Btrfs: Make the code for reading/writing free space cache generic
Extract out block group specific code from lookup_free_space_inode(), create_free_space_inode(), load_free_space_cache() and btrfs_write_out_cache(), so the code can be used to read/write free ino cache. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan
parent
581bb05094
commit
0414efae79
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@ -33,9 +33,9 @@
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static int link_free_space(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info);
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struct inode *lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_block_group_cache
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*block_group, struct btrfs_path *path)
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static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_path *path,
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u64 offset)
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{
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struct btrfs_key key;
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struct btrfs_key location;
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@ -45,15 +45,8 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
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struct inode *inode = NULL;
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int ret;
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spin_lock(&block_group->lock);
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if (block_group->inode)
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inode = igrab(block_group->inode);
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spin_unlock(&block_group->lock);
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if (inode)
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return inode;
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.offset = block_group->key.objectid;
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key.offset = offset;
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key.type = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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@ -83,6 +76,27 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
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inode->i_mapping->flags &= ~__GFP_FS;
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return inode;
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}
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struct inode *lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_block_group_cache
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*block_group, struct btrfs_path *path)
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{
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struct inode *inode = NULL;
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spin_lock(&block_group->lock);
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if (block_group->inode)
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inode = igrab(block_group->inode);
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spin_unlock(&block_group->lock);
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if (inode)
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return inode;
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inode = __lookup_free_space_inode(root, path,
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block_group->key.objectid);
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if (IS_ERR(inode))
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return inode;
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spin_lock(&block_group->lock);
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if (!root->fs_info->closing) {
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block_group->inode = igrab(inode);
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@ -93,24 +107,18 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
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return inode;
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}
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int create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path)
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int __create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path, u64 ino, u64 offset)
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{
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struct btrfs_key key;
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struct btrfs_disk_key disk_key;
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struct btrfs_free_space_header *header;
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struct btrfs_inode_item *inode_item;
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struct extent_buffer *leaf;
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u64 objectid;
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int ret;
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ret = btrfs_find_free_objectid(root, &objectid);
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if (ret < 0)
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return ret;
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ret = btrfs_insert_empty_inode(trans, root, path, objectid);
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ret = btrfs_insert_empty_inode(trans, root, path, ino);
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if (ret)
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return ret;
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@ -130,13 +138,12 @@ int create_free_space_inode(struct btrfs_root *root,
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BTRFS_INODE_PREALLOC | BTRFS_INODE_NODATASUM);
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btrfs_set_inode_nlink(leaf, inode_item, 1);
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btrfs_set_inode_transid(leaf, inode_item, trans->transid);
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btrfs_set_inode_block_group(leaf, inode_item,
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block_group->key.objectid);
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btrfs_set_inode_block_group(leaf, inode_item, offset);
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btrfs_mark_buffer_dirty(leaf);
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btrfs_release_path(root, path);
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.offset = block_group->key.objectid;
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key.offset = offset;
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key.type = 0;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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@ -156,6 +163,22 @@ int create_free_space_inode(struct btrfs_root *root,
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return 0;
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}
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int create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path)
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{
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int ret;
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u64 ino;
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ret = btrfs_find_free_objectid(root, &ino);
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if (ret < 0)
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return ret;
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return __create_free_space_inode(root, trans, path, ino,
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block_group->key.objectid);
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}
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int btrfs_truncate_free_space_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path,
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@ -208,16 +231,13 @@ static int readahead_cache(struct inode *inode)
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return 0;
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}
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int load_free_space_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group)
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int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
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struct btrfs_free_space_ctl *ctl,
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struct btrfs_path *path, u64 offset)
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{
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struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
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struct btrfs_root *root = fs_info->tree_root;
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struct inode *inode;
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struct btrfs_free_space_header *header;
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struct extent_buffer *leaf;
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struct page *page;
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struct btrfs_path *path;
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u32 *checksums = NULL, *crc;
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char *disk_crcs = NULL;
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struct btrfs_key key;
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@ -225,76 +245,47 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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u64 num_entries;
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u64 num_bitmaps;
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u64 generation;
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u64 used = btrfs_block_group_used(&block_group->item);
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u32 cur_crc = ~(u32)0;
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pgoff_t index = 0;
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unsigned long first_page_offset;
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int num_checksums;
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int ret = 0;
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/*
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* If we're unmounting then just return, since this does a search on the
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* normal root and not the commit root and we could deadlock.
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*/
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smp_mb();
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if (fs_info->closing)
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return 0;
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/*
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* If this block group has been marked to be cleared for one reason or
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* another then we can't trust the on disk cache, so just return.
