Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1 | #include <linux/module.h> |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2 | #include <linux/buffer_head.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 3 | #include <linux/fs.h> |
| 4 | #include <linux/pagemap.h> |
| 5 | #include <linux/highmem.h> |
| 6 | #include <linux/time.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/smp_lock.h> |
| 10 | #include <linux/backing-dev.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 11 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 12 | #include <linux/swap.h> |
| 13 | #include <linux/writeback.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 14 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 15 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 16 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 17 | #include "btrfs_inode.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 18 | |
| 19 | #define BTRFS_SUPER_MAGIC 0x9123682E |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 20 | |
| 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; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 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; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 27 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 28 | static int check_inode(struct inode *inode) |
| 29 | { |
| 30 | struct btrfs_inode *ei = BTRFS_I(inode); |
| 31 | WARN_ON(ei->magic != 0xDEADBEEF); |
| 32 | WARN_ON(ei->magic2 != 0xDEADBEAF); |
| 33 | return 0; |
| 34 | } |
| 35 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 36 | static void btrfs_read_locked_inode(struct inode *inode) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 37 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 38 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 39 | struct btrfs_inode_item *inode_item; |
| 40 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 41 | int ret; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 42 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 43 | path = btrfs_alloc_path(); |
| 44 | BUG_ON(!path); |
| 45 | btrfs_init_path(path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 46 | mutex_lock(&root->fs_info->fs_mutex); |
| 47 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 48 | check_inode(inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 49 | ret = btrfs_lookup_inode(NULL, root, path, inode->i_ino, 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 50 | if (ret) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 51 | btrfs_release_path(root, path); |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 52 | btrfs_free_path(path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 53 | mutex_unlock(&root->fs_info->fs_mutex); |
| 54 | make_bad_inode(inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 55 | return; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 56 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 57 | check_inode(inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 58 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 59 | path->slots[0], |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 60 | struct btrfs_inode_item); |
| 61 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 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); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 75 | |
| 76 | btrfs_release_path(root, path); |
| 77 | btrfs_free_path(path); |
| 78 | inode_item = NULL; |
| 79 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 80 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 81 | check_inode(inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 82 | switch (inode->i_mode & S_IFMT) { |
| 83 | #if 0 |
| 84 | default: |
| 85 | init_special_inode(inode, inode->i_mode, |
| 86 | btrfs_inode_rdev(inode_item)); |
| 87 | break; |
| 88 | #endif |
| 89 | case S_IFREG: |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 90 | inode->i_mapping->a_ops = &btrfs_aops; |
| 91 | inode->i_fop = &btrfs_file_operations; |
| 92 | inode->i_op = &btrfs_file_inode_operations; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 93 | break; |
| 94 | case S_IFDIR: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 95 | inode->i_op = &btrfs_dir_inode_operations; |
| 96 | inode->i_fop = &btrfs_dir_file_operations; |
| 97 | break; |
| 98 | case S_IFLNK: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 99 | // inode->i_op = &page_symlink_inode_operations; |
| 100 | break; |
| 101 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 102 | check_inode(inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 103 | return; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 104 | } |
| 105 | |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 106 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
| 107 | struct btrfs_root *root, |
| 108 | struct inode *dir, |
| 109 | struct dentry *dentry) |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 110 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 111 | struct btrfs_path *path; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 112 | const char *name = dentry->d_name.name; |
| 113 | int name_len = dentry->d_name.len; |
| 114 | int ret; |
| 115 | u64 objectid; |
| 116 | struct btrfs_dir_item *di; |
| 117 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 118 | path = btrfs_alloc_path(); |
| 119 | BUG_ON(!path); |
| 120 | btrfs_init_path(path); |
| 121 | ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 122 | name, name_len, -1); |
| 123 | if (ret < 0) |
| 124 | goto err; |
| 125 | if (ret > 0) { |
| 126 | ret = -ENOENT; |
| 127 | goto err; |
| 128 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 129 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 130 | struct btrfs_dir_item); |
| 131 | objectid = btrfs_dir_objectid(di); |
| 132 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 133 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 134 | BUG_ON(ret); |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 135 | |
| 136 | btrfs_release_path(root, path); |
| 137 | ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
| 138 | objectid, -1); |
| 139 | BUG_ON(ret); |
| 140 | ret = btrfs_del_item(trans, root, path); |
| 141 | BUG_ON(ret); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 142 | dentry->d_inode->i_ctime = dir->i_ctime; |
| 143 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 144 | btrfs_release_path(root, path); |
| 145 | btrfs_free_path(path); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 146 | if (ret == 0) { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 147 | inode_dec_link_count(dentry->d_inode); |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 148 | dir->i_size -= name_len * 2; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 149 | mark_inode_dirty(dir); |
| 150 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 151 | return ret; |
| 152 | } |
| 153 | |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 154 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 155 | { |
| 156 | struct btrfs_root *root; |
| 157 | struct btrfs_trans_handle *trans; |
| 158 | int ret; |
| 159 | |
| 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); |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 170 | { |
| 171 | struct inode *inode = dentry->d_inode; |
| 172 | int err; |
| 173 | int ret; |
| 174 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 175 | struct btrfs_path *path; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 176 | struct btrfs_key key; |
| 177 | struct btrfs_trans_handle *trans; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 178 | struct btrfs_key found_key; |
| 179 | int found_type; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 180 | struct btrfs_leaf *leaf; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 181 | char *goodnames = ".."; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 182 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 183 | path = btrfs_alloc_path(); |
| 184 | BUG_ON(!path); |
| 185 | btrfs_init_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 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; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 190 | key.flags = (u32)-1; |
