1 #include <linux/module.h>
2 #include <linux/buffer_head.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 <linux/mpage.h>
12 #include <linux/swap.h>
13 #include <linux/writeback.h>
16 #include "transaction.h"
17 #include "btrfs_inode.h"
19 #define BTRFS_SUPER_MAGIC 0x9123682E
21 static struct inode_operations btrfs_dir_inode_operations;
22 static struct super_operations btrfs_super_ops;
23 static struct file_operations btrfs_dir_file_operations;
24 static struct inode_operations btrfs_file_inode_operations;
25 static struct address_space_operations btrfs_aops;
26 static struct file_operations btrfs_file_operations;
28 static int check_inode(struct inode *inode)
30 struct btrfs_inode *ei = BTRFS_I(inode);
31 WARN_ON(ei->magic != 0xDEADBEEF);
32 WARN_ON(ei->magic2 != 0xDEADBEAF);
36 static void btrfs_read_locked_inode(struct inode *inode)
38 struct btrfs_path *path;
39 struct btrfs_inode_item *inode_item;
40 struct btrfs_root *root = btrfs_sb(inode->i_sb);
43 path = btrfs_alloc_path();
45 btrfs_init_path(path);
46 mutex_lock(&root->fs_info->fs_mutex);
49 ret = btrfs_lookup_inode(NULL, root, path, inode->i_ino, 0);
51 btrfs_release_path(root, path);
52 btrfs_free_path(path);
53 mutex_unlock(&root->fs_info->fs_mutex);
54 make_bad_inode(inode);
58 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
60 struct btrfs_inode_item);
62 inode->i_mode = btrfs_inode_mode(inode_item);
63 inode->i_nlink = btrfs_inode_nlink(inode_item);
64 inode->i_uid = btrfs_inode_uid(inode_item);
65 inode->i_gid = btrfs_inode_gid(inode_item);
66 inode->i_size = btrfs_inode_size(inode_item);
67 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
68 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
69 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
70 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
71 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
72 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
73 inode->i_blocks = btrfs_inode_nblocks(inode_item);
74 inode->i_generation = btrfs_inode_generation(inode_item);
76 btrfs_release_path(root, path);
77 btrfs_free_path(path);
80 mutex_unlock(&root->fs_info->fs_mutex);
82 switch (inode->i_mode & S_IFMT) {
85 init_special_inode(inode, inode->i_mode,
86 btrfs_inode_rdev(inode_item));
90 inode->i_mapping->a_ops = &btrfs_aops;
91 inode->i_fop = &btrfs_file_operations;
92 inode->i_op = &btrfs_file_inode_operations;
95 inode->i_op = &btrfs_dir_inode_operations;
96 inode->i_fop = &btrfs_dir_file_operations;
99 // inode->i_op = &page_symlink_inode_operations;
106 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
107 struct btrfs_root *root,
109 struct dentry *dentry)
111 struct btrfs_path *path;
112 const char *name = dentry->d_name.name;
113 int name_len = dentry->d_name.len;
116 struct btrfs_dir_item *di;
118 path = btrfs_alloc_path();
120 btrfs_init_path(path);
121 ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
129 di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
130 struct btrfs_dir_item);
131 objectid = btrfs_dir_objectid(di);
133 ret = btrfs_del_item(trans, root, path);
136 btrfs_release_path(root, path);
137 ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
140 ret = btrfs_del_item(trans, root, path);
142 dentry->d_inode->i_ctime = dir->i_ctime;
144 btrfs_release_path(root, path);
145 btrfs_free_path(path);
147 inode_dec_link_count(dentry->d_inode);
148 dir->i_size -= name_len * 2;
149 mark_inode_dirty(dir);
154 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
156 struct btrfs_root *root;
157 struct btrfs_trans_handle *trans;
160 root = btrfs_sb(dir->i_sb);
161 mutex_lock(&root->fs_info->fs_mutex);
162 trans = btrfs_start_transaction(root, 1);
163 ret = btrfs_unlink_trans(trans, root, dir, dentry);
164 btrfs_end_transaction(trans, root);
165 mutex_unlock(&root->fs_info->fs_mutex);
169 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
171 struct inode *inode = dentry->d_inode;
174 struct btrfs_root *root = btrfs_sb(dir->i_sb);
175 struct btrfs_path *path;
176 struct btrfs_key key;
177 struct btrfs_trans_handle *trans;
178 struct btrfs_key found_key;
180 struct btrfs_leaf *leaf;
181 char *goodnames = "..";
183 path = btrfs_alloc_path();
185 btrfs_init_path(path);
186 mutex_lock(&root->fs_info->fs_mutex);
187 trans = btrfs_start_transaction(root, 1);
188 key.objectid = inode->i_ino;
189 key.offset = (u64)-1;
192 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
198 if (path->slots[0] == 0) {
203 leaf = btrfs_buffer_leaf(path->nodes[0]);
204 btrfs_disk_key_to_cpu(&found_key,
205 &leaf->items[path->slots[0]].key);