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*/
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spin_lock(&block_group->lock);
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if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
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spin_unlock(&block_group->lock);
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return 0;
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}
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spin_unlock(&block_group->lock);
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int ret = 0, ret2;
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INIT_LIST_HEAD(&bitmaps);
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path = btrfs_alloc_path();
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if (!path)
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return 0;
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inode = lookup_free_space_inode(root, block_group, path);
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if (IS_ERR(inode)) {
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btrfs_free_path(path);
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return 0;
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}
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/* Nothing in the space cache, goodbye */
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if (!i_size_read(inode)) {
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btrfs_free_path(path);
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if (!i_size_read(inode))
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goto out;
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}
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.offset = block_group->key.objectid;
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key.offset = offset;
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key.type = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret) {
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btrfs_free_path(path);
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if (ret < 0)
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goto out;
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else if (ret > 0) {
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btrfs_release_path(root, path);
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ret = 0;
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goto out;
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}
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ret = -1;
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leaf = path->nodes[0];
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header = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_free_space_header);
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num_entries = btrfs_free_space_entries(leaf, header);
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num_bitmaps = btrfs_free_space_bitmaps(leaf, header);
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generation = btrfs_free_space_generation(leaf, header);
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btrfs_free_path(path);
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btrfs_release_path(root, path);
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if (BTRFS_I(inode)->generation != generation) {
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printk(KERN_ERR "btrfs: free space inode generation (%llu) did"
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" not match free space cache generation (%llu) for "
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"block group %llu\n",
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" not match free space cache generation (%llu)\n",
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(unsigned long long)BTRFS_I(inode)->generation,
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(unsigned long long)generation,
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(unsigned long long)block_group->key.objectid);
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goto free_cache;
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(unsigned long long)generation);
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goto out;
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}
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if (!num_entries)
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@ -311,10 +302,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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goto out;
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ret = readahead_cache(inode);
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if (ret) {
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ret = 0;
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if (ret)
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goto out;
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}
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while (1) {
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struct btrfs_free_space_entry *entry;
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@ -333,10 +322,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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}
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page = grab_cache_page(inode->i_mapping, index);
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if (!page) {
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ret = 0;
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if (!page)
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goto free_cache;
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}
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if (!PageUptodate(page)) {
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btrfs_readpage(NULL, page);
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@ -345,9 +332,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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unlock_page(page);
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page_cache_release(page);
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printk(KERN_ERR "btrfs: error reading free "
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"space cache: %llu\n",
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(unsigned long long)
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block_group->key.objectid);
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"space cache\n");
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goto free_cache;
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}
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}
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@ -360,13 +345,10 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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gen = addr + (sizeof(u32) * num_checksums);
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if (*gen != BTRFS_I(inode)->generation) {
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printk(KERN_ERR "btrfs: space cache generation"
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" (%llu) does not match inode (%llu) "
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"for block group %llu\n",
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" (%llu) does not match inode (%llu)\n",
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(unsigned long long)*gen,
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(unsigned long long)
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BTRFS_I(inode)->generation,
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(unsigned long long)
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block_group->key.objectid);
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BTRFS_I(inode)->generation);
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kunmap(page);
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unlock_page(page);
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page_cache_release(page);
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@ -382,9 +364,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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PAGE_CACHE_SIZE - start_offset);
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btrfs_csum_final(cur_crc, (char *)&cur_crc);
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if (cur_crc != *crc) {
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printk(KERN_ERR "btrfs: crc mismatch for page %lu in "
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"block group %llu\n", index,
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(unsigned long long)block_group->key.objectid);
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printk(KERN_ERR "btrfs: crc mismatch for page %lu\n",
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index);
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kunmap(page);
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unlock_page(page);
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page_cache_release(page);
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@ -432,7 +413,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
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goto free_cache;
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}
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spin_lock(&ctl->tree_lock);
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ret = link_free_space(ctl, e);
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ret2 = link_free_space(ctl, e);
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ctl->total_bitmaps++;
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ctl->op->recalc_thresholds(ctl);
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spin_unlock(&ctl->tree_lock);
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@ -471,42 +452,96 @@ next:
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index++;
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}
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spin_lock(&ctl->tree_lock);
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if (ctl->free_space != (block_group->key.offset - used -
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block_group->bytes_super)) {
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spin_unlock(&ctl->tree_lock);
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printk(KERN_ERR "block group %llu has an wrong amount of free "
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"space\n", block_group->key.objectid);
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ret = 0;
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goto free_cache;
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}
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spin_unlock(&ctl->tree_lock);
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ret = 1;
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out:
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kfree(checksums);
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kfree(disk_crcs);
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iput(inode);
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return ret;
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free_cache:
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/* This cache is bogus, make sure it gets cleared */
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spin_lock(&block_group->lock);
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block_group->disk_cache_state = BTRFS_DC_CLEAR;
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spin_unlock(&block_group->lock);
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btrfs_remove_free_space_cache(block_group);
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__btrfs_remove_free_space_cache(ctl);
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goto out;
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}
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int btrfs_write_out_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path)
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int load_free_space_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group)
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{
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struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
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struct btrfs_root *root = fs_info->tree_root;
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struct inode *inode;
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struct btrfs_path *path;
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int ret;
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bool matched;
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u64 used = btrfs_block_group_used(&block_group->item);
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/*
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* If we're unmounting then just return, since this does a search on the
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* normal root and not the commit root and we could deadlock.
