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C++ btrfs_set_key_type函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中btrfs_set_key_type函数的典型用法代码示例。如果您正苦于以下问题：C++ btrfs_set_key_type函数的具体用法？C++ btrfs_set_key_type怎么用？C++ btrfs_set_key_type使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了btrfs_set_key_type函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: btrfs_set_key_type

static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
                                       u64 root_objectid, u32 generation)
{
    struct btrfs_root *root;
    struct inode *inode;
    struct btrfs_key key;

    key.objectid = root_objectid;
    btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
    key.offset = (u64)-1;

    root = btrfs_read_fs_root_no_name(btrfs_sb(sb)->fs_info, &key);
    if (IS_ERR(root))
        return ERR_CAST(root);

    key.objectid = objectid;
    btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
    key.offset = 0;

    inode = btrfs_iget(sb, &key, root, NULL);
    if (IS_ERR(inode))
        return (void *)inode;

    if (generation != inode->i_generation) {
        iput(inode);
        return ERR_PTR(-ESTALE);
    }

    return d_obtain_alias(inode);
}
开发者ID:johnny，项目名称:CobraDroidBeta，代码行数:30，代码来源:export.c


示例2: BTRFS_I

static struct dentry *btrfs_get_parent(struct dentry *child)
{
    struct inode *dir = child->d_inode;
    struct btrfs_root *root = BTRFS_I(dir)->root;
    struct btrfs_key key;
    struct btrfs_path *path;
    struct extent_buffer *leaf;
    int slot;
    u64 objectid;
    int ret;

    path = btrfs_alloc_path();

    key.objectid = dir->i_ino;
    btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
    key.offset = (u64)-1;

    ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
    if (ret < 0) {
        /* Error */
        btrfs_free_path(path);
        return ERR_PTR(ret);
    }
    leaf = path->nodes[0];
    slot = path->slots[0];
    if (ret) {
        /* btrfs_search_slot() returns the slot where we'd want to
           insert a backref for parent inode #0xFFFFFFFFFFFFFFFF.
           The _real_ backref, telling us what the parent inode
           _actually_ is, will be in the slot _before_ the one
           that btrfs_search_slot() returns. */
        if (!slot) {
            /* Unless there is _no_ key in the tree before... */
            btrfs_free_path(path);
            return ERR_PTR(-EIO);
        }
        slot--;
    }

    btrfs_item_key_to_cpu(leaf, &key, slot);
    btrfs_free_path(path);

    if (key.objectid != dir->i_ino || key.type != BTRFS_INODE_REF_KEY)
        return ERR_PTR(-EINVAL);

    objectid = key.offset;

    /* If we are already at the root of a subvol, return the real root */
    if (objectid == dir->i_ino)
        return dget(dir->i_sb->s_root);

    /* Build a new key for the inode item */
    key.objectid = objectid;
    btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
    key.offset = 0;

    return d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
}
开发者ID:johnny，项目名称:CobraDroidBeta，代码行数:58，代码来源:export.c


示例3: btrfs_insert_dir_item

int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
			  *root, char *name, int name_len, u64 dir,
			  struct btrfs_key *location, u8 type)
{
	int ret = 0;
	struct btrfs_path path;
	struct btrfs_dir_item *dir_item;
	char *name_ptr;
	struct btrfs_key key;
	u32 data_size;

	key.objectid = dir;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	if (name_len == 1 && *name == '.')
		key.offset = 1;
	else if (name_len == 2 && name[0] == '.' && name[1] == '.')
		key.offset = 2;
	else
		ret = btrfs_name_hash(name, name_len, &key.offset);
	BUG_ON(ret);
	btrfs_init_path(&path);
	data_size = sizeof(*dir_item) + name_len;
	dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
	if (!dir_item) {
		ret = -1;
		goto out;
	}
	btrfs_cpu_key_to_disk(&dir_item->location, location);
	btrfs_set_dir_type(dir_item, type);
	btrfs_set_dir_flags(dir_item, 0);
	btrfs_set_dir_name_len(dir_item, name_len);
	name_ptr = (char *)(dir_item + 1);
	memcpy(name_ptr, name, name_len);

