165 lines
5.4 KiB
C
165 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Crossported from btrfs-progs/extent_io.h
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*
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* Modification includes:
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* - extent_buffer:data
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* Use pointer to provide better alignment.
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* - Remove max_cache_size related interfaces
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* Includes free_extent_buffer_nocache()
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* As we don't cache eb in U-boot.
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* - Include headers
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*
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* Write related functions are kept as we still need to modify dummy extent
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* buffers even in RO environment.
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*/
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#ifndef __BTRFS_EXTENT_IO_H__
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#define __BTRFS_EXTENT_IO_H__
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/bitops.h>
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#include <fs_internal.h>
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#include "extent-cache.h"
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#define EXTENT_DIRTY (1U << 0)
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#define EXTENT_WRITEBACK (1U << 1)
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#define EXTENT_UPTODATE (1U << 2)
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#define EXTENT_LOCKED (1U << 3)
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#define EXTENT_NEW (1U << 4)
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#define EXTENT_DELALLOC (1U << 5)
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#define EXTENT_DEFRAG (1U << 6)
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#define EXTENT_DEFRAG_DONE (1U << 7)
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#define EXTENT_BUFFER_FILLED (1U << 8)
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#define EXTENT_CSUM (1U << 9)
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#define EXTENT_BAD_TRANSID (1U << 10)
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#define EXTENT_BUFFER_DUMMY (1U << 11)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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#define BLOCK_GROUP_DATA (1U << 1)
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#define BLOCK_GROUP_METADATA (1U << 2)
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#define BLOCK_GROUP_SYSTEM (1U << 4)
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/*
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* The extent buffer bitmap operations are done with byte granularity instead of
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* word granularity for two reasons:
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* 1. The bitmaps must be little-endian on disk.
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* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
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* single word in a bitmap may straddle two pages in the extent buffer.
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*/
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
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#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
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#define BITMAP_FIRST_BYTE_MASK(start) \
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((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
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#define BITMAP_LAST_BYTE_MASK(nbits) \
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(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
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static inline int le_test_bit(int nr, const u8 *addr)
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{
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return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
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}
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struct btrfs_fs_info;
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struct extent_io_tree {
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struct cache_tree state;
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struct cache_tree cache;
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u64 cache_size;
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};
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struct extent_state {
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struct cache_extent cache_node;
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u64 start;
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u64 end;
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int refs;
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unsigned long state;
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u64 xprivate;
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};
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struct extent_buffer {
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struct cache_extent cache_node;
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u64 start;
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u32 len;
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int refs;
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u32 flags;
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struct btrfs_fs_info *fs_info;
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char *data;
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};
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static inline void extent_buffer_get(struct extent_buffer *eb)
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{
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eb->refs++;
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}
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void extent_io_tree_init(struct extent_io_tree *tree);
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void extent_io_tree_cleanup(struct extent_io_tree *tree);
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int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
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int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
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int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
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u64 *start_ret, u64 *end_ret, int bits);
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int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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int bits, int filled);
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int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
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int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
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static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
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{
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eb->flags |= EXTENT_UPTODATE;
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return 0;
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}
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static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
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{
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eb->flags &= ~EXTENT_UPTODATE;
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return 0;
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}
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static inline int extent_buffer_uptodate(struct extent_buffer *eb)
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{
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if (!eb || IS_ERR(eb))
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return 0;
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if (eb->flags & EXTENT_UPTODATE)
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return 1;
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return 0;
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}
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int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
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int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
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struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
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u64 bytenr, u32 blocksize);
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struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
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u64 start);
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize);
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struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize);
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void free_extent_buffer(struct extent_buffer *eb);
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int read_extent_from_disk(struct blk_desc *desc, struct disk_partition *part,
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u64 physical, struct extent_buffer *eb,
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unsigned long offset, unsigned long len);
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int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
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unsigned long start, unsigned long len);
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void read_extent_buffer(const struct extent_buffer *eb, void *dst,
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unsigned long start, unsigned long len);
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void write_extent_buffer(struct extent_buffer *eb, const void *src,
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unsigned long start, unsigned long len);
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void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memset_extent_buffer(struct extent_buffer *eb, char c,
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unsigned long start, unsigned long len);
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int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
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unsigned long nr);
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int set_extent_buffer_dirty(struct extent_buffer *eb);
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int clear_extent_buffer_dirty(struct extent_buffer *eb);
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void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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#endif
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