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"
20 void btrfs_fsinfo_release(struct kobject *obj)
22 struct btrfs_fs_info *fsinfo = container_of(obj,
23 struct btrfs_fs_info, kobj);
27 struct kobj_type btrfs_fsinfo_ktype = {
28 .release = btrfs_fsinfo_release,
31 struct btrfs_iget_args {
33 struct btrfs_root *root;
36 decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL);
38 #define BTRFS_SUPER_MAGIC 0x9123682E
40 static struct inode_operations btrfs_dir_inode_operations;
41 static struct inode_operations btrfs_dir_ro_inode_operations;
42 static struct super_operations btrfs_super_ops;
43 static struct file_operations btrfs_dir_file_operations;
44 static struct inode_operations btrfs_file_inode_operations;
45 static struct address_space_operations btrfs_aops;
46 static struct file_operations btrfs_file_operations;
48 static void btrfs_read_locked_inode(struct inode *inode)
50 struct btrfs_path *path;
51 struct btrfs_inode_item *inode_item;
52 struct btrfs_root *root = BTRFS_I(inode)->root;
53 struct btrfs_key location;
56 path = btrfs_alloc_path();
58 btrfs_init_path(path);
59 mutex_lock(&root->fs_info->fs_mutex);
61 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
62 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
64 btrfs_free_path(path);
67 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
69 struct btrfs_inode_item);
71 inode->i_mode = btrfs_inode_mode(inode_item);
72 inode->i_nlink = btrfs_inode_nlink(inode_item);
73 inode->i_uid = btrfs_inode_uid(inode_item);
74 inode->i_gid = btrfs_inode_gid(inode_item);
75 inode->i_size = btrfs_inode_size(inode_item);
76 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
77 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
78 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
79 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
80 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
81 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
82 inode->i_blocks = btrfs_inode_nblocks(inode_item);
83 inode->i_generation = btrfs_inode_generation(inode_item);
85 btrfs_free_path(path);
88 mutex_unlock(&root->fs_info->fs_mutex);
90 switch (inode->i_mode & S_IFMT) {
93 init_special_inode(inode, inode->i_mode,
94 btrfs_inode_rdev(inode_item));
98 inode->i_mapping->a_ops = &btrfs_aops;
99 inode->i_fop = &btrfs_file_operations;
100 inode->i_op = &btrfs_file_inode_operations;
103 inode->i_fop = &btrfs_dir_file_operations;
104 if (root == root->fs_info->tree_root)
105 inode->i_op = &btrfs_dir_ro_inode_operations;
107 inode->i_op = &btrfs_dir_inode_operations;
110 // inode->i_op = &page_symlink_inode_operations;
116 btrfs_release_path(root, path);
117 btrfs_free_path(path);
118 mutex_unlock(&root->fs_info->fs_mutex);
119 make_bad_inode(inode);
122 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
123 struct btrfs_root *root,
125 struct dentry *dentry)
127 struct btrfs_path *path;
128 const char *name = dentry->d_name.name;
129 int name_len = dentry->d_name.len;
132 struct btrfs_dir_item *di;
134 path = btrfs_alloc_path();
136 btrfs_init_path(path);
137 ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
145 di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
146 struct btrfs_dir_item);
147 objectid = btrfs_disk_key_objectid(&di->location);
149 ret = btrfs_del_item(trans, root, path);
152 btrfs_release_path(root, path);
153 ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
156 ret = btrfs_del_item(trans, root, path);
158 dentry->d_inode->i_ctime = dir->i_ctime;
160 btrfs_release_path(root, path);
161 btrfs_free_path(path);
163 inode_dec_link_count(dentry->d_inode);
164 dir->i_size -= name_len * 2;
165 mark_inode_dirty(dir);
170 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
172 struct btrfs_root *root;
173 struct btrfs_trans_handle *trans;
176 root = BTRFS_I(dir)->root;
177 mutex_lock(&root->fs_info->fs_mutex);
178 trans = btrfs_start_transaction(root, 1);
179 ret = btrfs_unlink_trans(trans, root, dir, dentry);
180 btrfs_end_transaction(trans, root);
181 mutex_unlock(&root->fs_info->fs_mutex);
185 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
187 struct inode *inode = dentry->d_inode;
190 struct btrfs_root *root = BTRFS_I(dir)->root;
191 struct btrfs_path *path;
192 struct btrfs_key key;
193 struct btrfs_trans_handle *trans;
194 struct btrfs_key found_key;
196 struct btrfs_leaf *leaf;
197 char *goodnames = "..";
199 path = btrfs_alloc_path();
201 btrfs_init_path(path);
202 mutex_lock(&root->fs_info->fs_mutex);
203 trans = btrfs_start_transaction(root, 1);
204 key.objectid = inode->i_ino;
205 key.offset = (u64)-1;
208 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
214 if (path->slots[0] == 0) {
219 leaf = btrfs_buffer_leaf(path->nodes[0]);
220 btrfs_disk_key_to_cpu(&found_key,
221 &leaf->items[path->slots[0]].key);
222 found_type = btrfs_key_type(&found_key);
223 if (found_key.objectid != inode->i_ino) {
227 if ((found_type != BTRFS_DIR_ITEM_KEY &&
228 found_type != BTRFS_DIR_INDEX_KEY) ||
229 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
230 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
234 ret = btrfs_del_item(trans, root, path);
