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); |
| 135 | dentry->d_inode->i_ctime = dir->i_ctime; |
| 136 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 137 | btrfs_release_path(root, path); |
| 138 | btrfs_free_path(path); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 139 | if (ret == 0) { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 140 | inode_dec_link_count(dentry->d_inode); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 141 | dir->i_size -= name_len; |
| 142 | mark_inode_dirty(dir); |
| 143 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 144 | return ret; |
| 145 | } |
| 146 | |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 147 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 148 | { |
| 149 | struct btrfs_root *root; |
| 150 | struct btrfs_trans_handle *trans; |
| 151 | int ret; |
| 152 | |
| 153 | root = btrfs_sb(dir->i_sb); |
| 154 | mutex_lock(&root->fs_info->fs_mutex); |
| 155 | trans = btrfs_start_transaction(root, 1); |
| 156 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
| 157 | btrfs_end_transaction(trans, root); |
| 158 | mutex_unlock(&root->fs_info->fs_mutex); |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 163 | { |
| 164 | struct inode *inode = dentry->d_inode; |
| 165 | int err; |
| 166 | int ret; |
| 167 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 168 | struct btrfs_path *path; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 169 | struct btrfs_key key; |
| 170 | struct btrfs_trans_handle *trans; |
| 171 | struct btrfs_disk_key *found_key; |
| 172 | struct btrfs_leaf *leaf; |
| 173 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 174 | path = btrfs_alloc_path(); |
| 175 | BUG_ON(!path); |
| 176 | btrfs_init_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 177 | mutex_lock(&root->fs_info->fs_mutex); |
| 178 | trans = btrfs_start_transaction(root, 1); |
| 179 | key.objectid = inode->i_ino; |
| 180 | key.offset = (u64)-1; |
| 181 | key.flags = 0; |
| 182 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 183 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 184 | if (ret < 0) { |
| 185 | err = ret; |
| 186 | goto out; |
| 187 | } |
| 188 | |
| 189 | BUG_ON(ret == 0); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 190 | BUG_ON(path->slots[0] == 0); |
| 191 | path->slots[0]--; |
| 192 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 193 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 194 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) { |
| 195 | err = -ENOENT; |
| 196 | goto out; |
| 197 | } |
| 198 | if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY || |
| 199 | btrfs_disk_key_offset(found_key) != 2) { |
| 200 | err = -ENOTEMPTY; |
| 201 | goto out; |
| 202 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 203 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 204 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 205 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 206 | key.offset = 1; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 207 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 208 | if (ret < 0) { |
| 209 | err = ret; |
| 210 | goto out; |
| 211 | } |
| 212 | if (ret > 0) { |
| 213 | err = -ENOTEMPTY; |
| 214 | goto out; |
| 215 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 216 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 217 | if (ret) { |
| 218 | err = ret; |
| 219 | goto out; |
| 220 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 221 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 222 | |
| 223 | /* now the directory is empty */ |
| 224 | err = btrfs_unlink_trans(trans, root, dir, dentry); |
| 225 | if (!err) { |
| 226 | inode->i_size = 0; |
| 227 | } |
| 228 | out: |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 229 | btrfs_release_path(root, path); |
| 230 | btrfs_free_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 231 | mutex_unlock(&root->fs_info->fs_mutex); |
| 232 | ret = btrfs_end_transaction(trans, root); |
| 233 | if (ret && !err) |
| 234 | err = ret; |
| 235 | return err; |
| 236 | } |
| 237 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 238 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
| 239 | struct btrfs_root *root, |
| 240 | struct inode *inode) |
| 241 | { |
| 242 | u64 objectid = inode->i_ino; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 243 | struct btrfs_path *path; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 244 | struct btrfs_inode_map_item *map; |
| 245 | struct btrfs_key stat_data_key; |
| 246 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 247 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 248 | clear_inode(inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 249 | |
| 250 | path = btrfs_alloc_path(); |
| 251 | BUG_ON(!path); |
| 252 | btrfs_init_path(path); |
| 253 | ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 254 | if (ret) { |
| 255 | if (ret > 0) |
| 256 | ret = -ENOENT; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 257 | goto error; |
| 258 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 259 | 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] | 260 | struct btrfs_inode_map_item); |
| 261 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 262 | ret = btrfs_del_item(trans, root->fs_info->inode_root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 263 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 264 | btrfs_release_path(root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 265 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 266 | ret = btrfs_lookup_inode(trans, root, path, objectid, -1); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 267 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 268 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 269 | BUG_ON(ret); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 270 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 271 | btrfs_release_path(root, path); |
| 272 | btrfs_free_path(path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 273 | return ret; |
| 274 | } |
| 275 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 276 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
| 277 | struct btrfs_root *root, |
| 278 | struct inode *inode) |
| 279 | { |
| 280 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 281 | struct btrfs_path *path; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 282 | struct btrfs_key key; |
| 283 | struct btrfs_disk_key *found_key; |
| 284 | struct btrfs_leaf *leaf; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 285 | struct btrfs_file_extent_item *fi = NULL; |
| 286 | u64 extent_start = 0; |
| 287 | u64 extent_num_blocks = 0; |
| 288 | int found_extent; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 289 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 290 | path = btrfs_alloc_path(); |
| 291 | BUG_ON(!path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 292 | /* FIXME, add redo link to tree so we don't leak on crash */ |
| 293 | key.objectid = inode->i_ino; |
| 294 | key.offset = (u64)-1; |
| 295 | key.flags = 0; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 296 | /* |
| 297 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys |
| 298 | * or extent data |
| 299 | */ |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 300 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 301 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 302 | btrfs_init_path(path); |
| 303 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 304 | if (ret < 0) { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 305 | goto error; |
| 306 | } |
| 307 | if (ret > 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 308 | BUG_ON(path->slots[0] == 0); |
| 309 | path->slots[0]--; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 310 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 311 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 312 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 313 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
