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 | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 14 | #include <linux/statfs.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 15 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 16 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 17 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 18 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 19 | #include "ioctl.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 20 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 21 | static void btrfs_fsinfo_release(struct kobject *obj) |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 22 | { |
| 23 | struct btrfs_fs_info *fsinfo = container_of(obj, |
| 24 | struct btrfs_fs_info, kobj); |
| 25 | kfree(fsinfo); |
| 26 | } |
| 27 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 28 | static struct kobj_type btrfs_fsinfo_ktype = { |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 29 | .release = btrfs_fsinfo_release, |
| 30 | }; |
| 31 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 32 | struct btrfs_iget_args { |
| 33 | u64 ino; |
| 34 | struct btrfs_root *root; |
| 35 | }; |
| 36 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 37 | decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL); |
| 38 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 39 | #define BTRFS_SUPER_MAGIC 0x9123682E |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 40 | |
| 41 | static struct inode_operations btrfs_dir_inode_operations; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 42 | static struct inode_operations btrfs_dir_ro_inode_operations; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 43 | static struct super_operations btrfs_super_ops; |
| 44 | static struct file_operations btrfs_dir_file_operations; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 45 | static struct inode_operations btrfs_file_inode_operations; |
| 46 | static struct address_space_operations btrfs_aops; |
| 47 | static struct file_operations btrfs_file_operations; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 48 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 49 | static void btrfs_read_locked_inode(struct inode *inode) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 50 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 51 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 52 | struct btrfs_inode_item *inode_item; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 53 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 54 | struct btrfs_key location; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 55 | struct btrfs_block_group_cache *alloc_group; |
| 56 | u64 alloc_group_block; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 57 | int ret; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 58 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 59 | path = btrfs_alloc_path(); |
| 60 | BUG_ON(!path); |
| 61 | btrfs_init_path(path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 62 | mutex_lock(&root->fs_info->fs_mutex); |
| 63 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 64 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
| 65 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 66 | if (ret) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 67 | btrfs_free_path(path); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 68 | goto make_bad; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 69 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 70 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 71 | path->slots[0], |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 72 | struct btrfs_inode_item); |
| 73 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 74 | inode->i_mode = btrfs_inode_mode(inode_item); |
| 75 | inode->i_nlink = btrfs_inode_nlink(inode_item); |
| 76 | inode->i_uid = btrfs_inode_uid(inode_item); |
| 77 | inode->i_gid = btrfs_inode_gid(inode_item); |
| 78 | inode->i_size = btrfs_inode_size(inode_item); |
| 79 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); |
| 80 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); |
| 81 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); |
| 82 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); |
| 83 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); |
| 84 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); |
| 85 | inode->i_blocks = btrfs_inode_nblocks(inode_item); |
| 86 | inode->i_generation = btrfs_inode_generation(inode_item); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 87 | alloc_group_block = btrfs_inode_block_group(inode_item); |
| 88 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, |
| 89 | (void **)&alloc_group, |
| 90 | alloc_group_block, 1); |
| 91 | BUG_ON(!ret); |
| 92 | BTRFS_I(inode)->block_group = alloc_group; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 93 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 94 | btrfs_free_path(path); |
| 95 | inode_item = NULL; |
| 96 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 97 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 1b05da2 | 2007-04-10 12:13:09 -0400 | [diff] [blame] | 98 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 99 | switch (inode->i_mode & S_IFMT) { |
| 100 | #if 0 |
| 101 | default: |
| 102 | init_special_inode(inode, inode->i_mode, |
| 103 | btrfs_inode_rdev(inode_item)); |
| 104 | break; |
| 105 | #endif |
| 106 | case S_IFREG: |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 107 | inode->i_mapping->a_ops = &btrfs_aops; |
| 108 | inode->i_fop = &btrfs_file_operations; |
| 109 | inode->i_op = &btrfs_file_inode_operations; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 110 | break; |
| 111 | case S_IFDIR: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 112 | inode->i_fop = &btrfs_dir_file_operations; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 113 | if (root == root->fs_info->tree_root) |
| 114 | inode->i_op = &btrfs_dir_ro_inode_operations; |
| 115 | else |
| 116 | inode->i_op = &btrfs_dir_inode_operations; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 117 | break; |
| 118 | case S_IFLNK: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 119 | // inode->i_op = &page_symlink_inode_operations; |
| 120 | break; |
| 121 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 122 | return; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 123 | |
| 124 | make_bad: |
| 125 | btrfs_release_path(root, path); |
| 126 | btrfs_free_path(path); |
| 127 | mutex_unlock(&root->fs_info->fs_mutex); |
| 128 | make_bad_inode(inode); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 129 | } |
| 130 | |
Chris Mason | f68cad0 | 2007-04-24 12:44:26 -0400 | [diff] [blame] | 131 | static void fill_inode_item(struct btrfs_inode_item *item, |
| 132 | struct inode *inode) |
| 133 | { |
| 134 | btrfs_set_inode_uid(item, inode->i_uid); |
| 135 | btrfs_set_inode_gid(item, inode->i_gid); |
| 136 | btrfs_set_inode_size(item, inode->i_size); |
| 137 | btrfs_set_inode_mode(item, inode->i_mode); |
| 138 | btrfs_set_inode_nlink(item, inode->i_nlink); |
| 139 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); |
| 140 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); |
| 141 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); |
| 142 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); |
| 143 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); |
| 144 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); |
| 145 | btrfs_set_inode_nblocks(item, inode->i_blocks); |
| 146 | btrfs_set_inode_generation(item, inode->i_generation); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 147 | btrfs_set_inode_block_group(item, |
| 148 | BTRFS_I(inode)->block_group->key.objectid); |
Chris Mason | f68cad0 | 2007-04-24 12:44:26 -0400 | [diff] [blame] | 149 | } |
| 150 | |
Chris Mason | f68cad0 | 2007-04-24 12:44:26 -0400 | [diff] [blame] | 151 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 152 | struct btrfs_root *root, |
| 153 | struct inode *inode) |
| 154 | { |
| 155 | struct btrfs_inode_item *inode_item; |
| 156 | struct btrfs_path *path; |
| 157 | int ret; |
| 158 | |
| 159 | path = btrfs_alloc_path(); |
| 160 | BUG_ON(!path); |
| 161 | btrfs_init_path(path); |
| 162 | ret = btrfs_lookup_inode(trans, root, path, |
| 163 | &BTRFS_I(inode)->location, 1); |
| 164 | if (ret) { |
| 165 | if (ret > 0) |
| 166 | ret = -ENOENT; |
| 167 | goto failed; |
| 168 | } |
| 169 | |
| 170 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 171 | path->slots[0], |
| 172 | struct btrfs_inode_item); |
| 173 | |
| 174 | fill_inode_item(inode_item, inode); |
| 175 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 176 | ret = 0; |
| 177 | failed: |
| 178 | btrfs_release_path(root, path); |
| 179 | btrfs_free_path(path); |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 184 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
| 185 | struct btrfs_root *root, |
| 186 | struct inode *dir, |
| 187 | struct dentry *dentry) |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 188 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 189 | struct btrfs_path *path; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 190 | const char *name = dentry->d_name.name; |
| 191 | int name_len = dentry->d_name.len; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 192 | int ret = 0; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 193 | u64 objectid; |
| 194 | struct btrfs_dir_item *di; |
| 195 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 196 | path = btrfs_alloc_path(); |
| 197 | BUG_ON(!path); |
| 198 | btrfs_init_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 199 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 200 | name, name_len, -1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 201 | if (IS_ERR(di)) { |
| 202 | ret = PTR_ERR(di); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 203 | goto err; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 204 | } |
| 205 | if (!di) { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 206 | ret = -ENOENT; |
| 207 | goto err; |
| 208 | } |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 209 | objectid = btrfs_disk_key_objectid(&di->location); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 210 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
| 211 | BUG_ON(ret); |
| 212 | btrfs_release_path(root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 213 | |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 214 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
| 215 | objectid, name, name_len, -1); |
| 216 | if (IS_ERR(di)) { |
| 217 | ret = PTR_ERR(di); |
| 218 | goto err; |
| 219 | } |
| 220 | if (!di) { |
| 221 | ret = -ENOENT; |
| 222 | goto err; |
| 223 | } |
| 224 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 225 | BUG_ON(ret); |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 226 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 227 | dentry->d_inode->i_ctime = dir->i_ctime; |
| 228 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 229 | btrfs_free_path(path); |
Chris Mason | f68cad0 | 2007-04-24 12:44:26 -0400 | [diff] [blame] | 230 | if (!ret) { |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 231 | dir->i_size -= name_len * 2; |
Chris Mason | f68cad0 | 2007-04-24 12:44:26 -0400 | [diff] [blame] | 232 | btrfs_update_inode(trans, root, dir); |
| 233 | drop_nlink(dentry->d_inode); |
| 234 | btrfs_update_inode(trans, root, dentry->d_inode); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 235 | dir->i_sb->s_dirt = 1; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 236 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 237 | return ret; |
| 238 | } |
| 239 | |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 240 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 241 | { |
| 242 | struct btrfs_root *root; |
| 243 | struct btrfs_trans_handle *trans; |
| 244 | int ret; |
| 245 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 246 | root = BTRFS_I(dir)->root; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 247 | mutex_lock(&root->fs_info->fs_mutex); |
| 248 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 249 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 250 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
| 251 | btrfs_end_transaction(trans, root); |
| 252 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 253 | btrfs_btree_balance_dirty(root); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 258 | { |
| 259 | struct inode *inode = dentry->d_inode; |
| 260 | int err; |
| 261 | int ret; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 262 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 263 | struct btrfs_path *path; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 264 | struct btrfs_key key; |
| 265 | struct btrfs_trans_handle *trans; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 266 | struct btrfs_key found_key; |
| 267 | int found_type; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 268 | struct btrfs_leaf *leaf; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 269 | char *goodnames = ".."; |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 270 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 271 | path = btrfs_alloc_path(); |
| 272 | BUG_ON(!path); |
| 273 | btrfs_init_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 274 | mutex_lock(&root->fs_info->fs_mutex); |
| 275 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 276 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 277 | key.objectid = inode->i_ino; |
| 278 | key.offset = (u64)-1; |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 279 | key.flags = (u32)-1; |
| 280 | while(1) { |
| 281 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 282 | if (ret < 0) { |
| 283 | err = ret; |
| 284 | goto out; |
| 285 | } |
| 286 | BUG_ON(ret == 0); |
| 287 | if (path->slots[0] == 0) { |
| 288 | err = -ENOENT; |
| 289 | goto out; |
| 290 | } |
| 291 | path->slots[0]--; |
| 292 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 293 | btrfs_disk_key_to_cpu(&found_key, |
| 294 | &leaf->items[path->slots[0]].key); |
| 295 | found_type = btrfs_key_type(&found_key); |
| 296 | if (found_key.objectid != inode->i_ino) { |
| 297 | err = -ENOENT; |
| 298 | goto out; |
| 299 | } |
| 300 | if ((found_type != BTRFS_DIR_ITEM_KEY && |
| 301 | found_type != BTRFS_DIR_INDEX_KEY) || |
| 302 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && |
| 303 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { |
| 304 | err = -ENOTEMPTY; |
| 305 | goto out; |
| 306 | } |
| 307 | ret = btrfs_del_item(trans, root, path); |
| 308 | BUG_ON(ret); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 309 | |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 310 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
| 311 | break; |
| 312 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 313 | } |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 314 | ret = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 315 | btrfs_release_path(root, path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 316 | |
