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bcachefs: Rework btree iterator lifetimes

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The btree_trans struct needs to memoize/cache btree iterators, so that
on transaction restart we don't have to completely redo btree lookups,
and so that we can do them all at once in the correct order when the
transaction had to restart to avoid a deadlock.

This switches the btree iterator lookups to work based on iterator
position, instead of trying to match them up based on the stack trace.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-09-26 22:21:39 -04:00 • committed by Kent Overstreet
commit 64bc001153
10 changed files with 173 additions and 146 deletions
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