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*/
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smp_mb();
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if (fs_info->closing)
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return 0;
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/*
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* If this block group has been marked to be cleared for one reason or
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* another then we can't trust the on disk cache, so just return.
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*/
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spin_lock(&block_group->lock);
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if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
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spin_unlock(&block_group->lock);
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return 0;
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}
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spin_unlock(&block_group->lock);
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path = btrfs_alloc_path();
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if (!path)
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return 0;
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inode = lookup_free_space_inode(root, block_group, path);
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if (IS_ERR(inode)) {
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btrfs_free_path(path);
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return 0;
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}
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ret = __load_free_space_cache(fs_info->tree_root, inode, ctl,
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path, block_group->key.objectid);
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btrfs_free_path(path);
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if (ret <= 0)
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goto out;
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spin_lock(&ctl->tree_lock);
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matched = (ctl->free_space == (block_group->key.offset - used -
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block_group->bytes_super));
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spin_unlock(&ctl->tree_lock);
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if (!matched) {
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__btrfs_remove_free_space_cache(ctl);
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printk(KERN_ERR "block group %llu has an wrong amount of free "
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"space\n", block_group->key.objectid);
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ret = -1;
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}
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out:
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if (ret < 0) {
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/* This cache is bogus, make sure it gets cleared */
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spin_lock(&block_group->lock);
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block_group->disk_cache_state = BTRFS_DC_CLEAR;
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spin_unlock(&block_group->lock);
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printk(KERN_ERR "btrfs: failed to load free space cache "
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"for block group %llu\n", block_group->key.objectid);
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}
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iput(inode);
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return ret;
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}
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int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
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struct btrfs_free_space_ctl *ctl,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path, u64 offset)
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{
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struct btrfs_free_space_header *header;
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struct extent_buffer *leaf;
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struct inode *inode;
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struct rb_node *node;
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struct list_head *pos, *n;
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struct page **pages;
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@ -523,35 +558,18 @@ int btrfs_write_out_cache(struct btrfs_root *root,
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int index = 0, num_pages = 0;
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int entries = 0;
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int bitmaps = 0;
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int ret = 0;
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int ret = -1;
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bool next_page = false;
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bool out_of_space = false;
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root = root->fs_info->tree_root;
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INIT_LIST_HEAD(&bitmap_list);
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spin_lock(&block_group->lock);
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if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
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spin_unlock(&block_group->lock);
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return 0;
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}
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spin_unlock(&block_group->lock);
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|
||||
inode = lookup_free_space_inode(root, block_group, path);
|
||||
if (IS_ERR(inode))
|
||||
return 0;
|
||||
|
||||
if (!i_size_read(inode)) {
|
||||
iput(inode);
|
||||
return 0;
|
||||
}
|
||||
|
||||
node = rb_first(&ctl->free_space_offset);
|
||||
if (!node) {
|
||||
iput(inode);
|
||||
if (!node)
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!i_size_read(inode))
|
||||
return -1;
|
||||
|
||||
num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
|
||||
PAGE_CACHE_SHIFT;
|
||||
|
|
@ -561,16 +579,13 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
|
||||
/* We need a checksum per page. */
|
||||
crc = checksums = kzalloc(sizeof(u32) * num_pages, GFP_NOFS);
|
||||
if (!crc) {
|
||||
iput(inode);
|
||||
return 0;
|
||||
}
|
||||
if (!crc)
|
||||
return -1;
|
||||
|
||||
pages = kzalloc(sizeof(struct page *) * num_pages, GFP_NOFS);
|
||||
if (!pages) {
|
||||
kfree(crc);
|
||||
iput(inode);
|
||||
return 0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Since the first page has all of our checksums and our generation we
|
||||
|
|
@ -580,7 +595,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
first_page_offset = (sizeof(u32) * num_pages) + sizeof(u64);
|
||||
|
||||
/* Get the cluster for this block_group if it exists */
|
||||
if (!list_empty(&block_group->cluster_list))
|
||||
if (block_group && !list_empty(&block_group->cluster_list))
|
||||
cluster = list_entry(block_group->cluster_list.next,
|
||||
struct btrfs_free_cluster,
|
||||
block_group_list);
|
||||
|
|
@ -622,7 +637,8 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
* When searching for pinned extents, we need to start at our start
|
||||
* offset.