206 found_type = btrfs_key_type(&found_key);
207 if (found_key.objectid != inode->i_ino) {
211 if ((found_type != BTRFS_DIR_ITEM_KEY &&
212 found_type != BTRFS_DIR_INDEX_KEY) ||
213 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
214 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
218 ret = btrfs_del_item(trans, root, path);
221 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
223 btrfs_release_path(root, path);
226 btrfs_release_path(root, path);
228 /* now the directory is empty */
229 err = btrfs_unlink_trans(trans, root, dir, dentry);
234 btrfs_release_path(root, path);
235 btrfs_free_path(path);
236 mutex_unlock(&root->fs_info->fs_mutex);
237 ret = btrfs_end_transaction(trans, root);
243 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
244 struct btrfs_root *root,
247 u64 objectid = inode->i_ino;
248 struct btrfs_path *path;
249 struct btrfs_inode_map_item *map;
250 struct btrfs_key stat_data_key;
255 path = btrfs_alloc_path();
257 btrfs_init_path(path);
258 ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1);
264 map = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
265 struct btrfs_inode_map_item);
266 btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
267 ret = btrfs_del_item(trans, root->fs_info->inode_root, path);
269 btrfs_release_path(root, path);
271 ret = btrfs_lookup_inode(trans, root, path, objectid, -1);
273 ret = btrfs_del_item(trans, root, path);
276 btrfs_release_path(root, path);
277 btrfs_free_path(path);
281 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
282 struct btrfs_root *root,
286 struct btrfs_path *path;
287 struct btrfs_key key;
288 struct btrfs_disk_key *found_key;
289 struct btrfs_leaf *leaf;
290 struct btrfs_file_extent_item *fi = NULL;
291 u64 extent_start = 0;
292 u64 extent_num_blocks = 0;
295 path = btrfs_alloc_path();
297 /* FIXME, add redo link to tree so we don't leak on crash */
298 key.objectid = inode->i_ino;
299 key.offset = (u64)-1;
302 * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
305 btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
307 btrfs_init_path(path);
308 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
313 BUG_ON(path->slots[0] == 0);
316 leaf = btrfs_buffer_leaf(path->nodes[0]);
317 found_key = &leaf->items[path->slots[0]].key;
318 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
320 if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
321 btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY &&
322 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
324 if (btrfs_disk_key_offset(found_key) < inode->i_size)
326 if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
327 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
329 struct btrfs_file_extent_item);
330 extent_start = btrfs_file_extent_disk_blocknr(fi);
332 btrfs_file_extent_disk_num_blocks(fi);
334 btrfs_file_extent_num_blocks(fi) >> 9;
339 ret = btrfs_del_item(trans, root, path);
341 btrfs_release_path(root, path);
343 ret = btrfs_free_extent(trans, root, extent_start,
344 extent_num_blocks, 0);
350 btrfs_release_path(root, path);
351 btrfs_free_path(path);
355 static void btrfs_delete_inode(struct inode *inode)
357 struct btrfs_trans_handle *trans;
358 struct btrfs_root *root = btrfs_sb(inode->i_sb);
361 truncate_inode_pages(&inode->i_data, 0);
362 if (is_bad_inode(inode)) {
366 mutex_lock(&root->fs_info->fs_mutex);
367 trans = btrfs_start_transaction(root, 1);
368 if (S_ISREG(inode->i_mode)) {
369 ret = btrfs_truncate_in_trans(trans, root, inode);
372 btrfs_free_inode(trans, root, inode);
373 btrfs_end_transaction(trans, root);
374 mutex_unlock(&root->fs_info->fs_mutex);
380 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
383 const char *name = dentry->d_name.name;
384 int namelen = dentry->d_name.len;
385 struct btrfs_dir_item *di;
386 struct btrfs_path *path;
387 struct btrfs_root *root = btrfs_sb(dir->i_sb);
390 path = btrfs_alloc_path();
392 btrfs_init_path(path);
393 ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
395 if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) {
400 di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
401 struct btrfs_dir_item);
402 *ino = btrfs_dir_objectid(di);
404 btrfs_release_path(root, path);
405 btrfs_free_path(path);
410 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
411 struct nameidata *nd)
413 struct inode * inode;
414 struct btrfs_root *root = btrfs_sb(dir->i_sb);
418 if (dentry->d_name.len > BTRFS_NAME_LEN)
419 return ERR_PTR(-ENAMETOOLONG);
420 mutex_lock(&root->fs_info->fs_mutex);
421 ret = btrfs_inode_by_name(dir, dentry, &ino);
