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