| 317 | /* now the directory is empty */ |
| 318 | err = btrfs_unlink_trans(trans, root, dir, dentry); |
| 319 | if (!err) { |
| 320 | inode->i_size = 0; |
| 321 | } |
| 322 | out: |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 323 | btrfs_release_path(root, path); |
| 324 | btrfs_free_path(path); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 325 | mutex_unlock(&root->fs_info->fs_mutex); |
| 326 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 327 | btrfs_btree_balance_dirty(root); |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 328 | if (ret && !err) |
| 329 | err = ret; |
| 330 | return err; |
| 331 | } |
| 332 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 333 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
| 334 | struct btrfs_root *root, |
| 335 | struct inode *inode) |
| 336 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 337 | struct btrfs_path *path; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 338 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 339 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 340 | clear_inode(inode); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 341 | |
| 342 | path = btrfs_alloc_path(); |
| 343 | BUG_ON(!path); |
| 344 | btrfs_init_path(path); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 345 | ret = btrfs_lookup_inode(trans, root, path, |
| 346 | &BTRFS_I(inode)->location, -1); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 347 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 348 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 349 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 350 | btrfs_free_path(path); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 351 | return ret; |
| 352 | } |
| 353 | |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 354 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
| 355 | u64 objectid) |
| 356 | { |
| 357 | struct btrfs_node *node; |
| 358 | int i; |
| 359 | int nritems; |
| 360 | u64 item_objectid; |
| 361 | u64 blocknr; |
| 362 | int slot; |
| 363 | int ret; |
| 364 | |
| 365 | if (!path->nodes[1]) |
| 366 | return; |
| 367 | node = btrfs_buffer_node(path->nodes[1]); |
| 368 | slot = path->slots[1]; |
| 369 | if (slot == 0) |
| 370 | return; |
| 371 | nritems = btrfs_header_nritems(&node->header); |
| 372 | for (i = slot - 1; i >= 0; i--) { |
| 373 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
| 374 | if (item_objectid != objectid) |
| 375 | break; |
| 376 | blocknr = btrfs_node_blockptr(node, i); |
| 377 | ret = readahead_tree_block(root, blocknr); |
| 378 | if (ret) |
| 379 | break; |
| 380 | } |
| 381 | } |
| 382 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 383 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
| 384 | struct btrfs_root *root, |
| 385 | struct inode *inode) |
| 386 | { |
| 387 | int ret; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 388 | struct btrfs_path *path; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 389 | struct btrfs_key key; |
| 390 | struct btrfs_disk_key *found_key; |
| 391 | struct btrfs_leaf *leaf; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 392 | struct btrfs_file_extent_item *fi = NULL; |
| 393 | u64 extent_start = 0; |
| 394 | u64 extent_num_blocks = 0; |
| 395 | int found_extent; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 396 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 397 | path = btrfs_alloc_path(); |
| 398 | BUG_ON(!path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 399 | /* FIXME, add redo link to tree so we don't leak on crash */ |
| 400 | key.objectid = inode->i_ino; |
| 401 | key.offset = (u64)-1; |
| 402 | key.flags = 0; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 403 | /* |
| 404 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys |
| 405 | * or extent data |
| 406 | */ |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 407 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 408 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 409 | btrfs_init_path(path); |
| 410 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 411 | if (ret < 0) { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 412 | goto error; |
| 413 | } |
| 414 | if (ret > 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 415 | BUG_ON(path->slots[0] == 0); |
| 416 | path->slots[0]--; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 417 | } |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 418 | reada_truncate(root, path, inode->i_ino); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 419 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 420 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 421 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
| 422 | break; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 423 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
| 424 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 425 | break; |
| 426 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
| 427 | break; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 428 | found_extent = 0; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 429 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 430 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 431 | path->slots[0], |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 432 | struct btrfs_file_extent_item); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 433 | if (btrfs_file_extent_type(fi) != |
| 434 | BTRFS_FILE_EXTENT_INLINE) { |
| 435 | extent_start = |
| 436 | btrfs_file_extent_disk_blocknr(fi); |
| 437 | extent_num_blocks = |
| 438 | btrfs_file_extent_disk_num_blocks(fi); |
| 439 | /* FIXME blocksize != 4096 */ |
| 440 | inode->i_blocks -= |
| 441 | btrfs_file_extent_num_blocks(fi) << 3; |
| 442 | found_extent = 1; |
| 443 | } |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 444 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 445 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 446 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 447 | btrfs_release_path(root, path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 448 | if (found_extent) { |
| 449 | ret = btrfs_free_extent(trans, root, extent_start, |
| 450 | extent_num_blocks, 0); |
| 451 | BUG_ON(ret); |
| 452 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 453 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 454 | ret = 0; |
| 455 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 456 | btrfs_release_path(root, path); |
| 457 | btrfs_free_path(path); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 458 | inode->i_sb->s_dirt = 1; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 459 | return ret; |
| 460 | } |
| 461 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 462 | static void btrfs_delete_inode(struct inode *inode) |
| 463 | { |
| 464 | struct btrfs_trans_handle *trans; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 465 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 466 | int ret; |
| 467 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 468 | truncate_inode_pages(&inode->i_data, 0); |
| 469 | if (is_bad_inode(inode)) { |
| 470 | goto no_delete; |
| 471 | } |
| 472 | inode->i_size = 0; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 473 | mutex_lock(&root->fs_info->fs_mutex); |
| 474 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 475 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 476 | if (S_ISREG(inode->i_mode)) { |
| 477 | ret = btrfs_truncate_in_trans(trans, root, inode); |
| 478 | BUG_ON(ret); |
| 479 | } |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 480 | btrfs_free_inode(trans, root, inode); |
| 481 | btrfs_end_transaction(trans, root); |
| 482 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 483 | btrfs_btree_balance_dirty(root); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 484 | return; |
| 485 | no_delete: |
| 486 | clear_inode(inode); |
| 487 | } |
| 488 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 489 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 490 | struct btrfs_key *location) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 491 | { |
| 492 | const char *name = dentry->d_name.name; |
| 493 | int namelen = dentry->d_name.len; |
| 494 | struct btrfs_dir_item *di; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 495 | struct btrfs_path *path; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 496 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 497 | int ret; |
| 498 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 499 | path = btrfs_alloc_path(); |
| 500 | BUG_ON(!path); |
| 501 | btrfs_init_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 502 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 503 | namelen, 0); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 504 | if (!di || IS_ERR(di)) { |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 505 | location->objectid = 0; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 506 | ret = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 507 | goto out; |
| 508 | } |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 509 | btrfs_disk_key_to_cpu(location, &di->location); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 510 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 511 | btrfs_release_path(root, path); |
| 512 | btrfs_free_path(path); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 513 | return ret; |
| 514 | } |
| 515 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 516 | static int fixup_tree_root_location(struct btrfs_root *root, |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 517 | struct btrfs_key *location, |
| 518 | struct btrfs_root **sub_root) |
| 519 | { |
| 520 | struct btrfs_path *path; |
| 521 | struct btrfs_root_item *ri; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 522 | |
| 523 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) |
| 524 | return 0; |
| 525 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
| 526 | return 0; |
| 527 | |
| 528 | path = btrfs_alloc_path(); |
| 529 | BUG_ON(!path); |
| 530 | mutex_lock(&root->fs_info->fs_mutex); |
| 531 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 532 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
| 533 | if (IS_ERR(*sub_root)) |
| 534 | return PTR_ERR(*sub_root); |
| 535 | |
| 536 | ri = &(*sub_root)->root_item; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 537 | location->objectid = btrfs_root_dirid(ri); |
| 538 | location->flags = 0; |
| 539 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
| 540 | location->offset = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 541 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 542 | btrfs_free_path(path); |
| 543 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 544 | return 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 545 | } |
| 546 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 547 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 548 | { |
| 549 | struct btrfs_iget_args *args = p; |
| 550 | inode->i_ino = args->ino; |
| 551 | BTRFS_I(inode)->root = args->root; |
| 552 | return 0; |
| 553 | } |
| 554 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 555 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 556 | { |
| 557 | struct btrfs_iget_args *args = opaque; |
| 558 | return (args->ino == inode->i_ino && |
| 559 | args->root == BTRFS_I(inode)->root); |
| 560 | } |
| 561 | |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 562 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
| 563 | struct btrfs_root *root) |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 564 | { |
| 565 | struct inode *inode; |
| 566 | struct btrfs_iget_args args; |
| 567 | args.ino = objectid; |
| 568 | args.root = root; |
| 569 | |
| 570 | inode = iget5_locked(s, objectid, btrfs_find_actor, |
| 571 | btrfs_init_locked_inode, |
| 572 | (void *)&args); |
| 573 | return inode; |
| 574 | } |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 575 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 576 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
| 577 | struct nameidata *nd) |
| 578 | { |
| 579 | struct inode * inode; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 580 | struct btrfs_inode *bi = BTRFS_I(dir); |
| 581 | struct btrfs_root *root = bi->root; |
| 582 | struct btrfs_root *sub_root = root; |
| 583 | struct btrfs_key location; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 584 | int ret; |
| 585 | |
| 586 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 587 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 588 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 589 | ret = btrfs_inode_by_name(dir, dentry, &location); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 590 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 591 | if (ret < 0) |
| 592 | return ERR_PTR(ret); |
| 593 | inode = NULL; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 594 | if (location.objectid) { |
| 595 | ret = fixup_tree_root_location(root, &location, &sub_root); |
| 596 | if (ret < 0) |
| 597 | return ERR_PTR(ret); |
| 598 | if (ret > 0) |
| 599 | return ERR_PTR(-ENOENT); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 600 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
| 601 | sub_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 602 | if (!inode) |
| 603 | return ERR_PTR(-EACCES); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 604 | if (inode->i_state & I_NEW) { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 605 | if (sub_root != root) { |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 606 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 607 | igrab(inode); |
| 608 | sub_root->inode = inode; |
| 609 | } |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 610 | BTRFS_I(inode)->root = sub_root; |
| 611 | memcpy(&BTRFS_I(inode)->location, &location, |
| 612 | sizeof(location)); |
| 613 | btrfs_read_locked_inode(inode); |
| 614 | unlock_new_inode(inode); |
| 615 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 616 | } |
| 617 | return d_splice_alias(inode, dentry); |
| 618 | } |
| 619 | |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 620 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
| 621 | u64 objectid) |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 622 | { |
| 623 | struct btrfs_node *node; |
| 624 | int i; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 625 | u32 nritems; |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 626 | u64 item_objectid; |
| 627 | u64 blocknr; |
| 628 | int slot; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 629 | int ret; |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 630 | |
| 631 | if (!path->nodes[1]) |
| 632 | return; |
| 633 | node = btrfs_buffer_node(path->nodes[1]); |
| 634 | slot = path->slots[1]; |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 635 | nritems = btrfs_header_nritems(&node->header); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 636 | for (i = slot + 1; i < nritems; i++) { |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 637 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