422 mutex_unlock(&root->fs_info->fs_mutex);
427 inode = iget(dir->i_sb, ino);
429 return ERR_PTR(-EACCES);
433 return d_splice_alias(inode, dentry);
436 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
438 struct inode *inode = filp->f_path.dentry->d_inode;
439 struct btrfs_root *root = btrfs_sb(inode->i_sb);
440 struct btrfs_item *item;
441 struct btrfs_dir_item *di;
442 struct btrfs_key key;
443 struct btrfs_path *path;
446 struct btrfs_leaf *leaf;
449 unsigned char d_type = DT_UNKNOWN;
452 mutex_lock(&root->fs_info->fs_mutex);
453 key.objectid = inode->i_ino;
455 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
456 key.offset = filp->f_pos;
457 path = btrfs_alloc_path();
458 btrfs_init_path(path);
459 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
465 leaf = btrfs_buffer_leaf(path->nodes[0]);
466 nritems = btrfs_header_nritems(&leaf->header);
467 slot = path->slots[0];
468 if (advance || slot >= nritems) {
469 if (slot >= nritems -1) {
470 ret = btrfs_next_leaf(root, path);
473 leaf = btrfs_buffer_leaf(path->nodes[0]);
474 nritems = btrfs_header_nritems(&leaf->header);
475 slot = path->slots[0];
482 item = leaf->items + slot;
483 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
485 if (btrfs_disk_key_offset(&item->key) >
486 root->fs_info->highest_inode) {
487 printk("stopping at highest inode %Lu\n", root->fs_info->highest_inode);
490 if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY)
492 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
494 filp->f_pos = btrfs_disk_key_offset(&item->key);
496 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
497 over = filldir(dirent, (const char *)(di + 1),
498 btrfs_dir_name_len(di),
499 btrfs_disk_key_offset(&item->key),
500 btrfs_dir_objectid(di), d_type);
508 btrfs_release_path(root, path);
509 btrfs_free_path(path);
510 mutex_unlock(&root->fs_info->fs_mutex);
514 static void btrfs_put_super (struct super_block * sb)
516 struct btrfs_root *root = btrfs_sb(sb);
519 ret = close_ctree(root);
521 printk("close ctree returns %d\n", ret);
523 sb->s_fs_info = NULL;
526 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
528 struct inode * inode;
529 struct dentry * root_dentry;
530 struct btrfs_super_block *disk_super;
531 struct btrfs_root *root;
533 sb->s_maxbytes = MAX_LFS_FILESIZE;
534 sb->s_magic = BTRFS_SUPER_MAGIC;
535 sb->s_op = &btrfs_super_ops;
538 root = open_ctree(sb);
541 printk("btrfs: open_ctree failed\n");
544 sb->s_fs_info = root;
545 disk_super = root->fs_info->disk_super;
546 printk("read in super total blocks %Lu root %Lu\n",
547 btrfs_super_total_blocks(disk_super),
548 btrfs_super_root_dir(disk_super));
550 inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
553 if (inode->i_state & I_NEW) {
554 btrfs_read_locked_inode(inode);
555 unlock_new_inode(inode);
558 root_dentry = d_alloc_root(inode);
563 sb->s_root = root_dentry;
568 static void fill_inode_item(struct btrfs_inode_item *item,
571 btrfs_set_inode_uid(item, inode->i_uid);
572 btrfs_set_inode_gid(item, inode->i_gid);
573 btrfs_set_inode_size(item, inode->i_size);
574 btrfs_set_inode_mode(item, inode->i_mode);
575 btrfs_set_inode_nlink(item, inode->i_nlink);
576 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
577 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
578 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
579 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
580 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
581 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
582 btrfs_set_inode_nblocks(item, inode->i_blocks);
583 btrfs_set_inode_generation(item, inode->i_generation);
587 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
588 struct btrfs_root *root,
591 struct btrfs_inode_item *inode_item;
592 struct btrfs_path *path;
595 path = btrfs_alloc_path();
597 btrfs_init_path(path);
599 ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1);
606 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
608 struct btrfs_inode_item);
610 fill_inode_item(inode_item, inode);
611 btrfs_mark_buffer_dirty(path->nodes[0]);
613 btrfs_release_path(root, path);
614 btrfs_free_path(path);
619 static int btrfs_write_inode(struct inode *inode, int wait)
621 struct btrfs_root *root = btrfs_sb(inode->i_sb);
622 struct btrfs_trans_handle *trans;
625 mutex_lock(&root->fs_info->fs_mutex);
626 trans = btrfs_start_transaction(root, 1);
627 ret = btrfs_update_inode(trans, root, inode);
629 btrfs_commit_transaction(trans, root);
631 btrfs_end_transaction(trans, root);
632 mutex_unlock(&root->fs_info->fs_mutex);