237 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
239 btrfs_release_path(root, path);
242 btrfs_release_path(root, path);
244 /* now the directory is empty */
245 err = btrfs_unlink_trans(trans, root, dir, dentry);
250 btrfs_release_path(root, path);
251 btrfs_free_path(path);
252 mutex_unlock(&root->fs_info->fs_mutex);
253 ret = btrfs_end_transaction(trans, root);
259 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
260 struct btrfs_root *root,
263 struct btrfs_path *path;
268 path = btrfs_alloc_path();
270 btrfs_init_path(path);
271 ret = btrfs_lookup_inode(trans, root, path,
272 &BTRFS_I(inode)->location, -1);
274 ret = btrfs_del_item(trans, root, path);
276 btrfs_free_path(path);
280 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
281 struct btrfs_root *root,
285 struct btrfs_path *path;
286 struct btrfs_key key;
287 struct btrfs_disk_key *found_key;
288 struct btrfs_leaf *leaf;
289 struct btrfs_file_extent_item *fi = NULL;
290 u64 extent_start = 0;
291 u64 extent_num_blocks = 0;
294 path = btrfs_alloc_path();
296 /* FIXME, add redo link to tree so we don't leak on crash */
297 key.objectid = inode->i_ino;
298 key.offset = (u64)-1;
301 * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
304 btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
306 btrfs_init_path(path);
307 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
312 BUG_ON(path->slots[0] == 0);
315 leaf = btrfs_buffer_leaf(path->nodes[0]);
316 found_key = &leaf->items[path->slots[0]].key;
317 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
319 if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
320 btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY &&
321 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
323 if (btrfs_disk_key_offset(found_key) < inode->i_size)
325 if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
326 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
328 struct btrfs_file_extent_item);
329 extent_start = btrfs_file_extent_disk_blocknr(fi);
331 btrfs_file_extent_disk_num_blocks(fi);
333 btrfs_file_extent_num_blocks(fi) >> 9;
338 ret = btrfs_del_item(trans, root, path);
340 btrfs_release_path(root, path);
342 ret = btrfs_free_extent(trans, root, extent_start,
343 extent_num_blocks, 0);
349 btrfs_release_path(root, path);
350 btrfs_free_path(path);
354 static void btrfs_delete_inode(struct inode *inode)
356 struct btrfs_trans_handle *trans;
357 struct btrfs_root *root = BTRFS_I(inode)->root;
360 truncate_inode_pages(&inode->i_data, 0);
361 if (is_bad_inode(inode)) {
365 mutex_lock(&root->fs_info->fs_mutex);
366 trans = btrfs_start_transaction(root, 1);
367 if (S_ISREG(inode->i_mode)) {
368 ret = btrfs_truncate_in_trans(trans, root, inode);
371 btrfs_free_inode(trans, root, inode);
372 btrfs_end_transaction(trans, root);
373 mutex_unlock(&root->fs_info->fs_mutex);
379 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
380 struct btrfs_key *location)
382 const char *name = dentry->d_name.name;
383 int namelen = dentry->d_name.len;
384 struct btrfs_dir_item *di;
385 struct btrfs_path *path;
386 struct btrfs_root *root = BTRFS_I(dir)->root;
389 path = btrfs_alloc_path();
391 btrfs_init_path(path);
392 ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
394 if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) {
395 location->objectid = 0;
399 di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
400 struct btrfs_dir_item);
401 btrfs_disk_key_to_cpu(location, &di->location);
403 btrfs_release_path(root, path);
404 btrfs_free_path(path);
408 int fixup_tree_root_location(struct btrfs_root *root,
409 struct btrfs_key *location,
410 struct btrfs_root **sub_root)
412 struct btrfs_path *path;
413 struct btrfs_root_item *ri;
415 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
417 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
420 path = btrfs_alloc_path();
422 mutex_lock(&root->fs_info->fs_mutex);
424 *sub_root = btrfs_read_fs_root(root->fs_info, location);
425 if (IS_ERR(*sub_root))
426 return PTR_ERR(*sub_root);
428 ri = &(*sub_root)->root_item;
429 location->objectid = btrfs_root_dirid(ri);
431 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
432 location->offset = 0;
434 btrfs_free_path(path);
435 mutex_unlock(&root->fs_info->fs_mutex);
439 int btrfs_init_locked_inode(struct inode *inode, void *p)
441 struct btrfs_iget_args *args = p;
442 inode->i_ino = args->ino;
443 BTRFS_I(inode)->root = args->root;
447 int btrfs_find_actor(struct inode *inode, void *opaque)
449 struct btrfs_iget_args *args = opaque;
450 return (args->ino == inode->i_ino &&
451 args->root == BTRFS_I(inode)->root);
454 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
455 struct btrfs_root *root)
458 struct btrfs_iget_args args;
462 inode = iget5_locked(s, objectid, btrfs_find_actor,
463 btrfs_init_locked_inode,
468 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
469 struct nameidata *nd)
471 struct inode * inode;
472 struct btrfs_inode *bi = BTRFS_I(dir);
473 struct btrfs_root *root = bi->root;
474 struct btrfs_root *sub_root = root;
475 struct btrfs_key location;
478 if (dentry->d_name.len > BTRFS_NAME_LEN)
