fs/bcachefs/compress.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_COMPRESS_H
   3 #define _BCACHEFS_COMPRESS_H
   4
   5 #include "extents_types.h"
   6
   7 static const unsigned __bch2_compression_opt_to_type[] = {
   8 #define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
   9         BCH_COMPRESSION_OPTS()
  10 #undef x
  11 };
  12
  13 struct bch_compression_opt {
  14         u8              type:4,
  15                         level:4;
  16 };
  17
  18 static inline struct bch_compression_opt __bch2_compression_decode(unsigned v)
  19 {
  20         return (struct bch_compression_opt) {
  21                 .type   = v & 15,
  22                 .level  = v >> 4,
  23         };
  24 }
  25
  26 static inline bool bch2_compression_opt_valid(unsigned v)
  27 {
  28         struct bch_compression_opt opt = __bch2_compression_decode(v);
  29
  30         return opt.type < ARRAY_SIZE(__bch2_compression_opt_to_type) && !(!opt.type && opt.level);
  31 }
  32
  33 static inline struct bch_compression_opt bch2_compression_decode(unsigned v)
  34 {
  35         return bch2_compression_opt_valid(v)
  36                 ? __bch2_compression_decode(v)
  37                 : (struct bch_compression_opt) { 0 };
  38 }
  39
  40 static inline unsigned bch2_compression_encode(struct bch_compression_opt opt)
  41 {
  42         return opt.type|(opt.level << 4);
  43 }
  44
  45 static inline enum bch_compression_type bch2_compression_opt_to_type(unsigned v)
  46 {
  47         return __bch2_compression_opt_to_type[bch2_compression_decode(v).type];
  48 }
  49
  50 int bch2_bio_uncompress_inplace(struct bch_fs *, struct bio *,
  51                                 struct bch_extent_crc_unpacked *);
  52 int bch2_bio_uncompress(struct bch_fs *, struct bio *, struct bio *,
  53                        struct bvec_iter, struct bch_extent_crc_unpacked);
  54 unsigned bch2_bio_compress(struct bch_fs *, struct bio *, size_t *,
  55                            struct bio *, size_t *, unsigned);
  56
  57 int bch2_check_set_has_compressed_data(struct bch_fs *, unsigned);
  58 void bch2_fs_compress_exit(struct bch_fs *);
  59 int bch2_fs_compress_init(struct bch_fs *);
  60
  61 void bch2_compression_opt_to_text(struct printbuf *, u64);
  62
  63 int bch2_opt_compression_parse(struct bch_fs *, const char *, u64 *, struct printbuf *);
  64 void bch2_opt_compression_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *, u64);
  65 int bch2_opt_compression_validate(u64, struct printbuf *);
  66
  67 #define bch2_opt_compression (struct bch_opt_fn) {              \
  68         .parse          = bch2_opt_compression_parse,           \
  69         .to_text        = bch2_opt_compression_to_text,         \
  70         .validate       = bch2_opt_compression_validate,        \
  71 }
  72
  73 #endif /* _BCACHEFS_COMPRESS_H */