Commit | Line | Data |
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e20d96d6 CM |
1 | #include <linux/module.h> |
2 | #include <linux/fs.h> | |
eb60ceac CM |
3 | #include "ctree.h" |
4 | #include "disk-io.h" | |
e089f05c | 5 | #include "transaction.h" |
eb60ceac | 6 | |
e20d96d6 | 7 | static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf) |
eb60ceac | 8 | { |
e20d96d6 CM |
9 | struct btrfs_node *node = btrfs_buffer_node(buf); |
10 | if (buf->b_blocknr != btrfs_header_blocknr(&node->header)) | |
9a8dd150 | 11 | BUG(); |
e20d96d6 | 12 | if (root->node && btrfs_header_parentid(&node->header) != |
df2ce34c | 13 | btrfs_header_parentid(btrfs_buffer_header(root->node))) { |
7f5c1516 | 14 | BUG(); |
df2ce34c | 15 | } |
9a8dd150 | 16 | return 0; |
eb60ceac CM |
17 | } |
18 | ||
e20d96d6 | 19 | struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr) |
ed2ff2cb | 20 | { |
e20d96d6 | 21 | return sb_getblk(root->fs_info->sb, blocknr); |
ed2ff2cb CM |
22 | } |
23 | ||
e20d96d6 | 24 | struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr) |
eb60ceac | 25 | { |
e20d96d6 | 26 | return sb_getblk(root->fs_info->sb, blocknr); |
eb60ceac CM |
27 | } |
28 | ||
e20d96d6 | 29 | struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) |
eb60ceac | 30 | { |
e20d96d6 | 31 | struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr); |
eb60ceac | 32 | |
e20d96d6 CM |
33 | if (!buf) |
34 | return buf; | |
9a8dd150 | 35 | if (check_tree_block(root, buf)) |
cfaa7295 | 36 | BUG(); |
eb60ceac CM |
37 | return buf; |
38 | } | |
39 | ||
e089f05c | 40 | int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
e20d96d6 | 41 | struct buffer_head *buf) |
ed2ff2cb | 42 | { |
e20d96d6 | 43 | mark_buffer_dirty(buf); |
ed2ff2cb CM |
44 | return 0; |
45 | } | |
46 | ||
e089f05c | 47 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
e20d96d6 | 48 | struct buffer_head *buf) |
ed2ff2cb | 49 | { |
e20d96d6 | 50 | clear_buffer_dirty(buf); |
ed2ff2cb CM |
51 | return 0; |
52 | } | |
53 | ||
123abc88 | 54 | static int __setup_root(struct btrfs_super_block *super, |
9f5fae2f CM |
55 | struct btrfs_root *root, |
56 | struct btrfs_fs_info *fs_info, | |
e20d96d6 | 57 | u64 objectid) |
d97e63b6 | 58 | { |
cfaa7295 | 59 | root->node = NULL; |
a28ec197 | 60 | root->commit_root = NULL; |
123abc88 CM |
61 | root->blocksize = btrfs_super_blocksize(super); |
62 | root->ref_cows = 0; | |
9f5fae2f | 63 | root->fs_info = fs_info; |
3768f368 CM |
64 | memset(&root->root_key, 0, sizeof(root->root_key)); |
65 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
66 | return 0; | |
67 | } | |
68 | ||
123abc88 | 69 | static int find_and_setup_root(struct btrfs_super_block *super, |
9f5fae2f CM |
70 | struct btrfs_root *tree_root, |
71 | struct btrfs_fs_info *fs_info, | |
72 | u64 objectid, | |
e20d96d6 | 73 | struct btrfs_root *root) |
3768f368 CM |
74 | { |
75 | int ret; | |
76 | ||
e20d96d6 | 77 | __setup_root(super, root, fs_info, objectid); |
3768f368 CM |
78 | ret = btrfs_find_last_root(tree_root, objectid, |
79 | &root->root_item, &root->root_key); | |
80 | BUG_ON(ret); | |
81 | ||
82 | root->node = read_tree_block(root, | |
83 | btrfs_root_blocknr(&root->root_item)); | |
3768f368 | 84 | BUG_ON(!root->node); |
d97e63b6 CM |
85 | return 0; |
86 | } | |
87 | ||
e20d96d6 CM |
88 | struct btrfs_root *open_ctree(struct super_block *sb, |
89 | struct buffer_head *sb_buffer, | |
90 | struct btrfs_super_block *disk_super) | |
2e635a27 | 91 | { |
e20d96d6 CM |
92 | struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root), |
93 | GFP_NOFS); | |
94 | struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), | |
95 | GFP_NOFS); | |
96 | struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), | |
97 | GFP_NOFS); | |
98 | struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root), | |
99 | GFP_NOFS); | |
100 | struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info), | |
101 | GFP_NOFS); | |
eb60ceac CM |
102 | int ret; |
103 | ||
e20d96d6 CM |
104 | /* FIXME: don't be stupid */ |
105 | if (!btrfs_super_root(disk_super)) | |
106 | return NULL; | |
8ef97622 CM |
107 | init_bit_radix(&fs_info->pinned_radix); |
