bcachefs: fix O(n^2) issue with whiteouts in journal keys

Browse source

The journal_keys array can't be substantially modified after we go RW,
because lookups need to be able to check it locklessly - thus we're
limited on what we can do when a key in the journal has been
overwritten.

This is a problem when there's many overwrites to skip over for peek()
operations. To fix this, add tracking of ranges of overwrites: we create
a range entry when there's more than one contiguous whiteout.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

...

This commit is contained in:

Kent Overstreet 2024-11-17 02:23:24 -05:00

parent 854724d116

commit eae6c4a625

5 changed files with 179 additions and 41 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

23

fs/bcachefs/bcachefs.h

View file

156

fs/bcachefs/btree_journal_iter.c

View file

2

fs/bcachefs/btree_journal_iter.h

View file

36

fs/bcachefs/btree_journal_iter_types.h

View file

3

fs/bcachefs/super.c

View file