479 return ERR_PTR(-ENAMETOOLONG);
480 mutex_lock(&root->fs_info->fs_mutex);
481 ret = btrfs_inode_by_name(dir, dentry, &location);
482 mutex_unlock(&root->fs_info->fs_mutex);
486 if (location.objectid) {
487 ret = fixup_tree_root_location(root, &location, &sub_root);
491 return ERR_PTR(-ENOENT);
492 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
495 return ERR_PTR(-EACCES);
496 if (inode->i_state & I_NEW) {
497 if (sub_root != root) {
498 ret = radix_tree_insert(
499 &root->fs_info->fs_roots_radix,
500 (unsigned long)sub_root,
502 printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root);
504 sub_root->inode = inode;
506 BTRFS_I(inode)->root = sub_root;
507 memcpy(&BTRFS_I(inode)->location, &location,
509 btrfs_read_locked_inode(inode);
510 unlock_new_inode(inode);
513 return d_splice_alias(inode, dentry);
516 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
518 struct inode *inode = filp->f_path.dentry->d_inode;
519 struct btrfs_root *root = BTRFS_I(inode)->root;
520 struct btrfs_item *item;
521 struct btrfs_dir_item *di;
522 struct btrfs_key key;
523 struct btrfs_path *path;
526 struct btrfs_leaf *leaf;
529 unsigned char d_type = DT_UNKNOWN;
531 int key_type = BTRFS_DIR_INDEX_KEY;
533 /* FIXME, use a real flag for deciding about the key type */
534 if (root->fs_info->tree_root == root)
535 key_type = BTRFS_DIR_ITEM_KEY;
536 mutex_lock(&root->fs_info->fs_mutex);
537 key.objectid = inode->i_ino;
539 btrfs_set_key_type(&key, key_type);
540 key.offset = filp->f_pos;
541 path = btrfs_alloc_path();
542 btrfs_init_path(path);
543 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
548 leaf = btrfs_buffer_leaf(path->nodes[0]);
549 nritems = btrfs_header_nritems(&leaf->header);
550 slot = path->slots[0];
551 if (advance || slot >= nritems) {
552 if (slot >= nritems -1) {
553 ret = btrfs_next_leaf(root, path);
556 leaf = btrfs_buffer_leaf(path->nodes[0]);
557 nritems = btrfs_header_nritems(&leaf->header);
558 slot = path->slots[0];
565 item = leaf->items + slot;
566 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
568 if (key_type == BTRFS_DIR_INDEX_KEY &&
569 btrfs_disk_key_offset(&item->key) > root->highest_inode)
571 if (btrfs_disk_key_type(&item->key) != key_type)
573 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
575 filp->f_pos = btrfs_disk_key_offset(&item->key);
577 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
578 over = filldir(dirent, (const char *)(di + 1),
579 btrfs_dir_name_len(di),
580 btrfs_disk_key_offset(&item->key),
581 btrfs_disk_key_objectid(&di->location), d_type);
589 btrfs_release_path(root, path);
590 btrfs_free_path(path);
591 mutex_unlock(&root->fs_info->fs_mutex);
595 static void btrfs_put_super (struct super_block * sb)
597 struct btrfs_root *root = btrfs_sb(sb);
600 ret = close_ctree(root);
602 printk("close ctree returns %d\n", ret);
604 sb->s_fs_info = NULL;
607 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
609 struct inode * inode;
610 struct dentry * root_dentry;
611 struct btrfs_super_block *disk_super;
612 struct btrfs_root *tree_root;
613 struct btrfs_inode *bi;
615 sb->s_maxbytes = MAX_LFS_FILESIZE;
616 sb->s_magic = BTRFS_SUPER_MAGIC;
617 sb->s_op = &btrfs_super_ops;
620 tree_root = open_ctree(sb);
623 printk("btrfs: open_ctree failed\n");
626 sb->s_fs_info = tree_root;
627 disk_super = tree_root->fs_info->disk_super;
628 printk("read in super total blocks %Lu root %Lu\n",
629 btrfs_super_total_blocks(disk_super),
630 btrfs_super_root_dir(disk_super));
632 inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
635 bi->location.objectid = inode->i_ino;
636 bi->location.offset = 0;
637 bi->location.flags = 0;
638 bi->root = tree_root;
639 btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
643 if (inode->i_state & I_NEW) {
644 btrfs_read_locked_inode(inode);
645 unlock_new_inode(inode);
648 root_dentry = d_alloc_root(inode);
653 sb->s_root = root_dentry;
658 static void fill_inode_item(struct btrfs_inode_item *item,
661 btrfs_set_inode_uid(item, inode->i_uid);
662 btrfs_set_inode_gid(item, inode->i_gid);
663 btrfs_set_inode_size(item, inode->i_size);
664 btrfs_set_inode_mode(item, inode->i_mode);
665 btrfs_set_inode_nlink(item, inode->i_nlink);
666 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
667 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
668 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
669 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
670 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
671 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
672 btrfs_set_inode_nblocks(item, inode->i_blocks);
673 btrfs_set_inode_generation(item, inode->i_generation);
676 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
677 struct btrfs_root *root,
680 struct btrfs_inode_item *inode_item;
681 struct btrfs_path *path;
684 path = btrfs_alloc_path();
686 btrfs_init_path(path);
687 ret = btrfs_lookup_inode(trans, root, path,
688 &BTRFS_I(inode)->location, 1);
695 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
697 struct btrfs_inode_item);
699 fill_inode_item(inode_item, inode);
700 btrfs_mark_buffer_dirty(path->nodes[0]);
703 btrfs_release_path(root, path);
