LXR uboot/fs/btrfs/extent-io.h

   1// SPDX-License-Identifier: GPL-2.0+
   2
   3/*
   4 * Crossported from btrfs-progs/extent_io.h
   5 *
   6 * Modification includes:
   7 * - extent_buffer:data
   8 *   Use pointer to provide better alignment.
   9 * - Remove max_cache_size related interfaces
  10 *   Includes free_extent_buffer_nocache()
  11 *   As we don't cache eb in U-boot.
  12 * - Include headers
  13 *
  14 * Write related functions are kept as we still need to modify dummy extent
  15 * buffers even in RO environment.
  16 */
  17#ifndef __BTRFS_EXTENT_IO_H__
  18#define __BTRFS_EXTENT_IO_H__
  19
  20#include <linux/types.h>
  21#include <linux/list.h>
  22#include <linux/err.h>
  23#include <linux/bitops.h>
  24#include <fs_internal.h>
  25#include "extent-cache.h"
  26
  27#define EXTENT_DIRTY            (1U << 0)
  28#define EXTENT_WRITEBACK        (1U << 1)
  29#define EXTENT_UPTODATE         (1U << 2)
  30#define EXTENT_LOCKED           (1U << 3)
  31#define EXTENT_NEW              (1U << 4)
  32#define EXTENT_DELALLOC         (1U << 5)
  33#define EXTENT_DEFRAG           (1U << 6)
  34#define EXTENT_DEFRAG_DONE      (1U << 7)
  35#define EXTENT_BUFFER_FILLED    (1U << 8)
  36#define EXTENT_CSUM             (1U << 9)
  37#define EXTENT_BAD_TRANSID      (1U << 10)
  38#define EXTENT_BUFFER_DUMMY     (1U << 11)
  39#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  40
  41#define BLOCK_GROUP_DATA        (1U << 1)
  42#define BLOCK_GROUP_METADATA    (1U << 2)
  43#define BLOCK_GROUP_SYSTEM      (1U << 4)
  44
  45/*
  46 * The extent buffer bitmap operations are done with byte granularity instead of
  47 * word granularity for two reasons:
  48 * 1. The bitmaps must be little-endian on disk.
  49 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
  50 *    single word in a bitmap may straddle two pages in the extent buffer.
  51 */
  52#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
  53#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
  54#define BITMAP_FIRST_BYTE_MASK(start) \
  55        ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
  56#define BITMAP_LAST_BYTE_MASK(nbits) \
  57        (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
  58
  59static inline int le_test_bit(int nr, const u8 *addr)
  60{
  61        return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
  62}
  63
  64struct btrfs_fs_info;
  65
  66struct extent_io_tree {
  67        struct cache_tree state;
  68        struct cache_tree cache;
  69        u64 cache_size;
  70};
  71
  72struct extent_state {
  73        struct cache_extent cache_node;
  74        u64 start;
  75        u64 end;
  76        int refs;
  77        unsigned long state;
  78        u64 xprivate;
  79};
  80
  81struct extent_buffer {
  82        struct cache_extent cache_node;
  83        u64 start;
  84        u32 len;
  85        int refs;
  86        u32 flags;
  87        struct btrfs_fs_info *fs_info;
  88        char *data;
  89};
  90
  91static inline void extent_buffer_get(struct extent_buffer *eb)
  92{
  93        eb->refs++;
  94}
  95
  96void extent_io_tree_init(struct extent_io_tree *tree);
  97void extent_io_tree_cleanup(struct extent_io_tree *tree);
  98int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
  99int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 100int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 101                          u64 *start_ret, u64 *end_ret, int bits);
 102int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 103                   int bits, int filled);
 104int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 105int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 106static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
 107{
 108        eb->flags |= EXTENT_UPTODATE;
 109        return 0;
 110}
 111
 112static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
 113{
 114        eb->flags &= ~EXTENT_UPTODATE;
 115        return 0;
 116}
 117
 118static inline int extent_buffer_uptodate(struct extent_buffer *eb)
 119{
 120        if (!eb || IS_ERR(eb))
 121                return 0;
 122        if (eb->flags & EXTENT_UPTODATE)
 123                return 1;
 124        return 0;
 125}
 126
 127int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
 128int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
 129struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 130                                         u64 bytenr, u32 blocksize);
 131struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
 132                                               u64 start);
 133struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 134                                          u64 bytenr, u32 blocksize);
 135struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 136struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 137                                                u64 bytenr, u32 blocksize);
 138void free_extent_buffer(struct extent_buffer *eb);
 139int read_extent_from_disk(struct blk_desc *desc, struct disk_partition *part,
 140                          u64 physical, struct extent_buffer *eb,
 141                          unsigned long offset, unsigned long len);
 142int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 143                         unsigned long start, unsigned long len);
 144void read_extent_buffer(const struct extent_buffer *eb, void *dst,
 145                        unsigned long start, unsigned long len);
 146void write_extent_buffer(struct extent_buffer *eb, const void *src,
 147                         unsigned long start, unsigned long len);
 148void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 149                        unsigned long dst_offset, unsigned long src_offset,
 150                        unsigned long len);
 151void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 152                           unsigned long src_offset, unsigned long len);
 153void memset_extent_buffer(struct extent_buffer *eb, char c,
 154                          unsigned long start, unsigned long len);
 155int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 156                           unsigned long nr);
 157int set_extent_buffer_dirty(struct extent_buffer *eb);
 158int clear_extent_buffer_dirty(struct extent_buffer *eb);
 159void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 160                                unsigned long pos, unsigned long len);
 161void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 162                              unsigned long pos, unsigned long len);
 163
 164#endif
 165