linux-stable/fs/bcachefs/varint.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_VARINT_H
#define _BCACHEFS_VARINT_H

int bch2_varint_encode(u8 *, u64);
int bch2_varint_decode(const u8 *, const u8 *, u64 *);

int bch2_varint_encode_fast(u8 *, u64);
int bch2_varint_decode_fast(const u8 *, const u8 *, u64 *);

#endif /* _BCACHEFS_VARINT_H */
bcachefs: New varints Previous varint implementation used by the inode code was not nearly as fast as it could have been; partly because it was attempting to encode integers up to 96 bits (for timestamps) but this meant that encoding and decoding the length required a table lookup. Instead, we'll just encode timestamps greater than 64 bits as two separate varints; this will make decoding/encoding of inodes significantly faster overall. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> 2020-11-06 04:39:33 +00:00			`/* SPDX-License-Identifier: GPL-2.0 */`
			`#ifndef _BCACHEFS_VARINT_H`
			`#define _BCACHEFS_VARINT_H`

			`int bch2_varint_encode(u8 *, u64);`
			`int bch2_varint_decode(const u8 , const u8 , u64 *);`

bcachefs: Add safe versions of varint encode/decode This adds safe versions of bch2_varint_(encode\|decode) that don't read or write past the end of the buffer, or varint being encoded. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> 2021-07-13 20:03:51 +00:00			`int bch2_varint_encode_fast(u8 *, u64);`
			`int bch2_varint_decode_fast(const u8 , const u8 , u64 *);`

bcachefs: New varints Previous varint implementation used by the inode code was not nearly as fast as it could have been; partly because it was attempting to encode integers up to 96 bits (for timestamps) but this meant that encoding and decoding the length required a table lookup. Instead, we'll just encode timestamps greater than 64 bits as two separate varints; this will make decoding/encoding of inodes significantly faster overall. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> 2020-11-06 04:39:33 +00:00			`#endif /* _BCACHEFS_VARINT_H */`