| 638 | if (item_objectid != objectid) |
| 639 | break; |
| 640 | blocknr = btrfs_node_blockptr(node, i); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 641 | ret = readahead_tree_block(root, blocknr); |
| 642 | if (ret) |
| 643 | break; |
Chris Mason | 090d187 | 2007-05-01 08:53:32 -0400 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 647 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 648 | { |
| 649 | struct inode *inode = filp->f_path.dentry->d_inode; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 650 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 651 | struct btrfs_item *item; |
| 652 | struct btrfs_dir_item *di; |
| 653 | struct btrfs_key key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 654 | struct btrfs_path *path; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 655 | int ret; |
| 656 | u32 nritems; |
| 657 | struct btrfs_leaf *leaf; |
| 658 | int slot; |
| 659 | int advance; |
| 660 | unsigned char d_type = DT_UNKNOWN; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 661 | int over = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 662 | u32 di_cur; |
| 663 | u32 di_total; |
| 664 | u32 di_len; |
| 665 | int key_type = BTRFS_DIR_INDEX_KEY; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 666 | |
| 667 | /* FIXME, use a real flag for deciding about the key type */ |
| 668 | if (root->fs_info->tree_root == root) |
| 669 | key_type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 670 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 671 | key.objectid = inode->i_ino; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 672 | key.flags = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 673 | btrfs_set_key_type(&key, key_type); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 674 | key.offset = filp->f_pos; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 675 | path = btrfs_alloc_path(); |
| 676 | btrfs_init_path(path); |
| 677 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | 1b05da2 | 2007-04-10 12:13:09 -0400 | [diff] [blame] | 678 | if (ret < 0) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 679 | goto err; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 680 | advance = 0; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 681 | reada_leaves(root, path, inode->i_ino); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 682 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 683 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 684 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 685 | slot = path->slots[0]; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 686 | if (advance || slot >= nritems) { |
| 687 | if (slot >= nritems -1) { |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 688 | reada_leaves(root, path, inode->i_ino); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 689 | ret = btrfs_next_leaf(root, path); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 690 | if (ret) |
| 691 | break; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 692 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 693 | nritems = btrfs_header_nritems(&leaf->header); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 694 | slot = path->slots[0]; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 695 | } else { |
| 696 | slot++; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 697 | path->slots[0]++; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 698 | } |
| 699 | } |
| 700 | advance = 1; |
| 701 | item = leaf->items + slot; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 702 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
| 703 | break; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 704 | if (btrfs_disk_key_type(&item->key) != key_type) |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 705 | break; |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 706 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
| 707 | continue; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 708 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 709 | advance = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 710 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 711 | di_cur = 0; |
| 712 | di_total = btrfs_item_size(leaf->items + slot); |
| 713 | while(di_cur < di_total) { |
| 714 | over = filldir(dirent, (const char *)(di + 1), |
| 715 | btrfs_dir_name_len(di), |
| 716 | btrfs_disk_key_offset(&item->key), |
| 717 | btrfs_disk_key_objectid(&di->location), |
| 718 | d_type); |
| 719 | if (over) |
| 720 | goto nopos; |
| 721 | di_len = btrfs_dir_name_len(di) + sizeof(*di); |
| 722 | di_cur += di_len; |
| 723 | di = (struct btrfs_dir_item *)((char *)di + di_len); |
| 724 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 725 | } |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 726 | filp->f_pos++; |
| 727 | nopos: |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 728 | ret = 0; |
| 729 | err: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 730 | btrfs_release_path(root, path); |
| 731 | btrfs_free_path(path); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 732 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 733 | return ret; |
| 734 | } |
| 735 | |
| 736 | static void btrfs_put_super (struct super_block * sb) |
| 737 | { |
| 738 | struct btrfs_root *root = btrfs_sb(sb); |
| 739 | int ret; |
| 740 | |
| 741 | ret = close_ctree(root); |
| 742 | if (ret) { |
| 743 | printk("close ctree returns %d\n", ret); |
| 744 | } |
| 745 | sb->s_fs_info = NULL; |
| 746 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 747 | |
| 748 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
| 749 | { |
| 750 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 751 | struct dentry * root_dentry; |
| 752 | struct btrfs_super_block *disk_super; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 753 | struct btrfs_root *tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 754 | struct btrfs_inode *bi; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 755 | |
| 756 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 757 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 758 | sb->s_op = &btrfs_super_ops; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 759 | sb->s_time_gran = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 760 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 761 | tree_root = open_ctree(sb); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 762 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 763 | if (!tree_root) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 764 | printk("btrfs: open_ctree failed\n"); |
| 765 | return -EIO; |
| 766 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 767 | sb->s_fs_info = tree_root; |
| 768 | disk_super = tree_root->fs_info->disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 769 | printk("read in super total blocks %Lu root %Lu\n", |
| 770 | btrfs_super_total_blocks(disk_super), |
| 771 | btrfs_super_root_dir(disk_super)); |
| 772 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 773 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
| 774 | tree_root); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 775 | bi = BTRFS_I(inode); |
| 776 | bi->location.objectid = inode->i_ino; |
| 777 | bi->location.offset = 0; |
| 778 | bi->location.flags = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 779 | bi->root = tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 780 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
| 781 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 782 | if (!inode) |
| 783 | return -ENOMEM; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 784 | if (inode->i_state & I_NEW) { |
| 785 | btrfs_read_locked_inode(inode); |
| 786 | unlock_new_inode(inode); |
| 787 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 788 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 789 | root_dentry = d_alloc_root(inode); |
| 790 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 791 | iput(inode); |
| 792 | return -ENOMEM; |
| 793 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 794 | sb->s_root = root_dentry; |
| 795 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 796 | return 0; |
| 797 | } |
| 798 | |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 799 | static int btrfs_write_inode(struct inode *inode, int wait) |
| 800 | { |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 801 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 802 | struct btrfs_trans_handle *trans; |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 803 | int ret = 0; |
| 804 | |
| 805 | if (wait) { |
| 806 | mutex_lock(&root->fs_info->fs_mutex); |
| 807 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 808 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 809 | ret = btrfs_commit_transaction(trans, root); |
| 810 | mutex_unlock(&root->fs_info->fs_mutex); |
| 811 | } |
| 812 | return ret; |
| 813 | } |
| 814 | |
| 815 | static void btrfs_dirty_inode(struct inode *inode) |
| 816 | { |
| 817 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 818 | struct btrfs_trans_handle *trans; |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 819 | |
| 820 | mutex_lock(&root->fs_info->fs_mutex); |
| 821 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 822 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 823 | btrfs_update_inode(trans, root, inode); |
| 824 | btrfs_end_transaction(trans, root); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 825 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 826 | btrfs_btree_balance_dirty(root); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 827 | } |
| 828 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 829 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 830 | struct btrfs_root *root, |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 831 | u64 objectid, |
| 832 | struct btrfs_block_group_cache *group, |
| 833 | int mode) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 834 | { |
| 835 | struct inode *inode; |
| 836 | struct btrfs_inode_item inode_item; |
Chris Mason | 1b05da2 | 2007-04-10 12:13:09 -0400 | [diff] [blame] | 837 | struct btrfs_key *location; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 838 | int ret; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 839 | int owner; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 840 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 841 | inode = new_inode(root->fs_info->sb); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 842 | if (!inode) |
| 843 | return ERR_PTR(-ENOMEM); |
| 844 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 845 | BTRFS_I(inode)->root = root; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 846 | if (mode & S_IFDIR) |
| 847 | owner = 0; |
| 848 | else |
| 849 | owner = 1; |
| 850 | group = btrfs_find_block_group(root, group, 0, 0, owner); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 851 | BTRFS_I(inode)->block_group = group; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 852 | |
| 853 | inode->i_uid = current->fsuid; |
| 854 | inode->i_gid = current->fsgid; |
| 855 | inode->i_mode = mode; |
| 856 | inode->i_ino = objectid; |
| 857 | inode->i_blocks = 0; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 858 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 859 | fill_inode_item(&inode_item, inode); |
Chris Mason | 1b05da2 | 2007-04-10 12:13:09 -0400 | [diff] [blame] | 860 | location = &BTRFS_I(inode)->location; |
| 861 | location->objectid = objectid; |
| 862 | location->flags = 0; |
| 863 | location->offset = 0; |
| 864 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 865 | |
| 866 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); |
| 867 | BUG_ON(ret); |
| 868 | |
| 869 | insert_inode_hash(inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 870 | return inode; |
| 871 | } |
| 872 | |
| 873 | static int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 874 | struct dentry *dentry, struct inode *inode) |
| 875 | { |
| 876 | int ret; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 877 | struct btrfs_key key; |
| 878 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; |
| 879 | key.objectid = inode->i_ino; |
| 880 | key.flags = 0; |
| 881 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 882 | key.offset = 0; |
| 883 | |
| 884 | ret = btrfs_insert_dir_item(trans, root, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 885 | dentry->d_name.name, dentry->d_name.len, |
| 886 | dentry->d_parent->d_inode->i_ino, |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 887 | &key, 0); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 888 | if (ret == 0) { |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame] | 889 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 890 | ret = btrfs_update_inode(trans, root, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 891 | dentry->d_parent->d_inode); |
| 892 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 893 | return ret; |
| 894 | } |
| 895 | |
| 896 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
| 897 | struct dentry *dentry, struct inode *inode) |
| 898 | { |
| 899 | int err = btrfs_add_link(trans, dentry, inode); |
| 900 | if (!err) { |
| 901 | d_instantiate(dentry, inode); |
| 902 | return 0; |
| 903 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 904 | if (err > 0) |
| 905 | err = -EEXIST; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 906 | return err; |
| 907 | } |
| 908 | |
| 909 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
| 910 | int mode, struct nameidata *nd) |
| 911 | { |
| 912 | struct btrfs_trans_handle *trans; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 913 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 914 | struct inode *inode; |
| 915 | int err; |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 916 | int drop_inode = 0; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 917 | u64 objectid; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 918 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 919 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 920 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 921 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 922 | |
| 923 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 924 | if (err) { |
| 925 | err = -ENOSPC; |
| 926 | goto out_unlock; |
| 927 | } |
| 928 | |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 929 | inode = btrfs_new_inode(trans, root, objectid, |
| 930 | BTRFS_I(dir)->block_group, mode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 931 | err = PTR_ERR(inode); |
| 932 | if (IS_ERR(inode)) |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 933 | goto out_unlock; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 934 | |
| 935 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 936 | err = btrfs_add_nondir(trans, dentry, inode); |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 937 | if (err) |
