Commit | Line | Data |
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2e635a27 | 1 | #include <linux/module.h> |
e20d96d6 | 2 | #include <linux/buffer_head.h> |
2e635a27 CM |
3 | #include <linux/fs.h> |
4 | #include <linux/pagemap.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/smp_lock.h> | |
10 | #include <linux/backing-dev.h> | |
11 | #include "ctree.h" | |
e20d96d6 | 12 | #include "disk-io.h" |
d5719762 | 13 | #include "transaction.h" |
2e635a27 CM |
14 | |
15 | #define BTRFS_SUPER_MAGIC 0x9123682E | |
e20d96d6 CM |
16 | |
17 | static struct inode_operations btrfs_dir_inode_operations; | |
18 | static struct super_operations btrfs_super_ops; | |
19 | static struct file_operations btrfs_dir_file_operations; | |
20 | ||
2e635a27 CM |
21 | #if 0 |
22 | /* some random number */ | |
23 | ||
24 | static struct super_operations ramfs_ops; | |
2e635a27 CM |
25 | |
26 | static struct backing_dev_info ramfs_backing_dev_info = { | |
27 | .ra_pages = 0, /* No readahead */ | |
28 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK | | |
29 | BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY | | |
30 | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP, | |
31 | }; | |
32 | ||
33 | struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev) | |
34 | { | |
35 | struct inode * inode = new_inode(sb); | |
36 | ||
37 | if (inode) { | |
38 | inode->i_mode = mode; | |
39 | inode->i_uid = current->fsuid; | |
40 | inode->i_gid = current->fsgid; | |
41 | inode->i_blocks = 0; | |
42 | inode->i_mapping->a_ops = &ramfs_aops; | |
43 | inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info; | |
44 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
45 | switch (mode & S_IFMT) { | |
46 | default: | |
47 | init_special_inode(inode, mode, dev); | |
48 | break; | |
49 | case S_IFREG: | |
50 | inode->i_op = &ramfs_file_inode_operations; | |
51 | inode->i_fop = &ramfs_file_operations; | |
52 | break; | |
53 | case S_IFDIR: | |
54 | inode->i_op = &ramfs_dir_inode_operations; | |
55 | inode->i_fop = &simple_dir_operations; | |
56 | ||
57 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
58 | inc_nlink(inode); | |
59 | break; | |
60 | case S_IFLNK: | |
61 | inode->i_op = &page_symlink_inode_operations; | |
62 | break; | |
63 | } | |
64 | } | |
65 | return inode; | |
66 | } | |
67 | ||
68 | /* | |
69 | * File creation. Allocate an inode, and we're done.. | |
70 | */ | |
71 | /* SMP-safe */ | |
72 | static int | |
73 | ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
74 | { | |
75 | struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev); | |
76 | int error = -ENOSPC; | |
77 | ||
78 | if (inode) { | |
79 | if (dir->i_mode & S_ISGID) { | |
80 | inode->i_gid = dir->i_gid; | |
81 | if (S_ISDIR(mode)) | |
82 | inode->i_mode |= S_ISGID; | |
83 | } | |
84 | d_instantiate(dentry, inode); | |
85 | dget(dentry); /* Extra count - pin the dentry in core */ | |
86 | error = 0; | |
87 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
88 | } | |
89 | return error; | |
90 | } | |
91 | ||
92 | static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
93 | { | |
94 | int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
95 | if (!retval) | |
96 | inc_nlink(dir); | |
97 | return retval; | |
98 | } | |
99 | ||
100 | static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
101 | { | |
102 | return ramfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
103 | } | |
104 | ||
105 | static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname) | |
106 | { | |
107 | struct inode *inode; | |
108 | int error = -ENOSPC; | |
109 | ||
110 | inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0); | |
111 | if (inode) { | |
112 | int l = strlen(symname)+1; | |
113 | error = page_symlink(inode, symname, l); | |
114 | if (!error) { | |