| 191 | while(1) { |
| 192 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 193 | if (ret < 0) { |
| 194 | err = ret; |
| 195 | goto out; |
| 196 | } |
| 197 | BUG_ON(ret == 0); |
| 198 | if (path->slots[0] == 0) { |
| 199 | err = -ENOENT; |
| 200 | goto out; |
| 201 | } |
| 202 | path->slots[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) { |
| 208 | err = -ENOENT; |
| 209 | goto out; |
| 210 | } |
| 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))) { |
| 215 | err = -ENOTEMPTY; |
| 216 | goto out; |
| 217 | } |
| 218 | ret = btrfs_del_item(trans, root, path); |
| 219 | BUG_ON(ret); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 220 | |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 221 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
| 222 | break; |
| 223 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 224 | } |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 225 | ret = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 226 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 227 | |
| 228 | /* now the directory is empty */ |
| 229 | err = btrfs_unlink_trans(trans, root, dir, dentry); |
| 230 | if (!err) { |
| 231 | inode->i_size = 0; |
| 232 | } |
| 233 | out: |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 234 | btrfs_release_path(root, path); |
| 235 | btrfs_free_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 236 | mutex_unlock(&root->fs_info->fs_mutex); |
| 237 | ret = btrfs_end_transaction(trans, root); |
| 238 | if (ret && !err) |
| 239 | err = ret; |
| 240 | return err; |
| 241 | } |
| 242 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 243 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
| 244 | struct btrfs_root *root, |
| 245 | struct inode *inode) |
| 246 | { |
| 247 | u64 objectid = inode->i_ino; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 248 | struct btrfs_path *path; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 249 | struct btrfs_inode_map_item *map; |
| 250 | struct btrfs_key stat_data_key; |
| 251 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 252 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 253 | clear_inode(inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 254 | |
| 255 | path = btrfs_alloc_path(); |
| 256 | BUG_ON(!path); |
| 257 | btrfs_init_path(path); |
| 258 | ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 259 | if (ret) { |
| 260 | if (ret > 0) |
| 261 | ret = -ENOENT; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 262 | goto error; |
| 263 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 264 | map = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 265 | struct btrfs_inode_map_item); |
| 266 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 267 | ret = btrfs_del_item(trans, root->fs_info->inode_root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 268 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 269 | btrfs_release_path(root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 270 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 271 | ret = btrfs_lookup_inode(trans, root, path, objectid, -1); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 272 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 273 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 274 | BUG_ON(ret); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 275 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 276 | btrfs_release_path(root, path); |
| 277 | btrfs_free_path(path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 278 | return ret; |
| 279 | } |
| 280 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 281 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
| 282 | struct btrfs_root *root, |
| 283 | struct inode *inode) |
| 284 | { |
| 285 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 286 | struct btrfs_path *path; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 287 | struct btrfs_key key; |
| 288 | struct btrfs_disk_key *found_key; |
| 289 | struct btrfs_leaf *leaf; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 290 | struct btrfs_file_extent_item *fi = NULL; |
| 291 | u64 extent_start = 0; |
| 292 | u64 extent_num_blocks = 0; |
| 293 | int found_extent; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 294 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 295 | path = btrfs_alloc_path(); |
| 296 | BUG_ON(!path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 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; |
| 300 | key.flags = 0; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 301 | /* |
| 302 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys |
| 303 | * or extent data |
| 304 | */ |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 305 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 306 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 307 | btrfs_init_path(path); |
| 308 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 309 | if (ret < 0) { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 310 | goto error; |
| 311 | } |
| 312 | if (ret > 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 313 | BUG_ON(path->slots[0] == 0); |
| 314 | path->slots[0]--; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 315 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 316 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 317 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 318 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
| 319 | break; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 320 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 321 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 322 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 323 | break; |
| 324 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
| 325 | break; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 326 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 327 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 328 | path->slots[0], |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 329 | struct btrfs_file_extent_item); |
| 330 | extent_start = btrfs_file_extent_disk_blocknr(fi); |
| 331 | extent_num_blocks = |
| 332 | btrfs_file_extent_disk_num_blocks(fi); |
| 333 | inode->i_blocks -= |
| 334 | btrfs_file_extent_num_blocks(fi) >> 9; |
| 335 | found_extent = 1; |
| 336 | } else { |
| 337 | found_extent = 0; |
| 338 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 339 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 340 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 341 | btrfs_release_path(root, path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 342 | if (found_extent) { |
| 343 | ret = btrfs_free_extent(trans, root, extent_start, |
| 344 | extent_num_blocks, 0); |
| 345 | BUG_ON(ret); |
| 346 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 347 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 348 | ret = 0; |
| 349 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 350 | btrfs_release_path(root, path); |
| 351 | btrfs_free_path(path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 352 | return ret; |
| 353 | } |
| 354 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 355 | static void btrfs_delete_inode(struct inode *inode) |
| 356 | { |
| 357 | struct btrfs_trans_handle *trans; |
| 358 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 359 | int ret; |
| 360 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 361 | truncate_inode_pages(&inode->i_data, 0); |
| 362 | if (is_bad_inode(inode)) { |
| 363 | goto no_delete; |
| 364 | } |
| 365 | inode->i_size = 0; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 366 | mutex_lock(&root->fs_info->fs_mutex); |
| 367 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 368 | if (S_ISREG(inode->i_mode)) { |
| 369 | ret = btrfs_truncate_in_trans(trans, root, inode); |
| 370 | BUG_ON(ret); |
| 371 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 372 | btrfs_free_inode(trans, root, inode); |
| 373 | btrfs_end_transaction(trans, root); |