| 314 | break; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 315 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 316 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 317 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 318 | break; |
| 319 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
| 320 | break; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 321 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 322 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 323 | path->slots[0], |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 324 | struct btrfs_file_extent_item); |
| 325 | extent_start = btrfs_file_extent_disk_blocknr(fi); |
| 326 | extent_num_blocks = |
| 327 | btrfs_file_extent_disk_num_blocks(fi); |
| 328 | inode->i_blocks -= |
| 329 | btrfs_file_extent_num_blocks(fi) >> 9; |
| 330 | found_extent = 1; |
| 331 | } else { |
| 332 | found_extent = 0; |
| 333 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 334 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 335 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 336 | btrfs_release_path(root, path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 337 | if (found_extent) { |
| 338 | ret = btrfs_free_extent(trans, root, extent_start, |
| 339 | extent_num_blocks, 0); |
| 340 | BUG_ON(ret); |
| 341 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 342 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 343 | ret = 0; |
| 344 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 345 | btrfs_release_path(root, path); |
| 346 | btrfs_free_path(path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 347 | return ret; |
| 348 | } |
| 349 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 350 | static void btrfs_delete_inode(struct inode *inode) |
| 351 | { |
| 352 | struct btrfs_trans_handle *trans; |
| 353 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 354 | int ret; |
| 355 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 356 | truncate_inode_pages(&inode->i_data, 0); |
| 357 | if (is_bad_inode(inode)) { |
| 358 | goto no_delete; |
| 359 | } |
| 360 | inode->i_size = 0; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 361 | mutex_lock(&root->fs_info->fs_mutex); |
| 362 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 363 | if (S_ISREG(inode->i_mode)) { |
| 364 | ret = btrfs_truncate_in_trans(trans, root, inode); |
| 365 | BUG_ON(ret); |
| 366 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 367 | btrfs_free_inode(trans, root, inode); |
| 368 | btrfs_end_transaction(trans, root); |
| 369 | mutex_unlock(&root->fs_info->fs_mutex); |
| 370 | return; |
| 371 | no_delete: |
| 372 | clear_inode(inode); |
| 373 | } |
| 374 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 375 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
| 376 | ino_t *ino) |
| 377 | { |
| 378 | const char *name = dentry->d_name.name; |
| 379 | int namelen = dentry->d_name.len; |
| 380 | struct btrfs_dir_item *di; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 381 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 382 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 383 | int ret; |
| 384 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 385 | path = btrfs_alloc_path(); |
| 386 | BUG_ON(!path); |
| 387 | btrfs_init_path(path); |
| 388 | ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 389 | namelen, 0); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 390 | if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 391 | *ino = 0; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 392 | ret = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 393 | goto out; |
| 394 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 395 | 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] | 396 | struct btrfs_dir_item); |
| 397 | *ino = btrfs_dir_objectid(di); |
| 398 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 399 | btrfs_release_path(root, path); |
| 400 | btrfs_free_path(path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 401 | check_inode(dir); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 402 | return ret; |
| 403 | } |
| 404 | |
| 405 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
| 406 | struct nameidata *nd) |
| 407 | { |
| 408 | struct inode * inode; |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 409 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 410 | ino_t ino; |
| 411 | int ret; |
| 412 | |
| 413 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 414 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 415 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 416 | ret = btrfs_inode_by_name(dir, dentry, &ino); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 417 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 418 | if (ret < 0) |
| 419 | return ERR_PTR(ret); |
| 420 | inode = NULL; |
| 421 | if (ino) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 422 | inode = iget(dir->i_sb, ino); |
| 423 | if (!inode) |
| 424 | return ERR_PTR(-EACCES); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 425 | check_inode(inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 426 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 427 | check_inode(dir); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 428 | return d_splice_alias(inode, dentry); |
| 429 | } |
| 430 | |
| 431 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 432 | { |
| 433 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 434 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 435 | struct btrfs_item *item; |
| 436 | struct btrfs_dir_item *di; |
| 437 | struct btrfs_key key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 438 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 439 | int ret; |
| 440 | u32 nritems; |
| 441 | struct btrfs_leaf *leaf; |
| 442 | int slot; |
| 443 | int advance; |
| 444 | unsigned char d_type = DT_UNKNOWN; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 445 | int over = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 446 | |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 447 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 448 | key.objectid = inode->i_ino; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 449 | key.flags = 0; |
Chris Mason | bae45de | 2007-04-04 21:22:22 -0400 | [diff] [blame^] | 450 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 451 | key.offset = filp->f_pos; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 452 | path = btrfs_alloc_path(); |
| 453 | btrfs_init_path(path); |
| 454 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 455 | if (ret < 0) { |
| 456 | goto err; |
| 457 | } |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 458 | advance = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 459 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 460 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 461 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 462 | slot = path->slots[0]; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 463 | if (advance || slot >= nritems) { |
| 464 | if (slot >= nritems -1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 465 | ret = btrfs_next_leaf(root, path); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 466 | if (ret) |
| 467 | break; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 468 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 469 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 470 | slot = path->slots[0]; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 471 | } else { |
| 472 | slot++; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 473 | path->slots[0]++; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 474 | } |
| 475 | } |
| 476 | advance = 1; |
| 477 | item = leaf->items + slot; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 478 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
| 479 | break; |
Chris Mason | bae45de | 2007-04-04 21:22:22 -0400 | [diff] [blame^] | 480 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 481 | continue; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 482 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
| 483 | continue; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 484 | |