	/* FIXME, use some real flag for selecting the extra index */
	if (root == root->fs_info->tree_root)
		goto out;

	btrfs_release_path(root, &path);
	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
	key.offset = location->objectid;
	dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
	if (!dir_item) {
		ret = -1;
		goto out;
	}
	btrfs_cpu_key_to_disk(&dir_item->location, location);
	btrfs_set_dir_type(dir_item, type);
	btrfs_set_dir_flags(dir_item, 0);
	btrfs_set_dir_name_len(dir_item, name_len);
	name_ptr = (char *)(dir_item + 1);
	memcpy(name_ptr, name, name_len);
out:
	btrfs_release_path(root, &path);
	return ret;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:57，代码来源:dir-item.c


示例4: btrfs_sb

static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
				       u64 root_objectid, u32 generation,
				       int check_generation)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
	struct btrfs_root *root;
	struct inode *inode;
	struct btrfs_key key;
	int index;
	int err = 0;

	if (objectid < BTRFS_FIRST_FREE_OBJECTID)
		return ERR_PTR(-ESTALE);

	key.objectid = root_objectid;
	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
	key.offset = (u64)-1;

	index = srcu_read_lock(&fs_info->subvol_srcu);

	root = btrfs_read_fs_root_no_name(fs_info, &key);
	if (IS_ERR(root)) {
		err = PTR_ERR(root);
		goto fail;
	}

	if (btrfs_root_refs(&root->root_item) == 0) {
		err = -ENOENT;
		goto fail;
	}

	key.objectid = objectid;
	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
	key.offset = 0;

	inode = btrfs_iget(sb, &key, root, NULL);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto fail;
	}

	srcu_read_unlock(&fs_info->subvol_srcu, index);

	if (check_generation && generation != inode->i_generation) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	return d_obtain_alias(inode);
fail:
	srcu_read_unlock(&fs_info->subvol_srcu, index);
	return ERR_PTR(err);
}
开发者ID:0xroot，项目名称:Blackphone-BP1-Kernel，代码行数:53，代码来源:export.c


示例5: btrfs_set_key_type

struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path, u64 dir,
					  const char *name, u16 name_len,
					  int mod)
{
	int ret;
	struct btrfs_key key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;
	struct btrfs_key found_key;
	struct extent_buffer *leaf;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);
	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	if (ret < 0)
		return ERR_PTR(ret);
	if (ret > 0) {
		if (path->slots[0] == 0)
			return NULL;
		path->slots[0]--;
	}

	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);

	if (found_key.objectid != dir ||
	    btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY ||
	    found_key.offset != key.offset)
		return NULL;

	return btrfs_match_dir_item_name(root, path, name, name_len);
}
开发者ID:12rafael，项目名称:jellytimekernel，代码行数:35，代码来源:dir-item.c


示例6: add_directory_items

static int add_directory_items(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, u64 objectid,
			       ino_t parent_inum, const char *name,
			       struct stat *st, int *dir_index_cnt)
{
	int ret;
	int name_len;
	struct btrfs_key location;
	u8 filetype = 0;

	name_len = strlen(name);

	location.objectid = objectid;
	location.offset = 0;
	btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);

	if (S_ISDIR(st->st_mode))
		filetype = BTRFS_FT_DIR;
	if (S_ISREG(st->st_mode))
		filetype = BTRFS_FT_REG_FILE;
	if (S_ISLNK(st->st_mode))
		filetype = BTRFS_FT_SYMLINK;

	ret = btrfs_insert_dir_item(trans, root, name, name_len,
				    parent_inum, &location,
				    filetype, index_cnt);

	*dir_index_cnt = index_cnt;
	index_cnt++;

	return ret;
}
开发者ID:kreijack，项目名称:btrfs-progs，代码行数:32，代码来源:mkfs.c


示例7: btrfs_del_orphan_item

int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, u64 offset)
{
	struct btrfs_path *path;
	struct btrfs_key key;
	int ret = 0;

	key.objectid = BTRFS_ORPHAN_OBJECTID;
	btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
	key.offset = offset;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
	if (ret)
		goto out;

	ret = btrfs_del_item(trans, root, path);

out:
	btrfs_free_path(path);
	return ret;
}
开发者ID:johnny，项目名称:CobraDroidBeta，代码行数:25，代码来源:orphan.c