| 374 | mutex_unlock(&root->fs_info->fs_mutex); |
| 375 | return; |
| 376 | no_delete: |
| 377 | clear_inode(inode); |
| 378 | } |
| 379 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 380 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
| 381 | ino_t *ino) |
| 382 | { |
| 383 | const char *name = dentry->d_name.name; |
| 384 | int namelen = dentry->d_name.len; |
| 385 | struct btrfs_dir_item *di; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 386 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 387 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 388 | int ret; |
| 389 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 390 | path = btrfs_alloc_path(); |
| 391 | BUG_ON(!path); |
| 392 | btrfs_init_path(path); |
| 393 | ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 394 | namelen, 0); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 395 | if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 396 | *ino = 0; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 397 | ret = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 398 | goto out; |
| 399 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 400 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 401 | struct btrfs_dir_item); |
| 402 | *ino = btrfs_dir_objectid(di); |
| 403 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 404 | btrfs_release_path(root, path); |
| 405 | btrfs_free_path(path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 406 | check_inode(dir); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
| 411 | struct nameidata *nd) |
| 412 | { |
| 413 | struct inode * inode; |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 414 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 415 | ino_t ino; |
| 416 | int ret; |
| 417 | |
| 418 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 419 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 420 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 421 | ret = btrfs_inode_by_name(dir, dentry, &ino); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 422 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 423 | if (ret < 0) |
| 424 | return ERR_PTR(ret); |
| 425 | inode = NULL; |
| 426 | if (ino) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 427 | inode = iget(dir->i_sb, ino); |
| 428 | if (!inode) |
| 429 | return ERR_PTR(-EACCES); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 430 | check_inode(inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 431 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 432 | check_inode(dir); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 433 | return d_splice_alias(inode, dentry); |
| 434 | } |
| 435 | |
| 436 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 437 | { |
| 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; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 443 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 444 | int ret; |
| 445 | u32 nritems; |
| 446 | struct btrfs_leaf *leaf; |
| 447 | int slot; |
| 448 | int advance; |
| 449 | unsigned char d_type = DT_UNKNOWN; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 450 | int over = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 451 | |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 452 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 453 | key.objectid = inode->i_ino; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 454 | key.flags = 0; |
Chris Mason | bae45de | 2007-04-04 21:22:22 -0400 | [diff] [blame] | 455 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 456 | key.offset = filp->f_pos; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 457 | path = btrfs_alloc_path(); |
| 458 | btrfs_init_path(path); |
| 459 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 460 | if (ret < 0) { |
| 461 | goto err; |
| 462 | } |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 463 | advance = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 464 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 465 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 466 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 467 | slot = path->slots[0]; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 468 | if (advance || slot >= nritems) { |
| 469 | if (slot >= nritems -1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 470 | ret = btrfs_next_leaf(root, path); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 471 | if (ret) |
| 472 | break; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 473 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 474 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 475 | slot = path->slots[0]; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 476 | } else { |
| 477 | slot++; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 478 | path->slots[0]++; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 479 | } |
| 480 | } |
| 481 | advance = 1; |
| 482 | item = leaf->items + slot; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 483 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
| 484 | break; |
Chris Mason | 5be6f7f | 2007-04-05 13:35:25 -0400 | [diff] [blame^] | 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); |
| 488 | break; |
| 489 | } |
Chris Mason | bae45de | 2007-04-04 21:22:22 -0400 | [diff] [blame] | 490 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 491 | continue; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 492 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
| 493 | continue; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 494 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 495 | advance = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 496 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 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); |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 501 | if (over) |
| 502 | goto nopos; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 503 | } |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 504 | filp->f_pos++; |
| 505 | nopos: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 506 | ret = 0; |
| 507 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 508 | btrfs_release_path(root, path); |
| 509 | btrfs_free_path(path); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 510 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 511 | return ret; |
| 512 | } |
| 513 | |
| 514 | static void btrfs_put_super (struct super_block * sb) |
| 515 | { |
| 516 | struct btrfs_root *root = btrfs_sb(sb); |
| 517 | int ret; |
| 518 | |
| 519 | ret = close_ctree(root); |
| 520 | if (ret) { |
| 521 | printk("close ctree returns %d\n", ret); |
| 522 | } |
| 523 | sb->s_fs_info = NULL; |
| 524 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 525 | |
| 526 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
| 527 | { |
| 528 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 529 | struct dentry * root_dentry; |
| 530 | struct btrfs_super_block *disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 531 | struct btrfs_root *root; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 532 | |
| 533 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 534 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 535 | sb->s_op = &btrfs_super_ops; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 536 | sb->s_time_gran = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 537 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 538 | root = open_ctree(sb); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 539 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 540 | if (!root) { |
| 541 | printk("btrfs: open_ctree failed\n"); |
| 542 | return -EIO; |
| 543 | } |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 544 | sb->s_fs_info = root; |
| 545 | disk_super = root->fs_info->disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 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)); |
| 549 | |
| 550 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 551 | if (!inode) |
| 552 | return -ENOMEM; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 553 | if (inode->i_state & I_NEW) { |
| 554 | btrfs_read_locked_inode(inode); |
