bcachefs: Avoid write lock on mark_lock

Browse source

mark_lock is a frequently taken lock, and there's also potential for
deadlocks since currently bch2_clear_page_bits which is called from
memory reclaim has to take it to drop disk reservations.

The disk reservation get path takes it when it recalculates the number
of sectors known to be available, but it's not really needed for
consistency.  We just want to make sure we only have one thread updating
the sectors_available count, which we can do with a dedicated mutex.

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

...

This commit is contained in:

Kent Overstreet 2020-12-03 14:17:33 -05:00 • committed by Kent Overstreet

parent 33eb63e575

commit fca1223ccf

3 changed files with 8 additions and 11 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

1

fs/bcachefs/bcachefs.h

View file

16

fs/bcachefs/buckets.c

View file

2

fs/bcachefs/super.c

View file