示例8: inc_block_ref

static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
			 *root, u64 blocknr)
{
	struct btrfs_path path;
	int ret;
	struct btrfs_key key;
	struct btrfs_leaf *l;
	struct btrfs_extent_item *item;
	struct btrfs_key ins;
	u32 refs;

	find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1,
			 &ins);
	btrfs_init_path(&path);
	key.objectid = blocknr;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
	key.offset = 1;
	ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, &path,
				0, 1);
	if (ret != 0)
		BUG();
	BUG_ON(ret != 0);
	l = &path.nodes[0]->leaf;
	item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
	refs = btrfs_extent_refs(item);
	btrfs_set_extent_refs(item, refs + 1);

	BUG_ON(list_empty(&path.nodes[0]->dirty));
	btrfs_release_path(root->fs_info->extent_root, &path);
	finish_current_insert(trans, root->fs_info->extent_root);
	run_pending(trans, root->fs_info->extent_root);
	return 0;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:34，代码来源:extent-tree.c


示例9: finish_current_insert

static int finish_current_insert(struct btrfs_trans_handle *trans, struct
				 btrfs_root *extent_root)
{
	struct btrfs_key ins;
	struct btrfs_extent_item extent_item;
	unsigned int i;
	int ret;
	u64 super_blocks_used;
	struct btrfs_fs_info *info = extent_root->fs_info;

	btrfs_set_extent_refs(&extent_item, 1);
	btrfs_set_extent_owner(&extent_item, extent_root->root_key.objectid);
	ins.offset = 1;
	ins.flags = 0;
	btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);

	for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) {
		ins.objectid = extent_root->fs_info->current_insert.objectid +
				i;
		super_blocks_used = btrfs_super_blocks_used(info->disk_super);
		btrfs_set_super_blocks_used(info->disk_super,
					    super_blocks_used + 1);
		ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item,
					sizeof(extent_item));
		if (ret) {
			btrfs_print_tree(extent_root, extent_root->node);
		}
		BUG_ON(ret);
	}
	extent_root->fs_info->current_insert.offset = 0;
	return 0;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:32，代码来源:extent-tree.c


示例10: __free_extent

/*
 * remove an extent from the root, returns 0 on success
 */
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
			 *root, u64 blocknr, u64 num_blocks, int pin)
{
	struct btrfs_path path;
	struct btrfs_key key;
	struct btrfs_fs_info *info = root->fs_info;
	struct btrfs_root *extent_root = info->extent_root;
	int ret;
	struct btrfs_extent_item *ei;
	struct btrfs_key ins;
	u32 refs;

	BUG_ON(pin && num_blocks != 1);
	key.objectid = blocknr;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
	key.offset = num_blocks;

	find_free_extent(trans, root, 0, 0, (u64)-1, &ins);
	btrfs_init_path(&path);
	ret = btrfs_search_slot(trans, extent_root, &key, &path, -1, 1);
	if (ret) {
		btrfs_print_tree(extent_root, extent_root->node);
		printf("failed to find %llu\n",
		       (u64)key.objectid);
		BUG();
	}
	ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
			    struct btrfs_extent_item);
	BUG_ON(ei->refs == 0);
	refs = btrfs_extent_refs(ei) - 1;
	btrfs_set_extent_refs(ei, refs);
	if (refs == 0) {
		u64 super_blocks_used;
		if (pin) {
			int err;
			unsigned long bl = blocknr;
			radix_tree_preload(GFP_KERNEL);
			err = radix_tree_insert(&info->pinned_radix,
						blocknr, (void *)bl);
			BUG_ON(err);
			radix_tree_preload_end();
		}
		super_blocks_used = btrfs_super_blocks_used(info->disk_super);
		btrfs_set_super_blocks_used(info->disk_super,
					    super_blocks_used - num_blocks);
		ret = btrfs_del_item(trans, extent_root, &path);
		if (!pin && extent_root->fs_info->last_insert.objectid >
		    blocknr)
			extent_root->fs_info->last_insert.objectid = blocknr;
		if (ret)
			BUG();
		ret = update_block_group(trans, root, blocknr, num_blocks, 0);
		BUG_ON(ret);
	}
	btrfs_release_path(extent_root, &path);
	finish_current_insert(trans, extent_root);
	return ret;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:62，代码来源:extent-tree.c


示例11: btrfs_del_inode_ref

int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   const char *name, int name_len,
			   u64 inode_objectid, u64 ref_objectid, u64 *index)
{
	struct btrfs_path *path;
	struct btrfs_key key;
	struct btrfs_inode_ref *ref;
	struct extent_buffer *leaf;
	unsigned long ptr;
	unsigned long item_start;
	u32 item_size;
	u32 sub_item_len;
	int ret;
	int del_len = name_len + sizeof(*ref);

	key.objectid = inode_objectid;
	key.offset = ref_objectid;
	btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	path->leave_spinning = 1;

