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a4e11cea27
We've got a problem with bch_stripe that is going to take an on disk format rev to fix - we can't access the block sector counts if the checksum type is unknown. Document it for now, there are a few other things to fix as well. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_EC_FORMAT_H
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#define _BCACHEFS_EC_FORMAT_H
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struct bch_stripe {
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struct bch_val v;
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__le16 sectors;
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__u8 algorithm;
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__u8 nr_blocks;
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__u8 nr_redundant;
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__u8 csum_granularity_bits;
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__u8 csum_type;
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/*
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* XXX: targets should be 16 bits - fix this if we ever do a stripe_v2
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*
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* we can manage with this because this only needs to point to a
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* disk label, not a target:
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*/
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__u8 disk_label;
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/*
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* Variable length sections:
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* - Pointers
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* - Checksums
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* 2D array of [stripe block/device][csum block], with checksum block
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* size given by csum_granularity_bits
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* - Block sector counts: per-block array of u16s
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*
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* XXX:
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* Either checksums should have come last, or we should have included a
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* checksum_size field (the size in bytes of the checksum itself, not
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* the blocksize the checksum covers).
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*
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* Currently we aren't able to access the block sector counts if the
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* checksum type is unknown.
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*/
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struct bch_extent_ptr ptrs[];
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} __packed __aligned(8);
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#endif /* _BCACHEFS_EC_FORMAT_H */
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