637 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
638 struct inode *dir, int mode)
641 struct btrfs_inode_item inode_item;
642 struct btrfs_root *root = btrfs_sb(dir->i_sb);
643 struct btrfs_key key;
647 inode = new_inode(dir->i_sb);
649 return ERR_PTR(-ENOMEM);
652 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
655 inode->i_uid = current->fsuid;
656 inode->i_gid = current->fsgid;
657 inode->i_mode = mode;
658 inode->i_ino = objectid;
660 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
661 fill_inode_item(&inode_item, inode);
663 key.objectid = objectid;
666 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
667 ret = btrfs_insert_inode_map(trans, root, objectid, &key);
670 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
673 insert_inode_hash(inode);
679 static int btrfs_add_link(struct btrfs_trans_handle *trans,
680 struct dentry *dentry, struct inode *inode)
683 ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
684 dentry->d_name.name, dentry->d_name.len,
685 dentry->d_parent->d_inode->i_ino,
688 dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
689 ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
690 dentry->d_parent->d_inode);
693 check_inode(dentry->d_parent->d_inode);
697 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
698 struct dentry *dentry, struct inode *inode)
700 int err = btrfs_add_link(trans, dentry, inode);
702 d_instantiate(dentry, inode);
711 static int btrfs_create(struct inode *dir, struct dentry *dentry,
712 int mode, struct nameidata *nd)
714 struct btrfs_trans_handle *trans;
715 struct btrfs_root *root = btrfs_sb(dir->i_sb);
720 mutex_lock(&root->fs_info->fs_mutex);
721 trans = btrfs_start_transaction(root, 1);
722 inode = btrfs_new_inode(trans, dir, mode);
723 err = PTR_ERR(inode);
726 // FIXME mark the inode dirty
727 err = btrfs_add_nondir(trans, dentry, inode);
731 inode->i_mapping->a_ops = &btrfs_aops;
732 inode->i_fop = &btrfs_file_operations;
733 inode->i_op = &btrfs_file_inode_operations;
735 dir->i_sb->s_dirt = 1;
737 btrfs_end_transaction(trans, root);
738 mutex_unlock(&root->fs_info->fs_mutex);
743 inode_dec_link_count(inode);
749 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
750 struct inode *inode, struct inode *dir)
752 struct btrfs_root *root = btrfs_sb(inode->i_sb);
758 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
762 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
767 ret = btrfs_update_inode(trans, root, inode);
772 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
775 struct btrfs_trans_handle *trans;
776 struct btrfs_root *root = btrfs_sb(dir->i_sb);
780 mutex_lock(&root->fs_info->fs_mutex);
781 trans = btrfs_start_transaction(root, 1);
783 err = PTR_ERR(trans);
786 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
788 err = PTR_ERR(inode);
792 inode->i_op = &btrfs_dir_inode_operations;
793 inode->i_fop = &btrfs_dir_file_operations;
795 err = btrfs_make_empty_dir(trans, inode, dir);
798 err = btrfs_add_link(trans, dentry, inode);
801 d_instantiate(dentry, inode);
805 btrfs_end_transaction(trans, root);
807 mutex_unlock(&root->fs_info->fs_mutex);
813 static int btrfs_sync_fs(struct super_block *sb, int wait)
815 struct btrfs_trans_handle *trans;
816 struct btrfs_root *root;
822 filemap_flush(root->fs_info->btree_inode->i_mapping);
825 filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
826 mutex_lock(&root->fs_info->fs_mutex);
827 trans = btrfs_start_transaction(root, 1);
828 ret = btrfs_commit_transaction(trans, root);
831 printk("btrfs sync_fs\n");
832 mutex_unlock(&root->fs_info->fs_mutex);
837 static int btrfs_get_block_inline(struct inode *inode, sector_t iblock,
838 struct buffer_head *result, int create)
840 struct btrfs_root *root = btrfs_sb(inode->i_sb);
841 struct btrfs_path *path;
842 struct btrfs_key key;
843 struct btrfs_leaf *leaf;
844 int num_bytes = result->b_size;
854 path = btrfs_alloc_path();
861 pos = iblock << inode->i_blkbits;
862 key.objectid = inode->i_ino;
864 btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
865 ptr = kmap(result->b_page);
867 ptr += (pos & (PAGE_CACHE_SIZE -1));
870 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
878 leaf = btrfs_buffer_leaf(path->nodes[0]);
879 item_size = btrfs_item_size(leaf->items + path->slots[0]);
880 copy_size = min(num_bytes, item_size);
881 data_ptr = btrfs_item_ptr(leaf, path->slots[0], char);
882 WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size);
883 memcpy(ptr, data_ptr, copy_size);
885 num_bytes -= copy_size;
886 WARN_ON(num_bytes < 0);
