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