| 485 | advance = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 486 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 487 | over = filldir(dirent, (const char *)(di + 1), |
| 488 | btrfs_dir_name_len(di), |
| 489 | btrfs_disk_key_offset(&item->key), |
| 490 | btrfs_dir_objectid(di), d_type); |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 491 | if (over) { |
| 492 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 493 | break; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 494 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 495 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
| 496 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 497 | ret = 0; |
| 498 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 499 | btrfs_release_path(root, path); |
| 500 | btrfs_free_path(path); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 501 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | static void btrfs_put_super (struct super_block * sb) |
| 506 | { |
| 507 | struct btrfs_root *root = btrfs_sb(sb); |
| 508 | int ret; |
| 509 | |
| 510 | ret = close_ctree(root); |
| 511 | if (ret) { |
| 512 | printk("close ctree returns %d\n", ret); |
| 513 | } |
| 514 | sb->s_fs_info = NULL; |
| 515 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 516 | |
| 517 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
| 518 | { |
| 519 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 520 | struct dentry * root_dentry; |
| 521 | struct btrfs_super_block *disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 522 | struct btrfs_root *root; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 523 | |
| 524 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 525 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 526 | sb->s_op = &btrfs_super_ops; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 527 | sb->s_time_gran = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 528 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 529 | root = open_ctree(sb); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 530 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 531 | if (!root) { |
| 532 | printk("btrfs: open_ctree failed\n"); |
| 533 | return -EIO; |
| 534 | } |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 535 | sb->s_fs_info = root; |
| 536 | disk_super = root->fs_info->disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 537 | printk("read in super total blocks %Lu root %Lu\n", |
| 538 | btrfs_super_total_blocks(disk_super), |
| 539 | btrfs_super_root_dir(disk_super)); |
| 540 | |
| 541 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 542 | if (!inode) |
| 543 | return -ENOMEM; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 544 | if (inode->i_state & I_NEW) { |
| 545 | btrfs_read_locked_inode(inode); |
| 546 | unlock_new_inode(inode); |
| 547 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 548 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 549 | root_dentry = d_alloc_root(inode); |
| 550 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 551 | iput(inode); |
| 552 | return -ENOMEM; |
| 553 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 554 | sb->s_root = root_dentry; |
| 555 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 556 | return 0; |
| 557 | } |
| 558 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 559 | static void fill_inode_item(struct btrfs_inode_item *item, |
| 560 | struct inode *inode) |
| 561 | { |
| 562 | btrfs_set_inode_uid(item, inode->i_uid); |
| 563 | btrfs_set_inode_gid(item, inode->i_gid); |
| 564 | btrfs_set_inode_size(item, inode->i_size); |
| 565 | btrfs_set_inode_mode(item, inode->i_mode); |
| 566 | btrfs_set_inode_nlink(item, inode->i_nlink); |
| 567 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); |
| 568 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); |
| 569 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); |
| 570 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); |
| 571 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); |
| 572 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); |
| 573 | btrfs_set_inode_nblocks(item, inode->i_blocks); |
| 574 | btrfs_set_inode_generation(item, inode->i_generation); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 575 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 576 | } |
| 577 | |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 578 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 579 | struct btrfs_root *root, |
| 580 | struct inode *inode) |
| 581 | { |
| 582 | struct btrfs_inode_item *inode_item; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 583 | struct btrfs_path *path; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 584 | int ret; |
| 585 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 586 | path = btrfs_alloc_path(); |
| 587 | BUG_ON(!path); |
| 588 | btrfs_init_path(path); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 589 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 590 | ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 591 | if (ret) { |
| 592 | if (ret > 0) |
| 593 | ret = -ENOENT; |
| 594 | goto failed; |
| 595 | } |
| 596 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 597 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 598 | path->slots[0], |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 599 | struct btrfs_inode_item); |
| 600 | |
| 601 | fill_inode_item(inode_item, inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 602 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 603 | failed: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 604 | btrfs_release_path(root, path); |
| 605 | btrfs_free_path(path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 606 | check_inode(inode); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | static int btrfs_write_inode(struct inode *inode, int wait) |
| 611 | { |
| 612 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 613 | struct btrfs_trans_handle *trans; |
| 614 | int ret; |
| 615 | |
| 616 | mutex_lock(&root->fs_info->fs_mutex); |
| 617 | trans = btrfs_start_transaction(root, 1); |
| 618 | ret = btrfs_update_inode(trans, root, inode); |
| 619 | if (wait) |
| 620 | btrfs_commit_transaction(trans, root); |
| 621 | else |
| 622 | btrfs_end_transaction(trans, root); |
| 623 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 624 | check_inode(inode); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 625 | return ret; |
| 626 | } |
| 627 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 628 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
| 629 | struct inode *dir, int mode) |
| 630 | { |
| 631 | struct inode *inode; |
| 632 | struct btrfs_inode_item inode_item; |
| 633 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 634 | struct btrfs_key key; |
| 635 | int ret; |
| 636 | u64 objectid; |
| 637 | |
| 638 | inode = new_inode(dir->i_sb); |
| 639 | if (!inode) |
| 640 | return ERR_PTR(-ENOMEM); |
| 641 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 642 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 643 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 644 | BUG_ON(ret); |
| 645 | |
| 646 | inode->i_uid = current->fsuid; |
| 647 | inode->i_gid = current->fsgid; |
| 648 | inode->i_mode = mode; |
| 649 | inode->i_ino = objectid; |
| 650 | inode->i_blocks = 0; |
| 651 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
| 652 | fill_inode_item(&inode_item, inode); |
| 653 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 654 | key.objectid = objectid; |
| 655 | key.flags = 0; |
| 656 | key.offset = 0; |
| 657 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 658 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); |
| 659 | BUG_ON(ret); |
| 660 | |
| 661 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); |
| 662 | BUG_ON(ret); |
| 663 | |
| 664 | insert_inode_hash(inode); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 665 | check_inode(inode); |
| 666 | check_inode(dir); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 667 | return inode; |
| 668 | } |
| 669 | |
| 670 | static int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 671 | struct dentry *dentry, struct inode *inode) |