115 | if (dir->i_mode & S_ISGID) | |
116 | inode->i_gid = dir->i_gid; | |
117 | d_instantiate(dentry, inode); | |
118 | dget(dentry); | |
119 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
120 | } else | |
121 | iput(inode); | |
122 | } | |
123 | return error; | |
124 | } | |
125 | ||
126 | static struct inode_operations ramfs_dir_inode_operations = { | |
127 | .create = ramfs_create, | |
128 | .lookup = simple_lookup, | |
129 | .link = simple_link, | |
130 | .unlink = simple_unlink, | |
131 | .symlink = ramfs_symlink, | |
132 | .mkdir = ramfs_mkdir, | |
133 | .rmdir = simple_rmdir, | |
134 | .mknod = ramfs_mknod, | |
135 | .rename = simple_rename, | |
136 | }; | |
137 | #endif | |
138 | ||
e20d96d6 | 139 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 140 | { |
e20d96d6 CM |
141 | struct btrfs_path path; |
142 | struct btrfs_inode_item *inode_item; | |
143 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
144 | int ret; | |
e20d96d6 CM |
145 | btrfs_init_path(&path); |
146 | ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); | |
147 | if (ret) { | |
148 | make_bad_inode(inode); | |
78fae27e | 149 | btrfs_release_path(root, &path); |
e20d96d6 CM |
150 | return; |
151 | } | |
152 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
153 | path.slots[0], | |
154 | struct btrfs_inode_item); | |
2e635a27 | 155 | |
e20d96d6 CM |
156 | inode->i_mode = btrfs_inode_mode(inode_item); |
157 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
158 | inode->i_uid = btrfs_inode_uid(inode_item); | |
159 | inode->i_gid = btrfs_inode_gid(inode_item); | |
160 | inode->i_size = btrfs_inode_size(inode_item); | |
161 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
162 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
163 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
164 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
165 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
166 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
167 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
168 | inode->i_generation = btrfs_inode_generation(inode_item); | |
e20d96d6 CM |
169 | btrfs_release_path(root, &path); |
170 | switch (inode->i_mode & S_IFMT) { | |
171 | #if 0 | |
172 | default: | |
173 | init_special_inode(inode, inode->i_mode, | |
174 | btrfs_inode_rdev(inode_item)); | |
175 | break; | |
176 | #endif | |
177 | case S_IFREG: | |
e20d96d6 CM |
178 | break; |
179 | case S_IFDIR: | |
e20d96d6 CM |
180 | inode->i_op = &btrfs_dir_inode_operations; |
181 | inode->i_fop = &btrfs_dir_file_operations; | |
182 | break; | |
183 | case S_IFLNK: | |
e20d96d6 CM |
184 | // inode->i_op = &page_symlink_inode_operations; |
185 | break; | |
2e635a27 | 186 | } |
e20d96d6 | 187 | return; |
2e635a27 CM |
188 | } |
189 | ||
134e9731 CM |
190 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
191 | { | |
192 | struct btrfs_path path; | |
193 | struct btrfs_root *root; | |
194 | struct btrfs_trans_handle *trans; | |
195 | const char *name = dentry->d_name.name; | |
196 | int name_len = dentry->d_name.len; | |
197 | int ret; | |
198 | u64 objectid; | |
199 | struct btrfs_dir_item *di; | |
200 | ||
201 | btrfs_init_path(&path); | |
202 | root = btrfs_sb(dir->i_sb); | |
203 | mutex_lock(&root->fs_info->fs_mutex); | |
204 | trans = btrfs_start_transaction(root, 1); | |
205 | ||
206 | ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino, | |
207 | name, name_len, -1); | |
208 | if (ret < 0) | |
209 | goto err; | |
210 | if (ret > 0) { | |
211 | ret = -ENOENT; | |
212 | goto err; | |
213 | } | |
214 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
215 | struct btrfs_dir_item); | |
216 | objectid = btrfs_dir_objectid(di); | |
217 | ||
218 | ret = btrfs_del_item(trans, root, &path); | |
219 | BUG_ON(ret); | |
