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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:37 +0000 |
commit | 94ac2ab3fff96814d7460a27a0e9d004abbd4128 (patch) | |
tree | 9a4eb8cc234b540b0f4b93363109cdd37a20540b /drivers/md/dm-vdo/indexer/hash-utils.h | |
parent | Adding debian version 6.8.12-1. (diff) | |
download | linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.tar.xz linux-94ac2ab3fff96814d7460a27a0e9d004abbd4128.zip |
Merging upstream version 6.9.2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/md/dm-vdo/indexer/hash-utils.h')
-rw-r--r-- | drivers/md/dm-vdo/indexer/hash-utils.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/indexer/hash-utils.h b/drivers/md/dm-vdo/indexer/hash-utils.h new file mode 100644 index 0000000000..6a8dd8ffea --- /dev/null +++ b/drivers/md/dm-vdo/indexer/hash-utils.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2023 Red Hat + */ + +#ifndef UDS_HASH_UTILS_H +#define UDS_HASH_UTILS_H + +#include "numeric.h" + +#include "geometry.h" +#include "indexer.h" + +/* Utilities for extracting portions of a request name for various uses. */ + +/* How various portions of a record name are apportioned. */ +enum { + VOLUME_INDEX_BYTES_OFFSET = 0, + VOLUME_INDEX_BYTES_COUNT = 8, + CHAPTER_INDEX_BYTES_OFFSET = 8, + CHAPTER_INDEX_BYTES_COUNT = 6, + SAMPLE_BYTES_OFFSET = 14, + SAMPLE_BYTES_COUNT = 2, +}; + +static inline u64 uds_extract_chapter_index_bytes(const struct uds_record_name *name) +{ + const u8 *chapter_bits = &name->name[CHAPTER_INDEX_BYTES_OFFSET]; + u64 bytes = (u64) get_unaligned_be16(chapter_bits) << 32; + + bytes |= get_unaligned_be32(chapter_bits + 2); + return bytes; +} + +static inline u64 uds_extract_volume_index_bytes(const struct uds_record_name *name) +{ + return get_unaligned_be64(&name->name[VOLUME_INDEX_BYTES_OFFSET]); +} + +static inline u32 uds_extract_sampling_bytes(const struct uds_record_name *name) +{ + return get_unaligned_be16(&name->name[SAMPLE_BYTES_OFFSET]); +} + +/* Compute the chapter delta list for a given name. */ +static inline u32 uds_hash_to_chapter_delta_list(const struct uds_record_name *name, + const struct index_geometry *geometry) +{ + return ((uds_extract_chapter_index_bytes(name) >> geometry->chapter_address_bits) & + ((1 << geometry->chapter_delta_list_bits) - 1)); +} + +/* Compute the chapter delta address for a given name. */ +static inline u32 uds_hash_to_chapter_delta_address(const struct uds_record_name *name, + const struct index_geometry *geometry) +{ + return uds_extract_chapter_index_bytes(name) & ((1 << geometry->chapter_address_bits) - 1); +} + +static inline unsigned int uds_name_to_hash_slot(const struct uds_record_name *name, + unsigned int slot_count) +{ + return (unsigned int) (uds_extract_chapter_index_bytes(name) % slot_count); +} + +#endif /* UDS_HASH_UTILS_H */ |