| 672 | { |
| 673 | int ret; |
| 674 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), |
| 675 | dentry->d_name.name, dentry->d_name.len, |
| 676 | dentry->d_parent->d_inode->i_ino, |
| 677 | inode->i_ino, 0); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 678 | if (ret == 0) { |
| 679 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; |
| 680 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), |
| 681 | dentry->d_parent->d_inode); |
| 682 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 683 | check_inode(inode); |
| 684 | check_inode(dentry->d_parent->d_inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 685 | return ret; |
| 686 | } |
| 687 | |
| 688 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
| 689 | struct dentry *dentry, struct inode *inode) |
| 690 | { |
| 691 | int err = btrfs_add_link(trans, dentry, inode); |
| 692 | if (!err) { |
| 693 | d_instantiate(dentry, inode); |
| 694 | return 0; |
| 695 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 696 | if (err > 0) |
| 697 | err = -EEXIST; |
| 698 | check_inode(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 699 | return err; |
| 700 | } |
| 701 | |
| 702 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
| 703 | int mode, struct nameidata *nd) |
| 704 | { |
| 705 | struct btrfs_trans_handle *trans; |
| 706 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 707 | struct inode *inode; |
| 708 | int err; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 709 | int drop_inode = 0; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 710 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 711 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 712 | trans = btrfs_start_transaction(root, 1); |
| 713 | inode = btrfs_new_inode(trans, dir, mode); |
| 714 | err = PTR_ERR(inode); |
| 715 | if (IS_ERR(inode)) |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 716 | goto out_unlock; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 717 | // FIXME mark the inode dirty |
| 718 | err = btrfs_add_nondir(trans, dentry, inode); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 719 | if (err) |
| 720 | drop_inode = 1; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 721 | else { |
| 722 | inode->i_mapping->a_ops = &btrfs_aops; |
| 723 | inode->i_fop = &btrfs_file_operations; |
| 724 | inode->i_op = &btrfs_file_inode_operations; |
| 725 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 726 | dir->i_sb->s_dirt = 1; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 727 | out_unlock: |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 728 | btrfs_end_transaction(trans, root); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 729 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 730 | check_inode(inode); |
| 731 | check_inode(dir); |
| 732 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 733 | if (drop_inode) { |
| 734 | inode_dec_link_count(inode); |
| 735 | iput(inode); |
| 736 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 737 | return err; |
| 738 | } |
| 739 | |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 740 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
| 741 | struct inode *inode, struct inode *dir) |
| 742 | { |
| 743 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 744 | int ret; |
| 745 | char buf[2]; |
| 746 | buf[0] = '.'; |
| 747 | buf[1] = '.'; |
| 748 | |
| 749 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, |
| 750 | inode->i_ino, 1); |
| 751 | if (ret) |
| 752 | goto error; |
| 753 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, |
| 754 | dir->i_ino, 1); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 755 | if (ret) |
| 756 | goto error; |
| 757 | inode->i_size = 3; |
| 758 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 759 | error: |
| 760 | return ret; |
| 761 | } |
| 762 | |
| 763 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 764 | { |
| 765 | struct inode *inode; |
| 766 | struct btrfs_trans_handle *trans; |
| 767 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
| 768 | int err = 0; |
| 769 | int drop_on_err = 0; |
| 770 | |
| 771 | mutex_lock(&root->fs_info->fs_mutex); |
| 772 | trans = btrfs_start_transaction(root, 1); |
| 773 | if (IS_ERR(trans)) { |
| 774 | err = PTR_ERR(trans); |
| 775 | goto out_unlock; |
| 776 | } |
| 777 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); |
| 778 | if (IS_ERR(inode)) { |
| 779 | err = PTR_ERR(inode); |
| 780 | goto out_fail; |
| 781 | } |
| 782 | drop_on_err = 1; |
| 783 | inode->i_op = &btrfs_dir_inode_operations; |
| 784 | inode->i_fop = &btrfs_dir_file_operations; |
| 785 | |
| 786 | err = btrfs_make_empty_dir(trans, inode, dir); |
| 787 | if (err) |
| 788 | goto out_fail; |
| 789 | err = btrfs_add_link(trans, dentry, inode); |
| 790 | if (err) |
| 791 | goto out_fail; |
| 792 | d_instantiate(dentry, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 793 | drop_on_err = 0; |
| 794 | |
| 795 | out_fail: |
| 796 | btrfs_end_transaction(trans, root); |
| 797 | out_unlock: |
| 798 | mutex_unlock(&root->fs_info->fs_mutex); |
| 799 | if (drop_on_err) |
| 800 | iput(inode); |
| 801 | return err; |
| 802 | } |
| 803 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 804 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
| 805 | { |
| 806 | struct btrfs_trans_handle *trans; |
| 807 | struct btrfs_root *root; |
| 808 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 809 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 810 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 811 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 812 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 813 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 814 | return 0; |
| 815 | } |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 816 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 817 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 818 | trans = btrfs_start_transaction(root, 1); |
| 819 | ret = btrfs_commit_transaction(trans, root); |
| 820 | sb->s_dirt = 0; |
| 821 | BUG_ON(ret); |
| 822 | printk("btrfs sync_fs\n"); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 823 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 824 | return 0; |
| 825 | } |
| 826 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 827 | #if 0 |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 828 | static int btrfs_get_block_inline(struct inode *inode, sector_t iblock, |
| 829 | struct buffer_head *result, int create) |
| 830 | { |
| 831 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 832 | struct btrfs_path *path; |
| 833 | struct btrfs_key key; |
| 834 | struct btrfs_leaf *leaf; |
| 835 | int num_bytes = result->b_size; |
| 836 | int item_size; |
| 837 | int ret; |
| 838 | u64 pos; |
| 839 | char *ptr; |
| 840 | int copy_size; |
| 841 | int err = 0; |
| 842 | char *safe_ptr; |
| 843 | char *data_ptr; |
| 844 | |
| 845 | path = btrfs_alloc_path(); |
| 846 | BUG_ON(!path); |
| 847 | |
| 848 | WARN_ON(create); |
| 849 | if (create) { |
| 850 | return 0; |
| 851 | } |
| 852 | pos = iblock << inode->i_blkbits; |
| 853 | key.objectid = inode->i_ino; |
| 854 | key.flags = 0; |
| 855 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); |
| 856 | ptr = kmap(result->b_page); |
| 857 | safe_ptr = ptr; |
| 858 | ptr += (pos & (PAGE_CACHE_SIZE -1)); |
| 859 | again: |
| 860 | key.offset = pos; |
| 861 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 862 | if (ret) { |
| 863 | if (ret < 0) |
| 864 | err = ret; |
| 865 | else |
| 866 | err = 0; |
| 867 | goto out; |
| 868 | } |
| 869 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 870 | item_size = btrfs_item_size(leaf->items + path->slots[0]); |
| 871 | copy_size = min(num_bytes, item_size); |
| 872 | data_ptr = btrfs_item_ptr(leaf, path->slots[0], char); |
| 873 | WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size); |
| 874 | memcpy(ptr, data_ptr, copy_size); |
| 875 | pos += copy_size; |
| 876 | num_bytes -= copy_size; |
| 877 | WARN_ON(num_bytes < 0); |
| 878 | ptr += copy_size; |
| 879 | btrfs_release_path(root, path); |
| 880 | if (num_bytes != 0) { |
| 881 | if (pos >= i_size_read(inode)) |