220 | dentry->d_inode->i_ctime = dir->i_ctime; | |
221 | err: | |
222 | btrfs_release_path(root, &path); | |
223 | btrfs_end_transaction(trans, root); | |
224 | mutex_unlock(&root->fs_info->fs_mutex); | |
225 | if (ret == 0) | |
226 | inode_dec_link_count(dentry->d_inode); | |
227 | return ret; | |
228 | } | |
229 | ||
230 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
231 | struct btrfs_root *root, | |
232 | struct inode *inode) | |
233 | { | |
234 | u64 objectid = inode->i_ino; | |
235 | struct btrfs_path path; | |
236 | struct btrfs_inode_map_item *map; | |
237 | struct btrfs_key stat_data_key; | |
238 | int ret; | |
239 | clear_inode(inode); | |
240 | btrfs_init_path(&path); | |
241 | ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1); | |
242 | if (ret) { | |
243 | if (ret > 0) | |
244 | ret = -ENOENT; | |
245 | btrfs_release_path(root, &path); | |
246 | goto error; | |
247 | } | |
248 | map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
249 | struct btrfs_inode_map_item); | |
250 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
251 | ret = btrfs_del_item(trans, root->fs_info->inode_root, &path); | |
252 | BUG_ON(ret); | |
253 | btrfs_release_path(root, &path); | |
254 | btrfs_init_path(&path); | |
255 | ||
256 | ret = btrfs_lookup_inode(trans, root, &path, objectid, -1); | |
257 | BUG_ON(ret); | |
258 | ret = btrfs_del_item(trans, root, &path); | |
259 | BUG_ON(ret); | |
260 | btrfs_release_path(root, &path); | |
261 | error: | |
262 | return ret; | |
263 | } | |
264 | ||
265 | static void btrfs_delete_inode(struct inode *inode) | |
266 | { | |
267 | struct btrfs_trans_handle *trans; | |
268 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
269 | truncate_inode_pages(&inode->i_data, 0); | |
270 | if (is_bad_inode(inode)) { | |
271 | goto no_delete; | |
272 | } | |
273 | inode->i_size = 0; | |
274 | if (inode->i_blocks) | |
275 | WARN_ON(1); | |
276 | ||
277 | mutex_lock(&root->fs_info->fs_mutex); | |
278 | trans = btrfs_start_transaction(root, 1); | |
279 | btrfs_free_inode(trans, root, inode); | |
280 | btrfs_end_transaction(trans, root); | |
281 | mutex_unlock(&root->fs_info->fs_mutex); | |
282 | return; | |
283 | no_delete: | |
284 | clear_inode(inode); | |
285 | } | |
286 | ||
287 | ||
e20d96d6 CM |
288 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
289 | ino_t *ino) | |
290 | { | |
291 | const char *name = dentry->d_name.name; | |
292 | int namelen = dentry->d_name.len; | |
293 | struct btrfs_dir_item *di; | |
294 | struct btrfs_path path; | |
295 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
296 | int ret; | |
297 | ||
298 | btrfs_init_path(&path); | |
299 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
300 | namelen, 0); | |
7f5c1516 | 301 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { |
e20d96d6 CM |
302 | *ino = 0; |
303 | goto out; | |
304 | } | |
305 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
306 | struct btrfs_dir_item); | |
307 | *ino = btrfs_dir_objectid(di); | |
308 | out: | |
309 | btrfs_release_path(root, &path); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
314 | struct nameidata *nd) | |
315 | { | |
316 | struct inode * inode; | |
317 | ino_t ino; | |
318 | int ret; | |
319 | ||
320 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
321 | return ERR_PTR(-ENAMETOOLONG); | |
322 | ||
323 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
324 | if (ret < 0) | |
325 | return ERR_PTR(ret); | |
326 | inode = NULL; | |
327 | if (ino) { | |
e20d96d6 CM |
328 | inode = iget(dir->i_sb, ino); |
329 | if (!inode) | |
330 | return ERR_PTR(-EACCES); | |
331 | } | |
332 | return d_splice_alias(inode, dentry); | |
333 | } | |
334 | ||
335 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
336 | { | |
337 | struct inode *inode = filp->f_path.dentry->d_inode; | |
