| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _BCACHEFS_SUBVOLUME_FORMAT_H |
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| 3 | #define _BCACHEFS_SUBVOLUME_FORMAT_H |
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| 4 | |
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| 5 | #define SUBVOL_POS_MIN POS(0, 1) |
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| 6 | #define SUBVOL_POS_MAX POS(0, S32_MAX) |
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| 7 | #define BCACHEFS_ROOT_SUBVOL 1 |
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| 8 | |
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| 9 | struct bch_subvolume { |
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| 10 | struct bch_val v; |
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| 11 | __le32 flags; |
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| 12 | __le32 snapshot; |
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| 13 | __le64 inode; |
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| 14 | /* |
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| 15 | * Snapshot subvolumes form a tree, separate from the snapshot nodes |
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| 16 | * tree - if this subvolume is a snapshot, this is the ID of the |
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| 17 | * subvolume it was created from: |
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| 18 | * |
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| 19 | * This is _not_ necessarily the subvolume of the directory containing |
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| 20 | * this subvolume: |
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| 21 | */ |
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| 22 | __le32 creation_parent; |
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| 23 | __le32 fs_path_parent; |
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| 24 | bch_le128 otime; |
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| 25 | }; |
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| 26 | |
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| 27 | LE32_BITMASK(BCH_SUBVOLUME_RO, struct bch_subvolume, flags, 0, 1) |
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| 28 | /* |
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| 29 | * We need to know whether a subvolume is a snapshot so we can know whether we |
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| 30 | * can delete it (or whether it should just be rm -rf'd) |
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| 31 | */ |
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| 32 | LE32_BITMASK(BCH_SUBVOLUME_SNAP, struct bch_subvolume, flags, 1, 2) |
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| 33 | LE32_BITMASK(BCH_SUBVOLUME_UNLINKED, struct bch_subvolume, flags, 2, 3) |
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| 34 | |
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| 35 | #endif /* _BCACHEFS_SUBVOLUME_FORMAT_H */ |
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| 36 | |
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