| 882 | memset(ptr, 0, num_bytes); |
| 883 | else |
| 884 | goto again; |
| 885 | } |
| 886 | set_buffer_uptodate(result); |
| 887 | map_bh(result, inode->i_sb, 0); |
| 888 | err = 0; |
| 889 | out: |
| 890 | btrfs_free_path(path); |
| 891 | kunmap(result->b_page); |
| 892 | return err; |
| 893 | } |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 894 | #endif |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 895 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 896 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 897 | struct buffer_head *result, int create) |
| 898 | { |
| 899 | int ret; |
| 900 | int err = 0; |
| 901 | u64 blocknr; |
| 902 | u64 extent_start = 0; |
| 903 | u64 extent_end = 0; |
| 904 | u64 objectid = inode->i_ino; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 905 | struct btrfs_path *path; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 906 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 907 | struct btrfs_trans_handle *trans = NULL; |
| 908 | struct btrfs_file_extent_item *item; |
| 909 | struct btrfs_leaf *leaf; |
| 910 | struct btrfs_disk_key *found_key; |
| 911 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 912 | path = btrfs_alloc_path(); |
| 913 | BUG_ON(!path); |
| 914 | btrfs_init_path(path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 915 | if (create) |
| 916 | trans = btrfs_start_transaction(root, 1); |
| 917 | |
| 918 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 919 | ret = btrfs_lookup_file_extent(trans, root, path, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 920 | inode->i_ino, |
| 921 | iblock << inode->i_blkbits, 0); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 922 | if (ret < 0) { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 923 | err = ret; |
| 924 | goto out; |
| 925 | } |
| 926 | |
| 927 | if (ret != 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 928 | if (path->slots[0] == 0) { |
| 929 | btrfs_release_path(root, path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 930 | goto allocate; |
| 931 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 932 | path->slots[0]--; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 933 | } |
| 934 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 935 | 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] | 936 | struct btrfs_file_extent_item); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 937 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 938 | blocknr = btrfs_file_extent_disk_blocknr(item); |
| 939 | blocknr += btrfs_file_extent_offset(item); |
| 940 | |
| 941 | /* exact match found, use it */ |
| 942 | if (ret == 0) { |
| 943 | err = 0; |
| 944 | map_bh(result, inode->i_sb, blocknr); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 945 | goto out; |
| 946 | } |
| 947 | |
| 948 | /* are we inside the extent that was found? */ |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 949 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 950 | if (btrfs_disk_key_objectid(found_key) != objectid || |
| 951 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { |
| 952 | extent_end = 0; |
| 953 | extent_start = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 954 | btrfs_release_path(root, path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 955 | goto allocate; |
| 956 | } |
| 957 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 958 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 959 | extent_start = extent_start >> inode->i_blkbits; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 960 | extent_start += btrfs_file_extent_offset(item); |
| 961 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 962 | if (iblock >= extent_start && iblock < extent_end) { |
| 963 | err = 0; |
| 964 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); |
| 965 | goto out; |
| 966 | } |
| 967 | allocate: |
| 968 | /* ok, create a new extent */ |
| 969 | if (!create) { |
| 970 | err = 0; |
| 971 | goto out; |
| 972 | } |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 973 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
| 974 | iblock << inode->i_blkbits, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 975 | 1, extent_end, &blocknr); |
| 976 | if (ret) { |
| 977 | err = ret; |
| 978 | goto out; |
| 979 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 980 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
| 981 | set_buffer_new(result); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 982 | map_bh(result, inode->i_sb, blocknr); |
| 983 | |
| 984 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 985 | btrfs_release_path(root, path); |
| 986 | btrfs_free_path(path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 987 | if (trans) |
| 988 | btrfs_end_transaction(trans, root); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 989 | return err; |
| 990 | } |
| 991 | |
| 992 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
| 993 | struct buffer_head *result, int create) |
| 994 | { |
| 995 | int err; |
| 996 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 997 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 998 | err = btrfs_get_block_lock(inode, iblock, result, create); |
| 999 | // err = btrfs_get_block_inline(inode, iblock, result, create); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1000 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1001 | return err; |
| 1002 | } |
| 1003 | |
| 1004 | static int btrfs_prepare_write(struct file *file, struct page *page, |
| 1005 | unsigned from, unsigned to) |
| 1006 | { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1007 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1008 | } |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1009 | static int btrfs_commit_write(struct file *file, struct page *page, |
| 1010 | unsigned from, unsigned to) |
| 1011 | { |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1012 | return nobh_commit_write(file, page, from, to); |
| 1013 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1014 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1015 | static void btrfs_write_super(struct super_block *sb) |
| 1016 | { |
| 1017 | btrfs_sync_fs(sb, 1); |
| 1018 | } |
| 1019 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1020 | static int btrfs_readpage(struct file *file, struct page *page) |
| 1021 | { |
| 1022 | return mpage_readpage(page, btrfs_get_block); |
| 1023 | } |
| 1024 | |
| 1025 | static int btrfs_readpages(struct file *file, struct address_space *mapping, |
| 1026 | struct list_head *pages, unsigned nr_pages) |
| 1027 | { |
| 1028 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); |
| 1029 | } |
| 1030 | |
| 1031 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 1032 | { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1033 | return nobh_writepage(page, btrfs_get_block, wbc); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1034 | } |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1035 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1036 | static void btrfs_truncate(struct inode *inode) |
| 1037 | { |
| 1038 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 1039 | int ret; |
| 1040 | struct btrfs_trans_handle *trans; |
| 1041 | |
| 1042 | if (!S_ISREG(inode->i_mode)) |
| 1043 | return; |
| 1044 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 1045 | return; |
| 1046 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1047 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1048 | |
| 1049 | /* FIXME, add redo link to tree so we don't leak on crash */ |
| 1050 | mutex_lock(&root->fs_info->fs_mutex); |
| 1051 | trans = btrfs_start_transaction(root, 1); |
| 1052 | ret = btrfs_truncate_in_trans(trans, root, inode); |
| 1053 | BUG_ON(ret); |
| 1054 | ret = btrfs_end_transaction(trans, root); |
| 1055 | BUG_ON(ret); |
| 1056 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1057 | mark_inode_dirty(inode); |
| 1058 | } |
| 1059 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1060 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
| 1061 | struct page **prepared_pages, |
| 1062 | const char __user * buf) |
| 1063 | { |