338 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
339 | struct btrfs_item *item; | |
340 | struct btrfs_dir_item *di; | |
341 | struct btrfs_key key; | |
342 | struct btrfs_path path; | |
343 | int ret; | |
344 | u32 nritems; | |
345 | struct btrfs_leaf *leaf; | |
346 | int slot; | |
347 | int advance; | |
348 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 349 | int over = 0; |
e20d96d6 CM |
350 | |
351 | key.objectid = inode->i_ino; | |
e20d96d6 CM |
352 | key.flags = 0; |
353 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
354 | key.offset = filp->f_pos; | |
355 | btrfs_init_path(&path); | |
356 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
357 | if (ret < 0) { | |
358 | goto err; | |
359 | } | |
7f5c1516 | 360 | advance = 0; |
e20d96d6 CM |
361 | while(1) { |
362 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
363 | nritems = btrfs_header_nritems(&leaf->header); | |
364 | slot = path.slots[0]; | |
e20d96d6 | 365 | if (advance) { |
e20d96d6 CM |
366 | if (slot == nritems -1) { |
367 | ret = btrfs_next_leaf(root, &path); | |
368 | if (ret) | |
369 | break; | |
370 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
371 | nritems = btrfs_header_nritems(&leaf->header); | |
372 | slot = path.slots[0]; | |
134e9731 CM |
373 | #if 0 |
374 | page_cache_readahead( | |
375 | inode->i_sb->s_bdev->bd_inode->i_mapping, | |
376 | &filp->f_ra, filp, | |
377 | path.nodes[0]->b_blocknr >> | |
378 | (PAGE_CACHE_SHIFT - inode->i_blkbits), 1); | |
379 | #endif | |
e20d96d6 CM |
380 | } else { |
381 | slot++; | |
382 | path.slots[0]++; | |
383 | } | |
384 | } | |
385 | advance = 1; | |
386 | item = leaf->items + slot; | |
e20d96d6 CM |
387 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
388 | break; | |
389 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
390 | continue; | |
7f5c1516 CM |
391 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
392 | continue; | |
e20d96d6 | 393 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
394 | over = filldir(dirent, (const char *)(di + 1), |
395 | btrfs_dir_name_len(di), | |
396 | btrfs_disk_key_offset(&item->key), | |
397 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
398 | if (over) { |
399 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 400 | break; |
7f5c1516 | 401 | } |
e20d96d6 CM |
402 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
403 | } | |
e20d96d6 CM |
404 | ret = 0; |
405 | err: | |
406 | btrfs_release_path(root, &path); | |
407 | return ret; | |
408 | } | |
409 | ||
410 | static void btrfs_put_super (struct super_block * sb) | |
411 | { | |
412 | struct btrfs_root *root = btrfs_sb(sb); | |
413 | int ret; | |
414 | ||
415 | ret = close_ctree(root); | |
416 | if (ret) { | |
417 | printk("close ctree returns %d\n", ret); | |
418 | } | |
419 | sb->s_fs_info = NULL; | |
420 | } | |
2e635a27 CM |
421 | |
422 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
423 | { | |
424 | struct inode * inode; | |
e20d96d6 CM |
425 | struct dentry * root_dentry; |
426 | struct btrfs_super_block *disk_super; | |
427 | struct buffer_head *bh; | |
428 | struct btrfs_root *root; | |
2e635a27 CM |
429 | |
430 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
431 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
432 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
433 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
e20d96d6 | 434 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 435 | sb->s_time_gran = 1; |
e20d96d6 CM |
436 | |
437 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
438 | if (!bh) { | |
439 | printk("btrfs: unable to read on disk super\n"); | |
440 | return -EIO; | |
441 | } | |
442 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
443 | root = open_ctree(sb, bh, disk_super); | |