| 555 | unlock_new_inode(inode); |
| 556 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 557 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 558 | root_dentry = d_alloc_root(inode); |
| 559 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 560 | iput(inode); |
| 561 | return -ENOMEM; |
| 562 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 563 | sb->s_root = root_dentry; |
| 564 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 565 | return 0; |
| 566 | } |
| 567 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 568 | static void fill_inode_item(struct btrfs_inode_item *item, |
| 569 | struct inode *inode) |
| 570 | { |
| 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); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 584 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 585 | } |
| 586 | |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 587 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 588 | struct btrfs_root *root, |
| 589 | struct inode *inode) |
| 590 | { |
| 591 | struct btrfs_inode_item *inode_item; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 592 | struct btrfs_path *path; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 593 | int ret; |
| 594 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 595 | path = btrfs_alloc_path(); |
| 596 | BUG_ON(!path); |
| 597 | btrfs_init_path(path); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 598 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 599 | ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 600 | if (ret) { |
| 601 | if (ret > 0) |
| 602 | ret = -ENOENT; |
| 603 | goto failed; |
| 604 | } |
| 605 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 606 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 607 | path->slots[0], |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 608 | struct btrfs_inode_item); |
| 609 | |
| 610 | fill_inode_item(inode_item, inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 611 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 612 | failed: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 613 | btrfs_release_path(root, path); |
| 614 | btrfs_free_path(path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 615 | check_inode(inode); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static int btrfs_write_inode(struct inode *inode, int wait) |
| 620 | { |
| 621 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 622 | struct btrfs_trans_handle *trans; |
| 623 | int ret; |
| 624 | |
| 625 | mutex_lock(&root->fs_info->fs_mutex); |
| 626 | trans = btrfs_start_transaction(root, 1); |
| 627 | ret = btrfs_update_inode(trans, root, inode); |
| 628 | if (wait) |
| 629 | btrfs_commit_transaction(trans, root); |
| 630 | else |
| 631 | btrfs_end_transaction(trans, root); |
| 632 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 633 | check_inode(inode); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 634 | return ret; |
| 635 | } |
| 636 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 637 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
| 638 | struct inode *dir, int mode) |
| 639 | { |
| 640 | struct inode *inode; |
| 641 | struct btrfs_inode_item inode_item; |
| 642 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 643 | struct btrfs_key key; |
| 644 | int ret; |
| 645 | u64 objectid; |
| 646 | |
| 647 | inode = new_inode(dir->i_sb); |
| 648 | if (!inode) |
| 649 | return ERR_PTR(-ENOMEM); |
| 650 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 651 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 652 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 653 | BUG_ON(ret); |
| 654 | |
| 655 | inode->i_uid = current->fsuid; |
| 656 | inode->i_gid = current->fsgid; |
| 657 | inode->i_mode = mode; |
| 658 | inode->i_ino = objectid; |
| 659 | inode->i_blocks = 0; |
| 660 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
| 661 | fill_inode_item(&inode_item, inode); |
| 662 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 663 | key.objectid = objectid; |
| 664 | key.flags = 0; |
| 665 | key.offset = 0; |
| 666 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 667 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); |
| 668 | BUG_ON(ret); |
| 669 | |
| 670 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); |
| 671 | BUG_ON(ret); |
| 672 | |
| 673 | insert_inode_hash(inode); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 674 | check_inode(inode); |
| 675 | check_inode(dir); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 676 | return inode; |
| 677 | } |
| 678 | |
| 679 | static int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 680 | struct dentry *dentry, struct inode *inode) |
| 681 | { |
| 682 | int ret; |
| 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, |
| 686 | inode->i_ino, 0); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 687 | if (ret == 0) { |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 688 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 689 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), |
| 690 | dentry->d_parent->d_inode); |
| 691 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 692 | check_inode(inode); |
| 693 | check_inode(dentry->d_parent->d_inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 694 | return ret; |
| 695 | } |
| 696 | |
| 697 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
| 698 | struct dentry *dentry, struct inode *inode) |
| 699 | { |
| 700 | int err = btrfs_add_link(trans, dentry, inode); |
| 701 | if (!err) { |
| 702 | d_instantiate(dentry, inode); |
| 703 | return 0; |
| 704 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 705 | if (err > 0) |
| 706 | err = -EEXIST; |
| 707 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 708 | return err; |
| 709 | } |
| 710 | |
| 711 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
| 712 | int mode, struct nameidata *nd) |
| 713 | { |
| 714 | struct btrfs_trans_handle *trans; |
| 715 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 716 | struct inode *inode; |
| 717 | int err; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 718 | int drop_inode = 0; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 719 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 720 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 721 | trans = btrfs_start_transaction(root, 1); |
| 722 | inode = btrfs_new_inode(trans, dir, mode); |
| 723 | err = PTR_ERR(inode); |
| 724 | if (IS_ERR(inode)) |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 725 | goto out_unlock; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 726 | // FIXME mark the inode dirty |
| 727 | err = btrfs_add_nondir(trans, dentry, inode); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 728 | if (err) |
| 729 | drop_inode = 1; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 730 | else { |
| 731 | inode->i_mapping->a_ops = &btrfs_aops; |
| 732 | inode->i_fop = &btrfs_file_operations; |
| 733 | inode->i_op = &btrfs_file_inode_operations; |
| 734 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 735 | dir->i_sb->s_dirt = 1; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 736 | out_unlock: |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 737 | btrfs_end_transaction(trans, root); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 738 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 739 | check_inode(inode); |
| 740 | check_inode(dir); |
| 741 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 742 | if (drop_inode) { |
| 743 | inode_dec_link_count(inode); |
| 744 | iput(inode); |
| 745 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 746 | return err; |
| 747 | } |
| 748 | |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 749 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
| 750 | struct inode *inode, struct inode *dir) |
| 751 | { |
| 752 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 753 | int ret; |
| 754 | char buf[2]; |
| 755 | buf[0] = '.'; |
| 756 | buf[1] = '.'; |
| 757 | |
| 758 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, |
| 759 | inode->i_ino, 1); |
| 760 | if (ret) |
| 761 | goto error; |