| 1064 | long page_fault = 0; |
| 1065 | int i; |
| 1066 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1067 | |
| 1068 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { |
| 1069 | size_t count = min_t(size_t, |
| 1070 | PAGE_CACHE_SIZE - offset, write_bytes); |
| 1071 | struct page *page = prepared_pages[i]; |
| 1072 | fault_in_pages_readable(buf, count); |
| 1073 | |
| 1074 | /* Copy data from userspace to the current page */ |
| 1075 | kmap(page); |
| 1076 | page_fault = __copy_from_user(page_address(page) + offset, |
| 1077 | buf, count); |
| 1078 | /* Flush processor's dcache for this page */ |
| 1079 | flush_dcache_page(page); |
| 1080 | kunmap(page); |
| 1081 | buf += count; |
| 1082 | write_bytes -= count; |
| 1083 | |
| 1084 | if (page_fault) |
| 1085 | break; |
| 1086 | } |
| 1087 | return page_fault ? -EFAULT : 0; |
| 1088 | } |
| 1089 | |
| 1090 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
| 1091 | { |
| 1092 | size_t i; |
| 1093 | for (i = 0; i < num_pages; i++) { |
| 1094 | if (!pages[i]) |
| 1095 | break; |
| 1096 | unlock_page(pages[i]); |
| 1097 | mark_page_accessed(pages[i]); |
| 1098 | page_cache_release(pages[i]); |
| 1099 | } |
| 1100 | } |
| 1101 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
| 1102 | struct btrfs_root *root, |
| 1103 | struct file *file, |
| 1104 | struct page **pages, |
| 1105 | size_t num_pages, |
| 1106 | loff_t pos, |
| 1107 | size_t write_bytes) |
| 1108 | { |
| 1109 | int i; |
| 1110 | int offset; |
| 1111 | int err = 0; |
| 1112 | int ret; |
| 1113 | int this_write; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1114 | struct inode *inode = file->f_path.dentry->d_inode; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1115 | |
| 1116 | for (i = 0; i < num_pages; i++) { |
| 1117 | offset = pos & (PAGE_CACHE_SIZE -1); |
| 1118 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1119 | /* FIXME, one block at a time */ |
| 1120 | |
| 1121 | mutex_lock(&root->fs_info->fs_mutex); |
| 1122 | trans = btrfs_start_transaction(root, 1); |
| 1123 | btrfs_csum_file_block(trans, root, inode->i_ino, |
| 1124 | pages[i]->index << PAGE_CACHE_SHIFT, |
| 1125 | kmap(pages[i]), PAGE_CACHE_SIZE); |
| 1126 | kunmap(pages[i]); |
| 1127 | SetPageChecked(pages[i]); |
| 1128 | ret = btrfs_end_transaction(trans, root); |
| 1129 | BUG_ON(ret); |
| 1130 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1131 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1132 | ret = nobh_commit_write(file, pages[i], offset, |
| 1133 | offset + this_write); |
| 1134 | pos += this_write; |
| 1135 | if (ret) { |
| 1136 | err = ret; |
| 1137 | goto failed; |
| 1138 | } |
| 1139 | WARN_ON(this_write > write_bytes); |
| 1140 | write_bytes -= this_write; |
| 1141 | } |
| 1142 | failed: |
| 1143 | return err; |
| 1144 | } |
| 1145 | |
| 1146 | static int prepare_pages(struct btrfs_trans_handle *trans, |
| 1147 | struct btrfs_root *root, |
| 1148 | struct file *file, |
| 1149 | struct page **pages, |
| 1150 | size_t num_pages, |
| 1151 | loff_t pos, |
| 1152 | size_t write_bytes) |
| 1153 | { |
| 1154 | int i; |
| 1155 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
| 1156 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1157 | int offset; |
| 1158 | int err = 0; |
| 1159 | int ret; |
| 1160 | int this_write; |
| 1161 | loff_t isize = i_size_read(inode); |
| 1162 | |
| 1163 | memset(pages, 0, num_pages * sizeof(struct page *)); |
| 1164 | |
| 1165 | for (i = 0; i < num_pages; i++) { |
| 1166 | pages[i] = grab_cache_page(inode->i_mapping, index + i); |
| 1167 | if (!pages[i]) { |
| 1168 | err = -ENOMEM; |
| 1169 | goto failed_release; |
| 1170 | } |
| 1171 | offset = pos & (PAGE_CACHE_SIZE -1); |
| 1172 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); |
| 1173 | ret = nobh_prepare_write(pages[i], offset, |
| 1174 | offset + this_write, |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1175 | btrfs_get_block); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1176 | pos += this_write; |
| 1177 | if (ret) { |
| 1178 | err = ret; |
| 1179 | goto failed_truncate; |
| 1180 | } |
| 1181 | WARN_ON(this_write > write_bytes); |
| 1182 | write_bytes -= this_write; |
| 1183 | } |
| 1184 | return 0; |
| 1185 | |
| 1186 | failed_release: |
| 1187 | btrfs_drop_pages(pages, num_pages); |
| 1188 | return err; |
| 1189 | |
| 1190 | failed_truncate: |
| 1191 | btrfs_drop_pages(pages, num_pages); |
| 1192 | if (pos > isize) |
| 1193 | vmtruncate(inode, isize); |
| 1194 | return err; |
| 1195 | } |
| 1196 | |
| 1197 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, |
| 1198 | size_t count, loff_t *ppos) |
| 1199 | { |
| 1200 | loff_t pos; |
| 1201 | size_t num_written = 0; |
| 1202 | int err = 0; |
| 1203 | int ret = 0; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1204 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1205 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 1206 | struct page *pages[1]; |
| 1207 | |
| 1208 | if (file->f_flags & O_DIRECT) |
| 1209 | return -EINVAL; |
| 1210 | pos = *ppos; |
| 1211 | |
| 1212 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| 1213 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 1214 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 1215 | if (err) |
| 1216 | goto out; |
| 1217 | if (count == 0) |
| 1218 | goto out; |
| 1219 | err = remove_suid(file->f_path.dentry); |
| 1220 | if (err) |
| 1221 | goto out; |
| 1222 | file_update_time(file); |
| 1223 | mutex_lock(&inode->i_mutex); |
| 1224 | while(count > 0) { |
| 1225 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1226 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); |
| 1227 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
| 1228 | PAGE_CACHE_SHIFT; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1229 | ret = prepare_pages(NULL, root, file, pages, num_pages, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1230 | pos, write_bytes); |
| 1231 | BUG_ON(ret); |
| 1232 | ret = btrfs_copy_from_user(pos, num_pages, |
| 1233 | write_bytes, pages, buf); |
| 1234 | BUG_ON(ret); |
| 1235 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1236 | ret = dirty_and_release_pages(NULL, root, file, pages, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1237 | num_pages, pos, write_bytes); |
| 1238 | BUG_ON(ret); |
| 1239 | btrfs_drop_pages(pages, num_pages); |
| 1240 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1241 | buf += write_bytes; |
| 1242 | count -= write_bytes; |
| 1243 | pos += write_bytes; |
| 1244 | num_written += write_bytes; |
| 1245 | |
| 1246 | balance_dirty_pages_ratelimited(inode->i_mapping); |
| 1247 | cond_resched(); |
| 1248 | } |
| 1249 | mutex_unlock(&inode->i_mutex); |
| 1250 | out: |
| 1251 | *ppos = pos; |
| 1252 | current->backing_dev_info = NULL; |
| 1253 | return num_written ? num_written : err; |
| 1254 | } |
| 1255 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1256 | #if 0 |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 1257 | static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode, |
| 1258 | struct page *page, loff_t pos, |
| 1259 | size_t offset, size_t write_bytes) |
| 1260 | { |
| 1261 | struct btrfs_path *path; |
| 1262 | struct btrfs_trans_handle *trans; |
| 1263 | struct btrfs_key key; |
| 1264 | struct btrfs_leaf *leaf; |
| 1265 | struct btrfs_key found_key; |
| 1266 | int ret; |
| 1267 | size_t copy_size = 0; |
| 1268 | char *dst = NULL; |
| 1269 | int err = 0; |
| 1270 | size_t num_written = 0; |
| 1271 | |
| 1272 | path = btrfs_alloc_path(); |
| 1273 | BUG_ON(!path); |
| 1274 | mutex_lock(&root->fs_info->fs_mutex); |
| 1275 | trans = btrfs_start_transaction(root, 1); |
| 1276 | key.objectid = inode->i_ino; |
| 1277 | key.flags = 0; |
| 1278 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); |
| 1279 | |
| 1280 | again: |
| 1281 | key.offset = pos; |
| 1282 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 1283 | if (ret < 0) { |
| 1284 | err = ret; |
| 1285 | goto out; |
| 1286 | } |
| 1287 | if (ret == 0) { |
| 1288 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 1289 | btrfs_disk_key_to_cpu(&found_key, |
| 1290 | &leaf->items[path->slots[0]].key); |
