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bcachefs: Fix another lockdep splat 

vfree() can allocate memory, so we need to call memalloc_nofs_save().

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 2020-10-15 21:48:58 -04:00 committed by Kent Overstreet
parent 505b7a4c28
commit 97c0e19502
1 changed files with 4 additions and 1 deletions
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5
fs/bcachefs/btree_cache.c
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@ -253,7 +253,7 @@ static unsigned long bch2_btree_cache_scan(struct shrinker *shrink,
unsigned long can_free;
unsigned long touched = 0;
unsigned long freed = 0;
unsigned i;
unsigned i, flags;
if (btree_shrinker_disabled(c))
return SHRINK_STOP;
@ -264,6 +264,8 @@ static unsigned long bch2_btree_cache_scan(struct shrinker *shrink,
else if (!mutex_trylock(&bc->lock))
return -1;
flags = memalloc_nofs_save();
/*
* It's _really_ critical that we don't free too many btree nodes - we
* have to always leave ourselves a reserve. The reserve is how we
@ -327,6 +329,7 @@ restart:
clear_btree_node_accessed(b);
}
memalloc_nofs_restore(flags);
mutex_unlock(&bc->lock);
out:
return (unsigned long) freed * btree_pages(c);