	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
	if (ret > 0) {
		ret = -ENOENT;
		goto out;
	} else if (ret < 0) {
		goto out;
	}
	if (!find_name_in_backref(path, name, name_len, &ref)) {
		ret = -ENOENT;
		goto out;
	}
	leaf = path->nodes[0];
	item_size = btrfs_item_size_nr(leaf, path->slots[0]);

	if (index)
		*index = btrfs_inode_ref_index(leaf, ref);

	if (del_len == item_size) {
		ret = btrfs_del_item(trans, root, path);
		goto out;
	}
	ptr = (unsigned long)ref;
	sub_item_len = name_len + sizeof(*ref);
	item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
	memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
			      item_size - (ptr + sub_item_len - item_start));
	btrfs_truncate_item(trans, root, path,
				  item_size - sub_item_len, 1);
out:
	btrfs_free_path(path);
	return ret;
}
开发者ID:0xroot，项目名称:Blackphone-BP1-Kernel，代码行数:58，代码来源:inode-item.c


示例12: btrfs_check_dir_item_collision

int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
				   const char *name, int name_len)
{
	int ret;
	struct btrfs_key key;
	struct btrfs_dir_item *di;
	int data_size;
	struct extent_buffer *leaf;
	int slot;
	struct btrfs_path *path;


	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);

	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);

	/* return back any errors */
	if (ret < 0)
		goto out;

	/* nothing found, we're safe */
	if (ret > 0) {
		ret = 0;
		goto out;
	}

	/* we found an item, look for our name in the item */
	di = btrfs_match_dir_item_name(root, path, name, name_len);
	if (di) {
		/* our exact name was found */
		ret = -EEXIST;
		goto out;
	}

	/*
	 * see if there is room in the item to insert this
	 * name
	 */
	data_size = sizeof(*di) + name_len;
	leaf = path->nodes[0];
	slot = path->slots[0];
	if (data_size + btrfs_item_size_nr(leaf, slot) +
	    sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root)) {
		ret = -EOVERFLOW;
	} else {
		/* plenty of insertion room */
		ret = 0;
	}
out:
	btrfs_free_path(path);
	return ret;
}
开发者ID:u9621071，项目名称:kernel-uek-UEK3，代码行数:58，代码来源:dir-item.c


示例13: create_pending_snapshot

/*
 * new snapshots need to be created at a very specific time in the
 * transaction commit.  This does the actual creation
 */
static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info,
				   struct btrfs_pending_snapshot *pending)
{
	struct btrfs_key key;
	struct btrfs_root_item *new_root_item;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_root *root = pending->root;
	struct extent_buffer *tmp;
	struct extent_buffer *old;
	int ret;
	u64 objectid;

	new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
	if (!new_root_item) {
		ret = -ENOMEM;
		goto fail;
	}
	ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid);
	if (ret)
		goto fail;

	record_root_in_trans(trans, root);
	btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
	memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));

	key.objectid = objectid;
	/* record when the snapshot was created in key.offset */
	key.offset = trans->transid;
	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);

	old = btrfs_lock_root_node(root);
	btrfs_cow_block(trans, root, old, NULL, 0, &old);
	btrfs_set_lock_blocking(old);

	btrfs_copy_root(trans, root, old, &tmp, objectid);
	btrfs_tree_unlock(old);
	free_extent_buffer(old);

	btrfs_set_root_node(new_root_item, tmp);
	ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
				new_root_item);
	btrfs_tree_unlock(tmp);
	free_extent_buffer(tmp);
	if (ret)
		goto fail;

	key.offset = (u64)-1;
	memcpy(&pending->root_key, &key, sizeof(key));
fail:
	kfree(new_root_item);
	btrfs_unreserve_metadata_space(root, 6);
	return ret;
}
开发者ID:laudarch，项目名称:simcom-linux-kernel，代码行数:58，代码来源:transaction.c