704 btrfs_free_path(path);
708 static int btrfs_write_inode(struct inode *inode, int wait)
710 struct btrfs_root *root = BTRFS_I(inode)->root;
711 struct btrfs_trans_handle *trans;
714 mutex_lock(&root->fs_info->fs_mutex);
715 trans = btrfs_start_transaction(root, 1);
716 ret = btrfs_update_inode(trans, root, inode);
718 btrfs_commit_transaction(trans, root);
720 btrfs_end_transaction(trans, root);
721 mutex_unlock(&root->fs_info->fs_mutex);
725 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
726 struct inode *dir, int mode)
729 struct btrfs_inode_item inode_item;
730 struct btrfs_root *root = BTRFS_I(dir)->root;
731 struct btrfs_key *location;
735 inode = new_inode(dir->i_sb);
737 return ERR_PTR(-ENOMEM);
739 BTRFS_I(inode)->root = BTRFS_I(dir)->root;
740 ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
743 inode->i_uid = current->fsuid;
744 inode->i_gid = current->fsgid;
745 inode->i_mode = mode;
746 inode->i_ino = objectid;
748 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
749 fill_inode_item(&inode_item, inode);
750 location = &BTRFS_I(inode)->location;
751 location->objectid = objectid;
753 location->offset = 0;
754 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
756 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
759 insert_inode_hash(inode);
763 static int btrfs_add_link(struct btrfs_trans_handle *trans,
764 struct dentry *dentry, struct inode *inode)
767 struct btrfs_key key;
768 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
769 key.objectid = inode->i_ino;
771 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
774 ret = btrfs_insert_dir_item(trans, root,
775 dentry->d_name.name, dentry->d_name.len,
776 dentry->d_parent->d_inode->i_ino,
779 dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
780 ret = btrfs_update_inode(trans, root,
781 dentry->d_parent->d_inode);
786 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
787 struct dentry *dentry, struct inode *inode)
789 int err = btrfs_add_link(trans, dentry, inode);
791 d_instantiate(dentry, inode);
799 static int btrfs_create(struct inode *dir, struct dentry *dentry,
800 int mode, struct nameidata *nd)
802 struct btrfs_trans_handle *trans;
803 struct btrfs_root *root = BTRFS_I(dir)->root;
808 mutex_lock(&root->fs_info->fs_mutex);
809 trans = btrfs_start_transaction(root, 1);
810 inode = btrfs_new_inode(trans, dir, mode);
811 err = PTR_ERR(inode);
814 // FIXME mark the inode dirty
815 err = btrfs_add_nondir(trans, dentry, inode);
819 inode->i_mapping->a_ops = &btrfs_aops;
820 inode->i_fop = &btrfs_file_operations;
821 inode->i_op = &btrfs_file_inode_operations;
823 dir->i_sb->s_dirt = 1;
825 btrfs_end_transaction(trans, root);
826 mutex_unlock(&root->fs_info->fs_mutex);
829 inode_dec_link_count(inode);
835 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
836 struct inode *inode, struct inode *dir)
838 struct btrfs_root *root = BTRFS_I(dir)->root;
841 struct btrfs_key key;
846 key.objectid = inode->i_ino;
849 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
851 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
855 key.objectid = dir->i_ino;
856 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
861 ret = btrfs_update_inode(trans, root, inode);
866 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
869 struct btrfs_trans_handle *trans;
870 struct btrfs_root *root = BTRFS_I(dir)->root;
874 mutex_lock(&root->fs_info->fs_mutex);
875 trans = btrfs_start_transaction(root, 1);
877 err = PTR_ERR(trans);
880 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
882 err = PTR_ERR(inode);
886 inode->i_op = &btrfs_dir_inode_operations;
887 inode->i_fop = &btrfs_dir_file_operations;
889 err = btrfs_make_empty_dir(trans, inode, dir);
892 err = btrfs_add_link(trans, dentry, inode);
895 d_instantiate(dentry, inode);
899 btrfs_end_transaction(trans, root);
901 mutex_unlock(&root->fs_info->fs_mutex);
907 static int btrfs_sync_fs(struct super_block *sb, int wait)
909 struct btrfs_trans_handle *trans;
910 struct btrfs_root *root;
916 filemap_flush(root->fs_info->btree_inode->i_mapping);
919 filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
920 mutex_lock(&root->fs_info->fs_mutex);
921 trans = btrfs_start_transaction(root, 1);
922 ret = btrfs_commit_transaction(trans, root);
925 printk("btrfs sync_fs\n");
926 mutex_unlock(&root->fs_info->fs_mutex);
931 static int btrfs_get_block_inline(struct inode *inode, sector_t iblock,
932 struct buffer_head *result, int create)
934 struct btrfs_root *root = btrfs_sb(inode->i_sb);
935 struct btrfs_path *path;
936 struct btrfs_key key;
937 struct btrfs_leaf *leaf;
938 int num_bytes = result->b_size;
948 path = btrfs_alloc_path();
955 pos = iblock << inode->i_blkbits;
956 key.objectid = inode->i_ino;
958 btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
959 ptr = kmap(result->b_page);
961 ptr += (pos & (PAGE_CACHE_SIZE -1));
964 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
972 leaf = btrfs_buffer_leaf(path->nodes[0]);
973 item_size = btrfs_item_size(leaf->items + path->slots[0]);
974 copy_size = min(num_bytes, item_size);
975 data_ptr = btrfs_item_ptr(leaf, path->slots[0], char);