| 938 | drop_inode = 1; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 939 | else { |
| 940 | inode->i_mapping->a_ops = &btrfs_aops; |
| 941 | inode->i_fop = &btrfs_file_operations; |
| 942 | inode->i_op = &btrfs_file_inode_operations; |
| 943 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 944 | dir->i_sb->s_dirt = 1; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 945 | btrfs_update_inode_block_group(trans, inode); |
| 946 | btrfs_update_inode_block_group(trans, dir); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 947 | out_unlock: |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 948 | btrfs_end_transaction(trans, root); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 949 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 950 | |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 951 | if (drop_inode) { |
| 952 | inode_dec_link_count(inode); |
| 953 | iput(inode); |
| 954 | } |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 955 | btrfs_btree_balance_dirty(root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 956 | return err; |
| 957 | } |
| 958 | |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 959 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 960 | struct btrfs_root *root, |
| 961 | u64 objectid, u64 dirid) |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 962 | { |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 963 | int ret; |
| 964 | char buf[2]; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 965 | struct btrfs_key key; |
| 966 | |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 967 | buf[0] = '.'; |
| 968 | buf[1] = '.'; |
| 969 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 970 | key.objectid = objectid; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 971 | key.offset = 0; |
| 972 | key.flags = 0; |
| 973 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 974 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 975 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 976 | &key, 1); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 977 | if (ret) |
| 978 | goto error; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 979 | key.objectid = dirid; |
| 980 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 981 | &key, 1); |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 982 | if (ret) |
| 983 | goto error; |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 984 | error: |
| 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 989 | { |
| 990 | struct inode *inode; |
| 991 | struct btrfs_trans_handle *trans; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 992 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 993 | int err = 0; |
| 994 | int drop_on_err = 0; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 995 | u64 objectid; |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 996 | |
| 997 | mutex_lock(&root->fs_info->fs_mutex); |
| 998 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 999 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1000 | if (IS_ERR(trans)) { |
| 1001 | err = PTR_ERR(trans); |
| 1002 | goto out_unlock; |
| 1003 | } |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 1004 | |
| 1005 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 1006 | if (err) { |
| 1007 | err = -ENOSPC; |
| 1008 | goto out_unlock; |
| 1009 | } |
| 1010 | |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1011 | inode = btrfs_new_inode(trans, root, objectid, |
| 1012 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1013 | if (IS_ERR(inode)) { |
| 1014 | err = PTR_ERR(inode); |
| 1015 | goto out_fail; |
| 1016 | } |
| 1017 | drop_on_err = 1; |
| 1018 | inode->i_op = &btrfs_dir_inode_operations; |
| 1019 | inode->i_fop = &btrfs_dir_file_operations; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1020 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1021 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 1022 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
| 1023 | if (err) |
| 1024 | goto out_fail; |
| 1025 | |
| 1026 | inode->i_size = 6; |
| 1027 | err = btrfs_update_inode(trans, root, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1028 | if (err) |
| 1029 | goto out_fail; |
| 1030 | err = btrfs_add_link(trans, dentry, inode); |
| 1031 | if (err) |
| 1032 | goto out_fail; |
| 1033 | d_instantiate(dentry, inode); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1034 | drop_on_err = 0; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1035 | dir->i_sb->s_dirt = 1; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1036 | btrfs_update_inode_block_group(trans, inode); |
| 1037 | btrfs_update_inode_block_group(trans, dir); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1038 | |
| 1039 | out_fail: |
| 1040 | btrfs_end_transaction(trans, root); |
| 1041 | out_unlock: |
| 1042 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1043 | if (drop_on_err) |
| 1044 | iput(inode); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1045 | btrfs_btree_balance_dirty(root); |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 1046 | return err; |
| 1047 | } |
| 1048 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1049 | static int btrfs_sync_file(struct file *file, |
| 1050 | struct dentry *dentry, int datasync) |
| 1051 | { |
| 1052 | struct inode *inode = dentry->d_inode; |
| 1053 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1054 | int ret; |
| 1055 | struct btrfs_trans_handle *trans; |
| 1056 | |
| 1057 | mutex_lock(&root->fs_info->fs_mutex); |
| 1058 | trans = btrfs_start_transaction(root, 1); |
| 1059 | if (!trans) { |
| 1060 | ret = -ENOMEM; |
| 1061 | goto out; |
| 1062 | } |
| 1063 | ret = btrfs_commit_transaction(trans, root); |
| 1064 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1065 | out: |
| 1066 | return ret > 0 ? EIO : ret; |
| 1067 | } |
| 1068 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1069 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
| 1070 | { |
| 1071 | struct btrfs_trans_handle *trans; |
| 1072 | struct btrfs_root *root; |
| 1073 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 1074 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 1075 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1076 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1077 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 1078 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1079 | return 0; |
| 1080 | } |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1081 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1082 | trans = btrfs_start_transaction(root, 1); |
| 1083 | ret = btrfs_commit_transaction(trans, root); |
| 1084 | sb->s_dirt = 0; |
| 1085 | BUG_ON(ret); |
| 1086 | printk("btrfs sync_fs\n"); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1087 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1088 | return 0; |
| 1089 | } |
| 1090 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1091 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1092 | struct buffer_head *result, int create) |
| 1093 | { |
| 1094 | int ret; |
| 1095 | int err = 0; |
| 1096 | u64 blocknr; |
| 1097 | u64 extent_start = 0; |
| 1098 | u64 extent_end = 0; |
| 1099 | u64 objectid = inode->i_ino; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1100 | u32 found_type; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1101 | struct btrfs_path *path; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 1102 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1103 | struct btrfs_file_extent_item *item; |
| 1104 | struct btrfs_leaf *leaf; |
| 1105 | struct btrfs_disk_key *found_key; |
| 1106 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1107 | path = btrfs_alloc_path(); |
| 1108 | BUG_ON(!path); |
| 1109 | btrfs_init_path(path); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1110 | if (create) { |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1111 | WARN_ON(1); |
| 1112 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1113 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1114 | ret = btrfs_lookup_file_extent(NULL, root, path, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 1115 | inode->i_ino, |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1116 | iblock << inode->i_blkbits, 0); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1117 | if (ret < 0) { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1118 | err = ret; |
| 1119 | goto out; |
| 1120 | } |
| 1121 | |
| 1122 | if (ret != 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1123 | if (path->slots[0] == 0) { |
| 1124 | btrfs_release_path(root, path); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1125 | goto out; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1126 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1127 | path->slots[0]--; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1128 | } |
| 1129 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1130 | 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] | 1131 | struct btrfs_file_extent_item); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1132 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1133 | blocknr = btrfs_file_extent_disk_blocknr(item); |
| 1134 | blocknr += btrfs_file_extent_offset(item); |
| 1135 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1136 | /* are we inside the extent that was found? */ |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1137 | found_key = &leaf->items[path->slots[0]].key; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1138 | found_type = btrfs_disk_key_type(found_key); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1139 | if (btrfs_disk_key_objectid(found_key) != objectid || |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1140 | found_type != BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1141 | extent_end = 0; |
| 1142 | extent_start = 0; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1143 | goto out; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1144 | } |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1145 | found_type = btrfs_file_extent_type(item); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1146 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1147 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
| 1148 | extent_start = extent_start >> inode->i_blkbits; |
| 1149 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); |
| 1150 | if (iblock >= extent_start && iblock < extent_end) { |
| 1151 | err = 0; |
| 1152 | btrfs_map_bh_to_logical(root, result, blocknr + |
| 1153 | iblock - extent_start); |
| 1154 | goto out; |
| 1155 | } |
| 1156 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 1157 | char *ptr; |
| 1158 | char *map; |
| 1159 | u32 size; |
| 1160 | size = btrfs_file_extent_inline_len(leaf->items + |
| 1161 | path->slots[0]); |
| 1162 | extent_end = (extent_start + size) >> inode->i_blkbits; |
| 1163 | extent_start >>= inode->i_blkbits; |
| 1164 | if (iblock < extent_start || iblock > extent_end) { |
| 1165 | goto out; |
| 1166 | } |
| 1167 | ptr = btrfs_file_extent_inline_start(item); |
| 1168 | map = kmap(result->b_page); |
| 1169 | memcpy(map, ptr, size); |
| 1170 | memset(map + size, 0, PAGE_CACHE_SIZE - size); |
| 1171 | flush_dcache_page(result->b_page); |
| 1172 | kunmap(result->b_page); |
| 1173 | set_buffer_uptodate(result); |
| 1174 | SetPageChecked(result->b_page); |
| 1175 | btrfs_map_bh_to_logical(root, result, 0); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1176 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1177 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1178 | btrfs_free_path(path); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1179 | return err; |
| 1180 | } |
| 1181 | |
| 1182 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
| 1183 | struct buffer_head *result, int create) |
| 1184 | { |
| 1185 | int err; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 1186 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1187 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1188 | err = btrfs_get_block_lock(inode, iblock, result, create); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1189 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1190 | return err; |
| 1191 | } |
| 1192 | |
| 1193 | static int btrfs_prepare_write(struct file *file, struct page *page, |
| 1194 | unsigned from, unsigned to) |
| 1195 | { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1196 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1197 | } |
| 1198 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1199 | static void btrfs_write_super(struct super_block *sb) |
| 1200 | { |
| 1201 | btrfs_sync_fs(sb, 1); |
| 1202 | } |
| 1203 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1204 | static int btrfs_readpage(struct file *file, struct page *page) |
| 1205 | { |
| 1206 | return mpage_readpage(page, btrfs_get_block); |
| 1207 | } |
| 1208 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1209 | /* |
| 1210 | * While block_write_full_page is writing back the dirty buffers under |
| 1211 | * the page lock, whoever dirtied the buffers may decide to clean them |
| 1212 | * again at any time. We handle that by only looking at the buffer |
| 1213 | * state inside lock_buffer(). |
| 1214 | * |
| 1215 | * If block_write_full_page() is called for regular writeback |
| 1216 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a |
| 1217 | * locked buffer. This only can happen if someone has written the buffer |
| 1218 | * directly, with submit_bh(). At the address_space level PageWriteback |
| 1219 | * prevents this contention from occurring. |
| 1220 | */ |
| 1221 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, |
| 1222 | struct writeback_control *wbc) |
| 1223 | { |
| 1224 | int err; |
| 1225 | sector_t block; |
| 1226 | sector_t last_block; |
| 1227 | struct buffer_head *bh, *head; |
| 1228 | const unsigned blocksize = 1 << inode->i_blkbits; |
| 1229 | int nr_underway = 0; |
| 1230 | |
| 1231 | BUG_ON(!PageLocked(page)); |
| 1232 | |
| 1233 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; |
| 1234 | |
| 1235 | if (!page_has_buffers(page)) { |
| 1236 | create_empty_buffers(page, blocksize, |
| 1237 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 1238 | } |
| 1239 | |
| 1240 | /* |
| 1241 | * Be very careful. We have no exclusion from __set_page_dirty_buffers |
| 1242 | * here, and the (potentially unmapped) buffers may become dirty at |
| 1243 | * any time. If a buffer becomes dirty here after we've inspected it |
| 1244 | * then we just miss that fact, and the page stays dirty. |
| 1245 | * |
| 1246 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; |
| 1247 | * handle that here by just cleaning them. |
| 1248 | */ |
| 1249 | |
| 1250 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); |
| 1251 | head = page_buffers(page); |
| 1252 | bh = head; |
| 1253 | |
| 1254 | /* |
| 1255 | * Get all the dirty buffers mapped to disk addresses and |
| 1256 | * handle any aliases from the underlying blockdev's mapping. |
| 1257 | */ |
| 1258 | do { |
| 1259 | if (block > last_block) { |
| 1260 | /* |
| 1261 | * mapped buffers outside i_size will occur, because |