444 | sb->s_fs_info = root; | |
445 | if (!root) { | |
446 | printk("btrfs: open_ctree failed\n"); | |
447 | return -EIO; | |
448 | } | |
449 | printk("read in super total blocks %Lu root %Lu\n", | |
450 | btrfs_super_total_blocks(disk_super), | |
451 | btrfs_super_root_dir(disk_super)); | |
452 | ||
453 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
454 | if (!inode) |
455 | return -ENOMEM; | |
e20d96d6 CM |
456 | if (inode->i_state & I_NEW) { |
457 | btrfs_read_locked_inode(inode); | |
458 | unlock_new_inode(inode); | |
459 | } | |
2e635a27 | 460 | |
e20d96d6 CM |
461 | root_dentry = d_alloc_root(inode); |
462 | if (!root_dentry) { | |
2e635a27 CM |
463 | iput(inode); |
464 | return -ENOMEM; | |
465 | } | |
e20d96d6 CM |
466 | sb->s_root = root_dentry; |
467 | ||
2e635a27 CM |
468 | return 0; |
469 | } | |
470 | ||
d5719762 CM |
471 | static void fill_inode_item(struct btrfs_inode_item *item, |
472 | struct inode *inode) | |
473 | { | |
474 | btrfs_set_inode_uid(item, inode->i_uid); | |
475 | btrfs_set_inode_gid(item, inode->i_gid); | |
476 | btrfs_set_inode_size(item, inode->i_size); | |
477 | btrfs_set_inode_mode(item, inode->i_mode); | |
478 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
479 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
480 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
481 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
482 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
483 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
484 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
485 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
486 | btrfs_set_inode_generation(item, inode->i_generation); | |
487 | } | |
488 | ||
489 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
490 | struct inode *dir, int mode) | |
491 | { | |
492 | struct inode *inode; | |
493 | struct btrfs_inode_item inode_item; | |
494 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
495 | struct btrfs_key key; | |
496 | int ret; | |
497 | u64 objectid; | |
498 | ||
499 | inode = new_inode(dir->i_sb); | |
500 | if (!inode) | |
501 | return ERR_PTR(-ENOMEM); | |
502 | ||
503 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
504 | BUG_ON(ret); | |
505 | ||
506 | inode->i_uid = current->fsuid; | |
507 | inode->i_gid = current->fsgid; | |
508 | inode->i_mode = mode; | |
509 | inode->i_ino = objectid; | |
510 | inode->i_blocks = 0; | |
511 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
512 | fill_inode_item(&inode_item, inode); | |
513 | ||
514 | ||
515 | key.objectid = objectid; | |
516 | key.flags = 0; | |
517 | key.offset = 0; | |
518 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
519 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
520 | BUG_ON(ret); | |
521 | ||
522 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
523 | BUG_ON(ret); | |
524 | ||
525 | insert_inode_hash(inode); | |
526 | // FIXME mark_inode_dirty(inode) | |
527 | return inode; | |
528 | } | |
529 | ||
530 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
531 | struct dentry *dentry, struct inode *inode) | |
532 | { | |
533 | int ret; | |
534 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
535 | dentry->d_name.name, dentry->d_name.len, | |
536 | dentry->d_parent->d_inode->i_ino, | |
537 | inode->i_ino, 0); | |
d5719762 CM |
538 | return ret; |
539 | } | |
540 | ||
541 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
542 | struct dentry *dentry, struct inode *inode) | |
543 | { | |
544 | int err = btrfs_add_link(trans, dentry, inode); | |
545 | if (!err) { | |
546 | d_instantiate(dentry, inode); | |
547 | return 0; | |
548 | } | |
d5719762 CM |
549 | return err; |
550 | } | |
551 | ||
552 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
553 | int mode, struct nameidata *nd) | |