976 WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size);
977 memcpy(ptr, data_ptr, copy_size);
979 num_bytes -= copy_size;
980 WARN_ON(num_bytes < 0);
982 btrfs_release_path(root, path);
983 if (num_bytes != 0) {
984 if (pos >= i_size_read(inode))
985 memset(ptr, 0, num_bytes);
989 set_buffer_uptodate(result);
990 map_bh(result, inode->i_sb, 0);
993 btrfs_free_path(path);
994 kunmap(result->b_page);
999 static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
1000 struct buffer_head *result, int create)
1005 u64 extent_start = 0;
1007 u64 objectid = inode->i_ino;
1008 struct btrfs_path *path;
1009 struct btrfs_root *root = BTRFS_I(inode)->root;
1010 struct btrfs_trans_handle *trans = NULL;
1011 struct btrfs_file_extent_item *item;
1012 struct btrfs_leaf *leaf;
1013 struct btrfs_disk_key *found_key;
1015 path = btrfs_alloc_path();
1017 btrfs_init_path(path);
1019 trans = btrfs_start_transaction(root, 1);
1021 ret = btrfs_lookup_file_extent(trans, root, path,
1023 iblock << inode->i_blkbits, 0);
1030 if (path->slots[0] == 0) {
1031 btrfs_release_path(root, path);
1037 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1038 struct btrfs_file_extent_item);
1039 leaf = btrfs_buffer_leaf(path->nodes[0]);
1040 blocknr = btrfs_file_extent_disk_blocknr(item);
1041 blocknr += btrfs_file_extent_offset(item);
1043 /* exact match found, use it */
1046 map_bh(result, inode->i_sb, blocknr);
1050 /* are we inside the extent that was found? */
1051 found_key = &leaf->items[path->slots[0]].key;
1052 if (btrfs_disk_key_objectid(found_key) != objectid ||
1053 btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
1056 btrfs_release_path(root, path);
1060 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1061 extent_start = extent_start >> inode->i_blkbits;
1062 extent_start += btrfs_file_extent_offset(item);
1063 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
1064 if (iblock >= extent_start && iblock < extent_end) {
1066 map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
1070 /* ok, create a new extent */
1075 ret = btrfs_alloc_file_extent(trans, root, objectid,
1076 iblock << inode->i_blkbits,
1077 1, extent_end, &blocknr);
1082 inode->i_blocks += inode->i_sb->s_blocksize >> 9;
1083 set_buffer_new(result);
1084 map_bh(result, inode->i_sb, blocknr);
1087 btrfs_release_path(root, path);
1088 btrfs_free_path(path);
1090 btrfs_end_transaction(trans, root);
1094 static int btrfs_get_block(struct inode *inode, sector_t iblock,
1095 struct buffer_head *result, int create)
1098 struct btrfs_root *root = BTRFS_I(inode)->root;
1099 mutex_lock(&root->fs_info->fs_mutex);
1100 err = btrfs_get_block_lock(inode, iblock, result, create);
1101 // err = btrfs_get_block_inline(inode, iblock, result, create);
1102 mutex_unlock(&root->fs_info->fs_mutex);
1106 static int btrfs_prepare_write(struct file *file, struct page *page,
1107 unsigned from, unsigned to)
1109 return nobh_prepare_write(page, from, to, btrfs_get_block);
1111 static int btrfs_commit_write(struct file *file, struct page *page,
1112 unsigned from, unsigned to)
1114 return nobh_commit_write(file, page, from, to);
1117 static void btrfs_write_super(struct super_block *sb)
1119 btrfs_sync_fs(sb, 1);
1122 static int btrfs_readpage(struct file *file, struct page *page)
1124 return mpage_readpage(page, btrfs_get_block);
1127 static int btrfs_readpages(struct file *file, struct address_space *mapping,
1128 struct list_head *pages, unsigned nr_pages)
1130 return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
1133 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1135 return nobh_writepage(page, btrfs_get_block, wbc);
1138 static void btrfs_truncate(struct inode *inode)
1140 struct btrfs_root *root = BTRFS_I(inode)->root;
1142 struct btrfs_trans_handle *trans;
1144 if (!S_ISREG(inode->i_mode))
1146 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1149 nobh_truncate_page(inode->i_mapping, inode->i_size);
1151 /* FIXME, add redo link to tree so we don't leak on crash */
1152 mutex_lock(&root->fs_info->fs_mutex);
1153 trans = btrfs_start_transaction(root, 1);
1154 ret = btrfs_truncate_in_trans(trans, root, inode);
1156 ret = btrfs_end_transaction(trans, root);
1158 mutex_unlock(&root->fs_info->fs_mutex);
1159 mark_inode_dirty(inode);
1162 static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
1163 struct page **prepared_pages,
1164 const char __user * buf)
1166 long page_fault = 0;
1168 int offset = pos & (PAGE_CACHE_SIZE - 1);
1170 for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
1171 size_t count = min_t(size_t,
1172 PAGE_CACHE_SIZE - offset, write_bytes);
1173 struct page *page = prepared_pages[i];
1174 fault_in_pages_readable(buf, count);
1176 /* Copy data from userspace to the current page */
1178 page_fault = __copy_from_user(page_address(page) + offset,
1180 /* Flush processor's dcache for this page */
1181 flush_dcache_page(page);
1184 write_bytes -= count;
1189 return page_fault ? -EFAULT : 0;
1192 static void btrfs_drop_pages(struct page **pages, size_t num_pages)
1195 for (i = 0; i < num_pages; i++) {
1198 unlock_page(pages[i]);
1199 mark_page_accessed(pages[i]);