| 1262 | * this page can be outside i_size when there is a |
| 1263 | * truncate in progress. |
| 1264 | */ |
| 1265 | /* |
| 1266 | * The buffer was zeroed by block_write_full_page() |
| 1267 | */ |
| 1268 | clear_buffer_dirty(bh); |
| 1269 | set_buffer_uptodate(bh); |
| 1270 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { |
| 1271 | WARN_ON(bh->b_size != blocksize); |
| 1272 | err = btrfs_get_block(inode, block, bh, 0); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1273 | if (err) { |
| 1274 | printk("writepage going to recovery err %d\n", err); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1275 | goto recover; |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1276 | } |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1277 | if (buffer_new(bh)) { |
| 1278 | /* blockdev mappings never come here */ |
| 1279 | clear_buffer_new(bh); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1280 | } |
| 1281 | } |
| 1282 | bh = bh->b_this_page; |
| 1283 | block++; |
| 1284 | } while (bh != head); |
| 1285 | |
| 1286 | do { |
| 1287 | if (!buffer_mapped(bh)) |
| 1288 | continue; |
| 1289 | /* |
| 1290 | * If it's a fully non-blocking write attempt and we cannot |
| 1291 | * lock the buffer then redirty the page. Note that this can |
| 1292 | * potentially cause a busy-wait loop from pdflush and kswapd |
| 1293 | * activity, but those code paths have their own higher-level |
| 1294 | * throttling. |
| 1295 | */ |
| 1296 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { |
| 1297 | lock_buffer(bh); |
| 1298 | } else if (test_set_buffer_locked(bh)) { |
| 1299 | redirty_page_for_writepage(wbc, page); |
| 1300 | continue; |
| 1301 | } |
| 1302 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { |
| 1303 | mark_buffer_async_write(bh); |
| 1304 | } else { |
| 1305 | unlock_buffer(bh); |
| 1306 | } |
| 1307 | } while ((bh = bh->b_this_page) != head); |
| 1308 | |
| 1309 | /* |
| 1310 | * The page and its buffers are protected by PageWriteback(), so we can |
| 1311 | * drop the bh refcounts early. |
| 1312 | */ |
| 1313 | BUG_ON(PageWriteback(page)); |
| 1314 | set_page_writeback(page); |
| 1315 | |
| 1316 | do { |
| 1317 | struct buffer_head *next = bh->b_this_page; |
| 1318 | if (buffer_async_write(bh)) { |
| 1319 | submit_bh(WRITE, bh); |
| 1320 | nr_underway++; |
| 1321 | } |
| 1322 | bh = next; |
| 1323 | } while (bh != head); |
| 1324 | unlock_page(page); |
| 1325 | |
| 1326 | err = 0; |
| 1327 | done: |
| 1328 | if (nr_underway == 0) { |
| 1329 | /* |
| 1330 | * The page was marked dirty, but the buffers were |
| 1331 | * clean. Someone wrote them back by hand with |
| 1332 | * ll_rw_block/submit_bh. A rare case. |
| 1333 | */ |
| 1334 | int uptodate = 1; |
| 1335 | do { |
| 1336 | if (!buffer_uptodate(bh)) { |
| 1337 | uptodate = 0; |
| 1338 | break; |
| 1339 | } |
| 1340 | bh = bh->b_this_page; |
| 1341 | } while (bh != head); |
| 1342 | if (uptodate) |
| 1343 | SetPageUptodate(page); |
| 1344 | end_page_writeback(page); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1345 | } |
| 1346 | return err; |
| 1347 | |
| 1348 | recover: |
| 1349 | /* |
| 1350 | * ENOSPC, or some other error. We may already have added some |
| 1351 | * blocks to the file, so we need to write these out to avoid |
| 1352 | * exposing stale data. |
| 1353 | * The page is currently locked and not marked for writeback |
| 1354 | */ |
| 1355 | bh = head; |
| 1356 | /* Recovery: lock and submit the mapped buffers */ |
| 1357 | do { |
| 1358 | if (buffer_mapped(bh) && buffer_dirty(bh)) { |
| 1359 | lock_buffer(bh); |
| 1360 | mark_buffer_async_write(bh); |
| 1361 | } else { |
| 1362 | /* |
| 1363 | * The buffer may have been set dirty during |
| 1364 | * attachment to a dirty page. |
| 1365 | */ |
| 1366 | clear_buffer_dirty(bh); |
| 1367 | } |
| 1368 | } while ((bh = bh->b_this_page) != head); |
| 1369 | SetPageError(page); |
| 1370 | BUG_ON(PageWriteback(page)); |
| 1371 | set_page_writeback(page); |
| 1372 | do { |
| 1373 | struct buffer_head *next = bh->b_this_page; |
| 1374 | if (buffer_async_write(bh)) { |
| 1375 | clear_buffer_dirty(bh); |
| 1376 | submit_bh(WRITE, bh); |
| 1377 | nr_underway++; |
| 1378 | } |
| 1379 | bh = next; |
| 1380 | } while (bh != head); |
| 1381 | unlock_page(page); |
| 1382 | goto done; |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | * The generic ->writepage function for buffer-backed address_spaces |
| 1387 | */ |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1388 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 1389 | { |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1390 | struct inode * const inode = page->mapping->host; |
| 1391 | loff_t i_size = i_size_read(inode); |
| 1392 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 1393 | unsigned offset; |
| 1394 | void *kaddr; |
| 1395 | |
| 1396 | /* Is the page fully inside i_size? */ |
| 1397 | if (page->index < end_index) |
| 1398 | return __btrfs_write_full_page(inode, page, wbc); |
| 1399 | |
| 1400 | /* Is the page fully outside i_size? (truncate in progress) */ |
| 1401 | offset = i_size & (PAGE_CACHE_SIZE-1); |
| 1402 | if (page->index >= end_index+1 || !offset) { |
| 1403 | /* |
| 1404 | * The page may have dirty, unmapped buffers. For example, |
| 1405 | * they may have been added in ext3_writepage(). Make them |
| 1406 | * freeable here, so the page does not leak. |
| 1407 | */ |
| 1408 | block_invalidatepage(page, 0); |
| 1409 | unlock_page(page); |
| 1410 | return 0; /* don't care */ |
| 1411 | } |
| 1412 | |
| 1413 | /* |
| 1414 | * The page straddles i_size. It must be zeroed out on each and every |
| 1415 | * writepage invokation because it may be mmapped. "A file is mapped |
| 1416 | * in multiples of the page size. For a file that is not a multiple of |
| 1417 | * the page size, the remaining memory is zeroed when mapped, and |
| 1418 | * writes to that region are not written out to the file." |
| 1419 | */ |
| 1420 | kaddr = kmap_atomic(page, KM_USER0); |
| 1421 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); |
| 1422 | flush_dcache_page(page); |
| 1423 | kunmap_atomic(kaddr, KM_USER0); |
| 1424 | return __btrfs_write_full_page(inode, page, wbc); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 1425 | } |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1426 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1427 | static void btrfs_truncate(struct inode *inode) |
| 1428 | { |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 1429 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1430 | int ret; |
| 1431 | struct btrfs_trans_handle *trans; |
| 1432 | |
| 1433 | if (!S_ISREG(inode->i_mode)) |
| 1434 | return; |
| 1435 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 1436 | return; |
| 1437 | |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 1438 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1439 | |
| 1440 | /* FIXME, add redo link to tree so we don't leak on crash */ |
| 1441 | mutex_lock(&root->fs_info->fs_mutex); |
| 1442 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1443 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1444 | ret = btrfs_truncate_in_trans(trans, root, inode); |
| 1445 | BUG_ON(ret); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1446 | btrfs_update_inode(trans, root, inode); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1447 | ret = btrfs_end_transaction(trans, root); |
| 1448 | BUG_ON(ret); |
| 1449 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1450 | btrfs_btree_balance_dirty(root); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1451 | } |
| 1452 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1453 | /* |
| 1454 | * Make sure any changes to nobh_commit_write() are reflected in |
| 1455 | * nobh_truncate_page(), since it doesn't call commit_write(). |
| 1456 | */ |
| 1457 | static int btrfs_commit_write(struct file *file, struct page *page, |
| 1458 | unsigned from, unsigned to) |
| 1459 | { |
| 1460 | struct inode *inode = page->mapping->host; |
| 1461 | struct buffer_head *bh; |
| 1462 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
| 1463 | |
| 1464 | SetPageUptodate(page); |
| 1465 | bh = page_buffers(page); |
| 1466 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
| 1467 | set_page_dirty(page); |
| 1468 | } |
| 1469 | if (pos > inode->i_size) { |
| 1470 | i_size_write(inode, pos); |
| 1471 | mark_inode_dirty(inode); |
| 1472 | } |
| 1473 | return 0; |
| 1474 | } |
| 1475 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1476 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
| 1477 | struct page **prepared_pages, |
| 1478 | const char __user * buf) |
| 1479 | { |
| 1480 | long page_fault = 0; |
| 1481 | int i; |
| 1482 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1483 | |
| 1484 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { |
| 1485 | size_t count = min_t(size_t, |
| 1486 | PAGE_CACHE_SIZE - offset, write_bytes); |
| 1487 | struct page *page = prepared_pages[i]; |
| 1488 | fault_in_pages_readable(buf, count); |
| 1489 | |
| 1490 | /* Copy data from userspace to the current page */ |
| 1491 | kmap(page); |
| 1492 | page_fault = __copy_from_user(page_address(page) + offset, |
| 1493 | buf, count); |
| 1494 | /* Flush processor's dcache for this page */ |
| 1495 | flush_dcache_page(page); |
| 1496 | kunmap(page); |
| 1497 | buf += count; |
| 1498 | write_bytes -= count; |
| 1499 | |
| 1500 | if (page_fault) |
| 1501 | break; |
| 1502 | } |
| 1503 | return page_fault ? -EFAULT : 0; |
| 1504 | } |
| 1505 | |
| 1506 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
| 1507 | { |
| 1508 | size_t i; |
| 1509 | for (i = 0; i < num_pages; i++) { |
| 1510 | if (!pages[i]) |
| 1511 | break; |
| 1512 | unlock_page(pages[i]); |
| 1513 | mark_page_accessed(pages[i]); |
| 1514 | page_cache_release(pages[i]); |
| 1515 | } |
| 1516 | } |
| 1517 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
| 1518 | struct btrfs_root *root, |
| 1519 | struct file *file, |
| 1520 | struct page **pages, |
| 1521 | size_t num_pages, |
| 1522 | loff_t pos, |
| 1523 | size_t write_bytes) |
| 1524 | { |
| 1525 | int i; |
| 1526 | int offset; |
| 1527 | int err = 0; |
| 1528 | int ret; |
| 1529 | int this_write; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1530 | struct inode *inode = file->f_path.dentry->d_inode; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1531 | struct buffer_head *bh; |
| 1532 | struct btrfs_file_extent_item *ei; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1533 | |
| 1534 | for (i = 0; i < num_pages; i++) { |
| 1535 | offset = pos & (PAGE_CACHE_SIZE -1); |
| 1536 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1537 | /* FIXME, one block at a time */ |
| 1538 | |
| 1539 | mutex_lock(&root->fs_info->fs_mutex); |
| 1540 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1541 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1542 | |
| 1543 | bh = page_buffers(pages[i]); |
| 1544 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { |
| 1545 | struct btrfs_key key; |
| 1546 | struct btrfs_path *path; |
| 1547 | char *ptr; |
| 1548 | u32 datasize; |
| 1549 | |
| 1550 | path = btrfs_alloc_path(); |
| 1551 | BUG_ON(!path); |
| 1552 | key.objectid = inode->i_ino; |
| 1553 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; |
| 1554 | key.flags = 0; |
| 1555 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
| 1556 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); |
| 1557 | datasize = offset + |
| 1558 | btrfs_file_extent_calc_inline_size(write_bytes); |
| 1559 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 1560 | datasize); |
| 1561 | BUG_ON(ret); |
| 1562 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 1563 | path->slots[0], struct btrfs_file_extent_item); |
| 1564 | btrfs_set_file_extent_generation(ei, trans->transid); |
| 1565 | btrfs_set_file_extent_type(ei, |
| 1566 | BTRFS_FILE_EXTENT_INLINE); |
| 1567 | ptr = btrfs_file_extent_inline_start(ei); |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1568 | btrfs_memcpy(root, path->nodes[0]->b_data, |
| 1569 | ptr, bh->b_data, offset + write_bytes); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1570 | mark_buffer_dirty(path->nodes[0]); |
| 1571 | btrfs_free_path(path); |
| 1572 | } else { |
| 1573 | btrfs_csum_file_block(trans, root, inode->i_ino, |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1574 | pages[i]->index << PAGE_CACHE_SHIFT, |
| 1575 | kmap(pages[i]), PAGE_CACHE_SIZE); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1576 | kunmap(pages[i]); |
| 1577 | } |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1578 | SetPageChecked(pages[i]); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 1579 | // btrfs_update_inode_block_group(trans, inode); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1580 | ret = btrfs_end_transaction(trans, root); |
| 1581 | BUG_ON(ret); |
| 1582 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1583 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1584 | ret = btrfs_commit_write(file, pages[i], offset, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1585 | offset + this_write); |
| 1586 | pos += this_write; |
| 1587 | if (ret) { |
| 1588 | err = ret; |
| 1589 | goto failed; |
| 1590 | } |
| 1591 | WARN_ON(this_write > write_bytes); |
| 1592 | write_bytes -= this_write; |
| 1593 | } |
| 1594 | failed: |
| 1595 | return err; |
| 1596 | } |
| 1597 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1598 | static int drop_extents(struct btrfs_trans_handle *trans, |
| 1599 | struct btrfs_root *root, |
| 1600 | struct inode *inode, |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1601 | u64 start, u64 end, u64 *hint_block) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1602 | { |
| 1603 | int ret; |
| 1604 | struct btrfs_key key; |
| 1605 | struct btrfs_leaf *leaf; |
| 1606 | int slot; |
| 1607 | struct btrfs_file_extent_item *extent; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1608 | u64 extent_end = 0; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1609 | int keep; |
| 1610 | struct btrfs_file_extent_item old; |
| 1611 | struct btrfs_path *path; |
| 1612 | u64 search_start = start; |
| 1613 | int bookend; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1614 | int found_type; |
| 1615 | int found_extent; |
| 1616 | int found_inline; |
| 1617 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1618 | path = btrfs_alloc_path(); |
| 1619 | if (!path) |
| 1620 | return -ENOMEM; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1621 | while(1) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1622 | btrfs_release_path(root, path); |
| 1623 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, |
| 1624 | search_start, -1); |
| 1625 | if (ret < 0) |
| 1626 | goto out; |
| 1627 | if (ret > 0) { |
| 1628 | if (path->slots[0] == 0) { |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1629 | ret = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1630 | goto out; |
| 1631 | } |
| 1632 | path->slots[0]--; |
| 1633 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1634 | keep = 0; |