|
||||
*/
|
||||
start = block_group->key.objectid;
|
||||
if (block_group)
|
||||
start = block_group->key.objectid;
|
||||
|
||||
/* Write out the extent entries */
|
||||
do {
|
||||
|
|
@ -680,8 +696,9 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
* We want to add any pinned extents to our free space cache
|
||||
* so we don't leak the space
|
||||
*/
|
||||
while (!next_page && (start < block_group->key.objectid +
|
||||
block_group->key.offset)) {
|
||||
while (block_group && !next_page &&
|
||||
(start < block_group->key.objectid +
|
||||
block_group->key.offset)) {
|
||||
ret = find_first_extent_bit(unpin, start, &start, &end,
|
||||
EXTENT_DIRTY);
|
||||
if (ret) {
|
||||
|
|
@ -799,12 +816,12 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
filemap_write_and_wait(inode->i_mapping);
|
||||
|
||||
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
||||
key.offset = block_group->key.objectid;
|
||||
key.offset = offset;
|
||||
key.type = 0;
|
||||
|
||||
ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
|
||||
if (ret < 0) {
|
||||
ret = 0;
|
||||
ret = -1;
|
||||
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1,
|
||||
EXTENT_DIRTY | EXTENT_DELALLOC |
|
||||
EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
|
||||
|
|
@ -817,8 +834,8 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
path->slots[0]--;
|
||||
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
||||
if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID ||
|
||||
found_key.offset != block_group->key.objectid) {
|
||||
ret = 0;
|
||||
found_key.offset != offset) {
|
||||
ret = -1;
|
||||
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1,
|
||||
EXTENT_DIRTY | EXTENT_DELALLOC |
|
||||
EXTENT_DO_ACCOUNTING, 0, 0, NULL,
|
||||
|
|
@ -838,16 +855,49 @@ int btrfs_write_out_cache(struct btrfs_root *root,
|
|||
ret = 1;
|
||||
|
||||
out_free:
|
||||
if (ret == 0) {
|
||||
if (ret != 1) {
|
||||
invalidate_inode_pages2_range(inode->i_mapping, 0, index);
|
||||
spin_lock(&block_group->lock);
|
||||
block_group->disk_cache_state = BTRFS_DC_ERROR;
|
||||
spin_unlock(&block_group->lock);
|
||||
BTRFS_I(inode)->generation = 0;
|
||||
}
|
||||
kfree(checksums);
|
||||
kfree(pages);
|
||||
btrfs_update_inode(trans, root, inode);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int btrfs_write_out_cache(struct btrfs_root *root,
|
||||
struct btrfs_trans_handle *trans,
|
||||
struct btrfs_block_group_cache *block_group,
|
||||
struct btrfs_path *path)
|
||||
{
|
||||
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
||||
struct inode *inode;
|
||||
int ret = 0;
|
||||
|
||||
root = root->fs_info->tree_root;
|
||||
|
||||
spin_lock(&block_group->lock);
|
||||
if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
|
||||
spin_unlock(&block_group->lock);
|
||||
return 0;
|
||||
}
|
||||
spin_unlock(&block_group->lock);
|
||||
|
||||
inode = lookup_free_space_inode(root, block_group, path);
|
||||
if (IS_ERR(inode))
|
||||
return 0;
|
||||
|
||||
ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans,
|
||||
path, block_group->key.objectid);
|
||||
if (ret < 0) {
|
||||
spin_lock(&block_group->lock);
|
||||
block_group->disk_cache_state = BTRFS_DC_ERROR;
|
||||
spin_unlock(&block_group->lock);
|
||||
|
||||
printk(KERN_ERR "btrfs: failed to write free space cace "
|
||||
"for block group %llu\n", block_group->key.objectid);
|
||||
}
|
||||
|
||||
iput(inode);
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue