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