| 1635 | bookend = 0; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1636 | found_extent = 0; |
| 1637 | found_inline = 0; |
| 1638 | extent = NULL; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1639 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 1640 | slot = path->slots[0]; |
| 1641 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1642 | if (key.offset >= end || key.objectid != inode->i_ino) { |
| 1643 | ret = 0; |
| 1644 | goto out; |
| 1645 | } |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1646 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
| 1647 | ret = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1648 | goto out; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1649 | } |
| 1650 | extent = btrfs_item_ptr(leaf, slot, |
| 1651 | struct btrfs_file_extent_item); |
| 1652 | found_type = btrfs_file_extent_type(extent); |
| 1653 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
| 1654 | extent_end = key.offset + |
| 1655 | (btrfs_file_extent_num_blocks(extent) << |
| 1656 | inode->i_blkbits); |
| 1657 | found_extent = 1; |
| 1658 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 1659 | found_inline = 1; |
| 1660 | extent_end = key.offset + |
| 1661 | btrfs_file_extent_inline_len(leaf->items + slot); |
| 1662 | } |
| 1663 | |
| 1664 | if (!found_extent && !found_inline) { |
| 1665 | ret = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1666 | goto out; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1667 | } |
| 1668 | |
| 1669 | if (search_start >= extent_end) { |
| 1670 | ret = 0; |
| 1671 | goto out; |
| 1672 | } |
| 1673 | |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1674 | search_start = extent_end; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1675 | |
| 1676 | if (end < extent_end && end >= key.offset) { |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1677 | if (found_extent) { |
| 1678 | memcpy(&old, extent, sizeof(old)); |
| 1679 | ret = btrfs_inc_extent_ref(trans, root, |
| 1680 | btrfs_file_extent_disk_blocknr(&old), |
| 1681 | btrfs_file_extent_disk_num_blocks(&old)); |
| 1682 | BUG_ON(ret); |
| 1683 | } |
| 1684 | WARN_ON(found_inline); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1685 | bookend = 1; |
| 1686 | } |
| 1687 | |
| 1688 | if (start > key.offset) { |
| 1689 | u64 new_num; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1690 | u64 old_num; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1691 | /* truncate existing extent */ |
| 1692 | keep = 1; |
| 1693 | WARN_ON(start & (root->blocksize - 1)); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1694 | if (found_extent) { |
| 1695 | new_num = (start - key.offset) >> |
| 1696 | inode->i_blkbits; |
| 1697 | old_num = btrfs_file_extent_num_blocks(extent); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1698 | *hint_block = |
| 1699 | btrfs_file_extent_disk_blocknr(extent); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1700 | inode->i_blocks -= (old_num - new_num) << 3; |
| 1701 | btrfs_set_file_extent_num_blocks(extent, |
| 1702 | new_num); |
| 1703 | mark_buffer_dirty(path->nodes[0]); |
| 1704 | } else { |
| 1705 | WARN_ON(1); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1706 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1707 | } |
| 1708 | if (!keep) { |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1709 | u64 disk_blocknr = 0; |
| 1710 | u64 disk_num_blocks = 0; |
| 1711 | u64 extent_num_blocks = 0; |
| 1712 | if (found_extent) { |
| 1713 | disk_blocknr = |
| 1714 | btrfs_file_extent_disk_blocknr(extent); |
| 1715 | disk_num_blocks = |
| 1716 | btrfs_file_extent_disk_num_blocks(extent); |
| 1717 | extent_num_blocks = |
| 1718 | btrfs_file_extent_num_blocks(extent); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1719 | *hint_block = |
| 1720 | btrfs_file_extent_disk_blocknr(extent); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1721 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1722 | ret = btrfs_del_item(trans, root, path); |
| 1723 | BUG_ON(ret); |
| 1724 | btrfs_release_path(root, path); |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1725 | extent = NULL; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1726 | if (found_extent) { |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1727 | inode->i_blocks -= extent_num_blocks << 3; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1728 | ret = btrfs_free_extent(trans, root, |
| 1729 | disk_blocknr, |
| 1730 | disk_num_blocks, 0); |
| 1731 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1732 | |
| 1733 | BUG_ON(ret); |
| 1734 | if (!bookend && search_start >= end) { |
| 1735 | ret = 0; |
| 1736 | goto out; |
| 1737 | } |
| 1738 | if (!bookend) |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1739 | continue; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1740 | } |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1741 | if (bookend && found_extent) { |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1742 | /* create bookend */ |
| 1743 | struct btrfs_key ins; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1744 | ins.objectid = inode->i_ino; |
| 1745 | ins.offset = end; |
| 1746 | ins.flags = 0; |
| 1747 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); |
| 1748 | |
| 1749 | btrfs_release_path(root, path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1750 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
| 1751 | sizeof(*extent)); |
| 1752 | BUG_ON(ret); |
| 1753 | extent = btrfs_item_ptr( |
| 1754 | btrfs_buffer_leaf(path->nodes[0]), |
| 1755 | path->slots[0], |
| 1756 | struct btrfs_file_extent_item); |
| 1757 | btrfs_set_file_extent_disk_blocknr(extent, |
| 1758 | btrfs_file_extent_disk_blocknr(&old)); |
| 1759 | btrfs_set_file_extent_disk_num_blocks(extent, |
| 1760 | btrfs_file_extent_disk_num_blocks(&old)); |
| 1761 | |
| 1762 | btrfs_set_file_extent_offset(extent, |
| 1763 | btrfs_file_extent_offset(&old) + |
| 1764 | ((end - key.offset) >> inode->i_blkbits)); |
| 1765 | WARN_ON(btrfs_file_extent_num_blocks(&old) < |
| 1766 | (end - key.offset) >> inode->i_blkbits); |
| 1767 | btrfs_set_file_extent_num_blocks(extent, |
| 1768 | btrfs_file_extent_num_blocks(&old) - |
| 1769 | ((end - key.offset) >> inode->i_blkbits)); |
| 1770 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1771 | btrfs_set_file_extent_type(extent, |
| 1772 | BTRFS_FILE_EXTENT_REG); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1773 | btrfs_set_file_extent_generation(extent, |
| 1774 | btrfs_file_extent_generation(&old)); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1775 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1776 | inode->i_blocks += |
| 1777 | btrfs_file_extent_num_blocks(extent) << 3; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1778 | ret = 0; |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 1779 | goto out; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1780 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1781 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1782 | out: |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1783 | btrfs_free_path(path); |
| 1784 | return ret; |
| 1785 | } |
| 1786 | |
| 1787 | static int prepare_pages(struct btrfs_root *root, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1788 | struct file *file, |
| 1789 | struct page **pages, |
| 1790 | size_t num_pages, |
| 1791 | loff_t pos, |
Chris Mason | 2932f3e | 2007-04-10 14:22:02 -0400 | [diff] [blame] | 1792 | unsigned long first_index, |
| 1793 | unsigned long last_index, |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1794 | size_t write_bytes, |
| 1795 | u64 alloc_extent_start) |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1796 | { |
| 1797 | int i; |
| 1798 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
| 1799 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1800 | int offset; |
| 1801 | int err = 0; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1802 | int this_write; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1803 | struct buffer_head *bh; |
| 1804 | struct buffer_head *head; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1805 | loff_t isize = i_size_read(inode); |
| 1806 | |
| 1807 | memset(pages, 0, num_pages * sizeof(struct page *)); |
| 1808 | |
| 1809 | for (i = 0; i < num_pages; i++) { |
| 1810 | pages[i] = grab_cache_page(inode->i_mapping, index + i); |
| 1811 | if (!pages[i]) { |
| 1812 | err = -ENOMEM; |
| 1813 | goto failed_release; |
| 1814 | } |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1815 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
| 1816 | wait_on_page_writeback(pages[i]); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1817 | offset = pos & (PAGE_CACHE_SIZE -1); |
| 1818 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1819 | if (!page_has_buffers(pages[i])) { |
| 1820 | create_empty_buffers(pages[i], |
| 1821 | root->fs_info->sb->s_blocksize, |
| 1822 | (1 << BH_Uptodate)); |
| 1823 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1824 | head = page_buffers(pages[i]); |
| 1825 | bh = head; |
| 1826 | do { |
| 1827 | err = btrfs_map_bh_to_logical(root, bh, |
| 1828 | alloc_extent_start); |
| 1829 | BUG_ON(err); |
| 1830 | if (err) |
| 1831 | goto failed_truncate; |
| 1832 | bh = bh->b_this_page; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1833 | if (alloc_extent_start) |
| 1834 | alloc_extent_start++; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1835 | } while (bh != head); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1836 | pos += this_write; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1837 | WARN_ON(this_write > write_bytes); |
| 1838 | write_bytes -= this_write; |
| 1839 | } |
| 1840 | return 0; |
| 1841 | |
| 1842 | failed_release: |
| 1843 | btrfs_drop_pages(pages, num_pages); |
| 1844 | return err; |
| 1845 | |
| 1846 | failed_truncate: |
| 1847 | btrfs_drop_pages(pages, num_pages); |
| 1848 | if (pos > isize) |
| 1849 | vmtruncate(inode, isize); |
| 1850 | return err; |
| 1851 | } |
| 1852 | |
| 1853 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, |
| 1854 | size_t count, loff_t *ppos) |
| 1855 | { |
| 1856 | loff_t pos; |
| 1857 | size_t num_written = 0; |
| 1858 | int err = 0; |
| 1859 | int ret = 0; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1860 | struct inode *inode = file->f_path.dentry->d_inode; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 1861 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1862 | struct page *pages[8]; |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1863 | struct page *pinned[2]; |
Chris Mason | 2932f3e | 2007-04-10 14:22:02 -0400 | [diff] [blame] | 1864 | unsigned long first_index; |
| 1865 | unsigned long last_index; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1866 | u64 start_pos; |
| 1867 | u64 num_blocks; |
| 1868 | u64 alloc_extent_start; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1869 | u64 hint_block; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1870 | struct btrfs_trans_handle *trans; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1871 | struct btrfs_key ins; |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1872 | pinned[0] = NULL; |
| 1873 | pinned[1] = NULL; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1874 | if (file->f_flags & O_DIRECT) |
| 1875 | return -EINVAL; |
| 1876 | pos = *ppos; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1877 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| 1878 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 1879 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 1880 | if (err) |
| 1881 | goto out; |
| 1882 | if (count == 0) |
| 1883 | goto out; |
| 1884 | err = remove_suid(file->f_path.dentry); |
| 1885 | if (err) |
| 1886 | goto out; |
| 1887 | file_update_time(file); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1888 | |
| 1889 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); |
| 1890 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> |
| 1891 | inode->i_blkbits; |
| 1892 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1893 | mutex_lock(&inode->i_mutex); |
Chris Mason | 2932f3e | 2007-04-10 14:22:02 -0400 | [diff] [blame] | 1894 | first_index = pos >> PAGE_CACHE_SHIFT; |
| 1895 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1896 | |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1897 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
| 1898 | (pos & (PAGE_CACHE_SIZE - 1))) { |
| 1899 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
| 1900 | if (!PageUptodate(pinned[0])) { |
| 1901 | ret = mpage_readpage(pinned[0], btrfs_get_block); |
| 1902 | BUG_ON(ret); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1903 | wait_on_page_locked(pinned[0]); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1904 | } else { |
| 1905 | unlock_page(pinned[0]); |
| 1906 | } |
| 1907 | } |
| 1908 | if (first_index != last_index && |
| 1909 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1910 | pos + count < inode->i_size && |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1911 | (count & (PAGE_CACHE_SIZE - 1))) { |
| 1912 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
| 1913 | if (!PageUptodate(pinned[1])) { |
| 1914 | ret = mpage_readpage(pinned[1], btrfs_get_block); |
| 1915 | BUG_ON(ret); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1916 | wait_on_page_locked(pinned[1]); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1917 | } else { |
| 1918 | unlock_page(pinned[1]); |
| 1919 | } |
| 1920 | } |
| 1921 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1922 | mutex_lock(&root->fs_info->fs_mutex); |
| 1923 | trans = btrfs_start_transaction(root, 1); |
| 1924 | if (!trans) { |
| 1925 | err = -ENOMEM; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1926 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1927 | goto out_unlock; |
| 1928 | } |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 1929 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1930 | /* FIXME blocksize != 4096 */ |
| 1931 | inode->i_blocks += num_blocks << 3; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1932 | hint_block = 0; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1933 | if (start_pos < inode->i_size) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1934 | /* FIXME blocksize != pagesize */ |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1935 | ret = drop_extents(trans, root, inode, |
| 1936 | start_pos, |
| 1937 | (pos + count + root->blocksize -1) & |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1938 | ~((u64)root->blocksize - 1), &hint_block); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1939 | BUG_ON(ret); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1940 | } |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1941 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
| 1942 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { |
Chris Mason | 4d77567 | 2007-04-20 20:23:12 -0400 | [diff] [blame] | 1943 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame^] | 1944 | num_blocks, hint_block, (u64)-1, |
| 1945 | &ins, 1); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1946 | BUG_ON(ret); |