888 btrfs_release_path(root, path);
889 if (num_bytes != 0) {
890 if (pos >= i_size_read(inode))
891 memset(ptr, 0, num_bytes);
895 set_buffer_uptodate(result);
896 map_bh(result, inode->i_sb, 0);
899 btrfs_free_path(path);
900 kunmap(result->b_page);
905 static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
906 struct buffer_head *result, int create)
911 u64 extent_start = 0;
913 u64 objectid = inode->i_ino;
914 struct btrfs_path *path;
915 struct btrfs_root *root = btrfs_sb(inode->i_sb);
916 struct btrfs_trans_handle *trans = NULL;
917 struct btrfs_file_extent_item *item;
918 struct btrfs_leaf *leaf;
919 struct btrfs_disk_key *found_key;
921 path = btrfs_alloc_path();
923 btrfs_init_path(path);
925 trans = btrfs_start_transaction(root, 1);
927 ret = btrfs_lookup_file_extent(trans, root, path,
929 iblock << inode->i_blkbits, 0);
936 if (path->slots[0] == 0) {
937 btrfs_release_path(root, path);
943 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
944 struct btrfs_file_extent_item);
945 leaf = btrfs_buffer_leaf(path->nodes[0]);
946 blocknr = btrfs_file_extent_disk_blocknr(item);
947 blocknr += btrfs_file_extent_offset(item);
949 /* exact match found, use it */
952 map_bh(result, inode->i_sb, blocknr);
956 /* are we inside the extent that was found? */
957 found_key = &leaf->items[path->slots[0]].key;
958 if (btrfs_disk_key_objectid(found_key) != objectid ||
959 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
962 btrfs_release_path(root, path);
966 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
967 extent_start = extent_start >> inode->i_blkbits;
968 extent_start += btrfs_file_extent_offset(item);
969 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
970 if (iblock >= extent_start && iblock < extent_end) {
972 map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
976 /* ok, create a new extent */
981 ret = btrfs_alloc_file_extent(trans, root, objectid,
982 iblock << inode->i_blkbits,
983 1, extent_end, &blocknr);
988 inode->i_blocks += inode->i_sb->s_blocksize >> 9;
989 set_buffer_new(result);
990 map_bh(result, inode->i_sb, blocknr);
993 btrfs_release_path(root, path);
994 btrfs_free_path(path);
996 btrfs_end_transaction(trans, root);
1000 static int btrfs_get_block(struct inode *inode, sector_t iblock,
1001 struct buffer_head *result, int create)
1004 struct btrfs_root *root = btrfs_sb(inode->i_sb);
1005 mutex_lock(&root->fs_info->fs_mutex);
1006 err = btrfs_get_block_lock(inode, iblock, result, create);
1007 // err = btrfs_get_block_inline(inode, iblock, result, create);
1008 mutex_unlock(&root->fs_info->fs_mutex);
1012 static int btrfs_prepare_write(struct file *file, struct page *page,
1013 unsigned from, unsigned to)
1015 return nobh_prepare_write(page, from, to, btrfs_get_block);
1017 static int btrfs_commit_write(struct file *file, struct page *page,
1018 unsigned from, unsigned to)
1020 return nobh_commit_write(file, page, from, to);
1023 static void btrfs_write_super(struct super_block *sb)
1025 btrfs_sync_fs(sb, 1);
1028 static int btrfs_readpage(struct file *file, struct page *page)
1030 return mpage_readpage(page, btrfs_get_block);
1033 static int btrfs_readpages(struct file *file, struct address_space *mapping,
1034 struct list_head *pages, unsigned nr_pages)
1036 return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
1039 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1041 return nobh_writepage(page, btrfs_get_block, wbc);
1044 static void btrfs_truncate(struct inode *inode)
1046 struct btrfs_root *root = btrfs_sb(inode->i_sb);
1048 struct btrfs_trans_handle *trans;
1050 if (!S_ISREG(inode->i_mode))
1052 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1055 nobh_truncate_page(inode->i_mapping, inode->i_size);
1057 /* FIXME, add redo link to tree so we don't leak on crash */
1058 mutex_lock(&root->fs_info->fs_mutex);
1059 trans = btrfs_start_transaction(root, 1);
1060 ret = btrfs_truncate_in_trans(trans, root, inode);
1062 ret = btrfs_end_transaction(trans, root);
1064 mutex_unlock(&root->fs_info->fs_mutex);
1065 mark_inode_dirty(inode);
1068 static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
1069 struct page **prepared_pages,
1070 const char __user * buf)
1072 long page_fault = 0;
1074 int offset = pos & (PAGE_CACHE_SIZE - 1);
1076 for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
1077 size_t count = min_t(size_t,
1078 PAGE_CACHE_SIZE - offset, write_bytes);
1079 struct page *page = prepared_pages[i];
1080 fault_in_pages_readable(buf, count);
1082 /* Copy data from userspace to the current page */