| 762 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, |
| 763 | dir->i_ino, 1); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 764 | if (ret) |
| 765 | goto error; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 766 | inode->i_size = 6; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 767 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 768 | error: |
| 769 | return ret; |
| 770 | } |
| 771 | |
| 772 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 773 | { |
| 774 | struct inode *inode; |
| 775 | struct btrfs_trans_handle *trans; |
| 776 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 777 | int err = 0; |
| 778 | int drop_on_err = 0; |
| 779 | |
| 780 | mutex_lock(&root->fs_info->fs_mutex); |
| 781 | trans = btrfs_start_transaction(root, 1); |
| 782 | if (IS_ERR(trans)) { |
| 783 | err = PTR_ERR(trans); |
| 784 | goto out_unlock; |
| 785 | } |
| 786 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); |
| 787 | if (IS_ERR(inode)) { |
| 788 | err = PTR_ERR(inode); |
| 789 | goto out_fail; |
| 790 | } |
| 791 | drop_on_err = 1; |
| 792 | inode->i_op = &btrfs_dir_inode_operations; |
| 793 | inode->i_fop = &btrfs_dir_file_operations; |
| 794 | |
| 795 | err = btrfs_make_empty_dir(trans, inode, dir); |
| 796 | if (err) |
| 797 | goto out_fail; |
| 798 | err = btrfs_add_link(trans, dentry, inode); |
| 799 | if (err) |
| 800 | goto out_fail; |
| 801 | d_instantiate(dentry, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 802 | drop_on_err = 0; |
| 803 | |
| 804 | out_fail: |
| 805 | btrfs_end_transaction(trans, root); |
| 806 | out_unlock: |
| 807 | mutex_unlock(&root->fs_info->fs_mutex); |
| 808 | if (drop_on_err) |
| 809 | iput(inode); |
| 810 | return err; |
| 811 | } |
| 812 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 813 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
| 814 | { |
| 815 | struct btrfs_trans_handle *trans; |
| 816 | struct btrfs_root *root; |
| 817 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 818 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 819 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 820 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 821 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 822 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 823 | return 0; |
| 824 | } |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 825 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 826 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 827 | trans = btrfs_start_transaction(root, 1); |
| 828 | ret = btrfs_commit_transaction(trans, root); |
| 829 | sb->s_dirt = 0; |
| 830 | BUG_ON(ret); |
| 831 | printk("btrfs sync_fs\n"); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 832 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 833 | return 0; |
| 834 | } |
| 835 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 836 | #if 0 |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 837 | static int btrfs_get_block_inline(struct inode *inode, sector_t iblock, |
| 838 | struct buffer_head *result, int create) |
| 839 | { |
| 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; |
| 845 | int item_size; |
| 846 | int ret; |
| 847 | u64 pos; |
| 848 | char *ptr; |
| 849 | int copy_size; |
| 850 | int err = 0; |
| 851 | char *safe_ptr; |
| 852 | char *data_ptr; |
| 853 | |
| 854 | path = btrfs_alloc_path(); |
| 855 | BUG_ON(!path); |
| 856 | |
| 857 | WARN_ON(create); |
| 858 | if (create) { |
| 859 | return 0; |
| 860 | } |
| 861 | pos = iblock << inode->i_blkbits; |
| 862 | key.objectid = inode->i_ino; |
| 863 | key.flags = 0; |
| 864 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); |
| 865 | ptr = kmap(result->b_page); |
| 866 | safe_ptr = ptr; |
| 867 | ptr += (pos & (PAGE_CACHE_SIZE -1)); |
| 868 | again: |
| 869 | key.offset = pos; |
| 870 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 871 | if (ret) { |
| 872 | if (ret < 0) |
| 873 | err = ret; |
| 874 | else |
| 875 | err = 0; |
| 876 | goto out; |
| 877 | } |
| 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); |
| 884 | pos += copy_size; |
| 885 | num_bytes -= copy_size; |
| 886 | WARN_ON(num_bytes < 0); |
| 887 | ptr += copy_size; |
| 888 | btrfs_release_path(root, path); |
| 889 | if (num_bytes != 0) { |
| 890 | if (pos >= i_size_read(inode)) |
| 891 | memset(ptr, 0, num_bytes); |
| 892 | else |
| 893 | goto again; |
| 894 | } |
| 895 | set_buffer_uptodate(result); |
| 896 | map_bh(result, inode->i_sb, 0); |
| 897 | err = 0; |
| 898 | out: |
| 899 | btrfs_free_path(path); |
| 900 | kunmap(result->b_page); |
| 901 | return err; |
| 902 | } |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 903 | #endif |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 904 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 905 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 906 | struct buffer_head *result, int create) |
| 907 | { |
| 908 | int ret; |
| 909 | int err = 0; |
| 910 | u64 blocknr; |
| 911 | u64 extent_start = 0; |
| 912 | u64 extent_end = 0; |
| 913 | u64 objectid = inode->i_ino; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 914 | struct btrfs_path *path; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 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; |
| 920 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 921 | path = btrfs_alloc_path(); |
| 922 | BUG_ON(!path); |
| 923 | btrfs_init_path(path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 924 | if (create) |
| 925 | trans = btrfs_start_transaction(root, 1); |
| 926 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 927 | ret = btrfs_lookup_file_extent(trans, root, path, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 928 | inode->i_ino, |
| 929 | iblock << inode->i_blkbits, 0); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 930 | if (ret < 0) { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 931 | err = ret; |
| 932 | goto out; |
| 933 | } |
| 934 | |
| 935 | if (ret != 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 936 | if (path->slots[0] == 0) { |
| 937 | btrfs_release_path(root, path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 938 | goto allocate; |
| 939 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 940 | path->slots[0]--; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 941 | } |
| 942 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 943 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 944 | struct btrfs_file_extent_item); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 945 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 946 | blocknr = btrfs_file_extent_disk_blocknr(item); |
| 947 | blocknr += btrfs_file_extent_offset(item); |
| 948 | |
| 949 | /* exact match found, use it */ |
| 950 | if (ret == 0) { |
| 951 | err = 0; |
| 952 | map_bh(result, inode->i_sb, blocknr); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 953 | goto out; |
| 954 | } |
| 955 | |
| 956 | /* are we inside the extent that was found? */ |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 957 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 958 | if (btrfs_disk_key_objectid(found_key) != objectid || |
| 959 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { |
| 960 | extent_end = 0; |
| 961 | extent_start = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 962 | btrfs_release_path(root, path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 963 | goto allocate; |
| 964 | } |
| 965 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 966 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 967 | extent_start = extent_start >> inode->i_blkbits; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 968 | extent_start += btrfs_file_extent_offset(item); |
| 969 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 970 | if (iblock >= extent_start && iblock < extent_end) { |
| 971 | err = 0; |
| 972 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); |
| 973 | goto out; |
| 974 | } |
| 975 | allocate: |
| 976 | /* ok, create a new extent */ |
| 977 | if (!create) { |
| 978 | err = 0; |
| 979 | goto out; |
| 980 | } |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 981 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