| 1947 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1948 | start_pos, ins.objectid, ins.offset); |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1949 | BUG_ON(ret); |
| 1950 | } else { |
| 1951 | ins.offset = 0; |
| 1952 | ins.objectid = 0; |
| 1953 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1954 | BUG_ON(ret); |
| 1955 | alloc_extent_start = ins.objectid; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 1956 | // btrfs_update_inode_block_group(trans, inode); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1957 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1958 | mutex_unlock(&root->fs_info->fs_mutex); |
| 1959 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1960 | while(count > 0) { |
| 1961 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1962 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); |
| 1963 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
| 1964 | PAGE_CACHE_SHIFT; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1965 | |
| 1966 | memset(pages, 0, sizeof(pages)); |
| 1967 | ret = prepare_pages(root, file, pages, num_pages, |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1968 | pos, first_index, last_index, |
| 1969 | write_bytes, alloc_extent_start); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1970 | BUG_ON(ret); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1971 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1972 | /* FIXME blocks != pagesize */ |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 1973 | if (alloc_extent_start) |
| 1974 | alloc_extent_start += num_pages; |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1975 | ret = btrfs_copy_from_user(pos, num_pages, |
| 1976 | write_bytes, pages, buf); |
| 1977 | BUG_ON(ret); |
| 1978 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 1979 | ret = dirty_and_release_pages(NULL, root, file, pages, |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 1980 | num_pages, pos, write_bytes); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1981 | BUG_ON(ret); |
| 1982 | btrfs_drop_pages(pages, num_pages); |
| 1983 | |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1984 | buf += write_bytes; |
| 1985 | count -= write_bytes; |
| 1986 | pos += write_bytes; |
| 1987 | num_written += write_bytes; |
| 1988 | |
| 1989 | balance_dirty_pages_ratelimited(inode->i_mapping); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 1990 | btrfs_btree_balance_dirty(root); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1991 | cond_resched(); |
| 1992 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 1993 | out_unlock: |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 1994 | mutex_unlock(&inode->i_mutex); |
| 1995 | out: |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1996 | if (pinned[0]) |
| 1997 | page_cache_release(pinned[0]); |
| 1998 | if (pinned[1]) |
| 1999 | page_cache_release(pinned[1]); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 2000 | *ppos = pos; |
| 2001 | current->backing_dev_info = NULL; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 2002 | mark_inode_dirty(inode); |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 2003 | return num_written ? num_written : err; |
| 2004 | } |
| 2005 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 2006 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
| 2007 | unsigned long offset, unsigned long size) |
| 2008 | { |
| 2009 | char *kaddr; |
| 2010 | unsigned long left, count = desc->count; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2011 | struct inode *inode = page->mapping->host; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 2012 | |
| 2013 | if (size > count) |
| 2014 | size = count; |
| 2015 | |
| 2016 | if (!PageChecked(page)) { |
| 2017 | /* FIXME, do it per block */ |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2018 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 2019 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 2020 | int ret = btrfs_csum_verify_file_block(root, |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 2021 | page->mapping->host->i_ino, |
| 2022 | page->index << PAGE_CACHE_SHIFT, |
| 2023 | kmap(page), PAGE_CACHE_SIZE); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 2024 | if (ret) { |
| 2025 | printk("failed to verify ino %lu page %lu\n", |
| 2026 | page->mapping->host->i_ino, |
| 2027 | page->index); |
| 2028 | memset(page_address(page), 0, PAGE_CACHE_SIZE); |
| 2029 | } |
| 2030 | SetPageChecked(page); |
| 2031 | kunmap(page); |
| 2032 | } |
| 2033 | /* |
| 2034 | * Faults on the destination of a read are common, so do it before |
| 2035 | * taking the kmap. |
| 2036 | */ |
| 2037 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { |
| 2038 | kaddr = kmap_atomic(page, KM_USER0); |
| 2039 | left = __copy_to_user_inatomic(desc->arg.buf, |
| 2040 | kaddr + offset, size); |
| 2041 | kunmap_atomic(kaddr, KM_USER0); |
| 2042 | if (left == 0) |
| 2043 | goto success; |
| 2044 | } |
| 2045 | |
| 2046 | /* Do it the slow way */ |
| 2047 | kaddr = kmap(page); |
| 2048 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); |
| 2049 | kunmap(page); |
| 2050 | |
| 2051 | if (left) { |
| 2052 | size -= left; |
| 2053 | desc->error = -EFAULT; |
| 2054 | } |
| 2055 | success: |
| 2056 | desc->count = count - size; |
| 2057 | desc->written += size; |
| 2058 | desc->arg.buf += size; |
| 2059 | return size; |
| 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * btrfs_file_aio_read - filesystem read routine |
| 2064 | * @iocb: kernel I/O control block |
| 2065 | * @iov: io vector request |
| 2066 | * @nr_segs: number of segments in the iovec |
| 2067 | * @pos: current file position |
| 2068 | */ |
| 2069 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 2070 | unsigned long nr_segs, loff_t pos) |
| 2071 | { |
| 2072 | struct file *filp = iocb->ki_filp; |
| 2073 | ssize_t retval; |
| 2074 | unsigned long seg; |
| 2075 | size_t count; |
| 2076 | loff_t *ppos = &iocb->ki_pos; |
| 2077 | |
| 2078 | count = 0; |
| 2079 | for (seg = 0; seg < nr_segs; seg++) { |
| 2080 | const struct iovec *iv = &iov[seg]; |
| 2081 | |
| 2082 | /* |
| 2083 | * If any segment has a negative length, or the cumulative |
| 2084 | * length ever wraps negative then return -EINVAL. |
| 2085 | */ |
| 2086 | count += iv->iov_len; |
| 2087 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) |
| 2088 | return -EINVAL; |
| 2089 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) |
| 2090 | continue; |
| 2091 | if (seg == 0) |
| 2092 | return -EFAULT; |
| 2093 | nr_segs = seg; |
| 2094 | count -= iv->iov_len; /* This segment is no good */ |
| 2095 | break; |
| 2096 | } |
| 2097 | retval = 0; |
| 2098 | if (count) { |
| 2099 | for (seg = 0; seg < nr_segs; seg++) { |
| 2100 | read_descriptor_t desc; |
| 2101 | |
| 2102 | desc.written = 0; |
| 2103 | desc.arg.buf = iov[seg].iov_base; |
| 2104 | desc.count = iov[seg].iov_len; |
| 2105 | if (desc.count == 0) |
| 2106 | continue; |
| 2107 | desc.error = 0; |
| 2108 | do_generic_file_read(filp, ppos, &desc, |
| 2109 | btrfs_read_actor); |
| 2110 | retval += desc.written; |
| 2111 | if (desc.error) { |
| 2112 | retval = retval ?: desc.error; |
| 2113 | break; |
| 2114 | } |
| 2115 | } |
| 2116 | } |
| 2117 | return retval; |
| 2118 | } |
| 2119 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2120 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
| 2121 | { |
| 2122 | struct btrfs_trans_handle *trans; |
| 2123 | struct btrfs_key key; |
| 2124 | struct btrfs_root_item root_item; |
| 2125 | struct btrfs_inode_item *inode_item; |
| 2126 | struct buffer_head *subvol; |
| 2127 | struct btrfs_leaf *leaf; |
| 2128 | struct btrfs_root *new_root; |
| 2129 | struct inode *inode; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 2130 | struct inode *dir; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2131 | int ret; |
| 2132 | u64 objectid; |
| 2133 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
| 2134 | |
| 2135 | mutex_lock(&root->fs_info->fs_mutex); |
| 2136 | trans = btrfs_start_transaction(root, 1); |
| 2137 | BUG_ON(!trans); |
| 2138 | |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 2139 | subvol = btrfs_alloc_free_block(trans, root, 0); |
Chris Mason | 5e82849 | 2007-04-23 19:10:49 -0400 | [diff] [blame] | 2140 | if (subvol == NULL) |
| 2141 | return -ENOSPC; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2142 | leaf = btrfs_buffer_leaf(subvol); |
| 2143 | btrfs_set_header_nritems(&leaf->header, 0); |
| 2144 | btrfs_set_header_level(&leaf->header, 0); |
Chris Mason | 7eccb90 | 2007-04-11 15:53:25 -0400 | [diff] [blame] | 2145 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2146 | btrfs_set_header_generation(&leaf->header, trans->transid); |
Chris Mason | 4d77567 | 2007-04-20 20:23:12 -0400 | [diff] [blame] | 2147 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2148 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
| 2149 | sizeof(leaf->header.fsid)); |
Chris Mason | 4d77567 | 2007-04-20 20:23:12 -0400 | [diff] [blame] | 2150 | mark_buffer_dirty(subvol); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2151 | |
| 2152 | inode_item = &root_item.inode; |
| 2153 | memset(inode_item, 0, sizeof(*inode_item)); |
| 2154 | btrfs_set_inode_generation(inode_item, 1); |
| 2155 | btrfs_set_inode_size(inode_item, 3); |
| 2156 | btrfs_set_inode_nlink(inode_item, 1); |
| 2157 | btrfs_set_inode_nblocks(inode_item, 1); |
| 2158 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); |
| 2159 | |
Chris Mason | 7eccb90 | 2007-04-11 15:53:25 -0400 | [diff] [blame] | 2160 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2161 | btrfs_set_root_refs(&root_item, 1); |
Chris Mason | 5e82849 | 2007-04-23 19:10:49 -0400 | [diff] [blame] | 2162 | brelse(subvol); |
| 2163 | subvol = NULL; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2164 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2165 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
| 2166 | 0, &objectid); |
| 2167 | BUG_ON(ret); |
| 2168 | |
| 2169 | btrfs_set_root_dirid(&root_item, new_dirid); |
| 2170 | |
| 2171 | key.objectid = objectid; |
| 2172 | key.offset = 1; |
| 2173 | key.flags = 0; |
| 2174 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 2175 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 2176 | &root_item); |
| 2177 | BUG_ON(ret); |
| 2178 | |
| 2179 | /* |
| 2180 | * insert the directory item |
| 2181 | */ |
| 2182 | key.offset = (u64)-1; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 2183 | dir = root->fs_info->sb->s_root->d_inode; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2184 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 2185 | name, namelen, dir->i_ino, &key, 0); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2186 | BUG_ON(ret); |
| 2187 | |
| 2188 | ret = btrfs_commit_transaction(trans, root); |
| 2189 | BUG_ON(ret); |
| 2190 | |
| 2191 | new_root = btrfs_read_fs_root(root->fs_info, &key); |
| 2192 | BUG_ON(!new_root); |
| 2193 | |
| 2194 | trans = btrfs_start_transaction(new_root, 1); |
| 2195 | BUG_ON(!trans); |
| 2196 | |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 2197 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
| 2198 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2199 | inode->i_op = &btrfs_dir_inode_operations; |
| 2200 | inode->i_fop = &btrfs_dir_file_operations; |
| 2201 | |
| 2202 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); |
| 2203 | BUG_ON(ret); |
| 2204 | |
| 2205 | inode->i_nlink = 1; |
| 2206 | inode->i_size = 6; |
| 2207 | ret = btrfs_update_inode(trans, new_root, inode); |
| 2208 | BUG_ON(ret); |
| 2209 | |
| 2210 | ret = btrfs_commit_transaction(trans, new_root); |
| 2211 | BUG_ON(ret); |
| 2212 | |
| 2213 | iput(inode); |
| 2214 | |
| 2215 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 2216 | btrfs_btree_balance_dirty(root); |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2217 | return 0; |
| 2218 | } |
| 2219 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2220 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
| 2221 | { |
| 2222 | struct btrfs_trans_handle *trans; |
| 2223 | struct btrfs_key key; |
| 2224 | struct btrfs_root_item new_root_item; |
| 2225 | int ret; |
| 2226 | u64 objectid; |
| 2227 | |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2228 | if (!root->ref_cows) |
| 2229 | return -EINVAL; |
| 2230 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2231 | mutex_lock(&root->fs_info->fs_mutex); |
| 2232 | trans = btrfs_start_transaction(root, 1); |
| 2233 | BUG_ON(!trans); |
| 2234 | |
| 2235 | ret = btrfs_update_inode(trans, root, root->inode); |
| 2236 | BUG_ON(ret); |
| 2237 | |
Chris Mason | 1b05da2 | 2007-04-10 12:13:09 -0400 | [diff] [blame] | 2238 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
| 2239 | 0, &objectid); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2240 | BUG_ON(ret); |
| 2241 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2242 | memcpy(&new_root_item, &root->root_item, |
| 2243 | sizeof(new_root_item)); |
| 2244 | |
| 2245 | key.objectid = objectid; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2246 | key.offset = 1; |
| 2247 | key.flags = 0; |
| 2248 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
Chris Mason | 7eccb90 | 2007-04-11 15:53:25 -0400 | [diff] [blame] | 2249 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2250 | |
| 2251 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 2252 | &new_root_item); |
| 2253 | BUG_ON(ret); |
| 2254 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2255 | /* |
| 2256 | * insert the directory item |
| 2257 | */ |
| 2258 | key.offset = (u64)-1; |
| 2259 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
| 2260 | name, namelen, |
| 2261 | root->fs_info->sb->s_root->d_inode->i_ino, |
| 2262 | &key, 0); |
| 2263 | |
| 2264 | BUG_ON(ret); |
| 2265 | |
| 2266 | ret = btrfs_inc_root_ref(trans, root); |
| 2267 | BUG_ON(ret); |
| 2268 | |
| 2269 | ret = btrfs_commit_transaction(trans, root); |
| 2270 | BUG_ON(ret); |
| 2271 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 2272 | btrfs_btree_balance_dirty(root); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2273 | return 0; |
| 2274 | } |
| 2275 | |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2276 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
| 2277 | { |
| 2278 | struct block_device *bdev; |
| 2279 | struct btrfs_path *path; |
| 2280 | struct super_block *sb = root->fs_info->sb; |
| 2281 | struct btrfs_root *dev_root = root->fs_info->dev_root; |
| 2282 | struct btrfs_trans_handle *trans; |
| 2283 | struct btrfs_device_item *dev_item; |
| 2284 | struct btrfs_key key; |
| 2285 | u16 item_size; |
| 2286 | u64 num_blocks; |
| 2287 | u64 new_blocks; |
Chris Mason | b4100d6 | 2007-04-12 12:14:00 -0400 | [diff] [blame] | 2288 | u64 device_id; |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2289 | int ret; |
Chris Mason | b4100d6 | 2007-04-12 12:14:00 -0400 | [diff] [blame] | 2290 | |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2291 | printk("adding disk %s\n", name); |
| 2292 | path = btrfs_alloc_path(); |