1200 page_cache_release(pages[i]);
1203 static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
1204 struct btrfs_root *root,
1206 struct page **pages,
1216 struct inode *inode = file->f_path.dentry->d_inode;
1218 for (i = 0; i < num_pages; i++) {
1219 offset = pos & (PAGE_CACHE_SIZE -1);
1220 this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
1221 /* FIXME, one block at a time */
1223 mutex_lock(&root->fs_info->fs_mutex);
1224 trans = btrfs_start_transaction(root, 1);
1225 btrfs_csum_file_block(trans, root, inode->i_ino,
1226 pages[i]->index << PAGE_CACHE_SHIFT,
1227 kmap(pages[i]), PAGE_CACHE_SIZE);
1229 SetPageChecked(pages[i]);
1230 ret = btrfs_end_transaction(trans, root);
1232 mutex_unlock(&root->fs_info->fs_mutex);
1234 ret = nobh_commit_write(file, pages[i], offset,
1235 offset + this_write);
1241 WARN_ON(this_write > write_bytes);
1242 write_bytes -= this_write;
1248 static int prepare_pages(struct btrfs_trans_handle *trans,
1249 struct btrfs_root *root,
1251 struct page **pages,
1257 unsigned long index = pos >> PAGE_CACHE_SHIFT;
1258 struct inode *inode = file->f_path.dentry->d_inode;
1263 loff_t isize = i_size_read(inode);
1265 memset(pages, 0, num_pages * sizeof(struct page *));
1267 for (i = 0; i < num_pages; i++) {
1268 pages[i] = grab_cache_page(inode->i_mapping, index + i);
1271 goto failed_release;
1273 offset = pos & (PAGE_CACHE_SIZE -1);
1274 this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
1275 ret = nobh_prepare_write(pages[i], offset,
1276 offset + this_write,
1281 goto failed_truncate;
1283 WARN_ON(this_write > write_bytes);
1284 write_bytes -= this_write;
1289 btrfs_drop_pages(pages, num_pages);
1293 btrfs_drop_pages(pages, num_pages);
1295 vmtruncate(inode, isize);
1299 static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
1300 size_t count, loff_t *ppos)
1303 size_t num_written = 0;
1306 struct inode *inode = file->f_path.dentry->d_inode;
1307 struct btrfs_root *root = BTRFS_I(inode)->root;
1308 struct page *pages[1];
1310 if (file->f_flags & O_DIRECT)
1314 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1315 current->backing_dev_info = inode->i_mapping->backing_dev_info;
1316 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
1321 err = remove_suid(file->f_path.dentry);
1324 file_update_time(file);
1325 mutex_lock(&inode->i_mutex);
1327 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
1328 size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
1329 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
1331 ret = prepare_pages(NULL, root, file, pages, num_pages,
1334 ret = btrfs_copy_from_user(pos, num_pages,
1335 write_bytes, pages, buf);
1338 ret = dirty_and_release_pages(NULL, root, file, pages,
1339 num_pages, pos, write_bytes);
1341 btrfs_drop_pages(pages, num_pages);
1344 count -= write_bytes;
1346 num_written += write_bytes;
1348 balance_dirty_pages_ratelimited(inode->i_mapping);
1351 mutex_unlock(&inode->i_mutex);
1354 current->backing_dev_info = NULL;
1355 return num_written ? num_written : err;
1359 static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode,
1360 struct page *page, loff_t pos,
1361 size_t offset, size_t write_bytes)
1363 struct btrfs_path *path;
1364 struct btrfs_trans_handle *trans;
1365 struct btrfs_key key;
1366 struct btrfs_leaf *leaf;
1367 struct btrfs_key found_key;
1369 size_t copy_size = 0;
1372 size_t num_written = 0;
1374 path = btrfs_alloc_path();
1376 mutex_lock(&root->fs_info->fs_mutex);
1377 trans = btrfs_start_transaction(root, 1);
1378 key.objectid = inode->i_ino;
1380 btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY);
1384 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1390 leaf = btrfs_buffer_leaf(path->nodes[0]);
1391 btrfs_disk_key_to_cpu(&found_key,
1392 &leaf->items[path->slots[0]].key);
1393 copy_size = btrfs_item_size(leaf->items + path->slots[0]);
1394 dst = btrfs_item_ptr(leaf, path->slots[0], char);
1395 copy_size = min(write_bytes, copy_size);
1398 int slot = path->slots[0];
1402 // FIXME find max key
1403 leaf = btrfs_buffer_leaf(path->nodes[0]);
1404 btrfs_disk_key_to_cpu(&found_key,
1405 &leaf->items[slot].key);
1406 if (found_key.objectid != inode->i_ino)
1408 if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY)
1410 copy_size = btrfs_item_size(leaf->items + slot);
1411 if (found_key.offset + copy_size <= pos)
1413 dst = btrfs_item_ptr(leaf, path->slots[0], char);
1414 dst += pos - found_key.offset;
1415 copy_size = copy_size - (pos - found_key.offset);
1416 BUG_ON(copy_size < 0);
1417 copy_size = min(write_bytes, copy_size);
1418 WARN_ON(copy_size == 0);
1422 btrfs_release_path(root, path);
1423 copy_size = min(write_bytes,
1424 (size_t)BTRFS_LEAF_DATA_SIZE(root) -
1425 sizeof(struct btrfs_item) * 4);
1426 ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size);
1428 dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
1429 path->slots[0], char);
1431 WARN_ON(copy_size == 0);
1432 WARN_ON(dst + copy_size >
1433 btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
1434 path->slots[0], char) +
1435 btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items +
1437 btrfs_memcpy(root, path->nodes[0]->b_data, dst,