| 982 | iblock << inode->i_blkbits, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 983 | 1, extent_end, &blocknr); |
| 984 | if (ret) { |
| 985 | err = ret; |
| 986 | goto out; |
| 987 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 988 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
| 989 | set_buffer_new(result); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 990 | map_bh(result, inode->i_sb, blocknr); |
| 991 | |
| 992 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 993 | btrfs_release_path(root, path); |
| 994 | btrfs_free_path(path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 995 | if (trans) |
| 996 | btrfs_end_transaction(trans, root); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 997 | return err; |
| 998 | } |
| 999 | |
| 1000 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
| 1001 | struct buffer_head *result, int create) |
| 1002 | { |
| 1003 | int err; |
| 1004 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 1005 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1006 | err = btrfs_get_block_lock(inode, iblock, result, create); |
| 1007 | // err = btrfs_get_block_inline(inode, iblock, result, create); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1008 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1009 | return err; |
| 1010 | } |
| 1011 | |
| 1012 | static int btrfs_prepare_write(struct file *file, struct page *page, |
| 1013 | unsigned from, unsigned to) |
| 1014 | { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1015 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1016 | } |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1017 | static int btrfs_commit_write(struct file *file, struct page *page, |
| 1018 | unsigned from, unsigned to) |
| 1019 | { |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1020 | return nobh_commit_write(file, page, from, to); |
| 1021 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1022 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1023 | static void btrfs_write_super(struct super_block *sb) |
| 1024 | { |
| 1025 | btrfs_sync_fs(sb, 1); |
| 1026 | } |
| 1027 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1028 | static int btrfs_readpage(struct file *file, struct page *page) |
| 1029 | { |
| 1030 | return mpage_readpage(page, btrfs_get_block); |
| 1031 | } |
| 1032 | |
| 1033 | static int btrfs_readpages(struct file *file, struct address_space *mapping, |
| 1034 | struct list_head *pages, unsigned nr_pages) |
| 1035 | { |
| 1036 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); |
| 1037 | } |
| 1038 | |
| 1039 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 1040 | { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1041 | return nobh_writepage(page, btrfs_get_block, wbc); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1042 | } |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1043 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1044 | static void btrfs_truncate(struct inode *inode) |
| 1045 | { |
| 1046 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 1047 | int ret; |
| 1048 | struct btrfs_trans_handle *trans; |
| 1049 | |
| 1050 | if (!S_ISREG(inode->i_mode)) |
| 1051 | return; |
| 1052 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 1053 | return; |
| 1054 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1055 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1056 | |
| 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); |
| 1061 | BUG_ON(ret); |
| 1062 | ret = btrfs_end_transaction(trans, root); |
| 1063 | BUG_ON(ret); |
| 1064 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1065 | mark_inode_dirty(inode); |
| 1066 | } |
| 1067 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 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) |
| 1071 | { |
| 1072 | long page_fault = 0; |
| 1073 | int i; |
| 1074 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1075 | |
| 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); |
| 1081 | |
| 1082 | /* Copy data from userspace to the current page */ |
| 1083 | kmap(page); |
| 1084 | page_fault = __copy_from_user(page_address(page) + offset, |
| 1085 | buf, count); |
| 1086 | /* Flush processor's dcache for this page */ |
| 1087 | flush_dcache_page(page); |
| 1088 | kunmap(page); |
| 1089 | buf += count; |
| 1090 | write_bytes -= count; |
| 1091 | |
| 1092 | if (page_fault) |
| 1093 | break; |
| 1094 | } |
| 1095 | return page_fault ? -EFAULT : 0; |
| 1096 | } |
| 1097 | |
| 1098 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
| 1099 | { |
| 1100 | size_t i; |
| 1101 | for (i = 0; i < num_pages; i++) { |
| 1102 | if (!pages[i]) |
| 1103 | break; |
| 1104 | unlock_page(pages[i]); |
| 1105 | mark_page_accessed(pages[i]); |
| 1106 | page_cache_release(pages[i]); |
| 1107 | } |
| 1108 | } |
| 1109 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
| 1110 | struct btrfs_root *root, |
| 1111 | struct file *file, |
| 1112 | struct page **pages, |
| 1113 | size_t num_pages, |
| 1114 | loff_t pos, |
| 1115 | size_t write_bytes) |
| 1116 | { |
| 1117 | int i; |
| 1118 | int offset; |
| 1119 | int err = 0; |
| 1120 | int ret; |
| 1121 | int this_write; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1122 | struct inode *inode = file->f_path.dentry->d_inode; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1123 | |
| 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); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1127 | /* FIXME, one block at a time */ |
| 1128 | |
| 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); |
| 1134 | kunmap(pages[i]); |
| 1135 | SetPageChecked(pages[i]); |
| 1136 | ret = btrfs_end_transaction(trans, root); |
| 1137 | BUG_ON(ret); |
| 1138 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1139 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1140 | ret = nobh_commit_write(file, pages[i], offset, |
| 1141 | offset + this_write); |
| 1142 | pos += this_write; |
| 1143 | if (ret) { |
| 1144 | err = ret; |
| 1145 | goto failed; |
| 1146 | } |
| 1147 | WARN_ON(this_write > write_bytes); |
| 1148 | write_bytes -= this_write; |
| 1149 | } |
| 1150 | failed: |
| 1151 | return err; |
| 1152 | } |
| 1153 | |
| 1154 | static int prepare_pages(struct btrfs_trans_handle *trans, |
| 1155 | struct btrfs_root *root, |
| 1156 | struct file *file, |
| 1157 | struct page **pages, |
| 1158 | size_t num_pages, |
| 1159 | loff_t pos, |
| 1160 | size_t write_bytes) |
| 1161 | { |
| 1162 | int i; |
| 1163 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
| 1164 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1165 | int offset; |
| 1166 | int err = 0; |
| 1167 | int ret; |
| 1168 | int this_write; |
| 1169 | loff_t isize = i_size_read(inode); |
| 1170 | |
| 1171 | memset(pages, 0, num_pages * sizeof(struct page *)); |
| 1172 | |
| 1173 | for (i = 0; i < num_pages; i++) { |
| 1174 | pages[i] = grab_cache_page(inode->i_mapping, index + i); |
| 1175 | if (!pages[i]) { |
| 1176 | err = -ENOMEM; |
| 1177 | goto failed_release; |
| 1178 | } |
| 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, |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1183 | btrfs_get_block); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1184 | pos += this_write; |
| 1185 | if (ret) { |
| 1186 | err = ret; |
| 1187 | goto failed_truncate; |
| 1188 | } |
| 1189 | WARN_ON(this_write > write_bytes); |
| 1190 | write_bytes -= this_write; |
| 1191 | } |
| 1192 | return 0; |
| 1193 | |
| 1194 | failed_release: |
| 1195 | btrfs_drop_pages(pages, num_pages); |
| 1196 | return err; |
| 1197 | |
| 1198 | failed_truncate: |
| 1199 | btrfs_drop_pages(pages, num_pages); |
| 1200 | if (pos > isize) |
| 1201 | vmtruncate(inode, isize); |
| 1202 | return err; |
| 1203 | } |
| 1204 | |
| 1205 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, |
| 1206 | size_t count, loff_t *ppos) |
| 1207 | { |
| 1208 | loff_t pos; |
| 1209 | size_t num_written = 0; |
| 1210 | int err = 0; |
| 1211 | int ret = 0; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 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]; |
| 1215 | |