554 | { | |
555 | struct btrfs_trans_handle *trans; | |
556 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
557 | struct inode *inode; | |
558 | int err; | |
134e9731 | 559 | int drop_inode = 0; |
d5719762 | 560 | |
d561c025 | 561 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
562 | trans = btrfs_start_transaction(root, 1); |
563 | inode = btrfs_new_inode(trans, dir, mode); | |
564 | err = PTR_ERR(inode); | |
565 | if (IS_ERR(inode)) | |
d561c025 | 566 | goto out_unlock; |
d5719762 CM |
567 | // FIXME mark the inode dirty |
568 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
569 | if (err) |
570 | drop_inode = 1; | |
d5719762 CM |
571 | dir->i_sb->s_dirt = 1; |
572 | btrfs_end_transaction(trans, root); | |
d561c025 CM |
573 | out_unlock: |
574 | mutex_unlock(&root->fs_info->fs_mutex); | |
134e9731 CM |
575 | if (drop_inode) { |
576 | inode_dec_link_count(inode); | |
577 | iput(inode); | |
578 | } | |
d5719762 CM |
579 | return err; |
580 | } | |
581 | ||
d5719762 CM |
582 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
583 | { | |
584 | struct btrfs_trans_handle *trans; | |
585 | struct btrfs_root *root; | |
586 | int ret; | |
df2ce34c | 587 | |
d5719762 | 588 | sb->s_dirt = 0; |
d561c025 CM |
589 | if (!wait) { |
590 | filemap_flush(sb->s_bdev->bd_inode->i_mapping); | |
591 | return 0; | |
592 | } | |
593 | filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping); | |
df2ce34c | 594 | |
d5719762 | 595 | root = btrfs_sb(sb); |
d561c025 | 596 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
597 | trans = btrfs_start_transaction(root, 1); |
598 | ret = btrfs_commit_transaction(trans, root); | |
599 | sb->s_dirt = 0; | |
600 | BUG_ON(ret); | |
601 | printk("btrfs sync_fs\n"); | |
d561c025 | 602 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
603 | return 0; |
604 | } | |
605 | ||
d561c025 CM |
606 | static void btrfs_write_super(struct super_block *sb) |
607 | { | |
608 | btrfs_sync_fs(sb, 1); | |
609 | } | |
610 | ||
611 | ||
2e635a27 CM |
612 | static int btrfs_get_sb(struct file_system_type *fs_type, |
613 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
614 | { | |
615 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
616 | btrfs_fill_super, mnt); | |
617 | } | |
618 | ||
619 | static struct file_system_type btrfs_fs_type = { | |
620 | .owner = THIS_MODULE, | |
621 | .name = "btrfs", | |
622 | .get_sb = btrfs_get_sb, | |
623 | .kill_sb = kill_block_super, | |
624 | .fs_flags = FS_REQUIRES_DEV, | |
625 | }; | |
626 | ||
e20d96d6 CM |
627 | static struct super_operations btrfs_super_ops = { |
628 | .statfs = simple_statfs, | |
134e9731 | 629 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
630 | .put_super = btrfs_put_super, |
631 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
632 | .write_super = btrfs_write_super, |
633 | .sync_fs = btrfs_sync_fs, | |
e20d96d6 CM |
634 | }; |
635 | ||
636 | static struct inode_operations btrfs_dir_inode_operations = { | |
637 | .lookup = btrfs_lookup, | |
d5719762 | 638 | .create = btrfs_create, |
134e9731 | 639 | .unlink = btrfs_unlink, |
e20d96d6 CM |
640 | }; |
641 | ||
642 | static struct file_operations btrfs_dir_file_operations = { | |
643 | .llseek = generic_file_llseek, | |
644 | .read = generic_read_dir, | |
645 | .readdir = btrfs_readdir, | |
646 | }; | |
647 | ||
648 | ||
2e635a27 CM |
649 | static int __init init_btrfs_fs(void) |
650 | { | |
651 | printk("btrfs loaded!\n"); | |
652 | return register_filesystem(&btrfs_fs_type); | |
653 | } | |
654 | ||
655 | static void __exit exit_btrfs_fs(void) | |
656 | { | |
657 | unregister_filesystem(&btrfs_fs_type); | |
658 | printk("btrfs unloaded\n"); | |
659 | } | |
660 | ||
661 | module_init(init_btrfs_fs) | |
662 | module_exit(exit_btrfs_fs) | |
663 | ||
664 | MODULE_LICENSE("GPL"); |