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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-12-29 23:25:07 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-01-01 19:47:07 +0300 |
| commit | 84f1638795da1ff2084597de4251e9054f1ad728 (patch) | |
| tree | e3624d44235472e8d3e170af4a53686cfa5a945f /fs/bcachefs/bcachefs_format.h | |
| parent | 8b16413cda7c46d47f8071165b3071f8a9369199 (diff) | |
| download | linux-84f1638795da1ff2084597de4251e9054f1ad728.tar.xz | |
bcachefs: bch_sb_field_downgrade
Add a new superblock section that contains a list of
{ minor version, recovery passes, errors_to_fix }
that is - a list of recovery passes that must be run when downgrading
past a given version, and a list of errors to silently fix.
The upcoming disk accounting rewrite is not going to be fully
compatible: we're going to have to regenerate accounting both when
upgrading to the new version, and also from downgrading from the new
version, since the new method of doing disk space accounting is a
completely different architecture based on deltas, and synchronizing
them for every jounal entry write to maintain compatibility is going to
be too expensive and impractical.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/bcachefs_format.h')
| -rw-r--r-- | fs/bcachefs/bcachefs_format.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/bcachefs/bcachefs_format.h b/fs/bcachefs/bcachefs_format.h index bd5af516994a..fe78e87603fc 100644 --- a/fs/bcachefs/bcachefs_format.h +++ b/fs/bcachefs/bcachefs_format.h @@ -1220,7 +1220,8 @@ struct bch_sb_field { x(counters, 10) \ x(members_v2, 11) \ x(errors, 12) \ - x(ext, 13) + x(ext, 13) \ + x(downgrade, 14) enum bch_sb_field_type { #define x(f, nr) BCH_SB_FIELD_##f = nr, @@ -1638,6 +1639,18 @@ struct bch_sb_field_ext { __le64 errors_silent[8]; }; +struct bch_sb_field_downgrade_entry { + __le16 version; + __le64 recovery_passes[2]; + __le16 nr_errors; + __le16 errors[] __counted_by(nr_errors); +} __packed __aligned(2); + +struct bch_sb_field_downgrade { + struct bch_sb_field field; + struct bch_sb_field_downgrade_entry entries[]; +}; + /* Superblock: */ /* @@ -1651,6 +1664,11 @@ struct bch_sb_field_ext { #define RECOVERY_PASS_ALL_FSCK (1ULL << 63) +/* + * field 1: version name + * field 2: BCH_VERSION(major, minor) + * field 3: recovery passess required on upgrade + */ #define BCH_METADATA_VERSIONS() \ x(bkey_renumber, BCH_VERSION(0, 10), \ RECOVERY_PASS_ALL_FSCK) \ |