示例14: btrfs_insert_xattr_item

/*
 * xattrs work a lot like directories, this inserts an xattr item
 * into the tree
 */
int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root, const char *name,
			    u16 name_len, const void *data, u16 data_len,
			    u64 dir)
{
	int ret = 0;
	struct btrfs_path *path;
	struct btrfs_dir_item *dir_item;
	unsigned long name_ptr, data_ptr;
	struct btrfs_key key, location;
	struct btrfs_disk_key disk_key;
	struct extent_buffer *leaf;
	u32 data_size;

	key.objectid = dir;
	btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
	key.offset = btrfs_name_hash(name, name_len);
	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	if (name_len + data_len + sizeof(struct btrfs_dir_item) >
	    BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item))
		return -ENOSPC;

	data_size = sizeof(*dir_item) + name_len + data_len;
	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
					name, name_len);
	/*
	 * FIXME: at some point we should handle xattr's that are larger than
	 * what we can fit in our leaf.  We set location to NULL b/c we arent
	 * pointing at anything else, that will change if we store the xattr
	 * data in a separate inode.
	 */
	BUG_ON(IS_ERR(dir_item));
	memset(&location, 0, sizeof(location));

	leaf = path->nodes[0];
	btrfs_cpu_key_to_disk(&disk_key, &location);
	btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
	btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
	btrfs_set_dir_name_len(leaf, dir_item, name_len);
	btrfs_set_dir_transid(leaf, dir_item, trans->transid);
	btrfs_set_dir_data_len(leaf, dir_item, data_len);
	name_ptr = (unsigned long)(dir_item + 1);
	data_ptr = (unsigned long)((char *)name_ptr + name_len);

	write_extent_buffer(leaf, name, name_ptr, name_len);
	write_extent_buffer(leaf, data, data_ptr, data_len);
	btrfs_mark_buffer_dirty(path->nodes[0]);

	btrfs_free_path(path);
	return ret;
}
开发者ID:325116067，项目名称:semc-qsd8x50，代码行数:57，代码来源:dir-item.c


示例15: btrfs_read_block_groups

int btrfs_read_block_groups(struct btrfs_root *root)
{
	struct btrfs_path path;
	int ret;
	int err = 0;
	struct btrfs_block_group_item *bi;
	struct btrfs_block_group_cache *cache;
	struct btrfs_key key;
	struct btrfs_key found_key;
	struct btrfs_leaf *leaf;
	u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize;

	root = root->fs_info->extent_root;
	key.objectid = 0;
	key.offset = group_size_blocks;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
	btrfs_init_path(&path);

	while(1) {
		ret = btrfs_search_slot(NULL, root->fs_info->extent_root,
					&key, &path, 0, 0);
		if (ret != 0) {
			err = ret;
			break;
		}
		leaf = &path.nodes[0]->leaf;
		btrfs_disk_key_to_cpu(&found_key,
				      &leaf->items[path.slots[0]].key);
		cache = malloc(sizeof(*cache));
		if (!cache) {
			err = -1;
			break;
		}
		bi = btrfs_item_ptr(leaf, path.slots[0],
				    struct btrfs_block_group_item);
		memcpy(&cache->item, bi, sizeof(*bi));
		memcpy(&cache->key, &found_key, sizeof(found_key));
		key.objectid = found_key.objectid + found_key.offset;
		btrfs_release_path(root, &path);
		ret = radix_tree_insert(&root->fs_info->block_group_radix,
					found_key.objectid +
					found_key.offset - 1, (void *)cache);
		BUG_ON(ret);
		if (key.objectid >=
		    btrfs_super_total_blocks(root->fs_info->disk_super))
			break;
	}
	btrfs_release_path(root, &path);
	return 0;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:51，代码来源:extent-tree.c


示例16: btrfs_lookup_csum

static struct btrfs_csum_item *
btrfs_lookup_csum(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct btrfs_path *path,
                  u64 bytenr, int cow)
{
    int ret;
    struct btrfs_key file_key;
    struct btrfs_key found_key;
    struct btrfs_csum_item *item;
    struct extent_buffer *leaf;
    u64 csum_offset = 0;
    u16 csum_size =
        btrfs_super_csum_size(root->fs_info->super_copy);
    int csums_in_item;

    file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
    file_key.offset = bytenr;
    btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
    ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
    if (ret < 0)
        goto fail;
    leaf = path->nodes[0];
    if (ret > 0) {
        ret = 1;
        if (path->slots[0] == 0)
            goto fail;
        path->slots[0]--;
        btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
        if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
            goto fail;

        csum_offset = (bytenr - found_key.offset) / root->sectorsize;
        csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
        csums_in_item /= csum_size;

        if (csum_offset >= csums_in_item) {
            ret = -EFBIG;
            goto fail;
        }
    }
    item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
    item = (struct btrfs_csum_item *)((unsigned char *)item +
                                      csum_offset * csum_size);
    return item;
fail:
    if (ret > 0)
        ret = -ENOENT;
    return ERR_PTR(ret);
}
开发者ID:JKDingwall，项目名称:btrfs-progs，代码行数:50，代码来源:file-item.c