1084 page_fault = __copy_from_user(page_address(page) + offset,
1086 /* Flush processor's dcache for this page */
1087 flush_dcache_page(page);
1090 write_bytes -= count;
1095 return page_fault ? -EFAULT : 0;
1098 static void btrfs_drop_pages(struct page **pages, size_t num_pages)
1101 for (i = 0; i < num_pages; i++) {
1104 unlock_page(pages[i]);
1105 mark_page_accessed(pages[i]);
1106 page_cache_release(pages[i]);
1109 static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
1110 struct btrfs_root *root,
1112 struct page **pages,
1122 struct inode *inode = file->f_path.dentry->d_inode;
1124 for (i = 0; i < num_pages; i++) {
1125 offset = pos & (PAGE_CACHE_SIZE -1);
1126 this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
1127 /* FIXME, one block at a time */
1129 mutex_lock(&root->fs_info->fs_mutex);
1130 trans = btrfs_start_transaction(root, 1);
1131 btrfs_csum_file_block(trans, root, inode->i_ino,
1132 pages[i]->index << PAGE_CACHE_SHIFT,
1133 kmap(pages[i]), PAGE_CACHE_SIZE);
1135 SetPageChecked(pages[i]);
1136 ret = btrfs_end_transaction(trans, root);
1138 mutex_unlock(&root->fs_info->fs_mutex);
1140 ret = nobh_commit_write(file, pages[i], offset,
1141 offset + this_write);
1147 WARN_ON(this_write > write_bytes);
1148 write_bytes -= this_write;
1154 static int prepare_pages(struct btrfs_trans_handle *trans,
1155 struct btrfs_root *root,
1157 struct page **pages,
1163 unsigned long index = pos >> PAGE_CACHE_SHIFT;
1164 struct inode *inode = file->f_path.dentry->d_inode;
1169 loff_t isize = i_size_read(inode);
1171 memset(pages, 0, num_pages * sizeof(struct page *));
1173 for (i = 0; i < num_pages; i++) {
1174 pages[i] = grab_cache_page(inode->i_mapping, index + i);
1177 goto failed_release;
1179 offset = pos & (PAGE_CACHE_SIZE -1);
1180 this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
1181 ret = nobh_prepare_write(pages[i], offset,
1182 offset + this_write,
1187 goto failed_truncate;
1189 WARN_ON(this_write > write_bytes);
1190 write_bytes -= this_write;
1195 btrfs_drop_pages(pages, num_pages);
1199 btrfs_drop_pages(pages, num_pages);
1201 vmtruncate(inode, isize);
1205 static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
1206 size_t count, loff_t *ppos)
1209 size_t num_written = 0;
1212 struct inode *inode = file->f_path.dentry->d_inode;
1213 struct btrfs_root *root = btrfs_sb(inode->i_sb);
1214 struct page *pages[1];
1216 if (file->f_flags & O_DIRECT)
1220 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1221 current->backing_dev_info = inode->i_mapping->backing_dev_info;
1222 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
1227 err = remove_suid(file->f_path.dentry);
1230 file_update_time(file);
1231 mutex_lock(&inode->i_mutex);
1233 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
1234 size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
1235 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
1237 ret = prepare_pages(NULL, root, file, pages, num_pages,
1240 ret = btrfs_copy_from_user(pos, num_pages,
1241 write_bytes, pages, buf);
1244 ret = dirty_and_release_pages(NULL, root, file, pages,
1245 num_pages, pos, write_bytes);
1247 btrfs_drop_pages(pages, num_pages);
1250 count -= write_bytes;
1252 num_written += write_bytes;
1254 balance_dirty_pages_ratelimited(inode->i_mapping);
1257 mutex_unlock(&inode->i_mutex);
1260 current->backing_dev_info = NULL;
1261 return num_written ? num_written : err;
1265 static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode,
1266 struct page *page, loff_t pos,
1267 size_t offset, size_t write_bytes)
1269 struct btrfs_path *path;
1270 struct btrfs_trans_handle *trans;
1271 struct btrfs_key key;
1272 struct btrfs_leaf *leaf;
1273 struct btrfs_key found_key;
1275 size_t copy_size = 0;
1278 size_t num_written = 0;
1280 path = btrfs_alloc_path();
1282 mutex_lock(&root->fs_info->fs_mutex);
1283 trans = btrfs_start_transaction(root, 1);
1284 key.objectid = inode->i_ino;
1286 btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
1290 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1296 leaf = btrfs_buffer_leaf(path->nodes[0]);
1297 btrfs_disk_key_to_cpu(&found_key,
1298 &leaf->items[path->slots[0]].key);
1299 copy_size = btrfs_item_size(leaf->items + path->slots[0]);
1300 dst = btrfs_item_ptr(leaf, path->slots[0], char);
1301 copy_size = min(write_bytes, copy_size);
1304 int slot = path->slots[0];
1308 // FIXME find max key
1309 leaf = btrfs_buffer_leaf(path->nodes[0]);
1310 btrfs_disk_key_to_cpu(&found_key,
1311 &leaf->items[slot].key);
1312 if (found_key.objectid != inode->i_ino)
1314 if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY)
