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bcachefs: Start using bpos.snapshot field

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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>
This commit is contained in:
Kent Overstreet
2021-03-24 18:02:16 -04:00
committed by Kent Overstreet
parent 4cf91b0270
commit e751c01a8e
22 changed files with 252 additions and 74 deletions
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6
fs/bcachefs/debug.c
View File

@@ -222,7 +222,9 @@ static ssize_t bch2_read_btree(struct file *file, char __user *buf,
bch2_trans_init(&trans, i->c, 0, 0);
iter = bch2_trans_get_iter(&trans, i->id, i->from, BTREE_ITER_PREFETCH);
iter = bch2_trans_get_iter(&trans, i->id, i->from,
BTREE_ITER_PREFETCH|
BTREE_ITER_ALL_SNAPSHOTS);
k = bch2_btree_iter_peek(iter);
while (k.k && !(err = bkey_err(k))) {
@@ -290,7 +292,7 @@ static ssize_t bch2_read_btree_formats(struct file *file, char __user *buf,
* all nodes, meh
*/
i->from = bpos_cmp(POS_MAX, b->key.k.p)
? bkey_successor(b->key.k.p)
? bpos_successor(b->key.k.p)
: b->key.k.p;
if (!i->size)