inode * di;
  33. struct buffer_head * bh;
  34. int block, off;
  35. if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
  36. printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
  37. make_bad_inode(inode);
  38. return;
  39. }
  40. block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
  41. bh = sb_bread(inode->i_sb, block);
  42. if (!bh) {
  43. printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
  44. make_bad_inode(inode);
  45. return;
  46. }
  47. off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
  48. di = (struct bfs_inode *)bh->b_data + off;
  49. inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
  50. if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
  51. inode->i_mode |= S_IFDIR;
  52. inode->i_op = &bfs_dir_inops;
  53. inode->i_fop = &bfs_dir_operations;
  54. } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
  55. inode->i_mode |= S_IFREG;
  56. inode->i_op = &bfs_file_inops;
  57. inode->i_fop = &bfs_file_operations;
  58. inode->i_mapping->a_ops = &bfs_aops;
  59. }
  60. BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
  61. BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
  62. inode->i_uid = le32_to_cpu(di->i_uid);
  63. inode->i_gid = le32_to_cpu(di->i_gid);
  64. inode->i_nlink = le32_to_cpu(di->i_nlink);
  65. inode->i_size = BFS_FILESIZE(di);
  66. inode->i_blocks = BFS_FILEBLOCKS(di);
  67. if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks);
  68. inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
  69. inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
  70. inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
  71. inode->i_atime.tv_nsec = 0;
  72. inode->i_mtime.tv_nsec = 0;
  73. inode->i_ctime.tv_nsec = 0;
  74. BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */
  75. brelse(bh);
  76. }
  77. static int bfs_write_inode(struct inode * inode, int unused)
  78. {
  79. unsigned int ino = (u16)inode->i_ino;
  80. unsigned long i_sblock;
  81. struct bfs_inode * di;
  82. struct buffer_head * bh;
  83. int block, off;
  84. dprintf("ino=%08x\n", ino);
  85. if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
  86. printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
  87. return -EIO;
  88. }
  89. lock_kernel();
  90. block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
  91. bh = sb_bread(inode->i_sb, block);
  92. if (!bh) {
  93. printf("Unable to read inode %s:%08x\n", inode->i_sb->s_id, ino);
  94. unlock_kernel();
  95. return -EIO;
  96. }
  97. off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
  98. di = (struct bfs_inode *)bh->b_data + off;
  99. if (ino == BFS_ROOT_INO)
  100. di->i_vtype = cpu_to_le32(BFS_VDIR);
  101. else
  102. di->i_vtype = cpu_to_le32(BFS_VREG);
  103. di->i_ino = cpu_to_le16(ino);
  104. di->i_mode = cpu_to_le32(inode->i_mode);
  105. di->i_uid = cpu_to_le32(inode->i_uid);
  106. di->i_gid = cpu_to_le32(inode->i_gid);
  107. di->i_nlink = cpu_to_le32(inode->i_nlink);
  108. di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
  109. di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
  110. di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
  111. i_sblock = BFS_I(inode)->i_sblock;
  112. di->i_sblock = cpu_to_le32(i_sblock);
  113. di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
  114. di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
  115. mark_buffer_dirty(bh);
  116. dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off);
  117. brelse(bh);
  118. unlock_kernel();
  119. return 0;
  120. }
  121. static void bfs_delete_inode(struct inode * inode)
  122. {
  123. unsigned long ino = inode->i_ino;
  124. struct bfs_inode * di;
  125. struct buffer_head * bh;
  126. int block, off;
  127. struct super_block * s = inode->i_sb;
  128. struct bfs_sb_info * info = BFS_SB(s);
  129. struct bfs_inode_info * bi = BFS_I(inode);
  130. dprintf("ino=%08lx\n", ino);
  131. truncate_inode_pages(&inode->i_data, 0);
  132. if (ino < BFS_ROOT_INO || ino > info->si_lasti) {
  133. printf("invalid ino=%08lx\n", ino);
  134. return;
  135. }
  136. inode->i_size = 0;
  137. inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
  138. lock_kernel();
  139. mark_inode_dirty(inode);
  140. block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
  141. bh = sb_bread(s, block);
  142. if (!bh) {
  143. printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
  144. unlock_kernel();
  145. return;
  146. }
  147. off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
  148. di = (struct bfs_inode *) bh->b_data + off;
  149. if (bi->i_dsk_ino) {
  150. info->si_freeb += 1 + bi->i_eblock - bi->i_sblock;
  151. info->si_freei++;
  152. clear_bit(ino, info->si_imap);
  153. dump_imap("delete_inode", s);
  154. }
  155. di->i_ino = 0;
  156. di->i_sblock = 0;
  157. mark_buffer_dirty(bh);
  158. brelse(bh);
  159. /* if this was the last file, make the previous
  160. block "last files last block" even if there is no real file there,
  161. saves us 1 gap */
  162. if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
  163. info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
  164. mark_buffer_dirty(info->si_sbh);
  165. }
  166. unlock_kernel();
  167. clear_inode(inode);
  168. }
  169. static void bfs_put_super(struct super_block *s)
  170. {
  171. struct bfs_sb_info *info = BFS_SB(s);
  172. brelse(info->si_sbh);
  173. kfree(info->si_imap);
  174. kfree(info);
  175. s->s_fs_info = NULL;
  176. }
  177. static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
  178. {
  179. struct super_block *s = dentry->d_sb;
  180. struct bfs_sb_info *info = BFS_SB(s);
  181. u64 id = huge_encode_dev(s->s_bdev->bd_dev);
  182. buf->f_type = BFS_MAGIC;
  183. buf->f_bsize = s->s_blocksize;
  184. buf->f_blocks = info->si_blocks;
  185. buf->f_bfree = buf->f_bavail = info->si_freeb;
  186. buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
  187. buf->f_ffree = info->si_freei;
  188. buf->f_fsid.val[0] = (u32)id;
  189. buf->f_fsid.val[1] = (u32)(id >> 32);
  190. buf->f_namelen = BFS_NAMELEN;
  191. return 0;
  192. }
  193. static void bfs_write_super(struct super_block *s)
  194. {
  195. lock_kernel();
  196. if (!(s->s_flags & MS_RDONLY))
  197. mark_buffer_dirty(BFS_SB(s)->si_sbh);
  198. s->s_dirt = 0;
  199. unlock_kernel();
  200. }
  201. static struct kmem_cache * bfs_inode_cachep;
  202. static struct inode *bfs_alloc_inode(struct super_block *sb)
  203. {
  204. struct bfs_inode_info *bi;
  205. bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
  206. if (!bi)
  207. return NULL;
  208. return &bi->vfs_inode;
  209. }
  210. static void bfs_destroy_inode(struct inode *inode)
  211. {
  212. kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
  213. }
  214. static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
  215. {
  216. struct bfs_inode_info *bi = foo;
  217. if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  218. SLAB_CTOR_CONSTRUCTOR)
  219. inode_init_once(&bi->vfs_inode);
  220. }
  221. static int init_inodecache(void)
  222. {
  223. bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
  224. sizeof(struct bfs_inode_info),
  225. 0, (SLAB_RECLAIM_ACCOUNT|
  226. SLAB_MEM_SPREAD),
  227. init_once, NULL);
  228. if (bfs_inode_cachep == NULL)
  229. return -ENOMEM;
  230. return 0;
  231. }
  232. static void destroy_inodecache(void)
  233. {
  234. kmem_cache_destroy(bfs_inode_cachep);
  235. }
  236. static const struct super_operations bfs_sops = {
  237. .alloc_inode = bfs_alloc_inode,
  238. .destroy_inode = bfs_destroy_inode,
  239. .read_inode = bfs_read_inode,
  240. .write_inode = bfs_write_inode,
  241. .delete_inode = bfs_delete_inode,
  242. .put_super = bfs_put_super,
  243. .write_super = bfs_write_super,
  244. .statfs = bfs_statfs,
  245. };
  246. void dump_imap(const char *prefix, struct super_block * s)
  247. {
  248. #ifdef DEBUG
  249. int i;
  250. char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
  251. if (!tmpbuf)
  252. return;
  253. for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
  254. if (i > PAGE_SIZE-100) break;
  255. if (test_bit(i, BFS_SB(s)->si_imap))
  256. strcat(tmpbuf, "1");
  257. else
  258. strcat(tmpbuf, "0");
  259. }
  260. printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
  261. free_page((unsigned long)tmpbuf);
  262. #endif
  263. }
  264. static int bfs_fill_super(struct super_block *s, void *data, int silent)
  265. {
  266. struct buffer_head * bh;
  267. struct bfs_super_block * bfs_sb;
  268. struct inode * inode;
  269. unsigned i, imap_len;
  270. struct bfs_sb_info * info;
  271. info = kzalloc(sizeof(*info), GFP_KERNEL);
  272. if (!info)
  273. return -ENOMEM;
  274. s->s_fs_info = info;
  275. sb_set_blocksize(s, BFS_BSIZE);
  276. bh = sb_bread(s, 0);
  277. if(!bh)
  278. goto out;
  279. bfs_sb = (struct bfs_super_block *)bh->b_data;
  280. if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
  281. if (!silent)
  282. printf("No BFS filesystem on %s (magic=%08x)\n",
  283. s->s_id, le32_to_cpu(bfs_sb->s_magic));
  284. goto out;
  285. }
  286. if (BFS_UNCLEAN(bfs_sb, s) && !silent)
  287. printf("%s is unclean, continuing\n", s->s_id);
  288. s->s_magic = BFS_MAGIC;
  289. info->si_sbh = bh;
  290. info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode)
  291. + BFS_ROOT_INO - 1;
  292. imap_len = info->si_lasti/8 + 1;
  293. info->si_imap = kzalloc(imap_len, GFP_KERNEL);
  294. if (!info->si_imap)
  295. goto out;
  296. for (i=0; i<BFS_ROOT_INO; i++)
  297. set_bit(i, info->si_imap);
  298. s->s_op = &bfs_sops;
  299. inode = iget(s, BFS_ROOT_INO);
  300. if (!inode) {
  301. kfree(info->si_imap);
  302. goto out;
  303. }
  304. s->s_root = d_alloc_root(inode);
  305. if (!s->s_root) {
  306. iput(inode);
  307. kfree(info->si_imap);
  308. goto out;
  309. }
  310. info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
  311. info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS;
  312. info->si_freei = 0;
  313. info->si_lf_eblk = 0;
  314. info->si_lf_sblk = 0;
  315. info->si_lf_ioff = 0;
  316. bh = NULL;
  317. for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
  318. struct bfs_inode *di;
  319. int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
  320. int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
  321. unsigned long sblock, eblock;
  322. if (!off) {
  323. brelse(bh);
  324. bh = sb_bread(s, block);
  325. }
  326. if (!bh)
  327. continue;
  328. di = (struct bfs_inode *)bh->b_data + off;
  329. if (!di->i_ino) {
  330. info->si_freei++;
  331. continue;
  332. }
  333. set_bit(i, info->si_imap);
  334. info->si_freeb -= BFS_FILEBLOCKS(di);
  335. sblock = le32_to_cpu(di->i_sblock);
  336. eblock = le32_to_cpu(di->i_eblock);
  337. if (eblock > info->si_lf_eblk) {
  338. info->si_lf_eblk = eblock;
  339. info->si_lf_sblk = sblock;
  340. info->si_lf_ioff = BFS_INO2OFF(i);
  341. }
  342. }
  343. brelse(bh);
  344. if (!(s->s_flags & MS_RDONLY)) {
  345. mark_buffer_dirty(info->si_sbh);
  346. s->s_dirt = 1;
  347. }
  348. dump_imap("read_super", s);
  349. return 0;
  350. out:
  351. brelse(bh);
  352. kfree(info);
  353. s->s_fs_info = NULL;
  354. return -EINVAL;
  355. }
  356. static int bfs_get_sb(struct file_system_type *fs_type,
  357. int flags, const char *dev_name, void *data, struct vfsmount *mnt)
  358. {
  359. return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
  360. }
  361. static struct file_system_type bfs_fs_type = {
  362. .owner = THIS_MODULE,
  363. .name = "bfs",
  364. .get_sb = bfs_get_sb,
  365. .kill_sb = kill_block_super,
  366. .fs_flags = FS_REQUIRES_DEV,
  367. };
  368. static int __init init_bfs_fs(void)
  369. {
  370. int err = init_inodecache();
  371. if (err)
  372. goto out1;
  373. err = register_filesystem(&bfs_fs_type);
  374. if (err)
  375. goto out;
  376. return 0;
  377. out:
  378. destroy_inodecache();
  379. out1:
  380. return err;
  381. }
  382. static void __exit exit_bfs_fs(void)
  383. {
  384. unregister_filesystem(&bfs_fs_type);
  385. destroy_inodecache();
  386. }
  387. module_init(init_bfs_fs)
  388. module_exit(exit_bfs_fs)