| 1291 | copy_size = btrfs_item_size(leaf->items + path->slots[0]); |
| 1292 | dst = btrfs_item_ptr(leaf, path->slots[0], char); |
| 1293 | copy_size = min(write_bytes, copy_size); |
| 1294 | goto copyit; |
| 1295 | } else { |
| 1296 | int slot = path->slots[0]; |
| 1297 | if (slot > 0) { |
| 1298 | slot--; |
| 1299 | } |
| 1300 | // FIXME find max key |
| 1301 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 1302 | btrfs_disk_key_to_cpu(&found_key, |
| 1303 | &leaf->items[slot].key); |
| 1304 | if (found_key.objectid != inode->i_ino) |
| 1305 | goto insert; |
| 1306 | if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY) |
| 1307 | goto insert; |
| 1308 | copy_size = btrfs_item_size(leaf->items + slot); |
| 1309 | if (found_key.offset + copy_size <= pos) |
| 1310 | goto insert; |
| 1311 | dst = btrfs_item_ptr(leaf, path->slots[0], char); |
| 1312 | dst += pos - found_key.offset; |
| 1313 | copy_size = copy_size - (pos - found_key.offset); |
| 1314 | BUG_ON(copy_size < 0); |
| 1315 | copy_size = min(write_bytes, copy_size); |
| 1316 | WARN_ON(copy_size == 0); |
| 1317 | goto copyit; |
| 1318 | } |
| 1319 | insert: |
| 1320 | btrfs_release_path(root, path); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1321 | copy_size = min(write_bytes, |
| 1322 | (size_t)BTRFS_LEAF_DATA_SIZE(root) - |
| 1323 | sizeof(struct btrfs_item) * 4); |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 1324 | ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size); |
| 1325 | BUG_ON(ret); |
| 1326 | dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 1327 | path->slots[0], char); |
| 1328 | copyit: |
| 1329 | WARN_ON(copy_size == 0); |
| 1330 | WARN_ON(dst + copy_size > |
| 1331 | btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 1332 | path->slots[0], char) + |
| 1333 | btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items + |
| 1334 | path->slots[0])); |
| 1335 | btrfs_memcpy(root, path->nodes[0]->b_data, dst, |
| 1336 | page_address(page) + offset, copy_size); |
| 1337 | mark_buffer_dirty(path->nodes[0]); |
| 1338 | btrfs_release_path(root, path); |
| 1339 | pos += copy_size; |
| 1340 | offset += copy_size; |
| 1341 | num_written += copy_size; |
| 1342 | write_bytes -= copy_size; |
| 1343 | if (write_bytes) |
| 1344 | goto again; |
| 1345 | out: |
| 1346 | btrfs_free_path(path); |
| 1347 | ret = btrfs_end_transaction(trans, root); |
| 1348 | BUG_ON(ret); |
| 1349 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1350 | return num_written ? num_written : err; |
| 1351 | } |
| 1352 | |
| 1353 | static ssize_t btrfs_file_inline_write(struct file *file, |
| 1354 | const char __user *buf, |
| 1355 | size_t count, loff_t *ppos) |
| 1356 | { |
| 1357 | loff_t pos; |
| 1358 | size_t num_written = 0; |
| 1359 | int err = 0; |
| 1360 | int ret = 0; |
| 1361 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1362 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
| 1363 | unsigned long page_index; |
| 1364 | |
| 1365 | if (file->f_flags & O_DIRECT) |
| 1366 | return -EINVAL; |
| 1367 | pos = *ppos; |
| 1368 | |
| 1369 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| 1370 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 1371 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 1372 | if (err) |
| 1373 | goto out; |
| 1374 | if (count == 0) |
| 1375 | goto out; |
| 1376 | err = remove_suid(file->f_path.dentry); |
| 1377 | if (err) |
| 1378 | goto out; |
| 1379 | file_update_time(file); |
| 1380 | mutex_lock(&inode->i_mutex); |
| 1381 | while(count > 0) { |
| 1382 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1383 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); |
| 1384 | struct page *page; |
| 1385 | |
| 1386 | page_index = pos >> PAGE_CACHE_SHIFT; |
| 1387 | page = grab_cache_page(inode->i_mapping, page_index); |
| 1388 | if (!PageUptodate(page)) { |
| 1389 | ret = mpage_readpage(page, btrfs_get_block); |
| 1390 | BUG_ON(ret); |
| 1391 | lock_page(page); |
| 1392 | } |
| 1393 | ret = btrfs_copy_from_user(pos, 1, |
| 1394 | write_bytes, &page, buf); |
| 1395 | BUG_ON(ret); |
| 1396 | write_bytes = inline_one_page(root, inode, page, pos, |
| 1397 | offset, write_bytes); |
| 1398 | SetPageUptodate(page); |
| 1399 | if (write_bytes > 0 && pos + write_bytes > inode->i_size) { |
| 1400 | i_size_write(inode, pos + write_bytes); |
| 1401 | mark_inode_dirty(inode); |
| 1402 | } |
| 1403 | page_cache_release(page); |
| 1404 | unlock_page(page); |
| 1405 | if (write_bytes < 0) |
| 1406 | goto out_unlock; |
| 1407 | buf += write_bytes; |
| 1408 | count -= write_bytes; |
| 1409 | pos += write_bytes; |
| 1410 | num_written += write_bytes; |
| 1411 | |
| 1412 | balance_dirty_pages_ratelimited(inode->i_mapping); |
| 1413 | cond_resched(); |
| 1414 | } |
| 1415 | out_unlock: |
| 1416 | mutex_unlock(&inode->i_mutex); |
| 1417 | out: |
| 1418 | *ppos = pos; |
| 1419 | current->backing_dev_info = NULL; |
| 1420 | return num_written ? num_written : err; |
| 1421 | } |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1422 | #endif |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 1423 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1424 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
| 1425 | unsigned long offset, unsigned long size) |
| 1426 | { |
| 1427 | char *kaddr; |
| 1428 | unsigned long left, count = desc->count; |
| 1429 | |
| 1430 | if (size > count) |
| 1431 | size = count; |
| 1432 | |
| 1433 | if (!PageChecked(page)) { |
| 1434 | /* FIXME, do it per block */ |
| 1435 | struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb); |
| 1436 | int ret = btrfs_csum_verify_file_block(root, |
| 1437 | page->mapping->host->i_ino, |
| 1438 | page->index << PAGE_CACHE_SHIFT, |
| 1439 | kmap(page), PAGE_CACHE_SIZE); |
| 1440 | if (ret) { |
| 1441 | printk("failed to verify ino %lu page %lu\n", |
| 1442 | page->mapping->host->i_ino, |
| 1443 | page->index); |
| 1444 | memset(page_address(page), 0, PAGE_CACHE_SIZE); |
| 1445 | } |
| 1446 | SetPageChecked(page); |
| 1447 | kunmap(page); |
| 1448 | } |
| 1449 | /* |
| 1450 | * Faults on the destination of a read are common, so do it before |
| 1451 | * taking the kmap. |
| 1452 | */ |
| 1453 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { |
| 1454 | kaddr = kmap_atomic(page, KM_USER0); |
| 1455 | left = __copy_to_user_inatomic(desc->arg.buf, |
| 1456 | kaddr + offset, size); |
| 1457 | kunmap_atomic(kaddr, KM_USER0); |
| 1458 | if (left == 0) |
| 1459 | goto success; |
| 1460 | } |
| 1461 | |
| 1462 | /* Do it the slow way */ |
| 1463 | kaddr = kmap(page); |
| 1464 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); |
| 1465 | kunmap(page); |
| 1466 | |
| 1467 | if (left) { |
| 1468 | size -= left; |
| 1469 | desc->error = -EFAULT; |
| 1470 | } |
| 1471 | success: |
| 1472 | desc->count = count - size; |
| 1473 | desc->written += size; |
| 1474 | desc->arg.buf += size; |
| 1475 | return size; |
| 1476 | } |
| 1477 | |
| 1478 | /** |
| 1479 | * btrfs_file_aio_read - filesystem read routine |
| 1480 | * @iocb: kernel I/O control block |
| 1481 | * @iov: io vector request |
| 1482 | * @nr_segs: number of segments in the iovec |
| 1483 | * @pos: current file position |
| 1484 | */ |
| 1485 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 1486 | unsigned long nr_segs, loff_t pos) |
| 1487 | { |
| 1488 | struct file *filp = iocb->ki_filp; |
| 1489 | ssize_t retval; |
| 1490 | unsigned long seg; |
| 1491 | size_t count; |
| 1492 | loff_t *ppos = &iocb->ki_pos; |
| 1493 | |
| 1494 | count = 0; |
| 1495 | for (seg = 0; seg < nr_segs; seg++) { |
| 1496 | const struct iovec *iv = &iov[seg]; |
| 1497 | |
| 1498 | /* |
| 1499 | * If any segment has a negative length, or the cumulative |
| 1500 | * length ever wraps negative then return -EINVAL. |
| 1501 | */ |
| 1502 | count += iv->iov_len; |
| 1503 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) |
| 1504 | return -EINVAL; |
| 1505 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) |
| 1506 | continue; |
| 1507 | if (seg == 0) |
| 1508 | return -EFAULT; |
| 1509 | nr_segs = seg; |
| 1510 | count -= iv->iov_len; /* This segment is no good */ |
| 1511 | break; |
| 1512 | } |
| 1513 | retval = 0; |
| 1514 | if (count) { |
