linux/fs/btrfs/inode-item.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 */

#include "ctree.h"
#include "fs.h"
#include "messages.h"
#include "inode-item.h"
#include "disk-io.h"
#include "transaction.h"
#include "space-info.h"
#include "accessors.h"
#include "extent-tree.h"
#include "file-item.h"

struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
						   int slot,
						   const struct fscrypt_str *name)
{ … }

struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
		struct extent_buffer *leaf, int slot, u64 ref_objectid,
		const struct fscrypt_str *name)
{ … }

/* Returns NULL if no extref found */
struct btrfs_inode_extref *
btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root,
			  struct btrfs_path *path,
			  const struct fscrypt_str *name,
			  u64 inode_objectid, u64 ref_objectid, int ins_len,
			  int cow)
{ … }

static int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
				  struct btrfs_root *root,
				  const struct fscrypt_str *name,
				  u64 inode_objectid, u64 ref_objectid,
				  u64 *index)
{ … }

int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
			struct btrfs_root *root, const struct fscrypt_str *name,
			u64 inode_objectid, u64 ref_objectid, u64 *index)
{ … }

/*
 * Insert an extended inode ref into a tree.
 *
 * The caller must have checked against BTRFS_LINK_MAX already.
 */
static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
				     struct btrfs_root *root,
				     const struct fscrypt_str *name,
				     u64 inode_objectid, u64 ref_objectid,
				     u64 index)
{ … }

/* Will return 0, -ENOMEM, -EMLINK, or -EEXIST or anything from the CoW path */
int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, const struct fscrypt_str *name,
			   u64 inode_objectid, u64 ref_objectid, u64 index)
{ … }

int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid)
{ … }

int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
		       *root, struct btrfs_path *path,
		       struct btrfs_key *location, int mod)
{ … }

static inline void btrfs_trace_truncate(struct btrfs_inode *inode,
					struct extent_buffer *leaf,
					struct btrfs_file_extent_item *fi,
					u64 offset, int extent_type, int slot)
{ … }

/*
 * Remove inode items from a given root.
 *
 * @trans:		A transaction handle.
 * @root:		The root from which to remove items.
 * @inode:		The inode whose items we want to remove.
 * @control:		The btrfs_truncate_control to control how and what we
 *			are truncating.
 *
 * Remove all keys associated with the inode from the given root that have a key
 * with a type greater than or equals to @min_type. When @min_type has a value of
 * BTRFS_EXTENT_DATA_KEY, only remove file extent items that have an offset value
 * greater than or equals to @new_size. If a file extent item that starts before
 * @new_size and ends after it is found, its length is adjusted.
 *
 * Returns: 0 on success, < 0 on error and NEED_TRUNCATE_BLOCK when @min_type is
 * BTRFS_EXTENT_DATA_KEY and the caller must truncate the last block.
 */
int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root,
			       struct btrfs_truncate_control *control)
{ … }