| 2293 | if (!path) |
| 2294 | return -ENOMEM; |
| 2295 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); |
| 2296 | bdev = open_bdev_excl(name, O_RDWR, sb); |
| 2297 | if (IS_ERR(bdev)) { |
| 2298 | ret = PTR_ERR(bdev); |
| 2299 | printk("open bdev excl failed ret %d\n", ret); |
| 2300 | goto out_nolock; |
| 2301 | } |
| 2302 | set_blocksize(bdev, sb->s_blocksize); |
| 2303 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; |
| 2304 | key.objectid = num_blocks; |
| 2305 | key.offset = new_blocks; |
| 2306 | key.flags = 0; |
| 2307 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); |
| 2308 | |
| 2309 | mutex_lock(&dev_root->fs_info->fs_mutex); |
| 2310 | trans = btrfs_start_transaction(dev_root, 1); |
| 2311 | item_size = sizeof(*dev_item) + namelen; |
| 2312 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); |
| 2313 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); |
| 2314 | if (ret) { |
| 2315 | printk("insert failed %d\n", ret); |
| 2316 | close_bdev_excl(bdev); |
| 2317 | if (ret > 0) |
| 2318 | ret = -EEXIST; |
| 2319 | goto out; |
| 2320 | } |
| 2321 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
| 2322 | path->slots[0], struct btrfs_device_item); |
| 2323 | btrfs_set_device_pathlen(dev_item, namelen); |
| 2324 | memcpy(dev_item + 1, name, namelen); |
Chris Mason | b4100d6 | 2007-04-12 12:14:00 -0400 | [diff] [blame] | 2325 | |
| 2326 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; |
| 2327 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); |
| 2328 | btrfs_set_device_id(dev_item, device_id); |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2329 | mark_buffer_dirty(path->nodes[0]); |
| 2330 | |
Chris Mason | b4100d6 | 2007-04-12 12:14:00 -0400 | [diff] [blame] | 2331 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
| 2332 | new_blocks); |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2333 | |
| 2334 | if (!ret) { |
| 2335 | btrfs_set_super_total_blocks(root->fs_info->disk_super, |
| 2336 | num_blocks + new_blocks); |
| 2337 | i_size_write(root->fs_info->btree_inode, |
| 2338 | (num_blocks + new_blocks) << |
| 2339 | root->fs_info->btree_inode->i_blkbits); |
| 2340 | } |
| 2341 | |
| 2342 | out: |
| 2343 | ret = btrfs_commit_transaction(trans, dev_root); |
| 2344 | BUG_ON(ret); |
| 2345 | mutex_unlock(&root->fs_info->fs_mutex); |
| 2346 | out_nolock: |
| 2347 | btrfs_free_path(path); |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 2348 | btrfs_btree_balance_dirty(root); |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2349 | |
| 2350 | return ret; |
| 2351 | } |
| 2352 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2353 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
| 2354 | cmd, unsigned long arg) |
| 2355 | { |
| 2356 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2357 | struct btrfs_ioctl_vol_args vol_args; |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2358 | int ret = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 2359 | struct btrfs_dir_item *di; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2360 | int namelen; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2361 | struct btrfs_path *path; |
| 2362 | u64 root_dirid; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2363 | |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2364 | switch (cmd) { |
| 2365 | case BTRFS_IOC_SNAP_CREATE: |
| 2366 | if (copy_from_user(&vol_args, |
| 2367 | (struct btrfs_ioctl_vol_args __user *)arg, |
| 2368 | sizeof(vol_args))) |
| 2369 | return -EFAULT; |
| 2370 | namelen = strlen(vol_args.name); |
| 2371 | if (namelen > BTRFS_VOL_NAME_MAX) |
| 2372 | return -EINVAL; |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2373 | path = btrfs_alloc_path(); |
| 2374 | if (!path) |
| 2375 | return -ENOMEM; |
Chris Mason | 2d13d8d | 2007-04-10 20:07:20 -0400 | [diff] [blame] | 2376 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2377 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 2378 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2379 | path, root_dirid, |
| 2380 | vol_args.name, namelen, 0); |
| 2381 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 2d13d8d | 2007-04-10 20:07:20 -0400 | [diff] [blame] | 2382 | btrfs_free_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 2383 | if (di && !IS_ERR(di)) |
Chris Mason | 2619ba1 | 2007-04-10 16:58:11 -0400 | [diff] [blame] | 2384 | return -EEXIST; |
| 2385 | |
| 2386 | if (root == root->fs_info->tree_root) |
| 2387 | ret = create_subvol(root, vol_args.name, namelen); |
| 2388 | else |
| 2389 | ret = create_snapshot(root, vol_args.name, namelen); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2390 | WARN_ON(ret); |
| 2391 | break; |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2392 | case BTRFS_IOC_ADD_DISK: |
| 2393 | if (copy_from_user(&vol_args, |
| 2394 | (struct btrfs_ioctl_vol_args __user *)arg, |
| 2395 | sizeof(vol_args))) |
| 2396 | return -EFAULT; |
| 2397 | namelen = strlen(vol_args.name); |
| 2398 | if (namelen > BTRFS_VOL_NAME_MAX) |
| 2399 | return -EINVAL; |
| 2400 | vol_args.name[namelen] = '\0'; |
| 2401 | ret = add_disk(root, vol_args.name, namelen); |
| 2402 | break; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2403 | default: |
| 2404 | return -ENOTTY; |
| 2405 | } |
Chris Mason | 8352d8a | 2007-04-12 10:43:05 -0400 | [diff] [blame] | 2406 | return ret; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2407 | } |
| 2408 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2409 | static struct kmem_cache *btrfs_inode_cachep; |
| 2410 | struct kmem_cache *btrfs_trans_handle_cachep; |
| 2411 | struct kmem_cache *btrfs_transaction_cachep; |
| 2412 | struct kmem_cache *btrfs_bit_radix_cachep; |
| 2413 | struct kmem_cache *btrfs_path_cachep; |
| 2414 | |
| 2415 | /* |
| 2416 | * Called inside transaction, so use GFP_NOFS |
| 2417 | */ |
| 2418 | static struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 2419 | { |
| 2420 | struct btrfs_inode *ei; |
| 2421 | |
| 2422 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 2423 | if (!ei) |
| 2424 | return NULL; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2425 | return &ei->vfs_inode; |
| 2426 | } |
| 2427 | |
| 2428 | static void btrfs_destroy_inode(struct inode *inode) |
| 2429 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2430 | WARN_ON(!list_empty(&inode->i_dentry)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2431 | WARN_ON(inode->i_data.nrpages); |
| 2432 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2433 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 2434 | } |
| 2435 | |
| 2436 | static void init_once(void * foo, struct kmem_cache * cachep, |
| 2437 | unsigned long flags) |
| 2438 | { |
| 2439 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 2440 | |
| 2441 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 2442 | SLAB_CTOR_CONSTRUCTOR) { |
| 2443 | inode_init_once(&ei->vfs_inode); |
| 2444 | } |
| 2445 | } |
| 2446 | |
| 2447 | static int init_inodecache(void) |
| 2448 | { |
| 2449 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 2450 | sizeof(struct btrfs_inode), |
| 2451 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2452 | SLAB_MEM_SPREAD), |
| 2453 | init_once, NULL); |
| 2454 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 2455 | sizeof(struct btrfs_trans_handle), |
| 2456 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2457 | SLAB_MEM_SPREAD), |
| 2458 | NULL, NULL); |
| 2459 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 2460 | sizeof(struct btrfs_transaction), |
| 2461 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2462 | SLAB_MEM_SPREAD), |
| 2463 | NULL, NULL); |
| 2464 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 2465 | sizeof(struct btrfs_transaction), |
| 2466 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2467 | SLAB_MEM_SPREAD), |
| 2468 | NULL, NULL); |
| 2469 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", |
| 2470 | 256, |
| 2471 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2472 | SLAB_MEM_SPREAD | |
| 2473 | SLAB_DESTROY_BY_RCU), |
| 2474 | NULL, NULL); |
| 2475 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || |
| 2476 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) |
| 2477 | return -ENOMEM; |
| 2478 | return 0; |
| 2479 | } |
| 2480 | |
| 2481 | static void destroy_inodecache(void) |
| 2482 | { |
| 2483 | kmem_cache_destroy(btrfs_inode_cachep); |
| 2484 | kmem_cache_destroy(btrfs_trans_handle_cachep); |
| 2485 | kmem_cache_destroy(btrfs_transaction_cachep); |
| 2486 | kmem_cache_destroy(btrfs_bit_radix_cachep); |
| 2487 | kmem_cache_destroy(btrfs_path_cachep); |
| 2488 | } |
| 2489 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2490 | static int btrfs_get_sb(struct file_system_type *fs_type, |
| 2491 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| 2492 | { |
| 2493 | return get_sb_bdev(fs_type, flags, dev_name, data, |
| 2494 | btrfs_fill_super, mnt); |
| 2495 | } |
| 2496 | |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 2497 | static int btrfs_getattr(struct vfsmount *mnt, |
| 2498 | struct dentry *dentry, struct kstat *stat) |
| 2499 | { |
| 2500 | struct inode *inode = dentry->d_inode; |
| 2501 | generic_fillattr(inode, stat); |
| 2502 | stat->blksize = 256 * 1024; |
| 2503 | return 0; |
| 2504 | } |
| 2505 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2506 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 2507 | { |
| 2508 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
| 2509 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; |
| 2510 | |
| 2511 | buf->f_namelen = BTRFS_NAME_LEN; |
| 2512 | buf->f_blocks = btrfs_super_total_blocks(disk_super); |
| 2513 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); |
| 2514 | buf->f_bavail = buf->f_bfree; |
| 2515 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 2516 | buf->f_type = BTRFS_SUPER_MAGIC; |
| 2517 | return 0; |
| 2518 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 2519 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2520 | static struct file_system_type btrfs_fs_type = { |
| 2521 | .owner = THIS_MODULE, |
| 2522 | .name = "btrfs", |
| 2523 | .get_sb = btrfs_get_sb, |
| 2524 | .kill_sb = kill_block_super, |
| 2525 | .fs_flags = FS_REQUIRES_DEV, |
| 2526 | }; |
| 2527 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2528 | static struct super_operations btrfs_super_ops = { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 2529 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2530 | .put_super = btrfs_put_super, |
| 2531 | .read_inode = btrfs_read_locked_inode, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 2532 | .write_super = btrfs_write_super, |
| 2533 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 2534 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 2535 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2536 | .alloc_inode = btrfs_alloc_inode, |
| 2537 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2538 | .statfs = btrfs_statfs, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2539 | }; |
| 2540 | |
| 2541 | static struct inode_operations btrfs_dir_inode_operations = { |
| 2542 | .lookup = btrfs_lookup, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 2543 | .create = btrfs_create, |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 2544 | .unlink = btrfs_unlink, |
Chris Mason | f792203 | 2007-03-25 20:17:36 -0400 | [diff] [blame] | 2545 | .mkdir = btrfs_mkdir, |
Chris Mason | 5f443fd | 2007-03-27 13:42:32 -0400 | [diff] [blame] | 2546 | .rmdir = btrfs_rmdir, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2547 | }; |
| 2548 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2549 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
| 2550 | .lookup = btrfs_lookup, |
| 2551 | }; |
| 2552 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2553 | static struct file_operations btrfs_dir_file_operations = { |
| 2554 | .llseek = generic_file_llseek, |
| 2555 | .read = generic_read_dir, |
| 2556 | .readdir = btrfs_readdir, |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2557 | .ioctl = btrfs_ioctl, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2558 | }; |
| 2559 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2560 | static struct address_space_operations btrfs_aops = { |
| 2561 | .readpage = btrfs_readpage, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2562 | .writepage = btrfs_writepage, |
| 2563 | .sync_page = block_sync_page, |
| 2564 | .prepare_write = btrfs_prepare_write, |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 2565 | .commit_write = btrfs_commit_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2566 | }; |
| 2567 | |
| 2568 | static struct inode_operations btrfs_file_inode_operations = { |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 2569 | .truncate = btrfs_truncate, |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 2570 | .getattr = btrfs_getattr, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2571 | }; |
| 2572 | |
| 2573 | static struct file_operations btrfs_file_operations = { |
| 2574 | .llseek = generic_file_llseek, |
| 2575 | .read = do_sync_read, |
Chris Mason | e8f05c4 | 2007-04-04 14:30:09 -0400 | [diff] [blame] | 2576 | .aio_read = btrfs_file_aio_read, |
| 2577 | .write = btrfs_file_write, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2578 | .mmap = generic_file_mmap, |
| 2579 | .open = generic_file_open, |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 2580 | .ioctl = btrfs_ioctl, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2581 | .fsync = btrfs_sync_file, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 2582 | }; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2583 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2584 | static int __init init_btrfs_fs(void) |
| 2585 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2586 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2587 | printk("btrfs loaded!\n"); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2588 | err = init_inodecache(); |
| 2589 | if (err) |
| 2590 | return err; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2591 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
| 2592 | err = subsystem_register(&btrfs_subsys); |
| 2593 | if (err) |
| 2594 | goto out; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2595 | return register_filesystem(&btrfs_fs_type); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2596 | out: |
| 2597 | destroy_inodecache(); |
| 2598 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2599 | } |
| 2600 | |
| 2601 | static void __exit exit_btrfs_fs(void) |
| 2602 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2603 | destroy_inodecache(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2604 | unregister_filesystem(&btrfs_fs_type); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 2605 | subsystem_unregister(&btrfs_subsys); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2606 | printk("btrfs unloaded\n"); |
| 2607 | } |
| 2608 | |
| 2609 | module_init(init_btrfs_fs) |
| 2610 | module_exit(exit_btrfs_fs) |
| 2611 | |
| 2612 | MODULE_LICENSE("GPL"); |