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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BTRFS_FILE_ITEM_H
#define BTRFS_FILE_ITEM_H
#include "kerncompat.h"
#include <stdbool.h>
#include <stddef.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/uapi/btrfs_tree.h"
#include "kernel-shared/accessors.h"
#include "kernel-shared/compression.h"
struct extent_map;
struct bio;
struct inode;
struct btrfs_trans_handle;
struct btrfs_ordered_sum;
struct btrfs_inode;
struct extent_buffer;
struct list_head;
#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
(offsetof(struct btrfs_file_extent_item, disk_bytenr))
static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
{
return BTRFS_MAX_ITEM_SIZE(info) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
}
/*
* Return the number of bytes used by the item on disk, minus the size of any
* extent headers. If a file is compressed on disk, this is the compressed
* size.
*/
static inline u32 btrfs_file_extent_inline_item_len(
const struct extent_buffer *eb,
int nr)
{
return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
}
static inline unsigned long btrfs_file_extent_inline_start(
const struct btrfs_file_extent_item *e)
{
return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
}
static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
{
return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
}
int btrfs_del_csums(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr, u64 len);
int btrfs_lookup_bio_sums(struct btrfs_bio *bbio);
int btrfs_insert_hole_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid, u64 pos,
u64 num_bytes);
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 objectid,
u64 bytenr, int mod);
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_ordered_sum *sums);
int btrfs_csum_one_bio(struct btrfs_bio *bbio);
int btrfs_alloc_dummy_sum(struct btrfs_bio *bbio);
int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
struct list_head *list, int search_commit,
bool nowait);
int btrfs_lookup_csums_list(struct btrfs_root *root, u64 start, u64 end,
struct list_head *list, bool nowait);
int btrfs_lookup_csums_bitmap(struct btrfs_root *root, struct btrfs_path *path,
u64 start, u64 end, u8 *csum_buf,
unsigned long *csum_bitmap);
void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
const struct btrfs_path *path,
const struct btrfs_file_extent_item *fi,
struct extent_map *em);
int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
u64 len);
int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, u64 len);
void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
u64 btrfs_file_extent_end(const struct btrfs_path *path);
/*
* MODIFIED:
* - This function doesn't exist in the kernel.
*/
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 ino, u64 file_pos,
struct btrfs_file_extent_item *stack_fi);
int btrfs_csum_file_block(struct btrfs_trans_handle *trans, u64 logical,
u64 csum_objectid, u32 csum_type, const char *data);
struct btrfs_csum_item *
btrfs_lookup_csum(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr, u64 csum_objectid, u16 csum_type, int cow);
int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid,
u64 offset, const char *buffer, size_t size,
enum btrfs_compression_type comp, u64 ram_bytes);
/*
* For symlink we allow up to PATH_MAX - 1 (PATH_MAX includes the terminating NUL,
* but fs doesn't store that terminating NUL).
*
* But for inlined data extents, the up limit is sectorsize - 1 (inclusive), or a
* regular extent should be created instead.
*/
static inline u32 btrfs_symlink_max_size(struct btrfs_fs_info *fs_info)
{
return min_t(u32, BTRFS_MAX_INLINE_DATA_SIZE(fs_info),
PATH_MAX - 1);
}
static inline u32 btrfs_data_inline_max_size(struct btrfs_fs_info *fs_info)
{
return min_t(u32, BTRFS_MAX_INLINE_DATA_SIZE(fs_info),
fs_info->sectorsize - 1);
}
#endif
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