1438 page_address(page) + offset, copy_size);
1439 mark_buffer_dirty(path->nodes[0]);
1440 btrfs_release_path(root, path);
1442 offset += copy_size;
1443 num_written += copy_size;
1444 write_bytes -= copy_size;
1448 btrfs_free_path(path);
1449 ret = btrfs_end_transaction(trans, root);
1451 mutex_unlock(&root->fs_info->fs_mutex);
1452 return num_written ? num_written : err;
1455 static ssize_t btrfs_file_inline_write(struct file *file,
1456 const char __user *buf,
1457 size_t count, loff_t *ppos)
1460 size_t num_written = 0;
1463 struct inode *inode = file->f_path.dentry->d_inode;
1464 struct btrfs_root *root = BTRFS_I(inode)->root;
1465 unsigned long page_index;
1467 if (file->f_flags & O_DIRECT)
1471 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1472 current->backing_dev_info = inode->i_mapping->backing_dev_info;
1473 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
1478 err = remove_suid(file->f_path.dentry);
1481 file_update_time(file);
1482 mutex_lock(&inode->i_mutex);
1484 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
1485 size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
1488 page_index = pos >> PAGE_CACHE_SHIFT;
1489 page = grab_cache_page(inode->i_mapping, page_index);
1490 if (!PageUptodate(page)) {
1491 ret = mpage_readpage(page, btrfs_get_block);
1495 ret = btrfs_copy_from_user(pos, 1,
1496 write_bytes, &page, buf);
1498 write_bytes = inline_one_page(root, inode, page, pos,
1499 offset, write_bytes);
1500 SetPageUptodate(page);
1501 if (write_bytes > 0 && pos + write_bytes > inode->i_size) {
1502 i_size_write(inode, pos + write_bytes);
1503 mark_inode_dirty(inode);
1505 page_cache_release(page);
1507 if (write_bytes < 0)
1510 count -= write_bytes;
1512 num_written += write_bytes;
1514 balance_dirty_pages_ratelimited(inode->i_mapping);
1518 mutex_unlock(&inode->i_mutex);
1521 current->backing_dev_info = NULL;
1522 return num_written ? num_written : err;
1526 static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
1527 unsigned long offset, unsigned long size)
1530 unsigned long left, count = desc->count;
1531 struct inode *inode = page->mapping->host;
1536 if (!PageChecked(page)) {
1537 /* FIXME, do it per block */
1538 struct btrfs_root *root = BTRFS_I(inode)->root;
1539 int ret = btrfs_csum_verify_file_block(root,
1540 page->mapping->host->i_ino,
1541 page->index << PAGE_CACHE_SHIFT,
1542 kmap(page), PAGE_CACHE_SIZE);
1544 printk("failed to verify ino %lu page %lu\n",
1545 page->mapping->host->i_ino,
1547 memset(page_address(page), 0, PAGE_CACHE_SIZE);
1549 SetPageChecked(page);
1553 * Faults on the destination of a read are common, so do it before
1556 if (!fault_in_pages_writeable(desc->arg.buf, size)) {
1557 kaddr = kmap_atomic(page, KM_USER0);
1558 left = __copy_to_user_inatomic(desc->arg.buf,
1559 kaddr + offset, size);
1560 kunmap_atomic(kaddr, KM_USER0);
1565 /* Do it the slow way */
1567 left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
1572 desc->error = -EFAULT;
1575 desc->count = count - size;
1576 desc->written += size;
1577 desc->arg.buf += size;
1582 * btrfs_file_aio_read - filesystem read routine
1583 * @iocb: kernel I/O control block
1584 * @iov: io vector request
1585 * @nr_segs: number of segments in the iovec
1586 * @pos: current file position
1588 static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
1589 unsigned long nr_segs, loff_t pos)
1591 struct file *filp = iocb->ki_filp;
1595 loff_t *ppos = &iocb->ki_pos;
1598 for (seg = 0; seg < nr_segs; seg++) {
1599 const struct iovec *iv = &iov[seg];
1602 * If any segment has a negative length, or the cumulative
1603 * length ever wraps negative then return -EINVAL.
1605 count += iv->iov_len;
1606 if (unlikely((ssize_t)(count|iv->iov_len) < 0))
1608 if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
1613 count -= iv->iov_len; /* This segment is no good */
1618 for (seg = 0; seg < nr_segs; seg++) {
1619 read_descriptor_t desc;
1622 desc.arg.buf = iov[seg].iov_base;
1623 desc.count = iov[seg].iov_len;
1624 if (desc.count == 0)
1627 do_generic_file_read(filp, ppos, &desc,
1629 retval += desc.written;
1631 retval = retval ?: desc.error;
1639 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
1641 struct btrfs_trans_handle *trans;
1642 struct btrfs_key key;
1643 struct btrfs_root_item new_root_item;
1647 mutex_lock(&root->fs_info->fs_mutex);
1648 trans = btrfs_start_transaction(root, 1);
1651 ret = btrfs_update_inode(trans, root, root->inode);
1654 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1658 memset(&new_root_item, 0, sizeof(new_root_item));
1659 memcpy(&new_root_item, &root->root_item,
1660 sizeof(new_root_item));
1662 key.objectid = objectid;
1665 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1666 btrfs_set_root_blocknr(&new_root_item, root->node->b_blocknr);
1668 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1672 printk("adding snapshot name %.*s root %Lu %Lu %u\n", namelen, name, key.objectid, key.offset, key.flags);
1675 * insert the directory item
1677 key.offset = (u64)-1;
1678 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1680 root->fs_info->sb->s_root->d_inode->i_ino,