| 1216 | if (file->f_flags & O_DIRECT) |
| 1217 | return -EINVAL; |
| 1218 | pos = *ppos; |
| 1219 | |
| 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)); |
| 1223 | if (err) |
| 1224 | goto out; |
| 1225 | if (count == 0) |
| 1226 | goto out; |
| 1227 | err = remove_suid(file->f_path.dentry); |
| 1228 | if (err) |
| 1229 | goto out; |
| 1230 | file_update_time(file); |
| 1231 | mutex_lock(&inode->i_mutex); |
| 1232 | while(count > 0) { |
| 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) >> |
| 1236 | PAGE_CACHE_SHIFT; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1237 | ret = prepare_pages(NULL, root, file, pages, num_pages, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1238 | pos, write_bytes); |
| 1239 | BUG_ON(ret); |
| 1240 | ret = btrfs_copy_from_user(pos, num_pages, |
| 1241 | write_bytes, pages, buf); |
| 1242 | BUG_ON(ret); |
| 1243 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1244 | ret = dirty_and_release_pages(NULL, root, file, pages, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1245 | num_pages, pos, write_bytes); |
| 1246 | BUG_ON(ret); |
| 1247 | btrfs_drop_pages(pages, num_pages); |
| 1248 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1249 | buf += write_bytes; |
| 1250 | count -= write_bytes; |
| 1251 | pos += write_bytes; |
| 1252 | num_written += write_bytes; |
| 1253 | |
| 1254 | balance_dirty_pages_ratelimited(inode->i_mapping); |
| 1255 | cond_resched(); |
| 1256 | } |
| 1257 | mutex_unlock(&inode->i_mutex); |
| 1258 | out: |
| 1259 | *ppos = pos; |
| 1260 | current->backing_dev_info = NULL; |
| 1261 | return num_written ? num_written : err; |
| 1262 | } |
| 1263 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1264 | #if 0 |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 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) |
| 1268 | { |
| 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; |
| 1274 | int ret; |
| 1275 | size_t copy_size = 0; |
| 1276 | char *dst = NULL; |
| 1277 | int err = 0; |
| 1278 | size_t num_written = 0; |
| 1279 | |
| 1280 | path = btrfs_alloc_path(); |
| 1281 | BUG_ON(!path); |
| 1282 | mutex_lock(&root->fs_info->fs_mutex); |
| 1283 | trans = btrfs_start_transaction(root, 1); |
| 1284 | key.objectid = inode->i_ino; |
| 1285 | key.flags = 0; |
| 1286 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); |
| 1287 | |
| 1288 | again: |
| 1289 | key.offset = pos; |
| 1290 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 1291 | if (ret < 0) { |
| 1292 | err = ret; |
| 1293 | goto out; |
| 1294 | } |
| 1295 | if (ret == 0) { |
| 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); |
| 1302 | goto copyit; |
| 1303 | } else { |
| 1304 | int slot = path->slots[0]; |
| 1305 | if (slot > 0) { |
| 1306 | slot--; |
| 1307 | } |
| 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) |
| 1313 | goto insert; |
| 1314 | if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY) |
| 1315 | goto insert; |
| 1316 | copy_size = btrfs_item_size(leaf->items + slot); |
| 1317 | if (found_key.offset + copy_size <= pos) |
| 1318 | goto insert; |
| 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); |
| 1325 | goto copyit; |
| 1326 | } |
| 1327 | insert: |
| 1328 | btrfs_release_path(root, path); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1329 | copy_size = min(write_bytes, |
| 1330 | (size_t)BTRFS_LEAF_DATA_SIZE(root) - |
| 1331 | sizeof(struct btrfs_item) * 4); |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 1332 | ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size); |
| 1333 | BUG_ON(ret); |
| 1334 | dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 1335 | path->slots[0], char); |
| 1336 | copyit: |
| 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 + |
| 1342 | path->slots[0])); |
| 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); |
| 1347 | pos += copy_size; |
| 1348 | offset += copy_size; |
| 1349 | num_written += copy_size; |
| 1350 | write_bytes -= copy_size; |
| 1351 | if (write_bytes) |
| 1352 | goto again; |
| 1353 | out: |
| 1354 | btrfs_free_path(path); |
| 1355 | ret = btrfs_end_transaction(trans, root); |
| 1356 | BUG_ON(ret); |
| 1357 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1358 | return num_written ? num_written : err; |
| 1359 | } |
| 1360 | |
| 1361 | static ssize_t btrfs_file_inline_write(struct file *file, |
| 1362 | const char __user *buf, |
| 1363 | size_t count, loff_t *ppos) |
| 1364 | { |
| 1365 | loff_t pos; |
| 1366 | size_t num_written = 0; |
| 1367 | int err = 0; |
| 1368 | int ret = 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; |
| 1372 | |
| 1373 | if (file->f_flags & O_DIRECT) |
| 1374 | return -EINVAL; |
| 1375 | pos = *ppos; |
| 1376 | |
| 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)); |
| 1380 | if (err) |
| 1381 | goto out; |
| 1382 | if (count == 0) |
| 1383 | goto out; |
| 1384 | err = remove_suid(file->f_path.dentry); |
| 1385 | if (err) |
| 1386 | goto out; |
| 1387 | file_update_time(file); |
| 1388 | mutex_lock(&inode->i_mutex); |
| 1389 | while(count > 0) { |
| 1390 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1391 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); |
| 1392 | struct page *page; |
| 1393 | |
| 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); |
| 1398 | BUG_ON(ret); |
| 1399 | lock_page(page); |
| 1400 | } |
| 1401 | ret = btrfs_copy_from_user(pos, 1, |
| 1402 | write_bytes, &page, buf); |
| 1403 | BUG_ON(ret); |
| 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); |
| 1410 | } |
| 1411 | page_cache_release(page); |
| 1412 | unlock_page(page); |
| 1413 | if (write_bytes < 0) |
| 1414 | goto out_unlock; |
| 1415 | buf += write_bytes; |
| 1416 | count -= write_bytes; |
| 1417 | pos += write_bytes; |
| 1418 | num_written += write_bytes; |
| 1419 | |
| 1420 | balance_dirty_pages_ratelimited(inode->i_mapping); |
| 1421 | cond_resched(); |
| 1422 | } |
| 1423 | out_unlock: |
| 1424 | mutex_unlock(&inode->i_mutex); |
| 1425 | out: |
| 1426 | *ppos = pos; |
| 1427 | current->backing_dev_info = NULL; |
| 1428 | return num_written ? num_written : err; |
| 1429 | } |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1430 | #endif |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 1431 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1432 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
| 1433 | unsigned long offset, unsigned long size) |
| 1434 | { |
| 1435 | char *kaddr; |
| 1436 | unsigned long left, count = desc->count; |
| 1437 | |
| 1438 | if (size > count) |
| 1439 | size = count; |
| 1440 | |
| 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); |
| 1448 | if (ret) { |
| 1449 | printk("failed to verify ino %lu page %lu\n", |
| 1450 | page->mapping->host->i_ino, |
| 1451 | page->index); |
| 1452 | memset(page_address(page), 0, PAGE_CACHE_SIZE); |
| 1453 | } |
| 1454 | SetPageChecked(page); |
| 1455 | kunmap(page); |
| 1456 | } |
| 1457 | /* |
| 1458 | * Faults on the destination of a read are common, so do it before |
| 1459 | * taking the kmap. |
| 1460 | */ |
| 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); |
| 1466 | if (left == 0) |
| 1467 | goto success; |
| 1468 | } |
| 1469 | |
| 1470 | /* Do it the slow way */ |
| 1471 | kaddr = kmap(page); |
| 1472 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); |
| 1473 | kunmap(page); |
| 1474 | |
| 1475 | if (left) { |
| 1476 | size -= left; |
| 1477 | desc->error = -EFAULT; |
| 1478 | } |
| 1479 | success: |
| 1480 | desc->count = count - size; |
| 1481 | desc->written += size; |
| 1482 | desc->arg.buf += size; |
| 1483 | return size; |
| 1484 | } |
| 1485 | |
| 1486 | /** |
| 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 |
| 1492 | */ |
| 1493 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 1494 | unsigned long nr_segs, loff_t pos) |
| 1495 | { |
| 1496 | struct file *filp = iocb->ki_filp; |
| 1497 | ssize_t retval; |
| 1498 | unsigned long seg; |
| 1499 | size_t count; |
| 1500 | loff_t *ppos = &iocb->ki_pos; |
| 1501 | |
| 1502 | count = 0; |
| 1503 | for (seg = 0; seg < nr_segs; seg++) { |
| 1504 | const struct iovec *iv = &iov[seg]; |
| 1505 | |
| 1506 | /* |