108 | init_bit_radix(&fs_info->pending_del_radix); | |
9f5fae2f CM |
109 | fs_info->running_transaction = NULL; |
110 | fs_info->fs_root = root; | |
111 | fs_info->tree_root = tree_root; | |
112 | fs_info->extent_root = extent_root; | |
113 | fs_info->inode_root = inode_root; | |
114 | fs_info->last_inode_alloc = 0; | |
115 | fs_info->last_inode_alloc_dirid = 0; | |
e20d96d6 CM |
116 | fs_info->disk_super = disk_super; |
117 | fs_info->sb_buffer = sb_buffer; | |
118 | fs_info->sb = sb; | |
79154b1b | 119 | mutex_init(&fs_info->trans_mutex); |
d561c025 | 120 | mutex_init(&fs_info->fs_mutex); |
9f5fae2f CM |
121 | memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert)); |
122 | memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert)); | |
3768f368 | 123 | |
e20d96d6 CM |
124 | __setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID); |
125 | tree_root->node = read_tree_block(tree_root, | |
126 | btrfs_super_root(disk_super)); | |
3768f368 CM |
127 | BUG_ON(!tree_root->node); |
128 | ||
e20d96d6 CM |
129 | ret = find_and_setup_root(disk_super, tree_root, fs_info, |
130 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); | |
3768f368 CM |
131 | BUG_ON(ret); |
132 | ||
e20d96d6 CM |
133 | ret = find_and_setup_root(disk_super, tree_root, fs_info, |
134 | BTRFS_INODE_MAP_OBJECTID, inode_root); | |
9f5fae2f CM |
135 | BUG_ON(ret); |
136 | ||
e20d96d6 CM |
137 | ret = find_and_setup_root(disk_super, tree_root, fs_info, |
138 | BTRFS_FS_TREE_OBJECTID, root); | |
3768f368 CM |
139 | BUG_ON(ret); |
140 | ||
a28ec197 | 141 | root->commit_root = root->node; |
e20d96d6 | 142 | get_bh(root->node); |
3768f368 | 143 | root->ref_cows = 1; |
293ffd5f | 144 | root->fs_info->generation = root->root_key.offset + 1; |
eb60ceac CM |
145 | return root; |
146 | } | |
147 | ||
e089f05c | 148 | int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root |
79154b1b | 149 | *root) |
eb60ceac | 150 | { |
d5719762 CM |
151 | struct buffer_head *bh = root->fs_info->sb_buffer; |
152 | btrfs_set_super_root(root->fs_info->disk_super, | |
153 | root->fs_info->tree_root->node->b_blocknr); | |
154 | lock_buffer(bh); | |
155 | clear_buffer_dirty(bh); | |
156 | bh->b_end_io = end_buffer_write_sync; | |
157 | get_bh(bh); | |
158 | submit_bh(WRITE, bh); | |
159 | wait_on_buffer(bh); | |
160 | if (!buffer_uptodate(bh)) { | |
161 | WARN_ON(1); | |
162 | return -EIO; | |
cfaa7295 CM |
163 | } |
164 | return 0; | |
165 | } | |
166 | ||
e20d96d6 | 167 | int close_ctree(struct btrfs_root *root) |
cfaa7295 | 168 | { |
3768f368 | 169 | int ret; |
e089f05c CM |
170 | struct btrfs_trans_handle *trans; |
171 | ||
79154b1b CM |
172 | trans = btrfs_start_transaction(root, 1); |
173 | btrfs_commit_transaction(trans, root); | |
174 | /* run commit again to drop the original snapshot */ | |
175 | trans = btrfs_start_transaction(root, 1); | |
176 | btrfs_commit_transaction(trans, root); | |
177 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 178 | BUG_ON(ret); |
79154b1b | 179 | write_ctree_super(NULL, root); |
ed2ff2cb | 180 | |
cfaa7295 | 181 | if (root->node) |
234b63a0 | 182 | btrfs_block_release(root, root->node); |
9f5fae2f CM |
183 | if (root->fs_info->extent_root->node) |
184 | btrfs_block_release(root->fs_info->extent_root, | |
185 | root->fs_info->extent_root->node); | |
186 | if (root->fs_info->inode_root->node) | |
187 | btrfs_block_release(root->fs_info->inode_root, | |
188 | root->fs_info->inode_root->node); | |
189 | if (root->fs_info->tree_root->node) | |
190 | btrfs_block_release(root->fs_info->tree_root, | |
191 | root->fs_info->tree_root->node); | |
234b63a0 | 192 | btrfs_block_release(root, root->commit_root); |
e20d96d6 CM |
193 | btrfs_block_release(root, root->fs_info->sb_buffer); |
194 | kfree(root->fs_info->extent_root); | |
195 | kfree(root->fs_info->inode_root); | |
196 | kfree(root->fs_info->tree_root); | |
197 | kfree(root->fs_info); | |
198 | kfree(root); | |
eb60ceac CM |
199 | return 0; |
200 | } | |
201 | ||
e20d96d6 | 202 | void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf) |
eb60ceac | 203 | { |
e20d96d6 | 204 | brelse(buf); |
eb60ceac CM |
205 | } |
206 |