1685 ret = btrfs_inc_root_ref(trans, root);
1688 ret = btrfs_commit_transaction(trans, root);
1690 mutex_unlock(&root->fs_info->fs_mutex);
1694 static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
1695 cmd, unsigned long arg)
1697 struct btrfs_root *root = BTRFS_I(inode)->root;
1698 struct btrfs_ioctl_vol_args vol_args;
1702 if (!root->ref_cows)
1705 case BTRFS_IOC_SNAP_CREATE:
1706 if (copy_from_user(&vol_args,
1707 (struct btrfs_ioctl_vol_args __user *)arg,
1710 namelen = strlen(vol_args.name);
1711 if (namelen > BTRFS_VOL_NAME_MAX)
1713 ret = create_snapshot(root, vol_args.name, namelen);
1722 static struct kmem_cache *btrfs_inode_cachep;
1723 struct kmem_cache *btrfs_trans_handle_cachep;
1724 struct kmem_cache *btrfs_transaction_cachep;
1725 struct kmem_cache *btrfs_bit_radix_cachep;
1726 struct kmem_cache *btrfs_path_cachep;
1729 * Called inside transaction, so use GFP_NOFS
1731 static struct inode *btrfs_alloc_inode(struct super_block *sb)
1733 struct btrfs_inode *ei;
1735 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
1738 return &ei->vfs_inode;
1741 static void btrfs_destroy_inode(struct inode *inode)
1743 WARN_ON(!list_empty(&inode->i_dentry));
1744 WARN_ON(inode->i_data.nrpages);
1746 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
1749 static void init_once(void * foo, struct kmem_cache * cachep,
1750 unsigned long flags)
1752 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
1754 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1755 SLAB_CTOR_CONSTRUCTOR) {
1756 inode_init_once(&ei->vfs_inode);
1760 static int init_inodecache(void)
1762 btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
1763 sizeof(struct btrfs_inode),
1764 0, (SLAB_RECLAIM_ACCOUNT|
1767 btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
1768 sizeof(struct btrfs_trans_handle),
1769 0, (SLAB_RECLAIM_ACCOUNT|
1772 btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
1773 sizeof(struct btrfs_transaction),
1774 0, (SLAB_RECLAIM_ACCOUNT|
1777 btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
1778 sizeof(struct btrfs_transaction),
1779 0, (SLAB_RECLAIM_ACCOUNT|
1782 btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
1784 0, (SLAB_RECLAIM_ACCOUNT|
1786 SLAB_DESTROY_BY_RCU),
1788 if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
1789 btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
1794 static void destroy_inodecache(void)
1796 kmem_cache_destroy(btrfs_inode_cachep);
1797 kmem_cache_destroy(btrfs_trans_handle_cachep);
1798 kmem_cache_destroy(btrfs_transaction_cachep);
1799 kmem_cache_destroy(btrfs_bit_radix_cachep);
1800 kmem_cache_destroy(btrfs_path_cachep);
1803 static int btrfs_get_sb(struct file_system_type *fs_type,
1804 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1806 return get_sb_bdev(fs_type, flags, dev_name, data,
1807 btrfs_fill_super, mnt);
1810 static struct file_system_type btrfs_fs_type = {
1811 .owner = THIS_MODULE,
1813 .get_sb = btrfs_get_sb,
1814 .kill_sb = kill_block_super,
1815 .fs_flags = FS_REQUIRES_DEV,
1818 static struct super_operations btrfs_super_ops = {
1819 .statfs = simple_statfs,
1820 .delete_inode = btrfs_delete_inode,
1821 .put_super = btrfs_put_super,
1822 .read_inode = btrfs_read_locked_inode,
1823 .write_super = btrfs_write_super,
1824 .sync_fs = btrfs_sync_fs,
1825 .write_inode = btrfs_write_inode,
1826 .alloc_inode = btrfs_alloc_inode,
1827 .destroy_inode = btrfs_destroy_inode,
1830 static struct inode_operations btrfs_dir_inode_operations = {
1831 .lookup = btrfs_lookup,
1832 .create = btrfs_create,
1833 .unlink = btrfs_unlink,
1834 .mkdir = btrfs_mkdir,
1835 .rmdir = btrfs_rmdir,
1838 static struct inode_operations btrfs_dir_ro_inode_operations = {
1839 .lookup = btrfs_lookup,
1842 static struct file_operations btrfs_dir_file_operations = {
1843 .llseek = generic_file_llseek,
1844 .read = generic_read_dir,
1845 .readdir = btrfs_readdir,
1846 .ioctl = btrfs_ioctl,
1849 static struct address_space_operations btrfs_aops = {
1850 .readpage = btrfs_readpage,
1851 .readpages = btrfs_readpages,
1852 .writepage = btrfs_writepage,
1853 .sync_page = block_sync_page,
1854 .prepare_write = btrfs_prepare_write,
1855 .commit_write = btrfs_commit_write,
1858 static struct inode_operations btrfs_file_inode_operations = {
1859 .truncate = btrfs_truncate,
1862 static struct file_operations btrfs_file_operations = {
1863 .llseek = generic_file_llseek,
1864 .read = do_sync_read,
1865 .aio_read = btrfs_file_aio_read,
1866 .write = btrfs_file_write,
1867 .mmap = generic_file_mmap,
1868 .open = generic_file_open,
1869 .ioctl = btrfs_ioctl,
1872 static int __init init_btrfs_fs(void)
1875 printk("btrfs loaded!\n");
1876 err = init_inodecache();
1879 kset_set_kset_s(&btrfs_subsys, fs_subsys);
1880 err = subsystem_register(&btrfs_subsys);
1883 return register_filesystem(&btrfs_fs_type);
1885 destroy_inodecache();
1889 static void __exit exit_btrfs_fs(void)
1891 destroy_inodecache();
1892 unregister_filesystem(&btrfs_fs_type);
1893 subsystem_unregister(&btrfs_subsys);
1894 printk("btrfs unloaded\n");
1897 module_init(init_btrfs_fs)
1898 module_exit(exit_btrfs_fs)
1900 MODULE_LICENSE("GPL");