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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2021-03-25 01:02:16 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-23 00:08:57 +0300 |
| commit | e751c01a8ee1ca934cc0953e2e77ad4ea3e64d5e (patch) | |
| tree | 9930602caa160b05f2e62925c86192ae1ab9bc31 /fs/bcachefs/btree_io.h | |
| parent | 4cf91b0270dc16a6637db4c200c7fb745b941065 (diff) | |
| download | linux-e751c01a8ee1ca934cc0953e2e77ad4ea3e64d5e.tar.xz | |
bcachefs: Start using bpos.snapshot field
This patch starts treating the bpos.snapshot field like part of the key
in the btree code:
* bpos_successor() and bpos_predecessor() now include the snapshot field
* Keys in btrees that will be using snapshots (extents, inodes, dirents
and xattrs) now always have their snapshot field set to U32_MAX
The btree iterator code gets a new flag, BTREE_ITER_ALL_SNAPSHOTS, that
determines whether we're iterating over keys in all snapshots or not -
internally, this controlls whether bkey_(successor|predecessor)
increment/decrement the snapshot field, or only the higher bits of the
key.
We add a new member to struct btree_iter, iter->snapshot: when
BTREE_ITER_ALL_SNAPSHOTS is not set, iter->pos.snapshot should always
equal iter->snapshot, which will be 0 for btrees that don't use
snapshots, and alsways U32_MAX for btrees that will use snapshots
(until we enable snapshot creation).
This patch also introduces a new metadata version number, and compat
code for reading from/writing to older versions - this isn't a forced
upgrade (yet).
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/btree_io.h')
| -rw-r--r-- | fs/bcachefs/btree_io.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/fs/bcachefs/btree_io.h b/fs/bcachefs/btree_io.h index f155a6cc1755..9c14cd30a09e 100644 --- a/fs/bcachefs/btree_io.h +++ b/fs/bcachefs/btree_io.h @@ -189,8 +189,8 @@ void bch2_btree_flush_all_writes(struct bch_fs *); void bch2_dirty_btree_nodes_to_text(struct printbuf *, struct bch_fs *); static inline void compat_bformat(unsigned level, enum btree_id btree_id, - unsigned version, unsigned big_endian, - int write, struct bkey_format *f) + unsigned version, unsigned big_endian, + int write, struct bkey_format *f) { if (version < bcachefs_metadata_version_inode_btree_change && btree_id == BTREE_ID_inodes) { @@ -199,6 +199,16 @@ static inline void compat_bformat(unsigned level, enum btree_id btree_id, swap(f->field_offset[BKEY_FIELD_INODE], f->field_offset[BKEY_FIELD_OFFSET]); } + + if (version < bcachefs_metadata_version_snapshot && + (level || btree_type_has_snapshots(btree_id))) { + u64 max_packed = + ~(~0ULL << f->bits_per_field[BKEY_FIELD_SNAPSHOT]); + + f->field_offset[BKEY_FIELD_SNAPSHOT] = write + ? 0 + : U32_MAX - max_packed; + } } static inline void compat_bpos(unsigned level, enum btree_id btree_id, @@ -222,16 +232,24 @@ static inline void compat_btree_node(unsigned level, enum btree_id btree_id, btree_node_type_is_extents(btree_id) && bpos_cmp(bn->min_key, POS_MIN) && write) - bn->min_key = bkey_predecessor(bn->min_key); + bn->min_key = bpos_nosnap_predecessor(bn->min_key); + + if (version < bcachefs_metadata_version_snapshot && + write) + bn->max_key.snapshot = 0; compat_bpos(level, btree_id, version, big_endian, write, &bn->min_key); compat_bpos(level, btree_id, version, big_endian, write, &bn->max_key); + if (version < bcachefs_metadata_version_snapshot && + !write) + bn->max_key.snapshot = U32_MAX; + if (version < bcachefs_metadata_version_inode_btree_change && btree_node_type_is_extents(btree_id) && bpos_cmp(bn->min_key, POS_MIN) && !write) - bn->min_key = bkey_successor(bn->min_key); + bn->min_key = bpos_nosnap_successor(bn->min_key); } #endif /* _BCACHEFS_BTREE_IO_H */ |