示例17: btrfs_lookup_file_extent

int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid,
			     u64 offset, int mod)
{
	int ret;
	struct btrfs_key file_key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;

	file_key.objectid = objectid;
	file_key.offset = offset;
	btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
	ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
	return ret;
}
开发者ID:ebichu，项目名称:dd-wrt，代码行数:16，代码来源:file-item.c


示例18: btrfs_lookup_dir_item

int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
			  *root, struct btrfs_path *path, u64 dir, char *name,
			  int name_len, int mod)
{
	int ret;
	struct btrfs_key key;
	int ins_len = mod < 0 ? -1 : 0;
	int cow = mod != 0;

	key.objectid = dir;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	ret = btrfs_name_hash(name, name_len, &key.offset);
	BUG_ON(ret);
	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
	return ret;
}
开发者ID:sharpglasses，项目名称:ServerSkeleton，代码行数:17，代码来源:dir-item.c


示例19: btrfs_insert_inline_extent

int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, u64 objectid,
			       u64 offset, char *buffer, size_t size)
{
	struct btrfs_key key;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	unsigned long ptr;
	struct btrfs_file_extent_item *ei;
	u32 datasize;
	int err = 0;
	int ret;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = objectid;
	key.offset = offset;
	btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);

	datasize = btrfs_file_extent_calc_inline_size(size);
	ret = btrfs_insert_empty_item(trans, root, path, &key, datasize);
	if (ret) {
		err = ret;
		goto fail;
	}

	leaf = path->nodes[0];
	ei = btrfs_item_ptr(leaf, path->slots[0],
			    struct btrfs_file_extent_item);
	btrfs_set_file_extent_generation(leaf, ei, trans->transid);
	btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
	btrfs_set_file_extent_ram_bytes(leaf, ei, size);
	btrfs_set_file_extent_compression(leaf, ei, 0);
	btrfs_set_file_extent_encryption(leaf, ei, 0);
	btrfs_set_file_extent_other_encoding(leaf, ei, 0);

	ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
	write_extent_buffer(leaf, buffer, ptr, size);
	btrfs_mark_buffer_dirty(leaf);
fail:
	btrfs_free_path(path);
	return err;
}
开发者ID:ebichu，项目名称:dd-wrt，代码行数:45，代码来源:file-item.c


示例20: btrfs_insert_file_extent

int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     u64 objectid, u64 pos,
			     u64 disk_offset, u64 disk_num_bytes,
			     u64 num_bytes, u64 offset, u64 ram_bytes,
			     u8 compression, u8 encryption, u16 other_encoding)
{
	int ret = 0;
	struct btrfs_file_extent_item *item;
	struct btrfs_key file_key;
	struct btrfs_path *path;
	struct extent_buffer *leaf;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	file_key.objectid = objectid;
	file_key.offset = pos;
	btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);

	path->leave_spinning = 1;
	ret = btrfs_insert_empty_item(trans, root, path, &file_key,
				      sizeof(*item));
	if (ret < 0)
		goto out;
	BUG_ON(ret); /* Can't happen */
	leaf = path->nodes[0];
	item = btrfs_item_ptr(leaf, path->slots[0],
			      struct btrfs_file_extent_item);
	btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
	btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
	btrfs_set_file_extent_offset(leaf, item, offset);
	btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
	btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
	btrfs_set_file_extent_generation(leaf, item, trans->transid);
	btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
	btrfs_set_file_extent_compression(leaf, item, compression);
	btrfs_set_file_extent_encryption(leaf, item, encryption);
	btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);

	btrfs_mark_buffer_dirty(leaf);
out:
	btrfs_free_path(path);
	return ret;
}
开发者ID:0xroot，项目名称:Blackphone-BP1-Kernel，代码行数:45，代码来源:file-item.c



注：本文中的btrfs_set_key_type函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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