| 1515 | for (seg = 0; seg < nr_segs; seg++) { |
| 1516 | read_descriptor_t desc; |
| 1517 | |
| 1518 | desc.written = 0; |
| 1519 | desc.arg.buf = iov[seg].iov_base; |
| 1520 | desc.count = iov[seg].iov_len; |
| 1521 | if (desc.count == 0) |
| 1522 | continue; |
| 1523 | desc.error = 0; |
| 1524 | do_generic_file_read(filp, ppos, &desc, |
| 1525 | btrfs_read_actor); |
| 1526 | retval += desc.written; |
| 1527 | if (desc.error) { |
| 1528 | retval = retval ?: desc.error; |
| 1529 | break; |
| 1530 | } |
| 1531 | } |
| 1532 | } |
| 1533 | return retval; |
| 1534 | } |
| 1535 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1536 | static struct kmem_cache *btrfs_inode_cachep; |
| 1537 | struct kmem_cache *btrfs_trans_handle_cachep; |
| 1538 | struct kmem_cache *btrfs_transaction_cachep; |
| 1539 | struct kmem_cache *btrfs_bit_radix_cachep; |
| 1540 | struct kmem_cache *btrfs_path_cachep; |
| 1541 | |
| 1542 | /* |
| 1543 | * Called inside transaction, so use GFP_NOFS |
| 1544 | */ |
| 1545 | static struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 1546 | { |
| 1547 | struct btrfs_inode *ei; |
| 1548 | |
| 1549 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 1550 | if (!ei) |
| 1551 | return NULL; |
| 1552 | ei->magic = 0xDEADBEEF; |
| 1553 | ei->magic2 = 0xDEADBEAF; |
| 1554 | return &ei->vfs_inode; |
| 1555 | } |
| 1556 | |
| 1557 | static void btrfs_destroy_inode(struct inode *inode) |
| 1558 | { |
| 1559 | struct btrfs_inode *ei = BTRFS_I(inode); |
| 1560 | WARN_ON(ei->magic != 0xDEADBEEF); |
| 1561 | WARN_ON(ei->magic2 != 0xDEADBEAF); |
| 1562 | WARN_ON(!list_empty(&inode->i_dentry)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1563 | WARN_ON(inode->i_data.nrpages); |
| 1564 | |
| 1565 | ei->magic = 0; |
| 1566 | ei->magic2 = 0; |
| 1567 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 1568 | } |
| 1569 | |
| 1570 | static void init_once(void * foo, struct kmem_cache * cachep, |
| 1571 | unsigned long flags) |
| 1572 | { |
| 1573 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 1574 | |
| 1575 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 1576 | SLAB_CTOR_CONSTRUCTOR) { |
| 1577 | inode_init_once(&ei->vfs_inode); |
| 1578 | } |
| 1579 | } |
| 1580 | |
| 1581 | static int init_inodecache(void) |
| 1582 | { |
| 1583 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 1584 | sizeof(struct btrfs_inode), |
| 1585 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1586 | SLAB_MEM_SPREAD), |
| 1587 | init_once, NULL); |
| 1588 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 1589 | sizeof(struct btrfs_trans_handle), |
| 1590 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1591 | SLAB_MEM_SPREAD), |
| 1592 | NULL, NULL); |
| 1593 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 1594 | sizeof(struct btrfs_transaction), |
| 1595 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1596 | SLAB_MEM_SPREAD), |
| 1597 | NULL, NULL); |
| 1598 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 1599 | sizeof(struct btrfs_transaction), |
| 1600 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1601 | SLAB_MEM_SPREAD), |
| 1602 | NULL, NULL); |
| 1603 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", |
| 1604 | 256, |
| 1605 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1606 | SLAB_MEM_SPREAD | |
| 1607 | SLAB_DESTROY_BY_RCU), |
| 1608 | NULL, NULL); |
| 1609 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || |
| 1610 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) |
| 1611 | return -ENOMEM; |
| 1612 | return 0; |
| 1613 | } |
| 1614 | |
| 1615 | static void destroy_inodecache(void) |
| 1616 | { |
| 1617 | kmem_cache_destroy(btrfs_inode_cachep); |
| 1618 | kmem_cache_destroy(btrfs_trans_handle_cachep); |
| 1619 | kmem_cache_destroy(btrfs_transaction_cachep); |
| 1620 | kmem_cache_destroy(btrfs_bit_radix_cachep); |
| 1621 | kmem_cache_destroy(btrfs_path_cachep); |
| 1622 | } |
| 1623 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1624 | static int btrfs_get_sb(struct file_system_type *fs_type, |
| 1625 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| 1626 | { |
| 1627 | return get_sb_bdev(fs_type, flags, dev_name, data, |
| 1628 | btrfs_fill_super, mnt); |
| 1629 | } |
| 1630 | |
| 1631 | static struct file_system_type btrfs_fs_type = { |
| 1632 | .owner = THIS_MODULE, |
| 1633 | .name = "btrfs", |
| 1634 | .get_sb = btrfs_get_sb, |
| 1635 | .kill_sb = kill_block_super, |
| 1636 | .fs_flags = FS_REQUIRES_DEV, |
| 1637 | }; |
| 1638 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1639 | static struct super_operations btrfs_super_ops = { |
| 1640 | .statfs = simple_statfs, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 1641 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1642 | .put_super = btrfs_put_super, |
| 1643 | .read_inode = btrfs_read_locked_inode, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1644 | .write_super = btrfs_write_super, |
| 1645 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1646 | .write_inode = btrfs_write_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1647 | .alloc_inode = btrfs_alloc_inode, |
| 1648 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1649 | }; |
| 1650 | |
| 1651 | static struct inode_operations btrfs_dir_inode_operations = { |
| 1652 | .lookup = btrfs_lookup, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1653 | .create = btrfs_create, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 1654 | .unlink = btrfs_unlink, |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1655 | .mkdir = btrfs_mkdir, |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 1656 | .rmdir = btrfs_rmdir, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1657 | }; |
| 1658 | |
| 1659 | static struct file_operations btrfs_dir_file_operations = { |
| 1660 | .llseek = generic_file_llseek, |
| 1661 | .read = generic_read_dir, |
| 1662 | .readdir = btrfs_readdir, |
| 1663 | }; |
| 1664 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1665 | static struct address_space_operations btrfs_aops = { |
| 1666 | .readpage = btrfs_readpage, |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1667 | .readpages = btrfs_readpages, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1668 | .writepage = btrfs_writepage, |
| 1669 | .sync_page = block_sync_page, |
| 1670 | .prepare_write = btrfs_prepare_write, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1671 | .commit_write = btrfs_commit_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1672 | }; |
| 1673 | |
| 1674 | static struct inode_operations btrfs_file_inode_operations = { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1675 | .truncate = btrfs_truncate, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1676 | }; |
| 1677 | |
| 1678 | static struct file_operations btrfs_file_operations = { |
| 1679 | .llseek = generic_file_llseek, |
| 1680 | .read = do_sync_read, |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1681 | .aio_read = btrfs_file_aio_read, |
| 1682 | .write = btrfs_file_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1683 | .mmap = generic_file_mmap, |
| 1684 | .open = generic_file_open, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1685 | }; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1686 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1687 | static int __init init_btrfs_fs(void) |
| 1688 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1689 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1690 | printk("btrfs loaded!\n"); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1691 | err = init_inodecache(); |
| 1692 | if (err) |
| 1693 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1694 | return register_filesystem(&btrfs_fs_type); |
| 1695 | } |
| 1696 | |
| 1697 | static void __exit exit_btrfs_fs(void) |
| 1698 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1699 | destroy_inodecache(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1700 | unregister_filesystem(&btrfs_fs_type); |
| 1701 | printk("btrfs unloaded\n"); |
| 1702 | } |
| 1703 | |
| 1704 | module_init(init_btrfs_fs) |
| 1705 | module_exit(exit_btrfs_fs) |
| 1706 | |
| 1707 | MODULE_LICENSE("GPL"); |