| 1507 | * If any segment has a negative length, or the cumulative |
| 1508 | * length ever wraps negative then return -EINVAL. |
| 1509 | */ |
| 1510 | count += iv->iov_len; |
| 1511 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) |
| 1512 | return -EINVAL; |
| 1513 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) |
| 1514 | continue; |
| 1515 | if (seg == 0) |
| 1516 | return -EFAULT; |
| 1517 | nr_segs = seg; |
| 1518 | count -= iv->iov_len; /* This segment is no good */ |
| 1519 | break; |
| 1520 | } |
| 1521 | retval = 0; |
| 1522 | if (count) { |
| 1523 | for (seg = 0; seg < nr_segs; seg++) { |
| 1524 | read_descriptor_t desc; |
| 1525 | |
| 1526 | desc.written = 0; |
| 1527 | desc.arg.buf = iov[seg].iov_base; |
| 1528 | desc.count = iov[seg].iov_len; |
| 1529 | if (desc.count == 0) |
| 1530 | continue; |
| 1531 | desc.error = 0; |
| 1532 | do_generic_file_read(filp, ppos, &desc, |
| 1533 | btrfs_read_actor); |
| 1534 | retval += desc.written; |
| 1535 | if (desc.error) { |
| 1536 | retval = retval ?: desc.error; |
| 1537 | break; |
| 1538 | } |
| 1539 | } |
| 1540 | } |
| 1541 | return retval; |
| 1542 | } |
| 1543 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 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; |
| 1549 | |
| 1550 | /* |
| 1551 | * Called inside transaction, so use GFP_NOFS |
| 1552 | */ |
| 1553 | static struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 1554 | { |
| 1555 | struct btrfs_inode *ei; |
| 1556 | |
| 1557 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 1558 | if (!ei) |
| 1559 | return NULL; |
| 1560 | ei->magic = 0xDEADBEEF; |
| 1561 | ei->magic2 = 0xDEADBEAF; |
| 1562 | return &ei->vfs_inode; |
| 1563 | } |
| 1564 | |
| 1565 | static void btrfs_destroy_inode(struct inode *inode) |
| 1566 | { |
| 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)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1571 | WARN_ON(inode->i_data.nrpages); |
| 1572 | |
| 1573 | ei->magic = 0; |
| 1574 | ei->magic2 = 0; |
| 1575 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 1576 | } |
| 1577 | |
| 1578 | static void init_once(void * foo, struct kmem_cache * cachep, |
| 1579 | unsigned long flags) |
| 1580 | { |
| 1581 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 1582 | |
| 1583 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 1584 | SLAB_CTOR_CONSTRUCTOR) { |
| 1585 | inode_init_once(&ei->vfs_inode); |
| 1586 | } |
| 1587 | } |
| 1588 | |
| 1589 | static int init_inodecache(void) |
| 1590 | { |
| 1591 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 1592 | sizeof(struct btrfs_inode), |
| 1593 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1594 | SLAB_MEM_SPREAD), |
| 1595 | init_once, NULL); |
| 1596 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 1597 | sizeof(struct btrfs_trans_handle), |
| 1598 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1599 | SLAB_MEM_SPREAD), |
| 1600 | NULL, NULL); |
| 1601 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 1602 | sizeof(struct btrfs_transaction), |
| 1603 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1604 | SLAB_MEM_SPREAD), |
| 1605 | NULL, NULL); |
| 1606 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 1607 | sizeof(struct btrfs_transaction), |
| 1608 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1609 | SLAB_MEM_SPREAD), |
| 1610 | NULL, NULL); |
| 1611 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", |
| 1612 | 256, |
| 1613 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1614 | SLAB_MEM_SPREAD | |
| 1615 | SLAB_DESTROY_BY_RCU), |
| 1616 | NULL, NULL); |
| 1617 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || |
| 1618 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) |
| 1619 | return -ENOMEM; |
| 1620 | return 0; |
| 1621 | } |
| 1622 | |
| 1623 | static void destroy_inodecache(void) |
| 1624 | { |
| 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); |
| 1630 | } |
| 1631 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1632 | static int btrfs_get_sb(struct file_system_type *fs_type, |
| 1633 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| 1634 | { |
| 1635 | return get_sb_bdev(fs_type, flags, dev_name, data, |
| 1636 | btrfs_fill_super, mnt); |
| 1637 | } |
| 1638 | |
| 1639 | static struct file_system_type btrfs_fs_type = { |
| 1640 | .owner = THIS_MODULE, |
| 1641 | .name = "btrfs", |
| 1642 | .get_sb = btrfs_get_sb, |
| 1643 | .kill_sb = kill_block_super, |
| 1644 | .fs_flags = FS_REQUIRES_DEV, |
| 1645 | }; |
| 1646 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1647 | static struct super_operations btrfs_super_ops = { |
| 1648 | .statfs = simple_statfs, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 1649 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1650 | .put_super = btrfs_put_super, |
| 1651 | .read_inode = btrfs_read_locked_inode, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1652 | .write_super = btrfs_write_super, |
| 1653 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1654 | .write_inode = btrfs_write_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1655 | .alloc_inode = btrfs_alloc_inode, |
| 1656 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1657 | }; |
| 1658 | |
| 1659 | static struct inode_operations btrfs_dir_inode_operations = { |
| 1660 | .lookup = btrfs_lookup, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1661 | .create = btrfs_create, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 1662 | .unlink = btrfs_unlink, |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1663 | .mkdir = btrfs_mkdir, |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 1664 | .rmdir = btrfs_rmdir, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1665 | }; |
| 1666 | |
| 1667 | static struct file_operations btrfs_dir_file_operations = { |
| 1668 | .llseek = generic_file_llseek, |
| 1669 | .read = generic_read_dir, |
| 1670 | .readdir = btrfs_readdir, |
| 1671 | }; |
| 1672 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1673 | static struct address_space_operations btrfs_aops = { |
| 1674 | .readpage = btrfs_readpage, |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1675 | .readpages = btrfs_readpages, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1676 | .writepage = btrfs_writepage, |
| 1677 | .sync_page = block_sync_page, |
| 1678 | .prepare_write = btrfs_prepare_write, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1679 | .commit_write = btrfs_commit_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1680 | }; |
| 1681 | |
| 1682 | static struct inode_operations btrfs_file_inode_operations = { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1683 | .truncate = btrfs_truncate, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1684 | }; |
| 1685 | |
| 1686 | static struct file_operations btrfs_file_operations = { |
| 1687 | .llseek = generic_file_llseek, |
| 1688 | .read = do_sync_read, |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1689 | .aio_read = btrfs_file_aio_read, |
| 1690 | .write = btrfs_file_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1691 | .mmap = generic_file_mmap, |
| 1692 | .open = generic_file_open, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1693 | }; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1694 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1695 | static int __init init_btrfs_fs(void) |
| 1696 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1697 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1698 | printk("btrfs loaded!\n"); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1699 | err = init_inodecache(); |
| 1700 | if (err) |
| 1701 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1702 | return register_filesystem(&btrfs_fs_type); |
| 1703 | } |
| 1704 | |
| 1705 | static void __exit exit_btrfs_fs(void) |
| 1706 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1707 | destroy_inodecache(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1708 | unregister_filesystem(&btrfs_fs_type); |
| 1709 | printk("btrfs unloaded\n"); |
| 1710 | } |
| 1711 | |
| 1712 | module_init(init_btrfs_fs) |
| 1713 | module_exit(exit_btrfs_fs) |
| 1714 | |
| 1715 | MODULE_LICENSE("GPL"); |