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e9756dd29f
We're going to be speeding up snapshot deletion, by only having it process the extents/dirents/xattrs btrees if an inode of a given snapshot ID was present. This raises the possibility of 'bkey_in_missing_snapshot' errors popping up, if we ever accidentally don't do the corresponding inode update, or if the new algorithm has bugs. So instead of deleting snapshot IDs, add a new deleted flag, so that 'key in missing snapshot' errors can more definitively tell what happened and automatically repair. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
36 lines
1 KiB
C
36 lines
1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_SNAPSHOT_FORMAT_H
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#define _BCACHEFS_SNAPSHOT_FORMAT_H
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struct bch_snapshot {
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struct bch_val v;
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__le32 flags;
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__le32 parent;
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__le32 children[2];
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__le32 subvol;
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/* corresponds to a bch_snapshot_tree in BTREE_ID_snapshot_trees */
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__le32 tree;
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__le32 depth;
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__le32 skip[3];
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bch_le128 btime;
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};
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LE32_BITMASK(BCH_SNAPSHOT_WILL_DELETE, struct bch_snapshot, flags, 0, 1)
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/* True if a subvolume points to this snapshot node: */
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LE32_BITMASK(BCH_SNAPSHOT_SUBVOL, struct bch_snapshot, flags, 1, 2)
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LE32_BITMASK(BCH_SNAPSHOT_DELETED, struct bch_snapshot, flags, 2, 3)
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/*
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* Snapshot trees:
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*
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* The snapshot_trees btree gives us persistent indentifier for each tree of
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* bch_snapshot nodes, and allow us to record and easily find the root/master
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* subvolume that other snapshots were created from:
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*/
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struct bch_snapshot_tree {
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struct bch_val v;
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__le32 master_subvol;
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__le32 root_snapshot;
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};
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#endif /* _BCACHEFS_SNAPSHOT_FORMAT_H */
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