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4f564f4f9f
bounds checking helper, since compression types are extensible Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_COMPRESS_H
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#define _BCACHEFS_COMPRESS_H
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#include "extents_types.h"
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static const unsigned __bch2_compression_opt_to_type[] = {
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#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
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BCH_COMPRESSION_OPTS()
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#undef x
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};
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struct bch_compression_opt {
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u8 type:4,
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level:4;
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};
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static inline struct bch_compression_opt __bch2_compression_decode(unsigned v)
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{
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return (struct bch_compression_opt) {
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.type = v & 15,
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.level = v >> 4,
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};
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}
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static inline bool bch2_compression_opt_valid(unsigned v)
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{
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struct bch_compression_opt opt = __bch2_compression_decode(v);
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return opt.type < ARRAY_SIZE(__bch2_compression_opt_to_type) && !(!opt.type && opt.level);
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}
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static inline struct bch_compression_opt bch2_compression_decode(unsigned v)
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{
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return bch2_compression_opt_valid(v)
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? __bch2_compression_decode(v)
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: (struct bch_compression_opt) { 0 };
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}
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static inline unsigned bch2_compression_encode(struct bch_compression_opt opt)
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{
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return opt.type|(opt.level << 4);
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}
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static inline enum bch_compression_type bch2_compression_opt_to_type(unsigned v)
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{
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return __bch2_compression_opt_to_type[bch2_compression_decode(v).type];
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}
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static inline void bch2_prt_compression_type(struct printbuf *out, enum bch_compression_type type)
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{
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if (type < BCH_COMPRESSION_TYPE_NR)
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prt_str(out, __bch2_compression_types[type]);
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else
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prt_printf(out, "(invalid compression type %u)", type);
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}
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int bch2_bio_uncompress_inplace(struct bch_fs *, struct bio *,
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struct bch_extent_crc_unpacked *);
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int bch2_bio_uncompress(struct bch_fs *, struct bio *, struct bio *,
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struct bvec_iter, struct bch_extent_crc_unpacked);
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unsigned bch2_bio_compress(struct bch_fs *, struct bio *, size_t *,
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struct bio *, size_t *, unsigned);
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int bch2_check_set_has_compressed_data(struct bch_fs *, unsigned);
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void bch2_fs_compress_exit(struct bch_fs *);
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int bch2_fs_compress_init(struct bch_fs *);
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void bch2_compression_opt_to_text(struct printbuf *, u64);
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int bch2_opt_compression_parse(struct bch_fs *, const char *, u64 *, struct printbuf *);
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void bch2_opt_compression_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *, u64);
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int bch2_opt_compression_validate(u64, struct printbuf *);
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#define bch2_opt_compression (struct bch_opt_fn) { \
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.parse = bch2_opt_compression_parse, \
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.to_text = bch2_opt_compression_to_text, \
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.validate = bch2_opt_compression_validate, \
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}
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#endif /* _BCACHEFS_COMPRESS_H */
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