1316 copy_size = btrfs_item_size(leaf->items + slot);
1317 if (found_key.offset + copy_size <= pos)
1319 dst = btrfs_item_ptr(leaf, path->slots[0], char);
1320 dst += pos - found_key.offset;
1321 copy_size = copy_size - (pos - found_key.offset);
1322 BUG_ON(copy_size < 0);
1323 copy_size = min(write_bytes, copy_size);
1324 WARN_ON(copy_size == 0);
1328 btrfs_release_path(root, path);
1329 copy_size = min(write_bytes,
1330 (size_t)BTRFS_LEAF_DATA_SIZE(root) -
1331 sizeof(struct btrfs_item) * 4);
1332 ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size);
1334 dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
1335 path->slots[0], char);
1337 WARN_ON(copy_size == 0);
1338 WARN_ON(dst + copy_size >
1339 btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
1340 path->slots[0], char) +
1341 btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items +
1343 btrfs_memcpy(root, path->nodes[0]->b_data, dst,
1344 page_address(page) + offset, copy_size);
1345 mark_buffer_dirty(path->nodes[0]);
1346 btrfs_release_path(root, path);
1348 offset += copy_size;
1349 num_written += copy_size;
1350 write_bytes -= copy_size;
1354 btrfs_free_path(path);
1355 ret = btrfs_end_transaction(trans, root);
1357 mutex_unlock(&root->fs_info->fs_mutex);
1358 return num_written ? num_written : err;
1361 static ssize_t btrfs_file_inline_write(struct file *file,
1362 const char __user *buf,
1363 size_t count, loff_t *ppos)
1366 size_t num_written = 0;
1369 struct inode *inode = file->f_path.dentry->d_inode;
1370 struct btrfs_root *root = btrfs_sb(inode->i_sb);
1371 unsigned long page_index;
1373 if (file->f_flags & O_DIRECT)
1377 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1378 current->backing_dev_info = inode->i_mapping->backing_dev_info;
1379 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
1384 err = remove_suid(file->f_path.dentry);
1387 file_update_time(file);
1388 mutex_lock(&inode->i_mutex);
1390 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
1391 size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
1394 page_index = pos >> PAGE_CACHE_SHIFT;
1395 page = grab_cache_page(inode->i_mapping, page_index);
1396 if (!PageUptodate(page)) {
1397 ret = mpage_readpage(page, btrfs_get_block);
1401 ret = btrfs_copy_from_user(pos, 1,
1402 write_bytes, &page, buf);
1404 write_bytes = inline_one_page(root, inode, page, pos,
1405 offset, write_bytes);
1406 SetPageUptodate(page);
1407 if (write_bytes > 0 && pos + write_bytes > inode->i_size) {
1408 i_size_write(inode, pos + write_bytes);
1409 mark_inode_dirty(inode);
1411 page_cache_release(page);
1413 if (write_bytes < 0)
1416 count -= write_bytes;
1418 num_written += write_bytes;
1420 balance_dirty_pages_ratelimited(inode->i_mapping);
1424 mutex_unlock(&inode->i_mutex);
1427 current->backing_dev_info = NULL;
1428 return num_written ? num_written : err;
1432 static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
1433 unsigned long offset, unsigned long size)
1436 unsigned long left, count = desc->count;
1441 if (!PageChecked(page)) {
1442 /* FIXME, do it per block */
1443 struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
1444 int ret = btrfs_csum_verify_file_block(root,
1445 page->mapping->host->i_ino,
1446 page->index << PAGE_CACHE_SHIFT,
1447 kmap(page), PAGE_CACHE_SIZE);
1449 printk("failed to verify ino %lu page %lu\n",
1450 page->mapping->host->i_ino,
1452 memset(page_address(page), 0, PAGE_CACHE_SIZE);
1454 SetPageChecked(page);
1458 * Faults on the destination of a read are common, so do it before
1461 if (!fault_in_pages_writeable(desc->arg.buf, size)) {
1462 kaddr = kmap_atomic(page, KM_USER0);
1463 left = __copy_to_user_inatomic(desc->arg.buf,
1464 kaddr + offset, size);
1465 kunmap_atomic(kaddr, KM_USER0);
1470 /* Do it the slow way */
1472 left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
1477 desc->error = -EFAULT;
1480 desc->count = count - size;
1481 desc->written += size;
1482 desc->arg.buf += size;
1487 * btrfs_file_aio_read - filesystem read routine
1488 * @iocb: kernel I/O control block
1489 * @iov: io vector request
1490 * @nr_segs: number of segments in the iovec
1491 * @pos: current file position
1493 static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
1494 unsigned long nr_segs, loff_t pos)
1496 struct file *filp = iocb->ki_filp;
1500 loff_t *ppos = &iocb->ki_pos;
1503 for (seg = 0; seg < nr_segs; seg++) {
1504 const struct iovec *iv = &iov[seg];
1507 * If any segment has a negative length, or the cumulative
1508 * length ever wraps negative then return -EINVAL.
1510 count += iv->iov_len;
1511 if (unlikely((ssize_t)(count|iv->iov_len) < 0))
1513 if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
1518 count -= iv->iov_len; /* This segment is no good */
1523 for (seg = 0; seg < nr_segs; seg++) {
1524 read_descriptor_t desc;
1527 desc.arg.buf = iov[seg].iov_base;
1528 desc.count = iov[seg].iov_len;
1529 if (desc.count == 0)
1532 do_generic_file_read(filp, ppos, &desc,
1534 retval += desc.written;
1536 retval = retval ?: desc.error;
1544 static struct kmem_cache *btrfs_inode_cachep;
1545 struct kmem_cache *btrfs_trans_handle_cachep;
1546 struct kmem_cache *btrfs_transaction_cachep;
1547 struct kmem_cache *btrfs_bit_radix_cachep;
1548 struct kmem_cache *btrfs_path_cachep;
1551 * Called inside transaction, so use GFP_NOFS
1553 static struct inode *btrfs_alloc_inode(struct super_block *sb)
1555 struct btrfs_inode *ei;
1557 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
1560 ei->magic = 0xDEADBEEF;
1561 ei->magic2 = 0xDEADBEAF;
1562 return &ei->vfs_inode;
1565 static void btrfs_destroy_inode(struct inode *inode)
1567 struct btrfs_inode *ei = BTRFS_I(inode);
1568 WARN_ON(ei->magic != 0xDEADBEEF);
1569 WARN_ON(ei->magic2 != 0xDEADBEAF);
1570 WARN_ON(!list_empty(&inode->i_dentry));
1571 WARN_ON(inode->i_data.nrpages);
1575 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
1578 static void init_once(void * foo, struct kmem_cache * cachep,
1579 unsigned long flags)
1581 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
1583 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1584 SLAB_CTOR_CONSTRUCTOR) {
1585 inode_init_once(&ei->vfs_inode);
1589 static int init_inodecache(void)
1591 btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
1592 sizeof(struct btrfs_inode),
1593 0, (SLAB_RECLAIM_ACCOUNT|
1596 btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
1597 sizeof(struct btrfs_trans_handle),
1598 0, (SLAB_RECLAIM_ACCOUNT|
1601 btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
1602 sizeof(struct btrfs_transaction),
1603 0, (SLAB_RECLAIM_ACCOUNT|
1606 btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
1607 sizeof(struct btrfs_transaction),
1608 0, (SLAB_RECLAIM_ACCOUNT|
1611 btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
1613 0, (SLAB_RECLAIM_ACCOUNT|
1615 SLAB_DESTROY_BY_RCU),
1617 if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
1618 btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
1623 static void destroy_inodecache(void)
1625 kmem_cache_destroy(btrfs_inode_cachep);
1626 kmem_cache_destroy(btrfs_trans_handle_cachep);
1627 kmem_cache_destroy(btrfs_transaction_cachep);
1628 kmem_cache_destroy(btrfs_bit_radix_cachep);
1629 kmem_cache_destroy(btrfs_path_cachep);
1632 static int btrfs_get_sb(struct file_system_type *fs_type,
1633 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1635 return get_sb_bdev(fs_type, flags, dev_name, data,
1636 btrfs_fill_super, mnt);
1639 static struct file_system_type btrfs_fs_type = {
1640 .owner = THIS_MODULE,
1642 .get_sb = btrfs_get_sb,
1643 .kill_sb = kill_block_super,
1644 .fs_flags = FS_REQUIRES_DEV,
1647 static struct super_operations btrfs_super_ops = {
1648 .statfs = simple_statfs,
1649 .delete_inode = btrfs_delete_inode,
1650 .put_super = btrfs_put_super,
1651 .read_inode = btrfs_read_locked_inode,
1652 .write_super = btrfs_write_super,
1653 .sync_fs = btrfs_sync_fs,
1654 .write_inode = btrfs_write_inode,
1655 .alloc_inode = btrfs_alloc_inode,
1656 .destroy_inode = btrfs_destroy_inode,
1659 static struct inode_operations btrfs_dir_inode_operations = {
1660 .lookup = btrfs_lookup,
1661 .create = btrfs_create,
1662 .unlink = btrfs_unlink,
1663 .mkdir = btrfs_mkdir,
1664 .rmdir = btrfs_rmdir,
1667 static struct file_operations btrfs_dir_file_operations = {
1668 .llseek = generic_file_llseek,
1669 .read = generic_read_dir,
1670 .readdir = btrfs_readdir,
1673 static struct address_space_operations btrfs_aops = {
1674 .readpage = btrfs_readpage,
1675 .readpages = btrfs_readpages,
1676 .writepage = btrfs_writepage,
1677 .sync_page = block_sync_page,
1678 .prepare_write = btrfs_prepare_write,
1679 .commit_write = btrfs_commit_write,
1682 static struct inode_operations btrfs_file_inode_operations = {
1683 .truncate = btrfs_truncate,
1686 static struct file_operations btrfs_file_operations = {
1687 .llseek = generic_file_llseek,
1688 .read = do_sync_read,
1689 .aio_read = btrfs_file_aio_read,
1690 .write = btrfs_file_write,
1691 .mmap = generic_file_mmap,
1692 .open = generic_file_open,
1695 static int __init init_btrfs_fs(void)
1698 printk("btrfs loaded!\n");
1699 err = init_inodecache();
1702 return register_filesystem(&btrfs_fs_type);
1705 static void __exit exit_btrfs_fs(void)
1707 destroy_inodecache();
1708 unregister_filesystem(&btrfs_fs_type);
1709 printk("btrfs unloaded\n");
1712 module_init(init_btrfs_fs)
1713 module_exit(exit_btrfs_fs)
1715 MODULE_LICENSE("GPL");